Bounce control system for moving coil printing element
AssigneeGeneral Electric Company
InventorsAndrew B. Carson, Jr., William A. Hanger
Life of this patent
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Abstract
In a drive circuit for an electromagnetic printing element of an impact printer, a drive pulse drives the printing element from a backstop toward a record medium to print indicia. A voltage comparator senses the change in the induced voltage in the printing element when it impacts on the backstop for triggering a single shot circuit to apply to the printing element a damping pulse of a polarity such as to oppose its rebound from the backstop. A latch circuit is responsive to the damping pulse to disable the single shot circuit until the end of the next drive pulse. The drive and damping pulses are applied to the printing element through a bidirectional current source.
Claims14
In an impact printer which develops a force whose direction is a function of the direction of the driving current, said printer comprising a movable electromagnetic printing element located adjacent a backstop and a source of drive pulses for moving the printing element from the backstop toward a record medium to print indicia, damping means coupled to the printing element and responsive to impact of the printing element on the backstop for applying to said printing element a damping pulse after impact theref on the backstop to oppose the rebound of the printing element from the backstop.
In an impact printer having a movable ellectromagnetic printing element biased toward a backstop and a source of drive pulses for moving the printing element from the backstop toward a record medium to print indicia;
- the improvement comprising a source of damping pulses coupled to the printing element for applying thereto a damping pulse after impact thereof on the backstop to oppose the rebound of the printing element from the backstop, and control means coupled to the source of drive pulses and to said source of damping pulses and responsive to the application of a damping pulse to the printing element for preventing application of another damping pulse to the printing element until after the next drive pulse.
In an impact printer which develops a force whose direction is a function of the direction of the driving current, said printer comprising a movable electromagnetic printing element located adjacent a backstop and a source of drive pulses for moving the printing element from the backstop toward a record medium to print indicia, damping means coupled to the printing element for applying thereto a damping pulse only after impact thereof on the backstop to oppose the rebound of the printing element from the backstop.
Dependencies are inferred from the claim text.