WO2023149054A1 - Tool attachment unit - Google Patents

Tool attachment unit Download PDF

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Publication number
WO2023149054A1
WO2023149054A1 PCT/JP2022/042991 JP2022042991W WO2023149054A1 WO 2023149054 A1 WO2023149054 A1 WO 2023149054A1 JP 2022042991 W JP2022042991 W JP 2022042991W WO 2023149054 A1 WO2023149054 A1 WO 2023149054A1
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WO
WIPO (PCT)
Prior art keywords
ball
guide groove
connecting shaft
tool
shaft portion
Prior art date
Application number
PCT/JP2022/042991
Other languages
French (fr)
Japanese (ja)
Inventor
俊明 肥高
Original Assignee
日東工器株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東工器株式会社 filed Critical 日東工器株式会社
Publication of WO2023149054A1 publication Critical patent/WO2023149054A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/107—Retention by laterally-acting detents, e.g. pins, screws, wedges; Retention by loose elements, e.g. balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general

Definitions

  • the present invention relates to a tool mounting unit including a tool adapter and a unit body to which the tool adapter is detachably connected.
  • Patent Document 1 In order to solve such problems, devices have been developed that eliminate the need for precise alignment in the circumferential direction.
  • a tool adapter instrument retainer
  • the end surface of the connecting shaft portion is formed into a star shape.
  • the tool adapter will rotate properly so that the grooves are aligned with the balls, but not when the balls are exactly in the middle of adjacent grooves.
  • the ball hits the end surface of the tool adapter and the tool adapter does not rotate in either direction, and there is a possibility that the tool adapter cannot be attached.
  • the star-shaped end face of the tool adapter has a very thin shape between the grooves, so there is a risk of denting or bending if the ball repeatedly hits that part. . Then, there is a possibility that the tool adapter cannot be attached properly.
  • an object of the present invention is to provide a tool mounting unit that can solve at least one of the above-described problems of the prior art.
  • a tool mounting unit comprising a tool adapter and a unit body to which the tool adapter is detachably connected
  • the tool adapter is a connecting shaft; a guide groove formed on the outer peripheral surface of the connecting shaft portion and having an inclined portion extending obliquely along the outer peripheral surface with respect to the longitudinal axis of the connecting shaft portion; a connecting recess formed on the outer peripheral surface of the connecting shaft; with
  • the unit body is a tubular wall portion defining an insertion hole extending rearwardly from a front end opening adapted to receive said connecting shaft portion and having a first ball retaining hole and a second ball retaining hole extending radially therethrough; In the first ball holding hole, an engaging position protruding radially inward from the inner peripheral surface of the cylindrical wall portion and engaging with the guide groove, and a position radially outward from the engaging position.
  • a first ball arranged to be displaceable between a release position that does not engage with the guide groove; In the second ball holding hole, an engagement position where the coupling recess protrudes radially inward from the inner peripheral surface of the cylindrical wall portion and engages with the connecting recess, and a position radially outside the engagement position.
  • a second ball arranged to be displaceable between a release position that does not engage with the connecting recess; Displaceable between a disconnection position and a connection position on the outside of the tubular wall, the first ball and the second ball being displaced to the release position at the disconnection position, At an intermediate position between the disconnection position and the connection position, the first ball is held at the engagement position and the second ball is allowed to be displaced to the release position.
  • a sleeve adapted to hold one ball and said second ball in said engaged position; with With the sleeve at the disconnecting position, the connecting shaft portion of the tool adapter is inserted into the insertion hole of the unit body, and the inclined portion of the guide groove is aligned with the first ball. When the first ball is pushed by the sleeve to reach the engagement position, the first ball is engaged with the guide groove at the inclined portion, and the sleeve is displaced to the intermediate position to move the connecting shaft portion to the guide position.
  • the connecting recess is positioned to align with the second ball, and the second ball is pushed by the sleeve to reach the engaging position and the connecting position.
  • a tool mounting unit is provided in which the sleeve is displaced to the coupling position while engaging with the recess.
  • a guide groove having an inclined portion is formed in the connecting shaft portion of the tool adapter, and when the first ball of the unit main body is engaged with the guide groove, the connecting concave portion of the connecting shaft portion moves toward the unit.
  • a connecting shaft is guided to align with the second ball of the body. Therefore, it is not necessary to precisely match the position of the tool adapter with respect to the unit main body in the circumferential direction, and the tool adapter can be easily connected to the unit main body.
  • the connecting operation is performed in a state in which the first ball and the second ball are permitted to be displaced to the released position or in a state in which the first ball and the second ball are in the released position, the first ball and the second ball are not attached to the connecting shaft portion. There is no risk of damage to the connecting shaft due to collision.
  • a plurality of the guide grooves are arranged at equal intervals in the circumferential direction, and the circumferential range in which each guide groove is formed on the outer peripheral surface of the connecting shaft portion is the same as that of another adjacent guide groove. It can be partially overlapped with the formed circumferential extent.
  • the first ball comes to engage with any of the guide grooves no matter where the tool adapter is inserted into the unit main body in the circumferential direction. Therefore, it is possible to perform appropriate connection without adjusting the positions of the tool adapters in the circumferential direction.
  • the inclined portion of the guide groove may be formed spirally over at least one round on the outer peripheral surface of the connecting shaft portion.
  • the first ball comes to engage with any position of the guide groove even if the tool adapter is inserted into the unit main body at any position in the circumferential direction. Therefore, it is possible to perform appropriate connection without adjusting the positions of the tool adapters in the circumferential direction.
  • the guide groove has a parallel portion extending forward from the front end of the inclined portion in parallel with the longitudinal axis, and when the second ball engages with the connecting recess, the first ball moves in the parallel direction. It is possible to engage with the guide groove at a portion.
  • first ball is engaged with the guide groove to fix the tool adapter to the unit body in the circumferential direction of the tool adapter
  • the second ball is engaged with the connecting recess to fix the tool adapter to the unit body.
  • the tool adapter can be fixed to the unit body in the direction of the longitudinal axis.
  • first ball and the second ball can be positioned at mutually shifted positions in the circumferential direction and the longitudinal axis direction of the tubular wall portion.
  • the unit main body further includes a pressing member arranged displaceably in the direction of the longitudinal axis of the tubular wall portion within the insertion hole, and a biasing member that biases the pressing member forward, The pressing member may press the connecting shaft portion forward when the connecting shaft portion is inserted into the insertion hole.
  • the pressing member further has a front end portion and a protrusion provided at the front end portion and protruding forward at a radially center position of the front end portion, and the connecting shaft portion is inserted into the insertion hole.
  • the protrusion may be in contact with the end surface of the connecting shaft portion at the center position in the radial direction.
  • the connecting shaft portion and the pressing member come into contact only at their radial center position, and when the connecting shaft portion rotates during the connecting operation, the pressing member receives almost no force in the rotational direction. It will not be transmitted. Therefore, it is possible to prevent the pressing member from rotating with the rotation of the connecting member.
  • the unit body further comprises a biasing member that biases the sleeve in a direction from the disconnection position toward the connection position;
  • the pressing member supports the first and second balls from the radially inner side and holds them at the release position in a state in which the connecting shaft portion is not inserted into the insertion hole, The sleeve is held at the disconnecting position by being pressed in a direction toward the connecting position against the first ball held at the releasing position by the pressing member, and the first ball moves to the engaging position.
  • the outer peripheral surface of the connecting shaft portion presses the second ball held at the released position in a direction toward the connecting position so that the second ball is held at the intermediate position.
  • FIG. 5 is a diagram showing a state in which the tool mounting unit according to one embodiment of the present invention is mounted on a machine tool, and is a cross-sectional view taken along line BB in FIG. 4;
  • FIG. 5 is a diagram of a tool mounting unit according to one embodiment of the present invention, and is a cross-sectional view taken along line CC of FIG. 4; It is an external appearance side view of a tool adapter.
  • FIG. 4 is a developed view of the outer peripheral surface of the connecting shaft portion of the tool adapter;
  • FIG. 2 is a cross-sectional view taken along line AA of FIG. 1;
  • FIG. 5 is a cross-sectional view taken along line BB of FIG.
  • FIG. 5 is a cross-sectional view taken along line CC of FIG. 4 in a state in which the tool adapter is halfway inserted into the unit main body;
  • FIG. 5 is a cross-sectional view taken along line BB of FIG. 4 in a state where the tool adapter is connected to the unit body;
  • FIG. 5 is a sectional view taken along line CC of FIG. 4 in a state where the tool adapter is connected to the unit body;
  • a tool mounting unit 1 according to one embodiment of the present invention, as shown in FIG. 1A, comprises a tool adapter 10 and a unit body 12 to which the tool adapter 10 is detachably connected.
  • a tool such as a drill or a grinding wheel is attached to the tool adapter 10 .
  • the unit main body 12 is attached to a unit attachment portion 14 of a machine tool so as to be rotationally driven by the machine tool.
  • the tool adapter 10 consists of an adapter body 16 and a cap 18 screwed onto the tip of the adapter body 16, as shown in FIGS.
  • the adapter main body 16 has a connecting shaft portion 20 inserted into the unit main body 12, a tool fixing portion 22 for fixing a tool, and a flange 24 provided therebetween.
  • the tool fixing portion 22 constitutes a collet chuck in which a plurality of slots are formed. The tool is fixed to the tool fixing portion 22 by tightening the cap 18 to the tool fixing portion 22 while inserting an arbitrary tool into the tool mounting hole 26 of the tool fixing portion 22 .
  • a guide groove 28 and a connecting concave portion 30 are formed on the outer peripheral surface 20a of the connecting shaft portion 20 of the adapter body 16, as shown in FIGS.
  • Three guide grooves 28 and three connecting recesses 30 are provided at equal intervals in the circumferential direction.
  • Each guide groove 28 has an inclined portion 32 extending obliquely with respect to the longitudinal axis L, and a parallel portion 34 extending parallel to the longitudinal axis L forward (upward in the drawing) from the front end of the inclined portion 32 .
  • the first guide groove 28-1 is formed in a circumferential range W1 from a position P1 to a position P2 on the outer peripheral surface 20a of the connecting shaft portion 20. As shown in FIG.
  • the second guide groove 28-2 is formed in a circumferential range W2 from a position P3 to a position P4 on the outer peripheral surface 20a of the connecting shaft portion 20.
  • a third guide groove 28-3 is formed in a circumferential range W3 from a position P5 to a position P6 on the outer peripheral surface 20a of the connecting shaft portion 20.
  • the circumferential range W1 of the guide groove 28-1 partially overlaps the circumferential range W2 of the adjacent guide groove 28-2 and the circumferential range W3 of the adjacent guide groove 28-3. ing.
  • each guide groove 28 (28-1, 28-2, 28-3) is the same as that of another adjacent guide groove 28 (28-1, 28-2, 28 -3) in the circumferential direction W (W1, W2, W3).
  • the unit body 12 as shown in FIG. 1A, has a tubular wall portion 40 extending rearwardly (downwardly as viewed in the drawing) from the front end opening 36 and defining an insertion hole 38 adapted to receive the connecting shaft portion 20; A sleeve 42 arranged on the outer peripheral surface 40 a of the tubular wall portion 40 and a pressing member 44 arranged in the insertion hole 38 are provided.
  • the cylindrical wall portion 40 is rotatably attached to the unit attachment portion 14 of the machine tool via two ball bearings 46 .
  • a bevel gear 48 is press-fitted onto the outer peripheral surface 40a of the cylindrical wall portion 40, and the bevel gear 48 meshes with a bevel gear 50 connected to the motor of the machine tool.
  • the unit main body 12 is drivingly connected to the motor of the machine tool through these bevel gears 48 and 50, and when the motor of the machine tool is driven, the unit main body 12 rotates.
  • the cylindrical wall portion 40 has a first ball holding hole 52 (FIGS. 1A, 4) and a second ball holding hole 54 (FIG. 1B) extending radially therethrough. ) are formed, and a first ball 56 and a second ball 58 are held in the first ball holding hole 52 and the second ball holding hole 54, respectively.
  • the first ball holding hole 52 and the second ball holding hole 54, and the first balls 56 and the second balls 58 held by them are arranged in three at equal intervals in the circumferential direction.
  • the second ball 58 is offset from the first ball 56 in the circumferential direction and the longitudinal axis L direction of the tubular wall portion 40 .
  • the pressing member 44 arranged in the insertion hole 38 of the tubular wall portion 40 is pressed forward by a spring (biasing member) 60 . 1A and 1B, the pressing member 44 is positioned radially inside the first ball 56 and the second ball 58, and supports the first ball 56 and the second ball 58 from the radial inside. holding it in the released position.
  • a contact ball 64 is fitted to the front end portion 62 of the pressing member 44, and the contact ball 64 forms a protrusion 64a projecting forward.
  • the sleeve 42 arranged on the outside of the cylindrical wall portion 40 is urged forward by a spring (biasing member) 66, and the engagement stepped portion 68 formed on the inner peripheral surface 42a of the sleeve 42 is in the release position.
  • the sleeve 42 is held in this uncoupled position by pressing the engagement stepped portion 68 against the first ball 56 by the biasing force of the spring 66 .
  • the sleeve 42 moves from the uncoupled position of FIGS. 1A and 1B, through the intermediate positions of FIGS. , and can be displaced in the direction of the longitudinal axis L to the connecting position of FIG. 6B.
  • the connecting shaft portion 20 of the tool adapter 10 As the connecting shaft portion 20 of the tool adapter 10 is inserted into the insertion hole 38 of the unit main body 12, the rear end surface 20b of the connecting shaft portion 20 is positioned at the radial center position of the contact ball 64 of the pressing member 44. It abuts on the protrusion 64a.
  • the connecting shaft portion 20 is further inserted into the insertion hole 38 while pushing the pressing member 44 against the urging force of the spring 60 , the first ball 56 comes into contact with any portion of the inclined portion 32 of the guide groove 28 . consistent position.
  • the first ball 56 which is pressed radially inward by the engaging stepped portion 68 of the sleeve 42, protrudes radially inward from the inner peripheral surface 40b of the cylindrical wall portion 40, as shown in FIG. 5A. Then, it is displaced radially inward into the guide groove 28 and becomes an engagement position where it engages with the guide groove 28 .
  • the engaging stepped portion 68 of the sleeve 42 is no longer engaged with the first ball 56 , and the sleeve 42 is displaced forward by the biasing force of the spring 66 . As shown in FIG.
  • the second ball 58 is supported from the radially inner side by the outer peripheral surface 20a of the connecting shaft portion 20 and held at the release position. Therefore, the sleeve 42 is displaced to an intermediate position where the engaging stepped portion 68 engages the second ball 58 .
  • the sleeve 42 is held in this intermediate position by the biasing force of the spring 66 pressing the engaging shoulder 68 against the second ball.
  • the sleeve 42 When the sleeve 42 is in this intermediate position, it supports the first ball 56 from the outside in the radial direction and retains it in the engaged position as shown in FIG. 5A.
  • the connecting shaft portion 20 When the connecting shaft portion 20 is further inserted into the insertion hole 38 , the connecting shaft portion 20 is guided by the guide groove 28 and rotated in the direction of the guide groove 28 because the first ball 56 is engaged with the guide groove 28 . It advances through the insertion hole 38 while doing so.
  • the connecting shaft portion 20 When the connecting shaft portion 20 is inserted to the mounting position where the flange 24 of the tool adapter 10 abuts against the front end surface 40c of the cylindrical wall portion 40, the first ball 56 passes through the front end of the inclined portion 32 of the guide groove 28 and is guided. A parallel portion 34 of the groove 28 is reached. At this time, the second ball 58 is aligned with the connecting recess 30 .
  • the second ball 58 which is pressed radially inward by the engaging stepped portion 68 of the sleeve 42, protrudes from the inner peripheral surface 40b of the cylindrical wall portion 40, as shown in FIG. 6B. It is displaced radially inward and becomes an engaging position where it engages with the connecting recess 30 .
  • the engaging stepped portion 68 of the sleeve 42 is no longer engaged with the second ball 58 , and the engaging stepped portion 68 of the sleeve 42 is moved by the biasing force of the spring 66 to the stop ring. It is displaced to the coupling position where it engages 70 .
  • the sleeve 42 supports the first ball 56 and the second ball 58 from the outside in the radial direction and retains them in the engaged position as shown in FIGS. 6A and 6B.
  • the engagement of the first ball 56 with the guide groove 28 at the parallel portion 34 fixes the tool adapter 10 to the unit body 12 in the circumferential direction.
  • the tool adapter 10 is fixed to the unit main body 12 in the direction of the longitudinal axis L by engaging the second ball 58 with the connecting recess 30 .
  • the tool adapter 10 is thus connected to the unit body 12 .
  • the sleeve 42 When removing the tool adapter 10 from the unit main body 12, the sleeve 42 is positioned radially outside the engaging position of the first ball 56 and the second ball 58, and is released so that it does not engage with the guide groove 28 and the connecting recess 30.
  • the tool adapter 10 is pulled out from the insertion hole 38 in a state of being displaced to the disconnection position that allows displacement to the position.
  • the tool adapter 10 When inserting the connecting shaft portion 20 of the tool adapter 10 into the insertion hole 38 , after the first ball 56 is engaged with the guide groove 28 , the tool adapter 10 advances while rotating with respect to the unit main body 12 . go. Therefore, the tool adapter 10 rotates relative to the pressing member 44 . However, since the rear end surface 20b of the connecting shaft portion 20 and the projection 64a of the pressing member 44 are in contact with each other at the center position in the radial direction, almost no rotational force from the tool adapter 10 is transmitted to the pressing member 44. Therefore, even if the tool adapter 10 rotates, the pressing member 44 does not substantially rotate.
  • FIG. 3 shows the first ball 56 moving with respect to the guide groove 28, the guide groove 28 actually moves with respect to the first ball 56 at the fixed position.
  • the first ball 56 is supported from the inside in the radial direction by the outer peripheral surface 44a of the pressing member 44 or the outer peripheral surface 20a of the connecting shaft portion 20 and held at the release position. (Fig. 1A).
  • the connecting shaft portion 20 When the connecting shaft portion 20 is further inserted, the connecting shaft portion 20 rotates along the inclined portion 32 of the guide groove 28 due to the engagement of the first ball 56 with the inclined portion 32 of the guide groove 28. move on.
  • the first ball 56 reaches the front end position B4 of the inclined portion 32 of the guide groove 28, the rotation of the connecting shaft portion 20 stops.
  • the second ball 58 is aligned with the connecting recess 30 .
  • the engagement between the first ball 56 and the guide groove 28 causes the second ball 58 to engage with the connecting concave portion 30 , thereby moving the connecting shaft.
  • a section 20 is introduced. Further, as described above, the circumferential ranges W (W1, W2, W3) of the guide grooves 28 (28-1, 28-2, 28-3) on the outer peripheral surface 20a of the connecting shaft portion 20 are adjacent to each other.
  • the first ball 56 and the guide groove 28 (28 -1, 28-2, and 28-3) in the circumferential direction the first ball 56 remains in one of the guide grooves 28 (28 -1, 28-2, 28-3). That is, no matter where the tool adapter 10 is inserted into the unit main body 12 in the circumferential direction, the first ball 56 is engaged with the guide groove 28 and the second ball 58 is thereby engaged with the connecting recess 30. Therefore, it is possible to perform appropriate connection without adjusting the position of the tool adapter 10 in the circumferential direction.
  • the second ball positioned forward of the first ball 56 may pass over the guide groove 28 before the first ball 56 engages with the guide groove 28, but at that time the sleeve 42 is disconnected. Since the position is held and the second ball 58 is allowed to be displaced to the release position, even if the second ball 58 is temporarily engaged with the guide groove 28, the guide groove 28 immediately releases the second ball 58. will be pushed radially outwardly to return to the release position. Further, after the first ball 56 is engaged with the guide groove 28 , the second ball 58 moves on the outer peripheral surface 20 a of the connecting shaft portion 20 and reaches the connecting concave portion 30 .
  • the guide groove 28 having the inclined portion 32 is formed in the connecting shaft portion 20 of the tool adapter 10, and the first ball 56 that engages with the guide groove 28 is provided in the unit main body 12.
  • the connecting shaft portion 20 is guided so that the connecting concave portion 30 of the connecting shaft portion 20 engages with the second ball 58 of the unit main body 12 . It's becoming Therefore, it is not necessary to precisely match the position of the tool adapter 10 with respect to the unit body 12 in the circumferential direction.
  • the tool adapter 10 is positioned relative to the unit main body 12. is inserted at any position in the circumferential direction, the first ball 56 will be engaged with any one of the guide grooves 28 (28-1, 28-2, 28-3). Appropriate connection can be made without directional alignment.
  • only one guide groove 28 may be provided.
  • the inclined portion 32 of the guide groove 28 can be formed spirally over at least one round on the outer peripheral surface 20a of the connecting shaft portion 20 . Since the inclined portion 32 is formed over one or more turns, the first balls 56 can be positioned at any position in the guide groove 28 regardless of the position of the tool adapter 10 inserted into the unit body 12 in the circumferential direction. It is possible to perform proper connection without adjusting the position of the tool adapter 10 in the circumferential direction.
  • the present invention is not limited to these embodiments.
  • three guide grooves 28 are formed, but the number of guide grooves can be changed arbitrarily, for example, two or four or more.
  • the sleeve is adapted to be displaced along the longitudinal axis of the tubular member, it may be displaced circumferentially between the coupled and uncoupled positions.
  • the connecting recess may be a single annular recess extending in the circumferential direction.
  • the protrusion of the pressing member may be formed integrally with the front end of the pressing member.
  • Tool mounting unit 10 Tool adapter 12 Unit main body 14 Unit mounting portion 16 Adapter main body 18 Cap 20 Connecting shaft portion 20a Outer peripheral surface 20b Rear end surface 22 Tool fixing portion 24 Flange 26 Tool mounting hole 28 (28-1, 28-2, 28 -3) Guide groove 30 Connecting recess 32 Inclined portion 34 Parallel portion 36 Front end opening 38 Insertion hole 40 Cylindrical wall portion 40a Outer peripheral surface 40b Inner peripheral surface 40c Front end surface 42 Sleeve 42a Inner peripheral surface 44 Pressing member 44a Outer peripheral surface 46 Ball bearing 48 bevel gear 50 bevel gear 52 first ball retaining hole 54 second ball retaining hole 56 first ball 58 second ball 60 spring (biasing member) 62 front end 64 contact ball 64a projection 66 spring (biasing member) 68 Engagement stepped portion 70 Stop ring B1, B2, B3, B4, B5 Position L Longitudinal axis P1, P2, P3, P4, P5, P6 Position W (W1, W2, W3) Circumferential direction range

Abstract

[Problem] To make it possible for a connection operation to be performed easily in a tool attachment unit in which there is no need to precisely match the circumferential-direction position of a tool adapter with respect to a unit body. [Solution] A tool attachment unit 1 comprises a tool adapter 10 and a unit body 12 to which the tool adapter 10 is detachably connected. The tool adapter 10 comprises a connecting shaft part 20, and a guide groove 28 and connecting recess 30 formed on an outer peripheral surface 20a of the connecting shaft part 20. The guide groove 28 has an inclined portion 32 that extends obliquely with respect to a longitudinal axis line L. When the connecting shaft part 20 is inserted in an insertion hole 38 in the unit body 12, and the inclined portion 32 of the guide groove 28 reaches a position aligned with a first ball 56, the first ball 56 displaces to an engagement position and engages in the guide groove 28. The connecting shaft part 20 is inserted to an attachment position while being guided by the guide groove 28. The connecting recess 30 reaches a position aligned with a second ball 58, and the second ball 58 reaches an engagement position and engages with the connecting recess 30.

Description

工具取付ユニットtool mounting unit
　本発明は、工具アダプタと、工具アダプタが着脱可能に連結されるユニット本体とを備える工具取付ユニットに関する。 The present invention relates to a tool mounting unit including a tool adapter and a unit body to which the tool adapter is detachably connected.
　例えば、ドリルや研削砥石のような工具を用いて加工作業を行なう工作機械において、工具は加工作業を行なうにしたがい徐々に摩耗したり破損したりするため交換する必要が生じる。または、同じ工作機械で異なる加工作業を行なうために、別の工具に交換することもある。このような工具の交換作業はロボットを使用して行われることがある。 For example, in machine tools that use tools such as drills and grinding wheels to carry out machining operations, the tools gradually wear out or break as machining operations are carried out, and therefore need to be replaced. Alternatively, different tools may be used to perform different machining operations on the same machine tool. Such tool changing operations are sometimes performed using robots.
　工具の交換はできるだけ迅速且つ容易に行えることが望ましく、多くの工具取付ユニットにおいては、工具又は工具を保持する工具アダプタの軸部に形成された凹部に、ユニット本体に設けられたボールを嵌合させて工具又は工具アダプタをユニット本体に長手方向及び回転方向で固定する方式が採用されている。しかしながら、このような固定方式では、工具アダプタの凹部とユニット本体のボールとの周方向位置を精確に合わせた状態で工具アダプタの軸部をユニット本体に挿入する必要があるため、工具の交換作業を行なうためのロボットが周方向位置の検出やその検出結果に基づく周方向での精確な位置合わせを行なわなければならない。そのため、高度なロボットシステムを導入しなければならなかった。 It is desirable to replace tools as quickly and easily as possible, and in many tool mounting units, balls provided on the unit body are fitted into recesses formed in the shaft of the tool or tool adapter that holds the tool. A method is adopted in which the tool or the tool adapter is fixed to the unit main body in the longitudinal direction and in the rotational direction. However, in such a fixing method, it is necessary to insert the shaft portion of the tool adapter into the unit body while the concave portion of the tool adapter and the ball of the unit body are precisely aligned in the circumferential direction. The robot must detect the position in the circumferential direction and perform accurate positioning in the circumferential direction based on the detection result. Therefore, an advanced robotic system had to be introduced.
　このような問題を解決するために、周方向の位置合わせを精確に行なう必要がないようにしたものが開発されている。例えば、特許文献１においては、工具アダプタ（用具保持器）の連結軸部（保持部）に６つの溝を周方向で近接するように設けて連結軸部の端面を星の形状とすることにより、工具アダプタを機械側の筒状部に挿入したときに工具アダプタの溝と筒状部に保持されたボールとの周方向での位置が多少ずれていても溝の縁がボールに当たって溝がボールと整合するように工具アダプタが回転するようになっている。このような構造を採用することにより、工具アダプタの周方向での位置を精確に合わせる必要がないようにしている。 In order to solve such problems, devices have been developed that eliminate the need for precise alignment in the circumferential direction. For example, in Patent Document 1, six grooves are provided in the connecting shaft portion (holding portion) of a tool adapter (instrument retainer) so as to be close to each other in the circumferential direction, and the end surface of the connecting shaft portion is formed into a star shape. When the tool adapter is inserted into the cylindrical part of the machine, even if the grooves of the tool adapter and the balls held in the cylindrical part are slightly misaligned in the circumferential direction, the edges of the grooves contact the balls and the grooves remain closed. The tool adapter is rotated to align with the By adopting such a structure, there is no need to precisely match the position of the tool adapter in the circumferential direction.
特許第６２８８６４６号公報Japanese Patent No. 6288646
　しかしながら、上述の従来技術においては、多くの場合には工具アダプタは溝がボールと整合するように回転して適切に取り付けられることになるが、ボールが隣り合う溝のちょうど真ん中に位置した場合には、ボールが工具アダプタの端面に当り工具アダプタがどちらの方向にも回転せず、工具アダプタが取り付けられない状況が生じる虞がある。また、工具アダプタの星の形状とされた端面は、溝と溝の間に部分が非常に細い形状となっているため、その部分にボールが繰り返し当たると凹みや曲げが生じたりする虞がある。そうすると、工具アダプタを適切に取り付けることができなくなる虞がある。 However, in the prior art discussed above, in many cases the tool adapter will rotate properly so that the grooves are aligned with the balls, but not when the balls are exactly in the middle of adjacent grooves. In this case, the ball hits the end surface of the tool adapter and the tool adapter does not rotate in either direction, and there is a possibility that the tool adapter cannot be attached. In addition, the star-shaped end face of the tool adapter has a very thin shape between the grooves, so there is a risk of denting or bending if the ball repeatedly hits that part. . Then, there is a possibility that the tool adapter cannot be attached properly.
　そこで本発明は、上述の従来技術の課題のうちの少なくとも一つを解決することが可能となる工具取付ユニットを提供することを目的とする。 Accordingly, an object of the present invention is to provide a tool mounting unit that can solve at least one of the above-described problems of the prior art.
　すなわち本発明は、
　工具アダプタと、前記工具アダプタが着脱可能に連結されるユニット本体とを備える工具取付ユニットであって、
　前記工具アダプタは、
　　連結軸部と、
　　前記連結軸部の外周面上に形成され、前記外周面に沿って前記連結軸部の長手軸線に対して斜めに延びる傾斜部分を有するガイド溝と、
　　前記連結軸部の外周面上に形成された連結凹部と、
　を備え、
　前記ユニット本体は、
　　前端開口から後方に延びて前記連結軸部を受け入れるようにされた挿入孔を画定し、径方向に貫通する第１ボール保持孔及び第２ボール保持孔を有する筒状壁部と、
　　前記第１ボール保持孔内で、前記筒状壁部の内周面から径方向内側に突出して前記ガイド溝と係合する係合位置と、前記係合位置よりも径方向外側の位置であり前記ガイド溝と係合しない解放位置との間で変位可能に配置された第１ボールと、
　　前記第２ボール保持孔内で、前記筒状壁部の内周面から径方向内側に突出して前記連結凹部と係合する係合位置と、前記係合位置よりも径方向外側の位置であり前記連結凹部と係合しない解放位置との間で変位可能に配置された第２ボールと、
　　前記筒状壁部の外側で連結解除位置と連結位置との間で変位可能に配置され、前記連結解除位置では前記第１ボール及び前記第２ボールが前記解放位置に変位することを許容し、前記連結解除位置と前記連結位置との間の中間位置では前記第１ボールを前記係合位置に保持し、前記第２ボールが前記解放位置に変位することを許容し、前記連結位置では前記第１ボール及び前記第２ボールを前記係合位置に保持するようにされたスリーブと、
　を備え、
　前記スリーブが前記連結解除位置にある状態で前記工具アダプタの前記連結軸部を前記ユニット本体の前記挿入孔内に挿入して前記ガイド溝の前記傾斜部分が前記第１ボールと整合する位置となったときに、前記第１ボールが前記スリーブに押されて前記係合位置となり前記傾斜部分において前記ガイド溝に係合するとともに前記スリーブが前記中間位置にまで変位し、前記連結軸部を前記ガイド溝によって案内されながら所定の取付位置にまでさらに挿入したときに、前記連結凹部が前記第２ボールと整合する位置となって前記第２ボールが前記スリーブに押されて前記係合位置となり前記連結凹部と係合するとともに前記スリーブが前記連結位置にまで変位するようにされた、工具取付ユニットを提供する。 That is, the present invention
A tool mounting unit comprising a tool adapter and a unit body to which the tool adapter is detachably connected,
The tool adapter is
a connecting shaft;
a guide groove formed on the outer peripheral surface of the connecting shaft portion and having an inclined portion extending obliquely along the outer peripheral surface with respect to the longitudinal axis of the connecting shaft portion;
a connecting recess formed on the outer peripheral surface of the connecting shaft;
with
The unit body is
a tubular wall portion defining an insertion hole extending rearwardly from a front end opening adapted to receive said connecting shaft portion and having a first ball retaining hole and a second ball retaining hole extending radially therethrough;
In the first ball holding hole, an engaging position protruding radially inward from the inner peripheral surface of the cylindrical wall portion and engaging with the guide groove, and a position radially outward from the engaging position. a first ball arranged to be displaceable between a release position that does not engage with the guide groove;
In the second ball holding hole, an engagement position where the coupling recess protrudes radially inward from the inner peripheral surface of the cylindrical wall portion and engages with the connecting recess, and a position radially outside the engagement position. a second ball arranged to be displaceable between a release position that does not engage with the connecting recess;
Displaceable between a disconnection position and a connection position on the outside of the tubular wall, the first ball and the second ball being displaced to the release position at the disconnection position, At an intermediate position between the disconnection position and the connection position, the first ball is held at the engagement position and the second ball is allowed to be displaced to the release position. a sleeve adapted to hold one ball and said second ball in said engaged position;
with
With the sleeve at the disconnecting position, the connecting shaft portion of the tool adapter is inserted into the insertion hole of the unit body, and the inclined portion of the guide groove is aligned with the first ball. When the first ball is pushed by the sleeve to reach the engagement position, the first ball is engaged with the guide groove at the inclined portion, and the sleeve is displaced to the intermediate position to move the connecting shaft portion to the guide position. When the sleeve is further inserted to a predetermined mounting position while being guided by the groove, the connecting recess is positioned to align with the second ball, and the second ball is pushed by the sleeve to reach the engaging position and the connecting position. A tool mounting unit is provided in which the sleeve is displaced to the coupling position while engaging with the recess.
　当該工具取付ユニットにおいては、工具アダプタの連結軸部に傾斜部分を有するガイド溝が形成されており、ユニット本体の第１ボールがガイド溝に係合することにより、連結軸部の連結凹部がユニット本体の第２ボールと整合するように連結軸部が案内されるようになっている。そのため、ユニット本体に対する工具アダプタの周方向での位置を精確に合わせる必要がなく、容易に工具アダプタをユニット本体に連結することが可能となる。また、第１ボール及び第２ボールが解放位置に変位することが許容されている状態または解放位置となっている状態で連結操作が行なわれるため、第１ボール及び第２ボールが連結軸部に衝突して連結軸部を損傷させる虞もない。 In this tool mounting unit, a guide groove having an inclined portion is formed in the connecting shaft portion of the tool adapter, and when the first ball of the unit main body is engaged with the guide groove, the connecting concave portion of the connecting shaft portion moves toward the unit. A connecting shaft is guided to align with the second ball of the body. Therefore, it is not necessary to precisely match the position of the tool adapter with respect to the unit main body in the circumferential direction, and the tool adapter can be easily connected to the unit main body. In addition, since the connecting operation is performed in a state in which the first ball and the second ball are permitted to be displaced to the released position or in a state in which the first ball and the second ball are in the released position, the first ball and the second ball are not attached to the connecting shaft portion. There is no risk of damage to the connecting shaft due to collision.
　また、前記ガイド溝が周方向で等間隔に並んで複数設けられており、該連結軸部の外周面上での各ガイド溝が形成されている周方向範囲が、隣り合う別のガイド溝が形成されている周方向範囲と部分的に重なるようにすることができる。 In addition, a plurality of the guide grooves are arranged at equal intervals in the circumferential direction, and the circumferential range in which each guide groove is formed on the outer peripheral surface of the connecting shaft portion is the same as that of another adjacent guide groove. It can be partially overlapped with the formed circumferential extent.
　このような構成とすることにより、ユニット本体に対して工具アダプタを周方向でのどの位置で挿入しても、第１ボールは何れかのガイド溝に係合するようになる。よって、工具アダプタの周方向での位置を合わせることなく適切な連結を行なうことが可能となる。 By adopting such a configuration, the first ball comes to engage with any of the guide grooves no matter where the tool adapter is inserted into the unit main body in the circumferential direction. Therefore, it is possible to perform appropriate connection without adjusting the positions of the tool adapters in the circumferential direction.
　又は、前記ガイド溝の前記傾斜部分が前記連結軸部の外周面上を螺旋状に少なくとも１周にわたって形成されているようにすることができる。 Alternatively, the inclined portion of the guide groove may be formed spirally over at least one round on the outer peripheral surface of the connecting shaft portion.
　このような構成とすることにより、ユニット本体に対して工具アダプタを周方向でのどの位置で挿入しても、第１ボールはガイド溝の何れかの位置で係合するようになる。よって、工具アダプタの周方向での位置を合わせることなく適切な連結を行なうことが可能となる。 By adopting such a configuration, the first ball comes to engage with any position of the guide groove even if the tool adapter is inserted into the unit main body at any position in the circumferential direction. Therefore, it is possible to perform appropriate connection without adjusting the positions of the tool adapters in the circumferential direction.
　また、前記ガイド溝が、前記傾斜部分の前端から前方に前記長手軸線と平行に延びる平行部分を有し、前記第２ボールが前記連結凹部と係合したときに、前記第１ボールは前記平行部分において前記ガイド溝と係合しているようにすることができる。 In addition, the guide groove has a parallel portion extending forward from the front end of the inclined portion in parallel with the longitudinal axis, and when the second ball engages with the connecting recess, the first ball moves in the parallel direction. It is possible to engage with the guide groove at a portion.
　さらに、前記第１ボールが前記ガイド溝に係合することにより前記工具アダプタが前記ユニット本体に対して前記工具アダプタの周方向で固定され、前記第２ボールが前記連結凹部に係合することにより前記工具アダプタが前記ユニット本体に対して前記長手軸線の方向で固定されるようにすることができる。 Further, the first ball is engaged with the guide groove to fix the tool adapter to the unit body in the circumferential direction of the tool adapter, and the second ball is engaged with the connecting recess to fix the tool adapter to the unit body. The tool adapter can be fixed to the unit body in the direction of the longitudinal axis.
　工具アダプタの周方向での固定と長手軸線の方向での固定を別のボールにより行なうようにすることにより、応力が分散されて連結軸部がより破損しにくくなる。 By using different balls to fix the tool adapter in the circumferential direction and in the direction of the longitudinal axis, the stress is dispersed and the connecting shaft is less likely to break.
　また、前記第１ボールと前記第２ボールが、前記筒状壁部の周方向及び長手軸線の方向で相互にずれた位置にあるようにすることができる。 In addition, the first ball and the second ball can be positioned at mutually shifted positions in the circumferential direction and the longitudinal axis direction of the tubular wall portion.
　さらに、前記ユニット本体が、前記挿入孔内で前記筒状壁部の長手軸線の方向に変位可能に配置された押圧部材と、前記押圧部材を前方に付勢する付勢部材とをさらに備え、前記連結軸部が前記挿入孔に挿入されたときに前記押圧部材が前記連結軸部を前方に押圧するようにすることができる。 Further, the unit main body further includes a pressing member arranged displaceably in the direction of the longitudinal axis of the tubular wall portion within the insertion hole, and a biasing member that biases the pressing member forward, The pressing member may press the connecting shaft portion forward when the connecting shaft portion is inserted into the insertion hole.
　この場合にはさらに、前記押圧部材は、前端部と、前記前端部に設けられ前記前端部の径方向中心位置において前方に突出した突部を有し、前記連結軸部が前記挿入孔に挿入されたときに、前記突部が前記連結軸部の端面に径方向中心位置で当接するようにすることができる。 In this case, the pressing member further has a front end portion and a protrusion provided at the front end portion and protruding forward at a radially center position of the front end portion, and the connecting shaft portion is inserted into the insertion hole. When the connecting shaft is engaged, the protrusion may be in contact with the end surface of the connecting shaft portion at the center position in the radial direction.
　このような構成により、連結軸部と押圧部材とがそれらの径方向中心位置でのみ接触するようになり、連結操作において連結軸部が回転したときに押圧部材には回転方向での力がほとんど伝わらなくなる。よって、連結部材の回転にともなって押圧部材が回転することを防止することが可能となる。 With such a configuration, the connecting shaft portion and the pressing member come into contact only at their radial center position, and when the connecting shaft portion rotates during the connecting operation, the pressing member receives almost no force in the rotational direction. It will not be transmitted. Therefore, it is possible to prevent the pressing member from rotating with the rotation of the connecting member.
　また、
　前記ユニット本体が、前記連結解除位置から前記連結位置に向かう方向に前記スリーブを付勢する付勢部材をさらに備え、
　前記押圧部材は、前記連結軸部を前記挿入孔に挿入していない状態において、前記第１及び第２ボールを径方向内側から支持して前記解放位置に保持するようにされ、
　前記スリーブは、前記押圧部材によって前記解放位置に保持された前記第１ボールに対して前記連結位置に向かう方向で押し付けられて前記連結解除位置に保持され、前記第１ボールが前記係合位置に変位したときには前記連結軸部の外周面によって前記解放位置に保持された前記第２ボールに対して前記連結位置に向かう方向で押し付けられて前記中間位置に保持されるようにすることができる。 again,
the unit body further comprises a biasing member that biases the sleeve in a direction from the disconnection position toward the connection position;
The pressing member supports the first and second balls from the radially inner side and holds them at the release position in a state in which the connecting shaft portion is not inserted into the insertion hole,
The sleeve is held at the disconnecting position by being pressed in a direction toward the connecting position against the first ball held at the releasing position by the pressing member, and the first ball moves to the engaging position. When displaced, the outer peripheral surface of the connecting shaft portion presses the second ball held at the released position in a direction toward the connecting position so that the second ball is held at the intermediate position.
　以下、本発明に係る工具取付ユニットの実施形態を添付図面に基づき説明する。 An embodiment of a tool mounting unit according to the present invention will be described below with reference to the accompanying drawings.
本発明の一実施形態に係る工具取付ユニットを工作機械に取り付けた状態の図であり、図４のＢ－Ｂ線における断面図である。FIG. 5 is a diagram showing a state in which the tool mounting unit according to one embodiment of the present invention is mounted on a machine tool, and is a cross-sectional view taken along line BB in FIG. 4; 本発明の一実施形態に係る工具取付ユニットの図であり、図４のＣ－Ｃ線における断面図である。FIG. 5 is a diagram of a tool mounting unit according to one embodiment of the present invention, and is a cross-sectional view taken along line CC of FIG. 4; 工具アダプタの外観側面図である。It is an external appearance side view of a tool adapter. 工具アダプタの連結軸部の外周面の展開図である。FIG. 4 is a developed view of the outer peripheral surface of the connecting shaft portion of the tool adapter; 図１のＡ－Ａ線における断面図である。FIG. 2 is a cross-sectional view taken along line AA of FIG. 1; ユニット本体に工具アダプタを途中まで挿入した状態における、図４のＢ－Ｂ線における断面図である。FIG. 5 is a cross-sectional view taken along line BB of FIG. 4 in a state in which the tool adapter is inserted halfway into the unit main body; ユニット本体に工具アダプタを途中まで挿入した状態における、図４のＣ－Ｃ線における断面図である。FIG. 5 is a cross-sectional view taken along line CC of FIG. 4 in a state in which the tool adapter is halfway inserted into the unit main body; ユニット本体に工具アダプタを連結した状態における、図４のＢ－Ｂ線における断面図である。FIG. 5 is a cross-sectional view taken along line BB of FIG. 4 in a state where the tool adapter is connected to the unit body; ユニット本体に工具アダプタを連結した状態における、図４のＣ－Ｃ線における断面図である。FIG. 5 is a sectional view taken along line CC of FIG. 4 in a state where the tool adapter is connected to the unit body;
　本発明の一実施形態に係る工具取付ユニット１は、図１Ａに示すように、工具アダプタ１０と、工具アダプタ１０が着脱可能に連結されるユニット本体１２とからなる。工具アダプタ１０には、ドリルや研削砥石などの工具（図示しない）が取り付けられるようになっている。また、ユニット本体１２は、工作機械のユニット取付部１４に取り付けられて工作機械によって回転駆動されるようになっている。 A tool mounting unit 1 according to one embodiment of the present invention, as shown in FIG. 1A, comprises a tool adapter 10 and a unit body 12 to which the tool adapter 10 is detachably connected. A tool (not shown) such as a drill or a grinding wheel is attached to the tool adapter 10 . Further, the unit main body 12 is attached to a unit attachment portion 14 of a machine tool so as to be rotationally driven by the machine tool.
　工具アダプタ１０は、図１Ａ、１Ｂ、及び図２に示すように、アダプタ本体１６と、アダプタ本体１６の先端部に螺合されたキャップ１８とからなる。アダプタ本体１６は、ユニット本体１２に挿入される連結軸部２０と、工具を固定するようにされた工具固定部２２と、それらの間に設けられたフランジ２４とを有する。工具固定部２２は、複数のすり割りが形成されたコレットチャックを構成している。工具固定部２２の工具取付孔２６に任意の工具を挿入した状態でキャップ１８を工具固定部２２に締め付けることにより、工具は工具固定部２２に固定される。 The tool adapter 10 consists of an adapter body 16 and a cap 18 screwed onto the tip of the adapter body 16, as shown in FIGS. The adapter main body 16 has a connecting shaft portion 20 inserted into the unit main body 12, a tool fixing portion 22 for fixing a tool, and a flange 24 provided therebetween. The tool fixing portion 22 constitutes a collet chuck in which a plurality of slots are formed. The tool is fixed to the tool fixing portion 22 by tightening the cap 18 to the tool fixing portion 22 while inserting an arbitrary tool into the tool mounting hole 26 of the tool fixing portion 22 .
　アダプタ本体１６の連結軸部２０の外周面２０ａ上には、図２及び図３に示すように、ガイド溝２８と連結凹部３０が形成されている。ガイド溝２８及び連結凹部３０は、それぞれ、周方向に等間隔に並んで３つ設けられている。各ガイド溝２８は、長手軸線Ｌに対して斜めに延びる傾斜部分３２と、傾斜部分３２の前端から前方（図で見て上方）に長手軸線Ｌと平行に延びる平行部分３４とを有する。１つ目のガイド溝２８－１は、連結軸部２０の外周面２０ａ上での位置Ｐ１から位置Ｐ２までの周方向範囲Ｗ１に形成されている。２つ目のガイド溝２８－２は、連結軸部２０の外周面２０ａ上での位置Ｐ３から位置Ｐ４までの周方向範囲Ｗ２に形成されている。３つ目のガイド溝２８－３は、連結軸部２０の外周面２０ａ上での位置Ｐ５から位置Ｐ６までの周方向範囲Ｗ３に形成されている。図３から分かるように、ガイド溝２８－１の周方向範囲Ｗ１は、隣り合うガイド溝２８－２の周方向範囲Ｗ２及びガイド溝２８－３の周方向範囲Ｗ３と部分的に重なるようになっている。すなわち、各ガイド溝２８（２８－１、２８－２、２８－３）の周方向範囲Ｗ（Ｗ１、Ｗ２、Ｗ３）は、隣り合う別のガイド溝２８（２８－１、２８－２、２８－３）の周方向範囲Ｗ（Ｗ１、Ｗ２、Ｗ３）と部分的に重なるようになっている。 A guide groove 28 and a connecting concave portion 30 are formed on the outer peripheral surface 20a of the connecting shaft portion 20 of the adapter body 16, as shown in FIGS. Three guide grooves 28 and three connecting recesses 30 are provided at equal intervals in the circumferential direction. Each guide groove 28 has an inclined portion 32 extending obliquely with respect to the longitudinal axis L, and a parallel portion 34 extending parallel to the longitudinal axis L forward (upward in the drawing) from the front end of the inclined portion 32 . The first guide groove 28-1 is formed in a circumferential range W1 from a position P1 to a position P2 on the outer peripheral surface 20a of the connecting shaft portion 20. As shown in FIG. The second guide groove 28-2 is formed in a circumferential range W2 from a position P3 to a position P4 on the outer peripheral surface 20a of the connecting shaft portion 20. As shown in FIG. A third guide groove 28-3 is formed in a circumferential range W3 from a position P5 to a position P6 on the outer peripheral surface 20a of the connecting shaft portion 20. As shown in FIG. As can be seen from FIG. 3, the circumferential range W1 of the guide groove 28-1 partially overlaps the circumferential range W2 of the adjacent guide groove 28-2 and the circumferential range W3 of the adjacent guide groove 28-3. ing. That is, the circumferential range W (W1, W2, W3) of each guide groove 28 (28-1, 28-2, 28-3) is the same as that of another adjacent guide groove 28 (28-1, 28-2, 28 -3) in the circumferential direction W (W1, W2, W3).
　ユニット本体１２は、図１Ａに示すように、前端開口３６から後方（図で見て下方）に延びて連結軸部２０を受け入れるようにされた挿入孔３８を画定する筒状壁部４０と、筒状壁部４０の外周面４０ａ上に配置されたスリーブ４２と、挿入孔３８内に配置された押圧部材４４とを備える。筒状壁部４０は、工作機械のユニット取付部１４に対して２つのボールベアリング４６を介して回転可能に取り付けられている。また筒状壁部４０の外周面４０ａ上にはベベルギヤ４８が圧入により固定されており、このベベルギヤ４８は工作機械のモータに接続されたベベルギヤ５０と噛み合っている。ユニット本体１２はこれらベベルギヤ４８、５０を介して工作機械のモータに駆動連結されており、工作機械のモータが駆動されるとユニット本体１２が回転するようになっている。 The unit body 12, as shown in FIG. 1A, has a tubular wall portion 40 extending rearwardly (downwardly as viewed in the drawing) from the front end opening 36 and defining an insertion hole 38 adapted to receive the connecting shaft portion 20; A sleeve 42 arranged on the outer peripheral surface 40 a of the tubular wall portion 40 and a pressing member 44 arranged in the insertion hole 38 are provided. The cylindrical wall portion 40 is rotatably attached to the unit attachment portion 14 of the machine tool via two ball bearings 46 . A bevel gear 48 is press-fitted onto the outer peripheral surface 40a of the cylindrical wall portion 40, and the bevel gear 48 meshes with a bevel gear 50 connected to the motor of the machine tool. The unit main body 12 is drivingly connected to the motor of the machine tool through these bevel gears 48 and 50, and when the motor of the machine tool is driven, the unit main body 12 rotates.
　図１Ａ、図１Ｂ、及び図４に示すように、筒状壁部４０には、径方向に貫通した第１ボール保持孔５２（図１Ａ、図４）及び第２ボール保持孔５４（図１Ｂ）が形成され、第１ボール保持孔５２及び第２ボール保持孔５４内にはそれぞれ第１ボール５６及び第２ボール５８が保持されている。第１ボール保持孔５２及び第２ボール保持孔５４、並びにそれらに保持された第１ボール５６及び第２ボール５８は、それぞれ周方向で等間隔に並んで３つ形成されている。第２ボール５８は、第１ボール５６に対して、筒状壁部４０の周方向及び長手軸線Ｌの方向でずれた位置にある。 As shown in FIGS. 1A, 1B, and 4, the cylindrical wall portion 40 has a first ball holding hole 52 (FIGS. 1A, 4) and a second ball holding hole 54 (FIG. 1B) extending radially therethrough. ) are formed, and a first ball 56 and a second ball 58 are held in the first ball holding hole 52 and the second ball holding hole 54, respectively. The first ball holding hole 52 and the second ball holding hole 54, and the first balls 56 and the second balls 58 held by them are arranged in three at equal intervals in the circumferential direction. The second ball 58 is offset from the first ball 56 in the circumferential direction and the longitudinal axis L direction of the tubular wall portion 40 .
　筒状壁部４０の挿入孔３８内に配置されている押圧部材４４は、スプリング（付勢部材）６０によって前方に押圧されている。図１Ａ及び図１Ｂの非連結状態では、押圧部材４４は第１ボール５６及び第２ボール５８の径方向内側に位置しており、第１ボール５６及び第２ボール５８を径方向内側から支持して解放位置に保持している。また、押圧部材４４の前端部６２には当接ボール６４が嵌合されており、この当接ボール６４によって前方に突出した突部６４ａが形成されている。筒状壁部４０の外側に配置されたスリーブ４２は、スプリング（付勢部材）６６によって前方に付勢されて、その内周面４２ａに形成された係合段部６８が解放位置にある第１ボール５６に係合した位置にある。スリーブ４２は、スプリング６６の付勢力によって係合段部６８が第１ボール５６に押し付けられることにより、この連結解除位置に保持されている。スリーブ４２は、後述するように、第１ボール５６及び第２ボール５８の位置に応じて、図１Ａ及び図１Ｂの連結解除位置から、図５Ａ及び図５Ｂの中間位置を通過して、図６Ａ及び図６Ｂの連結位置にまで長手軸線Ｌの方向で変位可能となっている。 The pressing member 44 arranged in the insertion hole 38 of the tubular wall portion 40 is pressed forward by a spring (biasing member) 60 . 1A and 1B, the pressing member 44 is positioned radially inside the first ball 56 and the second ball 58, and supports the first ball 56 and the second ball 58 from the radial inside. holding it in the released position. A contact ball 64 is fitted to the front end portion 62 of the pressing member 44, and the contact ball 64 forms a protrusion 64a projecting forward. The sleeve 42 arranged on the outside of the cylindrical wall portion 40 is urged forward by a spring (biasing member) 66, and the engagement stepped portion 68 formed on the inner peripheral surface 42a of the sleeve 42 is in the release position. 1 ball 56 is engaged. The sleeve 42 is held in this uncoupled position by pressing the engagement stepped portion 68 against the first ball 56 by the biasing force of the spring 66 . The sleeve 42 moves from the uncoupled position of FIGS. 1A and 1B, through the intermediate positions of FIGS. , and can be displaced in the direction of the longitudinal axis L to the connecting position of FIG. 6B.
　ユニット本体１２の挿入孔３８内に工具アダプタ１０の連結軸部２０を挿入していくと、連結軸部２０の後端面２０ｂが、その径方向中心位置で、押圧部材４４の当接ボール６４の突部６４ａに当接する。押圧部材４４をスプリング６０の付勢力に抗して押しながら連結軸部２０を挿入孔３８内にさらに挿入していくと、第１ボール５６がガイド溝２８の傾斜部分３２の何れかの部分と整合した位置となる。そうすると、スリーブ４２の係合段部６８によって径方向内側に押圧されている第１ボール５６は、図５Ａに示すように、筒状壁部４０の内周面４０ｂから径方向内側に突出するようにガイド溝２８内へと径方向内側に変位し、ガイド溝２８と係合した係合位置となる。そして、第１ボール５６が係合位置となることによりスリーブ４２の係合段部６８が第１ボール５６と係合しなくなり、スリーブ４２はスプリング６６の付勢力によって前方に変位する。図５Ｂに示すように、このとき第２ボール５８は、連結軸部２０の外周面２０ａによって径方向内側から支持されて解放位置に保持されている。そのため、スリーブ４２は、係合段部６８が第２ボール５８に係合する中間位置にまで変位する。スリーブ４２は、スプリング６６の付勢力によって係合段部６８が第２ボールに押し付けられることにより、この中間位置に保持される。スリーブ４２は、この中間位置にあるときには、図５Ａに示すように第１ボール５６を径方向外側から支持して係合位置に保持する。 As the connecting shaft portion 20 of the tool adapter 10 is inserted into the insertion hole 38 of the unit main body 12, the rear end surface 20b of the connecting shaft portion 20 is positioned at the radial center position of the contact ball 64 of the pressing member 44. It abuts on the protrusion 64a. When the connecting shaft portion 20 is further inserted into the insertion hole 38 while pushing the pressing member 44 against the urging force of the spring 60 , the first ball 56 comes into contact with any portion of the inclined portion 32 of the guide groove 28 . consistent position. As a result, the first ball 56, which is pressed radially inward by the engaging stepped portion 68 of the sleeve 42, protrudes radially inward from the inner peripheral surface 40b of the cylindrical wall portion 40, as shown in FIG. 5A. Then, it is displaced radially inward into the guide groove 28 and becomes an engagement position where it engages with the guide groove 28 . When the first ball 56 reaches the engaging position, the engaging stepped portion 68 of the sleeve 42 is no longer engaged with the first ball 56 , and the sleeve 42 is displaced forward by the biasing force of the spring 66 . As shown in FIG. 5B, at this time, the second ball 58 is supported from the radially inner side by the outer peripheral surface 20a of the connecting shaft portion 20 and held at the release position. Therefore, the sleeve 42 is displaced to an intermediate position where the engaging stepped portion 68 engages the second ball 58 . The sleeve 42 is held in this intermediate position by the biasing force of the spring 66 pressing the engaging shoulder 68 against the second ball. When the sleeve 42 is in this intermediate position, it supports the first ball 56 from the outside in the radial direction and retains it in the engaged position as shown in FIG. 5A.
　連結軸部２０をさらに挿入孔３８内に挿入すると、第１ボール５６がガイド溝２８に係合していることにより、連結軸部２０はガイド溝２８に案内されてガイド溝２８の方向に回転しながら挿入孔３８内を進んでいく。工具アダプタ１０のフランジ２４が筒状壁部４０の前端面４０ｃに当接する取付位置にまで連結軸部２０を挿入すると、第１ボール５６がガイド溝２８の傾斜部分３２の前端を通過してガイド溝２８の平行部分３４に至る。このとき、第２ボール５８が連結凹部３０と整合した位置となる。そうすると、スリーブ４２の係合段部６８によって径方向内側に押圧されている第２ボール５８は、図６Ｂに示すように、筒状壁部４０の内周面４０ｂから突出するように連結凹部３０内へと径方向内側に変位し、連結凹部３０と係合した係合位置となる。そして、第２ボール５８が係合位置となることによりスリーブ４２の係合段部６８が第２ボール５８と係合しなくなり、スリーブ４２はスプリング６６の付勢力によって係合段部６８がストップリング７０に係合する連結位置にまで変位する。スリーブ４２は、この連結位置にあるときには、図６Ａ及び図６Ｂに示すように第１ボール５６及び第２ボール５８を径方向外側から支持して係合位置に保持する。第１ボール５６が平行部分３４においてガイド溝２８と係合することにより、工具アダプタ１０はユニット本体１２に対して周方向で固定される。また第２ボール５８が連結凹部３０と係合することにより、工具アダプタ１０はユニット本体１２に対して長手軸線Ｌの方向で固定される。このようにして、工具アダプタ１０はユニット本体１２に連結される。工具アダプタ１０をユニット本体１２から取り外す際には、スリーブ４２を第１ボール５６及び第２ボール５８が係合位置よりも径方向外側の位置でありガイド溝２８及び連結凹部３０と係合しない解放位置に変位することを許容する連結解除位置にまで変位させた状態で、工具アダプタ１０を挿入孔３８から引き抜くようにする。 When the connecting shaft portion 20 is further inserted into the insertion hole 38 , the connecting shaft portion 20 is guided by the guide groove 28 and rotated in the direction of the guide groove 28 because the first ball 56 is engaged with the guide groove 28 . It advances through the insertion hole 38 while doing so. When the connecting shaft portion 20 is inserted to the mounting position where the flange 24 of the tool adapter 10 abuts against the front end surface 40c of the cylindrical wall portion 40, the first ball 56 passes through the front end of the inclined portion 32 of the guide groove 28 and is guided. A parallel portion 34 of the groove 28 is reached. At this time, the second ball 58 is aligned with the connecting recess 30 . Then, the second ball 58, which is pressed radially inward by the engaging stepped portion 68 of the sleeve 42, protrudes from the inner peripheral surface 40b of the cylindrical wall portion 40, as shown in FIG. 6B. It is displaced radially inward and becomes an engaging position where it engages with the connecting recess 30 . When the second ball 58 is at the engaging position, the engaging stepped portion 68 of the sleeve 42 is no longer engaged with the second ball 58 , and the engaging stepped portion 68 of the sleeve 42 is moved by the biasing force of the spring 66 to the stop ring. It is displaced to the coupling position where it engages 70 . When in this connecting position, the sleeve 42 supports the first ball 56 and the second ball 58 from the outside in the radial direction and retains them in the engaged position as shown in FIGS. 6A and 6B. The engagement of the first ball 56 with the guide groove 28 at the parallel portion 34 fixes the tool adapter 10 to the unit body 12 in the circumferential direction. Further, the tool adapter 10 is fixed to the unit main body 12 in the direction of the longitudinal axis L by engaging the second ball 58 with the connecting recess 30 . The tool adapter 10 is thus connected to the unit body 12 . When removing the tool adapter 10 from the unit main body 12, the sleeve 42 is positioned radially outside the engaging position of the first ball 56 and the second ball 58, and is released so that it does not engage with the guide groove 28 and the connecting recess 30. The tool adapter 10 is pulled out from the insertion hole 38 in a state of being displaced to the disconnection position that allows displacement to the position.
　工具アダプタ１０の連結軸部２０を挿入孔３８内に挿入していく際に、第１ボール５６がガイド溝２８に係合した後は、工具アダプタ１０はユニット本体１２に対して回転しながら進んでいく。そのため、工具アダプタ１０は押圧部材４４に対して相対的に回転することになる。しかしながら、連結軸部２０の後端面２０ｂと押圧部材４４の突部６４ａは径方向中心位置で当接しているため、工具アダプタ１０からの回転方向での力は押圧部材４４には殆ど伝わらない。そのため、工具アダプタ１０が回転しても押圧部材４４は実質的に回転しない。 When inserting the connecting shaft portion 20 of the tool adapter 10 into the insertion hole 38 , after the first ball 56 is engaged with the guide groove 28 , the tool adapter 10 advances while rotating with respect to the unit main body 12 . go. Therefore, the tool adapter 10 rotates relative to the pressing member 44 . However, since the rear end surface 20b of the connecting shaft portion 20 and the projection 64a of the pressing member 44 are in contact with each other at the center position in the radial direction, almost no rotational force from the tool adapter 10 is transmitted to the pressing member 44. Therefore, even if the tool adapter 10 rotates, the pressing member 44 does not substantially rotate.
　上述の連結操作を行なっているときの第１ボール５６とガイド溝２８との相対的位置の変化は、図３に示す通りとなる。なお、図３においては、ガイド溝２８に対して第１ボール５６が移動しているように描かれているが、実際には固定位置にある第１ボール５６に対してガイド溝２８が移動する。第１ボール５６がガイド溝２８から外れた位置Ｂ１にあるときには、第１ボール５６は押圧部材４４の外周面４４ａ又は連結軸部２０の外周面２０ａによって径方向内側から支持されて解放位置に保持されている（図１Ａ）。第１ボール５６の中心位置がガイド溝２８の上方にある位置Ｂ２になると、スリーブ４２によって径方向内側に押圧されている第１ボール５６によってガイド溝２８の縁が押されることにより連結軸部２０が回転する。これにより、第１ボール５６はガイド溝２８内に変位してガイド溝２８に係合した位置Ｂ３となる（図５Ａ）。このとき第１ボール５６は、中間位置に変位したスリーブ４２によって径方向外側から支持されて係合位置に保持されている。連結軸部２０がさらに挿入されると、第１ボール５６がガイド溝２８の傾斜部分３２に係合していることにより、連結軸部２０はガイド溝２８の傾斜部分３２に沿って回転しながら進んでいく。第１ボール５６がガイド溝２８の傾斜部分３２の前端の位置Ｂ４に至ると連結軸部２０の回転が止まり、さらに第１ボール５６がガイド溝２８の平行部分３４の位置Ｂ５に至ると、第２ボール５８が連結凹部３０と整合した位置となる。このように、第１ボール５６がガイド溝２８の傾斜部分３２の何れかの位置で係合すると、その後は連結軸部２０がガイド溝２８によって案内されながら挿入されていき、第２ボール５８が連結凹部３０と整合する位置となる。よって、第１ボール５６がガイド溝２８と何れかの位置で係合すれば、第１ボール５６とガイド溝２８の係合により、第２ボール５８が連結凹部３０と係合するように連結軸部２０が案内される。また、上述のように、連結軸部２０の外周面２０ａ上での各ガイド溝２８（２８－１、２８－２、２８－３）の周方向範囲Ｗ（Ｗ１、Ｗ２、Ｗ３）が、隣り合う別のガイド溝２８（２８－１、２８－２、２８－３）の周方向範囲Ｗ（Ｗ１、Ｗ２、Ｗ３）と重なるようになっているため、第１ボール５６とガイド溝２８（２８－１、２８－２、２８－３）との周方向での相対的位置がどの位置にある状態で連結軸部２０を挿入しても、第１ボール５６は何れかのガイド溝２８（２８－１、２８－２、２８－３）と係合するようになる。すなわち、ユニット本体１２に対して工具アダプタ１０を周方向でのどの位置で挿入しても、第１ボール５６はガイド溝２８に係合し、それにより第２ボール５８は連結凹部３０に係合するようになるため、工具アダプタ１０の周方向での位置を合わせることなく適切な連結を行なうことが可能となる。なお、第１ボール５６よりも前方に位置する第２ボールは、第１ボール５６がガイド溝２８に係合する前にガイド溝２８上を通過することがあるが、その時にはスリーブ４２は連結解除位置に保持されており第２ボール５８は解放位置に変位することが許容された状態となっているため、第２ボール５８は一時的にガイド溝２８と係合したとしてもガイド溝２８によってすぐに径方向外側に押されて解放位置に戻ることになる。また、第２ボール５８は、第１ボール５６がガイド溝２８に係合した後は、連結軸部２０の外周面２０ａ上を移動して連結凹部３０にまで至る。 Changes in the relative positions of the first ball 56 and the guide groove 28 during the connecting operation described above are as shown in FIG. Although FIG. 3 shows the first ball 56 moving with respect to the guide groove 28, the guide groove 28 actually moves with respect to the first ball 56 at the fixed position. . When the first ball 56 is at the position B1 away from the guide groove 28, the first ball 56 is supported from the inside in the radial direction by the outer peripheral surface 44a of the pressing member 44 or the outer peripheral surface 20a of the connecting shaft portion 20 and held at the release position. (Fig. 1A). When the center position of the first ball 56 reaches the position B2 above the guide groove 28, the edge of the guide groove 28 is pushed by the first ball 56, which is pressed radially inward by the sleeve 42, so that the connecting shaft portion 20 is moved. rotates. As a result, the first ball 56 is displaced into the guide groove 28 and reaches a position B3 where it engages with the guide groove 28 (FIG. 5A). At this time, the first ball 56 is supported from the outside in the radial direction by the sleeve 42 displaced to the intermediate position and held at the engagement position. When the connecting shaft portion 20 is further inserted, the connecting shaft portion 20 rotates along the inclined portion 32 of the guide groove 28 due to the engagement of the first ball 56 with the inclined portion 32 of the guide groove 28. move on. When the first ball 56 reaches the front end position B4 of the inclined portion 32 of the guide groove 28, the rotation of the connecting shaft portion 20 stops. The second ball 58 is aligned with the connecting recess 30 . Thus, when the first ball 56 engages at any position of the inclined portion 32 of the guide groove 28, the connecting shaft portion 20 is thereafter inserted while being guided by the guide groove 28, and the second ball 58 is inserted. The position is aligned with the connecting concave portion 30 . Therefore, if the first ball 56 engages with the guide groove 28 at any position, the engagement between the first ball 56 and the guide groove 28 causes the second ball 58 to engage with the connecting concave portion 30 , thereby moving the connecting shaft. A section 20 is introduced. Further, as described above, the circumferential ranges W (W1, W2, W3) of the guide grooves 28 (28-1, 28-2, 28-3) on the outer peripheral surface 20a of the connecting shaft portion 20 are adjacent to each other. Since it overlaps with the circumferential range W (W1, W2, W3) of another matching guide groove 28 (28-1, 28-2, 28-3), the first ball 56 and the guide groove 28 (28 -1, 28-2, and 28-3) in the circumferential direction, the first ball 56 remains in one of the guide grooves 28 (28 -1, 28-2, 28-3). That is, no matter where the tool adapter 10 is inserted into the unit main body 12 in the circumferential direction, the first ball 56 is engaged with the guide groove 28 and the second ball 58 is thereby engaged with the connecting recess 30. Therefore, it is possible to perform appropriate connection without adjusting the position of the tool adapter 10 in the circumferential direction. The second ball positioned forward of the first ball 56 may pass over the guide groove 28 before the first ball 56 engages with the guide groove 28, but at that time the sleeve 42 is disconnected. Since the position is held and the second ball 58 is allowed to be displaced to the release position, even if the second ball 58 is temporarily engaged with the guide groove 28, the guide groove 28 immediately releases the second ball 58. will be pushed radially outwardly to return to the release position. Further, after the first ball 56 is engaged with the guide groove 28 , the second ball 58 moves on the outer peripheral surface 20 a of the connecting shaft portion 20 and reaches the connecting concave portion 30 .
　このように当該工具取付ユニット１においては、工具アダプタ１０の連結軸部２０に傾斜部分３２を有するガイド溝２８が形成され、ユニット本体１２にガイド溝２８と係合する第１ボール５６が設けられており、第１ボール５６がガイド溝２８に係合することにより連結軸部２０の連結凹部３０がユニット本体１２の第２ボール５８と係合するように連結軸部２０が案内されるようになっている。そのため、ユニット本体１２に対して工具アダプタ１０の周方向での位置を精確に合わせる必要がない。また、各ガイド溝２８（２８－１、２８－２、２８－３）が形成されている周方向範囲Ｗ（Ｗ１、Ｗ２、Ｗ３）が重なっているため、ユニット本体１２に対して工具アダプタ１０を周方向でのどの位置で挿入しても、第１ボール５６は何れかのガイド溝２８（２８－１、２８－２、２８－３）と係合することになり、工具アダプタ１０の周方向での位置を合わせることなく適切な連結を行なうことが可能となる。 As described above, in the tool mounting unit 1, the guide groove 28 having the inclined portion 32 is formed in the connecting shaft portion 20 of the tool adapter 10, and the first ball 56 that engages with the guide groove 28 is provided in the unit main body 12. By engaging the first ball 56 with the guide groove 28 , the connecting shaft portion 20 is guided so that the connecting concave portion 30 of the connecting shaft portion 20 engages with the second ball 58 of the unit main body 12 . It's becoming Therefore, it is not necessary to precisely match the position of the tool adapter 10 with respect to the unit body 12 in the circumferential direction. In addition, since the circumferential ranges W (W1, W2, W3) in which the respective guide grooves 28 (28-1, 28-2, 28-3) are formed overlap each other, the tool adapter 10 is positioned relative to the unit main body 12. is inserted at any position in the circumferential direction, the first ball 56 will be engaged with any one of the guide grooves 28 (28-1, 28-2, 28-3). Appropriate connection can be made without directional alignment.
　別の実施形態においては、ガイド溝２８を１つのみとすることもできる。その場合には、ガイド溝２８の傾斜部分３２が連結軸部２０の外周面２０ａ上を螺旋状に少なくとも１周にわたって形成されるようにすることができる。傾斜部分３２が１周以上にわたって形成されていることにより、ユニット本体１２に対して工具アダプタ１０を周方向でのどの位置で挿入しても、第１ボール５６はガイド溝２８の何れかの位置で係合するようになり、工具アダプタ１０の周方向での位置を合わせることなく適切な連結を行なうことが可能となる。 In another embodiment, only one guide groove 28 may be provided. In that case, the inclined portion 32 of the guide groove 28 can be formed spirally over at least one round on the outer peripheral surface 20a of the connecting shaft portion 20 . Since the inclined portion 32 is formed over one or more turns, the first balls 56 can be positioned at any position in the guide groove 28 regardless of the position of the tool adapter 10 inserted into the unit body 12 in the circumferential direction. It is possible to perform proper connection without adjusting the position of the tool adapter 10 in the circumferential direction.
　以上に本発明の実施形態について説明をしたが、本発明はこれら実施形態に限定されるものではない。例えば、上記実施形態においては、ガイド溝２８が３つ形成されているが、ガイド溝の数は任意に変更可能であり、例えば２つとしたり４つ以上としたりすることもできる。スリーブは筒状部材の長手軸線の方向に変位するようになっているが、周方向に回転して連結位置と連結解除位置との間で変位するようにしてもよい。また連結凹部は、周方向に延びる１つの環状の凹部としてもよい。押圧部材における突部は、押圧部材の前端部と一体的に形成されたものとしてもよい。 Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in the above-described embodiment, three guide grooves 28 are formed, but the number of guide grooves can be changed arbitrarily, for example, two or four or more. Although the sleeve is adapted to be displaced along the longitudinal axis of the tubular member, it may be displaced circumferentially between the coupled and uncoupled positions. Also, the connecting recess may be a single annular recess extending in the circumferential direction. The protrusion of the pressing member may be formed integrally with the front end of the pressing member.
１　　工具取付ユニット
１０　工具アダプタ
１２　ユニット本体
１４　ユニット取付部
１６　アダプタ本体
１８　キャップ
２０　連結軸部
２０ａ　外周面
２０ｂ　後端面
２２　工具固定部
２４　フランジ
２６　工具取付孔
２８（２８－１、２８－２、２８－３）　ガイド溝
３０　連結凹部
３２　傾斜部分
３４　平行部分
３６　前端開口
３８　挿入孔
４０　筒状壁部
４０ａ　外周面
４０ｂ　内周面
４０ｃ　前端面
４２　スリーブ
４２ａ　内周面
４４　押圧部材
４４ａ　外周面
４６　ボールベアリング
４８　ベベルギヤ
５０　ベベルギヤ
５２　第１ボール保持孔
５４　第２ボール保持孔
５６　第１ボール
５８　第２ボール
６０　スプリング（付勢部材）
６２　前端部
６４　当接ボール
６４ａ　突部
６６　スプリング（付勢部材）
６８　係合段部
７０　ストップリング
Ｂ１、Ｂ２、Ｂ３、Ｂ４、Ｂ５　位置
Ｌ　長手軸線
Ｐ１、Ｐ２、Ｐ３、Ｐ４、Ｐ５、Ｐ６　位置
Ｗ（Ｗ１、Ｗ２、Ｗ３）　周方向範囲 1 Tool mounting unit 10 Tool adapter 12 Unit main body 14 Unit mounting portion 16 Adapter main body 18 Cap 20 Connecting shaft portion 20a Outer peripheral surface 20b Rear end surface 22 Tool fixing portion 24 Flange 26 Tool mounting hole 28 (28-1, 28-2, 28 -3) Guide groove 30 Connecting recess 32 Inclined portion 34 Parallel portion 36 Front end opening 38 Insertion hole 40 Cylindrical wall portion 40a Outer peripheral surface 40b Inner peripheral surface 40c Front end surface 42 Sleeve 42a Inner peripheral surface 44 Pressing member 44a Outer peripheral surface 46 Ball bearing 48 bevel gear 50 bevel gear 52 first ball retaining hole 54 second ball retaining hole 56 first ball 58 second ball 60 spring (biasing member)
62 front end 64 contact ball 64a projection 66 spring (biasing member)
68 Engagement stepped portion 70 Stop ring B1, B2, B3, B4, B5 Position L Longitudinal axis P1, P2, P3, P4, P5, P6 Position W (W1, W2, W3) Circumferential direction range

Claims (9)

  1. 　工具アダプタと、前記工具アダプタが着脱可能に連結されるユニット本体とを備える工具取付ユニットであって、
    　前記工具アダプタは、
    　　連結軸部と、
    　　前記連結軸部の外周面上に形成され、前記外周面に沿って前記連結軸部の長手軸線に対して斜めに延びる傾斜部分を有するガイド溝と、
    　　前記連結軸部の外周面上に形成された連結凹部と、
    　を備え、
    　前記ユニット本体は、
    　　前端開口から後方に延びて前記連結軸部を受け入れるようにされた挿入孔を画定し、径方向に貫通する第１ボール保持孔及び第２ボール保持孔を有する筒状壁部と、
    　　前記第１ボール保持孔内で、前記筒状壁部の内周面から径方向内側に突出して前記ガイド溝と係合する係合位置と、前記係合位置よりも径方向外側の位置であり前記ガイド溝と係合しない解放位置との間で変位可能に配置された第１ボールと、
    　　前記第２ボール保持孔内で、前記筒状壁部の内周面から径方向内側に突出して前記連結凹部と係合する係合位置と、前記係合位置よりも径方向外側の位置であり前記連結凹部と係合しない解放位置との間で変位可能に配置された第２ボールと、
    　　前記筒状壁部の外側で連結解除位置と連結位置との間で変位可能に配置され、前記連結解除位置では前記第１ボール及び前記第２ボールが前記解放位置に変位することを許容し、前記連結解除位置と前記連結位置との間の中間位置では前記第１ボールを前記係合位置に保持し、前記第２ボールが前記解放位置に変位することを許容し、前記連結位置では前記第１ボール及び前記第２ボールを前記係合位置に保持するようにされたスリーブと、
    　を備え、
    　前記スリーブが前記連結解除位置にある状態で前記工具アダプタの前記連結軸部を前記ユニット本体の前記挿入孔内に挿入して前記ガイド溝の前記傾斜部分が前記第１ボールと整合する位置となったときに、前記第１ボールが前記スリーブに押されて前記係合位置となり前記傾斜部分において前記ガイド溝に係合するとともに前記スリーブが前記中間位置にまで変位し、前記連結軸部を前記ガイド溝によって案内されながら所定の取付位置にまでさらに挿入したときに、前記連結凹部が前記第２ボールと整合する位置となって前記第２ボールが前記スリーブに押されて前記係合位置となり前記連結凹部と係合するとともに前記スリーブが前記連結位置にまで変位するようにされた、工具取付ユニット。     A tool mounting unit comprising a tool adapter and a unit body to which the tool adapter is detachably connected,
    The tool adapter is
    a connecting shaft;
    a guide groove formed on the outer peripheral surface of the connecting shaft portion and having an inclined portion extending obliquely along the outer peripheral surface with respect to the longitudinal axis of the connecting shaft portion;
    a connecting recess formed on the outer peripheral surface of the connecting shaft;
    with
    The unit body is
    a tubular wall portion defining an insertion hole extending rearwardly from a front end opening adapted to receive said connecting shaft portion and having a first ball retaining hole and a second ball retaining hole extending radially therethrough;
    In the first ball holding hole, an engaging position protruding radially inward from the inner peripheral surface of the cylindrical wall portion and engaging with the guide groove, and a position radially outward from the engaging position. a first ball arranged to be displaceable between a release position that does not engage with the guide groove;
    In the second ball holding hole, an engagement position where the coupling recess protrudes radially inward from the inner peripheral surface of the cylindrical wall portion and engages with the connecting recess, and a position radially outside the engagement position. a second ball arranged to be displaceable between a release position that does not engage with the connecting recess;
    Displaceable between a disconnection position and a connection position on the outside of the tubular wall, the first ball and the second ball being displaced to the release position at the disconnection position, At an intermediate position between the disconnection position and the connection position, the first ball is held at the engagement position and the second ball is allowed to be displaced to the release position. a sleeve adapted to hold one ball and said second ball in said engaged position;
    with
    With the sleeve at the disconnecting position, the connecting shaft portion of the tool adapter is inserted into the insertion hole of the unit body, and the inclined portion of the guide groove is aligned with the first ball. When the first ball is pushed by the sleeve to reach the engagement position, the first ball is engaged with the guide groove at the inclined portion, and the sleeve is displaced to the intermediate position to move the connecting shaft portion to the guide position. When the sleeve is further inserted to a predetermined mounting position while being guided by the groove, the connecting recess is positioned to align with the second ball, and the second ball is pushed by the sleeve to reach the engaging position and the connecting position. A tool attachment unit adapted to engage the recess and displace the sleeve to the coupling position.
  2. 　前記ガイド溝が周方向で等間隔に並んで複数設けられており、該連結軸部の外周面上での各ガイド溝が形成されている周方向範囲が、隣り合う別のガイド溝が形成されている周方向範囲と部分的に重なるようにされた、請求項１に記載の工具取付ユニット。 A plurality of the guide grooves are arranged at equal intervals in the circumferential direction, and adjacent guide grooves are formed in the circumferential range in which each guide groove is formed on the outer peripheral surface of the connecting shaft portion. 2. A tool attachment unit according to claim 1, adapted to partially overlap the circumferential extent of the tool attachment unit.
  3. 　前記ガイド溝の前記傾斜部分が前記連結軸部の外周面上を螺旋状に少なくとも１周にわたって形成されている、請求項１に記載の工具取付ユニット。 The tool mounting unit according to claim 1, wherein the inclined portion of the guide groove is spirally formed over at least one round on the outer peripheral surface of the connecting shaft portion.
  4. 　前記ガイド溝が、前記傾斜部分の前端から前方に前記長手軸線と平行に延びる平行部分を有し、
    　前記第２ボールが前記連結凹部と係合したときに、前記第１ボールは前記平行部分において前記ガイド溝と係合しているようにされた、請求項１乃至３の何れか一項に記載の工具取付ユニット。     the guide groove has a parallel portion extending forward from the front end of the inclined portion parallel to the longitudinal axis;
    4. The apparatus according to any one of claims 1 to 3, wherein said first ball is engaged with said guide groove at said parallel portion when said second ball is engaged with said connecting recess. tool mounting unit.
  5. 　前記第１ボールが前記ガイド溝に係合することにより前記工具アダプタが前記ユニット本体に対して前記工具アダプタの周方向で固定され、前記第２ボールが前記連結凹部に係合することにより前記工具アダプタが前記ユニット本体に対して前記長手軸線の方向で固定されるようにされた、請求項１乃至４の何れか一項に記載の工具取付ユニット。 The first ball engages with the guide groove to fix the tool adapter to the unit body in the circumferential direction of the tool adapter, and the second ball engages with the connecting recess to fix the tool adapter. 5. A tool mounting unit according to any one of claims 1 to 4, wherein an adapter is adapted to be fixed to said unit body in the direction of said longitudinal axis.
  6. 　前記第１ボールと前記第２ボールが、前記筒状壁部の周方向及び長手軸線の方向で相互にずれた位置にある、請求項１乃至５の何れか一項に記載の工具取付ユニット。 The tool mounting unit according to any one of claims 1 to 5, wherein the first ball and the second ball are located at mutually displaced positions in the circumferential direction and the longitudinal axis direction of the cylindrical wall portion.
  7. 　前記ユニット本体が、前記挿入孔内で前記筒状壁部の長手軸線の方向に変位可能に配置された押圧部材と、前記押圧部材を前方に付勢する付勢部材とをさらに備え、前記連結軸部が前記挿入孔に挿入されたときに前記押圧部材が前記連結軸部を前方に押圧するようにされた、請求項１乃至６の何れか一項に記載の工具取付ユニット。 The unit main body further includes a pressing member displaceable in the insertion hole in the direction of the longitudinal axis of the cylindrical wall portion, and a biasing member that biases the pressing member forward, and the coupling is performed. The tool attachment unit according to any one of claims 1 to 6, wherein the pressing member presses the connecting shaft forward when the shaft is inserted into the insertion hole.
  8. 　前記押圧部材は、前端部と、前記前端部に設けられ前記前端部の径方向中心位置において前方に突出した突部を有し、前記連結軸部が前記挿入孔に挿入されたときに、前記突部が前記連結軸部の端面に径方向中心位置で当接するようにされた、請求項７に記載の工具取付ユニット。 The pressing member has a front end and a protrusion provided at the front end and protruding forward at a radial center position of the front end. 8. The tool mounting unit according to claim 7, wherein the protrusion abuts on the end surface of the connecting shaft portion at the center position in the radial direction.
  9. 　前記ユニット本体が、前記連結解除位置から前記連結位置に向かう方向に前記スリーブを付勢する付勢部材をさらに備え、
    　前記押圧部材は、前記連結軸部を前記挿入孔に挿入していない状態において、前記第１及び第２ボールを径方向内側から支持して前記解放位置に保持するようにされ、
    　前記スリーブは、前記押圧部材によって前記解放位置に保持された前記第１ボールに対して前記連結位置に向かう方向で押し付けられて前記連結解除位置に保持され、前記第１ボールが前記係合位置に変位したときには前記連結軸部の外周面によって前記解放位置に保持された前記第２ボールに対して前記連結位置に向かう方向で押し付けられて前記中間位置に保持されるようにされた、請求項７又は８に記載の工具取付ユニット。     the unit body further comprises a biasing member that biases the sleeve in a direction from the disconnection position toward the connection position;
    The pressing member supports the first and second balls from the radially inner side and holds them at the release position in a state in which the connecting shaft portion is not inserted into the insertion hole,
    The sleeve is held at the disconnecting position by being pressed in a direction toward the connecting position against the first ball held at the releasing position by the pressing member, and the first ball moves to the engaging position. 8. When displaced, the outer peripheral surface of said connecting shaft portion presses against said second ball held at said released position in a direction toward said connecting position so as to be held at said intermediate position. Or the tool mounting unit according to 8.
PCT/JP2022/042991 2022-02-04 2022-11-21 Tool attachment unit WO2023149054A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131393B1 (en) * 1967-09-15 1976-09-06
JPS5379476U (en) * 1976-12-06 1978-07-01
JPS6014825U (en) * 1983-07-08 1985-01-31 富士精工株式会社 cutting tool holder
JPH01159106A (en) * 1987-10-08 1989-06-22 Hertel Ag Werkzeuge & Hartstoff Device for clamping tool head to drive spindle for machine tool in exchangeable manner
JPH02107411U (en) * 1989-02-10 1990-08-27
JP2019058973A (en) * 2017-09-26 2019-04-18 エヌティーツール株式会社 Tool holder
JP2019107740A (en) * 2017-12-19 2019-07-04 株式会社 ムラテクノロジー Base shaft holder and electric power tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131393B1 (en) * 1967-09-15 1976-09-06
JPS5379476U (en) * 1976-12-06 1978-07-01
JPS6014825U (en) * 1983-07-08 1985-01-31 富士精工株式会社 cutting tool holder
JPH01159106A (en) * 1987-10-08 1989-06-22 Hertel Ag Werkzeuge & Hartstoff Device for clamping tool head to drive spindle for machine tool in exchangeable manner
JPH02107411U (en) * 1989-02-10 1990-08-27
JP2019058973A (en) * 2017-09-26 2019-04-18 エヌティーツール株式会社 Tool holder
JP2019107740A (en) * 2017-12-19 2019-07-04 株式会社 ムラテクノロジー Base shaft holder and electric power tool

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