Importance

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Abstract

This invention relates to a rotation dobby having a key coupling between a drive shaft and an eccentric device for the movement of the heddles, the key being mounted under spring action in a radially extending recess in an eccentric disk arranged in a crank arm and being engageable and disengageable in accordance with a pattern into and out of an axially extending groove of the drive shaft at two diametrically opposite coupling places by means of a shift rod which can be controlled in accordance with a pattern and engages via a coupling member into a groove of the key which is open in the axial direction of the drive shaft. In order to simplify the engagement and disengagement, the key is pressed, in engaged position, by a compression spring into the groove of the drive shaft, the spring force of the spring being greater than the centrifugal force which acts on the key during revolution, two spring-loaded lock slides which receive the outer end of the disengaged key between them being provided on each crank arm at each coupling place.

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First Claim