US4448533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for ensuring the quality of printed products
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1982-03-15
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Granted: 1984-05-15
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Expires: 2002-03-15
Abstract
Abstract Monitoring device for densitometrically evaluating printed sheets with a printed print-monitoring strip includes holding means, a plurality of first densitometers for exclusively measuring full-tone density carried by the holding means at a selective spacing from one another so as to define respective gaps between the first densitometers, and a plurality of second densitometers for measuring at least one tone density value selected from a range of screen and full tone values, the second densitometers being receivable, respectively, in the gaps between the first densitometers and being connectible to a device for mathematically correlating the values measured by the second densitometers with quality-assessing parameters.
Inventors
- 👤 Willi Jeschke
- 👤 Hugo Rambausek
- 👤 Rudolf-Karl Uhrig
- 👤 Gerhard Loffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:39
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G03; G03F; G03F3/00; G03F3/10; G03F3/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
Monitoring device for densitometrically evaluating printed sheets with a printed print-monitoring strip, the printed sheets lying in a static position on a test bench outside the printing machine, comprising holding means displaceable in longitudinal and tranverse direction of the test bench, a plurality of first densitometers for exclusively measuring full-tone density carried by said holding means at a selective spacing from one another so as to define respective gaps between said first densitometers, and a plurality of second densitometers for simultaneously measuring at least one tone density value selected from a range of screen and full tone values, said second densitometers being received, respectively, in said gaps between said first densitometers and being connected to a device for mathematically correlating the values measured by said second densitometers with quality-assessing parameters.
Claim 2
Dependent Claim
130 words
Monitoring device for densitometrically evaluating printed sheets with a printed print-monitoring strip, the printed sheets lying in a static position on a test bench outside the printing machine, comprising holding means displaceable in longitudinal and tranverse direction of the test bench, a plurality of first densitometers for exclusively measuring full-tone density carried by said holding means at a selective spacing from one another so as to define respective gaps between said first densitometers, and a plurality of second densitometers for simultaneously measuring at least one tone density value selected from a range of screen and full tone values, said second densitometers being received, respectively, in said gaps between said first densitometers and being connected to a device for mathematically correlating the values measured by said second densitometers with quality-assessing parameters.
Claim 3
Dependent Claim
62 words
Monitoring device according to claim 1 including a print-monitoring strip underlying said holding means and having a plurality of test fields of given width consecutively disposed thereon, said holding means together with said first and second densitometers being axially slidable into a plurality of test positions corresponding to said widths of said test fields with respectively equal spacing between said test positions.
Claim 4
Dependent Claim
38 words
Monitoring device according to claim 2 wherein the test positions into which said holding means together with said first and second densitometers are slidable are four in number corresponding to the four colors of a four-color printing process.
Claim 5
Dependent Claim
49 words
Monitoring device according to claim 3 including a stationary color filter bar associated with and located opposite all of said plurality of first densitometers for exclusively measuring full-tone density, said color filter bar being free of any filters in regions thereof juxtaposed to said gaps between said first densitometers.
Claim 6
Dependent Claim
18 words
Monitoring device according to claim 4 including additonal color filters respectively associated with each of said second densitometers.
Claim 7
Dependent Claim
62 words
Monitoring device according to claim 5 including guide means, said holding means together with said first and second densitometers being mounted conjointly with said color filter bar and being displaceable therewith as a unit in said guide means and parallel to the leading edge of a printed sheet, and means for releasably fixing said holding means with respect to said guide means.
References Cited (Backward Citations)
US4003660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |