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US 4,309,591 AGranted
Heating and fixing device for toner image
AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Kanoto, Shigeru Ueda
Life of this patent
Estimating the term…
Abstract
A fixing device in which a toner image support member is pressure-held between and conveyed by a pair of rollers at least one of which is heated to a temperature at which the toner image may be fixed on the support member, characterized in that the end of at least one of the rollers which tends to be higher in temperature is cooled or the opposite end of said at least one roller is supplied with heat, whereby the thermally expanded state of said at least one roller and the thermally expanded state of the other roller are maintained in such a condition that the toner image support member is not laterally displaced from a predetermined conveyance path.
Claims24
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers, at least one of which is thermally expansible, for pressure-holding the toner image support member therebetween and conveying the same;
- means for supporting said first and second rollers;
- means for transmitting a drive force from a drive source to at least one of said first and second rollers;
- heating means for heating at least one of said first and second rollers to a temperature at which the toner image is fixed on said support member;
- and
- means for adjusting the temperature difference between the opposite ends of at least one of said first and second rollers to render the thermal expansion amount difference between the opposite ends of said first and second rollers to substantially zero in order to prevent said toner image support member from being displaced transversely from a predetermined conveyance path.
3 more elements
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers, at least one of which is thermally expansible, for pressure-holding the toner image support member therebetween and conveying the same;
- means for supporting said first and second rollers;
- heating means for heating at least one of said first and second rollers to a temperature at which the toner image may be fixed on said support member;
- rotational force transmitting means connected to a shaft on a first end of said first roller, said means being effective to transmit to said first roller the rotational force generated by a driving source to rotatively drive said first roller, and
- adjusting means for cooling a second end of said first roller which is opposite to said first end, said adjusting means being effective to take from said second end of said first roller an amount of heat corresponding to the amount of heat taken by said rotational force transmitting means from said first end of said first roller, thereby holding the thermally expanded states of said first and second rollers in such a condition that the toner image support member is prevented from being displaced transversely from a predetermined conveyance path.
2 more elements
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers, at least one of which is thermally expansible, for pressure-holding the toner image support member and conveying the same;
- means for supporting said first and second rollers;
- main heating means for heating at least one of said first and second rollers to a temperature at which the toner image may be fixed on the support member;
- rotational force transmitting means connected to the shaft on a first end of said first roller, said means being effective to transmit to said first roller the rotational force generated by a driving source to rotatively drive said first roller;
- and
- adjusting means, including auxiliary heating means, for supplying a greater amount of heat to said first end of said first roller than to a second end of said first roller which is opposite to said first end, thereby holding the thermally expanded state of said first and second rollers in such a condition that the toner image support member may be prevented from being displaced transversely from a predetermined conveyance path.
3 more elements
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers, at least one of which is thermally expansible, for pressure-holding the toner image support member therebetween and conveying the same;
- means for supporting said first and second rollers;
- means for transmitting a drive force from a drive source to at least one of said first and second rollers;
- heating means for heating at least one of said first and second rollers to a temperature at which the toner image may be fixed on the support member;
- detector means for detecting the position of said toner image support member with respect to the widthwise direction thereof;
- and
- adjust means for adjusting the temperature difference between the opposite ends of at least one of said first and second rollers in accordance with the signal formed by said detector means, to thereby hold the thermally expanded states of said first and second rollers in such a thermally expanded condition that displacement of said toner image support member from a predetermined conveyance path in the widthwise direction of said support member may be prevented.
4 more elements
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers at least one of which is thermally expansible for pressure-holding the toner image support member therebetween and conveying the same;
- means for supporting said first and second rollers;
- heating means for heating at least one of said first and second rollers to a temperature at which the toner image may be fixed on said support member;
- rotational force transmitting means connected to the shaft on a first end of said first roller, said means being effective to transmit to said first roller the rotational force generated by a driving source to rotatively drive said first roller;
- detector means for detecting the position of said toner image support member with respect to the widthwise direction thereof;
- and
- cooling means for cooling a second end of said first roller which is opposite to said first end in accordance with the signal formed by said detector means, to thereby hold the thermally expanded states of said first and second rollers in such a thermally expanded condition that displacement of the toner image support member from a predetermined conveyance path in the widthwise direction of said support member may be prevented.
4 more elements
A device for heating and fixing a toner image on a support member, comprising:
- first and second rollers, at least one of which is thermally expansible, for pressure-holding the toner image support member therebetween and conveying the same;
- means for supporting said first and second rollers;
- main heating means for heating at least one of said first and second rollers to a temperature at which the toner image may be fixed on the support member;
- rotational force transmitting means connected to the shaft on a first end of said first roller, said means being effective to transmit the rotational force generated by a drive source to rotatively drive said first roller;
- detector means for detecting the position of said toner image support member with respect to the widthwise direction thereof;
- and
- auxiliary heating means for imparting a greater amount of heat to said first end of said first roller than to a second end of said first roller which is opposite to said first end in accordance with the signal formed by said detector means, thereby holding the thermally expanded state of said first and second rollers in such a condition that said toner image support member is prevented from being displaced transversely from a predetermined conveyance path.
4 more elements
Dependencies are inferred from the claim text.