Patent US3618932A successfully refreshed from Google Patents.
US3618932A
Expired / Lapsed
US
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Document feeder control system
Assignee: Recognition Equipment Inc
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Filing: 1969-09-22
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Granted: 1971-11-09
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Expires: 1989-09-22
Abstract
Abstract A control system for document feeders of the type having a document advancing paddle includes a fluidic OR gate and a pressure-sensitive switch. The OR gate normally activates the switch which in turn connects operating power to a paddle advancing motor. The OR gate includes control ports that are coupled to the faceplate and bottom plate ducts in the feeder. Whenever one of the ducts is blocked, the OR gate deactivates the switch and thereby stops the operation of the paddle.
Inventors
- 👤 Victor M Moreland
- 👤 Ernest L Staples Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:59
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/001; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2229; Y10T137/224; Y10T137/2245
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
In a document-feeding system of the type including face and bottom plates, a motor-driven paddle for advancing documents over the bottom plate toward the faceplate, face ducts formed in the faceplate for directing air towards the documents advanced by the paddle, and bottom ducts formed in the bottom plate for directing air between documents advanced by the paddle, a paddle control system comprising: a pressure-sensitive switch for controlliNg the operation of the paddle motor, and fluidic logic means responsive to the flow of air through the face and bottom ducts for controlling the switch and thereby controlling the operation of the motor.
Claim 2
Dependent Claim
102 words
In a document-feeding system of the type including face and bottom plates, a motor-driven paddle for advancing documents over the bottom plate toward the faceplate, face ducts formed in the faceplate for directing air towards the documents advanced by the paddle, and bottom ducts formed in the bottom plate for directing air between documents advanced by the paddle, a paddle control system comprising: a pressure-sensitive switch for controlliNg the operation of the paddle motor, and fluidic logic means responsive to the flow of air through the face and bottom ducts for controlling the switch and thereby controlling the operation of the motor.
Claim 3
Dependent Claim
46 words
The system according to claim 1 wherein the fluidic logic means is a monostable device that normally operates the switch to advance the paddle and that operates the switch to stop the paddle in response to a change in the flow of air through the ducts.
Claim 4
Dependent Claim
40 words
The system according to claim 1 wherein the fluidic logic means is an OR gate that controls the switch to interrupt the operation of the paddle motor whenever either the face ducts or the bottom ducts are blocked by documents.
Claim 5
Dependent Claim
95 words
In a document feeder of the type including face and bottom plates, a paddle for advancing documents over the bottom plate toward the faceplate, a paddle-advancing mechanism, and ducts for directing air through the plates, the improvement comprising: a fluidic OR gate for alternately producing two outputs, one indicative of the movement of air through all of the ducts and the other indicative of a document in a blocking position with respect to at least one of the ducts, and means responsive to the first output of the OR gate for activating the paddle-advancing mechanism.
Claim 6
Dependent Claim
95 words
In a document feeder of the type including face and bottom plates, a paddle for advancing documents over the bottom plate toward the faceplate, a paddle-advancing mechanism, and ducts for directing air through the plates, the improvement comprising: a fluidic OR gate for alternately producing two outputs, one indicative of the movement of air through all of the ducts and the other indicative of a document in a blocking position with respect to at least one of the ducts, and means responsive to the first output of the OR gate for activating the paddle-advancing mechanism.
Claim 7
Dependent Claim
35 words
The document feeder according to claim 4 wherein the fluidic OR gate includes control ports connected to the ducts so that the OR gate produces the second output whenever one of the ducts is blocked.
Claim 8
Dependent Claim
40 words
The document feeder according to claim 5 wherein the fluidic OR gate is a monostable device that normally produces the first output and that produces the second output only so long as at least one of the ducts is blocked.
Claim 9
Dependent Claim
112 words
A document feeder control system, comprising: a reference plane; a paddle for advancing documents with respect to the reference plane; means for advancing the paddle; a duct extending to the reference plane; means for directing air through the duct; fluidic logic means responsive to a flow of air through the duct to produce a first output and responsive to the absence of a flow of air through the duct to produce a second output, and means responsive to the fluidic logic means for operating the paddle-advancing means whenever the logic means produces one of its outputs and for disabling the paddle-advancing means whenever the logic means produces the other of its outputs.
Claim 10
Dependent Claim
112 words
A document feeder control system, comprising: a reference plane; a paddle for advancing documents with respect to the reference plane; means for advancing the paddle; a duct extending to the reference plane; means for directing air through the duct; fluidic logic means responsive to a flow of air through the duct to produce a first output and responsive to the absence of a flow of air through the duct to produce a second output, and means responsive to the fluidic logic means for operating the paddle-advancing means whenever the logic means produces one of its outputs and for disabling the paddle-advancing means whenever the logic means produces the other of its outputs.
Claim 11
Dependent Claim
50 words
The system according to claim 7 wherein the fluidic logic means has an inlet and two outlets and operates to alternately direct air from the inlet through the two outlets to produce the two outputs and wherein the directing means also directs air to the inlet of the logic means.
Claim 12
Dependent Claim
48 words
The system according to claim 7 wherein the fluidic logic means has a control port the energization of which controls which output is produced by the logic means and further including a connection between the duct and the port for energizing the port whenever the duct is blocked.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |