JP3533270B2 - Encoder mounting structure and encoder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoder mounting structure and an encoder, and more particularly to a new improvement for enabling the rotary shaft of an encoder and the motor shaft of a motor to be separated from each other by simply loosening a mounting screw.

[0002]

2. Description of the Related Art As an encoder attachment / detachment method of this type which has been conventionally used, for example, a method disclosed in Japanese Patent Publication No. 7-65906 can be cited. That is, "a first tap hole is screwed in the axial direction of a cylindrical coupling portion having a rotary code plate, and an encoder tightening screw having an outer diameter smaller than that of the first tap hole is attached to the first tap hole. Insert the rotary disk from the mounting side to the taper side, punch a second tap hole in the central axis of the taper that engages with the tightening screw, and screw the tightening screw into this to attach the encoder to the shaft. The tightening screw is removed, and the removal screw that engages with the first tap hole of the coupling portion is made to enter the taper side from the rotary disk mounting side of the first tap hole, and the tip head of this removal screw. The encoder attachment / detachment method is characterized in that the encoder is removed by still rotating the attachment screw in the traveling direction even after the contact with the shaft end.

[0003]

Since the conventional encoder attachment / detachment method is configured as described above, the following problems exist. That is, a screw hole for removing the encoder must be formed on the rotary shaft of the encoder,
In addition, the encoder tightening screw and the detaching screw for detaching the encoder have to be used, so that the structure is complicated and it takes time to attach and detach.

The present invention has been made to solve the above problems, and in particular, an encoder mounting structure in which the rotary shaft of the encoder and the motor shaft of the motor can be separated from each other by simply loosening the mounting screw. The purpose is to provide an encoder.

[0005]

In the encoder mounting structure according to the present invention, a taper hole of a rotary shaft rotatably provided on a base through a bearing and having a rotary code plate is fitted into a taper portion of a motor shaft of a motor. In the encoder mounting structure that is made to mate with each other, they are screwed together to form the rotary shaft.
Formed on the first and second hollow rotary shaft parts combined with each other and the rotary shaft
First and second step portions that are engaged with the bearing, and the first middle
A through hole which is provided in the idle rotation shaft portion and communicates with the tapered hole having a hole end portion, and a through hole formed in the end portion of the first hollow rotation shaft portion.
And an open end located in the second hollow rotary shaft portion and a screw portion that penetrates the through hole and is screwed into a screw hole of the motor shaft.
Has only on the tip side and other parts are straight non-threaded parts.
Formed mounting screw and formed on the end of the mounting screw
A head that is larger in diameter than the mounting screw and contacts the opening end
Between the threaded portion and the non-threaded portion of the mounting screw.
A flange body that is provided in the diameter portion and that is formed of an expandable ring and that is located in the tapered hole, and a configuration that includes a connection plate that is provided in the base and that is connected to the motor,
The encoder according to the present invention includes a rotating shaft having a rotating code plate rotatably provided through a bearing on a base, wherein
First, first screwed to each other to form an axis of rotation
2 Hollow rotating shaft portion and the bearing formed on the rotating shaft
First, a second stepped portion, and the through-hole and the taper hole formed in the first hollow rotation shaft is formed in the tapered hole of case
Formed on the end of the hole and the end of the first hollow rotary shaft
The opening end located in the second hollow rotary shaft portion, the light emitter and the light receiver provided to face the rotary code plate, and the screw hole of the motor shaft that is provided so as to penetrate the through hole. You
Has a threaded part only on the tip side, and other parts are straight
The mounting screw formed by the screw and the end of the mounting screw
Is formed and has a diameter larger than that of the mounting screw and is in contact with the opening end.
A head portion that contacts, the threaded portion and the non-threaded portion of the mounting screw
If it consists of a ring that is provided in the small diameter part between
And a flange body located in the tapered hole.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an encoder mounting structure and an encoder according to the present invention will be described in detail below with reference to the drawings. A reference numeral 1 in FIG. 1 denotes a base having a pair of bearings 2 and 3, and the bearings 2 and 3 have a cylindrical rotary shaft 4 in a state of penetrating the base 1.
Is rotatably provided. That is, the rotating shaft 4
Are first and second hollow rotary shafts that are connected to each other by screws 4A.
It consists of parts 4a and 4b, and each hollow shaft
A pair of first and second stages formed by the shaft portions 4a and 4b
Parts 4B and 4C are provided. These steps 4B, 4C
Is engaged with the bearings 2 and 3 and the rotary shaft 4 is rotatably provided.
ing. A straight through hole 5 which is not a screw hole and which penetrates the rotary shaft 4 is formed in the rotary shaft 4, and a tapered taper hole 6 is formed in communication with the through hole 5. The second hollow rotary shaft portion 4b is provided at the end of the through hole 5.
An opening end 5 a located inside is formed, and the tapered end 6 of the tapered hole 6 is formed.
A hole end 6a is formed at the end.

The through hole 5 has a threaded portion 7 only on the tip side.
A mounting screw 7 formed of a straight non-threaded portion 7b having a is rotatably provided on the other portion.
A groove body 9 formed of a well-known E-ring or C-ring is provided in the groove-like narrow-diameter portion 8 formed in the small-diameter shape, and the flange body 9 has the tapered portion. Located within 6. Formed at the end of the mounting screw 7
The head portion 7A that has come into contact with the open end 5a and is attached
The flange body 9 is formed to have a diameter larger than that of the screw 7.
It is configured to come into contact with the hole end portion 6a.

A printed circuit board 11 is provided on the base 1 via a support column 10, a light receiving body 12 is provided on the back surface of the printed circuit board 11, and a well-known rotation code provided on the rotary shaft 4 is provided. A plate 13 is located in contact with the light receiving body 12, and a well-known fixed slit plate 14 fixed to the support column 10 side is held in a state of being extremely close to the rotary code plate 13. A light emitter 15 made of an LED is provided on the base 1 side, and light from the light emitter 15 is received by a light receiver 12 via a fixed slit plate 14 and a rotary code plate 13. . In addition, this rotary code plate 1
3 may be of a magnetic type when it is not an optical type.

The screw portion 7a of the mounting screw 7 is rotatably held by a well-known motor 21 and a motor case 22 which are connected to the base 1 through a well-known elastic connecting plate 20, and has a taper portion 23b. Screw hole 23a of the motor shaft 23 having
It is screwed to. Therefore, in the state of FIG. 1, when the mounting screw 7 is tightened, the rotary shaft 4 and the motor shaft 23 are fastened, and when the mounting screw 7 is loosened, the screw portion 7a is disengaged from the screw hole 23a and the flange body 9 is removed. Hole end 6 of taper hole 6
Since it comes into contact with a, if you loosen this mounting screw 7,
The rotary shaft 4 can be separated from the motor shaft 23 by the flange body 9. That is, the encoder 30 and the motor 21 can be attached and detached by tightening and loosening only one mounting screw 7 attached to the encoder 30 described above.

[0010]

Since the encoder mounting structure and the encoder according to the present invention are configured as described above, the following effects can be obtained. That is, the encoder and the motor can be freely connected and disconnected by the mounting screw that is rotatably provided on the rotary shaft of the encoder and has the flange body. As in the conventional case, two screws having different diameters are used. In addition, it is not necessary to provide a screw hole in the rotary shaft of the encoder, and a simple and inexpensive mounting structure can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an encoder mounting structure according to the present invention.

FIG. 2 is an enlarged configuration diagram showing a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base 2, 3 Bearing 4 Rotating shaft 4a 1st hollow rotating shaft part 4b 2nd hollow rotating shaft part 4A screw 4B 1st step part 4C 2nd step part 5 through hole 5a opening end 6 taper hole 6a hole end 7 Mounting screw 7a Threaded portion 7b Non-threaded portion 8 Small diameter portion 9 Flange body 12 Light emitting body 13 Rotating code plate 14 Light receiving body 20 Connection plate 21 Motor 23 Motor shaft 23a Screw hole 23b Tapered portion

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01D 5/00-5/62 G01B 7/00-7/34 G01B 21/00 G01B 5/00-5 / 30

Claims (2)

(57) [Claims] 1. A base (1) can be freely rotated via bearings (2, 3).
The taper of the rotating shaft (4) provided on the
Insert the hole (6) into the tapered portion (23b) of the motor shaft (23) of the motor (21).
In the encoder mounting structure that is made to fit,Previous
Rotary axis (Four) Screwed together to form (4A) Combined with
First and second hollow rotary shafts (4a , 4b) And the rotating shaft (Four)
Formed on the bearing (2 , 3) First and second step portions engaging with (Four
B , 4C) When,The aboveFirst hollowAxis of rotationDepartment (4a)Hole edge
(6a) HaveA through hole (5) communicating with the tapered hole (6),
The first hollow rotary shaft portion (4a) Formed at the end of the second middle
Idle shaft (4b) Open end located inside (5a) When,The through hole
It is penetrated by (5) and screwed into the screw hole (23a) of the motor shaft (23).
RuScrew part (7a) Has only on the tip side and other parts are straight
Non-threaded part (7b) Formed byMounting screw (7),Installation
screw (7) The mounting screw formed on the end of (7) Larger than
And the open end (5a) Head to abut (7A) When,The installation
Ji (7)The threaded portion of (7a) And non-threaded part (7b) Small diameter section between
(8) It is equipped with a ring that can be expanded andThe above
Flange body (9) located in the hole (6) and the base (1)
And the connection plate (20) connected to the motor (21)
Encoder mounting structure characterized by being equipped. 2. The base (1) is rotatable via bearings (2, 3)
A rotary shaft (4) provided with a rotary code plate (13),The above
Axis of rotation (Four) Screwed together to form (4A) Combined with
First and second hollow rotary shafts (4a , 4b) And the rotating shaft (Four) To
Formed bearing (2 , 3) First and second step portions engaging with (Four
B , 4C) When,The aboveFirst hollowAxis of rotationDepartment (4a) Penetration formed in
Hole (5) and taper hole (6),The taper hole (6) Formed in
A hole end (6a) And the first hollow rotary shaft portion (4a) Shaped at the end of
The second hollow rotating shaft portion formed (4b) Open end located inside (Five
a) When,Light-emitting body provided facing the rotary code plate (13)
(12) and photoreceptor (14), provided through the through hole (5)
BeThe motor shaft (twenty three) Screw holes (23a) Screw part to be screwed into
(7a) Has only on the tip side and other parts are straight non-threaded
Department (7b) Formed byMounting screw (7),The mounting screw (7) of
The mounting screw formed on the end (7) Larger than the above and
Open end (5a) Head to abut (7A) When,Mounting screw (7)of
The screw part (7a) And non-threaded part (7b) Small diameter section between (8) Set up
It consists of a ring that can be worn and expanded freely.The taper hole
Flange body located at (6)(9)Characterized by consisting of
Encoder.