(57) A dobby (10) including a vertical lever (18) connected with a heald frame (12) and
having hook levers (28a, 28b) respectively and pivotally secured to both ends thereof,
knife hooks (32a, 32b) respectively and pivotally attached to both ends of a swing
lever (34a, 34b), which is swung in such a way that both ends thereof move alternately
toward and away from the vertical lever (18), and engageable with their corresponding
hook levers (28a, 28b), and a command device adapted to control the engagement between
the hook levers (28a, 28b) and their corresponding knife hooks (32a, 32b) so as to
move the heald frame (12) up and down for production of fabric of a desired pattern.
The knife hooks (32a, 32b) are eccentrically and pivotally secured on their corresponding
end portions of the swing lever (34a, 34b) in order to ensure smooth engagements between
the hook levers (28a, 28b) and their corresponding knife hooks (32a, 32b) without
developing any excessive swinging of the swing lever (34a, 34b). Each of the knife
hooks (32a, 32b) is actuated in such a manner that, when its corresponding end portion
of the swing lever (34a, 34b) assumes its most-advanced position relative to the vertical
lever (18), the knife hook (32a, 32b) provided at its corresponding end portion of
the swing lever (34a, 34b) assumes an eccentric position biased toward its corresponding
hook lever (28a, 28b).
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