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US 10,845,747 B2Granted
Fixing device with magnetic permeability detection
AssigneeHewlett-Packard Development Company, L.P.
InventorTakayuki Horie
Life of this patent
Estimating the term…
Abstract
A fixing device comprises a heating belt and a magnetic permeability detection device. The heating belt includes an endless belt having a metal layer and a heat source. The magnetic permeability detection device is located adjacent the heating belt to detect a magnetic permeability from the metal layer of the heating belt.
Claims16
A fixing device comprising:
- a heating belt comprising an endless belt having a metal layer;
- a heat source to heat the heating belt;
- a pusher member located in a partial region inside the heating belt, the pusher member to abut the heating belt;
- a pressing rotary body disposed to abut an outer peripheral surface of the heating belt at a position facing the pusher member to drive the heating belt, the pressing rotary body to capture a recording medium at a nip formed when the pressing rotary body is pressed against a surface of the pusher member to fix an image formed on the recording medium at the nip;
- a magnetic permeability detection device located in a region spaced from the outer peripheral surface of the heating belt and facing the metal layer to detect a magnetic permeability of the heating belt;
- a displacement pattern calculation device to calculate a current displacement pattern of magnetic permeability per perimeter of the heating belt based on variations in the magnetic permeability detected;
- and
- a fault determination device to compare the current displacement pattern with a previous displacement pattern having been previously calculated, the fault determination device to determine a fault when the current displacement pattern is different from the previous displacement pattern.
5 more elements
A fixing device comprising:
- a heating belt comprising an endless belt having a metal layer;
- a heat source to heat the heating belt;
- a pusher member located in a partial region inside the heating belt, the pusher member to abut the heating belt;
- a pressing rotary body disposed to abut an outer peripheral surface of the heating belt at a position facing the pusher member to drive the heating belt, the pressing rotary body to capture a recording medium at a nip formed when the pressing rotary body is pressed against a surface of the pusher member, in order to fix an image formed on the recording medium at the nip;
- and
- a magnetic permeability detection device located in a region spaced from the outer peripheral surface of the heating belt and facing the metal layer to detect a magnetic permeability of the heating belt,
- wherein a magnetic permeability detection pattern of metal is selectively arranged on the heating belt in a detection range of the magnetic permeability detection device, and
- wherein, when it is determined that an amount or a cycle of variation of the magnetic permeability of the heating belt has deviated from a respective predetermined range or cycle during rotation, the pressing rotary body ceases a driving of the heating belt.
5 more elements
A fixing device comprising:
- a heat source;
- a heating belt comprising an endless belt;
- a magnetic permeability detection pattern arranged on the heating belt and
- a magnetic permeability detection device located adjacent the heating belt to detect a magnetic permeability from the magnetic permeability detection pattern,
- wherein the magnetic permeability detection pattern has a varying thickness, spacing, or area in a widthwise direction of the heating belt.
2 more elements
Dependencies are inferred from the claim text.