JPS6225582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When a temporary change in processing speed occurs between a front process and a post process in a sheet processing apparatus, the present invention absorbs this speed difference and improves the speed of the sheet process. This invention relates to a sheet-like material speed difference matching device that enables stable running and maintenance of constant tension.

Accumulators have been widely used as this type of sheet-like material speed difference matching device for a long time. The sheets sent from the process are stored, and after the rewinding is completed, the winding speed is faster than the previous process, so that the stored sheets are emptied and prepared for the next rewinding. The means used are conventional methods.

By the way, a conventional accumulator has a group of guide rollers that move up and down and a group of fixed guide rollers installed above the guide rollers, and the sheet is stretched back and forth in a hairpin shape between them. The structure is such that the sheet is kept on standby at a predetermined position and lowered when necessary to accumulate the sheet.In this case, as a means for raising and lowering, a counterweight is attached to the group of lifting rollers, and a counterweight is attached to the group of lifting rollers, and a force is applied between the sheet and the tension. It was a so-called driven system that caused the balance to be achieved.

Such a structure has problems such as a large tension being applied to the sheet and large fluctuations in tension due to inertia. Therefore, by using power to actively move the elevating guide roller group up and down, excessive tension can be avoided. The present applicant previously proposed a new device that does not cause tension fluctuations in Japanese Patent Laid-Open No. 56-43150, and in this case, the lifting speed (V) of the lifting side guide roller group is expressed as V= V _l -V' _l /2n...(A) However, it is clear from the above publication that V _l ...Pre-process speed V' _l ...Post-process speed n...The number of lifting guide rollers should be controlled. It is.

However, it is difficult to maintain the relationship expressed by equation (A) above accurately even during transient operation, and conventionally there have been problems in which the seat temporarily loosens or excessive tension is applied. , improvement in this point has been strongly desired.

In view of such problems, the present invention eliminates the conventional defects and performs not only the normal case where the speed difference between the front and rear processes is constant, but also the transition period where the speed difference moves, such as starting and stopping, in the later process. This was done with the aim of ensuring stable running and constant tension by ensuring that the above relationship is maintained correctly at all times, especially for sheet-like materials (hereinafter referred to as sheets). From the total value of the sheet running speed in the previous process and the speed correction sheet obtained by combining the dancer roller that imparts a Rotation control of a motor that raises and lowers the moving guide roller group in order to raise and lower the moving guide roller group at a speed obtained by subtracting the sheet running speed in the subsequent process divided by twice the number of rollers in the moving guide roller group. A control circuit is provided to perform this, and this control circuit is used to control the moving side guide roller group to descend during the period after the subsequent process decelerates from speed synchronized operation including stopping, increases speed, and reaches speed synchronized operation. The movable guide roller group is operated so as to rise until the movable guide roller group returns to the predetermined position, after the speed is increased from the speed synchronized operation, and until the speed synchronized operation is reached.

However, with the above-described configuration of the present invention, when the subsequent process decelerates, the moving roller group is lowered to gradually increase the amount of stored sheets, and even during speed increase, the low speed is maintained until it synchronizes with the previous process. In the same way, the storage amount is gradually increased, and the moving roller group is raised until the storage amount is decreased and the moving roller group is returned to the predetermined position. It is possible to match the speed difference during the period and maintain a constant tension, and thus the intended purpose has been achieved.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a nip roller provided at the unwinding end of the front step I, which is equipped with a pair of rollers 1a and 1b that are forcibly rotated under pressure.
Reference numeral 2 denotes a winding shaft of a winding device in the downstream process, such as a surface winding machine.

3 is a constant tension applying device consisting of a dancer roller 3a and guide rollers R, R.
is provided so as to be movable up and down and rotatable below the guide rollers R and R, guided by a guide mechanism (not shown), and to move up and down while applying a constant tension due to the load to the stretched sheet S. ing.

A correction detector 7 is provided which detects the amount of displacement of the dancer roller 3a and converts it into a proportional electrical quantity as a positive value in the case of an upward movement and a negative value in the case of a downward movement.

4 is an accumulator with 4 guide rollers R ₁
A fixed side guide roller group 4a consisting of ~R ₄ and 3
A movable guide roller group 4b consisting of book guide rollers _R5 to _R7 and a pair of upper and lower chain sprockets 5 and 6 are endlessly engaged and connected to the support frame of the movable guide roller group 4a. chain 8
and a motor 9 connected to the chain sprocket 6 for actively moving the movable guide roller group 4a up and down.

The dancer roller 3a and the accumulator 4 are disposed between the front stage A and the rear stage B, with the former on the upstream side and the latter on the downstream side.

In addition, 10 in FIG. 1 is a drive motor for the front process, and 1
Reference numeral 1 denotes a drive motor for the rear process (winding machine), 12 a running speed detector for the front process A, 13 a rising/lowering speed detector for the roller 9, and 14 a running speed detector for the rear process B. .

In the sheet processing apparatus having the above structure,
To explain how the accumulator 4 is driven up and down, the accumulator 4 generally absorbs the belt-like material that is pulled in when the rear process RO stops or decelerates, and when restarting, the speed of the rear process RO is changed to the speed of the front process I. It is used for so-called chasing operation to drive faster, and in Fig. 2, the horizontal axis shows time and the vertical axis shows speed, and the upper line shows the speed of the downstream process, and the lower line shows the speed of the downstream process. As shown in the graph of , the accumulator 4 is operated at the same speed as the previous step A, that is, V' _l-0 = V _l , and receives a stop signal at the t ₀ point. , comes to a complete stop at point t ₁ , that is, V′ _l-1 = 0, creating a speed difference V _l with the previous process I, then restarts at point t ₂ and accelerates, and at point t ₃ the previous process I reaches the speed V _l of , and the speed difference with the previous process i becomes 0.

Thereafter, the speed is further increased and when V'l _-2 is reached at point _t4 , the sheet S stored during the stop period is sent out from the accumulator 4 to the subsequent process RO in a chasing operation.
That is, V′ _l-2 =V _l +α, and α corresponds to the chasing portion.

Considering the lifting and lowering of the accumulator corresponding to this, for example, if the descending direction is the storage direction, it starts descending at point _t0 , increases the descending speed, and then descends at a constant speed from point _t1 .

Then, at point t ₂ , post-process B is restarted, but when both processes A and B reach the same speed, the accumulator 4 continues to descend until point t ₃ , and its descending speed is reduced until point t ₃ . The speed becomes 0 and stops descending.

After that, when entering the chasing operation range, the accumulator 4 changes direction and starts to rise, increasing the rising speed and rising at a constant speed from point t ₄ , and from the end of the chasing operation at point t ₅ , the accumulator 4 starts to rise. Stops at point ₆ , when the speed of the downstream process becomes the same as the speed of the previous process.

As described above, the movable guide roller group 4b of the accumulator 4 must be raised and lowered, but the speed must always satisfy the above formula (A).

In particular, this relationship must be maintained even when the downstream process RO slowly decelerates to a stop or slowly starts.

Furthermore, moving side guide roller group 4 when stopping and starting
In order to reduce the tension movement due to the inertia of b, it is normal to make this period relatively long.

The feature of the present invention is that a control circuit is configured to constantly satisfy equation (A) not only in a steady state but also in such a transient state, and this will be described with reference to FIG.

In the synchronized operation during steady operation, the traveling speed of the preceding process is detected by the detector 10 and sent through the ratio controller 16 as an electric signal corresponding to the traveling speed of the preceding process A. On the other hand, the detected value from the correction detector 7 is Synchronized operation is achieved by calculating the value multiplied by the detection value of the detector and controlling the speed of the motor 11 so that the running speed of the rear process B matches the sum of this value and the electric signal. The speed is increased when the dancer roller 3a descends, and the speed is decelerated when the dancer roller 3a ascends.

Next, in the case of follow-up operation, motor 1 of the downstream process
1 needs to be faster than during steady operation, so
The ratio controller 17 is switched to a ratio controller 17 having a larger multiplication factor than the ratio controller 16, and the signal passed through the ratio controller 17 is used as the speed signal of the motor 11.

The above is the well-known synchronized operation control between the front and rear processes A and B, but in the case of the above-mentioned transition period, the speed signal e ₀ of the front process A detected by the detector 12 and the correction detector 7
A command signal that satisfies the previous equation (A) is obtained by subtracting the detected value _{e 2 of} the detector 14 from this sum and multiplying the value by the ratio of the ratio controller 18. A control circuit 15 is configured to output
The rotation of the motor 9 is controlled by this command signal.

In this case, if the downstream process is decelerated or stopped,
The polarity of the output signal from the ratio controller 18 is changed so that it becomes a positive value and a negative value during chasing operation, and the positive value causes the motor 9 to move in the direction in which the moving side guide roller group 4b descends. Control is performed such that the negative value causes the drive to rise in the opposite direction.

By performing such control, the movable guide roller group 4b is raised and lowered in a manner that always satisfies the previous formula (A) during the transition period, and when it decelerates to a stop, the descending speed increases gradually, and when it comes to a complete stop, the moving side guide roller group 4b rises and falls. and descend at a constant speed,
Next, by restarting, the descending speed gradually decreases, synchronized operation occurs, and the descending stops. Then, when chasing operation starts, the ascending speed starts and the ascending speed gradually increases, and then the downstream process slows down to a constant speed. and rises at a constant speed,
When the movable guide roller group 4b approaches the intermediate predetermined position, the speed of the rear process B is decelerated to match the speed of the front process A, the ascending speed gradually decreases, and synchronized operation is reached to move to the predetermined position. The rise stops when the speed difference reaches the maximum, and thus the speed difference adjustment action of the accumulator 4 during the transition period is performed smoothly and stably.Moreover, the tension applied to the sheet S during this period becomes the load of the dancer roller 3a and maintains an appropriate and constant tension. Control is achieved.

The present invention has the above-mentioned configuration and operation, and the dancer roller 3a, which is used as a speed difference detector when synchronizing the speeds of the front and rear processes A and B during steady operation, can be used to detect deceleration and stop. Since it is also used as a control element for the accumulator 4 during transient operations such as, the control system can be simplified.

In addition, this allows the fixed side guide roller group 4b to be moved up and down accurately and stably during the transition period, thereby eliminating slack and overtension, making it possible to perform rewinding and follow-up operations under constant tension. Thus, the excellent effect of fully maintaining the quality of the sheet material is achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of a sheet processing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing the operating dynamics of the apparatus shown in FIG. 1 during a transient period. 3a...Dancer roller, 4...Accumulator, 4
a... Fixed side guide roller group, 4b... Moving side guide roller group, 9... Motor, 15... Control circuit, A... Pre-process, B... Post-process, S... Sheet-like material.

Claims (1)

[Claims] 1. A dancer roller 3a that applies a constant tension to the sheet material S is placed on the upstream side, and an accumulator 4 including a fixed side guide roller group 4a and a movable group guide roller group 4b that is actively moved up and down by a motor 9 is placed on the downstream side. A sheet-like material processing device disposed between the front process A and the rear process B, controlling the speed of the rear process B by the displacement of the dancer roller 3a, and synchronizing the speeds of both the front and rear processes A and B. In the apparatus, the displacement of the dancer roller 3a is converted into a positive value when ascending and a negative value when descending, and the total value of the speed correction amount and the sheet-like material traveling speed of the preceding process A is used to calculate the sheet-like material in the subsequent process B. The rotation of the motor 9 is controlled in order to raise and lower the moving guide roller group 4b during speed synchronized operation in a steady state at a speed obtained by dividing the traveling speed by twice the number of rollers in the moving guide roller group 4b. On the other hand, during the transition period when the downstream process RO decelerates from the speed synchronized operation including stopping, increases the speed, and reaches the speed synchronized operation, the motor 9 is actively rotated to the lowering side of the moving side guide roller group 4b, Further, during the transition period in which the speed is increased from the speed synchronized operation and then the moving side guide roller group 4b is returned to the predetermined position by reaching the speed synchronized operation, the motor 9 is actively rotated to the upward direction of the moving side guide roller group 4b. A sheet-like material speed difference matching device characterized in that it is provided with a control circuit 15 for adjusting the speed.