SCREEN PROTECTOR WITH TOP SKIN, DOWN SKIN AND MIDDLE SKIN AND A FIRST CENTER SKIN CONTROL AND ANOTHER SKIN SKIN CONTROL UNIT

摘要

The invention relates to a screen, comprising a first control unit (10) comprising a first drive shaft (12) and at least one first cord spool (30, 32) rotatable with the first drive shaft for winding and unwinding a first lift cord (34) extending between a head rail and a middle rail; a second control unit (20) comprising a second drive shaft (22), and at least one second cord spool (32) rotatable with the second drive shaft for winding and unwinding a second lift cord (36) extending between the head rail and the bottom rail; and a shaft rotation limiting system (100) comprising a threaded shaft (102) arranged on and rotatable in unison with one of the first and the second drive shafts, a coupling element (104) threaded on said threaded shaft, wherein the coupling element is associated with and rotatable in unison with the other drive shaft.