Upper feed mechanism

Abstract

Abstract A SEWING MACHINE HAVING AN UPPER FEED MECHANISM ADAPTED TO BE USED INDEPENDENT OF OR IN CONJUNCTION WITH A CONVENTIONAL LOWER FEED. THE UPPER FEED DOG IS GIVEN ADVANCE AND RETURN MOVEMENT THROUGH A QUADRATIC LINKAGE WHICH IS ROCKED BY A PAIR OF ROCKER ARMS DRIVEN THROUGH A REGULATING MEMBER FROM AN ECCENTRICALLY OSICLATED PITMAN. A TIMING BELT TRANSMITS MOTION FROM THE SHAFT TO A SHAFT ON WHICH THE PITMAN ECCENTRIC IS MOUNTED. THIS LATTER SHAFT ALSO MOUNTS A SECOND TIMING BELT WHICH DRIVES A SECOND ECCENTRIC TO GIVE LIFT AND DROPPING MOVEMENT TO THE UPPER FEED DOG. THE REGULATING MEMBER MAY BE ADJUSTED TO CHANGE THE UPPER FEED EITHER SIMULTANEOUSLY OR INDEPENDENTLY OF THE LOWER FEED MECHANISM BY EITHER OF TWO REGULATING SCREWS OPERATING THROUGH A PLURALTY FO CRANKS AND COUPLES MOUNTED ON A PAIR OF CONCENTRIC SHAFTS. A FOOT PEDAL OPERATED LINKAGE TURNS THE INNER OF THE TWO SHAFTS, INDEPENDENTLY OF THE TWO REGULATING SCREWS, TO EFFECT A QUICK CHANGE OF THE UPPER FEED ONLY FOR AS LONG AS THE PEDAL IS DEPRESSED, RETURNING THE UPPER FEED TO ITS PRESENT AMOUNT UPON RELEASE THEREOF. AN INDICATOR SCALE AND POINTED SHOW THE DIFFERENCE IN FEEDS BETWEEN BOTTOM AND TOP FEED DOGS AS SET BY THE REGULATING SCREW THAT CHANGES THE UPPER FEED ONLY.

Inventors

• 👤 Erich M Willenbacher
• 👤 Karl-Heinz Michel
• 👤 Werner J Mayer

Bibliographic Details