JPH07304547A - Belt-like sheet transferring roller and belt-like sheet tensile force measuring device and winding tensile force measuring device - Google Patents

Abstract

PURPOSE:To provide a belt like sheet transferring roller by which a belt-like sheet can be transferred without exerting adverse influence of frictional resistance in a bearing of a cylinder body by extending it over the outer periphery of the freely rotatable cylinder body. CONSTITUTION:In a belt-like sheet transferring roller R to transfer a belt-like sheet S by extending it over the outer periphery of a freely rotatable cylinder body 1, only one bearing 4b among bearings 4a and 4b supporting the cylinder body 1 at its both ends is driven in rotation by a driving means 7 at rotating speed faster than rotating speed of the cylinder body 1 to rotate by being driven by the traveling belt-like sheet S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-like sheet transfer roller for transferring a belt-like sheet such as a plastic film or paper by hanging it on the outer circumference of a freely rotatable cylinder, and a belt-like sheet using the belt-like sheet transfer roller. TECHNICAL FIELD The present invention relates to a belt-shaped sheet tension measuring device and a winding tension measuring device for measuring the tension of a sheet.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned belt-shaped sheet transfer roller, a cylindrical body for supporting and transferring the belt-shaped sheet has its both ends rotatably supported by bearings, and is rotated by being driven by the traveling belt-shaped sheet. To do.

Further, in the conventional belt-shaped sheet transfer roller,
In order to eliminate the rotational resistance of the roller that hangs the belt-shaped sheet, there is also a cylinder that adopts a tendency drive system. In this cylindrical body, the inner rings of the bearings that support both ends of the cylindrical body are fitted to the outer circumference of a common shaft, and this common shaft is supported by another bearing, and the common shaft is rotationally driven by a drive mechanism. To do. As a result, the rotational force due to the friction moment between the inner ring and the outer ring of each bearing that supports the cylindrical body at both ends is transmitted to the cylindrical body.

Further, the belt-like sheet transfer roller for tension measurement in the above-mentioned belt-like sheet tension measuring device has a cylindrical body,
Both ends thereof are simply rotatably supported by bearings so as to be rotated by the running belt-like sheet. Then, a load proportional to the tension is received from the running belt-shaped sheet. Therefore, the belt-shaped sheet tension measuring device converts the load applied to the cylindrical body into a belt-shaped sheet tension measurement signal according to its size, for example, by a load detector (load cell) provided at the bearing supporting portions at both ends of the cylindrical body. To measure.

[0005]

In the belt-shaped sheet transfer roller provided with the above-described freely rotatable cylindrical body whose both ends are simply rotatably supported by the bearing, the braking force caused by the friction moment of the bearing acts on the cylindrical body. .

Further, in the belt-shaped sheet transfer roller provided with the above-mentioned tendencies driving type cylindrical body, the bearing is driven so that the rotational speeds of the bearings for supporting the cylindrical body at both ends and the traveling speed of the belt-shaped sheet are exactly the same. Unless otherwise, a relative rotational speed is generated between the inner ring and the outer ring of the bearing, and a rotational force corresponding to the sum of friction moments of the bearings on both sides is generated in the cylindrical body. In practice, it is extremely difficult to drive the bearing so that the rotational speeds of the bearing that supports the cylindrical body at both ends and the traveling speed of the belt-shaped sheet are exactly the same, due to machining error, control error, etc. is there. That is, it can be said that it is practically impossible to reduce the rotational force due to the friction moment of both bearings to zero in the above-mentioned tendency drive type cylindrical body.

Therefore, strictly speaking, in the conventional belt-shaped sheet transfer roller, a braking force or a rotational force due to the friction moment of the bearing is generated in the cylindrical body, and the braking force or the rotational force causes an extra tension in the belt-shaped sheet. Or, it may cause a slip between the cylindrical body and the belt-shaped sheet. Since the braking force and the rotating force are usually small, when a thick belt-shaped sheet is transported with a relatively high tension, its adverse effect is hard to be realized and is conventionally ignored.

However, in recent years, very thin strip-shaped sheets such as plastic films have been manufactured. Since the belt-shaped sheet having a small thickness easily causes permanent strain, it is necessary to drive the belt-shaped sheet with a low tension in the traveling path. However, the belt-shaped sheet running at a low tension has a small frictional force with respect to the outer peripheral surface of the cylindrical body and is likely to slip. Further, the thin strip-shaped sheet is likely to be adversely affected by the braking force due to the friction moment of the bearing and the small tension due to the rotational force. Therefore, when an ultra-thin band-shaped sheet is guided and transferred using a conventional band-shaped sheet transfer roller, the band-shaped sheet and the cylindrical body slip and cause scratches on the band-shaped sheet, or the tension of the band-shaped sheet fluctuates and the band-shaped sheet changes. There is a problem that the sheet is wrinkled or permanently deformed.

Further, in the winding device for winding the strip-shaped sheet by driving the winding core as a center, when the tension of the strip-shaped sheet wound around the winding core, that is, the winding tension is too large, the central portion of the winding roll is When the thin strip-shaped sheet is wound, it is necessary to reduce the winding tension as much as possible within the range where the winding roll does not collapse. Further, when the strip-shaped sheet is divided into a plurality of strips and wound up, the width of each strip-shaped sheet becomes narrower, so that the winding tension must be maintained at a still smaller value. For example, the proper winding tension of a plastic film having a thickness of 20 microns or less is often 5 kg or less per 1 m width. Moreover, in order to obtain a high-quality take-up roll with proper winding hardness and no unevenness of the end surface, the take-up tension must be accurately controlled according to the set value based on an appropriate take-up tension pattern from the start of winding to the end of winding. I have to do it. For that purpose, feedback control of the winding tension is required, and it is necessary to accurately measure the winding tension. When the winding tension is measured using a tension-measuring transfer roller, if an extra rotational force or braking force other than the rotational force or braking force applied from the belt-shaped sheet is generated in the cylindrical body, it is caused by that. In order to accurately measure the winding tension, it is desirable that no excessive rotational force or braking force be applied to the cylindrical body because a measurement error will occur.

However, in the conventional belt-shaped sheet tension measuring device, the cylindrical body of the transfer roller for measuring the tension is supported only by the bearings at both ends and is simply rotatable. This causes a problem that a braking force is generated and a measurement error occurs.

Moreover, since this braking force changes according to the rotational speed of the cylindrical body, when measuring the tension of the strip-shaped sheet in the strip-shaped sheet traveling path in which the traveling speed varies variously,
It is extremely difficult to reliably compensate the measured signal. And the smaller the required winding tension is,
The adverse effect of the belt-shaped sheet tension measurement error becomes large.

Further, in the conventional winding tension measuring device using the belt-shaped sheet transfer roller, an accurate measured value cannot be obtained,
Therefore, the winding tension control becomes inaccurate, and especially when winding a thin strip-shaped sheet, the strip-shaped sheet is run under a low tension, so the measurement error of the tension greatly affects the winding tension control. However, there is a problem that a high quality winding roll cannot be obtained.

Therefore, according to the present invention, the belt-shaped sheet can be transferred so that the belt-shaped sheet is hung on the outer circumference of the freely rotatable cylinder and the frictional resistance of the bearing of the cylinder is not adversely affected. The purpose is to provide a roller.

It is another object of the present invention to provide a belt-shaped sheet tension measuring device capable of accurately measuring the belt-shaped sheet tension even under a low tension.

Another object of the present invention is to provide a winding tension measuring device suitable for high quality winding of an ultrathin strip-shaped sheet in the winding device.

[0016]

In order to achieve the above object, a belt-shaped sheet transfer roller according to the present invention is a belt-shaped sheet transfer roller for hanging a belt-shaped sheet around an outer circumference of a freely rotatable cylinder and transferring the roller. It is characterized in that only one of the bearings supporting both ends of the body is rotationally driven by the drive means at a rotational speed higher than the rotational speed of the cylindrical body that is driven and rotated by the running belt-shaped sheet.

In order to avoid complicating the mechanism of the driving means in the above belt-shaped sheet transfer roller, the bearings supporting both ends of the cylindrical body are bearings that generate substantially the same friction moment at the same rotation speed, It is desirable that one of the bearings supporting both ends of the cylindrical body be rotationally driven by the drive means at a speed that is approximately twice the rotational speed of the driven roller.

Further, it is convenient that the drive means is a motor attached to a member that rotatably holds the shaft that supports the one bearing.

Further, the belt-shaped sheet tension measuring device of the present invention measures the tension of the belt-shaped sheet using the belt-shaped sheet transfer roller of the present invention described above.

Further, the winding tension measuring device of the present invention is a winding device for winding the belt-like sheet by driving the winding core as a center, and using the belt-like sheet transfer roller of the present invention described above, the winding tension of the belt-like sheet. To measure.

The term "bearing ...
`` Rotationally driven '' means that the bearing rotationally drives either the inner ring or the outer ring in the case of a rolling bearing, and rotates the shaft or bearing metal in the case of a sliding bearing. It means driving.

[0022]

When only one of the bearings supporting both ends of the cylindrical body is rotationally driven by the drive means at a rotational speed higher than the rotational speed of the cylindrical body driven by the traveling belt-like sheet, the friction of the one bearing is caused. Since the rotational force resulting from the moment can be applied to the cylindrical body, it becomes possible to cancel the braking force due to the friction moment of the other bearing.

In the case where one of the bearings supporting the cylindrical body at both ends is driven to rotate at a speed twice as high as the rotational speed of the cylindrical body driven by the traveling belt-like sheet, the rotational speed of the cylindrical body and both bearings Considering the relationship with the rotational speed of the cylinder based on the cylindrical body, one of the bearings that is rotationally driven rotates faster than the cylindrical body by a speed equal to the rotational speed of the cylindrical body. Then, the rotational force corresponding to the friction moment of the bearing is transmitted from the bearing to the cylindrical body.

The other non-rotating bearing is
The cylinder body is rotating in a direction opposite to the rotation direction of the cylinder body by a speed equal to the rotation speed of the cylinder body, and a braking force corresponding to the friction moment of this bearing is applied to the cylinder body.

Therefore, if both ends of the cylindrical body are supported by bearings so that the respective friction moments are equal, the rotational force due to the friction moment of one of the rotationally driven bearings and the rotational force of the other one are rotating. The braking force due to the friction moment of the non-bearing cancels each other out.

Moreover, even if the rotational speed of the cylindrical body is variously changed, the relationship between the rotational speed of the cylindrical body and the rotational speeds of the both bearings does not change. Therefore, according to the change of the rotational speed of the cylindrical body, The rotational speeds of both bearings based on the cylindrical body increase or decrease by the same amount, and the rotational force and the braking force due to the friction moment of both bearings always cancel each other out.

Therefore, the cylindrical body of the belt-shaped sheet transfer roller can rotate without any frictional resistance of the bearing regardless of the traveling speed of the belt-shaped sheet. Also,
When this belt-shaped sheet transfer roller is used to measure the tension of the belt-shaped sheet, accurate tension can be measured even under low tension by eliminating the measurement error caused by the frictional resistance of the bearing.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the belt-like sheet transfer roller of the present invention will be described with reference to FIG.
A strip-shaped sheet S traveling in the vertical direction of FIG. 1 is hooked around the outer periphery of a cylindrical body 1 provided on the traveling route and guided. The belt-shaped sheet S is a driven roller Rd that is rotationally driven by a motor M.
Driving power is given from.

The cylindrical body 1 is provided with a shaft 2 and a shaft 3 protruding from both ends thereof. The shaft 2 and the shaft 3 are of the type and size so that the same friction moment is generated under the same rotational speed. Rolling bearings 4a, 4b having the same size
However, the inner ring is fitted and attached to the outer circumferences of the shafts 2 and 3. The outer races of the bearings 4a and 4b are put and fixed in housings provided at both ends of the cylindrical body 1. Also,
The shaft 3 is rotatably held by a holding member 6 having a bearing 5, and the shaft 2 is fixed to the holding member 6. And
These holding members 6 are provided on a frame (not shown).

Further, the belt-shaped sheet transfer roller R includes the bearing 3
It is provided with a drive means 7 for rotationally driving the inner ring of the.
The driving means 7 is composed of a pulley 7a provided on the rotary shaft Rs at the end of the driven roller Rd, a pulley 7b provided on the shaft 3, and a belt 7c wound around the pulleys 7a and 7b. The outer diameters of the pulleys 7a and 7b are determined so that the peripheral speed of the cylindrical body 1 is twice the peripheral speed of the driven roller Rd when the shaft 3 is assumed to be fixed to the cylindrical body 1. There is.

Therefore, the cylindrical body 1 includes the left and right bearings 4
Both ends are rotatably supported by a and 4b, and the inner ring of the right bearing 4b is rotationally driven by the driving means 7 at a speed twice as high as the rotational speed of the cylindrical body 1.

An embodiment of the belt-shaped sheet tension measuring device of the present invention will be described with reference to FIG. The belt-shaped sheet tension measuring device uses a belt-shaped sheet transfer roller R including a cylindrical body 1, a shaft 2 and a shaft 3 similar to those of the embodiment shown in FIG. 1 in order to measure the tension of the belt-shaped sheet S in the traveling path. . The shaft 3 is rotatably supported by a holding member 6 by a bearing 5, and rotation of an output shaft of an AC servomotor 7 attached to the holding member 6 is transmitted via a transmission device 8. Therefore, the cylindrical body 1 is rotatably supported at both ends by the left and right bearings 4 a and 4 b, and the inner ring of the right bearing 4 b can be rotationally driven by the AC servomotor 7.
On the other hand, the shaft 2 is fixedly held by the holding member 6, and the inner ring of the left bearing 4a does not rotate.

A load corresponding to the tension of the running belt-shaped sheet S is applied to the cylindrical body 1, and this load acts on the load detector 9 from the holding member 6 and is measured by the load detector 9. ing. Then, the load detector 9 converts the measured load into an electric signal corresponding to the magnitude of the measured load, and the amplification unit 1
0, the amplifying section 10 amplifies the electric signal and outputs it as a belt-shaped sheet tension detection signal.

The AC servomotor 7 is supplied with electric power from the inverter 11, and at the speed commanded by the speed control device 12 to the inverter, the AC servomotor 7 rotates in the same direction as the rotation direction of the cylindrical body 1 by the shaft 3.
Is driven to rotate, and the speed control device 12 causes the speed detection device 13 to
The inverter 11 is instructed to rotate at a speed twice as high as the rotational speed of the cylinder 1 detected momentarily. Therefore, the strip sheet S
During traveling, the inner ring of the bearing 4b is always rotationally driven by the AC servomotor 7 at a speed twice the rotational speed of the cylindrical body 1. Further, since the AC servomotor 7 is attached to the holding member 6, when the rotational force of the AC servomotor 7 is transmitted to the inner ring of the bearing 3, the influence of the reaction of the rotational force on the load detector 9 can be ignored. .

The speed detecting device 13 is provided with objects to be detected or detection marks at equal intervals in the circumferential direction of the turntable 1a which rotates together with the cylindrical body 1, and detects these without contact by a proximity switch or a photoelectric switch. The rotation speed of the cylindrical body 1 is detected by changing to a pulse signal and counting this pulse signal at every minute setting time. It should be noted that any means for detecting the rotation speed may be used as long as it can be detected so as not to give a rotation resistance to the tension measuring cylinder 1.

FIG. 3 is a schematic side view for explaining an embodiment of a sheet dividing and winding device to which the winding tension measuring device of the present invention is applied. The sheet dividing and winding device is configured to use a wide strip S0. A slitter 15 is supplied through a guide roller 14, and the slitter 15 divides the strip-shaped sheet S into a plurality of strip-shaped sheets S. The strip-shaped sheet S is transferred from a slit roller 16 to winding positions on both sides of the strip-shaped sheet S for individual tension measurement. , The take-up motor 18 through the touch roller 17
A winding roll 20 is manufactured by winding around a winding core 19 which is driven and rotated by the center.

The core 19, which is driven and rotated at the center, draws the strip-shaped sheet S fed from the slit roll 16 to the winding position and winds it around the winding roll 20. At this time, a tension equal to a quotient obtained by dividing the torque of the winding core 19 by the radius of the winding roll, that is, a winding tension is generated on the belt-shaped sheet S. Therefore, the winding tension can be measured by measuring the load applied to the cylindrical body 1 of the belt-shaped sheet transfer roller R provided on the traveling path of the belt-shaped sheet S. The cylindrical bodies 1 each have the same outer diameter, and are supported on a supporting device 23 provided on a movable base 22 that can be positioned in the width direction of the strip-shaped sheet S along the guide base 21, and the tension of the strip-shaped sheet S is It is arranged at a position where the strip sheet S can be guided so as not to affect the contact pressure between the touch roller 17 and the winding roll 5. The touch roller 17 is supported by a swing arm 24 provided on the movable base 22 so as to be rotated by being driven by the traveling belt-like sheet S. When the dividing width of the slitter 15 changes and the width of the strip-shaped sheet S to be wound changes, the strip-shaped sheet transfer roller R has a length corresponding to it.
And the touch roller 17 is replaced. Regarding such a sheet dividing and winding device, for example, Japanese Unexamined Patent Application Publication 1-2
The detailed description is omitted because it is described in detail in Japanese Patent No. 20664.

As shown in FIG. 4, the cylindrical body 1 in the transfer roller R for tension measurement has rolling bearings 4 at both ends.
a, 4b, and shafts 2 and 3 fitted to the inner rings of the bearings 4a, 4b. A bearing 25 is fitted around the outer periphery of the shaft 3, and the bearing 25 supports the tubular member 26. The AC servomotor 7 is attached to the end of the tubular member 26, and the output shaft of the AC servomotor 7 and the shaft 3 are connected on the same central axis line. Then, in order to be supported by the support device 23, the shaft 2 and the tubular member 26 are attached to the left and right holding members 6.

As shown in FIG. 5, the holding member 6 is attached to the arm 27 of the supporting device 23 via a leaf spring 28.
The leaf spring 28 can be moved in the vertical direction within the bending range. Further, it has an opening 6a for receiving the shaft 2 or the tubular member 26 provided in the cylindrical body 1 and a clamp device 29 composed of a fluid pressure cylinder, and the claw 29 of the clamp device 29 is provided.
By advancing and retracting a from the side wall of the opening 6a, the shaft 2 of the cylindrical body 1 or the tubular member 26 can be fixed and released in the opening 6a.

A load detector 9 is provided between the holding member 6 and the arm 27.
Is provided. The load detector 9 has a holding member 6 at the upper end.
In addition, the lower end portion is fixed to the arm 27 by a pin, and the load applied to the cylindrical body 1 in the vertical direction by the tension of the belt-shaped sheet S is
It is measured as the winding tension of the belt-shaped sheet S.

FIG. 6 is an explanatory view of the winding tension control system of the sheet split winding device, in which the winding tension control device 30 sets the required winding tension setting signal and the amplification of the winding tension measuring device. The take-up tension measurement signal fed back from the circuit 10 is compared, and the take-up motor 1 is adjusted so that the deviation becomes zero.
By feeding a control signal to the winding motor 8 and adjusting the drive torque output from the winding motor 18 to the winding core 19, feedback control of the winding tension is performed.

The AC servomotor 7 is constantly driven so that the shaft 3 and the inner ring of the bearing 4b can be rotationally driven at a speed twice as high as the rotational speed of the cylindrical body 1 that is rotated by the running belt-shaped sheet S. The speed is controlled by the controller 12 through the inverter 11. The speed control device 12 controls the output speed of the motor 31 that rotationally drives the slit roll 15 and the like in order to run the belt-shaped sheet S0 by the speed detection device 13 such as a known speed generator or pulse generator.
Of the belt-shaped sheet S is calculated based on the detected traveling speed of the belt-shaped sheet S, and the speed controller 12 individually sets the speed twice the rotational speed of the cylindrical body 1 as a target value. And outputs a speed command signal to the inverter 11. The traveling speed of the belt-shaped sheet S is equal to the product of the pi, the diameter of the cylindrical body 1, and the rotational speed of the cylindrical body 1. Therefore, based on this relationship, the traveling speed of the belt-shaped sheet S can be calculated based on the detected traveling speed of the belt-shaped sheet S. The rotation speed can be calculated. Therefore, in this embodiment, it is not necessary to individually detect the rotation speed of each cylindrical body 1.

Although the present invention has been described with reference to the preferred embodiments, its embodiments can be variously changed according to design conditions without changing the gist of the invention.

For example, the cylindrical body 1 of the belt-shaped sheet transfer roller R shown in FIG. 7 has a shaft 32 fixed to the left end instead of the shaft 2 shown in FIG.
The cylindrical member 33 is concentrically supported by the rolling bearing 4a. The tubular members 33 and 26 are held by the left and right holding members 6.

The cylindrical body 1 of the belt-shaped sheet transfer roller R shown in FIG. 8 has the shaft 34 fixed to the right end instead of the shaft 3 shown in FIG. 7, and the rolling bearing 4b is fitted on the outer periphery of the shaft 34, , The outer ring of the rolling bearing 4b to the large diameter portion 35 of the shaft 35.
It is fitted and fitted in the housing formed in a. The shaft 35 is rotatably supported by a cylindrical member 26 having the AC servomotor 7 attached to an end thereof by a bearing 25 fitted on the outer circumference, and the output shaft of the AC servomotor 7 and the shaft 3 are supported.
8 is connected. The tubular member 26 is fixed to the holding member, and the AC servomotor 7 rotationally drives the outer ring of the rolling bearing 4b.

Further, the shaft 32 on the left side of the cylindrical body 1 shown in FIG.
Alternatively, the bearing 4a may be replaced with the shaft 2 and the bearing 4a on the left side of the cylindrical body 1 shown in FIG.

Further, in the sheet dividing and winding device shown in FIG. 3, a free rotating roller common to each strip-shaped sheet is provided in place of the strip-shaped sheet transfer roller R provided immediately before the touch roller 17, and instead of the touch roller 17, For example, a belt-shaped sheet transfer roller R of the present invention shown in FIG. 4 may be provided. In that case, the arm 27 of the support device 23 shown in FIG. 4 is used as the swing arm 24 shown in FIG. Then, the common guide roller guides the strip-shaped sheet to the cylindrical body so that the line of action of the load vector due to the tension of the strip-shaped sheet applied to the outer periphery of the cylindrical body passes through the center of swinging of the swinging arm, and is wound up. Make sure that the tension does not affect the contact pressure between the take-up roll and the cylinder. Then, the load applied to the cylindrical body can be measured by the load detector provided between the holding member holding the cylindrical body and the arm. Furthermore, for example, Japanese Patent Laid-Open No. 2-13
As disclosed in Japanese Patent No. 8064, the swing arm is provided with a measuring means for measuring a tilt angle of the cylindrical body from a reference position, and a winding motor is based on a measurement signal from the tilt angle measuring means. It is advisable to be able to adjust the drive torque of the.

Further, the winding tension measuring device can be applied not only to the sheet dividing winding device but also to a winding device having no slitter. Further, the driving means for rotationally driving the bearing that supports both ends of the cylindrical body is not limited to the belt transmission device that transmits the rotation of the motor M shown in FIG. 1 to the shaft 3 or the AC servo motor shown in FIG. A known transmission device or motor may be used. Further, when the both ends of the cylindrical body are detachably supported by the chucks attached to the pair of support arms, the bearing that rotatably supports the chuck becomes the bearing that supports both ends of the cylindrical body.

The magnitude of the friction moment of the bearing is
Since it is proportional to the product of the bearing load and the bearing radius and the friction coefficient, when carrying out the present invention, the bearings that support the cylindrical body at both ends are of the same type and the same size in order to equalize the friction moments. Moreover, it is desirable to design so that the bearing load is even. However, depending on the design conditions,
When the radius of the bearing that supports the cylindrical body at both ends and the bearing load on both sides are different, the coefficient of friction tends to increase or decrease according to the magnitude of the relative rotational speed in the bearing. Adjust the rotation speed of the bearings so that the friction moment of the bearing that rotates at a higher rotation speed than the body rotation speed and the friction moment of the other non-rotating bearing are as equal as possible. May cancel each other. Therefore, when the present invention is carried out, strictly speaking, there is a case where one of the bearings does not rotate at a rotation speed that is exactly twice the rotation speed of the cylindrical body. And even if such a device does not cause any trouble, it is considered to belong to the technical scope of the present invention.

Furthermore, both of the bearings that support the cylindrical body at both ends may be individually driven to rotate. In that case, one bearing is driven at a speed higher than the rotation speed of the cylindrical body, and the other bearing is driven at a speed lower than the rotation speed of the cylindrical body. Then, the one bearing is rotationally driven at a rotational speed obtained by subtracting the rotational drive speed of the other bearing from the rotational speed twice the rotational speed of the cylindrical body. By doing so, the braking force and the rotational force cancel each other, as in the case where only one bearing is rotationally driven. Therefore, also in this case, it is considered to belong to the technical scope of the present invention.

[0051]

According to the belt-like sheet transfer roller of the present invention, by rotating only one of the bearings supporting both ends of the cylindrical body at a speed higher than that of the cylindrical body,
Since the rotational force due to the friction moment of one bearing is applied to the cylindrical body and the braking force of the cylindrical body due to the friction moment of the other non-rotating bearing is canceled out, the cylindrical body is always substantially It can rotate without frictional resistance of the bearing. Therefore, the cylindrical body can rotate following the running belt-shaped sheet even when the tension of the belt-shaped sheet is small, and the friction moment of the bearing adversely affects the tension of the belt-shaped sheet, or the tension between the belt-shaped sheet and the belt-shaped sheet. The strip-shaped sheet can be guided without causing scratches on the strip-shaped sheet due to slip. Therefore, it is possible to provide the optimum belt-shaped sheet transfer roller for the traveling path of the ultra-thin belt-shaped sheet.

Further, according to the belt-shaped sheet tension measuring apparatus of the present invention, it is possible to avoid the frictional resistance of the bearing of the cylindrical body from affecting the measured value of tension as in the conventional case, and the belt-shaped sheet tension measuring apparatus can be used even under a low tension. The seat tension can be measured extremely accurately.

Further, according to the winding tension measuring device of the present invention, the winding tension can be accurately measured even when the winding tension is small, so that even when winding an extremely thin strip-shaped sheet,
It is possible to accurately control the winding tension under a low tension and obtain a high-quality winding roll. In particular, in the sheet dividing and winding device, the width of the divided strip-shaped sheet is narrow and the required winding tension is very small. However, according to the present invention, the winding tension for each divided strip-shaped sheet can be accurately measured. It is possible to measure, and it is possible to significantly improve the productivity of the winding roll for the ultra-thin band-shaped sheet.

[Brief description of drawings]

FIG. 1 is an explanatory diagram according to an embodiment of a belt-shaped sheet transfer roller of the present invention.

FIG. 2 is an explanatory diagram according to an embodiment of the belt-shaped sheet tension measuring device of the present invention.

FIG. 3 is a schematic side view for explaining a sheet split winding device to which an embodiment of the winding tension measuring device of the present invention is applied.

FIG. 4 is a front view of the belt-shaped sheet transfer roller shown in FIG. 3, a part of which is shown in section.

5 is a side view of a supporting device for supporting the belt-shaped sheet transfer roller shown in FIG.

FIG. 6 is an explanatory diagram of a winding tension control system in the sheet split winding device shown in FIG.

FIG. 7 is an explanatory diagram of another embodiment of the belt-shaped sheet transfer roller.

FIG. 8 is an explanatory diagram of still another embodiment of the belt-shaped sheet transfer roller.

[Explanation of symbols]

 R band-shaped sheet transfer roller S band-shaped sheet 1 cylindrical body 2 axis 3 axis 4a bearing 4b bearing 5 bearing 6 holding member 7 drive means, motor 9 load detector 15 slitter 18 winding motor 19 winding core 20 winding roll 23 support device 30 Winding tension controller

Claims (5)

[Claims] 1. A belt-shaped sheet transfer roller for transporting a belt-shaped sheet by hanging it around an outer circumference of a freely rotatable cylinder, wherein only one of the bearings supporting both ends of the cylinder is running. A belt-shaped sheet transfer roller which is rotationally driven by a drive means at a rotational speed higher than the rotational speed of the cylindrical body which is driven to rotate. 2. The bearings that support the cylindrical body at both ends are bearings that generate substantially the same friction moment at the same rotational speed, and one of the bearings that supports the cylindrical body at both ends is the bearing of the cylindrical body. 2. The belt-like sheet transfer roller according to claim 1, which is rotationally driven by the drive means at a speed which is about twice the rotational speed. 3. The belt-shaped sheet transfer roller according to claim 1, wherein the drive means is a motor attached to a member that rotatably holds a shaft that supports the one bearing. 4. The method according to claim 1, claim 2 or claim 3.
A belt-shaped sheet tension measuring device for measuring the tension of the belt-shaped sheet by using the belt-shaped sheet transfer roller described. 5. A winding device for winding a belt-shaped sheet by driving a winding core as a center, and measuring the winding tension of the belt-shaped sheet by using the belt-shaped sheet transfer roller according to claim 1, 2 or 3. Take-up tension measuring device.