Structure for preventing formation of dead point for cam wheel and strapping device using the same

A structure of a strapping device for preventing the formation of a dead point for a cam wheel, comprising:

• a driving wheel, provided with a pressing portion arranged to be coaxial with the driving wheel at one side thereof;
• a cam wheel, pivoted on the driving wheel in a way of being axially movable with respect to the driving wheel, the cam wheel including a cam portion and a pushed portion around the same axis, the pushed portion in contact with the pressing portion, the pushed portion being pushed by the pressing portion when the driving wheel rotates, such that the cam wheel is moved axially in a direction away from one side of the driving wheel;
• a swinging piece, with one end abutting against the outer periphery of the cam wheel by force from a mechanism, such that the one end of the swinging piece is pushed by the cam portion when the cam wheel axially moves and rotates;
• and
• a restoring piece, connected with the cam wheel for axially pushing the cam wheel back to its original position when the one end of the swinging piece is moved to be apart from the outer periphery of the cam wheel.