Device located between a job a loom and a machine for forming the shed, in particular to the invention, comprising an auxiliary motor as well as a coupling a single tooth 16, 17 by a spring 39, a claw 17 of the coupling is located on a wheel toothed 21, the front face has a control cam 29 being provided with hollows and bosses 28 with which may be induced in contact with the rollers 34, which can move axially with respect to the shaft 6, according to the dimensions and the location of these rollers the drive motor of the search device of the shed the bring in a position corresponding to the nozzle or a reduced, and simultaneously the return spring 39 is compressed, thereby avoid of the forces to the operator.
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