Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
1998-07-16
2001-08-14
Valenza, Joseph E. (Department: 3651)
Conveyors: power-driven
Conveyor section
Endless conveyor
Reexamination Certificate
active
06273243
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a device for correcting the run of a belt.
It is an important requirement with respect to the run of a belt that the belt is prevented from running off of the deflecting rollers and of the driving rollers.
Since the belt attempts to always run on the highest point of a roller, crowned rollers are used for the most part which center the belt. However, especially for relatively long belt runs, it cannot be prevented that disturbing influences—e. g. rollers standing at an incline, twisted belts - will attempt to push the belt off of the rollers.
It has been disclosed to use deflecting rollers adjustable with respect to their inclination, so-called adjusting rollers, to compensate for these disturbing influences (DE-Patent 1965023). The axle body can be pivoted around a rotary axis disposed transversely to the roller axis; the pivot position of the axle body is secured by means of an adjusting screw or a threaded pin. For each change of the run of the belt, the inclination of the adjusting roller must be reset manually. This results in an increased maintenance and monitoring outlay.
SUMMARY OF THE INVENTION
Therefore, it is the object of the invention to create an automatic inclination adjustment of adjusting rollers which corrects the off-center run of a belt on the adjusting roller automatically.
This object is accomplished according to the invention in which the torque change at the rotary axis, around which the adjusting roller is pivoted, causes an inclination of the adjusting roller as a result of the off-center run of the belt (changed lever arm) such that a movement component toward the center of the roller is imparted to the belt on the roller.
In another advantageous feature of the invention influences of a changing belt tension are compensated for with the assistance of a reference roller fastened on a pivotable lever.
This reference roller is pushed against the belt via the lever by means of the same spring element. The spring element and lever arms are dimensioned such that, e. g., a reduced belt tension results in a spring force acting on the adjusting roller, which force is reduced at the same ratio owing to the deflection change of the reference roller. Advantageously, the spring force of the spring element can be set. Furthermore, it is advantageous for the adjusting rollers and reference rollers to be configured in a crowned manner.
It also proved to be advantageous to implement the angle of wrap on the adjusting roller in a range from approximately 6° to 25°.
In a further advantageous embodiment of the invention, the device for correcting the run of a belt is inclined by approx. 30° to 60° vis-a-vis the tangential direction of the belt at the adjusting roller on the run-out side of the belt.
The invention is explained in an example in greater detail by way of the figures.
REFERENCES:
patent: 3075633 (1963-01-01), Presti
patent: 4084683 (1978-04-01), Moss
patent: 4901903 (1990-02-01), Blanding
patent: 5052547 (1991-10-01), Doi
patent: 5471289 (1995-11-01), Satoh et al.
patent: 686507A5 (1996-04-01), None
patent: 1965023 (1971-01-01), None
patent: 2062324 (1971-07-01), None
patent: 924677 (1963-05-01), None
patent: 4-185944 (1992-07-01), None
Loose Jochen
Schaal Falk
Siemens Aktiengesellschaft
Spencer George H.
Valenza Joseph E.
Venable
Voorhees Catherine M.
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