JPS6025755A - Printing pad type offset printing apparatus - Google Patents

Abstract

PURPOSE:To enable various printings by the arbitrary combination of printing pads and plates, by mounting plural printing pads to a turret mold, and also providing plural plates. CONSTITUTION:A plurality (four in the drawing) of printing pads 11-14 are secured to a drum (a) which is, in turn, supported by the leading end of a piston rod 6 through a shaft to form a turret mold. The piston rod 6 is made movable up and down by a cylinder 5 and an object (b) to be printed is placed on a table 3 provided under the turret mold. The base part of the cylinder 5 is mounted to a moving member 7 so as to be made movable to left and right directions. Cylindrical plate cylinders (c) are arranged to the left and right of the rising position of the drum (a) in a rotatable manner and a plurality of plates d1-d4 are respectively provided to the surface thereof which rollers for coating the plates d1-d4 with inks are provided. The colors of inks can be also made different in left and right sides.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an offset printing apparatus using a printing pad.

Conventionally, this type of printing pad type offset printing apparatus generally uses a printing pad and a plate in a 1:1 relationship, and performs printing by alternately pressing the printing pad against the printing plate and the substrate. Therefore, it was extremely inconvenient to print in multiple colors, overprint, or print different patterns.

The present invention aims to eliminate the above-mentioned conventional disadvantages and make multicolor printing, overprinting, and pattern-specific printing convenient, by improving the conventional 1:1 relationship between the printing pad and the printing plate,
The printing pad is turret-shaped and equipped with multiple printing pads, as well as multiple printing plates, making it possible to perform a variety of printing by combining pads and printing plates. A turret-type pad device protruding from a radial arrangement is provided facing the printing material so that it can be rotated at any angle and moved vertically as well as horizontally, and one or more plates are arranged on the circumference. A turret-type pad is installed so that an appropriate number of installed cylindrical plate cylinders can be rotated at any angle. j
K is characterized by being provided facing each other.

Embodiments of the present invention will be described with reference to the drawings.

In the drawings, a is a turret-type pad device consisting of a disc (2) on which four printing pads (1) are arranged and protruded radially, and the turret-type pad device a can freely rotate and The printing material is made to move vertically as well as horizontally, and when it rotates, one of the printing pads (1) protruding radially is placed on a lower table (8). Furthermore, the printing pad (1) is made to face the printing plate d of the printing cylinder C fixed on the side, and the printing pad (1) is brought into contact with and separated from the printing material by vertical movement, and the printing pad (1) is moved by horizontal movement. The bad (1) was made to approach and separate from the plate dK.

That is, the rotation of the turret type pad device a is precisely stopped at a predetermined angular position by, for example, a pulse motor (4), and the main pad device a is an air cylinder or the like [5].
is attached to the tip of the piston rod (6) as a driving source and is moved up and down by the operation of the cylinder (5), and furthermore, the moving member (7) to which the cylinder (5) is attached is connected to the moving member (7) as shown in the figure. 7) is provided so as to be able to move horizontally along the guide rod (8), and the gear 〇o, which is interlocked with the servo motor (9) attached to the moving member (7), is moved along the guide rod (8).
) is engaged with the rack αυ provided on the gear (10) to horizontally move the moving member (7), or, although not shown, the moving member (7) is engaged with the guide rod (8).
The moving member (7) is screwed into a screw rod parallel to the screw rod, and the moving member (7) is moved in the horizontal direction by rotation of the screw rod.

The plate cylinder C has a cylindrical shape, and an appropriate number of plates d are arranged on its circumferential surface, and the plate cylinder C is rotated and stopped at a predetermined angle position by a pulse motor (13Vc). Pad (1)
Although it is advantageous to have one plate versus one plate, there is no problem in adding more plates as spares.

In addition, a plurality of plates d can be arranged around the periphery of one plate cylinder C, but in the case of a large number of plates d: the plate cylinder C has a large diameter, and its rotating machine 4'j't K is difficult. Therefore, it can be distributed and arranged in two or more versions. In the illustrated example h, two printing cylinders C are used for four printing pads (1), and each printing cylinder C is provided with printing plates d for two printing pads. When increasing the number of cylinders C, place them sequentially upward as shown by the temporary lines in the drawing.
In accordance with this, the stroke of the downward movement of the turret type pad device a is increased.

In addition, regarding plate cylinder C, internal equipment etc. for plate d are installed,
Also, if necessary, a wiping device for the 4J printing pad (1) may be attached, but this is omitted in the drawing.

In the offset printing apparatus having the above configuration, for example, the two plates d on the plate cylinder C on the right side in the drawing.

d is a red ink plate with different patterns, and plates d and d on the left plate cylinder C are black ink and have different patterns when two-color printing is performed on the substrate. The order is as follows: first, the pad 11 is pressed against the plate d1 of the right plate cylinder C, and after the red pattern is transferred, it retreats, then the plate cylinder C is rotated 900 times, and the pad 1. After pointing downward, down! ! Place the pad on the substrate 1. After printing the red pattern, it is moved upward. At this time, pad (1
Since R) faces the left plate cylinder cK, it presses the pad (1s) against the plate d3, receives the transfer of the black pattern, and retreats.
Next, it is rotated 90 degrees in the opposite direction and moved downward to print a black pattern on the surface of the printing medium, and then moved upward. This allows 92-color printing to be performed, but if you want to print different red and black patterns on subsequent pages, rotate the left and right plate cylinders e and e by 180 degrees, and rotate the pad device a to pad (1 ,2)(1
4), one of them is a red ink pattern (mm) and the other is black ink (4'!). After receiving the transfer, this can then be printed on the surface of the printing medium.

Therefore, in this case, each pad (1,)(1,,)(111
)(14), respectively version d(HT(2+ CI8+
'4 is a specific relationship and cannot be used in unspecified relationships.

As described above, the pad (1) and plate d of the double JHy are set for each ink color and pattern, and the pad (1) and plate d are set in a specific combination, and the pad device i a 11k is set to rotate plate C. By configuring the specific combination relationship, various types of 1. , IJ printing can be done.

In this way, when the present invention is in progress, a plurality of printing pads can be arranged in a turret type! A pad-type printing device is constructed by freely rotating and moving i'i in both vertical and horizontal directions, and combining this with a plurality of plates provided on the circumference of a freely rotatable cylindrical plate cylinder. Therefore, the rotation of the pad device 4 and the plate cylinder can be used for various types of printing, and has the effect of greatly simplifying all printing operations such as multicolor printing, overprinting, I:1, and pattern-based printing.

[Brief explanation of the drawing]

The drawing is a front view showing an embodiment of the present invention. A...Klet type pad device, b...
Printing substrate, C... Cylindrical plate cylinder, d...
Plate, (1)... Stamp pad

Claims (1)

[Claims] A turret-type pad device in which two or more printing pads are arranged and protruded in a radial pattern is provided facing the printing material so that it can be rotated at any angle and moved horizontally as well as vertically. A printing pad type offset printing pad characterized in that a cylindrical plate cylinder with one or more plates arranged thereon is provided facing a turret type (rad device) so that the appropriate number can be rotated at any angle. Printing device.