The undersurface of {HEAD ~ the upper layer feed arm} in {TAIL ~ 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 the upper layer feed arm 38 
in
The undersurface of { HEAD ~ the upper layer feed arm } in { TAIL ~ 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 the upper layer feed arm 38
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH