JP2001219333A - Dividing device for attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dividing device for an attachment capable of preventing a defective dividing from occurring during dividing operation. SOLUTION: This dividing device for an attachment comprises a coupling 62 having the meshing teeth the number corresponding to the minimum dividing angle of the attachment 71, connecting and disconnecting the attachment 71 to and from a ram 61 by the movement of the attachment 71 in C-axis direction, a drive shaft 72 connected to the attachment 71 corresponding to the disconnection of the coupling 61 and dividing the attachment 71 by rotating in C-axis direction, and meshing tooth parts 81 and 82 as attachment rotation restricting means for guiding in the C-axis direction while the rotation of the attachment 71 about the C-axis is restricted before the connection of the attachment and drive shaft 72 is disconnected when the coupling 62 moves from a disconnected state to a connected state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment indexing device used for indexing an attachment mounted on a tip of a ram of a machine tool.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing an example of a portal type machining center. The machining center shown in FIG. 8 is a so-called portal-type machining center, which includes a cross rail 37 movably supported at both ends by respective axes of a portal column 38, and is movably supported on the cross rail 37. A ram 45 is provided movably in the vertical direction (Z-axis direction) via the saddle 44 provided.

[0003] The saddle 44 is provided with a nut (not shown) through the cross rail 37 in the horizontal direction, and a ball screw 41 is screwed into the nut. The Y-axis servo motor 18 is provided at an end of the ball screw 41, and the ball screw 41 is driven to rotate by the Y-axis servo motor 18. The saddle 4 is driven by the rotation of the ball screw 41.
4 can be moved in the Y-axis direction.

Further, the saddle 44 is provided with a nut (not shown) in the vertical direction, and the ball screw 42 is screwed into the nut. The Z-axis servo motor 20 is provided at an end of the ball screw 42. The ball screw 42 is rotationally driven by the Z-axis servo motor 20,
As a result, a ram 45 movably provided on the saddle 44
Is moved in the Z-axis direction.

[0005] A spindle motor 31 is built in the ram 45, and the spindle motor 31 rotationally drives a cutting tool T such as an end mill provided at the tip of the ram 45. Below the ram 45, an X-axis table 35 is provided movably in the X-axis direction. The X-axis table 35 has a nut (not shown), and a ball screw (not shown) provided along the X-axis direction is screwed to the nut, and the X-axis servomotor 19 is connected to the ball screw. Have been. The X-axis table 35 is moved in the X-axis direction by the rotation of the X-axis servo motor 19. Y-axis servo motor 1
8, X-axis servomotor 19 and Z-axis servomotor 20
Is controlled by the NC device 1.

A female screw portion (not shown) is formed in the portal column 38, and the cross rail 37 is moved up and down by rotating a ball screw 32a screwed into the female screw portion by a cross rail elevating motor 32. The cutting tool T can be replaced with various tools by an automatic tool changer (ATC) 39.

Attachment 50 is attached to the tip of ram 45.
Is attached, and this attachment 50 is replaceable with various attachments. Attachment exchange is performed by an automatic exchange device (AAC) 40. In the attachment 50, for example, depending on the shape of the workpiece, the orientation of the processing surface, the limitation on the diameter of the tool to be used, and the like,
Various attachments such as a standard snout type, a featured snout type, a 30 ° head type, an angle head type, a five-side processing head type, and an index head type are used.

[0008]

By the way, the above 3)
0 ° head type, angle head type, 5 side processing head type,
In the case of an attachment 50 such as an index head type, the attachment
There is known an apparatus provided with an indexing function for determining 0 as a rotation position around an axis (C axis) of the ram 45. The rotation position of the attachment 50 with respect to the ram 45 is determined by, for example, moving the attachment 50 rotatably provided to the ram 45 via a coupling with respect to the ram 45 in the C-axis direction. The coupling is released, and the attachment 50 is instead connected to a main shaft for rotating a tool as a drive shaft, rotated to a desired rotational position by the rotation of the main shaft, and connected again by coupling.

It is necessary to supply lubricating oil, coolant, air, etc. to the attachment 50 side through the ram 45, and a flow path for supplying these fluids is formed between the ram 45 and the attachment 50. ing. A plurality of sealing members such as O-rings for sealing the flow paths are used for these flow paths, and when the attachment 50 is rotated with respect to the ram 45, these seals are provided between the attachment 50 and the ram 45. Sliding resistance of the seal member occurs. By the way, in the above-described indexing of the attachment 50, when the coupling between the attachment 50 and the main shaft is released when the coupling is coupled again from the state where the coupling is released, the attachment 50 can freely rotate with respect to the ram 45. State. In this state, if the sliding resistance of the seal member is generated, the attachment 50 may be rotated by a small angle due to the sliding resistance of the seal member. When the minimum indexing angle of the attachment 50 is large, for example, 90 degrees, the number of teeth of the coupling is correspondingly small, so that the coupling is coupled at a desired rotational position. On the other hand, for example, when the minimum indexing angle is small, such as 5 degrees or 1 degree, the number of teeth of the coupling is large. In some cases, the rotational position of the attachment 50 cannot be accurately determined without coupling at the position.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide an attachment indexing device capable of preventing occurrence of indexing failure during an indexing operation.

[0011]

According to a first aspect of the present invention, there is provided an attachment indexing device for determining a rotational position of an attachment rotatably mounted on a tip of a ram of a machine tool around an axis of the ram. A coupling having a number of meshing teeth corresponding to a minimum indexing angle of the attachment for coupling and releasing the attachment and the ram by moving the attachment in the axial direction; and the coupling. The drive shaft is coupled to the attachment in response to the release of the drive shaft, and the attachment is rotated in the axial direction to determine the drive shaft, and the coupling is coupled to the drive shaft when the coupling shifts from the released state to the coupled state. Before the attachment is released, while restricting the rotation of the attachment around the axis. And an attachment rotation restricting means for guiding the Kijikusen direction.

[0012] The attachment rotation restricting means is provided on one of the attachment or the ram, and circumferentially moves the same number of meshing teeth as the number of meshing teeth of the coupling arranged in correspondence with the respective meshing teeth of the coupling. And a first meshing tooth member provided along the other end of the attachment or the ram. The first engagement tooth member is provided along with a transition from a released state of the attachment and the ram to a coupled state.
And a second meshing tooth member having meshing teeth meshing with at least a part of the meshing tooth member.

[0013] The attachment is provided with a turning part provided to be able to turn around an axis of a predetermined turning axis with respect to the attachment main body, and the attachment body and the turning part are moved by moving the turning part in the turning axis direction. A second coupling having a number of meshing teeth corresponding to the minimum indexing angle of the turning portion for coupling and releasing the turning portion, and constraining the turning position of the turning portion which is indexed when the second coupling is released. The pivoting shaft while restricting the pivoting of the pivoting portion before the restraint of the pivoting portion by the clamping means is released when the second coupling shifts from the released state to the coupled state. Turning guide means for guiding in the axial direction of.

The turning restricting and guiding means is provided on one of the turning shaft and the attachment main body.
A first meshing tooth member having the same number of meshing teeth along the circumference as the number of meshing teeth of the coupling arranged in association with each meshing tooth of the coupling, and the other of the pivot shaft and the attachment body And a second meshing tooth member having meshing teeth meshing with at least a part of the first meshing tooth member as the attachment and the ram transition from the released state to the coupled state.

An attachment indexing device according to a second aspect of the present invention is an indexing device for determining a turning position of a turning portion provided to be able to turn around a predetermined turning axis of an attachment mounted on a tip of a ram of a machine tool. A drive shaft that is provided in the ram and is releasably coupled to the turning shaft, and is configured to rotate the turning shaft; and by moving the turning portion in the turning axis direction, the attachment body and the A coupling having a number of meshing teeth corresponding to the minimum indexing angle of the turning portion for connecting and releasing the turning portion; and the drive shaft and the turning shaft when the coupling shifts from the released state to the connected state. Turning restricting guide means for restricting the turning of the turning portion and guiding the turning portion in the turning axis direction before the connection with the turning portion is released.

In the present invention, in order to determine the rotational position of the attachment, the attachment is moved in the axial direction of the ram to release the coupling. Thereby, the drive shaft and the attachment are connected. From this state, when the drive shaft is rotated to rotate the attachment to a desired rotation position and the attachment is moved in the axial direction opposite to the above, the attachment is attached before the connection with the drive shaft is released. The rotation around the axis is regulated by the rotation regulating means. Further, the attachment is guided in the axial direction by the attachment rotation restricting means, the coupling with the drive shaft is released, the coupling is coupled, and the indexing of the attachment is completed. As described above, in the present invention, rotation around the axis is regulated by the rotation regulating means before the connection between the attachment and the drive shaft is released, and since the rotation is regulated and guided in the axial direction, Even if the index minimum angle of the coupling is reduced, indexing failure does not occur.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of an attachment to which the attachment indexing device of the present invention is applied. Attachment 71 shown in FIG.
Is a so-called index attachment, which is attached to the tip of the ram 61. Attachment 71
Can determine the rotational position about the C-axis, which is the axis of the ram 61, and the attachment 71
The tool holding unit 100 is provided as a swivel unit according to the present invention, which can swivel around a B axis orthogonal to the C axis. The tool holding unit 100 holds the cutting tool T, and is capable of determining a rotational position around the B axis.

The tool T mounted on the tool holder 100 is
The rotation of the main shaft as the drive shaft of the present invention, which is driven by the main shaft motor built in the ram 61, is transmitted to rotate. The mechanism for transmitting the rotational force from the spindle to the tool T is a well-known technique, and a detailed description thereof will be omitted.

FIG. 2 is a view showing a first embodiment of the attachment indexing device according to the present invention, and is a cross-sectional view showing the structure of the indexing device for indexing the attachment 71 shown in FIG. 1 around the C axis. It is. The indexing device 60 shown in FIG. 2 includes a main shaft 72 disposed in a cavity in the ram 61.
A coupling / release member 78 inserted into the main shaft 72 and fixed to a part of the attachment 71; a carvic coupling 62 coupling the attachment 71 with the ram 61;
An engaging tooth member 81 provided on an outer peripheral portion of the ram 61 and an engaging tooth member 82 provided on an outer peripheral portion of the attachment 71 are provided.

The ram 61 is made of, for example, a square member, and the inner peripheral surface 61a is circular. Also, ram 61
Has a built-in spindle motor (not shown).

The main shaft 72 is provided along the C axis which is the center axis of the ram 61, and is driven to rotate by the main shaft motor. An even number of teeth 73 are formed at regular intervals along the circumferential direction on the shaft of the main shaft 72, and the teeth 73 are parallel. Note that the main shaft 72 is connected to the above-described tool T so as to be able to be coupled and released by a transmission mechanism (not shown), and the rotation of the main shaft 72 rotates the tool T.

The coupling / release member 78 is a cylindrical member, and has a main shaft 72 inserted into a hole 78a on the upper end side, and is movable in the C-axis direction. A plurality of grooves 74 that mesh with the teeth 73 formed on the main shaft 72 are formed on the inner peripheral surface of the hole 78a. This groove 74
Is engaged with the tooth portion 73 of the main shaft 72 by the movement of the coupling / release member 78 in the direction of arrow D2 along the C axis, and the arrow D
The meshing is released by the movement in one direction, and the groove 74 of the coupling / release member 78 and the teeth 73 of the main shaft 72 constitute a spline.

The flange 78b at the lower end of the coupling / release member 78 is connected to the attachment 71 by fastening means such as a bolt. Accordingly, the attachment 71 also moves in accordance with the movement of the coupling / release member 78 in the directions of the arrows D1 and D2.

A plurality of seal members, for example, O-rings 75 are interposed between the outer peripheral surface 78c of the coupling / release member 78 and the inner peripheral surface 61a of the ram 61. 78c is slidable with respect to the O-ring 75.

The O-ring 75 seals a flow path for supplying a fluid such as lubricating oil, coolant, or air from the ram 61 side to the attachment 71 side.

The carvic coupling 62 is composed of two ring-shaped members 62a and 62b, one of which is fixed to the attachment 71,
The other ring-shaped member 62b is fixed to the ram 61 side. On one of the opposing surfaces of these two ring-shaped members 62a and 62b, there are formed convex teeth (convex teeth) which are the number of meshing teeth corresponding to the minimum index angle of the attachment 71 around the C axis, and on the other side. Are formed with concave teeth (concave teeth) that mesh with the convex teeth.
For example, when the minimum indexing angle of the attachment 71 about the C axis is 5 degrees, 72 concave teeth and convex teeth are formed respectively, and when the minimum indexing angle is 1 degree, 360 concave teeth and Each convex tooth is formed. High rigidity and automatic alignment can be obtained by such contact between the concave teeth and the convex teeth on all the tooth surfaces.

FIG. 3 is a view showing the positional relationship between the meshing tooth member 81 and the meshing tooth member 82, as viewed from the ram 61 side. As shown in FIG. 3, the meshing tooth member 82
It is made of a ring-shaped member, and is fitted and fixed to the outer periphery of the attachment 71. In the meshing tooth member 82, the same number of meshing teeth 82a as the meshing teeth formed on the above-mentioned carvic coupling 62 are formed at positions corresponding to the respective meshing teeth of the carvic coupling 62 on the outer periphery. Further, the meshing teeth 82a of the meshing tooth member 82 extend linearly along the C axis.

The meshing tooth member 81 is fixed to the outer periphery of the ram 61 by a fixing member 80, and is arranged at a position symmetrical with respect to the C axis. The meshing tooth member 81 includes a plurality of, for example, three meshing teeth 81a that can mesh with a part of the meshing teeth 82a of the meshing tooth member 82.

Next, an example of the operation of indexing the attachment 71 by the indexing device 60 of the above configuration will be described. In the attachment indexing device 60 in FIG. 2, the engagement teeth of the ring-shaped members 62a and 62b of the carbic coupling 62 are engaged with each other, and the attachment 71 and the ram 61 are connected. In addition, the meshing teeth 82a of the meshing tooth member 82 and the meshing teeth 81a of the meshing tooth member 81 mesh with each other. In this state, the rotation of the attachment 71 about the C axis is restricted. From this state, the coupling / release member 78 is moved in the direction of arrow D2. Arrow D of coupling / release member 78
The movement in the direction 2 is performed by driving means (not shown), for example, a hydraulic cylinder.

When the connecting / disconnecting member 78 moves in the direction of arrow D2, as shown in FIG. 4, the connected state of the carbic coupling 62 is released, and the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth member 82 The meshing of 81 with the meshing teeth 81a is also released. Thereby, the attachment 71 can rotate around the C axis. At the same time, the teeth 73 formed on the main shaft 72 and the groove 74 formed on the coupling / release member 78 are engaged with each other, so that the attachment 71 can be rotated by the main shaft 72.

From this state, the main shaft 72 is rotated to a predetermined angle, that is, a rotation position at which the attachment 71 is to be indexed. When the main shaft 72 is rotated, the coupling / release member 7 is rotated.
8 rotates while sliding with respect to the O-ring 75,
A sliding resistance acts on the outer peripheral surface 78c of the release member 78 from the O-ring 75.

When the main shaft 72 is rotated to a predetermined indexing position, the coupling / release member 78 is moved by the hydraulic cylinder in the direction of arrow D1, that is, the Carvic coupling 62.
Is moved in the direction to be combined. When the coupling / release member 78 is moved in the direction of arrow D1, the meshing state between the teeth 73 formed on the main shaft 72 and the groove 74 formed on the coupling / release member 78 is maintained, that is, the main shaft 72.
And the attachment 71 are connected,
The release member 78 does not rotate due to the action of the sliding resistance from the O-ring 75.

By moving the coupling / release member 78 in the direction of the arrow D1, first, the meshing teeth 82a of the meshing tooth member 82 and the meshing teeth 81a of the meshing tooth member 81 mesh. Thereby, the teeth 73 formed on the main shaft 72 and the coupling / release members 7
Even when the engagement state with the groove 74 formed in the groove 8 is released, the coupling / release member 78 does not rotate due to the sliding resistance from the O-ring 75.

When the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth 81a of the meshing tooth member 81 mesh with each other, the meshing tooth member 82
Are formed along the C-axis, so that the coupling / release member 78 is guided along the C-axis in a state where rotation is restricted.

When the connection / release member 78 is further moved in the direction of the arrow D1, the teeth 73 formed on the main shaft 72 are moved.
The meshing state between the groove and the groove 74 formed in the coupling / release member 78 is released.

When the coupling / release member 78 reaches a predetermined position in the direction of the arrow D1, the two ring-shaped members 62a and 62b of the carvicic coupling 62 come into contact and mesh with each other.

As described above, according to the present embodiment, when the attachment 71 is rotated to a desired rotation position and then the coupling 62 is connected to determine the indexing position, the teeth formed on the main shaft 72 are determined. Portion 73 and coupling / release member 7
Before the meshing state with the groove 74 formed in the gear 8 is released, the meshing teeth 82a of the meshing tooth member 82 and the meshing tooth member 81
The rotation of the attachment 71 is regulated by meshing with the meshing teeth 81a of the
Are guided in the C-axis direction, so that the coupling 62 can be securely coupled at a desired indexing position. As a result, even if the minimum indexing angle of the coupling 62 is reduced to, for example, 1 degree, the attachment 71
Can be prevented from being generated around the C axis.

FIG. 5 is a view showing a first embodiment of the attachment indexing device according to the present invention, and is a cross-sectional view showing the structure of the indexing device for indexing the attachment 71 shown in FIG. 1 around the B axis. It is. An attachment indexing device 90 shown in FIG. 5 includes a turning shaft 91 provided along the B-axis of the attachment 71 and rotatably held by the attachment 71, a tool holding unit 100 fixed to the turning shaft 91, Carbic coupling 92 for connecting attachment 71 and tool holder 100
And a rotation regulating guide mechanism 111 provided on one shaft end side of the rotation shaft 91. The turning restriction guide mechanism 111 corresponds to a specific example of the turning restriction guide means of the present invention.

The turning shaft 91 is arranged in a direction orthogonal to the main shaft 72, and is connected to the main shaft 72 by a transmission means such as a bevel gear. Also, the pivot 9
1 is held so as to be movable in the directions of arrows E1 and E2 shown in FIG. 5, and when the turning shaft 91 moves in the direction of the arrow E1, the turning shaft 91 and the main shaft 72 are connected to each other. The turning shaft 91 also rotates. The movement of the turning shaft 91 in the directions of the arrows E1 and E2 is performed by a hydraulic cylinder (not shown). On the other hand, the turning axis 91 is indicated by an arrow E2.
When moved in the direction, the turning shaft 91 and the main shaft 72 are released,
Instead, the tool T and the main shaft 72 are connected.

The Carvic coupling 92 comprises two ring members 92a and 92b, like the Carvic coupling 62 described above. One of the ring members 92a is fixed to the tool holder 100, and the other is the other. The ring-shaped member 92b is fixed to the attachment 71. On one of the opposing surfaces of these two ring-shaped members 92a and 92b, convex teeth (convex teeth), which are the number of meshing teeth corresponding to the minimum index angle of the tool holding portion 100 around the B axis, are formed. On the other side, concave teeth (concave teeth) meshing with the convex teeth are formed.
For example, when the minimum indexing angle about the B axis of the tool holding unit 100 is 5 degrees, 72 concave teeth and convex teeth are respectively formed, and when the minimum indexing angle is 1 degree, 360 concave teeth are formed. Teeth and convex teeth are each formed.

When the carbic coupling 92 shifts from the disengaged state to the coupled state, the rotation restricting guide mechanism 111 rotates the tool holder 100 before the coupling between the pivot shaft 91 and the main shaft 72 is released. It is guided in the B-axis direction while regulating. Here, FIG. 6 is a cross-sectional view illustrating a specific structure of the turning restriction guide mechanism 111, and FIG. 7 is a view illustrating a structure of the turning restriction guide mechanism 111 viewed from the direction of arrow A in FIG. 6 and 7, the turning regulation guide mechanism 11
1 is a meshing tooth member 115 fitted and fixed to a shaft end protruding outside the attachment 71 of the pivot shaft 91;
Contact member 1 fitted and fixed further to the shaft end side of pivot shaft 91
20, a limit switch 150 for checking the clamp and a limit switch 160 for checking the unclamping fixed to the outer surface of the attachment 71, respectively, and provided on the outer surface of the attachment 71 so as to surround the shaft end of the turning shaft 91. And a meshing tooth member 130.

The meshing tooth member 115 is a rotating body centered on the axis of the turning shaft 91, and has the same number of meshing teeth 115a as the meshing teeth of the above-mentioned carbic coupling 92 along the outer circumference. These meshing teeth 115 a are formed along the B-axis direction, and are formed at positions corresponding to the meshing teeth of the carbic coupling 92.

The contact member 120 is a disk-shaped member centered on the axis of the turning shaft 91, and has inclined surfaces 120a and 120a, which are inclined at predetermined angles in opposite directions to the outer peripheral surface.
20b.

Limit switch 150 for checking the clamp
Is provided with a contact member 151 at the tip, and the contact member 151 can contact the inclined surface 120 b of the contact member 120. Limit switch 1 for checking unclamping
60 has a contact member 161 at the tip, and the contact member 161 can contact the inclined surface 120 a of the contact member 120.

[0045] As shown in FIG.
It is made of an arc-shaped member, and the above-mentioned meshing tooth member 11
5, meshing teeth 130a are formed. The meshing teeth 130a are formed along the B-axis direction.

Next, an example of the indexing operation of the tool holding unit 100 around the B axis by the indexing device 90 having the above configuration will be described. In the state shown in FIG. 5 and the state shown by the solid line in FIG. 6, the carvic coupling 92 is in the coupled state, and the turning shaft 91 and the main shaft 72 are in the released state.
Further, the meshing teeth 130a of the meshing tooth member 130 and the meshing teeth 115a of the meshing tooth member 115 are meshed with each other, so that the rotation of the turning shaft 91 about the B axis is restricted.

In this state, when the turning shaft 91 is moved in the direction of arrow E1 by a hydraulic cylinder (not shown), first, the turning shaft 91 and the main shaft 72 are connected, and the turning shaft 91 is moved in the direction of arrow E1. When moved, the meshing state between the meshing teeth 130a of the meshing tooth member 130 and the meshing teeth 115a of the meshing tooth member 115 is released. Also, the carvic coupling 92 is released. Thereby, the turning shaft 91, that is, the tool holding unit 100 can turn around the B axis. In addition, the movement of the turning shaft 91 in the direction of the arrow E1 causes the contact member 161 of the limit switch 160 for unclamping confirmation and the inclined surface 12 of the contact member 120 to move.
0a comes into contact, and thereby, it is detected that the turning shaft 91 and the main shaft 72 are in a connected state.

When the turning shaft 91 moves to a predetermined position in the direction of the arrow E1 and stops, the main shaft 72 is driven to turn the tool holder 100 to a desired turning position. After turning the tool holding unit 100 to a desired turning position, the turning shaft 9
1 is moved in the direction of arrow E2.

When the swivel shaft 91 moves in the direction of the arrow E2, first, the meshing teeth 130a of the meshing tooth member 130 and the meshing teeth of the meshing tooth member 115 are released before the connected state between the swing shaft 91 and the main shaft 72 is released. 115a mesh with each other. For this reason,
A rotating force acts on the pivot shaft 91 by its own weight of the tool holding unit 100.
The turning of the turning shaft 91 is restricted by the meshing of the meshing teeth 0a with the meshing teeth 115a of the meshing tooth member 115.

When the turning shaft 91 further moves in the direction of the arrow E2, the tool holding unit 100 moves the meshing teeth 130a and the meshing teeth 1
B in a state where turning is restricted by engagement with 15a
It is guided in the axial direction, and the connected state of the turning shaft 91 and the main shaft 72 is released.

Further, when the turning shaft 91 further moves in the direction of the arrow E2, the Carbic coupling 92 is connected, and the indexing around the B axis is completed. In addition, the turning shaft 91
In the direction of arrow E2, the contact member 151 and the contact member 1 of the clamp confirmation limit switch 150 are moved.
Thus, it is detected that the turning shaft 91 and the main shaft 72 are in a connected state.

As described above, according to the present embodiment, after the tool holder 100 is rotated to the desired turning position, when the coupling 92 is connected to determine the indexing position,
Before the connected state of the main shaft 72 and the turning shaft 91 is released,
The meshing tooth 130a of the meshing tooth member 130 and the meshing tooth member 115
By interlocking with the meshing teeth 115a, the turning of the tool holding unit 100 due to its own weight is regulated, and the tool holding unit 100 is guided in the B-axis direction by these. Can be combined. As a result, even if the minimum indexing angle of the coupling 92 is reduced, for example, to 1 degree, it is possible to prevent the indexing failure of the tool holding unit 100 around the B axis from occurring.

The present invention is not limited to the above embodiment. In the above-described embodiment, the meshing tooth member 82 is provided on the attachment 71 side, and the meshing tooth member 81 is provided on the ram 61 side. However, the arrangement may be reversed. Further, the meshing teeth 81a of the meshing tooth member 81 are provided not in a ring shape but in pieces, but may be formed in a ring shape. Further, in the above-described embodiment, the case where the present invention is applied to the attachment of the type shown in FIG. 1 has been described. However, application to other types of attachment is naturally possible.

[0054]

According to the present invention, it is possible to prevent the occurrence of indexing failure during the indexing operation of the attachment mounted on the tip of the ram of the machine tool, and to reduce the accuracy of the minimum indexing angle of the attachment and the turning part. A good index can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an attachment to which an attachment indexing device of the present invention is applied.

FIG. 2 is a cross-sectional view illustrating a configuration of an indexing device that performs indexing around a C axis.

FIG. 3 is a diagram showing a positional relationship between a meshing tooth member 81 and a meshing tooth member 82;

FIG. 4 is a cross-sectional view for explaining the operation of an indexing device that performs indexing around the C axis.

FIG. 5 is a cross-sectional view illustrating a configuration of an indexing device that performs indexing around a B axis.

FIG. 6 is a sectional view showing a specific structure of a turning restriction guide mechanism in the indexing device of FIG. 6;

FIG. 7 is a view showing the structure of a turning regulation guide mechanism as viewed from the direction of arrow A in FIG. 5;

FIG. 8 is a configuration diagram illustrating an example of a machining center.

[Explanation of symbols]

 60, 90 ... Indexing device 61 ... Ram 62 ... Carvic coupling 71 ... Attachment 72 ... Drive shaft 73 ... Teeth 74 ... Groove 75 ... O-ring 78 ... Coupling / release member 80 ... Fixing member 82 ... Meshing tooth member 82a ... Meshing tooth 81 ... Meshing tooth member 81a ... Meshing tooth 91 ... Rotating shaft 92 ... Carbic coupling 100 ... Tool holder 111 ... Rotation restricting guide mechanism part 115 ... Mating tooth member 115a ... Mating tooth 120 ... Contact member 130 ... Mating tooth Member 130a: meshing tooth 150: limit switch for checking clamp 160: limit switch for checking unclamping

Claims (6)

[Claims] 1. An attachment indexing device for determining a rotational position of an attachment rotatably mounted on an end of a ram of a machine tool around an axis of the ram, wherein the attachment is moved by moving the attachment in the axial direction. A coupling having a number of meshing teeth corresponding to a minimum indexing angle of the attachment for coupling and releasing the ram, and coupling the coupling with the attachment in accordance with the release of the coupling, and rotating the attachment in the axial direction. A drive shaft to be indexed, and when the coupling shifts from the released state to the coupled state, while restricting rotation of the attachment around the axis before the coupling between the attachment and the drive shaft is released. Attachment rotation restricting means for guiding in the axial direction Indexing device. 2. The attachment rotation restricting means is provided on one of the attachment and the ram, and is provided with the same number of meshing teeth as the number of meshing teeth of the coupling arranged in correspondence with the respective meshing teeth of the coupling. A first meshing tooth member along the circumference, provided on the other of the attachment or the ram,
An attachment indexing device comprising: a second meshing tooth member having meshing teeth meshing with at least a part of the first meshing tooth member as the attachment and the ram transition from a released state to a coupled state. 3. The turning unit is provided so as to be connected to and releasable from the drive shaft, and is provided so as to turn around a turning shaft rotated by the drive shaft; and the turning shaft of the turning unit. A second coupling having a number of meshing teeth corresponding to a minimum indexing angle of the turning portion for connecting and releasing the attachment main body and the turning portion by moving in the direction, and releasing the second coupling. When the state shifts from the state to the coupled state, before the coupling between the pivot and the drive shaft is released, the pivot control means guides the pivot in the pivot axis direction while regulating the pivot of the pivot portion. Item 3. The attachment indexing device according to Item 1 or 2. 4. The turning regulation guide means is provided on one of the turning shaft and the attachment main body, and is provided on the second shaft.
A third meshing tooth member having the same number of meshing teeth along the circumference as the number of meshing teeth of the coupling arranged in association with each meshing tooth of the coupling, and the other of the pivot shaft and the attachment body And a fourth meshing tooth member having meshing teeth meshing with at least a part of the first meshing tooth member as the attachment and the ram transition from a released state to a coupled state. Item 4. An attachment indexing device according to Item 3. 5. An indexing device for determining a turning position of a turning portion provided so as to be able to turn around a predetermined turning axis of an attachment mounted on a tip of a ram of a machine tool, wherein the turning shaft is built in the ram. A drive shaft that is provided so as to be coupled to and releasable from, and rotates the pivot axis; and a movement of the pivot section in the pivot axis direction couples and releases the attachment body and the pivot section. A coupling having a number of meshing teeth corresponding to the indexing angle; and when the coupling shifts from the released state to the coupled state, before the coupling between the drive shaft and the pivot is released, An attachment indexing device having turning control means for guiding in the turning axis direction while restricting turning. 6. The turning regulating guide means is provided on one of the turning shaft and the attachment main body, and has the same number of meshing teeth as the number of meshing teeth of the coupling arranged in correspondence with the respective meshing teeth of the coupling. A meshed tooth member provided along the circumference of the circumference, and the meshed tooth member is provided on the other of the pivot and the attachment body, and transitions from a released state of the attachment and the ram to a coupled state. The attachment indexing device according to claim 5, further comprising: a meshing tooth member meshing with at least a part of the attachment.