JPS6343294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling sheet storage device, and more specifically to a sheet storage device provided between a continuous sheet supply source that supplies sheets without interruption and a supply destination that uses the supplied sheets intermittently. The purpose of this device is to store and discharge sheets with an appropriate uniform tension, especially sheets that are easily deformed and easily cut, such as resin films.

This type of sheet storage device generally hangs sheets in a zigzag pattern between a large number of stationary rollers and lifting rollers, and when storing the sheets, the lifting rollers are lowered, and when discharging the sheets, the lifting rollers are raised. In this case, the lifting roller generally applies tension to the sheet by its own weight.

However, with this conventional sheet storage device, it is not possible to control a sheet such as a very thin resin film to be stored and discharged with a small uniform tension from beginning to end.

There is also a method in which the sheet is simply allowed to freely stagnate in the storage chamber without using any lifting rollers, but this method cannot be applied to extremely thin films that have uneven internal stress.

Therefore, the present invention puts the storage sheet under sufficient tension control in the same way as normal tension control of traveling sheets. Tension fluctuations are kept to a minimum even when starting.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 is a schematic explanatory diagram of the present invention, and FIGS. 2 to 5 are a front view, a plan view, a side view, and a parts diagram of one embodiment, respectively. The main parts thereof include a continuous sheet supply source that continuously supplies the belt-shaped sheet S, a pinch roller 18 as a sheet take-up mechanism that takes over the sheets supplied from the continuous sheet supply source, and a drive mechanism (motor) for the pinch roller 18. ) 18a, a plurality of stationary rollers 1a and a plurality of lifting rollers 1 are provided in the sheet supply path between the supply source and the pinch roller 18, respectively.
b, a sheet storage mechanism 1 including a motor 7, etc. as an elevating drive mechanism for elevating and lowering the elevating roller 1b at a predetermined speed, and a motor 14, etc. as an elevating drive mechanism provided in the sheet supply path on the front side of the sheet storage mechanism 1. a first dancer roller 2 and its tension automatic control section 19; a roller position detection section 20 that detects the positional displacement of the first dancer roller 2; and a lifting mechanism provided in the sheet supply path on the rear side of the sheet storage mechanism 1. A second dancer roller 2' with a motor 14' etc. as a driving mechanism and its tension automatic control section 19'
and a roller position detection section 20' that detects the positional displacement of the second dancer roller 2', and when the pinch roller 18 is not taking up sheets, drives the motor 7 of the sheet storage mechanism 1 to lower the elevating roller. As a result, the sheets S supplied from the continuous supply source are stored, and the first dancer roller 2
The drive speed of the motor 7 of the sheet storage mechanism is controlled to hold the first dancer roller 2 at a predetermined position in response to a position displacement detection signal from the roller position detection section 20 of At the start of collection, the sheet storage mechanism 1
A first controller 21 drives the motor 7 at a drive speed corresponding to a take-up speed faster than the sheet supply speed to raise the elevating roller, thereby releasing the stored sheet S, and the pinch roller 18 starts taking the sheet. At this time, the motor 18 of the pinch roller 18 receives a positional displacement detection signal from the roller position detection unit 20' of the second dancer roller 2' to hold the second dancer roller 2' at a predetermined position.
This is a second control device 22 that controls the driving speed of the motor a.

More specifically, the sheet storage mechanism 1 includes a plurality of stationary rollers 1a and a plurality of lifting rollers 1b, and serves as a lifting drive mechanism for lifting and lowering the lifting frame 3 on which the lifting rollers 1b are arranged side by side. It is equipped with a book guide column 4, four annular chains 5 attached to four places on the lifting frame, chain wheels 6, 6, one chain drive motor 7, a balance weight 8, etc. The motor 7 is adapted to rotate passive chain wheels 6a, 6a having chain axles on both sides.

The bearing portion of each lifting roller 1b of the lifting frame 3 is located at the tip of the bracket 3a that extends upward, so if this is pulled up sufficiently, the lifting roller 1b will move to the stationary roller 1a.
The traveling sheet S is now located higher up, and can travel straight without contacting the lifting rollers 1b. Of course, when the pinch roller at the supply destination stops taking up the sheets, the elevating roller 1b is lowered to accumulate the sheets.

The stationary rollers 2a and 2b of the first dancer roller 2 and the second dancer roller 2', like the stationary roller 1a of the storage mechanism, are attached to the lower surface of the beam member 9 that connects the upper ends of the guide columns 4, and each of the stationary rollers 2a and 2b of the first dancer roller 2 and the second dancer roller 2' The dancer rollers pass through and exit upward. As a result, like the storage mechanism 1, the sheet S can be moved straight during steady operation of the sheet supply destination. Both side bearings of the first and second dancer rollers move up and down along a vertical guide rail 10 fixed to the guide column 4 via an intermediary material 4a. Like the storage mechanism 1, this dancer roller elevating drive mechanism for elevating and lowering the bearing includes a chain wheel 11 standing on the beam 9, an annular chain 13 hung between the chain wheels 12 attached to the lower part of the guide column 4, and its drive motor. 14 or 14' are provided. The bearings at both ends of each dancer roller are structured so that they can pass from the upper end of the rail 10 between the two stationary rollers 2a, 2b, exit upwards, and return downwards.

The hook 15 in Fig. 5 shows the side view of the one in Fig. 2, and is operated by a fluid pressure cylinder 16 attached to a bracket on the beam 9, and lifts the lifting frame at the top as shown by the chain line in Fig. 5. Hook.

This happens after all the stored sheets are released.
This is effective in that it is not necessary to rely on the brake attached to the motor 7 to hold the elevating frame 3 in that position when the sheet is moved straight for a long period of time due to steady operation at the destination.

Now, in this invention, in addition to the configuration of the mechanical parts described above, the important functions are the first control device 21 and the second control device 22, which will be explained with reference to FIG. In this case, the actual sheet supply destination is the sheet winder 17, and the sheet take-up device is the pinch roller 18.

The elevating/lowering (frame) drive mechanism of the storage mechanism 1 is represented by the motor 7 shown in FIG. The first dancer roller 2 on the front side is provided with an automatic tension control section 19 and a roller position detection section 20, respectively, and the second dancer roller 2 on the rear side is provided with an automatic tension control section 19 and a roller position detection section 20, respectively.
The tension automatic control unit 1 is also installed on each dancer roller 2'.
9' and a roller position detection section 20' are attached. The two automatic tension controls 19, 19' are in this case magnetic particle clutches. By means of this magnetic powder clutch, the force with which the motors 14, 14' constantly pull the first and second dancer rollers upward through the chain 13 can be maintained at a predetermined value. Therefore, the tension of the sheet during storage can be automatically controlled to the required values by the dancer roller 2, and the tension of the sheet while being taken up can be automatically controlled to the required values by the dancer roller 2'. The raising and lowering of both dancer rollers 2, 2' depends on the difference between the sheet tension in the supply path, that is, the sheet tension suspending the dancer rollers, the pulling force by the motors 14, 14', and the gravity.

The roller position detection units 20 and 20' of both dancer rollers are well-known devices that output respective signals when the dancer roller descends from the standard position (for example, the intermediate position on the rail 10) and when it rises. A simple limit switch is sufficient.

Control device 21 for the lifting drive motor 7 of the storage mechanism 1
The motor 7 is operated at the required lifting and lowering speeds when starting to take over the sheet supply destination and when stopping. In other words, when the pinch roller 18 is not taking up the sheet, a sheet storage speed corresponding to the amount of taking up is required. Specifically, if the sheet running speed from the supply limit is V and the number of lifting rollers 1b is N, then the descending speed of the lifting rollers 1b is approximately V/2N.

Furthermore, at the start of take-up, if the take-up speed is v, the rising speed of the lifting roller 1b is approximately (v-
V)/2N. When the stored sheets are exhausted, the take-up speed v is made to match the supply speed V, and the sheets S are stopped at the top of the lifting roller 1b and passed through.

Therefore, the sheet supply speed V and the take-up speed v at the start of take-up are set in advance to the control device 21 of the storage mechanism 1, or both speeds are inputted as shown by the dotted line in the figure. According to the above calculation, motor 7
Alternatively, the rotation direction and rotation speed are instructed to the drive mechanism.

However, the control of the storage mechanism 1 is only a general one, and the influence of the inertia of the elevating section is large.
There is a risk of temporary harmful tension in the reservoir sheet. The front and rear first dancer rollers 2 and second dancer rollers 2' prevent this.

That is, as described above, the first dancer roller 2 and the second dancer roller 2' are both operated by an automatic tension control section, in this case, the magnetic particle clutches 19 and 1.
When the sheet tension is maintained at an optimum value by 9', the sheet tension is set at the standard position, and a predetermined tension is applied to the sheet being stored or taken. Therefore,
If the sheet tension fluctuates because the lifting speed of the lifting roller 1b of the storage mechanism 1 is not appropriate, this will cause the first dancer roller 2 or the second dancer roller 2'
is displaced upward or downward to absorb the fluctuation. Furthermore,
The displacement of the first dancer roller 2 is detected by the roller position detection section 20, and the signal is sent to the lifting drive mechanism control device 21 of the storage mechanism 1, and the displacement of the second dancer roller 2' is detected by the roller position detection section 20. Part 2
0', the signal is sent to the control device 22 of the motor 18a of the pinch roller 18, and fine adjustments are made through feedback control thereof.

When the winding machine 17 completes winding, the pinch roller 18 stops taking up the sheet in order to replace the winding shaft. At this time, the lifting frame 3 of the storage mechanism 1 is lowered at a predetermined speed by the city control device 21 and the motor 7, but the lowering speed tends to be insufficient at first. Then, the sheet supply speed exceeds the storage speed, and the storage sheet tension decreases, causing the first dancer roller 2 to descend. Therefore, the position detection section 20 immediately issues a speed increase command to the control section, but it takes some time for the sheet tension to actually recover. Therefore, the first
The vertical guide rails 10 of the dancer rollers 2 are elongated as shown and serve as a buffer against sudden changes.

When the winding machine 17 installs a new winding shaft and the pinch roller 18 starts taking up the sheet to resume winding, the stored sheet is discharged, but the winding speed is initially increased for a while, and the speed difference mentioned above is The storage sheet is used up by v-V. At this time, the first control device 21 raises the elevating frame 3 of the storage mechanism 1 at a speed commensurate with the speed difference. However, as in the case of suspension, the tension of the storage sheet becomes too high or too low due to the rising speed of the lifting frame 3, and the second dancer roller 2' on the rear side
is displaced from its standard position. In this case, as in the case of rest, the position detection unit 20' attached to the second dancer roller 2' detects and sends a signal, and the second dancer roller 18
A command is given to the control device 22 to perform feedback control of the take-up speed.

As a result, the tension of the storage sheet, which tends to fluctuate during the transient period, is maintained at the required value, and when the storage sheet is eventually exhausted, the role of the storage mechanism 1 is completed, and the second control device, which controls the driving speed of the pinch roller, controls the take-up speed. It shifts to steady operation by matching the sheet feeding speed.

Although the invention has been explained above using one embodiment, it goes without saying that the present invention can be varied and applied in various ways according to design conditions without changing its gist.
For example, the lifting roller and the dancer roller may approach the stationary roller from above instead of from below.

Conventionally, when continuously producing and winding sheets such as ultra-thin resin films that are easily locally deformed and cut, and which are not necessarily homogeneous over the entire surface, it is necessary to stop and restart the winding machine due to changes in the winding shaft and other operations. This invention eliminates the problem of tension fluctuations that adversely affected product quality.

The sheet storage mechanism does not raise and lower the elevating section using the weight of the elevating roller and the amount of stored sheets, but mechanically raises and lowers the elevating section at a calculated speed, so that the tension of the sheets being stored can be actively controlled. In addition, first and second dancer rollers are provided on the front and rear sheet travel paths of the storage mechanism, and these are also moved up and down mechanically, so by controlling the mechanical force, the tension of the storage sheet can be automatically controlled. In addition, the nimble dancer roller can control the relatively heavy storage mechanism through feedback control. When the first dancer roller on the front side is not taking up the sheet, and the second dancer roller on the rear side is at the start of taking up the sheet, it acts as a buffer against sudden changes in sheet tension and quickly compensates for fluctuations from the set stored tension by vertical displacement. Compared to the case where the dancer roller is present only on one side, the storage sheet tension control effect is significantly greater.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a schematic image control mechanism of this invention, FIG. 2 is a front explanatory diagram of an embodiment of this invention,
Figures 3 and 4 are a schematic plan view and front view, and Figure 5 is a schematic plan view and front view.
The figure is a side view of the hook of FIG. 2. 1... Sheet storage mechanism, 1a... Stationary roller,
1b... Lifting roller, 2... First dancer roller, 2'... Second dancer roller, 7... Motor,
14, 14'...Motor, 18...Pinch roller,
18a...Motor, 19, 19'...Tension automatic control section, 20, 20'...Roller position detection section, 21
...First control device, 22...Second control device, S...
...band-shaped sheet.

Claims (1)

[Claims] 1. A continuous sheet supply source that continuously supplies strip-shaped sheets, a sheet take-up mechanism and its driving mechanism that takes over the sheets supplied from the continuous sheet supply source, and a sheet supply path between the supply source and the take-up mechanism. a sheet storage mechanism provided with a plurality of stationary rollers, an elevating roller, and an elevating drive mechanism for elevating and lowering the elevating rollers, and a first dancer roller with an elevating drive mechanism provided in a sheet supply path on the front side of the sheet accumulating mechanism. and a tension automatic control unit thereof, a roller position detection unit that detects a positional displacement of the first dancer roller, a second dancer roller with an elevating drive mechanism provided in the sheet supply path on the rear side of the sheet storage mechanism, and its tension. an automatic control unit; a roller position detection unit that detects a positional displacement of the second dancer roller; and a roller position detection unit that drives an elevating drive mechanism of the sheet storage mechanism when the sheet take-up mechanism is not taking up sheets, so that the sheets are supplied from a continuous supply source. The first dancer roller receives a positional displacement detection signal from the roller position detection section of the first dancer roller.
The driving speed of the elevating drive mechanism of the sheet storage mechanism is controlled to hold the dancer roller at a predetermined position, and when the sheet take-up mechanism starts taking up sheets, the elevating drive mechanism of the sheet storage mechanism is controlled to take up the sheet at a speed faster than the sheet supply speed. a first control device that discharges sheets stored in the storage mechanism by driving at a drive speed corresponding to the speed; and a position displacement detection signal from a roller position detection unit of the second dancer roller when the take-up mechanism starts taking up the sheets. a second control device that controls a drive speed of a drive mechanism of the take-up mechanism so as to hold the second dancer roller at a predetermined position in response to the second dancer roller.