JP5796292B2 - Encoder installation method - Google Patents

Description

The present invention relates to a method of attaching the encoder.

For example, an encoder is known as a device that detects the rotation speed and rotation angle of a rotating body such as a rotating shaft of a motor (Patent Document 1). The encoder is used by being attached to a rotating shaft of a motor (measurement target), for example. As an example of an encoder, a rotating part on which a predetermined light reflection pattern and a magnetic pattern are formed is rotated integrally with a rotating shaft, and the reflected light is read by irradiating light to the light reflection pattern. By detecting, the rotation speed and rotation angle of the rotation shaft of the motor can be detected.
Conventionally, as a means for fixing such an encoder to a motor or the like, an inlay structure concentric with the motor shaft is provided on the motor side, and the encoder is fixed to the motor using the inlay structure.

JP 2004-20548 A

  However, when the spigot structure is provided on the motor side, there are problems that it takes time to process the motor and it is difficult to accurately configure the concentricity between the motor shaft and the spigot structure.

Aspect of the present invention is intended to provide attachment or mounting how the encoder of the mounting operation can be simplified with respect to the motor by eliminating the need for spigot structure as described above.

  An encoder according to the present invention has a rotary code plate on which a predetermined pattern is formed, a fixing hole for fixing to a rotating shaft to be measured, a disc portion that can be fixed to the rotating shaft, and the predetermined pattern A substrate unit including a detection unit for detecting the substrate, a main body unit that holds the substrate unit and fits with a part of the disk unit and accommodates the disk unit, the rotary code plate, and the detection unit Includes a holding member that integrally holds the disk portion with respect to the substrate portion while being concentric with the fixing hole.

  An encoder mounting method according to the present invention is an encoder mounting method in which the encoder according to the present invention is mounted on a rotating shaft to be measured, and the main body portion is mounted on the measuring object in a state where the rotating shaft is inserted into the fixed hole. A step of disposing the disk portion, a step of fixing the main body portion to the measurement object in a state in which a part of the disk portion is fitted to the main body portion, A step of eliminating the fitting state of the main body portion, and a step of fixing the disc portion and the rotating shaft.

  The motor device according to the present invention includes the encoder according to the present invention.

  According to the aspect of the present invention, it is possible to simplify the installation or replacement work of the encoder.

FIG. 3 is a cross-sectional view showing the overall configuration of the encoder according to the first embodiment. FIG. 3 is a cross-sectional view illustrating the overall configuration of the motor device according to the embodiment. The figure for demonstrating the attachment process of the encoder which concerns on this embodiment. The figure for demonstrating the process of removing a rotation part from the rotating shaft which concerns on this embodiment. (A) is a top view of the encoder which concerns on 2nd embodiment, (b) is the cross-sectional block diagram. Sectional drawing which shows the whole structure of the motor apparatus which concerns on 2nd embodiment. The figure for demonstrating the attachment process of the encoder which concerns on this embodiment. The attachment process explanatory drawing following FIG. FIG. 9 is an explanatory diagram of an attachment process following FIG. 8. The attachment process explanatory drawing following FIG.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
The encoder is a device that detects the number of rotations and the rotation speed of a rotating body (motor device) such as a motor. FIG. 1 is a cross-sectional view showing the overall configuration of the encoder 100 according to the first embodiment, and shows a state before being attached to a motor. As shown in FIG. 1, the encoder 100 includes a housing (main body part) 4, a detection part (board part) 30, and a rotating part (disk part) 15.

  The detection unit 30 includes a detection substrate 5 and an optical sensor (detection unit) 8. The detection substrate 5 is a plate-like member formed in a circular shape in plan view, for example. The detection unit 30 can detect the moving angle of the light reflection pattern 10 by irradiating the light reflection pattern 10 formed on the rotation unit 15 with light and the optical sensor 8 detecting the reflected light. The detection unit 30 (detection substrate 5) is attached to the housing 4.

  Further, the housing 4 and the detection unit 30 are respectively formed with through holes 41 through which fixing screws 40 (see FIG. 2) for fixing the encoder 100 and the motor body 1a are inserted. The encoder 100 can be integrally joined to the motor body 1a via a fixing screw 40 (see FIG. 2).

  The rotation unit 15 includes a rotation main body unit 31, a disk unit (rotation code plate) 9, and a convex unit 32. The disc portion 9 is formed in a disc shape provided on one end side of the rotating main body portion 31, and the light reflection pattern 10 is formed on the surface. The convex portion 32 is formed in a columnar shape provided on the other end side of the rotating main body portion 31 and is fitted to the housing 4 in a state where the rotating portion 15 is fixed to the detection substrate 5.

  The rotating portion 15 is provided with a through hole 33 at the center. One end portion of the through hole 33 constitutes a rotation shaft fixing hole 33a for fixing the rotation shaft 2 of the motor body 1a, and the other end side is for fixing the rotation portion 15 to the rotation shaft 2 of the motor body 1a. The bolt arrangement | positioning hole 33b in which the volt | bolt (refer FIG. 2) 3 of this is arrange | positioned is comprised. Further, a tap portion 33c is formed between the rotation shaft fixing hole 33a and the bolt arrangement hole 33b in the through hole 33. The tap part 33c consists of a female screw formed by the tap. Note that the inner diameter of the tap portion 33 c is configured to be larger than the outer diameter of the shaft portion 3 b of the bolt 3. That is, the shaft portion 3b of the bolt 3 is configured not to be screwed to the tap portion 33c (see FIG. 2).

  The rotating part 15 is fixed to the detection substrate 5 via bolts 42 (holding members). The detection board 5 has an opening 5a through which the bolt 42 is inserted. The bolt 42 includes a head portion 42a and a shaft portion 42b. The opening 5 a is set smaller than the head 42 a of the bolt 42. As an example, the bolt 42 is screwed into the tap portion 33 c of the rotating unit 15 to fix the rotating unit 15 to the detection substrate 5.

  The housing (main body part) 4 is formed in a cylindrical shape formed in a circular shape in plan view, and has approximately the same size as the outer diameter of the motor main body 1a. The housing 4 includes a first recess 4a, a second recess 4b, and a fitting portion 4c, and accommodates the rotating portion 15 in the internal space. The first concave portion 4 a constitutes a space for accommodating the rotating portion 15 (the rotating main body portion 31 and the disc portion 9) with the detection substrate 5. The second concave portion 4b is for forming a space for accommodating the convex portion 32 of the rotating portion 15 with the motor body 1a when the rotating portion 15 is fixed to the rotating shaft 2 (FIG. 2).

  In the encoder 100 according to the present embodiment, the rotating portion 15 and the detection substrate 5 are integrated by the bolt 42 in a state where the disc portion 9 and the detecting portion 30 are concentric with the rotating shaft fixing hole 33a (concentric state). It is assembled in a state that is held in.

Here, a method of assembling the encoder 100 with the disc part 9 and the detection part 30 being concentric will be described.
The rotating part 15 is machined in a state of being concentric with a reference shaft having the same outer diameter as the rotating shaft 2 of the motor to which the encoder 100 is attached. Further, the rotating part 15 is processed so that the outer diameter of the convex part 32 and the through hole 33 (or the rotating shaft fixing hole 33a) are coaxial with the reference axis. Further, the light reflection pattern 10 of the disc portion 9 is also formed in a state in which it is concentric with the rotation shaft fixing hole 33a that has been coaxially processed with the reference shaft by the decentering operation.

  The fitting portion 4 c forms a circular opening for fitting the convex portion 32 in the rotating portion 15. Further, the opening is configured so that the fitting portion 4 c is concentric with the rotating portion 15 fitted to the convex portion 32. As described above, since the rotating portion 15 has the outer diameter of the convex portion 32 and the rotation shaft fixing hole 33a concentric (concentric), the casing 4 (fitting portion) concentric with the rotating portion 15 is taken. 4c) is in a state of being concentric with the rotation shaft fixing hole 33a.

  As for the detection part 30, the detection board | substrate 5 and the rotation part 15 are being fixed via the volt | bolt 42 (holding member). The detection unit 30 is in a state where the optical sensor 8 is concentric with the fitting unit 4c. That is, the optical sensor 8 is disposed on the detection substrate 5 so as to satisfy the concentric state. The opening 5a is concentric with the rotation shaft fixing hole 33a. As described above, since the fitting portion 4c is processed in a state of being concentric with the rotation shaft fixing hole 33a, the detection unit 30 concentric with the fitting portion 4c is connected to the rotation shaft fixing hole 33a. But the concentricity is taken.

  The rotating part 15 is such that the bolt 42 inserted through the opening 5a and the through hole 33 of the detection substrate 5 is screwed into the tap part 33c in a state where the convex part 32 is fitted into the fitting part 4c of the housing 4. And is fixed to the detection substrate 5. The bolt 42 is screwed into the tap portion 33c so that the tip portion protrudes into the rotation shaft fixing hole 33a.

  As described above, in the encoder 100 according to the present embodiment, the rotating unit 15 and the detection substrate 5 are integrally formed by the bolt 42 in a state where the disc portion 9 and the detecting unit 30 are concentric with the rotating shaft fixing hole 33a. It is assembled in a state that is held in.

FIG. 2 is a cross-sectional view showing the overall configuration of the motor device 1 in which the encoder 100 is attached to the rotating shaft 2 of the motor device 1.
As shown in FIG. 2, in the encoder 100, the housing 4 is fixed to the motor body 1 a via a fixing screw 40. The motor main body 1a is formed with a female screw portion 1A for attaching a fixing screw 40 to the upper end portion on the rotating shaft 2 side. 1a is integrally held.

  In the motor device 1, the rotating portion 15 is fixed to the rotating shaft 2 by a bolt 3 and rotates integrally with the rotating shaft 2. The bolt 3 includes a head portion 3 a and a shaft portion 3 b, and a screw portion 3 bb formed on the shaft portion 3 b is screwed with a female screw 2 a formed on the rotating shaft 2, thereby fixing the rotating portion 15 to the rotating shaft 2. doing.

  The rotating unit 15 holds the light reflecting pattern 10 facing the optical sensor 8 of the detecting unit 30 at a predetermined distance. In a state where the rotating part 15 is fixed to the rotating shaft 2, the disk surface 9 a is perpendicular to the rotating shaft 2, and the rotating shaft R direction of the rotating part 15 is the same direction as the extending direction of the rotating shaft 2. . The rotating unit 15 is accommodated so as not to contact the housing 4 in a state of being fixed to the rotating shaft 2.

Here, the operation of the encoder 100 attached to the motor device 1 will be described.
When the rotating shaft 2 rotates, the rotating unit 15 and the light reflection pattern 10 attached integrally to the rotating shaft 2 rotate integrally with the rotating shaft 2. About the detection part 30, since it is not connected to the rotating shaft 2, it will be in a stationary state without rotating.

  When the rotation unit 15 rotates, the light reflection pattern 10 formed on the rotation unit 15 moves in the rotation direction. The above-mentioned optical sensor 8 reads the reflected light via the light reflecting pattern 10 out of the light emitted from the light source, and thereby the rotation information (for example, the rotation angle) of the rotating shaft 2 based on the moving angle of the light reflecting pattern 10 and the like. And the number of rotations) can be detected.

  In this way, the encoder 100 can detect the rotation information of the rotary shaft 2. In the motor device 1 according to this embodiment, since the encoder 100 is attached, the rotary shaft 2, the disk portion 9, and the detection unit 30 are accurately positioned. The rotation control can be performed with high accuracy.

Next, a procedure for attaching the encoder 100 shown in FIG. 1 to the motor apparatus 1 having the configuration shown in FIG. 3 will be described.
First, as shown in FIG. 3A, the encoder 100 is disposed on the motor body 1a while the rotary shaft 2 is inserted into the rotary shaft fixing hole 33a. The encoder 100 according to this embodiment is assembled in a state in which the disc portion 9 and the detection portion 30 are concentric with the rotation shaft fixing hole 33a, and thus the rotation shaft 2 inserted into the rotation shaft fixing hole 33a. Is positioned with respect to the disk portion 9 and the detection portion 30. The rotary shaft 2 is inserted partway through the rotary shaft fixing hole 33a. While the bolt 42 is screwed into the tap portion 33 c, the tip portion protrudes into the rotation shaft fixing hole 33 a, but the tip portion may be in contact with the rotation shaft 2.

  In the encoder 100 according to the present embodiment, since the disc portion 9 and the detection portion 30 are concentric with the rotation shaft fixing hole 33a, the rotation shaft 2 inserted into the rotation shaft fixing hole 33a. Are arranged concentrically (concentrically) with respect to the disc portion 9 and the detecting portion 30.

  Subsequently, as shown in FIG. 3B, the fixing screw 40 is inserted into the through hole 41 in a state where the convex portion 32 of the rotating portion 15 is fitted to the fitting portion 4 c of the housing 4. The housing 4 and the motor main body 1a are fixed using.

Subsequently, as illustrated in FIG. 3C, the bolt 42 that fixes the detection substrate 5 and the rotating unit 15 is removed. Thereby, the fitting state of the rotation part 15 and the housing | casing 4 will be eliminated.
As an example, as the bolt 42 is removed from the tap portion 33c, the rotating portion 15 moves downward and the rotating shaft 2 is completely inserted into the rotating shaft fixing hole 33a. Moreover, the convex part 32 will be in the state which remove | deviated from the fitting part 4c as the rotation part 15 moves below.

  Subsequently, as shown in FIG. 3 (d), the rotating portion 15 is fixed to the rotating shaft 2 with the bolt 3. In addition, since the outer diameter of the head 3a is smaller than the inner diameter of the opening 5a formed in the detection substrate 5, the bolt 3 is inserted through the opening 5a and is surely arranged in the bolt arrangement hole 33b. . Therefore, the bolt 3 can reliably fix the rotating portion 15 and the rotating shaft 2 by the shaft portion 3 b being screwed into the female screw 2 a of the rotating shaft 2.

  As described above, according to the encoder mounting method according to the present embodiment, since the disk portion 9 and the detection portion 30 incorporate the encoder 100 that is concentric with the rotation shaft fixing hole 33a, the spigot structure is used in the motor body. Without being provided in 1a, the rotating shaft 2 is inserted into the rotating shaft fixing hole 33a and then fixed, whereby the motor device 1 in which the rotating shaft 2, the disk portion 9, and the detecting portion 30 are accurately positioned can be easily obtained. Can be assembled.

  According to the motor device 1, since the rotary shaft 2, the disc portion 9, and the detecting portion 30 are positioned with high accuracy, the rotation control of the rotary shaft 2 can be performed with high accuracy, and the reliability is high. It will be expensive.

  In addition, the said bolt 42 which has fixed the rotation part 15 and the detection board | substrate 5 can be used as an extraction screw at the time of taking out the rotation part 15 from the rotating shaft 2. FIG. As an example, when the rotating portion 15 is taken out from the rotating shaft 2, the bolt 3 is first removed from the rotating shaft 2. Thereafter, the bolt 42 is inserted into the opening 5a of the detection substrate 5, and the bolt 42 is screwed into the tap portion 33c.

  As shown in FIG. 4, when the bolt 42 enters the tap portion 33c, the tip of the bolt 42 projects into the rotation shaft fixing hole 33a. In FIG. 4, the detection substrate 5 is not shown. By screwing the bolt 42 into the tap portion 33c in this way, the tip end portion of the bolt 42 can be protruded into the rotation shaft fixing hole 33a. Thereby, the rotating shaft 2 can be pulled out from the rotating shaft fixing hole 33a of the rotating portion 15. In addition, illustration of the detection board | substrate 5 is abbreviate | omitted in FIG.

  After pulling out the rotating part 15 from the rotating shaft 2, the encoder 100 can be removed from the motor body 1a by removing the fixing screw 40 that fixes the housing 4 and the motor body 1a.

  As described above, according to the encoder 100 according to the present embodiment, it is possible to easily perform attachment or detachment work with respect to the motor main body 1 a including the step of detaching the rotating portion 15 from the rotating shaft 2. Therefore, the encoder 100 has excellent detachability with respect to the motor body 1a.

(Second embodiment)
Next, a configuration according to the second embodiment of the present invention will be described. Note that the difference between this embodiment and the first embodiment is that the detection board and the rotating part of the encoder are fixed by a plurality of holding members, and that the holding member is used as a means for fixing the encoder and the motor body. That is, the other configurations are the same. Therefore, in the following description, the description of the same members and configurations as those in the first embodiment will be omitted or simplified.

FIG. 5 is a diagram showing an overall configuration of the encoder according to the present embodiment, FIG. 5 (a) is a plan view of the encoder, and FIG. 5 (b) is a sectional configuration diagram of the encoder.
The encoder 200 has the housing | casing 4, the detection part 30, and the rotation part 15, like the structure which concerns on 1st embodiment, as shown to Fig.5 (a), (b). The housing 4 is formed with a fixing portion 143 provided with a through hole 141 for inserting a bolt (holding member) 142 (see FIG. 6) for fixing the encoder 200 and the motor body 1a. The fixing portion 143 has a bowl shape surrounding the casing 4. Thus, the encoder 200 can be integrally joined to the motor body 1a by being fixed to the motor body 1a via the bolt 142 (see FIG. 6).

  The rotating portion 15 is provided with a through hole 33 at the center. One end of the through hole 33 constitutes a rotating shaft fixing hole 33a for fixing the rotating shaft 2, and the other end is a bolt on which a bolt 3 for fixing the rotating portion 15 to the rotating shaft 2 is arranged. The arrangement hole 33b is configured. In the present embodiment, the tap portion is not provided between the rotation shaft fixing hole 33a and the bolt arrangement hole 33b in the through hole 33.

  In the detection unit 30, the detection substrate 5 and the rotation unit 15 are fixed via a plurality of (four in this embodiment) bolts 142 (holding members). The detection substrate 5 is formed with an opening 5a that allows the through hole 33 to face the inside. The opening 5a is concentric with the rotation shaft fixing hole 33a. An opening 5b through which the bolt 142 is inserted is formed so as to surround the outer periphery of the opening 5a. The opening 5b is also concentric with the rotation shaft fixing hole 33a.

  The rotating part 15 is configured such that a plurality of bolts 142 are screwed into screw holes (female screws) provided in the rotating part 15 in a state where the convex part 32 is fitted to the fitting part 4c of the housing 4. 5 is fixed.

  Also in the present embodiment, the detection unit 30 is in a state in which the optical sensor 8 is concentric with the fitting unit 4c. That is, the optical sensor 8 is disposed on the detection substrate 5 so as to satisfy the concentric state. The detection substrate 5 is fixed to the housing 4 via screws 150. Also in this embodiment, since the fitting part 4c is processed in a state where it is concentric with the rotating shaft fixing hole 33a, the detecting part 30 concentric with the fitting part 4c is the rotating shaft fixing hole 33a. Concentricity is also taken.

  As described above, in the encoder 200 according to the present embodiment, the rotating unit 15 and the detection substrate 5 are integrated by the bolt 142 in a state where the disc portion 9 and the detecting unit 30 are concentric with the rotating shaft fixing hole 33a. It is assembled in a state that is held in.

  FIG. 6 is a diagram illustrating an overall configuration of a motor device 1 ′ in which an encoder 200 is attached to the rotating shaft 2 of the motor device 1, in which a top view shows a planar configuration of the motor device, and a bottom view shows the motor device. The cross-sectional structure is shown. As shown in FIG. 6, in the encoder 200, the housing 4 is fixed to the motor body 1 a via a plurality of bolts 142 that have fixed the rotating unit 15 and the detection substrate 5.

  The motor main body 1a is formed with a female screw portion 1A for attaching a bolt 142 to the upper end portion on the rotating shaft 2 side, and the bolt 142 is screwed into the female screw portion 1A so that the housing 4 and the motor main body 1a are connected. Are held together.

  In the motor device 1 ′, the rotating portion 15 is fixed to the rotating shaft 2 by the bolt 3, and rotates integrally with the rotating shaft 2. In the bolt 3, a screw portion formed on the shaft portion 3 b is screwed into a female screw 2 a formed on the rotating shaft 2.

Next, a procedure for attaching the encoder 200 shown in FIG. 5 to the motor apparatus 1 ′ having the configuration shown in FIG. 6 will be described with reference to FIGS. In addition, the top view in each figure shows the planar configuration of the motor device, and the bottom view shows the cross-sectional configuration of the motor device.
First, as shown in FIG. 7, the encoder 200 is disposed on the motor body 1a while the rotary shaft 2 is inserted into the rotary shaft fixing hole 33a. At this time, since the encoder 200 is in a state where the disc portion 9 and the detection portion 30 are concentric with the rotation shaft fixing hole 33a, the rotation shaft 2 inserted into the rotation shaft fixing hole 33a is a disc. Positioned relative to the unit 9 and the detection unit 30. At this time, the rotating shaft 2 is inserted into the rotating shaft fixing hole 33a halfway.

  Subsequently, the housing 4 is fixed to the motor main body 1 a in a state where the convex portion 32 of the rotating portion 15 is fitted to the fitting portion 4 c of the housing 4. In the present embodiment, as shown in FIG. 8, out of the four bolts 142 that fix the rotating unit 15 and the detection substrate 5, two diagonally arranged bolts are removed, and the removed bolts 142 are installed in the housing. The through hole 141 provided in the fixing portion 143 of the body 4 is inserted, and the casing 4 is fixed to the motor main body 1 a using the bolt 142. At this time, since the rotating portion 15 is fixed to the detection substrate 5 with two bolts, the convex portion 32 remains in a state of being fitted to the fitting portion 4 c of the housing 4.

  Then, as shown in FIG. 9, the remaining two bolts 142 are removed, and the housing 4 is fixed to the motor body 1 a using the removed bolts 142. When the two bolts 142 are removed, the rotating portion 15 moves downward, so that the rotating shaft 2 is completely inserted into the rotating shaft fixing hole 33a. Further, as the rotating portion 15 moves downward, the convex portion 32 comes out of the fitting portion 4c.

  As described above, in the present embodiment, the housing 4 and the motor main body 1a are sequentially fixed using the removed bolt 142, the step of fixing the housing 4 and the motor main body 1a, and the bolt 142 is removed. Thus, the step of eliminating the fitting state of the rotating portion 15 and the housing 4 can be performed simultaneously (synchronized).

  Subsequently, as shown in FIG. 10, the rotating portion 15 is fixed to the rotating shaft 2 by the bolt 3. The bolt 3 can reliably fix the rotating portion 15 and the rotating shaft 2 by the shaft portion 3 b being screwed into the female screw 2 a of the rotating shaft 2.

  As described above, according to the encoder mounting method according to the present embodiment, the disc portion 9 and the detection portion 30 incorporate the encoder 200 having the concentricity with the rotation shaft fixing hole 33a. Without being provided in 1a, the rotating shaft 2 is inserted into the rotating shaft fixing hole 33a and then fixed, so that the rotating shaft 2, the disk portion 9, and the detecting portion 30 can be easily positioned with high accuracy. Can be assembled into. Moreover, since the bolt 142 which fixes the rotation part 15 and the detection board | substrate 5 can be reused as a means to fix the housing | casing 4 and the motor main body 1a, the screw etc. which fix the housing | casing 4 and the motor main body 1a are used. The need to prepare separately can be eliminated. Therefore, according to the encoder or the attachment method of the encoder according to the present embodiment, the motor device can be assembled at a low cost in a short time.

  The present invention is not limited to the configuration according to the above-described embodiment, and can be appropriately changed without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1, 1 '... Motor apparatus, 2 ... Rotating shaft, 3 ... Bolt (fixing screw), 5 ... Detection board (board | substrate part), 8 ... Optical sensor (detection part), 9 ... Disc part (rotation code | symbol plate), DESCRIPTION OF SYMBOLS 15 ... Rotation part (disk part), 30 ... Detection part (board | substrate part), 31 ... Main body part, 33a ... Rotation shaft fixing hole (fixing hole), 33b ... Bolt arrangement hole (mounting hole), 33c ... Tap part, 42: Bolt (holding member), 100, 200: Encoder

Claims (2)

While holding the said board | substrate part, the disk part which has the rotation code | symbol plate in which the predetermined pattern was formed, the fixing hole and the attachment hole, the board | substrate part containing the detection part which detects the said predetermined pattern, A main body portion that fits into a part of the disc portion and accommodates the disc portion, and the disc portion is concentric with the rotation code plate and the detection portion with respect to the fixing hole. In the state, the holding member is attached to the attachment hole through the substrate portion, and the encoder is integrally attached to the substrate portion and attached to the rotation shaft to be measured,
Placing the main body on the measurement object while inserting the rotating shaft into the fixed hole;
Fixing the main body part to the measurement object in a state in which a part of the disc part is fitted to the main body part;
Removing the holding member to eliminate the fitting state of the disk portion and the main body portion; and
Fixing the disk part and the rotating shaft, and making the disk part rotatable with the rotating shaft;
A method of attaching an encoder, comprising: The said main-body part and the said measuring object are sequentially fixed using the removed said holding member in the case where the said disk part is hold | maintained at the said board | substrate part via the said several holding member. A method for attaching the encoder according to 1 .

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