Motorizing Hunter Douglas blinds with "ratchet"-style string

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Old 02-02-20, 09:27 AM
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Question Motorizing Hunter Douglas blinds with "ratchet"-style string

I'm thinking of motorizing my Hunter Douglas blinds with a string that's ratcheted.
What I mean by that is the string is not bidirectional.
You pull the string 90' downward to raise the blinds, and pull the string 45' downward to lower the blinds.

I'm wondering if this open/close mechanism of my blinds should still be amenable to DIY motorization.
 
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Old 02-02-20, 11:15 AM
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Powering the blind up and down will be the easy part. If you remove the latch/ratchet mechanism that grips the cord then you can rely on the motor to do the raising, lowering and holding it in position. Wrapping the cord a couple times around a drum, capstan style will create friction and give the cord better grip on the drum.

The hard part will be putting controls in place to stop the blind in the up and down positions. You don't want the motor grinding away once the blind has reaches the end of it's travel.
 
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