Abstract: A novel and improved form of displacement mechanism has been devised for an infant bouncer seat of the type having a resilient frame with a base support located directly beneath the seat proper, the displacement mechanism mounted on the base portion and including a variable speed motor drive which operates through a speed reduction mechanism into a crank arm at one end of a lift arm which is pivotal in response to activation of the motor drive to impart vertical reciprocal motion to the base. The motor speed is adjusted to tune the frequency of reciprocal motion of the base to the natural frequency of the seat for a particular weight baby, and the connection of the lift arm to the base can be adjusted to vary the amplitude of reciprocal motion of the lift arm and the base.

Abstract: A method and apparatus for centerless grinding of one or more tapered sections in a length of wire in which the wire is advanced through a gap formed between a rotating work wheel and regulating wheel, and the gap is adjusted in forming the tapered section by an image detection module upstream of the wheels made up of a linear array of closely spaced pixels beneath a guide slot through which the wire is advanced to sense the position of the wire at close increments and incrementally adjust the gap in strict accordance with the position actually sensed.