| 摘要 |
<p>A device for the driven winding and unwinding of a cloth (10) comprising: a roller (11) for winding up the cloth (10); a hollow rigid member (21) secured to the free edge of the cloth; a return cable; two spools for winding the return cable (19); two return rollers (16, 18) for the return cable (19) and two guides (14, 15) for the rigid member (21) supporting the cable return rollers and receiving the rising and lowering lengths of the return cable, wherein the whole system is also maintained in tension by a spring (20) interposed in the return cable and placed within the hollow member (21).</p> |
