| 摘要 |
<p>The invention is concerned with a device for sealing together two overlapping edges of a heat sealable packaging sheet forming the outer case for an article of prismatic shape. The device comprises a flexible member (23, 24), e.g. of the chain type, carrying pivotally supported sealers (29) extending thereon crosswise to the article direction of advance and driven through a driving groove (40) effective to control their pivotal movement such that, in a first position, the sealers (29) will contact the two over-lapping edges (43a, 43b) of the packaging sheet and seal them together and in a second position, the sealers (29) will move away from the article.</p> |
