THREADING DEVICE FOR LOWER LOOPER OF SEWING MACHINE Russian patent published in 2015 - IPC D05B57/02 

FIELD: textiles, paper.

SUBSTANCE: threading device for lower looper of the sewing machine is proposed. The looper thread passes through the eye of the lower looper on the lower side of the needle plate. The threading device comprises: a first movable element with a threading element attached to the one its end, and the threading element has a hooked part which may be inserted into the eye of the lower looper; a second movable element which is connected to the first movable element so as to be able to move in a direction opposite to that in which the first movable element moves, and the control element is connected to it on the same side as the hooked part, and the locking lever having in its lower part a convex part which engages with the cam groove with a groove attached to the main shaft, and in its upper part a protruding part which comes into contact with the control element. When the convex part of the locking lever is engaged with the groove, the control element and the protruding part of the locking lever are separated from each other and thus movement of the second movable element is not limited.

EFFECT: device enables to thread a yarn in the lower looper in a safe and reliable manner by a reliable protection of the main shaft from rotation when the threading operation is performed in the lower looper.

3 cl, 11 dwg