Abstract: Automated processing of bank checks encoded with alphanumeric characters on the face of each check by transporting said checks as a serial constant velocity train through a processor to a sorter while at a first station generating an item control number unique to each document and at a second station sensing each character in the encoded line to produce a string of data signals for each document. At a third station the control number and other data is imprinted on the back of each document in code form and the control number and other data is imprinted on the face of each document in human readable form.