JPH0466783B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a roller device having a single or plural rollers for feeding a continuous strip of paper, synthetic resin film, metal foil, etc. It is related to.

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 will be used to feed the strip. 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 adhered 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 aluminum foil roughening treatment equipment and chemical conversion treatment equipment 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. However, even if such measures are taken, the aluminum foil may break or
It was not possible to reliably prevent discontinuous running, vibration, etc.

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]

The roller device of the present invention will be described with reference to FIG. A plurality of convex portions 2 each having a straight or curved front ridge line 3 facing left and right from the center in the axial direction and tilting in the counter-rotation direction are arranged at unequal intervals in the circumferential direction so as to apply an expanding force in the direction. It is equipped with a formed roller.

Further, either or both of the width and the spacing of the convex portions 2 can be made different. Further, a roller device may be formed by combining a roller in which the convex portions 2 are formed at irregular intervals with another roller.

[Effect]

The central part of the convex part 2, which has a front ridge line that is symmetrical with respect to the center, applies a component force only in the feeding direction to the strip, and the parts facing left and right from the center apply force to the strip. Since an outward force is applied to the belt, the belt can be fed without wrinkles or meandering. Furthermore, by forming the convex portions 2 at irregular intervals in the circumferential direction, the period of change in the tension applied to the strip is not constant, so the possibility of resonance of mechanical vibration occurring is extremely small, and the Then,
It is possible to reduce the occurrence of vibration and prevent the strip from breaking.

〔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 1 is an outer circumferential portion, 2 is a convex portion, 3 is a front ridgeline, and 4 is a shaft. Although only four convex portions 2 formed on the outer circumferential portion 1 are shown in the figure for the sake of simplification, in reality, a plurality of convex portions 2 are formed at intervals over the entire circumference of the outer circumferential portion 1 of the roller. At least some of them are formed at irregular intervals. Further, by rotating the shaft 4 in the direction of the arrow by a motor or the like, a belt-shaped body (not shown) is fed into contact with the convex portion 2.

In this embodiment, the convex portion 2 is symmetrical with respect to the axial center of the outer peripheral portion 1 of the roller, and is designed to apply a force to spread the fed strip in the width direction. 2 shows a case where the front ridge line 3 is a straight line that extends left and right from the center in the axial direction and is inclined in the counter-rotation direction, but it can also be a curved line that is symmetrical with respect to the center of the outer peripheral portion 1. With such a convex portion 2, it is possible to feed the strip without wrinkles or meandering. In particular, when the front ridge line 3 of the convex portion 2 is a quadratic curve such as a symmetrical circular arc, hyperbola, or parabola, it is possible to generate component forces in the direction of both side edges of the fed strip. This makes it possible to reliably prevent wrinkles from forming and prevent meandering.

In Figure 2, the outer diameter of the roller is D, and the convex portion 2
The number of ridges is N, the width of the convex portion 2 is W, the width between the front ridges 3 is α (center angle), the width of the trough is θ (center angle), and the roller is rotated in the direction of the arrow at a constant angular speed ω. In _the case _where ) becomes. 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 of the paper is located in the valley between the convex portions 2, it is fed at a speed corresponding to the velocity Vmin of the valley. Therefore, the feeding speed of the strip 5 in the direction of the arrow changes.

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 speed change ratio Vmin/V ₀ is expressed 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, when the convex portions 2 are formed at regular intervals,
The rollers with N=12, W=8mm, and D=115mm are:
Since θ≈22°, the ratio of speed changes is approximately 0.98 from equation (3), but the ratio of acceleration/deceleration changes 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 approximately 20%.

The convex portion 2 is designed so that it can be easily designed and manufactured.
Normally, the width W and the width θ of the valley are generally constant. Therefore, in FIG. 2, the change in tension applied to the strip 5 wound at 180° occurs simultaneously and at a constant period for the upper and lower strips 5, and the convex portion 2 The force applied to the roller is maximum when the roller is positioned at . In addition, 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 may become in a resonant state and break. be. Also, the vibration of the roller device increases.

In addition, the above-mentioned change in tension on a single roller can be absorbed by the roller drive system, or by the sliding between the roller and the strip, or by the stretching of the strip. However, if multiple rollers are provided, and the period and phase of the tension changes described above are almost the same, the changes in tension applied to the strip by each roller will be synchronized. In some cases, the band-shaped body may be broken.

However, in the present invention, the convex portions 2 are formed at irregular intervals, and the tension changes no longer at a constant period, so that it is possible to avoid the band-like body 5 from being in a resonant state. Therefore, vibration can be suppressed and breakage of the strip 5 can be prevented.

Such convex portions 2 can be easily spaced at unequal intervals by varying either or both of the width W or the width θ of the valley portion. In addition,
It is desirable to select the formation position, width W, etc. of the convex portion 2 so as to obtain a rotational balance of the roller. Further, the number of convex portions 2 may be an even number or an odd number, but when the number is an odd number, resonance phenomena can be suppressed when used in combination with other rollers. Further, even if the width W of the convex portion 2 is varied while keeping the interval α between the front ridge lines 3 constant, the resonance state described above can be avoided. Also, the width W of the convex portion 2
It is also possible to set it to zero. In this case, the roller has a polygonal shape with each side having a different length, and each ridgeline is a straight line or curved line symmetrical with respect to the center, similar to the front ridgeline 3 described above.

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,
Showing a roller device having a plurality of rollers, 11-
Reference numeral 13 denotes a driving roller, and 14 and 15 denote driven rollers. A belt-shaped body 16 is wrapped around these rollers 11 to 15, and is fed by the driving rollers 11 to 13 rotating in the direction of the arrow. At least one of these rollers is a roller having convex portions 2 formed at irregular intervals as shown in FIG. 1 or 2.

In a roller device having a plurality of rollers like this, when using rollers that all have the same outer diameter and convex portions at regular intervals, if manufacturing errors are ignored, the change in tension applied to each strip is The periods will be the same, and the phases will match with a certain probability. When the phases of such tension changes match, an overall resonant state is created, the vibration becomes large, and the strip is broken.

In order to avoid such a phenomenon, it is possible to make the outer diameters of the rollers different, but this makes designing, manufacturing, and maintenance difficult. Therefore, even if rollers with the same outer diameter are used, by using a roller with unevenly spaced convex portions 2 as described above,
Global resonance conditions can be avoided. Also, by varying the number of convex portions 2,
Furthermore, a resonance state can be avoided more reliably. In this case, it is preferable to select an odd number of convex portions 2 and 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 degrees with respect to the center, and 12 convex parts 2 with a height of 4 mm and a width of 8 mm are formed at regular intervals. When roller (a) is used, only the conditions of this roller and the convex part 2 are different, and the convex part 2 is
Three types of rollers (b), (c), and (d) whose widths were changed to 7, 8, and 9 mm to make them unevenly spaced, and the number of convex portions 2 were 12, 13, and 15. In the case of singly or in combination, the thickness of the strip is 20 μm,
A feeding test was conducted on aluminum foil with a width of 500 mm at various speeds under constant tension.

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

〔Effect of the invention〕

As explained above, the present invention is a roller device consisting of a single roller or a plurality of rollers,
A plurality of convex portions 2 having straight or curved front ridge lines symmetrical with respect to the center of the outer circumferential portion 1 of the roller are formed at irregular intervals, and the convex portions 2 allow the belt-shaped body to be It is possible to feed the material without wrinkles or meandering, and further, by making the convex portions 2 unevenly spaced, it is possible to avoid the resonance phenomenon, thereby suppressing the occurrence of vibration. However, breakage of the strip can be prevented.

In the case of a roller device with multiple rollers,
By using rollers with different numbers of convex portions 2, it is possible to shift the phase of the change in tension applied to the strip by each roller and to make the period different, so that resonance phenomena can be reliably avoided.

Therefore, it has the advantage of being able to stably feed even strips that are extremely thin and have low mechanical strength, improving the quality of products using these strips, and making it easier to manufacture by breaking. Since there is no interruption of the process, costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of one embodiment of the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the present invention. 1 is an outer circumference, 2 is a convex portion, 3 is a front ridgeline, and 4 is an axis.

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 plurality of convex portions 2 each having a straight or curved front ridgeline 3 extending left and right from the center in the axial direction and tilting in a counter-rotation direction so as to apply a force to spread the conveyed belt-shaped body in the width direction.
A roller device comprising: rollers formed at irregular intervals in the circumferential direction. 2. The roller device according to claim 1, wherein the plurality of convex portions 2 have different widths. 3. The roller device according to claim 1, wherein the widths of the troughs between the plurality of convex portions 2 are made different. 4. The roller device according to claim 1, wherein the number of the convex portions 2 is an odd number. 5. The roller device according to claim 1, wherein the plurality of rollers have different numbers of the convex portions 2.