Sheet feeding or delivering – Delivering – To receiver for pack of sheets
Patent
1987-03-13
1988-08-30
Schacher, Richard A.
Sheet feeding or delivering
Delivering
To receiver for pack of sheets
271171, B65H 3120
Patent
active
047671157
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an accumulator for accumulating paper sheets; more particularly the invention relates to an accumulator which can be adjusted to accommodate a set of sheets having a variable format.
BACKGROUND AND OBJECTS OF THE INVENTION
In accumulators of the prior art an adjustment of the area in which the paper sheets are received to accommodate variable formats is possible only within relatively narrow limits and such adjustment requires complicated means. Furthermore, a reliable, trouble-free operation is not insured to the same degree throughout the range of different paper formats to which the accumulator can be adjusted. In addition, the area in which the paper sheets is received is constituted in accumulators of the prior art by a closed bottom of sheet metal, which sometimes exerts a suction effect on the paper sheet that has been received first so that the paper sheet may not be uniformly fed to the receiving area. Furthermore, the closed bottom of the trough which is provided in the receiving area promotes the build-up of an electrostatic charge which renders the feeding of the paper sheet more difficult. Moreover, in the known accumulators of the prior art in which the receiving area is constituted by a closed bottom, those parts of the equipment which are disposed beneath the bottom are accessible only with difficulty for repair and service work.
Accordingly, it is a primary object of the invention to provide an accumulator which
(a) allows access to those parts of the equipment which are disposed beneath the receiving area of the accumulator,
(b) avoids both a suction and an electrostatic attraction between the receiving surface of the accumulator and the paper sheet to be conveyed, and
(c) permits the surface of the receiving area to be adjusted in a simple manner in a direction parallel to the direction of travel of the paper to accommodate a variable paper format.
SUMMARY OF THE INVENTION
In accordance with the invention, the above objects are achieved by mounting rollers, which support the upper course, or surface, of the conveying belt in a movable carriage, movable in a direction parallel to the direction of conveyance of the paper. The belt loop comprising said upper course, or surface, can thereby be increased or decreased in length, while the conveyor belt extending from the belt loop is trained around deflecting rollers and is guided to a length-compensating loop, where it is tensioned by a compensating roller. The compensating roller is itself mounted on a movable carriage and the arrangement is such that an increase or decrease of the length of the belt loop engaging the paper to be fed will result in a corresponding increase or decrease of the length-compensating loop. Movement of the first carriage to alter the upper course, or surface, of the conveyor belt conveying the paper alters the longitudinal extent of the receiving surface and thus allows the adjustment of the receiving surface to the desired paper format. Furthermore, those parts of the conveying means which are disposed in the plane of the receiving surface are of a particularly efficient structure so that components located therebeneath are readily accessible and can easily be serviced.
The two carriages which support the rollers both to guide the conveyor loop, of which there is at least one, and the length compensating loop, are guided by horizontal tracks provided in the housing of the apparatus and the movement of the two carriages is synchronized by means of wire rope loops, toothed belt loops, or the like. These loops of wire rope, or toothed belt, are trained around rollers affixed to the housing and the rollers functioning to guide the conveyor belt in the length-compensating portion thereof are mounted to the additional carriage by means of a spring-biased mounting so that the conveyor belt, or belts, will always be held taut.
In accordance with one embodiment of the accumulator, the supporting means of the receiving area are comprised by a row of thin, flexible, ten
REFERENCES:
patent: 2785893 (1957-03-01), Ford
patent: 4097042 (1978-06-01), Rozga
Bell & Howell GmbH
Schacher Richard A,.
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