Sheet feeding or delivering – Delivering – To receiver for pack of sheets
Reexamination Certificate
1999-09-24
2001-09-11
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Delivering
To receiver for pack of sheets
C271S314000
Reexamination Certificate
active
06286829
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 is devices for collecting and aligning a stack of sheets of a recording medium.
2. Background Art
In the case of office machines, for example printers, copiers and the like, it is frequently necessary to collect the sheet-form recording medium to form a stack. This collected stack must be aligned in order to process the stack further, for example in order to clip it, to staple it, or to deposit it with or without offset in an output.
Others have addressed aligning sheets in a stack. For example, DE 2 363 224 discloses moving sheets against an alignment stop on a tray using elastic carrier fingers which are disposed on a rotatably driven shaft. However, in this device, when a next sheet is supplied to the stack, it can displace an uppermost, already deposited sheet. Through frictional engagement such engagement distributes the alignment of the uppermost sheet. Therefore, there exists a need for an improved device such that the alignment of the stack, which has been supplied sheets from a carrier, is not disturbed by subsequently supplied sheets.
SUMMARY OF THE INVENTION
There is therefore provided pressure means which can be placed onto the deposited stack and that can be raised from the stack. The pressure means are controlled such that the pressure means are placed onto the stack after the carrier has aligned the uppermost sheet supplied list of the stack. The pressure means thereby reliably secure the uppermost sheet of the stack alignment with an alignment stop while the next succeeding sheet is being supplied. This next succeeding sheet therefore does not displace the deposited uppermost sheet nor impair the uppermost sheet's aligned position. As soon as the next succeeding sheet is supplied, the pressure means are lifted again from the stack such that the carrier can pull this last supplied sheet toward the alignment stop and can align it on the stack. The pressure means are also lifted from the stack if this stack is moved further, for example in order to align the stack along the edges perpendicular to the alignment stop or in order to further convey the collected stack to further working modules or to an output stage.
REFERENCES:
patent: 3847388 (1974-11-01), Lynch
patent: 5120047 (1992-06-01), Mandel et al.
patent: 5743520 (1998-04-01), Barthold
patent: 196 26 577 A1 (1998-08-01), None
patent: 406127794 A (1994-05-01), None
patent: 403267265 (1994-11-01), None
BDT Buro
Foley & Lardner
Kleinke Bernard L.
Skaggs H. Grant
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