JPH01216739A - Couple type rotation transmitting mechanism - Google Patents

Abstract

PURPOSE:To enable a couple rotation driving applying no displacement load to a main spindle with a simple structure by stretching a belt between first rollers so as to bring second rollers into contact with the belt and transmitting the rotation of a driving pulley to a face plate via the belt. CONSTITUTION:A face plate 10 is fixed to the end of a main spindle 2 and the setting angle thereof is restricted by a positioning pin 12. Rollers 13A are rotatably supported at equally divided three intervals on the circumference of the rear end face of the face plate 10 and rollers 13B are rotatably supported at equally divided three intervals on the circumference with their phases being shifted by means of supporting pins 14, and the rollers 13A, 13B are brought into contact with the outside of two separate positions which are symmetrical to the center of each side of the triangle of a belt 8. Thereby, the turning force of the pulley 3 is transmitted to the main spindle 2 via the belt 8, rollers 13A, and the face plate 10 and, since the rotation is averagedly transmitted by the flexible belt 8, no lopsided load is applied to the main spindle, enabling smooth rotation even with respect to a suddenly applied load.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotation transmission mechanism such as a universal headstock of a grinding machine.

Conventional technology In conventional universal headstocks, rotation is transmitted to the spindle by engaging a drive pin installed on the front end of the driving pulley with a face plate fixed to the tip of the driven spindle. .

Problems to be Solved by the Invention Conventionally, the rotational force transmitted by the drive pin acts as a force that bends the main shaft, causing a decrease in rotational accuracy. There was a problem with the table.

The present invention was made in view of the problems existing in the prior art, and its purpose is to provide a mechanism that has a simple structure and realizes a complete couple rotation drive that does not apply a displacement load to the main shaft. It is something.

Means for Solving the Problems In order to achieve the above object, the couple rotation transmission mechanism of the present invention has a plurality of first rotating rollers attached to the front end surface of the driving pulley, and a plurality of first rotating rollers attached to the rear end surface of the face plate fixed to the tip of the main shaft. A plurality of second rotating rollers are also installed, and a belt is stretched between the first rollers so that the second rollers come into contact with the outer periphery, and the rotation of the driving pulley is transmitted to the face plate via the belt. It's ours.

A belt stretched in a triangular shape rotates around the outer periphery of three rollers parallel to the main shaft axis, which are placed at equal intervals of three parts of the circumference on the front end of the drive-side pulley, and abuts each side of the triangle of this belt. The face plate is rotated via a plurality of rollers attached to the rear end face of the face plate, and the main shaft is smoothly rotated without applying an unbalanced load.

Embodiment An embodiment will be explained with reference to FIGS. 1 and 2. In a universal headstock of a grinding machine, a main spindle 2 is rotatably supported on a headstock main body l by a hydrostatic bearing. A pulley 3 is rotatably supported by a bearing (not shown) provided on the main body 1 concentrically with the main shaft 2, and the pulley 3 is rotated by a belt stretched between it and a drive shaft pulley (not shown).

Further, a drive ring 4 is fixed to the front end surface of the pulley 3, and three rollers 5 whose axes are parallel to the main shaft axis are rotatably supported at three equal intervals on the circumference of the front end surface of the drive ring 4. One of the three rollers is fitted into an eccentric collar 7 fixed by a mounting pin 6. A belt 8 is stretched between each roller in a triangular shape, and by adjusting the rotational position of the eccentric collar 7 described above, the tension tIi!
The belt tension can be adjusted to be the same all around due to the rotatable roller 5.

On the other hand, a face plate 10 is fixed to the tip of the main shaft 2 by bolts 11, and the mounting angle is regulated by positioning pins 12.

And the face! Rollers 13A are rotatably supported on the rear end surface of JilO at three equal intervals on the circumference, and rollers 13B are rotatably supported on the same circumference at three equal intervals with a phase shift. 8 and 13B are in contact with the outer sides of the belt B at two symmetrical and distant positions with respect to the center of each side of the triangle. In this way, the rotational force of the pulley 3 is transferred to the belt 8. The rotational force is transmitted to the main shaft 2 via the roller 13A1 face plate 10, and is transmitted after being averaged by the flexible belt 8, so there is no uneven load on the main shaft and it can withstand sudden loads. Achieves smooth rotation. Furthermore, roller 1
3B is for preventing overrun when the main spindle 2 stops.

Further, a chuck 16 is attached to the front end surface of the face plate 10 via a bank plate 15, and a cover 17 is fixed to the end surface near the outer periphery of the face plate 10, and a cover 17 is fixed to the front end surface of the main body 1. The gap with the ring 19 acts as a labyrinth seal to prevent dust from entering.

If you wish to change to a dead center, remove the aforementioned transmission mechanism and attach the single-turn drive arm to the front end of pulley 3.
The objective is achieved by clamping the main shaft 2 so that it cannot rotate.

Effects Since the present invention is configured as described above, it has the advantage that a highly accurate universal headstock with a spindle rotation accuracy of 0.1 μm under a steel plate can be put to practical use.

[Brief explanation of the drawing]

FIG. 1 is a cutaway view of a main part of a universal headstock representing a couple-type rotation transmission mechanism of the present invention, and FIG. 2 is an explanatory diagram of the roller arrangement seen from the side in FIG. 1. 3...Pulley 8...Belt 5.13A, 13B...Roller 10...Face plate

Claims (1)

[Claims] (1) A plurality of first rotating rollers (5) are attached to the front end surface of the drive-side pulley (3), and a face plate (10) is fixed to the tip of the main shaft.
A plurality of second rotating rollers (13A, 13B) are also provided on the rear end surface.
A belt (8) is stretched between the first rollers (5) so that the second rollers (13A, 13B) come into contact with the outer periphery, and the rotation of the driving pulley (3) is controlled by the belt (8). A couple type rotation transmission mechanism characterized in that transmission is transmitted to a face plate (10) via.