JP2002137517A - Stencil printing equipment and printing method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the staining with ink due to a so-called edge tear in a stencil paper from developing. SOLUTION: In a stencil printing equipment, in which a first plate cylinder 25 and a second plate cylinder 26, on the outer peripheral surface supplied with an ink of each of which a stencil base paper is windingly installed, and an impression cylinder 27 arranged near the respective plate cylinders 25 and 26 are equipped so as to carry a printing paper 41 under the application of printing pressure between the plate cylinder 25 and the impression cylinder 27 and between the plate cylinder 26 and the impression cylinder 27 in order to transfer the inks passed through the perforated holes of the stencil papers installed on the respective plate cylinders 25 and 26 to the carried printing paper 41 for executing printing. The outer peripheral surface part of each of the plate cylinders 25 and 26 is so constituted as to allow to overlappingly doubly install stencil base papers in such a manner that a solid image stencil paper 11a, which is produced by perforating within the region of a range slightly narrower than the paper size of the printing paper 41 on the basis of solid image data, is installed on each of the outer peripheral surface parts of the respective plate cylinders 25 and 26 and an image stencil paper 11b, which is produced by perforating on the basis of the desired image data, is installed over the solid image stencil paper 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention conveys a printing medium while applying a printing pressure between a printing drum and a rotating member around which a stencil sheet is wound and mounted. The present invention relates to a stencil printing apparatus that prints an image by transferring ink to a printing medium, and a printing method using the same.

[0002]

2. Description of the Related Art FIG. 9 shows a first conventional stencil printing apparatus of this type, and FIG. 9 is a schematic diagram showing a part of the stencil printing apparatus. In FIG. 9, the apparatus main body (not shown)
A first plate cylinder 101, a second plate cylinder 102, and an impression cylinder 103 are rotatably arranged therein, and the first plate cylinder 101 and the second plate cylinder 1
02 is the impression cylinder 1 which is about 90 degrees apart from the central angle of the impression cylinder 103.
03, respectively. A plate seat 10 is provided on each outer peripheral surface of the first plate cylinder 101 and the second plate cylinder 102.
1a and 102a are provided.
2a are provided with stencil clamps 101b and 102b for clamping a stencil sheet (not shown).

The outer peripheral surfaces of the first plate cylinder 101 and the second plate cylinder 102 have plate seats 101a and 102a and a spring 104, respectively.
Each of the screens 105 is stretched by using a mesh, and each of the screens 105 is formed of, for example, a mesh structure that allows the passage of ink. First plate cylinder 10
In the internal space of each screen 105 of the first and second plate cylinders 102, middle press rolls 106 and 107 are provided, respectively. Each of the middle press rolls 106 and 107 has a standby position where the screen 105 is not pressed and a press where the screen 105 is pressed. Moved to and from position. During the printing operation, each of the middle press rolls 106 and 107 is located at the press position,
At the pressed position, the screen 105 bulges outward.
The first color ink is applied to the screen 105 on the first plate cylinder 101 side through the middle press roll 106 via the second plate cylinder 102.
The second screen ink is supplied to the screen 105 on the side via the intermediate press roll 107, respectively. On the outer peripheral surface side of the impression cylinder 103, a paper clamp unit 109 capable of clamping the leading end of the printing paper 108 is provided, and the leading end of the printing paper 108 fed from the paper feeding unit 110 is clamped. Release the clamp near the entrance of.

Next, the general operation of printing will be described. The leading edge of a stencil sheet (not shown) produced based on the image data for the first color is attached to the stencil clamping section 101b of the first plate cylinder 101.
Then, the leading edge of a stencil sheet (not shown) produced based on the image data for the second color is clamped by the stencil clamping portion 102b of the second plate cylinder 102, and each screen 1
05 is attached to the outer peripheral surface. Next, the first plate cylinder 101, the second plate cylinder 102, and the impression cylinder 103 are synchronously rotated in the directions indicated by arrows in FIG. 9, and in this state, the first plate cylinder 101 and the impression cylinder 1 are rotated.
The printing paper 108 is conveyed from the paper feeding unit 110 between the printing paper 108 and the printing paper 108. The transported printing paper 108 is clamped by the paper clamping unit 109 of the impression cylinder 103, and passes between the first plate cylinder 101 and the impression cylinder 103 along the outer peripheral surface of the impression cylinder 103. During this passage, the middle press roll 106 is moved to the screen 1
05, the screen 105 bulges outward, and the first through the perforation of the stencil sheet (not shown) in the printing paper 108.
The color ink image is transferred. First plate cylinder 101 and impression cylinder 1
03 passes through the second printing drum 102
And the printing paper 108 is transported between the
It passes between the plate cylinder 102 and the impression cylinder 103. During this passage, the middle press roll 107 similarly presses the screen 105 to transfer the second color ink image. When the paper clamp unit 109 of the impression cylinder 103 rotates near the entrance of the paper discharge unit 111, the paper clamp unit 109 is released, and the unclamped printing paper 108 is discharged to the paper discharge unit 1.
11, the sheet is discharged to a predetermined position. As described above, two-color printing is performed.

FIG. 10 shows a second conventional example of a stencil printing apparatus. 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 provided rotatably in an apparatus main body (not shown), and the first plate cylinder 101 and the second plate cylinder 1 are provided.
Plates 101a and 102a are provided on the outer peripheral surface of the stencil 02, and stencil clamps 101b and 102b for clamping a stencil sheet (not shown) on the plate seats 101a and 102a.
Is provided. The outer peripheral surfaces of the first plate cylinder 101 and the second plate cylinder 102 other than the plate seats 101a and 102a are formed of a porous structure that allows the passage of ink, and the first plate cylinder 101 and the second plate cylinder 102 The inner space is provided with means for supplying the first color ink and the second color ink to each outer peripheral surface. Outer rolls 120 are provided below each of the first plate cylinder 101 and the second plate cylinder 102.
121 are provided rotatably. Each of the outer rolls 120 and 121 is located between a standby position (solid line position in FIG. 10) where the outer peripheral surfaces of the first plate cylinder 101 and the second plate cylinder 102 are not pressed, and a pressing position (virtual line position in FIG. 10) where the outer rolls are pressed. It is moved by. During the printing operation, each outer roll 12
0 and 121 are located at the pressing position. The paper feeding unit 122 feeds the printing paper 108 between the first plate cylinder 101 and the outer roll 120, and the paper discharging unit 123 outputs the printing paper 108 discharged from between the second plate cylinder 102 and the outer roll 121.
And discharge it to a predetermined position.

Next, the general operation of printing will be described. The leading edge of a stencil sheet (not shown) produced based on the image data for the first color is attached to the stencil clamping section 101b of the first plate cylinder 101.
Then, the leading edge of a stencil sheet (not shown) produced based on the image data for the second color is clamped by the stencil clamping portion 102b of the second plate cylinder 102, respectively, to thereby form the first plate cylinder 101.
And mounted on each outer peripheral surface of the second plate cylinder 102. Next, the outer roll 12 positioned at the pressing position together with the first plate cylinder 101 and the second plate cylinder 102 in the direction indicated by the arrow in FIG.
0 and 121 are synchronously rotated, and in this state, the first plate cylinder 1 is rotated.
The printing paper 108 is transported from the paper feeding unit 122 between the outer roll 120 and the outer roll 120. The transported printing paper 108 obtains a transport force by rotation of the first plate cylinder 101 and the outer roll 120 and passes between the first plate cylinder 101 and the outer roll 120.

During this passage, the first color ink image is transferred to the printing paper 108 through the perforations of the stencil sheet (not shown) by the pressing force of the outer roll 120. The printing paper 108 that has passed between the first plate cylinder 101 and the outer roll 120 is transported between the second plate cylinder 102 and the outer roll 121, and the printing paper 108 is transferred between the second plate cylinder 102 and the outer roll 121. The conveyance force is obtained 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 discharging unit 123. As described above, two-color printing is performed.

[0008]

By the way, in the stencil printing apparatuses of the first and second conventional examples, the printing paper 108 is formed between each of the plate cylinders 101 and 102 and the impression cylinder 103, and each of the plate cylinders 101 and 102. The printing paper 10 is transported between the outer rolls 102 and the outer rolls 120 and 121 while applying a printing pressure.
The portion of the stencil sheet (not shown) where the end face of the stencil 8 comes into contact is susceptible to damage such as shearing force. In particular, when the printing paper 108 is a thick paper or a hard paper, the damage is large, so that the stencil paper may have a so-called edge cut. Or
Even if the type of paper is not such a type, when the number of prints is large, the edge of the stencil sheet may be cut due to the accumulation of small damage. When the edge of the stencil sheet is cut, the ink on the outer peripheral surface of the plate cylinders 101 and 102 oozes out from the cut end face to the surface of the stencil sheet, and the ink is printed on the printing paper 1.
08 as well as the impression cylinder 103 and the outer roll 12
The problem of sticking to 0 and 121 occurs.

Since the end of the stencil sheet is cut off when the printing paper is pressed and conveyed between the plate cylinder and the impression cylinder or the outer roll as described above, the first conventional example and the second conventional example are used. This also occurs in a single-color printing apparatus other than the multi-color printing as in the example. However, in particular, when the printing paper 108 is conveyed over a long distance while being curved along the outer peripheral surface of the impression cylinder 103 as in the first conventional example. Since the printing paper is urged in the direction of contact with the stencil paper due to the reaction force of the waist, which tends to be on a straight line of the printing paper 108, the stencil paper is liable to be cut off at the end face, and ink stains due to the cut end face are easily generated. Countermeasures are important.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a stencil printing apparatus capable of preventing ink staining due to a so-called cut end of a stencil sheet and a printing method using the same. And

[0011]

According to a first aspect of the present invention, a stencil sheet is wrapped around an outer peripheral surface to which ink is supplied, and the stencil sheet is rotatable and rotatable. The printing medium is conveyed while applying a printing pressure between the plate cylinder and the rotating member during the printing operation, and the stencil sheet mounted on the plate cylinder is perforated in the conveyed printing medium. In a stencil printing apparatus that performs printing by transferring the passed ink, a stencil sheet is superimposed on the outer peripheral surface of the plate cylinder so that the stencil sheet can be double-mounted.
A solid image stencil sheet perforated based on solid image data in a region slightly smaller than the size of the print medium is mounted on the outer peripheral surface of the plate cylinder, and desired image data is placed on the solid image stencil sheet. Characterized in that a stencil sheet for images perforated on the basis of the above is mounted.

In this stencil printing apparatus, when the printing medium is conveyed between the plate cylinder and the rotating member while applying a printing pressure,
The ink on the outer peripheral surface of the plate cylinder passes through the perforation of the image data of the stencil sheet for image through the perforation of the solid image of the stencil sheet for solid image, whereby the ink is transferred, and the ink is transferred between the plate cylinder and the rotating member. In the press-contact conveyance process, even if the end face of the stencil sheet for image hitting the end face of the print medium is cut off, there is a non-stencil portion of the stencil sheet for solid image inside the cut end face, and the ink on the printing drum side is Does not flow to the surface from the cut end of the stencil sheet for image.

According to a second aspect of the present invention, a plurality of rotatable plate cylinders, each of which is rotatable and capable of being mounted around an outer peripheral surface to which a different ink is supplied, are disposed at positions close to the respective plate cylinders, and are rotatable. During the printing operation, a printing medium is conveyed while applying a printing pressure between each of the plate cylinders and the rotating member, and each of the stencils mounted on each of the plate cylinders on the conveyed printing medium. In a stencil printing apparatus that performs multicolor printing by transferring ink that has passed through the perforations of the stencil paper, the stencil paper is superimposed on the outer peripheral surface of each plate cylinder so that the stencil paper can be mounted in a double manner. A solid image stencil sheet perforated based on solid image data in a region slightly smaller than the size of the print medium is attached to the outer peripheral surface of the solid image stencil sheet based on desired image data. Perforated image Characterized in that fitted with a stencil sheet.

In this stencil printing apparatus, when the print medium is sequentially conveyed between each plate cylinder and the rotating member while applying a printing pressure, the ink on the outer peripheral surface of each plate cylinder is converted into a solid image stencil sheet. The ink is transferred by passing through the perforations of the image data of the stencil sheet for image through the perforations of the solid image, and the end faces of the printing medium come into contact with each other during the press-contact conveyance between each plate cylinder and the rotating member. Even if the edge of the stencil sheet for image is cut off, there is a non-stencil portion of the stencil sheet for solid image inside the cut edge, and the ink on the plate cylinder side is transferred from the cut end of the stencil sheet for image to the surface. Does not leak.

According to a third aspect of the present invention, a stencil sheet is wrapped around an outer peripheral surface to which ink is supplied, and is rotatable and rotatable, and a rotatable rotatable member disposed at a position close to the plate cylinder. During the printing operation, the printing medium is transported while applying a printing pressure between the plate cylinder and the rotating member, and the ink that has passed through the perforations of the stencil sheet mounted on the plate cylinder is transferred to the transported printing medium. In the stencil printing apparatus that performs printing, the stencil sheet is superimposed on the outer peripheral surface of the plate cylinder so that the stencil sheet can be double-mounted, and the outer peripheral surface of the plate cylinder has at least the area of the end face portion of the print medium. No plate making, a solid image stencil sheet perforated in other areas based on solid image data was mounted, and an image stencil sheet perforated based on desired image data was mounted from above the solid image stencil sheet. It is characterized by.

In this stencil printing apparatus, since a solid image can be formed even outside the end face of the size of the printing medium, the stencil sheet on which the image data of the printing medium is made by the adhesive force of the ink is held. Becomes possible.

According to a fourth aspect of the present invention, in the stencil printing machine according to the second aspect, the rotating member is a single impression cylinder having substantially the same diameter as the outer diameter of each plate cylinder. The print medium is transported along the outer peripheral surface of the print medium.

In this stencil printing apparatus, the printing medium is conveyed over a long distance while curving along the outer peripheral surface of the impression cylinder, and the conveyed printing medium tends to be aligned. Since the stencil sheet is urged in the direction of contact with the stencil sheet, an effect similar to that of the second aspect of the invention can be obtained for an apparatus in which the end face of the stencil sheet is easily cut.

According to a fifth aspect of the present invention, there is provided the stencil printing apparatus according to any one of the first to fourth aspects, wherein the stencil sheet for a solid image has a solid image size larger than a maximum printing area on the printing medium. It is characterized by.

In the stencil printing apparatus, in addition to the effects of the first to fourth aspects of the present invention, image data can be printed in the maximum printing area of the printing medium.

According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fourth aspects, the stencil sheet for a solid image has a solid image size larger than the area of the image data. And

In the stencil printing apparatus, the size of the solid image can be minimized in addition to the effects of the inventions of the first to fourth aspects.

According to a seventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, when the size of the print medium is the same as the size at the time of the previous printing, the stencil printing apparatus is mounted on the plate cylinder. A printing method of a stencil printing apparatus, wherein only the stencil sheet for image is replaced among the stencil sheets mounted.

According to the printing method of the stencil printing apparatus, in addition to the effects of the first to sixth aspects, if the size of the printing medium is the same as that at the time of the previous printing, the stencil sheet for the solid image is not replaced. May be.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a stencil printing device 1, FIG. 2 is a schematic configuration diagram of a main portion of the stencil printing device 1, and FIG. Is in the open position and the first is a state in which the stencil sheet is not mounted.
FIG. 4 is a side view of the plate cylinder 25 or the second plate cylinder 26, FIG. 4 is a side view of the first plate cylinder 25 or the second plate cylinder 26 showing a state where the solid image stencil sheet 11a is mounted, and FIG. Base paper 11b
FIG. 6 is a side view of the first plate cylinder 25 or the second plate cylinder 26 in a state where both the stencil sheet 11a and the solid image stencil sheet 11a are mounted.
6A is a plan view of the printing paper 41, FIG. 6B is a plan view of the stencil sheet 11a for solid image, FIG. 6C is a plan view of the stencil sheet 11b for image, and FIG. FIG. 8 is a schematic circuit block diagram, and FIG. 8 is an operation flowchart of the plate making / printing mode.

1 and 2, a stencil printing apparatus 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 at the upper part of the apparatus main body 8 and reads a document to be printed as an electric signal.
The read information is generated as image data for the first printing drum color ink and the second printing drum color ink. 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 in the apparatus main body 8 so as to be horizontally movable.
Is a first stencil sheet supply position where the stencil sheet 11 is supplied to the first plate cylinder 25 by the stencil unit moving means 10;
Is supplied to the second plate cylinder 26 (the position shown in FIG. 1). Plate making unit moving means 10
A plate making unit moving motor 12 fixed to the plate making unit 9 side, a worm gear 13 fixed to a rotating 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 engaged with the pinion gear 14 and fixed to the apparatus main body 8 side.

The stencil making unit 9 includes a stencil housing section 16 for accommodating a rolled stencil sheet 11 having a long shape, and a plurality of conveyance guides for guiding the leading end side of the stencil sheet 11 accommodated in the stencil housing section 16 to the conveyance downstream. 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), a platen roll 19 and the thermal head 18.
The stencil sheet 11 is disposed downstream of the stencil sheet 11 in the transport direction, and is rotated by a driving force of a light pulse motor (not shown); a guide plate 21 against which the stencil sheet feed roller 20 is pressed; 20 and guide plate 2
1 and a base paper cutter 22 disposed between the platen roll 19 and the thermal head 18.

The printing unit 4 includes a first plate cylinder 25 and a second plate cylinder 26.
A first plate cylinder 25 and a second plate cylinder 26 are disposed at diagonally upper left and right positions of the impression cylinder 27, respectively. More specifically, the first plate cylinder 25 and the second plate cylinder 26 are spaced apart from each other by about 90 degrees with respect to the central angle of the impression cylinder 27.
Are located close to the outer peripheral surface. First plate cylinder 2
5, the second plate cylinder 26 and the impression cylinder 27 are provided rotatably, and as shown by arrows in FIG. It is rotated by a drum rotation mechanism (not shown).
The drum rotation mechanism (not shown) is driven using 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 frames (particularly without reference numerals).
Are connected by a plate seat 28, which forms part of the outer peripheral surfaces of the first plate cylinder 25 and the second plate cylinder 26. A stencil clamp 29 is provided on the plate seat 28, and the leading end of the stencil 11 is clamped by the stencil clamp 29. The detailed configuration of the base paper clamp unit 29 will be described below.

A front end of a screen 30 is fixed to each plate seat 28, and the screen 30 is wound around each outer peripheral surface of the first plate cylinder 25 and the second plate cylinder 26. The rear end side of each screen 30 is connected to each plate seat 28 via a spring 31.
The screen 30 is provided so as to swell outwardly 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 press roll 33 described below, the ink 38 passes from the inner surface to the outer surface. That is, each screen 30
First plate cylinder 25 and second plate cylinder 26 to which ink 38 is supplied
Are formed as outer peripheral surface portions.

An inner press mechanism 32 is accommodated in each screen 30 of the first plate cylinder 25 and the second plate cylinder 26, respectively. Each of the inner press mechanisms 32 has an intermediate press 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 press roll 33 is rotatably provided on the roll support members 34 on both sides, and is rotationally driven in synchronization with the rotation of the first plate cylinder 25 and the second plate cylinder 26 by a driving unit (not shown). This roll support member 3
A roll support member 4 is rotatably supported about a support shaft 35, a roll support member 34 is rotated in a direction indicated by an arrow a in FIG. 1 and a middle press roll 33 presses the inner peripheral surface of the screen 30, and a roll support member. The roller 34 is configured to be rotatable in the direction of the arrow b in FIG. 1 so that the intermediate press roller 33 can be shifted to and from a standby position where the roller 33 is separated from the inner peripheral surface of the screen 30. The middle pressing roll 33 is set to a pressing position during printing,
It is a standby position 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 the
Are located in close proximity to each other. The ink 38 is supplied from an ink supply unit (not shown) to an outer space surrounded by the first doctor roll 36 and the second doctor roll 37, which is an outer peripheral space of the middle press roll 33, and an ink reservoir 39 is provided at this position. Be composed. A first color ink 38 is supplied to the first plate cylinder 25 side, and a second color ink 38 is supplied to the second plate cylinder 26 side. First doctor roll 3
The gap between 6 and the middle press roll 33 is
The film thickness of the ink adhering to 3 is set to a predetermined value, and the gap between the second doctor roll 37 and the middle press roll 33 is set to such a degree that no ink leakage occurs. That is, when the middle press roll 33 rotates, the middle press roll 33
The ink having a predetermined thickness is continuously adhered to the outer peripheral surface by a gap with the first doctor roll 36, and the ink is supplied to the screen 30 by the middle press roll 33.

The printing section 4 is provided with plate reference position sensors 60 and 61 for detecting plate reference positions of the first plate cylinder 25 and the second plate cylinder 26, respectively. An encoder (not shown) for detecting rotation of a main motor (not shown) of the drum rotating mechanism is provided.
The rotation positions of the cylinders 5 and 26 and the impression cylinder 27 can be checked.

The paper supply unit 5 includes a printing paper 41 as a printing medium.
, A primary paper feed roll 43 pressed from the paper supply table 42 to the uppermost printing paper 41, and a pair of 2
Next paper supply roll 44, this secondary paper supply roll 44 and impression cylinder 2
Guide plate 4 for guiding the conveyance of the printing paper 41 between itself and
And 5. Only the uppermost printing paper 41 is transported to the pair of secondary paper feeding rolls 44 by the rotation of the primary paper feeding roll 43, and the transported printing paper 41 becomes
By the rotation of the next paper feed roll 44, it is supplied to the printing unit 4 in synchronization with the rotation of the impression cylinder 27. Further, a paper size detecting means 59 (shown in FIG. 7) is provided on the paper feeding table 42, and the paper size of the printing paper 41 is detected by the paper size detecting means 59.

The paper discharge unit 6 is a printing paper 41 on which printing has been completed.
Upper regulating guide portion 46 for guiding the tip of
A paper stripping claw 47 for stripping the printing paper 41 which is not peeled from the paper sheet, and a pair of paper discharge rolls 48 for conveying the printing paper 41 guided by the upper regulation guide portion 46 or peeled off by the paper stripping claw 47; And a discharge table 49 on which the printing paper 41 discharged by the pair of discharge rollers 48 is placed in a stacked state.

The plate discharging section 7 includes a first plate cylinder 25 and a second plate cylinder 2.
6 are provided at two locations with the same configuration. Each plate discharging section 7 includes a first plate cylinder 25 and a second plate cylinder 26.
A pair of plate discharging rolls 5 which are arranged at a slight distance from the outer peripheral surface of
0, 51 and the stencil sheet 11 hung between the pair of stencil discharge rolls 50, 51 and released from the stencil clamping section 29.
And a stencil sheet 11 guided by the stencil guide belt 52 and a stencil sheet 11 conveyed while being peeled off from the first plate cylinder 25 and the second plate cylinder 26 in cooperation with the stencil roll 51. 53 and the plate discharging rolls 51, 5
A stencil box 54 for storing the stencil sheet 11 conveyed by the stencil 3, and a stencil sheet 1 at the back of the stencil box 54.
1 and a compression plate 55 for pressing the pressure plate 1.

Next, the detailed configuration of the base paper clamps 29 on the first plate cylinder 25 side and the second plate cylinder 26 side will be described. FIG.
As shown in detail in FIGS. 5 to 5, each base paper clamp unit 29 is composed of a lower clamp 29a and an upper clamp 29b. The lower clamp 29a and the upper clamp 29b are rotatably provided at a closed position for clamping the leading end of the stencil sheet 11 and an open position for releasing the clamping of the leading end of the stencil sheet 11, respectively. Then, the lower clamp 29 of the first plate cylinder 25
The opening and closing of the upper clamp 29a and the upper clamp 29b are performed by driving the lower clamp drive circuit 62 (shown in FIG. 7) and the upper clamp drive circuit 63 (shown in FIG. 7) of the first plate cylinder 25, respectively. The lower and upper clamps 29a and 29b of the second plate cylinder 26 are opened and closed by the lower clamp drive circuit 6 of the second plate cylinder 26.
4 (shown in FIG. 7) and the upper clamp drive circuit 65 (shown in FIG. 7). In the present embodiment, two clamps are provided to securely clamp the stencil sheet.
Alternatively, the configuration of the apparatus may be simplified and the cost of the apparatus may be reduced. Further, for example, as shown in FIG. 9, one clamp unit may be divided into two parts. According to the configuration shown in FIG. 9, the stencil paper can be reliably clamped, and the cost of the apparatus can be reduced.

Next, a schematic control system of the stencil printing machine 1 will be described. As shown in FIG. 7, an operation panel section 66 is provided in the apparatus main body 8. The operation panel section 66 is provided with a two-plate printing key (not shown) in addition to a plate making / printing start key (not shown), a numeric keypad (not shown) for inputting the number of prints, and the like. And a display panel unit (not shown) for displaying various data. Input data of the operation panel section 66, detection data of the sheet size detection means 59, detection data of the plate reference position sensor 60 of the first plate cylinder 25, and detection data of the plate reference position sensor 61 of the second plate cylinder 26. Are output to the control unit 67, and the control unit 67 outputs the original reading unit 2, the plate making unit 3, the printing unit 4, the paper feeding unit 5, and the paper discharging unit 6 based on each input data.
And the plate discharge section 7 at two locations. The control unit 67
Controls writing and reading of the ROM 68 and the RAM 69. The ROM 68 stores solid image data of each paper size and various program data. Then, when a two-plate printing key (not shown) is operated, the control section 67 executes, for example, a flow shown in FIG. The details of this control will be described in detail in the following operation.

Next, the size of a solid image of the stencil sheet 11a for a solid image created by the thermal head 18 will be described. In FIG. 6A, assuming that the paper size of the printing paper 41 is E0 and its maximum printing area is E1 (a range surrounded by a two-dot chain line), a range E2 of the solid image data of each paper size (in FIG. 6B, 6 (B), the size is slightly smaller than the paper size E0 (range enclosed by a broken line) and is set to a size (E0> E2 ≧ E1) equal to or larger than the maximum print area E1. , Is thermally perforated throughout this area. And stencil image 1
1b, as shown in FIG. 6C, the maximum print area E1
Thermal perforation is performed only in the following range. FIG. 6C shows a state in which the character "A" is perforated as image data, and is formed in the maximum print area E1.

Next, a description will be given of a two-color printing operation of the stencil printing apparatus 1 when the two-sheet printing mode is selected with reference to FIG. Now, the first plate cylinder 25 and the second plate cylinder 26 include:
It is assumed that the stencil sheet for solid image 11a and the stencil sheet for image 11b at the time of the previous printing are double-plated. The contents of the solid image stencil sheet 11a and the image stencil sheet 11b will be described later.

When the plate making start key is depressed (step S1), the plate making unit 9 is set to the first stencil supply position, the rotational position of the first plate cylinder 25 is confirmed and the plate discharging reference position is set (step S2). With the upper clamp 29b of the plate cylinder 25 in the open position, the image stencil sheet 11b is discharged (steps S3 and S4). Next, the paper size of the printing paper 41 of the paper supply unit 5 is checked based on the detection data of the paper size detection means 59, and if the paper size is different from the paper size at the time of the previous printing, it is determined that only the image data is not changed ( Step S
5). In this case, the lower clamp 29a of the first plate cylinder 25
Is set to the open position, and the stencil sheet 11a for solid image is discharged (steps S6 and S7). The stencil sheet 11 is transported by a fixed amount (step S8), and the leading end of the stencil sheet 11 sent out from the stencil making unit 9 is clamped by the lower clamp 11a (step S9). Then, the solid image data of the paper size of the printing paper 41 set in the paper feeding unit 5 is stored in the ROM 6.
8, a thermal perforation is performed on the thermal head 18 based on the solid image data to create a stencil sheet 11a for a solid image (step S10). Along with this plate making operation, the first plate cylinder 2
5 is rotated in synchronism with the first plate cylinder 25 to perform a plate-forming operation (step S11). The rear portion of the perforated stencil sheet 11a for solid image is cut by the stencil cutter 22 (step S12), and after this cutting, the first plate cylinder 25 is further rotated by a predetermined amount to set the stencil sheet 11a for solid image. Complete (see FIG. 4).

Also, the paper size of the printing paper 41 of the paper supply unit 5 is checked from the detection data of the paper size detecting means 59, and if the paper size is the same as that of the previous printing, it is determined that only the image data is changed. A decision is made (step S5). In this case, the process immediately proceeds to the next process without performing the plate discharging process and the plate receiving process on the stencil sheet 11a for the solid image.

Next, the stencil sheet 11 of the stencil making unit 9 is transported by a fixed amount (step S13), and the leading end of the stencil sheet 11 sent out from the stencil making unit 9 is clamped by the upper clamp 11b.
(Step S14). Then, thermal perforation is performed by the thermal head 18 based on the image data for the first printing drum color ink to create the stencil sheet 11b for image (step S15). Along with the plate making operation, the first plate cylinder 25 is rotated synchronously to perform a plate-forming operation on the first plate cylinder 25 (step S16). The rear part of the perforated stencil sheet 11b is cut by the stencil cutter 22 (step S17), and after this cutting, the first plate cylinder 25 is further rotated by a predetermined amount to complete the printing of the image stencil sheet 11b (FIG. 5).

Next, the plate making unit 9 is set at the second stencil sheet supply position, and the above-described plate discharging and plate making operations are performed in substantially the same manner on the second plate cylinder 26, and the heat is detected based on the image data for the second plate cylinder color ink. The perforated image stencil sheet 11b is transferred to the second plate cylinder 2
No. 6 (step S18).

Thereafter, a printing operation is performed after the first printing operation (steps 19 and S20).

Next, the first print operation and the print operation will be described. 1 and 2, the first plate cylinder 25, the second plate cylinder 26, and the impression cylinder 27 are synchronously rotated in the directions indicated by arrows, and in this state, between the first plate cylinder 25 and the impression cylinder 27. The printing paper 41 is transported from the paper feeding unit 5. The transported printing paper 41 is clamped by the paper clamping unit 40 of the impression cylinder 27, and the first plate cylinder 25 and the impression cylinder 27 are moved along the outer peripheral surface of the impression cylinder 27.
Pass between. In the process of passing the printing paper 41,
The intermediate press 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 rotation of the ink 38
Is transferred. In addition, the screen 30 swells to the outer peripheral side by the pressing of the intermediate pressing roll 33 and is brought into pressure contact with the impression cylinder 27. Then, the transported printing paper 41 is transferred to the first plate cylinder 2.
Screen 5 between the intermediate press roll 33 and the impression cylinder 27
The first color ink image is transferred to the printing paper 41 through the perforations of the image stencil sheet 11b while being pressed and conveyed along with the stencil sheets 11a and 11b. First plate cylinder 25
The printing paper 41 passing between the printing cylinder 41 and the impression cylinder 27
6 and the impression cylinder 27, and the printing paper 41 passes between the second plate cylinder 26 and the impression cylinder 27. During this passage, the intermediate pressing roll 33 similarly presses the screen 30 and
The color ink image is transferred. When the paper clamp unit 40 of the impression cylinder 27 rotates near the entrance of the paper discharge unit 6, the paper clamp unit 40 is released.

In the paper discharge section 6, the leading end side of the printing paper 41 is guided by the upper regulating guide section 46, and the leading end side of the printing paper 41 is peeled off from the impression cylinder 27 by the paper peeling claw 47. The sheet is conveyed to a sheet discharge table 49 via a sheet discharge roller 48. Thus, the two-color image is printed on the printing paper 41.

Next, the ink transfer operation in the printing operation process will be described in detail. When the printing paper 41 is sequentially conveyed between the plate cylinders 25 and 26 and the impression cylinder 27 while applying a printing pressure, the ink 3 on the outer peripheral surface of the plate cylinders 25 and 26 is removed.
Ink 8 is transferred by passing 8 through the perforation of the image data of the image stencil sheet 11b through the perforation of the solid image of the stencil sheet 11a. The stencil sheet 11b for the image to which the end face of the printing paper 41 abuts in the pressing and conveying process between the plate cylinders 25 and 26 and the impression cylinder 27, respectively.
Is cut off, there is a non-stencil portion of the stencil sheet 11a for solid image inside the cut of the end face, and the ink 38 on each of the cylinders 25 and 26 is cut off the end face of the stencil sheet 11b for image. Does not flow onto surfaces. Therefore, stencil paper 1
1b can be prevented from being stained by the so-called cut edge.

In the above embodiment, the rotating member is disposed in the vicinity of the first plate cylinder 25 and the second plate cylinder 26, and has a single diameter substantially the same as the outer diameter of each plate cylinder 25, 26. Since the printing paper 41 is conveyed along the outer peripheral surface of the impression cylinder 27, the printing paper 41 is transported along the outer peripheral surface of the impression cylinder 27.
Is conveyed over a long distance while curving, and the printing paper 41 being conveyed is urged in a direction in which it comes into contact with the image stencil sheet 11b by the reaction force of the waist, which tends to be aligned. Although the end face is easily cut, such a device is also used for the stencil sheet 1 for the above-described reason.
1b can be prevented from being stained by the so-called cut edge.

In the above embodiment, the stencil sheet 1 for solid image is used.
1a, the size of the solid image is set to be equal to or larger than the maximum print area E1 on the print paper 41, so that image data can be printed on the maximum print area E1 of the print paper 41.

In the above embodiment, when the paper size of the printing paper is the same as that of the previous printing, each plate cylinder 2
Since only the image stencil sheet 11a among the stencil sheets 11 mounted on the sheets 5 and 26 is exchanged, the solid image stencil sheet 11a is not exchanged if the printing paper 41 has the same size as that of the previous printing. Therefore, cost reduction of the stencil paper 11
It contributes to shortening the time of the plate making process.

According to the above-described embodiment, the present invention relates to a stencil printing apparatus having a plurality of plate cylinders 25 and 26 and a single impression cylinder 27 and performing two-color (multicolor) printing by an inner press method. Although the case where the present invention is applied is shown, the present invention is also applicable to a stencil printing machine having a single plate cylinder and a single impression cylinder and performing monochrome printing by an inner press method. Further, as in the second conventional example, a stencil printing apparatus having a plurality of plate cylinders and a plurality of outer rolls and performing two-color (multicolor) printing by an outer press method is also required. The present invention can be similarly applied to a stencil printing apparatus which has an outer roll and performs monochrome printing by an outer press method. That is, according to the present invention, printing is performed by transferring the printing medium between the plate cylinder on which the stencil sheet is mounted and the rotating member while pressing the printing medium, and transferring the ink from the perforations of the stencil sheet to the printing medium in the pressing and conveying process. Applicable to all stencil printing machines.

In the above-described embodiment, since one-sheet printing and two-sheet printing can be switched using the two-sheet printing key, the two-sheet printing is performed when printing thick paper, hard paper, or a large number of sheets. In other cases, it is possible to switch to single-plate printing, so double printing can be performed only when there is a risk of ink contamination due to cut edges.
This contributes to cost reduction of the stencil sheet 11 and shortening of the time of the stencil making process.

In this embodiment, even when the size of a printing medium such as a business card is small, a stencil sheet made of image data of a printing medium is wound on a stencil sheet made of a solid image. However, according to this method, there is a small amount of ink holding the stencil sheet of the image data of the print medium, so that the stencil sheet may be displaced or wrinkled at a portion where there is no ink. Therefore, when the size of the print medium is small, it is desirable to form a solid image even outside the end face of the size of the print medium. According to this configuration, it is possible to hold the stencil sheet on which the image data of the print medium has been made by the adhesive force of the ink, and it is possible to prevent the stencil sheet from shifting or wrinkling.

In the present embodiment, the standard of the size of the solid image is smaller than the size of the print medium or larger than the maximum print area. However, the standard is set to be larger than the area of the print image data. You may. According to this configuration, it is possible to minimize the size of the solid image.

In the above embodiment, only one stencil sheet 11a for solid image is formed, but two or more stencil sheets 11a may be formed.

In the above embodiment, the solid image data of each sheet size is stored in the ROM 68. However, the solid image data may be generated from the sheet size detecting means 59 of the sheet supply table 42. .

[0061]

As described above, according to the first aspect of the present invention, a printing medium is provided while applying a printing pressure between the plate cylinder and the rotating member during a printing operation. In a stencil printing apparatus that prints an image by transferring ink transferred from the perforations of the stencil sheet attached to the plate cylinder to the transferred printing medium, the stencil sheet is superimposed on the outer peripheral surface of the plate cylinder. A solid image stencil sheet having a whole area slightly smaller than the size of the print medium perforated based on solid image data is mounted on the outer peripheral surface of the plate cylinder. Since the image stencil sheet perforated based on the desired image data is mounted from above the stencil sheet, when the printing medium is conveyed between the plate cylinder and the rotating member while applying the printing pressure, the outer periphery of the plate cylinder is Surface ink is for solid images The ink is transferred by passing through the perforations of the image data of the stencil sheet for image through the perforations of the solid image of the stencil sheet, and the image is brought into contact with the end face of the printing medium during the press-contact conveyance process between the plate cylinder and the rotating member. Even if the edge of the stencil sheet is cut off, there is a non-stencil part of the stencil sheet for solid image inside the cut edge, and the ink on the plate cylinder side flows out from the cut end of the stencil sheet for image to the surface. Therefore, it is possible to prevent ink contamination due to the so-called cut edge of the stencil sheet.

According to the second aspect of the present invention, the printing medium is provided with a plurality of plate cylinders and a rotating member, and a printing medium is conveyed while applying a printing pressure between each plate cylinder and the rotating member during a printing operation. In a stencil printing apparatus that prints a multicolor image by transferring ink passing through the perforations of each stencil sheet mounted on each plate cylinder onto the conveyed printing medium, the stencil sheet is superimposed on the outer peripheral surface of each plate cylinder. A solid image stencil sheet is punched out on the outer peripheral surface of each plate cylinder on the outer peripheral surface of each plate cylinder based on solid image data. Since the stencil sheet for image perforated based on the desired image data is mounted on the stencil sheet for solid image, the printing medium is sequentially conveyed between each plate cylinder and the rotating member while applying the printing pressure. Then, outside each plate cylinder The ink on the surface portion passes through the perforations of the image data of the stencil sheet for image through the perforations of the solid image of the stencil sheet for solid images, whereby the ink is transferred, and is pressed and conveyed between each plate cylinder and the rotating member. In the process, even if the edge of the stencil sheet for image where the end face of the printing medium hits is cut, the non-stencil part of the stencil sheet for solid image is inside the cut edge, and the ink on the plate cylinder side is used for the image. Since the stencil sheet does not flow out from the cut end portion of the stencil sheet to the surface, it is possible to prevent ink contamination due to the so-called cut end of the stencil sheet.

According to the third aspect of the present invention, since the size of the print medium can form a solid image outside the end face,
It is possible to hold a stencil sheet on which image data of a printing medium is made by the adhesive force of the ink.

According to a fourth aspect of the present invention, in the stencil printing machine according to the second aspect, the rotating member is arranged close to the plurality of plate cylinders and has substantially the same outer diameter as each plate cylinder. It is a single impression cylinder having a diameter, and is configured to transport the print medium along the outer peripheral surface of the impression cylinder, so that the print medium is transported along the outer peripheral surface of the impression cylinder while being curved for a long distance, An apparatus in which the edge of the stencil sheet is liable to be generated because the conveyed printing medium is urged in a direction in which the stencil sheet comes into contact with the stencil sheet of the image data by the reaction force of the waist, which tends to be aligned. The same effect as that of the invention is obtained.

According to a fifth aspect of the present invention, there is provided the stencil printing apparatus according to any one of the first to fourth aspects, wherein the stencil sheet for a solid image has a size of the solid image that is equal to or larger than a maximum printing area on the printing medium. Therefore, in addition to the effects of the first to third aspects of the present invention, image data can be printed in the maximum print area of the print medium.

According to the sixth aspect of the present invention, in the stencil printing apparatus according to the first to fourth aspects, the size of the solid image can be minimized.

According to the seventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, when the size of the printing medium is the same as that at the time of the previous printing, the stencil printing apparatus is mounted on the plate cylinder. Since only the image stencil sheet of the stencil sheet attached is exchanged, in addition to the effects of the invention according to claims 1 to 4, if the size of the print medium is the same as that at the time of the previous printing, the solid image Since the stencil sheet is not replaced, it contributes to cost reduction of the stencil sheet and shortening of the time of the stencil making process.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a stencil printing apparatus according to an embodiment of the present invention.

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

FIG. 3 is a side view of a first plate cylinder or a second plate cylinder showing an embodiment of the present invention, in a state where both upper and lower clamps are in an open position and a stencil sheet is not mounted.

FIG. 4 shows an embodiment of the present invention, in which a first plate cylinder 25 or a second plate cylinder 2 is shown in a state where a stencil sheet for a solid image is mounted.
6 is a side view.

FIG. 5 shows an embodiment of the present invention, and shows a first state in which both the image stencil sheet and the solid image stencil sheet are mounted.
It is a side view of a plate cylinder or a second plate cylinder.

6A and 6B show an embodiment of the present invention, wherein FIG. 6A is a plan view of a printing sheet, FIG. 6B is a plan view of a stencil sheet for a solid image,
(C) is a plan view of the image stencil sheet.

FIG. 7 is a schematic circuit block diagram showing a stencil printing apparatus according to an embodiment of the present invention.

FIG. 8 shows an embodiment of the present invention and is an operation flowchart of a plate making / printing mode.

FIG. 9 is a schematic view showing another embodiment of the present invention and showing a configuration of a clamp unit.

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

FIG. 11 is a partial schematic configuration diagram of a stencil sheet of a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 11 Stencil sheet 11a Stencil sheet for solid image 11b Stencil sheet for image 25 First plate cylinder (plate cylinder) 26 Second plate cylinder (plate cylinder) 27 Impression cylinder (rotating member) 29 Base paper clamp part 29a Lower clamp 29b Upper clamp 38 Ink 41 Print paper (print medium) E0 Paper size of print paper E1 Maximum print area of print paper E2 Area of solid image

Claims (7)

[Claims] 1. A stencil sheet is wrapped around an outer peripheral surface to which ink is supplied. The stencil sheet is rotatable, and a rotatable plate cylinder is provided. By transferring a printing medium while applying a printing pressure between the plate cylinder and the rotating member, by transferring the ink that has passed through the perforations of the stencil sheet mounted on the plate cylinder to the transferred printing medium. In the stencil printing apparatus for performing printing, the stencil sheet is superimposed on the outer peripheral surface of the plate cylinder so that the stencil sheet can be double-mounted, and the outer peripheral surface of the stencil is slightly smaller than the size of the printing medium. It is characterized in that a solid image stencil sheet perforated based on solid image data is mounted in an area of only a narrow range, and an image stencil sheet perforated based on desired image data is mounted from above the solid image stencil sheet. Toss Stencil printing apparatus. 2. A printing apparatus comprising: a plurality of rotatable plate cylinders, each of which is rotatable and capable of being mounted around an outer peripheral surface to which a different ink is supplied, and a rotatable rotatable member disposed at a position close to each of the plate cylinders. In the printing operation, a printing medium is conveyed while applying a printing pressure between each of the plate cylinders and the rotating member, and the conveyed printing medium is provided with the stencil sheet mounted on each of the plate cylinders. In a stencil printing apparatus that performs multicolor printing by transferring ink that has passed through the perforations, the stencil sheet is superimposed on the outer peripheral surface portion of each of the plate cylinders so that the stencil paper can be mounted in a double manner, A solid image stencil sheet perforated based on solid image data in a region slightly smaller than the size of the printing medium is mounted on the outer peripheral surface of the cylinder, and desired image data is placed on the solid image stencil sheet. Based on Stencil printing machine, characterized in that the stencil holes image attached. 3. A printing operation, comprising: a rotatable plate cylinder, which is rotatable and rotatable around a stencil sheet around an outer peripheral surface portion to which ink is supplied; and a rotatable rotatable member disposed close to the plate cylinder. Sometimes transferring a printing medium while applying a printing pressure between the plate cylinder and the rotating member, and transferring the ink that has passed through the perforations of the stencil sheet mounted on the plate cylinder to the transferred printing medium. In the stencil printing apparatus, the stencil sheet is superimposed on the outer peripheral surface of the plate cylinder so that the stencil sheet can be double-mounted, and the outer peripheral surface of the plate cylinder has at least an end surface portion of the printing medium. Area is made no stencil, the other area is mounted with a solid image stencil sheet perforated based on the solid image data, and the image stencil sheet perforated based on the desired image data from above the solid image stencil sheet. I put it on Stencil printing apparatus according to claim. 4. The stencil printing machine according to claim 2, wherein the rotating member is a single impression cylinder having substantially the same diameter as the outer diameter of each plate cylinder, and extends along the outer peripheral surface of the impression cylinder. A stencil printing apparatus, wherein the printing medium is transported by a stencil printer. 5. The stencil printing apparatus according to claim 1, wherein the stencil sheet for a solid image has a size of a solid image larger than a maximum printing area on the printing medium. Stencil printing machine. 6. The stencil printing apparatus according to claim 1, wherein the solid image stencil sheet has a solid image size larger than an image data area. . 7. The stencil printing machine according to claim 1, wherein the size of the printing medium is the same as that used in the previous printing, and the stencil sheet mounted on the printing cylinder. A printing method for a stencil printing apparatus, wherein only the stencil sheet for image is replaced.