24/08/2006

A going movement that wont go!

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Click on any image for an enlarged version. Back click to return to the text.

Here is my earliest movement by serial number. No. 00562. I have labelled the movement's main parts and hope this will be clearly legible if you left click on the image. Back-click to return to the text.

Note the absence of a strike motor on the right. Instead of which a large electromagnet is fitted . This is one of only two non-striking clocks in my possession. The electromagnet rocks the small, oval fibre piece which I have labelled actuator. The actuator is fixed to the pivot of a rocking stator hidden out of sight between the movement plates.

As it rocks the actuator carries out two important tasks. It lifts the impulse arm which has the pendulum impulse pallet on the hook-shaped portion at its end. The impulse arm normally rests in the teeth of the 60 tooth fibre ratchet wheel. The impulse pallet pushes on a pin fixed near the top of the torsion spring. The impulse pin faces backwards. The depth of engagement is controlled by the flat metal piece which I have labelled as "Stop". The impulse pin banks on this stop as it rotates to the right. The impulse pallet has a little bump formed on the slope of the hook. As the impulse pallet rises and falls the bump gives the impulse pin a push. This maintains the torsion pendulum in oscillating rotary motion.

The actuator also steps the 60 tooth ratchet wheel forwards. The pinion of 4 leaves rotates the brass wheel immediately below it and eventually drives the clock hands via further wheels and pinions.

On my only other non-striking Telavox the application of a 4.5 Volt battery quickly stops the pendulum from rotating backwards and forwards! My hope is that the earlier movement can be made to run in order to discover the fault with the later example.

I was very disappointed to discover that a Telavox Repair Handbook listed online by the Danish Antiquarian bookshops had been sold or lost! Several decades of clock repair and collecting have not helped to fathom out the reason why this this clock refuses to run! The action seems very sensitive to the position of the Stop. Without a working example it is difficult to judge what the settings should be.


This older movement seems to have been attacked at some time in its history with a blunt screwdriver. Most of the visible screw heads show some damage.

This particular movement has also suffered from the breakdown of the battery lead rubber insulation. This has hardened and crumbled exposing the bare wires to shorting. This seems to have been a problem on some Telavox clocks as they clearly have non-original, much later battery leads. I have now replaced the damaged leads in an attempt to get the older movement to run.
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