JP2865464B2 - Multicolor offset printing device - Google Patents

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 plate.

[0002]

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

As a conventional offset printing apparatus, as disclosed in Japanese Patent Application Laid-Open No. 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 gantry, and ink is supplied on the printing plate by, for example, a coloring roller or a dispenser, and each printing plate is supplied with ink. Squeezing the ink on the printing plate with a corresponding scraper, then transferring multiple blankets corresponding to each printing plate to the printing plate to transfer the image on the plate onto the blanket surface and fixing it on the fixed base In some cases, images on a plurality of blankets are re-transferred onto the surface of a transferred object such as a glass substrate to obtain a multicolor printing pattern.

[0004]

In printing requiring, for example, black stripes and four plates of RGB, such as color filters, four printing plates required for printing are fixed on a single frame. , A scraper and a blanket corresponding to the printing plate are arranged at respective positions adjacent to the printing plate. However, such a configuration requires sufficient space on the gantry to hold four printing plates and four corresponding blankets. Therefore, the overall length or width of the printing press becomes longer, the size of the printing device becomes larger, assembling becomes difficult, and the processing accuracy is also reduced. In addition, with the recent diversification of patterns, it is necessary to print a plurality of types of patterns in one printing apparatus.
It must be possible to easily change the printing plate. However, it is difficult for a conventional printing press to always have a plurality of printing plates, and when changing a printing medium having a different pattern, all the printing plates mounted on the printing press must be removed manually by an operator. In addition, it was necessary to mount a new printing plate while positioning it with high precision.

The present invention relates to multicolor offset printing,
It is an object of the present invention to provide a multicolor printing offset printing apparatus capable of storing a plurality of printing plates in a compact manner, realizing miniaturization of the multicolor printing apparatus, and easily replacing the printing plates mounted on the printing press.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, a multi-color offset printing press according to the present invention comprises: a stocker arranged on a gantry for accommodating a plurality of printing plates; A carriage on which the printing plate is detachably mounted so as to be movable in the direction, an ink supply device for supplying printing ink to a pattern forming surface of the printing plate mounted on the carrier, and a carrier mounted on the carrier. A scraper that slides on the printing plate surface to scrape the ink on the printing plate surface, and a pattern image of the printing plate is transferred to the peripheral surface by sliding on the printing plate surface mounted on the carrier. A plurality of blankets selected according to the printing plate on the carrier, and a transfer target to which a pattern image transferred to the peripheral surface of the blanket is re-transferred, and a printing plate required from the stocker according to a printing order. The above Those configured to mount on Okudai.

[0007]

With this configuration, a plurality of printing plates can be compactly stored in the stocker, the size of the multicolor printing apparatus can be reduced, and the printing plates mounted on the printing press can be easily replaced. In addition, since the printing plate for each stocker can be replaced according to the type of the printing medium, replacement and adjustment by the operator can be simplified.

[0008]

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 press according to an embodiment of the present invention, and FIG. 2 is a plan view of the multicolor offset printing press.

In FIG. 1, reference numeral 1 denotes a base, on which a set of guide rails 2 and two ball screws 3a, 3b are provided.
The printing plate carrier 4 is attached to the ball screw 3a, and the printing material carrier 5 is attached to the ball screw 3b. The ball screws 3a, 3b
The printing plate carrier 4 and the printing medium carrier 5 can be simultaneously or independently moved to arbitrary positions according to a printing program by driving a servo motor 6 attached to the printer. On the other hand, man-hours can be reduced, for example, by replacing the printing plate. A stocker 8 for storing the printing plates 7a to 7d, a fixed frame 10 for holding the scrapers 9a to 9d, and a fixed frame 12 for holding the printing blankets 11a to 11d are mounted on the gantry 1. The stocker 8 is provided with, for example, a printing plate for black matrix (hereinafter referred to as a printing plate for BM) and an RGB printing plate used for printing a color filter for liquid crystal. In this embodiment, 7a is a printing plate for BM, 7b is a printing plate for R, 7c is a printing plate for B, and 7d is a printing plate for G. Printing plates 7a to 7d which are taken out of the stocker 8 in the printing direction by the take-out mechanism 13 with respect to the gantry 1 in the horizontal direction.
Is supported by a printing plate support pin 15 which moves up and down by an air cylinder 14, and is mounted on the printing plate transport table 4 which has been waiting as the support pin 15 is lowered. A positioning pin 16 is provided on the lower surface of each of the printing plates 7a to 7d, and is always mounted at a fixed position on the printing plate carrier 4. Printing ink is applied on the surface of the printing plates 7a to 7d mounted on the printing plate transport table 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 has scrapers 9a to 9d corresponding to each plate and the scrapers 9a to 9d.
Air cylinders 18a to 18d for raising and lowering the printing plate are mounted, and printing ink applied on the printing plate surfaces of the printing plates 7a to 7d is skied by 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 held on both sides of the fixed frame 12 by two rotating disks 19 and corresponding to the printing plates 7a to 7d.
The blankets 11a to 11d are attached to a turntable 19, and the origins are set by motors 21 for setting the origin corresponding to the blankets 11a to 11d.
Is rotated by a blanket replacement motor 20 attached to the fixed frame 12, the turntable 19 is rotated according to the printing order,
The blanket corresponding to the printing plates 7a to 7d is exchanged. 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 ball screw 3b rotates in a state where the blanket 11a is 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 completion of the transfer, the printing plate 7a moves to the printing plate support pins 15 to replace the printing plate, removes the BM printing plate 7a from the printing carrier 4, and prints the R plate necessary for the next printing according to the printing program. Exchange with the plate 7b is performed. The origin of the blanket 11a is determined by a motor 21 for determining the origin. Next, on the printing medium carrier 5, a printing medium such as a glass substrate 23 and an adhesive sheet 24 for cleaning the peripheral surfaces of the blankets 11a to 11d can be mounted. It is accurately positioned and fixed on the body carrier 5. The printing medium transport table 5 moves to the fixed frame 12 by the movement of the ball screw 3a.
BM blanket 11a with pattern image transferred to the surface
Makes contact with the surface of the glass substrate 23 with a constant pressing force by an air cylinder, and transfers the pattern image onto the surface of the glass substrate 23 by moving the ball screw 3a. After transferring the pattern image to the surface of the glass substrate 23, the cleaning adhesive sheet 24 arranged on the printing medium transport table 5 moves to the fixed frame 12 by the movement of the ball screw 3a, and the adhesive sheet
The adhesive on the adhesive surface of the adhesive sheet 24 is transferred to the adhesive surface of the blanket sheet 24, and is removed. After the cleaning is completed, the adhesive sheet 24 is sent out by a paper take-out motor 25a and taken up by a paper take-out motor 25b. After cleaning, the BM blanket 11a is replaced with a blanket replacement motor.
The rotary disc 19 is rotated by 20, and is replaced with the next blanket 11b for R according to the printing program. Thereafter, 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. In the case where the formation of a black matrix is not required during the color filter printing, the blanket for BM can be used as a spare blanket.

Further, when performing multicolor printing in which a printing medium requires a pattern image different from a color filter, it is necessary to exchange a printing plate according to the printing medium.
In this printing press, since the stocker 8 arranged on the gantry 1 is detachable from the gantry 1, the stocker 8 is removed from the gantry 1 in accordance with a printing medium, and a plurality of printing plates already prepared are stored. By attaching another stocker, it is possible to easily cope with a model change.

[0012]

As is apparent from the above description, according to the present invention, a plurality of printing plates can be compactly stored in a stocker, so that a multi-color printing apparatus can be reduced in size, and a printing machine can be realized. The printing plate to be mounted can be easily replaced. In addition, since the printing plate for each stocker can be replaced according to the type of the printing medium, replacement and adjustment by the operator can be simplified.

[Brief description of the drawings]

FIG. 1 is a side view of a multicolor offset printing press according to an embodiment of the present invention.

FIG. 2 is a plan view of a multicolor offset printing press according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stand 2 Guide rail 3a Ball screw 3b Ball screw 4 Printing plate carrier 5 Printed object 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 Blanket for printing 11b Blanket for printing 11c Blanket for printing 11d Blanket for printing 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 Turntable 20 Blanket replacement motor 21 Home search motor 22 Guide groove 23 Glass substrate 24 Adhesive sheet 25a Paper unwinding motor 25b Paper winding motor

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noboru Aikawa 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 17/14 B41F 3/20 B41F 3/34

Claims (1)

(57) [Claims] 1. A stocker arranged on a gantry for accommodating a plurality of printing plates, a transport gantry arranged on the gantry and movable in the axial direction of a moving shaft, on which the printing plates are detachably mounted,
An ink supply device for supplying printing ink to a pattern forming surface of a printing plate mounted on the carrier, and a scraper that slides on the surface of the printing plate mounted on the carrier and scrapes ink on the surface of the printing plate; And, a plurality of blankets selected corresponding to the printing plate on the carrier 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 carrier, A multicolor printing offset printing apparatus, comprising: a transfer body onto which the pattern image transferred to the peripheral surface of the blanket is retransferred; and mounting a necessary printing plate on the transfer table from the stocker in a printing order.