JP3208250B2 - 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 reading apparatus for reading information recorded on a medium by a reading section, and positioning a medium supporting member disposed at a predetermined gap from the reading section and in contact with a medium to be conveyed. About.

[0002]

2. Description of the Related Art A facsimile apparatus, an optical character reading apparatus and the like are provided with a reading apparatus for reading information recorded on a medium. Some reading apparatuses include, for example, a reading unit that irradiates a medium with light to optically read information recorded on the medium, and a medium supporting member that faces the reading unit. The medium support member is provided with a predetermined gap from the reading unit so as not to generate a load due to contact with the reading unit. Then, when the medium is conveyed by the conveying means into the predetermined gap, the focus of the reading position on the medium and the reading position of the reading unit are adjusted.

[0003]

In a conventional reading apparatus,
A predetermined gap is provided between the reading unit and the medium supporting member to prevent a load from being caused by contact between the reading unit and the medium supporting member. In addition to increasing the accuracy, it is necessary to perform a position adjustment operation at the time of mounting components, and thus there is a problem that the number of assembling steps is increased.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to a medium support member provided with a predetermined gap from a reading section , comprising a rotatable roller, and a portion outside the medium passage area of the reading section. The contact part that contacts the
Of the roller excluding the abutting part
The surface has a predetermined gap, and the focusing lens provided in the reading unit
Rollers are placed at opposing positions so that a predetermined gap is formed.
It is arranged.

[0005]

When assembling, when the contact portion of the medium supporting member is brought into contact with the reading portion and the medium supporting member is attached to the reading device, a predetermined gap is formed between the medium supporting member and the reading portion.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. Elements common to the drawings are assigned the same reference numerals. FIG. 1 is a schematic perspective view showing a reading device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a contact state of a contact portion of the embodiment. FIG. 3 is an explanatory view showing a sheet conveyance state of the embodiment.

A reading device 1 provided in a facsimile machine
Has a contact image sensor 2 as a reading unit, a rubber reading roller 3 as a medium support member, and a frame 6 for rotatably supporting the reading roller 3 as shown in FIG. The contact image sensor 2 is fixed to a frame 6 via a bracket 5 with screws 7. As shown in FIG. 2, the contact image sensor 2 has a dustproof glass plate 2 a fitted at a position facing the reading roller 3, and an LED 2 b for irradiating light to the paper 9 and condensing light reflected from the paper 9. Erecting equal-magnification imaging lens 2c and erecting equal-magnification imaging lens 2
It has a photoelectric conversion element 2d that photoelectrically converts the light passing through c.

The reading roller 3 has a stepped shape,
Contact portions 3 a are formed at both ends of the reading roller 3. The contact portion 3a contacts the glass plate 2a outside the paper passage area of the contact image sensor 2. The outer peripheral surfaces of both contact portions 3a are coated with a fluororesin such as Teflon, for example. The shaft 3b of the reading roller 3 is made of metal, and bearings 4a and 4b are fixed to both ends, and these bearings 4a and 4b are formed by cutouts 6 formed in a frame 6.
a. The bearings 4a and 4b are pressed against the bottom (in the direction of arrow D) of the notch 6a by a spring 12 provided above. Each spring 12 is attached to the reading device 1. A gear 8 is attached to an end of the shaft 3b on the bearing 4b side. The gear 8 is connected to a gear of a motor (not shown).

A predetermined gap B shown in FIG. 2 is formed in a paper passage area between the contact image sensor 2 and the reading roller 3, and the paper 9 is conveyed in the predetermined gap B. If the sheet 9 is within the predetermined gap B, the reading position on the sheet and the reading position of the contact image sensor 2 can be focused. As shown in FIG. 3, the paper 9 is nipped and transported by a pair of transport rollers 10 arranged in the transport path of the reading device 1. One of the transport rollers 10 is a feed roller 10a, and the other is a pinch roller 10b. Each feed roller 10a
Is connected to a motor, and each pinch roller 10b is provided with a spring 11 to
a. Each spring 11 is attached to the reading device 1.

Next, the mounting operation of the reading roller 3 of the embodiment will be described with reference to FIGS. After the contact image sensor 2 is fixed to the frame 6 of the reading device 1 via the bracket 5, both contact portions 3a of the reading roller 3 are brought into contact with the glass plate 2a of the contact image sensor 2, and
The bearings 4a and 4b are fitted into the notches 6a of the frame 6, respectively. Then, the bearings 4a, 4
b is pressed against the bottom of the notch 6a. As described above, the outer peripheral surface of the reading roller 3 excluding the contact portion 3a is attached with a predetermined gap B from the glass plate 2a of the contact image sensor 2.

Next, the operation of transporting the sheet 9 will be described. The motor is driven to rotate the feed roller 10a and the reading roller 3 in the direction of arrow C. The rotation of the feed roller 10a rotates the pinch roller 10b, whereby the paper 9 is transported to the predetermined gap B. At this time, the paper 9 is
Contacting the outer peripheral surface of the reading roller 3 except for a. Since the reading roller 3 is rotating, the leading end of the sheet 10 does not hit the reading roller 3 and is not caught. At this time, the contact portion 3a is rotated by being pressed against the glass surface 2a by the pressing force of the spring 12, but the coating of the contact portion 3a reduces the coefficient of friction.
It does not become a load.

According to the above embodiment, when the predetermined gap B is set by providing the contact portion 3a in contact with the contact image sensor 2 on the reading roller 3, it is not necessary to consider the dimensional accuracy of each component. Normally, an accuracy of ± 0.05 mm can be obtained only by finishing the step of the contact portion 3a. Therefore, there is no need for the adjustment work using the bracket 5.

Next, a modification of the above embodiment will be described with reference to FIGS. FIG. 4 is a schematic configuration diagram illustrating a reading roller according to a modified example. The reading roller 30 shown in FIG. 4 is attached to the reading device 1 instead of the reading roller 3 provided in the reading device 1 of FIG. A rubber roller portion 30c is provided on the outer peripheral surface of the metal shaft 30b of the reading roller 30.
And a contact portion 30a separately formed of a resin having a small coefficient of friction
Is attached. The contact portion 30a contacts the glass surface 2a of the contact image sensor 2. With the contact portion 30a in contact with the glass surface 2a, the roller portion 30c faces the glass surface 2a with a predetermined gap B. Other structures are the same as those in the above embodiment.

Next, the mounting operation of the reading roller according to the modified example of the above structure will be described.

The roller portion 30c is attached to the shaft 30b, and the contact portions 30a are attached from both ends of the roller portion 30c. Thereafter, the contact image sensor 2 is fixed to the frame 6 of the reading device 1 via the bracket 5, and the contact portions 30
a is brought into contact with the glass plate 2a of the close contact image sensor 2, and the bearings 4a and 4b are fitted into the cutouts 6a of the frame 6, respectively. Then, the bearings 4a and 4b are pressed against the bottom of the notch 6a by the spring 12. As described above, the outer peripheral surface of the roller portion 30c is attached with the predetermined gap B from the glass plate 2a.

The transport operation is the same as in the above embodiment, and a description thereof will be omitted.

In the above modification, when the predetermined gap B is set by providing the contact portion 30a in contact with the contact image sensor 2 on the reading roller 30, it is not necessary to consider the dimensional accuracy of each component. It is only necessary to apply a finishing process to 30a. Therefore, there is no need for the adjustment work using the bracket 5 as in the above embodiment. In this modification, the contact portion 30a
Is a separate member, which is to be attached later, so that when the reading roller 30 is manufactured,
It can be replaced with a. Further, the contact portion 30a is used during use.
Is worn out, only the contact portion 30a needs to be replaced, and the entire reading roller 30 need not be replaced.

Although the above embodiment and the modified examples have been described as examples applied to a facsimile apparatus, the present invention can also be applied to a reading apparatus using a contact image sensor. In addition, the contact portion is coated, or the contact portion is formed of resin, so that the coefficient of friction with the contact image sensor is reduced. However, the coating is applied to the contact image sensor side, or a roller or a bearing is used. May be provided to reduce the coefficient of friction with the contact portion.

[0019]

As described in detail above, the present invention provides
On a medium support member arranged with a predetermined gap from the reading unit,
By forming the abutting portion that abuts on the portion outside the medium passage area of the reading unit, a predetermined gap is provided between the medium supporting member and the reading unit only by abutting the abutting portion of the medium supporting member with the reading unit. Can be formed. Therefore, there is no need to increase the dimensional accuracy of each part, and there is no need to perform position adjustment work at the time of assembling the parts, reducing the number of assembling steps.
An inexpensive device can be configured.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a reading apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a contact state of a contact portion according to the embodiment.

FIG. 3 is an explanatory diagram illustrating a sheet conveyance state according to the embodiment.

FIG. 4 is a schematic configuration diagram illustrating a reading roller according to a modified example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reading device 2 Contact image sensor 3, 30 Reading roller 3a, 30a Contact part 9 Paper 12 Spring

Claims (4)

(57) [Claims] A medium support unit provided with a predetermined gap from a reading unit;
Material is provided, and the medium is brought into contact with the medium supporting member to
Conveys through gaps and reads information stored on media
In the reader,The medium supporting member is constituted by a rotatable roller,  Abutment part that contacts the outside of the medium passage area of the reading unitIs stepped
End portions of the roller formed into a shape, The surface of the roller except for the abutting portion is located from the reading portion.
It has a constant gap and is paired with the condenser lens provided in the reading unit.
At the opposite position so that the predetermined gap is formed.
A reading device, wherein a reading device is provided. 2. The reading device according to claim 1, wherein a spring for pressing the contact portion is provided at a portion outside the medium passage area of the reading portion . 3. A method in which the contact portion is coated with a resin.
The reading device according to claim 1 or 2. 4. The apparatus according to claim 1, wherein said contact portion is formed of resin.
A reading device according to claim 2.