JP2019209394A - Power tool - Google Patents

Abstract

To provide a power tool capable of surely determining or notifying permission of driving of a motor.SOLUTION: A power tool 1A comprises a motor 5, a tip tool driven by driving force of the motor 5, a first control part 21 for controlling driving of the motor 5 and a second control part 31 for determining permission of the driving of the motor 5. A first control part 21 is provided on a first control board 20, and a second control part 31 is provided on a second control board 31, and the first control board 20 and the second control board 30 are mutually a separate body. The second control part 31 determines permission of driving of the motor 5 by a state of an off-lock button switch 14, a presence sensor 15 and a trigger switch 12. The second control part 31 notifies by an LED 19 when the off-lock button switch 14 is turned on.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power tool such as a hedge trimmer.

  In a hedge trimmer as shown in Patent Document 1 described below, a design is known in which an off-lock button is provided and the trigger is not operated unless the off-lock button is pressed (the motor does not drive). It is also known that a grip sensor (presence sensor) is provided in the handle portion and that the handle portion is gripped as one of the conditions for starting operation (starting motor driving).

JP 2014-136297 A

  For example, when the operation can be started by operating the trigger by grasping the handle portion within a predetermined time after the off-lock button is pressed, the predetermined time is used by the user in order to prevent an unexpected operation. It is conceivable to notify the user by lighting the LED. In this case, it is desirable to avoid as much as possible the situation in which the notification is not performed even though the operation can be started.

  Further, in the configuration provided with the grip sensor, when it takes a time close to the predetermined time from pressing the off-lock button to gripping the handle portion, the predetermined time elapses when the trigger is operated after that, and again It is necessary to press an off-lock button, and workability is deteriorated.

  The present invention has been made in view of such a situation, and a first object of the present invention is to provide an electric tool capable of reliably determining whether or not to permit driving of a motor.

  A second object of the present invention is to provide an electric tool capable of improving workability.

The first aspect of the present invention is a power tool. This electric tool
A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
A second control unit that determines whether or not the motor is permitted to be driven.

The first control unit is provided on a first control board;
The second control unit is provided on a second control board;
The first and second control boards may be separate from each other.

A gripper to be gripped by an operator;
A detection unit for detecting that the grip unit is gripped by an operator;
A first switch for an operator to switch between driving and stopping the motor;
A second switch for an operator to switch permission / inhibition of driving of the motor,
The conditions for allowing the second control unit to drive the motor include that the second switch is allowed to perform an operation, and that the gripping unit is gripped by an operator.
The first control unit may control driving of the motor in accordance with an operation of the first switch on condition that the driving of the motor is permitted by the second control unit.

  You may provide the state alerting | reporting part which alert | reports that the predetermined condition which is one of the drive permission conditions of the said motor is satisfy | filled by control of a said 2nd control part.

The second aspect of the present invention is a power tool. This electric tool
A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
A state notification unit that notifies that a predetermined condition, which is one of the drive permission conditions for the motor, is satisfied without being controlled by the first control unit.

  The notification that the predetermined condition is satisfied by the state notification unit may be stopped when a predetermined time has elapsed from the start of the notification.

A third aspect of the present invention is a power tool. This electric tool
A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
A gripper to be gripped by an operator;
A detection unit for detecting that the grip unit is gripped by an operator;
A first switch for an operator to switch between driving and stopping the motor;
A second switch for an operator to switch permission / inhibition of driving of the motor,
The conditions for permitting driving of the motor include that the second switch is allowed to perform an operation, and that the grip portion is gripped by an operator.
When the first predetermined time elapses without the gripper being gripped by an operator after the permission operation is performed on the second switch, the driving of the motor is permitted even if the gripper is gripped by the worker thereafter. Without
When the gripping part is gripped by an operator before the first predetermined time elapses after the permission operation is performed on the second switch, the driving of the motor is permitted beyond the first predetermined time.

  When the gripping part is gripped by an operator before the first predetermined time elapses after the permission operation is performed on the second switch, the driving of the motor is permitted for the second predetermined time after the gripping. Also good.

  The first switch may be operable regardless of the state of the second switch.

A second control unit that determines whether or not the motor is permitted to drive;
The first control unit may control driving of the motor in accordance with an operation of the first switch on condition that the driving of the motor is permitted by the second control unit.

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

  According to the first aspect of the present invention, it is possible to provide an electric tool that can reliably determine whether or not to permit driving of a motor.

  According to the second aspect of the present invention, it is possible to provide an electric tool capable of reliably reporting whether or not the motor is permitted to be driven.

  According to the 3rd aspect of this invention, the electric tool which can improve workability | operativity can be provided.

1 is a side sectional view of a power tool 1A according to Embodiment 1 of the present invention. The schematic block diagram of 1 A of electric tools. The control flowchart of 1 A of electric tools. The sectional side view of the electric tool 1B which concerns on Embodiment 2 of this invention. The expanded upper sectional view of the vicinity of the off-lock button 13 of the electric tool 1B.

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

(Embodiment 1)
FIG. 1 is a side sectional view of an electric tool 1A according to Embodiment 1 of the present invention. With reference to FIG. 1, the front-rear and vertical directions that are orthogonal to each other are defined. The electric tool 1A is a hedge trimmer (a mower). 1 A of electric tools are cordless types, and operate | move with the electric power supplied from the battery pack 10 with which the rear-end part of the main body 2 was attached so that attachment or detachment was possible.

  The electric tool 1 </ b> A includes, for example, a resin housing 3, a motor 5 serving as a drive source, and a cam mechanism 6 driven by the motor 5. The drive shafts of the motor 5 and the cam mechanism 6 are both parallel to the vertical direction. The upper blade 7 and the lower blade 8 as the tip tools are engaged with the cam mechanism 6 and extend forward from the lower end portion of the housing 3. The cam mechanism 6 is a reciprocating motion conversion mechanism that converts the rotation of the motor 5 into the reciprocating motion of the upper blade 7 and the lower blade 8. Since the configuration and operation from the rotation of the motor 5 to the reciprocating motion of the upper blade 7 and the lower blade 8 are well known, further detailed description is omitted.

  The housing 3 includes a motor housing portion 3a for housing the motor 5, and a handle portion (gripping portion) 3b extending rearward from the upper end portion of the motor housing portion 3a. Although not shown, the handle portion 3b may be a main handle (rear handle), and a sub handle (front handle) may be provided in the housing 3. The handle 3b is provided with a trigger 11, a trigger switch 12, an off-lock button 13, and a presence sensor (gripping sensor) 15.

  The trigger 11 is an operation unit for the operator to switch between driving and stopping of the motor 5. The trigger switch 12 as the first switch is a switch that is turned on and off (operated by the operator via the trigger 11) according to the operation of the trigger 11. The trigger 11 can be operated regardless of whether or not the off-lock button 13 is pressed (not mechanically locked). Pulling the trigger 11 (driving operation) is one of the conditions for permitting driving of the motor 5. The off-lock button 13 is a button for the operator to manually switch whether the motor 5 is driven or not. Pushing the off-lock button 13 (permitting operation) is one of the conditions for permitting driving of the motor 5. The presence sensor 15 is a sensor for detecting that the operator has grasped the handle portion 3b, and whether or not the operator is operating the presence sensor 15 (the operator places his hand close to the presence sensor 15). Depending on whether or not) a signal having a different level is transmitted to a second control unit 31 (FIG. 2) described later. It is one of the conditions for permitting driving of the motor 5 that the operator holds the handle portion 3b (operating the presence sensor 15).

  A first control board 20 and a second control board 30 are provided in the housing 3. The first control board 20 is a control board for controlling the driving of the motor 5 and is provided at the rear end of the housing 3. The second control board 30 is a board for determining whether or not the motor 5 is allowed to be driven, and is provided behind the cam mechanism 6. On the front upper surface of the housing 3, an LED (light emitting diode) 19 as a state notification unit is provided.

  FIG. 2 is a schematic block diagram of the electric tool 1A. A battery pack 10 that supplies power to the main body 2 contains a predetermined number of battery cells 10a. In the main body 2, the first control board 20 is provided with a first control unit 21 including a microcomputer (microcontroller) for controlling the driving of the motor 5. The second control board 30 is provided with a second control unit 31 including a microcomputer for determining whether the motor 5 is allowed to drive and controlling the lighting of the LED 19.

  The off-lock button switch 14 as the second switch is a switch that is switched on and off (operated by the operator via the off-lock button 13) according to the operation of the off-lock button 13 shown in FIG. The trigger switch 12, the off-lock button switch 14, and the presence sensor 15 are connected to the second control board 30 (second control unit 31). The trigger switch 12 is also connected to the first control board 20 (first control unit 21).

  FIG. 3 is a control flowchart of the power tool 1A. When the power is turned on, the second control unit 31 determines whether to release the off-lock by turning on / off the off-lock button switch 14 (S1). When the second control unit 31 detects that the off-lock button switch 14 is turned on (Yes in S1), the second control unit 31 releases the off-lock, so that the motor 5 is driven when the trigger 11 is pulled by grasping the handle unit 3b. (S3) is notified to the operator by the LED 19 (S3).

  The second control unit 31 operates the presence sensor 15 before the first predetermined time of 5 seconds elapses after the off-lock release (turn-off of the off-lock button switch 14) (No in S5) (Yes in S7). If the trigger switch 12 is turned on (S9: Yes) before the second predetermined time of 5 seconds has elapsed since the operation of the presence sensor 15 (No in S8), the first controller 21 is permitted to drive the motor 5 The 1st control part 21 which transmitted the signal and received the drive permission signal drives motor 5 according to ON / OFF of trigger switch 12 (operation of trigger 11) (S11). The second control unit 31 stops off-lock release notification (S13). The first and second predetermined times are not limited to 5 seconds, and may be any length of time, or may be different times.

  When the trigger switch 12 is on (Yes in S15), the second control unit 31 stops releasing the off-lock when the hand is released from the presence sensor 15 (the handle 3b is no longer gripped) (No in S17). Then, the motor 5 drive non-permission signal is transmitted to the first control unit 21, and the first control unit 21 that has received the drive non-permission signal stops the motor 5 (S19). The 2nd control part 31 alert | reports an error to an operator by LED19 (S21). The second control unit 31 changes the lighting mode of the LED 19 between the notification of releasing the off-lock and the error notification (for example, one notification is continuously lit and the other notification is intermittently lit (flashing)). In this case, the notification is made to the operator by distinguishing between the notifications.

  The second control unit 31 continues the error notification unless the trigger switch 12 is turned off (Yes in S23) (S21). When the trigger switch 12 is turned off (No in S23), the second control unit 31 stops error notification (S25). If the hand is separated from the presence sensor 15 (if the handle portion 3b is not gripped) (No in S27), the second control unit 31 returns to step S1.

  When the second control unit 31 does not detect the turn-on of the off-lock button switch 14 in step S1 (No in S1), the second control unit 31 stops the off-lock release notification or maintains the off-lock release notification stopped state (S31). ). If the trigger switch 12 is off (No in S33), the second control unit 31 returns to Step S1. When the trigger switch 12 is on (Yes in S33), the second control unit 31 notifies the operator of an error via the LED 19 (S35). The second control unit 31 continues the error notification unless the trigger switch 12 is turned off (Yes in S37) (S35). When the trigger switch 12 is turned off (No in S37), the second control unit 31 stops error notification (S39). If the hand is separated from the presence sensor 15 (if the handle portion 3b is not gripped) (No in S41), the second control unit 31 returns to step S1.

  In step S5, the second control unit 31 proceeds to step 31 when the presence sensor 15 is not operated (the handle unit 3b is not gripped) and 5 seconds have elapsed (Yes in S5). In step S8, the second control unit 31 proceeds to step 31 when 5 seconds have elapsed without the trigger switch 12 being turned on (Yes in S8). If the presence sensor 15 is not operated in step S7 (the handle 3b is not gripped) (No in S7) and the trigger switch 12 is turned on (Yes in S33), the second control unit 31 causes the LED 19 to give an error to the operator. (S35). At this time, the notification of the off-lock release is stopped. When the turn-off of the trigger switch 12 is detected in step S15 (No in S15), the second control unit 31 stops the off-lock release (becomes an off-lock state), and the first control unit 21 stops the motor 5. (S29). Control returns to step S1. However, the off-lock release may not be stopped immediately after the motor 5 is stopped (S29), but the off-lock may be released after 5 seconds have elapsed after the motor 5 is stopped. In this case, if the presence sensor 15 is operated before the motor 5 is stopped and 5 seconds elapses, the trigger switch 12 is turned on to drive the motor 5, and the presence switch 15 is not turned on. If it is turned on, an error notification is made.

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

(1) Since the second control unit 31 different from the first control unit 21 that controls the driving of the motor 5 determines whether or not the motor 5 is allowed to be driven, the first control unit 21 also determines whether or not the motor 5 is allowed to be driven. Compared to the case, the certainty of determination can be easily increased at low cost. Here, it is difficult to increase the certainty of the determination with the configuration in which the driving of the motor 5 and the determination of whether or not to permit the driving are both performed by a single control unit. By separating the control unit from the determination of permission or rejection, the certainty of the determination can be easily increased at a low cost.

(2) The LED 19 is notified of the off-lock release by the control of the second control unit 31 (regardless of the control of the first control unit 21), and therefore is controlled by the control of the first control unit 21 that controls the driving of the motor 5. Compared with the case where the notification of the unlocking is performed, the certainty of the notification can be easily increased at a low cost. For this reason, it is possible to suppress the risk that notification is not performed despite the off-lock release state (the state in which the motor 5 is driven if the handle 11 is gripped and the trigger 11 is pulled (operated)).

(3) To provide the first control unit 21 for controlling the driving of the motor 5 and the second control unit 31 for determining whether the driving of the motor 5 is permitted or not on the first control board 20 and the second control board 30 which are separate from each other, Compared with the case of providing on a single control board, the area per board can be reduced, the degree of freedom of layout increases, and the increase in the size of the housing 3 can be suppressed by the effective use of dead space.

(4) When the handle portion 3b is gripped after the off-lock button 13 is pressed (when the presence sensor 15 is operated), the second control unit 31 is off-locked for a first predetermined time (5 seconds). In order to maintain the release state, when a time close to the first predetermined time (5 seconds) is required from when the operator presses the off-lock button 13 until the handle part 3b is gripped (until the presence sensor 15 is operated), It is possible to suppress the operator from having to press the off-lock button 13 again, and the workability is improved.

(5) Since the trigger 11 is not mechanically locked regardless of whether or not the off-lock button 13 is pressed (the trigger 11 can be operated), the configuration relating to the mechanical lock of the trigger 11 is unnecessary. The configuration becomes simple.

  In the present embodiment, the second control unit 31 turns on the off-lock button switch 14 (permit operation of the off-lock button 13), approaches the hand to the presence sensor 15 (gripping the handle unit 3b), and a trigger switch. The example which permits the drive of the motor 5 to the 1st control part 21 when three conditions of 12 turn-on (drive operation of the trigger 11) is satisfy | filled was demonstrated. As another example, when the two conditions of turn-on of the off-lock button switch 14 and proximity of the hand to the presence sensor 15 are satisfied, the first control unit 21 is allowed to drive the motor 5 and received permission. The first controller 21 may drive the motor 5 in conjunction with the turn-on of the trigger switch 12.

(Embodiment 2)
FIG. 4 is a side sectional view of an electric tool 1B according to Embodiment 2 of the present invention. FIG. 5 is an enlarged top sectional view of the vicinity of the off-lock button 13 of the electric tool 1B. In the present embodiment, grip detection of the handle portion 3 b is performed by the presence sensor lever (grip detection lever) 16 and the presence sensor switch 17. The presence sensor lever 16 is provided so as to swing downward when an operator grasps the handle portion 3b. The presence sensor switch 17 is a switch that is turned on and off (operated by the operator via the presence sensor lever 16) by operating the presence sensor lever 16 (the presence sensor lever 16 swinging downward). Whether the handle portion 3b is gripped can be detected by turning on / off the presence sensor switch 17. Other points of the present embodiment are the same as those of the first embodiment. The present embodiment can achieve the same effects as those of the first embodiment.

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

  The power tool of the present invention is not limited to the cordless type, and may be a corded type that operates with power supplied from an external AC power source. The power tool of the present invention is not limited to the hedge trimmer, and may be another type of power tool such as a chain saw.

1A, 1B Electric tool, 2 body, 3 housing, 3a motor housing part, 3b handle part (gripping part), 5 motor, 6 cam mechanism (reciprocating motion conversion mechanism), 7 upper blade, 8 lower blade, 10 battery pack, DESCRIPTION OF SYMBOLS 11 Trigger (operation part), 12 Trigger switch (1st switch), 13 Off lock button, 14 Off lock button switch (2nd switch), 15 Presence sensor (grip sensor), 16 Presence sensor lever (grip detection lever), 17 Presence sensor switch, 19 LED (status notification part), 20 1st control board, 21 1st control part (motor control part), 30 2nd control board, 31 2nd control part

Claims (10)

A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
And a second control unit that determines whether or not the motor is permitted to be driven. The first control unit is provided on a first control board;
The second control unit is provided on a second control board;
The power tool according to claim 1, wherein the first and second control boards are separate from each other. A gripper to be gripped by an operator;
A detection unit for detecting that the grip unit is gripped by an operator;
A first switch for an operator to switch between driving and stopping the motor;
A second switch for an operator to switch permission / inhibition of driving of the motor,
The conditions for allowing the second control unit to drive the motor include that the second switch is allowed to perform an operation, and that the gripping unit is gripped by an operator.
The said 1st control part controls the drive of the said motor according to operation of a said 1st switch on the condition that the drive of the said motor is permitted by the said 2nd control part. The electric tool described.   4. The electric motor according to claim 1, further comprising a state notification unit that notifies that a predetermined condition that is one of the drive permission conditions of the motor is satisfied by the control of the second control unit. 5. tool. A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
An electric power tool comprising: a state notification unit that notifies that a predetermined condition that is one of the drive permission conditions of the motor is satisfied, without being controlled by the first control unit.   The power tool according to claim 4 or 5, wherein the notification that the predetermined condition is satisfied by the state notification unit is stopped when a predetermined time has elapsed from the start of the notification. A motor,
A tip tool driven by the driving force of the motor;
A first control unit that controls driving of the motor;
A gripper to be gripped by an operator;
A detection unit for detecting that the grip unit is gripped by an operator;
A first switch for an operator to switch between driving and stopping the motor;
A second switch for an operator to switch permission / inhibition of driving of the motor,
The conditions for permitting driving of the motor include that the second switch is allowed to perform an operation, and that the grip portion is gripped by an operator.
When the first predetermined time elapses without the gripper being gripped by an operator after the permission operation is performed on the second switch, the driving of the motor is permitted even if the gripper is gripped by the worker thereafter. Without
When the gripping part is gripped by an operator before the first predetermined time elapses after the permission operation is performed on the second switch, the motor is permitted to drive the motor beyond the first predetermined time. tool.   When the gripping part is gripped by an operator before the first predetermined time has elapsed since the permission operation has been performed on the second switch, the motor is allowed to drive for a second predetermined time after the gripping. The power tool according to claim 7.   The power tool according to claim 7 or 8, wherein the first switch can be operated regardless of a state of the second switch. A second control unit that determines whether or not the motor is permitted to drive;
The first control unit controls driving of the motor in accordance with an operation of the first switch on the condition that the driving of the motor is permitted by the second control unit. The power tool according to any one of the above.

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