DEVICE FOR STITCH STROKE REGULATION Russian patent published in 2012 - IPC D05B27/22 

FIELD: mechanics.

SUBSTANCE: device mostly serves for use in lockstitch sewing machines. Stitch stroke regulation device contains the handle for material movement control, three-centered latch located in the main shaft of sewing machine interacting with the pusher the bottom end of which is connected with the hinge joint to balancing arm of the advancing shaft and in the middle part through the connecting link of swinging cross-arm. The reference spring-loaded three-port arm is simultaneously kinematically linked to the spring-loaded reverse feed arm and latch of smooth stitch stroke regulation contacting with one port of spring-loaded three-port arm mounted on the leading axle with possibility of longitudinal movement, second port of which contacts with one port of swinging cross arm that is also mounted on leading axle. Its third port is outfitted with the socket which is entered by the finger of longitudinal movement drive made as gear and rail set drive gear of which is mounted on the axle of the handle for material movement control, and the rail is outfitted with said finger. The latch of smooth stitch stroke regulation is made in form of flat surface located at the angle to the axle of the main shaft of sewing machine. The device is outfitted with error compensation unit in dimension chain of its kinematical connection made in form of length-adjustable, screwed into second port of cross arm screw with spherical butt end interacting with control port of reference spring-loaded three-port arm. The interaction of said chains is performed by means of its power contact.

EFFECT: proposed device in comparison to the known ones gives positive effect consisting of producibility of assembly parts and convenient calibration of sewing machine.

2 cl, 2 dwg