JP2014188349A - Scissors with electric-assist function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scissors with an electric assist function which is sheared by a resultant force of a shearing force by a gripping force and a shearing force by a motor power and has an excellent cutting workability.
A pair of scissors with a power assist function that shears by a combined force of a shearing force by a gripping force and a shearing force by a motor, and a method of shearing an object to be sheared by opening and closing a pair of blade parts. The gripping portion (lever) and the power are connected by a power transmission wire, and a cutting force detecting means by gripping force is incorporated in one gripping portion, and the motor is turned ON / OFF by the cutting force detecting means. In the scissors with the electric assist function, the power transmission wire is attached to the end of one gripping part so as to be rotatable in a horizontal direction substantially perpendicular to the opening / closing direction of the gripping part.
[Selection] Figure 1

Description

  The present invention relates to a scissor with a power assist function that opens and closes a blade body with the power of a motor or the like, and more specifically, an improvement of a scissor with an electric assist function that shears by a resultant force of a shearing force by a gripping force and a shearing force by a power. It is about.

  Generally, as a scissor used for pruning a plant or the like, an object to be sheared is sheared by a manual opening and closing operation of a pair of blades rotatably supported by a support shaft, and the bases of the pair of blades Usually, the grip handle (lever) is fixed by a spring or the like, but the handle handle (lever) is operated with a stronger force when a large shear force is required only with the shear force of the hand. There was a need to do. For this reason, recently, various electric scissors that open and close the blade body with the power of the motor have been proposed in order to save labor.

  In Patent Document 1, a movable blade that rotates a trigger is configured to transmit the rotational power of the electric motor to the movable blade via gear engagement in an electric scissor that rotates using an electric motor as a drive source. The trigger operability is improved, and the trigger position and the position of the movable blade are detected by a sensor, so that the rotation support shaft of the trigger can be fixed and the movable blade can be rotated. Electric pruning scissors have been proposed that can be stopped at any position depending on the amount.

  In Patent Document 2, when a drive shaft is displaced in a direction in which an angle formed by two links bent with a motor drive shaft as a fulcrum is opened by a toggle link mechanism, two blade portions (blade bodies) connected to the two links are disclosed. Has been proposed, and the generated shearing force is increased, and electric scissors having a configuration in which a large shearing torque is generated in the latter half of the operation of closing the two blade portions (blade bodies) have been proposed.

  However, since the conventional electric scissors having the electric assist function including the two types of electric scissors described above all open and close the blade portion (blade body) only by the power of the motor, a large shear force is obtained. Requires a high-power motor / battery, which necessitates an increase in the size and weight of the scissors as a whole. In addition to avoiding an increase in cost, the increase in the size of the scissors causes a deterioration in operability and increases the weight. This is not preferable because it places a heavy burden on the hand. In addition, when the battery is consumed and the motor does not operate, the scissors cannot be used unless recharging is performed, and it is necessary to use a reversible motor or gear to open the blade (blade). Because the blade (blade) is opened and closed at a constant speed regardless of the shear load of the workpiece, the blade (blade) is opened and closed according to the shear load of the workpiece. In addition, there are drawbacks such as inability to suppress battery consumption.

Therefore, the present inventors have previously proposed scissors with an electric assist function that can eliminate the drawbacks of the electric scissors having the conventional electric assist function described above (Japanese Patent Application No. 2012-258926).
In other words, the scissors with electric assist function are sheared by the combined force of the shearing force by the gripping force and the shearing force by the power, eliminating the need for a high-output motor / battery, reducing size and weight (improving operability) and reducing costs. In addition to being peeled off, it can continue to be used as conventional manual scissors even when the battery is consumed and the motor does not operate, and the blade (blade) can be used in accordance with the shear load of the object to be sheared. It has a feature that it can perform an opening and closing operation, and its structure is a method of shearing an object to be sheared by an opening and closing operation of a pair of blade parts rotatably supported by a support shaft, and the pair of blades In the scissors having springs (return springs) for energizing the gripping parts between the gripping parts (lever) of each part so as to open them freely, -) And a motor as a power source are connected by a power transmission wire, and a cutting force detecting means by gripping force is incorporated in one gripping portion (lever), and the cutting force detecting means turns the motor on / off. It is a composition.

JP-A-11-128561 JP 2010-172622 A

However, the scissors with the electric assist function previously proposed by the present inventors have the following problems.
That is, the gripping portion side of the power transmission wire connecting the pair of gripping portions (lever) and the motor that is the power source is opened and closed (vertical direction) of the gripping portion by the shaft pin at the end of one gripping portion. The wire support member is pivotally attached to the wire connection member at the end of the other gripping portion, but the wire support member is simply pivoted to the end of the gripping portion by an axial pin. In consideration of various movements when using the scissors, it is not attached to the end of the gripping part, and is almost attached to the gripping part (lever). For this reason, when this scissor with electric assist function is tilted in various directions according to the position of an object to be sheared such as a tree, the power transmission wire swings greatly following the movement of the hand with the scissors. In this case, there arises a problem that the power transmission wire interferes with a tree branch or the like to obstruct the workability.

  The present invention has been made to solve the above-mentioned problem of scissors with an electric assist function, and the power transmission wire incorporated in the end of one gripping part (lever) can move the gripping part as much as possible. By attaching the power transmission wire to the end of the gripping part so that it can rotate in the horizontal direction (left-right direction) with respect to the gripping part so that it does not follow, power is transmitted to the movement of scissors in various directions. An object of the present invention is to provide a scissors with an electric assist function that can significantly improve the shear workability because the movement of the wire for use is greatly suppressed.

  The scissors with electric assist function according to the present invention is a pair of scissors with a power assist function that shears by the resultant force of the shearing force by the gripping force and the shearing force by the power of the motor, and is rotatably supported by the support shaft. A method of shearing an object to be sheared by opening and closing operation of the blade part, and having a spring that biases both gripping parts to open and open between the gripping parts of the pair of blade parts, and the pair of grips And a motor as a power source are connected by a power transmission wire, and a cutting force detecting means by gripping force is incorporated in one gripping part, and the motor is turned ON / OFF by the cutting force detecting means. In the scissors with the electric assist function, the power transmission wire is attached to the end of the one gripping part (lever) in a horizontal direction (left and right) substantially perpendicular to the opening / closing direction (vertical direction) of the gripping part (lever). It is characterized in that no a configuration in which attached to be constant angular rotation through a wire rotation mechanism which rotates direction).

Further, according to the present invention, as the power transmission wire rotating mechanism, the wire is bolted to the wire support member protruding in the length direction of the gripping portion at the end of the gripping portion (lever) via the guide tube. -An L-shape that is attached so that it can rotate in the horizontal direction (left-right direction) substantially perpendicular to the opening / closing direction (vertical direction) of the gripping part with a nut method, and is attached as if it rotates together with the wire in the horizontal direction. It is preferable to employ a mechanism in which the stopper member is in contact with stopper portions formed at both ends of the wire support member so that the wire can rotate at a constant angle.
In the present invention, the rotation angle of the power transmission wire is regulated by the stopper mechanism when the rotation angle of the power transmission wire is not regulated and is set to a free state. This is because when the scissors with the assist function are used, the power transmission wire is rotated to an unnecessary position, thereby hindering the use of the scissors.

  According to the scissors with the electric assist function of the present invention, the power transmission wire is attached to the end of one gripping part (lever) in the horizontal direction (left-right direction) substantially perpendicular to the opening / closing direction (vertical direction) of the gripping part (lever). The power transmission wire against the movement of the scissors when tilted in various directions according to the position of the object to be sheared such as a tree, etc. Therefore, the power transmission wire hardly interferes with the branches and the like, so that the shear workability can be remarkably improved.

It is a side view which partially fractures and shows one Example of a structure of the scissors with an electric assist function of this invention. It is a longitudinal cross-sectional view which expands and shows the principal part of the scissors with an electric assist function shown in FIG. It is a top view of the principal part of the scissors with an electric assist function shown in FIG.

As described above, the scissors with an electric assist function to be improved by the present invention have a pair of gripping portions (lever) and a power source motor connected by a power transmission wire, and one gripping portion (lever). Has a configuration in which a cutting force detecting means based on a gripping force is incorporated, and the motor is turned ON / OFF by the cutting force detecting means.
In the present invention, when the scissors with the electric assist function are used by being tilted in various directions according to the position of the object to be cut such as a tree, the wire is also tilted following the movement of the hand having the scissors with the electric assist function. In order to solve the problem that the wire interferes with the branches of the tree and obstructs the workability at that time, the power transmission wire incorporated in the end of one gripping part (lever) This is a system in which the gripping portion (lever) is attached via a rotating mechanism in a horizontal direction (left-right direction) substantially perpendicular to the opening / closing direction (vertical direction).
The scissors with electric assist function of the present invention shown in FIGS. 1 to 3 have a lever 1 having a first blade portion (blade body) 1-1 at the tip, and a second blade portion (blade) at the tip. The lever 2 having the body 2-1 is rotatably supported around the support shaft 3 as a fulcrum, and a spring (return spring) 4 is provided between the levers 1 and 2 of the pair of blade portions. The levers 1 and 2 are normally urged by a spring (return spring) 4 so that both levers 1 and 2 are opened.

  A power transmission wire 5 for transmitting the power of a motor (not shown) as a power source is connected to the ends of the pair of levers 1 and 2, and the motor (see FIG. (Not shown) is transmitted to the pair of levers 1 and 2.

  In addition, the cutting force detection means by gripping force that is incorporated in one lever 2 of the scissors to turn the motor on / off is configured to grasp the levers 1 and 2 of the scissors and move the sheared object W to a pair of blade parts 1-1, 2-1 When the cutting force applied to the blade portion is detected with a cantilever when sandwiched between 2-1, the motor is turned on / off according to the detected cutting force (load). Is a cantilever whose one end is fixed to the end portion on the side of the blade portion 2-1 on one side of the lever 2 and whose outward force is always urged by the leaf spring 6 attached to the lever 2 A beam 7 is provided, and is composed of the cantilever beam 7 and an ON / OFF switch 8 incorporated in the lever 2. In other words, this cutting force detecting means is normally used when the ON / OFF switch 8 is in the OFF state and the pair of blades 1-1 and 2-1 are sandwiched by holding the pair of levers 1 and 2 and holding the workpiece W. When the cantilever 7 is deflected by the gripping force and a load (load level) exceeding a certain level is applied, the ON / OFF switch 8 is pressed by the deflected cantilever 7 to be turned on. On the other hand, the cantilever When the load acting on 7 is small and no power is required, the cantilever 7 does not act and the ON / OFF switch 8 is turned off.

  The power transmission wire 5 for connecting the pair of levers to the motor as the power source has a structure in which an inner wire 5-2 is accommodated inside a tubular wire guide 5-1, as shown in FIG. The power of a motor (not shown) is transmitted to the pair of levers 1 and 2 through this wire, and the configuration is a wire drawing attached to the drive shaft of the motor. A power transmission wire 5 drawn by a member (not shown) is connected to the ends of the pair of levers 1 and 2. That is, the power transmission wire 5 having a structure in which the inner wire 5-2 is accommodated in the tubular wire guide 5-1, the inner wire is connected to the end of one lever 2 via the wire rotating mechanism 10 described later. The leading end portion 5-2 is connected to the wire connecting member 9 at the end portion of the other lever 1. Reference numeral 9-1 denotes a cap.

  The wire rotation mechanism 10 according to the present invention shown in FIGS. 1 to 3 has a tube-shaped wire on a wire guide support member 11 that protrudes in the length direction of the lever 2 at the end of the lever 2 opposite to the lever 1. The guide 5-1 has a structure that penetrates and supports the gripping portions (lever) 1 and 2 in the horizontal direction (left and right direction) substantially perpendicular to the opening and closing direction (vertical direction) of the gripping parts (lever) 1 and 2, and the structure is The substantially disc-shaped wire guide support member 11 having stopper portions 11-1 formed at both ends has an inner diameter through which a tube-shaped wire guide 5-1 having a male screw portion 5-1a formed at the outer periphery of the tip portion passes. A guide tube 12 slightly longer than the thickness of the wire guide support member 11 is penetrated, and a male screw portion 5-1a of a tube-shaped wire guide 5-1 in which an L-shaped stopper member 13 and a nut 14 are externally fitted to the guide tube 12 in advance. Penetrating Two nuts 14 screwed into the male screw portions 5-1a on the upper surface side and the lower surface side of the wire guide support member 11 of the tubular wire guide 5-1 are tightened, and the tubular wire guide 5 is attached to the wire guide support member 11. The L-shaped stopper member 13 that is attached so as to rotate integrally with the tubular wire guide 5-1, the guide tube 12, and the nut 14 is supported at both ends of the wire guide support member 11. This is a mechanism that abuts against the stopper portion 11-1 formed on the portion and restricts the rotation in the horizontal direction. In other words, the wire rotation mechanism 10 includes a tube-shaped wire guide 5-1 attached to a wire guide support member 11 so as to be rotatable by a bolt / nut system via a guide cylinder 12 and a nut 14, and a tube shape. The L-shaped stopper member 13 attached so as to rotate integrally with the wire guide 5-1 comes into contact with the stopper portions 11-1 formed at both ends of the wire guide support member 11, and the tubular wire guide. 5-1 can rotate the range of the angle θ separately from the levers 1 and 2 in the horizontal direction (left and right direction) substantially perpendicular to the opening and closing direction (vertical direction) of the levers 1 and 2. An example is shown in which the tubular wire guide 5-1 is provided so as to be rotatable about 90 degrees. Needless to say, the pivotable angle θ of the tubular wire guide 5-1 can be variously changed depending on the position where the stopper portion 11-1 provided on the wire guide support member 11 is formed. In the figure, 15 is a lead wire and 16 is a corrugated tube.

  In the scissors with the electric assist function configured as described above, with a power switch (not shown) turned on, the levers 1 and 2 are grasped by hand as shown in FIG. When sandwiched between 2-1, the cantilever 7 is deflected by a load exceeding a certain level due to the gripping force, and the ON / OFF switch 8 of the cutting force detecting means is pressed by the end of the bent cantilever 7 When turned ON, the motor is driven, the inner wire 5-2 housed inside the tubular wire guide 5-1 is drawn, and the blade portion 1-1 is obtained by the resultant force of the shearing force by the gripping force and the shearing force by the power. 2-1 is fully closed and the workpiece W is sheared. At this time, when the scissors with the electric assist function are used by being tilted in various directions according to the position of an object to be sheared such as a tree, the power transmission wire 5 connected to the end of one lever 2 is a wire. Since the rotation mechanism 10 can rotate approximately 90 degrees in the horizontal direction (left and right direction) substantially perpendicular to the opening and closing direction (vertical direction) of the levers 1 and 2 at the portion of the wire guide support member 11, various scissors Since the vibration of the power transmission wire 5 is remarkably suppressed and reduced with respect to a gentle movement, the power transmission wire 5 is almost eliminated from interfering with branches and the like, so that the shearing workability can be improved. . Further, since the turning angle of the power transmission wire 5 is restricted, the wire does not turn to an unnecessary position and does not hinder the use of the scissors.

1, 2 Lever 1-1, 2-1 Blade (blade)
3 Support shaft 4 Spring (return spring)
DESCRIPTION OF SYMBOLS 5 Power transmission wire 5-1 Tubular wire guide 5-1a Male thread part 5-2 Inner wire 6 Leaf spring 7 Cantilever 8 ON / OFF switch 9 Wire connection member 9-1 Cap 10 Wire rotation mechanism 11 Wire guide Support member 11-1 Stopper portion 12 Guide cylinder 13 L-shaped stopper member 14 Nut 15 Lead wire 16 Corrugated tube W Sheared object θ Rotation angle

Claims (2)

  This is a scissor with a power assist function that shears by the combined force of the shearing force by the gripping force and the power of the motor, and shears the object to be sheared by opening and closing the pair of blades that are supported rotatably by the support shaft. And a spring that urges both gripping portions to open between the gripping portions of the pair of blade portions, and the pair of gripping portions and a motor serving as a power source transmit power. In the scissors with an electric assist function, which is connected with a wire, and has a structure in which a cutting force detection means by gripping force is incorporated in one gripping part and the motor is turned on / off by the cutting force detection means. A structure in which a wire is attached to an end of the one gripping part (lever) so as to be able to rotate at a constant angle via a wire rotating mechanism that rotates in a horizontal direction substantially perpendicular to the opening / closing direction of the gripping part (lever). Electric assist function with scissors and said that without a.   The wire rotating mechanism is attached to a wire support member projecting from an end of a gripping portion so that the wire can be rotated by a bolt / nut system via a guide tube, and rotates integrally with the wire. The L-shaped stopper member attached as described above comes into contact with the stopper portions formed at both ends of the wire support member, and the wire can be rotated at a constant angle in a horizontal direction substantially perpendicular to the opening / closing direction of the gripping portion (lever). The scissors with electric assist function according to claim 1, wherein

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