Mandrel for printing apparatus, a printing cylinder, a printing apparatus

A mandrel for use in a printing apparatus, the mandrel comprising:

• a substantially cylindrical mandrel shaft extending along a mandrel shaft axis;
• and
• a locking assembly, comprising:
• a stop ring;
• a locking ring;
• and
• a plurality of deformable rings slidably and coaxially mounted on the mandrel shaft,
• wherein the deformable rings are mounted between the stop ring and the locking ring,
• wherein the locking assembly has a locked position in which the locking ring is positioned closer to the stop ring than in an unlocked position,
• wherein in the locked position an outer diameter of the deformable rings is larger than in the unlocked position of the locking assembly,
• wherein each deformable ring has a cross-sectional profile in a cross-sectional plane in which the mandrel shaft axis extends,
• wherein the cross-sectional profile comprises a first arm and a second arm integrally connected to each other at a first connection point,
• wherein the first connection point is at a first diameter between an inner diameter and an outer diameter of the deformable ring,
• wherein, viewed perpendicular to the cross-sectional plane, the first arm and the second arms respectively extend in a first direction and a second direction, the first and second directions including an angle sharper in the unlocked position than in the locked position of the locking assembly,
• wherein the first arm has a first-arm-end remote from the first connection point, the first- arm-end defining the outer diameter of the deformable ring, and
• wherein the second arm has a second-arm-end remote from the first connection point, the second-arm-end defining the inner diameter of the deformable ring.