High speed printer
AssigneeExtel Corporation
InventorsRaymond E. Kranz, Benjamin M. Starr
Life of this patent
Estimating the term…
Abstract
Ribbon reversing mechanism in a high speed printer (telecircuitry) including a ribbon driving stepping motor and a print head drive motor both incrementally driven by pulses from the telegraph circuit. The gear ratios in the ribbon drive train are chosen to ensure that the ribbon is advanced in increments different than the increments of print head movement. The ends of the ribbon are provided with eyelets which are sensed by a mechanism which operates to reverse the ribbon driving motor.
Claims8
In combination with a high speed teleprinter apparatus wherein characters are printed by a high speed printing head advancing in short high frequency increments in response to a telegraph circuit, a ribbon reversing mechanism comprising:
- a pair of spools for supporting the ribbon, each spool having a driven gear;
- a gear train including a pinion gear selectively engageable with each of the driven gears to feed the ribbon in one direction or the other;
- a reversing stepping motor energized by the telegraph circuit for incrementally rotating the pinion gear;
- means to establish an increment of movement of the ribbon different in dimension compared to the increment of movement of the printing head;
- and
- means for reversing the stepping motor after a predetermined length of ribbon has been extended.
Dependencies are inferred from the claim text.