Patent US3820889A successfully refreshed from Google Patents.
US3820889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy sheet guide device in electrophotographic copying machine
Assignee: Canon Inc
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Filing: 1972-11-21
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Granted: 1974-06-28
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Expires: 1992-11-21
Abstract
Abstract In an electrophotographic copying machine of the image transfer type, a guide device for guiding a transfer medium (imagereceiving copy sheet) toward a photosensitive medium or drum from which the image is transferred, comprising transport roll means and a pair of parallel upper and lower transfer medium guide plates provided between the transport roll means and the photosensitive medium and adapted to guide a transfer medium between the guide plates. The upper guide plate, which lies adjacent to the back side of the transfer medium in the portion of its path immediately before image transfer, has the forward end edge thereof formed into a convex curve with respect to the surface of the photosensitive medium. The forward end edge of the lower plate may be straight or concave.
Inventors
- 👤 K Miyamoto
- 👤 H Nitanda
- 👤 H Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/165
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
In a copying machine of the image transfer type, said machine having an image bearing medium, a copy medium guide device for guiding a copy medium toward said image bearing medium, said device comprising: copy medium transport roll means; and a pair of copy medium guide plates disposed in parallel with a spacing therebetween and provided between said transport roll means and said image bearing medium to receive a copy medium therebetween and to guide said copy medium into contact with said image bearing medium, wherein each said plate has a copymedium-receiving end edge adjacent said roll means, and a copymedium-discharging end edge adjacent said image bearing medium, and wherein one of said guide plates is for guiding the back side of the copy medium and has its said discharging end edge formed into a convex curve with respect to the surface of said image bearing medium.
Claim 2
Dependent Claim
147 words
In a copying machine of the image transfer type, said machine having an image bearing medium, a copy medium guide device for guiding a copy medium toward said image bearing medium, said device comprising: copy medium transport roll means; and a pair of copy medium guide plates disposed in parallel with a spacing therebetween and provided between said transport roll means and said image bearing medium to receive a copy medium therebetween and to guide said copy medium into contact with said image bearing medium, wherein each said plate has a copymedium-receiving end edge adjacent said roll means, and a copymedium-discharging end edge adjacent said image bearing medium, and wherein one of said guide plates is for guiding the back side of the copy medium and has its said discharging end edge formed into a convex curve with respect to the surface of said image bearing medium.
Claim 3
Dependent Claim
51 words
A copy medium guide device as set forth in claim 1, wherein the other one of said guide plates is for guiding the image-receiving surface of the copy medium and has its said discharging end edge thereof formed into a straight line parallel to the surface of said image bearing medium.
Claim 4
Dependent Claim
50 words
A copy medium guide device according to claim 1, wherein the other one of said guide plates is for guiding the image-receiving surface of the copy medium and has its said discharging end edge thereof formed into a concave curve with respect to the surface of said image bearing medium.
Claim 5
Dependent Claim
18 words
A copy medium guide device according to claim 1, wherein said image bearing medium comprises a photosensitive drum.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |