A controllable length conveyor suitable for use in a packaging machine comprises a pair of conveyor belts which are continuously driven in a given direction at a selected speed. The conveyor belts are mounted on a reciprocable frame and are arranged such that the product being conveyed resides between...http://www.google.es/patents/USRE35243?utm_source=gb-gplus-sharePatente USRE35243 - Controllable length conveyor
