JP2009066191A5

JP2009066191A5 -

Info

Publication number: JP2009066191A5
Application number: JP2007237793A
Authority: JP
Filing date: 2007-09-13
Publication date: 2010-09-30
Anticipated expiration: 2027-09-13

Claims

Insert at least one needle that passes through the needle thread and moves up and down, and a looper thread that moves forward and backward between the forward position and the backward position across the needle to form the needle thread and the double ring stitch. In sewing fabric with a sewing machine equipped with a looper,
In a state in which the looper Upon completion of sewing is in forward position, the engagement hook from the receiving females disposed in the retracted position side of the looper, the looper thread leading to the looper from the looped needle thread the hook is caught in the looper is forward along a path, the looper and looper thread remaining on the fabric side by the cutting with the followed backward by the looper thread of the hook of the hook which cleaves at receiving female part for engagement A first step of staying in the loop of captured looped needle thread;
A second step of changing the reciprocating path of the hook from the first path to the second path after the reciprocating movement of the hook;
A third step of driving the sewing machine for one stitch and swinging the looper to the forward position again with the looper yarn remaining on the fabric side held in the loop of the loop needle yarn captured by the looper;
After the second step and the third step, the hook is moved from the receiving knife to the looper thread that enters the looped needle thread captured by the looper and reaches the looper from the looped needle thread captured by the looper. A fourth step of moving forward along the second path to be engaged, and receiving the portion of each thread engaged with the hook by the backward movement of the hook , and cutting with a knife. How to prevent frayed seams.

Insert at least one needle that passes through the needle thread and moves up and down, and a looper thread that moves forward and backward between the forward position and the backward position across the needle to form the needle thread and the double ring stitch. In a sewing machine equipped with a looper,
A thread scissor including a receiving knife arranged on the retracted position side of the looper, and a hook that has a hook part for catching the thread at the tip and reciprocates from the receiving knife;
Path changing means for changing the reciprocating path of the hook to the first path or the second path,
In a state in which the looper Upon completion of sewing is in forward position, the receiving hook than females to forward along the first path, the hook is engaged with the looper thread leading to the looper from the looped needle thread caught in the looper, The loop of the needle needle loop in which the looper thread caught by the looper is cut by the knife by receiving the hook engaging portion of the looper thread by the backward movement of the hook, and cutting the looper thread remaining on the fabric side by the cutting. The hook is reciprocated and the hook reciprocating path is changed from the first path to the second path, and the sewing machine is driven by one stitch to swing the looper to the forward position again. The hook is moved forward along two paths , and the hook enters and engages with the loop needle thread captured by the looper and engages with the looper thread from the loop needle thread captured by the looper to the looper. the backward movement of the hook Seam fray prevention device, characterized in that the thread of the hook so as to cut at receiving female part for engagement.

Thread cutter
An operating piece fixed to the hook and having a first slot and a second slot along the longitudinal direction;
A circular support member that is inserted into the first long hole and the second long hole and supports the operation piece in a slidable manner;
A first drive member for driving the operating piece;
The route change means
A first guide surface for the first path and a second guide surface for the second path which are formed in one of the first long hole or the second long hole and are opposed in the longitudinal direction;
The stitch fray prevention device according to claim 2, further comprising a second drive member connected to the operating piece and engaging the first guide surface or the second guide surface with the support member.