Bidirectional feed mechanism of a fetal monitor printer

摘要

A feed mechanism and method for feeding zigzag paper from either side of a zigzag paper pack. Zigzag paper is inserted into a paper retention pocket in a door pivoted to a housing. The door is then closed, causing the paper pack to stand upright vertically and an end of the paper to become positioned between a drive roller and a print head and between a drag spring and guide element. The drag spring biases against the guide element and is arranged above a base of the paper retention pocket over the zigzag paper pack. The drive roller pulls the paper between the drag spring and guide element and out of the pocket.