Apparatus for making chains of sacks
AssigneeWindmoller & Holscher
InventorsFritz Achelpohl, Horst Schneider
Life of this patent
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Abstract
In welding apparatus for two layers of travelling plastics film, a plurality of welding tools is moved in pairs along an elongated welding station through which the film layers are passed. The welding tools located on both sides of the layers co-operate with one another and are mounted in tool holders carried by endless chains. The tool holders on one side of the film layers are constructed so that they can be temporarily uncoupled from the associated chain and instead coupled to the respective tool holders on the other side of the layers.
Claims32
Apparatus for applying transfer weld seams to superposed webs of plastics film, preferably for the production of chains of sacks from semi-tubular plastics webs, comprising:
- a plurality of welding tools arranged in pairs;
- welding tool holder means for supporting each pair of welding tools;
- means for guiding said welding tool holder means so that said pairs of welding tools are guided along a planar processing path that is traversed by the webs, enclose the webs between each other, extend transversely of the webs, and act on each other to weld the webs, said means for guiding including pairs of upper and lower endless chains disposed on both sides of the webs, said welding tool holder means including pairs of upper and lower members carrying said welding tools, one of each of said pairs of upper and lower members being connected to and driven by its respective chains, the other of said pairs of upper and lower members being connected to its respective chains in such manner that said other members can be uncoupled and moved with respect to its chains into a position wherein said other member, while being connected to its chains, is coupled to and driven by the other chains.
Dependencies are inferred from the claim text.