Arrangement for positioning a pen in a recording device
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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Abstract
The present invention is embodied as an arrangement for positioning a pen in a device that records the time profile of a measurement signal which can be connected to the device. The arrangement provides high mapping accuracy of the measurement signal onto the recording signal at a low cost and with DC isolation between the measurement signal and drive means of the pen. The arrangement uses a control loop that has a pulse width modulator whose output is DC-decoupled to a signal converter that provides the drive signal for the motor that moves the pen.
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Citations
17 Claims
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1. A recording device for recording the time profile of at least one measurement signal, comprising:
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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, and iii) 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, and e) means connected between said pulse-width modulator and said signal converter for DC-decoupling said PWM signal to said signal converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A recording device for recording the time profile of at least one measurement signal, comprising:
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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 pen holding means, 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 signal indicative thereof, iii) a summation device for determining a control error signal as the difference between said measurement signal and said electrical pen position signal, and iii) a pulse-width modulator responsive to said control error signal for generating a PWM signal, and d) a signal converter DC-decoupled to said pulse-width modulator for converting said PWM signal to a signal voltage for driving said drive motor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification