Patent ID: 6565078
Filing Date: 2003-05-20
Classification: B65H

Abstract:
Device (10) for the feeding of sheets (23) from a ream (22), comprising:a main feeding roller (24) provided for rotating in contact with an uppermost sheet (23a) of said ream (22) in order to feed it and impart to it a predetermined feeding direction along a path (30), and at least one auxiliary separating roller (26) arranged adjacently to said main feeding roller (24) and also provided for rotating in contact with said uppermost sheet (23a), said auxiliary separating roller (26) being provided for cooperating with said main feeding roller (24) in order to correctly separate said uppermost sheet (23a) from the other sheets (23) of the ream (22), wherein said main feeding roller (24) and said auxiliary separating roller (26) are arranged on the same side with respect to said uppermost sheet (23a), so that said rollers (24, 26) cooperate in contact with a same face of said uppermost sheet (23a), and said auxiliary separating roller (26) is accommodated, at least partly, inside the work envelope radially of said main feeding roller (24), characterised in that said main feeding roller (24) is adapted for rotating, during a feeding cycle of said uppermost sheet (23a), in two directions of rotation, respectively a first direction of rotation and a second direction of rotation opposite to said first direction of rotation, said second direction of rotation corresponding to said predetermined feeding direction (40) of said uppermost sheet (23a) along said path (30), whereby, during a first starting step of said cycle, said main feeding roller (24) rotates according to said first direction of rotation, while simultaneously said auxiliary separating roller (26), by rotating in contact with said uppermost sheet (23a), positively commands feeding thereof in such a way as to bring it into engagement with said main feeding roller (24), and whereby subsequently, during a second step of said cycle, said main feeding roller (24) inverts its direction of rotation in order to rotate according to said second direction of rotation and impart said predetermined feeding direction (40) to said uppermost sheet (23a) along said path (30), while at the same time said auxiliary separating roller (26) ceases to command the feeding of said uppermost sheet (23a).