Patent US3636442A successfully refreshed from Google Patents.
US3636442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection system for detecting holes in photocopying paper
Assignee: Ricoh Co Ltd
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Filing: 1969-11-18
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Granted: 1972-01-18
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Expires: 1989-11-18
Abstract
Abstract A device for detecting defect holes and the like in photocopying paper wherein an electrically conductive detection roller is disposed in electrically insulated relation with a main body of a photographic sensitizing agent application device at a position where a base sheet passes with its back surface being wrapped over said detection roller while the agent applied to the front surface being not yet sufficiently dried. The detection roller is electrically partitioned in the axial direction into a plurality of sections so that depending upon the width of the base sheet to be used, a required number of said sections is electrically connected with each other through slip rings.
Inventors
- 👤 Manabu Doi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A system for detecting defect holes in photocopying paper used with a photographic sensitizing agent comprising a container having fluid sensitizing agent therein, said sensitizing agent being electrically conductive; roller means partially submerged in said sensitizing agent; a tension roller positioned above said roller means in abutting relation and providing a nip for said paper to pass therethrough; an electrically conductive guide roller spaced from said tension roller and positioned so that said paper can pass therearound; a power source and electrical detector provided in a circuit connected to said sensitizing agent, said guide roller and said photocopying paper, said photocopying copy paper being electrically insulating and normally preventing completion of said circuit when said paper is free from defects; said guide roller formed with spaced areas, each area being in the form of a cylinder and separated from an adjacent area by insulating means; individual electrical conducting means connected respectively between said detector and each cylindrical area; and said detector providing a signal corresponding to the number of individual circuits completed to said cylindrical areas when a defect hole in said paper allows electrically conductive sensitizing agent to pass through said paper into contact with said areas.
Claim 2
Independent Claim
198 words
A system for detecting defect holes in photocopying paper used with a photographic sensitizing agent comprising a container having fluid sensitizing agent therein, said sensitizing agent being electrically conductive; roller means partially submerged in said sensitizing agent; a tension roller positioned above said roller means in abutting relation and providing a nip for said paper to pass therethrough; an electrically conductive guide roller spaced from said tension roller and positioned so that said paper can pass therearound; a power source and electrical detector provided in a circuit connected to said sensitizing agent, said guide roller and said photocopying paper, said photocopying copy paper being electrically insulating and normally preventing completion of said circuit when said paper is free from defects; said guide roller formed with spaced areas, each area being in the form of a cylinder and separated from an adjacent area by insulating means; individual electrical conducting means connected respectively between said detector and each cylindrical area; and said detector providing a signal corresponding to the number of individual circuits completed to said cylindrical areas when a defect hole in said paper allows electrically conductive sensitizing agent to pass through said paper into contact with said areas.
Claim 3
Dependent Claim
65 words
A system according to claim 1 in which a hollow shaft is provided for said guide roller, said individual electrical conducting means comprises a plurality of slip rings mounted on said shaft, said slip rings corresponding in number to the number of said cylindrical areas, and each slip ring having an electrical connection passing through said hollow shaft for connection to its respective corresponding area.
Claim 4
Dependent Claim
20 words
A system according to claim 1 in which the widths of said cylindrical areas vary with respect to each other.
Claim 5
Dependent Claim
27 words
A system according to claim 1 in which the dimension of said tension roller along its longitudinal axis is less than the width of said photocopying paper.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |