JP2006064518A - Encoder system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the thickness of the entire system by superimposing the position of a circular disc on a bearing by bending a disc mount to be a cap shape. <P>SOLUTION: An end part (4a) of a hollow shaft (4) which is rotatably attached to a base (1) through the bearing (2) is provided with the cap-shaped disc mount (5). The circular disc (6) is attached to a collar part (5a) around the perimeter of the disc mount (5). The circular disc (6) is superimposed on the bearing (2) in the radial direction to achieve a thickness reduction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an encoder device, and more particularly to a novel improvement for reducing the axial height and reducing the thickness by forming a disk mount in a cap shape to cover a bearing and the like.

Conventionally used encoder devices of this type are not listed in the patent literature, but can be configured as shown in FIGS.
That is, what is indicated by reference numeral 1 in FIG. 3 and FIG. 4 is a base having a predetermined thickness and having a bearing hole 3 for holding the bearing 2. 4 is rotatably supported.

  A ring-shaped disk 6 is provided at an outer peripheral position of the end 4 a of the hollow shaft 4 via a ring-shaped disk mount 5, and a first optical element 10 for light emission and a light receiving element are disposed on the upper surface of the base 1. An optical unit 12 having a second optical element 11 is attached.

  The annular disk 6 is inserted into a groove 13 formed in the optical unit 12 in a superposed state, and the optical elements 10 and 11 are configured to sandwich the annular disk 6. The base 1 is provided with a cap-shaped cover 14 for covering the hollow shaft 4 and the optical unit 12.

Since the conventional encoder device is configured as described above, the following problems exist.
That is, an annular disk is mounted on the end surface of the disk mount provided on the end surface side of the bearing, and the optical unit in a state of sandwiching the annular disk is provided at the end surface position of the base. It is difficult to reduce the height of the encoder device, and it is difficult to obtain a so-called thin encoder device.

  An encoder apparatus according to the present invention includes a hollow shaft rotatably provided on a base via a bearing, a first optical element positioned on the base side, and a disk mount provided at an end of the hollow shaft. An encoder device comprising a ring-shaped disc provided on the disc mount and a second optical element provided opposite to the first optical element, wherein the bearing has an L-shaped section having an L-shaped cross section. The ring-shaped disc is provided on the flange portion of the disc mount whose cross-sectional shape forms a cap shape, the disc mount covers the bearing and the L-shaped portion, and the outer end surface of the disc mount is the L The second optical element is mounted on the base via a mounting screw and is positioned outside the ring-shaped disc. Provided holding plates, said the base is a structure in which a cap-like cover is provided.

Since the encoder device according to the present invention is configured as described above, the following effects can be obtained.
That is, since the cap-shaped disk mount having a ring-shaped disk on the outer peripheral side covers the outside of the L-shaped portion that holds the outer ring of the bearing, the position of the ring-shaped disk in the axial direction of the hollow shaft is moved to It is possible to superimpose each other in the direction, and the axial length of the entire device, that is, the total height is significantly shortened, and a thin encoder device can be obtained.

  The present invention relates to a novel improvement for reducing the height of an encoder device and making it thin by covering a disk mount having a ring-shaped disk with a cap shape and covering the outer ring side of a bearing.

Hereinafter, preferred embodiments of an encoder device according to the present invention will be described with reference to the drawings.
The same reference numerals are used for the same or equivalent parts as in the conventional example.
In FIG. 1 and FIG. 2, a reference numeral 1 indicates a base having a thick plate shape as a whole, and a cylindrical shape is formed in the bearing hole 3 at the center of the base 1 through a bearing 2. A hollow shaft 4 is rotatably provided.

  The end 4a of the hollow shaft 4 is integrally provided with a disk mount 5 whose overall cross-sectional shape is a cap shape. The flange 5a formed on the outer periphery of the disk mount 5 is provided with a ring-shaped disk 6. The disk mount 5 is configured such that a cross-sectional shape for holding the bearing 2 and the bearing 2 of the base 1 covers an L-shaped portion 20 having an L-shape.

The outer end surface 5 b of the flange portion 5 a of the disk mount 5 is located outside the outer peripheral surface 1 a of the L-shaped portion 20 outside the bearing 2.
A support plate 23 is fixed on the base 1 via a plurality of mounting screws 21 and a collar 22, and the disk mount 5 passes through an opening 24 formed in the support plate 23 to be rotatable. .

  A first optical element 10 made of a light emitter is provided on the bottom surface 1 b of the base 1, and the inner surface of the support plate 23 is placed on the inner surface of the support plate 23 directly from the light receiver in a state of facing the first optical element 10. The second optical element 11 is provided.

Each of the optical elements 10 and 11 can be mounted with a light emitter and a light receiver in a configuration opposite to that described above.
A cover 14 having a cap shape as a whole is provided on the base 1, and the cover 14 is configured to cover the hollow shaft 4, the disk mount 5, the ring-shaped disk 6, and the support plate 23. ing.

As shown in FIG. 2, the bent portion 5c of the disc mount 5 extends along the outer peripheral surface 1a of the L-shaped portion 20, and the ring-shaped disc 6 is provided on the flange portion 5a. Thus, the mounting position of the ring-shaped disc 6 is configured to overlap each other in the radial direction of the hollow shaft 4 with respect to the bearing 2.
Therefore, by holding the annular disk 6 at a position overlapping the bearing 2, the base 1 is thinned, the axial length of the hollow shaft 4 is shortened, the bearing 2 is miniaturized, etc., and the encoder device 50 is achieved. Overall thinning has been achieved.

  The present invention is not limited to an encoder device, and can also be applied to a winding type sensor.

It is sectional drawing which shows the encoder apparatus by this invention. It is an expanded sectional view of the principal part of FIG. It is sectional drawing of the conventional encoder apparatus. It is an expanded sectional view of the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Bearing 4 Hollow shaft 5 Disk mount 5a Eave part 5b Outer end surface 6 Ring-shaped disk 10 1st optical element 11 2nd optical element 14 Cover 20 L-shaped part 23 Support plate 50 Encoder apparatus

Claims (2)

A hollow shaft (4) rotatably provided on a base (1) via a bearing (2), a first optical element (10) positioned on the base (1) side, and the hollow shaft (4 ) Provided at the end (4a) of the disc mount (5), the annular disc (6) provided on the disc mount (5), and the first optical element (10). In the encoder device comprising the second optical element (11),
The bearing (2) is held by an L-shaped part (20) having an L-shaped cross section, and the annular disk (6) is a flange (5a) of the disk mount (5) having a cap-shaped cross section. The disk mount (5) covers the bearing (2) and the L-shaped part (20), and the outer end surface (5b) of the disk mount (5) is formed on the L-shaped part (20). The encoder device is characterized in that it is positioned outside the outer peripheral surface (1a).   The second optical element (11) is attached to the base (1) via a mounting screw (21) and is provided on a support plate (23) positioned outside the annular disk (6). The encoder device according to claim 1, wherein a cap-shaped cover (14) is provided in (1).

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