work machine

Abstract

A working machine comprising a motor, an operating section which can be moved from an initial position by operation by a worker, and a control unit which controls the drive of the motor according to an operating state of the operating section and which can detect the position of the operating section. the control unit is switchable between several operating modes, which include a normal mode and a power-on interlock mode, wherein in normal mode the control unit only drives the motor as long as the operating section is in a switch-on area, and in switch-on interlock mode drives the motor regardless of the position of the operating section, wherein, when a switching operation is performed which involves the operating section entering the switch-on range several times, the control unit switches the operating mode to the switch-on interlock mode and sets the speed of the motor in the switch-on interlock mode according to a displacement measure of the operating section from the initial position during the switching operation.

Description

Technical area

[0001] The present invention relates to a working machine such as a blower or the like. General state of the art

[0002] As an example of a working machine, a blower is known which includes a fan that rotates by the driving force of a motor, a housing portion in which the motor and the fan are accommodated, and a nozzle portion that discharges air along an airflow generated by the rotation of the fan.

[0003] As such a blower, for example, Patent Document 1 discloses a blower whose rotational speed can be changed in response to the amount of operation of a trigger. This blower locks the power by operating a touch switch provided separately from the trigger. Prior art documentsPatent documents

[0004] Patent Document 1: JP 2014-36939 A Summary of the inventionObject of the present invention

[0005] Since the design of the blower (working machine) of Patent Document 1 above requires the operator to operate both the trigger and the touch switch to perform the power-on interlock, the design needs to be improved to improve the ease of operation when performing the power-on interlock. Furthermore, providing two operating sections, namely the trigger and the touch switch, results in an increase in the size of the working machine, so there is a need to simplify the design.

[0006] Further objects of the present invention will become apparent from the following description of an embodiment. Means of solving the task

[0007] A work machine according to the present invention includes a motor, an operating section that is displaceable from an initial position by operation by a worker, and a control unit that controls the driving of the motor according to an operating state of the operating section and can detect the position of the operating section. The control unit performs control to switch between a plurality of operating modes including a normal mode and a power-on interlock mode. Specifically, the control unit performs control in which it drives the motor in the normal mode as long as the operating section is in an on-state region and stops driving the motor as long as the operating section is in a off-state region. In the control unit, the motor is driven at a fixed speed in the power-on interlock mode regardless of the position of the operating section.When a switching operation is performed in the normal mode that involves the operation section entering the switch-on range multiple times, the control unit switches to the switch-on interlock mode and controls the motor in the switch-on interlock mode such that the speed of the motor is fixed according to a displacement amount of the operation section from an initial position in the switching operation. Effect of the invention

[0008] According to the present invention, the working characteristics of the working machine can be improved. Short description of the characters

[0009] They show: Fig. 1 is a side view of a work machine of an embodiment 1 of the present invention; Fig. 2 is a side sectional view showing the structure of the interior of the working machine Fig. 1 illustrates; Fig. 3 a side view of a removed state of a main nozzle on the working machine from Fig. 1; Fig. 4 a circuit block diagram of the design of the control system of the working machine from Fig. 1; Fig. 5 is a view schematically explaining operation in a normal mode and a power-on interlock mode and state transitions between these modes; Fig. 6 is a timeline diagram for comparatively explaining the relationship between a duty cycle in terms of the amount of operation of a trigger and an engine speed; and Fig. 7 is a flowchart for explaining a control operation of a control unit. Embodiment of the invention

[0010] An example of an embodiment of the present invention will be described in detail below with reference to the figures. In the present embodiment, the description will be made using a blower 1 as an example of a working machine. Fig. 1, the blower 1 is a working machine, also referred to as a compressed air cleaner, in which air taken in at the rear is discharged through a nozzle provided at the front in order to blow air onto a work site or the like.

[0011] As for the configuration of the blower 1, it includes a motor 10, a fan 10a that rotates by the driving force of the motor 10 and generates an air flow F1 in an axial direction C1 along the rotation axis of the motor 10, a housing portion 2 that accommodates the motor 10 and the fan 10a therein and has an exhaust portion 12 on a front (one) side in the axial direction C1, and a main nozzle (nozzle portion) 6 that is detachably attached to the exhaust portion 12.

[0012] The housing section 2 includes a motor case (first case section) 3 that houses the motor 10 and the fan 10a therein and has the exhaust section 12, a handle section 4 that extends in a direction intersecting the axial direction C1 (an up-down direction) from the motor case 3, and a battery mounting section (second case section) 5 that is connected to the handle section 4 so as to face the motor case 3 with the handle section 4 therebetween.

[0013] In other words, the motor housing 3 and the battery mounting portion 5 extend in the axial direction C1 so as to be substantially parallel to each other at the two end portions of the handle portion 4. That is, one end of the handle portion 4 is connected to the motor housing 3, and the other end of the handle portion 4 is connected to the battery mounting portion 5. The housing portion 2 includes two housing halves formed from a plastic such as nylon or polycarbonate, and the housing portion 2 is assembled by joining these two housing halves together.

[0014] In the blower 1 of the present embodiment, the direction along the rotation axis of the motor 10 is considered the axial direction C1 and is also referred to as the front-back direction. The direction intersecting the front-back direction and in which the handle portion 4 extends (extension direction E1) is referred to as the up-down direction. A direction orthogonal to the front-back direction and the up-down direction is referred to as the left-right direction.

[0015] As in Fig. As shown in FIG. 2, the motor 10 and the fan 10a are housed in the motor case 3. The motor 10 includes a stator 10b, which is a coil, and a rotor 10c, and is, for example, a brushless motor. The fan 10a is a centrifugal fan mounted on the rotating shaft of the rotor 10c, and it conveys air taken in through a rear air intake portion 11 of the motor case 3 to a main nozzle 6 mounted on the front side of the motor case 3. Specifically, the motor 10 with the fan 10a is provided in the motor case 3 in a tubular container. The main nozzle 6 is an example of the nozzle.

[0016] By the rotation of the fan impeller 10a, the motor 10 takes in air via a grille section 11a of the air intake section 11 and conveys the taken in air along an inner wall 10d of the tubular container to the main nozzle 6. At this time, due to the rotation of the fan impeller 10a, an air flow F1 flowing in the axial direction C1 is generated, and the air conveyed by the air flow F1 is discharged at the front end of the main nozzle 6.

[0017] In addition, a motor board 10e is attached to the motor 10, on which an inverter circuit of the motor 10 and a sensor for detecting the rotational position of the rotor 10c are mounted, and the motor board 10e is also accommodated in the motor housing 3.

[0018] The handle portion 4 has a trigger (operation portion) 9, which is a switch provided on the side of the motor housing 3 to the front (one) side in the axial direction C1, and can be pushed (operated by gripping and pulling) by a worker (not limited to a human, but also a robot or the like). The trigger 9 can be located in Fig. 4 together with a trigger switch 9A described below, and has a configuration in which the operating amount of the trigger (the operating amount) can be detected (see, for example, the trigger switch operating amount detecting unit 87 and the control unit 100 of Fig. 4).

[0019] Furthermore, a control board 8 on which a microcomputer is mounted is provided inside the handle portion 4. A battery pack 7 is detachably attached to the battery mounting portion 5, which supplies electrical power to the motor 10. Thus, when the trigger 9 is pulled, the fan 10a rotates due to the driving force of the motor 10, and due to the rotation of the fan 10a, the airflow F1 is generated in the axial direction C1. Thus, the air taken in at the rear air intake portion 11 is propelled forward as the airflow F1 and discharged from the head end of the main nozzle 6.

[0020] As in Fig. As shown in Figure 2, below the exhaust air portion 12 of the motor housing 3, a raised portion 15 is provided, which protrudes downward relative to the motor housing 3. The raised portion 15 includes an LED 17 that illuminates the location where air is blown, and an upper support portion (first support portion) 13 adjacent thereto. Thus, by providing the LED 17 on the raised portion 15 that protrudes forward relative to the motor housing 3, more brightness can be provided at the work site.

[0021] Next, with reference to Fig. 1 to 3, the structure of the main nozzle 6 provided on the blower 1 is described. The main nozzle 6 is formed in a tubular shape, with an opening diameter of a portion on the other end side being larger than that of a portion on the one end side.

[0022] More specifically, a section 12 of the exhaust air in Fig. 2, the foot-end part (part on the other end side) 6b mounted on the engine housing 3 includes an air intake opening 6d as a nozzle, and a head-end part (part on the one end side) 6a opposite the foot-end part 6b includes an exhaust air opening 6e as a nozzle. In the main nozzle 6, the foot-end part 6b is thicker than the head-end part 6a, and its shape becomes narrower towards the head end. Thus, the relationship applies: Opening diameter D2 of the air intake opening 6d of the foot-end part 6b > opening diameter D1 of the exhaust air opening 6e of the head-end part 6a. On the outer circumference of the foot-end part 6b, a convex section (see Fig. 2) formed.

[0023] Fig. 3 is a side view of a removed state of the main nozzle on the working machine of Fig. 1. As in Fig. 3, in the blower 1 of the present embodiment, the main nozzle 6 removed from the exhaust air section 12 can be inserted into (in other words, accommodated in) the motor housing 3.

[0024] When the main nozzle 6 is attached to the exhaust section 12 of the engine case 3, the convex portion 6b of the main nozzle 6 is fitted into a groove portion (not shown) provided on the exhaust section 12, whereby the main nozzle 6 can be attached to the engine case 3 by rotating the base-end part 6b. The main nozzle 6 is formed, for example, from hard rubber or the like.

[0025] Fig. 4 is a circuit block diagram of the design of the control system of the working machine of Fig. 1. As in Fig. 4, the blower 1 comprises an embodiment in which a motor output unit 30, the battery pack 7 and a circuit board unit 80 are electrically connected to one another.

[0026] Of these, the motor output unit 30 includes the above-described motor 10 and a motor control unit 31 for controlling the electric power supplied to the motor 10 and thus the operation of the motor 10. The motor control unit 31 controls the operation (rotation status) of the motor 10 based on control signals output from a control signal output circuit 82 described below. The motor control unit 31 detects the rotational speed of the motor 10 and supplies the detection result to the control unit 100 via a rotational speed detection circuit 81.

[0027] The battery pack 7 is, for example, a rechargeable secondary cell (lithium-ion battery or the like) having a structure in which, as shown in Fig. 4, several batteries are accommodated (packaged) in a series-connected state in a fixed container.

[0028] The circuit board unit 80 includes, as main components, several circuits mounted on the control board 8. Specifically, the circuit board unit 80 includes terminals 88, 89 connected to the trigger switch 9A of the aforementioned trigger (operating section) 9, and the rotation speed detection circuit 81 and the control signal output circuit 82 connected to the motor control unit 31 of the motor output unit 30.

[0029] As in Fig. 4, the circuit board unit 80 includes a current detection circuit 83, a power supply switch circuit 84, a power supply circuit 85, a trigger switch operation detection circuit 86, a trigger switch operation amount detection unit 87, and the control unit 100 that controls these circuits (blocks).

[0030] The current detection circuit 83 is connected to the battery pack 7 and a negative terminal side of the motor control unit 31 of the motor output unit 30, and outputs detected current values ​​to the control unit 100. The power supply switch circuit 84 is connected to the battery pack 7 and outputs to the power supply circuit 85 whether a main power switch (not shown) is on or off. When the power supply circuit 85 receives a signal from the power supply switch circuit 84 indicating that the main power switch is on, it applies a predetermined voltage to the control unit 100.

[0031] The trigger switch operation detection circuit 86 detects whether the trigger switch 9A is operated and outputs the detection result to the control unit 100. The trigger switch operation amount detection circuit 87 detects an operation amount of the trigger switch 9A (which substantially corresponds to an operation amount of the trigger 9) and outputs the detection result to the control unit 100.

[0032] The control unit 100 is, for example, a CPU or a hardware processor such as a microcomputer. The control unit 100 outputs a control signal to the motor control unit 31 via the control signal output circuit 82 in response to the detection results of the trigger switch operation detection circuit 86 and the trigger switch operation amount detection circuit 87.

[0033] Next, the essential elements of a conventional design and the present embodiment with respect to a power-on interlock drive will be described.

[0034] The configuration of a conventional working machine with respect to the on-lock drive is as follows. For example, when a trigger locking switch (not shown) is turned on and the trigger 9 is pulled to a maximum extent, for example, the on-lock drive is performed, in which the rotational speed of the motor 10 is controlled to be fixed regardless of the amount of operation (operating amount) of the trigger 9. The trigger locking switch may be of an electrical type or a mechanical type.

[0035] However, the above-mentioned conventional design increases costs due to the use of the trigger lock switch. The conventional design also requires improvement in terms of operator convenience when transitioning to the locking mechanism (complexity of operation). Furthermore, it is assumed that the conventional design has limitations (certain constraints) regarding the development of a multi-stage locking mechanism, or in other words, specifications for multi-stage locking of the speed of motor 10.

[0036] Therefore, the present embodiment proposes and adopts the following configuration for the power-on interlock drive.

[0037] In summary, in the working machine of the present embodiment, the switch-on lock drive is performed by fixing the rotational speed of the motor 10 in accordance with the operation amount in the case where the trigger (operation section) 9 is operated (operated) by the worker several times within a short period of time.

[0038] Specifically, the working machine of the present embodiment is configured such that, under the control of the above-mentioned control unit 100, the rotation of the motor 10 can be switched between a plurality of operating modes, namely a normal mode and a power-on interlock mode. Other (three or more) modes may be provided as the plurality of operating modes, but descriptions of the third or more modes will be omitted to avoid excessive volume and unnecessary complexity of the description.

[0039] In the working machine of the present embodiment, in the normal mode, the control unit 100 drives the motor 10 as long as the trigger (operation section) 9 is in an ON range, and stops the drive of the motor 10 as long as the trigger 9 is in a OFF range.

[0040] More specifically, in the normal mode, the control unit 100 controls the rotational speed of the motor 10 according to a displacement amount of the above-mentioned trigger switch 9A, which is operated integrally with the trigger (operating section) 9. Since this operation mode of the motor 10 is conventional, a more detailed description will be omitted.

[0041] Next, with reference to Fig. 5 describes the normal mode and the power-on lock mode as well as the transition between these modes.

[0042] Fig. 5 is a view for schematically explaining operations in the normal mode and the power-on interlock mode of the working machine of the present embodiment and state transitions between these modes.

[0043] First, the normal mode is described. In the following description, the "initial state" of trigger 9 refers to an actuation distance of trigger 9 (operating section) of zero.

[0044] If the deduction 9 is made by the work force from the initial state (in Fig. 5 as “Stop”) is actuated by any actuation amount (in Fig. 5 for simplicity, referred to as "trigger hold"), the control unit 100 causes the engine of the work machine to transition to (or maintain) normal mode.

[0045] In this normal mode, the motor 10 is driven by the control of the control unit 100 according to the amount of operation of the trigger 9. Thus, in the normal mode, the higher the amount of operation of the trigger 9, the more the amount of electrical energy supplied to the motor 10 increases, so that the motor 10 rotates faster and the amount of blown air increases. Conversely, the lower the amount of operation of the trigger 9, the more the amount of electrical energy supplied to the motor 10 decreases, so that the motor 10 rotates slower and the amount of blown air decreases.

[0046] When the trigger 9 returns to the initial state (zero actuation amount) in this normal mode, the amount of electrical energy supplied to the motor 10 becomes zero by means of the control of the control unit 100, so that the motor 10 stops. However, since the motor 10 continues to rotate in practice due to inertial force, it happens that the motor 10 stops where in Fig. 5 “Stop” has not actually stopped yet. Therefore, it may be that the state of “Stop” in Fig. 5 is also called “hold mode”.

[0047] Description of the Power-on Interlock Mode The Power-on Interlock Mode is described next. When the power is locked in the above-mentioned hold mode (in Fig. 5 for the sake of simplicity, referred to as "hold") the trigger 9 is quickly operated (pressed) twice by the worker, a transition from the hold mode to the switch-on lock mode (state transition) is carried out by means of the control by the control unit 100.

[0048] The power-on lock mode is a mode in which the amount of electrical power supplied to the motor 10 is fixed. In other words, in the power-on lock mode, the amount of electrical power supplied to the motor 10 remains fixed even if the trigger 9 is released by the operator and the trigger 9 returns to its initial state (zero actuation amount), thus being a mode in which blowing air is discharged.

[0049] In the present embodiment, in the power-on interlock mode, a distinction is roughly made between (1) a weak power-on interlock operation state in which the amount of electric power supplied to the motor 10 is small, and (2) a strong power-on interlock operation state in which the amount of electric power supplied to the motor 10 is high (higher than in (1)).

[0050] The power-on interlock mode is not limited to these two modes, and a configuration is also possible in which it includes, for example, (3) a medium power-on interlock operating state in which the amount of electric power supplied to the motor 10 is medium, or a configuration in which the operating state is finely divided into more stages (such as (4), (5)...). Such a fine-graded configuration would be difficult to describe in detail, so its description is omitted for the sake of brevity. The power-on interlock mode will be described below, focusing on (1) weak power-on interlock operating state and (2) strong power-on interlock operating state.

[0051] In the present embodiment, when the trigger 9 is quickly operated (pressed) twice and the operating amount of the trigger 9 exceeds a threshold value twice (which is shown for the sake of simplicity in Fig. 5 is referenced as "strong operation"), a transition to the strong power-on interlock operating state occurs. In the strong power-on interlock operating state of the power-on interlock mode, the amount of electrical energy supplied to the motor 10 is greater than in (1), which is why stronger air (blast air) is discharged (blown out) from the tip end of the main nozzle 6.

[0052] If, on the other hand, the trigger 9 is quickly operated (pressed) twice and the actuation amount of the trigger 9 is only once at or below the threshold value (which for the sake of simplicity is Fig. 5 is referenced as "weak operation"), a transition to the weak power-on interlock operating state occurs. In the weak power-on interlock operating state of the power-on interlock mode, the amount of electrical energy supplied to the motor 10 is lower than in (2), which is why weaker blowing air is blown out.

[0053] As a modification example, a configuration is possible in which the sum of the 2-time actuation of the trigger 9 (i.e., an average value) is considered as a threshold value for switching between the weak power-on lock operating state and the strong power-on lock operating state.

[0054] To express it symbolically for better understanding, this operation can be described as an operation corresponding to a double-click of a mouse, which is why this operation is also referred to as “double-click” for the sake of simplicity.

[0055] Next, with reference to Fig. 6 describes the relationship between the actuation amount of the trigger 9 and the speed of the motor 10. Fig. 6 is a timeline diagram for comparatively explaining the relationship between a duty cycle with respect to the trigger pull amount and the engine speed.

[0056] The curve diagrams shown in Fig. 6, shown in three rows one above the other, are timeline diagrams that comparatively show the values ​​for the actuation amount of the trigger 9 (hereinafter also referred to as the actuation amount), a duty cycle, and the motor speed, with the timeline indicated on the horizontal axis of the curve diagrams. A range in which the actuation amount of the trigger 9 is zero or greater and less than the "contact point on" corresponds to the off-state range of the operating section, and a range in which the actuation amount of the trigger 9 is at or above the "contact point on" and at or below the full actuation amount corresponds to the on-state range of the operating section.

[0057] With reference to Fig. 6 shows that in the initial state after switching on the main power supply (time t0 at the left end of the curve diagrams), the values ​​for actuation amount, duty cycle and motor speed are each zero.

[0058] If, at time t1, the trigger 9 is pulled from its initial position and the contact point of the trigger switch 9A is switched on after several actuation degrees (see time t2 and "contact point on" in the actuation degree curve diagram), the duty cycle increases to 6%. When the duty cycle is at 6%, the motor speed in this example increases to 30,000 (rpm) (see time t3 and speed curve diagram).

[0059] As the actuation amount of the trigger 9 further increases, the speed control of motor 10 begins (see "Speed ​​control starts" in the figure), the duty cycle rises above 6%, and along with this increase, the speed of motor 10 also increases further (for simplicity, see the values ​​of the curve diagrams in the period between time t3 and time t4). As the duty cycle increases from 6% to 100%, the speed of motor 10 increases to the maximum speed (in this example, approximately 80,000 rpm) (see time t4 and the speed curve diagram).

[0060] In normal mode, the duty cycle remains at 100% up to the range where the amount of actuation of the trigger 9 reaches the full amount of actuation from the amount corresponding to the maximum speed control, and the speed of the motor 10 also remains at the maximum speed (about 80,000 rpm).

[0061] Then, when the amount of operation of the trigger 9 gradually decreases, the speed of the motor 10 remains at the maximum speed (about 80,000 rpm) until the amount of operation corresponding to the maximum speed control (for simplicity, see the values ​​of the curve diagrams at time t5).

[0062] If the actuation amount of the trigger 9 decreases further from the actuation amount corresponding to the maximum speed control, the control degree and the speed of the motor 10 also decrease together with the decrease in the actuation amount (for the sake of simplicity, see the values ​​of the curve diagrams in the period between time t5 and time t6). [Transition to power-on lock mode]

[0063] Next, the state of the actuation amount, the duty cycle, and the motor speed when entering the power-on interlock mode is described. <Transition to weak power-on interlock mode>

[0064] As can be seen from the middle position in the left-right direction of the individual curve diagrams Fig. As can be seen from Figure 6 (time t8 to time t11), if the trigger 9 is pulled (double-clicked) twice within a specified threshold period (in this example, approximately 200 milliseconds (ms)), the duty cycle waveform increases twice. The operation of the motor 10 when the duty cycle waveform increases twice is one small rotation each time, as shown in the "Speed" graph.

[0065] If there is only one of the two operations of the trigger 9 in which the Fig. 6 does not exceed the threshold value TH (in this example, the operation amount of 95% of the maximum speed control), the transition processing to the weak power-on interlock mode is performed.

[0066] More specifically, the transition to the weak lock-on mode begins at the end of the second pull of the trigger 9, i.e., when the contact point of the trigger switch 9A is turned off, resulting in the lock-on state in which the motor 10 is maintained at a low speed (in this example, approximately 30,000 rpm) (see time t11 to time t12). In the lock-on state in this weak mode, the duty cycle is maintained at approximately 6%, as can be seen from the middle curve diagram of Fig. 6. The low speed of motor 10 (in this example, approximately 30,000 revolutions) corresponds to the second speed. <Transition to strong power-on interlock mode>

[0067] As can be seen from the time points t12 to t15 of the curve diagrams from Fig. 6, in the event that the trigger 9 is operated twice as described above within the specified threshold duration (200 ms) and the two operations both exceed the threshold TH (operation amount of 95% of the maximum speed control), transition processing to the strong mode is performed.

[0068] More specifically, and as can be seen from time t12 to time t15 of the "Speed" graph, in the process in which the trigger 9 is pulled twice from the power-on interlock state (period B), the normal state is established between the first time (time t12) and the completion of the second time (time t15). The transition to the strong power-on interlock mode then begins at the end of the two pulls of the trigger 9 (turning off the contact point of the trigger switch 9A), and the power-on interlock state is established in which the motor 10 is maintained at high speed (in this example, approximately 80,000 revolutions) (see time t15 to time t16). In the power-on interlock state in this strong mode, the duty cycle is essentially maintained at 100%, as can be seen from the middle graph of Fig. 6. The high speed of motor 10 (in this example, approximately 80,000 revolutions) corresponds to the first speed. <Rückkehr in den Normalmodus>

[0069] If, as in the example from Fig. 6, at time t16, during the power-on lock state, the trigger 9 is operated so that the contact point of the trigger switch 9A is turned on, a return to normal mode occurs (see period E). In this example, the trigger 9 returns to the initial state (duty factor and speed at 6% and 30,000 rpm, respectively) at time t17, and the motor 10 stops at time t18.

[0070] As described in detail above, the working machine (blower 1) of the present embodiment includes the engine 10, the operating section 9, which is displaceable from an initial position by operation by a worker, and the control unit 100, which controls the driving of the engine 10 according to the operating state of the operating section 9 and can detect the position of the operating section 9. The control unit 100 performs control to switch between a plurality of operation modes including the normal mode and the power-on interlock mode. Specifically, in the normal mode, the control unit 100 drives the motor 10 as long as the operating section 9 is in the power-on range, and stops the driving of the motor 10 as long as the operating section 9 is in the power-off range. In the power-on interlock mode, the control unit 100 drives the motor 10 regardless of the position of the operating section 9.When a switching operation is performed in the normal mode, which involves the operation section 9 entering the power-on range several times, the control unit 100 switches to the power-on interlock mode and controls the motor 10 in the power-on interlock mode such that the rotational speed of the motor 10 is fixed according to a displacement amount of the operation section 9 in the switching operation from the initial position.

[0071] According to the working machine of the present embodiment having this configuration, the operability can be improved.

[0072] The present invention is not limited to the embodiment described above and can be modified in various ways within the scope of its essential features. <abwandlungsbeispiel>

[0073] In the above embodiment, the case where the threshold value of the operation amount (first threshold value) TH is 95% of the maximum speed control of the trigger (operation section) 9 was described. The threshold value TH is not limited to this and can be set to any value within a range of 60% to 100% of the maximum speed control.

[0074] In the above embodiment, the case where the threshold duration is 200 ms was described. The threshold duration is not limited to this and can be set to any value within a range of 60 ms to 2000 ms. Explanation of reference symbols 1 blower (work machine) 2 Housing section 3 Motor housing (first housing section) 4 Handle section 5 Battery mounting section (second housing section) 6 Main nozzle (nozzle section) 6a head-end part (part on the side of one end, end section on the side of the first housing section) 6b foot-end part (part on the side of the other end, end section on the side of the second housing section) 6c Outer peripheral section 6d Air intake opening 6e Exhaust air opening 6f convex section 7 Battery pack 8 Control board 9 Trigger (operating section) 9A trigger switch 10 Engine 10a Fan wheel 10b Stator 10c rotor 10d interior wall 10th motor board 11 Air intake section 11a Grid section 12 exhaust air section 12a Groove section 13 upper holding section (first holding section, holding section) 13a first groove section 13b second groove section 14 lower holding section (second holding section, holding section) 14a preceding section 15 Survey section 16 Auxiliary nozzle (nozzle section) 17 LED 18 Recording room 19 Control room 30 Motor output unit 31 Engine control unit 80 board unit 81 Speed ​​detection circuit 82 Control signal output circuit 83 Current detection circuit 84 Power supply switch circuit 85 Power supply circuit 86 Trigger switch operation detection circuit 87 Trigger switch operating dimension detection unit 88, 89 connection 100 control unit C1 axial direction D1, D2 opening diameter E1 Extension direction F1 airflow G1, G2 diameter L1 Length of the handle section L2 Length of grip section + trigger L3, L4, L5 distance QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2014-36939 A

[0004] < / abwandlungsbeispiel>

Claims

[1] A working machine comprising an engine, an operating section which can be displaced from an initial position by operation by a worker, and a control unit which controls the drive of the engine according to an operating state of the operating section and can detect the position of the operating section, wherein the control unit is switchable between several operating modes, which include a normal mode and a power-on lock mode, wherein the control unit drives the motor as the normal mode only as long as the operating section is in a switch-on range, and drives the motor in the switch-on interlock mode regardless of the position of the operating section, wherein the control unit, when a switching operation is performed which involves the operation section entering the power-on range a plurality of times, switches the operation mode to the power-on interlock mode and adjusts the rotational speed of the motor in the power-on interlock mode according to a displacement amount of the operation section from the initial position in the switching operation. [2] A working machine according to claim 1, wherein the switching operation comprises a back-and-forth operation in which the operating section moves from the switching-on area to the switching-off area, back to the switching-on area and back to the switching-off area. [3] The work machine according to claim 1, wherein, in the power-on lock mode, the control unit performs control to drive the motor at a first speed and a second speed lower than the first speed, the control unit driving the motor at the first speed when, in the case where the operation section is in the power-on range a plurality of times in the switching operation, a maximum value of the displacement amount of the operation section from the initial position always exceeds a first threshold value. [4] The working machine according to claim 1, wherein the control unit switches to the normal mode when the operation section moves from the off-state area to the on-state area in the power-on interlock mode. [5] Working machine according to claim 1, wherein several times is 2 times. [6] The working machine according to claim 3, wherein the first threshold value is set to a range of 60% to 100% of a maximum speed control of the operating section. [7] The work machine according to claim 5, wherein the control unit performs processing for transitioning to the power-on interlock mode in the case where the duration of the back-and-forth operation in the 2-times back-and-forth operation is within a range of 60 ms to 300 ms. [8] Working machine according to claim 1, comprising: a fan wheel driven by the driving force of an engine, a housing in which the motor and the fan wheel are accommodated and which has an intake opening, which is an inlet, for an air flow due to the fan wheel, and an exhaust opening which is an outlet, and a nozzle which is detachably attached to the exhaust opening. [9] A work machine comprising an engine, an operation section operated by a worker, and a control unit that controls the drive of the engine according to an operation state of the operation section, wherein the control unit, when an operation of the operation section is performed without a switching operation being performed on the operation section, drives the engine only as long as the operation section is in a power-on range, and drives the engine regardless of the position of the operation section when a switching operation is performed on the operation section, wherein the control unit sets a rotation speed of the engine after the switching operation is performed on the operation section according to the switching operation.

Images