JPH04104562A - Reader - Google Patents

Abstract

PURPOSE:To closely bring a document into contact with efficient pressing by providing the fulcrum of rotation of a holding member on the axis of a roll placed in the vicinity of a contact image sensor. CONSTITUTION:A contact image sensor 9 placed between a supply part and an ejecting part 11 in a reader of a facsimile equipment or the like which uses a contact sensor having a shallow object depth is attached to a holding member 13 having a rotation fulcrum 13a. The rotation fulcrum 13a is placed on the axis of a supply roll 8a in the vicinity of the contact image sensor 9, and a torsion spring 14 is attached to the roll shaft, and thereby, a counterclockwise rotating force F acts on the holding member 13. Thus, the contact sensor is efficiently pressed, and the more miniaturized reader is obtained.

Description

[Detailed description of the invention] <Industrial application field> Rumor has it that the invention uses a close-contact sensor with a shallow depth of field. The present invention relates to a reading device such as a facsimile machine.

<Prior art> In general, reading devices such as facsimile machines are composed of a lens and a CCD because they are unitized, can be made smaller and lighter, and are easy to maintain and handle. Contact type sensors are often used instead of equipped with optical systems.

However, a short focus imaging lens commonly used as a contact type sensor, such as a SELFOC lens (trade name), has a depth of field as shallow as ±0.3, making it difficult to read outside this range. Therefore, in a reading device that uses a contact type sensor such as a SELFOC lens, it is necessary to bring the surface of the document into close contact with the contact type sensor. For example, a device shown in FIG. 3 is known.

FIG. 3 shows a reading device in a facsimile machine, in which a document reading section A is provided with a document insertion slot 51.
A document 52 is inserted through the document insertion slot 51 and separated into sheets one by one by a pair of separation rollers 53 and 54, and the separated document 52 is transferred to a pair of feed rollers 55 and 56 by a contact sensor roller 57 (hereinafter referred to as FCS roller). The paper is sent to a contact type sensor 58 that is in close contact with the paper (hereinafter referred to as "paper"), and after reading the image information, it is discharged from the apparatus by a pair of paper discharge rollers 59 and 60.

A contact sensor 58 for reading image information of the document 52 is in close contact with a CS roller 57 made of an elastic material such as rubber. As particularly shown in FIG. 4, as the contact means, the contact type sensor 58 is attached to a holding member 61, and is arranged to be rotatable around a rotational fulcrum 61a of the holding member 61. A torsion spring 62 is attached to. Therefore, a rotational force F' is exerted by the torsion spring 62 in the counterclockwise direction in FIG. 4 about the rotational fulcrum 61a. At this time, the rotational fulcrum 61a is the contact type sensor 5
As a result, the force with which the reading surface 58a of the contact type sensor 58 is pressed perpendicularly to the CS roller 57 is a component of the rotational force F'. A pressure Fa' is generated, and the contact type sensor 58 and the CS roller 57 are formed in close contact with each other due to the pressing forces F and I.

Incidentally, the component force F' of the X component of the rotational force F' is the contact type sensor 5.
8 does not act as a force to press against the CS roller 57, resulting in wasted force.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional technology, the holding member 6
The rotation fulcrum 61a of No. 1 is located far away from the reading position (
For example, the distance from the rotation axis center to the reading position in Fig. 4 is 1.
= 45 vm and the angle θ with respect to the document conveying surface = 30 degrees), there was a problem that the space of the reading section became quite large.

Further, the CS roller 57 is made of an elastic material such as a rubber material.
Due to the deformation of the CS roller 57 and the action of the component force F8' which is not directed in the axial direction of the CS roller 57, the variation angle β in the rotational direction of the holding member 61 appears as a deviation amount X as shown in FIG. As a result, the amount of floating of the original document y occurs, and the reading accuracy decreases. This becomes a particular problem when reading with high gradation.

For example, when using a complete contact image sensor (SELFOC lensless contact image sensor), when the amount of deviation It is difficult and problematic to perform 64-gradation reading.

Furthermore, in FIG. 4, the rotational direction of the rotational force F' is not directed toward the axial direction of the CS roller 57, but is deviated by an angle α', so that the force pressing the CS roller 57 is ll- %
Therefore, in order to obtain the predetermined pressing forces F and #, it is necessary to press the CS roller 57 with a larger rotational force F', and the reaction force of the torsion spring that generates the strong rotational force F' There is a problem in that the frame and the like forming the rotational fulcrum 61a of the holding member 61 are deformed, and as a result, the reading position may be shifted.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and aims to provide a more compact reading device that can efficiently press the contact type sensor. .

<Means for Solving the Problems> Typical means for solving the above problems and applied to the embodiments described below include a conveying means for conveying a document, and a reading means for reading image information of the document in close contact with each other. and a contact means for bringing the document into close contact with a predetermined reading position of the reading means, and a rotational fulcrum of a holding member to which the reading means is attached is provided on a roller shaft of the conveying means near the reading means. It is characterized by

<Function> The present invention improves the above-mentioned conventional technology by providing the rotation fulcrum of the holding member that holds the reading means on the roller shaft of the conveyance means disposed near the reading means, and making this the rotation center. The reading means can be pressed efficiently, and as a result, reading accuracy can be further improved and the reading device can be downsized.

<Embodiment> Next, an embodiment in which the above means is applied to a facsimile machine will be described.

[First embodiment]

FIG. 1 is a partially cutaway cross-sectional view of a reading section of a facsimile apparatus according to the present invention, and FIG. 2 is a principle explanatory diagram showing a close contact state of the reading section.

First, the overall configuration of the device will be explained with reference to Fig. 2.■
1 is a main body of the apparatus, and in order to make the whole apparatus compact, its upper cover 1a forms an inclined surface that becomes lower toward the front part (left end in FIG. 2) of the main body 1 of the apparatus. A document reading section 2 is equipped on the front side of the apparatus main body 1, and the document reading section 2 includes a document insertion slot 3 and a document guide 5 that can slide in the width direction of the document 4 within the document insertion slot 3. is provided.

Further, between the document conveyance path of the document reading section 2, that is, the document insertion port 3 and the document discharge port 6 provided in a part of the top cover 1a (above the inclined surface), there is a separation roller 7a and a separation roller 7a. a separating section 7 which separates the originals 4 sent with the original side facing down from the original guide 5 one by one, having a pressing piece 7b pressed by the separating section 7; A feeding section 8 consisting of a pair of feeding rollers 8a and 8b.
, a contact type image sensor 9 as a reading means for reading image information of the original document 4 conveyed from the feeding section 8, and a contact type image sensor 9 that faces the upper surface of the contact type image sensor 9 and places the original document 4 at a reading position 9a on the upper surface. CS roller 10 that conveys while closely contacting
and a discharge unit 11 consisting of a pair of discharge rollers lla and llb which discharge the read document 4 from the document discharge port 6.
etc. are equipped.

The close-contact image sensor 9 has a short focus imaging lens with a very shallow depth of field, and transfers the image information signal read from the original 4 to the recording section of another machine in the facsimile mode, or to the recording section of another machine in the copy mode. It is configured so that the information is transmitted to its own recording section (not shown) installed in the rear side (right side in FIG. 2) 12 of the device main body 1.

Next, the contact image sensor 9 of the document reading section 2 and the CS
The structure of the means for contacting the roller 10 will be explained in detail with particular reference to FIG.

The contact image sensor 9 located between the feeding section 7 and the discharging section 11 is attached to a holding member 13 having a rotation fulcrum 13a. The rotational fulcrum 13a is on the roller axis of the feeding roller 8a near the contact type image sensor 9, and by attaching a torsion spring 14 to the roller axis, the rotational fulcrum 13a is rotated counterclockwise in FIG. 1 with respect to the holding member 13. The structure is such that a rotational force F is applied to the rotational force F.

As described above, the rotational fulcrum 13a is located in the vicinity of the contact type image sensor 9 (for example, the distance jlz-20m from the center of the rotational axis to the reading position in FIG.
The deviation angle α in the rotational direction of the holding member 13 is minimized by providing the holding member 13 on the axis of the roller located at the rotational angle of 13° and minimizing the distance from the reading position 9a to the rotational fulcrum 13a.

As a result, the rotational force F of the holding member 13 is an X-component force, and is approximately equal to the pressing force F acting toward the center of the CS roller 10. As a result, the unnecessary force F of the X component becomes extremely small, so that it is possible to ensure close contact of the original 3 with the minimum necessary rotational force F.

The CS roller 10 is made of an elastic material such as rubber material in order to improve its adhesion to the reading position 9a.

[Other Examples]

In the first embodiment described above, the axis on the feed roller side is used as the rotational fulcrum of the holding member, but it is clear that the same effect can be obtained even if the rotational fulcrum is provided on the discharge roller side.

Furthermore, similar effects can be obtained by using a guide member, such as a plate-shaped member, in place of the CS roller.

<Effects of the Invention> As described above, the present invention provides the rotational fulcrum of the holding member on the axis of the roller near the contact type image sensor, thereby reducing the pressure of the contact type image sensor in the rotating direction of the holding member. Since the direction is, for example, substantially in the axial direction of the CS roller serving as the pressed member, it is possible to bring the document into close contact with efficient pressing.

In addition, a predetermined pressing force can be secured through efficient pressing, and as a result, there is no need for a spring or the like that generates a stronger pressing force, which reduces the reaction force at the rotational fulcrum of the holding member. As a result, there is no distortion at the rotation fulcrum position,
As a result, stable reading without deviation of the reading position is possible.

Furthermore, since the axis of the roller near the contact image sensor is used as the rotational fulcrum of the holding member, there is no need to provide a special rotational fulcrum member, creating the most compact and inexpensive reading unit. I can do it.

[Brief explanation of drawings]

FIG. 1 is a principle explanatory diagram showing the close contact state of the reading section in the present invention, FIG. 2 is a cross-sectional view showing the configuration of the reading section by partially cutting away the facsimile apparatus according to the present invention, and FIG. 3 is a cross-sectional view showing the configuration of a conventional reading unit in a facsimile machine, Fig. 4 is a principle explanatory diagram showing the close contact state of the conventional reading unit, and Fig. 5 is the amount of misalignment of the reading position and the amount of floating of the original. FIG. F is rotational force, FX, F is component force, ■ is the main body of the device, 2 is the document reading section, 3 is the document insertion slot, 4 is the document, 6 is the document ejection port, 8 is the feeding section, 8a, 8b are feeding roller; 9 is a contact type image sensor; 9a is a reading position; 10 is C3t)-ra;
Reference numeral 11 designates a discharge section, lla and llb discharge rollers, 13 a holding member, 13a a rotation fulcrum, and 14 a spring spring.

Claims (1)

[Scope of Claims] The document includes: a conveyance means for conveying a document; a reading means for reading image information of the document in close contact; and a close contact means for bringing the document into close contact with a predetermined reading position of the reading means; A reading device characterized in that a rotation fulcrum of a holding member to which a reading means is attached is provided on a roller shaft of the conveying means near the reading means.