Watch clasp capable of finely adjusting watch strap length

A watch clasp for adjusting a watch strap length, comprising:

• a watch clasp sliding holder located on a back surface of a watch clasp case;
• a sliding stop module fixing the watch clasp sliding holder to the back surface of the watch clasp case through engagement, wherein the sliding holder slides between the watch clasp case and the sliding stop module;
• a stop spring bar fixed to the watch clasp case;
• an unlock module fixed to the watch clasp case, wherein the unlock module is engaged with the sliding stop module, and the stop spring bar and the unlock module are respectively located on two sides of the sliding stop module;
• and
• an extension latch assembly, wherein one end of the extension latch assembly is fixed to the watch clasp case, and another end of the extension latch assembly is fixed to an elastic fine-adjusting assembly,
• wherein the elastic fine-adjusting assembly includes a supporter, a slider, a spring bar shaft, a drive block, a fixing spring bar, and a leaf spring, the leaf spring is embedded into a connection port on the drive block, and the fixing spring bar fixes the drive block to the supporter, and
• the fixing spring bar fixes the slider to the supporter, the spring bar shaft is fixed to the slider, and the spring bar shaft is configured to connect to a watch strap.

A watch strap, comprising a watch clasp that adjusts a length of the watch strap, the watch clasp including:

• a watch clasp sliding holder, located on a back surface of a watch clasp case;
• a sliding stop module, fixing the watch clasp sliding holder to the back surface of the watch clasp case through engagement, wherein the sliding holder slides between the watch clasp case and the sliding stop module;
• a stop spring bar, fixed to the watch clasp case, and an unlock module, fixed to the watch clasp case, the unlock module including a main toggle arm that drives an auxiliary toggle arm of the sliding stop module, the auxiliary toggle arm being flexibly connected to the main toggle arm, and the stop spring bar and the unlock module being respectively located on two sides of the sliding stop module;
• and
• an extension latch assembly, wherein one end of the extension latch assembly is fixed to the watch clasp case, and another end of the extension latch assembly is fixed to an elastic fine-adjusting assembly.

A watch, comprising a watch strap and a watch clasp connected to the watch strap, the watch clasp adjusting a length of the watch strap, and the watch clasp including:

• a watch clasp sliding holder, located on a back surface of a watch clasp case;
• a sliding stop module, fixing the watch clasp sliding holder to the back surface of the watch clasp case through engagement, wherein the sliding holder slides between the watch clasp case and the sliding stop module;
• a stop spring bar, fixed to the watch clasp case, and an unlock module, fixed to the watch clasp case, the unlock module including a main toggle arm that drives an auxiliary toggle arm of the sliding stop module, the auxiliary toggle arm being flexibly connected to the main toggle arm, and the stop spring bar and the unlock module being respectively located on two sides of the sliding stop module;
• and
• an extension latch assembly, wherein one end of the extension latch assembly is fixed to the watch clasp case, and another end of the extension latch assembly is fixed to an elastic fine-adjusting assembly.