Abstract: In apparatus for and a method of inserting a series of contents (1) into a series of containers (3), identifying magnetic indicia are printed on each one of the series of contents before insertion in the containers. After insertion and sealing of the containers the contents cannot be visually inspected without breaking the seals. The indicia are magnetically read by a reader (7) through the material of the sealed containers (3) and visible indicia corresponding to the identifying magnetic indicator retrieved from store (6), and applied to the exterior of the containers by a printer (5). The apparatus and method are applicable to automatic mailing systems where it is necessary to ensure that the correct addresses corresponding to a previously inserted series of letters in a series of respective envelopes are printed later on the exteriors of the envelopes. Instead of magnetically based systems, infra-red radio isotope or radio frequency identification based systems may also be used.

Abstract: A plurality of stepper motors, each of which comprises a stator assembly and a rotor, are axially aligned to form with a control system an encoder for use in a printing apparatus. The rotors constitute print wheels which support different print characters. The stator assembly of each motor only extends above a part of the circumference of the associated rotor. This enables the axial extent of the print wheels to be reduced, A sensor arrangement is provided to enable the home position of each wheel to be determined. In operation, the control system receives desired print character information and rotates the associated rotor to the correct position for printing to take place. Once all rotors have been rotated to their desired position for printing, printing can then take place. The arrangement enables the printing process to run faster than previously.