An automatic packing machine for screws is composed of an automatic feeding unit with a cylindrical material cabin having vibrator and spiral slot, and external spiral slot with vibrator, automatic counting switch and stop switch, and the full and absent sensors, loading hopper, plastic bag filling unit, thermal sealing unit, cutter and conveying belt. Its packing method includes such steps as moving the screws up along a spiral slot in cylindrical cabin under the action of vibrator, transferring them into external spiral slot, moving forward under the action of vibrator while counting, filling a predefined number of screws in plastic bag, sealing, cutting for separating plastic bags from each other and conveying. |