JPH05318905A - Plate making and printing apparatus - Google Patents

Abstract

PURPOSE:To prevent the viscosity of printing ink from becoming high to a certain degree or more in a plate making and printing apparatus. CONSTITUTION:A plate making and printing apparatus is equipped with a plate making means thermally perforating stencil paper 11 by a thermal head 3 to perform plate making, a printing means receiving the supply of the stencil 20 made by the plate making means to wind the same around a plate cylinder 21 and superposing printing paper 23 on the wound stencil 20 and supplying ink 25 from the ink supply member in the plate cylinder 21 to perform printing and a heater 26 for heating the ink supply member of the printing means. The ink supply member is heated if necessary to prevent the viscosity of the ink 25 from becoming high to a certain degree or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-making / printing device capable of thermally perforating a stencil base paper to make a plate, and then printing using the plate.

[0002]

2. Description of the Related Art Japanese word processors and computers have been rapidly spread, and a large number of documents created by various printers have been used. By the way, the dot printer expresses characters such as Chinese characters in dot (pixel) units. Therefore, when trying to express complicated characters such as Japanese in high quality, the number of dots occupied in one page of the document becomes enormous, and the printing speed is the same for some documents except for some expensive printers. It is not possible to support mass production.

For this reason, conventionally, even if two or more copies of one document are required, the printer usually prints out one copy at a time. Then, a method was adopted in which the printed document was used as an original and the missing portion was copied by a copying machine.

However, when such a method is adopted, when a large number of copies are required for one document, there is a drawback that the cost of creating the document becomes expensive due to various expenses required for copying.

Therefore, various low-priced light printing systems have been developed in place of copying machines in preparation for preparing a large number of copies of documents. As one of these methods, there is a method of creating a stencil and using this to enable a large amount of printing.

The iron writing method, the writing method, and the typewriter method have been conventionally used to create a stencil. The iron brush method is
This is a method of placing a stencil base paper that is brazed on a steel file and copying it with a steel brush. The apex of the file and the iron brush rub against each other to form pores in the stencil base paper, and a stencil is created. The writing method is a method of writing with a weakly acidic liquid using a stencil base paper in which a gelatinous liquid is coated on the surface of a porous paper such as a tool. A weakly acidic liquid dissolves the gelatin film, creating a stencil. In the typewriter method, the oily film on the surface of the stencil base paper is removed with a typewriter to create a stencil.

In these conventional stencil making methods, since the person directly carries out the plate making, it takes time,
It was also easy to make a mistake in plate making. Moreover, when a plate-making error occurs, the correction is troublesome. JP-A-53-4
No. 9519 proposes a method of punching a stencil base paper using a protruding heating element such as a soldering iron,
This method also has similar drawbacks.

Several plate making methods have been proposed to eliminate the above drawbacks. First, (1) a plate making method using a wire dot printer is a method in which wire dots are directly pressed on a stencil base paper on a hard rubber roll to perform printing perforation. For this reason, there are drawbacks that not only the noise at the time of printing is noisy, but also the stencil base paper is severely damaged and sufficient printing durability cannot be obtained. Next, (2) it is also proposed to perform plate making with a discharge printer. Since this utilizes a discharge breakdown phenomenon, it has a drawback that ozone is generated by an air discharge and an unpleasant odor is generated. Further, (3) for example, JP-A-56-63449 proposes a plate making method using a laser device. However, this method has the drawbacks that the laser device itself is expensive, high precision is required for the optical system that guides the laser light, its manufacture is difficult, and the device becomes large.

In addition to this, (4) a method of thermally performing plate making by flash exposure has also been proposed. In this method, as described in JP-B-52-4969, an original master plate is superposed on a stencil base paper obtained by laminating a stretched vinyl-based thermoplastic synthetic resin film and a porous support. Then, an electron flash discharge tube filled with xenon gas is used to irradiate a flash of light having a wavelength of 0.7 to 1.5 .mu.m to heat the black portion of the image to perforate the stencil base paper.

However, according to this heat-sensitive copying method, if the ink or the like used for the original original plate has a poor infrared absorption efficiency, the heat generation is not sufficiently performed by the irradiation of the flash light, and the perforation is clearly performed. There was a drawback that it might not exist. Further, if the original original plate or the ink or the like described therein is melted by heating, there is a drawback that the original original plate is damaged to the extent that it cannot be reused by the irradiation of flash light. Of course, the flash is dazzling to the eye, and staring at it constantly has a bad effect on the eye.

Therefore, as means for eliminating these drawbacks, Japanese Patent Laid-Open Publication No. 55-103957 and Japanese Patent Laid-Open Publication No. 58-103957 have been proposed.
Japanese Patent No. 39457 proposes an invention in which a stencil base paper is thermally perforated by a thermal head to make a plate.

FIGS. 10 and 11 are for explaining the principle. The methods shown in these drawings are common in that the stencil 1 and the transfer sheet 2 are superposed and passed between the thermal head 3 and the platen roll 4 to perform perforation. Of these, in FIG. 10, the porous sheet 1A side of the stencil 1 is placed on the heating resistor 3A of the thermal head 3.
And the portion 1B1 of the thermal transfer layer 1B to which the heat pulse is supplied is transferred onto the transfer sheet 2. In FIG. 11, on the contrary, the transfer sheet 2 is brought into contact with the heating resistor 3R and the thermal transfer layer 1B is heated from the transfer sheet 2 side to transfer the heated portion 1B1 of the thermal transfer layer 1B.

As described above, in both of the methods shown in these figures, the contact between the heating resistor 3R and the thermal transfer layer 1B is avoided.
This is to avoid a decrease in printing ability caused by the thermal transfer material adhering to the thermal head 3. The adhesion of the thermal transfer material to the thermal head 3 is recovered to some extent by head cleaning. However, as the cleaning is repeated several times, the thermal transfer material permeates even into minute cracks and pinholes on the surface of the protective film of the heating resistor 3, and the thermal head 3 has to be replaced. In order to avoid such a state, the porous sheet 1A
Alternatively, the transfer sheet 2 is placed in contact with the heating resistor 3R. However, for this reason, most of the heat pulse output from the thermal head 3 is reflected or absorbed on the way.

In order to cover these thermal losses,
Conventionally, a method of increasing the energy level of the heat pulse output from the thermal head 3 has been adopted. As such a method, there is a method of increasing the time width of the applied pulse supplied to the thermal head 3 and a method of increasing the applied voltage.

However, the former method has a drawback that the plate-making speed is reduced by the extension of the applied pulse. In the latter method, the thermal head 3 is applied by applying a high voltage.
There was a problem that the life of the product was shortened. Further, the stencil produced by these methods must be manually set on the printing machine by the operator, which not only requires skill to perform the work, but also has a drawback that the hand becomes dirty.

In order to eliminate these drawbacks, a plate-making / printing device has been developed which is capable of making a plate with a relatively small amount of heat energy and then printing. In this developed plate making / printing device, a stencil base paper on which a stretched thermoplastic resin film is formed on a porous support is used, and the stretched thermoplastic resin film is directly contacted with a thermal head to perform plate making, and then The stencil obtained by this is wound around the plate cylinder for printing.

This plate-making / printing device was developed on the basis of the new fact that even if the stretched thermoplastic resin film is brought into direct contact with the thermal head, it does not adhere to the thermal head under predetermined conditions. is there. Therefore, plate making is possible with a relatively small amount of heat energy, and printing is performed after plate making, so that anyone can easily obtain a printed matter.

[0018]

By the way, as is the case with the developed plate-making / printing apparatus, even in the conventional stencil printing machine using a plate cylinder, the printing paper is superposed on the stencil wound around the plate cylinder. In addition, printing is performed by supplying ink from the ink supply member inside the plate cylinder. When such a device is used at room temperature, there is no problem. However, at low temperatures, for example, when the room temperature is 10 ° C or lower in winter, the viscosity of the ink becomes high and the fluidity deteriorates. It sometimes solidified. When the fluidity of the ink is lowered, there is a problem in that the perforated portion of the stencil is poorly passed, the printing density is lowered and an image is missing. When the ink is solidified on the surface of the plate cylinder, not only the print quality is deteriorated, but also the stencil adheres to the surface of the plate cylinder through the stencil and may be damaged when peeled off. there were. Further, there is a problem that the ink corresponding to the perforation pattern of the stencil is solidified and remains on the surface of the plate cylinder, which adversely affects the next printing. In particular, in the platemaking / printing apparatus developed earlier, the stencil is automatically peeled off, so that if a peeling error occurs, the subsequent processing is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plate-making / printing device capable of preventing the viscosity of printing ink from increasing to a certain extent or higher.

[0020]

According to a first aspect of the present invention, the plate making / printing apparatus is equipped with a heating means for heating the ink supply member in the plate cylinder, and the ink supply member is heated as necessary. In this way, the viscosity of the ink is kept below a certain level.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples.

In this embodiment, first, the preparation of a stencil will be described, and then the printing using this stencil will be described.

Creating a stencil

FIG. 1 is for explaining the principle of forming a stencil in this embodiment. Porous sheet 11A
The stencil base paper 11 on which the stretched thermoplastic resin film 11B is formed is supplied to the thermal head 3 so that the stretched thermoplastic resin film 11B contacts the heating resistor 3R.

Here, the stretched thermoplastic resin film 11B is made of, for example, vinylidene chloride copolymer resin, polyvinyl chloride and vinyl chloride copolymer resin, polyethylene terephthalate, polypropylene, polyethylene, or polyethylene and ethylene vinyl acetate copolymer. It is a layer having a thickness of 5 to 250 μm in which a synthetic resin such as coalesced is stretched at least twice by an inflation method or a biaxial stretching method. The porous sheet 11A is made of, for example, Tetoron, nylon, silk,
Gauze made of fibers such as rayon and cotton, glass fiber,
It is made of porous sheets with a relatively high melting point, such as asbestos and non-woven fabrics made of natural or artificial fibers. For bonding the stretched thermoplastic resin film 11B and the porous sheet 11A, a thermoplastic synthetic resin solution such as a vinyl acetate-based copolymer, a vinyl chloride-based copolymer, or a vinylidene chloride-based copolymer is generally used as an adhesive agent. What is used is used. Further, the thermal head 3 uses a heating resistor 3R in which a large number of heating elements are arranged in a direction (main scanning direction) perpendicular to the rotation direction (sub-scanning direction) indicated by the arrow in the platen roll 4. ..

Image data 13 for driving is supplied to the thermal head 3 from a thermal head drive circuit 12 as shown in FIG. This image data 1
3 is the original image data 15 output from the image information source 14 processed to be suitable for plate making. For example, if the thermal head 3 is a so-called alternating lead connection type thick film type head, one elongated heating resistor is divided into two groups and divided driving is performed, so that the image data 15 is divided into two pixels by two pixels. Image data for driving 13 reorganized every other time
Becomes Even when halftones are reproduced by the dither method or the like, signal processing is required to create a dot pattern corresponding to each gradation. As the image information source 14, for example, an electronic device such as a document reading device using a raster input scanner (RIS) or a word processor is used.

A timing control signal 16 is output from the thermal head drive circuit 12 in synchronism with the transmission of the drive image data 13, and is supplied to the base paper transport mechanism 17. The base paper transport mechanism 17 is composed of a motor for driving the pressure roll 4, a drive circuit for the motor, and the like. The stencil base paper 11 is sub-scanned by a predetermined amount each time the punching of image data for one line is completed. There is. When the perforation of all lines is completed in this way, the plate making of the stencil base paper 11 is completed, and the stencil is created.

In this example, the plate making conditions were set as follows.

[Plate making conditions]

Stencil base paper: A polyester screen base on which a vinylidene chloride copolymer resin is formed as a stretched plastic resin film. Base paper size is A4.

Thermal head: 8 dots / manufactured by ROHM
mm head. The model number is KH 106-6.

Heating condition: 1 m with a heat quantity of 1 watt / dot
sec.

Platen roll pressure: 0.25 kg / c
m.

Plate making speed: 10.5 msec / line.

Under the above conditions, 1000 plates were continuously made without cleaning the thermal head 3. Then, the stencil for the first sheet and the stencil for the 1,000th sheet were extracted, and printing was performed by applying them to Horii Rotary 1000 manufactured by Horii Kasakudo to make the quality of these stencils objective. As a result, an average print density D _AVE of 1.4 was obtained, and the print density difference ΔD between both stencils could be suppressed to 0.1, and good printed matter could be obtained.

In order to confirm the effect of this embodiment,
The following conditions for comparison were set.

[Comparison condition: 1]

Platen roll pressure: 0.5 kg / c
m.

Other plate-making conditions are the same as the previous conditions.

Under this plate-making condition, continuous stencil sheets of 1000 sheets were prepared without cleaning the thermal head 3, and the same printing was performed on the first sheet and the 1000th sheet. As a result, the average print density D _AVE is almost 1.
4 was obtained, but the print density difference ΔD expanded to 0.25 or more. That is, the vinylidene chloride copolymer resin adhered to the thermal head 3 during the thermal perforation, and the deterioration of the plate making proceeded, and it was not possible to make good plate making with the 1000th stencil.

After the completion of the plate making of the 1000th sheet, the thermal head 3 was cleaned with a waste cloth containing glycerin, and 10
I made the 01st stencil, but the thermal head 3
Could not be regenerated sufficiently, and good plate making could not be performed.

[Comparison condition: 2]

The heating conditions were the same as the plate making conditions described above, and the porous sheet 11A side of the stencil base paper of the same construction was brought into contact with the thermal head 3 for punching. When the stencil obtained in this way was applied to a Holly rotary 1000 and printed, no image was printed. This is because no thermal energy was applied due to insufficient applied energy.

FIGS. 3 and 4 show the results obtained by setting various plate making conditions in order to find the conditions under which the plate making can be stably performed for a long period of time. Of these, FIG. 3 shows the case where the platen roll pressure is changed, and the comparative condition example shown above is also a part of this. FIG. 4 shows the case where the plate making speed is changed. In these figures, the symbol D _AVE indicates the average print density by the stencil of the 1st sheet and the 1000th sheet when platemaking is performed continuously on 1000 sheets, and the symbol ΔD is the stencil of the 1st sheet and the 1000th sheet. It is the difference in printing density.
Further, the broken line S is a tentative border line indicating the boundary of the quality of the printed matter, and thus the upper side is generally good.

From the above comparison, it can be seen that the plate making conditions described above are good conditions for making a stencil.

Printing

The stencil thus created is automatically wound around the plate cylinder, and printing is performed on the printing paper.

FIG. 5 shows this principle. A stencil 20 obtained by perforating a stencil base paper is such that the porous sheet 11A side is in contact with the mesh portion of a cylindrical plate cylinder 21. Is wrapped around. An inking roll 22 is applied from the plate cylinder 21 to the porous sheet 11.
Ink is supplied from. The supplied ink is held in the perforated portions of the porous sheet 11 and the stretched thermoplastic resin film 11B. Therefore, if the printing paper 23 passes between the plate cylinder 21 and the pressure roll 24 in the direction of arrow D while the plate cylinder 21 is rotating in the direction of arrow C,
The ink 25 is transferred from the punched portion to the printing paper 23, and printing is performed.

The inking roll 22 has a structure in which a rubber layer 22B made of silicon rubber or the like is provided on the outer peripheral surface of a pipe 22A made of a metal such as aluminum having a good thermal conductivity. Inside the pipe 22A, a heater 26 including a quartz lamp or a heater using a nichrome wire is provided. The heater 26 is projected from both ends of the inking roll 22,
While 2 is rotatable in the direction of the arrow, it is fixedly arranged.

The temperature of the surface of the inking roll 22 or the vicinity thereof is detected by a temperature sensor (not shown). When the temperature detected by the temperature sensor is, for example, 10 ° C. or lower, the heater 26 is energized to generate heat, and the temperature is higher than 10 ° C.
When the temperature rises above 5 ° C, heat generation is stopped. Therefore, when the temperature of the surface of the inking roll 22 or its vicinity is 10 ° C. or less, the heater 26 generates heat and the viscosity of the ink adhering to the surface of the inking roll 22 or its vicinity is below a certain level. Kept in. Further, since the inking roll 22 is in rolling contact with the inner peripheral surface of the plate cylinder 21, the heat of the former is conducted to the latter. Therefore, when the inking roll 22 is heated, the plate cylinder 21 is also heated, and the ink adhering thereto is also heated.
Therefore, the viscosity of the ink adhering to the plate cylinder 21 is also kept below a certain level. At this time, the plate cylinder 21 is heated evenly, so that the plate cylinder 21 is idled several tens of times. The diameter of the inking roll 22 is about 30 mm, the pipe 22A and the rubber layer 22B are made of aluminum and silicon rubber, respectively, and the heater 26 is a quartz lamp (100 V,
When 100 W) was used, the temperature of the surface of the inking roll 22 could be about 30 ± 3 ° C.

Specific example

Next, a specific example of the plate-making / printing apparatus of this embodiment will be described.

FIG. 6 shows an outline of the plate making / printing apparatus. This device includes a plate making unit 2 in the device body 27.
8 and the printing unit 29 are accommodated. The plate making unit 28 has a supply paper tube 31 formed by winding a long stencil base paper 11 in a roll shape.
Are arranged. The two sets of conveying roll pairs 32 and 33 feed and convey the stencil base paper 11, and a cutter 34 for cutting the stencil base paper 11 into a predetermined length is arranged between them. Transport roll pair 33
The stencil base paper 11 conveyed by is passed between the thermal head 3 and the platen roll 4 for plate making, and the stencil 20 is created. The stencil 20 is sent to the printing unit 29 by the other two pairs of transport rolls 36 and 37.

In the printing section 29, when the stencil 20 is detected by the sensor 38 arranged near the plate cylinder 21,
The tip of the gripper 39 attached to the plate cylinder 21 is gripped and wound around the plate cylinder 21. When the winding is completed, ink is supplied to the stencil 20 from the inking roll 22 connected to the ink supply pipe 41, and printing is performed. At this time, the printing paper 23 is sent out one by one from the openable / closable paper supply tray 43 by a feed roll 44, and after registration adjustment (adjustment of conveyance timing) is performed by a registration roll 45,
It is supplied between the plate cylinder 21 and the pressure roll 24. The printing paper on which printing has been completed is discharged to the openable / closable paper discharge tray 47 by a conveyor belt 46 of, for example, an air suction method or an electrostatic suction method. Device body 27
Sensors 48 and 49 for detecting the open / closed state of both the paper supply tray 43 and the paper discharge tray 47 are arranged in the printer.

FIG. 7 shows an essential part of an electric circuit of the plate making / printing apparatus. This device is equipped with a CPU (Central Processing Unit) 51 and is connected to each unit through a bus line 52 such as a data bus. Of these, ROM
Reference numeral 53 is a read only memory in which a program for performing circuit control is written. The RAM 54 is a random access memory that temporarily stores image data 55 for plate making and temporarily stores processed data. Keyboard 56, plate making button 57 and display device 5
8 is arranged on an operation panel (not shown) arranged on the upper surface of the apparatus main body 27 (FIG. 6). Of these, the display device 58 driven by the display driver 61 includes a plate-making ready lamp 62, a plate-making lamp 63, and a printing lamp 64.
It is composed of a lamp of a kind and a pattern display device 65 for displaying the set number and the like in a dot pattern.

The image signal input section 67 receives image information 68 from an external device such as a word processor, and converts it into image data 55 suitable for this device. Depending on the device, it is also possible to input code information instead of the video signal and convert it into a predetermined video signal by the character pattern generator. The sensor input unit 69 is the sensor 3 shown in FIG.
It is a port for inputting detection data 71 such as 8, 47, 48 and transferring it to the bus line 52. The solenoid 73 is for raising the thermal head 3 by several mm, and is driven by a solenoid driver 74.
This operation is performed when the stencil base paper 11 is set between the thermal head 3 and the platen roll 4. The thermal head 3 is driven by the head driver 75. A plate-making motor 77 driven by a motor driver 76 is used as a power source for the plate-making unit 28, and a printing motor 79 driven by another motor driver 78 is used as a power source for the printing unit 29. The gripper 39 is driven by a stencil driver 81 for attaching and detaching the stencil, and attaches the stencil 20 to the plate cylinder 21. The stencil driver 81 also drives the releaser 82 so that the stencil 2 after printing is completed.
The leading end portion of 0 is peeled off from the plate cylinder 21. The temperature sensor 83 detects the temperature of the surface of the inking roll 22 or the vicinity thereof, and sends detection data 84 to the bus line 52. The heater 26 for heating the inking roll 22 is driven by the heater driver 85.

The operation of the plate-making / printing apparatus having such a configuration will be described with reference to FIG.

When a power switch (not shown) attached to the apparatus main body 27 is turned on, the plate-making / printing apparatus is turned on, and if all the plate-making start conditions are satisfied (step S101; Y), the plate-making ready lamp. 62 is turned on (step S102). Here, the plate-making start conditions are as follows.

(A) The paper supply tray 44 and the paper discharge tray 47 are both set.

This is the detection data 71 of the sensors 48, 49.
It can be judged by taking the logical product of.

(B) Printing paper 23, stencil base paper 1
1. The required amount of printing ink is present.

This is detection data 71 of a sensor (not shown).
It is judged using.

(C) Image data for plate making has been received.

(D) No paper jam in the device has occurred.

This is performed by checking whether or not the jam data representing the paper jam condition is written in the nonvolatile area of the RAM 54. This jam data is saved unless the jam removal work is performed.

If any of the above conditions is incomplete, its contents are displayed on the pattern display 65. This allows the operator to align the conditions for starting plate making.

Now, when the plate-making ready lamp 62 lights up,
The operator presses the plate making button 57 (step S10
3; Y) Plate making can be started. By the way, when the temperature of the surface of the inking roll 22 or the vicinity thereof is as low as 10 ° C. or lower with the plate making button 57 being pressed, problems such as deterioration of print quality occur as already described. Therefore, in this plate making / printing device,
When the plate making button 57 is pressed, the temperature of the surface of the inking roll 22 or the vicinity thereof is detected by the temperature sensor 83,
When the temperature is 10 ° C or lower, the heater 26 is caused to generate heat.

FIG. 9 shows the operation of the heater 26 for printing preparation. When the plate making button 57 is pressed (step S103; Y), the CPU 51 causes the temperature sensor 8 to operate.
It is determined whether or not the temperature T detected in 3 is lower than a predetermined reference temperature T ₀ (step S131). Here, the reference temperature T ₀ refers to a temperature at which the viscosity of the printing ink becomes higher than a certain level and the print quality is adversely affected. This reference temperature T ₀ can be set in the apparatus, for example, by inputting a numerical value from the keyboard 56 while simultaneously pressing the plate making button 57 and a stop button (not shown).

When the temperature T detected by the temperature sensor 83 is equal to or lower than the reference temperature T ₀ (step S131;
Y), the heater 26 is turned on (step S132),
At this point, the plate cylinder 21 starts to spin (step S133). When the temperature T detected by the temperature sensor 83 is equal to or higher than the reference temperature T ₀ (step S131;
N), the heater 26 is kept off, and the plate cylinder 2
No idling of 1. When the heater 26 is turned on and the plate cylinder 21 starts idling, the CPU 51 determines that the temperature T detected by the temperature sensor 83 is higher than another reference temperature T ₀₀ (somewhat higher than the previous reference temperature T _0). 25 ° C for example)
It is determined whether or not it is higher than (step S13).
4). When the temperature becomes higher (Y), the heater 26 is turned off (step S135), and the plate cylinder 21 is stopped (step S136) after a certain time (for example, 5 seconds) has elapsed from this point. The delay of the stop of the plate cylinder 21 in this manner allows the heat of the inking roll 22 to be more sufficiently transferred.
This is for conducting to 1.

Returning to FIG. 8, the description will be continued. Plate making button 5
When 7 is pressed, the plate-making lamp 63 lights up (step S
104), the solenoid 73 is excited immediately or when the heater 26 is turned on and then turned off again (step S105). Along with this, the tip position of the cutter 3
4 of the stencil base paper 11 at the position 4
The conveyance is started by 2 (step S106), and the tip portion passes through the gap between the thermal head 3 and the platen roll 4. As a result, the front end portion of the stencil base paper 11 is detected by a setting sensor (not shown) arranged near the thermal head 3 (step S107;
Y). At the same time, the CPU 51 causes the solenoid driver 74
To send the control data to demagnetize the solenoid 73 (step S108). In this way, the stencil base paper 11 is pressed between the thermal head 3 and the platen roll 4, and the setting is completed.

When the setting of the stencil base paper 11 is performed, the image data is supplied to the head driver 75, and the punching operation by the thermal head 3 is started (step S109). In this punching work, the plate making motor 7
7 is intermittently driven every time recording of one line is completed, and the stencil base paper 11 is sub-scanned. Further, in relation to the image data, the cutter 34 is activated when the trailing edge of one page for plate making slightly passes the cutter 34, and the stencil base paper 1
The cutting of 1 is performed.

When this punching operation progresses and the tip of the punched stencil base paper 11 (stencil 20) is detected by the sensor 38, the CPU 51 starts the predetermined distance L1.
Only when the sub-scan is performed (step S110; Y)
The gripper 39 is operated. This causes the gripper 39 to grip the tip of the stencil 20 (step S11).
1). The distance L1 can be calculated by counting the number of lines that have been punched. After that, the rotation of the plate cylinder 21 is started by the control of the printing motor 79 (step S112), and the stencil 20 is wound around the plate cylinder 21 together with the progress of plate making.

When the plate making by the thermal head 3 is completed (step S113; Y), the plate making lamp 63 is turned off (step S114). From this point, the CPU 51 measures the movement distance L2 in the sub-scanning direction (step S1).
15) Determine whether the winding of the stencil 20 around the plate cylinder 21 has ended. When the stencil 20 is wound around the plate cylinder 21, the printing lamp 64 is turned on (step S116),
Printing is started (step S117). Printing is performed by the number of prints set in advance, which is input from the keyboard 56. The set print number is displayed on the pattern display portion 65. When the printing paper 23 runs out during printing or when a situation in which printing cannot be continued occurs, the CPU 51 controls the drive of the display driver 61 according to the content and displays the content of the trouble on the pattern display 65. Let In addition, depending on the device, if a small number of prints, for example, about 5, is set as the print setting number, the pattern display 6 displays a warning display for canceling the pressing of the plate making button 57.
5 may be displayed. This is because, as already explained, if a hard copy exists, it is more economical to make a document by copying it with a copying machine.

When printing of the set number of sheets is completed (step S
118; Y), and the printing lamp 64 is turned off (step S
119), and the releaser 82 operates (step S12).
0). The releaser 82 operates so as to push the leading end portion of the stencil 20 upward from the inside of the plate cylinder 21 to separate this portion from the plate cylinder 21. The peeled leading end portion rides on the claw 86 as the plate cylinder 21 rotates (step S121), and is caught by the peeling roll 87. As a result, the stencil 20 is peeled off from the plate cylinder 21 as the peeling roll 87 rotates, and is discarded in the waste case 88. When the disposal is completed (step S122; Y), the rotation of the peeling roll 87 is stopped and the printing lamp 64 is turned off (step S123). The rotation control of the peeling roll 87 is performed by on / off control of a clutch (not shown) that transmits the driving force of the printing motor 79.

In this way, all operations from plate making to printing are completed. If the next image information is received during this printing operation, the plate-making ready lamp 62 is turned on again (step S102), and the next plate-making and printing operation can be started.

According to the plate making / printing apparatus described above,
Since a stencil is created by directly applying a heat pulse from the stretched thermoplastic resin film side of the stencil base paper with a thermal head, there is no heat diffusion, and the plate can be sharpened accordingly. It is economical because it does not require a transfer sheet. Furthermore, since the stencil and the printed matter are created as a series of operations, there is an advantage that there is no risk of loss or damage due to storage of the stencil.

In the above embodiment, the thermal head is brought into direct contact with the stretched thermoplastic resin film of the stencil base paper to perform plate making, but the present invention is not limited to this. Plate making may be carried out by bringing a porous sheet of stencil base paper into contact with a thermal head, or plate making may be carried out using a transfer sheet.

[0078]

As described above, according to the present invention, since the ink supply member is heated as needed, the viscosity of the printing ink can be kept below a certain level. Therefore, the print quality does not deteriorate due to the decrease in the ambient temperature, the ink attached to the plate cylinder does not solidify, and the stencil is smoothly peeled from the plate cylinder.
It does not adversely affect the next printing.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a principle of creating a stencil according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an apparatus portion required for plate making work in the present embodiment.

FIG. 3 is a characteristic diagram showing printing characteristics when the pressure of the platen roll is changed in this embodiment.

FIG. 4 is a characteristic diagram showing printing characteristics when the plate making speed is changed in this embodiment.

FIG. 5 is a principle diagram showing a principle of printing with a stencil in the present embodiment.

FIG. 6 is a schematic configuration diagram of a plate-making / printing device shown as a specific example in the present embodiment.

FIG. 7 is a block diagram showing a main part of a circuit configuration of the device of this embodiment.

FIG. 8 is a flowchart showing the operation of the apparatus of this embodiment.

FIG. 9 is a flowchart showing the operation of the heater and the like of the apparatus of this embodiment.

FIG. 10 is a principle diagram showing a principle of perforation when heating is performed from the side of a conventional porous sheet.

FIG. 11 is a principle diagram showing the principle of perforation when heating is performed from the ink transfer sheet side in the related art.

[Explanation of symbols]

3 ... Thermal head, 11 ... Stencil base paper, 11A ...
Porous sheet, 11B ... Stretched thermoplastic resin film, 20 ... Stencil, 21 ... Plate cylinder, 22 ... Inking roll, 23
... printing paper, 25 ... ink, 26 ... heater.

Claims (1)

[Claims] 1. A stencil base paper is thermally perforated by a thermal head for plate making, and a stencil produced by the plate making means is supplied and wound around a plate cylinder, and a printing paper is wrapped around the wrapped stencil. Plate-making / printing characterized by comprising: a printing unit that superimposes a plurality of the printing units and supplies ink from an ink supply member in the plate cylinder to perform printing; and a heating unit that heats the ink supply member of the printing unit. apparatus.