JP2008245385A - Resolver fixing structure, sewing machine equipped with the resolver fixing structure - Google Patents

Abstract

The present invention provides a resolver fixing structure capable of preventing an adhesive from protruding or sagging when a stator or a rotor is fixed to a holder with an adhesive, and a sewing machine equipped with the resolver fixing structure.
A resolver for detecting a rotation angle of a rotation shaft of a sewing machine motor is provided in the sewing machine. The resolver includes a resolver rotor and a resolver stator. The resolver stator is fixed to the mounting recess 51 of the stator holder 50 with an adhesive. A plurality of collecting grooves 55 are provided on the inner peripheral surface 51 b of the mounting recess 51. Further, one guide groove 56 is provided around the inner peripheral surface 51b. Six retaining grooves 55 communicate with the guide groove 56, respectively. Since the excess grooves of the adhesive applied to the inner peripheral surface 51b can be released by the pool grooves 55 and the guide grooves 56, it is possible to prevent the adhesive from protruding and sagging. Therefore, the resolver can be fixed with high accuracy.
[Selection] Figure 4

Description

  The present invention relates to a resolver fixing structure and a sewing machine equipped with the resolver fixing structure, and more particularly to a resolver fixing structure capable of detecting a rotation angle of a rotating shaft of a motor and a sewing machine equipped with the resolver fixing structure. .

  Conventionally, a sewing machine is provided with a sewing machine motor that rotationally drives a main shaft for driving a needle bar. The sewing machine motor is often provided with an optical encoder as a sensor for detecting the position of the needle bar. The encoder is an optical sensor composed of a light emitting element, a slit disk, a light receiving element, and an IC circuit. A digital signal of a position can be obtained by generating a pulse at a certain angle and counting the pulse. . The encoder has advantages in terms of accuracy and ease of use, but has an IC circuit, and therefore has a demerit that it is weak in environmental resistance such as oil resistance, impact resistance, vibration resistance, temperature, humidity, and dust.

Thus, it is conceivable to replace this encoder with a resolver that performs position detection with an analog signal. The resolver is composed of a rotor and a stator, and outputs a two-phase 90 ° signal whose amplitude changes sinusoidally with respect to the rotation angle. By taking the arc tangent of the output signal, the resolver It is a sensor which guides the rotation angle. Since such a resolver has a simple structure and is strong, there is an advantage that it is stronger in oil resistance, impact resistance, vibration resistance, and environmental resistance than an encoder. On the other hand, however, the signal output from the resolver is greatly influenced by the mounting accuracy of the resolver, and there is a demerit that the accuracy is greatly deteriorated particularly when excessive stress or deformation is applied during assembly. For this reason, for fixing, an assembling method and a structure that do not cause the above-described influence are necessary. As a method for assembling so that excessive stress is not applied, for example, there is a method in which a stator of a resolver is bonded to a case (holder) of a brushless motor with an adhesive (see, for example, the conventional technique of Patent Document 1).
JP 2003-23761 A

  However, unless the adhesive is evenly applied to the case (holder), the excess adhesive protrudes from the case, and there is a problem that the stator cannot be fixed with high accuracy.

  The present invention has been made in order to solve the above-mentioned problems, and when fixing the stator to the holder with an adhesive, the resolver fixing structure capable of preventing the adhesive from protruding or sagging, and fixing the resolver It is an object to provide a sewing machine having a structure.

  To achieve the above object, the resolver fixing structure of the invention according to claim 1 includes an annular rotor attached to the rotating shaft of the motor, and an annular stator that coaxially inserts the rotor. The stator holder for supporting the stator is a resolver fixing structure fixed to the motor, and the stator holder is provided with a circular recess for housing the stator and attaching it with an adhesive. Between the inner peripheral surface of the stator and the outer peripheral surface of the stator, there is provided a reservoir portion for releasing excess of the adhesive.

  According to a second aspect of the present invention, there is provided the resolver fixing structure according to the first aspect, wherein the reservoir is a reservoir provided on an inner peripheral surface of the recess or an outer peripheral surface of the stator. It is a groove.

  According to a third aspect of the present invention, there is provided a resolver fixing structure according to the second aspect of the present invention. In addition to the structure of the second aspect of the invention, a plurality of the accumulation grooves are provided on the inner peripheral surface of the concave portion, and A guide groove is provided that extends along the outer periphery of the bottom portion of the recess that contacts the stator and communicates with the pool groove.

  According to a fourth aspect of the present invention, there is provided a resolver fixing structure comprising: an annular rotor attached to a rotating shaft of a motor; and an annular stator for coaxially inserting the rotor; A resolver fixing structure in which a cylindrical rotor holder to be held is fixed to the rotating shaft, the rotor being externally fixed to the rotor holder by an adhesive, and an outer peripheral surface of the rotor holder and an inner peripheral surface of the rotor Between the two, there is provided a reservoir for releasing the excess of the adhesive.

  According to a fifth aspect of the present invention, there is provided the resolver fixing structure according to the fourth aspect, wherein the reservoir is a reservoir provided on an outer peripheral surface of the recess or an inner peripheral surface of the rotor. It is a groove.

  A sewing machine according to a sixth aspect of the invention comprises the resolver fixing structure according to any one of the first to fifth aspects, wherein the rotational angle of a sewing machine motor for rotationally driving a main shaft for driving the needle bar is detected. It is characterized by having.

  In the resolver fixing structure according to the first aspect of the present invention, the annular stator is housed in the recess of the stator holder fixed to the motor and attached with an adhesive. And since the reservoir part for releasing the excess part of an adhesive agent is provided between the inner peripheral surface of the recess and the outer peripheral surface of the stator, it is possible to prevent the adhesive from protruding or sagging. .

  In the resolver fixing structure of the invention according to claim 2, in addition to the effect of the invention according to claim 1, the reservoir is a reservoir groove provided on the inner peripheral surface of the recess or the outer peripheral surface of the stator. Therefore, the surplus adhesive can be released to the pool groove.

  In addition, in the resolver fixing structure of the invention according to claim 3, in addition to the effect of the invention of claim 2, a plurality of reservoir grooves are provided on the inner peripheral surface of the recess, so that a large amount of excess adhesive is present. However, it can escape to the accumulation groove. Furthermore, these pool grooves extend in the height direction of the recess and communicate with a guide groove provided along the outer periphery of the bottom portion with which the stator of the recess contacts. As a result, when the stator is attached to the concave portion of the stator holder with an adhesive, even if the excess adhesive cannot be directly discharged into the groove depending on the position where the adhesive is applied, the guide groove is inserted. Can escape into the accumulation groove.

  In the resolver fixing structure according to the fourth aspect of the present invention, the annular rotor is externally fixed to the rotor holder fixed to the rotating shaft of the motor and fixed with an adhesive. And since the reservoir part for letting off the surplus part of the adhesive agent is provided between the outer peripheral surface of the rotor holder and the inner peripheral surface of the rotor, it is possible to prevent the adhesive from protruding or sagging. .

  In the resolver fixing structure of the invention according to claim 5, in addition to the effect of the invention according to claim 4, the reservoir is a reservoir groove provided on the outer peripheral surface of the recess or the inner peripheral surface of the rotor. Therefore, the surplus adhesive can be released to the pool groove.

  The sewing machine of the invention according to claim 6 is provided with the resolver fixing structure according to any one of claims 1 to 5 for detecting the rotation angle of the sewing machine motor, so that the adhesive protrudes from the stator holder or the rotor holder. Sagging can be prevented.

  Hereinafter, a sewing machine 1 which is an embodiment of the present invention will be described with reference to the drawings. The sewing machine 1 includes a resolver 17 that detects a rotation angle of a rotation shaft 77 of the sewing machine motor 60, and a fixing structure that fixes the resolver 17 to the sewing machine motor 60.

  1 is an overall perspective view of the sewing machine 1, FIG. 2 is a cross-sectional view showing a fixing structure of the resolver 17 with respect to the sewing machine motor 60, and FIG. 3 shows a manual pulley 8, a rotor holder 20, a resolver 17, and a stator holder 50. FIG. 4 is an exploded perspective view showing the mutual positional relationship of the sewing machine motor 60, FIG. 4 is a perspective view of the stator holder 50, and FIG. 5 is a cross-sectional view in the direction of the arrows AA shown in FIG. 6 is an enlarged view of a portion W surrounded by a two-dot chain line shown in FIG. 5, and FIG. 7 is a perspective view of the rotor holder 20. The right side shown in FIG. 1 is the right side of the sewing machine 1, the left side is the left side of the sewing machine 1, the front side of the paper is the front side of the sewing machine 1, and the depth side of the paper is the back side of the sewing machine 1. Further, these drawings are used for explaining the technical features that can be adopted by the present invention, and the configuration of the apparatus described is limited to only that unless otherwise specified. It is not an intention to do so, but merely an illustrative example.

  First, a schematic configuration of the sewing machine 1 will be described. As shown in FIG. 1, the sewing machine 1 has a bed portion 2, a pedestal column portion 3 erected in a vertical direction from the right end portion of the bed portion 2, and the bed portion 2 from the upper end of the pedestal column portion 3. Thus, the arm portion 4 extending to the left is mainly configured. The bed portion 2 accommodates a feed dog vertical movement mechanism (not shown) that moves the feed dog up and down, a feed dog forward and backward movement mechanism (not shown) that moves back and forth, a lower thread bobbin, and a thread ring that cooperates with the sewing needle 6. A catcher (for example, a horizontal hook), a thread trimming mechanism, and the like are provided. The arm portion 4 includes a sewing machine motor 60, a sewing machine spindle 7 that is driven to rotate by the sewing machine motor 60, a manual pulley 8 that can be rotated manually by an operator, and a sewing machine motor 60. A resolver 17 (see FIGS. 2 and 3) that detects the rotation angle of the rotary shaft 77 of the sewing machine motor 60, a needle bar drive mechanism that moves the needle bar 5 with the sewing needle 6 attached to the lower end thereof, and a needle A needle bar swinging mechanism (not shown) that swings the bar 5 in a direction orthogonal to the cloth feed direction, a balance driving mechanism (not shown) that moves the balance up and down by adjusting the vertical movement of the needle bar 5, and the like. Is provided.

  The feed dog vertical movement mechanism and needle bar vertical movement mechanism are driven by a sewing machine spindle 7 rotated by a sewing machine motor 60. The needle bar swinging mechanism is independently driven by a needle bar swinging stepping motor (not shown), and the feed dog longitudinal movement mechanism is independently driven by a feed dog forward / backward driving stepping motor (not shown).

  Next, the sewing machine motor 60 will be described. The sewing machine motor 60 shown in FIGS. 1 to 3 is, for example, a brushless motor (three-phase motor) using two poles and three coils. As shown in FIG. 2, the sewing machine motor 60 includes a substantially cylindrical case 61. The case 61 is composed of a substantially bottomed cylindrical case body 62 and a circular end plate 63 as a top plate of the case body 62 when viewed from the front. A shaft hole 70 is provided at the center of the bottom 64 of the case body 62, and a bearing 75 is disposed around the shaft hole 70. On the other hand, a shaft hole 69 (see FIG. 3) is also provided at the center of the end plate 63, and a bearing 76 is disposed around the shaft hole 69. And the rotating shaft 77 is rotatably supported inside the case 61 by these bearings 75 and 76.

  Further, one end portion of the sewing machine main shaft 7 is connected to one end portion extending toward the arm portion 4 (see FIG. 1) of the rotating shaft 77. Thereby, the rotational drive of the rotary shaft 77 is transmitted to the sewing machine main shaft 7, and various mechanisms such as a feed dog vertical movement mechanism and a needle bar vertical movement mechanism are driven. In addition, a rotor holder 20 described later is fixed by being attached to the other end portion extending toward the right side of the pillar portion 3 (see FIGS. 1 and 2) of the rotating shaft 77. And the manual pulley 8 is fixed to the flange part 22 (refer FIG. 7) mentioned later of the rotor holder 20 with the screw | thread 81 through the opening 3a (refer FIG. 2) provided in the upper part of the right side surface of the pedestal part 3. FIG. Has been. Therefore, since the sewing machine main shaft 7 can be rotated by manually rotating the manual pulley 8, the feed dog vertical movement mechanism and the needle bar vertical movement mechanism can be manually moved.

  As shown in FIGS. 1 and 2, a substantially cylindrical protective cover 15 is provided around the opening 3 a of the pedestal 3, and the fixed side of the manual pulley 8 is covered by the protective cover 15. Protected. In addition, a tool insertion hole 78 provided along the axis of the rotation shaft 77 and for inserting and fixing a tool (not shown) is provided at the other end of the rotation shaft 77 extending toward the opening 3a.

  Incidentally, a cylindrical drive stator 71 is fixed to the inner peripheral surface of the case main body 62. Inside the drive stator 71, a cylindrical drive rotor 72 attached to the rotary shaft 77 by being extrapolated is inserted. Further, the drive stator 71 includes a drive coil for generating a magnetic force for driving the drive rotor 72. The drive stator 71 is connected to a wiring 91 connected to a control device (not shown). As a result, the drive rotor 72 rotates inside the drive stator 71, so that the rotation shaft 77 rotates and the sewing machine main shaft 7 rotates as the drive rotor 72 rotates.

  Further, as shown in FIG. 3, a ring-shaped protrusion 65 is provided on the outer surface of the end plate 63 so as to protrude along the inner edge of the shaft hole 69. Further, a ring-shaped protrusion 68 is provided around the protrusion 65 so as to surround and protrude from a position away from the protrusion 65. A holder mounting recess 67 for fitting and fixing a bottom portion of a stator holder 50 to be described later is formed inside the protrusions 65 and 68. Further, three attachment holes 66 are provided at the ring-shaped bottom of the holder attachment recess 67 so as to surround the periphery of the shaft hole 69. These mounting holes 66 are screw holes into which screws 82 (see FIG. 2) for fixing the stator holder 50 are inserted. The attachment holes 66 are provided at positions respectively opposed to three attachment holes 57 described later provided on the outer periphery of the stator holder 50.

  Next, the resolver 17 will be described. The resolver 17 shown in FIGS. 2 and 3 is a known sensor that detects the rotation angle of the rotation shaft 77 of the sewing machine motor 60. The resolver 17 is attached to the other end portion on the end plate 63 side of the rotary shaft 77 shown in FIG. 2, and a ring-shaped resolver rotor 30 that functions as a rotor, and a sewing machine motor 60 in a state where the resolver rotor 30 is inserted. The ring-shaped resolver stator 40 is supported on the end plate 63 and functions as a stator. The resolver 17 having such a structure outputs a two-phase 90 ° shifted signal whose amplitude changes sinusoidally with respect to the rotation angle. By taking the arc tangent of the output signal, the rotation of the sewing machine motor 60 is performed. The rotation angle of the shaft 77 can be calculated.

  Next, the resolver rotor 30 will be described. The resolver rotor 30 shown in FIG. 3 is formed in a ring shape, and has a structure in which a plurality of sheets formed of electromagnetic steel plates are laminated. The resolver rotor 30 is externally attached to the cylindrical portion 21 (see FIGS. 3 and 7) of the rotor holder 20 and fixed with an adhesive. Then, the rotor holder 20 to which the resolver rotor 30 is fixed is extrapolated to the rotating shaft 77 of the sewing machine motor 60 and fixed. Thereby, the resolver rotor 30 can be rotated integrally with the rotating shaft 77.

  Next, the resolver stator 40 will be described. A resolver stator 40 shown in FIG. 3 is formed in a ring shape having a diameter larger than that of the resolver rotor 30 and has a structure in which a plurality of sheets formed of electromagnetic steel plates are laminated. Such a resolver stator 40 includes an annular portion 41 and a plurality of salient poles 43 that protrude toward the inside of the annular portion 41. A coil 44 is formed by winding a winding around each salient pole 43. In addition, a terminal portion 46 including a plurality of terminals 47 is provided at a predetermined portion of the annular portion 41. A wiring 92 (see FIG. 2) connected to a control device (not shown) is connected to the terminal portion 46. The resolver stator 40 is fixed to an attachment recess 51 (see FIG. 4), which will be described later, of the stator holder 50 with an adhesive. The stator holder 50 to which the resolver stator 40 is fixed is fixed to the holder mounting recess 67 (see FIG. 3) of the end plate 63 of the sewing machine motor 60.

  Next, the stator holder 50 will be described. As shown in FIG. 4, the stator holder 50 is formed in a shallow container shape having a circular shape in plan view. Three attachment holes 57 that penetrate the stator holder 50 in the height direction (thickness direction) are provided on the outer periphery of the stator holder 50. These mounting holes 57 are screw holes for inserting and tightening screws 82 (see FIG. 2). The attachment holes 57 are provided at positions opposite to the three attachment holes 66 provided in the end plate 63 of the sewing machine motor 60. A portion of the outer periphery of the stator holder 50 facing the terminal portion 46 of the resolver stator 40 has a horizontally long elliptical terminal insertion hole 58 for inserting a plurality of terminals 47 provided in the terminal portion 46. Is provided.

  As shown in FIGS. 4 and 5, a mounting recess 51 for fixing the resolver stator 40 is provided inside the stator holder 50. As shown in FIG. 4, a shaft hole 52 into which the rotation shaft 77 of the sewing machine motor 60 is inserted is provided at the center of the bottom surface 51 a of the mounting recess 51. Furthermore, a ring-shaped locking portion 53 is provided along the inner periphery of the shaft hole 52 so as to protrude toward the inside of the mounting recess 51. The inside of the annular portion 41 of the resolver stator 40 is locked to the locking portion 53.

  Further, as shown in FIGS. 4 and 5, a step portion 54 is provided around the inner peripheral surface 51b of the mounting recess 51. The step portion 54 has a diameter that decreases inward from the middle position in the height direction to the bottom surface 51a. And the bottom part of the resolver stator 40 is mounted with respect to the mounting surface 54a (refer FIG. 6) orthogonal to the internal peripheral surface 51b of the step part 54. As shown in FIG. As a result, the resolver stator 40 is positioned in the mounting recess 51. Then, six linear accumulating grooves 55 extending in parallel to the height direction (thickness direction) of the stator holder 50 are formed on the inner peripheral surface 51b opposite to the bottom surface 51a side from the stepped portion 54. They are provided at predetermined intervals.

  Furthermore, as shown in FIGS. 5 and 6, one guide groove 56 is provided along the boundary portion between the mounting surface 54 a and the inner peripheral surface 51 b of the stepped portion 54. The guide grooves 56 communicate with respective one end portions of the six pool grooves 55 extending toward the step 54 side. These six accumulation grooves 55 and one guide groove 56 are used to remove the excess amount of the adhesive applied to the inner peripheral surface 51b when the resolver stator 40 is fixed to the mounting recess 51 with an adhesive. It is a groove for escaping. By using such a stator holder 50, the resolver stator 40 can be fixed to the end plate 63 of the sewing machine motor 60 without applying stress to the electromagnetic steel plate of the resolver stator 40.

  Next, the rotor holder 20 will be described. As shown in FIG. 7, the rotor holder 20 is formed in a cylindrical shape with a flange. The rotor holder 20 is mainly configured by a cylindrical portion 21 formed in a cylindrical shape and a flange portion 22 provided in a bowl shape from one axial end side of the cylindrical portion 21. In the flange portion 22, three attachment holes 25 penetrating in the thickness direction of the flange portion 22 (parallel to the axial direction of the cylindrical portion 21) are formed at predetermined intervals. These mounting holes 25 are holes for fixing with screws 81 and are provided at positions facing the mounting holes 12 of the manual pulley 8. Further, a surface of the flange portion 22 facing the resolver stator 40 is provided with a first protective cylinder 26 that surrounds and protects the cylindrical portion 21, and is coaxially provided with the first protective cylinder 26. A second protective cylinder 27 having a short diameter is also provided. Further, the cylindrical portion 21 protrudes from the inside of the first protective cylinder 26 and the second protective cylinder 27 and extends. A rotating shaft 77 of the sewing machine motor 60 is inserted into the shaft hole 23 of the cylindrical portion 21 and fixed.

  Further, as shown in FIG. 7, in the portion of the cylindrical portion 21 where the resolver rotor 30 is extrapolated, there are six pool grooves 24 (2 in FIG. 5) extending in parallel to the axial direction of the cylindrical portion 21. (Only the book is shown) are provided at predetermined intervals. The reservoir groove 24 is a groove for releasing a surplus portion of the adhesive applied to the outer peripheral surface of the cylindrical portion 21 when the resolver rotor 30 is extrapolated to the cylindrical portion 21 and fixed with an adhesive. By using such a rotor holder 20, the resolver rotor 30 can be fixed to the rotating shaft 77 of the sewing machine motor 60 without applying stress to the electromagnetic steel plate of the resolver rotor 30.

  Next, the manual pulley 8 will be described. As shown in FIG. 3, the manual pulley 8 is formed in a trapezoidal shape when viewed from the side. The manual pulley 8 is mainly composed of a substantially cylindrical pulley body 9 and a circular fixing plate 10 which is provided so as to close the inside of the pulley body 9 and is fixed to the rotor holder 20. A shaft hole 11 for inserting the other end of the cylindrical portion of the rotor holder 20 is provided at the center of the fixed plate 10. Further, three elliptical attachment holes 12 are provided at predetermined intervals so as to surround the shaft hole 11. These mounting holes 12 are screw holes for tightening screws 81 (see FIG. 2) used when the manual pulley 8 is fixed to the rotor holder 20. By fixing such a manual pulley 8 to the rotor holder 20 fixed to the rotating shaft 77 of the sewing machine motor 60, the sewing machine main shaft 7 can be manually rotated via the manual pulley 8.

  Next, a method for fixing the resolver stator 40 to the stator holder 50 will be described. First, an adhesive is applied to the inner peripheral surface 51b of the mounting recess 51 of the stator holder 50 shown in FIG. Next, the resolver stator 40 is fitted into the mounting recess 51 of the stator holder 50 from the bottom side, and is pushed in until the bottom portion of the resolver stator 40 is placed on the placement surface 54 a of the stepped portion 54. Then, a part of the excess adhesive applied to the inner peripheral surface 51 b moves in the direction in which the resolver stator 40 is pushed in and is directly pushed out into the six accumulation grooves 55.

  On the other hand, the adhesive located at a location away from the six accumulation grooves 55 cannot escape into the accumulation grooves 55. However, the adhesive moves as it is toward the mounting surface 54 a of the stepped portion 54 and is pushed out into the guide groove 56. That is, even if a part of the surplus adhesive cannot be directly released to the accumulation groove 55, it can escape to the guide groove 56 and be further guided to the accumulation groove 55. Therefore, it is possible to prevent the adhesive from leaking or dripping from the contact surface between the mounting recess 51 of the stator holder 50 and the resolver stator 40. Furthermore, since excess adhesive can be released to the accumulation groove 55 and the guide groove 56, the resolver stator 40 can be accurately fixed to the mounting recess 51 of the stator holder 50. Further, since the resolver stator 40 is fixed with an adhesive, no stress is applied to the electromagnetic steel sheet of the resolver stator 40, and the magnetic characteristics of the electromagnetic steel sheet can be prevented from changing. Therefore, the rotation angle of the rotation shaft 77 of the sewing machine motor 60 can be accurately detected.

  Next, a method for fixing the resolver rotor 30 to the rotor holder 20 will be described. First, an adhesive is applied to the outer peripheral surface of the cylindrical portion 21 of the rotor holder 20 shown in FIG. Next, the resolver rotor 30 is extrapolated into the cylindrical portion 21 and pushed into contact with the tip of the second protective cylinder 27. Then, the excess adhesive applied to the outer peripheral surface of the cylindrical portion 21 moves in the direction in which the resolver rotor 30 is pushed, and is pushed out to any of the six accumulation grooves 24. Therefore, it is possible to prevent the adhesive from protruding or dripping from between the outer peripheral surface of the cylindrical portion 21 of the rotor holder 20 and the inner peripheral surface of the resolver rotor 30. Furthermore, since excess adhesive can be accumulated in the groove 24, the resolver rotor 30 can be accurately fixed to the cylindrical portion 21 of the rotor holder 20. In addition, since the resolver rotor 30 is fixed with an adhesive, no stress is applied to the electromagnetic steel sheet of the resolver rotor 30, and the magnetic characteristics of the electromagnetic steel sheet can be prevented from changing. Therefore, the rotation angle of the rotation shaft 77 of the sewing machine motor 60 can be accurately detected.

  Next, a method for fixing the resolver 17 to the sewing machine motor 60 will be described. As shown in FIGS. 2 and 3, in order to fix the resolver 17 to the sewing machine motor 60, first, the resolver stator 40 is fixed to the mounting recess 51 of the stator holder 50 with an adhesive by the above method. On the other hand, the resolver rotor 30 is also extrapolated to the cylindrical portion 21 of the rotor holder 20 and fixed with an adhesive by the above method. The rotating shaft 77 of the sewing machine motor 60 is inserted into the shaft hole 52 of the stator holder 50 while aligning the stator holder 50 to which the resolver stator 40 is fixed with the holder mounting recess 67 of the end plate 63 of the sewing machine motor 60. . Further, the three attachment holes 57 of the stator holder 50 are respectively aligned with the three attachment holes 66 provided in the end plate 63 of the sewing machine motor, and the screws 82 (see FIG. 2) are sequentially tightened. As a result, the stator holder 50 can be fixed to the end plate 63 of the sewing machine motor 60, so that it can be supported on the end plate 63 of the sewing machine motor 60 without applying stress to the resolver stator 40.

  Further, the shaft hole 23 of the cylindrical portion 21 of the rotor holder 20 to which the resolver rotor 30 is fixed is inserted and fixed to the rotation shaft 77 of the sewing machine motor 60. Thereby, the resolver rotor 30 is fixed to the rotating shaft 77 of the sewing machine motor 60 via the rotor holder 20, so that the resolver rotor 30 can be rotated together with the rotating shaft 77. Further, the manual pulley 8 is fixed to the flange portion 22 of the rotor holder 20. In this case, the inner side of the manual pulley 8 is fitted to the flange portion 22 from the opposite side of the rotor holder 20 to the side on which the resolver rotor 30 is fixed. Then, the three attachment holes 12 provided in the manual pulley 8 are respectively aligned with the three attachment holes 25 provided in the flange portion 22 of the rotor holder 20, and the screws 81 (see FIG. 2) are tightened. Thereby, the manual pulley 8 can be fixed to the rotor holder 20. Thus, the resolver 17 can be fixed to the sewing machine motor 60.

  As described above, the sewing machine 1 according to this embodiment includes the resolver 17 that detects the rotation angle of the rotation shaft 77 of the sewing machine motor 60, and includes a fixing structure that fixes the resolver 17 to the sewing machine motor 60. . In the fixing structure of the resolver 17, the resolver rotor 30 and the resolver stator 40 constituting the resolver 17 are fixed to the rotor holder 20 and the stator holder 50 with an adhesive. Accordingly, the resolver rotor 30 and the resolver stator 40 can be fixed without applying stress. Furthermore, by providing the retaining groove 24 in the cylindrical portion 21 of the rotor holder 20 and providing the retaining groove 55 and the guide groove 56 on the inner peripheral surface 51b of the mounting recess 51 of the stator holder 50, it is possible to prevent the adhesive from protruding and sagging. Thereby, the resolver 17 can be fixed with high accuracy.

  Needless to say, the resolver fixing structure and the sewing machine of the present invention are not limited to the above-described embodiment, and various modifications are possible. For example, the method for fixing the stator holder 50 to the end plate 63 of the sewing machine motor 60 is not limited to the above embodiment.

  The resolver fixing structure of the present invention can be applied to a machine including a resolver composed of a stator and a rotor for detecting a rotation angle of a rotating shaft of a motor.

1 is an overall perspective view of a sewing machine 1. FIG. 3 is a cross-sectional view showing a structure for fixing a resolver 17 to a sewing machine motor 60. FIG. FIG. 3 is an exploded perspective view showing a positional relationship among a manual pulley 8, a rotor holder 20, a resolver 17, a stator holder 50, and a sewing machine motor 60. 3 is a perspective view of a stator holder 50. FIG. It is AA arrow direction sectional drawing shown in FIG. FIG. 6 is an enlarged view of a W portion surrounded by a two-dot chain line shown in FIG. 5. 2 is a perspective view of a rotor holder 20. FIG.

Explanation of symbols

1 sewing machine 7 sewing machine main shaft 8 manual pulley 17 resolver 20 rotor holder 24 pool groove 30 resolver rotor 40 resolver stator 50 stator holder 51 mounting recess 55 pool groove 56 guide groove 60 sewing machine motor 77 rotating shaft

Claims (6)

A resolver fixing structure comprising: an annular rotor attached to a rotating shaft of a motor; and an annular stator for coaxially inserting the rotor, wherein a stator holder for supporting the stator is fixed to the motor. ,
The stator holder is provided with a circular recess for housing the stator and attaching it with an adhesive,
A resolver fixing structure characterized in that a reservoir for releasing excess of the adhesive is provided between the inner peripheral surface of the recess and the outer peripheral surface of the stator.   The resolver fixing structure according to claim 1, wherein the reservoir is a reservoir groove provided on an inner peripheral surface of the recess or an outer peripheral surface of the stator. A plurality of the accumulation grooves are provided on the inner peripheral surface of the recess, and are extended in the height direction of the recess,
The resolver fixing structure according to claim 2, further comprising a guide groove provided along an outer periphery of a bottom portion of the concave portion where the stator contacts, and communicating with the pool groove. A resolver comprising: an annular rotor attached to a rotating shaft of a motor; and an annular stator for coaxially inserting the rotor, and a cylindrical rotor holder for externally holding the rotor fixed to the rotating shaft The fixed structure of
The rotor is extrapolated to the rotor holder and fixed with an adhesive,
A resolver fixing structure characterized in that a reservoir for releasing excess of the adhesive is provided between the outer peripheral surface of the rotor holder and the inner peripheral surface of the rotor.   The resolver fixing structure according to claim 4, wherein the reservoir is a reservoir groove provided on an outer peripheral surface of the recess or an inner peripheral surface of the rotor.   A sewing machine comprising the resolver fixing structure according to any one of claims 1 to 5, wherein a rotation angle of a sewing machine motor for rotationally driving a main shaft for driving a needle bar is detected.

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