JP3447137B2 - 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 device used when copying the contents of a document or transmitting them by facsimile. In particular, the present invention relates to a document-conveying-type reading device that conveys a document by a belt or the like for reading, rather than a reading-optical-system moving type that moves a reading optical system to read the contents of a document.

[0002]

2. Description of the Related Art Conventionally, an example of a document conveying type of this type is a reading device 1 which has been already proposed by the applicant, as schematically shown in FIGS. 321389).

In the reading apparatus 1, an endless belt 2 is stretched in the front and rear directions (left and right in the figure) of the original conveyance direction, and a reading unit 4 is provided on the belt 2 in front of the original conveyance direction.
The reading unit 4 is biased by the spring 3 and pressed against the belt 2. The reading unit 4 includes a reading sensor 5 and opposite side plates 6 and 6 that support the reading sensor 5.
And the parallel roller shafts 7 and 7 supported by the side plates 6 and 6.
And a presser elastic roller 8 provided on the roller shafts 7
And a driving roller 9 having the same diameter as the pressing elastic roller 8 and provided at both ends of the roller shafts 7 and 7 to directly press the belt 2.

When the original is conveyed, the belt 2 is driven,
The belt 2 rotates the driving roller 9 to rotate the pressing elastic roller 8 on the same axis, and the original G is conveyed while pressing the original G with the pressing elastic roller 8, and the original content of the original G is read by the reading sensor 5
I was reading.

[0005]

By the way, in this type of reading device, in order to secure the stability of the document conveyance, the pressing elastic roller 8 is easily elastically deformed, and even when the document G is relatively thick, it is driven. The roller 9 was kept away from the belt 2.

However, in such a conventional reading device, the reading unit 4 is urged by the spring 3 and the belt 2 is urged.
When the original G having a relatively large thickness is conveyed, the pressing elastic roller 8 is largely elastically deformed as shown in FIG. 10, so that the thickness of the read original causes a gap between the reading sensor 5 and the original G. Was not kept constant, resulting in a decrease in reading accuracy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is, in a document-conveying-type reading device, a document is not conveyed poorly due to the lift of a driving roller, and the distance between the reading means and the document is kept substantially constant. It is to improve accuracy.

[0008]

For this reason, a document-conveying-type reading apparatus according to the present invention is a sheet such as an endless screen sheet 15 for conveying a placed document G, as shown in the following illustrated embodiment, for example. Reading member 2 provided on the sheet-like conveying member and urged by an elastic member such as a toggle spring 45 to be pressed against the sheet-like conveying member.
And a reading sensor 23 for reading the original content of the original G on the sheet-shaped conveying member.
And a supporting member such as the opposite side plate 22 that supports the reading unit, a roller shaft 25 supported by the supporting member, and a sheet G through the document G provided on the roller shaft 25. Pressing elastic roller 3 that presses against the conveying member
0, a rigid roller 40 having a diameter smaller than that of the press elastic roller 30 and provided on the roller shaft 25, and a roller having a diameter larger than that of the press elastic roller 30 and being provided on the roller shaft 25 and directly pressed to the sheet-like conveying member. It is characterized in that it is configured by a driving elastic roller 35 to hit.

According to a second aspect of the present invention, for example, as shown in the following illustrated embodiment, in the reading device according to the first aspect, one of the elastic members serves to turn the reading unit 20 into a sheet-like conveying member. Orientation and manuscript G
It is characterized in that it is also urged toward the conveyance direction (1).

[0010]

Then, for example, when making a copy, the original G is placed on the sheet-like conveying member, the sheet-like conveying member is driven, and the drive elastic roller 35 is rotated by the sheet-like conveying member so as to be on the roller shaft 25. The rigid roller 40 and the pressing elastic roller 30 are rotated, and the original G is conveyed while pressing the pressing elastic roller 30. At that time, the presser elastic roller 30 is
To the extent that the radius is larger than that of the rigid roller 40, the pressing portion against the original G is rotated while elastically deforming. At the same time, the drive elastic roller 35 directly presses against the sheet-shaped conveying member to rotate while elastically deforming the pressing portion against the sheet-shaped conveying member. Then, the document content of the document G is read by the reading means.

According to the second aspect of the present invention, the reading unit 20 is urged by the single elastic member toward the sheet-like conveying member and also in the conveying direction B of the document G.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a copy board which is an embodiment of the document feeding type reading apparatus of the present invention.

Reference numeral 10 in the drawing denotes a copyboard case. The case 10 includes a lower case 10a and a lower case 1 thereof.
It is formed in a relatively thin box shape with the upper case 10b above 0a, and a large rectangular original setting window 10c is provided on the front side.
Further, although not shown, a document discharge port 10d is provided on the side surface on the front side in the length direction.

In this copyboard, the drive roller 13 and the driven rollers 14 are arranged in the front and rear (left and right in the drawing) of the case 10 in the longitudinal direction with the roller shafts 11 and 12 oriented in the width direction, and the respective roller shafts are arranged. Both ends of 11 and 12 are supported by the support brackets 16, respectively. And both rollers 13 and 14
Hang the endless screen sheet 15 in between. Then, the driven roller 14 is urged by a spring (not shown) to stretch the screen sheet 15 between the rollers 13 and 14. Further, a back plate (not shown) is provided inside the screen sheet 15, the back plate is used to back the upper inner surface of the stretched portion of the screen sheet 15, and the front surface side of the backed portion is set from the document setting window 10c. It is exposed to the outside and has a flat handwritten surface 15a formed thereon.

Further, the copyboard includes a case 1
1, the sheet driving means A is provided on the upper side of the screen sheet 15 in FIG. The seat driving unit A includes a motor 17 and a gear train 18 that can be driven in the forward and reverse directions. A timing belt 19 is stretched between one pulley 18a of the gear train 18 and a pulley 11a provided on the roller shaft 11 of the drive roller 13.

Therefore, the reading unit 20 is provided above the screen sheet 15 on the front side in the longitudinal direction (left side in FIG. 1) in the case 10. The reading unit 20 is a case 1
0 has a reading sensor 23 having an elongated box shape in the width direction,
Both ends of the reading sensor 23 are connected to the opposite side plates 22.2, respectively.
Fixed to 2 and supported by them.

Further, as shown in FIG. 2, the reading unit 20 has roller shafts 25, 25 arranged on both front and rear sides with a reading sensor 23 interposed therebetween, and these roller shafts 25, 25 are formed by the opposite side plates 22, 22. Support rotatably. As shown in FIG. 3, on the opposite side plates 22 and 22, a positioning pin 26 and a spring hooking pin 27 are vertically erected outward at the center thereof.

Further, the reading unit 20 includes the roller shaft 2
A plurality of presser elastic rollers 30 are provided on 525 at intervals, and drive elastic rollers 35 are provided at both ends of the same roller shaft 25. Presser elastic roller 3
The 0 and the drive elastic roller 35 are both made of an elastically deformable material such as rubber or sponge. Driving elastic roller 35
Is formed to have a diameter larger than that of the pressing elastic roller 30 as shown in FIG. 4, and is arranged at a position outside the handwriting surface 15a in the width direction.

A rigid roller 40 is provided on the roller shaft 25 together with the driving elastic roller 35 and the pressing elastic roller 30. The rigid roller 40 is made of a hard resin or rubber that does not elastically deform, and has a smaller diameter than the pressing elastic roller 30.

The reading unit 20 described above is wholly held by the mounting bracket 31 shown in FIG. 3 and supported by the case 10. The mounting bracket 31 has elongated holes 31b and 31c vertically formed at the center of the T-shaped support plate portion 31a, and a spring hooking pin 32 is erected outward at the side of the elongated hole 31b. Thus, the mounting bracket 31 has a mounting plate portion 31d for screwing that is bent at a right angle to the upper side in FIG. 3, and as shown in FIG.
It is screwed to.

The long hole 3 of the mounting bracket 31
1b penetrates the positioning pin 26, the oblong hole 31c penetrates the spring hooking pin 27, one end of the toggle ring 45 is hooked on the circumferential groove of the tip of the spring hooking pin 27, and the other end of the spring hooking pin 32 is pushed. It hangs on the circumferential groove. Then, the reading unit 20 is constantly urged obliquely downward (in the direction of arrow B in FIG. 5) against the screen sheet 15 by the toggle sling 45 to press the presser elastic roller 30 and the drive elastic roller 35 against the screen sheet 15. It becomes. In that state,
The drive elastic roller 35 is elastically deformed such that the pressing portion is excessively crushed by the radius larger than that of the pressing elastic roller 30.

In the copy board described above, as shown in FIG.
A thermal printer B is provided, and a thermal roll paper P for recording with the printer is provided on the upper side of the thermal printer B in FIG.

The copy board described above is used, for example, in a state of being placed on a table. And first,
When making a copy of a document of a certain thickness using this copy board, the document is placed on the handwriting surface 15a. Then, the leading end is pressed against the elastic roller 30, and the document is set on the basis of the center or one side.

Thereafter, although not shown, the copy switch is pressed to start copying. And the seat driving means A
The motor 17 is driven to operate the screen sheet 15, and the drive elastic roller 35 is rotated by the screen sheet 15 to coaxially move the rigid roller 40 and the press elastic roller 3.
0 is rotated, and the original G is conveyed while being pressed by the pressing elastic roller 30 as shown in FIG.

When the original is conveyed, however, the pressing elastic roller 30 rotates while elastically deforming the portion pressed against the original. At the same time, the drive elastic roller 30 directly presses against the sheet 15 and rotates while elastically deforming the pressing portion against the screen sheet 15. Then, in synchronization with the rotations of the rollers 30 and 35 and the rollers 40, the reading sensor 23 reads the original contents of the original G, and the thermal roll paper P is appropriately pulled out by the paper conveying means and the read contents are reduced by the thermal printer B. Record.

Then, although not shown, the recorded roll paper P is discharged upward from the paper discharge port and cut into a proper length. On the other hand, the read document G is horizontally discharged from the document discharge port 10d.

Further, when making a copy of a relatively thin original, when the original is pressed by the pressing elastic roller 30 and the drive elastic roller 35 is directly pressed against the screen sheet 15, the pressing portion is similarly excessive. Rotate in the state of being crushed.

On the other hand, when the original G is relatively thick such as cardboard, the driving elastic roller 30 is elastically deformed to bring the pressing elastic roller 30 into contact with the original G during conveyance, and the pressing elastic roller 30 and By elastically deforming the drive elastic roller 30 to bring the rigid roller 40 into contact with the document G, the pressing elastic roller 30 is elastically deformed and rotated within a limit of a radius larger than the rigid roller 40.

The copy board can also be used as a handwriting board. In that case, a drawing tool such as a water-based pen is used to draw a picture or a character on the handwriting surface 15a. The handwritten content can be written on the handwriting surface 1 by wiping the board as appropriate.
It can be erased by wiping 5a. Further, when it is desired to continuously draw an image on the new handwriting surface 15a without erasing the picture in front of it, although not shown, the sheet feed key and the sheet return key are operated to drive the screen sheet 15 forward and backward appropriately. Then, the screen sheet 15 is sent and the handwritten surface 15a on which nothing is written is extended.

Further, in this copy board, when it is desired to save the handwritten contents drawn on the handwriting surface 15a, the copy switch is pressed to drive the screen sheet 15 as described above, while moving the handwriting surface 15a in the carrying direction (a). ,
The handwritten content is read by the reading sensor 23, and the read content is recorded on the thermal roll paper P by the thermal printer B to obtain a copy. Then, even when the screen sheet 15 is simply moved without placing the original document,
The drive elastic roller 35 is rotated in a state in which its pressing portion is crushed by an amount having a larger radius than the pressing elastic roller 30.

In the illustrated embodiment described above, the sheet-like conveying member is constituted by using the resin screen sheet 15, but the present invention is not limited to this, and it may be constituted by using a rubber belt or the like.

[0032]

Therefore, according to the present invention, in the document conveying type reading device, the rigid roller having a diameter smaller than that of the pressing elastic roller pressed against the sheet conveying member via the document is provided on the same roller shaft. Therefore, when the original is conveyed while being pressed by the pressing elastic roller, the elastic deformation amount of the pressing elastic roller is regulated by the rigid roller.
When the original to be read is thick as in the past, it prevents the pressing elastic roller from being elastically deformed so much that the distance between the reading unit and the original is displaced, and thus the distance between the reading unit and the original is prevented regardless of the thickness of the original. It is possible to improve the reading accuracy by keeping the distance of 1 substantially constant.

At this time, a thick elastic original is provided because a drive elastic roller having a diameter larger than that of the pressing elastic roller is provided on the roller shaft and directly pressed against the sheet-shaped conveying member together with the rigid roller and the pressing elastic roller. It is also possible to prevent the driving elastic roller from floating from the sheet-shaped conveying member even during the conveyance of, and to prevent the conveyance failure of the document due to the floating of the driving elastic roller.

According to the second aspect of the present invention, the one elastic member constantly urges the reading unit toward the sheet-shaped conveying member and also urges it toward the original conveying direction. It is possible to prevent the document reading position of the reading unit from being displaced in the front and rear of the document transport direction due to vibration or backlash that occurs when driving the sheet-shaped transport member, thereby improving the reading accuracy. .

[Brief description of drawings]

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

FIG. 2 is a schematic vertical sectional view thereof.

FIG. 3 is an exploded perspective view of a reading unit, a mounting bracket, and a toggle spring included in the copy board.

FIG. 4 is a partially enlarged view comparing sizes of a pressing elastic roller, a rigid roller, and a driving elastic roller on a roller shaft provided in the reading unit.

FIG. 5 is an explanatory view of a mounting state of the reading unit urged by a toggle spring.

FIG. 6 is a state explanatory view showing a document pressing state of a pressing elastic roller and a screen sheet pressing state of a driving elastic roller in the reading unit.

FIG. 7 is a schematic cross-sectional view of a conventional document feeding type reading device.

FIG. 8 is a schematic vertical sectional view thereof.

FIG. 9 is a state explanatory view showing a conveyance state of a thick original document in the conventional reading device.

FIG. 10 is a state explanatory view showing an elastically deformed state of the pressing elastic roller at the time of reading a thick original.

[Explanation of symbols]

15 Screen sheet (sheet-shaped conveying member) 20 reading unit 22 Opposing side plate (support member) 23 Reading sensor (reading means) 25 roller shaft 30 Presser elastic roller 35 Drive elastic roller 40 rigid roller 45 Toggle spring (elastic member) G manuscript B. Document transport direction

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Claims (2)

(57) [Claims] 1. An endless sheet-like conveying member for conveying a placed document, and a reading unit provided on the sheet-like conveying member and biased by an elastic member to press the reading unit. Reading means for reading the original contents of the original on the sheet-shaped conveying member, a supporting member for supporting the reading means, a roller shaft supported by the supporting member, and a roller shaft provided on the roller shaft for interposing the original document through the original document. A pressing elastic roller to be pressed against the sheet-shaped conveying member, a rigid roller having a diameter smaller than that of the pressing elastic roller and provided on the roller shaft, and a roller having a diameter larger than the pressing elastic roller and provided on the roller shaft to directly form the sheet-like member. A document-conveying-type reading device that is composed of a drive elastic roller that is pressed against a conveying member. 2. The original conveying type according to claim 1, wherein the one elastic member urges the reading unit toward the sheet conveying member and also in the conveying direction of the original. Reader.