Image-forming device controlling a cooling fan according to a position of a transfer sheet being conveyed
First Claim
Patent Images
1. An image-forming device comprising:
- fixing means for fixing a toner visible image transferred to a transfer sheet;
feeding means for feeding and conveying the transfer sheet to said fixing means;
a cooling fan discharging a heat generated in said fixing means;
conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed; and
controlling means for controlling said cooling fan to start and stop revolving according to said conveyance position;
wherein said feeding means continuously feeds and conveys a plurality of transfer sheets to said fixing means, and said controlling means controls said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range.
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Accused Products
Abstract
The image-forming device includes a fixing device for fixing a toner visible image transferred to a transfer sheet, a feeding device for feeding and conveying the transfer sheet to the fixing device, a cooling fan discharging a heat generated in the fixing device, a conveyance position detecting device for detecting a conveyance position of the transfer sheet being conveyed, and a controlling device for controlling the cooling fan to start and stop revolving according to the conveyance position.
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Citations
44 Claims
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1. An image-forming device comprising:
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fixing means for fixing a toner visible image transferred to a transfer sheet;
feeding means for feeding and conveying the transfer sheet to said fixing means;
a cooling fan discharging a heat generated in said fixing means;
conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed; and
controlling means for controlling said cooling fan to start and stop revolving according to said conveyance position;
wherein said feeding means continuously feeds and conveys a plurality of transfer sheets to said fixing means, and said controlling means controls said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (2, 3, 4, 5)
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6. An image-forming device comprising:
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fixing means for fixing a toner visible image transferred to a transfer sheet;
feeding means for feeding and conveying the transfer sheet to said fixing means;
a cooling fan discharging a heat generated in said fixing means;
timing means for measuring a conveying time of the transfer sheet being conveyed; and
controlling means for calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity, so as to control said cooling fan to start and stop revolving according to said conveyance position;
wherein said feeding means continuously feeds and conveys a plurality of transfer sheets to said fixing means, and said controlling means controls said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (7, 8, 9, 10)
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11. An image-forming device comprising:
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fixing means for fixing a toner visible image transferred to a transfer sheet;
feeding means for feeding and conveying the transfer sheet to said fixing means;
a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity;
conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed; and
controlling means for controlling the revolving velocity of said cooling fan according to said conveyance position;
wherein said feeding means continuously feeds and conveys a plurality of transfer sheets to said fixing means, and when a preceding transfer sheet exists in a predetermined conveying range, said controlling means controls said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding the transfer sheets. - View Dependent Claims (12, 13, 14, 15)
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16. An image-forming device comprising:
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fixing means for fixing a toner visible image transferred to a transfer sheet;
feeding means for feeding and conveying the transfer sheet to said fixing means;
a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity;
timing means for measuring a conveying time of the transfer sheet being conveyed; and
controlling means for calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity, so as to control the revolving velocity of said cooling fan according to said conveyance position;
wherein said feeding means continuously feeds and conveys a plurality of transfer sheets to said fixing means, and when a preceding transfer sheet exists in a predetermined conveying range, said controlling means controls said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding the transfer sheets. - View Dependent Claims (17, 18, 19, 20)
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21. A method for controlling an image-forming device including fixing means for fixing a toner visible image transferred to a transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, and conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed;
controlling said cooling fan to start and stop revolving according to said conveyance position;
continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (22)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step and said controlling step are performed only when said thin-sheet mode is set.
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23. A method for controlling an image-forming device including fixing means for fixing a toner visible image transferred to a transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, and conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed;
controlling the revolving velocity of said cooling fan according to said conveyance position;
continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (24)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step and said controlling step are performed only when said thin-sheet mode is set.
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25. A method for controlling an image-forming device including fixing means for fixing a toner visible image transferred to a transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity;
controlling said cooling fan to start and stop revolving according to said conveyance position;
continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (26)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step and said controlling step are performed only when said thin-sheet mode is set.
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27. A method for controlling an image-forming device including fixing means for fixing a toner visible image transferred to a transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity;
controlling the revolving velocity of said cooling fan according to said conveyance position;
continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (28)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step and said controlling step are performed only when said thin-sheet mode is set.
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29. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, and conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed; and
controlling said cooling fan to stop revolving when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means while continuously feeding and conveying a plurality of transfer sheets to said fixing means. - View Dependent Claims (30)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step and said controlling step are performed only when said thin-sheet mode is set.
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31. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, and conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed;
controlling said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding transfer sheets, when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means, while continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (32)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step and said controlling step are performed only when said thin-sheet mode is set.
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33. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity; and
controlling said cooling fan to stop revolving when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means while continuously feeding and conveying a plurality of transfer sheets to said fixing means. - View Dependent Claims (34)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step and said controlling step are performed only when said thin-sheet mode is set.
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35. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity; and
controlling said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding transfer sheets, when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means, while continuously feeding and conveying a plurality of transfer sheets to said fixing means. - View Dependent Claims (36)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step and said controlling step are performed only when said thin-sheet mode is set.
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37. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, and temperature-sensing means for sensing a temperature in said image-forming device, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed;
controlling said cooling fan to stop revolving when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means while continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
controlling said cooling fan to start revolving when said temperature in said image-forming device becomes equal to or higher than a predetermined temperature since said cooling fan is stopped revolving by said first controlling step. - View Dependent Claims (38)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step, said first controlling step, and said second controlling step are performed only when said thin-sheet mode is set.
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39. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, conveyance-position detecting means for detecting a conveyance position of the transfer sheet being conveyed, and temperature-sensing means for sensing a temperature in said image-forming device, the method comprising:
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detecting the conveyance position of the transfer sheet being conveyed;
controlling said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding transfer sheets, when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means, while continuously feeding and conveying a plurality of transfer sheets to said fixing means;
controlling said cooling fan to revolve at said initial revolving velocity when said temperature in said image-forming device becomes equal to or higher than a predetermined temperature since said cooling fan is revolved at the revolving velocity lower than said initial revolving velocity by said first controlling step; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (40)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position detecting step, said first controlling step, and said second controlling step are performed only when said thin-sheet mode is set.
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41. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity;
controlling said cooling fan to stop revolving when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means while continuously feeding and conveying a plurality of transfer sheets to said fixing means; and
the second controlling step of controlling said cooling fan to start revolving when a predetermined time elapses since said cooling fan is stopped revolving by said first controlling step. - View Dependent Claims (42)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step, said first controlling step, and said second controlling step are performed only when said thin-sheet mode is set.
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43. A method for controlling an image-forming device including transferring means for transferring a toner visible image to a transfer sheet, fixing means for fixing the toner visible image transferred to the transfer sheet, feeding means for feeding and conveying the transfer sheet to said fixing means, a cooling fan discharging a heat generated in said fixing means by revolving at a variable revolving velocity, and timing means for measuring a conveying time of the transfer sheet being conveyed, the method comprising:
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calculating a conveyance position of the transfer sheet being conveyed, based on said conveying time and a predetermined conveying velocity;
controlling said cooling fan to revolve at a revolving velocity lower than an initial revolving velocity upon the start of feeding transfer sheets, when a transfer sheet preceding the present transfer sheet exists between said transferring means and said fixing means, while continuously feeding and conveying a plurality of transfer sheets to said fixing means;
controlling said cooling fan to revolve at said initial revolving velocity when a predetermined time elapses since said cooling fan is revolved at the revolving velocity lower than said initial revolving velocity by said first controlling step; and
controlling said cooling fan to stop revolving when a preceding transfer sheet exists in a predetermined conveying range. - View Dependent Claims (44)
the mode confirming step of confirming whether or not said thin-sheet mode is set so that said conveyance-position calculating step, said first controlling step, and said second controlling step are performed only when said thin-sheet mode is set.
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Specification