Automatic sheet feeding device with selectively applied pressure member
First Claim
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1. An automatic sheet feeding device, comprising:
- mounting means for mounting a stack of sheets;
feeding means for feeding each sheet of the stack of sheets from the stack;
pressing means for pressing against the stack of sheets after a start of a sheet feeding operation, thereby urging the stack of sheets against said feeding means;
recording means for recording a number of operations of said pressing means; and
control means for controlling operation of said pressing means, wherein said pressing means operates when a sheet feeding operation of the feeding means starts after the number of operations of the pressing means recorded by said recording means has reached a predetermined number.
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Abstract
An automatic sheet feeding device includes a mounting unit for mounting a stack of sheets, a feeder for feeding each sheet of the stack of sheets, and a pressing unit for pressing the stack of sheets against the feeder by operating on the stack of sheets whenever necessary after feeding a sheet, a recording unit for recording the number of operations of the pressing unit, and a controller for causing the pressing unit to operate when a sheet feeding operation of the feeder starts after the number of operations of the pressing unit has reached a predetermined number.
24 Citations
20 Claims
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1. An automatic sheet feeding device, comprising:
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mounting means for mounting a stack of sheets;
feeding means for feeding each sheet of the stack of sheets from the stack;pressing means for pressing against the stack of sheets after a start of a sheet feeding operation, thereby urging the stack of sheets against said feeding means; recording means for recording a number of operations of said pressing means; and control means for controlling operation of said pressing means, wherein said pressing means operates when a sheet feeding operation of the feeding means starts after the number of operations of the pressing means recorded by said recording means has reached a predetermined number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16)
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9. An automatic sheet feeding device, comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; pressing means for pressing against the stack of sheets after a start of a sheet feeding operation, thereby urging the stack of sheets against said feeding means; recording means for recording a number of operations of the pressing means, said recording means recording the number of operations of said pressing means by accumulating operating time of said pressing means; and control means fop controlling operation of said pressing means, wherein said pressing means operates when a sheet feeding operation of the feeding means starts after the number of operations of the pressing means recorded by said recording means has reached a predetermined number.
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10. An automatic sheet feeding device, comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; detection means for detecting a feeding error; pressing means for pressing against the stack of sheets when the feeding error is detected by said detection means, thereby urging the stack of sheets against said feeding means; counting means for counting a number of operations of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when said feeding means operates, without regard to detection of the feeding error, whenever the number of operations of the pressing means counted by said counting means has reached a predetermined number. - View Dependent Claims (11, 12)
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13. An automatic sheet feeding device, comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; detection means for detecting a feeding error; pressing means for pressing against the stack of sheets when the feeding error is detected by said detection means, thereby urging the stack of sheets against said feeding means; recording means for recording an operation time of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when said feeding means operates, without regard to detection of the feeding error, whenever the operation time of the pressing means recorded by said recording means has reached a predetermined time. - View Dependent Claims (14, 15)
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17. An image forming apparatus having an image forming means and an automatic sheet feeding device, said automatic sheet feeding device comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; pressing means for pressing against the stack of sheets after a start of a sheet feeding operation, thereby urging the stack of sheets against said feeding means; recording means for recording a number of operations of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when the sheet feeding operation of the feeding means starts after the number of operations of the pressing means recorded by said recording means has reached a predetermined number.
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18. An image forming apparatus having an image forming means and an automatic sheet feeding device, said automatic sheet feeding device comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; pressing means for pressing against the stack of sheets after a start of a sheet feeding operation, thereby urging the stack of sheets against said feeding means; recording means for recording a number of operations of said pressing means, said recording means recording the number of operations of said pressing means by accumulating operating time of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when a sheet feeding operation of the feeding means starts after the number of operations of the pressing means recorded by said recording means has reached a predetermined number.
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19. An image forming apparatus having an image forming means and an automatic sheet feeding device, said automatic sheet feeding device comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; detection means for detecting a feeding error; pressing means for pressing against the stack of sheets when the feeding error is detected by said detection means, thereby urging the stack of sheets against said feeding means; counting means for counting a number of operations of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when said feeding means operates, without regard to detection of the feeding error, whenever the number of operations of the pressing means counted by said counting means has reached a predetermined number.
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20. An image forming apparatus having an image forming means and an automatic sheet feeding device, said automatic sheet feeding device comprising:
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mounting means for mounting a stack of sheets; feeding means for feeding each sheet of the stack of sheets from the stack; detection means for detecting a feeding error; pressing means for pressing against the stack of sheets when the feeding error is detected by said detection means, thereby urging the stack of sheets against said feeding means; recording means for recording an operation time of said pressing means; and control means for controlling operation of said pressing means, wherein said control means causes said pressing means to press against the stack when said feeding means operates, without regard to detection of the feeding error, whenever the operation time of the pressing means recorded by said recording means has reached a predetermined time.
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Specification