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:
Nov. 12, 1991
Filed:
Sep. 18, 1989
Rolf Jung, Waiolingen, DE;
Jack M Schwartzott, Norcross, GA (US);
Robert J Pieroni, Youngstown, NY (US);
Arnold Tobler, Upton, MA (US);
Eastman Machine Company, Buffalo, NY (US);
Abstract
A method and apparatus for supporting sheet material such as cloth during operations thereon such as cutting wherein a pattern is placed on a supporting surface provided with a plurality of pins extending through apertures in the surface, the pins are lowered below the surface for removal of the pattern whereupon sheet material is placed on the surface, typically a plurality of plies being layed up in a stack, and simultaneously the pins are moved through the sheet material to maintain alignment and matching of the plies in the stack. The pattern then is placed on the sheet material in a position determined by the location of the pins, and the material is shaped such as by cutting. A plurality of separate pin holding and supporting devices of narrow width are spaced lengthwise along the apparatus and independently movable lengthwise toward and away from each other. Pins of adjacent rows can be closely spaced together thereby achieving a grid pattern wherein the pins are relatively closely spaced. There is provided apparatus for developing a positive pressure which is employed to apply a flotation force to sheet material on the surface to facilitate movement of the material along the surface, apparatus for developing a negative pressure which is employed to apply a hold down force to sheet material on the surface to facilitate operating on the material, and apparatus for controlling selection of positive or negative pressure so developed.