The device comprises a first shaft (8) disposed parallel with the axis of the feed wheel (5), which also provides the pivot for a rocker (9) fashioned as a yoke and is keyed coaxially to a worm wheel (10, 110) rotating internally of and supported by a housing (11, 111), and a second shaft (12), which incorporates a worm profile in mesh with the wheel (10, 110) and is coupled to a motor (7) in such a manner as to set the first shaft (8) in rotation; drive is transmitted from the first shaft (8) to a parallel third shaft (15), carrying the keyed feed wheel (5), through an idle gear (16) supported in a central position by the yoke (9) and meshing with corresponding gears (8a, 15a) afforded by the two interconnected shafts. The resulting train has the advantage of eliminating any jerkiness that could be transmitted through the three shafts.
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