sliver delivery device and a computer part for maintaining a predetermined quality of a carded sliver wherein there is a predetermined overproduction from a card and or a drawframe relative to a spinning machine the arrangement temporarily decreases production to temporarily compensate for the overproductions the sliver which is produced during the decrease in production may be delivered to a separate can application_number US 74308791 A description fig1 is an efficiency diagram of a number of spinning mill machines in which total or maximum efficiency is represented by a chaindotted line w and the downtimes of the various machines are illustrated in purely diagrammatic form by means of spacer arrows dp dk dst df dr and dsp ______________________________________the letter p denotes blowroom machinesthe letter k denotes cardsthe letter st denotes drawframesthe letter f denotes roving framesthe letter r denotes ring spinning machinesthe letter sp denotes winders______________________________________ the rectangles containing the letters p to sp are purely diagrammatic representations of machine performances or outputs their areas being such that the area of any machine type is less than the area of the immediately previous type except for the area representing the winders which is greater than the area representing the ring spinning machines the aim of the diagram is to visualize the decrease in output as seen from the blowroom machines up to and including the ring spinning machine the differences between the areas being exaggerated so that the differences can be more clearly visualized also.