JP2020142356A - Working tool - Google Patents

Abstract

To provide a technique contributing to easy detachment of a front end-tool in a working tool in which the front end-tool is driven in an oscillated manner .SOLUTION: A vibration tool comprises a housing, a spindle 3A, a clamp shaft 51, a clamp spring 59, a turning lever 81, a first cam portion 33, a second cam portion 55, and an intermediate shaft 53. The clamp spring 59 energizes the clamp shaft 51 upward with respect to the spindle 3A, and applies clamp force for clamping a front end-tool 91 between a head portion 515 and a tool attachment portion 35. The intermediate shaft 53 can move at least in a vertical direction with respect to the spindle 3A. The first cam portion 33 and the second cam portion 55 are configured to vertically move the intermediate shaft 53 in conjunction with turning of a turning lever 81. The intermediate shaft 53 is moved downward to push the front end-tool 91 downward when the turning lever 81 is turned in a releasing direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to a work tool that swing-drives a tip tool to perform machining work on a work material.

A work tool (so-called vibration tool) that performs a machining operation on a work material by swinging and driving a tip tool mounted on a spindle within a predetermined angle range is known. The tip tool is clamped by, for example, the lower end of the spindle and the lower end of a clamp shaft that is coaxial with the spindle and urged upward with respect to the spindle (see, for example, Patent Document 1). ..
(See Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-39178

In the clamp type vibration tool as described above, if the tip tool is oscillated while being firmly pressed against the spindle, the tip tool will stick to the lower end of the spindle and the tip tool will be removed. Can be difficult. Therefore, there is room for improvement in the vibrating tool regarding the removal of the tip tool.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a technique that contributes to easy removal of a tip tool in a work tool that swings and drives the tip tool.

In one aspect of the present invention, there is provided a work tool that swing-drives a tip tool to perform machining work on a work piece. This work tool includes a housing, a spindle, a clamp shaft, an urging member, an operating member, a motion conversion mechanism, and a pushing member.

The spindle has a tubular shape and is rotatably supported by a housing around a drive shaft that defines the vertical direction of the work tool. The clamp shaft has a shaft portion and a head portion. The shaft portion extends coaxially with the spindle in the spindle. The head portion is connected to the lower end of the shaft portion. The clamp shaft can move up and down with respect to the spindle. The urging member is configured to urge the clamp shaft upward with respect to the spindle to provide a clamping force for clamping the tip tool between the head portion and the lower end portion of the spindle. The operating member is configured to rotate around a drive shaft by an external operation of the user. The motion conversion mechanism is configured to convert the rotational motion around the drive axis into a linear motion along the drive axis. The push-down member is arranged so as to be movable at least in the vertical direction with respect to the spindle. The motion conversion mechanism is configured to move the pushing member in the vertical direction in conjunction with the rotation of the operating member around the drive shaft. The push-down member is configured to be moved downward to push down the tip tool when the operating member is rotated in the first direction.

According to the work tool of this embodiment, when the operating member is rotated in the first direction by the user, the pushing member is moved downward with respect to the spindle by the motion conversion mechanism, and the tip tool is moved downward in the process. Push down. Therefore, even if the tip tool is stuck to the lower end of the spindle, the user can easily remove the tip tool simply by rotating the operating member in the first direction.

The motion conversion mechanism can be configured as, for example, a cam mechanism that utilizes an inclined surface or an inclined groove, or a screw mechanism that utilizes a screw groove. Further, the motion conversion mechanism may directly convert the rotation of the operating member into the vertical movement of the pushing member, or may convert it via another member. For example, the motion conversion mechanism may convert the rotation of the pressing member linked to the rotation of the operating member into the vertical movement of the pressing member, or the rotation of the operating member may be referred to as the pressing member. May be converted into vertical movement of different members and transmitted to the pressing member.

In one aspect of the present invention, the work tool further comprises a release member configured to release the clamping force against the urging force of the urging member in conjunction with the rotation of the operating member in the first direction. You may prepare. Then, the pushing-down member may be configured to push down the tip tool downward with the clamping force released by the releasing member. According to this aspect, when the operating member is rotated in the first direction by the user, the tip tool is pushed down with the clamping force released. Therefore, it is not necessary to apply an excessive pushing force to the tip tool.

In one aspect of the invention, the clamp shaft may be removable from the spindle. The work tool may further include a locking mechanism provided within the housing and configured to irremovably lock the clamp shaft from the spindle. According to this aspect, the user can remove the clamp shaft from the spindle and replace the tip tool.

In one aspect of the present invention, the work tool further comprises a release member configured to release the clamping force against the urging force of the urging member in conjunction with the rotation of the operating member in the first direction. You may prepare. Then, in conjunction with the rotation in the first direction, the clamping force may be released by the releasing member, the tip tool may be pushed down by the pushing member, and the clamp shaft may be unlocked by the locking mechanism in order. According to this aspect, the user can perform the clamping force releasing operation, the tip tool pushing down operation, and the clamping shaft unlocking operation most efficiently with only a single operation of rotating the operating member in the first direction. It can be done by the work tool in the proper order.

In one aspect of the present invention, the release member may be configured to release the clamping force in conjunction with the operating member being rotated in the first direction within a predetermined angle range from the reference position. .. Then, the motion conversion mechanism may be configured to move the pushing member downward in conjunction with the operation member being rotated in the first direction within an angle range from the reference position. Further, the locking mechanism may be configured to unlock the clamp shaft in conjunction with the operating member being rotated in the first direction beyond the angular range. According to this aspect, the clamping force is released and the tip tool is pushed down by the pushing member while the user rotates the operating member from the reference position to a predetermined angle range in the first direction. After that, when the user further rotates the operating member beyond a predetermined angle range in the first direction, the clamp shaft is unlocked and the clamp shaft can be removed. The user releases the clamp force, pushes down the tip tool, and then unlocks the clamp shaft with only a single operation of rotating the operating member in the first direction beyond a predetermined angle range. The work tool can be made to perform an efficient series of operations.

In one aspect of the present invention, the locking mechanism may be configured to tentatively hold the clamp shaft when the clamp shaft is unlocked. The term "temporarily held" in this embodiment means to maintain the position of the clamp shaft with respect to the spindle unless an external force (typically, a force in the pulling direction by the user) is applied to the clamp shaft. is there. "Temporarily holding" can also be rephrased as "holding detachably from the spindle according to the pulling operation by the user". According to this aspect, it is possible to prevent the clamp shaft from falling off from the spindle when the clamp shaft is unlocked.

In one aspect of the invention, the push-down member may be supported by the housing via a spindle. Then, the lock mechanism may be configured to lock the clamp shaft by fixing the clamp shaft to the pressing member. According to this aspect, a lock mechanism having a rational configuration is realized.

In one aspect of the invention, the push-down member may include a tubular portion that is coaxial with the spindle and is located between the spindle and the shaft portion in the radial direction of the spindle. Then, the work tool may further include a first seal member arranged between the tubular portion and the spindle. According to this aspect, it is possible to prevent foreign matter such as dust from entering the spindle from between the tubular portion and the spindle.

In one aspect of the present invention, the work tool may further include a second seal member arranged between the tubular portion and the spindle above the first seal member. The motion conversion mechanism is a cam mechanism including a first portion provided on the spindle and a second portion provided on the tubular portion, and is a cam mechanism of the first seal member and the second seal member in the vertical direction. It may be arranged between them. According to this aspect, the smooth operation of the cam mechanism can be ensured by enclosing the lubricant between the first seal member and the second seal member.

In one aspect of the present invention, the motion conversion mechanism may be a cam mechanism including a first cam portion and a second cam portion. The first cam portion may have an inclined groove inclined in the circumferential direction around the drive shaft. The second cam portion may have a curved surface that matches a part of the inclined groove, and may have an engaging portion that is slidably configured in the inclined groove. According to this aspect, a relatively small cam mechanism can be realized.

In one aspect of the present invention, the operating member may be configured to rotate the pushing member around the drive shaft with respect to the spindle as it rotates. The motion conversion mechanism is a cam mechanism that utilizes an inclined surface or an inclined groove that is inclined in the circumferential direction around the drive shaft so as to convert the rotation of the pressing member into a linear movement in the vertical direction of the pressing member. It may be configured. Then, the inclined surface or the inclined groove may be configured to incline downward to a predetermined boundary toward the first direction, and to incline upward when the boundary is crossed. According to this aspect, when the pressing member rotates relative to the rotation of the operating member in the first direction, the portion of the inclined surface or the inclined groove that inclines downward toward the first direction (to the boundary). The pressing member moves downward by the action of the part). However, since the portion of the inclined surface or the inclined groove that exceeds the boundary is inclined upward, the pressing member moves downward and then upward. Thereby, it is possible to clarify the end of the downward movement of the pressing member.

In one aspect of the present invention, the push-down member may be inserted through the spindle and may be configured to reciprocate around the drive shaft together with the spindle when the tip tool is swung. Then, the work tool may further include a bearing member arranged between the housing and the pressing member in the radial direction with respect to the drive shaft. According to this aspect, it is possible to effectively prevent the pressing member from tilting with respect to the drive shaft while ensuring smooth rotation of the pressing member.

In one aspect of the present invention, the operating member may be configured to rotate the pushing member around the drive shaft with respect to the spindle as it rotates. The urging member may extend in the vertical direction, and the spindle and the pressing member may be urged in the vertical direction so as to be separated from each other. Then, the work tool may further include a friction reducing member arranged between the upper end or the lower end of the urging member and the spindle or the pressing member. According to this aspect, when the operating member rotates, the pressing member can smoothly rotate with respect to the spindle.

In one aspect of the present invention, there is provided a work tool that swing-drives a tip tool to perform machining work on a work piece. The work tool includes a housing, a spindle, a clamp shaft, an urging member, a locking mechanism, a releasing member, and an operating member.

The spindle has a tubular shape and is rotatably supported by a housing around a drive shaft that defines the vertical direction of the work tool. The clamp shaft has a shaft portion and a head portion. The shaft portion extends coaxially with the spindle in the spindle. The head portion is connected to the lower end of the shaft portion. The clamp shaft can move up and down with respect to the spindle. The urging member is configured to urge the clamp shaft upward with respect to the spindle to provide a clamping force for clamping the tip tool between the head portion and the lower end portion of the spindle. The locking mechanism is provided in the housing and is configured to irremovably lock the clamp shaft from the spindle. The release member is configured to release the clamping force against the urging force of the urging member. The operating member is configured to rotate around a drive shaft by an external operation of the user. The locking mechanism is configured to unlock the clamp shaft in conjunction with the rotation of the operating member in the first direction. Further, the release member is configured to release the clamping force in conjunction with the rotation of the operation member in the first direction.

According to this aspect, the user can cause the work tool to perform both the unlocking operation of the clamp shaft and the releasing operation of the clamping force by only a single operation of rotating the operating member in the first direction. it can.

In one aspect of the present invention, the release member may be configured to release the clamping force in conjunction with the operating member being rotated in the first direction within a predetermined angle range from the reference position. .. Then, the lock mechanism may be configured to unlock the clamp shaft in conjunction with the operation member being rotated in the first direction beyond the angular range. According to this aspect, the clamping force is released while the user rotates the operating member from the reference position to a predetermined angle range in the first direction, and then the user exceeds the operating member over the predetermined angle range. When it is further rotated in the first direction, the clamp shaft is unlocked and the clamp shaft can be removed. The user performs an efficient series of operations of unlocking the clamp shaft after releasing the clamping force by only a single operation of rotating the operating member in the first direction beyond a predetermined angle range. Can be done by a work tool.

It is the whole perspective view of the vibrating tool when the rotary lever is in the initial position. It is sectional drawing of the vibrating tool when the rotary lever is in an initial position. It is a partially enlarged view of FIG. FIG. 5 is a cross-sectional view of the spindle, the clamp mechanism, and the rotary lever when the rotary lever is in the initial position (cross-sectional view passing through the center of the ball and the drive shaft shown in FIG. 3). It is an exploded perspective view of a spindle, a clamp mechanism, and a rotating lever. FIG. 2 is a cross-sectional view taken along the line VI-VI of FIG. 2 (however, only the clamp shaft, intermediate shaft, ball and lock sleeve are shown). Cross-sectional view of the spindle, clamp mechanism, and rotary lever when the rotary lever is rotated approximately 90 degrees in the release direction from the initial position (cross-sectional view passing through the center of the ball and the drive shaft shown in FIG. 3). Is. FIG. 6 is a cross-sectional view corresponding to FIG. 6, showing a state when the rotation lever is rotated by approximately 90 degrees in the release direction from the initial position. It is explanatory drawing which shows the 1st cam part and 2nd cam part when the rotary lever is in an initial position. It is explanatory drawing which shows the 1st cam part and 2nd cam part when the rotation lever is rotated about 65 degrees in the release direction from the initial position. FIG. 6 is a cross-sectional view corresponding to FIG. 6, showing a state when the rotation lever is rotated by approximately 65 degrees in the release direction from the initial position. It is explanatory drawing which shows the 1st cam part and 2nd cam part when the rotation lever is rotated about 90 degrees in the release direction from the initial position. It is explanatory drawing which shows the 1st cam part and 2nd cam part when the rotation lever is rotated about 120 degrees in the release direction from the initial position. FIG. 6 is a cross-sectional view corresponding to FIG. 6, showing a state when the rotation lever is rotated by approximately 120 degrees in the release direction from the initial position. It is sectional drawing of the front end part of another vibrating tool when the rotary lever is in the initial position. It is a perspective view of a clamp shaft. It is an enlarged view of the spindle, the clamp mechanism and the rotating lever of FIG. It is a perspective view of an intermediate shaft and a lock mechanism. It is a perspective view of a spindle. It is a development view of the 1st cam part.

Hereinafter, embodiments will be described with reference to the drawings.

[First Embodiment]
Hereinafter, the vibration tool 1A according to the first embodiment will be described. The vibrating tool 1A is an example of an electric work tool that swings and drives the tip tool 91 to perform machining work on a work material (not shown) (see FIG. 1). The vibrating tool 1A is provided with a plurality of types of blades, scrapers, grinding pads, polishing pads, and the like as mountable tip tools 91. The user can select one of these tip tools 91 suitable for a desired machining operation such as cutting, peeling, grinding, and polishing, attach it to the vibrating tool 1A, and perform the machining operation. In the drawings referred to below, as an example of the tip tool 91, an example in which the blade is attached to the vibration tool 1A is shown.

First, the schematic configuration of the vibration tool 1A will be described. As shown in FIGS. 1 and 2, the vibrating tool 1A includes a long housing (also referred to as a tool body) 10. A spindle 3A and a motor 21 are housed in one end of the housing 10 in the long axis direction. The spindle 3A is arranged along a drive shaft A1 that intersects the long axis of the housing 10 (specifically, is substantially orthogonal). One end of the spindle 3A in the axial direction of the drive shaft A1 (hereinafter, also referred to as the drive shaft A1 direction) protrudes from the housing 10 and is exposed to the outside. A tip tool 91 can be attached to and detached from this portion. Further, a battery 93 for supplying power to the motor 21 can be attached to and detached from the other end of the housing 10 in the long axis direction. The central portion of the housing 10 in the long axis direction is formed in a tubular shape having a diameter smaller than that of both end portions, and constitutes a grip portion 15 to be gripped by the user. The vibrating tool 1A reciprocates the spindle 3A around the drive shaft A1 within a predetermined angle range by the power of the motor 21, so that the tip tool 91 is rotated at a predetermined angle in the swing plane orthogonal to the drive shaft A1. Swing within range.

In the following description, for convenience, the direction of the drive shaft A1 is defined as the vertical direction with respect to the direction of the vibrating tool 1A. In the vertical direction, one end side of the spindle 3A on which the tip tool 91 is mounted is defined as the lower side, and the opposite side is defined as the upper side. Further, a direction orthogonal to the drive shaft A1 and corresponding to the extending direction of the housing 10 (that is, the long axis direction of the housing 10) is defined as the front-rear direction. In the front-rear direction, one end side of the housing 10 in which the spindle 3A is housed is defined as the front side, and the other end side in which the battery 93 is mounted is defined as the rear side. Further, the direction orthogonal to the vertical direction and the front-back direction is defined as the left-right direction.

Hereinafter, the detailed configuration of the vibration tool 1A will be described.

First, the housing 10 will be described. As shown in FIG. 2, the housing 10 of the present embodiment is configured as a so-called anti-vibration housing, and includes an outer housing 101 and an inner housing 103. The outer housing 101 is a long hollow body extending in the front-rear direction, and forms an outer shell of the vibrating tool 1A. The inner housing 103 is a long hollow body extending in the front-rear direction, and is housed in the outer housing 101. The inner housing 103 accommodates the motor 21, the spindle 3A, and the like. Although not shown in detail, the outer housing 101 is connected to the inner housing 103 via a plurality of elastic members, and can move relative to the inner housing 103 in the front-back, left-right, and up-down directions.

As shown in FIG. 1, a rotating lever 81 is provided on the upper portion of the front end portion 11 of the housing 10 (outer housing 101). The rotary lever 81 is configured as a clamp for the tip tool 91 by a clamp mechanism 5A (see FIG. 3) described later and an operation member for releasing the clamp, and can be rotated around the drive shaft A1 by the rotation operation of the user. It is located in. In the present embodiment, the rotary lever 81 includes a disk-shaped fixing portion 811 rotatably supported by the housing 10 around the drive shaft A1 (see FIG. 2) and a lever extending substantially tangentially from the fixing portion 811. 813 and is included. Further, a pair of protrusions 815 project downward from the lower end of the fixing portion 811 (see FIG. 5). The protrusions 815 are arranged symmetrically with respect to the drive shaft A1 and are configured to rotate the intermediate shaft 53, which will be described later, in conjunction with the rotation of the rotation lever 81.

As shown in FIG. 1, in the present embodiment, the rotary lever 81 is set in the counterclockwise direction when viewed from above (the lever 813 is the front end) with the position where the lever 813 abuts on the right side surface of the front end 11 as the initial position. It can rotate approximately 120 degrees in the direction away from the right side surface of the portion 11. Although the details will be described later, since the clamp of the tip tool 91 is released by the rotation of the rotation lever 81 in the counterclockwise direction when viewed from above, this direction is also referred to as the release direction in the following. On the contrary, the clockwise direction when viewed from above the rotary lever 81 is also referred to as a clamp direction. The interlocking of the rotating lever 81 and the clamp mechanism 5A will be described later.

A slider 27 is provided on the upper part (rear side of the rotating lever 81) of the boundary region between the front end portion 11 and the grip portion 15 of the housing 10. The slider 27 is arranged so as to be slidable in the front-rear direction according to the operation of the user, and is configured as an operating member for switching on / off of the switch 29 (see FIG. 2) housed in the grip portion 15. ing. A rotary speed change dial 28 for steplessly setting the rotation speed of the motor 21 is arranged on the upper portion of the rear end portion 13 so as to be externally operable.

Hereinafter, the internal structure of the housing 10 will be described.

As shown in FIG. 2, the rear end portion 13 of the housing 10 (specifically, the outer housing 101) is provided with a battery mounting portion 131 configured so that the battery 93 can be attached and detached. The battery mounting portion 131 has an engaging structure in which the rechargeable battery 93 can be slidably engaged, and a terminal that can be connected to the terminal of the battery 93 when the battery 93 is engaged. Since the configurations of the battery mounting portion 131 and the battery 93 themselves are well known, the description thereof is omitted here. Further, a controller 20 for controlling the drive of the motor 21 is housed in the rear end portion 13 of the housing 10 (specifically, the outer housing 101). In the present embodiment, the controller 20 is configured to drive the motor 21 at the rotation speed set by the speed change dial 28 when the switch 29 is switched on.

Further, as shown in FIG. 3, a spindle 3A, a motor 21, a transmission mechanism 4, and a clamp mechanism 5A are housed in the front end portion 11 of the housing 10 (specifically, the inner housing 103). Hereinafter, these configurations will be described in order.

As shown in FIG. 3, the spindle 3A is rotatably supported around the drive shaft A1 by two bearings 301 and 302 held in the housing 10 (inner housing 103) at the lower part of the front end portion 11. As shown in FIGS. 4 and 5, the spindle 3A is a long cylindrical member. In this embodiment, the spindle 3A includes an integrally formed cylindrical portion 31 and a flange portion 32.

The cylindrical portion 31 is a cylindrical portion having a uniform inner diameter, and extends in the vertical direction along the drive shaft A1. An intermediate shaft 53, which will be described later, is inserted inside the cylindrical portion 31. The bearings 301 and 302 support the upper end portion and the lower end portion of the cylindrical portion 31, respectively.

The flange portion 32 is a flange-shaped portion connected to the lower end of the cylindrical portion 31. The lower end of the flange portion 32 is configured as a tool mounting portion 35 on which the tip tool 91 is mounted. The tool mounting portion 35 has a recess 351 that is recessed upward. The surface defining the recess 351 (inner peripheral surface of the tool mounting portion 35) includes an inclined surface 353 that inclines in a direction away from the drive shaft A1 (outward in the radial direction) as it goes downward. On the other hand, each of the tip tools 91 (blades, scrapers, grinding pads, polishing pads, etc.) that can be mounted on the vibrating tool 1A has a convex portion 911 that can be fitted into the concave portion 351 of the tool mounting portion 35. A through hole 912 through which the shaft portion 511 of the clamp shaft 51 can be inserted is provided in the central portion of the convex portion 911. Further, a part of the upper surface defining the convex portion 911 is configured as an inclined surface 913 that matches the inclined surface 353. In the present embodiment, the tip tool 91 is clamped by the tool mounting portion 35 and the head portion 515 of the clamp shaft 51 described later in a state where the inclined surface 913 is in contact with the inclined surface 353, and is fixed to the spindle 3A. Will be done. Fixing the tip tool 91 to the spindle 3A will be described in detail later.

Further, as shown in FIG. 4, a first cam portion 33 is provided inside the upper end portion of the flange portion 32. The first cam portion 33 cooperates with the second cam portion 55 of the intermediate shaft 53, which will be described later, so as to move the intermediate shaft 53 in the vertical direction with respect to the spindle 3A as the intermediate shaft 53 rotates. It is configured. The detailed configuration of the first cam unit 33 will be described later.

A seal member 39 is fitted inside the flange portion 32. More specifically, the seal member 39 is fitted in a portion (upper portion of the recess 351) between the tool mounting portion 35 and the first cam portion 33. A flange portion 56 of an intermediate shaft 53, which will be described later, is slidably inserted into the seal member 39. In the present embodiment, the seal member 39 is an oil seal, and is a lubricant for lubricating the sliding surfaces of the first cam portion 33 and the second cam portion 55 from between the tool mounting portion 35 and the intermediate shaft 53. Is prevented from leaking to the outside, and foreign matter such as dust is prevented from entering from the outside.

As shown in FIG. 3, the motor 21 as a drive source includes a stator, a rotor, and an output shaft 211 extending from the rotor and rotating integrally with the rotor. The motor 21 is arranged so that the rotation shaft A2 of the output shaft 211 extends parallel to the drive shaft A1 of the spindle 3A (that is, in the vertical direction). The output shaft 211 projects downward from the rotor. In this embodiment, a brushless DC motor is adopted as the motor 21.

The transmission mechanism 4 is configured to transmit the rotational motion of the motor 21 to the spindle 3A and reciprocate the spindle 3A within a predetermined angle range around the drive shaft A1. As shown in FIG. 3, the transmission mechanism 4 includes an eccentric shaft 41, a swing arm 43, and a bearing 45. The eccentric shaft 41 is coaxially connected to the output shaft 211 on the lower side of the main body (stator and rotor) of the motor 21. The eccentric shaft 41 has an eccentric portion eccentric with respect to the rotation shaft A2. A bearing 45 is attached to the outer peripheral portion of the eccentric portion. The swing arm 43 is a member that connects the bearing 45 and the spindle 3A. One end of the swing arm 43 is formed in an annular shape (see FIG. 5) and is fixed to the outer periphery of the spindle 3A (specifically, the cylindrical portion 31) between the bearings 301 and 302. On the other hand, the other end of the swing arm 43 is formed in a bifurcated shape (see FIG. 5), and is arranged so as to abut on the outer circumference of the outer ring of the bearing 45 from the left and right.

When the motor 21 is driven, the eccentric shaft 41 rotates integrally with the output shaft 211. As the eccentric shaft 41 rotates, the center of the eccentric portion moves around the rotation shaft A2, so that the bearing 45 also moves around the rotation shaft A2. As a result, the swing arm 43 swings within a predetermined angle range with the spindle 3A as a fulcrum. Since one end of the annular shape of the swing arm 43 is fixed to the spindle 3A, the spindle 3A reciprocates within a predetermined angle range around the drive shaft A1 as the swing arm 43 swings. .. As a result, the tip tool 91 fixed to the spindle 3A (more specifically, the tool mounting portion 35) is oscillated and driven, so that the machining work can be performed.

The clamp mechanism 5A is a mechanism configured to press the tip tool 91 upward against the tool mounting portion 35 and fix it to the tool mounting portion 35 so as to be rotatable integrally with the spindle 3A. As shown in FIG. 3, in the present embodiment, the clamp mechanism 5A includes a clamp shaft 51, an intermediate shaft 53, a clamp spring 59, and a lock mechanism 6A. Hereinafter, these configurations will be described in order.

First, the clamp shaft 51 will be described. The clamp shaft 51 is a long member that is inserted into the spindle 3A to fix the tip tool 91 to the spindle 3A. In this embodiment, the clamp shaft 51 is configured to be removable from the spindle 3A. As shown in FIGS. 4 and 5, the clamp shaft 51 includes an integrally formed shaft portion 511 and a head portion 515.

The shaft portion 511 is a long round bar (cylinder) -shaped portion, which is arranged coaxially with the spindle 3A in the spindle 3A (more specifically, in the intermediate shaft 53 described later) and extends in the vertical direction. Exists. An annular engaging groove 512 having a substantially semicircular cross section is formed at the upper end of the shaft portion 511. A ball 61 can be engaged with the engaging groove 512. An annular elastic member (also referred to as an O-ring) 513 is mounted in the annular groove formed at the lower end of the shaft portion 511. The head portion 515 is a portion having a diameter larger than that of the shaft portion 511, which is connected to the lower end of the shaft portion 511. The head portion 515 is a portion that comes into contact with the tip tool 91 from below and presses the tip tool 91 against the tool mounting portion 35. In the present embodiment, the head portion 515 is formed in a columnar shape, but the head portion 515 may have another shape.

The intermediate shaft 53 will be described. As shown in FIG. 3, the intermediate shaft 53 is arranged coaxially with the spindle 3A, extends in the vertical direction, and is configured to hold the clamp shaft 51. Further, the intermediate shaft 53 is arranged so as to be rotatable around the drive shaft A1 and movable in the vertical direction with respect to the spindle 3A. In the present embodiment, the intermediate shaft 53 is configured as a long member, and is supported by the housing 10 (specifically, the inner housing 103) via the spindle 3A in a state of being inserted through the spindle 3A.

As shown in FIGS. 4 and 5, the intermediate shaft 53 includes an integrally formed cylindrical lower portion 54 and a round bar-shaped upper portion 57.

The shaft portion 511 of the clamp shaft 51 is inserted into the lower portion 54. The inner diameter of the lower portion 54 is substantially equal to the diameter of the shaft portion 511 (the portion other than the engaging groove 512). Further, the axial length of the lower portion 54 is longer than that of the spindle 3A, and the upper end portion of the lower portion 54 (the lock portion 541 described later) projects upward from the upper end of the spindle 3A. The lower portion 54 includes a lock portion 541, a sliding portion 545, and a flange portion 56.

The lock portion 541 is an upper end portion of the lower portion 54, and is a portion where the upper end portion of the shaft portion 511 including the engaging groove 512 is arranged when the shaft portion 511 is inserted to the maximum. As shown in FIG. 6, the lock portion 541 is provided with three ball holding holes 542. Each ball holding hole 542 is configured to hold the ball 61 so as to be movable in the radial direction. The ball holding hole 542 is inside the inner peripheral surface of the lock portion 541 (innermost end of the ball holding hole 542) (drive shaft A1) when the ball 61 is arranged on the innermost side in the radial direction within the moving range. It is configured to allow a part of the ball 61 to protrude to the side), but prohibit the ball 61 from falling inward. When the balls 61 are arranged on the innermost side in the radial direction, a part of the balls 61 projects outward from the outer peripheral surface of the lock portion 541.

As shown in FIG. 4, the sliding portion 545 is a portion extending downward from the lower end of the lock portion 541. The sliding portion 545 is a portion slidably arranged in the spindle 3A and has an outer diameter substantially equal to the inner diameter of the cylindrical portion 31. The outer diameter of the sliding portion 545 is larger than the outer diameter of the lock portion 541. An annular elastic member (also referred to as an O-ring) 546 is mounted in the annular groove formed on the outer peripheral portion of the sliding portion 545. A lubricant for ensuring smooth sliding of the first cam portion 33 and the second cam portion 55 is sealed between the elastic member 546 and the seal member 39 described above.

As shown in FIGS. 4 and 5, the flange portion 56 is a flange-shaped portion connected to the lower end portion of the sliding portion 545, and constitutes the lower end portion of the intermediate shaft 53. The lower end surface of the flange portion 56 is configured as an annular flat surface. The flange portion 56 (specifically, the lower end surface of the flange portion 56) functions as a portion that abuts on the tip tool 91 from above and pushes down the tip tool 91 in the process of the intermediate shaft 53 moving downward with respect to the spindle 3A. To do.

A second cam portion 55 is provided above the flange portion 56. The second cam portion 55 is configured to cooperate with the first cam portion 33 of the spindle 3A to move the intermediate shaft 53 in the vertical direction with respect to the spindle 3A as the intermediate shaft 53 rotates. There is. The detailed configuration of the second cam portion 55 and the actions of the first cam portion 33 and the second cam portion 55 will be described later.

The upper portion 57 has a diameter smaller than the outer diameter of the lock portion 541 and extends upward from the central portion of the upper end of the lock portion 541. The upper end portion of the upper portion 57 is configured as a male screw portion 571. Further, a fitting hole 573 that penetrates the upper portion 57 in the radial direction is provided in the upper portion of the upper portion 57 (lower side of the male screw portion 571). A pin 574 is fitted in the fitting hole 573. Both ends of the pin 574 project outward from the fitting hole 573.

A rotation transmission member 576 is arranged above the pin 574. The rotation transmission member 576 is a member configured to transmit the rotation of the rotation lever 81 to the intermediate shaft 53, and is fixed to the intermediate shaft 53. In the present embodiment, the rotation transmission member 576 is a substantially hexagonal columnar member having a through hole in the central portion, and is fitted to the intermediate shaft 53 (upper portion 57) above the pin 574. Although detailed illustration is omitted, a linear groove is formed at the lower end of the rotation transmission member 576, and both ends of the pin 574 protruding from the fitting hole 573 are engaged with the groove. .. The rotation transmission member 576 is integrated with the intermediate shaft 53 by being fastened to the pin 574 by a nut 572 screwed into the male screw portion 571.

The rotation transmission member 576 has a pair of recesses 577 at the top. The recesses 577 are arranged symmetrically with the drive shaft A1 in between. The protrusion 815 of the rotary lever 81 always protrudes into the recess 577. When the rotation lever 81 is rotated, the protrusion 815 comes into contact with the side surface of the recess 577 and rotates the intermediate shaft 53 via the rotation transmission member 576. That is, the intermediate shaft 53 rotates around the drive shaft A1 with respect to the spindle 3A in conjunction with the rotation of the rotation lever 81. The length of the recess 577 in the circumferential direction is set to be larger than the diameter of the protrusion 815. As a result, when the protrusion 815 is separated from the side surface of the recess 577, the rotation lever 81 and the intermediate shaft 53 are prevented from interlocking with each other. When the rotary lever 81 is arranged at the initial position (see FIG. 1), the protrusion 815 is arranged at a position away from the side surface of the recess 577.

The clamp spring 59 is a member that urges the clamp shaft 51 upward and applies a clamping force for clamping the tip tool 91 to the clamp shaft 51. In the present embodiment, the clamp spring 59 is configured to urge the clamp shaft 51 upward via the intermediate shaft 53, and always urges the intermediate shaft 53 upward with respect to the spindle 3A. ing. More specifically, the clamp spring 59 is a compression coil spring, which is fitted to an annular spring receiving portion 37 fitted to the intermediate shaft 53 on the upper side of the spindle 3A and to the intermediate shaft 53 on the lower side of the pin 574. It is arranged in a compressed state between the spring receiving portion 579 and the spring receiving portion 579. The lower spring receiving portion 37 is non-rotatably engaged with the spindle 3A and rotates integrally with the spindle 3A.

Hereinafter, the lock mechanism 6A will be described. The lock mechanism 6A is configured to irremovably lock the clamp shaft 51 from the spindle 3A. In the present embodiment, the lock mechanism 6A is configured to lock the clamp shaft 51 by fixing the clamp shaft 51 to the intermediate shaft 53.

As shown in FIGS. 4 and 5, the locking mechanism 6A includes three balls 61, a lock sleeve 63, and a ball urging spring 67.

As described above, the three balls 61 are respectively arranged so as to be movable in the radial direction in the three ball holding holes 542 of the intermediate shaft 53.

The lock sleeve 63 is a member that holds the ball 61 so as not to fall out from the ball holding hole 542 in the radial direction. In the present embodiment, the lock sleeve 63 is a cylindrical member as a whole, and is arranged above the spindle 3A and radially outside the lock portion 541 of the intermediate shaft 53. The lock sleeve 63 includes a sliding portion 631 integrally formed, a ball holding portion 633, and a locking projection 638.

The sliding portion 631 is a cylindrical portion having an inner diameter substantially equal to the outer diameter of the lock portion 541 of the intermediate shaft 53, and is slidably fitted to the lock portion 541.

The ball holding portion 633 is a cylindrical portion connected to the lower end of the sliding portion 631. As shown in FIGS. 4 and 6, the inner diameter of the ball holding portion 633 is slightly larger than the inner diameter of the sliding portion 631, and the connecting portion between the sliding portion 631 and the ball holding portion 633 has a shoulder portion (stepped portion). ) 634 is formed. The shoulder portion 634 has an inner peripheral surface that curves while being slightly inclined outward in the radial direction as it goes downward. The inner peripheral surface of the shoulder portion 634 is configured to be substantially aligned with the outer peripheral surface of the ball 61. The inner diameter of the ball holding portion 633 is the inner peripheral surface of the ball holding portion 633 and the clamp shaft when the ball 61 is arranged on the innermost radial direction within the moving range and engages with the engaging groove 512 of the clamp shaft 51. The length is set so that the ball 61 is sandwiched by the bottom surface of the engaging groove 512 of 51.

Further, as shown in FIGS. 6 and 7, three ball receiving portions 635 are provided inside the ball holding portion 633. The three ball receiving portions 635 are provided at equal intervals in the circumferential direction of the ball holding portion 633. Each ball receiving portion 635 is a recess recessed radially outward from the inner peripheral surface of the ball holding portion 633, and forms a space for retracting the ball 61 when the clamp shaft 51 is unlocked. As shown by the dotted line in FIG. 6, the depth of the ball receiving portion 635 in the radial direction is set so that the ball 61 can be retracted to a position where the ball 61 does not protrude inward in the radial direction from the ball holding hole 542. Further, the length of the ball receiving portion 635 in the circumferential direction is set to be longer than the diameter of the ball 61 and correspond to a predetermined angle range (approximately 30 degrees in the present embodiment) centered on the drive shaft A1. ing.

As shown in FIGS. 5 and 7, the locking protrusion 638 is a rectangular protrusion that protrudes downward from the lower end of the ball holding portion 633. The locking projection 638 is fitted in a recess 371 provided in the lower spring receiving portion 37. The recess 371 is a recess that is recessed downward from the upper end of the spring receiving portion 37, and is formed in a rectangular shape that substantially matches the locking protrusion 638. Due to the engagement between the locking projection 638 and the recess 371, the lock sleeve 63 is made non-rotatable with respect to the spring receiving portion 37 and thus the spindle 3A. On the other hand, the locking projection 638 can slide in the recess 371 in the vertical direction, and the locking projection 63 is allowed to move in the vertical direction with respect to the spindle 3A.

The ball urging spring 67 is a member for holding the lock sleeve 63 at a position where the inner peripheral surface of the shoulder portion 634 comes into contact with the ball 61 by constantly urging the lock sleeve 63 downward. In the present embodiment, the ball urging spring 67 is a compression coil spring having a diameter smaller than that of the clamp spring 59. The ball urging spring 67 is a spring having a significantly smaller (weaker) spring constant than the clamp spring 59. The ball urging spring 67 is arranged in a compressed state between the washer 69 on the upper side of the lock sleeve 63 and the upper portion 57 of the intermediate shaft 53 and the upper spring receiving portion 579.

The lock mechanism 6A configured as described above is in a locked state by changing the relative position between the ball 61 and the lock sleeve 63 in the circumferential direction around the drive shaft A1 as the intermediate shaft 53 rotates. , Can be switched between unlocked state.

The locked state is a state in which the lock mechanism 6A can lock the clamp shaft 51. As shown in FIGS. 4 and 6, the locked state can also be said to be a state in which the lock sleeve 63 holds the ball 61 on the innermost radial direction within the moving range. In the lock mechanism 6A, when the clamp shaft 51 is inserted into the intermediate shaft 53 and the ball 61 is placed in the locked state with the ball 61 engaged with the engaging groove 512 of the clamp shaft 51, the clamp shaft 51 is placed with respect to the intermediate shaft 53. It is held in a fixed state and cannot be removed from the spindle 3A. In the following, the position of the ball 61 which is the innermost in the radial direction in the moving range is also referred to as an engaging position.

The unlocked state is a state in which the locking mechanism 6A allows the clamp shaft 51 to be attached to and detached from the spindle 3A (that is, a state in which the lock is released). As shown in FIGS. 7 and 8, the unlocked state can also be said to be a state in which the lock sleeve 63 holds the ball 61 so as to be retractable radially outward from the innermost end of the ball holding hole 542. Hereinafter, the position of the ball 61 radially outside the innermost end of the ball holding hole 542 (the position shown by the dotted line in FIG. 6) is also referred to as a retracted position.

Further, the lock mechanism 6A of the present embodiment is configured to be able to temporarily hold the clamp shaft 51 in the unlocked state. The term "temporarily held" as used herein means to maintain the position of the clamp shaft 51 with respect to the spindle 3A unless an external force (typically, a force in the pulling direction by the user) is applied to the clamp shaft 51. is there. As described above, the lock sleeve 63 is constantly urged downward by the ball urging spring 67, and the inner peripheral surface of the shoulder portion 634 is radially outward from the ball holding hole 542 of the outer peripheral surface of the ball 61. It is in contact with the protruding part. As a result, the ball 61 is urged inward in the radial direction and is held in the engaged position even in the unlocked state. Therefore, the clamp shaft 51 is held by the intermediate shaft 53 via the ball 61 unless an external force that moves the ball 61 radially outward from the engaging position acts against the urging force of the ball urging spring 67. It will not come off from the spindle 3A. Hereinafter, the provisional holding state of the clamp shaft 51 is also referred to as a provisional lock state.

When the clamp shaft 51 in the provisionally locked state is pulled downward, the ball 61 is pushed by the upper end portion of the shaft portion 511 (the portion above the engaging groove 512) to resist the urging force of the ball urging spring 67. Then, the shoulder portion 634 is pushed up and moved to the retracted position. On the contrary, when the clamp shaft 51 is inserted into the intermediate shaft 53 when the lock mechanism 6A is in the unlocked state, the ball 61 is temporarily moved to the retracted position by the upper end portion of the shaft portion 511, and the upper end portion is the ball 61. The ball 61 returns to the engaging position by the urging force of the ball urging spring 67. As a result, the clamp shaft 51 is temporarily held by the intermediate shaft 53 via the ball 61.

Here, the detailed configuration of the second cam portion 55 of the intermediate shaft 53 and the first cam portion 33 of the spindle 3A will be described together.

As shown in FIGS. 5 and 9, the second cam portion 55 of the present embodiment is composed of a pair of convex portions 551. The pair of convex portions 551 are provided in an arc shape along the outer peripheral portion of the flange portion 56 and project upward. Further, the pair of convex portions 551 are arranged symmetrically with respect to the drive shaft A1. The upper surface of each convex portion 551 includes an orthogonal surface 552 and a cam surface 553. The orthogonal surface 552 is a plane orthogonal to the drive shaft A1 and constitutes a protruding end surface (upper end surface) of the convex portion 551. The cam surface 553 is an inclined surface that is inclined in the circumferential direction, and is connected to the orthogonal surface 552 on the release direction side. More specifically, the cam surface 553 is an inclined surface that inclines downward from the orthogonal surface 552 toward the release direction (direction of arrow R in FIG. 5).

As shown in FIG. 9, the first cam portion 33 of the present embodiment is composed of a pair of convex portions 331. The pair of convex portions 331 are provided in an arc shape along the inner peripheral portion of the upper end portion of the flange portion 32, and project downward. The pair of convex portions 331 are also arranged symmetrically with respect to the drive shaft A1. Note that, for convenience of explanation, FIG. 9 shows the flange portion 32 in a state where the outer peripheral side portion of the convex portion 331 is excluded, and this point is the same in other similar drawings referred to below. Further, each convex portion 331 has a shape substantially matching the convex portion 551. The lower surface of each convex portion 331 includes an orthogonal surface 332 and a cam surface 333. The orthogonal surface 332 is a plane orthogonal to the drive shaft A1 and constitutes a protruding end surface (lower end surface) of the convex portion 331. The cam surface 333 is an inclined surface that is inclined in the circumferential direction, and is connected to the orthogonal surface 332 on the clamp direction side. The cam surface 333 is an inclined surface that matches the cam surface 553 of the second cam portion 55. The cam surface 333 is an inclined surface that inclines upward from the orthogonal surface 332 in the clamping direction.

As described above, the intermediate shaft 53 is constantly urged upward with respect to the spindle 3A by the clamp spring 59 (see FIG. 4). Therefore, normally, the first cam portion 33 and the second cam portion 55 are in a state in which the lower surface of the convex portion 331 and the upper surface of the convex portion 551 are in contact with each other at least partially. The first cam portion 33 and the second cam portion 55 move the intermediate shaft 53 in the vertical direction with respect to the spindle 3A when the cam surfaces 333 and 535 rotate relative to each other in a state of being in contact with each other. Can be done. That is, the first cam portion 33 and the second cam portion 55 are configured to convert the rotation of the intermediate shaft 53 with respect to the spindle 3A around the drive shaft A1 into a linear movement of the intermediate shaft 53 with respect to the spindle 3A in the vertical direction. It can also be said that it is a motion conversion mechanism. Further, when the first cam portion 33 and the second cam portion 55 rotate relatively with the orthogonal surfaces 332 and 552 in contact with each other, only the rotation of the intermediate shaft 53 with respect to the spindle 3A is allowed. , The intermediate shaft 53 is not moved in the vertical direction with respect to the spindle 3A.

In the present embodiment, when the rotation lever 81 is rotated within a predetermined angle range from the initial position by using the first cam portion 33 and the second cam portion 55 as such a motion conversion mechanism. Can move the intermediate shaft 53 downward while rotating it with respect to the spindle 3A to release the clamping force and push the tip tool 91 downward. When the rotary lever 81 is further rotated beyond a predetermined angle range, the intermediate shaft 53 is rotated with respect to the spindle 3A to unlock the clamp shaft 51 by the lock mechanism 6A, and the spindle. It can be removed from 3A. This point will be described in detail below.

First, the operation when the clamp shaft 51 is removed from the spindle 3A (intermediate shaft 53) will be described.

As shown in FIGS. 4, 6 and 9, when the rotating lever 81 is arranged at the initial position and the clamp shaft 51 is locked by the locking mechanism 6A, the intermediate shaft 53 is attached with the clamp spring 59. Together with the clamp shaft 51, it is pushed up by force to a position where the cam surface 333 and the cam surface 553 partially abut. The tip tool 91 is pressed against the tool mounting portion 35 with the inclined surface 913 in contact with the inclined surface 353 by the head portion 515 in contact with the lower surface thereof, and is fixed to the spindle 3A. That is, the head portion 515 clamps the tip tool 91 together with the tool mounting portion 35 by the clamping force (force that pushes the tip tool 91 upward against the spindle 3A) applied by the clamp spring 59. The positions of the intermediate shaft 53 and the clamp shaft 51 with respect to the spindle 3A at this time are referred to as clamp positions. When the intermediate shaft 53 is in the clamp position, the lower end surface of the second cam portion 55 (that is, the lower end surface of the intermediate shaft 53) is slightly separated upward from the upper surface of the tip tool 91.

As described above, when the rotation lever 81 is arranged at the initial position, the protrusion 815 of the rotation lever 81 is arranged at a position away from the side surface of the recess 577 of the rotation transmission member 576. Therefore, when the user rotates the rotary lever 81 from the initial position in the release direction, only the rotary lever 81 rotates until the protrusion 815 abuts on the side surface of the recess 577. In the present embodiment, when the rotation lever 81 is rotated by approximately 45 degrees in the release direction from the initial position, the protrusion 815 comes into contact with the side surface of the recess 577.

When the user further rotates the rotation lever 81, the intermediate shaft 53 rotates around the drive shaft A1 with respect to the spindle 3A. At this time, due to the action of the cam surfaces 333 and 535, the intermediate shaft 53 moves downward against the urging force of the clamp spring 59 while rotating in the release direction. As a result, the clamping force (force that pushes the tip tool 91 upward against the spindle 3A) applied to the head portion 515 by the clamp spring 59 is released. Further, in the lowering process of the intermediate shaft 53, the lower end surface of the flange portion 56 comes into contact with the tip tool 91 from above. The intermediate shaft 53 further moves downward in that state, thereby pushing down the tip tool 91 downward. That is, the intermediate shaft 53 (flange portion 56) comes into surface contact with the upper surface of the tip tool 91 in the annular region surrounding the drive shaft A1 and pushes down the tip tool 91. When the tip tool 91 is oscillated in a state where the inclined surface 913 and the inclined surface 353 are in contact with each other and are pressed against the tool mounting portion 35 from below by the head portion 515, the tip tool 91 is fixed to the tool mounting portion 35. It may end up. Even in such a case, the intermediate shaft 53 can eliminate the stuck state of the tip tool 91 as it moves downward.

Further, in the present embodiment, the lock mechanism 6A maintains the locked state while the intermediate shaft 53 moves downward while rotating with respect to the spindle 3A in a state where the cam surfaces 333 and 535 are in contact with each other. It is configured. That is, the lock mechanism 6A maintains the locked state while the rotary lever 81 is rotated in the release direction within a predetermined angle range from the initial position. In the present embodiment, this predetermined angle range is approximately 65 degrees. While the rotation lever 81 is rotated approximately 65 degrees from the initial position, the intermediate shaft 53 moves with respect to the spindle 3A until the upper end of the cam surface 553 contacts the lower end of the cam surface 333, as shown in FIG. Rotates and moves downward. As described above, since the lock sleeve 63 is held in a state in which rotation with respect to the spindle 3A is prohibited, the intermediate shaft 53 rotates with respect to the lock sleeve 63 together with the ball 61. Even if the rotation lever 81 is rotated approximately 65 degrees from the initial position, the ball 61 held by the intermediate shaft 53 does not reach the position of the ball receiving portion 635, as shown in FIG. Therefore, despite the rotation of the intermediate shaft 53, the ball 61 is held in a state of being sandwiched between the clamp shaft 51 and the lock sleeve 63 at the engaging position, and the lock mechanism 6A maintains the locked state.

When the rotary lever 81 is rotated in the release direction beyond a position of approximately 65 degrees from the initial position, the intermediate shaft 53 rotates with respect to the spindle 3A but does not move in the vertical direction. More specifically, as shown in FIG. 12, in the intermediate shaft 53, the orthogonal surface 552 of the second cam portion 55 abuts on the orthogonal surface 332 of the first cam portion 33 of the spindle 3A by the urging force of the clamp spring 59. It is held in the vertical position.

Further, in the present embodiment, the lock mechanism 6A is configured to be switched to the unlocked state in the process of rotating the intermediate shaft 53 with respect to the spindle 3A in a state where the orthogonal surfaces 332 and 552 are in contact with each other. .. That is, the lock mechanism 6A is configured to release the lock of the clamp shaft 51 when the rotation lever 81 is rotated in the release direction beyond a predetermined angle range from the initial position. In the present embodiment, the rotary lever 81 is rotated beyond a position of approximately 65 degrees from the initial position, and when the position reaches a position of approximately 90 degrees, the lock mechanism 6A is switched to the unlocked state. When the rotation lever 81 is rotated approximately 90 degrees from the initial position, the ball 61 held by the intermediate shaft 53 faces the ball receiving portion 635 and moves to the retracted position indicated by the dotted line, as shown in FIG. It will be possible. That is, the lock mechanism 6A is switched to the unlocked state, and the clamp shaft 51 is placed in the provisionally locked state.

As shown in FIG. 13, the rotation lever 81 is further rotated in the release direction, and the second cam portion 55 is orthogonal to the second cam portion 55 due to the urging force of the clamp spring 59 until the position reaches approximately 120 degrees from the initial position. The state in which the surface 552 is in contact with the orthogonal surface 332 of the first cam portion 33 of the spindle 3A is maintained, and the intermediate shaft 53 does not move in the vertical direction. Further, as described above, in the unlocked state, the ball 61 held by the intermediate shaft 53 is held at the engaging position in a state of being in contact with the shoulder portion 634 by the urging force of the ball urging spring 67. .. Further, the length of the ball receiving portion 635 in the circumferential direction is set so as to correspond to an angle range of approximately 30 degrees about the drive shaft A1. Therefore, when the rotation lever 81 is rotated in the release direction within a range of approximately 90 degrees to 120 degrees from the initial position, the ball 61 is arranged at the engaging position and the clamp shaft is arranged as shown in FIG. It rotates together with the intermediate shaft 53 in a state of being engaged with the 51, and moves in the circumferential direction in the ball receiving portion 635. The provisional locked state of the clamp shaft 51 is more stably maintained by the frictional force of the elastic member 513 attached to the lower end of the shaft portion 511.

As described above, in the present embodiment, the lock mechanism 6A is placed in the unlocked state regardless of the position of the rotary lever 81 within the range of approximately 90 degrees to 120 degrees from the initial position. Therefore, the user rotates the rotary lever 81 to an arbitrary position within this range and pulls the clamp shaft 51 in the provisionally locked state downward to move the tip tool 91 and the clamp shaft 51 to the spindle 3A and the clamp shaft 51. It can be removed from the intermediate shaft 53. Further, since the intermediate shaft 53 is held at a vertical position where the orthogonal surface 552 abuts on the orthogonal surface 332, the intermediate shaft 53 moves in the vertical direction even if the user stops the operation of the rotation lever 81. There is no such thing. Therefore, the user can easily remove the clamp shaft 51 and the tip tool 91.

The operation when the clamp shaft 51 is attached to the spindle 3A (intermediate shaft 53) and the tip tool 91 is clamped is basically the reverse of the operation at the time of removal.

Specifically, the user rotates the rotary lever 81 to an arbitrary position within a range of approximately 90 degrees to 120 degrees from the initial position to unlock the lock mechanism 6A. Then, the clamp shaft 51 inserted through the tip tool 91 is inserted into the intermediate shaft 53. The upper end of the shaft portion 511 abuts on the ball 61 from below, and the ball 61 is temporarily moved to the retracted position. When the upper end portion gets over the ball 61, the ball 61 returns to the engaging position by the urging force of the ball urging spring 67. As a result, the clamp shaft 51 is temporarily locked.

From this state, when the user rotates the rotary lever 81 toward the initial position in the clamp direction, the lock mechanism 6A is switched to the locked state. Further, when the rotation lever 81 is rotated in the clamp direction, the contact state of the first cam portion 33 and the second cam portion 55 is changed from the state in which the orthogonal surfaces 332 and 552 are in contact with each other. You can switch to the state of contact. When the rotation lever 81 is rotated in the clamp direction, the protrusion 815 abuts on the side surface of the recess 577, which is opposite to the side surface when the rotation lever 81 is rotated in the release direction. Therefore, the state of the lock mechanism 6A and the contact state of the first cam portion 33 and the second cam portion 55 change when the rotation lever 81 is closer to the initial position than when it is rotated in the release direction. It is when it is rotated to the position.

When the user further rotates the rotation lever 81 in the clamp direction, the intermediate shaft 53 moves upward while rotating. In the intermediate shaft 53 and the clamp shaft 51, the protrusion 815 was separated from the side surface of the recess 577 after the rotary lever 81 was returned to the initial position by the urging force of the clamp spring 59 and the action of the cam surfaces 333 and 535. In this state, it moves upward while rotating and returns to the clamp position.

As described above, in the vibration tool 1A of the present embodiment, when the rotary lever 81 is rotated in the release direction by the user, the intermediate shaft 53 is moved by the first cam portion 33 and the second cam portion 55. It is moved downward with respect to the spindle 3A, and in the process, the flange portion 56 pushes the tip tool 91 downward. Therefore, even if the tip tool 91 is stuck to the lower end portion (tool mounting portion 35) of the spindle 3A, the user only needs to rotate the rotation lever 81 in the release direction to rotate the tip tool 91. Can be easily removed. Since the clamp shaft 51 is removable from the spindle 3A, the user can remove the clamp shaft 51 from the spindle and replace the tip tool 91.

Further, the spring receiving portion 579 that receives the upper end of the clamp spring 59 is integrated with the intermediate shaft 53 in conjunction with the rotation of the rotating lever 81 in the releasing direction against the upward urging force of the clamp spring 59. It is configured to move downward and release the clamping force. Then, the intermediate shaft 53 (flange portion 56) pushes down the tip tool 91 downward with the clamping force released. Therefore, it is not necessary to apply an excessive pushing force to the tip tool 91.

Further, the lock mechanism 6A is configured to release the lock of the clamp shaft 51 in conjunction with the rotation of the rotation lever 81 in the release direction. Therefore, the user can make the vibrating tool 1A perform both the release operation of the clamp force and the unlock operation of the clamp shaft 51 by only a single operation of rotating the rotation lever 81 in the release direction. .. In particular, in the present embodiment, the intermediate shaft 53 is operated by the first cam portion 33 and the second cam portion 55 in conjunction with the rotation lever 81 being rotated in the release direction within a predetermined angle range from the initial position. Is moved downward with respect to the spindle 3A to release the clamping force and push down the tip tool 91. Further, as the rotary lever 81 is rotated in the release direction beyond a predetermined angle range, the intermediate shaft 53 rotates with respect to the spindle 3A, and the lock mechanism 6A locks the clamp shaft 51. To cancel. Therefore, the user can release the clamping force and push down the tip tool 91 by only a single operation of rotating the rotating lever 81 in the releasing direction beyond a predetermined angle range, and then the clamp shaft 51 The vibrating tool 1A can be made to perform an efficient series of operations of unlocking.

Further, in the present embodiment, the lock mechanism 6A is configured to temporarily hold the clamp shaft 51 in an unlocked state in which the clamp shaft is unlocked. Therefore, it is possible to prevent the clamp shaft 51 from falling off from the spindle 3A when the clamp shaft 51 is unlocked. Further, when the clamp shaft 51 is attached, the user can temporarily lock the clamp shaft 51, rotate the rotation lever 81 in the clamp direction, and lock the clamp shaft 51 by the lock mechanism 6A. Therefore, the user does not need to hold the clamp shaft 51 so as not to fall off from the spindle 3A until the clamp shaft 51 is locked, and the operability is improved.

[Second Embodiment]
Hereinafter, the vibration tool 1B according to the second embodiment will be described with reference to FIGS. 15 to 20. The vibrating tool 1B of the present embodiment is different from the vibrating tool 1A of the first embodiment (see FIGS. 1 to 3) mainly in a part of the configuration of the spindle 3B and the clamp mechanism 5B. On the other hand, the other configurations of the vibrating tool 1B are substantially the same as those of the vibrating tool 1A (including the case where the shape is slightly different). Therefore, in the following, substantially the same configuration as the vibration tool 1A will be designated by the same reference numerals, and the illustration and description will be omitted or simplified, and different configurations will be mainly described.

As shown in FIG. 15, the spindle 3B of the present embodiment is substantially the same as the spindle 3A of the first embodiment (see FIGS. 3 and 4) except for the flange portion 320 (specifically, the first cam portion 330). Has the same configuration. The detailed configuration of the first cam unit 330 will be described later together with the second cam unit 550.

Hereinafter, the configuration of the clamp mechanism 5B of the present embodiment will be described. In the present embodiment, the clamp mechanism 5B includes a clamp shaft 510, an intermediate shaft 530, a clamp spring 59, and a lock mechanism 6B. Hereinafter, these configurations will be described in order.

First, the clamp shaft 510 will be described. As shown in FIG. 16, the upper end of the clamp shaft 510 of the present embodiment is provided with a plurality of recesses 517 in addition to the engagement groove 512. The plurality of recesses 517 are provided at the upper end of the engaging groove 512 at intervals in the circumferential direction. The recess 517 is configured to engage a part of the ball 61 when the ball 61 is arranged in the engaging groove 512 to restrict the ball 61 from moving in the circumferential direction.

Next, the intermediate shaft 530 will be described. As shown in FIGS. 15, 17, and 18, the intermediate shaft 530 is arranged coaxially with the spindle 3B and extends in the vertical direction to hold the clamp shaft 510, similarly to the intermediate shaft 53 of the first embodiment. It is configured to do. In the present embodiment, the intermediate shaft 530 is formed as a long cylindrical member and includes a lower portion 540 and an upper portion 570.

The lower portion 540 is a portion into which the shaft portion 511 of the clamp shaft 510 is inserted, and includes a lock portion 541, a sliding portion 545, a second cam portion 550, and a flange portion 560.

In the present embodiment, the second cam portion 550 is provided not on a part of the flange portion 560 but on the upper side of the flange portion 560 (that is, between the sliding portion 545 and the flange portion 560 in the vertical direction). The detailed configuration of the second cam portion 550 will be described later.

In the present embodiment, the flange portion 560 is not provided with a cam surface 553 (see FIG. 5) like the flange portion 56 of the first embodiment. Therefore, the outer diameter of the flange portion 560 is set to be smaller than the outer diameter of the flange portion 56 of the first embodiment. Further, the height of the flange portion 560 in the vertical direction is also smaller than that of the flange portion 56. However, the function of the flange portion 560 is the same as that of the flange portion 56. That is, the flange portion 560 (specifically, the annular lower end surface of the flange portion 560) abuts on the tip tool 91 from above in the process of the intermediate shaft 530 moving downward with respect to the spindle 3B, and the tip tool 91 is pressed. Functions as a push-down part.

The upper portion 570 is a cylindrical portion connected to the upper end of the lock portion 541 and extending upward. The upper end portion of the upper portion 570 is configured as a female screw portion. A bolt 581 for fixing the rotation transmission member 58 is fastened to the female screw portion.

In the present embodiment, the rotation transmission member 58 is fixed to the intermediate shaft 530 by a bolt 581 fastened to the female screw portion of the upper portion 570. A pair of recesses are formed on the outer circumference of the upper end portion of the intermediate shaft 530 (see FIG. 18). Although detailed illustration is omitted, a pair of convex portions provided on the inner peripheral side of the rotation transmission member 58 are fitted into these pair of concave portions, and the bolt 581 is fastened to the rotation transmission member 58. Is integrated with the intermediate shaft 530.

The rotation transmission member 58 is configured to transmit the rotation of the rotation lever 81 to the intermediate shaft 530, similarly to the rotation transmission member 576 (see FIG. 4) of the first embodiment. More specifically, the rotation transmission member 58 engages with the protrusion 815 and rotates together with the intermediate shaft 530 as the rotation lever 81 rotates.

As shown in FIG. 15, in the present embodiment, the intermediate shaft 530 can rotate to the inner housing 103 via a bearing (specifically, a ball bearing) 583 fixed to the rotation transmission member 58. It is supported. More specifically, the front end portion 104 of the inner housing 103 is formed in a cylindrical shape. A cylindrical holding sleeve 105 is fixed to the upper end of the front end 104. In the bearing 583, the inner ring is fixed to the outer circumference of the rotation transmission member 58 (specifically, the cylindrical portion of the rotation transmission member 58 fitted to the intermediate shaft 530), and the outer ring is the inner peripheral surface of the holding sleeve 105. It is arranged between the intermediate shaft 530 and the inner housing 103 so as to be slidable in the vertical direction along the shaft. Therefore, the intermediate shaft 530, the rotation transmission member 58, and the bearing 583 can be integrally moved in the vertical direction with respect to the inner housing 103 and the spindle 3B while the bearing 583 slides along the holding sleeve 105.

Further, as shown in FIGS. 15 and 17, in the present embodiment, a spring receiving portion is formed between the spindle 3B (specifically, the bearing 301 in which the inner ring is fixed to the spindle 3B) and the rotation transmission member 58. 37, a clamp spring 59, a spring receiving portion 579, and a thrust bearing 585 are interposed. Also in the present embodiment, the clamp spring 59 is arranged in a compressed state between the spring receiving portion 37 and the spring receiving portion 579, and the rotation transmitting member 58 and the rotation transmitting member 58 and the thrust bearing 585 are interposed via the spring receiving portion 579 and the thrust bearing 585. The intermediate shaft 530 is constantly urged upward with respect to the spindle 3B. In the present embodiment, the thrust needle bearing is adopted as the thrust bearing 585.

The lock mechanism 6B of the present embodiment has a different arrangement of the ball urging spring 67 from the lock mechanism 6A of the first embodiment (see FIGS. 4 and 6), but other configurations are substantially different from the lock mechanism 6A. Is the same as. As shown in FIG. 17, in the present embodiment, the ball urging spring 67 is located between the retaining ring 673 fixed to the intermediate shaft 530 below the spring receiving portion 579 and the shoulder portion 634 of the lock sleeve 63. The lock sleeve 63 is always urged downward with respect to the intermediate shaft 530, which is arranged in a compressed state.

Hereinafter, the configurations of the first cam portion 330 and the second cam portion 550 will be described. As described above, the first cam portion 33 and the second cam portion 55 (see FIG. 9) of the first embodiment are configured as a cam mechanism that utilizes an inclined surface (cam surface 333, 535). On the other hand, in the present embodiment, the first cam portion 330 and the second cam portion 550 are configured as a cam mechanism utilizing an inclined groove.

More specifically, as shown in FIGS. 17, 19 and 20, the first cam portion 330 is provided inside the upper end portion of the flange portion 320 of the spindle 3B. The first cam portion 330 is composed of a pair of cam grooves 335 formed on the inner peripheral portion of the flange portion 320. The pair of cam grooves 335 are arranged symmetrically with respect to the drive shaft A1. The cam groove 335 is an inclined groove that inclines in the circumferential direction around the drive shaft A1, and inclines downward to a predetermined boundary toward the release direction (arrow R direction in the figure), and inclines upward when the boundary is crossed. It is configured to do. More specifically, as shown in FIGS. 19 and 20, the cam groove 335 is downward from the end on the clamp direction (arrow C direction in the figure) side toward the release direction (arrow R direction in the figure). It is configured so that it is tilted and only the end on the release direction side is tilted upward. Hereinafter, the portion of the cam groove 335 that inclines downward from the end on the clamp direction side is referred to as a first inclined portion 336, and the end portion on the release direction side (a portion that inclines upward) is also referred to as a second inclined portion 337. The length of the second inclined portion 337 roughly corresponds to the diameter of the ball 555 described later. That is, the second inclined portion 337 is set to a size that just fits the ball 555.

Although detailed illustration is omitted, in the present embodiment, the rotary lever 81 is arranged so as to be rotatable in the clockwise direction when viewed from above from the initial position. That is, when the clamp of the tip tool 91 is released, the rotary lever 81 is rotated in the direction opposite to that of the first embodiment. Therefore, in the present embodiment, the clockwise direction is the release direction and the counterclockwise direction is the clamp direction when viewed from above the rotary lever 81.

As shown in FIGS. 17 and 18, the second cam portion 550 is provided above the flange portion 560 of the intermediate shaft 530. In the present embodiment, the second cam portion 550 includes a pair of balls 555. The pair of balls 555 are arranged symmetrically with respect to the drive shaft A1. The ball 555 is partially fitted in a recess having a semicircular cross section formed on the outer peripheral portion of the intermediate shaft 530, and approximately half of the ball 555 protrudes from the recess outward in the radial direction of the intermediate shaft 530. .. The portion of the ball 555 that protrudes from the recess has an outer surface (curved surface (spherical surface)) that matches the inner surface of the cam groove 335 of the first cam portion 330. The ball 555 is arranged in the cam groove 335 and is slidable in the cam groove 335.

By adopting the first cam portion 330 and the second cam portion 550 having such a configuration, the diameter of the flange portion 320 provided with the first cam portion 330 in the spindle 3B is made smaller than that in the first embodiment. can do. This is because when the cam surfaces 333 and 535 (see FIG. 9) that are in sliding contact with each other in the vertical direction are used, the spaces provided on the inner and outer sides in the radial direction with respect to the cam surfaces 333 and 535 are not required. Therefore, in the first embodiment, as shown in FIG. 3, the flange portion 32 is arranged below the bearing 302, whereas in the present embodiment, as shown in FIG. 15, the flange portion 320 of the flange portion 320. The upper end is supported by a bearing 302. The first cam portion 330 is arranged inside the bearing 302 in the radial direction. Due to such an arrangement, the spindle 3B is shortened in the vertical direction as compared with the first embodiment.

The first cam portion 330 and the second cam portion 550 move the intermediate shaft 530 in the vertical direction with respect to the spindle 3B when the ball 555 rotates relatively in the cam groove 335 in a sliding state. be able to. That is, the first cam portion 330 and the second cam portion 550 are configured to convert the rotation of the intermediate shaft 530 with respect to the spindle 3B around the drive shaft A1 into a linear movement of the intermediate shaft 530 with respect to the spindle 3B in the vertical direction. It is a motion conversion mechanism. As described above, the cam groove 335 includes the first inclined portion 336 and the second inclined portion 337 having different inclination directions. Therefore, when the ball 555 crosses the boundary between the first inclined portion 336 and the second inclined portion 337, the moving direction of the intermediate shaft 530 with respect to the spindle 3B is switched in the opposite direction.

In the present embodiment, by using the first cam portion 330 and the second cam portion 550 as such a motion conversion mechanism, the rotary lever 81 is within a predetermined angle range from the initial position as in the first embodiment. When rotated by, the intermediate shaft 530 can be moved downward while rotating with respect to the spindle 3B to release the clamping force and push the tip tool 91 downward. When the rotary lever 81 is further rotated beyond a predetermined angle range, the intermediate shaft 530 is rotated with respect to the spindle 3B, the clamp shaft 510 is unlocked by the lock mechanism 6B, and the spindle is used. It can be removed from 3B.

The operation of the vibrating tool 1B will be described below.

As shown in FIG. 15, when the rotary lever 81 is arranged at the initial position and the clamp shaft 510 is locked by the lock mechanism 6B, the intermediate shaft 530 is subjected to the urging force of the clamp spring 59 to cause the clamp shaft 510. Is held in the clamp position with. At this time, the ball 555 is arranged in the first inclined portion 336 (see FIGS. 19 and 20). The head portion 515 clamps the tip tool 91 together with the tool mounting portion 35 by the clamping force (force that pushes the tip tool 91 upward against the spindle 3A) applied by the clamp spring 59. When the motor 21 is driven in this state, the spindle 3B is reciprocally rotated, and the tip tool 91 fixed to the spindle 3B is oscillated.

As described above, in the locked state, the ball 61 of the locking mechanism 6B is arranged in the engaging groove 512 and partially engages with the recess 517 (see FIG. 16) provided in the clamp shaft 510 to rotate the circumference. It is restricted to move in the direction. As a result, it is possible to prevent the ball 61 from slipping in the engaging groove 512 when the spindle 3B reciprocates. As a result, heat generation due to friction can be reduced.

Further, as described above, in the present embodiment, the rotation transmission member 58 is rotatably supported by the inner housing 103 (front end portion 104) via the bearing 583. In general, the upper end and the lower end of the clamp spring 59 are often ground flat in order to stabilize the contact state with the lower surface of the spring receiving portion 579 and the upper surface of the spring receiving portion 37, respectively. However, due to the grinding error, the clamp spring 59, the spring receiving portion 579, and the intermediate shaft 530 may be tilted. On the other hand, as in the present embodiment, by interposing the bearing 583 between the intermediate shaft 530 and the inner housing 103 in the radial direction, the intermediate shaft 530 is smooth regardless of the grinding error of the clamp spring 59 or the like. It is possible to effectively prevent the clamp spring 59, the spring receiving portion 579, and the intermediate shaft 530 from tilting with respect to the drive shaft A1 while ensuring sufficient rotation. Therefore, the swinging operation of the tip tool 91 is stable. Further, since the bearing 583 closes the gap between the inner housing 103 and the rotation transmission member 58, it is possible to prevent foreign matter such as dust from entering the inner housing 103.

When the user removes the clamp shaft 510 from the spindle 3B (intermediate shaft 530), the user rotates the rotation lever 81 from the initial position in the release direction. The rotation lever 81 rotates the intermediate shaft 530 around the drive shaft A1 via the rotation transmission member 58 as the rotation lever 81 rotates. At this time, since the ball 555 slides in the first inclined portion 336 that inclines downward in the releasing direction, the intermediate shaft 530 rotates in the releasing direction and resists the urging force of the clamp spring 59. Move down. As a result, the clamping force is released. Further, in the lowering process of the intermediate shaft 530, the lower end surface of the flange portion 560 comes into contact with the tip tool 91 from above, and pushes the tip tool 91 downward.

In the process described above, the rotation transmission member 58 and the intermediate shaft 530 rotate with respect to the clamp spring 59, the spring receiving portion 579, and the spindle 3B. On the other hand, in the present embodiment, the thrust bearing 585 arranged between the rotation transmission member 58 (specifically, the inner ring of the bearing 583) and the spring receiving portion 579 is the rotation transmission member 58 and the spring receiving portion 579. Friction between the bearing and the shaft 3B can be reduced, and smooth relative rotation of the intermediate shaft 530 with respect to the spindle 3B can be realized.

Further, the lock mechanism 6B locks the ball 555 while the intermediate shaft 530 moves downward while rotating with respect to the spindle 3B while the ball 555 is arranged in the first inclined portion 336 of the cam groove 335. It is configured to maintain. That is, the lock mechanism 6B maintains the locked state while the rotary lever 81 is rotated in the release direction within a predetermined angle range from the initial position. This predetermined angle range is approximately 90 degrees. While the rotary lever 81 is rotated approximately 90 degrees from the initial position, the intermediate shaft 530 is connected to the spindle 3A until the ball 555 reaches the boundary between the first inclined portion 336 and the second inclined portion 337 of the cam groove 335. Rotates with respect to and moves downward. During this time, the intermediate shaft 530 rotates with respect to the lock sleeve 63 together with the ball 61, but the ball 61 is held in a state of being sandwiched between the clamp shaft 510 and the lock sleeve 63 at the engaging position (FIGS. 6 and 6). 11), the locking mechanism 6B maintains the locked state.

When the rotation lever 81 is rotated in the release direction beyond the position of approximately 90 degrees from the initial position, the intermediate shaft 530 further rotates with respect to the spindle 3B, and the ball 555 is the first inclined portion of the cam groove 335. Overcome the boundary between 336 and the second inclined portion 337 (see FIGS. 19 and 20). Since the intermediate shaft 530 is constantly urged upward by the clamp spring 59, when the ball 555 enters the second inclined portion 337 that inclines upward in the release direction, the intermediate shaft 530 rotates slightly upward. Move to. When the ball 555 comes into contact with the end of the cam groove 335 on the release direction side, further rotation of the intermediate shaft 530 is restricted.

Further, the ball 61 held by the intermediate shaft 530 faces the ball receiving portion 635 and can move to the retracted position (see FIG. 8). That is, the lock mechanism 6B is switched to the unlocked state, and the clamp shaft 510 is placed in the provisionally locked state. The user can remove the tip tool 91 and the clamp shaft 510 from the spindle 3B and the intermediate shaft 530 by pulling the clamp shaft 510 in the provisionally locked state downward.

As described above, in the present embodiment, the lock mechanism 6B is switched to the unlocked state when the ball 555 crosses the boundary between the first inclined portion 336 and the second inclined portion 337. Since the user can detect the upward movement of the intermediate shaft 530 via the rotating lever 81, it is possible to easily recognize the switching of the lock mechanism 6B to the unlocked state. In the present embodiment, the second inclined portion 337 is configured to have a length sufficient to accommodate the ball 555, so that the rotation of the intermediate shaft 530 is restricted as soon as the ball 555 crosses the boundary. It will be. Therefore, the user can also recognize the switching of the lock mechanism 6B to the unlocked state by sensing the rotation stop of the intermediate shaft 530 via the rotation lever 81. Further, since the first inclined portion 336 and the second inclined portion 337 are inclined in opposite directions in the circumferential direction, the ball 555 is inclined to the second inclination unless it overcomes the boundary against the urging force of the clamp spring 59. It is not possible to move from the portion 337 to the first inclined portion 336. As a result, the unlocked state of the lock mechanism 6B can be stably maintained.

The operation when the clamp shaft 510 is attached to the spindle 3B (intermediate shaft 530) and the tip tool 91 is clamped is basically the reverse of the operation at the time of removal. Specifically, the user inserts the clamp shaft 510 into the intermediate shaft 530, puts the clamp shaft 510 in a provisionally locked state, and then rotates the rotation lever 81 toward the initial position in the clamp direction. When the ball 555 crosses the boundary and enters the first inclined portion 336, the lock mechanism 6B is switched to the locked state. When the user further rotates the rotation lever 81 in the clamp direction, the intermediate shaft 530 moves upward while rotating while the ball 555 slides in the first inclined portion 336. The intermediate shaft 530 and the clamp shaft 510 move upward while rotating to the clamp position after the rotation lever 81 is returned to the initial position by the urging force of the clamp spring 59 and the action of the first inclined portion 336. Return. Also in this process, the thrust bearing 585 realizes smooth relative rotation of the intermediate shaft 530.

The correspondence between each component of the above embodiment and each component of the claim is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention. Each of the vibrating tools 1A and 1B is an example of a "working tool". The housing 10 is an example of a “housing”. Each of the spindles 3A and 3B is an example of a "spindle". The drive shaft A1 is an example of a "drive shaft". Each of the clamp shafts 51 and 510 is an example of a "clamp shaft". The shaft portion 511 and the head portion 515 are examples of the “shaft portion” and the “head portion”, respectively. The clamp spring 59 is an example of a “biasing member”. The rotary lever 81 is an example of an “operating member”. The first cam portion 33 and the second cam portion 55 are examples of the “motion conversion mechanism”. Each of the intermediate shafts 53 and 530 (flange portions 56 and 560) is an example of a "pushing member". The spring receiving portion 579 is an example of a “release member”. Each of the lock mechanisms 6A and 6B is an example of a "lock mechanism". The lower portion 54 of the intermediate shaft 53 and 530 is an example of a "cylindrical portion". The seal member 39 is an example of the “first seal member”. The elastic member 546 is an example of the “second seal member”. The first cam portion 330 and the second cam portion 550 are other examples of the "motion conversion mechanism", and each is an example of the "first cam portion" and the "second cam portion". The cam groove 335 is an example of an "inclined groove". The ball 555 is an example of an “engagement portion”. The bearing 583 is an example of a "bearing member". The thrust bearing 585 is an example of a “friction reducing member”.

The above embodiment is merely an example, and the work tool according to the present invention is not limited to the configurations of the vibrating tools 1A and 1B illustrated. For example, the changes illustrated below can be made. In addition, only one or a plurality of these changes may be adopted in combination with the vibration tools 1A and 1B shown in the embodiments, or the invention described in each claim.

The rotary lever 81 may be rotatably arranged around the drive shaft A1, and for example, its shape, arrangement, support structure, and engagement structure with the intermediate shaft 53 can be appropriately changed.

Configuration of clamp mechanisms 5A and 5B (for example, shape, arrangement, support structure of clamp shafts 51, 510, clamp spring 59, intermediate shaft 53, 530, constituent members, shapes, arrangement, support structure, etc. of lock mechanisms 6A, 6B) Can be changed as appropriate. The following is an example of modifications that can be adopted.

For example, the clamp shafts 51 and 510 may be urged directly upward with respect to the spindles 3A and 3B by the clamp spring 59 or another urging member rather than via the intermediate shafts 53 and 530. .. Further, the clamp shafts 51 and 510 may not be removable from the spindles 3A and 3B as long as they are constantly urged upward and supported so as to be movable in the vertical direction with respect to the spindles 3A and 3B. In this case, the lock mechanisms 6A and 6B may be omitted. Instead of the clamp spring 59, for example, a tension coil spring, a torsion spring, a disc spring, or a rubber spring may be adopted.

In the above embodiment, the intermediate shafts 53 and 530 have a plurality of functions (a function of pushing down the tip tool 91 in conjunction with rotation of the rotating lever 81 in the release direction, and first cam portions 33 and 330 of the spindles 3A and 3B. In cooperation with, the function of converting the rotation of the intermediate shaft 53, 530 around the drive shaft A1 into a linear movement in the vertical direction, the function of holding the clamp shaft 51, 510 via the ball 61, the lock mechanism 6A, It is configured to exert a function of switching 6B between a locked state and an unlocked state, a function of receiving the urging force of a clamp spring 59, and the like). However, the intermediate shafts 53 and 530 need not perform all of these functions. Moreover, these functions may be realized by a plurality of members.

For example, the intermediate shafts 53 and 530 (specifically, the flange portions 56 and 560) may have only the function of pushing down the tip tool 91 in conjunction with the rotation of the rotary lever 81 in the release direction. The shapes of the flange portions 56 and 560 can be changed as appropriate, but in order to more reliably eliminate the sticking of the tip tool 91, the flange portions 56, 560 and the tip tool 91 are plurality of around the clamp shaft 51. It is preferable to make contact at a location, more preferably contact so as to surround the clamp shaft 51 in the circumferential direction, and further preferably surface contact. Further, for example, in conjunction with the rotation of the rotation lever 81 in the release direction, the spring receiving portion 579 is pushed downward independently of the intermediate shafts 53 and 530, and the clamp shafts 51 and 510 (intermediate shafts 53, The upward urge on 530) may be lifted.

In the second embodiment, the bearing 583 arranged between the intermediate shaft 530 (rotation transmission member 58) and the inner housing 103 is changed to a bearing other than a ball bearing (for example, another type of rolling bearing or sliding bearing). It may be omitted or it may be omitted.

In the second embodiment, the thrust bearing 585 arranged between the rotation transmission member 58 and the spring receiving portion 579 may be changed to a thrust bearing other than the needle bearing (for example, another type of thrust rolling bearing). However, this thrust bearing 585 may be omitted. Further, instead of the thrust bearing 585, even if a member (for example, a thrust washer) capable of reducing friction between the rotation transmitting member 58 and the spring receiving portion 579 and realizing smooth relative rotation of these members is arranged. Good. Further, when the clamp spring 59 rotates together with the rotation transmission member 58, the thrust bearing 585 (or another bearing or friction reducing member) is not the rotation transmission member 58 and the spring receiving portion 579, but the spring receiving portion. It may be arranged between 37 and the spindle 3B (inner ring of bearing 301).

In the above embodiment, the first cam as a cam mechanism that utilizes an inclined surface as a motion conversion mechanism that moves the intermediate shafts 53 and 530 in the vertical direction in conjunction with the rotation of the rotation lever 81 around the drive shaft A1. The portions 33 and the second cam portion 55, and the first cam portion 330 and the second cam portion 550 as a cam mechanism utilizing the inclined groove are exemplified. However, such a motion conversion mechanism can be changed as appropriate.

For example, the first cam portion 33 and the second cam portion 55 each have cam surfaces 333 and 535 which are inclined surfaces, but only one of them may have an inclined surface. Further, the first cam portion 33 and the second cam portion 55 may be provided with inclined surfaces inclined in the opposite directions to the cam surfaces 333 and 535, respectively, instead of the orthogonal surfaces 332 and 552. Contrary to the second embodiment, the first cam portion 330 is provided with an inclined groove, and the second cam portion 550 has a curved surface that matches a part of the inclined groove, and an engaging portion that engages with the inclined groove ( For example, a ball or a convex portion) may be provided. In the cam groove 335, the length of the second inclined portion 337 may be larger than the diameter of the ball 555. Further, a groove extending in the circumferential direction on a plane orthogonal to the drive shaft A1 may be further connected to the release direction side of the second inclined portion 337. Alternatively, the cam groove 335 (inclined groove) may have only the first inclined portion 336 that inclines downward toward the release direction. Further, a cam mechanism using a spiral groove or a screw mechanism using a screw groove may be adopted. Further, the motion conversion mechanism does not necessarily have to be provided on the spindles 3A and 3B and the intermediate shafts 53 and 530 as in the above embodiment. For example, the housing 10 (inner housing 103) may be provided with the first cam portions 33 and 330, and the second cam portions 55 and 550 may be provided at the upper end portions of the intermediate shafts 53 and 530.

The motion conversion mechanism may directly convert the rotation of the rotation lever 81 into the vertical movement of the intermediate shafts 53 and 530, or may convert it via another member. For example, a spiral inclined groove is formed at the upper end of the rotation transmitting member 576, and the protrusion 815 slides in the inclined groove as the rotation lever 81 rotates, so that the intermediate shafts 53 and 530 move up and down. It may be moved in the direction. Further, an intervening member configured to engage with the rotary lever 81 and rotate and move in the vertical direction may be arranged between the rotary lever 81 and the intermediate shafts 53 and 530. Then, the intermediate shafts 53 and 530 may be moved in the vertical direction by the intervening member.

In the above embodiment, the lock mechanisms 6A and 6B lock the clamp shafts 51 and 510 using the three balls 61 held by the lock sleeve 63, but the number of balls 61 may be other than three. Further, in the above embodiment, the lock sleeve 63 cannot rotate with respect to the spindles 3A and 3B, and the rotation of the intermediate shafts 53 and 530 causes the ball 61 and the lock sleeve 63 to move relative to each other in the circumferential direction, resulting in a locked state. The unlocked state can be switched. However, the intermediate shaft 53 is configured to move only in the vertical direction with respect to the spindles 3A and 3B, and the lock sleeve 63 rotates with respect to the spindles 3A and 3B in conjunction with the rotation of the rotation lever 81. It may be configured to be possible. The relative movement direction of the ball 61 and the lock sleeve 63 may be the vertical direction instead of the circumferential direction. Further, instead of the ball 61, a plurality of clamp members each having a plurality of teeth may be adopted. In this case, the clamp shafts 51 and 510 are provided with a plurality of grooves that can be engaged with the teeth of the clamp member. The clamp member is held movably in the radial direction, for example by an annular collar. Further, the lock mechanisms 6A and 6B may be arranged inside the spindles 3A and 3B, for example, instead of being arranged above the spindles 3A and 3B.

The configuration in which the locking mechanisms 6A and 6B temporarily hold the clamp shaft 51 in the unlocked state can also be appropriately changed. For example, in the unlocked state, the ball 61 (or clamp member) is radially urged instead of indirectly urging the ball 61 in the radial direction by urging the lock sleeve 63 downward by the ball urging spring 67. An elastic member (spring, O-ring, etc.) that directly biases the inside may be adopted.

The configurations (for example, shape, support structure, etc.) of the spindles 3A and 3B are not limited to the examples of the above embodiments, and may be changed as appropriate. For example, in the above embodiment, the tool mounting portion 35 has a recess 351 corresponding to a tip tool 91 having a convex portion 911. Then, the tip tool 91 is fixed to the tool mounting portion 35 in a state where the inclined surface 913 is in contact with the inclined surface 353 of the tool mounting portion 35. However, the tool mounting portion 35 may have a flat lower surface and may have a configuration in which a tip tool having a flat upper surface can be fixed. In this case, in order to position the tip tool on the tool mounting portion 35, the tool mounting portion 35 and the tip tool 91 may be provided with protrusions and fitting holes, respectively. In this case, the protrusions and the fitting holes may be provided with inclined surfaces that are inclined with respect to the drive shaft A1 and are consistent with each other, similar to the inclined surface 353 and the inclined surface 913 of the above embodiment.

The configurations of the housing 10, the motor 21, and the transmission mechanism 4 (for example, the shape, the internal structure to be accommodated, the arrangement, etc.) can be changed as appropriate. For example, the housing 10 does not have to be a vibration-proof housing including an elastically connected outer housing 101 and an inner housing 103, and may be a housing having a one-layer structure. Further, for example, the motor 21 may be an AC motor. The motor 21 may be housed in the grip portion 15 so that the rotation shaft A2 of the output shaft 211 is orthogonal to the drive shaft A1.

Further, in view of the purpose of the present invention, the above-described embodiment and its modifications, the following aspects are constructed. The following embodiments may be adopted independently or in combination with the vibrating tool 1A shown in the embodiments, the above modifications, or the invention described in each claim.

[Aspect 1]
The operating member is configured to rotate the pushing member around the drive shaft with respect to the spindle as it rotates.
The motion conversion mechanism is configured to convert the rotation of the pressing member into the linear movement of the pressing member in the vertical direction.

[Aspect 2]
The push-down member is a long member that is inserted through the spindle and extends in the vertical direction, and is configured to push down the tip tool at the lower end portion.
The operating member is configured to engage with the upper end of the pushing member to rotate the pushing member.

[Aspect 3]
The lock mechanism is switched between a first state in which the clamp shaft is detachably locked from the spindle and a second state in which the lock is released in conjunction with the rotation of the pressing member. It is configured.
[Aspect 4]
The cam mechanism includes a first cam portion having the inclined surface or the inclined groove, and a second cam portion configured to be slidable along the inclined surface or the inclined portion.
The push-down member is a portion of the inclined surface or the inclined groove in which the second cam portion inclines downward as it goes toward the first direction as the operating member rotates in the first direction. It is configured to move downward while rotating while sliding, and to move upward while rotating when the second cam portion crosses the boundary.
The first cam portion 330 and the second cam portion 550 of the above embodiment are examples of the "first cam portion" and the "second cam portion" in this embodiment, respectively.
[Aspect 5]
The first cam portion is the inclined groove and
The second cam portion is a ball or a convex portion having a curved surface that matches the inner surface of the inclined groove.
The portion of the inclined surface or the inclined groove that inclines upward toward the first direction has a size substantially corresponding to the ball or the convex portion.
The ball 555 of the above embodiment is an example of the "ball" in this embodiment.
[Aspect 6]
The locking mechanism provides a portion of the inclined surface or the inclined groove in which the second cam portion inclines downward as it goes toward the first direction as the operating member rotates in the first direction. It is configured to be maintained in the first state during sliding, and to be switched to the second state when the second cam portion crosses the boundary.

[Aspect 7]
The urging member urges the pushing member upward with respect to the spindle, and the clamp shaft fixed to the pushing member by the locking mechanism is moved upward via the pushing member. It is configured to be urged.

[Aspect 8]
At least a portion of the push-down member is disposed between the clamp shaft and the spindle in the radial direction with respect to the drive shaft.
The motion conversion mechanism includes a first portion provided on the inner peripheral portion of the spindle and a second portion provided on the outer peripheral portion of the pressing member.
Each of the first cam portions 33 and 330 of the above embodiment is an example of the "first portion" in this embodiment. Each of the second cam portions 55 and 550 is an example of the "second portion" in this embodiment.

[Aspect 9]
The motion conversion mechanism
A cam mechanism that uses an inclined surface or an inclined groove, or a screw mechanism that uses a screw groove.
It includes a first portion provided on the housing or the spindle and a second portion provided on the pressing member.
The first cam portion 33 and the second cam portion 55 of the first embodiment are examples of the "cam mechanism" in the present embodiment, and are examples of the "first portion" and the "second portion" in the present embodiment, respectively. is there. The first cam portion 330 and the second cam portion 550 of the second embodiment are another example of the "cam mechanism" in this embodiment, and each of the "first portion" and "second portion" in this embodiment. This is an example.

[Aspect 10]
The motion conversion mechanism includes a first cam portion provided on the housing or the spindle and having a first contact surface, and a second cam portion provided on the push-down member and having a second contact surface. ,
At least one of the first contact surface and the second contact surface includes an inclined surface inclined in the circumferential direction around the drive shaft.
The first cam portion and the second cam portion are arranged so as to be relatively rotatable around the drive shaft, and the sliding of the first contact surface and the second contact surface causes the spindle with respect to the spindle. It is configured to convert the rotation of the pressing member into the linear movement of the pressing member in the vertical direction.
The first cam portion 33 and the second cam portion 55 of the above embodiment are examples of the "first cam portion" and the "second cam portion" in this embodiment, respectively. The lower surface of the first cam portion 33 and the upper surface of the second cam portion 55 are examples of the "first contact surface" and the "second contact surface" in this embodiment, respectively.

[Aspect 11]
The motion conversion mechanism includes a first cam portion provided on the housing or the spindle and having a first contact surface, and a second cam portion provided on the push-down member and having a second contact surface. ,
The first contact surface includes a first inclined surface that is inclined in the circumferential direction around the drive shaft, and a first orthogonal surface that is orthogonal to the drive shaft.
The second contact surface includes a second inclined surface that is inclined in the circumferential direction and is aligned with the first inclined surface, and a second orthogonal surface that is orthogonal to the drive axis.
The first cam portion and the second cam portion are
It is arranged so as to be relatively rotatable around the drive shaft.
As the operating member is rotated in the first direction within a predetermined angle range from the reference position, the pushing member is rotated by sliding the first inclined surface and the second inclined surface. Is converted into the linear movement, and
When the operating member is rotated in the first direction beyond the angle range, the rotation of the pushing member is linearly moved by sliding between the first orthogonal plane and the second orthogonal plane. It is configured to allow rotation of the pressing member without converting to.
The first cam portion 33 and the second cam portion 55 of the above embodiment are examples of the "first cam portion" and the "second cam portion" in this embodiment, respectively. The lower surface of the first cam portion 33 and the upper surface of the second cam portion 55 are examples of the "first contact surface" and the "second contact surface" in this embodiment, respectively.
The cam surface 333 and the orthogonal surface 332 are examples of the "first inclined surface" and the "first orthogonal surface" in this embodiment, respectively. The cam surface 553 and the orthogonal surface 552 are examples of the "second inclined surface" and the "second orthogonal surface" in this embodiment, respectively.

[Aspect 12]
The lock mechanism is
An engaging member that is configured to be engageable with the clamp shaft and is radially movable between a first position that engages the clamp shaft and a second position that cannot engage the clamp shaft.
A third position that is integrally rotatable with the spindle and holds the engaging member immovably in the first position, and the engaging member can be moved from the first position to the second position. A holding member that can move relative to the engaging member with respect to the holding fourth position is provided.
The ball 61 and the lock sleeve 63 of the above embodiment are examples of the "engagement member" and the "holding member" in this embodiment, respectively.

[Aspect 13]
The holding member is configured to be relatively moved from the third position to the fourth position when the operating member is rotated in the first direction.
[Aspect 14]
The engaging member and the holding member are configured to move relative to each other in the circumferential direction around the drive shaft.

[Aspect 15]
The engaging member and the holding member are configured to move relative to each other in the circumferential direction around the drive shaft as the pushing member rotates.

[Aspect 16]
The locking mechanism includes a second urging member that urges the engaging member or the holding member.
When the holding member is arranged at the fourth position, the engaging member is urged toward the first position by the urging force of the second urging member and engages with the clamp shaft. When the clamp shaft is moved in the direction of being removed from the spindle, the clamp shaft is moved to the second position against the urging force and is configured to disengage.
The ball urging spring 67 of the above embodiment is an example of the "second urging member" in this embodiment.

[Aspect 17]
The releasing member is configured to release the clamping force by moving downward against the urging force.
[Aspect 18]
The release member is configured to move in the vertical direction integrally with the push-down member.

[Aspect 19]
The spindle has a first inclined surface inclined in a direction intersecting the drive shaft at the lower end portion.
The clamp shaft is of the head portion and the spindle in a state where the second inclined surface provided on the tip tool is pressed against the first inclined surface from the lower side by the clamping force applied by the urging member. It is configured to clamp the tip tool between the lower ends.

1A, 1B: Vibration tool, 10: Housing, 101: Outer housing, 103: Inner housing, 11: Front end, 13: Rear end, 131: Battery mounting part, 15: Grip part, 20: Controller, 21: Motor , 211: Output shaft, 27: Slider, 28: Shift dial, 29: Switch, 3A, 3B: Spindle, 301: Bearing, 302: Bearing, 31: Cylindrical part, 32: Flange part, 33, 330: 1st cam Part, 331: Convex part, 332: Orthogonal surface, 333: Cam surface, 335: Cam groove, 35: Tool mounting part, 351: Concave part, 353: Inclined surface, 37: Spring receiving part, 371: Concave part, 39: Seal Member, 4: Transmission mechanism, 41: Eccentric shaft, 43: Swing arm, 45: Bearing, 5A, 5B: Clamp mechanism, 51, 510: Clamp shaft, 511: Shaft part, 512: Engagement groove, 513: Elasticity Member, 515: Head part, 53, 530: Intermediate shaft, 54, 540: Lower part, 541: Lock part, 542: Ball holding hole, 545: Sliding part, 546: Elastic member, 55, 550: Second Cam part, 551: Convex part, 552: Orthogonal surface, 353: Cam surface, 555: Ball, 56: Flange part, 57: Upper part, 571: Male thread part, 572: Nut, 573: Fitting hole, 574: Pins, 576, 58: Rotation transmission member, 757: Recessed part, 579: Spring receiving part, 59: Clamp spring, 6A, 6B: Lock mechanism, 61: Ball, 63: Lock sleeve, 631: Sliding part, 633: Ball holding part, 634: Shoulder part, 635: Ball receiving part, 638: Locking protrusion, 67: Ball urging spring, 69: Washer, 81: Rotating lever, 811: Fixed part, 813: Lever, 815: Protrusion , 91: Tip tool, 911: Convex part, 912: Through hole, 913: Inclined surface, 93: Battery, A1: Drive shaft, A2: Rotating shaft

Claims (15)

It is a work tool that swings and drives the tip tool to perform machining work on the work material.
With the housing
A tubular spindle rotatably supported by the housing around a drive shaft that defines the vertical direction of the work tool,
A clamp shaft that has a shaft portion that extends coaxially with the spindle in the spindle and a head portion that connects to the lower end of the shaft portion and is movable in the vertical direction with respect to the spindle.
An urging member configured to urge the clamp shaft upward with respect to the spindle and to apply a clamping force for clamping the tip tool between the head portion and the lower end portion of the spindle.
An operating member configured to rotate around the drive shaft by an external operation of the user,
A motion conversion mechanism configured to convert rotational motion around the drive axis into linear motion along the drive axis, and
A push-down member arranged so as to be movable at least in the vertical direction with respect to the spindle.
The motion conversion mechanism is configured to move the pushing member in the vertical direction in conjunction with the rotation of the operating member around the drive shaft.
The push-down member is a work tool characterized in that when the operating member is rotated in the first direction, it is moved downward and pushes down the tip tool downward. The work tool according to claim 1.
Further provided with a release member configured to release the clamping force against the urging force of the urging member in conjunction with the rotation of the operating member in the first direction.
A work tool characterized in that the push-down member is configured to push down the tip tool downward in a state where the clamping force is released by the release member. The work tool according to claim 1 or 2.
The clamp shaft is removable from the spindle and
The work tool is further provided with a locking mechanism provided in the housing and configured to lock the clamp shaft irremovably from the spindle. The work tool according to claim 3.
Further provided with a release member configured to release the clamping force against the urging force of the urging member in conjunction with the rotation of the operating member in the first direction.
In conjunction with the rotation in the first direction, the clamping force is released by the releasing member, the tip tool is pushed down by the pushing member, and the clamp shaft is unlocked by the locking mechanism in order. A work tool characterized by that. The work tool according to claim 4.
The release member is configured to release the clamping force in conjunction with the operation member being rotated in the first direction within a predetermined angle range from the reference position.
The motion conversion mechanism is configured to move the pushing member downward in conjunction with the operating member being rotated in the first direction within the angle range from the reference position.
The lock mechanism is configured to release the lock of the clamp shaft in conjunction with the operation member being rotated in the first direction beyond the angle range. tool. The work tool according to any one of claims 3 to 5.
The work tool is characterized in that the locking mechanism is configured to temporarily hold the clamp shaft in a state where the clamp shaft is unlocked. The work tool according to any one of claims 3 to 6.
The pushing member is supported by the housing via the spindle.
A work tool characterized in that the locking mechanism is configured to lock the clamp shaft by fixing the clamp shaft to the pushing member. The work tool according to any one of claims 1 to 7.
The push-down member includes a tubular portion arranged coaxially with the spindle and between the spindle and the shaft portion in the radial direction of the spindle.
The work tool is characterized by further including a first seal member arranged between the tubular portion and the spindle. The work tool according to claim 8.
Further, a second seal member arranged between the tubular portion and the spindle above the first seal member is provided.
The motion conversion mechanism is a cam mechanism including a first portion provided on the spindle and a second portion provided on the tubular portion, and in the vertical direction, the first seal member and the first seal member. A work tool characterized in that it is arranged between two seal members. The work tool according to any one of claims 1 to 9.
The motion conversion mechanism has a first cam portion having an inclined groove inclined in the circumferential direction around the drive shaft, and a curved surface matching a part of the inclined groove, and is configured to be slidable in the inclined groove. A work tool characterized by a cam mechanism including a second cam portion having an engaged portion. The work tool according to any one of claims 1 to 10.
The operating member is configured to rotate the pushing member around the drive shaft with respect to the spindle as it rotates.
The motion conversion mechanism is a cam mechanism that utilizes an inclined surface or an inclined groove that is inclined in the circumferential direction around the drive shaft, and the rotation of the pressing member is linearly moved in the vertical direction of the pressing member. It is configured to convert to
A work tool characterized in that the inclined surface or the inclined groove is configured to be inclined downward to a predetermined boundary toward the first direction and to be inclined upward when the boundary is crossed. The work tool according to any one of claims 1 to 11.
The push-down member is inserted through the spindle and is configured to reciprocate around the drive shaft together with the spindle when the tip tool is driven to swing.
The work tool is characterized by further including a bearing member arranged between the housing and the push-down member in the radial direction with respect to the drive shaft. The work tool according to any one of claims 1 to 12.
The operating member is configured to rotate the pushing member around the drive shaft with respect to the spindle as it rotates.
The urging member extends in the vertical direction, and urges the spindle and the pressing member in a direction away from each other in the vertical direction.
The work tool is characterized by further comprising a friction reducing member arranged between the upper end or the lower end of the urging member and the spindle or the pressing member. It is a work tool that swings and drives the tip tool to perform machining work on the work material.
With the housing
A tubular spindle rotatably supported by the housing around a drive shaft that defines the vertical direction of the work tool,
A clamp shaft that has a shaft portion that extends coaxially with the spindle in the spindle and a head portion that connects to the lower end of the shaft portion and is movable in the vertical direction with respect to the spindle.
An urging member configured to urge the clamp shaft upward with respect to the spindle and to apply a clamping force for clamping the tip tool between the head portion and the lower end portion of the spindle.
A locking mechanism provided in the housing and configured to lock the clamp shaft irremovably from the spindle.
A release member configured to release the clamping force against the urging force of the urging member, and a release member.
It is provided with an operating member configured to rotate around the drive shaft by an external operation of the user.
The locking mechanism is configured to unlock the clamp shaft in conjunction with the rotation of the operating member in the first direction.
A work tool characterized in that the release member is configured to release the clamping force in conjunction with the rotation of the operation member in the first direction. The work tool according to claim 14.
The release member is configured to release the clamping force in conjunction with the operation member being rotated in the first direction within a predetermined angle range from the reference position.
The lock mechanism is configured to release the lock of the clamp shaft in conjunction with the operation member being rotated in the first direction beyond the angle range. tool.

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