Advancing material of indeterminate length – Plural material-moving means – And intermediate storage
Patent
1998-09-23
2000-02-22
Mansen, Michael R.
Advancing material of indeterminate length
Plural material-moving means
And intermediate storage
101223, 2261961, 24261521, 399402, B65H 2024, B65H 2332, B41F 504
Patent
active
060270039
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a means for turning and displacing a web of endless recording material, in particular a paper web in an electrographic printer. Furthermore, the invention relates to a means in which the web of endless recording material is only displaced in parallel fashion.
2. Description of the Related Art
Means of this sort are important components of an electrographic printer means for printing on strip-type recording media of various widths. A printing means of this sort is for example specified in International Published application No. WO/94 27193. The printer means has an intermediate carrier that operates electrographically, for example a photoconductor drum, with a usable width corresponding to twice the width of a standard form, e.g. DIN A4 or letter size. The additional components, such as the fixing station, the developer station, the cleaning station, etc., are likewise designed with this usable width.
With this known printer means, different types of operation are possible. In monochromatic duplex operation, the web of endless recording material is turned during its transport through the printer means, so that two web segments result: in a first web segment, the front side of the web lies opposite the transfer printing location of a print unit, whereas in a second web segment the back side of the web is simultaneously imprinted at the same transfer printing location. By means of the use of differently colored color particles in different developer units of the print unit, a two-color duplex operation is also possible. In another type of operation, two-color simplex operation, the web is displaced in parallel fashion during transport in the printer means by at least a web width. The displaced web segments are together led past the transfer printing location, in a side-by-side position. As the web first passes by the transfer printing location, image and text elements are printed with a first color; in the second pass of the web, with a lateral displacement, image and text elements are printed with the second color.
For completeness, we also refer to simplex operation and parallel simplex operation. In the first-named simplex operation, a recording medium is imprinted in a conventional way with up to doubled the width of a DIN A4 page or a page with letter size format. In parallel simplex operation, two webs separated from one another, e.g. respectively having a width according to the DIN A4 or letter size format, are guided side-by-side through the printer means and are imprinted.
In the imprinting of a single web that is displaced in parallel in the printer, or is displaced in parallel and also turned, and again supplied to the transfer printing location of the print unit and imprinted, it is to be ensured that the parallel displacement or parallel displacement with simultaneous turning takes place without disturbance and with high precision. With the use of a means for turning and/or for displacement of a web in a high-performance printer that reaches web transport speeds in the range of 0.1 to 2.5 m/s, measures are to be provided that enable a rapid passage of the web, even with the use of foldable endless material with folds.
From the German patent application 94 112 973.6, a turning means is known for strip-type recording media in which diverting elements are arranged in order to divert the web in the shape of a W. The web is guided tautly through the turning means and is in close contact with the diverting units.
From a further German patent application, P 44 35 756.7, a turning means is known for strip-type recording media whose diverting elements form two turning triangles. The turning triangles are arranged so as to be rotated relative to one another by a spread angle, so that the overall turning means takes up little space.
An object of the invention is to provide a means for displacing, or for displacing and turning, a web, which is of simple construction and ensures disturbance-free operation.
This and other o
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Mansen Michael R.
Oce Printing Systems GmbH
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