| 摘要 |
The alarms are connected via the central control electrical unit to a time calculator or clock. By a key impulses can be transmitted to the central unit which partly emits impulses for starting the time calculation, and partly for an opening lock motor. The alarms are released when the time calculation reaches a predetermined point, but the calculation is interrupted when a logical process is executed manually, e.g. the opening of a door or the removal of the key. When the seal of the display unit is closed, the central unit emits a start impulse to the time calculation. - Sealing of the locked display unit comprises a closed electromagnetic circuit which is broken when a door is opened, causing the central unit to react. The circuit is composed of one or more fibres through which electromagnet waves can be transmitted. |
