Paper feed control system in a printer

Claim 1

In a paper feed control system control system employing a prepunched format tape containing perforations arranged thereon in a direction of tape advancement for controlling paper feed, perforation sensing means for detecting perforations in said tape as said tape advances and for providing perforation signals, driving pulse generating means for generating driving pulses, a pulse motor steppingly rotatable in response to said driving pulses applied thereto to proportionately advance a printing paper whereat a line pulse is produced every one line advancement of said printing paper, means reponsive to advancement of said printing paper to proportionately advance said tape, and a control station responsive to external feed command signals and to said perforation signals to provide said driving pulses and said line pulses, the improvement comprising: means for counting said driving pulses and for producing said line pulse upon counting a first predetermined number of driving pulses, driving pulse gating means for preventing said driving pulses from being applied to said pulse motor when said line pulse and one of said perforation signals are coincidentally provided and for permitting said driving pulses to be applied thereto in response to said external feed command signals, and means responsive to actuation of said control station and the receipt of said perforation signal to preload said counting means with a second predetermined number of driving pulses less than said first predetermined number of driving pulses, whereby each of said line pulses is generated in the approximate midpoint of each of said perforation signals.