JPS6319150Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for preventing a hand from being caught between rotating cylinders in a rotary printing press.

A rotary printing press is equipped with a plate cylinder on which a printing plate is mounted, and a blanket cylinder whose peripheral surface faces the plate cylinder and onto which the image on the plate is transferred. Bearers, which have a diameter slightly larger than the circumferential surface of the trunk and serve as a reference surface for printing plates and trunk tension, are provided with their circumferential surfaces facing each other. A bearer cover equipped with a bearer wiper is attached to the bearer to protect its peripheral surface, which is important as a reference surface. Also,
On the rotation side of the plate cylinder and the blanket cylinder, a safety bar is provided with both ends supported by bearer covers, and the length is approximately the same as the entire length of the cylinders so that hands are not caught between the cylinders. Among these, the bearer cover is removed when adjusting the contact pressure between the bearers, and the safety bar is removed when the plate is attached to the plate cylinder, making it difficult to wrap the plate and damaging the plate surface. Due to the risk, it will be removed.

However, both the above-mentioned bearer touch adjustment work and plate mounting work are performed while rotating both cylinders, and the standard operation is to perform them while intermittently moving the cylinders, but it is difficult for an expert to do so. This is sometimes done while the barrels are continuously rotating at a low speed, and in this case the safety bar is removed, so it is extremely dangerous as there is a risk that your hand may get caught between the barrels. In particular, this risk cannot be avoided in a B-B type double-sided printing press in which the rotating bit sides of both cylinders serve as operating spaces.

The present invention was developed in view of the above-mentioned points, and includes a pin that is attached to both ends of the plate cylinder and blanket cylinder in the vicinity of the rotary biting part and is slidably biased outwardly by a spring member. A safety bar is supported by a bearer cover and removably constructed, and when the safety bar is removed, a switch is actuated by sliding a push pin supported on a frame outside the bearer cover,
By configuring the plate cylinder and blanket cylinder to be able to rotate only by inching, it is made impossible to perform plate mounting operations with the safety bar removed while the plate cylinder is continuously rotating, thereby improving the work. The present invention provides a safety device for rotary printing presses designed to improve safety. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Figures 1 to 3 show an embodiment of the safety device according to the present invention, and Figure 1 shows a B-B in which this is implemented.
FIG. 2 is a sectional view of the safety bar, and FIG. 3 is an enlarged sectional view of the end of the safety bar. In the drawing, a pair of upper and lower blanket cylinders 1 and 2 are pivotally supported by frames 4 on both sides with bearers 3 provided at both shaft ends facing each other in the printing press. Above and below each blanket cylinder 1, 2, plate cylinders 5 and 6 are drivingly connected to each other by a drive gear at the shaft end. The bearers 3,
7 is formed into a disk shape with the same diameter as the pitch circle diameter of the drive gear. Inside the left and right frames 4, there are L-shaped brackets 8 and 9 and support pins 1.
0 is attached to each cylinder 1, 2, 5, 6 at a position on the paper discharge side of the web 11 running in the direction shown by arrow A in the figure, and attached to these brackets 8, 9 and support pin 10. is bearer cover 12, 13, 1
4 is supported. Bearer cover 1 of these
2 and 14 are each formed into an L-shaped cross section, and concentrically cover the peripheral surfaces of the bearers 3 and 7 on both sides of the plate cylinder 5 and blanket cylinder 1, and the blanket cylinder 2 and plate cylinder 6, and each A bearer wiper 15 is attached to clean the peripheral surface of the bearer as the barrels 1, 2, 5, and 6 rotate. Further, the bearer cover 13 connects the upper and lower bearer covers 12 and 14, is formed concentrically with the bearer 3 of both the rubber cylinders 1 and 2, and covers the peripheral surface thereof.

In FIG. 2, the components indicated by reference numeral 16 are left and right upper bearer covers 12 and left and right lower bearer covers 1.
It is a safety bar supported between 4 and 4, and is supported close to the rotating part of the blanket cylinders 1 and 2 and plate cylinders 5 and 6, which rotate in the directions shown by arrows B and C in FIG. . This safety bar 16 includes a bar body 17 in the shape of a round bar that is slightly shorter than the body length, and insertion holes 17 at both ends of the bar body 17.
It is formed by pins 18 and 19 which are slidably fitted into the a. The pins 18 and 19 have long grooves 2 that engage with the knock pin 20 in the center of the insertion hole 17a.
1 is provided, and a compression coil spring 22 that biases the pins 18 and 19 outward is loaded in the insertion hole 17a. both pins 1
One of the pins 8 and 19 has a shaft end 18a that is supported by the bearer covers 12 and 14 via a bush 23, and has a centrally raised shaft end 18a, and a large diameter part 18b is provided adjacent to the shaft end 18a. It is being Further, the other pin 19 is connected to the bearer covers 12 and 14.
The shaft end 19a is pivotally supported via the bush 24 on the shaft end 19a.
are made to protrude outward from the bearer covers 12, 14, and a large diameter portion 19b is provided adjacent to the bearer covers 12, 14. By doing this, the safety bar 16 moves the bar body 17 toward the pin 18 against the elastic force of the compression coil spring 22 on the pin 18 side, and further holds the large diameter portion 19b of the other pin 19. By compressing the compression coil spring 22 on the pin 19 side,
The pin 19 is configured to come out of the bearer covers 12, 14 and to be detachable from the bearer covers 12, 14. The frame 4 corresponding to the pin 19 side of the safety bar 16 has a
A push pin 2 having a large diameter portion 25a on a protrusion from the
5 is slidably supported via a bush 26, and the protrusion of this push pin 25 inward to the frame 4 is provided by a cylindrical cover 27 with a welded flange 27a screwed onto the frame 4. covered. Furthermore, between the frame 4 and the double nut 28 that is screwed onto the tip of the push pin 25 and can be adjusted forward and backward, there is a compression coil that biases the push pin 25 in a direction in which the tip end surface presses the end surface of the pin 19. Spring 29 is loaded. However, the compression coil spring 29 has a spring constant set to be weaker than the compression coil spring 22 on the pin 19 side, and is configured so that the push pin 25 does not move unless the safety bar 16 is removed from the bearer covers 3 and 7. ing. A limit switch 30 is supported by a bracket 31, covered with a cover (not shown), and fixed to the outside of the frame 4. Normally, the contact is pressed by the large diameter portion 25a of the push pin 25 to open the circuit. , the push pin 25 releases the safety bar 16 and the compression coil spring 2
By moving with an elastic force of 9, the pressure on the contacts is released and the circuit is closed. Then, by opening the circuit, continuous rotation of the blanket cylinders 1, 2 and plate cylinders 5, 6 becomes possible, and by closing the circuit, continuous rotation of both cylinders 1, 2, 5, 6 becomes impossible, and the continuous rotation of the blanket cylinders 1, 2, 5, 6 becomes possible. It is configured so that only inching is possible.

The operation of the safety device configured as above will be explained. During the printing operation, the safety bar 16 is supported close to the rotating part of the plate cylinders 5, 6 and the blanket cylinders 1, 2, so that the web 11 is ejected in the direction of arrow A and the web 11 is ejected from each cylinder 1, 2. Even when the barrels 2, 5, and 6 rotate in the directions of arrows B and C, the hands and the like are not pinched by the barrels 1, 2, 5, and 6. Next, when replacing the plates on the plate cylinders 5 and 6 or replacing the blankets on the blanket cylinders 1 and 2, the bar body 17 of the safety bar 16 is
Move it to the pin 18 side against the elastic force of the compression coil spring 22 on the pin 18 side, and then move the other pin 19
When the pin 19 is moved against the elastic force of the compression coil spring 22 on this side, the pin 19 is moved against the bearer cover 12,
14, so when the safety bar 16 is tilted, the safety bar 16 can be easily detached from the bearer covers 12, 14 because the shaft end 18a of the pin 18 is formed in a convex shape.

With the release of the safety bar 16, the compression coil spring 29, which had been compressed due to the elastic force of the compression coil spring 22, springs up and moves the push pin 25 in the direction of the bearer covers 12 and 14, so that the contact point of the limit switch 30 is released from the pressure of the push pin 5, and the rotation drive circuit for the plate cylinders 5, 6 and the blanket cylinders 1, 2 is switched to a circuit that allows only inching by the push button operation. After removing the safety bar 16 in this way, work such as replacing the plate is carried out, but in this case, as mentioned above, an experienced person or the like continuously rotates the plate cylinders 5, 6 and the blanket cylinders 1, 2 at low speed. Even if an attempt is made to perform work such as mounting a plate, the rotational drive circuit of each cylinder is switched to a circuit that does not allow continuous rotation, so the danger of work due to continuous rotation can be avoided.

These safety devices need to perform their functions whether the user likes it or not, but once they get used to using them, they often become cumbersome to use and have to be removed from the machine. , and are often fixed so that they do not operate. However, according to this embodiment, since the limit switch 30 is covered with a cover and the push pin 25 is covered with a cover 27, in order to remove the safety device, the bearer covers 12 and 14 must be removed, and
Remove the limit switch 30 with the cover,
Since the troublesome work of removing the cover 27 and pulling out the push pin 25 is required, there is no fear that the safety device will be removed, and safety can be ensured.

As is clear from the above explanation, according to the present invention, in a rotary printing press in which the rotating biting side of the plate cylinder and blanket cylinder is the operating side, a spring member is installed near the rotating biting part of the plate cylinder and blanket cylinder. A safety bar having outwardly biased and slidably attached pins at both ends is supported by a bearer cover and removably installed, and when this safety bar is removed, it is supported by a frame outside the bearer cover. By activating the switch through the sliding of the push pin, and by configuring the plate cylinder and blanket cylinder to rotate only in increments, plate mounting work can be carried out with the safety bar removed. Continuous rotation of the plate cylinder and blanket cylinder is automatically disabled during operations such as printing and stretching of blanket cylinders, so it is impossible to completely prevent harm caused by carrying out these operations during continuous rotation. Improves work safety. Furthermore, if the safety device is covered with a cover that is difficult to attach and remove, the safety device will not be intentionally removed, and safety can be ensured.

[Brief explanation of the drawing]

1 to 3 show a safety device for a rotary printing press according to the present invention, and FIG. 1 is a side view of the main part of the printing unit of a B-B type double-sided rotary printing press in which the safety device is implemented, and FIG. 2 is a side view of the main part of the printing unit. 3 is a sectional view of the safety bar, and FIG. 3 is an enlarged sectional view of the end of the safety bar. 1, 2...Rubber cylinder, 4...Frame, 5, 6...
...Plate cylinder, 12, 14...Bearer cover, 16...
Safety bar, 18, 19...pin, 22...compression coil spring, 25...push pin, 29...compression coil spring, 30...switch.

Claims (1)

[Scope of utility model registration request] A pin at both ends is slidably attached and biased outward by a spring member, and a safety bar is supported by a bearer cover and removably installed near the rotating bit between the plate cylinder and the rubber cylinder. , a push pin that is slidably supported on the frame outside the bearer cover and is biased by a spring member so that the tip end surface presses the end surface of the pin; and a push pin that is fixed to the frame side and is attached to the frame when the safety bar is removed. A safety device for a rotary printing press, characterized in that a switch is provided, which is operated by the sliding of the push pin to switch the rotational drive circuit of both cylinders to a circuit that allows only inching.