Self-Tracking Print Band Drive
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
A modified crowned drive pulley can be used to maintain accurate print band alignment without excessive band tension. Referring to Fig. 1, print band 1 rotates about drive pulley 2 and idler pulley 3. Guide rollers 4 define the vertical location of the band. The surface of drive pulley 2 is slotted to form fingers 5 that can flex under band tension to effect or simulate a crowned pulley. Idler pulley 3 is allowed to "float" vertically to seek the level dictated by the band. Since a rotating belt will seek the highest point of the pulley crown, the print band constantly rides on guide rollers 4. High band tension is avoided by inward deflection of fingers 5. Band tension and tracking force on rollers 4 can be chosen by selecting the finger stiffness by means of size and shape. Fig.