JPH05149333A - Slide rail unit - Google Patents

Abstract

PURPOSE:To provide a slide rail unit which can prevent the vertical backlash at both ends in the shifting direction of a shifting table. CONSTITUTION:This slide unit has a slide shaft 2, which extends in the shape of a straight line, a shifting table r4, which is provided freely of shifting axially on the slide shaft 2, and a supporting base 1, which extends in the axial direction of the slide shaft 2 and supports this slide shaft 2. The supporting base 1 has rail faces 1b parallel with this slide shaft 2 on both sides of the slide shaft 1, and the shifting table 4 is equipped with at least two wheels 8 rotating and moving on each rail face 1b, and at least one wheel 8 between these two wheels 8 is provided with a specified interval in the axial direction of the slide shaft 2 to the other wheel 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide rail unit for guiding and holding, for example, a printer head or the like which requires a high degree of linear movement.

[0002]

2. Description of the Related Art Conventionally, as a slide rail unit of this type, there is known a slide rail unit provided with a linearly formed slide shaft and a movable base fitted to the slide shaft so as to be axially movable. ing.

[0003]

However, in the above-mentioned conventional slide rail unit, since there is a slight gap in the fitting portion between the slide shaft and the moving base, the vertical movement is made at both ends in the moving direction of the moving base. There was rattling, which was one of the problems in improving the straightness of the moving base.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a slide rail unit capable of preventing vertical rattling at both ends in the moving direction of a moving table.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 has a slide shaft extending linearly, a movable base axially movable on the slide shaft, and A slide rail unit comprising a support base extending in the axial direction of the slide shaft and supporting the slide shaft, wherein the support base has rail surfaces parallel to the slide shaft on both sides of the slide shaft. However, at least two wheels that rotate and move on the rail surfaces are provided on the moving table, and at least one of these wheels is provided with a predetermined distance in the axial direction of the slide shaft with respect to the other wheels. The feature is that it is provided at intervals.

According to a second aspect of the present invention, in the slide rail unit according to the first aspect, the movable table is fixed to a slide bearing fitted to the slide shaft so as to be axially movable. There is.

According to a third aspect of the present invention, in the slide rail unit according to the second aspect, the movable table has a recess fitted to the outer peripheral surface of the slide bearing, and the recess side is provided along the recess. Of the inner piece and an outer piece on the outer surface side have a slit, the outer piece has a screw hole penetrating from the outer surface to the slit, and in the screw hole, the inner piece from the slit. It is characterized by a bolt that pushes against the slide bearing side.

According to a fourth aspect of the present invention, in the slide rail unit according to any one of the first to third aspects, the vehicle has an inner ring fitted on an axle held by a moving table and a rail surface. It is characterized in that it is a rolling bearing having an outer ring that rotates.

According to a fifth aspect of the present invention, in the slide rail unit according to any one of the first to third aspects, the vehicle is mounted on an axle held by a moving base via an eccentric collar. The eccentric collar is characterized in that the axial center of the inner peripheral surface fitted to the axle is deviated from the axial center of the outer peripheral surface rotatably fitted to the vehicle.

According to a sixth aspect of the invention, in the slide rail unit according to the fourth aspect, the inner ring of the axle shaft bearing is coupled via an eccentric collar, and the eccentric collar is fitted to the axle. The axial center of the inner peripheral surface and the axial center of the outer peripheral surface fitted to the inner ring are misaligned.

[0011]

In the invention according to claim 1 configured as described above, at least one vehicle is provided at a predetermined interval in the axial direction of the slide shaft with respect to the other vehicles. Both ends in the moving direction of are supported by cars. Therefore, rattling in the vertical direction at both ends of the moving table in the moving direction is eliminated, and the straightness of the moving table is improved.

Further, in the invention described in claim 2,
Since the slide bearing is movably fitted to the slide shaft, the movement resistance of the moving table is reduced.

Further, in the invention according to claim 3,
When the bolt is screwed into the screw hole and the inner piece is pushed from the slit portion, the inner piece bends toward the concave portion, and the concave portion adheres to the outer periphery of the slide bearing. Therefore, the connecting portion between the slide bearing and the moving base can be accurately and firmly formed.

In the invention described in claim 4,
Since the car is made up of rolling bearings, the rolling resistance of the car is extremely small, and the rolling bearing has a very high degree of concentricity between the outer and inner peripheral surfaces and a high degree of roundness on the outer surface. Straightness is improved.

Further, in the inventions according to claims 5 and 6, the force with which the outer peripheral surface of the vehicle abuts on the rail surface can be adjusted by the eccentric collar, so that at both ends in the moving direction of the moving table. The rattling in the vertical direction is completely eliminated, and the straightness of the moving base is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 is a support base, which is formed in the shape of a flat plate extending linearly, and holds a slide shaft 2 on the center line in the longitudinal direction thereof. The holding portion 1a is formed. Further, rail surfaces 1b are formed in parallel to the slide shaft 2 at symmetrical positions on both sides of the holding portion 1a. Slide shaft 2
Is formed in the shape of a straight rod having a circular cross section, and has a high degree of cylindricity and straightness. The slide shaft 2 is fixed to the support portion 1a of the support base 1 and is parallel to each rail surface 1b. Further, as shown in FIGS. 2 to 4, the slide shaft 2 is provided with a moving table 4 via a slide ball bearing (slide bearing) 3.
Is provided.

The slide ball bearing 3 is a support base 1.
It is formed into a cylindrical shape with a C-shaped cross section so as to fit on the outer peripheral surface of the slide shaft 2 so as to sandwich the supporting portion 1a of the above. A plurality of balls (not shown) are provided. The moving table 4 has a rectangular box-like appearance, and a recess 4b that fits into the outer peripheral surface of the slide ball bearing 3 is formed on the center line of the bottom surface 4a thereof. The recess 4b is formed in a cylindrical shape having a C-shaped cross section so as to cover the outer peripheral surface of the slide ball bearing 3, and the diameter thereof is slightly larger than the outer diameter of the slide ball bearing 3. (See Figure 3).

Further, one slit 4c is formed on the movable table 4 vertically from the bottom surface 4a and parallel to the axis of the concave portion 4b. This slit 4c forms the concave portion 4b on the movable table 4.
It is divided into an inner piece 4d on the side and an outer piece 4f on the side of the outer surface 4e. The outer piece 4f is formed with screw holes 4g penetrating from the outer side surface 4e to the slit 4c at both axial ends of the recess 4b, and the tip of the screw hole 4g has a slit 4c.
A bolt 5 is provided to reach the inner piece 4d from the inside and bend the inner piece 4d toward the recess 4b.

Further, the movable table 4 has outer surfaces 4e on both sides.
A storage space 4h for the ball bearing 8 described later is formed at a predetermined depth from. The storage space 4h is formed in the shape of a hole having a circular cross section with an opening along the bottom surface 4a, and its axis is located at the center of each outer surface 4e in the width direction (the center of the recess 4b in the axial direction). is doing. A screw hole 4i is formed in the side wall of the storage space 4h at the axial center position, and a circular seat surface 4j is formed coaxially with the screw hole 4i. The axle 6 is attached through the screw holes 4i and the seat surface 4j.

The axle 6 has a disc-shaped flange 6a which fits precisely on the circular seat surface 4i.
The male screw 6b screwed into the screw hole 4i is provided at one end of a, and the bearing portion 6c and the male screw 6d are provided at the other end. The axle 6 has a male screw 6b at one end screwed into the screw hole 4i, and the flange 6a is fitted to the seat surface 4j so as to be fixed to the moving base 4, and the bearing portion 6c is provided with the eccentric collar 7. Rolling bearings (cars) 8 are provided therethrough.

The eccentric collar 7 is formed by displacing the axis of the inner peripheral surface 7a and the axis of the outer peripheral surface 7b, which are fitted to the bearing portion 6c of the bearing 6, in parallel with each other, and one end of the outer peripheral surface 7b. A collar 7c having knurls is formed on the outer peripheral surface of the collar. The rolling bearing 8 is provided with an inner ring 8a fitted to the outer peripheral surface 7b of the eccentric collar 7, an outer ring 8b constituting the outer peripheral surface of the vehicle, and a ball (not shown) sandwiched therebetween. is there. The rolling bearing 8 is fixed to the axle 6 with both ends of the inner ring 8a being sandwiched by the flange 6a and the flange 7c by a nut 9 screwed onto a male screw 6d.

A dustproof member (dustproof means) 10 is provided on both end faces of the moving table 4 in the moving direction. The dustproof member 10 is formed of a flexible plate-shaped member such as rubber, and its seal portion 10a is formed in a shape that matches the outer peripheral surface of the slide shaft 2 and the rail surfaces 1b on both sides. ing. Furthermore, this seal portion 10a is
A portion contacting the outer peripheral surface of the slide shaft 2 and the rail surface 1b is formed in a linear shape, and is obliquely cut away in a direction away from the slide shaft 2 or the rail surface 1b as the linear portion approaches the moving base. The dustproof member 10 is fixed to the moving table with screws 11.

Further, as shown in FIG. 4, dust seals 12 are provided at both ends of the slide ball bearing 3 in the concave portion 4b of the movable table 4. The dust seal 12 is
Similar to the dustproof member 10, it prevents dust and the like from entering between the slide shaft 2 and the slide ball bearing 3. The dust seal 12 is a retainer 13
Is fixed in the recess 4b.

In the slide rail unit configured as described above, each bolt 5 is tightened while the recess 4b of the moving base 4 is fitted in the slide ball bearing 3, and the recess 4b is attached to the outer periphery of the slide ball bearing 3. Stick it to the surface. As a result, the slide ball bearing 3 and the movable table 4 are connected to each other in a state where there is no rattling. Further, the eccentric collar 7 is rotated to move the rolling bearing 8 up and down, and the rolling bearings 8 on both the left and right sides are adjusted so as to come into contact with the rail surfaces 1b with an appropriate force. As a result, the moving table 4
The rattling around the axis of the slide shaft 2 at is completely eliminated.

Further, as the movable table 4 moves, the dustproof member 1
0 always removes dust and the like on the slide shaft 2 and the rail surface 1b. In particular, the sealing portion 10a of the dustproof member 10
Is in contact with the slide shaft 2 and the rail surface 1b at a linear portion, and is inclined in a direction away from the slide shaft 2 and the rail surface 1b as the linear portion approaches the moving table 4, so that the seal portion There is almost no dust or the like that enters the moving table 4 through the 10a.

Further, since the dust seal 13 is provided, the amount of dust and the like entering the slide ball bearing 3 is reduced. Further, since the outer circumference of the rolling bearing 8 provided as a car is surrounded by the storage space 4h, dust and the like will not be accumulated on the outer circumference of the rolling bearing 8.

According to the slide rail unit constructed as described above, the rolling bearing 8 can completely prevent the rotation of the slide shaft 2 of the movable table 4 about the axis thereof, and therefore the rotation of the movable table 4 is prevented. To prevent this, it is not necessary to provide two slide rail units in parallel, or to additionally provide a rotation preventing rail. Therefore, the cost of the product in which the slide rail unit is incorporated can be reduced, and the space of the incorporated portion can be narrowed. Further, since the rolling bearing 8 is used as the vehicle, the resistance of rolling on the rail surface 1b can be made extremely small.

In addition, since the rolling bearing generally has extremely high accuracy such as the roundness of the outer peripheral surface and the coaxiality between the inner peripheral surface and the outer peripheral surface, the movable table 4 is fitted in parallel with the rail surface 1b. Therefore, the straightness of the moving table 4 can be improved. Furthermore, since the outer peripheral surface of the rolling bearing 8 can be adjusted by the eccentric collar 7 so as to contact the rail surface 1b with a predetermined force, the straightness of the moving table 4 can be improved also from this point.

Further, by tightening the bolt 5,
Since the slide ball bearing 3 and the recess 4b of the moving table 4 can be completely brought into close contact with each other, the rattling of the connecting portion between the slide ball bearing 3 and the moving table 4 can be completely eliminated, and the moving table 4 The straightness of the vehicle can be further improved. In addition, the dustproof member 10 and the dust seal 12
Since dust on the slide shaft 2 and the rail surface 1b can be removed by the above, the ball in the slide ball bearing 3 and the outer peripheral surface of the rolling bearing 8 ride on the dust and the like, so that the moving base 4 moves straight. It is possible to prevent problems such as deterioration of the properties, and it is possible to improve the life of the slide ball bearing 3 and the rolling bearing 8.

Furthermore, since the storage space 4h can prevent dust and the like from accumulating on the outer peripheral surface of the rolling bearing 8, for example, dust and the like accumulated on the outer peripheral surface of the rolling bearing 8 can be deposited on the rail surface 1b. It is possible to prevent a problem such that stepping on the moving base 4 impairs the straightness of the moving base 4. Further, since the dustproof member 10 is attached to the end surface of the moving table 4, it is possible to easily visually detect deterioration or damage of the seal portion 10a, and deterioration of the straightness of the moving table 4 due to dust or the like. Before the occurrence of wear, etc., the dustproof member 1
You can take actions such as replacing 0.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. However, the same components as those of the first embodiment shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted.

The slide rail unit of the second embodiment differs from the slide rail unit of the first embodiment in that FIG.
As shown in FIG. 5, the movable table 20 has a different shape and a cover 21 is provided. That is, the movable table 20 has the same bottom surface 4a, recess 4b, slit 4c and inner piece 4d as the first embodiment, but the shapes of the left and right outer surfaces 20a and outer piece 20b are different. Outer surface 20a
Has a notched shape with an L-shaped cross section except for the upper end 20c of the movable table 20. The outer piece 20b is divided into the outer surface 20a side by the slit 4c.

On each of the outer side surfaces 20a on both sides, a screw hole 4i and a seat surface 4j are formed at the forward end and the backward end in the moving direction of the movable table 20 (the direction of the axis of the recess 4b).
Are formed. That is, the screw hole 4i and the seat surface 4
As shown in FIG. 6, j is staggeredly arranged at the farthest positions in the moving direction between the forward end and the backward end of each outer surface 20a. Also, the outer piece 20b
At the center position of the moving table 20 in the moving direction,
A screw hole 20d penetrating from a to the slit 4c is formed, and a screw (bolt) 22 having a hexagonal hole in the head which is recessed in the screw hole 20d is screwed into the screw hole 20d. Has been done.

At the tip of the screw 22, the inner piece 4d is bent toward the recess 4b so that the recess 4b slides into the slide ball bearing 3.
It is designed to be in close contact with the outer circumference of. Also, cover 2
1 is a rolling bearing 8 provided on the left and right sides of the outer surface 20a
It is formed so as to surround in cooperation with, and at the bottom,
An opening 21a is formed so that the outer peripheral surface of the rolling bearing 8 contacts the rail surface 1b (see FIG. 6). The cover 2 is fixed to the upper end portion 20c of the movable table 20 with bolts 23.

In the slide rail unit constructed as described above, the same action as in the first embodiment is produced, but since the left and right rolling bearings 8 are further provided at positions distant from each other in the moving direction, It is possible to eliminate vertical rattling at both ends in the moving direction of the moving table 20, which cannot be eliminated only by the ball bearings 3. Moreover, since the eccentric collar 7 can adjust the outer peripheral surface of each rolling bearing 8 so as to contact the rail surface with a predetermined force, the above-mentioned rattling in the vertical direction can be completely eliminated.

According to the slide rail unit constructed as described above, it is possible to completely eliminate vertical rattling at both ends in the moving direction of the moving table 20 which could not be eliminated by the slide ball bearing 3 alone. Therefore, the straightness of the movable table 20 can be further improved. Other than that, the same effect as the first embodiment is obtained.

In the second embodiment, the rolling bearings 8 of the moving table 20 are provided alternately at the positions displaced in the moving direction. However, the rolling bearings 8 or the wheels are arranged as shown in FIG. Needless to say, it may be configured to be provided at the four corners of the moving table 30 formed in a rectangular shape in bottom view. In this case, since the moving base 30 is supported by the four rolling bearings 8, the moving base 30 can be supported in an extremely balanced manner, and the straightness of the moving base 30 can be further improved. Further, by arranging the movable bases 4 shown in the first embodiment in series on the same slide shaft 2 and providing a member for connecting these movable bases 4, the same operation as the slide rail unit shown in FIG. 7 is achieved. Produce an effect.

Further, in each of the above embodiments and the example of FIG. 7, the moving table 4,
Although 20 and 30 are provided, it goes without saying that the movable table 4 or the movable table 20 may be directly provided on the slide shaft 2 so as to be movable in the axial direction. Further, it goes without saying that a slide bearing may be used instead of the slide ball bearing 3. Furthermore, in each of the above-described embodiments and the example of FIG. 7, the rolling bearing 8 is used as the vehicle, but this vehicle is simply provided on the outer peripheral surface 7b of the eccentric collar 7 or the bearing portion 6c of the axle 6 so as to be rotatable. It goes without saying that it may be annular.

Further, although the rail surface 1b is formed on the support base 1 in each of the above-mentioned embodiments, the rail surface 1b is formed.
Needless to say, the support base 1 may be formed on the support base 1 by coating or plating the support base 1 in layers. In this case, since only the rail surface 1b can be formed of a material having high lubricity such as a material having a high hardness or an oil-containing material, the durability of the rail surface 1b is improved and the rolling resistance of the vehicle (rolling bearing) is increased. Can be reduced. Moreover, since only a special material such as a material having high hardness is used only for the rail surface 1b, it is possible to minimize the cost increase due to the improvement of durability and the like.

Furthermore, the rail surface 1b may be formed on the upper surface of a rail member 40 which is separate from the support base 1, as shown in FIG. This rail member 40
Is detachably attached to the support base 1 by fitting a T-shaped convex portion 40 a provided on the lower surface of the rail member 40 and a T-shaped recess portion 1 c provided on the support base 1. In this case, by using a material having a high hardness or a material having excellent lubricity for the rail member 40, it is possible to improve the durability, and by replacing the rail member 40,
There is an advantage that high performance can be maintained continuously for a long period of time.

In each of the above embodiments, the dustproof member 1
Although 0 is provided on both end faces of the moving bases 4 and 20 in the moving direction, it goes without saying that it may be provided on only one end face. Further, although the seal portion 10a of the dustproof member 10 is formed by one slope, like the dustproof member 50 shown in FIG.
For example, it may have two ridges 51. Each of these ridges 51 is formed in a saw-tooth shape, and one surface thereof is orthogonal to the rail surface 1b or the outer peripheral surface of the slide shaft 2 and the other surface is closer to the moving bases 4 and 20. It is inclined in a direction away from 1b and the like.

According to this dustproof member 50, one ridge 5
Even if dust or the like passes through 1, the dust or the like can be caught by the other protrusion 51. In addition, since the lubricating oil is retained in the groove between the ridges 51, the lubricity of the seal portion can be improved, and this lubricating oil holds dust and the like in the groove so that the dust and the like can move from the groove to the moving table. It is possible to prevent escape to the 4 and 20 sides.

[0045]

According to the invention described in claim 1, at least one vehicle is provided at a predetermined interval in the axial direction of the slide shaft with respect to the other vehicles. Both ends can be supported by the vehicle, and vertical rattling at both ends in the moving direction of the movable table can be eliminated. Therefore, the straightness of the moving base can be extremely improved.

Further, in the invention described in claim 2,
Since the slide bearing is movably fitted to the slide shaft, the movement resistance of the moving base can be made extremely small.

Further, in the invention described in claim 3,
By screwing the bolt into the screw hole, the recess can be brought into close contact with the outer periphery of the slide bearing, so rattling of the connecting part between the slide bearing and the moving base can be completely eliminated, and the straightness of the moving base can be improved. Can be improved.

Further, in the invention described in claim 4,
Since the vehicle is composed of rolling bearings, the movement resistance of the moving base can be made extremely small. Moreover, since the rolling bearing has an extremely high degree of concentricity between the outer peripheral surface and the inner peripheral surface and a high circularity of the outer peripheral surface, the straightness of the moving base can be improved.

According to the fifth and sixth aspects of the present invention, the force with which the outer peripheral surface of the vehicle abuts on the rail surface can be adjusted by the eccentric collar, so that both ends of the moving base in the moving direction are adjusted. The rattling in the vertical direction can be completely eliminated. Therefore, the straightness of the moving base can be extremely improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of a slide rail unit shown as a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a moving base of the slide rail unit.

FIG. 3 is an end view of the slide rail unit in the moving direction.

FIG. 4 is a bottom view of a moving table of the slide rail unit.

FIG. 5 is an exploded perspective view of a moving base of a slide rail unit shown as a second embodiment of the present invention.

FIG. 6 is a bottom view of a moving table of the slide rail unit.

FIG. 7 is a bottom view of a movable table shown as another example of the first and second embodiments of the present invention.

FIG. 8 is an external perspective view of a support base shown as another example of the first and second embodiments of the present invention.

FIG. 9 is a sectional view of a dustproof member shown as another example of the first and second embodiments of the present invention.

[Explanation of symbols]

 1 support base 1b rail surface 2 slide shaft 3 slide bearing (slide ball bearing) 4, 20, 30 moving base 4b recess 4c slit 4d inner piece 4e, 20a outer side surface 4f, 20b outer piece 4g, 20d screw hole 5 bolt 6 axle 7 Eccentric collar 7a Inner peripheral surface 7b Outer peripheral surface 8 Car (rolling bearing) 8a Inner ring 8b Outer ring 22 Screw (bolt)

Claims (6)

[Claims] 1. A linearly extending slide shaft, a moving base axially movable on the slide shaft, and a support base extending in the axial direction of the slide shaft and supporting the slide shaft. A slide rail unit provided with, wherein the support base has rail surfaces parallel to the slide shaft on both sides of the slide shaft, and the moving base has at least a rotary surface on which the rail surface is moved. The slide rail unit is characterized in that at least one of these cars is provided at a predetermined distance from the other cars in the axial direction of the slide shaft. 2. The slide rail unit according to claim 1, wherein the movable table is fixed to a slide bearing that is fitted to the slide shaft so as to be movable in the axial direction. 3. The movable table has a recess fitted to the outer peripheral surface of the slide bearing, and has a slit along the recess for partitioning the inner piece on the concave side and the outer piece on the outer side. The outer piece has a screw hole penetrating from the outer surface to the slit, and the screw hole is provided with a bolt for pushing the inner piece from the slit to the slide bearing side. The slide rail unit according to claim 2. 4. The rolling bearing according to claim 1, wherein the vehicle is a rolling bearing having an inner ring fitted to an axle held by a moving table and an outer ring rotatably moving on a rail surface. The slide rail unit according to any one of 1. 5. The vehicle is attached to an axle held by a moving base via an eccentric collar, and the eccentric collar is
4. The shaft center of the inner peripheral surface fitted to the axle and the shaft center of the outer peripheral surface rotatably fitted to the vehicle are deviated from each other. Slide rail unit. 6. The axle and the inner ring of the rolling bearing are coupled to each other via an eccentric collar, and the eccentric collar has an axial center of an inner peripheral surface fitted to the axle and an axial center of an outer peripheral surface fitted to the inner ring. The slide rail unit according to claim 4, wherein the slide rail units are offset from each other.