JP2005224122A - Electric shears - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electric shears used for tree pruning, gardening work, or the like, so designed as to increase shearing force of a blade body, make an open angle of the blade body changeable, be improved in its workability and operability, reduce the size and weight of the shears body of the shears, and facilitate replacement of the blade body. <P>SOLUTION: The shears have the following structure: the shears body 1 is provided with the blade body 2 freely detachable; the blade body 2 is provided with a fixed blade 4 and a movable blade 5 which are openably and rotationally pivotted via a pivotally supporting part 3; the movable blade 5 is provided with a power transmission part 9; the shears body 1 is provided with a power transmission mechanism 14 transmitting power of a driving device 12 to the power transmission part 9; the power transmission mechanism 14 comprises a bevel wheel power transmission part 15, a spur wheel power transmission part 16 and a cam power transmission part 17; the bevel wheel power transmission part 15 comprises a small bevel wheel 18, and a large bevel wheel 19 connected to the small bevel wheel 18 via gearing; the spur wheel power transmission part 16 comprises a small spur wheel 20 rotating integrally to the large bevel wheel 19, and a fan-shaped wheel 21 connected to the small spur wheel 20 via gearing; and the cam power transmission part 17 comprises a cam follower 26 set to the fan-shaped wheel 21, and a cam groove 27 formed at the power transmission part 9 so as to be engaged to a cam follower. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to electric scissors used for tree pruning, horticultural work, and the like.

2. Description of the Related Art Conventionally, a main body and a blade body that can be attached to and detached from the main body have been provided, and the blade body has a fixed blade and a movable blade that are pivotably attached to each other via a pivotal support portion, and the fixed blade has the pivot. One of the support blades is detachably attached to the main body and the other is a blade portion, and the movable blade is one of the power support portions via the pivot support portion and the other is a blade portion, A drive device that transmits power to the power transmission unit is provided in the main body, and the drive device has a known electric scissor including a motor and a transmission mechanism that transmits power of the motor to the power transmission unit (for example, , Patent Document 1, Patent Document 2, etc.).
Japanese Unexamined Patent Publication No. Sho 63-317181 JP-A-11-128561

Although the thing of the said patent document 1 comprised what comprised the said transmission mechanism in 2 steps | paragraphs of the bevel gear transmission part and the cam transmission part, this had the fault that the shear force of a blade body was insufficient.
Moreover, although the thing of patent document 2 is comprised in three steps of the planetary gear reduction part, the bevel gear transmission part, and the spur gear transmission part, the shearing force is raised, but adjustment of the opening angle of a movable blade is carried out. Since a variable resistor linked to the movement of the movable blade and the movement of the trigger lever is used, the structure is complicated, and there is a drawback that the blade body is not easily polished or replaced.
The present invention has been developed to improve the above-mentioned drawbacks of conventional electric scissors.

The present invention has a main body and a blade that is detachable from the main body. The blade body includes a fixed blade and a movable blade that are pivotally attached to each other via a pivotal support. One of the fixed blades via the pivot portion is an attachment portion that is detachably attached to the main body, and the other is a blade portion. One of the movable blades via the pivot portion is a power transmission portion and the other is a blade portion. The main body is provided with a drive device that transmits power to the power transmission unit. The drive device includes a motor and a transmission mechanism that transmits the power of the motor to the power transmission unit.
The transmission mechanism includes a bevel gear transmission, a spur gear transmission, and a cam transmission.

The bevel gear transmission unit includes a small bevel gear on the motor side and a large bevel gear meshed with the small bevel gear.
The spur gear transmission portion is composed of a small spur gear provided so as to rotate integrally with the large bevel gear and a large spur gear meshed with the small spur gear.
The cam transmission portion is provided between the large spur gear and the power transmission portion. The fixed blade and the movable blade can be integrally attached to and detached from the main body by an attachment member of the fixed blade to the main body. Has been.

The large spur gear is formed by a sector gear having a spur gear formed in about a half circumference and having concave portions on both sides of the spur gear forming range to avoid interference with the pivotal support portion of the blade body.
The cam transmission part is composed of a cam follower provided in one of the large spur gear and the power transmission part and a cam groove provided in the other to be engaged with the cam follower.
The main body is provided with an open position detecting means for detecting the open position of the movable blade and stopping the motor, and a closed position detecting means for detecting the closed position and stopping the motor.
The open position detecting means is provided so that the open position of the movable blade can be changed.

The main body is provided with a control device for operating a trigger lever and a motor of the driving device, and the control device is operated by the trigger lever.
The control device closes the movable blade when the trigger lever is pressed, opens the movable blade when the trigger lever is released, and moves the trigger lever to an intermediate position between the press operation and the release operation. When held, the movable blade is configured to stop halfway.
The control device includes a mode changeover switch that switches between an interlocking mode in which the movable blade is continuously opened and closed by a pressing operation of the trigger lever and a single-action mode in which the movable blade is opened and closed only once.

In addition, a box that houses a battery serving as a power source for the motor and a control device that controls the motor is provided separately from the main body, and the box and the main body are connected by an electric cable.
The box is equipped with a shoulder band or a waist band and is portable.

  According to the present invention, since the transmission mechanism is constituted by the bevel gear transmission portion, the spur gear transmission portion, and the cam transmission portion, the output of the motor is increased in three stages, and the shearing force of the blade body is increased to increase the thickness. Branch cutting may be possible. In addition, the opening angle of the blade body can be easily changed with a simple structure. Further, it is possible to improve the work efficiency by reducing the useless movement of the movable blade. In addition, the polishing of the blade body at the work site can be facilitated. Further, replacement and replacement of the blade body can be facilitated. Moreover, the power transmission part of the movable blade is shortened to reduce the behavior space, and the main body is reduced in size and weight. In addition, the operability and handleability of the electric scissors can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the electric scissors of the present invention.
As shown in FIGS. 1 to 3, the electric scissors of the present invention have a main body 1 and a blade body 2 detachably attached to the main body 1, and the blade body 2 can be freely opened and closed via a pivotal support portion 3. A fixed blade 4 and a movable blade 5 are pivotally attached. The main body 1 is configured so as to be divided into two in the front and back direction in FIG. 1 and is fastened at a plurality of locations by bolts 6. In this embodiment, the pivotal support portion 3 is exemplified by a case in which the blade body 2 is constituted by a threaded pin and a nut that are separate from the blade body 2. However, the present invention is not limited to this. For example, a convex portion serving as a pivot is integrally provided on one blade body, and a shaft hole is formed on the other blade body, and these may be combined and nut-fastened. .

One of the fixed blades 4 via the pivot portion 3 is an attachment portion 7 that is detachably attached to the main body 1, and the other is a blade portion 8. One of the movable blades 5 through the pivot support portion 3 is a power transmission portion 9 and the other is a blade portion 10.
The fixed blade 4 and the movable blade 5 can be integrally attached to and detached from the main body 1 by an attachment member 11 of the fixed blade 4 to the main body 1. The attachment member 11 is composed of two bolts, and can be directly attached and detached from the outside of the main body 1.
The main body 1 is provided with a driving device 12 that transmits power to the power transmission unit 9. The drive device 12 includes a motor 13 and a transmission mechanism 14 that transmits the power of the motor 13 to the power transmission unit 9.

The transmission mechanism 14 includes a bevel gear transmission unit 15, a spur gear transmission unit 16, and a cam transmission unit 17.
The bevel gear transmission unit 15 includes a small bevel gear 18 on the motor 13 side and a large bevel gear 19 meshed with the small bevel gear 18. In this embodiment, the bevel gear transmission unit 5 employs a bevel gear having a large power transmission efficiency, but may be a bevel gear.
The spur gear transmission portion 16 is constituted by a small spur gear 20 provided so as to rotate integrally with the large bevel gear 19 and a large spur gear 21 meshingly connected to the small spur gear 20. The large bevel gear 19 and the small spur gear 20 are fixed to the same shaft 22. The shaft 22 is supported by the main body 1 so as to be rotatable.

In the present embodiment, the large spur gear 21 is formed of a sector gear having a spur gear 23 formed in about a half circumference and having concave portions 24 on both sides of the spur gear 23 forming range to avoid interference with the pivotal support portion 3. doing. The sector gear 21 is rotatably supported by a pivot 25 that is cantilevered by the main body 1. The pivot 25 is disposed close to the pivot 3 to house the entire transmission mechanism 14 in the main body 1 in a compact manner. However, if the head portion of the pivot portion 3 is thin, an annular spur gear in which spur gears are formed on the entire periphery may be used instead of the sector gear 21.
The cam transmission portion 17 includes a cam follower 26 provided between the large spur gear (fan gear) 21 and the power transmission portion 9 and a cam groove 27 that engages with the cam follower 26.

  The distance from the center of the pivot 25 to the cam follower 26, that is, the radius of rotation of the cam follower 26, and the distance from the center of the pivot 3 of the movable blade 5 to the contact point between the cam groove 27 and the cam follower 26, that is, to the movable blade 5. When compared with the power transmission radius, the latter is configured to be always larger than the former. The depth of the cam groove 27 is approximately the same as the rotation radius of the cam follower 26, thereby reducing the rotation radius of the power transmission unit 9 of the movable blade 5 and reducing the behavior space in the main body 1. We are trying to reduce it. Correspondingly, the transmission mechanism 14 is designed so that the large spur gear (fan gear) 21 rotates in the clockwise direction and the counterclockwise direction within a range of half rotation or less. In addition, the initial position of the cam follower 26 is set so that the power transmission radius of the movable blade 5 is minimized and then minimized again from the maximum open position to the closed position of the movable blade 5.

  For this purpose, the shaft 22 of the large bevel gear 19 and the pivot shaft 25 of the large spur gear (fan gear) 21 are arranged substantially in line with the pivot portion 3 of the movable blade 5, and each axis of these three axes is the main body 1. It arrange | positions so that it may become a right angle to the 2 division | segmentation surface. Further, in the present embodiment, the three axes are illustrated as being arranged on a substantially straight line on an extension line of the axis of the driving device 12, but the present invention is not limited to this. For example, the axis of the driving device 12 is appropriately rotated around the shaft 22 as a central axis with respect to the arrangement of the pivot 25 and the pivot 3 of the movable blade 5, and is bent into a square shape to form a so-called pistol arrangement. Also good. Even if it arrange | positions in this way, power transmission efficiency and a function do not change and are the same.

As shown in FIGS. 1 and 2, the main body 1 detects an open position of the movable blade 5 to stop the motor 13 and an open position detecting means 28 for stopping the motor 13 to stop the motor 13. Closed position detecting means 29 is provided. Both detection means 28 and 29 may be either contact type or non-contact type sensors.
The open position detecting means 28 is provided so that the open position of the movable blade 5 can be changed. In this embodiment, as shown in FIG. 4, a cloud-shaped dog 30 is provided in the large spur gear (fan gear) 21, and a long hole 34 that intersects the inner diameter side arc surface 31 of the dog 30 is provided in the main body 1. The open position of the movable blade 5 can be changed steplessly by moving the open position detecting means 28 to an arbitrary position within the long hole 34 and fixing the open position detecting means 28 with a fixing means such as a screw at that position. The case is illustrated. In this case, the arcuate surface 31 on the inner diameter side of the dog 30 is configured such that the distance from the center of the pivot shaft 25 of the large spur gear (fan gear) 21 gradually increases (or decreases) in the rotation direction of the large spur gear (fan gear) 21. Is formed. The closed position detecting means 29 is fixedly installed at a position corresponding to the cam follower 26 provided in the large spur gear (fan gear) 21 at the closed position of the movable blade 5.

As shown in FIG. 5, a control device 35 that operates the motor 13 of the driving device 12 is connected to the main body 1. The control device 35 is operated by a trigger lever 36 installed in the main body 1. The trigger lever 36 is pivotally supported by the main body 1 by a pin 37 and can be returned to an inoperative position by a return spring (not shown).
When the trigger lever 36 is pressed, the control device 35 closes the movable blade 5, and when the trigger lever 36 is released, the control device 35 opens the movable blade 5, and the trigger lever 36 is pressed. When held at the intermediate position of the release operation, the movable blade 5 is configured to stop halfway. Specifically, the main body 1 is provided with a start switch 38 and a return switch 39 that are turned on and off in reverse relation to each other by pressing and releasing the trigger lever 36. As shown in FIG. 5, these switches 38 and 39 are connected to a central information processing device 40 in the control device 35, and control the driving of the motor 13 via a forward rotation relay 41 and a reverse rotation relay 42.

The control device 35 includes a mode changeover switch 43 for switching between an interlocking mode in which the movable blade 5 is continuously opened and closed by pressing the trigger lever 36 and a single-action mode in which the movable blade 5 is opened and closed only once. Have.
The motor 13 is connected in parallel to the battery 44 via a forward relay 41 and a reverse relay 42, and a main switch 45 is inserted and connected in the middle.
The forward rotation relay 41 is turned on via the central information processing device 40 by the switch 38 that is turned on by the pressing operation of the trigger lever 36, and the motor 13 is supplied with current in the forward direction from the battery 45, so that the motor 13 is turned on. Turn forward.

The reverse relay 42 is turned on via the central information processing device 40 by the switch 39 that is turned on by the release operation of the trigger lever 36, and causes the motor 13 to supply current in the reverse direction from the battery 44 to reversely rotate the motor 13. Let
Due to the rotation of the motor 13 in the forward rotation direction, the movable blade 5 rotates in the closing direction from the driving device 12 in the main body 1 via the transmission mechanism 14, and when the closing position is reached, the closed position detecting means 29 is turned on. Then, the forward rotation relay 41 is turned off via the central information processing apparatus 40 to stop energization of the battery 44 supplied to the DC motor 13 and the motor 13 is stopped. Therefore, the movable blade 5 is closed position detecting means. It stops at the closed position where 29 is installed.

Further, when the motor 13 rotates in the reverse direction, the movable blade 5 rotates in the opening direction from the driving device 12 in the main body 1 via the transmission mechanism 14, and when the opening position is reached, the opening position detecting means 28 is turned on. The movable blade 5 detects the open position because it operates to turn off the reverse relay 42 via the central information processing apparatus 40 to stop energization of the battery 45 supplied to the motor 13 and the motor 13 stops. It stops at the open position where the means 28 is installed.
A mode selector switch 43 is connected to the central information processing apparatus 40. When the mode selector switch 43 is switched to the single action mode, when the trigger lever 36 is pressed, the forward relay 41 is turned on by the switch 38 and the motor 13 is operated. Is operated in the forward direction to move the movable blade 5 in the closing direction, and the forward position relay means 41 is turned off by the closed position detecting means 29 at the closed position to stop energization of the motor 13. When the pressing operation of the trigger lever 36 is released, the reverse relay 42 is turned on by the switch 39 to reversely rotate the motor 13 and rotate the movable blade 5 in the opening direction. When the opening position is reached, the opening position is detected. The reverse relay 42 is turned off by the means 28 and the energization to the motor 13 is stopped.

  On the other hand, when the mode changeover switch 43 is switched to the interlock mode, when the trigger lever 36 is pressed, the forward rotation relay 41 is turned ON by the switch 38 and the motor 13 is operated in the forward rotation direction to move the movable blade 5. Operate in the closing direction. Then, the forward rotation relay 41 is turned OFF by the closed position detecting means 29 at the closed position of the movable blade 5 and simultaneously the reverse rotation relay 42 is turned ON to rotate the motor 13 in the reverse rotation direction. As a result, the movable blade 5 immediately rotates in the opening direction, and when the movable blade 5 reaches the open position, the open position detecting means 28 is turned on. As a result, the reverse rotation relay 42 is turned OFF and the motor 13 stops the reverse rotation. At the same time, the forward rotation relay 41 is turned on, and the motor 13 is immediately rotated in the forward direction to rotate the movable blade 5 in the closing direction. The interlocking mode is configured to continuously repeat the above operation while continuing to press the trigger lever 36. However, when the pressing operation of the trigger lever 36 is released, the switch 38 is turned off, and the switch 39 that has been in the off state is turned on. However, the switches 38 and 39 are instantaneously turned on during this slight time difference. Simultaneously OFF state. As a result, regardless of the position and state of the movable blade 5 within the open / close operation range, both relays 41 and 42 are turned OFF and the energization of the motor 13 is stopped. Immediately thereafter, the switch 39 is turned on, so that the reverse rotation relay 42 is turned on, the motor 13 starts to rotate in the reverse direction, and the movable blade 5 is rotated toward the open position. When the movable blade 5 reaches the open position, the reverse rotation relay 42 is turned off by the open position detecting means 28 and the energization to the motor 13 is stopped. As a result, when the electric scissors of the present invention are used in the interlock mode, when the pressing operation of the trigger lever 36 is released, the operation is instantaneously stopped regardless of the position or state of the movable blade 5. Then, it is rotated toward the open position and stops at the open position.

  In FIG. 5, 46 is a voltage detector, 47 is an A / D converter, 48 is a power supply, 49 is a charge completion lamp, and 50 is a charge required lamp. The voltage detector 46 detects the voltage of the battery 44 supplied to the entire electric circuit, sends it to the central information processing device 40 through the A / D converter 47, and when the voltage drops below a predetermined value, The charge-required lamp 50 is lit red to notify, and when the voltage during charging of the battery 44 reaches a predetermined value, the charge completion lamp 49 is lit in green. The power supply 48 is for enabling the motor 13 to operate when the voltage supplied from the battery 44 is within a predetermined range that allows stable operation.

  The battery 44, the central information processing device 40, the forward relay 41, the reverse relay 42, the main switch 45, the mode switch 43, the voltage detector 46, the A / D converter 47, the power supply 48, and the charge completion lamp 49. The charge required lamp 50 is housed in a box (not shown) configured separately from the main body 1 as the control device 35, and the motor 13, the switches 38 and 39, the open position detecting means 28, and the closed position detecting means 29 are included in the main body. 1, the box and the main body 1 are connected by an electric cable, and the box is equipped with a shoulder band or a waist band (not shown) and is portable.

The embodiment of the electric scissors according to the present invention has the above configuration, and the operation will be described next.
When pruning a tree using the electric scissors of the present invention, first, the main switch 45 is turned on, and the mode changeover switch 43 is set to either the single action mode or the interlocking mode. Then, the box is carried on the shoulder of the operator or attached to the waist, the main body 1 is gripped with one hand, the tip of the main body 1 is approached toward the branch to be pruned, and the trigger lever 36 is pressed. Thereby, in FIG. 5, the return switch 39 is turned OFF, the start switch 38 is turned ON, the forward relay 41 is turned ON, and the motor 13 is rotated forward. Thereby, in FIG. 1, the small bevel gear 18 reduces the speed of the large bevel gear 19 in inverse proportion to the diameter difference, but the power is transmitted in proportion to the diameter difference. Further, the small spur gear 20 that rotates integrally with the large bevel gear 19 reduces the speed of the large spur gear (fan gear) 21 in inverse proportion to the diameter difference, but the power increases in proportion to the diameter difference and is transmitted. Further, although the cam follower 26 provided on the large spur gear (fan gear) 21 reduces the speed of the movable blade 5 through the cam groove 27 in inverse proportion to the diameter difference, the power is increased and transmitted in proportion to the diameter difference. Then, the movable blade 5 is rotated from the open position to the closed position. This is because the large spur gear (fan gear) 21 rotates in the clockwise direction within a half rotation or less, and the power transmission radius of the movable blade 5 is larger than the rotation radius of the cam follower 26. Moreover, the position of the cam follower 26 is set such that when the movable blade 5 rotates from the open position toward the closed position, the power transmission radius of the movable blade 5 gradually increases and then gradually decreases. As a result, the shear force gradually increases in the first half of the branch cutting process, and the shear force gradually decreases in the second half. As a result, according to the electric scissors of the present invention, the power can be increased and transmitted in three stages from the small bevel gear 18 toward the movable blade 5. Therefore, the shearing force of the blade body 2 is stronger than before, and a large branch can be easily cut.

  When the target branch has been cut, the movable blade 5 reaches the closed position. Here, when the single-action mode is set, the closed position detecting means 29 is turned on when the movable blade 5 rotates to the closed position even if the trigger lever 36 is continuously pressed. As a result, the forward rotation relay 41 is turned OFF, the energization of the motor 13 is stopped, and the movable blade 5 stops at the closed position. When the pressing operation of the trigger lever 36 is released, the start switch 38 is turned off, the return switch 39 is turned on, and the motor 13 is energized in the reverse direction via the reverse rotation relay 42. Accordingly, power in the reverse rotation direction is transmitted from the small bevel gear 18 to the large bevel gear 19, from the small spur gear 20 to the large spur gear (fan-shaped gear) 21, and from the cam follower 26 to the movable blade 5 via the cam groove 27. The Thereby, the movable blade 5 rotates from the closed position toward the open position. When the movable blade 5 reaches the open position, the energization of the motor 13 is stopped by the open position detecting means 28 and the movable blade 5 stops at the open position. In the single action mode, the above operation is repeated and the pruning of the branches is performed.

In the interlock mode, when the trigger lever 36 is continuously pressed, the movable blade 5 continuously opens and closes between the open position and the closed position. Therefore, in the interlocking mode, the pruning of branches can be performed continuously and efficiently. In this case as well, if the pressing operation of the trigger lever 36 is released, the movable blade 5 stops instantaneously, and then returns to the open position and waits for the next operation.
Note that once the trigger lever 36 is pressed, and when the pressing operation force is loosened and stopped at the intermediate position, the switches 38 and 39 are switched regardless of whether the mode selector switch 43 is switched to the single action mode or the interlocked mode. Are both turned off. As a result, the forward rotation relay 41 and the reverse rotation relay 42 are turned off through the central information processing device 40, and the energization of the motor 13 is stopped. Therefore, the movable blade 5 is stopped halfway within the opening / closing operation range. By utilizing this function, when pruning an adjacent branch successively after pruning a certain branch during pruning a tree, wasteful operation of the movable blade 5 can be eliminated and the pruning work efficiency can be improved.

  Moreover, if the pruning operation is continued for a long time, the sharpness gradually decreases due to the blunting of the blade body 2. In such a case, the electric scissors according to the present invention change the position of the open position detecting means 28 to a position where the opening angle of the movable blade 5 is larger than before, for example, the maximum opening angle position. 2 blunted portions can be unfolded and exposed. Thus, even if the blade body 2 is not removed from the main body 1, the blunted portion of the blade body 2 can be polished with the polishing tool to recover the sharpness. As a result, if the polishing tool is carried to the work site, the blade body 2 can be polished immediately, and the pruning operation can be continued immediately after completion.

Even when the blade body 2 is replaced and replaced, the electric scissors of the present invention can extract the fixed blade 4 and the movable blade 5 from the main body 1 by removing the mounting member 11 of the mounting portion 7 of the fixed blade 4. Can do. In this case, as shown in FIG. 2, by setting the movable blade 5 in the closed position, the blade body 2 can be easily extracted from the main body 1 and the main body 1 does not have to be disassembled. Then, the new blade body 2 is inserted into the main body 1 in the same manner, the cam groove 27 of the movable blade 5 is engaged with the cam follower 26, and the attachment portion 7 of the fixed blade 4 is attached to the main body 1 by the attachment member 11. .
The electric scissors in the embodiment of the present invention have the above-described configuration and operation. However, the present invention is not limited to this embodiment, and various modifications can be made within the scope of the claims. For example, the dog 30 may be provided on a part of the movable blade 5. Moreover, the change of the open position of the movable blade 5 may not be stepless. Furthermore, the relationship between the cam follower 26 and the cam groove 27 of the cam transmission portion 17 may be reversed from the embodiment. Moreover, the electric scissors of this invention are applicable to uses other than the pruning of trees, for example, industrial use etc., by changing the shape of the blade body 2.

The maximum open state of a movable blade is shown with the outline vertical side view of the electric scissors of this invention. The closed state of the movable blade is shown in the same drawing as FIG. Fig. 2 shows a cross-sectional plan view of the electric scissors of Fig. 1. The explanatory view of the installation relation of the dog installed in the sector gear is shown. Fig. 3 shows a control electric circuit diagram of the electric scissors of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 3 Pivoting part 4 Fixed blade 5 Movable blade 12 Drive apparatus 13 Motor 14 Transmission mechanism 15 Bevel gear transmission part 16 Spur gear transmission part 17 Cam transmission part 18 Small bevel gear 19 Large bevel gear 20 Small spur gear 21 Large spur gear (sector gear) )
26 Cam follower 27 Cam groove 28 Open position detection means 29 Closed position detection means 30 Dog 34 Long hole 35 Control device 36 Trigger lever 38 Start switch 39 Return switch 43 Mode changeover switch 44 Battery 45 Main switch

Claims (11)

A main body and a blade body detachably attached to the main body, the blade body including a fixed blade and a movable blade pivotably attached to each other via a pivot portion, and the fixed blade includes the pivot portion. One of the movable blades is detachably attached to the main body, the other is a blade portion, and the movable blade is a power transmission portion and the other is a blade portion via the pivotal support portion, Is provided with a drive device that transmits power to the power transmission unit, and the drive device includes a motor and a transmission mechanism that transmits power of the motor to the power transmission unit.
The transmission mechanism has a bevel gear transmission part, a spur gear transmission part, and a cam transmission part,
The bevel gear transmission is composed of a small bevel gear on the motor side and a large bevel gear meshed with the small bevel gear.
The spur gear transmission portion is composed of a small spur gear provided so as to rotate integrally with the large bevel gear and a large spur gear meshed with the small spur gear.
The electric scissors are characterized in that the cam transmission part is formed between the large spur gear and the power transmission part.   The electric scissors according to claim 1, wherein the fixed blade and the movable blade can be integrally attached to and detached from the main body by an attachment member of the fixed blade to the main body.   The large spur gear is formed of a sector gear having a spur gear formed in about a half circumference and having concave portions on both sides of the spur gear forming range to avoid interference with the pivotal support portion of the blade body. The electric scissors according to claim 1.   The cam transmission section includes a cam follower provided in one of the large spur gear and the power transmission section and a cam groove provided in the other to engage with the cam follower. The electric scissors according to 1. A main body and a blade body detachably attached to the main body, the blade body including a fixed blade and a movable blade pivotably attached to each other via a pivot portion, and the fixed blade includes the pivot portion. One of the movable blades is detachably attached to the main body, the other is a blade portion, and the movable blade is a power transmission portion and the other is a blade portion via the pivotal support portion, Is provided with a drive device that transmits power to the power transmission unit, and the drive device includes a motor and a transmission mechanism that transmits power of the motor to the power transmission unit.
The main body is provided with an open position detecting means for detecting the open position of the movable blade and stopping the motor, and a closed position detecting means for detecting the closed position and stopping the motor. Electric scissors to do.   6. The electric scissors according to claim 5, wherein the open position detecting means is provided so that the open position of the movable blade can be changed.   6. The electric scissors according to claim 5, wherein the main body is provided with a control device for operating a trigger lever and a motor of the driving device, and the control device is operated by the trigger lever.   The control device closes the movable blade when the trigger lever is pressed, opens the movable blade when the trigger lever is released, and moves the trigger lever to an intermediate position between the press operation and the release operation. The electric scissors according to claim 7, wherein the scissors are configured to stop the movable blade halfway when held.   The control device includes a mode changeover switch that switches between an interlocking mode in which the movable blade is continuously opened and closed by pressing the trigger lever and a single-action mode in which the movable blade is opened and closed only once. The electric scissors according to claim 7 or 8. A main body and a blade body detachably attached to the main body, the blade body including a fixed blade and a movable blade pivotably attached to each other via a pivot portion, and the fixed blade includes the pivot portion. One of the movable blades is detachably attached to the main body, the other is a blade portion, and the movable blade is a power transmission portion and the other is a blade portion via the pivotal support portion, Is provided with a drive device that transmits power to the power transmission unit, and the drive device includes a motor and a transmission mechanism that transmits power of the motor to the power transmission unit.
An electric scissor characterized by having a box for housing a battery serving as a power source for the motor and a control device for controlling the motor separately from the main body, and the box and the main body are connected by an electric cable. .   The power scissors according to claim 10, wherein the box is equipped with a shoulder band or a waist band and is portable.

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