Dorrin K Mace, Horologost

Dorrin K Mace, Horologost
The Clock Man in a pensive moment

Sunday, February 24, 2019

Calendar Clocks

Calendar clocks are a very convenient and useful addition to your home and/or clock collection.  
These clocks can seem imposing to operate, but are really just a simple clock movement with one or more eccentric drives to advance the calendar.

One of the most simple and easy to operate/set is a time only calendar clock.

The calendar hand on this movement is advanced by a pin in an eccentric that is driven off a gear mounted on the hour tube of the movement.  The pin advances a stop cut gear to which the calendar hand is attached.

A more advanced/complex calendar clock is one that shown the date, the day, and the month on a separate dial

The main clock movement runs the calendar mechanism off of an eccentric cog that is driven off of a gear mounted on the hour tube.  This cog lifts a lever along a gentle inclined slop until the end of the incline is reached.  One the end of the incline is reached, the lever drops, advancing the calendar date and day.  The month wheel is advanced on a 31 day cycle through a series of these "drops" of the lever accumulating on the separate calendar mechanism

The questions beg to be asked, what about months that do not have 31 days?
How does one coordinate the day and date?
How is the month advanced to read correctly?
How does one set the time to allow the day and date to change at midnight?

It is not possible to answer these questions with a blanket statement.  Each clock model and manufacture have different methods of setting these variables.
Sorry, there is not a "one size fits all" type answer to this question 

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