JP3497804B2 - Stencil printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine having a plurality of plate cylinders and capable of multicolor printing.

[0002]

2. Description of the Related Art A stencil printing apparatus of the first conventional example of this type is shown in FIG. 9, and FIG. 9 is a partial schematic diagram of the stencil printing apparatus.

In FIG. 9, a first plate cylinder 101, a second plate cylinder 102 and a paper cylinder 103 are rotatably arranged in an apparatus main body (not shown). 102
Is the cylinder 103 that is about 90 degrees apart from the center angle of the cylinder 103.
Are close to the positions of the outer peripheral surface. 1st edition body 1
01 and the second plate cylinder 102 on each outer peripheral surface,
a and 102a are provided, and the plate seat portions 101a and 102a are provided.
Paper sheet clamp parts 101b and 102b for clamping a stencil sheet (not shown) are provided in a.

Further, on the outer peripheral surfaces of the first plate cylinder 101 and the second plate cylinder 102, plate seat portions 101a and 102a and a spring 104 are provided.
The respective screens 105 are stretched by utilizing the, and each of the screens 105 is composed of, for example, a mesh structure that allows the passage of ink. First edition body 10
Intermediate press rolls 106 and 107 are provided in the inner spaces of the screens 105 of the first and second plate cylinders 102, respectively. The intermediate press rolls 106 and 107 press the screen 105 at a standby position where the screen 105 is not pressed and a press position where the screen 105 is pressed. Moved between positions. During the printing operation, the middle press rolls 106 and 107 are located at the pressing position,
At the pressed position, the screen 105 bulges outward.
Further, the ink of the first color is transferred to the screen 105 on the side of the first plate cylinder 101 via the intermediate press roll 106,
The screen 105 on the side is configured to be supplied with the ink of the second color via the intermediate press roll 107. A paper clamp unit 109 capable of clamping the leading end of the printing paper 108 is provided on the outer peripheral surface side of the paper cylinder 103. The leading end of the printing paper 108 fed from the paper feeding unit 110 is clamped, and the paper ejection unit 111 is provided. Unclamp near the entrance of the.

Next, a schematic operation of printing will be described.

The front end of a stencil sheet (not shown) made on the basis of the image data for the first color is made by the original paper clamp portion 101b of the first plate cylinder 101 on the basis of the image data for the second color. The front ends of the stencil sheets (not shown) thus formed are clamped by the stencil sheet clamp portion 102b of the second plate cylinder 102 and mounted on the outer peripheral surface of each screen 105. Next, in the direction indicated by the arrow in FIG. 9, the first plate cylinder 101 and the second plate cylinder 10
2 and the paper cylinder 103 are rotated in synchronization, and in this state, the first
The printing paper 108 is conveyed from the paper feed unit 110 between the plate cylinder 101 and the paper cylinder 103. This conveyed printing paper 10
8 is clamped by the paper clamp portion 109 of the paper cylinder 103, and passes between the first plate cylinder 101 and the paper cylinder 103 along the outer peripheral surface of the paper cylinder 103. During this passage, the intermediate press roll 106 presses the screen 105 and the screen 105
Is bulged outward, and the ink image of the first color is transferred to the printing paper 108 through the perforations of the stencil sheet (not shown).
Printing paper 1 passing between the first plate cylinder 101 and the paper cylinder 103
08 is conveyed between the second plate cylinder 102 and the paper cylinder 103, and the printing paper 108 passes between the second plate cylinder 102 and the paper cylinder 103. During this passage, the intermediate press roll 10 is also used.
7 presses the screen 105 to transfer the second color ink image. Then, the paper clamp portion 10 of the paper cylinder 103
When 9 is rotated near the entrance of the paper output unit 111, the paper clamp unit 109 unclamps, and the unclamped print paper 108 is discharged to a predetermined position by the paper output unit 111. As described above, two-color printing is performed.

A stencil printing apparatus of the second conventional example is shown in FIG. 10, and FIG. 10 is a partial schematic configuration diagram of the stencil printing apparatus.

In FIG. 10, a first plate cylinder 101 and a second plate cylinder 102 are rotatably provided in an apparatus main body (not shown), and outer peripheries of the first plate cylinder 101 and the second plate cylinder 102. Plate seat portions 101a and 102a are provided on the surface, and base paper clamp portions 101b and 102b for clamping a stencil base paper (not shown) are provided on the plate seat portions 101a and 102a. Further, the outer peripheral surface portions of the first plate cylinder 101 and the second plate cylinder 102 other than the plate seat portions 101a and 102a are each formed of a porous structure that allows ink to pass therethrough, and the first plate cylinder 101 and the second plate cylinder 102 are formed. No. 1 in each outer peripheral surface in the inner space of
Means for supplying the color ink and the second color ink are respectively provided. Also, the first plate cylinder 101 and the second plate cylinder 1
Outer rolls 120 and 121 are rotatably provided at respective lower positions of 02. Each of the outer rolls 120 and 121 includes a first plate cylinder 101 and a second plate cylinder 102.
10 is moved between a standby position where the outer peripheral surface is not pressed (solid line position in FIG. 10) and a pressing position where it is pressed (phantom line position in FIG. 10). During printing operation, each outer roll 120, 12
1 is located at the pressing position. The paper feed unit 122 is the first plate cylinder 1.
01 and the outer roll 120, the printing paper 108 is fed, and the paper ejection unit 123 receives the printing paper 108 ejected from between the second plate cylinder 102 and the outer roll 121, and ejects it to a predetermined position. To do.

Next, a schematic operation of printing will be described.

The front end of a stencil sheet (not shown) made on the basis of the image data for the first color is made by the original paper clamp portion 101b of the first plate cylinder 101 on the basis of the image data for the second color. The leading end of the stencil sheet (not shown) is clamped by the stencil sheet clamp portion 102b of the second plate cylinder 102 and mounted on the outer peripheral surface portions of the first plate cylinder 101 and the second plate cylinder 102, respectively. Next, the outer rolls 120 and 121 located at the pressing position together with the first plate cylinder 101 and the second plate cylinder 102 are synchronously rotated in the direction indicated by the arrow in FIG. The printing paper 108 is conveyed from the paper feed unit 122 between the outer roll 120 and the outer roll 120. The conveyed printing paper 108 obtains a conveying force by the rotation of the first plate cylinder 101 and the outer roll 120, and the first plate cylinder 1
01 and the outer roll 120.

During this passage, the pressing force of the outer roll 120 transfers the ink image of the first color onto the printing paper 108 through the perforations of the stencil sheet (not shown). The printing paper 108 that has passed between the first plate cylinder 101 and the outer roll 120 is conveyed between the second plate cylinder 102 and the outer roll 121, and the printing paper 108 passes between the second plate cylinder 102 and the outer roll 121. Second, by obtaining the carrying force by the rotation of
It passes between the plate cylinder 102 and the outer roll 121.
At the time of this passage, the second color ink image is similarly transferred by pressing the outer roll 121. Then, the printing paper 108 that has passed between the second plate cylinder 102 and the outer roll 121 is discharged to a predetermined position by the paper discharge unit 123. As described above, two-color printing is performed.

By the way, in multi-color printing like the stencil printing apparatus of the first and second conventional examples, the printing position itself on the printing paper 108 is freely adjustable, and the printing position of the first plate cylinder 101 and It is necessary to adjust the printing position of the second plate cylinder 102 to be the same position.

Therefore, the first plate cylinder 101 side and the second plate cylinder 1 side
On the 02 side, right and left position adjusting means (not shown) for adjusting the printing position in the direction orthogonal to the paper carrying direction and top and bottom position adjusting means (not shown) for adjusting the printing position in the paper carrying direction are respectively provided. . Then, for example, when it is desired to correct the print color shift in the left-right direction of the print paper 108, the print color shift is adjusted by driving one or both of the left-right position adjusting means. When it is desired to adjust the print position itself, both the left and right position adjusting means are driven in the same direction by the same amount to adjust the print position in the left and right direction. The print color shift in the top-bottom direction of the print paper 108 and the top-bottom print position itself can be adjusted in the same manner.

[0014]

However, in the stencil printing apparatus, it is general to perform the above-mentioned printing position adjustment while observing the actual printed matter while performing the printing operation, and the printing position is adjusted during the printing operation. Is adjusted, there is a time difference between the print timing of the first plate cylinder 101 and the print timing of the second plate cylinder 102, so that the following problem occurs. That is, in the first conventional example, the first plate cylinder 10
1 and 2nd printing cylinder 102
Since there is a time difference corresponding to a rotation phase difference of 90 degrees when the rotation angle is 03, both left and right position adjusting means are set in the same direction when it is desired to adjust the left and right printing positions themselves instead of the color misregistration of the printing paper 108. When driven by the same amount, as shown in FIG. 11, the area from the left / right adjustment start point to the left / right adjustment end point on the first plate cylinder 101 side and the second plate cylinder 1 side.
There is a problem that the area from the left / right adjustment start point to the left / right adjustment end point on the 02 side is different, and a print misalignment range occurs. Further, when it is desired to adjust the top-bottom printing position itself rather than the color shift of the printing paper 108 and both top-bottom position adjusting means are driven in the same direction by the same amount, as shown in FIG. The area from the top-and-bottom adjustment start point to the top-and-bottom adjustment end point on the 1st plate cylinder 101 side differs from the area from the top-and-bottom adjustment start point to the top-and-bottom adjustment end point on the 2nd plate cylinder 102 side. There is a problem that it occurs.

Further, in the second conventional example, both the plate cylinders 101, 1 are set at the printing start time of the first plate cylinder 101 and the second plate cylinder 102.
Since there is a time difference corresponding to the paper transport distance between No. 02 and No. 02, the print misalignment also occurs in the second conventional example.

Therefore, the present invention has been made to solve the above-mentioned problems, and the range of print misalignment is obtained even when a plurality of print position adjusting means are made to adjust the print positions at the same time during the printing operation. It is an object of the present invention to provide a stencil printing device that does not generate

[0017]

According to a first aspect of the present invention, a plurality of rotatable plate cylinders on which stencil sheets can be wound and mounted, and
Arranged in the proximity of each plate cylinder, a rotatable printing pressure applying member, and a paper feeding unit for feeding a print medium between the most upstream side plate cylinder and the printing pressure applying member, During the printing operation, the plurality of plate cylinders are rotated in synchronism with each other, and the print pressure is applied to the print medium fed from the paper feed unit between each of the plate cylinders and the printing pressure applying member. In the stencil printing apparatus that sequentially conveys the ink image from the stencil sheet of each plate cylinder to the conveyed printing medium,
A printing position adjusting unit that varies the printing position of each plate cylinder with respect to the printing medium is provided, and when there is a print position adjustment command during the printing operation, printing of each plate cylinder by the printing position adjusting unit is performed. The position adjustment timing is changed according to the shift amount of the printing start timing of each of the plate cylinders.

In this stencil printing machine, the printing position adjustment timing of each plate cylinder is shifted by the printing position adjusting means in accordance with the shift difference in the printing start timing of each plate cylinder. The adjustment start positions for are the same.

According to a second aspect of the present invention, a plurality of rotatable plate cylinders on which the respective stencil sheets can be wound and mounted, a rotatable printing pressure applying member disposed in the vicinity of the respective plate cylinders, and the most upstream side are provided. A plate feeding unit for feeding a printing medium between the plate cylinder and the printing pressure applying member, and during the printing operation, the plurality of plate drums are rotated in synchronization with each other and are fed from the paper feeding unit. The printed printing medium is sequentially conveyed between each of the plate cylinders and the printing pressure applying member while applying a printing pressure, and an ink image is formed on the conveyed printing medium from the stencil sheet of each plate cylinder. In the stencil printing apparatus for transferring, each of the plate cylinders is provided with a print position adjusting means for changing the print position on the print medium, and when there is a print position adjusting command during a printing operation, the printing unit is operated by the paper feeding unit. Temporarily stop feeding the print medium, Performs the printing position adjustment of each plate cylinder by each printing position adjusting means and to resume the feeding of the print medium by the paper feed unit after the printing position adjustment completion.

In this stencil printing machine, the printing medium is not fed during the adjustment period of the printing position of each plate cylinder.

The invention of claim 3 is the invention of claim 1 or claim 2.
The stencil printing apparatus described above is characterized in that each of the printing position adjusting means is a left and right printing position adjusting means for adjusting a printing position of the printing medium in a direction orthogonal to a sheet conveying direction.

In this stencil printing machine, the same operation as the invention of claim 1 or 2 can be obtained with respect to the left and right printing position adjusting means.

A fourth aspect of the present invention is the stencil printing apparatus according to the third aspect, characterized in that the left and right printing position adjusting means have the same speed at which the plate cylinders are moved left and right.

In this stencil printing machine, in addition to the operation of the invention of claim 3, the adjustment ends in the left-right direction of each plate cylinder are aligned.

A fifth aspect of the present invention is the stencil printing apparatus according to any one of the first to fourth aspects, wherein each of the print position adjusting means adjusts the print position in the paper transport direction with respect to the print medium. It is a printing position adjusting means.

In this stencil printing machine, the same effects as the inventions of claims 1 to 4 can be obtained with respect to the upside-down printing position adjusting means.

According to a sixth aspect of the invention, there is provided the stencil printing apparatus according to the fifth aspect, wherein the top-bottom printing position adjusting means has the same speed for rotationally moving the plate cylinder.

In this stencil printing machine, in addition to the operation of the invention of claim 5, the adjustment is completed up to the top-bottom adjustment position of each plate cylinder.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a stencil printing apparatus 1, FIG. 2 is a schematic configuration diagram of a main portion of the stencil printing apparatus 1, and FIG. FIG. 4 is a schematic plan view for explaining the adjustment by the position adjusting means 60a, 61a, FIG. 4 is a schematic side view for explaining the adjustment by the top and bottom print position adjusting means 60b, 61b, FIG. 5 is a schematic circuit block diagram for the print position adjustment, and FIG. An operation flowchart when the print position adjustment mode is selected, and FIGS. 7A and 7B are timing charts when the print position adjustment mode is selected during the printing operation.

1 and 2, the stencil printing machine 1
Is mainly composed of a document reading unit 2, a plate making unit 3, a printing unit 4, a paper feeding unit 5, a paper discharging unit 6 and two plate discharging units 7.

The document reading section 2 is provided on the upper part of the apparatus main body 8 and reads a document used for printing as an electric signal.
The read information is generated as image data for the first plate cylinder color ink and the second plate cylinder color ink. Further, the image data can be processed based on a predetermined command (enlargement, reduction, etc.).

The plate-making unit 3 has a plate-making unit 9 provided on the apparatus main body 8 so as to be horizontally movable.
Is the first stencil sheet supply position for supplying the stencil sheet 11 to the first plate cylinder 25 by the plate making unit moving means 10 and the stencil sheet 11
Is moved to and from a second base paper supply position (position in FIG. 1) for supplying the second plate cylinder 26 with. Plate making unit moving means 10
Is a plate making unit moving motor 12 fixed to the plate making unit 9 side, a worm gear 13 fixed to the rotary shaft of the plate making unit moving motor 12, a worm wheel (not shown) meshing with the worm gear 13, It is composed of a pinion gear 14 fixed coaxially with a worm wheel (not shown), and a rack 15 fixed to the apparatus main body 8 side, which is engaged with the pinion gear 14.

The stencil making unit 9 conveys the stencil sheet containing portion 16 for containing the rolled long stencil sheet 11 and a plurality of transports for guiding the leading end side of the stencil sheet 11 stored in the stencil sheet housing 16 to the downstream side. Roll 17 and these transport rolls 1
7, a thermal head 18 disposed downstream of the thermal head 18, a platen roll 19 disposed at a position facing the thermal head 18 and rotated by a driving force of a write pulse motor (not shown), the platen roll 19 and the thermal head 18.
On the other hand, a base paper feed roll 20 arranged downstream of the stencil paper 11 in the transport direction and rotated by a driving force of a light pulse motor (not shown), a guide plate 21 against which the base paper feed roll 20 is pressed, and a base paper feed roll. 20 and guide plate 2
1 and a platen roll 19 and a base paper cutter 22 arranged between the thermal head 18.

The printing unit 4 includes a first plate cylinder 25 and a second plate cylinder 26.
And the paper cylinder 27 which is a printing pressure applying member, and the first plate cylinder 2
5 and the second plate cylinder 26 are arranged at diagonally upper left and right positions of the paper cylinder 27. Specifically, the first plate cylinder 25 and the second plate cylinder 26 are close to the outer peripheral surface of the paper cylinder 27, which are separated by about 90 degrees with respect to the center angle of the paper cylinder 27. First
The plate cylinder 25, the second plate cylinder 26, and the paper cylinder 27 are rotatably provided, respectively, and as shown by arrows in FIG. It is rotated by a drum rotation mechanism (not shown) to speed. The drum rotation mechanism (not shown) is driven by a main motor (not shown) as a drive source.

The first plate cylinder 25 and the second plate cylinder 26 are rotatably supported left and right annular frame members (in particular, no reference numeral is given).
The space between them is connected by a plate seat portion 28, and this plate seat portion 28 constitutes a part of the outer peripheral surfaces of the first plate cylinder 25 and the second plate cylinder 26. A stencil sheet clamp portion 29 is provided in the plate seat portion 28, and the leading end of the stencil sheet 11 is clamped by the stencil sheet clamp portion 29. Further, the front end side of the screen 30 is fixed to each plate seat portion 28, and the screen 30 is fixed to the first plate cylinder 25.
And is wound around each outer peripheral surface of the second plate cylinder 26. The rear end side of each screen 30 is provided with each plate seat 2 via a spring 31.
8, the screen 30 is provided so as to be able to bulge outward against the spring force of the spring 31. Each of the screens 30 is, for example, a mesh structure, and when pressed by an intermediate pressing roll 33 described below, the ink 38 passes from the inner surface side to the outer surface side. That is, each screen 30
Are configured as outer peripheral surface portions of the first plate cylinder 25 and the second plate cylinder 26 to which the ink 38 is supplied.

An inner press mechanism 32 is housed inside each screen 30 of the first plate cylinder 25 and the second plate cylinder 26. Each inner press mechanism 32 has an intermediate pressing roll 33 that has both a function of applying a printing pressure from the inner peripheral side of the screen 30 and a function of supplying the ink 38 to the screen 30. The intermediate pressing roll 33 is rotatably provided on the roll supporting members 34 on both sides, and is rotationally driven by a driving unit (not shown) in synchronization with the rotation of the first plate cylinder 25 and the second plate cylinder 26. This roll support member 3
4 is rotatably supported about a support shaft 35, and the roll support member 34 is rotationally moved in the direction of arrow a in FIG. 1 so that the intermediate press roll 33 presses the inner peripheral surface of the screen 30 and a roll support member. The intermediate push roll 33 is configured to be movable between the standby position and the standby position where the intermediate push roll 33 is separated from the inner peripheral surface of the screen 30 by rotating and moving in the direction of arrow b in FIG. The middle press roll 33 is set to a press position during printing,
The standby position is set except when printing.

A first doctor roll 36 and a second doctor roll 37 are fixed to the roll support member 34, respectively. The first doctor roll 36 and the second doctor roll 37 have a columnar shape, and both of them are the intermediate pressing roll 33.
Are located close to each other. Ink 38 is supplied from an ink supply unit (not shown) to an outer space of the middle press roll 33, which is an upper space surrounded by the first doctor roll 36 and the second doctor roll 37, and an ink reservoir 39 is formed at this position. Composed. The first color ink 38 is supplied to the first plate cylinder 25 side, and the second color ink 38 is supplied to the second plate cylinder 26 side. First doctor roll 3
The gap between 6 and the intermediate push roll 33 is equal to that of the intermediate push roll 3
The thickness of the ink that adheres to the nozzle 3 is set to a predetermined value, and the gap between the second doctor roll 37 and the middle press roll 33 is set so that ink leakage does not occur. That is, when the intermediate press roll 33 rotates, the intermediate press roll 33
Ink having a predetermined film thickness is continuously adhered to the outer peripheral surface of the first doctor roll 36 by a gap, and the ink is supplied to the screen 30 by the intermediate pressing roll 33.

Further, printing position adjusting means 60, 61 (shown in FIG. 5) for varying the printing positions of the first plate cylinder 25 and the second plate cylinder 26 on the printing paper 41 are provided respectively. The configuration of the print position adjusting means 60, 61 will be described below.

Further, a paper clamp portion 40 is provided at a predetermined position on the outer peripheral surface of the paper cylinder 27 which is a printing pressure applying member, and the front end of the print paper 41 which is a print medium can be clamped by the paper clamp portion 40.

The rotational positions of the first plate cylinder 25, the second plate cylinder 26, and the paper cylinder 27 can be detected by an encoder or a drum reference position detection sensor provided in a drum rotation mechanism (not shown). Is configured.

The paper feed section 5 is a printing paper 41 which is a printing medium.
Are stacked, a primary paper feed roll 43 that comes into pressure contact with the uppermost printing paper 41 from the paper feed tray 42, and a pair of two paper feed rolls arranged downstream of the primary paper feed roll 43.
Next paper feed roll 44, this secondary paper feed roll 44 and paper cylinder 2
Guide plate 4 for guiding the conveyance of the printing paper 41 between
5 and. By rotation of the primary paper feed roll 43, only the uppermost printing paper 41 is conveyed to the pair of secondary paper feed rolls 44, and the conveyed printing paper 41 is a pair of two.
It is supplied to the printing unit 4 in synchronization with the rotation of the paper cylinder 27 by the rotation of the next paper feed roll 44. Further, the primary paper feed roll 43 and the secondary paper feed roll 44 receive the driving force of the main motor (not shown) through the paper feed clutch (not shown) to obtain the paper feed operation. It is controlled by turning on and off a paper feed clutch (not shown).

The paper discharge section 6 is provided with the print paper 41 on which printing has been completed.
Upper guide portion 46 that guides the tip of the
A sheet stripping claw 47 for stripping the printing sheet 41 that has not been stripped from the sheet, and a pair of sheet ejection rolls 48 that convey the printing sheet 41 that is guided by the upper regulation guide portion 46 or stripped by the sheet stripping claw 47. And a paper discharge table 49 on which the print papers 41 discharged by the pair of paper discharge rolls 48 are placed in a stacked state.

The plate discharge section 7 includes a first plate cylinder 25 and a second plate cylinder 2.
Corresponding to No. 6, those having the same structure are provided at two places. Each plate discharge unit 7 includes a first plate cylinder 25 and a second plate cylinder 26.
A pair of stencil discharge rolls 5 arranged on the outer peripheral surface of the stencil with a slight distance
0, 51 and the stencil sheet 11 which is hung between the pair of plate discharge rolls 50, 51 and released by the sheet clamp portion 29.
Of the stencil sheet guiding belt 52 that guides the leading edge of the stencil sheet, and the stencil sheet 11 that is guided by the stencil sheet guiding belt 52 in cooperation with the stencil sheet discharging roll 51 while being peeled off from the first plate cylinder 25 and the second plate cylinder 26 and conveyed. 53 and these plate discharge rolls 51, 5
3 to the stencil sheet 11, and the stencil sheet 1 on the back side of the stencil sheet 54.
And a compression plate 55 for pressing 1.

Next, the printing position adjusting means 60, 61 (shown in FIG. 5) on the first plate cylinder 25 side and the second plate cylinder 26 side will be described. 3 and 4, the first plate cylinder 25 side and the second plate
The printing position adjusting means 60, 61 on the plate cylinder 26 side adjusts the printing position of the printing paper 41 in the direction S orthogonal to the paper transport direction T, and the left and right printing position adjusting means 60a, 61a, and the printing paper 41. And top and bottom print position adjusting means 60b and 61b for adjusting the print position in the paper transport direction T.

The left and right print position adjusting means 60a and 61a are
A nut portion 70 rotatably supported by the fixed portions of the first plate cylinder 25 and the second plate cylinder 26, a drive portion 71 that rotationally drives the nut portion 70, and a nut portion 7 that is screwed into the nut portion 70.
It is composed of a ball screw 72 which is sent in a direction orthogonal to the sheet conveyance direction by rotation of 0 and is supported on the apparatus main body 8 side. The left and right positions of the first plate cylinder 25 and the second plate cylinder 26 with respect to 8 are variable. The left and right print position adjusting means 60a on the first plate cylinder 25 side and the left and right print position adjusting means 61a on the second plate cylinder 26 side are configured to have the same speed for moving the plate cylinders 25 and 26 left and right.

Further, each top-and-bottom printing position adjusting means 60b, 61
Reference numeral b is a rotary phase shift mechanism including a sun gear (not shown) and a planetary gear (not shown) interposed in a drum rotating mechanism (not shown) of the first plate cylinder 25 and the second plate cylinder 26. (Not shown), the relative rotational position of the first plate cylinder 25 and the second plate cylinder 26 with respect to the paper cylinder 27 can be changed by changing the rotational position of the planetary gear with respect to the sun gear. The top-and-bottom printing position adjusting means 60b on the side of the first plate cylinder 25 and the top-and-bottom printing position adjusting means 61b on the side of the second plate cylinder 26 are configured to have the same speed for rotating and moving the respective plate cylinders 25 and 26.

Next, the control system for adjusting the printing position of the stencil printing machine 1 will be described. As shown in FIG. 5, left and right print position adjustment switches 62 and top and bottom print position adjustment switches 63 are provided in the operation panel of the apparatus body 8. These print position adjustment switches 62, 63
Is configured such that one of the printing position on the first plate cylinder 25 side and the printing position on the second plate cylinder 26 side can be specified and operated, and both can be operated simultaneously. The input data of the print position adjusting switches 62 and 63 are output to the control unit 64, and the control unit 64 outputs the original reading unit 2 based on the input data.
The plate making unit 3, the printing unit 4, the paper feeding unit 5, the paper discharging unit 6, and the plate discharging unit 7 at two locations are collectively controlled. Further, the control unit 64 controls writing and reading of the ROM 65 and the RAM 66 in which various programs are stored, and the printing position adjusting switches 62,
When 63 is operated, for example, the flow shown in FIG. 6 is executed. The details of this control will be described in detail in the section of the operation described below.

Next, the two-color printing operation of the stencil printing machine 1 will be briefly described. The document reading unit 2 reads a printed document and generates image data for the first plate cylinder color ink and the second plate cylinder color ink.

In the plate making section 3, the long stencil sheet 11 is conveyed by the rotation of the platen roll 19 and the stencil sheet feeding roller 20, and the thermal head 18 heats the stencil sheet 11 based on the image information read by the document reading section 2. A stencil is formed for each of the first plate cylinder color ink and the second plate cylinder color ink by punching, and the rear part of the punched stencil sheet 11 is cut by a stencil cutter 22 to form a first plate having a predetermined length. The stencil sheets 11 for the body color ink and the second edition body color ink are prepared. Then, the stencil sheet 9 for the first plate cylinder color ink is supplied to the first plate cylinder 25 side with the plate making unit 9 as the first base paper supply position, and the plate making unit 9 is set as the second base paper supply position. The stencil sheet 11 for color ink is supplied to the second plate cylinder 26 side.

In the printing unit 4, the first plate made by the plate making unit 3
The front end of the stencil sheet 11 for the plate cylinder color ink is clamped by the stencil sheet clamp portion 29 of the first plate cylinder 25, and in this clamped state, the first stencil plate 25 is rotated to move the stencil sheet 11 to the first plate cylinder 25. The screen 30 is wound around and mounted on the outer peripheral surface thereof.
Further, the front end of the stencil sheet 11 for the second plate cylinder color ink made by the plate making section 3 is clamped by the base paper clamp section 29 of the second plate cylinder 26, and the second plate cylinder 26 is rotated in this clamped state. The stencil sheet 11 is wound around and mounted on the outer peripheral surface of the screen 30 of the second plate cylinder 26.

In the paper feeding section 5, the printing paper 41 is synchronized with the rotation of the first plate cylinder 25, the second plate cylinder 26 and the paper cylinder 27 which will be described below.
Of the printing paper 4 by the paper clamp portion 40 of the paper cylinder 27.
The first plate cylinder 25 and the paper cylinder 2 with the front end of 1 clamped.
Transport between 7.

On the other hand, in the printing unit 4, each of the intermediate pressing rolls 33 is set to the standby position and the intermediate pressing rolls 33 are positioned away from the screen 30 except during printing. At the time of printing, the middle press rolls 33 are set to the pressing position, and the first plate cylinder 25 and the second plate cylinder 26 are rotated together with the paper cylinder 27. Then, each intermediate pressing roll 33 rotates on the inner peripheral surface of the screen 30 while pressing the inner peripheral side of the screen 30. Since the ink 38 is continuously supplied to the outer peripheral surface of the intermediate pressing roll 33, the ink 38 is transferred to the screen 30 by this rotation. Further, the screen 30 bulges to the outer peripheral side and is brought into pressure contact with the paper cylinder 27 by the pressing of the intermediate pressing roll 33. Then, as described above, the printing paper 41 is conveyed from the paper feed unit 5 between the first plate cylinder 25 and the paper cylinder 27, and the conveyed printing paper 41 is transferred to the middle press roll 33 of the first plate cylinder 25. The screen 30 and the stencil sheet 1 with the paper cylinder 27
It is conveyed while being pressed together with 1.

Next, the printing paper 41 is the second plate cylinder 26 and the paper cylinder 2.
7 and the printing paper 41 that has been conveyed.
Is conveyed while being pressed together with the screen 30 and the stencil sheet 11 between the medium press roll 33 of the second plate cylinder 26 and the paper cylinder 27. The ink 38 is transferred from the holes of the stencil sheet 11 to the printing paper 41 in each pressing and conveying process, and the two-color image is printed as described above. When the leading edge of the printing paper 41 passes the position of the intermediate press roll 33 on the second plate cylinder 26 side and reaches the downstream thereof, the paper clamp portion 40 is released.

In the paper discharge unit 6, the leading end side of the printing paper 41 is guided by the upper regulation guide portion 46, or the leading end side of the printing paper 41 is peeled off from the paper cylinder 27 by the paper peeling claw 47, and then a pair is formed. The sheet is conveyed to the sheet discharge table 49 via the sheet discharge roll 48.

In the plate discharge section 7, the stencil sheet 11 for printing is wound around and mounted on the outer peripheral surfaces of the screens 30 of the first plate cylinder 25 and the second plate cylinder 26 when a new plate making process is started. If there is, the first plate cylinder 2 before the plate making
5 and the base paper clamp portion 29 of the second plate cylinder 26 are released, the leading end side of the released stencil paper 11 is guided by the plate discharge guide belt 52 while rotating the first plate cylinder 25 and the second plate cylinder 26, and It is conveyed by the plate discharge rolls 51 and 53 and stored in the plate discharge box 54.

Next, the print position adjusting operation will be described with reference to FIG. Left / right or top / bottom print position adjustment switch 6
When 2, 63 are operated, it is checked whether or not the printing operation is in progress (step S1). If the printing operation is not in progress, the normal operation, that is, as described in the conventional example, the left and right print position adjusting means 60a and 61a and the top and bottom print position adjusting means 60b and 61b are operated according to the operation timing of the print position adjusting switches 62 and 63. It is driven for the adjustment command time. or,
If the printing operation is in progress, it is checked whether the adjustment is performed on only one of the first plate cylinder 25 and the second plate cylinder 26 or both adjustments are performed simultaneously (step S2). If only one of them is adjusted, the normal operation, that is, one of the left and right printing position adjusting means 60a, 61a or the one of the top-bottom printing position adjusting means 60b, 61b is operated according to the operation timing of the printing position adjusting switches 62, 63. It is driven for the adjustment command time.

When adjusting the printing positions of both the first plate cylinder 25 and the second plate cylinder 26, the rotation angle of the paper cylinder 27 (α degrees from the reference position) is checked (step S3), and the first
The left and right printing position adjusting means 60a and the upside-down printing position adjusting means 60b on the plate cylinder 25 side are driven to start the position adjustment, and the position adjustment is finished by driving for the adjustment command time (step S).
4). When the rotation position of the paper cylinder 27 is rotated to the rotation position of α + 90 degrees (step S5), the left and right printing position adjusting means 61a and the top-bottom printing position adjusting means 61b on the second plate cylinder 26 side are driven to start the position adjustment, The position adjustment is completed by driving for the adjustment command time (step S6). That is, FIG.
As shown in (A) and (B), the start timing of the print position adjustment on the second plate cylinder 26 side is set to the start timing of the print position adjustment on the second plate cylinder 26 side with respect to the start timing of the print position adjustment on the first plate cylinder 25 side. Plate cylinder 2
6 is delayed by the amount of rotation shift, that is, the time difference between the printing start timings of the first plate cylinder 25 and the second plate cylinder 26, so that the adjustment start positions of the plate cylinders 25 and 26 with respect to the printing paper 41 coincide. . As described above, the range of the print misalignment does not occur even when the two print position adjusting means 60 and 61 are caused to simultaneously adjust the print positions during the printing operation.

Further, in the first embodiment, the first plate cylinder 25
And left and right print position adjusting means 60a, 61 for the second plate cylinder 26
Since the adjustment speed of a is the same, each plate cylinder 25, 26
Since the adjustment end positions in the left-right direction are the same, no print misalignment range occurs.

Further, in the first embodiment, the first plate cylinder 25
And top-and-bottom printing position adjusting means 60b and 61 for the second plate cylinder 26
Since the adjustment speed of b is the same, each plate cylinder 25, 26
Since the adjustment end position in the up and down direction coincides, no print misalignment range occurs.

FIG. 8 shows the second embodiment of the present invention and is an operation flowchart when the print position adjustment mode is selected. When comparing the second embodiment with the first embodiment, only the operation processing at the time of adjusting the print position is different, and the other configurations are the same including the configuration of the print position adjusting means, and therefore the description thereof will be given. Omit it. For convenience of explanation, the same reference numerals as those in the first embodiment will be used in the following description.

The print position adjusting operation will be described below with reference to FIG. Left / right or top / bottom print position adjustment switch 6
When 2, 63 are operated, it is checked whether or not the printing operation is in progress (step S10). If the printing operation is not in progress, the normal operation, that is, as described in the conventional example, the left and right printing position adjusting means 60a and 61a and the top and bottom printing position adjusting means 60b and 61b are operated according to the operation timing of the printing position adjusting switches 62 and 63. To drive. If the printing operation is in progress, it is checked whether only one of the first plate cylinder 25 and the second plate cylinder 26 is adjusted or both of them are adjusted simultaneously (step S11). If only one of them is adjusted, the normal operation, that is, the print position adjustment switch 6
One of the left and right print position adjusting means 60a, 61a and the one of the top and bottom print position adjusting means 60b, 61b are driven for the adjustment command time in accordance with the operation timings of 2, 63.

When adjusting the printing positions of both the first plate cylinder 25 and the second plate cylinder 26, the paper feed clutch (not shown) is turned off regardless of the paper feed timing. The paper supply to the printing unit 4 by the paper unit 5 is temporarily stopped (step S12), and the left and right print position adjusting means 60a and 61a and the top and bottom print position adjustment are performed according to the operation timings of the left and right or top and bottom print position adjustment switches 62 and 63. Means 60
b and 61b are simultaneously driven for the adjustment command time (step 13). Then, when the adjustment of the printing position is completed, the paper feeding by the paper feeding unit 5 is restarted, and the printing operation is restarted (step S14). That is, since the printing paper 41 is not fed during the printing position adjustment period of each plate cylinder 25, 26, the printing position adjustment is performed simultaneously for the two printing position adjusting means 60, 61 during the printing operation. The range of print misalignment does not occur even when the printing is performed.

In the first and second embodiments, the plate cylinder 2
Although the case where there are two plates 5 and 26 is shown, the present invention can be applied to a device having three or more plate cylinders in a similar manner. In other words, if there is a print position adjustment command during printing,
The printing position may be adjusted by delaying the print adjustment time by the difference in the print start time of each plate cylinder on the downstream side with respect to the plate cylinder on the most upstream side.

In the first and second embodiments described above, the stencil printing machine has a plurality of plate cylinders 25 and 26 and one paper cylinder 27, but an apparatus having as many paper cylinders 27 as plate cylinders. The present invention can be applied to the same. Further, the present invention is applicable not only to the inner press system in which the printing pressure applying member is the paper cylinder 27, but also to the second embodiment.
As in the conventional example, the printing pressure applying member is the outer roll 12
The present invention can be similarly applied to the case of the outer press system of 0 and 121. In other words, regardless of the printing press system, it has a plurality of plate cylinders and sequentially conveys the print medium fed from the paper feed section between each plate cylinder and the printing pressure applying member while applying the printing pressure. The present invention can be applied to all stencil printing apparatuses that transfer an ink image from the stencil sheet of each plate cylinder to the conveyed printing medium.

In the first and second embodiments, the print position adjusting means 60, 61 are the left and right print position adjusting means 60.
a and 61a and both top and bottom print position adjusting means 60b and 61b, the print position can be adjusted two-dimensionally with respect to the printing paper 41, but the left and right print position adjusting means 60a and 6a.
It is also possible to have only one of 1a and the top-bottom print position adjusting means 60b and 61b, and to adjust the print position on the print paper 41 one-dimensionally (paper transport direction T or its left-right direction S).

[0067]

As described above, according to the first aspect of the invention, the plurality of plate cylinders, the printing pressure applying member arranged in the vicinity of each plate cylinder, and the plate cylinder on the most upstream side. The printing medium is provided between the printing pressure applying member and the printing medium feeding member, and during printing operation, the plurality of plate cylinders are rotated in synchronization with each other so that the printing medium fed from the paper feeding unit is printed. In a stencil printing apparatus that sequentially conveys between the cylinder and the printing pressure applying member while applying a printing pressure, and transfers the ink image from the stencil sheet of each plate cylinder to the conveyed printing medium, printing of each plate cylinder A print position adjusting unit for changing the print position on the medium is provided, and when a print position adjusting command is issued during the printing operation, the print position adjusting timing of each plate cylinder by each print position adjusting unit is set to the print position of each plate cylinder. Since it is changed according to the shift amount of the start timing, each version Since the print position adjustment timing of each plate cylinder by each print position adjusting unit is shifted according to the shift difference of the print start timing of, Even when the plurality of print position adjusting means are simultaneously adjusted in print position, the range of print misalignment does not occur.

According to the invention of claim 2, a plurality of plate cylinders,
A printing pressure applying member arranged at a close position of each plate cylinder,
The printing cylinder is provided between the most upstream plate cylinder and the printing pressure applying member, and during printing operation, the plurality of plate cylinders are rotated in synchronization with each other and fed from the paper feeding unit. A stencil printing device that sequentially conveys the formed printing medium between each plate cylinder and the printing pressure applying member while applying a printing pressure, and transfers an ink image from the stencil sheet of each plate cylinder to the conveyed printing medium. In the above, each plate cylinder is provided with a print position adjusting means for changing the print position with respect to the print medium, and when a print position adjustment command is issued during the printing operation, the print medium is temporarily fed by the paper feeding unit. Then, the printing position of each plate cylinder is adjusted by each printing position adjusting unit, and the printing medium is restarted to be fed by the paper feeding unit after the printing position adjustment is completed. Does not feed the print media,
The range of print misalignment does not occur even when a plurality of print position adjusting means are made to adjust the print positions at the same time during the printing operation.

According to a third aspect of the invention, there is provided the stencil printing apparatus according to the first or second aspect, wherein each of the print position adjusting means prints in a direction orthogonal to a sheet conveying direction with respect to the print medium. Since it is the left and right print position adjusting means for adjusting the position, the same effect as the invention of claim 1 or 2 can be obtained with respect to the left and right print position adjusting means.

According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, the left and right printing position adjusting means have the same speed for moving the respective plate cylinders to the left and right. In addition to the effect of the invention of 3, the printing misalignment range does not occur at all because the adjustment end positions in the left-right direction of the respective plate cylinders match.

According to a fifth aspect of the invention, there is provided the stencil printing apparatus according to the first to fourth aspects, wherein each of the print position adjusting means adjusts a print position in a sheet conveying direction with respect to the print medium. Since it is the upside-down printing position adjusting means, the upside-down printing position adjusting means can obtain the same effects as those of the inventions of claims 1 to 4.

According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fifth aspect, since the respective top-bottom printing position adjusting means have the same speed for rotating and moving the respective plate cylinders, In addition to the effect of the fifth aspect of the invention, the printing misalignment range does not occur at all because the adjustment end positions of the plate cylinders in the vertical direction coincide with each other.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a stencil printing apparatus showing a first embodiment of the present invention.

FIG. 2 shows the first embodiment of the present invention and is a schematic configuration diagram of a main part of a stencil printing apparatus.

FIG. 3 is a schematic plan view illustrating the first embodiment of the present invention and explaining the adjustment by the left and right print position adjusting means.

FIG. 4 is a schematic side view showing the first embodiment of the present invention and explaining the adjustment by the upside-down printing position adjusting means.

FIG. 5 is a schematic circuit block diagram relating to print position adjustment according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating an operation according to the first embodiment of the present invention when a print position adjustment mode is selected.

FIG. 7 shows the first embodiment of the present invention, (A), (B).
6A and 6B are timing charts when the print position adjustment mode is selected during the printing operation.

FIG. 8 is a flowchart illustrating an operation according to the second embodiment of the present invention when a print position adjustment mode is selected.

FIG. 9 is a partial schematic configuration diagram of a stencil printing apparatus of a first conventional example.

FIG. 10 is a partial schematic configuration diagram of a stencil printing apparatus of a second conventional example.

FIG. 11 is a diagram for explaining the difference in the print start timing on the printing paper between the first plate cylinder side and the second plate cylinder side when adjusting the left and right printing positions in the conventional example.

FIG. 12 is a diagram for explaining the difference in the print start timing on the printing paper between the first plate cylinder side and the second plate cylinder side when adjusting the left and right printing positions in the conventional example.

[Explanation of symbols]

1 Stencil printer 2 Document reading section 3 Plate making department 4 Printing department 5 paper feeder 6 Paper output section 7 Plate ejection section 11 Stencil paper 25 1st edition cylinder (plate cylinder) 26 2nd edition cylinder (plate cylinder) 27 Paper cylinder (printing pressure applying member) 30 screen 33 Middle-press roll 41 printing paper (printing medium) 60, 61 printing position adjusting means 60a, 61a left and right print position adjusting means 60b, 61b Top and bottom print position adjusting means T Paper transport direction S Paper transport direction orthogonal direction

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41L 13/04 B41F 33/14

Claims (5)

(57) [Claims] 1. A plurality of rotatable plate cylinders on which each stencil sheet can be wound and mounted, and arranged at a position close to each plate cylinder,
A rotatable printing pressure applying member, and a paper feeding unit for feeding a printing medium between the plate cylinder on the most upstream side and the printing pressure applying member are provided. The print medium that is rotated in synchronization and fed from the paper feed unit is sequentially conveyed between each of the plate cylinders and the printing pressure applying member while applying the printing pressure, and the conveyed printing medium In a stencil printing apparatus that transfers an ink image from the stencil sheet of each plate cylinder, a print position adjusting unit that changes a print position of each plate cylinder with respect to the print medium is provided, and a print position adjustment command is issued during a printing operation. If there is, the stencil printing apparatus is characterized in that the printing position adjustment timing of each of the plate cylinders by the printing position adjusting means is varied according to the shift amount of the printing start timing of each of the plate cylinders. 2. The stencil printing apparatus according to claim 1, wherein each of the printing position adjusting units is a left and right printing position adjusting unit that adjusts a printing position in a direction orthogonal to a sheet conveying direction with respect to the printing medium. A stencil printing machine characterized by. 3. The stencil printing apparatus according to claim 2, wherein the left and right printing position adjusting means have the same speed for laterally moving the respective plate cylinders. 4. The stencil printing apparatus according to claim 1, wherein each of the print position adjusting means adjusts a print position in a paper transport direction with respect to the print medium. A stencil printing machine characterized by: 5. The stencil printing apparatus according to claim 4, wherein the top-and-bottom printing position adjusting means has the same speed for rotationally moving the plate cylinder.