JP2000264517A - Tape tension fluctuation-restraining mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize tape quality to improve yield by a large margin by disposing a dancer roller between a capstan roller and a treating process. SOLUTION: As a mechanism for restraining the fluctuation of tape tension in a tape slitter line, a dancer roller 8 is disposed directly behind a winding-out roll 1. As a mechanism for restraining the fluctuation of tape tension further positively, a dancer roller 10 is disposed between a capstan roller 2 and knives 4a, 4b in a tape cutting process (a treating process). The dancer roller 10 is swingably disposed in the state of detouring a tape T with respect to a reference travel line of the tape T, in the same way as the dancer roller 8 disposed directly behind the winding-out roll 1. The dancer roller 10 is called a balance dancer roller, and both lateral ends of its rotary shaft are supported in the independently swingable state without control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for suppressing a fluctuation in a tape tension provided, for example, in a line of a tape slitter.

[0002]

2. Description of the Related Art First, a line configuration of a tape slitter for cutting a tape (for example, a magnetic tape) into a predetermined width will be described with reference to FIG.

[0003] In the drawing, 1 is an unwinding roll on which a raw tape is wound, 2 is a capstan roll (reference roll), 3 is an infeed roll, 4a and 4b are knives,
5 is a take-up roll, the rotation of each of which is controlled by a motor M. 6 is a guide roll for guiding the tape along the line.

[0004] In this line, the tape T unwound from the unwind roll 1 is sent between the tape T and the infeed roll 3 by the rotational force of the capstan roll 2,
Thereafter, it is cut (slit) by, for example, 1/2 inch width by the knives 4a and 4b, and is wound on a winding roll 5 called a pancake.

In this configuration, a plurality of sets of the knives 4a and 4b and the take-up roll 5 are arranged in the tape width direction, that is, a plurality of tapes are cut from one roll of the tape material and wound around the take-up roll 5. Is taken.

[0006] Since both ends in the width direction of the raw tape are unusable parts, the knife 4 cannot be used as a product.
After being cut at a and 4b, it is wound on a scrap roll 7 provided separately from the winding roll 5.

In the line of the tape slitter, a dancer roll 8 is disposed immediately after the unwinding roll 1 as a mechanism for suppressing the fluctuation of the tape tension.

The dancer roll 8 is arranged so as to be swingable so as to detour the tape T with respect to a reference running line of the tape, and the swing of the dancer roll 8 causes the length of the tape on the line (the length of the tape). The tape tension is adjusted by changing the travel distance.

A load corresponding to the set tape tension is applied to the dancer roll 8, and is fed back to the motor of the unwind roll 1 so as to come to the center of the swing. In this case, the speed of the motor of the unwinding roll 1 is controlled so that the tape tension is kept constant.

[0010]

However, in the above-described tape slitter, fluctuations in tape tension caused by run-out of the unwinding roll 1 (raw tape) and other rolls, mechanical loss, vibration of the motor, and the like. Is not completely absorbed by the dancer roll 8 disposed immediately after the unwinding roll 1, and is not completely cut off by the nip of the capstan roll 2, but is transmitted to the knives 4a and 4b. found.

Since the capstan roll 2 is nipped by a rubber roll, a difference in tape tension can be provided between the front and the rear, but there is no effect of attenuating the fluctuation of the tape tension on the line. The dancer roll 8 immediately after the unwinding roll 1 also absorbs the variation of the tape tension, but has no complete effect, and cannot be absorbed even when a new factor of the variation of the tape tension occurs after the capstan roll 2. .

As described above, the variation of the tape tension is not cut off by the capstan roll 2 and the knife 4 in the cutting process is used.
When transmitted to a and 4b, the cut tape has a large fluctuation in width, resulting in a cut quality defect, resulting in a decrease in product yield.

The present invention has been made to solve such a problem.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a dancer roll between a capstan roll and a processing step in a line which is processed in a processing step after a tape is fed by the capstan roll. Is arranged. In this case, the dancer roll has a structure in which both ends of the rotation shaft can swing independently.

[0015] With this configuration, the variation in the tape tension is hardly transmitted to the processing step, so that the variation in the width of the tape is suppressed to a small extent, and the tape meandering is also suppressed, so that the quality of the tape is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a line configuration of a tape slitter to which the present invention is applied. The basic configuration of this line is the same as that of the above-described conventional example of FIG.

That is, in the figure, 1 is an unwinding roll on which a raw tape is wound, 2 is a capstan roll (reference roll), 3 is an infeed roll, 4a and 4b are knives, 5 is a winding roll, and these are winding rolls. The rotation is suppressed by the motor M, respectively. 6 is a guide roll for guiding the tape along the line.

In this line, the tape T unwound from the unwinding roll 1 is fed between the tape T and the infeed roll 3 by the rotational force of the capstan roll 2,
Thereafter, it is cut (slit) by, for example, 1/2 inch width by the knives 4a and 4b, and is wound on a winding roll 5 called a pancake.

In this configuration, a plurality of sets of the knives 4a, 4b and the take-up roll 5 are arranged in the tape width direction, that is, a plurality of tapes are cut from one roll of the tape material and wound around the take-up roll 5. Is taken.

Since both end portions in the width direction of the raw tape are unusable portions as products, this portion is cut with a knife 4.
After being cut at a and 4b, it is wound on a scrap roll 7 provided separately from the winding roll 5.

In the line of the tape slitter, a dancer roll 8 is disposed immediately after the unwinding roll 1 as a mechanism for suppressing fluctuation of the tape tension. Since the dancer roll 8 is the same as the above-described conventional example of FIG. 1, detailed description will be omitted.

In particular, in the line of this embodiment, as a mechanism for more reliably suppressing the fluctuation of the tape tension, the dancer roll 10 is also provided between the capstan roll 2 and the knives 4a and 4b in the tape cutting step (processing step).
Is arranged.

The dancer roll 10 is arranged so as to be swingable in a state of circumventing the tape T with respect to the reference running line of the tape, similarly to the dancer roll 8 immediately after the unwinding roll 1. In particular, the structure is as shown in FIG.

That is, the dancer roll 10 is referred to as a balance dancer roll, and the left and right ends of the rotating shaft 10a are supported independently and swingably without control. More specifically, the dancer roll 10 is supported by bearings 13 and 14 attached to the ends of the piston shafts 11a and 12a of the low friction air cylinders 11 and 12, respectively, at both ends of the rotation shaft 10a. Due to the force of the cylinders 11 and 12, the tape T
The tape is biased in the pulling direction and settles at a position where the tape tension and the balance are maintained.

In this example, such a dancer roll 10
Is arranged between the capstan 2 and the knives 4a and 4b, the variation in the tape tension at the knives 4a and 4b is reduced, and the cutting quality of the tape is stabilized.

That is, the fluctuation of the tape tension caused by the run-out of the unwinding roll 1 cannot be completely removed by the dancer roll 8 immediately after the unwinding roll 1, and the capstan sour 2 is not completely cut off by the capstan. But also after dance roll 2, where dancer roll 1
Since 0 swings according to the change in the tape tension, the change in the tape tension is absorbed, and is hardly transmitted to the knives (cutting process) 4a and 4b. For this reason, the width variation occurring in the tape cut by the knives 4a and 4b is suppressed to be small, and a tape with stable cutting quality can be obtained.

The dancer roll 10 has its rotating shaft 10
Since both ends of a can swing independently of each other, the tape can be run in a well-balanced manner, so that not only the width fluctuation occurring in the tape but also the tape meandering can be suppressed.

Table 1 shows the results of a test using an actual tape slitter.

[Table 1]

The tape cut by this tape slitter has a width accuracy of 12.65 ± 0.005 mm and a meandering value accuracy of 3
Although it was necessary to satisfy the standard of 0 μm or less, the average value and the σ value (standard deviation) were conventionally poor, whereas in this example, it can be seen that both were greatly improved. In this example, a stable numerical value could be obtained over the entire length of the tape as compared with the related art. As a result, in the tape slitter of the present example, the conventional tape dimensional accuracy defect of about 35% was reduced to about 2%.

As described above, in the tape slitter of this embodiment,
Between the capstan roll 2 and the knives 4a, 4b, a dancer roll 1 in which both ends of the rotation shaft can swing independently.
By arranging 0, fluctuations in the width and meandering of the cut tape can be reduced, and as a result, the cutting quality of the tape is stabilized, leading to a significant improvement in yield. Also,
Since the dancer roll 10 does not use electric control, the equipment cost is low and the dancer roll 10 can be easily introduced.

In the above example of the tape slitter, only the tape cutting step is shown. However, in practice, other sections such as a tape cleaning step are provided continuously. In this case, by arranging the dancer roll 10 for each section,
Variations in tape tension in each section can be effectively suppressed, and overall tape quality can be improved.

The present invention is not limited to the illustrated tape slitter, but can be applied to any converting machine such as a coater and a calendar.

[0033]

As described above, according to the present invention, variation in tape width and meandering can be suppressed, so that the quality of the tape can be stabilized and the yield can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a line of a tape slitter showing a conventional example.

FIG. 2 is a configuration diagram of a line of a tape slitter to which the present invention is applied.

FIG. 3 is a perspective view showing the structure of a dancer roll.

[Explanation of symbols]

T ‥‥ tape, 1 ‥‥ unwind roll, 2 ‥‥ capstan roll (reference roll), 4a, 4b ‥‥ knife (processing step), 5 ‥‥ take-up roll, 10 ‥‥ dancer roll, 10a ‥‥ rotation Shaft, 11, 12 ‥‥ air cylinder

Claims (2)

[Claims] 1. A tape tension variation suppressing mechanism provided in a line processed in a processing step after a tape is fed by a capstan roll, wherein a dancer roll is arranged between the capstan roll and the processing step. A tape tension fluctuation suppressing mechanism. 2. The tape tension fluctuation suppressing mechanism according to claim 1, wherein said dancer roll has both ends of a rotation shaft supported independently and swingably.