Web Winding Device

Abstract

To provide a web winding device which sets a distance between a static electricity application device and a core and an applied voltage of the static electricity application device to appropriate values, depending on the type of the core or the winding speed of the core, and reliably adsorbs a web to the core.SOLUTION: A web winding device comprises: a turret; a nip roller; a cutter for cutting a web; a static electricity application device which generates static electricity in vicinity of a new core; and a contact member which charges the whole of the new core with a polarity opposite to that of the web. When a resistance value of the new core in the range of 107 to 109 Ω and winding speed of the new core is about 80 to 120 m / min, the static electricity application device is located with respect to the new core so that a shortest distance between a tip of a discharge needle and an outer peripheral surface of the new core becomes 20 mm or more, and an applied voltage by the static electricity application device is set to 18 to 30kV.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a web winding device, and more particularly to a web winding device capable of reliably adsorbing an end of a cut web onto a tapeless winding core. [Background technology]

[0002] Conventionally, web winding devices have been proposed that continuously unwind a web made of synthetic resin such as PET (polyethylene terephthalate), OP (biaxially oriented polypropylene film), or CP (cellulose propionate), print or coat the web, and then wind the web up into a roll again.

[0003] For example, Patent Document 1 discloses a web winding device that continuously winds up a web into a roll by automatically switching between winding cores without stopping the production line. The web winding device of Patent Document 1 employs a tapeless winding core, and is configured to wind the web around the winding core by utilizing static electricity.

[0004] In the web winding device of Patent Document 1, when a web is wound onto a new tapeless core, the web being transported is clamped at a clamping position between the core and a nip roller. At a position downstream of the clamping position, the cutting blade of the cutter rotates at a circumferential speed faster than the circumferential speed of the surface of the core, and the web is cut. Then, the tip of the cut end of the web is pressed against the core by the brush body, and the tip of the cut end is wound around the core.

[0005] In Patent Document 1, a static electricity applying device is disposed near the entrance side of the clamping position. Negative ions generated by the static electricity applying device are carried by the air flow on the surfaces of both the web and the core to the clamping position and are sandwiched between the web and the core. The web and the core are then negatively charged.

[0006] In addition, in Patent Document 1, a brush body is disposed near the exit side of the clamping position. The brush body is made of a bundle of fine needle-like or fibrous conductive members and is earthed, and functions as a static eliminator that removes static electricity.

[0007] It is disclosed that by employing the above-mentioned configuration, the web and the new core can be charged, and an adhesive force of the web to the new core can be obtained. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2018-193194 A Summary of the Invention [Problem to be solved by the invention]

[0009] The resistance value (difficulty of electric current flow) of the above-mentioned winding core varies greatly depending on the type (material). For example, the resistance value of a winding core made of paper is 10 7 ~10 9 The resistance of the winding core made of metal is about 10 -8 ~10 -7 The core winding speed varies depending on the production line, and may be set to, for example, 100 meters per minute (m / min) or 200 meters per minute.

[0010] Therefore, if the distance between the static electricity applicator and the core (specifically, the shortest distance between the tip of the discharge needle of the static electricity applicator and the outer circumference of the core) and the applied voltage of the static electricity applicator are fixed (always the same value), the core may not be sufficiently charged. If the core cannot be sufficiently charged, the web cannot be reliably attracted to the core.

[0011] Therefore, an object of the present invention is to provide a web winding device that can set the distance between the electrostatic charger and the winding core and the applied voltage of the electrostatic charger to appropriate values ​​depending on the type of winding core and the winding speed of the winding core, thereby enabling the web to be reliably attracted to the winding core. [Means for solving the problem]

[0012] In order to achieve the above object, a web winding device according to the present invention comprises: A web winding device that continuously winds a web into a roll while alternately switching between winding cores, a turret having a pair of shaft support parts that individually mount the winding cores and control their rotation, and that exchanges the position of the winding cores between a winding position where the web is wound and a standby position where the winding cores are exchanged; a nip roller that, when switching, advances to the vicinity of a new core that is the core before winding and is located at the winding position, thereby nipping the web that is wound around the core that is located at the standby position and running between the new core and the nip roller; a cutter that cuts the web at a position downstream away from a clamping position where the nip roller and the new winding core clamp the web; a static electricity applying device that includes a discharge needle and applies a voltage to the discharge needle to generate static electricity in the vicinity of the new winding core, which is a grounded conductor; a grounded contact member that contacts a portion of the new winding core that is charged to the same polarity as the web, thereby charging the entire new winding core to a polarity opposite to that of the web; Equipped with the contact member is disposed on the outlet side of a position where the web contacts the new winding core, The resistance of the new core is 10 7 ~10 9 When the winding speed of the new winding core is in the range of about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance between the tip of the discharge needle and the outer peripheral surface of the new winding core is 20 mm, and the voltage applied by the static electricity applying device is set to 18 to 30 kV.

[0013] In addition, the resistance value is 10 7 ~10 9 When the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 26 to 30 kV. This may also be the case.

[0014] In addition, the resistance value is 10 -1 ~10 1 When the winding speed is about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 15 to 25 kV. This may also be the case.

[0015] In addition, the resistance value is 10 -1 ~10 1 When the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 20 to 25 kV. This may also be the case.

[0016] In addition, the resistance value is 10 -8 ~10 -7 When the winding speed is about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 10 to 20 kV. This may also be the case.

[0017] In addition, the resistance value is 10 -8 ~10 -7 When the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 15 to 20 kV. This may also be the case.

[0018] The cutter further comprises: A rotating arm having a base end portion rotatably supported; a cutting blade attached to a tip end of the rotating arm and cutting through a surface of the web as the rotating arm rotates; an elastically deformable brush body attached to a tip end of the rotating arm and contacting an end of the web cut by the cutting blade and pressed against the new core; The brush body is conductive and grounded to function as the contact member. This may also be the case. Effect of the Invention

[0019] According to the web winding device of the present invention, the distance between the electrostatic charge imparting device and the winding core and the applied voltage of the electrostatic charge imparting device can be set to appropriate values ​​depending on the type of winding core and the winding speed of the winding core, so that the web can be reliably attracted to the winding core. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic diagram showing a web winding device according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a diagram for explaining the positional relationship between a core and a static electricity applying device. [Diagram 3] FIG. 2 is a diagram showing a negatively charged core and a web exhibiting a negative polarity. [Figure 4] FIG. 4 is a diagram showing a state immediately after the web is cut by a cutting blade. [Diagram 5] 11 is a diagram showing how the tip of the cut end of the web is brought closer to the winding core by the brush body. FIG. [Figure 6] 13 is a diagram showing a state in which the brush body is pressed against the winding core with the web sandwiched therebetween. FIG. [Figure 7] 13 is a diagram showing the charged state of the winding core after the grounded brush body comes into contact with the winding core; FIG. [Figure 8] 11 is a diagram showing the polarity of the web and the charged state of the core when the web is attracted to the core; FIG. [Figure 9] FIG. 13 is a diagram showing a state in which a web attracted to a core passes between a static electricity applying device and the core. [Figure 10] 11 is a diagram showing the relationship between the resistance value of the winding core, the winding speed, the shortest distance between the discharge needle and the winding core, and the applied voltage. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (Embodiment) A web winding device according to an embodiment of the present invention will be described with reference to Figures 1 to 10. In the following, a web winding device 1 shown in Figure 1 will be described as an example of a web winding device according to the present invention.

[0022] The web winding device 1, like Patent Document 1 (Publication No. 2018-193194), is a device that continuously winds a web W made of synthetic resin, such as PET, OP, or CP, from a roll-shaped raw material, prints or coats the web W, and then winds it up into a roll again. The applicant of Patent Document 1 is the same as the applicant of the present application.

[0023] The web winding device 1 is used in the final process of a production line (not shown) for a so-called roll-to-roll type printing machine or coating machine. The web winding device 1 is configured to continuously wind up the web W into a roll while automatically switching between tapeless winding cores C alternately without stopping the production line.

[0024] 1, the web winding device 1 is configured to include a turret 3, a nip roller 5, a cutter 6, a near roller 8, a static electricity applying device 9, a dancer roller 11, and various guide rollers R. The basic structure of the web winding device 1 including these elements is similar to that of the web winding device according to Patent Document 1, and therefore, in the following, with regard to the web winding device 1, the same reference numerals are used for members having the same functions as those in Patent Document 1, and description thereof will be omitted.

[0025] In this embodiment, the static electricity applicator 9 is disposed at a position different from that of Patent Document 1. Specifically, as shown in Fig. 2, the static electricity applicator 9 of this embodiment is disposed at a position facing the cutter 6 with the web W sandwiched between them on the exit side of the clamping position NP. Specifically, the static electricity applicator 9 is disposed at a position as close as possible to the cutter 6 without coming into contact with the cutter 6 when the cutter 6 rotates. Note that in Patent Document 1, the static electricity applicator 9 is disposed near the entrance of the clamping position NP.

[0026] The static electricity applying device 9 is configured to include a horizontally long bar body 9a extending in the axial direction of the core C, and a plurality of discharge needles 9b arranged side by side at equal intervals on the bar body 9a. When a negative high voltage is applied to the plurality of discharge needles 9b, the plurality of discharge needles 9b generate negative ions.

[0027] 2, the nip roller 5 is a roller for nipping the web W being transported when the web W is wound around a new core C, by being pressed against the new core C via the web W. As will be described later, in this embodiment, the web W is attracted to the core C by using the principle of counter-electrode charging. Therefore, the core C is conductive and is grounded.

[0028] The cutter 6 is configured to include a rotating arm 64 rotatably supported at its base end, a cutting blade 63 attached to the tip end of the rotating arm 64, and a pair of brush bodies 70.

[0029] The cutting blade 63 is a member for cutting through the surface of the web W as the rotating arm 64 rotates.

[0030] The brush body 70 is an elastically deformable member extending in two rows along the cutting blade 63. The brush body 70 is an example of a contact member according to the present invention, and is pressed against the winding core C by pinching the tip portion of the cut end of the web W.

[0031] Specifically, the brush body 70 is made of a conductive metal material. More specifically, the brush body 70 is made by bundling together thin, needle-like or fibrous members (brush elements) made of stainless steel. The brush body 70 is grounded through the rotating arm 64.

[0032] As shown in Fig. 2, when a negative high voltage is applied to multiple discharge needles 9b in the static electricity applying device 9, the multiple discharge needles 9b generate (emit) negative ions. When negative ions are generated from the multiple discharge needles 9b, as shown in Fig. 3, the portion of the core C that the negative ions hit (the upper side in Fig. 3) becomes positively charged because a positive charge of the opposite polarity is attracted to it. On the other hand, the side of the core C opposite to the portion that the negative ions hit (the lower side in Fig. 3) becomes negatively charged.

[0033] Due to the position of the static electricity applying device 9, the web W is not exposed to the negative ions generated by the static electricity applying device 9. However, the web W, which is made of a film or the like, passes through various parts from the upstream device to the web winding device 1 before reaching the core C. Therefore, the web W is negatively charged due to peeling electrification, frictional electrification, and the like. Alternatively, a separate static electricity applying device 9' may be disposed upstream of the clamping position NP to negatively charge the web W. This allows the web W to be more strongly charged.

[0034] As shown in Fig. 4, when the rotating arm 64 rotates, the cutting blade 63 cuts through the surface of the web W, cutting the web W. After the web W is cut, when the rotating arm 64 rotates further, the brush body 70 comes into contact with the end of the web W, as shown in Fig. 5. Then, the end of the web W is gradually brought closer to the winding core C by the brush body 70.

[0035] 6, the web W is pressed against the core C by the brush body 70. At that time, the brush body 70 is pressed against the core C and elastically deforms.

[0036] 7, when the grounded brush body 70 comes into contact with the winding core C, a large amount of negative charges accumulated in the winding core C is transferred to the earth, generating a strong Coulomb force around the winding core C. As a result, the entire winding core C becomes positively charged.

[0037] 8, the negatively charged web W is pressed against the positively charged winding core C by the brush body 70. As a result, the web W is attracted to the winding core C by a strong Coulomb force.

[0038] The web W is an insulator, unlike the conductive winding core C. Therefore, even if the grounded brush body 70 comes into contact with the web W, the negative charge on the web W does not escape to the earth, and the web W maintains a negatively charged state.

[0039] As shown in Fig. 9, the web W attracted to the core C is wound up as the core C rotates. At that time, the web W passes between the tip of the discharge needle 9b and the outer circumferential surface of the core C. During the passage, the web W is electrostatically polarized by the electric field formed between the discharge needle 9b and the core C, and the web W adheres more closely to the core C. This increases the force of attraction of the web W to the core C.

[0040] In this embodiment, the shortest distance between the tip of each discharge needle 9b and the outer peripheral surface of the winding core C (hereinafter also referred to as the shortest distance DS) and the applied voltage (hereinafter also referred to as the applied voltage EP) applied to each discharge needle 9b are changed according to the type (resistance value) of the core used as the winding core C and the winding speed of the winding core C. This is because if the shortest distance DS and the applied voltage EP are set to a uniform value (fixed value), the web W may not be sufficiently attracted to the winding core C depending on the resistance value and winding speed of the winding core C.

[0041] Therefore, in this embodiment, the shortest distance DS and the applied voltage EP are set within the range of values ​​shown in Fig. 10 according to the resistance value and winding speed of the winding core C. Note that the shortest distance DS and the applied voltage EP shown in Fig. 10 are values ​​derived by the inventors of the present application through repeated demonstration experiments.

[0042] As shown in Figure 10, the resistance value of the dedicated resin-paper core is 10 7 ~10 9 Ω range. When a dedicated resin / paper core is used as the winding core C and the winding speed of the winding core C is set to 80 to 120 m / min (meters per minute), the shortest distance DS is set to 20 mm and the applied voltage EP is set to 18 to 30 kV (kilovolts). The shorter the shortest distance DS, the lower the applied voltage can be set, but if the discharge needle 9b is brought too close to the winding core C, sparks may occur or charging may become uneven. For this reason, in this embodiment, the shortest distance DS is set to 20 mm as the shortest distance at which sparks or charging unevenness do not occur. In this embodiment, the maximum voltage that can be applied is 30 kV.

[0043] In addition, when a dedicated resin / paper core is used as the winding core C and the winding speed of the winding core C is set to 180 to 220 m / min, the shortest distance DS is set to 20 mm and the applied voltage EP is set to 26 to 30 kV.

[0044] The paper core is made up of multiple layers, including an aluminum layer, and is therefore electrically conductive.

[0045] The resistance of the conductive paint core is 10 -1 ~10 1 In the case where a conductive paint core is used as the winding core C and the winding speed of the winding core C is set to 80 to 120 m / min, the shortest distance DS is set to 20 mm and the applied voltage EP is set to 15 to 25 kV.

[0046] Furthermore, when a conductive paint core is used as the winding core C and the winding speed of the winding core C is set to 180 to 220 m / min, the shortest distance DS is set to 20 mm and the applied voltage EP is set to 20 to 25 kV.

[0047] The resistance of the metal core is 10 -8 ~10 -7In the case where a metal core is used as the winding core C and the winding speed of the winding core C is set to 80 to 120 m / min, the shortest distance DS is set to 20 mm and the applied voltage EP is set to 10 to 20 kV.

[0048] Furthermore, when a metal core is used as the winding core C and the winding speed of the winding core C is set to 180 to 220 m / min, the shortest distance DS is set to 20 mm and the applied voltage EP is set to 15 to 20 kV.

[0049] According to the embodiment described above, the shortest distance DS and the applied voltage EP are set to appropriate values ​​(values ​​shown in FIG. 10 derived from demonstration experiments) according to the resistance value of the winding core C and the winding speed of the winding core C. This makes it possible to reliably charge the winding core C, and to more reliably attract the web W to the winding core C.

[0050] Furthermore, according to the above-described embodiment, the optimum values ​​of the shortest distance DS and the applied voltage EP are derived according to the resistance value of the winding core C, so that it is possible to adopt the optimum core as the winding core C from among multiple types of cores (dedicated resin / paper core, conductive paint core, metal core).

[0051] Although the required applied voltage EP differs depending on the resistance value of the winding core C, the adhesion effect of the web W to the winding core C has been confirmed for all of the metal core, conductive paint core, and dedicated resin / paper core. Therefore, it is possible to actively adopt the paper core, which is the cheapest and most widely used, as the winding core C.

[0052] According to the embodiment described above, as shown in Fig. 2, the static electricity applicator 9 is disposed at a position facing the cutter 6 with the web W sandwiched between them at the exit side of the clamping position NP. In detail, the static electricity applicator 9 is disposed at a position as close as possible to the cutter 6 without coming into contact with the cutter 6 when the cutter 6 rotates. Therefore, immediately after the web W is cut by the cutting blade 63 of the cutter 6, the web W passes between the tip of the discharge needle 9b and the outer circumferential surface of the winding core C. As a result, it is possible to attract the cut end of the web W to the winding core C more quickly than when the static electricity applicator 9 is disposed at another location.

[0053] (Modification) The web winding device according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0054] For example, in the above-described embodiment, the concept of the present invention is illustrated as being applied to a web winding device 1 shown in Figures 2, 5 to 7 of Patent Document 1, but is not limited thereto, and may also be applied to a web winding device 1' shown in Figures 8 and 9 of Patent Document 1, i.e., a web winding device 1' equipped with a turret 3 having a circular support plate 31.

[0055] In the above embodiment, the static electricity applying device 9 is disposed at the position shown in Fig. 2 so that negative ions act only on the winding core C, but the present invention is not limited to this. For example, the static electricity applying device 9 may be disposed so that negative ions act on both the web W and the winding core C.

[0056] In addition, in the above-described embodiment, an example was given in which the shortest distance DS was set to 20 mm, but this is not limited to this, and if there is room to increase the applied voltage, the shortest distance DS may be set to 20 mm or more. [Industrial Applicability]

[0057] The web winding device according to the present invention is suitable for continuously winding a web into a roll while automatically switching between tapeless winding cores. [Explanation of symbols]

[0058] 1 web winding device, 3 turret, 5 nip roller, 6 cutter, 8 near roller, 9 static electricity applying device, 9a bar body, 9b discharge needle, 9b each discharge needle, 11 dancer roller, 63 cutting blade, 64 rotating arm, 70 brush body, C winding core, DS shortest distance, EP applied voltage, NP clamping position, R various guide rollers, W web

Claims

1. A web winding device that continuously winds a web into a roll while alternately switching between winding cores, a turret having a pair of shaft support parts that individually mount the winding cores and control their rotation, and that exchanges the position of the winding cores between a winding position where the web is wound and a standby position where the winding cores are exchanged; a nip roller that, when switching, advances to the vicinity of a new core that is the core before winding and is located at the winding position, thereby nipping the web that is wound around the core that is located at the standby position and running between the new core and the nip roller; a cutter that cuts the web at a position downstream away from a clamping position where the nip roller and the new winding core clamp the web; a static electricity applying device that includes a discharge needle and applies a voltage to the discharge needle to generate static electricity in the vicinity of the new winding core, which is a grounded conductor; a grounded contact member that contacts a portion of the new winding core that is charged to the same polarity as the web, thereby charging the entire new winding core to a polarity opposite to that of the web; Equipped with the contact member is disposed on the outlet side of a position where the web contacts the new winding core, The resistance value of the new core is 10 ７ ~10 ９ and when the winding speed of the new winding core is about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance between the tip of the discharge needle and the outer circumferential surface of the new winding core is 20 mm, and the voltage applied by the static electricity applying device is set to 18 to 30 kV, When the resistance value is in the range of 10 7 to 10 9 Ω and the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 26 to 30 kV. A web winding device comprising:

2. A web winding device that continuously winds a web into a roll while alternately switching between winding cores, a turret having a pair of shaft support parts that individually mount the winding cores and control their rotation, and that exchanges the position of the winding cores between a winding position where the web is wound and a standby position where the winding cores are exchanged; a nip roller that, when switching, advances to the vicinity of a new core that is the core before winding and is located at the winding position, thereby nipping the web that is wound around the core that is located at the standby position and running between the new core and the nip roller; a cutter that cuts the web at a position downstream away from a clamping position where the nip roller and the new winding core clamp the web; a static electricity applying device that includes a discharge needle and applies a voltage to the discharge needle to generate static electricity in the vicinity of the new winding core, which is a grounded conductor; a grounded contact member that contacts a portion of the new winding core that is charged to the same polarity as the web, thereby charging the entire new winding core to a polarity opposite to that of the web; Equipped with the contact member is disposed on the outlet side of a position where the web contacts the new winding core, when the resistance value of the new winding core is in the range of 10 7 to 10 9 Ω and the winding speed of the new winding core is approximately 80 to 120 m per minute, the static electricity applying device is disposed relative to the new winding core so that the shortest distance between the tip of the discharge needle and the outer circumferential surface of the new winding core is 20 mm, and the voltage applied by the static electricity applying device is set to 18 to 30 kV; The resistance value is 10 －１ ~10 １ and when the winding speed is about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 15 to 25 kV. A web winding device comprising:

3. The resistance value is 10 －１ ~10 １ and when the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 20 to 25 kV.

3. The web winding device according to claim 2, wherein the web winding device is a winding device for winding a web.

4. A web winding device that continuously winds a web into a roll while alternately switching between winding cores, a turret having a pair of shaft support parts that individually mount the winding cores and control their rotation, and that exchanges the position of the winding cores between a winding position where the web is wound and a standby position where the winding cores are exchanged; a nip roller that, when switching, advances to the vicinity of a new core that is the core before winding and is located at the winding position, thereby nipping the web that is wound around the core that is located at the standby position and running between the new core and the nip roller; a cutter that cuts the web at a position downstream away from a clamping position where the nip roller and the new winding core clamp the web; a static electricity applying device that includes a discharge needle and applies a voltage to the discharge needle to generate static electricity in the vicinity of the new winding core, which is a grounded conductor; a grounded contact member that contacts a portion of the new winding core that is charged to the same polarity as the web, thereby charging the entire new winding core to a polarity opposite to that of the web; Equipped with the contact member is disposed on the outlet side of a position where the web contacts the new winding core, when the resistance value of the new winding core is in the range of 10 7 to 10 9 Ω and the winding speed of the new winding core is approximately 80 to 120 m per minute, the static electricity applying device is disposed relative to the new winding core so that the shortest distance between the tip of the discharge needle and the outer circumferential surface of the new winding core is 20 mm, and the voltage applied by the static electricity applying device is set to 18 to 30 kV; The resistance value is 10 －８ ~10 －７ and when the winding speed is about 80 to 120 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 10 to 20 kV. A web winding device comprising:

5. The resistance value is 10 －８ ~10 －７ and when the winding speed is about 180 to 220 m per minute, the static electricity applying device is disposed with respect to the new winding core so that the shortest distance is 20 mm or more, and the applied voltage is set to 15 to 20 kV.

5. The web winding device according to claim 4, wherein the web winding device comprises:

6. The cutter is A rotating arm having a base end portion rotatably supported; a cutting blade attached to a tip end of the rotating arm and cutting through a surface of the web as the rotating arm rotates; an elastically deformable brush body attached to the tip end of the rotating arm and contacting the end of the web cut by the cutting blade and pressing it against the new winding core; The brush body is conductive and grounded to function as the contact member. The web winding device according to any one of claims 1 to 5.

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