JPS62116150A - Automatic plate supply controller for printing press - Google Patents

Abstract

PURPOSE:To prevent a printing plate from being missupplied, by outputting a plate supply starting command with a timing related to the rotational phase of a plate cylinder, retrieving velocity-controlling data from a memory on a time series basis on receiving the command, and controlling the driving of a plate-supplying roller motor on the basis of the data. CONSTITUTION:A reference rotary encoder 8 is connected to a rotary shaft of a plate cylinder 1, whereby a signal Z having one pulse per rotation of the cylinder 1 and a signal A having 240 pulses/in (ppi) on the circumference of the cylinder 1 are derived as the cylinder 1 is rotated. A printing controller 9 calculates a timing required for controlling the feeding of a printing plate 3, based on the signal Z and the signal A, and supplies a motor controller 10 with a plate supply starting command. When the plate supply starting command is supplied from the printing controller 9, data stores in a PROM 12 are retrieved in the order of addresses through an address-controlling part 13 based on the timing reference signal A outputted from the rotary encoder 8, and a pulse train signal having a pulse separation according to a predetermined speed characteristic is outputted to a motor driver 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a J3 self-priming plate system ti++ arrangement for a printing press.

(Prior art and its problems) A plate 00 changing mechanism is arranged on the continuously rotating plate II, and the plate set at a predetermined position is transferred to a predetermined position by a plate feeder 1'' in relation to the rotation of the plate cylinder. In a printing machine that feeds the plate and grips the plate head at a timing of It is necessary to control the plate head to the plate head gripping mechanism with good viscosity.

However, in conventional printing presses, when there is a slight variation in the rotational speed of the plate IBM, there is no control to adjust the timing of plate feeding according to the variation.
As a result, variations occur in the timing of plate feeding in relation to the rotational phase of the plate 11, and the plate is fed out to the plate cylinder at a constant speed with these variations occurring, so that the shop front gripping mechanism can accurately maintain the predetermined position n. There was a problem in that it was not possible to guide the plate well, which could result in a mistake in placing the plate in the store.

(Object of the Invention) This invention was made in order to solve the above-mentioned problems, and therefore, it is an object of the present invention to provide an automatic plate feeding control device for a printing press that can improve plate feeding accuracy.

(Means for Achieving the Object) This invention includes a store gripping mechanism arranged on a continuously rotating plate cylinder, and a plate set at a predetermined position is held in relation to the rotation of the plate cylinder by a plate feeder. An automatic plate feeding control device for a printing press that feeds the plate at a predetermined timing and performs in-store picking, and in order to achieve the above object, generates a first reference signal related to the rotational phase of the #i recording cylinder. means for outputting a plate feeding start command at a predetermined timing in response to the first reference signal; and means for chronologically recalling speed control data from a memory in response to a receiving number of the plate feeding start command. , and control means 111 for controlling the drive of the plate feeding roller motor based on the speed control data.

(Embodiment) FIG. 1 shows a schematic configuration diagram of an automatic plate feeding control device in a printing press, which is an embodiment of the present invention.

As shown in the figure, the plate 1j11 is rotatably attached to a predetermined position on the main body of the printing press (not shown), and is connected to the blanket cylinder (not shown) by a gear or the like, so that the plate 1j11 is rotated by the rotation of the blanket cylinder. It is configured to rotate to zero at a constant speed. An opening 2 is provided in the circumference of the plate cylinder 1, and a positioning pin 4 is provided at a predetermined position in the opening 2, into which a hole 3a formed at the front of the plate 3 is fitted. I for press-contacting the storefront of version 3 engaged with J%Ij
A store-front gripping claw 5 that can freely move F1m is provided. The store gripper 5 is configured to open and close at a predetermined timing in relation to the rotational phase of the plate cylinder 1 by a mechanical mechanism. Further, a plate bottom hook (not shown) is provided in the opening 2, and is configured to operate in relation to the rotational phase of the plate cylinder 1 by a mechanical mechanism. The plate 3 is attached to the plate 181 by holding the shop head by a shop gripping mechanism consisting of a positioning pin 4 and a shop gripping claw 5, and wrapping the central part of the plate around the outer periphery of the plate cylinder 1. This is done by locking the plate bottom hook into a G slot provided at the plate bottom.

On the other hand, a pair of plate feed O-
6 is provided. This plate feeding roller 6 is driven by a pulse motor 7.
However, it is configured to nip from both sides and feed the C plate only when a plate feeding command is given.

Next, the configuration of the control section, which is the key point of this invention, will be explained. As shown in Figure 1, the timing required to control the plate feed speed! ; In order to know the i quasi-signal, a reference rotary encoder 8 is connected to the rotation axis of the plate cylinder 1 (the rotation axis of the blanket cylinder may be 6), and 7 signals of 1 pulse per rotation of the plate Ill 1 are generated, for example. On the circumference of plate cylinder 1, 2
1 version tli with 40 pulses per inch (ppi) A signal
It is derived according to the rotation of 1. this house,
The timing reference signal z is input to the printing control device fa9,
The timing reference signal @A is input to the print control device 9 and the motor control device 10.

The printing control device 9 calculates the timing necessary for plate feeding control of the plate 3 based on the Z signal and the A signal, and issues timing commands such as a plate feeding start command and a plate feeding end command to the motor control device a10. give a signal.

The motor control unit 10 receives a plate feeding start command from the printing control device 9 and outputs a drive signal for the pulse motor 7 to the motor drive device 11, and also outputs a plate feeding end command from the printing control device 9. In response, the motor drive device! ! ? 1
Outputs a stop signal to 1.

To explain in more detail, in the motor control device 10, data for controlling the plate feeding speed of the plate 3 is stored in the PROM1.
Address control is performed based on the timing reference signal A output from the reference low-return encoder 8 when a plate feeding start command is given from the printing control device 9. The data in the PROM 12 is read in address order through the section 13, and a pulse train signal (details will be described later) having a pulse interval corresponding to a predetermined speed characteristic is output to the motor drive device 11.

The motor drive device 11 amplifies the pulse train signal given by the motor control device 10 and drives the pulse motor 7 for operating the plate feeding roller.

Next, the operation of this device is shown in the time chart J3 in Fig. 2.
This will be explained using the operation diagrams shown in FIG. First, before giving a plate feeding command, set the plate 3 so that the front end of the plate 3 is located at point P between the plate feeding rollers 6 and 6 shown in Fig. 3, and operate the printing machine. The plate cylinder 1 is rotated at a constant speed in the direction of the arrow.

Thereafter, a plate feeding command is given by operating a plate feeding button or the like built into the operation panel of the printing press. When this plate feeding command is given, the plate 3 is nipped by the plate feeding roller 6.6, and the plate feeding control operation described below is executed.

First, when the plate cylinder 1 is positioned at a predetermined rotational phase, the reference rotary encoder 8 to 7 signals (see Fig. 2 (a))
is output and given to the print control device 9. middle column system tl
The llH stomach 9 starts counting the A signal based on the time when these two signals are given, and starts counting the A signal at a predetermined time ■1
A start signal is generated with a count value corresponding to (see FIG. 2(b)) and is applied to the motor control device 10. The motor tIIJIIl device 10 is thereby activated and reads out the speed control data stored in the PROM 12 via the address control section 13 based on the A signal from the reference low reencoder 8.

Since this speed &lJ Ill data is the key point of the present invention, it will be explained in more detail using FIGS. 2 and 3. Now, as an example, let us consider the case where plate feeding is performed using a speed curve as shown in FIG. 2(b). In this speed curve, in the acceleration section from the start point S to the point A, the plate 3 is raised to a speed faster than the circumferential speed of the plate cylinder without causing slip between the plate feed roller 6 and the plate head. , is a section necessary for feeding the plate into the plate insertion space 14 between the store gripper 5 and the positioning bin 4 in the open state. Further, the constant speed section from point A to point 8 is a section necessary for moving the plate head into the depths of the plate insertion space 14 at the opposite direction. The deceleration section from point 8 to point 0 is a section necessary for guiding the plate head to a predetermined plate gripping position while preventing it from violently colliding with the back of the plate insertion space. Finally, in the constant speed section from point 0 to point D, the plate head is kept at a predetermined position at the back of the plate insertion space 14 until the opening operation of the store gripper claw 5 is completed, and the store gripper is accurately moved. This is the interval necessary for the operation. Note that the distance to each point (A, C, D) shown on the speed curve in FIG. 2(b) <1
．． 12.13) is P-sada (over-the-counter rank 71) in Figure 3.
1 = 20tnm
, 12=35m, 13=50mm.

FIG. 3 is an explanatory diagram of the operation when plate feeding is executed using the speed curve as described above. Positioning bins 4a, 4b, /IC (not shown) of the plate cylinder 1 indicate respective positions corresponding to the respective points (a, b, c) of the speed curve shown in FIG. 2(b). That is, point a indicates a state in which the store gripping claws 5 are passing over the plate feeding line while being opened.

In addition, at point b, the head of the positioning bin 4b is passing over the plate feeding line, and after this, the plate head is pushed a little deeper into the plate insertion space 14, and the hole provided in the plate head is opened. 3
a is guided to the position of the positioning bin 4b. Also, a score of 0 means that the positioning bottle 4C has entered the hole 3a of the plate 3, and the store gripper 5 is fully seated at the position of the head of the positioning bottle 4C, and when the plate cylinder 1 rotates a little more, the store gripper 5 is completely closed. The plate feed row 56 completes the plate feeding operation.

The data necessary to realize such a speed curve can be obtained as follows. Now, suppose that when one pulse is given to the pulse motor 7, the plate 3 is fed by 0.5 m by plate feeding [1-56].The number of pulses N1 from point 8 to point A is the distance tIi11 of 20 m+ Therefore, there are 40 pulses, and the number of pulses N2 from point A to point C is 12 11
Since 1 is 15 mm, there are 30 pulses, and the number of pulses N3 from point C to point D is j! Since 3-1 is 15#, 30 pieces each are required. These pulse intervals are set gradually narrower from point 8 to point A since this is an acceleration section.
Since points A to 8 are constant velocity sections, set them equally.
From point 8 to point 0 is a deceleration section, so it is set gradually wider, and from point 0 to point D, there is a constant speed section, so it is set narrower again.

The speed control data that generates such a pulse train signal (see FIG. 2 (C)) is stored in the PROM 12,
Print control n device i! ? In response to the plate feeding start command from 9, 1! Based on the signal from the semi-low reencoder 8, the above data is called and given to the motor drive device 11.

The motor drive 1IiJI device 11 amplifies the pulse train signal to drive the pulse motor 7. As a result, the plate feeder [1-ra 6] rotates at a speed corresponding to the pulse train signal, and the plate 3 is fed according to a predetermined speed curve shown in FIG. 2(b).

In this way, when the over-the-counter gripping by the over-the-counter gripping mechanism is completed, the force of the A signal C
Kunt), the printing control device 9 outputs a plate feeding end command, and the motor control device 10 outputs a motor drive wave δ.
A stop signal is output to 11, and plate feeding by plate feeding roller 6 is stopped. After plate feeding of the plate feed roller 6 is stopped, the plate 3 is pulled out following the rotation of the plate II 1 and wound around the plate cylinder 1.

In this way, it is attached to the rotating shaft of plate cylinder 1. 1 quasi L1-
The plate feed roller 6 starts plate feeding based on the 7 signal of the plate 8, and during plate feeding, the plate feeding speed is controlled based on the speed control data from the PROM 12, so that the plate 3 is It is possible to feed the plate to a predetermined position with high accuracy with respect to the cylinder 1, and it is possible to prevent mistakes in store gripping and ensure long-term plate feeding accuracy. Moreover, since the speed control data is read from the PROM 12 based on the Δ signal of the reference row reencoder 8, even if the rotational speed of the plate cylinder 1 changes, the plate feeding speed of the plate feeding roll 6 remains unchanged. The plate feeding accuracy can be further improved by following the change. In addition, version III
When the rotation of the reference rotary encoder 8 is completely constant (for example, it is rotated at a constant rate by another control means), the output of another stable oscillator (for example, a crystal oscillator) is used instead of the A signal of the reference rotary encoder 8. Even if the output of the oscillator used in the control device that controls the rotation of the plate cylinder 1 (plankeller 1 to cylinder) is used, the rotation I of the plate cylinder 1 similar to that of the above embodiment can be achieved.
It becomes possible to achieve control according to the Q phase.

(Effects of the Invention) As described above, according to the automatic plate feeding control device in a printing press of the present invention, JJ Ql related to the rotational phase of the plate cylinder;
Plate feeding is started at a predetermined timing based on the signal, and during plate feeding, the plate feeding speed 1. In order to control α, the plate is accurately fed to a predetermined position on plate II to prevent plate feeding mistakes, and good plate feeding accuracy is achieved.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an automatic plate feeding control device according to an embodiment of the present invention, Fig. 2 is a time block diagram for explaining its control 11iJJ production, and Fig. 3 is a schematic diagram of the above-mentioned control 211.
FIG. 3 is an explanatory diagram of plate feeding operation of the apparatus. 1... Plate cylinder, 3... Plate, 5... Store gripper, 6... Plate feeding roller, 7... Pulse motor, 8... Reference rotary encoder, 9... Printing control n device, 10... Motor control device, 11... Motor drive IJJ equipment, 12... PROM

Claims (2)

[Claims] (1) A plate head gripping mechanism is placed on the continuously rotating plate cylinder,
An automatic plate feeding control device for a printing press that feeds a plate set at a predetermined position at a predetermined timing in relation to the rotation of the plate cylinder by a plate feeding roller to grip the plate head, the device comprising: means for generating a first reference signal related to a rotational phase; means for receiving the first reference signal and outputting a plate feeding start command at a predetermined timing; and receiving the plate feeding start command and outputting a speed from a memory. An automatic plate feeding control device for a printing press, comprising a control means for calling control data in chronological order and controlling the drive of a plate feeding roller motor based on the speed control data. (2) Retrieving speed control data from the memory:
2. The automatic plate feeding control device for a printing press according to claim 1, wherein the control is performed based on a second reference signal consisting of a pulse train output in relation to the rotational phase of the plate cylinder.