Rotary indicating plate type digital display device

In a rotary plate-type digital display device for displaying the time in hours and minutes in digital form:

• a rotary minute drum;
• a set of minute-indicating plates containing minute time indicia and disposed around the periphery of said minute drum and being pivotable thereon so that angular movement of said minute drum in the forward direction causes said minute-indicating plates to successively pivot and turn over to thereby successively display the minute increment of time;
• a rotary hour drum disposed alongside said minute drum;
• a set of hour-indicating plates containing hour time indicia and disposed around the periphery of said hour drum and being pivotable thereon so that angular movement of said hour drum in the forward direction causes said hour-indicating plates to successively pivot and turn over to thereby successively display the hour increment of time;
• and drive means for continuously rotating said minute drum in the forward direction to effect successive turning over of said minute-indicating plates at one minute intervals and for intermittently rotating said hour drum in the forward direction to effect successive turning over of said hour-indicating plates at one hour intervals, said drive means comprising a rotatable drum shaft having said minute drum rotatably mounted thereon and having said hour drum fixedly mounted thereon, means for rotationally and continuously driving said minute drum about said drum shaft to individually turn over said minute-indicating plates at successive one minute intervals, and means responsive to the turning over of the 59th minute-indicating plate to effect angular movement of said drum shaft to accordingly advance said hour drum one increment in the forward direction to thereby turn over the next hour-indicating plate synchronously with the turning over of said 59th minute-indicating plate.