JP5696609B2 - Transport device - Google Patents

Description

  The present invention relates to a transport apparatus having tension control means for applying a predetermined transport tension to a web-shaped transport object transported by a plurality of rollers.

  2. Description of the Related Art Conventionally, as a meandering control device, a device that corrects meandering by an EPC (Edge Position Control) roller as described in Patent Document 1 is known. In general, a sensor for detecting meandering is installed at the edge portion of the conveyed product, and the EPC roller adjusts the tension by turning based on the slip data detected by the detecting sensor and corrects meandering.

  Patent Document 2 describes a method for suppressing fluctuations in tension. In the tension fluctuation suppressing method of Patent Document 2, a tension detector for detecting tension is provided between the first roller feeding device and the second feeding roller applied to the strip of the conveyed product, and the first roller feeding device is in a normal operation state. By adjusting the roller speed applied to the second roller feeding device, the tension is maintained in the range of the specified tension value, and fluctuations in tension are suppressed.

  Patent Document 3 describes a mechanism for correcting meandering. The meandering correction mechanism of Patent Document 3 adjusts the suction force of a suction unit that applies tension to the base material according to the degree of the meandering of the base material, thereby correcting the meandering.

JP 2003-226453 A Japanese Patent Laid-Open No. 11-199942 JP 2003-002497 A

However, the prior arts of Patent Documents 1 to 3 have the following problems.
The meandering correction method or apparatus described in Patent Document 1 to Patent Document 3 detects the slip amount of the web-like transported object by a slip detection sensor or the like. Then, the tension control device corrects meandering of the conveyed object by adjusting the tension based on the detected slip amount.

As is well known, in the electrode coating, some rollers that transport the metal foil have an automatic meandering correction function such as a gentle round (crown). For this reason, even if the metal foil slips left and right within a certain range, there is no problem in the electrode coating process. Note that a small slip within such a range can be corrected by the metal foil while it is being transported, and therefore there is no need to correct the meander by the meander correction device.
Therefore, when a metal foil of several thousand meters is conveyed, even if the metal foil slips within a certain range in the width direction, the slip detection sensor does not determine that the meander has occurred.

The conventional meandering correction method or apparatus described in Patent Literature 1 to Patent Literature 3 determines the occurrence of meandering only after the amount of slip detected by a slip detection sensor or the like exceeds a certain range. Based on the detected slip amount, the conveyance tension is adjusted to correct the meandering.
That is, when the metal foil detects a slip within a certain range, the slip detection sensor cannot determine whether the slip can be corrected by itself or a precursor slip that causes meandering. The determination of meandering can only be waited until the detected amount of slip exceeds a certain range.

However, in general, when the meandering of the conveyed product occurs, the size of the meandering increases one after another. For this reason, in order to correct the meandering, even if the carrying tension is adjusted immediately after the meandering is determined, it takes time for the conveyed product to return to the original stable carrying state.
For example, when a metal foil rod such as copper foil or aluminum foil is switched, the friction coefficient between the metal foil and the transport roller may change, so the current transport tension becomes insufficient, and the transported object can meander. High nature.

FIG. 3 shows a graph for determining and correcting meandering according to the prior art. As shown in FIG. 3, the metal foil slipped after a while after the rod was switched. However, since the slip amount is smaller than the slip amount X that the detection sensor determines that the meander is generated, the detection sensor does not determine the meander occurrence. When the time t = t3, the detection sensor detects the slip amount X and determines the occurrence of meandering for the first time. That is, the time t3 has elapsed from when the metal foil starts to slip until it is determined that meandering has occurred.
Further, since the meandering correction is performed after time t = t3, as shown in FIG. 3, the meandering correction time t4 elapses until the metal foil returns to a stable conveyance state after the meandering occurs. .

In this case, even if the coating operation is performed on the meandering metal foil, stable coating cannot be performed. There is a risk that it will be unusable and unusable. In other words, the longer the meandering correction time from the occurrence of meandering to the stable conveyance state, the more metal foil that may not be used increases and the wasteful expense increases.
Therefore, if the meandering tendency of the conveyed product is detected as soon as possible and an appropriate conveying tension is applied, the meandering correction time to a stable conveying state can be shortened, and the metal foil that may not be used can be reduced. It is possible to prevent unnecessary expenditures and reduce product costs.

  Therefore, the present invention has been made to solve the above-described problems, and a transport device that quickly detects a meandering tendency and shortens the meander correction time from the occurrence of meandering to a stable transport state. The purpose is to provide.

In order to solve the above-mentioned problems, the transport device of the present invention has the following characteristics.
(1) In a transport apparatus having a tension control means for applying a predetermined transport tension to a web-shaped transport object transported by a plurality of rollers, a forced meander generating means for forcibly giving a meander to the transport object; An edge sensor that is arranged downstream of the meandering means and detects the meandering amount of the conveyed object, a meandering detecting means for detecting the occurrence of meandering based on fluctuations in the output of the edge sensor, and the meandering detection means generates the meandering Tension change means for changing the transport tension by the tension control means, and the tension change means separates the surface roughness of the transport object and the transport object from the roller. Estimating means for estimating the relationship between the air flying height and the calculating means for calculating the tension required to suppress slippage of the conveyed object based on the relationship between the surface roughness and the air flying height; , Yu Conveying apparatus characterized by having a Rukoto.

(2) In the conveying apparatus described in (1), the forced meandering generating means is an inclined roller arranged to be inclined with respect to the conveyed object.

The conveyance device having the above characteristics has the following operations and effects.
(1) In a transport apparatus having a tension control means for applying a predetermined transport tension to a web-shaped transport object transported by a plurality of rollers, a forced meander generating means for forcibly giving a meander to the transport object; An edge sensor that is arranged downstream of the meandering means and detects the meandering amount of the conveyed object, a meandering detecting means for detecting the occurrence of meandering based on fluctuations in the output of the edge sensor, and the meandering detection means generates the meandering Tension change means for changing the transport tension by the tension control means, and the tension change means separates the surface roughness of the transport object and the transport object from the roller. Estimating means for estimating the relationship between the air flying height and the calculating means for calculating the tension required to suppress slippage of the conveyed object based on the relationship between the surface roughness and the air flying height; , Yu Because the forced meander generation means gives the condition to easily meander the conveyed object, and the conveyed object becomes easy to meander, the meandering tendency of the conveyed object is quickly detected, and the meander is generated quickly. Thus, the meandering correction time from the occurrence of meandering to the stable conveyance state can be shortened to ½ or less, and the metal foil that may not be used as a product can be halved.
For example, when a metal foil rod such as copper foil or aluminum foil is switched, the friction coefficient between the metal foil and the transport roller may change, so the current transport tension becomes insufficient, and the transported object can meander. High nature.
In order to prevent meandering from occurring, it may be possible to set a large conveying tension in advance. However, if the conveyance tension is large, the metal foil may be affected.
Therefore, the conveyance tension cannot be increased or decreased, and thus must be suppressed within a certain range.
In this case, a stable transport can be achieved by forcibly giving the transported object a condition to easily meander, detecting the meandering tendency of the transported object as soon as possible, judging the occurrence of meandering, and applying an appropriate transport tension. The meandering correction time to the state can be reduced to 1/2 or less, the metal foil that may not be used as a product can be halved, a large amount of wasteful expenditure can be prevented, and the product cost can be reduced it can.
In addition, the transport tension for suppressing the slip of the transported object is not calculated by the actual slip amount of the transported object, but is estimated by estimating the relationship between the surface roughness of the web-like transported object and the air floating amount. In order to calculate based on the relationship between the surface roughness of the web-like transported object and the air flying height, the transported object calculates the transport tension for suppressing the slip of the transported object before the meandering actually occurs, Can be applied to transported objects, the meandering correction time from the occurrence of meandering to the stable transporting state can be shortened to half or less, metal foil that may not be used as a product is halved, and wasteful expenditure The product cost can be reduced.

(2) In the conveying apparatus described in (1), the forced meandering generating means is an inclined roller that is inclined with respect to the conveyed object. The forced meander generating means can be realized by using reliable means.

1 is an overall view of a transport device 1. FIG. It is the figure which looked at a part of conveyance apparatus 1 from the top. It is a figure which shows the method of judging meandering by a prior art. (A) It is a figure which shows the fluctuation | variation of the slip amount (DELTA) x by meandering in the case of air floating amount h <average surface roughness (sigma). (B) It is a figure which shows the fluctuation | variation of the slip amount (DELTA) x by meandering in the case of air floating amount h> (three times of average surface roughness) 3 (sigma). (C) (Three times the average surface roughness) 3σ> air flying height h> average surface roughness σ is a diagram showing the fluctuation of the slip amount Δx due to meandering. 7 is a graph showing the relationship between the air flying height h and the conveyance speed V when the conveyance tension T is constant. (A) It is a figure which shows the change of movement amount (DELTA) x by the conveyance tension T changing. (B) It is a figure which shows the change of the conveyance tension T for changing the movement amount (DELTA) x. It is a graph which shows the relationship between the air floating amount h and the conveyance tension T.

Hereinafter, the transport apparatus 1 according to the present invention will be described.
FIG. 1 shows the entire conveying apparatus 1. A coating device (not shown) is provided downstream of the conveying device 1 and applies an active material paste to the surface of the metal foil 10. The web-shaped metal foil 10 is transported from the left to the right in FIG. 1 (in the direction indicated by the arrow S) by the transport device 1. The metal foil 10 is an aluminum foil or a copper foil, and has a thickness of several tens to 20 μm.
As shown in FIG. 1, the metal foil 10 is provided with driving rollers R4 and R5 that are linked to the motor via gears (not shown) at the lower part of the conveyance start part and the conveyance end part, respectively. The driving rollers R4 and R5 rotate in the arrow W direction by the rotation of the motor. The metal foil 10 is conveyed from the left to the right (the direction indicated by the arrow S) by the rotation of the driving rollers R4 and R5.

Further, nip rollers R6 and R7 for applying a constant pressing force are disposed at positions corresponding to the driving rollers R4 and R5 above the conveyance start portion and the conveyance end portion of the metal foil 10. Due to the pressing force of the nip rollers R6 and R7, the metal foil 10 is sandwiched between the driving roller R4 and the nip roller R6 at the transport start portion, and is transported to the transport device 1. At the conveyance end portion, the sheet is sandwiched between the driving roller R5 and the nip roller R7 and conveyed from the conveyance device 1 to a coating device (not shown).
In addition, the transport device 1 is provided with a plurality of rotation-free rollers R1... R3 and R8.

  FIG. 2 is a view of a part of the transport apparatus 1 as viewed from above. As shown in FIG. 2, the axes of the free rollers R <b> 1 and R <b> 3 at the central portion of the transport device 1 are arranged in parallel to the vertical direction Q with respect to the transport direction P of the metal foil 10. The axis of the inclined roller R2, which is a forced meander generating means, is inclined by an inclination angle θ with respect to the vertical direction Q of the conveying direction P of the metal foil 10. In this embodiment, the inclination angle θ is set to θ = 5 °. Although not shown, the axes of the other free rollers R8 to R10 are also arranged parallel to the vertical direction Q with respect to the transport direction P of the metal foil 10. In this embodiment, the inclination angle θ of the inclination roller R2 is set to 5 °, but the inclination angle θ may be set to 5 ° to 10 °.

  An edge sensor 3 for detecting meandering of the metal foil 10 is disposed downstream of the free roller R3. Note that the edge sensor 3 is arranged on the right side of the metal foil 10 because the metal foil 10 moves (meanders) to the right side in the conveyance direction P when being conveyed by the inclined roller R2.

Further, as shown in FIG. 1, a dancer mechanism 2 that controls the conveyance tension is disposed between the free roller R <b> 3 and the edge sensor 3.
The dancer mechanism 2 includes a motor (not shown), a torque roller 21, an interlocking mechanism 22, and a tension control roller R11. The torque roller 21 and the tension control roller R11 are interlocked by an interlocking mechanism 22.
One end of the torsion spring 21a is fixed to the center of the torque roller 21, and gives a constant torque to the tension control roller R11, thereby giving the tension control roller R11 a force to rotate in the arrow D direction. A predetermined conveying tension T is applied to the metal foil 10 by this rotational force.
The other end of the torsion spring 21a is connected to a motor (not shown). The torque of the torsion spring 21a can be changed by the rotation of the motor. Therefore, the conveyance tension T applied to the metal foil 10 by the tension control roller R11 can be adjusted via the interlocking mechanism 22 by changing the torque of the torsion spring 21a.
Therefore, after detecting the meandering of the metal foil 10 by the edge sensor 3, the transport device 1 controls the transport tension T by the dancer mechanism 2 according to the meandering of the metal foil 10.

Next, the relationship between meandering, air flying height h and average surface roughness σ will be described.
The metal foil 10 is supplied to the transport device 1 in units of rods. In the transporting process of the metal foil 10, a metal foil 10 of several thousand meters is wound around one rod, and when the metal foil 10 of one rod is applied, the metal foil 10 is applied by switching to a new rod. Continue to transport.
The inventor has found that the metal foil 10 is often switched before and after the meandering.
Further, as a result of various experiments, the present inventor has found that the cause of the meandering of the metal foil 10 is related to the air flying height h and the average surface roughness σ. It has also been discovered that whether or not the metal foil 10 meanders is determined by the magnitude relationship between the air flying height h and the average surface roughness σ.
Here, the average surface roughness σ represents the roughness of the surface of the roller R and the metal surface of the metal foil 10. The air flying height h represents the distance between the surface of the roller R and the metal surface of the metal foil 10 when the metal foil 10 is conveyed.

ここで、ＡはローラＲのローラ面粗度であり、Ｂは金属箔１０のウエブ面粗度である。数１の式に示すように、平均面粗度σは、ローラＲのローラ面粗度Ａ及び金属箔１０のウエブ面粗度Ｂの２乗平均値である。
ローラ面粗度Ａは、搬送装置１の既有条件であり、一定である。すなわち、ローラ面粗度Ａは、蛇行の発生には直接に関係しない。
よって、平均面粗度σは、ウエブ面粗度Ｂのみに関係すると考えられる。すなわち、搬送される金属箔１０のロッドが変わる次第、ウエブ面粗度Ｂは変化することにより、平均面粗度σは変化する。
したがって、平均面粗度σは大きい場合、ウエブ面粗度Ｂは大きいことを推定でき、金属箔１０の金属面が粗いと考えられる。
すなわち、平均面粗度σは、ウエブ面粗度Ｂから一義的に算出されるため、本実施例では、ウエブ面粗度Ｂの代わりに、平均面粗度σを用いて搬送張力Ｔを算出する。 The average surface roughness σ is calculated from the following equation (1).

Here, A is the roller surface roughness of the roller R, and B is the web surface roughness of the metal foil 10. As shown in Equation 1, the average surface roughness σ is a mean square value of the roller surface roughness A of the roller R and the web surface roughness B of the metal foil 10.
The roller surface roughness A is an existing condition of the transport device 1 and is constant. That is, the roller surface roughness A is not directly related to the occurrence of meandering.
Therefore, it is considered that the average surface roughness σ is related only to the web surface roughness B. That is, as soon as the rod of the metal foil 10 being transferred changes, the web surface roughness B changes, so that the average surface roughness σ changes.
Therefore, when the average surface roughness σ is large, it can be estimated that the web surface roughness B is large, and the metal surface of the metal foil 10 is considered to be rough.
That is, since the average surface roughness σ is uniquely calculated from the web surface roughness B, the transport tension T is calculated using the average surface roughness σ instead of the web surface roughness B in this embodiment. To do.

The surface of the roller R and the metal surface of the metal foil 10 have a plurality of convex peaks. The roughness of the surface of the roller R and the metal surface of the metal foil 10 is determined by the amount of the convex crest and the height of the convex crest. That is, the higher the height of the convex crest, the rougher the surface of the roller R and the metal surface of the metal foil 10 are. Therefore, the surface roughness of the surface of the roller R and the metal surface of the metal foil 10 is large.
When the metal foil 10 is conveyed by the roller R, when the surface roughness of the surface of the roller R and the metal surface of the metal foil 10 is large, that is, when the surface of the roller R and the metal surface of the metal foil 10 are rough, the roller R The surface and the metal surface of the metal foil 10 suppress slippage generated between the surface of the roller R and the metal surface of the metal foil 10 by collision of many high convex peaks.
On the contrary, when the surface roughness of the surface of the roller R and the metal surface of the metal foil 10 is small, that is, when the surface of the roller R and the metal surface of the metal foil 10 are smooth, the surface of the roller R and the metal foil 10 Since the metal surface has a small amount of convex crests and the height of the convex crests is small, the convex crests do not collide so much, so that the surface of the roller R and the metal surface of the metal foil 10 It is thought that slippage is likely to occur between them.

The air flying height h represents a state in which the metal surface of the metal foil 10 floats from the surface of the roller R. As described above, the surface of the roller R and the metal surface of the metal foil 10 have a plurality of convex peaks.
When the air flying height h is large, the plurality of convex ridges on the surface of the roller R and the metal surface of the metal foil 10 are less likely to collide with high convex ridges. Therefore, in this case, it is considered that the convex peaks do not collide with each other between the surface of the roller R and the metal surface of the metal foil 10 and slip easily occurs.
On the contrary, when the air flying height h is small, the plurality of convex ridges on the surface of the roller R and the metal surface of the metal foil 10 include not only high convex ridges but also low convex ridges. collide. Therefore, in this case, it is considered that there are many collisions between convex ridges between the surface of the roller R and the metal surface of the metal foil 10, and the occurrence of slipping is suppressed.

That is, the present inventor believes that the average surface roughness σ and the air flying height h have a close relationship with each other and each influences meandering.
Therefore, when the conveyance tension T is increased, the metal foil 10 is pulled more strongly, and the metal surface of the metal foil 10 approaches the surface of the roller R. That is, by increasing the transport tension T, the air flying height h decreases. As a result, a plurality of convex ridges on the surface of the roller R and the metal surface of the metal foil 10 collide with each other, and the occurrence of slipping can be suppressed. In the prior art, this is considered to be a factor that increases the conveyance tension when correcting meandering.

The inventor summarized the magnitude relationship between the air flying height h and the average surface roughness into three patterns by experiments based on known logic.
Below, when conveying metal foils, such as copper foil and aluminum foil, the relationship between said three patterns and meandering is each demonstrated.
<First pattern>
When the air flying height h <average surface roughness σ, that is, the distance that the metal surface of the metal foil 10 is separated from the surface of the roller R is the convex crest of the surface of the roller R and the protrusion of the metal surface of the metal foil 10. When the value is smaller than the mean square value of the crests, the metal surface of the metal foil 10 comes into close contact with the surface of the roller R, and the convex crest of the surface of the roller R and the metal surface of the metal foil 10 A convex mountain collides. For this reason, the slip which generate | occur | produces between the surface of the roller R and the metal surface of the metal foil 10 can be suppressed, and a meandering hardly arises.

<Second pattern>
When the air flying height h> (three times the average surface roughness) 3σ, that is, the distance that the metal surface of the metal foil 10 is separated from the surface of the roller R is the convex crest on the surface of the roller R and the metal foil 10. When the metal surface of the metal foil 10 is considerably larger than the square average value with the convex crest of the metal surface, the metal surface of the metal foil 10 is in a state of floating from the surface of the roller R. The ratio of collision with the convex crest of 10 metal surfaces is reduced. For this reason, it was experimentally confirmed that slip occurred immediately between the surface of the roller R and the metal surface of the metal foil 10 and the meandering occurred almost certainly.

<Third pattern>
(Three times the average surface roughness) When 3σ> the air flying height h> the average surface roughness σ, that is, the distance that the metal surface of the metal foil 10 is separated from the surface of the roller R is the convex shape of the surface of the roller R. And the metal surface of the metal foil 10 is slightly lifted from the surface of the roller R. However, depending on other conditions, Convex ridges on the surface of the roller R and convex ridges on the metal surface of the metal foil 10 are considered to have fewer collisions compared to the first pattern, and collisions compared to the second pattern. It is thought that there are many.
For this reason, when meandering occurs between the surface of the roller R and the metal surface of the metal foil 10, extra time may be required until the meandering occurs. Therefore, although the metal foil 10 does not immediately meander, the meandering may occur after a long time.

  Actually, the meandering by the third pattern is most problematic in the electrode coating process. The meandering due to the third pattern does not occur immediately and often occurs over a long period of time. Therefore, since the meandering by the third pattern cannot be detected promptly, the meandering correction time from the occurrence of meandering to the stable conveyance state becomes long, and the metal foil that may not be used increases, which is useless. Expense increases.

Next, a method for detecting and correcting meandering mainly by the third pattern will be described.
When the metal foil 10 is transported, the web surface roughness B changes and the average surface roughness σ also changes due to the switching of the rod of the metal foil 10, so that the air flying height h and the average surface roughness σ are large or small. Relationships can change.
For example, when the web surface roughness B1 after switching is smaller than the web surface roughness B that has been stably conveyed until now, that is, when the web surface roughness B1 after the change <the web surface roughness B before the change Since the roller surface roughness A is constant, the average surface roughness σ1 after the change is also smaller than the average surface roughness σ before the change, and the average surface roughness after the change σ1 <the average surface roughness before the change. σ.
Since the metal foil before switching is stably conveyed, it is possible to estimate the air floating amount h <average surface roughness σ before change. However, since the average surface roughness σ1 after the change after switching is smaller than the average surface roughness σ before the change, it is estimated whether the air flying height h is larger or smaller than the average surface roughness σ1 after the change. Can not.
That is, since the air flying height h may be larger than the average surface roughness after the change σ1, there is a possibility that meandering may occur.

Therefore, immediately after the new rod of the metal foil 10 is switched, the meandering can be corrected in a short time if the relationship between the air flying height h and the average surface roughness σ1 after the change can be quickly estimated.
In the present embodiment, an inclined roller R2 that is a forced meandering means for forcibly meandering the metal foil 10 is provided. By the inclined roller R2, the metal foil 10 is given a component force perpendicular to the advancing direction P and given a tendency to meander. In particular, the meandering by the third pattern does not occur immediately after the new rod of the metal foil 10 is switched, and often occurs over a long period of time. For this reason, the meandering is generated early by providing the inclined roller R2. Thereby, the relationship between the air flying height h and the average surface roughness σ1 after the change can be quickly estimated, and the meandering can be corrected in a short time.

<Estimating means>
Next, estimation means for estimating slippage due to meandering of the metal foil 10 of this embodiment will be described.
As shown in FIG. 2, the inclined roller R2 is arranged with an inclination angle θ = 5 °. Thereby, when the metal foil 10 is conveyed by the inclined roller R2, the metal foil 10 slides the movement amount Δx with respect to the forward direction. Theoretically, it is calculated from the equation: Δx = Ytanθ. In this embodiment, the movement amount Δx is set to 4 to 5 mm.

FIG. 4A shows a change in the movement amount Δx when the air floating amount h <average surface roughness σ as the first pattern. When the air flying height h <average surface roughness σ, when the metal foil 10 does not slip due to meandering, the moving amount Δx is displaced by the inclined inclined roller R2 at t = t0, but Δx or more. No slippage occurs.
As shown in FIG. 4A, when no meandering occurs, the movement amount Δx is substantially constant and does not vary greatly even after a long time. For this reason, the metal foil 10 of several thousand meters is stably conveyed without generating meandering while maintaining the movement amount Δx.

  FIG. 4B shows a change in the movement amount Δx in the case of the second pattern, the air flying height h> (three times the average surface roughness) 3σ. When the air flying height h> (3 times the average surface roughness) 3σ, the metal foil 10 immediately generates a large meander. For this reason, as shown in FIG. 4B, even when the metal foil 10 is not conveyed by the inclined inclined roller R2 at t = t0, a large movement amount Δx is detected, and the meandering correction is immediately performed. There is a need to do.

FIG. 4C shows a change in the movement amount Δx in the third pattern (three times the average surface roughness) 3σ> the air flying height h> the average surface roughness σ. (Three times the average surface roughness) When 3σ> air flying height h> average surface roughness σ, as shown in FIG. 4 (c), the metal foil 10 has been moved for a while after being conveyed Δx. However, it is not a slip that is determined to be meandering.
However, when the metal foil 10 is conveyed by the inclined roller R2 having the inclination angle θ at t = t0, the metal foil 10 is given a component force perpendicular to the forward direction P, and the meandering tends to occur. As a result, the movement amount Δx of the metal foil 10 cannot be maintained at a constant value and is disturbed.
In this case, the edge sensor 3 that detects meandering detects a disturbance in the movement amount Δx and detects that meandering occurs.

数２に示す式において、Ｒは搬送装置１の傾斜ローラＲ２の半径であり、Ｖは搬送装置１の搬送速度であり、Ｔは搬送張力である。よって、半径Ｒ、搬送速度Ｖ及び搬送張力Ｔは、搬送装置１の既有条件である。
よって、上記の数１の式から、空気浮上量ｈが算出できる。 At this time, if the occurrence of meandering is detected, the air flying height h is estimated.
Equation 2 is an expression for calculating the air flying height h.

In the equation shown in Formula 2, R is the radius of the inclined roller R2 of the transport device 1, V is the transport speed of the transport device 1, and T is the transport tension. Therefore, the radius R, the conveyance speed V, and the conveyance tension T are the existing conditions of the conveyance apparatus 1.
Therefore, the air flying height h can be calculated from the above equation (1).

FIG. 5 is a graph showing the air flying height h calculated by the equation shown in Equation 1 on the assumption of a certain transport tension T.
The horizontal axis represents the conveyance speed V, and the vertical axis represents the air flying height h. Curves L1, L2, and L3 indicate the air flying height h when the radius R of the inclined roller R2 is 15, 50, and 125, respectively.
If the conveyance speed V of the conveyance device 1 and the radius R of the inclined roller R2 are known from the graph of FIG. 5, the air flying height h of the metal foil 10 can be estimated. For example, when the conveyance speed is 40 m / min and the roller radius is R = 50, the air flying height h = h1 can be read from the intersection of the curve L2 and the straight line of the conveyance speed V = V1.

FIG. 7 is a diagram showing the relationship between the air flying height h and the transport tension T.
A curve Z1 indicates the relationship between the air flying height h and the conveyance tension T when the conveyance speed V = V1. According to FIG. 7, when the air flying height h = h1, the transport tension T = T1 can be calculated. However, since the occurrence of meandering is detected from the disturbed movement amount Δx detected by the edge sensor 3, the air flying height h is larger than the average surface roughness σ1 after the new rod of the metal foil 10 is conveyed. Can be estimated.
Therefore, in order not to meander the metal foil 10, it is necessary to make the air flying height h = h1 smaller than the average surface roughness σ1 after the change.
Actually, the average surface roughness σ is a numerical value that cannot be measured. Therefore, the air flying height h cannot be adjusted to a certain value.

<Calculation means>
The inventor has determined the amount by which the optimum air flying height h is changed based on the evaluation results. In this embodiment, the air flying height h is decreased by 10%. That is, the air flying height h = h1 before the change is reduced by 10% to obtain the air flying height h2 after the change.
From FIG. 6, since the air flying height h is changed from the air flying height h1 before the change to the air flying height h2 after the change, it is necessary to increase from the transport tension T1 before the change to the transport tension T2 after the change. I can read.
Then, the calculated transfer tension T <b> 2 is transmitted to the dancer mechanism 2. The dancer mechanism 2 increases the transport tension T1 before the change to the transport tension T2 after the change. Thereby, the air flying height h1 before the change is reduced to the air flying height h2 after the change, and the meandering is suppressed.

  Here, reducing the air flying height h by 10% is the result of the inventor's experiment and learning about meandering correction after switching a large number of metal foil rods. In other cases, it may be possible to use an optimal numerical value based on the learned result.

FIGS. 6A and 6B are diagrams showing adjustment of the transport tension T for correcting the meandering. As shown in FIG. 6A, the movement amount Δx is constant until t = t1, and no meandering occurs. Correspondingly, in FIG. 6B, control is performed with the transport tension T1 before the change. However, at t = t1, the movement amount Δx starts to be disturbed. This may cause meandering. Therefore, in order to prevent further meandering, the conveyance tension is increased to the conveyance tension T2 after the change according to the graph of FIG.
As shown in FIG. 7, by increasing the transport tension T1 before the change to the transport tension T2 after the change, the air flying height h2 after the change is reduced. Therefore, if the air flying height h2 after the change is smaller than the average surface roughness σ1 after the change, that is, if the formula of the air flying height h <average surface roughness σ is satisfied, the meandering is corrected. That is, as shown in FIG. 6A, the meander correction time t2 has elapsed from the occurrence of meandering to the return to a stable conveyance state.

The inventor has proved by experiment that the meandering correction time t4 of the prior art is more than twice the meandering correction time t2 of this embodiment.
Therefore, according to the present invention, it is possible to calculate the conveyance tension for suppressing the slip of the conveyed product before the actual meandering occurs, and to apply the tension to the conveyed item. The meandering correction time to the transport state can be shortened, the metal foil that may not be used as a product can be halved, and unnecessary expenses can be reduced.

As explained in detail above, according to the transport apparatus 1 of the present embodiment,
(1) In the conveying apparatus 1 having the dancer mechanism 2 that applies a predetermined conveying tension T to the metal foil 10 conveyed by the plurality of rollers R1... R11, the inclined roller R2 that forcibly imparts a meander to the metal foil 10. And an edge sensor 3 that is disposed downstream of the inclined roller R2 and detects the amount of meandering of the metal foil 10, and a meandering detecting means (an inclined roller R2 and an edge) that detects the occurrence of meandering based on output fluctuations of the edge sensor 3. Sensor 3) and meandering detecting means (tilting roller R2 and edge sensor 3), when detecting the occurrence of meandering, tension changing means for changing conveying tension T by means of dancer mechanism 2 (graphs of FIGS. 5 and 7) And the dancer mechanism 2), the forced meander generation means gives the condition that the conveyed object is easy to meander, and the conveyed object becomes easy to meander. The tendency can be detected quickly and it can be determined that meandering occurs promptly. The meandering correction time from the occurrence of meandering to the stable conveyance state can be reduced to 1/2 or less, and it cannot be used as a product. The metal foil that can be feared can be halved.
For example, when a metal foil rod such as copper foil or aluminum foil is switched, the friction coefficient between the metal foil and the transport roller may change, so the current transport tension becomes insufficient, and the transported object can meander. High nature.
In order to prevent meandering from occurring, it may be possible to set a large conveying tension in advance. However, if the conveyance tension is large, the metal foil may be affected.
Therefore, the conveyance tension cannot be increased or decreased, and thus must be suppressed within a certain range.
In this case, a stable transport can be achieved by forcibly giving the transported object a condition to easily meander, detecting the meandering tendency of the transported object as soon as possible, judging the occurrence of meandering, and applying an appropriate transport tension. The meandering correction time to the state can be reduced to 1/2 or less, the metal foil that may not be used as a product can be halved, a large amount of wasteful expenditure can be prevented, and the product cost can be reduced it can.

(2) In the conveying apparatus 1 described in (1), the inclined roller R2 is an inclined roller disposed to be inclined with respect to the metal foil 10, so that the inclined roller is relatively simple and reliable. Using such means, a forced meander generating means can be realized.

(3) In the conveying apparatus 1 described in (1) or (2), the tension changing means (the graph of FIG. 5, the graph of FIG. 7 and the dancer mechanism 2) is uniquely determined from the web surface roughness B of the metal foil 10. 5 and the graph of FIG. 5 for estimating the average surface roughness σ calculated in step S1 and the air flying height h at which the metal foil 10 is separated from the rollers R1... R11, the average surface roughness σ and the air flying height h. 7 for calculating the transport tension T necessary for suppressing the slip of the metal foil 10, based on the above, the transport tension for suppressing the slip of the transported object is the actual tension of the transported object. Rather than calculating by the slip amount, the surface roughness and air flying height of the web-like transported object are estimated, and based on the estimated surface roughness and air flying height of the web-like transported object, the transported object is calculated. Before the meandering actually occurs, set the transport tension to suppress the slip of the transported object. It can be calculated and applied to the transported object, the meandering correction time to the stable transport state after the meandering has occurred can be reduced to 1/2 or less, and the metal foil that may not be used as a product is halved, Unnecessary expenses can be reduced and product costs can be reduced.

It should be noted that the above-described embodiments and modifications thereof are merely examples and do not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.
For example, in this embodiment, the transport tension T is calculated based on the air flying height h and the average surface roughness σ. However, since the air flying height h and the average surface roughness σ are closely related, it may be considered to calculate the transport tension T based only on one of the air flying height h and the average surface roughness σ. It is done.

In addition, the conveyance speed V may be increased in order to increase production efficiency. However, it can be seen from the equation shown in Equation 1 that the air flying height h and the conveyance speed V have a direct proportional relationship. As shown in FIG. 5, the air flying height h increases as the conveying speed V increases. As described above, the air flying height h is a cause of meandering. That is, when the air flying height h increases, meandering may occur.
As shown in FIG. 7, the curve Z2 shows the relationship between the air flying height h and the transport tension T when the transport speed V = V2. For example, when the transport speed V2 after the change is increased to twice the transport speed V1 before the change, that is, when the transport speed is increased from the transport speed V1 of the curve Z1 to the transport speed V2 of the curve Z2, the transport tension T If the current state is maintained as it is, the air flying height h3 increases from h3 to h4. As described above, the air flying height h4 after the change may be larger than the current average surface roughness σ, and there is a risk of meandering.
Therefore, when the speed is increased from the transport speed V1 to the transport speed V2, it is necessary to increase the current transport tension T3 to the transport tension T4 after the change in order to maintain the air flying height h3 as shown in FIG. There is. Thereby, even if the conveyance speed V1 is increased to the conveyance speed V2, the air flying height h3 does not change, so that it is considered that the meandering can be prevented.

DESCRIPTION OF SYMBOLS 1 Conveyance apparatus 2 Dancer mechanism 3 Edge sensor 10 Metal foil R2 Inclination roller R4, R5 Driving roller R6, R7 Nip roller R11 Tension control roller P Conveyance direction Q Vertical direction θ Inclination angle h Air floating amount V Conveyance speed T Conveyance tension A roller Surface roughness B Metal foil surface roughness σ Average surface roughness

Claims (2)

In a transport apparatus having tension control means for applying a predetermined transport tension to a web-shaped transport object transported by a plurality of rollers,
Forced meander generating means for forcibly imparting meander to the conveyed product;
An edge sensor that is arranged downstream of the forced meandering means and detects the meandering amount of the conveyed product;
Meander detection means for detecting the occurrence of meandering based on the output fluctuation of the edge sensor;
Tension change means for changing the transport tension by the tension control means when the meander detection means detects the occurrence of meandering ,
The tension changing means is
Estimating means for estimating the relationship between the surface roughness of the conveyed product and the air flying height at which the conveyed product is separated from the roller;
Based on the relationship between the surface roughness and the air flying height, calculating means for calculating a tension necessary for suppressing slippage of the conveyed product,
A conveying apparatus comprising: In the conveyance apparatus described in Claim 1,
The conveying device, wherein the forced meander generating means is an inclined roller arranged to be inclined with respect to the conveyed product.

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