Device for automatically bypassing trellis stakes or fruit hedge stakes, in particular for pre-pruning machines comprising a working head comprising two rotating vertical drive shafts (1A, 1B), on which are mounted two stacks of cutting disks teeth (4A, 4B) and an opening wheel (5A, 5B), these stacks being able to occupy a close position in which they interpenetrate or a spacing position in which the cutting discs of each stack are separated from the cutting discs of the other stack, characterized in that each opening wheel (5A, 5B) is mounted on its drive shaft (1A, 1B) via a coupled gear reducer (20) tree audit. The invention also relates to agricultural machines provided with such a device.
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