Sheet feeding or delivering – Delivering – To receiver for pack of sheets
Reexamination Certificate
1999-06-01
2001-06-05
Jillions, John M. (Department: 3653)
Sheet feeding or delivering
Delivering
To receiver for pack of sheets
Reexamination Certificate
active
06241239
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to a device for outputting single sheets from a printer or a copier, comprising a driven roller pair in whose conveying nip the respective single sheet is transported and which is deflected from an approximately vertically proceeding conveying path into an approximately horizontal conveying path, and comprising a deposit compartment for the deposit of the conveyed single sheets.
Such a device is utilized, for example, in high-performance printers, whereby the deposit compartment is a specimen compartment in which, for example, individual sheet specimens of a test printing are deposited. Traditional apparatus have shown that their operating dependability is limited and a paper jam in the output region occurs disproportionately often.
JP-A-57 072561 discloses a device for outputting single sheets from a printer or copier. The single sheets are conveyed forward by a roller pair. A rejector unit that suppresses a further-conveying of the respective single sheet on the circumferential surface of this roller is arranged at the roller.
U.S. Pat. No. 4,511,238 discloses a device in an electrophotographically working copier. This device successively supplies single sheets to further units. A sensor, for example a mechanical sensor, acquires the presence of a single sheet between conveyor rollers.
U.S. Pat. No. 4,570,801 discloses a device for conveying single sheets. An optoelectronic sensor checks the conveyed single sheets. When a jam occurs, for example due to single sheets sliding on top of one another, this jam is reported to a higher-ranking control.
JP-A-58 089557 discloses a paper output unit of a copier machine where single sheets are conducted between rollers. Each single sheet passes a guide that assures that the single sheet is supplied to a deposit compartment.
SUMMARY OF THE INVENTION
An object of the invention is to specify a device for the output of single sheets that works operationally dependably and avoids a paper jam.
This object is achieved by the initially cited device in that a rejection unit is arranged in the proximity of the circumferential surface of the lower roller of the roller pair, this rejection unit suppressing a continued conveying of the respective single sheet on the circumferential surface of the lower roller.
The invention is based on a perception that it is precisely the lower roller of the roller pair that is critical, since single sheets are still held at the generated surface due to electrostatic forces or the force of gravity in the transition between vertical conveying and horizontal conveying, and can be drawn into the structural necessary gap between lower roller and deposit compartment, whereby they can cause a paper jam. According to the invention a rejection or separating element is arranged in the proximity of the circumferential surface of the lower roller. This rejection or separating element lifts the respective single sheet off from the generated surface of the lower roller, and adhesion of the single sheet is no longer possible. The single sheet is compelled to pass through the discharge gap between roller pair and deposit compartment. The present invention thus works operationally dependably and reliably.
The generated surface of the lower roller preferably has at least one channel-shaped recess into which the rejection or separating element engages. When this rejection unit is designed as a flashing, it has front, finger-like sections engaging into the recess or into a plurality of recesses on the generated surface of the lower roller. As a result of this arrangement, the single sheet is reliably lifted off from the generated surface of the lower roller, as a result whereof a wrapping of the lower roller is made impossible.
According to the invention, a discharge brush which preferably electrically discharges that side of the single sheet lying up is arranged in the conveying path following the roller pair. The discharge brush is thus arranged at a position such that the single sheet is no longer in frictional contact with conveyor elements. The electrostatic discharge of the sheet can thus no longer be reversed by such conveyor elements. The single sheets deposited in the deposit compartment thus do not adhere due to electrostatic effects and can be easily individually separated from one another.
In the invention, an edge sensor with the assistance of which a determination can be made as to whether prescribed intervals are adhered to between single sheets following one another is arranged preceding the roller pair as viewed in a conveying direction. The structure of such an edge sensor is known in and of itself For example, the edge sensor can be designed as a light barrier that indicates the lack of a sheet within the light barrier. When conveyed single sheets slide on top of one another in the conveying path, then the edge sensor can no longer detect a starting edge or, respectively, ending edge of single sheets. Such a condition is then interpreted as a paper jam. The operating dependability of the apparatus is further enhanced by this technique.
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Patent Abstracts of Japan—56183630—May 27, 1983.
Oberhoffner Gerhard
Ulber Armin
Jillions John M.
Oce Printing Systems GmbH
Schiff & Hardin & Waite
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