Cylinder, device and machine for aligning magnetic or magnetizable particles on a web-like or sheet-like substrate

A cylinder for aligning one of magnetic and magnetizable particles contained in a coating medium that is applied to a first side of one of a web-format and a sheet-format substrate, which cylinder has, in a region of its outer circumference, a plurality of magnetic elements;

• wherein the plurality of magnetic elements are arranged one of in and on a plurality of ring elements, which plurality of ring elements are spaced apart from one another axially and are adjustably positionable in an axial direction on a shaft of the cylinder;
• wherein one of in and on each of the plurality of ring elements a ones of the plurality of magnetic elements are arranged one after another in a circumferential direction of each one of the plurality of ring elements;
• wherein at least two adjacent ones of the plurality of ring elements each have a cover element that forms a part of a cylindrical shell surface of the cylinder and that extends in the circumferential direction, at least over a circumferential region of each of the at least two adjacent ones of the plurality of ring elements that are equipped with the plurality of magnetic elements;
• and
• wherein cover elements of first and second adjacent ones of the plurality of ring elements, on sides of the cover elements that face one another in the axial direction, each have a plurality of protrusions alternating in the circumferential direction with a plurality of recesses, which recesses and protrusions on the first one of the first and second adjacent ring elements are offset in the circumferential direction of the cylinder from corresponding recesses and protrusions on the second one of the first and second adjacent ring elements whereby, with a relative movement of the first and second ring elements toward one another, the protrusions on the cover element of the first adjacent ring element extend, in a tooth-like manner, into corresponding recesses of the second adjacent ring element and overlap one another, as viewed in the circumferential direction.