Creasing device and corresponding method
AssigneePanotec S.R.L.
InventorGiuseppe Capoia
Life of this patent
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Abstract
A creasing device for a work unit of a machine for at least creasing and possibly cutting a sheet made of a relatively rigid material, such as corrugated cardboard for packaging, fed in a predetermined work direction, includes a first creasing member mounted rotatable with its first axis of rotation transverse to the work direction, and a pre-creasing system disposed upstream of the first creasing member in the work direction, and configured to carry out a pre-creasing which progressively deforms the material of the sheet to be worked before it is subjected to a creasing operation.
Claims10
A creasing device for a longitudinal work unit of a machine for creasing and cutting a sheet made of a relatively rigid material, such as corrugated cardboard for packaging, fed in a predetermined work direction, comprising:
- a first creasing member mounted to be rotatable with a first axis of rotation transverse to the predetermined work direction, and
- a pre-creasing device having a second pre-creasing member disposed upstream of the first creasing member in the work direction, and configured to carry out a pre-creasing which progressively deforms the material of the sheet to be worked before the sheet is subjected to a creasing operation,
- wherein the pre-creasing device defines a lead-in surface inclined toward the first creasing member with respect to the sheet, the lead-in surface progressively compressing the sheet toward the first creasing member,
- wherein the lead-in surface is shaped with a profile having a desired geometry,
- wherein the first creasing member and the second pre-creasing member are idle,
- wherein a transmission element is wound around the first creasing member and the second pre-creasing member and is rotatable around the first creasing member and the second pre-creasing member following contact with the advancing sheet,
- wherein a segment of the transmission element, situated between the first creasing member and the second pre-creasing member and facing the sheet, provides the lead-in surface,
- wherein an intermediate member made of relatively rigid material is positioned between the first creasing member and the second pre-creasing member and has a lower edge with a circular and downwardly bulged convex profile, and
- wherein the lower edge of the intermediate member has a groove for receiving and guiding a lead-in surface of the transmission element in order for the lead-in surface to have a circular shape which simulates and reproduces a segment of a creasing tool with a diameter larger than a diameter of the first creasing member for achieving the progressive linear compression of the material of the sheet.
Dependencies are inferred from the claim text.