Harvesters – Standing-grain gatherers – Rotating reel – horizontal axis
Reexamination Certificate
2002-06-20
2004-03-02
Kovács, Aŕpád F (Department: 3671)
Harvesters
Standing-grain gatherers
Rotating reel, horizontal axis
C056S014400, C056S224000
Reexamination Certificate
active
06698175
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority to German Patent Application No. 19938585.8 filed Aug. 18, 1999, which application is herein expressly incorporated by reference.
1. Field of the Invention
The invention relates to an adjustment arrangement for a tine carriers of a reel for a cereal cutting device which carries reaping tines.
2. Background of the Invention
In practical work, two basic types of reels are used on combine-harvesters. One type is a simple paddle reel which only transports the harvesting goods by tineless paddle bars to the machine. A second type is a tine reel. Here additional paddle tubes or paddle bars steel tines or plastic tines are mounted on the machine.
The tine reel has succeeded in combine-harvesters compared to the simple paddle reel since the tine reel can also securely process whirled harvesting goods. In a simple paddle reel, the paddle bars are rigidly mounted on the radial carrier stars. The stars are mounted on the center axle. The center axle is rotatably supported on the side bars above the cutting bar or reception bar of a harvesting machine. The bars in a tine reel, which include tines or tubes, are rotatably supported as tine carriers on the radial carrier stars.
Accordingly, the tines always work in a generally vertical direction to the ground. Thus, in most cases, a control star is used. The control star is arranged radially eccentrically to the axis and therefore also eccentrically to the carrier stars. The control star has a circular control path in the center in which one or more guide rollers roll. The guide rollers are supported by corresponding connection means on the side bars. The tine carriers are provided on the end with small cranks. The crankpins are respectively rotatably supported on the control star. The control star rotates in the same direction and with the same rotational speed as the holding star. Since the control star rotates eccentrically with reference to the holding stars, the crank ends of the tine carrier bars or the tine carrier tubes also rotate once with each reel rotation. Thus, the tines always show in the same direction, which in most cases are directed straight downwards.
Such reel controls have been known for a long time and are still used today in many reels of harvesting machines. Such reels have, however, the decisive disadvantage, that stems wrap around the tine carriers since the reels always rotate in the same direction. This leads, in some harvesting goods, to the tine carriers being completely wound full within a few harvesting meters. Thus, not only is the function hindered, but the total reel is blocked. It is very difficult and very often, very time consuming to loosen the rigidly wound stems manually from the tine carriers.
To avoid this unwanted condition, reels like those illustrated in DE-OS 27 36, 104, were developed. Here the tine carriers only pivot with each reel rotation around roughly 170° in one direction and then pivot back again by the same degree. To achieve this 170° rotation, a complicated lever mechanism is installed. Thus, the tines can not be inexpensively attached to a tine carrier but have to be attached by a more expensive paddle profile. The largest disadvantage is, however, that because of the forward and backward pivoting, the reel tines seen in forward driving direction project forward into a specific area and, when dipping into, for example, standing stems, a hitting movement is carried out. In sensitive harvesting goods, for example rape, the pods are beaten open, before they are transported to the machine.
A further disadvantage is that the tines project into the roadway when the very wide cutting device is stored on a transport wagon in a longitudinal direction and transported in road traffic from one place of usage to the next place of usage. The tine carrier which projects to the front must be detached from its control bars. The tine carrier tubes may be pivoted by hand. Thus, the tines do not project into the roadway. If this is not possible, the tines must be covered with an extensive protection device for such a transport.
To avoid a complicated lever mechanism in the pre-mentioned construction and to be able to use cheaper tubes instead of the expensive profiles as tine carriers, a reel design according to U.S. Pat. No. 5,007,235 or DE-AS 17 57 228 installs curve paths on the reel front sides on the holding bar. Here, rollers, mounted on levers and connected to the tine carrier tubes run on the curve paths. Depending on the path of the radii of the curves the rollers rotate the tine carrier via the lever. However, even here it is difficult, to use a curve, which ensures the pivoting of the tine carrier around more than 170°. Even in these known constructions, the tines always project in a specific rotational area in a driving direction toward the front. Thus, they likewise include the previously described disadvantages.
U.S. Pat. No. 5,007,235 describes an embodiment of a reel which includes the above disadvantages. On each pivotable tine carrier, a short lever is mounted. The lever is displaced via a control roller by a control curve, which has a form diverting from a circular form. The curve extends closely to the tine carrier and at least over a partial area outside the circle of rotation of the tine carrier.
U.S. Pat. No. 2,694,894 shows an adjustment arrangement. Here pivoting levers are connected to a reel pivotably around an axis. The pivoting lever has reaping tines on one end and rollers on the other end. The rollers run on a control curve, which diverts from a circular path. Therefore, depending on the distance of the control curve to an axis of rotation of the reel, the pivoting lever and the reaping tines are pivoted. To achieve large pivoting angles, the control curve has to have, however, at least partially, a large distance to the axis of rotation of the reel. Partially the distance of the control curve to the axis of rotation of the reel is larger than the radius of rotation of the reel and is therefore large.
An ideal tine position is the one where over the 360° reel rotation, the tines work at least over a rotational angle of 180° always in one direction. Thus, the tines are directed generally vertically to the ground. This means, that in the reels, which usually have six tine carriers, that the tines on four tine carriers project in a direction downwards. Accordingly, only the other two tine carriers are in the backwards rotating pivoting area. Heretofore, this ideal tine carrier control has not been achievable with any of the known constructions.
SUMMARY OF THE INVENTION
An object of the invention is to achieve the above pre-described tine control. According to the invention, the object is solved by an adjustment arrangement for the tine carriers of a reel for a cereal cutting device with reaping tines. The reel is rotatable around an axis of rotation and the tine carriers are off-set radially to the axis of rotation. The tine carriers are arranged parallel to the axis of rotation and are adjustable around an adjustment axis which extends parallel to the axis of rotation.
A control element includes a continuous loop first control curve which diverts from a circular path. The reel is rotatably arranged relative to the first control curve. The first control curve encloses the axis of rotation. The reel is arranged between the first control curve and an output element. The output element is connectable to the tine carrier.
A separate adjustment gear, which includes a driving element, is pivotably supportable around a pivoting axis on the reel. The adjustment gear is pivotably adjusted by the first control curve by a driving angle of rotation. Also, the output element is adjusted by an output angle of rotation. A ratio is provided where the output angle of rotation is larger than the driving angle of rotation.
Due to the ratio, the possibility arises that the tine carrier rotates more than 180° forwards and backwards and to select a curve form for the first control curve, which achieves because of the gear
Schumacher Fredrich-Wilhelm
Schumacher Gustav
Schumacher Klaus-Dieter
Gebr. Schumacher Geratebaugesellschaft mbH
Harness & Dickey & Pierce P.L.C.
Kovács Aŕpád F
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