| 摘要 |
In a crop roll forming machine having a reversibly rotatable bale forming means there is provided an improved drive means with tensioning means movably affixed to the frame for cooperative interaction with the drive means and the bale forming means to selectively cause the bale forming means to cease being driven in a first direction and cause it to be driven in an opposing second direction when the tensioning means is moved to a predetermined position so that a completed crop roll is ejected rearwardly from the machine onto the ground.
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