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
Camera body, and camera system
Acoustic reconfiguration devices and methods
Method for conductivity control of (Al,In,Ga,B)N
Chair
Lubricating oil compositions
Monitoring system
Method and system for processing dictated information
  Randomly Featured Patents
Beverage container
Residua demetalation/desulfurization catalyst
Reflective sheeting for tractor-trailer
Method and apparatus for monitoring and controlling the production of composite filter mouthpieces for cigarettes or the like
Delivery in session initiated protocol (SIP) conferencing
Method and apparatus for detecting the thermal characteristics of a subsurface formation in situ
Method of treating wastewater containing hardly decomposable harmful substances
Calorimeter
Acousto-electric transducer
Bicycle handlebar conducive to rider aerodyanmic efficiency