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
Image display device and capsule endoscope system
ZNF217 a new prognostic and predictive biomarker of recurrent invasive and metastatic phenotypes in breast cancer
Optical modulation element
Contactless electrical connector for an induction sensor, and sensor including such a connector
Pausing a VoiceXML dialog of a multimodal application
Method for manufacturing photoelectric conversion device
Ventilated vacuum commutation structure
  Randomly Featured Patents
Elevator controller
Production of fine-grained cast charges with unoriented crystal structure of TNT or explosive compositions containing TNT
Electrophoresis display panel
Photosensitive material processing method and photosensitive material processing apparatus
Propulsion device for automobile with portal axle comprising an electrical machine
Method and apparatus for storing and selectively retrieving product data by correlating customer selection criteria with optimum product designs based on embedded expert judgments
Spotting fluid for differential sticking
Wideband temperature compensated resonator and wideband VCO
Metallized interconnection structure and method of making the same
Synchronous semiconductor memory device performing data output in synchronization with external clock