Method of creasing sheets
AssigneeBobst Mex SA
InventorRoberto Valterio
Life of this patent
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Abstract
The invention relates to a method of creasing sheets (12) by using a creasing tool (14, 20, 21) cooperating with a counter element (22, 23), comprising the following steps: a creasing plate blank (24′) is provided with at least one creasing projection (26) by plastically deforming the material of the blank (24′) so as to form a creasing plate (24), the creasing plate (24) is mounted to a creasing tool (14, 20, 21), sheets (12) to be provided with at least one crease are advanced through a gap between the creasing tool (14, 20, 21) and the counter element (22, 23).
Claims18
A method of creasing sheets by using a creasing tool cooperating with a counter element, the method comprising:
- providing a creasing plate blank with at least one creasing projection by plastically deforming a material of the creasing plate blank with a projecting portion of a punch to form a creasing plate, wherein the projecting portion has opposite ends having different radii, wherein the material of the creasing plate blank is deformed by means of a punching module, and wherein the punching module has the punch and a die, the die having an outer contour which extends, adjacent to an open end of a recess, at an angle of between 90° and 45°, 45° or less than 45° with respect to a longitudinal direction of the recess, the die being rotated so as to align the outer contour with another creasing projection other than the at least one creasing projection,
- mounting the creasing plate to a creasing tool, and
- advancing sheets to be provided with at least one crease through a gap between the creasing tool and the counter element.
A method comprising:
- forming a first crease in a sheet using a creasing plate with at least one creasing projection formed by a projecting portion of a punch, wherein the projecting portion has a small radius of curvature at a first end of the projecting portion and a large radius of curvature, relative to the small radius of curvature at the first end of the projecting portion, at a second end of the projecting portion, wherein the at least one creasing projection is formed by means of a punching module, and wherein the punching module has the punch and a die, the die having an outer contour which extends, adjacent to an open end of a recess, at an angle of between 90° and 45°, 45° or less than 45° with respect to a longitudinal direction of the recess, the die being rotated so as to align the outer contour with another creasing projection other than the at least one creasing projection, and
- forming a second crease in the sheet using the creasing plate,
- wherein an end of the first crease is adjacent to an end of the second crease.
A method comprising:
- forming a first crease in a non-corrugated sheet using a creasing plate mounted in a first cylinder and a counter element mounted in a second cylinder, wherein the creasing plate has at least one creasing projection formed by a projecting portion of a punch, wherein the at least one creasing projection is formed by means of a punching module, wherein the projecting portion has a small radius of curvature at a first end of the projecting portion and a large radius of curvature, relative to the small radius of curvature at the first end of the projecting portion, at a second end of the projecting portion and wherein the punching module has the punch and a die, the die having an outer contour which extends, adjacent to an open end of a recess, at an angle of between 90° and 45°, 45° or less than 45° with respect to a longitudinal direction of the recess, the die being rotated so as to align the outer contour with another creasing projection other than the at least one creasing projection, and
- forming a second crease in a corrugated sheet using the creasing plate mounted in the second cylinder and the counter element mounted in the first cylinder.
Dependencies are inferred from the claim text.