US3689142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure window of an electrostatic copying machine
Assignee: Minolta Co Ltd
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Filing: 1970-12-02
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Granted: 1972-09-05
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Expires: 1990-12-02
Abstract
Abstract An exposure window in an electrostatic copying machine for preventing electrostatic adherence of the advancing copy paper is formed of a flat transparent plate having deep wells in its rear face including a medial equilateral triangular well with its apex toward the plate trailing edge and a group of parallelogram wells on each side of the triangular wells, the wells being separated by thin partitions with parallel walls. The peripheral faces of the wells are perpendicular to the plate faces and the bases of the wells are parallel to the plate faces. The window plate has a guide slope formed on one edge for guiding the entry of a copy paper onto the plate for exposure.
Inventors
- 👤 Yorio Yamanoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/605
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
In an electrostatic copying machine, a transparent window plate having front and rear parallel flat faces, a backing plate disposed rearwardly of an confronting said window plate, means for longitudinally advancing a copy sheet between said plates from the trailing edge to the leading edge of said window plate, means for projecting an image through said window plate focused on said window plate rear face, said window plate having formed in the rear face thereof an equilateral triangular well symmetrical to the longitudinal axis of advance of said copy sheet with its apex directed toward said plate trailing edge, and a plurality of parallelogram wells on opposite sides of said triangular well and delineated from each other and from said triangular well by relatively thin partitions integral with said plate, the rear faces of said partitions being coplanar with said plate rear face and the bases of said wells being flat and parallel to said plate rear face and the peripheral faces of said wells being perpendicular to said window plate rear face.
Claim 2
Dependent Claim
173 words
In an electrostatic copying machine, a transparent window plate having front and rear parallel flat faces, a backing plate disposed rearwardly of an confronting said window plate, means for longitudinally advancing a copy sheet between said plates from the trailing edge to the leading edge of said window plate, means for projecting an image through said window plate focused on said window plate rear face, said window plate having formed in the rear face thereof an equilateral triangular well symmetrical to the longitudinal axis of advance of said copy sheet with its apex directed toward said plate trailing edge, and a plurality of parallelogram wells on opposite sides of said triangular well and delineated from each other and from said triangular well by relatively thin partitions integral with said plate, the rear faces of said partitions being coplanar with said plate rear face and the bases of said wells being flat and parallel to said plate rear face and the peripheral faces of said wells being perpendicular to said window plate rear face.
Claim 3
Dependent Claim
23 words
The copying machine of claim 1 wherein the trailing face of said window plate is rearwardly sloped from the trailing front edge thereof.
Claim 4
Dependent Claim
15 words
The copying machine of claim 1 wherein the opposite faces of said partitions are parallel
Claim 5
Dependent Claim
17 words
The copying machine of claim 1 wherein said wells are positioned proximate said window plate trailing edge.
Claim 6
Dependent Claim
18 words
The copy machine of claim 4 wherein said wells extend to points proximate said window plate leading edge.
Claim 7
Dependent Claim
160 words
An exposure window for an electrostatic copying machine of the type that only a copy paper is introduced into an exposing section between the window plate and a guide plate after being charged, characterized in that said window plate is made of a light permeable substance, and provided with, in its side opposing to said guide plate, a guide slope formed on one edge of the window plate for guiding the entry of a copy paper into said exposing section, an equilateral triangular recess as a reference at a point corresponding to the center of the copy paper passage, two groups of parallelogram recesses disposed on either side of the reference in such a manner that they spread out as an unfolded fan as they extend in the travelling direction of the copy paper, and ridges defined by each adjacent pair of the recesses, the faces of said window plate, recesses and ridges being flat and parallel with one another.
Claim 8
Dependent Claim
160 words
An exposure window for an electrostatic copying machine of the type that only a copy paper is introduced into an exposing section between the window plate and a guide plate after being charged, characterized in that said window plate is made of a light permeable substance, and provided with, in its side opposing to said guide plate, a guide slope formed on one edge of the window plate for guiding the entry of a copy paper into said exposing section, an equilateral triangular recess as a reference at a point corresponding to the center of the copy paper passage, two groups of parallelogram recesses disposed on either side of the reference in such a manner that they spread out as an unfolded fan as they extend in the travelling direction of the copy paper, and ridges defined by each adjacent pair of the recesses, the faces of said window plate, recesses and ridges being flat and parallel with one another.
Claim 9
Dependent Claim
28 words
An exposure window according to claim 6, wherein said equilateral triangular and parallelogram recesses are arranged adjacent to and along the guide slope of the exposure window plate.
Claim 10
Dependent Claim
22 words
An exposure window according to claim 6, wherein said equilateral triangular and parallelogram recesses extend throughout one surface of the exposure window.
References Cited (Backward Citations)
US2510863A
Cited
US3057997A
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 |