公开(公告)号：US11478842B1

公开(公告)日：2022-10-25

申请号：US17719481

申请日：2022-04-13

申请人： MAKITA CORPORATION

发明人： Yuta Izutsu ,  Kisho Sekido

IPC分类号： B21J15/26 ,  B21J15/04 ,  B21J15/28 ,  B21J15/34 ,  B21J15/10

摘要： A fastening tool includes a motor, an anvil, a pin-gripping part, a magnet having the north pole and the south pole aligned in a front-rear direction and configured to move integrally with the pin-gripping part in the front-rear direction, a first magnetic sensor having a first sensing surface, a second magnetic sensor having a second sensing surface and disposed rearward of the first magnetic sensor, and a control device configured to move the pin-gripping part rearward based on a detection result of the second magnetic sensor and to move the pin-gripping part forward based on a detection result of the first magnetic sensor. The first and second magnetic sensors are unipolar detection type sensors configured to detect a same specified pole of the magnet. Orientations of the first sensing surface and the second sensing surface relative to a movement axis of the magnet are opposite to each other.

公开(公告)号：US11031770B2

公开(公告)日：2021-06-08

申请号：US16099219

申请日：2017-04-26

申请人： MAKITA CORPORATION

发明人： Yuta Izutsu ,  Katsuhito Fujinami ,  Akira Ito

IPC分类号： H02H3/20 ,  B25F5/00 ,  H02P27/06 ,  H02H7/122 ,  B23B45/02 ,  H02P29/024

摘要： An electric working machine in one aspect of the present disclosure includes a main current-path, a driving unit including a motor and at least one first semiconductor-switching-element, a controller, a bypass current-path, a second semiconductor-switching-element, and a switch driver. The main current-path is arranged between a positive electrode and a negative electrode of a battery. The driving unit is situated in the main current path. The bypass current-path is arranged in parallel with the driving unit. The second semiconductor-switching-element is situated in the bypass current-path. The switch driver causes the second semiconductor-switching-element to interrupt the bypass current-path in an event that a voltage value of a drive voltage applied to the driving unit is less than a threshold value, and causes the second semiconductor-switching-element to complete the bypass current-path in an event that the voltage value is equal to or greater than the threshold value.