JPH0436914Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to, for example, a direct-blade type offset printing machine, and particularly relates to a device for supplying dampening water to a plate wrapped around a plate cylinder, and a device for supplying dampening water to a plate wrapped around a plate cylinder. The present invention relates to a two-liquid common supply device that is used in common with a device for supplying an etching solution for fatification treatment.

(Background of the idea) Offset printing utilizes the repellency of oil-based ink and water, so dampening water is applied to a plate that has been separated into printed and non-printed areas through chemical treatment. For this purpose, a dampening water supply device consisting of a water cannon and a group of rollers is provided associated with the plate cylinder.

Among these types of offset printing, especially for simple printing suitable for small lots called the direct plate method, an inexpensive paper plate is used as the plate material, and the printing process is performed after or immediately before the plate is attached to the plate cylinder. The paper is desensitized using an etching solution to improve printing quality.

By the way, printing machines for simple printing such as the direct-brate method are essentially small and
It is desired that the structure and operation be simple, and installing a complicated etching liquid supply device in parallel with a dampening water supply device consisting of a large number of roller groups would go against the above requirements. It ends up.

(Prior art) There is a technology disclosed in Japanese Utility Model Application No. 58-24346 as an etching device for an offset printing machine, but this technology is equipped with an etching liquid supply device separate from a dampening water supply device. However, it cannot be said that this is a step forward towards the simplification of printing presses.

(Summary of the invention) The present invention was made in view of the above-mentioned requirements and provides an advanced dual-liquid supply device for offset printing presses. The purpose is to simplify the structure and operation of the system.

Another object of the present invention is that it can be easily modified and installed using an existing dampening water supply system.
The object of the present invention is to obtain a liquid common supply device.

Another object of the present invention is to obtain a two-liquid common supply device that operates reliably.

In order to achieve the above-mentioned purpose, the present device supplies dampening water to the plate on the outer periphery of the plate cylinder via a group of rollers from a water boat storing dampening water, and also supplies etching liquid. The etching roller can be selectively brought into contact with and separated from one of the roller groups.

According to the device of the present invention, during normal supply of dampening water, the etching roller is separated from the roller group, so that no etching solution is supplied to the plate.
Only when necessary to desensitize the plate.
An etching roller is brought into contact with one of the roller groups, and this roller group is used as is to supply etching liquid to the plate.

As a result, according to the present device, it is possible to achieve various objectives such as simplifying the structure and operation of the printing press, and to obtain a printing press that is compatible with the direct plate method.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows two of the offset printing machines according to the present invention.
FIG. 2 is a side view showing the roller arrangement of the liquid common supply device, FIG. 2 is a side view mainly showing the moving mechanism of the etching roller, and FIG. 3 is a plan view thereof.

In the drawing, a so-called dampening water supply device is shown.
Although a conventional type called the MAN type is shown, the present invention is not limited to this, and can also be applied to the Dahlgren type and the spray type.

1 indicates the water boat of the dampening water supply device, and this water boat 1
A dampening solution (actually containing various chemical compounds) is prepared and supplied to the printing plate surface of the printing cylinder 2. Further, numeral 3 indicates a water head roller, which takes out the dampening water from the water boat 1 and transfers it to the water transfer roller 4.
Note that the water head roller 3 is driven by a variable speed water head motor (not shown).

The water transfer roller 4 performs regular reciprocating motion between the water base roller 3 and the water shaking roller 5,
The dampening solution is rotated while contacting the surfaces of these rollers 3 and 5 to transfer dampening water. In addition, the water shaking roller 5 serves to level out the dampening water.
It is made of metal such as stainless steel, and is reciprocated in its axial direction by a known drive mechanism to evenly distribute the dampening water while applying its own rotational force to the dampening rollers 6 and 7, which are free rollers. A water roller 6 rotated in contact with a water shaker roller 5,
No. 7 has a water-retentive coating on its surface and supplies dampening water to the plate surface.

Based on the above-mentioned dampening water supply device, the two-liquid common supply device according to the present invention selectively supplies the etching roller 8 to, for example, the shaking roller 5 of the roller group. The dampening water supply device is designed to be able to be brought into contact with and separated from the dampening water supply device, so that the etching solution can be supplied during printing preparations and the like when supply of dampening water is not necessary.

That is, numeral 9 indicates a tray for storing an etching solution, and an etching roller 8, which is a free roller, is partially immersed in this tray 9. The etching roller 8 is rotated in contact with the water shaking roller 5 as necessary for printing preparation, and the etching liquid is supplied to the printing plate via the water forming rollers 6 and 7, as shown in FIG. A moving mechanism for the etching roller 8 shown in FIG. 3 is provided.

Bearing members 10 are provided at both ends of the etching roller 8 to ensure free rotation.
Guide member 1 on guide rail 12 fixed to
3 in the vertical direction in FIG. 3, and is movable while maintaining a parallel relation to the water shaking roller 5. (In addition, although only the left half of the etching roller 8 etc. is shown in FIG. 3, it can be understood that it is left-right symmetrical.) The etching roller 8 is attached to the guide member 13 by a constantly shaking roller. A spring member 14 is provided so as to bias the guide member 14 in five directions for elastic contact, and the elastic force of the spring member 14 is transmitted to the bearing member 10 via a plunger 15 that is slidable in the guide member 13. . Note that a pin 16 is provided upright on this plunger 15.
For example, when removing the etching roller 8 from the guide member 13, by pushing back the pin 16, the plunger 15 can be moved back against the force of the spring member 14. Also,
The elastic force of the spring member 14 can be adjusted by moving the adjusting screw 17 forward and backward, and when the etching roller 8 is brought into elastic contact with the oscillating roller 5, which is a driving roller, sufficient contact pressure is applied to receive rotational force. Granted.

In order to move the etching roller 8 away from the water shaking roller 5 against the elastic force of the spring member 14, another plunger 18 is slidably provided on the guide member 13, and the tip thereof is attached to a bearing. is in contact with the member 10, and
A pin 19 is horizontally installed on the plunger 18 so as to move forward and backward in a guide groove 20 shown in FIG. The pin 19 is connected to one end of the solenoid arm 21 and the arm 22 of the wet roller 6.
The roller 23 at the end can come into contact with it.

The roughly L-shaped solenoid arm 21 is rotatably supported by an arm shaft 24 engaged with the frame 11, and one end thereof can come into contact with the aforementioned pin 19, and the other end can contact the above-mentioned pin 19. It is connected to a solenoid (not shown) that is activated in response to a signal. Then, when the etching roller 8 is separated from the water shaking roller 5, in other words, when the supply of etching liquid is not required, the solenoid arm 21 is rotated clockwise in FIG. 2 about the arm shaft 24, and the pin 19 and plunger 1
8, the bearing member 10 of the etching roller 8 is pushed to separate the etching roller 8 from the water shaking roller 5. On the other hand, when etching liquid is required, the solenoid arm 21
is returned counterclockwise, and the etching roller 8 is brought into elastic contact with the water shaking roller 5 by the elastic force of the spring member 14. At this time, the etching liquid in the tray 9 is distributed from the etching roller 8 through the water shaking roller 5 to the water forming rollers 6 and 7, and is supplied to the printing plate.

Further, the dampening rollers 6 and 7 are usually separated from the plate surface when printing is stopped. Therefore,
In order to separate the etching roller 8 from the wetting roller 5 during this pause, the wetting roller 6,
A roller 23 is provided on the arm 22 at both ends of the roller 7, and as shown in phantom lines in FIGS.
by pushing against the force of the spring member 14,
The etching roller 8 is separated from the water shaking roller 5.

In other words, only when the dampening rollers 6 and 7 are in contact with the printing plate, and there is no need to supply dampening water, and the solenoid arm 21 is not pushing the pin 19 etc., the etching roller 8 The water shaking roller 5 is moved by the elastic force of the spring member 14.
It is rotated in contact with the etching solution.

[Brief explanation of the drawing]

Figure 1 shows two of the offset printing machines according to the present invention.
FIG. 2 is a side view showing the roller arrangement of the liquid common supply device, FIG. 2 is a side view mainly showing the moving mechanism of the etching roller, and FIG. 3 is a plan view thereof. 1...Mizifune, 2...Print cylinder, 3...Mizumoto roller, 4...Water transfer roller, 5...Water roller, 6, 7...Water forming roller, 8...Etching roller, 9... ... Tray, 10 ... Bearing member, 13 ... Guide member, 14 ... Spring member, 15 ... Plunger, 17 ... Adjustment screw,
18...Plunger, 19...Pin, 21...Solenoid arm, 22...Arm, 23...Roller.

Claims (1)

[Scope of utility model registration request] Dampening water is supplied from a water tank storing dampening water to the plate on the outer periphery of the plate cylinder via a group of rollers, and an etching roller for supplying etching liquid is selectively attached to one of the roller groups. A two-liquid common supply device for offset printing machines that can be brought into contact with and separated from the printer.