A punching transport apparatus attached to an end surface a cylindrical inner surface drum includes two transport units which are connected with a pulse motor, two belts, and two pulleys so as to be able to move in synchronism to each other. The two transport units are linked to two punching...http://www.google.com/patents/US5842397?utm_source=gb-gplus-sharePatent US5842397 - Punching apparatus and punching method for cylindrical inner surface scanner 
