(57) A device for the proper and free stacking of welded bags in a welding machine (11),
wherein the welding machine comprises at least a pair of opposed rolls (13) which
feed a plastic tubular material (12), an upper welding device (15) and a lower welding
device (16) which cooperate to execute the transverse welding of the plastic tubular
material (12), a support (20) for stacking the welded bags (21) as they come out from
the two welding devices (15, 16), said support (20) is positioned downstream of the
welding devices and it carries needles (22) on which the bags (21, 21') are steadily
positioned by means of a small upper press (23), said device comprises a driven transverse
displacement element (25) which acts on the single bag (21') to be welded, and causes
the backing of one of the free front end (27) of the bag, said displacement element
(25) is positioned between the two welding devices (15, 16) and the support (20) and
it acts every second bag, in order to displace one bag from the next one (21, 21').
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