chicane
Explanation:
It might be something more specific, but without more knowledge of what this machine does (some sort of baler, maybe?) it is hard to know.
In any case, the word "chicane" exists in English. It is a narrow and or twisting passage. If you watch motor racing, for instance, you will see a number of Formula One tracks with chicanes, a quick left-right or right-left turn, a sort of mini-S, intended to slow them down for safety reasons or to spice up the race by providing passing opportunities, etc.
In the case of a string or cord, it may serve to prevent a build-up of slack, in much the same way as the "frein".
| xxxBourth
Local time: 20:46
Specializes in field
Native speaker of:  English
PRO pts in category: 802
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The translation workplace 
peer agreement (net): +3