| 摘要 |
<p>For the purpose of providing satisfactory, tight welding of overlapping sheet edges and also when passing over uneven surfaces, a press-on roller and two travel rollers are synchronously driven by a drive motor and toothed belt at a traveling, L-shaped machine frame. The travel rollers are laterally offset to the track of the press-on roller, whereby an oblique position of the press-on roller does not occur even in the case of relatively great sheet thicknesses. A heating nozzle running along in front of the press-on roller engages between the sheet edges and forms a pocket, for the lateral closure of which a hold-down is used. The hold-down has a press-on belt rotating in the travel direction and rolling off on the sheet edges, is mounted with vertical play on the frame, and is driven from the press-on roller.</p> |
