Apparatus for the release of a product from a continuously circu

Details Apparatus for the release of a product from a continuously circu Apparatus for the release of a product from a continuously circu

1995-11-29

1996-11-05

Bidwell, James R.

Conveyors: power-driven

Conveyor section

Movement of load changed relative to conveyor movement on...

198637, 271311, B65G 4774

Patent

active

055707750

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention pertains to a device for the release of a product from a continuously circulating belt of a belt conveyor or of a double-belt machine, particularly of a double-belt press, in the region of a discharge drum which turns the belt. The drum is mounted on two oppositely positioned lateral bearing cradles and tilts in a horizontal plane in response to a linear movement of at least one of the two bearing cradles. A doctor blade extends perpendicular to the feed direction across the width of the belt and having a cutting edge positioned against the belt surface.
Release of products from a continuously circulating belt of a belt conveyor or on a double-belt machine in the region of a run-out drum with the help of a doctor blade is well known. In order to achieve a uniform and safe release of product from the belt over its entire width, the edge of the doctor blade must lie against the belt surface uniformly over its entire width, i.e. arranged parallel. This leads to problems in belts which can be displaced about a vertical pivoting axis perpendicular to their feed direction in a horizontal plane through a pivoting of the run-out drum since the distance of the edge of the doctor blade to the surface of the belt wound around the run-out drum changes over the width of the belt.
It is the object of the invention to create a device of the above named type, which ensures uniform release of product over its entire width even during a lateral displacement of the belt on the run-out drum.


SUMMARY OF THE INVENTION

This objective is attained by holding the doctor blade in the area of its opposite sides in a guide cradle each rigidly connected to the corresponding run-out drum bearing cradle with a linear guiding means to allow the doctor blade to move linearly in its axial direction, a pivot bearing to align the doctor blade parallel to the respective pivoted position of the rotating axis of the run-out drum, as well as a steering means for an axial movement of the doctor blade according to a lateral displacement of the belt resulting from a pivoted position of the run-out drum. In this way the doctor blade is coupled to the pivoting movement of the run-out drum and thereby to the lateral displacement of the belt. With the lateral sliding and positioning of the doctor blade, it is assured that the edge is always located parallel to the rotating axis of the run-out drum and thereby always in uniform distance to the surface of the belt so that the product is scraped uniformly from the belt as well in a tilted positioning of the run-out drum. The doctor blade thus follows the movement of the run-out drum and the lateral movement of the belt. With the linear freedom of the doctor blade and the steering means, linear balancing is effected in the lateral positioning of the doctor blade relative to the belt so that the doctor blade is always located at an equal height relative to the belt. Thus it is assured that the doctor blade is always aligned concentric to the belt and a uniform release of product over its entire width is achievable.
In a manifestation of the invention, the linear guiding means and the pivot bearing are combined into a compact construction unit. A compact arrangement of the mounting of the doctor blade in the lateral guide cradles results.
In another manifestation of the invention, a roller bearing which guides a bearing shaft of the doctor blade is provided as the linear guide means. In another manifestation, the pivot bearing is arranged coaxially about the roller bearing. Thus the roller bearing for the linear guiding of the doctor blade is arranged within the pivot bearing, whereby a relatively small construction width for the mounting of the doctor blade results.
In another manifestation of the invention the compact construction unit has a pivot roller bearing carrying the bearing shaft of the doctor blade. This pivot roller bearing thus assumes the linear guiding as well as the pivoting movement of the doctor blade. Understandably the bearing shaft of the doc

REFERENCES:
patent: 2697508 (1954-12-01), Watts
patent: 3863755 (1975-02-01), Hartwig
patent: 3912256 (1975-10-01), Nagahara
patent: 4065120 (1977-12-01), Imaizumi et al.
patent: 5161666 (1992-11-01), Pope

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