| 摘要 |
The invention relates to a device that enables the size of the apparatus to be reduced and simplifies its manufacture. It comprises U sections 10 which guide the chain 8, being placed between the chain 8 and the plates 1 supporting the sprockets 7. The sections 10 are fitted, in position, into grooves 12 carried by the support plates 1 which also have two concentric ribs in the shape of the circular arc and a frustoconical boss. <IMAGE>
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