JP2008213068A - Power tool and its management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool having improved reliability in wireless communication with a management device, and also to provide its management system. <P>SOLUTION: The management system includes one or more power tools 1a and the management device 2 for managing operation conditions of the individual power tools 1a. The power tool 1a includes a motor 16 for turning a tool, a motor driving part 32 for exciting the motor 16, a motor control part 31a for controlling rotation of the motor 16 by means of the motor driving part 32, a wireless communication part 33 for wirelessly communicating operation information regarding operation contents with the management device 2 via an antenna 33a and a communication control part 31b for monitoring an operating condition of the motor 16 and starting the wireless communication of the operation information by the wireless communication part 33 when the motor is not working. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power tool mainly used in a factory or the like and a management system thereof.

  Conventionally, a plurality of power tools wirelessly transmit work information such as an identification number of each power tool, tightening torque, the number of screw tightening, work time, remaining battery power, etc. to the management device. A management system for recording and managing screw tightening work by an electric tool has been proposed (for example, see Patent Document 1).

  In the management system disclosed in the above-mentioned patent document, management information such as a torque setting value is transmitted from the management device to the electric tool, so that the management information is set for each electric tool, and the setting corresponding to the work content is managed. This can be done from the device side.

For example, when the power tool side transmits to the management device that the number of screw tightenings has reached a predetermined number in a certain work process, the management device determines that the work process has ended, and the torque setting value in the next work process Management information is transmitted to the power tool side, and even if the operator does not change the setting such as the torque setting value for each process, the settings are automatically updated, so workability is improved. There is an advantage.
JP 2000-334670 A (paragraphs [0011]-[0016] and FIGS. 1 and 2)

  In the management system configured as described above, when work information is transmitted and received between the power tool and the management device using a wireless signal, the communication line is connected to the power tool as compared to the wired communication method in which work information is transmitted and received via the wired communication line. Therefore, there is an advantage that the communication line does not interfere with the screw tightening work and the workability is improved. However, since electric tools generate electromagnetic noise due to the rotation of the motor, wireless communication during motor operation reduces the reliability of communication due to the effects of noise, and transmission and reception of work information and management information can be performed accurately. There was no possibility.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power tool with improved reliability of wireless communication with a management device and a management system thereof.

  In order to achieve the above object, the invention of claim 1 is used in a management system including one or more power tools and a management device that manages the work status of the power tools. A motor control unit that controls the rotation of the motor, a wireless communication unit that wirelessly communicates work information related to the work content between the management device, and an operation state of the work information by the wireless communication unit when the motor is not operating and the motor is not operating. And a communication control unit for starting wireless communication.

  In the invention of claim 2, the communication control unit causes the wireless communication unit to transmit a motor non-operation signal to the management device when the motor is not operating, and after securing a line with the management device, the wireless communication unit transmits work information. Wireless communication is started.

  According to a third aspect of the present invention, the communication control unit includes a storage unit that accumulates work information to be transmitted. When the work information accumulated in the storage unit reaches a predetermined amount of information, the communication control unit A motor non-operation signal is transmitted.

  According to a fourth aspect of the present invention, there is provided a detecting means for detecting whether or not the electric power tool main body is held by the tool holder for holding the electric power tool main body when not in use, and the communication control unit includes the electric power tool main body held by the tool holder. When the detection means detects this, a motor non-operation signal is transmitted from the wireless communication unit when the motor is not in operation.

  The invention of claim 5 includes a communication start button for starting wireless communication of an information signal, and the communication control unit receives a motor non-operation signal from the wireless communication unit when the motor is inactive when the communication start button is operated. Is transmitted.

  The invention according to claim 6 includes a timer unit that outputs a first activation signal when a predetermined time comes, and the communication control unit wirelessly receives a first activation signal from the timer unit when the motor is not operating. A motor non-operation signal is transmitted from the communication unit.

  The invention of claim 7 includes a timer unit that outputs a second activation signal when an elapsed time from the previous communication reaches a predetermined time, and the communication control unit receives the second activation signal from the timer unit. Then, a motor non-operation signal is transmitted from the wireless communication unit when the motor is not operating.

  According to the eighth aspect of the present invention, when the motor control unit starts the motor while the wireless communication unit performs wireless communication, the communication control unit temporarily stops the wireless communication by the wireless communication unit, and again after the motor is stopped. Wireless communication is started.

  The invention according to claim 9 is characterized in that when the communication control unit starts wireless communication by the wireless communication unit, the motor control unit does not start the motor until the wireless communication ends.

  A tenth aspect of the present invention is a power tool management system according to any one of the first to ninth aspects, and a wireless communication unit that receives work information transmitted from the power tool by a radio signal. And a management device that manages the work status of the power tool based on the received work information.

  According to the first aspect of the present invention, since the communication control unit starts wireless communication of work information by the wireless communication unit when the motor is not operating, electromagnetic noise generated by the motor adversely affects wireless communication of the work information. There is no effect, and the reliability of the wireless communication between the electric power tool and the management device can be improved.

  According to the invention of claim 2, when the communication control unit causes the wireless communication unit to transmit a motor non-operation signal to the management device, a line is secured with the management device, and thereafter, wireless communication by the wireless communication unit is performed. Since it is started, wireless communication between the power tool and the management device can be performed in a time that is not affected by electromagnetic noise generated by the motor, and the reliability of wireless communication can be improved. There is.

  According to the invention of claim 3, when the work information accumulated in the storage unit reaches a predetermined amount of information, wireless communication of the work information is started when the motor is not operating, so that larger data is transmitted collectively. Thus, there is an effect that the frequency of radio communication can be reduced and the use efficiency of radio waves can be increased.

  According to the invention of claim 4, when a series of work is finished and the power tool main body is held by the tool holder, wireless communication of work information is started when the motor is not operating, so larger data is transmitted collectively. Thus, there is an effect that the frequency of radio communication can be reduced and the use efficiency of radio waves can be increased.

  According to the invention of claim 5, when the communication start button is operated, wireless communication of work information is started when the motor is not operating. Therefore, by transmitting a larger amount of data collectively, the number of wireless communication can be reduced. There is an effect that the use efficiency of radio waves can be increased by reducing the frequency.

  According to the invention of claim 6, since the wireless communication of the work information is started when the motor is not operating when the predetermined time comes, the larger number of data is transmitted collectively to reduce the number of wireless communication and There is an effect that the use efficiency of the can be increased.

  According to the invention of claim 7, since the wireless communication of the work information is started when the motor is not operating after a predetermined time has elapsed since the previous communication, the number of times of wireless communication can be increased by transmitting larger data collectively. There is an effect that the use efficiency of radio waves can be increased.

  According to the invention of claim 8, when the motor is started during the wireless communication, the wireless communication is temporarily stopped, and the wireless communication is started again after the motor is stopped, so that it is not affected by the electromagnetic noise generated by the motor. By performing wireless communication in time, there is an effect that the reliability of wireless communication can be improved.

  According to the ninth aspect of the present invention, since the motor control unit prevents the motor from starting while the communication control unit performs wireless communication, the wireless communication is performed at a time not affected by the electromagnetic noise generated by the motor. As a result, the reliability of wireless communication can be improved.

  According to the invention of claim 10, there is an effect that it is possible to realize a power tool management system that improves the reliability of wireless communication of work information performed between the power tool and the management device.

  Below, one Embodiment of the management system of the electric tool which concerns on this invention is described based on FIGS.

  FIG. 2 is a schematic configuration diagram of the management system. This management system includes, for example, one or more power tools 1a, 1b, 1c,... 2 and.

  Since the electric tools 1a, 1b, 1c,... Have the same configuration, the electric tool 1a will be described as an example with reference to FIG. The electric power tool 1a has a hollow round cylindrical shape whose axial direction is the direction intersecting the axial direction of the grip portion 11 at one axial end of the hollow round cylindrical grip portion 11 formed to have a size that can be gripped by hand. A main body 12 is provided, and the grip portion 11 and the main body 12 are substantially T-shaped in a side view. A housing 10 (power tool main body) is formed by the main body 12, the grip portion 11, and the battery storage portion 13 provided at the other end of the grip portion 11 opposite to the main body 12.

  A chuck 15 to which a tool (bit) 14 such as a driver bit or a socket is detachably attached is provided on one end side in the axial direction protruding from the grip portion 11 of the main body 12. The chuck 15 is driven to rotate about the axial direction of the main body 12 with a motor 16 provided at the rear of the main body 12 as a drive source. The rotational driving force of the motor 16 is a drive transmission unit 17 built in the main body 12. It is transmitted to the chuck 15 via.

  The drive transmission unit 17 includes a reduction gear 17a having one end side (rear end side) connected to the motor 16, and an impact generating unit 17b connected to the other end side (front end side) of the reduction gear 17a. The rotational driving force of the motor 16 is decelerated and transmitted to the chuck 15 as an anvil via the hammer generating part 17b and the hammer generating part 17b. When a load exceeding a predetermined load is applied to the chuck 15, the hammer generating part 17b A striking motion is performed, and a shocking rotational driving force is transmitted to the chuck 15 by this striking motion.

  In addition, a trigger 18 that rotates the motor 16 by a pulling operation is provided on the front surface, which is the surface on the chuck 15 side of the upper end portion of the grip portion 11, so as to be movable in the front-rear direction. A trigger switch (not shown) that adjusts the rotation speed of the motor 16 in a stepless manner according to the amount of pull-in 18 is provided. Further, a forward / reverse changeover switch 19 for switching the rotation direction of the motor 16 to the normal rotation or reverse rotation direction is disposed slightly above the trigger 18. A circuit board 20 on which an internal circuit described later is formed is accommodated inside the grip portion 11. The electric tools 1a, 1b, 1c,... Are located on the front side of the main body 12 in the holding hole 3a of the tool holder 3 installed at the work place when the work is interrupted or finished when a series of work is finished. The tool holder 3 is held by inserting the portion.

  FIG. 2A is a schematic block diagram of an internal circuit of the electric tool 1a. The motor drive unit 32 excites the motor 16, the trigger switch 18a that gives a speed command corresponding to the pull-in amount of the trigger 18, and the trigger. A motor control unit 31a for controlling the output of the motor drive unit 32 based on input signals from the switch 18a and the forward / reverse switching switch 19; The power tool 1a includes a wireless communication unit 33 that performs wireless communication with the management device 2 via the antenna 33a, an identification number assigned to each of the power tools 1a, a tightening torque, the number of screws, work, and the like. The tool holder 3 includes a storage unit 34 that stores work information related to the work content of the screw tightening work such as time and battery remaining, and a push button switch that is pressed by the tool holder 3 when held in the tool holder 3, for example. Controls the communication of the detection switch 35 (detection means) that detects whether or not the main body 12 is held in the communication start button 36 that gives a communication start signal according to the operation, the timer unit 37, and the wireless communication unit 33. And a communication control unit 31b. Here, the motor control unit 31 a and the communication control unit 31 b are constituted by, for example, a microcomputer (hereinafter referred to as a microcomputer) 31. In addition, the operating power of the internal circuit of the electric power tool 1a is supplied from a battery pack (not shown) in the battery storage unit 13.

  On the other hand, as shown in FIG. 2 (b), the management device 2 performs wireless communication with the power tools 1a, 1b, 1c... Via the antenna 21a, and communication between the wireless communication unit 21 and the wireless communication unit 21. , And a control unit 22 that manages the work status of each electric tool 1a... And a storage unit 23 that stores work information from each electric tool 1a, 1b, 1c received by the wireless communication unit 21. Yes.

  The management system of the present embodiment has the above-described configuration, and each power tool 1a... Has work information (for example, tightening torque, screw tightening) related to the work content by the microcomputer 31 each time the screw tightening work is performed. The number, working time, remaining battery power, etc.) are stored in the storage unit 34. And the work information memorize | stored in the memory | storage part 34 from each electric tool 1a ... is transmitted to the management apparatus 2 by radio | wireless communication. The work information transmitted from each electric tool 1a... Includes the identification number assigned to each electric tool 1a... Based on which power tool 1a... Is determined, the received work information is stored in the storage unit 23 for each individual power tool 1a. The work status of each electric tool 1a... Can be managed based on the work information stored in 23.

  Here, in each electric tool 1a ..., the motor control unit 31a uses the motor drive unit 32 to control the operation / non-operation of the motor 16, and outputs a motor operation signal to the communication control unit 31b during the operation of the motor 16. To do. The communication control unit 31b monitors the operation state of the motor 16 based on the motor operation signal from the motor control unit 31a. During the operation of the motor 16, the wireless communication by the wireless communication unit 33 is stopped and the motor 16 is turned off. During operation, wireless communication of work information by the wireless communication unit 33 is started. FIG. 4A is a flowchart showing the start operation of wireless communication. In a state where the motor 16 is stopped (step S1), the communication control unit 31b sends a motor non-operation signal and its own identification number from the wireless communication unit 33. (Step S2), and the management device 2 that has received this motor non-operation signal secures a wireless communication line with the transmission-source power tool 1a based on the received identification number (Step S2). S3) The communication control unit 31b starts wireless communication of work information, and transmits the work information stored in the storage unit 34 from the wireless communication unit 33 (step S4).

  As described above, in the present embodiment, the communication control unit 31b determines the operation or non-operation of the motor 16 based on the motor operation signal input from the motor control unit 31a, and the wireless communication unit 33 when the motor 16 is not operating. Since the wireless communication of the work information is started using, wireless communication between each power tool 1a... And the management device 2 can be performed in a time not affected by the electromagnetic noise generated by the motor 16. And the reliability of wireless communication can be improved.

  In the present embodiment, the communication control unit 31b starts wireless communication when the motor 16 is not operating. However, the communication control unit 31b performs wireless communication based on the amount of work information stored in the storage unit 34. It is also possible to determine the start of. That is, as shown in the flowchart of FIG. 5, in the communication control unit 31b, the data amount of the work information accumulated in the storage unit 34 is set to a predetermined threshold value while the motor 16 is stopped (step S1). The wireless communication is not performed (step S6). If the data amount is less than the threshold value, the wireless communication is not performed (step S6). On the other hand, if the data amount has reached the threshold value in step S5, the communication control unit 31b transmits a motor non-operation signal and its own identification number from the wireless communication unit 33 (step S2). When the management device 2 that has received a radio communication line with the transmission source power tool 1a based on the received identification number (step S3), the communication control unit 31b starts wireless communication of work information. The work information stored in the storage unit 34 is transmitted from the wireless communication unit 33 (step S4).

  In this way, in the communication control unit 31b, when the data amount of the work information accumulated in the storage unit 33 reaches a predetermined threshold value, wireless communication of the work information is started when the motor 16 is not operating. By transmitting larger data collectively, the number of radio communications can be reduced and the use efficiency of radio waves can be increased. The communication control unit 31b starts wireless communication of work information when the data amount of the work information reaches a predetermined threshold. For example, when the work information reaches a predetermined number of screw tightening, wireless communication is performed. The wireless communication may be started when the amount of data or the amount of work content such as the number of screws tightened reaches a predetermined amount of information.

  Furthermore, in this embodiment, when the detection switch 35 detects that the housing 10 of the electric tool 1a... Is held by the tool holder 3 and outputs a detection signal, the communication control unit 31b is based on the detection signal of the detection switch 35. Then, the start of wireless communication may be determined. That is, as shown in the flowchart of FIG. 6, in the communication control unit 31 b, the electric tool 1 a... (Step S7), and if not inserted into the tool holder 3, wireless communication is not performed (step S6). On the other hand, as a result of the determination in step S7, if the tool is held by the tool holder 3, the communication control unit 31b transmits a motor non-operation signal and its own identification number from the wireless communication unit 33 (step S2). When the management device 2 that has received the operation signal secures a wireless communication line with the transmission-source power tool 1a based on the received identification number (step S3), the communication control unit 31b performs wireless communication of work information. The work information stored in the storage unit 34 is transmitted from the wireless communication unit 33 (step S4).

  As described above, when the communication control unit 31b interrupts or ends a series of operations and the main body 12 of the electric power tool 1a is held by the tool holder 3, wireless communication of work information is started when the motor 16 is not operating. Therefore, by transmitting a larger amount of data collectively, it is possible to reduce the number of times of wireless communication and increase the use efficiency of radio waves.

  Furthermore, in this embodiment, when the operator operates the communication start button 36, the communication control unit 31b may determine the start of wireless communication based on the communication start signal input from the communication start button 36. . That is, as shown in the flowchart of FIG. 7, the communication control unit 31b determines whether or not the communication start button 36 is pressed while the motor 16 is stopped (step S1) (step S8). If the communication start button 36 is not pressed, wireless communication is not performed (step S6). On the other hand, if the communication start button 36 is pressed as a result of the determination in step S8, the communication control unit 31b transmits a motor non-operation signal and its own identification number from the wireless communication unit 33 (step S2). When the management device 2 that has received the non-operation signal secures a wireless communication line with the power tool 1a as the transmission source based on the received identification number (step S3), the communication control unit 31b performs wireless communication of work information. The work information stored in the storage unit 34 is transmitted from the wireless communication unit 33 (step S4).

  In this way, in the communication control unit 31b, when the operator operates the communication start button 36, wireless communication of work information is started when the motor 16 is not in operation. By reducing the number of times of wireless communication, the use efficiency of radio waves can be increased.

  In the present embodiment, when a predetermined time set in advance (for example, 8:00 before the start of work, 12:00 of the break time, 20:00 after the end of work, or a predetermined time every hour) is reached, the timer unit 37 The first activation signal may be output to the communication control unit 31b, and the communication control unit 31b may determine the start of wireless communication based on the first activation signal input from the timer unit 37. That is, as shown in the flowchart of FIG. 8, in the communication control unit 31b, whether or not the first start signal is input from the timer unit 37 while the motor 16 is stopped (step S1), that is, a predetermined time. (Step S9), and wireless communication is not performed when the predetermined time is not reached (step S6). On the other hand, if it is determined at step S9 that the predetermined time has been reached, the communication control unit 31b transmits a motor non-operation signal and its own identification number from the wireless communication unit 33 (step S2). When the management device 2 that has received a radio communication line with the transmission source power tool 1a based on the received identification number (step S3), the communication control unit 31b starts wireless communication of work information. The work information stored in the storage unit 34 is transmitted from the wireless communication unit 33 (step S4).

  In this way, the communication control unit 31b starts wireless communication of work information when the motor 16 is not operating when a preset predetermined time arrives. By reducing the number of communications, the use efficiency of radio waves can be increased.

  Furthermore, in this embodiment, when the elapsed time from the previous communication reaches a predetermined time, the timer unit 37 causes the communication control unit 31b to output the second activation signal, and the communication control unit 31b The start of wireless communication may be determined based on the second activation signal input from 37. That is, as shown in the flowchart of FIG. 9, the communication control unit 31b determines whether the second start signal is input from the timer unit 37 while the motor 16 is stopped (step S1). It is determined whether or not a predetermined time has elapsed since the time of communication (step S10). If the predetermined time has not elapsed since the previous communication, wireless communication is not performed (step S6). On the other hand, as a result of the determination in step S10, if a predetermined time has elapsed since the previous communication, the communication control unit 31b transmits a motor non-operation signal and its own identification number from the wireless communication unit 33 (step S2). When the management device 2 that has received the motor non-operation signal secures a wireless communication line with the transmission-source power tool 1a based on the received identification number (step S3), the communication control unit 31b Wireless communication is started, and work information stored in the storage unit 34 is transmitted from the wireless communication unit 33 (step S4).

  In this way, in the communication control unit 31b, when a predetermined time has elapsed since the previous communication, the wireless communication of the work information is started when the motor 16 is not operating. By reducing the number of times of wireless communication, the use efficiency of radio waves can be increased.

  By the way, in this embodiment, when work information is transmitted from the power tools 1a to the management device 2, information such as a set value of a tightening torque is transmitted from the management device 2 side to the transmission source power tools 1a. You may make it do. In this case, as shown in the flowchart of FIG. 4B, the communication control unit 31b sends a motor non-operation signal and its own identification number from the wireless communication unit 33 while the motor 16 is stopped (step S1). The management device 2 that has transmitted the motor non-operation signal is determined based on the received identification number, determines the transmission source power tool 1a, and transmits transmission data to be transmitted to the transmission source power tool 1a. When the creation of work information to be transmitted with the transmission-source power tool 1a is completed (step S3 ′), the communication control unit 31b and the management device 2 are prepared. Wireless communication is started (step S4), and wireless signals are transmitted and received between the power tool 1a ... and the management device 2 without being affected by noise generated by the motor 16. It can be.

  Further, as described above, in the management system of the present embodiment, the communication control unit 31b starts wireless communication with the management device 2 when the motor is not operating, but the wireless communication unit 33 performs wireless communication. When the motor control unit 31a starts the motor 16 using the motor drive unit 32 while performing the communication, the communication control unit 31b temporarily stops the wireless communication by the wireless communication unit 33, and after the motor 16 is stopped, the wireless communication is performed again. It is preferable to start communication. FIG. 10A is a flowchart showing the operation in this case. When the motor control unit 31a starts the motor 16 in step S11, the communication control unit 31b is based on the motor operation signal input from the motor control unit 31a. Then, the start of the motor 16 is detected, and it is determined whether communication is in progress (step S12). Here, if the communication is not being performed, the operation is continued as it is (step S16), and if the communication is being performed, the communication control unit 31b temporarily stops the wireless communication by the wireless communication unit 33 (step S13), and then the motor in step S14. When 16 is stopped, wireless communication by the wireless communication unit 33 is started again (step S15). As described above, in the communication control unit 31b, when the motor 16 is started during wireless communication, the wireless communication by the wireless communication unit 33 is temporarily stopped, and after the motor 16 is stopped, the wireless communication is started again. By performing wireless communication at a time that is not affected by the generated electromagnetic noise, the reliability of wireless communication can be improved.

  In the management system of the present embodiment, the communication control unit 31b starts wireless communication with the management device 2 when the motor is not operating, but the motor control unit 31a is connected to the communication control unit 31b. It is also preferable to determine whether or not communication is being performed based on the input signal and prevent the motor control unit 31a from starting the motor 16 from the start of wireless communication to the end of wireless communication. FIG. 10B is a flowchart showing the operation in this case. When a trigger input (motor start command) is input from the trigger switch 18a to the motor control unit 31a (step S17), the motor control unit 31a performs communication control. It is determined whether or not the unit 31b has started wireless communication, that is, whether or not wireless communication is being performed (step S18). If the communication is not being performed, the motor 16 is started using the motor drive unit 32. On the other hand, if the result of determination in step S18 is that wireless communication is in progress, the motor control unit 31a does not operate the motor 16, and after the wireless communication by the wireless communication unit 33 is completed in step S19, the motor drive unit 32 is used. The motor 16 is started (step S20). As described above, in the motor control unit 31a, the motor 16 is not started while the wireless communication unit 33 performs wireless communication, and the motor 16 is started after the wireless communication is completed. The wireless communication reliability can be improved by performing the wireless communication at a time not affected by the above.

  In the present embodiment, the power tool provided with the housing 10 having the grip portion 11 and the main body 12 that are substantially T-shaped in side view has been described as an example. However, the main body 12 and the grip portion 11 are arranged in a straight line. Needless to say, a power tool having a substantially I-shaped housing in side view may be used. In this embodiment, the impact driver is described as an example of the electric power tool. However, an oil pulse impact driver or a driver having no impact function may be used.

The management system of the electric tool of this embodiment is shown, (a) is a schematic block diagram of an electric tool, (b) is a schematic block diagram of a management apparatus. It is a schematic block diagram of a management system same as the above. It is explanatory drawing which showed typically the electric tool which comprises the same as the above. (A) (b) is a flowchart explaining the communication start operation | movement same as the above. It is a flowchart explaining operation | movement same as the above. It is a flowchart explaining operation | movement same as the above. It is a flowchart explaining operation | movement same as the above. It is a flowchart explaining operation | movement same as the above. It is a flowchart explaining operation | movement same as the above. (A) (b) is a flowchart explaining the operation | movement same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Electric tool 2 Management apparatus 16 Motor 31a Motor control part 31b Communication control part 32 Motor drive part 33 Wireless communication part 33a Antenna

Claims (10)

  Used in a management system including one or a plurality of power tools and a management device that manages the work status of the power tools, between a motor that rotates the tool, a motor control unit that controls the rotation of the motor, and the management device A wireless communication unit that wirelessly communicates work information related to work content, and a communication control unit that monitors the operating state of the motor and starts wireless communication of work information by the wireless communication unit when the motor is not operating A power tool.   The communication control unit transmits a motor non-operation signal from the wireless communication unit to the management device when the motor is not operating, and after securing a line with the management device that has received the motor non-operation signal, the wireless communication unit transmits work information. 2. The electric tool according to claim 1, wherein wireless communication is started.   A storage unit for storing work information to be transmitted is provided, and the communication control unit causes the wireless communication unit to transmit a motor non-operation signal when the motor does not operate when the work information stored in the storage unit reaches a predetermined amount of information. The power tool according to claim 2, wherein:   The tool holder for holding the power tool body when not in use has a detecting means for detecting whether or not the power tool body is held, and the communication control unit detects that the power tool body is held by the tool holder. Then, the motor non-operation signal is transmitted from the wireless communication unit when the motor is not in operation.   A communication start button for starting wireless communication of an information signal is provided, and when the communication start button is operated, the communication control unit causes the wireless communication unit to transmit a motor non-operation signal when the motor is not operating. The electric tool according to claim 2.   A timer unit that outputs a first start signal when a predetermined time comes is provided, and the communication control unit receives a motor non-operation signal from the wireless communication unit when the motor is not operating when the first start signal is input from the timer unit. The power tool according to claim 2, wherein the power tool is transmitted.   A timer unit that outputs a second activation signal when the elapsed time from the previous communication reaches a predetermined time is provided, and the communication control unit is inoperative when the second activation signal is input from the timer unit. 3. The electric tool according to claim 2, wherein a motor non-operation signal is transmitted from the wireless communication unit at times.   If the motor control unit starts the motor while the wireless communication unit is performing wireless communication, the communication control unit temporarily stops the wireless communication by the wireless communication unit, and starts the wireless communication again after the motor is stopped. The power tool according to any one of claims 1 to 7, characterized in that:   8. The motor control unit according to claim 1, wherein when the communication control unit starts wireless communication by the wireless communication unit, the motor control unit does not start the motor until the wireless communication is ended. Electric tool.   A power communication device according to any one of claims 1 to 9, and a wireless communication unit that receives work information transmitted from the power tool by a wireless signal, wherein the work status of the power tool is determined based on the received work information. A power tool management system comprising a management device for management.

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