Multiposition dobby

A dobby for controlling a multiposition heddle frame, comprising first and second lifting units which have respective movably supported first and second drive members, first and second levers respectively supported for pivotal movement about first and second stationary axes, said first and second levers being respectively pivotally coupled to said first and second drive members at respective locations spaced from said first and second axes, movement of said first and second drive members respectively effecting pivotal movement of said first and second levers, a third lever pivotally supported on said first lever at a first location spaced from said first axis, an elongate bar having one end pivotally supported on said second lever at a location spaced from said second axis and the other end pivotally supported on said third lever at a second location spaced from said first location, a connecting rod pivotally supported on said third lever at a third location spaced from said first location, and means operatively coupling said third connecting rod and said heddle frame for effecting movement of said heddle frame in response to movement of said third connecting rod effected by pivotal movement of said third lever.

A dobby for controlling a multiposition heddle frame, comprising first and second rotation lifting units arranged adjacent each other on a common rotationally driven drive shaft and respectively having first and second connecting rods which extend and are supported for movement in directions generally radial of said drive shaft, a first lever supported for pivotal movement about a stationary axis and pivotally coupled to said first connecting rod at a first location spaced from said stationary axis, radial movement of said first connecting rod effecting pivotal movement of said first lever, a second lever pivotally supported on said first lever at a second location spaced from said stationary axis and pivotally coupled to said second connecting rod at a third location spaced from said second location, radial movement of said second connecting rod effecting pivotal movement of said second lever with respect to said first lever, a third connecting rod pivotally supported on said second lever at a fourth location spaced from said second location, and means operatively coupling said third connecting rod to said heddle frame for effecting movement of said heddle frame in response to movement of said third connecting rod effected by pivotal movement of said second lever.