Abstract: A cam controller for determining the operation of an electric motor is coupled with a stepping motor to provide predetermined positional movements of the cam controller in response to a desired electric motor operation control signal and in accordance with a programmed microprocessor determined comparison of the actual electric motor current with a requested current related to the desired operation control signal.

Abstract: An image input terminal (IIT) with automatic document handler for feeding documents to be scanned into registered position on the IIT platen. The IIT includes a pair of multi-element scanning arrays with cooperating scan lamp and optics on a movable carriage disposed in scanning relationship with the platen. Video image signals generated by the scanning arrays are initially processed in separate channels and then combined into a serial stream. The stream of video image signals may optionally be thresholded or screened to provide binary level image signals or converted to multi-bit gray scale.A control system including microprocessor provides timing and control signals for synchronizing operation of the scanning carriage, document handler, and image signal reading and processing together with electronic crossover between arrays to avoid loss of data, automatic signal gain control, and deletion of bad image signals or pixels.

Abstract: A professional audio tape transport capstan control system includes a single capstan continuously engaging a length of tape to provide bidirectional motion control in all modes of operation. A D.C. capstan drive motor is directly coupled to the capstan and energized for precise control over tape motion. A hybrid servo switches between digital position phase lock velocity control and analog constant acceleration control to provide both precise control over play speed and rapid acceleration. With acceleration to a stabilized play speed occurring in less than 0.5 sec an operator may treat the acceleration time as instantaneous for most applications.

Abstract: The present invention is a device for stopping a passenger conveyor.A stop pushbutton is depressed to deenergize a driving motor for an escalator and an operating winding for an electromagnetic brake. The electromagnetic brake has a mechanical braking means whose operations is opposed by the magnetic force of the operating winding. Then two timing relays are energized and also the brake operating winding is reenergized through a variable resistor to brake the motor with a low braking force. The timing relays are successively picked up after predetermined time intervals to increase the resistance of the resistor to increase the braking force stepwise by decreasing the current and hence the magnetic force of the operating winding. When the escalator reaches a predetermined low speed, the brake operating winding is again deenergized to apply the rated braking force to the motor until the escalator is stopped.

Abstract: A drive by means of an electric motor for trackless vehicles, in which the rotational speed adjustment takes place by changing the field energization of the electric motor, and with a separating clutch connected behind the motor as well as a changespeed transmission having at least two speeds in the forward driving direction. An energizing current controller for the field winding is provided whose energizing current-desired value is predetermined by another current controller to which are fed, on the one hand, the actual value of the armature current and, on the other, a desired value which is determined by the drive and/or brake pedal when the separating clutch is not actuated, and which is automatically determined by a synchronizing controller or is set to zero during the actuation of the separating clutch.

Abstract: A motor control system in which direct current is sequentially applied to portions of the motor stator windings in response to rotor position signals generated by Hall effect devices until the rotor has reached a desired angular velocity corresponding to the frequency of a source of reference pulses, at which time the portions of the stator windings are driven in a synchronous manner by pulses having a fixed duration and the same frequency as the reference pulses. In the synchronous mode the Hall effect signals are used only in conjunction with circuitry to determine whether or not the rotor is continuing to rotate at the desired, synchronous velocity. The motor is stopped by reverse application of direct current drive to the windings in the direct current drive mode and, again, in accordance with the position signals output from the Hall effect devices.