Rotary-tool mandrel, unit for converting a flat substrate, and operating method
AssigneeBobst Mex SA
InventorsPhilippe Clément, Pierre Robadey
Life of this patent
Estimating the term…
Abstract
A rotary-tool mandrel for a unit for converting a flat substrate, on which a sleeve (13) is intended to be fitted, the mandrel includes a cylindrical core (14), a peripheral wall (17) that is able to take up a rest position and a locking position by exerting a radial pressure on the sleeve (13) in order to lock it in position on the mandrel (12), a pressure fluid circuit (21) provided between the peripheral wall (17) and the cylindrical core (14) for exerting the radial pressure on the sleeve (13), and a cooling fluid circuit (24) for allowing a fluid to flow in the region of the cylindrical core (14) and for cooling the mandrel (12).
Claims15
A rotary-tool mandrel for a conversion unit for converting a flat substrate, the mandrel being configured to receive a sleeve thereon, the mandrel comprising:
- a cylindrical core;
- a front journal and a rear journal respectively on either end of the cylindrical core;
- a front bearing of the conversion unit holding the front journal;
- a rear bearing of the conversion unit holding the rear journal;
- the front journal and the rear journal forming a rotating shaft of the rotary-tool mandrel;
- a peripheral wall that is able to take up a rest position and a locking position by exerting a radial pressure on the sleeve in order to lock the sleeve in position on the mandrel;
- a pressure fluid circuit provided between the peripheral wall and the cylindrical core for exerting the radial pressure on the sleeve;
- and
- a cooling fluid circuit for allowing a fluid to flow in the region of the cylindrical core and for cooling the mandrel.
A method for operating a conversion unit for converting a flat substrate, the conversion unit comprising:
- at least one rotary-tool mandrel for a unit for converting a flat substrate, the mandrel being configured to receive a sleeve thereon;
- the mandrel comprising:
- a cylindrical core;
- a peripheral wall configured to take up a rest position and a locking position by exerting a radial pressure on the sleeve in order to lock the sleeve in position on the mandrel;
- a pressure fluid circuit provided between the peripheral wall and the cylindrical core for exerting the radial pressure on the sleeve;
- a cooling fluid circuit for allowing a fluid to flow in the region of the cylindrical core and for cooling the mandrel;
- and
- a front docking port for the cooling fluid circuit arranged at a front end of the mandrel, and a rear docking port for the pressure fluid circuit arranged at a rear end of the mandrel;
- the method comprising the steps of:
- connecting only one of the front and rear docking ports of the pressure fluid circuit to the cooling circuit;
- exerting a radial pressure on the sleeve with the peripheral wall by sending a fluid through the pressure circuit to lock the sleeve in position on the mandrel;
- and
- connecting the front and rear docking ports of the pressure circuit to the cooling circuit and causing a cooled fluid to flow through the pressure circuit in order to cool the mandrel.
Dependencies are inferred from the claim text.