JP5319812B2 - Chuck device - Google Patents

Description

  The present invention relates to a chuck device for holding a cylindrical body for winding / unwinding a web, and in particular, a chuck body in which a chuck portion is inserted into a cylindrical body to hold the cylindrical body. The present invention relates to a chuck device having the structure described above.

  Conventionally, webs such as various synthetic resin films and paper patterns are held in a state of being wound around a cylindrical body (hollow shaft). In the web production line, the produced web is wound around a cylindrical body, and in the processing apparatus, the web wound around the tubular body is fed out and sent to a processing apparatus.

  The chuck device that chucks the cylindrical body from the inner peripheral side during the winding / unwinding of the web functions as a holding shaft for the cylindrical body. Various proposals have been made regarding this type of chuck device. (For example, JP 2003-97587 A: Patent Document 1; JP 2010-249192 A: Patent Document 2).

A conventional chuck device will be described with reference to FIGS.
FIG. 8 is an external view of the chuck device, and FIG. 9 is an explanatory diagram of a cross-sectional structure.

  As shown in FIGS. 8 to 9, in the chuck device, a tube unit is provided in a space surrounded by the main body a and the lid e of the outer structure.

  The tube unit includes an expanded body (tube) b, a first tube nipple c, a second tube nipple d, a stopper (C-type retaining ring) g, two O-rings h, h, and a SUS (stainless steel) steel wire i. , Pipe j, knob (hexagon socket head cap bolt) k, first and second tube nipples c and d, and two protective tapes m and m.

  In the chuck device, an expansion body b made of a short rubber tube is mounted in a cylindrical main body a opened on one side. The expansion body b is mounted in the main body a with the first tube nipple c fixed to one end on the base side of the main body a and the second tube nipple d fixed to the other end in an airtight manner. The In the main body a, the first tube nipple c is mounted in contact with the back side in the axial direction, and on the opening side of the main body a, a lid e is provided so as to hold the other second tube nipple d. It is fixed with screws. In the expansion body b, the pipe j is sandwiched between the first tube nipple c and the second tube nipple d, and the interval is maintained.

  Further, the main body a is provided with a lug unit in which the lug body f is reciprocally operable by inserting the lug body f inward and outward through a plurality of through holes in the peripheral wall portion.

The tube unit is manufactured as follows.
(1) The expansion body b has a simple cylindrical shape, and is used by cutting a tube material such as a long rubber into a predetermined length.
(2) The first tube nipple c is inserted into one end portion (air introduction side) of the expansion body b. The first tube nipple c having a cylindrical shape has a groove into which a C-shaped retaining ring serving as a stopper g is fitted in a substantially central portion, and one side (air introduction side) serves as an air seal. A groove into which an O-ring (O-ring) h is fitted is machined, and a V-shaped groove serving as a guide for binding the expansion body b with the SUS (stainless steel) steel wire i is formed on the other side (expansion body b side). Two places are processed.

  A through hole c1 is formed in the central portion of the first tube nipple c, and this through hole c1 serves as a passage for sending compressed air into the expansion body b.

  In addition, a protruding portion that holds the pipe j at the center position when the pipe j is assembled into the expansion body b is provided at the distal end portion of the first tube nipple c on the expansion body b side.

  The outer diameter of the first tube nipple c is slightly larger than the inner diameter of the expansion body b in order to easily maintain the sealing performance of the compressed air.

  For this reason, when inserting the 1st tube nipple c in the expansion body b, it is difficult to insert unless the lubricant (soap etc.) is applied to the outer peripheral part.

The expansion body b is inserted almost to the position of the stopper g.
A protective tape is wound around the first tube nipple c at the position of the V-shaped groove, and then the SUS steel wire i is wound 2 to 3 times, and then the SUS steel wire i wound by twisting up both ends is tightened.

  This protective tape is intended to prevent the SUS steel wire i from being sunk into the expansion body b and causing cracks (cause of puncture).

(3) Put pipe j in the inside of the expansion body b An air vent hole is appropriately processed in the pipe j.
The pipe j is inserted into the convex portion of the first tube nipple c.

(4) Insert the “second tube nipple d” into the other end of the expansion body b. The cylindrical second tube nipple d is a guide when the expansion body b is tied to the outer periphery with the SUS steel wire i. Two V-grooves are processed.

  In addition, a protruding portion that holds the pipe j at the center position when the pipe j is assembled is provided at a tip portion toward the inside of the expansion body b.

  A hexagon socket head cap screw serving as a knob k when the tube unit is pulled out from the inside of the main body a is screwed into the other end of the second tube nipple d toward the lid e.

  Insertion of the second tube nipple d into the expansion body b is performed by applying a lubricant as in the case of the first tube nipple c until the pipe j is put in the convex portion and the end surface of the first tube nipple c hits. Push in.

  In addition, since the inside of the expansion body b cannot be visually observed, it is necessary to set the pipe j to a convex part by groping. The size of the tube unit is determined by setting the pipe j.

After the protective tape is wound around the V-groove position, the SUS steel wire i is wound 2 to 3 times, and then the SUS steel wire i wound by winding up both ends is tightened.
With the above operation, the tube unit is completed.

(5) Assemble the tube unit into the “main body”.
Put the tube unit into the hollow part of the main body a and push it to the position where it stops with the stopper g. Then, the lid e is inserted into the end of the main body a and fixed with a push screw or the like.
Since there is the pipe j, the tube unit can be inserted without buckling.

(6) Cylinder is clamped by supplying compressed air to the chuck device.

  However, the above chuck device has the following problems.

  A) The tube unit and the chuck have a structure in which both ends of the expandable body are axially developed and attached to the first tube nipple c and the second tube nipple d and the outer periphery thereof is bound with the SUS steel wire i. The overall length of the apparatus has become long, and this has been an obstacle to shortening the width of equipment for handling cylindrical bodies by the chuck apparatus.

  B) Further, in the chuck device, each end of the expansion body b is tied to the first tube nipple c and the second tube nipple d by the SUS steel wire i to be kept airtight. Since the compressed air is supplied into the expansion body b to operate the lug, the sealing is required to be reliable. However, if the SUS steel wire i is not fixed, it is difficult to ensure airtightness.

  C) If the binding is made more than necessary, the expanding body b will crack, and a protective tape will be required, which will require a skill in assembly.

  D) In addition, an expansion body b, a first tube nipple c, a second tube nipple d, a stopper (C-type retaining ring) g, two o-rings h are provided in a tube unit surrounded by the main body a and the lid e. SUS steel wire i, pipe j, knob (hexagonal socket bolt) k, and two protective tapes, but further reduction in the number of parts has been demanded.

  E) The tube unit is assembled by inserting the tube b between the first tube nipple c and the second tube nipple d with the pipe j and inserting it into the main body a. Is removed from the main body a, it is difficult to remove the expansion body b due to the extension.

JP 2003-97587 A JP 2010-249192 A

  In view of the above problems, an object of the present invention is to provide a chuck device capable of shortening the length of a chuck portion of the chuck device and shortening a stroke when a cylindrical body is attached and detached.

  Another object of the present invention is to provide a chuck device that reduces the number of parts such as a tube unit, minimizes manual work during assembly, stabilizes the sealing performance of the expansion body, and improves work efficiency. .

  It is another object of the present invention to provide a chuck device that can be removed easily and can be removed at the same time that the lid and the expander are integrated to remove the cover.

In the present invention, an opening is formed at one end of a substantially cylindrical main body, and a lug body that can project from the outer peripheral surface of the main body and an expansion body for applying an operating force to the lug body are accommodated in the main body. The opening is closed with a lid, the body is mounted inside a cylindrical body to be held, and fluid pressure is applied to the inflated body so that the lug body protrudes from the outer peripheral surface of the body. In the chuck device that holds the cylindrical body from the inside,
Provide a pressing member for hitting the end of the expansion body inside the other side of the main body,
A shaft is provided in the substantially cylindrical expansion body in the main body,
A flange-like portion is provided at both axial ends of the shaft body, and first concave and convex surface portions are respectively formed on the axially outer surfaces of the flange-like portions at both ends,
A second uneven surface portion is provided on the inner side in the axial direction of the lid body and the pressing member so as to oppose the outer surface in the axial direction of the flange-like portion at both ends, and the expansion body is folded back in the center direction of the shaft body. The folded portion at both ends of the inflatable body is sandwiched between the first uneven surface portion and the second uneven surface portion, and the interval is narrowed by means for narrowing the sandwiching interval so that the folded portion is kept airtight. This is a chuck device characterized in that

  In the present invention, on the inner surfaces of both sides in the axial direction of the lid body and the pressing member, a tapered slope is formed in a portion from the vicinity of the center in the axial direction toward the second concavo-convex surface. It is preferable that folding of both end portions of the expansion body is formed along the uneven surface portion.

  In the present invention, the second concavo-convex surface portion has a substantially bowl-like shape provided separately from the inner surface of the lid that closes the opening on one side of the main body and the other side in the axial direction of the main body. It is preferable that it is formed respectively on the inner surface of the pressing member.

  In the present invention, the means for narrowing the clamping interval includes a female screw hole formed in one side end portion and the other side end portion of the shaft body, and a lid member and a pressing member screwed into the female screw hole. It is preferable to have a male screw that is fastened and fixed to the body, and that the clamping interval can be reduced by tightening the male screw into the female screw hole.

  Further, in the present invention, a communication hole is formed in the shaft body from the other end, and the communication hole opens toward the inside of the expansion body on the side surface of the central portion of the shaft body. A male screw that is screwed into the hole has a hollow structure that communicates with the communication hole, and the hollow structure communicates with an introduction path that introduces fluid from the outside of the main body, via the introduction path, the hollow structure, and the communication hole. It is preferable that a fluid can be sent into the expansion body.

  In the present invention, the pressing member is slidably attached to the inner surface of the other end portion in the main body, and airtightness is maintained between the inner surface of the other end portion in the main body and the outer peripheral surface of the pressing member. It is preferable that a seal member is provided.

  In the present invention, it is preferable that the fixing means for fixing the lid body to the main body is a member that is separate from the male screw for fixing the lid body to the shaft body and fixes the outer peripheral portion of the lid body to the main body. It is.

  According to the chuck device of the present invention, the expanding body has a shape in which the both end portions are folded back in the center direction of the shaft, and the folded portion of the both end portions of the expanding body is formed by the first uneven surface portion and the second uneven surface portion. Since the gap is narrowed by means of narrowing the gap and the gap is narrowed so that the folded portion is kept airtight, both ends of the expansion body are folded and folded, and the length of the main body of the chuck device is folded. Therefore, the stroke can be shortened as compared with the case where the cylindrical body is not attached.

  Since the folded portions at both end portions of the expansion body are sandwiched between the first uneven surface portion and the second uneven surface portion, the interval is narrowed by means for narrowing the sandwiching interval so as to keep the folded portion airtight. The airtightness of the expansion body can be reliably sealed by tightening between the first uneven surface portion and the second uneven surface portion.

  In the present invention, on the inner surfaces of both sides in the axial direction of the lid and the pressing member, a slope that tapers from the vicinity of the center in the axial direction toward the second uneven surface is formed. By forming folds at both end portions of the expansion body along the uneven surface portion 2, the expansion body can be compressed by the inclined surface portion to improve the airtightness compared to the cylindrical inner surface. The outer periphery of the end portion of the expansion body can be securely fixed by the portion, and damage to the pressing member can be prevented.

This will be specifically described with reference to FIG. 7A shows a comparative example of a pressing member having a cylindrical inner surface instead of a slope, FIG. 7B shows the vicinity of the pressing member 32 of the embodiment in which the slope 30 is formed as an example of the present invention, and FIG. The extension at the time of injection of compressed air is shown. The same reference numerals denote the same parts as those in the embodiment of FIGS.
As shown in FIG. 7C, the inner diameter of the expansion body 14 before the injection of compressed air is φD, but the inner diameter expands to φD ′ by the compressed air injection. At the time of expansion, a tensile force P is applied and the periphery of the end portion sandwiched between the main bodies of the expansion body 14 is extended. In addition, a folded portion 14b that is bent in the diameter-reducing direction is formed at the end of the expansion body 14 in the axial direction. In the comparative example and the present invention, deformation and force are applied differently in the portion near the end of the inflatable body 14 when inflating.

In the comparative example of FIG. 7 (a), the pressing member p has a generally bowl shape but is formed on the cylindrical inner surface q, and the second uneven surface portion 22 is formed at the bottom thereof.
In the comparative example, even if the pressing member is in a state where the end portion of the expansion body 14 is sandwiched between the first uneven surface portion 20a and the second uneven surface portion 22, at this end portion, the cylinder connected to the folded portion 14b. Since the cylindrical portion (cylindrical portion) 14a is cylindrical, the cylindrical inner surface q is easily moved back and forth. Therefore, while it is easy to mount the expansion body 14, a tensile force P due to expansion is generated when compressed air is injected into the expansion body 14 in this mounting state. The cylindrical portion 14a connected to the folded portion 14b has a thickness t at the time of mounting. However, the tensile force P reduces the thickness to the thickness t ′, and the cylindrical portion 14a is easily moved. It becomes easy to pull out the end of the. Further, since the pulling force P from the expansion body 14 is not suppressed by the cylindrical inner surface q of the pressing member p, the pulling force P concentrates on the corners of the ring-shaped protrusions of the first uneven surface portion 20a of the flange-shaped portion 20. As a result, a large strain may be generated and damaged.

  On the other hand, in the present invention, as shown in FIG. 7B, when the end portion of the expansion body 14 is sandwiched between the pressing member 32 and the flange-shaped portion 20, the inclined surface 30 of the pressing member 32 is expanded. By compressing and reducing the outer diameter of the inclined portion (compressed portion) 14c at the end of 14, the inclined surface 30 compresses the expansion body 14 and improves the airtightness. Further, since the slope 30 sandwiches the compression portion 14c obliquely and restricts the movement of the expansion body 14, the convexity of the first uneven surface portion 20a and the second uneven surface portion 22 when the expansion body 14 is inflated with compressed air. The force acting on the portion is alleviated, and the inflatable body 14 does not suffer from problems such as breakage.

  The second concavo-convex surface portion includes an inner side surface of a lid that closes an opening on one side of the main body, and an inner side surface of a generally bowl-shaped pressing member provided separately from the main body inside the other side in the axial direction of the main body. Therefore, when the expansion body is attached or removed, it can be attached to or removed from the main body of the chuck device with the expansion body unit in a state where the cover body and the pressing member are assembled to the shaft body. Since it is not necessary to disassemble the shaft body from the expansion body, it is extremely easy to attach and remove the expansion body to the main body compared to the conventional case where the expansion body is handled separately. Therefore, the work time can be shortened.

  Further, the means for narrowing the clamping interval includes a female screw hole formed at one side end and the other side end of the shaft body, and a lid and a pressing member screwed into the female screw hole to the shaft body. It has a male screw that is fastened and fixed. By tightening the male screw into the female screw hole, the clamping interval can be narrowed, so that the airtightness of the expansion body can be easily adjusted by tightening the male screw.

  Further, a communication hole is formed in the shaft body from the other end, and the communication hole opens toward the inside of the expansion body at the side surface of the central portion of the shaft body, and is screwed into the female screw hole of the other end portion. The male screw has a hollow structure communicating with the communication hole, the hollow structure communicates with an introduction path for introducing fluid from the outside of the main body, and the inside of the expansion body via the introduction path, the hollow structure and the communication hole. Since the fluid can be fed, the fluid can be surely fed into the expansion body from the male screw.

  In addition, the pressing member is slidably attached to the inner surface of the other end portion in the main body, and a seal member that maintains airtightness between the inner surface of the other end portion in the main body and the outer peripheral surface of the pressing member. By providing, the sealing member can securely hold the airtightness between the pressing member and the main body.

  The fixing means for fixing the lid body to the main body is a member separate from the male screw for fixing the lid body to the shaft body, and is a member for fixing the outer peripheral portion of the lid body to the main body. With the removal of the unit, it is possible to remove the unit in a state where the lid body, the shaft body, and the pressing member are attached to the expansion body without having to remove the male screw.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the chuck apparatus which concerns on embodiment of this invention, (a) is a side view (direction where a cylindrical body is mounted | worn) of an axial direction, (c) Seen from the other side end of the axial direction FIG. It is explanatory drawing of the chuck | zipper apparatus of FIG. 1, Comprising: (a) is a cross-sectional view which follows the AA line of FIG.1 (b), (b) is a longitudinal cross-sectional view which follows an axial direction. It is a longitudinal cross-sectional view of the expansion body of the chuck apparatus of FIG. It is a longitudinal cross-sectional view of the shaft body of the chuck device of FIG. It is a longitudinal cross-sectional view of the cover body of the chuck apparatus of FIG. It is explanatory drawing of the pressing member of the chuck apparatus of FIG. 1, Comprising: (a) is the figure seen from the one side end of the axial direction, (b) is a longitudinal cross-sectional view along an axial direction. (A) Expansion explanatory drawing of the pressing member of a comparative example, (b) is an expansion explanatory drawing of the pressing member of embodiment. It is explanatory drawing of the conventional chuck | zipper apparatus, (a) is a side view, (b) is the figure seen from the direction in which a cylindrical body is mounted | worn. It is a longitudinal cross-sectional view in alignment with the axial direction of the chuck apparatus of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the chuck device according to the embodiment includes an opening 10 a at one end of a substantially cylindrical main body 10, and a lug body 12 that can project from the outer peripheral surface of the main body 10, The expansion body 14 for applying an operating force to the lug body 12 is accommodated in the main body 10, and the opening 10 a is closed by the lid body 16. The chuck device mounts the main body 10 inside a cylindrical body (not shown) to be held, and applies fluid pressure from a pressure source (not shown) into the expansion body 14 to lug from the outer peripheral surface of the main body 10. The body 12 is protruded to hold the cylindrical body from the inside.

  The main body 10 has a base end portion with a large diameter, a tip portion inserted into a cylindrical body to be held has a slightly small diameter, and has a space inside thereof, and the whole has a generally cup shape. A substantially cylindrical expansion body 14 in the front portion of the main body 10 is mounted, and a shaft body 18 is provided in the expansion body 14.

Hereinafter, each part will be described.
[Expandable body 14]
The expansion body 14 is made of a synthetic rubber and can be kept airtight. The state where the chuck device is not mounted is as shown in FIG. 3, which is a substantially cylindrical shape (tube shape) having a uniform thickness, with both end portions folded inward, and circular holes are formed in the folded portion 14b. I'm open. By making the inflatable body 14 structured in this way, it can be formed into a molded product using a mold, and the dimensions can be standardized.

[Shaft body 18]
The shaft body 18 is inserted into the cylinder of the expansion body 14.
As shown in FIG. 4, the shaft body 18 is provided with flange-shaped portions 20 and 20 called “collars” that are radially expanded at both ends in the axial direction, and the flange-shaped portions 20 and 20 at both ends are provided. First concave and convex surface portions 20a and 20a each having an annular convex portion projectingly formed on the outer surface in the axial direction are formed.

  In addition, the space | interval of the flange-like parts 20 and 20 used as the collar of two places is a position which just enters inside the folding | returning part 14b of the expansion body 14 (refer FIG. 2).

  As shown in FIGS. 2 and 4, a ring-shaped protrusion (annular convex portion) is provided on the shaft end side of the flange-shaped portion 20 in order to press the wall of the folded portion 14 b of the expansion body. This protrusion is provided on the outer periphery of the flange-shaped portion 20, and the outer peripheral surface of the flange-shaped portion 20 has a conical taper that tapers in the axial direction. The taper angle is the same as the taper surfaces of the lid body 16 and the pressing member 32 described later.

  Taps (female screw holes) 24, 24 are processed at both ends of the shaft body 18, and the lower hole 26 of the tap 24 on one side (the other side) extends to the center portion of the shaft body 18. Intersects the orthogonal hole 28 leading to the outside.

  Second concave and convex surface portions 22 and 22 are provided on the inner side in the axial direction of the lid 16 and the pressing member 32 so as to oppose the axially outer surfaces of the flange-shaped portions 20 and 20 at both ends.

  The chuck device is in an assembled state, and the expandable body 14 has a shape in which both end portions are folded back toward the center of the shaft body 18, and the folded portions 14 b and 14 b at both end portions of the expandable body 14 are formed as first uneven surface portions. It is sandwiched between 20a, 20a and the second concavo-convex surface portions 22, 22, and the interval is narrowed by means for narrowing the sandwiching interval so that the folded portions 14b, 14b are kept airtight. In addition, in FIG. 7, the part pinched by the inclined surface 30 and the flange-shaped parts 20 and 20 is called the compression part 14c.

[Cover 16 and holding member 32]
On the inner surfaces of both sides in the axial direction of the lid body 16 and the pressing member 32, slopes 30 and 30 that taper from the vicinity of the center in the axial direction toward the second uneven surface portions 22 and 22 are formed in a tapered shape. (Refer to FIG. 5 and FIG. 6) Compression portions 14 c and 14 c are formed on the inclined surfaces 30 and 30, and folded portions 14 b and 14 b at both ends of the expansion body 14 are sandwiched along the second uneven surface portion 22. (See FIG. 7).

  That is, the second concavo-convex surface portions 22, 22 are provided separately from the main body 10 on the inner surface of the lid body 16 that closes the opening 10 a on one side of the main body 10 and on the other inner side in the axial direction of the main body 10. It is formed on the inner surface of a generally bowl-shaped presser member 32 such as a cup shape whose back side is thinner.

  The slopes 30 and 30 are formed as described above, and the folded portions 14b and 14b at both ends of the inflatable body 14 are formed along the second uneven surface portions 22 and 22 from the slopes 30 and 30. Compared with the cylindrical inner surface, the slopes 30 and 30 can compress the compressed portions 14c and 14c at both ends of the expansion body 14 to improve the airtightness. It is possible to reliably fix the outer periphery of the compressed portions 14c, 14c at both ends of the pressing member to prevent the pressing member from being damaged.

  A lid 16 is attached to the main body 10 on the opening 10a side (one side). A “pressing member 32” is attached to the shaft 18 on the side where the pilot hole 26 of the tap 24 extends to the center.

  As shown in FIG. 5, the lid 16 has a conical hole 16 a having an inner peripheral surface of a tapered inclined surface (or a suitable mortar shape) 30. One end of the expansion body 14 is fitted into this portion (see FIG. 2). As shown in FIG. 6, the pressing member 32 has a conical hole 32 a whose inner peripheral surface is a tapered inclined surface (or an appropriate mortar shape) 30. The other end of the expansion body 14 is fitted into this portion (see FIG. 2).

  On the bottoms of the conical holes 16a and 32a of the lid body 16 and the pressing member 32, the diameter of one ring-shaped protrusion of the first uneven surface portions 20a and 20a of the shaft body 18 as the second uneven surface portions 22 and 22 is provided. On the other hand, two strips of a large ring-shaped projection and a small ring-shaped projection are provided so as to project in an annular shape.

  When the shaft body 18 and the expansion body 14 are assembled, the ring-shaped protrusions of the first uneven surface portions 20a, 20a of the flange-shaped portions 20, 20 at both ends of the shaft body 18 are formed into the lid body 16 and the pressing member. It arrange | positions in the middle of the ring-shaped processus | protrusion formed in 2 strip | belt of 32 2nd uneven surface parts 22 and 22. FIG.

[Assembly of the shaft body 18, the expansion body 14, the lid body 16, and the pressing member 32]
The shaft body 18 is inserted into the expansion body 14. And between the first uneven surface portion 20a on the other side of the shaft body 18 and the second uneven surface portion 22 of the pressing member 32, and the first uneven surface portion 20a on one side of the shaft body 18 and the lid The folded portions 14b and 14b of the expansion body 14 are sandwiched between the second uneven surface portion 22 of the body 16 and each.

  The means for narrowing the clamping interval includes taps (female screw holes) 24, 24 formed at one end and the other end of the shaft body 18, and screwed into the taps 24, 24. There are male screws 34 and 34 for fastening the pressing member 32 to the shaft body 18. By tightening the male screws 34, 34 to the taps 24, 24, the clamping interval is narrowed. By tightening the male screws 34, 34 to the taps 24, 24, the clamping interval can be reduced, so that the airtightness of the expansion body 14 can be easily adjusted by tightening the male screws 34, 34. .

[Structure for attaching the holding member 32 to the other side of the shaft 18]
In the embodiment, a hexagon socket head cap screw is used for the male screw 34 that fixes the pressing member 32 to the other side of the shaft body 18. The bolt has a through hole 34a.

  When the male screw 34 is tightened, the other end portion of the shaft body 18 is fitted into the cylindrical hole 32b formed in the bottom of the conical hole 32a of the pressing member 32.

  After the fitting of the shaft body 18 is completed, the folded portion 14b of the expansion body 14 is zigzag by the respective ring-shaped protrusions of the first uneven surface portion 20a and the second uneven surface portion 22 by tightening the male screw 34. The outer peripheral portion of the expansion body 14 is reduced in diameter by entering the conical hole 32 a of the pressing member 32, and is compressed by the inner surface of the pressing member 32 and the outer periphery of the flange-shaped portion 20 of the shaft body 18. The

The folded portion 14 b of the expansion body 14 is sandwiched between one ring-shaped protrusion of the first uneven surface portion 20 a of the flange-shaped portion 20 of the shaft body 18 and two ring-shaped protrusions of the second uneven surface portion 22. The crushing action works. Further, since the outer diameter of the compressed portion 14c is reduced by the inclined surface portion 30, the airtightness is improved by this compression.
Thus, the end of the expansion body 14 is reliably sealed by the compression and crushing action on the compression portion 14c and the folded-back portion 14b of the expansion body 14.

  A groove 32 c for fitting an O (O) ring (seal member) 36 is processed on the outer periphery of the pressing member 32. Since an O-ring 36 that maintains airtightness is provided between the inner surface of the other end of the main body 10 and the outer peripheral surface of the pressing member 32, the O-ring 36 provides a space between the pressing member 32 and the main body 10. The airtightness of

[Structure for attaching the lid 16 to one side of the shaft 18]
A “lid 16” is attached to one side of the shaft 18.
The lid body 16 also has a conical hole 16a having the same shape as the pressing member 32, and a cylindrical hole 16b into which the ring-shaped protrusion second uneven surface portion 22 and the end portion of the shaft body 18 are fitted on the bottom surface of the hole. Has been processed. Further, a counterbore 16c for allowing the screw head of the male screw 34 to enter is formed in front of the mounting hole through which the male screw 34 is inserted into the cylindrical hole 16b on the outer side of the lid body 16, and the head of the male screw 34 is attached when the head is mounted. It doesn't stand out so as not to get in the way of the tubular body.
In the embodiment, a hexagon socket head cap screw is used for the male screw 34 that fixes the lid body 16 to one side of the shaft body 18. The bolt is solid without a through hole.

The sealing method of the expansion body 14 in the lid body 16 is exactly the same as that by the pressing member 32 described above. That is, when the male screw 34 is tightened, one end of the shaft body 18 is fitted into the cylindrical hole 16b formed in the bottom of the conical hole 16a of the lid body 16. By tightening the male screw 34, the ring-shaped protrusion 14b of the expansion body 14 is formed by one ring-shaped protrusion of the first uneven surface portion 20a of the shaft body 18 and two ring-shaped protrusions of the second uneven surface portion 22 of the lid body 16. The crushing action works. Further, since the outer diameter of the compressed portion 14c is reduced by the inclined surface portion 30, the airtightness is improved by this compression.
Thus, the end of the expansion body 14 is reliably sealed by the compression and crushing action on the compression portion 14c and the folded-back portion 14b of the expansion body 14.

  When the fixing of the lid body 16 and the shaft body 18 is completed, a tube unit in which the expansion body 14, the shaft body 18, the pressing member 32, and the lid body 16 are integrated is completed.

  As shown in FIG. 2, the distance between the bottoms of the cylindrical holes 16 b and 32 b in which the lid body 16 and the pressing member 32 fit into one end and the other end of the shaft body 18 is just the length of the shaft body 18. Therefore, the total length of the tube unit is determined by the sum of the machined part dimensions and is constant. Therefore, the tube unit can be incorporated without checking the length to be inserted into the main body 10.

[Incorporation of tube unit into body 10]
In the state where the tube unit is incorporated in the main body 10 as described above, compressed air (an example of fluid) is supplied to the expansion body 14 to operate the lug body 12 with air pressure. A pilot hole (communication hole) 26 is formed in the shaft body 18 from the other end, and the pilot hole 26 is opened toward the inside of the expansion body 14 on the side surface of the central portion of the shaft body 18.

  A male screw 34 screwed into the tap (female screw hole) 24 at the other end has a hollow through hole 34 a communicating with the prepared hole 26.

  The through hole 34 a communicates with an introduction path 38 for introducing air from the outside of the main body 10, and enters the inside of the expansion body 14 through the introduction path 38, the through hole 34 a and the lower hole (communication hole) 26, and the orthogonal hole 28. It is configured to be able to send air.

  Here, as shown in FIGS. 1 and 2, the main body 10 has a hollow, generally cylindrical shape that is open at one end and closed at the other end, and a long hole into which the lug body 12 is fitted has a circumferential shape. Equally arranged on top (in the example, it is divided into four equal parts). A cylindrical hole for housing the tube unit is formed in the central portion in the axial direction, and a cylindrical hole into which the pressing member 32 is fitted is processed on the inner side.

  The other end of the main body 10 is embedded with a plug 40 serving as an air inlet from the cylindrical side surface toward the center of the shaft, and a passage for compressed air (air) is provided in the central portion.

  Note that air can also be injected from the end face of the main body 10 (when air is injected into the pilot hole 26 of the shaft body 18 of the male screw 34 via the shaft portion of the device into which the chuck device is incorporated).

  The lug unit (the lug body 12, the lug plate 12 a, the leaf spring 12 b) is assembled in advance in the long hole portion processed in the main body 10. Note that the lug plate 12 a has a cross-sectional arc shape on the base side of the lug body 12, and transmits the pressure on the outer peripheral surface of the expansion body 14 to the lug body 12. A leaf spring 12b is provided between the lug plate 12a and the inner surface of the main body 10. When the compressed air is supplied to the expansion body 14, it expands and the lug body 12 protrudes against the elastic force of the plate spring 12 b via the lug plate 12 a. Conversely, when the compressed air is released from the expansion body 14, the plate spring 12 b The lug body 12 is retracted into the main body 10 by the elastic force. An elastic body such as hard rubber is attached to the tip of the lug body 12 so that the cylindrical body is not damaged during chucking and can be surely chucked without displacement.

  The tube unit is inserted into the main body 10, and the pressing member 32 is fitted into the cylindrical hole portion in the main body 10.

  The lid 16 and the main body 10 are fixed with the set screw 42, and the assembly is completed.

  Since the set screw 42 is provided separately from the male screw 34, the set screw 42 can be attached / detached to / from the main body 10 as it is by attaching / detaching the set screw 42, and assembly is very easy. That is, since it is not necessary to disassemble the lid body 16 and the shaft body 18 of the tube unit from the expansion body 14, the expansion body 14 is compared with the case where the lid body, the shaft body, or the expansion body are handled separately as in the prior art. It is very easy to attach to and remove from the main body 10, and the working time can be shortened.

[Cylinder clamp]
In a state in which the lug body 12 enters the inside of the main body 10 (a state of the lower half surface of the cross-sectional structure diagram of FIG.

  The outer peripheral portion of the end (the other side end) of the portion into which the cylindrical body is inserted has a conical shape, and the cylindrical body inserted up to this portion is aligned.

  When compressed air is injected from the plug 40, the expanded body 14 is filled with compressed air via the male screw (holed bolt) 34 with the through hole 34a and the lower hole 26 of the shaft body 18, and the lug unit is attached to the outside of the main body 10. Stick out. The lug strongly presses and clamps the inner surface of the cylindrical body.

From the above, the component parts of the chuck device of the embodiment are as the number of component parts excluding the lug unit,
1) Expansion body 14: 1 piece 2) Shaft body 18: 1 piece 3) Hexagon socket head cap screw 36 with / without through hole 2) 4) Tube holding member 32: 1 piece 5) O-ring 36: 1 piece 6 ) The cover body 16: 1 or more is the tube unit 7) the main body 10: 1 or more 7 types and 8 points.

Specific differences between the chuck device described in the embodiment of the present invention (the device of the present invention) and the prior art of the chuck device illustrated in FIGS. 7 and 8 will be described.
1) The length of the tube unit is shortened In the case of the device of the present invention, the total length of the tube unit is “lag length + 57 mm”.
In the case of the shaft (main body) of the prior art, the total length of the tube unit was “lag length + 87.5 mm”.
In the case of a standard lug length of 80 mm, the prior art shaft required an extra dimension (109% of the lug length) slightly exceeding the lug length (the axial length of the lug body). Could be shortened below the axial length of the lug body 12 (71% of the lug body length). As a result, the length of the main body 10 was shortened by 30.5 mm.

  As a result, the stroke when removing and attaching the core was (80 + 87.5) × 2 = 335 mm with the standard lug, but with the device of the present invention, it was shortened to (80 + 57) × 2 = 274 mm, 61 mm. It becomes possible and contributes to the downsizing of the equipment width.

2) Reliable sealing of the compressed air in the expansion body Rather than tying the end of the expansion body empirically using SUS steel wire, the expansion body has a ring-shaped projection and a conical surface with guaranteed mechanical dimensions. The method of compressing is reliable and reliable.

  In the case of a SUS steel wire, a protective tape is necessary because it may be entrapped in the expanded body when it is tied up and may cause cracks. On the other hand, in the apparatus of the present invention, since the expansion body is compressed based on the machining dimension of the part, there is no trouble due to excessive compression.

3) Efficient assembly work In the prior art, when assembling the tube unit, manual work such as insertion of a tube nipple, winding of a protective tape, winding and binding of a SUS steel wire was required.

  On the other hand, in the apparatus of the present invention, in addition to the operation of inserting the shaft into the expansion body, the tube unit can be assembled with the hexagon socket bolt using a tool (Arlenki), so the workability is remarkably high. improves. In particular, since the compressive force of the expandable body can be managed by the tightening force of the bolts, it is not necessary to adjust the tightening degree by experience with the SUS steel wire.

4) Reduction in the number of parts The number of parts, excluding the lug unit, which is a common configuration, is reduced by 50%, with 16 points for the prior art and 8 points for the device of the present invention.

  Therefore, in the apparatus of the present invention, the assembly work of the chuck can be simplified and improved in efficiency.

5) One-touch attachment / detachment of the tube unit from the main body In the conventional technology, when the lid is removed from the main body, the knob at the tip of the tube unit is visible. In addition, since the knob is the head of a hexagon socket head bolt, there is a drawback that it is small and difficult to grasp, but the disadvantage can be solved by using an appropriate clip.

  In the device of the present invention, the lid is integrated with the tube unit. For this reason, the whole tube unit can be taken out by removing the lid. The lid has a large outer diameter and is easy to work.

From the above, the device of the present invention has the following advantages.
1) Since the overall length of the chuck is shortened, the desorption stroke of the cylindrical body is shortened, and the apparatus width can be made compact.
2) Since the expansion body is compressed by a combination of machined parts having accurate dimensions, a sealed state of a constant quality is obtained regardless of who is assembled (stable seal quality).
3) The workability is improved because the tube unit is assembled using a tool.
4) The chuck assembly work can be simplified by reducing the number of parts.
5) Since the tube unit is made up to the lid, it can be detached with one touch.

  The above-described embodiment is an embodiment of the present invention, and can be modified within the scope of the technical idea of the present invention.

  The chuck device of the present invention can be appropriately used for unwinding and winding work by inserting various cylindrical bodies, for example, paper and sheet bodies, into the core of the winding roll and inserting the chuck device.

DESCRIPTION OF SYMBOLS 10 Main body 10a Opening 12 Lug body 12a Lug board 12b Leaf spring 14 Expansion body 14a Cylindrical part (comparative example)
14b Folded portion (example of the present invention)
14c Compression part (example of the present invention)
16 Lid 16a Hole 16b Cylindrical hole 18 Shaft body 20 Flange-shaped portion 20a First uneven surface portion 22 Second uneven surface portion 24 Tap (Female screw hole)
26 Pilot hole (communication hole)
28 Orthogonal hole 30 Slope 32 Holding member 32a Conical hole 32b of holding member Cylindrical hole 32c Groove 34 for o-ring Male thread 34a Through hole 36 O-ring 38 Inlet path 40 Plug

Claims (7)

An opening is provided at one side end of the substantially cylindrical main body, and a lug body that can project from the outer peripheral surface of the main body and an expansion body for applying an operating force to the lug body are accommodated in the main body, and the opening Is closed with a lid, and the main body is mounted inside a cylindrical body to be held, and fluid pressure is applied to the inflated body so that the lug body protrudes from the outer peripheral surface of the main body. In the chuck device that holds the body from the inside,
Provide a pressing member for hitting the end of the expansion body inside the other side of the main body,
A shaft is provided in the substantially cylindrical expansion body in the main body,
A flange-like portion is provided at both axial ends of the shaft body, and first concave and convex surface portions are respectively formed on the axially outer surfaces of the flange-like portions at both ends,
A second uneven surface portion is provided on the inner side in the axial direction of the lid body and the pressing member so as to oppose the outer surface in the axial direction of the flange-like portion at both ends, and the expansion body is folded back in the center direction of the shaft body. The folded portion at both ends of the inflatable body is sandwiched between the first uneven surface portion and the second uneven surface portion, and the interval is narrowed by means for narrowing the sandwiching interval so that the folded portion is kept airtight. A chuck device characterized by that.   On the inner surfaces of both sides in the axial direction of the lid and the pressing member, a slope that tapers from a portion near the center in the axial direction toward the second concavo-convex surface is formed along the second concavo-convex surface portion. The chuck device according to claim 1, wherein folding of both end portions of the expansion body is formed.   The second concavo-convex surface portion includes an inner side surface of a lid that closes an opening on one side of the main body, and an inner side surface of a generally bowl-shaped pressing member provided separately from the main body inside the other side in the axial direction of the main body. The chuck device according to claim 1, wherein the chuck device is formed respectively.   The means for narrowing the clamping interval includes a female screw hole formed in one side end and the other side end of the shaft body, and screwing into the female screw hole to fix the lid body and the pressing member to the shaft body. The chuck device according to claim 3, wherein the chucking interval can be narrowed by tightening the male screw into the female screw hole.   A male screw having a communication hole formed in the shaft body from the other end, the communication hole opening toward the inside of the expansion body at the side surface of the central portion of the shaft body, and screwed into the female screw hole in the other end portion However, the hollow structure communicates with the communication hole, the hollow structure communicates with an introduction path for introducing fluid from the outside of the main body, and the fluid is introduced into the expansion body via the introduction path, the hollow structure, and the communication hole. The chuck device according to claim 4, wherein the chuck device is configured to be fed.   The pressing member is slidably attached to the inner surface of the other end portion in the main body, and a seal member is provided to maintain airtightness between the inner surface of the other end portion in the main body and the outer peripheral surface of the pressing member. 6. The chuck device according to claim 3, wherein the chuck device is formed.   The fixing means for fixing the lid body to the main body is a member that is separate from the male screw that fixes the lid body to the shaft body, and is a member that fixes an outer peripheral portion of the lid body to the main body. The chuck device according to 5 or 6.

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