KR0164367B1 - Image fixation of electrophoto processor - Google Patents

Abstract

[Technical field to which the invention described in the claims belong]

The present invention relates to an image forming apparatus of an electrophotographic processor in which the fixing unit can be separated up and down to assemble the heating unit and the delivery unit of the fixing unit into separate frames to simplify assembly and to remove paper jams and to replace consumables.

[Technical problem to be solved of the invention]

SUMMARY OF THE INVENTION The present invention provides an image forming apparatus of an electrophotographic processor in which a fuser can be detached from a device body to facilitate convenience by a user.

[Summary of the solution of the invention]

According to the present invention, there is provided a main unit of a fixing unit, a guide unit for guiding transferred recording paper between a compression roller and a heating roller, a compression roller and a heating roller for fixing and compressing a toner image on the recording paper, and the recording paper as a compression roller. And a paper discharge sensor for detecting discharge between the heating roller, a thermistor for sensing and controlling the temperature of the heating roller, a thermal-fuse to prevent overheating of the heating roller, and a rear frame of the fixing unit on the main frame. A locker for coupling is installed, and a rearing frame of the fixing unit is provided with a cleaning-belt for removing the residual toner on the surface of the heating roller and a discharge roller for discharging the recording paper to the outside. Hinges for rotating the rear frame in the vertical direction from the frame is fastened.

[Important Uses of the Invention]

In the present invention, since the rear frame of the fixing unit can be easily opened and closed from the main frame by the locker, electrical materials (compression rollers, heating rollers, thermistors, thermo-fuses, etc.) and badges are formed on the rear frame and main frame. Separate water (medium roller, cleaning-belt) to make a separate assembly, and then the main-frame and the rear frame is combined, so the assembly is convenient, when the jam (jam) of the recording paper in the fixing unit and consumables By replacing the cleaning-belt, the rear frame is opened from the main-frame so that jams of recording paper and replacement of the cleaning-belt as consumables can be easily implemented. After the rear frame is coupled to the main frame, the cleaning belt can be easily adhered to the heating roller, and the cleaning belt is precisely and uniformly fixed to the heating roller. Been in close contact with the pressing force has an effect to easily remove the residual toner on the surface of the heating roller.

Description

Image forming apparatus of electrophotographic processor which can be detached

1 is a schematic diagram showing the configuration of an image forming apparatus of an electrophotographic processor in the prior art;

2 is a schematic diagram showing a configuration of an image forming apparatus of an electrophotographic processor according to the present invention.

3 is a schematic diagram showing a state in which the fixing unit is separated from the image forming apparatus of the electrophotographic processor according to the present invention.

* Explanation of symbols for main parts of the drawings

10 cover 12 developing unit

14: photosensitive drum 16: transfer machine

18: charger 20: exposed portion

22: developing roller 24: cleaner

26: rocker 26a: projection

28: paper discharge sensor 30: rear frame

30a: groove 32: discharge roller

34: cleaning belt 36: hinge

38: thermal-fuse 40: main-frame

42: thermistor 44: guide part

46: compression roller 48: heating roller

50: Fuser

The present invention relates to an image forming apparatus of an electrophotographic processor, and in particular, since the heating unit and the discharge unit of the fixing unit are assembled into separate frames, the fixing unit can be separated up and down for easy assembly and convenient removal of paper jam and convenient replacement of consumables. An image forming apparatus of an electrophotographic processor.

Conventionally, as shown in FIG. 1, there is shown a schematic diagram showing the configuration of an image forming apparatus of an electrophotographic processor, wherein the electrophotographic processor includes a photosensitive drum 70 that rotates clockwise at a constant circumferential speed, and the photosensitive drum 70. One end of the upper end of the photosensitive drum 70 is provided with a charger 66 for electrically charging the electric charge layer uniformly, and the other end of the upper end of the photosensitive drum 70 is electrically charged with the photosensitive drum 70. An exposure unit 64 is formed on the surface to form an electrostatic latent image, and one side of the photosensitive drum 70 is provided with a developing roller 74 for developing toner on the electrostatic latent image formed on the surface of the photosensitive drum 70. The lower end of the photosensitive drum 70 is provided with a transfer unit 72 for transferring a toner image on the surface of the photosensitive drum 70 on a recording paper, the other side of the photosensitive drum 70 is a state in which the transfer process is completed Photosensitive Drums (70) A cleaner 68 for removing toner remaining on the surface is provided, and all of the above components are installed in the developing unit 62, respectively.

In addition, a fixing unit 100 is provided at one side of the developing unit 62.

On the lower surface of one side of the fixing unit frame 78 is provided a guide portion 86 for guiding the recording paper transferred by the transfer device 72 between the compression roller 84 and the heating roller 88, the guide portion One side of the upper end of the 86 is provided with a compression roller 84 and a heating roller 88 for fixing and compressing the toner image on the transferred recording sheet by heat and pressure, and at this time, the lower end of the heating roller 88 is compressed. The roller 84 is in contact.

In addition, one side of the heating roller 88 is provided with a paper guide portion 82 for guiding the recording paper out between the compression roller 84 and the heating roller 88 to the discharge roller 80 side, the heating One side of the roller 88 is provided with a thermistor 92 for turning on / off a heat lamp by sensing and controlling the temperature of the heating roller 88, and one side of the thermistor 92. In order to prevent overheating of the heating roller 88, a thermal-fuse 90 for sensing a temperature is installed, and the other side of the thermistor 92 is a cleaning-removing toner residue on the surface of the heating roller 88. The belt 94 is installed, and one side of the heating roller 88 and the compression roller 84 is provided with a discharge roller 80 for discharging the recording paper to the outside, all the components are installed in the fixing unit 100 Each is installed.

In addition, when a problem occurs in the fixing unit 100 (for example, when replacing a recording paper jam or a cleaning-belt which is a consumable), the cover 60 is rotated upward and downward from the main body frame. The hinge 76 is installed in the device body frame.

The printing process of the image forming apparatus of the electrophotographic processor configured as described above is as follows.

The surface of the photosensitive drum 70 is electrically uniformly charged by the corona discharge of the charger 66, and the portion charged by the rotation of the photosensitive drum 70 forms an image through the exposure unit 64. When the surface of the photosensitive drum 70 is exposed by receiving an electrical signal, an electrostatic latent image is formed in a portion that receives light in an initial charged state.

At this time, the toner is agitated to have a constant charge by a stirrer and moved to the developing roller 74 side by a supply roller (not shown). Thereafter, a toner layer is formed on the surface of the developing roller 74. At this time, the toner layer is formed on the surface of the developing roller 74 at a uniform height by regulation of a doctor blade (not shown).

Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 70 is developed with toner while passing through the developing roller 74 to become a visible image, and then the recording paper mounted on the cassette is fed by the feed roller, and then the recording The toner image on the surface of the photosensitive drum 70 is transferred to the surface of the paper by the high pressure action of the transfer machine 72.

Thereafter, the recording paper is conveyed into the fixing unit 100 along the guide portion 86.

Thereafter, the recording paper passes between the heating roller 88 and the compression roller 84, and an image is fixed on the surface of the recording paper by heat and pressure to the discharge roller 80 along the paper guide 82. After that, the recording paper is conveyed to the pedestal side by the rotation of the discharge roller 80 to produce the desired printing.

On the other hand, the toner remaining on the surface of the photosensitive drum 70 after passing through the transfer device 72 is removed by the cleaner 68.

When using the above-described method, the fuser 100 constitutes a plurality of assembly parts in the frame 78, and thus, difficulties arise in arranging and assembling each of the parts in the fuser 100, and the fuser 100 The frame 78 itself is also designed so that it is not separated from each other without separating the other parts, so that the recording paper uses the hinge 76 when the jam occurs in the fixing unit 100. Rotate clockwise (upper direction), then remove the development unit 62 to remove the jam of the recording paper, and also requires a lot of time to remove the jam of the recording paper. When the cleaning belt 94, which is a consumable item, is replaced, the cover 60 is rotated clockwise (upper direction) by using the hinge 76, and the replacement unit 62 can be replaced by removing the developing unit 62. Make the user uncomfortable In addition, the photosensitive drum 70 is damaged by frequently separating the developing unit 62, so that a high resolution image cannot be formed.

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an image forming apparatus of an electrophotographic processor in which a fuser can be separated by a user from the device main body to facilitate convenience.

Another object of the present invention is to provide an apparatus in which the cleaning-belt which is a consumable can be easily made.

It is still another object of the present invention to provide an apparatus which can easily remove jams of recording paper.

It is still another object of the present invention to provide an apparatus capable of shortening the time for removing jams of recording paper.

Still another object of the present invention is to provide an easy assembly of the fuser by assembling the electrical material and the discharge medium into two separate frames.

It is still another object of the present invention to provide an apparatus which does not need to separate the developing unit at the time of jam removal of the recording paper.

Still another object of the present invention is to provide an apparatus which does not need to separate the developing unit when replacing the cleaning belt which is a consumable.

In order to achieve the above object, the present invention provides a fixing machine, a heating roller and a compression roller for fixing and compressing a toner image on a transferred recording paper, and a paper discharge sensor for sensing that the recording paper is discharged between the compression roller and the heating roller. And a thermistor for sensing and controlling the temperature of the heating roller, a thermal-fuse for preventing overheating of the heating roller, a cleaning-belt for removing residual toner on the surface of the heating roller, and the recording paper to the outside. It characterized in that it comprises a discharge roller for discharging, a hinge for rotating the rear frame of the fixing unit in the vertical direction, and a rocker for coupling the rear frame to the main frame.

In order to achieve the above object, the present invention provides a guide part for guiding a transferred recording paper between a compression roller and a heating roller, and a compression roller and a heating roller for fixing and compressing a toner image on the recording paper. A paper discharge sensor for detecting discharge of the recording paper between the compression roller and the heating roller, a thermistor for sensing and controlling the temperature of the heating roller, a thermal-fuse for preventing overheating of the heating roller, and A locker for coupling the rear frame of the fixing unit to the main frame is installed, and a cleaning belt for removing toner residues on the surface of the heating roller, and a discharge roller for discharging the recording paper to the outside of the fixing unit. The hinge for rotating the rear frame in the up and down direction from the main frame in the installed state as described above is fastened And that is characterized.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The image forming apparatus of the electrophotographic processor in which the fuser according to the present invention can be separated includes a photosensitive drum 14 rotating clockwise at a constant circumferential speed as shown in FIG. 2, and one side of a lower end of the photosensitive drum 14. The charger 18 is provided on the surface of the photosensitive drum 14 to uniformly charge the electric charge layer, and the other end of the lower end of the photosensitive drum 14 is electrostatically charged on the surface of the photosensitive drum 14 that is electrically charged. An exposure unit 20 for forming a latent image is provided, and one side of the photosensitive drum 14 is provided with a developing roller 22 for developing toner on an electrostatic latent image formed on the surface of the photosensitive drum 14. One side of 22) is provided with a feed roller (not shown) for transferring the toner stirred by the stirrer to the developing roller 22 side, and the toner formed on the surface of the developing roller 22 is uniformly formed at the upper end of the developing roller 22. One height A doctor blade (not shown) for regulating is provided, and an upper end portion of the photosensitive drum 14 is provided with a transfer machine 16 for transferring a toner image on the surface of the photosensitive drum 14 onto a recording paper. The other side 14) is provided with a cleaner 24 for removing the toner remaining on the surface of the photosensitive drum 14 in the state that the transfer process is completed, all the above components are installed in the developing unit 12, respectively.

In addition, a fixing unit 50 for fixing and compressing a recording sheet is provided on one side of the developing unit 12.

The fixing unit 50 has a guide portion 44 for guiding the recording paper transferred by the transfer machine 16 between the compression roller 46 and the heating roller 48 on one side of the main frame 40. One side of the guide portion 44 is provided with a compression roller 46 and a heating roller 48 for fixing and compressing the toner image on the transferred recording paper by heat and pressure, wherein the compression roller 46 The heating roller 48 is in contact with the lower end.

In addition, one side of the heating roller 48 is provided with a paper discharge sensor 28 for detecting that the recording paper is discharged between the compression roller 46 and the heating roller 48, wherein the paper discharge sensor 28 ) Detects the tip of the recording paper and prevents the next recording paper from entering the heating roller 48 and the compression roller 46 inlet.

One side of the heating roller 48 senses and controls the temperature of the heating roller 48 to turn on / off a heat lamp installed inside the heating roller 28 so that the heating roller 48 The thermistor 42 for controlling the surface temperature is installed in contact with, one side of the thermistor 42 senses the temperature to prevent overheating of the heating roller 48 to cut off the power when the temperature is above a certain temperature A fuse 38 is installed, and a rocker 26 for coupling the rear frame 36 of the fixing unit to the main frame 40 is installed at the upper end of the compression roller 46 in the direction of discharge of the recording paper. All parts such as (guide part, compression roller, heating roller, thermistor, thermal-fuse, paper discharge sensor, rocker) are installed in the main frame 40 of the fixing unit, respectively.

In addition, the fixing unit 50 is provided with a cleaning belt 34 for removing an after-image of the toner on the surface of the heating roller 48, wherein the cleaning belt 34 is the rear frame 30 is a rocker 26 ) Contact with the surface of the heating roller 48 at a constant pressure to be precisely fastened.

One side of the heating roller 48 and the compression roller 46 is installed in contact with the discharge roller 32 for discharging the recording paper to the outside, all the components (cleaning-belt, discharge roller) is a fixing machine Each of the rear frame 30 is installed.

In this case, a groove 30a is formed in the rear frame 30 to be coupled to the rocker 26, and a protrusion 26a is formed in the rocker 26 so as to be smoothly coupled to the groove 30a. .

Further, as described above, the guide part 44, the compression roller 46, the heating roller 48, the thermist 42, the thermo-fuse 38, the paper discharge sensor 28, the rocker 26 is a main- It is installed on the frame 40, the cleaning belt 34 and the discharge roller 32 is installed on the rear frame 30 to separate the rear frame 36 from the main frame 40, the upper, Hinge 36 for rotating in the downward direction (clockwise) is fastened and fixed to each other.

At this time, the angle at which the rear frame 30 rotates about the hinge 36 is installed to enable the stop control at the position for the convenience of the user.

Referring to the operation and effects of the present invention configured as described above are as follows.

The surface of the photosensitive drum 14 is electrically uniformly charged by the corona discharge of the charger 18, and the portion charged by the rotation of the photosensitive drum 14 forms an image through the exposure unit 20. When the surface of the photosensitive drum 14 is exposed by receiving an electrical signal, an electrostatic latent image is formed in a portion that receives light in an initial charged state.

At this time, the toner is agitated to have a constant charge by a stirrer and moved to the developing roller 22 side by a supply roller (not shown).

Thereafter, a toner layer is formed on the surface of the developing roller 22. At this time, the toner layer is formed on the surface of the developing roller 22 at a uniform height by regulation of a doctor blade (not shown).

Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 14 is developed with toner while passing through the developing roller 22 to become a visible image, and then the recording paper mounted in the cassette (not shown) is fed by the paper feed roller, Thereafter, the toner image on the surface of the photosensitive drum 14 is transferred to the recording paper surface by the high pressure action of the transfer device 16.

Thereafter, the recording paper is introduced between the heating roller 48 and the compression roller 46 along the guide portion 44 provided on one side of the main frame 40 of the fixing unit.

Thereafter, the recording paper passes between the heating roller 48 and the compression roller 46, and an image is fixed on the surface of the recording paper by heat (high temperature) and pressure. The recording paper does not roll into the heating roller.

Then, when the tip of the recording paper exits between the compression roller 46 and the heating roller 48, the paper discharge sensor 28 detects this and the next sheet of recording paper to the heating roller 48 and the compression roller 46 Then, when the end of the recording paper completely exits between the heating roller 48 and the compression roller 46, the next recording paper is introduced.

Thereafter, the recording paper is transferred to the pedestal side by the rotation of the discharge roller 32, whereby desired printing is performed.

On the other hand, the toner remaining on the surface of the photosensitive drum 14 after passing the transfer machine 16 is removed by the cleaner 24.

When a recording paper jam occurs in the fixing unit 50 during the printing process as described above, when the rear frame 30 of the fixing unit is rotated clockwise (lower direction) as shown in FIG. The groove 30a formed at the lower end of the rear frame 30 is separated from the protrusion 26a formed at one side of the rocker 26 so that the main frame 40 and the rear frame 30 are easily separated.

Thereafter, the jam of the recording paper may be removed from the fixing unit 50.

Then, when the rear frame 30 is rotated counterclockwise (upper direction), the groove (30a) is fitted into the projection (26a) of the rocker 26 to the rear frame 30 and the main-frame ( 40) are coupled to each other and fixed.

Alternatively, when replacing the cleaning-belt 34 which is a consumable in the printing process as described above, if the rear frame 30 of the fixing unit is rotated clockwise (lower direction) as shown in FIG. 3, the rear frame The groove 30a formed at the lower end of the 30 is separated from the protrusion 26a formed at one side of the rocker 26 so that the main frame 40 and the rear frame 30 can be easily separated.

Then, the user just needs to replace the cleaning belt 34 which is a consumable.

Then, when the rear frame 30 is rotated counterclockwise (upper direction), the groove (30a) is fitted into the projection (26a) of the rocker 26 to the rear frame 30 and the main-frame ( 40) are coupled to each other and fixed.

The image forming apparatus of the electrophotographic processor which can be separated by the fuser according to the present invention as described above, since the rear frame of the fuser can be easily opened from the main frame by the locker, the image forming apparatus of the electrophotographic processor is electrically connected to each rear frame and the main frame. Separate the water (compression roller, heating roller, thermist, thermo-fuse, etc.) and the medium (medium roller, cleaning-belt) to make a separate assembly, and then assembled the main frame and the rear frame This is convenient, and the jam of the recording paper and the consumables are opened by opening the rear frame from the main frame when the paper jam occurs in the fixing unit and when the cleaning belt is replaced. It is easy to implement replacement of the cleaning-belt, and after the cleaning-belt replacement, the rear frame is connected to the main frame to heat the cleaning belt. It can easily be in close contact, and also the cleaning - been in close contact of the belt with a constant pressing force, yet accurate in the heating roller there is an effect that it is possible to easily remove the residual toner on the surface of the heating roller.

Claims (14)

A fixing apparatus installed in an image forming apparatus of an electrophotographic processor, wherein the fixing unit 50 includes a heating roller 48 and a compression roller 46 for fixing and compressing a toner image on a transferred recording sheet, and the recording sheet. Paper discharge sensor 28 for detecting discharge between the compression roller 46 and the heating roller 48, the thermistor 42 for sensing and controlling the temperature of the heating roller 48, and the heating roller 48 Thermal-fuse 38 to prevent overheating of the < RTI ID = 0.0 >) < / RTI > Hinge 36 for rotating the rear frame 36 of the fixing unit 50 in the vertical direction, and a rocker 26 for coupling the rear frame 36 to the main frame 40, characterized in that An image forming apparatus of an electrophotographic processor in which the fixing unit can be separated. 2. The electrophotographic processor of claim 1, wherein the angle at which the rear frame 30 is rotated about the hinge 36 is a stop control at a position for convenience of the user. Image forming apparatus. 2. An image forming apparatus according to claim 1, wherein a groove (30a) is formed in the rear frame (30) to be coupled to the rocker (26). 4. An image forming apparatus of an electrophotographic processor according to claim 3, wherein the locker (26) has a projection (26a) formed to be smoothly coupled to the groove (30a). The image forming apparatus of the electrophotographic processor according to claim 1, wherein the fixing roller (50) is installed in contact with a lower end of the compression roller (46) in the fixing unit (50). The fixing unit according to claim 1, wherein the cleaning-belt (34) is in close contact with the surface of the heating roller (48) when the rear frame (30) is fastened to the rocker (26). An image forming apparatus of an electrophotographic processor. 7. An image forming apparatus of an electrophotographic processor according to claim 6, wherein the cleaning belt (34) and the heating roller (48) are brought into close contact with each other at a constant pressure. In the fixing apparatus installed in the image forming apparatus of the electrophotographic processor, the main frame (40) of the fixing unit (50) includes a guide portion for guiding the transferred recording paper between the compression roller (46) and the heating roller (48). 44, a compression roller 46 and a heating roller 48 for fixing and compressing a toner image on the recording paper, and a sheet for detecting that the recording paper is discharged between the compression roller 46 and the heating roller 48. A discharge sensor 28, a thermistor 42 for sensing and controlling the temperature of the heating roller 48, a thermal-fuse 38 for preventing overheating of the heating roller 48, and the fixing unit 50. Rocker 26 is installed to couple the rear frame 36 of the main body to the main frame 40, and the rear frame 36 of the fixing unit 50 is cleaned to remove the residual toner on the surface of the heating roller 48. A belt 34 and a discharge roller 32 for discharging the recording paper to the outside, An image of an electrophotographic processor in which a fuser can be separated, characterized in that a hinge 36 for fastening the rear frame 36 in the up and down directions is fastened from the main frame 40 in the installed state. Forming device. 9. The electrophotographic processor of claim 8, wherein the angle at which the rear frame 30 is rotated about the hinge 36 is a stop control at a position for convenience of the user. Image forming apparatus. 9. An image forming apparatus according to claim 8, wherein a groove (30a) is formed in the rear frame (30) to be coupled to the rocker (26). The image forming apparatus of the electrophotographic processor according to claim 10, wherein the locker (26) is provided with a projection (26a) to be smoothly coupled to the groove (30a). 9. The electrophotographic processor image forming apparatus according to claim 8, wherein the fixing roller (50) is installed in contact with a lower end of the compression roller (46) in the fixing unit (50). The fixing unit according to claim 8, wherein the cleaning-belt (34) is in close contact with the surface of the heating roller (48) when the rear frame (30) is fastened to the rocker (26). An image forming apparatus of an electrophotographic processor. 14. An image forming apparatus according to claim 13, wherein the cleaning belt (34) and the heating roller (48) are brought into close contact with each other at a constant pressure.