Thread control for buttonhole sewing machine
OwnerArmand A. Dufaultinventor
Life of this patent
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Abstract
A system for controlling the starting end of a thread is disclosed in which air is provided via a conduit and nozzle to a point adjacent the needle and above the presser foot of the sewing machine. The arrangement is such that the air is controlled by a valve whose operation is in turn controlled by the position of the presser foot so that air is supplied only when the presser foot is raised and the sewing machine is in a stopped position.
Claims6
In combination with a sewing machine having an elongated frame with a bed plate mounted on a support table so that the elongated frame faces the operator, a reciprocable needle having an eye and a presser foot, a source of thread and means guiding the thread to and through said eye of the needle, means holding the thread out of the path of the presser foot comprising a source of air located adjacent the needle above the bed plate to direct the air away from the operator and toward the thread to cause the thread to project above the presser foot when the foot is above the bed plate and means to control the air supply only when the presser foot is above the bed plate.
Dependencies are inferred from the claim text.