JP2015058242A - Scissors with electric assist function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide scissors with an electric assist function that can always detect stably and accurately a full open position of a cutting part to turn ON/OFF a motor without requiring position adjustment for detecting means for the full open position of the cutting part.SOLUTION: Scissors with an electric assist function is devised to achieve cutting by combined force of cutting force generated by grip force and cutting force generated by power of a motor, which is devised to cut an object to be cut by opening/closing movement of a pair of cutting parts. The scissors with an electric assist function, in which a pair of gripping portions (levers) are connected to power through a wire for power transmission and detecting means for cutting force generated by the grip force is incorporated in one of the gripping portions, that turns ON/OFF the motor using the detecting means for cutting force, where detecting means for a full open position that detects the full open position of the opening/closing movement of the pair of cutting parts and turns ON/OFF the motor is incorporated in the gripping portion.

Description

  The present invention relates to a scissor having 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 cuts by a resultant force of a cutting force by a gripping force and a cutting force by a power. It is about.

  Generally, as a scissor used for pruning a plant or the like, an object to be cut is manually opened and closed by a pair of blades rotatably supported by a support shaft. Usually, the grip handle (lever) is fixed by a spring or the like, but only with the cutting force of the hand, the handle handle (lever) is operated with a stronger force when a large cutting force is required. 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. Electric scissors have been proposed in which the cutting force generated increases and the generated cutting force increases and a large cutting torque is generated in the latter half of the operation of closing the two blade parts (blade bodies).

  However, since the conventional electric scissors having the electric assist function including the two types of electric scissors described above are all systems that open and close the blade (blade body) only by the power of the motor, in order to obtain a large cutting force. Requires a high-power motor / battery, which necessitates an increase in the size and weight of the scissors as a whole. 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 cutting load of the workpiece, the blade (blade) is opened and closed according to the cutting 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 (Patent Document 3).
This scissors with electric assist function cuts by the combined force of cutting force by gripping force and cutting force by power, eliminating the need for a high-output motor / battery, reducing size and weight (improving operability) and reducing costs. It can be used as a conventional manual scissors even when the battery is consumed and the motor stops operating, and the blade (blade) can be opened and closed according to the cutting load of the workpiece. The structure is configured such that the workpiece is cut by an opening / closing operation of a pair of blade parts rotatably supported by a support shaft, and the pair of blade parts In the scissors having springs (return springs) for energizing both gripping portions between each gripping portion (lever) so as to be open, the pair of gripping portions (lever) A motor that is a power source is connected by a power transmission wire, and a cutting force detecting means (switch) by gripping force is incorporated in one gripping part (lever), and the motor is turned ON / OFF by the cutting force detecting means. As a means for that, a method of directly turning on / off the motor by the cutting force detection means, and a clutch such as an electromagnetic clutch is interposed between the motor and the power transmission means, and the clutch means A system is employed in which the power of the motor is transmitted to a power transmission wire drawing member attached to the rotating shaft of the motor. Among them, the method of transmitting the power of the motor to the wire drawing member by a clutch such as an electromagnetic clutch is such that when the cutting force detecting means is OFF, the motor and the clutch are in an inoperative state, and the cutting force detecting means is turned ON. A motor and a clutch operate | move, the motive power of a motor is transmitted to the wire drawing-in member for power transmission attached to the rotating shaft of the said motor, and it has the structure in which the wire for power transmission is drawn.

JP-A-11-128561 JP 2010-172622 A JP 2013-146544 A

However, the above-mentioned scissors with electric assist function previously proposed by the present inventors (Japanese Patent Laid-Open No. 2013-146544) have the following problems.
That is, a clutch such as an electromagnetic clutch is interposed between the motor and the power transmission means, and the power of the motor is transmitted to the power transmission wire drawing member attached to the rotating shaft of the motor by the clutch means. In the case of the scissors with the electric assist function that has a mechanism for drawing in the transmission wire, when the ON / OFF switch of the cutting force detection means is turned on, the clutch and the motor are operated to pull in the power transmission wire. Therefore, if the gripping part (lever) continues to be gripped with the pair of blades closed, the motor will remain on, but the power transmission wire will be pulled further. In view of safety, the motor remains in the ON state. For this reason, in consideration of safety, the fully closed position detecting means of the pair of blade parts for always keeping the motor and the clutch inoperative regardless of the operation of the cutting force detecting means by the gripping force incorporated in the gripping part. Is provided. As the fully-closed position detecting means of the blade part, for example, a mechanism in which a fully-closed position detecting switch is operated by rotation of a power transmission wire drawing member can be employed.
However, the fully-closed position detection means of the blade part using the power transmission wire retracting member etc. always keeps the motor and clutch in the inoperative state regardless of the operation of the cutting force detection means by the gripping force incorporated in the grip part. In the case of the laying method, a pair of blade portions is caused by the length error of the power transmission wire when the initial power transmission wire or the like is attached or the extension of the power transmission wire generated by the cutting load at the time of cutting the workpiece. The fully closed position detecting means of the blade part may be operated before the pair of blade parts are completely closed. There is a problem that it is necessary to readjust the operating position of the.

  The present invention has been made in view of the above-described problems. Even if an error occurs in the length of the power transmission wire of the motor or the extension of the power transmission wire due to a cutting load at the time of cutting the workpiece, the above-described problem has occurred. It is intended to provide scissors with an electric assist function that has a function capable of detecting the fully closed position of the blade part stably and accurately without requiring the position adjustment of the fully closed position detection means of the blade part. is there.

  The scissors with electric assist function according to the present invention is a pair of scissors with a power assist function that cuts by the resultant force of the cutting force by the gripping force and the cutting force by the power of the motor. A method of cutting a workpiece by opening and closing the blade portion, and having a spring that biases both gripping portions to open and open between the gripping portions of the pair of blade portions. In the scissors with electric assist function, the motor and the power source are connected by a power transmission wire, and the motor is turned on / off by the cutting force detection means by the gripping force incorporated in one gripping part. A fully-closed position detecting means for detecting the fully-closed position of the opening / closing operation of the pair of blade parts and turning the motor on / off is incorporated in the gripping part. That.

  Further, the cutting force detection means based on the gripping force in the above-described scissors with the electric assist function according to the present invention detects the cutting force applied to the blade part when the pair of gripping parts are gripped and the workpiece is sandwiched between the pair of blade parts. The motor is turned on / off in accordance with the detected cutting force, and is a cantilever mounted in a gripping part, a leaf spring attached to the cantilever, and the leaf spring. The ON / OFF switch is operated, and the ON / OFF switch is turned ON via the leaf spring by a certain load or more acting on the cantilever, and the blade portion is fully closed. The detection means is composed of a slide pin incorporated in the gripping portion opposite to the cutting force detection leaf spring of the cutting force detection means, and a fully closed position detection leaf spring attached to the other gripping portion. The blade is fully closed In this case, the ON / OFF switch is turned OFF when the slide pin is pressed by the fully closed position detecting plate spring attached to the other gripping portion and the cutting force detecting plate spring is pressed. It is characterized by being.

  The scissors with electric assist function of the present invention has a function that can turn off the ON / OFF switch of the cutting force detecting means by the fully-closed position detecting means for detecting the state in which the blade portion is completely closed in the pair of gripping portions. Therefore, even if the length error of the power transmission wire of the motor or the extension of the power transmission wire due to the cutting load at the time of cutting the workpiece occurs, it is always stable and accurate without being affected by these. The motor can be turned off by detecting the fully closed position of the blade portion. Moreover, the cutting force detection means and the blade fully closed position detection means share a cantilever beam, a leaf spring attached to the beam, and an ON / OFF switch operated by the leaf spring. The cost is low and the cost is low.

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. FIG. 3 is an enlarged vertical cross-sectional view showing a state (switch ON state) when a cutting force detection means is operating when cutting an object with the electric assist function shown in FIGS. 1 and 2; FIG. 3 is an enlarged vertical cross-sectional view showing a state (switch OFF state) when a full-closed position detecting means of a blade part is activated when cutting of an object to be cut of the scissors with electric assist function shown in FIGS. 1 and 2 is completed.

As the scissors with an electric assist function to be improved in the present invention, for example, as described above, a pair of gripping portions (lever) and a motor as a power source are connected by a power transmission wire, and one gripping portion ( The lever is incorporated with cutting force detection means by gripping force, and the cutting force detection means is used to turn on and off the motor and clutch. The power of the motor is transmitted to the rotating shaft of the motor via the clutch. In addition to adopting a method of transmitting to the attached power transmission wire pull-in member, considering the safety, the motor and clutch are always deactivated regardless of the operation of the cutting force detection means by the gripping force incorporated in the gripping part A fully closed position detecting means for the pair of blade portions for maintaining the state is provided.
According to the present invention, in the scissors with the electric assist function, the full-closed position detecting means of the pair of blade portions as described above, the length error of the power transmission wire when the initial power transmission wire or the like is attached, Due to the extension of the power transmission wire generated by the cutting load at the time of cutting the cut object, a deviation occurs between the fully closed position where the pair of blades are closed and the fully closed position detecting means operating position, and the operating position of the fully closed position detecting means is In order to solve the problem of requiring readjustment, a system in which a fully closed position detecting means for detecting the fully closed position of the opening / closing operation of the pair of blade parts is incorporated in the gripping part is adopted.

  1 to FIG. 4, the scissors with electric assist function according to the present invention includes 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.

  The cutting force detection means based on the gripping force for turning on / off the motor, which is incorporated in one lever 2 of the scissors, grips the levers 1 and 2 of the scissors and pulls the workpiece W into a pair of blade parts 1-1 and 2- 1 is detected by a cantilever 7 with one end attached to one lever 2, and the motor is turned on according to the detected cutting force (load). The structure of the cantilever 7 is such that a cantilever 7 constantly biased outward by a coil spring 6 mounted inside one lever 2 and the cantilever 7 A cutting force detection leaf spring 8 attached to the end portion by a bolt 9 and an ON / OFF switch 10 that operates via the leaf spring 8 are constituted. In other words, this cutting force detecting means is normally used when the ON / OFF switch 10 is in the OFF state and the workpiece W is sandwiched between the pair of blade parts 1-1 and 2-1 by holding the pair of levers 1 and 2. When the cantilever 7 is bent by the gripping force and a load (load level) exceeding a certain level is applied, the ON / OFF switch 10 is pressed by the bent cantilever 7 via the cutting force detection leaf spring 8. On the other hand, when the load acting on the cantilever 7 is small and no power is required, the cantilever 7 does not act and the ON / OFF switch 10 is turned off.

  Further, the fully closed position detecting means of the pair of blade parts 1-1, 2-1 is close to the ON / OFF switch 10 of one lever 2 in which the cutting force detecting means is incorporated, and detects the cutting force. One slide pin 11 attached to the lower position of the plate spring 8 so that the inner end protrudes, and attached to the inner surface side of the other lever 1 at a position opposite to the slide pin 11. It is comprised with the leaf | plate spring 12 for fully closed position detection. The slide pin 11 includes a shaft portion 11-1 and a head portion 11-2 having a larger diameter than the shaft portion, and the shaft portion 11-1 is slidably mounted in a guide hole 11-3 provided in the lever 2. It has been. In this fully closed position detecting means, the slide pin 11 is detected by the fully closed position detecting leaf spring 12 attached to the other lever 1 as the pair of levers 1 and 2 are closed. When the blades 1-1 and 2-1 are completely closed against the lever 2 and the blades 1-1 and 2-1 are completely closed, the cutting force detecting plate spring 8 is further pressed by the slide pin 11 by the gripping force. The detection leaf spring 8 is bent outward and is separated from the ON / OFF switch 10 so that the switch is turned off. When the levers 1 and 2 are open, the slide pin 11 is slid inward by its own weight or the restoring force of the cutting force detecting leaf spring 8 so that the end of the shaft 11-1 is the lever 2. It protrudes more and is locked by the head 11-2.

A power transmission wire 5 for connecting the pair of levers 1 and 2 to a motor as a power source has a structure in which an inner wire 5-2 is accommodated inside a tubular wire guide 5-1. Thus, the power of the motor is transmitted to the levers 1 and 2 through this wire, and the structure is a power drawn by a wire drawing member (not shown) attached to the drive shaft of the motor. A transmission wire 5 is connected to the ends of the pair of levers 1 and 2. The power transmission wire 5 having a structure in which the inner wire 5-2 is accommodated inside the tubular wire guide 5-1 is connected to the wire guide support member 15 provided at the end of one lever 2. A guide 5-1 is pivotally attached by a bolt / nut system via a guide cylinder 13 and a nut 14, and the tip of the inner wire 5-2 is connected to the wire connecting member 16 at the end of the other lever 1. It is connected.
In the figure, 17 is a lead wire and 18 is a corrugated tube.

In the scissors with the electric assist function configured as described above, the power switch (not shown) is turned on (FIG. 1), the levers 1 and 2 are held, and the workpiece W is moved by the pair of blade parts 1-1 and 2-1. When pinched, a load of a certain level or more is applied due to the gripping force and the cantilever 7 is deflected, and the ON / OFF switch 10 is turned by the cutting force detection leaf spring 8 attached to the end of the bent cantilever 7. When pressed and 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- is obtained by the resultant force of the cutting force by the gripping force and the cutting force by the power. 1 and 2 are fully closed, and the workpiece W is cut.
After that, when the cutting of the workpiece W is finished and the levers 1 and 2 are closed and the blade parts 1-1 and 2-1 are completely closed, the gripping force of the pair of blade parts 1-1 and 2-1 When the slide pin 11 is pushed into the lever 2 against the cutting force detecting plate spring 8 via the fully closed position detecting plate spring 12 of the fully closed position detecting means, the cutting force detecting plate spring 8 is moved. When the switch is turned off after being bent away from the ON / OFF switch 10, the clutch interposed between the motor and the power transmission means and the motor are deactivated, and the motor stopped state can be maintained. it can.
Thus, the scissors with electric assist function of the present invention can turn off the ON / OFF switch of the cutting force detection means by the fully closed position detection means that detects the state in which the blade part is completely closed in the pair of gripping parts. Even if there is an error in the length of the power transmission wire of the motor or the extension of the power transmission wire due to the cutting load when cutting the workpiece, the blade is always stable and accurate without being affected by these. The fully closed position can be detected to turn off the motor and the clutch.

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 5-2 Inner wire 6 Coil spring 7 Cantilever 8 Cutting force detection leaf spring 9 Bolt 10 ON / OFF switch 11 Slide pin 11-1 Shaft 11-2 Head 11-3 Guide hole 12 Fully closed position detection leaf spring 13 Guide cylinder 14 Nut 15 Wire guide support member 16 Wire connection member 17 Lead wire 18 Corrugated tube

Claims (2)

  A scissors with a power assist function that cuts by the combined force of the cutting force by the gripping force and the power of the motor, and cuts the workpiece by opening and closing a pair of blades that are rotatably supported 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. The pair of blades in the scissors with an electric assist function, which is connected by a wire for use, 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 An electric actuator comprising: a fully-closed position detecting means for detecting a fully-closed position of the opening / closing operation of the part and turning on / off the motor by the cutting force detecting means. Strike function with scissors.   The cutting force detection means based on the gripping force detects the cutting force applied to the blade portion when the pair of gripping portions are gripped and the object to be cut is sandwiched between the pair of blade portions, and the motor according to the detected cutting force ON / OFF, comprising a cantilever built into the gripping part, a leaf spring attached to the cantilever, and an ON / OFF switch operated by the leaf spring. The ON / OFF switch is turned on via the leaf spring by a certain load or more acting on the holding beam, and the fully closed position detection means of the blade portion is detected by the cutting force detection means. Consists of a slide pin incorporated in the gripping part opposite to the plate spring for use and a leaf spring attached to the other gripping part, and attached to the other gripping part in the fully closed position of the blade part The spring is detected via a fully closed position detection leaf spring. Motor-assisted function scissors according to claim 1, wherein the ON / OFF switch is without a mechanism to be OFF by Idopin presses the cutting force detection plate spring pressed.

Images