JPH0443520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller mounting device for elastically bringing the rollers into close contact with a rail surface in a cursor movably mounted on a rail via rollers.

Conventionally, when the rollers of a cursor are elastically brought into contact with the rail surface, the rollers are configured so that they do not retreat in the direction of escaping pressure from the rail surface, so there is no error in the straightness of the rail surface. If so, the pressure on the rail surface of the roller would increase, making the movement of the cursor slow.

The present invention aims to eliminate the above-mentioned defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a drawing board, and 4 a horizontal rail of a rail type universal parallel ruler, which is fixed to the drawing board 2 with a vise-type fixture 6. Reference numeral 8 denotes a horizontal cursor, and the surfaces of three vertical rollers 10 rotatably attached to the horizontal cursor are inserted between the horizontal rail surfaces 12 and 14 and between the horizontal rail surfaces 16 and 18 of the horizontal rail 4. 20,2
Reference numeral 2 denotes a horizontal roller rotatably supported by the horizontal cursor 8, and the surfaces of these rollers are in contact with the steel vertical rail surface 24 of the horizontal rail 4. 28 and 30 are horizontal rollers made of ball bearings arranged opposite to the steel vertical rail surface 26 of the horizontal rail;
Each inner ring is fitted onto the outer peripheral surface of a roller support portion 32a that is integrally formed with the roller support shaft 32, as shown in FIG. The center of the horizontal cross-sectional circle of the roller support portion 32a is eccentric by a predetermined amount with respect to the center of the horizontal cross-sectional circle of the support shaft 32. The roller support shaft 32 is rotatably fitted into the tube portion of the horizontal cursor 8. 34 is a knob fixed to the lower end of the support shaft 32;
A helical spring 36 is loosely fitted into this tube, one end of the helical spring 36 engages with a stopper pin protruding from the knob 34, and the other end of the helical spring 36 is connected to the horizontal cursor 8. It is engaged with a pin protruding from. The support shaft 32 is urged in a predetermined rotational direction by the elasticity of the helical spring 36. Denoted at 38 and 40 are leaf springs whose one end is fixed to the upper surface of the horizontal cursor 8, and whose other ends are in elastic contact with the upper end of the rising portion of the knob 34.

Next, the operation of this embodiment will be explained.

When installing the horizontal cursor 8 on the horizontal rail 4, first, the horizontal rollers 28 and 30 are attached to the horizontal rail 4.
Rotate the knob 34 so that it is furthest away from the vertical rail surface 26 of the leaf springs 38, 4.
0, the knob 34 is locked. Next, from one end of the horizontal rail 4, move the vertical roller 10 of the horizontal cursor 8 between the horizontal rail surfaces 12, 14 and 16, 18.
In addition to inserting and arranging the horizontal rollers 20, 2
2, 28, 30 are inserted between the vertical rail surfaces 24, 26. Next, the leaf springs 38, 40 are manually lifted away from the knob 34, and the leaf springs 38, 40 are moved away from the knob 34.
Release the locked state. As a result, each support shaft 32 of the horizontal rollers 28, 30 is rotated by the elasticity of the spring 36, and the horizontal rollers 28, 30 are moved to a predetermined position on the vertical rail surface 26 by the eccentric action of the roller support portion 32a. The horizontal rollers 20, 22 come into elastic contact with the vertical rail surface 24 due to the elastic contact force, and a reaction force to this elastic contact force causes the horizontal rollers 20, 22, 28, 3 to come into elastic contact with the vertical rail surface 24.
0 is in close contact with the vertical rail surfaces 24 and 26 of the horizontal rail 4 with a predetermined pressure to restrict the horizontal vibration of the horizontal cursor 8. Next, the user releases the leaf springs 38 and 40, and the open ends of the leaf springs 38 and 40 come into elastic contact with the upper end of the knob 34, thereby locking the knob 34 on the side of the horizontal cursor 8. As a result, the horizontal rollers 20, 22,
The contact pressure between 28, 30 and the vertical rail surfaces 24, 26 is maintained at the initially set value. Even if the horizontal cursor 8 is located in a wide area, this vertical rail surface 24, 26
The distance between the horizontal rollers 20, 22 and 28, 30 does not increase as a result of this. In this case, if the spindle 32 rotates and the horizontal rollers 20, 22 and 28
30 increases, the roller support shaft 3
2 is not reversely rotated by roller pressure, the opposing distance between the rollers 20, 22 and 28, 30 remains increased, so that the horizontal cursor 8 is aligned with the vertical rail surface 24 of the horizontal rail 4, 26, the sideways rollers 20, 2
2, 28, 30 vertical rail surfaces 24, 26
The pressure from the horizontal cursor 8 increases, and the movement of the horizontal cursor 8 becomes extremely slow.

In the above embodiment, the knob 34 is releasably locked by the leaf springs 38, 40, but the mechanism for locking the knob 34 is not particularly limited to this structure. For example, Figures 5 and 6
As shown in the figure, a knob 50 is provided with an arcuate hole 52, positioned on the rotation locus of the arcuate hole 52, and a screw hole 54 is formed at the bottom of the horizontal cursor 8. A structure may be adopted in which the screw 56 is screwed together and the screw 56 is slidably inserted into the arcuate hole 52.

In the above configuration, the screw 56 is inserted into the screw hole 54.
When loosened, the knob 50 rotates counterclockwise in FIG. 6 due to the elasticity of the helical spring 58. In FIG. 6, one end 52a of the arcuate hole 52
When the roller support portion 32a is in contact with the screw 56, the roller support portion 32a is closest to the vertical rail surface 26, and when the other end 52b of the arcuate hole 52 is in contact with the screw 56, the roller support portion 32a is closest to the vertical rail surface Surface 26
It is set to move away from the Although the above is an example of the horizontal rail and horizontal cursor of a rail-type adjustable parallel ruler, the configuration of this example can also be used for the vertical rail and vertical cursor.

As is clear from the above description, the leaf spring 38,
40 and knob 34, and knob 50 and arcuate hole 52
and the screw 56 constitute a locking mechanism for locking the roller support shaft 32 to the cursor 8 at a desired rotation angle.

Since the present invention is constructed as described above, the rollers can be easily brought into close contact with the rail with stable pressure by the rotational force of the springs, and the roller position can be adjusted.Moreover, this roller position can be prevented from changing. There are effects that can be prevented.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view, FIG. 3 is a longitudinal sectional view, FIG. 4 is a longitudinal sectional view, and FIG. FIG. 6 is a longitudinal sectional view showing an example, and FIG. 6 is a bottom view. 8...Horizontal cursor, 10...Horizontal roll, 2
0, 22... Horizontal roller, 24, 26... Vertical rail surface, 28, 30... Horizontal roller, 32... Roller support shaft, 32a... Roller support part, 34... Knob, 36... Hanging spring , 38, 40... leaf spring.

Claims (1)

[Claims] 1. A roller support shaft 32 is rotatably attached to the cursor 8, a roller support portion 32a eccentric to the rotation center axis is formed on the roller support shaft 32, and a roller 30 is rotatably fitted to the roller support portion 32a. The roller support shaft 32 is provided with springs 36 and 58 for applying rotational force to the roller support shaft 32, and a locking mechanism is provided for locking the roller support shaft 32 to the cursor 8 at a desired rotation angle. Roller mounting device for rail cursor.