Harvesters – Platform adjustments
Patent
1987-02-25
1989-07-11
Hirsch, Paul J.
Harvesters
Platform adjustments
56 102, A01D 6700
Patent
active
048459313
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for a harvesting machine comprising a cutter header with a cutter-bar in the front end thereof, a reel, a feeding auger, and a feeding elevator.
BACKGROUND ART
There are several demands made on the cutting header of a harvesting machine. The first demand is that the crop be cut at the desired height and be delivered as desired for further treatment in the harvester. Therefore, the cutting header must be adjustable in accordance with often very varied harvesting conditions or other specific demands. As an example may be mentioned the demands made on the header of a whole crop harvester, which include a very low stubble height. Prior art often includes adjustable skids in combination with a spring balancing system to make the header follow the ground contour closely. In this case it is very important that the header is well balanced. In other words the weight of the header must not exceed the carrying ability of the skids in case the skids run into an elevation. Otherwise the header easily digs into the ground, which implies a great risk for extensive damage. In other words, the header must be floating. It has been difficult to unite these demands according to prior art. This is especially true for very large and heavy cutter headers, with a great mass to be accelerated and hence a low mobility.
Prior art also includes the use of mobile headers in combination with sensing runners or other sensing elements underneath the cutter-bar, which detect unevenness of the ground and feed impulses to the hydraulic cylinders of the integrated cutting header. These known systems also include hydraulic balancing. The purpose is to control the set stubble height automatically. The existing systems have not, however, solved the above problem, and have in practice exhibited certain other drawbacks, such as a risk of having the reel run into the cutter-bar when working at a low height if the header is raised quickly as a result of the detectors sensing some elevation of the ground underneath the cutter-bar.
BRIEF DISCLOSURE OF THE INVENTION
The aim of the invention is to offer an improved solution of the above mentioned problems over what has been achieved in the prior art. In order to achieve this purpose the cutting header is divided into a rear table which is pivotable relative to the harvesting machine about a first horizontal axis of rotation by means of first hydraulic cylinders to be set in chosen stationary positions relative to the machine, said rear table comprising such heavy components of the system as the feeding auger (feeding screw) and the feeding elevator, and in front of the rear table a movable feeding apron with the cutter bar provided in the leading end thereof, the sides of the feeding apron being integrated with the front arms of a pair of levers which are hinged on the rear stationary table about a second horizontal axis of rotation. The reel assembly with its reel is carried by hydraulic extension arms which are pivotable about an axis of rotation on the rear table which is stationary in its set positions or on the leading movable apron, said reel assembly being supported by a pair of hydraulically extendable supporting arms provided to cause the movement of rotation of the extension arms. These supporting arms extend between the extension arms and a foot-point on the movable feeding apron, the feeding apron including the weight of the reel assembly which is supported by feeding apron being counter-balanced about the said second axis of rotation by means of hydraulic cylinders connected to the rear arms of the said levers, the said front arms of which are integrated with the size of the feeding apron. Further, ground following members are provided under the movable feeding apron and connected therewith so that the feeding apron will follow the contour of the ground when the machine is advanced and at the same time raise or lower the reel via the supporting arms connected to the movable feeding apron, therethrough avoiding that the reel will
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Bruner Hasse
Persson Lars I.
Hirsch Paul J.
Rippelton N.V.
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