JPS62125774A - Linear motion guiding device - Google Patents

Abstract

PURPOSE:To realize a guiding device with a low cost and the high shifting accuracy by forming a guiding part at a fixing stand side and the guided part at a shifting stand side at the slanting surface of a pair of the same angles and shifting the shifting stand in the non-contacting condition through a floating means to the fixing stand. CONSTITUTION:The shifting stand 17 floats a little from the surface of guide members 13 and 14 by floating members 15 and 16, is kept to the condition of the non-contact and shifts the surface of the guide members 13 and 14 by a driving source 21. Since the guide members 13 and 14 and the floating members 15 and 16 are both formed to the reverse truncated chevron shape, both members are always satisfactorily fitted by the gravity of the shifting stand 17. Since the shifting stand 17 shifts in the condition of the non-contacting to guide members 15 and 16, without needing the high surface accuracy, most of the shifting accuracy of the shifting stand 17 is determined by the fitting accuracy of the guide member 13 and 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a linear motion guide device suitable for application to a document table drive system of a large facsimile machine.

BACKGROUND OF THE INVENTION Conventional optical devices such as facsimile machines require the movement of a machine stand or an optical system in order to read a document, and are equipped with a linear motion guide device for driving the movement.

A conventional linear motion guide device generally has a structure in which a movable table 4 is slidably attached to a pair of rods 2.3 provided on a fixed table 1, as shown in FIG. In addition, in machine tools, etc., as shown in FIG. A combined structure is used.

Problems to be Solved by the Invention However, since such a conventional linear motion guide device uses contact guidance, it is directly affected by component accuracy and assembly accuracy, and the movement accuracy of the moving table 4 is affected. The cost would have been higher to improve it. In addition, since it is a contact guide, accuracy decreases due to wear caused by sliding.
In some cases, the desired movement accuracy cannot be obtained. If a graining process is applied to prevent wear, the cost will increase accordingly.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved linear motion guide device that provides high accuracy at low cost.

Means for Solving the Problems The linear motion guide device according to the present invention is characterized in that a movable table is guided with respect to a fixed table in a non-contact manner by magnetic levitation means. The fixed base has a guide portion whose end face is oblique, and the movable base has a guided portion whose end face opposite to the end face of the guide portion is sloped at the same angle.

Operation: Since the guide part on the fixed base side and the guided part on the movable base side are both formed on slopes of the same angle, they fit well together, and the movable base is guided in a non-contact state by the levitation means. Ru.

Embodiment FIG. 1 shows an embodiment of the present invention, and FIG. 2 is a side view of the apparatus shown in FIG. A pair of guide members 13.14 are fixed to both sides along the longitudinal direction of the upper surface of the fixed base 11 via a servant-shaped pillow member 12, and the guide members 13.1
The four pieces are diagonally facing each other. The upper surfaces of the guide members 13 and 14 are magnetized with N poles, and the floating members 15 and 16, whose end faces facing the surfaces are formed at the same angle and each magnetized with S poles, are magnetized on the surface of the moving table 170F. Fixed and placed. The movable table 17 is connected to a connecting rod 19 via a universal joint 18 at one end thereof, and the other end of the connecting rod 19 is connected to a drive source 21 attached to the fixed table 11 via a bracket 20 for reciprocating movement. Connected to the drive shaft.

The movable table 17 is slightly floated above the surface of the guide member 13.14 by the floating member 15.16 and kept in a non-contact state, and is moved on the surface of the guide member 13.14 by the drive source 21. Guide member 13.14 and floating member 15.16
Since both are formed in an inverted U-shape, the gravity of the movable table 17 always ensures a good fit between the two, but by appropriately setting the gravity balance of the movable table 17,
It can be moved with just a small amount of driving force. Mobile platform 1
7 moves in a non-contact state with respect to the guide members 15 and 16, so a high level of surface accuracy is not required compared to when moving in a close contact manner, and the movement accuracy of the moving table 17 is A large part is determined by the installation accuracy of 13.14. Also,
Vibrations caused by the drive source 21 are removed by the universal joint 18 of the connection part.
absorbed by.

For simplification, the guide members 13, 14 may be attached to the fixing base 11.
The floating members 15 and 16 may be formed directly on the moving table 1.
7 may be formed directly. Furthermore, instead of the magnetic levitation means, means for levitating by jetting air may be used.

Furthermore, various means such as wires, belts, chains, links, etc. can be used to drive the moving table 17.

Effects of the Invention As described above, in the linear motion guide device according to the present invention, the guide portion on the fixed base side and the guided portion on the movable base side are formed into a pair of slopes having the same angle, and the movable base is formed with respect to the fixed base. Since the surface is moved without contact via a flotation means, there is no need for a high level of surface accuracy as in conventional methods.
A guide device with high movement accuracy can be realized at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a linear motion guide device showing an embodiment of the present invention, and FIG.
The J-plane view and FIG. 3 are schematic perspective views showing an example of a conventional linear motion guide device, and FIG. 4 is a schematic 11t31+ perspective view showing an example of a conventional linear motion guide device. 11... Fixed stand, 12... Pillow member, 13.14
...Guide member, 15.16...Floating member, 17...Moving table, 18...Universal joint, 1
9...4.・Connecting rod, 2o...Bracket, 21
...Drive #. Name of agent: Patent attorney Ken Nakao and 1 other person]6
61 Diagram l Identification stand/Z Cane push rod 73.14 Power F' Furnace ls, IG Tamejo Tsugi 1 17 Transference/3.14 Kite Ariake mo-cho Figure 2 /S, IG private money pg figure 3

Claims (1)

[Claims] a fixing base; a guide part provided along the longitudinal direction of the fixing base and having an oblique end face facing the fixing base; and a guide part disposed above the fixing base and facing the end face of the guide part. A linear motion guide device comprising: a movable table having a guided portion whose end faces are sloped at the same angle; and means for floating the guided portion with respect to the guide portion.