US3706490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exact length adjustment mechanism for copying machine
Assignee: COPYSTATICS Inc C/O LOWENTHAL A DE CORP
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Filing: 1970-10-27
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Granted: 1972-12-19
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Expires: 1990-10-27
Abstract
Abstract A mechanism for controlling the cutting from a roll of a sheet of copy paper whose length is the same as that of an original document fed into a copying machine. As in conventional systems, the leading edge of the original document is sensed to start the feed of copy paper. When the trailing edge of the original document is sensed, a knife operates to cut the copy paper and to stop further feed from the copy paper roll. As is known for systems of this type, the length of the copy paper sheet can be too short or too long, and the leading edges of the original and the copy sheet may not be in optical synchronization. The synchronization problem is overcome by providing an adjustably positioned sensor in the path of the original document. The length of the cut copy sheet is controlled by the setting of a potentiometer in an RC circuit coupled to the relay which controls the copy paper feed and the operation of the knife.
Inventors
- 👤 T F Aasen
- 👤 Thomas E Hartman
- 👤 Martin Schaffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
182 words
A mechanism for controlling optical synchronization between an original document and a copy sheet in a copying machine and the cutting of a copy sheet from a roll of copy paper whose length equals the length of the original document comprising means in the forward path of movement of said original document for detecting the leading and trailing edges thereof, control means responsive to the detection of the leading edge of said original document by said detecting means for initiating the feed of copy paper from said roll and responsive to the detection by said detecting means of the trailing edge of said original document for terminating the feed of copy paper from said roll and for cutting the copy paper previously fed from said roll, means for enabling the position of said detecting means to be varied in the forward path of movement of said original document, an electrical adjustment means coupled to said control means for enabling the duration of the feed of said copy paper to be varied selectively a predetermined amount for each operation of said detecting means.
Claim 2
Dependent Claim
182 words
A mechanism for controlling optical synchronization between an original document and a copy sheet in a copying machine and the cutting of a copy sheet from a roll of copy paper whose length equals the length of the original document comprising means in the forward path of movement of said original document for detecting the leading and trailing edges thereof, control means responsive to the detection of the leading edge of said original document by said detecting means for initiating the feed of copy paper from said roll and responsive to the detection by said detecting means of the trailing edge of said original document for terminating the feed of copy paper from said roll and for cutting the copy paper previously fed from said roll, means for enabling the position of said detecting means to be varied in the forward path of movement of said original document, an electrical adjustment means coupled to said control means for enabling the duration of the feed of said copy paper to be varied selectively a predetermined amount for each operation of said detecting means.
Claim 3
Dependent Claim
53 words
A mechanism in accordance with claim 1 wherein said detecting means is a photo-detector and said adjustment means includes means for delaying the termination of said copy paper feed and the cutting of said copy paper for a predetermined time interval after said detecting means detects the trailing edge of said original document.
Claim 4
Dependent Claim
32 words
A mechanism in accordance with claim 2 wherein said control means includes a relay coil and said adjustment means includes a capacitor and an adjustable resistor connected in series across said coil.
Claim 5
Dependent Claim
55 words
A mechanism in accordance with claim 1 wherein said detecting means is a switch having a finger movable by an original document engaging therEwith and said adjustment means includes means for delaying the initiation of copy paper feed for a predetermined time interval after said detecting means detects the leading edge of an original document.
Claim 6
Dependent Claim
43 words
A mechanism in accordance with claim 4 wherein said control means includes a relay coil and said adjustment means includes a capacitor coupled across said coil and a variable resistor connected in series with said detecting means and said relay coil and capacitor.
Claim 7
Dependent Claim
152 words
A mechanism for controlling optical synchronization between an original document and a copy sheet in a copying machine and the cutting of a copy sheet from a roll of copy paper whose length equals the length of the original document comprising means in the forward path of movement of said original document for detecting the leading and trailing edges thereof, control means responsive to the detection of the leading edge of said original document by said detecting means for initiating the feed of copy paper from said roll and responsive to the detection by said detecting means of the trailing edge of said original document for terminating the feed of copy paper from said roll and for cutting the copy paper previously fed from said roll, and means for delaying the response of said control means to detection of the leading and trailing edges of said original document by said detecting means.
Claim 8
Dependent Claim
152 words
A mechanism for controlling optical synchronization between an original document and a copy sheet in a copying machine and the cutting of a copy sheet from a roll of copy paper whose length equals the length of the original document comprising means in the forward path of movement of said original document for detecting the leading and trailing edges thereof, control means responsive to the detection of the leading edge of said original document by said detecting means for initiating the feed of copy paper from said roll and responsive to the detection by said detecting means of the trailing edge of said original document for terminating the feed of copy paper from said roll and for cutting the copy paper previously fed from said roll, and means for delaying the response of said control means to detection of the leading and trailing edges of said original document by said detecting means.
Claim 9
Dependent Claim
22 words
A mechanism in accordance with claim 6 wherein said delaying means is adjustable to selectively vary the feed of said copy paper.
Claim 10
Dependent Claim
17 words
A mechanism in accordance with claim 7 wherein said adjustable delaying means includes an adjustable resistor-capacitor network.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |