| CPC B21J 15/26 (2013.01) [B21J 15/105 (2013.01); B21J 15/022 (2013.01)] | 11 Claims |
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1. A fastening tool which fastens a work piece by utilizing a fastener that includes a pin including a shaft portion and a head portion that are integrally formed, and a hollow shaped collar which is engageable to the pin, the work piece being disposed between the head portion and the collar, the fastening tool comprising:
a pin holding portion which can hold an end part region of the shaft portion,
an anvil,
a motor that is configured to drive the pin holding portion to move the pin holding portion relatively to the anvil in a predetermined longitudinal direction, and
a controller that is configured to conduct drive control of the motor,
wherein in a state in which the pin holding portion holds the end part region of the shaft portion, the pin holding portion is configured to relatively move to the anvil in a predetermined first direction of the longitudinal direction and the anvil is configured to push the collar engaged with the shaft portion to fasten the fastener,
wherein the fastener is configured to be fastened in a state that the collar and the head portion clamp the work piece and the end part region is integral with the shaft portion,
wherein the controller is configured to drive the pin holding portion to move in the first direction to conduct the fastening of the fastener by a motor drive control mode defined as a drive control of the motor based on motor drive current and motor drive electric power such that (i) a first reference value regarding the motor drive current is equal to or less than a predetermined first upper limit value, and (ii) a second reference value regarding the motor drive electric power is equal to or less than a predetermined second upper limit value, and
wherein the second upper limit value is set to correspond to an inertia force of the motor in the fastening operation.
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