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Arrangement for positioning a pen in a recording device

  • US 5,764,244 A
  • Filed: 10/24/1996
  • Issued: 06/09/1998
  • Est. Priority Date: 10/27/1995
  • Status: Expired due to Fees
First Claim
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1. A recording device for recording the time profile of at least one measurement signal, comprising:

  • a) means for transport of a medium to record said at least one measurement signal time profile;

    b) a printing system comprising;

    i) an electric drive motor;

    ii) a transmission apparatus for conversion of the rotational drive movement of said drive motor into a translational movement transversely with respect to the transport direction of said recording medium; and

    iii) means for holding a pen, said pen holding means arranged such that said pen holding means follows the translational movement of said transmission apparatus,said drive motor mechanically coupled through said transmission apparatus, such that said drive motor is electrically isolated, to said means for holding the pen,c) means for controlling said drive motor having a control loop comprising;

    i) means for determining the current position of said pen and providing an electrical pin position signal indicative thereof,ii) a summation device for determining a control error signal as the difference between said measurement signal and said electrical pen position signal, andiii) a pulse-width modulator responsive to said control error signal for generating a PWM signal,d) a signal converter for converting said PWM signal to a signal voltage for driving said drive motor, ande) means connected between said pulse-width modulator and said signal converter for DC-decoupling said PWM signal to said signal converter.

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