As illustrated in FIGS 2 4, the pre folder 28 includes a first guide roller 44 which guides the sheet material 21 downwardly and beneath {TAIL ~ the guide roller} and then up {HEAD ~ an incline}, and a second guide roller 45 which is located at a level higher than the first guide roller 44 which guides the sheet material up the incline and over the roller, and then a third guide 46 which is located lower than second guide roller 45 
As illustrated in FIGS 2 4 , the pre folder 28 includes a first guide roller 44 which guides the sheet material 21 downwardly and beneath { TAIL ~ the guide roller } and then up { HEAD ~ an incline } , and a second guide roller 45 which is located at a level higher than the first guide roller 44 which guides the sheet material up the incline and over the roller , and then a third guide 46 which is located lower than second guide roller 45
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH