JP3034895U - Double annular washer - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To improve the adhesive strength of a toothed washer to a slit disk such as a rotary encoder by improving the shape of the toothed washer, and to prevent the adhesive from protruding so that the adhesive can be efficiently used. Use and further improve the appearance. There is provided a double annular washer characterized in that a plurality of supporting members are formed from an inner peripheral annular member, and an outer peripheral annular member is provided so as to bridge the tips of the plurality of supporting members.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a double annular washer used for a rotary encoder, which is mounted between the slit disk and the retaining ring when the slit disk is fixed to the shaft by the retaining ring.

[0002]

[Prior art]

 The conventional rotary encoder has a slit disk 23 configured by arranging a plurality of radially extending slits along the circumferential direction as shown in FIG. 5, and sandwiching the slit disk 23. A light emitting element and a light receiving element (not shown) are arranged at opposite positions, and by rotating the slit disk 23, light from the light emitting element is intermittently timed through a plurality of slits, By receiving the intermittent light with the light receiving element, a pulse signal corresponding to the number of slits of the slit disk 23 is generated. When the slit disk 23 of this rotary encoder is fixed to the shaft 22 by the snap ring 24, a toothed washer 25 is attached between the slit disk 23 and the snap ring 24 to assist the fixing. . Then, the adhesive 26 is applied on the toothed washer 25 and the retaining ring 24 to increase the adhesive strength to the slit disk 23 and fix it more firmly.

[0003]

[Problems to be solved by the device]

 However, when the adhesive 26 was applied onto the toothed washer 25 and the retaining ring 24, the adhesive 26 exerted a force to fix only the vicinity of the inner periphery of the toothed washer 25 and the tooth portion. . In addition, the adhesive 26 spreads outside the outer circumference of the toothed washer 25, and the adhesive 26 rides on the slits and impedes the transmission of light, which causes a malfunction. Further, in order to prevent the adhesive 26 from getting onto the slit of the slit disk 23, the adhesive 26 is applied to the inner side, so that the adhesive strength is weak. Further, since the adhesive 26 spreads out from the outer periphery of the toothed washer 25, the adhesive 26 cannot be used efficiently and is visually unsightly.

The present invention has been made in view of the above-mentioned problems, and by improving the shape of the toothed washer 25, the adhesive strength of the adhesive 26 to the slit disk 23 is increased, and the adhesive 26 is prevented from protruding. By eliminating it, the purpose is to use the adhesive efficiently and to improve the appearance.

[0005]

[Means for solving the problem]

 In order to solve the above problems, the present invention provides a plurality of supporting members by an inner peripheral annular member, and an outer peripheral annular member is provided so as to bridge the tips of the plurality of supporting members. The present invention provides a double annular washer characterized by the above.

According to a second aspect of the present invention, the support member is formed in a radial shape to provide a double annular washer.

According to a third aspect of the present invention, there is provided a double annular washer, wherein the support member is formed at an angle with respect to a radial direction.

[0008]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a plan view of a double annular washer in which a supporting member is radially formed in the present invention. FIG. 2 is a diagram when the double annular washer is attached to the rotary encoder, FIG. 2 (a) is a sectional view thereof, and FIG. 2 (b) is a slit disk 5 seen from the axial direction thereof, and the double annular washer 1 is shown. And the part of the stopper 6 is shown. FIG. 3 shows a plan view of a double annular washer 1 according to the present invention. FIG. 4 shows a plan view of a conventional toothed washer 25. FIG. 5 shows a perspective view of a conventional toothed washer attached to a rotary encoder.

First, in FIG. 1, a double annular washer 1 has a plurality of supporting members 3 formed from an inner peripheral annular member 2, and an outer peripheral annular member 4 is provided so as to bridge the tips of the plurality of supporting members 3. The material of the double annular washer 1 is the same as that of a normal washer, and it is punched or etched from a thin metal plate. The double annular washer thus processed is attached to the rotary encoder as shown in FIG.

In FIGS. 2A and 2B, the rotary shaft 9 of the rotary encoder is configured to be rotatable by interposing a bearing 10 between the rotary shaft 9 and the housing 11. A light emitting element 15 is embedded in the housing 11. First, the slit disk 5 is pushed in and attached on the right flat surface of the housing 11. Next, the two annular washers 1 are attached to the rotary shaft 9 by passing through the shaft. Next, the retaining ring 6 is attached to the rotary shaft 9. Then, in order to prevent the slit disk 5 from moving on a plane perpendicular to the rotary shaft 9, a work of slit centering is performed in which all the parts attached to the rotary shaft 9 are pushed into the housing 11. After the slit centering is completed, the double annular washer 1 and the retaining ring 6 are fixed to the slit disk 5 by performing a bonding work described later. On the right side surface of the retaining ring 6, the light receiving element 14 integrated with the slit support 12 and the substrate 13 are screwed to the housing 11. A shaft hole 8 is formed in the rotary shaft 9, and the shaft of the motor is inserted into the shaft hole 8 for use.

In constructing the rotary encoder as described above, in the bonding work, the outer circumference of the retaining ring 6 is provided between the outer peripheral portion 4 and the inner peripheral portion 2 of the double annular washer 1 to which the slit disk 5 is fixed. The adhesive 7 is applied from above the part. Then, the adhesive 7 does not flow to the outside of the outer peripheral annular member 4 as shown in the adhesive 7 of FIG. 2B, so that the adhesive 7 can be easily applied. In addition to the inner peripheral annular member 2 and the support member 3, the adhesive 7 further fixes the fixing strength not only on the outer peripheral portion 4 having a large moment that serves as a force for suppressing the rotation about the shaft 8, but also on the outer peripheral portion 4. Then, when the motor shaft is inserted into the shaft hole 8 of the rotary encoder and the rotating shaft 9 is rotated by the operation of the motor by the action of the bearing 10, the slit disk 5 can be rotated without shaking, so The encoder can operate stably.

The adhesive strength when the double annular washer 1 according to this embodiment was used was measured, and it was found that the strength was improved by 60% or more as compared with the conventional one.

In the above embodiment, the support member 3 of the double annular washer 1 is formed radially from the inner peripheral annular member 2. However, as shown in FIG. 3, the support member 3 is not in the radial direction but in the radial direction. Alternatively, it may be configured to have a certain angle. In that case, the double annular washer 1 ′ has a configuration in which a plurality of supporting members 3 ′ are formed to have an angle with the radial direction from the inner peripheral annular member 2 ′, and the tips of the plurality of supporting members 3 ′ are bridged. Thus, the outer peripheral annular member 4'is provided. Since the support member 3'has an angle with respect to the radial direction as described above, the support member can be formed to be long, so that the joint side between the support member and the adhesive becomes long and the adhesive strength is further increased.

In this embodiment, the double annular washer is used for the rotary encoder. However, the double annular washer is not limited to the rotary encoder, and is the same as a normal washer. It can be used in various applications.

[0016]

[Effect of the invention]

 In this way, the washer is formed with a plurality of supporting members from the inner peripheral annular member, and the outer peripheral annular member is provided so as to bridge the tips of the plurality of supporting members. Since it does not flow out from the outer peripheral annular member, it is possible to easily apply the adhesive to the outer peripheral portion, and it is possible to more firmly fix the object to be fixed with a retaining ring or the like.

[Brief description of the drawings]

FIG. 1 is a plan view of a double annular washer in which a supporting member is radially formed according to the present invention.

FIG. 2 is a diagram when a double annular washer is attached to a rotary encoder, and FIG.
(B) shows the slit disc, the double annular washer, and the stopper as viewed from the axial direction.

FIG. 3 is a plan view of a double annular washer in which a supporting member is formed at a constant angle with respect to a radial direction in the present invention.

FIG. 4 shows a plan view of a conventional toothed washer.

FIG. 5 shows a perspective view of a conventional toothed washer attached to a rotary encoder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Double annular washer 2 ... Inner peripheral annular member 3 ... Supporting member 4 ... Outer peripheral annular member 1 '... Double annular washer 2' ... Inner peripheral annular member 3 '... Supporting member 4' ... Outer peripheral annular member

Claims (3)

[Utility model registration claims] 1. A double annular washer, wherein a plurality of supporting members are formed from an inner peripheral annular member, and an outer peripheral annular member is provided so as to bridge the tips of the plurality of supporting members. 2. The double annular washer according to claim 1, wherein the support member is radially formed. 3. The double annular washer according to claim 1, wherein the support member is formed at an angle with respect to the radial direction.