DISPENSING SYSTEM WITH MIXING MODULE MOUNT, DRIVE AND TIP TREATMENT

摘要

A chemical (e.g., foam precursor) dispensing system having a mixing module valve/purge rod (or valving/purge device) reciprocating drive system that comprises a crank and slide mechanism in an effort to prevent lock up. The same drive system also preferably is used to reciprocate a mechanical tip contact cleaner as in a reciprocating brush. The mixing module is preferably in the form of a cartridge which is received within an adjustable, finger releasable mounting region of the dispenser housing so as to properly align the mixing module relative to chemical and solvent feed ports. To further maintain a clean dispenser tip a solvent feed system is provided which includes a double front cap wall arrangement for bathing the free end of tip and the tip outlet region of the mixing module.