Medium supply device and image forming apparatus

摘要

A medium supply device includes a medium cassette that accommodates a medium, a dial that is rotatable around a predetermined rotation shaft, an angle-holding part to hold the dial, a subsidiary arm including arm parts that are independently displaceable, and a detection switch with switch parts that are pressed by arm parts of the subsidiary arm. The dial includes a display part on which display elements illustrating a medium size are arranged in a circumferential direction around the rotation shaft, a rotation lock part configured to be locked by the angle-holding part, and a projection formation part that includes projection parts configured to press the arm parts of the subsidiary arm in a circumferential direction around the rotation shaft. The projection parts selectively contact and displace the arm parts in accordance with the rotation angle of the dial to selectively press the switch parts of the detection switch.

主权项

1. A medium supply device, comprising:
a medium cassette that accommodates a medium and that is installed into a predetermined installation part; a dial that is provided on the medium cassette and that is rotatable around a predetermined rotation axis; a position-holding part that is configured to hold the dial at a predetermined rotation position; an arm member that is provided to face the dial of the medium cassette that is installed on the installation part and that includes a plurality of arm parts that are independent of each other and that are independently displaceable; and a detection switch that includes a plurality of switch parts that are pressed by the plurality of arm parts of the arm member, wherein the dial includes
a display part on which a plurality of display elements that illustrate a medium type are arranged in a circumferential direction around the predetermined rotation axis,a rotation engagement member that is configured to be engaged by the position-holding part, anda projection formation part that includes a plurality of projection parts configured to press the plurality of arm parts of the arm member in a circumferential direction around the predetermined rotation axis, the projection parts of the projection formation part selectively contact and displace the arm parts of the arm member in accordance with the rotation position of the dial to selectively press the switch parts of the detection switch, the display part, the rotation engagement member and the projection formation part are integrally combined in an axial direction of the predetermined rotation axis, and the rotation enegagement member forms a plurality of engaged parts that are engageable with an engagement part of the position-holding part and that are positioned in the circumferential direction around the predetermined rotation axis at an even interval.