JP2016043458A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device which can maintain a cut quality.SOLUTION: A cutting device 1 which includes a round upper blade 10 and a round lower blade 11, and cuts a belt-like electrode E, in which an active material layer is formed on a belt-like metal foil, by the overlapped parts of the upper blade 10 and the lower blade 11. The cutting device 1 is equipped with: an upper blade diameter acquisition part which acquires a diameter of the upper blade 10; a lower blade diameter acquisition part which acquires a diameter of the lower blade 11; an overlap quantity maintenance part which so maintains a vertical direction overlap quantity L of the upper blade 10 and the lower blade 11 as to be a predetermined quantity by use of a diameter of the upper blade 10 and a diameter of the lower blade 11; and a peripheral velocity ratio maintenance part which so maintains a peripheral ratio between a peripheral velocity V0 of the upper blade 10 and a peripheral velocity V1 of the lower blade 11 as to be a predetermined ratio by use of the diameter of the upper blade 10 and the diameter of the lower blade 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting device for cutting a strip electrode in which an active material layer is formed on a strip metal foil.

  When manufacturing the electrode used for a lithium ion secondary battery etc., there exists a process of cut | disconnecting the edge part etc. of a strip | belt-shaped electrode, conveying the strip | belt-shaped electrode in which the active material layer was formed in strip | belt-shaped metal foil. As this cutting device, for example, Patent Document 1 discloses a cutting device that includes a pair of upper and lower rotatable upper blades and lower blades, and cuts the belt electrode by entering the overlapping portion between the upper blade and the lower blade. Has been. The upper blade is a disk-shaped round blade and has an acute edge. The lower blade is a cylindrical round blade and has a substantially right cutting edge.

JP 2010-253615 A

  When a round blade is used for each blade of the cutting device, the blade edge of the round blade is worn as it is used. In particular, a round blade with a sharp edge tends to wear out. When the cutting edge is worn, the diameter of the round blade is reduced. When the diameter of the rotating round blade decreases, the peripheral speed of the round blade changes, and the peripheral speed ratio between the upper blade and the lower blade changes. When the peripheral speed ratio is changed, burrs are generated on the cut surface, and the cutting quality is deteriorated.

  Therefore, in this technical field, there is a demand for a cutting apparatus that can maintain cutting quality.

  A cutting device according to one aspect of the present invention includes a round blade upper blade and a round blade lower blade, and a belt-like electrode in which an active material layer is formed on a belt-like metal foil. A cutting device that cuts at a lapping portion, acquired by an upper blade diameter acquisition unit that acquires the diameter of the upper blade, a lower blade diameter acquisition unit that acquires the diameter of the lower blade, and an upper blade diameter acquisition unit Using the upper blade diameter and the lower blade diameter acquired by the lower blade diameter acquisition unit, the overlap amount maintaining unit for maintaining the overlap amount in the vertical direction between the upper blade and the lower blade at a predetermined amount, and the upper blade diameter Using the diameter of the upper blade acquired by the acquisition unit and the diameter of the lower blade acquired by the lower blade diameter acquisition unit, the peripheral speed that maintains the peripheral speed ratio between the peripheral speed of the upper blade and the peripheral speed of the lower blade at a predetermined ratio A ratio maintaining unit.

  This cutting device can keep the overlap amount constant and keep the peripheral speed ratio constant even when the diameter of at least one of the upper blade and the lower blade becomes smaller due to wear of the blade edge. Thereby, generation | occurrence | production of the burr | flash etc. of the cut surface of a strip | belt-shaped electrode can be suppressed, and cutting quality can be maintained.

  The peripheral speed ratio maintaining unit of the cutting device according to the embodiment includes an upper blade servomotor for rotationally driving the upper blade and a lower blade servomotor for rotationally driving the lower blade. As described above, by using the servo motor for the rotational drive of the upper blade and the lower blade, the rotational speed (and consequently the peripheral speed) of the upper blade and the lower blade can be easily and accurately adjusted to the target speed.

  According to the present invention, cutting quality can be maintained.

It is a figure showing typically the composition of the cutting device concerning one embodiment. It is a block diagram which shows the control structure of the cutting device shown in FIG.

  Hereinafter, a cutting apparatus according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

  A cutting device according to an embodiment is incorporated in a production line of an electrode used for a battery, and is used in a slit process for cutting an end portion (ear portion) of a strip-shaped electrode in which an active material layer is formed on a strip-shaped metal foil. . This cutting device is a shear-cut type slitter, and cuts at the overlapping portion of the upper blade of the round blade and the lower blade of the round blade. The manufactured electrode is used for a power storage device such as a secondary battery or an electric double layer capacitor. The secondary battery is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. Moreover, the manufactured electrode may be used for a primary battery. In this embodiment, it is assumed that an electrode used for a lithium ion secondary battery is manufactured.

  The electrode has an active material layer formed by applying an electrode paste on at least one of the front and back surfaces of the metal foil, and also has a tab on which the electrode paste is not applied. The metal foil is, for example, a copper foil or an aluminum foil. The electrode paste contains an active material, a binder, a solvent, and the like. The active material may be either a positive electrode active material or a negative electrode active material. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. The composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium. Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ≦ x ≦ 1.5). ) And the like, and boron-added carbon. The binder is, for example, a fluorine-containing resin such as polyvinylidene fluoride, polytetrafluoroethylene, or fluorine rubber, a thermoplastic resin such as polypropylene or polyethylene, an imide resin such as polyimide or polyamideimide, or an alkoxysilanol group-containing resin. Examples of the solvent include organic solvents such as NMP (N-methylpyrrolidone), methanol, and methyl isobutyl ketone, and water. The electrode paste may contain a conductive auxiliary such as carbon black, graphite, acetylene black, and ketjen black (registered trademark). The electrode paste may contain a thickening agent such as carboxymethylcellulose (CMC).

  When manufacturing an electrode, the above-mentioned substances are kneaded to form an electrode paste, the electrode paste is applied to a strip-shaped metal foil, the coated electrode paste is dried, etc. A strip electrode having an active material layer formed on a foil is generated. Furthermore, each electrode is cut out from the strip electrode by a slitting process for removing both end portions of the strip electrode and a process for punching the electrode from the strip electrode. In addition to the above steps, there are other steps such as pressing, baking, and inspection as steps for manufacturing the electrode.

  With reference to FIG.1 and FIG.2, the cutting device 1 which concerns on one Embodiment is demonstrated. FIG. 1 is a diagram schematically showing the configuration of the cutting device 1. FIG. 2 is a block diagram illustrating a control configuration of the cutting device 1.

  The cutting device 1 sandwiches the strip electrode E from above and below between the upper blade 10 and the lower blade 11 arranged along the transport direction D, and the upper blade 10 and the lower blade 11 rotate to rotate the strip electrode E being transported. The end of is continuously cut. In particular, the cutting device 1 keeps the overlap amount L and the peripheral speed ratio between the upper blade 10 and the lower blade 11 constant in order to maintain the cutting quality. Note that the cutting device 1 may be a device that uses two sets of the upper blade 10 and the lower blade 11 to cut the ends on both sides of the strip electrode E at one time, or uses one set of the upper blade 10 and the lower blade 11. The apparatus which cut | disconnects the edge part of the one side of the strip electrode E may be sufficient. The end portions of the strip electrode E to be cut are located at both ends in the width direction orthogonal to the longitudinal direction of the strip electrode E, respectively, and the uncoated portion where the active material layer is not coated (portion not used as an electrode) It is.

  Before conveyance, the strip electrode E is wound around the unwinding roll 2 in a roll shape. During conveyance, the belt-like electrode E is sequentially sent out from the unwinding roll 2 and taken up by the winding roll 3. The upper blade 10 and the lower blade 11 of the cutting device 1 are disposed in the middle of the conveyance path. A predetermined tension (tension) is applied to the belt-like electrode E being conveyed. As the conveyance speed, a speed suitable for cutting by the cutting device 1 is set.

  The cutting device 1 includes an upper blade 10, a lower blade 11, an upper blade sensor 20, a lower blade sensor 21, an upper blade lifting servo motor 30, a lower blade lifting servo motor 31, an upper blade driving servo motor 32, a lower blade A blade driving servomotor 33, a control device 40, and the like are provided.

  The upper blade 10 sandwiches the belt-like electrode E being conveyed between the lower blade 11 and is disposed so as to face the upper side of the lower blade 11. The upper blade 10 is attached to the rotary shaft 10a and rotates according to the rotation of the rotary shaft 10a. The upper blade 10 (rotating shaft 10a) rotates in a predetermined direction R0 according to the transport direction D of the strip electrode E. The rotating shaft 10a is arranged in a direction orthogonal to the transport direction D of the strip electrode E. The upper blade 10 is a disk-shaped round blade. The cutting edge of the upper blade 10 is a single blade and has an acute angle. The vertical position of the upper blade 10 is adjusted so that the blade edge of the upper blade 10 is positioned slightly below the belt-like electrode E being conveyed.

  The lower blade 11 sandwiches the belt-like electrode E being conveyed between the upper blade 10 and is disposed so as to face the lower side of the upper blade 10. The lower blade 11 is attached to the rotation shaft 11a and rotates according to the rotation of the rotation shaft 11a. The lower blade 11 (rotating shaft 11a) rotates in a predetermined direction R1 (the direction opposite to the rotation direction R0 of the upper blade 10) according to the transport direction D of the strip electrode E. The rotating shaft 11a is arranged in a direction orthogonal to the transport direction D of the strip electrode E. The lower blade 11 is a cylindrical or columnar round blade. The cutting edge of the lower blade 11 is substantially perpendicular. The vertical position of the lower blade 11 is adjusted so that the cutting edge of the lower blade 11 is positioned slightly above the belt-like electrode E being conveyed.

  As shown in FIG. 1, the overlap amount L between the upper blade 10 and the lower blade 11 is the maximum amount in the vertical direction of the portion where the blade edge of the upper blade 10 and the blade edge of the lower blade 11 overlap. If the overlap amount L is too large, the cutting quality will be reduced, such as the occurrence of burrs on the cut surface and an increase in chips from the cut surface. If the overlap amount L is too small, the upper blade 10 and the lower blade 11 will It causes cutting failure such as contact failure. Accordingly, the cutting device 1 has a target overlap amount (corresponding to a predetermined amount described in the claims), and the upper blade 10 is set so that the actual overlap amount L maintains the target overlap amount. The vertical position and the vertical position of the lower blade 11 are automatically adjusted. The target overlap amount is set by, for example, a cutting experiment by the cutting device 1 or the like.

  The peripheral speed ratio between the upper blade 10 and the lower blade 11 is a ratio between the peripheral speed V0 of the upper blade 10 and the peripheral speed V1 of the lower blade 11. The peripheral speeds V0 and V1 are speeds at the maximum radius position of the rotating round blades (upper blade 10 and lower blade 11) as shown in FIG. Therefore, even if the rotational speeds of the upper blade 10 and the lower blade 11 are kept constant, the peripheral speeds V0 and V1 are reduced when the diameters of the upper blade 10 and the lower blade 11 are reduced. The peripheral speed V0 of the upper blade 10 and the peripheral speed V1 of the lower blade 11 are the same speed, and the target peripheral speed is set according to the conveyance speed of the strip electrode E. Therefore, the target peripheral speed ratio (corresponding to the predetermined ratio described in the claims) is 1. If the peripheral speed ratio deviates from the target peripheral speed ratio (if at least one of the peripheral speed V0 and the peripheral speed V1 is not maintained at the target peripheral speed), the cutting quality such as the generation of burrs on the cut surface is reduced. Invite. Therefore, the cutting device 1 automatically sets the rotational speed of the upper blade 10 (circumferential speed V0) and the rotational speed of the lower blade 11 (circumferential speed V1) so that the actual peripheral speed ratio maintains the target peripheral speed (= 1). Adjust with.

  The upper blade sensor 20 is a sensor that detects the tip position of the upper blade 10 (for example, the tip position at the upper end). When detecting the tip position of the upper blade 10, the upper blade sensor 20 transmits the tip position information to the control device 40. The lower blade sensor 21 is a sensor that detects the tip position of the lower blade 11 (for example, the tip position at the lower end). When detecting the tip position of the lower blade 11, the lower blade sensor 21 transmits the tip position information to the control device 40. As each sensor 20 and 21, for example, a non-contact type laser displacement sensor is used.

  The upper blade raising / lowering servomotor 30 is a servomotor for raising and lowering the upper blade 10. In particular, the upper blade lifting servo motor 30 is used when the vertical position of the upper blade 10 is automatically adjusted. The upper blade lifting servo motor 30 has a servo mechanism that automatically controls at least the rotation angle of the motor, and the motor is controlled by this servo mechanism. When the servo motor 30 for raising and lowering the upper blade receives a control command including the rotation direction and the target rotation angle from the control device 40, the motor is rotated so that the actual rotation angle in the rotation direction becomes the target rotation angle. In order to raise and lower the upper blade 10 in accordance with the rotation of the drive shaft of the upper blade raising / lowering servomotor 30, the rotation of the drive shaft is increased between the drive shaft of the upper blade raising / lowering servomotor 30 and the upper blade 10. A mechanism (not shown) for converting the blade 10 into vertical movement is provided.

  The lower blade raising / lowering servomotor 31 is a servomotor for raising and lowering the lower blade 11. In particular, the lower blade raising / lowering servomotor 31 is used when the vertical position of the lower blade 11 is automatically adjusted. The lower blade lifting / lowering servomotor 31 is the same servomotor as the upper blade lifting / lowering servomotor 30. A mechanism (not shown) for converting the rotation of the drive shaft into the vertical movement of the lower blade 11 is also provided between the drive shaft of the lower blade lifting servomotor 31 and the lower blade 11.

  The upper blade drive servo motor 32 is a servo motor for rotationally driving the upper blade 10. In particular, the upper blade drive servomotor 32 is used when the rotational speed of the upper blade 10 is automatically adjusted. The upper blade driving servo motor 32 has a servo mechanism that automatically controls at least the rotational speed of the motor, and controls the motor by this servo mechanism. When the upper blade driving servomotor 32 receives a control command including the target rotation speed from the control device 40, the upper blade driving servomotor 32 rotates the motor so that the actual rotation speed becomes the target rotation speed. In order to rotate the rotating shaft 10a of the upper blade 10 in accordance with the rotation of the driving shaft of the upper blade driving servo motor 32, between the driving shaft of the upper blade driving servo motor 32 and the rotating shaft 10a of the upper blade 10. Is provided with a mechanism (not shown) for transmitting the rotation of the drive shaft to the rotary shaft 10a. In this embodiment, the upper blade drive servomotor 32 corresponds to the upper blade servomotor described in the claims.

  The lower blade driving servomotor 33 is a servomotor for driving the lower blade 11 to rotate. In particular, the lower blade driving servomotor 33 is used when the rotational speed of the lower blade 11 is automatically adjusted. The lower blade driving servo motor 33 is a servo motor similar to the upper blade driving servo motor 32. A mechanism (not shown) for transmitting the rotation of the drive shaft to the rotation shaft 11 a is also provided between the drive shaft of the lower blade drive servomotor 33 and the rotation shaft 11 a of the lower blade 11. In this embodiment, the lower blade driving servomotor 33 corresponds to the lower blade servomotor described in the claims.

  Each servo motor 30 to 33 has a detector for detecting the state of the motor in order to perform feedback control in the servo mechanism. This detector detects the actual rotation angle, actual rotation speed, and the like of the motor. As the detector, for example, an encoder is used.

  The control device 40 is an electronic control device for controlling the cutting device 1 and includes a memory such as a CPU [Central Processing Unit], a ROM [Read Only Memory], and a RAM [Random Access Memory], an input / output circuit, and the like. The control device 40 loads an application program stored in the ROM into the RAM and executes it by the CPU, whereby the upper blade diameter calculator 41, the lower blade diameter calculator 42, the upper blade lifting distance calculator 43, and the lower blade lift The distance calculator 44, the upper blade lift controller 45, the lower blade lift controller 46, the upper blade peripheral speed calculator 47, the lower blade peripheral speed calculator 48, the upper blade drive controller 49, and the lower blade drive controller 50 are configured. Is done. The control device 40 receives detection information from the sensors 20 and 21. And in the control apparatus 40, each part 41-50 is processed using this each detection information, and a control command is transmitted to each servomotor 30-33 as needed.

  The upper blade diameter calculator 41 calculates the diameter of the upper blade 10 using the tip position of the upper blade 10 detected by the upper blade sensor 20. As this calculation method, for example, the radius of the upper blade 10 is calculated from the difference between the vertical position of the rotation axis 10a of the upper blade 10 and the tip position at the upper end of the upper blade 10, and this radius is doubled. The diameter of the upper blade 10 is calculated. The vertical position of the rotary shaft 10a is a reference position set at the time of shipment of the cutting device 1 when the vertical position of the upper blade 10 has never been adjusted, and the vertical position is adjusted. In the case where the upper blade 10 is moved up and down, the reference position is taken into account. The reference position is, for example, the position of the upper blade 10 in the vertical direction so that the tip position of the lower end of the upper blade 10 is lower than the position of the strip electrode E by approximately one half of the target overlap amount. This is the center position of the rotating shaft 10a when set. In this embodiment, the upper blade sensor 20 and the upper blade diameter calculation unit 41 correspond to the upper blade diameter acquisition unit described in the claims.

  The lower blade diameter calculator 42 calculates the diameter of the lower blade 11 using the tip position of the lower blade 11 detected by the lower blade sensor 21. This calculation method is the same method as that for the upper blade diameter calculation unit 41 described above. In this embodiment, the lower blade sensor 21 and the lower blade diameter calculator 42 correspond to a lower blade diameter acquisition unit described in the claims.

  The upper blade lifting distance calculator 43 determines whether the diameter (for example, diameter) of the upper blade 10 calculated by the upper blade diameter calculator 41 is smaller than the previous value of the diameter of the upper blade 10. As this determination method, for example, a threshold value is set in consideration of the detection error of the upper blade sensor 20, the minimum lifting distance that allows the upper blade 10 to be raised and lowered, and it is determined whether or not the threshold value is smaller than this threshold value. Good. The previous value of the diameter of the upper blade 10 is the diameter of the upper blade 10 at the time of shipment of the cutting device 1 when the vertical position of the upper blade 10 has never been adjusted, and the vertical position is adjusted. If it is, it is the diameter of the upper blade 10 when it was adjusted last time. When the diameter of the upper blade 10 is smaller than the previous value (in this case, the blade edge is worn and the diameter is smaller), the upper blade lifting distance calculation unit 43 is over the upper blade 10 and the lower blade 11. The elevation distance of the upper blade 10 necessary for the lap amount L to be the target overlap amount is calculated. As the calculation method, for example, the upper end necessary for the tip end position of the lower end of the upper blade 10 having a reduced diameter to be a position lower than the position of the strip electrode E by approximately one half of the target overlap amount. The lifting distance of the blade 10 may be calculated, or the lifting distance of the upper blade 10 is calculated from the difference between the diameter of the upper blade 10 calculated by the upper blade diameter calculation unit 41 and the previous value of the diameter of the upper blade 10. You may calculate. In the case of the upper blade 10, it is the upward / downward moving distance.

  The lower blade lifting distance calculation unit 44 determines whether the diameter of the lower blade 11 calculated by the lower blade diameter calculation unit 42 is smaller than the previous value of the diameter of the lower blade 11. This determination method is the same determination method as the upper blade lifting distance calculation unit 43. When the diameter of the lower blade 11 becomes smaller than the previous value, the lower blade lifting distance calculating unit 44 is necessary for the overlap amount L between the upper blade 10 and the lower blade 11 to be the target overlap amount. 11 lift distances are calculated. This calculation method is the same calculation method as the upper blade lifting distance calculation unit 43. In the case of the lower blade 11, it is the upward / downward moving distance.

  The upper blade lifting control unit 45 determines the rotation direction of the upper blade lifting servomotor 30 for lowering the upper blade 10 when the lifting distance of the upper blade 10 is calculated by the upper blade lifting distance calculation unit 43 and the upper blade. The target rotation angle of the upper blade lifting servomotor 30 for lowering 10 by the lifting distance is calculated. Then, the upper blade lifting control unit 45 transmits a control command including the rotation direction and the target rotation angle to the upper blade lifting servomotor 30.

  The lower blade raising / lowering control unit 46 determines the rotation direction of the lower blade raising / lowering servo motor 31 that raises the lower blade 11 when the lower blade raising / lowering distance calculating unit 44 calculates the raising / lowering distance of the lower blade 11 and lower blades. The target rotation angle of the lower blade raising / lowering servomotor 31 for raising 11 by the raising / lowering distance is calculated. Then, the lower blade raising / lowering control unit 46 transmits a control command including the rotation direction and the target rotation angle to the lower blade raising / lowering servomotor 31.

  In this embodiment, the upper blade lifting servo motor 30, the lower blade lifting servo motor 31, the upper blade lifting distance calculation unit 43, the lower blade lifting distance calculation unit 44, the upper blade lifting control unit 45, and the lower blade lifting control. The part 46 corresponds to an overlap amount maintaining part described in the claims.

  The upper blade peripheral speed calculation unit 47 calculates the peripheral speed V0 of the upper blade 10 using the diameter (particularly the radius) of the upper blade 10 calculated by the upper blade diameter calculation unit 41 and the rotational speed of the upper blade 10. For example, the rotational speed of the upper blade 10 may be obtained by conversion from the rotational speed of the servo motor 32 for driving the upper blade, or a sensor for detecting the rotational speed of the upper blade 10 is provided. It may be obtained from the detected value.

  The lower blade peripheral speed calculator 48 calculates the peripheral speed V1 of the lower blade 11 using the diameter of the lower blade 11 calculated by the lower blade diameter calculator 42 and the rotational speed of the lower blade 11. The rotational speed of the lower blade 11 can be obtained by the same method described in the upper blade peripheral speed calculation unit 47 described above.

  The upper blade drive controller 49 determines whether or not the peripheral speed V0 of the upper blade 10 calculated by the upper blade peripheral speed calculator 47 is maintained at the target peripheral speed. As this determination method, for example, a threshold value is set in consideration of a detection error of the upper blade sensor 20, a minimum rotation speed capable of changing the rotation speed of the upper blade 10, and the like. It may be determined whether or not the difference between the two is equal to or greater than a threshold value. When the peripheral speed V0 of the upper blade 10 is not maintained at the target peripheral speed, the upper blade drive control unit 49 uses the diameter (particularly, the radius) of the upper blade 10 calculated by the upper blade diameter calculation unit 41, The target rotational speed of the upper blade 10 necessary for the peripheral speed V0 of the upper blade 10 to become the target peripheral speed is calculated. Further, the upper blade drive control unit 49 calculates the target rotational speed of the servo motor 32 for driving the upper blade for achieving the target rotational speed of the upper blade 10. Then, the upper blade drive control unit 49 transmits a control command including the target rotation speed to the upper blade drive servo motor 32. When the peripheral speed V0 of the upper blade 10 is maintained at the target peripheral speed, the target rotational speed of the upper blade driving servomotor 32 is maintained.

  The lower blade drive control unit 50 determines whether or not the peripheral speed V1 of the lower blade 11 calculated by the lower blade peripheral speed calculation unit 48 is maintained at the target peripheral speed. This determination method is the same determination method as the upper blade drive control unit 49. When the peripheral speed V1 of the lower blade 11 is not maintained at the target peripheral speed, the lower blade drive control unit 50 uses the diameter of the lower blade 11 calculated by the lower blade diameter calculation unit 42 to The target rotational speed of the lower blade 11 necessary for the speed V1 to become the target peripheral speed is calculated. Further, the lower blade drive control unit 50 calculates a target rotational speed of the lower blade driving servomotor 33 for achieving the target rotational speed of the lower blade 11. Then, the lower blade drive control unit 50 transmits a control command including the target rotational speed to the lower blade drive servomotor 33. When the peripheral speed V1 of the lower blade 11 is maintained at the target peripheral speed, the target rotational speed of the lower blade driving servomotor 33 is maintained.

  By maintaining the peripheral speed V0 of the upper blade 10 at the target peripheral speed and the peripheral speed V1 of the lower blade 11 at the target peripheral speed, the peripheral speed ratio between the upper blade 10 and the lower blade 11 becomes the target peripheral speed ratio. (= 1). In this embodiment, the upper blade drive servo motor 32, the lower blade drive servo motor 33, the upper blade peripheral speed calculation unit 47, the lower blade peripheral speed calculation unit 48, the upper blade drive control unit 49, and the lower blade drive control. The part 50 corresponds to the peripheral speed ratio maintaining part described in the claims.

  The operation of the cutting device 1 having the above configuration will be described. The strip electrode E is transported in the transport direction D between the unwinding roll 2 and the winding roll 3. In the cutting device 1, the upper blade 10 rotates in the rotation direction R0 and the lower blade 11 rotates in the rotation direction R1, and continuously cuts the end of the belt-like electrode E being conveyed. As the upper blade 10 and the lower blade 11 of the round blade are used for cutting, the cutting edge wears and the diameter decreases. In particular, the upper blade 10 is easily worn because it has a sharp edge.

  In particular, the upper blade sensor 20 detects the tip position of the rotating upper blade 10 at regular intervals, and transmits the tip position information to the control device 40. The control device 40 receives the tip position information and calculates the diameter of the upper blade 10 using the tip position information. Further, the lower blade sensor 21 detects the tip position of the rotating lower blade 11 at regular intervals, and transmits the tip position information to the control device 40. The control device 40 receives the tip position information and calculates the diameter of the lower blade 11 using the tip position information.

  Each time the diameters of the blades 10 and 11 are calculated, the control device 40 determines whether or not the diameter of the upper blade 10 has decreased and determines whether or not the diameter of the lower blade 11 has decreased. When the diameter of the upper blade 10 is small, the control device 40 calculates the upward / downward moving distance of the upper blade 10 for maintaining the target overlap amount. Then, the control device 40 calculates the target rotation angle of the upper blade lifting servomotor 30 from this lifting distance, and sends a control command consisting of this target rotation angle and the rotation direction for lowering the upper blade 10 to the upper blade lifting servo. Transmit to the motor 30. Upon receiving this control command, the upper blade lifting servomotor 30 controls the rotation of the motor so as to rotate in the rotation direction by the target rotation angle. As a result, the position of the upper blade 10 in the vertical direction is lowered by the elevation distance. On the other hand, when the diameter of the lower blade 11 is small, the control device 40 calculates the upward / downward moving distance of the lower blade 11 to maintain the target overlap amount. Then, the control device 40 calculates the target rotation angle of the lower blade lifting servomotor 31 from this lifting distance, and sends a control command consisting of this target rotation angle and the rotation direction for raising the lower blade 11 to the lower blade lifting servo. Transmit to the motor 31. When the lower blade lifting / lowering servomotor 31 receives this control command, the lower blade lifting / lowering servomotor 31 controls the rotation of the motor so as to rotate in the rotation direction by the target rotation angle. As a result, the vertical position of the lower blade 11 is increased by the ascending / descending distance. By adjusting the vertical position of the upper blade 10 or adjusting the vertical position of the lower blade 11, the overlap amount L between the upper blade 10 and the lower blade 11 is maintained at the target overlap amount.

  Further, the control device 40 calculates the peripheral speed V0 of the upper blade 10 from the diameter of the upper blade 10, and calculates the peripheral speed V1 of the lower blade 11 from the diameter of the lower blade 11. The control device 40 determines whether or not the peripheral speed V0 of the upper blade 10 is maintained at the target peripheral speed, and determines whether or not the peripheral speed V1 of the lower blade 11 is maintained at the target peripheral speed. To do. When the peripheral speed V0 of the upper blade 10 is not maintained at the target peripheral speed, the control device 40 calculates the target rotational speed of the upper blade 10 for maintaining the target peripheral speed, and the target rotational speed of the upper blade 10 is calculated. Then, the target rotational speed of the upper blade driving servomotor 32 is calculated, and a control command comprising this target rotational speed is transmitted to the upper blade driving servomotor 32. Upon receiving this control command, the upper blade drive servomotor 32 controls the rotation of the motor so that the rotation speed becomes the target rotation speed. Thereby, the rotational speed of the upper blade 10 becomes the target rotational speed, and the peripheral speed V0 of the upper blade 10 becomes the target peripheral speed. When the peripheral speed V1 of the lower blade 11 is not maintained at the target peripheral speed, the control device 40 calculates the target rotational speed of the lower blade 11 for maintaining the target peripheral speed, and the target rotational speed of the lower blade 11 is calculated. Then, the target rotational speed of the lower blade driving servomotor 33 is calculated, and a control command comprising this target rotational speed is transmitted to the lower blade driving servomotor 33. When the lower blade drive servomotor 33 receives this control command, it controls the rotation of the motor so that the rotation speed becomes the target rotation speed. Thereby, the rotational speed of the lower blade 11 becomes the target rotational speed, and the peripheral speed V1 of the lower blade 11 becomes the target peripheral speed. By adjusting the peripheral speed V0 of the upper blade 10 or the peripheral speed V1 of the lower blade 11, the peripheral speed ratio between the upper blade 10 and the lower blade 11 is maintained at the target peripheral speed ratio.

  According to this cutting device 1, even when at least one of the diameters of the upper blade 10 and the lower blade 11 becomes smaller due to wear of the blade edge, the overlap amount L is kept constant and the peripheral speed ratio is kept constant. Can do. Therefore, the cutting state by the upper blade 10 and the lower blade 11 can be always kept in an appropriate state with respect to the strip electrode E transported at a constant transport speed. As a result, the generation of burrs on the cut surface of the strip electrode E can be suppressed, and the cutting quality can be maintained.

  According to the cutting device 1, by using the servo motors 32 and 33 for rotational driving of the upper blade 10 and the lower blade 11, the rotational speed (and consequently the peripheral speed) of the upper blade 10 and the lower blade 11 can be easily set to the target speed. It can be adjusted with high accuracy. Further, according to the cutting device 1, by using the servo motors 30 and 31 for raising and lowering the upper blade 10 and the lower blade 11, the vertical positions of the upper blade 10 and the lower blade 11 can be easily and accurately set to the target positions. Can be adjusted.

  As mentioned above, although embodiment of this invention was described, it is implemented in various forms, without being limited to the said embodiment.

  For example, in the above embodiment, it is applied to the case where the end portion of the strip electrode is cut in the longitudinal direction. However, when the center portion of the two strip strip electrode is cut in the longitudinal direction, for each electrode of the strip electrode of intermittent coating The present invention may be applied when cutting in the width direction.

  In the above embodiment, the upper blade having a sharp edge and the lower blade having a substantially right edge are combined with each other. However, the combination of the upper blade and the lower blade is not particularly limited. Both blades may be single blades with sharp edges.

  Moreover, in the said embodiment, since the blade edge used the substantially right-angled lower blade, the blade edge of a lower blade is hard to wear. Therefore, the possibility that the diameter of the lower blade is reduced is low. Therefore, in order to keep the overlap amount constant, only the upper blade may be adjusted in the vertical position. Further, in order to keep the peripheral speed ratio constant, only the upper blade may be configured to adjust the rotational speed (peripheral speed). When it is set as such a structure, the structure of a cutting device can be simplified.

  DESCRIPTION OF SYMBOLS 1 ... Cutting device, 2 ... Unwinding roll, 3 ... Winding roll, 10 ... Upper blade, 10a ... Rotary shaft, 11 ... Lower blade, 11a ... Rotary shaft, 20 ... Sensor for upper blade, 21 ... Sensor for lower blade 30 ... Servo motor for raising / lowering the upper blade, 31 ... Servo motor for raising / lowering the lower blade, 32 ... Servo motor for driving the upper blade, 33 ... Servo motor for driving the lower blade, 40 ... Control device, 41 ... Upper blade diameter calculating section, 42 ... Lower blade diameter calculation unit, 43 ... Upper blade lifting distance calculation unit, 44 ... Lower blade lifting distance calculation unit, 45 ... Upper blade lifting control unit, 46 ... Lower blade lifting control unit, 47 ... Upper blade circumferential speed calculation unit 48 ... Lower blade peripheral speed calculation unit, 49 ... Upper blade drive control unit, 50 ... Lower blade drive control unit.

Claims (2)

Cutting that includes an upper blade of a round blade and a lower blade of a round blade, and cuts a strip electrode in which an active material layer is formed on a strip-shaped metal foil at an overlapping portion of the upper blade and the lower blade A device,
An upper blade diameter acquisition unit for acquiring the diameter of the upper blade;
A lower blade diameter acquisition unit for acquiring the diameter of the lower blade;
Using the diameter of the upper blade acquired by the upper blade diameter acquisition unit and the diameter of the lower blade acquired by the lower blade diameter acquisition unit, the overlap amount in the vertical direction between the upper blade and the lower blade is determined. An overlap amount maintaining unit to maintain a fixed amount;
Using the diameter of the upper blade acquired by the upper blade diameter acquisition unit and the diameter of the lower blade acquired by the lower blade diameter acquisition unit, the peripheral speed between the peripheral speed of the upper blade and the peripheral speed of the lower blade A peripheral speed ratio maintaining unit for maintaining the ratio at a predetermined ratio;
A cutting device comprising: The peripheral speed ratio maintaining unit is
An upper blade servomotor for rotationally driving the upper blade;
A lower blade servomotor for rotationally driving the lower blade;
The cutting device according to claim 1, comprising:

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