English to Japanese Tech/Engineering Mechanics / Mech Engineering 時計の機構

The ***motion work*** is the small 12-to-1 reduction gear train that turns the timepiece's hour hand from the minute hand. It is attached to the going train by the friction coupling of the cannon pinion, so the minute and hour hands can be turned independently to set the timepiece. It is often located on the outside of the movement's front plate, just under the dial.