Image reading apparatus

• US 10,447,876 B2
• Filed: 06/16/2017
• Issued: 10/15/2019
• Est. Priority Date: 06/30/2016
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hamada, Kaoru, Oka, Yushi, Furukawa, Masato, Shibaki, Seiji
• Primary Examiner(s): Lee, Cheukfan
• Application Number:
  US15/625,963
• Publication Number:
  US 20180007223A1
• Time in Patent Office: 851 Days
• Field of Search: 358498, 358496, 358488
• CPC Class Codes: H04N 1/00034 Measuring, i.e. determining a quantity by comparison with a standard H04N1/00031 takes precedence
• CPC Class Codes: H04N 1/00602 Feed rollers
• CPC Class Codes: H04N 1/00604 Transport trays
• CPC Class Codes: H04N 1/00801 according to characteristics of the original
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays
• CPC Class Codes: H04N 1/3878 Skew detection or correction
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence

Abstract

An image reading apparatus, including: a first distance detector configured to measure a first distance of the original conveyed after a sensor is changed from a first state detecting the original to a second state not detecting the original; a second distance detector configured to measure a second distance of the original conveyed after the second state is changed to the first state; and a controller configured to control a conveyor so that the conveyor starts a conveyance of a succeeding original when the second distance reaches a conveyance permission distance before the first distance reaches a hole detection distance and the conveyor stops the succeeding original when the second state is changed to the first state before the first distance reaches the hole detection distance, and thereafter starts the conveyance of the succeeding original when the first distance reaches the hole detection distance.

Claims

1. An image reading apparatus, comprising:

an image sensor configured to read an image on an original;

an original tray on which the original is to be placed;

a conveyor configured to convey the original placed on the original tray to a reading position in which the image sensor reads the original;

an original length obtaining unit configured to obtain a length, in a conveyance direction, of the original that is placed on the original tray before the original is conveyed by the conveyor;

an original sensor provided between the original tray and the reading position and configured to assume a first state when the original sensor detects the original that is being conveyed by the conveyor and assume a second state when the original sensor does not detect the original;

a first distance detector configured to measure a first conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the first state to the second state;

a second distance detector configured to measure a second conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the second state to the first state before the original sensor is changed from the first state to the second state; and

a controller configured to control the conveyor so that;

the conveyor starts a conveyance of a succeeding original in a case where the succeeding original is on the original tray when the second conveyance distance reaches a second distance while the original sensor remains in the second state after the original sensor changes from the first state to the second state and before the first conveyance distance reaches a first distance, the second distance being a length obtained by adding a margin to the length of the original obtained by the original length obtaining unit, the first distance being longer than a size of a punch hole provided in the original and shorter than an interval in which a plurality of originals are conveyed; and

the conveyor suspends the conveyance of the succeeding original in a case where the original sensor changes from the second state to the first state after the conveyance of the succeeding original is started and before the first conveyance distance reaches the first distance, and thereafter restarts the conveyance of the succeeding original when the first conveyance distance reaches the first distance after the original sensor changes again from the first state to the second state.

2. The image reading apparatus according to claim 1, wherein the controller controls the conveyor so that the conveyor starts the conveyance of the succeeding original by the conveyor in a case where the succeeding original is on the original tray when the first conveyance distance reaches the first distance before the second conveyance distance reaches the second distance.

3. The image reading apparatus according to claim 1, further comprising a memory configured to store the first distance.

4. The image reading apparatus according to claim 1, wherein the original sensor outputs a high level voltage or current signal when the original sensor is in the first state, and outputs a low level voltage or current signal when the original sensor is in the second state.

5. An image reading apparatus, comprising:

an image sensor configured to read an image on an original;

an original tray on which the original is to be placed;

a conveyor configured to convey the original placed on the original tray to a reading position in which the image sensor reads the original;

an original length obtaining unit configured to obtain a length, in a conveyance direction, of the original that is placed on the original tray before the original is conveyed by the conveyor;

a first original sensor provided between the original tray and the reading position and configured to assume a first state when the first original sensor detects the original that is being conveyed by the conveyor and assume a second state when the first original sensor does not detect the original;

a second original sensor provided downstream of the first original sensor in the conveyance direction of the original between the original tray and the reading position and configured to assume a first state when the second original sensor detects the original that is being conveyed by the conveyor and assume a second state when the second original sensor does not detect the original;

a first distance detector configured to measure a first conveyance distance of the original by which the original has been conveyed from a time when the first original sensor is changed from the first state to the second state;

a second distance detector configured to measure a second conveyance distance of the original by which the original has been conveyed from a time when the second original sensor is changed from the second state to the first state before the first original sensor is changed from the first state to the second state; and

a controller configured to control the conveyor so that;

the conveyor starts a conveyance of a succeeding original in a case where the succeeding original is on the original tray when the second conveyance distance reaches a second distance while the first original sensor remains in the second state after the first original sensor changes from the first state to the second state and before the first conveyance distance reaches a first distance, the second distance being a length obtained by adding a margin to the length of the original obtained by the original length obtaining unit, the first distance being longer than a size of a punch hole provided in the original and shorter than an interval in which a plurality of originals are conveyed; and

the conveyor suspends the conveyance of the succeeding original in a case where the first original sensor changes from the second state to the first state after the conveyance of the succeeding original is started and before the first conveyance distance reaches the first distance, and thereafter restarts the conveyance of the succeeding original when the first conveyance distance reaches the first distance after the first original sensor changes again from the first state to the second state.

6. The image reading apparatus according to claim 5, further comprising a memory configured to store the first distance.

7. The image reading apparatus according to claim 5,

wherein the first original sensor or the second original sensor outputs a high level voltage or current signal when the first original sensor or the second original sensor is in the first state, and

wherein the first original sensor or the second original sensor outputs a low level voltage or current signal when the first original sensor or the second original sensor is in the second state.

8. The image reading apparatus according to claim 6, further comprising a registration roller pair configured to correct a skew feed of the original,

wherein the second original sensor is provided downstream of the registration roller pair in the conveyance direction.

9. An image reading apparatus, comprising:

an image sensor configured to read an image on an original;

an original tray on which the original is to be placed;

a conveyor configured to convey the original placed on the original tray to a reading position in which the image sensor reads the original;

an original length obtaining unit configured to obtain a length, in a conveyance direction, of the original that is placed on the original tray before the original is conveyed by the conveyor;

an original sensor provided between the original tray and the reading position and configured to assume a first state when the original sensor detects the original that is being conveyed by the conveyor and assume a second state when the original sensor does not detect the original;

a first distance detector configured to measure a first conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the first state to the second state;

a second distance detector configured to measure a second conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the second state to the first state before the original sensor is changed from the first state to the second state; and

a controller configured to control the conveyor so that;

the conveyor starts a conveyance of a succeeding original in a case where the second conveyance distance reaches a second distance before the original sensor changes from the first state to the second state and thereafter the original sensor changes from the first state to the second state, the second distance being a length obtained by adding a margin to the length of the original obtained by the original length obtaining unit;

the conveyor suspends the conveyance of the succeeding original in a case where the original sensor changes from the second state to the first state after the conveyance of the succeeding original is started and before the first conveyance distance reaches a first distance, the first distance being longer than a size of a punch hole provided in the original and shorter than an interval in which a plurality of originals are conveyed; and

the conveyor restarts the conveyance of the succeeding original in a case where the first conveyance distance reaches the first distance after the conveyance of the succeeding original is suspended.

10. An image reading apparatus, comprising:

an image sensor configured to read an image on an original;

an original tray on which the original is to be placed;

a conveyor configured to convey the original placed on the original tray to a reading position in which the image sensor reads the original;

an original length obtaining unit configured to obtain a length, in a conveyance direction, of the original that is placed on the original tray before the original is conveyed by the conveyor;

an original sensor provided between the original tray and the reading position and configured to assume a first state when the original sensor detects the original that is being conveyed by the conveyor and assume a second state when the original sensor does not detect the original;

a first distance detector configured to measure a first conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the first state to the second state;

a second distance detector configured to measure a second conveyance distance of the original by which the original has been conveyed from a time when the original sensor is changed from the second state to the first state before the original sensor is changed from the first state to the second state; and

a controller configured to control the conveyor so that;

the conveyor starts a conveyance of a succeeding original if the original sensor does not change from the second state to the first state when the first conveyance distance reaches a first distance in a case where the original sensor changes from the first state to the second state before the second conveyance distance reaches a second distance and thereafter the second conveyance distance does not reach the second distance when the first conveyance distance reaches the first distance, the second distance being a length obtained by adding a margin to the length of the original obtained by the original length obtaining unit, the first distance being longer than a size of a punch hole provided in the original and shorter than an interval in which a plurality of originals are conveyed; and

the conveyor does not start the conveyance of the succeeding original even if the original sensor changes from the second state to the first state before the first conveyance distance reaches the first distance in a case where the original sensor changes from the first state to the second state before the second conveyance distance reaches the second distance and thereafter the second conveyance distance does not reach the second distance when the first conveyance distance reaches the first distance, and thereafter the conveyor starts the conveyance of the succeeding original when the second conveyance distance reaches the second distance after the original sensor changes from the first state to the second state and before the first conveyance distance reaches the first distance.