Patent ID: 7738324

Claim:
A display device, comprising: a first display wheel having a denotation portion for showing information about a part of a period and a toothed portion including a plurality of teeth to be driven; a second display wheel having a denotation portion for showing a part of the period other than the part of the period shown by the first display wheel, an opening via which the first display wheel is exposed, and a toothed portion including a plurality of teeth to be driven, and placed overlapping the first display wheel; and a driving finger for driving the first display wheel and the second display wheel to rotate, and further comprising: a display wheel drive control portion for driving the first display wheel and the second display wheel, using the driving finger, every predetermined period of time, to thereby expose the denotation portion on one of the display wheels in a window to thereby display the information, wherein numbers of teeth in the toothed portions of the first display wheel and of the second display wheel are the same, the display wheel drive control portion comprises, engagement state generation means for generating a first engagement state in which the driving finger is engaged with the toothed portion of the first display wheel but not with the toothed portion of the second display wheel when the denotation portion on the first display wheel displays the information about the part of the period in the window through the opening on the second display wheel, and for generating a second engagement state in which the driving finger is engaged with the toothed portion of the second display wheel but not with the toothed portion of the first display wheel when the denotation portion on the second display wheel displays the information about the other period in the window, and engagement state switching means for switching engagement states of the driving finger relative to the toothed portion of the first display wheel and the toothed portion of the second display wheel to thereby mutually switch the first engagement state and the second engagement state, the engagement state generation means is formed by an air swing generation portion for enabling the driving finger to air-swing with respect to one of the display wheels depending on whether or not a toothless portion formed on the toothed portion of at least one of the first display wheel and the second display wheel is located within a drive track of the driving finger, to thereby stop one of the first display wheel and the second display wheel, and drives only other display wheel, and the toothless portion is a thin portion with the tooth partially removed in a thickness direction of the toothed portion.