| 摘要 |
An electronic tape measure (10) comprises a flexible, fabric tape (11) frictionally engaging an optical encoder shaft (44) which rotates as the tape is withdrawn or retracted, and for desired measurement positions the encoder output is supplied to a computer. The tape (11) has an end bar (14) and a friction grip saddle (16) to define respective end positions. For measuring a circumferential dimension, the bar (14) fits in hooks (21) of the saddle (16). A recess (33) is provided at the exterior of housing (32); when the tape (11) is withdrawn from the housing so that the bar (14) and saddle (16) just fit in the recess, the known length of tape enables a calibration measurement to be undertaken.
|
