the circular surface 20 by way of the lateral feed cam surface 23 this causes the press roller 7 and the feed roller 8 to be pressed against photographic paper p it is thus fed photographic paper p is fed by the feed roller 8 by the length corresponding to the angle by which the cam plate 17 rotates until the engaging roller 16 is again brought into contact with the lateral feed cam surface 23 then the engaging roller 16 is moved laterally onto the cam surface 22 by way of the lateral feed cam surface 23 while the leading end of the photographic paper p is passing by the paper detection roller 30 as shown in fig5 the paper detection roller 30 will be pushed back at the same time the roller restrictor plates 26 27 will pivot downwards until they abut the inner end face of the engaging roller 16 as shown in fig1 a and 11b the engaging roller 16 is thus prevented from moving toward the circular surface 20 so that the press rollers 7 and 8 are kept separate from each other on the other hand while the leading end of the photographic paper p is not passing by the paper detection roller 30 the roller restrictor plates 26 27 are kept raised as shown in fig1 a and 12b thus the engaging roller 16 which has been moved onto the cam surface 22 by way of the lateral feed cam surface 23 will be pushed by the spring 19 and moved again onto the circular surface 20 by way of the guide surface 24 pressing the press rollers 7 and 8 against the photographic paper p again it is thus.