(57) A jacquard pattern control mechanism for a circular knitting machine (20) comprises
a plurality of rocker bar supporting members (40) slidable in the grooves (26) along
which knitting elements (27) move. Elongate rocker bars (44) are pivotally mounted
on the rocker bar supporting members for movement about medial pivots, the opposite
end portions (44b,44c) of the rocker bars being selectively movable between operative
and inoperative positions and having magnetically attractable sections (44f,44g) thereon.
Magnet attracting devices (50) are operatively associated with the opposite end portions
of the elongate rocker bars for selectively attracting the magnetically attractable
sections at opposite ends of the rocker bars to pivot the rocker bars and selectively
move the opposite end portions thereof to the operative and inoperative positions.
The magnetic attracting devices each comprises a permanent magnet and a pair of electromagnets
(51,52) disposed on opposite sides of the permanent magnet and connected in series,
the permanent magnet having an extension extending outwardly towards the rocker bars
(44) and having a pair of wing portions extending outwardly from the center portion
of the extension, generally parallel to the rocker bar supporting members (40) and
having outer sections disposed in attractable relation to the magnetically attractable
sections (44f,44g) at opposite ends of the rocker bars. The wing portions of the permanent
magnet cooperate with the core parts of the electromagnets (51,52) in providing stronger
magnetic fields for attraction of the magnetically attractable sections of the rocker
bars.
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