Web dancer device and unwinding device using same

Abstract

To provide a dancer device which can be achieved without providing a guide roll outside, and to provide an unwinding device using the same.SOLUTION: A dancer device 10 of a web W travelling in the frontward / backward direction includes: a frame 12 of a dancer device 10; a center shaft 26 supported at the frame 12 in a rotatable manner, and horizontally in the left-to-right direction; a center roll 30 provided on the outer periphery of the center shaft 26 coaxially and rotatably; a pair of left and right roll arm parts 32, 34 protruding forward from the center shaft 26 on both left and right sides of the center roll 30; a dancer roll 40 supported at tips of the roll arm parts 32, 34 in a rotatable manner, and in parallel with the center roll 30; a weight arm part 48 protruding backward from the center shaft 26; a weight 50 provided at a tip of the weight arm part 48; a crank part 52 protruding radially outward from the center shaft 26; and an air cylinder 54 provided at the frame 12 for pressing a tip of the crank part 52 to rotate the center shaft 26.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a web dancer device and a web unwinding device. [Background technology]

[0002] The role of the dancer device is to absorb the slack or tension and maintain the normal running state of the web when the running of the web W is disrupted by an external disturbance in an unwinder or press device located before or after the pass line of the dancer device, causing the web to become slack or tense. For example, if the running web becomes slack, the dancer roll lowers to absorb the slack, and conversely, if the web becomes tense, the dancer roll rises to absorb the tension and maintain the running state of the web. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-48388 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-105450 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-61361 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the dancer device described above, it is necessary to provide a guide roll outside the dancer device to guide the web from another device to the dancer roll, which poses a problem of increasing the size of the dancer device.

[0005] SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a web dancer device which can be realized without providing an external guide roll, and an unwinding device using the same. [Means for solving the problem]

[0006] a center roll mounted coaxially and rotatably on the outer periphery of the center shaft; a pair of roll arms projecting forward from the center shaft on both the left and right sides of the center roll; a dancer roll rotatably supported at the ends of the roll arms and parallel to the center roll; a weight arm projecting rearward from the center shaft; a weight attached to the end of the weight arm; a crank projecting radially outward from the center shaft; and a cylinder attached to the frame for pressing against the end of the crank to rotate the center shaft, wherein the running web is stretched across the center roll and the dancer roll, and the pair of roll arms are maintained horizontal by the weight of the weight and the pressing force of the cylinder.

[0007] The present invention also provides a web unwinding device comprising: a winding core around which a web is wound; a first dancer device according to the above invention provided in front of the winding core; and a second dancer device according to the above invention provided behind the winding core. [Effects of the Invention]

[0008] According to the present invention, the center roll serves as a guide roll for the dancer roll, so that no external guide roll is required. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a dancer device according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a left side view of the dancer device. [Figure 3] FIG. 2 is a horizontal-longitudinal cross-sectional view of the dancer device as seen from above. [Figure 4] 10A and 10B are diagrams illustrating the operation state of the dancer device. [Figure 5] FIG. 10 is a left side view of the unwinding device of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] In the embodiment of the present invention, a dancer device for the web W and an unwinding device for the web W will be described.

[0011] A dancer device 10 according to a first embodiment of the present invention will be described with reference to FIGS.

[0012] (1) Structure of the dancer device 10 The overall structure of the dancer device 10 will be described with reference to Figures 1 to 3. The dancer device 10 adjusts the slack and tension of the web W running in the front-to-rear direction. The long web W may be film, paper, fabric, or the like. In this specification, the left and right directions are determined when viewed from the back to the front.

[0013] The frame 12 of the dancer device 10 has a base 14 placed on a horizontal floor and a wall 16 erected from the base 14 along the front-rear direction.

[0014] A circular mounting hole 18 is opened in the wall 16, and a cylindrical mounting member 20 is attached to this mounting hole 18. A flange portion 22 protrudes from the outer periphery of the cylindrical mounting member 20, and this flange portion 22 and the wall 16 at the edge of the mounting hole 18 are fixed with bolts (not shown). In this way, the cylindrical mounting member 20 is fixed to the wall 16 horizontally and in the left-right direction.

[0015] A center shaft 26 is attached to the inner periphery of the cylindrical attachment member 20 via bearings 24, 24 so as to be horizontal and rotatable in the left and right directions.

[0016] A center roll 30 is attached via bearings 28, 28 to the outer periphery of the center shaft 26 on the left side of the wall 16 so as to be coaxial with and rotatable about the center shaft 26. In other words, the center shaft 26 passes through the center roll 30 coaxially.

[0017] To the left of the wall 16, a pair of left and right roll arms 32 and 34 protrude forward from center shafts 26 located on both the left and right sides of the center roll 30. A dancer shaft 36 is fixed horizontally in the left-right direction between the front ends of the left roll arm 32 and the right roll arm 34. A dancer roll 40 is rotatably attached to the outer periphery of the dancer shaft 36 via bearings 38, 38. In other words, the dancer shaft 36 passes through the interior of the dancer roll 40. When the center shaft 26 rotates, the pair of left and right roll arms 32 and 34 rotate in the same manner.

[0018] A ring-shaped ring member 46 is fixed to the center shaft 26 to the right of the wall 16, and a rod-shaped weight arm 48 protrudes rearward from this ring member 46. A cylindrical weight 50 is attached to the rear end of this weight arm 48. The pair of left and right roll arms 32 and 34 and weight arm 48 are approximately horizontal when viewed from the left side and are aligned in a straight line with the center shaft 26 as the center. Note that the ring member 46 is fixed to the center shaft 26, and when the center shaft 26 rotates, the weight 50 also rotates.

[0019] A plate-shaped crank portion 52 protrudes forward between the wall 16 and the ring member 46. This crank portion 52 is also fixed to the center shaft 26, and when the crank portion 52 rotates, the center shaft 26 also rotates.

[0020] A cylinder support part 56 is provided on the right surface of the wall 16 located in front of the center shaft 26, and an air cylinder 54 is attached to this cylinder support part 56 in a vertical direction. More specifically, the upper end of a cylindrical cylinder body 58 of the air cylinder 54 is rotatably fixed to the cylinder support part 56 via a cylinder shaft part 60. A piston rod 62 protrudes telescopically from the lower end of the cylinder body 58, and a rectangular parallelepiped connecting member 64 is attached to the lower end of the piston rod 62. A groove 66 is provided at the lower end of this rectangular parallelepiped connecting member 64, and the plate-shaped crank part 52 fits inside this groove 66 and is rotatably connected to the connecting shaft 68.

[0021] When the weight arm 48 swings up and down around the center shaft 26, a rod-shaped upper blocking portion 70 that blocks upward rotation and a rod-shaped lower blocking portion 72 that blocks downward rotation protrude from the right surface of the wall 16. This allows the weight 50 to rotate upward by 25° from the horizontal position to the upper blocking portion 70, and downward by 25° from the horizontal position to the lower blocking portion 72, and the pair of left and right roll arms 32 and 34 also rotate by this angle.

[0022] (2) Operational state of the dancer device 10 Next, the operating state of the dancer device 10 will be described.

[0023] First, with the air cylinder 54 not pressing the crank portion 52 at all and with the web W not being wound around the center roll 30 and the dancer roll 40, the weight of the weight 50 and the length of the weight arm 48 are adjusted so that the pair of left and right roll arms 32, 34 are in a reference position (for example, horizontal). Explaining this in terms of the "principle of leverage," the center shaft 26 is the fulcrum, the rear end of the weight arm 48 is the force point, and the front end of the pair of left and right roll arms 32, 34 are the points of application. Therefore, the weight of the weight 50 and the length of the weight arm 48 are determined so that the weight at the force point (weight of the dancer roll 40), the distance from the fulcrum to the force point (length of the left roll arm 32 or right roll arm 34), the weight at the force point (weight of the weight 50), and the distance from the fulcrum to the force point (length of the weight arm 48) are balanced.

[0024] Next, the web W is wound around the upper peripheral surface of the center roll 30 and then wound around the lower peripheral surfaces of the dancer rolls 40 in order.

[0025] Next, with the web W stretched across, the air cylinder 54 presses the crank portion 52 downward so that the pair of left and right roll arms 32, 34 are at their reference positions. The pressure of the air cylinder 54 is always constant while the dancer device 10 is in operation.

[0026] Next, when the web W is run in the front-to-rear direction and the web W becomes slack due to disturbances from a winding device located in front of the dancer device 10 or a press roll device located behind the dancer device 10, the dancer roll 40 rotates downward about the center shaft 26 in response to the slack, thereby absorbing the excess web W. Furthermore, when the web W becomes taut, the dancer roll 40 rotates upward about the center shaft 26 in response to the slack, thereby slackening the taut web W.

[0027] (3) Effects As described above, in the dancer device 10 of this embodiment, the guide rolls that were previously provided separately are provided integrally on the center shaft 26 as the center roll 30, eliminating the need for separate guide rolls and allowing the overall size of the dancer device 10 to be reduced.

[0028] Furthermore, the dancer rolls 40 can be provided in front of the center roll 30, the weights 50 can be provided behind it, and the air cylinders 54 can be provided alongside the dancer rolls 40, thereby reducing the overall size of the dancer device 10. The dancer roll 40 moves up and down in accordance with the tension of the web W, thereby adjusting the tension.

[0029] Furthermore, when the web W is running with a constant tension and without slack or tension, the dancer roll 40 is also in a horizontal reference position relative to the center roll 30, and when the web W slackens, the dancer roll 40 rotates below the center roll 30 to absorb the slack, and when the web W is taut, the dancer roll 40 rotates above the center roll 30 to absorb the tension.

[0030] Next, a web W unwinding device 100 using two dancer devices 10 described in the first embodiment will be described with reference to FIG.

[0031] The frame 102 of the unwinding device 100 has a base 104 placed on a horizontal floor and a wall 106 protruding in the front-to-rear direction from the base 104. A winding core 108 around which the web W is fully wound is attached to the wall 106 in the center in the front-to-rear direction so as to be horizontal and rotatable in the left-to-right direction.

[0032] In front of the winding core 108, the first dancer device 10 described in the first embodiment is mounted on the wall 106. Behind the winding core 108, a second dancer device 110, which is the dancer device 10 described in the first embodiment but with its position reversed in the front-to-rear direction, is mounted on the wall 106. That is, the second dancer device 110 has the center roll 30 in front and the dancer roll 40 in the rear.

[0033] The unwinding device 100 is a device capable of unwinding the web W from either the front or rear of the winding core 108, and when unwinding the web W from the front, the first dancer device 10 is used, and when unwinding from the rear, the second dancer device 110 is used.

[0034] Furthermore, when the web W is wound around the winding core 108 in an upper winding, the web W is laid over the upper peripheral surface of the center roll 30 from above, and when the web W is wound around the winding core 108 in a lower winding, the web W is laid over the upper peripheral surface of the center roll 30 from below.

[0035] With the unwinding device of this embodiment, the web W can be unwound from the winding core 108 either forward or backward.

[0036] Furthermore, the first dancer device 10 and the second dancer device 110 are provided in front of and behind the winding core 108, but there is no need to provide a guide roll between them and the winding core 108 as in the past, which allows for a smaller space to be used.

[0037] In the above-described first embodiment, the air cylinder 54 is disposed above the dancer rolls 40, and the web W is stretched over the lower peripheral surfaces of the dancer rolls 40. Alternatively, the air cylinder 54 may be disposed below the dancer rolls 40, and the web W may be stretched over the upper peripheral surfaces of the dancer rolls 40, and the web W may be stretched over the lower peripheral surface of the center roll 30.

[0038] Furthermore, in the first embodiment, the air cylinder 54 is used, but a hydraulic cylinder may also be used.

[0039] Furthermore, in the first embodiment, the crank portion 52 is disposed in the front-rear direction, but instead, it may be disposed in the vertical direction from the center shaft 26, and the air cylinder 54 may be disposed in the front-rear direction and horizontally.

[0040] Although one embodiment of the present invention has been described above, this embodiment is presented by way of example and is not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0041] 10 dancer device, 12 frame, 16 wall, 26 center shaft, 30 center roll, 32 roll arm, 34 roll arm, 40 dancer roll, 48 weight arm, 50 weight, 52 crank, 54 air cylinder, 58 cylinder body, 62 piston rod, 64 connecting member, 100 unwinding device

Claims

1. In a dancer device for a web running in a forward and backward direction, a frame of the dancer device; a center shaft rotatably supported on the frame and horizontally in the left-right direction; a center roll provided coaxially and rotatably on the outer periphery of the center shaft; a pair of left and right roll arm portions protruding forward from the center shafts on both left and right sides of the center roll; a dancer roll rotatably supported at the tip of the roll arm and parallel to the center roll; a weight arm portion protruding rearward from the center shaft; a weight provided at the tip of the weight arm; a crank portion protruding radially outward from the center shaft; a cylinder provided in the frame for pressing the tip of the crank portion to rotate the center shaft; and The running web is stretched over the center roll and the dancer roll, The pair of left and right roll arm portions are maintained horizontally by the weight of the weight and the pressing force of the cylinder. A web dancer device comprising:

2. The cylinder body of the cylinder is provided on the frame in the vertical direction or the front-rear direction, A piston rod protruding from the cylinder body is connected to the crank portion via a connecting member.

2. The web dancer device according to claim 1.

3. A frame erected so as to extend in the front-to-rear direction from a horizontal base; a winding core supported by the frame so as to be horizontally rotatable in the left-right direction and around which a web is wound; a first dancer device provided on the frame in front of the winding core; a second dancer device provided on the frame behind the winding core; and The first dancer device is a first center shaft rotatably supported on the frame and horizontally in the left-right direction; a first center roll provided coaxially and rotatably on an outer periphery of the first center shaft; a pair of left and right first roll arm portions protruding forward from the first center shafts on both left and right sides of the first center roll; a first dancer roll rotatably supported at a tip of the first roll arm portion and parallel to the first center roll; a first weight arm portion protruding rearward from the first center shaft; a first weight provided at a tip of the first weight arm; a first crank portion protruding radially outward from the first center shaft; a first cylinder provided in the frame for pressing a tip end of the first crank portion to rotate the first center shaft; and the web unwound forward from the winding core is wound around the first center roll and the first dancer roll, the pair of left and right first roll arm portions are maintained horizontal by the weight of the first weight and the pressing force of the first cylinder, The second dancer device is a second center shaft rotatably supported on the frame and horizontally in the left-right direction; a second center roll provided coaxially and rotatably on the outer periphery of the second center shaft; a pair of left and right second roll arm portions protruding rearward from the second center shafts on both left and right sides of the second center roll; a second dancer roll rotatably supported at the tip of the second roll arm and parallel to the second center roll; a second weight arm portion protruding forward from the second center shaft; a second weight provided at a tip of the second weight arm; a second crank portion protruding radially outward from the second center shaft; a second cylinder provided in the frame for pressing a tip end of the second crank portion to rotate the second center shaft; and the web unwound rearward from the winding core is wound around the second center roll and the second dancer roll, the pair of left and right second roll arm portions are maintained horizontal by the weight of the second weight and the pressing force of the second cylinder; A web unwinding device characterized by:

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