JPH0159110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stop position regulating device for an intaglio printing press that always stops the intaglio cylinder at a position where the wiping roller does not come into contact with the intaglio surface.

In an intaglio printing press, a wiping roller is provided that contacts the plate cylinder in order to wipe excess ink from the intaglio surface. In this case, when the machine is stopped, it is undesirable for the wiping roller to stop at a position where it is in contact with the intaglio surface, so such a situation must be avoided. Normally, the wiping roller is driven by a drive source separate from the plate cylinder, so that even if the printing press stops, the wiping roller does not stop for a certain period of time. Therefore, if the intaglio surface is in contact with the wiping roller when the intaglio cylinder is stopped, an accident may occur in which the printing surface or roller surface is damaged by the rotation of the wiping roller.

To avoid such problems, when stopping the printing press, it is necessary to stop the intaglio cylinder at a position where the wiping roller contacts a surface other than the intaglio surface.

For this reason, conventionally, after the machine had stopped, the machine was rotated in small increments while being observed, and the intaglio cylinder was operated to stop when the wiping roller came off the intaglio surface and reached an ineffective position where there was no intaglio surface. . However, such a method has the disadvantage that it is troublesome to operate and has poor productivity.

Another method is to install a timing switch in the switch circuit that stops the machine, and after performing the stop operation, turn off the main motor at a preset timing and simultaneously apply the brake to stop the intaglio cylinder at the desired position. . However, this method has the disadvantage that the stop position of the intaglio cylinder varies due to variations in the load, rotational speed, inertia, and braking force of the machine, and correction work is required each time, which also results in poor productivity.

The present invention was made in order to eliminate such conventional drawbacks, and its purpose is to provide an intaglio printing press in which the intaglio cylinder is always stopped at a position where the wiping roller does not come into contact with the intaglio surface. An object of the present invention is to provide a stop position regulating device.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a block diagram of a dry offset intaglio printing machine equipped with an embodiment of the stop position regulating device of the present invention;
Figure 2 is a partially enlarged view. In FIG. 1, a sheet of paper is fed to a registration section by a feeder 1 and is delivered to an impression cylinder 3, which is a quadruple cylinder, by a swing device 2. On the other hand, the ink supplied from the dry inker 4 to the dry plate cylinders 5a, 5b, 5c, and 5d is transferred onto the plate surface of the quadruple blanket cylinder 6 by the dry plate cylinders 5a to 5d. Further, the ink supplied from the concave inker 7 to the concave inks 8x, 8y, and 8z is transferred onto the intaglio surface of the quadruple intaglio cylinder 9 by the concave inks 8x to 8z. In addition,
10 is a main motor for driving the printing press, and 11 is a wiping roller. Here, the paper wound around the impression cylinder 3 is pushed by the blanket cylinder 6 to perform offset printing, and then pushed by the intaglio cylinder 9 to perform intaglio printing. The printed paper on which both sides have been printed is transferred to the paper take-up cylinder 12.
After being delivered to the chain 13, the paper is held in the jaws of the chain 13 and conveyed to the delivery 14, where it is discharged into a predetermined pile. Since the impression cylinder 3, blanket cylinder 6, and intaglio cylinder 9, which are interlocked with each other, are quadruple cylinders, four sheets of paper are printed when each cylinder rotates once.

In FIG. 2, an intaglio surface 9a having a concave portion where ink accumulates is formed on the circumferential surface of an intaglio cylinder 9, and a cutout-shaped ineffective surface 9 other than this intaglio surface 9a is formed.
It's becoming b. A wiping roller 11 is in contact with the circumferential surface of the intaglio cylinder 9, and the wiping roller 11 is rotated in the direction of rotation of the intaglio cylinder 9 in order to remove excess ink that has adhered to areas other than the concave portions of the intaglio surface 9a. It is adapted to be rotated by another electric motor in the opposite direction.

The lower part of the wiping roller 11 is soaked in a cleaning liquid 16 contained in a container 15, and the peripheral surface to which ink has adhered due to wiping is cleaned by a brush 17, and then the deposits are scraped off by a scraper 18, so that it is always clean. In this state, it comes into contact with the intaglio surface 9a. The wiping roller 11 is made by coating the peripheral surface of a rubber roller with a thin resin film of about 1 mm. When the intaglio cylinder 9 stops with the wiping roller 11 in contact with the intaglio surface 9a, the rotation of the wiping roller 11 stops. Therefore, when the intaglio cylinder 9 is stopped, the stopping position of the intaglio cylinder 9 is adjusted so that the wiping roller 11 faces the ineffective surface 9b, as shown in FIG. 2.

Next, the stop position regulating device will be explained.

FIG. 3 is a layout diagram of the timing sensor. In the figure, 20 is a rotating shaft of the impression cylinder 3, and this rotating shaft 20 has four protrusions 21a, 21b, 21c,
A detection body 21 having a diameter 21d is fixed. A timing sensor 22 consisting of a proximity switch is arranged near the rotational orbits of the protrusions 21a to 21d, and a timing signal is output every time the protrusions 21a to 21d pass nearby and is taken out from the lead wire 22a. . Since the impression cylinder 3 is a quadruple cylinder, four sheets are printed in one rotation.
Therefore, the timing signal is output at the timing when one sheet of paper is printed.

FIG. 4 is a block diagram of the control circuit. In the figure, 23 is a stop command circuit, and when the printing press is stopped in a situation other than an emergency, for example, after printing is finished or when incorrect paper feeding is detected, when a push button is operated, this stop command circuit 23 is activated. The "H" level command signal is continuously output. When this command signal is input, the AND gate 24 is turned on, and the timing signal output from the timing sensor 22 is input to the preset counter 25 via the AND gate 24.

If you stop the machine immediately after the command signal to stop the printing machine is issued, the printing paper held in the chain 13 will stop in that state. The shift action is performed by the function of the preset counter 25. Therefore, the preset counter 25 is preset with the number of times the printing paper printed on the impression cylinder 3 is sequentially fed until it is delivered by the delivery 14, that is, the number of timing signals output during that time. has been done.

Preset counter 25 from AND gate 24
The timing signal inputted to the counter 25 is counted here, and when the preset number is reached, the output of the preset counter 25 becomes "H" and a count-up signal is sent out. Although not shown in the figure, the operation of transferring the paper from the swing device 2 to the impression cylinder 3 stops at the same time as the command signal is sent, so the operation from the time the command signal is sent until the count-up signal is sent is stopped. During this time, all printing paper on the printing machine is discharged.

The count-up signal enters the deceleration command circuit 26, from which a deceleration signal is sent out, and the AND gate 27 is turned on.

28 is a motor control circuit that controls the operation of the main motor 10, and when a deceleration signal is input, the main motor 1
The rotation speed at 0 is the rotation speed during normal operation, for example 140r.
Low stop start speed from pm, e.g. 45r.p.
Significantly reduce speed to m. When the main motor 10 decelerates to this stop starting rotation speed, it continues to rotate at that rotation speed thereafter.

On the other hand, the rotation speed of the main motor 10 is measured by the tachometer 29.
is detected and input to the speed detection circuit 30. A stop start rotation speed is set in advance in this speed detection circuit 30, and when the rotation speed of the main motor 10 reaches this stop start rotation speed, its output becomes "H" and a stop signal is output. This stop signal is input to the AND gate 27, but since the AND gate 27 has already been turned on by the count-up signal, it outputs this stop signal as is.
The AND gate 31 is in a gate-on state. The gate-on AND gate 31 outputs the next timing signal when it is input from the timing sensor 22, and the motor control circuit 28 is activated by the output signal to stop energizing the main motor 10. Cut off. At the same time, the main motor 10 is controlled by the brake signal output from the output circuit 32.
The brake 33 acts on the main motor 10, which is rotating at the stop start rotation speed, to stop within a predetermined short time.

When the traction motor 10, which is rotating normally at high speed, is de-energized and braked to stop it from a high-speed state, the stopping position will fluctuate due to variations in load and inertia, but it will continue to rotate at a low speed at which it starts to stop. When the main electric motor 10 is stopped from a low speed state by applying the brake and stopping the main motor 10 from a low speed state, it is possible to stop the main motor 10 at a substantially constant position even if there are variations in load or inertia.
The number of times the intaglio cylinder 9 rotates after the timing signal is transmitted before it stops is determined experimentally.
Since the generation timing of the timing signal and the rotational position of the intaglio cylinder 9 correspond accurately, and the rotational positions of the intaglio cylinder 9 and the main motor 10 also correspond accurately, the position of the timing sensor 22 can be adjusted to determine the timing generation timing. If set appropriately, it becomes possible to always keep the stop position of the intaglio cylinder 9 at a constant position. Therefore, even if there are variations in load or inertia, the intaglio cylinder 9 can always be stopped at a position where the ineffective surface 9b faces the wiping roller 11.

Furthermore, since all of the printing paper is ejected before the machine stops, the problem of wasted paper is eliminated.

Although the above explanation has been given using an example of a dry offset intaglio printing machine, the present invention can be applied to any intaglio printing machine. Further, although the timing sensor is provided on the impression cylinder, it can also be provided on the intaglio cylinder.

As described above, according to the stop position regulating device for an intaglio printing press according to the present invention, the intaglio cylinder can always be stopped at a position where the intaglio surface does not come into contact with the wiping roller, thereby preventing damage to the intaglio surface and the roller surface. Good quality printed matter can be obtained. In addition, the device has a simple configuration and stable operation.
It also has many effects, including fewer breakdowns.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dry offset intaglio printing machine equipped with an embodiment of the stop position regulating device of the present invention;
FIG. 2 is a partially enlarged view, FIG. 3 is a layout diagram of a timing sensor, and FIG. 4 is a block diagram of a control circuit. 3...Impression cylinder, 6...Rubber cylinder, 6...Intaglio cylinder, 9
a... Intaglio surface, 9b... Ineffective surface, 10... Main motor, 11... Wiping roller, 13... Chain, 14... Delivery, 21... Sensing object, 21
a to 21d... Protrusion, 22... Timing sensor, 23... Stop command circuit, 24, 27, 31...
...and gate, 25...preset counter,
26...Deceleration command circuit, 28...Motor control circuit, 29...Tachometer, 30...Speed detection circuit, 33...Brake.

Claims (1)

[Scope of Claims] 1. A stop command means that sends a command signal when the printing press is stopped; and a fixed timing that corresponds to the rotational position of the ineffective surface of the intaglio cylinder in synchronization with the rotation of the intaglio cylinder of the printing press. A timing sensor that generates a timing signal at a timing sensor, a preset counter that receives an AND output of a command signal and a timing signal, and outputs a count-up signal when a preset number of timing signals has been counted, and an input for the count-up signal. a deceleration command means for outputting a deceleration signal by a deceleration signal; and a motor control means for decelerating a main motor that drives a printing press by a deceleration signal and cutting off current of the main motor by a cut-off signal. and a speed detection means that outputs a stop signal when the rotational speed of the main motor decreases to a predetermined low speed setting value; and a first AND means that outputs a stop signal based on an AND condition of the count-up signal and the stop signal. , a second AND means that outputs a burnout signal based on the AND condition of the stop signal outputted from the first AND means and the timing signal; and a second AND means that operates simultaneously with the output of the burnout signal and applies a brake to the printing press. and a means for stopping the intaglio cylinder by applying the intaglio cylinder, and the timing sensor is characterized in that the timing sensor outputs the timing signal at a timing to stop the intaglio cylinder so that the ineffective surface of the intaglio cylinder comes to a position of the wiping roller that contacts the intaglio cylinder. Stop position regulating device for intaglio printing presses.