JPH05338846A - Ducument conveyor - Google Patents

Abstract

PURPOSE:To provide a document conveyor which can be miniaturized with simple constitution. CONSTITUTION:In a document conveyor 1 having a paper feeding portion 2 at which a plurality of documents S are separated and fed one by one and a read portion 8 at which the documents S are passed between a back roller 31 and a read plate 32 making contact with the back roller 31 so that the contents of the documents S are read, the read plate 32 is bent and makes contact with two different phases A, B of the back roller 31 so that a conveying force and an unloading force of the same feed speed v2 corresponding to the number of rotation of the back roller 31 can be obtained at the respective two phase portions A, B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document feeder such as a facsimile machine having an automatic paper feeding function.

[0002]

2. Description of the Related Art Generally, as a document feeder for a facsimile machine, there is known a document feeder which separates and feeds a plurality of documents one by one and reads the contents of the documents.

Conventionally, such a document conveying apparatus has been
3 and FIG. 4, the paper feed speed v₁Paper feed roller
paper feed section c having b, and this paper feed speed v₁Faster than
Sending speed v₂And a carrying section e having a carrying roller d of
Sending speed v₂Same discharge speed v ₂With the back roller f of
It was equipped with a reading section g.

That is, the document conveying apparatus a
When one or a plurality of documents S are inserted into the document insertion port h, the document detection switch i detects the document S and the operation is started.

Next, the document S is separated sheet by sheet by the separating piece j, and is fed from the sheet feeding position G to the conveying position H at the sheet feeding speed v ₁ by the sheet feeding roller b. At the carrying position H, the carrying roller d sends the document S at a faster carrying speed v ₂ . At this time, the paper feed roller b is configured to rotate by a one-way clutch, and the paper feed roller b is designed to idle even when the transport roller d feeds the document S at a fast transport speed v ₂ .

After that, the conveyance of the document S by the conveyance roller d is stopped when it reaches the standby position I where the position detection switch k is located. When a copy key or a transmission key (not shown) is pressed in this state, the transport speed v ₂
After the document is read at the reading position J, the conveyance is restarted at
Leave the original S ₂ is going to be discharged.

As described above, the above-mentioned conventional document feeder a
By making the feeding speed v ₂ of the feeding roller d faster than the feeding speed v ₁ of the feeding roller b, a predetermined interval is provided for each document S fed from the feeding unit c. Also,
Before and after the reading position J, the document S is conveyed at the same conveyance speed v ₂ of the conveyance roller d and the ejection speed v ₂ of the back roller f so that the document S can be accurately read at a constant speed. It was done. Further, the document S after reading is surely discharged by the back roller f. That is, with respect to the paper feed roller b having the paper feed speed v ₁ , the carry roller d having a carry speed v ₂ faster than the paper feed roller b and the back roller f having the discharge speed v ₂ which is the same as the carry speed v ₂
By providing and, the transporting force and the discharging force required for separate sheet feeding and accurate reading are ensured.

[0008]

[SUMMARY OF THE INVENTION] However, in the conventional document feeder a, in order to obtain the conveying force and ejection force of the document S, a conveying roller d conveying speed v _2,該搬the feed velocity v ₂ It is necessary to provide the back roller f having the same discharge speed v ₂ and drive these together with the paper feed roller b having the paper feed speed v ₁ , and as shown in FIG.
As a result, the driving mechanism n for connecting the persons becomes complicated, the production cost becomes high, and the original conveying device a itself becomes large in size.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a document feeder which can be downsized with a simple structure.

[0010]

SUMMARY OF THE INVENTION An original document conveying apparatus of the present invention for solving the above-mentioned problems includes a paper feed section having a paper feed roller for separating and feeding a plurality of originals one by one, and the originals. ,
What is claimed is: 1. A document conveying device, comprising: a back roller; and a reading unit that is arranged to read the contents of a document by passing between the reading plate in contact with the back roller, wherein the reading plate is bent and formed. The two phase portions are in contact with each other at different phases, and the two phase portions can obtain the conveying force and the discharging force at the same feeding speed according to the rotation number of the back roller, respectively.

[0011]

According to the present invention, since the reading plate is bent so as to be in contact with each other at two different phases of the back roller, the two phase portions have the same phase depending on the number of rotations of the back roller. It is possible to obtain the conveying force and the discharging force at the feeding speed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the entire structure of the document feeding device 1, and FIG. 2 shows a sectional view of the document feeding device 1 taken along the line I--I.

That is, the document feeder 1 includes a paper feed section 2 having a paper feed roller 23 for separating and feeding a plurality of documents S one by one, a back roller 31, and a back roller 31 for the document S. The reading unit 32 is arranged so as to read the content of the document S by passing it between the reading plate 32 in contact with the roller 31, and the reading plate 32 is bent to form two different phases of the rear roller 31. A and B are in contact with each other, and the two phase portions A and B are adapted to obtain the conveying force and the discharging force at the same feed speed v ₂ according to the number of rotations of the back roller 31, respectively. is there.

The paper feed unit 2 includes a paper feed roller 23 having a rubber roller 22 fixed to the outer peripheral surface of a rotary shaft 21. The rotary shaft 21 of the paper feed roller 23 is connected to a paper feed gear 24 via a one-way clutch (not shown). Then, the rotating shaft 21 and the paper feeding gear 24 are idled in the R1 direction and connected in the R2 direction by a one-way clutch (not shown) mechanism so that the rotating shaft 21 and the paper feeding gear 24 are connected.
And are designed to rotate together. A separating piece 25 is pressed against the rubber roller 22 by a leaf spring 26. Then, the original S separated by the separating piece 25 is attached to the rubber roller 2 by the side portions 27 of the leaf spring 26.
By pressing down on 2, the document S is fed in the arrow F direction at a feeding speed v ₁ according to the number of rotations of the feeding roller 23.

At the position of the paper feed section 2 on the paper feed base end side,
An original detection switch 4 and a size detection switch 5 are provided to detect the presence / absence of the original S fed into the paper feed unit 2 and the size of the original S.

The reading unit 3 comprises a back roller 31 having a rubber roller 34 fixed to the outer peripheral surface of the rotary shaft 33, and a reading plate 32 adapted to be in contact with the rubber roller 34 of the back roller 31. Of these, the back roller 31 is
A back gear 35 provided on the rotating shaft 33 is adapted to rotate. Further, the reading plate 32 is bent and formed in a U-shaped cross section, and the back roller 31 can be arranged inside thereof. Further, in this arrangement, the rubber roller 34 of the back roller 31 and the reading plate 32 are in contact with each other at two different phases A and B of the back roller 31. Further, a reading device 8 such as a CCD is provided at a reading position C intermediate between the phases A and B. The reading device 8 uses the reading plate 32 to read the document S at the reading position C.
The reading is done. Then, in the phase A portion, the reading plate 32 presses the document S against the rubber roller 34, and the back roller 31
Thus, the transport speed v ₂ corresponding to the rotation speed of is obtained.
Also in the portion of the phase B, the read original S becomes to be pressed against the rubber roller 34 by a plate 32, in accordance with the rotational speed of the rear roller 31, and that the same discharge speed v ₂ and the conveying speed v ₂ is obtained Become.

A document position detection switch 6 for the document S is provided at a standby position D before the document S from the paper feed unit 2 is conveyed to the reading unit 3, and the document S from the paper feed unit 2 is read. Part 3
The document S is placed in a standby state before being introduced into the.

In the sheet feeding section 2 and the reading section 3, the sheet feeding gear 24 and the rear gear 35 are provided with a drive gear 72 fixed to a drive shaft 71 of a drive motor (not shown) and drive transmission gears 73 and 74. It is designed to mesh with each other. The feed roller 23 rotates in the R1 direction and the back roller 33 rotates in the R2 direction with respect to the rotation of the drive gear 72 in the R1 direction.

However, the paper feeding speed v ₁ accompanying the rotation of the paper feeding roller 23 is the conveyance speed v ₂ accompanying the rotation of the back roller 31.
The gear ratio of each gear is set so as to be slower than the discharging speed v ₂ .

Next, the operation of the document feeder 1 will be described.

First, when one or a plurality of originals S are inserted into the original insertion port 28, the original detection switch 4 causes the original S to move.
And the size detection switch 5 detects the size of the document S and the operation is started.

Then, the document S is separated sheet by sheet by the separating piece 25, and the sheet is fed at the sheet feeding speed v ₁ by the sheet feeding roller 23.

Thereafter, the conveyance of the document S by the paper feed roller 23 is stopped when the paper feed position E reaches the standby position D where the position detection switch 6 is located.

When a copy key or a transmission key (not shown) is pressed in this state, the conveyance is resumed at the conveyance speed v ₁ and the document S is introduced into the reading section 3.

In the reading section 3, first, at the position of the phase A, the back roller 31 feeds the document S at a conveyance speed v ₂ which is higher than that of the paper feed roller 23. At this time, the paper feed roller 23 is configured to rotate by a one-way clutch, and the paper feed roller 23 is designed to rotate idly even when the back roller 31 feeds the document S at a high transport speed v ₂ .

After the content of the original S is read at the reading position C, the original S having the conveying speed v ₂ at the position of the phase A is read again at the position of the phase B by the back roller 31 at the discharging speed v _2. As it is, it is discharged from the document discharge port 36 to the outside.

As described above, in the document feeder 1, the same feeding speed v ₂ and discharge speed v ₂ are obtained before and after the reading position C by the rotation of the back roller 31, so that at the reading position C, the stable document is stable. S can be read. Further, since the drive mechanism can be configured only by the drive gears 73 and 74 that drive-connect the back roller 31 and the paper feed roller 23, the device can be simplified and downsized.

[0029]

As described above, according to the present invention, at two different phase portions of the back roller, it is possible to obtain the conveying force and the discharging force at the same feed speed according to the number of rotations of the back roller. Therefore, it is possible to separate and feed the document and accurately read the document only by driving the feed roller and the back roller. As a result, the document feeder can be simplified and downsized.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outline of the overall configuration of a document feeder.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a perspective view showing an outline of an overall configuration of a conventional document feeder.

FIG. 4 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

1 Document Feeding Device 2 Paper Feeding Part 3 Reading Part 31 Rear Roller 32 Reading Plate A Phase B Phase S Document v ₂ Transport Speed (Same Feed Speed) v ₂ Discharge Speed (Same Feed Speed)

Claims (1)

[Claims] 1. A paper feed unit for feeding a plurality of originals separately, and the originals are read by passing the originals between a back roller and a reading plate in contact with the back roller. And a reading unit configured as described above, wherein a reading plate is bent and formed so as to come into contact with each other at two different phases of the back roller. An original conveying apparatus characterized in that a conveying force and a discharging force having the same feed speed according to the number of rotations of the original are obtained.