1972 Olivetti Praxis 48 #5290045

Status: My Collection
Hunter: Hein Reinders (heinemaat)
Created: 03-30-2025 at 12:52PM
Last Edit: 05-16-2025 at 04:14AM

Description Hunter 26 Photos 1 Like  Find on Ebay #AD  Find on Etsy #AD

Description:

This is my second Olivetti. It was a nightmare to clean and repair. In the end, everything worked fine.
Then it developped a fault: after touching a key it types one time, two times or many times the same character. All key suffer from this desease, Just touching a key lightly can cause a machine-gun result. Or not, sometimes it works okay, for once.
I studied the service doc, tried everything to find a clue. I found no cause and no cure.
Anyone?
I am open to advise..... email hreinder1950@gmail.com

Enjoy the photogallery!

Typeface Specimen:

Photos:

connecting a cross member to sheet metal via a connector

fitting a cross member to steel sheet via a connector

again, a connector for fitting a crossmember to a steel sheet. The connector is riveted to the steel sheet at A and B

disassenbling the CR clutch from the actuator lever

the friction plate of the CR clutch, with spring and trustbearing to keep the clutch free when not actuated

the friction plate again, now with the spiral spring that keeps the drawband tight. The knot of the tieband fits in the cavity

the left hand side of the platen assembly, with the variable and the bearing

just a cover

just a cover

the red button that made my second Praxis unique to me for years. It turned out to be a repair.

the assembly of a knob via a leaf spring. Good idea for easy assembly of the cover, no fitting problems. Sadly, the leafspring is broken

To make cleaning easy, the electric parts were taken out of the machine. No soldering required.

unique: aluminium tiewraps

A window uner the hopper shows the carriage position (middle position here)

This is one of many toggle switches in the Praxis, here in the left-right ribbon choice. This is one....

....this is two.

the setcscrew for linear guide pretension. And again, these connectors....

the dwawband for carriage return is fed through the coilspring, and hooked into the line feed lever

My name is 5290045, I am the youngest of two

A: two connectors B: the thin foil that almost fully covers the hole for the vacuum damper. C: the CR clutch plate, actuated at D, supported at E and held down by two springs F. Clutch adjustment set crew. At G: a horseshoe shaped part of a lever, opening or narrowing the horseshoe for adjustment At H: a nylon or teflon (?) tube over the ribbon guide

steampunk with vacuum damper, a bell, and the brake for TAB

many parts in the Praxis are positioned in slots, hooks, annd corners. This is the paper guide hooked in the a frame that opens to free the paper

the toggle spring at the on/off electric switch. One side....

...and the other side

The intermediate drive wheel, which is mounted in a slot to the left side wall via this tiny sheet metal nut. Tension is the drive belt is adjusted by moving the assembly up/down and tightening the bolt. Seems fragile, but it works.

Hunter: Hein Reinders (heinemaat)

Hein Reinders's Typewriter Galleries [ My Collection ] [ My Sightings ]

Status: Typewriter Hunter
Points: 934

As a retired product development engineer, I am fascinated by the design of electro-mechanical products in which parts move, make noise and, preferably, radiate a little heat. Most preferred are products that are operated by keys, like typewriters, accordeons and pianos.
My genetics and statistics on lifetime expectancy suggest that it is time for me to let you know about the fantastic design, product engineering and manuacturing skills of the generation before mine. I salute mr. Munk for the opportunity that he has created for me to show it to the world. Okay, a bit bombastic.
Comments? Email me at hreinder1950@gmail.com