US 12,109,672 B2
Working tool
Sotaro Aizawa, Ibaraki (JP); and Toshinori Yasutomi, Ibaraki (JP)
Assigned to Koki Holdings Co., Ltd., Tokyo (JP)
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
Filed on Oct. 28, 2022, as Appl. No. 18/050,644.
Claims priority of application No. 2021-177856 (JP), filed on Oct. 29, 2021.
Prior Publication US 2023/0137720 A1, May 4, 2023
Int. Cl. B25C 1/06 (2006.01); B25C 1/00 (2006.01)
CPC B25C 1/06 (2013.01) [B25C 1/001 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A working tool comprising:
a magazine unit accommodating collated fasteners, wherein the collated fasteners are fasteners connected together and arranged in a coil;
an ejection unit to which the fasteners are fed one by one;
a striking unit operable to move in a first direction to strike one of the fasteners fed to the ejection unit;
a biasing unit configured to bias the striking unit to move in the first direction;
a lifting unit configured to be engaged with the striking unit and operable to be rotated to lift the striking unit in a second direction opposite the first direction;
a first drive unit configured to rotate the lifting unit;
a feeder unit operable to move in a third direction crossing the first and second directions and feed the fasteners stored in the magazine unit to the ejection unit one by one;
a second drive unit configured to drive the feeder unit;
an operation unit adapted to be operated by a worker to switch a driving state of the first drive unit; and
a control unit configured to control the first drive unit and the second drive unit,
wherein, when the operation unit is operated in a state where the striking unit is positioned at a standby position, the striking unit moves in the second direction to a top dead center, engagement of the striking unit with the lifting unit is released, the striking unit moves in the first direction to a bottom dead center by a biasing force of the biasing unit, the striking unit is engaged with the lifting unit again, and then the striking unit moves in the second direction to the standby position, and
wherein the control unit includes a detection unit configured to detect a position of the striking unit, and is further configured to activate the second drive unit to drive the feeder unit in response to meeting both a first condition and a second condition,
wherein the first condition is met when a load current of the first drive unit becomes below a current threshold, and
wherein the second condition is met when the detection unit determines that the striking unit is positioned at a predetermined position.