rear at half the card web infeed speed v during the forward movement of laying carriage 10 the speed u of upper carriage 30 is also constant during the forward movement of laying carriage 10 the speed w of laying carriage 10 however first undergoes a linear increase during its forward movement until it reaches a speed plateau after which laying carriage 10 is braked and finally changes its direction at the rear reversal point u 1 in the example here at t 1 2 10 s during the normal operation of a conventional fleece layer 2 the two parts of the speed profile of the laying carriage speed w are identical except for their sign during the forward and return movements in other words the average of the absolute values of the speed of laying carriage 10 during its forward movement interval t 1 t 0 is the same as the average of the absolute values of the speed of laying carriage 10 during its return movement interval t 2 t 1 the movement of laying carriage 10 on its forward and return journeys is synchronous expressed as a formula this relationship looks as follows upper carriage 30 continues to travel a short distance after laying carriage 10 has reached its reversal point u 1 but then it too is braked and arrives at its own rear reversal point u 3 shortly after laying carriage 10 reaches its own reversal point whereupon the upper carriage is accelerated in linear.