(57) An apparatus for tying a knot on one or more cords comprises a knotting channel that
is continuous in an active mode of the apparatus, the cord or cords being transported
through said channel by an air drive so as to form a loose knot. The apparatus comprises
two rigid end parts (19, 22), each comprising a slotted portion of the knotting channel
and a connection (20) for the air drive, and furthermore a rigid intermediate part
(26) that, in the active mode, closes off said slotted portions between the end parts
so as to form portions of the knotting channel, making the knotting channel continuous
by means of a recess in the intermediate part. A mechanism is further provided for
moving the respective parts away from one another into an inactive mode, such that
the slotted portions become exposed and the loose knot can be tightened by a force
applied to the cord or cords. In particular, the end parts are arranged in an axial direction, and the intermediate
part (26) extends in forward direction between said end parts (19, 22) transversely
to said axial direction up to an end line in the active mode, said end parts substantially
merging into one another at the location of said end line. Furthermore, the intermediate
part widens from the end line transversely to the axial direction, and the inactive
mode is achieved through a substantially non-rotational movement of at least two of
said parts of the apparatus from the active mode in a direction away from said end
line.
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