A CLUTCH-WHEEL DRIVE DEVICE

摘要

A clutch-wheel drive device (1) comprises a drive wheel (4), a driven wheel (6), and an intermediate clutch wheel (8), which co-operates by friction with the drive wheel (4) and with the driven wheel (6) , in which the intermediate wheel (8) is mounted on an arm (18), which can turn on a pin (14), having an axis B distinct from the axis (C) of the clutch wheel (8), and is loaded by a spring (26) so as to push the clutch wheel (8) substantially in a first direction (dl) towards a position of contact with the drive wheel (4) and the driven wheel (6) ; the pin (14) is, in turn, mounted so that it can turn about a further axis (0) so as to enable a displacement of the axis (C) of the clutch wheel (8) in a second direction (d2) different from the first direction (dl) and ensure a correct contact between the clutch wheel (8) and both the drive wheel (4) and the driven wheel (6) even in the presence of wear. The device (1) optionally comprises an actuator (30) for detaching the clutch wheel (8) from the driven wheel (6).