[GreenKeys] Teletype 33-ASR Paper Feed Issues

[David Tumey]

I had 4x Model 33 platens restored - all work like new:
J.J. Short & Associates
Link:  Typewriter Platens, Feed Rollers, Bail Rollers and Finger Rollers - Platen, Typewriter Platen, Office Equipment Platen, Typewriter Roller, Typewriter Platen Repair, Typewriter Platen Restoration, Typewriter Feed Roller, Bail Roller, Finger Roller, Ames Supply, Corona, Smith Corona, Hermes, Underwood, IBM Selectric, IBM Wheelwriter, Xerox Memorywriter, LC Smith, Olivetti, Oliver Typewriter, Royal, Blickensderfer, Adler Tippa, Alpina AMC, Electomatic/IBM Power Rollers
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| Typewriter Platens, Feed Rollers, Bail Rollers and Finge...  Typewriter Platens, Feed Rollers, Bail Rollers, Finger Rollers and Power Rollers **** NEW SERVICE ON POWER ROLLERS (click here) ****  |
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You will want 95 Shore A hardness and 1.1150 nominal finished O.D.  If you go with something less than 95 Shore A, you will get over and under scoring on many characters.  I found this out the hard way.
I think it is $65 plus S&H for the restoration.  Linefeed will be perfect if you go this route.
Another possibility is to rejuvenate the rubber material - Wayne Durkee (on the list) has had a lot of success using some chemical/possibly abrasive techniques.  You might query him as well.
GL.
--daveW5DT
 

      From: Rick Bensene <rickb at bensene.com>
 To: greenkeys at mailman.qth.net 
 Sent: Saturday, January 16, 2016 6:11 PM
 Subject: [GreenKeys] Teletype 33-ASR Paper Feed Issues
   
Greetings, all,

Some time ago, I acquired a very nice 33-ASR teletype that was in mostly
working condition.

With useful hints, and a few parts from generous donors on this list, I
was able to get it 100% functioning, and have been enjoying using this
wonderful old terminal on my Altair, PDP 8/e, and hooked up to a more
modern computer running an emulation of HP 2000/Access Timeshared BASIC.

Recently, the machine has been not feeding paper reliably.  I thought at
first that the problem might be in the linefeed mechanism, but as it
turns out, it is working perfectly.  The platen advances one position
reliably every time a linefeed is received (in LINE mode), or when the
LINE FEED key is pressed in LOCAL mode.

It turns out that the paper is actually slipping...like the platen and
roller's grip on the paper is not good enough to pull/push the paper
through the paper path when a linefeed occurs.  I've also been able to
observe this when manually advancing the paper with the knob. 

The platen itself is in nice shape...however, it seems kind of
"polished".  It has a somewhat dense surface.  I seem to remember that
the 33's I used in school had platens that seemed softer, and had a more
textured surface.  The rollers also seem to be somewhat hardened.

I suspect that this probably means that I have to send the platen off
and have it redone.  I have seen reports here from a number of folks who
have sent their platens off for rebuilding, with very good results.  

However, I'm wondering if there is any kind of temporary thing that I
can do to make the platen grip the paper more reliably until I can get a
time when I can tear the thing down and send the platen off for rework.

Also, I foolishly didn't stash the postings to the forum that had
information about the places that folks have sent their platens off to
for rework that have had good results.

Any suggestions on any of this would be most appreciated.

Best to all,
Rick Bensene
The Old Calculator Museum
http://oldcalculatormuseum.com



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