PURPOSE: To miniaturize the whole feed device, in the case of forming the feed device for advancing/retreating a feed bar to the rack pinion mechanism type. ;CONSTITUTION: The pinions 15, 16 parallel arranged in the advancing/retreating direction of the feed bar 6 are engaged with a driving gear 14 rotated by a servo motor 9, and the rack member 17 is shifted with the pinions 15, 16 rotating to the same direction. By this shifting, the feed bar 6 is advanced/retreated through a connection pin 19 and a slider 20. Further, the rack member 17 is made to have the length which engages with only one side of the pinion and comes off the engagement with the other side of the pinion at the time of reaching the rack member 17 to the shifting limit.;COPYRIGHT: (C)1994,JPO&Japio
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