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The stepper motor axle is coupled to a coding disk with marks for deriving the motor advance (MA) pulses. Between these MA marks there are fine marks for deriving the print pulses.
English (United States)
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Stepper-Motor-Controlled Printer Carriage For Maintaining Nominal Speed
The stepper motor axle is coupled to a coding disk with marks for deriving
the motor advance (MA) pulses. Between these MA marks there are fine marks
for deriving the print pulses.
For a nominal speed change, the motor advance pulses are
generated by a circuit at a time deviating from the time of
occurrence of the MA marks on the coding disk. (This deviation
corresponds to the pitch of the fine marks.) In this manner, the
carriage is accelerated or decelerated to maintain the nominal speed.
The deviation in speed is determined by a clock-controlled time
measurement between the fine marks on the coding disk.
The figure shows a circuit for generating the MA pulses in accordance with
the nominal speed in the deceleration phase. After having been amplified by
amplifier 1, the print pulses are fed to circuit 2, where their presence is measured
by clock-controlled measuring means. In a compare circuit 3, the time values are
compared with a nominal value, thus obtaining a quantized result of their
deviation from the nominal value. This result is fed to an adder circuit 4, where it
is combined with values predetermined by an algorithm. These values serve to
shift the pulses derived from the MA marks in order to ensure an almost optimum
In the case of a deviation from the nominal value prior to the deceleration
phase, these shifts are influenced by the deviation values in such a m...