| CPC G03G 21/1633 (2013.01) [G03G 21/168 (2013.01); G03G 2221/169 (2013.01)] | 4 Claims |
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1. A unit locating mechanism comprising:
a cover that is turned around an axis line of a first turning shaft extending in a first direction orthogonal to an up/down direction to be able to be displaced between
a closed position in which an interior of a main body frame is covered from one side in a second direction horizontally orthogonal to the first direction and
an open position other than the closed position;
a first unit that is fitted to the interior of the main body frame and includes a boss portion;
a second unit that
is arranged on a downstream side in a closing direction extending from the open position to the closed position with respect to the cover and
is turned around an axis line of a second turning shaft extending parallel to the first turning shaft in a position which is above the first turning shaft and is on an other side opposite to the one side in the second direction with respect to the first turning shaft so as to be able displaced between
a first position located with respect to the first unit and
a second position other than the first position;
a locating member that is attached to the second unit to retain the second unit in the first position; and
a torsion coil spring that is attached to the locating member,
wherein the locating member includes:
a cylindrical portion in which the first direction is a direction of a cylindrical shaft; and
a hook portion that
is arranged radially outward of the cylindrical portion when viewed in the first direction,
can engage with the boss portion so as to hold the boss portion from one side in a circumferential direction around a center of the cylindrical shaft of the cylindrical portion and
engages with the boss portion when the second unit is in the first position to restrict the turning of the second unit from the first position to the second position,
the second unit includes
a support shaft
to which the cylindrical portion is fitted and
which supports the locating member such that the locating member can be displaced in the circumferential direction,
the torsion coil spring biases the locating member to the one side in the circumferential direction that causes the hook portion to engage with the boss portion,
the cover includes a first pressing portion and a second pressing portion,
the second unit includes a unit-side reception portion that receives a pressure from the first pressing portion,
the locating member includes a hook-side reception portion that receives a pressure from the second pressing portion,
when the cover is turned from the open position in the closing direction, the first pressing portion starts to press the unit-side reception portion such that the second unit is turned to the first position,
after the first pressing portion starts to press the unit-side reception portion, a tip of the hook portion is in contact with the boss portion such that the locating member is displaced to an other side in the circumferential direction against a biasing force of the torsion coil spring,
after a contact point of the tip of the hook portion with the boss portion passes through a lowest point of the boss portion when viewed in the first direction, the second pressing portion is in contact with the hook-side reception portion from the one side in the circumferential direction such that
the second pressing portion starts to press the hook-side reception portion to displace the locating member to the one side in the circumferential direction and
the locating member is displaced to the one side in the circumferential direction to cause the hook portion to engage with the boss portion,
after the turning of the cover in the closing direction is started until the cover reaches the closed position, positions of the first turning shaft and the second turning shaft when viewed in the first direction are different from each other such that the unit-side reception portion is separated from the first pressing portion and
after the hook portion engages with the boss portion to stop the displacement of the locating member to the one side in the circumferential direction, the turning of the cover in the closing direction is continued such that
one of the second pressing portion and the hook-side reception portion is elastically deformed in a direction away from an other thereof,
the second pressing portion rides over the hook-side reception portion and
the pressing of the hook-side reception portion performed by the second pressing portion is released.
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