JP2010240808A - Tool replacing device and tool pot of tool magazine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool replacing device of a tool magazine allowing a worker to pull out a tool by his/her power against spring force and moving a tool lock mechanism to a tool release position to set to an unclamp state or a clamp lock state preventing the tool from being pulled out. <P>SOLUTION: In this tool replacing device of the tool magazine including a plurality of tool pots 14 for receiving tools and a conveying member 16 to which a plurality of tool pots 14 are attached, a tool locking means has a slide pin 40 and a spring 42 for energizing the slide pin 40 toward a tool fixing position. A plurality of recessed parts 80 each storing a ball 36 are formed on an outer peripheral face of the slide pin 40, the recessed part 80 is formed into a substantially elliptical shape along the longitudinal direction of the slide pin 40, and a first cam face 81 and a second cam face 82 are formed in both of end parts in the longitudinal direction of the recessed part, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a tool replacement device for a tool magazine and a tool pot used in the device.

  In a machine tool such as a machining center, a tool magazine used in parallel with an automatic tool changer has a plurality of tool pots that detachably fix and support a tool, and a desired tool change position and a manual tool change position. A tool pot conveying member capable of indexing and positioning a tool pot is known.

  In this type of tool magazine, in order to place importance on safety, a tool lock mechanism is provided in each tool pot so that the tool is stably fixed and supported during tool conveyance. .

  In a tool magazine having a tool lock mechanism, a tool pot that needs to be replaced in response to a request for machining work of a machine tool is attached to and detached from the tool pot by a worker at a predetermined tool replacement position. Replacement has been made.

  That is, when the tool is mounted on the tool pot, the tool lock mechanism is forcibly released by pushing the tool into the receiving recess of the tool pot manually, and the tool is fixedly supported. Also, when removing the tool from the tool pot, insert a lever for manual operation between the contact surfaces of the tool and the tool pot, and forcibly activate the tool lock mechanism by lever action of the lever to release the tool. It was.

  In general, the tool locking mechanism fixes the tool by the force of a plunger or a spring that has been used, and when attaching or detaching the tool, an arm force that supports the tool and resists the spring force is required at the same time. .

  However, in a machine that requires a heavy tool, it is necessary to design the tool so that the tool cannot be pulled out unless a very strong force is used for safety. Therefore, when it is necessary to change the tool manually, it is necessary to provide a mechanism that prevents the plunger and the spring force from being applied.

  Therefore, for example, in Japanese Patent Application Laid-Open No. 11-48073 (Patent Document 1), when a tool is replaced, an operator operates a stepping type actuating means with a foot to actuate a driving means, and a tool lock mechanism is attached to a tool Devices have been proposed that can be moved to the release position.

  However, when a tool having a very large weight is required, for the sake of safety, it is necessary to provide a lock mechanism that cannot be pulled out by the above method.

JP 11-48073 A

  The present invention has been made to solve the above-mentioned problems, and it is possible to pull out a tool manually against the spring force. Further, by operating the driving means, the tool lock mechanism is moved to the tool release position. Another object of the present invention is to provide a tool changer for a tool magazine and a tool pot that can be brought into an unclamped state and can be brought into a clamp locked state in which a tool cannot be pulled out by a normal method.

  A tool changer for a tool magazine according to the present invention is a tool changer for a tool magazine having a plurality of tool pots for receiving tools and a conveying member to which the tool pots are attached. A tool locking means for detachably fixing and supporting the tool received in the tool pot; a driving means for moving the tool locking means of the tool pot from a tool fixing position to a tool releasing position; and Actuating means for actuating, wherein the tool locking means is supported by the tool pot so as to be movable in the axial direction of the tool between the tool fixing position and the tool releasing position, and the slide A spring for biasing the pin toward the tool fixing position, and the driving means acts on the slide pin, and the slide pin is moved from the tool fixing position against the bias of the spring. A plurality of recesses are formed on the outer peripheral surface of the slide pin to accommodate the ball, and the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin. The first cam surface and the second cam surface are formed at both ends of the inner surface of the tool pot, and when the slide pin is moved in the axial direction, the cam surface presses the ball, A ball protrudes from a hole formed in the cylinder, thereby achieving the above object.

  In one embodiment, the ball may contact the first cam surface or the second cam surface of the recess.

  In one embodiment, the driving means includes a pneumatic actuator supported by a frame body of a tool magazine and a pneumatic circuit connected to the actuator, and an operator operates the operating means of the driving means. The piston of the actuator of the driving means moves forward to move the slide pin to the tool release position against the bias of the spring provided in the tool lock mechanism of the tool pot.

  In one embodiment, the driving means includes a pneumatic actuator supported by a frame body of a tool magazine and a pneumatic circuit connected to the actuator, and an operator operates the operating means of the driving means. The piston of the actuator of the drive means moves forward and moves to a position where the tool lock mechanism of the tool pot is locked.

  The tool pot of the present invention is a tool pot used in the tool replacement device for the tool magazine, and the tool pot is a hollow cylindrical outer cylinder and an inner cylinder disposed and fixed in the outer cylinder. A cylinder, a plurality of balls held by the inner cylinder, a slide pin disposed in the inner cylinder and moving in the axial direction and having a tapered cam surface, and a spring for biasing the slide pin rearward , And a plurality of recesses for receiving the ball are formed on the outer peripheral surface of the slide pin, the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin, and are formed at both ends in the longitudinal direction of the recess. 1 cam surface and second cam surface are formed, respectively, and when the slide pin is moved in the axial direction, the cam surface presses the ball so that the ball protrudes from the hole formed in the inner cylinder, This achieves the above object.

  The present invention has the following effects.

  Tool locking means for detachably fixing and supporting the tool received in the tool pot, driving means for moving the tool locking means of the tool pot from the tool fixing position to the tool releasing position, and operating means for operating the driving means A slide pin supported by the tool pot so as to be movable in the axial direction of the tool between a tool fixing position and a tool releasing position, and directing the slide pin to the tool fixing position. And a biasing spring, wherein the driving means acts on the slide pin and moves the slide pin from the tool fixing position to the tool releasing position against the bias of the spring. Thus, when the drive means is not operated, the tool can be clamped by the spring force. Therefore, when handling a lightweight tool, the tool can be attached to and detached from the tool pot by human power.

  Further, when handling a heavy tool, the slide pin can be moved from the tool fixing position to the tool releasing position against the bias of the spring by operating the driving means. Therefore, the operator can always handle the tool easily.

  Further, in the present invention, a plurality of recesses for accommodating the ball are formed on the outer peripheral surface of the slide pin, the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin, and the first is formed at both ends in the longitudinal direction of the recess. The cam surface and the second cam surface are respectively formed, and when the slide pin is moved in the axial direction, the cam surface presses the ball so that the ball protrudes from the hole formed in the inner cylinder of the tool pot. By doing so, the ball can be placed on the first cam surface of the slide pin or the second cam surface can be placed.

  When the ball is arranged on the second cam surface of the slide pin, as described above, the slide pin can be moved from the tool fixing position to the tool release position when the driving means acts on the slide pin. When the ball is arranged on one cam surface, the slide pin can be clamped at the tool fixing position when the driving means acts on the slide pin, so that a clamp lock state in which the tool cannot be pulled out is obtained.

FIG. 3 is a partial cross-sectional enlarged schematic view showing a tool replacement device according to an embodiment of the present invention together with a tool magazine, and is a cross-sectional view taken along the line II in FIG. 2. FIG. 2 is an overall front view of a tool magazine to which the tool replacement device of FIG. 1 can be applied. It is a perspective view of the state where the slide pin was inserted in the inner cylinder. It is a perspective view of a slide pin. It is sectional drawing of a slide pin. It is explanatory drawing which shows operation of a slide pin. It is explanatory drawing which shows operation of a slide pin, and shows the state in which the ball | bowl is riding on the 1st cam surface. It is explanatory drawing which shows operation of a slide pin, and shows the state in which the ball | bowl is riding on the 2nd cam surface.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings.

  FIG. 1 is an enlarged partial cross-sectional view of a tool magazine 12 to which a tool replacement device 10 according to an embodiment of the present invention is applied.

  As shown in FIG. 2, the tool magazine 12 includes a plurality of tool pots 14 that detachably fix and support a tool and a transport member 16 that transports the tool pots 14 by attaching a plurality of the tool pots 14. Attached with automatic tool changer.

  The conveying member 16 has an endless chain and a sprocket, and a large number of tool pots 14 are attached, and a desired tool pot 14 can be indexed and positioned at a predetermined tool manual replacement position 18 and a tool replacement position 20.

  Each tool pot 14 attached to the conveyance member 16 includes a tool lock mechanism 22 for stably fixing and supporting the tool during the conveyance of the tool.

  As shown in FIG. 1, the tool pot 14 includes a cup-shaped outer cylinder 28 in which a receiving recess 26 for receiving a tool 24 is provided on one end side in the axial direction. The tool locking mechanism 22 is installed in the outer cylinder 28 so as to be movable between a first position where the tool 24 is fixed to the receiving recess 26 and a second position where the tool 24 is released.

  The tool lock mechanism 22 includes a plurality of inner cylinders 30 that are fixed to the receiving recesses 26 of the outer cylinder 28 so as to be substantially concentric apart from the inner peripheral surface of the outer cylinder 28, and a plurality of holes that are formed through the peripheral wall 32 of the inner cylinder 30 in the radial direction. A ball 36 made of a hard material accommodated in the hole 34, a slide pin 40 that is concentrically penetrated in the inner cylinder 30 in the axial direction and is slidably supported by the inner cylinder 30, and the slide pin 40 is allowed to move freely. The end portion 38 includes a spring 42 that urges the end portion 38 in a direction in which the end portion 38 is pulled inside the peripheral wall 32 of the inner cylinder 30.

  Each ball holding hole 34 is formed such that the outer diameter of each ball holding hole 34 is slightly smaller than the diameter of the ball 36 in order to prevent the balls 36 from jumping out from the outer periphery of the peripheral wall 30 a and falling off.

  Due to the tension bias of the spring 42, the ball 36 receives a component force of the spring force (hereinafter simply referred to as a spring force) from the tapered outer peripheral surface portion 44 of the slide pin 40, and radially outwards in the ball holding hole 34. And is held in a state of partially protruding from the outer surface of the peripheral wall 32.

  In this state, the ball 36 engages with the tool 24 inserted into the receiving recess 26 as will be described later, and acts to fix the tool 24.

  Therefore, in this embodiment, the position where the ball 36 receives a spring force from the slide pin 40 and partially protrudes from the outer surface of the peripheral wall 32 of the inner cylinder 30 (the position shown in the figure) is the tool lock mechanism 22 (ie, the ball 36 and the ball 36). The first position of the slide pin 40), where the ball 36 is pushed into the ball holding hole 34 of the peripheral wall 32 of the inner cylinder 30 against the spring force from the slide pin 40, and does not substantially protrude from the outer surface of the peripheral wall 32. Is the second position of the tool lock mechanism 22.

  The tool 24 received in the tool pot 14 provided with such a tool lock mechanism 22 has a hollow cylindrical engagement that can be engaged with the tool lock mechanism 22 at the rear end on the opposite side of the blade (not shown). A portion 46 is provided.

  The engaging portion 46 includes a thick portion 48 at the distal end and a thin portion 50 at the proximal end, and a tapered inner peripheral surface portion 52 is formed between the inner peripheral surfaces of both portions. The thick portion 48 of the engaging portion 46 is smaller than the radial distance between the outer cylinder 28 and the inner cylinder 30 of the tool pot 14, but the diameter between the ball 36 and the outer cylinder 28 in the first position. The thickness is greater than the directional distance.

  The ball 36 has a diameter larger than the thickness of the peripheral wall 32 of the inner cylinder 30, and a part of the ball 36 protrudes from the inner surface side of the peripheral wall 32 and always contacts the tapered outer peripheral surface portion 44 reaching the free end portion 38 of the slide pin 40. To do.

  When the tool 24 is mounted on the tool pot 14, conventionally, a procedure that relies on the arm strength of the operator as described below has been performed.

  That is, the engaging portion 46 at the rear end of the tool 24 is pushed into the space between the outer cylinder 28 and the inner cylinder 30 of the receiving recess 26, and the ball 36 is inserted into the peripheral wall 32 of the inner cylinder 30 by the thick portion 48 of the engaging portion 46. Pressure is applied to the taper outer peripheral surface portion 44 of the slide pin 40 by pressing inward in the radial direction of the slide pin 40, and the pressure causes the slide pin 40 to resist the bias of the spring 42 from the first position to the second position. The ball 36 is moved from the first position to the second position, and the engaging portion 46 is advanced to a predetermined depth of the receiving recess 26.

  When the engaging portion 46 of the tool 24 reaches a predetermined depth of the receiving recess 26, the ball 36 gets over the thick portion 48 of the engaging portion 46 and reaches the tapered inner peripheral surface portion 52. Since it is released from pressing inward in the direction, it receives the spring force from the slide pin 40 and returns to the first position partially protruding from the outer surface of the peripheral wall 32.

  In this state, under the bias of the spring 42, the ball 36 is brought into contact with both the tapered outer peripheral surface portion 44 of the slide pin 40 and the tapered inner peripheral surface portion 52 of the engaging portion 46 to receive the tool 24. Fix in the recess 26. In this state, the end surface 53 of the tool pot 14 and the end surface 54 of the tool 24 are in close contact with each other.

  When the tool 24 is detached from the tool pot 14, a lever (not shown) for manual operation is inserted between both end surfaces 53 and 54 in close contact with the tool 24 and the tool pot 14, and the lever action force of the lever. Is transmitted from the taper surface inner peripheral portion 52 of the engaging portion 46 to the taper outer peripheral surface portion 44 of the slide pin 40 via the ball 36, and the tool lock mechanism 22 is moved against the spring force in the same manner as in the above mounting. The tool 24 is detached by moving the position from the position to the second position.

  In the present invention, in order to reduce the physical burden of the conventional tool replacement work that relies on the arm strength of the operator, the tool replacement device 10 is installed at the tool replacement position 18 of the conveying member 16 of the tool magazine 12. It is.

  As shown in FIG. 1, the tool changer 10 is installed so as to be aligned with a desired tool pot 14 indexed and positioned at the tool change position 18 (FIG. 2), and the tool lock mechanism 22 of the tool pot 14 is described above. A driving unit 56 that forcibly moves from the first position to the second position and an operating unit (for example, a stepping type) 58 that operates the driving unit 56 are provided.

  The driving unit 56 includes a pneumatic actuator 62 supported by the frame body 60 of the tool magazine 12 and a pneumatic circuit 64 connected to the actuator 62. The actuator 62 has a known piston / cylinder structure, and the tip 68 of the piston 66 projects from the rear end of the outer cylinder 28 of the tool pot 14 positioned at the tool replacement position 18 (FIG. 2). The rear end 70 is arranged so as to be in contact with the rear end 70.

  The pneumatic circuit 64 includes a switching valve such as a solenoid valve that switches and connects the actuator 62 to the atmospheric pressure line and the pneumatic pressure source line in the manifold.

  The foot-operated actuating means 58 controls the switching of the switching valve to selectively move the piston 66 of the actuator 62 forward and backward. The foot-operated actuating means 58 can be composed of, for example, a foot pedal and a limit switch.

  The inner cylinder 30 is made of metal and has a small-diameter and hollow peripheral wall 32 protruding to the front end side. The outer peripheral surface of the peripheral wall 32 forms a guide surface for guiding the engaging hole 4 of the tool holder 1. Yes. The peripheral wall 32 is formed with a plurality of ball holding holes 34 for holding each ball 36 penetrating in the radial direction. Each ball holding hole 34 is formed so that the outer diameter of each ball holding hole 34 is slightly smaller than the diameter of the ball 36 in order to prevent each ball 36 from jumping out of the outer periphery of the peripheral wall 32 and falling off.

  The slide pin 40 is formed in a cylindrical shape, and a plurality of recesses 80 for accommodating the balls 36 are formed on the outer peripheral surface thereof. In this embodiment, three recesses 80 are formed around the slide pin 40 main body. The concave portion 80 is formed in a substantially elliptical shape (including a substantially rectangular shape) along the longitudinal direction of the slide pin 40. As shown in FIG. 6, the recess 80 has cam surfaces 81 and 82 formed at both ends in the longitudinal direction, and an accommodating portion 84 formed at the center. The circumferential surface of the housing portion 84 and the cam surfaces 81 and 82 constitute a tapered outer circumferential surface portion 44.

  Therefore, when the slide pin 40 is moved in the axial direction, the cam surfaces 81 and 82 press the ball 36, whereby the ball 36 is pushed radially outward, and the ball holding formed on the inner cylinder 30 is held. The ball 36 is configured to protrude from the hole.

The effect | action of the tool replacement apparatus 10 which has such a structure is demonstrated below.
(1) In the present invention, as described above, the following (2) clamp state and (3) clamp lock state are possible in addition to the unclamped state where the tool can be pulled out manually by the action of the spring force. It is.

  First, the above (2) will be described.

  After the desired tool pot 14 is positioned at the tool replacement position 18 (FIG. 2), when the operator operates the stepping type actuating means 58 with his / her foot and turns on the limit switch via the foot pedal, for example, the switching valve is actuated by the actuator. 62 is connected to an air pressure source to advance the piston 66 at a predetermined pressure.

  As a result, the tip 68 of the piston 66 is brought into contact with the rear end 70 of the slide pin 40 of the tool pot 14, and the slide pin 40 is moved from the first position to the second position against the bias of the spring 42. . Thereby, the spring force applied to the ball 36 is released.

  In this state, the ball 36 can freely move in the radial direction within the ball holding hole 34 of the peripheral wall 32 of the inner cylinder 30 (FIG. 6), so that the operator can use both hands when attaching the tool 24 to the tool pot 14. The engaging portion 46 of the tool 24 can be inserted into the receiving recess 26 of the tool pot 14 without resistance while supporting the tool 24, or when the tool 24 is detached from the tool pot 14, the tool 24 is still used with both hands. The tool 24 received in the receiving recess 26 can be pulled out without resistance.

  In this way, the operator can attach and detach the tool 24 to and from the tool pot 14 with both hands and with a force that only substantially supports the tool 24.

  Thereafter, when the operator removes his / her foot from the stepping type actuating means 58, the switching valve connects the actuator 62 to the atmospheric pressure to retract the piston 66, and the spring 42 biases the slide pin 40 from the second position. Returning to the first position (in the direction of arrow A in FIG. 8), the ball 36 is held at the first position under the spring force (FIG. 8).

  When the tool 24 is mounted, the tool 24 is stably fixed to the tool pot 14 as described above.

  The tool replacement device 10 functions effectively both when the tool 24 is mounted on the tool pot 14 and when the tool 24 is detached from the tool pot 14, but particularly when the tool 24 is detached. Is extremely effective because it eliminates the need to use a conventional manual lever.

  Next, the above (3) normal method (clamp lock state in which the tool cannot be pulled out) will be described.

  The concave portion 80 formed in the slide pin 40 includes a first cam surface 81, a second cam surface 82, and a housing portion 84.

  As shown in FIG. 8, when the ball 36 is positioned on the second cam surface 82, the action is performed as described in the above (2).

  Further, when the driving means 56 is operated to move the slide piston 40 in the direction opposite to the arrow A in FIG. 8, the ball 36 rides on the first cam surface 81, and as shown in FIG. It will be in the state which protrudes from the pipe | tube 30 (3rd position).

  In this state, since the ball 36 cannot move in the radial direction within the ball holding hole 34 of the peripheral wall 32 of the inner cylinder 30, the tool 24 is securely fixed to the tool pot 14.

  When removing the tool 24 from the tool pot 14, the operator removes his foot from the stepping type actuating means 58 so that the switching valve connects the actuator 62 to the atmospheric pressure and retracts the piston 66 (FIG. 8). As described in (1) above, the tool can be attached and detached manually.

  As described above, according to the tool replacement device 10, when performing the replacement operation of the tool 24 with respect to the desired tool pot 14 of the tool magazine 12, the operator can always With the tool 24 held with both hands, the tool locking state of the tool lock mechanism 22 can be released by a stepping operation. Therefore, especially when handling a heavy tool, the labor of the operator can be reduced and work errors due to fatigue can be reduced. Generation and adverse effects on the body can be reduced.

  Furthermore, in the case of a large tool, it can be securely fixed to the tool pot.

  The drive means 56 of the tool changer 10 is not limited to the pneumatic drive mechanism described above, and other known drive mechanisms such as a hydraulic type, an electric type, a magnetic type, and a mechanical type can be employed. In the above embodiment, while the operator is stepping on the stepping type actuating means 58, the actuator 62 continues to operate and maintains the state where the tool lock mechanism 22 is moved to the second position. However, the present invention is not limited to this. For example, the switching valve is switched every time the stepping-type operating means 58 is stepped on, and the valve position once switched even when the foot is released, that is, the position of the piston 66 does not change. It is also possible to adopt a configuration in which the actuator 62 is actuated (piston advance) by stepping on and then the switching valve is switched after a predetermined time has elapsed to automatically stop the actuator 62 (piston reverse).

14 Tool pot 16 Conveying member 24 Tool 28 Outer cylinder 30 Inner cylinder 34 Hole 36 Ball 40 Slide pin

Claims (6)

A tool changer for a tool magazine having a plurality of tool pots for receiving tools and a conveying member to which the plurality of tool pots are attached,
Tool locking means provided in the tool pot and removably fixing and supporting the tool received in the tool pot; and drive means for moving the tool locking means of the tool pot from a tool fixing position to a tool releasing position. Operating means for operating the driving means,
The tool locking means includes a slide pin supported by the tool pot so as to be movable in the axial direction of the tool between the tool fixing position and the tool releasing position, and the slide pin is attached to the tool fixing position. A biasing spring, the drive means acting on the slide pin and configured to move the slide pin from the tool locking position to the tool release position against biasing of the spring;
A plurality of recesses for receiving balls are formed on the outer peripheral surface of the slide pin, the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin, and the first cam surface and the first cam are formed at both ends in the longitudinal direction of the recess. When the two cam surfaces are formed and the slide pin is moved in the axial direction, the cam surface presses the ball so that the ball protrudes from the hole formed in the inner cylinder provided in the tool pot. Tool changer for tool magazines. The tool replacement device for a tool magazine according to claim 1, wherein the ball can contact the first cam surface or the second cam surface of the recess. The driving means includes a pneumatic actuator supported by a frame body of the tool magazine and a pneumatic circuit connected to the actuator. When an operator operates the operating means of the driving means, the actuator of the driving means 2. The tool changer for a tool magazine according to claim 1, wherein the piston moves forward to move the slide pin to the tool release position against the bias of the spring provided in the tool lock mechanism of the tool pot. . The driving means includes a pneumatic actuator supported by a frame body of the tool magazine and a pneumatic circuit connected to the actuator. When an operator operates the operating means of the driving means, the actuator of the driving means The tool replacement device for a tool magazine according to claim 1, wherein the piston moves forward to a position where the tool lock mechanism of the tool pot is locked. A tool pot used in the tool replacement device for the tool magazine according to claim 1,
The tool pot includes a hollow cylindrical outer cylinder, an inner cylinder disposed and fixed in the outer cylinder, a plurality of balls held in the inner cylinder, and an inner cylinder disposed in the inner cylinder. A slide pin that moves in the axial direction and has a tapered cam surface, and a spring that biases the slide pin rearward,
A plurality of recesses for receiving balls are formed on the outer peripheral surface of the slide pin, the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin, and the first cam surface and the first cam are formed at both ends in the longitudinal direction of the recess. A tool pot in which two cam surfaces are formed, and when the slide pin is moved in the axial direction, the cam surface presses the ball so that the ball protrudes from a hole formed in the inner cylinder. A tool pot used for a tool changer for a tool magazine,
A hollow cylindrical outer cylinder, an inner cylinder disposed and fixed in the outer cylinder, a plurality of balls held in the inner cylinder, and disposed in the inner cylinder and moving in the axial direction A slide pin having a tapered cam surface, and a spring for biasing the slide pin rearward,
A plurality of recesses for receiving balls are formed on the outer peripheral surface of the slide pin, the recesses are formed in an approximately elliptical shape along the longitudinal direction of the slide pin, and the first cam surface and the first cam are formed at both ends in the longitudinal direction of the recess. A tool pot in which two cam surfaces are formed, and when the slide pin is moved in the axial direction, the cam surface presses the ball so that the ball protrudes from a hole formed in the inner cylinder.

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