Crop threshing or separating – Cleaner – Sieve or grate
Patent
1996-11-22
1998-08-18
Melius, Terry Lee
Crop threshing or separating
Cleaner
Sieve or grate
460 94, A01F 1232
Patent
active
057952230
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a screen device for a harvester-thresher, in particular a harvester-thresher for a test field, comprising at least one frame receiving a cleaning screen, and an adjusting means for adjusting the frame pivotally mounted about a transverse axis in the chassis.
For cleaning the crops, which after the threshing operation are mixed with short straw, chaff and the like, from such admixtures, harvester-threshers are provided with screen devices connected behind a preparation tray for discarding the admixtures in cooperation with the air flow of a cleaning blower. This cleaning effect depends, among other things, on the set angle of the cleaning screens, especially in connection with comparatively short cleaning screens, as this is the case in harvester-threshers for test fields, and by a corresponding adjustment of the inclination of the cleaning screens can therefore be adapted to various types of fruit or to different field densities determining the amount of threshing material. For this purpose it is known to provide inserts with different inclinations for the cleaning screens, which excludes, however, a change of the inclination of the screen when the cleaning screens have been inserted. To overcome this disadvantage it has already been proposed to hold the cleaning screens in frames which are pivotally mounted about a transverse axis in the chassis of the harvester-thresher, and adjacent their end facing away from the swivel axis engage in an arcuate longitudinal guideway with laterally protruding pins, so that the frames can be clamped in their respective angular position with respect to the longitudinal guideways. Such adjusting means are, however, quite complicated to handle, because first of all the clamp connections on both longitudinal sides of the frame must be released, before the inclination of frame and screen can be changed. The new inclination of the screen must then again be secured by means of the clamping means provided on both sides, so that an adjustment of the inclination is often omitted, although the cleaning result could be improved considerably by such adjustment. In this connection it should be considered that every ascent or descent makes an adjustment of the inclination seem desirable, in order to ensure uniform cleaning results.
It is therefore the object of the invention to improve a screen device as described above with simple constructive means, so that an easy to handle adjustment of the inclination of the cleaning screens becomes possible.
This object is solved by the invention in that the adjusting means consists of an actuating shaft parallel to the swivel axis, mounted in the chassis and connected to a swivel drive, which actuating shaft has at least one swivel arm connected with the frame via a connecting rod.
Since there is provided an actuating shaft mounted in the chassis, the frame can be adjusted together with the cleaning screen from one end of the actuating shaft by means of a corresponding swivel drive, in the most simple case a manually operable swivel lever cooperating with a locking means, because the rotary movement of the actuating shaft is converted into a vertical movement of the free end of the frame by means of at least one swivel arm and the connecting rod pivotally mounted between said swivel arm and the frame. The exchangeability of the cleaning screens and, in the case of adjustable screens, the setting thereof are not affected by the adjustment of the inclination of the frame.
Such adjusting means for adjusting the inclination of the frame receiving a cleaning screen can, however, easily be actuated by a remote-controlled motor, which creates particularly simple handling conditions. In this connection, a predetermined control program provides for an automatic adjustment of the inclination in dependence on the kind and condition of the crops through a selection of predetermined parameters. In addition, an automatic adaptation of the screen inclinations to the respective slope of the ground would be possible.
In many cases there
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Aigner Johann
Spiesberger Franz
Melius Terry Lee
Wintersteiger GmbH
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