of the clamps 4 5 by the piece of cloth 3 being deployed gradually towards the vacuum boom 8 while simultaneously the latter is conveyed backwards the fore edge 7 could end up with a completely rectilinear course which is shown in fig8 without the vacuum boom having to be modified from a technical point of view in practice the described pattern of movement requires a control unit in which a control program is stored that defines the mutual patterns of movement of the movable parts such control programs may comprise everything from a simple linear pattern of movement to complex patterns of movement that depend on one or more detectors and or manual adjustment options on the apparatus it will be understood that the mutually shifting in time of parts in accordance with the embodiment shown in fig7 and 8 can be combined with the machine parts described in the context of fig4 and 5 and to further describe the many options that are entailed by the invention fig9 13 show further embodiments of the invention by the embodiment shown in fig9 a vacuum boom is provided which is divided into three sections 16 17 18 as will appear from fig1 the section 17 is configured for being movable in the direction of the arrow relative to sections 16 and 18 section 17 may alternatively be configured to be movable as shown by the arrow in fig1 for straightening the curve of the fore edge 7 of the piece of cloth 3 it will be understood that the sections 16 18 shown in fig1 and 11 are u2014 apart from being movable relative to each other u2014 also configured for being moved in unison in order for them.