[pianotech] Curiously curvaceous repetition lever

[Mark Schecter]

Sorry for the late chime-in, but I sent this fully 24 hours ago, and itonly just now posted. Grrr...

~Mark Schecter

On Sep 24, 2012, at 8:36 PM, Mark Schecter <mark at schecterpiano.com> wrote:

> Finally a good reason to keep the "big" computer: I can see the spring. It hinges in the repetition lever at a pin just forward (toward the player) from the rep lever height screw, at the back end of the lever. Its upper wing terminates above, at a tension adjusting screw accessed from the top of the rep lever. It departs from a slot at the bottom of the rep lever, again just forward of the rep lever height screw, and makes an arc that passes downward and through a slot in the wippen heel, continuing forward until it reaches the bottom of the jack, perhaps there's a little toe there. So when front of the rep lever stops at the drop screw, and the wip continues to push upward, the still-rising rear of the lever tensions the spring, pulling the bottom of the jack backward, thus throwing the top of the jack back forward toward its rest position. Or so I surmise.
> 
> ~Mark Schecter
> 
> On 9/24/12 6:31 PM, Susan Kline wrote:
>> The mice choked on that mildew long since! I can see that the jack
>> trips to the rear instead of the front -- but where is the spring
>> to get it back under? That would have to be acting in the opposite
>> direction from what we expect, too. Pushing toward the front instead
>> of pulling to the rear? Might there be a small coil spring hidden inside
>> the curve, pushing directly against the top part of the jack?
>> 
>> Susan
>> 
>> Dale Erwin wrote:
>>> Terry wrote...I'm trying to understand how escapement occurs with this
>>> wippen.
>>> the mice help stupid !
>>> 
>>> *Dale Erwin R.P.T.
>>> Erwin's Piano Restoration Inc.
>>> **Mason & Hamlin/Steinway/U.S. pianos
>>> www.Erwinspiano.com
>>> Phone: 209-577-8397
>>> *
>>> 
>>> 
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Terry Farrell <mfarrel2 at tampabay.rr.com>
>>> To: pianotech <pianotech at ptg.org>
>>> Sent: Mon, Sep 24, 2012 6:09 pm
>>> Subject: Re: [pianotech] Curiously curvaceous repetition lever
>>> 
>>> I'm trying to understand how escapement occurs with this wippen. It
>>> appears that the top of the rep lever hits the drop screw, pushing the
>>> rep lever down, which in turn trips the jack with the letoff button on
>>> the spoon (attached to the jack) - is that correct?
>>> 
>>> Interesting for sure.  Where were Schroter's made?  Thanks for sharing.
>>> 
>>> Terry Farrell
>>> 
>>> 
>>> On Sep 24, 2012, at 7:31 PM, David Boyce wrote:
>>> 
>>>> Found this action in a 1920s Schroter piano, a make I've not
>>>> encountered before, piano or action.  How undulating!
>>>> 
>>>> Best regards,
>>>> 
>>>> David.
>>>> <Action from Schroter piano.jpg>
>