Typewriting machines – Sheet or web
Patent
1995-09-06
1997-05-13
Hilten, John S.
Typewriting machines
Sheet or web
400679, B41J 1300
Patent
active
056285736
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a document processing device, especially a document printer, with a document issuing section which has a slot-like document issuing aperture and a document support arranged downstream of the latter in the document issuing direction.
Document processing devices of this type are, for example, document reading or printing devices. Within such a device, a document is taken past the processing station by transporting means. As it is transported, it is held securely, for example between pairs of rollers. After its processing, the document is pushed by the transporting device out of the issuing aperture onto the document support, where it can be removed manually by the operator. A device of this type is known for a printer from the reference WO 91/13765 (corresponding to U.S. Pat. Nos. 5,320,437 and 5,364,196).
To achieve a high processing rate, the documents are conveyed at high speed. As a result, when they leave the transporting device they receive such a thrust that they shoot far out of the issuing aperture. Long documents in particular then tend to fall from the document support, because their center of gravity ends up in front of the edge of the housing.
IBM Technical Disclosure Bulletin Vol. 17, No. 5, October 1974, page 1308 discloses a paper-receiving container into which sheets of paper are conveyed at high speed. On leaving a transporting device, the sheets butt against a flap of flexible material which protrudes from above into the transporting path and serves the purpose of absorbing some of the kinetic energy of the sheet of paper.
SUMMARY OF THE INVENTION
It is the object of the invention to prevent issued documents from falling from the document support of a document processing device.
This object is achieved by a document processing device of the present invention, especially a document printer, having a document issuing section which has a slot-like document issuing aperture and a document support section arranged downstream of the latter in the document issuing direction. There is arranged on the document support section, parallel to the document issuing aperture, a slide inhibiting region which inhibits the sliding of a document and projects beyond at least parts of the document support. An upper border of a front wall of a lower housing part adjacent to the document support surface forms part of the document support section. A set off of the document support section is formed on this housing border, the surface of which set off is set back by a distance, preferably 0.5-3 mm, below the remaining document support surface.
The invention is based on the observation that issued documents slide on an air cushion over the document support, so their coefficient of friction with respect to the support surface is low. The application of a slide-inhibiting means to the support surface would also do nothing to change this. Only a raising of the smooth support surface interrupts the carrying layer of air and the documents lands on this surface, with the result that a slide-inhibiting means on the support can become effective. A particularly good braking effect is achieved if the region projecting beyond the support surface has a slide-inhibiting surface. In this case, this region is to have the same coefficient of friction throughout and be parallel to the document issuing aperture, that is to say also parallel to the leading document edge, in order to avoid any canting of the document.
In the case of document processing devices in which documents are fed in and issued through the same aperture, that is to say in which the document entering aperture is identical to the document issuing aperture, documents to be fed in are usually placed initially on the document support and are then pushed into the document entering aperture until they are taken up by the transporting device. A slide-inhibiting region on the document support hinders the manual pushing in of the document. In the case of document processing devices of this type, the slide-inhibiting
REFERENCES:
patent: 5320437 (1994-06-01), Malke et al.
patent: 5364196 (1994-11-01), Baitz et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 5, Oct. 1974, J.A. Craft, "Paper Bin", p. 1308.
Hilten John S.
Nguyen Anthony H.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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