F. means, operative upon the occurrence of a malfunction in said signal generating means for continuing {TAIL ~ operation} of {HEAD ~ said writer means} until the writer is ready to form images of a page in the predetermined sequence which page has not yet been stored in said buffer memory 
F. means , operative upon the occurrence of a malfunction in said signal generating means for continuing { TAIL ~ operation } of { HEAD ~ said writer means } until the writer is ready to form images of a page in the predetermined sequence which page has not yet been stored in said buffer memory
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH