All UH-9000 overlocks are designed for easy-fit-in of the thread trimmers, only a few parts are required for replacement when installing.

Trimming mechanisms are linkaged directly to the machine itself. Trimming motions are driven simultaneously as the sewing machine runs.

All under mentioned thread trimmers should be applied together with one of the following vacuum/venturi devices.
  SV-001 : Vacuum device.(blower motor with drum & hose)
  SV-002 : Vacuum device.(blower motor & waste basket compacted in one iron case)
  CV-08 : Venturi device.(whenever compressed air is available)

SS-033 Side suction type thread trimmer (vertical type).

   The chain-off thread is trimmered by the blades, when it is sucked in at side behind the presser foot.

   For UH9003, UH9004

US-040 Under suction type thread trimmer (horizontal type).

   When the chain-off thread is sucked in horizontally behind the needle, then trimmed by the blades.

  For all UH-9000 series, expect UH9100

US-041 Under suction type thread trimmer
  exclusively for UH-9100