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Arrangement for synchronizing an information reading device with the speed of an information medium

  • US 4,127,770 A
  • Filed: 09/23/1976
  • Issued: 11/28/1978
  • Est. Priority Date: 10/02/1975
  • Status: Expired due to Term
First Claim
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1. An arrangement for synchronizing an information reading device with the relative speed of the movement between the reading device and an information medium, the information of which is formed by single characters of a character set having a fixed number of single characters in fixed spatial relationship characterized in that signal generating means are provided for producing an input signal with a time duration which is proportional to the passing time of the first character of the character set through the information device, and analogue timing means are provided and operatively connected to said signal generating means whereby from said input signal for synchronizing the reading device the anglogue timing means produces an output signal the time duration of which is a predetermined multiple of the time duration of said input signal, said timing means comprising a capacitor arranged to have base potential and to be charged from said base potential in a predetermined manner during said speed determining passage time, and then to be discharged in a predetermined manner to said base potential so that completion of the predetermined discharge to said base potential indicates passage of said second end of said set of characters past said information reading device, and wherein said capacitor is provided with:

  • a first current source for supplying a capacitor charging current;

    a second current source for supplying a first capacitor discharging current, which first capacitor discharging current is of equal strength with said capacitor charging current;

    a third current source for supplying a second capacitor discharging current;

    amplifier means arranged to switch off said second current source when a very small voltage change occurs at the capacitor; and

    switch means arranged to switch on and switch off said third current source at the beginning and end, respectively, of said speed determining passage time.

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