JPH05162287A - Multicolor rotary offset press - Google Patents

Abstract

PURPOSE:To obtain a multicolor rotary offset press which can easily change a printing plate to be mounted on a printer by a method wherein a plurality of printing plates are compactly housed to realize miniaturization of a multicolor printer by installing a necessary printing plate onto a carrier base from a stacker according to a printing order. CONSTITUTION:If a blanket 11a is taken as a blanket for BM, by rotation of a ball thread 3b under a state wherein it comes in contact with a printing plate for BM 7a, a pattern image on the printing plate 7a is transferred onto a peripheral surface of the blanket 11a. The printing plate 7a after finishing transfer is moved to printing plate support pins 15 in order to exchange the printing plate, and the printing plate for BM 7a is taken away from a printing carrier base 4, which is changed for a printing plate for R 7b which is necessary for next printing according to a printing program. Further, for the blanket 11a, its original point is set with an original point-setting motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for printing a multicolor pattern such as a color filter, and more particularly to a multicolor offset printing apparatus using a lithographic printing plate.

[0002]

2. Description of the Related Art Conventionally, various methods have been known as a technology for performing multicolor printing on a color filter or the like used in a liquid crystal receiver, and an offset printing apparatus is typical as a typical one. .

As a conventional offset printing apparatus, as disclosed in JP-A-63-265641,
A plurality of printing plates required for pattern formation, for example, a black matrix printing plate and RGB printing plates are arranged on a frame, and ink is supplied onto the printing plates by, for example, a coloring roller or a dispenser, and each printing plate is supplied. Squeeze the ink on the printing plate with a corresponding scraper, and then contact the printing plates with multiple blankets corresponding to each printing plate to transfer the image on the printing plate surface to the blanket surface and fix it on the fixed table. There is one configured so that a multicolor printing pattern can be obtained by retransferring images on a plurality of blankets onto the surface of a transfer target such as a glass substrate.

[0004]

In the printing requiring a black stripe and RGB four plates such as a color filter, for example, four printing plates required for printing are fixed on one pedestal and at the same time. , A scraper and a blanket corresponding to the printing plate are arranged at respective positions adjacent to the printing plate. However, in such a structure, a sufficient space for holding four printing plates and four blankets corresponding thereto is required on the pedestal. Therefore, the total length or width of the printing machine becomes long, the printing apparatus becomes large-sized, the assembly becomes difficult, and the processing accuracy is lowered. In addition, with the recent diversification of patterns, it is necessary to print a plurality of types of patterns in one printing device.
It should be possible to easily replace the printing plates. However, in a conventional printing machine, it is difficult to always have multiple printing plates, and when changing the printing materials with different patterns, all the printing plates mounted on the printing machine must be removed by the operator's hand. , It was necessary to attach a new printing plate while positioning it accurately.

The present invention relates to multicolor offset printing,
An object of the present invention is to provide a multicolor printing offset printing apparatus capable of accommodating a plurality of printing plates compactly, realizing the downsizing of the multicolor printing apparatus, and easily replacing the printing plates mounted on the printing machine.

[0006]

In order to solve this problem, a multicolor offset printing machine according to the present invention comprises a stocker arranged on a stand for accommodating a plurality of printing plates, and a shaft of a moving shaft arranged on the stand. A carriage that is movable in the direction and on which the printing plate is detachably mounted, an ink supply device that supplies printing ink to the pattern forming surface of the printing plate that is mounted on this carriage, and a printing plate that is mounted on the carriage. A scraper that slides on the surface of the printing plate to scrape off the ink on the surface of the printing plate, and a pattern image of the printing plate is transferred to the peripheral surface by sliding on the surface of the printing plate mounted on the carrier. A plurality of blankets selected corresponding to the printing plate on the carrier and a transfer target to which the pattern image transferred to the peripheral surface of the blanket is retransferred, and a printing plate required from the stocker according to the printing order. The above Those configured to mount on Okudai.

[0007]

With this structure, a plurality of printing plates can be compactly stored in the stocker, the multicolor printing apparatus can be downsized, and the printing plates mounted on the printing machine can be easily replaced. Further, since the printing plate for each stocker can be replaced according to the type of the printing medium, the replacement and adjustment by the operator can be simplified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a multicolor offset printing machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the same multicolor offset printing machine.

In the figure, reference numeral 1 is a pedestal on which a set of guide rails 2 and two ball screws 3a and 3b are mounted.
The printing plate carrier 4 is attached to the ball screw 3a, and the printing medium carrier 5 is attached to the ball screw 3b, respectively.
It is possible to move the printing plate carrier 4 and the printing medium carrier 5 to arbitrary positions simultaneously or independently according to the printing program by driving the servomotor 6 attached to the printing plate carrier. For example, while performing the printing process, On the other hand, it is possible to reduce the number of steps such as exchanging the printing plate. A stocker 8 for accommodating the printing plates 7a-7d, a fixed frame 10 for holding the scrapers 9a-9d, and a fixed frame 12 for holding the printing blankets 11a-11d are mounted on the base 1. The stocker 8 is equipped with, for example, a black matrix printing plate (hereinafter referred to as a BM printing plate) used for printing a liquid crystal color filter, an RGB printing plate, and the like. In this embodiment, 7a is a BM printing plate, 7b is an R printing plate, 7c is a B printing plate, and 7d is a G printing plate. Printing plates 7a to 7d taken out horizontally from the stocker 8 by the take-out mechanism 13 with respect to the gantry 1 in the printing order.
Is supported by a printing plate support pin 15 that is moved up and down by an air cylinder 14, and is mounted on the printing plate transport table 4 that has already been waiting as the support pin 15 descends. Positioning pins 16 are provided on the lower surface of each of the printing plates 7a to 7d, and they are always mounted at fixed positions on the printing plate transport table 4. Printing ink is applied to the surfaces of the printing plates 7a to 7d mounted on the printing plate carrier 4 by, for example, a coloring roller or a dispenser 17, and then moved to the fixed frame 10 by the ball screw 3b. The fixed frame 10 includes scrapers 9a to 9d corresponding to each plate and the scrapers 9a to 9d.
Air cylinders 18a to 18d for moving up and down are mounted, and the printing ink applied on the plate surfaces of the printing plates 7a to 7d is squeezed by the scrapers 9a to 9d. The squeezed printing plates 7a to 7d are moved to the fixed frame 12 by the ball screw 3b. Blankets 11a to 11d corresponding to the respective printing plates 7a to 7d are held on the fixed frame 12 by the two rotary plates 19 from both ends.
The blankets 11a to 11d are attached to the turntable 19 and the origin is set by the origin finding motor 21 corresponding to each of the blankets 11a to 11d.
The blanket replacement motor 20 attached to the fixed frame 12 rotates the turntable 19 according to the printing order,
The blankets corresponding to the printing plates 7a to 7d are replaced. The blankets 11a to 11d and the turntable 19 are moved up and down by a guide groove 22 formed on the side surface of the fixed frame 12 and an air cylinder (not shown) fixed to the fixed frame 12, and the printing plate 7a is pressed with a constant pressing force. Contact the plate surface of ~ 7d.

In the figure, if the blanket 11a is a blanket for BM, the printing plate 7 is rotated by rotating the ball screw 3b in contact with the printing plate 7a for BM.
The pattern image on a is transferred onto the peripheral surface of the blanket 11a. After the transfer is completed, the printing plate 7a moves to the printing plate support pin 15 for printing plate replacement, removes the BM printing plate 7a from the printing carrier 4, and prints R for the next printing according to the printing program. The plate 7b is exchanged. The blanket 11a is home-originated by the home-originating motor 21. Next, the print medium, such as the glass substrate 23 and the adhesive sheet 24 for cleaning the peripheral surfaces of the blankets 11a to 11d, can be mounted on the print medium conveying body 5, and the glass substrate 23 is printed. It is positioned and fixed on the body carrier 5 with high accuracy. The printing material carrier 5 moves to the fixed frame 12 by the movement of the ball screw 3a.
Blanket for BM 11a with pattern image transferred on the surface
Is brought into contact with the surface of the glass substrate 23 by an air cylinder with a constant pressing force, and the pattern image is transferred onto the surface of the glass substrate 23 by the movement of the ball screw 3a. After the pattern image is transferred onto the surface of the glass substrate 23, the cleaning adhesive sheet 24 arranged on the substrate 5 to be printed moves to the fixed frame 12 by the movement of the ball screw 3a, and the adhesive sheet
The adhesive surface of 24 is brought into contact with the adhesive surface with a constant pressing force, and the residual material on the surface of the blanket is transferred onto the adhesive surface of the adhesive sheet 24 and removed. After the cleaning is completed, the adhesive sheet 24 is sent out by the paper take-out motor 25a and taken up by the paper take-out motor 25b. The BM blanket 11a after cleaning is a blanket replacement motor.
The turntable 19 is rotated by 20 and is replaced with the next blanket 11b for R according to the printing program. Subsequently, RGB printing is repeated in the same manner as in BM printing, and a color filter is formed on the surface of the glass substrate 23. When it is not necessary to form a black matrix during the color filter printing, the BM blanket can be used as a preliminary blanket.

Further, when performing multicolor printing in which the printing material requires a pattern image different from that of the color filter, the printing plate needs to be replaced according to the printing material.
In this printing machine, the stocker 8 arranged on the pedestal 1 is detachable from the pedestal 1, so the stocker 8 is removed from the pedestal 1 according to the material to be printed, and a plurality of printing plates already prepared are stored. It is possible to easily change the model by installing a separate stocker.

[0012]

As is apparent from the above description, according to the present invention, since a plurality of printing plates are compactly stored in the stocker, the multicolor printing apparatus can be downsized, and the printing machine It is possible to easily replace the printing plate to be mounted. Further, since the printing plate for each stocker can be replaced according to the type of the printing medium, the replacement and adjustment by the operator can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of a multi-color printing offset printing machine according to an embodiment of the present invention.

FIG. 2 is a plan view of a multi-color offset printing machine according to an embodiment of the present invention.

[Explanation of symbols]

 1 frame 2 guide rail 3a ball screw 3b ball screw 4 printing plate carrier 5 printing medium carrier 6 servo motor 7a printing plate 7b printing plate 7c printing plate 7d printing plate 8 stocker 9a scraper 9b scraper 9c scraper 9d scraper 10 fixed frame 11a Printing blanket 11b Printing blanket 11c Printing blanket 11d Printing blanket 12 Fixed frame 13 Removal mechanism 14 Air cylinder 15 Printing plate support pin 16 Positioning pin 17 Dispenser 18a Air cylinder 18b Air cylinder 18c Air cylinder 18d Air cylinder 19 Rotating plate 20 Motor for blanket replacement 21 Motor for origin search 22 Guide groove 23 Glass substrate 24 Adhesive sheet 25a Paper winding motor 25b Paper winding motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Aikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A stocker arranged on a pedestal for accommodating a plurality of printing plates, and a transport table arranged on the pedestal and movable in the axial direction of a moving shaft so that the printing plates are detachably mounted.
An ink supply device for supplying printing ink to the pattern forming surface of the printing plate mounted on the carrier, and a scraper for sliding the ink on the surface of the printing plate mounted on the carrier to scrape the ink on the surface of the printing plate. And a plurality of blankets selected corresponding to the printing plate on the transport table so that the pattern image of the printing plate is transferred to the peripheral surface by sliding on the surface of the printing plate mounted on the transport table, A multicolor offset printing apparatus comprising: a transfer target to which the pattern image transferred to the peripheral surface of the blanket is retransferred, and a necessary printing plate is mounted on the transport table in the printing order from the stocker.