KR20230068191A - Electric scissors - Google Patents

Abstract

The present invention relates to electric scissors having a novel power transfer structure with reduced driving power of a drive motor. The electric scissors comprise: a drive motor generating torque by using electricity; a driveshaft receiving the torque of the drive motor to rotate, and having screw threads formed on the surface thereof; a moving member fastened to the screw threads of the driveshaft to move in accordance with the rotation of the driveshaft; two drive links of which one end is pin-connected to the moving member to change the position in accordance with the movement of the moving member; two transfer links wherein one end thereof is pin-connected to the other end of the drive links, and scissor blades are formed on the other end side thereof; and a fixed shaft pin-connected at a position at which the two transfer links cross in an X-shape, having an axial line perpendicularly crossing the straight line of the driveshaft, and having a fixed position. The two drive links and the two transfer links make up a four-bar link to convert a rotary motion of the driveshaft into a line motion in which the drive links change the position at which the scissor blades of the transfer links cross.

Description

Electric Scissors {ELECTRIC SCISSORS}

The present invention relates to electric scissors, and more particularly, to electric scissors that perform a cutting operation by moving a blade of the scissors using a driving force of a motor.

In general, scissors are tools used for cutting things, and are provided with two blades, and cut objects by crossing two blades while an object to be cut is located between them.

These scissors are used in various fields, and are used for fruit tree harvesting, plucking, fruit tree cultivation, pruning, etc. at agricultural sites, and for post-treatment cutting work in the injection process such as rubber or plastic at industrial sites, and for PCB of electronic products. A knife or scissors are also used to remove protrusions for post-soldering processing.

The cutting operation using scissors performed in the field is repeated dozens of times, as many as hundreds or thousands of times a day, and in order to reduce the efficiency of the cutting operation and the fatigue of the operator, cutting with the power of the machine is performed. Electric scissors are being developed.

An electric motor is used as a driving device of electric scissors that performs a cutting operation with the power of a driving device using electricity. However, since the electric motor is a device that generates rotational motion, it is different from the operation of scissors that cross two blades, and a technical configuration for changing the rotational motion of the motor into linear motion is required. In order to change the rotation of the motor into the linear motion of the scissors blade, conventional electric scissors mainly use a bevel gear including two gears whose rotation axes intersect each other. The bevel gear has a simple structure and can convert the linear motion of the motor into the linear motion of the movable blade. There are problems that tend to arise. In addition, when a bevel gear is applied, since only one of the two blades constituting the scissors can be moved, the size and shape of the scissors blade is limited.

Korean registered patent 10-1166700

An object of the present invention is to provide electric scissors having a new power transmission structure in which the loss of driving force of a driving motor is reduced as to solve the above-described problems of the prior art.

Electric scissors according to the present invention for achieving the above object, a drive motor for generating a rotational force using electricity; a drive shaft rotated by receiving the rotational force of the drive motor and having a screw thread formed thereon; a moving member fastened to the screw thread of the driving shaft and moving according to the rotation of the driving shaft; two drive links, one end of which is pin-connected to the movable member and whose position is changed according to the movement of the movable member; Two transmission links, one end of which is pin-connected to the other end of the drive link, and a gawit blade is formed on the other end side; and a fixed shaft pin-connected at a position where the two transmission links intersect in an X shape, perpendicularly crossing a straight line and an axis line of the driving shaft, and having a fixed position, wherein the two driving links and the two transmission links are fixed. The link constitutes a four-section link, characterized in that the drive link converts the rotational motion of the drive shaft into a linear motion that changes the position where the gawit blades of the transmission link intersect.

In the present invention, two driving links constitute a four-section link for two transmission links crossing in an X shape on a fixed shaft, so that two driving links pin-connected to a movable member moving according to the rotation of a driving shaft are By moving each transmission link, it is possible to provide a new type of power transmission structure in which two gawit blades move simultaneously.

At this time, it is preferable that the four-section link composed of the two driving links and the two transmission links has a concave quadrangular structure in which an interior angle between the two driving links is 180° or more. In this structure, as the movable member moves away from the fixed axis, the first gawit blade and the second gawit blade are opened, and as the movable member moves closer to the fixed axis, the first gawit blade and the second gawit blade may be closed.

When the 4-section link has a general rectangular structure, the distance between the movable member from the fixed axis increases, which means that the overall size of the electric scissors increases. Therefore, when a concave rectangular structure in which two drive links connected to the movable member are concave inward is applied, the overall size of the electric scissors can be reduced by reducing the distance between the movable members from the fixed shaft.

A gear unit may be added between the drive motor and the drive shaft.

The drive shaft may further include a drive base coupled to the fixed shaft to fix positions of the drive shaft and the fixed shaft. A driving PCB including a control unit for controlling the electric scissors may be installed, and the driving PCB may have a structure coupled to one side of the driving base.

It is preferable that a driving PCB including a control unit for controlling the electric scissors is installed, and the control unit can boost electricity applied to the driving motor.

In the present invention configured as described above, two driving links constitute a four-section link for two transmission links crossing in an X shape on a fixed shaft, so that two pins connected to a movable member moving according to the rotation of the drive shaft There is an effect of providing a new type of power transmission structure in which the two driving links move each of the two transmission links so that the two gawit blades move simultaneously.

In addition, since the movable member is fastened to the screw thread of the drive shaft, torque is transmitted in a surface contact state in which the entire inner surface of the movable member is in contact, so that a high torque can be transmitted even with a relatively small screw pitch.

Furthermore, as the movable member makes surface contact with the drive shaft, compared to the case where a conventional bevel gear is applied, not only can the entire part be simplified, but also it can be configured with a small circular shaft, so the overall weight of the electric scissors can be reduced. there is.

In addition, when a four-section link composed of two driving links and two transmission links is applied in a concave rectangular structure, the overall size of the electric scissors can be reduced by reducing the distance between the moving members from the fixed axis.

A gear unit may be added between the drive motor and the drive shaft.

The drive shaft may further include a drive base coupled to the fixed shaft to fix positions of the drive shaft and the fixed shaft.

A control unit for boosting the electricity applied to the driving motor may be further included.

1 is a perspective view and an exploded perspective view for explaining the structure of an electric scissors according to a first embodiment of the present invention.
2 is an exploded perspective view for explaining the structure of a driving unit according to an embodiment of the present invention.
Figure 3 is a cross-sectional view for explaining the coupled structure of the electric scissors according to the first embodiment of the present invention.
4 is a schematic diagram for explaining a link connection structure and operation included in a driving unit according to an embodiment of the present invention.
5 and 6 are views for explaining the operating state of the electric scissors according to the first embodiment of the present invention.
7 is a perspective view and an exploded perspective view for explaining the structure of an electric scissors according to a second embodiment of the present invention.
8 is a cross-sectional view for explaining the combined structure of the electric scissors according to the second embodiment of the present invention.
9 is a view for explaining the operating state of the electric scissors according to the second embodiment of the present invention.

An embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified in many different forms, and the scope of the present invention is not limited only to the embodiments described below. The shapes and sizes of elements in the drawings may be exaggerated for clearer description, and elements indicated by the same reference numerals in the drawings are the same elements.

And throughout the specification, when a part is said to be “connected” to another part, this includes not only the case of being “directly connected” but also the case of being “electrically connected” with another element interposed therebetween. In addition, when a part "includes" or "includes" a certain component, it means that it may further include or include other components, not excluding other components unless otherwise specified. .

In addition, terms such as "first" and "second" are used to distinguish one component from another, and the scope of rights should not be limited by these terms. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element.

1 is a perspective view and an exploded perspective view for explaining the structure of an electric scissors according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view for explaining the structure of a drive unit, and FIG. 3 is a first embodiment of the present invention It is a cross-sectional view for explaining the combined structure of the electric scissors according to. Figure 4 is a schematic diagram for explaining the link connection structure and operation included in the drive unit according to an embodiment of the present invention, Figures 5 and 6 are for explaining the operating state of the electric scissors according to the first embodiment of the present invention it is a drawing

In the electric scissors of this embodiment, various parts including the driving unit 100 are installed inside the housings 201 and 202 .

The housings 201 and 202 have a structure in which the left housing 201 and the right housing 202 divided into two are coupled. In this structure, the product can be assembled by placing the parts inside the housings 201 and 202 in a state where the housings 201 and 202 are separated, and then combining the left housing 201 and the right housing 202. . The outer shape of the housings 201 and 202 is not particularly limited, but it is preferable to form a grip part for the user to hold the electric scissors in his hand.

Among components installed together with the drive unit 100 inside the housings 201 and 202, there is a drive PCB 301, a push switch 302, and an operation switch 303.

The drive PCB 301 is a printed circuit board (PCB) equipped with a control unit for controlling the electric scissors of the present embodiment to operate, and the push switch 302 and the operation switch 303 are used by the user to control the electric scissors. It is a configuration for manipulating. The user can easily operate the device through the trigger-type push switch 302 , and the push switch 302 transfers the user's operation to the operation switch 303 . The operation switch 303 is connected to the driving PCB 301 to control the operation of the electric scissors. Configurations of the drive PCB 301, the push switch 302, and the operation switch 303 are not particularly limited, and all possible configurations can be applied within a range that does not impair the characteristics of the present invention. At this time, the drive PCB 301 may further include a component for boosting electricity supplied to the drive motor in order to increase torque and/or rotational speed of the drive motor.

Among components installed together with the drive unit 100 inside the housings 201 and 202, a battery 401 for supplying power to the drive unit 100 may be built in. Considering the usability of electric scissors, it is preferable to embed a battery 401 rather than receiving an external power supply by wire. At this time, the battery 401 may be a normal primary battery (normal battery) or a normal secondary battery capable of repeating charging and discharging. In the case of using a secondary battery as the battery 401, it is preferable to add a configuration for charging the battery 401. A power switch 501 capable of controlling power supply and cutoff may be provided, a charging jack 502 for connection with an external power source, and a power terminal PCB 503 and a cap 504 may be installed. can As components for charging the battery 401, any technology may be applied within a range that does not impair the characteristics of the present invention, and in particular, a USB-C type port used for charging a smartphone may be applied.

As shown in FIG. 2, the drive unit 100 of the present invention includes a drive motor 110, a drive shaft 120, a moving member 130, a first drive link 140, a second drive link 150, It includes a first transmission link 160, a second transmission link 170 and a fixed shaft 180.

The drive motor 110 receives electricity from the battery 401 to generate rotational force. The rotational force of the drive motor 110 is transmitted to the drive shaft 120 having threads formed on at least a portion of the surface thereof, thereby rotating the drive shaft 120 . At this time, although the drive motor 110 and the drive shaft 120 may be directly connected, a gear unit 112 may be added as in the present embodiment, and the gear unit 112 is the torque generated by the drive motor 110. And / or by controlling the rotational speed is transmitted to the drive shaft (120). The gear unit 112 may have various configurations depending on the purpose, and is not particularly limited, so detailed description thereof will be omitted.

The drive shaft 120 is a component that rotates by receiving the rotational force of the drive motor 110, and the movable member 130 is fastened to a screw thread formed on at least a part of the drive shaft 120.

Since the movable member 130 is screwed to the drive shaft 120, it can move in position according to the rotation of the drive shaft 120. The linear movement distance of the movable member 130 according to the rotation of the drive shaft 120 varies according to the pitch of the threads formed on the drive shaft 120 and the movable member 130, and the pitch varies according to the purpose of use of the electric scissors. can be adjusted accordingly. In this way, since the entire inner circumferential surface of the moving member 130 is fastened to the drive shaft 120, since the process of transmitting the rotational force of the drive motor 110 is performed in surface contact, conventional bevel gears and the like are only part of the gear. There is an excellent effect of transmitting torque with a wider contact area compared to the line contact.

The first driving link 140 and the second driving link 150 are pin-connected to the moving member 130 by a moving shaft 132 . Since one end of the first drive link 140 and the second drive link 150 is pin-connected to the movable member 130, when the movable member 130 moves along the drive shaft 120, the first drive link 140 As the angle between ) and the second driving link 150 is changed, the first driving link 140 and the second driving link 150 also move.

The first drive link 140 and the second drive link 150 transmit the rotational force of the drive shaft 120 to the first transmission link 160 and the second transmission link 170, and for this purpose, one end is a moving member ( 130 is pinned to the moving shaft 132, and the other end is pin-connected to the first transmission link 160 and the second transmission link 170, respectively.

The first transmission link 160 and the second transmission link 170 are positioned to cross each other in an X shape, and one end of each is attached to the first driving link 140 and the second driving link 150 with a first rivet ( 142) and the second rivet 152 are pin-connected. The position where the first transmission link 160 and the second transmission link 170 cross in the shape of an X is connected by a pin to a fixed shaft 180, and the first transmission link 160 and the second transmission link 170 The other side is formed with a first gawit blade 162 and a second gawit blade 172, respectively.

The fixed shaft 180 pin-connects the first transmission link 160 and the second transmission link 170 at the position where the first transmission link 160 and the second transmission link 170 intersect in an X shape, The axis line of the fixed shaft 180 vertically intersects the straight line of the driving shaft 120, and unlike the moving shaft 132, the position is fixed.

As described above, the first drive link 140, the second drive link 150, the first transmission link 160 and the second transmission link 170 constitute a pin-connected 4-bar link, and the drive shaft ( When the movable member 130 moves according to the rotation of 120), the strength of the first transmission link 160 and the second transmission link 170 crossed in an X shape changes while the first razor blade 162 and the second The position where the gawit blade 172 intersects is changed.

At this time, if the connection form of the 4-section link is a general rectangle with all interior angles less than 180 °, the first and second upper blades are closed as the moving member moves away from the fixed axis, and the moving member gets closer to the fixed axis. The 1st gait and the 2nd gait are open. However, there is a problem that the length of the device is too long when the moving member secures a distance to move until the first gawit blade and the second gawit blade are completely closed.

In this embodiment, in order to prevent the length of the device from being too long, as shown in FIG. A 4-section link was constructed in a concave quadrangular structure. In this structure, when the movable member 130 moves in a direction closer to the fixed shaft 180 along the drive shaft indicated by the dotted line, the pin-connected first transmission link 160 and the second transmission link 170 are fixed to the fixed shaft. (180) rotates inwardly, and finally, the first gawit blade 162 and the second gawit blade 172 located on the opposite side of the fixed shaft 180 are closed. Conversely, when the movable member 130 along the drive shaft moves in a direction away from the fixed shaft 180, the first gawit blade 162 and the second gawit blade 172 are opened, compared to the structure of the general rectangle described above. has the effect of shortening the overall length of

The electric scissors of this embodiment used a driving base 190 to align the positions of the driving shaft 120 and the fixed shaft 180. The driving base 190 includes a shaft connecting hole 192 for fixing the drive shaft 120 and a fixing shaft connecting hole 194 for fixing the fixed shaft 180 . The shaft connecting hole 192 faces each other and has two light through holes, and the fixed shaft 180 is fixed to the fixed shaft connecting hole 194 of the drive base 190 with a nut 182. In this embodiment, the driving PCB 301 is fixed to one side of the driving base 190. If the structure can accurately align the positions of the drive shaft 120 and the fixed shaft 180, the shape of the drive base 190 can be modified in various ways, and it is also possible to fix it to the housing without adding a separate drive base. possible.

As described above, the electric scissors of the present invention performs a cutting operation by moving the first transmission link 160 and the second transmission link 170 with rotation by one drive motor 100, which is a human hand. It is like moving a pair of scissors with This is different from the conventional electric scissors in which only one blade is moved and the other blade is fixed. When only one of the two intersecting blades is moved, the direction of the force applied in the cutting operation is unbalanced, resulting in low cutting efficiency and a problem of not fixing the object during the cutting process. In order to solve this problem, conventional electric scissors have a problem in that the versatility of the gawit blade is poor because the shape of the gawit blade is configured in a specific curved shape. In contrast, in the electric scissors of the present invention, since the two blades move symmetrically together, the force applied in the cutting operation is balanced, and the shape of the scissors blade is not limited and can be configured in various forms, and the straight blade can also be configured. In addition, since both gawit blades only need to have the same shape, versatility is high and the gawit blade can be configured as a replacement type.

In addition, the electric scissors of the present invention can simplify all parts through a configuration that transmits the rotational force of the drive motor 110 to the drive shaft 120. Compared to the existing structure that used a plurality of gears to change rotational motion into linear motion, the configuration of the present invention can be configured with a small circular shaft, and since all parts are simplified, it is possible to reduce the weight compared to existing products. .

Figure 7 is a perspective view and an exploded perspective view for explaining the structure of the electric scissors according to the second embodiment of the present invention, Figure 8 is a cross-sectional view, Figure 9 is an operating state of the electric scissors according to the second embodiment of the present invention It is a drawing for explanation.

As shown, the electric scissors according to the second embodiment of the present invention have the same configuration as the first embodiment, and differ only in appearance and arrangement of components.

The description of the same parts as the first embodiment is omitted, and the differences are as follows.

First, there is a difference from the first embodiment in the arrangement direction of the driving unit 100. The first embodiment had a structure in which the fixed shaft was arranged in a direction horizontal to the ground and the razor blade moved up and down to open and close, but in the second embodiment, the fixed shaft was arranged in a direction perpendicular to the ground and the razor blade moved in the left and right directions It is an open and closed structure.

And there is a difference from the first embodiment in the position of the grip part and the battery 401. Unlike the first embodiment, in the second embodiment, the grip part is formed in the shape of a pistol with respect to the housings 201 and 202, and the battery 401 is placed in the grip part in the shape of a pistol.

In addition, it can be modified and implemented in various forms within a range that does not impair the characteristics of the present invention.

The present invention has been described above through preferred embodiments, but the above-described embodiments are only illustrative of the technical idea of the present invention, and various changes are possible within a range that does not depart from the technical idea of the present invention. Anyone with ordinary knowledge will be able to understand. Therefore, the protection scope of the present invention should be construed by the matters described in the claims, not the specific examples, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: drive unit 110: drive motor
112: gear unit 120: drive shaft
130: moving member 132: moving shaft
140: first driving link 142: first rivet
150: second drive link 152: second rivet
160: first transmission link 162: first gawit blade
170: second transmission link 172: second scissors blade
180: fixed axis 190: driving base
201, 202: housing 301: driving PCB
302: push switch 303: operation switch
401: battery 501: power switch
502: charging jack 503: power terminal PCB
504: cap

Claims (7)

A drive motor that generates rotational force using electricity;
a drive shaft rotated by receiving the rotational force of the drive motor and having a screw thread formed thereon;
a moving member fastened to the screw thread of the driving shaft and moving according to the rotation of the driving shaft;
two drive links, one end of which is pin-connected to the movable member and whose position is changed according to the movement of the movable member;
Two transmission links, one end of which is pin-connected to the other end of the drive link, and a gawit blade is formed on the other end side; and
A fixed shaft is pinned at a position where the two transmission links intersect in an X shape, a straight line and an axis line of the drive shaft vertically intersect, and the position is fixed,
The two drive links and the two transmission links constitute a four-section link, and the rotational motion of the drive shaft is converted into a linear motion for changing the position where the gawit blades of the transmission link intersect. Electric scissors to do.
The method of claim 1,
The electric scissors, characterized in that the four-section link composed of the two driving links and the two transmission links has a concave quadrangular structure in which an internal angle between the two driving links is 180 ° or more.
The method of claim 2,
Electric scissors, characterized in that the structure in which the first razor blade and the second razor blade open as the movable member moves away from the fixed axis, and the first razor blade and the second razor blade close as the movable member moves closer to the fixed axis.
The method of claim 1,
Powered scissors, characterized in that the gear portion is added between the drive motor and the drive shaft.
The method of claim 1,
Electric scissors characterized in that it further comprises a drive base coupled to the drive shaft and the fixed shaft, fixing the position of the drive shaft and the fixed shaft.
The method of claim 5,
It includes a drive PCB in which a control unit for controlling the electric scissors is installed,
Electric scissors, characterized in that the driving PCB is coupled to one side of the driving base.
The method of claim 1,
It includes a drive PCB in which a control unit for controlling the electric scissors is installed,
Electric scissors, characterized in that the controller can boost the electricity applied to the drive motor.

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