JPH11170103A - Lathe tool rest equipped with tool rotation drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lathe tool rest, for surely engaging and connecting the rotation spindle of a tool holder and the rotation drive spindle of a tool rotation drive device, when the tool holder is divided on a working position. SOLUTION: A rotation drive spindle 41 and a rotation spindle are connected by providing: a tool holder 30, a tool rotation drive device 40, an engaging groove 43b on one end of the spindle 41, and an engaging tooth 32a on one end of a rotation spindle; to engage with tooth 32a with the groove 43b. A ring-like guide groove 61 is provided on a tool rest main body 10, also a movement mechanism, for reciprocatively moving the spindle 41 in an axial direction, and a dividing mechanism for the spindle 41 are provided. The spindle 41 and the rotation spindle are divided at a fixed angle and stopped by the dividing mechanism to drive the mechanism 65 to engage/disengage the tooth 32a and the groove 43b, and also the tooth 32a of the rotation spindle is guided by the groove 61 to prevent the rotation of the rotation spindle during the rotation of the holder 30 following the rotation of a turret.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool rest of a lathe capable of performing a milling process, and more particularly, to a tool rotation driving device capable of mounting a rotary tool on a turret and rotating the mounted rotary tool. It relates to a lathe tool post provided.

[0002]

2. Description of the Related Art When performing a plurality of types of processing on a workpiece, such as turning of an outer peripheral surface of a workpiece (hereinafter, referred to as "work"), planar processing or drilling of the outer peripheral surface, the efficiency of processing is reduced by 1%. A multi-tasking type lathe capable of performing a plurality of types of machining by chucking has been used conventionally. This combined machining type lathe is provided so that a rotary tool can be mounted on a turret of a tool rest, and has a tool rotating device for rotating the mounted rotary tool. FIG. 5 shows a tool rest according to a specific example of the combined machining type lathe.

As shown in FIG. 1, the tool rest 1 includes a tool rest main body 10, a turret 25 rotatably held by the tool rest main body 10, a tool holder 30 detachably supported by the turret 25, and Tool 38 held in tool holder 30
And a tool rotation drive unit 40 for rotating the tool.

The turret 25 is made of a member having a polygonal column shape, and a tool holder 30 can be mounted on an outer peripheral surface 28 and a front end surface 29a. There are two types of tool holders 30: one that holds the tool 38 fixedly and the other that holds the tool 38 rotatably. The latter tool holder 30 that holds the rotating tool is shown in FIG.
As shown in FIG. 7, the turret 25 is mounted in a mounting hole 26 penetrating from the front end face 29a to the rear end face 29b.

As shown in FIG. 6, the latter tool holder 30 has a holding portion 37 for holding a tool 38 at one end and a rotating shaft 32 having an engagement tooth 32a at the other end, a bearing 33 and a bearing 33. A holder main body 31 rotatably supporting the rotary shaft 32 via a support 34, and a front cover 35 and a rear cover 36 for sealing the front and rear ends of the holder main body 31. By rotating about the center, the tool 38 held by the holding section 37 also rotates about the axis. The tool holder 30 for holding the rotating tool is provided with a rotating shaft 32 in addition to the holding unit 3.
7 (output side) and two rotation shafts 32 on the engagement tooth 32a side (input side), and these are provided so as to be orthogonal to each other, and these two rotation shafts 32 are connected by a bevel gear, In some cases, the rotation of the input-side rotation shaft 32 causes the rotation of the output-side rotation shaft 32 and the tool 38 held by the holder 37.

As shown in FIG. 5, the rear end face 29b of the turret 25 has a spline ring 18 having internal splines 18a, and an index gear 21 having teeth on the end face.
Is fixed, and the rear end of the turret 25 is externally fitted to the front end of the housing 11 described later.

[0007] As shown in FIG.
Are a housing 11, a cylinder 15 provided at a center position of the housing 11, a piston 14 inserted into the cylinder 15, and an index drive shaft 12 inserted through the piston 14.
And an index gear 20 provided on the front end surface of the housing 11.

The index drive shaft 12 has one end fastened to the turret 25 by a nut 19 and a gear 13 at the other end. Further, the index drive shaft 12 is provided with splines 12 a of external teeth, and the splines 12 a correspond to splines 18 of the spline ring 18.
a.

The gear 13 is connected to an index drive motor (not shown) having an encoder via a transmission gear (not shown), and the index drive motor (not shown) receives a signal from the encoder. The operation is controlled by a control device (not shown) that controls by inputting an input.
When the gear 13 is rotated by being driven by the index drive motor (not shown), the index drive shaft 12 rotates in the same direction, and the spline 12a of the index drive shaft 12 and the spline 18a of the spline ring 18 are rotated. The turret 25 is rotated in the same direction via the spline ring 18 due to the meshing relationship with. And the control device (not shown)
Controls the rotation angle of the turret 25, whereby the turret 25 can be indexed to a desired angle.

The piston 14 is moved by an oil pressure as indicated by an arrow A-.
It is inserted into the cylinder 15 so as to be movable in the direction B.
A pushing ring 17 is externally fitted to the index drive shaft 12 between the piston 14 and the spline ring 18. When the piston 14 is urged in the direction of arrow A by hydraulic pressure, the pushing ring 17 The turret 25 is urged in the direction of arrow A via the spline ring 17 and the spline ring 18 and moves in the same direction. The end of the cylinder 15 in the A direction is sealed by a cylinder lid 16.

As described above, the indexing gear 20 having teeth on the end face is provided on the front end face 11a of the housing 11, and this meshes with the indexing gear 21 mutually.

As shown in FIG. 5, the tool rotation drive unit 40 includes a drive shaft 42 rotatably supported by the housing 11 by a bearing 45, and a drive shaft 42.
A rotation drive shaft 41 including an engagement shaft 43 inserted therein,
A tool drive motor (not shown) for rotating the drive shaft 42 about the axis;

A pulley 47 and a drive belt 46 wound around the pulley 47 are provided at the rear end (the end in the direction of arrow B) of the drive shaft 42. The drive belt 46 is connected to the tool drive motor. (Not shown), whereby the drive shaft 42 rotates about the axis. The spline 4 of the internal teeth is provided on the inner diameter of the drive shaft 42.
2a is provided so that splines 43a of external teeth provided on the outer peripheral portion of the engagement shaft 43 and the splines 42a mesh with each other so that the drive shaft 42 and the engagement shaft 43 rotate integrally. Has become.

An engagement groove 43b is provided on the end surface of the engagement shaft 43 in the direction of arrow A, and the engagement shaft 43 is provided with a spring 44.
And the engaging teeth 32 a of the tool holder 30 indexed to the machining position and the engaging grooves 4.
3b mesh with each other. A dog 51 and a proximity switch 50 for detecting the dog 51 are provided at the rearmost end of the drive shaft 42. The engagement between the engagement teeth 32a and the engagement grooves 43b is performed by the proximity switch 50 and the dog 51. The state can be detected.

According to the tool rest 1 having the above structure, first, the hydraulic pressure is supplied into the cylinder 15 to move the piston 14 in the direction of arrow A. As a result, the turret 25 moves in the direction indicated by the arrow A, the meshing relationship between the index gear 20 and the index gear 21, the engagement teeth 32a of the tool holder 30, and the engagement shaft 43.
Is disengaged from the engagement groove 43b.

Next, the index drive motor (not shown)
Is driven to rotate the indexing drive shaft 12 and the turret 25 connected thereto, and the tool holder 30 holding a desired tool is rotated.
To the machining position. Here, it is assumed that the tool holder 30 holding the rotary tool shown in FIG. 5 is indexed.

Next, the supply of the hydraulic pressure into the cylinder 15 is switched to move the piston 14 in the direction of arrow B. As a result, the turret 25 moves in the direction indicated by the arrow B, the index gear 20 and the index gear 21 mesh again, and the turret 25 is accurately positioned.

On the other hand, regarding the engaging teeth 32a of the tool holder 30 and the engaging grooves 43b of the engaging shaft 43, if the angular relationship between the engaging teeth 32a and the engaging grooves 43b is at an angle that matches each other, a turret is used. With the movement of arrow 25 in the direction of arrow B, both the engaging teeth 32a and the engaging grooves 43b mesh with each other, while the angular relationship between the engaging teeth 32a and the engaging grooves 43b is relatively shifted. In this case, as the turret 25 moves in the direction indicated by the arrow B, the rear end surface of the engagement teeth 32a and the front end surface of the engagement shaft 43 come into contact with each other, whereby the engagement shaft 43 receives the urging force of the spring 44. It moves in the direction of arrow B in opposition. FIG. 7 shows a state in which both the engagement teeth 32a and the engagement grooves 43b are meshed with each other.

Next, when the tool drive motor (not shown) is driven to rotate the drive shaft 42, the engagement shaft 43 is rotated by this, and the engagement teeth 32a and the engagement grooves 43b are already engaged. If it is, the tool 38 held by the tool holder 30 is rotated by the rotation of the engagement shaft 43. On the other hand, when the engagement teeth 32a are not engaged with the engagement grooves 43b, the rotation of the engagement shaft 43 causes the engagement teeth 32a and the engagement grooves
3b coincides with each other when the angles coincide with each other, and thereafter, the tool 3 held in the tool holder 30 by the rotation of the engagement shaft 43.
8 rotates. When the engagement switch 32 is engaged with the engagement groove 43b, the proximity switch 50 detects the dog 51. As a result, it is determined that the engagement tooth 32a is engaged with the engagement groove 43b. 50.

According to the tool rest 1, the desired tool 38 mounted on the turret 25 can be indexed to the machining position as described above. If the indexed tool 38 is a rotary tool, it is rotated. Can be done.

The engagement relationship between the rotation shaft 32 of the tool holder 30 and the engagement shaft 43 is such that when the turret 25 rotates, the engagement relationship between the two is released, and when the turret 25 moves in the direction of arrow B, the engagement between the two. Suffices to be provided so as to engage. Therefore, as shown in FIG.
On the other hand, the engaging shaft 43 is provided with engaging teeth 43c, and the engaging groove 32b is engaged with the engaging teeth 43c so that the rotating shaft 32 and the engaging shaft 43 are engaged. There is also.

[0022]

However, as described above, in the conventional tool rest 1, when the tool holder 30 is indexed to the machining position, the engaging teeth 32a of the tool holder 30 are not used.
When the angle between the engagement shaft 43 and the engagement groove 43b does not coincide with each other, the front end surface of the engagement shaft 43 is brought into contact with the rear end surface of the engagement teeth 32a by the urging force of the spring 44. By driving a drive motor (not shown) and rotating the engagement shaft 43, the contact surfaces between the engagement teeth 32a and the engagement grooves 43b are slid with each other, and the two are brought into engagement at the same angle. Because of the structure, if the sliding state of the contact surfaces is poor, that is, if the contact surfaces do not slide well, the engaging teeth 32a and the engaging grooves 43b are not engaged with each other (unconnected). As a result, both are rotated. As a result, when the workpiece is machined by the tool 38, there is a problem that the tool 38 is damaged due to poor rotation of the tool 38, or the workpiece and the machine tool itself are damaged.

As a matter of course, if the tool rest 1 is used for a long time, the engaging teeth 32a and the engaging grooves 43
The contact surface with b is roughened by sliding, and the contact surface becomes more and more difficult to slip, and the above-mentioned problem frequently occurs.

The present invention has been made in view of the above circumstances, and when the tool holder is indexed to the machining position, the rotation axis of the tool holder and the rotation drive axis of the tool rotation drive device are reliably connected. An object of the present invention is to provide a lathe tool post that can be engaged and connected.

[0025]

According to the present invention, there is provided a tool holder for rotatably holding a tool, having a rotating shaft, and rotating the held tool by the rotating shaft. A turret for detachably holding the tool holder, a turret main body for rotatably holding the turret, rotating the turret to index each tool holder mounted on the turret to a processing position, and a turret main body And a tool rotation drive device provided with a rotation drive shaft, the tool rotation drive device engaging the rotation drive shaft with the rotation shaft of the tool holder indexed to the machining position, and rotating the rotation shaft. A base, wherein an engagement groove or an engagement tooth is provided at an end of the rotary drive shaft, and the engagement tooth or the engagement groove disengaged from the engagement groove or the engagement tooth of the rotary drive shaft is rotated. The rotary drive shaft and the rotary shaft are connected by engaging an engagement groove or an engagement tooth of the rotary drive shaft with an engagement tooth or the engagement groove of the rotary shaft. In the lathe tool post provided, the tool rotation drive device is provided with a moving device groove for reciprocating the rotary drive shaft in the axial direction, and the rotary drive shaft is reciprocated in the axial direction by the movable device groove. , The rotary drive shaft is provided so as to be disengaged from the rotary shaft, and an indexing mechanism for indexing the rotary drive shaft at a fixed angle is provided, while an annular guide groove or guide protrusion is provided on the tool rest body. When the tool holder mounted on the turret rotates together with the turret, the guide shaft or the protrusion is engaged with the engagement teeth or the engagement groove of the rotating shaft to rotate the rotating shaft. It is characterized in that provided so as to prevent the that.

According to the present invention, first, when the machining is finished and the rotation of the rotary tool is stopped, the index of the rotary drive shaft is indexed to a fixed angle by the indexing mechanism of the tool rotary drive. That is, when the turret is rotated in the forward and reverse directions, the rotation drive shaft is set at an angle at which the engagement teeth or engagement grooves of the rotation shaft can engage with the guide grooves or guide protrusions provided on the tool rest body. Find out.

Next, the moving mechanism is driven to retreat the rotary drive shaft in the axial direction, so that the engagement groove or the engagement tooth of the rotation drive shaft and the engagement tooth or the engagement groove of the rotary shaft are moved. After disengagement, the turret is driven to index the next tool to be used at the machining position. According to the present invention, an annular guide groove or guide protrusion is provided on the tool rest main body, so that the tool holder rotates while the turret rotates.
The engaging teeth or the engaging grooves of the rotating shaft are guided by the guide grooves or the guide projections, and the rotating shaft is prevented from rotating around the shaft.

When the tool holder provided with the rotary shaft is again indexed to the machining position, the engaging teeth or the engaging grooves of the rotary shaft are guided by the guide grooves or the guide projections, and the indexing mechanism is already provided. As a result, the rotary drive shaft is guided to the machining position at the same angle as the engagement groove or the engagement tooth of the rotation drive shaft which is calculated at a predetermined angle.

Next, when the moving mechanism is driven to move the rotary drive shaft forward in the axial direction, the engaging groove or the engaging tooth of the rotary drive shaft and the engaging tooth or the engaging groove of the rotary shaft are moved. Mesh with each other to connect the rotation drive shaft and the rotation shaft.

As described above, according to the present invention, when the rotation of the rotary tool is stopped, the angle of the rotary drive shaft is determined to a certain angle by the indexing mechanism, and the tool holder rotates with the rotation of the turret. In the meantime, since the engaging teeth or the engaging grooves of the rotating shaft are guided by the guide grooves or the guide projections to prevent the rotating shaft from rotating around the shaft, the rotating shaft after indexing is formed. And the rotary drive shaft can be reliably connected, and the tool can be reliably rotated. Therefore, the rotary shaft and the rotary drive shaft are not connected to each other, and the conventional problem that the tool is damaged or the workpiece and the machine tool itself are damaged does not occur.

In general, when indexing a turret on a tool post of a lathe, the turret is moved in a direction away from the tool post main body along the rotation center axis of the turret,
There are a lift type in which the turret is rotated and indexed, and a non-lift type in which the turret is indexed by rotating without moving the turret in the same direction. By reciprocating in the axial direction, the rotary drive shaft is configured to be disengaged from the rotary shaft, so that any of the above-mentioned tool rests, the rotary drive shaft and The rotating shaft can be easily and reliably engaged and disengaged. Further, by this, the engagement groove can be deepened and the engagement teeth can be lengthened to make the engagement relationship between the engagement groove and the engagement teeth stronger, and even if a high load is applied to the tool. The connected state between the rotating shaft and the rotating drive shaft can be favorably maintained.

Needless to say, in the present invention, when the rotating shaft is provided with engaging teeth, an engaging groove is provided in the rotating shaft and a guide groove is provided in the tool post main body. When the engaging groove is provided on the rotary shaft, engaging teeth are provided on the rotary shaft and guide protrusions are provided on the tool rest body. Thereby, the above-described operation is achieved.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view showing a tool rest according to the present embodiment in a partial cross section. As shown in the figure, the tool rest 55 according to the present embodiment is provided with a tool groove driving mechanism 40 and an indexing mechanism (not shown) in the tool rotation driving device 40 in the conventional tool rest 1 described above, and a tool rest 55. The guide ring 60 is provided on the main body 10, and other configurations are the same as those of the conventional tool rest 1. Therefore, the same components as those of the conventional tool rest 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 1, the guide ring 60
Is provided on the front end surface 11a of the housing 11,
A guide groove 61 is provided on the end face on the arrow A direction side. FIG.
Is a side view of the guide ring 60 viewed from the direction of arrow C. As shown in the figure, the guide groove 61 is located at a position corresponding to the engagement teeth 32a of the tool holder 30 mounted on the turret 25. An annular groove is provided, and the inner width thereof is a minimum width that allows the engaging teeth 32 a to circulate in the guide groove 61 along the guide groove 61. Further, a through hole 62 is provided at a position corresponding to the rotation drive shaft 41 of the tool rotation drive device 40, and the rotation drive shaft 41 is inserted into the through hole 62.

The moving device groove 65 reciprocates the engaging shaft 43 in the axial direction, and includes a cylinder 66, a piston 67 fitted in the cylinder 66, and a retracting member 71 fixed to the piston 67. An engaging member 72 that engages with the pull-in member 71 and the spring 44 described above.

The cylinder 66 is mounted on the housing 11
Is provided on a mounting bracket 73 fixed to the
The opening is sealed by a cover 68. The cylinder 66 is supplied with hydraulic pressure by a hydraulic pipe 69 and a hydraulic pipe 70. The hydraulic pipe 69 is supplied with the same hydraulic pressure as the hydraulic pressure for moving the piston 14 in the direction of arrow B. The same hydraulic pressure as that for moving the piston 14 in the direction of arrow A is supplied to the pipe 70.

As shown in FIG. 3, the retracting member 71 is fixed to the end of the piston 67, is a member having a substantially U-shaped cross section, and is bent inward at both ends. A hook-shaped engaging portion 71a is formed. The engaging member 72 is a columnar member, and is fixed to the end of the engaging shaft 43 in the direction indicated by the arrow B.
1 and mutually engages with the engaging portion 71a.

In FIG. 1, reference numerals 74, 75, and 77 denote proximity switches. Reference numeral 76 denotes a toothed ring provided with a predetermined number of teeth on the outer periphery and fixed to the end of the drive shaft 42 in the direction of arrow B. is there.

Although the indexing mechanism is not specifically shown, an encoder is provided in the tool driving motor (not shown), and the tool driving motor (not shown) is provided based on a signal from the encoder. ) Can be controlled so that the rotation angle of the drive shaft 42 can be determined to a certain angle.

Next, the operation of the tool rest 55 according to this embodiment having the above-described configuration will be described. The tool post 55
Are assumed to be in the state shown in FIG. 1, and for convenience of explanation, the description will be made assuming that the tool holder 30 at the processing position shown in FIG. 1 is again indexed to the processing position.

First, when the machining using the rotary tool 38 is completed and the rotation of the rotary tool 38 is stopped, the indexing mechanism (not shown) of the tool rotation driving device 40 is operated to operate the drive shaft 42. Calculate the angle at a fixed angle. That is, the angle of the drive shaft 42 is determined so that the angles of the engagement teeth 32a and the engagement grooves 43b match the angles corresponding to the tangents of the guide grooves 61 at the processing positions.

Then, a hydraulic pressure is supplied into the cylinder 15 to move the piston 14 in the direction of arrow A and move the turret 25 in the same direction. On the other hand, the same hydraulic pressure as that for moving the piston 14 in the direction of arrow A is supplied to the cylinder 66 via the hydraulic piping 70 into the cylinder 66, and the hydraulic pressure causes the piston 67 to move in the direction of arrow B.

As a result, the meshing relationship between the index gear 20 and the index gear 21 is released, and the turret 25 can rotate about the axis of the index drive shaft 12. The engagement teeth 32a of the tool holder 30 mounted on the turret 25 are indicated by arrows A.
While the retracting member 71 fixed to the piston 67 is moved in the direction of arrow B, and
is engaged with the engaging member 72, and the engaging shaft 43 is moved in the direction of arrow B against the urging force of the spring 44. As a result, the meshing relationship between the engaging teeth 32a and the engaging grooves 43b is established. Is released. Further, the retracted member 71 after the movement is detected by the proximity switch 74, whereby it is detected that the meshing relationship between the engaging teeth 32a and the engaging grooves 43b is released.

Next, the index drive motor (not shown)
To rotate the index drive shaft 12 and the turret 25 connected thereto. The engaging teeth 32a are previously indexed by the indexing mechanism (not shown) at an angle corresponding to the tangent of the guide groove 61 at the processing position. Tooth 32a
Is inserted into the guide groove 61 of the guide ring 60, and then goes around the guide groove 61 along the guide groove 61. As described above, since the inner width of the guide groove 61 is the minimum width that allows the engagement teeth 32a to circulate along the guide groove 61, the engagement teeth 32a are always formed by the guide grooves 61. The posture is regulated so as to have an angle corresponding to the tangent of.

Next, the tool holder 30 is indexed to the machining position. At this time, the engaging teeth 32a are guided to the machining position at an angle substantially corresponding to the tangent of the guide groove 61 at the machining position.

Next, the supply of oil pressure to the cylinder 15 is switched to move the piston 14 in the direction of arrow B and move the turret 25 in the same direction. On the other hand, the same oil pressure as the oil pressure for moving the piston 14 in the direction of arrow B is supplied to the cylinder 66 via the hydraulic pipe 69 to the cylinder 66, and the oil pressure causes the piston 67 to move in the direction of arrow A.

Thus, the index gear 20 and the index gear 21 are meshed again, and the turret 25 is accurately positioned. Also, while the engaging teeth 32a of the tool holder 30 mounted on the turret 25 move in the direction of arrow B, the piston 6
7 is displaced in the direction of arrow A to disengage the engaging portion 71a from the engaging member 72, and is engaged by the urging force of the spring 44 in the direction of arrow A. The joint shaft 43 is moved in the direction of arrow A. As described above, the engaging groove 43b of the engaging shaft 43 is previously set in the guide groove 61 at the processing position by an indexing mechanism (not shown).
And the engaging teeth 32a are also guided to the machining position at the same angle, so that the engaging teeth 32a
Moves in the direction of arrow B, and the engaging shaft 43 moves in the direction of arrow A, whereby the engaging teeth 32a and the engaging grooves 43b are engaged and connected again. Further, with the movement of the retracting member 71 and the engaging member 72 in the direction of arrow A, the detection of the retracting member 71 by the proximity switch 74 is stopped, and the proximity switch 7
5, the engagement member 72 is detected, thereby detecting that the engagement tooth 32a and the engagement groove 43b are engaged.

Next, when a tool drive motor (not shown) is driven to rotate the drive shaft 42, the engagement shaft 43 is rotated, and the tool 38 held in the tool holder 30 is rotated. As a result, the workpiece can be processed by the tool 38.
The tooth ring 76 rotates with the drive shaft 42, and the teeth thereof are intermittently detected by the proximity switch 77, thereby detecting that the drive shaft 42 is rotating.

As described above, according to the tool post 55,
When the rotation of the tool 38 is stopped, the engaging teeth 32a are set at an angle corresponding to the tangent of the guide groove 61 at the processing position.
During the rotation of the tool holder 30 in accordance with the indexing of the turret 25, the engaging teeth 32a are guided by the guide grooves 61, and the angle and the angle corresponding to the tangent of the guide grooves 61 are always determined. The engagement teeth 32a and the engagement grooves 43b are controlled at the machining position by regulating the posture of the engagement teeth 32a so as to guide the engagement teeth 32a to the machining position.
Can be reliably engaged with each other, and the rotating shaft 32 and the engaging shaft 43 can be reliably connected.

Further, in this tool rest 55, since the engaging teeth 32a and the engaging grooves 43b are provided so as to be disengaged by the moving device grooves 65, arrows AB of the turret 25 are shown.
The engagement groove 43b can be made deeper than in the conventional tool rest 1 which is disengaged by moving in the direction, so that the engagement relationship between the engagement teeth 32a and the engagement groove 43b can be improved. Can be stronger. This allows
Even if a high load acts on the tool, the connection between the rotary shaft and the rotary drive shaft can be maintained in a good condition.

In this example, the turret 25 is indicated by an arrow A-
Although the lift type tool rest which moves and is indexed in the direction B has been described, the provision of the moving device groove 65 can easily relate to a non-lift type tool rest which does not move the turret 25 in the directions indicated by arrows AB. The engagement tooth 32a and the engagement groove 43b can be disengaged.

In this embodiment, the piston 14 is indicated by arrows AB.
Each hydraulic pressure operated in the direction and the piston 67 are indicated by arrows B-A.
Direction, the operation of the piston 14, that is, the turret 25, in the direction of arrow AB, and the operation of the piston 67, that is, the arrow B-A of the engagement shaft 43, are common.
Direction operation can be easily synchronized, and a series of operation times can be made as short as possible.

Further, as another embodiment of the present invention, the mode shown in FIG. 4 can be adopted. FIG. 4 shows a guide ring 60, an engagement shaft 43, and a rotation shaft 32 according to another embodiment.
As shown in the figure, the tool rest according to the other embodiment has a guide protrusion 62 provided on the guide ring 60 instead of the guide groove 61, and the engagement groove 43.
The point that the engaging teeth 43c are provided on the engaging shaft 43 instead of the b and the engaging grooves 32b are provided on the rotating shaft 32 instead of the engaging teeth 32a is different from the tool rest 55 of the above example. Is the same as the tool rest 55 in the above example.

According to this tool rest, the engaging shaft 43 and the rotating shaft 32 are connected by the engagement of the engaging teeth 43c of the engaging shaft 43 with the engaging grooves 32b of the rotating shaft 32, so that the guide ring 60 Guide projection 62 and engagement groove 32b of rotary shaft 32
Is engaged, it is possible to control the attitude of the engaging groove 32b while the tool holder 30 rotates.
The same operation and effects as those of the above-mentioned tool rest 55 can be obtained by this tool rest.

Although the embodiments of the present invention have been described in detail, it goes without saying that specific embodiments of the present invention are not limited to these embodiments.

[Brief description of the drawings]

FIG. 1 is a plan view showing a tool rest according to an embodiment of the present invention in a partial cross section.

FIG. 2 is a side view of the guide ring viewed from a direction indicated by an arrow C in FIG.

FIG. 3 is a perspective view showing an engagement relationship between a retraction member and an engagement member.

FIG. 4 is a plan view showing a guide ring, a rotation shaft, and an engagement shaft according to another embodiment of the present invention.

FIG. 5 is a plan view showing a conventional tool rest in a partial cross section.

FIG. 6 is a sectional view showing an example of a tool holder for holding a rotary tool.

FIG. 7 is a perspective view showing an engagement relationship between a rotation shaft and an engagement shaft in a conventional tool rest.

FIG. 8 is a perspective view showing an engagement relationship between a rotation shaft and an engagement shaft in a tool post according to another conventional mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Turret main body 11 Housing 12 Index drive shaft 25 Turret 30 Tool holder 32 Rotary shaft 32a Engagement tooth 38 Tool 40 Tool rotation drive 41 Rotation drive shaft 42 Drive shaft 43 Engagement shaft 43b Engagement groove 55 Turret 60 Guide Ring 61 Guide groove 65 Mobile device groove 66 Cylinder 67 Piston 68 Cover 71 Retraction member 72 Engagement member

Claims (1)

[Claims] 1. A tool holder that rotatably holds a tool, has a rotation shaft, and rotates the held tool by the rotation shaft, a turret that detachably holds the tool holder, and a rotatable turret. A tool rest body for rotating the turret and rotating each tool holder mounted on the turret to a machining position; a tool rest attached to the tool rest body and having a rotary drive shaft for indexing to a machining position. And a tool rotation drive device for rotating the rotation shaft by engaging the rotation drive shaft with the rotation shaft of the tool holder, wherein the end of the rotation drive shaft has an engagement groove or An engagement tooth is provided, and an engagement tooth or an engagement groove that engages with or disengages from the engagement groove or the engagement tooth of the rotation drive shaft is provided at an end of the rotation shaft. With dentures In a lathe tool post provided so as to connect the rotary drive shaft and the rotary shaft by engaging the engagement teeth or the engagement grooves of the rotary shaft, the tool rotary drive device includes the rotary drive shaft. A moving device groove for reciprocating in the axial direction is provided, and the rotational driving shaft is reciprocated in the axial direction by the moving device groove, so that the rotational driving shaft is provided so as to be disengaged from the rotating shaft, While providing an indexing mechanism for indexing the rotary drive shaft at a fixed angle, an annular guide groove or guide protrusion is provided in the tool post main body, and when the tool holder mounted on the turret rotates with the turret, A tool rotary drive provided to engage a guide groove or a guide projection with an engagement tooth or an engagement groove of the rotary shaft to prevent the rotary shaft from rotating. Lathe tool rest was equipped with a device.