JP6804422B2 - Winding device - Google Patents

Description

The present invention relates to, for example, a winding device for obtaining a winding element built in a secondary battery or the like.

For example, a winding element used in a secondary battery such as a lithium ion battery is a separator sheet in which a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material are made of an insulating material. It is manufactured by winding it in a state of being overlapped with each other.

In a winding device for manufacturing a winding element, both electrode sheets and separator sheets supplied from the raw fabric wound in a roll shape are conveyed to the winding core along separate transfer paths. ing. Further, the winding device includes a cutting means for cutting the electrode sheet arranged corresponding to each of the transfer paths of each electrode sheet, and an electrode arranged upstream of the cutting means along the transfer path. It is provided with a sheet supply means capable of gripping the sheet. The cutting means includes two blades arranged at positions sandwiching the transport path of the electrode sheet, and cuts the electrode sheet as the blades open and close. The sheet supply means includes two gripping portions arranged at positions sandwiching the transport path of the electrode sheet, and the gripping and releasing of the electrode sheet is switched by the opening / closing operation of these gripping portions. Further, the sheet supply means supplies the electrode sheet to the winding core side by moving closer to the winding core side while the electrode sheet is gripped by both gripping portions.

By the way, some defective parts (for example, seams between sheets) may be present on the electrode sheets. In this case, if the winding element contains the defective portion, the quality of the winding element may deteriorate.

Therefore, in order to wind up and remove the defective portion of the electrode sheet, a technique has been proposed in which a rotatable defective winding winding core is provided downstream of the sheet supply means and the cutting means along the transfer path of the electrode sheet. (See, for example, Patent Document 1 and the like). According to this technique, when a defective portion of the electrode sheet is detected, a part of the electrode sheet including the defective portion is wound by the defective winding core.

Japanese Unexamined Patent Publication No. 2011-233279

However, as the winding of the electrode sheet by the defective winding core progresses and the outer diameter of the wound electrode sheet gradually increases, the transport path of the electrode sheet with respect to the defective winding core gradually moves. It will be. If the electrode sheet to be transported comes into contact with the cutting means (blade portion) or the sheet supply means (grip portion) due to the movement of the transport path, an abnormality may occur in the cutting means or the sheet supply means, or the electrodes may be abnormal. There is a risk that the active material may scatter from the sheet.

Therefore, in order to prevent the electrode sheet from coming into contact with the cutting means and the sheet supplying means even when the transport path moves, the distance between the double-edged portions when the cutting means is opened is sufficient. It is conceivable that the distance between the gripping portions is sufficiently large when the seat supply means is opened.

However, in this case, since the amount of operation during the opening / closing operation of the cutting means and the sheet supplying means is large, it becomes necessary to secure a large space for arranging these means. As a result, the size of the device may be increased, which may lead to an increase in the cost of manufacturing the device. It should be noted that such a defect can also occur when a defective winding core or the like is provided on the separator sheet side and the defective portion of the separator sheet is wound and removed by the defective winding core.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a winding device capable of reducing the size of the device and suppressing an increase in cost.

Hereinafter, each means suitable for solving the above object will be described in terms of terms. In addition, the action and effect peculiar to the corresponding means will be added as necessary.

Means 1. A band-shaped electrode sheet having an active material on its surface and a band-shaped separator sheet made of an insulating material are supplied to a rotatably provided winding core, and the rotation of the winding core causes the electrode sheet and the separator sheet to rotate. It is a winding device that winds while stacking
The electrode sheet and at least one of the separator sheets are provided along the transport path of the target sheet, and are provided with two grip portions arranged at positions sandwiching the transport path of the target sheet. A sheet supply means capable of switching between gripping and releasing of the target sheet by an opening / closing operation and supplying the target sheet in a gripped state toward the winding core.
It is provided with two blades provided downstream of the sheet supply means along the transport path and arranged at positions sandwiching the transport path of the target sheet, and the target sheet is cut by opening and closing the blades. Cutting means and
A rod-shaped defective winding core provided downstream of the cutting means along the transport path and capable of winding a part of the target sheet including a defective portion by its own rotation.
Even if the outer diameter of the target sheet wound by the defective winding core fluctuates during winding of the target sheet by the defective winding core, at least the sheet supplying means and the cutting means are supported. A winding device including a path maintaining means for maintaining the transport path at a fixed position.

According to the above means 1, even if the outer diameter of the wound target sheet fluctuates during winding of the target sheet by the defective winding core, at least the sheet supplying means and the cutting means are supported by the path maintaining means. The transport path to be carried out can be maintained at a fixed position. Therefore, even if the distance between the two blades in the open state is small, it is possible to prevent the target sheet from coming into contact with the cutting means (blade), and the distance between the two grips in the open state can be prevented. Even if the size is small, it is possible to prevent the target sheet from coming into contact with the sheet supply means (grip portion). Therefore, it is possible to reduce the amount of movement during the opening / closing operation of the cutting means and the sheet supplying means while preventing the target sheet from coming into contact with the cutting means and the sheet supplying means. As a result, the space required for arranging these means can be reduced, and the device can be miniaturized. In addition, it is possible to suppress an increase in costs related to the manufacture of the device.

The phrase "maintaining the transport path at a fixed position" is not limited to the case where the transport path is maintained at a constant position in a strict sense during winding of the target sheet by the defective winding core. Including the case where the transport path is maintained within a substantially constant range during winding of the target sheet by the defective winding core.

Means 2. The path maintaining means is configured by a winding core moving means capable of moving the defective winding core along a direction orthogonal to the rotation axis when the target sheet is wound by the defective winding core. The winding device according to means 1, wherein the winding device is characterized by the above.

According to the above means 2, the defective winding core is moved by the winding core moving means in accordance with the fluctuation of the outer diameter of the target sheet, so that the transport path corresponding to the sheet supplying means and the cutting means is maintained at a fixed position. be able to. Therefore, the transport path can be maintained at a fixed position without providing another mechanism for contacting the target sheet. As a result, it is possible to more reliably prevent the target sheet from being meandered due to contact between the target sheet to be conveyed and another mechanism, and an abnormality in winding the target sheet. Further, when the target sheet is an electrode sheet, it is possible to prevent the active material from scattering from the electrode sheet due to contact with another mechanism. In addition, it is not necessary to provide a space for installing another mechanism, and it is possible to further reduce the size of the device and suppress the increase in cost.

Means 3. A thickness detecting means for detecting at least the thickness of a portion of the target sheet wound around the defective winding core, and
A length detecting means for detecting at least the length of a portion of the target sheet wound around the defective winding core, and
The winding device according to the means 2, further comprising a movement control means for controlling the winding core moving means based on the respective detection results of the thickness detecting means and the length detecting means.

According to the above means 3, the winding core moving means is controlled based on the detection result regarding at least the thickness and length of the portion of the target sheet wound around the defective winding core. Therefore, the movement of the defective winding core can be controlled more appropriately according to the state of the target sheet actually wound by the defective winding core, and the transfer path is more reliably maintained at a fixed position. be able to. Therefore, the distance between the double-edged portions in the open state can be made smaller, and the distance between the two grip portions in the open state can be made smaller. As a result, the amount of operation during the opening / closing operation of the cutting means and the sheet supplying means can be made smaller, and the arrangement space related to the cutting means and the sheet supplying means can be reduced more effectively. As a result, it is possible to further suppress the increase in cost related to the miniaturization of the device and the manufacture of the device.

Means 4. The defective winding core is configured to be movable between a winding position that overlaps the transport path and a retracted position that deviates from the transport path along its own rotation axis direction.
A support means for supporting the tip of the defective winding core when the defective winding core is arranged at the winding position and the target sheet is wound.
After the target sheet is wound by the defective winding core, it comes into contact with the wound target sheet, and in this state, the defective winding core moves from the winding position to the retracted position. The target sheet that has been wound up while being caught by itself is provided with a removing means that can be removed from the defective winding core.
The winding core moving means is any one of means 2 or 3 characterized in that the supporting means and the removing means are configured to move in the same movement mode as the defective winding core. The winding device described.

According to the means 4, the defective winding core can be moved between the winding position overlapping the transport path of the target sheet and the evacuation position deviating from the transport path. Therefore, by arranging the defective winding core in the retracted position, the defective winding core adversely affects the target sheet at times other than when winding the defective portion of the target sheet, such as when manufacturing the winding element. It can be prevented from being evacuated.

Further, according to the above means 4, when the target sheet is wound by the defective winding core, the tip portion of the defective winding core is supported by the supporting means that moves in the same manner as the defective winding core. Can be done. Therefore, the defective winding core can be supported more stably by the supporting means during the winding of the target sheet, and the defective winding core can be more reliably prevented from being deformed such as bending. .. As a result, the target sheet can be wound in a more appropriate state.

In addition, since the removing means moves in the same manner as the defective winding core, even if the moving amount of the defective winding core fluctuates depending on the thickness and length of the target sheet to be wound, the winding is wound. When the removal is completed, the relative positional relationship between the defective winding core and the removing means can always be kept constant. Therefore, the defective winding core can be returned to the original position along the direction orthogonal to the rotation axis (the position before the movement by the winding core moving means), or the defective winding core can be returned to the original position along the direction orthogonal to the rotation axis. By moving the defective winding core from the winding position to the retracted position without adjusting the position of the core, the target sheet wound from the defective winding core can be removed by the removing means. Can be done. Further, before returning the defective winding core to the original position (the position before moving by the winding core moving means), the defective winding core can be moved to a retracted position off the transport path. Therefore, the production of the winding element can be restarted before the defective winding core is returned to the original position, and the productivity can be improved.

Further, according to the above means 4, the supporting means and the removing means can be moved by the winding core moving means in the same manner as the moving mode of the defective winding core. Therefore, it is not necessary to provide a means for moving the supporting means and the removing means separately from the winding core moving means, and it is possible to more effectively reduce the size of the device and suppress the increase in cost.

Means 5. The winding device according to any one of means 2 to 4, wherein the defective winding core has a circular outer peripheral surface in a cross section orthogonal to its own rotation axis.

According to the above means 5, it is possible to make it difficult for the transport path to fluctuate due to the rotation angle of the defective winding core. Therefore, it is possible to easily control the movement of the defective winding core by the winding core moving means. The means 5 may be applied to the following means 6 or 7.

Means 6. The winding device according to means 1, wherein the path maintaining means is composed of a rotatable path changing roller that comes into contact with the target sheet upstream of the defective winding core.

According to the above means 6, the route maintaining means is composed of a path changing roller. Therefore, the route maintenance means can be realized by a simple configuration, and the increase in the cost related to the manufacture of the apparatus can be suppressed more reliably.

Means 7. The winding device according to means 6, wherein the path changing roller is provided at a position where the target sheet comes into contact with the target sheet only when the target sheet is wound by the defective winding core.

According to the above means 7, the path changing roller is provided at a position where it comes into contact with the target sheet only when the target sheet is wound by the defective winding core. Therefore, it is possible to prevent the target sheet from coming into contact with the path changing roller when the target sheet is not wound by a defective winding core, such as during manufacturing of a winding element. As a result, it is possible to more reliably prevent problems caused by contact between the target sheet and the path changing roller (for example, meandering of the target sheet, scattering of the active material when the target sheet is an electrode sheet, etc.).

It is sectional drawing which shows the structure of a battery element. It is a schematic block diagram of a winding part. It is a schematic block diagram of a winding device. It is a perspective schematic view of the defective winding mechanism when viewed from the upstream side of the transport path of an electrode sheet. It is a perspective schematic view of the defective winding mechanism when viewed from the downstream side of the transport path of an electrode sheet. It is a block diagram which shows the electric structure of a control device and the like. It is a flowchart of a defect detection process. It is a flowchart of a defective take-up process. It is a flowchart of the winding pre-processing. It is a flowchart of the process during winding. It is a flowchart of the process at the start of winding. It is a flowchart of a defect identification processing. It is a flowchart of a defect unidentified process. It is a flowchart of the processing at the end of winding. It is a perspective schematic view of the defective winding mechanism in the state which the defective winding winding core is arranged at the position at the time of winding. It is sectional drawing of the defective winding mechanism at the time of arranging an electrode sheet in a slit. It is sectional drawing for demonstrating the movement of a defective winding core, etc. in the process at the start of winding. It is sectional drawing for demonstrating the movement of a defective winding core, etc. in the process at the start of winding. It is sectional drawing which shows the movement of a defective winding core, etc. in the process during winding. It is sectional drawing which shows the movement of a defective winding core, etc. in the process during winding. It is a perspective schematic view of the defective winding mechanism at the time of removing a defective sheet roll. It is sectional drawing of the defective winding mechanism which shows the path change roller in another embodiment. In another embodiment, it is a cross-sectional schematic diagram of a defective winding mechanism when winding an electrode sheet. In another embodiment, it is a cross-sectional schematic view of a defective winding mechanism in which a part of a cover portion is composed of a path changing roller.

Hereinafter, embodiments will be described with reference to the drawings.
[First Embodiment]
First, the configuration of the lithium ion battery element as the winding element obtained by the winding device will be described.

As shown in FIG. 1, in the lithium ion battery element 1 (hereinafter, simply referred to as “battery element 1”), a positive electrode sheet 4 and a negative electrode sheet 5 are superposed on each other via two separator sheets 2 and 3. Manufactured by winding in a state. In addition, instead of the two separator sheets 2 and 3, one folded separator sheet may be used. Further, in the following, for convenience of explanation, the separator sheets 2 and 3 and the electrode sheets 4 and 5 may be referred to as "various sheets 2 to 5".

The separator sheets 2 and 3 each have a strip shape having the same width, and an insulator such as polypropylene (PP) is used to prevent different electrode sheets 4 and 5 from coming into contact with each other and causing a short circuit. It is composed of.

The electrode sheets 4 and 5 are made of a thin metal sheet and have substantially the same width as the separator sheets 2 and 3. In addition, active material is applied to both the front and back surfaces of the electrode sheets 4 and 5. For example, an aluminum foil sheet is used for the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles or the like) is coated on both the front and back surfaces thereof. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon or the like) is coated on both the front and back surfaces thereof. Then, ion exchange between the positive electrode sheet 4 and the negative electrode sheet 5 can be performed via the active material. More specifically, during charging, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5, and during discharging, ions move from the negative electrode sheet 5 side to the positive electrode sheet 4.

In addition, in the present embodiment, the lengths of the both electrode sheets 4 and 5 constituting one battery element 1 are set to predetermined values set in advance. In the present embodiment, the length of the negative electrode sheet 5 for one element is slightly larger than the length of the positive electrode sheet 4 for one element so that the negative electrode sheet 5 covers the positive electrode sheet 4 more reliably. Has been done.

Further, a plurality of positive electrode leads (not shown) extend from one end edge in the width direction of the positive electrode sheet 4, and a plurality of negative electrode leads (not shown) extend from the other end edge in the width direction of the negative electrode sheet 5.

When obtaining a lithium ion battery, the battery element 1 is arranged in a battery container (case) which is made of metal and has a tubular shape (not shown), and the positive electrode lead and the negative electrode lead are put together. Then, the combined positive electrode leads are connected to the positive electrode terminal component (not shown), the similarly grouped negative electrode leads are connected to the negative electrode terminal component (not shown), and both terminal components are opened at both ends of the battery container. A lithium ion battery can be obtained by providing the battery so as to block the battery.

Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 10 includes a winding portion 11 for winding various sheets 2 to 5, and a positive electrode sheet supply mechanism 31 for supplying the positive electrode sheet 4 to the winding portion 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding portion 11, separator supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding portion 11, and a control device. It is equipped with 81. The various mechanisms in the winding device 10, such as the winding section 11 and the supply mechanisms 31, 41, 51, 61, are configured to be operated and controlled by the control device 81.

The positive electrode sheet supply mechanism 31 includes a positive electrode sheet original fabric 32 in which the positive electrode sheet 4 is wound in a roll shape. The positive electrode sheet original fabric 32 is supported so as to be freely rotatable, from which the positive electrode sheet 4 is appropriately pulled out. Further, in this example, the positive electrode sheet 4 constituting the positive electrode sheet original fabric 32 is provided with a defective start marker M1 and a defective end marker M2 in advance corresponding to defective portions such as seams. The defective start marker M1 indicates the start end (uppermost stream portion) of the defective portion, and the defective end marker M2 indicates the end (most downstream portion) of the defective portion. In the present embodiment, the distance from the defective start marker M1 to the defective end marker M2 in the positive electrode sheet 4 is set to be less than the length of the positive electrode sheet 4 for one element.

The thickness of the positive electrode sheet 4 constituting the positive electrode sheet raw fabric 32 may differ from lot to lot of the positive electrode sheet raw fabric 32 due to reasons such as a difference in the coating thickness of the active material. Further, the thickness of each part of the positive electrode sheet 4 constituting the positive electrode sheet original fabric 32 of 1 may be different. These points are the same in the negative electrode sheet 5.

The positive electrode sheet supply mechanism 31 includes a sheet supply mechanism 71 as a sheet supply means, an electrode cutter 72 as a cutting means, a tension applying mechanism 73, a thickness measurement mechanism 74, a defect winding mechanism 91, and a defect detection. It is equipped with a sensor 76.

The sheet supply mechanism 71 supplies the positive electrode sheet 4 to the winding portion 11, and is separated from the winding portion 11 at an approaching position approaching the winding portion 11 along the transport path of the positive electrode sheet 4. It is configured to be movable to the separated position. The sheet supply mechanism 71 is arranged at a position sandwiching the transport path of the positive electrode sheet 4, and includes two gripping portions 71a and 71b capable of gripping the positive electrode sheet 4. The grip portions 71a and 71b are configured to be openable and closable by a driving means (not shown), and the grip and release of the positive electrode sheet 4 can be switched by the open and close operation of the grip portions 71a and 71b. Then, while the positive electrode sheet 4 is gripped by the gripping portions 71a and 71b, the sheet supply mechanism 71 approaches the winding portion 11, so that the positive electrode sheet 4 is brought into contact with the winding portion 11, which will be described later. It can be supplied to 14 people.

Further, in the present embodiment, the seat supply mechanism 71 is configured so that the distance between the grip portions 71a and 71b when the seat supply mechanism 71 is opened is sufficiently small. As a result, the amount of movement of the grip portions 71a and 71b during the opening / closing operation is sufficiently small.

The electrode cutter 72 is for cutting the positive electrode sheet 4, and includes two blade portions 72a and 72b arranged at positions sandwiching the transport path of the positive electrode sheet 4. The blade portions 72a and 72b are configured to be openable and closable by a driving means (not shown), and have a sheet cutting position located so as to sandwich the positive electrode sheet 4 and a retracted position separated from the transport path of the positive electrode sheet 4. It is said that it can be moved between. The positive electrode sheet 4 is cut while the positive electrode sheet 4 is gripped by the gripping portions 71a and 71b.

Further, in the present embodiment, the electrode cutter 72 is configured so that the distance between the blade portions 72a and 72b is sufficiently small when the electrode cutter 72 is opened. As a result, the amount of movement of the blades 72a and 72b during the opening / closing operation is sufficiently small.

The tension applying mechanism 73 has a pair of rollers 73a and 73b, and a dancer roller 73c oscillating between the rollers 73a and 73b. The dancer roller 73c is operated by a torque-controlled predetermined servomotor (not shown), and the servomotor is controlled by the control device 81 so that the tension applied to the positive electrode sheet 4 can be changed. ing. In addition, the dancer roller 73c also plays a role of preventing the positive electrode sheet 4 from loosening by applying tension to the positive electrode sheet 4. In the present embodiment, the tension applying mechanism 73 always applies a constant tension to the positive electrode sheet 4.

The thickness measuring mechanism 74 includes a pair of rollers 74a and 74b, a first length measuring roller 74c, and a second length measuring roller 74d. A positive electrode sheet 4 located between the rollers 74a and 74b is hung on the outer circumference of the first length measuring roller 74c in a folded state. The second length measuring roller 74d is arranged so as to sandwich the folded portion of the positive electrode sheet 4 with the first length measuring roller 74c.

Further, both length measuring rollers 74c and 74d are driven rollers having the same diameter and freely rotating, respectively, and rotate as the positive electrode sheet 4 is conveyed. The rotation amount of the first length measuring roller 74c can be grasped by the predetermined first encoder 77a, and the rotation amount of the second length measuring roller 74d can be grasped by the predetermined second encoder 77b. (See Fig. 6). Information regarding the amount of rotation of both length measuring rollers 74c and 74d is output from both encoders 77a and 77b to the control device 81.

In addition, the rotation amount of the roller 74b can be grasped by a predetermined third encoder 77c (see FIG. 6), and information on the rotation amount of the roller 74b is output from the third encoder 77c to the control device 81. ..

Since the positional relationship between the length measuring rollers 74c and 74d and the positive electrode sheet 4 is set as described above, when the positive electrode sheet 4 passes between the length measuring rollers 74c and 74d, the positive electrode sheet 4 is positive. The amount of rotation of the first length measuring roller 74c in contact with the inner peripheral surface (bending inner surface) of the electrode sheet 4 and the amount of rotation of the second length measuring roller 74d in contact with the outer peripheral surface (bending outer surface) of the positive electrode sheet 4. Will make a difference. The difference in the amount of rotation is larger as the positive electrode sheet 4 is thicker, and becomes smaller as the positive electrode sheet 4 is thinner.

The defective winding mechanism 91 is a mechanism for winding and removing a part of the positive electrode sheet 4 including the defective portion. The defective winding mechanism 91 is provided downstream of the electrode cutter 72 along the transport path of the positive electrode sheet 4. The configuration of the defective winding mechanism 91 will be described later.

The defect detection sensor 76 is composed of a predetermined photoelectric sensor or the like, and is for detecting the defect start marker M1 and the defect end marker M2. When the defect detection sensor 76 detects the defective start marker M1 or the defective end marker M2, the defect detection sensor 76 transmits a signal to the control device 81 to the effect that the defective start marker M1 or the defective end marker M2 has been detected. In the present embodiment, the distance from the electrode cutter 72 to the defect detection sensor 76 along the transport path of the positive electrode sheet 4 is configured to be the same as the length of the positive electrode sheet 4 for one element. ..

The negative electrode sheet supply mechanism 41 includes a negative electrode sheet original fabric 42 in which the negative electrode sheet 5 is wound in a roll shape on the most upstream side thereof. The negative electrode sheet original fabric 42 is supported so as to be freely rotatable, from which the negative electrode sheet 5 is appropriately pulled out. Further, the negative electrode sheet 5 constituting the negative electrode sheet original fabric 42 is provided with a defective start marker M1 and a defective end marker M2 in advance corresponding to defective portions such as seams, similarly to the positive electrode sheet 4. .. In the present embodiment, the distance from the defective start marker M1 to the defective end marker M2 in the negative electrode sheet 5 is set to be less than the length of the negative electrode sheet 5 for one element.

Further, in the middle of the transport path of the negative electrode sheet 5 from the negative electrode sheet original fabric 42 to the winding portion 11, the sheet supply mechanism 71, the electrode cutter 72, and the tension applying mechanism are formed in the same manner as the transport path of the positive electrode sheet 4. 73, a thickness measuring mechanism 74, a defective winding mechanism 91, a defective detecting sensor 76, and the like are provided. Since these have basically the same configurations as those provided in the transport path of the positive electrode sheet 4 except that they function for the negative electrode sheet 5, detailed description of these will be omitted. In the present embodiment, the distance from the electrode cutter 72 to the defect detection sensor 76 along the transport path of the negative electrode sheet 5 is configured to be the same as the length of the negative electrode sheet 5 for one element. ..

On the other hand, the separator supply mechanisms 51 and 61 include separator raw fabrics 52 and 62 in which the separator sheets 2 and 3 are wound in a roll shape, respectively. The separator raw fabrics 52 and 62 are supported so as to be freely rotatable, and the separator sheets 2 and 3 are appropriately pulled out from the separator sheets 2 and 62.

Further, the separator supply mechanisms 51 and 61 are provided with a tension applying mechanism 73, similarly to the electrode sheet supply mechanisms 31 and 41. This is the same as that provided in the positive electrode sheet supply mechanism 31 except that the separator sheets 2 and 3 function as targets. Therefore, a detailed description of this will be omitted.

Further, in the middle of the transport path of the various sheets 2 to 5, various guide rollers (reference numerals omitted) for guiding the various sheets 2 to 5 such as a pair of guide rollers 78a and 78b for grouping the various sheets 2 to 5 together. Is provided.

Next, the configuration of the winding portion 11 will be described. As shown in FIG. 2, the winding portion 11 has a turret 12 composed of two disc-shaped tables facing each other rotatably provided by a drive mechanism (not shown) and 180 ° intervals in the rotation direction of the turret 12. The two winding cores 13 and 14 provided in the above, the two support rollers 15a and 15b provided at positions shifted by approximately 90 ° in the rotational direction of the turret 12 with respect to the winding cores 13 and 14, and the separator cutter. A presser roller 17 for pressing various sheets 2 to 5 immediately before the end of winding, and a tape affixing mechanism 18 for affixing a predetermined fixing tape are provided.

The winding cores 13 and 14 are for winding various sheets 2 to 5 on their outer peripheral sides, respectively, and are configured to be rotatable around their own central axis by a drive mechanism (not shown). The amount of rotation of the winding cores 13 and 14 can be grasped by an encoder (not shown), and information on the amount of rotation is input from the encoder to the control device 81.

Further, the winding cores 13 and 14 are provided so as to appear and disappear with respect to one of the tables constituting the turret 12 along the axial direction of the turret 12 (the depth direction of the paper surface in FIG. 2). When the winding cores 13 and 14 are in a state of protruding from one of the tables, the tip portion thereof is inserted into a receiving hole formed in the other table and is rotatable by both tables. It has come to be supported.

Further, the winding core 13 (14) includes a pair of core pieces 13a, 13b (14a, 14b) extending along their own axial directions (paper surface depth direction in FIG. 2). A gap 13c (14c) is formed between the core pieces 13a and 13b (14a, 14b).

In addition, the winding cores 13 and 14 are configured to be rotatable between the winding position P1 and the removal position P2 by rotating the turret 12.

The winding position P1 is a position for winding various sheets 2 to 5 around the winding cores 13 and 14, and various sheets 2 to 5 are wound from the above-mentioned supply mechanisms 31, 41, 51 and 61 with respect to the winding position P1. Will be supplied.

The removal position P2 is a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. A removal device (not shown) for removing the battery element 1 from the winding cores 13 and 14 is provided in the peripheral portion of the removal position P2.

The support rollers 15a and 15b are for hooking and supporting various sheets 2 to 5 between the winding cores 13 and 14 moved to the removal position P2 and the supply mechanisms 31, 41, 51 and 61.

The separator cutter 16 is arranged in the vicinity of the winding position P1 and is located at a cutting position where the separator sheets 2 and 3 are cut by approaching the turret 12 and a retracting position which is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is movable to and from the position.

The presser roller 17 is arranged in the vicinity of the removal position P2, and has a proximity position where the presser roller 17 approaches the turret 12 and presses various sheets 2 to 5, and a retract position which is separated from the turret 12 and does not hinder the movement of the winding cores 13 and 14. It is configured to be movable between.

The tape affixing mechanism 18 is arranged in the vicinity of the removal position P2, and has a function of approaching the turret 12 at the end of winding and affixing a predetermined fixing tape to the end portions of the separator sheets 2 and 3. ..

Next, the configuration of the defective winding mechanism 91 will be described. The defective winding mechanism 91 is for winding at least a portion of the electrode sheets 4 and 5 from the defective start marker M1 to the defective end marker M2, that is, a portion of the electrode sheets 4 and 5 including the defective portion. In the present embodiment, the positive electrode sheet 4 and the negative electrode sheet 5 correspond to the target sheets. The defective winding mechanism 91 is provided corresponding to each of the transport paths of the two electrode sheets 4 and 5, but in the following, the defective winding mechanism 91 is provided corresponding to the transport path of the positive electrode sheet 4. The mechanism 91 will be described. The defective winding mechanism 91 provided corresponding to the transport path of the negative electrode sheet 5 functions as a target for the negative electrode sheet 5, but the defective winding mechanism 91 provided corresponding to the transport path of the positive electrode sheet 4 is provided. It has the same configuration as the taking mechanism 91.

As shown in FIGS. 4 and 5, the defective winding mechanism 91 includes a winding core unit 92, a winding core supporting portion 93 as a supporting means, a removing mechanism 94 as a removing means, and a base portion to which these are fixed. It is provided with 95, a path maintaining means for moving the winding core unit 92 and the like by moving the base portion 95, and a moving mechanism 96 as a winding core moving means.

The winding core unit 92 includes a shaft portion 921, a circular base portion 922, a cover portion 923, a defective winding core 924, and a drive portion 925.

The shaft portion 921 has a cylindrical shape, and is supported by a drive unit 925 in a state where it can reciprocate along its own axial direction. However, the shaft portion 921 cannot rotate relative to the drive unit 925.

The circular base 922 has a disk shape and is attached to the tip of the shaft 921. Further, the circular base portion 922 is provided with a hole communicating with the inner peripheral space of the shaft portion 921 in the central portion thereof. The hole is a portion through which the defective winding core 924 is inserted.

The cover portion 923 is provided to prevent the active material from scattering when the positive electrode sheet 4 is wound by the defective winding core 924. The cover portion 923 projects from the outer periphery of the end surface of the circular base portion 922, and is provided around the defective winding core 924. Further, the cover portion 923 is composed of a pair of members forming an arc shape centered on the central axis of the defective winding winding core 924 in a cross section orthogonal to its own longitudinal direction.

The defective winding winding core 924 is for winding a part of the positive electrode sheet 4 including the defective portion. The defective winding core 924 is inserted through the hole provided in the central portion of the circular base portion 922 and the inner circumference of the shaft portion 921, and the drive unit 925 makes it possible to rotate around its own central axis as a rotation axis. Has been done. Further, the defective winding core 924 is made reciprocally movable along its own central axis direction by the drive unit 925. Further, the defective winding core 924 has a circular outer peripheral surface in a cross section orthogonal to its own rotation axis. That is, the defective winding core 924 has a circular cross section. In addition, the defective winding core 924 is provided with a slit 924s extending in the direction of its own rotation axis.

The drive unit 925 has a function of reciprocating the shaft portion 921 and the defective winding core 924 along their central axial directions, and a function of rotating the defective winding core 924. By moving the shaft portion 921 and the defective winding core 924 along the central axial direction by the drive unit 925, the shaft portion 921, the circular base portion 922, the cover portion 923, and the defective winding core 924 are moved forward. And it is possible to move back and forth integrally between the retracted positions. In a state where the shaft portion 921 or the like is arranged at the forward position, the defective winding winding core 924 is arranged at a position (referred to as a “winding position”) that overlaps with the transport path of the positive electrode sheet 4. On the other hand, in the state where the shaft portion 921 or the like is arranged at the retracted position, the defective winding core 924 is arranged at a position (referred to as “retracted position”) out of the transport path of the positive electrode sheet 4. That is, the defective winding core 924 is capable of reciprocating between the winding position and the retracting position along its own central axis direction.

The winding core support portion 93 supports the tip end portion of the defective winding core 924 arranged at the winding position. The winding core support portion 93 is provided at a position facing the defective winding core 924 along the central axis direction of the defective winding core 924, and has a cylindrical insertion portion 931 and the insertion portion. It is provided with a receiving pin 932 located at the center of 931. When the defective winding core 924 is arranged at the winding position, the tip of the defective winding core 924 is inserted into the inserted portion 931 and the receiving pin 932 is arranged in the slit portion 924s. , The tip of the defective winding core 924 is stably supported by the winding core support portion 93.

The removal mechanism 94 is for removing the positive electrode sheet 4 (defective sheet roll 4F, which will be described later) wound by the defective winding core 924 from the defective winding core 924. The removal mechanism 94 includes a drive block 941, a drive unit 942 capable of reciprocating the drive block 941 along the transport direction of the positive electrode sheet 4, and a plate-shaped removal claw portion 943 protruding from the drive block 941. It has. The thickness of the removal claw portion 943 is smaller than the width of the slit 924s, and by arranging the drive block 941 at a predetermined forward position by the drive portion 942, the removal claw portion 943 is moved to the slit 924s. Can be placed. On the other hand, by arranging the drive block 941 at a predetermined retracted position by the drive unit 942, the removal claw portion 943 can be separated from the defective winding winding core 924 by a predetermined distance or more.

The base portion 95 is for supporting the winding core unit 92, the winding core supporting portion 93, and the removing mechanism 94, and moving them in the same manner. The base portion 95 includes an insertion hole (not shown) formed through the base portion 95 in the vertical direction, and a nut 951 having a screw hole 951a is fixed to a portion of the base portion 95 where the insertion hole is formed. Has been done. A female screw (not shown) is formed in a portion of the nut 951 that forms the screw hole 951a. Further, the screw hole 951a of the nut 951 and the insertion hole are connected in series.

Further, the base portion 95 has a recess for accommodating the positive electrode sheet 4 wound by the defective winding core 924 at a position corresponding to the lower side of the defective winding core 924 arranged at the time of winding. It is provided with a defective sheet accommodating portion 952.

The moving mechanism 96 is a mechanism for moving the defective winding core 924, the winding core support portion 93, and the like by moving the base portion 95. The moving mechanism 96 includes a ball screw 961 screwed into the nut 951 and a motor 962 capable of rotating the ball screw 961. The motor 962 is composed of, for example, a servomotor, and its rotation amount and rotation speed are controlled by a movement control unit 85 described later of the control device 81. By rotating the ball screw 961 by the motor 962, the base portion 95 is oriented in a direction orthogonal to each of the rotation axis of the defective winding core 924 and the transport path of the positive electrode sheet 4 (vertical direction in this embodiment). Move along. By moving the base portion 95, the winding core unit 92, the winding core supporting portion 93, and the removing mechanism 94 fixed to the base portion 95 move along the vertical direction in the same movement mode. The moving mechanism 96 in this embodiment is just an example, and the configuration of the moving mechanism can be changed as appropriate.

Next, the control device 81 will be described. The control device 81 includes a CPU as a calculation means, a ROM for storing various programs, a RAM for temporarily storing various data such as calculation data and input / output data, and a hard disk for storing calculation data for a long period of time. As described above, the operation of the winding unit 11 and the supply mechanisms 31, 41, 51, 61 is controlled. As shown in FIG. 6, the control device 81 includes a length detecting unit 82 as a length detecting means, a thickness detecting unit 83 as a thickness detecting means, an average thickness calculating unit 84, and a movement control means. The movement control unit 85 of the above is provided.

The length detecting unit 82 acquires the feeding amount (supply amount) of the electrode sheets 4 and 5 with respect to the winding unit 11 side based on the information regarding the rotation amount of the roller 74b input from the third encoder 77c.

The thickness detection unit 83 detects the thickness of the electrode sheets 4 and 5 based on the information regarding the amount of rotation of both length measuring rollers 74c and 74d input from the first encoder 77a and the second encoder 77b. In the present embodiment, the thickness detecting unit 83 uses a preset table showing the relationship between the thickness of the electrode sheets 4 and 5 and the difference in the amount of rotation of both length measuring rollers 74c and 74d, and the electrode sheet 4 , 5 thickness is detected. Further, in the present embodiment, the thickness detecting unit 83 detects the thickness of the entire area of the electrode sheets 4 and 5 along the longitudinal direction thereof. Further, the thickness detecting unit 83 is an electrode sheet located downstream of both length measuring rollers 74c and 74d, based on the detected thickness and the information regarding the feeding amount of the electrode sheets 4 and 5 obtained by the length detecting unit 82. The thickness of each part of 4 and 5 is obtained, and the information on the thickness of each obtained part is stored in the RAM or the hard disk.

The average thickness calculation unit 84 is based on the feeding amount of the electrode sheets 4 and 5 obtained by the length detection unit 82 and the thickness of the electrode sheets 4 and 5 obtained by the thickness detection unit 83. Calculate the average thickness of 5.

The movement control unit 85 controls the operation of the movement mechanism 96 (motor 962) by using the average thickness obtained by the average thickness calculation unit 84.

Further, the control device 81 usually controls each of the supply mechanisms 31, 41, 51, 61 and the winding portion 11 based on the information stored in advance in the hard disk or the like, and winds the various sheets 2 to 5 into the winding cores 13, 14 The battery element 1 is manufactured by winding the battery element 1. However, when the defect detection flag described later is on, the control device 81 temporarily stops the manufacturing process of the battery element 1 and controls the operation of the defective winding mechanism 91 to perform the defective winding process. The defective winding process is a process of winding a part of the electrode sheets 4 and 5 including the defective portion by the defective winding mechanism 91 and removing the defective portion of the electrode sheets 4 and 5. The defective winding process will be described later.

Next, the operation of the winding device 10 when obtaining the battery element 1 will be described. It should be noted that the separator sheets 2 and 3 are wound by a predetermined amount on one of the winding cores 13 (14) arranged at the winding position P1.

First, the negative electrode sheet 5 is supplied to one of the winding cores 13 (14) by the sheet supply mechanism 71 of the negative electrode sheet supply mechanism 41. Specifically, the sheet supply mechanism 71 that grips the negative electrode sheet 5 approaches the winding portion 11 side, and the negative electrode sheet 5 is inserted between the separator sheets 2 and 3 to supply the negative electrode sheet 5. .. After the insertion, the negative electrode sheet 5 is released from being gripped by the sheet supply mechanism 71, and the sheet supply mechanism 71 is returned to its original position.

After the negative electrode sheet 5 is supplied, one winding core 13 (14) is rotated a predetermined number of times (for example, one rotation), and then the positive electrode is directed to the one winding core 13 (14) side by the sheet supply mechanism 71. The sheet 4 is supplied. Specifically, the sheet supply mechanism 71 that grips the positive electrode sheet 4 approaches the winding portion 11 side, and the positive electrode sheet 4 is inserted between the separator sheets 2 and 3 to supply the positive electrode sheet 4. .. After the insertion, the positive electrode sheet 4 is released from being gripped by the sheet supply mechanism 71, and the sheet supply mechanism 71 is returned to its original position.

Then, one winding core 13 (14) is rotated, and when the feeding amount of the positive electrode sheet 4 reaches a preset predetermined amount, the rotation of the one winding core 13 (14) is temporarily stopped. Then, the positive electrode sheet 4 is gripped by the sheet supply mechanism 71, and the positive electrode sheet 4 is cut by the electrode cutter 72. The feeding amount of the positive electrode sheet 4 is calculated based on the output information from the third encoder 77c in the positive electrode sheet supply mechanism 31. Further, the predetermined amount corresponds to the length of the positive electrode sheet 4 constituting one battery element. By winding the positive electrode sheet 4 around one of the winding cores 13 (14) by the predetermined amount, the end portion of the positive electrode sheet 4 for one element is arranged corresponding to the electrode cutter 72. ..

After that, the rotation of one winding core 13 (14) is restarted, and when the feeding amount of the negative electrode sheet 5 reaches a predetermined amount, the rotation of one winding core 13 (14) is temporarily stopped. Then, the negative electrode sheet 5 is gripped by the sheet supply mechanism 71, and the negative electrode sheet 5 is cut by the electrode cutter 72. The feeding amount of the negative electrode sheet 5 is calculated based on the output information from the third encoder 77c in the negative electrode sheet supply mechanism 41. Further, the predetermined amount corresponds to the length of the negative electrode sheet 5 constituting one battery element. When the negative electrode sheet 5 is wound around one of the winding cores 13 (14) by the predetermined amount, the end portion of the negative electrode sheet 5 for one element is arranged so as to correspond to the electrode cutter 72. ..

After cutting the negative electrode sheet 5, the end portion (remaining winding portion) of the electrode sheets 4 and 5 is wound up by restarting the rotation of one winding core 13 (14), and the separator sheets 2 and 3 are cut. Instead, the turret 12 is rotated. As a result, one winding core 13 (14) that was in the winding position P1 moves to the removal position P2 side while pulling out the separator sheets 2 and 3 from the separator supply mechanisms 51 and 61.

Then, when the rotation amount of one winding core 13 (14) reaches a preset predetermined amount, the rotation of one winding core 13 (14) is stopped. Further, due to the rotation of the turret 12, one winding core 13 (14) that was in the winding position P1 is removed and placed in the winding position P2, and the other winding core 14 (13) that was in the removing position P2 is placed in the winding position P1. Place in. At this time, the separator sheets 2 and 3 are hung on the one support roller 15b (15a) between the one winding core 13 (14) and the rollers 78a and 78b.

In this state, the pressing roller 17 is brought close to one of the winding cores 13 (14), the various sheets 2 to 5 are pressed by the pressing roller 17, and then the separator cutter 16 approaches the separator sheets 2 and 3. Cut the separator sheets 2 and 3 at once.

Prior to cutting the separator sheets 2 and 3, the other winding core 14 (13) protrudes from one table of the turret 12, so that the separator is formed in the gap 14c (13c) of the other winding core 14 (13). Place the sheets 2 and 3. Then, by rotating the other winding core 14 (13) by a predetermined amount, the separator sheets 2 and 3 are wound around the outer periphery thereof by a predetermined amount.

After cutting the separator sheets 2 and 3, one winding core 13 (14) is rotated while the various sheets 2 to 5 are being pressed by the pressing roller 17. As a result, the various sheets 2 to 5 are completely wound up. After that, the end portions of the separator sheets 2 and 3 are wound with the fixing tape by the tape sticking mechanism 18, and the battery element 1 wound by the removing device is removed from one of the winding cores 13 (14). Then, the battery element 1 is obtained.

In the manufacturing process of the battery element 1 as described above, the defect detection process is performed at the same time. In the defect detection process, various processes are performed at the time of detection while detecting the presence / absence of the defect start marker M1 and the defect end marker M2. Next, the defect detection process will be described. Although the defect detection process for the positive electrode sheet 4 will be described below, the same process is performed on the negative electrode sheet 5 side as well.

In the defect detection process, as shown in FIG. 7, first, in step S11, it is determined whether or not the positive electrode sheet 4 for one element is wound at the time of manufacturing the battery element 1. This determination is made based on the feeding amount of the positive electrode sheet 4 from the start of winding, which is obtained by the length detecting unit 82. If a negative determination is made in step S11, that is, if it is necessary to continue supplying the positive electrode sheet 4, the process proceeds to step S12.

In step S12, the defect detection sensor 76 determines whether or not the defect start marker M1 has been detected. If a negative determination is made in step S12, the process returns to step S11. On the other hand, if an affirmative determination is made in step S12, the process proceeds to step S13, the defect detection flag is turned on, and the process proceeds to step S14 in order to execute the defect winding process. The defect detection flag is identification information for determining whether or not to perform defect winding processing.

On the other hand, if an affirmative determination is made in step S11, that is, if the supply of the positive electrode sheet 4 for one element is completed without detecting the defect start end marker M1, the defect detection process is terminated. In this case, there is no defective portion in the positive electrode sheet 4 for one element located between the electrode cutter 72 and the defect detection sensor 76. Therefore, it is not necessary to perform the defect winding process, and the defect detection flag is off.

In step S14, it is determined whether or not the positive electrode sheet 4 for one element is wound. If a negative determination is made in step S14, that is, if it is necessary to continue supplying the positive electrode sheet 4, the process proceeds to step S15.

In step S15, the defect detection sensor 76 determines whether or not the defect termination marker M2 has been detected. If a negative determination is made in step S15, the process returns to step S14.

On the other hand, if an affirmative determination is made in step S15, the length detecting unit 82 acquires the feeding amount of the positive electrode sheet 4 from the start of winding at the time when the defective end marker M2 is detected in step S16. To do. In the present embodiment, the acquired feeding amount corresponds to the distance from the start end of the positive electrode sheet 4 to the defective end marker M2 at the start of the next defective winding process.

In the following step S17, the acquired unwinding amount is stored in the RAM or hard disk of the control device 81 as the defective take-up distance LA, and the defective detection process is completed. The defective winding distance LA is the length of the positive electrode sheet 4 to be wound by the defective winding core 924. The initial value of the defective winding distance LA is a preset value (for example, 0).

On the other hand, when an affirmative determination is made in step S14, that is, when the supply of the positive electrode sheet 4 for one element is completed, the defect detection process is terminated. At this time, since the defective start marker M1 is detected but the defective end marker M2 is not detected, the defect detection flag is on, but the defective winding distance LA remains at the initial value.

As a result, by performing the defect detection process, the defect detection flag is turned on, the defective winding distance LA other than the initial value is stored, the defective detection flag is turned on, and the defective winding is performed. Either a state in which the distance LA is the initial value or a state in which the defect detection flag is off will occur.

Next, the defective winding process will be described. The defective winding process is a process performed to wind the defective portions of the electrode sheets 4 and 5 by the defective winding core 924 when the defect detection flag is turned on at the end of the manufacturing process of the battery element 1. In the defective winding process, as shown in FIG. 8, the pre-winding process in step S21 and the winding process in step S22 are performed in this order. Hereinafter, the defective winding process for the positive electrode sheet 4 will be described, but the same process will be performed on the negative electrode sheet 5 side as well.

The pre-winding process is a process of acquiring information necessary for performing the process during winding. In the prewinding process, as shown in FIG. 9, first, in step S31, it is determined whether or not the defective winding distance LA is the initial value. That is, it is determined whether or not the defective end marker M2 has already been detected in the defective detection process.

When the defective winding distance LA is already set to a value other than the initial value (step S31: NO), from the information regarding the thickness of each part of the positive electrode sheet 4 obtained in advance in step S32, the defective winding distance LA is defective from the beginning. The thickness of each part of the positive electrode sheet 4 up to the terminal marker M2 is acquired. Next, in step S33, the average thickness of the positive electrode sheet 4 from the start end to the defective end marker M2 is acquired by using the thickness of each part of the positive electrode sheet 4 and the defective winding distance LA. Then, in step S34, the acquired average thickness is stored in the RAM or the hard disk as the unit movement amount YM, and the process proceeds to step S35. The unit movement amount YM is a parameter used for controlling the movement mechanism 96 by the movement control unit 85 when the positive electrode sheet 4 is wound by the defective winding core 924.

In step S35, the defect identified flag is turned on, and the process proceeds to step S39. The defect-identified flag is identification information for indicating that the entire area of the positive electrode sheet 4 to be wound is already grasped at the start of winding the positive electrode sheet 4 by the defective winding core 924.

On the other hand, when the defective winding distance LA is the initial value (step S31: YES), that is, when the defective end marker M2 has not been detected yet, the process proceeds to step S36, and each part of the positive electrode sheet 4 obtained in advance. From the information regarding the thickness of the positive electrode sheet 4, the thickness of each part of the positive electrode sheet 4 from the start end to the part corresponding to the defect detection sensor 76 (hereinafter, may be referred to as “the part corresponding to the sensor at the start of winding”) is acquired. Next, in step S37, the thickness of each part of the acquired positive electrode sheet 4 and the length of the positive electrode sheet 4 located between the start end and the sensor corresponding portion at the start of winding (this length is equivalent to one element). The average thickness of the positive electrode sheet 4 from the start end to the part corresponding to the sensor at the start of winding is obtained by using (equal to the length of the positive electrode sheet 4). Then, in step S38, the acquired average thickness is stored in the RAM or the hard disk as the primary unit movement amount YM1, and the process proceeds to step S39. The primary unit movement amount YM1 is a parameter used for controlling the movement mechanism 96 by the movement control unit 85 when the positive electrode sheet 4 is wound by the defective winding core 924. However, the primary unit movement amount YM1 is wound from the start end, especially when the entire area of the positive electrode sheet 4 to be wound is not grasped at the start of winding the positive electrode sheet 4 by the defective winding core 924. It is used when winding the positive electrode sheet 4 located between the sensor-corresponding part at the start of winding.

Then, the process of step S39 is performed following step S35 or step S38, and the prewinding process is completed. In step S39, the drive unit 925 moves the shaft portion 921, the circular base portion 922, the cover portion 923, and the defective winding core 924 from the retracted position to the forward position, thereby moving the defective winding core 924 from the retracted position. The cover portion 923 is moved to the winding position (see FIG. 15; the cover portion 923 is not shown in FIG. 15). The slit 924s of the defective winding core 924 arranged at the forward position is in a state parallel to the transport path of the positive electrode sheet 4.

Next, the process during winding will be described. The winding process is a process of acquiring parameters used for controlling the moving mechanism 96 as necessary while performing winding of the portion of the positive electrode sheet 4 including the defective portion by the defective winding core 924. .. In the winding process, as shown in FIG. 10, first, in step S41, it is determined whether or not the defect identification flag is on. If an affirmative determination is made in step S41, the process proceeds to step S42, and if a negative determination is made in step S41, the process proceeds to step S45.

In step S42, the winding start processing is performed. In the winding start processing, as shown in FIG. 11, first, in step S51, the sheet supply mechanism 71 for gripping the positive electrode sheet 4 approaches the defective winding winding core 924, and the positive electrode sheet 4 is inserted into the slit 924s. By inserting the positive electrode sheet 4, the positive electrode sheet 4 is supplied to the defective winding core 924 (see FIG. 16). After the supply, the seat supply mechanism 71 returns to the original position after releasing the gripping state.

In the following step S52, the rotation of the defective winding core 924 is started. At this time, the rotation speed of the defective winding core 924 is considered to be slightly low.

Next, in step S53, the rotation angle θ (however, 90 ° or less) from the start of rotation of the defective winding core 924 is acquired, and the movement mechanism 96 is controlled to base only the distance corresponding to the rotation angle θ. The portion 95 is moved vertically downward (see FIGS. 17 and 18).

For example, the base portion 95 is moved vertically downward from the position at the start of rotation by a value obtained by multiplying the radius r (mm) of the defective winding core 924 by sin θ (or an approximate value of the value). As a result, it is possible to prevent the winding portion of the positive electrode sheet 4 from being displaced upward by the defective winding core 924, and at the initial stage of winding, the positive electrode sheet corresponding to the sheet supply mechanism 71 and the electrode cutter 72. The transport path of 4 can be maintained at a fixed position. It should be noted that "the transport path is maintained at a fixed position" is not only when the transport path is maintained at a constant position in a strict sense, but also within a substantially constant range (for example, ideal). It also includes the case where it is maintained within ± 10 mm from the transport path along the direction orthogonal to the transport path (hereinafter, the same applies).

In the following step S54, it is determined whether or not the rotation angle θ has reached 90 °. If a negative determination is made in step S54, the process returns to step S53. As a result, before the rotation angle θ reaches 90 °, the defective winding core 924 is gradually moved according to the rotation angle θ.

On the other hand, if an affirmative determination is made in step S54, the process proceeds to step S55, the defective winding core 924 is rotated at a preset normal speed, and the winding start processing is completed.

Returning to FIG. 10, following the winding start process in step S42, the defect identification process is performed in step S43. In the defect identification process, as shown in FIG. 12, by performing the processes of steps S61, S62, and S63, basically, every time the defective winding core 924 rotates once, the unit is moved by the moving mechanism 96. The defective winding core 924 and the like are moved vertically downward by the amount YM. As a result, even if the defective winding core 924 or the like moves according to the change in the outer diameter of the electrode sheet 4 during winding and the outer diameter of the wound positive electrode sheet 4 changes, at least the sheet supply mechanism 71 And the transport path of the positive electrode sheet 4 corresponding to the electrode cutter 72 is maintained at a fixed position (see FIGS. 19 and 20).

Then, when an affirmative determination is made in step S61, that is, when the amount of feeding of the positive electrode sheet 4 from the start of winding by the defective winding core 924 reaches the defective winding distance LA, the defective identification process is terminated. ..

Returning to FIG. 10, following the defect identification process in step S43, the winding end process is performed in step S44. In the winding end processing, as shown in FIG. 14, first, in step S91, the rotation of the defective winding winding core 924 is temporarily stopped. At this time, the defective termination marker M2 is located immediately downstream of the electrode cutter 72. Subsequently, in step S92, the positive electrode sheet 4 is gripped by the sheet supply mechanism 71 and then cut by the electrode cutter 72. Next, in step S93, the remaining winding portion of the positive electrode sheet 4 is wound by rotating the defective winding core 924 by a certain number. After winding, the position of the defective winding core 924 is adjusted so that the slit 924s is parallel to the transport path of the positive electrode sheet 4. In the following step S94, the removal mechanism 94 is moved from the retracted position to the forward position, and the removal claw portion 943 is arranged in the slit 924s.

Then, in step S95, the defective winding core 924, the cover portion 923, and the like are moved from the forward position to the backward position, so that the defective winding core 924 is moved from the winding position to the retracted position. As a result, the wound positive electrode sheet 4 (referred to as "defective sheet roll 4F") comes into contact with the external claw portion 943 and movement is restricted, while the defective winding core 924 is removed from the defective sheet roll 4F. It gradually exits (see FIG. 21). Finally, the defective sheet roll 4F falls off the defective winding winding core 924 and is accommodated in the defective sheet accommodating portion 952. When the defective winding process is performed only on one of the two electrode sheets 4 and 5, the battery element 1 is subjected to the stage where the defective winding core 924 is moved to the retracted position. Production resumes. That is, the production of the battery element 1 is restarted before the defective winding core 924 or the like is moved to the original position (the position before the movement by the moving mechanism 96) by the moving mechanism 96.

Then, in step S96, the winding core unit 92 is moved to the original position. That is, the moving mechanism 96 returns the base portion 95 (defective winding core 924, etc.) to the original position, and the removing mechanism 94 is arranged in the retracted position. Finally, in step S97, each flag and various set values are reset, and the defective winding process is completed.

Returning to FIG. 10, when the defect identification flag is off, that is, when a negative determination is made in step S41, the winding start processing is performed in step S45 in the same manner as in step S42. Further, following the winding start process in step S45, a defect unidentified process is performed in step S46.

In the defect unidentified processing, as shown in FIG. 13, by first performing the processing of steps S71, S72, S73, and S74, the amount of extension of the positive electrode sheet 4 corresponds to the sensor at the start of winding from the start end of the electrode sheet 4. Each time the defective winding core 924 makes one rotation until the distance to the part (that is, one element) is reached, the moving mechanism 96 moves the defective winding core 924 and the like by the primary unit movement amount YM1. Let me. That is, when the defective winding core 924 winds the portion from the start end of the electrode sheet 4 to the portion corresponding to the sensor at the start of winding, the defective winding core 924 is formed using the average thickness of the portion. Move. As a result, even if the outer diameter of the wound positive electrode sheet 4 fluctuates, the transport path of the positive electrode sheet 4 corresponding to the sheet supply mechanism 71 and the electrode cutter 72 is maintained at a fixed position.

However, if an affirmative determination is made in step S71, that is, if the defective end marker M2 is detected by the defective detection sensor 76, the process proceeds to step S75, and the defective winding at the time when the defective end marker M2 is detected. The amount of feeding of the positive electrode sheet 4 from the start of winding by the core 924 is acquired. The acquired feeding amount corresponds to the distance from the sensor-corresponding portion at the start of winding along the transport path of the positive electrode sheet 4 to the defective end marker M2. In the present embodiment, since the distance from the defective start marker M1 to the defective end marker M2 is less than the length of the positive electrode sheet 4 for one element, the positive electrode sheet 4 for one element is usually wound. The defective termination marker M2 is detected before being turned, that is, before a positive determination is made in step S72. Further, if an affirmative determination is made in step S71, the process of step S71 is skipped in the subsequent processes in this defect unspecified process. That is, the process of steps S72, S73, and S74 is repeated.

In step S76 following step S75, the acquired feeding amount is stored in the RAM or the like as a defective winding distance LB. The defective winding distance LB is the length of the positive electrode sheet 4 to be wound by the defective winding core 924 after winding the positive electrode sheet 4 for one element, that is, after being positively determined in step S72. That's right. Next, in step S77, the thickness of each part of the positive electrode sheet 4 from the part corresponding to the sensor at the start of winding to the defective end marker M2 is acquired.

After that, in step S78, the average thickness of the positive electrode sheet 4 from the sensor-corresponding portion at the start of winding to the defective end marker M2 is acquired by using the acquired thickness of each portion and the defective winding distance LB. Then, in step S79, the acquired average thickness is stored in the RAM or the hard disk as the secondary unit movement amount YM2, and the process returns to step S72. The secondary unit movement amount YM2 is a parameter used for movement control of the movement mechanism 96 by the movement control unit 85 when the positive electrode sheet 4 is wound by the defective winding core 924, and is particularly a sensor at the start of winding. It is used when winding the positive electrode sheet 4 located between the corresponding part and the defective end marker M2.

Further, if an affirmative determination is made in step S72, that is, when the amount of feeding of the positive electrode sheet 4 from the start of winding reaches the length of the positive electrode sheet 4 for one element, steps S80, S81, and S82 are performed. By performing the process, each time the defective winding core 924 makes one rotation, the moving mechanism 96 moves the defective winding core 924 or the like by the secondary unit movement amount YM2. That is, when the defective winding core 924 winds the portion of the electrode sheet 4 from the sensor-corresponding portion at the winding start to the defective end marker M2, the defective winding is performed using the average thickness of the portion. The core 924 and the like are moved.

Then, when an affirmative determination is made in step 80, that is, when the amount of feeding of the positive electrode sheet 4 from the time when the winding of the positive electrode sheet 4 for one element is completed reaches the defective winding distance LB, the defect has been identified. End the process. After that, in the process at the end of winding in step S47, the same process as in step S44 is performed (see FIG. 10), and the defective winding process is completed.

As described in detail above, according to the present embodiment, even if the outer diameters of the wound electrode sheets 4 and 5 fluctuate during the winding of the electrode sheets 4 and 5 by the defective winding core 924, even if the outer diameters of the wound electrode sheets 4 and 5 fluctuate. At least the transport path corresponding to the sheet supply mechanism 71 and the electrode cutter 72 can be maintained at a fixed position. Therefore, even if the distance between the double-edged blades 72a and 72b in the open state is small, it is possible to prevent the electrode sheets 4 and 5 from coming into contact with the electrode cutters 72 (blade portions 72a and 72b), and both gripped portions in the open state. Even if the distance between the 71a and 71b is small, it is possible to prevent the electrode sheets 4 and 5 from coming into contact with the sheet supply mechanism 71 (grip portions 71a and 71b). Therefore, while preventing the electrode sheets 4 and 5 from coming into contact with the electrode cutter 72 and the sheet supply mechanism 71, the amount of operation during the opening / closing operation of the electrode cutter 72 and the sheet supply mechanism 71 can be reduced. As a result, the space required for arranging the electrode cutter 72 and the sheet supply mechanism 71 can be reduced, and the winding device 10 can be downsized. In addition, it is possible to suppress an increase in costs related to the manufacture of the winding device 10.

Further, in the present embodiment, the transport path can be maintained at a fixed position by moving the defective winding core 924 or the like by the moving mechanism 96 according to the fluctuation of the outer diameters of the electrode sheets 4 and 5. Therefore, the transport path can be maintained at a fixed position without providing another mechanism for contacting the electrode sheets 4 and 5. As a result, the electrode sheets 4 and 5 meander due to the contact between the electrode sheets 4 and 5 and another mechanism, and an abnormality occurs in the winding of the electrode sheets 4 and 5 by the defective winding core 924. It is possible to prevent it from happening more reliably. Further, it is possible to prevent the active material from scattering from the electrode sheets 4 and 5 due to contact with another mechanism. In addition, it is not necessary to provide a space for installing another mechanism, and it is possible to further reduce the size of the winding device 10 and suppress the increase in cost.

Further, the moving mechanism 96 is controlled based on the detection result regarding the thickness and length of the portion of the electrode sheets 4 and 5 that is wound by the defective winding core 924. Therefore, the movement of the defective winding core 924 can be controlled more appropriately according to the state of the electrode sheets 4 and 5 actually wound by the defective winding core 924, and thus the transport path can be more reliably controlled. It can be maintained in a fixed position. Therefore, the distance between the double-edged blades 72a and 72b in the open state can be made smaller, and the distance between the two grips 71a and 71b in the open state can be made smaller. As a result, the amount of operation during the opening / closing operation of the electrode cutter 72 and the sheet supply mechanism 71 can be made smaller, and the arrangement space related to the electrode cutter 72 and the sheet supply mechanism 71 can be reduced more effectively. Can be done. As a result, it is possible to further suppress the increase in cost related to the miniaturization of the winding device 10 and the manufacture of the winding device 10.

Further, the defective winding core 924 is movable between the winding position overlapping the transport paths of the electrode sheets 4 and 5 and the retracting position deviating from the transport path. Therefore, by arranging the defective winding core 924 in the retracted position, the defective winding core 924 becomes an electrode when the defective parts of the electrode sheets 4 and 5 are not wound, such as when the battery element 1 is manufactured. It is possible to prevent the sheets 4 and 5 from being adversely affected.

Further, when the electrode sheets 4 and 5 are wound by the defective winding core 924, the tip of the defective winding core 924 is supported by the winding core support portion 93 that moves in the same manner as the defective winding core 924. can do. Therefore, during the winding of the electrode sheets 4 and 5, the defective winding core 924 can be supported more stably by the winding core support portion 93, and the defective winding core 924 is deformed such as bending. It is possible to prevent it from being stored more reliably. As a result, the electrode sheets 4 and 5 can be wound in a more appropriate state.

In addition, since the removal mechanism 94 moves in the same manner as the defective winding core 924, when the amount of movement of the defective winding core 924 fluctuates depending on the thickness and length of the electrode sheets 4 and 5 to be wound. Even so, when the winding is completed, the relative positional relationship between the defective winding core 924 and the removal mechanism 94 can be kept constant. Therefore, the defective winding core 924 is not returned to the original position along the direction orthogonal to the rotation axis, and the position of the defective winding core 924 is not adjusted along the direction orthogonal to the rotation axis. In both cases, by moving the defective winding core 924 from the winding position to the retracted position, the defective winding core 924 can be removed from the defective sheet roll 4F by the removal mechanism 94.

Further, since the defective winding core 924 can be moved to the retracted position before returning the defective winding core 924 to the original position along the direction orthogonal to its own rotation axis, the present embodiment As described above, the production of the battery element 1 can be restarted at the stage where the defective winding core 924 is moved to the retracted position without returning to the original position. Therefore, the productivity can be improved as compared with the case where the defective winding core 924 is returned to the original position and moved to the retracted position and then the production of the battery element 1 is restarted.

Further, the moving mechanism 96 can move the winding core support portion 93 and the removing mechanism 94 in the same manner as the moving mode of the defective winding core 924. Therefore, it is not necessary to provide a mechanism for moving the winding core support portion 93 and the removing mechanism 94 separately from the moving mechanism 96, and it is possible to more effectively reduce the size of the winding device 10 and suppress the increase in cost. Can be done.

In addition, since the defective winding core 924 has a circular cross section, it is possible to prevent fluctuations in the transport path depending on the rotation angle of the defective winding core 924. Therefore, the movement control of the defective winding core 924 by the moving mechanism 96 can be easily performed.

Further, in the defective winding process, the defective winding core 924 winds the portion of the electrode sheets 4 and 5 up to the defective terminal marker M2, so that the defective electrode sheets 4 and 5 wound by the defective winding core 924 are good products. Can be reduced. As a result, it is possible to more reliably suppress the increase in the cost related to the manufacture of the battery element 1.
[Second Embodiment]
Next, the second embodiment will be described focusing on the differences from the first embodiment.

In the first embodiment, the path maintaining means is configured by the moving mechanism 96 that moves the defective winding core 924 and the like. On the other hand, in the second embodiment, as shown in FIGS. 22 and 23, the path maintaining means is configured by the path changing roller 97 provided along the conveying path of the positive electrode sheet 4. The path changing roller 97 is provided downstream of the electrode cutter 72 and upstream of the defective winding core 924. The path changing roller 97 is composed of a freely rotatable roller (pulley). In the following, the path changing roller 97 provided in the positive electrode sheet supply mechanism 31 will be described, but a similar path changing roller 97 is also provided in the negative electrode sheet supply mechanism 41.

The path changing roller 97 is provided at a position slightly separated from the transport path of the positive electrode sheet 4 at the time of manufacturing the battery element 1, and the transport path of the positive electrode sheet 4 is wound by the defective winding core 924. Comes into contact with the positive electrode sheet 4 when is slightly moved. In this way, when winding by the defective winding core 924, the path changing roller 97 and the positive electrode sheet 4 come into contact with each other, so that the outer diameter of the positive electrode sheet 4 wound by the defective winding core 924 fluctuates. It is also possible to maintain at least the transport path of the positive electrode sheet 4 corresponding to the sheet supply mechanism 71 and the electrode cutter 72 at a fixed position. On the other hand, in the second embodiment, when the battery element 1 is manufactured, the path changing roller 97 and the positive electrode sheet 4 do not come into contact with each other unless a problem such as a large swing of the positive electrode sheet 4 occurs.

As described above, according to the second embodiment, the path maintaining means is configured by the path changing roller 97. Therefore, the path maintaining means can be realized by a simple configuration, and the increase in cost related to the manufacture of the winding device 10 and the like can be suppressed more reliably.

Further, the path changing roller 97 is provided at a position where it comes into contact with the electrode sheets 4 and 5 only when the electrode sheets 4 and 5 are wound by the defective winding core 924, and is defective when the battery element 1 is manufactured. When the electrode sheets 4 and 5 are not wound by the winding core 924, the contact between the electrode sheets 4 and 5 and the path changing roller 97 is suppressed. As a result, it is possible to more reliably prevent defects caused by contact between the electrode sheets 4 and 5 and the path changing roller 97 (for example, meandering of the electrode sheets 4 and 5 and scattering of the active material).

Further, since the defective winding core 924 has a circular cross section, it is possible to suppress the fluttering of the transport path between the path changing roller 97 and the defective winding core 924, and the meandering of the electrode sheets 4 and 5 and the active material It is possible to prevent the scattering of the eggplant more reliably.

The content is not limited to the description of the above embodiment, and may be implemented as follows, for example. Of course, other application examples and modification examples not illustrated below are also possible.

(A) In the first embodiment, the thickness detecting unit 83 is configured to detect the thickness of the entire area of the electrode sheets 4 and 5 along the longitudinal direction. On the other hand, the thickness detecting unit may be configured to detect at least the thickness of the portion of the electrode sheets 4 and 5 wound by the defective winding core 924.

(B) In the first embodiment, the average thickness of the portion of the electrode sheets 4 and 5 wound by the defective winding core 924 is obtained, and the average thickness is used to obtain the defective winding core 924 and the like. It is configured to control the movement of the. On the other hand, the movement control of the defective winding core 924 may be performed by using a preset constant value (for example, an input value) or a measured value of the thickness of only one place.

Further, the movement of the defective winding core 924 may be controlled by using the thickness of the portion of the electrode sheets 4 and 5 that is just wound by the defective winding core 924.

Further, the movement amount of the defective winding core 924 may be adjusted in consideration of the thickness of the electrode sheets 4 and 5 already wound by the defective winding core 924. Further, the movement amount of the defective winding core 924 may be adjusted in consideration of the tension applied to the electrode sheets 4 and 5.

In addition, in the first embodiment, the defective winding core 924 is configured to move each time the defective winding core 924 is rotated once. That is, it is configured to move the defective winding core 924 stepwise. On the other hand, the defective winding core 924 may be configured to be continuously moved.

Further, the defective winding core 924 may be configured to be moved at regular intervals, or the defective winding core 924 may be configured to be moved according to the winding length of the electrode sheets 4 and 5. You may.

(C) In the above embodiment, the lengths of the electrode sheets 4 and 5 wound by the defective winding core 924 are configured to change, but a preset defective portion is sufficiently wound. The electrode sheets 4 and 5 having a constant length that can be wound may be wound by a defective winding core 924.

(D) In the second embodiment, the path changing roller 97 is configured to come into contact with the electrode sheets 4 and 5 only when the electrode sheets 4 and 5 are wound by the defective winding core 924. The change roller 97 may be configured to always be in contact with the electrode sheets 4 and 5.

(E) In the above embodiment, the winding targets by the defective winding core 924 are the positive electrode sheet 4 and the negative electrode sheet 5. On the other hand, the target of winding by the defective winding core may be the separator sheets 2 and 3. That is, the separator sheets 2 and 3 may be configured to correspond to the target sheet.

(F) In the second embodiment, the cover portion 923 and the path changing roller 97 are provided separately, but as shown in FIG. 24, the path changing roller 98 may form a part of the cover portion 926. Good. In this case, it is possible to increase the space for installing various devices (for example, the sheet supply mechanism 71, the electrode cutter 72, etc.).

Further, the path change roller may be provided within the range surrounded by the cover portion 923. In this case, even if the active material is scattered due to the contact between the path changing roller and the electrode sheets 4 and 5, it is possible to more reliably prevent the active material from diffusing out of the cover portion 923.

(G) In the above embodiment, the portion between the defective start marker M1 and the defective end marker M2 in the electrode sheets 4 and 5 is treated as a defective portion of the electrode sheets 4 and 5. On the other hand, for example, only the defective start marker indicating the start end of the defective portion is attached to the electrode sheets 4 and 5, and a predetermined range is treated as the defective portion of the electrode sheets 4 and 5 on the downstream side from the defective start marker. It may be configured as.

Further, the electrode sheets 4 and 5 do not necessarily have to be provided with a marker indicating a defective portion. Therefore, for example, an imaging device for imaging the electrode sheets 4 and 5 and an inspection device for detecting defective portions of the electrode sheets 4 and 5 based on the image obtained by the imaging device are provided, and the detection is performed by the inspection device. The defective portion may be wound by the defective winding core 924.

(H) In the above embodiment, the defect detection sensor 76 for detecting the defective portion of the electrode sheets 4 and 5 is provided, but it is not always necessary to provide the defect detection sensor 76. For example, information on defective parts of the electrode sheets 4 and 5 is acquired in advance at a stage before the electrode sheets 4 and 5 are conveyed to the winding cores 13 and 14 such as when the raw fabrics 31 and 41 are manufactured. According to the information, the defective portions of the electrode sheets 4 and 5 may be wound up. Further, for example, when defective parts are present at regular intervals along the longitudinal direction of the electrode sheets 4 and 5, the defective parts of the electrode sheets 4 and 5 are wound up at a constant timing according to the intervals. May be done.

(I) In the first embodiment, the defective winding core 924 is configured to move according to the rotation angle θ at the initial stage of winding the electrode sheets 4 and 5 by the defective winding core 924. For example, when the defective winding core 924 is sufficiently thin, the defective winding core 924 may not be moved according to the rotation angle θ.

(J) In the above embodiment, the winding portion 11 is configured to include two winding cores 13 and 14, but the number of winding cores is not limited to this, and one or three. The configuration may include the above winding cores. Of course, the shape of the winding core can be changed as appropriate.

(K) In the above embodiment, the battery element 1 of the lithium ion battery is manufactured by the winding device 10, but the winding element manufactured by the winding device 10 is not limited to this, for example. , A winding element of an electrolytic capacitor or the like may be manufactured.

(L) The materials of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are not limited to the above embodiments. For example, in the above embodiment, PP is mentioned as the material of the separator sheets 2 and 3, but the separator sheets 2 and 3 may be formed of other insulating materials. Further, for example, the active material applied to the electrode sheets 4 and 5 may be appropriately changed.

1 ... Battery element (winding element), 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 10 ... Winding device, 13, 14 ... Winding core, 71 ... Sheet supply mechanism (sheet supply) Means), 71a, 71b ... Gripping part, 72 ... Electrode cutter (sheet cutting means), 72a, 72b ... Blade part, 82 ... Length detecting part (length detecting means), 83 ... Thickness detecting part (thickness detecting means) Means), 85 ... Movement control unit (movement control means), 93 ... Wind core support part (support means), 94 ... Removal mechanism (removal means), 96 ... Movement mechanism (path maintenance means, winding core movement means) , 97, 98 ... Path change roller (path maintenance means), 924 ... Defective winding core.

Claims (7)

A band-shaped electrode sheet having an active material on its surface and a band-shaped separator sheet made of an insulating material are supplied to a rotatably provided winding core, and the rotation of the winding core causes the electrode sheet and the separator sheet to rotate. It is a winding device that winds while stacking
The electrode sheet and at least one of the separator sheets are provided along the transport path of the target sheet, and are provided with two grip portions arranged at positions sandwiching the transport path of the target sheet. A sheet supply means capable of switching between gripping and releasing of the target sheet by an opening / closing operation and supplying the target sheet in a gripped state toward the winding core.
It is provided with two blades provided downstream of the sheet supply means along the transport path and arranged at positions sandwiching the transport path of the target sheet, and the target sheet is cut by opening and closing the blades. Cutting means and
A rod-shaped defective winding core provided downstream of the cutting means along the transport path and capable of winding a part of the target sheet including a defective portion by its own rotation.
Even if the outer diameter of the target sheet wound by the defective winding core fluctuates during winding of the target sheet by the defective winding core, at least the sheet supplying means and the cutting means are supported. A winding device including a path maintaining means for maintaining the transport path at a fixed position. The path maintaining means is configured by a winding core moving means capable of moving the defective winding core along a direction orthogonal to the rotation axis when the target sheet is wound by the defective winding core. The winding device according to claim 1, wherein the winding device is characterized in that. A thickness detecting means for detecting at least the thickness of a portion of the target sheet wound around the defective winding core, and
A length detecting means for detecting at least the length of a portion of the target sheet wound around the defective winding core, and
The winding device according to claim 2, further comprising a movement control means for controlling the winding core moving means based on the respective detection results of the thickness detecting means and the length detecting means. The defective winding core is configured to be movable between a winding position that overlaps the transport path and a retracted position that deviates from the transport path along its own rotation axis direction.
A support means for supporting the tip of the defective winding core when the defective winding core is arranged at the winding position and the target sheet is wound.
After the target sheet is wound by the defective winding core, it comes into contact with the wound target sheet, and in this state, the defective winding core moves from the winding position to the retracted position. The target sheet that has been wound up while being caught by itself is provided with a removing means that can be removed from the defective winding core.
Any one of claims 2 or 3, wherein the winding core moving means is configured to move the supporting means and the removing means in the same movement mode as the defective winding core. The winding device according to item 1. The winding device according to any one of claims 2 to 4, wherein the defective winding core has a circular outer peripheral surface in a cross section orthogonal to its own rotation axis. The winding device according to claim 1, wherein the path maintaining means is composed of a rotatable path changing roller that comes into contact with the target sheet upstream of the defective winding core. The winding device according to claim 6, wherein the path changing roller is provided at a position where the target sheet comes into contact with the target sheet only when the target sheet is wound by the defective winding core.

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