Abstract: An expandable and contractible coiler mandrel for coiling metal strip, including: a rotatably supported coiler mandrel shaft with a wedge surface on its outer circumference; cooperating segments, which have an outer circumference with a coiling surface for the strip, and which have an opposing wedge surface cooperating with the wedge surface of the mandrel shaft in their end region facing away from the coiling surface; a mechanism for shifting the segments relative to an axial direction of the mandrel shaft; and a supply system for conveying lubricant to coiler mandrel regions that require lubrication. The supply system is connected with a lubricant pump having an actuating element for pumping, such that the pump is connected with the shifting mechanism or with the mandrel shaft, and the actuating element is connected with the other of the mandrel shaft or the shifting mechanism whereby pumping occurs only when the shifting mechanism is actuated.

Abstract: The invention concerns an expandable and contractible coiler mandrel (1), especially for coiling a metal strip, which has: a rotatably supported coiler mandrel shaft (2), which has at least one wedge surface (3) on its outer circumference; a number of cooperating segments (4), which have a coiling surface (5), especially for the metal strip, on their outer circumference, and which have at least one opposing wedge surface (7) that cooperates with the wedge surface (3) of the coiler mandrel shaft (2) in their end region (6) facing away from the coiling surface (5); means (8) for shifting the segments (4) relative to the axial direction (A) of the coiler mandrel shaft (2); and a supply system (9) with which a lubricant, especially lubricating grease, is conveyed to places (10) in the coiler mandrel (1) that require lubrication.