JP2577172Y2 - Bearings for square shafts - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for a square shaft which slidably supports a square shaft.

[0002]

2. Description of the Related Art FIG. 5 shows an example of an application form of a rectangular shaft. This device has an X-axis motor M in three X-, Y-, and Z-axis directions.
_X , Y-axis motor M _Y , and Z-axis motor M _Z
Number of motor M _X, M _Y, finally moving base 1 by M _Z
0 is moved to an arbitrary position on the X-Y coordinate, and at this movement position, the Z-axis moving table 11 is moved in the Z-axis direction (up-down direction). Work such as aspirating and dispensing reagents and the like into test tubes.

[0003] Here, the square shaft supports a Z-axis moving table 11 without rotating the shaft 12 and moves the Z-axis moving table 11 in the Z-axis direction. And a drive shaft 13 that transmits a rotational driving force to the movable base 10 to drive the moving table 10 up and down. The shafts 12 and 13 are slidably supported by bearings made of a resin material having a small friction coefficient such as a Duracon. FIG. 4 shows the structure of a conventional bearing. In the drawing, reference numeral 20 denotes a bearing formed of a resin material having a small friction coefficient such as Duracon. In a conventional bearing, a rectangular through-hole 21 is formed through a block body made of a resin material, and a rectangular shaft is inserted into the rectangular through-hole 21 to slidably support the same. The bearing 20 is accommodated in a bearing support hole 23 formed in the bracket 22 and is supported by being tightened with a retaining screw 24.

[0004]

The rectangular through-hole 21 is formed in accordance with the angular dimensions of the square shafts 12 and 13. However, since the rectangular through-hole 21 is troublesome to process, the rectangular through-hole 21 is formed.
Since it is difficult to support the 2 and 13 without backlash, there is a disadvantage that the accuracy of the stop position is poor and a disadvantage that the manufacturing cost is increased. In addition, when the bearing is worn during practical use, play occurs, but there is also a disadvantage that the play cannot be corrected to eliminate the play.

[0005]

SUMMARY OF THE INVENTION According to the invention, a square chassis is provided.
Shaft bearing is a shaft of a bracket formed by a rigid body.
The outer peripheral surface is made of a resin material with a small friction coefficient
The block formed on the cylindrical surface is supported, and
A square through-hole is formed through the hook body, and this square through-hole
Square shape configured by slidably supporting a square shaft
In the shaft bearing, the axial direction of the block
In the middle, opposite to each other from one corner of the square through hole
Along the circumferential direction, a sleeve formed to reach the inner and outer peripheral surfaces
And one side in the axial direction with respect to the slit
In one of the square through holes,
A slot that is formed at one end of the
Screw inward from the outer circumference of the slot,
Reciprocating perpendicular to the two inner surfaces of the through hole
Adjusting screws for adjusting the gap between the
Screw inward from the outer circumference of the bracket to the inside.
Secure the block body to the bracket on the other side of the
And fastening screws.

According to the configuration of the present invention, since the gap between the inner wall of the rectangular through hole and the rectangular shaft can be adjusted by the adjusting screw, the size of the rectangular through hole does not need to be accurately finished to match the size of the rectangular shaft. Can also be corrected and adjusted to an appropriate state. Also, the tightening force of the retaining screw
A structure that does not interfere with the elastic deformation part
You.

[0007]

EXAMPLES Figure 1 by that square shaft bearing in this invention
Some structures are shown. In the present invention, a slot 25 is formed along one corner of the rectangular through hole 21 through which the rectangular shaft is inserted, and elastically deformable portions 26A and 26B which can be elastically deformed by the formation of the slot 25 are provided.

The bracket 22 has adjusting screws 27A, 27 for pressing and biasing the elastically deformable portions 26A, 26B.
B is screwed. The positions where the adjustment screws 27A and 27B are provided are screwed to the bracket 22 so as to advance and retreat in a direction perpendicular to the two surfaces of the rectangular through hole 21 which is in contact with the corner where the slot 25 is formed. By pressing and biasing the elastically deformable portions 26A and 26B by the adjusting screws 27A and 27B, the elastically deformable portions 26A and 26B are elastically deformed inward as shown by the dotted lines as shown in the enlarged view of FIG. A force in a direction indicated by an arrow P can be applied to a square shaft (not shown) inserted into the shaft 21. As a result, the square shaft is supported in the square through hole 21 without play.

When the adjusting screws 27A and 27B are provided so as to face two mutually parallel surfaces of the rectangular through-hole 21, play can be suppressed in the direction in which the adjusting screws 27A and 27B are sandwiched. Adjustment screws 27A and 27B
There is an inconvenience that the play in the direction orthogonal to the direction of the pinch cannot be removed. Figure 3 shows the actual施例of this invention. In this example, the formation position of the slot 25 is stopped to a position about half of the length direction of the bearing 20, and the other half is left in an annular shape.
And slits 29A and 29B are formed in the circumferential direction from the tip of the slit 25, and the slits 29A and 29B are formed.
Shows a case where elastically deformable portions 26A and 26B are provided.

In the case of the structure shown in FIG. 3, the retaining screw 24 for fixing the bearing 20 to the bracket 22 is formed by an annular portion 28.
Therefore, the elastically deformable portions 26A and 26B are not pressed and deformed by the tightening force of the retaining screw 24. Therefore, a structure in which the tightening force of the retaining screw 24 does not interfere with the adjustment state of the adjusting screws 27A and 27B can be achieved.

[0011]

As described above, according to the present invention, the elastically deformable portion 26 is adjusted by the adjusting screws 27A and 27B.
A, 26B is pressed to adjust the size of the rectangular through-hole 21, so that it is not necessary to manufacture the bearing 20 with high precision.
The square shaft can be supported without play. Further, even if the bearing 20 is worn during use and the backlash of the square shaft is generated, the state can be set again without play by adjusting the adjusting screws 27A and 27B. Therefore, the device using the square shaft can be operated stably for a long time. Further, since it is not necessary to adopt a high processing accuracy at the time of manufacturing the bearing 20, the processing of the bearing 20 becomes easy. Therefore, there is also an effect that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a part of an embodiment of the present invention .

FIG. 2 is an enlarged plan view for explaining the operation of the present invention.

Figure 3 is a perspective view showing an actual施例of this invention.

FIG. 4 is an exploded perspective view for explaining a conventional technique.

FIG. 5 is a perspective view for explaining a practical example of a square shaft.

[Explanation of symbols]

 Reference Signs List 20 bearing 21 rectangular through hole 22 bracket 23 bearing support hole 24 retaining screw 25 slot 26A, 26B elastically deformable portion 27A, 27B adjusting screw

Claims (1)

(57) [Scope of request for utility model registration] 1. A. First Embodiment The bearing support hole of the bracket formed by a rigid, outer peripheral by a low coefficient of friction resin material
A block body having a cylindrical surface is supported, and a rectangular through hole is formed through the block body, and a rectangular shaft bearing configured to slidably support a rectangular shaft in the rectangular through hole is provided. B. At the intermediate part in the axial direction of the block body,
From one corner of the rectangular through hole, in the circumferential direction opposite to each other
B. a slit formed so as to reach the inner and outer peripheral surfaces along the inner periphery; One side in the axial direction with respect to the slit
At the one corner of the square through hole,
From the bottom to the end face of the block body.
Re-division, D. Screwed toward the inside from the outer periphery of the bracket, and moved in the direction perpendicular to the two inner surfaces of both sides of the rectangular through-hole of the slitting, to adjust the gap between the upper SL bearing the square shaft E. two adjustment screws; Screw the bracket inward from the outer circumference and
On the other side of the slit, insert the block
A bearing for a square shaft composed of a retaining screw fixed to the bracket .