JPS6271654A - Automatic registering device - Google Patents

Abstract

PURPOSE:To perform automatic registering, by calculating a top-bottom direction registering error, a transverse direction registering error and a twist from a reference signal and two register mark output signals, and moving each plate cylinder so that the calculated values become not more than predetermined allowable values, respectively. CONSTITUTION:For example, each of printing plates P1, P2 in a printing press comprising two plate cylinders 43, 44 is provided with the first register mark 21 in a right-angled rectangular shape at a part on a straight line perpendicular to the moving direction of the printing plates, with one base of the triangle placed on the straight line, and the second register mark 22 in a bar format another part on the straight line, with the front edge of the mark 2 placed on the straight line. The first and second detectors 23, 24 for detecting the first and second register marks 21, 22 concurrently with rotation of plate cylinders disposed adjacently to the plate cylinders 43, 44 and a reference point signal generator for generating a common reference point signal for the rotation of each of the plate cylinders are provided. A controller detects the respective phase differences between the reference point signal and output signals from the first and second detectors, calculates a top-bottom direction registering error, a transverse direction registering error and a twist from the detected phase differences, and moves each of the plate cylinders so that the calculated values become not more than allowable values, respectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an automatic register adjustment device for automatically adjusting the register of a plate in a printing press having a plurality of plate cylinders, such as a multicolor printing press. It is.

[Conventional technology and problems]

In a printing press, if the plates are misaligned or twisted, the printing will be misaligned or distorted, and in multicolor printing, if the phases of each color plate are not completely matched, color misalignment will occur, making it difficult to produce high-quality prints. I can't. Therefore, when printing is performed, a plate is usually set on a plate cylinder, and then so-called register adjustment is performed to adjust the position of the plate. This registration adjustment is performed in the vertical (circumferential direction), left and right, and torsion, but with conventional registration devices, test printing must be performed until the registration is perfectly matched, which results in a considerable amount of defective printed matter, that is, wasted paper. There have been problems in that problems may occur and adjustment requires skill and effort.

This invention was made in view of the above circumstances, and its purpose is to provide an automatic register adjustment device that can automatically adjust the register in the vertical, horizontal, and torsional directions without the need for trial printing. be.

[Means for solving problems]

The automatic register adjustment device of the present invention, which has been made to solve the above problems, overlaps each plate at one location on a straight line perpendicular to the traveling direction of each plate of a printing press having a plurality of plate cylinders. A first register mark in the shape of a right triangle attached to the plate, a second register mark in the shape of a bar attached to another location on the straight line with the front edge overlapped with this, and a second register mark in the form of a bar placed adjacent to each plate cylinder. A first detector and a second detector each detect the first register mark and the second register mark as the cylinder rotates, and a common reference point is set for the rotation of each plate cylinder, and a reference point is set. A reference point signal generator that generates a signal detects the phase difference between the reference point signal and the output signal of each of the first and second detectors, and determines the vertical orientation error, A control device that calculates the left-right direction registration error and torsion, and moves each plate cylinder in the vertical direction, the left-right direction, and/or the torsion direction so that the registration error and the torsion are within a predetermined tolerance value. It is characterized by

[Effect]

In the automatic register adjustment device of the present invention having the above configuration, the control device is configured to detect a vertical direction registration error based on the phase difference between the reference signal and the output signal of the first detector corresponding to the one base of the first registration mark. , the above l of the above first register mark
The horizontal direction registration error is calculated from the phase difference between the output signals of the first detector corresponding to the base and the oblique side, respectively, and the output signal of the first detector corresponding to the first base of the first register mark and the second The torsion is calculated from the phase difference of the output signals of the detectors, and the motor etc. are controlled to move each plate cylinder vertically, horizontally and/or torsionally so that these register errors and torsions are within predetermined tolerance values. move in the direction.

, [Embodiment] Hereinafter, an embodiment in which the automatic register adjustment device of the present invention is applied to a sheet-fed double-sided printing machine as shown in FIG. 4 will be described.

In FIG. 4, a pair of blanket cylinders 40 and 41 arranged above and below are each equipped with plate cylinders 43 and 44 that can be moved into and out of contact with each other. A gripping claw 46 for sheet S is attached to 45, plates P, , P2 are attached to plate cylinders 43 and 44, respectively, and the leading end of sheet S fed from paper feed section 47 is gripped by gripping claw 46. The sheet S is held between the pair of blanket cylinders 40 and 41.
When the sheet S is passed between the two sides, printing is applied to both sides of the sheet S.

9 In each of the above versions P, P2, as shown in Figure 2,
A first register mark 21 and a second register mark 22 are attached, and the first and second register marks 21,22 are detected near each plate cylinder 43,44 as the plate cylinder rotates. A first detector 23 such as a photoelectric switch is placed at a position where
and a second detector 24. The first register mark 21 is a right-angled triangular mark whose base corresponds to a straight line perpendicular to the direction of movement of the plates P, P2, and the front edge of the second register mark 22 is on a straight line. It is in.

Further, each plate cylinder 43.44 is provided with a first detector and a second detector while the first and second register marks 21.22 pass near the first and second detectors 23.24. A register mark gating signal generator 25, such as a proximity switch, configured to generate a gating signal for the output signal is provided and is connected to one of the blanket cylinders, e.g.
includes a reference point signal generator 26 such as a proximity switch that generates a signal indicating a common reference point with respect to the rotation of the two plate cylinders 4 and A4, and a rotary encoder that generates a predetermined number of pulses per rotation. 27 are provided.

The control device for the automatic register adjustment device of this embodiment receives the outputs of the first and second detectors 23, 24, the register mark gate signal generator 25, the reference point signal generator 26, and the rotary encoder 27 as inputs. As shown in FIG. 1, an input isolation circuit 11, a timing logic circuit 12, a gate circuit 13, a counter unit 14, a microcomputer 15, a decoding circuit 16, a port 17,
It is composed of an input card 18, an output card 19, etc., and its register adjustment operation is performed as follows.

tt', when the microcomputer 15 issues a register start command as shown at A in FIG. 3, the apparatus enters the register cycle shown at B in FIG. Register adjustment operations are performed only during this register cycle. Blanket body 40.
41 and plate cylinders 43 and 44 rotate, a constant frequency pulse is supplied from the rotary encoder 27 to the gate circuit 13 via the input isolation circuit 11 for noise cutting, and the reference point signal generator provided in the blanket cylinder 40 26 detects the reference point, the reference point signal shown as C in FIG. 3 is supplied to the timing logic circuit 12 via the input isolation circuit 11, A first gate pulse and a second gate pulse as shown are supplied to the gate circuit 13. The gate circuit 13 allows the reference pulses from the rotary encoder 27 to pass through the counter unit 14 while these gate pulses are being supplied, and each counter of the counter unit 14 starts counting the reference pulses.

On the other hand, as the plate cylinders 43 and 44 rotate, the first register mark 21 and the second register mark 22 are moved to the first detector 2, respectively.
3 and the vicinity of the second detector 24, the register mark gate signal generator 25 supplies the register mark gate signal to the timing logic circuit 12 via the input isolation circuit 11, and the timing logic circuit 12 receives this signal. In response, a register mark gate pulse as shown by D in FIG. 3 is supplied to the gate circuit 13. This gate pulse is used to prevent the device from malfunctioning due to the first and second detectors 23.24 detecting plate-like patterns other than the first and second register marks 21.22. , only while this gate pulse is rising, the first pulse indicated by E and F in FIG.
The detector output and the second detector output are enabled.

When the first detector output E and the second detector output are supplied through the input isolation circuit 11 during the duration of the register mark gate pulse D mentioned above, the timing logic circuit 12 is input to the gate circuit 13. The first gate pulse G and the second gate pulse J are respectively terminated. Therefore, the counter unit 14 detects the reference point signal, that is, from the rising edge of the first gate pulse G and the second gate pulse J to the falling edge of each of these gate pulses.
The count value of the reference pulse by each counter represents the phase difference from the reference point to the leading edge of the first register mark 21 and the second register mark 22.

On the other hand, the first detector output E is the leading edge of the first register mark 21 (
However, since the timing logic circuit 12 supplies the gate circuit 13 with the third gate pulse H that is completely synchronized with the first detector output E, the counter unit 14 The reference pulses are also counted for the duration of the third gate pulse. That is, the number of pulses representing the phase difference between the leading edge and the trailing edge of the first register mark 21 is counted.

Now, as shown in FIG. 3, the vertical registration reference value, that is, the phase difference from the detection of the reference point signal when the vertical error is zero to the leading edge of the first registration mark 21 is converted into the number of reference pulses from the rotary encoder 27. , the actual length of the first gate pulse G (from the rising edge of the reference point signal C to the rising edge of the first detector output E) is 3, and the length of the second gate pulse J (from the rising edge of the reference point signal C) is 3°. If the period up to the rise of the second detector output F is b, then the vertical registration error in terms of pulse number is R1
-a, twist is given by a-b, respectively. In addition, when the left-right registration error is zero, for example, in FIG. If the phase difference between the edges (the pulse width of the third gate pulse 11) is R2, and the actual pulse width of the third gate pulse H is C, then the left and right registration error is given by R2, -c. In the case of Fig. 2, if the plate P1°P2 shifts to the right, the third gate pulse I4
It is clear that the pulse width C becomes shorter, and as it shifts to the left, it becomes longer.

The microcomputer 15 calculates the amount of misregistration in the vertical, horizontal, and torsional directions necessary for position adjustment of the plate cylinders 43 and 44 from the amount of misregistration determined as the number of pulses by the counter unit 14 as described above, and calculates the amount of misregister in the vertical, horizontal, and torsional directions, and outputs the result to the output card. The register adjustment motors attached to the plate cylinders are driven through the cylinders 19 to move the plate cylinders in the respective directions until these register errors become equal to or less than a predetermined tolerance value. The microcomputer 15 uses a decode circuit 16 to reset the counter unit 14 and perform other controls, and starts and stops the target cycle operation of the timing logic circuit 12 via a port 17. Furthermore, when the amount of movement of the plate cylinder for register adjustment exceeds a predetermined mechanical limit value, the limit switch is activated and its output is input to the microcomputer 15 from the input card 18, and the microcomputer 15 Stop the register cycle.

In addition, although the above embodiment has been explained in the case of a sheet-fed double-sided printing press, the automatic register adjustment device of the present invention is applicable to all printing machines having a plurality of plate cylinders, such as a multicolor printing press. .

〔Effect of the invention〕

According to the present invention, register adjustment can be performed automatically without trial printing or special technicians, so the efficiency of printing work is significantly improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a control device of an embodiment of an automatic register adjustment device according to the present invention, Fig. 2 is a plan view showing register marks on a plate, and Fig. 3 is for explaining the operation of the above embodiment. FIG. FIG. 4 is a schematic diagram of an example of a sheet-fed duplex printing machine. 12... Timing logic circuit, 13... Gate circuit, 14... Counter unit, 15... Microcomputer, 21... First register mark, 22...
・Second register mark, 23...first detector, 24...
Second detector, 26...Reference point signal generator, 27...
Rotary encoder, 40. 41... Blanket cylinder, 43° 44... Plate cylinder, P,, P2... Plate, S... Sheet paper patent applicant Hamada Printing Machinery Co., Ltd. Same agent Sickle 1 ) Sentence 2A, Register Start Directive Figure 2,. 1. ,stomach,. Figure 3

Claims (1)

[Claims] 1 perpendicular to the direction of travel of each plate in a printing press with multiple plate cylinders
A first register mark in the shape of a right triangle attached to one place on the straight line with its base overlapped with this one, and a second register mark in the shape of a bar attached to another place on the straight line with its front edge overlapped with this mark. ,
a first detector and a second detector arranged adjacent to the plate cylinders and detecting the first register mark and the second register mark, respectively, as the plate cylinders rotate; a reference point signal generator that generates a reference point signal, and detects the phase difference between the reference point signal and the output signal of each of the first and second detectors. In addition, from these phase differences, the vertical orientation error,
A control device that calculates the left-right direction registration error and torsion, and moves each plate cylinder in the vertical direction, the left-right direction, and/or the torsion direction so that the registration error and the torsion are within a predetermined tolerance value. An automatic register adjustment device characterized by: