JPH1080805A - Tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder in which the positioning accuracy and stationary rigidity of a tool mounting head are high. SOLUTION: In a tool holder provided with a holder body 1, a tool mounting head 3 provided in the tip part of the holder body 1 so that it can move in the direction crossing the axis G of the holder body 2 at right angles, a driving shaft 4 the tip part of which can be projected into the tool mounting head 3, and structured so that the tool mounting head 3 is turned-moved in the direction crossing the axis G of the holder body 1 at right anfles through the tip part of the driving shaft 4 by pushing or pulling the driving shaft 4, the tip part of the driving shaft 4 extends along the axial direction to form a direction changing projected part T having parallel slopes on its both sides, and a pair of rolling shafts 6 on both sides, sloidably contacting both the slopes of the projected part T are provided at fixed positions of the tool mounting head 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool used by being mounted on a main shaft of a machine tool, for performing a boring operation such as boring by moving the tool in a direction perpendicular to the axis of a holder. About the holder.

[0002]

2. Description of the Related Art Conventionally, as this kind of tool holder, there is a tool holder described in Japanese Patent Application Laid-Open No. 5-27781.
In the tool holder described in this publication, a piston member is incorporated in a tool holder so as to be movable in the axial direction, a drive shaft is connected to a rear end of the piston member, and a distal end portion of the piston member extends along the axial direction. A sloped cam is formed on one side, and a tool mount is mounted on the lower end of the tool holder so as to be movable in the radial direction, that is, in a direction perpendicular to the axis. The tool mount is provided with a slope engaging with the slope cam. A spring is interposed between the body and the tool mount, and when the piston member moves forward, the tool mount is pressed by the inclined cam, and the axis moves in the direction perpendicular to the axis against the spring. It is supposed to.

[0003]

In the above-mentioned conventional tool holder, a slope cam for deflecting and moving the tool mount is formed only on one side along the axial direction of the piston member, and engages with the slope cam. Since the slope is provided on the tool mount and the spring is provided on the opposite side of the slope, pressure is applied in one direction perpendicular to the axis from the tool mount during machining, so that in the direction opposite to the pressure When a force is applied, the position of the tool mount becomes unstable, and the static rigidity of the tool mount depends on the spring pressure, resulting in poor positioning accuracy. Also,
Since the slope cam on the piston member side is engaged with the slope on the tool mount side by surface contact, the frictional resistance at the time of engagement is large, and it is difficult to smoothly change the direction of the tool mount base.

An object of the present invention is to provide a tool holder that can solve the above-mentioned problems.

[0005]

According to a first aspect of the present invention, a holder body 1 mounted on a main shaft 2 of a machine tool, and a tip end of the holder body 1 is movable in a direction orthogonal to an axis G of the holder body 1. And a drive shaft 4 which penetrates the center of the holder body 1 in the axial direction and whose tip end can protrude into the tool mounting head 3.
A tool holder which pushes and pulls the tool mounting head 3 through the tip of the drive shaft 4 to change its direction in a direction orthogonal to the axis G of the holder body 1. The portion extends along the axial direction of the drive shaft 4 and forms a deflection projection T having slopes 5 and 5 parallel to each other on both side surfaces thereof, and is formed on both slopes 5 and 5 of the projection T. A pair of guide means on both sides in sliding contact are provided at fixed positions of the tool mounting head 3, respectively.

A second aspect of the present invention is the tool holder according to the first aspect, wherein each of the guide means comprises a rolling shaft 6.

According to a third aspect, in the tool holder according to the first or second aspect, the rolling shaft 6 is in contact with the slope 5 with a required preload.

According to a fourth aspect of the present invention, in the tool holder according to any one of the first to third aspects, the rolling shaft 6 is provided on the inclined surface 5.
Characterized in that the position in which the contact is made can be adjusted.

A fifth aspect of the present invention is the tool holder according to any one of the first to fourth aspects, further comprising an elastic member 33 for pressing the drive shaft 4 against the rear end of the holder body 1 along the axial direction. It is characterized by having.

A sixth aspect of the present invention provides a holder main body 1 mounted on a main shaft 2 of a machine tool, a tool mounting head 3 provided at a tip end of the holder main body 1 so as to be movable in a direction orthogonal to an axis G of the holder main body 1. A drive shaft 4 is provided, which penetrates the center of the holder body 1 in the axial direction and has a front end that can protrude into the tool mounting head 3. By pushing and pulling the drive shaft 4, the front end of the drive shaft 4 is moved. A tool holder for turning the tool mounting head 3 in a direction orthogonal to the axis G of the holder main body 1 via a collet 30 provided at a rear end side of the drive shaft 4. The distal end of an operating shaft 34 for pushing and pulling the drive shaft 4 protrudes into the inside, and is formed at the rear end of the collet 30 in an annular concave portion 35 formed on the outer periphery of the distal end of the operating shaft 34. The thick annular convex portion 37 By being fitted engagement within Zehnder body 1, characterized in that this operation shaft 34 and the drive shaft 4 is adapted to be connected.

According to a seventh aspect of the present invention, in the tool holder according to the sixth aspect, a sleeve 32 having a distal end fixed in the holder body 1 is inserted between the collet 30 and the holder body 1. And

According to an eighth aspect of the present invention, in the tool holder according to the seventh aspect, the inner diameter of the annular convex portion 37 of the collet 30 is larger than the outer diameter of the distal end of the operating shaft at the coupling start position of the operating shaft and the drive shaft. The outer diameter of the convex portion 37 is larger than the inner diameter of the sleeve 32, and the distal end portion of the operating shaft 34 pushes the drive shaft 4 into the collet 30. The diameter is reduced so that the annular convex portion 37 is engaged with the annular concave portion 35 of the operation shaft 34.

A ninth aspect of the present invention is the tool holder according to any one of the sixth to eighth aspects, wherein the annular recess 3 of the operating shaft 34 is provided.
When the annular projection 37 of the collet 30 is engaged with the collet 5, the collet 30 is elastically deformed in the axial direction.

According to a tenth aspect of the present invention, there is provided a holder body 1 mounted on a main shaft 2 of a machine tool, a tool mounting head 3 provided at a tip end of the holder body 1 so as to be movable in a direction orthogonal to an axis G of the holder body 1. A drive shaft 4 is provided, which penetrates the center of the holder body 1 in the axial direction and has a front end that can protrude into the tool mounting head 3. By pushing and pulling the drive shaft 4, the front end of the drive shaft 4 is moved. A tool mounting head 3 which is deflected and moved in a direction orthogonal to the axis G of the holder body 1 through the shank portion 7 attached to the main shaft 2 of the holder body 1. The drive shaft 4 is arranged inside the pull bolt 29.

According to an eleventh aspect, in the tool holder according to the tenth aspect, the pull bolt 29 is attached to the holder body 1.
The outer peripheral portions 42a and 42b of both ends in the axial direction of the male screw portion 40 on the pull bolt 29 side for screwing to the shank portion 7 and the inner peripheral portions 43a and 42a of the female screw portion 41 on the shank portion 7 side in the axial direction.
43b is formed in a parallel-surface-shaped spigot fitting portion that can be fitted to each other.

According to a twelfth aspect of the present invention, in the tool holder according to the tenth or eleventh aspect, a sleeve 32 having a distal end fixed in the holder body 1 is inserted through the inner peripheral surface of the pull bolt 29. Features.

According to a thirteenth aspect, in the tool holder according to the tenth aspect, the pull bolt 29 is provided.
Is characterized in that an inner peripheral surface of the sleeve serves as a guide surface of the sleeve 32.

[0018]

FIG. 1 is a longitudinal sectional view of a tool holder according to the present invention, and FIGS. 2A to 2D are exploded perspective views of a main part. In these figures, reference numeral 1 denotes a main spindle of a machine tool. The holder body 3 mounted on the tool body 3 is a tool mounting head, which is mounted on the tip of the holder body 1 so as to be movable in a direction orthogonal to the axis G of the holder body 1. Reference numeral 4 denotes a drive shaft which penetrates the center of the holder body 1 in the axial direction, and has a front end which can protrude into the tool mounting head 3. The front end of the drive shaft 4 extends in the axial direction of the drive shaft 4. A turning projection T is formed which extends and has slopes 5 and 5 parallel to each other on both sides (see FIG. 3). Rolling shafts 6 and 6 serving as a pair of guide means on both sides are arranged at fixed positions of the tool mounting head 3.

As can be seen from FIGS. 1 and 2A and 2B, the holder body 1 is formed in a hollow shape, and has a tapered shank fitted to the main shaft 2 of the machine tool at its rear end. A portion 7 is formed, and a wide guide groove 9 having a central axis L1 orthogonal to the axis G of the holder body 1 is formed on an end face 8a of the large-diameter portion 8 on the distal end side. The tool mounting head 3 comprises a cylindrical main body 10 and a rectangular slider 11 integrally connected to the rear end of the cylindrical main body 10 so as to be orthogonal to the main body 10 so as to form a T-shape. so,
The slider 11 is slidably fitted in the guide groove 9 of the holder body 1, so that the axis L 2 of the cylindrical body 10 is always located on the center axis L 1 of the guide groove 9. Although the tool is not shown, it is attached to the tip end side of the cylindrical main body 10.
The shape of the plate is not limited to a cylindrical shape as long as a tool can be attached.

As shown in FIGS. 1 and 2B, the slider 11 of the tool mounting head 3 has a rectangular recess 12 formed at the rear end surface thereof, and the recess 12 has a back wall 12a. The smaller rectangular recess 13 is the cylindrical body 1
0 is formed so as to communicate with the hollow portion 10a (see FIG. 1). A pair of U-shaped frame pieces 14, 14 are fitted into both sides of the recess 12, and the pair of rolling shafts 6, 6 are disposed inside the U-shaped frame pieces 14, 14. Each rolling shaft 6 has both end side surfaces of the support shaft portion 6a abutting on both protruding end surfaces 14a, 14a of the U-shaped frame piece 14, and both end surfaces of the support shaft portion 6a are on the inner wall surface of the concave portion 12. It is rotatably supported within the U-shaped frame piece 14 in the abutted state. Thus, the turning projection T of the drive shaft 4 is inserted between the pair of rolling shafts 6 and 6 supported by the two U-shaped frame pieces 14, 14. 5 is held between the two rolling shafts 6 and 6.

As shown in FIGS. 2B, 4 and 5,
Each of the U-shaped frame pieces 14 is attached to the slider 11 from its outer end face.
A screw hole 15 is provided at a position facing the back surface of the screw hole 16, and the tip of a screw 16 screwed from each screw hole 15 is brought into contact with the back surface of each U-shaped frame piece 14. Each of the rolling shafts 6 is brought into contact with each of the slopes 5 of the deflection protrusion T with a predetermined preload via each of the U-shaped frame pieces 14. Therefore, by changing the screwing position of the screw tool 16 in each screw hole 15, the contact position of the rolling shaft 6 with respect to the inclined surface 5 of the diverting projection T can be changed, thereby adjusting the position of the tool mounting head 3. It is possible to change and adjust the preload applied to the slope 5 of the diverting projection T at the same time.

When the tool mounting head 3 is mounted in the guide groove 9 of the holder body 1, a bearing composed of a needle roller 17 is mounted on the slider 11 of the tool mounting head 3 on the front end face side and the rear end face side. That is,
As shown in FIGS. 2 (A), 2 (C) and 2 (D), the mounting plate 18 is located on the front end side of the slider 11 at a position symmetrical on both sides.
A mounting plate 19 is mounted on the front surface of the rear end surface, and a needle roller 17 is provided on each of the mounting plates 18 and 19. On the rear end surface of the slider 11, a rectangular movable frame 20 for holding the rolling shaft 6 and the U-shaped frame piece 14 is provided with bolts 21.
Has been fixed by. This movable frame 20 is shown in FIG.
As shown in FIG. 2A, the holder body 1 is fitted into a rectangular guide recess 22 formed in the bottom of the guide groove 9 of the holder body 1 so as to be movable in a predetermined range in the longitudinal direction thereof (FIGS. 2 and 4). ,
(See FIG. 5).

A head cover 23 for covering the slider 11 of the tool mounting head 3 is mounted on the tip of the holder body 1 to which the tool mounting head 3 is mounted. This head cover 23 corresponds to FIGS.
As shown in (B), a large diameter portion 8 on the distal end side of the holder body 1 is provided.
And a flange-shaped end wall portion 23b through which the cylindrical body 10 of the tool mounting head 3 is inserted. The large-diameter portion is formed through a bolt insertion hole 24 of the end wall portion 23b. The bolt 2 is inserted into the screw hole 25 provided on the end face 8a of the portion 8.
6 is fixed by screwing. As shown in FIG. 1, a slide cover 27 for closing a gap between the head cover 23 and the tool mounting head 3 is attached to the slider 11 of the tool mounting head 3, and an elastic sealing material 28 made of rubber, for example, is provided in the gap. Is loaded.

As described above, since the slider 11 portion of the tool mounting head 3 is covered by the head cover 23, the waterproof and dustproof properties of the portion can be ensured, and the slide cover 27 allows the head cover 23 and the tool mounting head 3 to be in contact with each other. The waterproofness and dustproofness of the gap can be ensured, and the waterproofness and dustproofness of the gap can be further enhanced by the elastic sealing material 28 loaded in the gap.

As shown in FIG. 7, the collet 30 has a thin portion 36 at the axially intermediate portion and a thick annular convex portion 37 at the rear end thereof. The outer peripheral end surface 37a and the inner peripheral end surface 37b are each formed in a tapered shape, and an inward flange 38 protrudes from the inner peripheral end portion of the collet 30. The collet 30 is fixed to the drive shaft 4 by locking the inward flange 38 to the rear end face of the drive shaft 4 and screwing the fixing bolt 31 into the drive shaft 4 from behind.
In the embodiment, since the coil spring 33 is used as the elastic member, the drive shaft 4 and the collet 30 are formed separately, but both may be formed integrally.

An operating shaft 34 for pushing and pulling the drive shaft 4 is inserted into the collet 30, and an annular concave portion 35 formed on the outer periphery of the protruding end of the operating shaft 34 is inserted into the collet 30. The operation shaft 34 and the drive shaft 4 are connected by engaging the annular convex portion 37. The annular convex portion 37 of the collet 30 is
When fitted into the annular concave portion 35 of No. 4, the tapered inner peripheral end surface 37b of the annular convex portion 37 is engaged with the corresponding tapered portion 35a of the annular concave portion 35 (see FIG. 7). still,
The operation shaft 34 is linked to a required push-pull drive unit (not shown), and the drive shaft means
The drive shaft 4 is pushed and pulled via the.

Before connecting the operating shaft 34 and the drive shaft 4, as shown above the axis G in FIGS. 1 and 7, the inner diameter of the annular convex portion 37 of the collet 30 is set at the tip of the operating shaft 34. Slightly larger than the outer diameter of the portion and its convex portion 37
Is larger than the inner diameter of the rear end of the sleeve 32. Then, the tip of the operating shaft 34 is fixed to the fixing bolt 31.
When the drive shaft is pushed forward by bringing the collet 30 into contact with the head 31a of the sleeve 32, the annular convex portion 37 of the collet 30 is compressed by the wedge action at the rear end of the sleeve 32 as shown in FIG. Diameter, this annular convex portion 37 is the annular concave portion 3 of the operation shaft 34.
5, whereby the operating shaft 34 and the drive shaft 4 are integrally connected via the collet 30 and the fixing bolt 31, and a state shown below the axis G in FIGS. 1 and 7 is obtained. In this state, the drive shaft 4 is pushed and pulled by the operation shaft 34.

As described above, the annular convex portion 37 of the collet 30
Is engaged with the annular concave portion 35 of the operation shaft 34, the tapered inner peripheral end surface 37b of the annular convex portion 37 is
5, the thin portion 36 of the collet 30 is elastically deformed by being pulled in the axially rearward direction by the wedge action. Accordingly, there is no axial gap between the annular convex portion 37 and the annular concave portion 35, the connection accuracy is increased, and the push-pull operation of the drive shaft 4 can be performed accurately.

As is clear from FIGS. 1 and 7, the drive shaft 4 is provided on the shank 7 of the holder body 1.
Is inserted and arranged in a pull bolt 29 screwed into
A collet 30 is coaxially fixed to the rear end of the drive shaft 4 by a fixing bolt 31 screwed along the axis of the collet 30, and an outer peripheral surface of the collet 30 and an inner peripheral surface of the pull bolt 29 are fixed. A sleeve 32 having a distal end fixed in the holder main body 1 is inserted therebetween, and an annular space between the inner peripheral surface of the sleeve 32 and the outer peripheral surface of the drive shaft 4 is provided with the drive shaft 4 in the axial direction. A coil spring 33 as an elastic member that presses against the rear end portion of the holder body 1, that is, the pull bolt 29 side, is interposed.

As shown in FIG. 7, the outer peripheral portions 4 at both ends in the axial direction of the male screw portion 40 on the pull bolt 29 side for screwing the pull bolt 29 to the shank portion 7 of the holder body 1 are provided.
The inner peripheral portions 43a and 43b in the axial direction of the female screw portion 41 on the shank portion 7 side are formed as parallel-plane spigot fitting portions that can be fitted to each other. Therefore, according to this, when replacing the pull bolt 29, the centering of the pull bolt 29 with respect to the shank portion 7 of the holder main body 1 can be easily performed. As shown in FIGS. 1 and 7, the sleeve 32 is
9 and the inner peripheral surface of the pull bolt 29 serves as a guide surface of the sleeve 32, so that the sleeve 32 can be easily held even if the pull bolt 29 is replaced.

The sleeve 32 has a large-diameter cylindrical portion 32a.
Is fitted into the fitting hole 44 of the holder body 1, and the head of the bolt 45 screwed axially into the opening end face of the fitting hole 44 is engaged with the tip end surface of the large-diameter cylindrical portion 32 a. Thereby, it is fixed at a fixed position in the holder main body 1 (see FIGS. 1, 4 and 5). Thereby, the material of the sleeve 32 that is in sliding contact with the drive shaft 4 with respect to the holder body 1 can be formed of a wear-resistant material, and can be used stably for a long period of time. In that case, the original function can be sufficiently achieved by replacing it.

In using the tool holder configured as described above, a tool holder having a cutting tool (not shown) attached to the tip of the cylindrical main body 10 of the tool mounting head 3 is mounted on the main shaft of the machine tool. The distal end of the operating shaft 34 is pushed into the collet 30 in the pull bolt 29 to
To the drive shaft 4 via the collet 30 and the fixing bolt 31.
Connect to With the operation shaft 34 connected to the drive shaft 4 in this manner, the main shaft is used to rotate the holder body 1 for a cutting motion. During this rotation, when the drive shaft 4 is pushed forward by the push-pull drive means (not shown) via the operation shaft 34, the two slopes 5, 5 of the turning projection T are set at a fixed position on the tool mounting head 3 side. The tool mounting head 3 is deflected and moved in a direction orthogonal to the axis G of the holder main body 1, that is, in a radial direction by a pair of rolling shafts 6 and 6 slidably in contact with each other, thereby performing boring such as boring or groove cutting. It can be carried out.

FIG. 4 is a longitudinal sectional view showing a state in which the drive shaft 4 has moved to the forward limit position and the tool mounting head 3 has been deflected to the right with respect to the axis G in FIG. The state is shown below the axis L1 in FIG. FIG. 5 shows a state in which the drive shaft 4 has returned to the retreat limit position and the tool mounting head 3 has been deflected and moved to the left in FIG.
Above the axis L1.

In this tool holder, the deflecting projection T of the drive shaft 4 is provided with slopes 5 and 5 parallel to each other on both sides thereof, and serves as a pair of guide means on both sides slidingly contacting the slopes 5 and 5. Since the rolling shafts 6 and 6 are provided at fixed positions of the tool mounting head 3, the position of the tool mounting head 3 is stabilized, the stationary rigidity is high, and the positioning accuracy is good. Further, since the guide means comprises the rolling shaft 6, the frictional resistance to the slope 5 is small, the deflection movement of the tool mount is smooth, the response is good, and the machining accuracy is improved.

Since each rolling shaft 6 is brought into contact with each slope 5 with a predetermined preload by the screwing operation of the screw 16, the stationary rigidity of the tool mounting head 3 is further increased. And the positioning accuracy becomes extremely good, so that the processing accuracy can be further improved. In this case, by changing the screwing position of the screw 16 in each screw hole 15, the slope 5 of the turning projection 6 is changed.
Therefore, the position of the tool mounting head 3 can be arbitrarily adjusted, and the preload applied to the slope 5 of the deflection projection 6 can be changed and adjusted as desired.

The drive shaft 4 is pressed against the pull bolt 29 along the axial direction by a coil spring 33 as an elastic member, so that the drive shaft 4 can be operated without restraining the drive shaft 4 from outside. And the collet 30 is ejected from the sleeve 32 so that the drive shaft 4 can be
Can be determined. A member other than the coil spring 33 may be used as long as the drive shaft 4 can be pressed against the pull bolt 29 along the axial direction. The drive shaft 4
Is adapted to be inserted into a pull bolt 29 screwed to the shank portion 7 of the holder body 1, so that it is possible to cope with a 7/24 taper shank of general JIS, ISO, DIN, and ANSI standards. The buckling force of the drive shaft 4 can be reduced.

[0037]

According to the tool holder of the first aspect,
The turning projection of the drive shaft has slopes parallel to each other on both sides thereof, and a pair of guide means on both sides slidingly contacting both slopes are provided at respective fixed positions of the tool mounting head. The position is stable, the static rigidity is high, and the positioning accuracy is good. Thereby, improvement in processing accuracy can be expected.

According to the second aspect of the present invention, since the guide means comprises a rolling shaft, the frictional resistance of the deflection projection against the slope is small, the deflection movement of the tool mount is smooth, and the response is good.
Processing accuracy can be further improved.

According to the third aspect of the present invention, the stationary rigidity of the tool mounting head can be further increased by bringing each rolling shaft into contact with each slope of the deflection projection with a predetermined preload. Even a slight angular error of the deflection projection can be tolerated, and the positioning accuracy becomes extremely good, so that the processing accuracy can be further improved.

According to the fourth aspect of the present invention, since the position at which each rolling shaft comes into contact with the slope can be adjusted, the position of the tool mounting head can be adjusted arbitrarily, and the preload applied to the slope is changed and adjusted as desired. be able to.

According to the fifth aspect, since the elastic member is provided for pressing the drive shaft to the rear end side of the tool holder along the axial direction, the operation of the drive shaft can be performed without restraining the drive shaft from outside. And the collet can be ejected from the sleeve to determine the position of the drive shaft at the time of tool change.

According to the sixth aspect, the connection area between the operation shaft and the drive shaft is increased by the collet, so that a large drive force can be transmitted. Also, a thick annular convex portion at the rear end of the collet is engaged with an annular concave portion formed on the outer periphery of the distal end of the operating shaft in the holder main body, and the operating shaft and the driving shaft are connected. Therefore, the two shafts can be connected firmly and reliably.

According to the seventh aspect of the present invention, since the sleeve whose distal end is fixed in the holder body is inserted between the collet and the pull bolt, the sleeve is worn by the collet sliding on the inner peripheral surface of the sleeve. It can be made of a wear resistant material so that it does not wear out and can be replaced if the sleeve wears out.

According to the eighth aspect, the connection area between the operation shaft and the drive shaft is increased by the collet, so that a large drive force can be transmitted. Also, a thick annular convex portion at the rear end of the collet is engaged with the annular concave portion formed on the outer periphery of the distal end of the operating shaft in the sleeve, so that the operating shaft and the drive shaft are connected. Therefore, the operation shaft and the drive shaft can be easily and quickly connected, and the two shafts can be connected firmly and reliably.

According to the ninth aspect, there is no axial gap between the annular convex portion of the collet and the annular concave portion of the operation shaft.
The connection accuracy is increased, and the push-pull operation of the drive shaft can be performed accurately.

According to the tenth aspect, a part of the shank mounted on the main shaft of the holder body is a pull bolt, and the drive shaft is disposed inside the pull bolt. Since the shank portion does not need to be formed up to the distal end portion, the shank portion can be formed as thick as it is and can have rigidity.

According to the eleventh aspect, when replacing the pull bolt, the pull bolt can be easily centered on the shank portion of the holder body.

According to the twelfth aspect, since the sleeve whose front end is fixed in the holder body is inserted through the inner peripheral surface side of the pull bolt, the sleeve can be formed separately from the holder body. it can.

According to the thirteenth aspect, since the sleeve is fitted into the pull bolt and the inner peripheral surface of the pull bolt serves as the guide surface of the sleeve, the sleeve can be easily held even if the pull bolt is replaced. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tool holder according to the present invention.

FIGS. 2A to 2D are exploded perspective views of a tip side portion of a tool holder.

FIG. 3 is a perspective view showing a drive shaft.

FIG. 4 is a longitudinal sectional view of a tip side portion of the tool holder in a state where the tool holder is rotated by 90 degrees around an axis from the state shown in FIG. 1 and shows a state where a drive shaft has moved to a forward limit position.

FIG. 5 is a longitudinal sectional view similar to FIG. 4, showing a state where the drive shaft is located at a retreat limit position.

FIG. 6 is a cross-sectional view of the tool holder.

FIG. 7 is an enlarged vertical sectional view of a rear end portion of the tool holder according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder main body 2 Machine tool main spindle 3 Tool mounting head 4 Drive shaft T Deflection projection 5 Slope of deflection projection 6 Rolling shaft 7 Holder body shank 9 Guide groove 23 Head cover 27 Slide cover 28 Elastic seal material 29 pull bolt 30 collet 31 fixing bolt 32 sleeve 33 coil spring (elastic member) 34 operating shaft 35 annular concave part 37 annular convex part 42a spigot fitting part 42b spigot fitting part 43a spigot fitting part 43b spigot fitting part

Claims (13)

[Claims] 1. A holder main body mounted on a main shaft of a machine tool, a tool mounting head provided at a distal end of the holder main body so as to be movable in a direction orthogonal to an axis of the holder main body, and a center portion of the holder main body in an axial direction. A drive shaft that penetrates and has a tip that can protrude into the tool mounting head.By pushing and pulling the drive shaft, the tool mounting head is moved in a direction orthogonal to the axis of the holder body through the tip of the drive shaft. A tool holder adapted to be deflectably moved, wherein a tip portion of the drive shaft extends along an axial direction of the drive shaft to form a deflecting projection having slopes parallel to each other on both side surfaces thereof. A tool holder, wherein a pair of guide means on both sides slidingly contacting both slopes of the projection are provided at fixed positions of the tool mounting head, respectively. 2. The tool holder according to claim 1, wherein each of said guide means comprises a rolling shaft. 3. The tool holder according to claim 1, wherein the rolling shaft is in contact with the slope with a required preload. 4. The rolling shaft according to claim 1, wherein a position at which the rolling shaft contacts the slope is adjustable.
The tool holder according to any one of the above. 5. The tool holder according to claim 1, further comprising an elastic member for pressing the drive shaft against a rear end portion of the holder main body along the axial direction. 6. A holder main body mounted on a main shaft of a machine tool, a tool mounting head provided at a front end of the holder main body so as to be movable in a direction orthogonal to an axis of the holder main body, and a center portion of the holder main body in an axial direction. A drive shaft that penetrates and has a tip that can protrude into the tool mounting head.By pushing and pulling the drive shaft, the tool mounting head is moved in a direction orthogonal to the axis of the holder body through the tip of the drive shaft. A tool holder adapted to be deflectably moved, wherein a collet is provided at a rear end side of the drive shaft, and a tip end of an operation shaft for pushing and pulling the drive shaft protrudes into the collet. A thick annular convex portion formed at the rear end of the collet is engaged with an annular concave portion formed on the outer periphery of the distal end portion of the operation shaft in the holder main body. Connected to the shaft A tool holder, characterized in that it is adapted to: 7. The tool holder according to claim 6, wherein a sleeve whose front end is fixed in the holder body is inserted between the collet and the holder body. 8. At the coupling start position between the operating shaft and the drive shaft, the inner diameter of the annular convex portion of the collet is larger than the outer diameter of the distal end portion of the operating shaft and the outer diameter of the convex portion is larger than the inner diameter of the sleeve. When the distal end portion of the collet pushes the drive shaft and pushes into the collet, the diameter of the annular convex portion side of the collet is reduced by the sleeve, and the annular convex portion is engaged with the annular concave portion of the operation shaft. The tool holder according to claim 7, wherein: 9. The collet according to claim 6, wherein the collet is elastically deformed in the axial direction when the annular projection of the collet is engaged with the annular recess of the operating shaft. Tool holder as described in. 10. A holder main body mounted on a main shaft of a machine tool, a tool mounting head provided at a distal end of the holder main body so as to be movable in a direction orthogonal to an axis of the holder main body, and a center portion of the holder main body in an axial direction. A drive shaft that penetrates and has a tip that can protrude into the tool mounting head.By pushing and pulling the drive shaft, the tool mounting head is moved in a direction orthogonal to the axis of the holder body through the tip of the drive shaft. A tool holder adapted to be deflected and moved, wherein a part of a shank portion attached to a main shaft of the holder body is a pull bolt, and the drive shaft is arranged inside the pull bolt. Tool holder. 11. An outer peripheral portion at both ends in the axial direction of a male screw portion on the pull bolt side for screwing the pull bolt to a shank portion of the holder body, and an inner peripheral portion at both axial ends of the female screw portion on the shank portion side are fitted to each other. The tool holder according to claim 10, wherein the tool holder is formed in a mating parallel-shaped spigot fitting portion. 12. The tool holder according to claim 10, wherein a sleeve having a distal end fixed in a holder body is inserted through an inner peripheral surface side of the pull bolt. 13. The sleeve according to claim 10, wherein an inner peripheral surface of the pull bolt serves as a guide surface of the sleeve.
The tool holder according to any one of claims 12 to 12.