JPS58224589A - Synchronizing controlling method for rotary unit - Google Patents

Abstract

PURPOSE:To synchronize simply and accurately a reference point by controlling a differential motor so that the phase difference in the waveforms obtained by a sheet feeding starting origin detecting sensor and a reference point detecting sensor of each rotary cylinder becomes zero. CONSTITUTION:Synchronizing control circuits are arranged in respective rotary units, and composed of synchronizing control units SCU1-SCUx of the number corresponding to the number of the rotary units. The units SCU1-SCUx input the prescribed rectangular waves from a sheet feeding starting origin detecting sensor NS0 and cylinder body reference point detecting sensors NS1-NSx, discriminate the direction of the phase difference of the rectangular waves, and controls the differential motor 74 so that the phase difference becomes zero in response to the direction thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronization control method for a rotary unit, and more specifically, for example, a rotary printing machine and a groove cutter combined apparatus installed in a corrugated sheet manufacturing line. The present invention relates to a control method in which reference points individually set for each rotating cylinder can be fully automatically synchronized with high precision in a rotating unit including a plurality of rotating cylinders.

Multi-color rotary printing presses, so-called flexographic printer slotters (combined multi-color rotary printing presses and groove cutting machines) used in corrugated sheet production lines, and other flexographic printer die cutters (combined multi-color rotary printing presses and punching machines) complex device)
In a composite device equipped with a plurality of rotary cylinders of equal diameter all in series, each rotary cylinder has its own reference point relative to its operating bottom dead center, and the rotational cylinders have their own reference points relative to the bottom dead center of their operation, and the It is extremely important that each reference point is accurately synchronized so that each reference point successively reaches the corresponding bottom dead center of the operation in good timing.

However, the units constituting each component of the composite device are configured so that they can be separated from each other for work preparation and inspection, and each cylinder can be used independently for mounting printing plates and die boards, and for adjusting the position of the grooving blade. Since the cylinders can be rotated freely, the relative positions of the reference points of the rotating cylinders will be random when the units are recombined after the above-mentioned setting operations are completed. Therefore, the device cannot be operated in this state, and it is necessary to measure IWIv4 of the series of reference points before operation.

This relationship will be explained with reference to Figure 1.6 In Figure 1,
A typical example of the above-mentioned composite device is a flexographic printer slotter that is suitably used in a corrugated board manufacturing line. The first printing unit 14 and the plate cylinder 16
It basically consists of a second printing unit 18 equipped with a feed line head 20, a creaser unit 22 equipped with a bait line head 20, and a slotter unit 26 equipped with a grooving head 24, and each unit is interconnected. - It can be moved freely via the common rail 28 and the upper wheels 60 so that it can be separated. Then, the plate cylinder 12. The IL, the scoring roll 20, and the grooving disk 24 (strictly speaking, some of these may not be called cylinders, but for convenience, they are also referred to as rotary cylinders below) are provided with respective lower dead ends indicated by b1, b2, b, , and b4, respectively. The printing, lining, and grooving functions are all performed at the dots. Therefore, when the corrugated paperboard sheet 32 on the paper feeder 10 is fed, the leading edge of the sheet 32 reaches the bottom dead end of each rotating cylinder. It is also necessary to adjust the specific reference point of the cylinder so that it also reaches the bottom dead center when the cylinder reaches the bottom dead center. In this specification, the act of activating Sequence 3 to arrive at the right timing is referred to as "synchronizing the reference point." Note that the "reference point" here refers to The tip of the V-tooth 32 is gripped by a pair of paper feed rollers 34 from the paper feed start origin a to the bottom dead center bx of each rotating cylinder. The position returned to is indicated by the symbol P.

As mentioned above, each unit is separated from each other for work preparation and inspection, and each rotating cylinder is rotated independently and then reconnected, so the reference point P of each rotating cylinder is This means that the reference distance from the corresponding bottom dead center deviates, making it impossible to achieve synchronization.

For this reason, conventionally, when each unit was separated, the gear for driving the rotating cylinder of each unit was rotated manually or by an electric motor to set it at a predetermined reference position before being combined, and then the process was performed to combine the units. need. However, since the drive gears are not always set accurately at the reference position, there are cases in which meshing error noise occurs in the series of gear trains after coupling, and complete synchronization is often not achieved. Therefore, it is necessary to supply the sheet many times for trial printing, which requires complicated operations and a lot of time. In addition, when synchronizing with an electric motor, a dedicated electric drive mechanism is required for each unit, which increases manufacturing costs and makes it difficult to implement NC (numerical control) with this mechanism from the operational and accuracy standpoints. It has many drawbacks, such as:

In view of the drawbacks inherent in the reference point tuning control means according to the prior art described above, the present invention has been proposed to solve these drawbacks. , instant high 1t with simple operation
The purpose is to fully synchronize the reference point with tl&.

In order to achieve all of these objectives, the synchronization control method for a rotating unit according to the present invention provides a rotary unit that is equipped with a rotating cylinder that processes a workpiece and a differential mechanism that adjusts the phase of the rotating cylinder. The starting point of supply of the material is detected by a sensor and a pulse signal is obtained.The reference point of the old rotating cylinder is detected by a sensor set at a predetermined reference position to obtain a pulse signal, and the direction of the phase difference between these pulse signals is obtained. The whole feature is that the discrimination is made and the differential mechanism is controlled to rotate fully forward or reverse depending on the direction so as to approach the phase difference sound field.

Next, a method for controlling the synchronization of a rotating unit according to the present invention will be described in detail below by citing preferred embodiments and with reference to all the accompanying drawings. The flexographic printer slotter shown in FIG. 1 will be described as a specific example of a plurality of rotating units in which the control method of the present invention is implemented, but other units may also be used, such as a combined device of a rotary printing press and a punching machine. Of course, it can be suitably applied to a lexo printer die cutter, a rotary printing press combined with a groove cutter and a punching root sound, and a mLy lexo die force slotter that can selectively perform printing groove cutting or printing punching. Furthermore, the control method of the present invention can be applied to existing equipment such as a differential mechanism for phase adjustment of a rotary cylinder (for example, a differential mechanism trademarked as "Harmonic Drive").
However, since most rotary units such as current multicolor rotary printing presses and flexo printer slotters are equipped with the above-mentioned differential mechanism for phase adjustment, the present invention can be applied to There is no concern that the application will be limited.

First, prior to explaining the content of the present invention, a theoretical analysis will be performed with reference to FIG. 2, and an example of a mechanical configuration and a control circuit for implementing the control method will be described.

FIG. 2 is a schematic diagram showing the arrangement of the rotating cylinders of the apparatus shown in FIG. Distance e to the bottom dead center of the plate cylinder of unit 14
827m.

Distance from second printing unit 18 to plate cylinder bottom dead center b2 1tl
l k 1387 mm J'p H7 (7) Cylinder bottom dead center bX of any rotating unit in the front of the supply direction
Assume that the distance to M k X sn. In this case, when the leading edge of the corrugated paperboard sheet 32 in the paper feeder IDvc advances by 827+n from the point a of the paper feed roller 34, the printing reference point P1 of the plate cylinder 12 reaches the bottom dead center and is still at the point a. When the printing reference point P2 of the plate cylinder 16 reaches the bottom dead center b2 when the plate cylinder 16 advances 14587 mm from the point
If the operating reference point PX of the rotating cylinder reaches the bottom dead center bx when moving forward, each reference point P, --ψP
This means that x is in synchronization with amψbx, which is the corresponding bottom dead center. Therefore, on the circumference of each cylinder, ft position P is returned in the opposite direction of rotation by the corresponding distance from the bottom dead center position.
1 * P2 +...middle Px may be used as the operating reference point for each cylinder.

Therefore, when the reference point of Pl/φPx is converted to the rotational phase angle θ of each cylinder, the circumference of each cylinder is 14001111 as described above, so the rotational angle of the plate cylinder 12 is 360×827 0. Se□761--Masu 212.6R
60X1'AB7, Rotation angle θ of 0 plate cylinder 16 1400 Ki356.i!i-3
60Xx Rotation angle θX of any front cylinder = 1400-8
- Therefore, the tip of the cardboard 7-) 32 is the paper feed roller 3.
The differential mechanism of each cylinder may be controlled so that the operation reference points P, . . . In other words, in order to perform this control, the sheet ′
A sensor for detecting that the tip of the sensor 52 has reached point a and a sensor for detecting that the reference point of each rotating cylinder has arrived at the corresponding reference position tr are provided, respectively, and the pulse of the detection signal obtained from each sensor is If you make it match,
Each reference point will be synchronized.

Therefore, an example of sensor arrangement and a control circuit for performing this tuning control will be described next.

In FIG.
An example of the arrangement of a sensor that detects that the paper feeding start point a has been reached is as follows. That is, 32 corrugated cardboard sheets are stacked on the paper feeding table of the paper feeding device 10, a bin 38 eccentrically protruding from the rotary disk 36, and a movement arm 40 held in the bin 38 are used to control the entire crank movement. The sheets 32 are applied and captured by a kicker 42 that repeats horizontal reciprocating motion at an inconstant speed, and are sent out in the direction of the arrow in order from the lowest sheet 32. A pair of upper and lower paper feed rollers 34 are disposed in front of the sheet in the sheet feeding direction, and the tip of the sheet 32 is held in its mouth by the rollers 34 and 34.
e, the starting point during paper feeding is Aa, but this starting point of paper feeding does not necessarily have to be at this Q position, and as shown in FIG.
There is no problem even if it is at point a, which is a distance α ahead of the point. A rotating disk 46 is coaxially fixed to one of the gear trains 44 that drives the paper feed roller 34.
An arcuate protrusion 48 having a central angle of 180 degrees is arranged and fixed at the center. A sensor 50 is disposed close to the rotation locus of the arcuate protrusion 48 . In this case, when the tip of the sheet 32 reaches point a, the tip of the arcuate i 4th point reaches the point 4 in synchronization with this. If the sensor 50 is set to pass in front of the detection head 50, the arrival of the sheet 32 at point a can be detected by the sensor 50.

Although a high frequency oscillation type proximity switch is preferably used as the sensor 50, a magnetic proximity switch (in this case, the arcuate protrusion 4B is made of a magnetic material) or a photoelectric switch may also be used as appropriate. You can also do this. In this way, the signal waveform from the sensor 50 with the arcuate protrusion 48 as a purple neighbor is as follows:
As shown in FIG. 7 and stripe 8, the pulse waveform has approximately the same off time and off time, but as will be explained in connection with the control circuit in FIG. 6, the detection signal of sensor 5o is Since the signal width is only used to determine the operating direction of phase difference correction, the on and off times do not need to be 50 times.

FIG. 4 shows an example of the arrangement of sensors for detecting the arrival of the reference point of each rotating cylinder at the corresponding reference position. In this case, the sensor 52 is placed at a predetermined distance from point a, as shown in FIG. Each reference point P,...Φ returned in the opposite direction to the rotation direction by
They are respectively arranged at outer reference positions corresponding to Px. Specifically, 11- shows the plate cylinder 12 of the first printing unit 14 in FIG.
A drum 56 is fixed coaxially to the rotating shaft 54 of the plate cylinder 120, and an arcuate protrusion 58 having a center angle of 180° and having a reference point P and a full rising edge is integrally formed on the outer periphery of the drum 56. ing. A sensor 52 is disposed and fixed at an outer reference position corresponding to the reference point P of the drum 56 via a bracket 60, and its detection head is entirely connected to the arcuate protrusion 5.
It is placed close to the rotation trajectory of No. 8. Therefore, when the reference point P, the arcuate protrusion 5B serving as the metal rising edge, is detected by the sensor 52 at the reference position, the reference point P coincides with the reference position. The sensor 52 is preferably a proximity switch employing a high frequency oscillation type or other detection principle.

Further, FIG. 5 shows the first side sound of the differential mechanism, which is assumed to be installed with a device #tC to which the control method according to the present invention is applied. This figure 5 is version #1 shown in figure 4.
This figure schematically shows the shaft support on the opposite side of the plate cylinder 12, and the plate cylinder 12 is rotationally driven by the meshing of the driven gear 62 fixed to the rotating shaft 5412 and the drive gear 64. Further, the rotating shaft 54
A differential mechanism (for example, trademark "Harmonic Drive") 66 is attached to the tip of the wave generator shaft 68, and its wave generator shaft 68 is connected to a differential motor 74 via gears 70, 72'. By driving the differential motor 74 forward and backward as appropriate, the plate cylinder 12 rotates independently, thereby making it possible to adjust the phase m.

As shown in FIGS. 6 and 4, sensors 50, 52'
By arranging the cylinders 12 and 12, when the cylinder represented by the plate cylinder 12VC is rotated, signals having the waveforms shown in FIGS. 7 and 8 can be obtained from the respective sensors. Both signals are rectangular waves with substantially equal on-off times; however, since the two signals are normally not synchronized, they appear with a phase difference ψ as shown in FIGS. 7 and 8.

That is, this is the "deviation amount" between the reference point of each cylinder and the reference position where the sensor is located, and therefore, if this phase difference is reduced to zero, the reference points will be synchronized.

Since the operation for bringing the phase difference between the two waveforms close to zero is performed by electrical control of the differential motor 74, one embodiment of the tuning control circuit for this electrical control is described in the sixth embodiment. It is shown in the figure and its circuit operation will be explained.

This tuning control circuit is arranged for each rotary unit, and therefore consists of a number of tuning control units SCU, 5CUx corresponding to the number of synchronizing units.

In this embodiment, it is assumed that the flexo printer slotter is used, but since there is no need to synchronize the creaser unit 22Fi reference point, the spread leg control unit is operated by the SCU, ~
There are 3 units of 8CU5.

In this case, since the operating principle of each unit is exactly the same, only the synchronized control unit (SC) used in the first printing unit 14 will be described. First, the symbols and corresponding names of the circuit elements from the input to the output of the tuning control unit 8CU are as follows.

N8o...Paper feed start origin detection sensor (reference number 50
) NS, ... Plate cylinder reference point detection sensor (reference number 52
)PB...Push button pigeon for synchronized start...Differential motor (reference number 74) A, ~
A8...AND gate 07,0°...OR gate Fl, F2...Noritz flop +P,...Timer AM, ~AM, ,,,amplifier FR, l'L, OK ,,, ri
-L,...Lamp for indicating the completion of synchronization.''
In the flexo printer slotter shown in the figure, the first printing unit) 14' is used for printing plate replacement and other maintenance and inspection work.
ii) After separating from the other second printing unit 1B and completing the required work, both units are combined in 14.18.
At this time, the reference points P and #i of the plate cylinder 12 are deviated from the reference positions by h, so that a series of work steps such as printing and groove cutting cannot be started as is. Therefore, the first step is to determine the main motor illumination which will be the common drive source for each rotating unit.
Turn on the power source and rotate all the rotating cylinders in unison.

Then, taking the first printing unit 14 as an example, as shown in FIGS. 7 and 8, the paper feed start origin detection sensor N5o
(50) and plate cylinder reference point detection sensor N8. (52)
A predetermined rectangular wave is generated with a phase difference ψ.

In this case, FIG. 7 shows a state in which the plate cylinder 12 lags behind the paper feed timing and is out of sync, and FIG. 8 similarly shows a state in which the plate cylinder 12 advances relative to the paper feed timing and is out of sync. . Here, press the synchronization activation pushbutton FB\r to send an on signal to the control circuit SCU shown in Fig. 6.
6. A, and a negative input to the R,8 flip-flop F2. As shown in the circuit example, the signal from the sheet feed origin sensor NSo is input to an AND gate A, and is also negatively input to an AND gate A2, and is also input to a plate cylinder reference point sensor N8. The signals are inverted input to AND gates A1 and A2, respectively. Therefore, when the N8o signal is delayed, the NSo signal is delayed.
When it is Hi), it is NS, and when it is Low (LO), it is NS.

NS ahead of the signal, NS when the signal is ahead.

Assuming that is low (LO) and NS is high (Hi), the R8 flip-flop F has NSo.NS.

is input to S as a set condition, and N8o・NS,
This will be input to H as a key set condition. Therefore, the output of the Noritsubu flop F is a waveform obtained by adding the phase difference ψ to the waveform of NS, as shown in FIG. 7, or a waveform corresponding to the phase difference ψ, as shown in FIG. It appears like this.

In this way, in the output waveform of the 7-lip flop F, the logic (positive/negative or high/low) of the phase difference ψ part differs depending on the direction, so it can be used in the subsequent game).A4. In combination with A5, the direction can be determined, that is, it can be determined whether the delay out-of-tuning shown in FIG. 7 is occurring or the leading out-of-tuning shown in FIG. 8 is occurring. That is, the output of the AND gate A, which is a signal corresponding to the phase difference ψ, and the flip 70 knob I! 1. - and the other AND gate A
, has N,854. AND gate A which takes the signal as an input and inputs the N16 signal as a total negative input.

The output of F and the selection output of flip-flop F are respectively input. Then, when N81 is delayed and out of synchronization, AND gate A4 outputs, and when NS1 is advanced and out of synchronization, AND gate A is output.

outputs. These anime games) A4. The output of A5 is sent to the subsequent AND gate A6. A, respectively. These anime games) A6. As described above, the tuning activation signal of PB is inputted to each of A and A, and the dead band signal t2, which will be described later, is also inputted to each of A and A6. The conditions for each input will be taken at A.

This dead band signal t2 is transmitted to prevent hunting operation and to determine the completion of tuning, and includes the N16 signal and the N8. This is obtained from the configuration of an OR gate O1 which receives the signal as an input, and a timer T which receives the output of the OR gate O4. That is, the NSo signal and N8. As long as the signal is asynchronous, there will be high and low (high φ low), so it is an or game) 0. vr outputs "0" and "1" periodically, and timer T is designed to operate on the edge of the input signal from "0" to "1" and turn off after a short period of time. The pulse waveforms shown in FIGS. 7 and 8 are taken. The width of the minute time after this waveform rises is a dead zone, and since this affects operation accuracy, it is set as small as possible within a range where no hunting operation occurs.

By inputting this dead band signal t in the negative direction to the 6-AND gates A6 and A7, it is possible to prevent a situation in which a signal with a very small width is output to the gate output and a hunting operation occurs when the tuning is completed.

A6. A, the output of γmb AM1. It is amplified by At'v12, operates the relays PR and ii connected to each, rotates the differential motor 74 in the forward or reverse direction, and corrects the phase difference ψ of the rotating cylinders so as to decrease. If we observe this as a whole as the progress of logic in the control circuit,
First, in the case of delay non-tuning shown in FIG. 7, AND gate A,
The output becomes "1" and the knob F1 of the knob 70 is set (at this time, the AND gate A outputs "0" and the AND gate A5 does not operate). flip flop F,
The output "1" of the AND gate A and the output "1" of the AND gate A are input to the AND gate A4, and the output "1" thereof is input to the AND gate A6. Since the FB tuning activation signal "1" is input to this AND gate A6, the output of the AND gate A4 becomes "1", and this output is amplified by an amplifier and operates the relay PR. to rotate the differential motor 74 in the forward direction. As a result, the rotating cylinder is corrected in a direction where the phase difference ψ decreases, that is, closer to the reference point P (see waveform N8).

In addition, in the case of advance non-synchronization shown in FIG.
Activate Ri to reverse the differential motor 20-1 tough 4. As a result, in FIG. 8, N8. As shown in the waveform, the phase difference ψ is corrected in the direction of decreasing.

In this way, the reference points are synchronized in each rotating unit, and in order to determine whether or not this synchronization is completed, an OR gate 02, an AND gate A8, and a knob 70 and a knob F2 are provided. . In other words, ORGATE 02 is an anime game) A4. The outputs of A5 are respectively input, and the output of OR gate 02 is inverted input to AND gate A8. The dead band signal t2 is also input to the AND gate A8, and the 7-rip 70-tube F2 uses the output of the AND gate A8 as a set input, and uses the tuning activation signal of PB as a negative reset input. With this configuration, when the phase difference ψ is larger than the dead band signal t2 width (that is, when tuning is not completed)
Since the input of the dead band signal t8 is included in the negative input of the AND gate A8, no signal is output from the AND gate A8. However, when the phase difference ψ decreases and becomes a "0" signal within the width of the dead band signal t2, the AND condition is satisfied and a pulse signal with the difference width is output, so that the flip-flop F2 is set. The output of this flip-flop F2 is amplified by the amplifier and the relay is OK.
i operation, and as a result, the tuning completion indicator lamp L lights up to indicate the completion of tuning.

As described above, according to the synchronization control method according to the present invention, after arbitrarily and randomly combining each rotation unit, the waveforms obtained by the paper feed start origin detection sensor and the reference point detection sensor of each rotation 7 cylinder are By fully controlling the differential motor so that the phase difference is completely zero, and by aligning all the reference points of each rotating cylinder with the predetermined reference positions.

It is possible to synchronize the reference points easily and with high precision.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a flexographic printer slotter for manufacturing corrugated paperboard sheets as a typical example of a rotary unit composite device, and FIG. 2 is a schematic diagram showing the arrangement of rotating cylinders in the device shown in FIG. Figure 3 is a schematic diagram showing an example of the configuration of a sensor for fully detecting the paper feeding start origin, and Figure 4 is a schematic diagram showing an example of the configuration of a sensor for fully detecting that the reference point of the rotating cylinder has arrived at the corresponding reference position. 5 is a schematic perspective view of an example of the arrangement of a differential mechanism, FIG. 6 is a tuning control circuit diagram as an embodiment of the present invention, and FIGS. 7 and 8 2A and 2B are timing charts respectively when implementing the tuning control method according to the present invention. 10... Paper feeding device 12... Plate cylinder 14...
1st printing unit 16... plate cylinder 1B.
・Second printing unit 20 ・Ruled line head 22 ・・
・Creaser unit 24...Grooving head 26...
・Slotter unit 28... - rule 30・
... Wheel 32 ... Cardboard sheet 34
... Paper feed row 236 ... Rotating disc 68 ... Bi
40...Swinging arm 23- 42...Kitsuka 44...Gear train 46...
Rotating disk 48... Arc-shaped protrusion 50. 52... Sensor 54... Rotating shaft 56... Drum 58.
...Arc-shaped protrusion 60...Bracket 62...Driver gear 64...Drive gear 66...Differential mechanism 68...Wave generator shaft 70.72...Gear 74...For differential Motor special fraud applicant Isowa Iron Works Co., Ltd. 24- JP 58-224589 (11)

Claims (1)

[Claims] Mountain In a rotating unit equipped with a rotating cylinder that processes a workpiece, and a differential mechanism that performs the phase of the rotating cylinder, the starting point of supply of the workpiece is determined by a sensor. The reference point of the rotating cylinder is detected by a sensor installed at a predetermined reference position to obtain a pulse signal, the direction of the phase difference of these pulse signals is determined, and the direction is determined according to the direction. A synchronization control method for a rotating unit, characterized in that the differential mechanism is controlled to fully rotate in the normal direction or in the reverse direction to bring the phase difference close to zero. 0) The reference point of the rotating cylinder is found at a position that is returned in the opposite direction of rotation on the circumference of the rotating cylinder by the distance from the feed start origin of the workpiece to the bottom dead center of the rotating cylinder, and 2. The synchronization control method for a rotating unit according to claim 1, wherein the reference position for arranging the sensor is determined at a position outside the rotating cylinder corresponding to the reference point.