Automatic winder

An automatic winder comprising:

• a base having a support mounted on the base;
• a motor mounted on the base and having a front end and a motor shaft mounted rotatably on the front end;
• a transmission device connecting to the motor and having
• a high-speed driving gear mounted securely around the motor shaft;
• a low-speed driving gear mounted around the motor shaft, being capable of rotating in a single rotational direction around the motor shaft;
• a transmission shaft mounted rotatably through the support;
• a high-speed driven gear mounted on rotatably around the transmission shaft, engaging with the high-speed driving gear and having a rear end;
• a clutch mounted slidably around the transmission shaft, selectively engaging completely or halfway with the high-speed driven gear and having a front end selectively abutting the rear end of the high-speed driven gear tightly, a rear end and a sleeve formed on and extending from the rear end of the clutch and mounted around the transmission shaft;
• a low-speed driven gear mounted around the sleeve on the clutch, being capable of rotating in a single rotational direction around the sleeve;
• and
• a spring mounted around the transmission shaft, located between and pressing against the support and the clutch and biasing the front end of the clutch to tightly abut the rear end of the high-speed driven gear;
• and
• a reel mounted securely around the transmission shaft and having spool of a cord,
• whereby the clutch separates from the high-speed driven gear and causes the high-speed driven gear to idle to make the motor drive the reel through the low-speed driving gear and the low-speed driven gear when the motor is overloaded.