Archived posting to the Leica Users Group, 2003/01/23

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Subject: Re: [Leica] M motor drive/winder/RabidWinder
From: John Collier <>
Date: Thu, 23 Jan 2003 17:08:36 -0700

I have not taken apart a Motor-M and obviously they have a switch which 
is engaged only when mounted on a camera. The Winder-M uses the 
mounting latch as a switch. Another alternative for the Motor-M would 
be the spring loaded coupling itself. Try pushing down on that. If not, 
please just send the Motor-M up to me and I will sort it out. Might 
take some time though... :-)

The only communication between the camera and the Winder/Motor is the 
camera's drive coupler which is either free to rotate* or not**

John Collier

* shutter is released and, on most cameras but not all, the release 
button is not depressed

** shutter tensioned

On Thursday, January 23, 2003, at 03:23 PM, Austin Franklin wrote:

> Hi John,
>> The Winder-M has its switch as part of the mounting "zu/auf" latch. 
>> The
>> Winder-M just rotates when turned on.
> Got that...
>> The camera controls when the
>> Winder/Motor works by allowing (or not) the winder/motor coupler
>> rotate. Supposedly the coupler is only free to turn after the shutter
>> has finished it business BUT on many cameras this does not seem to be
>> the case (especially in the slower speeds).
> Well, that really doesn't answer the question...because it would 
> simply turn
> when off the camera.  It obviously has some way to sense that the 
> coupler is
> free to rotate, other than it simply being loose.
>> I suspect that in order to
>> get the Motor-M to work when it is not mounted on a camera, you have 
>> to
>> turn the mounting latch to its latched position and turn the setting
>> switch to 1 or 2. Just a guess mind you...
> It will do the latch switch rotation, but I haven't been able to 
> trigger it
> like the shutter release does...
> Regards,
> Austin
>> John Collier
>> On Wednesday, January 22, 2003, at 02:08 PM, Austin Franklin wrote:
>>> Do you happen to know how the body signals the winder to "wind"?  It
>>> seems
>>> to be through the tension in the little engage pin on the bottom, 
>>> but I
>>> haven't been able to replicate it to get the winder to fire off the
>>> camera.

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