Abstract: A system including a self-contained electromechanical control mechanism and method of operation is provided for controlling the tension and lateral position of a web or tape as it is motor driven to pass over a series of rollers. This device comprises mechanical means in which two pairs of rollers are mounted in upper and lower positions on a metal frame, the upper rollers being disposed on a pivotted plate having cantilever projections to which piezoelectric load cells are attached. Changes in the tension of the web or tape is sensed by the load cells connected in a bridge circuit, which sends a signal to a microprocessor, the output of which controls the driving motor or a clutch to compensate for the change in tension. Simultaneously, the position of the tape is controlled by another device, whereby the edge of the tape or a line on the tape passes through additional sensing means. This sends another signal to the microprocessor which energizes a linear actuator to correct the misalignment of the tape.