Sleeve-like printing or transfer form and device for chamfering the longitudinal ends of a sleeve-like printing or transfer form
View Patent ↗A support sleeve made of a metallic material, preferably of nickel, is provided at at least one longitudinal end with a chamfer running all around in the inner circumference. This prevents damage to a film-like coating or thin intermediate sleeve, which surrounds the cylinder core to which the sleeve is fitted. A device for chamfering and deburring the longitudinal ends of the sleeve include a supporting body having a cylindrical journal with a diameter only slightly smaller than the internal diameter of the sleeve to be machined, in order to accommodate a longitudinal end of the sleeve and to guide the cut. A cutting holder is machined on the supporting body by means of which holder a cutter can be brought up to the inner circumference of the longitudinal end of the sleeve to be machined, and the supporting body can be rotated relative to the sleeve to be machined and pushed onto the journal.
1. A sleeve-like form for mounting on one of a printing cylinder and a transfer cylinder, the one of a printing cylinder and a transfer cylinder including a cylinder core and one of a film coating or a thin intermediate sleeve surrounding the cylinder core for facilitating mounting of said form, said form comprising a support sleeve made of a rectangular metal sheet having opposite edges which are joined together at a welded seam, said support sleeve having an inner circumference, a pair of longitudinal ends, and a chamfer all round the inner circumference at at least one of said longitudinal ends, said support sleeve being designed to be expanded by compressed air as it is pushed over the one of a film coating or a thin intermediate sleeve surrounding the cylinder core, wherein edges of said chamfer are deburred and said chamfer is arranged and dimensioned such that damage to the one of a film coating or a thin intermediate sleeve by said chamfer and said edges of said chamfer when said support sleeve is pushed over the one of a film coating or a thin intermediate sleeve is prevented.
2. A sleeve-like form as in claim 1 wherein said support sleeve has a chamfer all around the inner circumference at both of said longitudinal ends.
3. A sleeve-like form as in claim 1 wherein said chamfer is a conical chamfer.
4. A sleeve-like form as in claim 1 wherein said support sleeve is made of nickel.
5. A sleeve-like form as in claim 1 further comprising a coating on said sleeve.
6. A sleeve-like form as in claim 1 wherein said chamfer is produced by turning with a cutting tool.