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:
Oct. 22, 1991
Filed:
May. 29, 1990
John W Tidland, Vancouver, WA (US);
Reinhold A Schable, Washougal, WA (US);
Casey M Vander Bom, Hillsboro, OR (US);
Borendra K Biswas, Vancouver, WA (US);
William R Miller, Portland, OR (US);
Tidland Corporation, Camas, WA (US);
Abstract
A web slitting machine for cutting a web or roll of material includes an upper carriage assembly joined to a lower blade holder assembly by a selectively removable guide key which is milled to provide a predetermined cant angle for the blade. The blade is lowered into position by a piston which is rectangular and includes a torsion-resisting sleeve to prevent rotation of the piston about its vertical axis. A pneumatic control provides a plurality of control modes whereby the blade may be raised and lowered with or without locking the upper carriage assembly to its transverse bar and vice-versa. A unique side shift adjustment is provided whereby the blade may be shifted to a half-stroke position and the upper carriage locked when the blade is positioned against a lower knife. This ensures that the pressure of the blade against the knife is the pressure exerted at the mid point of the stroke. A parallelogram linkage biased by a spring provides a shock absorber for maintaining blade/knife contact in the presence of webs moving at high speed.