| 摘要 |
A wrapping machine having a pre-stretching device (6) for pre-stretching a film web (1) drawn from film roll before its being wrapped around an object, said pre-stretching device (6) comprising a first pre-stretching roller (7) and a second pre-stretching roller (9), which are tractively coupled via power transmission gears (11, 12). A first deflecting pinch roller (13) has been fitted to be pressed against the first pre-stretching roller (7) to form a first nip (14) for the film web passed between the first deflecting pinch roller (13) and the first pre-stretching roller (7). A second deflecting pinch roller (15) has been fitted to be pressed against the second pre-stretching roller (9) to form a second nip (16) for the film web passed between the second deflecting pinch roller (15) and the second pre-stretching roller (9). A lever mechanism (17) moves the first pre-stretching roller (7) between an engagement position (I) and a disengagement position (II), so that the lever mechanism (17) also moves the first deflecting pinch roller (13) apart from the first pre-stretching roller (7) and simultaneously the second deflecting pinch roller (15) apart from the second pre-stretching roller (9) to allow easier thread-in of the film web end.
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