JP2010179415A - Tool exchange mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool exchange mechanism with improved appearance. <P>SOLUTION: The tool exchange mechanism 31 includes a locking mechanism 41 provided on a body 21 for locking a tool part 12. The locking mechanism 41 includes a body-side housing 24 for surrounding a driving shaft 25, an inner cylinder 37 provided to be axially slidable on the driving shaft 25 on an internal surface of the body-side housing 24, and a locking member 38 rotated by the advance/retreat of the inner cylinder 37. The tool part 12 includes a tool housing 13 for surrounding a driven shaft 44 and a hook 86 provided on an internal surface of the tool housing 13 and locked by the locking member, to position the mechanism at a locked position where the locking member 38 engages with the hook 86 or a release position where the locking member 38 disengages from the hook 86. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a tool changing mechanism.

  2. Description of the Related Art Conventionally, a tool changing mechanism is known in which a claw piece that allows a tool part (head) to be attached and detached is provided at the tip of a quill as a tool holding part disposed around a drive shaft (for example, Patent Document 1). (See FIG. 1).

Patent document 1 is demonstrated based on the following figure.
FIG. 10 is a diagram for explaining the basic configuration of the conventional technique. In the main body 200 (element names and symbols have been reassigned, the same shall apply hereinafter), the drive shaft 201 and the drive shaft 201 are driven around the drive shaft 201. A quill 202 that supports the shaft 201 and is capable of moving back and forth is provided, and a tool changing mechanism 206 that detachably holds the tool portion 203 is provided at the tip of the quill 202.
A claw piece 207 for detachably holding the tool portion 203 is provided on the outer periphery of the tool exchange mechanism 206.

  However, in the technique of Patent Document 1, the claw piece 207 is disposed so as to be exposed. For this reason, there is room for improvement in the appearance of the tool exchange mechanism 206.

Japanese Utility Model Publication No.59-20920

  An object of the present invention is to provide a tool exchange mechanism with improved appearance.

  According to the first aspect of the present invention, there is provided a main body having a drive shaft for transmitting a driving force, a driven shaft detachably provided on the main body and driven by being engaged with the drive shaft, and driven by the driven shaft. A tool change mechanism comprising a tool part having a tool to be provided, and a locking mechanism for locking the tool part is provided in the main body part, and the locking mechanism includes a first housing surrounding the drive shaft, and the first An inner cylinder part provided on the inner surface of the housing so as to be slidable in the axial direction of the drive shaft, and a locking member that is rotated by the advancement and retraction of the inner cylinder part are provided, and the tool part is provided around the driven shaft. A second housing that surrounds the second housing, and a hooking portion that is provided on the inner surface of the second housing and is locked by the locking member. The locking position where the locking member is hooked to the hooking portion, or the locking member is hooked To be in a release position that comes off the part And features.

  The invention according to claim 2 is characterized in that the inner cylinder portion is provided with a recess that engages with the locking member and rotates the locking member.

  According to a third aspect of the present invention, an elastic member is provided between the first housing and the inner cylindrical portion so that the locking member biases the inner cylindrical portion toward the locking position at the hooking portion. It is characterized by.

In the invention according to claim 1, the locking mechanism includes a locking member provided in the first housing and a hook portion provided on the inner surface of the second housing so as to engage with the locking member. I have.
Then, the hook portion was engaged with the locking member, and the tool portion was mounted on the main body portion. With such a structure, the locking mechanism including the locking member is covered with the second housing after the tool portion is mounted on the main body, so that the locking mechanism is not exposed and the appearance of the tool replacement mechanism is improved. Can be increased.

In the invention which concerns on Claim 2, the recessed part which engages with a locking member and rotates a locking member is provided in the inner cylinder part.
The locking member is rotated by the recess. The locking mechanism can be configured with a simple configuration of the concave portion of the inner cylindrical portion, the locking member, and the inner cylindrical portion that drives the locking member. Therefore, the device cost can be reduced.

  In the invention which concerns on Claim 3, the elastic member is provided between the 1st housing and the inner cylinder part. The elastic member urges the inner cylinder portion toward the locking position, and accordingly, the locking member is urged toward the locking position. Even when the inner cylinder portion is not under pressure by a medium such as compressed air, for example, the locking member is biased toward the locking position, so there is no need to apply force to the inner cylinder portion. . Therefore, it is not necessary to apply a force to the inner cylinder portion, and the energy consumption of the apparatus can be reduced.

It is a front view of the nut runner concerning the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is principal part sectional drawing of the tool exchange mechanism with which the nut runner concerning this invention is equipped. FIG. 5 is an operation explanatory diagram of FIG. 4. It is sectional drawing of the shaft moving mechanism with which the nut runner which concerns on this invention is equipped. FIG. 7 is an operation explanatory diagram of FIG. 6. It is action explanatory drawing (when fastening a bolt) of the nut runner concerning the present invention. It is action | operation explanatory drawing (when removing a tool part from a main-body part) of the nut runner which concerns on this invention. It is a figure explaining the basic composition of the conventional technology.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “upper”, “lower”, “front”, “rear”, “left”, and “right” respectively indicate directions when the apparatus is viewed from the rear. The drawings are viewed in the direction of the reference numerals.

  In FIG. 1, a nut runner 10 according to the present invention is provided with a tool portion 12 having rotating shafts 11L and 11R for rotating bolts or nuts.

The tool portion 12 includes a tool housing 13 that houses a drive transmission unit that transmits a driving force to the rotary shaft 11, and is disposed on the left and right sides of the upper surface of the tool housing 13 and extends upward to extend and contract the rotary shafts 11L and 11R up and down. The left cylinder 14L and the right cylinder 14R, the left rotary shaft 11L and the right rotary shaft 11R extending downward from the lower surface of the tool portion 12, and the lower portions of the left rotary shaft 11L and the right rotary shaft 11R are made possible. The left outer cylinder portion 15L and the right outer cylinder portion 15R to be supported, and the left socket portion 16L and the right socket as the tool portion 12 which are respectively attached to the distal ends of the left rotation shaft 11L and the right rotation shaft 11R and are fitted with bolts or nuts. Compressed air supply for supplying compressed air provided at the upper and lower portions of the portion 16R, the left cylinder portion 14L and the right cylinder portion 14R 17H, 17L, includes 17H, and 17L, these compressed air supply port 17H, 17L, 17H, lift air supply joint 18H attached to 17L, 18L, 18H, and 18L, the.
In addition, the left socket part and the right socket part are one form of tools, and may be replaced with other tools such as a drill, a tapping tool, and a reamer.

In FIG. 2, a main body portion 21 that supports a tool portion 12 as a constituent member of the nut runner 10 is shown.
In the figure, reference numerals 33L and 33R denote compressed air supply ports for supplying compressed air to the tool changing mechanism 31.
In the present embodiment, the air motor 34 is used as the driving source, but other driving means such as an electric motor and a hydraulic motor may be used.

  In FIG. 3, the main body portion 21 includes a base portion 22, a drive source 23 attached to the upper surface of the base portion 22, a main body side housing 24 attached to the base portion 22, and the main body side housing 24 from the drive source 23. And a drive shaft 25 that extends and transmits a driving force.

  The main body portion 21 and the tool portion 12 are provided with a tool changing mechanism 31. The tool exchange mechanism 31 is configured to detachably lock or hold the tool part 12 to the main body part 21.

Hereinafter, the internal structure of the main body part 21 and the tool part 12 will be described.
The main body 21 is provided with a main body side housing 24 surrounding the drive shaft 25 supported by the base 22 and extending from the drive source 23, and slidable in the axial direction of the drive shaft 25 on the inner surface of the main body side housing 24. And an engaging member 38 that rotates as the inner cylinder part 37 advances and retreats. The locking member 38 is a member constituting a locking mechanism 41 that locks the tool portion 12.

The tool portion 12 includes a tool housing 13, a driven shaft 44 that has an engaging portion 43 that is supported by the tool housing 13 and engages with the drive shaft 25, and to which a driving force is transmitted, and the driven shaft 44 and the tool housing. 13, a first bearing 47 that supports one end 45 of the driven shaft, a second bearing 48 that supports the other end 46 of the driven shaft, and between the first bearing 47 and the second bearing 48. A first gear 51 that is arranged and rotates integrally with the driven shaft 44, a second gear 52 that meshes at right angles with the first gear 51 and that is disposed horizontally, and rotates integrally attached to the lower end of the second gear 52. A third gear 53 that enables transmission of driving force to the shaft 11L, and a third bearing 49 that rotatably supports the second gear 52 and the third gear 53 from below are provided. The periphery of the driven shaft 44 is surrounded by the tool housing 13.
The second gear 52 and the third gear 53 are bevel gears.

  In the figure, 57 is a front wall portion provided at the front end portion of the tool portion 12 and supports the first bearing 47, 58 is provided at the rear end portion of the main body portion 21, and between the vertical wall 22V of the base portion 22 and the main body portion 21. And a rear wall portion having an opening 56 through which the drive shaft 25 passes.

In FIG. 4, the inner cylinder portion 37 has an outer periphery 61 supported by a first sliding portion 63 provided on the inner peripheral surface of the main body side housing 24, and is attached to the inner peripheral surface of the main body side housing 24. It is supported by a holding member 65 that constitutes the second sliding portion 64, and is arranged to be slidable back and forth. In addition, a space 67 is formed between the inner cylindrical portion 37 and the main body side housing 24 and between the first sliding portion 63 and the second sliding portion 64, and the inner cylindrical portion 37 is formed in the space 67. A partition wall 71 that divides the space 67 left and right is extended outward, and a first hole 73 through which compressed air passes through the front end portion of the space 67 is opened in the main body side housing 24, and compression is performed at the rear end portion of the space 67. A second hole 74 through which air passes is opened. The space 67 is partitioned by the partition wall 71 into one chamber 157 and the other chamber 158.
Between the inner cylinder part 37 and the rear wall part 58, a spring 78 is interposed as an elastic member that urges the inner cylinder part 37 in a direction away from the rear wall part 58.

Hereinafter, the locking mechanism 41 that detachably holds the tool housing 13 to the main body side housing 24 will be described in detail.
A support piece 81 extends forward from the front end portion of the main body-side housing 24, and a cam support shaft 82 is provided on the support piece 81. The cam support shaft 82 is rotatable as a form of cam. A member 38 is provided. The locking member 38 is provided with a first protrusion 84 that engages with a recess 83 provided in the inner cylinder portion 37 at one end with the cam support shaft 82 interposed therebetween, and is provided on the inner surface of the tool housing 13 at the other end. A second projecting piece 85 that engages with a hooking portion 86 as a concave portion is provided. As the locking member 38 is advanced and retracted, the first protrusion 84 is pushed by the recess 83 provided in the inner cylinder portion 37, and the locking member 38 is rotated about the cam support shaft 82. The two projecting pieces 85 are members that can be engaged with a hooking portion 86 formed on the inner surface of the tool housing 13.

That is, the inner cylinder portion 37 is provided with a recess 83 that engages with the locking member 38 and rotates the locking member 38, and the hooking portion 86 provided on the inner surface 87 of the tool housing by the locking member 38. Can be locked.
The locking position where the locking member 38 is hooked on the hooking portion 86 or the unlocking position where the locking member 38 is released from the hooking portion 86 by the advancement and retraction of the inner cylinder portion 37 is set.

In the figure, 111 is a first seal provided on the partition wall 71, 112 is a second seal that seals the front end of the space 67, and 113 a and 113 b are fitted into the inner and outer surfaces of the holding member 65 to seal the rear end of the space 67. A third seal 114 is a clip member that is fixed to the main body side housing 24 of the holding member 65.
Returning to FIG. 3, reference numeral 115 denotes a first joint member that connects to the tube that is attached to the first hole 73 and supplies compressed air, and 116 denotes a second joint that connects to the tube that is attached to the second hole 74 and supplies compressed air. It is a member. Note that the second joint member 116 may be omitted.

In FIG. 5A, the locking member 38 provided on the main body side housing 24 engages with the hook portion 86 of the tool housing 13, and the tool housing 13 is held by the main body side housing 24. At this time, the inner cylinder part 37 is urged in the direction of arrow A by the spring 78, and is placed in a locking position where the locking member 38 is hooked on the hooking part 86.
Between the main body side housing 24 and the inner cylinder part 37, a spring 78 is provided as an elastic member that biases the inner cylinder part 37 to the hooking part 86 on the hooking part 86.

Since the spring 78 is provided between the main body side housing 24 and the inner cylinder part 37, even when the inner cylinder part 37 is not pressurized by the medium, the locking member 38 is located on the locking position side. Therefore, it is not necessary to apply a force to the inner cylinder portion 37, and the energy consumption of the apparatus can be reduced.
The elastic member is not limited to a spring, and any member can be selected as long as it has elasticity such as resin, rubber, air cushion unit, and the like.

  In FIG. 5B, compressed air is supplied to the first hole 73 in the direction of arrow b 1, and the inner cylinder part 37 is moved in the direction of arrow B against the spring 78, and is provided on the outer periphery of the inner cylinder part 37. The locking member 38 is rotated in the direction of the arrow b2 by the recess, and the engagement with the hooking portion 86 is released. At this time, the locking member 38 is in a release position where it is disengaged from the hooking portion 86.

  Such a locking mechanism 41 has a simple configuration of a locking member 38 and an inner cylinder portion 37 that drives the locking member 38. Therefore, the device cost of the tool exchange mechanism can be reduced.

In FIG. 5C, the tool housing 13 is moved from the main body side housing 24 in the direction of arrow C while the locking mechanism 41 remains in the position of FIG.
Contrary to the above operation, when attaching the tool housing 13 to the main body side housing 24, compressed air is supplied to the first hole 73, the inner cylinder part 37 is moved against the spring 78 to the rear of the apparatus, and locked. With the second projecting piece 85 of the member 38 facing the front of the apparatus, the tool housing 13 is attached to the main body side housing 24, and the first hole 73 is opened to the outside air.

Hereinafter, the details of the shaft movement mechanism and the shaft rotation mechanism of the nut runner will be described.
6, the nut runner 10 indicates the shaft moving mechanism and the shaft rotating mechanism for one rotating shaft 11 among the plurality of rotating shafts 11..., And the right rotation shown in FIG. This corresponds to the shaft 11R. Since the structure of the other rotating shaft has the same structure, description is abbreviate | omitted. In the following description, “rotating shaft 11R” is replaced with “rotating shaft 11”.

  The nut runner 10 constituting the tool portion 12 includes a driven shaft 44 to which a driving force is supplied by a driving source (reference numeral 23 in FIG. 2), a first gear 51 attached to the driven shaft 44, and the first gear 51. A second gear 52 meshed at right angles with the second gear 52, a third gear 53 provided below the second gear 52 and rotating integrally with the second gear 52, and a third gear 53 rotatably supporting the third gear 53. A bearing 49, a rotational force transmission gear 123 that meshes with the third gear 53, a lower bearing 124 that rotatably supports the rotational force transmission gear 123, a through hole 125 that is opened in the axial direction of the rotational force transmission gear 123, The rotating shaft 11 provided so as to penetrate the through hole 125, the rotating flange 127 provided on the rotating shaft 11 and rotating together with the rotating shaft 11, and the rotating shaft disposed above the rotating flange 127. 1 is rotatably supported, a piston portion 131 that supports the upper bearing 128 from above and from the outside, a stop member 132 that stops the piston portion 131 on the rotating shaft 11, and a sliding piston portion 131. And a cylinder part 133 that is freely supported.

  A plurality of engagement holes 135 (... indicates a plurality; the same applies hereinafter) are formed in the circumferential direction of the upper surface of the rotational force transmission gear 123 as a rotational force transmission portion. A plurality of engagement pins 136... As engagement means that can be engaged with.

  That is, the clutch mechanism 141 includes a rotational force transmission gear 123, an engagement hole 135 formed in the upper surface 137 of the rotational force transmission gear, a rotation flange 127, and an engagement pin 136 extended from the rotation flange 127. , And the cylinder part 133 that enables the rotary flange 127 to move, the piston part 131, and the rotary shaft 11 as a rod part are main components.

  In the figure, 142 is an upper cover that closes the upper end of the cylinder part 133, 143 is a snap ring that stops the upper cover 142, 144a to 144d are sealing materials, 145 and 146 are between the cylinder part 133 as an outer cylinder part and the rotary shaft 11. The upper and lower sleeves 151, 151 is an upper hole for supplying compressed air to one chamber 157 partitioned by the piston portion 131 in the cylinder portion 133, and 152 is for supplying compressed air to the other chamber 158 partitioned by the piston portion 131. The lower holes 154 and 154 are fastening members that fix the second gear 52 to the third gear 53.

That is, the nut runner 10 includes a rotating shaft 11 that is supplied with a driving force by a driving source (reference numeral 23 in FIG. 2) and rotates a bolt or a nut, and a piston that is provided on the rotating shaft 11 and moves the rotating shaft 11 in the axial direction. As a hollow cylindrical member that incorporates a part 131 and a piston part 131, supports the piston part 131 and the rotary shaft 11 so as to be rotatable and movable in the axial direction, and partitions the piston part 131 into one chamber 157 and the other chamber 158. And a clutch mechanism 141 provided between the piston part 131 and the rotational force transmission gear 123 as an output part of the drive source, which connects and disconnects the drive force. Compressed air is introduced into one chamber 157. Then, the rotating shaft 11 and the piston portion 131 extend in the axial direction, and when the clutch mechanism 141 enters, the rotating shaft 11 and the rotating force are applied to the rotating shaft 11. When the compressed air is transmitted to the other chamber 158, the rotary shaft 11 and the piston part 131 contract in the axial direction, and the piston part 131 is separated from the upper surface 137 of the rotational force transmission gear as the rotational force transmission part. Further, when the clutch mechanism 141 is cut, the rotational force to the rotary shaft 11 is cut off.
The rotating shaft 11 is built in the shaft moving mechanism 153 having the cylinder portion 133, the piston portion 131, and the rotating shaft 11 extending from the piston portion 131 as main components.

Referring to FIGS. 1 and 2 together, the nut runner 10 arranges the shaft moving mechanisms on the left and right sides of the rotational force transmission gear 123 so that the two left and right rotating shafts 11L and 11R are respectively shafted. It is possible to connect and disconnect the rotational force from the rotational force transmission gear 123 while moving in the direction.
The nut runner 10 connects and disconnects the drive source 23, the left and right rotary shafts 11 </ b> L and 11 </ b> R to which a driving force is supplied by the drive source 23 and turns the bolts or nuts, and the rotary shaft 11 and the drive source 23. This is a device comprising two clutch mechanisms 141 and 141 and shaft moving mechanisms 153 and 153 for moving two rotating shafts 11L and 11R in the axial direction.

  The rotation shafts are not limited to the left and right sides of the rotational force transmission gear 123, but are not limited to the two left and right rotational shafts as long as there is a space around the rotational force transmission gear 123. It becomes possible to arrange a plurality of rotating shafts having the same structure.

As described above, the switching means 155 provided on each of the rotating shafts 11 (... indicates a plurality. The same applies hereinafter) individually switches the plurality of rotating shafts 11 in the axial direction. By moving, the rotational force can be disconnected and connected between the drive source 23 and each of the rotary shafts 11. That is, each rotating shaft 11... Has a clutch mechanism 141.
Since it is possible to connect / disconnect only by individually moving the rotary shafts 11..., The apparatus structure can be simplified and the apparatus cost can be reduced.

In FIG. 7A, compressed air is supplied to one chamber 157 from the upper hole 151 opened in the cylinder part 133 in the direction of the arrow m, and a downward force is applied to the rotating shaft 11.
In FIG. 7 (b), when the rotating shaft 11 is extended downward and the clutch mechanism 141 is connected, the rotating force of the rotating force transmission gear 123 is transmitted to the rotating shaft 11, and the rotating shaft 11 is moved in the direction of arrow n. The bolt 162 rotates and the bolt 162 attached to the socket 167 provided at the tip of the rotating shaft 11 rotates.

  After the fastening of the bolt 162 is completed, compressed air is supplied from the lower hole 152 to move the rotating shaft 11 upward and to disconnect the clutch mechanism 141, so that the rotating force of the rotating force transmission gear 123 is transmitted to the rotating shaft 11. Do not. The series of actions related to expansion and contraction and rotation of the rotating shaft 11 has been described above.

The operation of the nut runner and the tool change mechanism according to the present invention will be described below.
In FIG. 8A, when the bolt 162 is fastened to the tapping hole 163 opened in the workpiece W, the rotating shaft 11 with the bolt 162 attached to the socket 161 is brought close to the tapping hole 163.

8B, using the shaft moving mechanism (reference numeral 153 in FIG. 6), the rotating shaft 11 is extended downward and rotated while being inserted into the tapping hole 163. When a predetermined tightening torque is reached, the rotation is performed. stop.
In FIG.8 (c), the fastening of the volt | bolt 162 is complete | finished by contracting the rotating shaft 11 upwards using the axis | shaft moving mechanism 153. FIG.

In FIG. 9A, compressed air is supplied to the main body side housing 24 in the direction of the arrow q through the first joint member 115, and the locking member (reference numeral 38 in FIG. 4) is moved to the release position.
In FIG. 9B, the tool part 12 is removed from the main body part 21 with the locking member 38 in the release position. In addition, when attaching the tool part 12 to the main body part 21, it can be attached by operating in the reverse order as described above.
The series of actions relating to the attachment / detachment of the tool portion 12 and the fastening of the nut by the nut runner 10 has been described above.

Referring to FIGS. 5 and 6, rotating shaft 11 is built in shaft moving mechanism 153.
If the rotating shaft is not built in the shaft moving mechanism, for example, if the shaft moving mechanism is disposed inside the rotating shaft, the arrangement of the entrance and exit of a medium such as air that drives the shaft moving mechanism is Limited to the upper surface of the shaft moving mechanism.

  In this regard, in the present invention, since the rotating shaft 11 is built in the shaft moving mechanism 153, the upper hole 151 and the lower hole 152 serving as the inlet / outlet of a medium such as compressed air that drives the shaft moving mechanism 153 are replaced with the cylinder portion 133. Can be placed on the side of That is, it is not always necessary to arrange the cylinder portion 133 at the upper end portion. If it is not necessary to dispose the medium entrance / exit at the upper end of the shaft moving mechanism 153, the degree of freedom in disposing the medium entrance / exit can be increased.

  Further, in order to sufficiently secure the force necessary for expansion and contraction of the rotating shaft 11, it may be necessary to increase the outer diameter of the shaft moving mechanism 153. When the outer diameter of the shaft moving mechanism 153 is increased, the outer diameter of the rotating shaft 11 is increased. When the outer diameter of the rotating shaft 11 is increased, the nut runner 10 may be increased in size.

  In this regard, in the present invention, since the rotating shaft 11 is built in the shaft moving mechanism 153, the shaft moving mechanism 153 can be arranged without being influenced by the shaft diameter of the rotating shaft 11, so that the shaft moving mechanism The force applied to the expansion and contraction of the rotating shaft can be easily secured while suppressing the increase in size of 153. That is, according to the present invention, an increase in the size of the apparatus can be suppressed while securing a force necessary for expansion and contraction.

  2 and 4, the locking mechanism 41 is provided on the inner surface of the tool housing 13 so as to engage with the locking member 38 provided on the first housing and the locking member 38. The hook portion 86 is engaged with the locking member 38, and the tool portion 12 is attached to the main body portion 21.

  With such a structure, the locking mechanism 41 including the locking member 38 is covered with the tool housing 13 after the tool portion 12 is mounted on the main body portion 21, so that it is not exposed, and the tool changing mechanism 31 is not exposed. Appearance can be improved.

  In summary, since the locking mechanism 41 is provided inside the main body side housing 24, the tool changing mechanism 31 is not exposed after the tool portion 12 is mounted on the main body portion 21. Can increase the sex.

  The present invention is suitable for a nut runner provided with a tool changing mechanism.

  DESCRIPTION OF SYMBOLS 12 ... Tool part, 13 ... 2nd housing (tool housing), 21 ... Main body part, 24 ... 1st housing (main body side housing), 25 ... Drive shaft, 31 ... Tool exchange mechanism, 37 ... Inner cylinder part, 38 ... Locking member, 41 ... locking mechanism, 44 ... driven shaft, 78 ... elastic member, 83 ... recess, 86 ... hooking part.

Claims (3)

A main body having a drive shaft for transmitting a driving force; a driven shaft that is detachably provided on the main body and is driven by being engaged with the drive shaft; and a tool portion having a tool driven by the driven shaft; In the tool change mechanism consisting of
The main body portion is provided with a locking mechanism for locking the tool portion,
The locking mechanism includes a first housing that surrounds the drive shaft, an inner cylinder portion that is slidable in the axial direction of the drive shaft on the inner surface of the first housing, and a forward and backward movement of the inner cylinder portion. A locking member that rotates,
The tool portion includes a second housing that surrounds the periphery of the driven shaft, and a hook portion that is provided on the inner surface of the second housing and is locked by the locking member,
A tool exchanging mechanism, wherein the locking member is in a locking position where the locking member is hooked on the hooking portion or a releasing position where the locking member is released from the hooking portion.   The tool exchange mechanism according to claim 1, wherein the inner cylinder portion is provided with a concave portion that engages with the locking member and rotates the locking member.   An elastic member is provided between the first housing and the inner cylinder portion, and the locking member biases the inner cylinder portion toward the locking position on the hooking portion. The tool change mechanism according to claim 1 or 2.

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