JPH0628397U - Linear motion device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the manufacturing cost of linear motion devices. [Structure] Roller holder 10 that constitutes the main body of a linear motion device
The two rollers 12 and 14 are mounted rotatably and inclined with respect to the drive shaft 16 which is loosely fitted in the roller holder 10. When the concave surfaces 26 formed on the surfaces of the two rollers 12 and 14 are pressed against the drive shaft 16 at two points, respectively, and the drive shaft rotates, the shaft 16 is rotated.
The roller holder 2 and the carriage 4 move in a linear direction along.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear motion device that converts the rotation of a shaft into a balanced linear motion.

[0002]

[Prior art]

 The conventional bearing type linear motion device uses six ball bearings set in the main body, and the frictional force between the drive shaft and the ball bearing converts the rotational movement of the drive shaft into the linear movement of the main body. I'm going.

[0003]

[Problems to be solved by the device]

 The use of six ball bearings raises the cost and the shape of the device body is specified. The present invention is intended to solve the above problems.

[0004]

[Means for solving problems]

 In order to achieve the above-mentioned object, the present invention comprises a roller holder on which a shaft is loosely fitted, and two rollers having concave portions formed on the surface thereof are tilted with respect to the shaft and are rotatably attached. Two points on each surface of each roller are pressed against the shaft, and the rotational movement of the shaft is converted into the linear movement of the roller holder by the frictional force between the shaft and the two rollers. It was done.

[0005]

[Action]

 When the shaft rotates, the roller holder moves linearly along the shaft due to the frictional force between the pair of rollers and the shaft.

[0006]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a linear guide, on which a carriage 4 is supported so as to be linearly movable along guide rails 6 and 8 fixed to the linear guide 2.

A roller holder 10 is fixed to the carriage 4. A pair of upper and lower rollers 12 and 14 are rotatably supported on the roller holder 10 in a rotatable manner. Reference numeral 16 is a shaft, and both ends of the shaft are rotatably supported by bearings 18 and 20 fixed to the linear guide 2.

One end of the shaft 16 is connected to an output shaft of a motor 24 fixed to the linear guide 2 via a coupling 22. The support shafts of the rollers 12, 14 are inclined with respect to the shaft 16, and the surfaces of the rollers 12, 14 are in pressure contact with the shaft 16.

In order to secure the engagement between the rollers 12 and 14 and the shaft 16, a curved concave surface 26 is formed on the surface of the rollers 12 and 14, and the concave surface 26 is formed on the shaft. Two points are in contact with the outer peripheral surface of 16, as indicated by P1 and P2 in FIG.

As shown in FIGS. 8 and B, the surface of the rollers 12 and 14 may be a V-shaped concave surface 28, which may be in contact with the outer peripheral surface of the shaft 16 at two points. As shown in FIG. 8C, the U-shaped concave surface 30 may be in contact with the outer peripheral surface of the shaft 16 at two points. A hole for loosely fitting the shaft is formed in the roller holder 10.

In the above structure, when the shaft 16 is rotated by driving the motor 24, a thrust force is generated in the roller holding body 10 by a frictional force between the shaft 16 and the rollers 12 and 14, and the carriage 4 is moved by the thrust force. , Move along the linear guide 2 in the straight line direction.

In the above embodiment, the rollers are arranged vertically on the roller holder 10, but a pair of rollers 32 and 34 may be arranged on the left and right on the roller holder 36 as shown in FIGS. 4 to 7. Alternatively, as shown in FIG. 9, a pair of rollers 40 and 42 may be arranged on the oblique line of the roller holder 38.

As described above, by varying the arrangement position of the pair of rollers, the roller holder can be formed in any shape such as vertically long and horizontally long.

[0014]

【effect】

 Since the present invention reduces the number of rollers as described above, there is an effect that the cost can be reduced and the roller holder can have any shape.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view.

FIG. 2 is an explanatory side view.

FIG. 3 is an explanatory external view.

FIG. 4 is an explanatory sectional view showing another embodiment.

FIG. 5 is a sectional view of the same.

FIG. 6 is a plan view of the same.

FIG. 7 is a side view of the same.

FIG. 8 is a front view of a roller.

FIG. 9 is an explanatory sectional view showing another embodiment.

[Explanation of symbols]

 2 Linear guide 4 Carriage 6 Guide rail 8 Guide rail 10 Roller holder 12 Roller 14 Roller 16 Shaft 18 Bearing 20 Bearing 22 Coupling 24 Motor 26 Curved concave surface 28 Concave surface 30 Concave surface 32 Roller 34 Roller 36 Roller holder 38 Roller holder 40 roller 42 roller

Claims (1)

[Scope of utility model registration request] 1. A roller holder, on which a shaft is loosely fitted, is provided with two rollers having concave portions formed on the surface so as to be tilted with respect to the shaft and rotatably mounted, and Two points are pressed against the shaft, and the rotational movement of the shaft is converted into the linear movement of the roller holder by the frictional force between the shaft and the two rollers. .