JPS61148953A - Picture reading mechanism - Google Patents

Abstract

PURPOSE:To miniaturize an equipment by carrying an original in a U-turn way in the equipment. CONSTITUTION:A supply guide member 8 depressed to the lower part of a roller 6 by a spring 7 under the read platen roller 6 is supported turnably by a shaft. Further, a discharge guide member 11 depressed to the upper part of the roller by a spring at the upper part of the roller 6 is fitted to a discharge stay 13 supported turnably by the shaft 12. Then the original 3 loaded from an original inserting slit 1 is carried to the member 8 via an original presence detection sensor 2 and a pickup roller 5 or the like, carried with a constant speed on the circumferential face of the roller 6 by the member 8 and the roller 6, the picture information is read by a small-sized sensor 16 just after the original passes through a paper guide 18, guided by the member 11, carried in a U-turn way on the circumferential face of the roller 16 and discharged from an original discharge outlet 15. Since the original is carried in a U-turn way in this way, not by straightforward carrying, the entire equipment is miniaturized.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is an image reading mechanism that reads image information while conveying a document in a U-turn in an image recording device such as a facsimile, printer, or electrophotographic copying machine. It is related to.

<Prior Art> An image reading mechanism in a conventional facsimile machine is constructed as shown in FIG. That is, when a document 3 is placed on the document table 27 on the left side of the drawing, the document presence/absence sensor 2 is pushed down by the document 3, and the apparatus detects that the document 3 has been set. When a start button (not shown) of the apparatus is pressed in this state, the pickup roller 5 descends and rotates to send out the placed document 3 sequentially from the top to the right side of the drawing. The leading edge of the fed document 3 is detected by a document detection sensor 23, conveyed at a constant speed by a reading platen roller 6, image information is read by a small sensor 16, and is discharged onto a paper discharge table 28 on the right side of the drawing. has been done.

<Problems to be Solved by the Invention> Today, there is a desire for miniaturization of facsimile machines, but with the configuration in which the document 3 is conveyed in a straight line as described above, there is a problem that the machine becomes large.

The present invention is a technology developed to solve the above-mentioned conventional problems, and its purpose is to provide an image reading mechanism that has a simple structure and reads image information while transporting a document in a U-turn inside the device. That is.

Means for Solving the Problems> One means for solving the above problems will be explained using a facsimile machine as an example.

FIG. 1 is a cross-sectional explanatory view of a facsimile machine incorporating a mechanism according to an embodiment of the present invention, and the entire apparatus will be schematically explained with the left side of the drawing as the front and the right side as the rear. A document insertion slot 1 is provided at the front end of the device, and a document presence/absence sensor 2 is located near the insertion port 1, and the lower document guide is lowered by a signal from the sensor 2, presses against the document 3, and rotates counterclockwise. A big unroller 5 is provided which feeds out the document 3 rearward in cooperation with the roller 4.

Further, behind the big amplifier roller 5, there is provided a reading platen roller 6, which constitutes a rotating body, for conveying the delivered original 3 at a constant speed. As shown in FIG. 2, a supply guide member 8 which is pressed against the lower part of the reading platen roller 6 by a spring 7 is rotatably attached to the lower part of the reading platen roller 6 by a shaft 9. Also above the reading platen roller 6, a discharge guide member 11 which is pressed against the upper part of the reading platen roller 6 by a spring 10 is attached to a discharge stay 13 rotatably attached to the shaft 12.

Further, the exterior cover 14 is provided with a document ejection port 15 at a predetermined position.

The friction coefficients between the original 3, the lower original guide 4, and the pickup roller 5 are as follows: friction coefficient between the pink up roller 5 and original 3>friction coefficient between lower original guide 4 and original 3>original 3 They have a relationship of friction coefficient between them.

Furthermore, the coefficient of friction between the original 3, the reading platen roller 6, the supply guide member 8, and the ejection guide member 11 is greater than the coefficient of friction between the reading platen roller 6 and the original 3; The coefficient of friction between the guide members 11 has the following relationship.

Furthermore, a small sensor (a so-called contact type sensor, a same-size sensor, etc.) I6 is provided diagonally rearward and upper part of the reading platen roller 6 to read the image information of the document 3 that is conveyed in a U-turn by the reading platen roller 6. The small sensor 16 has a paper guide 18 supported by the frame 17 at one end, and is urged by a spring 19 from the rear of the frame 17 so that the paper guide 1B comes into pressure contact with the reading platen roller 6. . In addition, the small sensor 16
The information read by the facsimile machine is transmitted to the recording unit of another facsimile machine in the case of a facsimile operation, and to its own recording unit in the case of a copy operation.

The small sensor 16, as shown in FIG. The photoelectric conversion element 22 is configured to convert the signal into an electric signal, and is configured to extend across the entire width direction of the reading platen roller 6.Thereby, the document 3 can be read in the width direction at once, and its optical path length can be increased to about 10. Fl ~ 30 dragons are enough, and even more Gigai VIQAN!jit'2/7'lII+1i-
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Further, the leading edge and trailing edge of the original document 3 being conveyed at a constant speed are detected approximately in the middle between the contact point between the paper guide 18 and the reading platen roller 6 and the contact point between the supply guide member 8 and the reading platen roller 6. A detection sensor 23 is attached.

In addition, 24 in the figure is a recording head that constitutes a recording section,
In accordance with predetermined image information, this is recorded on a recording material (eg, plastic sheet) 26 that is conveyed by a recording platen roller 25.

Next, we will explain the operation of the device configured as described above in manuscript 3.
The following will focus on the state in which the image is conveyed in a U-turn by the reading platen roller 6.

First, when the original 3 is inserted from the original insertion slot 1 with its image information side facing down, the original presence/absence sensor 2 detects this.

When the start button (not shown) of the device is pressed in this state, the big amplifier roller 5 descends and rotates.
In cooperation with the lower document guide 4, the stacked documents 3 are separated one by one from the top and sent downstream.

The sent out document 3 is conveyed by the reading platen roller 6. Next, the state at this time will be explained in detail. First, when the start button of the device is pressed, the reading platen roller 6 is rotated counterclockwise. Rotate quickly.

When the original 3 is sent to the place in the above state, the original 3 is first guided by the supply guide member 8 and is moved around the reading platen roller 6 by the cooperative action of the supply guide member 8 and the reading platen roller 6. It is transported at a constant speed along the surface. Next, the original 3 is guided by the paper guide 18 and by the ejection guide member 11 to be conveyed in a U-turn around the circumferential surface of the reading platen roller 6, and the cooperation between the ejection guide member 11 and the reading platen roller 6 Accordingly, the document is discharged from the document discharge port 15.

Note that the leading and trailing ends of the document 3 transported in a U-turn as described above are located between the contact point between the supply guide member 8 and the reading platen roller 6 and the contact point between the paper guide 18 and the reading platen roller 6. While passing through, each document is detected by the document detection sensor 23, and this detection signal is transmitted to the pickup roller 5.

Immediately after the image information passes through the guide 18, the image information of the original document 3 is read by the small sensor 16, and the information is sent to the recording section of another device in the case of a facsimile operation, or to the own device in the case of a copy operation. The information is transmitted to the recording section.

<Example> Next, an example in which the discharge guide member 11 is made of an elastic body will be described.

When carrying out the present invention, the discharge guide member 11
If a thin spring plate material or an elastic member such as a Mylar sheet is used as the support member, and this is spot welded to the support member or adhered with double-sided tape, etc., the discharge guide member 11 and the small sensor 16 will come into contact with each other. Even if this happens, positional displacement of the small sensor 16 can be prevented. .

That is, if the ejection guide member 11 is made of a rigid body, the ejection guide member 1 may be damaged due to manufacturing errors or deflection of the member.
1 comes into contact with the small sensor 16, the position of the small sensor 16 will shift and the reading focus of the sensor 16 will be distorted. The above-mentioned error, deflection, etc. can be absorbed by the elasticity of the discharge guide member 11. Therefore, it is not necessary to provide a gap between the discharge guide member 11 and the small sensor 16 so that they do not come into contact with each other (or rather, the fourth
As shown in the figure (since the two can be brought into positive contact with each other, it is possible to more reliably guide the transported document 3 and also prevent the occurrence of jams, etc.).

In the above-described embodiment, the ejection guide member 11 and the ejection stay 13 were separated and attached by welding or pasting, but the ejection guide member 11 and the ejection stay 13 were configured integrally. You may.

Further, in the embodiment described above, as shown in FIG. 2, the supply guide member 8. Although the ejection guide member 11 and the ejection stay 13 are configured to span the entire width of the document conveyance path, they are stiff and stiff.
The irises are not limited to wide irises, and may be comb-like.

Furthermore, the rotating body for conveying the document 3 at a constant speed is not limited to the above-mentioned reading platen roller, but may also be a belt suspended on a pulley, for example.

<Effects of the Invention> As described above, the present invention is configured such that the supply guide member and the ejection guide member are pressed against the lower and upper circumferential surfaces of the rotary body, so that the document can be transferred to the circumferential surface of the rotary body without complicating the structure. The document can be guided in a U-turn along the same direction, and the document can be conveyed by the cooperative action of the supply guide member, the discharge guide member, and the rotating body without the need for any other drive system or conveyance system. Since the document can be read, the document conveyance and i-picking mechanism can be downsized.

Therefore, if the mechanism according to the present invention is incorporated into a facsimile machine or the like, the entire machine can be easily miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a facsimile machine incorporating a mechanism according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the configuration of a reading platen roller, a guide member, and an ejection stay.
FIG. 3 is an explanatory diagram of a small sensor, FIG. 4 is an explanatory diagram of an embodiment in which the discharge guide member is made of an elastic member, and FIG. 5 is an explanatory diagram of a conventional technique. 1 is the document insertion slot, 2 is the document presence sensor, 3 is the document, 4
1 is a lower document guide, 5 is a pickup roller, 6 is a reading platen roller, 7.11 is a spring, 8 is a supply guide member, 11 is an ejection guide member, 13 is an ejection stay, 14 is an exterior cover, 16 is a small sensor, 18 is a paper guide, 2
3 is a document detection sensor.

Claims (1)

[Claims] In an image reading mechanism that transports an original from upstream to downstream along the circumferential surface of a rotating body and reads image information of the original using a sensor during the transport, a supply guide member is placed upstream of the sensor on the rotating body. An image reading mechanism characterized in that the image reading mechanism is provided so as to be pressed against the surface of the rotating body, and a discharge guide member is provided downstream of the sensor so as to be pressed against the surface of the rotating body.