Abstract: The invention relates to a tensioning piece, a conveyor chain, and to a means for opening and closing the tensioning piece.

Abstract: The invention relates to a tensioning piece, a conveyor chain, and to a means for opening and closing the tensioning piece.

Abstract: The invention relates to a packaging machine including a machine frame in addition to a method for the construction and alteration thereof. The packaging machine includes a frame made of transversal (3, 22, 28, 29) and longitudinal elements (2, 12, 13, 15, 16, 18, 19, 25, 33) for receiving and fixing the individual work stations of the packaging machine, whereby the stations are used, for example, for forming, filling, sealing and labelling the packaging. Displacably mounted securing means for the work stations are fixably arranged on the longitudinal elements of the frames. The invention also relates to a method for constructing the type of packaging machine, whereby the frame is made of longitudinal elements (2, 12, 13, 15, 16, 18, 19, 25, 33) which preferably are the same length as the individual work stations, and transversal elements (3, 22, 28, 29) are assembled together and the work stations are consequently suspended, orientated and fixed in the frame.