Auto document feeder, scanner including the same, and method of controlling auto document feeding

Patent metadata

Field	Value
Publication number	US-9296580-B2
Application number	US-201414330162-A
Country	US
Kind code	B2
Filing date	Jul 14, 2014
Priority date	Jul 12, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

Provided are an auto document feeder (ADF), a scanner including the ADF, and a method of controlling auto document feeding. The ADF includes: a feed unit picking up a sheet of paper and carrying the sheet of paper to a scan unit; a feed control unit controlling the feed unit; and a retry control unit. If a sheet of paper is not normally picked up by the feed unit, the retry control unit decreases a speed of a motor driving the feed unit or increases a current supplied to the motor for picking up the sheet of paper. Therefore, although sheets of paper are not normally fed when a user intends to use various kinds of sheets of paper with the ADF, the retry control unit may stabilize feeding of the feeding of the sheets of paper. Thus, efficient, convenient, and high-quality paper feeding may be possible.

First claim

What is claimed is:

1. An ADF (auto document feeder) comprising:
a feeder configured to pick up a sheet of paper and carry the sheet of paper to a scanner;
a feed controller configured to control the feeder; and
a retry controller, wherein if the sheet of paper is not normally picked up by the feeder, the retry controller decreases a speed of a motor driving the feeder and increases a current supplied to the motor for picking up the sheet of paper,
wherein the feeder includes a first sensor and the scanner includes a second sensor, and
wherein if the sheet of paper is within a paper distance defined from the first sensor indicating whether the sheet of paper is normally picked up to the second sensor indicating a start of image scanning, the retry controller reduces the increased current supplied to the motor to a first original value and increases the decreased speed of the motor to a second original value.

2. The ADF of claim 1 , wherein:
the feeder further comprises:
a pickup roller configured to pick up the sheet of paper, and
a feed roller configured to carry the sheet of paper passing the first sensor to the scanner; and
the first sensor indicates whether the sheet of paper is normally picked up.

3. An ADF (auto document feeder) comprising:
a feeder configured to pick up a sheet of paper and carry the sheet of paper to a scanner;
a feed controller configured to control the feeder; and
a retry controller, wherein if the sheet of paper is not normally picked up by the feeder, the retry controller decreases a speed of a motor driving the feeder and increases a current supplied to the motor for picking up the sheet of paper,
wherein the retry controller comprises:
a motor current controller configured to vary the current supplied to the motor driving the feeder, wherein if the sheet of paper is not normally picked up by the feeder, the motor current controller increases the current supplied to the motor;
a motor speed controller configured to maintain or vary the speed of the motor, wherein if the sheet of paper is not normally picked up by the feeder, the motor speed controller decreases the speed of the motor; and
a paper distance controller, wherein a paper distance is defined as a distance between a first sensor indicating whether the sheet of paper is normally picked up and a second sensor indicating a start of image scanning, and wherein if the sheet of paper is within the paper distance, the paper distance controller reduces the current increased and supplied to the motor to a first original value and increases the decreased speed of the motor to a second original value.

4. The ADF of claim 3 , wherein the paper distance controller reduces the current increased and supplied to the motor to the first original value and increases the decreased speed of the motor to the second original value before the scanner scans the image of the sheet of paper.

5. A scanning apparatus comprising:
a scanner configured to scan an image of a sheet of paper;
a scan controller configured to control an image scanning operation of the scanner;
a feeder configured to pick up the sheet of paper and carry the sheet of paper to the scanner;
a feed controller configured to control the feeder; and
a retry controller, wherein if the sheet of paper is not normally picked up by the feeder, the retry controller decreases a speed of a motor driving the feeder and increases a current supplied to the motor for picking up the sheet of paper,
wherein the feeder includes a first sensor and the scanner includes a second sensor, and
wherein if the sheet of paper is within a paper distance defined from the first sensor indicating whether the sheet of paper is normally picked up to the second sensor indicating a start of image scanning, the retry controller reduces the increased current supplied to the motor to a first original value and increases the decreased speed of the motor to a second original value.

6. The scanning apparatus of claim 5 , wherein:
the feeder further comprises:
a pickup roller configured to pick up the sheet of paper, and
a feed roller configured to carry the sheet of paper passing the first sensor to the scanner; and
the first sensor indicates whether the sheet of paper is normally picked up.

7. The scanning apparatus of claim 5 , wherein:
the scanner comprises:
a scan roller configured to carry picked-up sheet of paper for a scanning process, and
an exit roller configured to discharge the sheet of paper passing the second sensor; and
the second sensor is configured to detect the sheet of paper carried by the scan roller and to indicate a start of image scanning upon detection of the sheet of paper.

8. The scanning apparatus of claim 5 , wherein the motor comprises:
a first motor configured to drive the feeder; and
a second motor configured to drive the scanner.

9. A scanning apparatus comprising:
a scanner configured to scan an image of a sheet of paper;
a scan controller configured to control an image scanning operation of the scanner;
a feeder configured to pick up the sheet of paper and carry the sheet of paper to the scanner;
a feed controller configured to control the feeder; and
a retry controller, wherein if the sheet of paper is not normally picked up by the feeder, the retry controller decreases a speed of a motor driving the feeder-e-r and increases a current supplied to the motor for picking up the sheet of paper,
wherein the retry controller comprises:
a motor current controller configured to vary the current supplied to the motor driving the feeder, wherein if the sheet of paper is not normally picked up by the feeder, the motor current controller increases the current supplied to the motor;
a motor speed controller configured to maintain or vary the speed of the motor, wherein if the sheet of paper is not normally picked up by the feeder, the motor speed controller decreases the speed of the motor; and
a paper distance controller, wherein a paper distance is a distance between a first sensor indicating whether the sheet of paper is normally picked up and a second sensor indicating a start of image scanning, and if the sheet of paper is within the paper distance, the paper distance controller reduces the current increased and supplied to the motor to a first original value and increases the decreased speed of the motor to a second original value.

10. The scanning apparatus of claim 9 , wherein the paper distance controller reduces the current increased and supplied to the motor to the first original value and increases the decreased speed of the motor to the second original value before the scanner scans the image of the sheet of paper.

11. An image forming apparatus comprising:
an image forming unit configured to form an image on a sheet of paper;
an image forming controller configured to control an image forming operation of the image forming unit;
a feeder configured to pick up the sheet of paper and carry the sheet of paper to the image forming unit by way of a scanner;
a feed controller configured to control the feeder; and
a retry controller, wherein if the sheet of paper is not normally picked up by the feeder, the retry controller decreases a speed of a motor driving the feeder and increases a current supplied to the motor for picking up the sheet of paper,
wherein the feeder includes a first sensor and the scanner includes a second sensor, and
wherein if the sheet of paper is within a paper distance defined from the first sensor indicating whether the sheet of paper is normally picked up to the second sensor indicating a start of image scanning, the retry controller reduces the increased current supplied to the motor

Assignees

• Samsung Electronics Co Ltd

Inventors

• Sung Byung-Jun

Classifications

• B65H7/06 Primary

  responsive to presence of faulty articles or incorrect separation or feed (B65H7/14 takes precedence) · CPC title

• B65H7/14

  by photoelectric feelers or detectors · CPC title

• H04N1/00652 Primary

  Control of feeding speed, e.g. fast feeding to scanning position (H04N1/00673 takes precedence) · CPC title

• B65H7/20

  Controlling associated apparatus · CPC title

• G03G21/00 Primary

  Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge · CPC title