Sheet feeding or delivering – Delivering – To receiver for pack of sheets
Reexamination Certificate
1999-09-24
2001-06-26
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Delivering
To receiver for pack of sheets
C271S213000
Reexamination Certificate
active
06250628
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 invention relates to an arrangement for depositing sheets of a recording medium. More specifically, the invention relates to arranging stacks of sheets which are output by an office machine.
2. Background
Office machines, such as printers, copiers or the like, typically output sheets of a recording medium, in general sheets of paper, after a recording has been applied to the medium. As a rule, the recording medium, or sheets, are deposited onto a stack. The sheets are frequently output onto the stack, for example, by driven ejection rollers. If an advancing edge of an ejecting sheet contacts another ejecting sheet already on the stack, the ejecting sheet can catch under friction the uppermost already ejected sheet that is loosely lying on the stack and displace the already ejected sheet on the stack. Thereby the orderly deposition of the stack is disturbed.
During the output and deposition of a single sheet the danger is low of an ejecting sheet catching and displacing an uppermost already ejected sheet disposed on the stack. However, if several sheets are output jointly as a collected set, for example the collected sheets of a print job, then, due to the increased weight and the increased friction caused thereby, the danger of unintentional displacement of the uppermost sheet of the stack increases with the number of the sheets output in the collected set.
Therefore, there exists a need for a device to arrange sheets in a stack where the danger of unintentional displacement of the uppermost sheet of the deposited stack is decreased even if several sheets are output and deposited jointly in gathered form or as a collected set.
SUMMARY OF THE INVENTION
An arrangement for depositing sheets in a stack has a first and a second support at both side edges of the sheets. The first support supports the sheets on the sheet's side edges in order to hold the sheets above the stack. The second support supports the sheets only in a central region of the sheet's side edges. When the first support is pulled away laterally, the first support releases the side edges of the sheets, while the second support still supports the central region of the sheets. Therefore, the front and the rear edge of the sheets can move downwardly. Subsequently, the second support is also pulled away laterally from underneath the side edges such that the gathered sheets can altogether fall onto the stack.
Advantageously, the support of the sheets in their central region by the second support ensures that even du ring the lowering of the sheets onto the stack, no shearing forces are transmitted onto the uppermost sheet already disposed on the stack. Even if relatively large print jobs of, for example, up to 100 sheets are output together by the office machine and are deposited in collected form, a displacement of the uppermost sheet of the previously deposited stack is reliably prevented and an orderly deposition over the entire height of the stack is ensured.
REFERENCES:
patent: 4794859 (1989-01-01), Huseby et al.
patent: 42 23 344 A1 (1993-01-01), None
patent: 0026655 (1991-02-01), None
patent: 7-314813 (1995-05-01), None
patent: 7509635 (1976-11-01), None
BDT Buro-und Datentechnik GmbH & Co. KG
Foley & Lardner
Kleinke Bernard L.
Skaggs H. Grant
LandOfFree
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