JP3418501B2 - Reader - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reader,
More specifically, the present invention relates to a reading device that reads a high-quality image by appropriately pressing a document on a reading sensor with a pressing member that also serves as a white reference.

[0002]

2. Description of the Related Art A conventional reader using a contact sensor is
Generally it is configured as shown in FIG. That is,
As shown in FIG. 4 , the conventional reader 1 has a contact sensor 2
R1 roller 3 and R2, which are a pair of conveying rollers, sandwiching
A roller 4 is provided, and opposed rollers 5 and 6 are in contact with the R1 roller 3 and the R2 roller 4, respectively. The opposing roller 5 and the opposing roller 6 are the upper guide plate 8 forming the transport path 7.
The leaf springs 9 and 10 are attached to the R1 roller 3 and the R2 roller 4.

The contact sensor 2 includes a light source 2a, a contact glass 2b, and a CCD (Charge Coupled Device) 2
c and the like, as shown in FIG. 5 , the bracket 11
Is attached to. The bracket 11 is the reader 1
It is attached to a frame or the like (not shown).

A white mylar 12 also serving as a white reference is in contact with the contact glass 2a of the contact sensor 2, and the white mylar 12 is attached to the upper guide plate 8.

A document 15 separated one by one by the separation roller 13 and the separation pad 14 is conveyed to the R1 roller 3, and the separation roller 13 and the separation pad 14 carry the document 15 set on a document table (not shown). Separated one by one, R
1 Send to roller 3. In this separation roller 13 part,
The S1 sensor 16 is provided, and when the S1 sensor 16 detects the document 15, the separation roller 13 is rotationally driven to separate the document 15 together with the separation pad 14 one by one and send it to the R1 roller 3.

An S2 sensor 17 for detecting the conveyed original is arranged in the R1 roller 3 portion. When the S2 sensor 17 detects the leading edge of the original 15, the R1 roller 3 is detected.
After the document 15 is conveyed by the opposed rollers 5 by a predetermined amount, the document 15 is temporarily stopped. Then, in response to the reading start command, the R1 roller 3 rotates, and the original 15 is placed on the contact sensor 2 and the white mylar 12.
Transport between and. By the time the original 15 is conveyed to the contact sensor 2, the contact sensor 2 irradiates the white mylar 12 with light from the light source 2a through the contact glass 2b, reads the white mylar 12, and reads the white reference data. To determine the white level.

When the original 15 is conveyed to the contact sensor 2, the contact sensor 2 irradiates the original surface of the original 15 conveyed through the contact glass 2b with the light from the light source 2a, and the reflected light thereof. 1 into the CCD 2c
Read image 5

The original 15 whose image has been read by the contact sensor 2 is conveyed between the R2 roller 4 and the opposed roller 6,
After that, the document 15 is printed with the R1 roller 3, the facing roller 5 and the R
The sheet is conveyed by the two rollers 4 and the opposed rollers 6 and discharged to a document tray (not shown). At this time, the R2 roller 4
The document conveying speed is set to be higher than the R1 roller 3 by a predetermined amount, and the document 15 is stretched by the R1 roller 3 and the opposing roller 5 and the R2 roller 4 and the opposing roller 6 so as not to generate wrinkles. Be transported.

While being conveyed on the contact sensor 2, the original 15 is pressed against the contact glass 2b of the contact sensor 2 by the white mylar 12, and the image is read in the state of being in contact with the contact glass 2b. .

The above-described document feeding and reading process is sequentially performed in the same manner, and when the S1 sensor 16 no longer detects the document 15, the process ends.

A white mylar 12 is attached to such a contact sensor 2.
Is contacted and the white level is determined by reading the white mylar 12 before the original 15 is conveyed to the contact sensor 2.
In the reading device 1 that reads the image of the document 15 by pressing the conveyed document 15 against the contact glass 2b of the contact sensor 2 with the white mylar 12, the white mylar 12
Properly adheres to the contact glass 2b of the contact sensor 2 and holds the original 15 being conveyed.
It is important to properly press in order to read the image of the document 15 with high quality.

However, in the above-mentioned conventional reading device 1, the white mylar 12 makes the opposite roller 5 and the opposite roller 6 R.
Since it is attached to the upper guide plate 8 to which the leaf springs 9 and 10 for pressing against the 1 roller 3 and the R2 roller 4 are attached, the upper guide plate 8 is deformed by the reaction of the leaf springs 9 and 10, for example, 4 is deformed in a state where the end of the original 15 to which the leaf springs 9 and 10 of the upper guide plate 8 of FIG. 4 in the conveyance direction are displaced from the central portion is deformed, and is attached to the deformed upper guide plate 8. The contact state between the white mylar 12 and the contact glass 2b of the contact sensor 2 is different between the central portion and the end portion in the width direction of the document 15. Therefore, the light from the light source 2a is projected on the original 15 and white mylar 12 of the contact sensor 2, as indicated by one-dot chain lines in FIG. 6, not properly incident on CCD2c, also the contact glass 2b and white Mylar 12 Wrinkles on the original 15 conveyed between
However, there is a problem that the reading accuracy of the original document and the reading accuracy of the original document 15 are deteriorated, and the reading quality is deteriorated.

Therefore, conventionally, the document conveyed to the reading means for reading the image information of the document conveyed by the document conveying means on the reading line is pressed by the pressing means via the flexible sheet to the reading line, and the image is transferred. A reading device has been proposed in which the flexible sheet has a step that is pressed by the pressing means so that the document does not come into contact with the reading line and contacts the document before and after the reading line ( JP-A-6-2
25074).

According to this conventional reading apparatus, it is possible to prevent the original from floating or touching on the reading line.

[0015]

However, in such a conventional reader, the document is pressed by the pressing means via the flexible sheet. how attached are not clear, as in the prior art shown in FIG. 4, R1 rollers and R
If it is attached to the same member as the elastic member for pressing the opposed rollers against the two rollers, for example, the upper guide plate, the same problem as in the prior art shown in FIGS. 4 to 6 occurs.

Therefore, according to the present invention, the pressing member that also functions as a white reference for pressing the document against the reading sensor is attached to a mounting member different from the mounting member to which the biasing member that presses the opposing roller against the conveying roller is mounted. Even if the mounting member to which the biasing member is mounted is deformed by the biasing member that presses the opposing roller against the transport roller, the pressing member is uniformly applied to the reading sensor without being affected by the deformation of the mounting member. An object of the present invention is to provide a reading device that can closely read a white reference and can uniformly press an original against a reading sensor by a pressing member to improve reading quality .

[0017]

According to a first aspect of the present invention, there is provided a reading device for reading an image of a document being conveyed, and the document conveyed to the reading sensor is provided on a reading surface of the reading sensor. A pressing member that also serves as a white reference to be pressed, a pair of conveying rollers that sandwich the reading sensor, and a pair of opposed rollers that come into contact with the pair of conveying rollers and convey the document together with the conveying rollers. And a biasing member that is mounted on a predetermined mounting member and presses the pair of opposed rollers against the pair of transport rollers, respectively, wherein the pressing member has the biasing member mounted thereon. It is mounted on a predetermined mounting member different from the mounting member, and is arranged in front of the pair of conveying rollers in the conveying direction.
The transport speed of the transport roller downstream of the reading sensor is upstream
Is set faster than the transport speed of the transport rollers of
The reading surface of the sensor is the same as that of the pair of transport rollers.
A certain amount of protrusion in the direction of the original conveyed by the opposite roller
According to the arrangement, characterized in that it is disposed such that out with the pressing member which also serves as a white reference pressed against the sensor reads the document, is mounted a biasing member that presses the roller 56 to the conveyance roller Since it is mounted on a mounting member different from the mounting member, even if the mounting member on which the biasing member is mounted is deformed by the biasing member that presses the opposing roller against the transport roller, the influence of the deformation of the mounting member is not affected. The pressing member can be brought into close contact with the reading sensor evenly without being received, the white reference can be read appropriately, and the original can be pressed uniformly against the reading sensor by the pressing member to improve the reading quality. .

Further , the carrying direction of the pair of carrying rollers
To increase the transport speed of the transport roller on the downstream side of the reading sensor.
The reading speed of the reading sensor is set higher than the feeding speed of the feeding roller on the flow side, and the reading surface of the reading sensor is set in the direction of the original conveyed by the pair of feeding rollers and the facing roller. Since it is arranged so that it protrudes by a predetermined amount, the pulling force applied to the document while being conveyed while being pulled by the feed rollers and the opposed rollers provided on the upstream side and the downstream side of the contact sensor in the document feeding direction. Thus, it is possible to press against the reading surface of the contact sensor, improve the contact between the reading surface of the contact sensor and the document, and improve the reading quality of the document by the contact sensor.

In the reading device of the second aspect of the present invention, since the pressing member also serving as a white reference for pressing the original document against the reading sensor is attached to the attachment member to which the reading sensor is attached, the pressing member is always provided in the reading sensor. Evenly and with a constant pressing force, the white reference can be read more appropriately, and the original is pressed against the reading sensor with a pressing member uniformly and with a constant pressing force. The reading quality can be further improved .

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below are preferred embodiments of the present invention, and therefore have various technically preferable limitations. However, the scope of the present invention refers to the present invention particularly in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

[0021] Figures 1 and 2, 1 real reading apparatus of the present invention
2 is a diagram showing an embodiment, and in FIG. 1, a reading device 40
R is a pair of conveyance rollers with the contact sensor 21 interposed therebetween.
1 roller 22 and R2 roller 23 are arranged,
Opposing rollers 24 and 25 are in contact with the roller 22 and the R2 roller 23, respectively. The opposing roller 24 and the opposing roller 25 are pressed against the R1 roller 22 and the R2 roller 23 by leaf springs (biasing members) 26 and 27, respectively, and the leaf spring 26 and the leaf spring 27 form a document conveyance path 28, respectively. It is attached to the upper guide plate (mounting member) 29.

As shown in FIG. 3 , the contact sensor 21 includes a light source 21a, a contact glass 21b, a CCD 21c, etc., and is attached to a bracket (mounting member) 30 attached to a frame (not shown) of the reader 40.
There is.

[0023] The contact glass 21b provided on the upper portion of the contact sensor 21, a white Mylar (pressing member) are four 1 is disposed in a state closely contact, white color mylar 41, the bracket (mounting member) 42 by that it is attached to the bracket 30 of the contact sensor 21. White color Myra 4 1,
As is the surface of the contact sensor 21 side is subjected to white, that provides a white reference value of the reading of the reading device 20. Bracket 30 of dense adhesion sensor 21 is mounted to a frame or the like (not shown) of the read winding device 40.

[0024] That is, the bracket 42 which holds fixed the white mylar 41, as shown in FIG. 2, which is fixedly attached to both side surfaces of the bracket 30 of the contact sensor 21. In addition, the bracket 42 of the white mylar 41 and the bracket 30 of the contact sensor 21 are not limited to those configured by different members, and may be integrally formed .

FIG. 3 shows an enlarged view around the contact sensor 21 .
You The contact sensor 21 includes an R1 roller 22 and an opposing roller 24.
A little above the line connecting the abutting position of the R2 roller 23 and the abutting position of the R2 roller 23 and the opposing roller 25, that is, R1
The contact glass 21b, which is a reading surface, is arranged in a state of protruding by a predetermined amount in the direction of the original 34 conveyed by the roller 22 and the opposed roller 24 and the R2 roller 23 and the opposed roller 25. Therefore, the R1 roller 22 and the opposing roller 2
4 and the R2 roller 23 and the opposite roller 25, the original 34 is conveyed by being sandwiched between the R2 roller 23 and the R1 roller 22.
Since the document transport speed is set to a little faster than
It is conveyed by being pulled by the two rollers 23 and the opposing roller 25 and being in close contact with the contact glass 21b of the contact sensor 21 .

The original 34 is conveyed from the separating roller 33 to the R1 roller 22, and the separating pad 33 is urged toward the separating roller 33 by an urging member (not shown). There is. An S1 sensor 36 is arranged near the separation roller 33, and an S2 sensor 37 is arranged near the R1 roller 22. Optical sensors are used as the S1 sensor 36 and the S2 sensor 37, for example.

A control unit (not shown) of the reading device 20, based on the detection results of the S1 sensor 36 and the S2 sensor 37, the contact sensor 21, the separation roller 33, and the R1 roller 22.
Also, the drive of the R2 roller 23 is controlled to carry the document 34 and read the image of the document 34 .

Next, the operation will be described. The reader 40 is
When the S1 sensor 36 detects that the original 34 is set on the original placing table (not shown) and a reading instruction is given on the operation display (not shown), the controller (not shown) causes the separation roller 33 to be operated.
Is driven to separate the original 34 together with the separation pad 35, and the original 34 is conveyed to the R1 roller 22.

The original 34 is the R1 roller 22 and the facing roller 24.
When the S2 sensor 37 detects the leading edge of the original 34 after passing through the space, the control unit rotationally drives the R1 roller 22 by a fixed amount, conveys the original 34 by a fixed amount, and then temporarily stops the reading start command. If there is, the R1 roller 22 is driven to convey the original 34 to the contact sensor 21.

The contact sensor 21 is document 34 is stopped temporarily, reads the white reference face of the white mylar 4 1 until conveyed to the contact sensor 21, the control unit, the reading of the white reference plane data Determines the white reference level.

[0031] When the document 34 is conveyed between the contact glass 21b and white Myra 4 1 of contact sensor 21, the document 34 is conveyed in a state of being pressed against the contact glass 21b by white mylar 41, the conveyor The original 34 is irradiated with light from the light source 21a of the contact sensor 21 through the contact glass 21b, the reflected light from the original 34 is received by the CCD 21c, and the image of the original 34 is read by the contact sensor 21.

Thereafter, the leading edge of the original 34 is placed on the R2 roller 23.
When the R2 roller 23 is reached, the R2 roller 23 is set to have a predetermined amount of document transport speed faster than the R1 roller 22.
The original 34 is conveyed while being pulled between the R1 roller 22 and the opposed roller 24 and the R2 roller 23 and the opposed roller 25, and the image of the conveyed original 34 is read by the contact sensor 21.

Thereafter, the rear end of the original 34 is placed on the S2 sensor 37.
Is detected, the image of the original is read by the contact sensor 21 while the original 34 is conveyed by a predetermined amount, and when the reading of the reading range of the original 34 is completed, the reading operation of the original 34 by the contact sensor 21 is stopped. Then, the R2 roller 23 and the opposing roller 25 eject the document 34 to a document tray (not shown).

[0034] In the above operation, a white mylar 4 1 Bed <br/> through the racket 4 2, leaf springs 26, 27 for pressing the roller 56 and 25 to the R1 roller 22, R2 rollers 23
The upper guide plate 29 is attached to a mounting member different from the upper guide plate 29 to which the upper guide plate 29 of FIG.
Even if it is deformed to some extent by the reaction of 6, 27, white mylar 4
The 1, whatever effect without giving a white mylar 4 1 is closely in contact glass 21b appropriately contact sensor 21.
Therefore, by reading the white reference white mylar 4 1 by contact sensor 21, it is possible to obtain an appropriate white reference level, a document 34, without causing wrinkles or the like, appropriately brought into close contact to the contact glass 21b It can be conveyed, and the reading accuracy and reading quality of the reading device 40 can be improved.

Further, white mylar 4 1, because it has a predetermined elasticity, even contact sensor 21 is slightly shifted,
It is possible to properly contact the contact glass 21b and maintain good reading accuracy and reading quality .

The bracket 42 holding and fixing the white mylar 41 is the bracket 3 holding the contact sensor 21.
Since it is fixed at 0, it is possible to prevent the displacement of the contact sensor 21 and the white mylar 41 from occurring, and
Contact glass 2 of contact sensor 21 with white mylar 41
It can be brought into close contact with 1b appropriately and with a constant pressing force, and the reading accuracy and reading quality of the reading device 40 can be further improved .

The contact sensor 21 is arranged with the contact glass 21b, which is the reading surface, protruding in a predetermined amount in the direction of the original 34 conveyed by the R1 roller 22 and the opposed roller 24 and the R2 roller 23 and the opposed roller 25. Because
When the original 34 is conveyed while being sandwiched between the R1 roller 22 and the opposed roller 24 and between the R2 roller 23 and the opposed roller 25,
The original document 34 is conveyed while being pulled by the R2 roller 23 and the counter roller 25, which are set to have a document conveying speed slightly higher than that of the R1 roller 22, and the document 34 is brought into close contact with the contact glass 21b of the contact sensor 21. As a result, the original 34 can be further conveyed while being brought into close contact with the contact glass 21b of the contact sensor 21, and can be read, and the reading quality of the image of the original 34 can be further improved.

Although the invention made by the present inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above, and various modifications can be made without departing from the scope of the invention. It goes without saying that it is possible.

[0039]

According to the reading apparatus of the present invention, the pressing member that also functions as a white reference for pressing the document against the reading sensor is attached differently from the mounting member to which the biasing member that presses the opposing roller against the conveying roller is attached. Since it is attached to the member, even if the attaching member to which the urging member is attached is deformed by the urging member that presses the opposing roller against the transport roller, it is not affected by the deformation of the attaching member.
The pressing member can be brought into close contact with the reading sensor evenly,
The white reference can be properly read, and the original can be uniformly pressed against the reading sensor by the pressing member to improve the reading quality .

[0040] are a pair arranged across the reading sensor transportable
The feed roller is located on the downstream side of the reading sensor in the feed direction.
The transport speed of the roller is faster than the transport speed of the upstream transport roller.
Since the reading surface of the reading sensor is arranged so as to project by a predetermined amount in the direction of the original conveyed by the conveying rollers and the opposed rollers, the reading surface of the contact sensor is arranged upstream and downstream of the original conveying direction. The original that is conveyed while being pulled by the conveyance roller and the opposing roller can be pressed against the reading surface of the contact sensor by the pulling force applied to the original, and the adhesion between the reading surface of the contact sensor and the original can be improved. Thus, the reading quality of the original document by the contact sensor can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an embodiment of a reading device of the present invention.

FIG. 2 is a perspective view of a contact sensor portion of FIG.

FIG. 3 is an enlarged side view around the contact sensor 21 shown in FIG .

FIG. 4 is a side view of a main part of an example of a conventional reading device.

Figure 5 is an enlarged side view of the contact sensor portion in FIG.

FIG. 6 is a side view of a main part showing a state in which the contact sensor of FIG. 4 and the white mylar are misaligned.

[Explanation of symbols]

21 Contact sensor 21a light source 21b contact glass 21c CCD 22 R1 roller 23 R2 roller 24, 25 facing rollers 26, 27 leaf spring 28 Document transport path 29 Upper guide plate 30 brackets 33 Separation roller 34 manuscript 35 Separation Pad 36 S1 sensor 37 S2 sensor 40 reader 41 White Myra 42 bracket

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04N 1/19 H04N 1/04 103E (56) Reference JP-A-7-301962 (JP, A) JP-A-2-129673 ( JP, A) JP-A-7-101591 (JP, A) JP-A-4-326853 (JP, A) JP-A-1-97940 (JP, A) JP-A-4-2263 (JP, A) JP-A-9-233262 (JP, A) JP-A-6-225074 (JP, A) JP-A-6-60218 (JP, A) JP-A-7-162615 (JP, A) JP-A-5-103165 (JP , A) JP-A-3-19569 (JP, A) JP-A-6-6517 (JP, A) JP-A-1-293752 (JP, A) JP-A-6-14160 (JP, A) JP-A 63-138869 (JP, A) Japanese Unexamined Patent Publication No. 5-260260 (JP, A) Actually opened 62-125067 (JP, U) Actually opened 2-12 0966 (JP, U) Actually open 62-127166 (JP, U) Actually open 5-68171 (JP, U) Actually open 1-135864 (JP, U) Actually open 4-119166 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03G 15/00 107 B65H 5/36 B65H 7/14 G03B 27/50 H04N 1/00 108 H04N 1/19

Claims (2)

(57) [Claims] 1. A reading sensor for reading an image of a conveyed document, a pressing member also serving as a white reference for pressing the document conveyed to the reading sensor against a reading surface of the reading sensor, and the reading sensor sandwiched therebetween. And a pair of opposed rollers that contact the pair of conveyor rollers to convey the document together with the pair of conveyor rollers, and a pair of opposed rollers attached to a predetermined mounting member. And a biasing member that presses against the pair of conveyance rollers, wherein the pressing member is mounted on a predetermined mounting member different from the mounting member to which the biasing member is mounted ,
Downstream of the reading sensor in the transport direction of a pair of transport rollers
Transport speed of the upstream transport roller is upstream
The reading sensor is set faster than the speed
Is carried by the pair of conveying rollers and the pair of opposing rollers.
It is placed with a certain amount of protrusion in the direction of the document being fed.
A reading device characterized by being provided. Wherein said pressing member is attached to the member Mounting that attached the said reading sensor, according to claim 1
The reading device according to.