Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1989-12-11
1992-01-14
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor section
Endless conveyor
198842, B65G 1508
Patent
active
050802216
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a roller belt which is closed in the circumferential direction and has overlapping belt edges. Along a conveying path, the belt is brought through several support roller stations, with the respective support roller stations being provided with several belt support rollers which lie against the outer circumference of the roller belt.
German Offenlegungsschrift (printed, unexamined application) DE 36 20 906 discloses a roller belt which has the features of being closed in the circumferential direction, having overlapping belt edges, and being guided along a conveying path through a plurality of support roller stations which have respective belt support rollers in contact with the outer circumference of the roller belt. Additionally, only one common belt support roller is provided between the transporting and the return feed. It is known that roller belt conveyors do not always maintain their desired geometry which is necessary for optimum arrangement of the belt support rollers. In all prior art arrangements, the respective belt edge of the outwardly overlapping side runs onto the edge of a belt support roller, thus always causing considerable damage to the belt and reducing its service life. If tension cables are additionally worked into the outer belt zones, i.e. its edge region, these tension cables are also affected and finally wear through.
The most varied aids are employed to improve roller belt guidance in order to prevent or impede travelling of the belt. For example, guide and control rollers are employed or belt support rollers are placed at a camber (see, e.g. German Offenlegungsschrift 31 45 899).
However, all of these devices have the drawback that they require additional expenditures and that the resulting additional friction causes premature wear with increased driving power.
SUMMARY OF THE INVENTION
It is thus the object of the invention to improve a roller belt as described above regarding DE 36 20 906 so that it is able to freely move on its path in the circumferential direction within the belt support rollers without running on any edges of the belt support rollers. In dependence on its load and on extraneous influences, such as sun, rain or the like, the belt will then always be able to take on its optimum position and opening along the way is to be avoided.
This is accomplished according to the invention in that the belt support rollers are arranged along the circumference of the roller belt in such a manner that, without contacting one another, they are superposed on one another. This measure makes it possible for the mutually overlapping edges, i.e. the respectively radially outward edges of the roller belt, during rotation in the circumferential direction, to no longer run onto the edges of the next following belt support rollers. Damage to the belt edges is thus avoided, and the service life of the belt is extended. If the belt is twisted, the respective outer edge always moves directly onto the running surface of the next following belt support roller (wedge effect).
Appropriate modifications of the invention are defined in the dependent claims.
The subject matter of the invention can be employed with fixed belt support rollers as well as with support roller garlands even if they are based on a different number of belt support rollers; namely, an odd number (five, seven, nine) for fixed belt support rollers and an even number (preferably six) for support roller garlands.
The belt support rollers are arranged in such a way that each belt support roller is overlapped at one end by the next following belt support roller, with all belt support rollers being arranged, for example, in the clockwise direction or all in the opposite direction, depending on how the overlap of the belt edges is selected. In any case, the overlaps of belt support rollers and belt must be in the same direction. The oblique position of each following belt support roller causes the roller belt to continue to travel in the circumferential direction without g
REFERENCES:
patent: 4723653 (1988-02-01), Engst
Dayoan D. Glenn
O & K Orenstein & Koppel Aktiengesellschaft
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