| 摘要 |
PURPOSE:To reduce the oxidation of a switching piece and to expand the life of a contact by extending an alarm setting spring up to a margin space and forming an alarm switch and alarm stopping switch independently. CONSTITUTION:Following the operation of an alarm mechanism, one end 4a of the alarm setting spring 4 constitutes a contact of the alarm switch 3a. The other end 4b of the spring 4 is extended up to a prescribed position to constituted a contact of the riging stopping switch 3b. At the setting of an alarm time, a switch driving means is previously operated and the ringing stopping switch 3b on a circuit substrate 3 is closed by the other end 4b of the spring 4 and then the alarm time is set up by the alarm mechanism. When it is the alarm set time, one end 4a of the spring 4 closes the alarm switch 3a to generate an alarm sound. To stop the alarm the switch 3b on the other end 4b of the spring 4 is opened by the switch driving means to stop the alarm. |
