Reverse feed and re-feed of document in scanner

1 . A scanner comprising:

a tray to receive a document and to ascend/descend between a first position to feed the document and a second position deviating from the first position;

a reading member to read an image from the document;

a document feeding member to feed the document to the reading member;

a document feed error detection sensor to detect a document feed error caused by the document feeding member; and

a processor, wherein the processor is to:

based on detecting a document feed error by the document feed error detection sensor, move the tray between the first position to the second position and control the document feeding member to perform a reverse feeding operation of feeding an erroneous document toward the tray, and,

based on performing the reverse feeding operation, move the tray between the second position and the first position and control the document feeding member to perform a re-feeding operation of feeding the erroneous document to the reading member.

2 . The scanner of claim 1 ,

wherein the document feeding member comprises a pickup roller to ascend/descend between a third position to pick up a document, and a fourth position deviating from the third position, and

wherein the processor is to control the pickup roller to move to the fourth position before or during the reverse feeding operation.

3 . The scanner of claim 1 ,

wherein the document feed error detection sensor comprises a double-feed detection sensor to detect double feeding of documents, and

wherein, based on detecting double feeding of documents by the double-feed detection sensor, the processor is to identify that there is a document feed error.

4 . The scanner of claim 1 , further comprising an alignment roller to correct skew of the document,

wherein the document feed error detection sensor comprises an alignment sensor located on an upstream side of the alignment roller to detect a document, and

wherein, based on a document not being detected by the alignment sensor within a certain period of time after document feeding is started, the processor is to identify that there is a document feed error.

5 . The scanner of claim 1 , wherein, based on the document feed error not being resolved after performing the reverse feeding operation and the re-feeding operation a reference number of times, the processor is to output an error message through a user interface device.

6 . The scanner of claim 1 , wherein the document feed error detection sensor is to detect the document feed error between the document feeding member and the reading member.

7 . The scanner of claim 1 ,

wherein the document feeding member comprises a feed roller and a retard roller to engage with each other to form a nip and separate and feed picked-up documents one-by-one, and

wherein the document feed error detection sensor comprises a double-feed detection sensor located on a downstream side of the nip to detect whether documents are being doubly-fed.

8 . The scanner of claim 1 ,

wherein the document feeding member comprises a feed roller and a retard roller to engage with each other to form a nip and separate and feed picked-up documents one-by-one,

wherein the scanner further comprises:

an alignment roller located on a downstream side of the nip to correct skew of a document; and

a pickup sensor located on the downstream side of the nip to detect a document,

wherein the document feed error detection sensor comprises an alignment sensor located between the alignment roller and the pickup sensor to detect a document, and

wherein, based on a document not being detected by the alignment sensor within a certain period of time after a document is detected by the pickup sensor, the processor is to identify that there is a document feed error.

9 . A scanner comprising:

a tray to receive a document and to ascend/descend between a first position to feed the document and a second position deviating from the first position;

a reading member to read an image from the document;

a document feeding member to pick up a document, and feed the document to the reading member comprising a pickup roller to ascend/descend between a third position to pick up a document, and a fourth position deviating from the third position;

a document feed error detection sensor to detect a document feed error caused by the document feeding member; and

a processor, wherein the processor is to:

based on detecting a document feed error by the document feed error detection sensor, move the tray between the first position to the second position and control the document feeding member to perform a reverse feeding operation of feeding an erroneous document toward the tray; and

control the document feeding member to perform a re-feeding operation of feeding the erroneous document to the reading member.

10 . The scanner of claim 9 ,

wherein the processor is to control the pickup roller to move to the fourth position before or during the reverse feeding operation.

11 . The scanner of claim 9 ,

wherein the document feed error detection sensor comprises a double-feed detection sensor to detect double feeding of documents, and

wherein, based on detecting double feeding of documents by the double-feed detection sensor, the processor is to identify that there is a document feed error.

12 . The scanner of claim 9 , further comprising an alignment roller to correct skew of the document,

wherein the document feed error detection sensor comprises an alignment sensor located on an upstream side of the alignment roller to detect a document, and

wherein, based on a document not being detected by the alignment sensor within a certain period of time after document feeding is started, the processor is to identify that there is a document feed error.

13 . The scanner of claim 9 , wherein, based on the document feed error not being resolved after performing the reverse feeding operation and the re-feeding operation a reference number of times, the processor is to output an error message through a user interface device.

14 . The scanner of claim 9 , wherein the document feed error detection sensor is to detect the document feed error between the document feeding member and the reading member.

15 . An apparatus, comprising:

a tray to receive a document and to ascend/descend between a first position to feed the document and a second position deviating from the first position;

a reading member to read an image from the document;

a document feeding member to pick up a document, and feed the document to the reading member comprising a pickup roller to ascend/descend between a third position to pick up a document, and a fourth position deviating from the third position;

a document feed error detection sensor to detect a document feed error caused by the document feeding member; and

a processor, wherein the processor is to:

based on detecting a document feed error by the document feed error detection sensor, move the tray between the first position to the second position and control the document feeding member to perform a reverse feeding operation of feeding an erroneous document toward the tray; and

control the document feeding member to perform a re-feeding operation of feeding the erroneous document to the reading member, wherein the re-feeding operation includes moving the tray from the second position to the first position.

16 . The apparatus of claim 15 ,

wherein the processor is to control the pickup roller to move to the fourth position before or during the reverse feeding operation.

17 . The apparatus of claim 15 ,

wherein the document feed error detection sensor comprises a double-feed detection sensor to detect double feeding of documents, and

wherein, based on detecting double feeding of documents by the double-feed detection sensor, the processor is to identify that there is a document feed error.

18 . The apparatus of claim 15 , further comprising an alignment roller to correct skew of the document,

wherein the document feed error detection sensor comprises an alignment sensor located on an upstream side of the alignment roller to detect a document, and

wherein, based on a document not being detected by the alignment sensor within a certain period of time after document feeding is started, the processor is to identify that there is a document feed error.

19 . The apparatus of claim 15 , wherein, based on the document feed error not being resolved after performing the reverse feeding operation and the re-feeding operation a reference number of times, the processor is to output an error message through a user interface device.

20 . The apparatus of claim 15 , wherein the document feed error detection sensor is to detect the document feed error between the document feeding member and the reading member.