JP2008110456A - Holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding device with extremely excellent practicality capable of being miniaturized, while improving connecting force of a base member and a tool holder. <P>SOLUTION: This holding device connects a spindle 1 of a machine tool and a tool holder 2 fitted to the spindle 1. The holding device has a claw member 3 for holding the tool holder 2, a locking mechanism for spreading the claw member 3 and locking the claw member 3 on the tool holder 2, a holding mechanism for holding the tool holder 2 by the claw member 3 by drawing the claw member 3 locked on the tool holder 2, and an interlocking operation mechanism for interlocking and operating the locking mechanism and the holding mechanism. The interlocking operation mechanism is constituted of an eccentric cam 13. By rotating the eccentric cam 13, the locking mechanism is operated. By further rotating the eccentric cam 13, the holding mechanism is operated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a holding device.

  As a holding device for holding tools such as end mills, reamers, boring, drills, taps, etc., the main shaft of the machine tool is connected to a tool holder fitted to the main shaft and provided with a tool at the tip, and a claw provided on the main shaft There is one that expands the member and clamps the tool holder by the claw member.

  Specifically, for example, as disclosed in Patent Document 1, a draw bar that expands a pair of claw members that are engaged with the inner wall of the base end of the tool holder is provided on the inside of the claw member, and the draw bar is advanced. In general, the claw member is expanded to be engaged, the claw member is locked to the tool holder, and the main shaft and the tool holder are connected.

Japanese Patent No. 3085354

  However, in the configuration as disclosed in Patent Document 1, the coupling force between the spindle and the tool holder is still insufficient, and further enhancement of the coupling force is desired.

  The present invention has been made in view of the above-described demands. The main shaft and the tool holder are connected to each other by expanding the claw member and engaging the tool holder with the claw member. By performing the operation in two stages of clamping, the tool holder can be firmly clamped by the claw member even if each operation amount is reduced, and the size can be reduced while improving the coupling force between the spindle and the tool holder. It is an object of the present invention to provide a holding device that is extremely practical.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A holding device for connecting a spindle 1 of a machine tool and a tool holder 2 fitted to the spindle 1, the holding device holding a claw member 3 for holding the tool holder 2 and the claw member 3. A latching mechanism that expands and latches the claw member 3 to the tool holder 2, and holds the tool holder 2 by the claw member 3 by pulling the claw member 3 locked to the tool holder 2. A mechanism, and an interlocking operation mechanism for interlockingly operating the locking mechanism and the clamping mechanism, and the interlocking operating mechanism includes a first eccentric cam portion 11 for operating the locking mechanism and a first mechanism for operating the clamping mechanism. The first eccentric cam portion 11 and the eccentric second cam portion 12 are rotated by the eccentric cam 13 to rotate the engagement with the first eccentric cam portion 11. The stop mechanism is activated and the eccentric cam 13 is further rotated. Thus, the holding mechanism is characterized in that the clamping mechanism is operated by the second eccentric cam portion 12.

  2. The holding device according to claim 1, wherein the eccentric cam 13 is a pin body, the first eccentric cam portion 11 and the second eccentric cam portion 12 are provided on the pin body, and the first eccentric cam is further provided. The eccentric directions of the portion 11 and the second eccentric cam portion 12 with respect to the pin body axis are set in the same phase direction, and are related to the holding device.

  The holding device according to claim 2, wherein the first eccentric cam portion 11 and the second eccentric cam portion 12 are provided so that a part thereof overlaps when viewed in the axial direction of the eccentric cam 13. The present invention relates to a characteristic holding device.

  Further, a holding device that connects the spindle 1 of the machine tool and the tool holder 2 fitted to the spindle 1, the holding device includes a claw member 3 that holds the tool holder 2, and the claw member 3 is expanded and the claw member 3 is locked to the tool holder 2. The tool holder 2 is held by the claw member 3 by pulling the claw member 3 locked to the tool holder 2. And an interlocking operation mechanism that interlocks the clamping mechanism and the clamping mechanism, and the interlocking operation mechanism is provided in the first cylinder 42 according to the introduction / extraction of fluid. After actuating the first piston part 40, the second piston part 41 provided in the second cylinder 43 and actuating the clamping mechanism according to the introduction and withdrawal of the fluid, The sequencer is operated to operate the second piston part 41. It relates to a holding device according to claim which is composed of a turbocharger Le controllable switching valve.

  Further, a holding device that connects the spindle 1 of the machine tool and the tool holder 2 fitted to the spindle 1, the holding device includes a claw member 3 that holds the tool holder 2, and the claw member 3 is expanded and the claw member 3 is locked to the tool holder 2. The tool holder 2 is held by the claw member 3 by pulling the claw member 3 locked to the tool holder 2. The holding device is characterized in that it has a clamping mechanism, an interlocking mechanism that interlocks the locking mechanism and the clamping mechanism, and a coolant supply path 22 is further provided.

  The holding device according to any one of claims 1 to 5, wherein the tool holder 2 is a cylindrical body, and the claw member 3 is engaged and clamped on the inner surface of the tool holder 2. The present invention relates to a holding device.

  Further, in the holding device according to any one of claims 1 to 6, the locking mechanism is provided inward of the plurality of claw members 3, and is expanded to expand the claw member 3 by moving backward. The expansion member 6 includes an opening 5 and a locked portion provided on the inner surface of the tool holder 2. The expansion member 5 retracts the claw member 3 by retracting the expansion member 6. The present invention relates to a holding device that is configured to be expanded and locked to the locked portion.

  The holding device according to any one of claims 1 to 7, wherein the clamping mechanism includes a locking advance / retreat member 9 that is locked to an outer position of the claw member 3 and moves forward and backward. The holding device is configured to retract the member 9 to retract the claw member 3 that is expanded by the locking mechanism and locked to the tool holder 2.

  Since the present invention is configured as described above, the tool holder can be firmly held by the claw member even if the operation amounts of the locking mechanism and the holding mechanism are reduced, and the coupling force between the base member and the tool holder can be increased. The holding device can be reduced in size while being improved and is extremely practical.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  By operating the locking mechanism to expand the claw member 3 and locking the claw member 3 to the tool holder 2, the clamping mechanism is operated to retract the claw member 3 and clamp the tool holder 2. 1 and the tool holder 2 are connected. Therefore, even if the operation amount of the claw member 3 in each mechanism is reduced by expanding the claw member 3 in two stages by the locking mechanism and the clamping mechanism, the tool holder 2 is held and held by the claw member 3. The power can be improved.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a holding device for connecting a main spindle 1 of a machine tool and a tool holder 2 fitted to the main spindle 1 and provided with a tool at the tip, and this holding device is a claw for holding the tool holder 2 A member 3, a locking mechanism for expanding the claw member 3 and locking the claw member 3 to the tool holder 2, and the claw member 3 by pulling the claw member 3 locked to the tool holder 2 A coolant supply path 22 for supplying coolant to a tool provided in the tool holder 2, and a interlocking mechanism for interlockingly operating the locking mechanism and the sandwiching mechanism. It is equipped with.

  Each part will be specifically described.

  As shown in FIG. 1, the main shaft 1 has a cylindrical shape, and the main shaft 1 is provided with a flange portion 28, and the flange portion 28 is provided with a bolt hole 23 for attachment to a machine tool. Yes. A tool holder 2 is fitted to the main shaft 1 and is connected to the main shaft 1 by a claw member 3 provided in the main shaft 1.

  The tool holder 2 has a cylindrical shape with a collet chuck that holds a tool, for example, a drill, at the tip and an annular collar 27 at the proximal end. The annular collar 27 is fitted into the main shaft 1 and is a claw member. 3. In addition, a notch (not shown) is formed at a position facing the annular flange 27 so as to be fitted to a projecting piece (not shown) protruding in an opposed state to the inner surface of the main shaft 1. The tool holder 2 is fitted in a non-rotating state with respect to the main shaft 1 by the protruding pieces and the notches.

  The tool holder 2 is not limited to a rotary cutting tool such as a drill, and holds a turning tool such as a bite for turning a workpiece while rotating a workpiece using a lathe, a jig, and the like. Alternatively, the machine tool of this embodiment includes a so-called combined machining apparatus.

  A pair of claw members 3 are provided in the main shaft 1. The claw member 3 is connected to the locking mechanism and the clamping mechanism, and is configured to expand and contract in accordance with the operation of the locking mechanism and the clamping mechanism.

  Specifically, a locking portion 15 that locks with the tool holder 2 is provided at the tip of the claw member 3. A taper locking portion 16 that contacts a taper locking receiving portion 17 (locked portion) formed on the inner surface of the annular collar 27 of the tool holder 2 is provided on the base end side surface of the locking portion 15. The taper receiving surface 18 which receives the taper surface 19 provided in the base end side surface of the expansion part 5 of the expansion member 6 mentioned later as a latching mechanism is provided.

  Further, a locking projection 20 disposed in a loosely fitted state in a groove portion 21 of a locking advance / retreat member 9 described later as a clamping mechanism protrudes outward from the base end portion of the claw member 3. .

  The locking mechanism is provided on the inner side of the pair of claw members 3, and is provided on the inner surface of the tool holder 2 and the expanding member 6 having the expanding portion 5 that expands the claw member 3 by moving backward. The claw member 3 is expanded by the expansion portion 5 by retreating the expansion member 6 and is engaged with the engagement portion in a substantially contact state. Has been.

  The expansion member 6 is provided with a coolant supply path 22 so as to bypass an eccentric cam 13 (pin body), which will be described later, so that the coolant can be supplied to the tool through the expansion member 6 and the tool holder 2. It is configured. This coolant supply path 22 is provided so as to be connected to a coolant supply path provided in the tool holder 2 on the bottom surface of the recess 29 provided in the distal end portion of the expanding member 6. In the figure, reference numeral 36 denotes a closing body that closes an unnecessary portion (perforated during processing) of the coolant supply path 22.

  A large-diameter portion as the expanding portion 5 is provided on the distal end side of the expanding member 6. Therefore, it is possible to secure a sufficient space for drilling the coolant supply path 22 at the tip. A taper surface 19 that engages with a taper receiving surface 18 provided on the distal end side surface of the locking portion 15 of the claw member 3 is provided on the proximal end side surface of the large diameter portion so that the diameter increases toward the outer side. . Further, an insertion hole 24 through which the later-described eccentric cam 13 is inserted as an interlocking operation mechanism is provided on the base end side.

  The clamping mechanism is composed of an annular locking / retracting member 9 that is locked to the outer position of the claw member 3 and moves forward / backward. By retracting the locking / retracting member 9, the clamping mechanism is expanded by the locking mechanism. The claw member 3 locked to the main shaft 1 is pulled into the main shaft 1. The locking advance / retreat member 9 is fitted and disposed in the main shaft 1 together with the expanding member 6, and is provided around the expanding member 6 (between the expanding member 6 and the inner surface of the main shaft 1). It has been.

  On the distal end side of the locking advance / retreat member 9, a groove portion 21 is formed in which a locking projection 20 provided at the base end of the claw member 3 is loosely fitted. By retracting 9, the front surface of the locking projection 20 of the claw member 3 is pulled inward, and the claw member 3 locked with the base end side of the claw member 3 as a fulcrum is strongly attached to the tool holder 2. It is configured to press. In addition, an insertion hole 25 through which an after-mentioned eccentric cam 13 is inserted as an interlocking operation mechanism is provided on the base end side.

  That is, an expansion member 6 as the locking mechanism and a locking advance / retreat member 9 as the clamping mechanism are fitted and disposed inside the main shaft 1, and the claw member 3 has a base end portion. The locking projection 20 provided on the outer side is loosely fitted in the groove portion 21 of the outer locking advance / retreat member 9, and the distal end abuts against the inner expansion member 6. It is provided in the main shaft 1 so as to be prevented from coming off and to be able to expand and contract with the base end as a fulcrum.

  Further, insertion holes 24, 25, and 26 through which the eccentric cam 13 as the interlocking operation mechanism is inserted are in communication with the base end side of the flange portion 28, the expansion member 6 and the locking advance / retreat member 9 of the main shaft 1. The expansion member 6 and the locking advance / retreat member 9 are positioned with respect to the main shaft 1 by the eccentric cam 13. That is, the expansion member 6 and the locking advance / retreat member 9 are simply disposed in the main shaft 1 so that the communication holes 24, 25, and 26 communicate with each other, and the eccentric cam 13 is inserted.

  When the locking advance / retreat member 9 is inserted into the main shaft 1 from the tip side, the protruding piece on which the cutout portion provided at the position opposite to the annular flange 27 of the tool holder 2 is an obstacle becomes an obstacle. In the example, it can arrange | position from the base end opening part 34 of the main axis | shaft 1, and the freedom degree of design of the latching advance / retreat member 9 improves so much. In the figure, reference numeral 35 denotes a lid that is detachably provided at the base end opening 34.

  The interlocking operation mechanism is composed of an eccentric cam 13 having a first eccentric cam portion 11 that operates a locking mechanism and a second eccentric cam portion 12 that operates a clamping mechanism, and by rotating the eccentric cam 13, The locking mechanism is actuated by one eccentric cam portion 11, and subsequently, the clamping mechanism is actuated by the second eccentric cam portion 12.

  The eccentric cam 13 is provided with a first eccentric cam portion 11 at the center, a second eccentric cam portion 12 is provided on both sides of the first eccentric cam portion 11, and a hexagon wrench or the like is provided at one end of the eccentric cam 13. A hexagonal hole 33 for rotating the eccentric cam 13 is provided. The first eccentric cam portion 11 advances and retracts the expanding member 6, and the second eccentric cam portion 12 advances and retracts the locking advance and retract member 9.

  Specifically, the first eccentric cam portion 11 is arranged in the insertion hole 24 of the expanding member 6, and the second eccentric cam portion 12 is arranged in the insertion hole 25 of the locking advance / retreat member 9. ing.

  It is to be noted that the two eccentric cam portions 12 are provided on both sides of the first eccentric cam portion 11 as cam portions for moving the locking advance / retreat member 9 forward and backward in order to make the locking advance / retreat member 9 advance and retract uniformly. Also, one of the second eccentric cam portions 12 is set to have a large diameter and the other has a small diameter. The eccentric cam 13 is inserted through the main shaft 1, the expanding member 6 and the locking advance / retreat member 9 as described above. This is because the insertion distal end side is set to a small diameter and the insertion proximal end side is set to a large diameter.

  Further, in this embodiment, the expansion member 6 as the locking mechanism and the locking advance / retreat member 9 as the clamping mechanism are both moved backward, that is, operated by being drawn into the main shaft 1 by the cam action. Accordingly, the eccentric directions of the first eccentric cam portion 11 and the second eccentric cam portion 12 of the eccentric cam 13 (the eccentric direction with respect to the pin body axis) are set in the same phase direction (that is, the first eccentric cam portion 11). It is possible to provide the eccentric cam portion 11 and the second eccentric cam portion 12 so as to partially overlap each other when viewed in the axial direction of the eccentric cam 13), and the size can be reduced accordingly. For example, when the locking mechanism is operated by moving the expanding member 6 forward and the clamping mechanism is operated by moving the locking advance / retreat member 9 backward, the first eccentric cam portion 11 and the second eccentric cam portion 11 of the eccentric cam 13 are operated. It is necessary to set the eccentric direction of the cam portion 12 to the opposite phase direction, and the size is increased as compared with the present embodiment. Further, since both the first and second eccentric cam portions press the expansion member 6 and the locking advance / retreat member 9 in different directions, the force transmitted by the eccentric cam 13 is dispersed, and the holding force is reduced accordingly. Become.

  Further, as shown in FIG. 4, the cam action by the first eccentric cam portion 11 of the eccentric cam 13 and the eccentric ring portion of the second eccentric cam portion 12 is exerted until the eccentric cam 13 rotates about 135 °. It is configured. Specifically, when the eccentric cam 13 is rotated in the locking direction from the unlocked state, the first eccentric cam portion 11 completes drawing of the expanding member 6 with a rotation of about 65 °, and the rotation with a rotation of about 130 °. Retraction of the locking advance / retreat member 9 by the second eccentric cam portion 12 is completed. In the present embodiment, the amount of eccentricity of the first eccentric cam portion 11 and the second eccentric cam portion 12 is made as small as possible, and the lifting force of the holding member 2 is increased by reducing the amount of elevation. Specifically, the eccentric amount of the second eccentric cam portion 12 is set to be smaller than the eccentric amount of the first eccentric cam portion 11, and the claw member 3 locked to the tool holder 2 by the first eccentric cam portion 11 is set to the second. The eccentric cam portion 12 slowly and steadily presses against the tool holder 2 to increase the locking force.

  Accordingly, as shown in FIG. 2, when the annular rod 27 of the tool holder 2 is fitted into the main shaft 1 and the eccentric cam 13 is rotated, the cam action of the eccentric ring portion of the first eccentric cam portion 11 causes a pair of pairs. The expansion member 6 (the front end portion) protruding from between the claw members 3 is retracted, and the front end side of the claw member 3 is expanded by the expansion portion 5 of the expansion member 6, and the claw member 3 is moved outward. Pressed.

  At this time, the taper receiving surface 18 of the claw member 3 is pressed by the taper surface 19 provided on the base end side surface of the expanding portion 5 of the expanding member 6, and the locking advance / retreat is performed along the taper surface 19 of the expanding portion 5. The claw member 3 expands with the proximal end side of the claw member 3 in which the locking projection 20 is loosely fitted in the groove portion 21 of the member 9 as a fulcrum, and is provided in the locking portion 15 of the claw member 3. The portion 16 is brought into contact with and locked to the taper lock receiving portion 17 on the inner surface of the annular collar 27 of the tool holder 2, and the claw member 3 is locked to the tool holder 2.

  When the eccentric cam 13 is further rotated after the claw member 3 is locked to the tool holder 2, the locking advance / retreat member 9 is retracted by the cam action of the eccentric ring portion of the second eccentric cam portion 12. The claw member 3 in which the locking projection 20 is loosely fitted in the groove 21 of the locking advance / retreat member 9 is drawn into the main shaft 1, and the taper locking portion 16 of the locking portion 15 of the claw member 3 and the tool holder 2. Thus, the tool holder 2 is held tightly by the claw member 3 (FIG. 3).

  At this time, since the cam action of the eccentric cam portion 11 of the eccentric cam 13 and the eccentric wheel portion of the second eccentric cam portion 12 is configured to be exhibited until the eccentric cam 13 rotates about 135 °. In this respect, workability is greatly improved. That is, the workability is greatly improved because the tool holder 2 can be coupled to the main shaft 1 by rotating the eccentric cam 13 in a small range up to about 135 °.

  When the holding device rotates at a high speed, the pair of claw members 3 expands due to the centrifugal force accompanying the high-speed rotation, and the annular collar 27 of the tool holder 2 is pushed further outward from the inner surface, so that the tool holder 2 and the spindle 1 are expanded. And the bond becomes stronger.

  The above is the operation when the tool holder 2 and the main shaft 1 are connected. When the connection between the tool holder 2 and the main shaft 1 is released, the eccentric cam 13 is connected to the tool holder 2 and the main shaft 1. Rotate in the opposite direction to the connection.

  In this embodiment, the interlocking operation mechanism is configured as described above. However, for example, as in the other examples shown in FIGS. A first piston portion 40 that operates the locking mechanism in response to introduction / extraction, a second piston portion 41 that is provided in the second cylinder 43 and operates the clamping mechanism in response to introduction / extraction of fluid, and the first A switch valve that can be sequentially controlled so as to operate the second piston portion 41 after the piston portion 40 is operated may be used. In the figure, reference numeral 47 denotes a lock nut.

  Specifically, before introducing the fluid from the fluid supply paths A and B to the first cylinder 42 and the second cylinder 43 via the switching valve, the disc spring 44 and the springs 45 and 46 are used as shown in FIG. The expansion member 6 and the locking advance / retreat member 9 are pulled in, and the locking mechanism and the clamping mechanism are activated. By introducing the fluid, the disc spring 44 and the springs 45 and 46 are moved as shown in FIG. The expanding member 6 and the locking advance / retreat member 9 are advanced against the biasing force to release the locking mechanism and the clamping mechanism. That is, when the tool holder 2 is fitted to the main shaft 1, the fluid is introduced from the fluid supply paths A and B to release the locking mechanism and the clamping mechanism, and after the tool holder 2 is fitted, the fluid supply path Stop the supply of fluid to B with a valve, etc., return the fluid to the tank, release the pressure of the fluid and operate the locking mechanism, then stop the supply of fluid to the fluid supply path A with a valve, etc. The tool holder 2 can be clamped by the claw member 3 by returning to the tank and releasing the fluid pressure to operate the clamping mechanism. In this case, the tool holder can be held more easily and reliably without the need to operate the tool such as a wrench by automatically operating the first piston portion and the second piston portion sequentially.

  Since the present embodiment is configured as described above, the claw member 3 is expanded by operating the locking mechanism and the claw member 3 is locked to the tool holder 2, and then the clamping mechanism is operated to operate the claw member 3. Is pulled into the main shaft 1 and the tool holder 2 is held between the main shaft 1 and the tool holder 2. Therefore, even if the expansion amount of the claw member 3 in each mechanism is reduced by expanding the claw member 3 in two stages by the locking mechanism and the clamping mechanism, the tool holder 2 is clamped by the claw member 3. The holding power can be improved.

  Further, the expansion member 6 as a locking mechanism and the locking advance / retreat member 9 as a clamping mechanism are both configured to operate by being retracted, that is, drawn into the main shaft 1 by a cam action. Therefore, the eccentric directions of the first eccentric cam portion 11 and the second eccentric cam portion 12 of the eccentric cam 13 can be set in the same phase direction, and the size can be reduced accordingly, and the eccentric cam 13 is transmitted. The acting force acts between the claw member 3 and the tool holder 2 more efficiently and can be firmly clamped accordingly.

  Therefore, in this embodiment, the tool holder can be firmly held by the claw member even if the operation amounts of the locking mechanism and the holding mechanism are reduced, and the size of the tool holder can be reduced while improving the connection force between the base member and the tool holder. Therefore, the holding device can be made extremely practical.

It is a schematic explanatory perspective view in which a part of the present embodiment is cut out. It is a schematic explanatory longitudinal cross-sectional view of a present Example. It is a schematic explanatory longitudinal cross-sectional view of a present Example. BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is a schematic explanatory longitudinal cross-sectional view of another example. It is a schematic explanatory longitudinal cross-sectional view of another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main axis | shaft 2 Tool holder 3 Claw member 5 Expanding part 6 Expanding member 9 Locking forward / backward member
11 First eccentric cam
12 Second eccentric cam
13 Eccentric cam
40 First piston part
41 Second piston part
42 1st cylinder
43 Second cylinder

Claims (8)

  A holding device for connecting a spindle of a machine tool and a tool holder fitted to the spindle, the holding device expanding a claw member for clamping the tool holder, and expanding the claw member. A locking mechanism for locking the tool holder to the tool holder, a clamping mechanism for clamping the tool holder by the claw member by pulling the claw member locked to the tool holder, and the locking mechanism and the clamping mechanism. An interlocking operation mechanism for operating the interlocking mechanism, and the interlocking operation mechanism includes an eccentric cam having a first eccentric cam portion for operating the locking mechanism and a second eccentric cam portion for operating the clamping mechanism, The first eccentric cam portion and the eccentric second cam portion rotate the eccentric cam to operate the locking mechanism by the first eccentric cam portion, and further rotate the eccentric cam to rotate the second eccentric cam. The above-mentioned clamping machine by the cam part There holding apparatus characterized by being configured to operate.   2. The holding device according to claim 1, wherein the eccentric cam is a pin body, the first eccentric cam portion and the second eccentric cam portion are provided on the pin body, and further, the first eccentric cam portion and the second eccentric cam portion. An eccentric direction of the cam portion with respect to the pin body axis is set in the same phase direction.   3. The holding device according to claim 2, wherein the first eccentric cam portion and the second eccentric cam portion are provided so as to partially overlap each other when viewed in the axial direction of the eccentric cam. .   A holding device for connecting a spindle of a machine tool and a tool holder fitted to the spindle, the holding device expanding a claw member for clamping the tool holder, and expanding the claw member. A locking mechanism for locking the tool holder to the tool holder, a clamping mechanism for clamping the tool holder by the claw member by pulling the claw member locked to the tool holder, and the locking mechanism and the clamping mechanism. An interlocking operation mechanism that operates in conjunction with each other, and this interlocking operation mechanism is provided in the first cylinder that is provided in the first cylinder and that operates the locking mechanism in response to introduction and withdrawal of fluid. A second piston portion that operates the clamping mechanism in response to introduction and extraction of the fluid, and a switching valve that can be sequentially controlled to operate the second piston portion after the first piston portion is operated. Has been Holding device, characterized in that.   A holding device for connecting a spindle of a machine tool and a tool holder fitted to the spindle, the holding device expanding a claw member for clamping the tool holder, and expanding the claw member. A locking mechanism for locking the tool holder to the tool holder, a clamping mechanism for clamping the tool holder by the claw member by pulling the claw member locked to the tool holder, and the locking mechanism and the clamping mechanism. A holding device having an interlocking operation mechanism for interlocking operation, and further provided with a coolant supply path.   The holding device according to any one of claims 1 to 5, wherein the tool holder is a cylindrical body, and the claw member is engaged and clamped on an inner surface of the tool holder. Holding device.   The holding device according to any one of claims 1 to 6, wherein the locking mechanism is provided on an inner side of the plurality of claw members, and has an expanding portion that expands the claw members by moving backward. The expansion member and a locked portion provided on the inner surface of the tool holder, and by retracting the expansion member, the claw member is expanded by the expansion portion, and the locked portion is A holding device configured to be locked.   8. The holding device according to claim 1, wherein the clamping mechanism includes a locking advance / retreat member that is locked to an outer position of the claw member and moves forward / backward, and retracts the locking advance / retreat member. Thus, the holding device is configured to retract the claw member that is expanded by the locking mechanism and locked to the tool holder.

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