JP2001213039A - Stencil printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging with an ink generated by leaving a perforated stencil base paper set on a plate cylinder for a long time. SOLUTION: A stencil base paper perforated based on image information is wound and set on the plate cylinder, and the base paper is moved while a transfer cylinder is brought into contact with the revolving plate cylinder, and the ink run out of the perforations on the stencil base paper is transferred onto the transfer cylinder of the stencil printer in the moving process, and in the case the final printing operation is not the confidential processing, the stencil base paper set on the plate cylinder is removed when the given set time is passed after the point of completion of the final printing, and the automatic confidential processing operation for winding an unperforated stencil base paper on the plate cylinder is carried out, while in the case the power source is cut off by the given setting time after the point of completion of the final printing operation, a warning for demanding the execution of the confidential process is issued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine which winds a stencil sheet perforated on the basis of image information around a plate cylinder, mounts the stencil sheet, and performs printing using the stencil sheet thus mounted.

[0002]

2. Description of the Related Art A stencil printing apparatus heat-perforates a stencil sheet based on desired image information, winds and mounts the heat-perforated stencil sheet on a printing drum, and presses a printing paper against the rotating printing drum. To transfer the ink image directly to the printing paper, or to rotate while pressing the transfer cylinder against the rotating plate cylinder, to transfer the ink image to the transfer cylinder once, and to the rotating transfer cylinder. This is to transfer the ink image to the printing paper by moving the printing paper while pressing it.

[0003] In order to prepare for a plurality of printing operations, the stencil sheet mounted on the plate cylinder is generally removed from the plate cylinder only when the next new plate making operation is started (plate discharging operation).

[0004]

However, since the perforated stencil sheet is perforated by perforation, if the stencil sheet is left on the plate cylinder for a long period of time, the stencil sheet is exposed from the perforations of the stencil sheet. Since the ink in the cylinder comes into contact with the outside air, the water in the ink component in that portion evaporates and the viscosity of the ink increases, and when the amount of water in the ink component is large, it solidifies and causes clogging. . As a result, in the subsequent printing, the number of sheets to be started increases, and problems such as an increase in preparation time before printing, an increase in labor load, waste of printing materials, a decrease in production efficiency, and an increase in settlement costs arise.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is possible to prevent ink clogging caused by leaving a perforated stencil sheet mounted on a plate cylinder for a long time as much as possible. It is an object of the present invention to provide a stencil printing apparatus that can perform the printing.

[0006]

According to a first aspect of the present invention, a stencil sheet perforated on the basis of image information is wrapped around a plate cylinder, and the ink oozing from the perforation of the stencil sheet is directly or transferred. In a stencil printing apparatus that transfers a stencil sheet to a printing medium via a member, when a predetermined set time has elapsed from the end of the final printing operation, the stencil sheet attached to the plate cylinder is removed, and the stencil sheet without perforation is removed. An automatic confidential plate-making operation of winding around the plate cylinder is performed.

In this stencil printing apparatus, after a predetermined set time has elapsed from the end of the final printing operation, the ink in the plate cylinder is prevented from coming into contact with the outside air through the holes in the stencil paper by the non-perforated stencil paper. You.

According to a second aspect of the present invention, there is provided a stencil printing machine according to the first aspect, wherein the automatic stencil making operation is a stencil making operation in which a final printing operation is completed by mounting a non-perforated stencil sheet on a plate cylinder. It is not performed in such a case, but is performed when the final printing operation is not confidential platemaking.

In this stencil printing apparatus, in addition to the operation of the first aspect of the present invention, automatic confidential stencil making is not performed when a non-perforated stencil sheet is mounted on the plate cylinder. Can be avoided.

[0010] The invention of claim 3 is claim 1 or claim 2.
The stencil printing apparatus according to the above, wherein if a main power supply is turned off before a predetermined set time has elapsed from the end of the final printing operation, a warning is issued to prompt the user to perform confidential stencil making. And

In the stencil printing apparatus, in addition to the effects of the first or second aspect of the present invention, the user can be alerted by a warning.

According to a fourth aspect of the present invention, there is provided the stencil printing apparatus according to any one of the first to third aspects, wherein the set time from the end of the final printing operation to the execution of the automatic stencil making operation can be arbitrarily set. Features.

In the stencil printing apparatus, in addition to the effects of the first to third aspects of the present invention, the set time can be set or changed appropriately in accordance with the characteristics of the ink, the environment in which the apparatus is installed, and the like.

[0014]

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

1 to 5 show one embodiment of the present invention.
1 is a schematic configuration diagram of a stencil printing apparatus, FIG. 2 is a front view of an operation panel, FIG. 3 is a schematic circuit block diagram of the stencil printing apparatus, FIG. 4 is a flowchart of automatic confidential printing, and FIG. is there.

As shown in FIG. 1, a stencil printing apparatus 1 includes a stencil making mechanism 2, a printing mechanism 3, a paper feeding mechanism 4, and a paper discharging mechanism 5.
And a plate discharging mechanism 6.

The stencil making mechanism 2 includes a stencil container 10 for accommodating a long stencil sheet 11 wound in a roll shape, a thermal head 12 disposed downstream of the stencil container 10 and a pressure-sensitive head. A platen roller 13 disposed so as to be
A stencil cutter 14 arranged downstream of the thermal head 12 and the platen roller 13, and a pair of stencil feed rollers 15, 16 arranged downstream of the stencil cutter 14.
And

That is, the stencil sheet 11 is conveyed by the rotation of the platen roller 13 and the like, and each point heating element of the thermal head 12 selectively generates heat based on image information read by, for example, a document reading section (not shown). Then, the stencil sheet 11 is thermally pierced, and the rear side of the stencil sheet 11 conveyed is cut by the stencil cutter 14 to produce the stencil sheet 11 having a predetermined length. The stencil sheet 11 having a predetermined length is wound around an outer peripheral surface of a plate cylinder 17 described below.

The printing mechanism 3 is provided rotatably and has a plate cylinder 17, a transfer cylinder 18, and an impression cylinder 1 having substantially the same diameter.
9, a plate cylinder 17, a transfer cylinder 18, and an impression cylinder 19
As shown by arrows in FIG. 1, are rotated in the same direction and at the same circumferential speed at the places where they are close to and pressed against each other.

The plate cylinder 17 is rotatably supported by the apparatus main body 20 about a plate cylinder shaft 17a. A screen 22 which is swellable on the outer periphery of the plate cylinder 17 and which can pass through the ink 21 is provided. Is stretched. A squeegee roller 23 is disposed in the internal space of the plate cylinder 17. The squeegee roller 23 presses the screen 22 from the inner surface and a standby position where the squeegee roller 23 is separated from the inner surface of the screen 22 to bulge the screen 22 to the outside, thereby transferring the transfer cylinder 18. It is provided so as to be movable between a pressing position where it is brought into pressure contact with the pressing member. This squeegee roller 23
Is rotated together with the plate cylinder 17, and at the time of rotation, the ink 21 is supplied from the inner surface of the screen 22 by utilizing the gap with the doctor roller 24. A stencil clamp 25 is provided on the outer periphery of the plate cylinder 17. The stencil 11 is clamped by the stencil clamp 25 to wind and mount the stencil 11 on the outer peripheral surface.

A transfer cylinder 18, which is a transfer member, is disposed near the lower portion of the plate cylinder 17, and is rotatably supported by the apparatus main body 20 about a transfer cylinder shaft 18a. An ink transfer sheet 26 on which ink can be transferred is wound around the outer periphery of the transfer cylinder 18. The ink transfer sheet 26 is an elastic member and an oil-resistant sheet, and is made of, for example, nitrile rubber. Further, a concave portion 18 b is provided on a part of the outer circumference of the transfer cylinder 18 to avoid the stencil clamping portion 25 of the plate cylinder 17.

The impression cylinder 19 is provided rotatably about an impression cylinder shaft 19a in the vicinity of the lower portion of the transfer cylinder 18 and has a press-contact position for pressing the transfer cylinder 18 and a standby position for separating from the transfer cylinder 18. It is provided so as to be movable between them. Further, a concave portion 19b is provided on a part of the outer periphery of the impression cylinder 19, and the concave portion 1b is provided.
9b is provided with a paper clamp 27. The paper clamp unit 27 is connected to the transfer cylinder 18 and the impression cylinder 1 from the paper feed mechanism 4.
9 is clamped at the leading end of the printing paper 28 conveyed between the printing paper 9 and the clamp at the entrance of the paper discharging mechanism 5 and released.

That is, the plate cylinder 17, the transfer cylinder 18, and the impression cylinder 1
9 are rotated in the same direction and at the same peripheral speed at the places where they are close to and pressed against each other. And the squeegee roller 23
Is moved from the standby position to the pressing position, the screen 2
2 swells outward and is pressed against the transfer cylinder 18, and the ink 21 that oozes from the perforations of the stencil sheet 11 is transferred to the transfer cylinder 18 by the pressing force, that is, the ink image is transferred to the ink transfer sheet 26 of the transfer cylinder 18. You. At a predetermined timing, the printing paper 28 is transported from the paper feeding mechanism 4 between the transfer cylinder 18 and the impression cylinder 19, and the ink image of the ink transfer sheet 26 of the transfer cylinder 18 is transferred to the printing paper 28. The printing paper 28 to which the ink image has been transferred is sent to the paper discharging mechanism 5.

The paper feed mechanism 4 is used to print the printing paper 2
8, a scraper 30 that presses against the uppermost one of the printing papers 28 stacked on the sheet feeding table 29, a pickup roll 31 and a sabaki roll located downstream of the conveyance of the scraper 30. 32, a guide roll 33 and a timing roll 3 disposed downstream of the conveyance of the pickup roll 31 and the sabaki roll 32.
And 4. Guide roll 33 is timing roll 3
4 can be moved between the pressed position and the separated position. A paper feed sensor (not shown) for detecting the printing paper 28 is provided between the pickup roll 31 and the sabaki roll 32 and the guide roll 33 and the timing roll 34.

That is, the rotation of the scraper 30 causes only one sheet of the printing paper 28 on the paper feed table 29 to move between the guide roll 33 and the timing roll 34 due to the sabaki action of the pickup roll 31 and the sabaki roll 32. The printing paper 28 thus conveyed is synchronized with the rotation of the plate cylinder 17, the transfer cylinder 18 and the impression cylinder 19 by the rotation of the timing roll 34, and the transfer between the transfer cylinder 18 and the impression cylinder 19 is performed at a predetermined timing. It is supplied in between.

The paper discharge mechanism 5 includes an impression cylinder 1 located at a pressure contact position.
9, a paper discharge guide roll 35 and a separation claw 36 which are substantially in contact with the outer periphery of the upper and lower paper discharge rolls 3 disposed downstream of the conveyance.
7, 38, and a paper discharge table 39 disposed downstream of the conveyance. A paper discharge sensor (not shown) for detecting the printing paper 28 is provided between the paper discharge guide roll 35 and the separation claw 36 and the upper and lower paper discharge rolls 37 and 38.

That is, the paper ejection guide roll 35 and the separation claw 3
6 is guided between the upper and lower discharge rolls 37 and 38 by a discharge path between the discharge guide roll 35 and the separation claw 36, and the printing paper 28 is vertically moved. The discharge rollers 37 and 38 rotate to discharge paper onto a paper discharge tray 39, and the discharged printing paper 28 is stacked on the paper discharge tray 39.

The stencil discharging mechanism 6 includes a guide belt 40 for guiding the leading end of the stencil sheet 11 released from the stencil clamp portion 25 of the plate cylinder 17, a guide roll 41 which is pressed against the guide belt 40 and rotates following the guide belt 40. A stencil sheet 11 for accommodating the stencil sheet 11 conveyed by the belt 40 and the guide roll 41;

That is, the stencil sheet 11 unclamped
Of the stencil sheet 11 is guided between the guide belt 40 and the guide roll 41, and the stencil sheet 11 thus guided is guided by the guide belt 40.
Of the stencil sheet 11 and the rotation of the guide roll 41, and the stencil sheet 11 thus transported is stored in the stencil discharge box 42.

Further, as shown in FIG.
Is provided with an operation panel 43 which is an input and display means.
a, a start key 43b, a stop key 43c, a confidential plate making key 43d, a numeric keypad 43e, etc., and a display panel section 43f for displaying various data. Here, confidential plate making is
When the printing of the set number of sheets is completed, the perforated stencil sheet 11 used for the printing is discharged, and the perforated stencil sheet 11 having no perforation is wound around the plate cylinder 17 and mounted. As a result, printing on the stencil sheet 11 that has been made stencil is made impossible and confidentiality is maintained.

Next, the control system of the stencil printing machine 1 will be described. As shown in FIG. 3, the input data of the operation panel 43 is output to the control means 44, which controls the plate making mechanism 2, the printing mechanism 3, the paper feeding mechanism 4, and the paper discharging mechanism 5 based on the input data. And the plate discharging mechanism 6 to control the buzzer 45 and the like, and also controls the display of the operation panel 43 on the display panel 43f. Further, a backup battery 46 is connected to the control means 44 so that the display panel 43f and the buzzer 45 of the operation panel 43 can be controlled for a fixed time even after the main power is turned off. or,
The control means 44 has a built-in press timer (not shown),
For example, the lapse of time from the end of the printing operation can be managed. The control unit 44 controls writing and reading of the ROM 47 and RAM 48 storing various programs and the storage unit 49 for storing necessary data, and executes, for example, the flow shown in FIGS. 4 and 5.
The details of this control will be described in detail in the following operation.

Next, the operation of the above configuration will be described with reference to FIGS.

As shown in FIG. 4, when the entire apparatus is initialized (step S1), whether or not to select automatic confidentiality is displayed on the display panel 43f of the operation panel 43, for example. (Step S2). If the user does not select the automatic confidentiality, a printing operation is executed (step S).
3) When the printing operation is completed, the press timer is reset and the process returns to the main program (steps S4 and S4).
5). When the user selects the automatic confidentiality, the set time until the automatic confidentiality is set.
(Step S6). This setting time is
A time is input such that the ink 21 does not dry due to contact with the outside air, for example, a time of about 5 hours. The data of the inputted set time is stored in the storage means 49 (step S7).

Then, the printing operation for the set number of sheets is executed (step S8). When the printing operation is completed, the press timer is reset (step S9), and the elapsed time from the end of the printing operation is counted by the press timer, It is checked whether or not the set time stored in the storage means 49 has elapsed (step S10). If the elapsed time from the end of the printing operation has exceeded the set time, the stencil sheet 11 attached to the plate cylinder 17 is removed and the non-perforated stencil sheet 11 is removed if the last final printing operation is not confidential. An automatic confidential plate making operation of winding around the plate cylinder 17 is performed (steps S11 and S12), and the process returns to the main program (step S13). If the last final printing operation is confidential plate making, the process returns to the main program without performing automatic confidential plate making (steps S11 and S13).

As shown in FIG. 5, if the main power is turned off by turning off a main switch or a power failure before a predetermined set time has elapsed from the end of the final printing operation (step S20), If the final printing operation is not confidential plate making (step S21), the display panel unit 43 of the operation panel 43 is operated by using the power supply of the battery 46 or the like.
A message "Power is turned off without confidential plate making" is displayed on f (step S22), and the buzzer 45 is sounded for, for example, three seconds (step S23).

As described above, when a predetermined set time has elapsed from the end of the final printing operation, the stencil sheet 11 attached to the plate cylinder 17 is removed, and the non-perforated stencil sheet 11 is removed.
7, the automatic stencil making operation of wrapping around the plate 7 is performed.
Since the stencil sheet 1 is prevented from contacting the outside air through the holes of the stencil sheet 11, clogging of the ink 21 caused by leaving the perforated stencil sheet 11 mounted on the plate cylinder 17 for a long time can be prevented. As a result, in the subsequent printing, the number of sheets to be started is reduced, so that preparation time before printing is reduced, labor load is reduced, printing materials are saved, production efficiency is improved, and settlement costs are reduced.

In this embodiment, the automatic stencil making operation is not performed when the final printing operation is a stencil making operation in which the non-perforated stencil sheet 11 is mounted on the plate cylinder 17 and finished. Since the operation is performed only when the confidential platemaking is not performed, useless automatic confidential platemaking operation can be avoided.

In this embodiment, if the main power supply is turned off before a predetermined time has elapsed from the end of the final printing operation, a warning is issued to prompt the user to perform confidential plate making. If the confidential stencil making operation is executed by this warning, it is possible to prevent the stencil sheet 11 perforated from being left for a long time while being attached to the plate cylinder 17. The warning method may be either display or warning, but both are more effective as in this embodiment. Further, another method may be used as long as it can give a warning to the user.
In this embodiment, the message "Power will be cut off without performing confidential plate making" is displayed. However, the displayed content may be any content that prompts confidential plate making.

In this embodiment, the set time from the end of the final printing operation to the execution of the automatic confidential printing operation is as follows:
Since the setting time can be set arbitrarily, the set time can be set or changed appropriately according to the characteristics of the ink, the environment in which the apparatus is installed, and the like.

According to the above-described embodiment, the stencil printing apparatus 1 heat-perforates the stencil sheet 11 based on desired image information, winds the heat-perforated stencil sheet 11 around the plate cylinder 17, mounts the stencil sheet on the stencil sheet 17, The transfer cylinder 18 is rotated while being pressed against the rotating plate cylinder 17, the ink image is temporarily transferred to the transfer cylinder 18, and the printing paper 28 is moved while being pressed against the rotating transfer cylinder 18 to contact the printing paper 28. This is for transferring an ink image. However, the present invention can be similarly applied to an apparatus in which the printing paper 28 is moved while being pressed against the rotating plate cylinder 17 and the ink image is directly transferred to the printing paper 28 without having the transfer cylinder 18.

[0041]

As described above, according to the first aspect of the present invention, a stencil sheet perforated based on image information is wrapped around a plate cylinder and mounted, and ink oozing from the perforations in the stencil sheet is directly discharged. Or, in a stencil printing apparatus that transfers a printing material to a printing medium via a transfer member, when a predetermined set time has elapsed from the end of the final printing operation, the stencil sheet attached to the plate cylinder is removed, and no punching is performed. Since the automatic stencil making operation of winding and mounting the stencil sheet around the plate cylinder is performed, after a predetermined set time has elapsed from the end of the final printing operation, the ink in the plate cylinder is stenciled by the non-perforated stencil sheet. Since it is possible to prevent the perforated stencil paper from being exposed to the outside air from the holes, it is possible to prevent clogging of ink caused by leaving the perforated stencil sheet mounted on the plate cylinder for a long time. As a result, in the subsequent printing, the number of sheets to be started is reduced, so that preparation time before printing is reduced, labor load is reduced, printing materials are saved, production efficiency is improved, and settlement costs are reduced.

According to a second aspect of the present invention, in the stencil printing machine according to the first aspect, the automatic stencil making operation is such that the final printing operation is completed by mounting a non-perforated stencil sheet on the plate cylinder. In the case where the final printing operation is not a confidential printing operation, the confidential printing operation is performed when the stencil sheet with no perforation is mounted on the plate cylinder. Since it is not performed, useless automatic confidential plate-making operation can be avoided.

According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect, the main power supply is turned off before a predetermined time has elapsed from the end of the final printing operation. In such a case, a warning is issued to urge confidential plate making. In addition to the effects of the invention of claim 1 or claim 2,
The user can be alerted by the warning, so that it is possible to prevent the perforated stencil sheet from being left for a long time while being attached to the plate cylinder.

According to the fourth aspect of the present invention, in the stencil printing apparatus according to any one of the first to third aspects, the set time from when the final printing operation is completed to when the automatic confidential printing operation is performed can be arbitrarily set. Therefore, in addition to the effects of the first to third aspects of the present invention, the set time can be set or changed appropriately according to the characteristics of the ink, the environment in which the apparatus is installed, and the like.

[Brief description of the drawings]

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

FIG. 2 is a front view of an operation panel according to the embodiment of the present invention.

FIG. 3 is a schematic circuit block diagram of a stencil printing machine, showing an embodiment of the present invention.

FIG. 4 is a flowchart illustrating an automatic confidential plate making process according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a power-off state according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stencil printing machine 2 stencil making mechanism 3 printing mechanism 4 paper feeding mechanism 5 paper discharging mechanism 6 stencil discharging mechanism 11 stencil sheet 17 plate cylinder 18 transfer cylinder 19 impression cylinder 28 printing paper (substrate to be printed) 43 operation panel 43 f display panel section 45 buzzer 49 storage means

Claims (4)

[Claims] 1. A stencil for wrapping a stencil sheet perforated on the basis of image information around a plate cylinder and transferring ink oozing from the perforations of the stencil sheet directly to a printing medium via a transfer member. In the printing apparatus, when a predetermined set time has elapsed since the end of the final printing operation, the stencil sheet attached to the plate cylinder is removed, and
A stencil printing machine which performs an automatic confidential stencil making operation in which a non-perforated stencil sheet is wound around the plate cylinder and mounted. 2. The stencil printing machine according to claim 1, wherein the automatic stencil making operation is not performed when the final printing operation is a stencil making operation in which a non-perforated stencil sheet is mounted on a plate cylinder and finished. A stencil printing apparatus, wherein the final printing operation is performed when the stencil printing is not a confidential printing operation. 3. The stencil printing machine according to claim 1, wherein the main power is turned off before a predetermined time has elapsed from the end of the final printing operation. A stencil printing device, which issues a warning to prompt the user to perform the operation. 4. A stencil printing apparatus according to claim 1, wherein the set time from the end of the final printing operation to the start of the automatic stencil making operation can be set arbitrarily. apparatus.