JP2014144832A - Winding core and sheet holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding core that enables a sheet to be easily held and detached by a relatively simple configuration, and a sheet holding method using the same.SOLUTION: A winding core 10 assumes an elastically-deformable cylindrical shape in which a cut is formed along the axial direction of the winding core 10, and a pair of ends 21 and 22 in the circumferential direction of the winding core 10 faces each other in the radial direction of the winding core 10. In a state in which a sheet S is inserted between the pair of ends 21 and 22, the winding core 10 is pressed outward from the inside to make the sheet S held in a sandwiched manner by the pair of ends 21 and 22.

Description

  The present invention relates to a winding core and a sheet holding method using the winding core.

  For example, a method of manufacturing a secondary battery as a power storage device includes a method of winding a sheet-like electrode or a separator. In this case, in order to collect a sheet such as a broken piece of the electrode, the sheet may be collected by fixing the sheet to the core and rotating the core. Here, as an example of fixing the sheet to the core, for example, Patent Document 1 describes attaching an inflatable air tube to a rubber sleep as a core.

Japanese Patent Application Laid-Open No. 09-10834

  Here, when discarding the sheet wound up by the core, it is considered to discard the entire core. In this case, since the core cannot be reused, there is a concern about cost increase. In addition, from the viewpoint of recycling, separation may be required at the time of disposal.

  On the other hand, it can be considered that the sheet is separated from the core and then discarded. In this case, for example, in a configuration in which the sheet is fixed to the core using a tape, an operation such as winding the sheet again to another is required, and the removal of the sheet from the core is likely to be complicated. However, the above-described configuration in which the air tube is attached to the core has a concern that the configuration of the core is complicated.

  The present invention has been made in view of the above-described circumstances, and has a relatively simple configuration, a core that can be easily held and detached, and a sheet that uses the core. It aims to provide a method.

  A winding core that achieves the above object is for holding a sheet, and the winding core is an elastically deformable cylindrical shape with a cut along an axial direction, and a pair of circumferential directions of the winding core. The end portion faces the radial direction of the core.

  According to this configuration, when the core is pressed from the inside to the outside with the sheet inserted between the pair of end portions, the core is elastically deformed, and the sheet is sandwiched between the pair of end portions. The sheet is held on the core. Further, when the pressure on the core is released, the sheet is not held between the pair of end portions, so that the sheet can be easily removed from the core. Thereby, it is possible to easily hold and remove the sheet with a relatively simple configuration.

  In the winding core, the pair of end portions have a pair of facing surfaces facing each other, and the pair of facing surfaces are respectively continuous with the outer circumferential surface of the winding core, and with respect to the circumferential direction of the winding core. The first opposing surface intersecting with the first opposing surface, the second opposing surface along the circumferential direction of the core, the second opposing surface and the inner peripheral surface of the core, It is good to have the 3rd opposing surface which cross | intersected with respect to the circumferential direction of the said core. According to this structure, the 2nd opposing surface of a pair of edge part opposes the radial direction of a core. Therefore, the sheet can be suitably held by the pair of end portions.

  In the core, the first facing surface is inclined with respect to the radial direction of the core, and an angle formed by the first facing surface and the second facing surface is preferably larger than 90 °. . According to such a configuration, since the angle formed by the first facing surface and the second facing surface is greater than 90 °, it is possible to facilitate the insertion of the sheet between the pair of end portions.

  In the sheet holding method using the above-described core, the core is disposed at a position where the inner peripheral surface of the core is opposed to the outer peripheral surface of the cylindrical shaft, and between the pair of ends. The step of inserting the sheet, and pressing the core from the inside to the outside with a claw portion existing on the outer peripheral surface of the shaft, thereby fixing the shaft and the core, and the pair of ends And a step of sandwiching the sheet by the section.

  According to this configuration, the shaft and the core are fixed by pressing the core from the inside toward the outside with the claw portion of the shaft. Accordingly, the sheet is held between the pair of end portions. Thereby, a sheet | seat can be hold | maintained by the process of fixing a winding core to a shaft. Further, if the pressing by the claw portion is released, the holding of the sheet by the pair of end portions is released, so that the sheet can be easily removed from the core.

  According to the present invention, it is possible to easily hold and remove a sheet with a relatively simple configuration.

The perspective view which shows typically the outline | summary of a winding core and a winding device. The fragmentary sectional view which expands and shows an edge part periphery. (A) is sectional drawing of the core of an initial state, (b) is the elements on larger scale of (a). (A) is sectional drawing of the core after elastic deformation, (b) is the elements on larger scale of (a). The top view which shows the core and the wound sheet | seat. The fragmentary sectional view which shows the edge part of another example. The fragmentary sectional view which shows the edge part of another example. Sectional drawing which shows the core of another example.

Hereinafter, an embodiment of a core and a sheet holding method using the core will be described. 3 and 4, the cross-sectional structure of the shaft 101 is shown in a simplified manner.
As shown in FIG. 1, the winding core 10 has a cylindrical shape that can be elastically deformed with a cut along the axial direction. The winding core 10 can be fixed to a winding device 100 having a cylindrical shaft 101 having an outer diameter slightly shorter than the inner diameter of the winding core 10. The shaft 101 has a plurality of claw portions 102 that can exist and appear on the outer peripheral surface 101 a of the shaft 101. When the pressure in the shaft 101 increases due to the supply of air into the shaft 101, the plurality of claw portions 102 are arranged at the outer peripheral surface 101a of the shaft 101 from the immersive position where they are immersed in the outer peripheral surface 101a of the shaft 101. In contrast, the shaft 101 moves to a protruding position protruding in the radial direction. When the shaft 101 is inserted into the core 10 and moved to the protruding position, the plurality of claw portions 102 press the core 10 from the inside to the outside, thereby fixing the core 10 and the shaft 101. To do.

  As shown in FIG. 1, the core 10 has a pair of end portions 21 and 22 in the circumferential direction. The circumferential ends 21 and 22 of the core 10 extend from one end to the other end in the axial direction of the core 10 along the axial direction of the core 10.

  FIG. 2 is a partial cross-sectional view of the winding core 10 cut in a direction orthogonal to the axial direction. As shown in FIG. 2, the pair of circumferential ends 21, 22 of the core 10 are opposed to the radial direction of the core 10, and the circumferential ends of the ends 21, 22 are free ends. It has become.

  The pair of end portions 21 and 22 has a pair of facing surfaces 31 and 32 that face each other. As shown in FIG. 2, the cross-sectional shape of the facing surface 31 of the inner end portion 21 in the direction orthogonal to the axial direction of the core 10 is a crank shape having two bends. The facing surface 31 is continuous with the outer peripheral surface 10a of the core 10 and is continuous with the first facing surface 31a intersecting the circumferential direction of the core 10 and the first facing surface 31a. And a second facing surface 31b along the direction. Further, the facing surface 31 has a third facing surface 31 c that is continuous with the second facing surface 31 b and the inner peripheral surface 10 b of the core 10 and intersects the circumferential direction of the core 10.

  The first facing surface 31a is inclined with respect to the radial direction of the core 10, and the angle θ1 formed by the first facing surface 31a and the second facing surface 31b is greater than 90 °. Further, an angle θ2 formed by the second facing surface 31b and the third facing surface 31c is also larger than 90 ° and is the same as the angle θ1.

  Similarly, the cross-sectional shape of the facing surface 32 of the outer end 22 in the direction orthogonal to the axial direction of the core 10 is a crank shape having two bends. The facing surface 32 is continuous with the outer peripheral surface 10a of the core 10 and is continuous with the first facing surface 32a intersecting with the circumferential direction of the core 10 and the first facing surface 32a. A second opposing surface 32b along the direction, and a third opposing surface 32c that is continuous with the second opposing surface 32b and the inner peripheral surface 10b of the core 10 and intersects the circumferential direction of the core 10. The first opposing surfaces 31a, 32a and the third opposing surfaces 31c, 32c are opposed to each other in the circumferential direction of the core 10, and the second opposing surfaces 31b, 32b are the diameter of the core 10. Opposite direction.

  The first opposing surface 32a at the outer end 22 is inclined with respect to the radial direction of the core 10, and the angle η1 between the first opposing surface 32a and the second opposing surface 32b is greater than 90 °, It is the same as the angle θ1 of the end portion 21. In addition, an angle η2 formed by the second facing surface 32b and the third facing surface 32c at the outer end 22 is larger than 90 ° and is the same as the angle θ2 of the inner end 21.

  In an initial state in which the core 10 is not elastically deformed, the second opposing surfaces 31b and 32b of the both end portions 21 and 22 are spaced apart from each other in the radial direction of the core 10, and both The distance L1 between the two opposing surfaces 31b and 32b is the same as or slightly longer than the thickness of the sheet S to be wound, and the sheet S can be inserted between the pair of second opposing surfaces 31b and 32b. The first facing surfaces 31a and 32a are also spaced apart, and the sheet S can be inserted between the first facing surfaces 31a and 32a.

  As the sheet S to be wound up, for example, a positive electrode, a negative electrode, a separator, and the like used for a secondary battery as a power storage device are conceivable. The positive electrode and the negative electrode have an active material layer on a metal foil. In addition, it is not restricted to these, For example, metal foil without an active material layer, paper, a textile fabric etc. may be sufficient.

Next, a method for holding the sheet S using the winding core 10 will be described together with its operation.
First, as shown in FIG. 3A, the core 10 is arranged so that the inner peripheral surface 10 b of the core 10 and the outer peripheral surface 101 a of the shaft 101 face each other. At this stage, the claw portion 102 is in the immersion position. Then, the end portion of the sheet S is inserted between the pair of end portions 21 and 22. At this time, as shown in FIG. 3B, the sheet S is moved to a position where the end portion of the sheet S is disposed between the pair of second facing surfaces 31b and 32b facing in the radial direction of the core 10. insert.

  Thereafter, as shown in FIGS. 4A and 4B, air is supplied into the shaft 101 to move the claw portion 102 to the protruding position, and the core 10 is fixed to the shaft 101. In this case, the core 10 is elastically deformed and expands. Specifically, the inner diameter Rb of the core 10 after elastic deformation is larger than the inner diameter Ra of the core 10 in the initial state. And as shown in FIG.4 (b), the inner side edge part 21 is pressed by the nail | claw part 102 among a pair of edge parts 21 and 22, and is elastically deformed toward the outer side. For this reason, the distance L2 between the two opposing surfaces 31b and 32b after elastic deformation is shorter than the distance L1 between the two opposing surfaces 31b and 32b in the initial state, and as a result, the sheet S becomes a pair of end portions. The sheet S is held between the winding cores 10 and 21 and 22. Then, the sheet S is wound up by rotating the shaft 101.

  When the winding of the sheet S is completed, the air is discharged, the claw portion 102 is moved to the immersion position, and the fixing of the shaft 101 and the core 10 is released. In this case, the core 10 returns to the initial state where it is not elastically deformed, and the holding of the sheet S by the pair of end portions 21 and 22 is released. Then, as shown in FIG. 5, the wound body of the wound sheet S is slid in the axial direction of the core 10 to separate the wound body of the sheet S from the core 10.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) The pair of end portions 21 and 22 in the circumferential direction of the core 10 in the core 10 are opposed to the radial direction of the core 10. Accordingly, with the sheet S inserted between the pair of end portions 21 and 22, the core 10 is elastically deformed or returned to the original state, thereby holding the sheet S with a relatively simple configuration. The sheet S can be easily removed.

  (2) The sheet holding method using the core 10 includes a step of arranging the core 10 at a position where the inner peripheral surface 10b of the core 10 faces the outer peripheral surface 101a of the shaft 101, and a pair of end portions 21, 22 to insert the sheet S between. Further, in the sheet holding method, the shaft 101 and the core 10 are fixed by pressing the core 10 from the inner side to the outer side with the nail portions 102 that can be projected and retracted on the outer peripheral surface 101a of the shaft 101. A step of sandwiching the sheet S between the end portions 21 and 22. Thereby, since the sheet S is clamped by the pair of end portions 21 and 22 as the shaft 101 and the core 10 are fixed, the sheet S can be easily clamped by the pair of end portions 21 and 22. Can do.

  (3) The opposing surfaces 31 and 32 of the pair of end portions 21 and 22 are continuous with the outer peripheral surface 10a of the core 10, and the first opposing surfaces 31a and 32a intersecting the circumferential direction of the core 10 and the first It has 2nd opposing surface 31b, 32b which follows the opposing surfaces 31a and 32a and follows the circumferential direction of the core 10. As shown in FIG. Further, the pair of facing surfaces 31 and 32 have third facing surfaces 31 c and 32 c that are continuous with the second facing surfaces 31 b and 32 b and the inner peripheral surface 10 b of the core 10 and intersect the circumferential direction of the core 10. . Accordingly, the second facing surfaces 31 b and 32 b of the pair of end portions 21 and 22 face each other in the radial direction of the core 10. Therefore, the sheet S can be favorably held by the pair of end portions 21 and 22.

  (4) The angle θ1 formed by the first opposing surface 31a and the second opposing surface 31b at the inner end portion 21 is larger than 90 °, and the first opposing surface 32a and the second opposing surface 32b at the outer end portion 22 are set. The angle η1 formed by is made larger than 90 °. Accordingly, the sheet S can be inserted between the pair of end portions 21 and 22 relatively smoothly.

In addition, you may change the said embodiment as follows.
In the embodiment, the angle θ1 formed by the first facing surface 31a and the second facing surface 31b at the inner end 21 and the angle η1 formed by the first facing surface 32a and the second facing surface 32b at the outer end 22 Are the same, but are not limited thereto, and may be different within a range larger than 90 °.

  As shown in FIG. 6, an end portion 41 having an angle θ11 formed by the first facing surface 41a and the second facing surface 41b may be 90 °, and the first facing surface 42a and the second facing surface 42b The edge 42 formed by the angle η11 may be 90 °. The angle formed between the first facing surface and the second facing surface may be smaller than 90 °.

  As shown in FIG. 7, there are end portions 51 and 52 having opposing surfaces 51 a and 52 a that are continuous with both the outer peripheral surface 10 a and the inner peripheral surface 10 b of the core 10 and are inclined with respect to the radial direction of the core 10. May be.

  In the embodiment, the pair of end portions 21 and 22 are separated from each other in the radial direction of the core 10, but the present invention is not limited thereto, and may be in contact with each other. In this case, the sheet S may be inserted by elastically deforming the outer end 22 of the pair of end portions 21 and 22 toward the outside. In short, as long as the pair of ends in the circumferential direction of the core are opposed to each other in the radial direction of the core, they may contact or be separated in the initial state.

  As shown in FIG. 8, the core 60 has a pair of end portions 61, 62 in the circumferential direction of the core 60, and one end portion 61 is a radially inner side of the other end portion 62. The structure arrange | positioned may be sufficient. In this case, the pair of end portions 61 and 62 may be separated in the radial direction of the core 60 or may be in contact with each other in the initial state.

  In the embodiment, the claw portion 102 is disposed at a position that directly presses the inner end portion 21, but is not limited thereto, and the claw portion 102 and the inner end portion 21 in the circumferential direction of the core 10 The relative positional relationship of is arbitrary. Even if the claw portion 102 is not disposed at a position where it directly presses, the sheet S is sandwiched between the pair of end portions 21 and 22 due to the expansion of the core 10.

  The winding core 10 is hard enough to be fixed to the shaft 101 by the pressing of the claw portion 102 and soft enough to elastically deform the pair of end portions 21 and 22 to hold the sheet S by the pressing of the claw portion 102. The specific material is arbitrary.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) A sheet holding and having a cylindrical shape having a pair of end portions in the circumferential direction and elastically deformable, wherein the pair of end portions are arranged in an axial direction of the core. A winding core characterized in that the winding core faces the radial direction of the winding core. When attention is paid to this technical idea, the core may have a cylindrical shape in which a plate-like member is wound in a state in which a winding start portion and a winding end portion face each other in the radial direction. In this case, the winding start portion and the winding end portion correspond to the pair of end portions.

  DESCRIPTION OF SYMBOLS 10 ... Core, 10a ... Outer peripheral surface of a core, 10b ... Inner peripheral surface of a core, 21, 22 ... End in the circumferential direction, 31, 32 ... Opposing surface, 31a, 32a ... First opposing surface, 31b , 32b, second opposing surface, 31c, 32c, third opposing surface, 101, shaft, 102, claw portion.

Claims (4)

In the core that holds the sheet,
The core is an elastically deformable cylindrical shape with a cut along the axial direction,
A pair of ends in the circumferential direction of the core is opposed to the radial direction of the core. The pair of end portions have a pair of opposed surfaces facing each other,
Each of the pair of opposed surfaces is
A first opposing surface that is continuous with the outer peripheral surface of the core and intersects the circumferential direction of the core;
A second opposing surface that is continuous with the first opposing surface and extends along a circumferential direction of the core;
A third opposing surface that is continuous with the second opposing surface and the inner peripheral surface of the core and intersects the circumferential direction of the core;
The core according to claim 1 having The first facing surface is inclined with respect to the radial direction of the core,
The core according to claim 2, wherein an angle formed by the first facing surface and the second facing surface is larger than 90 °. In the holding method of the sheet | seat using the core as described in any one of Claims 1-3,
Arranging the core at a position where the inner peripheral surface of the core faces the outer peripheral surface of a cylindrical shaft;
Inserting the sheet between the pair of ends,
A step of fixing the shaft and the core by pressing the core from the inner side to the outer side with a claw portion present on the outer peripheral surface of the shaft, and sandwiching the sheet between the pair of end portions When,
A sheet holding method characterized by comprising: