JP5012502B2 - Encoder - Google Patents

Description

  The present invention relates to an encoder that is mounted on a base device and detects relative rotation between a rotating portion and a non-rotating portion of the base device.

  Conventionally, many encoders are known that are mounted on a base device such as a motor and detect relative rotation between a rotating portion and a non-rotating portion of the base device.

  For example, in the following Patent Document 1, a base member to which one of a light emitting element and a light receiving element is attached and a support member to which the other is attached are sandwiched between rotating plates having a light transmission pattern, and the base member and the support member are provided. There has been proposed an optical encoder that is configured to be connected to each other with a specific structure.

  In this encoder, the rotating plate is attached to the rotating portion of the base device, and the light transmission pattern of the rotating plate that rotates with the rotating portion is attached to the non-rotating portion of the base device while the base member and the support member are attached to the light emitting element and the light receiving device. The rotation angle is detected by detecting the element. Moreover, the permanent magnet is being fixed to the boss | hub which fixes a rotating plate, and rotation speed is detected by detecting rotation of a permanent magnet with a magnetic sensor.

  To attach this encoder to a base device, the base member to which one of the light-emitting element and light-receiving element is attached is fixed to a non-rotating part such as a casing of the base apparatus, and a boss that supports the rotating plate is attached to the rotating part. The support member to which the other of the light emitting element and the light receiving element is attached is fixed to the base member, and the respective parts are mounted with high accuracy.

The alignment is detected by, for example, a relative position between the light emitting element and the light receiving element, a relative position between the rotating plate attached to the rotating portion of the base device, the light emitting element, and the light receiving element, and the light emitting element and the light receiving element. This is performed in various relations such as a relative position between the origin of the rotation angle and the origin of the magnetic pole detected by the magnetic sensor. In this encoder, since the base member and the support member can be joined in a predetermined positional relationship, the relative position between the light emitting element and the light receiving element can be accurately positioned by fixing the support member to the base member. It is possible to match.
JP 2003-315103 A

  However, in a conventional encoder, detection units such as a light emitting element, a light receiving element, and a magnetic sensor are fixed to a base member and a support member, and are fixed to a non-rotating part such as a casing of a base device. On the other hand, a rotation code part such as a rotating plate or a permanent magnet having a detection pattern is attached to the rotating part of the base device. For this reason, there has been a problem that it is necessary to fix the detection unit and the rotary code plate while accurately positioning each other, and it takes time to mount the encoder on the base device.

  The present invention provides an encoder in which a rotation sign portion attached to a rotating portion of a base device and a detection portion fixed to a non-rotating portion of the base device can be easily aligned and mounted with high accuracy. The task is to do.

  In order to solve the above problems, the present invention has a detection code, a rotation code portion that can be attached to a rotation portion of a base device, a detection portion that can detect the detection pattern, and the detection portion is fixed. A frame that can be attached to a non-rotating portion of the base device, and capable of detecting relative rotation between the rotating portion and the non-rotating portion. The rotation code portion that can lock the rotation code portion to the frame body, and the rotation code portion that is connected to the frame body and locked by the code portion locking means so as to be in a detection position. A centering member that is slidable along a rotation axis, and the rotation sign portion locked to the frame body is coaxially connected to the rotation portion, and the centering member is connected to the frame body. It can be slid and fixed to the non-rotating part, In a state in which the centering member is fixed to the non-rotating portion, the locking with the rotation sign portion is released, and the frame body is slid with respect to the centering member to be fixed to the non-rotating portion. It is characterized by that.

  According to this invention, the code | cord | chord part latching means which latches a rotation code | cord | chord part to a frame, and it can be slid along the rotating shaft of the rotation code | symbol part connected with the frame and latched by the code | cord | chord part latching means. A centering member, so that the centering member is slid with respect to the frame body in a state where the rotation sign portion locked to the frame body is coaxially connected to the rotating portion of the base device. If fixed to the non-rotating part, the centering member can be fixed at a predetermined position with respect to the rotating part of the base device. In this state, if the lock is released from the rotation sign portion and the frame body is slid with respect to the centering member and fixed to the non-rotation portion, the frame body is brought into a predetermined position with respect to the rotation portion of the base device. Can be fixed. Therefore, it is possible to fix the frame body at a predetermined position with respect to the rotation code portion attached to the rotation portion of the base device.

  And since it can be locked by the code part locking means so that the rotation code part and the detection part are at a predetermined relative detection position, if the frame is fixed at a predetermined position with respect to the rotation code part, The sign part and the detection part can be fixed at a predetermined relative detection position. Therefore, it is possible to easily mount the rotation sign portion attached to the rotating portion of the base device and the detection portion fixed to the non-rotating portion of the base device with accurate alignment.

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

  The encoder 10 of this embodiment is an optical modular encoder, and is mounted on various base devices, and the amount of rotation such as the relative rotation angle and the relative rotation speed between the rotating portion and the non-rotating portion of the base device is determined. It is to detect. Here, an example in which the rotation amount between the motor shaft 13 and the motor housing 15 is detected by being mounted on the motor 11 will be described.

  As shown in FIGS. 1 and 2, the encoder 10 accommodates a rotation code unit 17 that can be attached to the motor shaft 13, a detection unit 40 that can detect the rotation of the rotation code unit 17, and the rotation code unit 17. The frame body 19 to which the detection unit 40 is fixed, and the centering member 20 that can be fixed to the motor housing 15 and is slidably connected to the base end portion 26 side of the frame body 19 that is the motor housing 15 side. I have.

  As shown in FIGS. 2 and 3, the rotation sign portion 17 is fixed around the boss portion 29 having an optical detection pattern and a boss portion 29 that can be connected and fixed to the motor shaft 13. The optical code plate 31 and a magnetic code body 33 having a magnetic detection pattern and fixed to the end of the boss portion 29 are provided.

  The boss portion 29 is provided with a connection hole 27 that can be coaxially connected to the motor shaft 13 along the rotation axis L of the rotation sign portion 17. The connection hole 27 can be fitted in the direction along the rotation axis L of the motor shaft 13. The connecting hole 27 can be fixed at a position where the top of the motor shaft 13 inserted from the base end portion 26 abuts the reduced diameter portion 27a.

  The side peripheral surface of the boss portion 29 has a circular cross section over its entire length, a flange-shaped code plate fixing portion 37 is provided in the vicinity of one end portion, and the optical code plate 31 is fixed in an annular shape in a direction orthogonal to the rotation axis L. Has been. In addition, a large-diameter barrel portion 29a is provided in the vicinity of the code plate fixing portion 37, and a small-diameter barrel portion 29b having a smaller diameter than the large-diameter barrel portion 29a is provided on the base end portion 26 side. Further, an annular groove 39 is provided at a predetermined portion on the base end portion 26 side of the side peripheral surface of the boss portion 29. The annular groove 39 is formed so that a later-described height locking piece 59 can be locked.

  The optical code plate 31 fixed to the code plate fixing portion 37 is provided with a predetermined optical detection pattern in an annular shape with the rotation axis L as the center. The magnetic encoder 33 fixed to the end of the boss 29 is provided with a magnetic detection pattern so that the magnetic pole changes one or more times in the circumferential direction. The origin of the detection pattern of the optical code plate 31 and the origin of the detection pattern of the magnetic encoder 33 are adjusted to coincide.

  Next, as shown in FIGS. 1 to 3, the frame body 19 includes a frame body body 23 and a support portion 25 fixed to the frame body body 23, and the housing portion 21 of the rotation encoding portion 17 is provided inside. Is provided. The accommodating portion 21 has a size capable of moving the rotation sign portion 17 in a direction along the rotation axis L by a predetermined amount.

  The frame main body 23 can be locked by fitting the boss portion 29 of the rotation sign portion 17 in a direction along the rotation axis L to prevent the movement of the rotation sign portion 17 in the direction orthogonal to the rotation axis L. A fitting hole 45 is provided. The fitting hole 45 has a circular cross section over its entire length, and a small diameter hole portion 45b that can fit the small diameter body portion 29b of the boss portion 29 is formed on the base end portion 26 side. A large-diameter large-diameter hole 45a is provided. The large-diameter trunk portion 29a of the boss portion 29 can be fitted to the end portion of the large-diameter hole portion 45a on the support portion 25 side. The large-diameter hole portion 45a and the small-diameter hole portion 45b and the large-diameter body portion 29a and the small-diameter body portion 29b can be fitted together by the relative movement of the rotation sign portion 17 along the rotation axis L toward the base end portion 26 side. In addition, the rotation sign 17 can be detached by moving relative to the support 25 along the rotation axis L.

  The frame body 23 is provided with an opening 57 for exposing a part of the boss portion 29 of the rotation sign portion 17. With this opening 57, various operations can be performed by checking the position of the rotation sign portion 17 in the accommodating portion 21 or inserting a tool from the opening 57 as necessary.

  A slide groove 61 is provided at a lower end of the opening 57 in a direction substantially orthogonal to the rotation axis L, and a detachable height locking piece 59 is slidably mounted. The height locking piece 59 is rotated by inserting and locking the tip end portion into the annular groove 39 of the boss portion 29 with the boss portion 29 of the rotation sign portion 17 fitted in the fitting hole 45. The movement of the sign portion 17 in the height direction along the rotation axis L can be prevented.

  The height locking piece 59 is provided with, for example, a concave portion and a convex portion that can be elastically locked with each other in the slide groove 61 and the height locking piece 59, and by locking these, the height locking piece 59. May be configured so as not to be easily detached from the state where the is mounted.

  On the outer peripheral surface of the frame body 23, a small-diameter outer peripheral portion 18 for connecting to the centering member 20 is provided on the base end portion 26 side. The small-diameter outer peripheral portion 18 is formed in a constant cross-sectional shape along the rotation axis L of the rotation sign portion 17.

  The support portion 25 of the frame body 19 is positioned and fixed with high accuracy at the end of the frame body 23 opposite to the base end portion 26. Here, the fitting recesses 42 are provided at a plurality of positions on the end surface of the frame body 23 and the end surface of the support portion 25, respectively, and the positioning is fixed by fitting the fitting pins 43 into the respective fitting recesses 42.

  A printed board or the like (not shown) is supported on the outer surface of the support portion 25. For example, an operation circuit of the detection unit 40, a detection signal processing circuit, and the like are provided on the printed circuit board, and various electrical components are mounted, but detailed illustration is omitted.

  Such a frame 19 is provided with a detection unit 40 for detecting an optical detection pattern provided on the optical code plate 31 and a magnetic detection pattern provided on the magnetic code body 33, respectively. It has been.

  The optical detection pattern detection unit 40 is opposed to the light emitting unit 47 provided at a predetermined position radially spaced from the fitting hole 45 of the frame body 23 and the rotation code unit 17 of the support unit 25. And a light receiving portion 53 provided at a predetermined position facing the light emitting portion 47 on the surface to be faced. The light emitting unit 47 and the light receiving unit 53 are positioned at a relative detection position that is a position in a predetermined surface direction suitable for detection with respect to the rotation axis L of the rotation code unit 17 fitted in the fitting hole 45. It is fixed.

  The light emitting unit 47 includes a divided substrate 48 fixed to the base end 26 side of the frame body 23, a light emitting element 49 that can be supplied with light by the divided substrate 48, and a light guide that guides light from the light emitting element 49. An optical hole 52 and a lens 51 that irradiates the optical code plate 31 by making light from the light emitting element 49 substantially parallel light are provided. The light receiving unit 53 is configured to receive light transmitted through the detection pattern of the optical code plate 31 and transmit the detection value to the processing circuit.

  The magnetic detection pattern detection unit 40 includes a magnetic sensor 55 provided at a position facing the boss portion 29 of the rotation code unit 17 of the support unit 25. The magnetic sensor 55 is fixed so as to be at a predetermined relative detection position suitable for detection with respect to the rotation axis L of the rotation sign portion 17 in a state of being fitted in the fitting hole 45. The magnetic sensor 55 is configured to detect a change in the magnetic pole of the magnetic encoder 33 and transmit it to a processing circuit or the like of a printed circuit board (not shown).

  Next, as shown in FIGS. 1 to 4, the centering member 20 comes into contact with the motor housing 15 and can be fixed separately from the frame body 19, and rises in a cylindrical shape from the fixed bottom 22. And a connecting sliding portion 24.

  The connecting sliding portion 24 is connected by fitting with the small-diameter outer peripheral portion 18 of the frame body 19 so as to be relatively slidable, and the frame body 19 and the centering member 20 are fitted into the fitting holes 45. It can slide along the rotation axis L of the rotation sign section 17.

  On the inner peripheral surface on the opening end side of the connecting sliding portion 24, an annular small protrusion 24f is provided in a substantially annular shape. The annular small protrusion 24f can be elastically locked to the annular small groove portion 19a provided in the small-diameter outer peripheral portion 18 of the frame body 23 with the relative position contracted by sliding the frame body 19 and the centering member 20. It has become.

  The connecting sliding portion 24 is provided with a vertical protrusion 24c at a position corresponding to the vertical groove 23a along the rotation axis L provided on the small-diameter outer peripheral portion 18 of the frame body 23, and the vertical groove 23a. Since the vertical projection 24c is disposed on the frame 19, relative rotation between the frame 19 and the centering member 20 is prevented. The vertical protrusion 24 c is provided with a fixing hole 24 d for fixing the centering member 20 to the motor housing 15 separately from the frame body 19.

  Further, the connecting sliding portion 24 is provided with a notch 24b at a position corresponding to the opening 57 of the frame body 19, and the relative position between the frame body 19 and the centering member 20 is contracted. The opening 57 is not closed and the height locking piece 59 can be attached and detached.

  The fixed bottom portion 22 of the centering member 20 is configured such that the base end portion 26 of the frame body 19 can come into contact with the inner side surface, and the frame body 19 is predetermined in the height direction by contacting the base end portion 26. It is arranged at the position. The fixing bottom portion 22 is provided with a through hole 22a through which the motor shaft 13 can pass, and a fixing hole 22e for fixing the frame body 19 and the centering member 20 to the motor housing 15 with screws. Is provided.

  Next, a method for mounting the encoder 10 having such a configuration on the motor 11 will be described.

  Before mounting, as shown in FIGS. 1 and 2, the boss portion 29 of the rotation sign portion 17 is fitted into the fitting hole 45 of the frame body 19, and the height locking piece 59 is formed in the slide groove 61. The front end is locked in the annular groove 39. Therefore, the rotation sign unit 17 is in a state where the movement in the height direction along the rotation axis L, the movement in the plane direction orthogonal to the rotation axis L, and the movement in the rotation direction around the rotation axis L are blocked. Locked to the body 19. In this state, the rotation code unit 17 and each detection unit 40 are in a predetermined relative detection position. Further, the annular small protrusion 24f and the annular small groove portion 19a of the small-diameter outer peripheral portion 18 are elastically locked in a state where the relative position between the frame body 19 and the centering member 20 is contracted.

  At the time of mounting, as shown in FIGS. 5 and 6, the centering member 20 is opposed to the motor housing 15, and the motor shaft 13 is inserted into the connection hole 27 of the boss portion 29 of the rotation sign portion 17 and connected coaxially. The top portion of the motor shaft 13 is brought into contact with the reduced diameter portion 27 a of the connection hole 27 of the rotation sign portion 17. In this state, the fixing screw 65 is inserted into the fixing hole 30 of the boss portion 29 from the through hole 25a of the support portion 25 and the through hole 33a of the magnetic encoding body 33 and screwed into the motor shaft 13, and the rotation encoding portion 17 is connected. The motor shaft 13 is fixed and attached.

  At this time, the boss portion 29 of the rotation sign portion 17 is fitted in the fitting hole 45 and the height locking piece 59 is locked in the annular groove 39. Therefore, the light emitting unit 47, the light receiving unit 53, the magnetic sensor 55, and the rotation code unit 17 provided in the frame body 19 are maintained at predetermined relative detection positions.

  Next, as shown in FIGS. 7 and 8, the annular small protrusion 24 f of the connecting sliding portion 24 of the centering member 20 is separated from the annular small groove portion 19 a of the small-diameter outer peripheral portion 18, and the centering member with respect to the frame body 19 is removed. 20 is slid to move the centering member 20 along the small-diameter outer peripheral portion 18 toward the motor housing 15, and the fixed bottom portion 22 is brought into contact with the motor housing 15. Then, the fixing screw 67 is inserted into the fixing hole 24d of the vertical projecting portion 24c of the centering member 20 from the vertical groove portion 23a of the frame body 19, and the centering member 20 is fixed to the motor housing without fixing the frame body 19. 15 is fixed. At this time, since the rotation code portion 17 is fixed to the motor shaft 13 and this rotation code portion 17 is fitted to the frame body 19, the centering member 20 is guided to the small-diameter outer peripheral portion 18 of the frame body 19. Thus, the motor shaft 13 can be fixed at a predetermined position with high accuracy.

  Thereafter, as shown in FIGS. 9 and 10, the height locking piece 59 is released, and the locking state between the height locking piece 59 and the annular groove 39 of the boss portion 29 of the rotation sign portion 17 is released. Thus, the boss 29 fitted in the fitting hole 45 can be detached. In this state, the frame body 19 is slid with respect to the centering member 20, and the frame body 19 is moved along the connecting sliding portion 24 toward the motor housing 15. At this time, the rotation sign 17 is moved relative to the frame 19 in parallel with the rotation axis L toward the support 25. Then, the large-diameter body part 29a and the small-diameter body part 29b of the boss part 29 are detached from the large-diameter hole part 45a and the small-diameter hole part 45b of the fitting hole 45, and the fitting between the boss part 29 and the fitting hole 45 is performed. The combined state is released.

  When the base end portion 26 of the frame body 19 is brought into contact with the fixed bottom portion 22 of the centering member 20, the rotation sign portion 17 is arranged at a predetermined height in the frame body 19. Specifically, the rotation code portion 17 is detached from the fitting state with the fitting hole 45 and is in a non-contact state, and the optical code plate 31 is in a height direction suitable for detection with respect to the light emitting portion 47 and the light receiving portion 53. The magnetic encoder 33 is disposed at a predetermined relative detection height that is suitable for detection with respect to the magnetic sensor 55.

  At this time, the frame body 19 is released from the locked state with the rotation sign portion 17 fixed to the motor shaft 13, but is connected to the connecting sliding portion 24 of the centering member 20, and thus the frame body 19. The relative position in the surface direction between the rotation code unit 17 and the rotation code unit 17 does not change, and each detection unit 40 fixed to the frame body 19 and the rotation code unit 17 fixed to the motor shaft 13 are maintained at a predetermined relative detection position. The

  11 and 12, fixing screws 69 are provided in fixing holes 25b, 23b, and 22e provided through the support portion 25 and the frame body 23 of the frame body 19 and the centering member 20. The frame body 19 and the centering member 20 are combined and fixed to the motor housing 15 by being inserted and screwed into the motor housing 15. As a result, the frame body 19 is attached to the motor housing 15 and the mounting of the encoder 10 can be completed.

  In the encoder 10 mounted in this way, when the motor shaft 13 is driven to rotate, the rotation code portion 17 attached to the motor shaft 13 is integrally driven and rotated, and the rotation angle at the time of rotation is determined by the optical code plate 31. The number of rotations is detected with high accuracy, and the rotation number is detected with high accuracy by the magnetic encoder 33. Each rotation amount detected by these is transmitted to a circuit of a printed circuit board (not shown) fixed to the support unit 25 and processed, and a detection signal based on this is generated and transmitted to various processing units and the like.

  According to the encoder 10 as described above, the frame body 19 includes the fitting hole 45 that fits and locks the rotation sign portion 17, and is connected to the frame body 19 and fitted into the fitting hole 45. Since the centering member 20 is slidable along the rotation axis L of the rotation code portion 17, the rotation code portion 17 locked to the frame body 19 is coaxially connected to the motor shaft 13 while being centered. If the member 20 is slid with respect to the frame body 19 and fixed to the motor housing 15, the centering member 20 can be fixed at a predetermined position with respect to the motor shaft 13. In this state, when the fitting with the rotation sign portion 17 is released and the frame body 19 is slid with respect to the centering member 20 and fixed to the motor housing 15, the frame body 19 is fixed to the motor shaft 13. Can be fixed in the position. Therefore, the frame body 19 can be accurately fixed at a predetermined position with respect to the rotation sign portion 17 attached to the motor shaft 13.

  And since the rotation code | symbol part 17 and the detection part 45 were arrange | positioned in the predetermined | prescribed relative detection position by the fitting hole 45 of the frame 19, if the frame 19 is fixed to a predetermined position with respect to the rotation code | symbol 17 The rotation code unit 17 and the detection unit 45 can be fixed at a predetermined relative detection position.

  Therefore, it is possible to easily mount the rotation sign portion 17 attached to the motor shaft 13 of the motor 11 and the detection portion 40 fixed to the motor housing 15 with high accuracy.

  Further, in the encoder 10, the rotation code portion 17 is fixed to the motor shaft 13 at a position where the reduced diameter portion 27 a of the rotation code portion 17 contacts the motor shaft 13, and the base end portion 26 of the frame body 19 is the centering member 20. By fixing the frame body 19 to the motor housing 15 at a position where it abuts the fixed bottom portion 22, the rotation sign portion 17 is arranged at a predetermined relative detection height with respect to the detection portion 40. Therefore, if the encoder 10 is mounted on the motor 11 as described above, the rotation code unit 17 can be aligned with the detection unit 40 in the height direction, and mounting is easy.

  Further, in this encoder 10, since the connecting sliding portion 24 of the centering member 20 is slidably connected to the small-diameter outer peripheral portion 18 of the frame body 19, it is provided at a position far from the rotation axis L of the rotation sign portion 17. In addition to being able to provide a larger size, it is easy to prevent misalignment when the centering member 20 and the frame 19 slide.

  Further, in this encoder 10, since the frame body 19 and the centering member 20 can be elastically locked to each other with the relative positions contracted, the frame body 19 until the encoder 10 is mounted on the motor 11. The centering member 20 and the centering member 20 can be miniaturized and handled easily.

  Further, in the encoder 10, the longitudinal protrusion 24 c is provided on the connecting sliding portion 24, and the small-diameter outer peripheral portion 18 is provided on the frame body 23 to prevent relative rotation between the frame 19 and the centering member 20. Since the fitting of the rotation sign portion 17 in the fitting hole 45 is released and the frame body 19 is fixed to the motor housing 15, the relative relationship between the rotation sign portion 17 and the frame body 19 is established. It is possible to prevent a shift due to rotation.

  In addition, the encoder 10 includes a fitting hole 45 in which the rotation code portion 17 can be fitted in a direction along the rotation axis L, and the rotation code portion 17 is disposed at a predetermined relative detection height with respect to the detection unit 40. Thus, since the fitting state of the fitting hole 45 is released, the rotation sign portion 17 can be rotated by arranging the rotation sign portion 17 at a predetermined relative detection height. Therefore, the configuration for locking and releasing the rotation sign portion 17 can be simplified, and the encoder 10 can be easily mounted.

  In particular, since the centering member 20 and the frame body 17 slide in the direction along the rotation axis L, after the centering member 20 is fixed to the motor housing 15, the frame body 17 is slid in the direction along the rotation axis L. As a result, the fitting state between the rotation sign portion 17 and the fitting hole 45 can be released and no special operation is required, so that the operation at the time of mounting can be simplified.

  Furthermore, according to the encoder 10, the rotation sign portion 17 fitted in the fitting hole 45 is provided with the height locking piece 59 that can be locked and released, and the height locking piece 59 is locked. Thus, since the movement of the rotation sign portion 17 in the direction along the rotation axis L is prevented, the rotation sign portion 17 can be reliably maintained in a state of being fitted in the fitting hole 45. Therefore, it is easy to handle before mounting, and at the time of mounting, it is easy to connect the rotation sign portion 17 and the motor shaft 13 and to fix the centering member 20 to the motor housing 15.

  Furthermore, in this embodiment, the detection unit 40 including the light emitting unit 47 and the light receiving unit 53 and the detection unit 40 including the magnetic sensor 55 are provided, but these are fixed to the same frame body 19, so If they are fixed in advance at a predetermined relative position, they can be arranged at predetermined relative detection positions suitable for detection of the rotation code unit 17, and the labor of alignment during mounting can be greatly eliminated.

  Moreover, in this embodiment, since the rotation code | cord | chord part 17 whole is accommodated in the accommodating part 21 of the frame 19, damage to the rotation code | cord | chord part 17 is easy to be prevented. Further, since the support portion 25 is fixed to the frame body 23 so as to cover the upper surface of the optical code plate 31 and the upper surface side of the housing portion 21 is closed, the adhesion of dust and the like to the surface of the optical code plate 31 is prevented. it can.

  The above embodiment can be appropriately changed within the scope of the present invention.

  For example, in the above-described embodiment, the example in which the encoder 10 is mounted on the motor 11 has been described. However, the present invention is not limited to the motor 11, and the encoder 10 can be similarly mounted on a base device having a rotating unit. Is possible.

  Moreover, although the said embodiment demonstrated the example which accommodated the small diameter outer peripheral part 18 of the frame 19 in the connection sliding part 24 as the centering member 20 so that sliding was possible, for example, a rotating shaft is set in the centering member 20 It is possible to change as appropriate, such as providing a projecting portion along L and slidably accommodating the projecting portion in the frame body 19.

  Furthermore, in the above description, the centering member 20 provided with the fixed bottom portion 22 connecting sliding portion 24 has been described. However, any member that can be slidably connected to the frame body 19 may be used. It can be used even if it does not exist and the connecting sliding portion 24 is formed in a substantially cylindrical shape.

  Moreover, in the above, in order to fix the rotation code | symbol part 17 connected with the motor shaft 13, it fixed with the fixing screw 65 along the rotating shaft L from the top part of the boss | hub part 29, However, It is not limited at all, For example, a fixing screw can be attached to the boss portion 29 in the direction orthogonal to the rotation axis L and fixed from the opening 57 side.

  Further, in the above description, the fitting hole 45 and the height locking piece 59 are provided as means for locking the rotation code portion 17 to the frame body 19, but one may be used, and the rotation code may be changed depending on other configurations. It is also possible to lock the portion 17 to the frame body 19.

  Moreover, although the said embodiment demonstrated the example in which the rotation code | cord | chord part 17 whole was accommodated in the frame 19, as long as the frame 19 can lock the rotation code | cord | chord 17 and can fix the detection part 40, it is. The rotation code unit 17 may not be accommodated in the frame body 19.

  Further, in the above, the frame body 19 is configured by fixing the support portion 25 to the frame body main body 23. However, the structure and shape of the frame body 19 can be changed as appropriate, and the detection unit can be fixed and rotated. What is necessary is just to be able to lock the sign part. For example, the frame 19 may be composed of one member or a combination of three or more members. Further, the position, size, number, and the like of the openings 57 can be changed as appropriate, and a plurality of openings 57 may be provided.

  In the above description, an example in which the optical code plate 31 and the magnetic code body 33 are provided as the rotation code unit 17 has been described. However, only one of them may be provided, and a detection pattern according to another method may be provided. It may be a thing. Further, as the detection unit 40 of the optical code plate 31, the transmission type example in which the light emitting unit 47 and the light receiving unit 53 are arranged via the optical code plate 31 has been described. However, the light emitting unit 47 and the light receiving unit 53 are on the same side. It is good also as the reflection-type detection part 40 arrange | positioned in.

It is a perspective view which shows the encoder of embodiment of this invention. It is AA sectional drawing of FIG. 1 which shows the encoder of embodiment of this invention. It is BB sectional drawing of FIG. 2 which shows the encoder of embodiment of this invention. It is a perspective view which shows the centering member of the encoder of embodiment of this invention. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is a perspective view which shows the time of attachment of a rotation code | symbol part. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is CC sectional drawing of FIG. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is a perspective view which shows the time of attachment of the centering member. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is DD sectional drawing of FIG. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is a perspective view which shows the time of detachment | leave of a height locking piece. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is EE sectional drawing of FIG. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is a perspective view which shows the time of fixation of a frame. It is a figure explaining the mounting procedure of the encoder of embodiment of this invention, and is FF sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Encoder 11 Motor 13 Motor shaft 15 Motor housing 17 Rotation code | symbol part 18 Small diameter outer peripheral part 19 Frame body 20 Centering member 22 Fixed bottom part 24 Connection sliding part 27 Connection hole 27a Diameter reduction part 29 Boss part 31 Optical code | symbol 33 Magnetic Encoder 39 Annular groove 40 Detection part 45 Fitting hole 47 Light emitting part 53 Light receiving part 55 Magnetic sensor 57 Opening part 59 Height locking piece

Claims (10)

A rotation sign having a detection pattern and attachable to the rotating part of the base device, a detecting part capable of detecting the detection pattern, and the detecting part being fixed and attachable to the non-rotating part of the base device An encoder capable of detecting relative rotation between the rotating part and the non-rotating part,
The code part locking means capable of locking the rotation code part to the frame body and the frame body so that the rotation code part and the detection part are at a predetermined relative detection position, and the code part A centering member slidable along the rotation axis of the rotation sign portion locked by the locking means,
In a state where the rotation sign portion locked to the frame body is coaxially connected to the rotation portion, the centering member can be slid with respect to the frame body and fixed to the non-rotation portion,
In a state where the centering member is fixed to the non-rotating portion, the locking with the rotation sign portion is released, and the frame body is slid with respect to the centering member to be fixed to the non-rotating portion. An encoder characterized by that. The rotation code portion has a rotation portion fixing position to which the rotation portion of the base device is fixed,
The centering member has a frame fixing position to which the frame is fixed;
The rotation unit is fixed at the rotation unit fixing position, and the frame body is fixed at the frame body fixing position, so that the rotation code unit is arranged at a predetermined relative detection height with respect to the detection unit. The encoder according to claim 1, wherein:   The encoder according to claim 1, wherein the centering member is slidably connected to an outer peripheral portion of the frame body.   The encoder according to claim 3, wherein the centering member includes a connecting sliding portion that is slidably connected to an outer peripheral portion of the frame body.   5. The encoder according to claim 4, wherein the connecting sliding portion includes a protruding protrusion that is slidably connected to an outer peripheral portion or an inner peripheral portion of the frame body. The encoder according to any one of claims 1 to 5, further comprising a contraction locking portion that can be locked in a state where the frame body and the centering member are contracted . The encoder according to any one of claims 1 to 6, further comprising a rotation locking portion that prevents relative rotation between the frame body and the centering member . The code part locking means includes a code part fitting part that is provided on the frame body and can fit the rotation code part in a direction along the rotation axis.
The fitting state of the sign part fitting part is released in a state where the rotation sign part is arranged at a predetermined relative detection height with respect to the detection part. The encoder according to one.   The code portion locking means includes a height lock piece that can be locked and released with the rotation code portion fitted in the code portion fitting portion, and the height lock piece is locked. The encoder according to claim 8, wherein movement of the rotation sign portion in a direction along the rotation axis is prevented.   The encoder according to any one of claims 1 to 9, wherein a plurality of the detection units are fixed to different positions of the frame body.

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