| 摘要 |
<p>The invention relates to a device comprising an oven, two series of clips (12) arranged in such a way as to grip the film on the two longitudinal edges thereof, two rails (13) arranged in such a way as to guide the clips (12), and two endless chains (14) arranged in such a way as to drive the clips (12) along the two rails (13). Each chain (14) consists of links (15, 16) alternately of a first type and a second type, that are articulated to each other by means of articulations (17, 18), one articulation in two being used to mount a clip (12). Each rail (13) has a cam (25) protruding from the rail (13) towards the chain (14). The first type of links (15) have a body (35) that presses on the cam (25) in order to deform the chain (14) in such a way as to reduce the chain pitch.</p> |
