{HEAD ~ The device} which is best seen in FIG 2 is used for effecting {TAIL ~ the vertical shifting} of the upper feed roller 10 
{ HEAD ~ The device } which is best seen in FIG 2 is used for effecting { TAIL ~ the vertical shifting } of the upper feed roller 10
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH