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FSM Filter step screen Functional principle: The screening grid consists of a fixed step grid rack and a moving step grid rack (shifting grid). The excenter is connected to the two crankshafts of the drive via two connecting rods. The drive mechanism consists of a spur geared motor driving the excenter via a set of chainwheels and a duplex chain. FSM – Filter step screen In March 2008, FSM Frankenberger took over the product range of the HTM Company. The filter step screen is a countercurrent sizing screen. When in operation, the shifting grid performs a circular motion and thus conveys the collected...