Conveyors: power-driven – Conveyor section – Unit load conveying surface means moved about an endless or...
Patent
1994-01-06
1995-02-14
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Unit load conveying surface means moved about an endless or...
198832, 198834, 198842, B65G 4784
Patent
active
053886852
ABSTRACT:
A conveyor and method for preventing stick-slip friction conditions from exciting the conveyor into surging and for preventing surging vibration from adversely affecting operation of the conveyor. The conveyor has a pair of endless, flexible roller chains that are laterally spaced apart and carried on sprockets keyed to a drive shaft that is in communication with a drive at one end of the frame and sprockets keyed to a take-up shaft at the opposite end of the frame. Preferably, the take-up shaft is split into two shaft sections rotatively secured adjacent their ends by a pair of bearings on a mounting block to permit each conveyor chain to move on its idle sprocket independently of the other chain. The conveyor components are selected to provide a combination of chain stiffness and conveyor mass moment of inertia at maximum payload that produces a conveyor having a high enough natural frequency to prevent stick-slip friction conditions from exciting the conveyor chains into surging. Should a conveyor possess a natural frequency falling within the range of natural frequencies causing the conveyor to be susceptible to surging, a dampener that includes a flywheel disc coupled to the conveyor take-up shaft by a spring is attached to one or preferably both ends of the take-up shaft of the conveyor for preventing stick-slip from exciting the conveyor chains into surging and reducing the amplitude of any surging vibrations which might occur so they do not adversely affect operation of the conveyor.
REFERENCES:
patent: 2932381 (1960-04-01), Kinnicutt et al.
patent: 4037334 (1977-07-01), Plemitscher
patent: 4825999 (1989-05-01), Hammer
patent: 4934515 (1990-06-01), Linden
patent: 5029691 (1991-07-01), Fein et al.
patent: 5188219 (1993-02-01), Mitsumoto
Litton Industrial Automation Systems Inc.
Valenza Joseph E.
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