JPS63158285A - Stencil duplicator - Google Patents

Abstract

PURPOSE:To obtain printings with clear pictures from the first paper at any time after the ending of plate processing by a method in which the plate process is continuously made two times before going into the printing process. CONSTITUTION:When the tip of a base paper 2 made up by a reading device 10 and a writing device 20 is sent into the opened clamp in waiting of a plate cylinder 1 and clamped, the cylinder 1 is slowly turned in conformity with the sending speed of the paper 2. When the paper 2 comes to a fixed length, the paper 2 is cut off by a cutter 24 and wound around the cylinder 1 turning at low speeds. A paper 38 for printing is pressed on the paper 2 wound around the cylinder 1 by a press roller 40 and sent out at low speeds for place processing. When a switch 51 is set in such a way that the plate process is made two times, before going into printing process after the ending of the plate processing, plate process is made one more time. When two time's continuous plate process is made, very great effect is obtained for the supplying rise of ink to the paper 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a stencil printing apparatus, and particularly to a stencil printing apparatus that can carry out the printing process twice in succession before entering the printing process.

(2) Prior Art In a stencil printing apparatus having a cylindrical plate cylinder, the stencil printing base paper made by the plate making apparatus is automatically or manually clamped at its leading end and wound around the outer peripheral surface of the plate cylinder. By slowly rotating the printing cylinder at a low speed while pressing a press roller against the outer peripheral surface of the printing cylinder through the printing paper, the base paper is brought into close contact with the outer peripheral surface of the first printing cylinder. A process called so-called printing is performed.

This ensures the adhesion of the base paper to the outer circumferential surface of the plate cylinder, and at the same time enables the rapid supply of a large amount of ink to the back side of the base paper, allowing the ink to become familiar with the base paper, which is used for the first time in the subsequent printing process. The main purpose of this process is to obtain prints with clear images from the first page.

However, even in the above-mentioned printing process, when printing is performed at low temperatures or after being left for a long period of time, the ink becomes hard and fluidity of the ink decreases, and the ink on the outside surface of the plate cylinder may become hard. If the paper has become slightly dry, even if you perform normal plate printing, you will not be able to obtain a print with a clear image in the next printing process. I was in a situation where I had no choice but to throw away the first few to several dozen prints because they didn't produce satisfactory images, and then print extra copies.

(3) Purpose This invention was devised in view of the conventional situation as described above. The purpose is to provide

(4) Structure In order to achieve the above-mentioned object, the present invention includes a switch that can set the number of steps for one plate printing to two times in the stencil printing apparatus as described above, and a switch that can set the number of steps for one plate printing to two times. The present invention is characterized in that it includes a control member for controlling the printing apparatus so that when the printing process is set twice, the printing process is carried out twice in succession before the printing process starts.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of an integrated thermal plate printing apparatus.

In the figure, 1 is a cylindrical plate cylinder, and the plate cylinder 1 is composed of, for example, a metal cylinder with a porous structure and a laminated body of screen mesh wrapped around its outer circumference. A clamp 3 is provided for selectively locking the leading end of the stencil printing base paper 2 that has been made. An ink supply device 7 having an ink supply roller 4, a doctor roller 5, and an ink reservoir 6 is provided inside the plate cylinder 1, and ink is automatically supplied to the ink reservoir 6 from an ink container (not shown). ing.

10 is a plate reading device, and document feed rollers 11 and 12.
, fluorescent lamp 13, reflective mirror 14, lens unit 15,
When the document 17, which is equipped with a CCD sensor 16 and the like and is fed at a constant speed by the feed rollers 11.12, reaches the reading position (exposure section), the light emitted from the fluorescent lamp 13 is transferred to the mirror 14. The image of the manuscript 17 is read by being captured by a CCD sensor 16 via a lens unit 15, and this is converted into an electrical signal and sent to a control device 18 shown in FIG. 3.

20 is a plate making writing device, and a base paper roll 21 for stencil printing.
．． Thermal head 22, platen roller 23. It has a base paper cutting cutter 24, a plate feeding roller 25, etc., and when the base paper 2 pulled out from the base paper roll 21 is sent at a constant speed while the film surface is pressed against the heating element part of the thermal head 22 by the platen roller 23, The heating element of the thermal head 22 generates heat in response to an electric signal from the control device 18 to continuously melt and perforate images on the base paper 2. When the base paper 2 made in this way reaches a predetermined length, it is cut by a cutter. It is designed to be cut at 24.

28 is a plate discharge device, which includes a plate discharge fixing roller 29. Plate discharge movable roller 30. It has belts 31, 32 for transporting the discharged masters, a discharged master storage box 33', etc., and when discharging the masters, the movable roller 30 is rotated in the direction of the arrow by a drive device (not shown).
scoops up the rear end of the base paper 2 wrapped around the outer circumferential surface of the plate cylinder 1, which is pressed against the outer circumferential surface of the printing cylinder 1 and rotates slowly in reverse at a low speed, and peels it off while being bitten between it and the fixed roller 29;
Furthermore, it is fed into the box 33 by means of feed belts 31, 32.

Reference numeral 35 denotes a paper feed device, which includes a paper feed tray 36, paper feed rollers 37, etc., and feeds printing sheets 38 stacked on the paper feed tray 36 one sheet at a time, starting from the top one, with the paper feed rollers 37 and registration rollers. 3
As a result, the printing paper 38 fed one by one is further timed to rotate with the plate cylinder 1 by a registration roller 39, and
and the press roller 40. Press roller 4
0 is urged by a spring (not shown) so as to be pressed against the outer peripheral surface of the plate cylinder 1, so that the printing paper 38 is conveyed while being pressed against the base paper 2 wrapped around the outer peripheral surface of the plate cylinder 1. At this time, an image is printed on the printing paper 38 using ink from the ink supply device 7.

Reference numeral 43 denotes a paper ejection device, which includes a paper ejection claw 44, a suction unit 45, a paper ejection table 46, and the like. The printing paper 3 is conveyed while being pressed against the base paper 2 as described above.
8 from the tip with the paper claw 44, and attach it to the suction fan 47.
While adsorbing the paper, it is sent to a paper discharge table 46 by a conveyor belt 48.

FIG. 2 shows a part of the operation panel of the printing apparatus, and the operation panel 50 is provided with a changeover switch 51 for setting the number of printing steps to one or two. switch 51
If it is switched to 1 in the figure, for example, 1 will be in the OFF state and the number of printing steps will be set to 1, and if it is switched to 2, it will be in the ON state and the number of printing steps will be set to 1. The number of times is set to two.

Next, the operation of the embodiment described above will be explained, but since the overall operation is the same as the conventional one, the explanation below will mainly focus on the printing process.

Reading device 10. When the leading end of the base paper 2 that has been made into a plate by the writing device 20 is fed into the open and waiting clamp 3 of the plate cylinder 1 and locked therein, the first plate cylinder 1 slowly moves at a low speed in accordance with the feeding speed of the base paper 2. It is rotated by When the base paper 2 reaches a certain length, it is cut by the cutter 24, and the cut base paper 2 is then wound around the outer peripheral surface of the plate cylinder 1, which continues to rotate at a low speed. After that, only one sheet of printing paper 38 on the paper feed tray 36 is fed by the paper feed roller 37,
The rotation timing with respect to the plate cylinder 1 is determined by the registration roller 39, and the plate is sent between the first plate cylinder 1 and the press roller 40. Then, this printing paper 38 is transferred to a press roller 40
The printing plate is fed at a low speed while being pressed against the base paper 2 wrapped around the outer circumferential surface of the printing cylinder 1, and one printing is performed.

After the printing process is completed, the printing process starts from the primary stage, and each time the printing paper 38 on the paper feed tray 36 is fed one by one by the paper feed roller 37, the printing paper 38 is filled with ink from the plate cylinder 1. An image is printed with the ink of the supply device 7.

The above is a case where the changeover switch 51 is set so that the number of printing steps is one.

The changeover switch 51 is set so that the number of printing steps is two.
is set, after the printing process is completed, printing is performed one more time before starting the printing process. Namely.

In this case, after the first printing is completed, the controller 1
As shown in FIG. 3, a drive signal is output from 8 to the plate M drive command circuit, paper feeding operation command circuit, printing pressure operation command circuit, and paper ejection operation command circuit, and the first printing is performed by the plate cylinder 1.8 as a device. Paper feeding device 35, registration roller 39, press roller 40. By driving the paper discharge roller 43, another sheet of printing paper 38 is sent between the plate cylinder l and the press roller 40, and is pressed against the base paper 2 on the outer peripheral surface of the plate cylinder 1 by the press roller 40. It is sent at low speed in a state where it is In this way, the second edition is performed. After the second printing process is completed, the printing process begins as before.

In the above, the printing speed of the printing device is usually 40 to 120
On the other hand, in the process of plate printing, the slower the speed as possible, the greater the effect of the ink blending into the base paper 2. Therefore, the rotational speed of the plate cylinder 1 during one plate printing is, for example, 10 to 10.
The speed is selected from 20 sheets/minute. As a result of experiments, it has been found that if plate printing at a rate of 10 to 20 sheets/minute is performed twice in succession as described above, there is a very large effect on the start-up of ink supply to the base paper 2.

(5) Effects As mentioned above, this invention allows the printing process to be performed twice consecutively if necessary, so even if the ink is hard at low temperatures, the printed image will not stand up well. Even if the ink on the plate cylinder is slightly dry after being left for a long time, you may have to perform a number of wasteful test prints as in the conventional method, or print several dozen prints from the first few pages. There is no need to throw away the paper, and plate printing has the excellent effect of allowing you to obtain a print with a clear image from the first sheet at any time after the process is completed.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is a schematic partial view showing a part of the same operation panel, and FIG. 3 is a control block diagram. 1... Plate cylinder 2... Base paper 3... Clamp 7... Ink supply device 1'o... Plate making reading device 11... Plate making writing device 38... Printing paper 40... Press roller 5
1... Selector switch: :,-,,,,l.

Claims (1)

[Claims] 1. After wrapping the plate-made base paper around the outer peripheral surface of a cylindrical plate cylinder by locking its tip end, the plate cylinder is rotated at low speed while applying printing pressure with a press roller through a sheet of printing paper, In a stencil printing device in which the plate-setting step of bringing the base paper into close contact with the outer circumferential surface of the plate cylinder can be performed once before entering the printing process by a plate-setting device, the number of times of the plate-setting process is increased to two times. a settable switch; and a control member for controlling the printing device so that when the switch sets the number of printing steps to be two, the printing step is performed twice consecutively before entering the printing step; A stencil printing device characterized by comprising: