funnel 10 take off rollers 11 12 revolving flat 13 with flat guide rollers 13 a 13 b and flat bars 14 can 15 and can coiler 16 the directions of rotation of the rollers are shown by respective curved arrows the letter m denotes the midpoint axis of the cylinder 4 the reference numeral 4 a denotes the clothing and reference numeral 4 b denotes the direction of rotation of the cylinder 4 the letter b denotes the direction of rotation of the revolving flat 13 in the carding position and the letter c denotes the reverse transport direction of the flat bars 14 stationary cover and work elements e g stationary carding elements 17 i are arranged between the licker in 3 c and the rear flat guide roller 13 a and stationary cover and work elements e g stationary carding elements 17 ii are arranged between the front licker in 3 a and the doffer 5 the letter a denotes the work direction the curved arrows drawn in the rollers denote the direction of rotation of the rollers the numeral 2 denotes a heating device according to the invention in the illustrative embodiment shown in fig2 on each side of the card an approximately semi circular rigid side panel 18 a 18 b see fig3 is secured laterally to the machine frame not shown mounted e g by screws on the outside of the side panel concentrically in the region of the periphery thereof there is a curved bearing element 19 a 19 b extension bend u2014 see fig3 u2014 which has a convex outer surface 19 i as its bearing surface and an underside 19 ii at both.