JPS63224949A - Offset press - Google Patents

Abstract

PURPOSE:To enable an accurate feed to be easily obtained by enabling a feed of a matter to be printed to be adjusted, by providing a rotary mechanism capable of making a speed variable at which a feed roller is intermittently rotated. CONSTITUTION:A feed roller 9 is suspended to stop feeding a matter to be printed in a contact area where a blanket 5 of a printing mechanism 1 comes into contact with the matter to be printed W. Further, a compensating roller 11 is moved in a direction where the matter to be printed is caused to slacken by a transfer mechanism 12 and the matter to be printed W is pinched between the blanket 5 and an impression cylinder 7. Furthermore, it is pulled by a drawing feed roller 13 to be sent. Then, the feed roller 9 is rotated to supply the matter to be printed W in a noncontact area, and the compensating roller 11 is moved in a direction where the matter to be printed W is pulled by the transfer mechanism 12 and the matter to be printed W which passes through the printing mechanism 1 and the drawing feed roller 13 is pulled back. The matter to be printed W is containously sent by a difference between a rotary distance of the feed roller 9 and a pulling back distance by the compensating roller 11. In that case, a speed of the feed roller 9 is made variable by a rotary mechanism 10 and a feeing amount of the matter to be printed is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an offset printing press, and in particular to a conveying mechanism for a strip of printed matter.

[Conventional technology]

Conventionally, as a printing material transport mechanism of this type of offset printing machine, a gripper capable of holding a belt-shaped printing material is provided on the sending side of the printing mechanism, and the gripper is reciprocated by a crank mechanism to intermittently feed the printing material. A structure is known in which sprockets are formed in parallel in the longitudinal direction, the sprockets are engaged with each other, and the sprockets are intermittently rotated to feed the sprockets intermittently.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned crank feed structure, when setting the feeding amount of the printing material, the machine must be stopped and the amount of swing of the crank must be adjusted, and this work must be repeated multiple times, which requires setup time. In this case, there is a problem that the printing material is too large and deforms, making it impossible to obtain an accurate feed distance and causing printing misalignment.

[Means for solving problems]

The purpose of the present invention is to solve these inconveniences.The gist of the present invention is to provide a plunger attached to the outer periphery of the blanket cylinder from the plate of the rotating plate cylinder with a non-contact area with the belt-shaped printing material. and has a printing mechanism for passing the printing material between the blanket and the impression cylinder and printing in the contact area,
A feeding roller that rotates in the non-contact area is provided on the supply side of the printing mechanism, and a variable speed rotation mechanism that rotates the feeding roller intermittently is provided, and the printed material passes through the printing mechanism in the non-contact area. A compensating roller that can pull back the compensating roller, a moving mechanism that reciprocates the compensating roller, and a drawing roller that can convey the printing material in the contact area on the delivery side of the printing machine tank. An offset printing machine featuring

[Effect]

The strip-shaped printing material passes through a feeding roller, a compensation roller, a printing mechanism, and is passed around a drawing roller, and the blanket cylinder and impression cylinder rotate continuously, and the feeding roller stops at the contact area where the blanket and printing material come into contact. Then, the movement mechanism moves the compensating roller in the direction of sagging the printing material, and the printing material is sandwiched between the blanket and the impression cylinder and further pulled by the drawing roller and sent. In the contact area, the feed roller rotates to replenish the printing material, and the moving mechanism moves the compensation roller in the direction of stretching the printing material, so that the printing material passing through the printing mechanism and the drawing roller is pulled back and fed. The difference between the amount of rotation of the roller and the amount of retraction by the compensation roller The substrate to be printed is continuously fed.

〔Example〕

1 to 4 show an embodiment of the present invention, in which 1 is a printing mechanism including an inking section 2, a rotary plate cylinder 4 having a plate 3 on its outer periphery, a blanket cylinder 6 having a blanket 5 on its outer periphery; It has an impression cylinder 7, a notch 8 on the outer periphery of the blanket cylinder 6, and a contact area θ where the printing medium W and the blanket 5 come into contact.
. and a non-contact area θ.

Reference numeral 9 denotes a feeding roller, which is provided on the feeding side of the printing mechanism 1 so that the printing material W can be sandwiched between the feeding rollers 9.

Reference numeral 10 denotes a rotation mechanism, in which case an AC servo mechanism is adopted, and the feed roller 9 is intermittently rotated at variable speed.

11 is a compensation roller, which is connected to the feeding roller 9 and the printing mechanism 1.
It is provided so as to be able to contact and move the printing material W between the two.

The hill is a moving mechanism that reciprocates the compensating roller 11 in the direction in which the printing material W is sagging and in the direction in which it is stretched, in this case in the vertical direction, and the rising speed is synchronized with the printing speed, and the compensation roller 11 is moved back and forth in the direction in which the printing material W is slackened and stretched, in this case in the vertical direction. It has a structure that applies tension to the printed matter W.

In this case, a constant velocity interlocking mechanism is used.

Reference numeral 13 denotes a drawing roller, which is provided on the delivery side of the printing mechanism 1 so as to be able to rotate continuously, and has a contact area θ on the outer periphery of the drawing roller B.
. It has a suction hole 14 that can suck the printed material W by negative pressure, and the suction hole 14 attracts and transports the printed material W, and in the non-contact area θ, the suction is released and it slides on the outer periphery of the feeding roller 13. This allows the printing material W to be pulled back.

The material to be printed W enters the feeding roller 9 via the rollers 6 and 17, passes through the printing mechanism 1 via the compensation roller 11 and the roller W via the roller roller, and then passes through the printing mechanism 1 via the roller roller n. It is sent out via

Since this embodiment has the above configuration, the blanket cylinder 6,
The impression cylinder 7 and the feeding roller 13 are continuously rotating as shown in FIGS. 1 to 4, and the contact area θ where the blanket 5 and the impression cylinder 7 in FIG. The feeding roller 9 stops to stop feeding the printing material W, and the compensation roller 11 is moved by the moving mechanism.
moves in the direction of slackening the printing material W, and in this case rises, and the printing material W is sandwiched between the blanket cylinder 6 and the impression cylinder 7 and is further pulled and fed by the conveying roller. In the non-contact area θ in FIG. 2 between FIG. 3 and FIG. The printed material W that moves, in this case descends, and passes through the printing mechanism 1 and the transport roller B is pulled back, and the difference between the amount of rotation of the feeding roller 9 and the amount of retraction by the compensation roller The printed material W is continuously In this case, when the feeding roller 9 does not rotate in the non-contact area θ, the printing material W returns by the entire feeding distance, so the amount of rotation of the feeding roller 9 corresponds to the replenishment feed of the printing material W. Therefore, the printing material W can be continuously fed while going back and forth, and the feeding amount can be adjusted by variable speed of the feeding roller 9 by the rotating mechanism 10, and the feeding amount can be accurately determined. can be easily obtained and the work speed can be increased.

〔Effect of the invention〕

As described above, the present invention is capable of continuously feeding the printing material while going back and forth, and by adjusting the feeding roller at variable speed using a rotation mechanism, it is possible to easily obtain an accurate feed m. It is possible to speed up the work.

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram immediately before the start of the non-contact area, FIG. 2 is an explanatory diagram in the middle of the non-contact area, and FIG. 3 is an explanatory diagram just before the start of the contact area. FIG. 4 is an explanatory diagram of the middle of the contact area. W: Printed material, θ: Non-contact area, θ. ... Contact area, 1. Printing mechanism, 3. Plate, 4. Rotating plate cylinder, 5.
Blanket, 6... Blanket cylinder, 7... Impression cylinder, 9
・・Feeding roller, ・・Rotation mechanism, 11.・Compensation roller, ・・Movement mechanism, 13.・Leading roller. 7tlf, m

Claims (1)

[Claims] The printing material is transferred from the plate on the rotating plate cylinder to the blanket attached to the blanket cylinder, which has a non-contact area with the belt-shaped printing material on the outer periphery of the blanket cylinder, and the printing material is passed between the blanket and the impression cylinder to print in the contact area. a printing mechanism, a feeding roller that rotates in the non-contact area on the supply side of the printing mechanism, and a variable speed rotation mechanism that rotates the feeding roller intermittently;
A compensating roller capable of pulling back the printed material passing through the printing mechanism in the non-contact area is provided, a moving mechanism is provided for reciprocating the compensating roller, and the printing material is returned to the output side of the printing mechanism in the contact area. An offset printing machine characterized in that it is configured with a transport roller that can be transported.