| 摘要 |
A lead edge feeder wheel used in a carton making machine, having a tread for friction contact with a cardboard during rotation to feed the cardboard into the carton making machine cycle by cycle in conjunction with the operation of wheel grids and a vacuum system, and one or multiple grooves extending along the tread for rendering a visual indication when the tread is worn off, avoiding biasing of the cardboard during feeding.
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