Apparatus for receiving inverting and returning sheets from and to a printer for large-sized paper

An apparatus for receiving, inverting and returning sheets (62) from and to a printer (1) for large-sized paper, said printer being adapted to be automatically fed a web of paper (60) from a supply of paper (61) through an inlet (6) of said printer, defined by a portion of a paper-supporting plate (7), where said printer further is adapted to print and cut sheets (62) of said web of paper and to guide the printed and cut sheets (62) out of said printer through a separate outlet (13) and into said apparatus, where the apparatus is positioned at the inlet and the outlet of said printer, and is adapted to receive the printed and cut sheets (62) from said outlet and to return said printed and cut sheets to the printer in an inverted state, said apparatus comprising a pivoting first guide means (14) which in one position guides the printed and cut sheets (62) into the apparatus and in a second position guides said printed and cut sheets past said apparatus to be discharged from said printer, wherein the apparatus comprises a first driving roller means (36) and a second guide means(21) pivotally arranged relative to said roller means, where the second guide in a first position guides the printed and cut sheets (62) advanced into the apparatus round the first driving roller means (36) during the initial movement of the printed and cut sheets (62) into the apparatus, and where said second guide means in a second position presses said printed and cut sheets (62) into a driving engagement with the first driving roller means (36) in such a manner that said first driving roller means takes over driving of the printed and cut sheets (62) both during the remaining movement of said printed and cut sheets (62) inside the apparatus as well as during movement of said printed and cut sheets out of said apparatus again and into the printer through the inlet (6) of said printer while the direction of rotation is inverted, and wherein the apparatus comprises a second driving roller means (46) adapted to engage a portion of the web of paper (60) left on the paper-supporting plate (7) after the printed sheet (62) has been cut off and to pull said portion temporarily backwards towards the supply of paper (61) while the printed and cut sheet is being inverted so that said printed and cut sheet (62) can be guided into the printer without colliding with the web of paper (60).