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.; 在打字機中,用來使紙快速繞過壓紙卷筒,伸展到預定位置,以及快速地從機器中 取走紙的一種控制裝置。