Abstract: A flying spot scanning system is provided which is capable of scanning an unmodulated beam to a reading station for reading a stationary document and a modulated beam to an imaging station for recording an image thereat. The system utilizes optical elements which are common to both the unmodulated beam and the modulated beam to avoid duplication of elements of each beam. The beams strike the same facets of a rotating polygon scanner at the same location so that precise alignment of the facets will not be required. Relatively movable mirrors are moved across a stationary document at the reading station to provide a scan in such a manner to maintain optical conjugates constant.

Abstract: A duplex copying machine is provided wherein an original document, having images on both sides, is located between a transparent rotatable drum and conveyor belts and is automatically transported thereby to a first image station to expose to a photoconductor, by lamps external to the drum, the side of the document engaged by the conveyor belts. Thereafter, the document is automatically transported to a second image station to expose to the photoconductor, by lamps surrounded by the drum, the side of the document engaged by the drum.

Abstract: A chain tensioning device is provided wherein a spring biased sprocket engages a chain to exert tension thereon. The device includes a mechanism to allow a service person to relieve the tension exerted on the chain by the tensioning device and to inactivate the spring biasing force while leaving both hands free to repair or replace the chain. The construction of the mechanism allows a simple manipulation to activate the spring biasing force to exert tension on the chain after the chain has been repaired or replaced.

Abstract: A flat field scanning system is disclosed which has the following characteristics: (a) a stationary lens is located between a scanning mirror and a medium; (b) the mirror is moved linearly for scanning; (c) at the start of scan, a beam is directed from or received by the mirror substantially on axis of the lens; (d) the beam distance from the object plane of the lens to the lens and from the lens to the image plane of the lens always increases from the start of scan to the end of scan; and (e) during movement of the mirror, the mirror is pivoted to continue to reflect the beam through or receive the beam from the center of the lens. Linear movements are utilized in the scanning system eliminating the use of intricate cam surfaces.In one embodiment, the medium is either a recording medium or a document to be read by scanning and is located at the image plane of the lens. The scanning mirror is located between the object plane of the lens and the lens and scans the beam to the medium.

Abstract: A flying spot scanning system is provided which has a separate scanning system for imaging characters onto a recording medium and has a separate x- y galvanometer operated mirror scanning system for imaging a graphic curve onto the recording medium.

Abstract: A height sensing device is provided which comprises a beam interrupter which swings into and out of the path of a beam passing from a light source to a photodiode. The beam interrupter is a disc rotatably mounted on a swinging sensor. The disc has a slot eccentrically located about the rotational axis of the disc. For adjustment, the disc may be rotated relative to the sensor to bring a portion of the slot into the beam path and then locked in such a position onto the sensor.

Abstract: A rotatable "Y" scan mirror for a flat field scanning system is provided whereby the mirror is shifted in opposite directions transverse to its pivotable axis and is simultaneously rotated in one direction during a scanning cycle. A pair of cams is mounted on a common rotatable shaft for rotation therewith. One of the cams actuates a link connected to a pivot pin on which the mirror rotates. The other cam actuates an arm which is connected to the mirror to rotate the same. The cams are so designed to cause shifting of the mirror to maintain a constant length optical path to the medium being scanned and to cause rotation of the mirror in such a manner that the rate of scanning across the medium will be constant.

Abstract: A magnetic card transport system for an electronic typewriter comprises a reversible drive roller and a coacting pinch roller which form a nip through which a magnetic card is passed. The drive roll and pinch coact to move the card in opposite directions. A guide surface is provided which is engaged by one longitudinal edge of the card, and guide springs are provided which engage the other longitudinal edge of the card to urge the card into engagement with the guide surface for registration purposes. The pinch roll is mounted in such a manner that it may freely oscillate. The oscillation is such that the pinch roll axis pivots in each direction from a line substantially perpendicular to the guide surface between 1/2.degree. and 3.degree. about a vertical axis normal to its axis of rotation to allow for self-alignment to maintain the card in alignment with the guide surface.

Abstract: An apparatus is provided which limits the amount of developer that is presented to an electrostatic latent image to a width corresponding to the length of copy paper used. This particular apparatus and method apply to a development system which has a developer sump communicated to a magnetic transport means through a developer outlet at the lower end of the sump. During development functions, magnetic developer flows from the sump through the outlet to the magnetic transport means to be presented to the latent image. A plurality of magnetic gates are provided, each of which; may be swung into closed position adjacent the outlet to magnetically block flow of developer through that portion of the outlet corresponding to the length of the magnetic gate adjacent thereto. Each magnetic gate may also be swung into an open position which allows developer to flow through the outlet corresponding to the length of the magnetic gate adjacent thereto.