JP5204440B2 - Tension generating mechanism for winding device - Google Patents

Description

  The present invention relates to a tension generating mechanism for a winding device for winding a strip such as a separator used as a material for a capacitor or a battery.

  For example, as a battery element material for a lithium battery, a positive electrode current collector in which a positive electrode active material is applied to a metal current collector at regular intervals, and a negative electrode current collector in which a negative electrode active material is applied to a metal current collector at regular intervals. There is an electric body. A lithium battery is obtained by winding a positive electrode current collector and a negative electrode current collector in a roll shape through an insulator such as a separator, and storing them in a case. In addition to the positive electrode current collector, the negative electrode current collector, and the separator described above, the electrode foil band of the capacitor is generically referred to as a band-like material below.

  Patent Document 1 discloses a technique for generating a tension in a band by sandwiching the band with a clamp and pulling the clamp in the longitudinal direction of the band. When tension is generated by such a mechanical load, it is difficult to adjust the delicate strength of the tension. In particular, in the process of winding a thin separator with a winding shaft, it is difficult to stably apply a tension enough to stretch the thin paper to the separator.

Patent document 2 is disclosing the winding apparatus which attracts | sucks the edge part of a strip | belt-shaped object. This winding device has an advantage that when the strip is pulled out between the pair of feeding rollers, the strip does not have to be clamped directly by a clamp or the like. However, an appropriate tension cannot be generated in the band unless the band is sandwiched between the pressing plate and the separator guide in the process of winding the band.
JP 2000-277400 A JP 2002-110486 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a winding device tension generating mechanism that reduces the size of a winding device, simplifies the structure thereof, and generates an appropriate tension on a belt-like object regardless of a mechanical load. It is another object of the present invention to provide a tension generating mechanism for a winding device that can increase or decrease the length of winding the band according to the specifications of a capacitor or a battery made of the band. .

The tension generating mechanism for a winding device according to the present invention supports a belt-like material supplying means for feeding the belt-like material in its longitudinal direction, two winding shafts for winding the belt-like material, and the two winding shafts. A rotating member that rotates, a cutter that cuts the belt-like object, a suction guide member that has a guide surface that guides the belt-like object and has a suction port formed in the guide surface, and the belt-like member at the suction port of the suction guide member A suction means for generating a suction force for sucking the object, the belt-like object fed from the belt-like material supply means is wound around one of the two winding shafts, and the one winding shaft In the state in which the belt in the longitudinal direction of the belt wound around is engaged with another winding shaft of the two winding shafts, the rotation of the rotating member is stopped, and the belt is cut into the cutter. that in process to be wound to the other winding shaft from the position, of the suction guide member Characterized in that for sliding contact with said strip to the inner surface.

Further, the tension generating mechanism for winding apparatus according to the present invention, between the position and the other winding shaft to be cut by the cutter of the strip, by pressing the guide surface of the suction guide member, When the belt-like object is bent and the belt-like object is wound around the other winding shaft, the length of the stroke from the position where the belt-like object is cut by the cutter to the other winding shaft is set. equal strip, characterized in Rukoto fed from the belt-like material supplying means.

  Furthermore, the tension generating mechanism for a winding device according to the present invention includes: a negative pressure generating means for supplying a negative pressure to the suction port of the suction guide member; and the suction guide member and the negative pressure generating means. And a vacuum pressure reducing valve interposed therebetween.

  According to the tension generating mechanism for a winding device according to the present invention, the belt-like object is sucked into the suction port while being in sliding contact with the guide surface of the suction guide member in the process of winding the belt-like object. A frictional force is generated between the guide surface and the guide surface. Thereby, a strip | belt thing can be moderately tensioned regardless of a load, and the twist or slack of a strip | belt thing can be prevented. Further, the suction force generated by the suction means at the suction port of the suction guide member can be adjusted by the action of the vacuum pressure reducing valve. Alternatively, the above suction force can be adjusted by increasing or decreasing the number of suction ports or the diameter of the suction ports. Therefore, according to the tension generating mechanism, the belt can be moderately tensioned according to the specifications of a capacitor or a battery made of the belt. This point is advantageous for manufacturing a small capacitor or the like in which the separator must be wound relatively loosely.

  Furthermore, according to the tension generating mechanism for a winding device according to the present invention, a belt having a predetermined length can be wound around the winding shaft as follows. That is, the belt-shaped member is fed out from the original fabric, and the winding shaft is engaged in the middle of the belt-shaped object in the longitudinal direction. Then, between the position where the strip is cut by the cutter (hereinafter referred to as “cutting position”) and the winding shaft, the guide surface of the suction guide member is pressed against the strip and the strip is bent, The stroke from the cutting position to the winding axis is set to a distance that is half the predetermined length. If the strip of the same length is further fed out from the original fabric while the winding shaft winds up the half of the predetermined length, the length of the strip wound on the winding shaft The total amount reaches a predetermined length.

  Furthermore, according to the tension generating mechanism for a winding device according to the present invention, when the suction guide member moves in a direction in which the guide surface is pressed against the strip, the deflection of the strip increases and the distance of the above-described stroke increases. Alternatively, when the suction guide member moves in the opposite direction, the bending of the belt-like object is reduced, and the distance of the stroke is shortened. For this reason, according to the specification of the capacitor | condenser or battery etc. which use a strip | belt-shaped material as a material, the length of the strip | belt-shaped material wound around a winding shaft can be changed freely.

  In addition, the tension generating mechanism for a winding device according to the present invention can achieve the effects described above only by forming a suction port on the guide surface of the suction guide member and pressing the guide surface against the belt-like object. For this reason, since the conventional clamp and the drive part for applying a load to this are unnecessary, the structure is very simple and the whole of the said apparatus can be reduced in size.

  1 to 5 sequentially show the operation of the tension generating mechanism 1 for the winding device. The positive electrode current collector, the negative electrode current collector, and the separator that have already been described are wound simultaneously by the tension generating mechanism 1 for a winding device, but the following explanation focuses on a single strip that is a separator. Assumed to be performed.

  As shown in FIG. 1, the tension generating mechanism 1 for a winding device includes a belt-like material supply means 3 for feeding the belt-like material 2 in its longitudinal direction, two winding shafts 4, 5 for winding the belt-like material 2, 2 Rotating members 7 that respectively support the winding shafts 4 and 5 and the four guide rollers 6, a cutter 8 that operates so as to cross the cutting position P indicated by dots in the drawing, and a guide surface that can guide the belt-like object 2. 9 and a suction guide member 11 having a plurality of suction ports 10 formed in the guide surface 9 and a suction means described later.

  The belt-like material supply means 3 includes a pair of feeding rollers 31 that sandwich the belt-like material 2, a pair of support rollers 32 that support the belt-like material 2, and a tension roller 33 that pulls the belt-like material 2 below the pair of support rollers 32. Prepare. By rotating the pair of feeding rollers 31, the belt-like object 2 is fed from the original fabric 21.

  In addition to being able to rotate counterclockwise in the drawing, the winding shaft 5 can move in and out of the front surface 71 of the rotating member 7 by moving back and forth in the axial direction. The winding shaft 5 forms a slit 51 opened at the tip thereof. The slit 51 has a width through which the strip 2 can pass. Since the two winding shafts 4 and 5 are similar to each other, description of the winding shaft 4 is omitted. The cutter 8 can advance and retreat in the directions of arrows a and b.

  The rotating member 7 is a disk that can rotate in the direction of the arrow α. Each time the rotating member 7 rotates 180 °, the respective positions of the winding shafts 4 and 5 are switched up and down. Since the four guide rollers 6 are arranged concentrically at a pitch of 90 °, the relative arrangement does not change even if the rotating member 7 rotates 180 °.

  The suction guide member 11 can advance and retreat in the directions of arrows a and b in the figure. As shown in FIG. 6, the suction guide member 11 is made of a bar material having a front end 91 and upper and lower edges 92 as a guide surface 9. As shown in FIG. 1, an air passage 12 is formed inside the suction guide member 11, and each suction port 10 penetrates from the guide surface 9 to the air passage 12. The air passage 12 is connected to the negative pressure generating means 14 through a vacuum pressure reducing valve 13 shown in FIG.

  The suction means 15 includes a vacuum pressure reducing valve 13 and a negative pressure generating means 14. Although the operator may operate the vacuum pressure reducing valve 13, the suction means 15 is controlled by using the control device 16 mainly composed of a programmable controller or the like, so that the suction means 15 can suck the suction port 10 of the suction guide member 11. The suction force generated may be adjusted. Alternatively, the suction force generated by the suction means 15 at the suction port 10 of the suction guide member 11 may be adjusted by increasing or decreasing the number of suction ports 10 or the diameter of the suction ports 10. Further, a vacuum pump may be applied as the negative pressure generating means 14. Alternatively, when a vacuum line is piped to supply a negative pressure to a site such as a factory, the air passage 12 may be connected to the vacuum line.

  Further, as shown in FIGS. 1 and 7, a backup member 17 is provided at a position facing the cutter 8. The backup member 17 advances and retreats in the directions of arrows c and d in the figure. A plurality of suction ports 19 are formed in the front end surface 18 of the backup member 17, and these are connected to the negative pressure generating means 14.

  The above-described rotation or advance / retreat operation of the elements is realized by individual drive sources. A rotary machine such as a servo motor, an air cylinder, or a hydraulic cylinder may be applied as a drive source. The control device 16 realizes the operation of the winding device tension generating mechanism 1 by controlling the drive source. This operation will be described in detail in the embodiment.

  The tension generating mechanism 1 for a winding device winds a strip 2 having a predetermined length (for example, about 300 mm) necessary for manufacturing one capacitor or battery as follows. At the beginning of the following sentence, English letters are used to distinguish the operation process of the tension generating mechanism 1 for the winding device.

A: The winding shaft 4 shown in FIG. 1 rotates, and the strip 2 is wound around the winding shaft 4. The rotating member 7 rotates 180 °, and the winding shaft 4 is lowered to a position lower than the cutter 8 as shown in FIG. In this state, the winding shaft 5 is immersed in the front surface 71 of the rotating member 7, so that the tip of the winding shaft 5 is deviated from the strip 2. Further, the winding shaft 5 is stopped with the direction of the slit 51 aligned with the longitudinal direction of the strip 2.

B: The winding shaft 5 protrudes from the front surface 71 of the rotating member 7 toward the strip 2, and the strip 2 enters the slit 51 of the winding shaft 5. As a result, the winding shaft 5 is engaged in the middle of the strip 2 in the longitudinal direction.

  C: The suction guide member 11 moves forward in the direction of arrow a, and presses the guide surface 9 against the strip 2 as shown in FIG. As a result, the belt-like object 2 is greatly bent. Further, the distance of the stroke from the cutting position P to the winding shaft 5 is increased by the amount of bending of the band 2, and at the same time, the band 2 having a length that compensates for this is fed out from the band supply means 3. When the suction guide member 11 stops at the illustrated position, the distance of the stroke from the cutting position P to the winding shaft 5 is half the predetermined length (about 150 mm).

  An electromagnetic on-off valve may be provided between the air passage 12 and the negative pressure generating means 14 of the suction guide member 11 shown in FIG. In this case, when the suction guide member 11 is in the position shown in FIG. 2, the negative pressure of the negative pressure generating means 14 can be cut off from the suction port 10 by closing the electromagnetic on-off valve. The control device 16 may open the electromagnetic on-off valve in anticipation of the timing at which 9 contacts the belt-like object.

  D: The backup member 17 advances in the direction of the arrow c, and the front end surface 18 is brought into contact with the belt-like object 2 as shown in FIG. As a result, the belt-like object 2 is sucked into the suction port 19 and fixed in the vicinity of the cutting position P. Subsequently, the cutter 8 moves forward in the direction of the arrow a and cuts the strip 2 at the cutting position P, so that the strip 2 already wound around the winding shaft 4 and the above B are shown in FIG. In this step, the belt-like object 2 engaged with the winding shaft 5 can be separated. By this cutting, an end portion 22 is formed in the strip 2. In addition, the rotation of the winding shaft 4 is continued in the processes after A, and the strip 2 is wound around the winding shaft 4 until it becomes a roll shape as illustrated.

  An electromagnetic on-off valve may be provided between the negative pressure generating means 14 and the suction port 19 of the backup member 17 shown in FIG. In this case, the negative pressure of the negative pressure generating means 14 can be cut off from the suction port 19 by closing the electromagnetic on-off valve, and in the process D, the timing when the tip surface 18 contacts the belt-like object is estimated, and the control device 16 may open the electromagnetic on-off valve.

  E: Adhesive tape or the like is attached to the roll-shaped strip 2 wound around the winding shaft 4. The sealing device that performs this prevents the strip 2 from being unwound and is not an element that constitutes the tension generating mechanism 1 for the winding device. Subsequently, the winding shaft 4 is immersed in the front surface 71 of the rotating member 7. Thereby, since the winding shaft 4 comes off from the belt-like object 2, the belt-like object 2 falls from the illustrated position. A chute that is not shown in the figure is provided below the winding shaft 4 in order to guide the strip 2 to other places.

  F: The winding shaft 5 rotates immediately after the strip 2 is cut in the step D, and the strip 2 is wound around the winding shaft 5. The belt-like object 2 moves while being in sliding contact with the guide surface 9 of the suction guide member 11 as it is wound around the winding shaft 5 and is sucked into the suction port 10 of the suction guide member 11. A frictional force is generated between Accordingly, the belt-like object 2 can be moderately tensioned without depending on the load, and the twisting or slackening of the belt-like object 2 can be prevented. Further, the strength of the suction force of the suction means 15 is adjusted by raising and lowering the negative pressure generated by the negative pressure generating means 14 shown in FIG. The tension of the belt-like object 2 can be freely adjusted. For this reason, according to the specifications of a capacitor or a battery using the strip 2 as a material, the force by which the strip 2 fastens the winding shaft 4 can be adjusted.

  G: Since the winding shaft 5 continues to rotate and the strip 2 is further wound around the winding shaft 5, the end 22 of the strip 2 is detached from the suction guide member 11 and is wound around the winding shaft 5. It reaches. On the other hand, the distance from the strip supply means 3 to the winding shaft 5 is not limited, but it is the same length between the time when the strip 2 is cut and the end 22 is wound around the winding shaft 5. The strip 2 is fed from the strip supply means 3. For this reason, the winding shaft 5 winds the belt-shaped object 2 half of a predetermined length simultaneously from two directions, and the total length (about 150 mm × 2) of the belt-shaped object 2 wound by the winding shaft 5 is Reach a predetermined length.

  H: The cutter 8 and the suction guide member 11 are retracted in the direction of the arrow b, and the backup member 17 is retracted in the direction of the arrow d. Thereafter, the processes after A are repeated.

  In the process C, if the distance by which the suction guide member 11 moves forward in the direction of arrow a is shortened as shown in FIG. Accordingly, the distance of the stroke from the cutting position P to the winding shaft 5 is shortened, and the length of the strip 2 wound around the winding shaft 5 is shortened. Accordingly, the length of the strip 2 wound around the winding shaft 5 can be freely increased or decreased simply by increasing or decreasing the distance that the suction guide member 11 advances in the direction of arrow a. It is possible to easily cope with changes in specifications of batteries and the like.

  It should be noted that the present invention can be implemented in various improvements, modifications, or variations based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Further, any of these forms belongs to the scope of the present invention.

  The present invention is not limited to battery element materials or capacitor separators, and is a useful technique for winding strips of any material.

The front view which shows the 1st step of operation | movement of the tension | tensile_strength generating mechanism for winding apparatuses which concerns on embodiment of this invention. The front view which shows the 2nd step of operation | movement of the tension | tensile_strength generating mechanism for winding apparatuses which concerns on embodiment of this invention. The front view which shows the 3rd step of operation | movement of the tension | tensile_strength generating mechanism for winding apparatuses which concerns on embodiment of this invention. The front view which shows the 4th step of operation | movement of the tension | tensile_strength generating mechanism for winding apparatuses which concerns on embodiment of this invention. The front view which shows the 5th step of operation | movement of the tension generation mechanism for winding apparatuses which concerns on embodiment of this invention. The perspective view of the principal part of the attraction | suction guide member applied to the tension generation mechanism for winding apparatuses which concerns on embodiment of this invention. The block diagram which shows the structure of the tension generation mechanism for winding apparatuses which concerns on embodiment of this invention. The front view which shows the other operation example of the tension generation mechanism for winding apparatuses which concerns on embodiment of this invention.

Explanation of symbols

1: Tension generating mechanism for winding device 2: Band-like material 4, 5: Winding shaft 8: Cutter 9: Guide surface 10: Suction port 11: Suction guide member 13: Vacuum pressure reducing valve 14: Negative pressure generating unit 15: Suction unit

Claims (3)

A strip feeding means for feeding the strip in its longitudinal direction, two and winding shaft for winding said strip, a rotary member which rotates and supports the two winding shaft, cutter for cutting the strip A suction guide member having a guide surface for guiding the belt-like object and having a suction port formed in the guide surface; and a suction means for generating a suction force for sucking the belt-like object at the suction port of the suction guide member. Prepared,
The belt-shaped material fed out from the belt-shaped material supply means is wound around one of the two winding shafts, and the two strips wound on the one winding shaft are in the longitudinal direction. The rotation of the rotating member is stopped in a state of being engaged with another winding shaft of
Tension generation for a winding device, wherein the belt-like object is brought into sliding contact with the guide surface of the suction guide member in a process of winding the belt-like object on the other winding shaft from a position where the belt-like object is cut by the cutter. mechanism. Between position and the other winding shaft to be cut by the cutter of the strip, by pressing the guide surface of the suction guide member, to deflect said strip,
When the belt-like object is wound on the other winding shaft, the belt-like object having a length equal to the length of a stroke from the position of the belt-like material cut by the cutter to the other winding shaft is obtained. winder for tensioning mechanism according to claim 1, characterized in Rukoto fed from the object supply means.   The suction means includes a negative pressure generating means for supplying a negative pressure to the suction port of the suction guide member, and a vacuum pressure reducing valve interposed between the suction guide member and the negative pressure generating means. The tension generating mechanism for a winding device according to claim 1 or 2.

Images