US3687544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic copying machine
Assignee: Individual
•
Filing: 1970-03-11
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Granted: 1972-08-29
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Expires: 1990-03-11
Abstract
Abstract The invention relates to an electrophotographic copying machine comprising a stationary support for an original, of which one edge serves as a reference for locating the original that is to be copied, a likewise stationary imaging plane perpendicular thereto, in which an electrophotographic printing material is located, a mirror and an objective positively coupled for relative movement to permit different scale reproductions on the printing material in the imaging plane to be made of an original on its support.
Inventors
- 👤 Rudolf Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041; G03B; G03B27/00; G03B27/32; G03B27/34; G03B27/36; G03B27/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
An electro-photographic copying machine comprising a stationary support for an original, of which one edge serves as a reference for locating the originals that are to be copied, a likewise stationary imaging plane, perpendicular thereto, in which an electro-photographic recording material is located, a mirror and an objective positively coupled for relative movement to permit different scale reproduction on the recording material in the imaging plane to be made of an original on its support, the transverse edge nearest the imaging plane of the support for the original defining the fixed edge of the located original and the mirror and objective being adjustably movable in contrary directions in the direction of the optic axis of the objective, the relative displacement of the mirror and the objective being effected by a common screw spindle having threads of opposite hands and extending in the direction of the optic axis normal to the imaging plane.
Claim 2
Dependent Claim
152 words
An electro-photographic copying machine comprising a stationary support for an original, of which one edge serves as a reference for locating the originals that are to be copied, a likewise stationary imaging plane, perpendicular thereto, in which an electro-photographic recording material is located, a mirror and an objective positively coupled for relative movement to permit different scale reproduction on the recording material in the imaging plane to be made of an original on its support, the transverse edge nearest the imaging plane of the support for the original defining the fixed edge of the located original and the mirror and objective being adjustably movable in contrary directions in the direction of the optic axis of the objective, the relative displacement of the mirror and the objective being effected by a common screw spindle having threads of opposite hands and extending in the direction of the optic axis normal to the imaging plane.
Claim 3
Dependent Claim
44 words
The copying machine of claim 1 in which the threads of the screw spindle for displacing the mirror have a shorter pitch than the threads for displacing the objective whereby rotation of the screw spindle moves the mirror a shorter distance than the objective.
Claim 4
Dependent Claim
193 words
An electro-photographic copying machine comprising a stationary support for an original, of which one edge serves as a reference for locating the originals that are to be copied, a likewise stationary imaging plane, perpendicular thereto, in which an electro-photographic recording material is located, a mirror and an objective positively coupled for relative movement to permit different scale reproductions on the recording material in the imaging plane to be made of An original on its support, the transverse edge nearest the imaging plane of the support for the original defining the fixed edge of the located original and the mirror and objective being adjustably movable in contrary directions in the direction of the optic axis of the objective, the mirror and the objective being coupled for relative movement by a pair of screw spindles extending parallel to the optic axis, one of the screw spindles being connected to the mirror whereby rotation of said one screw spindle moves the mirror along the optic axis, the other screw spindle being connected to the objective whereby rotation of the other screw spindle moves the objective along the optic axis, and gear means connecting the screw spindles.
Claim 5
Dependent Claim
193 words
An electro-photographic copying machine comprising a stationary support for an original, of which one edge serves as a reference for locating the originals that are to be copied, a likewise stationary imaging plane, perpendicular thereto, in which an electro-photographic recording material is located, a mirror and an objective positively coupled for relative movement to permit different scale reproductions on the recording material in the imaging plane to be made of An original on its support, the transverse edge nearest the imaging plane of the support for the original defining the fixed edge of the located original and the mirror and objective being adjustably movable in contrary directions in the direction of the optic axis of the objective, the mirror and the objective being coupled for relative movement by a pair of screw spindles extending parallel to the optic axis, one of the screw spindles being connected to the mirror whereby rotation of said one screw spindle moves the mirror along the optic axis, the other screw spindle being connected to the objective whereby rotation of the other screw spindle moves the objective along the optic axis, and gear means connecting the screw spindles.
Claim 6
Dependent Claim
57 words
The copying machine of claim 3 in which the screw spindles are radially and axially offset in parallel to provide overlapping ends, the gear means including a gear wheel on each overlapping end of the spindles, the transmission ratio of the gear wheels being chosen according to the required relative displacements of the mirror and the objective.
Claim 7
Dependent Claim
36 words
The copying machine of claim 4 in which the gear wheels are replaceable by corrected gear wheels having the same pitch circles for adapting the transmission ratio to variations in the focal length of the objective.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |