JP4027484B2 - Stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus, and more particularly, to a stencil printing apparatus of a type capable of adjusting an image position in a direction perpendicular to a paper traveling direction.
[0002]
[Prior art]
In a stencil printing apparatus, a master made by plate making is wound around a rotatable porous and cylindrical plate cylinder, and the sheet is continuously pressed against the plate cylinder by a pressing means such as a press roller. Printing is performed by causing the ink supplied from the ink supply means to ooze out from the opening of the plate cylinder and the master perforation. The plate cylinder has a structure in which a mesh screen made of a resin or metal mesh is wound around a porous support cylinder.
The master is formed in a laminate structure in which a thermoplastic resin film having a thickness of approximately 1 to 3 μm is bonded with a Japanese paper fiber or a synthetic fiber as a porous support, or a mixture of a Japanese paper fiber and a synthetic fiber. Master plate making is performed by melting and perforating the film surface in contact with a heating element of a thermal head driven on the basis of information of an original image, and is called a heat sensitive digital method.
[0003]
Generally, a fully automatic type stencil printing apparatus that automatically performs plate making, printing, and plate removal is used.
In this fully automatic type stencil printing apparatus, a document of an image to be printed is set in a reading device and read by a scanner unit of the reading device. In the scanner unit, the density of the image is converted into an electric signal by a CCD or the like. Based on the read information, the master is punched by a plate making apparatus equipped with a thermal head, a platen roller, and the like, and the master that has been made is automatically wound around the plate cylinder. The paper fed from the paper feeder is continuously pressed against the plate cylinder by the pressing means, and the ink supplied from the inside of the plate cylinder oozes out from the opening of the plate cylinder and the master perforation and is transferred to the paper for printing. Is made.
The plate cylinder itself has a certain degree of flexibility, and the portion where the plate cylinder is sandwiched between the ink roller and the pressing means, which are components of the ink supply means provided inside the plate cylinder, is substantially transferred. Parts. That is, the ink roller as a rigid body and the pressing means are opposed to the plate cylinder, and the portion of the plate cylinder in contact with the pressing means is backed up by the ink roller and is prevented from being deformed.
[0004]
In addition to stencil printing, when printing using a printing device, you can check whether the image of the printed material is misaligned with respect to the original document, or print called test printing to align the printed image with the target position A check is made.
If there is no problem in image misalignment or alignment in this print check, the process proceeds to the next printing step. If there is a misalignment or the like, in order to correct it, the paper traveling direction (hereinafter referred to as “ The image position is adjusted in a direction perpendicular to the traveling direction (hereinafter referred to as “left-right direction”).
An electrostatic copying machine (PPC) or the like does not use a master, so the image position of a copy can be corrected in a short time and easily by moving the original position. Then, when the document is moved, it is necessary to make the plate again, so that it takes time and the master before being wound around the plate cylinder is wasted.
For this reason, the image position is corrected by changing the relative position between the sheet and the master.
[0005]
As an adjustment of the image position in the vertical direction in a stencil printing apparatus or the like, a method of changing the paper feeding timing with respect to the rotation of the plate cylinder is generally used as disclosed in, for example, Japanese Patent Laid-Open No. 50-66308. It is used.
On the other hand, as the adjustment of the image position in the left-right direction, as disclosed in, for example, Japanese Patent Laid-Open No. 63-218435, the paper loaded on the paper feed table is shifted in the left-right direction together with the paper feed table with a knob or a lever. The method is known.
This will be briefly described. As shown in FIG. 10, the sheet P loaded on the sheet feeding table 100 having the side fences 100a and 100a is made with the plate cylinder 102 wound around the plate cylinder 102 together with the sheet feeding table 100. It is shifted in the left-right direction (arrow L direction) with respect to the master 104. Reference numeral 106 denotes a plate-making image formed on the master 104.
[0006]
However, when the image position is adjusted by shifting the paper feed base in the left-right direction, a side plate for aligning the side edges of the paper is disposed on the paper discharge tray on which the printed paper is stacked. If the position of the sheet is shifted, the sheet may be caught on the side plate when the sheet is discharged, and a sheet discharge jam is likely to occur.
For this reason, it is possible to prevent the occurrence of paper jam by moving the side plate according to the amount of movement of the paper feed table, but the adjustment work is performed independently for the paper feed plate and the side plate. Therefore, the adjustment between the two adjustments is delicate and the adjustment work is troublesome. A method of simultaneously adjusting the paper feed tray and side plate by an interlocking mechanism is also conceivable, but depending on the amount of paper loaded, the paper feed tray may become heavy, avoiding the problem of large equipment and increased costs. Absent.
In addition, this moving method such as a paper feed tray has a problem that a large adjustment force is required when a large amount of paper is stacked on the paper feed tray, and the paper alignment is shifted during the movement. .
[0007]
As a method for adjusting the image position in the left-right direction without shifting the sheets loaded on the sheet feed table, for example, a technique described in Japanese Utility Model Publication No. 64-46258 is known.
This allows the entire plate cylinder unit including the ink supply means to be moved in the axial direction of the plate cylinder, that is, in the left-right direction, and shifts the position of the master with respect to the paper.
According to this method, since there is only one adjustment object, there is no difficulty due to the delicateness of adjustment as in the above-described adjustment method of the paper feed table.
However, since the entire plate cylinder unit is displaced, there is a problem in that the moving structure and the unit holding structure cannot be increased in size and weight, and the cost increases.
[0008]
Japanese Patent Laid-Open No. 9-104159 proposes a technique for adjusting the image position in the left-right direction by shifting only the plate cylinder in the axial direction. According to this technique, since the ink supply means and the like are configured to move only the plate cylinder as it is, compared with the technique described in Japanese Utility Model Publication No. 64-46258, the moving structure is reduced in size and weight. Can be realized.
[0009]
[Problems to be solved by the invention]
In general, the width of the opening of the plate cylinder, that is, the width in the left-right direction of the porous region is the same as the width in the axial direction of the ink roller, and the plate cylinder is pressed through the paper by pressing means such as a press roller. When this is done, ink passes through the opening from the region where the outer peripheral surface of the ink roller is in contact with the inner peripheral surface of the plate cylinder and is supplied to the master.
Since the non-opening area of the plate cylinder that is removed from the end surface of the ink roller is pressed by the pressing means, there is no drag due to the backup of the ink roller, and only deformation due to the flexibility of the plate cylinder occurs. The pressing force between the pressing means is also smaller than that of the opening. For this reason, the phenomenon of so-called “side leakage” in which the ink sandwiched between the two surfaces is pushed out by the dense surfaces and protrudes from the sides of the master does not occur.
Therefore, this side leakage phenomenon does not occur in the technique described in Japanese Utility Model Laid-Open No. 64-46258 in which the plate cylinder and the ink roller move together.
[0010]
However, in the configuration in which only the plate cylinder is moved as in the technique described in Japanese Patent Laid-Open No. 9-104159, the non-opening area (dense surface) of the plate cylinder is backed up by the ink roller, so that the pressing force is As a result, the ink exuded by the ink did not escape and was pushed out in the axial direction of the plate cylinder, causing the side leakage phenomenon.
If side leakage occurs, the non-printing area of the master, the pressing means, etc. may be soiled with ink, and the printing paper may be soiled.
[0011]
Therefore, the present invention provides a stencil printing apparatus capable of solving the above-mentioned contamination problem due to side leakage while having a “configuration that moves only the plate cylinder” that can easily adjust the image position in the left-right direction. And its purpose.
[0012]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention is configured to positively provide a space for the excess ink to be extended or to prevent the escape of the excess ink. Specifically, in the first aspect of the present invention, a porous and cylindrical plate cylinder having an ink supply unit therein, a pressing unit disposed opposite to the plate cylinder, and the pressing unit is opposed to the pressing unit. A pressing member provided along the axial direction in the plate cylinder and a backup member for supporting the inner surface of the plate cylinder when the plate cylinder abuts, and a preprinted master is wound around the plate cylinder. In the stencil printing apparatus for performing printing by sandwiching the fed paper between the plate cylinder and the pressing means and causing ink to ooze out from the opening of the plate cylinder and the master perforation part, the plate cylinder is moved in the axial direction. Is provided so as to be movable,A direction that extends in the circumferential direction of the plate cylinder in the axial direction of the opening in the axial direction of the plate cylinder and that is substantially perpendicular to the axial direction of the plate cylinder extending in the axial direction of the plate cylinder of the master A weir member was provided to raise, Is adopted.
  Here, the “opening” refers to a region where a hole exists (the same applies hereinafter).
[0014]
  Claim2In the described invention, a porous and cylindrical plate cylinder having an ink supply means therein, a pressing means arranged to face the plate cylinder, and a shaft in the plate cylinder facing the pressing means. And a backup member that supports the inner surface of the plate cylinder when the pressing means and the plate cylinder abut on each other. The master that has been subjected to plate making is wound around the plate cylinder, and the fed paper is In a stencil printing apparatus for performing printing by oozing ink from an opening portion of a plate cylinder and a master perforation portion sandwiched between a plate cylinder and a pressing means, the plate cylinder is provided so as to be movable in the axial direction, and A configuration is adopted in which a groove extending in the circumferential direction of the plate cylinder is provided on the inner surface of the edge position of the opening in the axial direction of the plate cylinder.
[0015]
  Claim3In the described invention, the claims1 or 2In the described configuration, the backup member is an ink roller.
[0016]
  Claim4In the described invention, claims 1 to3In the configuration described in any one of the above, the configuration in which the plate cylinder is moved in the axial direction includes a screw portion formed on a rotation shaft of the plate cylinder and a screw portion screwed into the screw portion and a gear portion on the outer surface. A movable member, a drive gear meshing with a gear portion of the movable member, and a drive source for driving the drive gear, and the plate cylinder is rotatably supported by the movable member via a bearing. The structure is adopted.
[0018]
【Example】
  Embodiments of the present invention will be described below with reference to the drawings.First, a reference example will be described.
  BookreferenceAs shown in FIG. 1, the stencil printing apparatus in the example includes a plate making unit 2, a printing unit 4, and the like. In the plate making section 2, a master 6 is wound around a core material 8 and provided in a roll shape, and the core material 8 is rotatably held by holder means (not shown). The master 6 is pressed against a platen roller 10 rotatably supported by a plate making unit side plate (not shown) by a heat generating surface of a thermal head 12 having a number of heating elements, and the platen roller 10 is rotated clockwise by a stepping motor (not shown). Is driven out from the roll state. Although not explicitly shown, the master 6 has a laminate structure in which a thermoplastic resin film having a thickness of about 1 to 3 μm is bonded with a Japanese paper fiber or a synthetic fiber as a porous support, or a mixture of a Japanese paper fiber and a synthetic fiber. Is formed.
  The thermal head 12 is urged by a spring member (not shown), which serves as a pressing force against the platen roller 10.
[0019]
  On the downstream side of the platen roller 10 in the master conveyance direction, a pair of feed rollers 14 and 14 having a conveyance speed faster than the conveyance speed of the platen roller 10 are rotatably supported by a plate making unit side plate (not shown) in a state where they are pressed against each other. A predetermined tension is applied to the master 6 while sliding with the master 6. A cutter 16 for cutting the master 6 to an appropriate length and a guide plate 18 for guiding the master 6 are provided on the downstream side of the pair of feed rollers 14 and 14, and the guide plate 18 is a plate making unit side plate (not shown). It is fixed between. BookreferenceThe cutter 16 in the example is a guillotine type composed of an upper blade 16a and a lower blade 16b. In addition to this, a rotary blade moving type or the like can be adopted as the cutter 16.
  The above is the main component of the plate making unit 2.
[0020]
The printing unit 4 is mainly composed of a plate cylinder 20 provided on the lower right side of the plate making unit 2 and a press roller 22 as pressing means provided below the plate cylinder 20 so as to be able to contact with and separate from the plate cylinder 20. In the right side of the plate cylinder 20, a pair of registration rollers 24 and 24 are provided on the right side of the plate cylinder 20 for feeding a sheet P fed from a sheet feeding unit (not shown) between the plate cylinder 20 and the press roller 22 at a predetermined timing. It has been. The press roller 22 is rotatably supported by an arm (not shown), and selectively comes into contact with the plate cylinder 20 when the paper P is fed. Further, at least the surface of the press roller 22 is formed of an elastic material.
Although not explicitly shown, the plate cylinder 20 has a configuration in which a mesh screen made of a resin or a metal net is wound around a porous support cylindrical body.
An ink supply means 26 is provided inside the plate cylinder 20. The ink supply means 26 includes an ink pipe 28 for introducing ink sucked from an ink pack or the like provided outside the plate cylinder 20 into the plate cylinder 20, an ink roller 30 as a backup member, an ink roller The doctor roller 32 is provided with a slight gap between the outer peripheral surface 30 and the outer peripheral surface 30.
A supply hole 28 a is formed in the ink pipe 28, and the ink dropped from here is accumulated in a wedge-shaped space between the ink roller 30 and the doctor roller 32 to form an ink reservoir 34. The ink in the ink reservoir 34 is kneaded by the rotation of the ink roller 30 and the doctor roller 32, and is supplied to the surface of the ink roller 30 while the layer thickness is regulated by the doctor roller 32. The ink held by the ink roller 30 is supplied to the inner peripheral surface of the plate cylinder 20.
[0021]
A stage 36 made of a magnetic material is provided along one generatrix of the plate cylinder 20 on the surface of the non-opening portion where the hole of the plate cylinder 20 does not exist. A clamper 38 is provided for sandwiching. The clamper 38 includes a clamper shaft 40 provided in parallel to the stage 36 and rotatably supported, and a clamper main body 42 fixed to the clamper shaft 40. A magnet is attached to the clamper main body 42. It has been. The clamper 38 is opened and closed at a predetermined position by an opening / closing device (not shown).
[0022]
As shown in FIG. 2, the plate cylinder 20 is fixed to the left and right flanges 44 and 46, which are rotatably supported by the ink pipe 28, and is driven to rotate clockwise by a drive motor (not shown). An ink pipe 28 as a rotating shaft of the plate cylinder 20 is supported on the main body side plates 48 and 50. The ink roller 30 is rotatably supported by a pair of brackets 52 and 52 fixed to the ink pipe 28 via a shaft portion 30a, and is the same in synchronism with the plate cylinder 20 by drive transmission means such as a gear and a belt (not shown). It is rotationally driven in the direction.
[0023]
A threaded portion 54 of a male screw is formed on one side of the ink pipe 28, and a gear boss 56 as a movable member is screwed to the threaded portion 54. The flange left 44 is supported by a gear boss 56 via a bearing 58, whereby the plate cylinder 20 can move integrally with the gear boss 56 and can rotate independently of the gear boss 56.
The gear boss 56 has a gear portion 60, and a drive gear 62 is engaged with the gear portion 60. The drive gear 62 is fixed to a rotating shaft 64 a of a drive motor 64 as a drive source fixed to the main body side plate 48. The drive motor 64 has a built-in sensor, and generates a signal corresponding to the rotation angle.
The screw portion 54, the gear boss 56, the drive gear 62, and the drive motor 64 form a configuration for moving the plate cylinder 20 in the axial direction (left-right direction).
[0024]
As shown in FIG. 2, the width B from the end surface 30 b of the ink roller 30 to the edge of the opening 20 a of the plate cylinder 20 is set to be larger than the maximum movement width A of the plate cylinder 20.
[0025]
Adjustment of the plate cylinder 20 in the left-right direction is performed by a control unit that controls the printing operation of the stencil printing apparatus. As shown in FIG. 3, a signal from a left / right adjustment amount setting means 68 provided on an operation panel (not shown) is output to the control means 66 comprising a CPU and the like, and the left and right home positions of the plate cylinder 20 are set. A signal from the home position detection sensor 70 to be detected is output. The control means 66 transmits a signal to the motor driver 72 to drive the drive motor 64.
[0026]
Next, the printing operation of the above stencil printing apparatus will be described.
When a document is set in a document reading unit (not shown) and a start signal is output (such as a start button is pressed), the control unit 66 positions the plate cylinder 20 at the home position based on information from the home position detection sensor 70. The drive motor 64 is driven until When the plate cylinder 20 is located at the home position, the drive motor 64 is stopped.
While the plate cylinder 20 is rotated by a drive motor (not shown), a used master (not shown) is peeled off from the surface of the plate cylinder 20 by a plate removal apparatus (not shown) and discarded. The plate cylinder 20 rotates and stops until the clamper 38 is in a position almost directly above. When the plate cylinder 20 is stopped, the clamper 38 is opened by an opening / closing device (not shown) to enter a plate feeding standby state.
The heating element of the thermal head 12 is energized in pulses in accordance with the image information of the original reading unit, and the thermal head 12 operates in the main scanning direction. Further, a stepping motor (not shown) rotates, the master 6 is conveyed in the sub-scanning direction by the platen roller 10 and the feed roller pairs 14 and 14, and the thermoplastic resin film of the master 6 is heated and perforated to perform plate making.
[0027]
The front end of the master 6 is guided between the stage 36 and the clamper main body 42 by the guide plate 18. When it is determined from the number of steps of a stepping motor (not shown) that the tip of the master 6 has reached the stage 36, the clamper body 42 is rotated by an opening / closing device (not shown), the clamper 38 is closed, and the tip of the master 6 is clamped. Then, the plate cylinder 20 resumes rotating at a speed substantially the same as the master conveyance speed, and the master 6 thus made is wound. When it is determined from the number of steps of the stepping motor (not shown) that the plate making is completed, the cutter 16 is operated, the master 6 that has been made is cut, and the platen roller 10 and the pair of feed rollers 14 and 14 are stopped. The cut master 6 is drawn out by the plate cylinder 20 and the winding onto the plate cylinder 20 is completed.
[0028]
When the pre-printed master 6 has been wound around the plate cylinder 20, the sheet P is separated and fed from a sheet feeding device (not shown) and is timed by the pair of registration rollers 24 and 24 to press the plate cylinder 20. It is inserted between the rollers 22. When feeding of the paper P is detected by the paper detection means (not shown), the locking means (not shown) is released, the press roller 22 is raised, and the paper P is continuously pressed against the plate cylinder 20. As a result, the master 6 that has been pre-rolled is brought into close contact with the plate cylinder 20, and the paper P is peeled off by a paper discharge claw or the like (not shown) and discharged to a paper discharge tray.
By this trial printing operation, the preprinted master 6 that has been wound is plate-filled with ink, and the press roller 22 is separated to return to the initial position, thereby entering a print standby state.
[0029]
Thereafter, the print image position is checked with the original image position, and if there is a deviation in the vertical direction, a command is issued from an operation panel (not shown), and the paper feed timing of the paper P to the plate cylinder 20 is changed.
If there is a positional deviation in the left-right direction, the adjustment amount is set by the left-right adjustment amount setting means 68 by the operator. In accordance with this adjustment amount, the control means 66 drives the drive motor 64 to move the plate cylinder 20 in the axial direction.
By setting the width of the opening 20a of the plate cylinder 20, the end edge of the opening 20a is always outside the end surface of the ink roller 30 as a backup member in the axial direction of the plate cylinder 20, so that the press roller 22 abuts. Sometimes there will be holes in the surface of the plate cylinder 20 supported by the ink roller 30. For this reason, even if the ink that has oozed out is extended by the pressing force, the hole becomes an escape place of the ink, and the ink is pushed back into the plate cylinder 20 through the hole. Therefore, side leakage does not occur. The same applies to the other end in the left-right direction.
Note that side leakage can be prevented even if the width B from the end surface 30b of the ink roller 30 shown in FIG. 2 to the edge of the opening 20a of the plate cylinder 20 is equal to the maximum movement width A of the plate cylinder 20. .
[0030]
  Next, based on FIG. 4 and FIG.The present inventionofFirstExamples will be described. The abovereferenceThe same parts as those in the example are denoted by the same reference numerals, and the description of the configuration and function will be omitted as appropriate (the followingotherThe same in the examples).
  the abovereferenceThe difference from the example is that the width of the opening 20a of the plate cylinder 20 is the same as the width of the ink roller 30 as in the prior art, and the weir member 74 is provided on the outer surface of the edge position of the opening 20a. The weir member 74 is formed of a synthetic resin sheet material having a thickness of approximately 0.05 to 0.2 mm, and is provided so as to extend in the circumferential direction of the plate cylinder 20.
  In other words, the weir member 74 is provided on the outer surface of the non-opening 20b with its one axial end aligned with the edge of the opening 20a.
[0031]
When the plate cylinder 20 is adjusted to be shifted to the right and the press roller 22 contacts the plate cylinder 20, the non-opening portion 20b (dense surface) of the plate cylinder 20 is the ink roller 30 as shown in FIG. Since the ink exuded by the pressing force tends to be extended in the axial direction, the ink path is blocked by the dam member 74 and bent at a right angle, so that the ink is extended. Disappears at the position of the weir member 74. Therefore, side leakage does not occur.
Generally, since a dam element for preventing ink leakage from the rear end of the opening 20a is provided, the dam element at the rear end and the dam member 74 at the side edge are connected to form a U-shape. It is desirable to surround 20a.
[0032]
  Next, based on FIG. 6 and FIG.Another referenceAn example will be described.
  The difference from the above reference example is that the width of the opening 20a of the plate cylinder 20 is the same as the width of the ink roller 30 as in the prior art, and a pillow member 76 is provided on the inner surface of the edge of the opening 20a. .
  The pillow member 76 is formed of a synthetic resin sheet material having a thickness of approximately 0.05 to 0.2 mm, and is provided so as to extend in the circumferential direction of the plate cylinder 20.
  In other words, the pillow member 76 is provided on the inner surface of the non-opening portion 20b with one axial end thereof aligned with the edge of the opening portion 20a.
[0033]
When the plate cylinder 20 is adjusted to be shifted to the right and the press roller 22 contacts the plate cylinder 20, the ink roller 30 rides on the pillow member 76 as shown in FIG. The edge of 20a is lifted, and a triangular gap 78 is formed between the ink roller 30 and the edge of the opening 20a. Since the gap 78 does not come into contact with the outer peripheral surface of the ink roller 30, the pressure is reduced, and excess ink is pushed back into the gap 78. This prevents side leakage.
[0034]
  Next, based on FIG. 8 and FIG.2Examples will be described.
  The difference from the above reference example is that the width of the opening 20a of the plate cylinder 20 is the same as the width of the ink roller 30 as in the prior art, and the groove 80 is provided on the inner surface of the edge position of the opening 20a. The groove 80 is provided so as to extend in the circumferential direction of the plate cylinder 20.
  When adjustment is made to shift the plate cylinder 20 to the right, and the press roller 22 contacts the plate cylinder 20, the groove 80 does not come into contact with the outer peripheral surface of the ink roller 30 as shown in FIG. The excess ink is pushed back into the groove 80. This prevents side leakage.
  The depth of the groove 80 is about 0.05 to 0.15 mm.
[0035]
In each of the above-described embodiments, the configuration in which the ink roller 30 also serves as a backup member is shown. However, a configuration in which a backup member is provided separately from the ink roller 30 may be employed. In each of the above embodiments, the pressing unit is configured to be in contact with and separated from the plate cylinder. However, the backup member may be movable to be in contact with the pressing unit. Further, as the pressing means, an impression cylinder having the same diameter as the plate cylinder may be used.
[0036]
【The invention's effect】
  According to the invention of claim 1, in the configuration in which only the plate cylinder is moved in the axial direction to adjust the image position in the left-right direction,A direction that extends in the circumferential direction of the plate cylinder in the axial direction of the opening in the axial direction of the plate cylinder and that is substantially perpendicular to the axial direction of the plate cylinder extending in the axial direction of the plate cylinder of the master Since it is configured to provide a weir member to be raised, even if the pressing means and the plate cylinder are in contact with each other, even if the excess ink is extended in the axial direction, it is blocked by the weir member,As a result, side leakage can be prevented. Therefore, the merit of the method of moving only the plate cylinder can be fully utilized.
  In addition, since the width of the opening is not changed, a master having the same width as the conventional one can be used.
[0038]
  Claim2According to the invention described above, in the configuration in which only the plate cylinder is moved in the axial direction to adjust the image position in the left-right direction, the circumferential direction of the plate cylinder on the inner surface of the edge position of the opening in the axial direction of the plate cylinder Therefore, when the pressing means and the plate cylinder are in contact with each other, excess ink is pushed back into the plate cylinder through the groove, even if the excess ink is forced to extend in the axial direction. Leakage can be prevented. Therefore, the merit of the method of moving only the plate cylinder can be fully utilized.
  In addition, since the width of the opening is not changed, a master having the same width as the conventional one can be used.
[0039]
  Claim3According to the described invention, since the backup member is the ink roller of the existing element,1 or 2In addition to the above effects, the configuration in the plate cylinder can be simplified as compared with the case where a separate backup member is provided.
[0040]
  Claim4According to the described invention, the configuration for moving the plate cylinder in the axial direction includes a screw portion formed on the rotation shaft of the plate cylinder, a movable member screwed into the screw portion and having a gear portion on the outer surface, Since the drive gear that meshes with the gear portion of the movable member and the drive source that drives the drive gear,3In addition to any one of the effects, the moving configuration can be simplified.
[0041]
According to the sixth aspect of the present invention, the configuration in which the plate cylinder is moved in the axial direction is a movable portion having a screw portion formed on the rotating shaft of the plate cylinder and a gear portion screwed on the screw portion and having an outer surface. In addition to the effect of the first, second, third, fourth, or fifth aspect, the moving structure is provided. The member includes a drive gear that meshes with a gear portion of the movable member, and a drive source that drives the drive gear. It can be simplified.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a stencil printing apparatus according to a reference example of the present invention.
FIG. 2 is a side cross-sectional view of the main part of the stencil printing apparatus shown in FIG.
FIG. 3 is a control block diagram of the stencil printing apparatus shown in FIG.
FIG. 4 is a side sectional view of a main part in the first embodiment.
5 is a cross-sectional view of the main part of the side surface during printing in the example shown in FIG.
[Fig. 6]Another reference exampleFIG.
7 is a cross-sectional view of a main part of a side surface during printing in the example shown in FIG.
FIG. 82It is side surface principal part sectional drawing in the Example.
9 is a cross-sectional view of the main part of the side surface during printing in the example shown in FIG.
FIG. 10 is a plan view of a conventional paper movement method.
[Explanation of symbols]
20 version cylinder
20a opening
22 Pressing means
26 Ink supply means
30 Ink roller as backup member
54 Screw part
56 Gear boss as a movable member
60 Gear section
62 Drive gear
64 Drive motor as drive source
74 Weir member
76 Pillow
80 groove
A Maximum travel width
B Width to the edge of the opening
P paper

Claims (4)

A porous and cylindrical plate cylinder having ink supply means therein, a pressing means disposed opposite to the plate cylinder, and provided in the plate cylinder along the axial direction facing the pressing means A back-up member that supports the inner surface of the plate cylinder when the pressing means abuts the plate cylinder, and a preprinted master is wound around the plate cylinder to feed the fed paper to the plate cylinder and the pressing means. In a stencil printing apparatus that performs printing by oozing ink from the opening of the plate cylinder and the master perforation part between
The plate cylinder is provided so as to be movable in its axial direction, and extends in the circumferential direction of the plate cylinder on the outer edge position of the opening in the axial direction of the plate cylinder in the axial direction of the master of the plate cylinder. A stencil printing apparatus, comprising a weir member for raising an end portion in a direction substantially orthogonal to the axial direction of the plate cylinder. A porous and cylindrical plate cylinder having ink supply means therein, a pressing means disposed opposite to the plate cylinder, and provided in the plate cylinder along the axial direction facing the pressing means A back-up member that supports the inner surface of the plate cylinder when the pressing means abuts the plate cylinder, and a preprinted master is wound around the plate cylinder to feed the fed paper to the plate cylinder and the pressing means. In a stencil printing apparatus that performs printing by oozing ink from the opening of the plate cylinder and the master perforation part between
A stencil printing apparatus, wherein the plate cylinder is provided so as to be movable in the axial direction, and a groove extending in the circumferential direction of the plate cylinder is provided on the inner surface of the edge of the opening in the axial direction of the plate cylinder. . 3. The stencil printing apparatus according to claim 1 , wherein the backup member is an ink roller . The configuration in which the plate cylinder is moved in the axial direction includes a screw portion formed on the rotating shaft of the plate cylinder, a movable member screwed into the screw portion and having a gear portion on the outer surface, and a gear of the movable member. 4. A drive gear meshing with a portion and a drive source for driving the drive gear, wherein the plate cylinder is rotatably supported by the movable member via a bearing. The stencil printing apparatus according to any one of the above.

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