Catch configurations for the pivot arms of a rotary dobby

Claim 1

A rotary dobby adapted for use in controlling the movement of a heddle in a weaving loom, comprising, an oscillating element adapted to be connected to a heddle frame and linked to an actuating element mounted on a main shaft of said dobby, a movable coupling element pivoted relative to a plate laterally offset to said actuating element, said moveable coupling element being subjected to elastic means to effect an angular connection of said plate with a disk firmly attached to said main shaft, two pivoting arms each including a catch for cooperatively engaging a pair of spaced binding surfaces of said plate, elastic means for normally engaging said pivoting arms so that said catches are urged toward said binding surfaces of said plate, means responsive to a reading-in device for urging said pivoting arms to space said catches from said binding surfaces of said plate, and said catch of each pivoting arm having a pair of external bearing surfaces and a pair of internal bearing surfaces which are defined by vertex angles (α, β, α' and β') of different values.