JPH04316753A - Drive device - Google Patents

Abstract

PURPOSE:To reduce the size of whole constitution by containing a servo motor, a turret, and a cam in the same casing. CONSTITUTION:A drive device comprises a turret 1 having a number of radially arranged rollers 2 and a cam engaged with each roller 2, the cam 5 being rotated with the aid of the servo motor 6. The turret 1, the cam 5, and the servo motor 6 are contained in the same casing 4. The cam 5 is formed in the shape of a cup in cross section, and the servo motor 6 has an outer rotor 6a.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device, and more particularly to a novel improvement for housing a servo motor, a turret, and a cam in the same casing to downsize the overall structure.

0002

2. Description of the Related Art There are various drive devices of this type that have been used in the past, and among them, the configuration shown in FIG. 3 is one that is generally employed.

[0003] In FIG. 3, what is indicated by numeral 1 is:
This turret has a large number of rollers 2 at radial positions on its outer periphery, and this turret 1 is configured to be rotatable within a casing 4 by a rotating shaft 3. A cam 5 that engages with each of the rollers 2 is rotatably provided inside the casing 4, and a rotating shaft 6a of a servo motor 6 attached to the outside of the casing 4 is connected to the cam 5. has been done. Therefore, in the above configuration, when the servo motor 6 is rotated, the turret 1 is rotated via the cam 5.

0004

[Problems to be Solved by the Invention] Since the conventional drive device was constructed as described above, the following problems existed. That is, since the servo motor 6 was externally attached to the outside of the casing 4, this drive device could not be miniaturized, which was the biggest obstacle in installing it inside a small device.

The present invention has been made to solve the above-mentioned problems, and in particular, provides a drive device in which a servo motor, a turret, and a cam are housed in the same casing, thereby reducing the overall structure. The purpose is to provide.

[0006]

A driving device according to the present invention includes a turret having a large number of rollers at radial positions, and a cam that engages each of the rollers, the cam being rotated by a servo motor. In the drive device, the turret, cam, and servo motor are housed in the same casing, the cam has a cup-shaped cross section, and the servo motor has an outer rotor.

[0007]

[Operation] In the drive device according to the present invention, the grooved cam fits on the outer periphery of the motor, and the turret, cam, and servo motor are housed in the same casing, so when the outer rotor type servo motor is rotated, The turret rotates via the cam to achieve a predetermined indexing motion, making it possible to achieve a significant reduction in size compared to conventional systems.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the driving device according to the present invention will be described in detail below with reference to the drawings. Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals. 1 and 2 show a drive device according to the present invention, with FIG. 1 being a sectional view and FIG. 2 being a sectional view taken along line A--A in FIG.

In the figure, a turret designated by the reference numeral 1 is a turret having a large number of rollers 2 at radial positions on its outer periphery. has been done.

[0010] Inside the casing 4, each of the rollers 2 is provided.
For example, the cam 5 made of a rib cam that engages with the bearing 3B
The cam 5 has a cup-shaped cross section.

[0011] An outer rotor 6a of an outer rotor type servo motor 6 is fitted into the recess 5a of the cam 5, and the servo motor 6 is provided within the casing 4 via a bearing 3C. There is.

In the above configuration, when the outer rotor 6a of the servo motor 6 is rotated, the cam 5 and the roller 2
The turret 1 can be rotated via the turret 1 to perform a predetermined indexing operation. In addition, since the backlash from the servo motor 6 to the cam 5 in the above-mentioned embodiment is made zero, high-speed operation is possible.

[0013]

Since the drive device according to the present invention is constructed as described above, the following effects can be obtained. In other words, since the outer rotor of the servo motor fits into the recess of the cam, the servo motor itself can be housed within the casing, making it possible to significantly reduce the size of the drive device, making it ideal for various devices. It can greatly contribute to the miniaturization of

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a drive device according to the invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view showing a conventional drive device.

[Explanation of symbols]

1 Turret 2 Roller 4 Casing 5 Cam 6 Servo motor 6a Outer rotor

Claims (1)

[Claims] 1. A turret (1) having a large number of rollers (2) at radial positions, and a cam (5) that engages each of the rollers (2), the cam (5) being driven by a servo motor ( 6
), in which the turret (1), the cam (5) and the servo motor (6) are housed in the same casing (4), and the cam (5) has a cup-shaped cross section. The servo motor (6) also has an outer rotor (6a).