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:
Jul. 03, 1979
Filed:
Jan. 06, 1978
Edward F Meihofer, Norfolk, MA (US);
Butler Automatic, Inc., Canton, MA (US);
Abstract
A web winder of the center wind type drives the web roll through a controllable variable speed mechanical transmission whose input shaft is turned by a variable slip torque modulating device whose torque coupling varies in accordance with the output of a web tension sensor upstream from the web roll to immediately change the angular velocity of the roll to compensate for sudden tension upsets in the web. The amount of slip in that device is detected and compared with a selected reference slip to develop an error signal for controlling the gear-in ratio of the transmission which slows the angular velocity of the roll to compensate for the gradual web tension increase caused by increasing roll size. Thus the winder's speed characteristics are matched at the input of the transmission to the clutch characteristics at all roll diameters so that the winder requires only a minimum size torque modulating device for given web speed and tension conditions.