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 mobile device for awareness of language ability
Trading related to fund compositions
Air filter
Milk frother
Machine tool with an electrical generator for passive power generation
Plants and seeds of hybrid corn variety CH514730
Ignition device in particular for an internal combustion engine, and method for manufacturing same
  Randomly Featured Patents
Controlling database copyrights
High-throughput microbial culturing
Electron emission device, method for manufacturing the device, and electron emission display using the same
Temporary shelter
Terminal device and program
Plate heat exchanger
Power distribution system for a personal computer
Variable valve lift apparatus
Renal progenitor cells from embryonic stem cells
Liquid for ejection and method for ejecting bio-specimen