The undersurface of the upper layer feed arm in the center portion thereof is formed with an engaging face 39 and {HEAD ~ an upper layer feed dog} 40 is secured to {TAIL ~ the leading end} of the upper layer feed arm 38 
The undersurface of the upper layer feed arm in the center portion thereof is formed with an engaging face 39 and { HEAD ~ an upper layer feed dog } 40 is secured to { TAIL ~ the leading end } of the upper layer feed arm 38
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH