JPS59108447A - Original reader - Google Patents

Abstract

PURPOSE:To attain miniaturization of the reader, and to cope with a trouble such as jaming of an original and to attain the separate manufacture of a reading unit by separating the reader as a unit from the main body, and opening the unit using the depth of the reader as a fulcrum. CONSTITUTION:A reflected light of an original 1 lighted by a lighting light source 6 is reflected at a right angle in the direction of original carrying via the 1st mirror 27 and the 2nd mirror 28 and the image is formed on a photodetecting element 9 via a lens 8. Components above the original plane for original carrying (original feeding auxiliary roller 3, belt 30, upper feeding roller 4a, and upper side paper discharge roller 5a), lighting optical system 6, reflecting optical system (mirrors 27, 28), image forming optical system 8, and the photodetecting element 9 form the reading unit 22 as a whole, and they are provided fixedly to a base 31. This reading unit 22 is divided completely from the device main body C at the original carrying plane A to form the entire reader switchable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document reading device that reads the image information of a document.

However, the case where it is used in a facsimile machine will be explained below as an example.

In many conventional document reading devices, an optical system is disposed below the document to be read, as shown in FIG. 1. Here, FIG. 1 is a sectional view of the conventional document reading device.

In the figure, 1 is a document to be read, 2 is a separating part feeding roller, 3 is a separating part separating friction piece, 4 is two pairs of feeding rows, 5 is a pair of paper ejecting rollers, 6 is an illumination light source, and 7 is a reflective light source. 18 is a V lens, 9 is a light receiving element, 10 is a printed board for charging and conversion, 11 is a manuscript table, 12 is a manuscript tray, 13 is a printed board for control,
14 is a power source. The apparatus shown in FIG. 1 is a typical example of horizontal document conveyance and lower side reading, but such an apparatus has the following problems in particular. In other words, since the parts that make up the optical system are placed at the bottom of the document, a large space for the optical path must be taken up inside the device, and the size of the device is limited by the optical system and it is necessary to make the device compact. is difficult. Furthermore, since the optical system is located in the center of the device, it is difficult to configure only the reading υ optical system as one unit.

Furthermore, the structure of the casing had to be strengthened to make it stronger, and since it was a former school system, the entire device needed to be more rigid than necessary. Therefore, the entire device becomes heavy. Furthermore, in order to provide rigidity to the entire device, it is difficult to perform the adjustment of the material system separately as a unit, which limits the production process and makes it difficult to manufacture an inexpensive device. In addition, as shown in FIG. 1, when the reflecting mirror 7 faces upward, the influence of dust on the mirror on the image is large, and it is necessary to install a special device to clean the mirror. When not doing so, it could increase the frequency of service and cause an increase in costs.

Furthermore, like other conventional document reading devices, there is also a device which has a structure in which the full-length system is replaced in order to make the device compact.

In FIG. 2, 15 is a recording roll paper, 16 is an idle roller, 17 is a platen roller, 18 is a recording head, such as a thermal head, 19 is 2 pairs of JF paper rows, 2n
i! It is a recording paper tray.

In the case of such an apparatus, there are many cases in which the document is horizontally conveyed and makes a wide U-turn inside the apparatus, resulting in a long document conveyance path within the apparatus. Therefore, the probability of jamming was high (it tended to occur).

The present invention solves the above-mentioned problems of the prior art, and provides a document reading device that allows the device to be made smaller and that can easily deal with problems such as document jams.

Hereinafter, one embodiment of the present invention will be explained using the drawings.

3 to 6 show one embodiment of the present invention.

In the figure, 21 is a document guide, 22 is a reading unit,
23 is a display section, 24 is an auxiliary switch, 25 is an operation procedure display section, 26 is an operation switch, 27 is a first mirror, 2nd is a second mirror, 29 is a separation belt, 30 is a feed belt, 3
Reference numeral 1 designates a substrate which is the structure of the reading unit 22, 62 a reading unit cover, and 63 a document feed assisting row 2 that moves up and down.

As shown in FIG. 6, in the Re apparatus according to this embodiment, the original to be read 1 is inserted in the direction of the arrow with the reading surface 1a facing upward. Then, a document insertion signal is issued by the document detection means (not shown), and the auxiliary feed row 236 rotates as shown in FIG. Initial conveyance in the direction of arrow a.

At this time, the document is ejected onto the document tray 12 by the separation belt 29 and feed belt 30 of the document separation section, which rotate in opposite directions, passing through a reading position illuminated by, for example, a fluorescent light. .

Now, the reflection source of the manuscript 1 illuminated by the illumination monument 6 is the first one.
It is reflected by the mirror 27 horizontally to the document transport path A and in a direction opposite to the document transport direction a.

Further, the light is reflected by the second mirror 2-28 in a direction perpendicular to the document conveyance, and is detected by the lens 8 on the light receiving element 9, for example, CO.
The image is formed on D. After that, it is charged, converted, or copied.

Here, among the component parts for the above configuration, the parts above the original surface 1a for transporting the original (original transport assisting rods 33
．． Belt 30. Upper feeding roller 4a.

The side paper ejection row 25a), the illumination optical system (light source 6), the reflection source system (mit-27/28), the imaging system (lens 8), and the charging conversion unit (printed board 10) are all It is fixed on the substrate 31.

That is, the document reading Schnitt 22 is completely separated from the main body C of the apparatus at the plane A where the document is conveyed. That is, in this embodiment, as shown in FIG. 6, a fulcrum shaft 36 is provided in the main scanning direction of the document above the document conveyance direction so that the substrate 61 can be opened and closed.

A detailed explanation will be given below using FIG. 6. Note that FIG. M6 is a cross-sectional view seen from the front of the apparatus, and shows a cross-section on the back side of the document. In the figure, 64 is a support plate that is fixed to the board 61 on which the reading redundancy system is fixed. Also, 35 is a support plate that is rotatably attached to the main body C on the board 31. It is the casing of the apparatus main body C, and is a side plate that supports the row 2 and the like for conveying the original, and also functions as a support stand serving as a bearing for receiving the fulcrum 36.
When reading the document, the reading unit 22 is held against a reference surface 37a created according to the drawing by the support shaft 36, as shown by the solid line, thereby positioning the reading unit 22 in the rotational direction. ing.

In addition, in the event of a document jam or during maintenance such as replacement of parts fixed to the reading unit 22, such as a fluorescent light or document conveyance roller, the reading unit 22 rotates around the support shaft 36 as shown by the two-dot chain line. unit 2
2 can be opened.

In this embodiment, the support shaft 36, which is the center of rotation, is arranged through the axis of the drive-side row 5 (lower side) of the paper ejection roller pair 5, so that the rotation can be easily performed.

Further, in the embodiment described above, the reading w unit 22 is
The main unit C is provided with a support shaft on the two axes of the low axis on the paper ejection side, and the legs of the reading unit are mounted on the main unit C by external power at one or two positions on the document insertion side. In order to securely connect the reading unit to the main body - ITh5, a locking mechanism may be provided, or a mechanism may be added to make it easier to use the attraction force of a magnet, etc. to improve the ease of operation. It may be improved. In addition, the position of the fulcrum for opening and closing was set at the extension line of the axis of the paper ejection drive roller shaft in the above embodiment, but in order to ensure a large open space for jam removal, the position of the fulcrum for paper ejection on the drawing in FIG. It is also possible to take it to the upper left of the roller pair. Further, the drive sources such as the feed bell (3n) and the auxiliary feed shear roller 33, which require driving means included in the reading unit, may be provided within the reading unit. In addition, when transmitting from the main body of the apparatus, the support shaft may be provided as an idler as in this embodiment, or furthermore, a gear transmission with upper and lower divisions may be used. Further, in this embodiment, the opening direction is such that the document insertion side is opened upward, but it is also possible to provide a support shaft at the center of the apparatus and raise the paper ejection side upward.

As explained above, by separating the reading device as a unit from the main body and opening the unit using the rear side of the device as a fulcrum, the reading unit can be produced separately from the main body, and production can improve sex. Furthermore, the main body does not require external rigidity in all parts, and it is sufficient to maintain rigidity only at, for example, the three points that support the unit.
The cost is low (and even if a jam occurs, the reading unit can be opened upward, for example, and the document transport path where the jam occurs is completely opened, making it easy to clear the jam). .

Also, depending on the processing sequence of one device, it is also possible to perform partial scanning by setting the document so that it is conveyed halfway so that it reads from the part you want to read when setting the document for scanning. became. Furthermore, according to this embodiment, all of the reflecting mirrors can be constructed with their reflecting surfaces vertical or facing downward, which has the effect of reducing the possibility of troubles occurring in the optical system by reducing the amount of dust adhering to the mirror surfaces. . In addition, in this example, in order to match the element pitch of the light receiving element and the pixel pitch of the reading section, a lens is used to form a reduced image in a long optical path. Even if the pixel pitch is approximately 1:1 or a so-called contact type sensor with a low reduction ratio is replaced, the same effects as in this embodiment can be obtained by simply replacing the illumination light source, reflection means, lens, light receiving element, and contact type sensor. 5.

As described above, according to the present invention, it is possible to provide a document reading device that allows the device to be miniaturized and can easily deal with problems such as document jams.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a conventional reading device) FIG. 3 is an external view of an embodiment of the present invention, FIG. 4 is a perspective view of the reading unit shown in FIG. 3, and FIG. FIG. 6 is a sectional view of the reading unit. In the figure, 1... υ original to be read 22... Reading p unit 27
... 1st mirror 2nd @ fist / 2nd mirror 29 - Separation belt 60 ... - Feed belt 31 ... Board
32...Reading Schnitt cover 66...Document feed auxiliary roller 34...Support plate 35, fist, support leg 36
...Spindle applicant Canon Co., Ltd. 220-

Claims (1)

[Claims] (1) A holder that is rotatable with respect to the document transport path, an illumination light source provided on the nucleus holder, an optical system, and a light receiving means;
A document reading device comprising: a document conveying device; and an opening/closing device having a pivot in the document scanning direction for rotating the holder.