JPH04129785A - Rotary type screen printing apparatus - Google Patents

Abstract

PURPOSE:To eliminate the disposal of non-plate making raw paper without using said raw paper in printing by bringing a press roller into contact with a plate cylinder under pressure in such a state that a means suppressing the rotation of the press roller is operated and rotating the plate cylinder a predetermined number of times and subsequently peeling the raw paper up to now from the plate cylinder to mount new raw paper on the plate cylinder and releasing the means suppressing the rotation of the press roller to carry out normal printing. CONSTITUTION:A solenoid 22 is turned ON and a stop pawl 21 is displaced to be engaged with a ratchet wheel 20. By this mechanism, a press roller 6 can not be rotated in a paper feed direction and printing paper 15 is supplied from a resist roller 8 and pressed to a rotating plate cylinder 2 by the press roller 6. The plate cylinder 2 is rotated and ink is supplied to the inner peripheral surface of the plate cylinder by an ink roller 4 and a doctor roller 5 and the opening parts of the support cylinder of the plate cylinder and a mesh screen are filled with the ink. After the plate cylinder is rotated a set number of times, the solenoid 22 is turned OFF and the engagement of the ratchet wheel 20 and a stopper 21 is released and the stopped paper is fed by the plate cylinder and the press roller 6 to be discharged to a peeling and discharge table by a paper discharge pawl 23. New perforated raw paper is mounted by a known means to transfer to trial printing.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a rotary stencil printing apparatus.

In a conventional rotary stencil printing apparatus, generally, as illustrated in FIG. 3, a metal supporting cylinder 2a having numerous holes and a menon screen layer made of, for example, mesh-like polyester fibers attached to the outer periphery of the metal supporting cylinder 2a are used. A perforated stencil paper 1 is held in a cylindrical perforated rigid plate cylinder 2 consisting of a cylinder 2b, and its tip is gripped by a clamper 3 provided on the plate cylinder 2. The ink is supplied to the numerous holes of the supporting cylindrical body 2a from the ink supplying device provided in the screen, and the ink oozes out onto the outer periphery of the screen layer 2b.

The cylindrical plate cylinder 2 with the stencil paper 1 attached to its outer circumferential surface in this manner is supplied with ink to its inner circumferential surface by an ink supply device! - The press roller arm 11 and the press roller support arm 1 are rotated around the shaft 16 by an electric motor, and the stencil paper 1 and the spring 12 are mounted on the circumferential surface of the plate cylinder 2.
The printing paper 15 is sequentially fed between the press roller 6 which is urged toward the outer periphery of the plate cylinder 2 via the press roller 3, and rotates integrally with the plate cylinder 2 in synchronization with the rotation of the cylindrical plate cylinder 2. Under the control of the cam 7, the printing paper 15 is brought into pressure contact with the stencil paper 1 by the press roller 6 and conveyed, and the ink is transferred to the printing paper 15 through the holes in the stencil and the stencil paper 1, thereby performing printing.

The press roller arm 11 is as shown in FIG.

At times other than when printing, the press roller 6, whose lower end is locked by a stopper 10 and is pivotally supported at the tip of a press roller support arm 13 fixed to the spindle of the press roller arm 11, is moved to the plate cylinder 2.
It is held in a separate position. As shown in FIG. 3, the cam 7 has a region corresponding to the non-perforated portion where the stencil paper 1 is not wound around the plate cylinder protruding from the reference circle, and a portion corresponding to the perforation region coincides with the reference circle. ing. When printing, printing paper 1
5 wrapped around a printing cylinder 2 whose tip rotates.
A pair of registration rollers 8 are provided to feed the paper at a timing that coincides with the leading edge of the paper feed path.7 A feeler 9 that senses the paper is located at a position immediately after the pair of registration rollers 8 on the paper feeding path. It is fixed to a shaft, and when the printing paper 15 passes over it during paper feeding, the paper 15 pushes down the feeler 9 as shown in FIG. 4, causing the stopper 10 to rotate counterclockwise in the figure. , the press roller arm 11 is released from the press roller arm 11, and the upper end of the press roller arm is opened so that the cam follower lla faces the reference inner part of the cam 7 with a slight gap, and the press roller arm 11 is pulled by the spring 12. Rotates clockwise around its fulcrum,
The press roller 6 presses the printing paper 15 against the base paper 1 on the plate cylinder 2, and in the non-perforated part of the plate cylinder 2, the cam follower lla engages with the protruding part of the cam 7, and the press cola 6 is moved as shown in FIG. , and when the paper 15 has finished passing through the filler 9, the filler 9 rotates clockwise and the stopper 10 locks the press roller arm 11.

When printing is performed, ink is consumed in the perforated portions of the stencil paper 1, ink is supplied to the screen layer 2b from the holes in the support cylinder 2a, and ink is supplied to the holes in the support cylinder 2a by an ink supply device. .

In the example shown in FIG. 3, the ink supply device includes an ink supply roller 4 that contacts the inner circumferential surface of the plate cylinder 2 at a position facing the press roller 6 and rotates around its own axis in the direction of the arrow; A doctor roller 5 is provided with a slight gap therebetween and rotates around its own axis in directions indicated by arrows in the figure, and a doctor roller 5 rotates by transmitting the rotation of the cylindrical plate cylinder to these rollers 4 and 5. A drum shaft 1 that is formed as a hollow shaft with a gear train and a plurality of holes on the lower surface and also serves as an ink supply pipe.
6.

The V-shaped groove formed by A7 Ki P: Feeding Knee; The ink in the ink reservoir 17 that is being supplied is taken along with the rotation of the ink supply roller 4 and the doctor roller 5, and is metered as it passes through the gap (doctor gamb) between these two rollers.
, an ink film is formed on the outer circumferential surface of the ink supply roller 4, and is carried by the ink supply roller 4 and supplied to the inner circumference of the cylindrical plate cylinder 2.

Now, in a rotary stencil printing device with the above configuration, if it is left unused for a long time after printing, the ink contained in the openings of the plate cylinder and the mesh screen may evaporate, and the ink may be replaced with a new one. When the base paper is wrapped around the plate cylinder and printed, there is not enough ink at the beginning, but the ink gradually fills the plate cylinder cylinder opening and the mesh screen.
Good printed matter cannot be obtained unless several to several tens of sheets are passed. Therefore, if printing paper is passed from the beginning, several to several tens of sheets will be left behind. Furthermore, in order to prevent the occurrence of waste paper, there is a method of separately preparing paper for adjustment and switching over it, but this method has the disadvantage that it is troublesome to replace it with printing paper.

In addition, in Japanese Patent Publication No. 62-30117, after printing is completed,
A stencil printing device has been disclosed in which used base paper is discharged to maintain confidentiality, and non-perforated base paper is wrapped around a plate cylinder to prevent ink from evaporating.
Even with this method, it is impossible to completely seal the ink inside the plate cylinder and the mesh screen, so the ink gradually evaporates and there will be a shortage of ink the next time you print, and the same problem as described above can be avoided. do not have. Another disadvantage is that the running cost is high because the base paper without a plate is discarded without being used for printing.

Problems to be Solved by the Invention The present invention takes into account the above-mentioned drawbacks of conventional rotary stencil printing devices when starting printing with new base paper, and solves the problem of generating a large amount of waste paper and not using unmade base paper for printing. An object of the present invention is to provide a rotary stencil printing device that does not need to be discarded and is useful for reducing running costs.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a rotary stencil printing apparatus having the above-mentioned structure, and provides a means for suppressing the rotation of the press roller when the press roller is pressed against the plate cylinder. When printing a new base paper With the previous base paper attached to the plate cylinder, the rotation of the plate cylinder is started, the printing paper is fed, and the means for suppressing the rotation of the press roller is activated. Pressing the press roller against the plate cylinder, rotating the plate cylinder a predetermined number of times, peeling off the old base paper from the plate cylinder and discarding it, applying a new base paper, and releasing the rotation prevention means of the press roller, A feature of the present invention is that a control means is provided for controlling the normal printing process.

Function Since the configuration is as described above, when printing is performed with a new base paper installed, prior to replacing the base paper, the previous base paper is attached to the plate cylinder and the rotation of the plate cylinder is started and printing paper is fed. At the same time, when the press roller is brought into pressure contact with the plate cylinder with the printing paper sandwiched in the state in which the rotation suppression means of the press roller is activated, the frictional force between the press roller and the printing paper is absorbed by the pressure applied to the plate cylinder. Because it is greater than the frictional force between the base paper and the printing paper,
The paper does not move because the press roller is stopped. When the plate cylinder is rotated a predetermined number of times in this state, the printing paper remains in a stopped state, but as the plate cylinder rotates, ink is replenished to the inner surface of the plate cylinder by the ink supply device, and the apertures of the plate cylinder are refilled with ink. is filled with ink.

After the set number of rotations, the old base paper is peeled off from the plate cylinder and discarded. After the new base paper is applied, the rotation prevention means of the press roller is released and the normal printing process is carried out, so that the ink is removed from the plate cylinder. Since the holes in the cylinder are sufficiently filled, it is possible to obtain a printed product better than a test print.

Embodiments Below, embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to the rotary stencil printing apparatus previously described in FIG. 3. Therefore, members having the same functions as those of the device shown in FIG. 3 are given the same reference numerals, and the explanation will focus on the differences.

In the device of the second embodiment, a ratchet wheel 20 is integrally fixed to the end of the press roller 6, and a stop pawl 21 that can engage with the teeth of this ratchet wheel is attached to the press roller support arm 13. The other end of the retaining portion is a solenoid 2 fixed to the press roller support arm 13.
It is connected to No. 2 Brannya.

Other configurations are the same as those of the conventional device described above with reference to FIGS. 3 and 4.

Now, when a printing command is issued after the power is turned on, the plate cylinder is rotated at low speed by a motor, ink is replenished to a certain amount by an ink detection member (not shown), and a sheet of printing paper 15 is fed by a paper feeding device (not shown), and then the system roller Sent to 8th. The registration roller 8 is driven by a motor, a fan-shaped gear, etc., and is fed at a predetermined timing when the n-plate cylinder 2 and press roller 6 are opened.

Simultaneously with the paper feed command, voltage is applied to the solenoid 22, the solenoid 22 is turned on, and as shown in FIG. 2, the stop pawl 21 is displaced and engaged with the ratchet wheel. As a result, the press roller 6 cannot rotate in the paper feeding direction, and the paper is fed from the resis [roller 8].
Figure 3) The plate cylinder 2 is released and the press roller 6 rotates.
Press the printing paper 15.

The frictional force between the press roller 6 and the printing paper 15 is greater than the frictional force between the printing paper 15 and the base paper wound around the plate cylinder. As the plate cylinder rotates without slipping or moving between the cylinders, the ink roller 4 and the doctor roller 5 replenish the inner peripheral surface of the plate cylinder with ink, and the ink is supplied to the support cylinder opening of the plate cylinder and the mesh screen. 7 is filled with ink.

When the ink is sufficiently filled and the plate cylinder has rotated a set number of times, the solenoid 22 is turned off, the engagement between the swamp wheel 20 and the stopper 21 is released, and the stopped paper is moved between the plate cylinder 2 and the press roller. 6, is peeled off by the paper ejection claw 23, and is ejected onto the paper ejection table. Also, the original paper 1 so far
is peeled off from the plate cylinder 2 by a plate discharging device (not shown) and discarded, and a new perforated base paper is plated by known means, and trial printing is started.

Effects As described above, according to the present invention, even if the paper has been left for a long time after the previous printing, it can be printed continuously in a short time by pressing the original base paper wrapped around the rotating plate cylinder without transporting the paper. The plate cylinder support cylinder and the plate cylinder are
Ink can be filled into the holes in the screen.
It is possible to obtain better printed matter than with a board (test printing). Also, only one sheet of printing paper is used during the filling of the ink into the holes, which is much cheaper than the traditional method, which generates a lot of waste paper and uses unperforated base paper and throws it away. Economical. As a result of experiments, it was possible to obtain printed matter equivalent to continuous use during plate attachment with a standing period of 10 days, a plate cylinder rotation speed of 40+pm, and suppression 5 times.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration near the plate cylinder of a rotary stencil printing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view illustrating the operation of the press roller and related mechanisms, and FIG. FIG. 4 is a sectional view showing the configuration near the plate cylinder of a rotary stencil printing apparatus to which the above is applied, and FIG. 4 is an explanatory diagram illustrating the action of the press roller during printing.・・stencil paper plate cylinder ink roller press roller cam ・registration roller detection feeler ・stopper press roller arm ・spring press roller support arm printing paper ratchet wheel (means to suppress the rotation of the press roller) stopper solenoid 6 ・ 7 ・ 10 ・20 ・QD QD

Claims (1)

[Claims] Perforated stencil paper is wound around the outer periphery of a perforated rigid plate cylinder, and printing paper is pressed by a press roller that can come into contact with and separate from the stencil paper wrapped around the plate cylinder, and the inner peripheral surface of the plate cylinder is pressed. In a rotary stencil printing device that performs printing by transferring ink that is supplied to the plate cylinder and oozes out through holes in the plate cylinder and stencil paper onto the printing paper, when the press roller is pressed against the plate cylinder, the press roller is pressed against the plate cylinder. In addition to providing a means for suppressing rotation, when a new base paper is plated, the rotation of the plate cylinder is started with the previous base paper attached to the plate cylinder, feeding the printing paper, and the rotation of the above-mentioned press roller is started. The press roller is brought into pressure contact with the plate cylinder while the restraining means is activated, and after rotating the plate cylinder a predetermined number of times, the old base paper is peeled off from the plate cylinder and discarded, and a new base paper is applied. 1. A rotary stencil printing apparatus, characterized in that it is provided with a control means for releasing the rotation inhibiting means of the press roller and controlling the normal printing process.