How to use the alarm clock!

1, understand the hands: the slender one is the second hand, the two wider ones are the hour hand and the minute hand (the hour hand is short and the minute hand is long), and the thin one is the alarm clock hand.

2. Understand the functions of the knobs and switches on the back of the watch: the knob on the left side of the back sets the time, the clock on the right sets the alarm clock time, and the switch on the alarm clock is the black switch on the far right.

3. Insert the battery: Open the battery back cover on the back and press in the battery of the corresponding model ("+"is the positive electrode and "-"is the negative electrode).

4. Time setting: Turn the knob on the left side of the back to adjust the current time (clockwise or counterclockwise).

5. Set alarm time: Turn the knob on the right side of the back to set the required alarm time.

6. Finally, turn the rightmost switch upward (on and off) and the alarm clock will be set.

Extended data

Mechanism and action principle of alarm clock;

1, telescopic escapement

It is widely used in low-precision pendulum clocks, and its fork shoe lock surface and punch surface are the same plane (working surface). The working surface of the brake shoe is a cylindrical surface, and the center of its circle does not coincide with the rotation center of the escapement fork. The working surface of the tile is flat, and the fork tile and the escapement fork are made into a whole. After the impact passes, the working face of the fork shoe will force the escape wheel to retreat at a certain angle.

2. Fork-shoe escapement mechanism

One of the most widely used escapement mechanisms, when working, the escapement wheel gets energy from the transmission system, which is converted into impulse through the action of the escapement gear teeth and fork shoes and transmitted to the escapement fork. Impulse is transmitted to the vibration system through the interaction between the fork of the escape fork and the swing nail on the double-disc impact disc. The fork head nail, swing nail and bell mouth of double-disc safety disc and escapement fork are safety devices to ensure the normal operation of the mechanism.

3. Pin escapement mechanism

The difference with the fork-shoe escapement mechanism is that two cylindrical pins are used to replace the fork shoe on the escapement fork, and the impulse is only transmitted along the tooth impact surface of the escapement wheel. This escapement mechanism is simple in structure, low in precision and convenient to manufacture. It is commonly used in alarm clocks and low-precision watches, commonly known as rough horse structure. The vibration period of the vibration system multiplied by the vibration times of the measured process is the time that the process has experienced.

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