In the IBM3800 Printing Subsystem, an opening on the drum surface through which the photoconductor is wrapped from the supply spool( inside the drum), around the drum, and back through the opening on the drum surface to the takeup spool.

• 在IBM3800印刷子系统中,鼓表面上开的一个口,光电导体从鼓内供带卷轴穿过这个开口,绕过鼓,返回来又穿过这个开口到取带卷轴。