JPS5914007A - Method for tuning numerical control of rotary unit - Google Patents

Abstract

PURPOSE:To tune numerical control accurately for a short time by setting up an aperiodic state as an absolute position value on the circumference of a cylinder through a command. CONSTITUTION:A preset up/down counter PRC in a control unit SCU1 sets up the contents of data bus (gdb) at the front edge of a signal ns1 from a sensor NS1 and adds/subtracts the contents by a pulse signal pg1. The data bus (pdb) of the counter PRC is inputted to the succeeding binary data adder ADD2, and an output data bus (ddb) from a numeral setting switch PSW for the movement of a reference point is converted through a data code converter DBC and connected to the other input of the adder DD2 as an output data bus (sdb). The switch PSW sets up a reference point corresponding to a production sheet as an absolute value from a mechanical reference point of a rotary cylinder, and when the value is a positive value, the reference point is delayed from the mechanical reference point by the value. When the value is a negative value, the reference point is advanced from the mechanical reference point by the value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for numerically controlling a rotary unit, and more particularly, to a rotary printing unit installed in a corrugated sheet production line, for example. In a rotating unit equipped with a series of multiple rotating cylinders such as a machine, even if the reference point of the rotating cylinders is different for each production sheet or production machine unit, the out-of-sync state can be determined by the absolute position on the cylinder circumference. (Absolute IJ, -T system) This relates to a control method for achieving accurate synchronization in a short time by setting commands as numerical values.

Multicolor rotary printing presses, so-called printer slotters (combined multicolor rotary printing presses and groove cutting machines) used in corrugated sheet production lines, and other printer die cutters (combined multicolor rotary printing presses and punching machines) In a rotating unit equipped with a plurality of rotary cylinders of equal diameter in series, such as a machine), each rotary cylinder has its machining contact point (bottom dead center or top dead center)
Each reference point has its own mechanical reference point, and each reference point is precisely synchronized, i.e., so that each reference point sequentially arrives at the corresponding machining contact point in a timely manner as the machining process progresses over time. Returning to the origin is an extremely important factor.

2- However, the units constituting each component of the composite device are configured to be able to be separated from each other for work preparation and inspection, and each cylinder is used for mounting printing plates and die boards, adjusting the position of the grooving blade, etc. Because it can be rotated freely independently,
When the above-mentioned setting operations are completed and the units are reconnected, the relative positions of the reference points of the rotating cylinders are random. Therefore, the device cannot be operated in this state, and it is necessary to synchronize the series of reference points before operation.

This relationship will be explained with reference to FIG. In Figure 1,
A printer slotter suitably used in a corrugated sheet manufacturing line is shown as a typical example of the above-mentioned multifunction device.

This includes a first printing unit 14 equipped with a paper feeder 10 and rotatably disposed a plate cylinder 12, a second printing unit 18 disposed with a plate cylinder 16, and a creaser unit disposed with a ruled line head 20. 22 and a slotter unit 26 on which a grooving head 24 is disposed, and each unit is connected to a common rail 2 so that they can be connected and separated from each other.
8 via wheels 30. The plate cylinders 12 and 16, the ruling head 20, and the grooving head 24 (some of these cannot be strictly called cylinders, but for convenience, they will also be referred to as rotary cylinders hereinafter) are bl, b2+b3, respectively. Each processing contact point (in this embodiment, the bottom dead center) indicated by b4 performs the functions of printing, lining, and grooving. Therefore, when the cardboard sheet 32 on the paper feeder 10 is fed, when the leading edge of the sheet 32 reaches the bottom dead center of each rotating cylinder, the unique reference point of the cylinder also comes to the bottom dead center. In this specification, it is referred to as "synchronizing the reference points" that the reference points of the plurality of rotating cylinders are operated in sequence so that the reference points of the cylinders reach the corresponding bottom dead centers in a timely manner. ]. In addition, here 1
As will be explained in connection with FIG.
The position on the outer periphery of the cylinder that has returned in the opposite direction of rotation by the straight line distance up to the point P is indicated by the symbol P.

Then, as mentioned earlier, each unit is separated from each other for work preparation and inspection, and the descendant units are recombined after each rotary cylinder is rotated freely independently, so the reference point P of each rotary cylinder corresponds to that of the descendant unit. Because of this, the processed contact point deviates from the zero point 2, which is located at a fixed position spaced apart in the circumferential direction by a predetermined center angle, and so-called synchronization cannot be achieved.

In order to correct such a deviation of the cylinder reference point P from the zero point Z, various means have been conventionally employed to return the reference point to a predetermined zero point by rotating the cylinder manually or electrically. Regardless of which method is used, the operator must align the reference line such as an arrow with the scale, and it is difficult to avoid foreign error factors such as visual errors or unfamiliarity on the part of the operator. there were. Furthermore, even if the reference point of each unit's rotating cylinder can be returned to zero accurately, when the units are recombined, meshing errors will occur in the series of gear trains, resulting in complete synchronization of the rotating unit as a whole. may not be achieved. Therefore, before operating the apparatus, it is necessary to test feed a workpiece, such as a corrugated cardboard sheet, and check the processing state, which requires complicated operations and a lot of adjustment time.

In order to solve the above-mentioned drawbacks inherent in the conventional technology, the inventor has made extensive research and has developed a pulse signal for detecting the start of supply of the workpiece and a pulse signal for detecting the position of the reference point of the rotating cylinder. We have devised a control method in which the direction of the phase difference is determined by comparing the two directions, and the rotary cylinder is controlled to rotate forward or reverse depending on the direction, thereby bringing the phase difference closer to zero. The control method according to this patent application is highly evaluated in that it is possible to easily return the reference point specific to each rotary cylinder to the corresponding zero point with a simple configuration. However, in the above control method, the reference point of each rotating cylinder is fixed mechanically and fixedly.
Therefore, there is a drawback that a rotating unit having a configuration in which the reference point of each rotating cylinder is not fixedly determined and changes depending on the dimensions of the workpiece, etc. cannot be put to practical use as is. In other words, since the printing plates, punching plates (die boards), etc. that are wrapped and attached to each rotating cylinder are manufactured according to the specifications of conventional manual attachment machines, the reference point is Each seat or production machine has a different design. Therefore, when introducing the control method to this type of mechanical device for use, it is necessary to redesign and remanufacture these jigs, which imposes a large burden on the user. It means that.

Therefore, the inventor of the present application did not need to redesign the jig, etc.
As a result of further studies in order to obtain a synchronized control method with excellent versatility that can be used as is in the existing state, we found that the rotating cylinder is If the absolute position is digitized as the circumference length, the out-of-synchronization state is recognized numerically from the reference point of each rotating cylinder and the absolute position value, and the control is performed so that this value matches the command value, the desired result can be achieved. It was found that the system could fully meet the requirements of

Therefore, in the rotary unit synchronization control method according to the present invention, in a rotary unit equipped with a rotary cylinder that processes a workpiece and a differential mechanism that adjusts the phase of the rotary cylinder, the fluctuation reference point of the rotary cylinder is adjusted to A command is set as an absolute position value from a mechanical reference point specific to the rotating cylinder, one rotation of the rotating cylinder is quantized, the rotational state is detected as a numerical value by an appropriate detection means, and the positive or negative of the difference value is determined by comparing the numerical values. The present invention is characterized in that the differential mechanism is selectively rotated in forward and reverse directions by determining the difference value, and the rotation of the differential mechanism is instantaneously stopped when the difference value becomes zero.

Next, the absolute numerical control tuning method for a rotating unit according to the present invention will be described in detail below with reference to the accompanying drawings, citing preferred embodiments. The printer slotter shown in FIG. 1 will be described as a specific example of a rotary unit in which the numerical control tuning method according to the present invention is implemented, but other printers that are a combined device of a rotary printing press and a punching machine may also be used. It goes without saying that the present invention can be suitably applied to a die cutter or a so-called printer die cutter slotter that can selectively perform printing groove cutting or printing punching by combining a groove cutting machine and a punching machine with a rotary printing press. Further, the control method of the present invention is applied only to devices that are equipped with a differential mechanism for adjusting the phase of a rotary cylinder (for example, a differential mechanism trademarked as "Harmonic Drive") as existing equipment. Since most of the rotation units of current multicolor rotary printing presses and multifunction devices such as printer slotters are equipped with the above-mentioned differential mechanism for phase adjustment, there is no concern that the application of the present invention will be limited. .

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

FIG. 2 is a schematic diagram showing the arrangement of the rotating cylinders of the device shown in FIG. 1, and the circumferential length of each cylinder is 1400 m.
, the distance from the gripping point a of the sheet 32 by the paper feed roller 34 to the plate cylinder bottom dead center b1 of the first printing unit 14 is 827 m, the distance to the plate cylinder bottom dead center b2 of the second printing unit 18 is 1387 m, Furthermore, it is assumed that the distance to the cylinder bottom dead center bx of any rotary unit in the front direction in the sheet feeding direction is xm. In this case, the leading edge of the cardboard sheet 32 in the paper feeding device 10 is 82 degrees from point a of the paper feeding roller 34.
When the plate cylinder 12 moves forward by 7 strokes, the printing reference point P+ of the plate cylinder 12 reaches the bottom dead center bl, and when it moves 1387 sm forward from the point a, the printing reference point P2 of the plate cylinder 16 reaches the bottom dead center b2, and similarly If the operating reference point Pg of the rotary cylinder reaches the bottom dead center bχ when moving xtm forward from point a, each reference point Pl...Pz will correspond to the corresponding bottom dead center bt...b
This means that the synchronization with z is achieved. Therefore, on the circumference of each cylinder, the positions PI, P2 . ...Pz may be used as a reference point for each cylinder.

So, this P! ...When the reference point of Pz is converted into the rotational phase angle θ of each cylinder, the circumferential length of each cylinder is 1400so* as described above, so it is calculated as 1400 1400 400.

Therefore, when the leading edge of the corrugated paperboard sheet 32 reaches the paper feed start origin a on the paper feed roller 34, the operation reference point P+...Pχ of each cylinder reaches the corresponding reference position (zero point).
The differential mechanism of each cylinder may be controlled so that the That is, at this time, a zero point is found at a fixed position outside the cylinder corresponding to the reference point P of each rotating cylinder, and the absolute position value of the cylinder rotation is detected at the zero point Z corresponding to the reference point P unique to each cylinder. It turns out.

By the way, the reference point of this rotating cylinder should originally be determined mechanically as one point on the circumference of the cylinder as described above, but as mentioned earlier, the reference point of the rotating cylinder should be mechanically determined as one point on the circumference of the cylinder, but as mentioned earlier, the reference point of the rotating cylinder is The reference point may vary depending on the production machine and production machine. Therefore, in the control method according to the present invention, a reference point determined according to a production sheet, etc. is commanded as an absolute position value from the mechanical reference point of the rotary cylinder, and compared with the detected absolute position, and the difference value becomes zero. This will control the forward and reverse rotation of the differential motor.

Therefore, in order to perform the synchronization control according to the present invention, as shown in the control circuit example shown in FIG.
Paper feed unit rotation pulse generator PG.

Since this is required as a minimum means for collecting external information, its mechanical configuration will be explained first. FIG. 3 shows an example of the arrangement of a sensor that detects when the leading end of the corrugated paperboard sheet 32 reaches the paper feed start origin a on the paper feed roller 34. That is, the corrugated cardboard sheets 32 stacked on the paper feeding table of the paper feeding device 10 are cranked by a pin 38 eccentrically protruding from a rotating disk 36 and a swinging arm 40 that engages with the bin 38. The sheets 32 are caught 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 starting from the lowest sheet 32. A pair of upper and lower paper feed rollers 34 are disposed at the front in the sheet feeding direction, and the position where the leading edge of the sheet 32 is gripped by these rollers 34 and 34 is defined as the paper feed start origin a. The origin does not necessarily have to be at this position, and may be at point a', which is a distance α ahead of point a, as shown in FIG. A rotary disk 46 is attached to any of the gear train 44 that drives the paper feed roller 34.
are coaxially fixed, and a central angle of 180 is fixed to this rotating disk 46.
An arcuate protrusion 48 having an angle of 40° is arranged and fixed. A sensor 50 (sixth
In the figure, a sheet feeding start origin detection sensor NSo) is provided. In this case, if the tip of the arcuate protrusion 48 is set to pass in front of the detection head of the sensor 50 when the tip of the sheet 32 reaches point a, the tip of the arcuate projection 48 can be set to pass in front of the detection head of the sensor 50. Arrival at the point can be detected by the sensor 50. In addition, as the sensor 50,
Although a high-frequency oscillation type proximity switch is preferably used, a magnetic proximity switch (in this case, the arcuate protrusion 48 is made of a magnetic material) or a photoelectric switch may be used as appropriate. In this way, the signal waveform from the sensor 50 having the arcuate protrusion 4B as a proximate object becomes a pulse waveform with approximately equal on time and off time as shown in FIG. 8, but in relation to the control circuit shown in FIG. As explained, the detection signal of the sensor 50 is used with its front edge as a reference, and the signal width is only used to determine the operating direction of phase difference correction, so each of the on and off times is 50%. It doesn't have to be.

Further, a rotation pulse generator 51 (indicated by the symbol PGo in FIG. 6), which quantizes the amount of transport of one corrugated sheet 32 being fed and grasps it as a position value, controls the feed roller 32.
It is coaxially connected to any of the gear trains 44 that drive 4. This rotary pulse generator 51 has a power of 1.05gg+/
A device having an accuracy of a pulse detection unit is used, and the mounting position is not limited as long as the rotation of the paper feed roller 34 can be detected. The pulse generator 51 (P
1 in the output waveform of Go), sheet 3 as shown in Figure 8.
2 is 1. This is a single pulse train in which one pulse is generated each time OM advances.

Next, FIG. 4 shows an example of the arrangement of sensors for detecting that the reference point P of each rotating cylinder has reached the corresponding zero point position.

In this case, the zero point Z is from the paper feeding start origin a to the bottom dead center b1...bχ'' for each rotating cylinder, as shown in FIG.
! , the corresponding bottom dead center b1...
It is determined at a fixed position outside the cylinder, which is returned by a predetermined rotation angle in the opposite direction to the rotation direction with bχ as a reference. The sensor 52 (indicated by the symbol NS+ in the control circuit example of FIG. 6) is disposed at an external fixed position of the proximal body coaxially disposed with the rotary cylinder 12, as shown in FIG. That is, the rotation axis 5 of the plate cylinder 12 in the first printing unit 14
4, a drum 56 as a proximal body is coaxially fixed,
An arcuate protrusion 58 having a center angle of 180° is integrally formed on the outer periphery of the drum 56 as the entire starting point of the rising edge E.

Then, at a point in time when the reference point P1 of the cylinder (plate cylinder) 12 coincides with the zero point Z1, the rising edge E of the drum 56 is fixed to the bracket 60 at a fixed position outside the drum.
The sensor 52 is positioned so as to be in close proximity to the sensor 52 disposed therebetween. Therefore, when the rising edge E of the arcuate projection 58 is detected by the sensor 52, the reference point R of the cylinder 120 has returned to the zero point Z1. Note that the sensor 52 used here is preferably a sensor employing various detection principles such as a high frequency oscillation type or a magnetic detection type.

FIG. 5 shows an example of a differential mechanism that is assumed to be installed in a rotating unit in which the control method according to the present invention is implemented. This FIG. 5 schematically shows the shaft support on the opposite side of the plate cylinder 12 shown in FIG.
The plate cylinder 12 is rotationally driven by the engagement between a driven gear 62 fixed to the drive gear 64 and a driven gear 64 fixed thereto. At the tip of the rotating shaft 54 is a differential mechanism 66 (for example, the trademark "
A wave generator shaft 68 is connected to a differential motor 74 via gears 70, 72. By driving the differential motor 74 in forward and reverse rotation as appropriate, the plate cylinder 12 rotates independently, thereby performing phase adjustment. Also,
The wave generator shaft 68 has a detection unit of 1.0 m.
A rotary pulse generator 75 (indicated by PCI in the example of the control circuit in FIG. 6) having an accuracy of /pulse is connected, and the position difference of the reference point of the plate cylinder 12 in the unsynchronized state is determined by the rotary pulse generator 75, it is detected as a pulse. Note that this rotational pulse generator 75 has PG+ for each unit.
...Arranged as PGx.

Next, FIG. 6 shows a control circuit as a preferred embodiment for smoothly achieving the rotary unit synchronization control method according to the present invention, and the operation of the circuit will be explained. In FIG. 6, a synchronization control unit SCU is provided for each rotating unit, and includes a binary down counter CNT for indicating the seat position, a binary data adder ADD1, and a binary data adder ADD1 as circuit elements common to each rotating unit. A switching (Goo) DG is provided. The symbols and corresponding names of the circuit elements from the input to the output in the tuning control unit 5CUl are summarized as follows.

PRC・・・Presetup down counter AD
D2...Binary data adder OCG...Output control gate ZDC...Zero value decoder A1-A3...And gate ~AMa...Amplifier FR, RR, OK...・Relay PB... Tuning start activation switch DEC... Data code converter (decimal → 2
APD...Paper feed position display PDP...Rotation unit position display FDP...
Tuning deviation indicator M...Differential motor (symbol 74) L...Lamp for indicating the completion of tuning PSW...Numeric value setting switch for reference point shift In the printer slotter shown in Fig. 1, the printing plate The first printing unit 14 is separated from the second printing unit 18 for replacement and other maintenance work, and after the necessary work is completed, the two units 14 and 18 are connected. At this time, since the plate cylinder 12 has already been arbitrarily rotated, its reference point PI is shifted from the zero point Z+, so a series of printing, grooving, etc. operations are started for the entire rotating unit as a composite device. I can't. Therefore, first, the main motor, which serves as a common drive source for each rotating unit, is powered on to rotate the rotating cylinders all at once. As a result, if the first printing unit 14 is taken as an example, the paper feed start origin detection sensor NSo shown in FIG. 6, the reference point detection sensor NS1 and the rotation pulse generator PGo of the paper feed unit, A waveform signal is output.

In addition, in each synchronization control unit, if the reference point of the rotating cylinder is designed differently for each production sheet as described above, use the numerical setting switch PSW for shifting the reference point.
Operate the operator to set in advance the absolute position value from the reference point corresponding to the production sheet and the original reference point unique to the rotating cylinder (if the reference point is not designed to differ depending on the production sheet) (set value of this switch PSW is set to zero (0)).

A binary down counter CNT, which is a circuit element common to each rotation unit, includes a paper feed unit rotation pulse generator PGo.
The output pulse of is inputted as a down count, and the signal of the sensor NSo for detecting the paper feed start origin is inputted as a reset input. Therefore, the data bus c of the binary down counter CNT
As shown in FIG. 7 (1), after being reset to zero at the front edge of the sensor NSo signal, db changes from -1 → -2 → -3 every time the output pulse of the pulse generator PGo is input.
The content changes as ...-n. The pulse generator PGo has a detection unit of 1. As mentioned above, it has an accuracy of 1/pulse.
The pulse represents a progression of 1.0 mg. Therefore, the limit of down-counting due to cumulative pulses is determined by the circumference of the rotating cylinder to which the pulse generator PGo is attached, and in this example, the cylinder circumference is 1400 m, so the maximum is -1399. The pattern is to return to zero.

Therefore, the data bus cdb, which is the output of the binary down counter CNT, becomes 12 signal lines when expressed in binary code (in Figure 7 (1), the digits are "0 to 11"). ), this data node cdb is 2
decimal data adder ADD 1 and data switching game) DG
has been entered. In addition, a binary data adder ADD 1
The other input is the data with a fixed value of 1400 (in binary value, MS B 010101111000LSB, where MSB represents the highest digit and LSB represents the lowest digit).
is connected. Note that the fixed data value in this case is made to match the circumferential length of the rotating cylinder. In this way, 2
One input of the decimal data adder ADD 1 is the output data bus cdb of the binary data counter J,
Since this is a changing value of 1399 and the other input is a fixed value of 1400, when binary data is added in the adder ADD I, the output changes as 1400...3 → 2 → 1. becomes. This output data bus adb is shown in FIG. 7(2).

Output data bus ad of the binary data adder ADD 1
b and the output data bus cdb of the previous binary down counter CNT are both input to the binary data switching gate DG. Further, a signal from a paper feed start origin detection sensor NSO is also input to this game (DG) separately, and the data buses adb and cdb are switched according to the logic of this signal. That is, as shown by the arrow in FIG. 7, while the NSo signal is on in the rotation interval of approximately 18σ from the reference point of the rotating cylinder, the data bus cdb is selected and output, and the NSo signal is off. , the data bus adb is selected and output. Therefore, the output data bus gdb of the data switching game) DG is omitted.
The contents of 0 are as shown in Fig. 7 (3). This means that the reference point P of the rotating cylinder is set to zero, and 0 →
700. It means a change from -699 to 0, and indicates the absolute value from the reference point position.Therefore, as explained below, the reference point signal NS l=
At the operating edge of NSχ, the output data bus gd
By latching the contents of b, it is possible to determine the direction and amount of deviation in the out-of-synchronization state.

The synchronization control units 5CU1 to SCUn to which the output data bus gdb is input are provided corresponding to each rotation unit, and all have the same circuit configuration, so that they are used in the first printing unit 14. Only the tuning control unit SCU+ will be explained.

As mentioned above, the tuning control unit 5CUI includes the data bus gdb indicating the absolute position of the reference point, the start signal pb of the start switch PB for starting tuning, the signal nB1 of the reference point detection sensor NS1, and the signal nB1 in the differential mechanism. A signal Pgl from a differential rotation pulse generator PGl connected to the wave generator shaft 68 and generating one pulse for one fin in terms of displacement on the cylinder circumference is inputted.

First, the preset up/down counter PRC in the control unit 5CUt sets the contents of the data bus gdb at the front edge of the signal nBr of the sensor NSI, and performs addition/subtraction counting using the pulse signal pgt.

Note that this pulse signal pgl is A, although not shown.

There is a signal output called phase B with a 90° phase difference, and the 90° phase difference switches alternately depending on the rotation direction of the differential motor M. The input is switched to the down input, or to the up input if the rotation is normal, and in either case the input is made to approach the zero value, as shown in FIG.

The output data bus pdb of this pre-setup down counter PRC is input to the next binary data adder ADD 2, and the output data bus ddb from the reference point transition numerical value setting switch PSW is input to the other input to the data code converter DBC. After the decimal value is converted into a binary value, it is connected as an output data bus sdb.

As mentioned earlier, this switch PSW is set by the operator as a reference point according to the production sheet as an absolute value from the machine reference point of the rotary cylinder. ■ If the value is negative, the content is to advance the machine reference point by that value. Therefore, binary data according to the settings appears on this output data bus sdb.

The binary data adder ADD 2 has no effect when the data bus sdb input thereto has a zero value, but when the data bus sdb has a numerical value, it performs the following operation. For example, if the data bus sdb has an N8 value, it will not be added to the Np value indicated by the other data bus pdb.
The out-of-tuning difference from the reference point, which is the output of the hexadecimal data adder ADD 2, is (Np + Ns). And as mentioned later,
Since this value is controlled to be zero, Np + N8 = 0, ', N8 = -Np In other words, for the reference point shift value N8, the same value Np with different polarity is used as data. Tuning is completed when the bus pdb becomes as indicated.

Output data bus ed of the binary data adder ADD 2
b and tuning activation signal pb are output control gate OCG, respectively.
is input. This output control gate OCG is a zero value decoder ZD that determines the zero value of the content indicated by the data bus edb.
C and an AND gate At-A3. Note that the logic of the output data bus edb of the binary data adder is negative when it is "1" in the logic of the highest digit MSB, and "0".
” is true.

The MSB signal of the data bus edb is input to an AND gate A2 for forward rotation of the differential motor, and is negatively input to an AND gate A3 for reverse rotation of the differential motor. Further, the zero-value decode signal of the zero-value decoder ZDC is also input negative to the AND gates A2 and A3, respectively, and is input positive to the AND gate Al for indicating completion of tuning. Further, the tuning activation signal pb is input to each AND gate At-As.

Therefore, the output data bus e of the binary data adder ADD2
If db is a negative value, the MSB signal is "1" as described above.
Therefore, the pb multiplied signal is "1". Since the output of the zero value decoder ZDC is "0" and is inverted input to the AND gate A2, the input condition of the AND gate A2 is satisfied and a differential motor normal rotation signal is output. This signal is amplifier A
It is amplified by M+ and drives relay FR, thereby causing differential motor M+ (74) to rotate normally. At this time, the other anime game F AI + A3 does not operate because the input condition is not satisfied.

If the data bus edb is a positive value, the MSB signal is
Since the output "0" of the zero value decoder ZDC is also negatively input to the AND gate A3, the input condition is satisfied, and a differential motor reverse rotation signal is output. This signal is amplified by amplifier AM2 to drive relay RR, and differential motor M1 (74) rotates in reverse.

At this time, the pulse signal 1) gl from the pulse generator PG+
is output, it is determined whether the phase direction of the two-phase signal is normal or reverse, and if it is reversed, it is counted by subtraction, and if it is still in the normal direction, it is counted by addition, and as a result, the data bus ddbO value approaches the zero value.

When the data bus ddb becomes a zero value in this way, the output signal of the zero value decoder ZDC becomes "1", so the input conditions of the controller A2 and A3 no longer hold, and the input conditions for the differential motor Mi Forward/reverse rotation signals will no longer be output. In that period 9, the input conditions for Antogame) AI are met,
A tuning completion signal is output, amplified by amplifier AMa, and relay O
K is activated, and the tuning completion display lamp Ll lights up to indicate the completion of tuning.

That is, according to the control method according to the present invention, a reference point corresponding to a production sheet of a rotary cylinder is set in advance as an absolute value from a mechanical reference point specific to the rotary cylinder,
Quantizing the circumference of the rotating cylinder, numerically detecting the rotational state, numerically recognizing the out-of-synchronization state by this and detecting the reference point of each rotating cylinder, and comparing it with the set numerical value, If this difference value is a positive value, the differential motor is driven so that it rotates in the forward direction, and if it is a negative value, it is driven in the reverse direction.The differential motor is controlled in forward and reverse directions until the difference value becomes zero, and then The purpose is to stop the motor when the value is reached and complete the tuning.

Note that the display APD indicates the absolute position of the paper feeding state.

An indicator FDP% indicating the rotational position of each rotating cylinder and an indicator EDP indicating the deviation value of non-synchronization are provided to improve operability and maintenance.

Therefore, according to the present invention, even in a mechanical device in which the reference point of the rotating cylinder in each rotating unit is designed differently depending on the size of the workpiece, the reference point can be set to a mechanical point unique to the rotating cylinder. Just by setting it as an absolute value from the reference point, the reference point will be automatically synchronized. For corrugated board manufacturing equipment, this means that it can flexibly respond to changes in the reference point due to changes in orders for corrugated sheets to be produced, making it highly versatile and capable of handling printing plates, die boards, etc. This eliminates the need to redesign jigs such as the above, and can significantly reduce the burden on the user. Further, in a rotary slotting machine such as a slotter device, the flap dimension to be slotted is a transition value of the reference point described herein.

For this reason, in the conventional slotter device, a separate step was required to move the flap by the dimensional value of the grooving length after the synchronization was completed, but according to the control method according to the present invention, this dimensional value is moved to the reference point. By setting the shift amount in the numerical value setter PSW, a shift corresponding to the dimension value of the flap grooving length can be achieved simultaneously with the synchronization, so that time can be shortened.

Note that the configuration and circuit of the tuning control according to the present invention are only one example, and the same effect can be obtained even with a configuration modified as described below.

■ The part within the dashed-dotted line shown in Figure 6 is connected to the paper feed mechanism and outputs the data bus gdb as the absolute position value of the paper feed state.Therefore, the entire configuration is replaced with an absolute rotation detector. You can also do that. In addition, data bus g
The absolute position value indicated by db is ±700, but it is 0 to 1400.
However, in this case, the adder ADD and the data switching game 1-DG inside the one-dot chain line become unnecessary, the down counter CNT is changed to an up counter, and this output is connected to the data bus gdb. Just do it.

(2) Numerical recognition of the out-of-synchronization state of each rotating cylinder is performed by sensors N5l-NSχ for each rotation of each rotating cylinder, and the differential motor is operated in forward/reverse direction or stopped in accordance with the deviation. Therefore, the rotational pulse generator PGl for detecting the amount of phase correction is linked to the differential motor shaft of each rotating cylinder.
~X is basically not necessary and is provided to expand the dynamic characteristics and conditions of tuning control.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a printer slotter for manufacturing corrugated paperboard sheets as a typical example of a rotary unit composite device, Fig. 2 is a schematic diagram showing the arrangement relationship of the rotating cylinders of the device shown in Fig. 1, and Fig. 3 4 is a schematic diagram showing an example of the arrangement of a sensor for detecting the starting point of paper feeding and a rotating pulse generator of the paper feeding unit, and Fig. 4 detects when the mechanical reference point specific to the rotating cylinder has reached the corresponding zero point position Fig. 5 is a schematic perspective view showing an example of sensor arrangement, Fig. 7 shows a differential mechanism and a rotary pulse generator arranged on its wave generator shaft, Fig. 7 is a list showing the contents of each output data bus, and Fig. 8 shows a schematic perspective view showing an example of sensor arrangement. FIG. 3 is a timing chart diagram when implementing the tuning control method according to the present invention. 31-10... Paper feeding device 12... Plate cylinder 14...
First printing unit 16...plate cylinder 18...second printing unit 20...rule head 22...creaser unit 24
...Grooving head 26...Suronotaunino) 28...
・Rail 30...Wheel 32...Cardboard sheet 34
... Paper feed row 2 36 ... Rotating disk 38 ... Pin 40 ... Swinging arm 42 ... Kicker 44 ... Gear train 46 ... Rotating disk
48... arcuate protrusion 50, 52... sensor
51... Rotating pulse generator 54... Rotating axis
56... Drum 58... Arc-shaped protrusion 60... Bracket 62... Driven gear 64... Drive gear 6
6... Differential mechanism 68... Wave generator shaft 70. 72... Gear 74... Differential motor 75... Rotating pulse generator patent applicant Isowa Iron Works Co., Ltd.

Claims (1)

[Claims] In a rotary unit equipped with a rotary cylinder that processes a workpiece and a differential mechanism that adjusts the phase of the rotary cylinder, the fluctuation reference point of the rotary cylinder is determined from the absolute position from a mechanical reference point specific to the rotary cylinder. The command is set as a value, one rotation of the rotating cylinder is quantized, the rotational state is detected as a numerical value by an appropriate detection means, and the positive or negative of the difference value is determined by comparing the numerical values, and the differential mechanism is selectively operated in the positive or reverse direction. Numerical control tuning method for a rotating unit 0, characterized in that the differential mechanism is rotated and the rotation of the differential mechanism is instantaneously stopped when the difference value becomes zero.