Abstract: An articulated robot including a vertical rod secured with lockbolts at the end of its arm which is fixed to a screw fastening unit by means of an upper bracket and a lower bracket. The robot further includes a studbolt parallel to the vertical rod at the lower end of the arm. Two nuts are mated with the studbolt to compress the lower bracket. Releasing the lockbolt and rotating the nuts clock-wise or counter-clockwise causes the vertical rod to easily slide to adjust the height of a screw fastening unit from workpieces of different types without having the operator hold the screwing unit by hand.

Abstract: A fastener feeding apparatus includes a hopper for the bulk storage of fasteners, an oscillating scoop plate body for scooping up the fasteners from the hopper and letting them slide down onto a vibrating chute rail and a spring biased exclusion plate which moves back and forth above the chute rail to return any improperly oriented fasteners back into the hopper.

Abstract: A power operated screwdriver having a head at an end thereof. The head includes a body having a bit passageway and a screw passageway. The bit and screw passageways intersect in an inclined manner. A pair of screw holding jaws are pivotally mounted in a detachable manner on the head. A spring is provided for each of the screw holding jaws for biasing the screw holding jaws towards one another for holding screws in a driving position after the screws exit from the screw passageway. Stop jaw mounting openings are provided at an end of each of the holding jaws and pass completely through the holding jaws. A pair of stop jaws are pivotally mounted in a detachable manner within each of the mounting openings. A spring is provided for each of the stop jaws for biasing the stop jaws towards one another. Both the holding jaws and the stop jaws pivotally swing in the same plane.