Patent ID: 7722025

Claim:
Apparatus for processing a sheet, comprising: a vertical guide for inserting said sheet; a stop member to stop said sheet in a hold position along said vertical guide, said stop member being suitable for contact cooperation with a lower edge of said sheet; a presence sensor to detect the presence of said sheet in said hold position, said presence sensor being also suitable to detect the alignment of said sheet in said hold position with respect to a predetermined reference line; a transfer device that can be selectively engaged with said sheet; and a processing member suitable to perform an operation on said sheet, characterised in that: said processing member is placed at a processing position of said sheet spatially separated from said hold position; said stop member can be switched from a stop position of said lower edge to a release position of said lower edge; and said transfer device is provided to transfer said sheet from said hold position to said processing position, and in that said processing apparatus further comprises: a control and command device associated with said stop member and with said transfer device, suitable to command switching of said stop member from said stop position to said engagement position, and the action of said transfer device, in response to the detection of the presence and alignment of said sheet in said hold position by said presence sensor; wherein said presence sensor comprises two distinct sensitive elements, longitudinally spaced and arranged along said predetermined reference line to detect the alignment of the lower edge of said sheet in contact with said stop member.