Method and apparatus for correcting a feeding distance of a strip for cutting
AssigneeVmi Holland B.V.
InventorHans De Boer
Life of this patent
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Abstract
A method and an apparatus for correcting a feeding distance of a strip or cutting, involves feeding the strip over the feeding distance in a feeding direction towards a cutting line that extends at an oblique cutting angle to the feeding direction; detecting a lateral position of a first longitudinal edge of the strip in a lateral direction perpendicular to the feeding direction; wherein, when the detected lateral position is offset over an offset distance in the lateral direction with respect to a reference position for the first longitudinal edge at the measuring line, and adjusting the feeding distance with a correction distance that is related to the offset distance in a ratio that is defined by the cutting angle.
Claims23
A method for correcting a feeding distance of a strip for cutting, wherein the strip has a strip body extending in a longitudinal direction, a first longitudinal edge extending at first side of the strip body and a second longitudinal edge extending at a second side of the strip body opposite to the first side, wherein the method comprises the steps of:
- feeding the strip over the feeding distance in a feeding direction towards a cutting line that extends at an oblique cutting angle to said feeding direction;
- detecting a lateral position of the first longitudinal edge along a measuring line;
- wherein, when the detected lateral position is offset over an offset distance in a lateral direction perpendicular to the feeding direction with respect to a reference position for the first longitudinal edge at the measuring line, the method further comprises the step of:
- adjusting the feeding distance with a correction distance that is related to the offset distance in a ratio that is defined by the cutting angle.
An apparatus for correcting a feeding distance of a strip for cutting, wherein the strip has a strip body extending in a longitudinal direction, a first longitudinal edge extending at first side of the strip body and a second longitudinal edge extending at a second side of the strip body opposite to the first side, wherein the apparatus comprises:
- a cutter for cutting the strip along a cutting line;
- a conveyor for feeding the strip over the feeding distance in a feeding direction towards the cutting line, wherein the cutting line extends at an oblique cutting angle to said feeding direction;
- a drive for controlling the conveyor;
- a sensor device for detecting a lateral position of the first longitudinal edge along a measuring line;
- and
- a control unit that is operationally connected to the sensor device and the drive, wherein the control unit is configured for:
- adjusting the feeding distance when the detected lateral position is offset over an offset distance in a lateral direction perpendicular to the feeding direction with respect to a reference position for the first longitudinal edge at the measuring line, wherein the feeding distance is adjusted with a correction distance that is related to the offset distance in a ratio that is defined by the cutting angle.
Dependencies are inferred from the claim text.