JPH05103149A - Picture reading device - Google Patents

Abstract

PURPOSE:To perform the positioning of the space between the reading part and the carrier route of a picture reading device by a simple constitution. CONSTITUTION:A protruding part 13a of a moving plate 13 passes through a slit 14a of a chassis and an oblong hole 15a of a plate spring 15 and the plate spring 15 is fixed to the chassis 14 with a screw 16. Therefore, the moving plate 13 is movable in the longitudinal direction of the slit 14a and the oblong hole 15a and is mounted on the chassis 14 freely rotatably. When a carrier route is closed since the plate spring 15 always presses the moving plate 13 in a fixed direction, a rib 13b of the moving plate 13 hits on a fixing plate 12, the space of a reading part 17 and a moving plate 15 is determined by the height of the rib 13b and the space always becomes a fixed one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device such as a scanner used in facsimiles and various information devices.

[0002]

2. Description of the Related Art In recent years, with the improvement of functions of information equipment,
A so-called image reading device, which inputs information by reading an image, is becoming widespread. FIG. 4 is a diagram showing a conveyance path of a document of a conventional image reading apparatus. Here, 101 is a separation roller, 102 is a separation pad, and 10
3 to 110 are rollers, 111 and 112 are plates, 1
Reference numeral 13 is a reading unit.

As a constitution, a sheet feeding means composed of a separation roller 101 and a separation pad 102, and rollers 103 to 11
0 is a driving unit, first and second restricting units are plates 111 and 112, and a conveyance unit that forms a document conveyance region and a reading unit 113 are formed. Next, the operation will be described. The original document separated by the sheet feeding unit is guided to the transport path formed by the transport region including the plates 111 and 112, and the rollers 103 and 104 are provided.
Then, it is carried to the reading unit 113 by being driven by a roller pair composed of the rollers 105 and 106. The original read here is the rollers 107, 108 and the roller 1.
The sheet is discharged by a roller pair composed of 09 and 110.
Here, the transport path is jammed with paper (so-called jamming)
However, since it is the most problematic, in general, the distance between the plate 111 and the plate 112 is set sufficiently larger than the thickness of the paper. However, the reading unit 113
When reading a document, the reading section 113 and the document cannot be read if they are too far apart. This is due to the performance of the reading unit 113, especially the depth of focus. Therefore, as shown in FIG. 4, the uneven portion 1 is formed so that a portion (1 mm or less) of the interval of the transport path is formed in a part of the plate 111.
11c is provided. The plate 111 has a boss 111a and a rib 112a provided on the plate 112 so that the original can be removed when a paper jam occurs.
It is rotatably supported in the hole of, and the transport path can be opened as shown in FIG. Normally, as shown in FIG. 4, the ribs 111b keep a constant distance.

However, in the above-mentioned conventional structure, there is a problem that the interval between the reading portion 113 and the uneven portion 111c of the plate 111 varies due to warpage or distortion of the plates 111 and 112. Therefore, there is an image reading apparatus configured as shown in FIG. This is a plate with a different configuration only for the portion where the interval of the transport path is important. Plates 124, 125 in a portion where a sufficient space can be taken
Plate 1 that is fixed and faces the reading unit 129
26, the shaft 130 is the slot 12 of the chassis 127.
It is fixed through 7a, together with the shaft 130,
It is movable along the long hole 127a. However, normally, the spring 128 constantly urges it toward the reading unit. FIG. 7 is a side view showing an attached state of the plate 126. In this configuration, the plate 126 has the rollers 118 and 120. Therefore, when the transport path is closed, the roller 118 is connected to the roller 119 and the roller 12 is rotated.
Positioning is performed because 0 abuts on each roller 121.

[0005]

However, the conveying path of the conventional image reading apparatus as shown in FIGS. 6 and 7 has a complicated structure, a large number of parts, and poor assemblability. The present invention has been made in consideration of the above problems, and an object of the present invention is to provide an image reading apparatus in which a document is stably read and which has a simple structure.

[0006]

In order to achieve the above object, in the image reading apparatus of the present invention, the conveyance path of the document is determined in the conveyance area by the first and second regulation means, and the first regulation means In an image reading apparatus having a reading unit for reading an image of a document on a surface thereof, a portion of the second restricting unit facing the image reading unit is movable and a conveyance moving unit having a plurality of interval protrusions and the conveyance vibrating unit. It is composed of an urging means for urging the sheet, and the conveyance area of the document is determined by this interval protrusion.

[0007]

In the image reading apparatus of the present invention having the above-described structure, the original at the position where the reading section is arranged is conveyed to the conveyance area determined by the height of the interval protrusion provided on the conveyance moving section. .. That is, since the sheet is conveyed in the space determined by the height of the interval protrusion, the distance between the reading section and the reading section is kept stable and reliable reading is achieved. It is because the conveyance moving portion is always urged in the direction of the first regulating means by the urging means, and the interval projection is pressed against the portion of the first regulating means, so that the distance between the first regulating means and the conveying movement portion is always Is determined by this interval protrusion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the construction of a conveyance path of an image reading apparatus according to an embodiment of the present invention, in which 1 is a separation roller and 2
Is a separation pad and constitutes a paper feeding means. Three
Numerals 4, 5, 6, 7, 8, 9, 10 are rollers, which are driving means for conveying the original. Reference numerals 11 and 12 denote fixed plates as first and second restricting means, 13 denotes a moving plate which is a moving / conveying unit forming a part of the second restricting means, and 14
Is a chassis (indicated by a broken line) integrated with the fixed plate 11. 15 is a leaf spring which is a biasing means,
6 is a fixing screw, and 17 is a reading unit.

The operation of this embodiment configured as described above will be described. In FIG. 1, the protrusion 1 of the moving plate 13
3a is a slit 14a of the chassis 14 and a leaf spring 15
And the leaf spring 15 is fixed to the chassis 14 with a screw 16. Therefore, the moving plate 13 is movable in the longitudinal direction of the slit 14a and the long hole 15a, and is rotatably attached to the chassis 14. Further, as shown in FIG. 3, the leaf spring 15 is
The moving plate 13 is constantly pressed in a fixed direction (in this case, the reading unit direction). Here, when the transport path is closed, the fixed plate 12 is provided with the ribs 13b provided on the moving plate 13 and serving as spacing protrusions that determine the gap of the transport path.
At this time, the moving plate 13 moves against the biasing force of the leaf spring 15 to be in the state of FIG. At this time, the distance between the reading unit 17 and the moving plate 15 is determined by the height of the rib 13b, and is always a constant distance.

For this reason, the original is conveyed in the conveyance area having the constant interval, so that the distance between the reading section 17 and the original is kept stable, and reliable reading becomes possible.

When the moving plate 13 is assembled, it is first inserted into the slit 14a, and then the leaf spring 15 is fixed to the chassis 14 with the screw 16 so that the protruding portion 13a is guided in the elongated hole 15a. As a result, a reliable moving and conveying unit can be configured with a small number of parts.

[0012]

As is apparent from the above description, the reading apparatus of the present invention is provided with the movement control section having the interval protrusions for restricting the original conveyance area of the portion where the reading section is provided, and the restriction thereof. The urging means for urging is provided. Therefore, it is possible to realize an image reading apparatus in which the reading unit keeps the distance of the document stable and realizes reliable reading, and the number of parts is small and the assembling work is easy.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a document conveyance path of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the conveyance path of the reading apparatus of the embodiment is closed.

FIG. 3 is a cross-sectional view showing a mounting state in the vicinity of a moving plate of the reading apparatus of the embodiment.

FIG. 4 is a side view showing a configuration of a document conveyance path of a conventional first image reading apparatus.

FIG. 5 is a side view showing a state in which a conveyance path of the conventional image reading apparatus is opened.

FIG. 6 is a side view showing a configuration of a document conveyance path of a second conventional image reading apparatus.

FIG. 7 is a front view of a plate of a conveyance path of the conventional image reading apparatus.

[Explanation of symbols]

 1 Separation roller 2 Separation pad 3-10 Rollers 11, 12 Fixed plate 13 Moving plate 13a Projection part 13b Rib 14a Slit 14 Chassis 15 Leaf spring 17 Reading part

Claims (2)

[Claims] 1. A paper feed unit for feeding a document, a drive unit for transporting the document fed by the paper feed unit, and first and second regulating a transport region of the document transported by the drive unit. A second restricting means, and a reading unit arranged on the surface of the first restricting means for reading the image of the original.
The second restriction means of the portion facing the reading unit is movable and is composed of a conveyance moving section having a plurality of interval protrusions and a biasing means for biasing the conveyance moving section,
An image reading apparatus in which the transport area is determined by the spacing protrusions. 2. The urging means is composed of a leaf spring having one end fixed to the second restricting means, and the transport moving section has a protrusion in a direction perpendicular to the direction urged by the urging means. The image according to claim 1, wherein a slit is formed in the second regulating means, the leaf spring has an elongated hole on a surface facing the slit, and the protrusion is guided by the slit and the elongated hole. Reader.