Screw fastening tool

Abstract

The invention provides a screw fastening tool capable of improving visibility of a light-emitting part for notification. A screw fastening tool (1) is provided with: a motor (4); a tool holding part (12) that rotates by the rotational force generated by the motor (4); a cylindrical lens (77) disposed between the motor (4) and the tool holding part (12); and a light-emitting element (75) that is disposed radially outward of the cylindrical lens (77) and that irradiates light toward the cylindrical lens (77).

Description

Technical Field

[0001] The invention relates to a screw fastening tool. Background Art

[0002] In the technical field of screw fastening tools, there is known a screw fastening tool as disclosed in Japanese Patent Application Laid-Open No. 2020-044627 (hereinafter referred to as “Patent Document 1”). Summary of the invention

[0003] The screw fastening tool of Patent Document 1 has a notification light emitting portion. It is desired to improve the visibility of the notification light emitting portion.

[0004] An object of the present invention is to improve the visibility of a notification light emitting unit.

[0005] A first aspect of the present invention relates to a screw tightening tool comprising: a motor; a tool holding portion that rotates by the rotational force generated by the motor; a cylindrical lens that is arranged between the motor and the tool holding portion; and a light-emitting element that is arranged at a radially outer position than the cylindrical lens and irradiates light toward the cylindrical lens.

[0006] According to the present invention, the visibility of the notification light emitting section can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a perspective view of the electric working machine according to the first embodiment as seen from the upper left rear.

[0008] Figure 2 This is a perspective view of the electric working machine according to the first embodiment as viewed from the upper right front.

[0009] Figure 3 This is a diagram of the electric working machine according to the first embodiment as viewed from above.

[0010] Figure 4 This is a diagram of the electric working machine according to the first embodiment as viewed from below.

[0011] Figure 5 This is a diagram of the electric working machine according to the first embodiment as viewed from the front.

[0012] Figure 6 This is a diagram of the electric working machine according to the first embodiment as seen from the left.

[0013] Figure 7 It is a longitudinal sectional view of the electric working machine according to the first embodiment.

[0014] Figure 8 It is a longitudinal sectional view of the front part of the electric working machine according to the first embodiment.

[0015] Fig. 9 It is a transverse cross-sectional view of the front portion of the electric working machine according to the first embodiment.

[0016] Fig.10 This is an exploded perspective view of the front portion of the electric working machine according to the first embodiment as viewed from the upper left front.

[0017] Fig.11 This is an exploded perspective view of the front portion of the electric working machine according to the first embodiment as viewed from the upper left front.

[0018] Fig.12 This is an exploded perspective view of the illumination light emitting unit and the notification light emitting unit according to the first embodiment as viewed from the upper left rear.

[0019] Fig.13 This is an exploded perspective view of the illumination light emitting unit and the notification light emitting unit according to the first embodiment as viewed from the lower right front.

[0020] Fig.14 It is a longitudinal cross-sectional view of the light emitting section for illumination and the light emitting section for notification according to the first embodiment.

[0021] Fig.15 It is a transverse cross-sectional view of the light emitting section for illumination and the light emitting section for notification according to the first embodiment.

[0022] Fig.16 It is a longitudinal cross-sectional view of the light emitting unit for illumination according to the first embodiment.

[0023] Fig.17 It is a transverse cross-sectional view of the notification light emitting unit according to the first embodiment.

[0024] Fig.18 This is a transverse cross-sectional view in which a part of the notification light emitting unit of the first embodiment is enlarged.

[0025] Fig.19 This is a diagram of the substrate according to the first embodiment as viewed from above.

[0026] Fig. 20 This is a diagram of the substrate according to the first embodiment as viewed from below.

[0027] Fig.21 This is a diagram of the cylindrical lens according to the first embodiment as viewed from below.

[0028] Fig. 22 This is an exploded perspective view of the electric working machine according to the first embodiment as seen from the upper left rear.

[0029] Fig.23 This is an exploded perspective view of the electric working machine according to the first embodiment as seen from the upper left rear.

[0030] Fig.24 This is a transverse cross-sectional view in which a part of the notification light emitting section according to the second embodiment is enlarged.

[0031] Fig.25 This is a diagram of the substrate according to the third embodiment as viewed from the left.

[0032] Fig.26 This is a diagram showing the substrate of the fourth embodiment as viewed from the left.

[0033] Fig. 27 This is a diagram of the substrate according to the fifth embodiment as viewed from the left.

[0034] Fig.28 This is a diagram of the substrate according to the sixth embodiment as viewed from the left.

[0035] Fig.29 This is a diagram of the substrate of the seventh embodiment as viewed from the left.

[0036] Fig.30 This is a diagram of the substrate of the eighth embodiment as viewed from the left.

[0037] Fig.31 This is a perspective view of the electric working machine according to the ninth embodiment as viewed from the upper left rear.

[0038] Fig.32 This is a diagram of the electric working machine according to the ninth embodiment as viewed from the left.

[0039] Fig.33 It is a longitudinal sectional view of the electric working machine according to the ninth embodiment.

[0040] Fig.34 It is a longitudinal sectional view of the front part of the electric working machine according to the ninth embodiment.

[0041] Description of Reference Numerals

[0042] 1…Electric working machine; 1J…Electric working machine; 2…Main casing; 2A…Left half split casing; 2B…Right half split casing; 2J…Main casing; 3…Motor housing; 3J…Motor housing; 4…Motor; 4J…Motor; 5…Clutch housing; 5J…Clutch housing; 6…Clutch unit; 6J…Clutch unit; 7…Holding unit; 7J…Holding unit; 8…Battery assembly unit; 8J…Battery assembly unit; 9…Screw; 10…Front casing; 10J…Front casing; 11…Output unit; 12…Output shaft; 12J…Output shaft; 13…Battery pack; 13J…Battery pack; 14…Terminal block; 14J…Terminal block; 15…Controller; 15J…Controller; 16…Control circuit board; 17…Casing body; 18…trigger switch; 18J…trigger switch; 19…trigger shifter; 19J…trigger shifter; 20…forward / reverse switching button; 20J…forward / reverse switching button; 21…stator; 22…rotor; 23…stator core; 24…insulator; 25…coil; 26…rotor shaft; 26J…rotor shaft; 27…rotor core; 28…permanent magnet; 29…permanent magnet for sensor; 30…sensor circuit board; 31…screw; 32…terminal unit; 33…front wall; 34…rear rib; 35…bearing bracket; 36…bearing; 36J…bearing; 37…bearing; 37J…bearing; 38…centrifugal fan; 38J…centrifugal fan; 39…air inlet; 40…exhaust outlet; 41…pinion; 42…inner gear; 43…gear carrier; 44…planetary gear; 45…rear cam; 46…cam ball; 47…front cam; 48…main shaft; 48J…main shaft; 49…cam groove; 50…ball; 51…spring bracket; 52…coil spring; 53…speed reduction mechanism; 53J…speed reduction mechanism; 54…threaded portion; 55…bent cylinder; 56…threaded sleeve; 57…intermediate shaft; 58…bevel gear; 59…bearing; 60…bearing; 60J…bearing; 61…bevel gear; 62…sensor plate; 63…coil spring; 64…engaging piece; 65…magnet; 66…detection substrate; 67…detection element; 68…external connection terminal; 69…cover; 70…sound output element; 70J…sound output element; 71…light 72…light emitting portion for illumination (first light emitting portion); 72B…light emitting portion for notification (second light emitting portion); 73…light emitting element (first light emitting element); 74…transmission lens (first lens); 75…light emitting element (second light emitting element); 76…light diffusion lens; 77…cylindrical lens (second lens); 78…substrate; 78C…substrate; 78D…substrate; 78E…substrate; 78F…substrate; 78G…substrate; 78H…substrate; 79…substrate holder; 80…screw; 81…screw; 82…screw hole; 83…screw hole; 84…opening; 85…vibration element; 86…tool holding mechanism; 741…bend portion; 742…flat portion; 761…incident surface; 762…exit surface;763…incident groove; 764…emission groove; 771…incident portion; 772…through portion (recess); 772B…recess; 773…screw through hole; 781…screw through hole; 791…screw through hole; 792…screw through hole; 793…opening; α…angle; β…angle; Da…depth; Db…depth; La…size; Wa…size. ; DETAILED DESCRIPTION

[0043] Hereinafter, the embodiments involved will be described with reference to the drawings, but the present invention is not limited to the embodiments. The constituent elements of the embodiments described below may be combined as appropriate. In addition, some constituent elements may not be used.

[0044] In the embodiments, the terms front, rear, left, right, top, and bottom are used to describe the positional relationship of each part. The above terms represent relative positions or directions based on the center of the electric working machine. The left-right direction, the front-back direction, and the up-down direction are orthogonal.

[0045] In the embodiments, a direction parallel to the rotation axis AX of the motor is appropriately referred to as an axial direction, a direction radiating from the rotation axis AX of the motor is appropriately referred to as a radial direction, and a direction around the rotation axis AX of the motor is appropriately referred to as a circumferential direction or a rotation direction.

[0046] The position on one side of the axial direction or the direction on one side is appropriately referred to as the first axial direction. The position on the other side of the axial direction or the direction on the other side is appropriately referred to as the second axial direction. In the embodiment, the axial direction is parallel to the front-rear direction. The first axial direction is the front side, and the second axial direction is the rear side.

[0047] In the radial direction, a position closer to the motor's rotation axis AX or a direction close to the motor's rotation axis AX is appropriately referred to as the radial inside, and a position farther from the motor's rotation axis AX or a direction farther from the motor's rotation axis AX is appropriately referred to as the radial outside.

[0048] The position on one side of the circumferential direction or the direction on one side is appropriately referred to as a first circumferential direction. The position on the other side of the circumferential direction or the direction on the other side is appropriately referred to as a second circumferential direction.

[0049] [First embodiment]

[0050] <Electric working machine>

[0051] Figure 1 This is a perspective view of the electric working machine 1 according to the present embodiment as viewed from the upper left rear. Figure 2 It is a perspective view of the electric working machine 1 as viewed from the upper right front. Figure 3 This is a diagram showing the electric working machine 1 as viewed from above. Figure 4 This is a diagram showing the electric working machine 1 as viewed from below. Figure 5 This is a diagram showing the electric working machine 1 as viewed from the front. Figure 6 This is a diagram showing the electric working machine 1 as viewed from the left. Figure 7 It is a longitudinal sectional view of the electric working machine 1 . Figure 8 It is a longitudinal sectional view of the front portion of the electric working machine 1 . Fig. 9 It is a transverse cross-sectional view of the front portion of the electric working machine 1 . Fig. 9 Equivalent to Figure 8 A-A line section view.

[0052] The electric working machine 1 of the present embodiment is an angle screwdriver which is a type of screw-fastening tool.

[0053] The electric working machine 1 includes: a main body housing 2, a clutch housing 5, a front housing 10, a controller 15, an external connection terminal 68, a sound output element 70, a trigger shift 19, a forward and reverse switching button 20, a motor 4, a speed reduction mechanism part 53, a clutch part 6, a main shaft 48, an intermediate shaft 57, an output part 11, and a detection element 67.

[0054] The main body housing 2 is cylindrical and extends in the front-rear direction. The main body housing 2 includes a left half housing 2A and a right half housing 2B. The right half housing 2B is disposed on the left side of the left half housing 2A. The left half housing 2A and the right half housing 2B are fixed by a plurality of screws 9.

[0055] The main body housing 2 includes a motor housing portion 3, a grip portion 7, and a battery mounting portion 8. The grip portion 7 is disposed at the rear side of the motor housing portion 3. The battery mounting portion 8 is disposed at the rear side of the grip portion 7. The motor housing portion 3 houses the motor 4. The grip portion 7 is gripped by an operator. The battery mounting portion 8 holds the battery pack 13.

[0056] The clutch housing 5 has a cylindrical shape and is disposed on the front side of the main body housing 2. The clutch housing 5 accommodates the clutch unit 6. The clutch housing 5 is fixed to the front part of the main body housing 2 by a plurality of screws 31.

[0057] The front housing 10 is cylindrical and is arranged at the front side of the clutch housing 5. The front housing 10 is bent downward at the middle part of the front housing 10. The front housing 10 accommodates the output part 11. The front housing 10 is fixed to the front part of the clutch housing 5. The front housing 10 has a curved cylindrical part 55 and a threaded sleeve 56. The threaded sleeve 56 is arranged around the rear part of the curved cylindrical part 55. The front housing 10 is fixed to the front part of the clutch housing 5 by combining the threaded sleeve 56 with the threaded part 54 provided at the front part of the clutch housing 5.

[0058] The battery pack 13 is a power source of the electric working machine 1. The battery mounting portion 8 holds the terminal block 14. The terminal block 14 is electrically connected to the battery pack 13. The battery pack 13 is attached to and detached from the terminal block 14. The battery pack 13 is mounted on the terminal block 14 by sliding from the bottom to the top of the terminal block 14.

[0059] The controller 15 controls at least the motor 4. The controller 15 is housed in the battery mounting portion 8. The controller 15 includes a control circuit board 16 and a housing 17. Electronic components such as capacitors, a microcomputer, and a switching element are mounted on the control circuit board 16. The housing 17 houses the control circuit board 16.

[0060] The external connection terminal 68 is connected to an external device. The external connection terminal 68 is arranged above the terminal block 14. The external connection terminal 68 is, for example, a universal serial bus (USB) terminal. The external device is, for example, a personal computer. The personal computer changes the settings of the controller 15 via the external connection terminal 68. The external connection terminal 68 is covered by a cover 69.

[0061] The sound output element 70 outputs a notification sound. The sound output element 70 is, for example, a buzzer. The sound output element 70 is accommodated in the grip portion 7. The sound output element (notification element) 70 notifies at least the working state of the electric working machine 1.

[0062] The trigger paddle 19 protrudes downward from the lower portion of the front portion of the grip 7. The trigger paddle 19 is operated by the operator to drive the motor 4. The trigger paddle 19 is connected to the trigger switch 18. The trigger switch 18 is accommodated in the grip 7. When the trigger paddle 19 is operated to move upward, an operation signal for driving the motor 4 is sent from the trigger switch 18 to the controller 15.

[0063] The forward / reverse switching button 20 protrudes in the left-right direction from the front of the grip portion 7. The forward / reverse switching button 20 switches the rotation direction of the motor 4.

[0064] The motor 4 is a power source of the electric working machine 1. The motor 4 is an inner rotor type brushless motor. The motor 4 has a stator 21 and a rotor 22. The rotor 22 rotates relative to the stator 21. The rotor 22 rotates around a rotation axis AX extending in the front-rear direction.

[0065] The stator 21 includes a stator core 23, an insulator 24, a plurality of coils 25, and a terminal unit 32. The insulator 24 is fixed to the front and rear of the stator core 23. The plurality of coils 25 are wound around the stator core 23 via the insulator 24. The terminal unit 32 short-circuits the plurality of coils 25.

[0066] The rotor 22 includes a rotor shaft 26, a rotor core 27, a plurality of permanent magnets 28, and a plurality of sensor permanent magnets 29. The rotor core 27 is disposed around the rotor shaft 26. The plurality of permanent magnets 28 are fixed to the outer peripheral surface of the rotor core 27. The plurality of sensor permanent magnets 29 are fixed to the front end surface of the rotor core 27.

[0067] A sensor circuit board 30 is fixed to the front insulator 24. The sensor circuit board 30 supports a rotation detection element that detects the rotation of the rotor 22. The rotation detection element includes a magnetic sensor that detects the position of the sensor permanent magnet 29. The detection signal of the rotation detection element is sent to the controller 15. The controller 15 controls the drive current supplied to the motor 4 based on the detection signal of the rotation detection element.

[0068] The main body housing 2 has a front wall 33 and a rear rib 34 inside. The front wall 33 separates the motor housing portion 3 from the clutch housing 5. The rear rib 34 separates the motor housing portion 3 from the grip portion 7.

[0069] The rotor shaft 26 extends in the front-to-back direction. The front portion of the rotor shaft 26 is rotatably supported by a bearing 36. The rear portion of the rotor shaft 26 is rotatably supported by a bearing 37. The bearing 36 is held by a bearing bracket 35. The bearing bracket 35 is cylindrical and supported by the front wall 33. The bearing 37 is held by the central portion of the rear rib 34. A centrifugal fan 38 is fixed to a portion of the rotor shaft 26 between the stator 21 and the bearing 37. The centrifugal fan 38 rotates together with the rotor shaft 26. Accordingly, an airflow for cooling the motor 4 is generated. A plurality of air inlets 39 are formed in a portion of the motor housing portion 3 radially outside the stator 21. A plurality of air outlets 40 are formed in a portion of the motor housing portion 3 radially outside the centrifugal fan 38. The air outside the motor housing portion 3 flows into the inside of the motor housing portion 3 through the air inlet 39 due to the rotation of the centrifugal fan 38, and flows toward the air outlet 40 while contacting the motor 4. Accordingly, the motor 4 is cooled. The air having passed through the motor 4 flows out to the outside of the motor housing portion 3 through the exhaust port 40 .

[0070] The front end of the rotor shaft 26 is arranged forward of the bearing support 35. The bearing support 35 is arranged around the rotor shaft 26. A pinion gear 41 is fixed to the front end of the rotor shaft 26. The rotor shaft 26 is connected to the speed reduction mechanism 53 via the pinion gear 41.

[0071] The speed reduction mechanism 53 transmits the rotational force generated by the motor 4 to the main shaft 48. The speed reduction mechanism 53 reduces the rotational speed of the rotor shaft 26 and transmits it to the main shaft 48. The speed reduction mechanism 53 connects the rotor shaft 26 and the main shaft 48. The speed reduction mechanism 53 rotates the main shaft 48 at a rotational speed lower than the rotational speed of the rotor shaft 26. The speed reduction mechanism 53 has a planetary gear mechanism driven by the rotational force generated by the motor 4.

[0072] The speed reduction mechanism 53 is arranged between the motor 4 and the output unit 11 in the front-rear direction. The speed reduction mechanism 53 includes an internal gear 42, two-stage planetary gears 44, and a two-stage gear carrier 43. The two-stage planetary gears 44 are arranged inside the internal gear 42. The two-stage gear carrier 43 supports the planetary gears 44. The pinion 41 is coupled to the planetary gear 44 at the rear stage.

[0073] The clutch unit 6 is arranged between the motor 4 and the output unit 11 in the front-to-back direction. The clutch unit 6 is arranged between the speed reduction mechanism unit 53 and the output unit 11 in the front-to-back direction. The clutch unit 6 operates in a manner that changes between an engaged state and a released state. In the engaged state, the clutch unit 6 transmits the rotational force of the motor 4 transmitted via the speed reduction mechanism unit 53 to the output unit 11. In the released state, the clutch unit 6 cuts off the transmission of the rotational force of the motor 4 toward the output unit 11.

[0074] The clutch unit 6 includes a rear cam 45 and a front cam 47. The rear cam 45 rotates together with the gear frame 43 of the preceding stage. The front cam 47 is coupled to the rear cam 45 via a cam ball 46. The rear cam 45 and the front cam 47 rotate together in the rotation direction via the cam ball 46.

[0075] The main shaft 48 is connected to the speed reduction mechanism 53 via the clutch portion 6. The main shaft 48 has a cam groove 49. A ball 50 is arranged in the cam groove 49. The main shaft 48 is connected to the front cam 47 via the ball 50. The front cam 47 and the main shaft 48 rotate together in the rotation direction via the ball 50. The front cam 47 can move in the front-rear direction relative to the main shaft 48.

[0076] A spring bracket 51 is arranged around the front part of the main shaft 48. The spring bracket 51 is arranged in front of the front cam 47. A coil spring 52 is arranged between the spring bracket 51 and the front cam 47. The coil spring 52 urges the front cam 47 toward the rear. As a result, the front cam 47 is arranged in a retracted position engaged with the cam ball 46.

[0077] The output portion 11 includes an intermediate shaft 57 and an output shaft 12. The intermediate shaft 57 is connected to the front portion of the main shaft 48. A hexagonal columnar portion is provided at the rear end portion of the intermediate shaft 57. A hexagonal hole is provided at the front end portion of the main shaft 48. The hexagonal columnar portion of the intermediate shaft 57 is fitted into the hexagonal hole of the main shaft 48. The intermediate shaft 57 rotates together with the main shaft 48. The rear portion of the intermediate shaft 57 is accommodated in the clutch housing 5. The front portion of the intermediate shaft 57 is accommodated in the curved cylinder portion 55. A bevel gear 58 is provided at the front end portion of the intermediate shaft 57. The intermediate shaft 57 is rotatably supported by a bearing 59.

[0078] The output shaft 12 rotates around a rotation axis extending in the up-down direction. The output shaft 12 is supported by a bearing 60 in a rotatable manner. The lower end of the output shaft 12 protrudes downward from the front housing 10. The output shaft 12 has a bevel gear 61 at the upper end. The bevel gear 58 of the intermediate shaft 57 is coupled to the bevel gear 61 of the output shaft 12. When the main shaft 48 rotates and the intermediate shaft 57 rotates, the output shaft 12 rotates. The output shaft 12 rotates while holding a screwdriver bit as a tool. The output shaft (tool holding portion) 12 rotates by the rotational force generated by the motor 4.

[0079] In the engaged state, when the rear cam 45 is rotated together with the gear frame 43 of the preceding stage by the rotational force of the motor 4, the front cam 47 is rotated by the cam ball 46, and the main shaft 48 is rotated by the ball 50. Accordingly, the intermediate shaft 57 is rotated, and the output shaft 12 is rotated by the bevel gear 58 and the bevel gear 61.

[0080] During the screw tightening operation, the motor 4 is started to be driven while the clutch unit 6 is in the engaged state. During the screw tightening operation, when the load torque transmitted from the output shaft 12 to the main shaft 48 via the intermediate shaft 57 exceeds the set torque, the clutch unit 6 changes from the engaged state to the released state. The so-called load torque exceeds the set torque means that the screw is tightened to the screw tightening object with the target tightening force, so that the screw tightening operation can be performed well. The set torque is determined by the force applied to the front cam 47 toward the rear by the coil spring 52.

[0081] When the clutch unit 6 is in the released state, the front cam 47 moves forward by means of the ball 50 rolling in the cam groove 49, thereby releasing the engagement with the cam ball 46 and idling relative to the rear cam 45. Accordingly, the transmission of the rotational force of the motor 4 to the main shaft 48 is cut off, and the clutch unit 6 is in the released state.

[0082] That is, when the load torque transmitted from the output shaft 12 to the main shaft 48 is less than the set torque, the front cam 47 is arranged in the retracted position by the rearward biasing force of the coil spring 52. In this case, the clutch unit 6 is in the engaged state, and the rotational force of the motor 4 is transmitted to the main shaft 48. When the load torque transmitted from the output shaft 12 to the main shaft 48 exceeds the set torque, the front cam 47 overcomes the biasing force of the coil spring 52 and moves toward the forward position. In this case, the clutch unit 6 is in the released state, and the rotational force of the motor 4 is not transmitted to the main shaft 48.

[0083] The detection element 67 is supported on the detection substrate 66. The detection element 67 detects the release state of the clutch part 6. A sensor plate 62 is arranged below the clutch part 6. The sensor plate 62 holds the magnet 65. The sensor plate 62 can move in the front-back direction. The sensor plate 62 is urged toward the rear by the coil spring 63. The sensor plate 62 has a snap-fit ​​piece 64. The snap-fit ​​piece 64 protrudes upward from the front part of the sensor plate 62. The snap-fit ​​piece 64 is arranged in front of the front cam 47. When the clutch part 6 becomes the release state, the front cam 47 moves toward the forward position in a state of contact with the snap-fit ​​piece 64. Accordingly, the sensor plate 62 holding the magnet 65 moves forward together with the front cam 47.

[0084] The detection substrate 66 supporting the detection element 67 is arranged below the sensor plate 62. The detection element 67 has a magnetic sensor capable of detecting the movement of the magnet 65 held on the sensor plate 62. The magnetic sensor is, for example, a Hall IC. When the clutch part 6 is operated and the sensor plate 62 moves forward, the detection element 67 detects the change in the magnetic field of the magnet 65. The detection signal of the detection element 67 is sent to the controller 15.

[0085] <Light-emitting section for illumination and light-emitting section for notification>

[0086] The electric working machine 1 includes a lighting light emitting unit 71 and a notification light emitting unit 72. The lighting light emitting unit 71 emits at least lighting light for illuminating a screwdriver bit held on the output shaft 12. The notification light emitting unit 72 emits at least notification light for notifying the working state of the electric working machine 1. The working state of the electric working machine includes the operating state of the clutch unit 6. The working state of the electric working machine 1 includes the screw tightening working state.

[0087] The illumination light emitting section 71 emits light of one color. The illumination light emitted from the illumination light emitting section 71 is, for example, white light.

[0088] The notification light emitting unit 72 can emit light of multiple colors. The notification light emitted from the notification light emitting unit 72 includes at least one of green notification light, yellow notification light, and red notification light.

[0089] The lighting light emitting section 71 emits lighting light in conjunction with the trigger switch 18. The lighting light emitting section 71 emits lighting light in conjunction with the motor 4. When the trigger paddle 19 is operated to move upward so that the trigger switch 18 is turned on, the motor 4 is driven. When the operation of the trigger paddle 19 is released and the trigger switch 18 is turned off, the motor 4 stops. The lighting light emitting section 71 emits lighting light when the trigger switch 18 is turned on. The lighting light emitting section 71 does not emit lighting light when the trigger switch 18 is turned off. The lighting light emitting section 71 emits lighting light when the motor 4 is driven. The lighting light emitting section 71 does not emit lighting light when the motor 4 stops.

[0090] The notification light emitting section 72 emits notification light in conjunction with the clutch section 6. When the motor 4 is driven to perform the screw tightening operation and the clutch section 6 is in the engaged state, the notification light emitting section 72 does not emit notification light.

[0091] When the clutch part 6 changes from the engaged state to the released state while the motor 4 is driven to perform the screw tightening operation, the notification light emitting part 72 emits, for example, a green notification light. The clutch part 6 changes from the engaged state to the released state by moving the front cam 47 from the retracted position to the advanced position. Accordingly, the magnet 65 held by the front cam 47 moves forward. The detection element 67 detects the advancement of the magnet 65. When the detection element 67 detects that the magnet 65 moves forward, the controller 15 determines that the screw tightening operation state is good, and emits, for example, a green notification light from the notification light emitting part 72.

[0092] When the clutch unit 6 does not change from the engaged state to the released state while the motor 4 is driven to perform the screw tightening operation, the notification light emitting unit 72 emits, for example, a red notification light. For example, during the screw tightening operation, the operator may release the operation of the trigger shifter 19 before the screw is tightened to the screw tightening object with the target tightening force. If the motor 4 stops before the detection element 67 detects that the magnet 65 moves forward, the controller 15 determines that the screw tightening operation is not in good condition, and emits, for example, a red notification light from the notification light emitting unit 72.

[0093] In addition, the working state of the electric working machine 1 notified by the notification light emitting unit 72 is not limited to the operating state of the clutch unit 6 or the screw tightening working state. For example, the controller 15 can make the notification light emitting unit 72 flash a red notification light when the remaining capacity of the battery pack 13 is reduced. The controller 15 can also make the notification light emitting unit 72 alternately light a red notification light and a green notification light when the voltage input to the controller 15 is abnormal. The controller 15 can also make the notification light emitting unit 72 flash a red light when the temperature of the controller 15 is abnormal.

[0094] In addition, the sound output element (notification element) 70 at least outputs a notification sound for notifying the working state of the electric working machine 1. When the detection element 67 detects that the magnet 65 has moved forward, the controller 15 emits, for example, a green notification light from the notification light emitting unit 72, and outputs a first notification sound from the sound output element 70. When the detection element 67 detects that the motor 4 has stopped before the magnet 65 has moved forward, the controller 15 emits, for example, a red notification light from the notification light emitting unit 72, and outputs a second notification sound from the sound output element 70.

[0095] Furthermore, when, for example, the remaining capacity of the battery pack 13 decreases, the controller 15 may cause the notification light emitting unit 72 to flash a red notification light, and output a third notification sound from the sound output element 70. When an abnormality occurs in the voltage input to the controller 15, the controller 15 may cause the notification light emitting unit 72 to alternately light a red notification light and a green notification light, and output a fourth notification sound from the sound output element 70. When an abnormality occurs in the temperature of the controller 15, the controller 15 may cause the notification light emitting unit 72 to flash a red notification light, and output a fifth notification sound from the sound output element 70.

[0096] Fig.10 This is an exploded perspective view of the front portion of the electric working machine 1 as viewed from the upper left front. Fig.11 This is an exploded perspective view of the front portion of the electric working machine 1 as viewed from the upper left front. Fig.12 This is an exploded perspective view of the lighting light emitting unit 71 and the notification light emitting unit 72 as viewed from the upper left rear. Fig.13 This is an exploded perspective view of the lighting light emitting unit 71 and the notification light emitting unit 72 as viewed from the lower right front. Fig.14 It is a longitudinal cross-sectional view of the illumination light emitting section 71 and the notification light emitting section 72 . Fig.15 It is a transverse cross-sectional view of the illumination light emitting section 71 and the notification light emitting section 72 . Fig.15 Equivalent to Fig.14 Section view along the B-B line. Fig.16 It is a longitudinal cross-sectional view of the light emitting unit 71 for illumination. Fig.17 It is a transverse cross-sectional view of the notification light emitting unit 72 . Fig.18 It is a transverse cross-sectional view in which a part of the notification light emitting unit 72 is enlarged.

[0097] The illumination light emitting unit 71 includes a plurality of light emitting elements 73 (first light emitting elements) and a transmissive lens 74 (first lens). The notification light emitting unit 72 includes a plurality of light emitting elements 75 (second light emitting elements), a light diffusion lens 76, and a cylindrical lens 77 (second lens). The electric working machine 1 includes a substrate 78.

[0098] Fig.19 This is a diagram of the substrate 78 according to the present embodiment as viewed from above. Fig. 20 This is a diagram showing the substrate 78 as viewed from below.

[0099] The light emitting element 73 is disposed on the front surface (lower surface) of the substrate 78. The light emitting element 75 is disposed on the back surface (upper surface) of the substrate 78. A screw through hole 781 is provided at the rear portion of the substrate 78.

[0100] The light emitting element 73 is a light emitting diode (LED). A plurality of (two in this embodiment) light emitting elements 73 are arranged along the front-rear direction on the lower surface of the substrate 78 .

[0101] The transmission lens 74 transmits the light emitted from the light emitting element 73. The transmission lens 74 is arranged on the lower side of the substrate 78. The transmission lens 74 is opposite to the light emitting element 73. The transmission lens 74 has a curved portion 741 and a flat portion 742. The light emitting element 73 on the front side is opposite to the curved portion 741. The light emitting element 73 on the rear side is opposite to the flat portion 742. The curved portion 741 is bent toward the front and upward. The light emitted from the light emitting element 73 and transmitted through the curved portion 741 is irradiated to a position in front of the transmission lens 74. The light transmitted through the curved portion 741 is irradiated to the output shaft 12 or the screwdriver bit held on the output shaft 12. The light emitted from the light emitting element 73 and transmitted through the flat portion 742 is irradiated to the bottom of the transmission lens 74.

[0102] The light emitting element 75 is a light emitting diode (LED). A plurality of (three in this embodiment) light emitting elements 75 are arranged on the upper surface of the substrate 78 along the front-rear direction.

[0103] The light diffusion lens 76 and the cylindrical lens 77 are respectively arranged between the motor 4 and the output shaft 12 in the front-rear direction. The light diffusion lens 76 is arranged on the upper side of the substrate 78. The cylindrical lens 77 is arranged on the upper side of the light diffusion lens 76. The light diffusion lens 76 is arranged between the light emitting element 75 and the cylindrical lens 77 in the upper-lower direction.

[0104] The light diffusion lens 76 has an incident surface 761 and an emission surface 762. The incident surface 761 is opposite to the light emitting element 75. The emission surface 762 is opposite to the cylindrical lens 77. The incident surface 761 and the emission surface 762 are respectively substantially flat surfaces. The incident surface 761 and the emission surface 762 are substantially parallel. An incident groove 763 is provided on the incident surface 761. The incident groove 763 is recessed upward from the incident surface 761. An emission groove 764 is provided on the emission surface 762. The emission groove 764 is recessed downward from the emission surface 762. The incident groove 763 and the emission groove 764 are respectively longer in the front-to-back direction. In the front-to-back direction and the left-to-right direction, the position of the incident groove 763 and the position of the emission groove 764 are respectively consistent.

[0105] The incident groove 763 and the emission groove 764 each include a triangular groove. In a cross section orthogonal to the rotation axis AX, the angle α of the incident groove 763 is smaller than the angle β of the emission groove 764. As an example, the angle α is 90 degrees and the angle β is 115 degrees. In addition, the depth Da of the incident groove 763 is deeper than the depth Db of the emission groove 764. As an example, the depth Da is 0.5 mm and the depth Db is 0.3 mm.

[0106] The cylindrical lens 77 transmits light from the light emitting element 75. The cylindrical lens 77 surrounds the clutch housing 5. The cylindrical lens 77 is rotatably supported by the clutch housing 5. The cylindrical lens 77 is arranged such that the central axis of the cylindrical lens 77 coincides with the rotation axis AX of the motor 4. The central axis of the cylindrical lens 77 extends in the front-rear direction.

[0107] Fig.21 This is a diagram of the cylindrical lens 77 as viewed from below. The axial dimension La of the cylindrical lens 77 is smaller than the radial dimension Wa of the cylindrical lens 77 .

[0108] The cylindrical lens 77 has an incident portion 771 for light from the light emitting element 75 to be incident. A recessed portion 772 is provided in a portion of the cylindrical lens 77. The recessed portion 772 is recessed radially inward from the outer peripheral surface of the cylindrical lens 77. The recessed portion 772 is recessed upward from the lower portion of the outer peripheral surface of the cylindrical lens 77. The recessed portion 772 of the present embodiment is a through portion that penetrates the outer peripheral surface and the inner peripheral surface of the cylindrical lens 77. In the following description, the recessed portion 772 is appropriately referred to as the through portion 772.

[0109] The through-hole 772 is a through hole that penetrates the outer circumference and the inner circumference of the cylindrical lens 77. The through-hole 772 is long in a direction parallel to the central axis of the cylindrical lens. The incident portion 771 includes the inner surface of the through-hole 772. The cylindrical lens 77 has a screw through hole 773. The screw through hole 773 is formed at a position forward of the through-hole 772.

[0110] The light emitting element 75 is arranged at a position radially outward from the cylindrical lens 77. The light emitting element 75 irradiates light toward the cylindrical lens 77 via the light diffusion lens 76. The light emitted from the light emitting element 75 is incident on the incident groove 763 of the light diffusion lens 76. At least a portion of the light from the light emitting element 75 that is incident on the incident groove 763 is emitted from the emission groove 764 after passing through the light diffusion lens 76. The light emitted from the emission groove 764 is incident on the incident portion 771 of the cylindrical lens 77. At least a portion of the light that is incident on the incident portion 771 is emitted radially outward from the outer peripheral surface of the cylindrical lens 77 after propagating inside the cylindrical lens 77.

[0111] The electric working machine 1 includes a clutch unit 6, a clutch housing 5, and a substrate holder 79. The clutch unit 6 is disposed between the motor 4 and the output shaft 12 in the front-rear direction. The clutch housing 5 accommodates the clutch unit 6. The substrate holder 79 holds the substrate 78.

[0112] The substrate holder 79 holds the transmissive lens 74. The transmissive lens 74 is disposed on the lower side of the substrate 78. The substrate holder 79 has a screw through hole 791, a screw through hole 792, and an opening 793. The screw through hole 792 is disposed at a position further back than the screw through hole 791. The opening 793 is disposed at a position between the screw through hole 791 and the screw through hole 792 in the front-to-back direction. At least a portion of the substrate 78 is disposed at the opening 793. Light emitted from the light emitting element 73 is emitted from the opening 793 after passing through the transmissive lens 74.

[0113] The front portion of the substrate holder 79 is fixed to the clutch housing 5 by means of a screw 80. The cylindrical lens 77 is fixed to the clutch housing 5 by means of a screw 80. The screw 80 is inserted into the screw through hole 791 and the screw through hole 773, and then inserted into a screw hole 82 provided in the clutch housing 5. The screw 80 fastens the substrate holder 79, the cylindrical lens 77, and the clutch housing 5 together.

[0114] The rear portion of the substrate holder 79 is fixed to the clutch housing 5 by means of screws 81. The screws 81 are inserted into the screw through holes 792 and 781 and then inserted into screw holes 83 provided in the clutch housing 5. The screws 81 fasten the substrate holder 79, the substrate 78 and the clutch housing 5 together.

[0115] The substrate 78 is fixed to the clutch housing 5. The substrate holder 79 holding the substrate 78 is fixed to the clutch housing 5 by screws 80 and screws 81, thereby fixing the substrate 78 to the clutch housing 5. The substrate 78 is fixed to the clutch housing 5 by means of the substrate holder 79. The cylindrical lens 77 is fixed to the clutch housing 5. The cylindrical lens 77 is fixed to the clutch housing 5 by screws 80. The screws 80 fix the substrate holder 79 and the cylindrical lens 77 to the clutch housing 5.

[0116] Next, the operation of the electric working machine 1 will be described. With the screwdriver bit mounted on the output shaft 12 pressed against the screw, the operator moves the trigger lever 19 upward. When the trigger switch 18 is turned on, a driving current is supplied from the battery pack 13 to the motor 4 via the controller 15, thereby driving the motor 4. The controller 15 supplies a driving current to each of the plurality of coils 25 based on a detection signal sent from the rotation detection element of the sensor circuit substrate 30. Accordingly, the rotor 22 rotates.

[0117] When the rotor shaft 26 rotates due to the rotation of the rotor 22, the rotational force of the rotor shaft 26 is transmitted to the main shaft 48 via the speed reduction mechanism 53. When the load torque transmitted from the output shaft 12 to the main shaft 48 is less than the set torque, the clutch unit 6 is in the engaged state. Accordingly, the rotational force of the rotor shaft 26 is transmitted to the main shaft 48 via the speed reduction mechanism 53 and the clutch unit 6, thereby rotating the main shaft 48. Accordingly, the intermediate shaft 57 and the output shaft 12 rotate, causing the screwdriver bit to rotate, so that the screw tightening operation can be performed.

[0118] When the trigger switch 18 is turned on, the controller 15 emits illumination light from the illumination light emitting unit 71. In addition, the centrifugal fan 38 rotates together with the rotor shaft 26 due to the rotation of the rotor shaft 26. The rotation of the centrifugal fan 38 causes air to flow into the motor housing portion 3 from the air inlet 39, cool the motor 4, and then be discharged from the exhaust port 40.

[0119] When the screw is tightened to the object to be tightened with the target tightening force, and the load torque transmitted from the output shaft 12 to the main shaft 48 exceeds the set torque, the front cam 47 advances and the clutch portion 6 is released. The rotation of the output shaft 12 is stopped.

[0120] When the clutch portion 6 is in the released state, the sensor plate 62 holding the magnet 65 moves forward together with the front cam 47. The detection element 67 detects the advancement of the magnet 65. In this case, the controller 15 determines that the screw tightening operation state is good based on the detection signal of the detection element 67, and emits a green notification light from the notification light emitting portion 72. When the motor 4 stops before the detection element 67 detects that the magnet 65 moves forward, the controller 15 determines that the screw tightening operation state is bad, and emits a red notification light from the notification light emitting portion 72.

[0121] In addition, when the detection element 67 detects that the magnet 65 has advanced, the controller 15 emits a green notification light from the notification light emitting unit 72 and outputs a first notification sound from the sound output element 70. When the motor 4 stops before the detection element 67 detects that the magnet 65 has advanced, the controller 15 emits, for example, a red notification light from the notification light emitting unit 72 and outputs a second notification sound from the sound output element 70.

[0122] <Clutch adjustment>

[0123] Fig. 22 as well as Fig.23 Each of them is an exploded perspective view of the electric working machine 1 according to the present embodiment as seen from the upper left rear.

[0124] like Fig. 22 As shown, an opening 84 is provided in a part of the clutch housing 5. A jig for adjusting the clutch portion 6 can be inserted into the opening 84. The opening 84 is provided in the upper part of the clutch housing 5. The cylindrical lens 77 can rotate around the clutch housing 5 in a manner that changes between a state in which the opening 84 is covered and a state in which the opening 84 is not covered.

[0125] like Figures 1 to 8 As shown, when performing screw tightening work, for example, the cylindrical lens 77 is fixed to the clutch housing 5 by screws 80 and 81 while the opening 84 is covered by the cylindrical lens 77. This can prevent foreign matter from entering the clutch housing 5 from the outside.

[0126] like Fig.23 As shown, when the jig for adjusting the clutch portion 6 is inserted into the opening 84, the position of the cylindrical lens 77 in the rotation direction is adjusted so as not to cover the opening 84. The position of the cylindrical lens 77 in the rotation direction is adjusted so that the through portion 772 is aligned with the opening 84. The operator can insert the jig into the interior of the clutch housing 5 through the opening 84 to adjust the clutch portion 6.

[0127] The electric working machine 1 of this embodiment may have a motor 4; an output shaft 12 as a tool holding portion, which rotates by the rotational force generated by the motor 4; a cylindrical lens 77, which is arranged between the motor 4 and the output shaft 12; and a light-emitting element 75, which is arranged at a radially outer position than the cylindrical lens 77 and irradiates light toward the cylindrical lens 77.

[0128] In the above-described configuration, since the notification light is emitted from the cylindrical lens 77 , the visibility of the notification light emitting section 72 is improved.

[0129] The cylindrical lens 77 of this embodiment may be arranged so that the central axis of the cylindrical lens 77 coincides with the rotation axis AX of the motor 4 .

[0130] This improves the visibility of the notification light emitting unit 72 .

[0131] In the present embodiment, the axial dimension of the cylindrical lens 77 may be smaller than the radial dimension of the cylindrical lens 77 .

[0132] This can suppress the axial dimension of the electric working machine 1 from increasing.

[0133] Light emitted from the light emitting element 75 is incident on the inner surface of the penetration portion 772 .

[0134] In this embodiment, the plurality of light emitting elements 75 may be arranged in a direction parallel to the central axis of the cylindrical lens 77 .

[0135] This can suppress the occurrence of unevenness in the light emitted from the cylindrical lens 77 in the axial direction.

[0136] In this embodiment, a through portion 772 penetrating the outer circumference and inner circumference of the cylindrical lens 77 may be provided in a part of the cylindrical lens 77 , and light from the light emitting element 75 may be incident on the inner surface of the through portion 772 .

[0137] As a result, light emitted from the light emitting element 75 is incident on the inner surface of the penetration portion 772 .

[0138] In the present embodiment, at least a portion of the light incident on the inner surface of the penetration portion 772 may propagate inside the cylindrical lens 77 and then be emitted radially outward from the outer peripheral surface of the cylindrical lens 77 .

[0139] Since the light emitted from the light emitting element 75 is incident on the inner surface of the penetration portion 772 of the cylindrical lens 77 and then emitted from the outer peripheral surface of the cylindrical lens 77, the visibility of the notification light emitting portion 72 is improved.

[0140] The electric working machine 1 of the present embodiment may include a light diffusion lens 76 disposed between the light emitting element 75 and the cylindrical lens 77 .

[0141] As a result, the light diffused by the light diffusion lens 76 enters the cylindrical lens 77 .

[0142] The light diffusion lens 76 of this embodiment may include an incident groove 763 provided on an incident surface 761 opposite to the light emitting element 75, and an emission groove 764 provided on an emission surface 762 opposite to the cylindrical lens 77. At least a portion of the light incident on the incident groove 763 from the light emitting element 75 may be emitted from the emission groove 764 and then incident on the cylindrical lens 77 again.

[0143] As a result, the light diffused by the light diffusion lens 76 enters the cylindrical lens 77 .

[0144] In the present embodiment, the incident groove portion 763 and the emission groove portion 764 may each be elongated in a direction parallel to the central axis of the cylindrical lens 77 .

[0145] As a result, the light diffused by the light diffusion lens 76 enters the cylindrical lens 77 .

[0146] In this embodiment, the incident groove 763 and the emission groove 764 may each include a triangular groove. In a cross section perpendicular to the central axis, the angle β of the incident groove 763 may be smaller than the angle α of the emission groove 764 .

[0147] As a result, the light diffused by the light diffusion lens 76 enters the cylindrical lens 77 .

[0148] In this embodiment, the depth Da of the incident groove portion 763 may be deeper than the depth Db of the emission groove portion 764 .

[0149] As a result, the light diffused by the light diffusion lens 76 enters the cylindrical lens 77 .

[0150] The electric working machine 1 of the present embodiment may include a clutch unit 6 disposed between the motor 4 and the output shaft 12 and a clutch housing 5 that accommodates the clutch unit 6. The cylindrical lens 77 may be disposed so as to surround the clutch housing 5.

[0151] This improves the visibility of the notification light emitting unit 72 .

[0152] The cylindrical lens 77 of the present embodiment may be rotatably supported by the clutch housing 5 .

[0153] Thereby, the cylindrical lens 77 can be rotated.

[0154] In this embodiment, an opening 84 into which a jig for adjusting the clutch portion 6 can be inserted may be provided in a portion of the clutch housing 5. The cylindrical lens 77 may be configured to rotate between a state in which the opening 84 is covered and a state in which the opening 84 is not covered.

[0155] According to this, the cylindrical lens 77 is used as a cover that covers the opening 84 .

[0156] The electric working machine 1 of the present embodiment may include screws 80 for fixing the cylindrical lens 77 to the clutch housing 5 in a state where the opening 84 is covered by the cylindrical lens 77 .

[0157] According to this, the cylindrical lens 77 is used as a cover that covers the opening 84 .

[0158] The electric working machine 1 of the present embodiment may include a substrate 78 that supports the light emitting element 75 and a substrate holder 79 that holds the substrate 78. The substrate holder 79 and the cylindrical lens 77 may be fixed to the clutch housing 5 by screws 80.

[0159] According to this, the substrate holder 79 and the cylindrical lens 77 can be fixed to the clutch housing 5 by the screws 80 .

[0160] The electric working machine 1 of this embodiment may include: a motor 4; an output shaft 12 as a tool holding portion, which is rotated by the rotational force generated by the motor 4; a light emitting portion for illumination (first light emitting portion) 71, which includes a light emitting element (first light emitting element) 73; a light emitting portion for notification (second light emitting portion) 72, which includes a light emitting element (second light emitting element) 75; and a substrate 78. The light emitting element 73 may be disposed on the surface of the substrate 78, and the light emitting element 75 may be disposed on the back surface of the substrate 78.

[0161] Since the light emitting element 73 is arranged on the front surface of the substrate 78 and the light emitting element 75 is arranged on the back surface of the substrate 78 , the electric working machine 1 can be made compact.

[0162] The illumination light emitting unit 71 of the present embodiment can emit at least illumination light for illuminating a tool held by the output shaft 12 .

[0163] According to this, the tool can be illuminated by the illumination light.

[0164] The notification light emitting unit 72 of the present embodiment can emit at least notification light for notifying the working status.

[0165] According to this, the working state of the electric working machine 1 can be notified by the notification light.

[0166] The electric working machine 1 of the present embodiment may include a clutch unit 6 disposed between the motor 4 and the output shaft 12 and a clutch housing 5 that accommodates the clutch unit 6. The base plate 78 may be fixed to the clutch housing 5.

[0167] According to this, the electric working machine 1 can be made compact.

[0168] The electric working machine 1 of the present embodiment may include a substrate holder 79 that holds the substrate 78 and screws 81 that fix the substrate holder 79 to the clutch housing 5. The substrate 78 may be fixed to the clutch housing 5 via the substrate holder 79.

[0169] According to this, the electric working machine 1 can be made compact.

[0170] The lighting light emitting unit 71 of the present embodiment may include a first lens, that is, a transmissive lens 74 that transmits light from the light emitting element 73 . The transmissive lens 74 may be held by a substrate holder 79 .

[0171] According to this, the electric working machine 1 can be made compact.

[0172] In the present embodiment, the plurality of light emitting elements 73 may be arranged in a direction parallel to the rotation axis AX of the motor 4 .

[0173] This can suppress the occurrence of unevenness in the light emitted from the transmission lens 74 in the axial direction.

[0174] The electric working machine 1 of this embodiment may include a clutch unit 6 disposed between the motor 4 and the output shaft 12, and a clutch housing 5 that accommodates the clutch unit 6. The notification light emitting unit 72 may include a second lens, that is, a cylindrical lens 77, through which light from the light emitting element 75 passes. The cylindrical lens 77 may be cylindrical and disposed to surround the clutch housing 5.

[0175] This improves the visibility of the notification light emitting unit 72.

[0176] The electric working machine 1 of the present embodiment may include screws 80 for fixing the cylindrical lens 77 to the clutch housing 5 .

[0177] Thereby, the cylindrical lens 77 is fixed.

[0178] The electric working machine 1 of the present embodiment may include a substrate holder 79 that holds the substrate 78 . The substrate holder 79 and the cylindrical lens 77 may be fixed to the clutch housing 5 by screws 80 .

[0179] Thereby, the substrate holder 79 and the cylindrical lens 77 are fixed.

[0180] In the present embodiment, the plurality of light emitting elements 75 may be arranged in a direction parallel to the rotation axis AX of the motor 4 .

[0181] This can suppress the occurrence of unevenness in the light emitted from the cylindrical lens 77 in the axial direction.

[0182] [Second embodiment]

[0183] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0184] Fig.24 FIG. 1 is a cross-sectional view of a part of the notification light emitting unit 72B of the present embodiment, which is enlarged. In the above embodiment, the recessed portion 772 provided in the cylindrical lens 77 includes a through portion. Fig.24 As shown, the concave portion 772B only needs to be recessed upward from the lower portion of the outer peripheral surface of the cylindrical lens 77, and does not need to penetrate the outer peripheral surface and the inner peripheral surface of the cylindrical lens 77. It is sufficient that the inner surface of the concave portion 772 is provided for the light from the light emitting element 75 to enter.

[0185] [Third embodiment]

[0186] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0187] Fig.25 78C of the present embodiment is viewed from the left. In the above embodiment, the detection element 67 for detecting the release state of the clutch portion 6 is arranged on a detection substrate 66 different from the substrate 78. Fig.25 As shown in FIG. 1 , the detection element 67 can be disposed on a substrate 78C on which the light emitting element 73 is disposed. Fig.25 In the example shown, the light emitting element 73 is arranged on the lower surface (front surface) of the substrate 78C. The detection element 67 is arranged on the upper surface (back surface) of the substrate 78C. The detection element 67 is arranged at the same position as at least a part of the magnet 65 arranged in the retracted position in the front-back direction. Fig.25 As shown in FIG. 1 , the light emitting element 75 may be disposed on the upper surface of the substrate 78C. The detection element 67 is disposed at a position behind the light emitting element 75 .

[0188] In the above embodiment, the detection object part of the detection element 67 is the clutch part 6. Specifically, the detection object part of the detection element 67 is the magnet 65 that moves synchronously with the front cam 47 of the clutch part 6. In addition, the detection element 67 is a magnetic sensor such as a Hall IC that can detect the movement of the magnet 65. The detection element 67 can be a photointerrupter. The photointerrupter can detect the movement of the sensor plate 62, for example.

[0189] [Fourth embodiment]

[0190] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0191] Fig.26 This is a diagram of the substrate 78D of this embodiment as viewed from the left. Fig.26 As shown in FIG. 1 , the sound output element (notification element) 70 may be disposed on the substrate 78D on which the light emitting element 73 is disposed. Fig.26 In the example shown, the light emitting element 73 is arranged on the lower surface (front surface) of the substrate 78D. The sound output element 70 is arranged on the upper surface (back surface) of the substrate 78D. Fig.26 In the example shown, the light emitting element 75 is arranged on the upper surface of the substrate 78D together with the sound output element 70. The light emitting element (notification element) 75 emits notification light. In addition, the light emitting element 73 may be omitted from the substrate 78D. The light emitting element 75 may be arranged on the upper surface of the substrate 78D, and the sound output element 70 may be arranged on the lower surface of the substrate 78D.

[0192] [Fifth embodiment]

[0193] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0194] Fig. 27 This is a diagram of the substrate 78E of this embodiment as viewed from the left. Fig. 27 As shown in FIG. 1 , a vibration element (notification element) 85 may be disposed on the substrate 78E on which the light emitting element 73 is disposed. The vibration element 85 generates notification vibration. The vibration element 85 is, for example, a piezoelectric element. Fig. 27 In the example shown, the light emitting element 73 is arranged on the lower surface (front surface) of the substrate 78E. The vibration element 85 is arranged on the upper surface (back surface) of the substrate 78E. Fig. 27In the example shown, the light emitting element 75 is arranged on the upper surface of the substrate 78E together with the vibration element 85. The light emitting element (notification element) 75 emits notification light. In addition, the light emitting element 73 can be omitted from the substrate 78E. It is also possible to arrange the light emitting element 75 on the upper surface of the substrate 78E and arrange the vibration element 85 on the lower surface of the substrate 78E.

[0195] [Sixth embodiment]

[0196] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0197] Fig.28 This is a diagram of the substrate 78F of this embodiment as viewed from the left. Fig.28 As shown in FIG. 1 , the external connection terminal 68 may be disposed on the substrate 78F on which the light emitting element 73 is disposed. The external connection terminal 68 is connected to an external device. The external connection terminal 68 is, for example, a universal serial bus (USB) terminal. Fig.28 In the example shown, the light emitting element 73 is arranged on the lower surface (front surface) of the substrate 78F. The external connection terminal 68 is arranged on the upper surface (back surface) of the substrate 78F. Fig.28 In the example shown, the light emitting element 75 is arranged on the upper surface of the substrate 78F together with the external connection terminal 68. In addition, the light emitting element 73 may be omitted from the substrate 78F. Alternatively, the light emitting element 75 may be arranged on the upper surface of the substrate 78F, and the external connection terminal 68 may be arranged on the lower surface of the substrate 78F.

[0198] In addition, the external connection terminal 68 is not limited to a USB terminal, and the external connection terminal 68 may be a communication terminal that enables wireless communication with an external device.

[0199] [Seventh embodiment]

[0200] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0201] Fig.29 This is a diagram of the substrate 78G of this embodiment as viewed from the left. Fig.29 As shown in FIG. 7 , the detection element 67 and the external connection terminal 68 can be arranged on one substrate 78G. Fig.29In the example shown, the detection element 67 is arranged on the upper surface of the substrate 78G. The external connection terminal 68 is arranged on the upper surface of the substrate 78G. In addition, one or both of the light emitting element 73 and the light emitting element 75 described in the above embodiment may be arranged on the substrate 78G.

[0202] [Eighth embodiment]

[0203] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0204] Fig.30 This is a diagram of the substrate 78H of this embodiment as viewed from the left. Fig.30 As shown in FIG. 7 , the detection element 67, the external connection terminal 68, and the sound output element (notification element) 70 can be arranged on one substrate 78H. Fig.30 In the example shown, the detection element 67 is arranged on the upper surface of the substrate 78H. The external connection terminal 68 and the sound output element 70 are arranged on the upper surface of the substrate 78H. In addition, the vibration element 85 can be arranged on the substrate 78H instead of the sound output element 70 or together with the sound output element 70. One or both of the light emitting element 73 and the light emitting element 75 described in the above embodiment can also be arranged on the substrate 78H.

[0205] [Ninth embodiment]

[0206] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components is simplified or omitted.

[0207] Fig.31 This is a perspective view of the electric working machine 1J according to the present embodiment as viewed from the upper left rear. Fig.32 This is a diagram of the electric working machine 1J as seen from the left. Fig.33 It is a longitudinal sectional view of the electric working machine 1J. Fig.34 It is a longitudinal sectional view of the front part of the electric working machine 1J.

[0208] In the above embodiment, the electric working machine 1 is an angle screwdriver. Figure 31 to Figure 34 As shown, the electric working machine 1J may be a gun-type screwdriver. In the electric working machine 1J, the rotation axis AX of the motor 4J coincides with the rotation axis of the output shaft 12J.

[0209] The electric working machine 1 includes: a main body housing 2J, a clutch housing 5J, a front housing 10J, a controller 15J, a sound output element 70J, a trigger shift 19J, a forward / reverse switching button 20J, a motor 4J, a speed reduction mechanism part 53J, a clutch part 6J, a main shaft 48J, an output shaft 12J, and a tool holding mechanism 86.

[0210] The main body case 2J has a motor housing portion 3J, a grip portion 7J, and a battery mounting portion 8J. The grip portion 7J is disposed below the motor housing portion 3J. The battery mounting portion 8J is disposed below the grip portion 7J.

[0211] The clutch housing 5J has a cylindrical shape and is disposed on the front side of the motor housing portion 3J. The clutch housing 5J houses the clutch portion 6J.

[0212] The front housing 10J has a cylindrical shape and is disposed on the front side of the clutch housing 5J. The front housing 10J accommodates at least a portion of the output shaft 12J.

[0213] The battery pack 13J is a power source for the electric working machine 1J. The battery mounting portion 8J holds a terminal block 14J electrically connected to the battery pack 13J.

[0214] The controller 15J controls at least the motor 4J. The controller 15J is accommodated in the battery mounting portion 8J.

[0215] The trigger paddle 19J protrudes forward from the upper portion of the front portion of the grip 7J. The trigger paddle 19J is connected to the trigger switch 18J.

[0216] The forward / reverse switching button 20J protrudes from the upper portion of the grip portion 7 in the left-right direction.

[0217] The motor 4J is a power source of the electric working machine 1J. The motor 4J is an inner rotor type brushless motor.

[0218] The rotor shaft 26J extends in the front-to-back direction. The front portion of the rotor shaft 26J is rotatably supported by a bearing 36J. The rear portion of the rotor shaft 26J is rotatably supported by a bearing 37J. A centrifugal fan 38J is fixed to the rear portion of the rotor shaft 26J. The front end portion of the rotor shaft 26J is coupled to the speed reduction mechanism portion 53J.

[0219] The clutch unit 6J operates in a manner that changes between an engaged state and a released state. In the engaged state, the clutch unit 6J transmits the rotational force of the motor 4J transmitted via the speed reduction mechanism unit 53J to the output shaft 12J. In the released state, the clutch unit 6J cuts off the transmission of the rotational force of the motor 4J to the output shaft 12.

[0220] The output shaft 12J rotates around a rotation axis extending in the front-rear direction. The output shaft 12J is supported by the bearing 60J in a rotatable manner. The front end of the output shaft 12 protrudes forward from the front housing 10J. The output shaft 12J has a tool hole extending backward from the front end of the output shaft 12J. The tool holding mechanism 86 holds the screwdriver bit inserted into the tool hole.

[0221] Similar to the electric working machine 1 described in the above embodiment, the electric working machine 1J includes a light emitting unit 71 for illumination and a light emitting unit 72 for notification.

[0222] [Other embodiments]

[0223] In the above embodiment, the electric working machine is a screwdriver as a kind of electric tool. The electric working machine may be at least one of a driving drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a circular saw, and a reciprocating saw as a kind of electric tool. In addition, the electric working machine may also be a gardening tool (Outdoor Power Equipment). Gardening tools are, for example, a chain saw, a hedge trimmer, a lawn mower, a lawn mower, and a blower.

[0224] In the above-mentioned embodiment, the power source of the electric working machine may not be a battery pack, but may be a commercial power source (AC power source).

Claims

1. A screw tightening tool (1), comprising: Motor (4); a tool holding portion (12) which is rotated by the rotational force generated by the motor (4); a cylindrical lens (77) disposed between the motor (4) and the tool holding portion (12); and The light emitting element (75) is arranged radially outward from the cylindrical lens (77) and irradiates light toward the cylindrical lens (77).

2. The screw tightening tool (1) according to claim 1, wherein: The cylindrical lens (77) is configured such that a central axis of the cylindrical lens (77) coincides with a rotation axis (AX) of the motor (4).

3. The screw tightening tool (1) according to claim 1 or 2, wherein: The axial dimension of the cylindrical lens (77) is smaller than the radial dimension of the cylindrical lens (77).

4. The screw tightening tool (1) according to any one of claims 1 to 3, wherein: The cylindrical lens (77) has an incident portion (771) for incident light from the light emitting element (75), At least a portion of the light incident on the incident portion (771) propagates inside the cylindrical lens (77) and then is emitted radially outward from the outer peripheral surface of the cylindrical lens (77).

5. The screw tightening tool (1) according to claim 4, wherein: The cylindrical lens (77) has a recess (772) recessed radially inward from the outer peripheral surface of the cylindrical lens (77). The incident portion (771) includes an inner surface of the recessed portion (772).

6. The screw tightening tool (1) according to claim 5, wherein: The recessed portion (772) includes a through portion (772) that penetrates the outer peripheral surface and the inner peripheral surface of the cylindrical lens (77).

7. The screw tightening tool (1) according to claim 6, wherein: The through portion (772) is longer in a direction parallel to the central axis of the cylindrical lens (77).

8. The screw tightening tool (1) according to claim 1, wherein: The screw-tightening tool (1) includes: a plurality of light-emitting elements (75) arranged in a direction parallel to the central axis of the cylindrical lens (77).

9. The screw tightening tool (1) according to claim 8, wherein: The cylindrical lens (77) has a through portion (772) penetrating the outer peripheral surface and the inner peripheral surface of the cylindrical lens (77). Light from the light emitting element (75) is incident on the inner surface of the through portion (772).

10. The screw tightening tool (1) according to claim 9, wherein: At least a portion of the light incident on the inner surface of the through portion (772) propagates inside the cylindrical lens (77) and then is emitted radially outward from the outer peripheral surface of the cylindrical lens (77).

11. The screw tightening tool (1) according to any one of claims 1 to 10, wherein: The screw-tightening tool (1) further includes a light diffusion lens (76) disposed between the light-emitting element (75) and the cylindrical lens (77).

12. The screw-fastening tool (1) according to claim 11, wherein: The light diffusion lens (76) comprises: an incident groove portion (763) provided on an incident surface (761) opposite to the light emitting element (75); and an emission groove portion (764) provided on an emission surface (762) opposite to the cylindrical lens (77). At least a portion of the light incident on the incident groove portion (763) from the light emitting element (75) is incident on the cylindrical lens (77) again after being emitted from the emission groove portion (764).

13. The screw tightening tool (1) according to claim 12, wherein: The incident groove portion (763) and the emission groove portion (764) are respectively longer in a direction parallel to the central axis of the cylindrical lens (77).

14. The screw-fastening tool (1) according to claim 13, wherein: The incident groove portion (763) and the emission groove portion (764) respectively include triangular grooves, In a cross section perpendicular to the central axis, an angle (β) of the incident groove portion (763) is smaller than an angle (α) of the emission groove portion (764).

15. The screw tightening tool (1) according to claim 13 or 14, wherein: The depth (Da) of the incident groove portion (763) is deeper than the depth (Db) of the emission groove portion (764).

16. The screw tightening tool (1) according to any one of claims 1 to 15, wherein: The screw fastening tool (1) further comprises: a clutch portion (6) disposed between the motor (4) and the tool holding portion (12); and a clutch housing (5) for accommodating the clutch portion (6). The cylindrical lens (77) is configured to surround the clutch housing (5).

17. The screw-fastening tool (1) according to claim 16, wherein: The cylindrical lens (77) is rotatably supported by the clutch housing (5).

18. The screw-fastening tool (1) according to claim 17, wherein: The clutch housing (5) has an opening (84) into which a jig for adjusting the clutch portion (6) can be inserted. The cylindrical lens (77) is rotatable in a manner that allows the opening (84) to be covered and the opening (84) to be not covered.

19. The screw-fastening tool (1) according to claim 18, wherein: The screw-tightening tool (1) further includes a screw (80) for fixing the cylindrical lens (77) to the clutch housing (5) in a state where the opening (84) is covered by the cylindrical lens (77).

20. The screw-fastening tool (1) according to claim 19, wherein: The screw-tightening tool (1) further comprises: a substrate (78) for supporting the light-emitting element (75); and a substrate holder (79) for holding the substrate (78). The screw (80) fixes the substrate support (79) and the cylindrical lens (77) to the clutch housing (5).

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