JPH0259035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for an automatic spot welding machine, and in particular, it enables a gun for spot welding to be rotated in any direction, thereby improving the quality of spot welding and increasing productivity. The present invention relates to an improved drive device for an automatic spot welding machine.

Conventionally, as shown in FIG. 1, a drive device 1 for an automatic spot welding machine includes, for example, first, second, and third drive mechanisms 2, 3, and 4, and a spot welding gun 5 includes: Drive motor 6 of first drive mechanism 2
This allows the gun 5 to rotate about its axis in the direction of arrow A-A. The first drive mechanism 2 is rotated by the drive motor 7 of the second drive mechanism 3 in a direction perpendicular to the axis of the gun 5 in the direction of arrow B--B. Further, the second drive mechanism 3 is driven integrally with the first drive mechanism 2 by the drive motor 8 of the third drive mechanism 4, so that the second drive mechanism 3 rotates in the direction of the arrow C- which is orthogonal to the rotation plane in the direction of the arrow B-B. It is designed to rotate in the direction of C.

Although the gun 5 can be rotated in three directions in this way, the rotation angle of the gun 5 is restricted because complicated piping and wiring to the drive motors 6, 7, and 8 are required, and the spot welding surface is However, it is difficult to rotate and set the gun 5 in the optimum direction, for example, in the right angle direction, resulting in a disadvantage that the quality of spot welding deteriorates and productivity also decreases. In addition, as the radius of rotation of the rotating part to which the gun 5 is attached increases, the weight of the rotating part also increases, resulting in an increase in inertial mass and a deterioration in the accuracy with which the gun 5 is stopped.

The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to perform spot welding in an automatic spot welding machine that rotates a spot welding gun in multiple directions. By making it possible to smoothly rotate the gun in any direction using a drive mechanism consisting of a gear train, it is possible to always maintain the optimum direction relative to the spot welding surface, such as a direction perpendicular to the spot welding surface. The purpose of this invention is to enable spot welding by rotating the gun, and thereby to improve quality such as strength of spot welding and improve productivity. Another purpose is to keep the drive motor itself stationary, reduce the radius of rotation of the rotating part to which the gun is attached, and reduce the weight of the rotating part, thereby reducing the inertial mass of the gun. The objective is to improve the stopping accuracy of the Still another object is to drive a drive mechanism that drives the gun in one direction while independently driving a plurality of other drive mechanisms that drive the gun in multiple directions, so that the gun can rotate smoothly in any direction. The purpose is to make it possible to drive the vehicle.

In short, the present invention provides a first motor, which is provided with first, second and third drive motors that are progressively disposed on a fixed member, and a first housing that is driven by the first drive motor. a second drive mechanism including a drive mechanism, a second housing mounted within the first housing and driven by the second drive motor; and a spot weld mounted on the second housing. a third drive mechanism for rotating a gun drive shaft of the gun by the third drive motor; and a third drive mechanism for rotating the second and third drive mechanisms while driving the first drive mechanism. It consists of an idle gear mechanism that can drive each gun, and the third
The first drive mechanism is rotated around the axis by the drive mechanism, and rotated by the second drive mechanism in a direction perpendicular to the axis, and while driving the second and third drive mechanisms. The gun is characterized in that it is configured to rotate the gun in any direction by driving the gun.

The present invention will be explained below based on embodiments shown in the drawings. A drive device 11 for an automatic spot welding machine according to the present invention includes first, second and third drive motors 12,
13, 14, a first drive mechanism 15, an idle gear mechanism 16, a second drive mechanism 17, a third drive mechanism 18, and a gun 19 for spot welding.

First, the first, second and third drive motors 12,1
3 and 14, each drive motor, for example, a pulse motor, is centrally arranged on a fixed member 21 (device mounting base), and its rotation is controlled by an input signal from a computer (not shown). It is becoming more and more like this. First drive mechanism 15
consists of a first reduction gear 22 connected to a first drive motor 12, and a first housing 24 fixed to the tip of a reduction gear shaft 23 of the first reduction gear.

The idle gear mechanism 16 includes a pair of first and second idle gears 26 and 27 that are rotatably supported on a reduction gear shaft 23 via a bearing 25, and a first connection that meshes with the first idle gear 26. Gear 28 and
A second connecting gear 29 meshes with a second idle gear 27. First connecting gear 28
The motor shaft 3 of the second pulse motor 13 is rotatably supported by the fixed member 21 via a bearing 25.
0, and the second connecting gear 29
The motor shaft 3 of the third pulse motor 14 is rotatably supported by the fixed member 21 via a bearing 25.
It is fixed to the tip of 1.

The second drive mechanism 17 includes a first planetary gear 35
, a pair of bevel gears 36 and 37, a pair of connection gears 38 and 39, a second reduction gear 40, and a second housing 41. The bearing 25 is set to the same size as the connecting gear 28, and the first housing 24 has a bearing 25.
The connecting shaft 45 is fixed to one end of a connecting shaft 45 which is rotatably supported through the connecting shaft 45, and meshes with the first idle gear 26. A pair of bevel gears 36 and 37 are in mesh with each other, and one bevel gear 36 is connected to the connecting shaft 4.
The other bevel gear 37 is fixed to one end of a connecting shaft 46 rotatably supported by the first housing 24 via a bearing 25.

The pair of connecting gears 38 and 39 mesh with each other and are set to have the same size. One connecting gear 3
8 is fixed to the other end of the connecting shaft 46, and the other connecting gear 39 is fixed to the connecting shaft 47 rotatably supported by the second reduction gear 40. Second
The reducer shaft 48 of the reducer 40 is rotatably supported by the first housing 24.
A second housing 41 is fixed to the tip of the housing 8 .

The third drive mechanism 18 has a second planetary gear 50
, a pair of intermediate bevel gears 51 and 52, a pair of connection gears 53 and 54, a third reduction gear 55, and a pair of drive bevel gears 56 and 57, and the second planetary gear 50 is , are set to have the same size as the second connecting gear 29, and the first housing 2
The second idle gear 2 is fixed to one end of a connecting shaft 58 that is rotatably supported by
It meshes with 7. A pair of intermediate bevel gears 51, 5
2 are in mesh with each other, and one intermediate bevel gear 51 is
The other intermediate bevel gear 52 is fixed to one end of a coupling shaft 59 rotatably supported by the first housing 24 via a bearing 25.

The pair of connecting gears 53 and 54 mesh with each other, and are set to have, for example, the same size (they do not have to be the same size). One of the connecting gears 53 is
It is fixed to the other end of the connecting shaft 59, and the other connecting gear 54 is fixed to the connecting shaft 60, which is rotatably supported by the third reduction gear 55. The reducer shaft 65 of the third reducer 55 is connected to the first housing 24
is rotatably supported via a bearing 25,
One drive bevel gear 56 is fixed to the tip of the reduction gear shaft 65.

The pair of drive bevel gears 56 and 57 are in mesh with each other, and the other drive bevel gear 57 is fixed to the tip of a gun drive shaft 66 rotatably supported by the second housing 41. Gun 1 for spot welding
9 is fixed to the second housing 41 by a connecting member 68 and fixed to the gun drive shaft 66.

Then, the gun 19 is rotated around the axis in the direction of arrow D-D by the third drive mechanism 18, and the second
arrow E in the direction perpendicular to the axis by the drive mechanism 17 of
-E direction, and then the first drive mechanism 15
The second drive mechanism 17 and the third drive mechanism 1
8 are configured to rotate integrally around the axis of the reducer shaft 23 in the direction of arrow FF.

The present invention is configured as described above, and its operation will be explained below. When rotating the gun 19 around the axis in the direction of arrow DD, the third pulse motor 14 is rotated by an input signal from the computer. Then, motor shaft 3
1. A second planetary gear 50 rotates at the same speed as the second connecting gear 29 via the second connecting gear 29 and the second idle gear 27, and a pair of intermediate bevel gears 51 and 52; connection gears 53, 54,
a third reduction gear 55 and a pair of drive bevel gears 56;
57, the gun drive shaft 66 rotates, and the gun 19
rotates around the axis in the direction of arrow D-D.

When rotating the gun 19 in the direction of arrow E-E perpendicular to the axis, the second pulse motor 13
is rotated by an input signal from a computer. Then, the motor shaft 30 and the first connecting gear 28
and the first idle gear 26, the first planetary gear 35 rotates at the same speed as the first coupling gear 28, and further rotates the pair of bevel gears 36, 37, the coupling gears 38, 39, and the second reduction gear. The second housing 41 is rotated via the machine 40, and the gun 19 is rotated in the direction of arrow EE in a direction perpendicular to the axis.

The second drive mechanism 17 and the third drive mechanism 18 are integrally moved around the axis of the reducer shaft 23 in the direction indicated by the arrow F-F.
When rotating in the direction of , the first pulse motor 12 is rotated by an input signal from the computer. Then, the first housing 24 rotates via the first reduction gear 22, and the second drive mechanism 1
7 and the third drive mechanism 18 are integrally connected to the reducer shaft 2.
3 in the direction of arrow FF.

and first, second and third pulse motors 1
2, 13, and 14 simultaneously or separately, the gun 19 can be rotated to any angle, and since these pulse motors are centrally arranged on the fixed member 21, these Piping and wiring for the pulse motor are simplified, and the gun 19
Even when rotating 360°, piping and wiring rotate smoothly without interference. In addition, the radius of the rotating part is considerably smaller than that of the conventional example shown in FIG.
Improves stopping accuracy.

Further, the idle gear mechanism 16 rotates the second pulse motor 13 or the third pulse motor 14 while the first pulse motor 12 rotates the first housing 24 to generate a second drive. Mechanism 17 or third drive mechanism 18 can be driven. That is, when the first housing 24 is rotating, the first planetary gear 35 revolves on the first idle gear 26, but when the second pulse motor 13 rotates, the first planetary gear 35 revolves on the first idle gear 26. 28 and the first idle gear 26, and the second
The housing 41 rotates. Similarly, the second planetary gear 50 revolves on the second idle gear 27, but when the third pulse motor 14 rotates,
Second connection gear 29 and second idle gear 27
The gun drive shaft 66 rotates. In this way, even when the first housing 24 is rotating, the second and third drive mechanisms 17 and 18 can be smoothly driven.

In this embodiment, the tooth profile of each gear is shown as a straight tooth, but a helical tooth profile may also be used.

Since the present invention is constructed and operates as described above, in an automatic spot welding machine in which a spot welding gun is rotated in multiple directions, the spot welding gun is constructed by a gear train. Since the gun can be smoothly rotated in any direction by the drive mechanism, the gun can always be rotated in the optimal direction, for example, at right angles to the spot welding surface, and as a result, This has the effect of improving the quality of spot welding, such as strength, and improving productivity. In addition, since the drive motor itself can be kept stationary, the radius of rotation of the rotating part to which the gun is attached becomes smaller and the weight of the rotating part is reduced, which reduces the inertial mass and improves the accuracy of stopping the gun. It has an improving effect. In addition, an idle gear mechanism is provided, and while driving the drive mechanism that drives the gun in one direction, multiple other drive mechanisms that drive the gun in multiple directions can be individually driven, so the gun can be smoothly moved in multiple directions. This has the advantage that it can be rotated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a drive device of a conventional automatic spot welding machine, FIGS. 2 and 3 relate to an embodiment of the present invention, and FIG. 2 is a perspective view of a drive device of an automatic spot welding machine. FIG. 3 is a cross-sectional view of what is shown in FIG. 11 is a drive device of an automatic spot welding machine, 12 is a first drive motor, 13 is a second drive motor, 1
4 is a third drive motor, 15 is a first drive mechanism,
16 is an idle gear mechanism, 17 is a second drive mechanism, 18 is a third drive mechanism, 19 is a gun for spot welding, 21 is a fixing member, 24 is a first housing, 41 is a second housing, 66 is the gun drive shaft.

Claims (1)

[Claims] 1 a first housing having first, second and third drive motors centrally arranged for a fixing member and a first housing driven by the first drive motor;
a second drive mechanism mounted within the first housing and driven by the second drive motor;
a second drive mechanism provided with a housing; a spot welding gun mounted on the second housing; and a third drive for rotating a gun drive shaft of the gun by the third drive motor. and the second and third drive mechanisms while driving the first drive mechanism.
an idle gear mechanism capable of driving respective drive mechanisms; a third drive mechanism rotates the gun around the axis; and a second drive mechanism rotates the gun in a direction perpendicular to the axis. an automatic spot welding machine, characterized in that the gun is configured to be rotated in an arbitrary direction by driving the gun and driving the first driving mechanism while driving the second and third driving mechanisms. drive unit.