JPH0464981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a roller device for feeding a continuously supplied strip of paper, synthetic resin film, metal foil, or the like.

In devices that continuously feed a strip of paper, synthetic resin film, metal foil, etc. and cut it into predetermined lengths or wind it to a predetermined diameter, rollers are used to cut the strip into a predetermined diameter. will be sent. Further, in surface roughening processing equipment, chemical conversion processing equipment, etc. for aluminum foil for aluminum electrolytic capacitors, a roller device having a single or plural rollers is used to feed the aluminum foil. When feeding such a strip, it is desired to prevent the strip from being wrinkled or broken, meandering or vibrating.

[Conventional technology]

The rollers for feeding the above-mentioned strips are generally cylindrical and made of metal or synthetic resin. When using such rollers, be careful not to apply large tension to the strip and cause wrinkles on the strip.
It also prevents meandering from occurring.

Also known is a configuration in which an elastic body such as rubber or sponge is attached to the outer peripheral surface of the roller to prevent excessive stress from being applied to the strip. Also known is a configuration in which linear unevenness is formed on the outer circumferential surface of the roller to reduce the contact area with the strip, thereby reducing the chance of wrinkles occurring.

[Problem that the invention seeks to solve]

When feeding a strip, wrinkles, meandering, breakage, and discontinuous running of the strip may be a problem, as well as vibration. In order to solve these problems, it is possible to form a plurality of convex parts on the outer periphery of the roller at equal intervals in the circumferential direction, adjust the tension and running speed applied to the strip, and improve the mechanical strength. Measures to increase this have been proposed. Among these, a great effect was obtained in preventing wrinkles and meandering when a plurality of convex portions symmetrical with respect to the center were formed on the outer peripheral portion of the roller. However, the desired effects were not obtained regarding defects such as breakage, discontinuous running, and vibration.

In particular, in roughening treatment equipment and chemical conversion treatment equipment for aluminum foil for aluminum electrolytic capacitors, the thickness and strength of the aluminum foil have become increasingly strict conditions for the roller devices used to feed them. As a result, the occurrence of the above-mentioned problems has become more prominent.

Therefore, in order to control the feeding of the aluminum foil, we tried applying measures such as precisely adjusting the tension applied to the aluminum foil and finely adjusting the running speed, and smoothing the corners of the convex portion of the roller. Even if such measures were taken, breakage of the aluminum foil, discontinuous running, vibration, etc. could not be prevented.

An object of the present invention is to prevent the occurrence of breakage or discontinuous running of a strip in a roller device consisting of a single or plural rollers for feeding a strip, and to prevent the generation of vibration in the device. That is.

[Means for solving problems]

As explained with reference to FIG. 1, the roller device of the present invention has an outer circumferential portion 1 that is symmetrical with respect to the axial center of the outer circumferential portion 1 and has a width relative to the belt-like object to be fed. An odd number of 7 or more straight or curved convex portions 2 are formed at predetermined intervals in the circumferential direction so as to apply a force to expand in the direction of rotation. It is equipped with a roller.

Further, it is preferable that the number of the convex portions 2 is a prime number of seven or more, and it is also preferable that the number of the convex portions 2 of the plurality of rollers is different from each other.

[Effect]

A convex portion 2 that is symmetrical with respect to the center of the outer peripheral portion 1
The central part applies a component of force to the strip only in the feeding direction, and the parts facing left and right from the center apply component force to the outside of the strip, which prevents wrinkles from forming on the strip. The belt-shaped body can be fed without causing any meandering or meandering. Also, if the number of convex portions 2 is small, the change in tension applied to the strip will increase and the feeding will not be smooth, but if there are 7 or more convex portions, the equivalent outer peripheral surface will be a polygon close to a circle. , it is possible to reduce the change in the tension applied to the strip and to continuously feed the strip. Also, by making the number of convex portions 2 an odd number,
The possibility of resonance of mechanical vibrations occurring is extremely reduced, and therefore, vibration generation can be reduced and breakage of the strip can be prevented.

〔Example〕

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

FIG. 1 is a schematic perspective view of an embodiment of the present invention, in which seven or more convex portions 2 are formed on the outer peripheral portion 1 of a roller at predetermined intervals in the inner peripheral direction. This convex part 2
is symmetrical with respect to the axial center of the outer peripheral part 1 of the roller, and rotates as indicated by the arrow so as to apply a force to spread the fed strip (not shown) in the width direction. It has a straight front ridgeline 3 inclined in the opposite direction. And axis 4
By rotating the belt in the direction of the arrow by a motor or the like, a strip (not shown) is brought into contact with the convex portion 2 and fed.

In this embodiment, the convex portion 2 is symmetrical with respect to the center in the axial direction, and when it faces left and right from the center in the axial direction, that is, when it faces toward both ends of the roller,
Although a case is shown in which the front ridge line 3 is a straight line inclined in the counter-rotation direction, the front ridge line 3 can also be a curved line such as a circular arc, a hyperbola, or a parabola that is symmetrical about the center in the axial direction. With such a convex portion 2, it is possible to feed the strip without wrinkles or meandering. especially,
When the front ridge line 3 of the convex portion 2 is made into a quadratic curve such as a symmetrical arc, hyperbola, or parabola, it is possible to generate component forces in the direction of both side edges of the belt-shaped body to be fed. , it is possible to reliably prevent the occurrence of wrinkles and also prevent meandering.

In Figure 2, the outer diameter of the roller is D, and the convex portion 2
When the width of the valley in between is θ (center angle) and the roller is rotated at a constant angular velocity ω in the direction of the arrow, the speed V ₀ of the convex portion 2 is V ₀ = D/2・ω ……( 1), and the minimum velocity Vmin at the valley is Vmin=D/2・cosθ/2・ω (2). That is, in the state shown in FIG. 2, since the strip 5 is in contact with the convex part 2 at the upper part of the roller, it is fed at a speed corresponding to the speed _V0 of the convex part 2, and Since the lower part is located in the trough between the convex portions 2, it is fed at a speed corresponding to the speed Vmin of the trough. Therefore, the feeding speed of the strip 5 in the direction of the arrow changes at a constant cycle corresponding to the interval between the convex portions 2.

It is desirable that the tension applied to the fed strip 5 is constant, but due to being fed by the roller having the convex portion 2 as described above, a change in speed occurs, and due to the change in speed. Changes in acceleration/deceleration affect the strip 5 as changes in tension. That is, from equations (1) and (2), the ratio of speed change Vmin/V ₀ is as follows: Vmin/V ₀ =cosθ/2 (3). Therefore, the ratio A of changes in acceleration/deceleration can be obtained by differentiating equation (3) with respect to θ, so that A=−sinθ/2 (4).

For example, the convex portions 2 are formed at regular intervals, the number of convex portions 2 is N=12, the width W of the convex portions 2 is 8 mm, and the outer diameter D
= 115 mm, the width θ of the valley between the convex portions 2 is approximately 22°, so the ratio of speed change is approximately 0.98 from equation (3), but the ratio A of change in acceleration/deceleration is , which is approximately 0.19 from equation (4). That is, the change in tension of the strip 5 which is proportional to the ratio of change in acceleration/deceleration is about 20%.

Generally, an even number of convex portions 2 are formed to facilitate design and manufacture. Therefore, as shown in FIG. 2, the change in tension applied to the 180°-wound strip 5 occurs simultaneously and at regular intervals on the upper and lower strips 5, and the convex portion 2
The force applied to the roller is maximum when the rollers are positioned at the top and bottom. Also, if the period matches the natural frequency according to the length, elastic modulus, etc. of the band-shaped body 5, or if it matches the subharmonic resonance frequency, the band-shaped body 5 will be in a resonant state and break. There is. Also, the vibration of the roller device increases.

In addition, the above-mentioned change in tension on a single roller is absorbed by the roller drive system, or by the sliding between the roller and the strip, or by the elongation of the strip, but when multiple rollers are used, In a device equipped with the above-mentioned tension changes, if the period and phase are almost the same, the changes in tension applied to the strip by each roller may be added together, causing the strip to break. be.

However, in the present invention, an odd number of convex portions 2 are formed, and the phase of change in tension is opposite to that of the strip 5 shown in FIG. In comparison, the probability of a resonance state is reduced. Particularly when the roller is combined with another roller, the period of change in tension will be different, thereby suppressing the generation of vibration and preventing the strip 5 from breaking.

The number of convex portions 2 should be an odd number of 7 or more, and if the number is less than 7, the effect of preventing wrinkles and meandering will be reduced, although it depends on the outer diameter D of the roller. The change in tension applied to the strip 5 increases. Therefore, it is necessary that there are seven or more. In addition, when a roller device is constituted by a plurality of rollers, it is preferable that the number of convex portions 2 of each roller is a different prime number. As a result, the periods of changes in tension applied to the strip by each roller are all different, and the probability that the phases of the tension changes match is reduced, thereby preventing vibrations and breaking of the strip. can.

Further, the roller can be made of metal such as aluminum, but it can also be made of synthetic resin such as glass fiber reinforced vinyl ester resin.

FIG. 3 is an explanatory diagram of another embodiment of the present invention,
1 shows a roller device consisting of a plurality of rollers. In the figure, 11 to 14 are driving rollers, 15 to 17 are driven rollers, N1 to N7 are the numbers of convex portions of these rollers, and 18 is a strip.

For rollers with an odd number of 7 or more convex parts, at least one of rollers 11 to 17 is effective in preventing vibration and breakage, but if multiple rollers are arranged in an odd number as described above, Preferably, a convex portion is formed. Furthermore, if the number of convex portions is selected to be a prime number, vibration prevention and breakage prevention will be more effective. Further, the number of convex portions of the plurality of rollers can be an odd number, and the number of convex portions can be different from each other. In that case as well, it is preferable to select each as a prime number.

The rollers used in equipment for roughening and chemical conversion treatment of aluminum foil for aluminum electrolytic capacitors have an outer diameter of 75 mm to 160 mm and a length of 550 mm.
mm to about 600 mm, and a larger number of such rollers than the case shown in FIG. 3 are used to constitute a roller device for feeding aluminum foil.

As such roller, outer diameter 115mm, length 600
mm, the front ridge line 3 of the convex part 2 is a straight line inclined at ±8° with respect to the center, and 12 (even number) convex parts 2 with a height of 4 mm and a width of 8 mm are formed at regular intervals. When roller a made of ester resin is used,
In cases where two types of rollers b and c, which differ only in the conditions of the convex portions 2 from this roller and have the number of convex portions 2 of 13 and 15 (odd number), are used alone and in combination, As a strip, 20μm thick and 500mm wide
A feeding test was conducted on aluminum foil at various speeds under constant tension.

The presence or absence of defects such as vibration and breakage was visually confirmed. As a result, fewer problems occurred when only roller b was used than when only roller (a) was used. When used alone, roller b was the best, and stable feeding was possible in the order of a<c<b. Also, when rollers a to c are used in combination, a<(a+c)<(a+b)<(b+c)
<(a+b+c) stable feeding was possible.

FIG. 4 is a cross-sectional view of still another embodiment of the present invention, showing a roller having a polygonal cross section and a convex portion 2a in which the width W of the convex portion 2 is zero in the aforementioned embodiment. , the dotted line corresponds to the aforementioned outer periphery. Further, the line along the axial direction of the apex of the convex portion 2a corresponding to the front ridge line 3 is a straight line or curved line that is symmetrical with respect to the center of the roller, and the number of convex portions 2a is 7. The number shall be an odd number greater than or equal to . Also 4
a indicates the axis.

Even when a single roller having such a polygonal cross section is used, the same effect as in the above-mentioned embodiment can be obtained, and when a plurality of rollers are combined, the same effect as in the above-mentioned embodiment can be obtained. This is a combination of rollers having different numbers of convex portions 2a, and can be combined with the roller having the convex portions 2 having the width W of the above-mentioned embodiment.

As mentioned above, the present invention is applicable not only to a single roller but also to various combinations of a plurality of rollers.

〔Effect of the invention〕

As explained above, in the present invention, an odd number of seven or more straight or curved convex portions 2 are formed in a symmetrical shape with respect to the center of the outer peripheral portion 1 of the roller. Accordingly, it is possible to feed the belt-shaped body without wrinkles or meandering. Furthermore, by forming an odd number of seven or more convex portions 2, resonance phenomena can be avoided, thereby suppressing vibration generation and preventing breakage of the strip.

In addition, when a plurality of rollers are provided, by using rollers with different numbers of convex portions 2, the phase of the tension change applied to the strip by each roller is shifted,
Moreover, since the periods can be made different, resonance phenomena can be reliably avoided. especially,
By selecting the number of convex portions 2 to be a prime number, it is possible to more reliably avoid the resonance phenomenon, and it is possible to prevent the band from breaking.

Therefore, it has the advantage of being able to feed stably with a simple configuration even for strips that are extremely thin and have low mechanical strength, improving the quality of products using these strips. Moreover, since there is no interruption of the manufacturing process due to breakage, costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of one embodiment of the present invention, and FIG.
3 is an explanatory diagram of one embodiment of the invention, FIG. 3 is an explanatory diagram of another embodiment of the invention, and FIG. 4 is a sectional view of still another embodiment of the invention. 1 is the outer periphery, 2 and 2a are the convex parts, 3 is the front ridgeline,
4 and 4a are axes.

Claims (1)

[Scope of Claims] 1. In a roller device having a single roller or a plurality of rollers for feeding a strip, the outer peripheral portion 1 is provided with a roller that is symmetrical with respect to the center of the outer peripheral portion 1 in the axial direction. A straight or curved convex portion 2 is provided at a predetermined circumferential direction from the center in the axial direction to the left and right and inclined in the counter-rotation direction so as to apply a force to spread the belt-shaped body in the width direction. A roller device comprising an odd number of seven or more rollers formed at intervals. 2. The roller device according to claim 1, wherein the number of the convex portions 2 is a prime number of 7 or more. 3. The roller device according to claim 1, comprising a plurality of rollers each having a different number of convex portions 2.