A booklet processing mechanism is described that includes a booklet guide and clamp system that is configured to act as the guide during entry and exit of the booklet into and from the mechanism, as well as clamp and hold the booklet in its proper position during a processing operation, for example by a laser or during vision verification. The booklet guide and clamp system is moveable between a first position for guiding an upper, free edge of an opened booklet and a second position where the upper, free edge is clamped against a backing plate. At the second, clamping position, the mechanism is out of the way so that it does not interfere with the processing operation. Because the guiding and clamping functions are combined into one mechanism, only one actuator and one sensor are needed for the guiding and clamping functions.