Fully rotating hook for a lock stitch sewing machine

Details Fully rotating hook for a lock stitch sewing machine Fully rotating hook for a lock stitch sewing machine

1987-05-26

1988-12-27

Falik, Andrew M.

Sewing

Elements

Revolving hooks

112256, D05B 5708, D05B 5726, D05B 7102

Patent

active

RE0328090

ABSTRACT:
A fully rotating hook [includes an outer member or rotary loop taker having a track groove therein and an inner shuttle member or bobbin case a projection extending into the groove. A spaced relation between the track groove and the projection is maintained by feeding compressed air into a clearance therebetween.] assembly for a lock stitch sewing machine having an inner bobbin case for supporting a thread bobbin with a track projection extending circumferentially around the bobbin case, an outer loop taker mounted about the bobbin case and having a track groove extending circumferentially around an inner peripheral surface thereof and air passages for injecting compressed air into a clearance between adjacent surfaces of the projection and the groove. The air passages can be formed in the groove of the loop taker and in the projection. The projection includes a groove extending radially inwardly from a radially outermost surface and a plurality of exhaust holes extend from the groove to axial end surfaces of the projection. Compressed air is supplied to the air holes opening into the groove to thereby create an air film between the surfaces of the projection and the confronting surfaces of the groove.

REFERENCES:
patent: 730692 (1903-06-01), Parkes
patent: 1188818 (1916-06-01), Parkes
patent: 1596487 (1926-08-01), Hohmann et al.
patent: 2907165 (1959-10-01), Adams et al.
patent: 3146744 (1964-09-01), Bradshaw
patent: 3509840 (1970-05-01), Rovin
patent: 3769925 (1973-11-01), Von Hagen

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