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US 5,149,941 AGranted
Image fixing apparatus with movable sheet member and detectors
AssigneeCanon Kabushiki Kaisha
InventorsHiromitsu Hirabayashi, Kensaku Kusaka, Atsushi Arai, Yoshiaki Takayanagi
Life of this patent
Estimating the term…
Abstract
An image fixing apparatus for fixing an unfixed image formed on an image carrying member, includes a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon, and a heat generating element contacted to such a side of the sheet member as is opposite to a side thereof contactable to the unfixed image, the heat generating element being fixed in use.
Claims66
An image fixing apparatus for fixing an unfixed image formed on an image carrying member, comprising:
- a non-endless wound sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- means for rewinding said sheet member;
- a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image, said heat generating element being disposed in a fixed position;
- and
- means for detecting a remaining amount of said sheet member.
2 more elements
An image fixing apparatus for fixing an unfixed image formed by toner on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image;
- a contacting member for contacting a backside of the image carrying member at a position opposed to said heat generating element, said contacting member having a temperature in use which is lower than a fusing temperature of the toner and including a rotatable member for press-contacting the image carrying member to said sheet member and press-contacting said sheet member to said heat generating element;
- and
- means for cooling said rotatable member.
2 more elements
An image fixing apparatus for fixing an unfixed image formed by toner on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- and a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image;
- and
- power supply means for intermittently supplying electric power to said heat generating element.
1 more element
An image fixing apparatus for fixing an unfixed image formed by toner on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image, said heat generating element including a heat generating portion extending in a direction crossing with a direction of conveyance of the image carrying member;
- and
- power supply means for intermittently supplying electric power to said heat generating element so as to satisfy the following:
- .tau.<1Vp
- where .tau. is energy supply duration (ms) per one power supply by said power supply means;
- 1 is a heat generating width (micron) of said heat generating element;
- and Vp is a speed of the conveyance (mm/sec) of the image carrying member.
5 more elements
An image fixing apparatus for fixing an unfixed image formed on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image, said heat generating element including a heat generating portion extending in a direction crossing with a direction of conveyance of the image carrying member;
- and
- power supply means for intermittently supplying electric power to said heat generating element so as to satisfy the following:
- Vp/1.ltoreq..nu.<2Vp/1
- where Vp is a speed of the conveyance (mm/sec) of the image carrying member;
- 1 is a heat generating width (micron) of said heat generating element;
- and .nu. is a frequency (1/ms) of the intermittent power supply to said heat generating element.
5 more elements
An image forming apparatus for fixing an unfixed image formed by toner on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image, said heat generating element having a linear heat generating portion, and said heat generating portion being fixed in use and being maintained substantially at a predetermined temperature;
- detecting means for substantially detecting a temperature of said heat generating element, wherein power supply to said heat generating portion is controlled in accordance with an output of said detecting means to maintain said heat generating element at the predetermined temperature;
- and
- an insulating layer provided between said heat generating portion and said temperature detecting means.
2 more elements
An image forming apparatus for fixing an unfixed image formed by toner on an image carrying member, comprising:
- a sheet member movable together with the image carrying member in contact with the unfixed image carried thereon;
- a heat generating element contacted to such a side of said sheet member as is opposite to a side thereof contactable to the unfixed image, said heat generating element having a linear heat generating portion, and said heat generating portion being fixed in use;
- and
- a rotatable member for press-contacting the image carrying member to said sheet member and press-contacting said sheet member to said heat generating element;
- wherein said heat generating portion is within a width of contact area between said rotatable member and the image carrying member and the width of the contact area is larger at ends of said rotatable member in a direction of rotational axis thereof than at a middle position, whereas said heat generating member has a uniform width.
2 more elements
An image fixing apparatus, comprising:
- a heater which is stationary in use;
- a sheet slidable relative to the heater and movable with a recording material, a visualized image on the recording material being heated by said heater through said sheet;
- a pressing member press-contactable to the sheet to form a nip;
- wherein said heater includes only one heat generating resistor for generating heat upon application of an electric power supply thereto and extending in said nip in a direction substantially perpendicular to a direction of movement of said sheet, and a temperature detecting element for detecting a temperature of said heater to control the electric power supply to said heater, said temperature detecting element being integral with said heat generating resistor and being disposed within a width of said heat generating resistor and within said nip.
1 more element
An image fixing apparatus, comprising:
- a heat generating resistor fixed in use for generating heat upon application of an electric power supply thereto;
- a sheet substantially slidable relative to said heat generating resistor;
- a thermally low conductivity material integral with said heat generating resistor and disposed at such a side of said heat generating resistor as is remove from said sheet.
An image fixing apparatus, comprising:
- a heater disposed in a fixed location;
- a sheet slidable relative to said heater and movable with a recording material bearing a visualized image which is heated by said heater through said sheet;
- and
- a grounded conductive member contacted to a side of said sheet as is contactable to said heater.
1 more element
Dependencies are inferred from the claim text.