阅读说明：本技术 图像读取装置 (Image reading apparatus ) 是由 手塚诚二 于 2019-07-29 设计创作，主要内容包括：本发明提供读取被输送介质图像的图像读取装置,能够提高图像读取后的介质的可堆叠性。扫描仪(1)具备：读取部(20),读取被输送的介质(P)；排出辊对(17),通过第一辊(21)与第二辊(22)夹持并排出由读取部(20)读取过的介质(P)；以及肋部(23),配置在介质输送方向上与排出辊对(17)重叠的位置,从第一辊(21)及第二辊(22)中的第一辊(21)侧朝着第二辊(22)侧突出,该肋部(23)具备：相对于排出辊对(17)位于与介质输送方向相交的宽度方向的一侧的第一肋部(23a)；以及相对于排出辊对(17)在宽度方向上位于第一肋部(23a)的相反侧的第二肋部(23b)。(The invention provides an image reading apparatus for reading an image of a conveyed medium, which can improve the stackability of the medium after image reading. A scanner (1) is provided with: a reading unit (20) that reads a conveyed medium (P); a discharge roller pair (17) that pinches and discharges the medium (P) read by the reading unit (20) by a first roller (21) and a second roller (22); and a rib (23) that is disposed at a position overlapping the discharge roller pair (17) in the medium conveyance direction and protrudes from the first roller (21) side of the first roller (21) and the second roller (22) toward the second roller (22), the rib (23) comprising: a first rib (23a) located on one side in the width direction intersecting the medium conveyance direction with respect to the discharge roller pair (17); and a second rib (23b) located on the opposite side of the first rib (23a) in the width direction with respect to the discharge roller pair (17).)

1. An image reading apparatus is characterized by comprising:

a reading unit that reads a conveyed medium;

a first discharge roller pair configured to nip the medium read by the reading unit between a first roller and a second roller and discharge the medium;

a second discharge roller pair that is provided at an interval in a width direction intersecting a medium conveyance direction with respect to the first discharge roller pair, and that discharges the medium read by the reading section by nipping the medium between a third roller and a fourth roller;

a first rib portion located on one side in the width direction and protruding from the first roller side toward the second roller side, the first rib portion forming the medium read by the reading portion into a mountain shape and a valley shape; and

a second rib portion located on the opposite side of the first rib portion in the width direction and protruding from the third roller side toward the fourth roller side to form the medium read by the reading portion into a mountain shape and a valley shape,

the first rib is provided at a position overlapping with the first discharge roller pair when the image reading apparatus is viewed from a side surface,

the second rib is provided at a position overlapping with the second discharge roller pair when the image reading apparatus is viewed from the side.

2. The image reading apparatus according to claim 1,

the first rib has a first apex at a front end in the projecting direction,

the second rib has a second apex at a front end in the projecting direction,

the first crest is provided at a first position beyond a first nip position of the first discharge roller pair in a direction in which the first rib protrudes,

the second apex portion is provided at a second position beyond a second nip position of the second discharge roller pair in a direction in which the second rib portion protrudes.

3. The image reading apparatus according to claim 1 or 2,

the first discharge roller pair and the second discharge roller pair are both disposed between the first rib and the second rib.

4. The image reading apparatus according to claim 3,

the first discharge roller pair and the second discharge roller pair are provided with third ribs that protrude in a direction opposite to a protruding direction of the first ribs and the second ribs.

5. The image reading apparatus according to claim 1,

the first rib is provided on either one of a rotation axis of the first roller and a rotation axis of the second roller,

the second rib is provided on either one of the rotation axis of the third roller and the rotation axis of the fourth roller.

6. The image reading apparatus according to claim 2,

the first rib is configured to be displaceable between the first position and a third position retracted from the medium conveyance path without contacting the conveyed medium,

the second rib is configured to be displaceable between the second position and a fourth position retracted from the medium conveyance path without contacting the conveyed medium.

7. The image reading apparatus according to claim 6,

the image reading apparatus includes a control unit that controls displacement of the first rib and the second rib,

the control unit controls displacement of the first rib and the second rib according to the rigidity of the medium.

8. The image reading apparatus according to claim 7,

the image reading apparatus includes a medium detecting section,

the medium detection unit is provided upstream of the reading unit and includes:

a transmission unit for transmitting ultrasonic waves; and

a receiving unit that receives the ultrasonic waves transmitted from the transmitting unit and outputs output values corresponding to the received ultrasonic waves,

the control unit controls the first rib and the second rib based on a detection result of the medium detection unit.

9. The image reading apparatus according to claim 7 or 8,

the control unit controls the first rib and the second rib based on a reading result of the reading unit.

10. An image reading apparatus is characterized by comprising:

a reading unit that reads a conveyed medium;

a discharge roller pair configured to nip the medium read by the reading unit between a first roller and a second roller and discharge the medium;

a first rib portion located on one side in a width direction intersecting a medium conveyance direction with respect to the discharge roller pair, protruding from the first roller side toward the second roller side, and forming the medium read by the reading portion into a mountain shape and a valley shape; and

a second rib portion located on the opposite side of the first rib portion in the width direction with respect to the discharge roller pair, protruding from the first roller side toward the second roller side, and forming the medium read by the reading portion into a mountain shape and a valley shape,

the first rib and the second rib are provided at positions overlapping with the pair of discharge rollers when the image reading apparatus is viewed from the side.

11. The image reading apparatus according to claim 10,

the first rib has a first apex at a tip in the projecting direction,

the second rib has a second apex at the front end in the protruding direction,

the first apex portion is provided at a first position beyond a nip position of the pair of discharge rollers in a direction in which the first rib portion protrudes,

the second apex portion is provided at a second position beyond a nip position of the discharge roller pair in a direction in which the second rib portion protrudes.

Technical Field

The present invention relates to an image reading apparatus that reads an image.

Background

A scanner, which is an example of an image reading apparatus, is provided with an automatic document feeder, and may be configured to be capable of automatically feeding and reading a plurality of documents. The automatic conveying device is also sometimes called an ADF (Auto document feeder).

The plurality of documents conveyed are read by a reading unit provided downstream in the conveying direction of the automatic conveying apparatus.

In such a scanner, a discharge roller is provided downstream of the reading section, and the originals are discharged to the outside of the apparatus and stacked in the order of discharge. Patent document 1 is an example of a scanner having such a configuration.

Patent document 1: japanese patent laid-open publication No. 2011-043732

Disclosure of Invention

Here, the original discharged by the discharge roller may curl. When reading a plurality of documents in an image reading apparatus, if a document read first is discharged in a curled state, the following documents may jam or the discharged documents may be loaded out of order, resulting in a decrease in stackability.

In particular, such a problem is likely to occur when the original is a thin medium having low rigidity or a medium originally formed with creases, wrinkles, or the like.

Patent document 1 discloses that stackability is improved by reducing the discharge speed of the discharge rollers. However, there may be a medium that is easily curled, which cannot be dealt with only by reducing the discharge speed.

An image reading apparatus according to the present invention for solving the above problems includes: a reading unit that reads a conveyed medium; a discharge roller pair configured to nip and discharge the medium read by the reading unit by a first roller and a second roller; a first rib that is disposed at a position overlapping the discharge roller pair in the medium conveying direction and protrudes from one roller side of the first roller and the second roller toward the other roller side, and that is located on one side in a width direction intersecting the medium conveying direction with respect to the discharge roller pair; and a second rib located on an opposite side of the discharge roller pair from the first rib in the width direction.

Drawings

Fig. 1 is an external perspective view showing a scanner according to a first embodiment.

Fig. 2 is a side sectional view showing a medium conveyance path in the scanner relating to the first embodiment.

Fig. 3 is a schematic side sectional view of the periphery of the discharge roller pair.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a diagram illustrating the posture of the medium discharged by the discharge roller pair.

Fig. 6 is a diagram illustrating the displacement unit.

Fig. 7 is a flowchart illustrating control based on the detection result of the medium detecting unit.

Fig. 8 is a flowchart for explaining control based on the reading result of the reading unit.

Fig. 9 is a view illustrating a rib according to the second embodiment.

Fig. 10 is a diagram illustrating a modification of the second embodiment.

Fig. 11 is a view illustrating a rib according to a third embodiment.

Description of the figures

1 … document scanner (image reading apparatus), 2 … frame, 3 … lower unit, 4 … upper unit, 5 … discharge tray, 6 … supply port, 7 … operation panel, 8 … first auxiliary sheet support, 9 … second auxiliary sheet support, 10 … medium conveyance path, 11 … medium placement portion, 12a … second edge guide, 12b … first edge guide, 13a … guide surface, 13b … guide surface, 14 … supply roller, 15 … separation roller, 16 … conveyance roller pair, 17 … discharge roller pair, 18 … discharge port, 19 … control portion, 20 … reading portion, 20a … upper reading sensor, 20b … lower reading sensor, 21a, 21b … first roller, 22a, 22b … second roller, 23 …, 23a … first rib portion, 23b … second rotation shaft …, … rib portion, 26 … second rotation axis, 27 … extension spring, 28 … displacement unit, 29 … contact, 30 … media detection, 31 … transmission, 32 … reception, 33 … top, 34 … ramp, 35 … contacted, 36 … third rib, 40a … first rib, 40b … second rib, 41 … third rib, P … media.

An image reading apparatus according to an embodiment includes: a reading unit that reads a conveyed medium; a first discharge roller pair configured to nip the medium read by the reading unit between a first roller and a second roller and discharge the medium; a second discharge roller pair that is provided at an interval in a width direction intersecting a medium conveyance direction with respect to the first discharge roller pair, and that discharges the medium read by the reading section by nipping the medium between a third roller and a fourth roller; a first rib portion located on one side in the width direction and protruding from the first roller side toward the second roller side, the first rib portion forming the medium read by the reading portion into a mountain shape and a valley shape; and a second rib portion that is located on the opposite side of the first rib portion in the width direction and protrudes from the third roller side toward the fourth roller side, the medium read by the reading portion being formed into a mountain shape and a valley shape, the first rib portion being provided at a position overlapping with the first discharge roller pair when the image reading apparatus is viewed from the side, and the second rib portion being provided at a position overlapping with the second discharge roller pair when the image reading apparatus is viewed from the side.