| 摘要 |
The protective door for a knitter has a sliding structure (2) in a partial cylindrical shape, with a first and a fourth position point and a sliding system. A second sliding structure (3) is symmetrical to the first, with a second and fourth position point and a sliding system, with its concave section towards the concave section of the first structure (2) and mounted at the same height as it. An upper curved sliding rail (4), with a guide roller (5), is along the curved surface formed by the two sliding structures (2,3). A lower curved sliding rail (8) is directly under the first rail (4), with a guide roller which is symmetrical to the upper guide roller (5). The upper rail (4) is supported by the lower rail (8), in a rigid construction, for the door sliding mechanism to move horizontally on the rails. One turning unit (6) has one end at the first positioning point of the first sliding structure (2), and extends along the upper sliding rail (4) to slide along it through the guide roller (5). The other end is mounted at the second positioning point at the concave section of the second sliding structure (3). A second turning unit (10) is at the lower sliding rail (8), with one end secured at the third positioning point for the second sliding structure (3), to move along the rail (8) through the guide roller, and its other end is secured to the fourth positioning point at the concave section of the first sliding structure (2). The sliding system mounted to the two sliding structures (2,3) has the shape of a coil (22,24,32,34) with flanged ends. The two curved sliding rails (4,8) have U-shaped steel bars. The two turning units (6,10) are a chain or steel cable with a rolling movement in relation to the guide rollers. The two sliding structures (2,3) are fitted outside the sliding rails (4,8), and the trough of the U-shaped steel bars is outwards to accommodate the chains/cables (6,10). The guide rollers have a vertical shaft, and they are mounted separately at the troughs of the sliding rails (4,8). The electrically-powered gear mechanism has a chain, mounted to the first (2) or second (3) sliding structures. The drive is an electromotor, with a drive shaft for a cogwheel at the chain, to move the sliding structures (2,3).
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