GB1396544A - Dobby - Google Patents

Abstract

1396544 Dobbies STAUBLI LTD 23 Oct 1972 [21 Oct 1971] 48828/72 Heading D1E In a dobby, reciprocating draw beams 13, 14, and corresponding stationary beams 11, 12, have sets of projecting teeth 16 and 15 respectively and draw elements 9, 10 which are pivoted to a baulk 8 may be moved from engagement with the teeth of the associated stationary beam 11 to engagement with the teeth of the associated reciprocating beam 13 or vice versa when the two beams are aligned. The draw elements 9, 10 have rollers 17, 18 which engage the teeth 15, 16 and a pivoting lever 24 operated by reciprocating rods 23, 25, controlled by the pattern transfers the draw member from one beam to the other. Draw beams 13, 14 are driven along a curved track which for each draw element is an arc of a circle with its centre at the mid-point of the centres of rollers 17 and 18 of the other draw rod when engaged with a tooth 15 of the stationary beam 11. The draw beams have a dowell in their lower position. Draw rods 9, 10 may be quided by a cam surface parallel to the draw beam path. The draw beams may be rotatable about their longitudinal axis to prevent the draw rods slipping out of engagement. Alternatively, the wheels 17, 18 on the draw rods may be offset with respect to each other and the longitudinal axis of the draw rod (Fig 4, not shown).