[GreenKeys] 14 Ribbon help needed.

[John Nagle]

On 7/13/24 11:18, greenkeys-request at mailman.qth.net wrote:
> Message: 18
> Date: Sat, 13 Jul 2024 09:37:03 -0400
> From: Tom Hunter<tomhenryhunter at gmail.com>
> To:GreenKeys at mailman.qth.net
> Subject: [GreenKeys] 14 Ribbon help needed.
> Message-ID:
> 	<CAJK86919giB6t+5x2NyZO11pTKxav7DKwwpLqqFsuF9G9n7dBw at mail.gmail.com>
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> 
> I am playing with my 14 reperf again. when the ribbon is running from left
> to right, the left spool is so tight I can not tum it with my fingers and
> the typebars cannot press the ribbon against the tape.
> 
> The 14 Description manual is no help. Can anyone tell what provides back
> tension on the ribbon spools and How do I reduce it?
> 
> The ribbon setup is similar to a 15. The 15 description is no help either.

     The ribbon advance mechanism there is a bit complicated.

Basic checks:

     First, does the ribbon have an eyelet to push the ribbon
reversing arm? The ribbon has to have an eyelet near each end,
and those eyelets should always be near the spool, not past the
ribbon reversing arm.

     Second, to test the ribbon reversing mechanism, turn the
motor by hand counterclockwise from the fan end and watch the
mechanism cycle. If you press on one of the ribbon reversing arms
(Figure 37) while cranking the motor, the ribbon feed shaft
(figs. 41-42) should slide sideways, shifting gears to disengage
one ribbon spool shaft and engage the other one. See the bevel
gears at the end of each ribbon spool shaft? Only one of those
sets should be engaged at a time.

    The ribbon feed shaft can only slide sideways during one part
of the machine cycle. If you hand crank the motor, you can find the
brief part of the cycle where it's unlocked. Check that it moves
freely. If it's stuck, clean and lubricate the parts involved
moving it sideways. See Fig. 42. Machines oiled with lubricants
which evaporate and leave crud behind (like WD-40) will have
this problem. The Teletype spec specifies a whale oil blend, but
synthetic 0W-20 motor oil works fine.

If the mechanism is undamaged, this is probably just a lubrication
problem.

References:

    http://aetherltd.com/public/model14manuals/127B-Iss3.pdf
    See "Ribbon reverse arm shaft adjustments", etc.,
    p. 21 in original.

				John Nagle