JP2013166244A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool equipped with a mechanism for electrically stopping operation.SOLUTION: An electric scissor 1A includes: a first switch 11 for outputting a signal for controlling the operation of a motor 5 to stop; a sub-trigger 12 for operating the first switch 11; a second switch 13 for outputting a signal for controlling the operation of the motor 5; a main trigger 14 for operating the second switch 13; and a controller 10 for stopping the operation of the motor 5 when the sub-trigger 12 is displaced in an non-operating position and the first switch 11 is turned off.

Description

  The present invention relates to an electric power tool used by hand.

  As an electric tool that is used by being held by hand, electric scissors have been proposed in which a blade portion is opened and closed by a driving force of a motor so that a cutting object such as a branch tree can be cut.

  The electric scissors have an operation unit called a trigger or the like, and a switch is operated by displacing the trigger with a finger to control a drive unit such as a motor. (For example, refer to Patent Document 1).

Japanese Patent No. 2735218

  In a conventional electric tool that is used by being held with hands such as electric scissors, the operation of the operation unit can be mechanically locked to prevent erroneous operation. And what is provided with the mechanism which electrically stops operation | movement other than a power switch is desired.

  The present invention has been made to solve such a problem, and an object thereof is to provide an electric tool including a mechanism for electrically stopping operation.

  In order to solve the above-described problems, the present invention provides a main switch that outputs a signal that controls the operation of the drive unit, a main operation unit that operates the main switch, and a sub-switch that outputs a signal that controls the operation stop of the drive unit. A switch and a sub-operation unit for operating the sub-switch, and the operation of the drive unit is controlled based on a control signal output from the main switch according to the operation direction, operation amount, and operation speed of the main operation unit. The power tool that operates the drive unit according to the operation direction, operation amount, and operation speed of the unit, and the sub switch is moved from the non-operation position to the operation position. Then, a signal that enables the operation of the drive unit is output, and when the sub operation unit is displaced to the non-operation position, a signal that stops the operation of the drive unit is output, and the sub operation unit is displaced to the non-operation position. , Main operation by locking to the main operation part It is a power tool is provided with a regulating portion for regulating the displacement.

  In the present invention, when the sub operation unit is displaced to the non-operation position, the displacement of the main operation unit is restricted, and the main operation unit cannot be operated. In addition, a signal for stopping the operation of the drive unit is output. The main operation unit can be operated by moving the sub operation unit to the operation position, and when the sub operation unit is operated, the main operation unit operates when a signal enabling operation is output from the sub switch. Thus, the operation of the drive unit is controlled by the control signal output from the main switch.

  According to the present invention, in a state where the sub operation unit is not operated and is in the non-operation position, a signal for stopping the operation of the drive unit by the sub switch is output, and the regulation unit is locked to the main operation unit. Since the displacement of the operation unit is restricted, the drive unit does not operate and the main operation unit cannot be operated, so that safety is improved.

It is a sectional side view which shows an example of a structure of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of a structure of the electric scissors of 1st Embodiment. It is a side view which shows an example of a structure of the electric scissors of 1st Embodiment. It is a principal part sectional side view which shows an example of the operation part in the electric scissors of 1st Embodiment. It is a functional block diagram which shows an example of the control function of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment. It is a sectional side view which shows an example of operation | movement of the electric scissors of 1st Embodiment.

  Hereinafter, an embodiment of electric scissors as an example of the electric tool of the present invention will be described with reference to the drawings.

<Configuration example of the electric scissors of the first embodiment>
1 and 2 are side sectional views showing an example of the configuration of the electric scissors according to the first embodiment. FIG. 1 shows a state in which the blade is opened, and FIG. 2 shows a state in which the blade is closed. . FIG. 3 is a side view showing an example of the configuration of the electric scissors according to the first embodiment.

  In the electric scissors 1A of the first embodiment, the first movable blade 2A and the second movable blade 3A are supported so as to be rotatable about the shaft 4A.

  In the electric scissors 1A, the rotation operation of the motor 5 is converted into a linear operation by the ball screw mechanism 6, and the driving force of the motor 5 converted into the linear operation is converted into the first movable blade 2A and the second by the toggle link mechanism 7A. Transmitted to the movable blade 3A, the first movable blade 2A and the second movable blade 3A are opened and closed by a rotating operation with the shaft 4A as a fulcrum.

  The electric scissors 1A are provided with two frames 8A sandwiching the ball screw mechanism 6, the shaft 4A is supported by the frame 8A, and the movement of the ball screw mechanism 6 and the toggle link mechanism 7A is guided by the frame 8A. Further, the electric scissors 1 </ b> A has a configuration in which each component described above is attached to the housing 9, and the user can work with the housing 9.

  Details of each component will be described below. The first movable blade 2A is an example of a first blade portion. The first movable blade 2A is provided with a blade forming portion 20A on one side across the support position by the shaft 4A, and the angle formed with the blade forming portion 20A is predetermined on the other side. The blade arm 21A is provided as a transmission portion formed at an obtuse angle. In the first movable blade 2A, the blade forming portion 20A and the blade arm 21A may be integrated. However, in order to facilitate replacement of the blade forming portion 20A, the blade forming portion 20A and the blade arm 21A are independent components. It is good to configure.

  The second movable blade 3A is an example of a second blade portion. The second movable blade 3A is provided with a blade forming portion 30A on one side across the support position by the shaft 4A, and the angle formed with the blade forming portion 30A is predetermined on the other side. The blade arm 31A is provided as a transmission portion formed at an obtuse angle. Similarly to the first movable blade 2A, the second movable blade 3A may be configured such that the blade forming portion 30A and the blade arm 31A are integrated, but in order to facilitate replacement of the blade forming portion 30A, the blade forming portion 30A and the blade arm 31A may be composed of independent parts.

  In the first movable blade 2A and the second movable blade 3A, the blade forming portion 20A and the blade forming portion 30A are exposed from the housing 9, and the shaft 4A is attached to the frame 8A by the mounting bracket 40A. The first movable blade 2A and the second movable blade 3A are configured such that the blade forming portions 20A and 30A can be exchanged by attaching and detaching the mounting bracket 40A and the shaft 4A.

  The motor 5 and the ball screw mechanism 6 are examples of a drive unit, and the motor 5 is connected to a reduction gear 50 whose drive shaft uses, for example, a planetary gear. The ball screw mechanism 6 includes a screw shaft 60 connected to the output shaft of the speed reducer 50 and a nut portion 61 in which a ball (not shown) to be inserted into a screw groove of the screw shaft 60 is incorporated.

  In the ball screw mechanism 6, a guide shaft 62 provided on the nut portion 61 is inserted into a guide groove 80 provided on the frame 8 </ b> A in a direction parallel to the screw shaft 60. In the ball screw mechanism 6, when the screw shaft 60 is driven to rotate, the rotation of the nut portion 61 about the screw shaft 60 is regulated by the guide shaft 62 being guided in the guide groove 80, and the nut portion 61 is screwed. Move linearly along axis 60.

  Thereby, in the ball screw mechanism 6, the rotation operation of the motor 5 is converted into the linear operation of the nut portion 61, and the moving direction of the nut portion 61 is switched according to the rotation direction of the motor 5.

  The toggle link mechanism 7A includes a first link 71A and a second link 72A that are rotatably connected by a drive shaft 70A. In the toggle link mechanism 7A, one end of the first link 71A and the blade arm 21A of the first movable blade 2A are rotatably connected with a shaft 73A as a fulcrum. In addition, one end of the second link 72A and the blade arm 31A of the second movable blade 3A are rotatably connected with the shaft 74A as a fulcrum. Furthermore, the other end portion of the first link 71A and the other end portion of the second link 72A are rotatably connected with the drive shaft 70A as a fulcrum.

  The toggle link mechanism 7A is configured such that the blade arm 21A of the first movable blade 2A and the first link 71A are bent at the connecting portion by the shaft 73A, and the blade arm 31A and the second link of the second movable blade 3A. 72A is bent at the connecting portion by the shaft 74A. Further, the first link 71A and the second link 72A are bent at the connecting portion by the drive shaft 70A.

  The toggle link mechanism 7A is supported such that the drive shaft 70A is guided by the guide groove 80 of the frame 8A and is movable in a direction parallel to the screw shaft 60. In the toggle link mechanism 7A, the drive shaft 70A is connected to the nut portion 61 by the transmission member 75, and the ball screw mechanism 6 linearly moves in conjunction with the nut portion 61 in which the rotation operation of the motor 5 is converted into a linear operation.

  The first movable blade 2A and the second movable blade 3A are opened and closed by a rotation operation about the shaft 4A, and the blade arm 21A of the first movable blade 2A and the blade arm 31A of the second movable blade 3A are opened and closed. It closes by turning in the opening direction.

  In the toggle link mechanism 7A, the first link 71A and the second link 72A, which are bent at the connection portion by the drive shaft 70A, are operated so that the first movable blade 2A and the second movable blade 3A are closed. In conjunction with this, the drive shaft 70A that moves linearly rotates around the fulcrum in the direction in which the angle between the first link 71A and the second link 72A opens. Then, when the first movable blade 2A and the second movable blade 3A are closed, the dimensions and angles of the respective parts are determined so that the angle formed by the first link 71A and the second link 72A approaches 180 °. . If the angle formed by the first link 71A and the second link 72A exceeds 180 °, the first movable blade 2A and the second movable blade 3A rotate in the opening direction, so the first link 71A. And the second link 72A are configured so that the angle does not exceed 180 °.

  FIG. 4 is a principal side sectional view showing an example of an operation unit in the electric scissors according to the first embodiment, and FIG. 5 is a functional block diagram showing an example of a control function of the electric scissors according to the first embodiment. is there.

  The electric scissors 1A includes a control unit 10 that controls the opening and closing operations of the first movable blade 2A and the second movable blade 3A. The electric scissors 1 </ b> A outputs a sub trigger 12 that is linked to the first switch 11 that outputs a signal for stopping the operation of the motor 5, and a control signal that controls the rotation direction, rotation amount, and rotation speed of the motor 5. A main trigger 14 interlocking with the second switch 13 is provided.

  The first switch 11 is an example of a sub switch, and for example, switches the power supplied from the battery 10a to the motor 5 on and off. When the first switch 11 is off, the control unit 10 stops supplying power to the drive unit 10b that drives the motor 5. Note that when the first switch 11 is switched from on to off, the control unit 10 rotates the motor 5 in the direction in which the first movable blade 2A and the second movable blade 3A are opened, and then stops the operation. You may control.

  The second switch 13 is an example of a main switch, and outputs a control signal corresponding to the operation of the main trigger 14.

  The sub-trigger 12 and the main trigger 14 are arranged along the longitudinal direction of the housing 9 so that the sub-trigger 12 can be operated with the middle finger and the main trigger 14 can be operated with the index finger. Be placed.

  The sub-trigger 12 is an example of a sub-operation unit, and is attached to the housing 9 so as to be rotatable about a shaft 12a provided on the main trigger 14 side, and the first switch 11 is turned off. The switch 11 is displaced from the operation position A2 where the switch 11 is turned on.

  The sub trigger 12 is urged by the spring 12b toward the non-operation position A1, and is held at the non-operation position A1 when no external force is applied manually. When the secondary trigger 12 is pulled by a finger, the secondary trigger 12 rotates against the spring 12b with the shaft 12a as a fulcrum and is displaced to the operation position A2, and the first switch 11 is pressed to turn it on.

  When the finger is released from the sub-trigger 12, the sub-trigger 12 is rotated about the shaft 12a by the force restored by the spring 12b and displaced to the non-operation position A1, and the first switch 11 is turned off.

  The sub trigger 12 includes a regulation protrusion 12 c that regulates the operation of the main trigger 14. The restricting protrusion 12c is an example of a restricting portion. When the sub trigger 12 is displaced to the non-operation position A1, the restricting protrusion 12c protrudes to the displacement locus C in the outer peripheral portion of the main trigger 14, and when the sub trigger 12 is displaced to the operation position A2, Retreat from the displacement locus C.

  The main trigger 14 is an example of a main operation unit, and is attached to the shaft 13a of the second switch 13, and the first movable blade 2A and the second movable blade 3A are rotated while the shaft 13a of the second switch 13 is rotated. It is displaced between an open position B1 that is opened and a closed position B2 that is closed by the first movable blade 2A and the second movable blade 3A.

  A shaft 13a serving as a fulcrum of rotation of the main trigger 14 is provided on the side opposite to the sub trigger 12, and the displacement trajectory C of the main trigger 14 has an arc shape centered on the shaft 13a.

  The main trigger 14 is urged toward the open position B1 by the spring 14a, and is held at the open position B1 when no external force is applied manually. When the main trigger 14 is pulled by the finger, the main trigger 14 is displaced to the closed position B2 while rotating the shaft 13a of the second switch 13 against the spring 14a.

  When the finger is released from the main trigger 14, the main trigger 14 is displaced to the open position B1 while rotating the shaft 13a of the second switch 13 by the force restored by the spring 14a.

  When the shaft 13a rotates by operating the main trigger 14, the second switch 13 outputs a control signal according to the rotation direction, the rotation amount, and the rotation speed, and the control unit 10 determines the movement of the main trigger 14. In addition, the motor 5 is controlled.

  The main trigger 14 includes a trigger lock 15 to which the sub trigger 12 is locked. The trigger lock 15 is an example of an operation restricting portion. The trigger lock 15 is rotatably supported by the shaft 15a on the side facing the sub trigger 12, and the main lock position 15 is engaged with the restricting projection 12c of the sub trigger 12. It is displaced from the displacement locus C of the trigger 14 to the retracted position D2 retracted inward.

  The trigger lock 15 is biased in the direction of the restriction position D1 by the spring 15b, and is held at the restriction position D1 when no external force is applied. When the sub trigger 12 is in the non-operation position A1, when the main trigger 14 is displaced from the closed position B2 to the open position B1, the trigger is pressed against the spring 15b by being pushed by the restriction projection 12c of the sub trigger 12. The lock 15 rotates about the shaft 15a and is displaced to the retracted position D2. The trigger lock 15 includes a retraction mechanism with a shaft 15a and a spring 15b.

  The trigger lock 15 is formed with a retracting recess 15c into which the restricting protrusion 12c enters at a position facing the restricting protrusion 12c of the sub trigger 12 in a state where the main trigger 14 is in the closed position B2.

  In the electric scissors 1A, when the sub-trigger 12 is not operated and is in the non-operation position A1, the first switch 11 is off and no power is supplied. When the sub trigger 12 is in the non-operation position A1 and the main trigger 14 is in the open position B1, the trigger lock 15 is in the restriction position D1, the restriction protrusion 12c is locked to the trigger lock 15, and the main trigger 14 operations are restricted.

  When the sub trigger 12 is operated and displaced to the operation position A2, the first switch 11 is turned on and the power is turned on, and the restricting projection 12c is released from the trigger lock 15 of the main trigger 14. Thereby, the main trigger 14 can be operated.

  When the main trigger 14 is operated while the sub trigger 12 is held at the operation position A2, a control signal corresponding to the rotation direction, rotation amount, and rotation speed between the open position B1 and the closed position B2 of the main trigger 14 is second. The motor 5 is controlled in accordance with the movement of the main trigger 14.

<Operation example of the electric scissors of the first embodiment>
6 to 11 are side cross-sectional views showing an example of the operation of the electric scissors according to the first embodiment. Next, the operation of the electric scissors 1A according to the first embodiment will be described with reference to the drawings. .

  As shown in FIG. 6, when the sub-trigger 12 is not operated by the user, the electric scissor 1A is pushed by the spring 12b and displaced to the non-operation position A1, and the first switch 11 is turned off. It is a state.

  When the sub trigger 12 is at the non-operation position A1 and the main trigger 14 is at the open position B1, the trigger lock 15 is pushed by the spring 15b and displaced to the restriction position D1. As a result, the restricting projection 12c of the sub trigger 12 is locked to the trigger lock 15 of the main trigger 14, and the main trigger 14 cannot be pulled.

  Thus, in a state where the sub trigger 12 is not operated and is in the non-operation position A1, the first switch 11 is off and the power is not turned on, and the main trigger 14 cannot be pulled due to a mechanical lock. So safety is improved.

  When using the electric scissors 1 </ b> A, the user operates the auxiliary trigger 12 with the housing 9. When the secondary trigger 12 is pulled with a finger in the direction of the arrow G1, as shown in FIG. 7, the secondary trigger 12 rotates against the spring 12b with the shaft 12a as a fulcrum and is displaced to the operation position A2, and the first switch Press 11 to turn it on. Further, when the sub trigger 12 is displaced to the operation position A <b> 2, the restriction projection 12 c of the sub trigger 12 is retracted from the displacement locus C of the main trigger 14.

  Thereby, in the electric scissors 1A, when the sub trigger 12 is pulled and displaced to the operation position A2, the power is turned on by an electrical switch. Further, the mechanical lock of the main trigger 14 by the sub trigger 12 that prevents the main trigger 14 from moving from the open position B1 is released, and the main trigger 14 can be operated.

  The user operates the main trigger 14 with the sub trigger 12 held at the operation position A2. When the main trigger 14 is pulled with a finger in the direction of the arrow G2, the main trigger 14 is displaced to the closed position B2 while rotating the shaft 13a of the second switch 13 against the spring 14a as shown in FIG. In the electric scissors 1A, the shaft 13a of the second switch 13 is rotated by the displacement of the main trigger 14, so that a control signal corresponding to the rotation direction, the rotation amount, and the rotation speed of the main trigger 14 is output by the second switch 13. Then, the motor 5 is controlled in accordance with the movement of the main trigger 14.

  When the electric scissors 1A are displaced in the direction of gripping the main trigger 14, the first movable blade 2A and the second movable blade 3A are closed, and when the main trigger 14 is moved away, the first movable blade 2A The motor 5 is controlled in the direction in which the second movable blade 3A is opened.

  When the motor 5 is rotationally driven in the direction in which the first movable blade 2A and the second movable blade 3A are closed, the nut portion 61 linearly moves in the direction of the arrow F1 according to the rotational direction of the screw shaft 60.

  When the motor 5 is rotationally driven in a predetermined direction and the nut portion 61 moves linearly in the direction of the arrow F1, the drive shaft 70A of the toggle link mechanism 7A connected by the nut portion 61 and the transmission member 75 is moved to the first movable blade 2A. And linearly moves in the direction of arrow F1, which is a direction approaching the axis 4A of the second movable blade 3A.

  In the toggle link mechanism 7A, the displacement due to the linear movement of the drive shaft 70A is transmitted to the first movable blade 2A by the first link 71A and also transmitted to the second movable blade 3A by the second link 72A. .

  As shown in FIG. 1, when the drive shaft 70A of the toggle link mechanism 7A moves linearly in the direction of arrow F1 from the state in which the first movable blade 2A and the second movable blade 3A are opened, the connecting portion by the drive shaft 70A The bent first link 71A and second link 72A rotate in a direction in which an angle formed by the first link 71A and the second link 72A opens with the driving shaft 70A moving linearly as a fulcrum. To do.

  The first movable blade 2A, in which the first link 71A is connected to the blade arm 21A, and the second movable blade 3A, in which the second link 72A is connected to the blade arm 31A, have the shaft 4A as a fulcrum, and the blade The angle formed by the arm 21A and the blade arm 31A rotates in the opening direction. When the angle between the blade arm 21A and the blade arm 31A is rotated in the opening direction, the first movable blade 2A and the second movable blade 3A are closed.

  When the first movable blade 2A and the second movable blade 3A are closed, the angle formed by the first link 71A and the second link 72A approaches 180 °. In the toggle link mechanism 7A, when the first movable blade 2A and the second movable blade 3A are closed, the angle formed by the first link 71A and the second link 72A approaches 180 °. The link 71 </ b> A and the second link 72 </ b> A approach the form of being aligned on a straight line.

  Accordingly, the first movable blade 2A and the second movable blade as shown in FIG. 2 are compared with the first closed state of the first movable blade 2A and the second movable blade 3A as shown in FIG. The cutting force generated by the blade forming portion 20A of the first movable blade 2A and the blade forming portion 30A of the second movable blade 3A increases when 3A is closed.

  When the motor 5 is rotationally driven in the direction in which the first movable blade 2A and the second movable blade 3A are opened, the nut portion 61 linearly moves in the direction of the arrow F2 according to the rotational direction of the screw shaft 60.

  When the motor 5 is rotationally driven in a predetermined reverse direction and the nut portion 61 moves linearly in the direction of the arrow F2, the drive shaft 70A of the toggle link mechanism 7A is moved to the shaft 4A of the first movable blade 2A and the second movable blade 3A. Move linearly in the direction of arrow F2, which is the direction away from the direction.

  As shown in FIG. 2, when the drive shaft 70A of the toggle link mechanism 7A moves linearly in the direction of the arrow F2 from the state in which the first movable blade 2A and the second movable blade 3A are closed, the first link 71A and the first link 71A The second link 72A rotates in the direction in which the angle formed by the first link 71A and the second link 72A closes with the drive shaft 70A moving linearly as a fulcrum.

  The first movable blade 2A, in which the first link 71A is connected to the blade arm 21A, and the second movable blade 3A, in which the second link 72A is connected to the blade arm 31A, have the shaft 4A as a fulcrum, and the blade The angle formed by the arm 21A and the blade arm 31A rotates in the closing direction. When the angle between the blade arm 21A and the blade arm 31A rotates in the closing direction, the first movable blade 2A and the second movable blade 3A are opened.

  The electric scissors 1A according to the first embodiment is used in the operation of opening and closing the movable blade described above. For example, when the operation of closing the movable blade is to be stopped urgently, or when the main trigger 14 is not returned, The operation can be stopped by operating the trigger 12.

  The user lifts the finger from the sub-trigger 12 with the main trigger 14 pulled and displaced to the closed position B2. As shown by the arrow G3, when the finger is released from the sub-trigger 12, the sub-trigger 12 rotates about the shaft 12a by the force restored by the spring 12b as shown in FIG. It is displaced to the operation position A1. When the sub trigger 12 is displaced to the non-operation position A1, the first switch 11 is turned off, the power supply is cut off, and the operation stops.

  When the sub trigger 12 is displaced from the operation position A 2 to the non-operation position A 1, the restricting projection 12 c protrudes on the displacement locus C of the main trigger 14. On the other hand, the trigger lock 15 of the main trigger 14 is formed with a retracting recess 15c into which the restricting protrusion 12c enters at a position facing the restricting protrusion 12c of the sub trigger 12 in a state where the main trigger 14 is in the closed position B2.

  As a result, when the sub trigger 12 is displaced from the operation position A2 to the non-operation position A1 while the main trigger 14 is in the closed position B2, the restricting projection 12c enters the retracting recess 15c of the trigger lock 15, and the main trigger 14 is closed. Even in the position B2, the rotation of the sub trigger 12 is not hindered.

  In the state where the main trigger 14 is in the closed position B2, after the sub trigger 12 is returned from the operation position A2 to the non-operation position A1 to stop the operation, the main trigger 14 is returned to the open position B1. The finger is released from the main trigger 14 while being held at the non-operation position A1 without being operated.

  When the finger is released from the main trigger 14 as shown by an arrow G4 with the sub-trigger 12 held at the non-operation position A1, as shown in FIG. 11, the main trigger 14 is moved to the shaft 13a by the force restored by the spring 14a. Is displaced to the open position B1.

  When the sub trigger 12 is in the non-operation position A1, the restriction projection 12c of the sub trigger 12 protrudes on the displacement locus C of the main trigger 14, and the main trigger 14 is displaced from the closed position B2 to the open position B1. The restricting protrusion 12 c contacts the trigger lock 15 of the trigger 14.

  The trigger lock 15 of the main trigger 14 is pushed by the restricting protrusion 12c of the sub trigger 12 while the main trigger 14 is displaced from the closed position B2 to the open position B1 while the sub trigger 12 is in the non-operation position A1. Thus, the shaft 15a rotates around the fulcrum against the spring 15b and is displaced to the retracted position D2.

  As a result, the trigger lock 15 of the main trigger 14 is retracted inward from the displacement trajectory C of the main trigger 14, so that even if the regulating projection 12 c of the sub trigger 12 protrudes into the displacement trajectory C of the main trigger 14, the main trigger 14 The main trigger 14 is displaced from the closed position B2 to the open position B1 while the sub trigger 12 is in the non-operation position A1.

  In this way, after the main trigger 14 is in the closed position B2, the sub trigger 12 is displaced from the operation position A2 to the non-operation position A1 to stop the operation, and then the sub trigger 12 is held at the non-operation position A1. If the main trigger 14 can be returned to the open position B1, the power is not turned on again, and safety is improved.

  In the electric scissors 1A, since the opening degree of the first movable blade 2A and the second movable blade 3A can be adjusted according to the rotation amount (displacement position) of the main trigger 14, the main trigger 14 is opened at the open position B1 and the closed position B2. There is a case where an operation of stopping at a position in the middle is performed.

  When the main trigger 14 is stopped at an intermediate position between the open position B1 and the closed position B2, when the finger is released from the sub trigger 12 held at the operation position A2, the sub trigger 12 is moved by the force restored by the spring 12b. The shaft 12a rotates around the fulcrum.

  In a state where the main trigger 14 is stopped at a position halfway between the open position B1 and the closed position B2, when the sub trigger 12 is displaced from the operation position A2 to the non-operation position A1, the main projection 14 is moved to the restriction projection 12c of the sub trigger 12. The trigger lock 15 of the trigger 14 is pressed.

  When the trigger lock 15 of the main trigger 14 is pushed by the restriction protrusion 12c of the sub trigger 12, the shaft 15a rotates around the fulcrum against the spring 15b and is displaced to the retracted position D2.

  Thereby, the sub trigger 12 can be displaced to the non-operation position A1, and when the sub trigger 12 is displaced to the non-operation position A1, the first switch 11 is turned off, the power supply is cut off, and the operation Stops.

  Further, if the finger is released from the main trigger 14 that is stopped at an intermediate position between the open position B1 and the closed position B2, the trigger lock 15 of the main trigger 14 is displaced to the retracted position D2. Is displaced to the non-operation position A1, and the main trigger 14 can be displaced to the open position B1.

  Thus, by providing the trigger lock 15 of the main trigger 14 with the retracting mechanism, the sub trigger 12 can be returned to the non-operation position A1 regardless of the displacement position of the main trigger 14, and safety is improved.

  The present invention is applied to an electric tool that is held by hand and used while operating an operation unit such as a trigger.

  1A ... electric scissors, 2A ... first movable blade, 3A ... second movable blade, 4A ... shaft, 5 ... motor, 6 ... ball screw mechanism, 7A ... Toggle link mechanism, 10 ... control unit, 11 ... first switch, 12 ... sub-trigger, 12a ... shaft, 12b ... spring, 12c ... regulating projection, 13 ... 1st switch, 13a ... shaft, 14 ... main trigger, 14a ... spring, 15 ... trigger lock, 15a ... shaft, 15b ... spring, 15c ... retracting recess

Claims (7)

A main switch that outputs a signal for controlling the operation of the drive unit;
A main operation unit for operating the main switch;
A sub switch for outputting a signal for controlling the operation stop of the driving unit;
A sub operation unit for operating the sub switch,
The operation of the drive unit is controlled based on the control signal output from the main switch according to the operation direction, operation amount and operation speed of the main operation unit, and the operation direction, operation amount and operation speed of the main operation unit are controlled. In response to the power tool, the operation of the drive unit is performed,
The sub switch outputs a signal that enables operation of the drive unit when the sub operation unit that is displaced between the non-operation position and the operation position is displaced to the operation position, and the sub operation unit is not operated. When displaced to a position, a signal to stop the operation of the drive unit is output,
The power tool according to claim 1, wherein the sub-operation unit includes a restriction unit that, when displaced to a non-operation position, engages with the main operation unit to restrict displacement of the main operation unit. When the sub-operation unit is displaced from the non-operation position to the operation position, a signal that enables operation of the drive unit with the sub-switch is output,
When the sub operation unit is displaced to the non-operation position, the main operation unit locked at the first position is the first position and the second position when the sub operation unit is displaced to the operation position. Can be displaced between
The drive unit operates in one direction when the main operation unit is displaced from the first position toward the second position, and the main operation unit is displaced from the second position toward the first position. The power tool according to claim 1, wherein the driving unit operates in another direction. The state in which the sub operation unit is displaced to the operation position is maintained, and the driving unit is moved in the other direction by the displacement of the main operation unit from the second position toward the first position. The power tool according to claim 2, wherein a signal for stopping the operation of the drive unit is output by an operation in which the operation unit is displaced to a non-operation position. When a signal for stopping the operation of the drive unit is output by an operation in which the sub operation unit is displaced to the non-operation position, the drive unit is moved by the displacement of the main operation unit from the second position toward the first position. The electric tool according to claim 2, wherein the operation of the drive unit is stopped after the operation in the other direction. The power tool according to claim 1, 2, 3, or 4, wherein the main operation unit and the sub operation unit are arranged side by side at a position where the operation can be performed with one hand holding the casing. The drive unit drives a blade part constituting the scissors,
The drive unit operates in one direction in which the blade portion closes due to the displacement of the main operation unit from the first position to the second position direction, and the main operation from the second position to the first position direction. The power tool according to claim 2, 3, 4, or 5, wherein the driving unit operates in another direction in which the blade portion is opened by displacement of the portion. The power tool according to claim 6, wherein the main operating portion is displaced from the second position to the first position and is biased in a direction in which the blade portion opens.

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