Image reading apparatus and image forming apparatus
First Claim
1. An image reading apparatus comprising:
- an apparatus main body;
an opening/closing portion configured to be rotatable with respect to the main body, around a hinge shaft;
a biasing portion configured to (i) apply a force to the opening/closing portion in an opening direction to generate a moment about the hinge shaft higher than a moment of the self-weight of the opening/closing portion about the hinge shaft in a state in which the opening/closing portion is in a range from a closed position to a predetermined rotation angle with respect to the apparatus main body and (ii) generate a moment about the hinge shaft that is substantially balanced with the moment of the self-weight of the opening/closing portion about the hinge shaft in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and
a holding portion configured to hold the opening/closing portion in a holding state, the holding state being the state of the opening/closing portion at the closed position,wherein, in a case that the holding state is released, the opening/closing portion rotates from the closed position to the predetermined rotation angle by the force applied by the biasing portion.
1 Assignment
0 Petitions
Accused Products
Abstract
An image reading apparatus includes: an opening/closing portion configured to be rotatable around a hinge shaft; a biasing portion configured to apply a force to the opening/closing portion such that moment of the hinge shaft rotation higher than moment of the hinge shaft rotation according to self-weight of the opening/closing member is generated in a state in which the opening/closing portion is placed in a range up to a predetermined rotation angle from a closed position with respect to the apparatus main body, and moment of the hinge shaft rotation that is balanced with the moment of the hinge shaft rotation according to the self-weight of the opening/closing portion is generated in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and a holding portion configured to maintain the opening/closing portion at the closed position.
12 Citations
22 Claims
-
1. An image reading apparatus comprising:
-
an apparatus main body; an opening/closing portion configured to be rotatable with respect to the main body, around a hinge shaft; a biasing portion configured to (i) apply a force to the opening/closing portion in an opening direction to generate a moment about the hinge shaft higher than a moment of the self-weight of the opening/closing portion about the hinge shaft in a state in which the opening/closing portion is in a range from a closed position to a predetermined rotation angle with respect to the apparatus main body and (ii) generate a moment about the hinge shaft that is substantially balanced with the moment of the self-weight of the opening/closing portion about the hinge shaft in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and a holding portion configured to hold the opening/closing portion in a holding state, the holding state being the state of the opening/closing portion at the closed position, wherein, in a case that the holding state is released, the opening/closing portion rotates from the closed position to the predetermined rotation angle by the force applied by the biasing portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An image forming apparatus comprising:
-
an image reading portion configured to read an original; and an image forming portion configured to form an image on a sheet, wherein the image reading portion includes; an apparatus main body including an original placement portion on which the original is placed and an image reading unit that reads the original placed on the original placement portion; an opening/closing portion to be rotatable around a hinge shaft so as to be opened or closed the original placement portion; a biasing portion configured to apply a force to the opening/closing portion in an opening direction such that (i) a moment about the hinge shaft higher than a moment of the self-weight of the opening/closing portion about the hinge shaft is generated so as to open the opening/closing portion in a state in which the opening/closing portion is placed in a range from a closed position to a predetermined rotation angle with respect to the apparatus main body and (ii) a moment about the hinge shaft is balanced with the moment of the self-weight of the opening/closing portion about the hinge shaft is generated so as to stop the opening/closing portion in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and a holding portion configured to hold the opening/closing portion in a holding state, the holding state being the state of the opening/closing portion at the closed position, wherein, in a case that the holding state is released, the opening/closing portion rotates from the closed position to the predetermined rotation angle by the force applied by the biasing portion.
-
-
12. An image reading apparatus comprising:
-
an apparatus main body; an opening/closing portion configured to be rotatable with respect to the main body around a hinge shaft; a biasing portion configured to apply a force to the opening/closing portion in an opening direction such that (i) the opening/closing portion is rotated to a predetermined rotation angle in a state in which the opening/closing portion is in a range from a closed position to the predetermined rotation angle with respect to the apparatus main body and (ii) the opening/closing portion is stopped in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and a holding portion configured to hold the opening/closing portion in a holding state, the holding state being the state of the opening/closing portion at the closed position, wherein, in a case that the holding state is released, the opening/closing portion rotates from the closed position to the predetermined rotation angle. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. An image forming apparatus comprising:
-
an image reading portion configured to read an original; and an image forming portion configured to form an image on a sheet, wherein the image reading portion includes; an apparatus main body including an original placement portion on which the original is placed and an image reading unit that reads the original placed on the original placement portion; an opening/closing portion to be rotatable around a hinge shaft so as to open or close the original placement portion; a biasing portion configured to apply a force to the opening/closing portion in an opening direction such that (i) the opening/closing portion is rotated to a predetermined rotation angle in a state in which the opening/closing portion is in a range from a closed position to the predetermined rotation angle with respect to the apparatus main body and (ii) the opening/closing portion is stopped in a state in which the opening/closing portion is opened more than the predetermined rotation angle; and a holding portion configured to hold the opening/closing portion in a holding state, the holding state being the state of the opening/closing portion at the closed position, wherein, in a case that the holding state is released, the opening/closing portion rotates from the closed position to the predetermined rotation angle.
-
Specification