Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1982-11-08
1984-10-23
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29235, 29241, 29450, 29789, 140 3R, 140 925, 245 6, B23P 1904, B23P 1102, B23P 1902, B23P 2100
Patent
active
044779593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for constructing a shackled conveyor belt from premade helical elements alternately with a left handed thread and a right handed thread, wherein the spires of adjacent helical elements are alternately pushed into each other and a connecting wire is fed through the channel formed by the interlaced spires of adjacent helical elements.
Heretofore, the pushing of the helical elements into each other was performed by hand, wherein only the introducing of the connecting wires was performed by means of a mechanical device of the type described in DE-AS No. 30 01 472. The shackled conveyor belts made in this manner usually consist of helical elements with an oval cross section made of plastic monofilament which are connected with each other by plastic connecting wires and are used, for example, as paper machine screens, conveyor belts, etc., wherein their light weight, the good stability and the manufacturability of large belt widths are advantageous.
In the DE-AS No. 30 17 378 which is not a prior publication, there is further described a method of the aforementioned type and a corresponding device, wherein always three or more helical elements are drawn through a wedge-shaped closing slot and are thereby pushed into each other. However, this mode of operation is disadvantageous in that the tension forces serving for the movement of the helical elements result in defective joints, due to the unavoidable minor differences occuring in the closing slot, whereby a plurality of spires of a helical element are pushed immediately adjacent between two spread apart spires of an adjacent helical element. In addition, when using three or a plurality of helical elements, the intermediate ones cannot be accurately fed, so that the connecting wires cannot be properly introduced.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method and a device for manufacturing a shackled conveyor belt of the aforementioned type which permit a mechanical manufacturing of such shackled conveyor belts with simple means, rapidly and substantially free from connecting defects.
For solving this object, the method of the aforementioned type is characterized in accordance with the invention by the features of the claim 6.
Therein, the helical elements are neither assiduously joined by hand, nor pulled through a closing slot, but each two helical elements are pushed toward each other in an angled position by means of an air flow and thereafter are parallely deflected by spreading apart and alternately pushing into each other of the individually facing helical spires, whereby the obtained pair of helical elements is adjoined with one of its two helical elements which are not yet connected by a connecting wire at an acute angle to the end portion of the shackled conveyor belt and is progressively pushed into it. Since neither the individual helical elements, nor the pair of helical elements are moved by a tension force, the individual spires of the helical elements are in tight abutment with each other until the spreading apart deflection, so that during the intermeshing of their spires practically no connection errors occur. Since the two helical elements of the pair of helical elements are pushed forward by an air flow without excerting any tension forces to widen the spire distance and thus the spreading of the spires to be connected of the end positioned helical element of the shackle belt conveyor and the helical element to be inserted therein completely correspond to each other, there are no resulting connection errors during the insertion of the pair of helical elements. Since the helical elements while moving through the curvature for parallel deflection are spread apart on one side only in the area where the spires are pushed into each other and due to their movement by an air flow the stretching and deformations under the influence of tension forces are prevented, generally a quick, substantially interference free operation and defect free s
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Burnecke Manfred
Nyman Swen
Jurgens Maschinenbau GmbH & Co. KG.
Moon Charlie T.
Striker Michael J.
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