JPS6250200A - Fixture for roller in cursor for rail - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 brought into elastic 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 cursor movement 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. 8 is 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, 14 and 16, 18 of the horizontal rail 4. 20 and 22 are horizontal rollers rotatably supported by the horizontal cursor 8, and their surfaces are in contact with the steel vertical rail surface 24 of the horizontal rail 4. 28.30 is a horizontal roller made of a ball bearing placed opposite to the steel vertical rail surface 26 of the horizontal rail.

Each inner ring is fitted onto the outer peripheral surface of a pair of roller support portions 32a formed on 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. Reference numeral 34 denotes a knob fixed to the lower end of the support shaft 32, and a spiral spring 36 is loosely fitted into the tube portion of this knob, and one end of the spiral spring 36 is attached to a stopper pin protruding from the knob 34. The other end of the helical spring 36 is engaged with a pin protruding from the horizontal cursor 8. The support shaft 32 is urged in a predetermined rotational direction by the elasticity of the helical spring 3G. Temporary springs 38 and 40 each have one end fixed to the upper surface of the horizontal cursor 8, and each other end is 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 on the vertical rail surface 2 of the horizontal rail 4.
The knob 34 is rotated so that it is furthest away from the rotation position 6, and the knob 34 is held in place by the leaf springs 38, 40 at the rotated position. Next, move the vertical roller 10 of the horizontal cursor 8 from one end of the horizontal rail 4 to the horizontal rail surface between 12° and 14° and 16°.
18, and horizontally facing rollers 20, 22.
, 28.30 are inserted between the vertical rail surfaces 24.26.

Next, manually lift the leaf springs 38 and 40 and turn the knob 3.
4 and release the locked state of the knob 34. As a result, each support shaft 32 of the horizontal rollers 28, 30 has a spring 3
The horizontal rollers 28, 30 are rotated by the elastic force of the rollers 6, and the horizontal rollers 28, 30 are rotated by the eccentric action of the roller support portion 32a, so that the vertical rail surface 26
The horizontal rollers 20, 22, 28, and 30 elastically contact the vertical rail surface 24 due to the reaction force of this elastic force, and the horizontal rollers 20, 22, 28, and 30 restrict the horizontal vibration of the horizontal cursor 8. The vertical rail surfaces 24 and 26 of the horizontal rail 4 are closely attached with a predetermined pressure.

Next, let go of the leaf springs 3B and 40, and release the leaf springs 38 and 40.
The open end of 40 is in elastic contact with the upper end of the knob 34, and the knob 34
is locked on the horizontal cursor 8 side. As a result, the contact pressure between the horizontal rollers 20, 22, 28, 30 and the vertical rail surface 24.26 is maintained at the initially set value, and if there is an error in the straightness of the vertical rail surface 24.26, the vertical rail Side 2
Even if the horizontal cursor 8 is located at a location where the opposing distance between the rollers 20.22 and 28.30 is wide, the distance between the horizontal rollers 20.22 and 28.30 does not increase following this vertical rail surface 24.26. In this case, if the support shaft 32 rotates and the horizontal roller 2
As the opposing distance between 0.22 and 28.30 increases,
Since the roller support shaft 32 is not reversely rotated by the roller pressure, the facing 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 pressure from the vertical rail surface 24.26 applied to the horizontal rollers 20, 22, 28.30 increases, making the movement of the horizontal cursor 8 extremely slow.

In the above embodiment, the knob 34 is connected to the leaf spring 38,
40, the mechanism for locking the knob 34 is not particularly limited to this structure.

For example, as shown in FIGS. 5 and 6, an arcuate hole 52 is provided in the knob 5o, and a screw hole 52 is positioned on the rotational trajectory of the arcuate hole 52, and a screw hole 54 is provided at the bottom of the horizontal cursor 8. A screw 56 is screwed into the screw 654, and the screw 56 is inserted into the arcuate hole 52.
It is also possible to have a structure in which it is slidably inserted.

In the above configuration, when the screw 56 is loosened from the screw hole 54, the knob 50 rotates counterclockwise in FIG. 6 due to the elasticity of the helical spring 58. In FIG. 6, when one end 52a of the arcuate hole 52 is in contact with the screw 56, the roller support portion 32a is closest to the vertical rail surface 26, and the other end 52b of the arcuate hole 52 is in contact with the screw 56. In this state, the roller support part 32a is the most vertical rail 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 described above, the present invention has the effect of being able to prevent the roller position from changing after automatically adjusting the roller position.

[Brief explanation of the drawing]

The figures show preferred embodiments of the invention, with Figure 1 being a longitudinal sectional view;
2 is a plan view, FIG. 3 is a longitudinal sectional view, FIG. 4 is a longitudinal sectional view, FIG. 5 is a longitudinal sectional view showing another embodiment, and FIG. 6 is a bottom view of the same. 8...Horizontal cursor, 10...Vertical cursor. 20.22... Horizontal roll, 211.26.
... Vertical rail surface, 28.30 ... Horizontal roller, 32 ... Roller support shaft, 32a ... Roller support part, 34 ... Knob, 36 ... Hanging spring , 38.40... Leaf spring Fig. 3 Fig. 5 Fig. 52 ':) U cob Fig. 4 Fig. 6

Claims (1)

[Claims] (1) Rotatably attach the roller support shaft 32 to the cursor 8,
The roller support shaft 32 is formed with a roller support portion 32a that is eccentric with respect to its rotation center axis, and the roller 3 is attached to the roller support portion 32a.
0 is rotatably fitted, the roller support shaft 32 is biased in the rotational direction by a spring 36, and the roller support shaft 32 is releasably locked to the cursor 8. Roller mounting device for rail cursor.