Abstract: The armature of a limited-rotation motor which rotates about an axis relative to a stator is extended axially beyond the stator between arcuate, non-magnetic capacitor plates disposed in a cylindrical array coaxial with the rotation axis. The capacitor plates are connected in a bridge circuit whose output is a selected function of armature displacement. The capacitor plates are installed at the end of the motor stator during assembly of the motor as tines of a unitary slotted bushing that is reamed simultaneously with the motor stator, following which the bushing is circumferentially cut to electrically isolate the bushing tines to form the individual plates.

Abstract: The armature of a limited-rotation motor which rotates about an axis relative to a stator is extended axially beyond the stator between arcuate, non-magnetic capacitor plates disposed in a cylindrical array coaxial with the rotation axis. The capacitor plates are connected in a bridge circuit whose output is a selected function of armature displacement. The capacitor plates are installed at the end of the motor stator during assembly of the motor as tines of a unitary slotted bushing that is reamed simultaneously with the motor stator, following which the bushing is circumferentially cut to electrically isolate the bushing tines to form the individual plates.

Abstract: A signal generator for producing signals indicative of the speed of tape driven reel to reel in a tape cassette transport in lieu of timing signals recorded directly on the tape is used to control the reel motors that drive the cassette. The tape-engaging drive wheel is designed to minimize slippage between the moving tape and the drive wheel so that the generator output accurately reflects tape speed.

Abstract: A line printer for printing successive lines of information on a ticket. As the ticket is guided toward ticket printing and advancing mechanisms, a first ticket sensor energizes a latch circuit and shifts the ticket advancing mechanism from a normally closed condition to an open condition. The ticket then moves freely into the printer to a predetermined position defined by a stop. A second ticket sensor at the stop is then actuated to close the ticket advancing mechanism and enable ticket advancement.

Abstract: An escapement mechanism for driving a shaft about an axis in a line printer each time a solenoid is actuated. An armature in the solenoid moves along a second axis which is normal to the axis of rotation and intersects it. An integrally molded escapement arm is pivotally mounted to the armature and also to a frame for rotation about a third axis which is parallel to the axis of shaft rotation and is spaced from the second axis. A resilient spring on the escapement arm engages a ratchet wheel mounted on a shaft. When the solenoid is actuated, the armature withdraws the escapement arm and the spring. When the solenoid is de-energized, a return spring on the solenoid advances the armature so the drive member engages the ratchet wheel and rotates the shaft. A second ratchet wheel oppositely oriented with respect to the first engages a positioning member on the escapement arm thereby to orient properly the shaft.