up weft on weaving machines employs a rotary stripping brush with agitation hairs and also tangentially oriented feed jets situated on an exterior periphery of the brush application_number US 40099089 A description referring to fig1 the present device consists of a body 1 of a rotary stripping brush 2 fitted with agitation hairs 3 and with feed jets 4 preferably the exterior of the body 1 is cylindrical preferably the hairs 3 extend generally radially outwardly with respect to the cylindrical exterior periphery of the body 1 the rotary stripping brush 2 is situated under the lower strand of a shed 5 in whose grip is situated a weft 6 to be unravelled the shed 5 is followed by a woven fabric 7 supported by a bar 8 on the opposite side warp threads constituting the shed 5 pass through a reed 9 on which is located an auxiliary jet 10 the first stage of the unravelling cycle consists in stopping the machine in response to a signal from a stop motion sensor not shown and in loosening i e releasing the inserted beat up and separated weft 6 by the reverse motion of non illustrated heald shafts then the stripping brush 2 is displaced to its operative position shown in fig1 i.