paper injector/extractor

On a typewriter, a control by means of which the paper is fed rapidly round the platen to a predetermined extent and which may also be used to extract the paper rapidly from the machine.; 在打字机中,用来使纸快速绕过压纸卷筒,伸展到预定位置,以及快速地从机器中 取走纸的一种控制装置。