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US 4,535,711 AGranted
Looper-cam shifting arrangement for a sewing machine
AssigneeThe Singer Company
InventorStanley J. Ketterer
Life of this patent
Estimating the term…
Abstract
A hand operated sewing machine with opposing loop seizing points for forming chain stitches. A work feeding plate reciprocates with a plate member about a pivot. A flexible upstanding portion at one end of an arm is biassed by the moving plate member causing the other arm end to bias a cam affixed to the loop seizing points. This bias determines the cam path taken by a drive pin that provides motion to the loop seizing points.
Claims5
In a sewing machine;
- a frame;
- a driving member;
- a needle;
- means operably connected to the driving member for reciprocating the needle;
- a looper and cam assembly mounted for pivotal movement on the frame in a plane extending transversely therein, the looper being formed with a pair of loop seizing points and the cam including a pair of intersecting cam tracks;
- a longitudinally extending actuator in the frame operably connected to the driving member and engageable with the cam on said cam tracks for imparting pivotal movement to said assembly and disposing the looper points for cooperation with the needle in the formation of chain stitches;
- a longitudinally extending bed;
- means for moving work laterally on the bed including a longitudinally extending member which is operably connected to said driving member for actuation thereby and is mounted in the frame for pivotal reciprocable movement about an axis extending perpendicular with respect to the plane of the bed;
- and an arm including a resiliently flexible portion, the arm being operably connected at one end to the longitudinally extending pivotable reciprocable member for flexure thereby, and at the other end to the looper-cam assembly for biasing the looper-cam assembly in opposite directions according to the position of the longitudinally extending pivotably reciprocable member to thereby control movement of the said actuator between the cam tracks.
6 more elements
Dependencies are inferred from the claim text.