| 摘要 |
A drive connection for reciprocating a connecting rod from an intermittently rotating drive shaft through an eccentric member to manipulate a harness frame of a textile loom from one shedding position to another, includes a drive ring fixed to the drive shaft and a pawl pivotably mounted on the eccentric member for movement into and out of engagement in opposed recesses in the drive ring during dwells in the intermittent shaft rotation to connect or disconnect the eccentric member and the drive ring. The pawl is biased toward engagement in the recesses with opposed shifting levers being provided for actuating selective disengagement of the pawl from the recesses. A pivotable blocking device enables alternate engagement of the switching levers into pawl disengaging position. A pair of cam lobes formed on the drive ring for integral rotation with the drive shaft operate on the switching levers to permit intermittent shifting of the blocking device between blocking and non-blocking positions with respect to the shifting levers in precisely timed relation to the drive shaft rotation.
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