JP2008213052A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent set values such as torque or rotational frequency from being changed inadvertently. <P>SOLUTION: A power tool of the embodiment comprises a tool body A whose set values of torque and rotational frequency are variable, and a setting device B for setting the set values of the tool body A. Since the set values (set torque value and set rotational frequency value) stored in a memory 3 of the tool body A can be set only by the setting device B separate from the tool body A, the set values such as the torque or the rotational frequency are not inadvertently changed during operation unlike conventional ones. As a result, reliability in operation such as torque control, and working efficiency are improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power tool used for tightening work such as screws and bolts.

2. Description of the Related Art Conventionally, electric tools with variable set values such as torque (tightening torque) and rotation speed (motor rotation speed) have been provided. For example, in the conventional example disclosed in Patent Document 1, if a desired set value (torque value) is set with a torque setting switch provided on the tool body, the tightening torque of a fastener such as a screw or bolt is set to the set value. By stopping the motor when reaching the value, excessive tightening can be prevented.
JP 2007-1013 A

  By the way, in the above-described conventional example, the torque value is set by the torque setting switch provided on the tool body of the electric power tool. Therefore, the torque setting switch is erroneously operated during work, and an unintended setting value (torque value). There was a risk of being changed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric tool in which setting values such as torque and rotation speed are not changed carelessly during work.

  In order to achieve the above object, the invention of claim 1 comprises a tool body in which set values such as torque and rotation speed are variable, and a setter for setting the set values for the tool body. Is a motor, a wireless signal receiving unit that receives a wireless signal using light or radio waves, a storage unit that stores a set value, and a storage unit that stores the set value received by the wireless signal in the storage unit. Control means for controlling the operation of the motor based on the stored setting value, and the setting device has received the operation input by the operation input receiving means for receiving the operation input of the setting value and the operation input receiving means. And wireless signal transmitting means for transmitting the set value by the wireless signal.

  According to a second aspect of the present invention, in the first aspect of the invention, the tool main body is provided with display means for displaying the set value stored in the storage means.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the control means of the tool main body is a unique identification code in which the identification code included in the wireless signal received by the wireless signal receiving means is stored in the storage means in advance. The setting value received by the wireless signal is stored in the storage means only when it matches.

  The invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the control means of the tool body stores the set value in the storage means only when the motor is stopped. .

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the tool body receives work completion notification receiving means for notifying completion of work by the operator, and receives work completion notification. Wireless signal transmitting means for transmitting the work completion notice received by the means to the setting device by the wireless signal, the setting device comprises wireless signal receiving means for receiving the wireless signal, and the wireless signal transmitting means of the setting device comprises: A wireless signal including the setting value is transmitted when the work completion notification is received by a wireless signal received by a wireless signal receiving means.

  According to the first aspect of the present invention, since the set value stored in the storage means of the tool body can be set only by a setting device different from the tool body, set values such as torque and rotation speed are inadvertent during work. Will not be changed. As a result, work reliability such as torque management and work efficiency can be improved.

  According to the second aspect of the present invention, the setting value received by the wireless signal from the setting device can be confirmed by displaying on the display means of the tool main body, and the work reliability can be improved.

  According to the invention of claim 3, by transmitting a wireless signal including an identification code, it is possible to set a set value for a plurality of tool bodies with a single setting device, thereby improving the efficiency of setting work. Can be planned.

  According to the fourth aspect of the present invention, it is possible to prevent the setting value from being changed during use of the tool body, that is, during the operation of the motor, thereby improving work reliability.

  According to the invention of claim 5, since the setting value can be changed by the setting device when the work completion notification is received from the tool main body, the work reliability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  The electric power tool according to the present embodiment includes a tool main body A in which set values of torque and rotation speed are variable, and a setting device B that sets the set values for the tool main body A. The tool body A includes a motor 1, a wireless signal transmission / reception unit 2 that transmits and receives a wireless signal using infrared light as a medium, a non-volatile memory 3 that stores setting values, and a setting value received by the wireless signal in the memory 3. And a control unit 4 that controls the operation of the motor 1 based on the set value stored in the memory 3 and an operation input receiving unit 5 that includes switches such as pushbutton switches and receives an operation input by an operator. A display unit 6 having a light emitting element such as a light emitting diode, a battery (secondary battery) 7 as a power source for each unit, and adjusting the power supply from the battery 7 to the motor 1 under the control of the control unit 4 1, a torque sensor 9 that detects torque (tightening torque) output from the motor 1 to the output shaft via a speed reduction mechanism (not shown), and a rotation of the motor 1. And a rotational speed sensor 10 for detecting the number. The wireless signal transmitting / receiving unit 2 includes a light emitting element (not shown) such as a light emitting diode that emits infrared light, and a light receiving element such as a phototransistor that receives infrared light, and drives and controls the light emitting element and the light receiving element. Thus, since wireless signals using infrared light as a medium are transmitted and received and can be realized by a conventionally known technique, detailed description and illustration are omitted.

  Further, the operation input receiving unit 1 includes a trigger switch, a forward / reverse switching switch, a work completion switch (not shown) and the like (not shown), and each operation input (for example, the operation state of the trigger switch and the forward / reverse rotation). The switch state, the operation state of the work completion switch, etc.) are received and output to the control unit 4. The control unit 4 includes a microcomputer as a main component, and controls the motor driving unit 8 to start the motor 1 when the trigger switch is operated, and sets a preset value (torque set value) stored in the memory 3 in advance. In addition, the rotational speed setting value) is compared with the detected torque value detected by the torque sensor 9 and the detected rotational speed value detected by the rotational speed sensor 10, and is supplied from the battery 7 to the motor 1 so as to reduce the respective differences. Control (feedback control) is performed to adjust the torque and the number of rotations of the motor 1 by a method such as controlling current to be generated. Here, the control unit 4 displays the set value stored in the memory 3 on the display unit 6. Specifically, the control unit 4 adjusts the number of light emitting elements that emit light simultaneously according to the set value. 4 controls the display unit 6. When the forward / reverse switching switch is switched to the reverse side, the control unit 4 reverses the motor 1 by switching the connection direction of the motor driving unit 8 and the motor 1.

  As shown in FIG. 1, the setting device B is an operation input receiving unit 20 that receives an operation input of a set value, a control unit 21 having a microcomputer as a main component, a liquid crystal display (LCD) panel 22a, and driving of the LCD panel 22a. A display unit 22 having a circuit (not shown), a wireless signal transmission / reception unit 23 that transmits and receives a wireless signal using infrared light as a medium, and a battery 24 for supplying power to each unit are excluded. Each part is mounted on a printed wiring board and is configured to be accommodated in a container 30 made of a flat, substantially rectangular parallelepiped synthetic resin molded product. The operation input receiving unit 20 includes a plurality of pushbutton switches and a plurality of operation buttons 31a to 31e disposed on the lower side from the longitudinal center on the front surface of the body 30, and the operation buttons 31a to 31e are pressed. When a unique push button switch is turned on sometimes, an operation input corresponding to each of the operation buttons 31 a to 31 e is received and output to the control unit 21. Further, the LCD panel 6 of the display unit 22 is exposed from the center in the longitudinal direction on the front surface of the container 30. Further, a cover 32 made of a synthetic resin material that transmits infrared light is attached to the upper end of the container 30 in the longitudinal direction, and the light emitting element and the light receiving element of the wireless signal transmitting / receiving unit 23 are located inside the cover 32. It is arranged.

  When the power is turned on, the control unit 21 of the setting device B controls the display unit 22 to display the menu screen first. This menu screen is a screen for selecting an ID number, a torque, and a rotational speed that are unique identification codes assigned to a plurality of tool bodies A as shown in FIG. Each time the operation button 31a) is pressed and an operation input is received by the operation input receiving unit 20, the selection is switched by the control unit 21. Of the three items (ID number, torque, and rotation speed), only the currently selected item is highlighted on the screen of the LCD panel 6.

  Here, a procedure for setting set values of torque and rotation speed in the tool body A using the setting device B will be described.

  First, when the operation button 31a is pressed and the item “ID number” is selected (highlighted) while the menu screen is displayed, the “ID number” The item selection is confirmed, and the control unit 21 displays the already registered ID numbers (= 1, 2,...) On the screen of the LCD panel 6. When the operation button 31b is pressed in this state, the ID number displayed on the screen of the LCD panel 6 is sequentially incremented. When the operation button 31c is pressed, the ID number displayed on the screen of the LCD panel 6 is It moves down sequentially. Then, if the operation button 31d is pressed with the target ID number displayed, the selection of the ID number is confirmed, and the control unit 21 returns the screen display of the LCD panel 6 to the menu screen.

  Subsequently, when the operation button 31d is pressed to operate the operation button 31d while the operation button 31d is selected (inverted display), the “torque” item selection is confirmed. A numerical value that can be set as torque is displayed on the screen of the LCD panel 6. When the operation button 31b is pressed in this state, the numerical value (torque) displayed on the screen of the LCD panel 6 is sequentially incremented, and when the operation button 31c is pressed, the numerical value displayed on the screen of the LCD panel 6 (Torque) is gradually lowered. Then, when the operation button 31d is pressed with the desired numerical value displayed, the numerical value is determined as the torque setting value, and the control unit 21 returns the screen display of the LCD panel 6 to the menu screen.

  Further, if the operation button 31d is pressed while the operation button 31a is pressed to select (reverse display) the item “rotation number”, the item selection of “number of rotations” is confirmed, and the control unit 21 Then, a numerical value that can be set as the rotation speed is displayed on the screen of the LCD panel 6. When the operation button 31b is pushed in this state, the numerical value (number of rotations) displayed on the screen of the LCD panel 6 is sequentially increased, and when the operation button 31c is pushed, it is displayed on the screen of the LCD panel 6. The numerical value (number of rotations) decreases sequentially. If the operation button 31d is pressed while the desired numerical value is displayed, the numerical value is determined as the rotation speed setting value, and the control unit 21 returns the screen display of the LCD panel 6 to the menu screen. When the input of the ID number, torque setting value, and rotation speed setting value is completed and the operation button 31e is pressed, the control unit 21 receives the ID number, torque setting value, and rotation speed setting value from the wireless signal transmission / reception unit 23. Each data is transmitted by wireless signal.

  On the other hand, in the tool body A, when the wireless signal transmission / reception unit 2 receives the wireless signal, the control unit 4 determines whether or not the ID number transmitted by the wireless signal matches the own ID number stored in the memory 3. If it does not match, the received data is discarded, and if it matches, the received data (torque setting value and rotation speed setting value) is stored in the memory 3, and the setting value is displayed by controlling the display unit 6. Let In this way, the setting operation of the torque setting value and the rotation speed setting value for the tool body A is completed.

  As described above, according to the present embodiment, the setting values (torque setting value and rotation speed setting value) stored in the memory 3 of the tool body A can be set only by the setting device B different from the tool body A. Thus, unlike the conventional example, set values such as torque and rotation speed are not changed carelessly during work, and as a result, work reliability such as torque management and work efficiency can be improved. Further, the setting value received from the setting device B by the wireless signal can be confirmed by displaying it on the display unit 6 of the tool main body A, and the work reliability can be improved. In addition, since an identification code (ID number) for identifying the tool body A is included in the data transmitted by the wireless signal, a set value is set for a plurality of tool bodies A by one setter B. This makes it possible to improve the efficiency of the setting work. Note that if the set value is changed while the tool main body A is being used, that is, during the operation of the motor 1, the reliability of work such as torque management is reduced, so the control unit 4 of the tool main body A has its own ID. Even if the wireless signal addressed to the number is received, the set value in the memory 3 is not updated during the operation of the motor 1, and the set value in the memory 3 is updated after the motor 1 is stopped.

  By the way, even if the motor 1 is stopped, if the set value is changed while the worker is working, the reliability of work such as torque management may be reduced. Therefore, a work completion switch is provided in the operation input receiving unit 5 of the tool body A, and the operator operates the work completion switch so that a work completion operation input (work completion notification) is output from the operation input receiving unit 5 to the control unit 4. When the control unit 4 controls the wireless signal transmission / reception unit 2 to transmit the work completion notification data to the set value B by a wireless signal, the setting unit B receives the work completion notification by the wireless signal. If the control unit 21 transmits the setting value data and the like from the wireless signal transmission / reception unit 23 as a wireless signal, it is possible to prevent the setting value from being changed during the work and to improve the reliability of work such as torque management.

  In the present embodiment, infrared light is exemplified as a signal medium for a wireless signal, but a wireless signal using a radio wave as a signal medium may be used.

It is a block diagram which shows embodiment of this invention. It is an external view of the setting device in the same as the above.

Explanation of symbols

A tool body B setting device 1 motor 2 wireless signal transmission / reception unit 3 memory 4 control unit 5 operation input reception unit 6 display unit 20 operation input reception unit 21 control unit 23 wireless signal transmission / reception unit

Claims (5)

It consists of a tool body with variable setting values such as torque and rotation speed, and a setter that sets the setting values for the tool body.
The tool main body stores a motor, a wireless signal receiving unit that receives a wireless signal using light or radio waves as a medium, a storage unit that stores a setting value, and the storage unit that stores the setting value received by the wireless signal. Control means for controlling the operation of the motor based on the set value stored in the means,
The setting device includes: an operation input receiving unit that receives an operation input of the set value; and a wireless signal transmission unit that transmits the setting value received by the operation input receiving unit using the wireless signal. Electric tool.   The electric power tool according to claim 1, wherein the tool body includes display means for displaying the set value stored in the storage means.   The control means of the tool body stores the setting value received by the wireless signal only when the identification code included in the wireless signal received by the wireless signal receiving means matches the unique identification code stored in the storage means in advance. The power tool according to claim 1, wherein the power tool is stored in a means.   The power tool according to any one of claims 1 to 3, wherein the control means of the tool body stores the set value in the storage means only when the motor is stopped. The tool main body is a work completion notification receiving means for receiving a work completion notification for notifying completion of work by an operator, and a wireless signal transmitting means for transmitting the work completion notification received by the work completion notification receiving means to the setting device by the wireless signal. And
The setting device includes wireless signal receiving means for receiving the wireless signal,
The wireless signal transmitting means of the setting device transmits a wireless signal including the set value when the work completion notification is received by a wireless signal received by the wireless signal receiving means. The electric tool according to claim 1.

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