(57) An air jet loom (10, 110) includes a weft insertion nozzle (18, 118) for inserting
a weft thread (14, 114) through a shed by means of an airflow; a first supply channel
(28, 128) for supplying the weft insertion nozzle with first compressed air for weft
insertion; and a second supply channel (30, 130) for supplying the weft insertion
nozzle with second compressed air used for threading the weft thread through the weft
insertion nozzle and having a pressure different from that of the first compressed
air. The second supply channel has an on-off valve (44, 144) for opening and closing
the second supply channel. The on-off valve is opened in response to a control signal
(S4) from a manual operating device (64). The manual operating device includes an
operating switch (66) for outputting the control signal and a setting unit (70) for
adjustably setting a time period in which the on-off valve is opened. When the operating
switch is operated, the control signal is output to the on-off valve for the time
period set by the setting unit.
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