JPH0225587Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention involves attaching a machining device (in the broadest sense, including welding machines and electrical discharge machines) and moving it to a desired machining position. The present invention relates to a position indexing device for causing the device to perform a predetermined processing operation.

(Prior Art) Conventionally, a slide table device using a ball screw mechanism is known as a device for attaching a machining device and moving it to a desired machining position to cause the machining device to perform a predetermined machining operation. This item includes a pair of slide rails arranged parallel to each other, a slide member movably supported by the slide rails, a ball screw connected to the slide member and arranged parallel to the slide rails,
An upper slide table having the same structure as the lower slide table is assembled in a cross shape on top of the lower slide table, which is equipped with a DC pulse motor directly connected to one end of a ball screw. A machining device is attached to the slide member, and the machining device is moved to a desired machining position by moving both slide members in directions orthogonal to each other.

However, according to this device, since the DC pulse motor is directly connected to one end of the ball screw, there is a problem that the device itself becomes large and the installation space becomes large. Further, in order to change the rotational speed of the DC pulse motor, for example, if a speed change mechanism is interposed between the output shaft of the DC pulse motor and the ball screw, the structure becomes complicated and the manufacturing cost increases.

(Purpose of the invention) The object of the invention is to provide a highly versatile position indexing device that solves the above problems.

(Structure of the invention) Therefore, the structure of the invention is that, in a position indexing device connected to a positioning numerical control device, a movable arm having a work device mounting portion slidably supported by a support member fixed in a casing. and a rack attached to the side surface of the movable arm, a drive shaft having a pinion at one end that meshes with the rack, and a rotational drive source connected to the drive shaft via a worm gear. .

(Function) With this configuration in which the rotary drive source and the drive shaft are connected via the worm gear, the rotary drive source can be arranged in parallel with and adjacent to the movable arm, making the device itself more compact. Further, the worm gear has a role as a transmission mechanism by setting the ratio of the number of teeth between the worm and the worm wheel to a required number of teeth.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. 1 is a casing, 2 is a bearing as a support member fixed to the bottom surface of the casing 1, and a guide rail 3 is fitted onto the upper part of the bearing 2 so as to be slidable in the Y and Y' directions.
One end of the guide rail 3 extends toward the outside of the casing 1, as shown in FIG.

As shown in Fig. 3, a movable arm 4 is fixedly provided on the upper part of the guide rail 3, and a machining device is installed at the center and both ends in the longitudinal direction (Y, Y' directions in Fig. 1). (not shown) are provided with machining device attachment portions 5a, 5b, and 5c. A rack 6 is attached to one side of the movable arm 4 over its entire length.

Reference numeral 7 denotes a drive shaft disposed on the rack side of the movable arm 4 at right angles to the movable arm 4, and a pinion 8 at one end thereof meshes with the rack 6 of the movable arm 4.
is formed, and a worm wheel 9 is fixed to the other end of the drive shaft 7. A seal member 10 prevents oil leakage 1 from a casing 11 that houses the drive shaft 7.

Reference numeral 12 denotes an AC variable speed motor serving as a rotational drive source for rotationally driving the drive shaft 7, and the AC variable speed motor 12
The output shaft portion 12a is disposed so as to extend in a direction perpendicular to the drive shaft 7, that is, in the same direction as the direction in which the movable arm 4 extends.
A worm 13 is provided which meshes with a worm wheel 9 formed in the worm wheel 9. Therefore, the AC variable speed motor 12 rotates the drive shaft 7 at a rotation speed corresponding to the tooth ratio of the worm 13 and the worm wheel 9, and the rotational movement of the drive shaft 7 is transmitted through the pinion 8 and the rack 6. This is converted into a rectilinear movement of the movable arm 4.

The AC variable speed motor 12 is connected to a positioning numerical control device (not shown), and is controlled to rotate forward, reverse, and stop by the positioning numerical control device, thereby controlling the movable arm 4. It is designed to be positioned and fixed at any position in the Y and Y' directions.

As shown in FIG. 1, slide blocks 14a and 14b are provided on one side of the movable arm 4, and a slide block 14 is provided on the other side of the movable arm 4.
Roller bearings 15a, corresponding to a, 14b,
15b is provided. Slide block 14
a, 14b are the movable arms 4 from both sides of the pinion 8.
The roller bearings 15a, 15b are supported by bearing retainers 16a, 16b, and the movable arm 4 is supported by retainer plates 17a, 17b.
Pressed towards the side.

18 is a roller bearing 15 of the movable arm 4
19 is a dust cover for preventing dust from entering into the casing 1, 20a and 20b
are stoppers attached to one side and the other end of the casing 1 to restrict the range of movement of the movable arm 4, and a limit switch (not shown) for detecting the origin position is provided at a suitable location of the stopper 20a.

Reference numeral 21 denotes a slide table, on which the indexing device having the above structure is supported so as to be movable in the X and X' directions. Therefore, the movable arm 4 is constructed so that it can be easily moved and stopped at desired processing positions in the X, X' directions and the Y, Y' directions.

22 is an encoder (movement amount setting means) for setting the amount of movement of the movable arm 4;
2 is connected to the other end of the drive shaft 7 via a coupling ring 23. In addition, 24 is a brake (positioning and fixing means) for braking the rotation of the AC variable speed motor 12 and positioning and fixing the movable arm 4.
The brake 24 is connected to the AC variable speed motor 12.

The above-mentioned positioning numerical control device has the key points of controlling the coordinates of each processing position in the X, X' direction (axis) and Y, Y' direction (axis) from the start of work to the end of welding by converting them into numerical values. A two point positioner control (PTP position control device) is used.

Next, the effect will be explained. A spot welding gun is attached here as a machining device to the machining device mounting portion 5a, 5b, or 5c of the movable arm 4 of this position indexing device, and the movable arm 4
is waiting at the origin position. Then, when the positioning numerical control device is activated, the movable arm 4 moves to a predetermined first processing position, and then a work start signal is transmitted from the positioning numerical control device, and the spot welding gun is activated at the first processing position. Welding starts.

When a predetermined welding process by the spot welding gun is completed, a signal indicating the end of the work is sent to the positioning numerical control device. Then, a movement signal is transmitted from the positioning numerical control device, and the spot welding gun attached to the movable arm 4 is moved to the next second processing position. Thereafter, predetermined welding operations are carried out one after another in this manner, and when all the intended welding operations are completed, the spot welding gun returns to its original origin position and one welding cycle is completed.

(Effects of the invention) As described above, according to the invention, since the rotary drive source and the drive shaft are connected by the worm gear, the rotary drive source can be arranged side by side adjacent to the movable arm. As a result, the device itself can be made more compact than before, and the installation space can be reduced.

Further, the worm gear also functions as a transmission mechanism by setting its tooth ratio to a required value, and in this case, the structure is simple and it is more advantageous than the conventional one in terms of manufacturing costs and maintenance.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is the right side view of Fig. 1, and Fig. 3 is the A- side view of Fig. 1.
4 is a sectional view taken along the line B-B' in FIG. 3. 1...Casing, 2...Bearing, 4...
Movable arm, 5a, 5b, 5c...Machine device attachment part, 6...Rack, 7...Drive shaft, 8...Pinion, 9...Worm wheel, 12...AC variable speed motor, 12a...Output shaft Part, 13... Worm, 22... Encoder, 24... Brake.

Claims (1)

[Scope of utility model registration request] A position indexing device that is connected to a positioning numerical control device, is equipped with a machining device, and moves the machining device to a predetermined position to perform desired machining, and is slidable on a support member fixed within the casing. a movable arm supported by the movable arm and having a machine tool mounting portion; a rack attached to a side surface of the movable arm;
a drive shaft having a pinion meshing with the rack at one end; a rotational drive source connected to the drive shaft via a worm gear; and a movement amount setting means connected to the drive shaft and setting the movement amount of the movable arm. , a positioning and fixing means connected to the rotational drive source and positioning and fixing the movable arm.