Angle adjusting device and image forming apparatus

1. An angle adjusting device configured to support an operations panel so that up and down rotation of the operations panel against an apparatus main body can be made in a designated angle range and configured to adjust a rotational angle of the operations panel in up and down directions against the apparatus main body, the angle adjusting device comprising:

a fixing member fixed to the apparatus main body;

a rotation member where the operations panel is provided, the rotation member being provided to the fixing member so as to be rotated with respect to a designated rotation shaft in the designated angle range;

a lock mechanism configured to lock rotation of the rotation member against the fixing member with respect to the rotation shaft, at one or more parts in the designated angle range, by using a force other than a frictional force between the fixing member and the rotation member; and

a setting mechanism configured to set a lock-on state and lock-off state of the lock mechanism,

wherein the setting mechanism includes a lock-off lever moving in a designated direction and a slide lever moving connected with movement of the lock-off lever;

the lock mechanism includes a lock pin provided at the slide lever and a plate member where a plurality of lock holes is arranged;

the lock holes face the lock pin; and

the lock pin is engaged with the lock holes along a circumference of a circle whose center is a center of the rotation shaft.

2. The angle adjusting device as claimed in claim 1 , further comprising:

an energizing part configured to force the lock pin to the plate member.

3. The angle adjusting device as claimed in claim 1 , further comprising:

means for energizing the lock pin move to the plate member.

4. The angle adjusting device as claimed in claim 1 ,

wherein a plurality of the lock pins is provided,

the lock pins are provided at different positions on the circumference of the plate member, and

the lock pins are energized by an energizing part.

5. The angle adjusting device as claimed in claim 1 ,

wherein a head of the lock pin is formed in a taper shape or a spherical surface shape.

6. An angle adjusting device configured to support an operations panel so that up and down rotation of the operations panel against an apparatus main body can be made in a designated angle range and configured to adjust a rotational angle of the operations panel in up and down directions against the apparatus main body, the angle adjusting device comprising:

a fixing member fixed to the apparatus main body;

a rotation member where the operations panel is provided, the rotation member being provided to the fixing member so as to be rotated with respect to a designated rotation shaft in the designated angle range;

a lock mechanism configured to lock rotation of the rotation member against the fixing member with respect to the rotation shaft, at plural parts in the designated angle range;

a lever reciprocating in a designated shaft direction and setting a lock-on state and a lock-off state of the lock mechanism by a moving position; and

a click mechanism configured to rotate with the rotation member in a body and engage the fixing member at parts corresponding to the plural parts where the lock mechanism locks the rotation of the rotation member against the fixing member with respect to the rotation shaft so as to generate a click sound.

7. The angle adjusting device as claimed in claim 6 ,

wherein the lock mechanism includes a lock pin preventing a relative rotation of the fixing member and the rotation member at the plural parts.

8. The angle adjusting device as claimed in claim 6 ,

wherein the rotation shaft of the rotation member for rotating against the fixing member is provided at the center of gravity of the operations panel or in the vicinity of the center of gravity of the operations panel.