Register mark detection apparatus utilizing a first and second linear array of sensors arranged non-parallel allowing longitudinal and transverse monitoring
First Claim
1. Register mark detection apparatus for detecting register marks on a web during relative movement between said web and said apparatus, said apparatus comprising:
- detection means including a first linear array of sensors extending transverse to said direction of relative movement, each said sensor of said first array generating a signal when a mark is detected, and a second linear array of sensors (20) extending transverse to said direction of relative movement and substantially non-parallel with said first array, each said sensor of said second array generating a signal when a mark is detected; and
processing means for monitoring said signals from said sensors so as to determine which sensor or group of sensors has sensed the passage of a mark.
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Accused Products
Abstract
Apparatus for detecting register marks includes one or more linear arrays of sensors (19, 20) arranged transverse to the direction of relative movement of a web (3) and the apparatus. Where there is more than one linear array (19, 20), they are arranged so that they are substantially non-parallel to allow both longitudinal and transverse monitoring of register marks on the web (3). A signal is generated on detection of a mark and processing means determine the sensor (19) or group of sensors which detected a mark and whether the marks are in register with those of other webs (3).
18 Citations
16 Claims
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1. Register mark detection apparatus for detecting register marks on a web during relative movement between said web and said apparatus, said apparatus comprising:
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detection means including a first linear array of sensors extending transverse to said direction of relative movement, each said sensor of said first array generating a signal when a mark is detected, and a second linear array of sensors (20) extending transverse to said direction of relative movement and substantially non-parallel with said first array, each said sensor of said second array generating a signal when a mark is detected; and processing means for monitoring said signals from said sensors so as to determine which sensor or group of sensors has sensed the passage of a mark. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Register mark monitoring apparatus for monitoring the longitudinal registration of marks on a web during relative movement between said web and said apparatus, said apparatus comprising:
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detection means including a first linear array of sensors extending transverse to the direction of relative movement, each said sensor of said first array generating a signal when a mark is detected, and a second linear array of sensors (20) extending transverse to said direction of relative movement and substantially non-parallel with said first array, each said sensor of said second array generating a signal when a mark is detected; and processing means for monitoring said signals from said sensors so as to monitor the relative positions of said marks on said web and to determine whether or not marks are in register. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification