Technische Eingriffe in marine Lebensrume

A developing unit comprising a developing chamber having an upper film pass roller and a lower film pass roller, a gasifying chamber, and a heating chamber, discharging outlets connecting from the heating chamber to the developing chamber at upper and lower portions of the upper film pass roller, and sucking inlets connecting from the developing chamber to the gasifying chamber at upper and lower portions of the lower film pass roller, so that the surface area of each sucking inlet is made substantially equal to that of each discharging outlet. This improves convection efficiency of the hot blast and thus temperature differences between the upper and lower portions within the developing chamber thereby preventing tone variations of the copied images.