Sewing machine with a device for guiding an upper thread
AssigneeJanome Sewing Machine Co., Ltd.
InventorsSusumu Hanyu, Mikio Koike
Life of this patent
Estimating the term…
Abstract
A thread guiding device in a sewing machine comprising a guide path for guiding an upper thread from a thread source to a needle and defined by a first thread guide, a pair of discs for releasably holding an upper thread, and a second thread guide formed by a spring hook of a thread tension spring member and an end portion of a take-up lever, the first and second thread guide and the thread tension spring member lying in a common plane to define a straight-line guide path.
Claims17
A device for guiding an upper thread through a guide path in a sewing machine from a thread source to a needle having a needle eye through which the upper thread extends, said device comprising:
- a take-up lever including a thread holding end portion having an opening for receiving the upper thread, said take-up lever having a predetermined position in the guide path in which the upper thread passes through said opening;
- first means for moving said take-up lever into and out of said predetermined position;
- thread tension spring means having end portion means with opening means facing said opening in said thread holding end portion of said take-up lever;
- and
- second means for moving said thread tension spring means between a stitching position and a position in which said thread tension spring means and said take-up lever are substantially lined up in a common plane when said take-up lever is in said predetermined position thereof to facilitate the insertion of the upper thread.
A method of guiding an upper thread through a guide path in a sewing machine including a take-up lever and thread tension spring means, said method comprising the steps of:
- guiding an upper thread from a thread source through the guide path to a needle eye and the needle eye;
- moving the take-up lever into and out of a predetermined position in the guide path in which the upper thread passes through an opening in a thread holding end portion of the take-up lever;
- moving the thread tension spring means between a stitching position and a position in which the thread tension spring means and the take-up lever are substantially lined up in a common plane when the take-up lever is in the predetermined position thereof, the thread tension spring means having thread holding portions arranged to oppose the thread holding end portion of the take-up lever.
A sewing machine in which an upper thread is guided from a thread source to a needle having a needle eye, said sewing machine comprising:
- thread tension adjusting means including a pair of discs for releasably holding the upper thread with an adjustable tension, said thread tension adjusting means being arranged between said thread source and said needle;
- first guide means including a first thread guide arranged between said thread source and said thread tension adjusting means for guiding the upper thread from said thread source;
- thread tension spring means including a spring member having a spring hook end with an opening therein, said spring member being arranged between said thread tension adjusting means and said needle and being laterally movable within a predetermined range in a horizontal plane;
- a thread take-up lever having an end portion with an opening provided therein, and arranged between said thread tension adjusting means and said needle, said thread take-up lever being laterally movable in a predetermined range in a horizontal plane;
- first means operatively connected to said thread take-up lever for moving the same;
- second means operatively connected to said spring thread tension means for moving the same;
- program operated control means for actuating said first and second moving means to move said spring thread tension means and said thread take-up lever to a position in which spring hook end and said end portion cooperate with each other to form a second thread guide;
- said first thread guide, said pair of discs, said second thread guide, and said needle being arranged in alignment in a common plane to define a straight line thread guide path in the absence of the upper thread to facilitate the insertion of the upper thread.
Dependencies are inferred from the claim text.