US 2023/0405782 A1Published application

Electric power tool and method of controlling the same

AssigneeBasso Industry Corp.

InventorsCheng-En TSAI, An-Gi LIU, Chang-Sheng LIN, Fu-Ying HUANG

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Abstract

An electric power tool includes a motor, a lifter, a firing pin, an electromagnet, a driving circuit, a latch, and a controller. The lifter is driven by the motor to drive the firing pin to perform a firing action. The driving circuit provides electric current to excite the electromagnet. The latch is moved by the electromagnet from a blocking position where the latch blocks the firing pin to move in a firing direction to a non-blocking position where the latch does not block the firing pin when the electromagnet is in an excited state. The controller, during an excitement period, controls the driving circuit to provide constant current for a first time period to excite the electromagnet to the excited state, and provide pulsating current for a second time period to keep the electromagnet in the excited state.

Claims10

Dependent claims

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.

7 more elements

A method of controlling an electric power tool, the electric power tool including a motor, a lifter configured to be driven by the motor, a firing pin configured to be driven by the lifter to move from a bottom dead center to a standby position where the firing pin is ready to perform a firing action, an electromagnet, a driving circuit electrically connected to the electromagnet and configured to provide an electric current to excite the electromagnet, a latch configured to be moved by the electromagnet, and a controller electrically connected to the driving circuit, the bottom dead center being farthest from the standby position in a firing direction from the standby position to the bottom dead center, the method comprising steps of:

during an excitement period, the controller controlling the driving circuit to provide a constant electric current to the electromagnet for a first time period to excite the electromagnet to a fully excited state, such that the latch is moved by the electromagnet from a blocking position where the latch blocks the firing pin from moving to the bottom dead center to a non-blocking position where the latch does not block the firing pin from moving to the bottom dead center when the electromagnet is in the fully excited state, wherein the latch is in the blocking position when the electromagnet is in a non-excited state;
and
immediately after the first time period, the controller controlling the driving circuit to provide a pulsating electric current to the electromagnet for a second time period to keep the electromagnet in the fully excited state.

Dependencies are inferred from the claim text.