After the document sheet is thus correctly transported to the designated scanning position, {HEAD ~ a signal} indicative of {TAIL ~ its correct positioning} is transmitted to the copier main body and the standard copying operation is started 
indicative of
After the document sheet is thus correctly transported to the designated scanning position , { HEAD ~ a signal } indicative of { TAIL ~ its correct positioning } is transmitted to the copier main body and the standard copying operation is started
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH