Harvesters – Standing-grain gatherers – Rotating reel – horizontal axis
Patent
1994-07-14
1995-08-08
Bagnell, David J.
Harvesters
Standing-grain gatherers
Rotating reel, horizontal axis
56130, 56364, A01D 4106, A01D 7518
Patent
active
054388180
DESCRIPTION:
BRIEF SUMMARY
This invention relates to crop strippers for detaching and harvesting standing crops, such grain or flowers or herbage.
Typically such strippers comprise a rotary carrier in the form of a drum which carries axially extending series of teeth which, as the stripper is advanced through the crop, strip desired parts such as grain, leaves or blossom from stems of the crop.
Crop strippers are made in a range of sizes and in one of its aspects the present invention is concerned particularly with multiple drum strippers in which a rotor is divided into at least two carriers or drums arranged coaxially side by side, e.g. in order to increase the overall width of the rotor, and a bearing support separates the adjacent ends of the drums.
When such multiple drum rotors are operated there is a tendency for the plant stems to be caught between two adjacent drums. The bearing support takes the form of a plate fixed to a casing of the stripper, so it is not possible to avoid gaps or clearances in this region and plant stems can become wedged between the drums and the sides of the support, leading to a blockage and even seizure of the rotor. The present invention is concerned with measures which can at least alleviate this problem.
According to one aspect of the present invention, there is provided a crop stripper comprising a rotary carrier having an axially extending series of stripping teeth, supports for the carrier at the ends of the carrier, said support at least at One end of the carrier being flanked by root portions of the stripping teeth most adjacent the support and,comprising a radially outer element which projects radially outwardly of the nearest ends of said flanking tooth root portions, in the region nearer said support the edge profile of said root portions being inclined radially inwardly away from the support whereby crop stems contacting said root portion profiles are deflected away from the support.
More particularly the crop stripper has a rotor, whether with one or more carriers, mounted in side supports at its opposite ends, each said support being flanked by root portions of the stripping teeth most adjacent said support and comprising a radially outer element which projects radially outwardly of the nearest ends of said flanking tooth root portions, in the region nearer said support the edge profile of said root portions being inclined radially inwardly away from the support whereby crop stems contacting said root portion profiles are deflected away from the support.
According to another aspect of the invention, in a crop stripper comprising a rotor having at least two rotary carriers arranged coaxially side by side, said carriers having axially extending series of stripping teeth projecting from them, a support for the rotor extends between said two carriers and is flanked by root portions of the stripping teeth most adjacent each side of the support, said support comprising an element projecting radially outwardly of the nearest ends of said flanking tooth root portions, in the region nearer said support the edge profile of said root portions being inclined radially inwardly away from the support whereby crop stems contacting said root portion profiles are deflected away from the support.
In such a multiple-carrier arrangement said formation of the end root portion profiles can be practised at the ends of each carrier, whether adjacent an intermediate or an end support.
Preferably, said radially outer element of the or each support comprises an outer portion extending axially towards the or each carrier to overlap said adjoining ends of the tooth root portions.
The axial overlap of such a radially outer element can prevent the direct entry of plant stems to the clearances between the support and the carriers. The axial overlap of an element and the inclination of the adjoining tooth root edge profiles can therefore act in a complementary way against the tendency of plant stems to become trapped between the plate and the carriers.
Preferably said support outer element has a radially outer surface
REFERENCES:
patent: 2910819 (1959-11-01), Helliwell
patent: 4587799 (1986-05-01), Thomas et al.
McCredie Paul J.
Shelbourne Keith
Bagnell David J.
Griggs Dennis T.
Shelbourne Reynolds Engineering Ltd.
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