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