Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1996-06-25
1997-11-11
Mansen, Michael
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
226 39, 226195, 226196, 2426151, 2426153, B65H 2600, B65H 2318, B65H 2304, B65H 5728
Patent
active
056854714
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention generally relates to printers for continuous paper, such as that supplied in a roll or an alternatingly folded stack. More particularly, the present invention relates to a drive and paper positioning system in such a printer.
Electrophotographic printing units which operate with continuous paper, such as are known, for example, from the European Patent Application 0 154 695, can print both reeled papers and stacked goods. They are fed, for paper guidance, with transport caterpillar tracks which engage in a correspondingly perforated auxiliary strip at the edge of the paper (Remaliner).
The printing of fanfold paper with perforations arranged at the side is technically sophisticated and well-proven. However, it is disadvantageous that papers in each case have to be custom made, an additional paper component for the perforated strips has to be paid for at the time of supply and, in addition, this strip as a rule has to be cut away again during post-processing and disposed of. From this, distinctly increased costs arise for the user in connection with the perforated transport strip.
In paper post-processing technology, web guides which are free of transport holes are known which, mostly in conjunction with active control units (rotary frames) and perforated reeled products, transport exactly with very high tensions. This transport is, for example, necessary if the edge strip is removed directly after leaving the printing device,
In the case of data printers processing continuous paper, it is generally necessary to guide the paper web exactly, both with respect to its speed and also with respect to the lateral position, and to synchronize it with the printing unit in such a way that the necessary register accuracy between printed image and paper is achieved.
For this reason, it has previously been common, for electrophotographic printing devices which operate with continuous paper, to use paper webs which have side perforations.
For the reasons described, however, this severely limits the usefulness of the electrophotographic printing device severely.
If, in printing devices of this type, a friction drive is used as paper drive, as is used, for example, in the paper post-processing technology described, there is a risk that, in the use of fanfold paper, the perforation will tear at the transverse perforations of the printed pages. On the other hand, it is necessary to configure the data printers which process continuous paper in such a way that they cope both with perforated and unperforated paper and with perforated and unperforated stacked products.
It is therefore the object of the invention to provide a printing device for processing strip-shaped recording substrates in which printing device the strip-shaped recording substrate is driven with friction. The printing device in this arrangement is intended to be able to process perforated and also unperforated paper. It is a further aim of the invention to provide for the printing device paper guidance for the strip-shaped recording substrate which is suitable for synchronizing both reeled paper and also stacked products with the printing unit to the required accuracy, without transport holes being necessary as guide for this purpose.
SUMMARY OF THE INVENTION
The aforementioned objects are achieved by the present invention which, in an embodiment, provides a printing device, such as an electrographic or magnetographic printing device, for processing a strip-shaped recording substrate, such as the type of substrate supplied in a roll or an alternately-folded stack. This printing device includes a friction drive for transporting the strip-shaped recording substrate and a paper feed device for feeding the strip-shaped recording substrate to the friction drive. The paper feed device has: substrate by forcible guidance on an aligning edge; substrate in a recording substrate transport direction past the web precentering device in such a manner that the strip-shaped recording substrate assumes a predetermined pos
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Mansen Michael
Oce Printing Systems GmbH
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