Work machine

Abstract

The invention provides a work machine with improved convenience. A nailing machine (10) includes a motor (22), a control unit (30), a 5V generation circuit (74), and a switching unit (40). The control unit (30) controls the driving of the motor (22). The 5V generation circuit (74) is capable of switching between a supply state and a stop state of power to the control unit (30). The switching unit (40) has a switching unit (43) that switches between a supply state and a stop state of power to the 5V generation circuit (74). When the switch unit (43) is switched to the ON state, the switching unit (40) switches the state of the 5V generation circuit (74) to the supply state. The switching unit (40) switches the state of the 5V generation circuit (74) to a stopped state when the switch unit (43) is maintained in the ON state and a first predetermined time has elapsed.

Description

Technical Field

[0001] This invention relates to a work machine. Background Technology

[0002] The work machine described in Patent Document 1 includes a drive source, a control circuit, and a first operating unit and a second operating unit capable of switching positions via operator operation. The control circuit performs a first on-time determination, a first off-time determination, and a second on-time determination, and a second off-time determination, to determine the movement of the first operating unit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. WO / 2021 / 220703 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Like the work machine in Patent Document 1, in work machines that determine whether an operation unit is on or off, if a malfunction occurs in the operation unit and the switching action cannot be performed, an on / off determination continues to be output. Therefore, even when a shutdown action should be performed, the on / off state continues, potentially consuming power unnecessarily. In other words, the convenience of the work machine may be reduced.

[0008] The purpose of this invention is to provide an operating machine that improves convenience.

[0009] Methods for solving problems

[0010] One embodiment of the work machine includes: a motor; a control unit that controls the driving of the motor; a power supply unit capable of switching between a supply state (supplying power to the control unit) and a stop state (not supplying power to the control unit); and a switching unit that switches the operating state of the power supply unit to either the supply state or the stop state. The switching unit has a switch that switches between an on state and an off state by operation of an operator. When the power supply unit is in the stop state, if the switch switches from the off state to the on state, the switching unit switches the state of the power supply unit from the stop state to the supply state. Even if the switch remains in the on state, after a first predetermined time, the switching unit switches the state of the power supply unit from the supply state to the stop state.

[0011] Invention Effects

[0012] According to the present invention, the convenience of the work machine can be improved. Attached Figure Description

[0013] Figure 1 This is a right-side view showing the internal structure of the work machine according to an embodiment of the present invention.

[0014] Figure 2 It means Figure 1 A diagram showing the structure of the main parts of the nailing machine in the standby position.

[0015] Figure 3 From Figure 2 Observe in the direction of arrow A Figure 1 A diagram showing the main parts of the nailing machine in its standby position.

[0016] Figure 4 It means Figure 1 A diagram showing the construction of the main part at the top stop of the nailing machine.

[0017] Figure 5 It means Figure 1 A diagram showing the structure of the main parts at the bottom stop point during normal operation of a nailing machine.

[0018] Figure 6 It means Figure 1 The circuit block diagram of the main structure of the nailing machine is shown.

[0019] Figure 7 It means in Figure 1 The diagram shows the timing of changes in each item when the battery of the nailing machine is connected and the switch is pressed to the ON state.

[0020] Figure 8 This indicates that the control department judges it to be in Figure 1 The diagram shows the timing of changes in each item when a battery is connected to the nail machine.

[0021] Figure 9 This indicates that the control department judges it to be in Figure 1 The diagram shows the time series of changes in each item when the battery is not connected in the nail machine. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in all the drawings referred to for the purpose of explaining the embodiments, the same reference numerals are used for the same or substantially the same structures and elements. Additionally, structures and elements that have been described once will generally not be described again.

[0023] [Components of a nailing machine]

[0024] Figure 1 A nailing machine 10 is shown as an example of a nailing machine. Additionally, in Figure 1In this description, the direction indicated by arrow B1 is taken as the downward direction, and the direction indicated by arrow B2 is taken as the upward direction. Furthermore, the directions orthogonal to the upward and downward directions and mutually orthogonal to each other are defined as the front-back direction and the left-right direction. The nailing machine 10 drives a nail N, which serves as a stop, into the target material G. The nailing machine 10 has a housing 11, which serves as an example of the main body of the nailing machine 10.

[0025] The nailing machine 10 (casing 11) includes a motor 22, a control unit 30, and a 5V generation circuit 74. Figure 6 ) and switching part 40. In addition, the housing 11 has a cylindrical part 12, a motor housing 14, a handle 15 and a mounting part 16.

[0026] The cylindrical portion 12 is formed into a cylindrical shape extending vertically. The motor housing 14 is formed into a cylindrical shape extending rearward from the cylindrical portion 12. The handle 15 is formed into a cylindrical shape extending rearward from the cylindrical portion 12. The handle 15 is located above the motor housing 14. The handle 15 is held by the operator.

[0027] Mounting part 16 connects the rear end of motor housing 14 to the rear end of handle 15 in the vertical direction. Battery 32 is electrically connected to mounting part 16. Battery 32 is configured to be able to be connected (installed) and disconnected relative to mounting part 16.

[0028] The hoisting gear 26, plunger 34, drive blade 36, spring 37, counterweight 38, etc., are housed in the cylinder 12. An ejection section 13 is provided below the cylinder 12 to support the nails N for ejection. A nail magazine 19 capable of holding multiple nails N is installed below the motor housing 14. The nails N held in the nail magazine 19 are fed one by one into the ejection section 13. A push rod 42 is provided below the cylinder 12.

[0029] <Motor>

[0030] Motor 22 is housed together with gearbox 24 in motor housing 14. Motor 22 has a rotor and stator (not shown). When powered by battery 32, the rotor of motor 22 rotates, and the motor shaft mounted on the rotor rotates. Motor 22 is, for example, a brushed motor.

[0031] The gearbox 24 has an input element, a planetary gear mechanism, and an output element. The input element is connected to the motor shaft of the motor 22 and rotates integrally with the motor shaft. The output element is connected to the first gear 27 (…). Figure 2 The first gear 27 is connected to the rotating shaft of the hoisting gear 26 and rotates as a whole.

[0032] When the driving force based on the rotation of the motor shaft is transmitted to the input element, deceleration based on the planetary gear mechanism is performed and transmitted to the output element. That is, the motor 22, gearbox 24 and first gear 27, which transmit the driving force generated by the rotation of the motor 22 to the first gear 27, are arranged coaxially in the front-rear direction.

[0033] <Control Department>

[0034] As an example, the control unit 30 can operate via a 5V power supply, controlling the driving and stopping of the motor 22. Furthermore, the 5V power supply enabling the control unit 30 to operate is supplied by the 5V generation circuit 74 described later. Figure 6 ) to supply to the control department 30.

[0035] As an example, the control unit 30 is located inside the mounting unit 16. Specifically, the control unit 30 includes a CPU (Central Processing Unit), a memory unit, a storage device, and a timer, functioning as a computer. The control unit 30 can control not only the motor 22 but also the operation of various parts of the nail machine 10. The memory unit or storage device stores various data, including programs executed by the CPU. A portion of the memory unit can be loaded with the program.

[0036] <Battery>

[0037] Battery 32 is connected to mounting part 16. In other words, battery 32 is an example of a power supply unit that can be connected to housing 11. With battery 32 connected to housing 11, the 5V generation circuit 74 (described later) Figure 6 Power is supplied to the battery 32 and the switching unit 40. The battery 32 is a DC power source and has multiple battery cells. These battery cells are, for example, lithium-ion batteries, nickel-metal hydride batteries, lithium-ion polymer batteries, nickel-cadmium batteries, etc.

[0038] <Switching section>

[0039] Switching unit 40 connects the 5V generation circuit 74 (described later) Figure 6 The switching unit 40 switches its operating state to either a supply state or a stop state. The switching unit 40 includes at least a switch unit 43, a cut-off circuit 72, a differentiating circuit 73, a branch circuit 75, and transistors T1 and T2.

[0040] <<Operating Section and Switch Section>>

[0041] The switch unit 43 switches between on and off states by the operator operating the operating unit 41. As an example, the switch unit 43 has a push-button switch PS (…). Figure 6 ) and trigger switch TS ( Figure 6 ).

[0042] As an example, the operating unit 41 includes a push rod 42 and a trigger 44. When the push rod 42 is pressed by contacting the object material G, the push rod 42 is in the OFF state. Similarly, when the trigger 44 is pressed by the operator's finger, the trigger 44 is in the OFF state. When the pressure applied to the push rod 42 is released, the push rod 42 is in the OFF state. Likewise, when the pressure applied to the trigger 44 is released, the trigger 44 is in the OFF state. Alternatively, the operating unit 41 may only have the push rod 42. In the OFF state of the push rod 42, pressing the switch PS (… Figure 6 When push rod 42 is in the open state, press switch PS is in the closed state. When trigger 44 is in the closed state, trigger switch TS ( Figure 6 When trigger 44 is in the off state, trigger switch TS becomes the off state.

[0043] <<<Push Rods and Push Switches>>>

[0044] The push rod 42 is separated from the handle 15 in the vertical direction. The lower end of the push rod 42 is located below the injection section 13. The push rod 42 is movable by abutting against the target material G. The push rod 42 abuts or disengages relative to the target material G by the operator moving the nail machine 10 (housing 11) in the vertical direction. Thus, the on and off states of the push rod 42 are switched. "Push rod 42 abutting against the target material G" means that the lower end of the push rod 42 abuts against the target material G.

[0045] Specifically, when the lower end of push rod 42 is in contact with the object material G, push rod 42 moves upward due to a reaction force from the object material G, thus entering the connected state. When the lower end of push rod 42 leaves the object material G, push rod 42 moves downward due to the force of a spring (not shown), thus entering the disconnected state.

[0046] Figure 6 The push-button switch PS shown is an example of the switch unit 43. When the push-button switch PS is in the ON state, it can energize path K3 (described later); when it is in the OFF state, it cannot energize path K3. Furthermore, the push-button switch PS serves as both the switch for starting the control unit 30 and the switch for actuating the motor 22, but essentially actuates the motor 22. The SW state detection circuit 76 (described later) sends signals indicating the ON and OFF states of the push-button switch PS to the control unit 30. The SW state detection circuit 88 sends signals indicating the ON and OFF states of the trigger switch TS to the control unit 30.

[0047] <<<Triggers and Trigger Switches>>>

[0048] like Figure 1 As shown, trigger 44 is located on handle 15. Trigger 44 is operated by the operator. Specifically, trigger 44 is moved upward by the operator's finger holding handle 15. At this time, trigger switch TS ( Figure 6 The trigger 44 is in the ON state. Additionally, a spring (not shown) is provided in trigger 44. Trigger 44 moves downwards due to the force of this spring. At this time, trigger switch TS is in the OFF state. Thus, push rod 42 and push switch PS ( Figure 6 The trigger 44 and the trigger switch TS are operated indirectly or directly by the operator.

[0049] <<Settings of the Switching Unit>>

[0050] An example of the setting of the switching unit 40 will be explained. In the 5V generation circuit 74 ( Figure 6 When the state of the push rod 42 is in the stopped state and it switches from the off state to the on state, the switching unit 40 will switch the 5V generation circuit 74 ( Figure 6 The state of the 5V generation circuit 74 changes from the stopped state to the supplied state. In other words, when push rod 42 changes from the off state to the on state, it switches the state of the 5V generation circuit 74 from the stopped state to the supplied state. Even if push rod 42 remains on, after a first predetermined time TA ( Figure 7 When the switching unit 40 switches the state of the 5V generation circuit 74 from the supply state to the stop state, the switching unit 40 switches the state of the 5V generation circuit 74 from the supply state to the stop state.

[0051] "First predetermined time TA" is the time at which the boundary value for determining whether the power supply from the battery 32 has been properly provided is determined when the push lever 42 is in the on state. It is a time preset in the control unit 30. The first predetermined time TA is from the push lever 42 (press switch PS) Figure 6 Set the elapsed time since the connection is turned on, for example, set it to a time between 5 and 10 minutes.

[0052] Other structures of a nailing machine

[0053] Figure 2 The internal structure of the nailing machine 10 is shown. The nailing machine 10 has a housing in the cylindrical section 12 ( Figure 1 The components include the hoisting gear 26, plunger 34, drive blade 36, spring 37, and counterweight 38.

[0054] like Figure 3 As shown, in motor 22 ( Figure 1 When driven, the hoisting gear 26 rotates in the third direction indicated by arrow B3. When the motor 22 stops, the hoisting gear 26 can rotate in a fourth direction opposite to the third direction. The fourth direction is indicated by arrow B4.

[0055] The hoisting gear 26 includes three gears: a first gear 27 located in the lower section, a second gear 28 located in the middle section, and a third gear 29 located in the upper section. The first gear 27, the second gear 28, and the third gear 29 are rotatably mounted on the retaining plate 21 (see reference). Figure 1 The first gear 27 meshes with the second gear 28, and the second gear 28 meshes with the third gear 29.

[0056] A first cam roller 45 is disposed on the front side of the first gear 27 at a position eccentric to its rotation axis. A second cam roller 46 and a third cam roller 47 are disposed on the front side of the second gear 28 at positions eccentric to its rotation axis. A fourth cam roller 48 and a fifth cam roller 49 are disposed on the front side of the third gear 29 at positions eccentric to its rotation axis. Each cam roller is capable of both revolving around and rotating on its own axis relative to its respective rotation axis.

[0057] like Figure 1 As shown, a top support 52 is fixed to the upper part of the cylindrical section 12. A bottom support 54 is fixed to the lower part of the cylindrical section 12. A guide rod 56 is provided between the top support 52 and the bottom support 54. The upper end of the guide rod 56 is fixed to the top support 52. The lower end of the guide rod 56 is fixed to the bottom support 54.

[0058] like Figure 3 As shown, two guide rods 56 are spaced apart in the left-right direction. A guide shaft 58 is disposed between the two guide rods 56. The upper end of the guide shaft 58 is fixed to the top bracket 52. The lower end of the guide shaft 58 is fixed to the bottom bracket 54. A plunger 34 and a counterweight 38 are disposed between the two guide rods 56.

[0059] The plunger 34 is movable vertically along the guide shaft 58 and guide rod 56. The actuator blade 36 is fixed to the plunger 34. The actuator blade 36 is movable vertically together with the plunger 34. The lower end of the actuator blade 36 extends from the cylinder 12 ( Figure 1 ) protrudes downwards, and can strike the ejection part 13 by moving downwards. Figure 1 The nail N is struck by a plunger 34 and a driver blade 36. The counterweight 38 reduces the reaction force when the striking part 33 strikes the nail N.

[0060] A spring 37 is disposed between the plunger 34 and the counterweight 38. The upper end of the spring 37 is fixed to the counterweight 38. The lower end of the spring 37 is fixed to the plunger 34. The spring 37 is, for example, a compression coil spring. The spring 37 exerts a downward force on the plunger 34 and an upward force on the counterweight 38.

[0061] A lower bumper 55 is provided between the bottom bracket 54 and the plunger 34. An upper bumper 59 is provided between the top bracket 52 and the counterweight 38.

[0062] The guide shaft 58 is inserted through the lower bumper 55, plunger 34, spring 37, counterweight 38, and upper bumper 59. A first rack 62 and a second rack 63 are fixed to the plunger 34.

[0063] The first cam roller 45 can engage with the first rack 62. The second cam roller 46 and the third cam roller 47 can engage with the second rack 63. The first cam roller 45, the second cam roller 46 and the third cam roller 47 can engage with the plunger 34 via the first rack 62 or the second rack 63.

[0064] A third rack 64 is fixed to the counterweight 38. The fourth cam roller 48 and the fifth cam roller 49 can engage with the third rack 64. The fourth cam roller 48 and the fifth cam roller 49 rotate while engaged with the counterweight 38 via the third rack 64, thereby causing the counterweight 38 to move downward.

[0065] like Figure 4 As shown, a latch 66 is mounted on the guide rod 56 on the left side. The latch 66 is rotatable relative to the guide rod 56 about a support shaft 68. The support shaft 68 is located within the configuration range of the third gear 29 in the vertical direction. The latch 66 is subjected to a clockwise force by a torsion coil spring.

[0066] The latch 66 has a hook 66A and an arm 66B. The hook 66A and arm 66B are positioned along the length of the latch 66, separated by a support shaft 68. The hook 66A can engage and disengage with a locking pin 69 provided on the counterweight 38. The arm 66B can contact and disengage with the plunger 34. Furthermore, both the counterweight 38 and the striking part 33 are wound by a winch gear 26, causing them to move in tandem.

[0067] exist Figure 2 The image shows the plunger 34 in the standby position (first position). Figure 4 The image shows the plunger 34 in the top dead center (second position). Figure 5 The image shows the state of plunger 34 at the bottom dead center (third position).

[0068] like Figure 2 , Figure 4 and Figure 5 As shown, with the striking part 33 engaged with the hoisting gear 26, the hoisting gear 26 rotates, thereby causing the striking part 33 to overcome the force of the spring 37 and move from the standby position to the top dead center. Furthermore, by disengaging from the hoisting gear 26 at the top dead center, the striking part 33 can perform the action of moving from the top dead center to the bottom dead center and striking the nail N by the force of the spring 37.

[0069] <Circuit Block Diagram>

[0070] Figure 6 This is a circuit block diagram of the nailing machine 10. Furthermore, the same reference numerals are used for the structures already described, and descriptions are omitted. The nailing machine 10 has a main circuit section 70. A battery 32 supplies power to the main circuit section 70 via a connector 18 provided in the mounting section 16.

[0071] <<Main Circuit Section>>

[0072] The main circuit section 70 includes a control section 30, a cut-off circuit 72, a differentiating circuit 73, a 5V generation circuit 74, a branch circuit 75, SW status detection circuits 76 and 88, a delay circuit 78, a battery status detection circuit 82, a control signal output circuit 84, and an inverter circuit 86. Furthermore, the main circuit section 70 includes a push-button switch PS, a trigger switch TS, resistors R1, R2, R3, capacitors C1 and C2, diodes D1, D2, D3, D4, and ZD, and transistors T1, T2, T3, T4, T5, and T6.

[0073] Additionally, the current path extending from connector 18 to inverter circuit 86 is designated as path K1. The current path extending from connector 18 to 5V generation circuit 74 is designated as path K2. The current path equipped with push-button switch PS is designated as path K3. Path K3 is an example of the first path. In path K3, power can be supplied to 5V generation circuit 74 by the flow of current. The current path extending from control unit 30 to transistor T3 is designated as path K4. The current path connecting path K2 to path K3 via transistor T4 and diode D1 is designated as path K5. Path K5 is an example of the second path. The current path extending from SW status detection circuit 76 to control unit 30 is designated as path K6.

[0074] The current path branching from path K2 and extending to transistor T5 is designated as path K7. The current path extending from battery state detection circuit 82 to control unit 30 is designated as path K8. The current path extending from control unit 30 to transistor T6 is designated as path K9. The current path extending from SW state detection circuit 88 to control unit 30 is designated as path K10. The current path extending from trigger switch TS to SW state detection circuit 88 is designated as path K11. Furthermore, the current paths other than those from path K1 to path K11 are simply referred to as "current paths".

[0075] The emitter E of transistor T1 is grounded. The base B of transistor T1 is electrically connected to the push-button switch PS via path K3. The collector C of transistor T1 is connected to the base B of transistor T2 and the SW state detection circuit 76. Transistor T2 is located in path K2 between the cut-off circuit 72 and the 5V generation circuit 74. The collector C of transistor T2 is connected to the 5V generation circuit 74. The emitter E of transistor T2 is connected to path K2.

[0076] The base B of transistor T3 is connected to the control unit 30. The emitter E of transistor T3 is grounded. The collector C of transistor T3 is connected to the base B of transistor T4. The emitter E of transistor T4 is connected to path K2. The collector C of transistor T4 is connected to path K3.

[0077] The base B of transistor T5 is connected to path K7. The collector C of transistor T5 is connected to battery state detection circuit 82. The emitter E of transistor T5 is connected. The base B of transistor T6 is connected to control unit 30. The emitter E of transistor T6 is grounded.

[0078] Diode D1 is located between transistor T4 and path K3 (press switch PS). Diode D2 is located between transistor T1 and transistor T2. Diode D3 is located between the SW state detection circuit 76 and the collector C of transistor T1. Diode D4 is connected between transistor T2 and diode D2, and between transistor T3 and transistor T4. Diode ZD is located in path K7.

[0079] Switching unit 40 ( Figure 1 The circuit includes a cut-off circuit 72. The cut-off circuit 72 is connected in series in path K3 upstream of the push switch PS, and is configured to cut off the current in path K3. A second predetermined time TB elapses after the push rod 42 (push switch PS) switches from the off state to the on state. Figure 7 In the event of a certain condition, the cutting-off circuit 72 cuts off the current in path K3. The cutting-off circuit 72 includes a differentiating circuit 73.

[0080] "Second Preset Time TB" is a time shorter than the first preset time TA, and is a time preset in the control unit 30. The second preset time TB is, for example, set to "several seconds".

[0081] <<<<Differential Circuits>>>>

[0082] The differentiating circuit 73 is a circuit connected in series with path K2 and path K3. As an example, the differentiating circuit 73 is composed of a resistor R1 and a capacitor C1 connected in parallel. The differentiating circuit 73 can set the second predetermined time TB that passes through the cut-off circuit 72 to the time at the moment of the pulse wave shape. This is because, even if charge accumulates in the capacitor C1, the charge of the capacitor C1 flows out through the resistor R1.

[0083] <5V generation circuit>

[0084] The 5V generation circuit 74 is an example of the power supply unit. The 5V generation circuit 74 generates a 5V DC voltage based on the output voltage of the battery 32 and supplies power (power supply voltage) equivalent to 5V to the control unit 30, the SW state detection circuits 76, 88, and the battery state detection circuit 82. In addition, the 5V generation circuit 74 can switch between the power supply state of supplying power to the control unit 30 and the stop state of not supplying power to the control unit 30. The 5V generation circuit 74 becomes the power supply state by supplying the power of the battery 32 through path K2 when the transistor T2 is in the on state, and becomes the stop state by not supplying the power of the battery 32 from path K2 when the transistor T2 is in the off state. Figure 6 The display of "5V" refers to the voltage generated in the 5V generation circuit 74.

[0085] <<<Branch circuit>>>

[0086] The switching unit 40 includes a branch circuit 75. The branch circuit 75 can switch the presence or absence of the cut-off of the current in path K5 that is electrically connected in parallel with the cut-off circuit 72. As an example, the branch circuit 75 includes transistors T3, T4, and a diode D1. When a power hold (POWERKEEP) signal is sent from the control unit 30, the branch circuit 75 does not cut off the current in path K5, and when the power hold signal is not sent from the control unit 30, the branch circuit 75 cuts off the current in path K5.

[0087] The "power hold signal" is a signal for the control unit 30 to indicate whether to maintain the power supply voltage of 5V supplied by the 5V generation circuit 74. When the power hold signal is on, it means that the control unit 30 issues an instruction to supply the power supply voltage. When the power hold signal is off, it means that the control unit 30 issues an instruction to stop supplying the power supply voltage.

[0088] <<<SW state detection circuit>>>

[0089] When the push switch PS is in the on (connected) state, the on state of the push switch PS is detected by using the change in the voltage in the SW state detection circuit 76 as the current flows from the collector C to the emitter E of the transistor T1.

[0090] Furthermore, in the SW state detection circuit 76, when the push switch PS is in the off (disconnected) state, current does not flow from the collector C to the emitter E of the transistor T1, and the voltage in the SW state detection circuit 76 does not change, thereby detecting the off state of the push switch PS. In addition, the information on the on and off states of the push switch PS detected by the SW state detection circuit 76 is sent to the control unit 30.

[0091] In the SW state detection circuit 88, the on (connected) state and off (disconnected) state of the trigger switch TS (described later) are detected based on the presence or absence of power in the SW state detection circuit 88. Furthermore, the on / off state information of the trigger switch TS detected by the SW state detection circuit 88 is sent to the control unit 30.

[0092] <<<Delay Circuits>>>

[0093] As an example, the delay circuit 78 includes resistors R2 and R3 and capacitor C2. Furthermore, in this embodiment, transistor T5 is included in the delay circuit 78. When the battery 32 is connected to the housing 11, power is supplied to path K7 via diode ZD. Here, the delay circuit 78 delays the time until the power supplied to path K7 reaches the base B (gate) of transistor T5. That is, when the battery 32 is connected to the mounting portion 16, there is a timing delay in the delay circuit 78 for transistor T5 to become in the on state. The delay circuit 78 is used to distinguish between the case where the battery 32 is connected to the housing 11 after the push-button switch PS has become on, and the case where the push-button switch PS has become on after the battery 32 is connected to the housing 11.

[0094] <<<Battery Status Detection Circuit>>>

[0095] The battery status detection circuit 82 is an example of a detection circuit used to detect the presence or absence of the battery 32. The battery status detection circuit 82 detects whether the battery 32 is connected to the housing 11 (mounting part 16). Specifically, the battery status detection circuit 82 detects whether a first predetermined time TA has elapsed since detecting that the battery 32 is connected to the housing 11. Figure 7 Short third scheduled time TC ( Figure 8 In the case of ( ), a battery detection signal is sent to the control unit 30. In addition, when the transistor T5 is turned on and the voltage obtained by the battery status detection circuit 82 is 0V, it determines that a battery 32 is connected to the casing 11 and sends a battery detection signal (battery present) to the control unit 30.

[0096] <<<Control Signal Output Circuit>>>

[0097] The control signal output circuit 84 activates the inverter circuit 86 based on instructions from the control unit 30.

[0098] <<<Inverter Circuits>>>

[0099] The inverter circuit 86 converts the direct current supplied from the battery 32 into alternating current and supplies it to the motor 22. Furthermore, as an example, the inverter circuit 86 includes switching elements S1, S2, and S3.

[0100] <<<Trigger Switch>>>

[0101] The trigger 44 of the trigger switch TS is grasped (pressed) by the operator. In this case, it becomes the ON state. In addition, when the pressure applied to the trigger 44 is released, the trigger switch TS becomes the OFF state.

[0102] <Processing performed by the control department>

[0103] Figure 6 The control unit 30 shown is in operation for a second predetermined time TB from the start of power supply from the 5V generation circuit 74. Figure 7 During the period, the control unit 30 sends an on signal to the switching unit 40 so that the switching unit 40 sets the state of the 5V generation circuit 74 to the supply state. Specifically, during the period from the start of power supply from the 5V generation circuit 74 until the second predetermined time TB has elapsed, the control unit 30 sends a power holding signal to the branch circuit 75 via path K4.

[0104] After the control unit 30 sends an on signal to the switching unit 40, if the on and off states of the switching unit 43 have not switched before a first predetermined time TA, the control unit 30 stops sending on signals to the switching unit 40. Additionally, after initial settings are completed, the control unit 30 powers on the base B of the transistor T6 via path K9.

[0105] If the trigger 44 is activated while the push rod 42 is activated first, the control unit 30 drives the motor 22. However, the control unit 30 is configured not to drive the motor 22 even if the push rod 42 is activated while the trigger 44 is activated first.

[0106] [Explanation of comparative examples]

[0107] As a comparative example with respect to the nailing machine 10 of this embodiment, a structure without the differential circuit 73 (in other words, a structure in which the push switch PS is directly connected to the connector 18) will be described. Furthermore, illustrations of the comparative example structure are omitted.

[0108] In the configuration without the differentiating circuit 73, when the push switch PS is kept in the ON state, the power (current) supplied from the battery 32 continuously flows to ground via the push switch PS. During this phase, the current is wasted.

[0109] Furthermore, the control unit 30 continues to operate while the push-button switch PS remains in the ON state. In this comparative example, if, for example, 15 minutes have passed since the control unit 30 was activated, the control unit 30 performs a shutdown process that turns transistor T3 off. In this case, if the push-button switch PS remains ON, even if the control unit 30 turns transistor T3 off, transistor T2 remains ON due to the current flowing from the push-button switch PS. Therefore, the control unit 30 cannot be turned off. Thus, in the structure of the comparative example, power (current) is wasted.

[0110] [The function of a nail machine]

[0111] Reference Figure 6 The function of the nailing machine 10 in this embodiment will be explained. Regarding the structure of the nailing machine 10... Figure 6 Structures not shown in the diagram, refer to Figures 1 to 5 Individual drawing numbers are omitted. Furthermore, in the control unit 30, the CPU reads the processing program from the memory unit, expands it in a part of the memory and executes it, thereby performing various processes performed by the nailing machine 10.

[0112] <Functions related to differentiating circuits and branching circuits>

[0113] Here, we will focus on explaining the differentiating circuit 73 and the branching circuit 75.

[0114] <<Startup of the Control Unit>>

[0115] When the switch PS is pressed and turned on (connected), power is supplied from the battery 32 via the differentiating circuit 73, thereby turning on the transistor T1 momentarily (during the second predetermined time TB). In other words, the differentiating circuit 73 causes a pulse waveform current to flow instantaneously to the transistor T1.

[0116] Transistor T1 and transistor T2 are instantly switched on, and power from battery 32 is supplied to 5V generation circuit 74 via path K2. Furthermore, 5V power (power supply voltage) is supplied from 5V generation circuit 74 to control unit 30. Thus, control unit 30 is instantly switched on (start-up state).

[0117] The control unit 30 operates from the initial power supply from the 5V generation circuit 74 to the second on state TB. Figure 7During the period up to (instantaneously), a power holding signal is sent to branch circuit 75 (transistor T3) via path K4. Therefore, even if transistor T1, which is instantaneously on, immediately becomes off, transistor T2 can remain on because transistor T3 is on. That is, the start-up state of control unit 30 can continue.

[0118] Here, as a comparative example, in a structure that has only a differentiating circuit 73 and no branch circuit 75, even if the push switch PS is set to the ON state, the transistor T1 can only be set to the ON state during the second predetermined time TB.

[0119] On the other hand, the nailing machine 10 in this embodiment not only has a differentiating circuit 73, but also a branching circuit 75, so that even if the transistor T1 is in the off state, the start-up state of the control unit 30 can continue. As a result, the 5V equivalent power supply from the 5V generation circuit 74 to each part is continuously provided.

[0120] <<Detection of the long press state of the push switch>>

[0121] In the control unit 30, the state in which the push-button switch PS is pressed for a long time (the state of continuous on operation) can be detected. Specifically, when the transistor T3 is in the on state (operation state), current flows from the collector C of the transistor T3 to the emitter E, thereby turning the transistor T4 into the on state (operation state) and supplying power to the push-button switch PS.

[0122] That is, even if only a momentary power supply is provided through the differential circuit 73, when the control unit 30 is in the on state, the power of the battery 32 is also supplied to the push switch PS via the branch circuit 75. In this way, since the branch circuit 75 is provided in the nail machine 10, the push switch PS can be detected to be pressed for a long time in the SW state detection circuit 76.

[0123] <<The action of driving in a nail>>

[0124] When the push switch PS is in the ON state and the trigger switch TS is in the ON state, the control unit 30 drives the motor 22 to perform the nailing action N. However, when the push rod 42 is in the ON state and the trigger 44 is in the ON state, the nailing machine 10 allows the motor 22 to be driven, but when the push rod 42 is in the ON state after the trigger 44 is in the ON state, the motor 22 is not allowed to be driven.

[0125] On the other hand, when at least one of the push switch PS and the trigger switch TS is in the off state, the control unit 30 does not allow the motor 22 to be driven.

[0126] In this nailing machine 10, since a differential circuit 73 is provided before the pressing switch PS, the power supply in path K3 can be cut off at the very beginning (second predetermined time TB) even if the pressing switch PS is pressed for a long time. Therefore, compared with the structure of the comparative example described above, the power consumption of the nailing machine 10 can be reduced.

[0127] <<Shutting down the control unit>>

[0128] In the nail machine 10, if the state of the push switch PS remains unchanged for a period longer than a first predetermined time TA, the control unit 30 stops sending the power holding signal. Therefore, even when the push switch PS is in the ON state, transistor T3 and transistor T4 are both in the OFF state, resulting in transistors T1 and T2 being in the OFF state. Conversely, when the push switch PS is in the OFF state, transistor T3 is also in the OFF state, resulting in transistor T2 being in the OFF state. That is, by the branch circuit 75 being in the OFF state, transistor T2 is in the OFF state, and the 5V generation circuit 74 is stopped. As described above, even when the push switch PS remains in the ON state, the control unit 30 can switch the 5V generation circuit 74 from the supply state to the stop state. Therefore, the control unit 30 can be shut down, and thus, compared to the previously described comparative example where the control unit continues to operate, power consumption can be further reduced.

[0129] <On the function of delay circuits>

[0130] With battery 32 connected to casing 11, power is supplied from battery 32 to path K7 via diode ZD. Delay circuit 78 delays the time it takes for the power supplied to path K7 to reach the base B of transistor T5.

[0131] <<Battery connection precedes switch activation>>

[0132] With the push switch PS in the off state and the battery 32 connected to the casing 11, power from the battery 32 reaches the transistor T5 via the delay circuit 78, causing the transistor T5 to slowly turn on. At this point, the battery status detection circuit 82 has not yet detected the battery 32.

[0133] Here, when the switch PS is pressed and turned on, transistors T1 and T2 are momentarily turned on by the differential circuit 73. Then, the control unit 30 is activated. At the moment the control unit 30 is activated, transistor T5 is turned on, and the battery status detection circuit 82 detects the battery 32. Therefore, the control unit 30 determines that the battery 32 is connected to the casing 11. As a result, the control unit 30 allows the motor 22 to be driven. That is, the driving of the motor 22 can be started.

[0134] <<The push-button switch is activated before the battery is connected>>

[0135] Imagine the scenario where the push-button switch PS is pressed by the operator and becomes ON. In this state, with battery 32 connected to housing 11, power from battery 32 is supplied to the push-button switch PS and the delay circuit 78 approximately simultaneously. Here, on the delay circuit 78 side, the delay circuit 78 slowly becomes ON, so transistor T5 does not immediately become ON.

[0136] On the other hand, on the cut-off circuit 72 side, via the differentiating circuit 73, pressing the switch PS momentarily turns it on, transistors T1 and T2 turn on, thereby activating the control unit 30. Thus, the control unit 30 is activated before transistor T5 turns on.

[0137] At the start-up point of the control unit 30, transistor T5 is not in the ON state, therefore the battery status detection circuit 82 sends a "no battery" signal to the control unit 30. That is, when the control unit 30 starts up, it determines that the battery 32 is not connected to the casing 11 and does not allow the motor 22 to be driven. Therefore, even if the switch PS and the trigger switch TS are both ON at this point, the motor 22 remains in the OFF state.

[0138] <The effect upon completion of initial settings>

[0139] After startup, the control unit 30 sends a "initial setting complete" signal to the base B of transistor T6 at the point when the determination of the presence or absence of battery 32 is completed. As a result, transistor T6 is activated, and the charge stored in capacitor C2 is released.

[0140] As a comparative example, in the structure where charge is stored in capacitor C2 each time battery 32 is inserted or removed (disconnection and connection actions), the delay circuit 78 does not operate, and the battery status detection circuit 82 may malfunction. That is, it may fail to correctly detect the presence or absence of battery 32.

[0141] On the other hand, in the nail machine 10 of this embodiment, at the time point when the initial setting is completed, the control unit 30 activates the transistor T6, thereby releasing the charge from the capacitor C2. Therefore, the transistor T5 operates normally, enabling the battery status detection circuit 82 to operate correctly, and thus the control unit 30 can accurately detect the presence or absence of the battery 32.

[0142] <Charts showing the situation where the switch is pressed after the battery is connected>

[0143] Figure 7 The nailing machine 10 of this embodiment is shown in the figure. Figure 1This is a timing diagram showing the time changes of each item from time point t1 to time point t6 when the switch PS is pressed and held down after battery 32 is connected. Time points t1 to t6 are arranged in numerical order, but the intervals between time points are not fixed. Furthermore, time point t2 to t6 corresponds to the first predetermined time TA. Time point t2 to t3 corresponds to the second predetermined time TB. For details regarding the structure of the nailing machine 10, please refer to... Figures 1 to 6 Some drawing numbers are omitted.

[0144] exist Figure 7 In the example, the battery voltage, PS voltage, 5V voltage, power hold, branch voltage, and PS switching are shown.

[0145] "Battery voltage" refers to the voltage of connector 18. "PS voltage" refers to the voltage at the location between switch PS and transistor T1 in path K3. "5V voltage" refers to the voltage generated by the 5V generation circuit 74. "Power hold" refers to the on / off state of the power hold signal sent from control unit 30.

[0146] "Branch voltage" refers to the voltage at the base (B) of transistor T4. "PS switching" refers to the switching of the voltage input to the base (B) of transistor T1. In other words, "PS switching" refers to the on / off state of the pressed switch PS. Furthermore, Figure 7 The voltages VA, VB, VC, VD, VE, VF, and VG shown are only used to distinguish between the voltages, and their order is basically unrelated to the magnitude of the voltages.

[0147] In the battery voltage, up to time point t1, the voltage is VA. After time point t1 when battery 32 is connected, the voltage rises from VA to VB.

[0148] In the PS voltage, up to time t2, the voltage is VC. When the PS switch is turned on by pressing, the voltage rises from VC to VE. From time t2 to time t3, the PS voltage drops from VE to VD (>VC), but after time t3, it rises again to VE. At time t5, when the power holding signal is off, the PS voltage starts to drop from VE and becomes VC at time t6.

[0149] At 5V, the voltage is 0V up to time t2. When the switch PS is pressed, the voltage rises from 0V to 5V. Then, at time t5, the power holding signal is disconnected, causing the voltage to drop from 5V to 0V at time t6.

[0150] During power holding, the circuit is disconnected before time point t3 and connected from time point t3 to time point t5. Then, the power holding is turned off at time point t5.

[0151] In the branch voltage, the voltage is VF up to time t3, and rises to VG at time t3. The branch voltage remains at VG from time t3 to time t5, but drops to VF after time t5.

[0152] During PS switching, the device switches from the off state to the on state at time t2, and then switches back to the off state at time t6, after a first predetermined time TA has elapsed from time t2. It then remains in the off state. When the control unit 30 turns off the power holding signal at time t5, the PS switching returns to the off state at time t6. Therefore, time t6 can also be considered the forced termination time of the control unit 30.

[0153] exist Figure 8 The diagram shows the time changes of various items from time point t1 to time point t6 when the switch PS is pressed continuously after the battery 32 is connected. It shows the battery voltage, PS voltage, 5V voltage, battery detection voltage, battery presence / absence, and initial setting completion. Time point tA is defined as the time point after t1 and before t2. The time from t1 to tA corresponds to the third predetermined time TC. Furthermore, the battery voltage, PS voltage, and 5V voltage... Figure 7 Since they are the same, the explanation is omitted.

[0154] "Battery detection voltage" refers to the voltage input to the base B of transistor T5. Regarding the information sent from the battery status detection circuit 82 to the control unit 30, the state where the battery 32 is connected to the casing 11 is set to "yes," and the state where the battery 32 is not connected to the casing 11 is set to "no." "Battery presence or absence" refers to the presence or absence of the battery 32. "Initial setting completed" means that the control unit 30 sets "completed" when it determines that it can drive the motor 22, and sets "not completed" when it determines that it cannot drive the motor 22, indicating the state of preparation for driving the motor 22.

[0155] In the battery voltage detection, the voltage up to time point t1 is VH. After battery 32 is connected at time point t1, the voltage rises from VH to voltage VI and then to voltage VJ up to time point tA. During the period when battery 32 is connected, voltage VJ is maintained even after time point t6.

[0156] In the presence or absence of batteries, there are no batteries up to time point t2, batteries are present from time point t2 to time point t4, and there are no batteries after time point t4.

[0157] During the initial setup process, up to time point t4, the initial setup is in an "incomplete" state. After time point t4, the initial setup is in a "complete" state.

[0158] <Charts showing battery connection after the push switch is pressed>

[0159] exist Figure 9 The diagram shows the time changes of various items from time point t1 to time point t6 when the battery 32 is connected to the casing 11 after the push-button switch PS is pressed. It shows the battery voltage, PS voltage, 5V voltage, battery detection voltage, battery presence / absence, and initial setup completion. Time point tB is defined as the time point after time point t4 and before time point t5. Additionally, the PS voltage and 5V voltage are... Figure 7 Since they are the same, the explanation is omitted.

[0160] In the battery voltage, up to time point t2, the voltage is VA. After time point t2 when battery 32 is connected, the voltage rises from VA to VB.

[0161] In the battery detection voltage, the voltage is VH up to time point t2. After time point t2 when battery 32 is connected, the voltage rises from VH to voltage VI and then to voltage VJ up to time point tB. During the period when battery 32 is connected, voltage VJ is maintained even after time point t6. Time point tB is after time point t4, therefore, the initial setting is completed in the control unit 30 before the battery detection voltage reaches voltage VJ.

[0162] In the presence or absence of a battery, since it was determined that there was no battery 32 before time point t2, the entire time including the period from time point t1 to time point t6 is considered as having no battery.

[0163] During the initial setup process, up to time point t4, the system enters an "incomplete" state, indicating that the initial setup is not yet complete. After time point t4, it enters a "complete" state, indicating that the initial setup is complete. Thus, the initial setup is completed before time point t2 when it is determined that there is no battery 32. Therefore, even if the operator turns on the trigger switch TS thereafter, the control unit 30 will not allow the motor 22 to be driven.

[0164] also, Figure 7 , Figure 8 as well as Figure 9 This is an example illustrating the time variation of each item. That is, the time variation of each item is not limited to... Figure 7 , Figure 8 as well as Figure 9 The trend of change shown.

[0165] <Summary of the effects of this implementation method>

[0166] The following is for reference Figures 1 to 9 The function of the nailing machine 10 is summarized here. Additionally, details regarding individual drawing numbers for the various structures of the nailing machine 10 are omitted.

[0167] In the supply state, when power is supplied from the 5V generation circuit 74, the control unit 30 of the nail machine 10 controls the drive of the motor 22. In the stop state, when power is not supplied from the 5V generation circuit 74, the switching unit 40 switches the state of the 5V generation circuit 74 from the stop state to the supply state when the switching unit 43 switches from the off state to the on state. In other words, when the push rod 42 switches from the off state to the on state, it switches the state of the 5V generation circuit 74 from the stop state to the supply state.

[0168] Here, even when the switch 43 remains on, after a first predetermined time TA has elapsed, the switching unit 40 switches the state of the 5V generation circuit 74 from the supply state to the stop state. This reduces the power consumption of the 5V generation circuit 74. In other words, it improves the convenience of the nail machine 10.

[0169] In the nail machine 10, the cutting-off circuit 72 of the switching unit 40 cuts off the current in the path K3 after a second predetermined time TB has elapsed since the switch unit 43 switched from the off state to the on state. Therefore, even when the switch unit 43 remains on, cutting off the path K3 can switch the state of the 5V generation circuit 74 to the stop state, thus further reducing the power consumption in the 5V generation circuit 74.

[0170] In the nail machine 10, the second predetermined time TB that elapses in the cutting circuit 72 can be set to a more instantaneous time in the shape of a pulse wave, thus allowing the second predetermined time TB to be set to a shorter time. Furthermore, compared to a structure where the processing performed by the cutting circuit 72 is achieved through control by the control unit 30, the possibility of normal control failing due to malfunctions of the control unit 30 can be reduced.

[0171] In the nail machine 10, the control unit 30 sends an on signal to the switching unit 40 during the period from the start of power supply to the elapsed second predetermined time TB. As a result, even if the current is cut off by the cutting-off circuit 72, the switching unit 40 sets the state of the 5V generation circuit 74 to the supply state, thus maintaining the power supply to the control unit 30.

[0172] In the nail machine 10, when no power hold signal (on signal) is sent from the control unit 30, the branch circuit 75 cuts off the current in path K5. At this time, no current flows through the differentiating circuit 73. Therefore, even if the switch PS (switch unit 43) is pressed and is in the on state, no current flows through path K3.

[0173] On the other hand, when the power holding signal is sent from the control unit 30, the branch circuit 75 does not cut off the current in path K5. That is, if the switch 43 is in the ON state, the current will still flow through path K3 even if the current is cut off by the cut-off circuit 72. Therefore, if the switch 43 remains in the ON state for a long time and the current is cut off by the cut-off circuit 72, the control unit 30 can be prevented from mistakenly judging that the switch 43 has become OFF midway.

[0174] In the nailing machine 10, if an abnormal state occurs in which the on and off states of the switch unit 43 are not switched, the control unit 30 stops sending on signals to the switching unit 40, thus preventing the control unit 30 from continuously sending on signals to the switching unit 40 unnecessarily.

[0175] Consider the following structure for the nailing machine 10: it has a push rod 42 and a trigger 44. When the push rod 42 is turned on first, the trigger 44 is turned on, driving the motor 22; when the sequence is reversed, the motor 22 is not driven. In this structure, the 5V generation circuit 74 is in a supplied state at the moment the push rod 42 is turned on, thus the control unit 30 can be quickly activated during the operation of driving the motor 22, resulting in smooth operation. Conversely, when the trigger 44 is turned on first, the motor 22 is not driven, and there is no need to activate the control unit 30 at the moment the trigger 44 is turned on. Therefore, by removing the function required as part of the switching unit 40 from the trigger 44, the circuitry of the nailing machine 10 can be simplified.

[0176] In the nailing machine 10, when a third predetermined time TC has elapsed after detecting that the battery 32 is connected to the housing 11, the battery status detection circuit 82 sends a detection signal to the control unit 30. Here, the battery 32 is connected to the housing 11, and immediately after the battery status detection circuit 82 detects the connection of the battery 32 (before the third predetermined time TC has elapsed), the battery 32 is disconnected from the housing 11. In this case, the battery status detection circuit 82 can detect that the battery 32 is not connected to the housing 11, thus suppressing false detections in the battery status detection circuit 82.

[0177] [Variation Example]

[0178] This embodiment is not limited to the above-described embodiment, and various modifications can be made without departing from its spirit. Hereinafter, variations of this embodiment will be described.

[0179] In the nail machine 10, the cutting-off circuit 72 may not be provided. Furthermore, the cutting-off circuit 72 can be any circuit capable of sending a pulse-wave-shaped signal to the transistor T1, and can be any circuit other than the differentiating circuit 73. The control unit 30 may also refrain from sending an on signal to the switching unit 40 during the period from the start of power supply until the second predetermined time TB has elapsed.

[0180] The switching unit 40 may also be structured without the branch circuit 75. The control unit 30 may also switch the state of the 5V generation circuit 74 from the supply state to the stop state without stopping sending an on signal to the switching unit 40. The trigger switch TS and the push-button switch PS can be interchanged. Alternatively, the switching unit with the trigger switch TS may be separated from the switching unit 40 to replace the push-button switch PS. The battery status detection circuit 82 may also be omitted, and the control unit 30 may determine the presence or absence of the battery 32.

[0181] An AC adapter can also be used instead of battery 32. As an example, the AC adapter is connected to an external AC power source of the nail machine 10, converting AC power into DC power (e.g., DC 12V) and supplying it to the terminals of connector 18 of the nail machine 10.

[0182] The power supply unit is not limited to the 5V generation circuit 74. It can also be a circuit that generates voltages other than 5V.

[0183] The working machine is not limited to the nail driver 10, but can also be a machine that is operated by the rotation of other motors. As another example of a working machine, it can also be a drill bit used for hole drilling.

[0184] The first predetermined time TA can also be set to a time other than 5 minutes to 10 minutes. Furthermore, even when the push rod 42 remains in the ON state, other conditions can be set instead of the first predetermined time TA as the condition for the switching unit 40 (control unit 30) to switch the state of the 5V generation circuit 74 from the supply state to the stop state. For example, the switching unit 40 (control unit 30) can switch the state of the 5V generation circuit 74 from the supply state to the stop state if the drop in the output voltage of the battery 32 exceeds a predetermined threshold while the push rod 42 is in the ON state, or if the output voltage of the battery 32 is lower than a predetermined threshold when the push rod 42 is in the ON state.

[0185] Symbol Explanation

[0186] 10… Nail hammer, 11… Housing, 12… Cylinder, 13… Injection section, 14… Motor housing, 15… Handle, 16… Mounting section, 18… Connector, 19… Nail cartridge, 21… Retaining plate, 22… Motor, 24… Gearbox, 26… Hoisting gear, 27… First gear, 28… Second gear, 29… Third gear, 30… Control section, 32… Battery, 33… Impact section, 34… Plunger, 36… Driver blade, 37… Spring, 38… Counterweight, 40… Switching section, 41… Operating section, 42… Push rod, 43… Switch section, 44… Trigger, 45… First cam roller, 46… Second cam roller 47…Third cam roller, 48…Fourth cam roller, 49…Fifth cam roller, 52…Top support, 54…Bottom support, 55…Lower bumper, 56…Guide rod, 58…Guide shaft, 59…Upper bumper, 62…First rack, 63…Second rack, 64…Third rack, 66…Latch, 66A…Hook, 66B…Arm, 68…Support shaft, 69…Clamping pin, 70…Main circuit section, 72…Cut-off circuit, 73…Differential circuit, 74…5V generation circuit, 75…Branch circuit, 76…SW status detection circuit, 78…Delay circuit, 82…Battery status detection circuit, 84…Control Signal output circuit, 86…inverter circuit, 88…SW status detection circuit, B…base, C…collector, C1…capacitor, C2…capacitor, D1…diode, D2…diode, D3…diode, D4…diode, E…emitter, G…object material, K1…path, K2…path, K3…path, K4…path, K5…path, K6…path, K7…path, K8…path, K9…path, K10…path, K11…path, N…pin, PS…push-button switch, R1…resistor, R2…resistor, R3…resistor, S1…switching element, S2…switching element, S… 3…Switching element, T1…transistor, T2…transistor, T3…transistor, T4…transistor, T5…transistor, T6…transistor, t1…time point, t2…time point, t3…time point, t4…time point, t5…time point, t6…time point, tA…time point, tB…time point, TA…first predetermined time, TB…second predetermined time, TC…third predetermined time, TS…trigger switch, VA…voltage, VB…voltage, VC…voltage, VD…voltage, VE…voltage, VF…voltage, VG…voltage, VH…voltage, VI…voltage, VJ…voltage, ZD…diode.

Claims

1. A work machine, characterized in that, have: motor; The control unit controls the drive of the motor; The power supply unit is capable of switching between a supply state that supplies power to the control unit and a stop state that does not supply power to the control unit; as well as The switching unit switches the operating state of the power supply unit to either the supply state or the stop state. The switching unit includes a switch that allows the operator to switch between an on and off state. When the power supply unit is in the stopped state, and the switch unit switches from the disconnected state to the connected state, the switching unit switches the power supply unit from the stopped state to the supplied state. Even if the switch section maintains the on state, after a first predetermined time has elapsed, the switching section switches the state of the power supply section from the supply state to the stop state.

2. The work machine according to claim 1, characterized in that, The machine is equipped with a first path that allows power to be supplied to the power supply unit via the flow of electric current. The switch unit is capable of energizing the first path in the on state and is unable to energize the first path in the off state. The switching unit includes a cutting-off circuit, which is connected in series with the upstream side of the switching unit in the first path and is capable of cutting off the current in the first path. If a second predetermined time, shorter than the first predetermined time, has elapsed since the switch part switched from the off state to the on state, the cutting-off circuit cuts off the current in the first path.

3. The operating machine according to claim 2, characterized in that, The cut-off circuit includes a differentiating circuit.

4. The operating machine according to claim 2, characterized in that, During the period from the start of power supply from the power supply unit until the second predetermined time has elapsed, the control unit sends an activation signal to the switching unit so that the switching unit sets the state of the power supply unit to the supply state.

5. The operating machine according to claim 4, characterized in that, The switching unit includes a branch circuit that can switch between cutting off and not cutting off the current in the second path that is electrically connected in parallel with the cutting-off circuit. The branch circuit does not cut off the current of the second path when the control unit sends the turn-on signal, and cuts off the current of the second path when the control unit does not send the turn-on signal.

6. The operating machine according to claim 4, characterized in that, After sending the turn-on signal to the switching unit, if the turn-on state and the turn-off state of the switching unit have not switched before the first predetermined time has elapsed, the control unit stops sending the turn-on signal to the switching unit.

7. The operating machine according to any one of claims 1 to 6, characterized in that, The work machine includes: a trigger disposed on a handle held by the operator; and a push rod disposed separately from the handle, movable by contacting the work material. Specifically, the control unit activates the motor when the trigger is activated while the push rod is already engaged, but does not activate the motor even when the push rod is engaged while the trigger is already engaged. The switch unit becomes the ON state when the push rod is turned on.

8. The work machine according to claim 1, characterized in that, The work machine has: The main body includes the motor, the control unit, the power supply unit, and the switching unit; A power supply unit is connected to the main body and supplies power to the power supply unit and the switching unit when connected to the main body. as well as The detection circuit detects the connection status between the power supply unit and the main body unit. Specifically, the detection circuit sends a detection signal to the control unit when a third predetermined time, shorter than the first predetermined time, has elapsed since the connection between the power supply unit and the main body unit was detected.

9. A work machine, characterized in that, have: motor; The control unit controls the drive of the motor; The power supply unit is capable of switching between a supply state that supplies power to the control unit and a stop state that does not supply power to the control unit; as well as The switch unit allows the operator to switch between an on and off state. Specifically, when the switch unit switches from the off state to the on state, it switches the power supply unit from the off state to the supply state. Even when the switch unit maintains the on state, the control unit can switch the power supply unit from the supply state to the stop state.

Images