JPH068409A - Clutch control system in printing machine - Google Patents

Abstract

PURPOSE:To provide a clutch control system in a printing machine capable of closing unit clutches in a short time so as to shorten a starting time for printing operation. CONSTITUTION:At first, unit clutches 1b, 2b, 3b, 4b of print units 1-4 are closed with closing of a main power source. Thereafter, conformity or non-conformity in phases at power side and unit side is compared based on phase information of an encoder 11 for detecting a phase of a line shaft 6 and encoders 1c-4c for detecting phases of plate cylinders 1a-4a, so that only the unit clutches 1b-4b of the print units 1-4 which are not conformed are selectively conformed to the phase at the power side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch control system for a printing machine, and more particularly to rotating each plate cylinder of each color printing unit through a unit clutch, and a line which is a common drive shaft for each printing unit. It is useful when applied to a multicolor printing machine configured to supply a rotational force by a shaft.

[0002]

2. Description of the Related Art A multicolor printing machine has a number of printing units corresponding to each color, and a plate cylinder provided in each printing unit continuously prints patterns, characters, etc. of each color. Is configured. Further, in this type of printing machine, a line shaft, which is one drive shaft that is generally rotated by the drive of a main motor, is configured as a drive shaft common to each printing unit, and transmission is performed by rotation of this line shaft. The unit shaft of each printing unit is rotated via the mechanism, and each plate cylinder is rotated via each unit clutch. That is, each printing unit is configured to be able to select the on / off state of transmission of the driving force on the driving side to the unit side by attaching / detaching a unit clutch included in each printing unit.

At the time of printing by the above printing machine, it is indispensable to maintain the mutual positional relationship of the plate cylinders of each printing unit.

Therefore, the above-mentioned printing machine has phase detection means such as an encoder for detecting the phase of each line cylinder and each plate cylinder. In the conventional clutch control system, the reference phase of each plate cylinder and the line axis are used. The unit clutches are sequentially connected when the reference phase of is matched. That is, when the reference phase of this line axis matches the reference phase of the first printing unit while rotating the line axis, the unit clutch of this printing unit is engaged, and the same operation is repeated thereafter to sequentially The second and subsequent unit clutches are engaged.

In the above-mentioned prior art, since the respective unit clutches are connected independently one by one while matching the phases of the driving side and the unit side, there is a drawback that this connection work takes time.

On the other hand, in the plate cylinder of each printing unit, when the unit clutch is stopped with the clutch disengaged, the inertia and the cam of the plate cylinder exist unless a person intentionally turns the plate cylinder. It does not move freely due to its unique structure. Therefore, in many cases, the unit clutch may be directly engaged when the next printing operation is started after the predetermined printing operation is completed and the main power supply of the printing press is shut off. In this case, of course, it is premised that the plate cylinder has not moved since the end of the previous printing operation, but in many cases, this precondition is satisfied.

In view of the characteristics of the printing machine of this kind as described above, the present invention provides a clutch control system for the printing machine which can shorten the start-up time of the printing work by closing the unit clutch in a short time. To aim.

[0008]

The structure of the present invention that achieves the above object is rotated by the drive of a drive source and detects the line axis which is a common drive axis of a plurality of printing units and the phase of the line axis. A plurality of units for rotating the plate cylinder of each printing unit by the rotational force transmitted through each of the unit clutches while rotating by the rotational force of the line shaft transmitted through each transmission mechanism and the phase detecting unit on the driving side. Is a clutch control system in a printing machine having a unit axis and a plurality of unit-side phase detection means for detecting the phase of each plate cylinder respectively, each of the unit clutch is turned on, then the line axis and the unit by the drive source. While rotating each plate cylinder through the shaft, the output signals of the phase detecting means on the driving side and the phase detecting means on the unit side are compared, and as a result, the phases of both are detected. Engagement is when it detects that it is not in a predetermined relationship, and performing phase adjustment operation.

[0009]

According to the present invention having the above structure, each unit clutch is first engaged on the assumption that the plate cylinder has not moved since the end of the previous printing operation, and then the phase relationship between the driving side and the unit side is changed. Only the unit that does not hold the predetermined phase relationship after being detected is adjusted in phase selectively.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is an explanatory view conceptually showing the structure of a printing machine to which an embodiment of the present invention is applied. As shown in the figure,
This printing machine is a multi-color printing machine having four printing units 1, 2, 3, 4 and each printing unit 1, 2, 3, 4
The plate cylinders 1a, 2a, 3a and 4a provided in the above are configured to sequentially print patterns, characters and the like of each color. Also,
In the printing press, a line shaft 6 which is one drive shaft rotated by the drive of the main motor 5 is configured as a drive shaft common to the printing units 1 to 4, and the transmission mechanism 7 is rotated by the rotation of the line shaft 6. , 8, 9, 10 and unit shafts 1e, 2
The plate cylinders 1a to 4a are rotated via e, 3e, and 4e. That is, each printing unit 1-4
Unit clutches 1b, 2b, 3b included in each,
By attaching / detaching 4b, it is possible to select on / off of transmission of the driving force on the driving side to the unit side. Encoder 1
1 is the phase of the line axis 6 and encoders 1c, 2c,
Reference numerals 3c and 4c are connected to the line shaft 6 or the plate cylinders 1a to 4a so as to detect the phases of the plate cylinders 1a to 4a, respectively.

FIG. 2 is a block diagram showing a control system of the printing machine. In the figure, those parts that are the same as those corresponding parts in FIG. 1 are designated by the same reference numerals, and a overlapping description will be omitted. As shown in FIG. 2, the control unit 12 uses a proximity switch that detects phase information of the line shaft 6 and the plate cylinders 1a to 4a, which are output signals of the encoder 11 and 1c to 4c, and a close switch that detects closing of the unit clutches 1b to 4b. The output information of the arrival detectors 1d, 2d, 3d, 4d is processed to control the attachment / detachment of the unit clutches 1b-4b.

FIG. 3 is a flowchart showing a processing procedure in the control unit 12. The clutch control system according to this embodiment will be described with reference to FIG.

1) When the main power supply is turned on, the unit clutches 1b to 4b are sequentially turned on at intervals of 1 second, the main motor 5 slowly drives the plate cylinders 1a to 4a, and then the phase detection operation is started (process). See blocks 21-30).

2) The phase information of the encoder 11 is compared with the phase information of each of the encoders 1c to 4c, and each plate cylinder 1a to
The unit side reference position which is the reference position of 4a and the line shaft 6
If the driving-side reference position, which is the reference position of, matches, the processing is terminated, and if even one does not match, the phase shift operation is performed (processing block 31,
32, 33, 35, 36 and decision block 34).

3) The unit clutches 1b to 4b of the printing units 1 to 4 whose unit side reference position does not match the driving side reference position are disengaged at the unit side reference position (see processing blocks 37 and 38). After that, the central control panel (operator section) corresponding to the removed printing units 1 to 4
Sounding the buzzer and reducing the number of rotations of the main motor 5 to half the number of rotations of the slow operation (processing block 3
9, 40).

4) At the driving side reference position, the unit clutches 1b to 4b disengaged in 3) are engaged (see processing block 41).

5) The unit clutch 1b of all the printing units 1 to 4 based on the output information of the arrival detection units 1d to 4d.
It is detected whether or not all 4b are in the worn state, and after all the worn states are detected, the rotation speed of the main motor 5 is returned to the rotation speed of slow rotation, and the buzzer ringing of the opester section is stopped. Then, the control is ended (see the judgment block 42 and the processing blocks 43, 44, 35).

In the above embodiment, an example of performing the phase matching operation while rotating the line shaft 6 has been described.
It goes without saying that the printing units 1 to 4 may be provided with a drive source for independent drive, the line shaft 6 may be stopped, and the units that do not match may be driven to perform phase matching.

[0020]

As described above in detail with reference to the embodiments, according to the present invention, each unit clutch is first engaged on the premise that the plate cylinder has not moved since the end of the previous printing operation, and thereafter. Since the phase of only the units that are out of phase with each other is selectively adjusted, the work of engaging the unit clutch can be completed in a short time, and the printing work can be started up quickly.

[Brief description of drawings]

FIG. 1 is an explanatory diagram conceptually showing the structure of a printing machine to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a control system of the printing machine shown in FIG.

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

[Explanation of symbols]

 1, 2, 3, 4 printing units 1a, 2a, 3a, 4a plate cylinders 1b, 2b, 3b, 4b unit clutches 1c, 2c, 3c, 4c 11 encoders 1e, 2e, 3e, 4e unit shafts 6 line shafts

Claims (1)

[Claims] 1. While rotating by the drive of a drive source,
The line shaft, which is a common drive shaft of the plurality of printing units, the phase detecting unit on the driving side that detects the phase of the line shaft, and the rotation force of the line shaft that is transmitted through each transmission mechanism rotate the Clutch in a printing machine having a plurality of unit shafts for respectively rotating the plate cylinders of the respective printing units by the rotational force transmitted through the unit clutches and a plurality of unit side phase detecting means for respectively detecting the phases of the plate cylinders This is a control method, in which each unit clutch is engaged, and then each plate cylinder is rotated by the drive source via the line shaft and unit shaft, and the output of the driving side phase detecting means and the unit side phase detecting means The signals are compared, and as a result, when it is detected that the phase relationship between the two is not a predetermined relationship, a phase matching operation is performed. Clutch control method for printing press.