Key coupling for a rotation dobby

Details Key coupling for a rotation dobby Key coupling for a rotation dobby

1985-01-25

1986-12-02

Jaudon, Henry S.

Textiles: weaving

Warp manipulation

Shedding

D03C 100

Patent

active

046257675

ABSTRACT:
An eccentric ring is rotatably supported between a drive shaft and a connecting rod. Two coupling keys are independently radially movably supported on the eccentric ring. The first key, during a coupling operation, is radially moved by an inner cam and is held in engagement with a groove in the shaft during a 180.degree. rotation thereof. The second key can move radially between positions respectively engaging the groove and an outer cam on an indexing ring and, for a holding-still phase, is moved outwardly by an edge of the shaft groove into an enlargement in the outer cam. Through the second key being in the enlargement and through a cam on the indexing ring which engages a gap between two noses on the eccentric ring, the eccentric ring is held against rotation. When the first key is moved inwardly, an edge of the groove engages it and thus rotates the eccentric ring and the second key, which slides on a ramp of the enlargement and is moved into the shaft groove. The lifting unit operates without springs moving the keys.

REFERENCES:
patent: 3724511 (1973-04-01), Kleiner
patent: 4493346 (1985-01-01), Speich

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