JPH0515618Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a precision holding device for a movable member, and more particularly to the structure of a device that supports the movable member while guiding its linear movement.

(Prior Art) As is well known, in the case of, for example, the optical system of a copying machine, the scanning system of a facsimile machine, or the print head of a printer, a reflecting mirror, a recorder, or a print head are connected to a rail member installed on the machine body. It is carried out to move linearly along the line.

The structure that controls this movement is as follows:
As shown in Figs. 3 and 4, there is a type in which guide support members made of round bars are used as rail members.

That is, in FIG. 3, a movable member B is located near a guide support member A made of a round bar.

A support shaft C is screwed to this movable member B near the upper end of its front face _B1 , and to this support shaft C,
Umbrella-shaped rollers D are rotatably supported, with their small diameter end faces facing each other.

This umbrella-shaped roller D guides and supports the peripheral surface of the support member A.
The guide support member A is placed on the guide support member A by contacting the upper half circumferential surface of the guide support member A.

On the other hand, another support shaft E is screwed to the lower end of the front surface B ₁ of the movable member B, and a roller F with a flat circumferential surface can swing on this support shaft as shown in the second figure. The supporting arm G is rotatably supported at the tip of the supporting arm G, and its circumferential surface is brought into light contact with the lower circumferential surface of the guide support member A due to the rotational behavior of the supporting arm G under the bias of a spring H.

In such a guide support structure for the movable member B, the umbrella-shaped roller D is placed on the guide support member A, so that the weight of the movable member B is supported by the guide support member A, and the roller By lightly abutting the lower peripheral surface of the guide support member A, the movable member B
The movable member B can be moved along the guide support member A through the rolling motion of each roller while preventing the rollers from rising up.

In addition, the umbrella-shaped rollers D and rollers F are provided at a plurality of locations along the moving direction of the movable member B, as shown in the fourth figure.
For example, in the case shown, umbrella-shaped rollers D are provided at two locations and rollers F are provided at one location to prevent floating in the moving direction when the movable member B moves and to share the load applied from the movable member B to the rollers. are doing.

By the way, in such a structure, it is necessary to make the precision of the guide support member A considerably high due to the mission of guiding and supporting the movable member, and the processing precision is also required to be strict.

Therefore, a structure using such a guide support member A has the disadvantages of high processing costs, an increase in weight due to the need for a certain cross-section size, and furthermore, the structure using the guide support member A has the following disadvantages: Since there is no restriction on movement of the guide support member A in the circumferential direction by utilizing the clamping action of the guide support member A by the rollers F having a flat circumferential surface, the movable member B moves against the guide support member A. It is necessary to provide a rotation stopper to prevent rotation in the circumferential direction, and when using a rotation stopper, positioning accuracy, etc. is important, and as a result, processing In addition to cost and assembly cost,
There is a possibility that management costs and the like will be required to maintain the accuracy.

(Purpose) The purpose of this invention is to solve the problems of conventional precision holding devices for movable parts, and to simplify the component parts of the device, reduce processing costs and management costs, including maintaining accuracy, and reduce weight. Moreover, it is an object of the present invention to obtain a precision holding device for a movable member that requires less force for movement and less load fluctuation without requiring an additional structure such as a rotation prevention structure for the movable member.

(Structure) In order to achieve this object, the present invention provides a device equipped with a rail member and a movable member that is required to move accurately along the rail member, which is provided above and below the movable member. , support shafts parallel to each other, and rotatably provided on one of the support shafts, with end surfaces parallel to each other,
A pair of first umbrella-shaped rollers are arranged at intervals in the axial direction of the support shaft, and an arrangement interval between the first umbrella-shaped rollers, which are rotatably provided on the other of the support shafts. a second umbrella-shaped roller that is located within and has a circumferential surface parallel to the circumferential surface of the first umbrella-shaped roller, and a gap that is set between the circumferential surfaces of the first and second umbrella-shaped rollers; a rail member consisting of an angle piece located inside and abutting the circumferential surface of each umbrella-shaped roller, the second umbrella-shaped roller at a central position with respect to the rail member, and the first umbrella at positions on both sides thereof. It is characterized by the arrangement of shaped rollers to sandwich the rail member.

Embodiments of the present invention will now be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view corresponding to FIG. 3 showing a precision holding device according to an embodiment of the present invention.

A feature of the embodiment shown in FIG. 1 is that the guide support member 1A, which is a rail member, is constructed from a bent angle piece.

That is, the guide support member 1A is constructed by bending a sheet metal component configured as a rail member or a part of a structural portion constituting the main body of the device that accommodates the movable member 2B into an angular shape.

On the other hand, a support shaft 3C is attached above and below the end surface _2B1 of the movable member 2B.
C has small diameter end faces facing each other and parallel to each other,
A pair of first umbrella-shaped rollers 4D are rotatably supported and are arranged at intervals in the axial direction of the support shaft 3C, and their peripheral surfaces are placed on the upper surface of the guide support member 1A. ing.

Therefore, the first umbrella-shaped roller 4D is in contact with the inclined surface of the guide support member 1A.

On the other hand, a support shaft 5E parallel to the support shaft 3C is disposed below the support shaft 3C, and in the case of the illustrated embodiment, the small diameter end face of the opposing first umbrella-shaped roller 4D is disposed on the support shaft 5E. In other words, in the embodiment, a second umbrella-shaped roller 6F consisting of a pair having a circumferential surface parallel to the circumferential surface of this umbrella-shaped roller 4D is rotatably located at a position facing the inner side of the top of the guide support member 1A. Supported.

Therefore, the second umbrella-shaped roller 6F is located at the center of the guide support member 1A along the axial direction of the support shaft, and the first umbrella-shaped roller 4D is located at the center of the guide support member 1A along the axial direction of the support shaft.
It will be located on both sides of the In other words,
The position of the center line of the contact surface of the first umbrella-shaped roller 4D and the position of the center line of the contact surface of the second umbrella-shaped roller 6F are not the same in the axial direction of the shaft, but are set at shifted positions. ing.

The second umbrella-shaped roller 6F is supported at the free end of the swingable support arm 7G with its base pivotally connected by a rod R implanted in a support portion (not shown) in FIG. , support arm 7G and support pin P
The movable member 2B is prevented from moving by coming into contact with the lower surface of the guide support member 1A due to the biasing force of the coiled spring 8H applied to the movable member 2B.

Since this embodiment has the above-described structure, the guide support member 1A has the first and second umbrella-shaped rollers 4D, 6F.
It looks like both the front and back sides are sandwiched between the two.

Therefore, when the movable member 2B moves, the first and second umbrella-shaped rollers 4D, 6 move on the surface of the guide support member 1A.
F rolls.

On the other hand, if the accuracy of assembling the first and second umbrella rollers 4D and 6F to the guide support member 1A is incorrect, for example, the spacing between the support shafts is not obtained accurately, and the If the spacing is narrow, the first umbrella-shaped roller 4D is attached to the guide support member 1A from both sides, and the second umbrella-shaped roller 6F is attached to the first umbrella-shaped roller 4D. Since the guide and support members 1A are in contact with the central portions of the guide and support members 1A, the guide and support members 1A are pressed toward the other side, thereby preventing the umbrella-shaped rollers from touching the guide and support members 1A. Abutment will be maintained more accurately.

According to this embodiment, since the guide support member 1A is made of sheet metal, changes in plate thickness, curvature, etc. are extremely small, so when the movable member 2B moves, the load applied to the movable member 2B changes. can be made extremely small.

(Effects) As described above, according to the present invention, since the guide support member, which becomes the rail member, is constructed of angle pieces, it has excellent strength, and also reduces variations in processing accuracy, assembly accuracy, etc. Even when variations occur, the contact between the guide support member and the umbrella roller can be maintained accurately, so processing costs and management costs can be reduced.

In addition, by using an angle piece as the guide support member, the umbrella-shaped rollers that come into contact with it will hold the angle piece, making it possible to eliminate the need for a circumferential rotation prevention structure like in conventional devices. Therefore, it is possible to obtain a cheap and lightweight device structure, and it is also possible to reduce load fluctuations during movement of the movable member, so that the force required for movement can be reduced.

Furthermore, it is also possible to facilitate assembly, maintenance, etc. by taking advantage of the light weight.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a precision holding device according to an embodiment of the present invention, Fig. 2 is a view taken along the - line in Fig. 1, Fig. 3 is a sectional view of a conventional precision holding device, and Fig. 4 is a view taken along the - line in FIG. 3; 1A... Guide support member serving as a rail member, 2B...
Movable members, 4D...first umbrella-shaped roller, 6F...second umbrella-shaped roller.

Claims (1)

[Claims for Utility Model Registration] In a device equipped with a rail member and a movable member that is required to move accurately along the rail member, support shafts provided above and below the movable member and parallel to each other; and a first umbrella-shaped roller which is rotatably provided on one of the spindles, has end surfaces parallel to each other, and is arranged in a pair at intervals in the axial direction of the spindle. , rotatably provided on the other side of the spindle,
a second umbrella-shaped roller located within the arrangement interval of the first umbrella-shaped roller and having a circumferential surface parallel to the circumferential surface of the first umbrella-shaped roller; and the first and second umbrella-shaped rollers. a rail member consisting of an angle piece that is set between the circumferential surfaces of the rollers and contacts the circumferential surface of each umbrella-shaped roller; A precision holding device for a movable member, characterized in that a roller and the first umbrella-shaped roller are arranged on both sides of the roller to sandwich a rail member.