Patent ID: 8180242

Claim:
A reproduction apparatus, comprising: a) a first print engine comprising: 1) a first dielectric support member (DSM) having a plurality of frame markers corresponding to a plurality of frames; 2) a first motor coupled to the first DSM for moving the first DSM when enabled; and 3) a first frame sensor coupled to a first controller and configured to provide a first frame signal, based on the first DSM's plurality of frame markers, to the first controller; b) a second print engine coupled to the first print engine and comprising: 1) a second DSM having a plurality of frame markers corresponding to a plurality of frames; 2) a second motor coupled to the second DSM for moving the second DSM when enabled; 3) a second frame sensor configured to provide a second frame signal, based on the second DSM's plurality of frame markers; and 4) a controller coupled to the first motor, the first frame sensor, and to the second motor and the second frame sensor, wherein the controller is configured to: i) monitor a first frame signal from the first frame sensor; ii) monitor a second frame signal from the second frame sensor; iii) determine an offset for each of corresponding pairs of frames from the plurality of frames of the first and second DSM's; iv) compare the determined offset for each corresponding pair of frames to a target offset; and v) adjust a velocity of the second print engine DSM based on the comparison of the determined offset and the target offset to maintain synchronization between the first and second print engines on a frame by frame basis.