Abstract: A holder (10) for refilling an ink jet printhead (11) comprises a box (21) and two covers (22, 23), pivoted upwardly on the box (21) for being rotatable reciprocally and with respect to the box (21). A first cover (22) is provided for positioning and locking the printhead (11) into the box (21). A second cover (23) is superimposable to the first cover (22) and is provided with a seat (30) for being coupled with a refill cartridge (34) so as to refill the printhead (11). A short tube (31) is mounted in the second cover (23) inside the seat (30) to allow ink to pass from the cartridge (34) to the printhead (11) for refilling the latter. Pivoting of the two covers (22 and 23) allows simple and exact positioning of the same covers with respect to the printhead (11), first to lock it into the box (21) and then to fill the printhead (11) with ink.

Abstract: This invention relates to a cartridge 11 for a printing ribbon 13 comprising a container 12 which houses an inked ribbon 12, a ribbon feeding roller 18 and a ribbon inking element 14. The inking element 14 is selectively actuated from a rest condition in which, during the cartridge utilization initial phase, the inking element does not supply the ribbon 13 with ink, to a work condition in which the inking element 14 supplies the ribbon with ink. A reducing unit 34 and a cam 33,42 are provided for automatically actuating the inking element 14 and guide it from the rest to the work condition, when a predetermined number of turns is reached by the feeding roller 18 for advancing the ribbon.

Abstract: A protective screen for a visual display unit (VDU) comprises a filter layer which is operative to protect the operator from electrostatic and electromagnetic fields and from residual radiation of a cathode ray tube (CRT) of the VDU. The VDU comprises a body structure for the CRT and the screen comprises a support frame for the filter layer, an intermediate support between the frame and the body structure of the VDU and a pair of fixing plates which are adjustable both front to back and angularly, for fixing the intermediate support to the upper portion of the body structure independently of the specific form of the body structure. The frame of the screen is also pivoted to the intermediate support to permit the filter layer to be disposed in front of the display surface of the CRT or be swung up to expose the CRT screen.