Opening and closing mechanism of hinged pair of bodies

摘要

A device comprising a pair of lower and upper bodies respectively accommodating an image scanner and a printer. The upper body is hinged at one end thereof to the lower body so that the other end thereof is allowed to move between open and close positions. A biasing mechanism is provided for biasing the upper body not to fall down toward the second body due to the weight thereof and keep it at an arbitrary position between the open and close positions. The biasing mechanism includes a spring member and applies a first biasing force to the upper body by linearly stretching the spring member. When the upper body is in the vicinity of the lower body, the biasing mechanism further generates a second biasing force to be applied to the upper body by bending the linearly stretched spring member.