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：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.

公开(公告)号：US10953524B2

公开(公告)日：2021-03-23

申请号：US15928788

申请日：2018-03-22

Applicant: MAKITA CORPORATION

Inventor： Masahiko Sako ,  Takaaki Osada ,  Hirokatsu Yamamoto

IPC: B25B21/02 ,  B25B23/147 ,  B25B23/14

Abstract: An impact fastening tool may include a motor; a hammer configured to be rotationally driven by the motor; an anvil configured to be hit in a rotational direction by the hammer; a signal obtainer configured to obtain a variable signal which varies in accordance with a hit to the anvil by the hammer; and a seating determiner configured to determine whether or not a fastener has been seated based on the variable signal obtained by the signal obtainer, wherein the seating determiner is configured to determine whether or not the fastener has been seated based on a signal component of the variable signal obtained by the signal obtainer, the signal component corresponding to a predetermined reference frequency.

公开(公告)号：US11607789B2

公开(公告)日：2023-03-21

申请号：US17018079

申请日：2020-09-11

Applicant: MAKITA CORPORATION

Inventor： Hikaru Sunabe ,  Hirokatsu Yamamoto ,  Takaaki Osada

IPC: B25F5/00 ,  B25F5/02 ,  H02P29/00 ,  B25B21/00 ,  B25D16/00

Abstract: An electric working machine in one aspect of the present disclosure includes an output shaft, a motor, a housing, an acceleration detector, a twisted motion detector, a reference level changer, and a motor controller. The acceleration detector detects an acceleration of the housing in a circumferential direction of the output shaft. The twisted motion detector detects a twisted motion of the housing based on a reference level and the acceleration detected. The reference level determines that the housing is twisted. The reference level changer changes the reference level based on a rotating motion of the output shaft.

公开(公告)号：US10953532B2

公开(公告)日：2021-03-23

申请号：US15723757

申请日：2017-10-03

Applicant: MAKITA CORPORATION

Inventor： Hikaru Sunabe ,  Hirokatsu Yamamoto ,  Takaaki Osada

IPC: B25D16/00 ,  B25D17/20 ,  B25D17/24 ,  F21V33/00 ,  B25D11/00 ,  B25D17/04

Abstract: An electric power tool is configured to rotate an attachment about a Z-axis. The electric power tool includes a three-axes acceleration sensor and an acceleration detection circuit. The acceleration detection circuit calculates an angular acceleration about the Z-axis based on an input signal from the three-axes acceleration sensor. The acceleration detection circuit calculates a change in an angular velocity based on integrating the angular acceleration for a most recent period. The acceleration detection circuit determines a Z-axis angular velocity about the Z-axis, without adding a previous change in the angular velocity from before the most recent period, as equal to the change in angular velocity. The acceleration detection circuit detects a twisted-motion of the electric power tool based on the Z-axis angular velocity.