Resources Contact Us Home
Bi-directional registration of servo indexed webs

Image Number 3 for United States Patent #5000725.

A bag machine fabricates plastic bags by transversely cutting and sealing, at regularly spaced preselected locations, an elongate plastic web having graphic material repetitively printed thereon. In operation, the bag machine advances the web by a calculated draw length, and an optical sensor, sensitive to the passage of eyemarks printed in regularly spaced locations on the web, functions to ensure that the web is cut and sealed only at the desired locations. To avoid inaccuracies resulting from a gradual variance between the nominal draw length and the actual distance between eyemarks, a control system monitors the actual distance between eyemarks and sets the nominal draw length to the average actual spacing between eyemarks as measured over a preselected number of successive eyemarks.

  Recently Added Patents
System and method for optimizing use of plug-in air conditioners and portable heaters
Analogue-to-digital converter
Semiconductor device including multi-chip
Battery pouch sheet edge insulation
Apparatus and method for storing event information for an HVAC system
Cable exit trough with insert
Switchgear and method for operating switchgear
  Randomly Featured Patents
Adjustable stop assembly for a press
Fluorinated carbon polymer composites
System and method for providing an intelligent multi-step dialog with a user
Wiring substrate, method of manufacturing wiring substrate, and electronic apparatus
Method and apparatus for etching Si
Method of processing used batteries
Method in connection with engine control
Hitch for attaching a trailer to a bicycle
Discharge rate and pressure control solenoid valve