JPS599352A - Nut supporting mechanism for sliding body drive unit - Google Patents

Abstract

PURPOSE:To accurately feed a sliding body along a guide surface by constructing that a nut has high rigidity in the axial direction and turning direction of a screw, may freely move in parallel in a section perpendicular to the axial direction of the screw to be freely turnable around the crossing point of the section with the axial center of the screw as a center. CONSTITUTION:When a feed screw 3 fluctuates in rotation or is displaced from the set position (a) to the position (a') due to the mounting error to a guide surface 1, a nut (5) with a shaft associated with it moves from a position (b) to the position (b'), an inside nut supporting box 7 moves from a position (c) to the position (c'), an outside nut supporting box 9 does not vary, and the influence of the error of the screw 3 is not transmitted to a sliding body 2. Accordingly, the fluctuation of the screw or the sliding error of the sliding body due to the error in the parallelism of the screw to the guide surface is removed, and the slide is accurately slid along the guide surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for attaching a nut to a sliding body when the sliding body is driven by a lead screw k, which slides the sliding body along a guide surface by a combination of a feed screw and a nut. relates to mechanisms.

FIG. 1 shows a conventional sliding device, in which a nut 4 that engages with a feed screw 3 is fixed to a sliding body 2 that slides along a guide surface 1. Therefore, as shown in FIG. 2, the feed screw 3 may not be installed parallel to the guide surface 1, or the feed screw 5
If it swings around, the sliding body 2 will not slide accurately along the guide surface 1.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to eliminate sliding errors caused by the flexure of the feed screw or the setting error of the parallelism of the feed screw to the guide surface, and to improve accuracy by eliminating sliding errors caused by setting errors in parallelism of the feed screw to the guide surface. An object of the present invention is to provide a nut support mechanism for sliding a sliding body.

In order to achieve the above purpose, the nut that engages with the feed screw has high rigidity in the axial direction and rotational direction of the feed screw, but can move freely in parallel and in the cross section perpendicular to the axial direction of the feed screw. Moreover, the support structure is such that it can freely rotate around the point where the cross section intersects with the axis of the feed screw.

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. The feed screw 3 is engaged with a cut 5 with a shaft, and a first shaft 6 is fixed to the nut 5 with a shaft in a direction perpendicular to the axis of the feed screw 3. It is held in the inner nut support box 7 by a bearing 10 which allows the rotation of the nut.

The inner nut support box 7 has an axial direction of the feed screw 3 and
A second shaft 8 is fixed in a direction perpendicular to the direction of the axis of the first shaft 6, and the second shaft 8 is supported by a bearing UK that can move in the axial direction and rotate around the axis, An inner nut support box 7 is held within an outer nut support box 9. The outer cut support box 9 is fixed to the sliding body 2.

If the feed screw 3 deviates from the setting position a to α due to an error in its rotation or installation on the guide surface 1, the shafted nut 5tdh that engages with it moves from tdh to b', and the inner nut support box 7 moves to C. Move from to C' and remove the outer nut support box 9.
does not change, and the influence of the error in the feed screw 5 is not transmitted to the sliding body 2.

According to the present invention, it is possible to eliminate the sliding error of the sliding body due to the swing of the feed screw and the error in the parallelism of the feed screw to the guide surface, and to precisely slide the sliding body along the guide surface. can.

As mentioned above, even if only the configuration of either the first shaft or the second shaft is used, the lead screw (and the sliding body 2) Alignment errors in a certain direction can be absorbed.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional sliding device using a feed screw and nut, Figure 2 is an explanatory diagram showing the sliding error of the slide body due to errors in the installation of the feed screw, and Figure 5 is an illustration of the actual sliding device. FIG. 4, which is a cut sectional view of an embodiment of the invention, is also an explanatory diagram of the operation. 1... Guide surface, 2... Sliding body. 5... Force feeding screw, 5... Nut with shaft 7.
...Inner nut support box. 9...Outer nut support box. ／″´U〉 Agent Patent Attorney Usui 1) Enoki Iyuki 1st layer O? Closed'1

Claims (1)

[Claims] 1. A feed screw is attached to a base having a guide surface. In a sliding device in which a nut that engages with the feed screw is attached to a sliding body, and the slide body is slid along the guide surface by rotation of the feed screw, the axis is in a direction perpendicular to the axis of the feed screw. A nut with a shaft that has a corresponding second shaft and is fitted with a feed thread, and a bearing that allows the nut with a shaft to move in the axial direction and rotate around the axis, and the nut with a shaft an inner nut holding box that rotatably and reciprocally holds the inner nut 1; A second shaft whose centers coincide with each other is installed, and the second shaft is moved in the direction of the axial center and rotated around the axial center h! - A nut support mechanism for a sliding member drive unit, characterized in that an outer nut holding box has a possible second rotatable and reciprocating bearing, and the outer nut holding box is fixed to a sliding member.