US3859649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web sensing apparatus
Assignee: DYKE RESEARCH CORP VAN
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Filing: 1972-10-02
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Granted: 1975-01-07
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Expires: 1992-10-02
Abstract
Abstract For use in a xerographic copier/duplicator machine in which paper is fed from a continuous roll and cut to the desired length within the machine, an arrangement for monitoring the movement of the paper and also for providing a visual display of the width of the roll. The paper is caused to continuously move past a sensing station constituting a number of deflectable leaves. A suitable logic circuit coupled to the leaves determines the width of the paper, and provides a warning signal when the paper is exhausted or when it is not being properly fed. The warning signal may be used to halt the operation of the machine so as to prevent jamming or other malfunction of the machine.
Inventors
- 👤 William Frederick Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6517; B; B65; B65H; B65H23/00; B65H23/02; B65H23/0204; B65H26/00; B65H26/02; B65H26/025; Y; Y10; Y10S; Y10S200/00; Y10S200/11
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
Web sensing apparatus, comprising: a web supporting plate having a web supporting surface with a central aperture and a plurality of laterally displaced pairs of apertures therein, the apertures of each pair being disposed on opposite sides of said central aperture; a central web sensing leaf and a plurality of pairs of web sensing leaves, each leaf extending through a corresponding one of said apertures and protruding outwardly from said web supporting surface, each leaf being resiliently mounted for inward deflection upon engagement by a web disposed on said web supporting surface; the lateral distance between the outer pair of leaves most laterally displaced from said central aperture being greater than the width of the widest web to be accommodated by said apparatus; a plurality of switching elements, each element being responsive to the position of a corresponding one of said leaves with respect to said web supporting surface; and a logic circuit coupled to said switching elements for providing a web width signal indicative of the width of an elongated web longitudinally disposed on said plate betweEn said outer leaves, and for providing a warning signal (i) when said central leaf is not inwardly deflected, (ii) when only one leaf of any pair is inwardly deflected, and (iii) when either of said outer leaves is inwardly deflected.
Claim 2
Dependent Claim
218 words
Web sensing apparatus, comprising: a web supporting plate having a web supporting surface with a central aperture and a plurality of laterally displaced pairs of apertures therein, the apertures of each pair being disposed on opposite sides of said central aperture; a central web sensing leaf and a plurality of pairs of web sensing leaves, each leaf extending through a corresponding one of said apertures and protruding outwardly from said web supporting surface, each leaf being resiliently mounted for inward deflection upon engagement by a web disposed on said web supporting surface; the lateral distance between the outer pair of leaves most laterally displaced from said central aperture being greater than the width of the widest web to be accommodated by said apparatus; a plurality of switching elements, each element being responsive to the position of a corresponding one of said leaves with respect to said web supporting surface; and a logic circuit coupled to said switching elements for providing a web width signal indicative of the width of an elongated web longitudinally disposed on said plate betweEn said outer leaves, and for providing a warning signal (i) when said central leaf is not inwardly deflected, (ii) when only one leaf of any pair is inwardly deflected, and (iii) when either of said outer leaves is inwardly deflected.
Claim 3
Dependent Claim
40 words
Apparatus according to claim 1, further including web drive means for causing an elongated web to progress longitudinally across said web supporting surface, and control means responsive to said warning signal for modifying the operation of said web drive means.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 2, wherein said control means responds to said warning signal to cause said web drive means to halt the movement of said web across said web supporting surface.
Claim 5
Dependent Claim
40 words
Apparatus according to claim 1, wherein each leaf is pivotally mounted adjacent a corresponding one of said switching elements, so that a corresponding element is actuated by pivotal movement of a leaf upon engagement of said leaf by said web.
Claim 6
Dependent Claim
17 words
Apparatus according to claim 1, further including a web width display responsive to said web width signal.
References Cited (Backward Citations)
US1468754A
Cited
US2653536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |