Abstract: A double blade rotary paper cutter is disclosed which may be used as an auxiliary unit with a controlled printer unit. The paper cutter features a series of cutting blades which effect the removal of fanfold or perforated portions and carrier strips from fanfold paper and a positional control mechanism to sequentially and precisely position individual strips of fanfold paper within the cutting area of blades of the rotary paper cutter.

Abstract: This invention discloses a swinging paper feed path platform pivotally mounted on a main frame of an electrographic printer apparatus for swinging movement between an operative position and an inoperative position about a pivot axis established by a driving shaft of a bidirectional tractor drive which is continuously engaged with the paper being fed through the apparatus regardless of the positioning of the swinging platform.

Abstract: In electrographic printing apparatus, a charge transfer endless-loop dielectric belt including a conductive member to effect a ground plant is supported to tension with an unsupported portion thereof disposed opposite the electrodes of the print head. The unsupported portion results from belt engagement with the printhead in regions adjacent to the electrodes to provide the desired electrode/dielectric belt spacing.

Abstract: A controlling electrode is positioned in physical proximity to one or more electrodes in an electron beam tube so that the controlling and controlled electrodes are subject to common electron bombardment. A control voltage of preselected magnitude and polarity is applied to the controlling electrode. During the common electron bombardment, primary and secondary electrons are present in the region of the electrodes, an exchange of electrons occurs between the electrodes, and the voltage on the controlled electrodes switches to a value at or near the voltage applied to the controlling electrode. The electron beam tube can be a cathode ray pin tube used in electrostatic printing in which case a single controlling electrode is positioned in proximity to the array of conductive pins in the tube face plate.