公开(公告)号：US10780563B2

公开(公告)日：2020-09-22

申请号：US15724766

申请日：2017-10-04

Applicant: MAKITA CORPORATION

Inventor： Yoshitaka Ichikawa ,  Hirokatsu Yamamoto ,  Ryo Umemoto ,  Kunihisa Shima

IPC: B25D16/00 ,  B25D17/24 ,  B25D17/04

Abstract: An electric power tool according to one aspect of the present disclosure includes a main body, a motor, a tool holder configured to hold a tool bit, a hammer, a motion converter, a rotation transmitter, a first load detector, a second load detector, and a motor controller. The first load detector detects, based on information indicating a drive state of the motor, a load imposed from a work piece to the tool bit. The second load detector detects, based on information indicating a behavior of the main body, a load imposed from the work piece to the tool bit. The motor controller sets an upper limit of rotational speed of the motor to a predetermined no-load rotational speed in response to no-load on the tool bit being detected by both the first load detector and the second load detector.

公开(公告)号：US10592151B2

公开(公告)日：2020-03-17

申请号：US15244130

申请日：2016-08-23

Applicant: MAKITA CORPORATION

Inventor： Hirokatsu Yamamoto ,  Yoshitaka Ichikawa

IPC: G06F3/06 ,  G06F12/0868 ,  B25C1/08 ,  B25F5/00 ,  G05B19/042

Abstract: A work apparatus in one aspect of the present disclosure comprises a control unit, a volatile memory and a rewritable non-volatile memory. The control unit comprises an update processing unit and a writing processing unit. The writing processing unit writes history information in the volatile memory into the non-volatile memory when the writing processing unit predicts a suspension of supply of an electric power to the control unit.

公开(公告)号：US09737984B2

公开(公告)日：2017-08-22

申请号：US14534418

申请日：2014-11-06

Applicant: MAKITA CORPORATION

Inventor： Hirokatsu Yamamoto ,  Takaaki Osada ,  Manabu Sugimoto

IPC: B25B23/147 ,  B25F5/00 ,  B25B21/00 ,  B23B45/00 ,  B25B23/14 ,  B25B23/00

CPC classification number: B25F5/001 ,  B23B45/008 ,  B25B21/008 ,  B25B23/0064 ,  B25B23/141 ,  B25B23/147

Abstract: It is an object of the invention to provide a technique for enhancing the operability of a power tool.A representative screwdriver 100 is provided which has a motor 110 and a driving mechanism 120. The driving mechanism 120 has a rotation transmitting mechanism including a driving cam 137 and a driven cam 157, and a cam engagement state is switched by movement of the spindle 150 in a longitudinal direction of the spindle. The position of the spindle 150 in the longitudinal direction is detected by a detecting mechanism 162 that is disposed on the opposite side of the rotation transmitting mechanism from a front end region in the longitudinal direction of the spindle 150. A controller 180 controls the rotation speed of the motor 110 based on the detection result of the detecting mechanism 162 and drives the motor 110.

公开(公告)号：US11865924B2

公开(公告)日：2024-01-09

申请号：US17855367

申请日：2022-06-30

Applicant: MAKITA CORPORATION

Inventor： Ryo Umemoto ,  Hirokatsu Yamamoto

IPC: B60L15/20 ,  B62B5/00 ,  H02P3/22 ,  H02P5/74 ,  B60L15/30

CPC classification number: B60L15/2009 ,  B60L15/30 ,  B62B5/0036 ,  B62B5/0069 ,  H02P3/22 ,  H02P5/74 ,  B60L2240/425

Abstract: A cart may include a driving wheel, a motor configured to rotate the driving wheel, a motor drive circuit configured to drive the motor, a motor brake circuit configured to electrically brake the motor, a control device configured to control the motor via the motor drive circuit and the motor brake circuit so that a travelling speed of the cart becomes equal to or lower than an upper limit travelling speed, and a temperature sensor configured to detect a temperature of the motor brake circuit. The control device may be configured to change the upper limit travelling speed to a second upper limit travelling speed lower than the first upper limit travelling speed when the upper limit travelling speed is a first upper limit travelling speed and the temperature detected by the temperature sensor exceeds a first predetermined temperature.

公开(公告)号：US11027867B2

公开(公告)日：2021-06-08

申请号：US16222076

申请日：2018-12-17

Applicant: MAKITA CORPORATION

Inventor： Hirokatsu Yamamoto ,  Kunihisa Shima

IPC: B65B13/22 ,  B65B13/18 ,  B65B13/28

Abstract: A tying machine may include a twisting mechanism configured to twist a tying string. The twisting mechanism may include a twisting motor. The tying machine may be configured to obtain torque acting on the twisting motor as a twisting torque value, and stop the twisting motor when a predetermined tying completion condition is satisfied. The tying completion condition may include that an elapsed time since a rise in the twisting torque value was detected reaches a first predetermined time.

公开(公告)号：US10954947B2

公开(公告)日：2021-03-23

申请号：US15568062

申请日：2016-04-19

Applicant: MAKITA CORPORATION

Inventor： Hirokatsu Yamamoto ,  Yuki Kawai ,  Makoto Takahashi

IPC: H02P6/06 ,  H02P5/46 ,  B08B5/02 ,  H02P5/74 ,  F04D25/08 ,  H02P6/18 ,  F04D25/06 ,  F04D27/00 ,  H02P6/04

Abstract: A backpack-type blower according to one aspect of the present disclosure includes a plurality of fans, a plurality of DC power supplies and a backpack. The plurality of fans and the plurality of DC power supplies are mounted on the backpack. The backpack-type blower is configured to blow winds from the plurality of fans together.

公开(公告)号：US10883660B2

公开(公告)日：2021-01-05

申请号：US15660372

申请日：2017-07-26

Applicant: MAKITA CORPORATION

Inventor： Takeshi Nishimiya ,  Hirokatsu Yamamoto

IPC: F16P3/00 ,  B24B23/02 ,  B25F5/00

Abstract: An electric power tool in one aspect of the present disclosure comprises a main body, a motor, a driver, a detector, and a kickback determiner. The kickback determiner determines that the main body is kicked back from a workpiece when an attitude change amount of the main body detected by the detector exceeds a preset kickback determination threshold during driving of the motor by the driver.

公开(公告)号：US10422146B2

公开(公告)日：2019-09-24

申请号：US15742573

申请日：2016-03-11

Applicant: MAKITA CORPORATION

Inventor： Kunihisa Shima ,  Hirokatsu Yamamoto ,  Ryo Umemoto

IPC: E04G21/12 ,  B21F15/00 ,  B21F15/06 ,  B25B25/00

Abstract: A rebar tying device is configured to tie a plurality of rebars by a wire. The rebar tying device includes a feeder configured to feed the wire wound around a reel by a rotation of a feeding motor; a guide configured to guide the wire fed by the feeder to around the plurality of rebars; a cutter configured to cut the wire fed by the feeder at a predetermined position; a twister configured to twist the wire around the plurality of rebars; a battery configured to supply power to the feeding motor; and a control unit. The control unit configured to control a feeding length of the wire by controlling an energizing time of the feeding motor based on a predetermined feeding length of the wire.

公开(公告)号：US20250076885A1

公开(公告)日：2025-03-06

申请号：US18800597

申请日：2024-08-12

Applicant: MAKITA CORPORATION

Inventor： Tatsuya YOSHIKAWA ,  Hirokatsu Yamamoto ,  Masahiro Kojima ,  Genki Toyoda

IPC: G05D1/244 ,  A01D34/00 ,  B60L53/36 ,  G05D1/661 ,  G05D105/15

Abstract: An autonomous movement system may include: a working robot configured to perform an operation while moving autonomously in a working area; a charging station configured to charge the working robot; a boundary wire defining the working area; and a station wire disposed at the charging station and electrically connected to the boundary wire. The working robot may include: a magnetic detecting unit configured to detect a magnetic field generated by the boundary wire and a magnetic field generated by the station wire; and a control unit configured to detect the station wire based on a detection result by the magnetic detecting unit. The charging station may include: a charging terminal configured to be electrically connected to the working robot; and a signal generator configured to supply an identical electric signal to the boundary wire and the station wire.

公开(公告)号：US11325228B2

公开(公告)日：2022-05-10

申请号：US15948003

申请日：2018-04-09

Applicant: MAKITA CORPORATION

Inventor： Takaaki Osada ,  Hirokatsu Yamamoto ,  Goshi Ishikawa ,  Kunihisa Shima

IPC: B25B21/00 ,  B25F5/00 ,  B25B21/02 ,  B25B23/147

Abstract: A rotary impact tool in one aspect of the present disclosure includes a motor, an impact mechanism, an impact detector, and a controller. The controller executes constant duty ratio control from when the motor is started until an impact is detected by the impact detector. The controller executes constant rotation speed control in response to detection of an impact by the impact detector.