A storing and issuing module comprising: a first storage roller configured to store a first group of flexible documents and a second storage roller configured to store a second group of flexible documents, each storage roller (50a, 50b) having a sensor (67a, 67b) configured to monitor an instant storage capacity of the respective storage roller (50a, 50b) wherein said instant storage capacity is correlated to an instant diameter D of the respective storage roller (50a, 50b); a common space within the storing and issuing module shared by and interposed between the first and second storage rollers (50a, 50b); a first transport-tape configured to wrap alternatively around the first storage roller and a first feeding-roller to move one or more flexible documents between a first entry-exit path and the first storage roller to either store said one or more flexible documents around the first storage roller or issue said one or more flexible documents from the first storage roller, characterised by the first transport-tape being configured to move along a first tape forward path between the first feeding-roller and the first entry-exit path that is located in the common space, a pair of first accompanying rollers configured to be pushed by the first transport-tape along said first tape forward path against an external surface of the first storage roller, wherein both first accompanying rollers have axes each configured to follow a respective first trajectory to maintain a first anti-friction gap G between said first tape forward path and said external surface of the first storage roller, and an electronic unit configured to control the first and second storage rollers (50a, 50b) on the basis of the instant storage capacity of each storage roller (50a, 50b) to maintain a distance between said first tape forward path and the second storage roller greater than or equal to a second anti-friction gap. a first storage roller configured to store a first group of flexible documents and a second storage roller configured to store a second group of flexible documents, each storage roller (50a, 50b) having a sensor (67a, 67b) configured to monitor an instant storage capacity of the respective storage roller (50a, 50b) wherein said instant storage capacity is correlated to an instant diameter D of the respective storage roller (50a, 50b); a common space within the storing and issuing module shared by and interposed between the first and second storage rollers (50a, 50b); a first transport-tape configured to wrap alternatively around the first storage roller and a first feeding-roller to move one or more flexible documents between a first entry-exit path and the first storage roller to either store said one or more flexible documents around the first storage roller or issue said one or more flexible documents from the first storage roller, characterised by the first transport-tape being configured to move along a first tape forward path between the first feeding-roller and the first entry-exit path that is located in the common space, a pair of first accompanying rollers configured to be pushed by the first transport-tape along said first tape forward path against an external surface of the first storage roller, wherein both first accompanying rollers have axes each configured to follow a respective first trajectory to maintain a first anti-friction gap G between said first tape forward path and said external surface of the first storage roller, and an electronic unit configured to control the first and second storage rollers (50a, 50b) on the basis of the instant storage capacity of each storage roller (50a, 50b) to maintain a distance between said first tape forward path and the second storage roller greater than or equal to a second anti-friction gap.