vertically respectively the vertical sides 10 of the rectangle pass through the square transport plane 5 at its four corners the entire clear passage cross section at right angles to the direction of transport of the apparatus 1 is therefore determined in the vertical direction by the vertical length of the rectangle sides projecting upwards above the transport plane 5 and in the horizontal direction by the horizontal distance between the vertical rectangle sides 10 appertaining to the strap guide frame 3 on the one hand and to the strap guide frames 3 39 on the other hand the strap guide frames 3 3 39 are each provided on their side pointing inwards in relation to the clear frame opening with a strap guide channel 11 which is also shown only schematically in fig2 and 3 as is known this strap guide channel 11 is actually constructed in such a manner that when the strap is pulled together it is opened for example with the aid of hinged parts as it also known however it may also be open at the side in which case arrangements are made to eject the strap laterally from the channel after a closed loop has been formed but before it is pulled together below the transport plane 5 there is disposed in the table 6 a device by which the straps 12 can be inserted into the strap guide channels 11 described above by way of example.