JPS5846424B2 - Accumulator for absorbing speed differences in sheet materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to absorb the speed difference when a temporary change in processing speed occurs between the front process and the back process of a sheet-like material running line. The present invention relates to an accumulator for absorbing the speed difference of a sheet-like object, which enables stable running, and in particular maintains a weak constant tension on the sheet-like object between front and rear steps.

This type of accumulator is widely used in sheet-like material running lines such as film manufacturing and winding processes. The speed is reduced, during which the sheets sent from the previous process are stored, and after the rewinding is completed, the rewinding speed is made faster than the previous process, so that the stored sheets are emptied and the next rewinding is performed. Measures such as preparing for disasters have been practiced for a long time.

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 left on standby and then lowered when necessary to store the sheet.In this case, a counterweight is attached to the lifting roller group to balance the force with the sheet tension. In the so-called driven type 0 type structure, there is a difference in the tension applied to the sheet when the roller group on the lifting side has reached its upper limit and when it is being lifted and lowered, and there is a difference in the tension applied to the sheet between the front and rear processes. Even if speed synchronization was carried out with high precision, the quality of the product was adversely affected due to tension disparity, which was undesirable.However, in this type of accumulator, the difference in weight between the total weight of the guide roller group on the lifting side and the counterweight is minimized. Theoretically, it is possible to maintain a small amount of tension by using a counterweight, but since the mechanism for raising and lowering the elevating guide roll group inevitably produces resistance due to mechanical loss, this is difficult to balance the weight by using a counterweight. This has an effect on the device itself as a dead zone inherent in the device, and since this acts as a tension component on the sheet-like material, there is a limit to the ability to maintain minute tension.

In addition, if the total weight of the guide roll group and the weight of the counterweight becomes considerably large, this will act as inertia when the lifting guide roll group begins to move or stop, resulting in speed changes like this. During movement, there was an unavoidable problem that especially tension fluctuations occurred, which adversely affected the sheet-like material.

In order to solve this problem, some methods have been adopted to balance the air pressure by adjusting the air pressure using an air cylinder, but this method still causes errors due to resistance in the sliding parts and problems in terms of speed synchronization. However, due to the difficulty of maintaining a constant tension, it was still impossible to maintain the tension, which made it unsuitable for practical use.

The present invention deals with this fact, fundamentally eliminates the various defects of conventional accumulators of this type, and reduces the tension applied to the sheet material regardless of changes in the speed at which the sheet material enters and exits. The invention was developed in order to provide an improved accumulator that can be maintained at a weak constant level.

However, the present invention has discovered that there is a correlation between the lifting speed of the guide roller group on the lifting side and the speed difference of the sheet-like material between the inlet and outlet sides of the accumulator, and based on this relationship, the lifting and lowering It is characterized by the fact that it has achieved this objective by adopting an active lifting method that appropriately controls the lifting speed of the side guide roller group.

Hereinafter, the specific contents of the present invention will be explained in detail with reference to one embodiment shown in the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a feeding device provided at the rear end of the sheet feeding process, which includes a pair of rollers 1a.

A nip roller consisting of 1b is driven by a motor M1,
The sheet 2 sandwiched between the rollers la and lb is continuously fed in the direction of the arrow at a predetermined speed.

Reference numeral 3 denotes a feeding device provided at the front end of the sheet feeding process, in which a nip roller consisting of a pair of rollers 3a and 3b is driven by a motor M2, and the sheet 2 sandwiched between both rollers 3a and 3b is moved at the predetermined speed. Although it is not shown in the drawings, it is fed in the direction of the arrow at a synchronized speed and is fed to a winding machine as a processing machine.

4 is a dancer roll, and its swing displacement is measured by a differential transformer 5.
Take out both motors M1. It is used as a speed synchronization signal between M2.

An accumulator 6 according to the present invention is included between the feeding device 1 and the feeding device 3, and as shown in the figure, this accumulator 6 includes a plurality of guide rolls γa to 7.
d is rotatable around each axis, and a group of fixed rolls 7 are arranged horizontally parallel to each other and at a predetermined level, and a plurality of guide rolls 8a to 8c are rotatable around each axis. A lift-side roll group 8 which is arranged horizontally parallel to each other with their axes parallel to each other and has an integral structure with a support frame 9, and which can be raised and lowered simultaneously in the approaching and separating directions while maintaining parallel to the fixed-side roll group 7. , a drive motor 10 that raises and lowers the roll group 8;
It is constructed with an output device 11 that reversibly rotates the motor 10 as an element.

An example of an elevating device provided between the elevating side roll group 8 and the drive motor 10 is as follows.

The elevating side roll group 8 includes 1 rollers connected to both ends of the support frame 9.
While suspended by a pair of roller chains 16a, 16b, both roller chains 16a, 16b are suspended by chain wheels 18a, 19a.
If necessary, balance weights 17a and 17t) are strung endlessly between roller chains 16a and 16b, and both roller chains 16a and 18b are suspended endlessly.
, 16b have an interlocking structure in which the chain wheel 18a is pivotally connected to the motor 10 by ordinary mechanical means.

The drive motor 10 is of a variable speed type, for example, a shunt DC motor, from the viewpoint of good rotation control performance.
The braking device 20 normally performs braking by interposing the
The elevating roller group 8 is fixed so that it can function as a general guide roll.

On the other hand, an output device 1 for rotating the drive motor 10
As shown in the figure, an example of the structure of the electric control system according to No. 1 includes a first manual signal system that converts the sheet speed on the feeding device 1 side into an electric signal via a rotary generator 12 and a signal level setter 14, and A second human power signal system converts the rotational speed of the drive motor 10 into an electrical signal via the transformer 5 and the signal level setter 15, which corresponds to the speed difference between both devices 1.2, and a rotary generator 13. A closed-loop control system is configured in which a three-man power system is inputted to the output device 11, including a feedback signal system that converts the signal into a feedback signal system.

With such a control system, an output corresponding to the speed difference between the two devices 1.2 is sent to the drive motor 10 via the output device 11 based on the sheet speed on the feeding device 1 side.
The motor 10 is rotated forward or reverse at a predetermined speed as will be described later, thereby raising or lowering the lifting roll group 8.

Next, the mode for controlling the elevation of the elevating side roll group 8 will be explained.
If the sheet speed on the side (similarly converted by the rotational speed of the nip roller) is V', then, for example, if the sheet 2 leaving the accumulator 6 is stopped due to the stoppage of the winding machine in the next process, v' 20, and in this state, it is necessary to lower the elevating roller group 8 and store the sheets 2 in the accumulator 6.

In this case, the descending speed of one guide roller V-8a of the elevating roller group 8 is T, that is, it should be 100. Therefore, in the accumulator 6 as a whole, the descending speed of the elevating roller group 8 is V. Hato becomes.

If this descending speed V is expressed in a general formula, then when the feeding side is fast, V>O1 and when the feeding side is slow, it shows the value of Alternatively, the roll group 8 on the elevating side may be lowered or raised by actively driving in reverse.

In this way, the tension applied to the sheet 2 can always be kept constant regardless of whether the elevating roll group 8 is being elevated or stopped.

It goes without saying that the tension T in this case is expressed as follows, where the combined weight of the lifting roll group 8 and the total weight of the W1 balance weights 17a17b are W'.

In this way, the accumulator 6 is effectively operated in a transient state where the sheet running speeds on the feeding side and the feeding side are greatly different, while the lifting side roll group 8 is braked during steady state when synchronized operation is performed. By the device 20,
For example, speed matching between the two motors M12M2 may be performed while fixing it at a position above the dotted line and functioning as a guide roll.

Next, in FIG. 2, another example of the accumulator 6 according to the present invention is schematically shown, in which a comb-shaped support frame 9' is used for the support frame 9 of the lifting roll group 8, and the accumulator 6 is fixed in a recessed part. Guide roll 7b of side roll group 7.

7c enters, while the roll support part and guide roll 8
a to 8c are formed so that they can pass through gaps between guide rolls 7a to 7d and move upward.

With this structure, each of the guide rolls 7a to 7d, 8 of the accumulator 6 is activated at the beginning of work when the sheet 2 that has passed through the feeding device 1 is transferred to the feeding device 3.
It is possible to eliminate the troublesome operation of passing the sheet 2 in a hairpin shape between a to 8c.

That is, with the accumulator 6 in the state shown in the second figure, the sheet 2 is passed straight between both roll groups 7 and 8, and then the lifting side roll group 8 is pulled down to a predetermined position. Hanging and passing is extremely easy.

The accumulator of the present invention has the configuration and function described above, and is based on the fact that there is a specific relationship between the speed difference between the inlet and output sides of the accumulator and the lifting speed of the lifting side roll group 8. Since the roll group 8 is actively moved up and down, it is possible to keep the tension applied to the sheet-like object constant at all times, both when the accumulator is activated and during synchronized operation on the inlet and outlet sides. , a sheet-like material with uniform properties can be obtained, which plays an extremely important role in improving quality.

In particular, the present invention absorbs the speed difference between the front and rear processes by actively moving the lift-side roll group up and down, so it is possible to omit the counterweight required by the well-known driven type. Therefore, it is possible to reduce the mechanical loss of the accumulator, and also to suppress the adverse effects of inertia as much as possible, and to make the tension as weak as possible when there is a difference in sheet speed between the front and rear processes. In addition, it is possible to maintain the sheet-like material at a constant value without causing it to sag or to be excessively stretched, making the accumulator suitable as an adjustment mechanism for a sheet-like material having extensibility.

In addition, when performing intermittent operation in the processing process on the feeding side, there is the advantage that it can be done smoothly and easily without having to pay attention to continuous operation on the feeding side, and it is extremely useful for promoting automation. It is a great accumulator with a lot of practical value.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the main part structure of a sheet-like material processing apparatus according to an embodiment of the accumulator of the present invention, and FIG. 2 is a schematic diagram of the main part structure of an example of the accumulator of the present invention. 1...Feeding process, 2...Sheet-like material, 3...Feeding process, 6...Accumulator, 7...Fixed side roll Group, 7a-7
d... Guide roll, 8... Lifting side roll group, 8a to 8c... Guide roll 10.
... Drive motor, 11 ... Output device.

Claims (1)

[Claims] 1. A fixed side roll group I in which a plurality of guide rolls 7a to 7d are rotatable around each axis and arranged horizontally parallel to each other at a predetermined level, and a plurality of guide rolls 8.
A to 8c are freely rotatable around each axis, and are arranged horizontally parallel to each other so that they can be raised and lowered simultaneously in the approaching and separating directions while maintaining parallel to the fixed roll group 7. A roll group 8, a drive motor 10 for raising and lowering the elevating roll group 8, and an output device 1 for reversibly reversing the drive motor 10.
1, and the sheet-like material 2 is distributed between the feeding process and the feeding process of the sheet-like material 2, and the sheet-like material 2 is transferred to each guide roll 73 to 7d of the fixed side roll group 7 and each guide roll of the elevating side roll group 8. 83 to 8c, and when there is a difference between the speed of the sheet material in the feeding process and the speed of the sheet material in the feeding process, the elevating side roll group 8 is raised or lowered by the output device 11. and the output of the output device 11 is controlled so that the elevating speed matches the value obtained by dividing the difference between the speeds of the two sheet-like objects by twice the number of guide rolls in the group of elevating rolls 8. An accumulator for absorbing speed differences of sheet-like materials.