JPS62207647A - Pawl stand raising and falling device of printing cylinder - Google Patents

Abstract

PURPOSE:To enhance operability, by interposing a spring member concentric to a bolt fixing a pawl stand bar to the bottom surface of the notch provided to the periphery of a cylinder between the pawl stand bar and the bottom surface of the notch provided to the periphery of the cylinder to energizing the pawl stand bar to a direction for allowing said bar to be spaced apart from the bottom surface of the notch provided to the periphery of the cylinder. CONSTITUTION:When an impression cylinder 1 and a transfer cylinder are rotated to reverse directions to allow pawls 11 to oppose to each other, the pawls 11 opens and close with respect to a thumb stand 15 by a cam mechanism and the change-over of the biting of paper is performed between both cylinders. When paper has a standard thickness of about 0.04-0.3mm, a bolt 13 is already loosened and a pawl stand bar 12 rises by the repulsive force of a coned disc spring 18 until contacts with the shoulder part 19 of a stopper 19. At this time, a gap (t) is formed between the thumb stand bar 12 and a bottom surface. When the paper is altered, for example, to cardboard with a thickness of 0.3mm or more, if a spanner is inserted from holes 21a, 19d to tighten the bolt 13, not only the pawl stand bar 12 but also the pawl stand 15 are fallen while the coned disc spring 18 is compressed to enable the correspondence to the cardboard. By this method, the operability of the device is enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a printing cylinder such as an impression cylinder of a sheet-fed printing press, in which a claw plate that grips the edge of paper between the claws is arranged in a manner corresponding to the thickness of the paper. This invention relates to a nail platform up and down device that adjusts its movement up and down.

[Conventional technology]

In sheet-fed printing, in addition to the plate cylinder on which the printing plate is attached, there is also an impression cylinder that applies printing pressure between the plate cylinder or blanket cylinder during printing, and the printing paper is attached to the impression cylinder. The end of the paper is held in the gripping claw device, and printing is applied to the surface on the opposite impression cylinder side while being conveyed as the cylinder rotates.

In addition, in a multicolor printing press, a transfer cylinder is provided between the printing units of each color, and the paper is transferred from the impression cylinder to the transfer cylinder, and from the transfer cylinder to the next impression cylinder while being transferred between the gripping claw devices. and can be printed. The above-mentioned gripping claw devices provided on these impression cylinders and transfer cylinders include several claw stands supported by claw stand bars in parallel in the axial direction of the cylinder, and each claw stand. Multiple claws and slits arranged in response to the problem,
By closing the claw against the claw base, the paper is held in the grip between the claw and the claw base.

In such a gripping claw device, generally, for example, 0.0
If the height of the nail base is not appropriate for the wide range of filter paper thickness, such as 4m to 0.6m, the paper may become distorted or not be held when changing the grip, so please check the thickness of the printing paper. If the change exceeds a certain range, it is necessary to move and adjust the nail rest up and down, and for this purpose a nail rest up-and-down device is provided to move the nail rest bar supporting the nail rest up and down.

[Problem that the invention seeks to solve]

However, the conventional claw stand up/down device is adjusted by rotating a rice cam or by rotating a plurality of eccentric bins, and both have complicated structures and are stupid and cannot be provided at low cost. However, there were problems such as low adjustment accuracy and poor operability.

[Means for solving problems]

In order to solve these problems, in the present invention, a spring member that is concentric with the bolt that fixes the nail rest bar to the bottom of the trunk notch is interposed between the nail rest bar and the bottom of the trunk notch. The claw base bar was biased in a direction to separate it from the bottom of the trunk circumferential notch.

[Effect]

When the cylinder rotates, the paper is conveyed with the edge thereof caught between the claws and the claw base. If the paper thickness changes, by loosening the bolt, the claw rest bar will move away from the bottom of the body circumferential notch due to the elastic force of the spring member to accommodate the thick paper, and the bolt will be moved by the elastic force of the spring member. By tightening against this, the claw base bar moves in a direction closer to the bottom of the trunk circumferential notch to accommodate the thin paper.

〔Example〕

FIGS. 1 and 2 show an example in which the printing cylinder claw bed up-and-down device according to the present invention is implemented on an impression cylinder of a sheet-fed printing press, and FIG. 1 shows a partially expanded view of the impression cylinder in which this is implemented. The plan view shown in FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1. In these figures,
A notch 2 having a circumferential angle of 120 degrees is provided on the outer circumference of the impression cylinder 1 over the entire length of the cylinder. is blocked by. Two finished bottom surfaces 4.5 are formed in the cutout 2 over the entire length of the barrel, and a plurality of brackets 6 are bolted to one of the bottom surfaces 4. Reference numeral 7 denotes a pawl shaft rotatably supported by the bracket 6 and the bearers 3 at both ends, and on this pawl shaft 7, a plurality of pawl holders 8 are arranged in parallel at predetermined intervals via spring members. A cam lever 10 with a roller 9 pivotally attached to its free end is attached to a protrusion from the bearer 3 on one side of the supported frame, and a cam lever 10 connects the roller 9 to a cam (not shown) on the frame side. It is mounted on the shaft. A pawl 11 is attached to the tip of each pawl holder 8, and when the impression cylinder 1 rotates, the cam lever 10 swings depending on the height of the cam surface, and all the pawl holders reciprocate at the same time, causing the pawl 11 to rotate. It is configured to open and close with respect to a claw base 15, which will be described later.

Note that the pressing force of the claw 11 against the claw base 15 is absorbed by a spring member provided on the claw holder 8.

On the other hand, on the other bottom surface 5, a nail rest bar 12 having an L-shaped cross section and slightly shorter than the entire length of the notch 2 is inserted into the bottom surface by inserting a plurality of bolts 13 into the hole 14. This nail base bar 12 is fixed by fitting into the screw hole 5.
The claw base 15 formed in the shape of a top is fixed to the notch portion with a bolt in correspondence with the claw 11. Note that there is a play between the bolt 13 and the bolt hole 14, and the claw base bar 12
The horizontal positioning is performed using a plurality of reference bins 16 whose both ends are tightly fitted to the nail rest bar 12 and the bottom surface 5, respectively.
It is carried out by A large-diameter hole 17 is formed on the bottom surface 5 side of the bolt hole 14, and a spring member is provided in the large-diameter hole 17 to bias the pawl bar 12 away from the bottom surface 5. A plurality of disc springs 18 are interposed. Reference numeral 19 denotes a stopper having the same length as the nail rest bar 12 and having an inverted cross section so as to engage with the nail rest bar 12, and has a thick stopper having a finished surface 19a at both ends and the center thereof. A thick portion 19b is formed, and this thick portion 19b
The finished surface 19a is brought into pressure contact with the bottom surface 5 by screwing the bolt 20 inserted into the bolt hole of the bottom surface 5 into the screw hole of the bottom surface 5, and the finished surface 19a is completely fixed. With this configuration, the Fi claw rest bar 12 is normally struck 91 times by the countersunk spring 18 and comes into contact with the shoulder 19C of the stopper 19, creating a gap between it and the bottom surface 5 as shown by the symbol t in the figure. The nail rest 15 is at a high position because it has been raised until it is formed, but from this state, by tightening the bolt 13, the nine disc springs 18 are compressed and the nail rest bar 12 is lowered, and the nail rest 15 is also lowered. . 19d bolt 1
This is the hole for inserting the 3rd spanner spanner. Further, reference numeral 21 denotes a cover for preventing dust, paper powder, etc. from entering around the nail base bar 12, and is provided over the entire length of the notch 2. It is fixed to the base bar 12 and the bottom surface 5. Reference numeral 21a is a socket for inserting a spanner for the bolt 13.

The impression cylinder 11ri configured in this way is in contact with a transfer cylinder (not shown) having the same diameter as the impression cylinder 11ri, for example, and a claw 11 and a claw stand 15 which are arranged between the impression cylinder 1 and the impression cylinder 1 are also provided in the notch of the transfer cylinder. A gripping claw device and a claw platform up/down device are provided. In addition,
The gripper device of the impression cylinder 1 and the gripper device of the transfer cylinder are provided with different phases in the cylinder axis direction.

Due to the structure described above, when the impression cylinder 1 and the transfer cylinder rotate in opposite directions and the claws 11 face each other, the cam lever 10 swings by the cam mechanism, and the claw 11 or the claw stand 15
The paper is exchanged between the mouths of both rivers. In this case, as described above, it is necessary to adjust the movement of the claw base 15 in the distance direction relative to the steel core, that is, in the vertical direction in FIG. 2, according to the thickness of the paper. Figure 2 shows that the paper thickness is 0.04~
In this case, the bolt 13 is loosened and the claw base bar 12 rises until it abuts against the shoulder 19c of the stopper 19 due to the elastic force of the countersunk spring 18. ing. At this time, between the nail base bar 12 and the bottom surface 5,
A gap indicated by the symbol t in the figure is formed. In addition, since the spring constant of the disc spring 18 and the spring constant of the claw opening/closing spring provided on the claw holder 8 are considerably different from each other,
Even if the claw 11 is pressed against the claw base 15 when holding paper, the disk spring 1
There is no way that the sun will succumb to this spring force and be completely compressed.

If the thickness of the paper is changed to a cardboard with a thickness of 0.3 tm or more, for example, when a wrench is inserted through the holes 21a and 19d and the bolt 13 is tightened, the pawl bar 12 countersunk 18.
Since it descends while compressing the paper, and the claw base 15 also descends, it is possible to handle thick paper. When moving the nail rest up and down, the nail rest bar 12 and the bottom surface 5 are positioned by the reference pin 1B, so that they do not slide horizontally.

In this embodiment, the disk spring 18 is used as an example of the spring member that biases the claw base bar 12, but other spring members such as a compression coil spring may be used. Furthermore, although this embodiment shows an example in which the present invention is applied to an impression cylinder of a sheet-fed printing press, the present invention can be similarly applied to any printing cylinder equipped with a gripping claw device, such as a transfer cylinder or paper feed cylinder. I can do it.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the nail rest up-and-down device for printing JM, the nail rest bar is moved from the bottom of the trunk notch in a manner concentric with the bolt that fixes the nail rest bar to the bottom of the trunk notch. A spring member that biases the nail base in the direction of separation is interposed between the nail base bar and the bottom surface of the trunk circumferential notch, and when the bolt is loosened, the nail base is raised by the spring force of the spring member. The structure is such that the claw rest is lowered via the claw rest bar, which is raised and lowered by tightening the bolt against the spring force of the spring member, reducing the number of parts and simplifying the structure, making it cheaper. In addition, all you have to do is tighten and loosen the bolts, which greatly improves operability compared to conventional methods.

[Brief explanation of drawings]

FIGS. 1 and 2 show an example in which the printing cylinder claw bed up-and-down device according to the present invention is implemented in an impression cylinder of a sheet-fed printing press, and FIG. 1 is a partially exploded plan view of the impression cylinder in which this is implemented. , FIG. 2 is a sectional view taken along line AA in FIG. 1. 1...Impression cylinder, 2...Notch, 5...Bottom surface,
12+1@1111 nail base bar, 13.・φ bolt, 1
4＠・-・Bolt hole, 15・・Claw stand, 17・・Choice・・
Large diameter hole, 18... Disc spring.

Claims (1)

[Claims] In a printing cylinder equipped with a nail base bar that supports a nail base and is fixed to the bottom surface of a trunk circumferential notch with a plurality of bolts, the nail base bar is provided between the nail base bar and the bottom surface of the trunk circumferential notch. 1. A device for raising and lowering a pawl base for a printing cylinder, characterized in that a spring member is interposed concentrically with the bolt and biased in a direction to separate the bolt from the bolt.