JPH05110756A - Picture reader - Google Patents

Abstract

PURPOSE:To read picture information of an original with high accuracy by making a read line of a close contact image sensor coincident with a generatrix of a CS roller pressing the image sensor to a read position. CONSTITUTION:A CS roller 10 is a support member supported freely turnably, a collar 13 having a projection 13a is fitted to both sides of a shaft of the roller 10 and the projection 13a of the collar 13 is fitted so as to be mated to a U groove 9b provided to both ends at the outside of a read enable area of a close contact image sensor 9. Thus, a read line of the close contact image sensor 9 and a generatrix of the CS roller 10 are easily made coincident, and an original is not floated on the read line and the picture information of the original is read with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus such as a facsimile apparatus using a contact type sensor having a shallow depth of field.

[0002]

2. Description of the Related Art Generally, a relatively small image reading apparatus such as a facsimile is a unit, can be downsized, and is easy to maintain and handle. Contact type sensors are often used instead of having a built-in optical system. However, in a contact-type image sensor that does not have a short-focus imaging lens, the depth of field is as shallow as ± 0.1 mm, and reading outside this range is difficult. Therefore, in the image reading apparatus using the perfect contact type image sensor, it is necessary to bring the document surface into close contact with the contact type image sensor.
For example, the one shown in FIG. 4 is known.

FIG. 4 shows a facsimile device as a reading device. In the document reading portion A, a document guide portion 52 for guiding the side portion of a document 51 and an ADF roller 5 are provided.
3a and pressing piece 53b pressed by the ADF roller 53a
Document 51 set on the document guide portion 52 having
And an ADF section 53 for separating the ADF section 53
The feed roller pair 55 including a pair of feed rollers 55a and 55b that feeds the original 51 separated by the above to the perfect contact type image sensor 54, and the original 51 fed by the feed roller pair 55 are brought into complete close contact. It is equipped with a CS roller 56 that is in close contact with the die image sensor 54 so that it does not float above the reading position 54a.

In the document reading section A, the document guide section 52
When the document 51 is set on the top and the reading operation is started, the ADF roller 53a, the feeding roller pair 55, and the CS roller 56 start to rotate by the drive motor (not shown). First ADF
The originals 51 are separated one by one by the section 53, the separated originals 51 are fed to the perfect contact image sensor 54 by the feeding roller pair 55, and the reading position 5 is set by the CS roller 56.
The contact type image sensor 54 reads the image information of the original 51, and the original 51 that has been read is discharged from the discharge port 58 to the outside of the apparatus by the discharge roller pair 57. ..

The CS roller 56 is formed as a white roller, and in the reading operation, the surface of the CS roller 56 is read by the perfect contact type image sensor 54 before the leading edge of the original 51 reaches the reading position 54a. The read data becomes the reference color when reading the original. Also,
The CS roller 56 brings the original 51 into close contact with the reading position 54a of the perfect contact type image sensor 54. Therefore, the original 51 can be brought into close contact with the perfect contact type image sensor 54 regardless of the unevenness of the surface thereof. For,
A cylindrical roller using a rubber material is used (see FIG. 5). Further, the contact type image sensor 54 is a sheet metal 59.
, And the CS roller 56 is attached to the body frame 60 via a bearing (not shown).

[0006]

However, in the above-mentioned conventional example, the reading line of the contact image sensor 54 and C
The relative positional relationship between the S roller 56 and the bus bar is as follows.
It is determined by the precision of the parts such as the bearing 6 and the main body frame 60. Further, as described above, the depth of field of the contact type image sensor 54 is only about ± 0.1 mm, and if the reading line of the contact type image sensor 54 and the bus line of the CS roller 56 are deviated, the document 51 will be a contact type image sensor. There was a flutter on the reading line 54, and there was a possibility that the image information would be blurred and read. Further, in order to prevent the image information from being read out in a blurry manner, the precision of parts such as the sheet metal 59, the bearing of the CS roller 56, and the body frame 60, which relate the relative positions of the contact image sensor 54 and the CS roller 56, to each other. Had to be raised, which was a cause of cost increase.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to make the reading line of the contact image sensor and the bus line of the CS roller coincide with each other.

[0008]

A typical means for solving the above-mentioned problems and applied to the embodiments described below is a reading means for reading image information of an original, and the original is closely pressed to the reading means. And a pressing member for supporting the pressing unit, the positional relationship between the reading unit and the pressing unit provided at a position opposite to the reading unit is positioned by a supporting member for supporting the pressing unit. Characterize.

[0009]

According to the present invention, the positional relationship between the reading means for reading the image information of the original document and the pressing means provided at the opposing position is determined by the support member for supporting the pressing means. As a result, the reading line of the reading unit and the bus bar of the pressing unit can be easily matched.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image reading apparatus to which the present invention is applied will be illustrated and described below with reference to the drawings.

[First Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a reading unit showing a positional relationship between a CS roller and a contact image sensor, and FIG. 2 is a side view showing a partially cutaway view of a facsimile machine. First, the overall structure of the apparatus will be described with reference to FIG. 2. Reference numeral 1 denotes the apparatus main body, whose upper surface cover 1a is inclined so as to be lowered at one end (left side in FIG. 2), and is formed compact as a whole. Has been done. A document reading unit 2 is provided on one end side (the left side in FIG. 2) of the apparatus main body 1, and the document reading unit 2 can slide in the document insertion port 3 and in the document insertion port 3 in the width direction of the document 4. A manuscript guide 5 is provided.

Further, a document feeding path of the document reading section 2,
That is, from the document insertion port 3 to the top cover 1a of the apparatus main body 1.
An ADF roller 7a and a pressing piece 7b which is pressed by the ADF roller 7a are provided between the document discharge port 6 provided at the substantially center and the documents 4 sent from the document guide 5 are separated one by one. ADF unit 7, a feeding unit 8 including a pair of feeding rollers 8a and 8b for feeding the document 4 separated by the ADF unit 7, and image information of the document 4 conveyed from the feeding unit 8. Contact image sensor 9 as reading means for reading
Then, the CS roller 10 as a contact means for adhering the document 4 to the reading position 9a of the contact image sensor 9 while closely contacting the contact image sensor 9 with a predetermined pressing force, and the document 4 after reading. The document delivery port 6 is provided with a delivery section 11 including a pair of delivery rollers 11a and 11b.

The contact-type image sensor 9 is a perfect contact-type image sensor having a very shallow depth of field, which does not have a short-focus imaging lens. In the recording section, or in the copy mode, the other end side of the apparatus body 1 (see FIG.
It is configured so as to transmit to the respective recording units 12 mounted on the right side).

Next, the positional relationship between the contact image sensor 9 and the CS roller 10 will be described with reference to FIG.
U-grooves 9b are provided on both ends of the read line of the contact image sensor 9 and outside the readable area of the contact image sensor 9. Also CS
On the shafts at both ends of the roller 10, a collar 13 which is a supporting member for rotatably supporting the roller 10 is provided. The collar 13 has a convex portion 13a corresponding to at least the width of the U groove 9b and a hole 13b for rotatably supporting the shaft of the CS roller 10, and the center of the hole 13b is It is formed so as to be located on the center line of the convex portion 13a. As shown in FIG. 1, the collar 13 is attached to both sides of the shaft of the CS roller 10, and the protrusions 13a of the collar 13 are attached so as to fit into the U-grooves 9b of the contact image sensor 9. 9
It is possible to always match the reading line of (1) with the bus line of the CS roller 10.

Next, the reading operation of the apparatus will be described. When the document 4 is set on the document guide 5 and a reading start signal is input by an operation switch (not shown), a drive motor (not shown) is driven to rotate the ADF roller 7a, the feeding roller 8a, the discharge roller 11a, and the CS roller 10, respectively. Then, the documents 4 are separated one by one by the ADF unit 7 and conveyed to the feeding unit 8.

Next, when the leading edge of the document 4 is detected by a DES sensor (document leading edge detection sensor) (not shown), the drive motor stops and the ADF roller 7a, the feeding roller 8a,
The rotations of the discharge roller 11a and the CS roller 10 are once stopped. Then, when a predetermined time elapses, the drive motor is driven again, and the ADF roller 7a, the feeding roller 8a, the discharge roller 11a, and the CS roller 10 are rotated. After the rotation of the rollers 7a, 8a, 11a, 10 and the like, until the leading edge of the document 4 is conveyed to the reading position 9a of the contact image sensor 9, the contact image sensor 9 causes the C
The peripheral surface (white as the reference color) of the S roller 10 is read.

Next, when the leading edge of the original 4 is conveyed to the reading position 9a of the contact image sensor 9, the image information of the original 4 is read. At this time, the original 4 is pressed by the CS roller 10 from directly above the reading position 9a of the contact image sensor 9, that is, the reading line of the contact image sensor 9 and the bus line of the CS roller 10 coincide with each other. Does not rise above the reading position 9a, and the image information can be read accurately.

When the reading of the original 4 is completed in this manner, the original 4 is sent to the discharge section 11 by the CS roller 10 which also serves as a conveyance of the original, and the discharge rollers 11a,
The sheet 11b is ejected from the document ejection port 6 to the outside of the apparatus.
This completes the work of reading the image information for one sheet of the original 4. After this, if there is a document 4 in the document guide 5,
The same operation as described above is repeated again.

[Other Embodiments] FIG. 3 shows another embodiment of the present invention. In the above-described embodiment, the U-shaped groove 9b provided at both ends of the contact image sensor 9 and the convex portion 13a of the collar 13 provided on both end shafts of the CS roller 10 are fitted to each other, thereby the contact image sensor. Although the reading line 9 and the generatrix of the CS roller 10 are made to coincide with each other, in the present embodiment, a supporting member for rotatably supporting the CS roller 10 is formed of a mold or sheet metal as shown in FIG. Also, the forks 14 having the U groove 14a are attached to both ends of the contact image sensor 9 with screws 14b or the like, and C
Cylindrical collar 15 provided on the shaft at both ends of the S roller 10
The same effect can be obtained even when the reading line of the contact image sensor 9 and the bus bar of the CS roller 10 are made to coincide with each other by mounting the fork 14 so as to be sandwiched in the U groove 14a. Since the basic structure of the entire apparatus is substantially the same, the same members are designated by the same reference numerals.

Further, in the above embodiment, the collar 13 having the convex portion 13a and the bearing for holding the CS roller 10 on the main body frame are separate members, but they may be integrated.
That is, a convex portion is provided on the contact type image sensor side of the bearing attached to the main body frame, and the convex portion is attached so that the U groove of the contact type image sensor is fitted to the bearing line. You may match the bus line of.

[0021]

As described above, the positional relationship between the reading means for reading the image information of the original document and the pressing means provided at the opposite position is determined by the supporting member for supporting the pressing means. Since it was configured to position,
The reading line of the contact image sensor which is the reading unit and the bus line of the CS roller which is the pressing unit can be easily matched with each other, and the document does not float on the reading line, and the image information of the document is accurately read. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of a reading unit showing a positional relationship between a contact image sensor and a CS roller.

FIG. 2 is a side sectional view showing a facsimile apparatus by cutting a part thereof.

FIG. 3 is a perspective view of a reading unit showing a positional relationship between a contact image sensor and a CS roller.

FIG. 4 is a side sectional view showing a conventional facsimile apparatus with a part thereof cut away.

FIG. 5 is a perspective view showing a conventional CS roller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Device main body 1a ... Top cover 2 ... Original reading section 3 ... Original insertion port 4 ... Original 5 ... Original guide 6 ... Original ejection port 7 ... ADF section 7a ... ADF roller 7b ... Pressing piece 8 ... Feed section 8a ... Feed Feed roller 8b ... Pressing roller 9 ... Contact type image sensor 9a ... Reading position 9b ... U groove 10 ... CS roller 11 ... Discharging section 11a ... Discharging roller 11b ... Pressing roller 12 ... Recording section 13 ... Color 13a ... Convex section 13b ... Hole 14 ... Fork 14a ... U groove 14b ... Screw 15 ... Roller serial number 2083006

Claims (1)

[Claims] 1. A reading unit for reading image information of a document, and a pressing unit for closely pressing the document against the reading unit, the pressing unit provided at a position facing the reading unit. An image reading apparatus characterized in that the positional relationship with the means is arranged by a supporting member for supporting the pressing means.