Sheet feeding apparatus, image rading apparatus, and method of detecting double feed
First Claim
1. A sheet feeding apparatus, comprising:
- a stacker for storing a sheet, a transport guide for guiding the sheet from the stacker to a processing position, a first transport device disposed at the transport guide for nipping and transporting the sheet, a second transport device disposed at the transport guide at a position away from the first transport device for nipping and transporting the sheet, a double feed detection device disposed between the first transport device and the second transport device for detecting a double feed of sheets, a sheet end detection device disposed at a downstream side of the first transport device for detecting a trailing end of the sheet, and a determination device electrically connected to the double feed detection device and the sheet end detection device for determining the double feed based on a detection signal from the double feed detection device and a detection signal from the sheet end detection device.
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Accused Products
Abstract
A sheet feeding apparatus includes first and second transport devices disposed at a transport guide with a distance in between for nipping and transporting a sheet, and a double feed detection device disposed between the first transport device and the second transport device for detecting a double feed of the sheet. A sheet end detection device is disposed at a downstream side of the first transport device for detecting a trailing end of the sheet, and a determination device is provided for determining the double feed based on a detection signal from the double feed detection device and a detection signal from the sheet end detection device.
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Citations
15 Claims
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1. A sheet feeding apparatus, comprising:
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a stacker for storing a sheet, a transport guide for guiding the sheet from the stacker to a processing position, a first transport device disposed at the transport guide for nipping and transporting the sheet, a second transport device disposed at the transport guide at a position away from the first transport device for nipping and transporting the sheet, a double feed detection device disposed between the first transport device and the second transport device for detecting a double feed of sheets, a sheet end detection device disposed at a downstream side of the first transport device for detecting a trailing end of the sheet, and a determination device electrically connected to the double feed detection device and the sheet end detection device for determining the double feed based on a detection signal from the double feed detection device and a detection signal from the sheet end detection device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sheet feeding apparatus, comprising:
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a stacker for storing a sheet, a transport guide for guiding the sheet from the stacker to a processing position, a first transport device disposed at the transport guide for nipping and transporting the sheet, a second transport device disposed at the transport guide at a position away from the first transport device for nipping and transporting the sheet, a double feed detection device disposed between the first transport device and the second transport device for detecting a double feed of the sheet and having a wave transmission element for transmitting an ultrasonic wave with a specific frequency over a measurement range with a predetermined length extending in a direction that the sheet is transported and a wave reception element for receiving the ultrasonic wave from the wave transmission element, a sheet end detection device disposed on the transport guide at a downstream side of the first transport device for detecting a trailing end of the sheet, and a determination device electrically connected to the double feed detection device and the sheet end detection device for determining the double feed based on an output signal from the double feed detection device and an output signal from the sheet end detection device, said determination device dividing the output signal from the wave reception element over the measurement range into a plurality of divided signals and comparing the divided signals with predetermined reference values to obtain comparison data so that the determination device determines the double feed based on the comparison data when a transport length of the sheet during periods from the divided signals until the sheet end detection device detects the trailing end of the sheet is greater than a predetermined length.
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12. An image reading apparatus, comprising:
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a stacker for storing a sheet, a transport guide for guiding the sheet from the stacker to a reading platen, a separation roller for separating and feeding the sheet from the stacker, a register roller for temporarily setting the sheet from the separation roller in a standby state, a double feed detection device disposed between the separation roller and the register roller for detecting a double feed of the sheet, a sheet end detection device disposed between the double feed detection device and the register roller for detecting a leading end and a trailing end of the sheet, and a determination device electrically connected to the double feed detection device and the sheet end detection device for determining the double feed based on a detection signal from the double feed detection device and a detection signal from the sheet end detection device, said determination device including a first comparison device for comparing the detection signal from the double feed detection device with a predetermined reference value in a condition that the register roller nips the leading end of the sheet based on the detection signal from the sheet end detection device, and a second comparison device for comparing a transport length of the sheet for a period from when the double feed detection device sends the detection signal to when the sheet end detection device detects the trailing end of the sheet with a predetermined length. - View Dependent Claims (13)
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14. A method of detecting a double feed of a sheet, comprising:
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detecting a double feed of a sheet during a process of transporting the sheet from a first transport device to a second transport device, measuring a transport length of the sheet for a period from when the double feed is detected in the detecting step to when a trailing end of the sheet reaches the predetermined position, and determining the double feed by validating detection data obtained in the detecting step when the transport length of the sheet measured in the measuring step is greater than a predetermined length. - View Dependent Claims (15)
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Specification