Photocopying – Contact printing – Light boxes
Patent
1991-01-22
1994-11-15
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355260, 101336, 400207, 400249, 347 86, G03G 1500, B41J 2700, B41J 3200
Patent
active
053653122
DESCRIPTION:
BRIEF SUMMARY
Various printing principles are employed in office printing equipment, whether they are text systems or simple printing systems that work in combination with communication terminal equipment. These printing principles, for example, are ink printing, thermal transfer printing, needle printing or type printing with type wheels and electrophotographic printing. What all of these principles have in common is that a printing medium.. contained in reservoirs is applied character-dependent onto a recording medium. The reservoirs--whether they are containers with writing fluid, inked ribbon cassettes or toner containers--are usually interchangeably secured in mounts of the printing equipment. They can be fashioned as throw-away containers that are filled in the factory an that are replaced as a unit after the consumption of the printing medium.
Such reservoirs for ink printer equipment are disclosed, for example, by German Patent 26 10 518 inked ribbon cassettes are disclosed by German Patent 32 14 548.
In order to guarantee a reliable printer operation, it is standard to monitor the supply of printing medium in the reservoirs. This monitoring is particularly required in ink printer equipment wherein the write head is composed of a mosaic write head which a plurality of writing nozzles are arranged. Due to the contraction events occurring in these writing nozzles during the writing mode, such a write head automatically supplies itself with writing fluid from an ink reservoir. When air penetrates into the writing nozzles, then special rinsing procedures are required in order to eliminate the air. Such devices for monitoring the ink supply in ink printing equipment are disclosed, for example, by German Patent 26 17 730.
DE-A1-3 405 164 discloses an arrangement for ink printing equipment wherein an ink reservoir is provided for the acceptance of printer ink; the reservoir can comprise an electronic memory means or a coding in which status data of the printer ink relevant to the printer operation are unerasable stored. These data stored in a ROM or as coding (color marking) can be registered trademarks of the manufacture or data about the type of ink employed.
The data are input once when the ink reservoir is manufactured and are then interrogated upon insertion into the printer. Given lack of coincidence of the data with data stored in a memory, printing is suppressed.
Ink printer equipment continue to be especially sensitive in view of the composition of the ink fluid employed. An inked that is not matched to the ink printing system may lead to a destruction of the printing head. For this reason, it is necessary to prevent used ink reservoirs that are refilled in uncontrolled fashion, for example by outside manufacturers with ink having an unknown composition, from being reused.
The same is also true of inked ribbon cassettes of any type; here, too, an uncontrolled reuse of refilled ink ribbon cassettes with inked ribbons wherein the specification of the inked ribbon is nc, t observed, for example with respect to thickness and layer structure, can lead to disruptions of the printing operation.
Printer or copier equipment working according to the principle of electrophotography are especially sensitive to the composition of the printing medium, a charge image being inked in these equipment with, for example, the assistance of a developer mix composed of carrier particles and toner particles. The inked charge image is transferred onto paper in a transfer printing station and is fixed in a fixing station. Toner that must be supplied from reservoirs of the developer station is constantly consumed when developing. Replaceable toner reservoirs are provided particularly given low-performance electrophotographic printers such as, for example, office printers. When toner having an incorrect composition is then supplied, a considerable deterioration of the printer operation can arise.
In this respect, what is meant below by printing equipment are all types of printing equipment including copier devices wherein a printing medi
REFERENCES:
patent: 4202267 (1980-05-01), Heinzl et al.
patent: 4253103 (1981-02-01), Heinzl et al.
patent: 4491430 (1985-01-01), Kuelzer
patent: 4797018 (1989-01-01), Hofmann et al.
patent: 4851875 (1989-07-01), Tanimoto
Fuchs Thomas
Hillmann Rudiger
Mannesmann AG
Pendegrass Joan H.
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