JP2011250772A - Pruning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pruning machine, preventing an upper blade and a lower blade from overlapping each other when a motor stops, and achieving fine adjustment of positional relationship between the upper blade and the lower blade.SOLUTION: The pruning machine 1 includes a housing 2, wherein the motor 6 is stored in the housing 2. The output of the motor 6 is transmitted to the upper blade 41 and the lower blade 42 through a rotational motion transmitting mechanism 5 for converting the rotational motion to the reciprocating motion. The pruning machine 1 further includes a control means for stopping the upper blade 41 and the lower blade 42 to have a predetermined positional relationship when the motor 6 enters the stop state from the operating state.

Description

  The present invention relates to a trimming machine, and more particularly to a trimming machine for pruning and trimming trees.

  As shown in FIG. 12, the conventional trimming machine 301 includes a housing 302, a blade 304 including an upper blade 341 and a lower blade 342, a rotational movement transmission mechanism 305, a motor 306, a trigger 334, and a battery 333. Composed. By pulling the trigger 334, electric power is supplied from the battery 333 to the motor 306, and the rotational force is transmitted to the rotational motion transmission mechanism 305 to reciprocate the blade 304.

Japanese Patent Laid-Open No. 2007-282557

  In the conventional trimming machine 301, when the trigger 334 is released while the blade 304 is reciprocating, depending on the timing, the upper blade 341 and the lower blade 342 may stop and overlap. In this state, the back surfaces of the blades of the upper blade 341 and the lower blade 342 are in contact with each other, so that dirt such as sap and dirt adhered to the back surfaces of the upper blade and the lower blade cannot be removed. In order to expose the back surfaces of the upper blade 341 and the lower blade 342, it is necessary to finely adjust the positions of the upper blade 341 and the lower blade 342 by pulling the trigger 334 again. However, even if the trigger 334 is slightly operated again, it is difficult to finely adjust the positions of the upper blade 341 and the lower blade 342 because of the high blade movement speed, and the upper blade 341 is again affected by the inertia of the motor 306 and the like. The upper blade 341 and the lower blade 342 could not be stopped at the position as expected because the lower blade 342 and the lower blade 342 overlapped.

  In view of the above problems, an object of the present invention is to provide a trimming machine capable of preventing the upper blade and the lower blade from overlapping when the motor is stopped and finely adjusting the positional relationship between the upper blade and the lower blade. And

  The trimming machine according to the present invention includes a housing, a motor housed in the housing, a rotational motion transmission mechanism that converts the rotational motion of the motor into a reciprocating motion, and at least one of the rotational motion transmission. A pair of upper and lower blades reciprocally driven by the motor via a mechanism, and a control means for stopping the upper blade and the lower blade in a predetermined positional relationship when the motor enters a stopped state from the operating state; It is characterized by having.

  Moreover, it is preferable that the predetermined positional relationship between the upper blade and the lower blade is such that the lower blade does not overlap the tip side from half the total length of the upper blade.

  A motor current detector for detecting a current value of the motor; and the control means is connected to the motor and the motor current detector, and when the motor enters a stop state from an operating state, the motor It is preferable to stop the motor at the rotational position of the motor when the current detected by the current detector becomes a predetermined value or less.

  According to such a configuration, since the motor stops at a position where the current value of the motor is equal to or less than a predetermined value, the motor stops at a position where the resistance between the upper blade and the lower blade is small. The position where the resistance is low is a position where there is little overlap between the upper blade and the lower blade. At this position, the back surface of the upper blade and the back surface of the lower blade are exposed to each other. Thereby, the back surface of the upper blade and the lower blade can be easily cleaned. Further, since the upper blade and the lower blade are stopped in a state where they do not overlap each other, it is possible to prevent foreign matter from being caught between the upper blade and the lower blade at the time of stopping.

  Moreover, it is preferable to have a correction means capable of correcting a predetermined positional relationship between the upper blade and the lower blade stored in the control means.

  Further, the trimming machine further has a trigger for selectively switching between supply and cut-off of power to the motor, and when the motor pulls the trigger for a predetermined time in a no-load state, the control means When the motor enters the stop state from the operating state, it is preferable to stop the motor at the rotational position of the motor at the lower limit current value.

  According to such a configuration, the rotation position of the motor when the motor current value is a predetermined value is automatically stored by pulling the trigger for a predetermined time when the power is turned on. As a result, even if the mower is disassembled / repaired and the positional relationship between the motor and the upper and lower blades is shifted, the position where the upper blade and the lower blade do not overlap each other is grasped again. The motor can be stopped at the position. Thereby, the back surface of the upper blade and the lower blade can be easily cleaned.

  Further, the trimming machine further has a notification means connected to the control means and capable of selectively switching between lighting and extinction, and when the control means stores the lower limit current value of the current value of the motor, the notification Preferably the means are lit.

  According to such a configuration, when the control unit stores a predetermined value, the notification unit is turned on. As a result, the operator sets a new rotational position of the motor, cancels the deviation of the positional relationship between the motor position and the upper blade and the lower blade, and stops at a position where the upper blade and the lower blade do not overlap each other. Can be confirmed.

  The motor is preferably a brushless motor.

  According to such a configuration, the life of the motor can be increased by using a brushless motor as the motor. In addition, fine position adjustment is facilitated during reverse rotation and forward rotation.

  Further, it is preferable that the control means stops the rotation of the motor when the current value detected by the motor current detector exceeds a set value.

  According to such a configuration, it is possible to prevent the motor from being burned out due to overcurrent.

  Further, it is preferable to have fine movement means for finely moving the rotational movement transmission mechanism.

  In addition, it is preferable to have a fine adjustment mechanism in which one end portion projects from the housing, the other end portion can be engaged with the rotational motion transmission mechanism, and the rotational motion transmission mechanism can be operated by operating the one end portion.

  According to such a configuration, the other end of the fine adjustment mechanism is directly engaged with the gear of the rotational motion transmission mechanism without any other member, so that the number of parts can be reduced and the manufacturing cost can be reduced. it can.

  According to the trimming machine of the present invention, the upper blade and the lower blade can be prevented from overlapping and the positional relationship between the upper blade and the lower blade can be finely adjusted.

1 is a side sectional view showing a trimming machine according to a first embodiment of the present invention. The perspective view which shows the relationship between the motor which concerns on the 1st Embodiment of this invention, a control board, a rotational movement transmission mechanism, and a braid | blade. The perspective view which shows the state with which the upper blade and lower blade which concern on the 1st Embodiment of this invention overlapped. The figure which shows the operation state of the braid | blade which concerns on the 1st Embodiment of this invention. The figure which shows the operation state of the fine adjustment mechanism which concerns on the 1st Embodiment of this invention. The figure which looked at the operation state of the fine adjustment mechanism which concerns on the 1st Embodiment of this invention from upper direction. The block diagram which shows the structure of the control circuit which concerns on the 1st Embodiment of this invention. The graph which shows typically the electric current value of the current sensor in the no-load state which concerns on the 1st Embodiment of this invention. The flowchart which shows the operation | movement which concerns on the 1st Embodiment of this invention. Side surface sectional drawing which shows the trimming machine which concerns on the 2nd Embodiment of this invention. The flowchart which shows the operation | movement which concerns on the 2nd Embodiment of this invention. The fragmentary sectional view which shows the conventional trimming machine.

  Hereinafter, a first embodiment of a trimming machine of the present invention will be described with reference to FIGS. A trimming machine 1 shown in FIG. 1 includes a housing 2, a blade 4, a rotational motion transmission mechanism 5, and a motor 6. A direction from the rotational motion transmission mechanism 5 toward the motor 6 is defined as an upward direction, and the opposite is defined as a downward direction. The direction in which the blade 4 extends from the housing 2 is defined as the right direction, and the opposite is defined as the left direction.

  The housing 2 includes a main body portion 21 in which the rotary motion transmission mechanism 5 and the motor 6 are accommodated, and a handle portion 3 extending leftward from the upper portion of the main body portion 21. A slide groove 2a is formed in a base portion from which a second handle portion 32 described later extends. A part of a fine adjustment mechanism 56 to be described later protrudes from the slide groove 2a. As shown in FIG. 6B, the slide groove 2a has a substantially rectangular shape with the major axis in the tangential direction of the position of the slide groove 2a as viewed from the center of the first gear 51 described later.

  The motor 6 has an output shaft 6A, and is disposed in the main body 21 so that the output shaft 6A extends downward. An output gear 61 is coaxially fixed to the output shaft 6A.

  The rotational motion transmission mechanism 5 includes a first gear 51, a first rotation shaft 52, a second gear 53, an eccentric cam 54, and a second rotation shaft 55. As shown in FIGS. 1 and 2, the first gear 51 is formed on the lower side of the first tooth surface 51 </ b> A having a first tooth surface 51 </ b> A meshing with the output gear 61 and a smaller diameter than the first tooth surface 51 </ b> A. And a plurality of protrusions 51C that are formed on the periphery of the upper surface of the first tooth surface 51A and can be engaged with the fine adjustment mechanism 56 and protrude upward (FIG. 2). The first gear 51 has an insertion hole 51a formed in the axial center thereof, and the first rotation shaft 52 is inserted through the insertion hole 51a.

  The first rotating shaft 52 is rotatably supported on the housing 2. The second gear 53 meshes with the second tooth surface 51B, and an insertion hole 53a is formed in the shaft core. The second rotation shaft 55 is inserted through the insertion hole 53a. The second rotating shaft 55 is rotatably supported on the housing 2. On the lower surface of the second gear 53, a hole (not shown) into which an engagement protrusion 54C described later is inserted is formed.

  As shown in FIG. 2, the eccentric cam 54 includes two engaging projections 54C inserted into a hole (not shown) of the second gear 53, a first eccentric cam 54A formed at the upper part in the axial direction, A lower eccentric cam 54A has a second eccentric cam 54B having a smaller diameter than the first eccentric cam 54A and having a center different from the center of the first eccentric cam 54A. Two engaging protrusions 54C protrude upward from the upper surface of the second gear 53, and are engaged with a hole (not shown) formed in the lower surface of the second gear 53, so that the second gear 53, the eccentric cam 54, Rotate the same.

  As shown in FIGS. 5 and 6, a fine adjustment mechanism 56 is provided so that a part thereof protrudes from a slide groove 2 a formed in the housing 2, and a knob portion 56 </ b> A is provided above the fine adjustment mechanism 56. An engagement hole 56a that is provided and engageable with the protrusion 51C is formed in the lower part. The fine adjustment mechanism 56 is biased upward with respect to the engagement hole 56a by the spring 56B, and the movement of the fine adjustment mechanism 56 is restricted by the slide groove 2a as shown in FIG. By pressing the knob portion 56A, the fine adjustment mechanism 56 moves downward against the urging force of the spring 56B, and the engagement hole 56a and the projection 51C on the first gear 51 as shown in FIG. And engage. In this state, when the fine adjustment mechanism 56 is slid to the end of the slide groove 2a shown in FIG. 5C, the first gear 51 operates in a small amount in the circumferential direction, and the upper blade 41 and the lower blade 42 described later operate in a small amount. To do. Here, the minute amount refers to an operation amount until an upper blade 41 and a lower blade 42 described later change from the state shown in FIG. 4A to the state shown in FIG.

  As shown in FIG. 3, the blade 4 has a plurality of saw blades in a substantially fan-shaped circumferential portion, and has an upper blade 41 composed of a surface exposed to the outside and a back surface on the back side thereof, The upper blade 41 and the lower blade 42 having substantially the same shape are positioned so that the back surface is in sliding contact. A blade is formed from the tip of the saw blade to its base, and the length is defined as the blade height. The blade lengths of the upper blade 41 and the lower blade 42 are substantially the same. The upper blade 41 and the lower blade 42 are locked by a locking member 43 so as to be rotatable around the position of the locking member 43. A hole 41a is formed in the upper blade 41, and the first eccentric cam 54A is rotatably inserted. Similarly, a hole 42a is formed in the lower blade 42, and the second eccentric cam 54B is rotatably inserted. As shown in FIGS. 4A to 4C, the eccentric cam 54 rotates while being inserted into the holes 41a and 42a, thereby sliding the upper blade 41 in the direction opposite to the lower blade 42. The lower blade 42 is slid on the back surface of the upper blade 41 in the direction opposite to the upper blade 41. Specifically, the eccentric cam 54 rotates from the position (a) in FIG. 4 (the position where most of the upper blade 41 and the lower blade 42 overlap), whereby the position (upper blade 41) in FIG. And a position where the back surface of the lower blade 42 is completely exposed). Further, when the eccentric cam 54 rotates, the eccentric cam 54 moves to a position shown in FIG. 4C (a position where most of the upper blade 41 and the lower blade 42 overlap). By repeating this operation, the upper blade 41 and the lower blade 42 reciprocate.

  As shown in FIG. 1, the handle portion 3 is formed integrally with the housing 2, and extends from the upper portion of the main body portion 21 to the left outward and the first handle portion 31 leftward from the lower portion of the main body portion 21. The second handle portion 32 extends outward. A battery 33 for supplying power to the motor 6 is detachably attached to the left end of the first handle 31, and power is supplied from the battery 33 to the motor 2 below the base extending from the main body 21. There is provided a trigger 34 for selectively switching between. The trigger 34 is electrically connected to the switch 34A. An on-lock switch 38 is disposed at a position adjacent to the trigger 34 of the first handle portion 31. By pushing the on-lock switch 38 in the state where the trigger 34 is pulled, the state where the trigger 34 is pulled can be held.

  The second handle portion 32 is provided with a control board 35 inside the left end thereof, and is provided with a notification lamp 37 at a position adjacent to the fine adjustment mechanism 56 at the right end portion thereof. The control board 35 is electrically connected to the switch 34A, the motor 6, and the battery 33. The notification lamp 37 is configured to be lit for a predetermined time when correction function setting described later is completed.

  Next, the control circuit of the trimming machine 1 will be described with reference to FIG.

  As shown in FIG. 7, the motor 6 is an inner rotor type, and a rotor (magnet rotor) 6b configured by embedding a permanent magnet (magnet) including a pair of N poles and S poles, and rotation of the magnet rotor 6b. Based on position detection signals from three rotation position detection elements (Hall ICs) 7a, 7b, and 7c arranged at intervals of 60 ° to detect the position, and rotation position detection elements 7a, 7b, and 7c. It is composed of an armature winding 6d composed of three-phase windings U, V, and W of a star-connected stator 6c that is controlled in a current-carrying section of °.

  The FET circuit unit 8 includes six FETs (hereinafter referred to as “transistors”) Q1 to Q6 connected in a three-phase bridge format. The gates of six bridged transistors Q1 to Q6 are connected to a control signal output circuit 71, and the sources or drains of the six transistors Q1 to Q6 are star-connected armature windings U, V and Connected to W. As a result, the six transistors Q1 to Q6 perform a switching operation according to the switching element drive signal input from the control signal output circuit 71, and the DC voltage of the battery 33 applied to the FET circuit unit 8 is supplied to the armature winding U. , V and W.

  The control circuit unit 7 includes a control signal output circuit 71, a calculation unit 72, a current detection circuit 73, a switch operation detection circuit 74, an applied voltage setting circuit 75, a rotation direction setting circuit 76, a rotor position detection circuit 77, and a rotation speed detection. The circuit 78 is configured. Although not shown, the calculation unit 72 is a CPU for outputting a drive signal based on a processing program and data, a ROM for storing a program and control data corresponding to a flowchart to be described later, and for temporarily storing data. The microcomputer includes a RAM, a timer, and the like. The current detection circuit 73 is a circuit for detecting the current flowing through the motor 6, and the detected current is input to the calculation unit 72.

  The switch operation detection circuit 74 is a circuit that detects the operation of the trigger 34. The applied voltage setting circuit 75 is a circuit for setting the applied voltage of the motor 6, that is, the duty ratio of the PWM signal, in response to the pulling amount of the trigger 34. The rotation direction setting circuit 76 is a circuit for setting the rotation direction of the motor 6 by detecting an operation of forward rotation or reverse rotation by the forward / reverse switching lever 79 of the motor 6. The rotor position detection circuit 77 detects the relative positions of the rotor 6b and the armature windings U, V, and W of the stator 6c based on the output signals of the three rotation position detection elements 7a, 7b, and 7c. Circuit. The rotation speed detection circuit 78 is a circuit that detects the motor rotation speed based on the number of detection signals from the rotor position detection circuit 77 counted within a unit time.

  The control signal output circuit 71 supplies a PWM signal to the power supply side transistors Q1 to Q6 based on the output from the calculation unit 72. By controlling the pulse width of the PWM signal, the number of rotations of the motor 6 in the rotation direction set by adjusting the power supplied to each armature winding U, V, W can be controlled. The notification lamp 37 and the on-lock switch 38 are electrically connected to the calculation unit 72.

  The control circuit unit 7 detects the rotational position of the motor 6 by the rotor position detection circuit 77, and outputs a drive signal at a predetermined voltage to the FET drive circuit 8 by the control signal output circuit 71, so that the motor 6 It can be stopped at the position. In the present embodiment, the calculation unit 72 stores the position when the current value of the current detection circuit 73 is equal to or less than a predetermined value C described later, and stops the motor 6 at that position. This position is the complete stop position.

  FIG. 8A shows a graph showing the positional relationship between the upper blade 41 and the lower blade 42 during operation, and FIG. 8B shows a graph showing the current value at the position of FIG. 8A. Here, the current detected by the current detection circuit 73 has a wave-like waveform as shown in FIG. 8B in a no-load state (a state in which a tree is not cut or the like). At position A, the current value is the lowest, as shown in FIG. 4B, and the back surfaces of the upper blade 41 and the lower blade 42 are completely exposed. At position B, the current value is the highest. The upper blade 41 and the lower blade 42 as shown in a) and (c) are mostly overlapped. In the present embodiment, the predetermined value when the motor 6 is stopped is set to C or less. When the current value is C, the complete stop position is a state where the upper blade 41 does not overlap the lower blade 42 on the tip side from half the full length of the blade height. In this embodiment, the rotational motion transmission mechanism 5 is provided between the output shaft 6A of the motor 6 and the eccentric cam 54, and the rotational speed of the motor 6 is reduced and transmitted to the eccentric cam 54. The phase of the current detected by the circuit 73 does not match the rotational speed of the output shaft 6A of the motor 6. Therefore, when the blade 4 is replaced or the like, the relationship between the rotational position of the output shaft 6A and the current value may change, and the correction described later is set by the correction function setting. The correction function setting works when the trigger 34 is first turned on after the battery 33 is mounted (first trigger ON).

  Next, the operation of the trimming machine 1 will be described. Electric power is supplied to the motor 6 by pulling the trigger 34. As a result, the output shaft 6A and the output gear 61 rotate, and the first gear 61 that meshes with the output shaft 6A rotates. Since the first gear 61 meshes with the second gear 63, the second gear 63 and the coaxial eccentric cam 54 also rotate. This state is referred to as a continuous operation state. By rotating the eccentric cam 54, the upper blade 51 and the lower blade 52 reciprocate, so that the upper blade 41 and the lower blade 42 sandwich the object to be cut to cut trees, turf, or the like.

  In the present embodiment, the control circuit unit 7 is operated during the pruning operation according to the flow shown in FIG. When the battery 33 is mounted, the control circuit unit 7 starts operating upon receiving power supply from the battery 33, and the lawn mower 1 enters a standby state (power ON). In the standby state, the rotation of the motor is started by turning on (pulling) the trigger (S1: YES, S2). When it is determined in S3 that correction is necessary (first trigger ON), correction function setting is started (S4 to S11). The correction function setting is for storing that the position of the blade 4 when the motor 6 is stopped is a position equal to or less than a predetermined value C.

  In the correction function setting, first, the complete stop position stored in S4 is reset, and the timer starts counting in S5 (in order to suppress the influence of the starting current, for example, 3 to 4 sec). . The correction function is set by detecting the current rising position A1 shown in FIG. 8B in the current detected by the current detection circuit 73 shown in FIG. The rotational position is stored (S6, S7). Next, it is determined whether or not the previous current rising position is stored (S8). As shown in FIG. 8B, since A1 is the first current rise position, the previous current rise position is not stored (S8: NO). When the predetermined time has not elapsed (S11: NO), the current rising position A2 is detected again (S6: YES), and the rotational position of the corresponding motor 6 is stored (S7). At this time, since the rising position of the previous current is stored as A1 (S8: YES), the calculation unit 72 calculates the rotational speed of the motor between the periods A1 and A2, and A3 after a predetermined rotation from A1. The rotational position of the motor 6 corresponding to A4 is stored (S9). A3 and A4 are positions where the current value is equal to or less than the predetermined value C. When the control circuit unit 7 stores the complete stop position, the notification lamp 37 is turned on, and the operator is left unattended that the correction function setting has been completed (S10). The processing from S6 to S11 is repeated until the timer elapses for a predetermined time. When the timer elapses for the predetermined time, the operation state is entered (after S12).

  In the practical operation state, the operator is actually cutting trees, turf, etc., and the calculation unit 72 has the current value from the current detection circuit 73 exceeded a preset value (overcurrent)? That is, it is determined whether or not the motor 6 exceeds the upper limit of the load torque (S12). If the load torque of the motor 6 does not exceed the upper limit (S12: YES), the rotation of the motor 6 is continued, and the operator can continue the practical operation. By turning off the trigger 34 (S13: OFF), the motor 6 stops at the complete stop position stored in S9 (S14, S15). In S14, when the control circuit unit 7 confirms that the motor 6 is at the position A3 based on the detection signal from the rotor position detection circuit 77, the control signal output circuit 71 starts the brake control, and Make sure to stop at the position.

  If the motor 6 exceeds the upper limit of the load torque (S12: NO), forced shut-off is started and the motor 6 is stopped (S15). Even if the on-lock switch 38 is pressed and the trigger 34 is held in the ON state, the rotation of the motor 6 is stopped by determining that the on-lock switch 38 is released and the trigger 34 is turned off. The motor 6 does not start rotating even if the trigger 34 continues to be pulled unless it is confirmed that the state where the trigger 34 has been pulled is actually released after the forced interruption. When the state where the trigger 34 is pulled is released, the standby state is entered, and the process returns to S1.

  According to the configuration as described above, since the motor 6 stops at a position where the current value of the motor 6 is equal to or less than the predetermined value C, the motor 6 stops at a position where the resistance between the upper blade 41 and the lower blade 42 is small. become. The position where the resistance is low is a position where there is little overlap between the upper blade 41 and the lower blade 42. At this position, the back surface of the upper blade 41 and the back surface of the lower blade 42 are exposed to each other. Thereby, the back surface of the upper blade 41 and the lower blade 42 can be easily cleaned. Moreover, since the upper blade 41 and the lower blade 42 are stopped in a state where they do not overlap with each other, it is possible to prevent foreign matter from getting caught between the upper blade 41 and the lower blade 42 when stopped.

  Further, according to the above-described configuration, it is possible to reliably stop the blade at the predetermined stop position by starting the brake control from the position A3 before A4 that is the complete stop position.

  Further, according to the above-described configuration, when the current value detected by the current sensor 72 exceeds the upper limit of the load torque (S12: NO), the control circuit unit 7 stops the rotation of the motor 6 so that the motor 6 due to overcurrent is stopped. Burnout can be prevented.

  Further, according to the configuration as described above, even when the on-lock switch 38 is pressed, when the current value of the motor 6 exceeds the set value, the on-lock switch 38 is released and the motor stops. Thereby, it is possible to prevent the motor 6 from being burned out due to an overcurrent when the on-lock switch 38 is pressed.

  Moreover, according to the above structure, the upper blade 41 and the lower blade 42 can be operated by a predetermined amount by finely moving the rotational motion transmission mechanism 5. As a result, even if the upper blade 41 and the lower blade 42 are stopped in a state where they overlap each other, the upper blade 41 and the lower blade 42 are operated by operating the upper blade 41 and the lower blade 42 by a predetermined amount. 42 can be shifted from each other to expose the back surfaces thereof, and foreign substances adhering to the back surfaces of the upper blade 41 and the lower blade 42 can be easily cleaned.

  Further, according to the above configuration, since the correction function setting is started when the power is turned on, the rotation position of the motor 6 when the current value of the motor 6 is a predetermined value is automatically set by pulling the trigger 34 for a predetermined time. Remember. As a result, even if the trimming machine 1 is disassembled and repaired and the positional relationship between the motor 6 and the upper blade 41 and the lower blade 42 is shifted, the upper blade 41 and the lower blade 42 do not overlap each other. While grasping the position again, the motor 6 can be stopped at that position. Thereby, the back surface of the upper blade 41 and the lower blade 42 can be easily cleaned.

  Further, according to the configuration as described above, when the control circuit unit 7 stores the complete stop position of the motor 6, the notification lamp 37 is turned on. Thereby, since the complete stop position is newly memorized for the operator, the positional relationship between the position of the motor 6 and the upper blade 41 and the lower blade 42 is eliminated, and the upper blade 41 and the lower blade 42 do not overlap each other. It can be confirmed that the vehicle stops at the position.

  Moreover, according to the above configuration, the life of the motor 6 can be extended by using a brushless motor for the motor 6.

  Further, according to the above configuration, even if the upper blade 41 and the lower blade 42 are overlapped due to an overcurrent or the like, the upper blade 41 and the lower blade 42 are shifted by operating the fine adjustment mechanism 56. be able to. Thereby, the back surface of the upper blade 41 and the lower blade 42 can be easily cleaned. In addition, since the motor 6 is not used to finely adjust the upper blade 41 and the lower blade 42, the positions of the upper blade 41 and the lower blade 42 can be adjusted even when power is not supplied.

  Further, according to the above-described configuration, the other end portion of the fine adjustment mechanism 56 is directly engaged with the first gear 51 of the rotational motion transmission mechanism 5 without any other member, thereby reducing the number of parts. At the same time, the manufacturing cost can be reduced. Further, since the fine adjustment mechanism 56 is disposed in the middle of the speed reducer, the upper blade 41 and the lower blade 42 can be finely adjusted with a small force.

  Next, a trimming machine 201 according to a second embodiment of the present invention will be described with reference to FIGS. Components having the same configuration are denoted by the same reference numerals and description thereof is omitted.

  In the trimming machine 201, the second handle portion 32 has a control board 235 inside the left end and a fine movement switch 236 electrically connected to the control board 235 outside the left end. By depressing fine movement switch 236, motor 6 is rotated in a predetermined direction by a small amount. This state is referred to as fine movement operation. The trace amount here means, for example, the amount of the upper blade 41 and the lower blade 42 from the state shown in FIG. 4A to the state shown in FIG. 4B. The rotation direction of the motor 6 during the fine operation is configured to be opposite to the rotation direction of the motor 6 during the continuous operation.

  When fine movement switch 236 is pressed, a signal for rotating motor 6 in a predetermined direction is output to control circuit unit 7. Upon receiving this signal, the control circuit unit 7 outputs a signal for rotating the motor 6 in a minute predetermined direction to the FET drive circuit unit 8 by the calculation of the calculating unit 72, and the motor 6 rotates in a minute predetermined direction. The predetermined direction here is a direction opposite to the direction set by the forward / reverse switching lever 79.

  Next, the operation of the trimming machine 201 will be described with reference to FIG. S1 to S15 are the same as in the first embodiment. The trimming machine 201 is in a standby state from when the power is turned on until S1 when the trigger is turned on, or when the load torque of the motor 6 exceeds the upper limit during practical operation and is forcibly cut off (S12: NO). Then, the process of the fine movement switch 236 is added in a state where the process returns to the standby state again and repeats the process of S1 (S201, S202). By turning ON (pressing down) fine movement switch 236 in the standby state described above (S201: YES), motor 6 is rotated by a certain angle in the opposite direction to the continuous operation state (S202). Thereby, the upper blade 41 and the lower blade 42 finely move in the direction opposite to the continuous operation state. When the fine movement switch 236 is OFF (not pressed) (S201: NO), it returns to the standby state. The practical operation can be performed again by pulling the trigger 34 after the fine operation (S201: YES). If further fine movement operation is desired, fine movement operation can be performed again by turning on the fine movement switch 236 without pulling a trigger (S1: NO) (S201: YES).

  According to the configuration as described above, it is possible to slightly move the rotational motion transmission mechanism 5 with a simple structure of rotation control of the motor 6 and to displace the upper blade 41 and the lower blade 42 from each other to expose the respective back surfaces. Moreover, the foreign material adhering to the back surfaces of the upper blade 41 and the lower blade 42 can be easily cleaned.

  Further, according to the above-described configuration, when a foreign object is caught between the upper blade 41 and the lower blade 42, the motor 6 is rotated by a small amount in the direction opposite to the continuous operation by pressing the fine movement switch 236, While preventing the foreign matter from further biting, the foreign matter can be easily removed without applying a load to the upper blade 41 and the lower blade 42.

  About the trimming machine of this invention, it is not limited to the above-mentioned embodiment, A various deformation | transformation and improvement are possible in the range described in the claim.

  For example, in the present invention, power is supplied by attaching a battery, but power may be supplied by a power cord. In that case, S1 in FIG. 1 determines whether or not the power cord is connected, and correction function setting is started. Further, the correction function setting may be started when a power switch is separately provided and turned on. Alternatively, a switch for setting the correction function may be provided separately, and the correction function setting may be started when this switch is pressed.

  In the present invention, the rotational position of the motor at the lower limit current at which the back side of the upper blade and the back side of the lower blade are completely exposed as shown in FIG. As long as the position does not overlap with more than half of the blade height, the complete stop position may be set to any position below the predetermined value C.

  In the present invention, the amount of movement of the upper blade and the lower blade by the fine adjustment mechanism and the fine movement switch is the amount of movement from FIG. 4A to FIG. 4B, but the amount of movement may be further reduced. Thereby, the position of an upper blade and a lower blade can be adjusted in detail.

  In the present invention, both the upper blade and the lower blade are driven by the eccentric cam. However, one of the upper blade and the lower blade is driven, and the corresponding upper blade or lower blade is fixed to the main body. It may be a thing. In addition, the trimming machine has been described with respect to a method in which the upper blade and the lower blade are reciprocally driven in the left-right direction to perform cutting by sliding, but a plurality of cutting blades are formed along both edges in the width direction of the base portion extending in the front-rear direction. May be formed, and a form such as a so-called hedge trimmer in which the upper blade and the lower blade are slid together by being reciprocated in the front-rear direction may be used. Further, in the present invention, the upper blade and the lower blade are finely moved by the fine adjustment mechanism and the fine movement switch. However, in the above-described one-blade drive trimming machine, either the upper blade or the lower blade may be finely moved.

  In the present invention, when the correction function setting is completed, the notification lamp is turned on for a predetermined time. However, the correction function is set only when the notification lamp is turned on for a predetermined time when the power is turned on and the trigger is turned on for a predetermined time. You may start. Thereby, the correction function setting can be started only when necessary.

  In the present invention, when the load torque of the motor exceeds the upper limit, the motor is stopped and fine movement operation is performed only when the fine movement switch is pressed. However, when the load torque of the motor exceeds the upper limit, the motor stops and automatically moves finely. You may make it drive | work. Further, the fine movement operation at this time may be forward rotation or reverse rotation.

  In the present invention, the rotational position of the motor when the motor current value is equal to or less than the predetermined value is stored, but the motor current value may be stored. By doing so, even if the positional relationship between the motor position and the upper and lower blades changes due to disassembly, etc., the positional relationship between the current value and the upper and lower blades does not change, so the correction function is set. There is no need.

  In the present invention, when the load torque of the motor exceeds the upper limit, the rotation of the motor is forcibly stopped. However, even if the rotation of the motor is forcibly stopped, the motor is stopped at the complete stop position. It may be configured.

  Further, the trimming machine of the present invention includes both a control circuit for stopping at the complete stop position when continuous operation is stopped, and a fine adjustment mechanism or a fine adjustment switch that enables fine movement of the upper blade and the lower blade. Only one of them may be provided in the trimming machine.

  In the present invention, the complete stop position is detected from the current rising position. However, the current falling positions B1 and B2 shown in the lower part of FIG. The motor rotational speed may be measured, and the brake control may be started before the rotational speed reaches the stop position B4 from the falling position.

  In setting the complete stop position of the motor 6, the stop position is detected from the current of the motor 6. However, the position of the blade 4 may be detected by providing a limit switch or the like on an eccentric cam. good. In such an example, a correction switch (stop position correction) is separately provided, and the stop position is corrected when the motor is started while the correction switch is pressed, so that the limit switch is moved from the rotation start position of the motor 6. It is possible to correct the complete stop position by measuring the number of ON / OFF rotations, and it is possible to perform correction at an arbitrary timing.

  Further, in setting the complete stop position of the motor 6, the setting of the stop position of the calculation unit 72 is not changed, and the motor 6 and the rotary motion transmission mechanism 5 are not operated when the fine adjustment mechanism 56 shown in the first embodiment is operated. The connection may be released. In such an example, by operating the fine adjustment mechanism 56 after the motor 6 is stopped at the complete stop position so that the blades do not overlap with each other, the complete stop position can be corrected as a result. . Further, when the fine movement switch 236 is provided as in the second embodiment, for example, a correction switch is provided separately, and the motor 6 is finely operated while pressing the correction switch, so that the complete stop position can be corrected. good.

  In the present invention, the upper blade and the lower blade are finely moved by the fine adjustment mechanism and the fine movement switch. However, at least one of the upper blade and the lower blade may be finely moved.

  2: housing, 6: motor, 4: blade, 5: rotational motion transmission mechanism, 7, 207: control circuit, 34: trigger, 37: notification lamp, 41: upper blade, 42: lower blade, 51: first gear 53: Second gear 54: Eccentric cam 56: Fine adjustment mechanism 72: Current sensor 236: Fine adjustment switch

Claims (10)

A housing;
A motor housed in the housing;
A rotational motion transmission mechanism for converting the rotational motion of the motor into a reciprocating motion;
A pair of upper and lower blades extending from the housing and at least one of which is reciprocally driven by the motor via the rotational motion transmission mechanism;
And a control means for stopping the upper blade and the lower blade in a predetermined positional relationship when the motor enters a stopped state from the operating state.   2. The trimming machine according to claim 1, wherein the predetermined positional relationship between the upper blade and the lower blade is such that the lower blade does not overlap the tip side with respect to half of the total length of the upper blade. . A motor current detector for detecting the current value of the motor;
The control means is connected to the motor and the motor current detector, and when the motor enters a stop state from an operating state, the motor when the current detected by the motor current detector becomes a predetermined value or less. The trimming machine according to claim 1 or 2, wherein the motor is stopped at the rotational position of the motor.   The trimming machine according to claim 3, further comprising correction means capable of correcting a predetermined positional relationship between the upper blade and the lower blade stored in the control means.   A trigger for selectively switching power supply to and cutoff of the motor; and when the motor is pulled in a no-load state for a predetermined time, the control means sets a lower limit current value of the motor current value. The mowing machine according to claim 3 or 4, wherein the motor is stopped at the position of the lower limit current value when the motor enters a stop state from an operating state.   A notification unit connected to the control unit and capable of selectively switching between lighting and extinguishing, and the reporting unit is turned on when the control unit stores the lower limit current value of the current value of the motor; The trimming machine according to claim 5.   The trimming machine according to any one of claims 3 to 6, wherein when the current value detected by the motor current detector exceeds a set value, the control means stops the rotation of the motor.   The trimming machine according to any one of claims 1 to 7, further comprising fine movement means for finely moving the rotational movement transmission mechanism.   One end protrudes from the housing, and the other end has a fine adjustment mechanism that can be engaged with the rotational motion transmission mechanism and that can operate the rotational motion transmission mechanism by operating the one end. The trimming machine according to claim 8. The trimming machine according to any one of claims 1 to 9, wherein the motor is a brushless motor.

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