To provide a nut runner with axial force meter which instantly measures the axial force of a bolt or instantly checks if the axial force is good or bad, dispenses with the necessity of preprocessing of the bolt, and is easy to use and good in durability.
A movable body 2 is connected to a base body 1 to be linearly driven, and a torque generating body 4 is attached to a holder frame 3 provided on the movable body. A cylindrical socket body 8 with an end having an engagement hole 10 to engage a bolt head and the other end being opened is rotatably attached to have an axis core not aligned with a drive shaft 7 of the torque generating body, and the drive shaft and the socket body are connected by a rotation transmission mechanism 9. A probe 100 having an oscillation generating body for vertically oscillating the bolt head with electromagnetic force and an oscillation detecting body for detecting the vertical oscillation and converting it to a signal for outputting, wherein at least the oscillation detecting body is arranged inside the socket body, and the probe is attached to a movable member 11 to linearly move to the movable body.
YANO HIROAKI
TANAKA MINORU
KANEHARA NORIAKI