Device for changing the moving direction of a flat rectangular s

Details Device for changing the moving direction of a flat rectangular s Device for changing the moving direction of a flat rectangular s

1999-01-13

2000-08-08

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

By means to change direction of sheet travel

19845706, 1984642, 19837008, 27126501, 271184, 271198, 271282, B65H 500

Patent

active

060989785

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to an apparatus for changing the direction of motion of flat, rectangular sheet material such as documents or bank notes.
2. Discussion of Related Art
Such apparatuses generally have a first transport path for transport of arriving the sheet material. In this first transport path the sheets are transported singly with a distance between every two sheets. Further, such apparatuses have a second transport path for further transport of the sheet material which is disposed at right angles to the first transport path. For drawing off a sheet from the first transport path to the second transport path a draw-off device is provided which draws off the sheet material without a change of position in a draw-off area.
Such apparatuses are known for example from DE-A-42 43 986, EP-A-0 622 316 and EP-A-0 505 340. In the draw-off devices described therein the sheet material is first grasped by a draw-off body and a corresponding mating roller and drawn off from the first transport path. The sheet material is then delivered to the second transport path.
A disadvantage of these apparatuses is that the draw-off bodies used are exposed to high wear due to the deceleration of the sheet material in the first transport path and the acceleration of the sheet material perpendicular to the transport direction of the first transport path, so that the draw-off bodies must frequently be replaced. Further, the delivery of the sheet material to the second transport path by the draw-off body constitutes a potential source of disturbance since jams can frequently occur in the intake to the second transport path in particular upon delivery of lower-quality sheet material.


SUMMARY OF THE INVENTION

The problem of the invention is to provide an apparatus for changing the direction of motion of flat, rectangular sheet material which works with high service life despite wear and delivers the sheet material reliably from one transport system to the other even at high transport speeds.
The essence of the invention is that the draw-off device draws off the sheet material directly by the transport medium of the second transport path. Since the length of the transport medium of the second transport path is generally much longer than the circumference of the draw-off body of known apparatuses, the wear arising from deceleration and acceleration of the sheet material is distributed much better. It is therefore necessary to replace the transport medium due to wear much less often than the draw-off bodies in known apparatuses. Further, the sheet material is firmly gripped directly by the transport medium of the second transport path and can be transported reliably without any other delivery point, so that the problems of delivery to the second transport path arising in known apparatuses do not arise.
In a preferred embodiment of the apparatus the transport media of the second transport path are each deflected about a draw-off wheel. The draw-off wheels are disposed on levers which are rotatable about a pivot. An actuator is used to move the levers from an inoperative position to a draw-off position.
In order to minimize the torques acting on the levers, the pivot is located in each case on the intersecting point of the median line between load strand and empty strand of the transport medium of the second transport path in the inoperative position and the median line between load strand and empty strand of the transport medium of the second transport path in the draw-off position.
Further, the first transport path can be divided into two partial paths into which the sheet material can be directed accordingly by a switch device. At least one draw-off device is located in each partial path. The drawn off sheet material is then transported further in corresponding partial paths of the second transport path. A suitable arrangement of the partial paths can e.g. increase the throughput of the apparatus. Alternatively, the sheet material can be turned about one or two axes.


DESC

REFERENCES:
patent: 3703951 (1972-11-01), Brockmuller
patent: 4235434 (1980-11-01), Muller
patent: 4431104 (1984-02-01), Orlowski et al.
patent: 5074544 (1991-12-01), Kulpa et al.
patent: 5333851 (1994-08-01), Kulpa
patent: 5358234 (1994-10-01), Boriani et al.
patent: 5433430 (1995-07-01), Straessler et al.
patent: 5655643 (1997-08-01), Bonnet
Patent Abstract of Japan, Bond 7, Nt. 197, M-239 Abstract of JP 58-95064 A (Nippon Denki K.K.) Jun. 6, 1983.

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