JPH0796291B2 - Metal plate printing equipment - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a metal plate printing apparatus, and particularly when setting the printing machine side corresponding to the metal plate size, the impression cylinder stops when the front contact part of the impression cylinder reaches a fixed position, and A rotary pusher for supplying a metal plate also relates to a metal plate printing apparatus whose pusher head stops at a position corresponding to the metal plate.

[Prior art]

As shown in FIG. 4, conventionally, a metal plate printing apparatus 1 for printing on a metal plate includes a plate cylinder 20, a blanket cylinder 21, and an impression cylinder.
Printing machine 2 consisting of 22 and endless tracks such as chains
A rotary pusher 3 provided with rotary heads 31 at predetermined intervals on a metal plate a disposed on the rotary pusher 3, and the rotary head 31 of the endless track 30 rotating in synchronization with the rotation of the impression cylinder 22. Is conveyed to the printing machine 2 side, and the conveyed metal plate a is the blanket cylinder.
Printed through between 21 and impression cylinder 22. The impression cylinder 22 is provided with a front contact portion 23 for positioning and holding (holding) the metal plate a sent from the rotary pusher 3 by abutting the front end of the metal plate a. And this front contact portion 23 is arranged on the impression cylinder surface starting end side in the concave portion of the impression cylinder 22, and in synchronization with the rotation of the impression cylinder, the front contact portion constituent member protrudes, receives the metal plate, holds, opens,
Retracting movement (the movement is controlled by a cam attached to the axis of the impression cylinder), and the center of the blanket cylinder 21 moves forward about 8 lines with respect to the line connecting the center of the impression cylinder 22. When the front contact portion 23 is positioned on the line of ~ 15 ° (referred to as point A), the holding of the metal plate a is completed, and the blanket cylinder 21 contacts the impression cylinder 22 (referred to as point B). The metal plate is opened at the time when the gripped portion reaches, and then the retract operation is performed. Further, it is set so as to start and project from the point A forward about 6 to 12 ° (referred to as point C) for front contact. On the other hand, in the rotary pusher 3, the front pad 23
The metal plate is conveyed by the rotary head 31 until it is held at, and is separated from the metal plate when the point A is passed.

[Problems 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 cannot be delivered to the feed chain or wound around the cylinder in a state of being held by the jaws of the rotary press. As described above, the metal plate conveyed by the rotary pusher synchronized with the rotation of the impression cylinder is held at the front contact portion for a short time, and the metal plate is opened when sufficient printing pressure is exerted. By the way, when the size of the metal plate or the like is changed in the metal plate printing apparatus, when the metal plate is caught,
In other words, it is necessary to set the metal plate to be printed from now on the feed table (rotary pusher) with the front contact part at point A, and adjust so that the rotary head is located at the rear end of this metal plate. There is. However, in the conventional printing apparatus, in order to obtain the point A of the impression cylinder, the impression cylinder is stopped by turning off the power, and the impression cylinder is rotated little by little while checking the movement of the front contact portion to obtain the point A. , Two to three people are needed for this work. Also, in the position setting of the rotary head, after the above-mentioned point A setting is completed, the rotary head is moved by manually rotating the endless track to determine the position, which makes the setting work very complicated. There was a problem. Therefore, without needing to obtain an impression cylinder for a printing machine,
The object is to stop at a point and also to stop the rotary head of the rotary pusher at a position corresponding to the size of the metal plate without requiring manpower, and to facilitate the setting work.

[Means for Solving the Problems]

The present invention has been made in view of the above problems, and a printing machine for positioning a metal plate at a front contact portion of an impression cylinder and printing the metal plate between the impression cylinder and the blanket cylinder, A plurality of pusher heads are arranged at regular intervals on an endless track that rotates in synchronization with the rotation of the impression cylinder, and a forward movement of the pusher head causes a metal plate to be directed between the impression cylinder and the blanket cylinder of the printing machine. The printing machine comprises a rotary pusher for supplying the rotary pusher and a detector for detecting the rotational phase of the impression cylinder, and the rotation of the impression cylinder based on a detection signal indicating a preset rotational phase position from the detector. The speed is changed from the predetermined rotation state to the slow rotation state,
Based on the phase signal corresponding to the detection signal from the detector,
A driving means for stopping and positioning the impression cylinder at a fixed position from a low speed rotation state, and the rotary pusher, based on a detector for detecting the position of the rotary head, and a rotary head position detection signal from the detector, The rotary head is provided with a drive unit that stops and positions 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. This is to solve the problem.

[Work]

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 fine speed rotation state, and when stopped, The impression cylinder is stopped based on the detection signal corresponding to the front contact portion position, the positioning is performed at the point A, and the metal plate can be set at the point A. In addition, the rotary head stops at a predetermined position, for example, a position corresponding to the length of the metal plate to be printed or a position separated from the position by a predetermined distance, and the adjustment of the rotary head with respect to the rear end of the metal plate is quantitative. Becomes

【Example】

Next, the present invention will be described in detail based on the embodiments shown in FIGS. 1 to 3. The parts having the same configurations as those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. In the printing press 2 of the metal plate printing apparatus 1, the impression cylinder 22 receives a driving force from a driving unit 4 which is a main driving source composed of a servomotor or the like and rotates, while the impression cylinder 22 is rotated with respect to the impression cylinder 22. A detector 5 such as an encoder is attached to detect the rotation phase of the front contact portion 23.
The position of the front contact portion 23 is constantly detected. The drive means 4 has a control unit 40 which constantly receives a detection signal corresponding to the front contact portion position from the detector, and the drive force is adjusted under the control of this control unit 40. Then, when the impression cylinder 2 is stopped, the predetermined rotation state of the impression cylinder is changed to the slow speed rotation state by the operation of the control unit 40, and in this state, braking is operated based on the detection signal so that the front contact portion 23 becomes the point A. To stop. The operation for stopping the impression cylinder 22 will be described based on the flow shown in FIG. When the control unit 40 receives the stop operation signal, the stop control in the control unit 40 is started. First, warming rotation c is performed, during which the detector 5 performs position detection d at points B, A, and C, and warming rotation is continued until a predetermined point is detected. When the predetermined point is detected, the speed e is changed to a low speed rotation up to the predetermined speed. When the position phase of the point A is detected during this slow speed rotation, the braking g by the driving means 4 is actuated, and when the front contact portion 23 is located at the point A, it is stopped h, the state is held and the process is finished i. To do. As shown in FIG. 1, in the rotary pusher 3 that rotates in synchronism with the printing machine 2, the endless track 30 normally rotates using the driving means 4 as a driving source via the clutch 32. The clutch 32 is disengaged when the positioning of the impression cylinder 22 in the printing machine 2 is stopped, and can be independently driven by the driving means 6 including a pulse motor and a servomotor connected via the clutch 33. The rotary pusher 3 has a rotary head.
A detector 7 including a proximity sensor and a limit switch is provided to detect the position of 31. When the rotary pusher 3 is stopped, the drive means 6 is used.
The position of the rotary head 31 moved by is detected by the detector 7, and the rotary head 31 is stopped at a predetermined position on the feed table by the operation of the driving means 6. The stop position of the rotary head 31 corresponds to the length dimension of the metal plate a in the printing direction,
After setting the metal plate on the impression cylinder adjusted at point A, the rotary head can be stopped at a position in contact with the rear end of the metal plate (the length of the metal plate in the printing direction is obtained in advance). Value, the drive means operates based on the numerical value and the position of the rotary head). Further, it may be stopped at a position separated from the rear end of the metal plate by a predetermined distance. After the rotary head 31 is positioned, the clutch 33 is disengaged and the clutch 32 is engaged, and the rotary pusher 3 also operates in synchronization with the rotation of the impression cylinder whose A point is adjusted. As shown in FIG. 3, the detector 7 of the rotary head 31 can be composed of a drive system of the rotary pusher 3, that is, a sprocket 34 and a rotary encoder 70 attached to the drive shaft 35. The position of each rotary head 31 is detected by the connected rotary encoder 70, and the rotary head is stopped at a position suitable for the size of the metal plate when stopped, as described above.

【The invention's effect】

As described above, according to the present invention, the metal plate printing apparatus includes a printing machine that positions the metal plate at the front contact portion of the impression cylinder and prints by passing the metal plate between the impression cylinder and the blanket cylinder. A plurality of pusher heads are arranged at regular intervals on an endless track that rotates in synchronization with the rotation of the impression cylinder, and the forward movement of the pusher head causes the metal to face between the impression cylinder and the blanket cylinder of the printing machine. The printing press comprises a rotary pusher for supplying a plate, and the printing machine comprises a detector for detecting a rotational phase of the impression cylinder, and the impression cylinder based on a detection signal indicating a preset rotational phase position from the detector. Driving means for shifting the rotation speed of the vehicle from a predetermined rotation state to a fine speed rotation state, and stopping and positioning the impression cylinder at a fixed position from the fine speed rotation state based on the phase signal corresponding to the detection signal from the detector. The rotary pusher detects a position of the rotary head, and based on a rotary head position detection signal from the detector, positions the rotary head at a predetermined position corresponding to the length of the metal plate in the printing direction. Drive means for stopping and positioning the endless track as described above. Therefore, even when the impression cylinder A point is adjusted by changing the dimensions of the metal plate to be printed, the impression cylinder can be stopped so as to reach the front contact A point without requiring manpower. Further, even with the rotary pusher, the rotary head can be positioned corresponding to the metal plate without requiring manpower. Therefore, even if the size of the metal plate to be printed is changed, the adjustment work corresponding to the metal plate in the printing apparatus becomes very easy, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a metal plate printing apparatus according to the present invention, FIG. 2 is an explanatory view showing a flow chart of stop positioning of an impression cylinder in the embodiment, and FIG. 3 is a second embodiment. And FIG. 4 is an explanatory view showing a conventional example. 1 ... Metal plate printing device 2 ... Printing machine 22 ... Impression cylinder 23 ... Front contact part 3 ... Rotary pusher 31 ... Rotary head 4 ... Driving means 5 ... Detector 6 ... Driving means 7 ... ... Detection means

Claims (1)

[Claims] 1. A printing machine for positioning a metal plate at a front contact portion of an impression cylinder and printing by passing the metal plate between the impression cylinder and a blanket cylinder; and an endless machine rotating in synchronization with rotation of the impression cylinder. A plurality of pressure heads at regular intervals on the track, and a rotary pusher for supplying a metal plate between the impression cylinder and the blanket cylinder of the printing machine by the forward movement of the pressure heads. Is a detector for detecting the rotational phase of the impression cylinder, and a detection signal for displaying a preset rotational phase position from the detector to change the rotational speed of the impression cylinder from a predetermined rotation state to a very slow rotation state. Drive means for shifting the speed and stopping and positioning the impression cylinder at a fixed position from the low speed rotation state based on a phase signal corresponding to the detection signal from the detector; A detector for detecting the position of the tally head, and based on a rotary head position detection signal from the detector, the rotary head is an endless track so as to be located at a predetermined position corresponding to the length in the printing direction of the metal plate. A metal plate printing apparatus comprising: a driving unit that stops and positions the sheet.