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公开(公告)号：US11770079B2
公开(公告)日：2023-09-26
申请号：US17889109
申请日：2022-08-16
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa
CPC classification number: H02P1/12 , H01M10/48 , H02J7/0063 , H02J7/00712 , H02P29/0016 , H02P2209/09
Abstract: An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.
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公开(公告)号：US11146087B2
公开(公告)日：2021-10-12
申请号：US16884788
申请日：2020-05-27
Applicant: MAKITA CORPORATION
Inventor： Motohiro Omura , Junya Matsushita , Yoshitaka Ichikawa
Abstract: An electric working machine of one aspect of the present disclosure includes a connection port, a control circuit, and/or a power supply switch. The power supply switch is provided on a power supply path extending from a battery pack connected to the connection port to the control circuit. The power supply switch maintains an ON state while a power supply permission signal is output from the battery pack to the electric working machine. The control circuit outputs an ON-command signal to the power supply switch for a specified period of time in response to loss of the power supply permission signal from the battery pack.
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13.发明授权公开(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
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.
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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.
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公开(公告)号：US10322498B2
公开(公告)日：2019-06-18
申请号：US14885448
申请日：2015-10-16
Applicant: MAKITA CORPORATION
Inventor： Goshi Ishikawa , Ryunosuke Kumagai , Takuya Kusakawa , Yoshitaka Ichikawa , Tokuo Hirabayashi
Abstract: An electric power tool in one aspect of the present disclosure comprises a motor, a hitting mechanism, a hitting detector, and a control unit. The control unit is configured to set a control amount of the motor so that the motor rotates at a lower speed than a speed in the target rotation state during an initial driving period, and switch the control amount to a final control amount corresponding to the target rotation state when the initial driving period elapses. The initial driving period is a period from when generation of a hitting force is detected by the hitting detector until a predetermined first time period elapses, after the motor is started driven.
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Patent Agency Ranking
公开(公告)号：US20150217436A1
公开(公告)日：2015-08-06
申请号：US14399647
申请日：2013-05-07
Applicant: MAKITA CORPORATION
Inventor： Kenya Yanagihara , Ying Yang , Yoshitaka Ichikawa , Yuki Kawai
CPC classification number: B25C1/041 , B25C1/04 , B25C1/06 , Y10T29/49833
Abstract: A driving tool, such as a nailer, includes a compression piston slidably disposed within a compression cylinder. An electric motor and a crank mechanism reciprocally drive the compression piston within the compression cylinder, and a sensor directly or indirectly detects the position of the compression piston. Prior to the start of a driving operation, a return operation is performed to move the compression piston to its bottom dead center when the sensor detects that the compression piston is located at a position other its bottom dead center.
Abstract translation: 诸如钉枪的打入工具包括可滑动地设置在压缩缸内的压缩活塞。 电动机和曲柄机构在压缩气缸内往复驱动压缩活塞，传感器直接或间接地检测压缩活塞的位置。 在开始驾驶操作之前，当传感器检测到压缩活塞位于其下死点以外的位置时，执行返回操作以将压缩活塞移动到其下止点。
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公开(公告)号：US12023787B2
公开(公告)日：2024-07-02
申请号：US17145965
申请日：2021-01-11
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa , Takuya Kusakawa
IPC: B25B23/147 , B25B21/02 , B25F5/00 , H02P29/024
CPC classification number: B25B23/1475 , B25B21/02 , B25F5/00 , H02P29/024
Abstract: An electric powered work machine in one aspect of the present disclosure includes a motor, a tool driver, a command receiver, a diagnosis circuit, and a result transmitter. The diagnosis circuit executes a failure diagnosis of the electric powered work machine in response to the command receiver receiving a diagnosis command signal from a diagnosis device. The result transmitter transmits a diagnosis result signal to the diagnosis device. The diagnosis result signal indicates a result of the failure diagnosis that is executed by the diagnosis circuit.
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公开(公告)号：US11463027B2
公开(公告)日：2022-10-04
申请号：US17015158
申请日：2020-09-09
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa
Abstract: An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.
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19.发明授权公开(公告)号：US10326385B2
公开(公告)日：2019-06-18
申请号：US15992530
申请日：2018-05-30
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa
Abstract: In one aspect of the present disclosure, an electric working machine includes a three-phase brushless motor, a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, a sixth switching element, a rotation detector, a brake controller. The brake controller executes a two-phase short-circuit brake. The two-phase short-circuit brake is executed so as to switch any of the fourth switching element, the fifth switching element, and the sixth switching element to a corresponding ON-state or an OFF-state in response a detection signal from the rotation detector that occurs prior to a switching time.
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公开(公告)号：US09553542B2
公开(公告)日：2017-01-24
申请号：US14744721
申请日：2015-06-19
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Machida , Yoshitaka Ichikawa
CPC classification number: H02P29/20 , B23D51/16 , B23D59/001 , B25D11/00 , B25D16/00 , B25D16/006 , B25D2250/201 , B25D2250/221 , H02P7/18
Abstract: A hammer drill (100) comprises an electric motor (110), a piston (127) as a driving member and a controller (199) which controls and drives the electric motor (110). The piston (127) is reciprocated by rotation of the electric motor (110) and thereby a hammer bit (119) is driven in its longitudinal direction. The hammer bit (119) is moved forward in response to a forward movement stroke of the piston (127) and thereby a hammering operation is performed by the hammer bit (119). The controller (199) sets a duty ratio of a driving pulse signal which drives the electric motor (110) in the forward movement stroke of the piston (127) to be larger in order to prevent a reduction of a rotation speed of the electric motor (110) due to a load applied on the electric motor (110) during the forward movement stroke of the piston (127).
Abstract translation: 锤钻（100）包括电动机（110），作为驱动构件的活塞（127）和控制和驱动电动机（110）的控制器（199）。 活塞（127）通过电动机（110）的旋转而往复运动，从而使锤头（119）在其长度方向上被驱动。 响应于活塞（127）的向前移动行程，锤钻头（119）向前移动，从而通过锤钻头（119）执行锤击操作。 控制器（199）将活塞（127）的前进行程中驱动电动机（110）的驱动脉冲信号的占空比设定得较大，以防止电动机的转速降低 （110）在活塞（127）的向前移动行程期间由于施加在电动机（110）上的负载而产生。
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