Abstract: A magnetic probe for sensing the passage of a moving magnetic element, comprising a radially magnetized cylindrical permanent magnet, formed of a flat sheet of elastomer bonded ferrite material magnetized across its smallest dimension and curled to cylindrical configuration, or formed in cup-shaped configuration. A magnetic collector core is mounted co-axially in one end of the magnet cylinder and has an axial pole piece of reduced diameter projecting to the other end of the magnet cylinder, and an electrical sensor coil encompasses the pole piece; the sub-assembly comprising the magnet, the core, and the coil is mounted in a cylindrical magnetic housing, with only high-reluctance flux paths between the inner surface of the permanent magnet and the housing.

Abstract: A speed switch control comprising a subfractional permanent magnet AC generator generating an AC signal varying in amplitude with saft speed variations; the AC signal is rectified and compared with a regulated DC reference to generate first and second threshold signals indicative of shaft speeds over and under a critical value. A switch actuator circuit develops "on" and "off" switch actuator signals, from the threshold signals to actuate a two-terminal solid state switch between on and off conditions; the "off" signal is continuous but the "on" signal is a high-duty-cycle semi-continuous signal including brief recurring "off" intervals. A power storage/supply circuit, connected in parallel with the switch terminals, which recharges during switch "off" intervals, affords the power supply for the threshold and switch actuator circuits.

Abstract: A speed-switch control comprising a multi-pole sub-fractional permanent magnet A.C. generator driven by a shaft; the generator develops an initial A.C. signal having an amplitude representative of the shaft speed, and that signal is applied to a threshold circuit where it is rectified and compared with a threshold amplitude correlated with a critical shaft speed range to generate a D.C. switch actuation signal. The D.C. switch actuation signal actuates a solid-state switching circuit to switch a controlled load, such as a safety interlock or alarm, into and out of an external operating circuit.

Abstract: A sub-fractional A.C. signal generator incorporating a stator assembly comprising a coil wound upon an annular bobbin of molded insulator material, a pair of annular magnetically premeable stator members having alignment apertures snap-fit onto integral bosses projecting from the bobbin, in concentric relation in a stator sub-assembly, the two stator members affording a multiplicity of individual pole pieces interleaved one-for-one around the outer periphery of the coil. The sub-assembly and an insulator barrier are press fit onto opposite ends of a cylindrical stator support member within which a sleeve bearing is mounted to provide a complete stator assembly. A drive shaft is journalled in the stator bearing and carries an annular permanent magnet which encompasses the stator members but is spaced therefrom by a uniform radial air gap. A housing affixed to the insulator barrier encompasses rotor and stator assemblies.

Abstract: A side access opening is provided in a side wall of a continuous loop tape cartridge which is normally driven in a forward direction by the capstan of a tape player through an access opening in its front wall to remove tape from a central hub at the inner convolution thereof and to return it to the hub at the outer convolution. A cooperating side drive mechanism is provided in the tape player housing adjacent the side access opening in the cartridge. The tape is driven in a reverse direction through the cartridge by the side drive mechanism of the player through the side access opening to remove tape from the hub at the outer convolution thereof and to return it to the hub at the inner convolution by being coupled to a vertical peripheral wall portion of the cartridge hub at a point spaced a predetermined distance from the axis of rotation of the hub. The coupling relation is effected either directly through the outer convolution of tape or directly to the rim of the hub or simultaneously through both means.