JP4585334B2 - Finger chuck attachment / detachment device - Google Patents

Description

  The present invention relates to a finger chuck attaching / detaching device in a bar feeder.

  The bar feeder is provided with a feed rod for feeding the bar to a bar processing machine such as a lathe. A shaft portion at the rear end of the finger chuck is rotatably inserted and connected to the tube portion at the front end of the feed rod, and the rear end portion of the bar is gripped by the chuck portion at the front end of the finger chuck (for example, Patent Documents). 1, 2, 3).

  Since the finger chuck needs to be replaced according to the diameter of the bar to be fed into a lathe or the like, the finger chuck is detachably connected to the feed rod via an attachment / detachment device.

  In this attachment / detachment device, (1) the chuck portion of the finger chuck is fixed to the shaft portion with a set screw (for example, refer to Patent Document 1), (2) the finger chuck shaft portion is attached to the tip of the feed rod. Inserted into a fixed cylinder part so as to be rotatable, and a finger chuck is attached to and detached from a feed rod by an attaching / detaching device provided between the cylinder part and the shaft part (for example, see Patent Document 2), (3) Unlike the above (1) and (2), the shaft portion is protruded from the front end of the rotating body, this shaft portion is inserted into the tube portion protruding from the rear end of the finger chuck, and the tube portion and the shaft portion are arranged in the diameter direction thereof. There is one in which a finger chuck is fixed to a feed rod by passing a pin through a through-hole (for example, see Patent Document 3).

JP-A-9-70701 Japanese Utility Model Publication No. 7-27042 JP 11-285901 A

  The conventional finger chuck attaching / detaching device has the problem that the above (1) requires a troublesome operation of tightening or loosening a set screw using a tool for attaching / detaching the finger chuck.

  Further, in the above (2), an annular recess is formed on the outer peripheral surface of the shaft portion, and a through hole that faces the recess when the shaft portion is inserted is formed in the cylindrical portion. A spherical body is inserted into the cylinder portion so as to be movable in the radial direction of the cylinder portion, and an operation cylinder is slidably and slidable in the circumferential direction and the axial direction, and the spherical body is pressed into the recess inside the operation cylinder. An inner peripheral surface and a relief hole for releasing the sphere out of the recess are provided, and when the operation cylinder is slid in the circumferential direction, the state in which the sphere is released by the escape hole is changed to a state in which the sphere is pressed on the inner peripheral surface. It has become. However, the escape hole and the sphere cannot be visually recognized from the outside of the operation cylinder, for example, when the operation cylinder is rotated in the circumferential direction to release the pressure and then the original position is not known when the operation cylinder is returned to the original position. The operation when pressing again is troublesome. Also, since the shaft of the finger chuck is held in the cylindrical portion of the feed rod via a bearing, the finger chuck becomes longer and bulky, making it difficult to attach to and detach from the feed rod, and the sphere of the attachment / detachment device rotates. There is a problem that the spherical body, the shaft portion, and the like are easily worn because of contact with the shaft portion.

  In the above (3), a tool for removing and inserting the pin is required when the finger chuck is attached and detached, and when removing the finger chuck from the rotating body, the pin is removed from the finger chuck or the like. There is a problem that pins are easily lost because they are completely extracted.

  An object of this invention is to provide the attachment or detachment apparatus of the finger chuck which can solve such a problem.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the shaft (5a) at the rear end of the finger chuck (5) is removably inserted into the cylindrical portion (4a) at the tip of the feed rod (3). A recess (5b) is formed on the outer peripheral surface of the shaft portion (5a), and a through hole (4b) that faces the recess (5b) when the shaft portion (5a) is inserted into the cylindrical portion (4a). The spherical body (8) is inserted into the through hole (4b) so as to be movable in the radial direction of the cylindrical portion (4a), and the operating cylinder (9) is circumferentially and axially inserted into the cylindrical portion (4a). An inner peripheral surface (9b) for pressing the sphere (8) into the recess (5b) and the sphere (8) to the outside of the recess (5b) are slidably covered. A relief hole (9a) for escaping is provided, and a protrusion for holding the operating cylinder (9) in a state where the spherical body (8) is pressed into the recess (5b) by the inner peripheral surface (9b). (10a) and an engaging groove (13b) are provided in the cylindrical portion (4a) and the operating cylinder (9), respectively, and when the operating cylinder (9) is slid in the circumferential direction, a spherical body (8) is formed by a relief hole (9a). From the released state to the state in which the sphere (8) is pressed by the inner peripheral surface (9b), and then the operating cylinder (9) is slid in the axial direction so that the protrusion (10a) is formed in the engaging groove (13b). In the finger chuck attaching / detaching device, the operation cylinder (9) is held in a state in which the spherical body (8) is pressed into the recess (5b) by the inner peripheral surface (9b) when engaged. A groove (13b) is formed as a closed groove extending in the axial direction on the operating cylinder (9) and ending at both ends with closed ends (16, 17), and is operated from one closed end (17) of the engagement groove (13b). A guide groove (13a) extending in the circumferential direction of the cylinder (9) and ending at the terminal end (18) is formed in the operation cylinder (9). ) Is slid in the circumferential direction, and the projection (10a) is slid from the terminal end (18) to the closed end (17) of the engagement groove (13b) in the guide groove (13a), the operation cylinder (9) is moved. Transition from a state in which the sphere (8) is released by the escape hole (9a) to a state in which the sphere (8) is pressed by the inner peripheral surface (9b), and then the operation cylinder (9) is slid in the axial direction to project. When (10a) is slid from the closed end (17) to the opposite closed end (16) in the engagement groove (13b), the operation cylinder (9) is sphere (8) on its inner peripheral surface (9b). A finger chuck attaching and detaching device is adopted in which it is held in a state where it is pressed into the recess (5b).

  Further, the invention according to claim 2 is the finger chuck attaching / detaching device according to claim 1, wherein the tube portion (4a) is rotatably held at the tip of the feed rod (3). adopt.

  According to a third aspect of the present invention, in the finger chuck attaching / detaching device according to the first or second aspect, the operation cylinder (9) has the inner peripheral surface (9b) and the spherical body (8) is recessed (5b). A finger chuck attaching / detaching device that constantly urges the operating cylinder (9) by the elastic body (15) is employed so as to hold the state pressed inward.

  According to a fourth aspect of the present invention, in the finger chuck attaching / detaching device according to any one of the first to third aspects, the outer diameter of the operating cylinder (9) is larger than the outer diameter of the finger chuck (5). A finger chuck attaching / detaching device formed to be small is employed.

  Further, the invention according to claim 5 is the finger chuck attaching / detaching device according to any one of claims 1 to 4, and is freely detachable when the shaft portion (5 a) is inserted into the cylindrical portion (4 a). The clutches (10, 11) to be fitted to the head employ a finger chuck attaching / detaching device provided between the shaft portion (5a) and the cylindrical portion (4a).

  According to the first aspect of the present invention, the shaft portion (5a) at the rear end of the finger chuck (5) is removably inserted into the cylindrical portion (4a) at the tip of the feed rod (3), and the shaft portion ( A recess (5b) is formed on the outer peripheral surface of 5a), and a through-hole (4b) facing the recess (5b) is formed in the cylindrical portion (4a) when the shaft portion (5a) is inserted. The spherical body (8) is inserted into the hole (4b) so as to be movable in the radial direction of the cylindrical portion (4a), and the operating cylinder (9) is slidable in the circumferential direction and the axial direction in the cylindrical portion (4a). An inner peripheral surface (9b) that presses the sphere (8) into the recess (5b) and an escape hole (9a) that allows the sphere (8) to escape to the outside of the recess (5b) are placed inside the operation cylinder (9). ) And is engaged with a protrusion (10a) that holds the operating cylinder (9) in a state where the spherical body (8) is pressed into the recess (5b) on the inner peripheral surface (9b). (13b) are provided in the cylinder part (4a) and the operation cylinder (9), respectively, and when the operation cylinder (9) is slid in the circumferential direction, the sphere (8) is released from the state of releasing the spherical body (8) by the relief hole (9a). When the sphere (8) is pressed by the surface (9b), the operation cylinder (9) is then slid in the axial direction and the projection (10a) is engaged with the engagement groove (13b). 9) In the finger chuck attaching / detaching device in which the inner peripheral surface (9b) holds the spherical body (8) into the recessed portion (5b), the engaging groove (13b) has an operating cylinder. (9) It is formed as a closed groove that extends in the axial direction and ends at both ends at the closed ends (16, 17). From one closed end (17) of the engagement groove (13b) to the circumferential direction of the operation cylinder (9) A guide groove (13a) that extends in the direction and ends at the end (18) is formed in the operation cylinder (9), and slides in the circumferential direction on the operation cylinder (9). When the projection (10a) is slid from the terminal end (18) to the closed end (17) of the engaging groove (13b) in the guide groove (13a), the operation cylinder (9) is sphered by the escape hole (9a). From the state in which (8) is released, the state shifts to the state in which the sphere (8) is pressed on the inner peripheral surface (9b), and then the operating cylinder (9) is slid in the axial direction, and the protrusion (10a) is engaged with the engagement groove When sliding from the closed end (17) to the opposite closed end (16) in (13b), the operation tube (9) moves the spherical body (8) into the recess (5b) by its inner peripheral surface (9b). Since the finger chuck attaching / detaching device is held in a pressed state, the operator slides the projection (10a) in the guide groove (13a) to the terminal end (18) or the closed end (17). Just turn the control tube (9) until it touches, and the finger chuck (5) will move against the feed rod (3). Fixing and releasing can be switched easily and quickly. Further, since both ends of the engagement groove (13b) are closed by the closed ends (16, 17), the operation cylinder (9) is prevented from falling off from the cylinder portion (4a), and the sphere (8) is thereby removed. Is prevented. Moreover, since the spherical body (8) can be pressed or released by sliding the operating cylinder (9) on the cylindrical part (4a), the finger chuck (5) can be easily replaced without using any tools. Can be done.

  According to a second aspect of the present invention, in the finger chuck attaching / detaching device according to the first aspect, the tube portion (4a) is a finger chuck attaching / detaching device held rotatably at the tip of the feed rod (3). Therefore, the cylindrical portion (4a) can rotate with respect to the feed rod (3) together with the finger chuck (5). Accordingly, the operation cylinder (9), the sphere (8), the recess (5b) and the like also rotate integrally with the rotator (4) and the finger chuck (5), so that the sphere (8), the recess (5b), etc. Wear is prevented.

  According to a third aspect of the present invention, in the finger chuck attaching / detaching device according to the first or second aspect, the operating cylinder (9) has the inner peripheral surface (9b) thereof and the spherical body (8) is recessed (5b). Since it is a finger chuck attaching / detaching device that constantly urges the operating cylinder (9) by the elastic body (15) so as to keep the state pressed into the inside, the operating cylinder (9) presses the spherical body (8). It can be fixed so that it does not move in the direction of release. Further, when the operation cylinder (9) is turned from the release position of the pressing force to the spherical body (8) to the pressing position, the protrusion (10a) automatically enters the engaging groove (13b) by the urging force of the elastic body (15). Therefore, pressing on the sphere (8) can be completed by a one-touch operation.

  According to the invention which concerns on Claim 4, in the attachment or detachment apparatus of the finger chuck in any one of Claim 1 thru | or 3, the outer diameter of the operation cylinder (9) is larger than the outer diameter of a finger chuck (5). Since the finger chuck attaching / detaching device is formed to be small, when the finger chuck (5) enters the spindle (2a) of the lathe (2), the operation cylinder (9) is placed on the inner surface of the spindle (2a). It can be prevented from touching.

  According to the fifth aspect of the present invention, in the finger chuck attaching / detaching device according to any one of the first to fourth aspects, the shaft part (5a) can be freely engaged and disengaged when the shaft part (5a) is inserted into the cylindrical part (4a). Since the clutches (10, 11) to be fitted to the ring are finger chuck attaching / detaching devices provided between the shaft portion (5a) and the tube portion (4a), the shaft portion (5a) is replaced with the tube portion (4a). Simultaneously with the insertion, the finger chuck (5) is connected to the cylindrical portion (4a) so as to be integrally rotatable.

  The best mode for carrying out the invention will be described below with reference to the drawings.

  As shown in FIG. 1, the bar feeder 1 is installed horizontally on the floor, and an NC lathe 2 which is a bar processing machine is installed adjacent to the bar feeder 1.

  A feed rod 3 is disposed horizontally on the frame 1 a of the bar feeder 1. The feed rod 3 can be moved on an extension line of the main shaft 2a of the NC lathe 2 by a known driving device (not shown).

  A rotating body 4 is connected to the tip of the feed rod 3, a finger chuck 5 is connected to the tip of the rotating body 4, and the rear end of the bar A is gripped by the chuck portion of the finger chuck 5.

  As shown in FIGS. 2 and 3, the rotating body 4 is specifically a spindle and is rotatably held in the cavities of the sleeves 3 a and 3 b fixed to the tip of the feed rod 3. 2B and 3B, reference numerals 6 and 7 denote a radial bearing and a thrust bearing that rotatably support the rotating body 4, respectively. The sleeves 3 a and 3 b are formed by a base sleeve 3 a fixed to the front end of the feed rod 3 and a bearing sleeve 3 b screwed to the base sleeve 3 a, and the various bearings 6 are interposed between the bearing sleeve 3 b and the rotating body 4. , 7 are interposed.

  The finger chuck 5 is detachably connected to the rotating body 4 by an attaching / detaching device shown in FIGS.

  In this finger chuck 5 attachment / detachment device, a shaft portion 5a protruding from the rear end of the finger chuck 5 is removably inserted into a cylindrical portion 4a formed at the tip of the rotating body 4, and the outer peripheral surface of the shaft portion 5a is inserted. The cylindrical portion 4a is formed with a through hole 4b that faces the concave portion 5b when the shaft portion 5a is inserted, and the sphere 8 moves in the radial direction of the cylindrical portion 4a in the through hole 4b. The operation tube 9 is slidably inserted in the cylinder portion 4a so as to be slidable in the circumferential direction and the axial direction. The operation tube 9 has an inner peripheral surface 9b and a sphere that press the sphere 8 into the recess 5b. 8 is provided with an escape hole 9a for allowing the outer cylinder 8 to escape to the outside of the recess 5b, and the projection 10a and the engagement groove 13b for holding the operating cylinder 9 in a state where the spherical body 8 is pressed into the recess 5b by the inner peripheral surface 9b. And the operation cylinder 9 are respectively provided, and the operation cylinder 9 is slid in the circumferential direction. From the state in which the sphere 8 is released by the escape hole 9a, the state shifts to the state in which the sphere 8 is pressed by the inner peripheral surface 9b, and then the operation cylinder 9 is slid in the axial direction so that the engagement groove 13b is formed on the cylinder portion 4a. When engaged with the projection 10a, the operation cylinder 9 is held in a state in which the spherical body 8 is pressed into the recess 5b by the inner peripheral surface 9b.

  The tip of the spindle which is the rotating body 4 protrudes forward from the bearing sleeve 3b, and this protruding portion is formed as a cylindrical portion 4a. From the rear end of the finger chuck 5, a shaft portion 5a that can be removably inserted into the cavity of the cylindrical portion 4a protrudes rearward.

  A concave portion 5b is formed on the outer peripheral surface of the shaft portion 5a. The recess 5b may be formed by forming recesses into which a part of the sphere 8 can enter at a plurality of positions on the outer peripheral surface of the shaft portion 5a at a predetermined angle interval. In this embodiment, the recess 5b is formed as an annular groove. . As shown in FIG. 5B, the recess 5b, which is an annular groove, is formed to such a depth that it is almost completely buried in the through hole 4b when the sphere 8 is fitted.

  In this embodiment, since the recess 5b is an annular groove, a clutch is provided to securely fix the finger chuck 5 to the rotating body 4 in the rotational direction. That is, as shown in FIGS. 4 and 5, the rotation prevention pin 10 protruding into the cavity is screwed to the cylindrical portion 4 a of the rotating body 4, and the shaft portion 5 a is cylindrically connected to the shaft portion 5 a of the finger chuck 5. A concave groove 11 into which the detent pin 10 fits when inserted into the portion 4a is formed. When the locking pin 10 is detachably fitted in the groove 11, the finger chuck 5 can rotate integrally with the rotating body 4, and when the locking pin 10 comes out of the groove 11, the finger chuck 5 can rotate relatively. It becomes. A spline may be employed in place of the rotation prevention pin 10 and the concave groove 11.

  As shown in FIGS. 4A, 4B, 5B, and 6B, the through-holes 4b are radially formed in the cylindrical portion 4a of the rotating body 4 at a plurality of locations. Specifically, it is formed at four locations, but may be one or more locations. In each through-hole 4b, a steel ball as a sphere 8 is fitted so as to be movable in the radial direction of the cylindrical portion 4a. A convex portion 12 for preventing the spherical body 8 from dropping into the cavity of the cylinder portion 4a is formed at a location where the through hole 4b faces the cavity of the cylinder portion 4a. As shown in FIG. 4A, the through hole 4b and the sphere 8 are provided so as to face the concave portion 5b of the shaft portion 5a when the shaft portion 5a is fully inserted into the cylindrical portion 4a.

  As shown in FIGS. 4A, 4B, 5B, and 6B, the operation cylinder 9 is a cylindrical ring and covers the sphere 8 from above the cylinder portion 4a. For this reason, the sphere 8 is prevented from detaching radially outward from the through hole 4b of the cylindrical portion 4a. On the inner peripheral surface 9b of the operation cylinder 9, an escape hole 9a for allowing the sphere 8 to escape to the outside of the recess 5b is formed so as to correspond to the through hole 4b along the circumferential direction.

  The operation cylinder 9 is slidably covered on the cylinder portion 4a in the circumferential direction and the axial direction, and the spherical body 8 is pressed radially inward as shown in FIG. The pressure is released so as to move outward in the radial direction. In FIG. 5 (B), the operation cylinder 9 is slid in the counterclockwise direction with respect to the cylinder portion 4a to press the sphere 8 inward in the radial direction of the cylinder portion 4a. In FIG. 4a is released from the state of FIG. 5B in the clockwise direction to release the pressure of the sphere 8 and release the sphere 8 so as to be movable radially outward. As described above, when the operation cylinder 9 is slid in the circumferential direction, the sphere 8 is pressed and fitted into the recess 5b to restrain the shaft portion 5a of the finger chuck 5 in the cylinder portion of the rotating body 4, and the operation cylinder 9 Is slid in the opposite direction, the sphere 8 is released from the pressure and can be detached from the recess 5b, and the shaft portion 5a of the finger chuck 5 can be pulled out of the cylindrical portion 4a of the rotating body 4.

  The operation cylinder 9 is guided and regulated to slide in the circumferential direction and the axial direction on the cylinder portion 4a by the guide means. As shown in FIGS. 2 (A), 3 (A), 4 (A) (B), 5 (A) and 6 (A), the guide means is an engagement formed on the operation cylinder 9. It comprises a groove 13b, a guide groove 13a, and a protrusion 10a that is slidably fitted into these grooves.

  The engagement groove 13 b is formed as a closed groove that extends in the axial direction on the operation cylinder 9 and ends at the closed ends 16 and 17. The guide groove 13a extends from one closed end 17 of the engagement groove 13b in the circumferential direction of the operation cylinder 9 and ends at the end 18. The engaging groove 13b and the guide groove 13a communicate with each other and are formed in a substantially L shape as a whole.

  The protrusion 10a is provided on the outer peripheral surface of the cylindrical portion 4a. Specifically, the protrusion 10 a is replaced by the head of the detent pin 10. This protrusion fits into the engaging groove 13b and the guide groove 13a, and regulates the sliding direction and sliding amount of the operation tube 9 in the circumferential direction and the axial direction.

  According to the guide means configured as described above, the operation cylinder 9 is retracted toward the feed rod 3 by a certain distance as shown in FIGS. 3A, 4B, and 6A, and the protrusion 10a is formed in the guide groove 13a. When the operating cylinder 9 stops at the point where it abuts on the terminal end 18, the escape hole 9a on the inner periphery of the operating cylinder 9 matches the position of the spherical body 8 and the through hole 4b as shown in FIG. Release the pressure on 9. As a result, the sphere 8 can move outward in the radial direction of the cylindrical portion 4a, can be detached from the recess 5b of the shaft portion 5a, and the shaft portion 5a of the finger chuck 5 can be detached from the cylindrical portion 4a of the rotating body 4. become. After inserting the shaft portion 5a of the finger chuck 5 into the cylindrical portion 4a of the rotating body 4, the operating cylinder 9 is slid in the circumferential direction, and the projection 10a is closed in the guide groove 13a from its terminal end 18 to the engagement groove 13b. When slid to 17, the operation cylinder 9 shifts from a state in which the sphere 8 is released by the escape hole 9a to a state in which the sphere 8 is pressed by the inner peripheral surface 9b. The spherical body 8 moves inward in the through hole 4 b in the radial direction, fits into the recess 5 b, and restrains the shaft portion 5 a of the finger chuck 5 within the cylindrical portion 4 a of the rotating body 4. Subsequently, when the operating cylinder 9 is slid in the axial direction and the protrusion 10a is slid from the closed end 17 to the opposite closed end 16 in the engagement groove 13b, FIGS. 2 (A) and 4 (A). And as FIG. 5 (A) shows, the protrusion 10a fits into the engaging groove 13b. As a result, the state in which the operating cylinder 9 presses the sphere 8 into the recess 5b by the inner peripheral surface 9b is maintained.

  As shown in FIGS. 2A and 2B, the operation cylinder 9 is preferably formed so that the outer diameter thereof is smaller than the outer diameter of the finger chuck 5. Thereby, when the finger chuck 5 enters the main shaft 2a of the NC lathe 2, contact between the operation cylinder 9 and the inner surface of the main shaft 2a is prevented.

  4A and 4B, an annular gap 14 is formed between the operation cylinder 9 and the cylinder portion 4a of the rotating body 4, and an elastic body 15 that is a compression coil spring is formed in the gap 14. Inserted. The operation cylinder 9 is pressed by the elastic body 15 as shown in FIGS. 2 (A) and 4 (A) so that the sphere 8 is fitted into the recess 5b, and the shaft portion 5a of the finger chuck 5 is moved into the cylinder portion 4a of the rotating body 4. It is always urged in the direction of restraining. Further, by sliding the operation tube 9 against the urging force of the elastic body 14 in the direction opposite to this direction, the restriction of the shaft portion 5a of the finger chuck 5 can be released as described above.

  Next, the operation of the finger chuck attaching / detaching device will be described.

  (1) In the state where the projection 10a enters the engaging groove 13b as shown in FIGS. 2 (A), 4 (A) and 5 (A), the inner peripheral surface of the operation cylinder 9 as shown in FIG. 5 (B). 9b presses the sphere 8 inward in the radial direction, and the sphere 8 fits into the recess 5b. Accordingly, the shaft portion 5a of the finger chuck 5 is restrained so as not to come out of the cylindrical portion 4a of the rotating body 4.

  Further, as shown in FIGS. 4A and 5A, the detent pin 10 protruding from the cylindrical portion 4 a of the rotating body 4 into the cavity thereof is provided with the concave groove 11 of the shaft portion 5 a of the finger chuck 5. Thus, the finger chuck 5 can be rotated integrally with the rotating body 4.

  (2) As shown in FIG. 1, when the finger chuck 5 grips the rear end of the bar A in the bar feeder 1 and the feed rod 3 advances toward the main shaft 2 a of the NC lathe 2, the bar A is gripped by a chuck (not shown) of the main shaft 2a and cut by a cutter (not shown). At this time, the bar A rotates with the main shaft 2a, and the finger chuck 5 rotates at the tip of the feed rod 3 together with the rotating body 4 while holding the bar A. The feed rod 3 supports the rotating rod A, the finger chuck 5 and the rotating body 4 so as not to swing around.

  (3) When replacing the finger chuck 5 by changing the diameter of the bar A, etc., set the operating cylinder 9 at the position shown in FIGS. 3 (A), 4 (B), 6 (A) and 6 (B). Then, the pressing of the sphere 8 by the operation cylinder 9 is released.

  That is, the operating cylinder 9 is pressed toward the feed rod 3 so as to resist the urging force of the elastic body 15. The operating cylinder 9 is retracted in the axial direction from the state of FIGS. 2A, 4A, and 5A to the feed rod 3 side by the guide of the protrusion 10a and the engaging groove 13b. The operation cylinder 9 moves from a position where the projection 10a contacts one closed end 16 of the engagement groove 13b to a position where it contacts the other closed end 17. When the projection 10a comes into contact with the other closed end 17 of the engagement groove 13b and the operation tube 9 stops, the operation tube 9 is slid in the circumferential direction. The operation cylinder 9 slides in the guide groove 13a from the position where the projection 10a contacts the other closed end 17 of the engagement groove 13b, and terminates as shown in FIGS. 3 (A), 4 (B) and 6 (A). Slide until it contacts 18. When the operation cylinder 9 is rotated by a certain angle and stopped, the escape hole 9a on the inner peripheral surface of the operation cylinder 9 matches the position of the sphere 8 and the through hole 4b as shown in FIG. The pressure is released and the cylinder 4a can move outward in the radial direction.

  The operation cylinder 9 is self-held at this position when the projection 10a is pressed against the edge of the guide groove 13a by the urging force of the elastic body 15.

  (4) As shown in FIG. 6 (B), when the escape hole 9a on the inner peripheral surface of the operation cylinder 9 matches the position of the sphere 8 and the through hole 4b, the finger chuck 5 as shown in FIG. 4 (B). Is extracted from the rotating body 4. At that time, the sphere 8 is pushed into the through-hole 4b by the peripheral surface of the shaft portion 5a and immersed therein, and the shaft portion 5a is smoothly withdrawn from the cylindrical portion 4a.

  (5) A new finger chuck 5 is prepared, and as shown in FIGS. 3B and 4B, the shaft portion 5a of the finger chuck 5 is directly opposed to the cavity of the cylindrical portion 4a of the rotating body 4, and the finger chuck The shaft portion 5 a of 5 is inserted into the cavity of the rotating body 4.

  When the shaft portion 5a completely enters the cylindrical portion 4a, as shown in FIG. 4A, the detent pin 10 fits into the concave groove 11 of the shaft portion 5a of the finger chuck 5, and the finger chuck 5 And can be rotated together.

  (6) When the operating cylinder 9 is slid in the circumferential direction by the guide of the protrusion 10a and the guide groove 13a from the state of FIGS. 3 (A), 6 (A) and 6 (B), the protrusion 10a moves in the guide groove 13a. The operating cylinder 9 stops when it slides from the terminal end 18 to the closed end 17 of the engaging groove 13 b and the projection 10 a hits the closed end 17. As a result, as shown in FIG. 5B, the inner peripheral surface 9b of the operation cylinder 9 presses the sphere 8 inside the through hole 4b inward of the shaft portion 5a in the radial direction, and the sphere 8 fits into the recess 5b. The shaft portion 5 a of the finger chuck 5 is constrained within the cylindrical portion 4 a of the rotating body 4.

  (7) When the operating cylinder 9 is released, the operating cylinder 9 advances to the finger chuck 5 side by the urging force of the elastic body 15 as shown in FIG. At that time, the protrusion 10a slides relatively in the engagement groove 13b to guide the operation tube 9 to advance. When the projection 10a hits the end of the engagement groove 13b, the operation cylinder 9 stops. The operation cylinder 9 is held at this position by the urging force of the elastic body 15.

  The operations (6) and (7) are performed only by the operator performing an operation of rotating the operation cylinder 9 by a predetermined angle on the cylinder portion 4a. Therefore, the finger chuck 5 is a so-called one-touch operation without using any tool. Is connected to the feed rod 3.

It is a front view of the bar feeder provided with the attachment / detachment device of the finger chuck concerning the present invention. (A) is a top view shown in the state where the finger chuck was attached to the feed rod, (B) is a partially cutaway front view. (A) is a top view which shows the state which removed the finger chuck from the feed rod, (B) is a partially notched front view. 2A is an enlarged view of the main part in FIG. 2B, and FIG. 3B is an enlarged view of the main part in FIG. 4A is a cross-sectional view taken along the line Va-Va in FIG. 4A, and FIG. 4B is a cross-sectional view taken along the line Vb-Vb in FIG. 4A is a cross-sectional view taken along line VIa-VIa in FIG. 4B, and FIG. 4B is a cross-sectional view taken along line VIb-VIb in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Feed rod 4a ... Cylindrical part 4b ... Through-hole 5 ... Finger chuck 5a ... Shaft part 5b ... Recessed part 8 ... Sphere 9 ... Operation cylinder 9a ... Escape hole 9b ... Inner peripheral surface 10 ... Anti-rotation pin 10a ... Protrusion 11 ... Concave Groove 13a ... guide groove 13b ... engagement groove 15 ... elastic body 16, 17 ... closed end 18 ... terminal

Claims (5)

  The shaft portion at the rear end of the finger chuck is removably inserted into the tube portion at the tip of the feed rod, a recess is formed on the outer peripheral surface of the shaft portion, and the recess is formed when the shaft portion is inserted into the tube portion. A through-hole facing directly is formed, and a sphere is inserted into the through-hole so as to be movable in the radial direction of the cylinder, and the operation cylinder is slidably and circumferentially and axially covered with the cylinder. Internally provided are an inner peripheral surface that presses the sphere into the recess and a relief hole that allows the sphere to escape out of the recess, and a protrusion that holds the operating cylinder in a state where the sphere is pressed into the recess on the inner peripheral surface. The engaging groove is provided in each of the cylindrical portion and the operation cylinder, and when the operation cylinder is slid in the circumferential direction, the state is changed from the state where the sphere is released by the escape hole to the state where the sphere is pressed on the inner peripheral surface, and then the operation cylinder. When the projection is engaged with the engagement groove by sliding the shaft in the axial direction, the operation cylinder presses the sphere into the recess on its inner peripheral surface. In the finger chuck attaching / detaching device, the engagement groove is formed as a closed groove extending in the axial direction on the operation cylinder and ending at both ends, and the operation is performed from one closed end of the engagement groove. A guide groove extending in the circumferential direction of the cylinder and ending at the end is formed in the operation cylinder. When the operation cylinder is slid in the circumferential direction and the projection is slid from the end to the closed end of the engagement groove in the guide groove, The cylinder moves from a state where the sphere is released by the escape hole to a state where the sphere is pressed on the inner peripheral surface, and then the operation cylinder is slid in the axial direction, and the protrusion is closed in the engagement groove on the opposite side from the closed end. An apparatus for attaching and detaching a finger chuck, characterized in that when being slid to the end, the operating cylinder is held in a state where the spherical body is pressed into the recess on the inner peripheral surface thereof.   2. The finger chuck attaching / detaching device according to claim 1, wherein the cylindrical portion is rotatably held at the tip of the feed rod.   3. The finger chuck attaching / detaching device according to claim 1 or 2, wherein the operating cylinder is always urged by an elastic body so that the operating cylinder maintains a state in which the operating cylinder presses the sphere into the recess. A finger chuck attaching / detaching device characterized by the above.   4. The finger chuck attaching / detaching device according to claim 1, wherein the operation cylinder is formed so that an outer diameter thereof is smaller than an outer diameter of the finger chuck. apparatus.   5. The finger chuck attaching / detaching device according to claim 1, wherein a clutch that is detachably engaged when the shaft portion is inserted into the tube portion is provided between the shaft portion and the tube portion. A finger chuck attaching / detaching device characterized in that the finger chuck is attached.

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