A cutting machine for trimming window covering work pieces is disclosed. In an illustrative embodiment equipment running time is subdivided into a valuable operating time component and a plurality of performance loss time components. Tension springs are connected on one end to the ribbons and on the other end to the support structure. Because the edging attachment is coupled to the mowing deck, adjustment of the edging blade height is also effected using the foot control. The fuel flows both around and through the check valve as it flows through the outlet passage. Said other management code is produced on the basis of identification data particular to the first card and also particular to the second card.