Apparatus and methods for positioning a document against a read head in a document processing system
View Patent ↗Apparatus and methods are described for controlling the positioning of a document relative to a read head in a document processing system. A pressure applying element urges the document against the read head. A speed measuring element rotated by the pressure applying element transmits, to the processing system for use in processing the document, data describing document speed sensed by the pressure applying element at the read head. Distance is eliminated between the read head and speed sensing element, thus eliminating or reducing speed feedback data inaccuracies. Because pressure is applied to the document directly at the read head, read error rates are further reduced.
1. An apparatus adapted for use in a document processing system to control the positioning of a document for readying by a read head, the processing system configured to process the document using data describing the speed of the document during reading, the apparatus comprising:
a pressure applying element configured to urge the document against the read head; and
a speed measuring element configured to be rotated by the pressure applying element and to transmit, to the processing system, data describing the speed of the document sensed by the pressure applying element at the read head.
2. The apparatus of claim 1 wherein the speed measuring and pressure applying elements rotate about the same axis about which also rotates at least one drive element for driving the document past the read head.
3. The apparatus of claim 2 wherein the speed measuring and pressure applying elements rotate independently of the at least one drive element.
4. The apparatus of claim 2 wherein the speed measuring and pressure applying elements rotate with the at least one drive element.
5. The apparatus of claim 1 wherein the pressure applying element is rotated by the moving document.
6. In combination with a document processing system configured to read a document using a read head across which the document is moved while it is read, the document processing system further configured to process the document using data describing the speed of the moving document, a speed sensing element configured to rotate while in contact with the moving document at the read head and thereby to transmit data describing the document speed to the processing system.
7. The combination of claim 6 wherein the speed sensing element comprises a pressure applying element that presses the document at and against the read head while the document is moved across the read head.
8. The combination of claim 7 wherein the pressure applying element is further configured to drive the document across the read head.
9. The combination of claim 7 wherein the pressure applying element is further configured to be driven by the document moving across the read head.
10. The combination of claim 7 wherein the pressure applying element is further configured to drive the speed sensing element.
11. The combination of claim 6 wherein the speed sensing element is further configured to drive the document across the read head while sensing, at the read head, the movement of the document.
12. The combination of claim 6 wherein the speed sensing element is further configured to be driven by the document moving across the read head while the speed sensing element senses, at the read head, the movement of the document.
13. In combination with a document processing system configured to read a document using a read head across which the document is moved while it is read and further configured to utilize data describing the speed of the moving document to control positioning of the moving document, a rotating pressure applying element that presses the document at an against the read head while driving the document across the read head, the pressure applying element further configured to sense, at the read head, the speed of the document and to transmit data describing the speed to the processing system.
14. In combination with a document processing system configured to read a document using a read head across which the document is moved while it is read, the document processing system further configured to process the document using data describing the speed of the moving document, a pressure applying element that presses the document at and against the read head, the pressure applying element further configured to sense the speed of the document at the read head and to transmit data describing the speed to the processing system.
15. The combination of claim 14 wherein the pressure applying element drives the document across the read head.
16. The combination of claim 14 wherein the pressure applying element is driven by the document moving across the read head.
17. A method for positioning a document for reading by a magnetic read head of a document processing system, the document imprinted along an edge with magnetic ink characters, the method comprising the steps of:
pressing the imprinted document edge against the read head as the document is moved past the read head;
sensing the speed of the moving document; and
transmitting data describing the document speed to the processing system for use in controlling the movement of the document, wherein the sensing step is performed at the read head.
18. The method of claim 17 wherein the pressing and sensing steps are performed simultaneously at the read head using a single pressing and sensing element.
19. The method of claim 17 further comprising the step of driving the document past the read head.
20. The method of claim 19 wherein the pressing, sensing and driving steps are performed simultaneously at the read head using a single pressing, sensing and driving element.
21. The method of claim 19 wherein the sensing and driving steps are performed simultaneously at the read head using a single sensing and driving element.