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