| 摘要 |
The apparatus has at least one tension roller (5) which engages on the web of packaging material and which can be driven via a switchable friction coupling. For the purpose of an especially smooth switch-on, even over very long operating periods, and for the purpose of saving maintenance work, the friction coupling consists essentially of belt pulleys (22, 24) and of a belt (23) looping loosely or tautly round these in a controlled manner. <IMAGE>
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