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Cleaning and restoring a ‘clock watch’ movement is a challenging task – and in this instance, once we had opened up the watch, we carefully removed all levers and springs in order to make necessary repairs. This kind of watch is ‘complicated’ and can be operated on demand or strike by itself - the hours and double hit for quarters. This would be repeated on every hour and quarter throughout the day. There are also two switches; one is to turn it to setting which will still strike on each quarter - but this time, omit the hours. There are 19 lever springs, five racks, nine rotating levers, 22 various levers, seven lever stops and 38 screws.
All levers and springs have been removed, ready for cleaning.
Two barrels are required; the larger one is for the repeating sonnerie and the other one is for time.
These comprise all the clock watch mechanism parts.
Under the three-quarter plate are parts for the going train and the clock watch train, with hammers.
The lowest levers and springs are installed, ready for the next section to go over the top.
The hour rack has 12 teeth, and sits on a round wheel with trigger effect. When released, this trigger (or lever) is held away from the ratchet teeth and allows racks to release. These will only rotate as far as the given hour would allow.
The minute cam has four arms. Each arm has a miniature step to spiral down to the base in 14 steps, to represent each minute or each quarter. You can also see four arms cross at the base of the minute cam, which will push the lever over on each quarter. The minute wheel has a stop underneath to prevent the quarters from working at the 12 o’clock position only.
This has 14 teeth and will lift via the finger piece against the given minute. Once lifted, this will connect the hammers and strike the gongs.
On this image, there are two sets of pointed teeth which represent each quarter. They will be lifted at split-second intervals to sound out a double hit with different-sounding tone, because both hammers are used.
This lever sets the clock watch sonnerie setting from full to petite setting.
The lever is in the correct place in the mechanism.
This is an image of the balance wheel with double overcoil, probably made by Houriet. It is used on high-quality watches, and is designed in a spherical shape to produce force, which is distributed closest to the theatrical ideal.
