| 摘要 |
An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a transport device for conveying the workpiece longitudinally in a transport direction along a path, a lower welding tool along the path beneath the upper tool, and a heater for at least one of the tools. A conveyor belt extending along the path downstream of the tools has a horizontal conveyor surface positioned to receive the workpiece after same is conveyed by the transport device past the welding tools. A holddown roller rotatable about a horizontal axis is displaceable vertically above the conveyor surface. A drive connected to one of the welding tools and to the transport device, conveyor belt, and holddown roller generally synchronously vertically and codirectionally displaces the one welding tool and the holddown element and synchronously horizontally and codirectionally displaces the conveyor surface and holddown element. Thus the stack on the conveyor belt is pinched and engaged between the holddown element and conveyor surface. Thus any relative movement of the workpieces on the conveyor is impossible. During the critical phase when the conveyor is advanced the entire stack is positively engaged at the downstream end so there will be no slippage of the workpieces relative to one another. |
