Document conveyance system for conveying single documents

Details Document conveyance system for conveying single documents Document conveyance system for conveying single documents

1999-09-24

2001-07-24

Skaggs, H. Grant (Department: 3651)

Sheet feeding or delivering

Delivering

To receiver for pack of sheets

C271S314000, C271S184000

Reexamination Certificate

active

06264193

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED
RESEARCH OR DEVELOPMENT
Not Applicable
REFERENCE TO A “MICROFICHE APPENDIX”
Not Applicable
BACKGROUND OF THE INVENTION
1. Technical Field
The field of the present invention generally relates to a document-processing office machine such as a printer, copier, sorter, document feeding device or a document stacking device. More particularly, the invention relates to an office machine in which single documents of different types can be conveyed.
2. Background Art
In an office machine it is often desirable to transport a document with low force and in which, during the conveyance of the documents to an alignment edge, the documents are not damaged or destroyed. This is desirable even though the document conveyance system continues to act on the document for a specific time after the document has run up to the alignment edge.
Devices for conveying single documents onto document stacks are known. For example, these devices may operate with flexible driving elements such as rubber belts which loosely rest on and drive the documents. Other known devices have rotating fingers comprising flexible materials with a high coefficient of friction which contact and rotatably drive the documents. Yet other known devices have special form wheels with a multiplicity of finger-like structures which are disposed symmetrically at the circumference.
In these known solutions it is disadvantageous that no constant and predetermined conveying speed can be attained since the conveying speed, in particular in the case of solutions involving fingers and form wheels, depends strongly on the axis interval between the driving shaft from the document. It is also a disadvantage that, due to the flexibility of the conveying media, the phase relation between the drive and the document movement is indeterminate.
SUMMARY OF THE INVENTION
It is an object of the present invention to create a document conveyance system in which the documents are conveyable safely and uniformly and at a predetermined speed with a very low conveying force. It is a further object that during the running-up of the documents, in spite of the action of the conveying force on the documents, the documents are not damaged or destroyed.
To meet the objects of the present invention and to overcome the disadvantages of known devices, herein is prescribed a novel document conveyance system. The document conveyance system has inner teeth on a concentric ring. A friction coating is disposed on the outside of the ring. The ring is coupled to a driven toothed wheel having a smaller partial circle diameter than the inner teeth of the outer ring. The ring, together with the friction coating, is set into constant rotation by the driven toothed wheel and the ring. Action of a defined force F, is placed with a force component F
1
onto a document to be conveyed in order to generate a document conveying force F
2
.
The contact point of the friction coating to the document in reference to the direction of conveyance, is always behind the point of engagement of the driving inner toothed wheel. In such a manner the document is pulled. When the document is blocked, the ring is raised above the driving toothed wheel so that the friction force between the friction coating
13
and the document to be conveyed is reduced.


REFERENCES:
patent: 3847388 (1974-11-01), Lynch
patent: 4883265 (1989-11-01), Iida et al.
patent: 5093690 (1992-03-01), Ohno et al.
patent: 5288062 (1994-02-01), Rizzolo et al.
patent: 56-78761 (1981-06-01), None
patent: 360056766A (1985-04-01), None
patent: 0261161 (1989-10-01), None
patent: 0215648 (1990-08-01), None

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