Electric working machinery

Abstract

The present invention can suppress the performance deviation of an electric working machine. The electric working machine may include an electric unit, a control unit for controlling the electric unit, an operating member that can be moved to a first position and is operated by an operator, a first switch that is operated by the operating member while the operating member is moved to the first position, and a second switch that is operated by the operating member while the operating member is moved to the first position. Alternatively, the second position and the third position are located within the period during which the operating member is moved to the first position. When the operating member moves between the second position and the first position, the first switch sends a first signal that changes as the operating member moves from the second position toward the first position to the control unit. When the operating member moves toward the first position and exceeds the third position, the second switch sends a second signal to the control unit. The control unit controls the electric unit based on the first signal and the second signal.

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electric working machine. Background Art

[0002] Patent document 1 discloses an electric working machine. The electric working machine has an electric unit, a control unit that controls the electric unit, an operating member that is operated by an operator and can be moved to a first position, and a switch that is operated by the operating member while the operating member is moved to the first position. The switching position is located within the period during which the operating member moves to the first position. When the operating member moves to the switching position, the switch sends a first signal that changes as the operating member moves toward the switching position to the control unit, and sends a second signal when the operating member exceeds the switching position. The control unit controls the rotation speed of the electric unit based on the first signal and the second signal.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: European Patent Application Publication No. 2910339 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In the above structure, one switch sends different types of signals to the control unit according to the position of the operating member. Such a switch is prone to deviation in the switching position due to manufacturing errors, and the timing when the switch stops sending the first signal to the control unit and starts sending the second signal will vary in each electric working machine. As a result, the performance of the electric working machine varies. In this specification, a technology that can suppress the performance deviation of the electric working machine is disclosed.

[0008] Solutions for solving problems

[0009] The present specification discloses an electric working machine. The electric working machine comprises: an electric unit; a control unit that controls the electric unit; an operating member that is operated by an operator and can be moved to a first position; a first switch that is operated by the operating member while the operating member moves to the first position; and a second switch that is operated by the operating member while the operating member moves to the first position. The second position and the third position are located within the period during which the operating member moves to the first position. When the operating member moves between the second position and the first position, the first switch sends a first signal that changes as the operating member moves from the second position toward the first position to the control unit. When the operating member moves toward the first position and exceeds the third position, the second switch sends a second signal to the control unit, and the control unit controls the electric unit based on the first signal and the second signal.

[0010] In the above structure, the first switch sends the first signal to the control unit, and the second switch sends the second signal to the control unit. That is, neither switch switches the type of signal to be sent in accordance with the position of the operating member. In the case of such a structure, it is possible to use commonly used components with high reliability as the first switch and the second switch, and it is not easy to produce deviations due to manufacturing errors with respect to the second position of the first switch and the third position of the second switch. Therefore, it is possible to suppress deviations in the timing when the first switch starts to send the first signal and the timing when the second switch starts to send the second signal. In this way, it is possible to suppress deviations in the performance of the electric working machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a perspective view of the electric working machine 2 according to the first embodiment as viewed from the rear right side.

[0012] Figure 2 This is a perspective view of the electric working machine 2 according to the first embodiment as viewed from the front left side.

[0013] Figure 3 It is a perspective view of the trigger 14 , the cruise control lever 16 , the first switch 118 , the second switch 120 , the urging member 122 , the plate member 124 , and the resistance member 126 of the first embodiment.

[0014] Figure 4 This is a perspective view of the electric working machine 2 from which the right grip housing 20 of the first embodiment is removed, as seen from the rear right side.

[0015] Figure 5 It is a cross-sectional view of the electric working machine 2 with the grip housing 10 of the first embodiment removed.

[0016] Figure 6This is a diagram showing the vicinity of the trigger 14 when the trigger 14 is located at the second position, as viewed from the right side in a state where the right grip housing 20 of the first embodiment is removed.

[0017] Figure 7 This is a diagram showing the vicinity of the trigger 14 when the trigger 14 is located at the third position, as viewed from the right side in a state where the right grip housing 20 of the first embodiment is removed.

[0018] Figure 8 This is a diagram showing the vicinity of the trigger 14 when the trigger 14 is located at the first position, as viewed from the right side in a state where the right grip housing 20 of the first embodiment is removed.

[0019] Fig. 9 1 is a diagram showing the relationship between the operation amount of the trigger 14 and the rotation speed of the electric motor 106 according to the first embodiment.

[0020] Fig.10 1 is a diagram showing the relationship between the operation amount of the trigger 14 and the rotation speed of the electric motor 106 according to the first modified example of the first embodiment.

[0021] Fig.11 It is a diagram showing the relationship between the operation amount of the trigger 14 and the rotation speed of the electric motor 106 according to the second modified example of the first embodiment.

[0022] Fig.12 This is a diagram of the electric working machine 2 according to the second embodiment as viewed from the right side.

[0023] Description of Reference Numerals

[0024] 2. Electric working machinery; 10. Grip housing; 12. Power cord; 14. Trigger; 16. Cruise control lever; 18. Control unit; 42. Trigger operating unit; 44. Trigger protrusion; 46. Switch pressing unit; 50. Lever operating unit; 52. Connecting unit; 54. Rotating unit; 56. Stopper; 66. Motor housing; 68. Rear housing; 70. Spray nozzle; 80. Outer cylinder member; 96. Fin; 98. Inner cylinder member; 106. Electric motor; 108. Fan; 118. 1st switch; 118a. 1st switch button; 120. 2nd switch; 120a. 2nd switch button; 122. Force member; 124. Plate member; 126. Resistance member; AX1, AX2, rotation axis. DETAILED DESCRIPTION

[0025] Representative and non-limiting specific examples of the present invention are described in detail with reference to the accompanying drawings. This detailed description is intended only to show the details of the preferred examples for implementing the present invention to those skilled in the art, and is not intended to limit the scope of the present invention. In addition, the disclosed additional features and technical solutions can be used separately or together with other features and technical solutions to provide a further improved electric working machine.

[0026] In addition, the combination of features and processes disclosed in the following detailed description is not necessary for practicing the present invention in the broadest sense, but is only recorded for the purpose of specifically illustrating the representative specific examples of the present invention. Furthermore, when providing additional and useful embodiments of the present invention, the various features of the following representative specific examples and the various features described in the claims do not necessarily have to be combined in the order of the specific examples or the enumeration described herein.

[0027] Different from the structures of the features described in the embodiments and / or claims, all the features described in this specification and / or claims are intended to be disclosed individually and independently of each other as limitations on the original disclosure and the specific matters described in the claims. In addition, all numerical ranges and records involving groups or groups are intended to disclose their intermediate structures as limitations on the original disclosure and the specific matters described in the claims.

[0028] In one or more embodiments, the third position may be located closer to the first position than the second position is to the first position.

[0029] In the above structure, when the operating member moves between the second position and the third position, only the first signal is sent to the control unit, and the second signal is not sent to the control unit. The operator moves the operating member between the second position and the third position, so that the electric unit can be driven by the control of the control unit based on the first signal.

[0030] In one or more embodiments, when two signals, namely, the first signal and the second signal, are transmitted to the control unit, the control unit may control the electric unit based on the second signal.

[0031] In the above structure, the control unit controls the electric unit based on the first signal when the operating member moves between the second position and the third position, and controls the electric unit based on the second signal when the operating member exceeds the third position. The operator can distinguish between the action based on the first signal of the electric unit and the action based on the second signal of the electric unit by adjusting the position of the operating member.

[0032] In one or more embodiments, the electric unit may include an electric motor. Alternatively, the electric working machine may further include: a fan driven by the electric motor; and a spray nozzle through which the air sent by the fan flows.

[0033] The above-mentioned electric working machine functions as a blower. In the above-mentioned configuration, the control unit controls the electric motor based on the first signal and the second signal, and the flow rate of the air flowing out of the ejection nozzle can be adjusted based on the respective signals.

[0034] In one or more embodiments, the control unit may increase the rotation speed of the electric motor based on the first signal as the operating member moves from the second position toward the first position, and may change the rotation speed of the electric motor to the first rotation speed based on the second signal.

[0035] In the above configuration, the control unit controls the rotation speed of the electric motor based on the first signal and the second signal. The operator can adjust the rotation speed of the electric motor to a desired rotation speed and the flow rate of air flowing out of the jet nozzle to a desired flow rate by adjusting the position of the operating member.

[0036] In one or more embodiments, the first rotation speed may be a rotation speed higher than a maximum rotation speed of the electric motor when the control unit controls the electric motor based on the first signal.

[0037] In the above configuration, when the control unit controls the electric motor based on the second signal, a rotation speed exceeding the range of the rotation speed of the electric motor controlled by the control unit based on the first signal can be achieved. This can improve operator convenience.

[0038] In one or more embodiments, the operating member may be a trigger that is pressed by an operator.

[0039] In the above-described configuration, the operator can control the operation of the electric working machine through simple operations.

[0040] In one or more embodiments, the electric working machine may further include a biasing member that biases the operating member from the first position toward the second position.

[0041] In the above-described configuration, when the operator releases his hand from the operating member, the operating member can be returned to the second position by the urging force generated by the urging member.

[0042] In one or more embodiments, the electric working machine may further include a resistance component, which is operated by the operating component when the operating component moves toward the first position and exceeds the third position, and the resistance component applies a force to the operating component to resist the movement of the operating component exceeding the third position.

[0043] In the above structure, when the operator operates the operating member to make it exceed the third position, it is necessary to apply a force greater than the force required to operate the operating member to the third position to the operating member. Thus, when the operator operates the operating member, it is easy to identify whether the operating member exceeds the third position, that is, whether it is switched to the state where the second switch sends the second signal to the control unit.

[0044] (First embodiment)

[0045] Reference Figures 1 to 9 The electric working machine 2 of the first embodiment is described. The electric working machine 2 is a blower for blowing together fallen leaves and the like. Figure 1 and Figure 2 As shown, the electric working machine 2 includes a grip housing 10, a power cord 12, a trigger 14, a cruise control lever 16, and a control unit 18 (see Figure 4 In the following description, the longitudinal direction of the electric working machine 2 is referred to as the front-rear direction, the direction perpendicular to the front-rear direction is referred to as the up-down direction of the electric working machine 2, and the direction perpendicular to the front-rear direction and the up-down direction is referred to as the left-right direction of the electric working machine 2.

[0046] The grip shell 10 is composed of a right grip shell 20 and a left grip shell 22. The right grip shell 20 defines the outer shape of the right half of the grip shell 10, and the left grip shell 22 defines the outer shape of the left half of the grip shell 10. The grip shell 10 has a first shell 26, a second shell 28, a third shell 30, and a fourth shell 32. The first shell 26, the second shell 28, the third shell 30, and the fourth shell 32 are formed integrally. The first shell 26 extends in the length direction.

[0047] The second housing 28 extends from the front portion of the upper surface of the first housing 26 toward the upper rear side. The third housing 30 extends from the rear portion of the upper surface of the first housing 26 toward the upper rear side. The fourth housing 32 extends from the upper portion of the rear surface of the second housing 28 toward the upper portion of the front surface of the third housing 30. The cross-sectional shape of the fourth housing 32 is a substantially circular shape. The fourth housing 32 is held by the operator. The power cord 12 is connected to the rear surface of the third housing 30. Electric power is supplied to the electric working machine 2 via the power cord 12. The power cord 12 is connected to, for example, a backpack-type battery or an external power source carried by the operator.

[0048] A main power switch 36 and a main power LED 38 are arranged on the upper surface of the third housing 30. The main power switch 36 receives an operation from an operator to switch the electric working machine 2 between on and off states. The main power LED 38 displays the electric working machine 2 between on and off states.

[0049] The trigger 14 is mounted on the lower front portion of the fourth housing 32. The operator can operate the trigger 14 using the fingers of the hand holding the fourth housing 32. The trigger 14 moves between an initial position where the trigger 14 is not pressed and a first position where the trigger 14 is fully pressed. Figure 3 As shown in FIG. 1 , the trigger 14 includes a trigger operating portion 42, a trigger protrusion 44, and a switch pressing portion 46. The trigger operating portion 42, the trigger protrusion 44, and the switch pressing portion 46 are formed integrally. The trigger operating portion 42 is supported by the second housing 28 in a manner that allows rotation around the rotation axis AX1. When the operator presses the trigger operating portion 42, the trigger operating portion 42 rotates around the rotation axis AX1. The rotation axis AX1 is disposed at the front end of the trigger operating portion 42. Even when the trigger 14 is located at the second position, the trigger operating portion 42 protrudes downward from the lower surface of the fourth housing 32.

[0050] like Figure 6 As shown in FIG. 4 , the trigger protrusion 44 and the switch pressing portion 46 are arranged inside the second housing 28. Figure 3 As shown, the trigger protrusion 44 is arranged at the front end of the trigger operating part 42. The trigger protrusion 44 extends in a direction substantially orthogonal to the upper surface of the trigger operating part 42. The switch pressing part 46 is arranged at the front end of the trigger operating part 42. The switch pressing part 46 extends from the trigger operating part 42 toward the front upper side. The trigger protrusion 44 and the switch pressing part 46 rotate integrally with the trigger operating part 42 around the rotation axis AX1.

[0051] The cruise control lever 16 includes a lever operating portion 50, a connecting portion 52, a rotating portion 54, and a stopper 56. Figure 2 As shown in FIG. 1 , the lever operation portion 50 is disposed outside the second housing 28 near the connection portion between the second housing 28 and the fourth housing 32. The lever operation portion 50 is operated by an operator. Figure 3As shown, when the operator operates the lever operating part 50, the lever operating part 50 rotates around the rotation axis AX2. The connecting part 52 extends from the right surface of the lever operating part 50 toward the right side. The connecting part 52 passes through the left surface of the second housing 28 and extends to the inside of the second housing 28, which is omitted from the illustration. The rotating part 54 and the stopper 56 are arranged inside the second housing 28. The rotating part 54 is connected to the connecting part 52. The stopper 56 protrudes from the right surface of the rotating part 54 toward the right side. The stopper 56 can abut against the trigger protrusion 44 from the rear side. The rotating part 54 and the stopper 56 rotate around the rotation axis AX2 integrally with the lever operating part 50.

[0052] A cushioning material (not shown) is sandwiched between the rotating portion 54 and the inner surface of the second housing 28, and the rotating portion 54 is fixed at a desired position by the friction force received from the cushioning material. The operator rotates the lever operating portion 50 to a desired position, and the stopper 56 can be fixed at a desired position. In a state where the stopper 56 abuts against the trigger protrusion 44 and is fixed at a desired position, even when the operator releases his hand from the trigger 14, the trigger 14 can be maintained in a pressed state.

[0053] like Figure 4 As shown, an opening 62 is formed on the front surface of the first housing 26. The opening 62 is arranged near the connection portion between the first housing 26 and the second housing 28. The opening 62 connects the inside and the outside of the grip housing 10.

[0054] The control unit 18 is arranged inside the first housing 26. The control unit 18 is arranged along the front-back direction and the left-right direction. The control unit 18 is arranged near the connection portion between the first housing 26 and the second housing 28. In the up-down direction, the control unit 18 is arranged above the opening 62. The control unit 18 is composed of a control substrate and a housing. The control substrate has a microcomputer and a plurality of switching elements. The control substrate is mounted on the housing, but the illustration is omitted. The switching element is, for example, an IGBT or a MOSFET. The switching element is controlled by the microcomputer to switch between an open state and a closed state.

[0055] The electric working machine 2 further includes a motor housing 66, a rear housing 68, a spray nozzle 70, and a cover member 72. The motor housing 66 is disposed inside the first housing 26. The rear housing 68 is connected to the rear end of the motor housing 66 and protrudes from the rear end of the first housing 26 toward the rear side. In addition, the rear housing 68 is fixed to the first housing 26. The spray nozzle 70 is connected to the front end of the motor housing 66 and protrudes from the front end of the first housing 26 toward the front side. In addition, the spray nozzle 70 is fixed to the first housing 26.

[0056] like Figure 5As shown, the rear housing 68 has a cylindrical shape whose inner peripheral surface diameter decreases from the rear side toward the front side. The rear housing 68 has an upstream passage 84 inside. A cover member 72 is mounted on the rear end of the rear housing 68. The cover member 72 covers the rear end opening of the rear housing 68. The cover member 72 has a plurality of air intake holes 72a. The plurality of air intake holes 72a penetrate the cover member 72 in the front-to-back direction. The plurality of air intake holes 72a connect the exterior of the electric working machine 2 and the upstream passage 84 of the rear housing 68.

[0057] The ejection nozzle 70 includes a first ejection nozzle 86 and a second ejection nozzle 88 (see Figure 1 ). The second ejection nozzle 88 is mounted on the front portion of the first ejection nozzle 86 in a manner that allows it to be attached and detached relative to the front portion of the first ejection nozzle 86. The first ejection nozzle 86 and the second ejection nozzle 88 have a cylindrical shape. The first ejection nozzle 86 and the second ejection nozzle 88 have a downstream passage 90 inside. An opening 86a is formed at the upper end portion of the first ejection nozzle 86. The opening 86a is arranged on the lower side of the control unit 18.

[0058] The motor housing 66 has an outer tube member 80, a plurality of fins 96, an inner tube member 98 and a cover member 100. The outer tube member 80, the plurality of fins 96 and the inner tube member 98 are formed integrally. The outer tube member 80 has a cylindrical shape extending in the front-rear direction. The outer tube member 80 has an air passage 82 inside. The upstream end of the air passage 82 is connected to the upstream passage 84 of the rear housing 68, and the downstream end of the air passage 82 is connected to the downstream passage 90 of the ejection nozzle 70. The plurality of fins 96 extend from the inner circumferential surface of the outer tube member 80 toward the central axis of the outer tube member 80. The plurality of fins 96 are arranged at equal intervals from each other in the circumferential direction of the inner circumferential surface of the outer tube member 80, and the illustration is omitted.

[0059] The inner tube member 98 is arranged inside the outer tube member 80. The inner tube member 98 extends in the front-to-back direction. A plurality of fins 96 extending from the inner circumferential surface of the outer tube member 80 are connected to the outer circumferential surface of the inner tube member 98. A cover member 100 is installed at the rear end of the inner tube member 98. The cover member 100 closes the rear end opening 102 of the inner tube member 98. A plurality of holes (not shown) are formed at the rear end of the cover member 100. A tapered portion 104 is installed at the front end of the inner tube member 98. The diameter of the outer circumferential surface of the tapered portion 104 decreases as it moves from the rear side toward the front side. A top opening is formed at the top end of the tapered portion 104.

[0060] The electric working machine 2 further includes an electric motor 106 and a fan 108. The electric motor 106 is, for example, an inner rotor type brushless motor. The electric motor 106 is disposed inside the inner cylinder member 98. The operation of the electric motor 106 is controlled by switching the on state and the off state of the switching element (not shown) through a microcomputer (not shown) of the control unit 18.

[0061] The fan 108 is, for example, an axial flow fan. The fan 108 rotates under the drive of the electric motor 106. When the fan 108 rotates, a negative pressure is generated on the rear side of the fan 108. As a result, air flows from the multiple air intake holes 72a of the cover member 72 into the upstream passage 84 of the rear housing 68, and flows into the air passage 82 of the outer tube member 80. Then, the air is sent to the front side by the fan 108, flows in the air passage 82 and the downstream passage 90 in sequence, and flows out from the top opening of the second ejection nozzle 88. In addition, a part of the air sent to the front side by the fan 108 invades the inside of the inner tube member 98 from the multiple holes (not shown) formed at the rear end of the cover member 100, flows toward the front side in the inside of the inner tube member 98, and then flows from the top opening of the tapered portion 104 to the downstream passage 90. As a result, the electric motor 106 is cooled. In addition, a part of the air flowing in the downstream passage 90 flows out to the outside of the first ejection nozzle 86 through the opening 86a. The outflowing air flows between the lower surface of the control unit 18 and the outer peripheral surface of the first ejection nozzle 86, and flows out to the outside of the grip housing 10 from the opening 62. Thus, the control unit 18 is cooled.

[0062] like Figure 6 As shown, the electric working machine 2 also has a first switch 118, a second switch 120, a force member 122, a plate member 124, and a resistance member 126. The first switch 118 and the second switch 120 are electrically connected to the control unit 18. The first switch 118 and the force member 122 are arranged inside the second housing 28. The first switch 118 has a first switch button 118a. While the trigger 14 moves between the initial position and the second position, the first switch button 118a is not pressed. In addition, the second position is located slightly closer to the first position side than the initial position. Therefore, even if the operator accidentally touches the trigger 14 located at the initial position, it is possible to prevent the first switch button 118a from being pressed. As shown in FIG. Figure 7 and Figure 8As shown, when the trigger 14 exceeds the third position, the first switch button 118a is pressed by the switch pressing portion 46. When the first switch button 118a is pressed, the first signal is sent from the first switch 118 to the control unit 18. The first signal is a signal that changes according to the amount of pressing of the first switch button 118a. In the present embodiment, as the amount of pressing of the first switch button 118a increases, the magnitude of the first signal gradually increases. The force applying member 122 surrounds the first switch button 118a. The force applying member 122 applies force to the first switch button 118a to return the first switch button 118a to the second position. Thus, even if the operator releases his finger from the trigger operating portion 42, the switch pressing portion 46 returns to the second position by applying force to the trigger 14 from the first position toward the second position.

[0063] like Figure 6 As shown, the second switch 120, the plate member 124, and the resistance member 126 are arranged inside the fourth housing 32. The plate member 124 has a straight portion 124b and a curved portion 124a. The straight portion 124b is arranged on the front side of the second switch 120. The lower end of the straight portion 124b is fixed to the lower part of the second switch 120. The curved portion 124a is curved from the upper end of the straight portion 124b toward the front side and then toward the rear side.

[0064] The resistance member 126 has a fixed portion 126a, a first straight portion 126b, a second straight portion 126c, and a third straight portion 126d. The fixed portion 126a is fixed to the fourth housing 32. The fixed portion 126a extends toward the substantially lower side and then extends toward the substantially front side in a curved manner. The first straight portion 126b extends from the front end portion of the fixed portion 126a toward the substantially upper side. The second straight portion 126c extends from the upper end portion of the first straight portion 126b toward the substantially front side. The third straight portion 126d extends from the front end portion of the second straight portion 126c toward the upper front side.

[0065] When the trigger 14 moves between the initial position and the third position, the curved portion 124a and the second straight portion 126c are separated from the trigger operating portion 42. In addition, the third position is located between the initial position and the first position, and is located closer to the first position than the second position is to the first position. Figure 7 As shown in FIG. 1 , when the trigger 14 moves from the initial position to the third position, the curved portion 124a and the second straight portion 126c abut against the trigger operating portion 42. Figure 8 As shown, when the trigger 14 moves beyond the third position toward the first position, the curved portion 124a is pushed backward by the trigger operating portion 42. As a result, the straight portion 124b is pushed backward, and the second switch button 120a (see Figure 6 and Figure 7) is pressed in by the straight portion 124b. When the second switch button 120a is pressed in, the second signal is sent from the second switch 120 to the control unit 18. The second signal is a constant signal that is independent of the amount of pressing of the second switch button 120a. On the other hand, when the trigger 14 moves toward the first position beyond the third position, the second straight portion 126c is pushed upward by the trigger operating portion 42, and the first straight portion 126b, the second straight portion 126c, and the third straight portion 126d are bent toward the rear side by elastic deformation. At this time, the trigger operating portion 42 switches from a state of abutting against the second straight portion 126c to a state of abutting against the third straight portion 126d. When the trigger 14 moves between the second position and the third position, the force generated by the force applying member 122 toward the second position acts on the trigger 14. On the other hand, when the trigger 14 moves beyond the third position toward the first position, in addition to the force generated by the force applying member 122 toward the second position acting on the trigger 14, the elastic restoring force of the resistance member 126 toward the second position also acts on the trigger 14. That is, when the trigger 14 moves beyond the third position, a force resisting the action of the trigger 14 beyond the third position is applied to the trigger operating portion 42. The force required for the operator to operate the trigger 14 beyond the third position is greater than the force required for the operator to operate the trigger 14 to the third position.

[0066] Next, refer to Figure 6 to Figure 9 , which illustrates the control of the electric motor 106 performed by the control unit 18. During the period when the trigger 14 moves between the initial position and the second position, as shown in FIG. Figure 6 As shown in FIG. 1 , the first switch button 118a is not pressed by the switch pressing portion 46, and the second switch button 120a is not pressed by the trigger operating portion 42. Therefore, both the first signal and the second signal are not sent to the control unit 18, and the control unit 18 does not control the electric motor 106. As a result, since the fan 108 does not rotate, air does not flow out from the top opening of the second ejection nozzle 88.

[0067] When the trigger 14 moves from the second position toward the third position, as shown in FIG. Figure 7 As shown in FIG. 1 , the first switch button 118a is pressed by the switch pressing portion 46. The amount of the first switch button 118a pressed increases as the trigger 14 moves from the second position toward the third position. On the other hand, the second switch button 120a is not pressed by the trigger operating portion 42. Therefore, only the first signal is sent to the control portion 18, and the second signal is not sent to the control portion 18. The size of the first signal sent increases as the amount of the first switch button 118a pressed increases. Fig. 9As shown, in this case, the control unit 18 controls the electric motor 106 so that the rotation speed of the electric motor 106 increases as the first switch button 118a is pressed more. Hereinafter, the mode in which the control unit 18 controls the electric motor 106 based on the first signal is referred to as the first mode. As the rotation speed of the electric motor 106 increases, the rotation speed of the fan 108 increases, and the flow rate of the air flowing out from the top opening of the second ejection nozzle 88 increases.

[0068] When the trigger 14 moves beyond the third position toward the first position, as shown in FIG. Figure 8 As shown, the second switch button 120a is pressed by the trigger operating unit 42. In addition, the first switch button 118a is continuously pressed by the switch pressing unit 46. Therefore, both the first signal and the second signal are sent to the control unit 18. The magnitude of the second signal is constant regardless of the amount of pressing of the second switch button 120a. Fig. 9 As shown in FIG. 1 , when the control unit 18 receives the second signal during the execution of the first mode based on the first signal, the control unit 18 stops the control of the electric motor 106 in the first mode, and controls the electric motor 106 based on the second signal to rotate at the first speed. Hereinafter, the mode in which the control unit 18 controls the electric motor 106 based on the second signal is referred to as the second mode. The first speed of the electric motor 106 when driven in the second mode is a speed higher than the maximum speed of the electric motor 106 when driven in the first mode. In the present embodiment, the first speed is 1.3 times the maximum speed of the electric motor 106 when driven in the first mode. When the electric motor 106 is driven in the second mode, the speed of the fan 108 becomes higher than that when the electric motor 106 is driven in the first mode, and the flow rate of the air flowing out from the top opening of the second ejection nozzle 88 becomes higher.

[0069] When the electric motor 106 is driven in the second mode, the electric motor 106 and the control unit 18 generate more heat than when the electric motor 106 is driven in the first mode, and the electric motor 106 and the control unit 18 are easily overheated. Therefore, the electric motor 106 cannot be driven for a long time in the second mode. In the present embodiment, when the control unit 18 passes the first period after the second signal is sent, that is, when the first period passes after the electric motor 106 is driven in the second mode, the control unit 18 stops controlling the electric motor 106 in the second mode and drives the electric motor 106 in the first mode. As a result, the rotation speed of the electric motor 106 is lower than the first rotation speed of the electric motor 106 when driven in the second mode. As a result, it is possible to suppress overheating of the electric motor 106 and the control unit 18.

[0070] (Effect)

[0071] The electric working machine 2 of the present embodiment includes: an electric motor 106; a control unit 18 that controls the electric motor 106; a trigger 14 that is operated by an operator and can be moved to a first position; a first switch 118 that is operated by the trigger 14 while the trigger 14 is moved to the first position; and a second switch 120 that is operated by the trigger 14 while the trigger 14 is moved to the first position. The second position and the third position are located within the period during which the operating member is moved to the first position. When the trigger 14 moves between the second position and the first position, the first switch 118 sends a first signal that changes as the trigger 14 moves from the second position to the first position to the control unit 18. When the trigger 14 moves toward the first position and exceeds the third position, the second switch 120 sends a second signal to the control unit 18. The control unit 18 controls the electric motor 106 based on the first signal and the second signal. In this structure, the first switch 118 sends the first signal to the control unit 18, and the second switch 120 sends the second signal to the control unit 18. That is, neither of the two switches switches the type of signal to be sent in accordance with the position of the trigger 14. In the case of such a structure, it is possible to use conventionally commonly used components with high reliability as the first switch 118 and the second switch 120, and it is not easy to produce deviations due to manufacturing errors with respect to the second position of the first switch 118 and the third position of the second switch 120. Therefore, it is possible to suppress deviations in the timing when the first switch 118 starts to send the first signal and the timing when the second switch 120 starts to send the second signal. As a result, it is possible to suppress deviations in the performance of the electric working machine 2.

[0072] In addition, the third position is located at a position where the distance from the third position to the first position is closer than the distance from the second position to the first position. In this configuration, when the trigger 14 moves between the second position and the third position, only the first signal is sent to the control unit 18, and the second signal is not sent to the control unit 18. When the operator moves the trigger 14 between the second position and the third position, the electric motor 106 can be driven by the control of the control unit 18 based on the first signal.

[0073] In addition, when the first signal and the second signal are sent to the control unit 18, the control unit 18 controls the electric motor 106 based on the second signal. In the above-mentioned structure, when the trigger 14 moves between the second position and the third position, the control unit 18 controls the electric motor 106 based on the first signal, and when the trigger 14 exceeds the third position, the control unit 18 controls the electric motor 106 based on the second signal. The operator can distinguish between the action based on the first signal of the electric motor 106 and the action based on the second signal of the electric motor 106 by adjusting the position of the trigger 14.

[0074] In addition, the electric motor 106 functions as an electric unit. The electric working machine 2 further includes a fan 108 driven by the electric motor 106 and a spray nozzle 70 for flowing the air sent by the fan 108. The electric working machine 2 functions as a blower. In this structure, the control unit 18 controls the electric motor 106 based on the first signal and the second signal, and the flow rate of the air flowing out of the spray nozzle 70 can be adjusted based on each signal.

[0075] In addition, the control unit 18 performs control to increase the rotation speed of the electric motor 106 as the trigger 14 moves from the second position to the first position based on the first signal, and the control unit 18 performs control to change the rotation speed of the electric motor 106 to the first rotation speed based on the second signal. In this structure, the control unit 18 controls the rotation speed of the electric motor 106 based on the first signal and the second signal. The operator can adjust the rotation speed of the electric motor 106 to a desired rotation speed by adjusting the position of the trigger 14, and can adjust the flow rate of the air flowing out of the ejection nozzle 70 to a desired flow rate.

[0076] In addition, the first rotation speed is a rotation speed higher than the maximum rotation speed of the electric motor 106 when the control unit 18 controls the electric motor 106 based on the first signal. In this configuration, when the electric motor 106 is controlled by the control unit 18 based on the second signal, a rotation speed exceeding the range of the rotation speed of the electric motor 106 controlled by the control unit 18 based on the first signal can be achieved. This can improve the convenience of the operator.

[0077] The trigger 14 functions as an operation member that is pushed in by the operator. In this configuration, the operator can control the operation of the electric working machine 2 through a simple operation.

[0078] The electric working machine 2 further includes an urging member 122 for urging the trigger 14 from the first position toward the second position. In this configuration, when the operator releases his hand from the trigger 14 , the urging force of the urging member 122 can return the trigger 14 to the second position.

[0079] In addition, the electric working machine 2 further includes a resistance member 126, which is operated by the trigger 14 when the trigger 14 moves toward the first position and exceeds the third position. The resistance member 126 applies a force to the trigger 14 that resists the action of the trigger 14 exceeding the third position. In this structure, when the operator operates the trigger 14 to exceed the third position, it is necessary to apply a force greater than the force required to operate the trigger 14 to the third position to the trigger 14. Therefore, when the operator operates the trigger 14, it is easy to recognize whether the trigger 14 exceeds the third position, that is, whether the trigger 14 is switched to the state where the second switch 120 sends the second signal to the control unit 18.

[0080] (Corresponding relationship)

[0081] The electric motor 106 is an example of an “electric unit”, and the trigger 14 is an example of an “operating member”.

[0082] (First Modification of the First Embodiment)

[0083] Reference Fig.10, a first variation of the first embodiment is described. In the first variation of the first embodiment, only the points different from the first embodiment are described, and the same reference numerals are used for the points that are the same as the first embodiment and the description is omitted. In the first variation of the first embodiment, the second position for operating the first switch button 118a is located closer to the first position than the second position in the case of the first embodiment. In addition, the third position for operating the second switch button 120a is located between the initial position and the second position. In this structure, while the trigger 14 moves between the initial position and the third position, the first switch button 118a is not pressed by the switch pressing portion 46, and the second switch button 120a is not pressed by the trigger operating portion 42. Therefore, both the first signal and the second signal are not sent to the control unit 18, and the control unit 18 does not drive the electric motor 106. When the trigger 14 exceeds the third position and moves toward the first position, the second switch button 120a is pressed by the trigger operating unit 42, and the second signal is sent to the control unit 18. On the other hand, the first switch button 118a is not pressed by the switch pressing unit 46, and the first signal is not sent to the control unit 18. In this modification, when the electric working machine 2 is switched from the off state to the on state by the operation of the main power switch 36, neither the first signal nor the second signal is sent to the control unit 18. Then, only when the second signal is sent to the control unit 18, the control unit 18 sets the electric motor 106 to the standby mode based on the second signal. Then, the control unit 18 performs the control of the control unit 18 based on the first signal only when the electric motor 106 is in the standby mode and the first signal is sent. Therefore, for example, when the electric working machine 2 is in the closed state, the trigger 14 is operated to a position between the third position and the second position, and then the electric working machine 2 is switched from the closed state to the open state. In this case, even if the trigger 14 is subsequently operated to exceed the second position and the first signal is sent to the control unit 18, the electric motor 106 will not be driven. In addition, in a modified example, the control unit 18 may release the standby mode of the electric motor 106 when the first signal is not sent after a predetermined period of time when the electric motor 106 is in the standby mode.

[0084] When the trigger 14 exceeds the second position while the electric motor 106 is in the standby mode, the first switch button 118a is pressed by the switch pressing portion 46, and the first signal is sent to the control unit 18. The control unit 18 drives the electric motor 106 in the standby mode based on the first signal. In this modified example, the rotation speed of the electric motor 106 increases as the amount of pressing of the first switch button 118a increases, and the electric motor 106 does not rotate at the first rotation speed.

[0085] (Second variation of the first embodiment)

[0086] Reference Fig.11 , the second modification of the first embodiment is described. In the second modification of the first embodiment, only the points different from the first embodiment are described, and the same reference numerals are given to the same points as the first embodiment, and the description is omitted. In the second modification of the first embodiment, when the control unit 18 sends the second signal in the state where the first signal has been sent, the electric motor 106 is driven. In addition, in the second modification of the first embodiment, the third position of operating the second switch button 120a is located at a position closer to the initial position than the third position in the case of the first embodiment. In this structure, during the period when the trigger 14 moves between the initial position and the second position, the first switch button 118a is not pressed by the switch pressing portion 46, and the second switch button 120a is not pressed by the trigger operating portion 42. Therefore, both the first signal and the second signal are not sent to the control unit 18, and the control unit 18 does not drive the electric motor 106. When the trigger 14 exceeds the second position and moves toward the third position, the first switch button 118a is pressed by the switch pressing portion 46, and the first signal is sent to the control portion 18. On the other hand, the second switch 120 is not pressed by the trigger operating portion 42, and the second signal is not sent to the control portion 18. In this case, the control portion 18 does not drive the electric motor 106. When the trigger 14 exceeds the third position, the second switch button 120a is pressed by the trigger operating portion 42, and the second signal is sent to the control portion 18. That is, the second signal is sent to the control portion 18 in a state where the first signal is sent to the control portion 18. In this case, the control portion 18 drives the electric motor 106. In this modification, the rotation speed of the electric motor 106 increases as the amount of pressing of the first switch button 118a increases, and the electric motor 106 does not rotate at the first rotation speed. In a modified example, when the control unit 18 does not transmit the second signal after a predetermined period has passed after transmitting the first signal, the electric motor 106 may not be controlled even if the second signal is transmitted after a predetermined period has passed.

[0087] (Second embodiment)

[0088] Reference Fig.12, the second embodiment is described. In the second embodiment, only the points different from the first embodiment are described, and the same reference numerals are given to the points that are the same as the first embodiment, and the description is omitted. The second embodiment is different from the first embodiment in that the electric working machine 2 has a battery pack B instead of the power cord 12. The battery pack B includes a lithium-ion battery cell. The power of the battery pack B is supplied to the electric motor 106. The battery pack B is mounted on the rear surface of the third housing 30 in a detachable manner. The battery pack B is mounted on the third housing 30 by sliding the battery pack B to the right relative to the third housing 30, and is removed from the third housing 30 by sliding the battery pack B to the left relative to the third housing 30. In addition, in a modified example, the battery pack B may be mounted on the third housing 30 by sliding the battery pack B downward relative to the third housing 30, and the battery pack B may be removed from the third housing 30 by sliding the battery pack B upward relative to the third housing 30. Alternatively, the battery pack B may be detachably mounted on the first outer casing 26 or the second outer casing 28 .

[0089] In the electric working machine 2 according to one embodiment, the second position may be the same as the initial position.

[0090] The electric working machine 2 of one embodiment may further include a liquid medicine storage portion and a solenoid valve. The liquid medicine storage portion may also store liquid medicine. In addition, the solenoid valve may also be opened when the second switch button 120a is pressed. When the solenoid valve is opened, the liquid medicine stored in the liquid medicine storage portion is supplied to the air passage 82 of the motor housing 66. As a result, the liquid medicine and air flow out from the top opening of the second spray nozzle 88.

[0091] In the electric working machine 2 according to one embodiment, the first switch 118 and the second switch 120 may be arranged inside the same housing to constitute a single switch unit.

[0092] The electric working machine 2 of one embodiment may further include a temperature sensor for detecting the temperature of the electric motor 106 or the temperature of the control unit 18. When the temperature of the electric motor 106 or the control unit 18 exceeds a predetermined temperature, the control unit 18 may control the electric motor 106 based on the first signal instead of the second signal when driving the electric motor 106 based on the second signal.

[0093] The electric working machine 2 of one embodiment is not limited to a blower, and may be, for example, a chain saw or a lawn mower. In this case, the rotation speed of the saw chain and the cutting blade is controlled by the control unit 18.

[0094] The electric working machine 2 according to one embodiment is not limited to the electric motor 106 , and may be, for example, an LED lamp. In this case, the light intensity is controlled by the control unit 18 .

Claims

1. An electric working machine, wherein: The electric working machine has: Electric motor; a control unit that controls the electric motor; An operating member, which is operated by an operator and can be moved to a first position; a first switch operated by the operating member while the operating member is moved to the first position; as well as a second switch operated by the operating member while the operating member is moved to the first position, The operating member moves to the second position, the third position, and the first position in sequence. The first switch transmits a first signal to the control unit that changes as the operating member moves from the second position toward the third position when the operating member moves between the second position and the third position. The second switch sends a second signal to the control unit when the operating member moves toward the first position and exceeds the third position. During the movement of the operating member from the second position to the third position, the control unit performs control based on the first signal to increase the rotation speed of the electric motor as the operating member moves from the second position toward the third position. The control unit controls the electric motor to change its rotation speed to a first rotation speed based on the second signal during movement of the operating member beyond the third position to the first position. The first rotation speed is a rotation speed higher than a maximum rotation speed of the electric motor when the control unit controls the electric motor based on the first signal.

2. The electric working machine according to claim 1, wherein: The third position is located at a position closer to the first position than the second position is to the first position.

3. The electric working machine according to claim 2, wherein: When both the first signal and the second signal are transmitted to the control unit, the control unit controls the electric motor based on the second signal.

4. The electric working machine according to any one of claims 1 to 3, wherein: The electric working machine also has: a fan driven by the electric motor; and The ejection nozzle allows the air sent by the fan to flow.

5. The electric working machine according to claim 3, wherein: The control unit controls the electric motor based on the first signal when a period during which the electric motor is controlled based on the second signal exceeds a first period.

6. The electric working machine according to any one of claims 1 to 3, wherein: The operating member is a trigger that is pressed by the operator.

7. The electric working machine according to any one of claims 1 to 3, wherein: The electric working machine further includes a biasing member that biases the operating member from the first position toward the second position.

8. The electric working machine according to claim 7, wherein: The electric working machine further includes a resistance member that is operated by the operating member when the operating member moves toward the first position and exceeds the third position. The resistance member applies a force to the operation member that resists the movement of the operation member beyond the third position.

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