JPH0639670A - Reciprocating body driving device in machine tool - Google Patents

Abstract

PURPOSE:To convert the moving speed of a reciprocating body in a machine tool, in a wide range with simple structure, by using a single driving motor with a relatively small range of rotation speed as a driving source. CONSTITUTION:A rod member 7 forming spiral board grooves 9 and axial groves 11 on the peripheral surface, the first nut member 13 screwed rotatable to the spiral board groves, the second nut member 15 engaged movable to the axial grooves, and a nut holding housing 17 to hold the first and the second nut members 13 and 15, are provided. And either the rod member 7 or the nut holding housing 17 is installed to a reciprocating body 1, while the other side is installed to the frame F of a machine tool to compose this reciprocating body driving device, in the constitution by connecting the second nut member 15 to a shaft 31 to rotate the second nut member through a connecting and disconnecting clutch 35, and providing a brake 33 to the shaft 31, while rotating the first nut member 13 being connected to a driving motor 21 installed to the nut holding housing 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating body driving device in a machine tool for driving a reciprocating body in a machine tool.

[0002]

2. Description of the Related Art Conventionally, various structures such as a ball screw mechanism, a rack, a pinion mechanism, and a belt mechanism have been known as a mechanism for reciprocating a reciprocating body which is reciprocated in a machine tool.

For example, in a press machine using the above-mentioned structure, a motor for obtaining a large torque and a large number of revolutions is required in order to make the approach fast and slow the pressurization.
In order to improve this problem, a rod member having a spiral groove and an axial groove formed on its peripheral surface has already been provided as Japanese Patent Application No. 2-188133 filed by the present applicant. A first nut member that is rotatably screwed into the first nut member and a second nut member that is movably engaged with the axial groove, are rotated by a separately rotatable and fixable first drive motor and second drive motor, respectively. It is supposed to be fixed.

[0004]

By the way, in the above-mentioned conventional drive device, when the rod member having the spiral groove and the axial groove formed on the peripheral surface is provided, the rod member is rotatably screwed. The first drive motor and the second drive motor that respectively drive the combined first nut member and the second nut member that is movably engaged, even if the change rate of the reciprocating body moving speed is large, Small metering motors are sufficient compared to devices where rod members are not used.

However, the fact that two drive motors, the first drive motor and the second drive motor, are used means
There is a problem to be solved that it requires space and becomes expensive.

[0006]

In view of the above-mentioned problems, the present invention provides a rod member having a spiral groove and an axial groove formed on its peripheral surface, and is rotatably screwed into the spiral groove of the rod member. A nut support housing rotatably supporting a first nut member and a second nut member movably engaged with the axial groove is provided, and the first nut member is rotatable and fixable on the nut support housing. Drive motor, a drive system for rotating the second nut member is provided with a self-locking power transmission mechanism or a brake, and further connected to the drive motor through a detachable clutch, the rod member or the nut bearing housing. One of them is connected to a reciprocating body that can reciprocate in a machine tool, and the other is connected to a frame.

[0007]

In the above structure, the detachable clutch is disengaged to fix the rotation of the second nut member engaged with the axial groove of the rod member, and the power transmission mechanism is self-locking to the drive system for rotating the second nut member. If is not provided,
When the brake is applied and the drive motor is rotated, the rod member moves in the axial direction with low speed and high thrust with respect to the first nad member.

On the contrary, when the brake is removed, the detachable clutch is connected and the drive motor is rotated, the second nut member is also rotated, so that the rod member is also rotated and the rod member has a relatively high relative speed with respect to the first nut member. Moves with high speed and low thrust in the axial direction while rotating with.

That is, by appropriately fixing or rotating the second nut member, the rod member can be moved in the axial direction relative to the first nut member at a low speed and a high thrust force or a high speed and a low thrust force. It is possible.

It is easily understood that when the drive motor is rotated in the reverse direction or the speed is changed, the axial movement of the rod member is reversed and the degree of low speed or high speed is changed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a reciprocating body drive device 3 for reciprocating a reciprocating body 1 in a machine tool is constructed as follows.

That is, a rotatable thrust receiving member 5 which is in contact with the reciprocating body 1 and has a ball bearing is provided at the upper end,
In addition, a spiral groove 9 is formed on the peripheral surface of the rod member 7 extending in the vertical direction, and the spline-shaped axial groove 1 is formed.
1 is formed.

A first nut member (ball screw nut in this embodiment) 13 is rotatably screwed into the spiral groove 9, and a second nut member (spline nut) is inserted in the axial groove 11. 15 is engaged so as to be relatively movable in the axial direction.

The first nut member 13 and the second nut member 15 are attached to the frame F of the machine tool by an upper cover 17a.
Are rotatably supported via balls on the nut support housing 17, which is fixedly attached by the method of FIG.

A worm gear 19 is integrally bolted to the upper part of the first nut member 13, and the worm gear 19 is fixed to the worm gear 19 such as a servomotor mounted on the nut bearing housing 17 by rotation. A timing belt 23 and a worm 25 rotated by a worm shaft 25a are meshed with each other by a free drive motor 21.

A bent bevel gear (hypoid gear) 27 is integrally bolted to the lower portion of the second nut member 15. A shaft 31 of a small bevel gear 29 that meshes with the spiral bevel gear 27 is rotatably supported by a nut bearing housing 17 by a bearing, and a case is integrally attached to the nut bearing housing 17 at one end. The electromagnetically actuated brake 33 is provided, and the output member 35a of the electromagnetically actuable clutch 35 is attached to the other end.

Further, the input member 3 of the detachable clutch 35.
5b is provided with a pulley 37 rotatably supported on the shaft 31 by a bearing.
Pulley 4 mounted on the worm shaft 25a via 9
It is connected to 1.

The drive motor 21 is normally and reversely rotated under the control of an appropriate control device such as an NC device such as a servo motor or a pulse motor, and its rotation is freely controllable. It can be fixed by a servo lock or the like.

The shaft center of the spiral bevel gear 27 and the shaft center of the shaft 31 of the small bevel gear 29 are at right angles to each other because they are bevel gears, and from the top because of the use of spiral teeth. The axis is misaligned when you look at it. Therefore, the rod member 7
When is lowered, it can move below the level of the shaft 31 through the center hole of the spiral bevel gear 27, as shown by the chain double-dashed line in FIG. Further, a bellows 43 which is vertically expandable and contractible is provided between the rotary thrust receiver 5 and the upper cover 17a for the purpose of dust removal.

In the above structure, when the detachable clutch 35 is disengaged and the brake 33 is operated, the second nut member 15 is held in a fixed state. Therefore, when the drive motor 21 is normally rotated at a proper speed via the NC device, the timing belt 23, the worm shaft 25a, and the worm 2 are rotated.
5. Since the first nut member 13, which is a nut of the ball screw, is rotated via the worm gear 19, the rod member 7 is raised without rotating and the reciprocating body 1 is appropriately moved via the rotary thrust receiver 5. Increase with low speed and high thrust. If the drive motor 21 is rotated in the reverse direction, the reciprocating body 1 can be lowered at a low speed and a high thrust.

Next, the brake 33 is turned off, the detachable clutch 35 is put in, and the drive motor 21 is rotated in the forward direction at an appropriate speed, so that the second nut member 15, which is the outer cylinder portion of the ball spline, becomes Worm shaft 25a, timing belt 37, input member 35b, output member 35a, shaft 3
1, the bevel gear 29 and the bevel gear 27 are rotated.

Since this rotation direction is the direction in which the rod member 7 is raised with respect to the first nut member 13,
Since the rod member 7 can be raised while rotating at a high speed and with a low thrust at an appropriate speed, the reciprocating body 1 can be raised via the rotary thrust receiver 5. Drive motor 2
If 1 is reversed, the reciprocating body 1 can be lowered.

Therefore, even if the number of drive motors 21 is one and the control range of the rotation speed is relatively small, the vertical movement speed of the reciprocating body 1 can be easily extended with a simple structure. Can be changed.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

For example, in the embodiment, in order to rotationally drive the second nut member 15, the small bevel gear 29 and the spiral bevel gear 27 are used.
However, if these are replaced with a worm and a worm gear, the worm cannot be driven from the worm gear side depending on conditions such as the lead angle of the worm and the coefficient of friction between the teeth and the bearing. The nature is demonstrated. In this case, the purpose can be met without the brake 33 provided on the shaft 31.

[0026]

As will be understood from the above description of the embodiment, the first nut member formed on the peripheral surface of the rod member is provided with a drive motor that is rotatable and fixable, and is formed on the peripheral surface of the rod member. A drive system for rotating the second nut member is provided with a self-locking power transmission mechanism or a brake, and the drive motor is connected via a detachable clutch, so that the reciprocating body can operate at high speed or with a single drive motor. Can be moved slowly. Further, by using only one drive motor, space saving and cost reduction can be achieved.

Furthermore, even if a drive motor having a relatively small first rotation speed control range is mounted, a large change in speed in the axial direction can be easily obtained with a simple structure.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which 1
It is a schematic explanatory drawing which showed the section in section.

[Explanation of symbols]

 1 Reciprocating body 7 Rod member 9 Spiral groove 11 Axial groove 13 First nut member 15 Second nut member 17 Nut support housing 21 Drive motor 33 Brake 35 Detachable clutch

Claims (1)

[Claims] 1. A rod member having a spiral groove and an axial groove formed on its peripheral surface is provided, and a first nut member rotatably screwed into the spiral groove of the rod member and movably engaged with the axial groove. A nut support housing that rotatably supports the combined second nut member is provided, and a drive motor that rotates and fixes the first nut member is provided in the nut support housing, and a drive system that rotates the second nut member. Is provided with a self-locking power transmission mechanism or a brake, and is further connected to the drive motor via a detachable clutch, and one of the rod member and the nut support housing is a reciprocating body reciprocating in a machine tool, and the other is a frame. A reciprocating body drive device in a machine tool, characterized in that the reciprocating body drive device is connected to the.