JPH05254086A - Registering device of rotary press - Google Patents

Abstract

PURPOSE:To easily perform printing alignment at the time of the replacement of a plate within a short time with high accuracy. CONSTITUTION:In a rotary press wherein a plurality of plate cylinders 1, 2 being in contact with impression cylinders 3, 4 are arranged at a definite interval and printing is applied to the object 5 to be printed passing through the gaps between the plate cylinders 1, 2 and the impressure cylinders 3, 4 by the plates 28 mounted on the plate cylinders 1, 2, a registering means 22 capable of adjusting the length of the object 5 to be printed between the contact points of the plates 28 provided to the mutually adjacent plate cylinder 1, 2 and the object 5 to be printed is provided between the plate cylinders.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a register adjusting device for a rotary press used for multicolor printing of labels and the like.

[0002]

2. Description of the Related Art An example of a multi-color rotary printing press for printing labels is shown in FIG. The rotary press has a large-diameter drive gear 42 fixedly mounted on a drive shaft 41, a plurality of equally-spaced small-diameter impression cylinders 43 driven by the drive gear 42, and the same and associated with each impression cylinder 43. An object to be printed 45 (roll paper) that is composed of a plurality of plate cylinders 44 that rotate at a peripheral speed and is wound around an impression cylinder 43 and sent.
In addition, printing is performed by the plate 28 (see FIG. 5) mounted on each plate cylinder 44.

Generally, the plate 28 is mounted on the front surface of the outer periphery of each plate cylinder 44, the impression cylinder 43 and the plate cylinder 44 are continuously rotated during printing, and the material 45 to be printed is continuously fed and printed. Is. Conventionally, when the size of the plate 28 is small and the plate cylinders 1 and 2 having a large cylinder diameter are used as shown in FIG. 5, printing position alignment, that is, register adjustment is performed by changing the interval between the plate cylinders 44. Moreover, the plate cylinder 44 is continuously rotated, but the impression cylinder 43 is intermittently rotated to intermittently transfer the printing material 45.

[0004]

By the way, in the above-mentioned prior art, in label printing, which requires printing of various kinds in small quantities, preparation for register adjustment and the like is troublesome every time the size of the plate changes, and it takes a lot of time. In addition, in the case of multicolor printing, since color matching is performed for each plate while driving, there is a problem that a large amount of waste paper occurs until the color matching is completed.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to perform printing position alignment at the time of exchanging a plate and the like in a very simple manner, in a short time and with high accuracy. To provide a register adjusting device for a turning point.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention, a plurality of plate cylinders contacting the impression cylinder is arranged at a constant interval,
In a rotary press adapted to print on a printing medium passing between the plate cylinder and the impression cylinder by a plate mounted on each plate cylinder, a contact point between each plate and the printing object provided on adjacent plate cylinders. It is characterized in that a register adjusting roller for adjusting the length of the material to be printed between the plate cylinders is provided between the plate cylinders.

Further, according to the present invention, the register adjusting rollers provided between the plate cylinders are composed of a plurality of rollers that are in contact with the material to be printed, and the axes of the rollers are arranged parallel to the axis of the plate cylinder. In addition, at least one of the rollers is provided so as to be movable in a direction perpendicular to the axis. Further, the present invention is characterized in that a hydraulic cylinder or a screw structure is used as a driving unit of the movable register adjusting roller.

[0008]

According to the present invention, when the length of the plate mounted on the plate cylinder in the rotating direction changes, the register adjusting roller contacting the object to be printed intersects with the direction of transfer of the object to be printed, corresponding to the length of the plate. By moving the plate in the direction indicated by the arrow, the length of the printing material between the contact points of each plate and the printing material can be adjusted, and the printing position of each printing plate on the printing material can be adjusted.

When there are a plurality of register adjusting rollers,
The register adjustment can be performed by moving at least one of them in a direction intersecting or parallel to the printing material transfer direction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. 1, 2 are plate cylinders arranged at a predetermined interval (invariant) so as to be continuously rotatable, 3 and 4 are impression cylinders parallel to the plate cylinders 1 and 2. The printed material 5 is arranged side by side, and the printed material 5 is intermittently fed by the feed roller 6.

An unwinding reel 7 has an unprinted object 5 (roll paper) wound thereon. 8 is a take-up reel on which the printed material 5 is wound. 9,10 are pinch rollers for the substrate 5 consisting of a pair of top and bottom, 11 and 12 are dancer rollers, 13
Is a back tension roller, 14, 15, 16, 17 are guide rollers, and 18, 19, 20 are presser rollers for the printing material. Reference numerals 21 and 22 are register adjusting rollers, which are arranged in parallel with the plate cylinders 1 and 2 so that the material to be printed 5 contacts between the plate cylinders 1 and 2, and the upper register adjusting roller 22 is The roller 21 is rotatably supported via a shaft 25 at the tip of a swing arm 24 that rotates concentrically with the shaft 23 of the roller 21.

The swing arm 24 is a hydraulic cylinder.
It rotates about the shaft 23 by 26, and thereby the upper register adjusting roller 22 is moved in the directions shown by arrows a and b in the figure, and is controlled by the controller 27.
That is, when the length of the plate cylinder 1 and 2 in the rotation direction of the plate 28 is input to the control device 27, the movement amount of the register adjusting roller 22 is automatically calculated, and the hydraulic cylinder 26 is operated by the output signal thereof,
According to the length of 28, the length of the material to be printed 5 between the contact points of the plate cylinders 1 and 2 and the impression cylinders 3 and 4 is adjusted, and the reference position B (see FIG. 5) of each plate 28 is adjusted. It is designed to match exactly.

Reference numerals 29 and 30 denote ultraviolet ray drying devices for rapidly drying and curing the printing ink (made of ultraviolet ray curing resin) so that the ink does not adhere to the register adjusting roller 22, the pressing rollers 19 and 20, and the like. The feed roller 6 repeats forward transfer and reverse transfer by a forward / reverse rotation driving device (not shown), and intermittently transfers the printing material 5 in the cycle shown in FIG. That is, as shown in FIG. 2, the feed F is fed from the start position S1 between the prints P to a position where the next start position S2 has passed a predetermined amount, and then the feed is reversed to reverse feed R to the next start position S2 and then again. Forward rotation start position S
While repeating the cycle from 2 to the next start position S3 to a position after passing a predetermined amount R, F, and reverse rotation R to the start position S3, the material to be printed 5 is repeated.
Are intermittently fed to minimize the margins and prevent wasted paper.

Further, the back tension roller 13 is
It is arranged directly below the guide roller 15 between the impression cylinder 3 and the dancer roller 11, and is designed to be continuously rotated in the direction opposite to the feeding direction of the material to be printed 5, and the material to be printed 5 is fed forward. At the time, that is, when the feed roller 6 rotates forward, it slips,
When the feed roller 6 is rotated in the reverse direction, that is, when the printing object 5 is returned, the printing object 5 is reversely fed and the printing position is accurately adjusted.

The reverse feed time of the material to be printed 5 and the plate cylinder 1,
The reverse rotation speeds of the plate cylinders 1, 2 and the back tension roller 13 and the feed roller 6 are controlled so that the rotation times of the parts of the plate 2 on which the plate 28 is not mounted are the same. The pressing rollers 18 to 20 press the printed material 5 against the back tension roller 13 and the feed roller 6 so that the printed material 5 does not sag, and are pressed by a biasing means such as a spring or a hydraulic cylinder or its own weight. ..

The dancer roller 11 descends when the back tension roller 13 reversely feeds the material to be printed 5, absorbs the slack of the material to be printed 5 and gives an appropriate tension, and raises a predetermined amount when the material to be printed 5 is fed forward. Then it returns to its original position. Further, the dancer roller 12 is in the lowered position when the feed roller 6 rotates in the forward direction, but rises when the feed roller 6 rotates in the reverse direction to enable the sheet 5 to be fed backward.

Reference numeral 31 is a processing device such as a label punching device, which is arranged between the print material take-up reel 8 and the pinch roller 9. FIG. 3 shows an essential part of the second embodiment of the present invention. The difference from the first embodiment is that a screw mechanism 32 and a rotary actuator 33 are adopted as a driving device for the register adjusting roller 22, and the first embodiment is shown. Similar to the example, the rotary actuator 33 is controlled by the control device 27, and the same effect can be expected.

FIG. 4 shows the essential parts of a third embodiment of the present invention.
The difference from the first embodiment is that three fixed position register adjusting rollers 21A, 21B, 21C and one movable register adjusting roller 22 are provided, and the movable register adjusting roller 22 transfers a material 5 to be printed by a hydraulic cylinder 34. The same effect as the first embodiment can be expected in that it is driven in the vertical direction parallel to the direction. The present invention is not limited to the above embodiment, for example, the number of plate cylinders can be arbitrarily increased to perform multicolor printing, and when the plate length is slightly smaller than the plate cylinder circumference, When the length is slightly changed, the material to be printed can be continuously transferred, can be used in a continuous rotary rotary press, and the feed cylinder and back tension roller can be omitted by driving the impression cylinder in conjunction. It is possible.

[0019]

As described above, according to the present invention, a plurality of plate cylinders contacting the impression cylinders are arranged at a constant interval, and each plate cylinder is attached to an object to be printed passing between the plate cylinders and the impression cylinders. In a rotary press adapted to perform printing with the plate mounted on the plate, a register adjusting roller for adjusting the length of the printing material between the contact points of the printing plate and the printing plate provided on the adjacent plate cylinders is provided for each printing plate. Since it is characterized in that it is provided between the cylinders, it is extremely easy to adjust the register when the length of the plate in the rotation direction changes, and it can be performed accurately in a short time. Therefore, the plates can be efficiently exchanged, and the occurrence of wasted paper at the time of color matching can be reduced.

[Brief description of drawings]

FIG. 1 is an overall schematic front view showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an intermittent feeding cycle of a printing material.

FIG. 3 is a front view showing a main part of a second embodiment of the present invention.

FIG. 4 is a front view showing a main part of a third embodiment of the present invention.

FIG. 5 is a perspective view of a plate cylinder.

FIG. 6 is an overall schematic diagram showing a conventional example.

[Explanation of symbols]

 1 plate cylinder 2 plate cylinder 3 impression cylinder 4 impression cylinder 5 substrate 21 register adjusting roller 21A register adjusting roller 21B register adjusting roller 21C register adjusting roller 22 movable register adjusting roller 26 hydraulic cylinder 32 screw mechanism 34 hydraulic cylinder

Claims (3)

[Claims] 1. A plurality of plate cylinders abutting on the impression cylinders are arranged at a constant interval, and printing is performed by a plate attached to each plate cylinder on an object to be printed passing between the plate cylinders and the impression cylinders. In the rotary press, a register adjusting roller for adjusting the length of the printing material between the contact points of the printing plates and the printing materials provided on the adjacent plate cylinders is provided between the printing cylinders. Register adjustment device for rotary press. 2. The register adjusting rollers provided between the plate cylinders are composed of a plurality of rollers in contact with an object to be printed, and the axes of the rollers are arranged in parallel with the axis of the plate cylinder. 2. The register adjusting device for a rotary press according to claim 1, wherein at least one of the rollers is provided so as to be movable in a direction perpendicular to the axis. 3. A register adjusting device for a rotary press according to claim 2, wherein a hydraulic cylinder or a screw structure is used as a driving means for the movable register adjusting roller.