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. 03, 1989
Filed:
Feb. 24, 1989
Arthur F Bagnall, Manchester, GB;
Spencer Wright Industries, Inc., Dalton, GA (US);
Abstract
A tufting machine having laterally shifting needles has a controlled amount of yarn fed to the needles, the amount of yarn being appropriate for the insertion of a diagonal back stitch such as arises during lateral shift of the needles relative to a backing material during the tufting operation. The yarn is wrapped about a plurality of rotating feed rollers each driven at a constant speed, the rollers having a smooth surface so that the yarn slips on the rollers until the needles induce sufficient tension on the yarn to cause it to grip and be driven by the rollers. The speed of the rollers is greater than the required to accommodate the yarn requirements of the needles if no slippage occurred between the yarn and the rollers. An additive tension may be applied between the feed rollers and the needles by a leaf spring and an anvil against which the leaf spring is biased, the yarn being fed between the anvil and the spring.