Abstract: In order to avoid in a tubular bagging machine the disadvantages resulting from the state of the art through a cam-plate control of cross-welding jaws, it is suggested according to the invention, that the control of the movement of the cross-welding jaws occurs in dependency on the contact pressure, the temperature and the needed sealing time, with the drive being able to occur mechanically by means of a toggle-lever drive mechanism.

Abstract: A driving method and system for controlling the operating characteristics of a tubular-bag machine, in which a tubular bag is closed off at the bottom end so as to be fillable with packing material through a fill pipe. An intermittently moved thin foil tube is for this purpose guided vertically between transversely arranged, heated sealing jaws, the opening and closing of which being camcontrolled. The foil movement is adjusted to the opening and closing movement. The drive for effecting the foil movement and the drive for effecting the sealing, separating and welding device are driven by separate motors controlled independently from one another, and are adjusted to one another such that each angular-speed stage can be adjusted independently from the preceding or following stage to the demands of the work cycle at any time during the work cycle. The magnitude of the angular speed can be adjusted as well.

Abstract: A drive chain is trained about drive and driven sprockets and is kept in proper tension by a tensioning device comprising a tensioning member located between the sprockets and extending transversely to the line of centers passing through the axes of rotation of the sprockets, the tensioning member including first and second spaced abutment surfaces facing toward the line of centers and engaging the opposite runs of the drive chain. A part of the tensioning member extends between the first and second abutment surfaces and is provided with an elongated aperture which is received on a pin located on the line of centers of the sprockets whereby as one of the chain runs tightens during operation it will move the tensioning member so as to effect tensioning of the other run.