Abstract: A photosensitive material feed mechanism for the exposure station of an auto-printer in which a forward end of a lith plate is formed with a guide structure without a need for an increased number of parts in a manner that a photosensitive material may be smoothly fed into the exposure station with a forward end of photosensitive material being guided by the above-mentioned guide structure when the mechanism is initially loaded with photosensitive material. A greeting card kit serving as the exposure station of the auto-printer includes a basic frame, upper and lower guide plates fixed to the basic frame, and a douser exposed externally of the greeting card kit. The lith plate is formed with a character zone exposure window and a picture zone exposure window in addition to the previously mentioned guide structure and is capable of being withdrawably inserted into the greeting card kit through the externally exposed douser.