JPH0253653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an actuator used in, for example, automatic drafting machines, automatic cutting machines, and the like.

[Technical background of the invention and its problems]

Traditionally, for example, when drawing straight lines, circles, curves, etc. during design and drafting work,
This is often done using a designated ruler, compass, etc.

However, this method requires a lot of effort when making a wide variety of drawings.
It takes time too.

[Purpose of the invention]

The present invention aims to solve the above-mentioned problems, and aims to make it possible to easily and quickly perform linear motion, circular motion, and curved motion that is a combination of these motions. .

[Summary of the invention]

The actuator of the first invention includes a frame, a pair of wormshafts supported rotatably in parallel with each other on the frame, and a rotational direction of each of the pair of wormshafts. and a drive source capable of converting the number of revolutions, a worm wheel disposed between the pair of worm shafts so as to be movable along the axial direction and meshed with the pair of worm shafts, and an eccentric position of the worm wheel. The output shaft is characterized by having an output shaft provided therein, and by controlling the rotational direction and rotation speed of each of the pair of wormshafts, the output shaft can perform linear motion, curved motion, and a composite motion thereof. be.

Moreover, the second invention is characterized in that it further includes an eccentricity variable mechanism that adjusts the eccentricity of the output shaft with respect to the worm wheel, so that the range of motion of the output shaft can be varied.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a frame, and the frame 1 includes a plurality of supporting plates 2 facing each other in parallel and integrally connected by a plurality of connecting rods 3.

A pair of worm shafts 5a and 5b are rotatably supported in parallel to each other between a pair of support plates 2 of the frame 1, which are opposed to each other at a predetermined interval, via bearings 4. Also, a support plate 2 on one side of the frame 1 is provided.
Two motors 6a, 6b that can convert the rotational direction and rotational speed are provided as drive sources on the outside of the 8a, 8b
are meshed with gears 9a and 9b attached to one end of each of the wormshafts 5a and 5b. Then, one motor 6a rotates the rotating shaft 7a and the gear 8.
One of the wormshafts 5a is rotated via the motors a and 9a, and the other wormshaft 5b is rotated by the motor 6b of the other via a rotating shaft 7b and gears 8b and 9b.

Guide rods 11 are provided in parallel between the pair of opposing support plates 2 of the frame 1 at the upper and lower portions of the wormshafts 5a, 5b, and guide grooves 12 are formed along the inner side of each guide rod 11.

13 is a substantially cylindrical actuating body;
The above-mentioned pair of worm shafts 5 are attached to the intermediate outer peripheral part of
A worm wheel 14 that meshes with the actuating body 13 is integrally formed, and an annular bearing body 15 that engages with the guide groove 12 of the guide rod 11 is provided on the upper and lower outer peripheries of the actuating body 13. An output shaft 16 protruding downward is fixed at an eccentric position 13. The operating body 13 is disposed between the pair of worm shafts 5a and 5b, and the upper and lower bearing bodies 15 are connected to the guide grooves 11 in the upper and lower guide rods 11 on both sides.
2 so as to be slidable in the axial direction,
A worm wheel 14 is engaged with a pair of worm shafts 5a and 5b on both sides.

Next, the operation will be explained.

(A) When the two motors 6a and 6b are driven in the same direction and at the same speed, and the pair of wormshafts 5a and 5b are rotated in the same direction and at the same speed, the worm wheel 14 does not rotate and the bearing The output shaft 16 moves in the lateral direction while being guided by the guide groove 12 of the guide rod 11 through the body 15, and the output shaft 16 performs linear motion. And motor 6
The output shaft 16 is moved in either the left or right direction by synchronously selecting the driving direction of the worm shafts a and 6b, that is, the rotation direction of the pair of worm shafts 5a and 5b.

(B) Two motors 6a, 6b are driven in opposite directions at the same speed, and a pair of worm shafts 5a, 5 are driven.
When the motors b are rotated in different directions and at the same rotational speed, the worm wheel 14 rotates at that position, and the output shaft 16 performs rotational movement. The driving direction of the motors 6a and 6b, that is, the pair of worm shafts 5
By synchronously selecting the forward or reverse rotation direction of a and 5b, the output shaft 16 moves circularly in a clockwise or counterclockwise direction.

(C) When the two motors 6a, 6b are driven in the same direction or in opposite directions at different speeds, and the pair of wormshafts 5a, 5b are rotated at different speeds, the worm wheel 14 moves in the same direction as described above. Performs a curved motion that is a combination of rotational motion. By synchronously selecting the driving direction of the motors 6a and 6b, that is, the rotation direction of the pair of wormshafts 5a and 5b, as described above, the output shaft 16 is rotated in either the left or right direction while making a circular motion. Move to.

Next, other embodiments will be described with reference to FIGS. 4 to 6.

This embodiment basically has the same configuration as the embodiment shown in FIGS. 1 to 3, and further includes:
It is equipped with an eccentricity variable mechanism that adjusts the amount of eccentricity of the output shaft with respect to the worm wheel, and parts corresponding to those in FIGS. 1 to 3 are given the same reference numerals and explanations will be omitted.

A variable eccentricity mechanism 21 for the output shaft 16 is provided below the operating body 13 . In the variable eccentricity mechanism 21, a base plate 23 is fixed to the lower center of the operating body 13 via a support rod 22, and a frame 24 is fixed to the lower surface of the base plate 23. This frame 2
4, a plurality of support plates 25 facing each other in parallel are integrally connected by a plurality of connecting rods 26.

A pair of worm shafts 28a and 28b are rotatably supported in parallel to each other between a pair of support plates 25 of the frame 24, which are opposed to each other at a predetermined interval, via bearings 27. Further, a motor 29 capable of converting the rotation direction and rotation speed is provided as a drive source on the outside of the support plate 25 on one side of the frame 24,
A gear 31 is attached to a rotating shaft 30 of this motor 29, and this gear 31 connects each wormshaft 2 to the other.
Gears 32a, 32 attached to one end of 8a, 28b
It is meshed with b. The motor 29 rotates a pair of worm shafts 28a and 28b via a rotating shaft 30 and gears 32a and 32b.

A pair of opposing support plates 25 of the frame 24
Guide rods 33 are provided in parallel between the upper and lower parts of the wormshafts 28a and 28b, and guide grooves 34 are formed along the inner side of each guide rod 33.
is formed.

35 is a substantially cylindrical moving body;
The pair of worm shafts 28 are attached to the intermediate outer circumference of the
A worm wheel 36 that engages with the guide rods 33a and 28b is integrally formed, and an annular bearing body 37 that engages with the guide groove 34 of the guide rod 33 is provided on the upper and lower outer periphery of the movable body 35. An output shaft 16 protruding downward is fixed at the center position of 35. The moving body 35 has a pair of worm shafts 28a, 28.
The upper and lower bearing bodies 37 are fitted in the guide grooves 34 of the guide rods 33 on both sides of the upper and lower parts so as to be slidable in the axial direction, and the worm wheel 36 is disposed between the pair of worm shafts 28a on both sides. , 28b.

Then, when the motor 29 is driven to rotate the pair of wormshafts 28a and 28b in the same direction and at the same rotation speed, the wormwheel 36 does not rotate and guides the guide rod 33 through the bearing body 37. It moves while being guided by the groove 34, and the output shaft 16 moves linearly. and,
By selecting the driving direction of the motor 29, that is, the rotation direction of the pair of worm shafts 28a and 28b, the output shaft 16 is moved in either direction. With this, the output shaft 16 is connected to the actuating body 1.
The worm wheel 1 of the actuating body 13 is moved in the diametrical direction including the coaxial point with respect to the central support shaft 22 of the actuating body 13.
The desired eccentric position at 4 is set.

For example, when used as an automatic drafting machine, a pen may be attached to the output shaft 16, and when used as an automatic cutting machine, a cutter such as a knife, a laser light source, an electrode, etc. may be attached to the output shaft 16.

In each of the above embodiments, the output shaft 16 is projected downward to perform flat work, but in actual practice, the output shaft 16 may be arranged upward or sideways. Can also be used for various equipment,
It can be used for devices.

Further, in implementation, the motors 6a and 6b may be of any type as long as the rotational direction and rotational speed can be electrically controlled, and for example, a pulse motor or a DC servo motor is used.

〔Effect of the invention〕

According to the present invention, by controlling the rotational direction and rotation speed of a pair of wormshafts, the output shaft is caused to perform linear motion, circular motion, and curved motion that is a combination of these motions via the wormwheels meshed with the pair of wormshafts. Various movements can be obtained by controlling the drive source.

In addition, by adjusting the amount of eccentricity of the output shaft with respect to the worm wheel using the variable eccentricity mechanism of the output shaft, it is possible to perform circular motion and curved motion according to the amount of eccentricity, making it possible to obtain even more diverse movements. .

Therefore, it can be widely used in automatic drafting, automatic cutting, etc., and has a simple mechanism and can be provided at low cost.

[Brief explanation of the drawing]

1 is a partially cutaway bottom view showing an embodiment of the actuator of the present invention, FIG. 2 is a sectional view of the section shown in FIG. 1, and FIG. 3 is a sectional view of the section shown in FIG. FIG. 4 is a partially cutaway bottom view showing another embodiment of the actuator of the present invention, and FIG.
FIG. 6 is a sectional view of the section shown in FIG. 4. 1... Frame, 5a, 5b... Wormshaft, 6a, 6b... Motor as a driving source, 1
4... Worm wheel, 16... Output shaft, 21
...Variable eccentricity mechanism.

Claims (1)

[Scope of Claims] 1. A frame, a pair of wormshafts rotatably supported in parallel with each other on the frame, and a rotation direction and rotation of each of the pair of wormshafts. a worm wheel disposed between the pair of worm shafts so as to be movable along the axial direction thereof and meshed with the pair of worm shafts; and a worm wheel disposed at an eccentric position of the worm wheel. An actuator characterized by having an output shaft with an output shaft and an output shaft. 2 a frame, a pair of wormshafts rotatably supported on the frame in parallel with each other, and a drive capable of rotationally driving the pair of wormshafts and converting the rotation direction and rotation speed of each of the pair of wormshafts. a worm wheel disposed movably along the axial direction between the pair of worm shafts and meshed with the pair of worm shafts; an output shaft provided on the worm wheel; An actuator comprising: an eccentricity variable mechanism that adjusts an eccentricity with respect to the worm wheel;