JP7363609B2 - Work tools - Google Patents

Description

The present invention relates to a power tool such as an electric screwdriver, a grinder, a jigsaw, a chain saw, etc., in which a tip tool is driven by electric power or air to perform various tasks.

2. Description of the Related Art At work sites and factories, work tools are widely used in which a tip tool such as a drill or a driver is rotated by a motor to perform a desired work (for example, see Patent Document 1).
Some of these power tools include an auxiliary handle attached to the main body so that the user can use the power tool in a stable manner.
For example, in Patent Document 1, in order to prevent accidents such as injury due to the user not holding the auxiliary handle firmly, the output torque is limited by detecting the grip of the auxiliary handle by the user. Disclosed is a power tool that performs the following steps.

Patent No. 5899471 Patent No. 5914809

However, the conventional power tool described above has the following problems.
That is, the power tool disclosed in the above-mentioned publication does not take into account differences in the skills of individual users (those who are good at operating the power tool and those who are not good at it). For this reason, if the force with which the user grips the auxiliary handle differs, there is a risk that the output torque will be contrary to the operator's intention, depending on individual skill differences.

An object of the present invention is to provide a power tool that can perform highly safe and appropriate control depending on the skill difference of the user.

The work tool according to the first invention is a work tool that performs a predetermined work by driving an attached tip tool, and includes a main body part, a power supply part, a motor, a power supply information detection part, and a control part. , is equipped with. The power supply section is provided in the main body section and supplies electric power. The motor is provided in the main body, and is supplied with electric power from the power supply section to drive the tip tool. The power supply information detection section is provided in the main body and detects information about the power supply section before and during work. The control section is provided in the main body section and controls the operation of the motor according to the skill level of the user estimated based on the information of the power supply section detected by the power supply information detection section.

Here, the user's skill level is estimated based on the information of the power supply unit before and during work detected by the power supply information detection unit, and the operation of the motor is controlled according to the estimated result.
Here, the information on the power supply unit before and during work detected by the power supply information detection unit includes, for example, a change in voltage during work from the voltage immediately before starting work (reduced voltage), a change in the voltage of the power supply unit during work, This includes temperature changes (increased temperature), control details of the power supply control section provided in the power supply section (control commands in response to voltage drops), etc.

In addition, the estimation of the skill level of the user based on the information of the detected power supply section is based on, for example, the load (voltage drop A rule of thumb is that when work is performed by a user with a low skill level, the load on the power supply (voltage drop, temperature rise, etc.) tends to be large due to unstable use of the power tool. Based on.

As a result, the operation of the motor is controlled according to the skill level estimated based on the results of detecting information on the power supply section before and during work. The threshold value set to stop the motor operation is set higher, and the threshold set to stop the motor operation is lowered for safety reasons for users with a low skill level. It is possible to implement controls such as:
As a result, highly safe and appropriate control can be performed depending on the skill difference of the user.

The work tool according to the second invention is the work tool according to the first invention, wherein the control section stops the operation of the motor according to the skill level of the user estimated based on the information of the power supply section. Select the threshold value set to
Here, the threshold value set for stopping the operation of the motor is selected depending on the skill level of the user estimated based on the information of the power supply section.
As a result, for users with a high skill level, the threshold value set for stopping the motor operation is set high, and for users with a low skill level, the threshold value set for stopping the motor operation is set high, and for users with a low skill level, the threshold value set for stopping the motor operation is set high. Control such as lowering the threshold value set for stopping the operation can be implemented.

A work tool according to a third invention is the work tool according to the second invention, wherein the control section has a plurality of work modes including a threshold value set for stopping the operation of the motor. It is determined whether or not to change from the currently set first working mode to the second working mode, depending on the skill level of the user estimated based on the information of the power supply unit.

Here, the current working mode (first working mode) including a threshold value set for stopping the operation of the motor is set according to the skill level of the user estimated based on the information of the power supply unit. It is determined whether to change to another work mode (second work mode) in which a threshold value of a different value is set.
As a result, if the estimated skill level is high, a work mode with a high threshold set for stopping motor operation is selected, and if the estimated skill level is low, safety is taken into consideration. Then, a working mode with a lower threshold value set for stopping the operation of the motor can be selected.

A power tool according to a fourth invention is a power tool according to the third invention, in which the control unit is configured to perform estimation when the information of the power supply unit exceeds a predetermined threshold by the first time threshold. Change the work mode according to the skill level of the user.
Here, for example, if the information of the power supply unit, such as a change in voltage, exceeds a predetermined threshold by the first time threshold, the estimated skill level is considered to be low because the power consumption is more than necessary. A work mode corresponding to the lower skill level is selected.

Thereby, by changing the work mode in accordance with the estimated skill level of the user, it is possible to ensure safety during work for a user with a low skill level.

A power tool according to a fifth invention is a power tool according to the fourth invention, wherein the control unit is configured such that the information of the power supply unit exceeds a predetermined threshold by a second time threshold that is longer than the first time threshold. If so, stay in work mode.
Here, for example, although information on the power supply unit such as a change in voltage (decreased voltage value) or a change in temperature (increased temperature) from the voltage immediately before the work did not exceed a predetermined threshold by the first time threshold, If the predetermined threshold is exceeded by the second time threshold, which is longer than the first time threshold, the skill level is determined to be normal and the current work mode is maintained.
Thereby, by maintaining the work mode in accordance with the estimated skill level of the user, it is possible to have the user perform work in a work mode suitable for a user with a normal skill level.

A power tool according to a sixth invention is the power tool according to the fourth invention, wherein the control section is configured to control the power supply section so that the information of the power supply section is set within a predetermined time period longer than the first time threshold value by a second time threshold value. If the threshold value is not exceeded, the work mode is changed according to the estimated skill level of the user.
Here, for example, information on the power supply unit such as a change in voltage (decreased voltage value) or a change in temperature (increased temperature) from the voltage immediately before the work is detected by a predetermined time threshold that is longer than the first time threshold. If the threshold value is not exceeded, it is determined that the skill level is high, and a work mode corresponding to a higher skill level is selected from the current work mode.

Thereby, by changing the work mode in accordance with the estimated skill level of the user, it is possible to provide comfort during work to a user with a high skill level.

A working tool according to a seventh invention is the working tool according to any one of the first to sixth inventions, wherein the information on the power supply unit includes a change in voltage from the voltage immediately before the work during work, It also includes temperature changes, control details of the power supply control unit that controls the power supply unit, etc.
Here, the information on the power supply section detected by the power supply information detection section includes changes in voltage from the voltage immediately before work (voltage value decreased during work), or temperature changes (temperature increased during work). ), the control details of the power supply control unit that controls the power supply unit (control commands in response to voltage drop, etc.) are included.
As a result, the skill level of the user can be easily estimated by detecting changes in voltage from the voltage immediately before work, changes in temperature, and control details of the power supply control section that controls the power supply section.

The work tool according to an eighth invention is the work tool according to any one of the first to seventh inventions, and is an auxiliary handle that is attached to the main body and held by the user during work. The auxiliary handle further includes a grip detection section that detects the grip force with which the user grips the auxiliary handle, and a transmission section that transmits the detection result of the grip detection section to the main body.

Here, in a work tool that includes an auxiliary handle that is attached to the main body in order to perform various tasks in a stable state by grasping the work tool with both hands, the gripping force used to hold the auxiliary handle is detected and transmitted to the main body. do.
Here, the auxiliary handle attached to the main body may be integrated with the main body, or may be detachable from the main body.
Thereby, it is possible to perform control such as determining whether to stop the operation of the motor, for example, depending on the magnitude of the force with which the gripping portion is gripped.

A working tool according to a ninth invention is the working tool according to the eighth invention, further comprising a receiving section that is provided in the main body and receives the detection result of the grip detection section transmitted from the transmitting section. We are prepared. The control unit determines whether to stop the operation of the motor depending on the detection result from the grip detection unit.

Here, in a power tool equipped with an auxiliary handle, it is determined whether or not to stop the operation of the motor depending on the force with which the user grips the grip part.
Thereby, for example, operation of the motor can be permitted only if the detected gripping force of the holding handle is within a permissible range.
Therefore, when the gripping force is smaller than a predetermined value, the operation of the motor is prohibited, thereby improving the safety of the user.
As a result, user safety can be ensured, and appropriate control can be performed taking into account differences in user skill.

The working tool according to the tenth invention is the working tool according to the eighth or ninth invention, wherein the power supply is provided in the main body and supplies power to the auxiliary handle in a non-contact manner. It also has a section. The auxiliary handle includes a non-contact power receiving section that receives power supplied from the non-contact power feeding section.

Here, the auxiliary handle attached to the main body is supplied with power from the main body by a non-contact power supply method.
As a result, compared to a configuration in which power is supplied to the auxiliary handle using a contact point, the contact part is not exposed, which prevents short circuits and rust from occurring at the exposed contact part when the auxiliary handle is not attached. can.
As a result, in a configuration including an auxiliary handle, the device can be used without being restricted by the usage environment.

A power tool according to an eleventh invention is a power tool according to any one of the first to tenth inventions, further comprising a behavior detection section that detects behavior of the main body.
Here, in order to detect the behavior (shake) of the power tool that occurs during work, a behavior detection unit such as an acceleration sensor or a gyro sensor is provided.
Thereby, control such as stopping the operation of the motor can be implemented based on the detection result of the behavior (shaking) of the power tool that occurs during work.

A power tool according to a twelfth invention is a power tool according to the eleventh invention, in which the control section determines whether or not to permit operation of the motor based on the behavior detection result in the behavior detection section. .

Here, the behavior (shaking) of the power tool that occurs during work is detected, and based on the detection result, it is determined whether or not to permit operation of the motor.
As a result, operation of the motor can be permitted only when the behavior (shaking) of the power tool that occurs during work is within a permissible range.
Therefore, when the work tool is shaken by a predetermined amount or more during work, the operation of the motor is prohibited, thereby improving the safety of the user.

A power tool according to a thirteenth invention is a power tool according to the eleventh or twelfth invention, in which the control section controls the detection result in the behavior detection section to stop the operation of the motor if the detection result exceeds even once. The second threshold value is smaller than the first threshold value and stops the operation of the motor when the threshold value is exceeded a predetermined number of times within a predetermined time.
Here, in the control to stop the motor operation according to the detection result in the behavior detection section, two threshold values are set: a first threshold value that causes the motor to stop when detected once, and a second threshold value that causes the motor to stop when it is detected a predetermined number of times or more. There is.

As a result, the detection result (amount of wobbling of the work tool) detected by the behavior detection unit is set to a first threshold value that immediately stops the motor operation, and a second threshold value that stops the motor operation after a predetermined number of detections or more. By using this in combination, if the amount of vibration is larger than the first threshold, the operation of the motor is immediately stopped, and if the amount of vibration is smaller than the first threshold and larger than the second threshold, the second It can be stopped when the amount of shaking is detected that is equal to or greater than a threshold value.
As a result, it is possible to implement stepwise control in which the work tool is stopped immediately or stopped when a predetermined condition is met, depending on the amount of wobbling of the work tool.

A power tool according to a fourteenth invention is a power tool according to any one of the eleventh to thirteenth inventions, wherein the control unit controls the motor to output low torque at a high rotational speed. It has a low torque mode and a low speed high torque mode in which the motor is controlled to output higher torque at a lower rotational speed than the high speed low torque mode.

Here, the control unit controls the motor in a high-speed, low-torque mode and a low-speed, high-torque mode that are selected depending on the work content and the like.
Here, the high speed, low torque mode is selected, for example, in a screw tightening operation using an electric screwdriver, and the low speed, high torque mode is selected, for example, in a polishing operation, etc. using a disk grinder.
Thereby, by selecting an appropriate mode depending on the content of the work using the power tool, the work can be performed at the optimal rotational speed and output torque for the work.

The power tool according to a fifteenth invention is the power tool according to the fourteenth invention, wherein the control section sets the detection result detected by the behavior detection section in the high-speed low-torque mode in the low-speed high-torque mode. Set a threshold value that is smaller than the threshold value that stops the operation of the motor.

Here, as the threshold value for stopping the operation of the motor, a smaller threshold value is set in the low speed high torque mode than in the high speed low torque mode.
As a result, the threshold for the amount of vibration in low-speed, high-torque mode, where there is a high risk of accidents such as injury due to the user not holding the auxiliary handle firmly, is set to a smaller value than in high-speed, low-torque mode. It is possible to perform highly safe control such as stopping the operation of the motor as soon as a shake occurs.

A power tool according to a sixteenth aspect of the present invention is a power tool according to the fourteenth or fifteenth aspect of the present invention, further comprising an auxiliary handle having a grip detection section that detects the grip force gripped by the user. In at least one of the high-speed, low-torque mode and the low-speed, high-torque mode, the gripping force threshold is set in multiple stages based on the detection result of the gripping detector.
Here, in at least one of the high-speed, low-torque mode and the low-speed, high-torque mode, threshold values related to the force for gripping the auxiliary handle are set in stages.
Thereby, by setting appropriate modes and stages according to the content of the work and performing the work, it is possible to appropriately perform work using the work tool while ensuring the safety of the user.

A working tool according to a seventeenth invention is a working tool according to the sixteenth invention, in which the behavior detection section is provided in the auxiliary handle.
Here, a behavior detection unit such as an acceleration sensor is provided on the auxiliary handle side, and indirectly detects behavior (shaking) that occurs in the main body during work.

As a result, by detecting the behavior (shake) on the auxiliary handle side, the behavior (shake) on the main body side can be indirectly detected, and it can be determined whether or not to stop the motor operation according to the amount of vibration. I can do it.

A power tool according to an eighteenth invention is a power tool according to the seventeenth invention, in which the behavior detection section is provided near an end of the auxiliary handle on the opposite side to the connection portion with the main body.
Here, a behavior detection section such as an acceleration sensor is arranged at the end of the auxiliary handle.
As a result, the amount of movement of the auxiliary handle can be accurately detected by placing the behavior detection unit at the end (opposite the connection side) where the amount of displacement is greatest when the auxiliary handle shakes. be able to.

A working tool according to a nineteenth invention is a working tool according to any one of the eleventh to eighteenth inventions, in which the behavior detection section is an acceleration sensor.
Here, an acceleration sensor is used as the behavior detection section.
Thereby, with an inexpensive configuration, it is possible to detect vibrations occurring in the power tool.

According to the power tool according to the present invention, it is possible to perform appropriate control with high safety according to differences in skill between users.

1 is an overall perspective view showing the configuration of a power tool according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the auxiliary handle of the power tool of FIG. 1 is removed from the main body. FIG. 2 is a control block diagram of the power tool in FIG. 1. FIG. (a) and (b) are perspective views showing the arrangement of pressure sensors provided on the auxiliary handle of FIG. 1; (a) and (b) are cross-sectional views showing a connection structure between the auxiliary handle and the main body portion of FIG. 4(a). (a) and (b) are sectional views showing the configuration of a locking mechanism that maintains the connection between the auxiliary handle and the main body of FIG. 2; (a) and (b) are cross-sectional views showing the configuration of a lock release mechanism that releases the connection between the auxiliary handle and the main body portion of FIG. 2; 2 is a flowchart showing a process flow of operation permission control based on a grip value when the auxiliary handle is gripped in the power tool of FIG. 1; 2 is a flowchart showing a process flow of setting control of a work mode according to a voltage change of a power supply unit during work in the power tool of FIG. 1; 10 is a graph showing the relationship between the voltage difference and the passage of time described in the work mode setting control process of FIG. 9; FIG. 2 is a diagram showing a work mode set for the power tool of FIG. 1, a corresponding operation permission threshold, a range of operation permission grip values, a first behavior detection threshold, and a second behavior detection threshold. 2 is a flowchart illustrating a process flow of update control of an operation permission threshold based on a behavior detection signal detected by an acceleration sensor in the power tool of FIG. 1. FIG. (a) to (c) are graphs illustrating update control of the operation permission threshold in FIG. 12. 2 is a flowchart showing a process flow of setting control of a work mode according to a temperature change of a power supply unit during work in the power tool of FIG. 1; (a) is a graph showing the relationship between the temperature of the power supply section and the passage of time, which was explained in the process of setting control of the work mode in FIG. 14, when used by a user with low skill. (b) is a table showing the relationship between the flag No. that is turned ON every 5 seconds and the detected temperature of the power supply unit. (a) is a graph showing the relationship between the temperature of the power supply section and the passage of time, which was explained in the process of setting control of the work mode in FIG. 14, when used by a highly skilled user. (b) is a table showing the relationship between the flag No. that is turned ON every 5 seconds and the detected temperature of the power supply unit.

The electric tool (work tool) 10 according to an embodiment of the present invention will be described below using FIGS. 1 to 16(b).
Note that the content described below merely shows one embodiment of the present invention, and the present invention is not intended to be limited by the configuration described in this embodiment.

(1) Configuration of the power tool 10 As shown in FIG. 1, the power tool 10 according to the present embodiment is mounted on the tip portion by a brushless motor (motor 17) that is supplied with power from a battery (not shown). By rotating the tip tool 30 such as a screwdriver or drill, it is used for various operations such as screw tightening, screw loosening, and hole drilling.
As shown in FIGS. 1 and 2, the power tool 10 includes a main body 11 and an auxiliary handle 20 that is detachably attached to the main body 11.

(2) Configuration of main body section 11 The main body section 11 includes a motor 17 that is driven by power supplied from a built-in battery (not shown), and various types of motors that are detachably attached to the tip. Various operations are performed while exchanging the tip tool 30.
As shown in FIG. 1, the main body section 11 includes a rotating section 12, which has a tip tool 30 attached to its tip and is rotationally driven by a motor 17 (see FIG. 3), and a main handle that is held by the user's right hand during work. 13, an operating section (trigger switch) 14 that drives a motor 17 (see FIG. 3) according to the amount of operation, and a connected section 15 to which an auxiliary handle 20 is attached. Further, as shown in FIG. 3, the main body section 11 includes a control section 16, a motor 17, a non-contact power supply section 18a, a power supply section 18b, and a signal reception section (receiving section) 19. There is.

As shown in FIG. 1, the rotating portion 12 is provided at the tip of the main body portion 11 to which the tip tool 30 is attached. The rotary unit 12 is rotationally driven by a motor 17 (see FIG. 3), thereby performing various operations depending on the tip tool 30 attached thereto.
As shown in FIG. 1, the main handle 13 is a part of the user's hand that extends downward from the lower surface of the main body 11, and is held by the user's right hand during operation in the power tool 10 shown in FIG. Ru.

As shown in FIG. 1, the operating section (trigger switch) 14 is provided near the base of the main handle 13, and is operated by the index finger of the user's right hand while gripping the main handle 13 during work. Then, as shown in FIG. 3, the operation section 14 transmits an operation signal according to the amount of operation to the control section 16. Thereby, the control section 16 drives the motor 17 so that the rotation speed corresponds to the amount of operation of the operation section 14 .

As shown in FIG. 2, the connected portion 15 is a substantially cylindrical portion provided on the left side surface of the main body portion 11, and the auxiliary handle 20 is attached thereto. The connected portion 15 has a cylindrical portion 15a, an attachment/detachment button 15b, and an insertion hole 15c.
As shown in FIG. 2, the cylindrical portion 15a is arranged substantially perpendicular to the left side surface of the main body portion 11, and is attached to the inner peripheral surface of the cylindrical portion with the auxiliary handle 20 inserted therein. Furthermore, a first recess (alignment section) 15aa and a second recess (alignment section) 15ab, which are recessed toward the outside in the radial direction, are formed on the inner circumferential surface of the cylindrical portion 15a.

As shown in FIG. 2, the first recess 15aa is formed on the inner circumferential surface of the cylindrical portion 15a, into which the first convex portion 23aa formed on the outer circumferential surface of the cylindrical portion 23 on the side of the auxiliary handle 20 is inserted. .
As shown in FIG. 2, the second recess 15ab is formed at a position facing the first recess 15aa on the inner circumferential surface of the cylindrical portion 15a, and is formed on the outer circumferential surface of the cylindrical portion 23 on the side of the auxiliary handle 20. The second convex portion 23ab is inserted.

Here, the first recess 15aa is formed to have a smaller groove width (dimension in the direction intersecting the insertion direction) than the second recess 15ab.
As shown in FIG. 2, the attachment/detachment button 15b is arranged on the outer circumferential surface of the cylindrical portion 15a, and when pressed down causes the auxiliary handle 20 to shift from a held state to a detachable state.

As shown in FIG. 2, the insertion hole 15c is a hole formed approximately at the center of the cylindrical portion 15a, into which the insertion shaft 22a on the side of the auxiliary handle 20 is inserted.
The control section 16 is connected to the operation section 14, the power supply section 18b, and the signal reception section 19, as shown in FIG. The control unit 16 then controls the rotation speed of the motor 17 based on the operation amount signal received from the operation unit 14 . The control unit 16 also receives a detection result (amount of shake) from the acceleration sensor 28 received via the signal receiving unit 19 and a grip detection signal (grip force ), it is determined whether or not the operation of the motor 17 is permitted.

The control unit 16 uses information such as a voltage change or temperature change of the power supply unit 18b during work detected by a voltage detection unit 18ba or a temperature sensor 18bb provided in the power supply unit 18b, which will be described later, to control the user, which will be described later. The drive control of the motor 17 is performed according to the estimation of the skill level.
As shown in FIG. 3, the motor 17 is driven by electric power and provides rotational driving force to the tip tool 30 (rotating part 12).

The non-contact power supply section 18a is supplied with power from the power supply section 18b, and as shown in FIG. Supply power without contact. Note that although the non-contact power supply section 18a and the power supply section 18b are omitted in FIG. 3, it is assumed that they are actually electrically connected.
The power supply section 18b is, for example, a battery that is replaceably attached to the main body section 11, and as shown in FIG. 3, supplies power to the control section 16 and the like. The power supply section 18b includes a voltage detection section (power supply information detection section) 18ba and a temperature sensor (power supply information detection section) 18bb.

The voltage detection unit 18ba detects the voltage value before the start of work and the voltage value decreased during the work, and transmits them to the control unit 16. Then, the control unit 16 calculates a voltage value that is the difference between the voltage value detected by the voltage detection unit 18ba before the work and the voltage value that decreased during the work, and calculates the voltage value that is the difference between the voltage value that has decreased during the work and The motor 17, which will be described later, is controlled according to the voltage value.
The temperature sensor 18bb detects the temperature of the power supply section 18b before the start of work and the temperature of the power supply section 18b that has increased during the work, and transmits them to the control section 16. Then, the control unit 16 calculates an increased temperature that is the difference between the temperature of the power supply unit 18b before work detected by the temperature sensor 18bb and the temperature of the power supply unit 18b that has increased during work, and The motor 17, which will be described later, is controlled depending on the temperature of the power supply section 18b.
As shown in FIG. 3, the signal receiving unit (receiving unit) 19 receives the detection results from the pressure sensor 25 and acceleration sensor 28 provided on the auxiliary handle 20 side via the signal transmitting unit 26 on the auxiliary handle 20 side. do.

(3) Configuration of the auxiliary handle 20 The auxiliary handle 20 is designed to be used so that the work can be performed in a stable state, for example, when the motor 17 outputs high-torque rotational driving force. gripped by the person's left hand. As shown in FIG. 1, the auxiliary handle 20 is detachably attached to the connected portion 15 provided on the left side surface of the main body portion 11.

Note that the auxiliary handle 20 may be configured to be attached to the right side of the main body 11, or other parts such as the upper and lower parts, instead of the left side of the main body 11 shown in FIG.
As shown in FIG. 1, the auxiliary handle 20 includes a grip part 21, a connecting part 22, and a cylindrical part 23. Furthermore, as shown in FIG. 3, the auxiliary handle 20 internally includes a non-contact power receiving section 24, a pressure sensor 25, a signal transmitting section (transmitting section) 26, a grip detection signal processing section 27, and an acceleration sensor ( (behavior detection unit) 28.

As shown in FIG. 1, the grip portion 21 is a portion of the auxiliary handle 20 that is gripped by the user's left hand, and is arranged to extend substantially perpendicularly to the left side surface of the main body portion 11. .
As shown in FIG. 2, the connecting portion 22 is a portion connected to the cylindrical portion 15a of the connected portion 15 of the main body portion 11, and has an insertion shaft 22a protruding toward the main body portion 11. There is.

The insertion shaft 22a is inserted into an insertion hole 15c provided at the center of the cylindrical portion 15a of the main body portion 11.
As shown in FIG. 1, the cylindrical portion 23 is inserted into the inner peripheral surface of the cylindrical portion 15a that constitutes the connected portion 15 of the main body portion 11. As shown in FIG. Thereby, the auxiliary handle 20 is aligned with the left side surface of the main body part 11. A first convex portion (alignment portion) 23aa and a second convex portion (alignment portion) 23ab are formed on the outer circumferential surface of the cylindrical portion 23, which protrude radially inward.

As shown in FIG. 2, the first convex portion 23aa is formed on the outer peripheral surface of the cylindrical portion 23, and is inserted along the first recess 15aa formed on the inner peripheral surface of the cylindrical portion 15a on the main body 11 side. be done.
As shown in FIG. 2, the second convex portion 23ab is formed on the outer circumferential surface of the cylindrical portion 23 on the opposite side of the first convex portion 23aa, and is formed on the inner circumferential surface of the cylindrical portion 15a on the main body portion 11 side. It is inserted along the second recess 15ab.

Here, the first protrusion 23aa is formed to have a smaller width (dimension in the direction intersecting the insertion direction) than the second protrusion 23ab.
As a result, the first convex portion 23aa and the second convex portion 23ab on the side of the auxiliary handle 20 are inserted along the first concave portion 15aa and the second concave portion 15ab on the main body portion 11 side, respectively. As a result, it is possible to position the auxiliary handle 20 in the rotational direction around the insertion shaft 22a.

Further, since the widths of the first convex portion 23aa and the second convex portion 23ab (the first concave portion 15aa and the second concave portion 15ab) are different, the auxiliary handle 20 cannot be attached even if the auxiliary handle 20 is rotated 180 degrees.
Therefore, it is possible to reliably position the auxiliary handle 20 in the rotational direction around the insertion shaft 22a.

As shown in FIG. 3, the non-contact power receiving section 24 is supplied with power from the non-contact power feeding section 18a of the main body section 11, and is connected to other components (pressure sensor 25, signal transmitting section 26, grip detection signal processing section 27, acceleration power to the sensor 28). As a result, the auxiliary handle 20 is supplied with electric power from the main body 11 side, so that it can have a simple configuration that does not have an internal power source such as a battery.

As shown in FIG. 3, the pressure sensor 25 is provided inside the grip part 21 of the auxiliary handle 20 that is gripped by the user, and detects whether the user has gripped the grip part 21 or not. The gripping force with which the object is being gripped is detected and transmitted to the grip detection signal processing section 27.
Here, as the pressure sensor 25, as shown in FIG. 4(a), a pressure sensor 25a is used which is disposed deep in the grip portion 21 of the auxiliary handle 20 so as to extend along the longitudinal direction. As a result, when the grip section 21 is gripped by the user, the pressure sensor 25 detects the grip and transmits a signal corresponding to the grip force to the grip detection signal processing section.

Note that the pressure sensor 25 may be a pressure sensor 25b disposed at the base of the auxiliary handle 20, as shown in FIG. 4(b).
As shown in FIG. 3, the signal transmitting unit (transmitting unit) 26 transmits a grip detection signal detected by the pressure sensor 25 and a behavior detection signal indicating the behavior (amount of shake) of the auxiliary handle 20 detected by the acceleration sensor 28. and is transmitted to the signal receiving section 19 of the main body section 11.

As shown in FIG. 3, the grip detection signal processing unit 27 performs a process of converting the grip detection signal detected by the pressure sensor 25 into a pulse signal.
The acceleration sensor (behavior detection unit) 28 is provided to detect the behavior of the auxiliary handle 20 (the amount of shaking that occurs during work), and as shown in FIG. 3, transmits the detected amount of shaking to the signal transmitting unit 26. do. Moreover, the acceleration sensor 28 is arranged at the end of the auxiliary handle 20, as shown in FIGS. 4(a) and 4(b).

As a result, compared to a configuration in which the acceleration sensor 28 is placed near the center of the power tool 10 (near the connection part), the behavior (amount of wobbling) of the auxiliary handle 20 that occurs during work can be detected more effectively. .

<Connection structure between main body part 11 and auxiliary handle 20>
The connection structure of the auxiliary handle 20 to the main body 11 in the power tool 10 of this embodiment will be described below with reference to FIGS. 5(a) and 5(b).
In the configurations shown in FIGS. 5(a) and 5(b), for convenience of explanation, the configuration on the main body 11 side shows only the connected part 15, and the configuration other than the connected part 15 is not shown. It is omitted.
That is, in this embodiment, the auxiliary handle 20 has the above-mentioned insertion shaft 22a on the side of the auxiliary handle 20 inserted into the insertion hole 15c on the side of the main body part 11, and the cylindrical part. The outer peripheral surface of 23 is inserted into the inner peripheral surface of the cylindrical portion 15a of the connected portion 15 of the main body portion 11.

At this time, due to the positioning effect of the above-mentioned positioning parts (the first and second recesses 15aa, 15ab and the first and second convex parts 23aa, 23ab), the non-contact power supply part 18a provided on the main body part 11 side and , and the non-contact power receiving section 24 on the side of the auxiliary handle 20 are arranged close to each other at positions facing each other, as shown in FIG. 5(b).
Thereby, it is possible to improve the power feeding efficiency from the non-contact power feeding section 18a to the non-contact power receiving section 24.

Further, due to the positioning effect of the above-mentioned positioning parts (the first and second recesses 15aa and 15ab and the first and second convex parts 23aa and 23ab), the signal receiving part 19 provided on the main body part 11 side and the auxiliary The signal transmitting section 26 on the handle 20 side is arranged close to and facing each other, as shown in FIG. 5(b).
Thereby, the signal transmission efficiency from the signal transmitter 26 to the signal receiver 19 can be improved.

<Lock mechanism for holding main body portion 11 and auxiliary handle 20>
In the power tool 10 of this embodiment, as shown in FIGS. 6(a) and 6(b), a locking portion (locking mechanism) 62b is provided at the tip of the insertion shaft 62a on the side of the auxiliary handle 20. A structure may be adopted in which a locked portion (lock mechanism) 56c is provided on the main body portion 11 side.
FIG. 6A shows the power tool 10 in a state immediately before the connecting portion 22 (cylindrical portion 23) on the auxiliary handle 20 side is connected to the connected portion 15 on the main body portion 11 side.

Here, the lock release button 56, which will be described later, is always urged outward in the radial direction around the central axis of the cylindrical portion 15a by an elastic member 56b such as a spring, and is in a state in which it is movable along the radial direction. and is provided on the main body portion 11 side. An insertion hole 56a into which the insertion shaft 62a is inserted is provided at the lower part of the lock release button 56.
When the connecting portion 22 of the auxiliary handle 20 is brought closer to the connected portion 15 of the main body portion 11 from the state shown in FIG. 6(a), the locking portion 62b provided at the tip of the insertion shaft 62a The lock release button 56 is inserted along the insertion hole 56a provided at the center of the cylindrical portion 15a of the main body portion 11.

At this time, the insertion shaft 62a has a locking portion 62b protruding radially inward at its distal end portion. The locking portion 62b has a tapered surface arranged diagonally with respect to the insertion direction at its distal end portion. Therefore, the insertion shaft 62a advances inside the insertion hole 56a while pressing the insertion hole 56a (lock release button 56) radially inward (downward in the figure) and is held at the position shown in FIG. 6(b).

In the state shown in FIG. 6(b), the rear end surface of the locking portion 62b protrudes in a direction crossing the insertion direction, and the locking portion 62b is inserted into It is caught and held by the edge portion (locked portion 56c) of the hole 56a.
As a result, the auxiliary handle 20 is held against the main body 11 and cannot be detached, so that the user can use the power tool 10 with the auxiliary handle 20 in a stable state.

On the other hand, when removing the auxiliary handle 20 attached to the main body part 11, as shown in FIG. The button 56 may be pressed down inward in the radial direction.
At this time, the lock release button 56 is pushed radially inward, so that the insertion hole 56a, which is a part of the lock release button 56, also moves radially inward.

As a result, the locked portion 56c provided at the edge of the insertion hole 56a also moves radially inward, thereby engaging the locked portion 62b provided at the tip of the insertion shaft 62a on the auxiliary handle 20 side. The locking relationship with the portion 56c is released.
As a result, the auxiliary handle 20 can be removed from the main body 11 by pulling out the insertion shaft 62a of the auxiliary handle 20 from the insertion hole 56a of the main body 11, as shown in FIG. 7(b).

<Operation permission control of motor 17 according to gripping force of auxiliary handle 20>
In the power tool 10 of this embodiment, operation permission control of the motor 17 is performed to perform work in a safer state with the auxiliary handle 20 attached. The operation permission control of the motor 17 will be described below using the flowchart shown in FIG.

That is, in the power tool 10 of the present embodiment, as shown in FIG. 8, first, in step S11, the control unit 16 on the main body 11 side determines whether the preset mode is the "low speed high torque mode". Determine whether or not.
Here, if the "low speed high torque mode" is set, the process advances to step S12, and if it is not set, the process advances to step S16.

Note that the "low speed high torque mode" determined here is one of the modes set in the control unit 16 in advance.
As shown in FIG. 11, the control unit 16 has two modes: a "high speed low torque mode" in which the motor is controlled to output low torque at a high rotation speed, and a high torque mode that outputs high torque at a lower rotation speed than the high speed low torque mode. A "low speed high torque mode" is set to control the motor to

Furthermore, as shown in FIG. 11, the control unit 16 determines whether the "high-speed low-torque mode" is a control number or a control number depending on the range of gripping values that permit the operation of the motor 17. It is subdivided into 5 stages from H1 to H5. Similarly, in the "low speed high torque mode", the control No. It is subdivided into three stages, L1 to L3.
The "low speed high torque mode" determined in step S11 is a mode in which the rotational speed applied by the motor 17 is relatively low, but high torque is applied, and the work requires more torque than rotational speed. selected at times. In this "low-speed high-torque mode," a higher torque is output than in other modes, so the user needs to work while holding the power tool 10 firmly. Therefore, in step S11, it is first determined whether or not the mode is the "low speed high torque mode".

Next, in step S12, since it was determined in step S11 that the mode is "low speed high torque mode", the control unit 16 calls a pre-registered low speed high torque control number from a storage unit such as a memory (not shown).
Next, in step S13, it is determined whether or not the auxiliary handle 20 is attached to the main body 11. Here, if the auxiliary handle 20 is attached to the main body 11, the process advances to step S14. On the other hand, if the auxiliary handle 20 is not attached, it is determined that the conditions for performing work in the "low speed high torque mode" are not satisfied, and the process proceeds to step S18, where the operation of the motor 17 is prohibited and processing is performed. end.

Thereby, work in the "low-speed high-torque mode" can be reliably performed with the auxiliary handle 20 attached to the main body 11, thereby improving safety.
Here, the presence or absence of the auxiliary handle 20 may be determined by determining whether or not the signal receiving unit 19 on the main body 11 side communicates with the signal transmitting unit 26 on the auxiliary handle 20 side. Alternatively, the presence or absence of the auxiliary handle 20 may be determined using a sensor or the like that detects whether the auxiliary handle 20 is attached.

Next, in step S14, the value of the grip detection signal (grip value) detected by the pressure sensor 25 on the auxiliary handle 20 side is within the range of the operation permission grip value corresponding to the control number called in step S12. Determine whether or not.
Here, if the gripping value is within the range of operation permission gripping values, it is determined that the conditions for performing the work in the "low speed high torque mode" are satisfied, and the process proceeds to step S15, in which the motor 17 is operated. Allow and end the process.

On the other hand, if the grip value is smaller than the range of operation permission grip values, it is determined that the conditions for performing the work in the "low speed high torque mode" are not satisfied, and the process proceeds to step S16.
Next, in step S16, it is determined in step S11 that the mode is not "low speed high torque mode," or in step S14 it is determined that the grip value is smaller than the range of operation permission grip values, so "low speed high torque mode" is determined. Call the control number of the ``high-speed low-torque mode,'' which has less usage conditions than the ``torque mode''.

Next, in step S17, it is determined whether the grip value is within the range of the operation permission grip value corresponding to the control No. of the "high speed low torque mode" called out in step S16.
Here, if the gripping value is within the range of operation permission gripping values, it is determined that the conditions for implementing the work in the "high speed low torque mode" are satisfied, and the process proceeds to step S15, in which the motor 17 is operated. Allow and end the process.

On the other hand, if the gripping value is smaller than the range of operation permission gripping values, it is determined that the conditions for performing work in the "high speed low torque mode" are not satisfied, and the process proceeds to step S18, where the operation of the motor 17 is stopped. Prohibit and end the process.
As described above, the power tool 10 of the present embodiment detects gripping of the auxiliary handle 20 during work such as "low speed high torque mode" which requires highly safe work using the auxiliary handle 20, , determines whether the magnitude of the gripping force (grip value) is within the range according to the set mode, and allows the operation of the motor 17 only when it is within the range, so that the auxiliary handle 20 Work can be performed with higher safety using the power tool 10 with the attached power tool 10.

<Setting control of operation permission threshold according to the work level estimated according to the voltage of the power supply unit 18b that decreased during work>
In the power tool 10 of this embodiment, following the process shown in FIG. 8, control is performed to calculate the voltage value of the power supply unit 18b that has decreased during work, and to set an operation permission threshold according to the calculated voltage value. be done. The operation permission control of the motor 17 will be described below using the flowchart shown in FIG.

That is, in step S21, the voltage detection section 18ba of the power supply section 18b on the main body section 11 side detects the initial voltage value _V0 of the power supply section 18b at the time (before) of starting work.
Next, in step S22, the voltage detection section 18ba of the power supply section 18b detects the voltage value V1 of the power supply section 18b during work.
Next, in step S23, the initial voltage value V ₀ of the power supply unit 18b at the time of starting (before) the work detected in step S21, the voltage value _V1 of the power supply unit 18b during work detected in step S22, The voltage value V (=V ₀ -V ₁ ) that decreased during the work is calculated by comparing the values.

Next, in step S24, the control unit 16 acquires the currently set work mode (control No. H3).
Here, as described above, the control unit 16 has two working modes, a high speed low torque mode and a low speed high torque mode, as shown in FIG. An appropriate work mode is automatically set depending on the descent, etc.

As shown in FIG. 11, the "high-speed low-torque mode" is controlled by the control No. It is subdivided into 5 stages from H1 to H5. Similarly, in the "low speed high torque mode", the control No. It is subdivided into three stages, L1 to L3.
Note that the acquisition of the current control number in step S24 may be performed before steps S21 to S23.

Next, in step S25, it is determined whether or not the voltage value V of the power supply unit 18b, which has decreased during the work calculated in step S23, exceeds a preset voltage threshold within a predetermined time (for example, 5 minutes). judge.
Here, if the voltage value V of the power supply unit 18b, which has decreased during the work, exceeds the voltage threshold within 5 minutes, the process proceeds to step S26, and if it does not exceed the voltage threshold, the process proceeds to step S27. .

Next, in step S26, it is determined in step S25 that the voltage value V of the power supply unit 18b, which decreased during the work calculated in step S23, exceeded the voltage threshold within 5 minutes (see the solid line in FIG. 10). Therefore, the control unit 16 estimates that the decreased voltage value is large due to the low skill level of the user, and selects the work No. corresponding to the user with a low skill level. Change to H2 and set.

The work No. set here. H2 is the work No. before being changed. As shown in FIG. 11, the operation permission range of the grip value (21 to 25 kg) is set to a larger value range than the operation permission range of the grip value of H3 (16 to 20 kg).
As a result, in step S26, the mode is changed to a mode for users with a low skill level in which the operation is not permitted unless the auxiliary handle 20 is gripped more strongly, so the work is performed in an appropriate work mode according to the skill level of the user. be able to.

On the other hand, in step S27, since it is determined in step S25 that the voltage value V of the power supply unit 18b, which decreased during the work calculated in step S23, has not exceeded the voltage threshold within 5 minutes, It is determined whether or not the voltage threshold has been exceeded during that time.
Here, if the voltage value V of the power supply unit 18b, which has decreased during the work, exceeds the voltage threshold within 5 to 10 minutes, the process proceeds to step S28, and if it does not exceed the voltage threshold, The process advances to step S29.

In step S28, it is determined in step S27 that the voltage value V of the power supply unit 18b, which decreased during the work calculated in step S23, exceeded the voltage threshold within 5 minutes to 10 minutes (see the broken line in FIG. 10). Therefore, the control unit 16 estimates that the skill level of the user is normal, and selects the work No. corresponding to the user with a normal skill level. Leave H3 unchanged.
As a result, in step S28, it is determined that the skill level of the user estimated from the voltage value V of the power supply unit 18b that has decreased during work matches the currently set work mode (control No.), and Keep the mode unchanged. Therefore, work can be performed in an appropriate work mode according to the skill level of the user.

In step S29, in step S27, the voltage value V of the power supply unit 18b that has decreased during the work calculated in step S23 does not exceed the voltage threshold within 5 minutes to 10 minutes (see the dashed line in FIG. 10). Therefore, the control unit 16 estimates that the user's skill level is higher than normal and that the work is being performed without unnecessary voltage drop, and performs the work corresponding to the user with a high skill level. No. Change to H4 and maintain.

The work No. set here. H4 is the work No. before being changed. As shown in FIG. 11, the operation permission range of the grip value (111 to 15 kg) is set to a smaller value range than the operation permission range of the grip value of H3 (16 to 20 kg).
As a result, in step S29, the mode is changed to a mode for users with a high skill level who can grip the auxiliary handle 20 with a weaker gripping force and have no problem, so work can be done in an appropriate work mode according to the user's skill level. can be carried out.

<Setting control of operation permission threshold according to the work level estimated according to the temperature of the power supply unit 18b that rose during work>
The setting control of the work mode (threshold value for stopping the operation of the motor 17) shown in FIG. It may also be carried out using the temperature of section 18b.

Even in this case, there is an empirical rule that the higher the skill level of the user is, the more the temperature rise of the power supply section 18b during work is suppressed, and the lower the user's skill level is, the greater the temperature rise of the power supply section 18b during work. From this point, the same control as above can be performed.
Here, regarding the setting control of the work mode (threshold value for stopping the operation of the motor 17), which is performed using the temperature of the power supply section 18b that has increased during work detected by the temperature sensor 18bb, FIGS. 14 to 15(b) The following is an explanation using .

Specifically, as shown in FIG. 14, first, in step S51, the temperature sensor 18bb of the power supply section 18b on the main body section 11 side detects the temperature _T1 of the power supply section 18b during work.
Next, in step S52, it is determined whether the temperature _T1 of the power supply unit 18b during operation detected in step S51 exceeds a predetermined temperature (for example, 40° C.).
Here, if the detected temperature _T1 exceeds 40°C, the process proceeds to step S54, and if it is below 40°C, the process returns to step S51.

In addition, in step S52, by determining whether the temperature T1 of the power supply unit 18b during operation detected in step S51 exceeds 40°C, it is possible to determine whether the temperature rise is likely to vary depending on the skill of the user at the beginning of use. "Temperature rise after a predetermined period of time" can be used as a determination material.
Next, in step S53, the control unit 16 acquires the currently set work mode (control No. H3). Note that the acquisition of the current control number in step S53 may be performed before steps S51 to S52.

Next, in step S54, first, the flag F2 is turned on, and thereafter, the flag is turned on every 5 seconds to detect the temperature of the power supply section 18b by the temperature sensor 18bb.
Here, the flag that is turned ON every 5 seconds is, for example, flag No. 1, as shown in FIG. 15(b). Starting from F1, F2, F3, F4...n are stored in a storage unit (not shown) along with temperatures detected every 5 seconds.

Next, in step S55, the temperatures recorded in the previous flag and the current flag are compared, and the difference between them (temperature increase) T is set to a preset temperature threshold (for example, 10°C). Determine whether or not it exceeds.
Here, if the temperature T of the power supply unit 18b, which has increased compared to the previous flag (that is, 5 seconds ago), exceeds the temperature threshold (10°C), the process advances to step S56, and the temperature threshold ( 10° C.), the process advances to step S57.

For example, the graph shown in FIG. 15(a) shows the temperature rise of the power supply section 18b when used by a user with a low skill level. In this case, as shown in FIG. 15(b), the temperatures measured every 5 seconds after the temperature of the power supply unit 18b exceeds 40°C are F1: 40°C, F2: 45°C, F3: 49°C. , F4: The temperature rises rapidly to 61°C.
Next, in step S56, the temperature T of the power supply unit 18b, which has increased compared to the previous flag temperature in step S55, exceeds the temperature threshold (10° C.) (see the solid line in FIG. 15(a)). Since it is determined that the user has a low skill level, the control unit 16 estimates that a load is applied to the power supply unit 18b and the temperature of the power supply unit 18b has rapidly increased due to the user's low skill level, and takes measures to deal with the user's low skill level. Work No. Change to H2 and set.

The work No. set here. As mentioned above, H2 is the work No. before being changed. As shown in FIG. 11, the operation permission range of the grip value (21 to 25 kg) is set to a larger value range than the operation permission range of the grip value of H3 (16 to 20 kg).
As a result, in step S56, the mode is changed to a mode for users with a low skill level in which the operation is not permitted unless the auxiliary handle 20 is gripped more strongly, so the work is performed in an appropriate work mode according to the skill level of the user. be able to.

After step S56, in step S60, the flag No. is reset and the process ends.
On the other hand, in step S57, after it is determined in step S55 that the temperature T of the power supply unit 18b, which has increased in comparison with the previous flag temperature, does not exceed the temperature threshold (10° C.), flag No. It is determined whether the temperature exceeds 100 (whether 500 seconds have passed since the temperature exceeded 40° C.).

Here, if the flag No. exceeds 100, it is determined that there is no rapid temperature rise in the power supply unit 18b during the work, and the process proceeds to step S58. If the flag No. does not exceed 100, the flag No. The process proceeds to step S59 so that the flag is kept ON until the temperature reaches 100 or until the temperature increase from the previous flag temperature exceeds 10°C.
In step S58, it is determined in step S55 that the temperature increase of the power supply section 18b during work has not exceeded 10° C., and in step S57, it is determined that the flag No. has exceeded 100 (see the broken line in FIG. 16(a)). Therefore, the control unit 16 estimates that there was no sudden temperature rise during the work because the skill level of the user was higher than normal, and assigned the work number corresponding to the user with a high skill level. Change to H4 and maintain.

For example, the graph shown in FIG. 16(a) shows the temperature rise of the power supply unit 18b when used by a highly skilled user. In this case, as shown in FIG. 16(b), the temperatures measured every 5 seconds after the temperature of the power supply unit 18b exceeds 40°C are F1: 40°C, F2: 41°C, F3: 43°C. , F4: The temperature gradually increases to 45°C.
Comparing the temperature increase graph in Figure 15(a) and the temperature increase graph in Figure 16(a), the curve for a person with a high skill level (Figure 16(a)) shows a temperature increase of 2°C between flags F3 and F4. However, in the curve for those with a low skill level (FIG. 15(a)), a temperature increase of 12° C. was observed.

The work No. set here. As mentioned above, H4 is the work No. before being changed. As shown in FIG. 11, the operation permission range of the grip value (111 to 15 kg) is set to a smaller value range than the operation permission range of the grip value of H3 (16 to 20 kg).
As a result, in step S58, the mode is changed to a mode for users with a high skill level who can grip the auxiliary handle 20 with a weaker gripping force, so that the mode is changed to an appropriate work mode according to the user's skill level. Able to carry out work.

After step S58, in step S60, the flag No. is reset and the process ends.
On the other hand, in step S59, since it was determined in step S55 that the temperature increase of the power supply unit 18b during work did not exceed 10° C., and in step S57 that the flag No. did not exceed 100, the control unit 16 Although no rapid temperature rise of the power supply section 18b was observed during the work, flag No. 18b continued to rise. It is estimated that up to 100 observations are required, and work No. 1 corresponds to a user with an average skill level. The process returns to step S54 while keeping H3 unchanged.

As a result, in step S59, it is determined that the skill level of the user estimated from the temperature T of the power supply unit 18b that rose during the work does not need to be changed from the currently set work mode (control No.). , keeping the working mode unchanged. Therefore, work can be performed in an appropriate work mode according to the skill level of the user.

<Operation permission control of the motor 17 according to the amount of vibration of the power tool 10>
In the power tool 10 of this embodiment, the operation permission control of the motor 17 is performed according to the gripping force for gripping the auxiliary handle 20 described above, and as shown in FIG. However, if the amount of vibration exceeds a predetermined range, control is performed to stop the operation of the motor 17.
Specifically, as shown in FIG. 12, first, in step S31, the control section 16 on the main body section 11 controls the grip section 21 on the auxiliary handle 20 side via the signal transmitting section 26 and the signal receiving section 19. A behavior detection signal detected by the acceleration sensor 28 provided at the end is acquired.
Thereby, the control unit 16 can recognize that the power tool 10 is shaking.

Next, in step S32, as shown in FIG. 1. Second behavior detection threshold), it is determined whether or not the first behavior detection threshold has been exceeded.
Here, if the behavior detection signal exceeds the preset first behavior detection threshold as shown in FIG. 13(a), the process advances to step S33. On the other hand, if the behavior detection signal does not exceed the preset first behavior detection threshold as shown in FIG. 13(b), the process advances to step S27.

Note that, as shown in FIG. 11, the second behavior detection threshold is set for each control number of a preset mode. For example, control No. of high speed low torque mode. In the case of H1 to H5, the second behavior detection threshold is set to 15 m/s ² which is smaller than the first behavior detection threshold (20 m/s ² ). Then, control No. of low speed high torque mode. In the case of L1 to L3, the second behavior detection threshold is set to 12 m/s ² which is smaller than the value of the high speed low torque mode and smaller than the first behavior detection threshold (18 m/s ² ).

Next, in step S33, since it was determined in step S32 that the first behavior detection threshold was exceeded, the control unit 16 determines that the amount of vibration of the power tool 10 is large, and stops the operation of the motor 17 to perform work. to be discontinued.
Next, in step S34, the control unit 16 acquires from the pressure sensor 25 the magnitude of the gripping force (grip value) of the auxiliary handle 20 when the first behavior detection threshold is exceeded (when the amount of shake is large). do.

Next, in step S35, the control unit 16 compares the grip value acquired from the pressure sensor 25 with the range of operation permission grip values in the control table for each control number of the set work mode shown in FIG.
FIG. 11 shows a control table that includes the range of operation permission grip values of the control table for each control number of the set work mode.

For example, control No. of high speed low torque mode. In the case of H1 to H5, the range of the operation permission grip value is set to 26 kg~, 21~25 kg, 16~20 kg, 11~15 kg, and 0~10 kg. Then, control No. of low speed high torque mode. In the case of L1 to L3, the range of the operation permission grip value is set to 26 kg or more, 21 to 25 kg, and 0 to 20 kg.

Next, in step S36, based on the result of the comparison in step S35, the table is updated to a table in which the range of operation permission grip values is changed to a larger range, and the process returns to step S31.
As a result, depending on the skill of the user, if the amount of shaking becomes large even within the range of operation permission grip values according to the control number of each work mode, it is determined that the user's skill is low and the motor is The range of gripping values that permit the operation 17 can be changed to a larger range of values, as shown in FIG. 13(c).

Therefore, by optimizing the range of the operation permission grip value according to the skill of the user, it is possible to ensure the safety of the user and to perform appropriate control taking into account differences in the skill of the users.
Furthermore, in step S37, since it is determined in step S32 that the acquired behavior detection signal does not exceed the first behavior detection threshold, the amount of blurring is considered to be relatively small. Therefore, in step S37, as shown in FIG. 13(b), a second behavior detection threshold smaller than the first behavior detection threshold is set within a predetermined time (for example, 60 seconds), and the acquired behavior detection It is determined whether or not exceeds a second behavior detection threshold.

Note that, as shown in FIG. 11, the second behavior detection threshold is set for each control number of a preset mode. For example, control No. of high speed low torque mode. In the case of H1 to H5, the second behavior detection threshold is set to 15 m/s ² which is smaller than the first behavior detection threshold (20 m/s ² ). Then, control No. of low speed high torque mode. In the case of L1 to L3, the second behavior detection threshold is set to 12 m/s ² which is smaller than the value of the high speed low torque mode and smaller than the first behavior detection threshold (18 m/s ² ).

Here, if the behavior detection signal exceeds the second behavior detection threshold, the process advances to step S38. On the other hand, if the behavior detection signal does not exceed the second behavior detection threshold, it is determined that the power tool 10 is in a good working condition with little vibration, and the operation of the motor 17 is not stopped and step S31 Return to
Next, in step S38, since it was determined in step S37 that the second behavior detection threshold was exceeded, the control unit 16 turns on the processing flag.

Next, in step S39, it is determined whether or not the number of times the value of the detected behavior detection signal exceeds the second behavior detection threshold exceeds a predetermined number of times (for example, 5 times) within a predetermined time (for example, 60 seconds). Determine whether
Here, if the value of the detected behavior detection signal exceeds the predetermined number of times (for example, 5 times) that the value of the detected behavior detection signal exceeds the second behavior detection threshold, the process advances to step S40. On the other hand, if the value of the detected behavior detection signal has not exceeded the predetermined number of times (for example, 5 times) exceeding the second behavior detection threshold, the process advances to step S43.

Next, in step S40, since it was determined in step S39 that the value of the detected behavior detection signal exceeded the predetermined number of times (for example, 5 times) that the value of the detected behavior detection signal exceeded the second behavior detection threshold, the first behavior Although the amount of shake that is large enough to exceed the detection threshold has not occurred, the control unit 16 controls the second The maximum value of the grip force (grip value) of the auxiliary handle 20 during the period in which the behavior detection threshold is exceeded is acquired from the pressure sensor 25.

Next, in step S41, the control unit 16 selects the maximum value of the grip values acquired from the pressure sensor 25 and the range of operation permission grip values in the control table for each control number of the set work mode shown in FIG. Verify.
Next, in step S42, based on the result of the comparison in step S41, the table is updated to a table in which the range of operation permission grip values is changed to a larger range, as shown in FIG. 13(c), and the process returns to step S31.

As a result, depending on the user's skill, if the vibration exceeding the second behavior detection threshold occurs more than a predetermined number of times even if it is within the range of the operation permission grip value according to the control number of each work mode. , it is possible to determine that the user's skill is low and change the grip value range within which the operation of the motor 17 is permitted to be changed to a larger value range.
Therefore, by optimizing the range of the operation permission grip value according to the skill of the user, it is possible to ensure the safety of the user and to perform appropriate control taking into account differences in the skill of the users.

Next, in step S43, since it is determined in step S39 that the value of the detected behavior detection signal has not exceeded the predetermined number of times (for example, 5 times) exceeding the second behavior detection threshold, the power tool 10 It is determined that the number of shakes is small and the working condition is good, and the process proceeds to step S44 without stopping the operation of the motor 17.
Next, in step S44, the processing flag that was turned on in step S38 is turned off, and the process returns to step S31.

In the power tool 10 of the present embodiment, as described above, if the amount of vibration exceeding the first behavior detection threshold occurs during work using the power tool 10 with the auxiliary handle 20, the motor 17 is immediately activated. As shown in FIG. 13(c), the magnitude of the force for gripping the grip portion 21 of the auxiliary handle 20, which is set to stop the operation and allow the operation, is set to a larger value (operation permission grip value). Change to

As a result, if the amount of shake that exceeds the first behavior detection threshold occurs, the drive of the motor 17 is stopped to ensure safety, and the operation of the motor 17 is allowed unless the grip is applied with a stronger force. You can rewrite the table so that it does not occur.
Furthermore, if the amount of vibration that does not exceed the first behavior detection threshold but exceeds the second behavior detection threshold occurs and occurs a predetermined number of times within a predetermined time, the drive of the motor 17 is stopped. In addition to ensuring safety, the table can be rewritten so that the motor 17 is not allowed to operate unless it is gripped with a stronger force.

On the other hand, if the detected behavior detection signal does not exceed the first behavior detection threshold, or if the amount of vibration that does not exceed the first behavior detection threshold but exceeds the second behavior detection threshold occurs and within a predetermined time If the number of shakes does not exceed a predetermined number, it is determined that the power tool 10 has a small number of shakes and is in good working condition, and the motor 17 can continue to work without stopping its operation. can.

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention.
(A)
In the above embodiment, an example is given in which the voltage detection unit 18ba that detects the voltage of the power supply unit 18b that decreases during work and the temperature sensor 18bb that detects the temperature of the power supply unit 18b that increases during work are provided. I explained. However, the present invention is not limited thereto.

For example, the present invention can be applied to a power tool that is provided with either a voltage detection section that detects the voltage of the power supply section that drops during work, or a temperature sensor that detects the temperature of the power supply section that rises during work. may be applied.
For example, if the power supply unit is provided with a power supply control unit, the setting control of the work mode (threshold value for stopping the operation of the motor 17) shown in FIG. In addition to using the temperature of the power supply unit that rises during work, the control command may be used to send a control command from the power supply control unit to the control unit in response to a voltage drop.
Even in this case, it is possible to indirectly recognize the voltage of the power supply unit that has decreased during work, so that the same effect as described above can be achieved.

(B)
In the embodiment described above, an example has been described in which the present invention is applied to the power tool 10 in which the auxiliary handle 20 is attached to the main body portion 11. However, the present invention is not limited thereto.
For example, the present invention may be applied to a power tool (work tool) that has only a main body without an auxiliary handle.

(C)
In the above embodiment, as shown in FIG. 11, an example is given in which the operation permission threshold and the operation permission grip value range are set for each control number of each work mode (high speed, low torque, low speed, high torque). did. However, the present invention is not limited thereto.

For example, the range of the operation permission threshold and operation permission grip value set for each control number of each work mode (high speed low torque, low speed high torque) is not limited to the values shown in FIG. It may be appropriately set to a larger value or a smaller value depending on the content.
Similarly, the first and second behavior detection thresholds set for each control number of each work mode (high speed low torque, low speed high torque) are not limited to the values shown in FIG. , may be appropriately set to a larger value or a smaller value depending on the content of the work.

(D)
In the above embodiment, an example has been described in which the acceleration sensor 28 that detects the behavior of the power tool 10 during operation is provided on the auxiliary handle 20 side. However, the present invention is not limited thereto.
For example, a configuration may be adopted in which a behavior detection section such as an acceleration sensor is provided on the main body side.

Even in this case, the same effect as described above can be obtained by the behavior detecting section provided on the main body side detecting the behavior (shake amount) of the electric tool (work tool) during work.
Further, the behavior detection section such as an acceleration sensor may be provided on the main body side and the auxiliary handle side.
Note that even if the behavior detecting section such as an acceleration sensor is provided on the main body side, it is preferable that the behavior detecting section is disposed as close to the end as possible. This makes it easier to detect the amount of shake that has occurred in the main body, compared to a configuration in which the behavior detection section is provided near the center of the main body.

(E)
In the above embodiment, an example has been described in which the transmission and reception of signals between the main body part 11 and the auxiliary handle 20 is carried out by non-contact communication. However, the present invention is not limited thereto.
For example, the communication between the main body and the auxiliary handle may be such that signals are transmitted and received in a state of contact.

(F)
In the embodiment described above, an example has been described in which the acceleration sensor 28 is used as the behavior detection section that detects the behavior of the power tool 10 during operation. However, the present invention is not limited thereto.
For example, other sensors such as a gyro sensor may be used instead of the acceleration sensor.

(G)
In the above embodiment, the electric tool 10 in which the motor 17 is driven by electric power supplied from the power supply section 18b provided in the main body section 11 has been described as an example. However, the present invention is not limited thereto.
For example, it may be a power tool in which power is supplied to a motor via a power cable to drive the motor.
In this case, other information such as the temperature of the power cable may be used as the information on the power supply unit.

(H)
In the above embodiment, the power tool 10 is described as an example in which the main handle 13 is held by the user's right hand and the auxiliary handle 20 is held by the left hand. However, the present invention is not limited thereto.
For example, the power tool may be equipped with an auxiliary handle such that the user's left hand holds the main handle and the user's right hand holds the auxiliary handle.

(I)
In the above embodiment, an example in which a trigger switch that adjusts the output torque of the motor 17 according to the amount of pull (operation amount) is used as the operation unit for driving the motor 17 of the power tool 10 is used. I listed and explained. However, the present invention is not limited thereto.
For example, other switches such as an ON/OFF switch may be used instead of the trigger switch.

(J)
In the above embodiment, the present invention has been described as an example in which the present invention is applied to a power tool 10 such as an electric screwdriver as a power tool according to the present invention. However, the present invention is not limited thereto.
For example, in addition to electric screwdrivers, the present invention may be applied to power tools for performing various operations such as grinders, jigsaws, chainsaws, and the like.

(K)
In the embodiment described above, the information of the power supply unit 18b includes a change in the voltage from the initial voltage of the power supply unit 18b before the start of work to a drop during the work, or an increase in the temperature of the power supply unit 18b during work detected by the temperature sensor 18bb. The explanation was given using an example in which . However, the present invention is not limited thereto.

For example, as information about the power supply unit, other information that is effective for estimating the skill level of the user (for example, the content of control by the power supply control unit provided in the power supply unit (for example, control commands in response to voltage drop), etc. ) may be detected and the motor may be controlled.

(L)
In the embodiment described above, an example has been described in which the present invention is applied to a power tool 10 that includes an auxiliary handle 20 that is detachably attached to the main body portion 11. However, the present invention is not limited thereto.
For example, the present invention may be applied to a power tool (work tool) that includes an auxiliary handle that is non-removably fixed to the main body.

The power tool of the present invention has the effect of being able to perform highly safe and appropriate control according to differences in the skill of the user, and is therefore widely applicable to various power tools driven by motors. .

10 Power tools (work tools)
11 Main body part 12 Rotating part 13 Main handle 14 Operating part 15 Connected part 15a Cylindrical part 15aa First recess 15ab Second recess 15b Attachment/detachment button 15c Insertion hole 16 Control part 17 Motor 18a Non-contact power supply part 18b Power supply part 18ba Voltage detection part (Power information detection section)
18bb Temperature sensor (power information detection section)
19 Signal receiving section 20 Auxiliary handle 21 Gripping section 22 Connection section 22a Insertion shaft 23 Cylindrical section 23aa First convex section 23ab Second convex section 24 Non-contact power receiving section 25 Pressure sensor (grip detection section)
25a, 25b Pressure sensor (grip detection part)
26 Signal transmission section 27 Grip detection signal processing section 28 Acceleration sensor (behavior detection section)
30 Tip tool 56 Lock release button 56a Insertion hole 56b Elastic member 56c Locked part 62a Insertion shaft 62b Locking part

Claims (19)

A work tool that performs a predetermined work by driving an attached tip tool,
The main body and
a power supply section that is provided in the main body section and supplies electric power;
a motor that is provided in the main body and receives power from the power source to drive the tip tool;
a power supply information detection unit that is provided in the main body and detects information of the power supply unit before and during work;
a control section that is provided in the main body section and controls the operation of the motor according to the skill level of the user estimated based on the information of the power supply section detected by the power supply information detection section;
A work tool equipped with. The control unit selects a threshold value set for stopping operation of the motor according to a skill level of the user estimated based on information from the power supply unit.
The working tool according to claim 1. The control section has a plurality of working modes including the threshold value set for stopping the operation of the motor, and the control section has a plurality of working modes including the threshold value set for stopping the operation of the motor, and operates according to the skill level of the user estimated based on the information of the power supply section. , determining whether to change from the currently set first work mode to the second work mode;
The working tool according to claim 2. The control unit changes the work mode in accordance with the estimated skill level of the user when the information of the power supply unit exceeds a predetermined threshold by a first time threshold.
The working tool according to claim 3. The control unit maintains the work mode if the information of the power supply unit exceeds a predetermined threshold by a second time threshold that is longer than the first time threshold.
The working tool according to claim 4. If the information from the power supply unit does not exceed a predetermined threshold by a second time threshold that is longer than the first time threshold, the control unit controls the work according to the estimated skill level of the user. change mode,
The working tool according to claim 4. The information on the power supply section includes changes in voltage from the voltage immediately before work, control details of a power supply control section that controls the power supply section, and temperature changes in the power supply section.
A working tool according to any one of claims 1 to 6. an auxiliary handle attached to the main body and gripped by the user during work; a grip detection unit that detects the grip force with which the user grips the auxiliary handle; further comprising an auxiliary handle having a transmitting section that transmits the detection result to the main body section;
A working tool according to any one of claims 1 to 7. further comprising a receiving section that is provided in the main body section and receives the detection result of the grip detection section transmitted from the transmitting section,
The control unit determines whether to stop the operation of the motor according to the detection result of the grip detection unit.
The working tool according to claim 8. further comprising a non-contact power supply unit that is provided on the main body and supplies power to the auxiliary handle in a non-contact manner;
The auxiliary handle includes a non-contact power receiving section that receives power supplied from the non-contact power feeding section.
The working tool according to claim 8 or 9. further comprising a behavior detection unit that detects behavior of the main body,
A working tool according to any one of claims 1 to 10. The control unit determines whether or not to permit operation of the motor based on a detection result of the behavior by the behavior detection unit.
The working tool according to claim 11. Regarding the detection result of the behavior detection unit, the control unit sets a first threshold value that stops the operation of the motor if exceeded even once, and a first threshold value that stops the operation of the motor if the result is smaller than the first threshold value and exceeds a predetermined number of times within a predetermined time. a second threshold value for stopping the operation;
The working tool according to claim 11 or 12. The control unit controls the motor in a high speed low torque mode to output low torque at a high rotation speed and in a high speed low torque mode to output higher torque at a lower rotation speed than in the high speed low torque mode. Has low speed high torque mode,
A working tool according to any one of claims 11 to 13. In the low-speed high-torque mode, the control unit sets a threshold value smaller than the threshold value set in the high-speed low-torque mode and for stopping the operation of the motor for the detection result detected by the behavior detection unit.
The working tool according to claim 14. further comprising an auxiliary handle having a grip detection section that detects the grip force gripped by the user;
In at least one of the high-speed low-torque mode and the low-speed high-torque mode, the gripping force threshold set for the detection result in the gripping detection unit is set in multiple stages.
A working tool according to claim 14 or 15. The behavior detection section is provided on the auxiliary handle,
The working tool according to claim 16. The behavior detection unit is provided near an end of the auxiliary handle opposite to a connection portion with the main body.
The working tool according to claim 17. The behavior detection unit is an acceleration sensor,
A working tool according to any one of claims 11 to 18.

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