Bag feeding device for packaging machine

The utility model discloses a bag feeding device for a packaging machine, which comprises a square shaft, a pair of bag edge clamping mechanisms is arranged on the side portion of the square shaft, an opening expanding mechanism is arranged on the side portion of the square shaft corresponding to the position between the bag edge clamping mechanisms, and the opening expanding mechanism is used for expanding and fixing a bag opening of a packaging bag. According to the bag feeding device for the packaging machine adopting the structure, the bag opening of the packaging bag is opened and clamped through the opening supporting mechanism, the bag opening of the packaging bag is prevented from being expanded when the packaging bag is transferred, and therefore the bag feeding device can adapt to the packaging bags of various structures. 本实用新型公开了一种包装机用上袋装置，包括方轴，所述方轴侧部设置有一对袋边夹持机构，所述方轴侧部对应所述袋边夹持机构之间的位置设置有撑口机构，所述撑口机构用于撑开并固定包装袋袋口。本实用新型采用上述结构的一种包装机用上袋装置，通过撑口机构撑开包装袋袋口并夹紧，避免了转移包装袋的时候包装袋袋口扩大，从而能够适应多种结构的包装袋。