JP2000254836A - Indexing device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fluctuation of the meshing position of a worm gear and worm wheel adopted combined in a turning mechanism while shortening the time required for indexing and improving indexing accuracy. SOLUTION: This device is constituted in such a way that a worm gear 61 is meshed with the worm wheel 60 fixed to the rotation side coupling 26 fixed to a rotary table 20 on which a tool rest body (rotary section) 11 is mounted, and a joint coupling 32, which meshes with both of the coupling 26 and a fixing side coupling 27 fixed to the support plate 9 of the tool rest 11, are provided between a meshing position and a mesh releasing position so as to be able to advance and retract. In addition, a reference plane piston 65, which is arranged between fixing side/rotary side, both couplings 26 and 27 and the support plate 9, is made a reference plane for the coupling 26 by being pressed against the fixing side coupling 26 when the joint coupling 27 is at the mesh position, and is movable to form a gap between the coupling and the reference plane piston 64 itself when the joint coupling 27 is at the mesh releasing position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing device for a machine tool in which a rotary portion to which a tool or a work is attached is rotatably indexed and clamped on a base, for example, a tool post indexing device for a combined machining lathe.

[0002]

2. Description of the Related Art Conventionally, a pedestal is rotatably mounted on a column base, a turret body is fixed to the pedestal, and a turning tool or a rotary tool is mounted on a tool spindle of the turret body. Index the base body to a predetermined angle position and clamp it,
There is a combined machining lathe capable of performing both turning and rotary tool machining.

Conventionally, as an indexing device for performing rotary indexing and clamping of the tool rest main body, a rotating side coupling and a fixed side coupling are respectively provided on the pedestal and the base so as to face each other, and the meshing teeth of both couplings are engaged with each other. A two-piece type to be clamped, or the above-mentioned rotating side and fixed side couplings are arranged so as to be coaxial, and the meshing teeth of the third coupling coupling are engaged with the meshing teeth of both couplings for clamping. There is a piece type.

[0004]

However, in the conventional two-piece type, it is necessary to move the entire tool rest body to a position where the engagement between the two couplings is released at the time of indexing. There is a problem that the operation amount becomes large, the indexing time becomes long, and the device becomes large.

In the above-mentioned conventional three-piece type,
During rotation of the tool post body, the rotary coupling attached to the pedestal supporting the tool post body comes into contact with the base and slides, so that the rotary coupling is worn.
There is a problem that the indexing accuracy at the time of clamping is easily reduced by repeating the turning operation.

Here, the present applicant has proposed an indexing device capable of solving the above-mentioned problems (Japanese Patent Application No. 9-235772). This indexing device is provided with a coupling coupling meshing with both the rotation-side coupling and the fixed-side coupling so as to be able to advance and retreat. It has a structure in which a spring that creates a gap between them is provided.

According to this indexing device, in the clamp operation, it is only necessary to move the coupling coupling forward and backward.
The indexing time can be reduced and the device can be simplified as compared with the two-piece type in which the entire rotating section is moved.
Further, since a gap is formed between the rotation-side coupling and the base at the time of releasing the engagement, the rotation-side coupling can be prevented from rubbing against the base, and the indexing accuracy can be prevented from being reduced due to wear.

On the other hand, the applicant of the present application is studying the use of a combination of a worm wheel and a worm gear from the viewpoint of increasing the gear strength of a mechanism for driving the rotation-side coupling to rotate. By the way, in the case of the combination of the worm wheel and the worm gear, it is necessary to avoid the fluctuation of the meshing position of both. However, if the above-mentioned worm wheel is fixed to the rotation-side coupling and a structure is formed in which the rotation-side coupling is moved to form a gap between the worm and the base, the meshing position of the worms may fluctuate. It is necessary to take countermeasures.

In the above-mentioned conventional three-piece coupling type indexing device, the tool post body is clamped at a predetermined indexing angle position by engaging the meshing teeth of each coupling with each other. This is determined by the pitch of the meshing teeth, and there is a problem that the index pitch is limited.

[0010] The present invention has been made in view of the above-mentioned circumstances, and a meshing position when a combination of a worm gear and a worm wheel is employed in a turning mechanism while shortening the indexing time and improving the indexing accuracy. It is an object of the present invention to provide an indexing device for a machine tool that can prevent the fluctuation of the angle and can also determine an arbitrary angle position.

[0011]

According to a first aspect of the present invention, there is provided an indexing device for a machine tool having a rotating portion to which a tool or a work is attached, rotatably indexed and clamped on a base, wherein the indexing portion is fixed to the rotating portion. A coupling coupling that meshes with both the rotation-side coupling and the fixed-side coupling fixed to the base to fix the rotation-side coupling at a specified indexing angle position between the engagement position and the disengagement position. A reference surface piston is provided between the base and the fixed-side and rotation-side couplings so as to be able to advance and retreat, and the reference-surface piston is connected to the fixed-side coupling when the coupling coupling is at the meshing position. When the coupling is in the disengaged position, it forms a reference surface for the rotation-side coupling by being pressed against the rotation-side coupling. It is characterized by being movably configured to effect clearance.

According to a second aspect of the present invention, there is provided an indexing device for a machine tool in which a rotary unit to which a tool or a work is attached is rotatably indexed and clamped on a base, and a rotary coupling fixed to the rotary unit and the rotary coupling. A coupling coupling meshing with both the fixed side coupling fixed to the base side and fixing the rotation side coupling at a specified indexing angle position is provided so as to be able to advance and retreat between the engagement position and the engagement release position, A worm gear, which is rotationally driven by a rotation drive mechanism, meshes with a worm wheel fixed to the rotation-side coupling, and the rotation-side drive mechanism allows the rotation-side coupling to move to an arbitrary position when the coupling coupling is at a disengagement position. Indexable at the angular position, and fixing the rotating side coupling at the indexed angular position It is characterized in that a constant means.

[0013]

According to the indexing device according to the first aspect of the present invention, at the time of clamping, the reference surface piston presses against the fixed side coupling to form the reference surface of the rotating side coupling. The side coupling forms the same plane, and the coupling coupling is securely coupled to both the rotating side and fixed side couplings. In this case, since the reference surface piston abuts on the fixed side coupling and stops its movement, the thrust of the reference surface piston does not cancel out the thrust of the coupling and secures the clamping force. it can.

Further, at the time of unclamping, a gap is generated between the reference surface piston and the rotation side coupling by moving the reference surface piston, that is, without moving the rotation side coupling. The fixed worm wheel does not move, so that a change in the meshing position between the worm wheel and the worm gear can be prevented. As a result, a combination of a worm wheel and a worm gear having high gear strength can be adopted as the rotation drive mechanism, and the reliability of the indexing operation can be improved.

In the present invention, since the coupling coupling meshing with both the fixed side and the rotation side couplings is disposed so as to be able to move forward and backward, it is only necessary to move the coupling coupling forward and backward in the clamping operation. The indexing time can be shortened and the device can be simplified, as compared with the conventional two-piece coupling type in which the arm is moved.

Further, since a gap is formed between the rotating side coupling and the reference surface piston, it is possible to prevent the rotating side coupling from rubbing against the reference surface during the indexing rotation and to prevent the rotating side coupling from rotating. Wear can be prevented, so that the indexing accuracy can be prevented from lowering due to repetition of the clamping operation.

According to the indexing device of the second aspect of the present invention, when the coupling is in the disengaged position, the rotary coupling is driven to rotate to an arbitrary angle position, and the rotary coupling is indexed. Since it is fixed at an arbitrary angular position, arbitrary indexing becomes possible.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 5 are views for explaining a rotary indexing device for a combined machining lathe according to an embodiment of the present invention, and FIGS. 1 and 2 are perspective views of the combined machining lathe, left side surface. 3 and FIG. 5 are a sectional side view, a plan view, and an enlarged sectional view of a main part of the rotary indexing device, respectively. In FIG. 5, the left part from the axis A shows the unclamped state, and the right part shows the clamped state.

In FIG. 1, reference numeral 1 denotes a combined machining lathe (machine tool) capable of performing both turning and rotary tool machining. The combined machining lathe 1 is located on the right side when viewed from the front of the bed 2. A schematic structure in which a tailstock 3 is arranged so as to be movable left and right, a headstock 4 is fixedly arranged on the left side, and a carriage 5 is arranged so as to be movable left and right on the back side, and a tool rest 8 is mounted on the carriage 5. It has.

The headstock 4 is provided with a spindle having a chuck 6 for gripping a work, and the spindle is rotated by a spindle motor (not shown). The tailstock 3 is provided with a center 7 for holding the work with the chuck 6. In addition, 35 is a control panel, and 35a is a cover.

The tool rest 8 has a support plate (base) 9 movably arranged obliquely in the front-rear direction on the front inclined surface 5a of the carriage 5 and a rotary indexing device 10 on the support plate 9. It has a schematic structure in which the tool rest main body 11 is rotatably supported via the main body.

The tool rest main body 11 includes a tool spindle 14 having a tool T detachably mounted at a tip end thereof, and a tool spindle 14 having a tool T attached thereto.
And a spindle motor 13 mounted on the tool headstock 12 and rotatably driving the tool spindle 14. The rotation of the rotating shaft 13a of the spindle motor 13 is controlled by the transmission belt 13
The power is transmitted to the tool spindle 14 via b.

The rotation indexing device 10 is shown in FIGS.
As shown in FIG. 3, a turntable 2 supporting the tool post body 11 is provided.
0, a fixed base 31 disposed coaxially with the rotary base 20 and fastened to the support plate 9 by bolts 30 and the rotary base 20 is driven to rotate to a specified indexing angle position. A rotation drive mechanism 43, and a first clamp for clamping the turntable 20 at a specified indexing angle position.
A clamp mechanism 21 and a second clamp mechanism (fixing mechanism) 5 for clamping the turntable 20 at an arbitrary index angle position.
0.

The turntable 20 has a generally cup-like shape in which an upper wall 20c having an opening 20b is formed at the upper end of a cylindrical body 20a, and an annular flange 20d has a radius on the inner peripheral surface of the upper wall 20c. It protrudes in the direction.

The upper wall 20c of the rotary table 20 and the fixed table 31
A bearing 38 is interposed between the upper end portion and the outer peripheral surface of the upper end portion. The inner race 38a of the bearing 38 is positioned and fixed on the fixed base 31 by tightening a lock nut 40, and the outer race 38b is positioned and fixed on the rotary base 20 by tightening the fixing ring 42 with a bolt 41.

The first clamp mechanism 21 has an annular coupling 26 in a plan view, which is fixed to a lower end surface of the cylindrical body 20a of the rotary table 20 with bolts 25c, and is coaxial with the inside of the coupling 26. And a fixed-side coupling 27 having an annular shape in plan view and fixed to the upper surface of the support plate 9 by bolts 25d, and an outer peripheral surface of the fixed base 31 located above the couplings 26 and 27. And a coupling coupling 32 which is arranged between the inner peripheral surface of the brake ring 52 and is slidable in the axial direction.

On the lower surface of the coupling 32, the meshing teeth 2 formed on the upper surfaces of the couplings 26 and 27 are formed.
Meshing teeth 32a meshing with 6a and 27a are formed. The coupling coupling 32 advances and retreats in the direction of the axis A between a meshing position meshing with the meshing teeth 26a, 27a of the rotating side and fixed side couplings 26, 27 and a mesh releasing position for releasing the meshing. It has become.

The second clamp mechanism 50 is vertically movably disposed between a brake piston 51, which is disposed above the coupling coupling 32 and is annular in plan view, and the cylindrical body 20a of the turntable 20. And the above-mentioned cylindrical brake ring 52. Note that a slight gap is provided between the inner peripheral surface of the cylindrical body 20a and the outer peripheral surface of the brake ring 52. An upper step portion 52a is formed on an upper portion of an inner peripheral wall of the brake ring 52, and a lower end surface of the brake piston 51 is locked to the upper step portion 52a. A lower step 52b is formed at a lower portion of the inner wall of the brake ring 52.
In b, a protruding portion 32b formed so as to protrude outward at the lower end of the outer peripheral surface of the coupling coupling 32 can be locked.

A cooling oil supply member 55 having cooling oil passages 55a, 55a for the tool spindle is inserted into the fixed base 31 in the direction of the axis A. The fixed base 31 has an oil passage 56a for supplying a hydraulic pressure to a first oil chamber 56 formed by the coupling coupling 32, the brake piston 51, the fixed base 31, and the brake ring 52.
Further, an oil passage 57a for supplying oil pressure to the second oil chamber 57 formed by the fixed base 31 is formed. Reference numeral 58 denotes a seal member for preventing leakage of hydraulic pressure from the oil chambers 56 and 57.

When hydraulic oil is supplied to the first oil chamber 56 with a predetermined oil pressure, the coupling 32 is lowered, and the meshing teeth 32a of the coupling 32 are moved to the rotation side and fixed side couplings 26 and 27. The tool rest main body 11 is clamped at a specified angular position set by the pitch of the meshing teeth of each coupling.

A spring 59 for urging the coupling coupling 32 upward in FIG. 5 is provided in the hole 27a formed in the stationary coupling 27. When the oil passage 56a is opened, the hydraulic oil in the first oil chamber 56 is discharged to the outside, and the coupling 59 is raised by the spring 59 to release the clamp.

When hydraulic oil is supplied to the second oil chamber 57 at a predetermined oil pressure when the coupling coupling 32 is at the unclamping position (mesh releasing position), the brake piston 51 descends. The brake ring 52 is lowered, and the lower end surface of the brake ring 52 sandwiches and fixes the rotation-side coupling 26 with a reference surface piston 65 described later. Thereby, the tool rest main body 11 is clamped at an arbitrary angular position.

The coupling piston 32 is connected to the upper step 52a of the brake ring 52 by the brake piston 51.
, The coupling coupling 32 also descends, but the amount is about 0.3 mm. Therefore, when the brake piston 51 descends, the coupling coupling 32 meshes with the couplings 26 and 27. Never. Further, a slight gap is provided between the lower step portion 52b and the convex portion 32b at the time of clamping the arbitrary angle position.

When the oil passage 57a is opened,
The coupling coupling 32 is raised by the spring 59, and the projection 32 b of the coupling coupling 32 is engaged with the lower step 52 b of the brake ring 52 to raise the brake ring 52. Thereby, the fixing of the rotation side coupling 26 is released.

The rotation drive mechanism 43 arranges an annular worm wheel 60 in a plan view in an annular storage recess 9 b recessed in the support plate 9.
0 is fixed to the lower end surface of the rotation-side coupling 26 with a bolt 60a, and the worm wheel 60 is meshed with a worm gear 61 arranged in the housing hole 9a. A driven pulley 62a is provided on a drive shaft 61a of the worm gear 61, and a rotating shaft 63a of an index motor 63 is provided.
The drive pulleys 62b are respectively fixed to the
2 a and 62 b are connected by a transmission belt 62. Both ends and the center of the drive shaft 61a are rotatably supported on the support plate 9 by bearings 64.

Thus, the rotation of the indexing motor 63 is transmitted from the worm gear 61 to the turntable 20 via the worm wheel 60 and the rotation-side coupling 26, and the tool rest main body 11 is set to a predetermined rotation angle or an arbitrary rotation angle. Is determined. A slight gap b is provided between the lower end surface of the worm wheel 60 and the bottom surface of the storage recess 9b to prevent rubbing.

Worm wheel 6 in storage recess 9b
0, an annular reference plane piston 65 in the plan view
It is slidably disposed in the direction. The upper end surface of the reference surface piston 65 is provided with a rotation side and fixed side coupling 26,2.
7 are opposed to each other, and the reference surface piston 65
The bottom surface of the storage recess 9b faces the lower end surface of the storage recess 9b.

The support plate 9 has a third oil chamber 6 formed by the support plate 9 and the reference surface piston 65.
An oil passage (not shown) for supplying hydraulic oil to 6 is formed. When hydraulic oil is supplied to the third oil chamber 66 with a predetermined oil pressure, the reference surface piston 65 rises and presses against the lower end surface of the fixed side coupling 27, and the upper end surface of the reference surface piston 65 Becomes the reference surface of the rotation-side coupling 26. When the rotation-side coupling 26 is brought into contact with the reference surface, the engagement teeth 26a, 27a of the rotation-side coupling 26 and the fixed-side coupling 27 form the same plane.

A hole 67 is formed coaxially in the reference surface piston 65 and the fixed side coupling 27, and a spring 68 for urging the reference surface piston 65 downward in FIG. It is arranged. When the hydraulic oil in the third oil chamber 66 is discharged, the reference surface piston 65 descends, whereby a slight gap is formed between the upper end surface of the reference surface piston 65 and the lower end surface of the rotation-side coupling 26. a is formed.

Next, the operation and effect of the apparatus according to the present embodiment will be described. In the clamped state of the tool rest main body 11, the meshing teeth 32a of the coupling 32 mesh with the meshing teeth 26a, 27a of the rotation-side and fixed-side couplings 26, 27, as shown on the right side of the axis A in FIG. The reference surface piston 65 is locked to the lower end surface of the rotation-side coupling 26.

When indexing to a new angular position from the above clamped state, first to release the clamp, FIG.
As shown on the left side of the axis A of the oil passage 56,
a, 57a are released, the coupling coupling 32 is raised by the spring force of the spring 59, and accordingly, the hydraulic oil in the first oil chamber 56 is discharged through the oil passage 56a. The disengagement between the meshing teeth 32a of the 32 and the meshing teeth 26a, 27a of the couplings 26, 27 is released, and the clamp is released. At this time, the coupling 32 raises the brake ring 52 and the brake piston 51, the hydraulic oil in the second oil chamber 57 is also discharged, and the pressing of the rotation-side coupling 26 by the brake ring 52 is released.

The oil passage of the third oil chamber 66 is opened in accordance with the above-mentioned clamp releasing operation, and the reference surface piston 65 is lowered by the spring force of the spring 68. Is discharged, and a slight gap a is formed between the lower end surface of the rotation-side coupling 26 and the fixed-side coupling 27 and the upper end surface of the reference surface piston 65.

The indexing motor 63 rotates with the gap a formed, and this rotation is transmitted from the rotation-side coupling 26 to the turntable 20 via the worm gear 61 and the worm wheel 60, and the tool rest body 11 is moved. Indexed to the specified angular position. In this case, there are gaps between the rotation-side coupling 26 and the reference surface piston 65, and between the worm wheel 60 and the support plate 9, and wear does not occur in these portions.

When the rotation-side coupling 26 is indexed to a predetermined angular position, hydraulic oil is supplied to the third oil chamber 66 and the first oil chamber 56. As a result, the reference surface piston 65 rises and abuts on the lower end surface of the fixed side coupling 27 to stop moving, thereby forming the reference surface of the rotation side coupling 26. Also, the coupling coupling 32 descends, and the meshing teeth 32a of the coupling coupling 32 mesh with the meshing teeth 26a, 27a of the rotation-side and fixed-side couplings 26, 27,
As a result, the tool rest main body 11 is clamped at the index angle position. Turning is performed with the coupling coupling 32 clamped.

Next, when indexing to an arbitrary angle position from the clamped state of the tool rest main body 11, first, as described above, the coupling 32 is raised to release the clamp, and the reference surface piston 65 is moved. It is lowered to form a gap a. In this state, the rotary table 20 is rotated by the index motor 63, and the tool post main body 11 is indexed to an arbitrary angle position.

From the above state, hydraulic oil is supplied to the third oil chamber 66, the reference surface piston 65 rises and presses against the fixed side coupling 27 to form the reference surface of the rotation side coupling 26. Hydraulic oil is supplied to the second oil chamber 57 via an oil passage 57a, and the brake piston 51 is pressed downward and descends. With this descending, the brake ring 52 descends, and The end surface presses and urges the upper end surface of the rotation side coupling 26. Thus, the rotation-side coupling 26 is clamped and fixed between the brake ring 52 and the reference surface piston 65, and the tool rest main body 11 is clamped at an arbitrary indexing position. In this clamped state, a milling process for an oblique hole or the like is performed.

As described above, according to the present embodiment, the rotating side,
Since the reference surface piston 65 is disposed between the fixed couplings 26 and 27 and the support plate 9 so as to be able to move up and down by hydraulic pressure, the reference surface piston 65 is clamped by the coupling coupling 32 and by the brake ring 52. 65 presses against the fixed side coupling 27 to form a reference surface when the rotation side coupling 26 is clamped. In this case, since the reference surface piston 65 is in contact with the fixed-side coupling 27 and is prevented from moving further upward, the thrust of the reference surface piston 65 does not cancel out the thrust of the coupling 32. The coupling coupling 32 or the brake ring 52
Is the clamping force as it is.

At the time of rotation indexing, the reference surface piston 6
The worm wheel fixed to the rotation-side coupling 26 because the rotation-side coupling 26 does not move because the rotation-side coupling 26 does not move because the gap 5 is formed between the rotation-side coupling 26 and the rotation-side coupling 26. The movement of the worm wheel 60 and the worm gear 61 can be prevented from changing. As a result, a combination of the worm wheel 60 and the worm gear 61 having high gear strength can be employed, and the reliability of the rotation indexing operation can be improved.

In the present embodiment, the coupling coupling 32 is advanced and retracted by hydraulic pressure with respect to the rotation-side and fixed-side couplings 26 and 27, so that the clamping operation is performed by the advance and retraction of only the coupling coupling 32. Thus, the indexing time can be reduced as compared with the two-piece coupling type in which the entire tool rest is moved up and down.

Since the reference surface piston 65 is lowered to form a gap a between the reference surface piston 65 and the rotation-side coupling 26, the rotation-side coupling 26 is moved to the reference surface piston during the indexing operation. Therefore, it is possible to prevent wear due to friction, and to avoid a problem that indexing accuracy at the time of clamping is reduced by repeating the turning operation.

According to the present embodiment, the coupling 3
2 is disengaged from the rotating side and fixed side couplings 26 and 27, and the brake ring 52 is lowered by hydraulic pressure to clamp and fix the rotating side coupling 26 with the reference surface piston 65. 65 can be clamped at any angular position.

In the above embodiment, the case where the present invention is applied to the tool post indexing device of the combined machining lathe has been described, but the scope of the present invention is not limited to such a tool post. The present invention can be applied to, for example, a swivel table in a horizontal machining center. In other words, the present invention can be applied to any machine tool in which a rotating part to which a tool or a work is attached is rotatably indexed and clamped on a base. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view of a combined machining lathe provided with a rotary indexing device according to an embodiment of the present invention.

FIG. 2 is a left side view of the combined machining lathe.

FIG. 3 is a sectional view of the rotation indexing device.

FIG. 4 is a partially sectional plan view of a rotation drive mechanism of the indexing device.

FIG. 5 is a sectional side view of the indexing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combined lathe (machine tool) 9 Support plate (base) 10 Indexing device 11 Turret main body (rotating part) 26 Rotation side coupling 27 Fixed side coupling 32 Coupling 43 Rotation drive mechanism 21 First clamp mechanism 50 First 2 Clamp mechanism (fixing mechanism) 60 Worm wheel 61 Worm gear 65 Reference surface piston a Clearance T Tool

Claims (2)

[Claims] 1. An indexing device for a machine tool having a rotary part to which a tool or a work is attached rotatably indexable and clampable on a base, wherein the rotary coupling fixed to the rotary part and the base are fixed to the base. A coupling coupling meshing with both the fixed side coupling and fixing the rotation side coupling at a specified indexing angle position is provided so as to be able to advance and retreat between the meshing position and the meshing release position,
A reference surface piston is disposed between the fixed-side and rotation-side couplings and the base, and the reference-surface piston is rotated by pressing against the fixed-side coupling when the coupling is in the meshing position. An indexing machine tool, which forms a reference surface of the side coupling and is configured to be movable so as to create a gap between the coupling and the rotary side coupling when the coupling is in the disengaged position. apparatus. 2. An indexing device for a machine tool having a rotating part to which a tool or a work is mounted rotatably indexable and clampable on a base, wherein the rotating side coupling fixed to the rotating part and the rotating side coupling fixed to the base side. A coupling coupling meshing with both the fixed side coupling and fixing the rotation side coupling at a specified indexing angle position so as to be able to advance and retreat between a meshing position and a meshing release position; A worm gear, which is rotationally driven by a rotary drive mechanism, meshes with a worm wheel fixed to the worm wheel. When the coupling is in the disengaged position, the rotary drive mechanism can index the rotation-side coupling to an arbitrary angular position. And a fixing means for fixing the rotation-side coupling at the indexing angle position is provided. And a machine tool indexing device.