JPH09225709A - Tool holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holding device which is provided with a member to hold a machining tool and a member to hold the member and be fixed to a machine tool side, and is excellent in the reliability. SOLUTION: An engagement piece 124 of a collar fitted to a drill holder 36 is provided with an engagement part 126 of the constant width on a base end part and a one-side inclined engagement part 132 in which one of two parallel side surfaces in the axial direction is inclined on a projected end part, and the engagement part 126 of the constant width is fitted to a notch of the constant width. A one-side inclined notch 200 of the inclination corresponding to the one-side inclined engagement part 132 is formed on a tip part of a sleeve 10. When the drill holder 36 is fitted to the sleeve 10, the one-side inclined engagement part 132 is engaged with the one-side inclined notch 200 without any clearance in the rotational direction, and the abutting of parallel surfaces 128, 204, and parallel surfaces of the notch 114 of the constant width and the engagement part 126 of the constant width prevents the relative rotation of the sleeve 10 to the drill holder 36, and no force in the axial direction is applied to the engagement piece 124, preventing it from coming off the one-side inclined notch 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holding device for attaching a machining tool to a machine tool,
Particularly, it relates to improvement of reliability.

[0002]

2. Description of the Related Art In some tool holding devices, a member for holding a machining tool is attached to a machine tool via another member. And in this kind of tool holding device, (a)
A first member having a first engaging notch extending in the axial direction parallel to the axis and fixed to the machine tool side; (b) a machining tool holding portion for holding a machining tool; and a second engaging notch extending in the axial direction. And a second member fitted with the first member so as to be rotatable relative to the first member, and (c) engageable across the first engaging notch and the second engaging notch. The first and second members are engaged with each other by axially moving relative to one of the first and second members, straddling the first and second engagement notches. A relative rotation limiting member held in a state in which it can be in an operating position that prevents relative rotation of the two members exceeding a limited angle and a non-operating position that disengages from at least one of the first and second engagement notches; d) Some include a biasing unit that biases the relative rotation limiting member in a direction of moving from the non-acting position side to the working position side.

The tool holding device described in Japanese Utility Model Publication No. 5-46802 is an example. This tool holding device is a device for attaching a machining tool to a spindle of a machine tool, and an adapter attached to the spindle, a tool holder that holds the machining tool and is attached to and detached from the adapter, and an outside of the tool holder. And a collar which is fitted and which transmits the rotation of the adapter to the tool holder. The adapter has a bottomed fitting hole and an annular groove at the opening side of the fitting hole, so that a radially inward inward flange is formed at the distal end of the adapter. Are formed. The adapter also has four first engaging notches that extend axially from the opening-side end surface of the fitting hole, have a depth that is deeper than the thickness of the inward flange and reach the annular groove, and have a constant width, It is formed at equal angular intervals.

The tool holder is provided with a working tool holding portion and a fitting portion, and a radially outward flange portion provided at an end of the fitting portion on the working tool holding portion side has a diametrical direction. A second engagement notch having a constant width is formed in each of the two separated positions so as to penetrate therethrough in the axial direction. Further, in the portion of the fitting portion near the flange portion, four radial protrusions extending outward in the radial direction are arranged at equal angular intervals and at a position different in phase from the second engaging notch by 45 degrees. It is provided. The collar has a cylindrical shape, and axial protrusions having a constant width are protrudingly provided at two diametrically spaced positions on one end surface of the two axially separated end surfaces. The collar is fitted in the machining tool holding portion, and is urged by a spring in such a direction that the axial projection engages with the second engaging notch of the flange portion.

When attaching the tool holder to the adapter,
With the radial projection and the first engagement notch in phase, insert the mating part into the mating hole until the flange contacts the tip surface of the adapter, and insert the radial projection into the annular groove. After being rotated, it is rotated and the radial projection is axially and non-disengageably engaged with the inward flange. That is, the inward flange of the adapter is sandwiched between the flange portion of the tool holder and the radial projection, and as a result, a small distance that limits the relative movement of the tool holder in the axial direction with respect to the adapter. Limited to. When the tool holder is inserted into the fitting hole of the fitting part, the phase of the axial projection of the collar and the first engagement notch of the adapter are shifted by 45 degrees, and the axial projection comes into contact with the tip surface of the adapter. , The collar is separated from the flange, but if the tool holder is rotated and the phases of the axial projection and the first engaging notch match, the collar is moved by the urging force of the spring and axially moves. The protrusion fits into the first engagement notch. The axial projection is engaged across the tool holder and the adapter, and the rotation of the adapter is transmitted to the tool holder. Therefore, the tool holder is attached to the spindle through the adapter by a simple operation so as to be relatively immovable, and machining is performed by the machining tool held by the tool holder as the spindle rotates.

[0006]

However, this tool holding device has a problem that it lacks reliability. During machining, the axial projection may come out of the first engagement notch of the adapter, and the tool holder may become rotatable relative to the adapter. Since the collar provided with the axial projection is biased by the biasing means in the direction of moving from the non-acting position side to the working position side, the axial projection cannot escape from the first engaging notch. Actually, I gradually get out. The cause is unknown, but if the axial projection comes out of the first engaging notch, the tool holder will be able to rotate relative to the adapter, that is, to the spindle, making it impossible to continue machining. In some cases, the tool holder may even come off the adapter. In the first invention according to claim 1, in the background of the above circumstances, the second member is the first member due to an unexplained withdrawal of the axial projection during machining by relative rotation of the tool holding device and the workpiece in one direction. The object of the present invention is to obtain a highly reliable tool holding device that does not rotate relative to the tool holding device according to the second aspect of the present invention. The object of the present invention is to obtain a tool holding device in which the second member does not become rotatable relative to the first member even when the workpiece and the workpiece are relatively rotated in both the forward and reverse directions. It is a thing.

[0007]

Means for Solving the Problems, Functions and Effects of the Invention
In order to solve the above-mentioned problems, the first invention provides the above (a).
In a tool holding device including a first member, (b) second member, (c) relative rotation limiting member, and (d) biasing means, at least one of the first engagement notch and the second engagement notch, One of the two side surfaces extending in the axial direction is a parallel surface parallel to the axial direction, and the other is a one-sided cutout that is an inclined surface that is inclined toward the parallel surface toward the working position side from the non-working position side, On the other hand, two side surfaces extending in the axial direction are notches having a constant width that are parallel surfaces parallel to the axial direction, and a portion of the engaging piece that engages with the one-sided inclined notch corresponds to an inclined surface of the one-sided inclined notch. A one-sided inclined engaging portion having an inclined surface, a portion of the engaging piece engaged with the constant width notch is a constant width engaging portion, and the one-sided inclined notch and the one-sided inclined engaging portion Each parallel surface on the side opposite to each inclined surface is processed by the tool holder. It is an summarized in that provided in a position to prevent relative rotation between the second member and the first member based on the machining resistance is brought into contact with each other by machining resistance against.

In this device, one of the first and second engaging cutouts is a one-sided cutout, and one of the first and second engaging cutouts of the engaging piece engages with the one-sided cutout. The mating portion may be a one-sided inclined engaging portion, or both the first and second engaging cutouts may be a one-sided inclined notch, and any portion of the engaging piece that engages with the first and second engaging cutouts may be formed. It may be a one-sided inclined engaging portion. In the latter case, one of the parallel surfaces of the two-piece inclined engaging portions of the engaging piece is provided on one of the pair of side surfaces extending in the axial direction of the engaging piece, and the other of the parallel surfaces is on the other side surface. It is provided. In addition, each parallel surface of the two unilateral inclined notches,
In the engaged state of the one-sided inclined engaging portions, the two parallel-sided surfaces of the two one-sided inclined notches and the two parallel surfaces of the one-sided inclined engaging portions are provided at positions opposite to each other in the rotation direction. They are formed in a position where they are brought into contact with each other by the working resistance and prevent relative rotation of the first and second members due to the working resistance.

If the relative rotation between the first member and the second member due to the processing resistance is prevented by the contact between the inclined surfaces, the action of the inclined surfaces causes the engaging pieces to come out of the first and second engaging notches. The power of is added. If the pushing force of the engagement piece due to the action of the inclined surface is smaller than the sum of the frictional force between the engagement piece and the first and second engagement notches and the urging force of the urging means, the engagement piece is
It is apt to be considered not to slip out from the second engagement notch, but in reality, the friction coefficient apparently becomes smaller due to vibration, so even if the inclination angle of the inclined surface is made considerably smaller, It comes out from the second engagement notch (the engagement notch formed in the member opposite to the member holding the relative rotation limiting member of the first and second members). On the other hand, in the tool holding device according to the first invention and the conventional tool holding device in which the engaging piece and the first and second engaging notches all have a constant width, the first is based on the machining resistance. Since the relative rotation between the member and the second member is prevented by the contact between the parallel surfaces, the engaging piece is not pulled out from the first and second engaging pieces due to the action of the inclined surface.

However, in the conventional tool holding device, the engaging piece is pulled out from the engaging notch as described above,
It does not occur in the tool holding device according to the first invention. The reason is unknown, but as will be described later in the section of the embodiment of the invention, in the conventional tool holding device, the engaging piece comes out from the engaging notch, in the tool holding device according to the first invention, It has been confirmed by experiments that it will not escape. According to the first aspect of the present invention, it is possible to prevent a situation in which the engagement piece comes out of the engagement notch and the first and second members become relatively rotatable, and it becomes impossible to continue the machining, and a highly reliable tool holding is achieved. The device is obtained.

In the first aspect of the invention, the limit of movement of the relative rotation limiting member from the non-acting position side to the acting position side is defined by the engagement of the one-sided inclined notch and the one-sided inclined engaging portion. desirable. This is because at least one of the first and second engagement notches and the engagement piece engage with each other without a gap in the rotation direction, and the amount of relative rotation between the first member and the second member can be reduced. If one of the first engagement notch and the second engagement notch is a one-sided inclined notch, and the portion of the engagement piece that engages with the one-sided inclined notch is a one-sided inclined engaging part, the one-sided inclined engaging part The contact surface of the relative rotation limiting member comes into contact with the inclined surface of the one-sided cutout to define the movement limit of the relative rotation limiting member. Further, both the first and second engaging notches are one-sided inclined notches, and the portions of the engaging pieces that engage with the first and second engaging notches are all one-sided inclined engaging portions,
The movement limit of the relative rotation limiting member is defined by the contact of the inclined surface of one of the one-sided inclined engaging portions with the engaging surface of the one-sided inclined notch. In the former case, a clearance in the rotation direction must be provided in order to engage the constant width engaging portion and the constant width notch, but the one-sided inclined engaging portion and the one-sided inclined notch engage without a clearance in the rotational direction. Can be made. Therefore, if the size of the clearance between the constant width engaging portion and the constant width notch is made equal to the size of the conventional clearance between the constant width engaging piece and the engaging notch, the engagement piece The clearance in the rotational direction between the first and second engagement notches can be made smaller than in the conventional case, and thereby the relative rotatable amount between the first member and the second member is reduced. This causes the first member and the processing tool held by it to vibrate against the second member during processing,
The service life of the processing tool is reduced, or the side surface of the engaging piece and the engaging notch or each part of the tool holding device repeatedly collides and slides, and the side surface of the engaging piece and engaging notch or each part of the tool holding device is lost. It is possible to suppress the occurrence of a situation in which (plastic deformation) or wear occurs and the life of the tool holding device is shortened.

In the latter case, both the first and second engagement notches are one-sided inclined notches, but it is practically not expected that both of them engage with the engaging piece without a clearance in the rotation direction.
One of the first and second engagement notches engages with the engagement piece without a clearance in the rotational direction, but it is inevitable that a clearance remains between the other engagement notch and the engagement piece. Of. However, since the width of the part of the one-sided slant notch on the non-acting position side is larger than the width of the end of the one-side slant engaging part of the engaging piece on the side of the working position, the one-sloping notch and the one-side slanted part are engaged with each other. In this case, it is not necessary to intentionally provide a clearance as in the case of engaging the constant width engaging portion and the constant width notch. By design, when the first and second engaging cutouts and the engaging pieces are engaged, the widths of the portions corresponding to each other can be made equal to each other, and when either one engages without clearance The other clearance can be almost zero. Therefore, the relative rotatable amount of the first and second members can be made particularly small.

In the tool holding device according to the second aspect of the present invention, the relative rotation limiting member according to the first aspect of the present invention has two engaging pieces, and the inclined inclination engaging portions of the two engaging pieces are the same as the first member. It is characterized in that it is formed so as to prevent relative rotation with respect to the second member in the forward and reverse directions, respectively.

In this apparatus, the parallel surface of the one-sided inclined engaging portion of the one engagement piece is brought into contact with the parallel surface of the one-sided inclined notch corresponding to the relative rotation of the processing tool and the object in the positive direction. , The relative rotation of the first member and the second member based on the processing resistance is blocked, and the parallel surface of the one-sided inclined engaging portion of the other engaging piece is at the time of relative rotation in the opposite direction between the processing tool and the workpiece. The relative rotation between the first member and the second member is prevented by the contact with the parallel surface of the corresponding one-sided notch. Similar to the conventional tool holding device in which the widths of the first and second engaging cutouts and the engaging pieces are constant, the engaging pieces move the first and second engaging pieces by the action of the inclined surface at the time of relative rotation in both forward and reverse directions. In addition to the fact that no force is pushed out from the engagement notch and the unexplained removal of the engaging piece does not occur as in the prior art, a highly reliable tool holding device can be obtained. For example, when the processing tool is a tap and the tap and the workpiece are relatively rotated in the positive direction to form a female screw, cutting resistance and frictional resistance are applied to the tap. When the tap is rotated in the opposite direction to that during machining and is extracted from the machined female screw hole, no cutting resistance is added but frictional resistance is added. A large rotation resistance is added to the tap when rotating in either forward or reverse direction,
If the engagement piece is configured to prevent only relative rotation of the first and second members based on cutting resistance by abutting parallel surfaces,
While the engaging piece may come out of the engagement notch when the tap is withdrawn from the processed hole, according to the second aspect of the invention, the engaging piece may come out of the engagement notch even when the tap is taken out of the processed hole. There is no.

[0015]

Desirable Embodiments of the Invention The present invention can be implemented in the following aspects in addition to the aspects of claims 1 and 2 above. The embodiments are conveniently described as an embodiment of the same type as the claims. (1) Furthermore, a first engaging portion provided on the first member,
It is provided on the second member, and can be fitted into and disengaged from the first engaging portion in the axial direction in the non-engaging phase, and is relatively rotated from the non-engaging phase in the axially fitted state. The tool holding device according to claim 1 or 2, further comprising a first engagement portion and a second engagement portion that reaches an engagement phase in which the first engagement portion is engaged in an axially non-separable manner. In the device of this aspect, the first engaging portion and the second engaging portion are relatively moved in the axial direction in the state of being in the non-engaging phase to be engaged with each other, and then are relatively rotated to be engaged with each other. The second member is attached to the first member in an axially non-separable manner. Further, the second member can be removed from the first member by relatively rotating the first engaging portion and the second engaging portion from the engaging phase to the non-engaging phase and then relatively moving in the axial direction. it can. By the axial fitting and rotation, the second member, that is, the working tool, can be easily and quickly attached to and detached from the first member. (2) The relative rotation limiting member has a tubular shape, and is relatively rotatable and axially relative to each other between the machining tool holding portion of the second member and the flange portion extending outward in the radial direction. The second engaging notch is a movably fitted collar, and the engaging piece projects from the end surface of the collar on the side of the flange, while axially penetrating it in the flange. The tool holding device according to claim 1 or 2, wherein the tool holding device is formed. (3) The relative rotation limiting member has two or more engaging pieces, and the one-sided inclined engaging portions of the two or more engaging pieces are the processing resistances of the first member and the second member. The tool holding device according to claim 1, wherein the tool holding device is formed so as to prevent only relative rotation based on the above item. In this device, the parallel surfaces of the one-sided inclined engaging portions of the two or more engaging pieces and the parallel surfaces of the one-sided inclined engagement notches are brought into contact with each other, and relative rotation based on the processing resistance between the first member and the second member is performed. Block. As in the case where the tap is used as the processing tool, if the processing tool and the workpiece are not rotated relative to each other in the opposite direction to the processing, all the one-sided tilt engaging parts are set to the first and second positions. It is sufficient to form the member in such a direction as to prevent relative rotation due to the processing resistance of the member. (4) The tool holding device according to any one of claims 1 and 2 and embodiments 1 to 3, wherein the biasing means includes a spring. (5) The tool holding device according to any one of claims 1 and 2 and embodiments 1 to 4, wherein the first member has a mounting portion that is detachably mounted on a spindle of a machine tool. In the device of this aspect, the second member is attachable / detachable to / from the first member, and the first member itself is also attachable / detachable to / from the spindle, so that the usability of the tool holding device is improved. For example, the first member can be attached to and detached from the machine tool by the automatic tool changer, and the second member held by the first member can be exchanged outside the machine. (6) the first member and the second member has a first abutment surface and a second abutment surface that can abut each other in a state where the both members are fitted together, and, 6. The tool holding device according to claim 1, further comprising a contact state maintaining device that keeps the first contact surface and the second contact surface in contact with each other. Tool holding device. According to the apparatus of this aspect, the first contact surface and the second contact surface are kept in the contact state by the contact state maintaining device, so that the first member and the second member are relatively axially opposed to each other. Movement is blocked. Therefore, as the first member and the second member repeatedly move relative to each other in the axial direction during machining, each part of the tool holding device repeatedly collides and slides, causing fatigue and wear, and shortening the life. Is well avoided. Further, it is possible to favorably prevent the machining tool from being damaged due to the relative movement of the first member and the second member in the axial direction. (7) In the fitted state of the first member and the second member, a radial relative movement reducing device is included that reduces the radial relative movement based on the fitting clearance of the first and second members. , 2, the tool holding device according to any one of the first to sixth embodiments. Here, the “reduction” includes a case where relative movement occurs, but a case where the relative movement is reduced as compared with the case where the radial relative movement reduction device is not provided, and a case where the relative movement is set to zero. In the latter case, the radial relative movement reduction device is a radial relative movement prevention device that prevents relative movement in the radial direction based on the fitting clearance between the first member and the second member. If the radial relative movement reducing device is provided in this manner, the relative movement between the first member and the second member is reduced or eliminated, and the relative movement between the two lowers the machining accuracy, or the relative movement between the two causes. As a result, it is possible to favorably prevent the respective parts of the tool holding device from repeatedly colliding and sliding, causing fatigue and wear, and shortening the life. (8) In the fitted state of the first member and the second member, the rotation direction based on the engagement clearance between the engagement pieces of the first and second members and the first and second engagement notches 2. A micro rotation preventing device for preventing micro relative movement is included.
2. The tool holding device according to any one of the first to seventh embodiments. In this device, minute relative movement in the rotation direction based on the engagement clearance between the first member and the second member is prevented, and the collision between the engagement piece and the first and second engagement notches due to relative rotation, The life of the tool holder is prevented from being shortened due to fatigue and wear caused by repeated collision and sliding of various parts of the tool holder. Relative rotation of the first member and the second member in both the forward and reverse directions occurs in various cases. For example, when performing boring with a boring tool, if the prepared hole is eccentric, the blade repeatedly hits and disengages the inner peripheral surface of the prepared hole, and when it comes off, the cutting resistance suddenly disappears. It causes the boring tool to rotate in the opposite direction. When machining a through hole with a drill, when the tip of the drill comes out of the through hole, the cutting resistance may suddenly disappear and the drill may rotate in the opposite direction, but these rotations are blocked. Of. (9) The contact state maintaining device has an engaging portion, an engaging member fitted to one of the first member and the second member so as to be movable in the axial direction, and the first member. It is provided on the other of the second member and the second member, and is engageable with and disengageable from the engaging portion in the axial direction in the non-engaging phase, and has a constant angle from the non-engaging phase in the axially engaged state. The engaged member that is axially engaged by the engaging portion in the relatively rotated engaging phase, and the engaging member in the state where the engaging portion and the engaged portion are in the engaging phase. In a direction in which the first contact surface and the second contact surface are brought into contact with each other on the engaging member while moving in the axial direction to engage the engaging portion and the engaged portion in the axial direction. The tool holding device according to the sixth aspect, which includes an attraction force applying device that applies an attraction force. (10) The tool holding device according to embodiment 9, wherein the attracting force applying device includes a biasing means and a converting device for converting the biasing force of the biasing means into the attracting force of the engaging member. . The conversion device may change the magnitude of the urging force of the urging means, for example, to boost and convert the urging force into the attractive force, or to convert the urging force into the attractive force as it is. Good. (11) Among the first member and the second member, the engaging member is
The engaging member is fitted to the fitted member in a non-rotatable manner,
The attraction force applying device includes a movable member that is axially movably fitted to a member, of the first member and the second member, to which the engaging member is fitted, the urging means. Is for urging the movable member in a direction in which the first member and the second member are in a fitted state, toward the member in which the movable member is not fitted, and the conversion device is movable. 11. The tool holding device according to item 10, wherein an operating force based on the biasing force of the biasing means of the member is converted into the attraction force. (12) The conversion device, a first inclined surface provided on the movable member, and a transmitter that is held by the engagement member so as to be movable in the radial direction and that engages with the first inclined surface. A second sloped surface that is provided in the first member and the second member into which the engagement member is fitted, and that engages with the transmission element, and includes the first sloped surface and the second sloped surface. The direction and the inclination angle of the inclination with the second inclined surface are determined to be the direction and the inclination angle for converting the urging force applied to the movable member by the urging unit into the attractive force of the engaging member while boosting the urging force. The tool holding device according to the eleventh embodiment. When the movable member is biased and moved by the biasing means, the first inclined surface moves the transmitter in the axial direction and the radial direction to engage the second inclined surface, and the biasing force is boosted. The attaching force is applied to the engaging member via the transmitter. (13) The engaged portion includes a radially outwardly facing outward flange formed at a tip portion of the first member, and the outwardly facing flange is formed with an axial notch that axially penetrates, An engagement member is axially movably fitted to the second member, the engagement portion includes an inward projection that is radially inward, and the movable member is provided outside the engagement member. 13. The tool holding device according to the twelfth aspect, wherein the second inclined surface is fitted so as to be movable in a direction, and the second inclined surface is formed on a projection outward in the radial direction formed on the second member. In the device of this aspect, when the second member is attached to the first member, the movable member is moved against the urging force of the urging means, and the inward projection of the engaging member and the shaft of the outward flange. The first member and the second member are made to approach each other in the axial direction so that the phase of the direction notch coincides with each other, and after the inward projection passes through the axial notch, both are relatively rotated to move the inward projection out. Move to a position where it can be engaged with the facing flange. At this time, since the movable member is moved against the urging force of the urging means, the inward projection and the outward flange do not engage with each other, and the relative rotation can be easily performed. When the force applied to the member is released, the movable member is urged by the urging means, the first inclined surface moves the transmitter to engage the second inclined surface, and the engaging member receives an attractive force. While being applied, the inward projection and the outward flange are engaged with each other, and the first and second contact surfaces are maintained in the contact state. As in the tool holding device described later in the embodiment of the invention, the first engaging notch may also serve as the axial notch to simplify the configuration of the tool holding device, or the first engaging notch. The notch and the axial notch may be provided separately. (14) The movable member has an axial protrusion that extends in the axial direction, and a fitting notch in which the axial protrusion can be fitted is formed at a position that is out of phase with the axial notch of the first member. Tool holder according to item 13 of the present invention. In the device of this aspect, when the second member is attached to the first member, the first member and the second member are axially brought close to each other in a state where the phases of the inward projection and the axial notch are matched.
At this time, the axial projection of the movable member is located at the position out of the fitting notch in the rotation direction, the movable member cannot move to the first member side, and the movable member resists the biasing force of the biasing means. It is moved relative to the two members. Therefore, after the inward projection is passed through the axial cutout, the first member and the second member can be easily rotated relative to each other, and the relative rotation allows the axial projection and the fitting cutout to rotate in the rotational direction. If the phases match, the movable member is biased by the biasing means and fits into the fitting notch, the first inclined surface engages with the transmitter and the second inclined surface, and is pulled by the engaging member. Attaching power is given. According to this device, when the first member and the second member are made to approach each other in the axial direction, the state in which the movable member resists the biasing force of the biasing means due to the contact between the axial projection and the first member is obtained. Therefore, it is not necessary for the worker to move the movable member against the urging force of the urging means, and the second member can be attached to the first member with one hand. (15) The tool holding device according to item 13, wherein the radially outwardly-projecting projection on which the second inclined surface is formed is constituted by a radially outwardly-projecting flange. (16) While the relative rotation limiting member is held by the second member, a relative rotation limiting device that prevents relative rotation of the movable member and the relative rotation limiting member exceeding a limited angle is provided. Item 16. The tool holding device according to item 15. (17) The relative rotation limiting device has a longitudinal shape, and at least one guide portion provided in one of the relative rotation limiting member and the movable member in parallel to the axial direction, and provided in the other, 17. The tool holding device according to the sixteenth aspect, including a guided portion that is engaged with the guide portion so as to be relatively movable in the axial direction. The guide portion may be a guide pin having a circular cross section, a ridge or a recess provided integrally with or separately from one of the relative rotation limiting member and the movable member, and the guided portion is fitted with the guide pin. It may be a pin hole or a short recess or protrusion fitted with a protrusion or a recess having a long shape. In this device, between the guide part and the guided part,
Since it is necessary to engage both of them so as to be relatively movable in the axial direction, it is unavoidable that a minute clearance in the rotational direction occurs.
However, there is no inconvenience in rotating the movable member and the relative rotation limiting member together when the second member is attached to the first member. (18) The relative rotation limiting device has a longitudinal shape, a guide portion provided parallel to the axial direction on one of the relative rotation limiting member and the movable member, and a portion having the axis as a center line on the other side. The engaging piece is formed in an annular shape and includes a partial annular groove capable of accommodating the guide portion so as to be relatively movable in the circumferential direction, and when the second member is attached to the first member, the engaging piece is At the moment of engaging the first engaging notch, the axial projection of the movable member is not yet fitted in the fitting notch of the first member, and from that state, the movable member becomes the relative rotation limiting member. The tool holding device according to item 16, wherein the axial projection is allowed to rotate relative to the first member and the second member until they are fitted in the fitting notches. In the apparatus of this aspect, when the second member is attached to the first member, the second member is rotated with respect to the first member after the inward projection is passed through the axial cutout. At the beginning of rotation, only the second member rotates, the movable member does not rotate, and if the guide portion engages with the end of the partial annular groove, the movable member is rotated together. Since the movable member is rotated later, the rotation of the second member causes the engagement piece and the first engagement notch to be in phase with each other, so that the engagement piece engages with the first engagement notch. At that moment, the axial projection of the movable member does not fit into the fitting notch of the first member, and the engaging force is not applied to the engaging member. After the engaging piece is engaged with the first engaging notch, the movable member is relatively rotated with respect to the second member and the relative rotation limiting member, and the phases of the axial projection and the fitting notch are matched. For example, the movable member is allowed to move by the urging force of the urging means by the fitting of the axial projection into the fitting notch, and the engaging force is applied to the engaging member. At this time, since the engaging piece has already been engaged with the first engaging notch, the engaging force is applied to the engaging member before the engaging piece is fitted into the first engaging notch, and the first member It is possible to prevent the relative rotation between the first member and the second member from being hindered and the engagement piece from being completely disengaged from the first engagement notch. (19) The tool holding device according to item 17 or 18, wherein the guide portion includes a guide pin having a circular cross section.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments common to the first and second inventions will be described below in detail with reference to the drawings. In FIG. 1, 10 is a sleeve which is a first member. Sleeve 10
Is provided with a flange portion 12 that faces outward in the radial direction. Further, the sleeve 10 has a tip portion (the left end portion in FIG. 1).
To the base end (right end in FIG. 1) from which a bottomed fitting hole 18 that opens to the end face 16 is formed.

On the other hand, on the end face 22 side of the flange portion 12,
A mounting portion 24 is formed. The mounting portion 24 has a taper outer peripheral surface 26 having a smaller diameter as the distance from the flange portion 12 increases.
have. An axial hole 30 is formed in the end surface 28 of the mounting portion 24. A portion of the axial hole 30 on the end surface 28 side is formed as a female screw portion 32 so that a male screw portion of a pull stud (not shown) can be screwed. Further, the flange portion 12 is formed with a notch 34 so that the flange portion 12 can be engaged with an engaging projection portion on the machine tool side.

Although not shown in the drawings, the spindle hole of the machine tool has a tapered inner peripheral surface corresponding to the tapered outer peripheral surface 26 of the mounting portion 24, and the mounting portion 24 of the sleeve 10 has a notch and a notch. When the pull stud is gripped by the gripping member in the spindle hole and pulled into the spindle hole, the engaging projection is engaged with the notch 34 of the flange portion 12. The taper outer peripheral surface 2 of the mounting portion 24
6 and the taper inner peripheral surface of the spindle hole are tightly fitted to each other, so that the sleeve 10 is attached to the spindle of the machine tool so as to be relatively immovable and non-rotatable in the axial direction.

A drill holder 36 as a tool holder, which is a second member, is detachably fitted into the fitting hole 18 of the sleeve 10. The drill holder 36 includes a fitting shaft portion 38 and a tool holding portion 42 that holds a drill 40 (shown by a chain double-dashed line in FIG. 1) as a processing tool at its tip portion (left end portion in FIG. 1). The fitting hole 18 of the sleeve 10 from the rear end side (right end side in FIG. 1) of the coupling shaft portion 38.
It is designed to fit into.

The holder body 44 of the drill holder 36 has a generally cylindrical shape, and has a tool insertion hole 46 extending in the axial direction.
have. A female screw hole 48 is formed in the center of the tool insertion hole 46 in the axial direction, and an adjusting member 50 as a screw member is screwed into the inside. A hexagonal hole 51 is formed at the rear end of the tool insertion hole 46 of the adjusting member 50, and a tool such as a hexagonal spanner is inserted from the rear end of the tool inserting hole 46 to adjust the member 50. By rotating the, the adjusting member 50 can be moved in the axial direction.

A driver 52, which is a tool driving member, is fitted in the female screw hole 48 so as to be movable in the axial direction. The driver 52 is brought into contact with the adjusting member 50 at the end face 54, and is provided with a tool engaging groove 56 on the end face opposite to the end face 54 so as to engage with the tongue of the drill 40 in a non-rotatable manner and in the axial direction. Are abutted against each other.

On the outer peripheral surface of the driver 52, a pair of axial grooves having a substantially semicircular cross-section (only one of which is shown in FIG. 5) is formed, and a pair of columnar member pins are formed in the axial grooves. 62 (only one is shown in FIG. 5) is fitted. In a state where each pin 62 is fitted in the driver 52, almost half of the pin 62 is projected outward in the radial direction from the outer peripheral surface of the driver 52. On the other hand, a pair of guide grooves 64 extending in the axial direction and having a substantially semicircular cross-sectional shape are formed on the inner peripheral surface of the female screw hole 48, and the protrusions of the pins 62 are engaged with the guide grooves 64, respectively. By being combined, the driver 52 is guided in the axial direction. Further, the pair of pins 62 function as rotation preventing protrusions that prevent the driver 52 from rotating in the female screw hole 48.

Therefore, the rotational torque applied to the holder body 44 is transmitted to the drill 40 via the pin 62 and the driver 52. The axial position of the drill 40 is adjusted by changing the position of the adjusting member 50. By changing the position of the driver 52 by moving the adjusting member 50, the protruding length of the drill 40 from the holder main body 44 can be changed.

Further, the adjusting member 50 and the driver 52 are formed with through holes 66 and 68 penetrating in the axial direction, respectively.
A cutting fluid passage for keeping the space inside the holder body on both sides of 2 in communication with each other is formed. Although not shown, the drill 40 is also provided with a liquid passage that penetrates in the axial direction. Therefore, in the state where the driver 52 and the drill 40 are engaged with each other, the through holes 66 and 68 maintain communication with the liquid passage of the drill 40, and the cutting fluid supplied to the holder body 44 is adjusted. And driver 52
It passes through the inside and flows into the liquid passage of the drill 40.

A front end portion of the tool insertion hole 46 in the axial direction is a tapered hole 70, and a collet 72 is fitted therein.
The collet 72 is a generally cylindrical member having a plurality of axial slits alternately formed from both end surfaces and having a length that does not reach the opposite end surface. It is possible to reduce the diameter. The diameter of the taper hole 70 is increased toward the tip end side, and the collet 72 is fitted into the taper hole 70 at the taper outer peripheral surface 74 formed corresponding to the inner peripheral surface of the taper hole 70, while being axially arranged. The inner peripheral surface 76 formed in parallel is in close contact with the outer peripheral surface of the shank portion of the drill 40 to grip it, and receives the axial force received by the drill 40 during cutting.
An annular groove 80 having a rectangular cross section is further formed on the outer peripheral surface of the collet 72 adjacent to the portion where the tapered outer peripheral surface 74 is formed, and the tapered outer peripheral surface 74 is sandwiched by the annular groove 80.
On the outer peripheral surface on the side opposite to the portion where the is formed, a tapered surface 82 having a smaller diameter on the tip side is formed.

The tip of the collet 72 is covered with a collet cap 84. An annular projection 86 that can be fitted into the annular groove 80 and a tapered surface 88 that corresponds to the tapered surface 82 of the collet 72 are formed on the inner peripheral surface of the collet cap 84. The annular projection 86 of the cap 84 is aligned with the annular groove 8 of the collet 72.
If the collet 72 is returned to the natural state after the collet 72 is fitted into the collet 0, the collet cap 84 is covered on the collet 72 in a state of being immovable in the axial direction. In this state, the tapered surface 8
8 is in close contact with the taper surface 82, and the collet cap 84 is attached to the collet 72 so as not to be relatively movable and relatively rotatable.

The thickness of the annular protrusion 86 is slightly smaller than the width of the annular groove 80.
Within 0, the collet 72 can move a certain distance in the axial direction. Further, between the collet cap 84 and the tip surface 92 of the holder main body 44, a gap having a size that allows the collet cap 84 and the collet 72 to move in the axial direction is provided.

A male screw portion 98 is formed on the outer peripheral surface of the tip portion of the holder body 44. The male screw portion 98 has a clamp nut 10 which is a screw member as a rotation operating member.
0 is screwed coaxially with the holder body 44. The clamp nut 100 is fitted into the collet cap 84 at a portion protruding from the holder body 44, and the clamp nut 100 and the collet cap 84 are rotatable relative to each other by a large number of balls 102 interposed therebetween. It is said to be axially immovable. An annular groove having a semicircular cross section is formed in each portion of the inner peripheral surface of the clamp nut 100 and the outer peripheral surface of the collet cap 84, which correspond to each other, and an annular space having a circular cross section formed by the annular grooves, A large number of balls 10 are formed from radial through holes (not shown) formed in the clamp nut 100.
After 2 is supplied, the through hole is closed by the plug.

Accordingly, when the clamp nut 100 is rotated in the direction in which it is tightened in the male screw portion 98, the collet cap 84 is moved toward the holder body 44, and the taper surface 88 of the collet cap 84 causes the collet cap 84 to collet. The tapered surface 82 of 72 is pushed, the collet 72 is pushed into the tapered hole 70, and the diameter is elastically reduced. As a result, the shank portion of the drill 40 is gripped by the inner circumferential surface 76 of the collet 72, and in the gripped state, the relative rotation of the collet 72 with respect to the holder body 44 is prevented by the frictional force.

Reference numeral 104 denotes a tool engaging groove for engaging a tightening tool that rotates the clamp nut 100, and a plurality of tool engaging grooves 104 are formed on the outer peripheral surface of the clamp nut 100 at equal angular intervals (6 in this embodiment). 1 in FIG. 1
(Only shown). Further, the slit grooves formed from both end surfaces of the collet 72 are finished in the tapered holes 70, respectively, and therefore the collet 72 can maintain liquid tightness between the holder body 44 and the drill 40. ing.

As shown in FIG. 4, a flange portion 110 extending outward in the radial direction is formed at a portion of the holder main body 44 which is an end portion protruding from the sleeve 10. On the outer peripheral surface of the end portion on the tip side (the side on which the tool holding portion 42 is provided) of the holder body 44 in the axial direction of the flange portion 110, a tapered surface 112 that is inclined toward the tip side toward the axis of the holder body 44. Are formed. The taper surface 112 has an inclination angle of about 60 degrees. As shown in FIG. 5, the flange portion 110 is formed with two constant-width notches 114, which are axially penetrating and second engaging notches each having a constant width, at two locations separated in the diametrical direction.

As shown in FIGS. 1 and 2, a collar 120, which is a relative rotation limiting member, is fitted on the tip side of the flange portion 110 of the holder main body 44 so as to be relatively movable in the axial direction. As shown in FIGS. 6 to 9, the collar 120 is provided so as to project from a cylindrical fitting portion 122 and two positions diametrically separated from each other on the end surface on one side in the axial direction of the fitting portion 122. And an engaging piece 124. Engagement piece 12
In the base end portion of 4, the two side surfaces extending in the axial direction are both parallel to the axial direction, and the width is a constant width engaging portion 126, and the protruding end portion following the constant width engaging portion 126 is One of the two side surfaces extending in the axial direction is a parallel surface 128 parallel to the axial direction, and the other is the parallel surface 12 from the base end side toward the protruding end side.
The tilted engaging portion 132 is a tilted surface 130 that tilts toward 8 and has a tilt angle of 15 degrees with respect to the axial direction. Each one of the two engaging pieces 124 has an inclined engaging portion 1
32 is formed in such a direction as to prevent relative rotation between the forward direction and the reverse direction based on the cutting resistance between the sleeve 10 and the drill holder 36 in the parallel plane 128.

Each of the engaging pieces 124 is fitted in a constant width notch 114 formed in the flange portion 110 so as to be relatively movable in the axial direction. As shown in FIG. 2, the collar 120 is engaged with the engaging piece 124 by a compression coil spring 136 as an elastic member which is a kind of biasing means arranged between the spring retainer 134 attached to the holder body 44. Fits into the constant width notch 114, and the rear end portion of the holder main body 44 in the axial direction of the flange portion 110, that is, the end surface 208 on the fitting shaft portion 38 side (see FIG. 2).
It is biased in the direction to project from. The engagement piece 124 is
The compression coil spring 136 moves from a non-acting position where it is disengaged from a first engaging notch formed in the sleeve 10 to be described later to an operating position side where the constant width notch 114 and the first engaging notch are crossed and engaged. It is urged to do so. The clearance between the constant width engaging portion 126 and the constant width notch 114 in the rotational direction is 0.01 mm.
It is set to ~ 0.03 mm.

The fitting portion 122 of the collar 120 has a stepped shape having a large diameter fitting portion 138 and a small diameter fitting portion 140. The large-diameter fitting portion 138 is provided on the side of the fitting portion 120 opposite to the side on which the engagement piece 124 is provided so as to project.
As shown in FIG. 6, FIG. 8 and FIG. 9, the two diametrically separated portions are opened at the end face of the large diameter fitting portion 138 and extend in the axial direction to reach the small diameter fitting portion 140. Two pin holes 142 each having a circular cross section are formed. These two
Each of the pin holes 142 is, as shown in FIG.
With respect to the position at which the engaging piece 124 is formed, the positions are separated by 17.5 degrees in both the forward and reverse directions, and are formed at positions separated by 35 degrees from each other. , Pins 144 (see FIG. 2) are fitted. The portion of the pin hole 142 formed in the small-diameter fitting portion 140 has a substantially semicircular cross section, and the pin 144
In the portion fitted to the small diameter fitting portion 140, approximately half in the radial direction is projected outward from the pin hole 142 in the radial direction.

An engaging member 150 is fitted on the outside of the collar 120 as shown in FIG. Engaging member 15
As shown in FIGS. 10 to 13, 0 is the rear end, that is, the end surface on the side of the engaging shaft portion 38, of the cylindrical end portion 152 and the two end surfaces that are separated in the axial direction of the fitting portion 152. It has two inward projections 154 that are provided in a protruding manner. The inward protrusions 154 are separated from each other in the diameter direction of the end surface of the fitting portion 152.
Each of the points is provided so as to extend radially inward.

An intermediate portion in the axial direction of the fitting portion 152 of the engaging member 150 is located at a position having the same phase around the axis with respect to the two inward projections 154 and is diametrically separated. Slotted holes 156 extending in the axial direction are provided at the two locations, respectively.
Are formed. Flange portion 1 of the holder body 44
As shown in FIG. 5, there are two pins 10 extending in the radial direction at positions separated by 10 in the diametrical direction and at positions 90 degrees out of phase with the positions where the two constant width notches 114 are formed. A hole 157 is formed, and a pin 158 is fitted in each pin hole 157, and a protruding end portion of the pin 158 from the pin hole 157 is fitted in an elongated hole 156 of the engaging member 150. As a result, the engagement member 150 is not relatively rotatable with respect to the holder body 44 and is allowed to make a slight relative movement in the axial direction, and the inward projection 154 has the collar 120.
Are attached in a phase different from the engaging piece 124 of 90 degrees in phase. Further, when the engagement piece 124 is fitted in the constant width notch 114 of the flange portion 110, the collar 120 and the engagement member 150 cannot rotate relative to each other.

At the tip end side (the tool holding portion 42 side) of the portion of the fitting portion 152 engaged with the flange portion 110, the inner diameter is made smaller than the outer diameter of the flange portion 110, and the outer peripheral surface is The tapered outer peripheral surface 160 has a diameter that gradually decreases toward the tip. The inclination angle of the tapered outer peripheral surface 160 with respect to the axis of the engaging member 150 is about 10 degrees. The outer peripheral surface is a diametrically separated portion of the tapered portion 162, which is a tapered surface, and the diametrically penetrating holes 164 are formed at the two locations that are in phase with the inward projection 154 in the rotational direction. Is formed, and a steel ball 166 (see FIG. 2) as a sphere which is a kind of a transmitter is fitted. Since the steel ball 166 is positioned closer to the tip side than the flange portion 110, the inner peripheral surface of the portion of the tapered portion 162 where the through hole 164 is formed is a tapered inner peripheral surface 168 whose diameter gradually decreases toward the tip. , Taper 16
2 and the flange 110 is prevented from interfering,
The steel ball 166 projects from the through hole 164 and the flange portion 11
0 can be engaged.

Further, as shown in FIG. 13, two notches 169 are formed in the end face of the taper portion 162 and extend in the axial direction at two locations that are 90 degrees out of phase with the two inward projections 154. Has been done. Each of these notches 169 has a partial annular shape centered on the axis of the engaging member 150, and is in phase with the two engaging pieces 124 provided on the collar 120 in the rotational direction.

A movable sleeve 170 is fitted to the outside of the engaging member 150 as shown in FIG. The movable sleeve 170 has a cylindrical shape as shown in FIGS. 14 and 15, and of the two end faces separated in the axial direction, the end face on the fitting shaft portion 38 side of the drill holder 36 is separated in the diametrical direction. Axial projections 1 extending in the axial direction are provided at the respective points.
72 is projected. In addition, a tapered inner peripheral surface 174 having an inclination corresponding to the inclination of the tapered outer peripheral surface 160 formed on the engaging member 150 is formed on the inner peripheral surface of the movable sleeve 170. Further, an annular protrusion 176 protruding inward in the radial direction is formed on the tip side of the portion of the movable sleeve 170 on which the tapered inner peripheral surface 174 is formed, and two shafts of the annular protrusion 176 are formed. Partial ring-shaped engagement grooves 178 having a central angle of 35 degrees with respect to the axis of the movable sleeve 170 are formed at two locations where the phase in the rotational direction is different from the direction projection 172 by 90 degrees. . These engaging grooves 178 are respectively provided in the collar 12
The portions of the two pins 144 fitted to 0 are projected to the small diameter fitting portion 140 side, and the movable sleeve 170
Pin 1 to collar 120 and drill holder 36
The range in which 44 moves in the engagement groove 178 (here, 35
Relative rotation is possible.

As shown in FIG. 2, the movable sleeve 170 has a tapered inner peripheral surface 174 engaged by a compression coil spring 182 as an elastic member which is a kind of biasing means arranged between the movable sleeve 170 and the spring retainer 180. Composite material 150
Is urged in a direction to engage with the steel ball 166 held by. Therefore, in the state where the drill holder 36 is removed from the sleeve 10, the engaging piece 124 of the collar 120 is fitted into the constant width notch 114 formed in the flange portion 110 by the urging force of the compression coil spring 136, and The inclined engagement portion 132 is projected from the flange portion 110 toward the fitting shaft portion 38. Further, in the movable sleeve 170, the inner peripheral surface 174 of the taper is engaged with the steel ball 166 by the urging force of the compression coil spring 182, and the steel ball 1
66 is engaged with the tapered surface 112 formed on the flange portion 110. The movement limit of the collar 120 in the biasing direction of the compression coil spring 136 is defined by the large-diameter fitting portion 138 contacting the annular projection 176 of the movable sleeve 170.

As shown in FIGS. 16 and 17, an annular fitting groove 190 that opens to the outer peripheral surface is formed at the tip of the sleeve 10, whereby the outward flange 196 is formed at the tip of the sleeve 10. Are formed. The diameter of the outward flange 196 is smaller than that of the sleeve 10 on the rear end side of the fitting groove 190, and the annular groove side surface that defines the outward flange 190 of the fitting groove 190 is larger than the other groove side surface. The diameter of the engaging member 15 is small, as will be described later.
The engaging surface 192 with which the inward protrusion 154 of No. 0 engages is configured. Further, the other groove side surface, as described later,
A stopper surface 194 for stopping the movement of the movable sleeve 170 is formed, and is projected outward in the radial direction from the engagement surface 192. The sleeve 10 is also formed with two axially extending fitting notches 198 which are open in the stopper surface 194 and the outer peripheral surface of the sleeve 10 and are spaced apart in the diametrical direction.

Outward flange 1 at the tip of the sleeve 10
In the portion including 96, the above two fitting notches 198 are 9
First inclined notches 200 that are first engaging notches are formed at two places where the phases are different by 0 degrees. One inclined notch 20
Reference numeral 0 denotes the tip end surface of the sleeve 10, and the outward flange 1
As shown in FIG. 3, one of the two side surfaces of the sleeve 10 extending in the axial direction is a parallel surface 204 parallel to the axial direction and the other is the sleeve 10. The rear end side, that is, the engaging piece 1
24 is inclined in a direction approaching the parallel surface 204 as it goes from the non-acting position side separated from the one-sided notch 200 to the acting position side that engages across the constant width notch 114 and the one-sided notch 200. The inclined surface 206 has an inclination angle of 15 degrees with respect to the axial direction. These two one-sided bevel notches 200 are formed in directions opposite to each other with respect to the rotation direction, and the parallel surfaces 204 of each one-side bevel notch 200 are relative to the forward and reverse directions of the sleeve 10 and the drill holder 36, respectively. Each of the rotation is caused by the two engagement pieces 12
4 and abutting against the parallel surface 128 of each one-sided slant engagement portion 132 to prevent the same. Also, two engaging pieces 124 and one inclined cutout 2 are provided.
00, the one-sloping engaging portion 132 has the one-sloping notch 20.
In the state of being engaged with 0 in the rotation direction without a gap,
The collar 120 is sized to prevent further movement of the collar 120 toward the sleeve 10 and keep the large-diameter fitting portion 138 of the collar 120 away from the annular projection 176 of the movable sleeve 170.

The attachment of the drill holder 36 of the tool holding device configured as described above to the sleeve 10 will be described.
The drill 40 is held in the drill holder 36 prior to attachment to the sleeve 10. First, the shank of the drill 40 is inserted into the tool insertion hole 46, and the tongue is engaged with the tool engagement groove 56 of the driver 52. Then, the tool is engaged with the hexagonal hole 51 of the adjusting member 50 and rotated, and the driver 52 is moved in the axial direction by an arbitrary amount to drill 4.
Adjust the depth of 0 into the tool insertion hole 46. When the appropriate insertion depth of the drill 40 is determined, the tool is engaged with the tool engagement groove 104 of the clamp nut 100 and rotated, and the collet 72 is tightened via the collet cap 84, so that the collet 72 is tapered. The diameter of the drill 40 is reduced while being pushed in, and the drill 40 is clamped and held by the collet 72.

Subsequently, the drill holder 36 is attached to the sleeve 10.
Attach to The sleeve 10 is for a machining device with an automatic tool changer, is removed from the spindle except during machining, and is accommodated while being supported by a supporting member in an accommodation device (not shown). The drill holder 36 is accommodated in the accommodation device. Is attached to the sleeve 10 housed in. The engaging projection 124 of the collar 120, the inward projection 154 of the engaging member 150, and the movable sleeve 17 at the start of mounting.
0 axial protrusion 172 and the fitting notch 19 of the sleeve 10.
FIG. 18 shows the positional relationship between the No. 8 and the one-sided inclined notches 200 in the rotation direction. The sleeve 10 is a collar 120.
It is shown larger than it actually is to avoid obscuring the figure due to overlap with etc.

As shown in FIG. 18A, the inward projection 1
The phases of 54 and the axial projection 172 in the rotational direction are matched. In this state, the pin 14 fitted to the collar 120
4 is in a state of being engaged with the upstream end of the engaging groove 178 of the movable sleeve 170 in the rotational operation direction (indicated by an arrow in the drawing) when the drill holder is attached. As described above, the collar 120 has two pin holes 142 formed at two diametrically spaced positions, and the pin 144 is fitted into one of the pin holes 142.
Is fitted into the pin hole 142 located on the upstream side in the rotational operation direction of the drill holder 36. When the rotation operation is started, the drill holder 36 and the movable sleeve 170 are fitted into the pin holes 142 on the side where the relative rotation is generated. Pin 1
In a state in which 44 engages with the end of the engagement groove 178 on the side that causes relative rotation when the rotation operation of the drill holder 36 is started, the axial projection 172 of the movable sleeve 170 and the engagement piece 124 are fitted together. The notches 198 and the one-sided bevel notches 200 are positioned at an angle distance equal to the angle between them.

Once the inward projection 154 and the axial projection 172 are aligned in the rotational direction, the inward projection 154 and the axial projection 172 are aligned in the rotational direction with the one-sided notch 200, and then The projecting portion 154 is provided with a one-sided cutout 200.
The fitting shaft portion 38 of the drill holder 36 is inserted into the fitting hole 18 of the sleeve 10 while passing through the inside. Since the engagement piece 124 of the collar 120 and the one-sided inclined notch 200 are out of phase with each other by 90 degrees, when the fitting shaft portion 38 is inserted into the sleeve 10, first, as shown in FIG. Engaging piece 124
Contacts the end surface 16 of the sleeve 10. When the fitting shaft portion 38 is further inserted into the sleeve 10 from this state, the drill holder 36 is advanced with respect to the collar 120 while compressing the compression coil spring 136, and the inward projection 154 passes through the one-sided inclined notch 200. And is inserted into the fitting groove 190.

Since the axial projection 172 of the movable sleeve 170 is projected from the inward projection 154 of the engaging member 150, the entire inward projection 154 passes through the one-sided cutout 200 and enters the fitting groove 190. Stopper surface 19 before entering
Contact 4 Then, the drill holder 36 is advanced while compressing the compression coil springs 136 and 182 until the entire inward protrusion 154 enters the fitting groove 190, whereby the flange holder 36 is moved to the flange as shown in FIG. The portion 110 abuts on the end surface 16 of the sleeve 10, the axial projection 172 abuts on the stopper surface 194, and the entire inward projection 154 is positioned in the fitting groove 190.
When the drill holder 36 is advanced and the engaging member 150 and the movable sleeve 170 are advanced together with the drill holder 36, the engaging pieces 124 of the engaging member 150 and the collar 120 are advanced.
The interference with the notch 169 formed in the engaging member 150.
(See FIGS. 11 and 13).

When the drill holder 36 is rotated 90 degrees in this state, the engagement piece 124 and the one-sided inclined notch 200 are in phase with each other, and the compression coil spring 1 with respect to the collar 120 is rotated.
By the urging force of 36, the engagement piece 124 is fitted into the one-sided inclined notch 200 as shown in FIG. However,
In the collar 120, the large diameter fitting portion 138 has the movable sleeve 17
Since it abuts against the annular protrusion 176 of 0 and is prevented from advancing, the engaging piece 124 remains in a state in which a part thereof is fitted in the one-sided inclined notch 200.

When the drill holder 36 is rotated 90 degrees, the pin 144 moves in the engagement groove 178 during the initial rotation of 35 degrees, and the movable sleeve 170 cannot be rotated. Therefore, in the state where the drill holder 36 is rotated 90 degrees and the engagement piece 124 is fitted into the one-sided inclined notch 200, as shown in FIG.
72 is at a position displaced from the fitting notch 198 by 35 degrees. After the engagement piece 124 is fitted into the one-sided inclined notch 200, if only the movable sleeve 170 is rotated by 35 degrees, FIG.
As shown in (c), the axial projection 172 and the fitting notch 198.
, The movable sleeve 170 is advanced by the urging force of the compression coil spring 182, and the axial projection 172 is fitted into the fitting notch 198 as shown in FIG. It should be noted that FIG. 2 shows the fitting cutout 198 and the one-sided cutout 2
00 and one of them are rotated 90 degrees and are shown in the same phase in the direction of rotation. As the movable sleeve 170 is advanced, the collar 120 is also advanced by the urging force of the compression coil spring 136, and the one-sided inclined engaging portion 132 of the engagement piece 124 is further fitted into the one-sided inclined notch 200, as shown in FIG. Thus, the parallel surface 128 and the inclined surface 130 are brought into contact with the parallel surface 204 and the inclined surface 206, respectively. Then, during processing, the sleeve 10 rotates in the parallel plane 20.
4, 128 engagement and engagement piece 124 constant width engagement portion 1
26 and the constant width notch 114 engage the drill holder 3
6 is transmitted.

When the movable sleeve 170 is advanced, the tapered inner peripheral surface 174 engages with the steel ball 166 and the steel ball 1
66 is pressed against the tapered surface 112 of the flange portion 110,
Along the tapered surface 112, the flange portion 1 in the axial direction
10 is moved inward in the radial direction while being moved in a direction away from the end surface 208 on the fitting shaft portion 38 side. As aforementioned,
The taper inner peripheral surface 174 has an inclination angle of 10 degrees and the flange portion 1
Since the inclination angle of the tapered surface 112 of No. 10 is 60 degrees, the compression coil spring 182 moves the movable sleeve 17
The force that pushes the steel ball 166 through 0 is boosted by about 8 times without considering friction, and is converted into a force in which the inward projection 154 approaches the end surface 208 and the engaging member 15
Added to 0. Therefore, the inward protrusion 154 engages with the engagement surface 192 of the outward flange 196, and strongly presses the end face 16 against the end face 208, so that the drill holder 36 is attached to the sleeve 10 without a gap in the axial direction. With this tool holding device, an attractive force of 196 N (20 kgf) can be obtained.

The limit of movement of the engaging piece 124 of the collar 120 in the direction in which the engaging piece 124 is engaged with the one-sided inclined notch 200 is the one-sided inclined engaging portion 1.
In the state where the drill holder 36 is attached to the sleeve 10 as shown in FIG.
The large diameter fitting portion 138 of the collar 120 is the movable sleeve 170.
Is separated from the annular protrusion 176. Then, the rotation of the sleeve 10 is transmitted to the drill holder 36 via the collar 120, and the drill 40 is rotated. While the engagement piece 124 is fitted in the one-sided inclined notch 200 and the inclined surface 130 is in contact with the inclined surface 206, the fitting shaft portion 38 remains in the fitting hole 18 between the drill holder 36 and the sleeve 10. When there is relative movement in the fitted direction, the collar 120 is slightly retracted against the biasing force of the compression coil spring 136, and the end face 16 and the end face 208 are allowed to come into contact with each other. The drill holder 36 and the sleeve 10 are mounted without a gap in the axial direction, and the engaging piece 124 is engaged with the one-sided bevel notch 200 at the one-sided bevel engaging portion 132 without a gap in the rotational direction.
The movement limit of the engaging piece 124 of the above to the side where the engaging piece 124 is fitted into the one-sided inclined engaging portion 132 is defined.

In this embodiment, the flange portion 110
The tapered surface 112 formed on the upper surface constitutes a second inclined surface, the tapered inner peripheral surface 174 formed on the movable sleeve 170 constitutes a first inclined surface, and these are steel balls 166 serving as transmitters.
Together with a compression coil spring 182, which constitutes a biasing means, and a movable sleeve 170, which is a movable member, together with an engaging member 150, which has an inward projection 154. The outward flange 196 and the attraction force applying device form a contact state maintaining device. In this contact state maintaining device, the end surface 16 serving as the first contact surface and the end surface 208 serving as the second contact surface, together with the sleeve 10 serving as the first member and the drill holder 36 serving as the second member.
And an axial movement prevention device that is a type of an axial movement limiting device that prevents relative movement in the axial direction exceeding a limited distance from the.

In the tool holding device of the present invention, the movable sleeve 170 and the collar 120 are rotated relative to each other, and most of the one-sided inclined engaging portion 132 of the collar 120 is fitted into the one-sided notch 200, and then the movable sleeve 170. Since the axial projection 172 of the above is fitted into the fitting notch 198 and the outward flange 196 is pressed against the flange portion 110, the one-sided inclined engaging portion 132 may fail to engage with the one-sided inclined notch 200. There is no. The collar 120 and the movable sleeve 170 are rotated integrally, and the one-sided inclined engaging portion 132
If the insertion of the axial projection 172 into the fitting cutout 198 and the fitting of the axial projection 172 into the fitting cutout 198 are performed at the same time, the axial projection 172 is inserted before the single tilt engagement portion 132 is fitted into the single tilt cutout 200. Is fitted into the fitting notch 198, the outward flange 196 is pressed against the flange portion 110 by the engaging member 150, the holder main body 44 cannot be rotated any further, and the one-sided inclined engaging portion 132 is a one-sided inclined notch. There is a risk that it will not fit into 200 and will remain in contact with end face 16. However, in the present tool holding device, the movable sleeve 170 and the collar 120 are relatively rotated, and the axial protrusion 172 is generated.
When the fitting is inserted into the fitting notch 198, the one-sided inclined engaging portion 13 has already been formed.
Since most of the two is fitted in the one-sided bevel notch 200, the one-sided bevel engaging portion 132 is guaranteed to be fitted in the one-bevel notch 200, and the drill holder 36 is securely attached to the sleeve 10. Be seen.

The drill holder 36 can be attached to the sleeve 10 by rotating the drill holder 36 in the direction opposite to the direction in which the relative rotation with the movable sleeve 170 occurs. In this case, the drill holder 36 and the movable sleeve 170 are integrally rotated by the engagement of the pin 144 and the end of the engaging groove 178, and the one-side inclined engaging portion 132 and the one-side inclined notch 200 are fitted. Fitting of the axial projection 172 into the fitting notch 198 occurs at the same time.

When the sleeve 10 to which the drill holder 36 is attached as described above is attached to the spindle of the machine tool, the attaching portion 24 of the sleeve 10 is aligned with the engaging portion on the spindle side and the notch 34 of the flange portion 12. When fitted in the spindle hole in the aligned state, the pull stud is gripped by the retracting device in the spindle hole and is pulled into the spindle hole. Thereby, the flange portion 12
The engaging portion is engaged with the notch 34, and the tapered outer peripheral surface 26 of the mounting portion 24 and the tapered inner peripheral surface of the spindle hole are tightly fitted to each other, so that the sleeve 10 cannot move relative to the spindle and cannot rotate relative to the spindle. It is attached.

When the drill holder 36 is removed from the sleeve 10, the movable coil 170 is moved in the direction away from the sleeve 10 while compressing the compression coil spring 182, and the axial projection 172 is disengaged from the fitting notch 198. At this time, as shown in FIG. 20A, the annular projection 176 of the movable sleeve 170 is in the middle of the collar 12 as shown in FIG.
2 is engaged with the large diameter fitting portion 138 of 0, and the collar 120 is retracted against the biasing force of the compression coil spring 136.
As shown in 0 (b), the engagement piece 124 has the one-sided inclined notch 20.
You can get away from 0.

When the movable sleeve 170 is rotated in this state, the end of the engaging groove 178 is engaged with the pin 144, the collar 120 is rotated, and the holder body 44 and the engaging member 150 are rotated. When the facing protrusion 154 and the one-sided inclined notch 200 are in phase with each other, the drill holder 36
Is pushed out of the sleeve 10 by the urging force of the compression coil springs 136 and 182. Movable sleeve 17
The rotation operation direction of 0 may be the same as or opposite to the rotation direction at the time of mounting. If they are the same, when the movable sleeve 170 is rotated, the end of the engagement groove 178 is engaged with the pin 144, and if the movable sleeve 170 is rotated 90 degrees, the inward protrusion 154 and the one-sided cutout 200 are formed. The phases of are in agreement. On the contrary, when the movable sleeve 170 is rotated, only the movable sleeve 170 is initially rotated, and if the movable sleeve 170 is rotated 35 degrees, the engaging groove 178 is rotated.
The end of is engaged with the pin 144, and further rotated by 90 degrees from that state, so that the phase of the inward projection 154 and the one-sided inclined notch 200 coincide. In this way, the drill holder 36
Is attached to the sleeve 10 by fitting the fitting shaft portion 38 of the drill holder 36 into the fitting hole 18 and rotating the drill holder 36 and the movable sleeve 170. To remove the movable holder 170, the movable sleeve 170 is removed. Axial protrusion 17
It is performed by moving the 2 in a direction to separate from the fitting notch 198 and rotating the same, which can be easily performed by an operator with one hand.

According to the tool holding apparatus of this embodiment, the one-sided inclined engaging portion 132 of the engaging piece 124 is formed into the one-sided inclined notch 2 during machining.
It has been confirmed by an experiment that the drill holder 36 does not come out of 00 and is not rotatable relative to the sleeve 10. In this experiment, a relative rotation limiting member having an engagement piece similar to the engagement piece 124 (however, there is no engagement piece for preventing the relative rotation in the opposite direction on the parallel surface 128, which is referred to as an embodiment of the present invention). ), A tool holding device that limits relative rotation between a sleeve that is rotated by a main shaft and a tool holder that holds a tool is provided. A tool holding device for limiting the relative rotation of the sleeve and the tool holder by a rotation limiting member (referred to as a conventional product), and the formation positions of the inclined surfaces of the one-sided inclined engaging portion and the one-sided inclined notch are opposite to those described above. An experiment was conducted under the same conditions for a tool holding device that limits relative rotation between the sleeve and the tool holder by means of a relative rotation limiting member (referred to as a reverse tilt product). For the engagement piece and the engagement notch of which the width is constant in the conventional product, the clearances on both sides in the rotation direction were set to 0.1 mm to 0.3 mm. Further, with regard to the constant width engaging portion of the engaging piece of the product of the present invention and the reverse inclination product, and the constant width notch into which the constant width engaging portion is fitted,
Clearance on both sides in the direction of rotation is 0.01 mm to 0.03 mm
And Further, a tool holding device having a conventional product is configured similarly to the tool holding device described in Japanese Utility Model Publication No. 5-46802, and a tool holding device having the product of the present invention and a tool holding device having a reverse tilt product are Each of the engaging pieces of the relative rotation limiting member serves as a one-sided inclined engaging portion, the sleeve has a one-sided inclined notch, and the one-sided inclined engaging portion and the one-side inclined notch are engaged without a gap in the rotation direction. A sleeve is configured to hold the tool holder in the same manner as the tool holding device described in the above publication except that they are combined.

The tool model has a rod-like shape with a circular cross section, and the tool model is held in a tool holding device for 200 seconds.
A load was applied by the load applying member while rotating at 0 rpm. The load applying member also has a circular rod shape in cross section, and is arranged at a right angle to the tool model, and the tip surface of it is the protruding length of the outer peripheral surface of the tool model from the tip surface of the tool holding part. Is 80 mm, and the distance from the engaging position of the one-sided bevel engaging part and the one-side bevel notch is 108 mm is 1177 N (120 kgf
), Which causes the tool model to have a radial force of 1177N and a circumferential direction whose magnitude at right angles to this radial force is the product of the radial force and the friction coefficient. Will be added. As a result, in the case of the reverse tilted product, the engaging piece came out of the engagement notch immediately after the start of the experiment, and in the conventional product, it came out after 0.2 m (minutes), whereas in the invention-implemented product, 60 m (minutes).
The experiment was terminated because it did not come out even after the lapse of time.

A load in the radial direction may be applied to the working tool during the actual working. For example, boring tools are naturally subject to radial loads, and even drills are deflected by slippage when the surface to be drilled is inclined to the center of rotation of the drill. , Lateral loads may be applied. Even in such a case, if the engaging piece has the one-sided inclined engaging portion according to the present invention, the engaging piece does not come out of the engaging notch and cannot be processed.

It should be noted that if the one-sided slant engagement portions 132 of the two engagement pieces 124 are both the sleeve 10 and the drill holder 36.
If it is formed in a direction that prevents relative rotation in the forward direction with respect to the drill holder 36, when a rotational torque in the opposite direction to that during processing is applied to the drill holder 36, for example, the drill holder 36 holds the drill 40 and penetrates. At the moment when the drill 40 moves out of the through hole when processing the hole, a rotational torque in the opposite direction acts on the drill holder 36, and due to the effect of the slope, the one-sided inclined engaging portion 132 of the engaging piece 124 becomes one. Although it may be pushed out from the inclined notch 200, in the present embodiment, the one-sided inclined engaging portions 132 of the two engaging pieces 124 are opposite to the forward direction of the sleeve 10 and the drill holder 36, respectively, as described above. Since it is formed in such a direction as to prevent relative rotation with respect to the direction, even if a rotational torque in the opposite direction to that during processing is applied to the drill holder 36, the rotational torque is received by the parallel surfaces, and the one-sided inclined engaging portion 1 2 is the will not be pushed out of single sloping notch 200.

Further, a slight clearance is provided between the constant width engaging portion 126 and the constant width notch 114,
Since the engagement piece 124 engages with the one-angled notch 200 in the one-angled engagement portion 132 without a gap, the clearance in the rotational direction between the drill holder 36 and the sleeve 10 is small as a whole, and each part of the tool holding device is small. Repeatedly collided,
It is possible to suppress the occurrence of a situation in which the tool holding device slides and is worn or settled to shorten the life of the tool holding device. In particular, the engagement piece 1
Reference numeral 24 denotes a one-sided slant engagement portion 13 having a protruding end portion from the fitting portion 122.
2, the operator can easily remove the one-sided inclined engaging portion 132 from the one-sided inclined notch 200, and
There is an advantage that the engagement piece 124 can be easily processed. For example,
As shown in FIG. 21, the flange portion 22 of the drill holder
0, the first and second engaging notches respectively formed in the portion of the sleeve including the outward flange 222 are first and second inclined inclination notches 224, 226, and the engaging piece 2 provided on the collar
It is also possible that 28 is a one-sided inclined engaging portion 230 corresponding to the first and second one-sided inclined notches 224 and 226. The first and second piece inclined cutouts 224, 226 are in a state where one of the parallel surfaces 232, 234 of the two side surfaces is located on the same plane, and the other inclined surfaces 236, 238 are also located on the same plane. The parallel surfaces 232, 234, and the inclined surface 23
6 and 238 are co-machined so as to be dimensioned such that the one-sided inclined engaging portion 230 is fitted without a gap, the one-sided inclined engaging portion 23
It is possible to allow either one of the two parts engaged with the first and second inclined cutouts 224, 226 of No. 0 to engage with each other without a gap, and the other to engage with an extremely small clearance. . However, when the rotational torque is transmitted from the sleeve to the drill holder, the first and second inclined cutouts 2 are formed in the engagement piece 228 by the action of the inclined surfaces of the inclined surfaces 236 and 238.
A force in the direction of coming out of 24, 226 acts. The inclination angles of the inclined surfaces 236 and 238 are set to the engagement piece 228 and the inclined surface 23.
6 and 238, the engaging piece 228 is significantly smaller than the friction angle (it is not enough to make the friction angle smaller than the friction angle because the friction coefficient apparently decreases due to vibration).
Of the engaging piece 228 and the one-sided cutouts 224, 22 can be prevented.
Since one of 6 and 6 is tightly fitted, it becomes difficult to pull out the engagement piece 228 from the one-sided cutouts 224 and 226 when the drill holder is detached from the sleeve. Further, if the inclination angle is larger than the friction angle, the engaging piece 228
It is easy to pull out one of the sloping notches 224, 226, but when the rotating torque is applied, the engaging piece 2
In order to prevent 28 from being pushed out from the one-sided cutouts 224, 226, it is necessary to increase the biasing force of the biasing means such as the compression coil spring. Therefore, at the time of detaching the drill holder, it is necessary for an operator to disengage the engaging piece 228 from the one-sided cutouts 224, 226 against a large biasing force, and eventually the disengaging operation becomes difficult.

On the other hand, as in the present embodiment,
If a part of the engaging piece 124 is the one-sided inclined engaging portion 132, the first engaging notch is the one-sided inclined notch 200 and the second engaging notch is the constant width notch 114, the sleeve 10 is added to the collar 120. Since the rotational torque to be received is received in a plane and transmitted to the drill holder 36 in a plane, the engaging piece 124 is cut into the notch 11.
4, the force for causing the compression coil spring 136 to urge the engaging piece 124 is not inclined.
00, the size may be such that it engages with 00
The inclination angle of the inclined surface 206 of is set to a magnitude close to the friction angle,
Alternatively, it can be made larger to facilitate removal. Further, as shown in FIG. 22, it is also possible to provide a one-sided inclined engaging portion 252 on the base end side of the engaging piece 250 and make the protruding end portion the constant width engaging portion 254. In this case, the second engaging notch formed in the flange portion 256 of the drill holder is the one-sided inclined notch 258, and the first engaging notch formed in the portion including the outward flange 259 of the sleeve is the constant width notch 260. To be done. With this engagement piece 250 as well, the rotational torque applied from the sleeve can be received on the plane and transmitted to the drill holder on the plane. However, it is not easy to form the one-sided inclined engaging portion 252 on the base end portion of the engaging piece 250. On the other hand, the engaging piece 124 of the present embodiment
Since the one-sided inclined engaging portion 132 is formed at the protruding end portion, the processing can be easily performed.

In the above embodiment, the inclination angles of the inclined surfaces 130 and 206 of the one-sided inclined engaging portion 132 and the one-sided inclined notch 200 with respect to the axial direction are set to 15 degrees. Not exclusively. The larger the angle of inclination of the inclined surface, the greater the force in the direction that causes the engaging piece generated by the action of the inclined surface to come out of the one-sided notch, and the one-sided inclined engaging portion easily comes out of the one-sided notch. Smaller is desirable. However, if the inclination angle is too small, it becomes difficult to disengage the one-sided inclined engaging part from the one-sided inclined notch, and if the engagement limit of the engaging piece is specified by the engagement of the inclined surfaces, the engagement limit Inaccurate position. Therefore, the lower limit of the inclination angle of the inclined surfaces of the one-sided inclined engaging portion and the one-sided notch is preferably 8 degrees or more, and particularly preferably 10 degrees or more. Further, the upper limit is preferably 30 degrees or less, and particularly preferably 20 degrees or less.

Further, the taper inner peripheral surface 17 of the engaging member 150.
The inclination angle of 4 is 10 degrees, and the tapered surface 1 of the flange portion 110
The inclination angle of 12 is set to 60 degrees so that the compression coil spring 182 doubles the force pushing the steel ball 166. It suffices to set the magnitude of the force by which 182 pushes the steel ball 166 to be boosted.

Further, in the above-described embodiment, the movable sleeve 170 and the collar 120 are rotated relative to each other, and the end faces 16 and 208 are attracted to each other after most of the one-sided inclined engaging portions 132 are fitted into the one-sided inclined notches 200. However, this is not essential, the movable sleeve 1
The 70 and the collar 120 may be integrally rotated. For example, two pin holes 14 formed in the collar 120
The pins 144 are fitted to both of the two and engage with both ends of the engaging groove 178 formed in the movable sleeve 170 to prevent relative rotation between the movable sleeve 170 and the collar 120. With this configuration, when the holder body 44 is rotated when the drill holder 36 is attached to the sleeve, the movable sleeve 170 rotates integrally with the collar 120. Thus, by rotating the movable sleeve 170 and the collar 120 integrally, when the drill holder 36 is attached to the sleeve 10, the same attachment operation can be performed regardless of whether the drill holder 36 is rotated in the forward or reverse direction. Further, when the drill holder 36 is detached from the sleeve 10, the detaching device can be similarly operated by rotating the movable sleeve 170 in either the forward or reverse direction, which is easy to attach and detach. ..

Further, when the drill holder is attached to the sleeve, it is not essential that the sleeve is supported by the supporting member in the accommodating device, and an operator holds the sleeve detached from the drill holder and the accommodating device for attachment. May be. Further, the drill holder may be attached to and detached from the sleeve attached to the spindle. When attaching the drill holder to the sleeve, the drill holder may be rotated with respect to the sleeve, the sleeve may be rotated with respect to the drill holder, or both may be rotated in opposite directions.

Further, as in the above embodiment, the movable sleeve 170 and the holder main body 44 are made rotatable relative to each other, and the one-sided inclined engaging portion 132 of the engaging piece 124 is formed into the one-sided inclined notch 2.
00, the movable sleeve 170 is advanced so that the sleeve 10 and the drill holder 36 are attracted to each other in the axial direction.
Rotation angle, that is, the engaging piece 124 is formed into the one-sided cutout 200.
It is not essential to make the rotation angle for engaging with the rotation angle of the movable sleeve 170 equal, and for example, the latter may be smaller than the former. Movable sleeve 1
The rotation angle of 70 is set to the angle obtained by subtracting the relative rotation angle between the movable sleeve and the drill holder from the rotation angle of the drill holder, plus a value smaller than the relative rotatable angle.

Another embodiment common to the first and second inventions is shown in FIGS. 23 to 36. In this embodiment, the sleeve 57
In 0, the drill holder 572 is pulled toward the sleeve 570 side. The other configurations are the same as those in the above-described embodiment, the corresponding parts are designated by the same reference numerals to show the corresponding relationship, and the description thereof will be omitted.

The holder main body 574 of the drill holder 572 is formed with a flange portion 576 extending outward in the radial direction, and a collar 578 is relatively movable in the axial direction and relatively rotatable on the tip side of the flange portion 576. It is fitted. The collar 578 has a cylindrical fitting portion 580.
And two engaging pieces 58 projecting from the end surface on the flange portion 576 side of the end surfaces of the fitting portion 580 separated from each other in the axial direction.
And 2. These engaging pieces 582 are the engaging pieces 12
24, as shown in FIG. 24, the base end has a constant width engaging portion 584 with a constant width, and the protruding end has a width inclined toward the tip,
One of the two side surfaces extending in the axial direction is a parallel surface 585 and the other is a sloping engaging portion 586 having an inclined surface 587, and the width formed by penetrating the flange portion 576 in the axial direction is constant. It is engaged with the constant width notch 588 so as to be relatively movable in the axial direction. The one-sided inclined engaging portions 586 of the two engaging pieces 582 are formed so as to prevent relative rotation between the sleeve 570 and the drill holder 572 in the forward and reverse directions, respectively. Further, the collar 578 is the holder main body 57.
A compression coil spring 592 as an elastic member, which is a kind of urging means arranged between the spring retainer 590 attached to the No. 4 and the spring retainer 590, urges the engaging piece 582 to engage with the constant width notch 588. When the drill holder 572 is detached from the sleeve 570, the engagement piece 582 causes the engagement shaft portion 596 of the flange portion 576 to move.
The end surface 594 on one side is projected to the fitting shaft 596 side.

A one-way clutch 598 is provided between the collar 578 and the holder body 574. The one-way clutch 598 has a casing and a plurality of rollers 600 that are a type of rolling element housed in the casing. The casing has a cylindrical shape and is press-fitted into the fitting hole 18,
A plurality of recesses that open to the inner peripheral surface of the casing are formed at equal angular intervals. Each of these recesses has a cam surface inclined so that the distance from the center of the casing becomes shorter from one end to the other end in the circumferential direction, whereby a wedge-shaped gap is formed. Each of the plurality of rollers 182 held by the retainer is arranged in the gap, and a part of the roller 182 is projected from the recess. The retainer is attached to the casing so as not to be relatively rotatable and relatively immovable in the axial direction. The roller 182 is held by the retainer so as to be movable in the relative rotation direction between the fitting shaft portion 596 and the fitting hole 18, and A spring, which is a kind of biasing means, biases the gap toward the smaller side. The holder body 574 is fitted in the plurality of rollers 600, and the one-way clutch 598 allows relative rotation in the direction based on the cutting resistance of the drill holder 572 with respect to the collar 578, but prevents relative rotation in the opposite direction. It is supposed to do.

At a position adjacent to the flange portion 576 of the fitting shaft portion 596 of the holder body 574, as shown in FIG. 27, the collet 604 is fitted and the disc spring 60 is fitted.
6 urges the flange portion 576 away from the flange portion 576. The collet 604 is a generally cylindrical member in which a plurality of slot grooves are alternately formed from both end surfaces in the axial direction, and the slot has a length that does not reach the end surface on the opposite side. Diameter is possible. Collet 60
The outer peripheral surface of No. 4 is a tapered outer peripheral surface 608, and the inner peripheral surface is a straight inner peripheral surface 610 parallel to the axial direction. A shallow circular groove 612 is formed in the fitting shaft portion 596, and the collet 604 is expanded in diameter and the fitting shaft portion 5 is formed.
96 is fitted from the rear part and fitted into the annular groove 612, and the drill holder 572 is fitted into the sleeve 57.
In the state of being removed from 0, it is biased by the disc spring 606 and brought into contact with the rear groove side surface far from the flange portion 576 of the annular groove 612.

As shown in FIGS. 23 and 25, the sleeve 570 has two openings diametrically separated from each other in the end surface 615 and the outer peripheral surface of the sleeve 570. Is not open 6
14 are formed. These two one-sided bevel notches 614
Each of the parallel planes 6 has
16 and an inclined surface 618, they are formed in mutually opposite directions with respect to the rotation direction. In addition, as shown in FIG. 23, a tapered inner peripheral surface 620 corresponding to the tapered outer peripheral surface 608 of the collet 604 is formed at the opening of the fitting hole 18.

As shown in FIG. 30, a female screw hole 642 is formed at the center of the bottom surface 640 of the fitting hole 18 of the sleeve 570. The female screw hole 642 communicates with the axial hole 30 formed in the mounting portion 24 as shown in FIG. An eccentric hole 644 is formed in the bottom surface 640 at a position eccentric from the center of the female screw hole 642. The eccentric hole 644 is a long hole that is long in the radial direction.

A sleeve 648, which is a tubular member, is detachably fitted to the bottom of the fitting hole 18. Sleeve 64
8 has a bottomed cylindrical shape having a bottomed hole 650 opened from the base end side of the sleeve 570 toward the tip end side.
As shown in FIG. 30, a stepped through hole 654 is formed in the center of the bottom surface of the bottomed hole 650, and a male screw member 656 is inserted therethrough. As enlargedly shown in FIG. 31, the male screw member 656 includes a large-diameter head portion 658 and a small-diameter male screw portion 660.
54 is made to penetrate and is fastened to the female screw hole 642. A hexagonal hole 662 as a tool engaging portion for engaging a rotary operation tool such as a hexagonal wrench is formed at the tip end portion of the head portion 658, and from the center portion of the hexagonal hole 662 to the tip end portion of the male screw portion 660. Liquid passage 66 penetrating
4 are formed.

On the bottom surface 670 of the sleeve 648, a pin 67 as an eccentric projection is provided at a position eccentric from the center of the bottomed hole 650.
2 is press-fitted. The pin 672 has a diameter slightly smaller than the width of the eccentric hole 644, which is an elongated hole formed in the bottom surface 640 of the fitting hole 18, and by fitting the pin 672 into the eccentric hole 644, the sleeve 648 is fitted. 570
Relative rotation with respect to is substantially prevented.

Through holes 676 are formed in the peripheral wall of the sleeve 648 at a plurality of locations (three locations in the illustrated example) at equal angular intervals. The diameter of the through hole 676 is larger than the thickness of the peripheral wall of the sleeve 648, and steel balls 678, which are spherical bodies serving as transmitters, are movably held therein.

An engaging member 680 is fitted in the bottomed hole 650 of the sleeve 648. The engagement member 680 is composed of a large diameter portion 681 held in the bottomed hole 680 and a small diameter portion extending axially from the tip surface of the large diameter portion 681 toward the opening side of the bottomed hole 680. A fitting hole 682 is formed in the center of the rear end surface of the large diameter portion 681, and the head portion 658 of the male screw member 656 is fitted therein. Large diameter part 681
Although not shown in the drawings, an elongated hole that is long in the axial direction is formed as an engaging recess on the outer peripheral surface of the sleeve 64.
By fitting a pin as a rotation preventing protrusion, which is erected on the peripheral wall of the sleeve 8, the sleeve 64 of the engaging member 680 is inserted.
Relative rotation with respect to 8 is prevented.

The sleeve 648 and the engaging member 680 are
The male screw member 656 is attached to the bottom surface 640 of the fitting hole 18 of the sleeve 570 by being screwed into the female screw hole 642. The head 658 of the male screw member 656 is brought into close contact with the shoulder surface of the through hole 654 of the sleeve 648, and the sleeve 648 is pressed against the bottom surface of the fitting hole 18, so that the sleeve 648 is immovably attached to the sleeve 570, and Through the sleeve 648, the engaging member 680 is attached to the sleeve 570 so as to be relatively movable in the axial direction and not relatively rotatable.

A bottomed hole 65 is formed on the inner peripheral surface of the sleeve 648.
A spring retainer 684 formed of a retaining ring is fitted in the vicinity of the opening end of No. 0, and a compression coil spring 686 serving as an elastic member serving as an urging means between the spring retainer 684 and the tip surface of the large diameter portion 681 of the engaging member 680. Is provided. Therefore, the engaging member 680 is always biased toward the bottom surface of the bottomed hole 650 by the spring 686, and the rear end surface of the large diameter portion 681 is positioned at the original position where it abuts the bottom surface of the bottomed hole 650. There is.

The first engaging portion 6 is provided on the small diameter portion of the engaging member 680.
88 are formed. The first engaging portion 688 is composed of a pair of engaging protrusions 689 that extend outward in the radial direction from two locations that are separated in the diameter direction of the small diameter portion. Each engaging projection 6
A chamfered portion 690 is formed on both sides of the surface of the 89 facing the large diameter portion 681. The function of the chamfer 690 will be described later. The engaging member 680 is formed with a through hole 691 extending axially from the tip of the small diameter portion to the fitting hole 682. The inner diameter of the through hole 691 is slightly larger than the outer diameter of the hexagonal hole 662 formed in the head portion 658 of the male screw member 656.

The through hole 691 also functions as a liquid passage, and the liquid passage 66 of the male screw member 656 is formed.
4 and the fitting hole 682 are allowed to flow in the cutting fluid. Reference numerals 692 and 694 denote O-rings, which are sealing members for preventing leakage of cutting fluid.

A movable sleeve 700 as a movable member is fitted on the outer peripheral surface of the sleeve 648. As shown in FIGS. 32 and 33, the movable sleeve 700 has a cylindrical shape, and includes a pair of cam protrusions 704 extending axially from the end surface 702 toward the distal end side of the sleeve 570. Each of the cam projections 704 is chamfered on both shoulders so that the front end surface has a middle height and the central portion has a cam surface 70 perpendicular to the axial direction.
6.

A flange portion 708 extending outward in the radial direction is formed on the outer peripheral surface of the end portion on the opening side of the sleeve 648, and the flange portion 708 is axially penetrated at two diametrically separated locations. An axial groove 710 is formed. The axial groove 710 is sized to allow relative movement in the axial direction of the cam projection 704, but prevent relative movement in the circumferential direction. Therefore, the pair of cam projections 704 of the movable sleeve 700 are fitted into the axial grooves 710, respectively, so that the movable sleeve 700 is moved to the sleeve 648.
On the other hand, relative movement is possible in the axial direction, but relative rotation is impossible.

A spring retainer 716 consisting of a retaining ring is fixed near the rear end of the outer peripheral surface of the sleeve 648, and biasing means is provided between the movable sleeve 700 and the end of the movable sleeve 700 opposite to the cam projection 704. A compression coil spring 720 is arranged as a barrel elastic member. Therefore, the movable sleeve 700 is closed by the spring 720.
Toward the open end of 50, i.e. sleeve 570
Although the end surface 702 of the movable sleeve 700 abuts the flange portion 708 of the sleeve 648, the movement limit of the movable sleeve 700 in the axial direction is defined.

As shown in FIG.
As shown in FIG. 5, an annular cam groove 728 is formed as the cam portion. The cam groove 728 has a first inclined surface 730 engageable with a steel ball 678 held in the through hole 676 of the sleeve 648. The first inclined surface 730 is the sleeve 64.
With respect to the axial direction of 8, the sleeve 648 is inclined toward the outer end in the radial direction toward the opening end side.

On the other hand, an annular cam groove 734 is formed as a cam portion on the outer peripheral surface of the large-diameter portion 681 of the engaging member 680, and the cam groove 734 has a second inclination capable of engaging with the steel ball 678. A surface 736 is formed. The second inclined surface 736 is also inclined with respect to the axial direction of the sleeve 648, but the inclination direction is opposite to that of the first inclined surface 730, and the inclination angle is increased. In the present embodiment, the inclination angle of the first inclined surface 730 is 15 degrees, which is smaller than 45 degrees, while the inclination angle of the second inclined surface 736 is 45 degrees.
It is a degree. The inclination angle of the second inclined surface 736 is preferably 45 degrees or more from the viewpoint of the following boosting function.

At all times, the movable sleeve 700 is urged by the spring 720 toward the movement limit position where the end surface 702 contacts the flange portion 708, and the cam groove 72.
The first inclined surface 730 of No. 8 is engaged with the steel ball 678.
As a result, the urging force of the spring 720 in the axial direction is increased by the action of the first inclined surface 730 of the cam groove 728.
Is converted into a force that urges inward in the radial direction. The urging force causes the steel ball 678 to move the second inclined surface 736 of the cam groove 734.
And is converted into an axial biasing force that biases the engaging member 680 from the distal end side to the proximal end side of the sleeve 570 by the action of the second inclined surface 736. That is, the axial biasing force of the spring 720 is converted into the axial biasing force. At the same time, the inclination angle of the first inclined surface 730 in the axial direction is smaller than the inclination angle of the second inclined surface 736 in the axial direction, so that the biasing force of the spring 720 is boosted, and the engaging member 680 does not move. An attractive force larger than the biasing force of the spring 720 is applied.

On the other hand, when the movable sleeve 700 is moved to the base end side of the sleeve 570 against the biasing force of the spring 720, the engagement between the first inclined surface 730 and the steel ball 678 is released and the steel Since the ball 678 can move toward the cam groove 728 and the engagement between the steel ball 678 and the second inclined surface 736 is released, the attracting force of the engaging member 680 is reduced only to the biasing force of the spring 686. In the present embodiment, the steel ball 678, the first inclined surface 730 and the second inclined surface 7
The force conversion device 740 is constituted by 36.

The drill holder 572 is shown in FIGS. 27 and 29.
28 shows the rear end side of the fitting shaft portion 596 and FIG. 28 shows the front end side. As shown in FIGS. 27 and 29, the drill holder 5
An axial hole 746 communicating with the tool insertion hole 46 is formed in the rear end surface 744 of the fitting shaft portion 596 of 72. The opening end of the axial hole 746 facing the sleeve 570 is a small diameter hole portion 750, and a large diameter hole portion 752 is formed at the back. As shown in FIG. 29, the rear end surface 744 is formed with a notch 754 that extends in the diameter direction and is orthogonal to the small diameter hole portion 750 of the axial hole 746. Two engaging portions 758 are formed.

The second engaging portion 758 has a phase between the first engaging portion 688 of the engaging member 680 and the cutout 754 when the engaging shaft portion 596 is fitted in the engaging hole 18 of the sleeve 570. In the non-engagement phase in which is matched with, the first engagement portion 688 can be fitted and disengaged in the axial direction. When only the first engaging portion 688 is fitted into the cutout 754, most of the first engaging portion 688 fits into the large diameter hole portion 752 of the axial hole 746, but not the whole.
However, when the drill holder 572 is relatively rotated from the non-engaging phase by the first angle, the cam action of the chamfered portion 690 of the first engaging portion 688 and the second engaging portion 758 causes the engaging member 680 to spring. The movable sleeve 700 is moved toward the opening end side of the movable sleeve 700 against the urging force of the 686, and the first engaging portion 688 axially and irremovably engages with the second engaging portion 758 and remains in the engaged state. Further drill holder 572
Is relatively rotated by the second angle to reach the engagement phase with the first engagement portion 688.

As is apparent from FIG. 29, the fitting shaft portion 59
A cam cutout 762, which is a cam portion, is formed on the rear end surface 744 of the reference numeral 6. The cam notch 762 is formed along the outer peripheral edge of the rear end surface 744 of the fitting shaft portion 596, and engages with the cam projection 704 formed on the movable sleeve 700 to prevent the movable sleeve 700 from moving in the axial direction. It is supposed to be controlled. The cam notch 762 includes a first inclined surface 764 and a second inclined surface 766, which are a pair of inclined surfaces that are formed to face each other on both sides of the notch 754. Both inclined surfaces 764 and 766 are 45 with respect to the axial direction.
It is inclined at an angle (75 degrees in the illustrated example) larger than a degree.

By fitting the fitting shaft portion 596 into the fitting hole 18 with the first engaging portion 688 and the second engaging portion 758 in the non-engaging phase, the rear end surface 744 is cam-projected. 70
4, the movable sleeve 700 is moved toward the base end side of the sleeve 570 against the biasing force of the spring 720. Therefore, the attraction force of the engagement member 680 is reduced only to the urging force of the spring 686 as described above, and the first engagement portion 688 and the second engagement portion 758 move from the non-engagement phase to the first angle relative position. The camming action of the chamfer 690 facilitates engagement during rotation.

When the drill holder 572 is further rotated and the first engagement portion 688 and the second engagement portion 758 are in the engagement phase, the movable sleeve 700 is springed by the matching of the cam projection 704 and the cam notch 762. The urging force of 720 allows the sleeve 570 to move toward the distal end side. Therefore, the urging force of the spring 720 is converted into the attraction force of the engagement member 680 by the force conversion device 740, and the drill holder 572 engaged with the engagement member 680 is pulled into the sleeve 570 with a large force, so that the flange Part 61
8 is strongly attracted to the end surface 615 of the sleeve 570. The engagement piece 582 of the collar 578 and the one-sided inclined notch 614 provided on the sleeve 570 are in phase with each other when the first engagement portion 688 and the second engagement portion 758 are in the engagement phase. It is provided in the position.

On the other hand, the first engaging portion 688 and the second engaging portion 75
8 is in the engagement phase and the drill holder 572 is rotated to the non-engagement phase, the cam projection 7
04 engages with the first inclined surface 764 or the second inclined surface 766 (which is to be engaged depends on the rotation direction of the drill holder 572), so that the movable sleeve 700 resists the biasing force of the spring 720. It is moved to the base end side of 570. With respect to the inclination angles and directions of the inclined surfaces 764 and 766, the rotation of the drill holder 572 in the direction from the engaging phase to the non-engaging phase with respect to the sleeve 570 is converted into the movement of the movable sleeve 700 toward the proximal side of the sleeve 570. Is decided to be. Moreover, since the inclination angles of the first and second inclined surfaces 764 and 766 of the cam cutout 762 are determined to be the magnitude that causes the boosting action,
The movable sleeve 7 has a relatively small relative rotational moment.
00 against the urging force of the spring 720 and the sleeve 57.
It can be moved to the base end side of 0.

The attachment of the drill holder 572 to the sleeve 570 in the tool holding device configured as described above will be described. In the present embodiment, the sleeve 648 is attached to the engagement member 680, the movable sleeve 700, and the force conversion device 7.
By assembling 40 or the like, the sub-assembly shown in FIG. 31 can be obtained. Therefore, first, the sub-assembly is assembled and then the sleeve 570 is assembled.
The male screw portion 660 of the male screw member 656 is inserted into the female screw hole 642 formed in the bottom surface 640, and the pin 672 is fitted into the eccentric hole 644.
By inserting a tool from the through hole 691 of the engaging member 680 and engaging with the hexagonal hole 662 of the male screw member 656 and tightening it, the subassembly can be fixed to the sleeve 570 as shown in FIG. . Thus, the sub-assembly can be assembled outside the sleeve 570 and later fixed to the bottom surface 640 of the fitting hole 18, so that the sleeve 648, the movable sleeve 700, and the engaging member 6
80, the force conversion device 740, etc., can be easily assembled as compared with the case where they are individually assembled in the sleeve 570.

Further, in this embodiment, the pin 672 is used.
Since the sleeve 648 is attached to the sleeve 570 at a specific position where the sub-assembly is fitted into the eccentric hole 644, the subassembly and the sleeve 570 can be always assembled in a predetermined relative phase. Further, by fitting the pin 672 into the eccentric hole 644, relative rotation of the sleeve 648 with respect to the sleeve 570 is reliably prevented.

Then, the drill holder 572 is attached to the sleeve 5.
Attach to 70. First, as shown in FIG. 23, the first engaging portion 688 can be fitted into the notch 754 of the drill holder 572, that is, the second engaging portion 658 and the first engaging portion 68.
The fitting shaft portion 596 is inserted into the fitting hole 18 in a state in which 8 and 8 are in the non-engaging phase. When the drill holder 572 is not attached, the engagement member 680 is in the original position where it abuts the bottom surface of the bottomed hole 650, and the steel ball 6 of the force conversion device 740 is in the original position.
78 is located in the deepest part of the cam groove 734, the movable sleeve 700 is kept in the movement limit position where the end surface 702 abuts the flange portion 708 without engaging with the steel ball 678 on the first inclined surface 730. There is.

However, as shown in FIG. 34, if the fitting shaft portion 596 is inserted into the base end side of the sleeve 570 until the flange portion 576 contacts the end surface 615, the rear end surface 744 of the fitting shaft portion 596 is cammed. The movable sleeve 700 is brought into contact with the protrusion 704 and resists the biasing force of the spring 720, and
Move to the base end side of 70. Thereby, the cam groove 728
Moves to a position facing the steel ball 678, and the steel ball 678 can freely move radially outward. It should be noted that the drill holder 572 does not fit into the sleeve 570 deeper than the position where the flange portion 576 contacts the end surface 615. In the present embodiment, the flange portion 576 and the end surface 615 form a fitting limit defining device. I am configuring. In addition, the end surface 594 of the flange portion 576 is the end surface 6 of the sleeve 570.
Although the engagement piece 582 of the collar 578 abuts the end surface 615 before abutting on the collar 15, since the biasing force of the spring 592 is set to be small, the collar 578 is easily advanced with respect to the drill holder 572. Flange 57
6 can be brought into contact with the end face 615 without hindrance.

In this state, the drill holder 572 is rotated by the first angle, and as shown in FIG. 35, the second engaging portion 758 and the first engaging portion 688 are engaged with each other in the axial direction in a non-separable manner. At this time, the engagement member 680 is slightly pulled out from the sleeve 648 by the cam action of the chamfered portion 690 of the first engagement portion 688 and the second engagement portion 758, but the drill holder 572 is rotated by the first angle. Spring 72 during
Since the attraction force based on the biasing force of 0 is not applied to the engagement member 680, that is, the attraction force is relaxed, the first engagement portion 688 and the second engagement portion 758 can be easily engaged. Can be combined. However, since the engaging member 680 is urged toward the bottom surface of the sleeve 648 by the urging force of the spring 686, it does not move freely in the axial direction, and the first engaging portion 688 and the second engaging portion 758. Stable engagement with.

With the engagement of the first engaging portion 688 and the second engaging portion 758, the engaging member 680 is separated from the bottom surface of the sleeve 648, and the second inclined surface 736 engages with the steel ball 678. This is pushed outward in the radial direction to a position where it can be engaged with the first inclined surface 730. However, since the movable sleeve 700 is still retracted at this point, the first inclined surface 730 is
Does not actually engage the steel ball 678. Engaging member 6
80's attractive force remains relaxed.

After engaging the first engaging portion 688 and the second engaging portion 758 as described above, the drill holder 572 is further rotated by the second angle, and as shown in FIG. The engagement part 758 is made to reach the engagement phase with the first engagement part 688. By rotating the drill holder 572 at the second angle, the cam protrusion 704 is aligned with the cam notch 762,
The movable sleeve 700 is moved toward the movement limit position by the urging force of the spring 720. Along with this movement, the first inclined surface 730 engages with the steel ball 678 and moves inward in the radial direction to engage with the second inclined surface 736, so that the biasing force of the spring 720 is boosted. Composite member 6
80. Therefore, the drill holder 572 is strongly pulled toward the base end side of the sleeve 570, and the flange portion 5
76 is strongly pressed against the end face 615. In the present embodiment, the force conversion device 740 constitutes an attracting force applying device together with the compression coil spring 720, and the engaging member 6
80, the second engaging portion 758 as the engaged portion and the attracting force imparting device constitute a contact state maintaining device, and the second contact portion 615 that is the first contact surface and the end surface 615 of the flange portion 576 are pressed. The end face 594, which is the contact surface, constitutes an axial movement blocking device which is a kind of axial movement limiting device.

The first engaging portion 688 and the second engaging portion 75
8 while engaging the drill holder 572 with the second angle while engaging the engagement member 68 by the force conversion device 740.
Although the attracting force of 0 becomes strong, the first engaging portion 688 and the second engaging portion 758 are already engaged with each other in a plane perpendicular to the axial direction,
The drill holder 572 mainly includes both engaging portions 688 and 758.
Since it suffices to overcome the frictional force between the space and the flange portion 576 and the end surface 615 to rotate, it is possible to rotate up to the engagement phase with a relatively small force.

By rotating the drill holder 572 by the second angle, the pair of engaging pieces 582 of the collar 578 and the one-sided inclined notch 614 of the sleeve 570 are brought into phase with each other.
As shown in FIG. 6, the engaging piece 582 is provided with the constant width notch 5 of the flange portion 576 by the urging force of the compression coil spring 592.
It is made to protrude from 88 and is fitted in the one-sided inclined notch 614. The engaging piece 582 engages with the one-sided inclined notch 614 at the one-sided inclined engaging portion 586 without clearance in the rotational direction, and the end surface of the collar 578 on which the engaging piece 582 is provided is separated from the flange portion 576. The protruding end of the engaging piece 582 is formed as a one-sided inclined engaging portion 586, and the width of the protruding end is smaller than the width of the one-sided inclined notch 614 on the front end side. And it can be inserted securely.

Further, the fitting shaft portion 59 of the drill holder 572
When the 6 is fitted into the fitting hole 18, the taper outer peripheral surface 608 of the collet 604 has the taper inner peripheral surface 620 of the fitting hole 18.
And is moved by the tapered inner peripheral surface 620 to the flange portion 576 side while being reduced in diameter in the annular groove 612, and also on the front groove side surface of the annular groove 612 located on the flange portion 576 side. , The state in which the side surface of the rear groove located on the opposite side does not come into contact with the side surface of the rear groove. As described above, the collar 578 is biased by the compression coil spring 592, and the engaging piece 58
2 is fitted in the one-sided inclined notch 614 and the flange portion 576 is pressed against the front end surface of the sleeve 570, the disc spring 606 urges the collet 604 to reduce the diameter of the collet 604 and the straight inner peripheral surface 610. Is closely attached to the fitting shaft portion 596 of the drill holder 572, and the tapered outer peripheral surface 608 is closely attached to the tapered inner peripheral surface 620 of the fitting hole 18, so that the fitting shaft portion 596 is radially aligned with the fitting hole 18. Can be fitted without play. The collet 604 is urged by the disc spring 606 and kept in a reduced diameter state, and is kept in close contact with the fitting shaft portion 596 and the tapered inner peripheral surface 620. Even if the surface 610, the tapered inner peripheral surface 620 of the fitting hole 18 and the outer peripheral surface of the fitting shaft portion 596 are not formed with high accuracy, the tapered outer peripheral surface 608 and the straight inner peripheral surface 610.
Can be in close contact with the tapered inner peripheral surface 620 and the fitting shaft portion 596, respectively. Therefore, the fitting shaft portion 596 is processed during processing.
The fitting hole 18 and the fitting hole 18 do not move relative to each other in the radial direction, and it is possible to prevent the parts of the tool holding device from repeatedly colliding and sliding and causing wear and fatigue. The collet 604 and the disc spring 606 constitute a radial relative movement prevention device that prevents relative movement in the radial direction based on the fitting clearance between the fitting shaft portion 596 and the fitting hole 18.

The spindle of the drill holder 572 thus held by the sleeve 570 is rotated by the sleeve 57
0 and collar 578. Then, after holding the drill holder 572 on the sleeve 570, the operator turns the drill holder 572 so that the side surface that receives the rotational torque transmitted from the engagement piece 582 at the time of processing the constant width notch 588 hits the engagement piece 582. Contact. A one-way clutch 598 is provided between the collar 578 and the drill holder 572, and the constant width cutout 588 of the drill holder 572 is provided.
Although the rotation in the direction in which the above-mentioned side surface of the above is brought into contact with the engagement piece 582 is allowed, the rotation in the opposite direction is prevented. Color 578
The engagement piece 582 provided on the sleeve 570 is engaged with the one-sided notch 614 of the sleeve 570 at the one-sided inclined engaging portion 586, and the orientation based on the cutting resistance between the sleeve 570 and the drill holder 572 via the collar 578. The relative rotation in the opposite direction is blocked, and the action of the one-way clutch 598 and the engagement piece 582, the constant width notch 588, and the one-sided inclined notch 61 are provided.
Due to the engagement with 4, the relative rotation of the fitting shaft portion 596 and the fitting hole 18 in both the forward and reverse directions is prevented. Therefore, even when the cutting resistance suddenly disappears during machining, the side surface of the constant width notch 588 does not rotate in a direction away from the engaging piece 582, and the state is always engaged with the engaging piece 582. To be kept. Although there is a slight clearance in the rotational direction between the engagement piece 582 and the constant width notch 588 due to the engagement, relative rotation based on this clearance is blocked by the one-way clutch 598, and the cutting resistance is increased. It is avoided that the engagement piece 582 and the side surface of the constant-width notch 588 or each part of the tool holding device repeatedly collide and slide due to the sudden disappearance of the both, thereby causing wear and fatigue to both. As described above, when a part of the engaging piece 582 is formed as the one-sided inclined engaging portion 586 and is engaged with the one-sided inclined notch 614 without clearance, the entire width of the engaging piece is constant. Although the clearance in the rotation direction between the engagement piece and the notch is smaller than that of the above, by providing the one-way clutch 598, relative rotation between the drill holder 572 and the sleeve 570 can be prevented. . Even if the one-way clutch 598 becomes abnormal, the clearance between the drill holder 572 and the sleeve 570 is small, so that the collision between the engagement piece 582 and the constant width notch 588 is small, and the wear is small. I'm done.

Further, in the present embodiment, the cutting fluid can be jetted from the tip of the drill 40 during cutting. The cutting fluid is supplied from the cutting fluid supply hole provided in the pull stud, and the fluid passage 6 of the axial hole 30, the female screw hole 642, the male screw member 656 of the mounting portion 24 of the sleeve 570.
64 and the through hole 691 of the engaging member 680 to flow into the drill holder 572. Then, the cutting liquid flows into the liquid passage of the drill 40 through the adjusting member 50 and the through holes 66 and 68 of the driver 52, and is jetted from the tip thereof.

When the pressurized cutting fluid is supplied to this cutting fluid supply passage, a force acts to separate the sleeve 570 and the drill holder 572 in the axial direction based on the fluid pressure. Is set so that the attraction force of the attraction force applying device is larger than the force for separating the sleeve 570 and the drill holder 572 from each other. The device of this embodiment is particularly effective when the cutting fluid is supplied at high pressure.

When removing the drill holder 572 from the sleeve 570, the collar 578 is moved to the non-acting position against the biasing force of the spring 592, and the pair of engaging pieces 5
82 is disengaged from the beveled notch 614 in the sleeve 570. Thereby, the drill holder 572 and the sleeve 570
It becomes possible to rotate relative to. In this state, rotate the drill holder 572 in either the forward or reverse direction to move the second engaging portion 758.
Is rotated until it becomes a non-engaging phase with the first engaging portion 688. At this time, the cam protrusion 704 of the movable sleeve 700 is engaged with either the first or second inclined surface 764, 766 of the cam notch 762, so that the movable sleeve 700 resists the biasing force of the spring 720 and the sleeve 570. It can be moved to the proximal side. Therefore, the engagement between the steel ball 678 and the first inclined surface 730 and the second inclined surface 736 is released, the attraction force of the engaging member 680 is relaxed, and the first engaging portion 68 is released.
8 and the second engagement portion 758 can be easily brought into the non-engagement phase. Further, the drill holder 572 has a sleeve 570.
When pulled out from the disc spring 606, the biasing force of the disc spring 606 is reduced, the collet 604 is loosened and separated from the fitting shaft portion 596, the sleeve 570, and the drill holder 572 is moved to the sleeve 570.
Does not interfere with the taking out of.

In this non-engaging phase, the first engaging portion 6
By engaging and disengaging the 88 and the second engaging portion 758, the engaging member 6
80 returns to the original position, and the drill holder 572 is pushed out of the sleeve 570 by the spring 720 via the movable sleeve 700. Therefore, the drill holder 572 can be easily pulled out from the sleeve 570, and a new drill holder can be attached.

Still another embodiment common to the first and second inventions will be described with reference to FIGS. In this embodiment,
The configuration of the contact state maintaining device for contacting the first contact surface of the sleeve and the second contact surface of the drill holder is different from the above-described embodiments, but other configurations are the same, and corresponding parts Are denoted by the same reference numerals and description thereof will be omitted, and different portions will be described.

Fitting shaft portion 1202 of the drill holder 1200
Is formed with a flange portion 1204 extending outward in the radial direction, and an engagement member 1206, which is a relative rotation limiting member, is axially movable from the flange portion 1204 of the holder body 1205 to the tool holding portion 42 side. Is fitted to. The engaging member 1206 is a ring-shaped collar having a circular cross section, and as shown in FIG.
The fitting portion 1207 to be fitted to 0, and the engaging piece projecting in the axially extending direction at two diametrically separated locations on one end surface of the fitting portion 1207, which are separated from each other in the axial direction. And 1208.

These engagement pieces 1208, as one engagement piece 1208 is representatively shown in FIG. 39, have a base end portion in which two side surfaces extending in the axial direction are both parallel to the axial direction and have a width. The constant width engaging portion 1210 is a constant width engaging portion 1210.
The protruding end portion following 10 is inclined in a direction in which one of two side surfaces extending in the axial direction is parallel to the parallel surface 1212 and the other side is closer to the parallel surface 1212 from the base end side toward the protruding end side. One-sided inclined engaging portion 121 that is the inclined surface 1214
6. Each of the one-sided slant engagement portions 1216 of the two engagement pieces 1208 includes a drill holder 1200 and a sleeve 122.
It is formed so as to prevent relative rotation with respect to 0 in the forward and reverse directions.

Each of the engaging pieces 1208 is fitted into two constant width notches 1222 formed in the flange portion 1204 so as to be relatively movable in the axial direction. Engaging member 12
As shown in FIG. 38, 06 is a compression coil spring 1226 as an elastic member which is a kind of urging means arranged between the spring receiver 1224 and the engagement piece 1208 so that the engagement shaft 1208 of the flange portion 1204 is fitted. The end surface 122 on the side of the portion 1202
8 is urged in the direction of protruding from the fixed width engaging portion 1210.
Is fitted into the constant width notch 1222. It should be noted that, as shown in FIG.
Notches 1 that are separated from the fitted position of 208 and axially penetrate into two diametrically separated locations.
229 is provided (only one is shown in the figure). Further, as shown in FIG. 38, notches 1230 and 1232 penetrating in the axial direction are respectively formed at two positions in phase with the notch 1229 in the rotation direction of the fitting portion 1207 and the spring receiver 1224 (see FIG. 38). Is 1
Each shown).

Flange portion 1204 of holder body 1205
As shown in FIG. 37, a cylindrical collar 1240 is fitted to the tool holding portion 42 side so as to be relatively movable and relatively rotatable in the axial direction. One end of the collar 1240 is a fitting part 1242 that is fitted into the holder body 1205, and the other end is an annular part 1244 whose inner diameter is slightly larger than the diameter of the flange part 1204. Annular part 124
On the inner peripheral surface of the end portion of the No. 4 opposite to the fitting portion 1242, engaging projections 1246 extending inward in the radial direction are formed at two locations diametrically separated from each other. Color 1
240 is the holder body 1205 at the fitting portion 1242.
The clamp nut 100 is fitted between the fitted portion and the flange portion 1204, and the annular portion 1244.
Is applied to the engagement member 1206 and the flange portion 1204, and is urged in a direction in which the engagement projection 1246 is separated from the end surface 1228 of the flange portion 1204 by a compression coil spring 1248 as an elastic member which is a kind of axial urging means. Has been done. The compression coil spring 1248 is shown in FIG.
As shown in FIG. 8, the spring retainer 1249 attached to the holder main body 1205 and the bottomed hole 1250 opened at the end surface of the fitting portion 1242 of the collar 1240 are disposed, and a part of the housing is accommodated in the collar 1240. Has been done.

Two engaging protrusions 1246 are provided at two locations diametrically separated from each other in the fitting portion 1242 of the collar 1240.
To the position where the phase in the rotation direction matches
A steel ball 1252 which is a sphere is fitted. Fitting part 124
Two through holes 1254 penetrating in the radial direction are formed in 2 and a steel ball 1252 is movably fitted therein, and a pin 1256 prevents the steel ball 1252 from being pulled out from the through hole 1254. Part of the outer peripheral portion of each of these steel balls 1252 is projected from the inner peripheral surface of the collar 1240, and is fitted into the cam groove 1258 formed on the outer peripheral surface of the holder body 1205.

The cam groove 1258, as shown in FIG.
Axial groove 12 extending parallel to the axial direction of the collar 1240
60, and is made to extend in the circumferential direction from the end of the axial groove portion 1260 farther from the flange portion 1204,
Inclined groove portion 126 inclined toward the circumferential direction so as to extend away from the flange portion 1204 toward the extended end.
And 2. The axial groove portion 1260 is an inclined groove portion 1262.
It is made to extend in an obtuse angle direction.
This inclination angle is 3 degrees in the present embodiment. Further, the cam groove 1258 is formed at a position where the phase of the axial groove portion 1260 in the rotation direction matches one of the two constant width notches 1222. With the drill holder 1200 removed from the sleeve 1220, the collar 12
40 is biased by a compression coil spring 1248,
Steel ball 1252 is inclined groove portion 1262 of axial groove portion 1260.
Is brought into contact with the end surface on the side opposite to the side from which the extension is made to extend, and the engaging projection 1246 is located at a non-acting position apart from the end surface 1228.

An annular gap 1264 having an annular portion 1244 as a peripheral wall is formed between the fitting portion 1242 of the collar 1240 and the engaging member 1226, and the gap 1264 is made of an elastic member which is a kind of rotation urging means. A tension coil spring 1266 as a member is arranged. The tension coil spring 1266 is wound around the holder body 1205, one end of which is locked by a pin 1268 fitted to the holder body 1205, and the other end of which is locked by the inner peripheral surface of the collar 1240. Tension coil spring 126
6, the steel ball 1242 is urged in the direction in which the steel ball 1242 moves in the inclined groove portion 1262 in the direction away from the axial groove portion 1260.

The collar 1240 corresponds to the drill holder 1200.
Is removed from the sleeve 1220, it is moved in the axial direction by the urging force of the compression coil spring 1248, and the steel ball 1252 is an end surface on the side opposite to the side where the inclined groove portion 1262 of the axial groove portion 1260 is extended. To abut. The collar 1240 is also slightly moved in the rotational direction by the urging force of the tension coil spring 1266 so that the steel ball 1252 engages with the groove side surface of the axial groove portion 1260 that extends in the axial direction and is prevented from rotating, thereby engaging the protrusion. Part 124
6 is kept away from the end face 1228.

The collar 1240 has the holder body 1205 after the engaging member 1206 is attached to the holder body 1205.
Attached to. At the time of attachment, first, one end of the tension coil spring 1266 is locked to the inner peripheral surface of the collar 1240. Then, the fitting portion 1242 is attached to the holder body 12
05 and the extension coil spring 126
The other end of 6 is pulled out from the inside of the annular portion 1244 and locked to the pin 1268. At this time, the tension coil spring 1266 is in a state of being slightly extended from the free length. The collar 1240 is further attached to the holder body 1205.
The extension coil spring 1266 while rotating the tension coil spring 1266 in the extending direction while engaging with the engaging projection 1246 and the spring receiver 122.
4 of the notch 1232, the notch 1230 of the engaging member 1206 and the notch 1229 of the flange portion 1204 are in phase with each other, and the notch 1232, 1230, 1 of the engaging protrusion 1246.
Pass 229. After passing, the collar 1240 is further rotated while further extending the tension coil spring 1266, and the engagement protrusion 1246 and the engagement piece 1208 are in phase with each other. At this position, the through hole 1 into which the steel ball 1252 is fitted
254 and the axial direction groove portion 1260 of the cam groove 1258 are in phase with each other in the rotational direction, and the steel ball 1252 passes through the through hole 1254.
And then insert it in the axial groove 1260, the collar 1
240 is biased by the tension coil spring 1266 and slightly moved in the circumferential direction, the steel ball 1252 engages with the groove side surface of the axial groove portion 1260, and the collar 1240 forms the engaging protrusion 1246 and the engaging piece 1208. Are kept fitted in a position where their phases match. It should be noted that the constant width notch 1222 and the notch 1229 into which the engagement piece 1208 is fitted are the engagement protrusions when the collar 1240 is rotated and the drill holder 1200 is attached to the sleeve 1220 in the rotation direction as described later. The portion 1246 has a cutout 1229.
It is provided at an interval that does not reach. After the collar 1240 is fitted, the compression coil spring 1248 is attached to urge the collar 1240.

As shown in FIG. 37, the collet 12 is provided in the portion of the fitting shaft portion 1202 adjacent to the flange portion 1204.
70 is fitted and is biased by the disc spring 1272 in a direction away from the flange portion 1204. The collet 1270 has the same structure as the collet 604.

The tip of the sleeve 1220 is shown in FIG.
As shown in (a) and FIG. 39, an annular fitting groove 128 is formed.
0 is formed, thereby forming an outward flange 1282, and the outward flange 128 of the fitting groove 1280 is formed.
The side surface that determines 2 is the engaging surface 1284, and the opposite side surface is the stopper surface 1286. Sleeve 1
A sloping notch 1290 is formed in each of two diametrically separated portions of the tip end portion of 220. The one-sided inclined notch 1290 is opened to the end face 1292 which is the end face of the outward flange 1282 and the front end face of the sleeve 1220 and the outer peripheral face of the outward flange 1282, and has a length reaching the fitting groove 1280. And has a depth that does not reach the fitting hole 18 in the radial direction. Each of the one-sided inclined notches 1290 has a parallel surface 1294 in which one of two side surfaces of the sleeve 1220 extending in the axial direction is parallel to the axial direction.
The inclined surface 12 is inclined so that the other side approaches the parallel surface 1294 as it goes toward the rear end side of the sleeve 1220.
It is said to be 96. These one-sided cutouts 1290 are formed so as to prevent relative rotation between the drill holder 1200 and the sleeve 1220 in the forward and reverse directions, respectively. The collet 12 is provided at the tip of the fitting hole 18.
Inner surface 1 of taper corresponding to outer peripheral surface 1298 of 70
299 is formed.

Sleeve 1220 of drill holder 1200
The engaging projection 1246 of the collar 1240
And the engaging piece 1208 of the engaging member 1206 are in phase with each other in the rotational direction, and the fitting shaft portion 120 is in a state in which these and the one-sided inclined notch 1290 of the sleeve 1220 are in phase.
2 is inserted into the fitting hole 18. At this time, first, the engagement protrusion 1246 enters the inside of the one-sided inclined notch 1290, and FIG.
As shown in (a), the stopper surface 12 of the fitting groove 1280
86 and the engaging projection 1246 is entirely fitted into the fitting groove 1280.
Located inside, the engagement piece 1208 fits slightly within the one-sided bevel notch 1290.

When the fitting shaft portion 1202 is further inserted into the fitting hole 18 from this state, the collar 1240 is engaged with the engaging protrusion 1.
Since the 246 abuts on the stopper surface 1286 and cannot move, the drill holder 1200 cannot be moved.
Sleeve 48 against collar 1240 while compressing 48
20 and the engagement piece 1208 is moved to the side of 20 to form the one-sided cutout 1
It is further advanced into 290. Also, the drill holder 1
The steel ball 12 is moved by the relative movement between the 200 and the collar 1240.
52 moves in the axial groove portion 1260 toward the inclined groove portion 1262.

When the end surface 1228 of the flange portion 1204 abuts on the end surface 1292 of the sleeve 1220, or immediately before the abutment, the steel ball 1252 reaches a position where it can enter the inclined groove portion 1262 from the axial groove portion 1260, and the collar 1240. Is rotated by the urging force of the tension coil spring 1266, so that the steel ball 1252 is moved in the inclined groove portion 1262 in a direction away from the axial groove portion 1260.

Since the inclined groove portion 1262 is inclined so that the extending end portion from the axial groove portion 1260 is farther from the flange portion 1204, the collar 1240 is rotated by the tensile force of the tension coil spring 1266, and at the same time the compression coil is compressed. The engaging protrusion 1246 is moved in the direction of approaching the flange 1204 against the biasing force of the spring 1248, and the engaging protrusion 1 is moved as shown in FIG.
246 engages with the engagement surface 1284 of the outward flange 1282, and the end surface 1292 is the end surface 122 of the flange portion 1204.
Press on 8. The force with which the tension coil spring 1266 pulls the collar 1240 is boosted by the inclination of the inclined groove portion 1262, the end surface 1292 is firmly pressed against the end surface 1228, and the drill holder 1200 is inserted into the sleeve 1220.
It can be attached to without any axial gap. By the rotation of the collar 1240, the engagement protrusion 1246 can be engaged with the outward flange 1282 at a position different in rotational phase from the one-sided bevel notch 1290, and the end surface 1292 can be pressed against the end surface 1228. Engagement part 1 of this collar 1240
The position where 246 engages the engagement surface 1284 and presses the end surface 1292 against the end surface 1228 is the working position. In the present embodiment, the steel ball 1252 and the cam groove 1258 constitute the conversion device, and the tension coil spring 12
66 together with the attracting force imparting device, and together with the collar 1240 as an engaging member and the outward flange 1282 as an engaged portion, an abutting state maintaining device, and the end surface 1 as a first abutting surface.
The end surface 1228, which is a second contact surface, and the contact state maintaining device 292 constitute an axial movement blocking device that is a type of axial movement limiting device.

The limit of movement of the engaging piece 1208 of the engaging member 1206 into the side into which the one-sided inclined notch 1290 is fitted is defined by the one-sided inclined engaging portion 1216 engaging with the one-sided inclined notch 1290, and the end surface 1292 is When pressed against the end surface 1228, the engagement member 1206 causes the compression coil spring 1 to
The end face 12 is slightly retracted against the urging force of the 248.
The contact of 92 and 1228 is permitted. The engagement piece 1208 engages with the one-sloped notch 1290 in the one-sloped engagement portion 1216 without clearance in the rotation direction, and the drill holder 1200.
The relative rotation between the sleeve 1220 and the sleeve 1220 is small, and a highly durable tool holding device can be obtained.

The collet 1270 is the drill holder 1200.
Preventing the relative movement in the radial direction between the fitting shaft portion 1202 and the fitting hole 18 of the sleeve 1220 is the same as in the above embodiment.

The drill holder 1200 is attached to the sleeve 1220.
When removing from the steel ball 12, the collar 1240 is rotated against the biasing force of the tension coil spring 1266.
52 is located in the axial groove 1260. At this time, the collar 1240 is moved in the axial direction by a small distance in the direction in which the engagement protrusion 1246 is separated from the outward flange 1282, and the end surface 1228 of the end surface 1292 by the collar 1240 is moved.
Pressing to is released. In this state, the engaging protrusion 12
46 and the stopper surface 1286, there is no gap between them and the collar 1240 cannot be moved in the direction in which the engaging projection 1246 separates from the end surface 1228.
Is in phase with the one-sided notch 1290 of the outward flange 1282 in the rotational direction, the collar 1240 is moved in the direction away from the sleeve 1220 while maintaining the state of being rotated against the urging force of the tension coil spring 1266. Then, the steel ball 1252 engages with the end surface of the axial groove portion 1260 on the side of the inclined groove portion 1262, and the drill holder 1200 is moved in the direction of coming out of the sleeve 1220. As a result, a gap is created between the engaging protrusion 1246 and the stopper surface 1286, so that the collar 1240 is kept rotated against the urging force of the tension coil spring 1266, and the urging force of the compression coil spring 1248 keeps the collar 1240 rotating. When moved, the engaging protrusion 1246 is moved in a direction away from the end surface 1228. As a result, the steel ball 1252 enters the axial groove portion 1260, and the tension coil spring 12
The collar 1240 receives the biasing force of the axial groove portion 1260 and engages with the groove side surface parallel to the axial direction of the axial groove portion 1260 to prevent the collar 1240 from rotating. Collar 1240 or drill holder 120
It can be removed from the sleeve 1220 by holding the zero.

As described above, when the drill holder 1200 is attached to the sleeve 1220, the collar 1240 is biased by the compression coil spring 1248 and is kept in the non-acting position, and the fitting shaft portion 1202 is fitted into the fitting hole 18. Then, the collar 1240 may be rotated, and the sleeve 1220 supported by the support member may be attached to the drill holder 1200.
Can be attached with one hand. Further, also at the time of removal, by rotating the collar 1240 and moving it in the axial direction, the drill holder 1200 can be removed from the sleeve 1220 with one hand. However, when removing the drill holder 1200 from the sleeve 1220, after rotating the collar 1240, keep the collar 1240 rotated with one hand and the drill holder 120 with the other hand.
0 may be moved and removed from the sleeve 1220.

In the tool holding device shown in FIGS. 37 to 40, a one-way clutch may be provided between the fitting shaft portion of the drill holder and the fitting hole of the sleeve. For example, although the diameter of the tip portion of the fitting shaft portion that is fitted deepest in the fitting hole is reduced, and relative rotation in a direction based on machining resistance is allowed between the small diameter portion and the fitting hole. , A one-way clutch is provided to prevent reverse relative rotation. Three or more one-way clutches that are formed axially symmetrically with respect to the axis of the fitting shaft portion and that gradually reduce in the circumferential direction, and rolling elements that are arranged so as to be rollable in the circumferential direction in each of the gaps. , A biasing means for biasing each of the rolling elements toward the side with a smaller gap is provided, the relative movement of the fitting shaft portion and the fitting hole in the radial direction is prevented by the one-way clutch. can do. FIG.
In the tool holding device shown in FIG. 22 as well, a one-way clutch is provided, and the relative rotation between the fitting shaft portion and the fitting hole is reduced by the engagement between the engagement piece having the one-sided inclination engaging portion and the one-sided inclination notch. In addition to this, the one-way clutch may be used to prevent relative rotation, and the radial relative movement between the fitting shaft portion and the fitting hole may be prevented.

Further, in the tool holding device of each of the embodiments shown in FIGS. 23 to 36 and 37 to 40, the collet 60 is used.
4,1270 are disc springs 606,1 which is a kind of biasing means.
Biasing by 272 is not essential and the disc spring may be omitted. The drill holder fits into the sleeve,
When the flange is pressed against the tip of the sleeve,
It suffices to machine the collet, the tapered inner peripheral surface and the fitting shaft portion so that the collet closely contacts the tapered inner peripheral surface of the fitting hole and the fitting shaft portion of the drill holder.

Further, FIGS. 23 to 36, 37 to 40.
In each of the embodiments shown in FIG.
May be omitted, and the fitting shaft portion may be taper-fitted in the fitting hole to reduce the relative movement of the both in the radial direction. A tapered outer peripheral surface is formed on the fitting shaft portion, the diameter of which gradually decreases toward the tip, that is, as it moves away from the tool holding portion, and a tapered inner peripheral surface corresponding to the tapered outer peripheral surface is formed at the opening end of the fitting hole. , Fit tightly together. At this time, the first member and the second member may be brought into contact with each other at contact surfaces perpendicular to the axial direction to prevent movement in the axial direction,
Alternatively, the taper outer peripheral surface and the taper inner peripheral surface may be engaged to prevent movement in the axial direction.

Further, in the tool holding device of the embodiment shown in FIGS. 1 to 22, the collet is provided with a biasing means such as a disc spring, or only the collet is provided, and the collet is fitted in the radial direction between the fitting shaft portion and the fitting hole. You may make it prevent relative movement. Further, instead of providing the collet, the fitting shaft portion and the fitting hole may be taper-fitted to reduce the relative movement of the both in the radial direction.

Further, in the tool holding device of the embodiment shown in FIGS. 1 to 22, the engaging member 150 is provided with two steel balls 166, but the number of steel balls 166 is not limited to two, but three or more, or more. It may be provided.

Further, in the embodiment shown in FIGS. 23 to 36, after the drill holder 572 is attached to the sleeve 570, the one-way clutch 598 is attached to the operator before the sleeve 570 is attached to the spindle and used for machining. Was operated to remove the clearance in the rotational direction, but it is not essential to operate the one-way clutch 598 to remove the clearance here. When processing is started, the sleeve 570 and the drill holder 57
This is because the relative rotation of 2 and the engagement piece 582 comes into contact with the torque transmission surface of the constant width notch 588, and the relative rotation is blocked.

Further, the present invention can be applied to a tool holding device which holds a working tool other than a drill such as a tap.

Furthermore, the present invention can be carried out in a mode in which the combination of the constituent elements of each of the above embodiments is changed.
In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a front view (partial cross section) showing a state in which a drill holder that is a component of a tool holding device that is an embodiment common to the first and second inventions is attached to a sleeve.

FIG. 2 is a front cross-sectional view showing a state in which the contact state maintaining device of the tool holding device brings the drill holder and the sleeve into contact with each other in the axial direction, and the engagement piece engages with the one-sided notch.

FIG. 3 is a view showing a state in which the engagement piece is engaged with a one-sided inclined notch.

FIG. 4 is a front view showing a holder body of the drill holder.

FIG. 5 is a left side view showing the drill body.

FIG. 6 is a front view (partial cross section) showing a collar having the engaging piece.

FIG. 7 is a plan view showing the collar.

FIG. 8 is a right side view showing the collar.

FIG. 9 is a left side view showing the collar.

FIG. 10 is a right side view showing an engagement member that constitutes the contact state maintaining device.

FIG. 11 is a front sectional view showing the engagement member.

FIG. 12 is a plan view showing the engaging member.

FIG. 13 is a plan sectional view showing the engagement member.

FIG. 14 is a front view (partial cross section) showing a movable sleeve which constitutes the contact state maintaining device.

FIG. 15 is a left side view showing the movable sleeve.

FIG. 16 is a front view showing a tip portion of the sleeve in which a one-sided inclined notch is formed.

FIG. 17 is a left side view showing the sleeve.

FIG. 18 shows the phases of the collar engagement piece, the engagement protrusion of the engagement member, the protrusion of the movable sleeve, the one-sided notch of the sleeve, and the fitting notch in the rotation direction when the drill holder is attached to the sleeve. It is a figure explaining.

FIG. 19 is a view for explaining the attachment of the drill holder to the sleeve.

FIG. 20 is a view for explaining how to remove the drill holder from the sleeve.

FIG. 21 is a front view showing another mode of the first engagement notch, the second engagement notch and the engagement piece.

FIG. 22 is a front view showing still another aspect of the first engagement notch, the second engagement notch and the engagement piece.

FIG. 23 is a front cross-sectional view showing a state in which the tool holder of another embodiment common to the first and second inventions has started to be fitted into the sleeve of the drill holder.

24 is a front view showing a tip end portion of a drill holder, which is a component of the tool holding device shown in FIG. 23, into which a collar is fitted.

25 is a front view showing a tip end portion of the sleeve, which is a component of the tool holding device shown in FIG.

26 is a front view showing a state in which the collar engagement piece shown in FIG. 24 is fitted into the one-sided inclined notch of the sleeve shown in FIG. 25.

FIG. 27 is a front view (partial cross section) showing the entire drill holder shown in FIG. 24.

FIG. 28 is a left side view of the drill holder shown in FIG. 23.

FIG. 29 is a right side view of the drill holder shown in FIG. 23.

30 is an enlarged front cross-sectional view showing a state in which the attraction force applying device is attached inside the sleeve shown in FIG. 23.

FIG. 31 is an enlarged front sectional view showing the attraction force applying device taken out.

FIG. 32 is a front view showing the vicinity of a cam protrusion of a movable sleeve that is a component of the attraction force applying device.

FIG. 33 is a plan view showing the movable sleeve.

34 is a view showing a state where the drill holder of the tool holding device shown in FIG. 23 is further fitted to the sleeve from the state shown in FIG. 23.

35 is a view showing a state in which the drill holder of the tool holding device shown in FIG. 23 is rotated by a first angle from the state shown in FIG. 34.

36 is a view showing a state where the drill holder of the tool holding device shown in FIG. 23 is rotated by a second angle from the state of FIG. 35 and attached to the sleeve.

FIG. 37 is a front view (partial cross section) showing a tool holding device which is another embodiment common to the first and second inventions.

38 is a view for explaining how to attach the drill holder, which is a component of the tool holding device shown in FIG. 37, to the sleeve. FIG.

39 is a view showing a state in which the engagement pieces of the engagement member which is a component of the tool holding device shown in FIG. 37 are engaged with the constant width cutouts of the drill holder and the one-sided cutouts of the sleeve.

FIG. 40 is a view showing a portion of the holder main body of the drill holder which is a component of the tool holding device shown in FIG. 37, in which the engaging member is fitted and a cam groove is formed.

[Explanation of symbols]

 10 sleeve 36 drill holder 40 drill 42 tool holding part 110 flange part 114 constant width notch 124 engaging piece 126 constant width engaging part 132 one-side inclined engaging part 200 one-side inclined notch 570 sleeve 572 drill holder 576 flange part 582 engaging piece 584 Constant width engaging part 586 One-sided inclined engaging part 588 Constant-width notch 614 One-sided inclined notch 1200 Drill holder 1208 Engagement piece 1210 Constant-width engaging part 1220 Sleeve 1222 Constant-width notch 1290 One-sided inclined notch

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takefusa Sasamori 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Yasuo Kato 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Tahiro Takasaki 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd.

Claims (2)

[Claims] 1. A first member fixed to a machine tool having a first engagement notch extending in a direction parallel to an axis, a machining tool holder for holding a machining tool, and a second engagement extending in the axial direction. A second member that includes a notch and is relatively rotatably fitted around the first axis, and engageable across the first engaging notch and the second engaging notch An engaging piece, the engaging piece is engaged with the one of the first and second members by relative movement in the axial direction across the first and second engaging notches, A relative rotation limiting member held in a state in which it can take an operating position that prevents relative rotation of the second member exceeding a limited angle and a non-operating position that disengages from at least one of the first and second engagement notches; Tool holding including biasing means for biasing the relative rotation limiting member in a direction to move from the non-acting position side to the working position side In the device, at least one of the first engagement notch and the second engagement notch, one of the two side surfaces extending in the axial direction is a parallel surface parallel to the axial direction, and the other is from the non-acting position side to the working position side. With one-sided notch that is an inclined surface that is inclined in a direction approaching the parallel surface as it goes, the other side is a constant width notch where two side surfaces extending in the axial direction are parallel surfaces parallel to the axial direction,
The portion of the engaging piece that engages with the one-sided cutout is a one-sided inclined engaging portion having an inclined surface corresponding to the inclined surface of the one-sided cutout, and the portion of the engaging piece that engages with the constant width cutout has a width. Is a constant width constant engaging portion, and each parallel surface of the one-sided inclined notch and the one-sided inclined engaging portion on the opposite side to the respective inclined surfaces, the machining resistance for the machining tool held by the tool holding portion. The tool holding device is provided at a position where the first member and the second member are prevented from rotating relative to each other due to their machining resistance. 2. The relative rotation limiting member connects the engaging pieces to each other.
And the one-sided inclined engaging portions of the two engaging pieces are formed in directions that respectively prevent relative rotation between the first member and the second member in the forward direction and the reverse direction. The tool holding device according to claim 1, wherein: