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Patent Searching and Data


Title:
METHOD FOR DRAWING OUT OPEN RING BY SEWING MACHINE OF TWO NEEDLES AND THREE THREADS, DEVICE THEREFOR AND OPEN RING THEREOF
Document Type and Number:
Japanese Patent JPH05300991
Kind Code:
A
Abstract:

PURPOSE: To smoothly draw out a stable open ring in the sewing machine having two needles and one looper.

CONSTITUTION: An auxiliary blade 21 is provided in parallel in a looper 4, thereby an open ring connected to the looper 4 is supported so as not to be caught by the looper 4 by preventing the hanging-down caused by pushing the open ring into the lower part of a needle plate 3. In a pinhole of the needle plate 3, the tip of a slender plate 19 is protruded so as to be movable forward and backward, and performs a function as a claw. The sewing machine is provided with a thread tension utensil group for sewing and a thread tension utensil group for forming the open ring, it is switched to the thread tension utensil group for forming the open ring at the time of forming the open ring, and tension of one needle thread is maintained in the same way as the time of sewing, and on the other hand, tension of the other needle thread and tension of a looper thread are respectively made small and large. At the backward in the cloth feeding direction of the needle hole 13, a backward feeding tooth 16 for feeding out the open ring is provided, and a guide groove is formed toward the center of the backward feeding tooth 16 from the left side of the needle hole 13.


Inventors:
NISHIKAWA MASAHIKO
Application Number:
JP1992000110192
Publication Date:
November 16, 1993
Filing Date:
April 28, 1992
Export Citation:
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Assignee:
PEGASUS SEWING MACHINE MFG CO
International Classes:
D05B1/10; D05B61/00; D05B65/00; D05B73/12; D05B57/02; (IPC1-7): D05B61/00; D05B1/10; D05B73/12
Attorney, Agent or Firm:
佐藤 晃一