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Device for detecting the time of termination of opening operation of shutter blades of an electromagnetic programming shutter

  • US 4,527,877 A
  • Filed: 10/25/1982
  • Issued: 07/09/1985
  • Est. Priority Date: 10/27/1981
  • Status: Expired due to Fees
First Claim
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1. Device for detecting the termination of the opening operation of shutter blades of an electromagnetic programming shutter in which at least one of the opening operation and the closing operation of said shutter blades is electromagnetically controlled, comprising:

  • a rotatable sector ring connected to said shutter blades,an induction coil secured to said rotatable sector ring,a permanent magnet secured to a base plate in facing relationship to said induction coil, anda detecting circuit for detecting the vanishing of the electric current induced in said induction coil resulting from the termination of the relative movement between said induction coil and said permanent magnet at the time of termination of the opening operation of said shutter blades after said shutter blades have initiated the opening operation from the closed positions for causing the relative movement between said induction coil and said permanent magnet so as to generate the induced electric current in said induction coil, thereby permitting the time of termination of the opening operation of said shutter blades to be detected by said detecting circuit.

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