公开(公告)号：US5803392A

公开(公告)日：1998-09-08

申请号：US745075

申请日：1996-11-07

申请人： David Harold Lancy ,  Frank Castrignano ,  Thomas William Palone

发明人： David Harold Lancy ,  Frank Castrignano ,  Thomas William Palone

IPC分类号： B65H20/18 ,  B65H20/32 ,  B65H23/24 ,  G03B1/00 ,  G11B15/58 ,  B65H20/30

CPC分类号： B65H23/24 ,  B65H20/32 ,  G03B1/00 ,  G11B15/58 ,  B65H2406/311 ,  B65H2408/215

摘要： A vacuum box (38) is provided with recesses (86, 88, 90, 92) on the inner surfaces (74, 76) of its front and/or back walls (40, 42) along at least two of its interior corners (78, 80, 82, 84); so that, the pressures on opposite sides of the incoming and outgoing spans (64.sub.i, 64.sub.o) of the web (50) are substantially equalized at discrete locations along the lengths of the spans, whereby differential pressure applied to the central curved loop (64) between the spans causes the incoming and outgoing spans to remain substantially out of contact with the side walls (40, 42). The side walls (44, 46) may be provided with chamfers (154, 156) at the interior corners or bores (158; 166-172) and ports (160-164; 174-180) to facilitate equalization of the pressure to facilitate equalizing the pressure on opposite sides of webs having a transverse curl toward a centerline of the box. The box may include web keepers (102) to retain the web during thread-up and a removable, sound insulated closure (130). A method of operating such a vacuum box is taught.

摘要翻译： 一个真空箱（38）沿着其前角和/或后壁（40,42）的内表面（74,76）上沿着其至少两个内角（40,42）设置有凹部（86,88,90,92） 78，80，82，84）; 使得幅材（50）的进入和离开跨度（64i，64o）的相对侧上的压力在跨越跨度的长度的离散位置处基本相等，由此施加到中心弯曲环（64）的差压 在跨越之间使得进入和离开跨度保持基本上不与侧壁（40,42）接触。 侧壁（44,46）可以在内角或孔（158; 166-172）和端口（160-164; 174-180）处设置有倒角（154,156），以促进压力的均衡以便于 使具有朝向盒子的中心线的横向卷曲的腹板的相对侧上的压力相等。 盒子可以包括腹板保持器（102），用于在卷线期间保持卷材和可拆卸的隔音封闭件（130）。 教导了这种真空箱的操作方法。