JPS59151615A - Vertical turning equipment - Google Patents

Abstract

PURPOSE:To precisely turn an OCR polyhedral mirror turning equipment at a noiseless high speed by supporting a turning body by means of a pair of spirally grooved spherical bearings which are disposed in the position above the center of gravity of the turning body. CONSTITUTION:A turning body 10 is supported by a supporting body 14 via a bearing stem 17 at the holding point of a pair of spirally grooved spherical bearings 20. With the center of the sphere of the bearings positioned above the center of the gravity of the turning body, the body is turned by the actions of a rotor 11 and a stator 16, whereby providing extremely stable ability of supporting the turning body and high speed turning due to high alinement performance of the spirally grooved spherical bearings 20. The turning equipment may make high speed and high precision turning without any creation of vibration and noise, and so on. Since the equipment does not have bearing devices disposed in two positions, it may have no adverse effect on its operation due to mis-alinement, be assembled with ease and be reduced in power loss.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical rotating device, and particularly to a vertical rotating device that requires high-speed, high-precision rotation.

Recently, 00
R(0ptical 0haraater Read
r; optical character reading device) is becoming popular. This O
In OR, a laser scanner is often used as a photoelectric conversion unit that converts data (characters) into black and white pattern signals. At this time, a polyhedral mirror rotation device is used to deflect the laser beam, and as data is processed at high speed and in large quantities, a very high speed and high precision rotation device is required.

FIG. 1 shows a conventional general vertical rotating device, in which a rotor shaft 2 equipped with a rotor 1 is connected to upper and lower rolling bearings 3.
, 4, and is supported by a housing 6 equipped with a stator 5. FIG. A spherical spiral grooved bearing 7 is provided between the two.
The upper end of the rotor shaft 2 is supported by a housing 6 via a cylindrical spiral grooved bearing 8 (hydrodynamic bearing) or a sintered metal bearing (not shown). Because it is supported by bearings, 1. .

In high-speed rotation, there are problems in terms of generation of vibrations and sounds due to the transfer of the rolling elements, and there is a limit to the high-speed rotation speed. Furthermore, the one shown in FIG. 2 has problems with assembly accuracy, particularly eccentricity accuracy of the upper and lower bearings, and high-speed stability of the upper bearing (cylindrical spiral grooved bearing or sintered metal bearing).

The purpose of this invention is to provide a vertical rotating device for high-speed rotation as described above, which is capable of high-speed, high-precision rotation and is quiet. It is characterized in that it is supported by a grooved bearing and that the center point of the ball of the bearing is located above the center of gravity of the rotating body.

The present invention will be described in detail below with reference to the embodiment shown in FIG.

The rotating body 10 includes a rotor 11, a rotor shaft 12, and a multifaceted boundary 13 fixed to the shaft 12, and the rotor shaft 12 is a hollow shaft.

The support body 14 consists of a housing 15, a stator 16 arranged around the rotor 11 and fixed to the housing 15, and a bearing column 17 provided upright at the center of the inner bottom of the housing 15. , its diameter is smaller than the inner diameter of the hollow part 18 of the rotor shaft 12 so that it can be inserted into the hollow part 18.

A ball portion 19 is attached to the upper end of the hollow portion 18 of the rotor shaft 12.
Shaft member 2 of the spherical spiral grooved bearing 20 with the
1 is attached and fixed, and the receiving member 2 has a concave spherical surface of the bearing 20.
2 is attached and fixed to the upper end of the bearing column 17, and the shaft member 2
1 is inserted into the concave spherical surface of the receiving member 22 to rotatably support the rotating body 10 on the supporting body 14, and the center of the sphere of the spherical spiral grooved bearing 200 is aligned with the center of gravity of the rotating body 10. Position it higher up.

As is well known, the spherical spiral grooved bearing 20 includes the lower half of the shaft member 210 and the spherical portion 19 +i! IT surface or receiving member 22
A large number of spiral grooves are carved in the concave spherical surface of the spherical part 19, and by the rotation of the grooves, lubricant is forcibly introduced between the spherical part 19 and the concave spherical surface,
This is a hydrodynamic bearing in which a film of pressurized lubricant is formed to maintain the opposing bearing surfaces of a spherical portion and a concave spherical surface in a non-contact manner, and the details thereof are well known and will not be described here. Therefore, at the upper end of the bearing column 17 that supports the receiving member 22, it is preferable to provide a lubricant reservoir 23 that surrounds the outer periphery of the shaft member 21 of the spherical spiral grooved bearing 20 to an appropriate height and stores the lubricant.

The present invention has the above-mentioned structure, in which the rotating body is supported by a set of spherical spiral grooved shafts on the supporting body, and the ball center metal of the bearing is positioned above the center of gravity of the rotating body. Because of this, even though the rotating body is supported by only one set of bearings, its support is extremely stable. In addition, as is well known, spherical spiral grooved bearings have extremely high alignment, are capable of high-speed rotation, do not generate vibration or noise during rotation, and have excellent performance as high-speed, high-precision rotating equipment. Therefore, in a vertical rotating device, by placing it above the center of gravity of the entire spherical rotating body, the stability and rotational accuracy are dramatically improved compared to the conventional one, and it is similar to the conventional device with a bearing device at the zfrA location. Moreover, there are no problems caused by eccentricity.

This invention that I received supports the rotating body with only one set of bearings, so it is easy to assemble, there is no misalignment, and power loss is reduced to about half compared to the conventional one.
It is also significantly more advantageous in terms of cost than the one shown in FIG.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views showing conventional examples, respectively.
The figure is a longitudinal sectional view of an embodiment of the invention. DESCRIPTION OF SYMBOLS 10... Rotating body, 11... Rotor, 12... Rotor shaft (rotating shaft), 14... Support body, 15...
Housing, 16... Stator, 17... Bearing strut, 18... Hollow part, 19... Spherical part, 20... Spherical spiral grooved bearing, 21... Shaft member, 22... Receiving member, 23...Lubricant reservoir Applicant Koyo Seiko Co., Ltd. Agent Goho - Keiharu. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) The rotating body is supported by a support body through a pair of spherical spiral grooved bearings, and the spherical center of the spherical spiral grooved bearing is located above the center of gravity of the rotating body. A vertical rotating device (2) characterized in that the bearing is arranged so that the rotating body includes a rotating shaft made of a hollow shaft, and the support body is an upright bearing column inserted into the hollow part of the rotating shaft. The shaft member of the spherical spiral grooved bearing is mounted on the upper end of the hollow part of the rotating shaft with the spherical part facing downward, and the receiving member with the concave spherical surface of the bearing is mounted on the bearing strut. The receiving member of the spherical spiral grooved bearing (vertical rotating device (3) according to claim 11) attached to the upper end is attached to the inner bottom of the lubricant reservoir formed at the upper end of the bearing column. A vertical rotating device (4) according to claim (2), wherein the rotating body includes a rotor and a rotor shaft of an electric motor, and the support body forms a housing of the electric motor, and the rotating body is arranged around the rotor. Vertical rotating device according to any one of claims +11 to (3), including a stator arranged