Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Web handling apparatus










Image Number 7 for United States Patent #3948425.

A web handling mechanism is described for incrementally feeding a web of stretchable material (e.g., plastic film) to a processing station. The web feed rollers are driven by a motor incorporated in a servo system which electronically controls the feed rate, length of increment, dwell at processing station, etc. Variations in the speed and elasticity of a moving web are accommodated by means of a vacuum box adapted to accumulate a loop of the web material in the box and maintain proper tension on the web as supplied to the feed rollers. A detector in the vacuum box responds to a predetermined length of web accumulated in the box to trip a control circuit which actuates the feed roller motor to move the desired length of web through the processing station and then stop for a preselected interval. The circuit also controls the processing station to synchronize its operation with that of the web feed and the entire sequence is repetitive at high speed. Complete flexibility of operation is provided by the control circuit.








 
 
  Recently Added Patents
Method and system for a low-power client in a wide area network
Catalysts for polyurethane coating compounds
DNA promoters and anthrax vaccines
Method and system for prioritizing points of interest for display in a map using category score
Memory device, test operation method thereof, and system including the same
Early kill removal graphics processing system and method
Card reader device
  Randomly Featured Patents
Threshing unit of an axial grain combine harvester
Device and methodology for correcting scoliosis
Locking device for two-wheeled vehicle
Low viscosity stable non-aqueous suspension containing organophilic clay and low density filler
Electromagnetic launcher with improved rail energy recovery or dissipation
Pixel circuit, active matrix apparatus and display apparatus
Process for preparation of carbonyl compound and pro-oxidant for preparation of carbonyl compound
Movable feeder floor for combines
Crimping jaw assemblies for forming package closures
Exhaust gas purification system for internal combustion engine, and apparatus and method for controlling the same