apparatus for the reception, conversion and return of sheets from and to a printer for paper in large format

摘要

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