ANORDNING VID SYMASKINER FOR REGLERING AV STYGNLENGDEN OCH UTVEXLINGEN VID MASKINENS REGLERSYSTEM FOR ARBETSSTYCKETS MATNING

A stitch length and cam feed mode ratio control mechanism for the work feed regulating system of a sewing machine that includes a feed regulator shaft rotatably mounted in the frame of the machine operably connected to a feed dog and adapted to influence movement imparted thereto so as to cause same to transport work transversely across the work supporting bed of the machine by predetermined incremental distances. A feed regulator lever arm is secured to the regulator shaft. A floating link member is carried at one end thereof by an element associated with the cam feed linkage system and is provided at its other end with a pin positionable along said feed regulator lever arm and engageable therewith. Manually operable means are provided for guiding said pin along the feed regulator lever arm for stitch length selection and for simultaneously establishing the proportionate amount of motion transmitted from the feed cam to the regulator shaft, the radius of curvature of the feed regulator lever arm and path of movement of said pin being such as to enable the positioning of the pin along the lever without effecting angular movement of the said lever arm when a portion of the cam is being tracked which dictates a zero stitch length. The cam, while in any position other than the zero position, causes the pin to be urged against the said lever arm so as to rotate same and the regulator shaft by an amount representative of the radial location of the pin along the lever.