JP2002002080A - Stencil printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution in a plate cylinder, to improve rigidity of the supporting mechanism for an intermediate press roller and to improve serviceability during adjustment by improving an adjusting mechanism for adjusting balance of printing concentration. SOLUTION: To the apparatus main body of a stencil printing apparatus, in a plate cylinder unit 24A, the back side is supported by inserting the central cylinder 53 into a receiving hole 55 on the apparatus main body side and the front side is supported by inserting the shaft 56 of the apparatus main body side into a movable supporting member 57 on the plate cylinder unit 24A side. E.g. when a gap between the impression cylinder 25 and the intermediate press roller 30 is larger at the front side of the plate cylinder unit 24A, the supporting member 57 is moved upward and the front side of the plate cylinder unit 24A is lowered downward to unify the above described gap and to adjust the balance of the printing concentration. As relative position between the plate cylinder 24 and the impression cylinder 25 is changed and the intermediate press roller 30 is not directly moved like this, the constitution in the plate cylinder 24 is simplified and rigidity of the supporting mechanism of the intermediate press roller 30 is improved and serviceability during adjustment becomes good.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a cylindrical plate cylinder for stencil printing a stencil sheet, a middle roller arranged inside the plate cylinder, and an impression cylinder for locking printing paper. The present invention relates to a stencil printing apparatus that adjusts the printing density balance on printing paper when the stencil paper and the printing paper are pressed against the intermediate press roller and the impression cylinder.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 11, a stencil printing apparatus has a perforated peripheral wall 101 having a porous structure arranged in a cylindrical shape, and a rotatable plate cylinder 100 rotatable about its own axis. have. On the outer peripheral surface of the peripheral wall 101, a stencil sheet, which has been made, is wound and mounted. Inside the plate cylinder 100, an intermediate pressing roller 102 for bulging the peripheral wall 101 outward.
Are arranged with an axis parallel to the axis of the plate cylinder 100. On the outer side of the plate cylinder 100, an impression cylinder 10 for pressing a printing sheet against a stencil sheet formed on the outer peripheral surface of the peripheral wall 101 is provided.
There are three. Then, in synchronization with the rotation of the plate cylinder 100, the plate cylinder 1
00 and the impression cylinder 103, the peripheral wall 101 is swelled and deformed by the intermediate pressing roller 102, and the plate cylinder 10
By pressing the stencil sheet and the printing paper, which have been subjected to zero printing, between the impression cylinder 103 and pressing them, the ink that has passed through the perforated portion of the stencil sheet is transferred to the printing paper and printing is performed.

The impression cylinder 103 is formed of an inelastic material such as metal and has the same outer diameter as the plate cylinder 100. Plate cylinder 1
Reference numeral 03 denotes an axis parallel to the axis of the plate cylinder 100 at a predetermined distance from the peripheral wall 101 of the plate cylinder 100. The impression cylinder 103 locks the end of the printing paper at a part of the outer peripheral surface thereof, and rotates around its own axis in synchronization with the rotation of the plate cylinder.

In the plate cylinder 100, an inner frame 104 is fixedly arranged. A pair of roller support arms 105 are pivotally supported on the inner frame 104 so as to be swingable. The both ends of the intermediate pressing roller 102 have roller supporting arms 105.
It is rotatably supported on the side. Middle press roller 102
Can be moved up and down substantially in the vertical direction as the roller support arms 105 swing. A cam shaft 107 to which a plate cam 106 is fixed is rotatably supported by the inner frame 104. A linking yoke member 109 is connected to a swing end of the roller support arm 105 by a pivot 108.
A cam follower 110 that is in contact with the plate cam 106 is attached to the link yoke member 109. Camshaft 107
Is selectively connected to an internal main gear 111 in the plate cylinder 100 via an electromagnetic clutch (not shown), and is driven to rotate as the plate cylinder 100 rotates. The rotation of the cam shaft 107 rotates the plate cam 106 to move the cam follower 110 up and down, whereby the swinging end of the roller support arm 105 moves up and down via the linking yoke member 109, and the intermediate pushing roller 102
Up and down. When the middle press roller 102 descends,
The outer peripheral surface contacts the inner peripheral surface of the peripheral wall 101 and
Bulge and deform.

The intermediate pressing roller 102 also functions as a squeegee roller for supplying ink to the inner peripheral surface of the plate cylinder 100. The roller support arm 105 includes a middle pressing roller 102.
A doctor rod 113 extending parallel to the outer peripheral surface at a small interval is fixedly supported. Middle press roller 1
The ink metered and supplied from an ink supply unit (not shown) forms a wedge-shaped ink reservoir 114 between the 02 and the doctor rod 113. Then, the ink in the ink reservoir 114 is supplied to the inner peripheral surface of the peripheral wall 101 while being measured while passing through a minute interval with the doctor rod 113 by the rotation of the intermediate pressing roller 102 in the counterclockwise direction in FIG.

[0006] The plate cylinder 100 is provided inside the plate cylinder 100.
There is provided a roller drive arm 116 which is rotatably supported at an intermediate portion with respect to a center cylinder shaft 115 which is a center of rotation of the roller. One end of the roller drive arm 116 has an intermediate gear 1
17 is rotatably supported. Roller drive arm 1
The other end of the body 16 is connected to the inner frame 104 via a tension spring 118.
It is connected to the. Thereby, the roller drive arm 11
6 is urged in the counterclockwise direction in FIG. 11 by the spring force of the tension spring 118, and the intermediate gear 117 is
1 always meshes with a gear 119 provided concentrically at the end of the intermediate pressing roller 102. That is, the intermediate pressing roller 10
2 always meshes with the intermediate gear 117 while ascending and descending, and rotates counterclockwise in FIG. 11 as the plate cylinder 100 rotates as described above.

The intermediate pressing roller 102 is arranged in such a manner that the axes thereof are parallel to the impression cylinder 103, that is, the intermediate pressing roller 1
It is preferable that the interval between the outer peripheral surface of the impression cylinder 103 and the outer peripheral surface of the impression cylinder 103 be equal in the left and right widths in the transport direction of the printing paper. However, the intermediate pressing roller 102 and the impression cylinder 10
The above-mentioned arrangement relationship of the intermediate press roller 10 due to the intersection of each part and the assembly intersection constituting the inside of the plate cylinder 100 described above.
2 or the intersection of the fixed portion between the plate cylinder 100 and the impression cylinder 103 may cause a displacement. As a result, the pressing force in the width direction of the printing paper is different, and the printing density balance is lost.

Conventionally, a stencil printing apparatus has been provided with an adjusting mechanism for adjusting the print density balance. In this adjustment mechanism, as shown in FIG. 11, an adjustment plate 121 is swingably attached to each roller support arm 105, and the end portions of the intermediate pressing roller 102 and the doctor rod 113 are supported by each adjustment plate 121. I have. Also,
The swing of each adjustment plate 121 is controlled by the roller support arm 1.
05 is regulated via an adjustment collar 122 having a cam structure. Then, both or one of the adjustment collars 1
By rotating the roller support arm 105,
In response to this, the adjustment plate 121 swings, and accordingly, the end portion of the intermediate pressing roller 102 slightly moves in the vertical direction. This allows
The distance between the intermediate pressing roller 102 and the outer peripheral surface of the impression cylinder 103 is
It can be adjusted to be equal in the left and right widths in the transport direction of the printing paper.

[0009]

However, in the above-mentioned conventional stencil printing apparatus, since the adjusting mechanism for adjusting the printing density balance is provided inside the plate cylinder 100, the intermediate pressing roller 102 is raised and lowered and the intermediate pressing roller is moved. Depending on the relationship with other mechanisms for rotating 102, plate cylinder 100
There is a problem that the entire internal mechanism becomes complicated, and the factors that cause the above-described intersections of parts and assembly intersections cannot be substantially eliminated.

Further, since the adjusting mechanism is provided in the plate cylinder 100 and ink is supplied to the inside of the plate cylinder 100, the ink is applied to the adjustment collar 122 as ink stain when adjusting the print density balance. Because it is attached
There is a problem that serviceability deteriorates during maintenance or the like.

The adjusting mechanism includes an intermediate pressing roller 10.
2 is provided on the roller support arm 105 for raising and lowering the roller support arm 105.
There is also a problem that the rigidity of the wire is reduced.

In order to solve the above problems, the present invention provides an adjusting mechanism for adjusting the print density balance outside the plate cylinder, simplifies the structure inside the plate cylinder, improves rigidity, and improves the rigidity. It is an object of the present invention to provide a stencil printing apparatus capable of improving serviceability.

[0013]

According to the present invention, there is provided a stencil printing apparatus according to the present invention, wherein the stencil printing apparatus is formed in a cylindrical shape so as to rotate around its own axis, and has a plate formed on its outer peripheral surface. A plate cylinder on which a stencil sheet is wound and mounted, and a predetermined interval is provided with respect to the outer peripheral surface of the plate cylinder. The plate cylinder is rotatably provided around an axis parallel to the axis of the plate cylinder, and supports the transported printing paper. An impression cylinder, an intermediate pressing roller provided inside the plate cylinder along an axis parallel to the axis of the plate cylinder, and bulging the outer peripheral surface of the plate cylinder to press the stencil sheet against the printing paper; and An adjusting mechanism for changing the relative position between the cylinder and the impression cylinder to adjust the position of the axis between the impression cylinder and the intermediate pressing roller is provided.

According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the adjusting mechanism is parallel or overlapped with the axis of the plate cylinder or the impression cylinder, and the stencil printer or the plate cylinder has A fixed shaft that supports the impression cylinder with respect to the apparatus main body of the stencil printing apparatus, and a support member that is fixed by being movably inserted through the fixed shaft, and moving the support member to form the plate cylinder. The relative position with respect to the impression cylinder is changed.

According to a third aspect of the present invention, there is provided the stencil printing apparatus according to the second aspect, further comprising positioning means for setting a moving amount and a moving direction of the support member.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view showing an example of the stencil printing apparatus of the present invention.

As shown in FIG. 1, the stencil printing apparatus includes a document reading unit 1, a stencil making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharging unit 5, and a stencil discharging unit 6. ing.

The document reading section 1 is disposed above the stencil printing apparatus, and can read a book-bound document (hereinafter referred to as a book document) and a sheet-shaped document (hereinafter referred to as a sheet document). It is configured.

A configuration for reading a book document and a sheet document for each sheet is, for example, an endless belt 9 attached to a pair of rollers 8.
1, a line image sensor 10 that moves in the left-right direction in FIG. 1, a document mounting glass table 11 on which each document is mounted, and an openable and closable mounted on the document mounting glass table 11. Pressure plate 12.

When reading each original, the surface to be read of a book original or a sheet original is placed on the original mounting glass table 1.
1 is placed downward, and pressed from above by the pressure plate 12. Then, the line image sensor 10 is moved. The line image sensor 10 scans at a predetermined speed between the home position A and the scan end position B shown in FIG. As a result, the image of the original on the original placing glass table 11 is read.

Further, the stencil printing apparatus includes an automatic document feeder 13 for sequentially reading a plurality of sheet documents. The automatic document feeder 13 has a document set tray 14 on which a plurality of sheet documents are stacked. The sheet document on the document set tray 14
5 is fed into the automatic document feeder 13 one by one. The line image sensor 10 is moved to the position C (shown in FIG. 1) directly below the automatic document feeder 13 by the moving mechanism and fixedly arranged. As a result, the image of the scanned sheet document is read. After completion of the reading, the sheet document is sent out to the pressure plate 12 outside the automatic document feeder 13.

Next, the stencil making section 2 is constituted by a stencil roll section 17 in which a heat-sensitive stencil sheet M made of a continuous sheet is stored in a roll form, and a plurality of point heating elements arranged in a horizontal line. The thermal head 18, a platen roller 19 disposed opposite to the thermal head 18, each stencil feed roller 20, a stencil guide roller 21, and the stencil cutter 2.
And 2.

The stencil making section 2 feeds the stencil sheet M pulled out from the stencil sheet roll section 17 between the thermal head 18 and the platen roller 19 by the rotation of the platen roller 19. Image information on an image of a document read by the document reading unit 1 is input to the thermal head 18. The thermal head 18 selectively heats each of the point heating elements individually in accordance with the image information, and performs dot matrix heat-sensitive perforation on the stencil sheet M. The document guide roller 21 is provided with a silicon damper or the like serving as a tension applying mechanism at a shaft portion thereof, and appropriately applies tension to the stencil sheet M sent between the thermal head 18 and the platen roller 19. The stencil feed roller 20 sends the stencil sheet M, which has been made, to the plate cylinder 6 side. The stencil sheet M that has been made is cut by the stencil cutter 22 into one plate.

Next, the printing unit 3 mainly includes the plate cylinder 24 and the impression cylinder 2.
Five. The plate cylinder 24 has two disk-shaped side plates 26 disposed at both ends, and these side plates 26 are connected by a rigid clamp base plate 27. A peripheral wall 28 is arranged around each side plate 26.

The peripheral wall 28 is formed by weaving a flexible wire made of a stainless steel wire or the like into a net shape. Therefore, the peripheral wall 28 has flexibility and allows the printing ink to pass therethrough. The peripheral wall 28 is wound around the outer peripheral surface of the side plate 26, one end of which is fixed to the clamp base plate 27, and the other end is connected to the crank base plate 27 via a spring. As described above, the peripheral wall 28 is arranged in a cylindrical shape along the outer peripheral surface of each side plate 26.

A clamp plate 29 serving as a clamp mechanism is rotatably mounted on the clamp base plate 27. The clamp plate 29 clamps one end (tip) of the stencil sheet M conveyed from the plate making section 2. Stencil sheet M
After its tip is locked on the clamp base plate 27 side by the clamp plate 29, it is wound around the outer peripheral surface of the peripheral wall 28.

The plate cylinder 24 is rotatably supported around its own cylindrical axis. This plate cylinder 24
It is rotationally driven in a counterclockwise direction in FIG. 1 by a drive mechanism (not shown).

Inside the plate cylinder 24, an intermediate pressing roller 30 is supported. The intermediate pressing roller 30 extends along an axis parallel to the axis of the plate cylinder 24, and its outer peripheral surface is in sliding contact with the inner peripheral surface of the peripheral wall 24 to bulge and deform the peripheral wall 24. 24 is moved substantially up and down to a steady position where the bulging deformation is released.

In the plate cylinder 24, an intermediate pressing roller 30 is provided.
A doctor rod 31 extending parallel to the outer peripheral surface at a small interval is supported. Ink is supplied from an ink supply unit (not shown) between the intermediate pressing roller 30 and the doctor rod 31 to form a wedge-shaped ink reservoir 32. Then, the ink in the ink reservoir 32 is supplied to the inner peripheral surface of the peripheral wall 28 while being measured while passing through a minute interval with the doctor rod 31 by the rotation of the intermediate pressing roller 30 in the counterclockwise direction in FIG. As described above, the intermediate pressing roller 30 also functions as an ink supply roller that supplies ink to the inner peripheral surface of the peripheral wall 28.

The movement of the intermediate pressing roller 30 in the substantially vertical direction and the rotation of the intermediate pressing roller 30 are the same as those of the above-described conventional technology.
The description is omitted.

The impression cylinder 25 has the same outer diameter as the plate cylinder 24. The impression cylinder 25 is provided with an axis parallel to the axis of the plate cylinder 24 at a predetermined distance from the peripheral wall 28. The impression cylinder 25 is rotatable around its own axis, and rotates clockwise in FIG. 1 in the opposite direction to the plate cylinder 24 as the plate cylinder 24 rotates. Further, the impression cylinder 25 has a concave portion 33 for avoiding interference with the clamp plate 29 for clamping the stencil sheet M on the plate cylinder 24 and the clamp base plate 27 when the impression cylinder 25 rotates. In addition, impression cylinder 2
5 is provided with a paper clamp unit 34 that clamps (supports) the printing paper P in a detachable manner.

Next, the paper supply section 4 has a paper supply table 36 on which the printing paper P is loaded. Printing paper P on paper feed table 36
Are taken out one by one by a paper feed roller 37 and a paper separating roller 38. The taken out printing paper P is sent to the timing roller pair 4 via the upper and lower paper guide members 39.
It is transported to the nip portion of 0. Timing roller pair 40
Sends the printing paper P to the paper biting position by the paper clamping unit 34 of the impression cylinder 25 at a predetermined timing.

Next, the paper discharging section 5 has a paper discharging pinch roller 42 for discharging and conveying the printed printing paper P by a pinch roller function in cooperation with the impression cylinder 25. Further, the paper discharge unit 5 transfers the printing paper P to the impression cylinder 25 when the impression cylinder 25 rotates.
It has a paper separating claw 43 for further separating. The printing paper P separated from the impression cylinder 25 by the paper separating claw 43 is sent out to the flying table 45 by the pair of paper ejection pinch rollers 44. The printing paper P is blown to the paper discharge board 46 by the inclination 45a of the flying board 45 and is stored in a stacked state.

The paper discharge pinch roller 42 and the paper discharge pinch roller pair 44 are arranged so as to be in sliding contact only with the margins (non-print margins) on both sides of the printing paper P, and the ink transferred to the printing paper P is laid on them. Is not reflected. Further, the rollers 42 and 44 are slidably contacted only with the margins on both sides of the printing paper P regardless of the width dimension of the printing paper P.
The position is automatically adjusted according to the size of the printing paper P set on the paper feed table 36. The size of the printing paper P is
The paper size is detected by a paper size sensor (not shown) arranged on the paper feed table 36 of the paper feed unit 4.

Next, the plate discharge section 6 has a plate discharge separation claw 48 for peeling the used stencil sheet M wound around the outer peripheral surface of the plate cylinder 24 from the plate cylinder 24. The stencil sheet M is transferred to the plate cylinder 2
When peeling the stencil sheet M from the stencil sheet M, the clamping of the stencil sheet M by the clamp plate 29 of the plate cylinder 24 is released, and the end of the stencil sheet M opened with the rotation of the plate cylinder 24 is released from the stencil separation claw 48
So that it can be caught. The stencil sheet M caught on the plate discharge separation claw 48 is further rotated by rotation of the plate cylinder 24 so that
4 is peeled off from the outer peripheral surface. Furthermore, the plate removal separation claw 4
The stencil sheet M peeled off by 8 is conveyed by a pair of plate discharging rollers 49 and stored in a plate discharging box 50.

In the stencil printing machine described above, when printing,
Opening the clamp plate 29 and rotating the plate cylinder 24,
The stencil sheet M previously used is removed from the plate cylinder 24 by the
And the plate discharge box 50 with the plate discharge roller pair 49.
Housed within. Thereafter, a series of printing operations are performed. That is, the stencil sheet M for one plate made by the plate making section 2 is conveyed to the plate cylinder 24 side. The leading end of the conveyed stencil sheet M is clamped by the clamp plate 29, and the stencil sheet M is wound around the outer peripheral surface of the peripheral wall 28 by the rotation of the plate cylinder 24 to form a plate. Next, one sheet of the printing paper P on the paper feed table 36 is taken out and transported to the nip portion of the timing roller pair 40.
Next, the timing roller pair 40 feeds the printing paper P to the paper feeding position by the paper clamping unit 34 of the impression cylinder 25 at a predetermined timing. Next, the plate cylinder 24 and the impression cylinder 25 are synchronously rotated, and the peripheral wall 28 is swelled and deformed by the intermediate pressing roller 30, so that the stencil sheet M wound around the plate cylinder 24 is formed.
The printing paper P clamped on the impression cylinder 25 is pressed against the impression cylinder 25. Thereby, the ink that has passed through the perforated portion of the stencil sheet M is transferred to the surface (one surface) of the printing paper P, and printing is performed. Next, with the rotation of the impression cylinder 25, the paper clamp unit 34 releases the clamp of the printing paper P, the printing paper P is separated from the impression cylinder 25 by the paper separating claw 43, and the paper is discharged via the flying table 45. The sheet is discharged to the table 46.

By the way, the above-mentioned plate cylinder 24 can be pulled out from the apparatus main body of the stencil printing apparatus along its own axial direction. The plate cylinder 24 drawn out of the apparatus main body of the stencil printing apparatus constitutes a plate cylinder unit 24A including the plate cylinder 24 itself and a part of a drive transmission mechanism for rotating the plate cylinder 24 and the like.

As shown in FIG. 2, the plate cylinder unit 24A
Has a drive shaft 51, which is a part of the drive transmission mechanism, arranged in parallel with the axis of the plate cylinder 24. The drive shaft 51 includes the plate cylinder 2
The drive gear 52 meshing with the plate cylinder drive teeth 26a provided on the outer peripheral surface of the side plate 26 of No. 4 is fixed. Further, the plate cylinder unit 24A has a center cylinder 53 coaxial with the axis of the plate cylinder 24. These drive shaft 51 and center cylinder 53
Has a tip extending from the plate cylinder unit 24A to the back side facing the apparatus main body in the pull-out direction (axial direction of the plate cylinder 24).

On the other hand, a bearing 54 for inserting the tip of the drive shaft 51 is provided on the apparatus main body side of the stencil printing apparatus. The bearing 54 is rotated by a drive motor (not shown) disposed in the apparatus main body. As a result, the drive shaft 51 inserted therein rotates, and the plate cylinder 24 rotates. A receiving hole 55 into which the tip of the center tube 53 is inserted is provided on the apparatus main body side. By inserting the center cylinder 53 into the receiving hole 55, the back side of the plate cylinder unit 24A is supported.

Further, a shaft 5 as a pair of fixed shafts extending along the axial direction of the plate cylinder 24 is provided on the apparatus main body side.
6 are provided. On the side of the plate cylinder unit 24A, a support member 57 having an insertion hole 61 through which each shaft 56 can be inserted is provided on the near side in the drawing direction. When the plate cylinder unit 24A is housed in the apparatus main body, the shaft 56 is inserted through the support member 57, whereby the front side of the plate cylinder unit 24A is supported.

In other words, the plate cylinder unit 24A is configured such that the center cylinder 53 is inserted into the receiving hole 55 on the back side, and the shaft 56 is inserted through the support member 57 on the front side.
It is supported on the device body side. Thus, plate cylinder unit 2
4A can be pulled out from the apparatus main body, and in a housed state in the apparatus main body side, connects a drive transmission mechanism to the apparatus main body side and is supported on the back side and the near side.

In supporting the plate cylinder unit 24A on the apparatus main body of the stencil printing apparatus, in the present embodiment, one place on the back side (center cylinder 53) and two places on the front side (shaft 56) of the plate cylinder unit 24A. We support in. That is, by supporting the plate cylinder unit 24A at three points, the plate cylinder unit 24A can be stably supported.

In the stencil printing apparatus having the above-described configuration, the plate cylinder 2
4 and the impression cylinder 25 are parallel to each other, and the intermediate press roller 30 and the impression cylinder 25 in the plate cylinder 24 are arranged in parallel to each other. Thereby, the impression cylinder 25 and the intermediate pressing roller 30 are equally spaced in the width in the left-right direction with respect to the transport direction of the printing paper P, and the pressing force in the left-right width direction of the printing paper P at the time of printing becomes uniform. The print density balance in the left-right width direction is kept uniform.

In the stencil printing apparatus of the present invention, when the interval between the impression cylinder 25 and the intermediate pressing roller 30 in the left and right width direction is different due to various factors in the right and left width with respect to the transport direction of the printing paper P, this interval is corrected. And an adjustment mechanism for adjusting the print density balance. Hereinafter, the adjustment mechanism will be described.

FIG. 3 is a schematic view of the plate cylinder unit 24A viewed from the near side. As shown in FIG.
Reference numeral 7 is fixed to the plate cylinder unit 24A by screws 58. Each support member 57 is movable in a direction orthogonal to the axis of the plate cylinder 24 when the screw 58 is loosened and the fixing is released. As a configuration in which the support member 57 moves, the hole through which the screw 58 is inserted may be a large hole into which the screw 58 can be loosely inserted on the plate cylinder unit 24A side or the support member 57 side.

Each support member 57 is positioned with its movement restricted by a positioning member 59 as positioning means. Specifically, as shown in FIG. 3, the support member 57 is formed in a substantially rectangular shape, and the positioning member 59 is formed in a substantially L shape. Then, two sides (a horizontal side 57a and a vertical side 5) of one outer corner portion of the support member 57 are provided.
7b), the two sides (the horizontal side 59a and the vertical side 59b) of the inner corner portion of the positioning member 59 abut against each other,
The support member 57 is positioned.

As shown in FIG. 3, each positioning member 59
Are fixed to the plate cylinder unit 24A by screws 60. Each positioning member 59 is movable in a direction perpendicular to the axis of the plate cylinder 24 when the screw 60 is loosened and the fixing is released. As a configuration in which the positioning member 59 moves, the hole through which the screw 60 is inserted may be a large hole into which the screw 60 can be loosely inserted, on one of the plate cylinder unit 24A side and the positioning member 59 side.

FIG. 4 is a schematic view of the plate cylinder 24, the impression cylinder 25, and the like as viewed from the direction of conveyance of the printing paper P. As shown in FIG. 4, the interval between the impression cylinder 25 and the intermediate pressing roller 30 is different. For example, the trouble side (the left side in FIG. 4) of the plate cylinder unit 24A is
It is assumed that the interval is larger than a desired interval. In this case, impression cylinder 2
On the side where the distance between the roller 5 and the intermediate pressing roller 30 is larger, the pressing force is smaller than on the side where the distance is smaller, and the print density is lower.

At this time, the plate cylinder unit 24A is pulled out of the apparatus main body, and as shown in FIG. 5A, the screw 60 for fixing the positioning member 59 is loosened, so that the positioning member 59 can be moved. Then, the positioning member 59 is moved to the position shown in FIG.
Move up inside. The movement of the positioning member 59 moves the vertical side 59b of the positioning member 59 to the supporting member 57.
Is moved while being in contact with the vertical side 57b. By doing so, the positioning member 59 moves only upward. The amount of movement of the positioning member 59 can be controlled by interposing a gap gauge (not shown) between the horizontal side 59a of the positioning member 59 and the horizontal side 57a of the support member 57.
The moving amount of the positioning member 59 can be set by a predetermined amount corresponding to the gap gauge. Then, each positioning member 59
Is moved in the same manner. After the movement of the positioning member 59, the screw 60 is tightened to fix the positioning member 59.

Next, as shown in FIG. 5B, the screw 58 for fixing the support member 57 is loosened, and the support member 57 is made movable. Then, two sides of the support member 57 (horizontal side 57
a, the vertical side 57b) is the positioning member 59 which has moved earlier.
The support member 57 is moved to a position where it comes into contact with the two sides (the horizontal side 59a and the vertical side 59b). After the movement of the support member 57, the screw 58 is tightened to fix the support member 57. By doing so, the support member 57 moves upward by a predetermined amount.

As described above, the plate cylinder unit 24A with the support member 57 moved is housed in the apparatus main body of the stencil printing apparatus. At this time, since the support member 57 inserted into the shaft 56 is moving upward, the front side of the plate cylinder unit 24A is inclined downward as shown in FIG. At this time, the impression cylinder 25 and the intermediate pressing roller 30 are at equal intervals. Thereby, at the time of printing, the pressing force becomes equal, and the print density balance becomes uniform.

Further, contrary to the state shown in FIG.
When the interval between the intermediate roller 30 and the intermediate pressing roller 30 is smaller than a desired interval on the labor side (the left side in FIG. 4) of the plate cylinder unit 24A, the plate cylinder unit 24A may be inclined upward. In this case, the support member 57 is moved downward.

In order to move the support member 57 downward, the plate cylinder unit 24A is pulled out from the apparatus main body, the screw 58 for fixing the support member 57 is loosened, and the support member 57 is made movable. Then, the support member 57 is moved downward.
The movement of the support member 57 corresponds to the vertical side 57b of the support member 57.
Is moved while being in contact with the vertical side 59b of the positioning member 59. By doing so, the support member 57 moves only downward. The movement amount of the support member 57 is
By interposing a gap gauge (not shown) between the horizontal side 59a of the positioning member 59 and the horizontal side 57a of the support member 57, the support member 57 has a predetermined amount corresponding to the gap gauge.
Can be set. Then, each support member 57 is similarly moved. After the movement of the support member 57, the screw 58 is tightened to fix the support member 57.

Next, the screw 60 for fixing the positioning member 59 is loosened, so that the positioning member 59 can be moved. Then, two sides of the positioning member 59 (horizontal side 59a, vertical side 5
9b) are two sides (horizontal side 5) of the support member 57 that has moved first.
7a, the positioning member 59 is moved to a position where it comes into contact with the vertical side 57b). After the movement of the positioning member 59, the screw 60 is tightened to fix the positioning member 59.

When the plate cylinder unit 24A with the support member 57 moved is housed in the apparatus main body of the stencil printing machine, the support member 57 inserted through the shaft 56 is moved downward. Is inclined upward, and the impression cylinder 25 and the intermediate pressing roller 30 are equally spaced in the left and right width in the transport direction of the printing paper P. Thereby, at the time of printing, the pressing force becomes equal, and the print density balance becomes uniform.

FIG. 7A is a schematic view of the impression cylinder 25 and the intermediate pressing roller 30 as viewed from above in the transport direction of the printing paper P. As shown in FIG. 7A, each axis of the impression cylinder 25 and the intermediate pressing roller 30 may be inclined with respect to the transport direction of the printing paper P due to various factors. In this case, since the stencil sheet M on the plate cylinder 24 is displaced by the conveyance of the printing paper P, and the printed image is distorted or inclined, the axial position of the impression cylinder 25 and the intermediate pressing roller 30 is corrected. There is a need.

At this time, the plate cylinder unit 24A is pulled out of the apparatus main body, and as shown in FIG. 7B, the screw 60 for fixing the left positioning member 59 is loosened, and the left positioning member 59 can be moved. . Then, the positioning member 59
Is moved to the left in FIG. 7B. This positioning member 5
The movement of 9 moves the horizontal side 59a of the positioning member 59 while keeping the horizontal side 57a of the support member 57 in contact with the horizontal side 59a. By doing so, the positioning member 59 moves only to the left. The amount of movement of the positioning member 59 is determined by the vertical side 59 b of the positioning member 59 and the vertical side 5
By interposing a gap gauge (not shown) between the positioning member 59 and the positioning member 59b.
Can be set. After the movement of the positioning member 59, the screw 60 is tightened to fix the positioning member 59.

Next, as shown in FIG. 7C, the screw 58 for fixing the left support member 57 is loosened, and the left support member 57 is made movable. Then, the support member 57 is moved to a position where the two sides (horizontal side 57a, vertical side 57b) of the support member 57 abut on the two sides (horizontal side 59a, vertical side 59b) of the positioning member 59 that has moved earlier. After the movement of the support member 57, the screw 58 is tightened to fix the support member 57. By doing so, the support member 57 moves to the left by a predetermined amount.

As described above, the plate cylinder unit 24A with the support member 57 moved is housed in the main body of the stencil printing machine. At this time, since the support member 57 inserted into the shaft 56 is moved to the left, the front side of the plate cylinder unit 24A is inclined rightward, and the impression cylinder 25 and the intermediate pressing roller 30 are inclined.
Have a parallel arrangement relationship. Thus, during printing, a good printed image can be obtained without the stencil sheet M on the plate cylinder 24 being misaligned due to the transport of the printing paper P.

In FIGS. 7 (b) and 7 (c), the right support member 57 has an insertion hole 61 through which the shaft 56 can be inserted. This is because when the plate cylinder unit 24A is supported by the main body of the stencil printing apparatus, a margin is provided for the insertion of the shaft 56. That is, the positioning of the plate cylinder unit 24A with respect to the apparatus main body side can be performed at one location on the back side and one location on the front side. Therefore, when the plate cylinder unit 24A is moved in the left-right direction as described above, the left support member 57 may be moved. However,
When moving the left support member 57 in the left-right direction, if the amount of movement exceeds the left-right diameter of the insertion hole 61 of the right support member 57, the right support member 57 may be moved.

When the axes of the impression cylinder 25 and the intermediate pressing roller 30 are inclined in the opposite direction to the state shown in FIG. 7A, the left support member 57 shown in FIG. It will be moved to the right.

In order to move the support member 57 rightward, the plate cylinder unit 24A is pulled out of the apparatus main body, and the screw 58 for fixing the support member 57 is loosened, so that the support member 57 can be moved. Then, the support member 57 is moved rightward.
The movement of the support member 57 corresponds to the horizontal side 57a of the support member 57.
Is moved while being in contact with the horizontal side 59a of the positioning member 59. By doing so, the support member 57 moves only to the right. The movement amount of the support member 57 is
By interposing a gap gauge (not shown) between the vertical side 59b of the positioning member 59 and the vertical side 57b of the support member 57, the support member 57 is moved by a predetermined amount corresponding to the gap gauge.
Can be set. After the movement of the support member 57, the screw 58 is tightened to fix the support member 57.

Next, the screw 60 for fixing the positioning member 59 is loosened, so that the positioning member 59 can be moved. Then, two sides of the positioning member 59 (horizontal side 59a, vertical side 5
9b) are two sides (horizontal side 5) of the support member 57 that has moved first.
7a, the positioning member 59 is moved to a position where it comes into contact with the vertical side 57b). After the movement of the positioning member 59, the screw 60 is tightened to fix the positioning member 59.

When the plate cylinder unit 24A with the support member 57 moved is housed in the main body of the stencil printing machine, the axes of the impression cylinder 25 and the intermediate pressing roller 30 are arranged in parallel. Thus, during printing, a good printed image can be obtained without the stencil sheet M on the plate cylinder 24 being misaligned due to the transport of the printing paper P.

As described above, when the interval between the impression cylinder 25 and the intermediate pressing roller 30 in the left-right width direction is different in the left-right width with respect to the transport direction of the printing paper P, the above-described adjustment mechanism corrects this interval to perform printing. It is possible to adjust the density balance. Further, the adjusting mechanism includes the impression cylinder 25 and the intermediate pressing roller 30.
When each of the axes is tilted with respect to the transport direction of the printing paper P, it is possible to correct the position of the axis to prevent the stencil sheet M from being displaced.

Hereinafter, another embodiment of the above-described adjusting mechanism will be described. The adjusting mechanism shown in FIG. 8 has a positioning member 59 serving as a positioning means having a substantially U-shape, and has an integral configuration relating to both support members 57. In this case, the movement of the support member 57 is performed in substantially the same manner as in the above-described embodiment.

The adjusting mechanism shown in FIG.
Positioning dial 62 as positioning means instead of
Is provided. The positioning dial 62 is provided at the tip 6.
2a is configured to contact the horizontal side 57a of the support member 57 to perform positioning. In this case, the movement of the support member 57 is
The tip 62a moves by the rotation of the positioning dial 62, and the moving amount of the support member 57 is determined. If a scale is provided on the positioning dial 62, the movement amount becomes clear. Note that the adjustment mechanism shown in FIG. 9 is configured to move the support member 57 in the up-down direction. However, when the support member 57 is moved in the left-right direction,
The positioning dial 62 which contacts the vertical side 57b may be provided.

The adjusting mechanism shown in FIG. 10 has a structure in which the support member 57 is moved by driving a motor 63. That is, the motor 63 forms a positioning means. Then, the output shaft 63 of the motor 63 is screwed to the support member 57.
In this case, the moving amount of the support member 57 is determined by the driving amount of the motor 63 by using a stepping motor for the motor 63 or providing an encoder. Note that the adjustment mechanism shown in FIG. 10 is configured to move the support member 57 in the up-down direction. However, when the support member 57 is moved in the left-right direction, a motor 63 for moving the support member 57 in the left-right direction is provided. Good. In this case, one motor 63 that moves in the up-down direction or the left-right direction is driven by the other motor 63,
It is configured to move together with the support member 57.

In the adjusting mechanism having the structure shown in FIGS. 9 and 10, it is not necessary to use a gap gauge as in the adjusting mechanism of the above-described embodiment including the structure shown in FIG. Further, the adjustment mechanism shown in FIG. 10 can perform each adjustment while the plate cylinder unit 24A is housed in the apparatus main body.

In all of the above-described embodiments, the support member 57 that passes through the shaft 56 that supports the plate cylinder unit 24A is configured to move. However, the present invention is not limited to this. In addition, for example, instead of the shaft 56, a center cylinder 53 overlapping with the axis of the plate cylinder 24 is also extended to the near side to serve as a fixed shaft, and this center tube 53 on the near side is used as the support member 5
7 may be supported. By moving the support member 57 to move the central cylinder 53 on the near side, the relative position between the plate cylinder 24 and the impression cylinder 25 is changed, and the positional relationship between the axis of the impression cylinder 25 and the intermediate pressing roller 30 can be corrected. .

In all the above-described embodiments, the arrangement relationship between the axis of the impression cylinder 25 and the axis of the intermediate pressing roller 30 is corrected by moving the plate cylinder 24 (the plate cylinder unit 24A). 25, the impression cylinder 2
It is possible to correct the positional relationship between the axis of 5 and the axis of the intermediate pressing roller 30. In this case, one end of the axis of the impression cylinder 25 rotatably provided in the apparatus main body is configured to be moved. For example, although not shown, the rotation axis of the impression cylinder 25 supported by the apparatus main body is fixed to a fixed axis. An adjustment mechanism similar to that of each of the above-described embodiments may be provided so that one end of the rotation shaft can be moved.

Therefore, in the stencil printing apparatus having the above-described configuration, the positional relationship between the axis of the impression cylinder 25 and the intermediate pressing roller 30 is corrected by the adjusting mechanism provided outside the plate cylinder 24 or the impression cylinder 25 or the impression cylinder. This is performed by moving one end of the 25 axis. As a result, the configuration inside the plate cylinder can be simplified,
It is possible to reduce intersections between parts and assembly intersections, which are factors that shift the positional relationship between the axis of the impression cylinder 25 and the axis of the intermediate pressing roller 30.

Further, since the adjusting mechanism is provided outside the plate cylinder 24, ink does not adhere to the adjusting mechanism, so that serviceability at the time of maintenance or the like can be improved.

Since the adjusting mechanism does not move the intermediate pressing roller 30 itself, it is possible to improve the rigidity of the mechanism in the plate cylinder 24 for raising and lowering the intermediate pressing roller 30 during printing.

[0075]

As described above, the stencil printing apparatus according to the present invention is provided with an adjusting mechanism for adjusting the position of the axis between the impression cylinder and the intermediate pressing roller by changing the relative position between the plate cylinder and the impression cylinder. Therefore, when the interval between the impression cylinder and the intermediate pressing roller differs in the left and right widths with respect to the transport direction of the printing paper, this can be corrected to make the print density balance uniform.

Further, since this adjusting mechanism is provided outside the plate cylinder in order to change the relative position between the plate cylinder and the impression cylinder, the configuration inside the plate cylinder can be simplified, and the structure of the impression cylinder and the intermediate pressing roller can be simplified. It is possible to reduce the intersection of each part and the assembly intersection, which cause a shift in the positional relationship between the axes. Further, by providing the adjusting mechanism outside the plate cylinder, ink does not adhere to the adjusting mechanism, so that serviceability during maintenance or the like can be improved.

Further, since the adjusting mechanism is not configured to move the intermediate press roller itself, the rigidity of the mechanism in the plate cylinder for raising and lowering the intermediate press roller during printing can be improved.

Further, in the stencil printing apparatus of the present invention, since the relative position between the plate cylinder and the impression cylinder is changed by the adjusting mechanism, even when each axis of the impression cylinder and the intermediate pressing roller is inclined with respect to the transport direction of the printing paper, This axis position can be corrected.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a stencil printing apparatus of the present invention.

FIG. 2 is a perspective view showing a plate cylinder unit.

FIG. 3 is a schematic view of the plate cylinder unit as viewed from the near side.

FIG. 4 is a schematic diagram of a plate cylinder, an impression cylinder, and the like, as viewed from a direction in which a printing sheet is transported.

FIGS. 5A and 5B are schematic diagrams showing the operation of an adjustment mechanism.

FIG. 6 is a schematic diagram showing a state after correction by an adjustment mechanism.

FIG. 7 is a schematic view of the impression cylinder and the intermediate pressing roller as viewed from above in the transport direction of the printing paper P.

FIG. 8 is a schematic view showing another example of the adjustment mechanism.

FIG. 9 is a schematic view showing another example of the adjustment mechanism.

FIG. 10 is a schematic view showing another example of the adjustment mechanism.

FIG. 11 is a side view showing a conventional stencil printing apparatus.

[Explanation of symbols]

24: plate cylinder, 25: impression cylinder, 30: middle press roller, 56:
Shaft (fixed shaft), 57: support member, 59: positioning member (positioning means), 62: positioning dial (positioning means), 63: motor (positioning means), M: stencil sheet, P: printing paper.

Claims (3)

[Claims] 1. A plate cylinder which is formed in a cylindrical shape so as to rotate around its own axis, and on which a stencil sheet having a stencil made thereon is wound and mounted on its outer peripheral surface, and a predetermined interval is provided between the outer peripheral surface of the plate cylinder. An impression cylinder that is provided rotatably around an axis parallel to the axis of the plate cylinder and supports the transported printing paper, and is provided along an axis parallel to the axis of the plate cylinder within the plate cylinder, An intermediate pressing roller that swells the outer peripheral surface of the plate cylinder and presses the stencil sheet against the printing paper, and changes the relative position between the plate cylinder and the impression cylinder to change the axis of the impression cylinder and the intermediate pressing roller. A stencil printing machine, comprising: an adjusting mechanism for adjusting a position. 2. The fixing mechanism according to claim 1, wherein the adjusting mechanism is parallel or overlapped with an axis of the plate cylinder or the impression cylinder, and supports the plate cylinder or the impression cylinder with respect to an apparatus body of a stencil printing apparatus. 2. A support member, which is fixed so as to be movable while being inserted through a shaft, wherein the relative position between the plate cylinder and the impression cylinder is changed by moving the support member. Stencil printing machine. 3. The stencil printing apparatus according to claim 2, further comprising positioning means for setting a moving amount and a moving direction of the support member.