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US 11,027,538 B2Granted
Register error detection device, register error detection method, and printed matter
AssigneeTaiyo Electric Industry Co., Ltd.
InventorKatsuhiko Fujimaki
Life of this patent
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Abstract
In a register error detection device, an image capturing unit captures an image of two first register marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press and a second register mark of a second color printed on the substrate by a second plate cylinder of the rotary printing press. A calculation unit calculates a register error based on the number of pixels between a reference position located between the two first register marks and a comparison position that is based on the second register mark in the image captured by the image capturing unit.
Claims10
A register error detection device comprising:
- an image capturing unit that captures an image of two first register marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press and a second register mark of a second color printed on the substrate by a second plate cylinder of the rotary printing press;
- and
- a calculation unit that compares a reference position located between the two first register marks with a comparison position that is based on the second register mark in the image captured by the image capturing unit,
- wherein the calculation unit calculates a register error based on the number of pixels between the reference position and the comparison position, and
- wherein the calculation unit calculates the distance per pixel based on the number of pixels between the respective centroids of the two first register marks in the image and a known distance between the respective centroids of the two first register marks that have been printed, and calculates the product of the distance per pixel and the number of pixels between the reference position and the comparison position as the register error.
2 more elements
A register error detection method comprising:
- capturing an image of two first register marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press and a second register mark of a second color printed on the substrate by a second plate cylinder of the rotary printing press;
- and
- comparing a reference position located between the two first register marks with a comparison position that is based on the second register mark in the image that has been captured,
- wherein in the comparing, calculating a register error based on the number of pixels between the reference position and the comparison position, and
- wherein in the comparing, calculating the distance per pixel based on the number of pixels between the respective centroids of the two first register marks in the image and a known distance between the respective centroids of the two first register marks that have been printed, and calculating the product of the distance per pixel and the number of pixels between the reference position and the comparison position as the register error.
2 more elements
A register error detection device comprising:
- an image capturing unit that captures an image of two first register marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press and a second register mark of a second color printed on the substrate by a second plate cylinder of the rotary printing press;
- and
- a calculation unit that compares a reference position located between the two first register marks with a comparison position that is based on the second register mark in the image captured by the image capturing unit,
- wherein the image capturing unit further captures an image of an additional second register mark of the second color printed on the substrate by the second plate cylinder,
- wherein a first line segment connecting the two first register marks intersects with a second line segment connecting the second register mark and the additional second register mark,
- wherein the calculation unit uses the centroid of the second register mark and the additional second register mark as the comparison position, and
- wherein the calculation unit prohibits control over printing misalignment in the rotary printing press when an angle formed by the first line segment and the second line segment in the image is outside a predetermined angle range.
4 more elements
Dependencies are inferred from the claim text.