US3689151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microfilm flow type apparatus
Assignee: Agfa Gevaert AG
•
Filing: 1970-04-15
•
Granted: 1972-09-05
•
Expires: 1990-04-15
Abstract
Abstract An apparatus for scanning a succession of sheets which are transported through a scanning station; the scanning apparatus is useful, for example, in the reproduction of the material on such sheets on microfilm. A first driven transport means conducts the sheets to the scanning station; a second driven transport means conducts them away from such station. The two transport means are driven by a common motor which is under the control of a novel circuit means which stops the motor if a sheet, having been grasped and conveyed by the first transport means, fails to reach the second transport means within a predetermined time interval thereafter. The circuit also provides for the control of the film transport of an associated camera, and for the counting of sheets passing through the apparatus.
Inventors
- 👤 Wilfried Hofmann
- 👤 Josef Pfeifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:52
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6207; G03B27/625; G03B27/6257
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
211 words
Apparatus for scanning a plurality of sheets which are fed in succession through the apparatus, comprising driven transport means for moving sheets to be scanned through a scanning station, a first sheet detector positioned upstream of the scanning station, a second sheet detector positioned downstream of the scanning station, said transport means normally moving the leading end of a sheet from the first to the second detector in a predetermined first time interval, and signal means operative when a given second time interval at least slightly greater than the first time interval elapses between passage of the leading end of a sheet from the first to the second sheet detector, and a control circuit, means for energizing the control circuit, wherein the first and second sheet detector include series connected first and second switches, respectively, the signal means includes a relay having a coil selectively energized by the control circuit, a third, normally open switch in the control circuit, and time delay circuit means for closing the third switch to energize the relay coil at the end of said second time interval, said second time interval starting at the first instant that both the first and second switches are closed during the handling of said sheet by the sheet transport means.
Claim 2
Dependent Claim
211 words
Apparatus for scanning a plurality of sheets which are fed in succession through the apparatus, comprising driven transport means for moving sheets to be scanned through a scanning station, a first sheet detector positioned upstream of the scanning station, a second sheet detector positioned downstream of the scanning station, said transport means normally moving the leading end of a sheet from the first to the second detector in a predetermined first time interval, and signal means operative when a given second time interval at least slightly greater than the first time interval elapses between passage of the leading end of a sheet from the first to the second sheet detector, and a control circuit, means for energizing the control circuit, wherein the first and second sheet detector include series connected first and second switches, respectively, the signal means includes a relay having a coil selectively energized by the control circuit, a third, normally open switch in the control circuit, and time delay circuit means for closing the third switch to energize the relay coil at the end of said second time interval, said second time interval starting at the first instant that both the first and second switches are closed during the handling of said sheet by the sheet transport means.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1, wherein the first switch is normally open and is closed by the passage of a sheet past the first sheet detector, and the second switch is normally closed and is opened by the passage of a sheet past the second sheet detector.
Claim 4
Dependent Claim
62 words
Apparatus according to claim 2, comprising a DC source for the control circuit and wherein the third switch has a control electrode which selectively rEnders the third switch conductive, and the time delay circuit means includes an RC circuit having a series connected resistance and condenser connected in parallel with the relay coil and to the control electrode of the third switch.
Claim 5
Dependent Claim
64 words
Apparatus according to claim 3, wherein the third switch is a thyristor, and comprising a unijunction transistor having its first base electrode connected to the negative side of the control circuit and its second base electrode connected to the positive side of the control circuit, the emitter of the unijunction transistor being connected to the positive side of the condenser in the RC circuit.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 1, comprising means to count the number of sheets passing through the scanning station, and means actuated by the second sheet detector for operating the sheet counter.
Claim 7
Dependent Claim
73 words
Apparatus according to claim 1, comprising means which measures the elapsed time following passage of the leading end of a sheet by the first sheet detector, and wherein the signal means is rendered operative by the elapsed time measuring means when a given second time interval at least slightly greater than the first time interval elapses between passage of the leading end of a sheet from the first to the second sheet detector.
References Cited (Backward Citations)
US2461185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |