Processing station for an electrophotographic information printer

Claim 1

An electrophotographic information printer utilizing a zerographic system comprising a sheet supply with associated sheet feeding means for feeding individual sheets to a sheet advancing path; a movable photoconductor with an associated image transfer device arranged at said sheet advancing path for transferring a toner image developed on said photoconductor to a sheet advanced along said sheet advancing path; a further sheet advancing device for conveying sheets from said image transfer device to a fixation device; said sheet supply device with associated sheet feeding means, said photoconductor and said further sheet advancing device forming individual replaceable first, second and third sheet processing modules, respectively; at least two of said first, second and third modules each including a rotatable member and an individual drive means in the form of an electronic stepping motor which is mechanically coupled to the respective rotatable member within said module; a program-controlled control unit; and a device operated by the program-controlled control unit for selectively supplying predetermined numbers of pulses at controlled pulse frequencies to the respective stepping motors within said at least two modules for operating said stepping motors in an operational sequence for said information printer.