JP2014018868A - Electric tool management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator to set a setting parameter most suitable for various work of an electric tool, from the outside of the electric tool, to improve work efficiency drastically.SOLUTION: The electric tool management system includes: an electric tool 1; a control circuit for controlling the electric tool with a predetermined setting parameter; and a portable device 59 separated from the electric tool 1, for changing a setting value of the setting parameter from the outside. When the setting value of the setting parameter of the electric tool 1 is changed from the portable device 59, the electric tool 1 and the portable device 59 communicate with each other by radio, and while operation of the electric tool 1 is stopped, the setting value of the setting parameter can be changed, and while the electric tool 1 is in operation, the setting value of the setting parameter cannot be changed.

Description

  The present invention relates to control of a power tool, and more particularly to a power tool management system capable of changing setting parameters.

  2. Description of the Related Art Conventionally, there is known an electric tool that operates a tip tool connected to a motor by driving the motor (for example, see Patent Document 1 below).

JP 2010-99823 A

  There are various types of tip tools that can be attached to electric tools, and there are also various types of tool applications. Therefore, the required motor control varies depending on the type of the tip tool and the type of work. As a system for controlling the motor, there is a system in which a trigger switch is provided in the electric tool and the motor rotation speed is controlled by operating the trigger switch. For example, an example will be given for a case where a screw tightening operation is performed using a screwdriver as a tip tool. At the start of screw tightening work, the operator usually operates the trigger switch by a minute amount while pressing the screw against the mating member, and rotates the motor by a minute amount to position the screw tip at the target position. I do. Further, when the screw diameter is small or the screw length is short, the necessary torque is small and the working time is short, so that it is desirable that the motor rotation speed be easily adjusted in a low region. Therefore, it is desirable that the adjustment in the region where the number of rotations operable by the operation of the trigger switch (hereinafter referred to as trigger operation) is also low is easy. On the other hand, when the screw diameter is large or the screw length is long, the necessary torque is large and the working time is long. Therefore, it is desirable that the motor rotation speed be easily adjusted in a high region. . Therefore, it is desirable that the adjustment in the region where the number of rotations operable by the trigger operation is high is easy. The set value of the motor rotation speed with respect to the trigger switch operation amount is usually one relational expression. For this reason, there is only one trigger operation specification despite the different trigger operation specifications required for the type of screw, and work efficiency deteriorates if the trigger operation specifications are not appropriate.

  In addition, an example will be given of a case where bolting is performed using a wrench as a tip tool. In the case of the bolt tightening work, since the positioning work is not necessary, the motor rotation speed may be maximized immediately after the trigger operation is started, and adjustment of the motor rotation speed with respect to the trigger operation is not required. Therefore, the required characteristics are different from the specifications of the trigger operation at the time of screw tightening. In addition, there is an electric tool that is provided with a push button or the like on the electric tool so that the set rotational speed during operation can be switched. During the bolting operation, it is necessary to operate the tool at a predetermined rotation speed and keep the tightening torque at a constant value. The number of rotations at that time depends on the specifications of the bolt, and the set value must be changed as appropriate.

  The present invention has been made in view of such a situation, and its purpose is to enable the operator to set optimum setting parameters for various operations of the electric tool from the outside of the electric tool so as to greatly improve work efficiency. It is to provide a power tool management system capable of performing the above.

One embodiment of the present invention is a power tool management system. The power tool management system includes a power tool, a control circuit in the power tool that controls the power tool with a predetermined setting parameter, and the power tool that changes a setting value of the setting parameter from the outside of the power tool. Has a separate mobile device,
When changing the setting value of the setting parameter from the portable device to the electric tool, the electric tool and the portable device communicate wirelessly, and the setting of the setting parameter is performed when the operation of the electric tool is stopped. The value can be changed, and the setting value of the setting parameter cannot be changed when the power tool is in operation.

  In the above aspect, a switch is provided in the power tool, and the state of the power tool is switched between a changeable state and a non-changeable state of the setting parameter by operating the switch, and the state of the power tool is changeable. The setting parameter can be changed when the power tool is in a state, and the setting parameter cannot be changed when the power tool is in the unchangeable state.

  In the aspect, the power tool is provided with a notification unit, and when the communication is correctly performed between the power tool and the portable device and the setting parameter is correctly changed, the notification unit notifies the power tool. There should be. Moreover, the notification means may be a light that illuminates the tip of the power tool.

  The said aspect WHEREIN: The communication part of the said electric tool for performing the communication by the radio | wireless is only possible to receive, It is good that the communication part of the said portable device can only transmit.

  In the above aspect, the power tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit. The rotation speed of the motor is adjusted according to the magnitude of the operation amount, the operation amount of the trigger operation unit and the rotation speed of the motor are defined by a predetermined relational expression, and the relational expression is the setting parameter, The relational expression may be changed by changing the setting parameter.

  In the above aspect, the electric tool has a housing, a motor mounted in the housing, and a maximum rotational speed that is an upper limit of a rotational speed that can be operated by the motor, and the motor is operated at the maximum rotational speed. The control circuit is controlled so that the maximum rotation speed is the setting parameter, and the maximum rotation speed may be changed by changing the setting parameter. Further, it is preferable that a changeover switch for setting the maximum rotation number is provided, and the maximum rotation number can be switched to a plurality of different values by operating the changeover switch.

  In the above aspect, the electric tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit. When the operation time after the trigger operation is performed and the motor is started reaches the automatic stop time, the motor is operated even in the state where the trigger operation is performed. It is preferable that the control circuit is controlled to stop, the automatic stop time is the setting parameter, and the automatic stop time is changed by changing the setting parameter. It is preferable that a changeover switch for setting the automatic stop time is provided, and the automatic stop time can be switched to a plurality of different values by operating the changeover switch.

  In the above aspect, the power tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit, and the motor is operated. The motor is controlled by the control circuit with the target current value, the target current value is the setting parameter, and the target current value is changed by changing the setting parameter. There should be. It is preferable that a changeover switch for setting the target current value is provided, and the target current value can be switched to a plurality of different values by operating the changeover switch.

  In the above aspect, the power tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit, and the motor is operated. The motor is controlled by the control circuit at the automatic stop angle, the automatic stop angle is the setting parameter, and the automatic stop angle is changed by changing the setting parameter. There should be. It is preferable that a switch for setting the automatic stop angle is provided, and the automatic stop angle can be switched to a plurality of different values by operating the switch.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, since the setting parameter can be changed from the outside by wireless communication using a portable device separate from the electric tool, it is possible to select the optimum setting parameter for the work, and a great improvement in work efficiency is expected. it can. In addition, the power tool does not need to be larger than when all the switches for switching to the desired setting parameters are provided on the power tool side.

It is an electric tool management system concerning an embodiment of the invention, and is an explanatory view showing an internal configuration of electric tool 1 as a side section. The top view of the portable apparatus 59 which concerns on embodiment of this invention. The block diagram which shows the structure of the drive control system of the motor 3 in embodiment. The table which shows the set value of automatic stop time in an embodiment. The table | surface which shows the setting value of the maximum rotation speed in embodiment. The top view which shows the structure of the operation part 53 in embodiment. The graph of the fastening torque with respect to the fastening time and motor rotation speed at the time of bolt fastening operation | work in embodiment. The graph of the specification of the screw with respect to the fastening time and the optimal rotation speed of a motor at the time of the screw fastening operation | work in embodiment. The graph which showed the relationship of the PWM duty ratio corresponding to the detection signal of trigger operation amount (stroke) in embodiment. The flowchart of the motor control in embodiment. The table | surface which shows the setting value of an automatic stop angle in embodiment. The flowchart of another motor control in embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 shows the overall configuration of a power tool management system according to an embodiment of the present invention, which is a power tool that operates by driving various tip tools with a built-in motor, and a separate accessory device. Consists of mobile devices. In FIG. 1, the internal configuration of the electric power tool 1 is shown as a side sectional view. The electric tool 1 is, for example, an impact driver that operates by connecting an AC cord to an AC power source such as a commercial power source. The mechanical configuration for rotationally driving the tip tool in the impact driver may be known, but an example will be described below.

  The electric power tool 1 uses an AC power source such as a commercial power source as a power source, drives the rotary impact mechanism 21 using the motor 3 mounted on the housing 2 as a drive source, and applies a rotational force and an impact force to the anvil 30 that is an output shaft. The rotary impact force is intermittently transmitted to a tip tool (not shown) such as a driver bit held in the mounting hole 30a covered with the sleeve 31 to perform operations such as screw tightening and bolt tightening.

  The motor 3 of a brushless system (for example, 4 poles 6 coils, 2 poles 3 coils, etc.) is accommodated in the cylindrical trunk | drum 2a of the housing 2 which comprises a substantially T shape in side view. The rotation shaft 3e of the motor 3 is rotatably held by a bearing 19a (bearing member) provided in the vicinity of the center portion of the body 2a of the housing 2 and a rear end side bearing 19b (bearing member). A rotor 3a having a rotor magnet 3d is integrated with the rotary shaft 3e. A stator core 3b around which a stator coil 3c is wound is fixed via an insulator 15 inside the body portion 2a. In front of the motor 3, a rotor fan 13 that is coaxially mounted with the rotary shaft 3 e and rotates in synchronization with the motor 3 is provided. An inverter circuit board 4 for driving the motor 3 is disposed behind the motor 3. The air flow generated by the rotor fan 13 is sent from the air intake hole 17 formed on the rear side of the body portion 2a of the housing 2 and the air intake port (not shown) formed in the housing portion around the inverter circuit board 4 to the body. Is taken into the portion 2a and flows mainly between the rotor 3a and the stator core 3b, and is further sucked from the rear of the rotor fan 13 and flows in the radial direction of the rotor fan 13. The housing around the rotor fan 13 The air is discharged out of the housing 2 through an air discharge port (not shown) formed in the portion.

  The inverter circuit board 4 is an annular multilayer board having substantially the same diameter as the outer shape of the motor 3, and on the inverter circuit board 4, a plurality of switching elements 5 such as FETs (Field Effect Transistors), positions of Hall ICs, etc. A detection element and other electronic elements are mounted. A plastic spacer 35 is provided between the rotor 3a and the bearing 19b. The shape of the spacer 35 is substantially cylindrical, and is arranged in order to keep the distance between the bearing 19b and the rotor 3a constant.

  A trigger switch 6 having a trigger 6 a is disposed at an upper portion in a handle portion 2 b that integrally extends at a substantially right angle from the body portion 2 a of the housing 2, and a switch substrate 7 is provided below the trigger switch 6. A control circuit board 8 having a function of controlling the speed of the motor 3 by the pulling operation of the trigger 6 a is accommodated in the lower part in the handle portion 2 b. The control circuit board 8 is electrically connected to the AC power source and the trigger switch 6. Connected. The trigger switch 6 is connected to the inverter circuit board 4 via the signal line 11, and the control circuit board 8 is connected to the inverter circuit board 4 via the signal line 12.

  The rotary striking mechanism 21 includes a planetary gear reduction mechanism 22, a spindle 27, and a hammer 24, and a rear end is held by a bearing 20 and a front end is held by a metal bearing 29. When the trigger 6a is pulled and the motor 3 is started, the motor 3 starts to rotate in the direction set by the forward / reverse switching lever 10, and the rotational force is decelerated by the planetary gear reduction mechanism 22 and transmitted to the spindle 27. The spindle 27 is rotated at a predetermined speed. Here, the spindle 27 and the hammer 24 are connected by a cam mechanism, and this cam mechanism is formed on the V-shaped spindle cam groove 25 formed on the outer peripheral surface of the spindle 27 and the inner peripheral surface of the hammer 24. A hammer cam groove 28 and a ball 26 engaged with the cam grooves 25 and 28 are formed.

  The hammer 24 is always urged forward by the spring 23, and when stationary, the hammer 26 is in a position spaced from the end face of the anvil 30 by engagement between the ball 26 and the cam grooves 25 and 28. And the convex part which is not shown in figure is formed symmetrically at two places on the rotation plane where the hammer 24 and the anvil 30 face each other.

  When the spindle 27 is driven to rotate, the rotation is transmitted to the hammer 24 via the cam mechanism, and the convex portion of the hammer 24 engages with the convex portion of the anvil 30 before the hammer 24 rotates halfway. When relative rotation occurs between the spindle 27 and the hammer 24 due to the reaction force at that time, the hammer 24 compresses the spring 23 along the spindle cam groove 25 of the cam mechanism and moves toward the motor 3 side. And start retreating.

  When the protrusion of the hammer 24 moves over the protrusion of the anvil 30 due to the backward movement of the hammer 24 and the engagement between the two is released, the hammer 24 is accumulated in the spring 23 in addition to the rotational force of the spindle 27. While being accelerated rapidly in the rotational direction and forward by the action of the elastic energy and the cam mechanism, the spring 23 is moved forward by the urging force of the spring 23, and the convex portion is reengaged with the convex portion of the anvil 30 to rotate integrally. start. At this time, since a strong rotational impact force is applied to the anvil 30, the rotational impact force is transmitted to the screw via a tip tool (not shown) attached to the mounting hole 30a of the anvil 30. Thereafter, the same operation is repeated, and the rotational impact force is intermittently and repeatedly transmitted from the tip tool to the screw. For example, the screw is screwed into a material to be tightened such as wood. The light 51 illuminates the tip side of the tip tool and the material to be tightened.

  A communication unit 58 is provided in the housing 2. The communication unit 58 performs wireless communication with an external portable device 59 and can change the setting parameters of the power tool 1 from the outside. Wireless communication between the communication unit 58 and the portable device 59 is performed by, for example, an infrared communication method. The communication unit 58 is equipped with only a wireless communication receiving circuit and can receive only, and the portable device 59 is equipped with only a wireless communication transmitting circuit and can only transmit. A normal communication circuit is equipped with a transmission / reception circuit capable of transmission and reception, but the circuit volume is increased as compared with a reception circuit only for reception. Since the electric tool 1 is held in the hand, downsizing is desired. By using only the receiving circuit for the communication circuit of the communication unit 58, the circuit volume can be reduced, and the electric tool can be reduced in size. Can do. Further, when the communication from the portable device 59 to the communication unit 58 is correctly performed, the light 51 is blinked to notify the operator that the communication is correctly performed. The external portable device 59 may be a mobile phone, a portable personal computer, or the like.

  FIG. 2 is a plan view of the external portable device 59. The portable device 59 has a display unit 591 such as a liquid crystal screen for displaying the current set value and operation buttons 592 (four in the illustrated example) as changeover switches for changing the set value. The display unit 591 displays the current set value. For example, the set value of the maximum rotation speed, which will be described later, the current set value of the automatic stop time, and the like are displayed. The current set value displayed on the display unit 591 can be changed by operating the operation button 592. Further, the infrared transmission unit 593 is provided in the portable device 59 so as to face the communication unit 58 of the electric tool, thereby transmitting infrared rays from the infrared transmission unit 593 and performing wireless communication with the communication unit 58 of the electric tool.

  FIG. 3 is a block diagram showing a configuration of a drive control system of the motor 3 in the electric tool 1 shown in FIG. In the present embodiment, a supply voltage from an AC power supply 39 such as a commercial power supply is converted into, for example, a full-wave rectified wave by a rectifier circuit 40 and supplied to an inverter circuit 47 as a motor drive circuit without a smoothing capacitor. The motor 3 is, for example, a three-phase brushless motor. The motor 3 is a so-called inner rotor type, and includes a rotor 3 a, a stator, and three position detection elements 42. The rotor 3a includes a rotor magnet 3d including a plurality of sets (two sets in the present embodiment) of N poles and S poles. The stator includes a stator coil 3c and a stator core 3b composed of three-phase stator windings U, V, and W that are star-connected. The three position detecting elements 42 are arranged at predetermined intervals in the circumferential direction, for example, at an angle of 60 °, in order to detect the rotational position of the rotor 3a. Based on the rotational position detection signals from these position detection elements 42, the energization direction and time to the stator windings U, V, W are controlled, and the motor 3 rotates. The position detection element 42 is provided on the inverter circuit board 4 at a position facing the rotor 3a. The signal output from the position detection element 42 is applied to the rotor position detection circuit 43.

  The electronic elements mounted on the inverter circuit board 4 include six switching elements Q1 to Q6 such as FETs connected in a three-phase bridge format. The control circuit mounted on the control circuit board 8 includes at least a calculation unit 41 and a control signal output circuit 46. The gates of the six switching elements Q1 to Q6 that are bridge-connected in the inverter circuit 47 are connected to the control signal output circuit 46, and the drains or the sources of the six switching elements Q1 to Q6 are star-connected. Connected to the stator windings U, V, W. As a result, the six switching elements Q1 to Q6 perform the switching operation by the switching element drive signals (H1 to H6) input from the control signal output circuit 46, and the voltage (full-wave rectified wave) applied to the inverter circuit 47. ) As three-phase (U-phase, V-phase and W-phase) voltages Vu, Vv and Vw, and power is supplied to the stator windings U, V and W.

  Of the switching element driving signals (three-phase signals) for driving the gates of the switching elements, the switching element driving signals for driving the gates of the low-side switching elements Q4, Q5, Q6 are pulse width modulation signals (PWM signals) H4, H5, H6. The calculation unit 41 adjusts the power supply amount to the motor 3 by changing the pulse width (duty ratio) of the PWM signal based on the detection signal of the trigger operation amount (stroke) of the trigger switch 6. It is possible to control the start / stop and rotation speed. The relationship between the PWM duty ratios corresponding to the trigger operation amount (stroke) detection signal is a one-to-one relationship, and is represented by one relational expression.

  Here, the PWM signal may be supplied to any one of the high side switching elements Q1 to Q3 or the low side switching elements Q4 to Q6 of the inverter circuit 47, and the switching elements Q1 to Q3 or the switching elements Q4 to Q6 are switched at high speed. As a result, the power supplied to each stator winding U, V, W can be controlled. In this embodiment, since the PWM signal is supplied to the low-side switching elements Q4 to Q6, the power supplied to the stator windings U, V, and W is adjusted by controlling the pulse width of the PWM signal. Thus, the rotational speed of the motor 3 can be controlled.

  The electric tool 1 is provided with a forward / reverse switching lever 10 for switching the rotational direction of the motor 3, and the rotational direction setting circuit 50 switches the rotational direction of the motor each time a change in the forward / reverse switching lever 10 is detected. The control signal is transmitted to the calculation unit 41. The calculation unit 41 is, for example, a microcomputer, not shown, but a central processing unit (CPU) for outputting a drive signal based on the processing program and data, a ROM for storing the processing program and control data, It includes a RAM for temporarily storing data, a timer, and the like.

  The control signal output circuit 46 generates a drive signal for alternately switching predetermined switching elements Q1 to Q6 based on the output signals of the rotation direction setting circuit 50 and the rotor position detection circuit 43 according to the control of the calculation unit 41. To do. As a result, the predetermined windings of the stator windings U, V, and W are alternately energized to rotate the rotor in the set rotation direction. In this case, the drive signal applied to the low-side switching elements Q4 to Q6 is output as a PWM modulation signal based on the output control signal of the applied voltage setting circuit 49. The current value supplied to the motor 3 (the current value flowing through the resistor Rs) is measured by the current detection circuit 48, and the value is fed back to the calculation unit 41 to be adjusted to the set drive power. The The PWM signal may be applied to the high side switching elements Q1 to Q3.

  The three position detecting elements 42 are arranged at predetermined angles in the circumferential direction in order to detect the rotational position of the rotor 3a. Therefore, the signal change of the position detecting elements changes in the time interval depending on the motor rotational speed. The rotation speed detection circuit 411 inside the calculation unit 41 detects the motor rotation speed by detecting the time interval of the signal change. Similarly, the rotation angle detection circuit 412 detects the rotation angle of the motor 3 based on the signal change of the position detection element 42.

  The operation time detection circuit 413 measures the energization time to the motor 3 using a timer inside the calculation unit 41. When the trigger switch 6 is operated, the start of the motor 3 is started, and simultaneously with the start of the start of the motor, the operation time detection circuit 413 starts measuring the operation time. When the operation time measured by the operation time detection circuit 413 reaches the automatic stop time, the calculation unit 41 stops the motor 3 even if the trigger switch 6 is operated. The automatic stop time setting circuit 414 sets an automatic stop time based on an input signal from the operation unit 53 (described later in FIG. 6). The automatic stop time has a plurality of different values, and the automatic stop time is switched every time an input signal is input from the operation unit 53.

  FIG. 4 shows a set value of the automatic stop time in the present embodiment. 4A or 4B is selected, any one of the setting modes A to D can be selected by operating the operation unit 53 to set the automatic stop time. However, the operation unit 53 on the power tool side cannot switch between FIGS. 4A and 4B (the switching between FIGS. 4A and 4B is performed by the portable device 59 as will be described later).

  The maximum rotation number setting circuit 415 sets the maximum rotation number of the motor 3 based on the input signal from the operation unit 53. The maximum rotation speed has a plurality of different values, and the maximum rotation speed is switched every time an input signal is input from the operation unit 53.

  FIG. 5 shows the set value of the maximum rotation speed in the present embodiment. The maximum number of rotations is a set value of the upper limit of the number of rotations that can be rotated by the motor 3, and the calculation unit 41 controls the motor rotation number by changing the PWM duty ratio so as to be equal to or less than the set maximum rotation number. In a state in which any one of the setting parameters shown in FIGS. 5A and 5B is selected, any of the setting modes A to D can be selected by operating the operation unit 53 to set the maximum rotation speed. However, the operation unit 53 on the electric power tool side cannot switch between FIGS. 5A and 5B (switching between FIGS. 5A and 5B is performed by the portable device 59 as will be described later).

  The communication circuit 416 receives the infrared transmission signal transmitted from the portable device 59 and reflects the value of the setting parameter in the setting value of the maximum rotation speed and the setting value of the automatic stop time. Although FIG. 4A shows an example of the set value of the automatic stop time, it can be changed to the set value shown in FIG. 4B, for example, by changing the setting parameter by communication (from FIG. 4B). Changes to (A) are also possible). Similarly, FIG. 5A shows an example of the setting value of the maximum rotational speed, but it can be changed to, for example, the setting value shown in FIG. 5B by changing the setting parameter by communication (FIG. 5B ) To (A) is also possible). The changed setting parameters are stored in the storage circuit inside the calculation unit 41. Even when the power to the calculation unit is turned off, the setting parameters do not disappear. After the power is turned on again, the setting parameters are stored. It is possible to operate with the set parameters.

  The operation unit 53 illustrated in FIG. 6 includes, for example, a maximum rotation number display unit 54, an automatic stop time display unit 55, a maximum rotation number setting button 56 and an automatic stop time setting button 57 as a changeover switch. When the operation of the rotation speed setting button 56 is detected, the calculation unit 41 switches the setting value of the maximum rotation speed, and a numerical value corresponding to the maximum rotation speed is displayed on the maximum rotation speed display section 54. When the operation of the automatic stop time setting button 57 is detected, the calculation unit 41 switches the set value of the automatic stop time, and a numerical value corresponding to the automatic stop time is displayed on the automatic stop time display unit 55. Normally, when the set value is switched, the maximum rotation speed setting button 56 and the automatic stop time setting button 57 are operated independently. Therefore, when the set value is switched, the maximum rotation speed setting button 56 and the automatic rotation time setting button 57 are automatically operated. The stop time setting buttons 57 are not operated at the same time. Accordingly, when the maximum rotation speed setting button 56 and the automatic stop time setting button 57 are operated simultaneously, the mode shifts to a setting parameter switchable mode by infrared communication with the portable device 59. For example, when the setting parameter is switched from the portable device 59 by mistake, the setting parameter is not switched unless the mode is shifted to the setting parameter switchable mode. Accordingly, it is possible to prevent the setting parameter from being switched unintentionally by the operator. The operation unit 53 may have a function of setting and displaying a motor target current value and an automatic stop angle as setting parameters. For example, it is possible to adopt a configuration having a changeover switch such as a push button for setting a target current value and an automatic stop angle.

  FIG. 7 shows a graph of the relationship between the tightening time and the tightening torque with respect to the motor rotation speed during the bolt tightening operation. The desired tightening torque differs depending on the work, and in order to perform the bolt tightening operation with the desired tightening torque, it is necessary to keep the tightening time and the motor rotation speed constant for each bolt. In the present embodiment, the values of the automatic stop time and the maximum number of rotations can be switched to constant values corresponding to the work, so that it is always possible to work with a constant and accurate tightening torque.

  FIG. 8 is a graph showing the relationship between the tightening time and the screw specifications with respect to the optimum rotational speed of the motor during the screw tightening operation. The smaller the screw (wooden screw or other tapered shape) diameter and the shorter the overall length, the smaller the optimum rotational speed and the shorter the tightening time. The larger the screw diameter and the longer the overall length, the larger the optimum rotational speed and the tightening time. become longer. If the number of rotations at the time of tightening is significantly greater than the optimum number of rotations, it will lead to damage to the mating member due to breakage of the screw head or excessive tightening, so it is necessary to control the motor at the optimum number of rotations when tightening the screws. In addition, the shorter the overall length of the screw, the shorter the tightening time for the operation. Therefore, it is necessary to control the motor from operation to stop as soon as possible, and it is difficult to cope with trigger operation. In the present embodiment, the values of the automatic stop time and the maximum number of rotations can be switched to constant values corresponding to the size of the screw, so that stable screw tightening work can always be performed.

  FIG. 9 shows the relationship of the PWM duty ratio corresponding to the trigger operation amount (stroke) detection signal. As the relationship, the relational expressions (A), (B), and (C) are shown. The relational expression (A) is a relational expression when the change of the PWM duty ratio is simply proportional to the trigger operation amount. The relational expression (B) is a relational expression in which the PWM duty is low from the start of the trigger operation to just before reaching the full stroke, and after that, the PWM duty rapidly reaches 100% of the maximum value. At the start of the screw tightening operation, the operator usually operates the trigger switch by a minute amount while pressing the screw against the mating member, and rotates the motor by a minute amount to position the screw tip to the target position. Do. Further, when the screw diameter is small or the screw length is short, the necessary torque is small and the working time is short, so that it is desirable that the motor rotation speed be easily adjusted in a low region. Therefore, it is desirable that the adjustment in the region where the number of rotations operable by the trigger operation is also low is easy, and the case of the relational expression (B) is suitable in that case. The relational expression (C) is a relational expression in which the PWM duty increases immediately after the trigger operation is started, and after that, the PWM duty gradually reaches 100% of the maximum value. During screw tightening, if the screw diameter is large or the screw length is long, the required torque is large and the work time is long, so the motor rotation speed can be easily adjusted in a high region. desired. In addition, when bolting is performed using a wrench for the tip tool, positioning work is not required, so the motor rotation speed may be maximized immediately after the trigger operation starts, and the motor rotation speed can be adjusted in response to the trigger operation. Is also not required. Therefore, when performing screw tightening work and bolt tightening work when the screw diameter is large, the relational expression (C) is suitable. Although the relationship of the PWM duty ratio corresponding to the detection signal of the trigger operation amount (stroke) required according to the work application is different, the relational expressions (A), (B), (C ), And a relational expression suitable for each work can be selected.

  The control method of the present embodiment performed by the calculation unit 41 will be described using the flowchart of FIG. First, the calculation unit 41 acquires from the applied voltage setting circuit 49 whether the operation of the trigger switch 6 is on (S1). If the operation of the trigger switch 6 is on (S1: YES), the calculation unit 41 starts the operation of the motor 3 (S2). Simultaneously with the start of operation of the motor 3, the operation time detection circuit 413 starts measuring the operation time (S3). Next, the calculation unit 41 obtains from the applied voltage setting circuit 49 whether the operation of the trigger switch 6 is on (S5). If the operation of the trigger switch 6 is off (S5: NO), the calculation unit 41 The operation of the motor 3 is stopped (S4), and the process returns to S1 again. On the other hand, when the operation of the trigger switch 6 is ON in S5 (S5: YES), the calculation unit 41 detects the rotation speed of the motor 3 by the rotation speed detection circuit 411 (S6), and the maximum motor speed is set. Motor control is performed while adjusting the PWM duty ratio so that the motor is operated at the rotational speed (S7), the value of the operating time measured by the operating time detection circuit 413 is confirmed (S8), and the measured operating time is It is confirmed whether or not the automatic stop time has been reached (S9). If the measured operation time has not reached the automatic stop time (S9: NO), the process returns to S5 and the operation of the motor 3 is continued. On the other hand, when it is determined that the operation time measured in S9 has reached the automatic stop time (S9: YES), the calculation unit 41 stops the operation of the motor 3 (S10), and the operation of the trigger switch 6 is continued. Is determined (S11). When the operation of the trigger switch 6 is continued (S11: YES), the motor 3 is kept stopped. When the operation of the trigger switch 6 is released (S11: NO), the process returns to S1.

  When the operation of the trigger switch 6 is OFF in the determination of S1 (S1: NO), it is determined whether or not the automatic stop time setting button 57 of the operation unit 53 is operated (S12), and the automatic stop time setting button 57 is operated. If there is (S12: YES), the set value of the automatic stop time is switched (S13). Next, it is determined whether or not the maximum rotational speed setting button 56 of the operation unit 53 is operated (S14). If the maximum rotational speed setting button 56 is operated (S14: YES), the setting value of the maximum rotational speed is set. Switching is performed (S15). The set value can be switched only when the operation of the trigger switch 6 is off and the motor 3 is stopped. In the determination of S16, it is determined whether or not it is a communicable mode in which the setting parameter of the power tool 1 can be changed. When it is a communicable mode in which the setting parameter can be changed (specifically, when the communicable mode is started in S51) (S16: YES), infrared communication is performed from the portable device 59 to perform communication. When the infrared ray is received by the unit 58 (S17: YES), the parameters of the automatic stop time and the maximum rotation speed are changed based on the value of the received communication signal (S18), and the communicable mode is ended (S19). On the other hand, when the mode is not the communication enable mode (S16: NO), it is determined whether the operation of the automatic stop time setting button 57 and the maximum rotation speed setting button 56 are pressed at the same time (S20). If so (S20: YES), the communication mode is entered (S21).

  In the flowchart of FIG. 10, the control method in the case where the setting value of the operation time and the maximum rotation number can be switched has been described. However, separately from this control method, the setting value of the rotation angle and the maximum rotation number can be switched. The control method will be described. When the trigger switch 6 is operated, the activation of the motor 3 is started, but the rotation angle detection circuit 412 starts detecting the rotation angle simultaneously with the start of the activation of the motor 3. When the rotation angle (cumulative rotation angle) measured by the rotation angle detection circuit 412 reaches the automatic stop angle, the calculation unit 41 stops the motor 3 even if the trigger switch 6 is operated. That is, the operation time of S3, S8, and S9 in FIG.

  The automatic stop angle has a plurality of different set values, and FIG. 11 shows the set values of the automatic stop angle in the present embodiment. 11A or 11B is selected, any one of the setting modes A to D can be selected by operating the operation unit 53 to set the automatic stop angle. However, the operation unit 53 on the power tool side cannot switch between FIGS. 11A and 11B, but by performing infrared communication from the portable device 59, for example, FIG. ) To the set value shown in (B) (change from FIG. 11 (B) to (A) is also possible).

  In the flowchart of FIG. 10, the control method in the case where the setting value of the operation time and the maximum number of revolutions can be switched has been described. However, separately from this control method, the setting value of the operation time and the target current value of the motor can be switched. The control method in this case will be described with reference to the flowchart of FIG. In this case, the operation unit 53 has a target current value setting button as a changeover switch. In the case of FIG. 12, S31 to S35 are the same as S1 to S5 of FIG. 10, and when the operation of the trigger switch 6 is ON in S35 (S35: YES), the calculation unit 41 is controlled by the current detection circuit 48. The current value of the motor 3 is detected (S36), the motor is controlled while adjusting the PWM duty ratio so that the motor is operated at the set target current value (S37), and measured by the operation time detection circuit 413. The value of the running time is confirmed (S38). Steps S39 to S43 are the same as steps S9 to S13 of FIG. 10. Next, it is determined whether or not the target current value setting button of the operation unit 53 is operated (S44), and the target current value setting button is operated. In this case (S44: YES), the set value of the target current value is switched (S45). The set value can be switched only when the operation of the trigger switch 6 is off and the motor 3 is stopped. S46 to S51 are the same as S16 to S21 in FIG.

  According to the present embodiment, the following effects can be achieved.

(1) A control circuit on the control circuit board 8 that controls the electric tool 1 with predetermined setting parameters (a circuit configuration including the calculation unit 41 and the control signal output circuit 46), and electric motor that changes the setting values of the setting parameters from the outside. A portable device 59 separate from the tool 1 is provided, and when the setting value of the setting parameter is changed from the portable device 59 to the electric tool 1, the electric tool 1 and the portable device 59 communicate wirelessly to set the setting parameter. The configuration can change the value. As a result, the operator can set the optimum setting parameter for the work from the outside, and the setting parameter suitable for each work can be set, so that the work efficiency can be greatly improved.

(2) The power tool 1 can change the setting value of the setting parameter when the operation of the power tool 1 is stopped, and cannot change the setting value of the setting parameter when the operation of the power tool 1 is operating. is there. Thereby, it becomes possible to prevent danger when the set parameter is changed during the operation of the electric power tool 1 and the operation of the electric power tool 1 during the operation is unintentionally changed.

(3) An operation unit 53 having switches (setting buttons 56 and 57) operated by an operator is provided in the electric power tool 1, and the state of the electric power tool 1 can be changed by a switch operation. When the power tool 1 is switched and is in a changeable state (in this example, when the setting buttons 56 and 57 are pressed at the same time), the setting parameter can be changed by the external device 59. When the state is an unchangeable state, the setting parameter cannot be changed by the external device 59. Thereby, it is possible to prevent the setting parameters from being changed against the operator's intention.

(4) When the power tool 1 is provided with a notification means (light 51 for illuminating the tip of the power tool 1), communication is correctly performed between the power tool 1 and the portable device 59, and the setting parameter is correctly changed. Since the notification means notifies the worker, it is possible to reliably notify the worker that the setting parameter has been set correctly. By combining the light 51 as the notification means, it is not necessary to newly provide another notification means, and the configuration can be simplified.

(5) The communication unit 58 of the electric power tool 1 can only receive, and the communication unit of the portable device 59 can only transmit, so that only the circuit of the receiving unit is mounted on the electric power tool 1. The circuit does not increase in size, and as a result, the electric tool 1 does not increase in size. Moreover, the structure of the electric tool 1 side communication part 58 and the portable apparatus 59 is simplified.

(6) A housing 2, a motor 3 mounted in the housing 2, and a trigger switch 6 as a trigger operation unit. The motor 3 is controlled in response to an operation of a trigger 6 a included in the trigger switch 6, and is triggered In the electric power tool 1 in which the rotation amount of the motor 3 is adjusted according to the magnitude of the operation amount 6a, and the operation amount of the trigger 6a and the rotation number of the motor 3 are defined by a predetermined relational expression, the relational expression is Since the setting parameter can be changed by the portable device 59, the setting value can be changed according to various work applications to improve work efficiency.

(7) Set the maximum number of revolutions in the electric power tool 1 that has the maximum number of revolutions that is the upper limit of the number of revolutions that can be operated by the motor 3 and is controlled by the control circuit so that the operation of the motor 3 is below the maximum number of revolutions. Since the parameter can be changed by the portable device 59, the setting value can be changed according to various work applications to improve the work efficiency.

(8) Since the electric tool 1 is provided with the operation unit 53 having the maximum rotation number setting button 56 as a changeover switch for setting the maximum rotation number, the maximum rotation number is set by operating the maximum rotation number setting button 56. Since it is possible to switch to a plurality of different values and the set value of the maximum number of revolutions of the motor 3 can be changed, the set value can be changed according to various work applications, and work efficiency can be improved. .

(9) It has an automatic stop time for controlling the operation time of the motor 3, and when the operation time after the trigger 6a is operated and the motor 3 is started reaches the automatic stop time, the trigger operation is performed. In the power tool 1 that is controlled by the control circuit so as to stop the operation of the motor 3 even in the state of being, the automatic stop time can be changed as a setting parameter by the portable device 59, so that the set value according to various work applications Can be changed to improve the work efficiency.

(10) Since the electric tool 1 is provided with the operation unit 53 having the automatic stop time setting button 57 as a changeover switch for setting the automatic stop time, the automatic stop time is set by operating the automatic stop time setting button 57. Since it is possible to switch to a plurality of different values and the set value of the automatic stop time can be changed, it is possible to improve the work efficiency by changing the set value according to various work applications.

(11) In the case of the electric power tool 1 that has a target current value during operation of the motor 3 and the motor 3 is controlled by the control circuit with the target current value, the target current value can be changed by the portable device 59 as a setting parameter. Therefore, it is possible to improve the work efficiency by changing the set value according to various work uses.

(12) When the power tool 1 is provided with the operation unit 53 having a target current value setting button as a changeover switch for setting the target current value, the target current value varies depending on the operation of the target current value setting button. Since the set value of the target current value during operation of the motor can be changed, it is possible to improve the work efficiency by changing the set value according to various work applications.

(13) In the case of the electric power tool 1 that has an automatic stop angle during operation of the motor 3 and the motor 3 is controlled by the control circuit at the automatic stop angle, the automatic stop angle can be changed by the portable device 59 as a setting parameter. Therefore, it is possible to improve the work efficiency by changing the set value according to various work uses.

(14) When the power tool 1 is provided with the operation unit 53 having an automatic stop angle setting button as a changeover switch for setting the automatic stop angle, the automatic stop angle varies depending on the operation of the automatic stop angle setting button. Since the setting value of the automatic stop angle during operation of the motor can be changed, the setting value can be changed according to various work applications to improve work efficiency.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the above embodiment, the communication between the communication unit 58 of the power tool 1 and the portable device 59 is exemplified by the infrared communication method, but a short-range wireless communication method using radio waves other than the infrared communication method is adopted. It is also possible to do.

  In addition to the light 51 that illuminates the tip of the power tool 1, a notification means for notifying the operator that communication between the power tool 1 and the portable device 59 is correctly performed and that the setting parameter has been correctly changed is provided. Also good.

DESCRIPTION OF SYMBOLS 1 Electric tool 2 Housing 2a Body part 2b Handle part 3 Motor 3a Rotor 3b Stator core 3c Stator coil 3d Rotor magnet 3e Rotating shaft 4 Inverter circuit board 5 Switching element 6 Trigger switch 6a Trigger 7 Switch board 8 Control circuit board 10 Forward / reverse switching lever 12 Signal line 13 Rotor fan 15 Insulator 17 Air intake holes 19a, 19b, 20 Bearing 21 Rotating impact mechanism 22 Planetary gear speed reduction mechanism 23 Spring 24 Hammer 25 Spindle cam groove 26 Ball 27 Spindle 28 Hammer cam groove 29 Metal bearing 30 Anvil 30a Mounting Hole 35 Spacer 39 AC power supply 40 Rectifier circuit 41 Operation unit 411 Rotation speed detection circuit 412 Rotation angle detection circuit 413 Operation time detection circuit 414 Automatic stop time setting circuit 415 Maximum rotation speed setting Circuit 43 Rotor position detection circuit 47 Inverter circuit 48 Current detection circuit 51 Light 52 Voltage detection circuit 53 Operation section 54 Maximum rotation speed display section 55 Automatic stop time display section 56 Maximum rotation speed setting button 57 Automatic stop time setting button 58 Communication section 59 Mobile devices

Claims (14)

An electric tool, a control circuit in the electric tool for controlling the electric tool with a predetermined setting parameter, and a portable device separate from the electric tool for changing the setting value of the setting parameter from the outside of the electric tool; Comprising
When changing the setting value of the setting parameter from the portable device to the electric tool, the electric tool and the portable device communicate wirelessly, and the setting of the setting parameter is performed when the operation of the electric tool is stopped. A power tool management system characterized in that a value can be changed and the setting value of the setting parameter cannot be changed when the operation of the power tool is in operation.   A switch is provided in the electric tool, and the state of the electric tool is switched between a changeable state and a non-changeable state by the operation of the switch, and the state of the electric tool is in the changeable state. The power tool management system according to claim 1, wherein the setting parameter can be changed, and the setting parameter cannot be changed when the power tool is in the unchangeable state.   The notification means is provided in the electric tool, and the communication means notifies when the communication is correctly performed between the electric tool and the portable device, and the setting parameter is correctly changed. The power tool management system according to 1 or 2.   The power tool management system according to claim 3, wherein the notification unit is a light that illuminates a tip of the power tool.   The communication unit of the power tool for performing the wireless communication can only receive, and the communication unit of the portable device can only transmit. The power tool management system according to item.   The power tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit, and a large operation amount of the trigger operation unit. Accordingly, the rotational speed of the motor is adjusted, the operation amount of the trigger operation unit and the rotational speed of the motor are defined by a predetermined relational expression, which is the setting parameter, and the change of the setting parameter The electric power tool management system according to any one of claims 1 to 5, wherein the relational expression is changed by the above.   The electric tool has a housing, a motor mounted in the housing, and a maximum rotation speed that is an upper limit of a rotation speed operable by the motor, and the operation of the motor is less than the maximum rotation speed. The control circuit according to claim 1, wherein the maximum rotation speed is controlled by the control circuit, and the maximum rotation speed is changed by changing the setting parameter. Electric tool management system.   The power tool management system according to claim 7, further comprising a changeover switch for setting the maximum rotation speed, wherein the maximum rotation speed can be switched to a plurality of different values by operating the changeover switch.   The electric tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit, and controls an operation time of the motor. When the operation time after the trigger operation is performed and the motor operation is started reaches the automatic stop time, the motor operation is stopped even when the trigger operation is performed. 9. The electric motor according to claim 1, wherein the electric stop time is controlled by a control circuit, and the automatic stop time is the setting parameter, and the automatic stop time is changed by changing the setting parameter. Tool management system.   The power tool management system according to claim 9, further comprising a changeover switch for setting the automatic stop time, wherein the automatic stop time can be switched to a plurality of different values by operating the changeover switch.   The electric tool has a housing, a motor mounted in the housing, and a trigger operation unit, controls the motor in response to an operation of the trigger operation unit, and a target current value during operation of the motor The motor is controlled by the control circuit with the target current value, the target current value is the setting parameter, and the target current value is changed by changing the setting parameter. Item 11. The power tool management system according to any one of Items 1 to 10.   The power tool management system according to claim 11, further comprising a changeover switch for setting the target current value, wherein the target current value can be switched to a plurality of different values by operating the changeover switch.   The power tool includes a housing, a motor mounted in the housing, and a trigger operation unit, and controls the motor in response to an operation of the trigger operation unit, and an automatic stop angle during operation of the motor. The motor is controlled by the control circuit at the automatic stop angle, the automatic stop angle is the setting parameter, and the automatic stop angle is changed by changing the setting parameter. Item 13. The power tool management system according to any one of Items 1 to 12.   14. The power tool management system according to claim 13, further comprising a changeover switch for setting the automatic stop angle, wherein the automatic stop angle can be switched to a plurality of different values by operating the changeover switch.