High-speed printing device having a particle trap arranged in th

Photocopying – Contact printing – Light boxes

Patent

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Details

271258, 355316, G03G 2100

Patent

active

052764940

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a high-speed printing device in which a recording carrier is fed to a printing station via a paper channel.
2. Description of the Related Art
Non-mechanical printers, such as for example laser printers, printers operating with LED combs, magnetic printers or printers operating with ink pressure are generally used as modern high-speed printing devices. These are generally known and have been applied successfully.
In printers operating according to the principle of electrophotography, a latent image is produced on a photoconductive drum with the aid of a light source which is controlled in a character-dependent manner, this image being inked in a developer station by applying toner and then transferred onto a recording carrier in a subsequent transfer station. The image, which is located loosely on the recording carrier and consists of toner, is then fixed with the aid of a fixing device.
The photoconductive drums, used as intermediate carriers, of electrophotographic printers, whether they are made of inorganic or organic material, have a sensitive surface which can be easily scratched. Metal particles, e.g. paper clips, which may be entrained with the recording carrier, can damage the surface of the photoconductive drum, which leads to a fault on the printed image which can no longer be corrected.
With non-mechanical printing devices which operate with ink pressure, whether using a head which is moved line by line or an ink comb, it is also possible that, due to the close spacing required between ink outlet nozzles and recording carrier, a particle which is entrained with the recording carrier can lead to faults in the writing operation or to damage to the ink head or ink comb.
In order to prevent the ingress of particles, it is therefore customary in high-speed printing devices of every kind to cover or encapsulate the paper feed.
However, high-speed printing devices are generally operated in conjunction with EDP (electronic data processing) systems and operated by the same operating personnel. For this reason, the printing devices must be designed in such a way that virtually interruption-free printing is ensured. Thus, after a paper stack is consumed, it must be possible to insert a new stack very quickly without a substantial interruption time. For this reason, it is necessary to design the printing device in an ergonomically optimum fashion; this applies in particular to the insertion and removal of the paper and to the maintenance of the overall system. For this reason, it must be possible to open the printing device wide with the purpose of inserting the recording carrier. Thus, there is a risk of particles such as paper clips or the like getting into the region of the recording carrier during insertion and becoming stuck there, for example, due to electrostatic forces.


SUMMARY OF THE INVENTION

In order to be able to intercept these particles, it is known from the publications JP-A-60-229 038 (Abstract) and Xerox Discl. Journal, Vol. 1, No. 6, page 63 to arrange particle traps which intercept particles magnetically.
It is also known from the publication JP-A-71-144 666 to detect electrically particles which have penetrated into the paper channel with the aid of an electrode and, if required, to switch off the paper transport.
The object of the invention is to provide for printing devices of the type mentioned at the beginning a device which permits particles entrained by the recording carrier to be intercepted so that damage to the printing device does not occur. The device is to be of simple and economical design and, in particular, is not to impede the guidance of paper.
This object is achieved in a high-speed printing device of the type mentioned at the beginning having a particle trap for intercepting particles entrained with the recording carrier arranged in the paper channel in the paper transport direction upstream of the printing area, the particle trap being configured as a mechanical particle trap with a pas

REFERENCES:
patent: 3712733 (1973-01-01), Giaimo, Jr.
patent: 3781107 (1973-12-01), Ruhland
patent: 4593407 (1986-06-01), Konishi et al.
patent: 4692017 (1987-09-01), Maczuszenko et al.
Japanese Patent Abstract (11) 60-70485(A) vol. 9, No. 210 (P-383) [1933] Aug. 28, 1985. "Feeding Method of Trans . . . ".
Japanese Patent Abstract (11) 60-229038(A) vol. 10 No. 93, (P-445) [2150] Apr. 10, 1986. "Copying Machine".
Japanese Patent Abstract (11) 59-79274(A) vol. 8 No. 192 (P-298) [1629] Sep. 4, 1984 "Electrostatic Recording Dev.".
Japanese Patent Abstract (11) 61-144666(A), vol. 10 No. 341 (P-517) [2397] Nov. 18, 1986 "Image Forming Device . . . ".
Xerox Disclosure Journal, "Magnetic Guard Against Debris in Paper Tray", vol. 1, No. 6, Jun. 1976 Carl M. Cavitt.
Xerox Disclosure Bulletin "Magnetic Devices for Capturing Foreign Metallic Objects", vol. 10 No. 6, 11&12 1985 I. F. Palumbo.

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