JPH0486263A - Metal plate printing device - Google Patents

Abstract

PURPOSE:To stop a rotary head quantitatively at a specified position by provid ing, on a rotary pusher, a drive device which stops and positions an endless track based on a position detection signal from a detector for detecting a posi tion of the rotary head so that the rotary head is set to a specified position corresponding to a length in a metal plate printing direction. CONSTITUTION:In a rotary pusher 3 which rotates synchronized with a printer 2, an endless track 30 rotates due to a drive device 4 through a clutch 32 during normal operation. The endless track is independently driven by a drive device 6 connected to the former through a clutch 33 after the clutch 33 is disconnected during the stoppage for positioning of an impression cylinder 22 on the printer 2. If the rotary pusher 3 stops, the position of a rotary head 31 which moves due to the drive device 6 is detected by a detector 7, and the rotary head 31 stops on the rotary head 31 so that it is set to a specified position, by the operation of the drive device 6. The stop position of the rotary head 31 corresponds to the length of a metal plate (a) in a printing direction. The rotary head can be stopped at a position touching the rear end of the metal plate after setting the metal plate to the impression plate adjusted to point 'A'.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention is applicable to a metal plate printing apparatus, particularly when setting the printing machine side corresponding to the size of the metal plate, when the front part of the impression cylinder reaches a fixed position, the impression cylinder is The rotary pusher that stops and supplies the metal plate to the printing press also relates to a metal plate printing apparatus in which its pusher head stops at a position corresponding to the metal plate.

[Conventional technology]

As shown in FIG. 4, a conventional metal plate printing apparatus 1 that prints on a metal plate includes a plate cylinder 20, a blanket cylinder 21,
It consists of a printing press 2 consisting of an impression cylinder 22, and a rotary pusher 3 in which rotary heads 31 are provided at predetermined intervals on an endless track 30 such as a chain, and a metal plate a placed on the rotary pusher 3, A rotary head 31 on an endless track 30 that rotates in synchronization with the rotation of the impression cylinder 22
The metal plate a is conveyed to the printing machine 2 side at the printing press 2, and the conveyed metal plate a passes between the blanket cylinder 21 and the impression cylinder 22 and is printed. The impression cylinder 22 is provided with a front part 23 against which the front end of the metal plate a sent out from the rotary pusher 3 abuts and positions and holds (holds) the metal plate a. The front part 23 is arranged on the starting end side of the impression cylinder surface in the recessed part of the impression cylinder 22, and in synchronization with the rotation of the impression cylinder, the part forming the front part protrudes, and the metal plate is stopped and held. A device that opens and retreats (the operation is controlled by a cam attached to the axis of the impression cylinder).
The front support part 2 is located at a line -1- about 8 to 15 degrees forward to the line connecting the center of the blanket cylinder 21 and the center of the impression cylinder 22.
3 is located (referred to as point A), the gripping of the metal plate a ends, and the gripping portion is located at the contact point between the plunket cylinder 21 and the impression cylinder 22 (referred to as point B). When it reaches the point, the metal plate is released and the evacuation operation is performed thereafter. Further, it is set so that it starts and starts protruding for front protection at a point of about 6 to 12 degrees forward from the point A (referred to as the 0 point). On the other hand, in the rowcry pusher 3, the front part 2
The rotary head 31 transports the metal plate until it is held at point A, and leaves the metal plate after passing point A.

[Problem to be solved by the invention]

In metal plate printing, due to the characteristics of the sheet to be printed, that is, the characteristics of the metal plate, it is not possible to pass the receiver to the feed chain or wrap it around the cylinder while it is held in the grip of the rotary press. As mentioned above, the metal plate conveyed by the rotary pusher synchronized with the rotation of the impression cylinder is held for a short time by the front part, and when sufficient printing pressure is applied, the metal plate is released. By the way, if there is a change in the size of the metal plate in the metal plate printing apparatus described in 1., the printing process will start from now on when the metal plate is gripped, that is, with the front part positioned at point A. It is necessary to set the metal plate to be used on the feed table (rotary pusher) and adjust it so that the rotary head is positioned at the rear end of this metal plate. However, in conventional printing devices, in order to obtain point A of the impression cylinder, the power is turned off, the impression cylinder is stopped, and the impression cylinder is rotated little by little while checking the movement of the front part to find point A. This work requires two to three people. In addition, when setting the position of the rotary head, after the above-mentioned A point setting is completed, the endless track is manually rotated to move the rotary head and determine its position, which makes the setting work extremely complicated. There was a problem. Therefore, the impression cylinder in the printing machine can be easily moved without the need for manual labor.
The object of the present invention is to make the setting work easier by stopping the rotary head of the rotary pusher at a position corresponding to the metal plate size without requiring manual labor.

[Means to solve the problem]

The present invention has been made in consideration of the problems described in 1.
A printing machine that positions a metal plate at the front of the impression cylinder and prints by passing the metal plate between the impression cylinder and the blanket cylinder, and an endless orbit that rotates in synchronization with the rotation of the impression cylinder. a rotary pusher having a plurality of pusher heads spaced apart from each other, and feeding a metal plate between an impression cylinder and a blanket cylinder of the printing press by forward movement of the pusher heads; changing the rotational speed of the impression cylinder from a predetermined rotational state to a slow rotational state based on a detector that detects a rotational phase of the cylinder and a detection signal that indicates a preset rotational phase position from the detector; a drive means for stopping and positioning the impression cylinder from a slow rotating state to a fixed position based on a phase signal corresponding to a detection signal from the detector; and a driving means for stopping and positioning the endless track so that the rotary head is located at a predetermined position corresponding to the length of the metal plate in the printing direction based on a rotary head position detection signal from the detector. The object of the present invention is to provide a metal plate printing apparatus characterized by the following features, thereby solving the problems described in 1.

[For use]

In the present invention, the rotational phase of the impression cylinder is constantly read by a detector such as a rotary encoder, and when the impression cylinder is stopped, the driving means changes the impression cylinder from a predetermined rotation state to a slow rotation state, and when the impression cylinder is stopped, The impression cylinder is stopped based on the detection signal corresponding to the position of the front abutment portion, and positioning at point A is performed, so that the metal plate can be set at point A. In addition, the rotary head stops at a predetermined position, for example, at a position corresponding to the length of the metal plate to be printed, or at a predetermined distance from that position, and the adjustment of the rotary head to the rear edge of the metal plate is performed quantitatively. becomes.

【Example】

Next, the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 3. It should be noted that the same reference numerals are used for the parts whose configurations overlap with those of the conventional example shown in FIG. 4, and the explanation thereof will be omitted. In the printing press 2 of the metal plate printing apparatus 1, the impression cylinder 22 rotates by receiving a driving force from a driving means 4 which is a main driving source constituted by a servo motor or the like;
Detector 5 consisting of a rotary encoder etc.
The rotational phase of the front cover part 23 is captured by the rotational phase of the front cover part 23, and the position of the front cover part 23 is constantly detected. The drive means 4 has a control section 40 that constantly receives a detection signal corresponding to the position of the front cover part from the detector, and the driving force is adjusted under the control of this control section 40. When stopping the impression cylinder 2, the predetermined rotational state of the impression cylinder is changed to a slow rotational state by the operation of the control section 40, and in this state, braking is applied based on the detection signal to move the front part 23 to A.
Stop at a point. The operation toward stopping the impression cylinder 22 will be explained based on the flow shown in FIG. 2. When the control unit 40 receives the stop+h operation signal, the stop control in the control unit 40 starts from star 1-b.
be done. First, a pulsating rotation C is performed, and during this time, the position detection d of point B, point A, and point 0 is performed by the detector 5.
Pulsatile rotation continues until a predetermined point is detected. When a predetermined point is detected, the speed is changed to a slow rotation up to a predetermined speed. When the position phase f of point A is detected during this slow rotation, the braking g by the driving means 4 is activated, and the front part 23 is stopped when it is located at point A, and this state is maintained until the end i do. As shown in FIG. 1, in the rotary pusher 3 that rotates in synchronization with the printing press 2, a clutch 32 is normally used.
The endless track 30 rotates using the driving means 4 as a driving source. Further, during positioning and stopping work of the impression cylinder 22 in the printing press 2, the clutch 32 is disengaged, and the clutch 32 is disengaged.
It is provided so as to be able to be driven independently by a driving means 6, such as a pulse motor or a servo motor, which is connected through a motor 3. In order to detect the position of the rotary head 31, a detector 7 consisting of a proximity sensor, a limit switch, etc. is provided on the rotary bushing 3. When the rowcry pusher 3 is stopped, the driving means 6
The position of the rotary head 31 that is moving is detected by the detector 7, and the drive means 6 is operated to stop the rotor IJ+head 31 at a predetermined position on the feed table. The stop position of the rotary head 31 corresponds to the length dimension of the metal plate a in the printing direction, and after setting the metal plate against the impression cylinder adjusted at point A, the rotary head is moved to It can be stopped at a position touching the rear end (the length dimension of the metal plate in the printing direction is a value obtained in advance, and the driving means operates based on that value and the position of the rotary head)
. Alternatively, it may be stopped at a position a predetermined distance away from the rear end of the metal plate. After the rotary head 31 has been positioned, the clutch 33 is disengaged and the clutch 32
is applied, and the row cleaner pusher 3 also begins to operate in synchronization with the rotation of the impression cylinder adjusted to point A. As shown in FIG. 3, the detector 7 of the rotary head 31 can also be composed of a rotary encoder 70 attached to the drive system of the rotary pusher 3, that is, the sprocket 34 and the drive shaft 35. The position of each rotary head 31 is detected by the rotary encoder 70 connected to the system, and the rotary head is stopped at a position suitable for the size of the metal plate when stopped, as described above.

【Effect of the invention】

As described above, according to the present invention, the metal plate printing apparatus positions the metal plate at the front part of the impression cylinder, and prints by passing the metal plate between the impression cylinder and the blanket cylinder. a plurality of pusher heads arranged at regular intervals on an endless track that rotates in synchronization with the rotation of the impression cylinder, and a plurality of pusher heads arranged at regular intervals between the impression cylinder and the blanket cylinder of the printing press by the forward movement of the pusher head. The printing press includes a detector for detecting the rotational phase of the impression cylinder, and a detection signal indicating a preset rotational phase position from the detector. a driving means for changing the rotational speed of the impression cylinder from a predetermined rotational state to a slow rotational state and stopping and positioning the impression cylinder from the slow rotational state to a fixed position based on a phase signal corresponding to a detection signal from a detector; , the rotary pusher comprises:
a detector for detecting the position of the rotary head; and an endless trajectory such that the rotary head is located at a predetermined position corresponding to the length of the metal plate in the printing direction based on a rotary head position detection signal from the detector. and a drive means for positioning the stop. Therefore, if the size of the metal plate to be printed is changed, the A of the impression cylinder may be changed.
Even in the case of point adjustment, the impression cylinder can be stopped so that the front part is at point A without requiring manual labor. Also, with the rotary pusher, it becomes possible to position the rotary head in correspondence with the metal plate without requiring any human effort. Therefore, even if the dimensions of the metal plate to be printed are changed, the adjustment work corresponding to the metal plate in the printing device is greatly simplified, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of a metal plate printing apparatus according to the present invention, FIG. 2 is an explanatory diagram showing a flowchart of stop positioning of an impression cylinder in one embodiment, and FIG. 3 is an explanatory diagram showing a second embodiment. FIG. 4 is an explanatory diagram showing a conventional example. 5...Detector 6...Drive means 7...Detection means

Claims (1)

[Scope of Claims] A printing machine that positions a metal plate at the front part of an impression cylinder and prints by passing the metal plate between the impression cylinder and the blanket cylinder, and that rotates in synchronization with the rotation of the impression cylinder. a rotary pusher having a plurality of pusher heads at regular intervals on an endless track, and feeding a metal plate between an impression cylinder and a blanket cylinder of the printing press by forward movement of the pusher head; The machine includes: a detector that detects the rotational phase of the impression cylinder; and a detection signal from the detector that indicates a preset rotational phase position, and changes the rotational speed of the impression cylinder from a predetermined rotational state to a slow rotational state. and a drive means for changing the speed to a position of the rotary head and positioning the impression cylinder from a slow rotating state to a fixed position based on a phase signal corresponding to a detection signal from a detector, the rotary pusher detecting the position of the rotary head. and a drive means for stopping and positioning the endless track so that the rotary head is located at a predetermined position corresponding to the length of the metal plate in the printing direction based on a rotary head position detection signal from the detector. A metal plate printing device comprising: