| 摘要 |
<p>1504717 Seaming non-metallic sheet material; welding press MITSUBISHI KASEI KOGYO KK 9 Sept 1975 [12 Sept 1974] 37038/75 Headings B5K and B5N A welding apparatus comprises a pair of opposed pressing plates 1, means 5 to move the plates 1 towards and away from each other to receive therebetween superposed articles to be welded together, a heated platen 9 to heat the article surfaces to be welded together, means 11, 12 for reciprocating the platen 9 between an operative position between the plates 1 and an inoperative position outside of the plates 1, a holding mechanism 2 to position the articles at the opposing surfaces of respective plates 1, and a spacer 3 to define predetermined gaps between the platen 9 and the plates 1. As shown, the plates 1 are movable vertically by oil pressure cylinder 5 and are guided by rods 6 extending through bushings 21 on beams 20. Each plate 1 is provided with suction discs 2, connected to a suction pump 7, and spacers 3. Each disc 2 is contained in a recess 24, Fig. 2, in the plate 1 and is biased by a spring 22 to normally project slightly beyond the inner surface of the plate 1. Upon the application of suction through a pipe 23 to the centre of the disc 2, after engagement with an article, the disc is forced into the recess 24. Spacers 3 are mounted adjustably on either one or both plates 1 or on the platen 9. The platen 9 has a fluorinated resin surface coating, has an internal electric heater, and is reciprocable on wheels 10 along rails 13 by an endless chain 12 driven by a motor 11. In operation, the height of the spacers 3 is adjusted to be smaller than the thickness of one article to predetermine the thickness of the surface layer of the article to be melted. The articles are inserted between the separated plates 1, the cylinders 5 are operated to clamp the articles between the plates 1 and suction is applied to the discs 2. The plates and the articles are separated and the platen 9 is inserted between the articles. The plates 1 are again brought together and the articles are pressed against the platen 9 to fuse the desired areas until the platen 9 engages the spacers 3. The plates 1 are separated, the platen 9 is retracted and the plates 1 are re-closed to press the articles together to effect welding. The articles may comprise two flat, moulded sheets each having hollow spaced legs, the ends of corresponding legs of the sheets being welded together to form a pallet.</p> |
