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US 12,013,655 B2Granted
Heating device and image processing apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorToshihiro Sone
Life of this patent
Estimating the term…
Abstract
According to an embodiment, a heating device includes a cylindrical belt, a heater, a press roller, and a holder. The heater is disposed on an inner surface of the belt. The press roller rotates and is configured to contact an outer surface of the belt at a position opposite the heater to form a nip. The end portions of the press roller project by a first amount in a radial direction more than the central portion of the press roller. A holder has a first surface supporting the heater to face the cylindrical belt. The holder has a second surface that is opposite of the first surface with a center portion projecting in a direction orthogonal to the first surface more than the end portions of the second surface by a second projection amount that is greater than the first projection amount.
Claims20
A heating device, comprising:
- a cylindrical belt having an axial direction;
- a heater disposed on an inner surface of the cylindrical belt and having a longitudinal direction parallel to the axial direction;
- a press roller configured to contact an outer surface of the cylindrical belt at a position opposite the heater and form a nip, the press roller being configured to rotate to convey a sheet through the nip, both longitudinal end portions of the press roller projecting by a first projection amount in a radial direction of the press roller that is more than a central portion of the press roller between the longitudinal end portions in the longitudinal direction;
- a holder having a first surface supporting the heater and facing the cylindrical belt, the holder having a second surface that is opposite the first surface and has a center portion between the longitudinal end portions of the second surface projecting in a direction orthogonal to the first surface by a second projection amount that is greater than the first projection amount;
- a frame configured to support the holder at both sides of the holder in a conveying direction of the sheet through the nip, the frame being on a second surface side of the holder;
- and
- a positioning member attached to an outer surface of the frame at a position near a central portion of the frame between longitudinal end portions of the frame, a locking portion of the positioning member extending beyond the frame in a direction towards the press roller, wherein
- the holder includes an engaging portion configured to engage the locking portion of the positioning member.
5 more elements
A sheet processing apparatus, comprising:
- a sheet conveying path comprising a plurality of rollers;
- and
- a heating device configured to receive a sheet from the sheet conveying path and heat the sheet, the heating device including:
- a cylindrical belt having an axial direction;
- a heater disposed on an inner surface of the cylindrical belt and having a longitudinal direction parallel to the axial direction;
- a press roller configured to contact an outer surface of the cylindrical belt at a position opposite the heater and form a nip, the press roller being configured to rotate to convey the sheet from the sheet conveying path through the nip, both longitudinal end portions of the press roller projecting by a first projection amount in a radial direction of the press roller that is more than a central portion of the press roller between the longitudinal end portions in the longitudinal direction;
- a holder is a silicone rubber material with a first surface supporting the heater and facing the cylindrical belt, the holder having a second surface that is opposite the first surface and has a center portion between the longitudinal end portions of the second surface projecting in a direction orthogonal to the first surface by a second projection amount that is greater than the first projection amount;
- a frame configured to support the holder at both sides of the holder in a conveying direction of the sheet through the nip, the frame being on a second surface side of the holder;
- and
- a positioning member attached to an outer surface of the frame at a position near a central portion of the frame between longitudinal end portions of the frame, a locking portion of the positioning member extending beyond the frame in a direction towards the press roller, wherein
- the holder includes an engaging portion configured to engage the locking portion of the positioning member.
8 more elements
An image forming apparatus, comprising:
- an image forming unit configured to form an image on a sheet;
- and
- a fixing device configured to receive the sheet from the image forming unit and heat the image on the sheet, the fixing device including:
- a cylindrical belt having an axial direction;
- a heater disposed on an inner surface of the cylindrical belt and having a longitudinal direction parallel to the axial direction;
- a press roller configured to contact an outer surface of the cylindrical belt at a position opposite the heater and form a nip, the press roller being configured to rotate to convey the sheet from the sheet conveying path through the nip, both longitudinal end portions of the press roller projecting by a first projection amount in a radial direction of the press roller that is more than a central portion of the press roller between the longitudinal end portions in the longitudinal direction;
- a holder having a first surface supporting the heater and facing the cylindrical belt, the holder having a second surface that is opposite the first surface and has a center portion between the longitudinal end portions of the second surface projecting in a direction orthogonal to the first surface by a second projection amount that is greater than the first projection amount;
- a frame configured to support the holder at both sides of the holder in a conveying direction of the sheet through the nip, the frame being on a second surface side of the holder;
- and
- a positioning member attached to an outer surface of the frame at a position near a central portion of the frame between longitudinal end portions of the frame, a locking portion of the positioning member extending beyond the frame in a direction towards the press roller, wherein
- the holder includes an engaging portion configured to engage the locking portion of the positioning member.
8 more elements
Dependencies are inferred from the claim text.