JPH08150769A - Stencil printing plate printer - Google Patents

Abstract

PURPOSE: To avoid occurrence of irregularity of an image caused by nonuniformity of an ink on the surface of a printing cylinder by controlling the number of pressing of a press roller in accordance with various conditions such as environmental temp. and the number of sheets of printing papers in the preceding printing process. CONSTITUTION: When a press roller 2 presses a sheet member 3 to a rotating original paper of a stencil printing plate 8 by specified times before fitting a new original paper of a stencil printing plate on a printing cylinder 1, environmental temp. data detected by means of a temp. detecting member 16 and pause time data integrated by means of a built-in clock 23 are input into a CPU 18 and these are prepd. in advance based on the environmental temp. data and the pause time data. Being compared with data of the table of the number of pressing of the press roller, the optimum number of pressing of the press roller 2 at that time is determined. Based on it, a command is output from the CPU 18 and the press roller and a solenoid 6 are actuated.

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 for printing using a stencil sheet.

[0002]

2. Description of the Related Art A conventional stencil printing apparatus of this type has a plate making means, a large number of ink permeation holes, a cylindrical plate cylinder on the outer periphery of which a stencil sheet is mounted, and an ink provided in the plate cylinder. The stencil sheet is provided with a supply means and a press roller for printing by pressing a printing paper on the stencil sheet, and the stencil sheet made by the plate making means is mounted on the outer periphery of the plate cylinder and rotated, and the ink is supplied by the ink supplying means. The supplied ink seeps out from the through holes of the stencil sheet and is printed on the printing paper which is pressed against the stencil sheet by the press roller.

By the way, in such a case, when the stencil sheet is left attached to the plate cylinder when the preceding printing process is completed and the subsequent printing process is started after an arbitrary pause time has elapsed, The ink contained in the mesh screen and through holes of the stencil paper is reduced by evaporation or absorption by the stencil paper, and when a new stencil paper is mounted and the subsequent printing process is started, this ink shortage causes There is a problem that a good image cannot be obtained. Therefore, in order to solve such a problem, several sheets of printing paper are passed through. However, since this causes so-called scrap paper, in order to prevent this, Japanese Patent Laid-Open Publication No.
The one disclosed in 4-129787 has been proposed.

Since its main part is similar to the embodiment of the present invention shown in FIG. 1, it will be explained with reference to this. It is movable between an operating position shown by a solid line inserted between the plate cylinder 1 and the press roller 2 and a standby position shown by a dotted line separated from the plate cylinder 1 and the press roller 2. A sheet member 3 is provided, and the sheet member 3 is in the standby position during the preceding printing process, and moves to the operating position when starting the subsequent printing process after the lapse of an arbitrary pause time after the completion of the printing process. Then, with the sheet member 3 interposed between the plate cylinder 1 and the press roller 2, the pressing operation by the press roller 2 is performed a predetermined number of times, and then the sheet member 3 is moved to the standby position and the stencil sheet 8 is After discarding, the new stencil sheet is mounted and the subsequent printing process is started. This is effective in eliminating the ink shortage at the beginning of the printing process on the new stencil sheet as described above. Although not shown in the drawings, a printing paper is used instead of the sheet member 3 (Japanese Patent Laid-Open No. 4-129785), or a plate-less base paper is newly added to the plate cylinder 1.
There is something to be attached to (Japanese Patent Laid-Open No. 4-175081).

[0005]

However, the operation as described above is affected by various conditions such as the down time, the environmental temperature, and the number of printed sheets in the preceding printing process. Insufficient ink cannot be eliminated, or the number of presses is too large, which unnecessarily increases the printing time and increases the load on the device. As a result, when the viscosity of the ink is high, as at low temperatures, or wrinkles occur in the stencil sheet after printing a large number of sheets, unevenness of the ink on the plate cylinder surface occurs, and the new stencil sheet is There are various problems such as image unevenness after mounting.

Therefore, an object of the present invention is to eliminate the problems of the conventional stencil printing apparatus as described above, and to press the press roller in accordance with various conditions such as down time, environmental temperature and the number of printed sheets in the preceding printing step. Controls the number of times, does not cause ink shortage due to too few pressing times, and conversely increases printing time unnecessarily due to too many pressing times,
It does not increase the load on the equipment, does not apply unreasonable force to the stencil sheet, and the ink viscosity is high as at low temperature, or wrinkles occur on the stencil sheet after printing many sheets. An object of the present invention is to provide a stencil printing apparatus that does not cause unevenness of ink on the surface of the plate cylinder, and does not cause image unevenness after mounting a new stencil sheet.

[0007]

In order to achieve the above-mentioned object, the present invention according to claim 1 provides plate making means, a large number of ink permeation holes, and a stencil sheet on the outer periphery. The cylinder plate cylinder to be mounted, the ink supply means provided in the plate cylinder, and the press roller for printing by pressing the printing paper against the stencil sheet were provided, and the preceding printing process was completed. When the stencil sheet is left attached to the plate cylinder and the subsequent printing process is started after the lapse of an arbitrary rest time, the printing paper, the sheet member, or the newly plate-made unmade plate is placed on the plate cylinder and the press roller. In a stencil printing apparatus that presses the press roller a predetermined number of times in the state of being interposed between the press roller and the press roller, the number of presses of the press roller is controlled according to the pause time and the ambient temperature. To do According to a second aspect of the present invention, a plate making unit, a cylindrical plate cylinder provided with a large number of ink permeation holes and having a stencil sheet mounted on the outer periphery thereof, an ink supply unit provided in the plate cylinder, and It is equipped with a press roller that presses the printing paper against the stencil sheet to perform printing, and keeps the stencil sheet attached to the plate cylinder when the preceding printing process is completed, and the subsequent printing process after an arbitrary pause time has elapsed. To start
In the state where the printing paper, the sheet member, or the newly plate-less base paper, which is placed between the plate cylinder and the press roller,
In a stencil printing apparatus that presses a press roller a predetermined number of times as in printing, the number of presses of the press roller is controlled according to the rest time, the environmental temperature, and the number of printed sheets in the preceding printing step. is there. The invention according to claim 3 is the invention according to claim 1 or 2, characterized in that the ambient temperature is detected by a thermistor built in the thermal head of the plate making means.

[0008]

In the present invention as described above, in the same manner as the conventional one, the stencil sheet made by the plate making means is mounted on the outer circumference of the plate cylinder and rotated, and the ink supplied by the ink supplying means is Printing is performed on the printing paper that exudes from the through holes of the stencil sheet and is pressed against the stencil sheet by the press roller. In this way, when the stencil sheet is left attached to the plate cylinder when the preceding printing process is completed, and the subsequent printing process is started after the lapse of an arbitrary rest time, the sheet member or the printing paper at the standby position is After moving to the operating position between the plate cylinder and the press roller, and interposing this sheet member or printing paper between the plate cylinder and the press roller, the pressing operation by the press roller is performed a predetermined number of times, and then the sheet member. Alternatively, the printing paper is moved to the standby position, the stencil sheet is discarded, and a new stencil sheet is mounted to start the subsequent printing process.

According to the first aspect of the invention, in order to start the subsequent printing process as described above, the sheet member or the printing paper is placed on the plate cylinder before mounting the new stencil sheet on the plate cylinder. When the press roller is pressed a predetermined number of times while being interposed between the press roller and the press roller, the press roller is pressed the optimum number of times at that time based on the environmental temperature data and the rest time data. Further, in the invention of claim 2, in addition to the above-mentioned data, the print number data at the end of the preceding printing step is fetched, and the press roller is pressed by the optimum pressing number at that time based on these data. Further, in the invention of claim 3, the environmental temperature is detected by a thermistor built in the thermal head of the plate making means.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Many of the embodiments of the present invention shown in FIGS. 1 to 4 are the same as the conventional ones, and therefore only the main parts thereof are shown. In FIG. 1, 1 is a plate cylinder, 2 is a press roller which is arranged below the plate cylinder, and which is brought into contact with and separated from the plate cylinder 1 by an operating means (not shown), and 3 is shown by a solid line inserted between the plate cylinder 1 and the press roller 2. A sheet member that is movable between an operating position and a standby position shown by a dotted line that is separated from the plate cylinder 1 and the press roller 2. The sheet member 3 has an upper part on one side by a pivot 9. A bracket 4 pivotally supported on a machine frame (not shown) is attached to the opposite side of the pivot 9, and a pin 11 is attached to the lower part of the bracket 4. The pin 11 is pivotally supported on the machine frame by a pivot 12. The lever 6 is engaged with the upper two-forked portion of the lever 5, and the operating rod 13 of the solenoid 6 installed on the machine frame is attached to the lower two-forked portion of the lever 5.
The pin 14 provided in the above is fitted, and 7 is a spring.

FIG. 2 is a schematic block diagram of the operation of the above-mentioned one, in which 16 is a temperature detecting member comprising a thermistor built in a thermal head of a plate making means (not shown), and 17 is an environmental temperature detected by the temperature detecting member 16. A / D conversion unit for AD conversion, 18 a CPU for inputting temperature information converted by the A / D conversion unit, 19 an operation panel connected to the CPU 18, 20,
Reference numeral 21 is a ROM and RAM which are also connected to the CPU 18, 22 is a backup power source and is connected to the CPU 18 via an internal clock 23, 24 is a main body drive unit which operates the apparatus in response to a command from the CPU 18, and a solenoid 6 is connected from the CPU 18 It is designed to operate according to the command.

FIG. 3 shows the number of presses of the press roller 2 determined based on the pause time data accumulated by the built-in clock 23 and the environmental temperature data detected by the temperature detecting member 16, and FIG. In addition, the number of times the press roller 2 is pressed is determined based on the number of printed sheets data stored at the end of the preceding printing process stored in the RAM 20.

In the above-described embodiment, the stencil sheet 8 made by the plate making means is mounted on the outer periphery of the plate cylinder 1 and rotated and supplied by the ink supplying means in the same manner as the conventional one. The ink seeps out from the through holes of the stencil sheet 8 and prints on the printing paper that is pressed against the stencil sheet 8 by the press roller 2. In this way, when the preceding printing process is completed, the stencil sheet 8 is left attached to the plate cylinder 1, and when the subsequent printing process is started after the lapse of an arbitrary rest time, the solenoid 6 is operated to operate In FIG. 1, the lever 5 in the dotted line position is pulled by the pin 14 to swing clockwise about the pivot 12, and the lever 5 pulls the pin 11 to swing the bracket 4 counterclockwise about the pivot 9. Then, the seat member 3 attached to the bracket 4 is moved from the standby position to the operating position indicated by the solid line,
With the sheet member 3 interposed between the plate cylinder 1 and the press roller 2, the pressing operation by the press roller 2 is performed a predetermined number of times, and then the sheet member 3 is moved to the standby position and the stencil sheet 8 is discarded. In addition, the new stencil sheet is attached and the subsequent printing process is started. Although the sheet member 3 is used in this embodiment, a printing paper may be used instead of the sheet member 3, or a method for newly plate-pressing a plateless base paper may be adopted.

In order to start the subsequent printing process as described above, the stencil sheet 8 in which the press roller 2 rotates the sheet member 3 before the new stencil sheet is mounted on the plate cylinder 1.
When pressing a predetermined number of times, the ambient temperature data detected by the temperature detecting member 16 and the rest time data accumulated by the built-in clock 23 are input to the CPU 18, which is created in advance based on the ambient temperature data and the rest time data. These data are compared with the data of the press number table of the press roller 2 as shown in FIG. 3 stored in the ROM 20 to determine the optimum press number of the press roller 2 at that time, and based on that, An instruction is issued from the CPU 18 to activate the press roller 2 and the solenoid 6. As an example of this case, when the down time is 5 hours and the environmental temperature is 15 degrees, the press roller 2 is pressed twice.

In addition to the above-mentioned data, the number of printed sheets at the end of the preceding printing process stored in the RAM 20 is input to the CPU 18, and these data are stored in the ROM 20 as shown in FIG. The optimum pressing frequency of the press roller 2 at that time is determined by comparing with the data of the pressing frequency table of the roller 2, and the CPU 18 gives an instruction based on this to operate the press roller 2 and the solenoid 6. As described above, when the down time is 5 hours, the environmental temperature is 15 degrees, and the number of printed sheets is 2500, the press roller 2 is pressed once.

[0016]

The present invention is as described above, and the invention described in claim 1 is a plate making means, a cylindrical plate cylinder provided with a large number of ink permeation holes, and a stencil sheet mounted on the outer periphery thereof. ,
The stencil sheet was equipped with an ink supply means provided in the plate cylinder and a press roller for performing printing by pressing a printing paper on the stencil sheet, and the stencil sheet was mounted on the plate cylinder when the preceding printing process was completed. When starting the subsequent printing process after the lapse of an arbitrary waiting time, the printing paper, the sheet member or the newly plateless base paper is placed between the plate cylinder and the press roller. In the stencil printing apparatus that presses the press roller a predetermined number of times as in printing, the number of presses of the press roller is controlled according to the standby time and the environmental temperature, so that the time corresponding to the environmental temperature and the rest time The press roller can be pressed with the optimum number of presses, and the number of presses is too small to cause ink shortage, or the number of presses is too large to increase the printing time and increase the load on the device. If the stencil sheet does not have excessive force and the ink viscosity is high, or after printing a large number of sheets, wrinkles occur on the stencil sheet, causing ink unevenness on the plate cylinder surface. Image unevenness does not occur after mounting the stencil sheet, and a good image can be obtained from the beginning even after a long rest. Claim 2
The invention described in, the plate making means, a cylindrical plate cylinder provided with a large number of ink permeation holes, the stencil base paper is mounted on the outer periphery, an ink supply means provided in the plate cylinder, the stencil base paper It is equipped with a press roller that presses the printing paper to perform printing, keeps the stencil sheet mounted on the plate cylinder when the preceding printing process is completed, and starts the subsequent printing process after an arbitrary waiting time has elapsed. At that time, in a stencil printing apparatus that presses a press roller a predetermined number of times in the same manner as during printing, with a printing paper, a sheet member or a newly plate-less base paper that is not interposed between the plate cylinder and the press roller. Since the number of presses of the press roller is controlled in accordance with the standby time, the environmental temperature and the number of printed sheets in the preceding printing process, only the optimum number of presses at that time is supported in accordance with the standby time, the environmental temperature and the rest time. The press roller can be pressed, the number of presses is too small to cause ink shortage, the number of presses is too large to increase the printing time, and the load on the device is not increased. Force is not applied and the viscosity of the ink is high, or wrinkles occur on the stencil sheet after printing a large number of sheets, causing ink unevenness on the plate cylinder surface, and image unevenness after mounting a new stencil sheet. There is an effect that it does not occur and a good image can be obtained from the beginning even after a long rest. According to a third aspect of the present invention, in the invention according to the first or second aspect, the ambient temperature is detected by a thermistor incorporated in the thermal head of the plate making means, so a circuit for detecting the ambient temperature is newly provided. There is an effect that it is possible to perform accurate detection at low cost without the need to provide.

[Brief description of drawings]

FIG. 1 is a front view of a main part of an embodiment of the present invention.

FIG. 2 is a schematic block diagram of the above operation.

FIG. 3 is a press roller pressing frequency table of the above.

FIG. 4 is a press roller pressing frequency table when other data is added.

[Explanation of symbols] 1 plate cylinder 2 press roller 3 sheet member 4 bracket 5 lever 6 solenoid 7 spring 8 hole stencil paper 9 axis 11 pin 12 axis 13 actuating rod 14 pin 16 temperature detection member 17 A / D converter 18 CPU 19 operation Panel 20 ROM 21 RAM 22 Backup power supply 23 Built-in clock 24 Main unit drive

Claims (3)

[Claims] 1. A plate making means, a cylindrical plate cylinder provided with a large number of ink permeation holes and having a stencil sheet mounted on the outer periphery thereof, an ink supply means provided in the plate cylinder, and printing on the stencil sheet. A press roller that presses the paper for printing is used, and when the preceding printing process is completed, the stencil sheet is left attached to the plate cylinder, and the subsequent printing process is started after an arbitrary pause time has elapsed. In the stencil printing apparatus, which presses the press roller a predetermined number of times in the same manner as at the time of printing, in a state where the printing paper, the sheet member or the newly mounted plateless base paper is interposed between the plate cylinder and the press roller, A stencil printing machine, characterized in that the number of presses of the press roller is controlled in accordance with the rest time and the ambient temperature. 2. A plate making means, a cylindrical plate cylinder provided with a large number of ink permeation holes and having a stencil sheet mounted on the outer periphery thereof, an ink supply means provided in the plate cylinder, and printing on the stencil sheet. A press roller that presses the paper for printing is used, and when the preceding printing process is completed, the stencil sheet is left attached to the plate cylinder, and the subsequent printing process is started after an arbitrary pause time has elapsed. In the stencil printing apparatus, which presses the press roller a predetermined number of times in the same manner as at the time of printing, in a state where the printing paper, the sheet member or the newly mounted plateless base paper is interposed between the plate cylinder and the press roller, A stencil printing apparatus, wherein the number of presses of the press roller is controlled in accordance with the rest time, the environmental temperature, and the number of printed sheets in the preceding printing step. 3. The stencil printing machine according to claim 1, wherein the ambient temperature is detected by a thermistor built in the thermal head of the plate making means.