| 摘要 |
<p>An improved transfer apparatus (10) for use in an electrostatographic copier including a dielectric member (26) adapted to carry electrostatically developed marking particle images. The transfer apparatus (10) comprises a cylindrical roller (12) mounted for rotation about its longitudinal axis and located such that its peripheral surface (16) is in operative relation with the dielectric member (26) of the copier. A receiver member is selectively tacked, at least at its lead marginal edge (RLE), on the peripheral surface of the roller (12) by vacuum attraction, such vacuum being effective through ports (48) in the roller. At least one trough (52a, 52b, 54) is formed in the roller substantially aligned with the vacuum ports. Such trough minimizes contact of the tacked lead edge of the receiver sheet to the peripheral surface of the roller, thereby facilitating release of the sheet from the roller at a desired time.</p> |
