Apparatus for processing a fabric in a tumbler

An apparatus for processing a fabric by repeated brushing on the fabric, the apparatus comprising a tumbler for processing the fabric, provided with a feed duct for feeding the fabric in open-width form continuously between an infeed port and an outfeed port of the duct;

• an adjustment device for adjusting a passage section of the duct and associated with the duct at least at one of the ports;
• the adjustment device causing the passage section to be narrowed in such a way that the fabric, which reaches the port in open-width form and is made to pass through the port in a first feed direction, is bunched into rope form and then allows the fabric, when the fabric is made to pass in an opposite direction through the narrowed passage section, where the narrowed passage section is subtended by the other, wide port of the duct, to be stretched out from the rope form to the open-width form again.