Sewing machine needle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 10, 1984
Grant Date -
N/A
app pub date -
Jan 8, 1982
filing date -
Jan 8, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sewing machine needle has a chamfer portion formed in its shaft which defines an interspace between the needle shaft and a thread running in an upward direction parallel to the needle shaft to permit a thread loop catching device to enter into the interspace during machine operation. The chamfer portion is formed by a portion of the needle shaft which is displaced with respect to the axis of the needle which extends substantially parallel thereto and yet which has substantially the same transverse cross-section as other portions of the shaft and by shaft transition portions which adjoin the displaced shaft portion which extend at an angle with respect to the needle axis. In this manner, a deep chamfer portion is obtained so as to increase the interspace between the needle shaft and sewing thread so that a reliable engagement of the sewing thread by the thread loop catching device can be achieved without the necessity of a so-called loop stroke. Moreover, sufficient resistance to buckling of the needle is achieved despite the increase in depth of the chamfer portion.
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