JP3343797B2 - Document transport type reading device - 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 used for copying or facsimile transmission of original contents. In particular, the present invention relates to a document transport type reading device which transports a document by a document transport belt and reads the document, instead of a reading optical system moving type which reads a document by moving a reading optical system.

[0002]

2. Description of the Related Art Conventionally, among this type of original transport type, there is a reading apparatus 1 which is schematically shown in FIG. 6, for example, and has already been proposed by the applicant (Japanese Patent Application No. 321 of 1993).
No. 389).

The reading device 1 stretches an endless original conveying belt 2 in the original conveying direction A and before and after the original conveying direction A (left and right in the figure), and is coaxially fixed to the front side of the original conveying belt 2 in the conveying direction A in the same direction. The original pressing roller 3 and the traveling rollers 4 on both sides thereof are pressed against each other, and at the time of transporting the original, the original transport belt 2 is driven to transport the original G. The original G is pressed by the original pressing roller 3 and the traveling roller 4 is pressed. The document G is rotated integrally with the press roller 3, and the reading sensor 5 reads the content of the document G in synchronization with the rotation of the traveling roller 4.

[0004]

However, in such a conventional reading apparatus, since the original pressing roller 3 and the traveling roller 4 have the same diameter, for example, as shown in FIG. At the time of conveyance, the traveling rollers 4 together with the original pressing rollers 3 move the original conveying belt 2 by the thickness of the original G.
Floats away from you. Then, the traveling roller 4
Cannot be rotated in accordance with the transport speed of the original transport belt 2, so that the original content of the original G cannot be read by the read sensor 5 in synchronization with the original transport belt 2, and as a result, the read image quality Had been reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the quality of a read image due to the lifting of a traveling roller pressed against a document conveying belt when a thick document is conveyed in such a document conveying type reading apparatus. Is to prevent

[0006]

For this purpose, a document conveying type reading apparatus according to the present invention comprises a document conveying belt such as a conveying belt 15 for conveying a placed document G, as shown in the following embodiment. And a document pressing roller 25 pressing the document G conveyed by pressing the document conveying belt against the document conveying belt.
The document is read by the original pressing roller 25.
The radius r is equal to the thickness of the original G having the maximum thickness
Large, pressing the document pressing roller 25 directly to the original convey belt fixed coaxially, that when elastically deformed
The original holding roller 25 can hold the original G
And a reading means such as a reading sensor 20 for reading the contents of the original G conveyed by the original conveying belt in synchronization with the rotation of the traveling roller 30. .

[0007]

When taking a copy, for example, the original G is placed on the original transport belt, and the original transport belt is driven.
The placed document G is transported. Then, the original G conveyed by the original conveying belt is pressed by the original pressing roller 25. At this time, the traveling roller 30
The document G is read by reading means in synchronism with the rotation of the traveling roller 30 while constantly pressing the document conveying belt directly and rotating it while elastically deforming the portion pressed against the document conveying belt.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an external configuration of a copy board which is an embodiment of the original transport type reading apparatus of the present invention.

Reference numeral 10 in the figure indicates the case of the copy board. The case 10 is formed in a relatively thin and slightly long box shape with a bottom plate (not shown) and an upper case 10a on the bottom plate, and a large rectangular writing window 10b and a long groove 10c for holding a handle and writing instrument are provided on the front side. Although not shown, a document discharge port is provided on the front side in the longitudinal direction, and a manual paper feed port is provided thereon, and the manual paper feed port and the writing window 10b are provided.
A cover 11 is provided between them.

The cover 11 is formed to be long in the width direction of the case 10, and has an elongated paper discharge port 11a provided on the upper surface thereof, a copy switch 12 provided thereon, and a lower side of the rear side opposite to the document discharge port. A document feed port 11b is provided in the width direction of the case 10.

As shown in FIG. 3, the copy board has a drive roller 13 and a driven roller 14 arranged in the width direction on both sides in the longitudinal direction (left and right in the figure) of the case 10. Both ends of these roller shafts are supported by opposed side plates (not shown). Then, an endless transport belt 15 is stretched between the rollers 13 and 14. Thus, a back plate (not shown) is provided inside the conveyor belt 15, and the back plate backs the upper inner surface of the stretched portion of the conveyor belt 15, and the front side of the backed portion is viewed from the writing window 10b. It faces the outside and sets it as a flat handwritten surface 15a.

Although not shown, the copy board is provided with a motor that can be driven forward and backward, and the driving force is transmitted to the drive roller 13 so that the transport belt 15 can be driven.
Then, on the right side in FIG. 2 of the long groove 10c of the upper case 10a,
Belt feed key 1 for switching the driving direction of the above-mentioned motor
6 and a belt return key 17 are provided.

Further, the copy board is provided with a reading sensor 20 in the cover 11 as shown in FIG. The reading sensor 20 is elongated in the width direction of the case 10, and both ends are fixed to the supporting plate member 21 and supported by the supporting plate member 21. A document pressing roller 25 is provided on both front and rear sides of the reading sensor 20.

As shown in FIG. 3, the support plate member 21 has an arm portion 21a extending in the longitudinal direction of the case 10, and the arm portion 21a, as shown in FIG. The roller 25 is rotatably supported. Further, a traveling roller 30 is fixed to both ends of each roller shaft 26 to which the original pressing roller 25 is fixed, at a position outside of the maximum size original G in the width direction.

The traveling roller 30 has a larger radius r than the original pressing roller 25, and is made of a material that can be elastically deformed by at least the larger amount, such as polyurethane.

Then, as shown in FIG.
1 is pressed against the urging spring 31 from above.
And presses the original pressing roller 25 and the traveling roller 30 against the transport belt 15. In this state, the traveling roller 30 is elastically deformed so that the pressed portion thereof is crushed by the radius r larger than that of the document pressing roller 25.

Although not shown, the copy board is provided with a recording device of a thermal type, for example, for recording on a recording sheet in the cover 11, and a transport roller for transporting the recording sheet to the recording device. Paper transport means.

The copy board having the above-described configuration is used while being placed on, for example, a table or the like. First, when using as a handwriting board, a picture or a character is written on a handwriting surface 15 using a writing instrument such as an aqueous pen.
Draw on a. The handwritten contents can be erased by appropriately wiping the handwritten surface 15a with a board wiper. Also,
New handwritten surface 1 without erasing the previous pictures etc.
If you want to draw an image on 5a, use the belt feed key 1
6 and the belt return key 17 are operated to
Is appropriately driven in the forward and reverse directions, and the conveying belt 15 is fed to draw out the handwritten surface 15a on which nothing is written.

When using this copy board to copy a relatively thick original such as cardboard, for example,
As shown in FIG. 1, the original G is placed on the handwritten surface 15a. Then, the leading end abuts against the document pressing roller 25, and the document G is set, for example, on the basis of the center. on the other hand,
The recording paper is set with its leading end abutting between the thermal head and the platen of the recording means, for example, through the above-described manual paper feed port.

Thereafter, the copy switch 12 is pressed to start copying. Then, the drive motor is driven to move the conveyance belt 15 to convey the document G in the direction of arrow A in FIG. 1, and the recording paper is sent out by the above-described paper conveyance means. At this time, as shown in FIG. 4, the original G entering through the original inlet 11b is pressed by the original pressing roller 25, and the traveling roller 30 is directly pressed against the transport belt 15 to rotate. The original pressing roller 25 also rotates together with the original 30. And those rollers 25 and 30
The reading content of the document G is read by the reading sensor 20 in synchronization with the rotation of, and the read content is recorded on a recording sheet at an equal magnification by a recording unit. Then, as shown in FIG. 2, the recorded sheet S is discharged upward from the sheet discharge port 11a, and the read original G is discharged laterally from the original discharge port.

On the other hand, when making a copy of a relatively thin original, as shown in FIG.
5, when the traveling roller 30 is directly pressed against the transport belt 15, the traveling roller 30 is rotated with its pressed portion slightly collapsed.

Further, in the copy board of the illustrated embodiment,
When you save a handwritten content drawn in the handwriting surface 15a is
Press the copy switch 12 to drive the conveyor belt 15,
While moving the handwriting surface 15a in the direction of the arrow A, the handwritten content is read by the reading sensor 20, and the read content is recorded on the recording paper S by the recording means to obtain a copy. In the case where the transport belt 15 is merely moved without placing the document, the traveling roller 30 is similarly pressed in a state where the pressed portion thereof is crushed by the radius r larger than the document pressing roller 25. Rotate.

In the present invention, the original pressing roller 25 and the traveling roller 30 are connected to the transport belt 15.
It is preferable to adopt a configuration that can be appropriately separated from. And
When the original G is transported to the reading position to make a copy, the rollers 25 and 30 are set to the pressing positions for pressing the original G and the transport belt 15, respectively. Otherwise, the rollers 25 and 30 are stained with the handwritten contents. The rollers 25 and 30 are moved to a retreat position away from the handwriting surface 15a so that they do not exist.

[0024]

Therefore, according to the present invention, in a document conveying type reading apparatus for pressing a traveling roller coaxial with a document pressing roller against a document conveying belt and reading the contents of a document in synchronization with the rotation thereof, Set the roller to the maximum thickness that can be scanned compared to the original holding roller.
The radius is large by the thickness of the manuscript,
When the original is pressed, it is elastically deformed and the original
Since it is possible to hold the original , the traveling roller and the original
As long as the original is thicker than the radius difference from the feed roller, even when transporting a thick original, the traveling roller can be prevented from lifting up from the original transport belt as in the conventional case. It is possible to prevent the read image quality from deteriorating.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a copy board according to an embodiment of the present invention.

FIG. 2 is an external perspective view thereof.

FIG. 3 is a schematic longitudinal sectional view thereof.

FIG. 4 is a state explanatory view showing a document pressing state of a document pressing roller and a belt pressing state of a traveling roller when reading a thick document.

FIG. 5 is an explanatory diagram illustrating a document pressing state of a document pressing roller and a belt pressing state of a traveling roller when reading a thin document.

FIG. 6 is a schematic cross-sectional view of a conventional reading device.

FIG. 7 is an explanatory diagram showing a state in which a traveling roller of the reading apparatus is lifted when reading a thick original.

[Explanation of symbols]

 15 Conveying belt (document conveying belt) 20 Reading sensor (reading means) 25 Document pressing roller 30 Running roller G Document r Radius of running roller

Claims (1)

(57) [Claims] An original transport belt that transports a loaded original, an original pressing roller that presses the original that is conveyed by pressing against the original transport belt, and a document that can be read by the original pressing roller.
The radius of the original having the maximum thickness is increased by the thickness of the original, and is fixed coaxially with the original pressing roller and directly pressed against the original conveying belt .
And a reading means for reading the contents of the original conveyed by the original conveyance belt in synchronization with the rotation of the traveling roller. Reader.