JP2001080190A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive and deliver a printing sheet without damaging printing of high pixel area ratio without printing fault at the sheet having a strong drape. SOLUTION: A plate cylinder 16 and a paper cylinder 17 are rotatably provided. A sheet clamping unit 21 is provided at the cylinder 17. A leading end of a printing sheet 22 is clamped by the unit 21 to mount the sheet 22 on an outer periphery of the cylinder 17. The cylinder 16 and the cylinder 17 are rotated, the end of the sheet 22 conveyed along the supplied sheet conveying direction is clamped by the unit 21, moved by a rotation of the cylinder 17, passed at substantially near outer peripheral positions of the cylinder 16 and the cylinder 17, and printed. A pair of plate cylinder side specifying guides 44, 44 are provided at near positions so as to be opposed to the near peripheral positions of the cylinder 16 and the cylinder 17, folding of the sheet 22 to the cylinder 17 side to the conveying direction of the sheet 22 is specified only at both ends of the sheet 22 to the conveying direction to be guided to a sheet conveying mechanism 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing paper fed from a paper feeding unit, in which the printing paper is passed through a rotating plate cylinder in a pressure-contact state to perform printing, and the printed printing paper is delivered by a paper delivery mechanism. Related to a printing device.

[0002]

2. Description of the Related Art A stencil printing apparatus, which is a kind of printing apparatus,
The heat-sensitive head heat-perforates the stencil sheet corresponding to the desired image, winds the heat-perforated stencil sheet around the outer circumference of the plate cylinder, and presses the printing paper from the paper feed unit so as to press against the wound stencil sheet. And prints an image by transferring the ink to the printing paper through the thermal perforation of the stencil sheet in the process of pressing and passing the printing paper. The printed printing paper is transferred by a paper transfer mechanism, and the transferred printing is performed. The sheet is transported to a predetermined position and discharged. In such a stencil printing apparatus, the printing paper goes through each processing step of paper feeding, printing, and paper discharging including paper delivery, and a conventional configuration for performing such paper processing will be described.

FIGS. 15 and 16 show a first conventional example of paper processing. 15 and 16, the printing unit 100
Has a plate cylinder 101 rotatably provided and a press roll 102 disposed below the plate cylinder 101. A stencil sheet (not shown) is provided on the plate cylinder 101 so as to be freely wound. The press roll 102 can move between a press contact position and a separation position with respect to the plate cylinder 101. A paper feed unit 103 is provided in a space on the left side of the plate cylinder 100 and the press roll 101, and a paper discharge unit 10 having a paper transfer mechanism 104 is provided in a space on the right side.
5 are arranged respectively. The paper feed unit 103 includes a scraper 107 that presses against the uppermost one of the stacked printing papers 106, a pickup roll 108 and a sabaki plate 109 that are located downstream of the scraper 107 during conveyance.
And the pickup roll 108 and the mackerel board 109
, A guide roll 110 and a timing roll 111 disposed downstream of the conveyance of the sheet. The guide roll 110 can move between a pressing position and a separated position with respect to the timing roll 111.

The paper discharge unit 105 includes a paper transfer mechanism 104 including a separation fan 112 and a separation claw 113, a conveyance belt 114, and a suction fan (not shown) for bringing the print paper discharged to the conveyance belt 114 into suction contact. ). The separation claw 113 is disposed at a position where it interferes with a substantially central portion of the printing paper 106 wound around the plate cylinder 101.

Next, a description will be given of a paper discharging operation including paper feeding, printing, and paper delivery in the above configuration.

As shown in FIG. 15A, while the plate cylinder 101 rotates, the scraper 107 and the pickup roll 108 rotate, and only one sheet of the printing paper 106 at the uppermost position is conveyed by the action of the sabaki plate 109. You. FIG.
As shown in (B), the leading end of the conveyed printing paper 106 comes into contact with the timing roll 111 and the guide roll 110 and is prevented from moving, and thereafter the rotation of the scraper 107 and the pickup roll 108 is stopped. It stops in a state where the printing paper 106 is bent. next,
As shown in FIG. 15C, the timing roll 111 and the guide roll 110 rotate, and the printing paper 106 is conveyed to a location on the outer peripheral surface near the plate cylinder 101 and the press roll 102. In this operation process, the scraper 107 and the pick-up roll 108 are idled so that the back tension is not applied to the printing paper 106.

When the printing paper 106 is conveyed to a location on the outer peripheral surface near the plate cylinder 101 and the press roll 102, as shown in FIG. 15D, the press roll 102 is shifted to the press contact position, and The printing paper 106 is sandwiched between the press roll 101 and the press roll 102, and printing is started. Further, at the time when the press roll 102 is shifted to the pressing position, the guide roll 110 is shifted to the separated position so that the back tension is not applied to the printing paper 106.

When the leading end side of the printing paper 106 passes through the outer circumferential surface of the press-contact between the plate cylinder 101 and the press roll 102, as shown in FIG. 106 is the plate cylinder 101
Peeled off from The printing paper 106 peeled off by the separation fan 112 and the separation claw 113 is conveyed to a conveyance belt 114 as shown in FIG. Conveyor belt 1
The printing paper 106 conveyed onto the sheet 14 is sent to a discharge tray (not shown) while being sucked by the conveyance belt 114 by the suction fan, and the printing operation of one sheet is completed.
Then, as shown in FIG.
8 moves to the pressure contact position and shifts to the next printing operation, and the above operation is performed for a predetermined number of printed sheets.

FIGS. 17 and 18 show a second conventional example of paper processing. 17 and 18, the printing unit 100
Has a plate cylinder 101 rotatably provided, and a paper cylinder 120 disposed below and having substantially the same diameter as the plate cylinder 101 also rotatably provided. A part of the outer peripheral surface is substantially close to each other. An intermediate press roll 121 is rotatably provided inside the plate cylinder 101, and a printing pressure is applied by the intermediate press roll 121. A stencil sheet (not shown) is provided on the outer peripheral surface of the plate cylinder 101 so as to be freely wound. The paper cylinder 120 is provided with a paper clamp 120a (shown in FIGS. 17C and 18A), and the print paper 106 can be freely wound around the leading end of the paper clamp 120a. Is provided.

A paper feed unit 103 is disposed in a space on the left side of the plate cylinder 100 and the paper cylinder 120, and a paper discharge unit 105 having a paper transfer mechanism 104 is disposed in a space on the right side. The paper feed unit 103 includes a scraper 107 that presses against the uppermost one of the stacked print papers 106, a pickup roll 108 and a sabaki plate 109 located downstream of the scraper 107, and a pickup roll 108 and a sabaki plate 109. , A guide roll 110 and a timing roll 111 disposed downstream of the conveyance of the sheet. The guide roll 110 can move between a pressing position and a separated position with respect to the timing roll 111.

The paper discharge unit 105 is disposed close to the paper cylinder 120 and has a paper discharge pinch roll 122 serving as a paper transfer mechanism 104 for guiding left and right ends of the print paper 106.
A guide plate 123 for guiding the leading end of the printing paper 106 guided by the paper discharge pinch roll 122,
It has a downstream pinch roll 124 and a paper discharge guide roll 125 located downstream of the conveyance of the guide plate 123, and a paper discharge jump roll 126 arranged further downstream of this.

Next, a description will be given of a paper discharging operation including paper feeding, printing, and paper delivery in the above configuration.

As shown in FIG. 17A, the plate cylinder 101 and the paper cylinder 120 are rotated, and the intermediate press roll 121 is also rotated.
While rotating in synchronism with 1, the scraper 107 and the pickup roll 108 rotate, and only one printing sheet 106 at the uppermost position is conveyed by the action of the sabaki plate 109. As shown in FIG. 17B, the leading end of the conveyed printing paper 106 comes into contact with the timing roll 111 and the guide roll 110 to be prevented from moving, and thereafter, the rotation of the scraper 107 and the pickup roll 108 is stopped. As a result, the printing paper 106 stops in a warped state.

Next, as shown in FIG. 17C, the timing roll 111 and the guide roll 110 rotate, and the printing paper 106 is conveyed toward the outer peripheral surface of the paper cylinder 120. In this operation process, the scraper 107 and the pick-up roll 108 are idled so that the back tension is not applied to the printing paper 106. FIG. 17 (C)
When the leading end of the printing paper 106 is conveyed to the outer peripheral surface of the paper cylinder 120 as shown in FIG.
20a clamps the leading end of the printing paper 120. FIG.
As shown in (A), the printing paper 106 which has been clamped is moved together by the rotation of the paper cylinder 120, and the printing pressure is applied to the intermediate press roll 121 when passing through the press-contact outer peripheral portion of the plate cylinder 101 and the press roll 102. Upon receipt, the image is printed. In this operation process, the guide roll 110 is located at the separated position so that the back tension is not applied to the printing paper 106.

When the leading end of the printing paper 106 passes through the paper discharge pinch roll 122, the paper clamping unit 120a is released from the clamp, and the leading end of the printing paper 106 is separated from the paper drum 120 by its own elastic return deformation. As shown in FIG. 18B, the printing paper 106 separated from the paper cylinder 120 is guided by a guide plate 123 and guided between a downstream pinch roll 124 and a paper discharge guide roll 125, and this downstream pinch is provided. Roll 124 and discharge guide roll 12
The rotation is continued by the rotation of No. 5 and further sent to a discharge tray (not shown) by the rotation of the discharge jump roll 126 further downstream, thereby completing the printing operation of one sheet. And FIG.
As shown in (C), the guide roll 108 shifts to the pressure contact position and shifts to the next printing operation, and the above operation is performed for a predetermined number of prints.

[0016]

By the way, in the first conventional example, the printing paper 106 is peeled off from the plate cylinder 101 by the blowing of the separation fan 112 in the printing in which the printing transfer area is not large (other than solid printing). The transfer of the printing paper 106 is performed by the
13 does not directly hit the printing paper 106. But,
In solid printing with a very large print transfer area, the printing paper 106 is not peeled off from the plate cylinder 101 only by the blowing of the separation fan 112 due to the high viscosity of the ink, and the separation claw 113 is attached to the printing paper 106.
However, there is a problem in that the print residue is left behind on the printing surface, resulting in poor printing.

In the second conventional example, the printing paper 1
06 is clamped by the paper clamp unit 120a, the left and right ends of the print paper 106 are supported by the pair of paper discharge pinch rolls 122, 122, and then the clamp is released, so that the print paper 106 is delivered. Even when the viscosity of the ink is high in the solid printing, the printing paper 106 can be delivered without causing a printing defect such as a nail residue. However, since the left and right ends of the printing paper 106 are supported by the pair of paper discharge pinch rolls 122, 122, printing cannot be performed on that portion, and as shown in FIG. Will have a large margin. That is, only printing with a low pixel area ratio to the area of the printing paper 106 can be performed.

A pair of paper discharge pinch rolls 122, 12
2 is a rotating body that takes up a certain amount of space, so that it cannot be arranged at a position close to the substantially outer peripheral surface of the plate cylinder 101 and the paper cylinder 120, and must be arranged at a distant position. . Accordingly, the clamp is released for the first time at a position distant from the substantially outer peripheral surface of the plate cylinder 101 and the paper cylinder 120, and is transferred to the pair of paper discharge pinch rolls 122, 122. The printing paper 106 is conveyed while being bent along the paper cylinder 120 to the position. Such a bent conveyance is not so problematic as long as the printing paper 106 has a weak stiffness, but a printing paper 106 having a strong stiffness (for example, thick paper, postcard) has a serious problem of damage to the printing paper 106.

Therefore, the present invention has been made to solve the above-mentioned problems, and does not cause printing defects such as nail flaws on a stiff printing paper and damage printing having a high pixel area ratio. It is an object of the present invention to provide a printing apparatus capable of delivering a printing sheet without giving a print.

[0020]

According to a first aspect of the present invention, a plate cylinder and a paper cylinder are rotatably provided with a part of their outer peripheral surfaces substantially close to each other, and a plate base paper is placed on the outer peripheral surface of the plate cylinder. The paper cylinder is provided with a paper clamp section, the leading end of the paper cylinder is clamped by the paper clamp section, and printing paper is provided so as to be freely mountable on the outer peripheral surface of the paper cylinder. The near-periphery outer surface is rotated so as to move in the same direction, and the leading end of the printing paper conveyed from the paper supply unit along a predetermined paper supply conveyance direction is clamped by the paper clamp unit. The printing paper is moved by the rotation of the press cylinder, so that a substantially proximate outer peripheral surface portion between the plate cylinder and the press cylinder is passed through the plate base paper in a pressure-contact state. Printed after the transfer In a printing apparatus configured to perform delivery of the printing paper that has passed through a substantially adjacent outer peripheral surface portion between the plate cylinder and the paper cylinder by a paper delivery mechanism, the paper delivery mechanism includes: The print paper is disposed at a close position so as to face a substantially adjacent outer peripheral surface portion, and only the both ends of the print paper are restricted such that the print paper bends by a predetermined amount or more toward the plate cylinder side with respect to the paper feed direction. It is characterized by having a pair of left and right plate cylinder side regulating guides for guiding in the sheet discharge and conveyance direction.

In this printing apparatus, the plate cylinder-side regulating guide is a mere guide member having no rotating portion, and is arranged at a position close to the plate cylinder and the paper cylinder in such a manner as to face substantially the outer peripheral surface of each other. Therefore, even if the paper clamp is released immediately after the leading edge of the printing paper has passed through the approximate proximity of the outer peripheral surface between the plate cylinder and the paper cylinder, the leading edge of the printing paper remains at the pair of left and right plate cylinder side regulating guides. It is guided in the sheet discharging and conveying direction while being regulated, the printing paper does not bend more than a predetermined amount in the sheet feeding and conveying direction, and the plate cylinder side regulating guide is a simple guide member having no rotating portion, The contact area with both ends of the printing paper can be set sufficiently small.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the paper delivery mechanism is disposed at a position close to an outer peripheral surface of the plate cylinder and the paper cylinder substantially adjacent to each other. The printing apparatus further includes a paper cylinder-side regulating guide section that regulates bending of the printing paper toward the paper cylinder side by a predetermined amount or more with respect to the paper feeding and transporting direction and guides the paper sheet in the paper discharging and conveying direction.

In this printing apparatus, in addition to the operation of the first aspect of the present invention, when the printing paper is conveyed while being bent to the paper cylinder side for some reason, the printing paper is controlled by the paper cylinder side regulating guide. The sheet is guided in the sheet discharging and conveying direction while being regulated by the sheet feeding section.

According to a third aspect of the present invention, in the printing apparatus according to the first aspect, a pair of horizontal guide surfaces capable of contacting both ends of the printing paper with the pair of plate cylinder side regulating guides,
A tapered guide surface is provided inside the pair of horizontal guide surfaces so as to gradually increase the amount of bending toward the plate cylinder toward the center.

In this printing apparatus, in addition to the effect of the first aspect of the invention, when the printing paper is pulled toward the plate cylinder due to the viscosity of the ink, the printing paper bent by the pulling force is transferred to the pair of plate cylinders. The restriction can be performed by the taper guide surface inside each of the horizontal guide surfaces of the side restriction guide portion.

[0026]

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

1 to 14 show an embodiment of the present invention, and FIG. 1 is an overall schematic configuration diagram of a stencil printing apparatus.

In FIG. 1, a stencil printing apparatus 1 mainly includes a document reading unit (not shown), a stencil making unit 3, a printing unit 4, a paper feeding unit 5, a paper discharging unit 6, and a stencil discharging unit 7. Is configured.

The document reading section reads a document as an electric signal. This read information is a predetermined command (enlargement, reduction, etc.)
It is configured to be able to process based on.

The stencil making section 3 is a stencil accommodation section 11 for accommodating a long stencil sheet 10 wound in a roll shape, which is a stencil sheet.
A guide feed roller 9 disposed downstream of the stencil sheet 10 in the conveying direction with respect to the stencil storage section 11, a thermal head 12 disposed downstream of the guide feed roller 9 in the conveying direction,
A platen roller 13 disposed at a position facing the thermal head 12 and rotated by a driving force of a write pulse motor (not shown). The plate making section 3 has a platen roller 13 and a pair of base paper feed rollers 14 and 14 disposed between the thermal head 12 and a plate cylinder 16 to be described later. It is rotated in synchronization with the platen roller 13 by the driving force of the motor. Further, the plate making section 3 includes a pair of base paper feed rollers 14 and 1.
4 and a stencil cutter (not shown) arranged between the platen roller 13 and the thermal head 12, and the stencil sheet 10 is cut by the stencil cutter.

The printing section 4 has a plate cylinder 16 and a paper cylinder 17 having substantially the same diameter, and a part of the outer peripheral surface thereof is arranged in a state of being substantially close to each other. The plate cylinder 16 and the paper cylinder 17 are configured to be able to rotate in synchronization with the directions of arrows in FIGS. 1 and 3. The plate cylinder 16 has a pair of cylindrical flanges (not shown) provided facing each other at a predetermined interval, and a base paper clamp portion 18 is provided on a part of the outer peripheral surface of the flange. The stencil paper clamp 10 can clamp the leading end of the stencil paper 10. A flexible screen 19 that forms the peripheral wall of the plate cylinder 16 is stretched on the outer peripheral surfaces of the pair of flanges of the plate cylinder 16 other than the base paper clamp unit 18. The screen 19 is configured to allow ink to pass through at least in the printing area when a printing pressure is applied. An intermediate press roll 20 is provided inside the screen 19 of the plate cylinder 16, and the intermediate press roll 20 presses the screen 19 toward the outer peripheral side (the state shown in FIG. 1) and the screen 19.
It shifts between the standby position where it retreats more inward. Also, the ink is supplied to the outer peripheral surface of the intermediate pressing roll 20. That is, the intermediate press roll 20 applies printing pressure from the inner peripheral surface side of the screen 19 and supplies ink from the inner peripheral surface of the screen 19.

A paper clamp 21 is provided at a predetermined position on the outer peripheral surface of the paper cylinder 17, and the leading end of the printing paper 22 can be clamped by the paper clamp 21.

The paper supply unit 5 includes a paper supply table 23 on which print papers 22 are stacked, and a print paper 2 at the uppermost position from the paper supply table 23.
2, a pickup roll 25 and a sabaki roll 26 that are arranged downstream of the scraper 24 and that are positioned substantially in proximity to each other, and a scraper 24 that is arranged downstream of the pickup roll 25 and sabaki roll 26 and A guide roll 27 and a timing roll 28 which are positioned in a substantially close state; a stop finger 29 which can regulate the leading end of the printing paper 22 at the position of the timing roll 28; a position of the pickup roll 25 and the sabaki roll 26; A sheet detection sensor 30 that detects a position between the sheet and the position of the roll 28. The guide roll 27 can move between a pressing position where the guide roll 27 is pressed against the timing roll 28 and a separation position where the guide roll 27 is separated from the timing roll 28. The paper detection sensor 30 includes a light emitting element 30a and a light receiving element 30b, and detects the leading end of the conveyed printing paper 22.

The printing paper 22 moved by the rotation of the scraper 24 is allowed to be conveyed only by the pickup roll 25 and the sabaki roll 26 to the printing paper 22 at the uppermost position.
The paper is conveyed in synchronization with the rotation of the paper cylinder 17 by the rotation of the guide roll 27 and the timing roll 28.

The paper discharge section 6 includes a paper delivery mechanism 31 disposed at a position close to the outer peripheral surface of the plate cylinder 16 and the paper cylinder 17 substantially in proximity to each other, and a print delivered by the paper delivery mechanism 31. Paper transport mechanism 3 for transporting paper 22
2 and a stacker section 33 on which the printing paper 22 transported by the paper transport mechanism 32 is placed in a stacked state.

The plate discharging section 7 is a base paper clamping section 1 of the plate cylinder 16.
8, a windmill-shaped member 35 for guiding the leading end of the stencil 10 released, and a guide belt 36 for transmitting a rotational force to the windmill-shaped member 35 and assisting the conveyance of the stencil 10.
And a pair of upper and lower stencil conveyance belts 37, 37 for conveying the stencil sheet 10 conveyed by the windmill-like member 35 and the guide belt 36 to the stencil discharge box 38, and the stencil sheet 10 conveyed by the respective stencil conveyance belts 37. The stencil box 38 to be stored, and the stencil sheet 10
And a plate discharge compression member 39 which is pushed into the back of the plate 8.

Next, the paper transfer mechanism 31 and the paper transport mechanism 32 will be described.

FIG. 2 is a perspective view of a paper discharge unit of the paper delivery mechanism 31 and the paper transport mechanism 32, FIG. 3 is a schematic side view of the paper discharge unit, and FIGS. 4A and 4B are a pair of plate cylinders, respectively. FIGS. 5 (A) and 5 (B) are enlarged views of main parts of the side regulation guide portion, FIG. 6 is a configuration diagram of the paper transport mechanism 32 as viewed from the front side, and FIGS. 7 (A) and 7 (B). FIG.

2 to 7, the paper discharging unit A is
It has a pair of left and right side plates 40, 40 arranged at intervals, and the pair of side plates 40, 40 is provided with a plurality of support rods 41.
Are connected by The plurality of support rods 41 support a pair of left and right upper guide block members 42, 42. The pair of upper guide block members 42, 42 are respectively guided by the support rod 41 and movably provided in the left-right direction. I have. That is, a pair of upper guide block members 4
2 and 42 are configured so that the distance between them can be freely adjusted, whereby the widths of the paper transfer mechanism 31 and the paper transport mechanism 32 themselves can be adjusted according to the width of the printing paper 22 to be used. ing.

The paper transfer mechanism 31 has an upper protruding portion 43 protruding from the pair of upper guide block members 42, 42 toward the plate cylinder 16. The pair of upper protruding portions 43, 43 A pair of left and right plate cylinder side regulating guides 44, 44 for regulating only the both ends of the printing paper 22 to bend toward the plate cylinder 16 in the sheet feeding direction and guiding to the sheet conveying mechanism 32 are provided. I have. The pair of left and right plate cylinder side regulating guides 44, 44 are arranged at positions close to each other so as to face the substantially adjacent outer peripheral surface of the plate cylinder 16 and the paper cylinder 17. The sheet delivery mechanism 31 has a lower block member 45 provided below the upper protruding portion 43 of the pair of upper guide block members 42, 42, and the lower block member 45 feeds the printing paper 22. A paper cylinder-side regulating guide portion 4 that regulates the bending to the paper cylinder 17 side by a predetermined amount or more with respect to the transport direction and guides the paper to the paper transport mechanism 32.
6 are provided. The paper cylinder side regulating guide part 46 is arranged at a position close to the substantially outer peripheral surface of the plate cylinder 16 and the paper cylinder 17.

More specifically, as shown in FIGS. 4 and 5, the pair of left and right plate cylinder side regulating guides 44,
2 is a pair of horizontal guide surfaces 44a,
4a, and a tapered guide surface 44b in the inside of each of the pair of horizontal guide surfaces 44a, 44a, in which the amount of bending toward the plate cylinder 16 (upper side) gradually increases toward the center. The paper cylinder side regulating guide portion 46 includes:
As shown in FIG. 2, the paper cylinder side protrudes at intervals, and the upper surface of the paper cylinder side regulating guide portion 46 is configured as a linear tapered surface 46a that gradually rises upward from the paper cylinder side toward the paper transport mechanism 32 side. ing.

The paper transport mechanism 32 includes a pair of left and right side plates 4.
And a lower discharge roller 47 rotatably supported at 0, 40. The lower discharge roller 47 is spaced apart from the lower discharge roller 47 in the paper discharge direction.
It is located in several places. These two lower discharge rollers 47
Is a driving belt 48 driven by a driving force of a motor (not shown).
Are rotated synchronously in the same rotation direction. Roll support members 49 are respectively disposed inside the pair of left and right upper guide block members 42, 42, and each of the roll support members 49 is provided with a paper discharge upper roll 50 at two places at intervals in the paper discharge direction. It is provided rotatably.

A compression spring 51 (shown in FIGS. 3 and 6) is provided between the upper guide block member 42 and the roll support member 49.
The compression spring 51 causes the upper discharge roll 5
0 is urged in the pressing direction of the lower discharge roller 47. When the lower discharge roller 47 is driven to rotate, the upper discharge roller 50 is rotated following the rotation force. still,
In FIG. 2, reference numeral 52 denotes a transport lower guide, and reference numeral 53 denotes a transport upper guide.

Next, the operation of the stencil printing machine 1 will be briefly described. In the stencil making section 3, the stencil sheet 10 is conveyed by the rotation of the platen roller 13 and the stencil feed roller 14, and a large number of heating elements of the thermal head 12 selectively generate heat based on image information read by the document reading section. The stencil sheet 10 is thermally pierced, and a portion corresponding to one plate length of the stencil sheet 10 having been made is cut with a stencil cutter to produce a stencil sheet 10 having a desired size.

In the printing section 4, the leading end of the stencil sheet 10 produced by the stencil making section 3 is clamped by the stencil clamping section 18 of the plate cylinder 16, and in this clamped state, the plate cylinder 16 is rotated to convert the stencil sheet 10 to the stencil sheet. It is wrapped around the outer peripheral surface of the screen 19 of the body 16 to form a plate.

The paper supply section 5 conveys the printing paper 22 in synchronization with the rotation of the plate cylinder 16 and the paper cylinder 17, and clamps the leading end of the printing paper 22 by the paper clamping section 21 of the paper cylinder 17. And between the paper cylinder 17.

On the other hand, the printing unit 4 rotates the plate cylinder 16 by positioning the middle pressing roll 20 at the pressing position during printing. Then, the intermediate press roll 20 rotates on the inner peripheral surface of the screen 19 while pressing the inner peripheral side of the screen 19. Since ink is constantly supplied to the outer peripheral surface of the intermediate press roll 20, the ink is transferred to the screen 19 by this rotation. In addition, the screen 19 bulges to the outer peripheral side by the pressing of the middle press roll 20, and is brought into pressure contact with the paper cylinder 17. The printing paper 22 conveyed from the paper supply unit 5 as described above is conveyed while being pressed against the stencil sheet 10 by the intermediate press roll 20, and an image is printed on the printing paper 22 in the pressing and conveying process. The leading edge of the printing paper 22 is the middle press roll 2
When the sheet passes through the position No. 0 and reaches downstream, the paper clamp 2
1 is released.

In the paper discharge section 6, the printing paper 22 is received and delivered by the paper delivery mechanism 31 on the downstream side of the printing portion, and the delivered printing paper 22 is transferred to the paper transport mechanism 32.
And discharged to the stacker unit 33.

Further, in the plate discharging section 7, when starting a new plate making operation, it is necessary to discharge the used stencil sheet 10 used for the previous printing which is wound around the outer peripheral surface of the screen 19 of the plate cylinder 16 and mounted. In this case, the stencil clamp 18 of the plate cylinder 16 is released at a stage before a new stencil sheet having a stencil formed on the outer peripheral surface of the peripheral wall of the plate cylinder 16 is released. The leading end is guided by a windmill-like member 35 while rotating the plate cylinder 16, and housed in a plate discharge box 38 via a pair of plate discharge belts 37.

Next, detailed operations of paper ejection including paper feeding, printing, and delivery will be described with reference to FIGS.

As shown in FIG. 8, the plate cylinder 16 and the paper cylinder 17
Rotates, and the intermediate press roll 20 also rotates in synchronization with the plate cylinder 16, while the scraper 24 and the pickup roll 2
5 is rotated, and only one sheet of the printing paper 22 at the uppermost position is conveyed by the action of a pressurizing plate (not shown) and a cleaning roll 26. When the leading end of the transported printing paper 22 reaches the detection position of the paper detection sensor 30, the paper detection sensor 30
Is detected, and the rotation of the scraper 24 and the pickup roll 25 is stopped at a point when the sheet is conveyed by a predetermined distance from the point of detection. Then, as shown in FIG.
2 is stopped in a state where the tip of the second abuts on the stop finger 29.

Next, the guide roll 27 is moved from the separated position to the pressure contact position, the guide roll 27 sandwiches the printing paper 22 with the timing roll 28, and the stop finger 29 is moved to the standby position. And FIG.
As shown at 0, the guide roll 27 and the timing roll 28 rotate, and the printing paper 22 is transported toward the outer peripheral surface of the paper cylinder 17 along a predetermined paper transport direction. In this operation process, the scraper 24 and the pickup roll 25 are idled so that the back tension is not applied to the printing paper 22.

When the leading edge of the printing paper 22 is conveyed to the outer peripheral surface of the paper cylinder 17, the paper clamping unit 21 of the paper cylinder 17 clamps the leading edge of the printing paper 22. As shown in FIG. 11, the clamped printing paper 22 is moved together by the rotation of the paper cylinder 17, and applies a printing pressure to the intermediate press roll 20 when passing through the press-contact outer peripheral portion of the plate cylinder 16 and the paper cylinder 17. Ink is transferred from the perforated portion of the stencil sheet 10 to print an image. In this operation process, the guide roll 27 is located at the separated position so that the back tension is not applied to the printing paper 22.

As soon as the leading end of the printing paper 22 has passed the position of the intermediate press roll 20, that is, the printing location, the paper clamp unit 21 is released as shown in FIGS.
Then, the leading end side of the printing paper 22 becomes straight due to its own elastic return deformation and the like, and the bending toward the plate cylinder 16 side is regulated by the plate cylinder side regulating guide portion 44, and is conveyed while being guided by the sheet conveying mechanism 32. Is done. If, for some reason, the printing paper 22 is not straight and is conveyed while being bent toward the paper cylinder 17, the paper cylinder-side regulating guide 46
The sheet is guided to the sheet transport mechanism 32 side while the bending is regulated by the sheet. The printing paper 22 guided in this manner is, as shown in FIGS.
7 and the discharge upper roll 50, and continues to move by the rotation of the discharge lower roll 47 and the discharge upper roll 50,
This is sent to the stacker unit 33, and the printing operation for one sheet is completed. Then, the guide roll 27 moves to the pressure contact position and shifts to the next printing operation, and the above operation is performed for a predetermined number of printed sheets.

As described above, a pair of left and right plate cylinder side regulating guide portions 4 are provided.
4 and 44 are mere guide members having no rotating portion, so that they do not take a large space, and are arranged at positions close to the plate cylinder 16 and the paper cylinder 17 so as to face substantially adjacent outer peripheral portions. As shown in FIG. 3,
Immediately after the leading end of the printing paper 22 has passed the printing position, the paper clamp 21 is released to release the pair of plate cylinder side regulating guides 44,
44. Therefore, the printing paper 22 is transferred to the cylinder 1
Since the printing paper 22 is hardly bent along the printing paper 7, the printing paper 22 can be delivered without damaging the stiff printing paper (for example, thick paper, postcard) 22 by bending.

In the first and second prior art paper feeding processes, the leading end of the printing paper 106 is brought into contact with the timing roll 111 and the guide roll 110 to bend the printing paper 106 to set the position. The strong print paper 22 is damaged by bending, and the strong print paper 22 cannot be used. However, in the paper feeding process of the above embodiment, the print paper 22 is stopped at the position where the leading end of the print paper 22 contacts the stop finger 29 by the detection output of the paper detection sensor 30, so that the position of the print paper 22 can be set almost without bending. Therefore, the stiff printing paper 22 is not damaged by bending in the paper supply unit 5. As described above, it is possible to realize an apparatus that does not damage the stiff printing paper 22 by bending as a whole of the printing apparatus.

A pair of left and right plate cylinder side regulating guides 44,
Reference numeral 44 denotes a mere guide member having no rotating portion, and the contact area with the printing paper 22 can be set sufficiently small. Therefore, as shown in FIGS. Since both ends are merely brought into contact with the horizontal guide surface 44a, no printing failure such as a nail flaw occurs on the printing paper 22 and, as shown in FIG. Printing with high quality.

As shown in FIG. 7A, the upper discharge roll 50 of the paper transport mechanism 32 has a truncated conical shape and the outer peripheral surface 50a has a small width. There is no rotational movement except for. Therefore, printing with a small pixel area ratio with a small margin can be realized as the entire printing apparatus. Also, as shown in FIG. 7B, for some reason, the end of the printing paper 22 is placed on the outer peripheral surface 5 of the upper discharge roll 50.
0a and comes into contact with the conical surface 50b, the frictional force and centrifugal force from the conical surface 50b cause the outer peripheral surface 50a.
Since the external force that returns to the position described above is applied, the sheet is reliably transported without causing jamming.

Further, according to the above embodiment, after the clamp is eliminated, the printing paper 22 is moved by the printing cylinder 22 due to the viscosity of the ink.
When the printing paper 22 is pulled toward the sixth side, the printing paper 22 bends due to this tensile force, and both ends of the printing paper 22 are disengaged from the horizontal guide surfaces 44a of the pair of plate cylinder side regulating guides 44, 44. As shown in FIGS. 4 (B) and 5 (B), the printing paper 22 can be reliably guided to the paper transport mechanism 32 because it is regulated and guided by the tapered guide surface 44b.

According to the above-described embodiment, even after the clamp of the paper clamp unit 21 is released, the leading end side of the printing paper 22 is transported while being bent toward the paper cylinder 17 without being in a straight line for some reason. In this case, since the folding is regulated by the paper cylinder side regulating guide portion 46 and guided to the paper transport mechanism 32 side, the printing paper 22 can be surely guided to the paper transport mechanism 32 side.

In the above-described embodiment, the pair of plate cylinder side regulating guide portions 44, 44 regulates the printing paper 22 so as not to bend almost toward the plate cylinder 16 with respect to the sheet feeding direction. , The plate cylinder 16 based on the paper feed direction.
Any material can be used as long as it restricts bending to the side by a predetermined amount or more. However, with the configuration as in the above embodiment, the bending of the printing paper 22 can be reduced as much as possible.

In the above embodiment, the paper transport mechanism 32
Is configured by arranging the lower discharge roller 47 and the upper discharge roller 50 at two locations upstream and downstream, respectively, but it may be provided at one location, and also includes a transport belt and a suction fan as in the conventional example. You may. That is, any material can be used as long as it can transport the printing paper 22 to the stacker unit 34. Further, if the sheet is immediately discharged from the sheet delivery mechanism 31, the paper transport mechanism 32 is not required.

In the above-described embodiment, the case where the present invention is applied to the paper output unit 6 of the stencil printing apparatus 1 has been described. It can be applied in almost the same manner as long as it is a device that is delivered via the Internet.

[0064]

As described above, according to the first aspect of the present invention, the sheet delivery mechanism is disposed at a close position so as to face substantially the outer peripheral surface of the plate cylinder and the paper cylinder. Since there is a pair of left and right plate cylinder side regulating guides that restrict only the both ends of the printing paper to bend toward the plate cylinder side by a predetermined amount or more with respect to the sheet feeding direction and guide the sheet in the sheet discharging direction, The plate cylinder side regulating guide portion is a mere guide member having no rotating portion, and can be arranged in a close position so as to face a substantially outer peripheral surface of the plate cylinder and the press drum. Even if the paper clamp is released immediately after passing through the substantially adjacent outer peripheral surface portion between the plate cylinder and the paper cylinder, the leading end of the printing paper is restricted by the pair of left and right plate cylinder side regulating guides while in the discharge direction. Is guided and the printing paper is It is not bent, and the plate cylinder side regulating guide is a mere guide member having no rotating portion.Since the contact area with both ends of the printing paper can be set sufficiently small, the printing paper with strong stiffness can be used. The printing paper can be delivered without causing printing defects such as nail flaws and damaging printing with a high pixel area ratio.

According to the second aspect of the present invention, the paper delivery mechanism is disposed at a position close to the substantially outer peripheral surface of the plate cylinder and the paper cylinder, and the paper delivery mechanism is based on the paper feeding and conveying direction of the printing paper. Since the paper cylinder side regulating guide portion which regulates bending at a cylinder side by a predetermined amount or more and guides the paper in the paper discharge conveyance direction is provided, in addition to the effect of the invention of claim 1, the printing paper is When the paper is conveyed while being bent to the drum side, the printing paper is guided in the paper discharging and conveying direction while being regulated by the paper drum side regulating guide portion, so that the printing paper is surely guided in the paper discharging and conveying direction. Can be.

According to the third aspect of the present invention, the pair of plate cylinder side regulating guides has a pair of horizontal guide surfaces to which both ends of the printing paper can come into contact, and a center inside the pair of horizontal guide surfaces. The tapered guide surface is provided so as to gradually increase the amount of bending toward the plate cylinder toward the plate cylinder. Therefore, in addition to the effect of the invention of claim 1, the printing paper is moved toward the plate cylinder by the viscosity of the ink. When the printing paper is pulled, the printing paper bent by the pulling force can be regulated by the tapered guide surfaces inside each of the horizontal guide surfaces of the pair of plate cylinder side regulating guides, so that the printing paper is reliably discharged. It can be guided in the paper transport direction.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a schematic configuration diagram of an entire stencil printing apparatus.

FIG. 2 is a perspective view of a sheet discharging unit of a sheet discharging unit according to the embodiment of the present invention.

FIG. 3 is a schematic side view of a sheet discharging unit of a sheet discharging unit according to the embodiment of the present invention.

FIG. 4 shows an embodiment of the present invention, wherein (A) and (B)
FIG. 3 is a front view of a pair of plate cylinder side regulating guide portions.

FIGS. 5A and 5B show one embodiment of the present invention.
3 is an enlarged front view of a main part of a pair of plate cylinder side regulating guides.

FIG. 6 is a configuration diagram illustrating an embodiment of the present invention, as viewed from the front side of a paper transport mechanism.

FIG. 7 shows an embodiment of the present invention, wherein (A) and (B)
3 is an enlarged configuration diagram of a main part of the sheet transport mechanism.

FIG. 8 is a schematic view illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 9 is a schematic diagram illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 10 is a schematic diagram illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 11 is a schematic diagram illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 12 is a schematic diagram illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 13 is a schematic diagram illustrating an embodiment of the present invention and illustrating a sheet discharging operation including sheet feeding, printing, and delivery.

FIG. 14 is a plan view of a printing sheet showing a margin range according to the embodiment of the present invention.

FIGS. 15 (A) to (D) are schematic diagrams for explaining sheet discharging operations including sheet feeding, printing and delivery in the first conventional example.

FIGS. 16A to 16C are schematic diagrams for explaining sheet discharging operations including sheet feeding, printing, and delivery in the first conventional example.

FIGS. 17A to 17C are schematic diagrams for explaining sheet discharging operations including sheet feeding, printing, and delivery in the second conventional example.

FIGS. 18A to 18C are schematic diagrams for explaining sheet discharging operations including sheet feeding, printing, and delivery in the second conventional example.

FIG. 19 is a plan view of printing paper showing a margin range in a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus (printing apparatus) 10 Stencil base paper (plate base paper) 16 Plate cylinder 17 Paper cylinder 21 Paper clamp part 22 Printing paper 31 Paper delivery mechanism 32 Paper transport mechanism 44 Plate cylinder side regulation guide part 44a Horizontal guide surface 44b Taper guide Surface 46 paper cylinder side regulation guide

Claims (3)

[Claims] 1. A plate cylinder and a paper cylinder are respectively provided rotatably so that a part of the outer peripheral surface thereof is substantially close to each other, a plate base paper is provided so as to be freely mounted on the outer peripheral surface of the plate cylinder, and a paper clamp is provided on the paper cylinder. The printing paper is mounted on the outer peripheral surface of the paper cylinder so as to be freely mounted by clamping the leading end of the paper cylinder, and the plate cylinder and the paper cylinder are moved in the same direction at substantially the outer peripheral surface portions of each other. And the leading edge of the printing paper conveyed from the paper feeding unit along a predetermined paper feeding / conveying direction is clamped by the paper clamp unit, and the clamped printing paper is rotated by rotation of the paper cylinder. By moving the plate cylinder and the paper cylinder, a portion near the outer peripheral surface of the plate cylinder is passed through the plate base paper in a pressure-contact state, and in this passing process, ink is transferred from the plate base paper to perform printing. And the outer peripheral surface of the paper cylinder substantially close to the cylinder In a printing apparatus in which the delivery of the printing paper that has passed through a place is performed by a paper delivery mechanism, the paper delivery mechanism is located at a close position so as to face a location of the plate cylinder and the paper cylinder substantially close to each other on an outer peripheral surface. Placed,
A pair of left and right plate cylinder side regulating guides that regulates only both end portions of the print sheet and guides the print sheet to bend by a predetermined amount or more toward the plate cylinder side with respect to the sheet feeding and conveyance direction and guides the sheet in the sheet discharge conveyance direction. A printing apparatus comprising: a printing unit; 2. The printing apparatus according to claim 1, wherein the paper transfer mechanism is disposed at a position close to an outer peripheral surface of the plate cylinder and the paper cylinder substantially adjacent to each other. A printing apparatus, comprising: a paper cylinder-side regulating guide section that regulates bending of the paper cylinder side by a predetermined amount or more with respect to a transport direction and guides the paper cylinder in a paper discharge transport direction. 3. The printing apparatus according to claim 1, wherein a pair of horizontal guide surfaces that allow both ends of the printing paper to contact the pair of plate cylinder side regulating guide portions, and a pair of the horizontal guide surfaces. A printing apparatus, wherein a taper guide surface is provided on an inner side in a direction in which the amount of bending toward the plate cylinder gradually increases toward the center.