JP2000283261A - Movable body driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive plural movable bodies at the same time or individually both in the normal and reverse directions at an arbitrary speed. SOLUTION: A feed screw 4 and a rotating shaft 6 are provided in parallel on a bed of a machine tool, and driven by one motor. A nut member 14 and a slide member 15 are rotatably assembled to a saddle 3, the nut member 14 is screw-engaged with the feed screw 4, and the slide member 15 is supported on the rotating shaft 6 to be integrally rotatable and movable in the axial direction. A rotation transmitting mechanism for transmitting rotation of the slide member 15 to the nut member 14 is composed of a pulley 24, a pulley 23 and a V belt 25. The groove widths of the pulleys 24, 23 are varied through an operating member 32 by a motor 30 to change the transmission ratio of the rotation transmitting mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for driving a plurality of moving bodies by a single motor through a single feed screw.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, Japanese Patent Laid-Open Publication No.
Japanese Patent Application Publication No. 68445 discloses a “moving body feeding device for a machine tool”. In this conventional device, FIG.
And two moving bodies 5 on a bed 51 as shown in FIG.
2 is slidably supported and one feed screw 5
3 and one rotating shaft 54 are supported by a single motor 55 so as to be able to rotate synchronously. A nut member 56 is screwed into the feed screw 53, and a slide member 57 is inserted into the rotation shaft 54, and these members 56 and 57 are rotatably assembled to the moving body 52. Gears 58 and 59 are supported by the nut member 56 and the slide member 57, and a clutch 60 is interposed between the gear 58 and the moving body 52.
The moving body 52 includes an actuator 6 for shifting the gear 58.
1 is provided.

[0003] The clutch 6 is actuated by an actuator 61.
When the gear 58 is disengaged and the gear 58 is disengaged from the gear 59, the nut member 56 idles on the feed screw 53, the power of the motor 55 is not transmitted to the moving body 52, and the moving body 52 is held in a stopped state. You. When the clutch 60 is engaged, the nut member 56 is fixed to the moving body 52, and the moving body 52 is driven in one direction with the rotation of the feed screw 53. Further, when the gear 58 is meshed with the gear 59, the rotation of the rotating shaft 54 is transmitted to the nut member 56, and the nut member 56 is rotated at a rotation speed different from that of the feed screw 53. The moving body 52 is driven in the opposite direction by the driving force 56.

[0004]

According to the conventional apparatus having the above structure, two moving bodies 52 can be simultaneously or individually corrected by a simple mechanism including one motor 55 and one feed screw 53. It can be driven in both reverse directions. However, since the speed of the moving body 52 is determined by the rotation speed of the feed screw 53 and the gear ratio, the speeds of the two moving bodies 52 cannot be made different unless the gears 58 and 59 are replaced. In addition, shifting operation was impossible.

An object of the present invention is to provide a device capable of driving a plurality of moving bodies simultaneously or individually in both forward and reverse directions at an arbitrary speed.

[0006]

In order to solve the above-mentioned problems, a moving body driving apparatus according to the present invention is an apparatus for driving a plurality of moving bodies by a single motor through a single feed screw. A rotation shaft is provided in parallel with the feed screw, the rotation shaft is connected to the motor via a power transmission means, a nut member is provided on each moving body, a slide member is rotatably assembled to at least one of the moving bodies, and the nut member is fed. A rotation transmission mechanism that is screwed into the screw, supports the slide member so as to be integrally rotatable and axially movable on the rotation shaft, and transmits rotation of the slide member to the nut member, and a transmission mechanism that changes the transmission ratio of the rotation transmission mechanism. Is provided.

Further, in the moving body driving device of the present invention, the rotation transmitting mechanism is provided on a pulley provided on a nut member and on a slide member so that the moving body can be shifted with a simple configuration. The transmission mechanism includes a pulley and a V-belt wound around each pulley, and the transmission mechanism includes a unit that changes a groove width of each pulley.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a saddle drive device for a machine tool will be described below with reference to the drawings. FIG. 1 shows the entire saddle drive device,
Two rails 2 are provided on a bed 1 of a machine tool, and two saddles 3 as a moving body are slidably supported on these rails 2. One feed screw 4 is rotatably supported on the bed 1 by a bearing 5 in a state parallel to the rail 2, and one rotary shaft 6 is connected to the feed screw 4.
And is rotatably supported by the bearing 7 in a state parallel to. The feed screw 4 is connected to a motor 9 via a coupling 8, and the rotating shaft 6 is connected to the motor 9 via a power transmission means including pulleys 10, 11 and a belt 12.
The feed screw 4 and the rotary shaft 6 are rotated in the same direction at the same rotation speed by one motor 9.

FIG. 2 shows the attachment mechanism of one saddle 3 in detail, but the other saddle 3 is equipped with a similar mechanism. A nut member 14 and a slide member 15 are assembled to the saddle 3 so as to be rotatable and integrally movable by bearings 16 and 17 and retainers 18 and 19.
The nut member 14 is screwed to the feed screw 4 and applies a driving force to the saddle 3 by relative rotation with the feed screw 4. The slide member 15 is inserted into the rotary shaft 6, and is supported by a key 21 fitted into a key groove 20 of the rotary shaft 6 so as to be able to rotate integrally with the rotary shaft 6 and to be movable in the axial direction of the rotary shaft 6.

A pulley 23 is provided at one end of the nut member 14. A pulley 24 is also provided at the slide member 15 at a position opposite to the pulley 23. A V-belt 25 is wound around the pulleys 23 and 24. . The pulley 23 on the nut member 14 side includes a fixed portion 23a and a movable portion 23b. The movable portion 23b is axially movably inserted into the nut member 14 by a key 26, and is urged toward the fixed portion 23a by a spring 27. ing. The pulley 24 on the slide member 15 side includes a fixed portion 24a and a movable portion 24b, and the movable portion 24b is inserted into the slide member 15 by a key 28 so as to be movable in the axial direction. The pulley 23, the pulley 24, and the V-belt 25 constitute a rotation transmission mechanism that transmits the rotation of the slide member 15 to the nut member 14.

On the other hand, a motor 30 is installed on the saddle 3, and an operating member 32 is screwed to an output shaft 31 of the saddle 3, and the tip of the operating member 32 is hooked on the movable portion 24b of the pulley 24 on the slide member 15 side. ing. And the operating member 32
As shown in FIG. 3, is moved by the motor 30 in parallel with the rotating shaft 6, shifts the movable portion 24b to change the groove width W2 of the pulley 24, and the groove width W1 of the pulley 23 via the V-belt 25. Is configured. Further, the motor 30 and the operating member 32 continuously change the pitch diameter D1 of the pulley 23 and the pitch diameter D2 of the pulley 24 in accordance with the groove widths W1 and W2, and continuously change the transmission ratio of the rotation transmission mechanism. This constitutes a speed change mechanism. In addition,
The motor 9 and the motor 30 are each controlled by an NC device (not shown) of the machine tool.

Next, the operation of the saddle drive device configured as described above will be described. In FIG. 1, the motor 9
Is activated, the feed screw 4 rotates forward in the direction of the arrow, and the rotating shaft 6 rotates in the same direction as the feed screw 4 at the same rotation speed. 2, the slide member 15 rotates integrally with the rotating shaft 6, and the rotation of the slide member 15 is transmitted to the nut member 14 via the pulley 24, the V-belt 25, and the pulley 23. At this time, the nut member 14 rotates in the same direction as the feed screw 4, but the number of rotations changes according to the ratio between the pitch diameter D1 of the pulley 23 and the pitch diameter D2 of the pulley 24.

For example, as shown in FIG.
In the case of W2, when D1: D2 = 1: 1, when the feed screw 4 makes one rotation, the nut member 14 also makes one rotation, no relative rotation occurs between the two, and the saddle 3 is held in a stopped state.
As shown in FIG. 3B, when W1> W2, D1: D2 =
In the case of 1: 2, when the feed screw 4 makes one turn, the nut member 14 makes two turns, that is, the nut member 14 makes one turn in the positive direction with respect to the feed screw 4, and the saddle 3 moves in one direction due to the relative rotation. Sent to As shown in FIG. 3C, when W1 <W2 and D1: D2 = 2: 1, when the feed screw 4 makes one turn, the nut member 14 makes 0.5 turn, that is, the nut member 14 becomes The saddle 3 is fed at a half speed in the direction opposite to that in the case of FIG.

Therefore, according to the saddle drive device of this embodiment, by controlling the motors 30 of the two saddles 3 separately, one saddle 3 is stopped and the other saddle 3 is moved in both forward and reverse directions. It can be sent at any speed, and both saddles 3 can be sent simultaneously in the same direction at the same or different speeds, or both saddles 3 can be sent simultaneously in the opposite direction at the same or different speeds. In addition, if the rotation speed of the motor 9 is controlled, the feed speed of the saddle 3 can be further variously changed.

The present invention is not limited to the above-described embodiment, and may be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention, as exemplified below. It is possible. (1) Use a fluid pressure cylinder or solenoid instead of the motor 30. (2) The operating member 32 is connected to the pulley 23 on the nut member 14 side.
To the movable part 23b. (3) The present invention is applied to a machine tool having three or more moving bodies. (4) Some moving bodies do not include a rotatable slide member. (5) The present invention is applied to a moving body drive device of various industrial machines other than a machine tool.

[0016]

As described in detail above, according to the moving body driving apparatus of the present invention, the rotation of the slide member is changed in speed and transmitted to the nut member, so that a plurality of moving bodies can be simultaneously or individually. This provides an excellent effect that the motor can be driven at any speed in both the forward and reverse directions.

[Brief description of the drawings]

FIG. 1 is a plan view of a saddle drive device showing one embodiment of the present invention.

FIG. 2 is a sectional view showing part A of FIG. 1 in detail.

FIG. 3 is an explanatory diagram of an operation of a transmission mechanism.

FIG. 4 is a plan view showing a conventional moving body driving device.

FIG. 5 is a sectional view showing a portion B in FIG. 4 in detail.

[Explanation of symbols]

1 · bed, 3 · saddle, 4 · · lead screw, 6 · · ·
Rotary shaft, 9 motor, 10, 11, pulley, 12
· Belt, 14 · · · nut member, 15 · · · slide member, 23, 24 · · · pulley, 25 · · · V belt, 30 ·
・ Motor, 32 ・ ・ Operation member.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 9/18 H02K 7/10 D 25/20 7/116 H02K 7/10 B23Q 1/20 Z 7/116

Claims (2)

[Claims] 1. A device for driving a plurality of moving bodies by a single motor via a single feed screw, wherein a rotary shaft is provided in parallel with the feed screw, and the rotary shaft is connected to the motor via a power transmission means. Then, a nut member is provided on each moving body, a slide member is rotatably assembled to at least one of the moving bodies, the nut member is screwed into the feed screw, and the slide member is integrally rotatable on the rotating shaft and axially movable. A rotation transmission mechanism that supports and transmits the rotation of the slide member to the nut member;
A moving body drive device comprising a transmission mechanism for changing a transmission ratio of a rotation transmission mechanism. 2. The rotation transmission mechanism includes a pulley provided on a nut member, a pulley provided on a slide member, and a V-belt wound around each pulley, and the transmission mechanism includes 2. The moving body driving device according to claim 1, further comprising means for changing a groove width of the moving body.