Patent ID: 8733222

Claim:
A device for feeding a web substrate to a converting unit, the converting unit for converting the web substrate when stopped, the device comprising: a main drive roller rotating in a first direction on a main shaft, the main drive roller being rotatably mounted on the main shaft, a main electric drive motor rotating the main drive roller, a satellite roller which is configured and operable to oscillate about the main drive roller, from upstream to downstream, and vice versa with respect to the first direction, two lateral levers holding the satellite roller, and mounted on and joined to the main shaft, and at least one secondary electric drive motor which is configured and operable to oscillate the main shaft, the two lateral levers and the satellite roller, the main drive roller and the satellite roller being positioned and configured to engage and maintain the web substrate between them, and configured and operable to change a speed of the web substrate cyclically from a constant speed to a zero speed at an exit region of the satellite roller, and vice versa.