| 摘要 |
comprises a stepwise-operatable spoke wheel (1) formed with a plurality of outwardly open radial pockets (4) for receiving packs (P) with the relative wrapping material sheet (F) from a feeding station (A), each pocket (4) being provided at the trailing end of its mouth - relative to the direction of rotation of the spoke wheel (1), with radial teeth (214) for retaining in position the trailing flap (L1) of the wrapping material sheet flaps (L1, L2) which are folded on the respective pack by folder means (5, 6). The said folded flaps (L1, L2) are welded together by welding means (7, 8) which are imparted a radially directed reciprocating motion between the one and the successive step of the spoke wheel (1), so that any interference is avoided with the said retaining teeth (214). The said welding means (7, 8) are operated by driving means which consist of main driving means (10, 11) and an auxiliary driving means (18) that is timely set in action only when the operation of the main driving means is discontinued, whereby the function and the integrity of the machine is guaranteed. <IMAGE> |
