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AssigneePegasus Sewing Machine Mfg. Co., Ltd.
InventorMasahiko Nishikawa
Estimating the term…
A sewing machine possessing multiple needles and a single looper for forming a double chain stitch without an upper covering thread capable of drawing out a thread chain reliably and smoothly. By using an auxiliary blade disposed parallel to a looper, the thread chain consecutive to the looper is supported, thereby preventing the thread chain from being pushed down beneath a throat plate by descending needles. On the throat plate, a stitch formation tongue composed of a movable slender plate is provided, and this tongue is withdrawn when making the thread chain. The sewing machine is provided with tension regulators for sewing and for forming a thread chain respectively. In the tension regulators for forming the thread chain, the tension of the right needle thread is set lower than the tension of the looper thread. By use of a rear feed dog, the thread chain is drawn out through a guide groove at the left rear end of a needle hole toward the middle of the rear feed dog.
A method for drawing out a thread chain in a sewing machine which forms a double chain stitch without an upper cover thread through the cooperation of at least two needles and a primary blade of a looper, said method comprising the steps of:
A method for drawing out a thread chain in a sewing machine which forms a double chain stitch without an upper cover thread through the cooperation of at least first and second needle threads respectively provided in first and second needles and a looper thread provided in a looper, said method comprising the steps of:
A sewing machine for forming a double chain stitch without an upper cover thread through the cooperation of at least two needles and a primary blade of a looper and drawing out a thread chain, said sewing machine comprising:
A sewing machine for forming a double chain stitch without an upper cover thread through the cooperation of at least first and second needle threads provided respectively in at least first and second needles and a looper thread provided in a looper, said sewing machine comprising:
A sewing machine for forming a double chain stitch without an upper cover thread through the cooperation of at least first and second needle threads provided respectively in at least first and second needles and a looper thread provided in a looper, said sewing machine comprising means on the looper for supporting a thread chain adjacent to and at a cloth delivery side of the looper, a U-shaped needle hole formed in and defining right and left needle penetrating paths in said throat plate, each of said right and left needle penetrating paths having a needle penetrating portion of an enlarged diameter, one of said needle penetrating portions having a straight inside edge extending along the needle penetrating path, and a rear feed dog disposed behind said needle hole with respect to a cloth feeding direction.
Dependencies are inferred from the claim text.