JP2012240165A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool capable of operating on the basis of only a control mode that a user requires.SOLUTION: A ROM of an arithmetic part 78 is stored with 20 control modes (control programs) for controlling a motor 3. Four control modes among the 20 control modes stored in the ROM are stored as four drive modes in an EEPROM 80. Specifically, the 20 control modes stored in the ROM are given numbers, and four numbers corresponding to the four control modes are stored as drive modes in the EEPROM 80. The power tool is driven on the basis of one drive mode selected by a changeover switch among the four drive modes.

Description

  The present invention relates to an electric tool, and more particularly to an electronic pulse driver that outputs a rotational driving force.

  In a conventional electric power tool, a structure in which an anvil is struck by a hammer that is rotated by the rotational force of a motor is known (for example, see Patent Document 1). The electric tool includes a pulse mode and an impact mode as a plurality of control modes.

JP 2011-31313 A

  However, when a large number of control modes can be operated in the conventional power tool, even if a dial is provided for switching the control mode, it takes time to perform an operation to match a desired control mode. Furthermore, a user who mainly performs screw tightening and a user who mainly performs bolt tightening have different control modes to be used, and even if a large number of control modes are provided, a control mode unnecessary for the user should be installed. It becomes.

  Then, an object of this invention is to provide the electric tool which can operate | move based only on the control mode which a user requires.

  In order to achieve the above object, according to the present invention, a motor, a tip tool driving unit driven by the motor, a first storage means for storing a plurality of control modes for controlling the motor, Provided is an electric tool comprising second storage means for storing a part of control modes of the plurality of control modes as a plurality of drive modes, and a control unit for controlling the motor based on the plurality of drive modes. Yes.

  According to such a configuration, the electric tool can be operated based only on the control mode selected by the user, and the electric tool that meets the user's request can be provided.

  The second storage means further includes an external device connection unit connectable to an external device, and the second storage means transmits the partial control mode transmitted from the external device connected to the external device connection unit to the plurality of control modes. It is preferable to store the driving mode.

  According to such a configuration, a plurality of drive modes can be set by the external device via the external device connection unit.

  ADVANTAGE OF THE INVENTION According to this invention, the electric tool which can operate | move based only on the control mode which a user requires can be provided.

1 is a schematic perspective view of an electronic pulse driver according to an embodiment of the present invention. Sectional drawing of the electronic pulse driver which concerns on embodiment of this invention. The control block diagram of the electronic pulse driver which concerns on embodiment of this invention. The figure which shows the state which connected the main body and PC in the electronic pulse driver which concerns on embodiment of this invention. The flowchart of the process which changes the drive mode of the electronic pulse driver which concerns on embodiment of this invention. The figure which shows the GUI screen for changing the drive mode of the electronic pulse driver which concerns on embodiment of this invention.

  Hereinafter, the structure of the electronic pulse driver 1 which is an example of the electric tool which concerns on the 1st Embodiment of this invention is demonstrated based on FIGS. 1-3.

  As shown in FIG. 1, the electronic pulse driver 1 includes a main body 1 </ b> A and a battery 24. The main body 1A is mainly composed of a housing 2, a motor 3, a hammer part 4, an anvil part 5, an inverter circuit 6, a control part 7, and a rotational position detecting element (Hall element) 8 (FIG. 3). ing. The housing 2 is made of resin and forms an outer shell of the electronic pulse driver 1, and is mainly composed of a substantially cylindrical body portion 21 and a handle portion 22 extending from the body portion 21.

  In the body portion 21, the motor 3 is arranged so that the longitudinal direction thereof coincides with the axial direction of the motor 3, and the hammer portion 4 and the anvil portion 5 are arranged side by side toward one end side in the axial direction of the motor 3. Has been. In the following description, the anvil portion 5 side is defined as the front side, the motor 3 side is defined as the rear side, and a direction parallel to the axial direction of the motor 3 is defined as the front-rear direction. Further, the body part 21 side is defined as the upper side, the handle part 22 side is defined as the lower side, and the direction in which the handle part 22 extends from the body part 21 is defined as the vertical direction. Further, a direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction.

  A metal hammer case 23 in which the hammer part 4 and the anvil part 5 are incorporated is arranged at a front side position in the body part 21. The hammer case 23 has a substantially funnel shape in which the diameter gradually decreases toward the front, an opening 23a is formed at the front end portion, and a metal 23A is provided on the inner wall that defines the opening 23a. .

  In addition, a plurality of intake ports 21 a and exhaust ports 21 b through which outside air is sucked and discharged into the body portion 21 by a fan 32 described later are formed in the body portion 21. The motor 3 is cooled by the outside air. A switch mechanism 6 is provided on the rear side of the motor 3.

  The handle portion 22 extends downward from a substantially central position in the front-rear direction of the body portion 21 and is configured integrally with the body portion 21. A battery 24 that supplies power to the motor 3 and the like is detachably attached to the lower end of the handle portion 22. A trigger 25 is provided above the handle portion 22 and at the front side position. In addition, a change-over switch (toggle switch) (not shown) that switches four drive modes to be described later is disposed on the right side surface of the lower portion of the handle portion 22. Further, in the vicinity of the changeover switch, a display unit (not shown) for displaying which mode is selected from four drive modes described later is arranged.

  As shown in FIG. 2, the motor 3 is a brushless motor mainly composed of a rotor 3A having an output shaft portion 31 and a stator 3B arranged to face the rotor 3A. It arrange | positions in the trunk | drum 21 so that it may correspond with the front-back direction. The output shaft portion 31 protrudes forward and backward of the rotor 3A, and is rotatably supported on the body portion 21 by a bearing at the protruding portion. A fan 32 that rotates coaxially and integrally with the output shaft portion 31 is provided at a location protruding to the front side of the output shaft portion 31. Further, a pinion gear 31A is connected to the output shaft portion 31 at the foremost end position of the location. It is provided so as to rotate coaxially.

  The hammer part 4 is mainly composed of a gear mechanism 41 and a hammer 42, and is built in the front side of the motor 3 in the hammer case 23. The gear mechanism 41 includes two planetary gear mechanisms 41B and 41C that share one outer gear 41A. The outer gear 41 </ b> A is built in the hammer case 23 and is fixed to the body portion 21. One planetary gear mechanism 41B is disposed in the outer gear 41A so as to mesh with the outer gear 41A, and uses the pinion gear 31A as a sun gear. The other planetary gear mechanism 41C is arranged in the outer gear 41A and in front of one planetary gear mechanism 41B so as to mesh with the outer gear 41A, and the output shaft of the one planetary gear mechanism 41B is used as a sun gear. Yes.

  The hammer 42 is defined on the front surface of the planet carrier of the planetary gear mechanism 41C, protrudes toward the front side, and is disposed at a position shifted from the rotation center of the planet carrier of the planetary gear mechanism 41C. And a first engagement protrusion 42A and a second engagement protrusion (not shown) located at the counter electrode across the rotation center of the planet carrier of the planetary gear mechanism 41C.

  The anvil portion 5 is disposed in front of the hammer portion 4 and mainly includes a tip tool mounting portion 51 and an anvil 52. The tip tool mounting portion 51 is formed in a cylindrical shape and is rotatably supported in the opening 23a of the hammer case 23 via a metal 23A. A drill 51a into which a bit (not shown) is inserted is drilled in the front tool mounting portion 51 in the front-rear direction, and a chuck 51A for holding a bit (not shown) is provided at the front end portion.

  The anvil 52 is configured to be integrated with the tip tool mounting portion 51 in the hammer case 23 at the rear of the tip tool mounting portion 51, and disposed opposite to the rotation center of the tip tool mounting portion 51. It has the 1st to-be-engaged protrusion 52A and the 2nd to-be-engaged protrusion 52B which protruded toward. When the hammer 42 rotates, the first engagement protrusion 42A and the first engagement protrusion 52A collide with each other, and at the same time, the second engagement protrusion (not shown) and the second engagement protrusion 52B collide, The rotational force of the hammer 42 is transmitted to the anvil 52.

  As shown in FIG. 3, the inverter circuit 6 includes six switching elements Q1 to Q6 such as FETs connected in a three-phase bridge format.

  The control unit 7 is mounted on a substrate disposed near the battery 24 in the handle unit 22, and is connected to the battery 24 and has a trigger 25, an inverter circuit 6, a changeover switch (not shown), and a display (not shown). Connected to the department. As shown in FIG. 3, the control unit 7 includes a current detection circuit 71, a switch operation detection circuit 72, an applied voltage setting circuit 73, a rotation direction setting circuit 74, a rotor position detection circuit 75, and a rotation. An angle detection circuit 76, a temperature detection circuit 77, a calculation unit 78, a control signal output circuit 79, an EEPROM 80, and an external connection terminal 81 are provided. The external connection terminal 81 is a terminal for connecting the PC 82 (FIG. 4), which is an external device, to the main body 1 </ b> A, and is provided at a portion of the handle 22 that faces the battery 24.

  The rotational position detecting element 8 is provided at a position facing the permanent magnet 3C of the rotor 3A, and is arranged at predetermined intervals (for example, every angle of 60 °) in the circumferential direction of the rotor 3A.

  Next, the configuration of the drive control system of the motor 3 will be described with reference to FIG. In the present embodiment, the motor 3 is a three-phase brushless DC motor, the rotor 3A has permanent magnets including a plurality of sets (two sets in the present embodiment) N poles and S poles, and the stator 3B is Star-connected three-phase stator windings U, V, and W.

  The gates of the switching elements Q1 to Q6 of the inverter circuit 6 are connected to the control signal output circuit 79 of the control unit 7, and the drains or sources of the switching elements Q1 to Q6 are the stator windings U, V, Connected to W. The six switching elements Q <b> 1 to Q <b> 6 perform a switching operation according to the switching element drive signal input from the control signal output circuit 79, and the DC voltage of the battery 24 applied to the inverter circuit 66 is three-phase (U phase, V phase). And W phase) Electric power is supplied to the stator windings U, V, W as voltages Vu, Vv, Vw. Specifically, the stator windings U, V, and W that are energized by the output switching signals H1, H2, and H3 input from the control signal output circuit 79 to the positive power supply side switching elements Q1, Q2, and Q3, that is, the rotor The direction of rotation of 3A is controlled. Further, power is supplied to the stator windings U, V, and W by pulse width modulation signals (PWM signals) H4, H5, and H6 that are input from the control signal output circuit 79 to the negative power supply side switching elements Q4, Q5, and Q6. The amount, that is, the rotational speed of the rotor 3A is controlled.

  The current detection circuit 71 detects the current value supplied to the motor 3 and outputs it to the calculation unit 78. The switch operation detection circuit 72 detects the presence / absence of the operation of the trigger 25 and outputs it to the calculation unit 78. The applied voltage setting circuit 73 outputs a signal corresponding to the operation amount of the trigger 25 to the calculation unit 78.

  Further, the electronic pulse driver 1 is provided with a forward / reverse switching lever (not shown) for switching the rotation direction of the motor 3. When the rotation direction setting circuit 74 detects switching of the forward / reverse switching lever, the motor 3. A signal for switching the rotation direction is transmitted to the calculation unit 78.

  The rotor position detection circuit 75 detects the rotational position of the rotor 3 </ b> A based on the signal from the rotational position detection element 8 and outputs the detected rotational position to the calculation unit 78. The rotation speed detection circuit 76 detects the rotation speed of the rotor 3 </ b> A based on the signal from the rotation position detection element 8 and outputs the rotation speed to the calculation unit 78.

  The rotation angle detection circuit 76 is for detecting the angle of the rotor and using the detected value when performing control based on the rotation angle. Further, the temperature detection circuit 77 detects the temperature of the motor 3, and the calculation unit 78 is configured to stop the rotation of the motor 3 when the motor 3 reaches a predetermined temperature.

  Although not shown, the calculation unit 78 is 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, and temporary storage of data. RAM and a timer are provided. The calculation unit 78 outputs the output switching signals H1, H2, and H3 based on the signals from the rotation direction setting circuit 74 and the rotor position detection circuit 75, and the pulse width modulation signal (PWM signal) based on the signal from the applied voltage setting circuit 73. ) H4, H5, and H6 are generated and output to the control signal output circuit 79. The PWM signal may be output to the positive power supply side switching elements Q1 to Q3, and the output switching signal may be output to the negative power supply side switching elements Q4 to Q6.

  The ROM of the calculation unit 78 stores 20 control modes (control programs) for controlling the motor 3. Then, four control modes among the 20 control modes stored in the ROM are stored in the EEPROM 80 as four drive modes. Specifically, numbers are assigned to the 20 control modes stored in the ROM, and four numbers corresponding to the four control modes are stored in the EEPROM 80. Then, the drive mode selected from the four drive modes by the changeover switch is displayed on the display unit as the currently selected drive mode. Further, the CPU reads out a control mode corresponding to the selected drive mode from the ROM and controls the motor 3.

  Next, the 20 control modes stored in the ROM of the calculation unit 78 will be described. The electronic pulse driver 1 according to the present embodiment has a total of 20 control modes including a drill mode, clutch modes 1 to 10, torque control modes 1 to 5, and pulse modes 1 to 4.

  The drill mode is a mode in which the hammer 42 and the anvil 52 are integrally rotated, and is mainly used when wood screws are fastened. The current flowing through the motor 3 increases as the fastening proceeds.

  The clutch mode is a mode in which the driving of the motor 3 is stopped when the current flowing through the motor 3 increases to a target value (target torque) while the hammer 42 and the anvil 52 are integrally rotated. In addition, it is used when importance is attached to fastening with an accurate torque, such as fastening fasteners that appear on the exterior after fastening. In this embodiment, ten clutch modes are provided according to the tightening force (target torque value).

  In the torque control mode, when the current flowing in the motor 3 increases to a predetermined value (predetermined torque) while the hammer 42 and the anvil 52 are integrally rotated, the forward rotation and the reverse rotation of the motor 3 are alternately switched. This mode is used to stop the driving of the motor 3 after hitting a predetermined number of hits, and is used when fastening a fastener or the like with a higher torque than in the clutch mode. In the electronic pulse driver 1 in the present embodiment, five torque control modes are provided.

  In the pulse mode, when the current flowing in the motor 3 increases to a predetermined value (predetermined torque) while the hammer 42 and the anvil 52 are integrally rotated, the forward rotation and the reverse rotation of the motor 3 are alternately switched and hit. This mode is used to fasten a fastener, and is mainly used for fastening a long screw used in a place that does not appear in the appearance. Thereby, a strong fastening force can be supplied, and at the same time, a repulsive force from the workpiece can be reduced. And in the electronic pulse driver 1 in this Embodiment, four pulse modes are provided according to fastening force (value of predetermined torque).

  Next, a method in which the user selects four control modes from among the twenty control modes and stores them in the EEPROM 80 as the four drive modes will be described with reference to FIGS. First, as shown in FIG. 4, the battery 24 is removed from the electronic pulse driver 1, and the main body 1 </ b> A and the PC 82 are connected to each other by the USB cable 83. The USB cable 83 is connected to the external connection terminal 81 of the main body 1A, and electricity is supplied from the PC 82 to the main body 1A via the USB cable 83. The PC 82 includes a main body 82A including a CPU, a ROM, a RAM, and the like, and a display 82B, and application software for setting a drive mode is stored in advance in the ROM of the PC 82.

  After the main body 1A and the PC 82 are connected, the user activates the application software stored in the PC 82, so that a request for returning the main body data and setting values of the main body 1A is sent to the PC 82 as shown in FIG. The data is transmitted from the CPU to the main body 1A (S1). Here, the main body data indicates the model name of the electronic pulse driver 1 and is stored in the ROM of the arithmetic unit 78, and the set values indicate the four drive modes stored in the EEPROM 80.

  The CPU of the main body 1A always determines whether or not a reply request has been received after connection with the PC 82 (S2). Upon receiving a reply request from the PC 82 (S2: YES), the main body data and set values are stored in the PC 82. (S3). The main body 1A always determines whether or not a transmission request has been received until a reply request is received (S2: NO).

  After transmitting a reply request (S1), the PC 82 determines whether or not there is a reply of main body data and setting values from the main body 1A after a predetermined time has passed (S4), and if there is a reply (S4: YES) Then, a reply confirmation response is transmitted to the main body 1A (S5). The received main body data is stored in the RAM of the PC 82. If there is no reply (S4: NO), communication abnormality processing is performed (S6), and the process returns to S1. In the communication abnormality process (S6), for example, the number of occurrences of abnormality is counted. Then, when the number of occurrences of abnormality reaches a predetermined number, an error notification of communication abnormality is given to the user.

  Further, the main body 1A transmits the main body data and the set value (S3), and after a predetermined time elapses, it is determined whether or not a reply confirmation response is returned from the PC 82 (S7). If there is no reply (S7: NO), a communication abnormality process similar to S6 is performed (S8), and the process returns to S2. Along with the communication abnormality process (S8), the fact that the process is performed again from S1 is transmitted to the PC 82 again.

  Next, after sending the reply confirmation response (S5), the PC 82 displays the GUI screen 90 shown in FIG. 6 on the display 82B of the PC 82 when the communication abnormality is not sent from the main body 1A. (S9). The GUI screen 90 includes a model name display area 91, a control mode list display area 92, a transmission mode display area 93, a setting button 94, a transmission button 95, and a reset button 96.

  In the model name display area 91, the model name of the electronic pulse driver 1 is displayed based on the main body data. In the control mode list display area 92, a list of 20 control modes of the electronic pulse driver 1 is displayed based on the main body data. In the transmission mode display area 93, the current control mode (drive mode) of the electronic pulse driver 1 is displayed based on the received set value. By displaying the GUI screen 90, the control mode of the transmission mode display area 93 can be changed (S10).

  The user can erase the selected control mode by selecting one of the four control modes displayed in the transmission mode display area 93 and clicking the reset button 96. Further, when the user selects one control mode from the list of 20 control modes and clicks the setting button 94, the selected control mode can be displayed in the transmission mode display area 93. In the present embodiment, four control modes are set to be selectable. Then, after the user sequentially selects the four control modes, when the transmission button 95 is clicked, the four control modes are transmitted as set values (drive mode) from the PC 82 to the main body 1A. In the present embodiment, the numbers assigned to the four control modes are transmitted as set values to main body 1A.

  After making the control mode of the transmission mode display area 93 changeable, the PC 82 determines whether or not the four control modes (setting values) have been confirmed (S11). Specifically, it is determined whether or not the transmission button 95 is clicked. While the transmission button 95 is not clicked (S11: NO), the processes of S10 and S11 are repeated. Then, the PC 82 determines that the set value has been confirmed when the transmission button 95 is clicked (S11: YES), and transmits the set value to the main body 1A (S12). The transmitted set value is stored in association with the main body data stored in the RAM in the PC 82.

  After receiving the confirmation response (S7: YES), the main body 1A determines whether or not the set value has been received from the PC 82 (S13). When the set value is received from the PC 82 (S13: YES), the set value is written in the EEPROM 80 in place of the currently stored set value (S14).

  After transmitting the set value (S12), the PC 82 transmits a main body data / set value return request to the main body 1A again (S15). After writing the set value in the EEPROM 80 (S14), the main body 1A determines whether or not a reply request has been received (S16), and receives a reply request from the PC 82 (S16: YES). The set value is transmitted to the PC 82 (S17). On the other hand, after transmitting a reply request (S15), the PC 28 determines whether there is a reply of main body data and setting values from the main body 1A (S18). If there is no reply (S18: NO), the PC 82 performs a communication abnormality process similar to S6, and displays a message indicating that the setting value has not been successfully set and a message prompting the user to set the driving mode again. (S19), and the process returns to S10.

  When there is a reply (S18: YES), the PC 82 determines whether or not the main body data and the setting value stored in the RAM of the main body 82A match the main body data and the setting value received from the main body 1A ( S20). When it is determined that they match (S20: YES), a message indicating that the setting value (driving mode) has been successfully set is displayed on the display 82B (S21), and the count number of communication abnormality processing is reset and set. The process ends. On the other hand, if it is determined that they do not match (S20: NO), the same process as the process of S19 is performed, and the process returns to S10.

  As described above, four control modes are selected and stored as drive modes in the EEPROM 80 of the electronic pulse driver 1. The electronic pulse driver 1 is driven based on one drive mode selected by the changeover switch among the four drive modes. Therefore, the electronic pulse driver 1 can be operated based only on the control mode selected by the user. Therefore, it is possible to provide the electronic pulse driver 1 that meets the user's request. Further, as described above, the drive mode can be changed by connecting the main body 1A to the PC 82.

  The electronic pulse driver of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  For example, although four control modes are stored in the EEPROM 80 as drive modes, the number of drive modes is not limited to four. In addition, although the EEPROM 80 stores the number corresponding to the control mode as the drive mode, the control mode itself may be stored as the drive mode.

1. Electronic pulse driver 3. Motor 3. Rotor 4. Hammer part 5. Anvil part 7. Control part 78. Calculation unit 80. EEPROM
81 .. External connection terminal

Claims (2)

A motor,
A tip tool drive unit driven by the motor;
First storage means for storing a plurality of control modes for controlling the motor;
Second storage means for storing a part of the plurality of control modes as a plurality of drive modes;
And a control unit that controls the motor based on the plurality of drive modes. An external device connection part that can be connected to an external device
The said 2nd memory | storage means memorize | stores this one part control mode transmitted from this external apparatus connected to this external apparatus connection part as these drive modes. Electric tool.

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