be used in this embodiment for receiving the supply lines 35 36 0093 fig8 and 10 show a further preferred embodiment of the invention as known from the embodiment in accordance with fig1 to 3 the releasably arranged sliver opening unit 4 is displaceably connected with the stationary spinning box housing 2 by means of a first linear guide 3 however here a second linear guide 70 is arranged in the area of the connecting bracket 30 of the first linear guide 3 which is essentially comprised of relatively short guide bolts 63 fixed in place in the connecting bracket 30 as well as guide bores 69 cut into the connecting body 71 of the sliver opening unit 4 in the area of their free ends the guide bolts 63 each have an arresting groove 66 which in the installed state is engaged by one of the locking levers 64 arranged on the connecting body 71 of the sliver opening unit 4 the locking levers 64 which are shown in greater detail in fig1 and 11 in particular are seated for limited rotatability around a pivot shaft 68 in vertical guide slots 65 of the connecting body 71 in addition the arresting levers 64 are acted upon for example by a spring element 67 in a manner such that in the installed state they automatically snap into the arresting grooves 66 at the guide bolts 63 and thereby fix the sliver opening unit 4.