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:
Feb. 23, 1993
Filed:
Jun. 12, 1991
Donald C Fyler, Wellesley, MA (US);
Layton G Hale, Livermore, CA (US);
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
Abstract
The invention includes in one form a sewing machine, two trackers (mice) to track the ends of material-to-be-joined, and a controller for controlling stitch formation to achieve precise control of the material position, permitting desired easing (positive or negative). A long table is preferably used with a separation plate so that the two panels-to-be-joined can be laid out flat and separated during sewing. The mice slide in tracks so they will move in a straight line. The mice are adapted so that tension can be maintained and that the mice can be pulled back when the seam is done. Optical encoders are used so that the position of the mice, and thus endpoints of the panels, can accurately be determined. The sewing machine has an attachment that provides differential feed of the two plies in response to the desired and actual position of the stitches.