English to French Tech/Engineering Engineering (general)

Hi

I'm looking for a translation for "carriage clamping mechanism" in the sentence "Raising and Lowering a Carriage Clamping Mechanism on Glass Packaging Machine". I don't have much more context.
I hesitate between "mécanisme de serrage à chariot" and "mécanisme de serrage du chariot" thinking it's just a small element of a machine.

Thank you for your help!