JP2000318284A - Method and apparatus for stencil printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To again print by using a master already made and wound on a plate cylinder by eliminating wastefullness to continuously make the same master in the case that image data of the same contents is continuously input. SOLUTION: The method for stencil printing comprises the steps of comparing new image data with the image data of the master already stored in an image data memory of a master wound on an outer periphery of a plate cylinder 1 (S3) when the new data is input the memory (S1), eliminating making of the master corresponding to the new data in the case that the two image data are judged to be the same by the comparison, and again printing by using the master wound on the periphery of the cylinder (S7).

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 performing printing by winding a master melt-punched (plate making) using a thermal head around an outer peripheral surface of a porous cylindrical plate cylinder.

[0002]

2. Description of the Related Art In a conventional stencil printing apparatus, when image data of each document read by a scanner or image data output from an image data output device such as a raster image processor is input, the image data is output. Is made, and the master is wound around the outer peripheral surface of the plate cylinder to perform printing. Therefore, regardless of the difference in the content of each image data, master plate making is performed for each image data.

When the image data of the original read by the scanner is the same as the image of the original subsequently read by the scanner, or when the image data output from the image data output device is continuously the same. Even if there is, a master is made for each image data. That is, the same master is continuously made.

[0004]

When image data of the same content is continuously input, making the same master continuously in correspondence with each of the image data is a waste of time for making the plate. , And the master is wasted.

Accordingly, the present invention eliminates the waste of making the same master continuously when image data of the same content is successively input, and eliminates the master that has already been made and wound on the plate cylinder. It is an object of the present invention to provide a stencil printing method and a stencil printing apparatus that perform printing again using the stencil printing method.

[0006]

According to the first aspect of the present invention,
Making a master corresponding to the image data input to the image data storage unit, winding the master made on the outer peripheral surface of a hollow cylindrical plate cylinder, rotating the plate cylinder about an axis, and rotating with the plate cylinder In a stencil printing method in which printing is performed by pressing a printing sheet on a master, when new image data is input to the image data storage unit, the new image data is wound around the outer peripheral surface of the plate cylinder. The image data of the master is compared with the image data already stored in the image data storage unit. If the comparison determines that the two image data are different,
The master wound around the outer peripheral surface of the plate cylinder is discharged, the master corresponding to the new image data is made, and the master made is wound around the outer peripheral surface of the plate cylinder for printing. When it is determined that the two image data are the same, the master making the master corresponding to the new image data is not performed, and the printing using the master already wound on the outer peripheral surface of the plate cylinder is performed again. I made it.

Therefore, when the input new image data is the same as the image data of the master already made and wound around the plate cylinder, the master making of the master corresponding to the new image data is performed. Instead, printing is performed again using the master wound around the plate cylinder. Even when such printing is performed, the same printed matter is obtained as in the case where printing is performed by making a master according to new image data, and printing is performed by using the master already wound around the plate cylinder. No inconvenience occurs. In addition, there is no waste of time for making masters and no waste of masters.

On the other hand, if the inputted new image data is different from the image data of the master already made and wound on the plate cylinder, the master wound on the plate cylinder is discharged, and a new plate is discharged. A master corresponding to the image data is made, and the made master is wound around the outer peripheral surface of the plate cylinder to perform printing.

According to a second aspect of the present invention, in the stencil printing method of the first aspect, new image data input to the image data storage unit and image data of a master wound around the outer peripheral surface of the plate cylinder. Is determined to be the same, it is determined whether or not the number of prints by the master wound on the outer peripheral surface of the plate cylinder is equal to or more than the number of printing presses. Performs printing using the master already wound on the outer peripheral surface of the plate cylinder, and discharges the master wound on the outer peripheral surface of the plate cylinder and prints a new sheet if the number of prints is equal to or more than the number of printings. The master corresponding to the image data is subjected to plate making, or the fact that the number of printings is equal to or more than the number of printing endurance is notified.

[0010] Here, the printing endurance is the number of prints that can maintain the quality of a printed image in a good state when printing is performed by one master, and includes the type of master, printing paper, ink used, and the like. , For example, about 2,000 sheets.

Therefore, it is possible to prevent continuation of printing using the master whose number of printings exceeds the number of printings, and to prevent deterioration of the quality of a printed image caused by printing exceeding the number of printings.

If it is notified that the number of prints is equal to or more than the number of printings, the operator performs printing by using the master wound around the plate cylinder, or performs printing by making a new master. To switch.

According to a third aspect of the present invention, there is provided a plate making section for plate making a master corresponding to input image data, and a porous member provided rotatably about an axis and around which the master made is wound. It has a cylindrical plate cylinder and a plate discharging section for peeling and discharging the master wound around the outer peripheral surface of the plate cylinder, and printing on a master wound around the outer peripheral surface of the plate cylinder and rotating together with the plate cylinder. In a stencil printing apparatus that performs printing by pressing a sheet, two page memories for storing input image data for each master, and storage for storing input new image data in one of the page memories. Means, new image data stored in one of the page memories, and image data of a master wrapped around the outer peripheral surface of the plate cylinder, and the other page data. A comparison unit that compares the image data stored in the storage unit with the image data stored in the storage unit. A first printing for executing plate making by the plate making section of the master corresponding to the above, winding of the plate made master around the outer peripheral surface of the plate cylinder, and printing using the master wound around the outer peripheral surface of the plate cylinder. When it is determined that the two image data are the same based on the result of the comparison by the control unit and the comparing unit, a second printing operation is performed using the master already wound on the outer peripheral surface of the plate cylinder. 2 printing control means.

Therefore, when new image data for one input master is stored in one page memory, the new image data and the master image data wound around the outer peripheral surface of the plate cylinder are used. Is compared with the one stored in the other page memory by comparing means.
If it is determined that the two image data are the same, the master making process corresponding to the new image data is not performed, and printing is performed again using the master wound around the plate cylinder. Even when such printing is performed, the same printed matter is obtained as in the case where printing is performed by making a master according to new image data, and printing is performed by using the master already wound around the plate cylinder. No inconvenience occurs. In addition, there is no waste of time for making masters and no waste of masters.

On the other hand, if it is determined that the inputted new image data is different from the image data of the master already made and wound on the plate cylinder, the master wound on the plate cylinder is discharged. Then, a master corresponding to the new image data is made, and the printed master is wound around the outer peripheral surface of the plate cylinder to perform printing.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a switching circuit for switching which page memory stores the input image data is provided. At the time of execution of the control unit, switching is performed so that the next input image data is stored in a page memory other than the page memory storing the image data used in the first print control unit.

Therefore, when new image data is input, the image data is stored in a page memory other than the page memory in which the master image data wound around the plate cylinder is stored. Thus, the new image data is prevented from being overwritten on the master image data wound around the plate cylinder. For this reason, even when the image data of the master wound around the plate cylinder and the new image data are the same, the waste of making a master corresponding to the new image data is reliably prevented.

[0018]

FIG. 1 shows a first embodiment of the present invention.
A description will be given based on FIG. FIG. 1 is a front view showing a schematic structure of a stencil printing apparatus, FIG. 2 is a block diagram showing a control configuration of the stencil printing apparatus, and FIG. 3 is a flowchart for explaining stencil making and printing operations.

As shown in FIG. 1, this stencil printing machine has:
A porous cylindrical plate cylinder 1 provided rotatably about an axis, a press roller 2 provided movably to a position that comes into contact with and separated from the outer peripheral surface of the plate cylinder 1, and wound around the outer peripheral surface of the plate cylinder 1 A plate making section 4 for making a master 3 to be printed, a plate discharging section 5 for peeling off the master 3 from the plate cylinder 1 and discharging the plate, and a registration timing for feeding the printing paper 6 fed between the plate cylinder 1 and the press roller 2 A roller 7, a printing unit 8 (see also FIG. 2) for performing printing on the printing paper 6, a suction transport mechanism 10 for transporting the printing paper 6 on which printing has been completed to the discharge tray 9, and the like are provided.

The plate making section 4 includes a platen roller 11 that is driven to rotate by a stepping motor (not shown), a thermal head 12 having a large number of heating elements and pressed against the outer peripheral surface of the platen roller 11, and wound in a roll. And a cutter 14, a master guide plate 15, and the like. Platen roller 1
1 is driven to rotate, the rolled master base paper 3a is pulled out, and the heating elements of the thermal head 12 generate heat in accordance with the image data output from the raster image processor 16 (see FIG. 2). The master 3 corresponding to the image data is heated and melt-punched (plate making).

The master 3 on which the plate is made is a master guide plate 15
It is conveyed upward toward the plate cylinder 1 and wound around the outer peripheral surface of the plate cylinder 1. The cutter 14 is driven at a predetermined timing according to the number of steps of the stepping motor, and the master 3 is cut to a predetermined length.

A clamper 17 connected to an opening / closing mechanism (not shown) is provided on the outer peripheral surface of the plate cylinder 1 so as to be openable and closable, and is opened at a position facing the leading end of the master guide plate 15. By rotating the clamper 17 to the closed position at a predetermined timing, the tip of the master 3 conveyed from the plate making section 4 is clamped by the clamper 17.

In the inside of the plate cylinder 1, an ink pipe 18 which is located on the axis of the plate cylinder 1 and also serves as a support shaft for rotatably supporting the plate cylinder 1 is provided between the ink pipe 18 and the inner peripheral surface of the plate cylinder 1. The ink roller 19, which is driven to rotate in the same direction as the plate cylinder 1 (counterclockwise direction indicated by the arrow) with a small gap, and the doctor roller 2 disposed with a small gap between the ink roller 19 and the outer peripheral surface of the ink roller 19
0 and the like are provided. In a portion sandwiched between the outer peripheral surface of the ink roller 19 and the outer peripheral surface of the doctor roller 20, an ink reservoir 21 for storing the ink supplied from the ink pipe 18 is formed.

The plate discharge section 5 includes a plate discharge storage box 22, a peeling claw (not shown) for peeling the end of the master 3 wound around the outer peripheral surface of the plate cylinder 1 from the outer peripheral surface of the plate cylinder 1, The master 3 includes a plate discharge roller 23 that feeds the master 3 peeled from the outer peripheral surface of the plate cylinder 1 into the plate discharge storage box 22 with claws.

The printing unit 8 includes a stepping motor (not shown) for driving the plate cylinder 1 to rotate about its axis, and a moving mechanism (FIG. 1) for moving the press roller 2 in the direction of coming into contact with and separating from the outer peripheral surface of the plate cylinder 1. ), And a rotation drive mechanism (not shown) of the registration roller 7.

The suction transport mechanism 10 is wound around a peeling claw 24 for peeling the leading end of the printing paper 6 from the master 3, a pair of transport rollers 25 and 26, at least one of which is driven to rotate, and transport rollers 25 and 26. Transport belt 2
7, a suction fan 28 for sucking the printing paper 6 onto the transport belt 27, and the like.

FIG. 2 is a block diagram showing a control configuration of the stencil printing apparatus. The stencil printing apparatus includes a raster image processor 16 for outputting image data (image data for each master) and data of the number of prints. It is connected.
The stencil printing apparatus has two page memories (a first page memory 29 and a second page memory 30) which are image data storage units for storing input image data.
A comparison circuit 31 compares the image data stored in the second page memories 29 and 30 and outputs a control signal to the plate discharging unit 5, the plate making unit 4 and the printing unit 8 according to the comparison result. A first switching circuit 32 for switching which of the first and second page memories 29, 30 is stored in the first and second page memories 29, 30;
A second switching circuit 33 for switching which of the second page memories 29 and 30 is called is provided. The first switching circuit 32 and the second switching circuit 33 are configured to be switched in conjunction with each other.

In such a configuration, a series of operations of stencil making and printing by the stencil printing apparatus will be described with reference to the flowchart of FIG. First, it is determined whether new image data has been input (step S1). If new image data has been input, the input new image data is stored in the first page memory 29 (step S1). S
2) Here, storage means is executed. In the description of step S2, it has been described that the input new image data is stored in the first page memory 29. However, this is because the first switching circuit 32 operates as shown in FIG.
When the first switching circuit 32 is switched to the second page memory 30, the input new image data is stored in the second page memory 30. .

After the input new image data is stored in the first page memory 29, the new image data
The image data stored in the second page memory 30 (this image data is stored in the master 3
Is compared by the comparing circuit 31 (step S3), and the comparing means is executed here.

If it is determined in step S3 that the two image data are different (N in step S3),
A control signal is output from the comparison circuit 31 to the first and second switching circuits 32 and 33, and the first and second switching circuits 32 and 33 are output.
Are switched as shown by a dashed line in FIG. 2 (step S4). Further, from the comparison circuit 31 to the plate discharge unit
And a control signal is output to the plate making section 4 and the printing section 8, and the plate cylinder 1
(Step S5), the master 3 in accordance with the new image data stored in the first page memory 29, and the outer circumferential surface of the plate cylinder 1 of the master 3. (Step S6)
Printing using the master 3 that has performed plate making and winding (step S7) is performed, and the first print control unit is executed here.

Next, when it is determined in step S3 that the two image data are the same (step S3
In (Y), a control signal is output only from the comparison circuit 31 to the printing unit 8, and printing is performed using the master 3 already wound around the plate cylinder 1 (step S7). The print control unit is executed. When the second print control unit is executed, the same printed matter as when the master 3 corresponding to the new image data is made and printed is obtained, and the master 3 already wound around the plate cylinder 1 is used. The printing does not cause any inconvenience. In addition, waste of time for making the master 3 and waste of the master 3 are eliminated.

Here, when the first printing control means (steps S4 to S7) is executed, the first switching circuit 32 does not store the image data used in the printing, as indicated by the dashed line. When the next page memory (here, the second page memory 30) is switched to the next new image data, the image data is stored in the second page memory 30. Therefore, the next input new image data is overwritten on the image data of the master 3 (here, the image data stored in the first page memory 29) wound around the plate cylinder 1. Is prevented.

When the image data of the master 3 wound around the plate cylinder 1 is stored in the first page memory 29, the next input image data is stored in the first page memory 29.
Is overwritten on the image data stored in the second page memory 30, the comparison circuit 31 outputs image data that is not the image data of the master 3 wound around the plate cylinder 1 (the image data stored in the second page memory 30). ) Is compared with the next input image data. For this reason, even if the image data of the master 3 wound around the plate cylinder 1 and the next input image data are the same,
It is determined that the two image data are different, and there is a waste that plate discharging, plate making, and the like are performed.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is basically the same as the first embodiment, except that the number of printing endurance (for example, 2000
The printing is performed so as to prevent continuation of printing by the master 3 exceeding the number of sheets.

That is, the comparison means is executed (step S
3) If it is determined that the two pieces of image data are the same (Y in step S3), it is determined whether the number of prints by the master 3 wound on the outer peripheral surface of the plate cylinder 1 is equal to or greater than the number of printable sheets. Is determined (step S8). This decision
The control is performed by the control unit of the stencil printing apparatus based on the data of the counter that counts the number of prints.

If it is determined that the number of prints is equal to or less than the number of printable sheets (Y in step S7), the quality of the printed image can be maintained in a good state even if printing is continued using the master 3. Printing using the master 3 already wound on the plate cylinder 1 is performed (step S7). On the other hand, when it is determined that the number is equal to or more than the number of printings (N in step S7), the processing from step S4 to step S6 is performed, and the new master 3 that has been made and wound around the plate cylinder 1 is used. Printing is performed (step S7).

Therefore, it is possible to prevent printing from being performed continuously by using the master 3 that has already exceeded the number of printable sheets, and to prevent deterioration in image quality due to printing using the master 3 that has exceeded the number of printable sheets.

In the present embodiment, when it is determined that the number of prints is equal to or greater than the number of endurable prints (N in step S7)
Has been described as an example in which the processing from step S4 to step S6 is performed unconditionally.
From step 4, the process may not enter the processing of step S <b> 6, and the fact that the number of prints has exceeded the number of prints may be notified by an alarm sound, lamp lighting, or the like. When such a notification mechanism is provided,
Based on the notification, printing is performed by the master 3 wound around the plate cylinder 1 or printing is performed by making a new master 3 based on the judgment of the operator.

[0039]

According to the stencil printing method according to the first aspect of the present invention, when the input new image data is the same as the image data of the master already made and wound on the plate cylinder, Does not make the master plate corresponding to the new image data, but prints again using the master wound around the plate cylinder, so that the time required to make the master plate is saved and the printing work efficiency is improved. In addition, it is possible to save resources by eliminating waste of the master.

According to the stencil printing method of the second aspect of the present invention, in the first aspect of the present invention, the new image data input to the image data storage unit and the master wrapped around the outer peripheral surface of the plate cylinder. If it is determined that the image data is the same, it is determined whether or not the number of prints by the master wound on the outer peripheral surface of the plate cylinder is equal to or greater than the number of printable sheets. In order to perform printing using the master already wound on the outer peripheral surface of the plate cylinder, and when the number of prints is equal to or more than the number of prints, the master wound on the outer peripheral surface of the plate cylinder is discharged and a new Since the master corresponding to the image data is made plate or notified that the number of printings is equal to or more than the number of printings, it is possible to prevent continuous printing using the master exceeding the number of printings, and to reduce the number of printings. Master printing beyond Thereby preventing quality degradation of the printed image by Ukoto.

According to the stencil printing apparatus of the third aspect, when new image data for one input master is stored in one page memory, the new image data and the outer periphery of the plate cylinder are stored. The comparison means compares the image data of the master wrapped around the surface with the image data stored in the other page memory, and if it is determined that the two image data are the same, a new image data Printing is performed again using the master wrapped around the plate cylinder without performing plate making of the master corresponding to the above, so that it is possible to improve the work efficiency of the printing work without wasting time for making the master plate, and In addition, resources can be saved by eliminating waste of the master.

According to the stencil printing apparatus of the fourth aspect, in the invention of the third aspect, the switching of the switching circuit at the time of execution of the first print control means causes the next input image data to become the stencil printing apparatus. Since the image data of the master wrapped around the cylinder is stored in the page memory other than the page memory storing the image data, when new image data is input, the image data is wrapped around the plate cylinder. It is possible to prevent the image data of the master from being overwritten on the image data of the master, so that the image data of the master wound around the plate cylinder and the new image data correspond to the new image data even though they are the same. It is possible to reliably prevent the occurrence of waste of making a master to be made.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic structure of a stencil printing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control configuration of the stencil printing apparatus.

FIG. 3 is a flowchart illustrating plate making, a printing operation, and the like.

FIG. 4 is a flowchart illustrating plate making, printing operation, and the like in a stencil printing apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 3 master 4 plate making unit 5 plate discharging unit 6 printing paper 29, 30 image data storage unit, page memory 32 switching circuit

Claims (4)

[Claims] 1. A master corresponding to image data input to an image data storage unit is made, and the master made is wound around the outer peripheral surface of a hollow cylindrical plate cylinder, and the plate cylinder is rotated around an axis. In a stencil printing method in which printing is performed by pressing a printing sheet against a master that rotates with the plate cylinder, when new image data is input to the image data storage unit, the new image data and the plate cylinder The image data of the master wound around the outer peripheral surface is compared with the image data already stored in the image data storage unit. If the comparison determines that the two image data are different, the plate Discharge the master wound around the outer peripheral surface of the cylinder, make a master corresponding to the new image data, perform printing by winding the master made on the outer peripheral surface of the plate cylinder, If it is determined by the comparison that the two image data are the same, the master making the master corresponding to the new image data is not performed, and the printing using the master already wound on the outer peripheral surface of the plate cylinder is performed. Stencil printing method, wherein stencil printing is performed again. 2. When the new image data input to the image data storage unit is determined to be the same as the image data of the master wound around the outer peripheral surface of the plate cylinder, It is determined whether or not the number of prints by the master wound around the outer peripheral surface of the plate cylinder is equal to or more than the number of printing endurances. If the number of printings is equal to or more than the number of printing presses, the master wound around the outer peripheral surface of the plate cylinder is discharged to make a master corresponding to new image data, or the number of printings equal to or more than the number of printings 2. The stencil printing method according to claim 1, wherein the notification is made. 3. A plate making section for making a master corresponding to input image data, and a porous cylindrical plate cylinder provided rotatably about an axis and wound around the outer periphery of the master. A plate discharging section for peeling off and discharging the master wound around the outer peripheral surface of the plate cylinder, and pressing the printing paper against the master wound around the outer peripheral surface of the plate cylinder and rotating together with the plate cylinder. In a stencil printing apparatus for performing printing, two page memories for storing input image data for each master sheet, storage means for storing new input image data in one of the page memories, New image data stored in the page memory and image data of a master wound around the outer peripheral surface of the plate cylinder, which is stored in the other page memory. Comparing means for comparing the two image data with each other. If it is determined that the two image data are different from each other, the plate discharging by the plate discharging unit and the master of the master corresponding to the inputted new image data. First printing control means for performing plate making by a plate making unit, winding a master made on the outer peripheral surface of the plate cylinder, and printing using the master wound on the outer peripheral surface of the plate cylinder; A second print control unit that, when it is determined that the two image data are the same based on the comparison result by the unit, performs printing again using the master already wound around the outer peripheral surface of the plate cylinder; A stencil printing apparatus comprising: 4. A switching circuit for switching which page memory stores the input image data is provided, and the switching circuit is used by the first print control unit when the first print control unit is executed. 4. The stencil printing apparatus according to claim 3, wherein switching is performed to store the next input image data in a page memory other than the page memory storing the image data.