JP5069971B2 - Image forming apparatus and management system - Google Patents

Description

  The present invention relates to an image forming apparatus and a management system thereof, and is not particularly limited to this, but forms an electrostatic latent image by projecting image light onto a charged surface of a photoconductor, and develops this to develop an intermediate image. The present invention relates to a management system including a so-called electrophotographic image forming apparatus that transfers to a sheet through a transfer member, and a management apparatus that gives a user advice regarding replacement or replacement of consumables according to the state.

JP 2003-215986 A JP-A-5-164800 JP, 2001-175328, A Several kinds of inventions which predict the occurrence of an abnormality from the status information of the image forming apparatus and achieve the efficiency of service work have been proposed. In the system described in Patent Document 1, an abnormality is predicted based on the number of occurrences of abnormal events. In the diagnosis method and apparatus described in Patent Literature 2, the abnormality occurrence information of the copying machine and the status information at that time are aggregated on a server, and a cause common to a specific abnormality is found by statistical processing. In the system and method described in Patent Document 3, information on sensors, counters, and the like on the copying machine is integrated, and the cause of the abnormality is specified by the copying machine alone.

  In Patent Literature 1, since the information to be collected is specified as the number of occurrences of abnormal events, the types of abnormalities that can be predicted are limited. In the invention described in Patent Document 2, since information obtained from a copying machine is transmitted to a server via a network, the network load increases. In addition, since it is necessary to consolidate the processing for a large number of copiers on the market, it is necessary to prepare a server that can withstand the calculation load, which increases system construction costs. In the invention described in Patent Document 3, the load on the management system side can be reduced in order to perform abnormality sign determination inside the copying machine. However, as a method of abnormality sign determination, a method with a large calculation load such as neural network or Bayesian inference is used. Since it is adopted, the load on the processing device and storage device inside the copying machine increases, and other operations of the copying machine, such as image processing and mechanical control, may cause problems such as delay and speed reduction.

  A first object of the present invention is to provide an image forming apparatus that determines a sign that may lead to an abnormality, and a second object is to provide an image forming apparatus with a small calculation load. A third object is to increase the reliability of determination.

(1) Photoconductor, charging means for charging the photoconductor, exposure means for projecting image light onto the charging surface of the photoconductor, and developing the electrostatic latent image formed on the photoconductor by the exposure means into a toner image Developing means, transfer means for transferring the toner image to the sheet via the intermediate transfer member, a photosensor for detecting the density of the toner image transferred to the intermediate transfer member, and a light sensor projected on the surface of the intermediate transfer member. Light sensor emission intensity adjusting means for setting the light reception level of the reflected light sensor as a reference value, and the toner image density of the test pattern transferred to the intermediate transfer belt is detected by the light sensor and based on the detected value. In an image forming apparatus comprising a toner image density adjusting unit for correcting a developing bias of the developing unit and an exposure amount of the exposing unit ,
State storage means for storing state data including a light emission intensity adjustment value R of the photosensor light emission intensity adjustment means, a development bias adjustment value Q of the toner image density adjustment means, and an exposure adjustment value P ;
The R, respectively Q and P, a plurality of temporally comprises feature extraction means for generating object data representing a transition form of status data of a plurality of points over the last previously, abnormal sign determination for the previous SL state data Target data generating means for generating or extracting seed target data;
First determination means for determining whether or not each target data has an abnormal tendency depending on whether each target data is less than or equal to each reference value set for each target data;
A determination result for the R, Q, and P addressed by the first determining means is attached to the weights set for each target data , and the presence / absence of an abnormality sign for the R, Q, and P as a whole is determined by majority vote. Two discrimination means; and
Means for converting the determination of the presence of the abnormal sign as a whole by the second determining means into data representing a sign of cleaning failure;
An image forming apparatus comprising:

  (2) The target data is either or both of a feature amount generated based on the state data and the state data; The management apparatus for the image forming apparatus according to (1) above.

( 3 ) The image forming apparatus according to (2), further comprising: a notification unit that outputs a notification corresponding to the data representing the sign of cleaning failure .

( 4 ) The image forming apparatus according to any one of (1) to ( 3 ), further including: a first update unit configured to update a reference value addressed to the target data used by the first determination unit.

( 5 ) The image forming apparatus according to any one of (1) to ( 4 ), further including: a second update unit configured to update a weight addressed to the target data used by the second determination unit.

( 6 ) When there is status data to which data indicating that a repaired element of the image forming apparatus has been repaired is included in the plurality of types of status data, the target data generation means generates target data for the status data. The image forming apparatus according to any one of (1) to ( 4 ), wherein the first determining unit determines a determination result addressed to the target data of the state data without an abnormal tendency.

( 7 ) a management device that manages status information of the image forming apparatus; and
A management system including the image forming apparatus according to any one of (1) to ( 6 ), wherein the management apparatus communicates with the management apparatus via a network;
The image forming apparatus transmits the plurality of types of state data, the determination of the presence of an abnormality sign by the second determination unit, and the occurrence of the abnormality to the management apparatus;
The management apparatus accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of an abnormality in a database, and the reference value and weight modified based on the state data in response to the occurrence of the abnormality To the image forming apparatus;
The image forming apparatus updates the set reference value and weight to the received one; a management system.

( 8 ) The management device updates the reference value and weight used by the first and second determination means to the reference value and weight modified based on the status data of the image forming apparatus group of the same model in the database. The management system according to ( 7 ) above.

( 9 ) a management device that manages status information of the image forming apparatus; and
A management system including the image forming apparatus according to any one of (1) to ( 6 ), wherein the management apparatus communicates with the management apparatus via a network;
The image forming apparatus transmits the plurality of types of state data, the determination of the presence of an abnormality sign by the second determination unit, and the occurrence of the abnormality to the management apparatus;
The management device accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of abnormality in a database, and determines the presence / absence of the abnormality sign generated based on the stored adjustment value. Additional first determination means and second determination means are set in the image forming apparatus via the network;
The image forming apparatus also executes determination of presence / absence of an abnormality sign using the set additional first determination unit and second determination unit; a management system.

( 10 ) a management device that manages status information of the image forming apparatus; and
A management system including the image forming apparatus according to any one of (1) to ( 6 ), wherein the management apparatus communicates with the management apparatus via a network;
The image forming apparatus transmits the plurality of types of status data and other status data, determination of presence of abnormality sign of the second determination unit, and occurrence of abnormality to the management device;
The management apparatus accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of an abnormality in a database addressed to the image forming apparatus, and a plurality of types including the accumulated other status data Additional first determination means and second determination means for determining presence / absence of the abnormality sign generated based on the state data are set in the image forming apparatus via the network;
The image forming apparatus also executes determination of presence / absence of an abnormality sign using the set additional first determination unit and second determination unit; a management system.

( 11 ) The management apparatus according to ( 9 ) or ( 10 ), wherein the management apparatus includes an additional first determination unit and a second determination unit based on status data of the image forming apparatus group of the same model in the database. An image forming apparatus management system.

  According to the above (1), the presence / absence of an image density abnormality (color density abnormality in the case of color) due to cleaning failure is determined, that is, whether or not there is a cleaning failure predictor, and data with a cleaning failure predictor is output.

According to the above ( 3 ), since the abnormality sign is notified, it is possible to take measures to prevent the abnormality in advance according to the notification. According to the above ( 4 ), the discrimination criterion used by the first discrimination means can be adjusted by the first update means. According to (5) above, the weight used by the second discriminating unit can be adjusted by the second updating unit.

According to the above ( 7 ), the management unit can improve the presence / absence determination of an abnormality sign of the image forming apparatus based on the newly updated new adjustment value. According to the above ( 8 ), since the state of the same model, the information with the sign of abnormality and the abnormality information are accumulated in the management unit early, a large amount of correction of the reference value and the weight value is performed based on these. Can be done with reliability. According to the above ( 9 ), the management unit adds a new abnormality sign presence / absence determination based on the newly updated new adjustment value to the image forming apparatus and executes the abnormality sign in parallel on the image forming apparatus. The reliability of the determination can be improved. According to the above ( 10 ), when the abnormality that has occurred is not detected by the presence / absence determination of the existing abnormality sign by the management means, the adjustment value of the control parameter related to the abnormality on the database and Since the additional first determination means and second determination means for determining presence / absence of the abnormality sign generated based on the state value including the state detection value are set in the image forming apparatus, the abnormality is thereafter performed. It is possible to determine a sign of the abnormality before this occurs. It is possible to deal with an unknown abnormality and improve the discrimination accuracy. Can handle multiple abnormalities. According to the above ( 11 ), since the state data of the same model, the information having an abnormality sign, and the abnormality information are accumulated in the management unit in an early stage, based on these, the additional first determination unit and the second determination unit Generation can be performed early and with high reliability.

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

  FIG. 1 shows an example of a copier management system including a multi-function copier 601 according to the first embodiment of the present invention. A copier 601 that is an image forming apparatus and copiers 602 to 605 having functions equivalent to the copier 601 are connected by a LAN 600 and connected to a management apparatus 630 outside the LAN via the Internet 620 that is a network. Each copying machine has a built-in abnormality sign determination system including a feature extraction unit, a first determination unit, and a second determination unit. And when there is an abnormality sign determination instruction from the operation board 500 or the management device 630), the abnormality sign determination system operates. When the abnormality sign determination system determines that an abnormality is close (there is an abnormality sign), the fact is notified to the management device 630 via the network (LAN, server 610 and the Internet).

  In the management apparatus 630 that has received the abnormality sign determination result, the operator contacts the service center in the area in charge and orders parts if necessary. If the predicted abnormality can be dealt with by the user, the administrator of the copier 601 is informed of the fact and requested to deal with it. The result of the determination that there is an abnormal sign in the abnormal sign determination system is displayed on the display of the copying machine. The user can check and cope with this display correspondence by opening the copying machine operation manual or the electronic manual built in the operation board 500.

  FIG. 2 shows an outline of the mechanism of the copying machine 601. The copying machine 601 includes an image forming unit including a printer 100 and a paper feeding unit 200, a scanner 300, and an ADF (automatic document feeder) 400. The scanner 300 is attached on the printer 100, and the ADF 400 is attached on the scanner 300. The scanner 300 reads image information of a document placed on the contact glass 32 by a reading sensor (CCD in the present embodiment) 36, and reads the read image information (Image Processing Processor; hereinafter) of the engine control 510 (FIG. 8). Then simply send it to IPP). The engine control 510 controls the four drum-shaped photoreceptors 40 (K, Y, and K) by controlling lasers and LEDs (not shown) disposed in the exposure device 21 of the printer 100 based on image information received from the scanner 300. M, C: Laser writing light L (FIG. 4) is irradiated toward FIG. 3). By this irradiation, an electrostatic latent image is formed on the surface of the photoreceptor 40 (K, Y, M, C), and this latent image is developed into a toner image via a predetermined development process. Note that the subscripts K, Y, M, and C added after the reference numerals indicate specifications for black, yellow, magenta, and cyan.

  The printer 100 includes an exposure device 21 as an exposure unit, a primary transfer roller 62 (K, Y, M, and C) as a transfer unit, a secondary transfer device 22, a fixing device 25, a paper discharge device, and a toner (not shown). A supply device, a toner disposal device, and the like are also provided. The paper feeding unit 200 includes an automatic paper feeding unit disposed below the printer 100 and a manual feeding unit disposed on a side surface of the printer 100. The automatic paper feed unit separates the three paper feed cassettes 44 arranged in multiple stages in the paper bank 43, the paper feed roller 42 that feeds transfer paper as a recording medium from the paper feed cassette, and the fed transfer paper. A separation roller 45 and the like are sent to the paper feed path 46. Further, it also includes a transport roller 47 that transports the transfer paper to the paper feed path 48 of the printer 100. On the other hand, the manual feed section includes a manual feed tray 51 and a separation roller 52 that separates the transfer paper on the manual feed tray 51 one by one toward the manual feed path 53.

  A registration roller pair 49 is disposed near the end of the paper feed path 48 of the printer 100. The registration roller pair 49 is formed between the intermediate transfer belt 10 serving as an intermediate transfer body and the secondary transfer device 22 at a predetermined timing after receiving the transfer paper sent from the paper feed cassette 44 or the manual feed tray 51. To the secondary transfer nip.

  In this copying machine, an operator sets a document on the document table 30 of the ADF 400 when copying a color image. Alternatively, after the ADF 400 is opened and a document is set on the contact glass 32 of the scanner 300, the ADF 400 is closed and the document is pressed. Then, a start switch (not shown) is pressed. Then, when a document is set on the ADF 400, the scanner 300 starts driving immediately after the document is conveyed on the contact glass 32 and then when the document is set on the contact glass 32. Then, the first carriage 33 and the second carriage 34 travel, and the light emitted from the light source of the first carriage 33 is reflected by the document surface and then travels toward the second carriage 34. Further, after being reflected by the mirror of the second carriage 34, it reaches the reading sensor 36 via the imaging lens 35 and is read as image information.

  When the image information is read in this way, the printer 100 rotates the other two support rollers while rotating one of the support rollers 14, 15, and 16 with a drive motor (not shown). Then, the intermediate transfer belt 10 that is an intermediate transfer member stretched around these rollers is moved endlessly. Further, laser writing as described above and a development process described later are performed. Then, while rotating the photoreceptors 40 (K, Y, M, C), black, yellow, magenta, and cyan monochrome images are formed on them. These are electrostatically transferred in four colors at the primary transfer nips for K, Y, M, and C where the photosensitive member 40 (K, Y, M, and C) and the intermediate transfer belt 10 come into contact with each other, and are four colors. A superimposed toner image is obtained. A toner image is formed on the photoreceptor 40 (K, Y, M, C).

  On the other hand, the paper feed unit 200 operates one of the three paper feed rollers to feed transfer paper of a size corresponding to the image information, and feeds the transfer paper to the paper feed path 48 of the printer 100. Lead to. The transfer sheet, which is a sheet of paper that has entered the paper feed path 48, is sandwiched between the registration roller pair 49 and temporarily stops. Then, the intermediate transfer belt 10 and the secondary transfer roller 23 of the secondary transfer device 22 are matched in time. To the secondary transfer nip which is a contact portion. Then, in the secondary transfer nip, the four-color superimposed toner image on the intermediate transfer belt 10 and the transfer paper are brought into close contact in synchronization. Then, the four-color superimposed toner image is secondarily transferred onto the transfer paper due to the influence of the transfer electric field formed at the nip, the nip pressure, etc., and becomes a full color image combined with the white color of the paper.

  The transfer paper that has passed through the secondary transfer nip is fed into the fixing device 25 by the endless movement of the transport belt 24 of the secondary transfer device 22. Then, after the full color image is fixed by the action of the pressure applied by the pressure roller 27 of the fixing device 25 and the heating by the heating belt, the paper is discharged onto the discharge tray 57 provided on the side surface of the printer 100 via the discharge roller 56. To be discharged.

  FIG. 3 shows an enlarged view around the transfer belt 10 of the printer 100. The printer 100 includes a belt unit, four process units 18 (K, Y, M, and C) that form toner images of respective colors, a secondary transfer device 22, a belt cleaning device 17, a fixing device 25, and the like. The belt unit moves the intermediate transfer belt 10 stretched around a plurality of rollers endlessly while contacting the photoreceptor 40 (K, Y, M, C). In the primary transfer nip for K, Y, M, and C where the photoreceptor 40 (K, Y, M, and C) and the intermediate transfer belt 10 are in contact, the primary transfer roller 62 (K, Y, M, and C). ), The intermediate transfer belt 10 is pressed from the back side toward the photoconductor 40 (K, Y, M, C). A primary transfer bias is applied to the primary transfer rollers 62 (K, Y, M, and C) by a power source (not shown). Thus, the primary transfer nip for the K, Y, M, and C primary transfer that electrostatically moves the toner image on the photoreceptor 40 (K, Y, M, and C) toward the intermediate transfer belt 10. An electric field is formed. Between each primary transfer roller 62 (K, Y, M, C), a conductive roller 74 (K, Y, M, C) that contacts the back surface of the intermediate transfer belt 10 is disposed. These conductive rollers 74 are adjacent to each other via the intermediate resistance base layer 11 on the back side of the intermediate transfer belt 10, with the primary transfer bias applied to the primary transfer rollers 62 (K, Y, M, C). It prevents it from flowing into the process unit.

  The process unit (18K, Y, M, C) supports the photosensitive member (40K, Y, M, C) and several other devices as a single unit on a common support. It can be attached to and detached from 100. Taking the process unit 18 (K) for black as an example, this is a developing unit 61 as developing means for developing an electrostatic latent image formed on the surface of the photoreceptor 40K into a black toner image in addition to the photoreceptor 40K. (K). In addition, a photoreceptor cleaning device 63 (K) that cleans transfer residual toner adhering to the surface of the photoreceptor 40 (K) after passing through the primary transfer nip is also provided. In addition, a static elimination device (not shown) that neutralizes the surface of the photoreceptor 40 (K) after cleaning, a charging device that is a charging means (not shown) that uniformly charges the surface of the photoreceptor 40 (K) after static elimination, and the like are also provided. Yes. The process units 18 (Y, M, C) for other colors have almost the same configuration except that the color of the toner to be handled is different. This copying machine has a so-called tandem type configuration in which these four process units 18 (K, Y, M, C) are arranged so as to face the intermediate transfer belt 10 along the endless movement direction. ing.

  FIG. 4 shows an enlarged unit configuration common to the four process units 18 (K, Y, M, C). That is, each of the four process units 18 (K, Y, M, C) has the configuration shown in FIG. As shown in the drawing, the process unit 18 includes a charging device 60 as a charging unit, a developing device 61 as a developing unit, a primary transfer roller 62 as a primary transfer unit, and a photoconductor cleaning around a photoconductor 40. The apparatus 63, the static elimination apparatus 64, etc. are provided. As the photosensitive member 40, a drum-shaped member is used in which a photosensitive organic layer is applied to a base tube made of aluminum or the like to form a photosensitive layer. However, an endless belt may be used. Further, as the charging device 60, a charging device that rotates a charging roller 60 to which a charging bias is applied while contacting the photoreceptor 40 is used. A scorotron charger or the like that performs a non-contact charging process on the photoreceptor 40 may be used.

  The developing device 61 develops a latent image using a two-component developer containing a magnetic carrier and a nonmagnetic toner. An agitating unit 66 that conveys the two-component developer accommodated in the inside while agitating and supplies the developer sleeve 65 to the developing sleeve 65, and development that transfers toner of the two-component developer attached to the developing sleeve 65 to the photoreceptor 40. Part 67.

  The stirring unit 66 is provided at a position lower than the developing unit 67, and is provided on the bottom surface of the two screws 68 arranged in parallel to each other, the partition plate 69 provided between the screws, and the developing case 70. A toner density sensor 71 and the like are included.

  The developing unit 67 includes a developing sleeve 65 that faces the photoreceptor 40 through the opening of the developing case 70, a magnet roller 72 that is non-rotatably provided inside the developing sleeve 65, a doctor blade 73 that approaches the developing sleeve 65, and the like. ing. The distance at the closest portion between the doctor blade 73 and the developing sleeve 65 is set to about 500 [μm]. The developing sleeve 65 has a non-magnetic rotatable cylindrical shape. Further, the magnet roller 72 which is prevented from being rotated with the developing sleeve 65 has, for example, five magnetic poles N1, S1, N2, S2 and S3 in the rotation direction of the developing sleeve 65 from the position of the doctor blade 73. ing. Each of these magnetic poles applies a magnetic force to the two-component developer on the sleeve at a predetermined position in the rotational direction. As a result, the two-component developer sent from the stirring unit 66 is attracted and carried on the surface of the developing sleeve 65, and a magnetic brush is formed along the magnetic field lines on the sleeve surface.

  The magnetic brush is regulated to an appropriate layer thickness when passing through the position facing the doctor blade 73 as the developing sleeve 65 rotates, and then conveyed to the developing area facing the photoreceptor 40. Then, due to the potential difference between the developing bias applied to the developing sleeve 65 and the electrostatic latent image on the photoreceptor 40, it is transferred onto the electrostatic latent image and contributes to development. Further, as the developing sleeve 65 rotates, the developing sleeve 65 returns to the developing portion 67 again, and after being separated from the sleeve surface due to the influence of the repulsive magnetic field between the magnetic poles of the magnet roller 72, the developing sleeve 65 is returned to the stirring portion 66. In the stirring unit 66, an appropriate amount of toner is supplied to the two-component developer based on the detection result by the toner density sensor 71. The developing device 61 may employ a one-component developer that does not include a magnetic carrier, instead of the one that uses a two-component developer.

  As the photoconductor cleaning device 63, a system in which a cleaning blade 75 made of polyurethane rubber is pressed against the photoconductor 40 is used, but another system may be used. In order to improve the cleaning property, in this example, a cleaning device 63 having a contact conductive fur brush 76 whose outer peripheral surface is in contact with the photoreceptor 40 is rotatable in the direction of the arrow in the figure. A metal electric field roller 77 for applying a bias to the fur brush 76 is provided so as to be rotatable in the direction of the arrow in the figure, and the tip of the scraper 78 is pressed against the electric field roller 77. The toner removed from the electric field roller 77 by the scraper 78 falls on the collection screw 79 and is collected.

  The photoconductor cleaning device 63 having such a configuration removes residual toner on the photoconductor 40 with a fur brush 76 that rotates counterclockwise with respect to the photoconductor 40. The toner adhering to the fur brush 76 is removed by the electric field roller 77 to which a bias that rotates in contact with the fur brush 76 in the counter direction is applied. The toner adhering to the electric field roller 77 is cleaned by the scraper 78. The toner recovered by the photoconductor cleaning device 63 is brought to one side of the photoconductor cleaning device 63 by the recovery screw 79 and returned to the developing device 61 by the toner recycling device 80 for reuse. The static eliminator 64 includes a static elimination lamp or the like, and removes the surface potential of the photoreceptor 40 by irradiating light. The surface of the photoreceptor 40 thus neutralized is uniformly charged by the charging device 60 and then subjected to optical writing processing.

  Referring to FIG. 3 again, a secondary transfer device 22 is provided below the belt unit in the drawing. In the secondary transfer device 22, a secondary transfer belt 24 is stretched between two rollers 23 and moved endlessly. One of the two rollers 23 is a secondary transfer roller to which a secondary transfer bias is applied by a power source (not shown), and the intermediate transfer belt 10 and the secondary transfer belt 24 are between the roller 16 of the belt unit. Is sandwiched. Thus, a secondary transfer nip is formed in which both belts move in the same direction at the contact portion while contacting. On the transfer paper fed from the registration roller pair 49 to the secondary transfer nip, the four-color superimposed toner image on the intermediate transfer belt 10 is secondarily transferred collectively under the influence of the secondary transfer electric field and the nip pressure, so that full color is obtained. An image is formed. The transfer sheet that has passed through the secondary transfer nip is separated from the intermediate transfer belt 10 and is conveyed to the fixing device 25 along with the endless movement of the belt while being held on the surface of the secondary transfer belt 24. Instead of the secondary transfer roller, secondary transfer may be performed by a transfer charger or the like.

  The surface of the intermediate transfer belt 10 that has passed through the secondary transfer nip approaches a support position by the support roller 15. Here, the intermediate transfer belt 10 is sandwiched between a belt cleaning device 17 that contacts the front surface (loop outer surface) and a support roller 15 that contacts the back surface. Then, after the transfer residual toner adhering to the front surface is removed by the belt cleaning device 17, it sequentially enters the primary transfer nip for K, Y, M, and C, and the next four-color toner The images are superimposed.

  The belt cleaning device 17 has two fur brushes 90 and 91. By rotating a plurality of raised brushes in contact with the intermediate transfer belt 10 in a counter direction with respect to the flocking direction, the transfer residual toner on the belt is mechanically scraped off. In addition, a cleaning bias is applied by a power source (not shown) to electrostatically attract and recover the scraped transfer residual toner.

  With respect to the fur brushes 90 and 91, the metal rollers 92 and 93 are rotating in the forward or reverse direction while being in contact with each other. Among these metal rollers 92 and 93, a negative polarity voltage is applied to the metal roller 92 located on the upstream side in the rotation direction of the intermediate transfer belt 10 by the power source 94. Further, a positive polarity voltage is applied to the metal roller 93 located on the downstream side by the power source 95. The tips of the blades 96 and 97 are in contact with the metal rollers 92 and 93, respectively. In such a configuration, the upstream fur brush 90 first cleans the surface of the intermediate transfer belt 10 with the endless movement of the intermediate transfer belt 10 in the direction of the arrow in the drawing. At this time, for example, when −400 [V] is applied to the fur brush 90 while −700 [V] is applied to the metal roller 92, first, the positive polarity toner on the intermediate transfer belt 10 is moved to the fur brush 90 side. Electrostatic transfer to The toner transferred to the fur brush side is further transferred from the fur brush 90 to the metal roller 92 due to a potential difference, and is scraped off by the blade 96.

  As described above, the toner on the intermediate transfer belt 10 is removed by the fur brush 90, but a lot of toner still remains on the intermediate transfer belt 10. These toners are negatively charged by a negative polarity bias applied to the fur brush 90. This is considered to be charged by charge injection or discharge. Next, by using the fur brush 91 on the downstream side to apply a positive polarity bias and perform cleaning, the toner can be removed. The removed toner is transferred from the fur brush 91 to the metal roller 93 due to a potential difference and scraped off by the blade 97. The toner scraped off by the blades 96 and 97 is collected in a tank (not shown).

  Most of the toner is removed from the surface of the intermediate transfer belt 10 after being cleaned by the fur brush 91, but a little toner is still left. The toner remaining on the intermediate transfer belt 10 is charged with a positive polarity by a positive polarity bias applied to the fur brush 91 as described above. Then, it is transferred to the photoconductors 40K, Y, M, and C by the transfer electric field applied at the primary transfer position, and is collected by the photoconductor cleaning device 63.

  In general, the registration roller pair 49 is often used while being grounded, but it is also possible to apply a bias for removing paper dust from the transfer paper fed to the registration roller pair 49.

  Under the secondary transfer device 22 and the fixing device 25, a transfer paper reversing device 28 (see FIG. 2) is provided so as to extend in parallel with the tandem portion 20 described above. As a result, the transfer paper that has undergone the image fixing process on one side is switched by the switching claw to the transfer paper path to the transfer paper reversing device side, where it is reversed and enters the transfer nip for secondary transfer again. Then, after the secondary transfer process and the fixing process of the image are performed on the other side, the sheet is discharged onto a discharge tray.

  The optical sensors 81 and 82 are opposed to the intermediate transfer belt 10 at the portion of the support roller 14. These optical sensors 81 and 82 are opposed to both end portions of the belt 10 as shown in FIG. When toner image density detection and toner image density adjustment are performed, test marks (test pattern images) of five levels (C, M, Y, Bk) of each color (C, M, Y, Bk) are sequentially formed on both end portions of the transfer belt 10. These densities (toner amounts) are detected by the optical sensors 81 and 82. FIG. 5B shows cyan (C) test patterns 83C1 and 83C2 and magenta (M) test patterns 83M1 and 83M2 formed on the intermediate transfer belt 10. FIG.

  FIG. 6A shows the structure of the optical sensor 81. The optical sensor 81 includes an LED (light emitting diode) that projects light obliquely toward the belt 10, a regular reflection PD (photodiode) that receives regular reflection light from the belt 10, and a diffuse reflection PD that receives irregular reflection light from the belt 10. There is. The structure of the optical sensor 82 is the same as that of 81. The intermediate transfer belt 10 is usually made of a material having extremely high smoothness in order to avoid toner sticking. For example, a belt material having a glossy surface such as PVDF or polyimide.

  In the toner image density adjustment, the light emission intensity adjustment is performed to adjust the energization current value of the LEDs of the photosensors 81 and 82 so that the reflected light amount of the intermediate transfer belt 10 becomes the reference value (target received light amount in FIG. 6B). (Adjustment value R) and development bias correction (adjustment value Q) and exposure correction (adjustment value P) for matching the development potential vs. toner image density characteristic line to the reference characteristic line are performed. The developing potential is the difference between the photoreceptor surface potential and the developing roller potential. The light emission intensity adjustment is performed by using the light reception signal of the regular reflection PD in the optical sensor, and the light reception amount of the optical sensor due to individual differences in LED light emission efficiency, fluctuations in received light due to temperature fluctuations and temporal fluctuations, and contamination of the surface of the intermediate transfer belt 10 Is adjusted to adjust the received light amount of the optical sensors 81 and 82 to the target received light amount shown in FIG.

  In toner density adjustment including development bias correction (adjustment value Q) and exposure correction (adjustment value P), a test pattern (toner image: for example, (a) in FIG. 5 is formed on the intermediate transfer belt 10 for each color. ) 83C1 etc.) and their concentrations are detected by the optical sensors 81 and 82.

  FIG. 7A shows a state in which the toner image of one mark of the test pattern passes directly under the optical sensor 81. When the toner image of the test pattern comes to the opposing position, the detection signal of the irregular reflection PD of the optical sensor 81 that mainly receives irregular reflection light of the toner image is subjected to irregular reflection light reception data by A / D conversion by the CPU 517 (FIG. 8). The irregular reflection light reception data from the LUT (Look Up Table) for converting the reflection PD output into the toner density, which is created based on the characteristics of the toner density versus the irregular reflection PD output shown in FIG. Is converted into toner density data corresponding to. That is, the irregular reflection light reception data is converted into toner density data.

  Since each color toner contains a colorant of each color, a near-infrared or infrared light source having a wavelength of about 840 nm that is not significantly affected by the colorant is used as the LED light source of the optical sensors 81 and 82. . However, a toner colored with low-cost carbon black is generally used as the black toner, and exhibits a strong light absorption even in the infrared region. Therefore, as shown in FIG. Sensitivity to is reduced.

  FIG. 8 shows the system configuration of the electrical system of the multifunction copying machine 601 shown in FIG. The electrical system communicates with the outside using a system controller 501 that performs overall control of the image forming apparatus, an operation board 500 of the image forming apparatus connected to the controller 501, an HDD 503 that stores image data, and an analog line. Communication control device interface board 504, LAN interface board 505, FAX control unit 506, IEEE1394 board, wireless LAN board, USB board, etc. 507 connected to a general-purpose PIC bus, and engine control 510 connected to the controller by PCI bus , An I / O control board 513 for controlling I / O of the image forming apparatus, a scanner board (SBU: Sensor Board Unit) 511 for reading a copy original (image), and image data connected to the engine control 510 Is the table Projecting the to image light onto a photosensitive drum (light writing) LDB composed (laser diode board) 512 and the like. The communication control device interface board 504 immediately notifies an external remote diagnosis device when a failure occurs in the device, and allows a serviceman to recognize the contents and situation of the abnormal part and repair it immediately. . In addition, it is also used for sending out the usage status of the device.

  A scanner 300 that optically reads an original scans the original with an original illumination light source, and forms an original image on the CCD 36. The original image, that is, the reflected light of light irradiation on the original is photoelectrically converted by the CCD 36 to generate R, G, B image signals. The CCD 36 is a three-line color CCD that generates R, G, and B image signals of EVENch (even pixel channel) / ODDch (odd pixel channel) and uses it as an analog ASIC (Application Specific IC) of SBU (sensor board unit). input. The SBU 511 includes an analog ASIC and a circuit for generating drive timings for the CCD and analog ASIC. The output of the CCD 36 is sampled and held by a sample and hold circuit inside the analog ASIC, then A / D converted, converted into R, G and B image data, shading corrected, and output I / F (interface) At 520, the data is sent to the image data processor IPP via the image data bus.

  IPP is a programmable arithmetic processing means that performs image processing, separation generation (determination of whether an image is a character area or a photographic area: image area separation), background removal, scanner gamma conversion, filter, color correction, scaling, and image processing. , Perform printer gamma conversion and gradation processing. The image data transferred from the SBU 511 to the IPP is corrected for signal degradation (signal degradation of the scanner system) accompanying quantization into an optical system and a digital signal by the IPP, and is written in the frame memory 521.

  The system controller 501 includes a ROM that controls the CPU and the system controller board, a RAM that is a working memory used by the CPU, a lithium battery, an NV-RAM that includes a RAM backup and a clock, and a system controller board. The system bus control, frame memory control, FIFO, and other ASICs for controlling the CPU periphery and their interface circuits are mounted.

  A system controller 501 has functions of a plurality of applications such as a scanner application, a facsimile application, a printer application, and a copy application, and controls the entire system. The input of the operation board 500 is decoded, and the setting of the system and the contents of the state are displayed on the display unit of the operation board 500. Many units are connected to the PCI bus, and image data and control commands are transferred in a time division manner by the image data bus / control command bus.

  The communication control device interface board 504 is a communication interface board between the communication control device and the controller 501. Communication with the controller 501 is connected by full-duplex asynchronous serial communication. The communication control device 522 is multi-drop connected according to the RS-485 interface standard. Communication with the remote management device 630 is performed via the communication controller device interface board 504.

  The LAN interface board 505 is a communication interface board between the in-house LAN and the controller 501 connected to the in-house LAN 600 (FIG. 1), and is equipped with a PHY chip. The LAN interface board 505 and the controller 501 are connected by standard communication interfaces of a PHY chip I / F and an I2C bus I / F. Communication with an external device is performed via the LAN interface board 505.

  The HDD 503 is used as an application database that stores system application programs and device activation information of printers and image forming process devices, and an image database that stores image data of read images and written images, that is, image data and document data. . Both the physical interface and the electrical interface are connected to the controller through an interface conforming to ATA / ATAPI-4.

  An abnormal sign determination PAD (FIG. 13) program (feature amount extraction means, first determination means, and second determination means) and a sign determination reference data table (FIG. 18), which will be described later, are stored in the HDD 503. When the abnormality sign determination is executed, it is read from the HDD 503, written in the RAM of the engine control 510, and executed by the CPU of the engine control 510.

  The operation board 500 is equipped with a CPU, ROM, RAM, LCD, and ASIC (LCDC) for controlling key input. In the ROM, a control program for the operation board 500 that controls input reading and display output of the operation board 500 is written. The RAM is a working memory used by the CPU. Through communication with the system controller 501, the panel is operated to perform input for the user to input system settings, and display and input control for displaying the setting contents and status of the system to the user.

  The black (Bk), yellow (Y), cyan (C), and magenta (M) write signals output from the work memory of the system controller 501 are the LDB (Laser Diode control Board) Bk, Y, M, Input to a C LD (Laser Diode) writing circuit. The LD write circuit performs LD current control (modulation control) and outputs the result to each LD.

  The engine control 510 is a process controller that mainly controls image formation for image formation, and includes a CPU, an IPP that performs image processing, a ROM that contains programs necessary to control copying and printout, and control of the CPU. Necessary RAM and NV-RAM are installed. The NV-RAM is equipped with an SRAM and a memory that detects power-off and stores it in the EEPROM. In addition, an I / O ASIC that also has a serial interface that transmits and receives signals to and from other CPUs that perform control is a nearby I / O (counter, fan, solenoid, motor, etc.) on which an engine control board is mounted. ASIC for controlling the). The I / O control board 513 and the engine control board 510 are connected via a synchronous serial interface.

  The I / O control board 513 is equipped with a sub CPU 517, and includes a temperature sensor, a potential sensor, a photoconductor density sensor (P sensor) as a toner amount sensor, and optical sensors 81 and 82 as toner density sensors, and The image forming apparatus performs I / O control including reading of detection signals of various other sensors, analog control, jam detection referring to detection signals of the paper sensor, and paper conveyance control. The interface circuit 515 is an interface circuit with various sensors and actuators (motors, clutches, solenoids). The aforementioned optical sensors 81 and 82 are included in various sensors 516.

  The power supply unit PSU 514 is a unit that supplies power to control the image forming apparatus. When the main SW is turned on (closed), commercial power is supplied. The commercial AC is supplied from the commercial power source to the AC control circuit 540, and the AC control output controlled so as to be rectified and smoothed by the AC control circuit 540 is used to allow the power supply unit PSU 514 to generate a DC voltage necessary for each control board. Supply. The CPU of each control unit operates using a constant voltage generated by the power supply unit PSU.

  The copying machine includes data acquisition means for acquiring various information related to the state of the components and phenomena occurring inside. This data acquisition means includes an engine control 510, an I / O control 513, various sensors 516, an operation board 500 and the like shown in FIG. The engine control 510 is a control unit that controls the entire hardware of the copier, a ROM that is a data storage unit that stores a control program, a RAM that is a data storage unit that stores calculation data, control parameters, and the like, and a calculation unit A CPU or the like. In this copying machine, the data acquisition means including the engine control 510, the I / O control 513, the various sensors 516, the operation board 500 and the like is used to determine an abnormality sign stored in the data storage means such as the RAM and ROM of the engine control 510. And the failure determination program and reference data group, and the various types of acquired information periodically acquired from the copying machine and written in the RAM and NV-RAM of the engine control 510, the abnormality of the copying machine to be examined It also functions as a determination device that determines signs and failures.

In this specification, the state data is one of a value of a control parameter that affects the image forming characteristics, detection data by the state sensor, and evaluation data generated based on the detection data. That is, the state data includes detection data, evaluation data, and control parameter values.
-Acquired data-
Examples of various data acquired by the data acquisition unit of the copying machine include state detection data, control parameter data, input data, and image reading data. Hereinafter, these data will be described in detail.

(A) Status detection data Status detection data is used to determine driving conditions, various characteristics of recording media, developer characteristics, photoreceptor characteristics, various process conditions of electrophotography, environmental conditions, various characteristics of recorded matter, and the like. The state value to detect. The outline of the state detection data is as follows.

(A-1) Drive system data / Rotation speed of the photosensitive drum is detected by an encoder, the current value of the drive motor is read, and the temperature of the drive motor is read.
Similarly, the drive state of a cylindrical or belt-like rotating part such as a fixing roller, a paper transport roller, or a drive roller is detected.
-Detect sound generated by driving with a microphone installed inside or outside the device.

(A-2) Paper transport status-The position of the leading or trailing edge of the transported paper is read by a transmission or reflection type optical sensor or contact type sensor to detect that a paper jam has occurred. Reads deviations in the passage timing of the leading and trailing edges of the paper and fluctuations in the direction perpendicular to the feeding direction.
Similarly, the paper moving speed is obtained based on the detection timing between a plurality of sensors.
The slip between the paper supply roller and the paper during paper supply is obtained by comparing the measured value of the rotation speed of the roller with the amount of movement of the paper.

(A-3) Various characteristics of a recording medium such as paper This data greatly affects the image quality and stability of sheet conveyance. There are the following methods for acquiring the paper type data.
-The thickness of the paper should be equal to the amount of movement of the member pushed up when the paper is sandwiched between two rollers and the relative positional displacement of the rollers is detected by an optical sensor or the paper enters. Find by detecting.
-The surface roughness of the paper is such that a guide or the like is brought into contact with the surface of the paper before transfer, and vibrations or sliding noises caused by the contact are detected.
-For the gloss of paper, a light beam with a specified opening angle is incident at a specified incident angle, and a light beam with a specified opening angle reflected in the specular reflection direction is measured by a sensor.
The paper rigidity is obtained by detecting the amount of deformation (curvature) of the pressed paper.
The judgment as to whether or not the paper is recycled is made by irradiating the paper with ultraviolet rays and detecting its transmittance.
The determination as to whether the paper is a backing paper is performed by irradiating light from a linear light source such as an LED array and detecting the light reflected from the transfer surface with a solid-state image sensor such as a CCD.
Whether or not the sheet is for OHP is determined by irradiating the paper with light and detecting regular reflection light having a different angle from the transmitted light.
-The amount of water contained in the paper is determined by measuring the Kyushu of infrared or microwave light.
-The amount of curl is detected by an optical sensor, contact sensor, etc.
-The electrical resistance of the paper is measured directly by contacting a pair of electrodes (such as paper feed rollers) with the recording paper, or by measuring the surface potential of the photoconductor or intermediate transfer body after paper transfer, and recording from that value. Estimate the resistance of the paper.

(A-4) Developer characteristics The characteristics of the developer (toner and carrier) in the apparatus influence the basic function of the electrophotographic process. Therefore, it becomes an important factor for the operation and output of the system. Obtaining developer information is extremely important. Examples of the developer characteristics include the following items.
-For toner, list charge amount and distribution, fluidity, cohesion, bulk density, electrical resistance, amount of external additive, consumption or remaining amount, fluidity, toner concentration (mixing ratio of toner and carrier) Can do.
-As for carriers, magnetic properties, coat film thickness, spent amount, etc. can be mentioned.

It is usually difficult to detect these data alone in a copying machine. Therefore, it may be detected as a comprehensive characteristic of the developer. The overall characteristics of this developer can be measured, for example, as follows.
A test latent image is formed on the photoconductor, developed under predetermined development conditions, and the reflection density (light reflectance) of the formed toner image is measured.
A pair of electrodes is provided in the developing device, and the relationship between applied voltage and current is measured (resistance, dielectric constant, etc.).
-Install a coil in the developing device and measure the voltage-current characteristics (inductance).
-A level sensor is provided in the developing device to detect the developer capacity. The level sensor includes an optical type and a capacitance type.

(A-5) Photoreceptor characteristics The photoreceptor characteristics are closely related to the function of the electrophotographic process as well as the developer characteristics. The photoconductor characteristics data include photoconductor film thickness, surface characteristics (friction coefficient, unevenness), surface potential (before and after each process), surface energy, scattered light, temperature, color, surface position (flare), linear velocity. , Potential decay rate, electrical resistance, capacitance, surface moisture content and the like. Among these, the following data can be detected in the copying machine.
・ Detect the current flowing from the charging member to the photoconductor, and simultaneously compare the change in capacitance with the change in film thickness with the voltage-current characteristics with respect to the voltage applied to the charging member and the preset dielectric thickness of the photoconductor. Thus, the film thickness is obtained.
-The surface potential and temperature can be determined by a conventionally known sensor.
-The linear velocity is detected by an encoder attached to the photoconductor rotating shaft.
-Scattered light from the surface of the photoreceptor is detected by an optical sensor.

(A-6) Electrophotographic Process State As is well known, toner image formation by electrophotography is performed by uniformly charging a photoreceptor, forming a latent image (image exposure) by laser light, etc., and charged toner (colored particles). Development by transfer, transfer of toner image onto transfer material (in the case of color, overlay on the recording medium that is the intermediate transfer body or final transfer material, or over development on the photoreceptor during development), toner on the recording medium This is done in the order of image fixing. Various information at each of these stages greatly affects the output of images and other systems. Obtaining these is important in evaluating the stability of the system. Specific examples of the electrophotographic process state data acquisition include the following.
The charging potential and the exposure portion potential are detected by a conventionally known surface potential sensor.
The gap between the charging member and the photosensitive member in non-contact charging is detected by measuring the amount of light that has passed through the gap.
・ Electromagnetic waves from electrification are captured by a broadband antenna.
・ Sound generated by charging.
-Exposure intensity.
-Exposure light wavelength.

Examples of the method for acquiring various states of the toner image include the following.
The pile height (the height of the toner image) is obtained by measuring the depth from the vertical direction with a displacement sensor and the light shielding length from the horizontal direction with a linear sensor of parallel light.
The toner charge amount is measured by a potential sensor that measures the potential of the electrostatic latent image on the solid part and the potential when the latent image is developed, and the ratio to the adhesion amount converted from the reflection density sensor at the same location. Ask for.
The dot fluctuation or dust is detected by detecting the dot pattern image with an infrared light area sensor on the photosensitive member and with an area sensor having a wavelength corresponding to each color on the intermediate transfer member, and performing appropriate processing.
The offset amount (after fixing) is obtained by reading the corresponding locations on the recording paper and the fixing roller with optical sensors and comparing them.
An optical sensor is installed after the transfer process (on the PD and on the belt), and the transfer remaining amount is determined based on the amount of reflected light from the transfer residual pattern after the transfer of the specific pattern.
-Detect color unevenness during overlay with a full-color sensor that detects the recording paper after fixing.

(A-7) The characteristics, image density, and color of the formed toner image are optically detected. Either reflected light or transmitted light may be used. What is necessary is just to select a light projection wavelength according to a color. In order to obtain density and single color information, it may be on a photoconductor or an intermediate transfer body, but it is necessary on paper to measure a color combination such as color unevenness.
For gradation, the reflection density of the toner image formed on the photosensitive member or the toner image transferred to the transfer member is detected by an optical sensor for each gradation level.
Sharpness is obtained by reading an image in which a line repetition pattern is developed or transferred using a monocular sensor having a small spot diameter or a high-resolution line sensor.
The graininess (roughness) is obtained by reading a halftone image and calculating a noise component by the same method as the sharpness detection.
The registration skew is obtained from the difference between the registration roller ON timing and the detection timing of both sensors by providing optical sensors at both ends in the main scanning direction after registration.
Color misregistration is detected by a monocular small-diameter spot sensor or high-resolution line sensor at the edge portion of the superimposed image on the intermediate transfer member or recording paper.
Banding (density unevenness in the feed direction) measures density unevenness in the sub-scanning direction with a small-diameter spot sensor or high-resolution line sensor on the recording paper, and measures the signal amount of a specific frequency.
Glossiness (unevenness) is provided so that a recording paper on which a uniform image is formed is detected by a regular reflection optical sensor.
・ Fog is a method of reading the image background with an optical sensor that detects a relatively wide area on the photoconductor, intermediate transfer member, or recording paper, or image information for each area of the background with a high-resolution area sensor. And the number of toner particles contained in the image is counted.

(A-8) The physical characteristics of the printed matter of the image forming apparatus, the image flow, the image blur, etc. are obtained by detecting the toner image on the photosensitive member, the intermediate transfer member, or the recording paper by the area sensor. Is determined by image processing.
The toner dust stain is obtained by taking an image on a recording sheet with a high resolution line sensor or an area sensor and calculating the amount of toner scattered around the pattern portion.
The trailing edge blank and the solid cross blank are detected by a high resolution line sensor on the photosensitive member, the intermediate transfer member, or the recording paper.
• Curling, undulation and crease of the recording paper are detected by a displacement sensor. In order to detect a fold, it is effective to install a sensor near the both ends of the recording paper.
-For the dirt and scratches on the edge surface, the area sensor is used to capture and analyze the edge surface when paper discharge has accumulated to some extent by the area sensor installed vertically on the paper discharge tray.

(A-9) For detection of environmental conditions and temperature, a thermocouple system that takes out a thermoelectromotive force generated at a contact point between dissimilar metals or between a metal and a semiconductor as a signal, and the resistivity of the metal or semiconductor varies depending on the temperature. Resistivity change element using this, pyroelectric element that generates a potential on the surface due to bias in the arrangement of charges in the crystal due to the rise in temperature in certain crystals, and magnetic characteristics depending on temperature It is possible to employ a thermomagnetic effect element or the like that detects the change of.
-For humidity detection, there are an optical measurement method for measuring light absorption of H ₂ O or OH group, a humidity sensor for measuring a change in electric resistance value of a material due to adsorption of water vapor, and the like.
・ Various gases are basically detected by measuring changes in the electrical resistance of the oxide semiconductor accompanying gas adsorption. Although there are optical measurement methods and the like for detection of airflow (direction, flow velocity, gas type), an air bridge type flow sensor that can be made smaller in consideration of mounting on a system is particularly useful.
-There are methods for detecting pressure and pressure, such as using a pressure sensitive material and measuring the mechanical displacement of the membrane. A similar method is used for vibration detection.

(B) Control parameter data Since the operation of the copying machine is determined by the control unit, it is effective to directly use the input / output parameters of the control unit.

(B-1) Image Forming Parameters Direct parameters output by the control unit through image processing for image formation include the following examples.
A process condition setting value by the control unit, such as a charging potential, a developing bias value, a fixing temperature setting value, and the like.
-Similarly, setting values for various image processing parameters such as halftone processing and color correction.
Various parameters set by the control unit for the operation of the apparatus, for example, paper conveyance timing, execution time of the preparation mode before image formation, and the like.

(B-2) User operation history / frequency of various operations selected by the user, such as the number of colors, the number of sheets, and an image quality instruction.
The frequency of the paper size selected by the user.

(B-3) Power consumption / Total power consumption or its distribution, change amount (differentiation), cumulative value (integration), etc. for the whole period or for a specific period (one day, one week, one month, etc.).

  (B-4) Consumables consumption information-Amount of toner, photoconductor, paper used or distribution, change amount (differentiation), cumulative value of whole period or specific period unit (1 day, 1 week, 1 month, etc.) Integration) etc.

(B-5) Abnormality occurrence information-Frequency of abnormal occurrence (by type) or its distribution, change amount (differentiation), cumulative value (integration) for the whole period or specific period unit (1 day, 1 week, 1 month, etc.) Such.

(B-6) Operation time information (operation time information)
-The operation time of the copying machine is measured by a time measuring means and stored.

  (B-7) Number of times of printing operation (number of times of operation)-Counts up for each printout and stores the count value.

(C) Input image information The following information can be acquired from image information sent directly as data from a host computer or image information obtained after image processing is performed by reading a document image from a scanner.
The cumulative number of colored pixels is obtained by counting image data for each GRB signal for each pixel.
The original image can be separated into characters, halftone dots, photographs, and backgrounds by an image area separation method as described in, for example, Japanese Patent No. 2621879, and the ratios of character portions, halftone portions, and the like can be obtained. Similarly, the ratio of color characters can be obtained.
The toner consumption distribution in the main scanning direction can be obtained by counting the cumulative value of the colored pixels for each area divided in the main scanning direction.
The image size is obtained from the distribution of colored pixels in the image size signal or image data generated by the control unit.
-Character type (size, font) is obtained from character attribute data.

Next, a specific method for acquiring various data referred to in this copying machine will be described below.
(1) Temperature data The copying machine includes a temperature sensor that acquires temperature information using a variable resistance element that is simple in principle and structure and that can be miniaturized.

(2) Humidity data Humidity sensors that can be made compact are useful. The basic principle is that when water vapor is adsorbed on moisture-sensitive ceramics, the ionic conduction is increased by the adsorbed water and the electrical resistance of the ceramics is reduced. The material of the moisture-sensitive ceramic is a porous material, and generally, an alumina type, an apatite type, a ZrO2-MgO type, or the like is used.

(3) Vibration data The vibration sensor is basically the same as a sensor that measures atmospheric pressure and pressure, and a silicon-based sensor that can be miniaturized is particularly useful in consideration of mounting in a system. The change in capacitance between the counter electrodes provided to face the vibrator is measured by the movement of the vibrator manufactured on the thin silicon diaphragm. It can also be measured by utilizing the piezoresistance effect of the Si diaphragm itself.

(4) Toner density (4 colors) data in developer The toner density is detected for each color and converted into data. As the toner density sensor, a conventionally known type is used. For example, the toner density is detected by a sensing system that measures a change in the magnetic permeability of the developer in the developing device as described in JP-A-6-289717.

(5) Photoconductor uniform charging potential (for four colors) data The uniform charging potential is detected for each color photoconductor 40 (K, Y, M, C). A known surface potential sensor that detects the surface potential of the object is used.

(6) Data after exposure of photoreceptor (4 colors) data The surface potential of the photoreceptor 40 (K, Y, M, C) after optical writing is detected in the same manner as in (5) above.

(7) Colored area ratio (for four colors) data From the input image information, a colored area ratio is obtained for each color from the ratio of the cumulative value of pixels to be colored and the cumulative value of all pixels, and this is used.

(8) Development toner amount (for four colors) data The reflection type photosensor 81 indicates the density (toner adhesion amount per unit area) of each color toner image developed on the photoreceptor 40 (K, Y, M, C). , 82 based on the received light amount signal.

(9) Inclination of paper leading edge position A pair of optical sensors that detect transfer paper at both ends in a direction orthogonal to the conveyance direction somewhere in the paper feed path from the paper feed roller 42 of the paper feed unit 200 to the secondary transfer nip. Is installed to detect both ends near the leading edge of the transferred transfer paper. For both light sensors, the time to pass is measured with reference to the time when the drive signal of the paper feed roller is transmitted, and the inclination of the transfer paper with respect to the feed direction is obtained based on the time deviation.

(10) Paper discharge timing data The transfer paper after passing through the pair of discharge rollers (56 in FIG. 1) is detected by an optical sensor. In this case as well, the measurement is performed with reference to the time when the paper feed roller drive signal is transmitted.

(11) Photoconductor total current (for four colors) data The current flowing from the photoconductor 40 (K, Y, M, C) to the ground is detected. Such a current can be detected by providing a current measuring means between the substrate of the photoreceptor and the ground terminal.

(12) Photoconductor driving power (for four colors)
Driving power (current × voltage) consumed by the driving source (motor) of the photosensitive member during driving is detected by an ammeter, a voltmeter, or the like.

-Various data acquisition timing-
The various data items (1) to (12) are read by the I / O control 513 in accordance with an instruction from the engine control 510 (CPU of the same, hereinafter the same) at a timing determined for each. The engine control 510 stores the various data read into the status information database (DB) assigned to the NV-RAM in the engine control 510 with the print number integrated value at that time added, and based on the various data, each part of the copier The state is determined, and if necessary, the control parameter is adjusted corresponding to the state to determine a failure.

  FIG. 9 shows the contents of the “toner density adjustment” IDA for setting the light emission intensity adjustment value R, the development bias adjustment value Q, and the exposure adjustment value P, which are control parameters. When the process proceeds to “toner density adjustment” IDA, the engine control 510 drives the image forming mechanism (S21), digitally converts the light reception signals of the regular reflection PDs of the optical sensors 81 and 82, and this is the reference value (FIG. 6). (B) target received light amount), the energization current value of the LED in the photosensor is adjusted (S22). As a result, the toner image density can be accurately measured without being affected by variations in the light emitting and receiving elements, changes with time, and changes with time of the surface states (background stains) of the photoreceptor and the transfer belt. The adjustment value (adjustment allowance for a fixed reference current value) is R. The adjustment value R also includes information on the surface state (dirt) of the photoreceptor and the transfer belt.

  Next, a test pattern mark (toner image: 83C1 shown in FIG. 5B, etc.) having a density of five levels for each color is formed on the photosensitive member with the charging and developing bias set to reference values, and is formed on the intermediate transfer belt 10. Transfer (S23). Then, the toner density of the test pattern transferred to the intermediate transfer belt 10 is detected (S24). Next, as shown in FIG. 10, the slope γ and the intercept x0 of the characteristic line, that is, the linearly approximated development potential / toner adhesion amount straight line, are calculated from the received light signals of five points of one color (S25). Development bias adjustment and exposure amount adjustment are performed to correct the intercept x0 to the intercept of the reference characteristic line and correct the slope γ to the slope of the reference characteristic line. The adjustment allowance from each reference value at this time is the development bias correction value Q and the exposure correction value P. These R, Q, and P are accumulated in the NV-RAM in the engine control 510 with the print number integrated value at that time.

  In this example, the developing bias and the amount of exposure light are corrected. Of course, other process control values that contribute to image density such as charging potential and transfer current may be corrected to obtain the same result.

  These process controls are operated for the purpose of correcting fluctuations in the charge amount of toner within the normal range due to temperature and humidity and fluctuations in the sensitivity of the photoconductor, but they are also measured when there are specific abnormalities or signs of abnormalities. The parameter determined based on the value or the measured value may vary. For example, the cleaner installed for the purpose of collecting the toner remaining without being transferred onto the photoconductor after the transfer and maintaining normal charging exposure is often used with a blade cleaning system that rubs the photoconductor with a urethane rubber blade. However, because of such a configuration, a part of the toner sinks under the blade and passes. The toner that has passed passes through the charged exposure part and is recovered by development, but the charging characteristics are lost due to frictional action by the blade or the shape is changed, so that the toner is not recovered by development and the image is transferred to the transfer body. Regardless of whether it is a part or a non-image part, there are some which adhere non-electrostatically and are transferred as they are. For these reasons, a very small amount of toner particles are adhered to the non-image area, but the image quality is not significantly impaired because of the very small amount.

  When the photosensitive member contact portion of the blade is worn due to long-term rubbing, the scraping force decreases, and the amount of passing toner tends to increase at an accelerated rate. Finally, when a large amount of residual toner passes through the blade at once, the charging device deteriorates the charging ability due to contamination by the toner, the function of the exposure unit also deteriorates due to the attenuation by the toner, and the developing unit also has such a large amount of toner. Can not be recovered, and finally, an extremely unacceptable vertical-shaped abnormal image occurs, which immediately becomes a failure state requiring repair.

  By the way, the toner adhesion amount has increased substantially uniformly on the entire image carrier shortly before such a state is reached, but at this point in time, the image is not deteriorated so as to be noticed by the user. , Very rarely noticed. This state is called “light soiling” and is considered to be a sign of a cleaner abnormality (cleaning failure). As shown in FIG. 11B, the presence of such toner has an effect of increasing the measurement result particularly in the low density portion, and causes a slight decrease in the slope γ and a decrease in the intercept X0. FIG. 12 shows the characteristic lines of each color thus obtained.

  In general, there is no great difference from the environmental aging range of toner and photoconductor, and it has been extremely difficult and accurate to determine this occurrence from single-color γ or x0 or correction parameters Q and P determined based on this. It is difficult to make a warning alarm, and the conventional apparatus clearly gives an alarm of abnormality or failure when it deviates from normality, and it is difficult to quickly recognize the warning sign at the stage of abnormal warning.

-Abnormal sign detection-
FIG. 10 shows an outline of the abnormality sign determination process executed by the engine control 510 (CPU). This is executed after the end of the printing operation after the engine control 510 has executed printing (image formation) of a set number of 1000 sheets or more from the print number integrated value at the time of the previous abnormality sign determination processing.

  When the process proceeds to the “abnormal sign determination” PAD, the engine control 510 extracts the copier status data stored in the NV-RAM from the latest one to the previous one in total (S1). ), A feature amount, which is target data for abnormality sign determination, is calculated for each state data (state detection data and control parameter data) (for example, for each R, Q, and P) (S2). In this embodiment, the temporal distribution (change pattern) of the 16 state values is converted into an index value representing the feature. This conversion process is determined for each data (for example, for each of R, Q, and P).

Here, only the feature amount calculation of the light emission intensity adjustment value R, the development bias correction value Q, and the exposure amount correction value P is extracted and shown in FIG. The light intensity adjustment value R1 of the optical sensor 81 is divided equally into 15 sections at equal intervals between the data of both ends of 16 points, that is, the latest data and the oldest data, and the print number integrated value. Data values are calculated by interpolation and extrapolation methods, and a new 16-point data group is generated together with the data at both ends (S311). Next, the average value Rm1 of the new 16-point data, the average value Rsm1 of the data of the first to fourth points from the latest, the average value Rsm2 of the data of the fifth to eighth points, and the average value of the data of the ninth to twelfth points An average value Rsm4 of Rsm3 and the data of the thirteenth to sixteenth points is calculated, and a difference between the calculated values, Rsm1-Rsm2, Rsm2-Rsm3, and Rsm3-Rsm4 are calculated to obtain a maximum value Rsmm1 of these differences (S312). ). Then, the feature amount Rv1 of the light emission intensity adjustment value R is set to
Rv1 = Rk · | Rsmm1 | / | Rm1 |
Is calculated (S313). Rk is a coefficient (fixed value) for adjusting the range of the calculation value. The above is the content of the calculation S31 of the feature amount Rv1 of the light emission intensity adjustment value R1 of the optical sensor 81. Calculation S32 of the characteristic amount Rv2 of the light emission intensity adjustment value R2 of the optical sensor 82, the development amount adjustment values Q (Y), Q (M), Q (C), and Q (Bk) of the characteristic amounts Q ( Y) Calculations S33 to S36 of v, Q (M) v, Q (C) v and Q (Bk) v, and exposure amount adjustment values P (Y), P (M), P ( C) and P (Bk) feature values P (Y) v, P (M) v, P (C) v and P (Bk) v are calculated in S37 to S40. This is the same as the content of the calculation S31.

  The calculated feature amounts are the gradients or speeds of changes in the adjustment values shown in FIG. 17 for the development bias adjustment values Q (Y), Q (M), Q (C), and Q (Bk) for the toner density adjustment of each color. It corresponds to.

  In addition to such difference values, such feature values can be obtained by various calculation formulas such as regression values of signal changes, standard deviation, maximum value, and average value of recent data. it can. Many such time-series signal feature extraction methods such as the ARIMA model have been proposed, and an appropriate method may be used.

  We think that the sign of abnormality is captured by the fact that the signal that was stable when it was normal showed unusual and unstable movements in various forms. From this viewpoint, an appropriate feature quantity extraction method may be selected. Further, the index of time passage is not limited to the above-mentioned print number integrated value, and an operating time integrated value, an actual time elapsed value, or the like can be selected. Further, adding the feature amount not including temporal calculation or the state data itself to the target data for the abnormality sign determination does not impair the merit of the present invention. For example, the state detection value itself at that time may be added to the target data. That is, the target data for the abnormality sign determination is either or both of the feature amount and the state data generated based on the state data.

  Refer to FIG. 13 again. The feature amount generated by the calculation and other target data to be generated or extracted are accumulated in the target data table (TB) allocated to the NV-RAM in the engine control 510 (S3), and the tendency of each target data generated or extracted this time is stored. After discrimination (S4), the tendency discrimination result is stored in the trend discrimination table (S5). In the trend determination of each target data, stamp determination for determining the presence or absence of an abnormal trend is performed for each target data by comparing the size with a reference value, which is a first determination unit. That is, the reference value b assigned to each target data (No .; corresponding to R, Q, P, for example) in the sign determination reference data table (FIG. 18) in which each target data is written in the RAM in the engine control 510. It is binarized so that there is no abnormal tendency (“0”) if it is below, and there is an abnormal tendency (“1”) if it is above the reference value b.

  Next, a weighted majority calculation of the tendency determination result, which is the second determination means, is performed (S6). That is, the weight α addressed to each target data in the sign determination reference data table (FIG. 18) is given negative polarity (−) if the tendency determination result is “1” (abnormal trend exists), and the tendency determination result If the value is “0” (no abnormal tendency), a positive polarity (+) is given and added. Polarity data is expressed as sgn. The added value is used as a predictive index value F. The predictive index value F is accumulated in a predictive index value table assigned to the NV-RAM in the engine control 510 (S7). An example of the predictive index value F is shown at the bottom of FIG. 14, and several examples are shown in FIG.

  When the sign index value F is 0 or less, sign determination information “1” indicating the presence of an abnormal sign is generated, and when it exceeds 0, sign determination information “0” indicating no abnormal sign is generated (S8). Are stored in the sign determination table assigned to the NV-RAM (S9).

  When the sign determination information generated this time is “0” (no sign of abnormality) (S10), the management apparatus 630 includes data indicating normality and the 16-point status information with the print number integrated value extracted in step S1. (S11). When the sign determination information generated this time is “1” (abnormal sign is present) (S10), the data group that is determined whether or not each target data that is generated this time has an abnormal tendency in the stamp determination table is indicated as a sign. It is encoded into data representing a sign (trend) of an abnormal state determined to be present (cleaning failure, image abnormality, resist abnormality on transfer paper, toner shortage, hardware abnormality, etc.) (S12), and the abnormality sign is resolved. The maintenance necessary for the operation is displayed on the display of the operation board 500 (S13), and the data indicating the sign of abnormality and the 16-point status data with the integrated print number extracted in step S1 are transmitted to the management device 630. (S14).

  In addition, when there is an initialization input of a repaired element upon completion of repair from the operation board 500, the engine control 510 performs an exception process so that a transient change in state data immediately after repair is not erroneously determined as an abnormal sign state. In the exception processing of this embodiment, the state information after repair of the repaired element is written in the state information database with the data with correction added. Then, when 16 points of state data are extracted in step S1, if the data with correction is included therein, the target data generation and trend determination in steps 2 to S5 relating to the state data are not executed, and the trend relating to the state data is not executed. The discrimination data is determined to have no tendency (“0”).

  Further, when the engine control 510 collects the state data and recognizes the abnormality of the state data, the engine control 510 displays the abnormality on the display of the operation board 500, and at that time, the state data set, the abnormality content (abnormality form), and the abnormality occurrence Is transmitted to the management apparatus 630. This “abnormality” may not be a sign detection target of the abnormality sign determination PAD, but the reference value and the weight value may be insufficiently adjusted for the abnormality.

  In order to cope with this, the copying machine according to the present embodiment includes a sign determination reference table in which each reference value and each weight value of the sign determination reference table in the apparatus can be individually changed by an initialization input operation on the operation board 500. A user with administrator authority or an operator who operates the management apparatus 630 individually uses the initialization function to individually set each reference value and each weight value in the in-flight sign determination reference table. Can be adjusted.

  The management apparatus 630 stores the data transmitted by each copying machine in step S11 or S14 and the data transmitted when an abnormality occurs in a database addressed to each copying machine built inside the management apparatus. Then, by the discriminator generation process that carries out interactive cooperation with the operator who operates the management apparatus 630, the notification is made without receiving any indication based on the status data collected from the copier group of the same model in the database. Generate (correct) the reference value b and the weight α used in the tendency determination (first determination) in step S4 and the sign determination (second determination) in steps S6 to S8 for detecting (determining) a sign of abnormality. Then, a predictive judgment reference table including those (corresponding to the one shown in FIG. 18) is generated and downloaded to the corresponding copying machine via the network or stored in a portable information medium. Bring it to the relevant copier and rewrite the existing sign determination reference table in the copier. As a result, the copying machine then determines a sign of the abnormality that has been previously notified to the management apparatus 630.

  According to the “abnormal sign determination” PAD described above, the determination process is defined by the reference value b for stamp determination for each target data, the weight sign (sgn) when the reference value is larger than the reference value, and the weight α. There are only three values. In the weighted majority vote, since a large weight value α is given to target data having a large influence and Σsgn × α is calculated, the processing load is very small. By simply changing these discrimination condition values, a completely different discriminator (first discrimination means + second discrimination means) can be created. For example, each sign determination reference table (determination condition value set) corresponding to each abnormality is stored in a memory, and the sign determination in steps S4 to S8 is sequentially repeated or performed in parallel for each sign determination reference table. As a result, an abnormality that is difficult to determine with the use of one sign determination reference table can be determined with another sign determination reference table. Each sign determination reference table can be updated or added by downloading from the management apparatus 630 via a network or installing from a portable memory such as an SD card.

  The “abnormality sign determination” PAD performs the presence / absence determination (S4) of each of the 31 types of target data and the weighted majority of the determination results (S6 to S8). , 10 types of feature values Rv1, Rv2, Q (Y) v, Q (M) v, Q (C) v, Q (Bk) v, P (Y) v, P (M) v, P (C) v and P (Bk) v are included. The “abnormal sign determination” using only these feature amounts as target data is a defective cleaning of the photoreceptor 40 (Bk) for forming a Bk image (black cleaning failure) and / or a cleaning failure of the intermediate transfer belt 10 ( (Including fixing of dirt).

  FIG. 19 shows an outline of the “black cleaning failure sign determination” PADbc that calculates only the above-described ten types of feature values and determines a sign of cleaning failure as target data. This “black cleaning failure sign determination” PADbc extracts a part of the contents of the “abnormal sign determination” PAD in FIG. 13 and forms an independent lower sign determination. Each of S64 corresponds to steps S1 to S14 in FIG.

  In step S8 of FIG. 13, it is determined whether or not there is a sign of abnormality as a copying machine, but the 31 types of target data calculated in step S2 are cleaning failure, image abnormality, resist abnormality on transfer paper, toner shortage, hardware abnormality. Etc. (but there are also target data belonging to a plurality of groups). In step S12, the group ( It is encoded into data representing whether or not cleaning failure, image abnormality,...) Is an abnormality sign (whether there is a sign of abnormality of cleaning failure, image abnormality,...).

  It should be noted that steps S56 to S59 may be subjected to a weighted majority calculation in the above-described group classification to determine the presence / absence of an abnormal sign for each group, and step S12 may be omitted. In this embodiment, the “black cleaning failure sign determination” PADbc shown in FIG. 19 can be said to be extracted only for the group for determining the “cleaning failure” sign.

  Next, how the sign determination reference table (FIG. 18) is created will be described. The sign determination reference table provided in the copying machine 601 is generally created using a supervised learning algorithm called a boosting method. The boosting method is, for example, mathematical science no. 489, MARCH 2004 “Statistical Pattern Identification Information Geometry” and is well known. In summary, first, state data that is known in advance to be in a normal state and state data that is known to be in an abnormal sign state are prepared. For example, a status data log is taken when performing an endurance test of the device, and when an abnormal case is encountered, a period of a predictive state before the abnormality is estimated and utilized as the data. The inventors collected and verified abnormal cases while actually collecting more than 10 image forming apparatuses over a period of 3 months.

  Q (Y), Q (M), Q (C), and Q (K) shown in FIG. 14 are obtained when one of the copying machines operating in the market has a Bk color and causes a cleaning failure and is repaired. This is the result of recording the change in the development bias adjustment value Q for each color for three months. Similarly, only state data Q (development bias adjustment value) in which a large number of other state data is recorded and utilized but the change is remarkable will be introduced. In this way, it is observed that the development bias adjustment values for the Y, M, and C colors fluctuate prior to the Bk color cleaning failure.

  Therefore, generation of target data (feature amount calculation) described above (S2, S52) was performed. The calculated feature value is represented in a graph with the print number integrated value on the horizontal axis, and the abnormal sign period is estimated by visual observation. The label of the section corresponding to the abnormal sign period is -1 (abnormal sign period), otherwise The label of 1 was given as 1 (normal period), and 31 repetitions of learning were performed by boosting, and b1 to b31, sgn1 to sgn31, and α1 to α31 were determined. B1 to b31 and α1 to α31 were used as the sign determination reference table (FIG. 18). The result of calculating the F value using the sign determination reference table is shown next to Q (K) in FIG. The labeled supervised data consists of a weak discriminator (first discriminating means: S4) in which only the portion corresponding to the predictor is properly learned and changes to an F value minus, and a strong discriminator (second discriminator based on weighted majority). It was confirmed that the discrimination means: S6 to S8) were generated. Next, whether or not this discriminator gives an appropriate result to the test data not used for learning is based on the same procedure from the status information of the devices in which the same abnormal cases of 5 units (units 1 to 5) have occurred. FIG. 15 shows the result of the feature amount extraction and post-verification verified. The discriminator output F value that is calculated using the previously determined b and α changes to minus when an abnormal sign state is present prior to the occurrence of the same abnormal case as intended, and the sign state is well distinguished. I was able to confirm that I was able to do it.

  The hardware of the management system of the second embodiment is the same as that of the first embodiment described above. The management apparatus 630 of the second embodiment stores the data transmitted by each copying machine in step S11 or S14 and the data transmitted when an abnormality occurs in a database addressed to each copying machine built inside the management apparatus. To do. Based on the 31 kinds of target data generated in the first embodiment, the warning of the abnormality notified without receiving the warning is detected (determined) by the interactive cooperation with the operator who operates the management apparatus 630. To collect the reference value b and weight α used in the trend determination (first determination) in step S4 and the sign determination (second determination) in steps S6 to S8 from the copier group of the same model in the database. Based on the data, it is generated in the above-described sign determination reference table creation mode, and includes an additional sign determination reference table (corresponding to that shown in FIG. 18) including these, and data of the additional sign determination reference table Anomalous tendency determination of target data using data (first determination means), weighted majority and sign determination (second determination means), display corresponding to sign determination results, data transmission Generate additional abnormality sign determination shiftware including processing and download it to the relevant copier via the network, or store it in a portable information medium and bring it to the copier. It is added as an additional sign determination function to the copying machine.

  When the copying machine to which the additional sign determination function is added calculates the target data group (S2), the abnormality sign determination and the additional abnormality sign determination of the first embodiment are serially executed. Other configurations and functions of the second embodiment are the same as those of the first embodiment.

  The hardware of the management system of the third embodiment is the same as that of the first embodiment described above. The copying machine of the third embodiment transmits other status data to the management apparatus in addition to the status data for calculating the 31 types of target data. The management apparatus stores the status data received from the image forming apparatus in a database addressed to the copying machine. In addition to the 31 types of target data calculated in the first embodiment based on the status data collected from the copier group of the same model in the database by interactive cooperation with the operator who operates the management apparatus 630, other A new group of target data for generating or extracting additional types of target data based on the status data and determining a predictor of abnormality notified without receiving a notification of the sign from the copier, and a standard The value b and the weight α are generated in the above-described sign determination reference table creation mode, and an additional sign determination reference table (corresponding to that shown in FIG. 18) including these values, and the additional sign determination reference table Processing of abnormal trend determination of target data using first data (first determination means), weighted majority decision and sign determination (second determination means), display of corresponding sign determination results, and data transmission Including additional abnormal sign determination shift software, downloaded to the relevant copier via the network, or stored in a portable information medium and brought to the relevant copier to copy Added as an additional sign detection function. Similarly, the “generation of target data” S2 in step S2 of the existing “abnormal sign determination” PAD also generates or extracts the target data of the state data newly added in the additional abnormal sign determination. rewrite.

  When the copying machine to which the additional sign determination function is added as described above calculates the target data group (S2), the abnormality sign determination of the first embodiment and the additional abnormality sign determination are serially executed. Other configurations and functions of the third embodiment are the same as those of the first embodiment.

It is a block diagram which shows the outline | summary of the management system of 1st Example of this invention. FIG. 2 is a longitudinal sectional view showing an outline of the mechanism of a color copying machine 601 having a composite function shown in FIG. 1. FIG. 3 is an enlarged longitudinal sectional view showing an intermediate transfer belt 10 shown in FIG. 2 and surrounding mechanical elements. FIG. 4 is an enlarged vertical view showing a configuration common to four sets of image forming units shown in FIG. 3. FIG. 4A is a perspective view showing optical sensors 81 and 82 for detecting the toner density on the surface of the intermediate transfer belt 10 shown in FIG. FIG. 4B is a plan view showing a test pattern of a toner image formed on the intermediate transfer belt 10. (A) is a block diagram which shows the structure of the optical sensor 81, and shows the aspect which detects the stain | pollution | contamination of a belt surface. (B) is a graph showing the relationship between the energization current value of the LED in the optical sensor 81 that projects light onto the intermediate transfer belt 10 and the level of the light detection signal of the regular reflection PD. (A) is a block diagram showing a configuration of the optical sensor 81 and shows a mode of detecting the density of the toner image of the test pattern transferred to the belt 10. (B) is a graph showing the relationship between the density of the toner image and the level of the light detection signal of the irregular reflection PD in the optical sensor 81. FIG. 3 is a block diagram showing an outline of an image processing system of the copying machine shown in FIG. 2. 9 is a flowchart showing an outline of toner image density adjustment by engine control 510 shown in FIG. 8. 6 is a graph showing a relationship (characteristic line) between a development potential at the time of forming a test pattern toner image transferred onto the transfer belt 10 and a toner density detected by optical sensors 81 and 82; (A) is a graph showing a characteristic line (solid line) measured when the surface of the belt 10 is not particularly dirty and a fluctuation range of the characteristic line, and (b) is a characteristic line when the surface of the belt 10 is slightly dirty. Indicates. It is a graph which shows each color characteristic line when the belt 10 surface becomes dirty. It is a flowchart which shows the outline | summary of the abnormality sign determination which the engine control 510 shown in FIG. 8 implements. 6 is a graph showing fluctuations in the development bias adjustment value Q of each color image of the copying machine 601 and a sign discrimination index value F calculated by an abnormal sign discriminator generated based on these fluctuations. It is a graph which shows the change of the sign discrimination | determination index value F of five copying machines. 6 is a flowchart showing an outline of feature amount calculation of light emission intensity adjustment values R, color development bias correction values Q, and color exposure amount correction values P of optical sensors 81 and 82 in the copying machine 601. It is a graph which shows the outline | summary of a change of the developing bias adjustment value Q (Y) of each color toner density adjustment, Q (M), Q (C), and Q (Bk). 10 is a chart showing an example of a weight value given to an abnormal tendency of a feature amount in calculation of a reference value b and an abnormal sign determination index value F used for determining an abnormal trend of target data in an abnormal sign determination. It is a flowchart which shows the outline | summary of "black cleaning failure sign determination" in abnormality sign determination.

10: Intermediate transfer belt 14-16: Support roller 17: Intermediate transfer member cleaning device 18: Image forming device 20: Image forming device 21: Laser exposure device 22: Secondary transfer roller 23: Roller 24: Conveyor belt 25: Fixing Device 26: Fixing belt 27: Pressure roller 28: Sheet reversing device 32: Contact glass 33: First carriage 34: Second carriage 35: Imaging lens 36: CCD
40: photosensitive drum 42: paper feed roller 43: paper bank 44: paper feed cassette 45: separation roller 46: paper feed path 47: transport roller 48: paper feed path 49: registration roller 50: paper feed roller 51: manual feed tray 55: Switching claw 56: Ejection roller 57: Ejection tray 60: Charging roller 61: Development unit 62: Primary transfer roller 63: Photoconductor cleaning device 64: Static elimination device 65: Development sleeve 66: Stirring unit 67: Development unit 68 : Screw 69: Partition plate 70: Development case 71: Toner density sensor 72: Magnet roller 73: Doctor blade 74: Conductive roller 75: Cleaning blade 76: Fur brush 77: Electric field roller 78: Scraper 79: Collection screw 80: Toner Recycling devices 81 and 82: optical sensor 83: toner image test Turn 90, 91: fur brush 92 and 93: the metal roller 94 and 95: Power

Claims (11)

A photoconductor, a charging unit for charging the photoconductor, an exposure unit for projecting image light onto a charging surface of the photoconductor, a developing unit for developing an electrostatic latent image formed on the photoconductor by the exposure unit into a toner image, Transfer means for transferring the toner image to the sheet via the intermediate transfer member, a photosensor for detecting the density of the toner image transferred to the intermediate transfer member, and reflected light of the light projected on the surface of the intermediate transfer member by the photosensor An optical sensor emission intensity adjusting means for setting a light receiving level of the optical sensor as a reference value; and a toner image density of a test pattern transferred to the intermediate transfer belt is detected by the optical sensor and based on a detection value of the developing means. In an image forming apparatus comprising a toner image density adjusting unit for correcting a developing bias and an exposure amount of the exposing unit ,
State storage means for storing state data including a light emission intensity adjustment value R of the photosensor light emission intensity adjustment means, a development bias adjustment value Q of the toner image density adjustment means, and an exposure adjustment value P ;
The R, respectively Q and P, a plurality of temporally comprises feature extraction means for generating object data representing a transition form of status data of a plurality of points over the last previously, abnormal sign determination for the previous SL state data Target data generating means for generating or extracting seed target data;
First determination means for determining whether or not each target data has an abnormal tendency depending on whether each target data is less than or equal to each reference value set for each target data;
A determination result for the R, Q, and P addressed by the first determining means is attached to the weights set for each target data , and the presence / absence of an abnormality sign for the R, Q, and P as a whole is determined by majority vote. Two discrimination means; and
Means for converting the determination of the presence of the abnormal sign as a whole by the second determining means into data representing a sign of cleaning failure;
An image forming apparatus comprising:   The image forming apparatus management apparatus according to claim 1, wherein the target data is one or both of a feature amount generated based on the state data and the state data. Informing means for outputting a notification corresponding to the data representing the cleaning failure indication; further comprising, an image forming apparatus according to claim 1 or 2. The image forming apparatus according to any one of further comprising claims 1 to 3; first updating means for updating the reference value of the target data addressed to the first discriminating means is used. The image forming apparatus according to any one of claims 1 to 4 further comprising a; second updating means for updating the weights of the target data addressed to the second discriminating means is used. When there is status data to which data indicating that a repaired element of the image forming apparatus has been repaired is included in the plurality of types of status data, the target data generation unit suspends generation of target data for the status data. , first determining means, a determination result that is addressed to the target data of the condition data, determined without abnormal trends; according to any one of claims 1 to 5, the image forming apparatus. A management device for managing status information of the image forming apparatus; and
A management system comprising; communicate over a network to the management apparatus, an image forming apparatus according to any one of claims 1 to 6
The image forming apparatus transmits the plurality of types of state data, the determination of the presence of an abnormality sign by the second determination unit, and the occurrence of the abnormality to the management apparatus;
The management apparatus accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of an abnormality in a database, and the reference value and weight modified based on the state data in response to the occurrence of the abnormality To the image forming apparatus;
The image forming apparatus updates the set reference value and weight to the received one; a management system. The management device updates the reference value and weight used by the first and second determination means to a reference value and weight modified based on status data of a group of image forming apparatuses of the same model in the database; Item 8. The management system according to item 7 . A management device for managing status information of the image forming apparatus; and
A management system comprising; communicate over a network to the management apparatus, an image forming apparatus according to any one of claims 1 to 6
The image forming apparatus transmits the plurality of types of state data, the determination of the presence of an abnormality sign by the second determination unit, and the occurrence of the abnormality to the management apparatus;
The management device accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of abnormality in a database, and determines the presence / absence of the abnormality sign generated based on the stored adjustment value. Additional first determination means and second determination means are set in the image forming apparatus via the network;
The image forming apparatus also executes determination of presence / absence of an abnormality sign using the set additional first determination unit and second determination unit; a management system. A management device for managing status information of the image forming apparatus; and
A management system comprising; communicate over a network to the management apparatus, an image forming apparatus according to any one of claims 1 to 6
The image forming apparatus transmits the plurality of types of status data and other status data, determination of presence of abnormality sign of the second determination unit, and occurrence of abnormality to the management device;
The management apparatus accumulates the status data received from the image forming apparatus, the presence / absence of abnormality sign, and the occurrence of an abnormality in a database addressed to the image forming apparatus, and a plurality of types including the accumulated other status data Additional first determination means and second determination means for determining presence / absence of the abnormality sign generated based on the state data are set in the image forming apparatus via the network;
The image forming apparatus also executes determination of presence / absence of an abnormality sign using the set additional first determination unit and second determination unit; a management system. The management device of the database, based on the state data of the image forming apparatus group of the same model providing an additional first discriminating means and the second discriminating means, according to claim 9 or 10, the management of the image forming apparatus system.

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