JPH0367870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a letterpress offset multicolor printing machine, which is primarily suitable for printing on long materials such as pressure-sensitive adhesive label strips.

As shown in Fig. 3, a conventional multicolor printing machine has a mechanism for printing one color with one unit 104 consisting of a plate cylinder 101, a blanket cylinder 102, and an impression cylinder 103, connected to two or four units. There are printers that print in two or four colors through paper sequentially, but as the number of colors increases, it is necessary to increase the number of units 104, and therefore a large installation space is required. Furthermore, because each unit 104 prints one color at a time, skill is required to register each color, and there is a high possibility that misregistration will occur.

The present invention was made in view of such circumstances,
It is an object of the present invention to provide a letterpress offset multi-color printing machine in which the size of the printing machine body can be reduced and registration can be performed extremely easily.

Hereinafter, the present invention will be explained in detail according to embodiments shown in the drawings.

FIG. 1 is a perspective view of a printing machine for printing a continuous body of pressure-sensitive adhesive labels according to an embodiment of the present invention.

Reference numeral 1 denotes a continuous body of labels as a printing material, and a release sheet 2 has a release agent layer formed by applying a silicone resin or the like to the surface of a strip-shaped mount made of paper or the like, and a pressure-sensitive type is applied to the back surface of the release sheet 2. Labels 3 coated with adhesive are temporarily attached at appropriate intervals on the adhesive layer surface. Continuum 1 of such labels
is wound on winding reel 4,
A continuous body of labels 1 continuously fed from a winding reel 4 passes through an advancing/retracting device 5 having a return mechanism to obtain the required printing feed amount, and prints a predetermined line on the surface of the label 3. The printed image is sequentially transferred to a printing device 6 and then to a feeding device 7.

The advancing/retracting device 5 consists of three rollers 8, 9, and 10, and the displacement roller 10
The front roller 8 and the rear roller 9 feed the continuous label 1 through the upper surface and the lower surface of the rear roller 9.
In between, a displacement roller 10 is provided so as to be vertically movable.

Further, the continuous body of labels 1 is passed through a printing device 6,
The feeding device 7 for transferring to the next winding process (not shown) is composed of a feeding roller 12 having a suction hole 11 penetrated through its circumferential surface and connected to a vacuum suction device 13.
The release sheet 2 of the continuous label body 1 is sucked by the vacuum suction device 13 through the suction hole 11 of the feed roller 12, and the feed roller 12 is rotated to feed the continuous label body 1 at an appropriate speed. It is configured as follows.

The printing device 6 includes four sets of plate cylinders 16a, 16 around a blanket cylinder 15 fixed to a rotating shaft 14.
b, 16c, 16d are provided, each plate cylinder 16a,
An inking device 17 is attached to 16b, 16c, and 16d, and an impression cylinder 19 is attached to the lower surface of the blanket cylinder 15.
is pressed into place.

The blanket body 15 has a blanket 15a made of a rubber sheet wrapped around its outer periphery. In the blanket cylinder 15, the length of the blanket 15a is formed to be equal to the length of the plate surface of the plate cylinder 16, and the other portions are one step lower. One end of the blanket 15a is fixed to the blanket body 15, and the other end is rolled up and fixed to keep it under tension.

4 sets of plate cylinders 16a, 16b, 16c, 16d
The printing cylinders 16a, 16b, 16c, and 16d are configured to print appropriate color separated colors in cooperation with an inking device 17, and a letterpress plate 18 is attached thereto. Further, the diameters of the four sets of plate cylinders 16 are approximately the same, and the length is one quarter of the diameter of the blanket cylinder 15.

Then, by rotating the blanket cylinder 15, the first printing cylinder 16a transfers the image of the printing plate of the printing cylinder 16 in the first color to the blanket 15a, and then the printing line of the printing plate of the printing cylinder 16b is transferred to the blanket cylinder 15a by the second printing cylinder 16b. The drawing line is transferred using the second color, and then the third printing cylinder 16c is sequentially transferred.
Then, a predetermined drawing line is transferred by the fourth plate cylinder 16d, and during one rotation of the blanket cylinder 15, the transfer of four colors is completed by superimposing them on the same location on the blanket 15a.

When the impression cylinder 19 is rotated in pressure contact with the blanket 15a of the blanket cylinder 15, a predetermined multicolored streak formed on the surface of the blanket cylinder 15 is printed on the surface of the label 3 of the label continuous body 1 passing between them. (mirror image) is transferred and printed.

However, since there are differences in the diameter and rotational speed of the blanket cylinder 15, as well as the spacing between the labels 3 and the transport speed, the position of the image transferred from the plate cylinder 16 on the surface of the blanket cylinder 15 and the next image are different. A discrepancy occurs between the positional relationship of the label 3 and the label 3 that comes next. In other words, if the outer circumference of the blanket cylinder 15 is longer than the length of the labels 3 and the length between the labels 3, the blanket cylinder 15a rotates once and then rotates later than the label 3 to be printed. Therefore, label 3 is one step ahead. Therefore, when one printing by the blanket cylinder 15 is completed, since the surface of the blanket cylinder 15 is one level lower than the blanket 15a portion, the displacement roller 10 of the advancing/retracting device 5 is moved in the direction of movement of the continuous label body 1. is moved upward in a different, approximately orthogonal direction, and the continuum of labels 1
is pulled back by the necessary printing feed amount, taking into account the distance between labels and the distance to the printing line on the blanket 15a of the blanket cylinder 15 to be printed next.
In other words, the retracting force of the displacement roller 10 is configured to be greater than the suction force of the feeding device 7, and the continuous label body 1 is pulled back in the opposite direction by the upward movement of the displacement roller 10. Then, the blanket 15 of the blanket body 15 is pulled back by a predetermined width.
When you pull it back to the point where the position of the drawing line in part a matches the printing position of label 3 of label continuum 1,
The upward movement of the displacement roller 10 is stopped, and the feeding device 7
to transport the label continuous body 1 in the transport direction,
Accordingly, the displacement roller 10 is lowered to the initial position in accordance with the transport speed of the continuous label body 1, and is kept on standby until the start of the next upward movement.

Then, when the printing device 6 finishes printing the next label 3, the above operation is repeated.

Note that if the impression cylinder 19 is not always pressed against the blanket cylinder 15 side, but can move forward and backward toward the blanket cylinder 15, it will be possible to prevent accurate registration, etc., even in the event of a failure. It can be immediately pulled away from the blanket cylinder 15 to prevent printing on the next label 3.

The present invention is not limited to the above embodiments, but
Needless to say, changes in specifications, applications, modifications, etc. made based on such matters are included in the technical idea of the present invention.

For example, as a return mechanism for obtaining the required printing amount, as shown in FIG.
An advancing/retracting device 5' having 0a and 10b, a front roller 8', and a rear roller 9' may be used. The advancing/retracting device 5' has a front roller 8' and a rear roller 9' disposed at a predetermined interval below the printing area of the blanket cylinder 15' of the printing device 6', and
A front displacement roller 10a is provided above the front roller 8' at the rear opposite to the traveling direction of the printing material 1', and above the rear roller 9' in a direction opposite to the traveling direction of the printing material 1'. A rear displacement roller 10b is provided at the front.

Then, the printing material 1' is rolled up by the front roller 8' and sent from the lower end of the printing material 1' to the printing device 6' via the front displacement roller 10a, and then further advanced to the rear displacement roller 10a.
0b, the sheet travels backward from its lower end in the opposite direction, is changed direction again by the rear roller 9', and is sent forward to the forward feeding device 7'.

When the printing device 6' prints on the printing material 1', the advance of the printing material 1' is stopped by an appropriate stop device 20 provided at the rear position of the front roller 8', and at the same time, the printing material 1' is stopped. Front and rear displacement rollers 10a,
10b moves horizontally while maintaining the same spacing, and as the blanket cylinder 15' rotates, the image line inked on the blanket 15a' is transferred to the surface of the printing material 1', and when the printing is completed, The front and rear displacement rollers 10a, 10b stop advancing, and the front and rear displacement rollers 10a, 10b change their traveling directions again and move backward, returning to their initial positions. Then, the front and rear displacement rollers 10a, 10b stop their moving operations, the stop mechanism of the stop device 20 is released, and the printing material 1' is transported in the sequential direction. The amount of transport of the printing material 1' during this period is determined by the length of the previously printed printing part, the distance between the end of the printing part and the starting end of the printing part to be printed next, and the amount of paper transferred on the blanket cylinder 15'. The length should be determined by taking into consideration the length of the portion 15' until it comes into pressure contact with the printed portion of the printing material 1'. However, the relationship between the advancing/retracting device 5' and the feeding of the printing material 1' may be changed as appropriate depending on the type of the printing material 1' and the configuration of the advancing/retracting device 5'.

The present invention is configured as described above, and the printing apparatus includes a plurality of plate cylinders provided at appropriate intervals around a blanket cylinder having a larger diameter than the plate cylinders,
During one rotation of the blanket cylinder, the printing lines are sequentially transferred and overlapped by the number of plate cylinders at one place on the blanket part of the blanket cylinder, and the printing lines are printed on a printing material such as a label. Because I am doing
Compared to conventional multicolor printing machines that have a plurality of printing units arranged in rows, it can be made smaller, and the printing machine can be installed in a smaller space than conventional machines.

Furthermore, even if the printed area on the printing material does not match the printing line position on the blanket cylinder and it is necessary to narrow the interval and print sequentially, the advancing/retracting device can move the printing material appropriately. Since it can be moved forward and backward by the width, it is possible to print on a free size printing material regardless of the size of the printing material.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a printing press for a continuous body of pressure-sensitive adhesive labels according to an embodiment of the present invention, and FIG. 2 is a front view of a printing press according to a modified example. FIG. 3 is an explanatory diagram of a conventional example. 1...Continuum of labels, 1'...Printing material, 2
...Release sheet, 3... Label, 4... Winding reel, 5, 5'... Advancement/retraction device, 6, 6'...
...Printing device, 7,7'... Feeding device, 8,8'...
Front roller, 9, 9'... Rear roller, 10, 10a,
10b...displacement roller, 11...suction hole, 12...
...Feed roller, 13...Vacuum suction device, 14...
Rotating shaft, 15, 15'... Blanket body, 15
a, 15a'... Blanket, 16... Plate cylinder, 1
7... Inking device, 18... Letterpress, 19... Impression cylinder, 20... Stop device.

Claims (1)

[Claims] 1. In a letterpress offset printing machine, the printing material has a return mechanism for obtaining an appropriate printing feed amount, and a blanket cylinder provided with a blanket part on a part of its circumference, and the blanket cylinder. A plurality of letterpress printing plate cylinders are provided around the periphery at appropriate intervals in order to transfer a plurality of registered drawing lines to the blanket portion multiple times during one rotation of the blanket cylinder. Letterpress offset multicolor printing machine.