JPH05139573A - Automatic document feed device - Google Patents

Abstract

PURPOSE:To eliminate the gap between two documents during positioning operation of an automatic document feed device in which two documents are copied onto a single image-transfer sheet by a single action, and to obtain a clear copy onto which no image of dirt is transferred from a conveyer belt on the rear side of the scripts. CONSTITUTION:In a two-in-one copy mode, documents 15 are set on a script setting bed, and after the lowermost document 15A is separated away through the motion of a separating and feeding mechanism, when the trailing edge 15b of the first document 15A is detected by a sensor 28, the second document 15B is then separated and fed in a similar manner. When the leading edge 15a of the document 15B is detected, the document 15B is transferred to a distance L1 from the sensor 28 by a feed motor and is stopped so that the leading edge 15a of the document 15B is projected from the positioning end 18a of a scale 18 by a distance L2 (0 to 3mm). Then, the motor 23 is reversed so as to allow the trailing edge 15b of the document to abut against the scale positioning end 18a, and thereafter, it is transferred onto a contact glass pane 13 so as to carry out copying operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document feeding control of an automatic document feeding device, for example, an image forming apparatus such as a copying machine or an image reading device, and more particularly to feeding two documents onto a contact glass. The present invention relates to an automatic document feeder to be arranged.

[0002]

2. Description of the Related Art As a conventional automatic document feeder, for example, there is one shown in FIG. 4 disclosed in Japanese Unexamined Patent Publication No. 2-225241. The automatic document feeder 1 sends a first document 5 fed by a pickup roller 2, a separation roller 3, and a separation pad 4 to a platen glass 7 side by a timing roller 6, and a rear end of the document scale. It stops before passing 8 and the conveyance belt 9 is rotated in the reverse direction to bring the rear end into contact with the timing roller pair 6 for positioning.
Next, the second original is fed and sent to the timing roller pair 6 for alignment, and both originals are sent to the platen glass 7 by forward rotation of the timing roller pair 6 and the conveyance belt 9.
When the trailing edge of the second document overruns the positioning surface of the document scale 8 by a distance X _0, it stops, and then the distance X ₀
In addition, the original is fed back by a distance larger than the gap generated between the front and rear originals so that the rear end of the second sheet is brought into contact with the positioning surface.

Further, as a conventional automatic document feeder,
There is one such as that described in JP-A-63-273853. This is because two originals are placed side by side on the platen glass 7, and when the exposed original is ejected from the platen glass 7, a space between the first original and the second original is opened. Two methods have been proposed. One is a method of temporarily stopping the following document and leaving a space from the preceding document. The other is to increase the rotation speed of the downstream-side transport roller.

[0004]

However, in the conventional automatic document feeder shown in FIG. 4, such a conventional automatic document feeder has a conveyor belt 9 for arranging two originals 5 side by side on a platen glass 7. Since they are reversed twice, it takes time to dispose the two originals 5 on the platen glass 7 and there is a problem that productivity is lowered.

In addition, in the above-mentioned conventional automatic document feeder which leaves a space between two documents, it takes time to temporarily stop the following document, which reduces the productivity of copying. There is a problem. Further, if the rotation speed of the downstream conveyance roller is increased, the downstream side becomes relatively high speed conveyance and is discharged at a high speed.Thus, if the document is discharged to the inclined discharge section, the documents after discharge are easy to align, When the sheet is discharged flat, the discharging speed of the discharged original is too fast, and the discharged original is fluttered and disjointed, which is not suitable for flat discharging like an automatic original feeder.

The present invention has been made against the background of such a conventional problem. The invention according to claim 1 completely eliminates the gap between the originals during the positioning operation of the two originals by the scale. By the control means for carrying control so as to eliminate, it is possible to obtain a clean copy in which the dirt of the carrying belt on the back side of the original is not shown, and two originals are automatically transferred to one transfer sheet by one transfer operation. By copying manually, it is possible to save space, save resources, and speed up the productivity of copying. Further, the invention according to claim 2 discharges two originals at the same time as the discharging operation. Separate the overlap,
(EN) Provided is an automatic document feeder which shortens the paper discharge operation by opening a space, does not disturb the page order even in a flat paper discharge section, and has a good stackability. With the goal.

[0007]

According to the present invention, two originals are fed one by one from an original placing table and positioned on a contact glass by a scale provided on an end of the contact glass. Transport and 2 on contact glass
In an automatic document feeder that exposes two originals together and ejects them from the ejection side, after feeding the first original, the second original is fed at an interval, and The leading edge of the second original is projected from the leading edge of the scale to the downstream side in the transport direction and stopped, and the preceding first original is fed back and brought into contact with the leading edge of the scale, And a control means for controlling the conveyance means, the conveyance means overlapping the protrusions of the originals and conveying them again to arrange the two originals overlapped at a predetermined position on the contact glass. It is what

According to a second aspect of the present invention, in addition to the structure of the first aspect, the upper and lower parts are provided in the vicinity of the most downstream discharge port for conveying the two overlapping originals, and the upper side is driven. An upper discharge roller, a lower discharge roller that comes into pressure contact with the upper discharge roller, and an elastic roller fixed on the axis of the upper discharge roller and having a diameter larger than that of the upper discharge roller. It is characterized in that it is provided with a paper means, and holds the second original document to follow by the upper and lower paper ejection rollers and separates the preceding first original document by the diameter difference of the elastic rollers.

[0009]

According to the first aspect of the present invention, since the conveying means controlled by the control means is provided, the conveying means feeds two originals at a distance and feeds the second original that follows. Stops when the tip of the paper sticks out from the tip of the scale, and feeds the preceding original in reverse, abuts the scale, overlaps the original to be sent later, conveys again, and overlaps at a predetermined position on the contact glass 7. Then, place two originals.

According to the second aspect of the present invention, by driving the upper paper discharge roller, the lower paper discharge roller and the elastic roller in the vicinity of the paper discharge port of the original, the two originals are discharged on the upper side. Driven by a roller, the elastic roller with a large diameter is compressed to the diameter of the paper ejection roller and is conveyed between the upper and lower paper ejection rollers.
When the trailing document is held by the upper and lower paper ejection rollers, the trailing edge of the preceding document passes between the paper ejection rollers, and if the paper ejection rollers are not held, the compressed elastic roller restores its original diameter. As a result, the trailing edge of the preceding document is pushed to the downstream side.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing an embodiment of the present invention described in claims 1 and 2. First, the configuration will be described. In FIG. 1, reference numeral 11 denotes an automatic document feeder, which is provided so as to cover a contact glass 13 on an upper portion of the copying machine 12 and has a copy surface on an original placing table 14 on an upper side. The originals 15 placed toward the sheet are called from the lowermost original 15 on the original placing table 14 and separated into sheets one by one, and the sheets are inverted and fed. The original 15 fed above is positioned by a scale 18 which is a positioning reference provided on the end portion of the contact glass 13, and a conveying unit 20 having a conveyor belt 19 for conveying the exposed original 15 to the discharge side. A paper discharge unit 22 that reverses the document 15 conveyed from the conveyance unit 20 and discharges it through the paper discharge port 21 onto the substantially horizontal and flat upper cover 11A of the automatic document feeder 11. A conveyance loop as shown in FIG. 1C is formed from the feeding of the original document 15 to the discharging of the original document 15, and the automatic document feeding device 11 is formed compact as a whole.

The automatic document feeder 11 is provided in the paper feed section 17, and drives the paper feed section 17 by means of a carrying motor and a gear train (not shown) which is a carrying means, and is also connected to the gear train. The transport section 19 is driven by the transport belt 19 and the sheet discharge section 22 is driven by a sheet discharge motor and a gear train (not shown) which is a sheet discharge unit and is provided in the sheet discharge section 22. ing. The conveyance motor is connected to various sensors, for example, a document detection sensor 28 described later, and is controlled by a control unit, which is a control unit (not shown), and can be rotated in the forward and reverse directions. Only the conveyor belt 19 is reversely driven.

As shown in FIG. 1 (b), the paper feed unit 17 has a calling roller 24 for calling the original 15, a calling lever 25 for pressing the calling roller 24, and a separation for separating the called original 15 into one sheet. From the rotation time of the belt 26 and the separation roller 27, the original detection sensor 28 that detects the front end 15a and the rear end 15b of the separated original 15 and generates a detection signal, and the rotation time of the driven roller that is connected to the separation roller 27. A pulse generator 29 for detecting the transport distance of the document 15 and the length of the document 15,
A guide plate 30 that guides the document 15 to the transport unit 20 side is provided. The conveyor belt 19 of the conveyor unit 20 is supported by a drive roller 31 and a driven roller 32, and is driven by a conveyor motor.
The conveyor belt 19 is pressed toward the contact glass 13 by the fixed roller 33 and the pressing roller 34, and the conveyor belt 19 is scaled.
When the document 15 is pressed against the contact glass 18 and the document 15 on the contact glass 13 is fed back to contact the scale 18, the document 15 is prevented from passing over the scale 18.

Next, the two originals 15 are attached to the contact glass 13
In addition to the above, when a copy is automatically made on one sheet of transfer paper in one exposure and copying operation, that is, in the so-called "2-in-1 copy mode", the control unit and the feed motor feed the original 12 and The controlled conveyance operation to the predetermined position on the contact glass 13 will be described with reference to FIG. Manuscript
When 15 is set on the document placing table 14 and the start key of the copying machine 12 is pressed, the calling roller 24, the separation roller 27 and the driving roller 31 start rotating, and the calling lever 25 rotates the document 15 The lowermost original 15 is sent out by pushing it against the sheet, the lowermost original 15A is separated and fed by the separating belt 26 and the separating roller 27, and is conveyed to the contact glass 13 side by the conveying belt 19. . When the document detection sensor 28 detects the trailing edge 15b of the first original 15A, the second original 15B is separated and fed in the same manner as described above with a gap from the original placing table 14. When the document detection sensor 28 detects the leading edge 15a of the second document 15B, the transport motor 23 causes the leading edge 15a to move as shown in FIG.
The original 15 is conveyed by the distance L ₁ from the original detection sensor 28 until it is projected to the downstream side in the conveyance direction of the original 15 by a distance L _{3 of} about 0 to ₃ mm from the positioning end 18a which is the tip of the scale 18, and then stopped.

Next, the transport motor 23 is rotated in the reverse direction, and continues to be rotated in the reverse direction until the rear end 15b of the first original 15A comes into contact with the positioning end 18a of the scale 18 and stops. At this time, 2
The first document sheet 15B is stopped. Therefore, the trailing edge 15b of the first original 15A and the leading edge 15a of the second original 15B overlap by about a distance L ₃ as shown in FIG. 2B. This overlap amount is 0 to 3 mm, and since this width is a non-image area in the normal document 15, it is an amount that can be safely used for copying.

Then, the transport motor 23 is again rotated in the normal direction, and the two originals 15A and 15B, which are the first original 15A and the second original 15B, are overlapped as shown in FIG. 2C. Then, it is conveyed onto the contact glass 13 and placed at a predetermined position and stopped. First original 15A and second original
The clearance L ₄ between 15B and the positioning end 18a of the scale 18 is 0.
~ 3 mm. Then, the two originals 15 are exposed and transferred onto one transfer sheet (not shown) in the copying machine.
The gap L ₄ is so-called blank or specially treated so as not to be transferred to the transfer paper. The two exposed originals 15 are conveyed to the paper output unit 22 while overlapping.

A discharge roller 40, which is a sheet feeding means shown in FIG. 3, is provided in the vicinity of the discharge port 21 on the most downstream side for conveying the two overlapping originals 15. The paper output roller 40 has a paper exit 21
Is provided above and below and is axially separated from each other on a drive shaft 41 driven by a paper discharge motor, and is made of rubber.
A plurality of upper paper ejection rollers 42 fixed to 41 and an upper paper ejection roller 42
Respectively lower sheet discharge roller 43 in contact with pressurized圧当to 42, disposed between the plurality of upper feed roller 42 on the drive shaft 41 made of an elastic sponge member, the diameter D ₄₂ is greater than the diameter D of the upper feed roller 42 Sponge roller 44 which is an elastic roller having ₄₄ .

Next, the operation will be described. In the present invention, since the feeding motor controlled by the control unit and the paper feeding unit and the feeding unit driven by the gear train are provided,
When the start key of the copying machine 12 is pressed during copying in the so-called "2-in-1 copy mode", the conveyance motor drives the paper feed unit 17 and the paper discharge unit 22, and the first original 15A
After the sheet is fed, the gap L ₂ is opened and the second original 15B is fed. When the second original 15B is conveyed until the leading end 15a of the second original 15B protrudes from the positioning end 18a of the scale 18 by the distance L ₃ , the conveyance is stopped and the conveyance motor 23
And the trailing edge 15b of the first document 15A is positioned at the positioning edge 18a.
The paper is sent back until it comes into full contact with. Then, the trailing edge 15b of the first original 15A and the leading edge 15a of the second original 15B overlap. After this overlap, the transport motor 23 rotates in the forward direction, and the two overlapping originals 15 are placed at a predetermined position on the contact glass 13 and stopped. Therefore, the document 15 is exposed and transferred to the transfer paper in the copying machine 12 in a state where there is no gap between the first document 15A and the second document 15B.

Therefore, the conveyance belt 19 on the back surface of the original 15
A clean copy is transferred to the transfer paper because the stains on the paper do not appear. Also, the two originals 15 are reduced to 1 or 1
Since it is possible to make a single copy on one sheet of transfer paper, the copy space can be made small, and the power consumption is low, the energy can be saved, and the resource can be saved on a single sheet. Furthermore, compared to the combination mode, the time can be shortened, the operability is greatly improved, and the copy productivity is significantly improved.

Also, two overlapping originals 15
Is ejected from the ejection section 22 onto the upper cover 11A at the time of ejection, but since the automatic document feeder 11 of the present invention is provided with the ejection roller 40 near the ejection port 21, The two stacked originals 15 are compressed by the driven upper paper ejection roller 42 to compress the sponge roller 44 having a large diameter D ₄₄ to the diameter D ₄₂ of the upper paper ejection roller 42 and the upper paper ejection roller 42 and the lower side. The second document is conveyed between it and the paper ejection roller 43, and as shown in FIG.
The front end portion of 15B is held by the upper paper ejection roller 42 and the lower paper ejection roller 43, and the rear end 15b of the first original 15A leaves the upper paper ejection roller 42 and the lower paper ejection roller 43 and is compressed at the same time. As the sponge roller 44 is restored, the first sheet discharge roller 15A is pushed out and separated from the second sheet discharge roller 15B, and a space is provided. Therefore, the first original 15A is discharged onto the upper cover 11A prior to the second original 15B, and then the second original 15B is discharged onto the first original 15A. It Therefore, the page order of the document 15 can be prevented from being out of order.

The first original 15A is the second original 15
Since the separating operation for separating from B is performed at the same time when the sheet passing through the paper discharge roller 40, there is no change in the speed of the conventional conveyor belt, and the operation can be performed very easily. Furthermore, the first original 15A is
A substantially flat sheet discharge section can be used without particularly increasing the conveying speed, and the stackability of the originals 15 can be improved.

[0022]

As described above, according to the first aspect of the invention, when the two originals are positioned by the scale, the control means for conveying the originals to completely eliminate the gap between the originals is used. It is possible to obtain a clean copy without stains on the back side of the conveyor belt and to automatically copy two originals onto one transfer paper in one transfer operation. Resources can be saved and copy productivity can be increased.

Further, according to the second aspect of the invention, at the time of paper ejection, the overlap of two originals is separated at the same time as the paper ejection operation,
By making the gaps, it is possible to shorten the paper discharge operation, obtain a paper discharge property with good stackability without causing a deviation in page order even with a flat paper discharge unit.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an automatic document feeder according to claims 1 and 2 of the present invention, in which FIG.
(B) is an enlarged front view of a main part thereof, and (c) is a schematic front view showing a conveyance loop of the document.

2A and 2B are diagrams showing a conveyance state of two originals conveyed by the automatic document feeder shown in FIG. 1, and FIG. 2A is a front view showing a state of a leading edge of the second original, and FIG. ) Is a front view showing the overlapping state of two originals after the reverse feeding,
(C) is a front view showing a state of two originals on the contact glass.

3A and 3B are diagrams showing a paper discharge roller of the automatic document feeder shown in FIG. 1, in which FIG. 3A is a front view thereof, and FIG. 3B is a side view showing its action.

FIG. 4 is a partial front view showing a conventional automatic document feeder.

[Explanation of symbols]

 11 Automatic Document Feeder 12 Copier 13 Contact Glass 15 Document 15A First Document 15B Second Document 18 Scale 19 Conveyor Belt (Conveyor) 21 Ejection Port 40 Ejection Roller (Ejection Means) 42 Upper Side Paper ejection roller (paper ejection means) 43 Lower paper ejection roller (paper ejection means) 44 Sponge roller (elastic roller), (paper ejection means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03G 15/04 119

Claims (2)

[Claims] Claims: 1. Two originals are fed one by one from an original placing table, positioned by a scale provided on the edge of the contact glass and conveyed onto the contact glass, and the two originals are put together on the contact glass. In the automatic document feeder that exposes the sheet to the sheet and discharges it from the sheet discharge side, after feeding the first sheet of the original document, the second original document is fed at an interval and the second original document is fed. The front end of the scale is projected downstream from the front end of the scale and stopped, and the preceding first original is fed back to contact the front of the scale and only the protrusion of the second original. An automatic document feeder, comprising: a conveying unit that overlaps and conveys again, and arranges two overlapping documents at a predetermined position on the contact glass; and a control unit that controls the conveying unit. apparatus. 2. An upper discharge roller which is provided above and below a downstreammost discharge port for conveying the two overlapping originals and which is driven on the upper side and presses against the upper discharge roller. The lower paper ejection roller in contact with the upper paper ejection roller and an elastic roller fixed on the shaft of the upper paper ejection roller and having a diameter larger than that of the upper paper ejection roller are provided. 2. The automatic document feeder according to claim 1, wherein the first original document is held by a paper ejection roller and separated by a difference in diameter of elastic rollers.