| 摘要 |
In a bag-making machine, a flattened tubular plastics web is intermittently fed by rollers and the leading end is held taut by air jets from tubes above and below the web. Welding jaws apply base seams for bag sections successively severed from the leading web end by knives. Between the knives and a stacking conveyor for the bag sections there is a supporting plate for the bag sections co-operating with a depressor. Two rows of needles pass alternately through slots in the supporting plate into a raised spiking position. Upon completion of a stack, the needles of one row are moved by a carrier to push the stack closer to the conveyor while the latter is moving and are eventually retracted from the stack while the needles of the other row take their place by moving into the spiking position for the next stack of bag sections. |
