near one end of the spool shaft 109 so that the pinion can be slid on the spool shaft in the axial direction thereof and movingly connected to a handle not shown through a drive gear not shown a clutch mechanism not shown is switched to slide the pinion 111 on the spool shaft 109 in the axial direction thereof to engage or disengage the pinion with or from the notched circular portion 109a of the spool shaft to connect or disconnect the spool shaft to or from the pinion 111 and hence the handle the cup shaped nonmagnetic electroconductive member 112 is secured near the other end of the spool shaft 109 the peripheral portion 112a of the member 112 extends into the recess 106a of the magnet holder 106 from the opening 102c of the side plate 102a the annular magnets 115 and 116 are provided on the shielding yokes 113 and 114 inside and outside the peripheral portion 112a of the member 112 respectively in this embodiment the inner annular magnet 115 is secured while the outer annular magnet 116 can be turned in the circumferential direction thereof together with the shielding yoke 114 a magnet gear 117 is rotatably supported by the magnet holder 106 and engaged with a gear 119 provided on the shaft 118a of the motor 118 secured between both the side frames 102 and 103 an attachment 120 for the annular magnet 116 is engaged with the magnet gear 117 as a result the annular magnet 116 and the shielding yoke 114 are turned together by the.