| 摘要 |
A repositionable power wrench (10) is disclosed, which includes a housing (11), a motor (12) arranged inside said housing (11), a positioning system (13) arranged to monitor the position of the power wrench (10), and an output shaft (14), which is rotationally connected to the motor and which is telescopically arranged with respect to the housing (11) to allow axial movement of the output shaft (14) with respect to the housing (11) between a fully extended position (Emax) and a fully compressed position (Emln). A resilient member (25) is arranged to urge the output shaft (14) towards the fully extended position (Emax). The output shaft (14) comprises an output end (15) arranged to interact with a fastener (16), wherein a sensor (17) is arranged to monitor a level of extension (E) of the output shaft (14) with respect to the housing (11), such that the position of the output end (15) of the output shaft (14) may be determined irrespective of the level of extension (E) of the output shaft (14). |
