| 摘要 |
Tin cans are pre-calibrated prior to entering between the electrode rollers of an automatic seam welder, by a device installed immediately upline of the final calibration and weld station; such a device comprises one or more sets of rollers, each set aligned transversely so as to describe an internal circumference encompassing the can, and at least one such set comprises cylindrical rollers occupying positions that are fixed radially in relation to the cans passing through.
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