EP0240950A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Web registration control system
Assignee: Quad Tech Inc
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Filing: 1987-04-03
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Granted: —
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Expires: 2007-04-03
Abstract
Abstract A system for maintaining registry between a plurality of printing units (102-105), cooperating with a moving web (110), the system being of the type wherein the printing units (102-105) include means (116, 117, 118, 119) for placing respective registration marks (202, 203, 204, 205, 206) on the web (110), the relative positions of the marks (202, 203, 204, 205, 206) being indicative of registry between the printing units (102-105), and further including means (126) responsive to control signals applied thereto for adjusting the registry of the printing units (102-105), and means for generating control signals to the registry adjusting means (126) in accordance with the relative positions of the registration marks (202, 203, 204, 205, 206). Registration marks (202, 203, 204, 205, 206) include a portion having symmetrical sides diagonal to the direction of the web motion.
Inventors
- 👤 Jeffrey W. Sainio
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:27
CPC Classifications
B; B41; B41F; B41F13/00; B41F13/08; B41F13/10; B41F13/12; B41F33/00; B41F33/0081
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A system for maintaining registry between a plurality of printing units (102-105), cooperating with a moving web (110), the system being of the type wherein the printing units (102-105) include means (116, 117, 118, 119) for placing respective registration marks (202, 203, 204, 205, 206) on the web (110), the relative positions of the marks (202, 203, 204, 205, 206) being indicative of registry between the printing units (102-105), and further including means (126) responsive to control signals applied thereto for adjusting the registry of the printing units (102-105), and means for generating control signals to the registry adjusting means (126) in accordance with the relative positions of the registration marks (202, 203, 204, 205,-206); characterized in that: the registration marks (202, 203, 204, 205, 206) include a portion having symmetrical sides diagonal to the direction of the web motion.
Claim 2
Independent Claim
140 words
A system for maintaining registry between a plurality of printing units (102-105), cooperating with a moving web (110), the system being of the type wherein the printing units (102-105) include means (116, 117, 118, 119) for placing respective registration marks (202, 203, 204, 205, 206) on the web (110), the relative positions of the marks (202, 203, 204, 205, 206) being indicative of registry between the printing units (102-105), and further including means (126) responsive to control signals applied thereto for adjusting the registry of the printing units (102-105), and means for generating control signals to the registry adjusting means (126) in accordance with the relative positions of the registration marks (202, 203, 204, 205,-206); characterized in that: the registration marks (202, 203, 204, 205, 206) include a portion having symmetrical sides diagonal to the direction of the web motion.
Claim 3
Dependent Claim
22 words
The system of claim 1, wherein the registration marks (202, 203, 204, 205, 206) are in the shape of right angle diamonds.
Claim 4
Dependent Claim
56 words
The system of claim 1, further characterized in that the means for generating control signals includes: means (122, 122A) for detecting images on a predetermined area of the web (110), the area being of an extent in a direction transverse to web movement greater than the extent of the registration marks (202, 203, 204, 205, 206).
Claim 5
Dependent Claim
59 words
The system of claim 3 wherein the means (122, 122A) for detecting images are optical line scanners (300) which generate scan signals indicative of the markings (202, 203, 204, 205, 206), of the web (110) in respective cells, along a line of a predetermined number of the cells, as the web (110) moves relative to the printing units (102-105).
Claim 6
Dependent Claim
73 words
The system of claim 3, further characterized in that the means for generating control signals includes: means (144, 142, 150, 152, 510, 512, 514, 515, 516, 518, 519, 520) for determining from the images, the relative positions of the marks; means (142, 144, 150, 522, 524) for determining deviations of the relative positions from a predetermined value; and means (142, 144, 150, 526) for generating the control signals in accordance with the deviations.
Claim 7
Independent Claim
168 words
A method for maintaining registry between a plurality of rotating cylinders (116, 117, 118, 119) cooperating with a moving web (110), characterized by the steps of: placing on the web (110) a respective registration mark (202, 203, 204, 205, 206) of predetermined size and shape for each cylinder (116, 117, 118, 119), the relative positions (d X1 , d X2 , d X3 , d X4 ) of the marks (202, 203, 204, 205, 206), being indicative of the relative cylindrical and transverse position of the cylinders (116, 117, 118, 119) with respect to the web (110); generating signals indicative of transi- tions in image intensity on the web (110) along successive lines (SCAN1, SCAN2, SCAN3) transverse to the direction of movement of the web (110); determining from the transitions the relative position of the marks (202, 203, 204, 205, 206); and adjusting the cylinders (116, 117, 118, 119) in accordance with deviations in the relative positions of the marks (202, 203, 204, 205, 206) from predetermined values.
Claim 8
Independent Claim
168 words
A method for maintaining registry between a plurality of rotating cylinders (116, 117, 118, 119) cooperating with a moving web (110), characterized by the steps of: placing on the web (110) a respective registration mark (202, 203, 204, 205, 206) of predetermined size and shape for each cylinder (116, 117, 118, 119), the relative positions (d X1 , d X2 , d X3 , d X4 ) of the marks (202, 203, 204, 205, 206), being indicative of the relative cylindrical and transverse position of the cylinders (116, 117, 118, 119) with respect to the web (110); generating signals indicative of transi- tions in image intensity on the web (110) along successive lines (SCAN1, SCAN2, SCAN3) transverse to the direction of movement of the web (110); determining from the transitions the relative position of the marks (202, 203, 204, 205, 206); and adjusting the cylinders (116, 117, 118, 119) in accordance with deviations in the relative positions of the marks (202, 203, 204, 205, 206) from predetermined values.
Claim 9
Dependent Claim
109 words
The method of claim 6 wherein the marks (202, 203, 204, 205, 206), are symmetrical, and the determining relative position step comprises: determining the distance between transi- tions (208, 210) in the lines, and the center point (222) between the transitions; identifying pairs of transitions associated with the individual marks; determining for each individual mark (202, 203, 204, 205, 206), from pairs of transi- tions associated with the mark, the coordinates of center point of the mark; normalizing the center point coordinates of the marks (202, 203, 204, 205, 206) with respect to a predetermined one of the marks; and comparing the normalized center point coordinates to predetermined values.
Claim 10
Dependent Claim
61 words
The method of claim 6, wherein the generating signals indicative of transition step comprises: sequentially scanning the image intensity in successive nominal pixels (PIXEL 1 ... PIXEL 512) disposed along a line transverse to the direction of movement of the web (110), the movement of the web (110) causing images in successive portions of the web (110) to be detected. '
References Cited (Backward Citations)
No citation records indexed.
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