JPH0470143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate cylinder phase alignment device for adjusting the phase of each plate cylinder in a multicolor rotary printing press in which a plurality of plate cylinders are arranged around an impression cylinder. It is.

As shown in FIG. 1, in a multicolor rotary printing press in which a plurality of plate cylinders 10 are provided around an impression cylinder 1,
Each plate cylinder 10 is supported so as to be able to approach and move away from the impression cylinder 1, and at a position where the plate cylinder 10 is separated from the impression cylinder 1, the plate cylinder 10 is replaced, and after adjusting the phase of the plate cylinder 10, Printing is performed by bringing the plate cylinder 10 into contact with the impression cylinder 1.

In general, in rotary printing presses, the plate cylinder is supported so that it can move toward the center of the impression cylinder, or it can be supported so that it can move toward an eccentric position of the impression cylinder. In many cases, the latter method of supporting the plate cylinder is adopted for the purpose of downsizing the printing press, and Figure 1 also shows an example in which the plate cylinder is movably supported toward the eccentric position of the impression cylinder. There is.

As shown in FIG. 1, in a rotary printing press in which a plate cylinder 10 is movably supported toward an eccentric position of an impression cylinder 1, the outer diameter of the plate cylinder 10 can be changed by replacing the plate cylinder 10. Then, since the contact position P between the impression cylinder 1 and the plate cylinder 10 changes along the outer periphery of the impression cylinder 1, it becomes necessary to match the phase of each plate cylinder 10 every time the plate cylinder 10 is replaced.

By the way, in the past, the phase of each plate cylinder was roughly matched by the operator's intuition, and then a trial printing was performed, and based on the printing deviation, the deviation of the printing cylinders for the second and subsequent colors was finely adjusted. Moreover, since these adjustments were made manually, it was extremely time-consuming to align the phases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a phase matching device that can automatically adjust the phase of a plate cylinder.

In order to achieve the above object, the present invention includes a detector that detects the printing start position of each plate cylinder arranged around the impression cylinder, and a detector that detects the amount of rotation of each plate cylinder and outputs a signal. a signal generator that generates a signal; a setting unit that uses one of the plurality of plate cylinders as a reference and calculates the amount of phase alignment of the other plate cylinders with respect to the reference plate cylinder based on the diameter of the plate cylinder; and the detector. means for inputting the respective signals from the signal generator and the setting unit based on the detection of the printing start position of each plate cylinder by the means for inputting the respective signals from the signal generator and the setting unit. The operation of the plate cylinder rotation drive device is controlled until the output signal corresponding to the calculation result matches.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Incidentally, since the rotary printing press according to the present invention is the same as the rotary printing press shown in FIG. 1, the configuration of the rotary printing press will be described below with reference to FIG.

A plurality of beds 3 are provided on the side frame 2 that supports the impression cylinder 1, and first to fourth printing units 4', 4'', 4, 4''''' are provided on each bed 3. There is.

Here, the first to fourth printing units 4',
4'', 4, 4''''' have the same configuration, so the first
The configuration of the printing unit 4' will be described below, and the same reference numerals will be given to the same parts for the second printing unit 4'' to the fourth printing unit 4'', and the explanation will be omitted.

The first printing unit 4' supports a plate cylinder support 5 on the bed 3 so as to be movable toward and away from the impression cylinder 1. 10 is rotatably supported, and a roller support 7 is mounted on the upper surface of the plate cylinder support 5.
supported movably in the direction of approach and departure from zero;
The roller support base 7 rotatably supports an anilox roll 8 and a doctor roll 9.

Each of the plate cylinder support stand 5 and the roller support stand 7 is moved by a moving device (not shown), and when each moving device is driven, the plate cylinder 10 moves along with the plate cylinder support stand 5 of the impression cylinder 1. The anilox roll 8, together with the roller support 7, moves towards the plate cylinder 10.

FIG. 2 shows a rotation drive device 11 for the anilox roll 8 and the doctor roll 9. As shown in FIG.

A roll shaft 8' of an anilox roll 8 rotatably supported by a side wall 7' of a roller support 7.
The roll shaft 9' of the doctor roll 9 projects outwardly through its side wall 7', and the roll shaft 8' of the anilox roll 8 has a drive gear 12,
A pawl clutch 13 and driven gear 14 are attached.

The pawl clutch 13 is mounted non-rotatably and slidably in the axial direction with respect to the roll shaft 8', and the drive gear 12 and driven gear 14 are rotatably supported with respect to the roll shaft 8'. 1
The claws 1 on both sides of the claw clutch 13 are attached to the sides of the claws 2 and 14.
Engageable pawls 12' and 14' are attached to 3' and 13'.

On the other hand, on the roll shaft 9' of the doctor roll 9,
First transmission gear 15 meshing with the drive gear 12 described above
and second transmission gear 1 meshing with driven gear 14
6. Furthermore, an electromagnetic clutch 17 is installed.

The first transmission gear 15 and the electromagnetic clutch 17
is supported non-rotatably with respect to the roll shaft 9', while the second transmission gear 16 is rotatably supported with respect to the roll shaft 9'.

In addition, on the roll shaft 9' of the doctor roll 9,
Between the electromagnetic clutch 17 and the second transmission gear 16,
Adsorption cylinder 1 which is excited and adsorbed by the electromagnetic clutch 17
8 is attached so as to be slidable in the axial direction, and has a suction tube 18 and a rotation transmission tube 19 fitted inside the suction tube 18.
The transmission cylinder 19 is attached to the side surface of the second transmission gear 16.

A roll drive motor 21 is arranged on the side of the drive gear 12. This motor 21 is driven only when printing is stopped when the anilox roll 8 is separated from the plate cylinder 10, and when adjusting the phase of the plate cylinder 10. By driving the motor 21, the upper Transmission 2 located in
The drive gear 12 rotates through the drive gear 12, and the pawl clutch 13 is connected to the drive gear 12, thereby causing the anilox roll 8 to rotate.
2 and the first transmission gear 15, the doctor roll 9 rotates.

Further, when the roll drive motor 21 is driven, the electromagnetic clutch 17 attracts and attracts the suction cylinder 18, and the pawl clutch 13 is connected to the driven gear 14, thereby rotating the anilox roll 8 and the doctor roll 9. At this time, the plate cylinder 1 is separated from the impression cylinder 1 due to the movement of the roll support base 7.
The anilox roll 8 is brought into contact with the plate cylinder 10.
By meshing the plate cylinder gear 23 provided at the end of the plate cylinder with the driven gear 14, the plate cylinders 10 can be rotated together, and the phase of the plate cylinders 10 can be adjusted.

As shown in FIGS. 2 and 3, a detection piece 24 is attached to the outer periphery of the side surface of the plate cylinder gear 23, and the detection piece 24 indicates the printing start position of the plate cylinder 10.
4 detection detectors 25 are supported by a bracket 26 attached to the side wall 7' of the roller support stand 7 (see FIG. 4). Further, on the side wall 7', a fourth
As shown in the figure, the bracket 27 is attached,
The bracket 27 supports a pulse signal generator 28 which detects the amount of rotation of the plate cylinder 10 and generates a pulse signal corresponding to the amount of rotation, and this pulse signal generator 28 is connected to the shaft of a gear 29. Further, a gear 29 meshes with a driven gear 14 attached to the roll shaft 8' of the anilox roll 8.

FIG. 5 is a block diagram showing a control circuit of the phase alignment device for the plate cylinder 10 constructed as described above.

Now, in the explanatory diagram shown in FIG.
Let AB be the dimension between the center A of , the size of the plate cylinders 10 of each printing unit 4', 4'' is equal, so AB=AC, and the length of AB is the sum of the radius R of the impression cylinder 1 and the radius r of the plate cylinder 10. can be determined by knowing the radius of the plate cylinder 10.

Also, a straight line passes through the centers B and C of each plate cylinder 10 and extends in the direction in which each plate cylinder 10 approaches and moves away from the impression cylinder 1, and a straight line passes through the center A of the impression cylinder 1 perpendicularly to each straight line. Let the intersection points with the straight line be D and E, respectively,
Let AD be the length of center A and point D, let AE be the length of center A and point E, and further, let straight line AB and center A of impression cylinder 1 be
The angle formed by the horizontal line passing through the center A of the impression cylinder 1 is θ ₁ , the angle formed by the horizontal line passing through the center A of the impression cylinder 1 and the straight line AC is θ ₂ , the angle formed by the horizontal line passing through the center A of the impression cylinder 1 and the straight line AD Let θ ₃ be the angle formed by the horizontal line passing through the center A of the impression cylinder 1 and the straight line AE, then θ ₄ be the angle formed by the straight line AE.
The angle θ ₁ and the angle θ ₂ can be expressed as θ ₁ =θ ₃ −cos ⁻¹ (AD/AB) θ ₂ =θ ₄ −cos ⁻¹ (AE/AC) . At this time, since the angle θ ₃ , the angle θ ₄ , and the lengths of the straight line AB, AC, AD, and AE are constants that can be known in advance, by knowing the radius r of the plate cylinder 10, By applying the values to the above equations and equations, the respective angles θ ₁ and θ ₂ can be determined.

Further, if the points where each plate cylinder 10 of the printing units 4', 4'' contacts the impression cylinder 1 are P and P', and the circumferential length between P and P' is L, then L=2πR×θ ₁ +θ It can be found by ₂ /360°...

Therefore, a case will be described below in which the phase of the plate cylinder 10 of the second printing unit 4'' is aligned with respect to the plate cylinder 10 of the first printing unit 4'.

Now, in FIG. 6, the second printing unit 4''
When the detector 25 for detecting the printing start position is placed on the straight line EC passing through the center of the plate cylinder 10, the circumference from the detection point to the point of contact between the plate cylinder 10 and the impression cylinder 1 is Lz. , a straight line CE passing through the center of the plate cylinder 10
If the inclination angle with respect to the horizontal line XX′ is θ ₅ , then Lz
can be determined by Lz=2πr×180°+θ ₅ −θ ₂ /360°...

Here, θ ₅ is constant, and θ ₂ can be determined using the above formula.

Also, in the case of the first printing unit 4', the circumferential length from the detection point by the detector 25 to the contact point between the plate cylinder 10 and the impression cylinder 1 can be determined in the same manner as described above. That is, in FIG. 6, when the detector 25 for detecting the printing start position is placed on the straight line BD passing through the center of the plate cylinder 10 of the first printing unit 4', the plate cylinder 10 and The circumference up to the point of contact with the impression cylinder 1 is L _Y , and the angle of inclination of the straight line BD passing through the center of the plate cylinder 10 with respect to the horizontal line X ₂ X ₂ ' is θ ₆
Then, L _Y =2πr×180°+θ ₁ −θ ₆ /360... It can be found.

Here, θ ₆ is constant, and θ ₁ can be determined using the above formula.

First, regarding the plate cylinder 10 of the first printing unit 4', which serves as a reference, the circumference _L The printing cylinder 10 is rotated by the circumference L _Y so that the printing start position is located at the point of contact between the printing cylinder 10 and the impression cylinder 1.

Next, regarding the plate cylinder 10 of the second printing unit 4'', the plate cylinder 10 of the first printing unit 4' is the same as the impression cylinder 10.
and the position in contact with the plate cylinder 1 of the second printing unit 4''
Find the circumference of impression cylinder 1 between the positions where zero contacts impression cylinder 1 using the above formula, divide that value by the circumference of plate cylinder 10, calculate the remainder, and calculate the calculated value corresponding to the remainder. Subtract the corresponding dimension from Lz obtained by the above formula, and calculate by the circumference obtained by this subtraction,
From the time when the detection piece 24 is detected by the detector 25, the plate cylinder 10
by rotating the plate cylinder 10 of the first printing unit 4'.
The plate cylinder 10 of the second printing unit 4'' is aligned in phase with respect to the second printing unit 4''.

Therefore, in the control circuit, the circumferential length (or outer diameter dimension) of the plate cylinder 10 is inputted into the setting device 41 of the setting unit 40, and the output signal from the setting device 41 is inputted into the arithmetic unit 42. The amount of phase alignment of the plate cylinder 10 of the second printing unit 4'' with respect to the plate cylinder 10 of the first printing unit 4' is calculated.

Note that a detection signal is inputted from the detector 25 to the counter 43, and based on this signal, a signal corresponding to the above-mentioned alignment amount is read from the calculation section 42, and a pulse signal from the pulse signal generator 28 is inputted. After being reset, comparison or subtraction between the signal corresponding to the amount of phase adjustment and the pulse signal is started, and when these signals match, the motor 2
1 is designed to stop.

The plate cylinders 10 of the third printing unit 4 and the fourth printing unit 4'''' are phase aligned with respect to the plate cylinder 10 of the first printing unit 4' by the same control method as described above.

In the embodiment, the plate cylinder 10 of the printing unit 4' is used as the reference plate cylinder, but one of the plate cylinders 10 of the second printing unit 4'' to the fourth printing unit 4'''' is used as the reference plate cylinder, and the other plate cylinders are used as the reference plate cylinder. Alternatively, the phases of the plate cylinders 10 may be adjusted.

The phase matching device shown in the embodiment has the above structure, and its operation will be explained next.

Now, the plate cylinder 10 is separated from the impression cylinder 1, the plate cylinder 10 is replaced at the position where the anilox roll 8 is separated from the plate cylinder 10, and the anilox roll 8 is brought into contact with the replaced plate cylinder 10. Then, when the roll drive motor 21 is driven with the pawl clutch 13 shown in FIG. rotates, and the driven gear 14 attached to the roll shaft 8' of the anilox roll 8 and the plate cylinder gear 2
3, the plate cylinder 10 rotates.

When the detection piece 24 rotates to the mounting position of the print start position detector 25 due to the rotation of the plate cylinder 10, the detector 25 is activated, and the counter 43 calculates based on the detection signal from the detector 25. A comparison or subtraction between the signal from the unit 42 and the signal from the pulse signal generator 28 is started, and when these signals match, the roll drive motor 21 is stopped by a signal from the counter 43, and each printing unit is The plate cylinder 10 is phased with respect to the reference plate cylinder 10.

Note that after adjusting the phase of the plate cylinder 10, the plate cylinder 10
is moved toward the impression cylinder 1 and held in the printing state shown in FIG.

As described above, according to the present invention, the phase alignment of the plate cylinders of each printing unit can be automatically performed by the simple operation of inputting the circumference of the plate cylinder into the setting device of the setting unit. Printing work can be done efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rotary printing press, FIG. 2 is a plan view of a roll drive section showing an embodiment of a phase alignment device according to the present invention, and FIG. FIG. 4 is a front view of FIG. 3, FIG. 5 is a block diagram showing a method of controlling the above phase alignment device, and FIG. FIG. 3 is an explanatory diagram for determining the circumference between plate rolls. DESCRIPTION OF SYMBOLS 1... Impression cylinder, 10... Plate cylinder, 11... Rotation drive device, 21... Roll drive motor, 28... Pulse signal generator, 40... Setting unit, 41...
...Setter, 42...Calculation unit, 43...Counter.

Claims (1)

[Claims] 1. Multicolor rotary printing in which a plurality of plate cylinders having the same diameter arranged around an impression cylinder are provided so as to be able to approach and move away from the impression cylinder, and each plate cylinder is provided with a rotational drive device for phase alignment. a detector for detecting the printing start position of each of the plate cylinders; a signal generator for detecting the amount of rotation of each of the plate cylinders and generating a signal; , a setting unit that calculates the amount of phase alignment of other plate cylinders with respect to the reference plate cylinder based on the diameter of the plate cylinder; and means for controlling the operation of a rotary drive device for the plate cylinder until the output signal corresponding to the calculation result from the setting unit matches the plate cylinder in a multicolor rotary printing press. phasing device.