Fixing device and image forming apparatus
First Claim
1. A fixing device, comprising:
- a rotatable endless belt fixing member;
a pressure member located at an outer circumferential side of the fixing member, configured to press against the fixing member;
a nip forming member located at an inner circumferential side of the fixing member, configured to contact the pressure member through the fixing member to form a nip;
a reinforcing member fixed at a bore of the fixing member, configured to support the nip forming member from the opposite side of the nip;
a heating member configured to directly or indirectly heat a predetermined area of the fixing member at an upstream side of the nip;
a flange member comprising a cylinder inserted in an inner circumference of the fixing member at an edge of the fixing member in an axial direction thereof and configured to rotatably hold an edge vicinity of the fixing member directly or indirectly with the outer circumferential surface of the cylinder, and a flange fixed on a frame of the fixing device,wherein the cylinder of the flange member comprises a notch in the circumference configured to contain the nip forming member, and further comprises an arc-shaped outer circumferential cross-section at an area corresponding to an area where the fixing member is heated by the heating member, having a predetermined radius equivalent to a radius of the fixing member, and the arc-shaped outer circumferential cross-section has a center located at an upstream side in a recording medium feeding direction relative to a center line of the nip forming member in the recording medium feeding direction, andwherein the fixing member is not supported beyond at least the upstream side of the nip in the direction of rotation of the fixing member, except by the flange member at the axial edge vicinity of the fixing member.
1 Assignment
0 Petitions
Accused Products
Abstract
A fixing device, including a fixing member; a pressure member; a nip forming member; a reinforcing member; a heating member; and a flange member including a cylinder inserted in an inner circumference at an edge of the fixing member in an axial direction thereof and a flange fixed on a frame of the fixing device, wherein the cylinder of the flange member includes a notch storing the nip forming member at a part on the circumference, has an arc-shaped outer circumferential cross-section at an area corresponding to an area where the fixing member is heated by the heating member, having a predetermined radius equivalent to a radius of the fixing member, and the arc has a center located at an upstream side in a recording medium feeding direction relative to a center line of the nip forming member in the recording medium feeding direction.
129 Citations
6 Claims
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1. A fixing device, comprising:
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a rotatable endless belt fixing member; a pressure member located at an outer circumferential side of the fixing member, configured to press against the fixing member; a nip forming member located at an inner circumferential side of the fixing member, configured to contact the pressure member through the fixing member to form a nip; a reinforcing member fixed at a bore of the fixing member, configured to support the nip forming member from the opposite side of the nip; a heating member configured to directly or indirectly heat a predetermined area of the fixing member at an upstream side of the nip; a flange member comprising a cylinder inserted in an inner circumference of the fixing member at an edge of the fixing member in an axial direction thereof and configured to rotatably hold an edge vicinity of the fixing member directly or indirectly with the outer circumferential surface of the cylinder, and a flange fixed on a frame of the fixing device, wherein the cylinder of the flange member comprises a notch in the circumference configured to contain the nip forming member, and further comprises an arc-shaped outer circumferential cross-section at an area corresponding to an area where the fixing member is heated by the heating member, having a predetermined radius equivalent to a radius of the fixing member, and the arc-shaped outer circumferential cross-section has a center located at an upstream side in a recording medium feeding direction relative to a center line of the nip forming member in the recording medium feeding direction, and wherein the fixing member is not supported beyond at least the upstream side of the nip in the direction of rotation of the fixing member, except by the flange member at the axial edge vicinity of the fixing member. - View Dependent Claims (2, 4, 5, 6)
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3. A fixing device, comprising:
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a rotatable endless belt fixing member; a pressure member located at an outer circumferential side of the fixing member, configured to press against the fixing member; a nip forming member located at an inner circumferential side of the fixing member, configured to contact the pressure member through the fixing member to form a nip; a reinforcing member fixed at a bore of the fixing member, configured to support the nip forming member from the opposite side of the nip; a heating member configured to directly or indirectly heat a predetermined area of the fixing member at an upstream side of the nip; a flange member comprising a cylinder inserted in an inner circumference of the fixing member at an edge of the fixing member in an axial direction thereof and configured to rotatably hold an edge vicinity of the fixing member directly or indirectly with the outer circumferential surface of the cylinder, and a flange fixed on a frame of the fixing device, wherein the cylinder of the flange member comprises a notch in the circumference configured to contain the nip forming member, and further comprises an arc-shaped outer circumferential cross-section at an area corresponding to an area where the fixing member is heated by the heating member, having a predetermined radius equivalent to a radius of the fixing member, and the arc-shaped outer circumferential cross-section has a center located at an upstream side in a recording medium feeding direction relative to a center line of the nip forming member in the recording medium feeding direction, further comprising a corresponding flat escape area located at a downstream side in a rotational direction of the fixing member relative to the exit area of the nip.
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Specification