Arm rotating device and image forming apparatus provided with the same

摘要

The elastic force of a spring 41 in a direction of an arrow X is applied to an end 51A of a coil spring 5A in a direction of an arrow Y through a holding plate 42. The end 52A of the coil spring 5A is engaged with a holding hole 12 and regulated from moving in the direction of the arrow Y. The elastic force of the spring 41 in the direction of the arrow X is constantly applied to the coil spring 5A in a direction in which the peripheral surface of the support post 3 is tightened.

主权项

1. An arm rotating device comprising:
a support post that is rotatably supported within a predetermined angle of rotation with respect to the device; an arm that has a fixed end and a free end, the arm being fixed to the support post on a side of the fixed end and being configured to enable an operating body to be mounted on a side of the free end; a coil spring that is wound around a peripheral surface of the support post and applies an elastic force in a rotating direction of the support post; and a holding portion that holds at least one end of the coil spring in a movable manner while biasing the one end of the coil spring in the rotating direction in which the elastic force of the coil spring is increased, wherein the holding portion comprises an elastic member that biases at least the one end of the coil spring in the rotating direction in which the elastic force of the coil spring is increased.