Incrementally rotatable thread feeding device for sewing machines
AssigneeSuzuki Manufacturing, Ltd.
InventorKouichi Sakuma
Life of this patent
Estimating the term…
Abstract
A thread feeding device for a sewing machine, is simply constructed but can feed a plurality of looper threads individually in amounts necessary for each seam with adjustment of the tensions of the looper threads by one adjustment knob. The thread feeding device includes a shaft fixed on the machine body orthogonally of the feeding direction of a plurality of threads. A rotor is mounted on the shaft as to rotate intermittently in one direction only. A plurality of thread holders are provided on the rotor for holding and letting off the threads individually. In each thread holder the radius from the center of rotation of the rotor to the position where the thread is held is set to a value corresponding to the individual length of feed of the thread.
Claims5
A thread feeding device for mounting on a sewing machine to withdraw threads from wound packages for feeding to a stitching mechanism on the sewing machine, said thread feeding device comprising:
- a rotor mounted on the sewing machine for rotation about a longitudinal axis perpendicular to the direction of feed of the threads;
- drive means for rotatably and intermittently driving said rotor in increments of rotation;
- plural thread holders mounted on said rotor for rotation therewith, each of said thread holders supporting at least one of the threads at a support point radially distanced from said longitudinal axis, each of said thread holders drawing off a predetermined length of the threads responsive to each increment of rotation of said rotor, whereby said predetermined length is determined for each thread holder by the degree of rotation in one of said increments of rotation.
Dependencies are inferred from the claim text.