Patent US3783293A successfully refreshed from Google Patents.
US3783293A
Expired / Lapsed
US
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Register control systems
Assignee: Crosfield Electronics Ltd
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Filing: 1972-03-10
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Granted: 1974-01-01
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Expires: 1992-03-10
Abstract
Abstract In a method of register control two or more register marks, corresponding to different operations performed on the web, are printed on the web, one behind the other in a track extending in the direction of travel of the web, the marks being separated from one another by a predetermined distance when register is correct. A mark is recognised when a photocell signal indicates clear space in the track for a predetermined distance (longer than the nominal separation between the marks) followed by the leading mark. It may also be required for recognition that the mark thickness is less than a given amount and that the mark is followed by at least a predetermined length of clear space. When a mark is recognition, a register comparison is made between the positions in the track of the leading mark and the next mark. The circuit discriminator against others print in the track and other register marks behind the two compared marks.
Inventors
- 👤 D Gold
- 👤 G Clinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:20
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1882
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
284 words
A method of web register control for registering more than two successively printed marks corresponding to more than two successively printed marks corresponding to more than two successive operations performed on the web, comprising: printing on a web two register marks one behind the other in a track extending in the direction of travel of the web alongside the area of the web to be printed, the marks corresponding to first and second operations performed on the web and being separated from one another by a predetermined distance when register is correct; sensing the presence of clear space in the said track on the moving web for a predetermined distance longer than the said predetermined separation between the marks; sensing the presence of the leading mark in the track following the said predetermined distance of clear space; and in response to the recognition of such a mark after the said clear space, conditioning a comparator system to make a register comparison between the positions of the leading mark and a subsequent mark; for each succeeding operation performed on the web, printing a corresponding new register mark ahead of those already printed in the direction of travel of the web so that the said new mark becomes the leading mark, sensing the presence of clear space iN the track for a further predetermined distance longer than the predetermined separation between correctly registered marks but shorter than the first predetermined distance by an amount equal to the said predetermined separation, and after recognition of each new leading mark comparing its position with the next mark, the remaining marks being ignored; and making register corrections in response to any register error signals from the said comparator system.
Claim 2
Independent Claim
284 words
A method of web register control for registering more than two successively printed marks corresponding to more than two successively printed marks corresponding to more than two successive operations performed on the web, comprising: printing on a web two register marks one behind the other in a track extending in the direction of travel of the web alongside the area of the web to be printed, the marks corresponding to first and second operations performed on the web and being separated from one another by a predetermined distance when register is correct; sensing the presence of clear space in the said track on the moving web for a predetermined distance longer than the said predetermined separation between the marks; sensing the presence of the leading mark in the track following the said predetermined distance of clear space; and in response to the recognition of such a mark after the said clear space, conditioning a comparator system to make a register comparison between the positions of the leading mark and a subsequent mark; for each succeeding operation performed on the web, printing a corresponding new register mark ahead of those already printed in the direction of travel of the web so that the said new mark becomes the leading mark, sensing the presence of clear space iN the track for a further predetermined distance longer than the predetermined separation between correctly registered marks but shorter than the first predetermined distance by an amount equal to the said predetermined separation, and after recognition of each new leading mark comparing its position with the next mark, the remaining marks being ignored; and making register corrections in response to any register error signals from the said comparator system.
Claim 3
Dependent Claim
39 words
A method as defined in claim 1, in which said comparator system is conditioned to make a register comparison only if the mark extends for not more than a predetermined distance in the direction of movement of the web.
Claim 4
Dependent Claim
45 words
A method as defined in claim 2, in which said comparator system is conditioned to make a register comparison only if a predetermined length of clear space in the track is sensed in the direction of movement of the web following the said leading mark.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |