JPH07117906A - Tension control device for in-line double winding machine - Google Patents

Abstract

PURPOSE:To accurately detect the individual tension of the right and left sheets on a half-split sheet winding line. CONSTITUTION:In this tension control device for an in-line double winding machine splitting a belt-like body into two in the width direction on a molding/ winding line of the belt-like body such as a plastic film or a sheet and winding the split belt-like bodies 1a, 1b to the right and left respectively, tension sensors 5a, 5b detecting the tension of both belt-like bodies 1a, 1b via one tension roll 2 wound with both split belt-like bodies 1a, 1b are arranged near the center in the width direction of the split belt-like bodies 1a, b respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension control device for an in-line two-sheet winding / winding machine in a molding device for a belt-shaped body such as a plastic film or a sheet.

[0002]

2. Description of the Related Art Generally, in a molding apparatus for a band-shaped body such as a plastic film or a sheet, the molded band-shaped body is sequentially wound around a bobbin shaft. FIG. 17A shows a state in which the formed sheet is wound in one sheet.

However, when forming a narrow sheet, the sheet is divided into two in the width direction in the sheet forming and winding line in order to save a slitting machine in the subsequent step, and the divided sheet is divided into right and left. There are also two in-line rolls that are wound separately.

That is, (b), (c) of FIG.
(D) is a conceptual diagram of the above-mentioned in-line two-piece winding, (b) is a tandem winding individual shaft two-piece winding, (c)
Shows a state where two coaxial sheets with a hollow are taken, and (d) shows a state where two coaxial sheets without a hollow are taken.

By the way, in a film sheet having a low Young's modulus and being easily stretched, it is relatively easy to wind a plurality of rows of sheets slit in the width direction on the same bobbin shaft because the tension can be controlled by the same tension control in all rows. Therefore, it is not necessary to individually detect and control the tension in each row.

However, in the case of a film sheet having a high Young's modulus and being difficult to stretch, it is very difficult to wind a plurality of rows of sheets on the same bobbin shaft with the same tension. This is because the error in the winding length of each row cannot be absorbed by elongation,
In this case, tension management and control for each row is required.

Conventionally, as a method of winding a high Young's modulus sheet in a plurality of rows in-line, the following method has been adopted.

1. A method in which a plurality of winding machines or a winding machine having a plurality of shafts or more is used to wind each row sheet on each bobbin shaft having a motor by controlling each tension.

2. Although it is on the same axis, a bobbin shaft divided in the width direction is connected by a slip mechanism or the like to absorb a winding length error of each row sheet, that is, a friction shaft method. The end of one bobbin shaft is supported concentrically with the end of the other bobbin shaft by bearings, or the opposite ends of each bobbin are also supported by center supports, etc. A method of rotating by separate drive systems.

However, in the above-mentioned first method, there is a problem in that the equipment becomes complicated and oversized, and the merit of in-line multiple picking diminishes due to equipment cost, space, and the like. In the second method, the torque adjustment accuracy of the slip mechanism is low, and the tension feedback control of individual rows cannot be performed, so that there is a problem that good winding cannot be obtained. On the other hand, the third method is more advantageous than the first method in terms of equipment scale, and has advantages such as better winding than the second method. It is an easy method,
There is a problem that it is difficult to detect the tension of each of the left and right sheets individually after separating the sheets and before winding.

FIG. 18 is a conceptual view showing a state in which two sheets divided in the width direction after forming are wound around a bobbin shaft. The divided sheets 1a and 1b are tension rolls 2 respectively.
And is wound on bobbin shafts 4a and 4b which are respectively driven by separate motors 3a and 3b.

Therefore, it is necessary to accurately grasp the actual tension of each of the divided sheets in order to control the winding quality of the sheet, including the method of performing the winding method as shown in FIG. As a method of detecting the individual tensions, as shown in FIG. 19A, one tension roll 2 is used, and tension sensors 5a and 5b are provided at both ends of the one tension roller. Tension rolls 2a, 2 divided into about half width as shown in (b) of FIG.
A method of providing tension sensors 5a, 5b, 5c, 5d at both ends of b, or as shown in FIG. 19 (c), two tension rolls 2a, 2b longer than full width or full width are positioned relative to each other. The tension rolls 2
The method of providing the tension sensors 5a, 5b, 5c and 5d at both ends of a and 2b is adopted.

[0013]

However, the one shown in FIG. 19 (a) can be applied to a sheet with respect to the tension of each full-width divided sheet without division, and the left and right sheet widths can be arbitrarily set. It has good operability, but has problems such as poor tension detection accuracy. Further, although the one shown in (b) of FIG. 19 has good tension detection accuracy, it requires punching out of the sheet in order to keep the interval between the two divided sheets at a predetermined value or more, and a restriction on the change of the left and right sheet width dimensions. There are problems such as Further, the one shown in (c) of FIG. 19 has good tension detection accuracy, but has a problem that the paths of the left and right sheets are changed.

In view of the above, the present invention provides a tension control device capable of accurately detecting the individual tensions of the left and right belt-like bodies such as sheets in the two-division winding line without the above-mentioned problems. The purpose is to get.

[0015]

SUMMARY OF THE INVENTION According to the present invention, a strip-shaped body such as a plastic film or a sheet is divided into two in the width direction in a molding and winding line, and the divided strip-shaped body is wound to the left and right respectively. In the tension control device for the in-line two-sheet winding machine, a tension sensor for detecting the tension of the two strips is wound through one tension roll around which the two strips are wound. It is characterized in that they are respectively arranged near the center of the strip in the width direction. A second aspect of the present invention further displays the tension signal detected by the tension sensor corresponding to each strip and feeds it back as a tension control feedback signal to the winding motor for each divided strip. Is characterized by.

[0016]

During the winding operation of each strip, the tension of each strip is detected by the tension sensor arranged near the widthwise center of each strip. Therefore, by feeding back this detection signal to the winding motor for each divided strip, the two-divided strip can be wound with an appropriate tension, and a good winding roll can be obtained.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic structure of a tension roll portion in a two-part sheet winding device. As shown in FIG. 1 (a), the two-part sheets 1a and 1b are attached to guide rolls 6 and 7, respectively. It is wound around and further wound around the lower surface of the tension roll 2, and then moves to a winder (not shown) via the guide roll 8.

By the way, the tension roll 2 is pivotally supported at its both ends by bearings 10a, 10b suspended from both ends of the tension roll support member 9, as shown in FIG. The tension roll support member 9
Are left and right side walls 12a and 12b that are erected on the base 11.
It is hung from a horizontal rail 13 provided between the tops of the rails, and tension sensors 5a and 5b are interposed between the horizontal rail 13 and the tension roll support member 9. That is, the two sheets 1a and 1b divided on the lower surface thereof are wound around the tension roll 2 so as to come into pressure contact with each other, and the tension roll 2 is placed at a position corresponding to a substantially central position in the width direction of the respective sheets 1a and 1b. The tension sensors 5a and 5b are provided respectively.

Therefore, the above-described embodiment of the present invention is compared with the tension roll 2 in which a tension sensor is provided between the both ends of the tension roll 2 and the cross rail (corresponding to (a) of FIG. 19).

That is, the total length of the tension roll 2 is 3
In the case of 000 mm, when two sheets each having a sheet width of 1220 mm are centrally distributed (A), each sheet width is 800
Tension between the left side and the right side in three cases when the two sheets with the width of 2 mm are distributed to the center (B), and when the center of the sheet having the width of 1270 mm and the sheet having the width of 1070 mm are offset by 100 mm (C). Table 1 shows the results of trial calculation of detection accuracy with different levels.

[0022]

[Table 1] By the way, FIG. 2, FIG. 3, and FIG.
It is a figure corresponding to three cases of (B) and (C), (a) shows the conventional system, (b) shows the system by this invention, respectively.

Therefore, in each case, the position of the tension sensor is continuously moved from the position of 100 mm outside the roll shaft end to the center side (to the vicinity of the center of each of the two sheets), and the assumed true value at each position is obtained. The estimated accuracy is shown in FIG. 5 to FIG. 15, as shown in the corresponding figure in Table 1.

The assumed true value is the actual tension of each sheet. In FIGS. 2 to 4, the width of each sheet 1a, 1b is LA,
When the tension level of LB is WA and WB, LA × WA,
LB × WB. The assumed detection value is a measurement value obtained by simulating the reaction force exerted on the tension sensors 5a and 5b by the left and right sheet tensions on the basis of the reaction force of the tension roll support member.

Further, in FIGS. 5 to 15, + is the accuracy of the left side for internal installation, Δ is the accuracy of the right side for internal installation, × is the accuracy of the left side for external installation,
▽ represents the accuracy of the right side installed outside.

Considering the above FIGS. 5 to 15,
When there is a difference in tension between the left and right sides of the two-divided sheet and the sheet is divided into two symmetrically with respect to the roll center, the tension sensor position is set inside the roll to improve the detection accuracy. It can be seen that the closer to the center of each sheet, the better the detection accuracy. On the other hand, when the sheet is divided into two asymmetrically with respect to the center of the roll, even if the position of the tension sensor is set inside the roll, if the two tension sensors are arranged by the center distribution of the roll, the detection accuracy can be improved. However, in this case, the accuracy of detection can be expected to improve by arranging the sheets with the center of each sheet width as a reference.

FIG. 16 is a conceptual diagram of the tension control device according to the present invention, in which the detection signals of the tension sensors 5a and 5b provided near the widthwise centers of the respective sheets 1a and 1b are transmitted via converters 15a and 15b, respectively. Tension meter 16a, 16
It is applied to b and the tension is displayed. Meanwhile, converter 1
The output signals of 5a and 15b are further added to the tension control panels 17a and 17b for the motors 3a and 3b as feedback signals, and the output signals from the tension control panels 17a and 17b adjust the rotational speeds of the motors 3a and 3b. The tension of each sheet is maintained at a predetermined value.

Although the sheet winding has been described in the above embodiment, it is needless to say that the present invention can be applied to winding a thinner film or the like.

[0029]

As described above, according to the present invention, the tension sensor for detecting the tension of the two sheets or the like is divided through one tension roll around which the divided sheets or the like are wound. Since they are arranged near the center of each sheet in the width direction, it is possible to improve the accuracy of detecting the tension of each of the left and right sheets. Therefore, it is possible to improve the accuracy of controlling the tension of each sheet and the like, and to obtain a good winding roll.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a tension control device of the present invention, in which (a) is a side view and (b) is a front view taken along the arrow of (a).

FIG. 2 is a trial calculation condition diagram in the first case, where (a) is a conventional diagram and (b) is a diagram corresponding to the present invention.

FIG. 3 is a trial calculation condition diagram in the second case, where (a) is a conventional diagram and (b) is a diagram corresponding to the present invention.

FIG. 4 is a trial calculation condition diagram in the third case, where (a) is a conventional diagram and (b) is a diagram corresponding to the present invention.

FIG. 5 is a diagram showing a detection accuracy trial calculation result.

FIG. 6 is a diagram showing detection accuracy trial calculation results under other conditions.

FIG. 7 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 8 is a diagram showing a detection accuracy test result under other conditions.

FIG. 9 is a diagram showing a detection accuracy trial calculation result under still other conditions.

FIG. 10 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 11 is a diagram showing detection accuracy trial calculation results under other conditions.

FIG. 12 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 13 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 14 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 15 is a diagram showing a detection accuracy trial calculation result under other conditions.

FIG. 16 is a conceptual diagram of a tension control device according to the present invention.

17 (a), (b), (c), and (d) are conceptual views of a wound state of a molded sheet, respectively.

FIG. 18 is a conceptual diagram of a winding state of two divided sheets.

19 (a), (b) and (c) are explanatory views of a conventional tension detecting means of two divided sheets.

[Explanation of symbols]

 1a, 1b Sheet 2 Tension roll 3a, 3b Motor 5a, 5b, 5c, 5d Tension sensor 6, 7, 8 Guide roll 15a, 15b Transducer 16a, 16b Tension meter 17a, 17b Tension control panel

Claims (2)

[Claims] 1. An in-line two-sheet winding machine that divides a strip-shaped body into two in the width direction in a line for molding and winding a strip-shaped body such as a plastic film or a sheet, and winds the divided strip-shaped bodies to the left and right respectively. In the tension control device, a tension sensor that detects the tension of the two strips via one tension roll around which the two strips are wound is provided near the center of the divided strips in the width direction. A tension control device for an in-line two-sheet winding and winding machine, which is characterized in that each is arranged. 2. A tension signal detected by a tension sensor corresponding to each strip is displayed and fed back as a tension control feedback signal to a winding motor for each divided strip. A tension control device for an in-line two-sheet winding and winding machine according to claim 1.