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
Buckle (tube)
Method, system and computer program product for managing funds in custodial deposit accounts
High-voltage AC light-emitting diode structure
Fusion of road geometry model information gathered from disparate sources
Systems and methods for managing fleet services
Media identification system with fingerprint database balanced according to search loads
Liquid-filled protein-phosphatidic acid capsule dispersions
  Randomly Featured Patents
Gas density transducer
Quinolylmethoxyphenylacetic acid acylamides and ureas
Method and apparatus for maintaining optical alignment for free-space optical communication
Tin promoted iridium catalyst for carbonylation of lower alkyl alcohols
Adjustable diffusers
Reflective pattern with coded beginning and end formed on the surface of a sheet handling cylinder for detecting the presence and position of the sheet
Plasma ignition system for an internal combustion engine
Eight speed automatic transmission
Volumetric pump valve
Connection system for flexible tubing