JP2015003816A - Web cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple web cutting device having high cutting performance at a low cost.SOLUTION: A cutting device of an embodiment is provided with: a cutting member 40 having a blade 52 for cutting a web W; a drive part for driving the cutting member 40 so that the blade 52 passes through a point most adjacent to a new core 26b in the nearly tangential direction of the new core 26b to cut the web W; and a pressing member 56 which is provided at the rear side in the cutting drive direction of the blade 52 and presses the top of the web W on the outer peripheral face of the new core 26b so as to continue to the web W cutting operation by the cutting member 40.

Description

  The present invention is applied to a winding device that automatically winds a web, and relates to a web cutting device that makes it possible to cut a web being wound on an old core and wind the web on a new core.

  As a winding device for winding a web of film, paper, foil, etc., for example, it has a pair of winding shafts, and when the core (old core) of one shaft is fully wound, the core ( A turret type winding device that automatically switches winding to a new core) is known (see Patent Document 1). When switching the winding, the attached cutting device operates. This cutting device includes a cutter for cutting the web that is stretched over the old core, and a roll for pressing the cut web against the outer peripheral surface of the new core. In the cutting step, the rotation of the take-up shaft is temporarily stopped, and the web is pressed against the new core by a roll and is crimped. Thereafter, by driving the cutter at a position away from the crimping position, the web portion stretched over the old core is cut. The old core is replaced with another new core that is not wound with a web.

  However, in such a configuration, since the distance between the crimping position of the web and the cutting position is large, the portion from the crimping position to the cutting position of the web immediately after cutting becomes an unstable free end. For this reason, there is a possibility that the leading end portion of the web after cutting sticks to the new core in an unintended manner and causes folding at the winding start portion by the new core. When such a fold occurs, a portion having a small turning radius within a predetermined range from the center of the new core is easily affected by the fold and becomes easily wrinkled, often resulting in a product loss.

  On the other hand, the structure which arrange | positions a cutter on the outer peripheral surface of a rotating drum, for example, and attaches a web presser in the rotation direction rear side is also proposed (refer patent document 2). According to such a structure, it can cut | disconnect in the vicinity, pressing a web with respect to a new core. For this reason, the free end of the web immediately after cutting is short, and the above-described folding may be suppressed.

JP-A 63-97562 JP-A-9-183093

  However, in the configuration described in Patent Document 2, since the cutter blade is integrally provided so as to protrude in the radial direction of the rotary drum, the cutter cannot be stroked in the cutting direction. For this reason, complicated control is required in which the rotary drum is provided with an air supply / discharge structure, and the web is cut by relative displacement of the web with respect to the cutter using the suction and discharge forces of the air. In addition, since the winding around the new core is started before the pressing by the web presser is started, it is necessary to accurately match the rotation speed of the new core and the rotation speed of the rotary drum, and high-precision control is required. The Since such a complicated structure and control are required, the cost increases.

  The present invention has been made in view of such problems, and an object of the present invention is to realize a web cutting device with high cutting performance easily and at low cost.

  In order to solve the above-described problems, a web cutting device according to an aspect of the present invention cuts a web spanned over an old core when switching the winding of the web from the old core to the new core, A web cutting device for attaching a tip to a new core, a positioning mechanism for bringing the web spanned over the old core close to the new core, a cutting member having a blade for cutting the web, and a cutting member The cutting part is provided on the rear side in the cutting driving direction of the blade by driving the cutting member to drive the cutting member so as to pass the closest point of contact with the new core substantially in the tangential direction of the new core. A pressing portion that presses the tip of the web against the outer peripheral surface of the new core so as to be continuous with the cutting operation of the web.

  According to this aspect, when the cutting member is driven at the time of cutting the web, the blade and the pressing portion of the cutting member continuously pass through the closest point of the new core in the substantially tangential direction of the new core. Thereby, the pressing by the pressing portion is started almost simultaneously with the cutting of the web or immediately after the cutting. In this way, by continuing the cutting and pressing of the web, it is possible to reliably prevent the folding of the leading end of the cut web. Further, since the pressing by the pressing portion is not started before the web is cut, it is not necessary to match the rotation speed of the cutting member and the rotation speed of the new core. Furthermore, since the web can be cut and spliced only by rotating the cutting member about its rotation axis, a complicated structure and control are not required, and the web can be realized simply and at low cost.

  According to the present invention, a web cutting device with high cutting performance can be realized easily and at low cost.

It is a figure which represents typically the web winding apparatus which concerns on an Example. It is a figure which represents typically the web winding apparatus which concerns on an Example. It is a figure showing the structure of the principal part periphery of a cutting device. It is a figure which shows a cutting member and its periphery structure. It is a perspective view which shows typically the cutting process in a rewinding process. It is an enlarged view which shows the locus | trajectory of the cutting member in a cutting process. It is a figure showing the detail of a cutting process. It is a figure showing the detail of a cutting process. It is a figure which shows the cutting member which concerns on a modification, and its periphery structure.

  The cutting device according to an embodiment cuts the web that is stretched over the old core when the winding of the web in the winding device is switched from the old core to the new core. Here, the “old core” means a take-up core that needs to be replaced when the web is fully wound, etc., and the “new core” means a take-up core before the web is wound. The cutting apparatus includes a guide roll that can contact and guide a web, a cutting member having a rotation shaft concentric with the guide roll, and a drive unit that drives the cutting member.

(1) Adoption of a blade extending in the tangential direction When the cutting process is started, the guide roll is disposed opposite to the new core and abuts against one side of the web. At this time, the web passes through the gap between the guide roll and the new core and is stretched over the old core, and maintains a non-contact state with respect to the new core. The guide roll rotates while guiding the web in the conveyance direction in the final winding process by the old core. The rewinding of the winding core is continuously performed in a state where the old core and the new core are rotated at a predetermined rotational speed. That is, the winding is performed so that the winding of the web is not interrupted during the rewinding. When the cutting member is driven in a state where the guide roll is in contact with the web, the blade of the cutting member passes through the gap between the guide roll and the new core in the extending direction. For this reason, the operation stroke of the blade can be made sufficiently large with respect to the thickness of the web, and the web can be easily cut in such a manner as to swing out the blade in the extending direction.

  The guide roll is rotatably supported on the rotation shaft of the cutting member. The guide roll may be attached to the rotating shaft via a bearing. In the cutting step, the moving mechanism moves the rotation shaft from the retracted position to the operating position, and brings the guide roll into contact with the web. At this time, since the cutting edge of the cutting member is kept away from the web, the surface of the web is not damaged. The drive unit rotates the cutting member in the cutting direction with the guide roll in contact with the web. As described above, when the web is cut, the guide roll is positioned in the vicinity of the cutting portion, so that stable cutting can be realized while applying an appropriate tension to the web.

  The cutting member is preferably formed in an arc shape extending along a concentric circle of the guide roll. In this way, even if the gap between the guide roll and the new core is reduced, the blade can easily pass through the gap in the extending direction by appropriately setting the concentric circle. In other words, the guide roll and the new core can be brought close to each other while sufficiently maintaining the operation stroke of the blade. As a result, the cutting position of the web and the new core can be brought close to each other, and the front end portion of the cut web can be quickly attached to the new core.

  More specifically, the point where the cutting edge of the cutting member comes into contact with the web and starts cutting may be positioned before the closest point between the guide roll and the new core in the rotational direction. Since web conveyance is continued even during the cutting process of the web, this configuration makes it possible to bring the tip of the web closer to the new core as the web cuts. By adjusting the cutting completion point so that it almost coincides with the closest point, the tip of the cut web can be pushed toward the new core in the state where it is closest to the new core. The web can be pasted.

  It is preferable that the blade of the cutting member has a shape in which an edge surface is formed toward the blade edge while the blade edge is sharp. By using such a sharp cutting edge, even if the thickness of the web is large, it can be easily cut. Then, as the cutting proceeds, the cut portion moves in the web width direction. Thereby, the effect as if the running cutter was operated in the width direction of the web can be obtained. Specifically, it is preferable that a saw blade that forms an edge surface on both sides in the blade width direction from the blade edge is continuously provided.

(2) Integration of cutting member and pressing portion In the web cutting device of this embodiment, the pressing portion is integrally provided on the rear side of the cutting member in the cutting driving direction. The pressing portion has a pressing surface that presses the tip of the web against the outer peripheral surface of the new core so as to be continuous with the cutting operation of the web by the cutting member. The pressing portion may be integrally formed with the cutting member, or may be configured separately and assembled integrally with the cutting member. In the present embodiment, the pressing by the pressing portion is started simultaneously with the completion of the cutting of the web or immediately thereafter. In this way, by continuing the cutting and pressing of the web, it is possible to reliably prevent the folding of the leading end of the cut web.

  The pressing portion is preferably made of an elastic body that is integrally fixed to the rear side in the cutting drive direction of the blade. This is because an appropriate pressure-bonding force can be applied by the elastic body, and even if there is a minute error in the positional relationship between the pressing portion and the new core, this can be absorbed. In the modification, the pressing portion may be made of the same material (for example, metal) as the blade of the cutting member, and these may be integrally formed. In this case, when the blade of the cutting member is configured in an arc shape with the rotation axis as the center, the pressing portion may be configured in an arc shape having a circumscribed circle slightly larger than the blade.

  In a modified example, the cutting member blade may be configured to be flat, and the blade tip may be directed in the tangential direction of the new core, and translational driving may be performed in the tangential direction. In this case, it is preferable that the pressing portion is flat and the distance between the pressing surface and the new core at the closest point is smaller than the distance between the blade and the new core.

  A drive part makes the moving speed of a cutting member larger than the tangential speed of the new core in a cutting process. Thereby, a press part catches up to the cutting | disconnection location of a web rapidly, and the front-end | tip part of a web can be reliably affixed on a new core. Preferably, the positional relationship between the blade and the pressing portion and the moving speed of the cutting member should be determined so that the cutting completion position of the web by the cutting member is substantially equal to the pressing start position by the pressing portion.

  The pressing part preferably has a pressing surface of a predetermined length so that the pressing position that contacts the web moves as the cutting member moves. If it does in this way, the front-end | tip part of a web can be continuously affixed on a new core over a predetermined range, and the affixing strength is also ensured. As a result, the subsequent winding to the new core can be performed more stably.

  More specifically, the cutting member and the pressing portion may have an arcuate body that is driven along a circular orbit centered on a common rotation axis. The closest point may be located on a straight line connecting the rotation axis and the rotation axis of the new core, and the pressing unit may press the web against the new core at the closest point.

[Example]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an outline of a web winding device to which the cutting device is applied will be described. 1 and 2 are diagrams schematically illustrating a web winding device according to an embodiment. FIG. 1 shows the winding process, and FIG. 2 shows the winding process (cutting process).

  As shown in FIG. 1, the winding device 10 includes a device main body 12 and a rewinding device 14. The winding device 10 is used in the final process of the film forming line, winds the web W continuously sent from the upstream process, and commercializes it as a web roll. In this embodiment, polyethylene is adopted as the material of the web W, and the film is formed so that the thickness is in the range of 100 to 300 μm. In the modification, the base sheet may be formed of other plastic film, paper, metal stay, etc., and the thickness thereof can be set as appropriate.

  The apparatus main body 12 is configured as a turret winder, and a support arm 16 and a guide arm 18 are rotatably supported by a column 20. The support arm 16 and the guide arm 18 are fixed to each other at 90 degrees to constitute a cross-shaped turret arm. The support column 20 is provided with a rotating shaft 22, and the center portion of the turret arm is fixed.

  Winding shafts 24 are respectively provided at both ends of the support arm 16. Winding cores 26 a and 26 b are detachably attached to each winding shaft 24. The support arm 16 is held horizontally during the winding control of the web W, and the web W is wound around the winding core closer to the rewinding device 14. Here, for convenience, the holding position of the winding core closer to the rewinding device 14 is also referred to as “winding position”, and the holding position of the winding core farther from the rewinding device 14 is also referred to as “standby position”. Each winding shaft 24 is provided with a motor (not shown) for rotating the winding shaft 24. These motors include a drive circuit and are driven by a control unit (not shown). In the vicinity of the winding position, a rotation sensor for detecting the number of rotations of the winding shaft 24 that rotates at the winding position is provided.

  When the winding core under winding control is fully wound, the support arm 16 is rotated 180 degrees around the rotary shaft 22 and the fully wound winding core at the winding position and the empty winding at the standby position are rotated. The take-core is switched, and the web W is rewinded. Here, for convenience, the winding core 26a is also referred to as a switching source “old core 26a” and the winding core 26b is also referred to as a switching destination “new core 26b” with reference to the state shown in the figure. The rewinding from the old core 26a to the new core 26b is performed without stopping the rotation of the old core 26a in the process. That is, while continuing the winding of the old core 26a at the final stage, the new core 26b is controlled to be continuously wound while rotating at an appropriate speed, and the winding control is not interrupted. That is, it is not necessary to stop the film forming line one by one at the time of rewinding, and the winding process can be advanced efficiently. The fully wound old core 26a moved to the standby position is replaced with another new core.

  Here, “full winding” refers to a state in which the diameter of the web W wound around the winding core becomes a preset value (product diameter). The control unit calculates the current diameter of the web W based on the preliminarily input information on the diameter of the winding core and the thickness of the web W, and the rotational speed information of the winding shaft 24 detected by the rotation sensor. When it is determined that the winding is performed, the rewinding process is executed. Note that a double-sided tape (not shown) is pasted on the outer peripheral surface of the new core 26b in advance, and can be pasted by bringing the web W into contact therewith.

  Guide rolls 28 are attached to both ends of the guide arm 18, respectively. When the turret arm is rotated at the time of rewinding, this guide roll 28 maintains the tension of the web W stretched over the old core 26a appropriately, and the extending direction of the web W for the subsequent cutting process. Hold properly.

  The rewinding device 14 is configured to support a cutting device 32, a touch roll 34, a plurality of guide rolls 36, and the like with a frame 30. The cutting device 32 is a device that cuts the web W spanned over the old core 26a when the winding core is switched. The plurality of guide rolls 36 are arranged along the film forming line of the web W, define the conveyance direction of the web W, and appropriately hold the tension. The touch roll 34 is in contact with the outer peripheral surface of the web W wound around the winding core at a constant pressure in the winding process to maintain a stable winding process, while the web W is extended in the cutting process. The direction is suitably held for cutting.

  The cutting device 32 includes a cutting member 40, a guide roll 44, and a pair of support arms 46 that support them. The pair of support arms 46 are provided apart from each other in the width direction of the frame 30 (the depth direction in the figure), and support one end side and the other end side of the rotation shaft 42 of the cutting member 40, respectively. The support arm 46 has an L-shaped main body, and a base end portion of the support arm 46 is swingably attached to the frame 30 via an attachment shaft 48. A rotation shaft 42 is rotatably supported at the distal end portion of the support arm 46. As shown in FIG. 2, each support arm 46 is driven forward and backward between a retracted position indicated by a dotted line and an operating position indicated by a solid line by a pair of air cylinders 50 supported by the frame 30. .

  That is, as shown in FIG. 2, when the old core 26a and the new core 26b are switched in the rewinding process, the process moves to the cutting process and the support arm 46 is driven to the operating position. As a result, the guide roll 44 is disposed in close proximity to the new core 26b. At this time, the guide roll 44 comes into contact with the upper surface of the web W with a predetermined tension, and rotates according to the movement of the web W by winding. However, since a sufficient gap is formed between the web W and the new core 26b in this state, the web W is not attached to the new core 26b before starting cutting. Due to the contact of the guide roll 44, the web W is stretched between the touch roll 34 and the guide roll 44. That is, the length of the cutting corresponding part can be shortened before the web W is cut, and the cutting process described later can be executed stably.

  Next, the configuration of the cutting device 32 will be described in detail. FIG. 3 is a diagram illustrating a configuration around the main part of the cutting device 32. FIG. 4 is a diagram showing the cutting member 40 and its peripheral configuration. (A) is a side view of the cutting member 40, (b) is an A direction arrow view of (a), (c) is a B direction arrow view of (a).

  As shown in FIG. 3, the cutting member 40 includes a blade 52 that has a circular arc cross section and extends in the depth direction of the drawing, and a pair of holders 54 that respectively support both ends of the blade 52. Each holder 54 is rotatably supported by a pair of support arms 46. A pressing member 56 is provided on the side surface of the blade 52 opposite to the holder 54. The pressing member 56 is made of an elastic body (for example, rubber), and is pasted over the entire length thereof except for the vicinity of the cutting edge of the blade 52. For this reason, the pressing member 56 also has a circular arc shape as shown in the drawing. A circular gear 58 whose axis is the rotation shaft 42 is fixed to the holder 54.

  As shown in FIG. 4, the blade 52 is a saw blade along the tip end edge thereof, and has a sharp shape in which the blade tip is sharp and edge surfaces 52 a are formed on both sides in the width direction toward the blade base. . In the present embodiment, the height h from the blade edge to the blade edge of the blade 52 is 15 mm. The blade 52 has a thickness of 2 mm, and the pressing member 56 has a thickness of 8 mm. The blade 52 includes a main body portion 57 sandwiched between the holder 54 and the pressing member 56 and a blade portion 59 extending in a tangential direction from the tip of the main body portion 57. The main body 57 has an arc shape along a circle (a concentric circle with the guide roll 44) centered on the rotation shaft 42. The blade portion 59 is formed in a flat shape, but is almost arcuate when the blade 52 is viewed as a whole.

  On the other hand, the guide roll 44 is rotatably supported on the rotation shaft 42 via a bearing (not shown). In other words, the guide roll 44 has a rotation shaft concentric with the cutting member 40, but is rotatable independently of the cutting member 40. The gear 58 is fixed to the rotating shaft 42 outside the holder 54.

  Returning to FIG. 3, the support arm 46 is provided with a cutting drive device 60 for driving the cutting member 40. The cutting drive device 60 includes an air cylinder 62 and a drive gear 64. The main body of the air cylinder 62 is fixed to the support arm 46, and the operating rod 66 is driven forward and backward with respect to the main body. The drive gear 64 has a fan shape and is supported so as to be rotatable about a rotation shaft 68 fixed to the support arm 46. The drive gear 64 has a central portion supported by a rotation shaft 68, and an end portion on one side (a base end portion which is a sector-shaped center) sandwiching the rotation shaft 68 rotates to a distal end portion of the operating rod 66. The other edge (the front edge, which is a fan-shaped periphery) meshes with the gear 58.

  With such a configuration, when the air cylinder 62 is operated, the drive gear 64 is moved from the standby position indicated by the broken line in the drawing to the operating position indicated by the solid line, and the gear 58 is rotated counterclockwise in the drawing. Thereby, the cutting member 40 is driven from the retracted position indicated by the broken line in the drawing to the cutting position indicated by the solid line. When the operation of the air cylinder 62 is turned off, the drive gear 64 operates in the reverse direction, whereby the cutting member 40 is returned to the retracted position.

  Next, the cutting process by the cutting device 32 will be described. FIG. 5 is a perspective view schematically showing a cutting process in the cutting step. (A) shows the state before cutting of the web W, and (b) shows the state after cutting. FIG. 6 is an enlarged view showing the trajectory of the cutting member 40 in the cutting process. 7 and 8 are diagrams showing details of the cutting process. 7A to 7D show an operation process from the start of the cutting process to the completion of cutting. FIGS. 8A to 8F show the operation process immediately before and after cutting in more detail.

  As shown in FIG. 5A, in the cutting step, first, the support arm 46 (see FIG. 2) is driven from the retracted position to the operating position, and the guide roll 44 interposes the web W between the new core 26b. Are arranged opposite to each other. At this time, the guide roll 44 abuts against one side surface (upper surface) of the web W and guides the web W in the winding direction by the old core 26a (see FIG. 2). That is, the guide roll 44 rotates according to the conveyance of the web W by winding the old core 26a. The new core 26b rotates at the same speed as the old core 26a.

  On the other hand, the cutting member 40 is held at the standby position until the rotation shaft 42 stops at a fixed position due to the movement of the support arm 46, and the blade 52 is kept away from the web W. When it stops at the fixed position, it is rotated at a predetermined timing as shown in FIG. At this time, since the rotational speed of the cutting member 40 is made larger than the rotational speed of the old core 26a and the new core 26b (that is, the conveyance speed of the web W), the blade 52 can cut into the web W and cut it. it can. In the present embodiment, each of the cutting member 40 and the new core 26b is set so that the conveyance speed of the web W is 60 to 100 m / min and the moving speed (tangential speed) of the blade 52 is two to three times the cutting speed in the cutting process. The rotation speed is set.

  As shown in FIG. 6, the cutting member 40 has a rotating shaft 42 that is concentric with the guide roll 44, and has a blade 52 that extends in a substantially tangential direction of the concentric circle. The blade 52 has an arc shape extending along the concentric circle. When the cutting member 40 is rotated in the cutting process, the blade 52 passes through the gap between the guide roll 44 and the new core 26b in the extending direction. At this time, the blade 52 passes through the closest point P with the new core 26b in a substantially tangential direction of the new core 26b. The closest point P is located on a straight line connecting the rotation shaft 42 of the cutting member 40 and the winding shaft 24 of the new core 26b (see broken line).

  The pressing member 56 is integrally provided on the rear side in the rotational direction of the blade 52, and the outer peripheral surface thereof serves as a pressing surface for pressing the web W against the new core 26b. The pressing surface has an arc shape so that the pressing position in contact with the web W moves as the cutting member 40 rotates.

  As shown in the drawing, the trajectory of the pressing surface of the pressing member 56 (see the alternate long and two short dashes line) is positioned slightly outward in the radial direction than the trajectory of the cutting edge of the blade 52 (see the alternate long and short dash line). At the closest point P, the stop position of the rotating shaft 42 is set so that the distance D between the pressing surface of the pressing member 56 and the outer peripheral surface of the new core 26b becomes a predetermined value. In the present embodiment, the distance D can be adjusted in the range of 0 to 2 mm. That is, the control unit adjusts the position of the rotation shaft 42 so that the interval D is optimal for the pasting according to the thickness of the web W. In the present embodiment, at the closest point P, the distance between the circumscribed circle of the cutting edge and the outer peripheral surface of the new core 26b is larger than the thickness of the web W, and the distance between the pressing surface of the pressing member 56 and the outer peripheral surface of the new core 26b. D is adjusted to be equal to or smaller than the thickness of the web W.

  In the cutting step, first, as shown in FIG. 7A, the cutting member 40 and the guide roll 44 are driven to predetermined positions. At this time, the guide roll 44 comes into contact with the web W while maintaining the state where the blade edge of the blade 52 is separated from the web. At this time, the cut-corresponding portion of the web W is supported between the touch roll 34 and the guide roll 44 at a short interval. In this manner, the cutting member 40 is driven in a state where the cutting corresponding portion is stably held.

  Thereby, as shown in FIG.7 (b), incision starts from the point which the blade edge | tip of the cutting member 40 contact | abutted to the web W, and as shown in FIG.7 (c) and (d), the cutting member 40 of FIG. The web W is cut back and forth in the vicinity of the blade edge. That is, the point at which the cutting edge comes into contact with the web and starts cutting is positioned before the closest point between the guide roll 44 and the new core 26b in the rotational direction, and the cutting edge is positioned at the closest point. The front and rear of the web W are separated. The angle formed between the blade 52 and the web W that abuts at the incision start point shown in FIG. 7B is approximately 90 degrees.

  Then, the leading end portion of the cut web W is pressed against the outer peripheral surface of the new core 26b by the pressing member 56 so that the cutting of the web W is continued. Thereby, the winding can be stably started without causing the web W to be folded at the winding start point of the new core 26b.

  More specifically, as shown in FIG. 8A, after the cutting edge of the blade 52 abuts against the web W, the web W is deformed slightly convex with the abutting portion at the head. As a result, the web W comes into contact with the new core 26b at a point a on the rear side of the cutting point b where the blade 52 reaches the web W. For this reason, local sticking occurs at the point a. However, since the rotational speed of the cutting member 40 is higher than the rotational speed of the new core 26b, the pressing member 56 quickly catches up with the cutting point b as shown in FIGS. 8 (b) and (c). Thereafter, since the pressing surface of the pressing member 56 continuously presses the web W, as shown in FIGS. 8D and 8E, continuous pasting with no wrinkles from the cutting point b to a is realized. can do. Then, as shown in FIG. 8F, after the cutting member 40 is completely separated from the web W, the cutting member 40 is returned to the retracted position.

  As described above, in the cutting device 32 of the present embodiment, when the cutting member 40 is driven during the cutting of the web W, the blade 52 sets the closest point of contact with the new core 26b to substantially the new core 26b. Pass tangentially. The tangential direction of the new core 26b at the closest point substantially coincides with the extending direction of the blade 52 at the closest point. For this reason, the operation stroke of the blade 52 when the web W is brought close to the new core 26b at the time of cutting can be made sufficiently large, and even the thick web W can be easily cut.

  Further, the pressing by the pressing member 56 is started almost simultaneously with the cutting of the web W or immediately after the cutting. That is, by continuously cutting and pressing the web, it is possible to reliably prevent folding at the leading end of the cut web. Further, since the pressing by the pressing portion is not started before the web is cut, it is not necessary to match the rotation speed of the cutting member and the rotation speed of the new core. Furthermore, since the web can be cut and spliced only by rotating the cutting member about its rotation axis, a complicated structure and control are not required, and the web can be realized simply and at low cost.

  In the above, this invention was demonstrated based on the Example. This embodiment is merely an example, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are within the scope of the present invention. is there.

(Modification 1)
In the said Example, although the example which comprised the blade 52 of the cutting member 40 in a saw blade shape was shown, it cannot be overemphasized that a various aspect can be employ | adopted about the shape of a blade. FIG. 9 is a diagram illustrating a cutting member and its peripheral configuration according to a modification. (A) is a side view of a cutting member, (b) is a B direction arrow directional view of (a).

  In this modification, the cutting edge shape of the blade 252 of the cutting member 240 is wider than that of the above embodiment. That is, the number of blades in the longitudinal direction of the cutting member 240 is smaller than in the above embodiment. However, it is the same in that it has a sharp shape in which the edge of the blade is sharp and the edge surfaces 252a are formed on both sides in the width direction toward the blade. Even with such a configuration, the cutting progresses in such a manner that the cutting position of the blade 252 moves in the width direction of the web W as the cutting into the web W progresses, and the cutting is as good as the above embodiment. Can be realized. In a further modification, the blade of the cutting member may be a straight blade instead of a saw blade. When the thickness of the web W is particularly small, it is considered that a straight blade is also effective.

  In this modification, the pressing portion 256 is integrally formed on the rear side of the blade 252. That is, the main body portion of the blade 252 serves as the pressing portion 256, and the pressing surface of the pressing portion 256 is continuously connected to the tapered surface 258 of the blade portion. With such a configuration, continuity between cutting and pressing (pasting) can be smoothed.

(Modification 2)
In the above-described embodiment, the guide roll 44 serving as a presser during cutting is provided concentrically with the cutting member 40. In a modified example, these may be arranged so that their axes are separated to some extent. However, in order to stabilize the cutting process, it is preferable to bring the guide rolls 44 close to each other so as not to interfere with the rotation of the cutting member 40.

(Modification 3)
In the said Example, it was set as the structure which can implement | achieve the stable cutting process by making the guide roll 44 contact | abut to the web W before starting a cutting process, and shortening a cutting corresponding | compatible location. In the modification, the guide roll 44 may be omitted. That is, a cutting-corresponding portion may be set between the touch roll 34 and the guide roll 28 shown in FIG. 2, and the cutting by the cutting member 40 may be performed at a position close to the new core 26b. In other words, the cutting performance of the web W can be maintained to some extent by adopting a configuration in which the blade is shaken out by the rotation of the cutting member without providing a separate guide roll depending on the distance of the roll that supports the cutting-corresponding portion. . In that case, the mechanism which moves the cutting member 40 for every cutting process can be abbreviate | omitted by providing the rotating shaft 42 in the position where the cutting member 40 does not interfere in a winding process.

(Modification 4)
In the said Example, the example which applies the said cutting device 32 to the winding apparatus 10 provided in the last process of the film forming line was shown. In addition, in a modification, it can also apply to the winding device of various production lines. For example, a winding device may be provided in the final process of the laminating device that bonds the base material sheet, and the winding device may be applied.

  10 winding device, 12 device main body, 14 rewinding device, 16 support arm, 18 guide arm, 24 winding shaft, 26a old core, 26b new core, 28 guide roll, 32 cutting device, 40 cutting member, 42 rotation Shaft, 44 guide roll, 46 support arm, 52 blades, 54 holder, 56 pressing member, 58 gear, 60 cutting drive device, 240 cutting member, 252 blade, W web.

Claims (6)

When switching the winding of the web from the old core to the new core, a web cutting device that cuts the web spanned over the old core and attaches the tip of the web to the new core,
A positioning mechanism for bringing the web spanned over the old core close to the new core;
A cutting member having a blade for cutting the web;
A drive unit that cuts the web by driving the cutting member so that the blade of the cutting member passes through a point closest to the new core in a substantially tangential direction;
A pressing portion that is provided on the rear side in the cutting driving direction of the blade and presses the tip of the web against the outer peripheral surface of the new core so as to be continuous with the cutting operation of the web by the cutting member;
A web cutting device comprising:   The web cutting device according to claim 1, wherein the pressing portion is formed of an elastic body integrally fixed to a rear side in the cutting driving direction of the blade.   3. The web cutting device according to claim 1, wherein the driving unit increases a moving speed of the cutting member than a tangential speed of the new core in a cutting process. 4.   The positional relationship between the blade and the pressing portion and the moving speed of the cutting member are determined so that the cutting completion position of the web by the cutting member is substantially equal to the pressing start position by the pressing portion. The web cutting device according to any one of claims 1 to 3.   The web cutting device according to any one of claims 1 to 4, wherein the pressing portion has a pressing surface having a predetermined length so that a pressing position in contact with the web moves as the cutting member moves. The cutting member and the pressing portion have an arc-shaped main body driven along a circular orbit centered on a common rotation axis,
The closest point is located on a straight line connecting the rotation axis and the rotation axis of the new core;
The web cutting device according to claim 1, wherein the pressing unit presses the web against the new core at the closest point.

Images