JP2001062653A - Work supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a load proportioning an unbalance load even when the attitude variation position of a work support member is changed and a load by rotation of a work support member is changed and effectively reduce a load exerted on a servo motor. SOLUTION: This support device is provided with load reducing mechanisms 18A and 18B to support a work support member 12 when the work support member 12 to support a work 13 is rotated around a horizontal one axis by a servo motor 15 and varies an attitude and arranged prescribed attitude variation positions P1 and P2, and reduce load exerted on the servo motor 15 through operation of an elastic member 25. When the work support member 12 is varied in an attitude from a central original position P3 to two attitude variation positions P1 and P2 on both sides, the load reducing mechanisms 18A and 18B are situated corresponding to the respective attitude variation positions P1 and P2 on both sides of attitude variation operation of the work support member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supporting device for supporting a work in a machine tool or the like.

[0002]

2. Description of the Related Art As a conventional work supporting apparatus of this type, for example, the following structure is known. That is, in this conventional configuration, the work supporting member for supporting the work is rotated by driving means such as a servomotor to change the posture, and is arranged at a predetermined posture change position such as a processing position. I have. Further, a balance cylinder is continuously provided with the work supporting member, and the work supporting member is held at a predetermined posture changing position by the balance cylinder, so that a load applied to driving means such as a servomotor is reduced. .

[0003]

However, in this conventional work supporting apparatus, since the balance load of the balance cylinder is constant, the rotation angle rotated by the posture change position of the work supporting member changes. When the load applied to the work supporting member becomes unbalanced, there is a problem that it is impossible to cope with the imbalance. For this reason, a large load torque acts on a driving means such as a servomotor for changing the posture of the work supporting member, and the load torque does not become constant depending on the posture change position. Therefore, the driving means needs to be a large-sized one that generates a large torque that is not affected by the load torque due to the posture change.

[0004] Further, in the configuration provided with the balance cylinder, not only the cylinder but also a mechanism for supplying a fluid to the cylinder is required, which complicates the configuration and requires extra equipment. In particular, in a work supporting apparatus in which the work supporting member is rotated from the original position at the center to two posture changing positions on both sides, a pair of balance cylinders is required on both sides, and the structure is further complicated. There was a problem.

[0005] The present invention has been made by paying attention to such problems existing in the prior art. Its main purpose is that even when the position of the work supporting member changes its position and the load becomes unbalanced, it can exert a constant balanced load in proportion to the load and reduce the load on the drive means. It is an object of the present invention to provide a work supporting device which can be reduced substantially uniformly and which can use a small driving means.

It is a further object of the present invention that the work supporting member is configured to change its posture from an original position, which is arranged at a balance in the center of the rotating shaft, to two posture changing positions on both sides. Even in such a case, an object of the present invention is to provide a work supporting device capable of reliably receiving and holding a work supporting member at two posture change positions with a simple configuration.

[0007]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, according to the first aspect of the present invention, a work supporting member for supporting a work is changed in posture by a driving means. In the apparatus, when the work supporting member is disposed at a predetermined posture change position in accordance with the posture change, the work supporting member or a member operated integrally therewith is received, and a load applied to the driving means is changed to an elastic member. The present invention is characterized in that there is provided a load reducing means for reducing the load by the action of (1).

Therefore, even if the posture position of the work supporting member changes and the rotational moment due to the unbalanced load changes, the elastic member of the load reducing means elastically deforms according to the rotational moment, and the unbalanced load is reduced. A proportional balance load can be exhibited. Therefore, the load on the driving means can be effectively reduced. For this reason,
The load torque applied to the driving means for driving the work supporting member is reduced, and a small driving means can be used. In addition, load reduction means using an elastic member
Unlike the load reduction means comprising a cylinder, the configuration is simple.

According to a second aspect of the present invention, in the work supporting apparatus according to the first aspect, the work supporting member changes its posture by rotating around a single axial line arranged horizontally. Things.

Therefore, even in a configuration in which the work supporting member is rotated about a horizontally disposed one axis to change the posture, the load applied to the driving means when the work supporting member is rotated and positioned at the posture changing position. Can be effectively reduced.

According to a third aspect of the present invention, in the work supporting apparatus according to the first or second aspect, the load reducing means is arranged corresponding to a posture changing position of the posture changing operation of the work supporting member. It is a feature.

Therefore, even when the work supporting member is configured to change its posture from the original position, which is disposed at the center of the rotation shaft while maintaining a balance, to two posture changing positions in both sides, the work can be formed with a simple structure. The support member can be reliably received and held at the two posture change positions. Therefore, when the work supporting member is arranged at each posture changing position, it is possible to effectively reduce the load applied to the driving means.

According to the fourth aspect of the present invention, the first to third aspects are provided.
In the work supporting device according to any one of the above, the load reduction means has a moving body that is moved in contact with the work supporting member or a member that is integrally operated therewith, and the elastic member is provided with a moving body. It is characterized by being elastically deformed in accordance with the movement to reduce the load on the driving means. The support member is supported by, for example, a workpiece support member or a member that is integrally operated with the work support member.

Therefore, when the work supporting member is located at the position of changing the posture, the elastic member is elastically deformed via the moving body to maintain the balance between the left and right loads, and to surely reduce the load applied to the driving means. Can be.

According to a fifth aspect of the present invention, in the work supporting apparatus according to the fourth aspect, the moving body comprises a rod which is moved in the axial direction by contact with the work supporting member, and the elastic member comprises a rod. And a coil spring that is compressed as the rod moves to generate a resilient force in accordance with the amount of movement of the rod.

Therefore, the structure of the load reducing means is simple, and the load applied to the driving means can be reliably reduced when the work supporting member is arranged at the position for changing the posture.

According to the sixth aspect of the present invention, the first to fifth aspects are provided.
Wherein the roller is rotatably provided on the work supporting member, and the roller is brought into contact with the load reduction means.

Accordingly, the elastic member of the load reducing means can be accurately elastically deformed following the posture changing operation of the work supporting member, and the load applied to the driving means can be reliably reduced.

[0019]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a work support member 12 is rotatably supported on a horizontal axis about a frame 11, and a work 13 is detachably mounted and supported on an upper portion thereof via a chuck 14 or the like. It has become. The work supporting member 12 is connected to a servo motor 15 as a rotation driving means. The servo motor 15 rotates the work supporting member 12 together with the work 13 to change the posture as two processing positions indicated by chain lines in FIG. The posture is changed to the positions P1 and P2.

A rotation plate 16 is attached to an end of the work supporting member 12, and a pair of rollers 17 are rotatably supported on the rotation plate 16 so as to face a rotation axis.
The frame 1 is mounted so as to be able to contact both rollers 17.
1 includes a load reduction mechanism 18 as a pair of load reduction means.
A and 18B are provided via a bracket 19.
When the work supporting member 12 is disposed at the posture change positions P1 and P2 in accordance with the posture changing rotation, the rotational moment due to the unbalanced load of the work supporting member 12 and the work 13 causes the load reduction mechanisms 18A and 18B via the roller 17. And the load on the servomotor 15 is reduced.

Accordingly, each of the load reduction mechanisms 18A, 18
B will be described in detail. A support cylinder 20 is screwed to the bracket 19 so as to be adjustable in height, and is fixed at a predetermined height position by a nut 21. A rod 22 as a moving body is inserted into the center of the support cylinder 20 so as to be movable in the axial direction in which the rod 22 expands and contracts.
A head 22a that can contact the roller 17 at the end of the support cylinder 20 is formed, and a stop nut 23 that can be engaged with the lower end of the support cylinder 20 is screwed to the lower end so as to be position-adjustable.

On the outer periphery of the support tube 20, a spring receiving tube 24 is provided.
Are movably inserted, and the spring receiving cylinder 24 and the support cylinder 2
A coil spring 25 as an elastic member is interposed between the coil spring 25 and the coil spring 25. Then, the work support member 12 and the work 13
Is positioned at the position P1, P2, respectively, the roller 17 contacts the head 22a of one of the rods 22, the rod 22 is moved downward, and the coil spring 2
5 is compressed and deformed. As a result, the coil spring 25 exerts a balance load corresponding to the rotational moment due to the unbalanced load of the work supporting member 12 and the work 13, and the load applied to the servo motor 15 is reduced.

Next, the operation of the work supporting device configured as described above will be described. Now, in this work support device, when the work support member 12 and the work 13 are arranged at the center original position P3 shown by the chain line in FIG. 1, both rollers 17 are connected to the rod 2 of each load reduction mechanism 18A, 18B.
The second head 22a is disposed at a position slightly separated from the head 22a. For this reason, the rod 22 of each load reduction mechanism 18A, 18B causes the spring receiving cylinder 2
4 and is held at a position regulated by the engagement between the stop nut 23 and the lower end of the support cylinder 20.

In this state, the work supporting member 12 and the work 13 are rotated clockwise in FIG. 1 by the servo motor 15 so that one of the posture changing positions P from the central original position P3.
When the posture is changed to 1, as shown in FIG. 3, one roller 17 abuts on the head 22a of the rod 22 of the one load reduction mechanism 18A. As a result, the rod 22 is moved downward, and the coil spring 25 is compressed via the spring receiving tube 24, and the coil spring 25 generates an elastic force according to the amount of movement of the rod 22, and is applied to the servomotor 15. The load is reduced.

On the other hand, the servo motor 15
When the work supporting member 12 and the work 13 are rotated in the counterclockwise direction in FIG. 1 to change the posture from the center original position P3 to the other posture change position P2, as shown in FIG.
The other roller 17 contacts the head 22a of the rod 22 of the other load reduction mechanism 18B. Thereby, the rod 22
Is moved downward, and the coil spring 25 is
, And the coil spring 25 generates an elastic force according to the moving amount of the rod 22, and the load applied to the servomotor 15 is reduced.

The effects that can be expected from the above embodiment will be described below. In the work supporting device of this embodiment, the work supporting member 12 supporting the work 13 is
The posture is changed by a predetermined posture change position P1, P2
, Load reduction mechanisms 18A and 18B for receiving the work supporting member 12 and reducing the load applied to the servo motor 15 by the action of the elastic member 25 are provided.

For this reason, even when the position change positions P1 and P2 of the work supporting member 12 change and the rotational moment due to the eccentric load changes, the elasticity of the load reduction mechanisms 18A and 18B according to the rotational moment due to the eccentric load. Member 25
Can be elastically deformed to exert a balance load corresponding to the rotational moment due to the unbalanced load. Therefore, the load applied to the servo motor 15 can be effectively reduced. That is, since the elastic member 25 exerts a repulsive force according to the amount of compression, for example, in the embodiment, the work supporting member 12 is greatly inclined, and a downward moment or downward turning acting on the work supporting member 12 is performed. Even if the dynamic torque increases, the elastic member 25 generates a repulsive force against it.

Therefore, the downward moment or the downward rotational torque is reduced by the elastic member 25, and a large load does not act on the servo motor 15 for rotating the work supporting member 12. For this reason, it is not necessary to use a servomotor 15 having an excessive driving torque, and a small servomotor 15 can be used.

Also, unlike the cylinders, the load reduction mechanisms 18A and 18B utilizing the function of the elastic member 25 do not require a fluid supply mechanism or the like, and have a simple configuration. In the work supporting device of this embodiment, the posture of the work supporting member 12 is changed by rotating the work supporting member 12 about one horizontal axis. For this reason, even in a configuration in which the work supporting member 12 is rotated about one axis and the posture is changed, the work supporting member 12 is also in the posture changing position P1,
The load applied to the servomotor 15 when it is rotated at P2 can be effectively reduced.

In the work support device of this embodiment, the load reduction mechanisms 18A and 18B
2 are provided corresponding to the posture change positions P1 and P2 on both sides of the posture change operation. For this reason, even when the work supporting member 12 is configured to change its posture from the center original position P3 to the two posture changing positions P1 and P2 on both sides, the work supporting member 12 can be attached to both ends of the work supporting member 12 with a simple configuration. The two posture change positions P1, P1 are provided via the rotating plate 16 provided.
P2 can be reliably received and held. Therefore,
When the work supporting member 12 is disposed at each of the posture change positions P1 and P2, the load applied to the servomotor 15 can be effectively reduced.

The work supporting apparatus of this embodiment has a rod 22 in which the load reduction mechanisms 18A and 18B abut on a pair of rollers 17 provided at the end of the rotating plate 16 and are moved in the axial direction. The elastic member is connected to the rod 22
The coil spring 25 generates a resilient force corresponding to the amount of movement of the rod 22 by being compressed with the movement of the rod 22. For this reason, the configuration of the load reduction mechanisms 18A and 18B is simple, and the work supporting member 12 is
When arranged at P2, the coil spring 25 is compressed and deformed via the rod 22, exerts a balance load, and the load applied to the servomotor 15 can be reliably reduced.

In the work supporting device of this embodiment, the rotating plate 1 provided integrally with the work supporting member 12
6 is rotatably mounted on a pair of rollers 17 provided at the ends of the load reducing mechanisms 18A, 1A.
8B. For this reason, regardless of the magnitude of the angle of the posture of the work support member 12, the load reduction mechanism 1 is always opposed to the elastic member from the same direction.
A force will be applied to 8A and 18B. Therefore, the coil springs 25 of the load reduction mechanisms 18A and 18B can be accurately compressed and deformed following the posture changing operation of the work supporting member 12, and the load applied to the servomotor 15 can be reduced reliably.

(Modification) This embodiment can be modified and embodied as follows. In the above-described embodiment, the work supporting member 12 is configured to be moved linearly without being rotated, and to be changed to the posture changing position.

In the above embodiment, when the posture of the work support member 12 is changed to the posture change positions P1 and P2, a part of the work support member 12, for example, a projection provided on the work support member 12 is moved by the load reduction mechanism 18A, It is configured to be in contact with the rod 22 of 18B.

In the above embodiment, a member having elasticity different from that of the coil spring, for example, a leaf spring is used as the elastic member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a work supporting device of the present invention.

FIG. 2 is a partially broken plan view of the work supporting device of FIG.

FIG. 3 is a cross-sectional view showing an operation state of the work supporting apparatus of FIG.

FIG. 4 is a cross-sectional view showing an operation state to the other posture change position.

[Explanation of symbols]

12 work support member, 13 work, 15 servo motor as drive means, 17 roller, 18a, 18b
... Load reduction mechanism as load reduction means, 19 ... Bracket, 20 ... Support cylinder, 22 ... Rod as moving body, 24
... Spring receiving cylinder, 25 ... Coil spring as elastic member, P
1, P2: posture change position, P3: central original position.

Claims (6)

[Claims] 1. A work supporting apparatus in which a posture of a work supporting member for supporting a work is changed by driving means, wherein the work supporting member is arranged at a predetermined posture changing position in accordance with the posture change. A work supporting apparatus, comprising: a load-reducing means for receiving a support member or a member operated integrally with the support member to reduce a load applied to the driving means by an action of an elastic member. 2. The work support device according to claim 1, wherein the work support member rotates around a single axis to change the posture. 3. The work supporting apparatus according to claim 1, wherein the load reducing means is arranged corresponding to a position change position of the position changing operation of the work supporting member. 4. The work supporting apparatus according to claim 1, wherein the load reducing unit has a moving body that is moved in contact with the work supporting member or a member that is integrally operated therewith. The work supporting device is characterized in that the elastic member is elastically deformed in accordance with the movement of the moving body to reduce a load applied to the driving means. 5. The work supporting device according to claim 4, wherein the movable body is composed of a rod that is moved in an axial direction by abutting on the work supporting member, and the elastic member is compressed as the rod moves. A work supporting device comprising a coil spring that generates a resilient force in accordance with the amount of movement of the rod. 6. The work support device according to claim 1, wherein a roller is rotatably provided on the work support member, and the roller comes into contact with the load reduction means. Support device.