JP2020093460A - Reciprocating work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating operation machine capable of reducing power consumption. SOLUTION: A control unit of a reciprocating operation machine has an energy saving mode, and in the energy saving mode, a voltage of a first effective value is used as a motor during a first period during one reciprocating operation of an upper blade 7 and a lower blade 8. During the second period during one reciprocating operation of the upper blade 7 and the lower blade 8, a voltage having a second effective value lower than the first effective value is applied to the motor. The first period includes a working period in which the mating material is sandwiched between the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 for cutting. The second period is at least a part of a non-working period in which the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 overlap each other and there is no mating material sandwiched between the blade portions 7b and 8b. The second period is determined so as not to overlap with the working period. [Selection diagram] Fig. 3

Description

The present invention relates to a reciprocating operation machine such as a hedge trimmer.

The following Patent Document 1 discloses a hedge trimmer that operates with electric power of a battery pack that is detachably mounted.

JP 2014-136297 JP

In a reciprocating machine such as a hedge trimmer, the tip tool does not work on a mating material for a predetermined period during one reciprocating movement of the tip tool. While the tip tool is working on the mating material, a load is applied to the mating material by the mating material, and therefore the motor also requires a predetermined torque. On the other hand, when the tip tool is not working on the mating material, the load from the mating material is not applied to the tip tool, so that the motor does not need to have a large torque, and the minimum amount for reciprocating the tip tool is required. Having a torque is enough. Therefore, during the entire reciprocating motion of the tip tool, if the tip tool supplies a voltage to the motor to obtain the torque required to perform the work on the mating material, the tip tool will work on the mating material. The power supply to the motor was unnecessarily large during the non-use period.

The present invention has been made in view of such a situation, and an object thereof is to provide a reciprocating operation machine capable of reducing power consumption.

One aspect of the present invention is a reciprocating machine. This reciprocating machine is
A motor having an output shaft,
A tip tool driven by the motor and capable of performing work on a mating material,
A power conversion mechanism that converts the rotational force of the output shaft into reciprocating power and transmits it to the tip tool,
A control unit for controlling the drive of the motor,
The control unit has a first mode, and in the first mode,
During a first period during one reciprocating motion of the tip tool, a voltage having a first effective value is applied to the motor,
During a second period during one reciprocating motion of the tip tool, a voltage having a second effective value lower than the first effective value is applied to the motor.

The controller may determine the first and second periods based on the position of the tip tool in the reciprocating direction.

A position detecting means for detecting the position of the tip tool in the reciprocating direction,
The control unit may determine the first and second periods based on a detection result of the position detection unit.

The position detecting means may be a load detecting means for detecting a load applied to the motor.

In the third period during one reciprocating motion of the tip tool, the motor causes a load to increase as the tip tool works on the mating material,
The control unit may determine the second period so as not to overlap with the third period.

The control unit has a second mode, and in the second mode, a voltage of a third effective value higher than the second effective value is applied to the motor in all the periods during one reciprocating operation of the tip tool. You may apply.

The control unit may shift to the second mode when the load applied to the motor in the first mode becomes a predetermined value or more.

The tip tool may have first and second blades that reciprocate relative to each other, and the mating material may be cut by sandwiching the mating material between the first and second blades.

In the one reciprocating motion of the tip tool, the control unit may set at least a part of a period in which the first and second blades overlap each other as the second period, and may set a period other than the second period as the first period. Good.

The second period may be greater than 1/10 and less than 1/2 of the period required for one reciprocating motion of the tip tool.

The reciprocating operation machine may operate on the power of a battery pack.

It should be noted that any combination of the above constituent elements and one obtained by converting the expression of the present invention between methods and systems are also effective as an aspect of the present invention.

According to the present invention, it is possible to provide a reciprocating operation machine capable of reducing power consumption.

1 is a side sectional view of a reciprocating operation machine 1A according to Embodiment 1 of the present invention. The circuit block diagram of reciprocating operation machine 1A. Explanatory drawing of the rotational position of the cam mechanism 6, the reciprocating position of the upper blade 7 and the lower blade 8 corresponding to it, and the effective value of the voltage applied to the motor 5 in the energy saving mode of the reciprocating operation machine 1A. Explanatory drawing of the front-back direction position of the upper blade 7 and the lower blade 8, the no-load current, the working current, and the time change of the duty ratio of the drive signal of the inverter circuit 80 in the normal mode of the reciprocating machine 1A. Explanatory drawing of the time change of the front-back direction position of the upper blade 7 and the lower blade 8 and the duty ratio of the drive signal of the inverter circuit 80 in the energy saving mode of 1 A of reciprocating operation machines. The control flowchart of reciprocating operation machine 1A. The control flowchart of reciprocating operation machine 1A when it has an energy saving drive cancellation function. The side sectional view of reciprocating operation machine 1B according to Embodiment 2 of the present invention. The control flowchart of reciprocating operation machine 1B. The side sectional view of reciprocating operation machine 1C according to Embodiment 3 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, processes and the like shown in each drawing are denoted by the same reference numerals, and duplicated description will be omitted as appropriate. In addition, the embodiments do not limit the invention, but are exemplifications, and all features and combinations described in the embodiments are not necessarily essential to the invention.

(Embodiment 1)
A reciprocating operation machine 1A according to Embodiment 1 of the present invention will be described with reference to FIGS. The front-back and up-down directions orthogonal to each other are defined by FIG. As shown in FIG. 1, the reciprocating operation machine 1A is a cordless type hedge trimmer, and operates with power supplied from a battery pack 10 detachably attached to the rear end of the housing 3.

The reciprocating operation machine 1A is driven by the motor 5 serving as a drive source, a speed reduction mechanism 9 for reducing the rotation of the output shaft 5a of the motor 5, and the motor 5 via the speed reduction mechanism 9 in the resin housing 3, for example. And a cam mechanism 6 that is operated. The drive shafts of the motor 5, the speed reduction mechanism 9 and the cam mechanism 6 are all parallel to the vertical direction. The drive shaft 6a of the cam mechanism 6 is provided with a rotary encoder 17 as position detecting means. The rotary encoder 17 detects the rotational position of the cam mechanism 6. The cam mechanism 6 has an upper cam 6b and a lower cam 6c. The upper cam 6b and the lower cam 6c differ by 180 degrees in the position around the drive shaft 6a in the axial direction.

The upper blade 7 and the lower blade 8 as tip tools engage with the cam mechanism 6 and extend forward from the lower end of the housing 3. The upper blade 7 engages with the upper cam 6b, and the lower blade 8 engages with the lower cam 6c. The cam mechanism 6 is a power conversion mechanism that converts the rotation of the motor 5 into the reciprocating motion of the upper blade 7 and the lower blade 8. By engaging with the cam mechanism 6, the upper blade 7 and the lower blade 8 reciprocate so that they are in opposite phases. Since the mechanical structure and operation from the rotation of the motor 5 to the reciprocating motion of the upper blade 7 and the lower blade 8 are well known, further detailed description will be omitted.

The housing 3 includes a drive mechanism accommodating portion 3a that accommodates a drive mechanism such as the motor 5, the speed reduction mechanism 9, and the cam mechanism 6, and a handle portion (grasping portion) 3b that extends rearward from the upper end of the drive mechanism accommodating portion 3a. Have. The control board 20 is provided at a position behind the motor 5 in the drive mechanism housing portion 3a. The control board 20 has a control circuit section (control section) 70 shown in FIG. The handle portion 3b is a main handle (rear handle). A sub handle (front handle) 4 is provided at the front of the housing 3. A switch trigger 11 and a switch panel 15 are provided on the handle portion 3b. The switch trigger 11 is an operation unit for an operator to switch between driving and stopping the motor 5. The switch panel 15 is a mode switching unit (mode switching switch) for an operator to switch between a normal mode and an energy saving mode described later.

FIG. 2 is a circuit block diagram of the reciprocating operation machine 1A. The motor 5 is an inner rotor type brushless motor, and includes a rotor (magnet rotor) 5b configured by embedding a permanent magnet (magnet) including a pair of N poles and S poles in a rotor core, and rotational position detection. A stator winding 5d composed of three-phase windings U, V, W of a star-connected stator 5c which is controlled in a current-carrying section of an electric angle of 120° based on position detection signals from the elements 81 to 83; , With. The three rotational position detecting elements (Hall ICs) 81 to 83 are arranged every 60° in order to detect the rotational position of the magnet rotor 5b.

The inverter circuit 80 is composed of six FETs (hereinafter referred to as “transistors”) Q1 to Q6 connected in a three-phase bridge form. The gates of the six bridge-connected transistors Q1 to Q6 are connected to the control signal output circuit 71, and the sources or drains of the six transistors Q1 to Q6 are star-connected three-phase 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 pack 10 applied to the inverter circuit 80 is transferred to the three-phase winding U. , V, W.

The control circuit unit 70 includes a control signal output circuit 71, a calculation unit 72, a current detection circuit 73 as load detection means, 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 circuit 78. The arithmetic unit 72 includes a CPU for outputting a drive signal based on a processing program and data, a ROM for storing programs and control data corresponding to a flowchart described later, a RAM for temporarily storing data, a timer, and the like. It is configured by, for example, a microcomputer (micro controller). The current detection circuit 73 is a circuit for detecting the motor current by the voltage across the resistor Rs provided in the path of the current flowing in the motor 5 (hereinafter also referred to as “motor current”), and the detected value of the motor current is It is input to the calculation unit 72.

The switch operation detection circuit 74 is a circuit that detects the operation of the switch trigger 11. The applied voltage setting circuit 75 sets the applied voltage to the motor 5, that is, the duty ratio of the drive signal (PWM signal) of the inverter circuit 80 (hereinafter also simply referred to as “duty ratio”) in response to the pulling amount of the switch trigger 11. It is a circuit for doing. The rotation direction setting circuit 76 is a circuit for setting the rotation direction of the motor 5 by detecting an operation of forward rotation or reverse rotation by the forward/reverse switching lever 79 of the motor 5.

The rotor position detection circuit 77 is a circuit for detecting a relational position between the three-phase windings U, V, W of the rotor 5b and the stator 5c based on the output signals of the three rotation position detection elements 81 to 83. Is. 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 transistors Q1 to Q6 based on the output from the arithmetic unit 72. By controlling the pulse width of the PWM signal, the effective value of the voltage supplied to each of the three-phase windings U, V, W can be adjusted to control the rotation speed of the motor 5 in the set rotation direction. The switch panel 15, the rotary encoder 17, and the on-lock switch 38 are electrically connected to the arithmetic unit 72.

FIG. 3 is an explanatory diagram of the rotational position of the cam mechanism 6, the corresponding reciprocating positions of the upper blade 7 and the lower blade 8 and the effective value of the voltage applied to the motor 5 in the energy saving mode of the reciprocating machine 1A. Is. The upper blade 7 has a base portion 7a extending in the front-rear direction, and a blade portion 7b as a first blade portion protruding from the base portion 7a on both left and right sides. The lower blade 8 has a base portion 8a extending in the front-rear direction, and a blade portion 8b as a second blade portion protruding from the base portion 8a on both left and right sides. A state in which the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 overlap each other is defined as a state in which the upper blade 7 and the lower blade 8 overlap.

At 0° on the horizontal axis of FIG. 3 (rotational position 0° of the cam mechanism 6), the upper cam 6b and the upper blade 7 are at the most advanced position, and the lower cam 6c and the lower blade 8 are at the most retracted position. At this time, the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 completely overlap each other. As the cam mechanism 6 rotates from here, the upper cam 6b and the upper blade 7 retreat and the lower cam 6c and the lower end 8 move forward until the cam mechanism 6 rotates 180°. At the rotational position of 180° of the cam mechanism 6, the upper cam 6b and the upper blade 7 are at the most retracted positions, and the lower cam 6c and the lower blade 8 are at the most advanced position. At this time, the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 completely overlap each other.

The hatched portion shown on the right side of the base portion 7a of the upper blade 7 and the base portion 8a of the lower blade 8 in FIG. 3 indicates a mating member to be cut. Although illustration is omitted, there is a mating member to be similarly cut on the left side of the bases 7a and 8a. In the example of FIG. 3, during the period in which the rotational position of the cam mechanism 6 reaches from 0° to 135°, the mating member is sandwiched between the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 and cut. It is a third period (hereinafter also referred to as “working period”) that is present, and is an example of the first period during one reciprocating operation of the upper blade 7 and the lower blade 8. During the period in which the rotational position of the cam mechanism 6 reaches from 135° to 180°, the blade 7b of the upper blade 7 and the blade 8b of the lower blade 8 overlap each other and are sandwiched between the blades 7b, 8b. Is a period (hereinafter also referred to as a “non-working period”) in which there is not, and is an example of a second period during one reciprocating motion of the upper blade 7 and the lower blade 8. Although illustration is omitted, the period in which the rotational position of the cam mechanism 6 reaches 180° to 315° is an example of the first period, similarly to the period from 0° to 135°. The period until the rotational position of the cam mechanism 6 reaches 315° to 360° (0°) is an example of the second period, as is the period from 135° to 180°.

During the working period, since the mating material is sandwiched between the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 to cut, the upper material 7 and the lower blade 8 are loaded by the mating material. Therefore, the motor 5 also requires a predetermined torque. On the other hand, in the non-working period, the load on the upper blade 7 and the lower blade 8 from the mating material is not applied, so the torque required for the motor 5 is small and the minimum torque that does not stop the reciprocating motion of the upper blade 7 and the lower blade 8. Is enough. Therefore, the voltage is supplied to the motor 5 so that the upper blade 7 and the lower blade 8 can obtain the torque necessary for performing work on the mating material during the entire reciprocating operation of the upper blade 7 and the lower blade 8. Then, the power supply to the motor 5 unnecessarily increases during the non-working period when the upper blade 7 and the lower blade 8 are not working on the mating material.

In the present embodiment, the control circuit unit 70 has an energy saving mode (energy saving mode) as a first mode and a normal mode as a second mode. In the energy saving mode, the control circuit unit 70 supplies the voltage V1 of the first effective value to the motor 5 for the first period (which corresponds to the working period in the example of FIG. 3) during one reciprocating operation of the upper blade 7 and the lower blade 8. During the second period (which corresponds to the non-working period in the example of FIG. 3) during one reciprocating motion of the upper blade 7 and the lower blade 8, the voltage V2 of the second effective value lower than the first effective value is applied to the motor 5 Apply to. The control circuit unit 70 changes the effective value of the voltage applied to the motor 5 by changing the duty ratio of the PWM control of the inverter circuit 80, for example. The voltage V1 is, for example, an effective value voltage corresponding to a duty ratio of 100% (maximum duty ratio). The voltage V2 may be 0 V, or may be a voltage having an effective value corresponding to an arbitrary duty ratio of 80% or less. The control circuit unit 70 detects the rotational position of the cam mechanism 6, that is, the positional information of the upper blade 7 and the lower blade 8 based on the output signal of the rotary encoder 17, and determines the first and second periods. The first period may include the entire work period and may include a part of the non-work period. The second period may be limited to a part of the non-working period and does not have to overlap with the working period. The second period is longer than 1/10 and smaller than 1/2 of the period required for one reciprocating motion of the upper blade 7 and the lower blade 8. In the normal mode, the control circuit unit 70 applies the voltage V3 having the third effective value to the motor 5 during the entire reciprocating operation of the upper blade 7 and the lower blade 8. It may be V1=V3.

FIG. 4 is an explanatory diagram of changes in the longitudinal positions of the upper blade 7 and the lower blade 8, the no-load current, the working current, and the duty ratio of the drive signal of the inverter circuit 80 with time in the normal mode of the reciprocating operation machine 1A. Is. The positions of the upper blade 7 and the lower blade 8 change in the front-rear direction in a sine wave shape by the rotation of the cam mechanism 6. The no-load current is the motor current when the motor 5 is rotated in the absence of the mating material. The period in which the no-load current is high is a period in which the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 overlap with each other, and the blade portion 7b of the upper blade 7 and the blade portion of the lower blade 8 overlap. This is a period during which the load of the motor 5 is high due to the frictional force between the motor 5 and 8b. The working current is a motor current when the motor 5 is rotated to cut the mating material. The working current greatly increases when a load for cutting the mating material is applied. Because of the normal mode, the duty ratio of the PWM control of the inverter circuit 80 is constant at 100%.

FIG. 5 is an explanatory diagram of temporal changes in the longitudinal positions of the upper blade 7 and the lower blade 8 and the duty ratio of the drive signal of the inverter circuit 80 in the energy saving mode of the reciprocating operation machine 1A. As shown in FIG. 5, in the energy saving mode, the duty ratio of PWM control is 80 during the period corresponding to the front-back direction positions of the upper blade 7 and the lower blade 8 when the working current is low in the normal mode of FIG. It has been reduced to %. The duty ratio of the PWM control in the other periods is 100%, which is the same as in the normal mode.

FIG. 6 is a control flowchart of the reciprocating operation machine 1A. The calculation unit 72 confirms the current mode based on the state of the switch panel 15 (S1). If it is the normal mode (Yes in S1), the calculation unit 72 sets the operation mode to the normal mode (S3). When the switch trigger 11 is turned on (Yes in S5), the calculation unit 72 normally drives the motor 5 (S7). In normal driving, the duty ratio is set to 100%, for example, during the entire reciprocating operation of the upper blade 7 and the lower blade 8. When the switch trigger 11 is turned off (No in S9), the calculation unit 72 stops the motor 5 (S11) and returns to step S1. In the case of the energy saving mode (No in S1), the calculation unit 72 sets the operation mode to the energy saving mode (S13). When the switch trigger 11 is turned on (Yes in S15), the calculation unit 72 drives the motor 5 to save energy (S17). In the energy-saving drive, the duty ratio is, for example, 100% in the first period during one reciprocating operation of the upper blade 7 and the lower blade 8, and the duty ratio is, for example, 80% or less in the second period. When the switch trigger 11 is turned off (No in S19), the calculation unit 72 stops the motor 5 (S21) and returns to step S1.

FIG. 7 is a control flowchart of the reciprocating operation machine 1A having the energy saving drive cancel function. Compared to that in FIG. 6, this flowchart automatically shifts to the normal drive (S7) when the motor current exceeding the threshold value occurs in the energy saving drive (S17) (Yes in S18) (temporarily the normal mode). Point) and the other points are the same. When high-load work is required depending on the type and condition of the mating material, workability may be reduced with energy-saving drive. Therefore, in the control example of FIG. 7, energy-saving drive is used for high-load work in which the motor current exceeds a threshold value. Cancel and resume normal drive.

According to this embodiment, the following effects can be obtained.

(1) The control circuit unit 70 has an energy saving mode. In the energy saving mode, the first effective value voltage V1 is applied to the motor 5 during the first period during one reciprocating operation of the upper blade 7 and the lower blade 8, During the second period during one reciprocating motion of the upper blade 7 and the lower blade 8, the voltage V2 having the second effective value lower than the first effective value is applied to the motor 5. Therefore, the power consumption can be reduced as compared with the case where the voltage V1 having the first effective value is applied to the motor 5 during the entire reciprocating operation of the upper blade 7 and the lower blade 8.

(2) The second period is a period in which the load applied to the upper blade 7 and the lower blade 8 by the mating member is not applied and the torque required for the motor 5 is small. Therefore, even if the effective value of the voltage applied to the motor 5 in the second period is decreased as compared with that in the first period, there is almost no adverse effect on workability with respect to the mating material. Therefore, it is possible to reduce power consumption while ensuring sufficient workability with respect to the mating material.

(3) When the control circuit unit 70 has the energy-saving drive cancel function described in FIG. 7, it is possible to prevent workability from deteriorating due to the energy-saving mode in high-load work.

(Embodiment 2)
FIG. 8 is a side sectional view of a reciprocating operation machine 1B according to the second embodiment of the present invention. The differences from the first embodiment will be mainly described below. The reciprocating machine 1B does not have the rotary encoder 17 unlike the one in the first embodiment shown in FIG. The calculation unit 72 detects the rotational position of the cam mechanism 6 by the load applied to the motor 5. Specifically, the calculation unit 72 detects the rotational position of the cam mechanism 6 based on the motor current (load current). As shown in FIG. 4, the no-load current increases when the blade portion 7b of the upper blade 7 and the blade portion 8b of the lower blade 8 overlap each other. The first and second time periods can be identified and determined.

FIG. 9 is a control flowchart of the reciprocating operation machine 1B. In the flowchart of FIG. 9, the control in the normal mode (Yes in S1) is the same as that in FIG. In the storage mode (No in S1 and Yes in S31), the calculation unit 72 sets the operation mode to the storage mode (S33). The storage mode is a mode for performing no-load operation and storing the first and second periods with no-load current. The operator can switch between the normal mode, the storage mode, and the energy saving mode by operating the switch panel 15. When the switch trigger 11 is turned on (Yes in S35), the calculation unit 72 normally drives the motor 5 (S37). The calculation unit 72 detects the motor current in the no-load operation (S39), and stores the set values for the first and second periods based on the detected value (S41). When the switch trigger 11 is turned off (No in S43), the calculation unit 72 stops the motor 5 (S45) and returns to step S1.

Control in the energy saving mode (No in S1 and No in S31) is performed when there is no set value for the first and second periods after the switch trigger 11 is turned on (Yes in S15) as compared with FIG. 6 (S16). No), the difference is that the drive automatically shifts to the normal drive (S7), and the other points are the same. The other points of the present embodiment are the same as those of the first embodiment. This embodiment can also achieve the same effect as that of the first embodiment.

(Embodiment 3)
FIG. 10 is a side sectional view of a reciprocating operation machine 1C according to the third embodiment of the present invention. The reciprocating machine 1C is a saver saw, and the rotation of the intermediate shaft 14 that rotates integrally with the output shaft 5a of the motor 5 is reduced by the reduction mechanism 9 and the cam mechanism 6 driven by the motor 5 through the reduction mechanism 9. The blade 12 reciprocates. The reciprocating operation machine 1C operates by AC power supplied via a power cord 13 connectable to an external AC power supply. The reciprocating operation machine 1C may be a cordless type in which a battery pack is detachably mounted and is operated by the power of the battery pack. The blade 12 cuts the mating material when retracted, and does not cut the mating material when moving forward. In the present embodiment as well, the same control as in the second embodiment can reduce power consumption while ensuring sufficient workability with respect to the mating material. Alternatively, also in the present embodiment, by providing the drive shaft rotary encoder of the cam mechanism 6, it is possible to reduce power consumption while ensuring sufficient workability with respect to the mating material by the same control as in the first embodiment. it can.

Although the present invention has been described with the embodiment as an example, it will be understood by those skilled in the art that various modifications can be made to each component and each process of the embodiment within the scope of the claims. By the way. Although the first and second embodiments have described the example in which both the upper blade 7 and the lower blade 8 reciprocate, only one of the upper blade 7 and the lower blade 8 reciprocates, and the other may be fixed. .. The reciprocating machine according to the present invention is not limited to the hedge trimmer and saver saw illustrated in the embodiment, and may be other types such as lawn clippers.

1A, 1B, 1C reciprocating machine, 3 housing, 3a drive mechanism accommodating section, 3b handle section (grasping section), 4 sub handle (front handle), 5 motor, 5a output shaft, 5b rotor (magnet rotor), 5c stator, 5d stator winding, 6 cam mechanism (reciprocating motion converting mechanism), 6a drive shaft, 6b upper cam, 6c lower cam, 7 upper blade, 7a base portion, 7b blade portion, 8 lower blade, 8a base portion, 8b Blade part, 10 Battery pack, 11 Trigger (operation part), 12 Blade, 13 Power cord, 14 Intermediate shaft, 15 Switch panel (mode switching part), 17 Rotary encoder (position detection means), 20 1st control board, 70 control circuit section, 71 control signal output circuit, 72 arithmetic section, 73 current detection circuit, 74 switch operation detection circuit, 75 applied voltage setting circuit, 76 rotation direction setting circuit, 77 rotor position detection circuit, 78 rotation speed detection circuit , 80 inverter circuit, 81-83 rotational position detection element

Claims (11)

A motor having an output shaft,
A tip tool driven by the motor and capable of performing work on a mating material,
A power conversion mechanism that converts the rotational force of the output shaft into reciprocating power and transmits it to the tip tool,
A control unit for controlling the drive of the motor,
The control unit has a first mode, and in the first mode,
During a first period during one reciprocating motion of the tip tool, a voltage having a first effective value is applied to the motor,
A reciprocating operation machine that applies a voltage having a second effective value lower than the first effective value to the motor during a second period during one reciprocating operation of the tip tool. The reciprocating operation machine, wherein the control unit determines the first and second periods based on the position of the tip tool in the reciprocating direction. A position detecting means for detecting the position of the tip tool in the reciprocating direction,
The reciprocating operation machine according to claim 2, wherein the control unit determines the first and second periods based on a detection result of the position detection unit. The reciprocating operation machine according to claim 3, wherein the position detection unit is a load detection unit that detects a load applied to the motor. In the third period during one reciprocating motion of the tip tool, the motor causes a load to increase as the tip tool works on the mating material,
The reciprocating machine according to any one of claims 2 to 4, wherein the control unit determines the second period so as not to overlap with the third period. The control unit has a second mode, and in the second mode, a voltage of a third effective value higher than the second effective value is applied to the motor in all the periods during one reciprocating operation of the tip tool. The reciprocating motion machine according to claim 1, wherein the reciprocating motion machine is applied. The reciprocating machine according to claim 6, wherein the control unit shifts to the second mode when the load applied to the motor in the first mode becomes equal to or more than a predetermined value. The said tip tool has a 1st and 2nd blade part which reciprocates relative to each other, and cuts a partner material by pinching a partner material between said 1st and 2nd blade parts. The reciprocating motion machine according to any one of 1 to 7. In one reciprocating motion of the tip tool, the control unit sets at least a part of a period in which the first and second blades overlap each other as the second period, and sets a period other than the second period as the first period. The reciprocating operation machine according to claim 8. The reciprocating machine according to any one of claims 1 to 9, wherein the second period is larger than 1/10 and smaller than 1/2 of a period required for one reciprocating operation of the tip tool. The reciprocating operation machine according to any one of claims 1 to 10, which operates with the power of a battery pack.

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