Image reading apparatus

Patent metadata

Field	Value
Publication number	US-10142503-B2
Application number	US-201715628041-A
Country	US
Kind code	B2
Filing date	Jun 20, 2017
Priority date	Jun 28, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A feed detection unit which detects a document which is fed is provided at a position between a pinching position at which a feed roller and a frictional force application portion pinch the document and an intersecting position at which a tangential line of the feed roller which is closer to a downstream side in a transport direction than the pinching position is perpendicular to a transport path in the transport direction, which is a different position from the feed roller in a width direction which intersects the transport direction.

First claim

What is claimed is:

1. An image reading apparatus comprising:
a feed unit which includes a feed roller which feeds a medium from a placement portion on which the medium is placed toward a transport path, and a frictional force application portion which applies a frictional force to an opposite side from a transport direction between the frictional force application portion and the medium which is fed by the feed roller;
a feed detection unit which detects the medium which is fed by the feed unit; and
a reading unit which reads an image of the medium which is transported along the transport path from an upstream side toward a downstream side in the transport direction,
wherein at least a portion of the feed detection unit and a detection region of the feed detection unit are provided at a position between a pinching position and an intersecting position in the transport direction, the pinching position being a position at which the feed roller and the frictional force application portion pinch the medium, the intersecting position being a position at which a common tangential line [Ng] which is in contact with a side surface of the feed roller and a side surface of the frictional force application portion on the downstream side of the pinching position in the transport direction intersects the transport path, at least the portion of the feed detection unit and the detection region of the feed detection unit being provided at a position which is a different position from the feed roller in a width direction which intersects the transport direction.

2. The image reading apparatus according to claim 1 , further comprising:
a transport roller which transports the medium along the transport direction,
wherein the feed detection unit is provided at a position closer to the upstream side in the transport direction than the transport roller.

3. The image reading apparatus according to claim 1 , further comprising:
a multi-feed detection unit which detects multi-feed of the medium,
wherein the feed detection unit is provided at a position closer to the upstream side in the transport direction than the multi-feed detection unit.

4. The image reading apparatus according to claim 3 ,
wherein the multi-feed detection unit is provided on one side and the feed detection unit is provided on the other side in the width direction to interpose a center of the transport path.

5. The image reading apparatus according to claim 1 , further comprising:
a housing portion which houses the feed roller,
wherein the feed detection unit is provided in a different position from the housing portion.

6. The image reading apparatus according to claim 1 ,
wherein a drive force transmission unit which transmits a drive force of a drive source to the feed roller is provided on one side and the feed detection unit is provided on the other side in the width direction to interpose a center of the transport path.

7. The image reading apparatus according to claim 1 ,
wherein the feed detection unit is provided at a position which is greater than or equal to 35 mm and less than or equal to 40 mm from a center of the transport path in the width direction.

8. An image reading apparatus comprising:
a feed unit which feeds a medium from a placement portion on which the medium is placed toward a transport path;
a feed detection unit which detects the medium which is fed by the feed unit;
a transport detection unit which detects the medium which is transported along the transport path from an upstream side toward a downstream side in a transport direction;
a reading unit which reads an image of the medium which is transported; and
a control unit which controls driving of the feed unit,
wherein the feed detection unit and the transport detection unit output a detection signal in which the medium is detected and a non-detection signal in which the medium is not detected,
wherein in a case in which a discharge number which is a number of times the feed detection unit outputs the non-detection signal is less than or equal to one time in a duration from when the feed detection unit outputs the detection signal until when the transport detection unit outputs the detection signal, the control unit drives the feed unit when the feed detection unit outputs the non-detection signal after the transport detection unit outputs the detection signal, and in a case in which the discharge number is greater than or equal to two times, the control unit drives the feed unit when the transport detection unit outputs the non-detection signal.

9. The image reading apparatus according to claim 8 ,
wherein the feed detection unit is provided in a different position from a center of the transport path in a width direction which intersects the transport direction.

10. The image reading apparatus according to claim 8 ,
wherein the feed detection unit includes a light emitting unit which emits light and a light receiving unit which receives the light which is emitted from the light emitting unit, and
wherein the transport detection unit includes a contact portion which comes into contact with the medium.

11. The image reading apparatus according to claim 8 ,
wherein the feed detection unit and the transport detection unit are provided in different positions in a width direction which intersects the transport direction.

12. The image reading apparatus according to claim 8 ,
wherein the feed detection unit is provided at a position which is greater than or equal to 35 mm and less than or equal to 40 mm from a center of the transport path in a width direction which intersects the transport direction.

13. An image reading apparatus comprising:
a feed unit which includes a feed roller which feeds a medium from a placement portion on which the medium is placed toward a transport path, and a frictional force application portion which applies a frictional force to an opposite side from a feed direction between the frictional force application portion and the medium which is fed by the feed roller;
a feed detection unit which is provided closer to a downstream side in the feed direction than the frictional force application portion and which detects the medium which is fed by the feed unit;
a transport roller which transports the medium which is fed by the feed unit from an upstream side to a downstream side in a transport direction;
a reading unit which reads an image of the medium which is transported by the transport roller; and
a control unit which controls driving of the transport roller,
wherein the control unit decelerates a transport speed at which the transport roller transports the medium when the feed detection unit detects a rear end of the medium.

14. The image reading apparatus according to claim 13 ,
wherein the control unit accelerates the transport speed once the rear end of the medium passes the reading unit.

15. The image reading apparatus according to claim 13 , further comprising:
a transport detection unit which is provided at a position between the feed detection unit and the reading unit in the transport direction, and which detects the medium which is transported; and
a rotation detection unit which detects a number of rotations of the transport roller,
wherein the control unit accelerates the transport speed once the number of rotations which is detected by the rotation detection unit exceeds a predetermined number of times after the transport detection unit detects the rear end of the medium.

16. The image reading apparatus according to claim 13 , further comprising:
a discharge roller which discharges

Assignees

• Seiko Epson Corp

Inventors

• Kanamitsu Masatomo
• Murahashi Kenichi
• Beppu Wataru

Classifications

• B65H2511/515

  Absence · CPC title

• B65H7/14

  by photoelectric feelers or detectors · CPC title

• B65H2553/82

  with regard to the direction of transport of the handled material · CPC title

• B65H5/062

  between rollers or balls · CPC title

• H04N1/00602 Primary

  Feed rollers · CPC title