JPS63207649A - Plate loading/unloading mechanism in offset press - Google Patents

Abstract

PURPOSE:To automatize a loading/unloading part of a plate, by a method wherein a plate loading/unloading equipment body is fixed on a frame for a printed matter to make a plate cylinder detachable through pinch pins. CONSTITUTION:The counterclockwise rotation of a plate cylinder (a) enables a plate P to be wound around the plate cylinder (a) while being brought into close contact with the plate face of the plate cylinder (a) due to a tension action of a coil spring 4 and a contact pressure of the plate cylinder (a) and a blanket cylinder (b). In this case, the synchronous working of all units allows the plate P to be simultaneously wound around the plate cylinder (a) and to be set automatically. After the plate P is wound around the respective plate cylinders (a) in this manner, the pinch pins 3 are removed from the plate P and the trailing side to be clamped of the plate P is inserted between a plate vice stand 8 and a plate vice cover 10. At this time, the pinch pins 3 are to be automatically contained in a plate loading/unloading equipment body 1. In this manner, the pinch pins 3 of the plate loading/unloading body 1 and the plate P are set into position respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the attachment and detachment of plates in offset printing presses, and is particularly applicable to offset printing presses in which several plate cylinders are arranged side by side, such as multi-color printing machines. The present invention relates to a plate loading/unloading device.

When printing on a conventional offset printing press, the printing plates mounted on each plate cylinder are replaced after finishing printing on a scale and before starting printing of the next printing. In the case of multi-color printing, replacing this plate is a single operation, which is especially time-consuming and labor-intensive. In other words, in the conventional method, first, one end of the plate is clamped in a plate vise on the bite side, the machine is rotated by a certain angle, and the other end is clamped in a plate vise on the other side of the bite side, so that the plate is firmly attached to the plate cylinder. It was installed in the same way, and when it was removed, it was done in the reverse order of installation. Therefore, it is fine if there is one plate cylinder, but if there are two stationary F plate cylinders (multicolor printing such as two-color printing, four-color printing, six-color printing, etc.), this operation must be repeated for each printing cylinder (-color by color). Therefore, it took a long time to change the plates, which caused many problems in work efficiency.

As a result of many years of research, the applicant of this application has developed a technique to solve these problems, and has already filed a patent application for the invention (Japanese Patent Application No. 159542/1982). That is, this invention includes a plate guide for inserting the plate and feeding it toward the plate cylinder, and a plate pressing roller for pressing the plate through a spring and a stopper pin using a lever to which a roller is attached. The incoming plate is attached to the plate vise of the plate cylinder, and the plate is attached to the plate cylinder surface via the plate pressing roller without rotating the plate cylinder.The plate mounting mechanism and the tip of the winding spring A plate pulling tool equipped with a clamping pin is provided on the plate, and the plate pulling pin is clamped to one end of the plate wrapped around the plate cylinder, and the plate is pulled through the plate pressing roller while rotating the plate cylinder. This is a plate attachment/detachment device for an offset printing press that includes a plate detachment mechanism. This device has plate pulling 1
Since the plate guide and the plate guide are separate, the structure and mechanism are not only complicated, but also various inconveniences arise in operation.

Problems to be Solved by the Invention The problems to be solved by the present invention are as follows: The problem to be solved by the present invention is to automate the plate loading/unloading process using an internal mechanism, whereas in the past the printing plate had to be changed manually one color at a time. In other words, the four steps of loading and unloading the plate onto the plate cylinder are automated to make plate replacement much easier and to ensure safety, and the plate changing position on the plate cylinder is always at a constant position. The problem to be solved by the present invention is to simplify the work of changing plates.

One stage of the present invention to solve the problem is a plate attaching/detaching tool main body which has a clamping pin attached to one end and the other end is housed inside a plate support case, and a plate with the other end on the buttock side of the plate. It consists of a plate vise that is inserted between a vise stand and a plate vise lid, and the plate attaching/detaching tool main body is fixed on the frame of the printed material, and the plate cylinder can be freely detached via a pin. The plate loading and unloading mechanism for an offset printing press is characterized by the following: After inserting clothes into the plate vise stand and plate vise lid on the Oq side, the plate cylinder is moved in the opposite direction from the clockwise direction. The plate is attached to the plate cylinder while rotating, and after the attachment, the plate is removed from the clamping pins and inserted between the plate vise stand on the butt side and the plate vise lid, and the plate is attached to the clamping pin. All of these problems can be solved by sandwiching the desired plate between pins and suspending it from the side wall of the frame. In other words, the means for solving the problems of the present invention are: 1. The plate can be attached and removed freely even without the plate guide developed by the applicant, and 2. The plate can be attached and detached, and the plate can be easily attached and detached by holding the desired plate between the clamping pins of the plate extractor.

Function The present invention involves clamping one end of the plate to the tip of the main body of the plate attachment/removal tool, and inserting the other end of the plate into a plate vise on the bite side, and rotating the plate cylinder in the opposite direction to the clockwise direction. As a result, the plate is wound around the plate surface of the plate cylinder while being pulled by the winding spring, so that the plate is tightly wound around the plate cylinder.

On the other hand, after being wrapped, the plate is attached and removed 1 (by loading the plate from the clamping pins on the main body and inserting it into the plate vise on the butt side, the plate can be safely and securely placed on the plate cylinder surface. In other words, in the present invention, one end of the plate is attached via a winding spring, so when the plate is wound around the plate cylinder, it can be attached by a tensioning action, and at the same time, when it is detached, it can be attached. In this case, the plate can be automatically removed from the plate cylinder by simply rotating the plate cylinder in the opposite direction (the same direction as clockwise).

EMBODIMENTS Hereinafter, practical examples of the present invention will be described with reference to the drawings.

FIG. 1 is an overall mechanical diagram of four-color printing of an offset printing machine used in the apparatus of the present invention, and is composed of a paper feeding section (A), a printing section (B), and a paper discharging section (C). The printing section (B) in this figure shows the multicolor mechanism for four-color printing, where a is the plate cylinder, b is
is the blanket cylinder, C is the feed cylinder, d is the pressure cylinder, e is the transfer cylinder, and f is the delivery cylinder.

FIG. 2 is an enlarged view showing the structure of the mechanism of the present invention in the offset printing press shown in FIG. 1. ! 1 is the main body of the plate attachment/detachment tool, which is the essential part of the present invention, and is attached to the frame L of the printing section (B). In this plate attaching/detaching tool main body 1, a winding spring 4 to which a clamping pin is attached is housed in a plate supporting case 2 via a boot. That is, the clamping pin 3 is connected to the coiled spring 4.
A clamping pin 3 housed inside the plate support case 2 is elastically installed through the plate support case 2. 5.6 is the plate vise of the plate cylinder a, 5 is the plate vise on the bite side, and 6 is the plate vise on the bite side. 7.8 is a plate vise stand, and 9, lO is a plate vise lid. That is, the plate vise 5 on the bite side is composed of a plate vise stand 7 and a plate vise cover 9, and the plate vise 6 on the bite end side is composed of a plate vise stand 8 and a plate vise cam 10.
It is composed of. Next, the method of attaching and detaching the plate P will be explained with reference to (b) +4 and (c) figures. first,
Activate the switch for plate setting to rotate the plate cylinder,
Attach the plate P to the plate cylinder a and stop it at the recommended position. In this case, all units up to 1 color 11 or 64 colors 11 are automatically stopped. Next, open the occlusal side and occlusal side plate mankani, tL9, and IO via the handles (18B! without lik), and place the plate between the occlusal side plate vise stand 7 and the plate vise lid 9. Insert the tip of the handle and tighten it. In this way, once the plate P is inserted into the plate vise 5 on the occlusal side, the clamping pin 3 housed in the plate attachment/detachment 11 body 1 via the winding spring 4 is pulled in the direction F, ( b) Pinch the butt end of the plate P as shown in the figure. In this way, the plate P can be supported by the tension of the coiled spring 4.

Figure 3 shows the plate P being placed on the plate cylinder a in the state shown in Figure 2 (A).
This shows how to wrap it around. First, Figure 1 (
As shown in b)! Once all the units for colors up to 4 colors [1] have been set, the plate cylinder a and the blanket cylinder are brought into contact and ready for printing. Next, the plate setting switch is activated to rotate the plate cylinder a in the opposite direction from the clockwise direction. Then, as shown in FIG. 3(A), the plate P can be wrapped around the plate surface of the plate cylinder 3 by the tensile action of the winding spring 4 and the contact pressure between the plate cylinder a and the blanket j14b. . In this case, all the units are operated simultaneously, so that the plates P can be wound around the plate cylinder a at the same time and can be set automatically. Once the plate P is wrapped around each plate cylinder a in this way, remove the clamping pin 3 from the plate P and place the butt end of the plate P between the plate vise stand 8 and the plate vise 110. Insert. At this time, the clamping pin 3 is automatically housed in the main body 1 of the plate attachment/detachment tool. Then, as shown in FIG. 3(a), the clamping pins 3 of the plate attaching/detaching tool main body l and the plate P are respectively set.

Next, when removing the plate P, first move the clothes setting switch six times to stop the plate cylinder a at the desired location, open the plate vises 210 on the bite side and the buttock side, The plate P on the buttock side is pulled from the plate vise 6 and clamped onto the clamping pin 3. Next, the plate setting switch is operated again to rotate the plate cylinder a clockwise. Then, as shown in FIG. 3(c), the plate P can be easily pulled out in eight spins from the plate cylinder a, and can be suspended as it is on the clamping pins 3.

Effects of the Invention Since the present invention is constructed as follows, it is possible to easily and safely attach and detach a plate to and from a plate cylinder, and it is also possible to simultaneously attach and detach several plates. It is considered to be a plate loading and unloading device for offset printing presses that is superior to the Juto from all aspects such as performance, operation, work, economy, and practical aspects due to the fact that it is a simple device.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing the mechanism of the present invention, and FIGS. 2 and 314 are partially enlarged explanatory views of essential parts showing the configuration and operation of the mechanism of the present invention. t -'--Plate attaching/detaching tool body 2--Plate support case 3--Pinch pin 4-Partial spring 5, 6-
- Rice vise 7.8 - 1. Plate vise stand 9.10 - - Plate vise lid A - 11 Paper feeding section B-1 Printing section C - Paper ejection section

Claims (1)

[Scope of Claims] 1. A plate attaching/detaching tool main body having a clamping pin for pinching one end of the plate attached to its tip and the other end disposed inside the plate support case; It consists of a plate vise that is inserted between the force stand and the plate vise lid, and the other end of the plate is inserted between the plate vise table on the bite end side and the plate vise lid, and A plate attachment/detachment mechanism for an offset printing press, characterized in that a tool body is fixed on a frame of a printing section, and a plate cylinder can be freely attached and detached via a clamping pin. 2. After inserting the plate between the plate vise stand and the plate vise cover on the bite side, attach the plate to the plate cylinder while rotating the plate cylinder in the opposite direction to the clockwise direction, and The plate attaching/detaching mechanism for an offset printing press according to claim 1, wherein the plate is then removed from the clamping pin and inserted between the plate vise stand and the plate vise cover on the butt end side. 3. A plate attachment/detachment mechanism in an offset printing press according to claim 1, wherein a desired plate is clamped between the clamping pins and suspended from the side wall surface of the frame.