Abstract: An automatic sheet feeder is provided with a controller and the controller is provided with a scanning input and user-controlled inputs. Sheets provided at the feeder are scanned to determine image status with regard to face up/face down orientation and simplex/duplex image presentation. The scanned input compared with pre-established and user-provided data.

Abstract: A vertical displacement limit stop or a crash stop is provided in a disk drive for preventing contact of the work function members such as air vanes or the arms of an armstack, or the flexure members, when the actuator is in locked position, with adjacent track surfaces of the disks, in the presence of shock forces. Vertical displacement stops on the work function members each have an impact face which confronts an adjacent surface of a disk. These impact faces each project above any other part of the associated work function member in a position overlapping and confronting the surface of a disk at its outer peripheral edge, outside of tracks recorded on the disk, to prevent other parts of the work function member from contacting the surface of a disk in an area in which tracks are recorded.

Abstract: A disk drive is provided in which the arm/head structures of the armstack are mounted in circumferentially spaced pairs, on individual projections of a rotatable actuator. The mounted pairs of arm/head structures project between the confronting disk surfaces of adjacent disks with the heads displaced from one another in a direction longitudinally of the arms and with the active faces of the heads pointing in opposite directions and in confronting or yielding contact with an adjacent disk surface. The magnetic heads are at different radial locations on respective confronting surfaces of adjacent disks of the disk stack as the actuator rotates, in all radial track positions except one track position.