JP2519765Y2 - Rotarian Coder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary encoder for converting a mechanical rotation amount into an electric signal.

[0002]

2. Description of the Prior Art FIG. 4 shows a conventional rotary encoder, in which 1 is a case 1A and 1 is a shaft insertion hole.
In the housing consisting of a lid 1C having B, a shaft 3 is rotatably supported in the insertion hole 1B of the cover 1C via two sets of bearings 2 and 2, and the shaft end of the shaft 3 is inside. A rotary slit plate 4 having a large number of slits is fixed to the side thereof, and a circuit board 6 having a light projecting element 5 mounted inside the case 1A on the inner side of the rotary slit plate 4 is fixed.
And a light projecting element 5 of the rotary slit plate 4
A circuit board 9 having a light receiving element 8 is arranged on the opposite side to the fixed slit plate 7.

Further, the rotary slit plate 4 is attached to the shaft 3
When fixing to the side, the rotary slit plate receiving member 10 is fixed to the shaft 3 by press fitting or adhering means, and the rotary slit plate 4 is inserted into the shaft end side of the shaft 3 so as to be in contact with the receiving member 10. At the same time, a CS type snap ring 11 is inserted and locked onto the shaft 3 to make the snap ring 1
1 presses the rotary slit plate 4 to the member 10 side,
Further, the two-liquid type adhesive A is applied to the entire outer surface of the retaining ring 11. In the figure, 12 is a stopper ring for fixing the bearing 2, 13 is a residual pressure applying screw for applying a predetermined residual pressure to the bearing 2, and 14 is a code.

[0004]

However, in the fixing means as described above, since the fixing strength of the rotary slit plate 4 to the shaft 3 side is insufficient, the rotary slit plate 4 rotates / rotates with the shaft 3. When the stop operation is performed, the adhesive A is elastically deformed by the inertial force of the rotary slit plate 4, so that the shaft 3 and the rotary slit plate 4 relatively move relatively, but a detection error occurs. There was a problem to do. This invention was made in order to solve the above problems, the rotary slit plate can be firmly fixed to the shaft side, without detecting the relative movement between the rotary slit plate and the shaft, it can be detected. It is an object of the present invention to provide a rotary encoder that can improve accuracy.

[0005]

In the rotary encoder according to the present invention, at least one or more adhesive accumulating holes are provided in a penetrating manner at the facing portion of the receiving member and the retaining ring in the rotary slit plate. It is characterized by

[0006]

When fixing the rotary slit plate to the shaft side, the adhesive is injected into the shaft through the pool hole by inserting the adhesive into the pool hole penetrating the rotary slit plate. Between the retaining ring and the rotary slit plate, and between the rotary slit plate and the receiving member fixed to the shaft, respectively, so that the face-to-face adhesive state is established between the respective members, and the rotation is performed. The slit plate is firmly fixed to the shaft side.Therefore, when the rotary slit plate is rotated / stopped, relative movement does not occur between the rotary slit plate and the shaft, and detection accuracy is improved. Is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 shows the rotary encoder according to the present invention.
4 shows the entire structure of the da, and the basic structure thereof is the same as that of the above-described conventional FIG. 4, so a detailed description thereof will be omitted, and the same components will be denoted by the same reference numerals. FIG.
4 is different from the one shown in FIG. 4 in the fixing structure for fixing the shaft 3 and the rotary slit plate 4.
Further, in this invention, at least one or more adhesive agent accumulating holes 15 are formed in a penetrating manner in the facing portion of the receiving member 10 and the retaining ring 11 in the rotary slit plate 4.

More specifically, as shown in FIG. 2, the rotary slit plate 4 is provided with a mounting hole 41 for inserting the shaft 3 into the shaft 3, and an outer peripheral portion of the light projecting element. 5 is provided with a slit forming portion 42 in which a large number of slits are formed, and the pool hole is formed at an intermediate portion between the mounting hole 41 and the slit forming portion 42 of the rotary slit plate 4. Four pieces of 15 are penetratingly formed at equal intervals in the circumferential direction.

Further, as shown in FIG. 3, the retaining ring 11 is provided with a plurality of locking pieces 11a, which are locked to the outer peripheral wall surface of the retaining ring 11 at the central portion when the shaft 3 is inserted into the shaft 3, in a close proximity to each other. Is formed. Further, the retaining ring 11
Is formed in a circular shape having substantially the same size as the outer diameter of the receiving member 10, and the pressing region of the retaining ring 11 against the rotary slit plate 4 is on the inner side surrounded by the line B in FIG. It is formed so as to be located on the outer peripheral side of each of the reservoir holes 15 at an intermediate portion between the mounting hole 41 and the slit forming portion 42.

Then, when the rotary slit plate 4 is fixed to the shaft 3 side, the rotary slit plate 4 is inserted into the shaft 3 so as to be in contact with the side surface of the receiving member 10, and the rotary slit plate 4 is fixed. The adhesive A is injected into each of the pool holes 15, and the rotary slit plate 4 in the shaft 3 is inserted.
When the retaining ring 11 is press-fitted and locked to the outside of the container, the adhesive A injected into each of the reservoir holes 15 wraps around between the contacting portion between the retaining ring 11 and the rotary slit plate 4. ,
Further, the rotary slit plate 4 and the receiving member 10 wrap around between the facing portions, and the face-to-face adhesive state is established between these members, so that the rotary slit plate 4 is firmly fixed to the shaft 3 side. Therefore, when the rotary slit plate 4 is rotated / stopped, relative detection does not occur between the rotary slit plate 4 and the shaft 3, and the detection accuracy is improved.

As the adhesive A to be injected into each of the reservoir holes 15, a one-liquid quick-drying type adhesive can be used, that is, the one-liquid quick-drying type adhesive A is a conventional two-liquid type. Although the adhesive strength is inferior to that of the one type, in the present invention, as described above, the fixing strength of the rotary slit plate 4 to the shaft 3 can be structurally enhanced, so that even the one liquid quick drying type is used. Even if is used, sufficient strength compensation can be performed. Therefore, when the conventional two-liquid type adhesive is used, the mixing and coating work is complicated, which is a hindrance to cost reduction and mechanical production. In the present invention, complicated assembling work is not required, the assembling workability is improved, the cost can be reduced, and it is very convenient for mechanical production.

[0012]

As described above, according to the rotary encoder of the present invention, at least one or more adhesive accumulating holes are penetrated in the opposing portion of the rotary slit plate between the receiving member and the retaining ring. Since it is provided in the shape of a hole, it is possible to bond the rotary slit plate and the retaining ring and the rotary slit plate and the receiving member in a face-to-face state with the adhesive injected into the reservoir hole. Since the slit plate can be firmly fixed to the shaft side, the detection accuracy can be improved without causing relative movement between the rotary slit plate and the shaft.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary encoder according to the present invention.

FIG. 2 is an enlarged front view of a rotary slit plate.

FIG. 3 is an enlarged perspective view of a retaining ring.

FIG. 4 is a cross-sectional view showing a conventional rotary encoder.

[Explanation of symbols]

 3 Shaft 4 Rotating slit plate 10 Rotating slit plate receiving member 15 Reservoir hole A Adhesive

Claims (1)

(57) [Scope of utility model registration request] 1. A rotary encoder comprising a rotary slit plate receiving member fixed to a shaft and a rotary slit plate fixed to the receiving member via a retaining ring.
A rotary encoder which is characterized in that at least one or more adhesive accumulating holes are provided in a penetrating manner at a facing portion of the receiving member and the retaining ring in the rotary slit plate.