US4593990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for controlling a diaphragm slot in a microfilm-reading and enlarging apparatus
Assignee: Agfa Gevaert AG
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Filing: 1985-04-01
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Granted: 1986-06-10
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Expires: 2005-04-01
Abstract
Abstract A device for controlling the width of a slot of a diaphragm of a microfilm-reading-and-copying apparatus in which an enlarged microimage is projected by two inclined mirrors mounted on a movable carriage and via the slot of the diaphragm on a copying cylinder. The diaphragm is formed by two flaps of which one is stationary and another one is movable between a closed position to close the slot and a plurality of open positions to adjust the width of the slot. The drive of the movable flap is provided with a rotatable cam which is coupled to the movable carriage.
Inventors
- 👤 Josef Auer
- 👤 Hubert Hackenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:57
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/118
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
155 words
A control device for controlling a slot in a diaphragm of a microfilm-reading-and-enlarging apparatus of the type including an illumination system, a projection lens having an optical axis, a movable carriage carrying thereon two mirrors facing each other and inclined at 45° relative to said optical axis, a diaphragm having a slot, and a copying cylinder rotatable synchronously with the movement of said carriage and wherein an enlarged microimage is projected in columns by said mirrors and through said slot onto said copying cylinder, the control device comprising means for adjusting said slot, said diaphragm including two flaps having edges forming said slot, at least one of said flaps being movable from a position closing said slot to a plurality of various open positions in which various widths of said slot are obtained, said adjusting means being operative for moving one of said flaps to each position, said adjusting means being coupled with said carriage.
Claim 2
Dependent Claim
155 words
A control device for controlling a slot in a diaphragm of a microfilm-reading-and-enlarging apparatus of the type including an illumination system, a projection lens having an optical axis, a movable carriage carrying thereon two mirrors facing each other and inclined at 45° relative to said optical axis, a diaphragm having a slot, and a copying cylinder rotatable synchronously with the movement of said carriage and wherein an enlarged microimage is projected in columns by said mirrors and through said slot onto said copying cylinder, the control device comprising means for adjusting said slot, said diaphragm including two flaps having edges forming said slot, at least one of said flaps being movable from a position closing said slot to a plurality of various open positions in which various widths of said slot are obtained, said adjusting means being operative for moving one of said flaps to each position, said adjusting means being coupled with said carriage.
Claim 3
Dependent Claim
49 words
The control device as defined in claim 1; and including drive means for reciprocally moving said carriage, said drive means including a crank drive and driven chain means connected to said drive, said chain means including a wheel, said adjusting means including a cam disc coupled with said wheel.
Claim 4
Dependent Claim
46 words
The control device as defined in claim 2, wherein said adjusting means further include at least one control arm coupled to said one flap and at least one cam element mounted to said cam disc for joint rotation, said control arm cooperating with said cam element.
Claim 5
Dependent Claim
45 words
The control device as defined in claim 3, wherein an edge of one of said two flaps forming said slot extends parallel to an axis of said cylinder over a straight line while an edge of another of said flaps forming said slot is curved.
Claim 6
Dependent Claim
17 words
The control device as defined in claim 4, wherein the edge of the movable flap is straight-lined.
Claim 7
Dependent Claim
26 words
The control device as defined in claim 3, wherein said movable flap is a plate having ends, two said control arms being connected to said ends.
Claim 8
Dependent Claim
18 words
The control device as defined in claim 3, wherein said control arm is pivotable about a pivot axle.
Claim 9
Dependent Claim
35 words
The control device as defined in claim 7, wherein said control arm includes two levers angularly positioned relative to each other, one of said levers having a free end which lies on said cam element.
Claim 10
Dependent Claim
21 words
The control device as defined in claim 8, wherein said control arm further includes an adjusting bolt arranged between said levers.
Claim 11
Dependent Claim
24 words
The control device as defined in claim 9, wherein said adjusting means further include a spring biasing said control arm against said cam element.
Claim 12
Dependent Claim
29 words
The control device as defined in claim 10, wherein another of said two levers rests on said adjusting bolt under the action of said spring in a force-locking fashion.
Claim 13
Dependent Claim
86 words
The control device as defined in claim 11, wherein said cam element has a cam surface extending over 360° and has an angular cam portion corresponding to the movement of said carriage before and after a copying process, said angular cam portion having a pitch line having a smaller radius R 3 , whereby when said free end of said control arm cooperates with said angular cam portion of said cam element said one movable flap overlaps another of said flaps to cause said closing position.
Claim 14
Dependent Claim
44 words
The control device as defined in claim 12, wherein said cam surface includes a further angular cam portion, whereby when said free end cooperates with said further angular portion the latter effects the movement of said movable flap to a plurality of open positions.
Claim 15
Dependent Claim
82 words
The control device as defined in claim 13, wherein said further angular cam portion has radii R 1 and R 2 , wherein radius R 1 is the greatest radius on the cam element and effects the movement of said movable flap to its remotest open position from said another flap to provide the slot of the greatest width and radius R 2 extends in the middle of said further angular cam portion, and wherein R 3 <R 2 <R 1 .
Claim 16
Dependent Claim
58 words
The control device as defined in claim 11, further including an additional cam element coupled to said cam disc and vertically offset relative to said at least one cam element, said control arm being displaceably supported on said pivot axle and being selectively brought into engagement with said at least one cam element or said additional cam element.
Claim 17
Dependent Claim
49 words
The control device as defined in claim 15, further including switch means, said adjusting means further including a switch cam mounted to said cam disc for joint rotation and cooperating with said switch means for switching on and off said drive means and for switching over said illumination system.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |