Abstract: A strap feeding and withdrawing structure for a packing machine includes a driving member and a strapping member pivotally assembled on a main body of a conveying device and respectively driven by an electromagnetic switch unit and a pull member to carry out strap feeding, strap withdrawing and strap strapping work. The separable strap feeding and withdrawing structure of this invention can be disassembled quickly, facilitating maintenance and removal of disorder. In addition, the strapping member is disposed thereon with a strap withdrawal detecting member able to accurately control data of strap withdrawing and tightness of strapping.

Abstract: An automatic band conveying device includes a band transmitting device employed to pass a band into a band rail, and a pressing rail device composed of an electromagnetic valve, a connecting rod and a pressing plate. As the electromagnetic valve is electrified, it can generate magnetic force to enable a movable member pivotally formed on its top to be moved, so that the connecting rod can be driven by the movable member to push a pressing side of the pressing plate to press on the band rail. Thus the automatic band conveying device is simply structured and easy to operate.