Conveyors: power-driven – Conveyor for changing attitude of item relative to conveyed... – By conveying randomly faced items and turning items to...
Patent
1985-10-28
1987-09-01
Valenza, Joseph E.
Conveyors: power-driven
Conveyor for changing attitude of item relative to conveyed...
By conveying randomly faced items and turning items to...
198447, 198625, 198666, B65G 4714
Patent
active
046902678
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to hoisting and transport equipment and, more particularly, it relates to charging-and-conveying means for removing piece articles from a bulk pile and conveying them to production equipment.
PRIOR ART
In mass production of articles such as bodies of revolution involving changes of their shape and length in the course of processing, it is required that the articles be removed by-the-piece from a bulk pile and, after being arranged in desired position, conveyed to subsequent production step.
By-the-piece removal of articles from a pile is effected by conventional charging means such as pocket,vibration and elevator ones. Said means generally provide for the removal from a pile of articles of simple shape and small length of up to 150 mm with a diameter of up to 50 mm and a weight of up to 200 g.
Pocket-type and vibration charging means suffer from a high position of the hopper, required for feeding articles into charging troughs of production equipment, which makes difficult the charging of the hopper. In addition, a certain amount of articles being handled must be maintained in said prior art means for stable operation of the latter. The need for batch-feeding of articles into the hopper causes further inconvenience in operation.
Elevator charging means are free of the aforelisted disadvantages, however, said latter means fail to provide for the removal of articles of intricate shape from a pile in a strictly defined (oriented) position, this placing considerable limitations on the production capabilities of said means.
Further, in prior art charging means the parameters of devices for removing articles from a pile and of conveying devices depend strictly upon the parameters of articles being charged.
Charging means are known wherein the removal of articles from a pile and their subsequent conveyance are performed by an auger (screw). Such means, however, only provide for the charging of articles of a limited range of standard sizes.
There is known in the art a charging means protected by U.S.S.R. Inventor's Certificate No. 1,006,339, class B 65 G 33/18, published on Mar. 23, 1983. Said prior art means comprises a hopper with a casing and a discharge port, a conveying helical screw and a charging helical screw, said screws having templates with flats positioned thereinside.
The template of the charging screw is oval-shaped in cross-section while the flat of the conveying screw template is made as a concave radius recess facing the template of the charging screw to form a wedge-shaped slot, each one of the turns of the charging screw being positioned above the respective one of the turns of the conveying screw.
Said prior art means suffers from the following limitations of its capabilities.
The means is only capable of charging and conveying articles such as disks, washers, rings, flat-bottom caps and the like featuring a 1/d>1 ratio where 1 is the length and d is the diameter of article. Such articles are stable on the turns of the screw because they are positioned with their flat part on the turns; in so doing, the articles are held on the screw turns owing to the force of friction exceeding the centrifugal force. The sleeve-type articles with the 1/d>1 ratio are less stable in the vertical position and are placed with their cylindrical part on the screw turns, however, due to a small area of contact, the force of friction proves inadequate for holding the article on the screw turn and the centrifugal force throws the article off the turn, which disturbs the operation of the means.
Moreover, in said prior art means the distance between adjacent turns (width of groove) of the charging screw must be less than two thicknesses in the case of plane articles or less than two diameters in the case of articles such as bodies of revolution with a 1/d>1 ratio. Such conditions reduce the probability of capturing piece articles from a pile, with the prior art means being incapable of charging lengthy articles featuring a 1/d>6 ratio because such articles p
REFERENCES:
patent: 1953257 (1934-04-01), Peirce
patent: 2336606 (1943-12-01), Everett
patent: 2966252 (1960-12-01), Meyer
patent: 3791508 (1974-02-01), Osborne et al.
patent: 4526128 (1985-07-01), Sorace et al.
patent: 4527438 (1985-07-01), Fosslein
Gradoboev Vladimir T.
Klimenov Alexandr M.
Melnikov Leonid I.
Sitnikov Alexandr E.
Holmes Jonathan D.
Valenza Joseph E.
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