Sheet feeding apparatus, image reading apparatus, and method of detecting double feed
First Claim
Patent Images
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 double feed detection device and between the first transport device and the second transport device for detecting a trailing end of the sheet, anda 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 indicating a transport length of the sheet during a period from when the double feed detection device detects the sheet to when the trailing end of the sheet reaches the sheet end detection device.
1 Assignment
0 Petitions
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.
69 Citations
14 Claims
-
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 double feed detection device and between the first transport device and the second 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 indicating a transport length of the sheet during a period from when the double feed detection device detects the sheet to when the trailing end of the sheet reaches the sheet end detection device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An image reading apparatus, comprising:
-
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 at a downstream side of the double feed detection device 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)
-
-
14. A method of detecting a double feed of a sheet, comprising:
-
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 in transporting the sheet between the first and second transport devices 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 based on signals from the double feed and the transport length, the double feed being determined 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, wherein in the measuring step, the transport length of the sheet is measured based on a detection signal from a sheet end detection device disposed between the first and second transport devices for detecting the trailing end of the sheet, and in the determining step, the double feed is determined by validating the detection data obtained in the detecting step when the transport length of the sheet is greater than a length between the first transport device and the sheet end detection device.
-
Specification