bearing recess 34 of the rod bed 3 the socket 28 of the holder 2 basically has a c shape which as shown in fig1 is composed of an upper holder part 21 a lower holder part 22 and a rear holder part 23 which are disposed basically perpendicular to each other the rear holder part 23 is further provided with a supporting arm 24 at whose rear free end a pressing section 25 which is arranged basically perpendicular to the supporting arm 24 is provided and abuts on an adjusting hose 8 in the operation of the rod bed assembly 1 the adjusting hose 8 is fastened to a machine frame part 9 on which also the holder 2 can be fastened and serves to adjust the position of the doctor rod 4 with respect to the paper or cardboard web to be coated the front end of the upper holder part 21 is provided with a projection 211 which extends to the inner side of the socket 28 similarly the lower holder part 22 is provided with a projection 221 which extends to the inner side of the socket 28 the holder is further provided with a recess 26 in which in the operation of the rod bed assembly 1 a seal not shown is inserted for preventing a leakage of the.