| 摘要 |
IN A TAPE LOADING MECHANISM, A GUIDE GROOVE (23, 24) IS FORMED IN A MAIN PLATE (31) AND A DRUM BASE (32) THAT DEFINES THE PATH OF A MOVABLE TAPE GUIDE (21, 22). EACH OF THE MAIN PLATE (31) AND THE DRUM BASE (32) IS PROVIDED WITH A STEP PORTION IN THE THICKNESS DIRECTION AT A JOINING AREA WHERE THE DRUM BASE (32) IS JOINED TO THE MAIN PLATE (31). THESE STEP PORTIONS OVERLAP WITH EACH OTHER. BY USING THIS JOINING METHODS, A DIE CAST DRUM BASE (32) CAN BE THINNED SO THAT THE DIMENSIONAL ACCURACY IS IMPROVED AND A MOVABLE TAPE GUIDE (21, 22) CAN BE MOVED SMOOTHLY ALONG THE GUIDE GROOVE (23, 24).
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