JP6629686B2 - Rotary chuck - Google Patents

Description

  The present invention relates to a rotary chuck used when a plurality of processing parts are machined by rotating a work around a rotation axis.

  When rotating a work around a rotation axis to machine a plurality of processing portions, a rotary chuck is generally used. The rotary chuck includes a driving-side clamp and a driven-side clamp for clamping a workpiece on both sides in the axial direction of the rotation axis, and a drive motor for driving the drive-side clamp so as to be indexable around the rotation axis. After the work is clamped by the driving clamp and the driven clamp, the drive clamp is driven around the rotation axis by the drive motor so that the plurality of machining parts of the work correspond to the tool. There is one in which index rotation is performed (Patent Document 1).

  In the clamp type, the clamps on both sides of the rotation axis in the axial direction tighten the clamped part in the direction orthogonal to the rotation axis and separately clamp, and the clamps on both sides of the rotation axis in the axial direction cooperate. Some clamps are tightened in the axial direction of the rotation axis.

JP-A-6-297222

  Regardless of the clamp type, such a rotary chuck can index the work around the rotation axis by driving one of the clamps disposed on both sides of the work by a drive motor. Therefore, there is an advantage that the entire structure of the chuck is simple, small, and can be manufactured easily and inexpensively.

  However, in the conventional rotary chuck, after the driven clamp is returned to the original position and the work clamp is released, the driven clamp may rotate around the rotation axis, and the driven clamp may be returned to the original position. There is a problem that it is difficult to hold.

  Because the clamp on the drive side and the clamp on the driven side are manufactured according to the shape of the work, the weight balance may be poor depending on the type of work, and the center of gravity when returning to the original position will be the rotation of the clamp. It may be at an eccentric position eccentric laterally from the center.

  Even in such a case, since the drive side clamp is positioned at the original position by the drive motor, there is no problem such as rotation from the original position. However, the driven-side clamp is rotatable, and there is nothing to control the rotation like a drive motor. Therefore, in the driven clamp, if the center of gravity when returning to the original position is located at an eccentric position beside the center of rotation, after the workpiece is released, the center of gravity is located immediately below the center of rotation. , The driven-side clamp may rotate, and the driven-side clamp may not be held at a fixed original position.

  Therefore, in the conventional rotary chuck, there is a large variation in the stop position of the driven clamp in the rotation direction, and the workpiece can be securely clamped by moving the driven clamp toward the work and clamping the work. There is a problem that the workpiece or the clamp is damaged. In addition, when the workpiece cannot be clamped securely, there are problems such as damage to the tool during machining and a decrease in machining accuracy.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to provide a rotary chuck that can securely hold a driven clamp member after returning to an original position and can be structurally simplified. .

The present invention includes a driving-side clamp member and the driven-side clamp fixture for clamping a workpiece, and a drive-side holder and the driven-side holder for rotatably supporting the drive-side clamp member and the driven-side clamp member about a rotation axis, wherein in the rotary chuck provided with a provided on the drive side holder side and the drive side clamp fixture and a rotary drive means can be driven indexing the axis of rotation around, an eccentric position deviated from the center of rotation of the driven-side clamp member A magnet-type driven-side holding unit that is disposed and holds the driven-side clamp tool at the original position by magnetic force when the workpiece is unclamped on the original position side , and the driven-side holding unit is One of a driven rotating side that rotates integrally with the clamp tool and a fixed side that includes the driven holder that rotatably supports the driven clamp tool. A magnet provided, in which a magnetic member provided at a gap between the magnet other one.

Before SL driven holding means may be those located on the opposite side of the driven-side clamp member relative to the driven holder. Said magnet said driven side retaining means on one side of the driven Hol da and the driven-side clamp member arranged to face in the axial direction of the rotation axis, each of the other side before Ki磁 material elements s It may be provided. The driven-side holding means is provided with the magnet on one side of the driven-side clamp and the driven-side holder, and the magnetic body on the other side, which are disposed so as to face each other in the radial direction inside and outside around the rotation axis. It may be provided .

A driven-side clamp member holder for supporting the driven side clamp member, and the driven-side holder for movably supporting the driven-side clamp member holder in the axial direction of the rotation axis, the driven-side holder axial direction of the rotation axis comprising a clamping drive means for driving, and a connecting plate for connecting the driven-side clamp member holder and said arranged to face in the axial direction of the rotation axis and the clamp driving means to the driven side holder, the the driven side retaining means on the opposing end surface of the driven-side clamp member holder and the connection plate may also those disposed to face in the axial direction of the rotational axis.

  According to the present invention, when the clamp of the work is released at the original position side of the rotary chuck, there is provided the driven side holding means for holding the driven side clamp tool at the original position. There is an advantage that it can be securely held in the original position and can be simplified in structure.

It is a front sectional view of a rotary chuck showing a 1st embodiment of the present invention. FIG. It is an irregular side view sectional drawing. It is a front view of the same work. It is a top view of the same driven side clamp tool. It is a side view of the same driven side clamp tool. It is sectional drawing of the driven side holding means. FIG. It is sectional drawing of the driven side holding means which shows 2nd Embodiment of this invention. FIG. 9 shows a third embodiment of the present invention, in which (a) is a cross-sectional view of a driven side holding means, and (b) is a side view thereof. It is sectional drawing of the driven side holding means which shows 4th Embodiment of this invention. It is a plane sectional view showing a 5th embodiment of the present invention. FIG. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 8 illustrate a first embodiment of the present invention. The rotary chuck 1 of this embodiment has a configuration as shown in a front sectional view of FIG. 1, a plan sectional view of FIG. 2, and an irregular side sectional view of FIG. 3, and is used for a tool rotary type machine tool such as a milling machine or a machining center. It is mounted on a movable table and is used when a plurality of processing parts in the rotation direction of the work 3 are machined by the tool 2.

  The work 3 is, for example, a 45 ° Y pipe joint. As shown in FIG. 4, the pipe joint includes a main body 4 and a branch 5 where center lines 4a and 5a intersect at one point, and the main body 4 and the branch 5 have a plurality of end faces, inner diameters and the like. Machining part.

  When machining each machining portion of the work 3 having such a plurality of machining portions, the rotary chuck 1 is used, and while the work 3 is clamped and rotated about the rotation axis 6, each machining portion is To a predetermined rotation angle corresponding to.

  As shown in FIGS. 1 to 3, the rotary chuck 1 is disposed on both sides of the rotation axis 6 with respect to the workpiece 3 in the axial direction, and clamps the workpiece 3 from both sides of the rotation axis 6 in the axial direction. The drive-side clamp 10 and the driven-side clamp 11, the drive-side clamp 12 and the driven-side clamp 13 that support the drive-side clamp 10 and the driven-side clamp 11, the drive-side clamp 10 and the driven-side clamp A driving-side holder 14 and a driven-side holder 15 that support the driving-side clamping tool holder 12 and the driven-side clamping tool holder 13 on the side opposite to the workpiece 3 with respect to the clamping tool 11, and a driving-side clamp attached to the driving-side holder 14. Drive means 16 for rotating the drive-side clamp tool 10 around the rotation axis 6 so as to be indexable via the tool holder 12, and a driven-side holder A guide means 18 for guiding the rotary shaft 5 linearly in the axial direction of the rotation axis 6, a driven side holder 15 and a driven side clamp via the driven side clamp fixture holder 13 along the guide means 18 in the axial direction of the rotation axis 6. The clamp driving means 17 for driving the tool 11 in the axial direction of the rotation axis 6 (clamping / unclamping direction), the driven-side holding means 19 for holding the driven-side clamp tool 11 at the original position H, and all of them are supported. And a mounting base 20.

  The driving side clamp 10 and the driven side clamp 11 cooperate with each other to clamp the work 3 by clamping the work 3 from both sides thereof in the axial direction of the rotation axis 6. Clamp portions 21 and 22 formed corresponding to the side surface shape of the portion 4 and receiving portions 23 and 24 for receiving the work 3 from below under the clamp portions 21 and 22 are provided on the distal end side. It is detachably fixed to the driving side clamp fixture holder 12 and the driven side clamp fixture holder 13 by fixtures 25 and 26 such as screws.

  The clamp portions 21 and 22 have a substantially V-shape in plan view so that the main body portion 4 of the work 3 can be clamped from both sides in the axial direction of the rotation axis 6 as shown in FIGS. In addition, the amount of protrusion of the rotation axis 6 in the axial direction is shorter by the dimension A than the side opposite to the branch 5 so that the branch 5 does not contact the branch 5 when the main body 4 is clamped.

  Therefore, due to the difference in the amount of protrusion on both sides of the clamp portions 21 and 22 and the receiving portions 23 and 24, the center of gravity G of the driving-side clamp member holder 12 and the driven-side clamp member holder 13 is, as shown in FIG. When stopped at the position H, it is obliquely below the rotation center O, and is eccentric by an eccentric amount B in the horizontal direction with respect to the rotation center O.

  The driving-side clamp holder 12 and the driven-side clamp holder 13 are integrally provided with flanges 27 and 28 and rotating shafts 29 and 30 projecting from the flanges 27 and 28 to the opposite side to the workpiece 3. Are supported on substantially the same rotation axis 6 by the drive-side holder 14 and the driven-side holder 15 via the thrust bearings 31 and 32 and the radial bearings 33 and 34 on the rotation shafts 29 and 30, and around the rotation axis 6. It is freely rotatable.

  The center lines 4a and 5a of the work 3 intersect at an intersection 6a as shown in FIG. 4, and the intersection 6a is set on the rotation axis 6 of the rotation shafts 29 and 30. Therefore, the workpiece 3 rotates at an indexing angle corresponding to the tool 2 around the intersection 6a of the center lines 4a and 5a while being clamped by the drive-side holder 14 and the driven-side holder 15.

  The drive side holder 14 is fixed on a mounting base 20. The guide means 18 is opposed to the drive-side holder 14 and is fixed on the mounting base 20, and the rotation axis of each of the clamp holders 12 and 13 astride the drive-side holder 14 and the fixed holder 35. A plurality of guide rods 36 are supported substantially in parallel to 29 and 30, and the driven side holder 15 is slidably supported in the axial direction of the rotation axis 6 by the guide rods 36. The drive-side holder 14 and the fixed holder 35 are detachably fixed to the attachment base 20, and the attachment base 20 is detachably fixed to a movable table of a machine tool.

  Two guide rods 36 are arranged on the upper side of the clamp members 10 and 11, and one guide rod is arranged on the lower side. The upper two guide rods 36 are arranged between the two clamps 10 and 11 with a space required for attaching and detaching the work 3 from above. The lower one guide rod 36 is disposed below the clamps 10 and 11 at substantially the center between the two upper guide rods 36.

  In addition, although the guide rods 36 are three on the upper side and one on the lower side, it is also possible to arrange two guide rods on both the upper and lower sides, and to sandwich the clamp members 10 and 11 in the middle in the vertical direction. As described above. The guide means 18 may be any as long as it can guide the driven-side holder 15 in the axial direction of the rotation axis 6, and may be a rod type or a type having a rail having a dovetail structure or the like.

  The rotation drive means 16 is constituted by a drive motor 37 such as a servomotor or a stepping motor. The drive motor 37 is detachably mounted on the motor body side via a mounting plate 38 on the opposite side of the drive side holder 14 from the drive side clamp 10, and the drive shaft 39 is inserted into the rotation shaft 29 of the drive side clamp holder 12. Are combined.

  The clamp driving means 17 is constituted by a cylinder 40. The cylinder 40 is fixed to the fixed holder 35 on the side surface of the cylinder 40 on the side opposite to the fixed holder 35 with respect to the fixed holder 35, and the piston rod 41 passes through the through hole of the fixed holder 35 and Extending to the side. The distal end of the piston rod 41 is connected to the driven-side holder 15 via a connecting plate 42.

  The connecting plate 42 is arranged on the opposite side of the driven-side clamp tool 11 with respect to the driven-side holder 15 and close to the end face of the rotating shaft 30 of the driven-side clamp tool holder 13. The outer peripheral side of the connecting plate 42 is detachably fixed to the driven-side holder 15 with a fixing tool 43 such as a screw, and the piston rod 41 is connected to a central portion on the opposite side to the driven-side holder 15.

  The driven-side holding means 19 is for holding the driven-side clamp tool 11 so as not to move unstably from the original position H after releasing the clamp of the work 3. As shown in FIG. When the driven member 11 returns to the original position H, the eccentric position is eccentric with respect to the rotation center O of the driven-side clamp tool 11 by the dimension C, and the eccentric position is disposed on the opposed end face side of the driven-side holder 15 and the connecting plate 42. ing.

As shown in FIGS. 5 and 7, the driven side holding means 19 is fixed to the permanent magnet 45 provided on the connecting plate 42 and the rotating shaft 30 of the driven side clamp tool holder 13, and the driven side clamp tool 11 is When the original position H is at the original position H, the permanent magnet 45 is opposed to the magnetic body 46. When the driven clamp 11 is at the original position H, the permanent magnet 45 and the magnetic body 46 are magnetically coupled to each other and the driven side clamp 11 Is magnetically held at the original position H. The permanent magnet 45 and the magnetic body 46 are inserted into and fixed in the recesses 47 and 48, and the front ends thereof project toward the other side and are opposed to each other with a slight gap.

  The permanent magnet 45 and the magnetic body 46 have substantially the same diameter at their opposite end surfaces as shown in FIGS. 5 and 7, but in FIGS. 6 and 8, the permanent magnet 45 is It is described in larger diameter than that. Of course, the diameter of the permanent magnet 45 may be slightly larger than that of the magnetic body 46, or the diameter of the magnetic body 46 may be slightly larger than that of the permanent magnet 45.

In providing the permanent magnet 45 and the magnetic body 46, the magnetic body 46 may be arranged on the connecting plate 42, and the permanent magnet 45 may be arranged on the rotation shaft 30 of the driven clamp holder 13, contrary to the embodiment. . Also, an electromagnet can be used instead of the permanent magnet 45. However, the permanent magnet 45 can be manufactured more easily and inexpensively than an electromagnet that requires wiring of a power supply line and the like, and can be downsized and incorporated in a narrow space.

  The drive side holder 14 is provided with a cover 52 for covering the rotation drive means 16, and the driven side holder 15 is provided with a fixed holder 35 and a cover 53 for covering the clamp drive means 17. A chip removing cover (not shown) is provided on the mounting base 20 so as to protect the guide rod 36 from chips generated during processing of the work 3.

  The machine tool provided with such a rotary chuck 1 is used as follows. The driving-side clamp 10 is held at the original position H by the drive motor 37, and the driven-side clamp 11 is held at the original position H by the driven-side holding means 19. On the other hand, in the driven side holding means 19, when the driven side clamp 11 is at the original position H, the magnetic body 46 faces the permanent magnet 45 as shown in FIGS. The driven clamp 11 is held at the original position H by the magnetic force acting between the clamp 46 and the magnetic body 46.

  Therefore, despite the fact that the center of gravity G of the driving-side clamp 10 and the center of gravity G of the driven-side clamp 11 is shifted laterally from the rotation center O of the driven-side clamp 11, the driven-side clamp 3 ends after the machining of the preceding work 3 is completed. When the tool 11 is returned to the original position H, the driven-side clamp tool 11 can be held at the original position H by the driven-side holding means 19.

  In a state where the driving-side clamp 10 and the driven-side clamp 11 are at the original position H, first, the work 3 to be processed is loaded on the drive-side clamp 10, and then the driven-side clamp 11 is advanced by the cylinder 40. Then, the driven-side clamp tool 11 abuts on the work 3 and cooperates with the drive-side clamp tool 10 to tighten the work 3 from both sides thereof in the axial direction of the rotation axis 6. Work 3 can be clamped. The loading of the work 3 onto the driving-side clamp 10 may be performed manually or automatically.

  When the workpiece 3 is clamped, the driving clamp 10 is held at the original position H by the drive motor 37, and the driven clamp 11 is moved to the original position H by the driven holding means 19 having the permanent magnet 45 and the magnetic body 46. Is held. In addition, the clamp portions 21 and 22 of the driving-side clamp 10 and the driven-side clamp 11 are manufactured in a shape corresponding to the side surface shape of the work 3.

  Accordingly, the workpiece 3 can be easily and reliably clamped by the driving-side clamp 10 and the driven-side clamp 11 by advancing the driven-side clamp 11 toward the work 3. In addition to preventing the side clamp 10, the driven side clamp 11 and the work 3 from being damaged, it is also possible to prevent the tool 2 from being damaged and the processing accuracy from being lowered.

  When the first processing of the work 3 is performed at the original position H, the processing may be immediately shifted to the processing after the work 3 is clamped. When the machining at the original position H is completed, as shown in FIG. 8, the workpiece 3 is rotated to the indexing angle I corresponding to the next machining portion to perform the machining.

  In this case, first, the driving-side clamp 10 is driven around the rotation axis 6 by the drive motor 37, and the driven-side clamp 11 is rotated integrally with the drive-side clamp 10 around the rotation axis 6 via the work 3. Then, the work 3 is positioned at a predetermined angle.

  While the workpiece 3 is being clamped, the driven clamp 11 is pressed toward the drive clamp 10 by the cylinder 40. However, the drive-side clamp fixture holder 12 and the driven-side clamp fixture holder 13 that support the drive-side clamp fixture 10 and the driven-side clamp fixture 11 are connected to the drive-side holder 14 and the driven clamp fixture 13 via the thrust bearings 31 and 32 and the radial bearings 33 and 34. Since the workpiece 3 is supported by the side holder 15, the driving-side clamp 10 and the driven-side clamp 11 in a state where the work 3 is clamped can be smoothly rotated around the rotation axis 6.

  The driven-side clamp 11 at the original position H is held by the driven-side holding means 19. However, if the driven-side clamp 11 rotates around the rotation axis 6, the permanent magnet 45 of the driven-side holding means 19 and the The body 46 will move away in the direction of rotation as shown in FIG.

  However, the driven-side holding means 19 employs a magnet type in which the driven-side clamp 11 is held at the original position H by a magnetic force acting between the permanent magnet 45 and the magnetic body 46. The holding force of the driven-side clamp 11 is easily released by the rotational force transmitted to the driven-side clamp 11 from the work 3 via the work 3, and the work 3 can be easily rotated in the indexing direction.

  When the machining of each processing portion of the work 3 is completed, the drive clamp 10 is driven to the original position H side by the drive motor 37, and the drive clamp 10, the work 3, and the driven clamp 11 are integrated. To the original position H. Then, the driven side clamp fixture 11 is moved backward by the cylinder 40 via the driven side holder 15 and the driven side clamp fixture holder 13, and the processed workpiece 3 is taken out.

  As described above, when there are a plurality of processing portions in the rotation direction, it is possible to perform multi-face processing while sequentially indexing the work 3 into each processing angle. Therefore, despite the fact that there are a plurality of processing parts in the rotation direction, all the processing is possible by only clamping the work 3 once and then rotating the work 3 about the rotation axis 6 of the work 3, which is easy and Processing can be performed efficiently.

  Therefore, in the case of a work 3 such as a pipe joint in which a plurality of center lines 4a and 5a intersect at one point, by setting the intersection point on the rotation axis 6, the processing can be performed without step change. Further, in the case of a machine tool equipped with a tool changing device, it is possible to perform end face processing and inner diameter processing only by changing the tool 2, thereby improving productivity.

  Further, there is a driven-side holding means 19 between the driven-side holder 15 and the connecting plate 42, and when the driven-side clamp 11 returns to the original position H, the magnetic body 46 of the driven-side clamp 13 becomes permanent. The magnet 45 is attracted by its magnetic force. Therefore, in a state where the driven-side clamp 11 is returned to the original position H, even if the center of gravity G is eccentric from the rotation center O, the driven-side clamp 11 is retracted from the work 3 and the clamp is released. The driven clamp 11 can be securely held at the original position H by the magnetic force acting between the permanent magnet 45 and the magnetic body 46.

  Therefore, when the next work 3 is clamped, the driven clamp 11 is advanced by the cylinder 40 toward the drive clamp 10, so that the work 3 is clamped by the drive clamp 10 and the driven clamp 11. Can be easily and reliably clamped from both sides of the rotation axis 6 in the axial direction.

  Further, the driven side holding means 19 includes a permanent magnet 45 on the connecting plate 42 side and a magnetic body 46 on the rotating shaft 30 side of the driven side clamp fixture holder 13, and uses the magnetic force (attraction force) between the two to drive the driven side. Since the clamp 11 is formed, the driven-side holding means 19 is structurally simple and can be easily and inexpensively adopted. Further, the holding of the driven-side clamp 11 when returning to the original position H, the driven-side clamp It is possible to smoothly release the holding when the 11 moves from the original position H.

  Further, since the rotary chuck 1 can be mounted on an existing or existing tool-rotating machine tool (milling machine, machining center, etc.), the equipment cost can be reduced. Further, since there is the driven side holding means 19, and the weight balance after the driven side clamp tool 11 returns to the original position H does not become a problem, the driven side clamp tool 11 having an optimal design according to the shape of the work 3 is employed. Can be. Therefore, it is possible to increase the clamp area in accordance with the shape of the work 3, and it is possible to clamp the work 3 with higher accuracy and higher force.

  In addition, the rotary chuck 1 is suitable for mass production of a small-diameter work 3. The work 3 of the pipe joint includes cheese, cloth, elbow, and the like, and is also suitable for processing a small-diameter work 3 having a plurality of processing positions in the rotation direction.

  FIG. 9 illustrates a second embodiment of the present invention. In the driven side holding means 19, permanent magnets 49 and 50 are provided on both the connecting plate 42 side and the driven side clamp fixture holder 13 so as to face each other in the axial direction of the rotation axis 6. Each of the permanent magnets 49 and 50 has a different magnetic pole on the opposite end side, so that an attractive force is generated between the two.

  In this manner, the permanent magnets 49 and 50 may be provided on both the connecting plate 42 side and the driven side clamp fixture holder 13. The driven holding means 19 is eccentrically arranged with respect to the rotation center O of the driven clamp 11. Other configurations are the same as the axial direction of the first rotation axis 6.

  FIGS. 10A and 10B illustrate a third embodiment of the present invention. The driven side holding means 19 includes a permanent magnet 45 on the connecting plate 42 side and a magnetic body 46 on the rotating shaft 30 side of the driven side clamp fixture holder 13, and a rotation axis passing through the rotation center O of the driven side clamp fixture 11. 6 or in the vicinity thereof.

  The permanent magnet 45 and the magnetic body 46 are elongated in the diameter direction of the rotating shaft 30 so as to pass on or near the rotating axis 6 of the rotating shaft 30. The permanent magnet 45 is provided with N-pole and S-pole magnetic poles at both ends in the longitudinal direction. When the driven-side clamp 11 is located at the original position H, the permanent magnet 45 and the magnetic body 46 are arranged such that their opposing end surfaces are substantially parallel to each other.

  Note that the permanent magnet 45 may be disposed on the driven-side clamp holder 13 and the magnetic body 46 may be disposed on the connecting plate 42. In this case, when the driven-side clamp 11 returns to the original position H, the permanent magnet 45 and the magnetic body 46 approach each other, and the driven-side clamp 11 stops around the position rotated by 180 ° from the original position H. You need to avoid it. Other configurations are the same as the axial direction of the first rotation axis 6.

  Also in this case, when the driven-side clamp 11 returns to the original position H, the N pole and the S pole of the permanent magnet 45 come close to both ends of the magnetic body 46, so that the permanent magnet 45 and the magnetic body 46 Is formed, and the driven clamp 11 can be magnetically held at the original position H by the magnetic force generated between the two.

  In the case of the driven-side holding unit 19 including the permanent magnet 45 and the magnetic body 46, the driven-side holding unit 19 can be disposed at a substantially central portion of the driven-side clamp 11.

  The permanent magnet 45 and the magnetic body 46 are configured to be longer in the diameter direction of the rotating shafts 29 and 30, and a permanent magnet 45 having an N pole and a permanent magnet 45 having an S pole on the side facing the magnetic body 46 are provided. The rotating shafts 29 and 30 may be arranged on both sides in the diameter direction, and the magnetic bodies 46 may be arranged so as to correspond to the respective permanent magnets 45. Further, if there is a sufficient space between the two permanent magnets 45, the two permanent magnets 45 may be arranged so that the magnetic poles are the same. The driven-side holding means 19 provided with the permanent magnet 45 and the magnetic body 46 can be provided eccentrically with respect to the rotation center O of the driven-side clamp 11. The magnetic body 46 is constituted by a permanent magnet, and when the driven side clamp 11 returns to the original position H, the N pole and the S pole of the permanent magnet are close to the N pole and the S pole of the permanent magnet 45. It may be.

FIG. 11 illustrates a fourth embodiment of the present invention. The driven-side holding means 19 includes a permanent magnet 45 provided integrally with the connecting plate 42 and a magnetic body 46 on the rotating shaft 30 side of the driven-side clamp holder 13. The connecting plate 42 is made of a magnetic material such as iron, and has a protruding portion 45 a protruding toward the magnetic body 46. The connecting plate 42 corresponding to the protruding portion 45 a is NS NS in the axial direction of the rotation axis 6. Are magnetized and magnetized so as to form a magnetic pole. Note that the protrusion 45a may not be provided. Other configurations are the same as those of each embodiment.

  As described above, the permanent magnet 45 can also be configured by utilizing a part of the connecting plate 42 and magnetizing a part thereof. Therefore, the permanent magnet 45 may be provided either integrally or separately.

  12 to 14 illustrate a fifth embodiment of the present invention. Also in the rotary chuck 1 adopting the clamp type as shown in FIGS. 12 to 14, the driven-side holding member 19 similar to each embodiment is provided on the driven-side clamping member 11 side, and the driven-side clamping member 11 is returned. It is possible to secure the original position H at the time of the above.

  The rotary chuck 1 shown in FIG. 12 employs a clamp type in which the drive-side clamp 10 and the driven-side clamp 11 cooperate to clamp the work 3 in a direction perpendicular to the rotation axis 6 (hereinafter referred to as an orthogonal direction). I have. The drive-side clamp 10 and the driven-side clamp 11 are clamp jigs 55 and 56 disposed on both sides in the direction orthogonal to the rotation axis 6 with the work 3 interposed therebetween, and support members for supporting the clamp jigs 55 and 56. 57 and 58. The driven clamp 11 has a clamp jig 56 that is slidable in a direction perpendicular to the rotation axis 6 with respect to the support member 58. A cylinder type or a screw type that drives the clamp jig 56 in a direction orthogonal to the rotation axis 6. Is provided.

  The clamp jig 56 of the driven-side clamp 11 may be fixed and the clamp jig 55 of the drive-side clamp 10 may be moved by the driving means. Alternatively, the driven-side clamp 11 and the driven-side clamp 11 may be moved. The two clamp jigs 55 and 56 may be moved by the driving means. Therefore, at least one of the clamp jigs 55 and 56 only needs to be movable in the clamp direction of the work 3 by the driving means.

  When the work 3 is clamped, the clamp jig 56 of the driven clamp 11 is moved forward by the clamp driving means 59, and the work 3 is clamped in the direction orthogonal to the rotation axis 6 based on the drive clamp 10. Clamp.

  The rotary chuck 1 shown in FIG. 13 employs a clamp type in which the workpiece 3 is separately clamped in the axial direction of the rotation axis 6 by the driving-side clamp 10 and the driven-side clamp 11. The driving-side clamp 10 and the driven-side clamp 11 include a pair of clamp jigs 55, 56 disposed on both sides of the rotation axis 6 with respect to the workpiece 3 in the axial direction, and a pair of clamp jigs 55, 55. Support members 57 and 58 for supporting the movable member 56 relatively in the axial direction of the rotation axis 6, and clamp driving means 60 and 61 for driving each pair of clamp jigs 55 and 56 in the axial direction of the rotation axis 6. And

  When the work 3 is clamped, the pair of clamp jigs 55 and 56 of the drive side clamp 10 and the driven side clamp 11 are relatively moved in the axial direction of the rotation axis 6 by the clamp driving means 60 and 61. Thus, the workpiece 3 is separately clamped in the axial direction of the rotation axis 6 by the driving side clamp 10 and the driven side clamp 11. At this time, the pair of clamp jigs 55 and 56 on both sides of the work 3 may be simultaneously moved in the clamp direction, or one of the pair of clamp jigs 55 and 56 may be fixed and the other may be fixed. It may be moved to one side.

  The rotary chuck 1 shown in FIG. 14 employs a clamp type in which the workpiece 3 is separately clamped in a direction orthogonal to the rotation axis 6 by the driving-side clamp 10 and the driven-side clamp 11. The driving-side clamp 10 and the driven-side clamp 11 include a pair of clamp jigs 55 and 56 disposed on both sides of the workpiece 3 in the direction orthogonal to the rotation axis 6 with respect to the clamped portions 62 and 63, respectively. Support members 57, 58 for supporting the clamp jigs 55, 56 in a direction perpendicular to the rotation axis 6 so as to be relatively movable, and a clamp driving means 60, for driving the clamp jigs 55, 56 in the direction orthogonal to the rotation axis 6, 61.

  The pair of clamp jigs 55 of the driving-side clamp 10 and the pair of clamp jigs 56 of the driven-side clamp 11 may move in the direction of clamping the work 3, respectively. One may be fixed and the other may move to one side. Therefore, at least one of the pair of clamp jigs 55 and 56 only needs to be movable by the driving means.

  The drive-side clamp 10 and the driven-side clamp 11 are removably mounted on the drive-side clamp-holder 12 and the driven-side clamp-holder 13. The drive-side clamp 12 and the driven-side clamp 13 are mounted on the drive-side. The fixed holder 64 and the driven-side fixed holder 65 rotatably support about the rotation axis 6. The driving-side fixed holder 64 is fixed on the mounting base 20, but the driven-side fixed holder 65 is provided on the mounting base 20 so as to be relatively movable in the axial direction of the rotation axis 6 with respect to the driving-side fixed holder 64. You may.

  Also in the rotary chuck 1 adopting each of the clamping methods, the driven side holding member 19 similar to that of each embodiment is provided on the driven side clamping member 11 side so that the original when the driven side clamping member 11 is returned. Position H can be secured. Therefore, the driving-side clamp 10 and the driven-side clamp 11 may cooperate to clamp the work 3 or may clamp the work 3 separately.

  The driven-side holding means 19 is provided between the rotation shaft 30 of the driven-side clamp holder 13 and the support plate 66 fixed to the driven-side fixed holder 65. Any of the first to fourth embodiments can be adopted as the driven-side holding means 19.

  As described above, the embodiment of the present invention has been described in detail, but the present invention is not limited to this embodiment, and various modifications can be made. For example, as the driven side holding means 19, a magnet type in which a permanent magnet 45 and a magnetic body 46 are combined is exemplified, but in addition to the magnet type, the driven side holding means 19 is fixed to a rotating side opposed to the rotation axis 6 in the axial direction. It may be a mechanical contact type or the like having an engaging portion such as a holding concave portion on one side and an engaging tool detachable from the engaging portion on the other side.

  In short, the driven-side holding means 19 can uniformly hold the driven-side clamp 11 at the original position H after returning to the original position H regardless of whether the weight balance of the driven-side clamp 11 is good or bad. Is enough.

  Although the pipe joint is illustrated as the work 3, it may be other than the pipe joint. In the rotary chuck 1, the work 3 to be clamped has a plurality of processing portions in the rotation direction. However, the workpiece 3 having one processing portion can be freely used.

  The drive-side clamp 10 and the driven-side clamp 11 of the embodiment are configured to cooperate to clamp the work 3 by clamping the work 3 from both sides in the axial direction of the rotation axis 6. A pair of clamp means is constituted by the and the driven-side clamp tool 11. However, the present invention can be similarly implemented other than the one in which the driving side clamp 10 and the driven side clamp 11 cooperate to clamp the work 3.

  The drive-side clamp 10 and the driven-side clamp 11 are desirably fixed to the drive-side holder 14 and the driven-side holder 15 so as to be detachable in order to be exchanged according to the work 3. The clamp tool holder 12, the driven-side clamp tool 11, and the driven-side clamp tool holder 13 may be provided integrally.

  In arranging the rotation driving unit 16 and the clamping driving unit 17 on the rotation axis 6 or in the axial direction of the rotation axis 6, the rotation driving unit 16 is provided with a driving motor 37 and the clamping driving unit 17. Although the cylinder 40 is generally used for each, a drive source other than the drive motor 37 and the cylinder 40 may be used.

  The driven-side holding means 19 includes a permanent magnet 45 on one of the rotating side (the driven-side clamp 11 side) and the fixed side opposed to each other in the axial direction of the rotation axis 6 such as a combination of the permanent magnet 45 and the magnetic body 46. By providing the magnetic body 46 on the other side, the driven side holding means 19 itself can be structurally simplified. However, the permanent magnet 45 may be arranged on one of the rotating side and the fixed side of the outer periphery, and the magnetic body 46 may be arranged on the other side.

  Further, the driven side holding means 19 is preferably a magnet type. In this case, the driven side clamp 11 may be held at the original position H by using a repulsive force in addition to using a magnetic attraction force.

DESCRIPTION OF SYMBOLS 1 Rotary chuck 2 Tool 3 Work 6 Rotation axis 10 Driving clamp 11 Driving clamp 12 Driving clamp holder 13 Driving clamp holder 14 Driving holder 15 Driving holder 16 Driving means for rotation 17 Driving means for clamping 19 driven side holding means 37 drive motor 40 cylinder 45 permanent magnet 46 magnetic body

Claims (5)

A drive-side clamp and a driven-side clamp for clamping a work;
A drive-side holder and the driven-side holder for rotatably supporting the drive-side clamp member and the driven-side clamp member about a rotation axis,
In the rotary chuck provided with a rotary drive means can be driven indexing a and the driving-side clamp member provided on said drive side holder side to the rotation axis around,
A magnet-type driven-side holding member that is disposed at an eccentric position deviated from the rotation center of the driven-side clamp tool and holds the driven-side clamp tool at the original position by magnetic force when the workpiece is released from the original position. With means ,
The driven-side holding means is provided on one of a driven rotating side that rotates integrally with the driven-side clamp tool and a fixed side that includes the driven holder that rotatably supports the driven-side clamp tool. A rotary chuck comprising: a magnet; and a magnetic body provided with a gap between the magnet and the other side . 2. The rotary chuck according to claim 1, wherein the driven-side holding unit is disposed on a side opposite to the driven-side clamp with respect to the driven-side holder. 3. Said magnet said driven side retaining means on one side of the driven Hol da and the driven-side clamp member arranged to face in the axial direction of the rotation axis, each of the other side before Ki磁 material elements s the rotary chuck according to claim 1 or 2, characterized in that it comprises. The driven-side holding means is provided with the magnet on one side of the driven-side clamp and the driven-side holder, and the magnetic body on the other side, which are disposed so as to face each other in the radial direction inside and outside around the rotation axis. the rotary chuck according to claim 1 or 2, characterized in that it comprises. A driven-side clamp tool holder that supports the driven-side clamp tool,
The driven-side holder that supports the driven-side clamp tool holder so as to be movable in the axial direction of the rotation axis,
A clamping drive means for driving the driven side holder in the axial direction of the rotation axis,
And a connecting plate for connecting the driven-side clamp member holder and to face in the axial direction of the rotation axis is arranged and the clamping drive means to said driven side holder,
According to any one of claims 1-4, characterized in that the driven-side retaining means on the opposing end face side of said connecting plate and said driven side clamp fixture holder and opposed to each other in the axial direction of the rotation axis Rotary chuck.

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