US Patent 7601218 Auto-tracking dispenser

A liquid dispenser. The dispenser includes a plurality of cartridges at least one of which allows selective deposition of the liquid onto a workpiece passing through a travel path between the cartridges. Spacing between the cartridges is moveable such that they are responsive to the presence or absence of or changes in thickness or planarity of the workpiece. A linear bearing cooperates with at least one of the cartridges to limit relative movement between them along a linear path. In one embodiment, the dispenser includes an applicator head configured to deposit the liquid includes a divergently-shaped flowpath.