JP2018125960A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor to the disc of which a foreign matter is hard to adhere.SOLUTION: A sewing machine motor 32 is provided with: a housing 101; an output shaft 110; a disc 131; a box-like body 120; and a box-like member 70. The housing 101 rotatably supports the output shaft 110. The output shaft 110 is provided with a second projection 112 projecting from the housing 101 to the right side. The disc 131 is fixed to the second projection 112. The box-like body 120 is fixed to the housing 101 to accommodate the disc 131. The box-like body 120 is provided with an opening 122 at a wall part 121 which is a right end. The opening 122 is recessed to the left. The opening 122 is provided with a circular hole 122A penetrating the wall part 121 in the horizontal direction. The second projection 112 is inserted into the circular hole 122A. The plate-like member 70 blocks the opening 122 of the box-like body 120 between it and the output shaft 110. The second projection 112 is inserted into an insertion hole 72 of the plate-like member 70. The insertion hole 72 contacts the second projection 112 over a peripheral direction of the output shaft 110.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor.

  2. Description of the Related Art Conventionally, a motor that can detect the rotational position of an output shaft that passes through a housing and is inserted is known. For example, the motor disclosed in Patent Document 1 includes a rotation shaft, a casing (housing), a rotation detection unit, a light emitting unit, and a light receiving unit. One end of the rotating shaft protrudes from the casing to one side. The other end of the rotating shaft projects from the opening of the casing to the other side. The rotation detector is a disk provided on the rotating shaft inside the casing. The rotation detection unit includes a plurality of slits arranged along the circumferential direction of the rotation shaft. The light-emitting part and the light-receiving part are opposed to each other with the rotation detection part in between inside the casing. In accordance with the rotation position of the rotation detection unit, the light receiving unit switches between a light receiving state in which light from the light emitting unit is received and a non-light receiving state in which light from the light emitting unit is not received.

Japanese Utility Model Publication 4-102060

  In the motor, foreign matter such as dust and powder may enter the casing through the opening. If the foreign matter that has entered the inside of the casing adheres to the rotation detection unit, the foreign matter may block light from the light emitting unit. In this case, when the motor is driven, there is a possibility that the light receiving unit is not properly switched between the light receiving state and the non-light receiving state.

  An object of the present invention is to provide a motor in which foreign matter hardly adheres to a disk.

  The motor of the present invention includes a housing, a first projecting portion that is supported rotatably inside the housing, projects from the housing to one side, and a second projecting portion that projects from the housing to the other side. And a box-like body that is provided in the housing, accommodates a part of the second projecting portion, and has an opening in which the other portion of the second projecting portion projects to the other side. A disk having a predetermined pattern provided along the circumferential direction with respect to the output shaft provided on the part of the second protrusion, and provided on the inner side of the box-shaped body. A motor including: a light emitting unit that emits light; a light receiving unit that receives light emitted from the light emitting unit; and a rotating body provided on the other part of the second projecting unit. A plate that has a thickness in the extending direction of the output shaft and is inserted through the second protrusion. Has a hole, the insertion hole, characterized in that a plate-like member in contact with the second protruding portion over the circumferential direction.

  According to the said structure, the penetration hole of a plate-shaped member contacts a 2nd protrusion part over the circumferential direction, and a plate-shaped member closes the opening part of a box-shaped body between output shafts. The plate-like member can suppress foreign matter from entering the box-like body through the opening. Therefore, it is possible to realize a motor in which foreign matter hardly adheres to the disk.

  In the motor, the plate-like member may have flexibility. Since the slidability between the plate member and the output shaft is improved, an excessive load is unlikely to act on the driving motor.

  In the motor, the plate member may be a cloth. The slidability between the plate member and the output shaft is further improved.

  In the motor, the plate member may contain a lubricant. The slidability between the plate member and the output shaft is further improved.

  In the motor, the second protrusion and the insertion hole of the plate-like member may be in a press-fitted state. The motor can further suppress foreign matter from entering the box-like body.

  The motor may include fixing means for fixing the plate-like member to the opening. When the motor is driven, the second protrusion of the output shaft can slide stably with respect to the insertion hole of the plate-like member.

  In the motor, the opening is a concave shape that is recessed toward the one side from the other end surface of the box-like body, and the fixing means is a protrusion that is provided in the opening and protrudes to the other side. And an entry hole provided in the plate-like member and into which the protrusion enters. An operator who assembles the motor can fix the plate-like member to the box-like body by closing the opening with the plate-like member so that the protrusion enters the entry hole. Therefore, the assembly of the motor is improved.

  The motor includes a cylindrical body that is provided in the housing and surrounds the box-shaped body over the circumferential direction, and the cylindrical body is a cylindrical outer wall portion on the one side with respect to the rotating body; A radial wall with respect to the output shaft, and a projecting wall portion projecting from the cylindrical outer wall portion to the other side on the box-like body side from the cylindrical outer wall portion, and the rotating body of the projecting wall portion You may provide the outer wall part which opposes a front-end | tip part from the outer side of the said radial direction, and the opposing wall part which opposes the said outer wall part on both sides of the said front-end | tip part of the said protrusion wall part. Since the protruding wall portion of the cylindrical body is between the outer wall portion and the opposing wall portion of the rotating body, the foreign matter is unlikely to enter the inside of the cylindrical body. Therefore, the motor can make it difficult for foreign matter to adhere to the disk.

  The motor includes a connecting member that is connected to the rotating body on the other side of the plate-like member and on the inner side of the cylindrical body, and that is inserted through the second projecting portion. An extended wall portion that protrudes inward in the radial direction from the protruding wall portion and extends in the circumferential direction may be provided, and the connecting member may be opposed to the extended wall portion in the radial direction. Since the connecting member is inside the extending wall portion, the motor can further suppress the foreign matter from entering the inside of the cylindrical body.

The perspective view of the sewing machine 1. FIG. The perspective view of the sewing machine motor 32. FIG. The exploded perspective view of the sewing machine motor 32. FIG. The enlarged view of the area | region enclosed with the dashed-two dotted line W1 of FIG. FIG. 6 is a cross-sectional perspective view of the sewing machine motor 32. FIG. 3 is an enlarged cross-sectional view of a right portion of the sewing machine motor 32 in the direction of arrows AA in FIG. The perspective view of the electrical equipment part 200. FIG. Sectional drawing of the resin member 250 in the BB arrow direction of FIG. The enlarged view of the area | region enclosed with the dashed-two dotted line W2 of FIG.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, left, right, front, back, and top and bottom indicated by arrows in the figure are used. A sewing machine 1 shown in FIG. 1 is, for example, a lockstitch sewing machine.

  With reference to FIG. 1 and FIG. 2, the outline of the structure of the sewing machine 1 which has the sewing machine motor 32 which is a motor of this invention is demonstrated. The sewing machine 1 includes a bed portion 2, a pedestal column portion 3, an arm portion 4, and the like. The bed portion 2 extends in the left-right direction, and includes a lower shaft 21, a shuttle mechanism 6 and the like inside. The pedestal 3 extends upward from the right end of the bed 2 and includes a timing belt 31, a sewing machine motor 32, and the like. The arm portion 4 extends leftward from the upper portion of the pedestal column portion 3. The arm portion 4 faces the upper surface of the bed portion 2 and includes a main shaft 41 and the like inside. The sewing machine motor 32 rotates the main shaft 41 clockwise as viewed from the left side.

  The arm portion 4 includes a tip portion 5 on the left side. The distal end portion 5 includes a needle bar vertical movement mechanism 45, a balance drive mechanism 50, a needle bar drive mechanism 10 and the like. The right end of the main shaft 41 is connected to the sewing machine motor 32, and the left end is connected to the needle bar vertical movement mechanism 45. The sewing machine motor 32 rotates the main shaft 41. The main shaft 41 transmits the rotational force from the sewing machine motor 32 to the needle bar vertical movement mechanism 45 and the balance drive mechanism 50, and drives the needle bar vertical movement mechanism 45 and the balance drive mechanism 50. The balance drive mechanism 50 includes a balance 51. The balance 51 moves up and down during sewing to pull up the upper thread. The left side of the balance drive mechanism 50 is connected to the needle bar drive mechanism 10.

  The needle bar drive mechanism 10 includes a needle bar 11, needle bar support cylinders 12 and 13, a needle bar holder 14, and the like. The needle bar support cylinders 12 and 13 are fixed to the machine frame of the sewing machine 1, respectively. The needle bar support cylinders 12 and 13 support the upper and lower parts of the needle bar 11, respectively, and guide the vertical movement of the needle bar 11. The needle bar holder 14 holds the needle bar 11 at a position between the needle bar support cylinder 12 and the needle bar support cylinder 13. The needle bar holder 14 is connected to the needle bar vertical movement mechanism 45 via the balance drive mechanism 50. The needle bar vertical movement mechanism 45 transmits the driving force accompanying the rotation of the main shaft 41 to the needle bar holder 14. The needle bar holder 14 is driven in conjunction with the balance 51 to move the needle bar 11 up and down. The lower end portion of the needle bar 11 extends downward from the distal end portion 5. The needle bar 11 has a sewing needle 15 attached to its lower end. The sewing needle 15 moves up and down as the main shaft 41 rotates.

  The lower shaft 21 extends in the left-right direction and includes a pulley 23 at the right end. The main shaft 41 includes a pulley 42. The pulley 42 and the pulley 23 are connected via the timing belt 31. The sewing machine motor 32 rotates the lower shaft 21 clockwise via the timing belt 31 when viewed from the left side. The lower shaft 21 includes a lower shaft gear 22 on the left side of the pulley 23. The lower shaft 21 is connected to the cloth feed mechanism on the left side of the lower shaft gear 22. The cloth feed mechanism is a well-known mechanism and feeds the cloth in conjunction with the vertical movement of the needle bar 11.

  The hook mechanism 6 includes a rotary hook 61, a hook shaft 62, and the like. The shuttle shaft 62 extends substantially horizontally in the left-right direction and is disposed in parallel with the lower shaft 21. The hook shaft 62 includes a hook shaft gear 63 at the right end. The hook shaft gear 63 meshes with the lower shaft gear 22 provided on the lower shaft 21. Therefore, the shuttle shaft 62 follows the lower shaft 21 and rotates counterclockwise as viewed from the left side. The left end of the hook shaft 62 is connected to the rotary hook 61. Therefore, the rotary hook 61 rotates together with the hook shaft 62. The rotary hook 61 is equipped with a bobbin case 64. The bobbin case 64 accommodates a bobbin (not shown) around which a lower thread is wound.

  The bed part 2 is provided with a needle plate 25 at the top. The shuttle mechanism 6 is below the needle plate 25. The needle bar 11 is located above the needle plate 25. When the needle bar 11 is lowered, the lower end portion of the sewing needle 15 passes through the needle hole 26 opened in the needle plate 25 and reaches the rotary hook 61. The rotary hook 61 entangles the lower thread pulled out from the bobbin case 64 with the upper thread held by the sewing needle 15. The balance 51 pulls the upper thread entangled with the lower thread onto the needle plate 25. Therefore, the sewing machine 1 executes a sewing operation for forming stitches on the cloth.

  The sewing machine 1 includes a control unit below the bed unit 2. The control unit includes a CPU, a ROM, a RAM, a drive circuit, and the like. The CPU controls the sewing machine 1. As will be described later, the CPU is electrically connected to the encoder 130 (see FIG. 6) of the sewing machine motor 32 via the cable 233. The ROM stores various programs. The RAM temporarily stores various values necessary for executing the program. The drive circuit is electrically connected to the stator inside the sewing machine motor 32 via the connection portion 29. The CPU controls the drive of the sewing machine motor 32 by transmitting a control signal to the sewing machine motor 32 via the drive circuit.

  The structure of the sewing machine motor 32 will be described with reference to FIGS. The sewing machine motor 32 is a DC brushless motor. 2 and 3, the sewing machine motor 32 includes a housing 101, an output shaft 110, a box-like body 120, an electrical component 200, a plate-like member 70, fixing means 170 (see FIG. 4), a connecting member 180, and a cylindrical shape. A body 160 and a rotating body 150 are provided.

  As shown in FIGS. 3 and 5, the housing 101 is a cylindrical body extending in the left-right direction and houses a stator and the like. The housing 101 includes a first circular hole 101A and a second circular hole 101B. The first circular hole 101A opens to the left. The second circular hole 101B opens to the right. The housing 101 includes two bearings 117 inside. One of the two bearings 117 is in a position close to the first circular hole 101A from the right side, and the other of the two bearings 117 is in a position close to the second circular hole 101B from the left side. The first circular hole 101A, the second circular hole 101B, and the two bearings 117 are coaxial.

  The output shaft 110 extends in the left-right direction. The output shaft 110 is inserted into the first circular hole 101A and the second circular hole 101B and is rotatably supported by two bearings 117. The output shaft 110 includes a first protrusion 111 and a second protrusion 112. The first protrusion 111 is a portion of the output shaft 110 that protrudes leftward from the first circular hole 101A. The 1st protrusion part 111 is connected with the pulley 42 (refer FIG. 1). The second protrusion 112 is a portion of the output shaft 110 that protrudes to the right from the second circular hole 101B. Hereinafter, the left part of the second protrusion 112 is referred to as “a part 112A of the second protrusion 112”, and the right part of the second protrusion 112 is referred to as “the other part 112B of the second protrusion 112”. Hereinafter, the circumferential direction based on the output shaft 110 is referred to as “circumferential direction”, and the radial direction based on the output shaft 110 is referred to as “radial direction”.

  As shown in FIG. 3, the box-shaped body 120 is a resin rectangular parallelepiped that opens to the left, and is fixed to the right surface of the housing 101. The box-shaped body 120 includes a wall 121, a peripheral wall 123, and an opening 122. The wall 121 is a plate having a rectangular shape in side view and having a thickness in the left-right direction. The peripheral wall 123 extends leftward from the peripheral end of the wall 121. The peripheral wall portion 123 includes a first electric wire insertion hole in the lower left rear portion. The first electric wire insertion hole penetrates the peripheral wall portion 123.

  As shown in FIG. 4, the opening 122 is a concave shape that is recessed leftward from the right end surface 121 </ b> A of the wall 121, and is circular when viewed from the right side. A circular hole 122A formed in the bottom, which is the left portion of the opening 122, penetrates the wall 121 in the left-right direction. The inner diameter of the circular hole 122A is larger than the outer diameter of the second protrusion 112. The second protrusion 112 of the output shaft 110 is inserted into the circular hole 122A (see FIG. 3). Specifically, a part 112A of the second protrusion 112 is housed inside the box-shaped body 120, and the other part 112B of the second protrusion 112 protrudes rightward from the opening 122 (see FIG. 3). The electrical component 200 (see FIG. 3) is accommodated inside the box-shaped body 120. Details of the electrical component 200 will be described later.

  The plate-like member 70 has a disc shape having a thickness in the left-right direction, and is accommodated in the opening 122. The plate-like member 70 is a plate having flexibility. The plate-like member 70 of this embodiment is a cloth, and more specifically, a cloth formed of polyamide. The plate-like member 70 contains a lubricant. An example of the lubricant is a fluorine-type thin film lubricant. The plate-like member 70 has an insertion hole 72. The inner diameter of the insertion hole 72 is slightly smaller than the outer diameter of the output shaft 110. The second protrusion 112 (see FIG. 3) of the output shaft 110 is inserted into the insertion hole 72. The second protrusion 112 and the insertion hole 72 are in a press-fit state. The insertion hole 72 contacts the second protrusion 112 over the circumferential direction.

  The fixing means 170 fixes the plate member 70 to the opening 122. The fixing means 170 includes a protrusion 172 and an entry hole 175. The protrusion 172 is provided on the bottom of the opening 122 on the outer side in the radial direction than the circular hole 122A. The protrusion 172 has a cylindrical shape protruding rightward from the opening 122. The entrance hole 175 is provided in the plate member 70. The entrance hole 175 has a circular shape that penetrates the plate member 70 in the thickness direction. The inner diameter of the entry hole 175 is substantially the same as the outer diameter of the protrusion 172. The protrusion 172 enters the entry hole 175.

  An operator who assembles the sewing machine motor 32 can fix the plate-like member 70 to the box-like body 120 by attaching the plate-like member 70 to the opening 122 so that the protrusion 172 enters the entry hole 175. The fixing means 170 can restrict the rotation of the plate member 70 along the circumferential direction. In the present embodiment, four protrusions 172 and four entry holes 175 are provided at equal intervals along the circumferential direction.

  As shown in FIG. 3, the connecting member 180 is fixed to the other portion 112 </ b> B of the second protruding portion 112 on the right side of the plate-like member 70. The connecting member 180 is a metal disk having a thickness in the left-right direction. The connecting member 180 has a central hole 181 and three fastening holes 182. The central hole 181 is circular when viewed from the right side, and penetrates the central portion of the connecting member 180 in the thickness direction. The other part 112 </ b> B of the second protrusion 112 is inserted into the central hole 181. The other part 112B and the center hole 181 are in a press-fit state. Therefore, the connecting member 180 is connected to the output shaft 110. The three fastening holes 182 are formed at the circumferential end of the connecting member 180 at equal intervals along the circumferential direction.

  The cylindrical body 160 is a resin-made cylindrical shape along the left-right direction, and is fixed to the right surface of the housing 101. The cylindrical body 160 accommodates the box-shaped body 120, the plate-shaped member 70, and the connecting member 180 inside. The cylindrical body 160 includes a cylindrical outer wall portion 162, a protruding wall portion 165, and an extending wall portion 167. The cylinder outer wall 162 is on the right side of the outer peripheral surface of the housing 101. The cylinder outer wall 162 surrounds the box-shaped body 120, the plate-shaped member 70, and the connecting member 180 over the circumferential direction. The cylinder outer wall portion 162 includes a second electric wire insertion hole 168. The second electric wire insertion hole 168 faces the first electric wire insertion hole of the box-shaped body 120 from the outside in the radial direction. The protruding wall portion 165 is located between the cylindrical outer wall portion 162 and the box-shaped body 120 in the radial direction. The protruding wall portion 165 protrudes to the right from the cylindrical outer wall portion 162. The right end portion of the protruding wall portion 165 is a tip portion 165A. The extending wall portion 167 protrudes radially inward from the protruding wall portion 165 and extends over the circumferential direction of the tubular body 160. The extending wall portion 167 surrounds the outer peripheral surface of the connecting member 180. In other words, the connecting member 180 opposes the extending wall portion 167 on the radially inner side. The right end of the extending wall portion 167 is located on the right side of the left end of the connecting member 180 (see FIG. 6).

  As illustrated in FIG. 6, the rotating body 150 has a cylindrical shape provided on the other portion 112 </ b> B of the second protruding portion 112 on the right side of the cylindrical outer wall portion 162 of the cylindrical body 160. The rotating body 150 includes an outer wall portion 152, an opposing wall portion 154, and a bottom wall portion 155. The outer wall 152 is on the right side of the outer wall 162 of the cylindrical body 160. The outer wall 152 surrounds the protruding wall 165 of the cylindrical body 160 over the circumferential direction. The outer wall portion 152 faces the distal end portion 165A of the protruding wall portion 165 from the outside in the radial direction. The opposing wall portion 154 extends while inclining radially inward from the right portion of the outer wall portion 152 toward the left side. The opposing wall part 154 is formed over the circumferential direction. The connection position between the opposing wall portion 154 and the outer wall portion 152 is on the outer side in the radial direction and on the right side with respect to the distal end portion 165A. The left end portion of the facing wall portion 154 faces the outer wall portion 152 with the tip end portion 165A interposed therebetween. The bottom wall part 155 is connected to the left end part of the opposing wall part 154 in the circumferential direction. The bottom wall portion 155 has a disk shape that faces the connecting member 180 from the right side. The bottom wall portion 155 includes three insertion holes 155A. The three insertion holes 155A respectively oppose the three fastening holes 182 of the connecting member 180 from the right side. The three screws 157 are inserted into the insertion holes 155A and fastened to the fastening holes 182, respectively. Therefore, the rotating body 150 is connected to the connecting member 180. That is, the rotating body 150 is fixed to the other portion 112 </ b> B of the second protruding portion 112 through the connecting member 180.

  The electrical component 200 will be described with reference to FIGS. The electrical component 200 is housed inside the box-shaped body 120 (see FIG. 3). As shown in FIG. 7, the electrical component 200 includes a connecting portion 201, a substrate 90, a fastening member 199, an encoder 130, and a resin member 250. The connecting unit 201 connects the substrate 90 to the housing 101. The connecting portion 201 of this embodiment has a cylindrical shape that extends rightward from the right surface of the housing 101. In other words, the connecting part 201 is directly connected to the housing 101. The cylinder hole (refer FIG. 8) of the connection part 201 is the fastening hole 202 opened to the right. In other words, the fastening hole 202 is along the extending direction of the output shaft 110.

  As shown in FIGS. 7 and 8, the substrate 90 is provided on the right side of the housing 101 and around a part 112 </ b> A of the second protrusion 112. The substrate 90 has a thickness in the left-right direction and extends perpendicular to the extending direction of the output shaft 110. The substrate 90 includes a left surface 92, a right surface 93, an insertion hole 98, a wiring pattern 95, and a counter hole 91. The left surface 92 is a plate surface facing left, and the right surface 93 is a plate surface facing right. The insertion hole 98 is notched with the upper end of the substrate 90 facing downward, and penetrates the substrate 90 in the thickness direction. The insertion hole 98 passes through a part 112 </ b> A of the second protrusion 112. The wiring pattern 95 is a conductive member formed on the left surface 92. The conductive member is, for example, a copper foil. The wiring pattern 95 is at a position avoiding the connecting portion 201. 7 and 9, a part of the wiring pattern 95 is schematically shown. The counter hole 91 penetrates the substrate 90. The facing hole 91 faces the fastening hole 202 of the connecting portion 201 from the right side. That is, the counter hole 91 is at a position avoiding the wiring pattern 95. In the present embodiment, the washer 100 is disposed on the right side of the counter hole 91.

  As shown in FIGS. 8 and 9, the fastening member 199 includes a shaft portion 199A and a head portion 199B. The shaft portion 199 </ b> A is inserted into the washer 100 and the counter hole 91 and fastened to the fastening hole 202. The head portion 199B is connected to the right end of the shaft portion 199A. The head portion 199 </ b> B sandwiches the substrate 90 between the connecting portion 201 from the side opposite to the fastening hole 202 of the connecting portion 201. The fastening member 199 is made of metal and is insulated from the wiring pattern 95. Hereinafter, the shortest distance along the substrate 90 between the head 199B and the wiring pattern 95 is referred to as a “creeping distance”. The creeping distance corresponds to the distance L in FIG. 9 as an example.

  As shown in FIG. 6, the encoder 130 is provided on the left surface 92 of the substrate 90. Two encoders 130 according to the present embodiment are arranged at positions symmetrical with respect to the output shaft 110. The encoder 130 detects the rotational position and rotational speed of the output shaft 110. The encoder 130 is a transmissive encoder. The encoder 130 includes a disk 131 and a reading unit 135. The disk 131 is a sheet having a thickness in the left-right direction. The disk 131 is fixed to a part 112 </ b> A of the second protrusion 112 between the housing 101 and the substrate 90. The disk 131 has a predetermined pattern. The pattern of this embodiment includes a light shielding portion and a light transmitting portion. The light shielding part is a part of the disk 131 having a light shielding color, and the light transmitting part is a part of the disk 131 having a light transmitting color. A plurality of light-shielding portions and light-transmitting portions are provided, and extend radially with the output shaft 110 as a reference. The light shielding parts and the light transmitting parts are alternately arranged at equal intervals along the circumferential direction.

  The reading unit 135 is provided on the left surface 92 of the substrate 90 and is electrically connected to the wiring pattern 95 (see FIG. 9). The reading unit 135 includes a container 134, a light emitting unit 132, and a light receiving unit 133. The container 134 has a box shape connected to the left surface of the substrate 90. The container 134 has a recess 134A that is recessed outward in the radial direction. The encoder 130 enters the recess 134A. As the output shaft 110 rotates, the pattern of the encoder 130 passes through the inside of the recess 134A. The recess 134A has two exposed holes. One of the two exposure holes penetrates the inner left wall portion of the recess 134A in the left-right direction, and the other of the two exposure holes penetrates the inner right wall portion of the recess 134A in the left-right direction. The light emitting unit 132 and the light receiving unit 133 are housed inside the housing 134. The light emitting unit 132 and the light receiving unit 133 are arranged in the left-right direction with two exposure holes in between. The light emitting unit 132 and the light receiving unit 133 are exposed toward the disc 131 through two exposure holes, respectively.

  The light emitting unit 132 emits light to the light receiving unit 133. When the light shielding part of the encoder 130 is between the two exposure holes, the light shielding part blocks the light of the light emitting part 132. Therefore, the light receiving unit 133 does not receive the light from the light emitting unit 132. When the light transmitting part of the encoder 130 is between the two exposed holes, the light of the light emitting part 132 passes through the light transmitting part. Therefore, the light receiving unit 133 receives the light from the light emitting unit 132.

  As shown in FIG. 7, the electrical component 200 includes a connector 220, a cable 233, and a resin member 250. The connector 220 is provided on the right surface 93 of the substrate 90. In other words, the connector 220 is provided on the plate surface of the substrate 90 on the head 199B side. The connector 220 is electrically connected to the wiring pattern 95. The connector 220 opens along the substrate 90. Hereinafter, the direction in which the connector 220 opens is referred to as a “specific direction”. The specific direction corresponds to the arrow P in FIG. 7 and is substantially backward in the present embodiment.

  Hereinafter, the end portion of the right surface 93 of the substrate 90 in the specific direction is referred to as a “specific end portion 96”, and the side surface of the substrate 90 extending from the specific end portion 96 to the left side, which is the housing 101 side, is referred to as a “substrate side surface 97”. The substrate side surface 97 is orthogonal to the left surface 92 and the right surface 93. The specific end portion 96 and the substrate side surface 97 are curved toward the output shaft 110 side. In other words, the specific end portion 96 and the substrate side surface 97 are curved toward a pair of extended wall portions 257 described later.

  As shown in FIGS. 7 to 9, the resin member 250 is provided on the right surface 93 of the substrate 90. The resin member 250 is an insulator that is spaced rearward from the output shaft 110. The resin member 250 includes an entry wall portion 255, a protruding wall portion 258, a first opposing wall portion 251, a specific corner portion 256, a pair of extending wall portions 257, and a second opposing wall portion 252. The entrance wall 255 is a plate having a thickness in the left-right direction. The entry wall 255 enters between the right surface 93 of the substrate 90 and the washer 100. The entrance wall portion 255 has a hole 255A and a peripheral end 255B. The hole 255A has a circular shape as an example. The shaft portion 199A of the fastening member 199 is inserted into the hole 255A. The head portion 199 </ b> B of the fastening member 199 sandwiches the entry wall portion 255 with the substrate 90 via the washer 100. Therefore, the entrance wall 255 is fixed at a position where it enters between the head 199B and the right surface 93. The peripheral end 255B is provided on the right rear side of the hole 255A. The peripheral end 255B extends in the circumferential direction with the shaft portion 199A as a reference.

  The protruding wall portion 258 protrudes from the peripheral end 255B of the entry wall portion 255 to the right side that is the head portion 199B side. The protruding wall portion 258 is orthogonal to the entry wall portion 255. The first facing wall portion 251 extends upward and rearward along the substrate 90 from the right end, which is the tip of the protruding wall portion 258. The first opposing wall portion 251 is orthogonal to the protruding wall portion 258. The first opposing wall portion 251 is on the specific direction side with respect to the connector 220. The first facing wall portion 251 faces the right surface 93 of the substrate 90 with a gap. The specific corner portion 256 is formed at the end of the first opposing wall portion 251 in the specific direction. The specific corner portion 256 is rounded. In other words, the specific corner portion 256 has a round chamfer shape. The specific corner portion 256 has a shape along the specific end portion 96 and is arranged in the thickness direction of the specific end portion 96 and the substrate 90. The specific corner portion 256 is curved along the substrate side surface 97 of the substrate 90.

  The pair of extending wall portions 257 extend from the end portion on the output shaft 110 side of the first opposing wall portion 251 to the right side that is the opposite side to the substrate 90. The pair of extending wall portions 257 are orthogonal to the first opposing wall portion 251. The pair of extending wall portions 257 extend linearly along the specific direction between the output shaft 110 and the specific corner portion 256, and are arranged with a gap therebetween along the specific direction. The second opposing wall portion 252 extends from the specific corner portion 256 to the left side that is the housing 101 side. The second opposing wall portion 252 is curved along the substrate side surface 97 of the substrate 90. The second opposing wall portion 252 faces the substrate side surface 97 of the substrate 90 with a gap.

  The cable 233 includes an insertion portion 231, a plurality of electric wires 232, and a binding band 237. The insertion part 231 is inserted into the connector 220. The insertion part 231 is electrically connected to the wiring pattern 95. The plurality of electric wires 232 are electrically connected to the encoder 130 via the insertion portion 231 and the wiring pattern 95. The electric wire 232 is disposed on the opposite side of the output shaft 110 with respect to the pair of extending wall portions 257. The plurality of electric wires 232 extend along the specific direction from the connector 220 toward the specific corner portion 256, and extend along the pair of extending wall portions 257. The electric wire 232 along the pair of extending wall portions 257 is on the right side with respect to the first opposing wall portion 251. The binding band 237 bundles a plurality of electric wires 232 between the connector 220 and the specific corner portion 256. A part of the binding band 237 is disposed in the gap between the pair of extending wall portions 257. Therefore, the resin member 250 restricts the positional deviation of the binding band 237 in the specific direction.

  The electric wire 232 is bent to the left at the right rear of the specific corner portion 256. The electric wire 232 on the rear side of the specific corner portion 256 extends along the second opposing wall portion 252 of the resin member 250, and the first electric wire insertion hole of the box-shaped body 120 (see FIG. 3) and the second electric wire insertion of the cylindrical body 160. It passes through the hole 168 (see FIG. 3). Therefore, the plurality of electric wires 232 extend to the outside of the sewing machine motor 32 (see FIG. 1). A plurality of electric wires 232 extending to the outside of the sewing machine motor 32 are connected to the control unit of the sewing machine 1. Therefore, the plurality of electric wires 232 electrically connect the control unit and the encoder 130 to each other.

  The operation of the sewing machine motor 32 will be described with reference to FIGS. When the control unit transmits a control signal to the sewing machine motor 32, the sewing machine motor 32 rotates the output shaft 110 clockwise when viewed from the left side. The disk 131, the connecting member 180, and the rotating body 150 rotate together with the output shaft 110. The fixing means 170 restricts the plate member 70 from rotating integrally with the output shaft 110, and the second protrusion 112 slides with respect to the insertion hole 72 of the plate member 70.

  As the output shaft 110 rotates, the light shielding portion and the light transmitting portion of the disk 131 alternately pass through the concave portions 134A of the reading unit 135. The light receiving unit 133 is alternately switched between a state of receiving light and a state of not receiving light. The cycle in which the state of the light receiving unit 133 changes varies according to the rotation position and rotation speed of the output shaft 110. Therefore, the encoder 130 detects the rotational position and rotational speed of the output shaft 110, and transmits the detection result to the CPU of the control unit.

  As described above, the insertion hole 72 of the plate-like member 70 contacts the second projecting portion 112 in the circumferential direction, and the plate-like member 70 closes the opening 122 of the box-like body 120 between the output shaft 110. Therefore, the plate-like member 70 restricts the passage of the air flow generated around the output shaft 110, the disk 131, the connecting member 180, and the rotating body 150 through the opening 122 as the output shaft 110 rotates. Therefore, foreign matter such as dust and powder outside the sewing machine motor 32 is unlikely to enter the box-shaped body 120 through the opening 122. Therefore, it is possible to realize the sewing machine motor 32 in which foreign matter hardly adheres to the disk 131 of the encoder 130 inside the box-shaped body 120. In the present embodiment, the sewing machine motor 32 is provided in the sewing machine 1. Along with the sewing operation of the sewing machine 1, dust such as lint is easily generated around the sewing machine 1. The sewing machine motor 32 can suppress dust such as lint from adhering to the disk 131.

  The plate-like member 70 has flexibility. When the sewing machine motor 32 is driven, the slidability between the insertion hole 72 of the plate-like member 70 and the second protrusion 112 is improved. Therefore, an excessive load is unlikely to act on the driven sewing machine motor 32. The plate-like member 70 is a cloth. Therefore, the slidability between the plate-like member 70 and the insertion hole 72 is further improved. In this embodiment, the material of the plate-like member 70 is polyamide. Therefore, the sewing machine motor 32 can increase the ignition point of the plate-like member 70 and improve the flame retardance of the plate-like member 70.

  The plate-like member 70 contains a lubricant. Therefore, the slidability of the plate-like member 70 and the insertion hole 72 is further improved. Since the plate-like member 70 contains a lubricant, the fibers forming the cloth are not easily detached from the plate-like member 70. Therefore, the sewing machine motor 32 can suppress entry of foreign matter such as dust generated from the plate-like member 70 into the box-shaped body 120. The second protrusion 112 and the insertion hole 72 are in a press-fitted state. The foreign matter is unlikely to enter between the second protrusion 112 and the insertion hole 72. Therefore, the sewing machine motor 32 can further suppress entry of foreign matter into the box-shaped body 120.

  The fixing means 170 fixes the plate member 70 to the opening 122. When the sewing machine motor 32 is driven, the fixing means 170 restricts the rotation of the plate member 70. Therefore, when the sewing machine motor 32 is driven, the second protrusion 112 can slide stably with respect to the insertion hole 72. The fixing means 170 includes a protrusion 172 and an entry hole 175. An operator who assembles the sewing machine motor 32 can fix the plate-shaped member 70 to the box-shaped body 120 by closing the opening 122 with the plate-shaped member 70 so that the protrusion 172 enters the entry hole 175. Therefore, the sewing machine motor 32 can improve assemblability.

  The protruding wall portion 165 of the cylindrical body 160 is between the outer wall portion 152 of the rotating body 150 and the left end portion of the facing wall portion 154. Foreign matter is unlikely to enter the cylindrical body 160 from the outside in the radial direction. Therefore, the sewing machine motor 32 can further make it difficult for foreign matter to adhere to the disk 131.

  The connecting member 180 faces the extending wall portion 257 on the inner side in the radial direction. Since the connecting member 180 is inside the extending wall portion 257, the sewing machine motor 32 can further suppress foreign matters from entering the cylindrical body 160 from the radially outer side.

  In the above description, the sewing machine motor 32 is an example of the motor of the present invention. The right end surface 121A is an example of the other end surface of the box-shaped body of the present invention. The left side is an example of one side of the present invention. The right side is an example of the other side of the present invention. The left-right direction is an example of the extending direction of the present invention.

  The present invention is not limited to the above embodiment. The plate-like member 70 may be a plate formed in a polygonal shape such as a rectangular plate instead of the disc shape. The plate-like member 70 may be, for example, a cloth formed of a chemical fiber different from polyamide, or may be a cloth formed of animal hair such as wool. Instead of being a cloth, the plate-like member 70 may be, for example, a plate-like rubber or an oil seal. The plate member 70 having flexibility may contain a lubricant different from the fluorine-type thin film lubricant. The plate-like member 70 may not contain a lubricant. The plate-like member 70 may not have flexibility, and may be a metal plate that is difficult to bend, for example.

  The cylindrical body 160 may be, for example, a rectangular cylinder instead of being cylindrical. The shape of the end of the opening 122 on the radially outer side may be a polygonal shape instead of a circular shape. Even in this case, the opening 122 includes a circular hole 122A. If the shape of the plate-like member 70 in the right side view is substantially coincident with the shape of the end of the opening 122 on the radially outer side, the plate-like member 70 forms the opening 122 of the box-like body 120 between the output shaft 110. Block it. The number of each of the protrusions 172 and the entry holes 175 may be one, two, three, or five or more.

  The fixing means 170 may include a specific protrusion protruding inward in the radial direction from the inner peripheral surface of the opening 122 instead of the protrusion 172 protruding rightward from the opening 122. In this case, the fixing means 170 may include a specific entry hole in which the peripheral end of the plate-like member 70 is cut out toward the center instead of the entry hole 175 penetrating the plate-like member 70 in the thickness direction. The fixing means 170 can fix the plate-like member 70 to the opening 122 by the specific protrusion entering the specific entry hole.

  The sewing machine motor 32 may not include the fixing means 170. In this case, the plate-like member 70 rotates together with the output shaft 110 when the sewing machine motor 32 is driven. The outer diameter of the second protrusion 112 and the inner diameter of the insertion hole 72 may be substantially the same. Even in this case, the insertion hole 72 contacts the second protrusion 112 over the circumferential direction.

  The encoder 130 may detect either the rotation position or the rotation speed instead of detecting the rotation position and the rotation speed of the output shaft 110. The light-transmitting portion of the predetermined pattern of the encoder 130 may be a through-hole formed in the disk 131 instead of the part of the disk 131 having a light-transmitting color. The encoder 130 may include a reflective encoder instead of the transmissive encoder. In this case, both the light emitting unit 132 and the light receiving unit 133 are arranged on one side in the left-right direction with respect to the disk 131. The sewing machine motor 32 may be, for example, a pulse motor instead of being a DC motor. The sewing machine motor 32 may be a motor provided in a device different from the sewing machine 1.

  The sewing machine motor 32 may not include the connecting member 180. In this case, the rotating body 150 may include a connecting hole into which the second protruding portion 112 is press-fitted instead of being fixed to the second protruding portion 112 via the connecting member 180. Instead of protruding rightward from the housing 101, the connecting portion 201 may protrude leftward from the wall portion 121 of the box-shaped body 120, for example. In this case, the connecting portion 201 is indirectly connected to the housing 101 via the box-shaped body 120, and the fastening hole 202 of the connecting portion 201 opens to the left. In this case, the resin member 250 is provided on the left surface 92 of the substrate 90. The casing 101 may have a rectangular tube shape instead of a cylindrical shape.

32 sewing machine motor 70 plate-like member 72 insertion hole 101 housing 110 output shaft 111 first protrusion 112 second protrusion 112A part 112B other part 120 box-like body 122 opening 131 disk 132 light emitting part 133 light receiving part 135 reading part 150 Rotating body 152 Outer wall portion 154 Opposing wall portion 160 Tubular body 162 Tubular outer wall portion 165 Protruding wall portion 165A Tip portion 167 Extension wall portion 170 Fixing means 172 Protrusion 175 Entrance hole 180 Connecting member

Claims (9)

A housing,
An output shaft that is rotatably supported inside the housing and has a first projecting portion that projects from the housing to one side, and a second projecting portion that projects from the housing to the other side,
A box-shaped body that is provided in the housing, accommodates a part of the second projecting portion, and has an opening in which the other portion of the second projecting portion projects to the other side;
A disc having a predetermined pattern provided along the circumferential direction with respect to the output shaft provided in the part of the second protrusion;
A reading unit provided inside the box-like body, and having a light emitting unit that emits light to the pattern of the disc, and a light receiving unit that receives light emitted from the light emitting unit;
In a motor comprising: a rotating body provided at the other part of the second projecting part;
The opening has a plate shape with a thickness in the extending direction of the output shaft, and has an insertion hole through which the second protrusion is inserted, and the insertion hole extends in the circumferential direction. A motor comprising a plate-like member in contact with two projecting portions.   The motor according to claim 1, wherein the plate member has flexibility.   The motor according to claim 1, wherein the plate-like member is a cloth.   The motor according to claim 3, wherein the plate member includes a lubricant.   5. The motor according to claim 3, wherein the second projecting portion and the insertion hole of the plate-like member are in a press-fitted state.   The motor according to any one of claims 1 to 5, further comprising a fixing unit that fixes the plate-like member to the opening. The opening is a concave shape that is recessed from the other end surface of the box-shaped body toward the one side,
The fixing means includes
A protrusion provided on the opening and protruding to the other side;
The motor according to claim 6, further comprising an entry hole provided in the plate-like member and into which the protrusion enters. Provided in the housing, comprising a cylindrical body surrounding the box-shaped body over the circumferential direction,
The cylindrical body is
A cylindrical outer wall on the one side of the rotating body;
A projecting wall portion projecting from the cylindrical outer wall portion to the other side on the box-like body side from the cylindrical outer wall portion in the radial direction with respect to the output shaft;
The rotating body is
An outer wall portion facing from the outer side in the radial direction with respect to the distal end portion of the protruding wall portion;
The motor according to any one of claims 1 to 7, further comprising: an opposing wall portion facing the outer wall portion with the tip portion of the protruding wall portion interposed therebetween. A connecting member that is connected to the rotating body on the other side of the plate-like member and on the inner side of the cylindrical body, and that passes through the second projecting portion;
The cylindrical body includes an extended wall portion that protrudes inward in the radial direction from the protruding wall portion and extends in the circumferential direction,
The motor according to claim 8, wherein the connecting member faces the extending wall portion on the inner side in the radial direction.

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