JP2002039312A - Swivel axis drive - Google Patents

Abstract

(57) [Problem] To provide a driving device for a turning shaft that has no stop loss at the time of switching between a turning operation and an axial movement operation. SOLUTION: A first motor and a second motor are formed on a rotating shaft, a first rotor is engaged with a rotating shaft and a screw member, and a second rotor is engaged with an axial sliding guide member, so that the rotating shaft is the first rotating shaft.
The rotor is rotated in the axial direction, and only the turning is performed by the synchronous rotation of the first rotor and the second rotor. First motor and second motor
By controlling the rotation of the motor with the control device, the turning shaft can be turned without stopping the operation while being moved in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device capable of obtaining turning and axial movement on one axis.
More specifically, the present invention relates to a field of a function requiring a tool change arm of a machine tool, a center axis of a turret tool rest, and the like.

[0002]

2. Description of the Related Art Conventionally, a drive device for turning a tool changing arm and moving in the direction of a turning axis in a changing arm unit used for an automatic tool changing device of a machine tool, for example, has a function of turning a tool changing arm and inserting and removing a tool. Therefore, in many cases, a servomotor of NC control is separately provided for the movement in the rotation axis direction, and the rotation and the movement in the axial direction are taken out by combining the spline shaft and the gear train. As another conventional technique, for example, Japanese Patent Application Laid-Open No. Hei 8-25763 is known. According to the present invention, the rotation and the movement in the rotation axis direction are taken out by a set of servo motors and an electromagnetic clutch / brake provided side by side on one rotation axis.

In FIG. 3, a servo motor 1 is provided concentrically above a vertical hole 101a of a unit body 101.
02, a ball nut 104 that is rotatably fitted into the hole 101a is concentrically fixed to the lower end of the output shaft 102a.
Further, a female spline 105 is fitted between the ball nut 104 and the hole 101a of the main body so as to be rotatable only, a clutch member 106 is provided between the ball nut 104 and the female spline 105, and a female spline is provided between the female spline and the bottom plate 101b. Are provided with brake members 107 respectively. The center shaft 109 is inserted into the hole between the ball nut 104 and the female spline 105.
Are engaged through. A single servo motor 102 having a rotation angle detector 103 causes the tool change arm 108 to turn and move in the turning axis direction.

[0004]

Since the NC driving device of the tool change arm, which was first described in the prior art, uses two servomotors and a gear train, the number of components required is large and it is difficult to reduce the size and weight. Further, there is a problem that the shaft control mechanism is complicated, resulting in high cost and low reliability. In the case of the invention disclosed in Japanese Patent Application Laid-Open No. 8-25763, a single servomotor is used and an electromagnetic clutch / brake is provided coaxially and the structure is simple. The operation temporarily stops at the time of switching because the electromagnetic brake / clutch is used. For this reason, there is a problem that it is not possible to avoid the generation of the dead time during that time. The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to form two motors coaxially without using an electromagnetic clutch / brake and to provide two motors. It is an object of the present invention to provide a drive device capable of turning and turning in a turning axis direction without stopping during operation by controlling the rotor in an integrated manner.

[0005]

In order to achieve the above object, the present invention provides a driving device for a turning shaft for turning and moving in an axial direction. A first stator coil and a second stator coil, which are mounted in the hole formed in the axial direction, and a first motor which forms the first stator coil and the first motor and has a female screw member in a center hole, and is mounted on the base. A rotor, a second rotor that forms the second stator coil and the second motor, has an axial sliding guide member in a center hole, and is supported by the base, and is screwed with the female screw member of the first rotor A rotating shaft having, on the same axis, a male screw member to be engaged and a shaft member having a shape engageable with the axial sliding guide member of the second rotor, and comprehensive control of rotation of the first motor and the second motor. Control device and It is intended to be applied to the pivot shaft continuously turning and axial movement by comprehensively controlling the rotational speed of the two motors configured on the shaft.

According to the first aspect of the present invention, two rotors are provided on the turning axis, and two stators and two motors provided in the base hole are formed. The first rotor has a turning shaft and a ball. The other rotor is engaged so as to be relatively movable in the direction of the pivot axis of the key material or the spline. As a result, the turning shaft is moved in the axial direction by the rotation of the first rotor by fixing the other rotor. Further, the rotation axis can be turned by synchronizing the rotation of the first rotor with the rotation of the other rotor. By controlling the amount of rotation of both, it is also possible to turn the turning shaft while moving in the axial direction. In this case, since there is no need to temporarily stop the operation between the turning and the axial movement, the turning and the axial movement can be smoothly connected, so that a series of operations can be speeded up.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is a sectional view showing an embodiment applied to a change arm unit used in an automatic tool changer of a machine tool. In FIG. 1, a hole 1a is bored in a base 1, and a first stator coil 2 and a second stator coil 3 are juxtaposed in the hole 1a. The first motor 4 is
The second motor 6 includes the stator coil 2 and the first rotor 5, and the second motor 6 includes the second stator coil 3 and the second rotor 7. The magnet 4a of the first motor 4 is attached to the first rotor 5
The second rotor 7 having the magnet 6 a of the second motor 6 and the exterior thereof is arranged side by side on the axis of the turning shaft 8.

The first rotor 5 is rotatably mounted on a first housing 9 attached to one end of a hole 1a of the base 1. A turning shaft 8 formed in a male screw member, for example, a trapezoidal male screw or a ball screw, is fitted in a female screw member, for example, a trapezoidal female screw or a ball nut provided in the center hole 5a of the first rotor 5.

The second rotor 7 is rotatably mounted on a second housing 10 attached to the other end of the hole 1a of the base 1. A pivot member 8 formed on a shaft member such as a keyed shaft or a spline shaft is fitted into an axial sliding guide member such as a key groove or a hole spline provided in a center hole 7a of the second rotor 7. Therefore, the turning shaft 8 has, on the same axis, a shaft portion provided with a shaft spline engaged with the spline hole 7a and a shaft portion provided with a male screw engaged with the female screw hole 5a on the same axis. In the spline engagement portion 8a, the axial direction is guided by the screw engagement portion 8b,
Accuracy at the time of reversing / turning is maintained. First motor 4,
A first sensor 11 and a second sensor 12, which detect the respective rotation angles of the second motor 6, are provided in the first housing 9 and the second housing 10, respectively, and detect the rotation angles of the first rotor 5 and the second rotor 7, respectively. are doing.

A turning member 13 is provided at the shaft end of the turning shaft 8. The revolving member 13 is a twin-type revolving arm in a tool changing device of a machine tool, and is a revolving axis of a turret tool post in a tool rest. That is, the turning shaft 8 can turn forward and backward in the axial direction and turn on a plane orthogonal to the central axis. Therefore, by arranging the turning axis vertically or horizontally, it can be freely applied to the turning arm or the tool post center axis. First
The motor 4 and the second motor 6 are controlled by a control device capable of controlling rotation independently or in association with each other, and the turning of the turning shaft 8 and the forward and backward movement in the turning axis direction are performed.

Next, the operation of this embodiment will be described. In FIG. 1, the turning of the tool change arm by approximately 90 degrees from the standby position for holding and releasing the tool and the turning of 180 degrees for replacing the next tool and the used tool are performed by the first motor 4 and the second motor. This is possible by simultaneously controlling and rotating the motor 6. Regardless of the screw direction of the screw member in which the first rotor 5 and the rotating shaft 8 are engaged, the turning of the rotating shaft 8 is performed by the second motor 6.
The turning position is determined by the same amount as the rotation direction of the second rotor 7.
At this time, the first rotor 5 may apply the same amount of rotation to the rotation direction of the second rotor 7. If the second rotor 7 is rotated and the first rotor 5 is stopped, the rotation of the second rotor 7 can be turned by the same effect as braking by the screw portion of the first rotor 5. Can not.

Next, when the turning shaft 8 is moved forward or backward, that is, when the tool is inserted or removed, the second motor 6 is stopped, and the first motor 4 is driven while the second rotor 7 is being urged. As the first rotor 5 rotates, the turning shaft 8 is slid and guided by the spline or key engagement portion of the second rotor 7 and the first
Forward or backward movement is performed according to the screw direction of the rotor 5 and the rotation direction of the first rotor 5. For example, when the first rotor 5 is engaged with the turning shaft 8 with a right-hand screw, the turning shaft 8 moves forward when the first rotor 5 rotates left, and moves backward when the first rotor 5 turns right.
The respective rotation speeds of the first motor 4 and the second motor 6 are always detected by the first sensor 11 and the second sensor 12, and the predetermined rotation speed input to the control device is grasped, and the predetermined forward / reverse and turning are performed. Secured.

[Embodiment 2] FIG. 2 is a sectional view of a turret tool rest of a machine tool such as a lathe in which the turning shaft driving device of the present invention is applied. In FIG. 2, the tool post 14
The hole 14a is formed in the hole 1a in the configuration of the first embodiment.
Is the same as A first motor 4 and a second motor 6 are formed in the axial direction of the turning shaft 8, and the first rotor 5 and the second rotor 7 are blades in which a first housing 9 and a second housing 10 bearing the respective components are replaced with the base 1. The swivel shaft 8 is supported by the base 14.

Since the positioning of the turret 15 attached to the shaft end of the turning shaft 8 in the turning direction is performed by meshing the teeth of the carbic coupling 16, the amount of movement in the axial direction is not large. Therefore, it is easy to configure the drive device of the turning shaft in the tool rest 14. When the driving device for a turning shaft according to the present invention is applied to the turret tool rest, the operations related to the turning and the axial movement of the turning shaft 8 are basically the same as those in the first embodiment, and a description thereof will be omitted.

Further, as another application of the present invention which is different from the first and second embodiments, the present invention can be applied to a main shaft. That is, by rotating the first motor 4 and the second motor 6 equally,
And a Z axis control of the headstock by moving the spindle forward or backward according to a difference in the number of rotations of the first motor 4 and the second motor 6 to perform Z axis control.
It provides a new means for Z-axis control of the headstock.
This case is not limited to the above embodiment,
Needless to say, for example, the pulse motor can be used as the motor and the detector can be omitted.

[0016]

Since the present invention is configured as described above, the following effects can be obtained. A first motor and a second motor, each of which rotation is controlled, are provided on one swivel axis, and the first rotor is engaged with the swivel axis and a screw member, and the second rotor is engaged with the swivel axis with an axial sliding guide member. By doing so, the turning shaft moves in the axial direction by the rotation of the first rotor, and when the first rotor and the second rotor are synchronously rotated, the turning shaft can only be turned. Therefore, by controlling the rotation of the first motor and the second motor at the same time, the turning shaft can be turned while moving in the axial direction. Since there is no need to temporarily stop the operation between the turning and the axial movement, a faster operation is possible. Further, since the configuration of the apparatus is simple, the production cost can be reduced even when the apparatus is applied to, for example, an exchange arm of a tool exchange apparatus. Since the number of parts is small, function reliability is high and maintenance is easy. A wide variety of applications such as turrets, chucks, and manipulators are expected due to the unitization.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a driving device of a turning shaft according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a turret tool post according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a driving device that performs turning and moving in the direction of the turning axis by using a single driving source and an electromagnetic clutch / brake according to the related art.

[Explanation of symbols]

 Reference Signs List 1 base 2 first stator coil 3 second stator coil 4 first motor 5 first rotor 6 second motor 7 second rotor 8 turning shaft 9 first housing 10 second housing 11 first sensor 12 second sensor 13 turning Member 14 Turret tool post 15 Turret 16 Carbic coupling

Claims (1)

[Claims] 1. A drive device for a turning shaft for turning and moving in an axial direction, comprising: a first stator coil and a second stator mounted on a base in a hole drilled in the direction of the turning shaft in an axial direction. A coil, the first stator coil and the first
A first rotor which forms a motor, has a female screw member in a center hole, and is supported on the base, a second stator coil and a second rotor;
A second rotor that forms a motor and has an axial sliding guide member in a center hole and is supported by the base; a male screw member screwed with the female screw member of the first rotor; and the shaft of the second rotor A rotary shaft having a shaft member having a shape engageable with the direction sliding guide member on the same axis, and a control device for integrally controlling the rotation of the first motor and the second motor, and comprising: A turning shaft drive device characterized in that turning and axial movement are continuously applied to the turning shaft by integrally controlling the rotation speeds of the two motors configured.