| 摘要 |
PURPOSE:To prevent mishearing in the regular time tone by a warning action prior to the regular time signaling. CONSTITUTION:When the time approaches about 59min and 50sec in reading, with the rotation of an hour cam wheel 18, a rockable lever moves falling to the tip 22a of a cam projection 22 and turns it counterclockwise, releasing a counting lever 34 from the pressure by a pin 30. Consequently, the counting lever 34 turns clockwise having a projection 38 thereof engaging with a rack gear when facing a comb teeth 40. At the same time, released from the pressure rotation by a pin 32 of the lever 20, a warning tone control contact plate 10 gets in contact with a warning tone control contact plate to allow a warning tone device to perform a warning action. When the time is at zero minute and zero second, a 1 minute cam 58 of a 1 minute cam wheel 56 gets in contact with an engaging member 64 of a 1 minute control lever 60 to move the lever 60 clockwise causing a working member 66 to separate from a contact plate 10. The contact plate 10 gets in contact with time signaling control contact plate due to its elasticity to effect a time announcing action. |
