摘要 |
1,230,337. Weaving-loom calliper-type disc brakes. NORTH AMERICAN ROCKWELL CORP. 18 Nov., 1969 [2 Jan., 1969], No. 56262/69. Heading F2E. A mechanism for applying restraint to a yarn being unwound so as to maintain constant tension in the yarn prior to weaving in a loom, including a calliper-type disc brake and a mounting device for supporting the pad assembly, is characterized in that the pad assembly is laterally movable relative to the plane of the disc and pivotably movable about an axis parallel to the axis of the disc. As shown, a friction pad 26, Fig. 3, may be moved towards a disc 22 secured for rotation with a shaft 23, Fig. 1, by hydraulic or pneumatic pressure applied via a hose 28 to a housing 24. An opposing friction pad 27, Fig. 3, is not subject to fluid pressure. The pad-andhousings assembly 21 is secured by screws 30, 31 to a bracket 32, Fig. 2, having an upwardlyangled finger 33, Figs. 1 and 2, which is directed towards, but spaced from, an arm 34. The arm 34 is pivotally supported by a ball-joint 35 from a lug 36 screwed to the side 20 of a loom (not illustrated). The finger 33 and arm 34 are maintained in spaced relation by a flat spring 39 which is fastened to them by pairs of screws 40, 41 respectively. Pairs of reinforcing plates 42, 43, and 44, 45 respectively are provided, Fig. 2. An adjusting screw 47 threaded through an angular bracket 48, Fig. 3, screwed to the side 20 of the loom, bears against the underside of the bracket 32. Since ball-joint 35 is provided, bracket 32 may be raised and lowered to position the pad-and-housing assembly in relation to the disc 22. The bracket 32 may also pivot or move laterally on the end of screw 47 to follow lateral movements or imperfections of disc 22, because the bracket rests loosely on screw 47. The shaft 23 may be positively driven, e.g. by gearing in mesh with the yarn-unwinding apparatus. |