| 摘要 |
<p>A withdrawal unit (30) is for a band of flexible lay-flat (26) plastic tubing (100) produced conventionally from the blowing head of an extruder. Between lay-flat unit (26) and roller (24) carrying the product to winding, a machine frame (D) pivotally-supports the reversing system, including its return rollers (17, 20) and turning arms (15, 18). Corresponding live rings (1-4) are vertically-spaced, their centres lying on a vertical axis (27) of the unit. These each have reversible rotary drives and swing to various angles. The live rings (1-4) form suns with planet (6, 7, 10, 12) drive wheels around their outer circumferences. Bridging sections carrying the planet wheels are fastened to a common drive bridge (5). The latter forms a swinging frame, in which live rings, return rollers, turning arms and their holders (16, 19) are supported.</p> |
