device for the formation of the cross in segments of tubular transported trasversal mind

摘要

The invention relates to apparatus for spreading open cross-bottoms on conveyed tubular members which are to be further processed to form bags or sacks, the apparatus having two spreader members which rotate sunchronously and symmetrically relative to the plane of the tube ends to be formed and which are driven by way of a non-uniformity drive transmission and which engage into the tube ends for spreading thereof, the degree of non-uniformity of the drive movement produced by the non-uniformity drive transmission and the phase position of the non-uniformity thereof being adjustable.