JPS63167170A - Movable table - Google Patents

Abstract

PURPOSE:To prevent to give an influence to a sliding movement even though the accuracy of assembly is low, by installing a ball nut and a ball screw movable, and making to give no restriction to the ball screw and a guide rail to move in the direction square to the axis. CONSTITUTION:The movable table is fastened by a bolt 10 with steps which has a length-regulating part of the length a, placing a minute gap alpha to the flange 7 of a housing 9. As a result, a ball nut 1 and a ball screw 2 can move in the radial direction as long as the space beta without restriction by a guide rail 3. Therefore, the rotation movement generated by a motor is converted to a straight movement by the ball nut 1 and the ball screw 2, the ball nut 1 and the ball screw 2 move in the radial direction even though the out-of- roundness of the ball screw 2 is not good, or the assembling accuracy is not good, and no influence is given to the rotation torque.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving table for general industrial machinery.

Conventional technology An example of a conventional moving table will be described.

4 is a side view of a conventional moving table, FIG. 6 is a sectional view of the same, and FIG. 6 is a sectional view taken along the cutting line BB' in FIG. 5. In Figures 4, 5, and 6, 2
1 is a ball nut that converts the rotational motion of the ball screw 22 into linear motion; 23 is a ball 24 that is parallel to the ball screw 22;
A guide rail having a pair of transfer grooves 26 for holding the 2
6 is a moving block that slides relative to the guide rail 23 in the same direction as the transfer groove 26; the guide rail 23, the balls 24, and the moving block 26 constitute a linear sliding bearing. 27 is a flange fixed to the ball nut 21 for transmitting the linear motion obtained by the ball nut 21, the ball screw 22, and the motor 28 to the housing 29 fixed on the moving block 26; 3o is the flange 27
This is a bolt for fixing the housing 29.

The moving table configured in the above part is the ball nut 2
1 is fixed to a housing 29 by a flange 27.

Problems to be Solved by the Invention However, in the movable table configured as described above, the ball screw 22 and the guide rail 23 are constrained in the direction perpendicular to the axis. The parallelism of the ball screw and the straightness of the ball screw are required to be very high, which increases the cost of parts and is disadvantageous in terms of assembly.

In view of the above problems, it is an object of the present invention to provide a moving table in which the ball screw 22 and the guide rail 23 are not restrained from each other in a direction perpendicular to the axis.

Means for Solving the Problems In order to solve the above problems, the present invention provides a ball screw that extends in one direction, a ball nut that converts rotational motion of the ball screw into linear motion, and a ball screw that is attached to the ball screw. It consists of a guide rail provided in parallel, a moving block that is slidable along the guide rail, a housing mounted on the moving block, and a flange that fixes the ball nut and the housing.
The housing is configured to have a small gap between the housing and the ball nut, and between the housing and the flange so that they can move in a direction perpendicular to the axis.

Effect: Due to the above configuration, the ball screw and guide rail of the present invention are not restricted in the direction perpendicular to the axis, and even if the ball screw has low straightness and assembly accuracy, it does not affect sliding, and costs are reduced. It is also advantageous.

EXAMPLE Hereinafter, a moving table according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view taken along cutting line AA' in FIG. 2. Figures 1 and 2.

In FIG. 3, 1 is a ball nut that converts the rotational motion of the ball screw 20 into linear motion, 3 is a guide rail that is parallel to the ball screw 2 and has a pair of transfer grooves 5 that hold the balls 4, and 6 is relative to the guide rail 3. , a moving block that relatively slides in the same direction as the transfer groove 6. The guide rail 3, balls 4, and moving block 6 constitute a linear sliding bearing. 7 is a flange for transmitting the linear motion obtained by the ball nut 1, ball screw 2, and motor 8 to the housing 9 fixed on the moving block e, and 10 is the flange 7, the nozzle 9, and This is a stepped bolt that is fixed with a small gap a between the bolts. The shoulder bolt 10 has a length and a length regulating part.

The structural features of the moving table configured as described above will be explained.

The rotational motion generated by the motor 8 is converted into linear motion by the ball screw 2 and ball nut 1, and when transmitted to the moving block 6 and the no-Ujifugu 9, the length is adjusted by the stepped bolt 1o having a length regulating part. By tightening the flange 7 of the housing 9 with a small gap a, the ball nut 1 and the ball screw 2 are not restrained by the guide rail 3 and can move by the gap β in the radial direction, and the motor When the rotational motion generated by 8 is converted into a linear motion by the ball nut 1 and the ball screw 2 and transmitted to the moving block 6 and the nozzle 9, the ball screw 2 may be out of roundness or the assembly precision may be poor. Even if the parallelism between the ball screw 2 and the guide rail 3 deteriorates, the rotation torque is not affected because the ball nut 1 and the ball screw 2 move in the radial direction.

Effects of the Invention As described above, the present invention uses stepped bolts to tighten the ball nut and ball screw to the housing so that they can move in the radial direction. This provides a moving table that does not cause any impact.

[Brief explanation of the drawing]

Fig. 1 is a side view of a moving table according to an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a sectional view taken along cutting line A-A/ in Fig. 2, and Fig. 4 is a conventional FIG. 5 is a sectional view of the moving table, and FIG. 6 is a sectional view taken along cutting line B-B' in FIG. 6. 1...ball nut, 2...pole screw, 3...°° guide rail, 4...pole, 5...transfer groove, 6... ...Moving block, 7...Flange, 8...Motor,
9...Housing, 1o...River/stepped bolt.

Claims (1)

[Claims] A ball screw provided extending in one direction, a ball nut that converts the rotational movement of the ball screw into linear movement, a guide rail provided parallel to the ball screw, and a longitudinal direction of the guide rail. It has a moving block that is movable in the direction and forms a bearing between it and the guide rail, and a flange that connects the moving block and the ball nut, so that even if the axis of the ball screw swings, the bolt nut will not move. A moving table characterized in that a minute gap is provided between the moving block, the flange, and the ball nut so that the movement does not affect the flange.