| 摘要 |
A rack (25,26) and pinion (28) gear mechanism, operated by the radial motion of two symmetrical spring loaded bob-weights, varies the rotational position of the cutter control shaft (40) relative to the body of the tool. The tool has one or more cutters (12) which are carried in a rigid shank (3). Radial protrusion (43) of the cutting edge (13) from the shank is governed by the position of an eccentric pin (42) fixed to the control shaft and is adjusted by varying the rotational speed of the tool. The control shaft is driven through a coupling (48). The bob-weights slide radially on guide pins (19,20). The cutters can be replaced by moving the control shaft axially on its drive pins (33,34) against a spring (39), to disengage the eccentric pin, allowing the cutter to slide out of its guide (10). |
