Feeding device for strips

Strips feeding device comprising a pair of longitudinal sliding guides (1), means for feeding of the strip in steps parallel to said sliding guides (1) including a stationary gripper (3) and a movable gripper (4) each comprising a fixed jaw (3a, 4a) and a movable jaw (3b, 4b) arranged transversally and on opposite sides of the strip and a pneumatic actuator group (2) for commanding the linear alternating movement forward and backward of the movable gripper (4) with respect to the stationary gripper (3) along said longitudinal guides (1) and the opening and closing movements of the movable jaws (3b, 4b) of said grippers (3, 4) with respect to the respective fixed jaws (3a, 4a) in sync with the alternating movement of the movable gripper (4), and an adjustable abutment member (8) interacting with the movable gripper (4) at the end of its forward movement in order to determine the strip feeding step, wherein said abutment member (8) comprises a crosspiece provided with a pair of end blocks (13) to be engaged, by way of removable positive couplings, with corresponding reference seats (19) of said sliding guides (1), and said reference seats are made from substantially hemispherical recesses (19) and said end blocks (13) of the stop crosspiece (8) are provided with substantially hemispherical protrusions (18) for engaging in said recesses (19).