JPS61140665A - Straight linear moving device - Google Patents

Abstract

PURPOSE:To make it possible to use a small type motor by forming either or both of a pair of synchronous driving pulleys or of synchronous pulleys of synchronous driving pulleys or a synchronous pulleys having different diameter mutually. CONSTITUTION:In a straight linear moving device having a pair of moving bodies 11a, 11b with pulleys 13a, 13b, the both sides of a pair of synchronous pulleys 17a, 17b over which a synchronous belt 6 is put are provided with guide rollers 18a, 18b, 18c and 18d. The synchronous pulleys 17a, 17b coaxially have synchronous driving pulleys 19a, 19b respectively, and the synchronous driving pulley 19a is smaller in diameter tan the synchronous driving pulley 19b. Consequently, the synchronous pulley 17a is greater in rotating angle than the synchronous pulley 17b mounted coaxially with the synchronous driving pulley 19b, and the above the angular difference forms the moving amount of the moving bodies 11a, 11b. The low torque type of a motor can be therefore used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an improvement in a linear movement device used in industrial robots and the like. A conventional device of this kind, which is the object of the improvement of the present invention, will be explained with reference to FIG. 1α, 1b are a pair of movable bodies fixed to both ends of a pair of guide shafts 2α, 2b arranged in parallel, and have pulleys 3α, Sb that can rotate freely once. 4 (1% 4b is the mounting surface of the object. 5 is the base body slidably attached to the guide shaft 2g*2A, and the toothed drive pulley 7 on which the toothed belt 6 is engaged is provided. The belt 6 is engaged with a pair of guide rollers 8α, 8h provided on both sides of the toothed drive pulley 7, extends parallel to the guide shaft 2a, and is engaged with pulleys 3α, 5b.

In the above configuration, when the toothed drive pulley 7 is driven in the direction of the arrow by a motor (not shown), the moving body 1cL,
1b moves in the direction of the arrow around the fixed base 5, and the amount of movement is determined by the rotation angle of the toothed drive pulley 7. However, in the above-mentioned conventional device, the drive motor requires high torque at a low rotation speed, making it large and expensive, and also requires a high flE encoder, etc. to ensure positional accuracy. There are drawbacks. It is an object of the present invention to provide a linear movement device having a structure that does not have such drawbacks, that is, a structure that allows the use of a small and inexpensive motor and that allows for rectilinear movement with precision. It is something.

[Structure of the Invention] The linear movement device of the present invention has a pair of guide shafts mounted on a base body, each of which has a rotatable pulley attached to a pair of movable bodies fixed to both ends of a pair of guide shafts arranged in parallel. A pair of toothed pulleys are attached to a base that is slidably attached to the base, and a pair of toothed pulleys are attached to the base that are slidably attached to a pair of guide shafts on each side of the pulley, and a toothed pulley is attached between the toothed pulley and the guide pulley. A toothed belt is installed, a pair of toothed drive pulleys are installed coaxially with the pair of (support) pulleys, and the toothed belt is installed between the pair of toothed drive pulleys, and one of the teeth In a structure in which a rotating shaft of a drive pulley is coupled to a drive motor, either or both of the pair of toothed drive pulleys or the pair of toothed pulleys are toothed drive pulleys having different diameters. Alternatively, it is characterized by being configured by a toothed pulley.

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 11α and 11b are a pair of movable bodies fixed to both ends of a pair of parallel guide shafts 12cL and 12IJ, and have pulleys 13α and 13b that can rotate freely once. 1
4α and 14h are mounting surfaces of the object. 15 is guide shaft 1
2α.

It is a base body slidably attached to 12A, and has a pair of toothed pulleys 17α and 17b on which the toothed belt 1- is engaged. A pair of guide rollers 18α, 18b and 18C118d are provided on both sides of the toothed pulleys 17α, 17b. The toothed belt 16 that meshes with the toothed pulley 17α extends parallel to the guide shaft 12α while being engaged with the kite rollers i9a and 18b, and is engaged with the pulleys 13a and 13b so that the guide shaft 1
2A] W is engaged with the guide rollers 18C and 18d and meshes with the toothed pulley 17A. As shown in FIG. 2, the toothed pulley 178% 17A has toothed drive pulleys 19α and 19b coaxially therewith, respectively.

A toothed belt 20 is installed between the toothed drive pulleys 19a and 19A. Note that the toothed drive pulley 19α has a smaller diameter than 19A.

21 is a drive motor.

Next, its effect will be explained. When the drive motor 21 is driven, the toothed drive pulleys 19a, 1qb and the toothed pulley 17a provided coaxially therewith.

17h rotates. Since the diameter of the toothed drive pulley 19α is smaller than that of the toothed drive pulley IJ 19 b, the toothed pulley 17α provided coaxially therewith is smaller in diameter than the toothed drive pulley IJ 19 b
Its rotation angle is larger than that of the toothed boob IJ 17 b, which is provided coaxially with the toothed boob IJ 17 b. Since the toothed pulleys 17α and 17b have different amounts of feed of the toothed belt 16 due to the difference in rotation angle, the difference becomes the amount of movement of the movable bodies 11α and 11A. In addition, in the above embodiment, the toothed drive pulleys 19α, 19A
However, the toothed drive pulleys 19α and 19.6 were made to have the same diameter, and the toothed pulley 17a%
17A may have a different diameter, or both may have different diameters.

[Effects of the Invention] Since the device of the present invention has the above-described configuration and operation, it is possible to use a high speed, low torque, and inexpensive motor as the drive motor 21, and to perform highly accurate control. Therefore, it has the effect of achieving the purpose of the invention.

Further, since the amount of linear feed per revolution of the motor can be freely determined regardless of the diameter of the toothed pulley, it has many excellent effects such as being advantageous in terms of design.

[Brief explanation of the drawing]

Fig. 1: A sectional view of an embodiment of the linear movement device of the present invention Fig. 2: A side view of toothed pulleys 17α, 17b and toothed drive pulleys 19α, 19bo11111 Fig. 3: Connection of toothed drive pulleys 19α, 1jib Figure 4: Cross-sectional view of a conventional linear moving device 1α, 1b...Moving body% 2α, 2b...Guide shaft. Lo α, 3b...Pulley, 4α, 4b...Mounting surface. 5...Base body, 6...Toothed belt, 7...Toothed drive pulley, 8α, 8b...Guide roller, 9αS 9b
... Fastener (see Figure 4 above) 11α, 11b... Moving body, 12α, 126... Guide shaft, 15α 113b...-Pulley. 14α, 14b...Mounting surface, 15...Base, 16.
...Toothed belt% 17α, 17b...Toothed pulley,
18α, 18jS, 18C, 18d...Guide roller, 19α, f91I...Q attached moving pulley, 20...
Toothed belt, 21... Drive motor (see Figures 1 to 3 above) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 fixed to both ends of a pair of guide shafts arranged in parallel
Each of the pair of moving bodies is provided with a rotatable pulley, and
A pair of toothed pulleys are rotatably provided on a base body slidably attached to a pair of guide shafts, and a pair of guide rollers are rotatably provided on each side of the toothed pulleys, and between the pair of pulleys, the toothed pulley, and the guide pulley. A toothed belt is installed on the belt, a pair of toothed drive pulleys are provided coaxially with the pair of toothed pulleys, and this one
In a structure in which a toothed belt is installed between a pair of toothed drive pulleys and the rotating shaft of one of the toothed drive pulleys is coupled to a drive motor, the pair of toothed drive pulleys or one
A linear movement device characterized in that one or both of the pair of toothed pulleys are constituted by toothed drive pulleys or toothed pulleys having different diameters.