Abstract: A silk-screen printing machine in simplified register comprising a bearer structure (12) on which a silk-screen printing frame is arranged, elements in register (18) of the position of a sheet element to be printed (15) in a supply plane (14), means (34) for detecting the position of the sheet in register (15) and at least one pincer-carrying rod (16) suitable for pulling the sheet (15) on a printing plane (13), is equipped with a group for registering the sheet (15), which is arranged upstream of the pincer-carrying rod (16) and comprises a transversal plate (17) for supporting the sheet and able to translate towards the pincer-carrying rod (16), a plurality of the mobile elements in register (18) suitable for interacting downstream of the plate (17) with the supply plane (14) of the sheet and a plurality of presser elements (19) arranged in a position above the support plate (17) and mobile towards it to engage the sheet (15).

Abstract: A gripper device for transporting and registering sheets of any type under the printing heads of silk screening and the like printing machines, which comprises a box-like supporting body having hingedly connected thereto, against the bias of preloaded spring members, a plate-like element forming a flat jaw, and juxtaposed thereto, a plurality of flat surface gripper elements which are set in mutual alignment and for oscillation about a parallel axis to said juxtaposed jaw and adapted to be brought close against said juxtaposed jaw by means of at least one slide element which is driven reciprocatingly by a drive shaft from the silk screen printer, said slide element being provided with an actuating means cooperating with means associated with said flat jaw and with said plurality of juxtaposed gripper elements and adapted to produce, as said slide is being reciprocated, a rotation of said plurality of gripper elements about their own axes toward said opposed flat jaw and to allow said flat jaw to be disengaged