[GreenKeys] Spacing problem on a model 15

[Audin Malmin]

Ah, I should have mentioned that the spacing issue on the left margin is
caused by a weak carriage return spring.  We have deliberately loosened it
to encourage the rightward spacing to work better.  If we tighten it up to
make carriage return work better, then the spacing in general works less
well.

The other two stripes, in the middle of the page and on the right margin
(because the drag is near the end of line) the carriage either moves very
slightly to the right or doesn't move at all.  There doesn't seem to be any
backwards movement.  (Also, it is not a case of striking during the
carriage return stroke.)  The carriage seems to drag during those two
portions of the page, though there is no actual drag in the carriage as far
as we can determine.

Is it possible the felt clutch has deteriorated?  Or the spring has
compressed over the years?

On Tue, Nov 1, 2016 at 6:40 PM, drlegendre . <drlegendre at gmail.com> wrote:

> What an interesting pattern. It seems that (on a given line) there are
> high probabilities that it errs in the first few chars, then the few
> middle-line chars, and then again for the final chars. Chars in the two,
> wide "clean" ranges seem almost immune to the errors.
>
> So here's a question - and we'll just focus on the end-of-line errors.
> When it makes these errors, what exactly is going on:
>
>  - Is the carriage failing to regularly advance, that is stalling, and
> hence multi-striking?
>  - Is the carriage advancing correctly, and then returning (partially) on
> the same line to re-strike the given range?
>
> It makes a big difference, as the two modes would seem to be distinct
> failures. One mode might be called "sticky" (stalling) carriage, the other
> might be called "stuttering" (oscillating) carriage.
>
> On Tue, Nov 1, 2016 at 12:58 PM, Audin Malmin <amalmin at okb-1.org> wrote:
>
>> Hello,
>>
>> A friend and I are restoring a 15-KSR.  We got it in a partially
>> disassembled state and have reassembled it enough to get it running.
>> Initially it had a very severe spacing problem; it would only space about
>> half the time (an example of this is the page on the right in this photo):
>>
>> https://goo.gl/photos/589hRU55aBSiNEwF6
>>
>> After disassembling, cleaning, and reinstalling the main shaft and
>> cleaning the vertical spacing shaft (not sure of the term there) it now
>> types as in the page on the left of that photo.
>>
>> But, there is still a spacing problem at two portions of each line.  The
>> carriage assembly slides very smoothly, we have not been able to feel any
>> drag at any point (including those two areas).  The supporting rods and the
>> rack all look straight.  The gears that drive the spacing all seem to be
>> nice and round.  We've played around with different return-spring tensions,
>> up to the point where there isn't enough tension to consistently trip the
>> carriage release return, to no avail.
>>
>> So, does anyone have any suggestions?
>>
>> There are more photos and videos of the thing here:
>>
>> https://goo.gl/photos/mVkLL51odaXKfb4c8
>>
>> Thanks!
>>
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