US 12,220,798 B2
Electric power tool and method of controlling the same
Cheng-En Tsai, Taichung (TW); An-Gi Liu, Taichung (TW); Chang-Sheng Lin, Taichung (TW); and Fu-Ying Huang, Taichung (TW)
Assigned to BASSO INDUSTRY CORP., Taichung (TW)
Filed by BASSO INDUSTRY CORP., Taichung (TW)
Filed on Jun. 20, 2023, as Appl. No. 18/337,687.
Claims priority of application No. 111123042 (TW), filed on Jun. 21, 2022.
Prior Publication US 2023/0405782 A1, Dec. 21, 2023
Int. Cl. B25C 1/06 (2006.01); B25C 1/00 (2006.01)
CPC B25C 1/06 (2013.01) 10 Claims
OG exemplary drawing
 
1. An electric power tool comprising:
a motor;
a lifter configured to be driven by said motor;
a firing pin configured to be driven by said lifter to move from a bottom dead center to a standby position where said firing pin is ready to perform a firing action, the bottom dead center being farthest from the standby position in a firing direction from the standby position to the bottom dead center, said firing pin being at the bottom dead center after finishing the firing action;
an electromagnet;
a driving circuit electrically connected to said electromagnet and configured to provide an electric current to excite said electromagnet;
a latch configured to be moved by said electromagnet from a blocking position where said latch blocks the firing pin from moving to the bottom dead center to a non-blocking position where said latch does not block the firing pin from moving to the bottom dead center when said electromagnet is in a fully excited state, and be in the blocking position when said electromagnet is in a non-excited state; and
a controller electrically connected to said driving circuit and configured to, during an excitement period,
control said driving circuit to provide a constant electric current to said electromagnet for a first time period to excite said electromagnet to the fully excited state, and
immediately after the first time period, control said driving circuit to provide a pulsating electric current to said electromagnet for a second time period to keep said electromagnet in the fully excited state.