| 摘要 |
A header includes a generally C-shaped cutter bar supporting the sickle knife assembly across a front edge of the header. A draper assembly is carried behind the cutter bar and includes a pair of rollers at right angles to the beam carrying a continuous draper canvas band around the rollers with the front edge of the canvas underneath the cutter bar. The rollers and a support plate between the rollers for the upper run of the canvas are both recessed relative to the front edge of the canvas to leave a cantilever portion at the front edge of the canvas which projects under the cutter bar to form a seal. The position of the draper canvas on the rollers is guided by a pair of longitudinally extending ribs one adjacent but spaced rearwardly from the front edge and abutting the trailing edge of the cutter bar and the other adjacent but spaced forwardly from the rear edge and abutting a front edge of a rear plate. The ribs are formed integrally with transverse slats. The front rib forms a damming effect reducing the possibility of material sliding over the front edge of the draper. An upper surface of the front rib can be castelated to provide an increased aggressive action tending to pull the crop along the draper.
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