JP2007118251A - Rotary press and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary press wherein a specified print quality is ensured even when diameter of a printing cylinder is changed. <P>SOLUTION: This rotary press 1 features the advantages where the cut-off length of a web 11 to which an image is transferred from the surface of a printing cylinder, can be changed by altering the diameters of the printing cylinders 15 and 17, and where even when the cut-off length is changed, the rotary press 1 is operated so that the number of revolutions of the printing cylinders 15 and 17 per unit time during printing is set so as to be constant. In the rotary press 1, the setting of the rate of change of a running speed of the web 11 is altered so as to allow the rate of change to be constant, when the diameters of the printing cylinders 15 and 17 are altered. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary printing press and a control method thereof, and is particularly suitable for use in a variable cut-off type rotary printing press in which a web cut-off length can be changed.

  In recent years, various variable cut-off types in which a web cut-off length (cutting length) can be changed have been proposed in commercial offset rotary printing presses (see Patent Document 1). The cut-off length of the web is changed by changing the diameter of a printing cylinder such as a plate cylinder or a blanket cylinder.

JP 2005-81557 A

In the variable cut-off type rotary printing press as described above, the peripheral speed of the printing cylinder changes as the diameter of the printing cylinder changes. When the peripheral speed of the printing cylinder changes, the web traveling speed changes, and the change rate of the web traveling speed also changes. Since the rate of change of the web running speed affects the tension applied to the web, when the rate of change of the web running speed changes, the tension applied to the web also changes.
For example, consider a case where the printing cylinder is changed from a small printing cylinder to a large printing cylinder. Even when the printing cylinder is changed to a large-diameter printing cylinder, if the operation is performed at the same rotation speed (rpm), the circumferential speed of the printing cylinder increases, and the web traveling speed (mm / s) increases accordingly. As the web running speed increases, the web running speed change rate (mm / s ² ) also increases. As the web running speed change rate increases in this way, the tension applied to the web also increases. When the tension applied to the web increases more than a predetermined value, there is a problem in that the printing is subject to a double or misregistration, which adversely affects the print quality. Further, when the tension applied to the web is significantly increased, the web may be cut.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a rotary printing machine and a control method thereof that can ensure a constant print quality even when the diameter of a printing cylinder is changed. .

In order to solve the above-described problems, the printing machine and the control method thereof according to the present invention employ the following means.
That is, in the rotary printing press according to the present invention, the cut-off length of the web to which the image on the printing cylinder is transferred can be changed by changing the diameter of the printing cylinder, and even when the cut-off length is changed, printing can be performed. In a rotary printing press operated with the rotation speed per unit time of the printing cylinder being substantially constant, when the diameter of the printing cylinder is changed, the rate of change in the running speed of the web is constant. The change rate setting is changed.

When changing the cut-off length of the web printed by the rotary printing press, the diameter of the printing cylinder is changed. Even if the diameter of the printing cylinder is changed, if printing is performed in a state where the rotation speed (rpm) is substantially constant, the circumferential speed of the printing cylinder, that is, the running speed (mm / s) of the web changes. For example, when the diameter is changed to a large body diameter, the web traveling speed increases. As the web travel speed changes, the web travel speed change rate (mm / s ² ) also changes. When the web running speed change rate changes, the tension applied to the web changes.
When the tension applied to the web is changed in this way, the print quality is affected by double or misregistration.
In the present invention, the setting of the rate of change is changed so that the rate of change in web running speed is constant, so that the rate of change in web running speed does not change even when the body diameter is changed. Thereby, the tension applied to the web does not fluctuate significantly with changes in the web traveling speed, and a printed matter with stable quality can be output.
In the case of an offset rotary printing press, the printing cylinder and the blanket cylinder correspond to the printing cylinder.

  Furthermore, when the diameter of the printing cylinder is changed from the first diameter to another diameter, the rotary printing press according to the present invention stores a set value for the first diameter as a first diameter set value, and When the diameter of the cylinder is returned to the first diameter, the first diameter setting value is set as a preset value.

When the diameter of the printing cylinder is returned to the first diameter, the first diameter setting value is set as the preset value, so that it is possible to quickly prepare for printing with the first diameter.
Examples of set values include the phase of the saw blade of the folding machine, the phase and position of the impeller, and the like.

  Furthermore, the rotary printing press according to the present invention includes a control unit that changes the rate of change of the rotational speed of a rotating body such as the printing cylinder so that the rate of change of the traveling speed of the web is changed. Features.

The rate of change (rpm / s) in the rotational speed of a rotating body (drag roller) such as a printing cylinder or an infeed roller that runs the web is changed so that the rate of change in web running speed (mm / s ² ) is obtained. By realizing this by the control unit, the change of the web traveling speed according to the change of the cut-off length is performed quickly and reliably.
Note that the control unit may include a value of a rotational speed change rate (rpm / s) for each diameter of the printing cylinder, and may detect a change in the diameter of the printing cylinder and automatically change the set value. . It is also possible to provide a relational expression between the cut-off length or the diameter of the printing cylinder and the rotational change rate, and to automatically set the rotational speed change rate obtained based on this relational expression.

  Furthermore, the rotary printing press of the present invention is characterized in that the phase of the printing cylinder is adjusted so that the web is cut between printed images transferred to the web even when the cut-off length is changed. And

  Even if the cut-off length is changed, the printing cylinder diameter changes, but the printing position of the printing cylinder with respect to the web and the cutting position (cutting position) of the folding machine do not change. Therefore, even after the cutoff length is changed, the path length from the printing position to the cutting position is constant. Therefore, when the cut-off length is changed, the cutting position between the printed images transferred to the web is changed. In the present invention, by adjusting the phase of the printing cylinder, the cutting position can be made constant regardless of the change in the cut-off length.

  Furthermore, the rotary printing press of the present invention includes an ink supply device that supplies ink to the printing cylinder, and the ink supply device changes an ink supply amount in accordance with a web traveling speed.

When the web running speed is changed by changing the diameter of the printing cylinder, the ink consumption per unit time is also changed. In the present invention, since the ink supply amount is changed according to the web running speed, the print quality is kept constant even if the diameter of the printing cylinder is changed.
For example, since the web running speed increases as the diameter of the printing cylinder increases, the ink supply amount is controlled to increase.
Note that, similarly to the ink supply amount, it is preferable to similarly control the dampening water supply device and the silicon coating device in which the supply amount changes according to the web traveling speed.

  Furthermore, the rotary printing press of the present invention has a substantially constant web travel speed regardless of the change in the diameter of the printing cylinder in the slow speed mode in which the web travel speed is low for maintenance or the like. It is characterized by that.

  In the slow motion mode, operations such as maintenance and paper feeding are performed. At this time, since the web traveling speed is constant even when the diameter of the printing cylinder is changed, the operator can perform a predetermined work in a normal working time without being aware of the change of the diameter of the printing cylinder. it can. Therefore, smooth work is realized.

  Further, according to the control method of the rotary printing press of the present invention, the cut-off length of the web to which the image on the printing cylinder is transferred can be changed by changing the diameter of the printing cylinder, and even when the cut-off length is changed. In the control method of a rotary printing press operated with the rotation speed per unit time of the printing cylinder during printing being substantially constant, when the diameter of the printing cylinder is changed, the rate of change in the traveling speed of the web is The setting of the change rate is changed so as to be constant.

When changing the cut-off length of the web printed by the rotary printing press, the diameter of the printing cylinder is changed. Even if the diameter of the printing cylinder is changed, if printing is performed in a state where the rotation speed (rpm) is substantially constant, the circumferential speed of the printing cylinder, that is, the running speed (mm / s) of the web changes. For example, when the diameter is changed to a large body diameter, the web traveling speed increases. As the web travel speed changes, the web travel speed change rate (mm / s ² ) also changes. When the web running speed change rate changes, the tension applied to the web changes.
When the tension applied to the web is changed in this way, the print quality is affected by double or misregistration.
In the present invention, the setting of the rate of change is changed so that the rate of change in web running speed is constant, so that the rate of change in web running speed does not change even when the body diameter is changed. Thereby, the tension applied to the web does not fluctuate significantly with changes in the web traveling speed, and a printed matter with stable quality can be output.

  Since the change rate setting is changed so that the web running speed change rate is constant, the web running speed change rate is not changed even if the body diameter is changed. The tension applied to the sheet does not fluctuate greatly, and a printed matter with stable quality can be output.

Embodiments according to the present invention will be described below with reference to FIGS.
In the present embodiment, the present invention is applied to a blanket facing rotary printing machine that performs multicolor printing on both sides of a web.
FIG. 1 is a schematic diagram showing an overall schematic configuration of an offset rotary printing press (hereinafter referred to as “rotary printing press”) 1. This rotary printing machine 1 is a variable cut-off type in which the cut-off length (cut length) of the web can be changed. The rotary printing press 1 according to the present embodiment operates at a constant rotation speed without changing the rotation speed (rpm) of the printing cylinder even when the cut-off length is changed. Thereby, even if the cut-off length is changed, a constant printing speed (number of copies / time) is realized.

  The rotary printing machine 1 includes a paper feeding device 3 that supplies a web 11, an infeed unit 2 that adjusts the tension of the web 11, a printing unit 5, a drying device 7 that dries the printed web, and a web 11. A cooling device 8 for cooling, a web path unit 10, and a folding machine 9 that cuts and folds the web 11 and discharges it as a folded book are provided.

The paper feeding device 3 is configured to hold two paper rolls 13 each having a web 11 wound in a roll shape. When paper is fed from one paper roll 13, the other paper roll 13 is mounted and paper splicing preparation is made. When the remaining web 11 of one paper roll 13 is reduced, the web 11 is spliced to the web 11 of the other paper roll 13. While the web 11 is being supplied from the other paper roll 13, one paper roll 13 is mounted, and the next paper splicing preparation is made.
In this way, the web 11 is continuously fed from the paper feeding device 3 to the printing unit 5.

  The infeed unit 2 is provided with a drive motor 2M for driving a roller 2r that feeds the web 11.

  The printing unit 5 is provided with the number of units corresponding to the number of printing colors. In the present embodiment, four printing units 5 are provided, which respectively print cyan, yellow, magenta, and violet, and perform color printing using a mixed color thereof.

Although the printing unit 5 will be described in detail later, two sets of plate cylinders 15a and 15b and blanket cylinders 17a and 17b are provided. The upper blanket cylinder 17a and the lower blanket cylinder 17b are arranged opposite to each other with the web 11 in between, and serve to apply printing pressure to each other.
In each figure, suffixes “a” and “b” after the reference numerals are for distinguishing between the upper side and the lower side of the web 11, and “a” indicates an upper part or member. , B indicates the lower side. In the following description, a and b are added when distinguishing the upper side and the lower side, but unless otherwise distinguished, a and b are omitted, and each part or member is indicated only by a reference numeral. .
Printing cylinder drive motors 17aM and 17bM are provided in the vicinity of the blanket cylinders 17a and 17b, respectively. The printing cylinder drive motors 17aM and 17bM are configured such that the rotation speed and phase are changed by a command from the control unit of the rotary printing press 1. Further, printing pressure adjusting motors 15aM and 15bM for adjusting the printing pressure of the plate cylinder 15 and the blanket cylinder 17 are provided. Although not shown in the figure, the printing pressure adjusting motor is provided between the upper plate cylinder 15a and the upper blanket cylinder 17a, between the lower plate cylinder 15b and the lower blanket cylinder 17b, and between the upper blanket cylinder 17a and the lower blanket. A total of six units are provided for each printing unit 5 between the cylinder 17 b and the operation side and the driving side.

The web 11 printed on both sides by the printing unit 5 is dried by the drying device 7, cooled by the cooling device 8, and then conveyed to the folding machine 9 through the web path unit 10.
The cooling device 8 is provided with a drive motor 8M that drives each roller 8r for feeding the web 11.
The web path unit 10 is provided with a drive motor 10M that drives each roller 10r for feeding the web 11.
In the folding machine 9, the conveyed web 11 is longitudinally cut, vertically folded by a triangular plate, further horizontally folded and laterally cut, and discharged as a desired folded book. The folding machine 9 is also provided with various motors, which will be described later.

The drive motor 2M of the infeed unit 2, the printing cylinder drive motors 17aM and 17bM of the printing unit 5, the drive motor 8M of the cooling device 8, the drive motor 10M of the web path unit 10, and the drive motor of the folding machine 9 (described later). Determines the feed speed of the web 11. That is, the tension of the web 11 is changed by these motors. Such a motor is called a main motor. In the figure, the main motor is represented by a figure with a letter “M” in a square. Therefore, when the cut-off length of the web 11 is changed, the setting of the rate of change of the rotational speed of these main motors is changed.
In contrast to the main motor, the printing pressure adjusting motors 15aM and 15bM of the printing unit 5 are referred to as auxiliary motors. In the figure, the auxiliary motor is represented by a figure with a letter “M” in a circle.
The main motor and the auxiliary motor are servo motors whose rotational speed and phase are controlled based on a command from the control unit of the rotary printing press 1.

FIG. 2 is a schematic diagram illustrating an overall schematic configuration of the printing unit 5 of the rotary printing press 1 according to the present embodiment. The printing unit 5 is provided with printing units 6 a and 6 b on the top and bottom of the web 11, respectively. The printing units 6 a and 6 b are in a substantially plane relationship with the traveling surface of the web 11 as the center.
The printing units 6a and 6b include plate cylinders 15a and 15b equipped with printing plates for forming printed images, and ink devices 19a and 19b for supplying ink to the image line portions of the printing plates of the plate cylinders 15a and 15b. , Dampening devices 21a and 21b for supplying dampening water to the non-imaged portions of the plate cylinders 15a and 15b, and blanket cylinders 17a and 17b for transferring images formed on the printing plates of the plate cylinders 15a and 15b to the web 11. And are provided.

In the rotary printing press 1 of the present embodiment, the plate cylinders 15a and 15b and the blanket cylinders 17a and 17b can be changed to those having different diameters, as indicated by solid lines and two-dot chain lines in FIG. . In this way, for example, it is possible to perform printing of A horizontal full size (AY) having a cutoff length of 625 mm and B vertical half trial (BT) having a cutoff length of 546 mm. Specifically, the plate cylinders 15a and 15b and the blanket cylinders 17a and 17b are composed of a base roller and an endless cylindrical sleeve covering the outer periphery thereof, and are changed to sleeves having different outer diameters (thicknesses). By changing the diameter of the trunk.
Further, the axial positions of the plate cylinders 15a and 15b and the blanket cylinders 17a and 17b change in the vertical direction as the diameters of the plate cylinders 15a and 15b and the blanket cylinders 17a and 17b change.
Further, the positions of the ink form rollers 20a and 20b of the ink devices 19a and 19b and the water application rollers 22a and 22b of the dampening devices 21a and 21b are changed.

As shown in FIG. 2, the printing unit 5 is provided with printing cylinder drive motors 17aM and 17bM and printing pressure adjustment motors 15aM and 15bM.
Drive motors 20aM and 20bM for driving the roller groups of the inking devices 19a and 19b are provided in the vicinity of the ink form rollers 20a and 20b.
Drive motors 23aM and 23bM are provided in the vicinity of the ink source rollers 23a and 23b of the inking devices 19a and 19b, and the rotation speed (rpm) of the ink source roller is controlled by the drive motors 23aM and 23bM.
Drive motors 25aM and 25bM are provided in the vicinity of the water source rollers 25a and 25b of the dampening devices 21a and 21b, and the rotational speed (rpm) of the water source rollers 25a and 25b is controlled by the drive motors 25aM and 25bM. Is done.

FIG. 3 shows the relationship between the printing cylinder drive motors 17aM and 17bM and the drive motors 20aM and 20bM of the inking device 19 shown in FIG.
The gears 17aG and 17bG of the printing cylinder drive motors 17aM and 17bM mesh with the blanket cylinder intermediate gears 30aG and 30bG. The blanket cylinder intermediate gears 30aG and 30bG mesh with blanket cylinder gears 17aG and 17bG that drive the blanket cylinders 17a and 17b. Further, the blanket cylinder intermediate gears 30aG and 30bG mesh with the plate cylinder intermediate gears 31aG and 31bG.
The plate cylinder intermediate gears 31aG and 31bG mesh with plate cylinder gears 15aG and 15bG for driving the plate cylinders 15a and 15b.
In this way, the printing cylinder composed of the plate cylinder 15 and the blanket cylinder 17 is driven by the printing cylinder drive motors 17aM and 17bM.
The plate cylinder gears 15aG and 15bG are not meshed with the blanket cylinder gears 17aG and 17bG.

  The gears 20aG and 20bG of the inking device drive motors 20aM and 20bM mesh with the gears 19aG that drive the respective ink rollers. Thereby, each ink roller is driven by the inking device drive motors 20aM and 20bM.

As described above, the printing unit 5 includes the two printing cylinder drive motors 17aM and 17bM and the two inking device drive motors 20aM and 20bM. Accordingly, there is no need for a clutch for switching the transmission of the driving force between the printing cylinders 15 and 17 and the inking device 19, which is required in the conventional configuration in which the printing cylinders 15 and 17 and the inking device 19 are driven by one motor. become. Thereby, cost reduction is realized.
Further, since the upper and lower printing cylinders 15 and 17 can be driven by the separate drive motors 17aM and 17bM, the printing displacement in the vertical direction (printing direction) can be adjusted independently.
Further, since the printing cylinder drive motors 17aM and 17bM and the inking device drive motors 20aM and 20bM are separated and the plate cylinder 15 and the ink form rollers 20a and 20b are driven independently, respectively, By rotating the ink form rollers 20a and 20b slightly (2 to 3%) slowly, the ink form rollers 20a and 20b can be stably rolled with respect to the plate cylinder 15.

FIG. 4 shows details of the folding machine 9 shown in FIG.
Downstream of the triangular plate 40, a pair of nipping rollers 42, a pair of horizontal sewing rollers 44, a first web cutting device 46, and a second web cutting device 48 are provided in this order.
The triangular plate 40 folds the web 11 in half along the width direction (printing direction). The folded web 11 is sent to the nipping roller 42 and is sandwiched and pressed between the opposing nipping rollers 42. Thereby, a crease in the vertical direction (printing direction) is reliably given to the web 11. The nipping roller 42 is driven by a drive motor 42M.
The web 11 sent by the nipping roller 42 is sent to the horizontal sewing roller 44, and a perforation is formed in the width direction of the web 11. The horizontal sewing roller 44 is driven by a drive motor 44M.
The web cutting devices 46 and 48 cut the web 11 with a predetermined cut-off length. Each web cutting device 46 is composed of an opposing saw cylinder and receiving cylinder, and the web 11 is cut by a knife provided on the saw cylinder. The first cutting device 46 cuts into a perforated shape, and the second cutting device 48 finally cuts it. The phases of the cutting devices 46 and 48 are changed according to the cut-off length of the web 11, and are changed by phase adjusting motors 46M and 48M, respectively.

A conveyor belt device 50 and a crease device 52 are provided downstream of the second cutting device 48M.
The conveyor belt device 50 is a device that feeds the cut web 11 while being sandwiched between endless belts 51a and 51b. Further, the transport belt device 50 has a function of increasing the speed after receiving the web 11 and sending it to the downstream folding device 52. The conveyor belt device 50 is driven by drive motors 51aM and 51bM having a speed change cam.

The tail folding device 52 holds the web 11 at a substantially intermediate position in the transport direction and gives a crease perpendicular to the transport direction to fold it in half. The tail folding device 52 is provided with a drive motor 52M1 for driving each cylinder and a phase adjustment motor 52M2 for adjusting the phase.
In the tail folding device 52, two sets of folding books are formed by one rotation of the cylinder. For this reason, the web 11 is accelerated by the conveyor belt device 50.
On the downstream side of the tail-folding device 52, a lap reference position adjusting motor 53M for adjusting the wrap amount (the amount of protrusion) of the folded web 11 (folded book) is provided.
The signature formed by the tail folding device 52 is sent to the right angle impeller 54. By means of the right-angle impeller 54, the folded books are sent one by one to the downstream side, and are sent in a state of being tiled by a downstream conveyor (not shown). The right angle impeller 54 is rotationally driven by a drive motor 54M.
In the case of parallel folding, the web 11 (folding paper) is not sent to the right-angle impeller 54 but is discharged as it is.

The operation of changing the cut-off length of the web 11 of the rotary printing press 1 configured as described above is operated as follows.
The operator switches the cut-off length (see FIGS. 5 and 6), adjusts the printing pressure of the printing unit 5 (see FIGS. 7 and 8), and replaces the printing cylinder sleeve and the blanket cylinder sleeve of the printing unit 5. (Refer to FIGS. 9 and 10) are commanded on the touch panel attached to the rotary printing press 1.

FIG. 5 shows a screen configuration of a touch panel that switches the cut-off length.
As shown in the upper right of the screen, “Cutoff switching mode”, “Extractor simultaneous activation” corresponding to sleeve replacement, and “Cutoff switching (printing pressure setting)” corresponding to printing pressure adjustment. There are two buttons, and by selecting one of these buttons, one of the above three operations is performed. In the screen of FIG. 5, “cut-off switching mode” is selected.

  When switching the cut-off length, the operator presses “unlock” at the right end of the screen, selects a cut-off length corresponding to either 546 mm or 625 mm, and presses “switch start”. On the left side of the screen, an “operation completion monitor” indicating the operation state of each device is displayed.

When the cut-off length is selected (step S0), as shown in FIG. 6, the control unit of the rotary printing press 1 determines whether the machine is in a stopped state, that is, whether the rotary printing press 1 is stopped. Judgment is made (step S1). If it is determined in step S1 that the machine, that is, the rotary printing press 1, is stopped, the process proceeds to the next step S2. In step S2, it is determined whether or not the protector of the folding machine 9 is fully closed. If the protector is fully closed, the process proceeds to the next step S3.
In step S3, it is confirmed that “unlock” and “start” operations have been performed. If this is confirmed, the process proceeds to the next step S4.

  In step S4, the phase and position (first diameter setting value) of each device of the folding machine 9 in the diameter (first diameter) of the printing cylinders 15 and 17 before changing the cut-off length are stored in the memory of the control unit. To do. Specifically, the phase adjusting motors 46M and 48M of the web cutting devices 46 and 48 of the folding machine 9, the phase of the drive motors 51aM and 51bM having the speed change cam of the conveying belt device 50, and the phase adjusting motor of the tail folding device 52 are shown. 52M, the phase of the lap amount reference positioning motor 53M, the phase of the right-angle impeller 54M, and the like are stored in the control unit.

Next, it is determined whether or not the folding machine 9 is connected to another part. The other parts refer to devices that are independently operated, such as the printing unit 5, the cooling device 8, and the web pass unit 10 shown in FIG.
If the folding machine 9 is connected, the process proceeds to step S6, and the defective paper in the folding machine 9 is automatically discharged. When the discharge of the defective paper is completed (step S7), the process proceeds to the next step S8.
If the folding machine 9 is not connected (individually), the process proceeds to step S8 as it is.

The steps after step S8 are shown to be processed in order in FIG. 6, but they are processed in parallel almost simultaneously.
In step S8, along with the change of the cut-off length, the paper feed parameter is changed based on the circumferential length of the saw cylinder provided in the cutting devices 46 and 48 of the folding machine 9. As a result, the paper splicing timing in the paper feeder 3 (see FIG. 1) is changed. This is because when the paster (paper splicing) position coincides with the cutting position of the folding machine 9 or the position of the paper folding device 52 (see FIG. 4), it is likely to cause a paper jam. It adjusts so that the positions of do not match.
In step S9, the paper feed parameter (path length correction) is changed. That is, the paper feeding phase is adjusted based on the path length from the paper feeding position of the paper feeding device 3 to the web cutting devices 46 and 48 of the folding machine 9. This is because when the cut-off length is changed, the value obtained by dividing the path length by the cut-off length is not an integer value, so that the cut position is not set to a desired position. Accordingly, the sheet feeding phase is adjusted so that the value obtained by dividing the path length by the cut-off length after the change becomes an integer value so that the cutting is performed at an appropriate position.
Through the steps S8 and S9, the tail control timing at which the paper splicing is performed in the paper feeding device 3 is appropriately changed.

  In step S10, the moving pulse amount for the top and bottom register is changed. When the diameters of the printing cylinders 15 and 17 are changed in accordance with the change in the cut-off length, the circumferential movement amount (mm) per unit rotation angle (°) of the printing cylinders 15 and 17 changes. In the printing unit 5, the vertical direction (printing direction) is adjusted by the printing cylinder drive motors 17aM and 17bM. Therefore, the movement pulse amount applied to the printing cylinder drive motors 17aM and 17bM is set to the diameter of the printing cylinders 15 and 17. Change the value accordingly. Thereby, even if it is a case where cutoff length is changed, the registration of the top-and-bottom direction (printing direction) of printed matter can be adjusted appropriately.

In step S11, the functions for determining the supply amounts of the inking device 19 and the dampening device 21 (see FIG. 2) are switched. Specifically, the functions of the rotational speed given to the drive motors 23aM and 23bM of the ink source rollers 23a and 23b and the drive motors 25aM and 25bM of the water source rollers 25a and 25b are changed.
In order to realize stable printing quality of the dampening device 21, it is preferable that the ink supply amount of the inking device 19 and the water supply amount of the dampening device 21 are changed in proportion to the traveling speed of the web 11. Even if the diameters of the printing cylinders 15 and 17 are changed in accordance with the change in the cut-off length, the rotation speed is maintained at the same rotation speed (rpm) after the change in the cut-off length in order to maintain the printing speed (number of copies / hour). When the printing cylinders 15 and 17 are changed, the traveling speed of the web 11 changes greatly. Therefore, the supply functions of the inking device 19 and the dampening device 21 are switched so that the supply amount per unit travel distance of the web 11 becomes constant according to the change in the cut-off length.
In addition, when the rotary printing machine 1 is provided with the silicon | silicone coating apparatus, the silicon supply amount is adjusted similarly.

  In step S12, the phase offset amount of the printing cylinders 15 and 17 is changed based on the distance from the folding machine 9 to the printing unit of the printing unit 5 (specifically, the nip position between the blanket cylinders 17a and 17b). The distance from the nip position of the blanket cylinder 17 to the web cutting devices 46 and 48 of the folding machine 9 does not change even if the cut-off length is changed. However, since the peripheral lengths of the printing cylinders 15 and 17 are changed with the change of the cut-off length, the cutting position (cutting position) of the folding machine 9 may not be a desired cutting position. Specifically, before the cut-off length is changed, the value obtained by dividing the distance from the nip position of the blanket cylinder 17 to the cut position of the folding machine 9 by the cut-off length is an integer value. If changed, dividing the distance by the cut-off length does not always result in an integer value. In this case, the print (image) area is cut, resulting in an increase in waste paper. Therefore, in accordance with the change in the cut-off length, the phase offset amounts of the printing cylinders 15 and 17 are changed so that the distance becomes an integer value even if the distance is divided by the cut-off length after the change. As a result, the web 11 is cut at an appropriate position.

In steps S14 to S17, the value (first diameter setting value) stored in step S4 is read, and the value used during the previous operation with the same cutoff length is set as a preset value. In step S14, the phase of the lap reference position determining motor 52 is preset. In step S15, the phases of the first saw cylinder and the horizontal sewing machine of the first web cutting device 46 are preset. In step S16, the phase of the leading edge cam provided in the tail folding device 52 (phase of the phase adjusting motor 52M2) is preset. In step S17, the position of the center of the right-angle impeller 54 is preset.
In step S18, the timing function of a chopper (not shown) provided in the folding machine 9 is switched. Since the timing at which the web 11 is struck by the chopper differs according to the cut-off length, an appropriate position according to the cut-off length is set.

In step S19, the acceleration of the virtual master (that is, the rate of change in the rotational speed of the rotating body such as the printing cylinders 15 and 17) is switched. The virtual master is a signal serving as a reference for a speed command instructing each main motor such as a drive motor of the infeed unit 2. The acceleration of the virtual master is changed according to the change in the cut-off length. Specifically, when the cut-off length changes, the traveling speed of the web 11 changes. When the web running speed (mm / s) changes, the web running speed change rate (mm / s ² ) also changes. When the web running speed change rate, that is, the acceleration changes, the tension of the web 11 changes, which adversely affects the print quality. Therefore, the acceleration of the virtual master corresponding to the cutoff length is switched so that the tension applied to the web 11 is constant even when the cutoff length is changed. Thereby, even if the cut-off length is changed, the state of the tension applied to the web 11 is not significantly changed, so that stable print quality is realized.
For example, the cutoff length at AY (625 mm) is la, the cutoff length at BT (546 mm) is lb, the acceleration at AY is αa (rpm / s), and the acceleration at BT is αb (rpm / s). Then
αa = (lb / la) × αb
The acceleration of the virtual master is given by the relational expression given by

  In step S20, the rotation speed given in the slow speed mode in which the web traveling speed is low is switched in order to perform maintenance such as paper (web) threading and cleaning of the blanket cylinder 17. That is, even if the cut-off length is changed, the slow speed is switched so as to be constant. Specifically, it is 10 rpm during AY and 12 rpm during BT. Thus, even if the cut-off length is changed, the web traveling speed is made constant, so that the operator can perform a predetermined work in a normal work time without being aware of the change of the cut-off length.

  In step S21, the plate attachment / detachment position of the plate cylinder 15 of each printing unit 5 is switched. Along with the change in cut-off length, the plate mounting (winding start position, winding end position) and removal (unwinding position, removal position) positions are switched.

  In step S22, the electronic gear ratio of the drag roller is switched. The drag roller means a roller that pulls and conveys the web 11, such as the drive roller 2 r of the infeed unit 2. The peripheral speed of each drag roller is determined based on the electronic gear ratio given from the control unit of the rotary printing press 1. Since the circumferential speed of each roller is changed by changing the cut-off length, the electronic gear ratio given from the control unit is changed according to the cut-off length so as to follow the change.

  In step S23, the drive patterns of the belts 51a and 51b of the conveyor belt device 50 of the folding machine 9 are calculated and switched. In the conveyor belt device 50, the cut web 11 is accelerated and delivered to the folding device 52. Since this acceleration pattern changes as the cut-off length is changed, the drive patterns of the belts 51a and 51b corresponding to the cut-off length are calculated and switched.

Next, the printing pressure adjustment operation of the printing unit 5 will be described with reference to FIGS.
The operator presses “unlock” on the touch panel shown in FIG. 7 and selects the cutoff length (546 mm or 625 mm) to be changed (step S30 in FIG. 8). Then press “Start”.
Then, the actuator is driven for each printing unit 5 (step S31). And it waits until the printing cylinders 15 and 17 move to the position according to the cut-off length, and the operation is completed after the movement is completed and the printing pressure is adjusted.
The printing pressure adjustment can be performed at the same time for all the units, or can be performed for each printing unit 5 (P1 to P4).

Next, with reference to FIGS. 9 and 10, the operation of exchanging the plate cylinder sleeve and the blanket cylinder sleeve of the printing unit 5 will be described.
The operator presses “unlock” on the touch panel shown in FIG. 9 and selects the printing unit 5 of the color (P1 to P4) for which the sleeve is exchanged. Alternatively, after pressing “Unlock”, the “Select All Colors” button is pressed. Then press the “Start” button.
Then, as shown in step S40 in FIG. 10, the operator presses a “remove” button provided in the vicinity of the extractor which is a device for moving the frame holding the sleeve.
In step S41, the printing cylinders 15 and 17 are independently rotated with respect to the selected printing unit 5 until the sleeve can be detached.
Then, the extractor, which is a device for moving the frame holding the sleeve, operates to move the frame to a position where the sleeve can be removed (step S42).
In step S43, the process waits until the extraction operation of the extractor is completed. When the extraction operation is completed, the process proceeds to step S44.
In step S44, the operator manually replaces the sleeve.
In step S45, the “extractor attachment” button located in the vicinity of the extractor is pressed to operate the extractor to return the frame to the original position (step S46).

The rotary printing press according to the present embodiment described above has the following operational effects.
The change rate setting is changed so that the web running speed change rate is constant, so that the web running speed change rate does not change even if the diameters of the printing cylinders 15 and 17 are changed (step of FIG. 6). 19). Thereby, the tension applied to the web 11 does not fluctuate significantly as the web traveling speed changes, and a printed matter with stable quality can be output.
Further, when the diameters of the printing cylinders 15 and 17 are returned to the diameters used before, parameters such as the phase used before (for example, the phase of the web cutting device of the folding machine 9) are set as preset values. (See steps S14 to S17 in FIG. 6), it is possible to quickly prepare for printing after changing the cutoff length.
Further, the rotating body that travels the web 11 such as the printing cylinders 15 and 17 and the infeed roller 2r by changing the acceleration of the virtual master so that the rate of change (mm / s ² ) of the traveling speed of the web 11 is constant. Since the change rate (rpm / s) of the rotation speed of the (drag roller) is changed (step S19 in FIG. 6), the web running speed can be changed quickly and reliably in accordance with the change in the cut-off length. it can.
Since the phases of the printing cylinders 15 and 17 are adjusted when the cut-off length is changed (see step S12 in FIG. 6), the cutting position can be made constant regardless of the change in the cut-off length.
Even if the cut-off length is changed, the ink supply amount and the water supply amount are changed according to the web running speed (see step S11 in FIG. 6), so that the print quality can be kept constant.

It is the schematic which showed the whole rotary printing machine of this invention. It is the schematic which showed the printing unit of FIG. It is the side view which showed the relationship between a printing cylinder drive motor, an ink apparatus drive motor, and each gear. It is the side view which showed schematic structure of the folding machine. It is the figure which showed the screen structure of the touchscreen at the time of switching of cut-off length. It is the flowchart which showed the operation | movement at the time of switching of cut-off length. It is the figure which showed the screen structure of the touch panel of printing pressure adjustment. It is the flowchart which showed the operation | movement of printing pressure adjustment. It is the figure which showed the screen structure of the touchscreen which replaces | exchanges a sleeve. It is the flowchart which showed the operation | movement of replacement | exchange of a sleeve.

Explanation of symbols

1 Rotary press (printing machine)
5 Printing unit 9 Folding machine 11 Web 15 Plate cylinder (printing cylinder)
17 Blanket cylinder (printing cylinder)

Claims (7)

By changing the diameter of the printing cylinder, the cut-off length of the web to which the image on the printing cylinder is transferred can be changed,
Even when the cut-off length is changed, in a rotary printing press that is operated with the rotation speed per unit time of the printing cylinder during printing being substantially constant,
A rotary printing press characterized by changing the setting of the change rate so that the change rate of the running speed of the web is constant when the diameter of the printing cylinder is changed. When changing the diameter of the printing cylinder from the first diameter to another diameter, a set value for the first diameter is stored as a first diameter set value;
The rotary printing press according to claim 1, wherein when the diameter of the printing cylinder is returned to the first diameter, the first diameter setting value is set as a preset value. The control part which changes the rate of change of the number of rotations of rotating bodies, such as the above-mentioned printing cylinder, is provided so that it may become the rate of change of the running speed of the changed said web. Rotary printing machine. The phase of the printing cylinder is adjusted so that the web is cut between printed images transferred to the web even when the cut-off length is changed. A rotary printing machine as described in 1. An ink supply device for supplying ink to the printing cylinder;
The rotary printing press according to any one of claims 1 to 4, wherein the ink supply device changes an ink supply amount according to a web traveling speed. 6. The web travel speed is substantially constant regardless of a change in the diameter of the printing cylinder in the slow speed mode in which the web travel speed is low for maintenance or the like. A rotary printing press according to any one of the above. By changing the diameter of the printing cylinder, the cut-off length of the web to which the image on the printing cylinder is transferred can be changed,
Even when the cut-off length is changed, in the control method of a rotary printing press operated with the rotation speed per unit time of the printing cylinder during printing being substantially constant,
A control method for a rotary printing press, characterized in that when the diameter of the printing cylinder is changed, the setting of the change rate is changed so that the change rate of the running speed of the web becomes constant.

Images