Method for replacing bobbin

Abstract

The present invention relates to a method for replacing a bobbin for automatically connecting an electrode sheet to a new bobbin through a control unit. Specifically, the method for replacing a bobbin of the present invention includes: a first winding step of winding an electrode sheet on a first bobbin; a step of preparing a second bobbin in which a double-sided tape and a marking sticker are attached to one side and which is disposed to be spaced a predetermined interval apart from the electrode sheet; a position adjustment step of adjusting a stop position of the second bobbin by rotating the second bobbin; an attachment step of moving the second bobbin to attach the double-sided tape to the electrode sheet; a cutting step of cutting the electrode sheet extended between the bobbin on which the electrode sheet is wound and the second bobbin; and a second winding step of winding the electrode sheet on the second bobbin by rotating the second bobbin, wherein in the position adjustment step, the control unit controls the stop position of the second bobbin on the basis of the position of the marking sticker.

Description

How to replace a bobbin

[0001] The present invention relates to a bobbin replacement method, and more particularly, to a bobbin replacement method capable of efficiently automating the replacement of a bobbin for winding an electrode sheet.

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0132331, dated October 5, 2023, the entire contents of which are incorporated herein by reference.

[0003]

[0004] When transporting electrode sheets in a roll-to-roll manner for secondary battery manufacturing, an unwinder and a rewinder are used. These unwinders and rewinders chuck and join electrode sheet rolls, and the electrode sheets travel in a roll-to-roll manner between the unwinder and rewinder, where they undergo certain processing.

[0005] The electrode sheet rolls chucked in the above-described unwinder and rewinder are structured such that the electrodes are wound on a bobbin. When winding the electrode sheet onto a bobbin, if the electrode sheet is immediately wound onto the bobbin, the wound electrode portion becomes usable loss. Therefore, rather than directly connecting the electrode sheet to the bobbin, a vinyl material substrate film or the like is first wound onto the bobbin, and then the electrode sheet is connected to the wound substrate film.

[0006] At this time, a transparent double-sided tape may be used to attach the electrode sheet to the substrate film. However, since the double-sided tape is transparent and cannot be recognized by a visual sensor or the like, a problem arises in that the process is delayed until the conventional visual sensor confirms the position of the double-sided tape.

[0007] Due to the above problem, workers are directly deployed to check the position of the double-sided tape, but this method is very cumbersome and has the problem of low process efficiency.

[0008] [Prior Art Literature]

[0009] Korean Patent Publication No. 10-2020-0136198

[0010]

[0011] Accordingly, the present invention was created to solve the above problems, and aims to provide a method capable of automatically attaching an electrode sheet to a new bobbin during a process of winding the electrode sheet.

[0012] In addition, the present invention aims to provide a method for efficiently performing the attachment in the process of connecting an electrode sheet to a new bobbin.

[0013] Other objects and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0014]

[0015] According to the present invention, a bobbin replacement method is provided for automatically connecting an electrode sheet to a new bobbin through a control unit. The bobbin replacement method comprises: a first winding step of winding an electrode sheet onto a first bobbin; a step of preparing a second bobbin, on one side of which double-sided tape and a marking sticker are attached, and which is positioned at a predetermined distance from the electrode sheet; a position adjusting step of rotating the second bobbin to adjust a stop position of the second bobbin; an attaching step of moving the second bobbin so that the double-sided tape is attached to the electrode sheet; a cutting step of cutting an electrode sheet extending between the first bobbin on which the electrode sheet is wound and the second bobbin; and a second winding step of rotating the second bobbin to wind the electrode sheet onto the second bobbin; wherein, in the position adjusting step, the control unit is characterized in that it controls the stop position of the second bobbin based on the position of the marking sticker.

[0016] A base film is provided around the second bobbin, and the double-sided tape can be placed on the base film.

[0017] The above-mentioned substrate film may include polyethylene terephthalate.

[0018] The second bobbin includes a marking sticker on one side, and the marking sticker can be attached to a position corresponding to the double-sided tape.

[0019] The above marking sticker may be positioned on the side of the double-sided tape based on the longitudinal direction of the second bobbin.

[0020] The above marking sticker may be positioned on at least one of the upper and lower portions of the double-sided tape based on the width direction of the second bobbin.

[0021] The above marking sticker may be positioned at a position overlapping the above double-sided tape.

[0022] The above marking sticker may be in either a dot shape or a line shape.

[0023] The above control unit can recognize a marking sticker corresponding to the double-sided tape position through a color sensor.

[0024] The above double-sided tape is composed of a colorless material that is substantially transparent in the visible light range, the above marking sticker is composed of a color, and the above color sensor can recognize the color of the above marking sticker.

[0025] The control unit recognizes the position of the double-sided tape based on the position of the marking sticker, and in the position adjustment step, the control unit can rotate the second bobbin so that the double-sided tape faces one side of the electrode sheet.

[0026] The control unit can control the rotation of the second bobbin to be stopped when the double-sided tape is positioned opposite the electrode sheet, and to move the stopped second bobbin to the electrode sheet so that the double-sided tape is attached to the electrode sheet.

[0027] The above control unit can control a cutting unit having a blade at an end to cut the electrode sheet adjacent to the second bobbin in the width direction.

[0028] The second bobbin may be configured to be rotatable around a rotational axis and to be moved forward and backward relative to the electrode sheet.

[0029]

[0030] According to the present invention, process efficiency can be improved by automating the process of connecting a coiled electrode sheet to a new bobbin. Furthermore, waste of electrode sheets during the process of connecting the electrode sheet to the bobbin can be reduced.

[0031]

[0032] Figure 1 is a perspective view of an electrode sheet being wound on a bobbin and a winding unit according to the first embodiment of the present invention.

[0033] Figure 2 is a flowchart of a bobbin replacement method of the present invention.

[0034] Figure 3 is a schematic diagram briefly showing the process flow for the position adjustment step or cutting step.

[0035] Figure 4 is a perspective view of the second bobbin rotating in the position adjustment step.

[0036] Figure 5 is a perspective view of the cutting unit of the present invention.

[0037] Fig. 6 is a perspective view of a winding unit showing the process of cutting an electrode sheet with the cutting unit of Fig. 5.

[0038] Figure 7 is a perspective view of a second bobbin according to a second embodiment of the present invention.

[0039] Figure 8 is a perspective view of a second bobbin according to a third embodiment of the present invention.

[0040] Fig. 9 is a perspective view of a second bobbin according to a fourth embodiment of the present invention.

[0041] Fig. 10 is a perspective view of a second bobbin according to a fifth embodiment of the present invention.

[0042]

[0043] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, they should be construed as meanings and concepts consistent with the technical spirit of the present invention.

[0044] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0045] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0046] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0047]

[0048] The present invention relates to a bobbin replacement method, and more particularly, to a bobbin replacement method capable of efficiently automating the replacement of a bobbin for winding an electrode sheet.

[0049] FIGS. 1 to 6 relate to a winding unit and a bobbin replacement method according to a first embodiment of the present invention, and FIGS. 7 to 10 relate to a winding unit according to a second to fifth embodiment of the present invention, respectively.

[0050] Hereinafter, with reference to the attached drawings, the present invention's bobbin and bobbin replacement method using the same will be described in detail. Note that the directions of front / back, up / down / left / right, etc. used to designate relative positions in the following description are intended to aid understanding of the invention, and unless otherwise specified, the directions depicted in the drawings will be used as a reference.

[0051]

[0052] Here, the longitudinal direction of the electrode sheet corresponds to the direction in which the electrode sheet moves, and the width direction of the electrode sheet corresponds to the direction orthogonal to the longitudinal direction of the electrode sheet.

[0053] Additionally, the width direction of the bobbin refers to the length direction of the electrode sheet, and the length direction of the bobbin refers to the width direction of the electrode sheet.

[0054]

[0055] (First embodiment)

[0056] Winding unit (1)

[0057] Figure 1 is a perspective view of an electrode sheet (S) being wound on a bobbin and a winding unit (1) according to the first embodiment of the present invention.

[0058] The above winding unit (1) includes a bobbin for winding an electrode sheet (S), a color sensor (60) for detecting the position of the bobbin, and a cutting unit (70) for cutting the electrode sheet (S) in the width direction of the electrode sheet (S).

[0059]

[0060] The above bobbin includes a first bobbin (10) that winds an electrode sheet (S) in advance as shown in FIG. 1, and a second bobbin (20) that waits to wind the electrode sheet (S) in succession in place of the first bobbin (10) when the amount of electrode sheet (S) wound on the first bobbin (10) exceeds a certain amount.

[0061] The above bobbin includes a double-sided tape (40) and a marking sticker (50) on one side.

[0062] The above double-sided tape (40) is used for the purpose of attaching the electrode sheet (S), and one side is attached to the circumference of the bobbin, while the other side remains exposed to the outside until it is attached to the electrode sheet (S).

[0063] The above double-sided tape (40) is composed of a vinyl film with an adhesive or pressure-sensitive adhesive applied to both sides.

[0064] The above double-sided tape (40) is composed of a colorless material. More specifically, the above double-sided tape (40) is composed of a colorless material that is substantially transparent in the visible light range.

[0065] The above marking sticker (50) is included in a position corresponding to the double-sided tape (40) and is composed of color.

[0066] The winding unit (1) of the present invention may further include a base film (30) that wraps around the circumference of the bobbin. The base film (30) is used to protect the electrode sheet (S) or to replace a portion of the electrode sheet (S) that may be discarded due to damage or the like during the process.

[0067] The above base film (30) is specifically attached so as to be in close contact with the surface of the bobbin, and the double-sided tape (40) and marking sticker (50) are prepared by being attached on the base film (30) attached to the bobbin.

[0068] The above-mentioned substrate film (30) is composed of a plastic material. For example, it may include a polyethylene terephthalate material.

[0069] The above bobbin is configured to be rotatable about the rotation axis (A) as well as moveable in horizontal and vertical directions. Accordingly, it is possible to adjust the position of the first bobbin (10) for winding the electrode sheet (S), and it is also possible to adjust the position of the second bobbin (20) that is in standby.

[0070]

[0071] The above color sensor (60) is a sensor that can recognize a specific color, and preferably recognizes the color of the marking sticker (50) included in the bobbin.

[0072] The color sensor (60) is positioned adjacent to the second bobbin (20) at a location that does not interfere with the transport of the electrode sheet (S) and the movement of the bobbin. At this time, the color sensor (60) is positioned so as to face the second bobbin (20) as shown in Fig. 1.

[0073]

[0074] The above cutting unit (70) is used for the purpose of cutting and separating the electrode sheet (S) wound on the first bobbin (10) and the electrode sheet (S) attached to the second bobbin (20).

[0075] More specific details regarding the above cutting unit (70) will be described again in the cutting step of the bobbin replacement method described below.

[0076]

[0077] The operation of the winding unit (1) of the present invention is controlled by a control unit. That is, the control unit can control the rotation and movement of the bobbin.

[0078] The control unit receives information in advance about the first bobbin (10) being wound, the path of the electrode sheet (S) being wound, the second bobbin (20) waiting on the electrode sheet (S), and the attachment positions of the double-sided tape (40) and the marking sticker (50) on the second bobbin (20), and controls the operation of the bobbin based on this to replace the first bobbin (10) with the second bobbin (20).

[0079] The above control unit receives position information of the marking sticker (50) recognized by the color sensor (60). Thereafter, the control unit can estimate the position of the double-sided tape (40) based on the position of the marking sticker (50).

[0080] Specifically, the control unit estimates the position of the double-sided tape (40) in reverse based on the position information of the marking sticker (50) and the double-sided tape (40) that have been input in advance, through the position information of the marking sticker (50) sent from the color sensor (60).

[0081] As a result, the control unit controls the rotation of the second bobbin (20) so that the double-sided tape (40) finally calculated is positioned opposite the surface of the electrode sheet (S) wound on the first bobbin (10).

[0082]

[0083] How to replace a bobbin

[0084] The bobbin replacement method of the present invention is characterized in that all processes are automatically performed through control of a control unit so that the replacement operation can be accurately performed when connecting an electrode sheet (S) to a new bobbin.

[0085] Fig. 2 is a flowchart of a bobbin replacement method of the present invention, and Fig. 3 is a schematic diagram briefly showing the process flow for a position adjustment step or a cutting step.

[0086] According to FIG. 2, the bobbin replacement method of the present invention can be divided into a bobbin preparation step, a bobbin preparation step, a position adjustment step, an attachment step, a cutting step, and a winding step.

[0087]

[0088] (S1) First winding stage

[0089] This is a step of winding an electrode sheet (S) onto the first bobbin (10).

[0090] The above electrode sheet (S) is transported in one direction toward the first bobbin (10).

[0091] The first bobbin (10) above rotates in one direction around the rotation axis (A), and the electrode sheet (S) connected to the first bobbin (10) is wound while receiving tension by the rotation of the first bobbin (10).

[0092] The above first bobbin (10) is rotated by a separately connected motor, and the feed speed and winding speed of the electrode string can be controlled according to the output of the motor.

[0093]

[0094] (S2) Preparation stage for the second bobbin (20)

[0095] This is a step of preparing a second bobbin (20) with a double-sided tape (40) and a marking sticker (50) attached to one side and positioned at a predetermined distance from the electrode sheet (S).

[0096] The second bobbin (20) includes a double-sided tape (40) and a marking sticker (50) on one side as shown in FIG. 1.

[0097] The second bobbin (20) is configured to be rotatable around a rotation axis (A) and move to an electrode sheet (S) wound on the first bobbin (10). That is, the second bobbin (20) is configured to be able to move forward and backward while facing the electrode sheet (S). At this time, the second bobbin (20) is provided so that the rotation axis (A) is horizontal to the rotation axis (A) of the first bobbin (10).

[0098] Since the second bobbin (20) must be operated independently from the first bobbin (10), the second bobbin (20) is rotated by a separate motor different from the motor connected to the first bobbin (10).

[0099] In some embodiments, a base film (30) may be provided around the second bobbin (20), and the double-sided tape (40) and marking sticker (50) may be placed on the base film (30).

[0100] The above-mentioned base film (30) is composed of a plastic material. For example, the above-mentioned base film (30) may include polyethylene terephthalate.

[0101] The second bobbin (20) included in the winding unit (1) according to the first embodiment of the present invention has the marking sticker (50) positioned parallel to the side of the double-sided tape (40) based on the longitudinal direction of the second bobbin (20), as shown in FIG. 1.

[0102] In some embodiments, the marking sticker (50) may be in the form of a dot as illustrated in FIG. 1.

[0103] Additionally, a color sensor (60) capable of recognizing the marking sticker (50) on the second bobbin (20) may be arranged and prepared in this step or the previous step.

[0104] The color sensor (60) is fixedly positioned so as to face the second bobbin (20) in the space between the first bobbin (10) and the second bobbin (20). More specifically, the color sensor (60) is positioned so that the double-sided tape (40) on the second bobbin (20) can be positioned exactly opposite the electrode sheet (S) at the time when the marking sticker (50) is recognized. Accordingly, the double-sided tape (40) attached on the second bobbin (20) faces the electrode sheet (S) at the time when the color sensor (60) recognizes the marking sticker (50).

[0105]

[0106] (S3) Position adjustment step

[0107] This is a step of adjusting the stop position of the second bobbin (20) by rotating the second bobbin (20).

[0108] The control unit of the present invention causes the second bobbin (20) to rotate idly so that the color sensor (60) can recognize the marking sticker (50) on the second bobbin (20), as shown in FIG. 3.

[0109] Fig. 4 is a perspective view of the second bobbin (20) rotating in the position adjustment stage.

[0110] The control unit rotates the second bobbin (20) so that the double-sided tape (40) faces the surface of the electrode sheet (S) based on the positional relationship between the marking sticker (50) and the double-sided tape (40) that has been input in advance and the positional information of the electrode sheet (S). Thereafter, the control unit stops the rotation of the second bobbin (20) when the color sensor (60) recognizes the marking sticker (50), as shown in FIGS. 2 and 4. That is, at the point in time when the second bobbin (20) stops, the double-sided tape (40) on the second bobbin (20) faces the upper surface of the electrode sheet (S).

[0111]

[0112] (S4) Attachment step

[0113] This is a step of moving the second bobbin (20) so that the double-sided tape (40) is attached to the electrode sheet (S).

[0114] The above control unit, as shown in Fig. 3, moves the second bobbin (20) in a straight line to the electrode sheet (S) while maintaining the state in which the double-sided tape (40) faces the electrode sheet (S).

[0115] Accordingly, the double-sided tape (40) on the second bobbin (20) is attached to the electrode sheet (S) in a state where it is interposed between the second bobbin (20) and the surface of the electrode sheet (S).

[0116] One side of the electrode sheet (S) attached to the double-sided tape (40) by the double-sided tape (40) is fixed to the second bobbin (20).

[0117]

[0118] (S5) Cutting stage

[0119] This is a step of cutting the electrode sheet (S) extending between the first bobbin (10) on which the electrode sheet (S) is wound and the second bobbin (20).

[0120] The above cutting is performed by a cutting unit (70) including a blade (71) at the end.

[0121] More specifically, the control unit controls the cutting unit (70) having a blade (71) at the end to cut the electrode sheet (S) adjacent to the second bobbin (20) in the width direction.

[0122] The above cutting unit (70) may be a plate shape that is vertically erected based on the surface of the electrode sheet (S).

[0123] FIG. 5 is a perspective view of a cutting unit (70) that can be used in some embodiments, and FIG. 6 is a perspective view of a winding unit (1) showing a process of cutting an electrode sheet (S) with the cutting unit (70) of FIG. 5.

[0124] The above cutting unit (70) has a blade (71) formed at the bottom as shown in FIG. 5, moves vertically up and down, and can cut an electrode sheet (S) passing through the lower part as shown in FIGS. 3 and 6.

[0125] The above cutting is performed along the width direction of the electrode sheet (S), and by the above cutting, the electrode sheet (S) connected to the first bobbin (10) is completely separated from the electrode sheet (S) connected to the second bobbin (20).

[0126] However, the cutting unit (70) is not limited to the shape shown in FIGS. 5 and 6, and any shape capable of cutting the electrode sheet (S) in the width direction of the electrode sheet (S) may be used. For example, the cutting unit (70) may be a rotating circular blade (71).

[0127]

[0128] (S6) Second winding stage

[0129] This is a step of rotating the second bobbin (20) to wind the electrode sheet (S) onto the second bobbin (20).

[0130] According to FIG. 3, the first bobbin (10) on which a certain amount of electrode sheets (S) are wound is separated and moved to another process, and the remaining electrode sheets (S) are wound again on the second bobbin (20) by rotation of the second bobbin (20).

[0131]

[0132] (2nd to 5th embodiments)

[0133] Winding unit (1)

[0134] The marking sticker (50) included in the winding unit (1) of the present invention can be provided at various locations, not just the side of the second bobbin (20). That is, as long as the control unit of the present invention recognizes the positional relationship between the double-sided tape (40) and the marking sticker (50), the position of the marking sticker (50) can be adjusted in various ways.

[0135] That is, the marking sticker (50) may be positioned at least on either the upper or lower side of the double-sided tape (40) based on the width direction of the second bobbin (20), or may be positioned so as to overlap the double-sided tape (40).

[0136] Additionally, the marking sticker (50) may be provided in a line form, unlike the marking sticker (50) included in the winding unit (1) according to the first embodiment.

[0137]

[0138] Figure 7 is a perspective view of a second bobbin (20) according to a second embodiment of the present invention.

[0139] The marking sticker (50) provided on the second bobbin (20) is located at the bottom of the double-sided tape (40) based on the width direction of the second bobbin (20).

[0140] In this case, the color sensor (60) can be positioned on the same horizontal line on the front or back of the second bobbin (20) to recognize the marking sticker (50). That is, the degree of freedom for the positioning of the color sensor (60) can be further increased.

[0141] Figure 8 is a perspective view of a second bobbin (20) according to a third embodiment of the present invention.

[0142] According to Fig. 8, the marking sticker (50) is positioned so as to overlap within the double-sided tape (40).

[0143] In this case, the double-sided tape (40) with the marking sticker (50) attached is attached at once without the need to perform two processes of attaching the double-sided tape (40) and the marking sticker (50) on the second bobbin (20) or the base film (30).

[0144] That is, the double-sided tape (40) with the marking sticker (50) attached has the effect of simplifying the process and improving efficiency.

[0145] Figure 9 is a perspective view of a second bobbin (20) according to a fourth embodiment of the present invention.

[0146] According to Fig. 9, the marking sticker (50) is provided in the form of a line on the side of the double-sided tape (40). Specifically, the marking sticker (50) extends along the rotational direction of the second bobbin (20), that is, along the circumferential direction of the second bobbin (20).

[0147] The above marking sticker (50) has the effect of increasing the recognition accuracy of the color sensor (60) by providing a wider area that can be recognized by the color sensor (60).

[0148] Fig. 10 is a perspective view of a second bobbin (20) according to the fifth embodiment of the present invention.

[0149] According to FIG. 10, the marking sticker (50) extends along the width direction of the second bobbin (20) from the lower portion of the double-sided tape (40).

[0150] In this case, there is an advantage in that the marking sticker (50) effect according to the second embodiment and the fourth embodiment can be obtained simultaneously.

[0151]

[0152] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0153]

[0154] [Explanation of symbols]

[0155] 1: Winding unit

[0156] 10: 1st bobbin

[0157] 20: Second bobbin

[0158] 30: Base film

[0159] 40: Double-sided tape

[0160] 50: Marking sticker

[0161] 60: Color sensor

[0162] 70: Cutting unit

[0163] 71: Blade

[0164] S: Electrode sheet

[0165] A: Rotation axis

Claims

1. A bobbin replacement method that automatically connects an electrode sheet to a new bobbin through a control unit, A first winding step of winding an electrode sheet onto a first bobbin; A step of preparing a second bobbin with double-sided tape and a marking sticker attached to one side and positioned at a predetermined distance from the electrode sheet; A position adjustment step for adjusting the stop position of the second bobbin by rotating the second bobbin; An attachment step of moving the second bobbin so that the double-sided tape is attached to the electrode sheet; A cutting step of cutting the electrode sheet extending between the first bobbin on which the electrode sheet is wound and the second bobbin; and A second winding step of winding the electrode sheet onto the second bobbin by rotating the second bobbin; A bobbin replacement method characterized in that, in the above position adjustment step, the control unit controls the stop position of the second bobbin based on the position of the marking sticker.

2. In paragraph 1, A base film is provided around the second bobbin, A bobbin replacement method in which the above double-sided tape is placed on the above base film.

3. In paragraph 2, The above-mentioned base film is a bobbin replacement method including polyethylene terephthalate.

4. In paragraph 1, The above second bobbin includes a marking sticker on one side, The above marking sticker is a bobbin replacement method attached to a position corresponding to the above double-sided tape.

5. In paragraph 4, A bobbin replacement method wherein the above marking sticker is located on the side of the double-sided tape based on the longitudinal direction of the second bobbin.

6. In paragraph 4, A bobbin replacement method wherein the marking sticker is located at least on one of the upper and lower sides of the double-sided tape based on the width direction of the second bobbin.

7. In paragraph 4, A bobbin replacement method wherein the above marking sticker is positioned at a position overlapping the above double-sided tape.

8. In paragraph 4, A method of replacing a bobbin, wherein the above marking sticker is in either a dot shape or a line shape.

9. In paragraph 4, A bobbin replacement method in which the above control unit recognizes a marking sticker corresponding to the double-sided tape position through a color sensor.

10. In paragraph 9, The above double-sided tape is composed of a colorless material that is substantially transparent in the visible light range, and the above marking sticker is composed of a color, The above color sensor is a bobbin replacement method that recognizes the color of the above marking sticker.

11. In paragraph 9, The above control unit recognizes the position of the double-sided tape based on the position of the marking sticker, A bobbin replacement method in which, in the above position adjustment step, the control unit rotates the second bobbin so that the double-sided tape faces the surface of the electrode sheet.

12. In paragraph 11, A bobbin replacement method in which the control unit stops the rotation of the second bobbin when the double-sided tape is positioned opposite the electrode sheet, and moves the stopped second bobbin to the electrode sheet so that the double-sided tape is attached to the electrode sheet.

13. In paragraph 1, A bobbin replacement method in which the above control unit controls a cutting unit having a blade at an end to cut an electrode sheet adjacent to the second bobbin in the width direction.

14. In paragraph 1, A bobbin replacement method wherein the second bobbin is configured to be rotatable around a rotation axis and to be moved forward and backward relative to the electrode sheet.

Images