This is a multi-part message in MIME format. ---------------------- multipart/related attachment ------=_NextPart_001_0032_01C32D14.CD2621D0 Hello Ric. I got this pic from John Delacour. I have much experimented with this action, as it was used in pre-1880 = Bechstein pianos. Walter Pfeiffer refers to it as a Herrburger-Schwander inverted-center = hanging jack linked action (patent about 1850). Indeed, there is lead at the back of the key. Unfortunately, if the springs are very tight, they cause a very = noticeable and objectionnable increase in extra force needed at set-off = time, which can be ennoying at PP blows. I consider those springs just perfect for evening out weight feel at the = key, and rely on the springed shoe behind the jack for improving = repetition. This device is only effective with an unusual low hammer = checking. If hammers check too high, it simply won't come into action. = Also, in the unrestored examples of this action that I saw, hammer = checking distance from string was about 25 mm. And this produces a kind = of "soft landing" touch feel (as would say Antares) that is very = agreable. Even that stop rail behind the hammers rest rail proved to = improve repetition, when well regulated, by providing a shock to the = back of the key, which then rebounds more quickly. Funny : you can, by = choosing appropriate felt density and regulating the heigth of that = rail, voice the extra thump sound that it gives. This appeared very = useful to me, specially in the high trebble, whose sound is then much = evened out (as the thumb in itself is very even) and improved in volume. = Drawback : this tends to cause a "hard landing" touch feel. Strange : even with a 65g DW, the action feels light. But if indeed there is not a repetition performance comparable to that = of a modern action (which, as Stephen Birkett noted, is seldom really = needed in piano litterature), I can tell you that the gain in feel for = control, especially at low levels, is tremendous. No buffers between = your finger and the hammer, and you really can regulate set-off at less = than 1 mm from the strings without any problem. I wouldn't want another = action in my own piano. Best regards And thanks for converting my too huge jpeg. St=E9phane Collin. ----- Original Message -----=20 From: Richard Brekne=20 To: Pianotech=20 Sent: Saturday, June 07, 2003 10:59 AM Subject: Re: Hammer assist spring ? Grin... well I'll be shwagboggled by an Algorthian double winged = dingbat ! Just goes to show its nearly impossible to have an origional = thought in this world :)=20 The attachment was like HUGE !!... for those of you who want a quick = veiw of this interesting action....=20 =20 Thanks St=E9phane.... why dont you give us some more background info = on this picture.. where did you bump into this one for example... and = what is its proper name ?=20 This puppy is actually quite cute !... that spring has a nice = combination affect of pulling the jack back into place as well. It tensions the = jack and the shank in opposite directions so to some degree it would work together with that springed jack check to improve repetition. Tho it = looks like the key would need to have enough back weight to fall back = quickly enough. Neat action idea. ------=_NextPart_001_0032_01C32D14.CD2621D0 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/41/3c/69/b6/attachment.htm ------=_NextPart_001_0032_01C32D14.CD2621D0-- ---------------------- multipart/related attachment A non-text attachment was scrubbed... Name: not available Type: image/jpeg Size: 36158 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/e0/ba/28/bc/attachment.jpe ---------------------- multipart/related attachment--
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