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OSCILLATING MECHANISM

  • US 3,671,766 A
  • Filed: 06/29/1970
  • Issued: 06/20/1972
  • Est. Priority Date: 06/29/1970
  • Status: Expired due to Term
First Claim
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1. In a scanning device operable to move a scanning element in oscillating mode through a determined arc of travel, the combination of pivot means to accommodate said oscillating movement, combination means to initiate said oscillating movement at device start up and to maintain said oscillating movement during device operation, said combination means comprising a rotor carried by the oscillating element adjacent one end thereof, a magnetic core in a housing adjacent the rotor, coil means surrounding the magnetic core and internally of the housing, said housing being connected to said magnetic core and having a peripheral flange telescopically receiving said rotor, bosses on the peripheral flange operative to emanate magnetic flux when said coil is electrically energized, other bosses on the rotor of magnetically attractive material alignable with the bosses on the peripheral flange when the scanning element is at midpoint in its cycle of oscillation, spring means having first and second cantilever arm portions carried by the scanning element, said first and second cantilever arm portions being respectively alternately abuttable with first and second fixed electrical contacts at the terminal points of the arc of motion of said element, the engagement between a contact on said spring means and one of said fixed contacts being operable to close an electric circuit through said coil and thereby induce the creation of a magnetic field, the physical engagement between said first and second cantilever arm portions and the respective first and second fixed contacts being operable to alternately flex said spring means and store therein most of the kinetic energy of motion of said oscillating scanning element, said stored energy being releasable by said spring means upon termination of movement of said scanning element in either direction to thereby provide a mechanical biasing force to induce reverse motion of said scanning element, the magnetic field created by the engagement between the contact on said spring means and one of said fixed contacts being operable to create a magnetic biasing force to induce reverse motion of said scanning element, and means to bias said scanning element to a terminal point in its arc of movement upon device shutdown.

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