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
Apparatus and method for recording reboot reason of equipment
Digital broadcasting system and method of processing data
Method for operation of multi-layer-multi-turn high efficiency inductors
Haworthia plant named `CAPETOWN`
Secure soft SIM credential transfer
Integrated circuits with magnetic core inductors and methods of fabrications thereof
Sealing member for piezoelectric resonator device, and piezoelectric resonator device
  Randomly Featured Patents
Variants of pigment epithelium derived factor and uses thereof
Programmable frequency sine wave signal generator
Remaining electrical charge/remaining capacity estimating method, battery state sensor and battery power source system
Scanning system with adjustable light output and/or scanning angle
Irradiator for dosimeter badges
Toothbrush
Method of forming a through hole by laser drilling
Energy management application server and processes
Method and system of handling document operation requests on documents having large collections with constrained memory
Money validator