JP2020015618A - Reel - Google Patents

Abstract

To provide a reel arranged on a central axis and capable of easily adjusting a compression force of an elastic ring supporting a core tube, enabling long-term winding even when disconnected from a compressed air source, and possible to be applied to core tubes of various lengths without damaging the elastic ring placed outside the core tube.SOLUTION: An elastic ring is compressed by a piston by applying adjusted compressed air pressure to an actuator and an air chamber provided inside a cylindrical central shaft, and when using a reel separated from a compressed air source, compressed air stored in the air chamber inside the central shaft minimizes an effect of air leak even when used for long periods, and an amount of compression of the elastic ring is restricted to prevent damage to the elastic ring arranged outside a range of the core tube, with a pin shorter than a width of the elastic ring embedded in the elastic ring, thereby responding to core tubes of various lengths.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a winding shaft that detachably supports a cylindrical core tube and winds a web such as a film in a roll around the supported core tube outer peripheral surface.

  The winding shaft is described in, for example, Patent Document 1. In Patent Literature 1, a plurality of elastic rings disposed on the outer periphery of the center shaft are axially pushed by pressing a piston of a cap provided at the tip of the center shaft (rotating cylinder) of the cantilever support with a spring. It compresses and expands in the radial direction to support the core tube (bobbin), supplies compressed air to the actuator section, and pushes back the spring with the piston, thereby releasing the compression of the elastic ring and releasing the support of the core tube. Like that.

  Further, the winding shaft is described in, for example, Patent Document 2. In Patent Literature 2, an elliptical arc-shaped portion having t corresponding to the minor axis of the ellipse and T corresponding to the major axis is formed at the bottom of the U-shaped stopper of the U-shape. By rotating the stopper around the intersection of t and T, the elastic ring (elastic material) is axially compressed and radially expanded by the difference between t and T to support the core tube (film core). I have.

  Further, the winding shaft is described in, for example, Patent Document 3. In Patent Document 3, a core nut (tube) is supported by tightening a lock nut or fitting a pin into a groove to compress an elastic ring (ring-shaped elastic body) in the axial direction and expand in the radial direction. are doing.

JP-A-10-36006 JP-A-60-132876 JP-A-54-156860

  In the winding shaft disclosed in Patent Literature 1, the axial compressive force and the radial expansion force on the elastic ring are determined by the strength of the spring. If the force of the spring is too strong for the core tube to be mounted, the core tube is deformed or broken. Conversely, if the spring force is too weak, the core tube will not be supported by the required force. There is no thing.

  If only a specific core tube is mounted on a single reel, there is no problem if a spring with the strength matching the specification of the core tube to be mounted is fine, but one reel has various specifications with different specifications. Core tube may be installed. In the winding shaft disclosed in Patent Document 1, it is necessary to replace the spring for each specification of the core tube in order to provide an appropriate supporting force for each of the various core tubes to be mounted. Absent.

  In the winding shaft disclosed in Patent Literature 2, the axial compression force and the radial expansion force on the elastic ring are determined by the difference between t and T of the arc-shaped portion formed on the fastener. If the difference between t and T is too large for the core tube to be mounted, the core tube is deformed or broken. Conversely, if the difference is too small, the core tube will not be supported with the required force. There is.

  In the case where only a specific core tube is mounted on one reel, there is no problem if a fastener having an arc-shaped portion of t and T suitable for the specification of the core tube is formed. One core may be equipped with various types of core tubes having different specifications. In the winding shaft disclosed in Patent Literature 2, an arc-shaped portion having an appropriate t and T is formed for each specification of the core tube in order to provide an appropriate supporting force for each of the various core tubes to be mounted. It is not practical because it is troublesome because it needs to be replaced with a fastener.

  In the case where a lock nut is used with the winding shaft disclosed in Patent Document 3, the compression force in the axial direction and the expansion force in the radial direction on the elastic ring are determined by the strength of the lock nut. By adjusting the force, it is possible to obtain an appropriate compression force according to the core tube to be mounted. However, when the winding shaft is used in a state where both ends are supported, an electric tool or the like cannot be connected to the lock nut, so that the lock nut has to be manually rotated and the operation is troublesome because it takes time and effort. Further, when a pin is used, an intermediate clamping force between the grooves cannot be obtained, so that it may not be possible to provide an appropriate supporting force for the core pipe to be mounted.

  In the winding shafts disclosed in Patent Documents 1 to 3, when the elastic ring disposed within the length of the core tube to be mounted is compressed in the width direction, the expansion in the outer diameter direction is reduced. Since it is limited by the inner diameter of the tube, the axial width of the elastic ring is not compressed below the value corresponding to the inner diameter of the core tube. However, when a short core tube is installed, there is nothing to restrict the expansion in the outer radial direction when the elastic ring disposed outside the length of the core tube is compressed in the width direction. In addition, the width in the axial direction becomes narrow without any restriction, and the elastic ring may cause permanent deformation or breakage beyond the elastic limit, which is not restored to the original shape.

  In view of the above problem of the winding shaft, the present invention compresses an annular elastic ring made of an elastic body disposed on the outer periphery of a cylindrical central shaft in the axial direction and expands in the radial direction, thereby forming a film or the like. In a reel that supports the cylindrical core tube that winds the web, releases the compression and releases the radial expansion to the initial state, thereby releasing the support of the core tube, even when the reel is used with both ends supported. Another object of the present invention is to provide a winding shaft capable of easily adjusting a compressive force applied to an elastic ring with a simple operation.

  Also, when a short core tube is used, the elastic ring arranged outside the core tube length range does not cause permanent deformation or breakage, and it corresponds to various lengths of core tube It is an object to provide a highly versatile reel that can be used.

  It is another object of the present invention to provide a reel in which the influence of a compressive force on an elastic ring due to air leakage is minimized when the reel is used while being separated from a compressed air source.

  In order to achieve the above object, a first winding shaft of the present invention axially compresses an annular elastic ring made of an elastic body disposed on the outer periphery of a cylindrical central shaft to expand radially. In the winding shaft that supports the cylindrical core tube by releasing the core tube by releasing the compression and returning the radial expansion to the initial state, the cylindrical central axis and the central axis A shaft end member for closing both ends and a piston provided inside the central shaft and slidably movable in the axial direction constitute an actuator chamber, and supply compressed air to the actuator chamber to form the piston. By sliding in the axial direction, compressing the elastic ring supports the core tube, discharging the compressed air, and releasing the compression of the elastic ring releases the support of the core tube. It was done.

  In the second reel of the present invention, in the first reel of the present invention described above, a plurality of pins shorter than the axial width of the elastic ring are embedded in the elastic ring in parallel with the axis. When the elastic ring is compressed in the axial direction, the elastic ring is compressed in the axial direction so that the axial width of the elastic ring is smaller than the length of the pin. The possible range is limited by the pins.

  The third winding shaft of the present invention is the first and second winding shafts of the present invention described above, wherein the cylindrical central shaft and the central shaft inside the piston in the axial direction are mutually separated. An air chamber is constituted by the partition member provided in the opposed shape, and the air chamber and the actuator chamber are communicated with each other.

  According to the present invention, an annular elastic ring made of an elastic body disposed on the outer periphery of a cylindrical central shaft is compressed in the axial direction and expanded in the radial direction, thereby winding a web such as a film. A simple operation can be performed even when the winding shaft is used in a state where the winding shaft is supported at both ends by supporting the core tube, releasing the compression and returning the radial expansion to the initial state to release the support of the core tube. Therefore, it is possible to easily adjust the axial compression force of the elastic ring adapted to the specification of the core tube to be used.

  Also, when a short core tube is used, the elastic ring arranged outside the length range of the core tube does not cause permanent deformation or breakage, and it corresponds to core tubes of various lengths A highly versatile reel can be obtained.

  Further, when the winding shaft is used separately from the compressed air source, the influence on the axial compression force of the elastic ring due to the decrease in the air pressure caused by the compressed air leakage can be reduced.

FIG. 2 is a schematic longitudinal sectional view of the winding shaft according to the first embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing a state in which the core tube is supported in the winding shaft according to the first embodiment of the present invention. FIG. 9 is a schematic longitudinal sectional view showing a state in which elastic rings are provided within and outside a length of a core tube in a winding shaft according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, showing a state of arrangement of pins in a winding shaft according to a second embodiment of the present invention. It is an outline longitudinal section of a spool concerning a 3rd embodiment of the present invention.

  Hereinafter, embodiments of a winding shaft according to the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show a first embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional view showing a state before supporting a core tube in a winding shaft according to the first embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing a state where the core tube is supported on the winding shaft according to the first embodiment of the present invention.

  As shown in FIG. 1, a cylindrical central shaft 2, a shaft end member 6 for closing both ends of the central shaft 2, and a piston 9 provided inside the central shaft 2 and freely sliding in the axial direction. , The actuator chamber 20. Both ends of the rubber tube 7 are fixed to the shaft end member 6 and the piston 9 by the pressing member 8, and the actuator chamber 20 is in an airtight state. The air port 12 having a check valve function and the actuator chamber 20 communicate with each other, and the left and right actuator chambers 20 communicate with each other via an elastic hose 18 which can be extended and contracted.

  A plurality of elastic rings 4 and collars 5 are alternately arranged in the axial direction on the outer periphery of the central shaft 2. A push pin 10 integral with the piston 9 is formed on the outer peripheral portion of the center shaft 2 and is in contact with the collar 5 through an elongated hole 11 extending in the axial direction.

  The elastic ring 4 and the collar 5 are provided on the outer peripheral surface of the center shaft 2 so as to be movable in the axial direction. The outer peripheral surfaces of the elastic ring 4, the collar 5 and the push pin 10 and the inner peripheral surface of the core tube 3 have a gap for easy attachment and detachment of the core tube 3.

  FIG. 1 shows an initial state in which the winding shaft 1 is inserted through the core tube 3. When compressed air is supplied to one actuator chamber 20 by connecting a compressed air source (not shown) to the air port 12, the elastic hose 18 is turned on. Compressed air is also supplied to the other actuator chamber 20 via the shaft, and both pistons 9 move inward in the axial direction while stretching the rubber tube 7 as shown in FIG. Moves the collar 5 to compress the elastic ring 4, and the elastic ring 4 expands in the radial direction and closely contacts the outer periphery of the central shaft 2 and the inner periphery of the core tube 3 to support the core tube 3.

  By using a pressure adjusting valve and a pressure gauge (not shown) to adjust the pressure according to the specification of the core pipe 3 to be mounted and to supply the compressed air, the elastic ring 4 is compressed with an appropriate compressing force to have an appropriate diameter. Since the expansion force in the direction can be obtained, the core tube 3 is not deformed or broken, and the supporting force on the core tube 3 is not too weak, and the core tube 3 is appropriately supported. Can be done.

  When the compressed air is discharged from the air port 12 with the check valve function disabled, the piston 9 is returned to the initial position by the restoring force of the stretched rubber tube 7, and is compressed in the axial direction and expanded in the radial direction. Each elastic ring 4 returns to the initial state by its own elasticity, and the core tube 3 can be easily removed from the winding shaft 1.

  Since the operation of supplying and discharging the compressed air can be performed from the air port 12, the operation of supplying and discharging the compressed air can be easily performed even when the reel 1 is used in a state where both ends are supported.

  3 and 4 show a second embodiment of the present invention, and FIG. 3 is a schematic longitudinal sectional view showing a state in which a short core tube is attached to a winding shaft according to the second embodiment of the present invention. FIG. 4 is a sectional view taken along the line AA in FIG. 3, showing the arrangement state of the pins.

  As shown in FIGS. 3 and 4, a plurality of pins 41 are arranged in a circle in parallel with the axis at an interval and embedded in the elastic ring 40. The length W of the pin 41 is shorter than the axial width of the elastic ring 4 supporting the core tube 3 and does not exceed the elastic limit of the elastic ring 4.

  The length W of the pin 41 is shorter than the axial width of the elastic ring 4 supporting the core tube 3 and does not affect the support of the elastic tube 4 by the elastic ring 4. The function, operation, and the like of the elastic ring 40 disposed within the range of L are the same as those in the first embodiment.

  On the other hand, when the elastic ring 40 disposed outside the range of the length L of the core tube 3 is axially compressed by the collar 5 pushed by the push pin 10 integral with the piston 9, the adjacent collar 5 Since the distance between the pins 41 is limited by the pin 41 and is not narrower than the length W of the pin 41, the axial width of the elastic ring 40 is not less than the length W of the pin 41. Therefore, the elastic ring 40 disposed outside the range of the length L of the core tube 3 does not undergo permanent deformation or breakage.

  FIG. 5 shows a third embodiment of the present invention, and FIG. 5 is a schematic longitudinal sectional view showing a state before supporting a core tube in a winding shaft according to the third embodiment of the present invention.

  As shown in FIG. 5, the winding shaft 21 forms an air chamber 17 inside the central shaft 2 on the inner side in the axial direction of the piston 9 with the partition member 14 disposed opposite to and fixed to the central shaft 2. I have. The actuator chamber 20 and the air chamber 17 communicate with each other via an elastic hose 15 that can be extended and contracted.

  FIG. 5 shows an initial state in which the winding shaft 1 is inserted through the core tube 3. When compressed air is supplied from an unillustrated compressed air source to the actuator chamber 20 and the air chamber 17 through the air port 12, the piston 9 The telescopic elastic hose 15 is moved inward in the axial direction while contracting. Subsequent functions, operations, and the like are the same as in the first embodiment.

  When the supply of the compressed air to the winding shaft 21 is completed, the air port 12 is disconnected from the air source, and may be used in a state where the compressed air is sealed. It is difficult to make the actuator chamber 20 completely airtight, and if it takes a long time from the start to the end of winding the web, the enclosed compressed air may gradually leak. If the amount of stored compressed air is small, even a small amount of leakage has a large effect on air pressure, and it may not be possible to maintain an appropriate air pressure.

  Since the volume of the air chamber 17 can be increased in the main winding shaft 21, a large volume of compressed air can be stored. Even when the winding shaft 21 is separated from the air source, the compressed air leaks. The effect of volume can be minimized.

  The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are necessarily essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1 Winding shaft 2 Center shaft 3 Core tube 4 Elastic ring 5 Collar 6 Shaft end member 7 Rubber tube 8 Holding member 9 Piston 10 Push pin 11 Long hole 12 Air port 14 Partition member 15 Elastic hose 17 Air chamber 18 Elastic hose 20 Actuator chamber 21 Reel 40 Resilient ring 41 Pin W Pin length L Core tube length

  The present invention relates to a winding shaft that detachably supports a cylindrical core tube and winds a web such as a film in a roll around the supported core tube outer peripheral surface.

  The winding shaft is described in, for example, Patent Document 1. In Patent Literature 1, a plurality of elastic rings disposed on the outer periphery of the center shaft are axially pushed by pressing a piston of a cap provided at the tip of the center shaft (rotating cylinder) of the cantilever support with a spring. It compresses and expands in the radial direction to support the core tube (bobbin), supplies compressed air to the actuator section, and pushes back the spring with the piston, thereby releasing the compression of the elastic ring and releasing the support of the core tube. Like that.

  Further, the winding shaft is described in, for example, Patent Document 2. In Patent Literature 2, an elliptical arc-shaped portion having t corresponding to the minor axis of the ellipse and T corresponding to the major axis is formed at the bottom of the U-shaped stopper of the U-shape. By rotating the stopper around the intersection of t and T, the elastic ring (elastic material) is axially compressed and radially expanded by the difference between t and T to support the core tube (film core). I have.

  Further, the winding shaft is described in, for example, Patent Document 3. In Patent Document 3, a core nut (tube) is supported by tightening a lock nut or fitting a pin into a groove to compress an elastic ring (ring-shaped elastic body) in the axial direction and expand in the radial direction. are doing.

JP-A-10-36006 JP-A-60-132876 JP-A-54-156860

  In the winding shaft disclosed in Patent Literature 1, the axial compressive force and the radial expansion force on the elastic ring are determined by the strength of the spring. If the force of the spring is too strong for the core tube to be mounted, the core tube is deformed or broken. Conversely, if the spring force is too weak, the core tube will not be supported by the required force. There is no thing.

  If only a specific core tube is mounted on a single reel, there is no problem if a spring with the strength matching the specification of the core tube to be mounted is fine, but one reel has various specifications with different specifications. Core tube may be installed. In the winding shaft disclosed in Patent Document 1, it is necessary to replace the spring for each specification of the core tube in order to provide an appropriate supporting force for each of the various core tubes to be mounted. Absent.

  In the winding shaft disclosed in Patent Literature 2, the axial compression force and the radial expansion force on the elastic ring are determined by the difference between t and T of the arc-shaped portion formed on the fastener. If the difference between t and T is too large for the core tube to be mounted, the core tube is deformed or broken. Conversely, if the difference is too small, the core tube will not be supported with the required force. There is.

  In the case where only a specific core tube is mounted on one reel, there is no problem if a fastener having an arc-shaped portion of t and T suitable for the specification of the core tube is formed. One core may be equipped with various types of core tubes having different specifications. In the winding shaft disclosed in Patent Literature 2, an arc-shaped portion having an appropriate t and T is formed for each specification of the core tube in order to provide an appropriate supporting force for each of the various core tubes to be mounted. It is not practical because it is troublesome because it needs to be replaced with a fastener.

  In the case where a lock nut is used with the winding shaft disclosed in Patent Document 3, the compression force in the axial direction and the expansion force in the radial direction on the elastic ring are determined by the strength of the lock nut. By adjusting the force, it is possible to obtain an appropriate compression force according to the core tube to be mounted. However, when the winding shaft is used in a state where both ends are supported, an electric tool or the like cannot be connected to the lock nut, so that the lock nut has to be manually rotated and the operation is troublesome because it takes time and effort. Further, when a pin is used, an intermediate clamping force between the grooves cannot be obtained, so that it may not be possible to provide an appropriate supporting force for the core pipe to be mounted.

In the winding shafts disclosed in Patent Documents 1 to 3, when the elastic ring disposed within the length of the core tube to be mounted is compressed in the axial direction, the expansion in the outer diameter direction is reduced. Since it is limited by the inner diameter of the tube, the axial width of the elastic ring is not compressed below a value corresponding to the inner diameter of the core tube. However, when a short core tube is installed, there is nothing that restricts the expansion in the outer diameter direction when the elastic ring disposed outside the length of the core tube is compressed in the axial direction. In addition, the width in the axial direction becomes narrow without any restriction, and the elastic ring may cause permanent deformation or breakage beyond the elastic limit, which is not restored to the original shape.

In view of the above problem of the winding shaft , the present invention includes a cylindrical central shaft, a shaft end member for closing both ends of the central shaft, and a piston provided inside the central shaft and freely sliding in the axial direction. , An actuator chamber is formed, compressed air is supplied to the actuator chamber, the piston is slid in the axial direction, and an annular elastic ring made of an elastic body disposed on the outer periphery of the cylindrical central shaft is moved in the axial direction. By supporting the cylindrical core tube for winding a web such as a film by compressing and expanding in the radial direction, the support of the core tube is released by releasing the compression and returning the radial expansion to the initial state. in winding shaft, even when using a reel at each end supported state, by a simple operation, it can easily adjust the compressive force on the elastic ring, further, when using disconnect the winding shaft from the compressed air source, the air Minimize the effect of compressive force on the elastic ring due to leakage It is an object of the present invention to provide a winding shaft that was Mel so.

  Also, when a short core tube is used, the elastic ring arranged outside the core tube length range does not cause permanent deformation or breakage, and it corresponds to various lengths of core tube It is an object to provide a highly versatile reel that can be used.

In order to achieve the above object, a first winding shaft of the present invention has a cylindrical central shaft, a shaft end member that closes both ends of the central shaft, and is provided inside the central shaft and is free in the axial direction. An actuator chamber is constituted by a piston that slides on the actuator chamber, compressed air is supplied to the actuator chamber, the piston is slid in the axial direction, and an annular ring made of an elastic body is disposed on the outer periphery of the central shaft. By compressing the elastic ring in the axial direction and expanding in the radial direction, the cylindrical core tube is supported, and the support of the core tube is released by releasing the compression and returning the radial expansion to the initial state. In the winding shaft, an air chamber is formed by the center axis and a partition member disposed inside the center axis in an axially inner side of the piston and opposed to each other, and the air chamber and the actuator chamber are formed. DOO communicates is, the actuator chamber By supplying compressed air, sliding the piston in the axial direction, compressing the elastic ring, supporting the core tube, discharging the compressed air, and releasing the compression of the elastic ring. The support of the core tube is released.

In the second reel of the present invention, in the first reel of the present invention described above, a plurality of pins shorter than the axial width of the elastic ring are embedded in the elastic ring in parallel with the axis. In this state, when the elastic ring is compressed in the axial direction, the axially compressible range of the elastic ring is limited by the pin so that the elastic ring is not compressed beyond its elastic limit. It was done.

According to the present invention, an annular elastic ring made of an elastic body disposed on the outer periphery of a cylindrical central shaft is compressed in the axial direction and expanded in the radial direction, thereby winding a web such as a film. A simple operation can be performed even when the winding shaft is used in a state where the winding shaft is supported at both ends by supporting the core tube, releasing the compression and returning the radial expansion to the initial state to release the support of the core tube. Therefore, it is possible to easily adjust the axial compression force of the elastic ring according to the specifications of the core tube to be used , and furthermore, when the winding shaft is separated from the compressed air source and used, the air pressure generated by the compressed air leakage decreases Therefore, the influence of the elastic ring on the axial compression force can be reduced.

  Also, when a short core tube is used, the elastic ring arranged outside the length range of the core tube does not cause permanent deformation or breakage, and it corresponds to core tubes of various lengths A highly versatile reel can be obtained.

FIG. 2 is a schematic longitudinal sectional view of the winding shaft according to the first embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing a state in which the core tube is supported in the winding shaft according to the first embodiment of the present invention. FIG. 9 is a schematic longitudinal sectional view showing a state in which elastic rings are provided within and outside a length of a core tube in a winding shaft according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, showing a state of arrangement of pins in a winding shaft according to a second embodiment of the present invention.

  Hereinafter, embodiments of a winding shaft according to the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show a first embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional view showing a state before supporting a core tube in a winding shaft according to the first embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing a state where the core tube is supported on the winding shaft according to the first embodiment of the present invention.

  As shown in FIG. 1, a cylindrical central shaft 2, a shaft end member 6 for closing both ends of the central shaft 2, and a piston 9 provided inside the central shaft 2 and freely sliding in the axial direction. , The actuator chamber 20. Both ends of the rubber tube 7 are fixed to the shaft end member 6 and the piston 9 by the pressing member 8, and the actuator chamber 20 is in an airtight state.

An air chamber 17 is formed inside the central shaft 2 inside the piston 9 in the axial direction by a partition member 14 which is disposed to face the central shaft 2 in a fixed state. The air port 12 having a check valve function and the actuator chamber 20 communicate with each other. The left and right actuator chambers 20 communicate with the air chamber 17 via an elastic hose 15 which can be extended and contracted.

  A plurality of elastic rings 4 and collars 5 are alternately arranged in the axial direction on the outer periphery of the central shaft 2. A push pin 10 integral with the piston 9 is formed on the outer peripheral portion of the center shaft 2 and is in contact with the collar 5 through an elongated hole 11 extending in the axial direction.

  The elastic ring 4 and the collar 5 are provided on the outer peripheral surface of the center shaft 2 so as to be movable in the axial direction. The outer peripheral surfaces of the elastic ring 4, the collar 5 and the push pin 10 and the inner peripheral surface of the core tube 3 have a gap for easy attachment and detachment of the core tube 3.

FIG. 1 shows an initial state in which the winding shaft 1 is inserted through the core tube 3. When compressed air is supplied to one actuator chamber 20 by connecting a compressed air source (not shown) to the air port 12, an elastic hose 15 is provided. Compressed air is also supplied to the other actuator chamber 20 via the air chamber 17 and both pistons 9 move inward in the axial direction while stretching the rubber tube 7 as shown in FIG. The push pin 10 moves the collar 5 to compress the elastic ring 4, and the elastic ring 4 expands in the radial direction and closely contacts the outer periphery of the central shaft 2 and the inner periphery of the core tube 3 to support the core tube 3.

  By using a pressure adjusting valve and a pressure gauge (not shown) to adjust the pressure according to the specification of the core pipe 3 to be mounted and to supply the compressed air, the elastic ring 4 is compressed with an appropriate compressing force to have an appropriate diameter. Since the expansion force in the direction can be obtained, the core tube 3 is not deformed or broken, and the supporting force on the core tube 3 is not too weak, and the core tube 3 is appropriately supported. Can be done.

  When the compressed air is discharged from the air port 12 with the check valve function disabled, the piston 9 is returned to the initial position by the restoring force of the stretched rubber tube 7, and is compressed in the axial direction and expanded in the radial direction. Each elastic ring 4 returns to the initial state by its own elasticity, and the core tube 3 can be easily removed from the winding shaft 1.

  Since the operation of supplying and discharging the compressed air can be performed from the air port 12, the operation of supplying and discharging the compressed air can be easily performed even when the reel 1 is used in a state where both ends are supported.

  3 and 4 show a second embodiment of the present invention, and FIG. 3 is a schematic longitudinal sectional view showing a state in which a short core tube is attached to a winding shaft according to the second embodiment of the present invention. FIG. 4 is a sectional view taken along the line AA in FIG. 3, showing the arrangement state of the pins.

As shown in FIGS. 3 and 4, a plurality of pins 41 are arranged in a circle in parallel with the axis at an interval and embedded in the elastic ring 40. The length W of the pin 41 is shorter than the axial width of the elastic ring 40 supporting the core tube 3 and does not exceed the elastic limit of the elastic ring 40 .

The length W of the pin 41 is shorter than the axial width of the elastic ring 4 supporting the core tube 3 and does not affect the support of the elastic tube 40 by the elastic ring 40. The function, operation, and the like of the elastic ring 40 disposed within the range of the length L are the same as those of the first embodiment.

On the other hand, when the elastic ring 40 disposed outside the range of the length L of the core tube 3 is axially compressed by the collar 5 pushed by the push pin 10 integral with the piston 9, the adjacent collar 5 Since the distance between the pins 41 is limited by the pin 41 and is not narrower than the length W of the pin 41, the axial width of the elastic ring 40 is not less than the length W of the pin 41. Since the length W of the pin 41 does not exceed the elastic limit of the elastic ring 40, the elastic ring 40 provided outside the range of the length L of the core tube 3 does not undergo permanent deformation or breakage. I have nothing to do.

When the supply of the compressed air to the reel 1 is completed, the air port 12 is cut off from the air source, and the reel 1 may be used with the compressed air sealed therein. It is difficult to make the actuator chamber 20 completely airtight, and if it takes a long time from the start to the end of winding the web, the enclosed compressed air may gradually leak. If the amount of stored compressed air is small, even a small amount of leakage has a large effect on air pressure, and it may not be possible to maintain an appropriate air pressure.

Since the volume of the air chamber 17 can be increased in the main reel 1 , a large volume of compressed air can be stored. Even when the reel 1 is used separately from the air source, the leakage of the compressed air can be prevented. The effect of volume can be minimized.

  The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are necessarily essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1 Winding shaft 2 Center shaft 3 Core tube 4 Elastic ring 5 Collar 6 Shaft end member 7 Rubber tube 8 Holding member 9 Piston 10 Push pin 11 Long hole 12 Air port 14 Partition member 15 Elastic hose 17 Air chamber 20 Actuator chamber 40 Elastic ring 41 pin W pin length L core tube length

Claims (3)

An annular elastic ring made of an elastic body disposed on the outer periphery of the cylindrical central shaft is compressed in the axial direction and expanded in the radial direction to support the cylindrical core tube, and the compression is released and the radial direction is released. A winding shaft that releases support of the core tube by returning expansion to an initial state;
An actuator chamber is constituted by the cylindrical central shaft, a shaft end member that closes both ends of the central shaft, and a piston provided inside the central shaft and sliding freely in the axial direction. Supplying compressed air to the chamber, sliding the piston in the axial direction, compressing the elastic ring, supporting the core tube, discharging the compressed air, and releasing the compression of the elastic ring. A spool for releasing the support of the core tube. The reel according to claim 1,
A plurality of pins shorter than the width of the elastic ring in the axial direction are arranged in a state embedded in the elastic ring in parallel with the axis, and when the elastic ring is compressed in the axial direction, the elasticity of the elastic ring is reduced. A winding shaft in which the axially compressible range of the elastic ring is limited by the pin so that the axial width of the ring is smaller than the length of the pin and is not compressed. In the winding shaft according to claim 1 and claim 2,
The cylindrical central axis, and a partition member disposed opposite to each other inside the central axis axially inside the piston, constitute an air chamber, the air chamber and the actuator chamber and Is connected to the reel.

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