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:
Dec. 11, 1984
Filed:
Jul. 30, 1982
Kurt Vollmar, Weilerbach, DE;
Abstract
A sewing machine includes a presser foot which is driven on a main shaft by an eccentric drive which drives through a toggle mechanism to a crank lever driver which effects the raising of the presser foot synchronously with the upward movement of a sewing machine needle so as to release a workpiece for movement relative to the needle. The presser foot is biased downwardly by a spring which may be adjusted as to its tension. During a sewing operation a driver is moved to a position only slightly disengaged from the lifting surface of the presser foot and during periods of engagement of the presser foot with the workpiece the toggle mechanism ensures that the presser foot engages the workpiece gently, irrespective of the adjusted amount of total lift of the presser foot by the drive mechanism.