JP2005052384A - Electric scissors - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electric scissors which minimize obstacles in the space surrounding the blades with a pair of blades opened. <P>SOLUTION: The electric scissors 1 are constituted of a lower blade 3 fixed on the tip of a body case 13, an upper blade 2 mounted on the lower blade 3 being turnable on the shaft 4, a rod 8 which is engaged with a working part 32 of the upper blade 2 through a link 5 to make the upper blade 2 move opened or closed freely and a control means which contains a motor 15 or the like and controls the advancement and retraction of the rod. The upper blade 2 is so formed as to make the working part 32 extend backward from the shaft 4 with the blade part 31 opened and can be moved in the direction of closing the blade part 31 with the advancing of the rod 8. Thus, with the blade part 31 opened, this keeps the working part 32 from protruding ahead of the shaft 4 to eliminate the obstacles in the operation even when a site to be cut of an object to be cut is complicated, thereby achieving a higher handleability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric rod, and more particularly to an electric rod that opens and closes a blade by forward and backward movement of a rod.

FIG. 8 is a partially cutaway view showing a schematic configuration of a tip portion of a conventional electric rod.
Referring to the drawing, the electric rod 51 includes a lower blade 53 fixed to a main body case 57 and an upper blade 52 that is rotatably attached via a shaft 54. The upper blade 52 is driven by power. It is used for applications such as pruning tree branches by opening and closing. The upper blade 52 includes a blade portion 58 that extends forward from the shaft 54 and an operating portion 59 that is connected to the blade portion 58 and extends in a direction substantially orthogonal to the blade portion 58. The end portion 60 of the operating portion 59 is connected to a rod 56 that can be moved back and forth by a driving means (not shown) such as a motor and the like via a shaft 55.

  When cutting an object to be cut such as a branch with the electric rod 51, as shown by the solid line in the figure, the blade portion 58 of the upper blade 52 and the lower blade 53 with the upper blade 52 opened with respect to the lower blade 53. The electric scissors 51 are arranged so that the object to be cut is sandwiched therebetween. When the switch 56 (not shown) is operated to move the rod 56 from the position indicated by the solid line to the position indicated by the two-dot chain line behind by the power, the operating portion 59 of the upper blade 52 and the rod 56 are connected. Therefore, the upper blade 52 moves in a closing direction around the shaft 54 as the rod 56 moves backward. Then, as shown by a two-dot chain line, the workpiece is cut while moving until the upper blade 52 is closed with respect to the lower blade 53.

  As described above, in the conventional electric scissors 51, the operation part 59 of the upper blade 52 is pulled rearward to move the upper blade 52 in the closing direction with respect to the lower blade 53, thereby cutting the object to be cut. It is configured as follows.

FIG. 9 is a diagram showing an outline of the opening / closing operation of the blade of a conventional electric scissor.
Referring to the drawings, as described above, in the conventional electric scissors, the upper blade 52 is opened and closed by moving the rod (not shown) forward and backward. In order to obtain the maximum cutting force when cutting the workpiece, the upper blade 52 is completely opened (the state (1) in FIG. 9) to the completely closed state ((2) in FIG. 9). ), The moment of the force applied to the operating portion 59 is maximum, that is, when the upper blade 52 moves in the closing direction and cuts the workpiece, It suffices if the extending direction and the moving direction of the rod are substantially orthogonal to each other. On the other hand, the extending direction of the lower blade 53 is assumed to be a direction orthogonal to the vertical line 61 passing through the shaft 54. Then, in the state where the upper blade 52 is completely opened as shown in (1) of FIG. 9, the operating portion 59 is positioned on the front side of the vertical line 61 passing through the shaft 54.

  Therefore, in the electric scissors as described above, the operating portion 59 protrudes to the outer side portion of the lower blade 53 on the front side of the vertical line 61, and this portion may become an obstacle when the electric scissors are used. In particular, when the conventional electric fence is used for pruning work such as overgrown trees, the projecting part of the operating part 59 is caught on a branch or the like, or the space around the part to be cut is relatively narrow , It is difficult to align the work piece and the blade of the electric scissors, and it is not easy to use.

  In order to further increase the moment of force about the shaft 54 of the operating portion 59, the distance between the shaft 54 and the shaft 55 (r in (1) of FIG. 9) may be increased. 59 protrudes further to the outer side of the lower blade 53, and the space without an obstacle on the outer side of the lower blade 53 is further narrowed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric scissor with few obstacles in the space around the blades when the pair of blades are opened.

  In order to achieve the above-mentioned object, the invention according to claim 1 is an electric scissor, which is a first blade in a fixed state extending forward and an open state with respect to the first blade attached about a shaft. A second blade that is integrally connected to the blade portion, and that is at least connected to the blade portion and extends from the shaft to the rear side in the open state; A rod that engages and extends rearward and can be moved forward and backward with respect to the operating portion, and is connected to the rod, and as the rod advances, the blade changes from an open state to a closed state. Along with this, control means for controlling the rod is provided so that the blade portion changes from the closed state to the open state.

  If comprised in this way, in the state which the blade part opened with respect to the 1st blade, an operation part will be located in the back side from an axis.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the second blade has an angle of approximately 90 degrees between the direction in which the blade portion extends from the shaft and the direction in which the operating portion extends from the shaft. Thus, the axial direction of the rod is arranged substantially parallel to the direction in which the blade portion extends during cutting.

  If comprised in this way, the maximum moment will generate | occur | produce in an action | operation part via a rod at the time of a cutting | disconnection.

  According to a third aspect of the invention, in the configuration of the first or second aspect of the invention, the operating portion is positioned so as to extend forward from the shaft in the closed state.

  If comprised in this way, the position where a maximum moment will generate | occur | produce in a blade part will arise, while a blade part moves from an open state to a closed state.

  According to a fourth aspect of the present invention, in the configuration of the first aspect of the present invention, the control means is connected to the screw shaft disposed substantially parallel to the axial direction of the rod, and the screw shaft. The motor consists of a motor that can rotate the screw shaft around its axis, and a nut that is fixed to the rod and that engages with the screw shaft and can move forward or backward depending on the direction of rotation. is there.

  If comprised in this way, the moving direction of a rod is controlled by the rotation direction of the motor connected to the screw shaft.

  According to a fifth aspect of the invention, in the configuration of the fourth aspect of the invention, the screw shaft and the nut constitute a ball screw which is not preloaded.

  If comprised in this way, when rotation of a screw shaft and a nut will stop, these will return to the state before rotation.

  According to a sixth aspect of the present invention, in the configuration of the fourth or fifth aspect of the present invention, the control means includes a battery for driving the motor and an instruction means for instructing normal rotation, reverse rotation and stop of the motor. In addition, regenerative braking is performed when the motor switches from the rotation state to the stop state in response to the instruction output from the instruction means.

  If comprised in this way, a battery will be charged with the inertial force of the motor shaft from the stop instruction | indication with respect to a motor to the moment which stopped.

  The invention according to claim 7 is the configuration of the invention according to any one of claims 1 to 6, wherein the electric rod further includes a main body case including a flat plate portion having a surface substantially parallel to the axial direction of the shaft. The rod is disposed so as to penetrate the flat plate portion, and at least a part thereof is supported by the flat plate portion.

  If comprised in this way, the length of the part of the rod which protruded ahead from the flat plate part will become short.

  As described above, according to the first aspect of the present invention, in the state in which the blade portion is opened with respect to the first blade, the operating portion is located on the rear side from the shaft. In addition, the usability of the electric rod is improved.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 generates a maximum moment in the operating part via the rod during cutting, so that when cutting the workpiece, the rod moves from the rod to the blade part. A force is transmitted efficiently and a large cutting force can be obtained.

  In addition to the effects of the invention described in claim 1 or 2, the invention described in claim 3 has a position where the maximum moment is generated in the blade portion while the blade portion moves from the open state to the closed state. Therefore, efficient cutting of the workpiece is possible.

  In the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the moving direction of the rod is controlled by the rotation direction of the motor connected to the screw shaft. It is possible to easily switch the movement of the first blade to the open state and the movement to the closed state.

  In addition to the effect of the invention described in claim 4, when the rotation of the screw shaft and the nut is stopped, the invention returns to the state before the rotation. The backlash allows the rod fixed to the nut to move slightly back and forth, and the buckling state of the rod when cutting is stopped is alleviated.

  In addition to the effects of the invention of claim 4 or 5, the invention of claim 6 charges the battery every time the motor is instructed to stop. Can be used.

  In addition to the effect of the invention according to any one of claims 1 to 6, the invention according to claim 7 is due to buckling because the length of the rod portion protruding forward from the flat plate portion is shortened. Rod deformation is less likely to occur.

FIG. 1 is a diagram showing a schematic configuration of a motor-driven saddle according to the first embodiment of the present invention.
Referring to the drawing, the electric rod 1 includes a fixed lower blade 3, an upper blade 2 that can be opened and closed with respect to the lower blade 3, a rod 8 for opening and closing the upper blade 2, a DC motor 15 and the like. Control means for controlling the movement of the including rod 8. The main part of the control means is housed in the main body case 13. First, these configurations will be described.

  The lower blade 3 is disposed such that the tip of the blade extends forward, and is fixed to an extension piece 14 provided so as to protrude forward from the flat plate portion 21 a of the main body case 13. The upper blade 2 is pivotally attached to the lower blade 3 via a shaft 4, and is integrally connected to the blade portion 31 and a blade portion 31 disposed so that the tip of the blade extends forward from the shaft 4. And an operating portion 32 extending rearward from the shaft 4. The end portion 33 of the operating portion 32 is rotatably connected to the link 5 via the pin 6a. The blade portion 31 and the operating portion 32 of the upper blade 2 are integrated, and the angle formed by the directions extending from the shaft 4 is set to be approximately 90 degrees. The solid line in the figure centering on the shaft 4 is shown. It is possible to move between the position indicated by the two-dot chain line.

  The rod 8 is arranged in the upper part of the electric rod 1 so that the axial direction extends rearward from the shaft 4. The end portion on the front side of the rod 8 is rotatably connected to one pin 6 b of the link 5 and is engaged with the operating portion 32 of the upper blade 2 via the link 5. The rod 8 is attached so as to pass through a pair of flat plate portions 21 a and 21 b disposed substantially parallel to the axial direction of the shaft 4, and can advance and retreat with respect to the operating portion 32.

  The control means for controlling the forward and backward movement of the rod 8 includes a screw shaft 10, a nut 11 and a coupling 12 housed in the body case 13, a motor 15, a transmission 16 and a battery 23, and rotation of the motor 15. It comprises an operation switch 18 for controlling the state, limit switches 19a and 19b, and a control unit 22. The operation switch 18 and the limit switches 19a and 19b constitute instruction means for instructing the rotation state of the motor.

  The motor 15 is mounted on the outer surface of the flat plate portion 21b at the rear portion of the main body case 13 with the transmission 16 mounted, and the shaft 17 connected to the transmission 16 passes through the flat plate portion 21b and passes through the main body case 13. Is inserted inside.

  The screw shaft 10 is disposed substantially parallel to the axial direction of the rod 8 inside the main body case 13. A front end portion of the screw shaft 10 is rotatably attached so as to penetrate the flat plate portion 21a of the main body case 13, and a rear end portion is inserted from the outer surface side of the flat plate portion 21b. Is connected to the shaft 17 through the coupling 12. Therefore, the screw shaft 10 can be rotated around the axis center according to the rotation direction of the motor 15. And the nut 11 fixed to the rod 8 via the bolts 9a and 9b is attached to the screw shaft 10 in an engaged state. The screw shaft 10 and the nut 11 constitute a ball screw without a preload. The nut 11 can smoothly advance or retreat along the screw shaft 10, and the screw shaft 10 and the nut 11 can be backlashed by the backlash of the ball screw. Can move slightly in the axial direction. These points will be described later.

  Note that a pair of limit switches 19 a and 19 b are attached to positions inside the main body case 13 along the axial direction of the screw shaft 10. The limit switch 19a on the front side is disposed at a position where the end of the nut 11 is turned on when the nut 11 moves forward by the rotation of the screw shaft 10 and reaches the position indicated by the two-dot chain line. The limit switch 19b on the rear side is turned on by the extension piece 20 attached to the nut 11 so as to extend rearward from the nut 11 when the nut 11 moves backward by the reverse rotation of the screw shaft 10 and reaches the position indicated by the solid line. It is arranged at a position where it becomes a state. These limit switches 19a and 19b are configured to stop the motor 15 when turned on, and are attached to define the movable range of the nut 11.

  An operation switch 18 for operating opening / closing of the upper blade 2 is attached to the lower part of the main body case 13 so as to protrude outward. The operation switch 18 is movable in the direction of the arrow between the position pushed inward and the position shown in the figure, and these positions correspond to an ON state and an OFF state, respectively.

  The control unit 22 includes a control circuit centered on the CPU, and controls power supply from the battery 23 to the motor 15 based on the ON / OFF states of the operation switch 18 and limit switches 19a and 19b. 15 is rotated forward, reverse or stopped. Further, when the motor 15 is switched from the rotation state to the stop state, the control unit 22 is configured to perform regenerative braking by the inertial force after the stop instruction of the motor 15. Details of the control content of the motor 15 by the control unit 22 will be described later.

  Next, the operation of the electric rod 1 configured as described above will be described.

  The electric rod 1 is configured so that the blade 31 can be opened and closed by turning the operation switch 18 on and off while a main switch (not shown) is in an ON state. When the operation switch 18 is pushed in and turned on, the motor 15 rotates in the forward direction. Then, the screw shaft 10 connected via the coupling 12 also rotates, and the nut 11 moves forward along the axial direction of the screw shaft 10. At this time, since the rod 8 and the nut 11 are integrally moved forward, the upper blade 2 connected to the rod 8 via the link 5 is moved to the position indicated by the two-dot chain line around the shaft 4. An object to be cut disposed between the blade portion 31 and the lower blade 3 can be cut.

  On the other hand, when the operation switch 18 is released, it automatically returns to the position shown by the solid line in FIG. In the electric rod 1, the motor 15 is controlled to rotate in the reverse direction when the operation switch 18 is turned off. At this time, since the nut 11 and the rod 8 are integrally retracted, the upper blade 2 is moved from the position of the two-dot chain line to the position of the solid line, and the blade portion 31 is opened with respect to the lower blade 3.

  Even if the operation switch 18 is continuously pressed, the forward rotation of the motor 15 is controlled to stop when the limit switch 19a is turned on by the advancement of the nut 11 as described above. Similarly, when the operation switch 18 is kept released, the reverse rotation of the motor 15 is controlled to stop when the limit switch 19b is turned on.

  In the electric rod 1 of this embodiment, the control is performed such that when the operation switch 18 is pressed, the blade portion 31 moves in the closing direction, and when the operation switch 18 is released, the blade portion 31 moves in the opening direction. Therefore, the user can use the electric scissors 1 with the same feeling as a manual scissors, and it is easy to use.

  As described above, in the electric rod 1, the upper blade 2 is opened and closed by moving the rod 8 back and forth as in the conventional example shown in FIG. 8, but the upper blade 2 is opened as the rod 8 moves forward. The point which cut | disconnects a to-be-cut object by moving so that it may change to a closed state from a state differs greatly from a prior art example.

  FIG. 2 is a diagram schematically showing the opening / closing operation of the blade of the electric scissors according to the first embodiment of the present invention.

  Referring to (1) of FIG. 2, when the vertical line 34 that passes through the shaft 4 and is orthogonal to the rod (not shown) is used as a reference, the operating portion 32 of the upper blade 2 has the blade portion 31 opened with respect to the lower blade 3. In the state, it is configured to extend rearward from the vertical line 34. Then, as the rod advances, the blade portion 31 moves about the shaft 4 and closes to the lower blade 3 as shown in FIG. It arrange | positions so that it may extend to the front side more. Therefore, the operating portion 32 always passes on the vertical line 34 while the blade portion 31 moves from the open state to the closed state, and an orthogonal state between the rod (not shown) and the extending direction of the operating portion 32 occurs. Become. In addition, as described above, the upper blade 2 is configured such that the direction in which each of the blade portion 31 and the operation portion 32 extends from the shaft 4 forms an angle of approximately 90 degrees, so that the operation portion 32 is vertical. When passing over the line 34, the extending direction of the blade 31 is substantially horizontal. Therefore, if the forward force of the rod is constant, the moment in the operating portion 32 is maximized at the point of cutting the workpiece. Therefore, at this time, the force is most efficiently transmitted from the rod to the blade portion, and a large cutting force can be exhibited.

  Further, when the configuration of the upper blade 2 and the rod is configured to move the blade portion 31 from the open state to the closed state when the rod advances in this way, the blade portion 31 opens with respect to the lower blade 3. In the state, the operating portion 32 does not protrude forward from the vertical line 34 as in the conventional example. Therefore, even when cutting a workpiece that is crowded with a portion to be cut, the operating portion 32 does not become an obstacle when positioning the blade portion 31 and the lower blade 3 and the like is easy to use. It becomes.

  After the cutting, the operating portion 32 is positioned in front of the vertical line 34. However, since the alignment is not performed in a state where the blade portion 31 is already closed, the operating portion 32 is substantially Therefore, it does not become an obstacle to the cutting work, and no trouble occurs.

  Furthermore, even if the distance between the shaft 4 and the pin 6a (r in (1) in FIG. 2) is further increased in order to further increase the efficiency of force transmission from the rod, the actuating portion 32 is more than the vertical line 34. Furthermore, it will be located so that it may extend back. Therefore, even if the dimension r of the actuating part 32 is increased, the actuating part 32 does not become an obstacle when the electric rod is used, and it can be designed to obtain a larger moment.

  FIG. 3 is a diagram showing an outline of an operation for avoiding the buckling phenomenon of the rod during cutting in the electric scissor according to the first embodiment of the present invention.

  Referring to the figure, when cutting the workpiece 30 with the electric scissors 1, if the workpiece 30 is very hard or has a large diameter, the blade 31 can be closed once. It may not be possible to cut. At this time, as indicated by the solid line in the figure, the movement of the blade portion 31 is stopped while the workpiece 30 is being cut. Usually, the cutting object 30 may be cut by repeating the operation of opening the blade 31 that has stopped moving once and then closing it again. However, if the rod 8 is still unable to move and the rod 8 continues to advance in the direction in which the blade 31 is closed, the operating portion 32 is in a fixed state, so that an excessive compressive force is generated on the rod 8 and buckles. There is a risk of deformation. Further, if the operation switch 18 is continuously pressed while the blade portion 31 is prevented from moving in the closing direction, an overcurrent continues to flow through the motor, which may cause a failure of the motor or the like.

  Therefore, in the electric rod 1, in order to avoid the buckling state, first, when an overcurrent exceeding a threshold value is detected in the control unit, the power supply to the motor is cut off. Next, at the moment when the motor is stopped, the rod 8 is moved slightly backward by the distance d shown in the figure. By controlling in this way, each of the upper blade 2 and the link 5 can move slightly from the position indicated by the solid line to the position indicated by the two-dot chain line, so that the blade portion 31 is always closed. Compared with a state where the rod is continuously pressed, the compressive force applied to the rod 8 or the like is reduced, and buckling can be avoided.

  The electric rod 1 is configured such that the rod 8 passes through the flat plate portion 21 a of the main body case 13 and at least a part of the flat plate portion 21 a supports the outer peripheral surface of the rod 8. Accordingly, since the distance between the supported portions sandwiched between the pin 6b and the flat plate portion 21a in the rod 8 is reduced, the slenderness ratio is reduced and deformation of the rod 8 due to buckling is less likely to occur.

  Here, a mechanism for slightly retracting the rod described above when a buckled state occurs will be described.

  FIG. 4 is a cross-sectional view showing a schematic configuration of the ball screw portion of the electric rod according to the first embodiment of the present invention.

  Referring to the figure, the screw shaft 10 and the nut 11 constitute a ball screw in which a plurality of balls 26 are arranged in a space between the valleys 27 and 28. As a result, the frictional resistance during rotation between the screw shaft 10 and the nut 11 becomes extremely small, so that the nut 11 can move smoothly by the rotation of the screw shaft 10.

  Further, since this ball screw is configured without a preload, the ball 26 can move slightly in the axial direction of the screw shaft 10 between the valley 27 and the valley 28. As a result, a backlash 36 is generated between the screw shaft 10 and the nut 11.

  FIG. 5 is an enlarged view of a “Y” portion shown in FIG. 4 and shows details of an operation for avoiding a buckling phenomenon at the time of cutting.

  First, referring to (1) in FIG. 5, even if the movement of the upper blade stops during cutting of the workpiece, if the operation switch is kept pressed, the motor tries to rotate in the positive direction. The screw shaft 10 continues to push the nut 11 forward (to the left in the figure) via the ball 26. At this time, since the upper blade connected to the nut 11 through the rod cannot move, the rod and the nut 11 receive a reaction force in the rear (right direction in the drawing) indicated by the arrow in the drawing. become. Therefore, if this state is continued, there is a risk that the portion extending forward from the nut 11 of the rod buckles and deforms.

  Therefore, when the upper blade is fixed and an overcurrent exceeding a certain level flows to the motor, the control unit stops the power supply to the motor and stops the rotation of the screw shaft 10 in the positive direction. Then, the screw shaft 10 is in a free state, and since the ball screw is not preloaded, the screw shaft 10 rotates backward by a reaction distance transmitted from the nut 11 via the ball 26 and moves backward by a minute distance c. And the state shown in (2) of FIG. 5 is obtained.

  Referring to (2) of FIG. 5, when the valley 28 of the screw shaft 10 and the valley 27 of the nut 11 face each other in this manner, the ball 26 is moved backward along the valley 28 by the backlash 36. It is possible to move slightly. At this time, the nut 11 continues to receive the reaction force indicated by the arrow in the figure from the rod, and thus moves to the rear side by a minute distance d.

  Then, as shown in (3) of FIG. 5, as a result of the nut 11 moving rearward with respect to the screw shaft 10, the position of the nut 11 is the position at which the upper blade stops moving ((1 in FIG. 5). Compared with)), the vehicle is moved backward by a minute distance d. Then, the compressive force generated in the rod is relieved more greatly than when the upper blade stops moving, and buckling of the front portion of the rod nut can be avoided.

  Here, the details of the control process for realizing the control of the operation of the electric rod as described above will be described.

  FIG. 6 is a flowchart showing a control process of the control unit in the electric saddle according to the first embodiment of the present invention. In the figure, “SW” is an abbreviation for a switch.

  The electric rod according to this embodiment includes a main switch (not shown) in addition to the operation switch, and is configured so that the operation switch can be switched on and off only when the main switch is in the ON state. Yes. Further, when the main switch is in the OFF state, the upper blade is configured to be completely closed.

  Referring to the figure, when the main switch is ON (Yes in S101), the operation switch is once turned ON (Yes in S102), and then the operation switch is turned OFF again (Yes in S103). Is reversely rotated (S104). When the nut engaged with the screw shaft is retracted along with the reverse rotation of the motor and the rear limit switch is turned on (Yes in S105), the control unit stops supplying power to the motor (S106). The motor is controlled as a generator by the inertial force of the shaft, regenerative braking is performed, and the battery is charged (S107). When controlled in this way, when the main switch is OFF, the upper blade, which has been closed for safety, is fully opened, and the user can start cutting the workpiece. .

  After the control unit once opens the closed upper blade, as long as the main switch is ON (Yes in S108), the control main process (S109) described later is continued based on the state of the operation switch and the limit switch. And do it.

  When the main switch is turned off (No in S108), the control unit rotates the motor forward (S110). When the nut advances and the front limit switch is turned on (Yes in S111), the control unit stops supplying power to the motor (S112) and performs regenerative braking by the inertial force of the motor (S113). If it does in this way, after turning off a main switch, an upper blade will be in the state closed completely, and safety when not using an electric rod is secured.

  FIG. 7 is a flowchart showing a control process in the control main process shown in FIG.

  Referring to the figure, at the start of the control main process, the main switch is first turned ON and the motor is stopped (the case where the control main process (S109) starts through S107 to S108 in FIG. 6), Or, it is one of the states where the motor is stopped by the control in use (the case where the control process (S109) is started after returning from S214, S215 in FIG. 7 to S108 in FIG. 6). When the operation switch is turned on from this state (Yes in S201), the control unit rotates the motor forward (S202). At this time, the upper blade moves in the closing direction and can cut the workpiece.

  First, the control process when the operation switch is in the ON state will be described.

  When the operation switch changes from ON to OFF (No in S203), the power supply to the motor is stopped (S204), after regenerative braking is performed (S205), the motor is rotated in the reverse direction (S211).

  While the operation switch is still ON (Yes in S203), the front limit switch is OFF (No in S206), and while the current value is smaller than a certain value (No in S210), the control unit Continue normal rotation.

  When the operation switch is still ON (Yes in S203) and the nut advances and the front limit switch is turned ON (Yes in S206), the control unit stops supplying power to the motor (S207) and regenerative braking. (S208). Further, even when the front limit switch is not in the ON state (No in S206), when it is detected that the value of the current flowing through the motor has become a certain value or more as a result of the rod being stopped by the hard object to be cut (in S210 Yes) In order to stop the motor to prevent the rod from buckling, the control unit stops power supply (S207) and performs regenerative braking (S208). In either case, the operation switch remains on and the motor is stopped. When the operation switch is turned off (Yes in S209), the control unit rotates the motor in the reverse direction (S211).

  Next, control processing when the operation switch is in the OFF state will be described.

  When the operation switch is OFF and the motor is rotating in the reverse direction (S211), when the operation switch changes to ON (No in S212), the power supply to the motor is stopped (S214) and regenerative braking is performed (S214). S215). Thereafter, the control unit once returns the process to the main routine shown in FIG. 6, and then repeats the control when the operation switch is in the ON state again from S201.

  If the operation switch is still OFF (Yes in S212) and the rear limit switch is also OFF (No in S213), the control unit continues the reverse rotation of the motor.

  When the operation switch is still OFF (Yes in S212) and the nut is retracted and the rear limit switch is turned ON (Yes in S213), the control unit stops supplying power to the motor (S214) and regenerative braking. I do. Thereafter, the control unit similarly returns the process to the main routine of FIG. 6 and then repeats the control process from S201 again.

  As described above, the control unit is configured so that the control unit can control forward rotation, reverse rotation, and stop of the motor based on the ON / OFF states of the main switch, the operation switch, and the limit switch. Then, when the motor is shifted from the rotating state to the stopped state, the power supply is cut off, and regenerative braking is performed using the inertial force of the motor at that moment. For this reason, when switching the opening / closing direction of the blade portion of the electric rod, that is, the rotation direction of the motor, since the motor is temporarily stopped, the battery is charged every time switching is performed. Therefore, compared with the case where regenerative braking is not performed, the consumption of subtraction of the battery is reduced, and it becomes possible to use the electric rod for a longer time by charging the battery once.

  In the above-described embodiment, the blade portion and the operating portion of the upper blade, which is the second blade, are formed so that the extending directions of each blade are approximately 90 degrees, but are necessarily 90 degrees. It is not necessary, and it can be formed at other angles as long as the operating portion is formed to extend rearward from the shaft in the open state.

  Moreover, in said embodiment, when the blade part of a 2nd blade will be in a closed state with respect to the lower blade which is a 1st blade, it forms so that it may be located ahead from an axis | shaft. However, it is not always necessary to configure in this way, and even if the operating part is configured to be located only in the rear part of the shaft, the operating part does not become an obstacle when the blade part is open. .

  Furthermore, in the above embodiment, the axial direction of the rod is set so as to be substantially parallel to the extending direction of the blade portion at the time of cutting, but is not necessarily limited to the parallel arrangement. You may arrange | position a rod in the other angle which can move the action | operation part of the blade of this.

  Further, in the above embodiment, the screw shaft is connected to the shaft of the transmission of the motor mounted on the outer surface of the main body case via the coupling, but it is not always necessary to configure in this way. The motor and the transmission may be separated from the main body case, and the motor-side shaft and the screw shaft may be connected by a deformable transmission mechanism such as a flexible shaft. In addition, since the body case portion is lightened in this way, the usability is further improved.

  Furthermore, in the above embodiment, the control means for controlling the forward and backward movement of the rod has a configuration including a DC motor and a battery. However, the control means may be another power mechanism using electric power such as an AC motor. It is good also as a structure including.

  Furthermore, in the above-described embodiment, the screw shaft and the nut constitute a ball screw that is not preloaded, but the screw shaft is not necessarily limited to the ball screw, and may be a screw of another shape. Further, even a ball screw may be a preloaded ball screw.

  Further, in the above-described embodiment, the rod is attached so as to penetrate a pair of flat plate portions formed on the front and rear of the main body case. The blade portion may be engaged with the operating portion so that the blade portion changes to the closed state and changes to the open state as the blade moves backward.

  Furthermore, in the above embodiment, the control unit performs regenerative braking when switching the motor from the rotation state to the stop state, but the control unit may be configured not to perform regenerative braking.

  Furthermore, in the above embodiment, the lower blade as the first blade is fixed to the extension piece protruding forward from the main body case, but the first blade is formed in the same manner as the second blade. Further, another rod connected to the nut is further provided and connected to the first blade, and the first blade is also configured to be opened and closed about the axis by the control means simultaneously with the second blade. Is also possible.

It is the figure which showed schematic structure of the electrically driven rod by 1st Embodiment of this invention. It is the figure which showed the outline of the opening-and-closing operation | movement of the blade of the electric scissors by 1st Embodiment of this invention. It is the figure which showed the outline of the avoidance operation | movement of the buckling phenomenon of the rod at the time of a cutting | disconnection in the electric scissors by 1st Embodiment of this invention. It is sectional drawing which showed schematic structure of the ball screw part of the electrically driven rod by 1st Embodiment of this invention. FIG. 5 is an enlarged view of a “Y” portion shown in FIG. 4, and shows details of an operation for avoiding a buckling phenomenon during cutting. It is the flowchart which showed the control processing of the control part in the electrically powered rod by 1st Embodiment of this invention. It is the flowchart which showed the control process in the control main process shown in FIG. It is a partially broken figure which showed schematic structure of the front-end | tip part of the conventional electric rod. It is the figure which showed the outline of the opening / closing operation | movement of the blade of the conventional electric rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric rod 2 ... Upper blade 3 ... Lower blade 4 ... Shaft 8 ... Rod 10 ... Screw shaft 11 ... Nut 13 ... Main body case 15 ... Motor 18 ... Operation switch 19 ... Limit switch 21 ... Flat plate part 22 ... Control part 23 ... Battery 31... Blade portion 32... Actuating portion The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (7)

Electric scissors,
A fixed first blade extending forward;
A blade portion that is mounted around a shaft and is rotatable in an open state and a closed state with respect to the first blade, and is integrally connected to the blade portion, at least when the blade portion is in the open state, the shaft A second blade consisting of an operating part extending rearward from
A rod that engages with the operating portion and extends rearward, and is capable of moving forward and backward with respect to the operating portion;
The blade is connected to the rod, so that the blade changes from the open state to the closed state as the rod advances, and the blade changes from the closed state to the open state as the rod moves backward. And a control means for controlling the rod. The second blade is formed such that an angle formed between a direction in which the blade portion extends from the shaft and a direction in which the operation portion extends from the shaft is approximately 90 degrees.
The electric rod according to claim 1, wherein an axial direction of the rod is disposed substantially parallel to a direction in which the blade portion extends at the time of cutting. 3. The electric rod according to claim 1, wherein the operating portion is positioned so as to extend forward from the shaft in the closed state. The control means includes
A screw shaft disposed substantially parallel to the axial direction of the rod;
A motor that is connected to the screw shaft and that allows the screw shaft to rotate about its axis;
The electric rod according to any one of claims 1 to 3, comprising a nut that is fixed to the rod and engages with the screw shaft and can be moved forward or backward depending on a rotation direction thereof. The electric rod according to claim 4, wherein the screw shaft and the nut constitute a ball screw which is not preloaded. The control means further includes a battery for driving the motor, and an instruction means for instructing normal rotation, reverse rotation, and stop of the motor, and the motor is rotated from a rotating state in response to an instruction output by the instruction means. 6. The electric rod according to claim 4 or 5, wherein regenerative braking is performed when switching to a stop state. The electric rod further includes a body case including a flat plate portion having a surface substantially parallel to the axial direction of the shaft,
The electric rod according to any one of claims 1 to 6, wherein the rod is disposed so as to penetrate the flat plate portion, and at least a part thereof is supported by the flat plate portion.

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