A winder for a blind system, comprising: a drive member in the form of a chain wheel rotatable in a drive direction and a free direction; a driven member in the form of a crown , to engage a blind cylinder; a transmission mechanism to selectively transmit rotation of the drive member to the driven member , the transmission mechanism including a cam member , an intermediate transmission member formed by a cam drive dog and an intermediate resistor formed by a clutch spring , to provide resistance to rotation of the intermediate transmission member , wherein the intermediate transmission member has: a drive state when the chain wheel is rotated in the drive direction to overcome the resistance of the clutch spring and transmit rotation of the chain wheel through the cam drive dog , coupled thereto via cam member , to the crown when engaged by the cam drive dog , and a free state when the chain wheel is rotated in the free direction, wherein transmission is broken between the chain wheel and the cam drive dog and the clutch spring , with the cam drive dog being disengaged from the cam member and the crown ; and wherein there is no clutch resistance of the clutch spring to rotation of the chain wheel in the free direction when the cam drive dog (250 is in the free state. a drive member in the form of a chain wheel rotatable in a drive direction and a free direction; a driven member in the form of a crown , to engage a blind cylinder; a transmission mechanism to selectively transmit rotation of the drive member to the driven member , the transmission mechanism including a cam member , an intermediate transmission member formed by a cam drive dog and an intermediate resistor formed by a clutch spring , to provide resistance to rotation of the intermediate transmission member , wherein the intermediate transmission member has: a drive state when the chain wheel is rotated in the drive direction to overcome the resistance of the clutch spring and transmit rotation of the chain wheel through the cam drive dog , coupled thereto via cam member , to the crown when engaged by the cam drive dog , and a free state when the chain wheel is rotated in the free direction, wherein transmission is broken between the chain wheel and the cam drive dog and the clutch spring , with the cam drive dog being disengaged from the cam member and the crown ; and wherein there is no clutch resistance of the clutch spring to rotation of the chain wheel in the free direction when the cam drive dog (250 is in the free state. a drive state when the chain wheel is rotated in the drive direction to overcome the resistance of the clutch spring and transmit rotation of the chain wheel through the cam drive dog , coupled thereto via cam member , to the crown when engaged by the cam drive dog , and a free state when the chain wheel is rotated in the free direction, wherein transmission is broken between the chain wheel and the cam drive dog and the clutch spring , with the cam drive dog being disengaged from the cam member and the crown ; and wherein there is no clutch resistance of the clutch spring to rotation of the chain wheel in the free direction when the cam drive dog (250 is in the free state. <EOS>