Apparatus and method for changing a blade of a rotary die cutter, particularly for flexographic printing machines
AssigneeBobst Firenze S.R.L.
InventorsUgo Bagnoli, Federico D'Annunzio, Giacomo MacCalli, Mauro MacCalli
Life of this patent
Estimating the term…
Abstract
Apparatus (1) for changing a blade of a rotary die cutter, particularly for flexographic printing machines: a magnetic cylinder (3) configured to receive and support a die-cutting blade (5, 5′); a station (7) for inserting the blade (5, 5′) has a retention device (70) configured to retain the blade (5) in the insertion station; a guiding device (71) guides the blade (5, 5′) toward the magnetic cylinder (3); a station (9) for extracting the blade (5, 5′), has an extraction device (90) configured to remove the blade (5, 5′) from the magnetic cylinder (3).
Claims12
An apparatus for changing a blade of a rotary die cutter, comprising:
- a magnetic cylinder configured to receive and support a blade wrapped around the magnetic cylinder, wherein the blade is magnetically attracted to the cylinder;
- the cylinder being rotatable in a rotation direction;
- an insertion station configured for inserting the blade, the insertion station being at a first location around the cylinder;
- the insertion station comprising a blade retention device configured to retain the blade in the insertion station, and a guiding device configured to guide the blade out of the insertion station and toward the magnetic cylinder where the blade is wrapped around the cylinder;
- an extraction station configured for extracting the blade from the cylinder, the extraction station being at a second location around the cylinder, downstream in the rotation direction and spaced from the first location;
- the extraction station comprising an extraction device configured to remove the blade from the magnetic cylinder, the extraction device comprising an oscillating body which includes an end configured to detach the blade from the magnetic cylinder, the oscillating body being configured to oscillate between an inactive configuration, in which an end of the oscillating body is spaced from the magnetic cylinder, and a removal configuration for removing the blade from the cylinder, in which the end of the oscillating body is configured to engage the blade and to detach the blade from the magnetic cylinder.
A method for changing a blade of a rotary die cutter, comprising the steps of:
- a. providing apparatus for changing a blade of a rotary die cutter, the apparatus comprising a magnetic cylinder configured to receive and support a blade, an insertion station configured for insertion of the blade onto the magnetic cylinder and an extraction station configured for extracting the blade from the magnetic cylinder;
- b. rotating the magnetic cylinder about its own rotation axis in a rotation direction;
- c. the extraction station being spaced downstream from the insertion station in the rotation direction;
- in the extraction station, detaching and removing a first blade from the magnetic cylinder by an extraction device that cooperates with the rotating magnetic cylinder and with the first blade around the cylinder;
- d. inserting a second blade in the insertion station;
- e. guiding the second blade from the insertion station toward the magnetic cylinder;
- and
- f. wrapping the second blade around the magnetic cylinder by the rotation of the magnetic cylinder about its own rotation axis;
- the step of detaching and removing the first blade from the magnetic cylinder comprises engaging the first blade and detaching the first blade from the magnetic cylinder by an extraction device at the extraction station and the extraction device is configured to remove the first blade from the magnetic cylinder, by penetrating between the first blade and the magnetic cylinder.
Dependencies are inferred from the claim text.