JP4483740B2 - Web butt joining method and apparatus - Google Patents

Description

  The present invention relates to a web butt-joining method and apparatus, and more particularly to a web butt-joint method for joining the ends of a strip-like flexible support (hereinafter referred to as “web”) such as plastic, paper, and metal foil. Relates to the device.

  As described in Patent Document 1, this type of web butt joining apparatus includes a web turret device, a web cutting and joining unit, and the like. The turret device has a turret arm, and rearranges the positions of the old roll and the new roll that are pivotally supported at both ends of the turret arm, and sequentially supplies the web to the cutting and joining unit. The cutting and joining unit has a pair of cutting drums and a joining drum, and continuously supplies the web end portion of the old roll that has been rewound and the web leading end portion of the new roll that is to be rewound. It cut | disconnects with a cutting drum, and the edge parts of the cut | disconnected web are joined with a joining tape with a joining drum. According to such a joining apparatus, the end portions can be butt-joined while continuously feeding the web of the old roll and the web of the new roll.

By the way, when the web is cut with a pair of cutting drums, the web of the old roll generates an unnecessary cutting remainder on the end side from the cutting position. This cutting remainder is adsorbed and removed by the cutting drum after the joining operation. For this reason, the cutting drum is provided with a plurality of suction ports on the downstream side of the cutting position, and the remaining cutting portion can be sucked to the cutting drum by the suction ports. Conventional suction ports are formed in a circular shape and are arranged at regular intervals in the width direction of the drum.
Japanese Patent Laid-Open No. 9-323848

  However, in the conventional apparatus, when the remaining cutting portion is sucked into the suction port, there is a problem that the remaining cutting portion causes a dent at the position of the suction port. There was a problem that caused. For this reason, when bonding tape was stuck, air entered between the bonding tape and the web of the new roll, and there was a problem that the web could not be bonded well.

  Such a problem can be solved by weakening the suction force at the suction port. However, in that case, the force for adsorbing the remaining cut portion of the web of the old roll is weakened, and there is a possibility that the remaining cut portion may be conveyed together without being peeled from the web of the new roll.

  The present invention has been made in view of the above circumstances, and can reliably adsorb the remaining cut portion of the web of the old roll and peel it from the web of the new roll, and adversely affect the joining work by the joining tape. It is an object of the present invention to provide a web butt-joining method and apparatus without fear.

In order to achieve the above object, the first aspect of the present invention provides the end of the belt-like flexible support that is rewound and conveyed from the old roll in use, and the belt-like flexibility that is rewound and conveyed from the new roll. In a butt-joining method of a web that is joined by a joining tape in a state in which the tip of the support is abutted, the tip of the belt-like flexible support of the new roll is held on one of a pair of cutting drums and joined. A preparation step of preparing a butt joint by supplying a joining tape to the drum, and after the preparation step, the pair of cutting drums and the joining drum are moved at the same speed as the conveying speed of the belt-like flexible support. The belt-like flexible support of the old roll and the belt-like flexible support of the new roll are overlapped by the pair of cutting drums, and the belt-like A cutting step of cutting obliquely with respect to the width direction of the flexible support, and a joining portion of the end portions of the two strip-shaped flexible supports cut in the cutting step with one of the pair of cutting drums A feeding step of feeding the abutting portion to the joining position while cooperating with the drum, a joining step of attaching the joining tape to the abutting portion fed to the joining position by the joining drum, and the cutting A separation step of separating the remaining portion of the strip-shaped flexible support body of the old roll, which is cut obliquely in the step, from the strip-shaped flexible support body of the new roll by adsorbing to the one of the pair of cutting drums; And a peeling step of sucking an acute angle portion on the distal end side in the running direction of the remaining cutting portion with a suction force larger than that of the other portions.

According to the first aspect of the present invention, since the acute angle portion on the distal end side in the running direction of the cutting remaining portion is sucked with a suction force larger than that of the other portions, the cutting remaining portion can be efficiently peeled off. Therefore, since the efficiency of peeling off the remaining cutting portion can be improved without increasing the overall suction force, the remaining cutting portion can be reliably peeled off without adversely affecting the joining work by the joining tape.

In order to achieve the above-mentioned object, the invention according to claim 2 is configured such that the end of the belt-like flexible support that is rewound and conveyed from the old roll in use and the belt-like flexibility that is rewound and conveyed from the new roll. In a butt-joining apparatus for a web that is joined by a joining tape in a state in which the front end portion of the support is abutted, a turret means that supports the old roll and the new roll so that they can be rewound and can rotate at predetermined angles. The belt-like flexible support of the old roll and the belt-like flexible support of the new roll are overlapped by rotating at the same speed as the conveyance speed of the belt-like flexible support during the joining operation. A pair of cutting drums for cutting and a tape holding part for holding the bonding tape are provided, and the two belt-shaped possible members are rotated by being driven at the same speed as the conveying speed of the band-shaped flexible support during the bonding operation. A bonding drum for adhering the bonding tape to the abutting portion of the end of the conductive support, and one of the pair of cutting drums, arranged along a cutting line by the pair of cutting drums, and the cutting short in the direction of the line, e Bei a suction mechanism, a adsorbing cut remainder of the band-shaped flexible support of said old roll by a plurality of suction ports formed in a long shape in a direction perpendicular to the cutting line, the The pair of cutting drums are configured to be cut obliquely with respect to the width direction of the belt-like flexible support, and the suction mechanism is the remaining cutting portion of the belt-like flexible support of the old roll cut obliquely The pitch of the suction port that sucks the acute angle portion on the tip side is configured to be narrower than the pitch of the suction port that sucks other portions .

In the invention of claim 2 , since the suction port of the cutting drum is formed in a shape that is short in the direction of the cutting line and long in the direction perpendicular to the cutting line, the belt-like flexible support body falls into the suction port and is recessed. And the strong adsorbing force of the belt-like flexible support by the adsorbing port can be maintained. Therefore, the strip-shaped flexible support of the new roll is reliably adsorbed by cutting the remaining portion of the strip-shaped flexible support of the old roll while preventing the belt-like flexible support of the new roll from being dented and causing poor bonding. It can peel from a support body. In addition, since the pitch of the suction port that sucks the acute angle portion on the tip side of the remaining cutting portion is narrower than the pitch of the other portion, the suction force that sucks the acute angle portion on the tip side of the remaining cutting portion becomes larger than the other portion. Therefore, the remaining cutting portion can be efficiently peeled from the belt-like flexible support of the new roll.

According to a third aspect of the present invention, in the second aspect of the present invention, the suction port is connected to a suction device via a tank, and a valve is disposed between the tank and the suction port. And Therefore, according to the invention of claim 3, a large suction force can be rapidly applied to the suction port by opening and closing the valve in a state where the inside of the tank is set to a negative pressure by the suction device.

In order to achieve the above-mentioned object, the invention according to claim 4 has the end portion of the belt-like flexible support that is rewound and conveyed from the old roll in use, and the belt-like flexibility that is rewound and conveyed from the new roll. In a butt-joining apparatus for a web that is joined by a joining tape in a state in which the front end portion of the support is abutted, a turret means that supports the old roll and the new roll so that they can be rewound and can rotate at predetermined angles The belt-like flexible support of the old roll and the belt-like flexible support of the new roll are overlapped by rotating at the same speed as the conveyance speed of the belt-like flexible support during the joining operation. And a pair of cutting drums that are cut obliquely with respect to the transport direction of the belt-like flexible support, and a tape holding portion that holds the joining tape, and transporting the belt-like flexible support during the joining operation. speed By rotating and driving at the same speed, a joining drum for attaching the joining tape to the abutting portion of the end portions of the two belt-like flexible supports, and one of the pair of cutting drums are provided. A plurality of suction ports arranged along the cutting line by the cutting drum absorb the cutting remainder of the strip-like flexible support of the old roll, and other suction force absorbs the acute angle portion on the tip side of the cutting residual. And an adsorption mechanism configured to be larger than an adsorption force for adsorbing the portion.

According to the fourth aspect of the present invention , since the acute angle portion on the distal end side in the running direction of the remaining cutting portion is sucked with a suction force larger than that of the other portions, the remaining cutting portion can be efficiently peeled off. Therefore, since the efficiency of peeling off the remaining cutting portion can be improved without increasing the overall suction force, the remaining cutting portion can be reliably peeled off without adversely affecting the joining work by the joining tape.

  According to the present invention, the suction port of the cutting drum is formed in a shape that is short in the direction of the cutting line and long in the direction perpendicular to the cutting line, so that the belt-like flexible support body falls into the suction port and is recessed. In addition, it is possible to ensure a strong adsorption force by securing the adsorption area. Therefore, the strip-shaped flexible support of the new roll is reliably adsorbed by cutting the remaining portion of the strip-shaped flexible support of the old roll while preventing the belt-like flexible support of the new roll from being dented and causing poor bonding. It can peel from a support body.

  Preferred embodiments of a web butt-joining method and apparatus according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an overall configuration diagram of a web butt joining apparatus according to an embodiment of the present invention. As shown in the figure, the joining device 10 is mainly composed of a turret device 12 and a cutting and joining unit 14.

  The turret device 12 has a turret arm 18, and this turret arm 18 is rotatably provided on a support 20 with a shaft 22 as a fulcrum. At one end of the turret arm 18, an old roll 24, which has finished rewinding the web, is rotatably supported via a shaft 26, and at the other end, a new roll 28, which starts rewinding the web, has a shaft 30. It is supported so that it can rotate through. The web 32 wound around the old roll 24 is unwound from the old roll 24, and then rolled onto the guide rollers 34 and 36 and guided to the cutting and joining unit 14.

  As shown in FIG. 2, the cutting and joining unit 14 includes a cutting drum 38, a cutting and joining drum (corresponding to a cutting drum) 40, and a joining drum 42, and each drum 38, 40, 42 is installed in the machine frame 41. ing. Further, each of the drums 38, 40, and 42 is rotated in synchronization by power from a drive motor (not shown).

  The web 32 from the old roll 24 described above is inserted between the cutting drum 38 and the cutting and joining drum 40 and between the cutting and joining drum 40 and the joining drum 42, and then the tension and speed of the web 32 are changed. Is sent to a buffering device (not shown) for buffering. On the other hand, the front end of the web 44 from the new roll 28 is attracted to the cutting drum 38 and waits in a state where the preparation for joining is completed.

  A cutter 46 is provided on the outer periphery of the cutting drum 38. The cutter 46 is attached so as to protrude from the outer peripheral surface of the cutting drum 38 by a predetermined amount. Further, the cutter 46 is attached at a predetermined inclination angle θ ° with respect to the width direction of the cutting drum 38 (that is, the width direction of the webs 32 and 44) for improving the sharpness. The cutting / joining drum 40 is provided with a cutting portion 48 at a position where the cutter 46 abuts. The web 32 and the web 44 are sandwiched between the cutting portion 48 and the cutter 46 so that the web 32 and the web 44 are sandwiched. Disconnected.

  A flat portion is provided on the surface of the cutting drum 38, and air holes 50 are formed in the flat portion. These vent holes 50 are communicated with the internal space 52 </ b> A of the rotary hollow shaft 52 through the vent holes 54 formed in the rotary hollow shaft 52. A suction device (not shown) communicates with the internal space 52A of the rotary hollow shaft 52. By driving this suction device, a suction force acts on the vent holes 50 and 50, and the vicinity of the tip of the web 44 is near the vent hole 50. , 50. Further, a jet outlet 61 is formed on the surface of the cutting drum 38 at a position downstream of the cutter 46 in the rotational direction. The jet port 61 communicates with the internal space 52 </ b> B of the rotary hollow shaft 52 via a vent hole 63 formed in the rotary hollow shaft 52. The internal space 52B is communicated with an air supply device (not shown), and air is ejected from the ejection port 61 by driving the air supply device. Accordingly, the remaining cutting portion (see FIG. 5) 44 </ b> B after cutting the web 44 can be detached from the cutting drum 38. In addition, it is preferable to provide a baffle plate (not shown) so that the air injected from the injection port 61 does not directly hit the joining drum 42.

  In the joining drum 42, intake holes 56, 56 are formed. The intake hole 56 communicates with a vent hole 60 formed in the rotary hollow shaft 58, and the rotary hollow shaft 58 is connected to a suction device (not shown). Therefore, by driving the suction device, the bonding tape 62 is attracted and held in the intake hole 56. The joining tape 62 is automatically supplied by a tape supply device (not shown).

  As shown in FIG. 2, the cutting and joining drum 40 has a substantially D-shaped cross section, and the above-described cutting portion 48 is attached to an arc-shaped outer peripheral portion. In addition, guide rollers 43 and 43 are rotatably attached to both end positions of the arc-shaped outer peripheral portion so that the web 32 is not caught at both end positions of the arc-shaped outer peripheral portion.

  Further, a plurality of suction ports 45, 45... (Only one is shown in FIG. 2) are formed in the arc-shaped outer peripheral portion at a position downstream of the cutting portion 48 in the rotation direction. The suction port 45 is communicated with a vent hole 49 formed in the rotary hollow shaft 47, and the rotary hollow shaft 47 is connected to the intake device 53 via the tank 51. A valve 55 is provided in a pipe that connects the tank 51 and the rotary hollow shaft 47. By opening and closing the valve 55, communication between the rotary hollow shaft 47 and the tank 51 is controlled. The tank 51 has a sufficiently larger internal capacity than the rotary hollow shaft 47, and by making the tank 51 and the rotary hollow shaft 47 communicate with each other, an adsorption force can be rapidly applied to the adsorption port 45. .

  FIG. 7 is a front view of the cutting and joining drum 40, and shows the arrangement of the suction ports 45. In the drawing, a two-dot chain line indicates a position where the cutter 46 of the cutting drum 38 contacts, that is, a cutting line.

  As shown in the figure, the plurality of suction ports 45, 45... Are arranged close to the cutting line and parallel to the cutting line. The distance between each suction port 45 and the cutting line is preferably as close as possible, but if it is too close, it adversely affects cutting, so about 3 to 5 mm is preferable. By narrowing the gap between the suction port 45 and the cutting line in this way, the tip of the remaining cutting portion 32B of the web 32 (that is, the distal end portion of the web 32 after cutting: see FIG. 6) can be sucked. The cutting remainder 32B can be efficiently peeled from the web 44.

  Each suction port 45 is formed in a rectangular shape that is narrow in the direction of the cutting line and long in the direction perpendicular to the cutting line. By forming each suction port 45 in such a long and narrow rectangular shape, it is possible to prevent the cutting remaining portion 32B of the web 32 sucked by the suction port 45 from being recessed, and to secure a sufficient suction area for cutting. The remaining portion 32B can be reliably adsorbed.

  Further, the suction ports 45 are formed close to each other by three. The suction port group composed of the three suction ports 45 communicates with one round vent hole 57 and communicates with the rotating hollow shaft 47 through the vent hole 57.

  The pitch between the suction port groups is formed such that the pitch L1 of the portion on the upstream side in the rotation direction (that is, the portion that sucks the acute angle portion on the tip side of the remaining cutting portion 32B) is smaller than the pitch L2 of the other portions. Has been. Therefore, the suction force that sucks the acute angle portion on the tip side of the remaining cutting portion 32B is larger than the suction force that sucks other portions of the remaining cutting portion 32B. Thus, the cutting remaining portion 32B can be efficiently peeled from the web 44 of the new roll 28 by adsorbing the acute angle portion on the tip side of the cutting remaining portion 32B with a large adsorbing force. The pitches L1 and L2 are preferably set in the range of 10 to 20 mm when the side L0 of the suction port group is 8 to 15 mm.

  As shown in FIG. 2, a guide member 72 is provided at an intermediate position between the cutting drum 38, the cutting / joining drum 40, and the joining drum 42. The surface of the guide member 72 is coated with a fluorine resin or the like so that the webs 32 and 44 slide smoothly. The guide member 72 has an upper surface formed in an arc shape. When the cutting / joining drum 40 rotates and the arc-shaped outer peripheral surface faces the guide member 72, the guide member 72 is connected to the cutting / joining drum 40. It forms so that it may become a fixed space | interval with respect to a circular arc-shaped outer peripheral surface. By guiding with the guide member 72, the end portions of the webs 32 and 44 can be fed into the joining position with the end portions being in contact with each other.

  Next, the operation of the web butt joining apparatus constructed as described above will be described with reference to FIGS.

  First, as a preparation step, as shown in FIG. 2, the cutting drum 38 holds the tip of the web 44 of the new roll 28. Further, the joining tape 62 is held on the joining drum 42. In this state, the feeding of the web 32 from the old roll 24 is continued. When the end portion of the web 32 appears, the end portion is detected by a sensor, and rotation driving of the cutting drum 38, the cutting joining drum 40, and the joining drum 42 is started based on the detection signal of the sensor.

  By rotating the cutting drum 38 and the cutting and joining drum 40, the webs 32 and 44 are fed between the cutting drum 38 and the cutting and joining drum 40 in a superposed state as shown in FIG. 3. As shown in FIG. 4, the webs 32 and 44 are sandwiched and cut between the cutter 46 of the cutting drum 38 and the cutting portion 48 of the cutting and joining drum 40 (cutting step).

  The cut webs 32 and 44 are sent out from the cutting drum 38 and the cutting joining drum 40 in a state in which the end of the web 32 and the tip of the web 44 are in contact with each other. At that time, the abutting portion can be reliably fed into the gap between the guide member 72 and the cutting / joining drum 40 by injecting air from the outlet 61 of the cutting drum 38. The fed webs 32 and 44 are guided by the guide member 72 to move the gap between the guide member 72 and the cutting and joining drum 40 while maintaining the abutted state, and are moved to the joining position as shown in FIG. It is sent (feeding step). When the webs 32 and 44 are fed, the remaining cutting portion 44B of the web 44 of the new roll 28 (that is, the portion on the tip side with respect to the cutting position) 44B is attracted to the cutting drum 38 and peeled off from the web 32 and removed. Further, the remaining cutting portion 32 </ b> B of the web 32 of the old roll 24 is attracted to the suction port 45 of the cutting and joining drum 40 and is sent to the joining position while being overlapped with the web 44.

  The webs 32 and 44 fed to the joining position are bonded with the joining tape 62 at the abutting portions. As a result, the butted portions of the webs 32 and 44 are joined (joining step).

  The joined webs 32 and 44 are sent to a subsequent buffer device (not shown) to buffer tension fluctuations and speed fluctuations. When the joined webs 32 and 44 are sent out to the shock absorber, the cutting and joining drum 40 rotates as shown in FIG. 6, so that the uncut portion 32 </ b> B of the web 32 adsorbed to the cutting and joining drum 40 is peeled off from the web 44. (Peeling step). The remaining cutting portion 32B after peeling is removed by a terminal treatment device (not shown). Instead of removing the remaining cutting portion 32B with the end treatment device, the old roll 24 may be wound around the old roll 24 by rotating it backward.

  As described above, according to the present embodiment, the suction port 45 of the cutting and joining drum 40 is formed in a rectangular shape that is short in the direction of the cutting line and long in the direction perpendicular to the cutting line. The cut remaining portion can be prevented from being recessed at the position of the suction port 45, and the opening area of the suction port 45 can be sufficiently secured to securely suck the remaining cut portion 32B. Therefore, since the web 44 does not dent at the position of the suction port 45, air can be prevented from entering between the web 44 and the joining tape 62, and poor joining of the joining tape 62 can be prevented.

  Further, according to the present embodiment, since the suction port 45 is formed in a rectangular shape and arranged in parallel with the cutting line, the interval between the suction port 45 and the cutting line can be reduced, and the tip of the remaining cutting portion 32B. The vicinity can be adsorbed. Thereby, the cutting remainder part 32B can be efficiently peeled from the web 44 with a small adsorption force.

  Further, according to the present embodiment, the plurality of suction ports 45, 45... Are arranged along the cutting line, and the suction ports 45, 45 are provided at the acute angle portion on the distal end side of the remaining cutting portion 32B that becomes the action point at the time of peeling. Since the suction force is increased by making the pitch of... Narrower than the pitch of other portions, the remaining cutting portion 32B can be efficiently peeled off. Therefore, the remaining tip can be adsorbed and peeled reliably without increasing the adsorbing force of the entire adsorbing port 45.

  Further, according to the present embodiment, the tank 51 is provided between the suction port 45 and the suction device 53 to make the inside of the tank 51 have a negative pressure, and the valve 55 is provided between the tank 51 and the suction port 45. Since it is provided and opened and closed, a large suction force can be rapidly applied to the suction port 51.

  In the above-described embodiment, the suction port group is formed by arranging three suction ports 45 close to each other, and this suction port group is disposed at a predetermined pitch L1, L2. 45 may be arranged at a predetermined pitch.

  In the above-described embodiment, the suction force is increased by narrowing the pitch L1 of the suction port group at the acute angle portion on the tip side of the remaining cutting portion 32B to be smaller than the pitch L2 of the other portions. The suction force may be changed by connecting the suction port 45 and the other suction port 45 to different suction devices.

Overall configuration diagram of a web butt joining apparatus according to an embodiment of the present invention Configuration diagram showing the cutting and joining unit before cutting and joining work Configuration diagram of the cutting and joining unit for explaining the cutting and joining work Configuration diagram of the cutting and joining unit for explaining the cutting and joining work Configuration diagram of the cutting and joining unit for explaining the cutting and joining work Configuration diagram of the cutting and joining unit for explaining the cutting and joining work Front view of cutting and joining drum showing the arrangement of suction ports

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Web butt joining apparatus, 12 ... Turret apparatus, 14 ... Web cutting | disconnection joining unit, 32 ... Web, 32B ... Cutting remainder, 38 ... Cutting drum, 40 ... Cutting joining drum, 42 ... Joining drum, 44 ... Web, 45 ... Suction port, 72 ... Guide member

Claims (4)

Joined with a joining tape in a state where the end of the belt-like flexible support that is rewound and transported from the old roll in use is in contact with the tip of the belt-like flexible support that is rewound and transported from the new roll In the web butt-joining method,
A preparatory step for preparing a butt joint by holding one end of the belt-like flexible support of the new roll on one of a pair of cutting drums and supplying a joining tape to the joining drum;
After the preparation step, the pair of cutting drums and the joining drum are rotationally driven at the same speed as the conveying speed of the band-shaped flexible support, and the pair of cutting drums support the band-shaped flexible support of the old roll. A cutting step in which the body and the belt-like flexible support of the new roll are overlapped and cut obliquely with respect to the width direction of the belt-like flexible support;
While the abutting portions of the ends of the two strip-shaped flexible supports cut in the cutting step are held in cooperation by one of the pair of cutting drums and the joining drum, the abutting portions are sent to the joining position. Included steps,
A joining step of adhering the joining tape with the joining drum to the butting portion fed to the joining position;
In the peeling step of peeling off the cutting residual portion of the strip-shaped flexible support body of the old roll diagonally cut in the cutting step from the strip-shaped flexible support body of the new roll by adsorbing it to one of the pair of cutting drums. A web butt-joining method, comprising: a peeling step of sucking an acute angle portion on a distal end side in the running direction of the remaining cutting portion with a larger suction force than other portions. Joined with a joining tape in a state where the end of the belt-like flexible support that is rewound and transported from the old roll in use is in contact with the tip of the belt-like flexible support that is rewound and transported from the new roll In a web butt joining device,
A turret means that supports the old roll and the new roll so that they can be rewound, and is rotatable at a predetermined angle;
The belt-like flexible support of the old roll and the belt-like flexible support of the new roll are overlapped by rotating at the same speed as the transport speed of the belt-like flexible support during the joining operation. A pair of cutting drums,
A tape holding section for holding the bonding tape, and a butt portion of the ends of the two band-shaped flexible supports by being driven to rotate at the same speed as the conveyance speed of the band-shaped flexible support during the bonding operation A bonding drum for attaching the bonding tape to
A plurality of ones provided on one of the pair of cutting drums, arranged along a cutting line by the pair of cutting drums, and formed in a shape that is short in the direction of the cutting line and long in a direction perpendicular to the cutting line. Bei example and a suction mechanism for sucking the cut remainder of the band-shaped flexible support of said old roll by adsorption port,
The pair of cutting drums are configured to cut obliquely with respect to the width direction of the belt-like flexible support,
In the suction mechanism, the pitch of the suction port that sucks the acute angle portion on the front end side becomes narrower than the pitch of the suction port that sucks the other portion in the remaining cut portion of the strip-like flexible support of the old roll cut obliquely. A web butt-joining apparatus characterized by being configured as described above . 3. The web butt-joining apparatus according to claim 2, wherein the suction port is connected to a suction device via a tank, and a valve is disposed between the tank and the suction port. Joined with a joining tape in a state where the end of the belt-like flexible support that is rewound and transported from the old roll in use is in contact with the tip of the belt-like flexible support that is rewound and transported from the new roll In a web butt joining device,
A turret means that supports the old roll and the new roll so that they can be rewound, and is rotatable at a predetermined angle;
In a state where the belt-like flexible support of the old roll and the belt-like flexible support of the new roll are superposed by rotating at the same speed as the conveyance speed of the belt-like flexible support during the bonding operation, And a pair of cutting drums that cut obliquely with respect to the transport direction of the belt-like flexible support;
A tape holding section for holding the bonding tape, and a butt portion of the ends of the two band-shaped flexible supports by being driven to rotate at the same speed as the conveyance speed of the band-shaped flexible support during the bonding operation A bonding drum for attaching the bonding tape to
The cutting residual portion of the strip-shaped flexible support of the old roll is adsorbed by a plurality of suction ports provided on one of the pair of cutting drums and arranged along a cutting line by the pair of cutting drums, and the cutting A web butt-joining apparatus, comprising: a suction mechanism configured to have a suction force that sucks an acute angle portion on the distal end side of the remaining portion larger than a suction force that sucks another portion.

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