JPH0550583A - Under-adjustment indicator and method and device for preventing malfunction during use of automatic plate replacing device - Google Patents

Abstract

PURPOSE:To visually identify whether a vice is returned to a home position in an easy manner to positively prevent a malfunction during the use of an automatic plate replacing device by providing switches to be operated when vices are adjusted and indication parts lighting when the switches are turned ON. CONSTITUTION:In a multi-color printing press, switches 11-14 to be operated when vices are adjusted and indication parts 21-24 lighting when the switches are operated are provided in printing devices for every color. Namely, when the switches 11-14 are operated, the indication parts 21-24 are lighted through contacts 11a-14a. Another contacts 11b-14b of the switches 11-14 are serially connected to an automatic plate replacing device 3. When the position of the vice is to be adjusted, the switch 1 of the appropriate device is operated to light the corresponding indication part 2 to inform an operator that the vice is being adjusted. Furthermore, since an earth circuit is interrupted, the automatic plate replacing device 3 cannot be actuated even when the switch 1 of any of the devices is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing an erroneous operation when an automatic plate changing device for smoothly changing a printing plate from an old plate to a new plate is used in a printing press.

[0002]

2. Description of the Related Art On the outer periphery of a plate cylinder of a printing machine, a notch having a substantially rectangular cross section is provided over the entire length of the cylinder, and a printing plate (hereinafter referred to as a plate) is held in the notch. A plate fixing device consisting of a holding-side vise that holds the side end and a bottom-side plate vise that holds the bottom-side end of the plate that is wrapped around the body after being held by this It is fixed and extends in the trunk axis direction.

In such a printing machine, when the specifications of the printed matter are changed and the plate is replaced with the new plate from the old plate, the vise on the rear side is opened by the turning operation of the cam shaft, and one end of the plate released from the gripper. After the plate cylinder is rotated while holding, the old plate is removed by opening the gripping side vise by rotating the cam shaft and releasing the other end of the plate from the gripper. Thereafter, the opening and closing of the plate vise and the rotating operation of the plate cylinder are repeated in the same manner to mount the new plate. Then, after mounting the plate in the reaction, move the vise to add the plate so that the printing is performed at the predetermined position on the printing paper.
I do.

However, this work must be carried out by manually rotating the cam shaft and rotating the plate cylinder or by operating push buttons, and it is especially laborious to carry out the work while holding the old plate and the new plate by hand. Is extremely heavy and requires skill. Furthermore, the new plate cannot be prepared at the mounting position on the plate cylinder during the printing work, and the removed old plate must be removed from the machine during the plate replacement work, which increases the preparation time. Productivity decreases. Therefore, the applicant of the present application has proposed in Japanese Patent Application No. 1-315380 an automatic plate changing device (a plate holding device of a printing machine) for easily changing plates. This is an old plate holding mechanism that receives and holds the old plate that is ejected by opening the vise on both the grip side and the butt side and rotating the plate cylinder, and a new plate that holds the new plate that is exchanged with the old plate and supplied to the plate cylinder. And a holding mechanism.

According to this structure, when the plate is replaced, the front end portion of the plate holding device, which holds the new plate in advance during the printing operation, is brought into contact with the periphery of the plate cylinder, and then the rear plate When the plate cylinder is stopped at a position where the force opposes the tip of the plate retainer, the gripper side plate vise and the bottom side plate vise are opened to release the grips of the old plate, and then the plate cylinder is rotated almost once. The old plate enters and is held in the plate holding device. Therefore, when the plate cylinder is rotated to make the gripping plate vise face the tip of the plate holding device and the new plate is pushed out, the plate vise closes and one end of the new plate is gripped by the plate vise. After rotating the torso almost once,
Closing the other plate vise completes the installation of the new version.

It is necessary to examine and adjust even a printing machine provided with such an automatic plate changing device, and in recent years, it has become possible to perform registration by a remote controller. In the case of a printing machine equipped with an automatic plate changing device, when the plate cylinder automatically changes plates,
Even if the registration is performed with the remote controller, the vise adjustment is not necessary because it returns to the reference position stored in advance. However, there is a limit to the registration of this device, and when performing registration beyond this amount, it is necessary to manually move the vise as before. In this case, the vise is not automatically returned to the reference position, and therefore the vise is returned to the reference position during automatic plate replacement. When the printing plate is mounted on the plate cylinder, the reference pin provided on the vise is engaged with the hole (having an opening) provided at the edge of the printing plate, and then the vise is closed. I am trying to add a version.

[0007]

However, in the automatic plate changing device, the plate insertion position is predetermined, and when the vise is not at the reference position, the plate is inserted without being engaged with the pin. So, I couldn't add the version surely,
It may damage the printing plate. For this reason, the vise is returned to the reference position, and when the plate is automatically replaced, the vise is also automatically returned to the reference position, so the parts that cannot be registered automatically were manually performed. In this case, it is easy to forget to restore the vise, which causes a problem that the printing plate is easily damaged. In particular, when the operator is changed during the printing work such as three shift work, it is easy to not know whether the vise adjustment has been performed, and it is easy to not know which unit is operated in the multicolor machine. I had.

[0008]

In order to solve such a problem, a first invention comprises a switch operated when performing vise adjustment, and a display section which is turned on when the switch is in an on state. It is a thing. A second aspect of the invention detects that a vise adjustment is being performed, sends a detection signal, and prohibits the operation of the automatic plate changing device while the detection signal is output. is there. A third invention is a switch operated when performing vise adjustment, a detection means for outputting a detection signal when the ON state of the switch is detected, and an operation of the automatic plate changing device when the detection signal is output. And a closing means.

[0009]

[Function] The vise is displayed when the vise is adjusted, and the display is turned off when the vise is returned to the original position. Therefore, when the vise is attached, the vise remains unchanged. You can see that it is in a state.

[0010]

DETAILED DESCRIPTION FIG. 1 is an example of applying the invention to a multi-color press, the printing unit of each color switch 1 ₁ to 1 ₄ when performing adjustment vise, and manipulate it There are provided display units 2 ₁ to 2 _{4 which} are turned on when the display is turned on. 2 and 3 display unit 2 ₁ - by its contacts 1 ₁ a to 1 ₄ a when the switch 1 ₁ to 1 ₄ are the circuit is operated
Corresponding one of 2 ₄ lights up,
Another contact 1 of the switch ₁ 1 ~1 ₄ 1 b~1 ₄ b is connected to the automatic plate exchange apparatus 3 are connected in series. In this case, the automatic plate changing device 3 cannot operate when the earth circuit is cut off.

In the device constructed as described above, when the vise position is adjusted, the switch 1 of the corresponding unit is operated, so that the display section 2 corresponding to the switch is turned on as shown in FIG. Notify that you are adjusting the unit. Then, as shown in FIG.
Does not work because the ground circuit is cut off no matter which unit's switch is operated.

Therefore, the operator does not forget to return the vise position to the original position, and even if the operator takes over due to shift work or the like, the vise position of any unit can be determined by looking at the display section. You can know if you have not restored.

FIG. 4 is a flow chart showing the operation when this operation is carried out by the CPU.
If it is determined that the vise adjustment has been performed in step S1 and it is determined that the vise adjustment has been performed by turning on the switch 1, it is determined that the vise adjustment has ended by turning off the switch 1 as shown in step 101. Wait until detected.
When it is detected that the vise adjustment has been completed, the process waits until an instruction for automatic plate exchange is issued in step 103, and after the instruction is issued, the automatic plate exchange operation shown in step 104 is performed. Even when it is determined in step 100 that the vise adjustment has not been performed, the operations after step 101 are performed.

Although the above embodiments have been described assuming that each unit is provided with a switch and a display, this may be provided on a centralized control board, and the display is such that when the button is pressed, the button itself emits light. You can leave it.

[0015]

As described above, according to the first aspect of the present invention, since the switch that is operated when performing the vise adjustment is provided and the display unit that is turned on when the switch is in the on state, the vise position is returned to the original position. Unless the switch is turned on unless otherwise specified, it is possible to confirm whether or not the vise position has been returned to its original position by looking at the display unit by the display on the display unit.

The second and third aspects of the invention detect that the vise adjustment is being performed, send a detection signal, and perform automatic plate replacement while the detection signal is being output. Since the operation of the device is prohibited, automatic plate exchange cannot be performed when the vise position is not returned, so that inconvenience due to it can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration in which the present invention is applied to a multicolor printing machine.

FIG. 2 is a circuit diagram showing an embodiment of the present invention.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

FIG. 4 is a flowchart showing an operation when the present invention is configured by a CPU.

[Explanation of symbols]

 1 Switch 2 Display 3 Automatic plate changer

Claims (3)

[Claims] 1. A vise adjustment is performed in a vise adjustment display device which indicates that vise adjustment is being performed for registering when an old plate of a printing press using an automatic plate changing device is replaced with a new plate. An in-adjustment display device when using an automatic plate changing device, comprising: a switch operated when performing the operation; and a display unit that lights up when the switch is in an on state. 2. An automatic operation for preventing erroneous operation by displaying an indication that a vise is being adjusted for registering when a printing plate of a printing press using an automatic plate changing device is replaced from an old plate to a new plate. In the erroneous operation prevention method when using the plate changer, the vise adjustment is detected and a detection signal is sent, and the operation of the automatic plate changer is prohibited while the detection signal is output. A method for preventing erroneous operation when using an automatic plate changer characterized by: 3. An erroneous operation at the time of using the automatic plate changing device for preventing an erroneous operation when a vise adjustment for registering is performed at the time of changing a printing plate of the printing press using the automatic plate changing device from the old plate to the new plate. In the prevention device, a switch operated when performing vise adjustment, a detection unit that outputs a detection signal when the ON state of the switch is detected, and an operation of the automatic plate changer when the detection signal is output An erroneous operation prevention device when using an automatic plate changing device, comprising: