Sheet feeding or delivering – Delivering – With transfer means between conveyor and receiver
Patent
1999-08-18
2000-10-10
Skaggs, H. Grant
Sheet feeding or delivering
Delivering
With transfer means between conveyor and receiver
271902, 271303, B65H 2900
Patent
active
061293490
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to a turn-over apparatus in a guide system for sheets of sheet-shaped material, particularly for individual sheets of paper in a single-sheet printer comprising a paper guide system, whereby the guide system contains shunt elements that make it possible to deliver the sheets to a unit for further processing with the one or the other of its sides facing up as needed. The invention is also directed to a passive shunt unit.
BACKGROUND OF THE INVENTION
Patents Abstracts of Japan M-701 together with JP 62-290 668 A discloses a sheet transport means that has three areas that are connected by transport paths. An active shunt unit at the passive shunt unit make it possible that individual sheets, coming from a first area, are supplied to a third area even directly without being turned over or with the passive shunt unit while being turned over. A similar arrangement is also disclosed by DE 37 27 555 A1.
DE 88 03 496 U1 discloses a printer with a plurality of output channels for recording media. Single sheets are conveyed via deflection elements in the printer. Extruded profiles are arranged close to conveyor drums and have their contours lying relatively close at these drums.
DE 39 14 183 A1 also discloses a conveyor means for sheets of paper, whereby shunt arrangements are employed. The conveyor path is formed by extruded profiles that are arranged close to conveying drums and correspond to their contours.
U.S. Pat. No. 5,014,976 discloses a conveyor device for paper in a copier. The guide element with displaceable curvatures is known in the conveying path for single sheets. The single sheets are guided along these curvatures. The invention is based on the object of offering a reliably working turn-over means and a passive shunt unit with simple structure.
SUMMARY OF THE INVENTION
In order to overcome the disadvantages of the prior art, the present invention provides a triangle-like arrangement composed of a first area or, respectively, source area, of a second area or, respectively, destination area and of a third area or, respectively, turn-over area in which the conveying direction is reversed. In the destination area, one either obtains sheets whose one side points up in that they are supplied directly to the destination area from the source area or, on the other hand, receives sheets whose other side points up in that they are supplied to the destination area from the source area indirectly via the reversing region whereat its conveying direction is reversed. The combination of the triangle arrangement formed by the three areas with the reversing of the conveying direction occurring in the reversing region thus enables the sheets to be turned over. The invention only needs a few moving parts, is therefore simply constructed and can be manufactured with little outlay.
The active shunt unit comprises a driven deflection element that redirects the sheets transported in from the source area into the first path or into the second path depending upon its drive. The entire turn-over process of a sheet is thus achieved by a single, small moveable deflection element, as a result whereof the risk of a paper jam in the turn-over means is greatly reduced.
The passive shunt unit only allows sheets to pass either along the second path from the source area to the diversing area or along the third path from the reversing area to the destination area. What is thereby assured is that the sheets--dependent on the position of the active shunt unit--have only two possibilities for traversing the turn-over means namely directly from the source area to the destination area or indirectly from the source area via the reversing area to the destination, whereby the one or the other side of the sheets faces respectively up in the destination area.
Advantageously, the reversing unit is composed of a pair of oppositely driven drums with a draw-in region between the drums and of a position detector for acquiring the draw-in position of the sheets, whereby the drum pair can be
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Boehmer Georg
Dietl Joseph
Hahn Hans
Heller Bernward
Mugrauer Hubert
Oce Printing Systems GmbH
Skaggs H. Grant
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