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:
Jun. 27, 1978
Filed:
Dec. 16, 1974
Fritz Gegauf, Steckborn, CH;
Abstract
The device is incorporated in a sewing machine having an arm enclosing and rotatably mounting an arm shaft connected to the sewing mechanism, a drive wheel rotatably mounted on the arm shaft and driven in any suitable manner, and a thread winder including a wheel selectively engageable with the drive wheel. A clutch ring surrounds the arm shaft and is pivotal on a pin extending diametrically of the arm shaft, the clutch ring having a trapezoidal engaging cam engageable in trapezoidal recesses in the drive wheel. A flat spring biases the clutch ring normally to couple the drive wheel to the arm shaft. When the thread winder is moved into a position adjacent a fixed stop, a release stirrup engages the clutch ring and pivots it to a position disconnecting the drive wheel from the arm shaft. Another spring biases the release stirrup away from the clutch ring. The increasing diameter of the thread wound on a bobbin on the thread winder, in cooperation with the fixed stop, gradually moves the thread winder away from the fixed stop and, after a predetermined such movement, the thread winder is effectively uncoupled from the drive wheel and may be swung to a position wherein the stirrup member releases the clutch ring for spring biased reengagement with the drive wheel to automatically recouple the drive wheel to the arm shaft.