protective ring for printing sleeves to graft quickly removable

摘要

A protection ring (1) for a printing sleeve (3) such as a sleeve or cylinder carrying the characters to be printed, or an adapter sleeve for supporting said sleeve or cylinder, said sleeve to be mounted on a rotary mandrel provided with a register pin, the ring comprising an annular body (2) to be disposed on an end edge (7) of the sleeve (3), said body (2) comprising guide means (20) for its coupling to said sleeve (3), this latter being provided with guide counter-means (22) for cooperating with said means (20), and a register seat or recess (14) for cooperating with said sleeve register pin, means (26) being provided for centering the ring on the sleeve (3), to enable said ring (1) to be disposed on the sleeve such that the register recess (14) lies in a suitable position for cooperation with said register pin. The guide means are at least one tooth or projection (20), the counter means being a seat in the sleeve (3), the body (2) being inserted into a seat (6) in the sleeve end edge (7) and being fitted in the latter without any mechanical fixing member or glue.