NZ603469A - Feeder mechanism retention device for fastener driving tool - Google Patents

Abstract

603469 A fastener driving tool employing magazines feeding fasteners to a nosepiece for receiving a driving force. The tool has a power source including a reciprocating drive piston and associated driver blade disposed within a cylinder (20). A tool nose is associated with the power source for receiving the driver blade for driving fasteners (26) fed into the nose. The tool includes a magazine constructed and arranged to house a supply of the fasteners (26). A magazine feeder mechanism (50) is associated with the magazine for sequentially feeding fasteners (26) into the nose, the feeder mechanism (50) including a feed piston (58) reciprocating between an advanced position and a retracted position relative to the tool nose. A gas conduit (44) is in fluid communication with power source gases and a feed cylinder (56) housing the feed piston (58). An electromechanical retention device (110) retains the feed piston (58) in the retracted position until the driver blade reaches a pre-firing position, the electromechanical retention device (110) being an electromagnet (112) disposed to operationally engage the feed piston (58). A control module in the tool controls the electromagnet (112) for determining an energisation cycle of the electromagnet (112) for retaining the feed piston (58) in the retracted position until the driver blade reaches the pre-firing position for preventing side loading against the driver blade by a next fastener (26) to be driven.