The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
Jun. 18, 1996
Applicant:
Inventor:
Assa Bar-Lev, Chestnut Hill, MA (US);
Assignee:
ECRM Incorporated, Tewksbury, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03D / ;
U.S. Cl.
CPC ...
396612 ; 355 27 ; 226195 ; 492 28 ; 492 30 ;
Abstract
In a system for transporting film materials, rotation of the transported film caused by uneven stress across a width of the film is eliminated by providing a pinch roll drive in which the driven roll is a precision metal roll and the non-driven roll is a rubber roll, the outer cylindrical surface of which is defined by a plurality of axially-spaced annular ribs. Accumulated error is removed at regular intervals by braking the film to cause correction of slippage. Feed under uniform stress is achieved by forming a dancer roll film loop and correcting for differential alignment of the various transport rolls by displacing a portion of one side of the loop.