JPS5888767A - Automatic original feeder - Google Patents

Abstract

PURPOSE:To speed up original feed by providing two original feeding mechanisms, and carrying and holding the 2nd original to and at a recording position before the 1st original is discharged. CONSTITUTION:On platen glass 24, two original feeding mechanisms are arranged; and the 1st entire-surface belt 13 is extended among a couple of driving rollers 15 and a turn roller w16, and the 2nd entire-surface belt 14 is provided similaryly. The 1st original i carried to a position A and from counted numbers of a paper detection sensor 4 and a prescribed photointerrupter, that the 2nd original is shorter than the distance l between positions A and C is detected. Then, the 2nd original is received and stopped between points C and D. When copying is started in said state, the 2nd original is conveyed to and held at the position A before an orginal is discharged, and the 1st original is discharged. Therefore, the 2nd original is carried in before the original is discharged, so that original feed is speeded up.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder used in image forming equipment such as a copying machine or an information recording device. The present invention relates to an automatic document feeder used in an image forming apparatus such as a copying machine that automatically feeds and aligns documents onto a platen (hereinafter referred to as a platen) and automatically discharges documents from the same position after copying is completed.

An example of an automatic document feeder used in a copying machine will be described below.

Conventionally, the feed mechanism of this type of device has been configured with a combination of a pair of two rollers and one or more belts stretched across the rollers. from 1
The originals fed in sheet by sheet are conveyed to a predetermined position on the platen, and then exposed and copied, and then conveyed out, and at the same time or at the same time,
Usually, the device is provided so that the next document can be fed in after being ejected.

However, with this format, when the manuscript is relatively small (
For example, an A4 size document for an A3 size platen)
Even though the original to be transported is small, the timing of driving and stopping the feed mechanism for transporting the original is difficult for large originals in the sense that the next original cannot be fed until the previous original is ejected. However, it had the same drawback as being time consuming.

In view of these points, the present invention provides a plurality of pairs of rollers constituting the above-mentioned feeding mechanism and one or more belts along the document conveyance direction, so that the document can be adjusted according to the dimensions of the grating. When the number of originals is relatively small, by feeding two or more originals into the device without leaving any gaps between them, the originals can be transported from the original placing section to the designated position for image copying, and a large number of originals can be This is provided for the purpose of shortening the overall transport time (speeding up copying).

Therefore, the gist of the present invention is to provide an automatic document feeder that transports a document to an image recording position and then discharges it from that position, including a plurality of conveyance means for conveying the document to the image recording position, and a plurality of conveyance means for conveying the document to the image recording position; The automatic document feeder is characterized in that at least one of the means has a function of temporarily stopping the conveyed document before an image recording position and making it standby.

The present invention will be explained below based on the drawings. 1 and 2 show one embodiment of the present invention.

FIG. 1 is a sectional view showing an embodiment of the automatic sheet document feeding device of the present invention, and FIG. 2 is a plan view.

In FIG. 1, reference numeral 1 denotes a tray for stacking sheet originals, and the sheet originals 8 on the entrance tray 1 are stacked with the lower side in the figure facing up (image side).

Further, the pickup roller 3 swings in the direction AB shown in FIG. 1 about an axis 9 having a rubber-based friction coefficient.

A feed roller 5 (made of the same material as the pickup roller 3) is fixed to the feed roller shaft 9, and rotates as the feed roller shaft 9 rotates, and this rotation is controlled by a gear (not shown) to the pickup roller 5. 3, the feed roller 5 and the pickup roller 3 are configured so that the rotation direction is 1-, and the peripheral speed of the rollers is 1-ij1-. The rotary shaft (not shown) of the first paper feed roller 6 is fixed to the paper feed tray 1 , and a sheet document 8 is inserted between the pickup roller 3 and the first paper feed roller 6 . The second feed roller 7 is configured to be driven when the document is conveyed while pressing the document.The second paper feed roller 7 is configured to be slidable so as to have a pressing force toward the thickening roller shaft.
When the sheet document passes between the feed roller 5 and the second feed roller 7, it is configured to be driven. Furthermore, the pickup arm 10 shown in FIG. 2 is similarly provided so as to be able to swing around the big arm shaft 11 shown in the second section 1 as a swing axis, and has a U-shaped groove (not shown) at one end. . It is engaged with a shaft 12b fixed to the paper feed arm 12 shown in FIG. 2, which swings about the feed roller shaft 9 as a swing shaft.

The above constitutes the first stage document feeding mechanism (feeding mechanism) from the document table, and its operation is as follows: When the pickup arm shaft 11 is oscillated and rotated counterclockwise in FIG. The pickup arm 10 similarly swings counterclockwise, and the paper feed arm 12 also swings counterclockwise about the feeding roller shaft 9. At this time, pick up roller 3
is separated from the first paper feed roller 6.

Next, when the pickup arm shaft 11 is rocked clockwise, the pickup arm 10 is rocked clockwise, and the paper feed arm 12 is also rocked clockwise about the feed roller shaft 9. Therefore, the pickup roller 3, which was separated from the first paper feed roller 6, and the first paper feed roller 6
When there is a sheet original 8, the paper can be fed by sandwiching the sheet original and feeding it.

(5) The document presence/absence sensor 2 detects the presence or absence of a sheet document, and in this example, a reflective sensor is used. Further, the leading edge detection sensor 4 detects the leading edge of the sheet document, and is also a reflective sensor. Next, the document feeding mechanism, which is a characteristic structure of this embodiment, will be explained.

As shown in the figure, in this embodiment, structurally independent first and second feeding mechanisms consisting of a pair of rollers and an endless belt stretched between these rollers move the document on the document platen glass 24. Two sets are arranged along the feeding direction. And in each of these sets of feeding mechanisms,
13.14 is an endless belt with a width large enough to cover the entire surface of a sheet document, and its surface is coated with a rubber-based material that has a sufficient coefficient of friction so that the document can be conveyed by frictional force. There is. In addition, for practical purposes, it is preferable to treat the surface with alcohol or the like so that it can be easily removed even if it becomes dirty.

The first set of full-surface belts 13 are connected to a pair of drive rollers 1.
5 and a turn roller 16, and the turn roller 16 has a force (6) applied to its shaft 16a, and when the belt 13 has sufficient tension, the driving roller 15 and the full-surface belt 13 slip. It is configured so that it does not. Also, a second set of full-surface belts 14
Similarly, the turn roller 18 is applied to the drive roller 17 and the turn roller 18, and the turn roller 18 has a force applied to its shaft 18a, and the full-surface belt 14 has sufficient tension, so that the drive roller 17 and the full-surface belt]4 is constructed to prevent slippage.

Further, presser rollers 19 and 20 are provided as pressers for the full-surface belt 13, and rollers 21 and 22 are provided as pressurizers for the full-surface belt 14 on the inner side of the track of each belt. The rollers 19 and 20, the pressure rollers 20 and 21, the pressure rollers 21 and 22, and the space between the pressure roller 22 and the discharge roller 23 are set at a pinch interval that is somewhat narrower than the minimum size of the sheet document that can be transported, and each Roller 19, 20°2
1.22. The entire belt is 13°14 with light pressure, total 9
Press the sheets 13 and 14 onto the platen glass 24.
It is provided to provide a conveying force when passing between. Reference numeral 23 in the figure denotes a discharge roller which, under the pressure of the discharge rollers 65, pinches and discharges the sheet original 1'' which has been copied on the raw material platen glass 24. The discharge roller 65 follows the movement of the C/M document. The documents ejected by the ejection roller 23 are sequentially loaded onto the ejection tray 64. The attachment 25 disposed near the discharge roller 23 is a discharge detection sensor that detects the discharge of a sheet document, and lights up a jam lamp if the document does not pass for a certain period of time during copying operation. In the book 1 and 11, this uses the anti-body type 1 sensor. Note that the ejection roller 65 is actually the paper ejection tray 6.
It is preferable to use a knurling-shaped one in order to make loading the original into 4 easier.

Now, the driving section of this embodiment will be further explained with reference to FIG.

- First, the rotation shaft of the drive motor 26 of the device has a hogear 27.
is fixed so that the drive of the motor is transmitted to the gear 28 via the idler gear 36. Here, the rotation of the gear 28 is transmitted to the clutch shaft 30 by turning on and off the TA clutch 29, and when the electromagnetic clutch 29 is energized, it is turned on (rotation is transmitted). First, the electromagnetic brake 31 is connected to the clutch shaft 30.
This lightning stops the rotation of the magnetic brake 3.
1, the clutch shaft stops rotating 300 times. Further, a gear 32 is fixed to the clutch shaft 30, which transmits 300 rotations of the clutch shaft to a clock disk gear 33, and increases the rotation speed according to the gear ratio to cause the clock disk 34 to rotate completely. This clock disk 34 has fine grooves on its circumference, and is configured to count the number of clocks by reading the number of grooves through which photo-interacitors 35 arranged correspondingly to each other are rotated.

The 300 rotations of the clutch shaft are caused by a drive belt 45 fixed to the clutch shaft 30, a driven belt 46 arranged to be paired with the drive belt 45, and a belt 47 installed between them (9). through the drive roller shaft 4
4. This drive roller shaft 44 constitutes the shaft of the drive roller 17 of the feeding mechanism having the above-mentioned full-surface belt 14.

The above configuration constitutes a mechanism for driving and stopping the second set of feeding mechanisms having the pair of rollers 17, 18 and the full-surface belt 14.

Similarly, the rotation of the gear 28 is further transmitted via the idler gear 36, so that the gear 37 is rotated by the driving force of the drive motor 27.

Here, the rotation of the gear 37 is caused by the on-off of the electromagnetic clutch 39.
The rotation is transmitted to the clutch shaft 38 by f, and when the electromagnetic clutch 39 is energized, it is in an on state (rotation is transmitted).

Further, the electromagnetic brake 40 is for stopping the rotation of the clutch shaft 38, and when the electromagnetic brake 40 is energized, the rotation of the clutch shaft 38 is stopped.

A gear 48 is fixed to the clutch shaft 30, which transmits the rotation of the clutch shaft 38 to a clock disk gear 41, increases the rotation speed according to the gear ratio, and clocks the clock disk 42. Rotate. This clock disk 42 has fine grooves on its circumference, and is configured to count the number of clocks by reading the number of grooves that the photointerrupter 43 passes through as it rotates.

Further, the rotation of the clutch shaft 38 is controlled by a drive pulley 49 fixed to the clutch shaft 38, a driven pulley 51 disposed to form a pair with the drive pulley 49, and a belt 52 installed between them. It is provided so as to be transmitted to the roller shaft 50. This drive roller shaft 50 constitutes the shaft of the drive roller 15 of the feeding mechanism 9 having the full-surface belt 13 described above.

The above configuration constitutes a mechanism for driving and stopping the first set of feeding mechanisms having the pair of rollers 15, 16 and the full-surface belt 13.

Further, the pulley 53 is mounted on the drive roller shaft 50 via a spring clutch (not shown), and the plunger 54
is provided so as to control the spring clutch control ring 61 via the clutch pawl 55 to turn on/off the drive transmission that transmits the rotation of the pulley 53 to the pulley 56 via the belt 57. It is attached via a clutch (not shown).

Regarding the series of transport mechanisms that are provided sequentially along the feeding direction of the sheet original as described above, a slight difference in the feeding speed is set between each transport mechanism to prevent wrinkles etc. from occurring when feeding the sheet original. The ratio of the diameters of the pulleys 53 and 56 is selected so that the circumferential speed of the full-surface belt 13 is slightly faster than the circumferential speed of the feed roller 5.
Pulleys and gears are constructed so that the full-face belt 14 is slightly faster than the full-face belt 13, and the paper discharge roller 23 is slightly faster than the full-face belt 14.

In connection with this configuration, when the sheet original 8 is gripped by the full-surface belt 13 and reaches the same speed as the belt 13, the pulley is moved so that the feed roller 5 can follow the feeding of the sheet original 8. 56 and the feed roller shaft 9 are connected in one way.The feed roller 5 and the pickup roller 3 are geared together so that they have the same rotational direction and the same circumferential speed. Further, the Granger 58 is
The paper feeding roller shaft 60 is swung via a lever 59 to cause the pickup roller 3 to move up and down.

Next, the operation of the automatic document feeder configured as described above will be explained in order. A predetermined sheet original 8 is placed on the entrance tray 1 with the image side facing down, and the sheet original is inserted between the pickup roller 3 and the paper feed roller 6. Then, the document presence sensor 2 detects the sheet document, and after a certain period of time, the plunger 58 is energized, the pickup roller 3 descends, and the document is sandwiched between the pickup roller 3 and the paper feed roller 6 (note that if the sheet is unused) In this state, the pickup roller 3 is lifted upward). In synchronization with this, the motor 27 begins to rotate, and the clutches 29 and 39 are also energized to drive the drive rollers 15 of the first and second sets of feed mechanisms.
．． 17 begins to rotate, but in this state the plunger 54
7t is not energized, and the spring clutch (not shown) K causes the shaft 53 to remain stationary, and the sheet document is not conveyed. Next, after a certain period of time has elapsed since the start of the motor 27, the plunger 54 is energized, the clutch pawl 55 is separated from the control ring 61, and the rotation of the drive roller @ 50 is transmitted to the feed roller shaft 9, causing the feed roller 5 and pickup roller 3 to be rotated. starts rotating. As a result, the sheet original 8 begins to be conveyed, and when the leading edge of the sheet original 8 passes between the feed roller 5 and the feed roller 7 of the drive 2, the leading edge detection sensor 4 detects the leading edge of the sheet original 8. From this time, each of the seven automatic interrazotors 35 and 43 in the drive system of the transport mechanism of the frame 1 and the second set starts counting the number of clocks.

The sheet original 8 is further fed and enters between the entire surface belt 13 and the original platen glass 24, and its leading edge hits the presser roller 1.
9, the conveying force of the full-surface belt 13 increases due to this pressing force, and the sheet Ifj[8 becomes at the same speed as the circumferential speed of the full-surface belt 13, which is faster than the circumferential speed of the feed roller 5. At this time, as described above, the feed roller 5 rotates according to the feed speed of the sheet document 8 (14). Furthermore, the sheet original 8 is placed on the turn roller 1
9 and the position C directly below the drive roller 17, the entire belt 14 and the original grating glass 24
It gets stuck in between and continues to be transported. Further, when the trailing edge of the sheet document 8 is detected by the paper presence/absence sensor 2, the power to the planter 58 is cut off, and the pickup roller 3 moves upward.

Further, when the trailing edge of the sheet original 8 is detected by the leading edge detection sensor 4, the current to the silanger 54 is cut off, and the rotation of the feeding roller 5 and the pickup roller 3 is stopped. This is because the next sheet document will not be accepted.

Now, the motor 27 is de-energized when the photo-interacitor 35.43 counts a certain number of clocks after the leading edge of the paper is detected by the leading edge detection sensor 12, and at the same time, the clutch 29.39 is de-energized. At the same time, the brake 31
．． 40, the clutches 111130 and 48 stop instantly. As a result, the rotation of the drive roller shafts 44, 50,
Furthermore, the movement of the entire belt 13 and 14 stops instantly,
The document stops at the position where the leading edge of the document is at position A. Immediately, a copy start signal is sent to the copying machine main body, the original exposure run f 62 a and the reflective shade 62 are scanned in the B direction, and copying is started.

The timing relationship between the activation and stopping of each of the drive mechanisms described above is controlled by a control circuit (not shown) based on signals from each sensor (sensor 12, etc.) and photointerrupter, including in the case of rapid feeding of originals, which will be described later. It is designed to do this.

The feature of this actual example is that the feed mechanism 9 consists of two independent sets, so that when the length of the sheet document 8 is shorter than the distance t from position A to position C, it is detected by the leading edge detection sensor 4. Specifically, after the leading edge detection sensor 4 detects the leading edge of the sheet original 8, the photointeracitor 35.4
When the number of flocs in 3 is below a certain value and the trailing edge is detected,
The main feature is that the full-surface belts 13 and 14 are configured to receive the next draft even while rotating or copying.

The movements will be explained in order below.

When the leading edge detection sensor 4 detects that the length of the first document 8 is shorter than t shown in FIG. The feed roller 5 is stopped by cutting off the power to the granger 54, but in this case, immediately after that, the paper presence/absence detection sensor 2 immediately checks the presence or absence of the second sheet original 8, and the paper feed roller 5 is stopped. When there is a document, the granger 58 is energized after a certain period of time, the pickup roller 3 descends, and the document is sandwiched between the pickup roller 3 and paper feed roller 6. At this time, the motor 27
is rotating, the if silencer 54 is immediately energized to rotate the feed roller, and the subsequent second sheet document 8 begins to be conveyed. When this second sheet original 8 is detected by the leading edge detection sensor 4, the photo interrupter 4 of the second sheet feeding mechanism set is activated.
3 starts counting the number of clocks, and the second sheet original is conveyed between the full-surface belt (17) 13 and the original platen glass 24 in the same way as the first original.

When the leading edge of the sheet original reaches the position before the copying of the first original is finished, the electromagnetic clutch 59 is de-energized, and at the same time, the electromagnetic brake 40 is energized to stop the drive roller shaft 14. At the same time, the conveyance of the second document 8 between the entire surface belt 13 and the grating glass 24 is stopped. Thereafter, when the first copy is completed and the motor 27 is rotating, the clutch 27 is energized and the full-surface belt 14 begins to eject the first document 8. At the same time, the electromagnetic clutch 39 is also energized. The drive shaft 50 rotates, and the second document 8 passes between positions C and 0. At the same time, the leading edge of the second document 8 is detected by the paper passing detection sensor 66. After that, the photo interrupter 35 performs a clock count and displays a predetermined image. It stops at the forming position (when the leading edge of the original 8' reaches position A) and copying starts. On the other hand, the first document 8 is held between the ejection roller 23 and the ejection roller 65 and is transferred to the ejection tray 27.
is discharged to the top.

It goes without saying that when the length of the second and subsequent documents is less than or equal to t (18), the third and subsequent documents are similarly fed and conveyed.

In addition, when the length of the first document 8 is 4 or more, after the discharge detection sensor registers the discharge of the document 8, the paper presence/absence detection sensor 2 detects the presence or absence of the document, and then the next document is printed. A feeding operation will be performed.

However, the length t in this embodiment only needs to be less than or equal to the distance from position A to position C, and need not be limited to the distance from position A to position C, of course.

Furthermore, this series of operations is explained in flowcharts 6 to 1.
This will be explained using Figure 1. "Automatic document feeder 9 device stopped" in Figure 6 (■) means that the weight-up of the copying machine body has been completed and copying is possible, the pickup roller 3 is lifted in direction A, and the document is not in the automatic document feeder. There is no, 1
The recipient of the first sheet of manuscript is waiting to be received. At this time, when "'sheet feeding" (2) is performed, it is detected by the document presence/absence sensor 2 (2), and the silan gloss 58 is turned on, so that the pickup roller 3 is brought down (2). Next KX,
When the IK motor 26 and the clutch 29.39 are turned on, the full-surface bell) 13.14 starts to rotate. When the l run gear 54 is turned on, the feed roller 5 rotates and the pasting of the original begins. ■. Here, when the leading edge detection sensor 4 detects the leading edge of the document, at the same time, the clock count of the groove of the clock disk 34, 42 is started by the 7-bit interrazota 35 and/or 43, and this clock count and the document detected by the leading edge detection sensor 4 Detect the length of the document by counting until the trailing edge is detected or by not detecting the trailing edge of the document until a certain count 1~ If it is rectangular than the AC interval of the full-surface belt 14, the Y direction of 6th C 10 , when the length is longer, the flowchart proceeds in the N direction ■0 Hereinafter, when the length is shorter than 1, a case will be described in which the 22nd original document is waited under the full-surface belt 0. In this case, when the leading edge detection sensor 4 detects the trailing edge of IG, 1itA, the plunger 54 is immediately turned off to prevent the document from being fed to the next automatic document feeder), ■, ■, ■ ,■. Here, the document passes between positions ■ and ■, and when the leading edge of the document reaches position A below the full-surface belt 14 according to the count described above, the clutch [phase] is turned off.
f, the electromagnetic brake 31 is turned on, and the C ψ document stops at the image forming position of the copying machine main body. Also, at this time, the count is counted when the leading edge of the document is positioned by the continuous feeding confirmation sensor 66, and the document is stopped between C and C. This may be performed by the photointeracitor 35 (not shown) from when the passage is detected.

After the document is stopped at the image forming position, exposure of the document is started, and the 7° ranger 58 is turned off. Note that the order of [phase] and ■ may be reversed. Here, when the second document is fed [phase], it is detected by the document presence sensor 2 in the same way as the first document, and then ■ Silangers 54 and 58 are turned on.
1. The second document is fed into the automatic document feeder. After the leading edge is detected by the leading edge detection sensor 4, a clock count is started by the photointeracitor 43.

Here, if the copy word light of the previous manuscript is not finished,
The flowchart advances in the N direction of FIG. 9 (■). So(2
1) After a certain clock count, the clutch 39 is turned off.
When the f + electromagnetic brake 40 is turned on, the second document waits under the full-surface belt 13 until the copy exposure of the previous document is completed. ], clutch 39 is on, electromagnetic brake 4
0 is turned off, the conveyance of the second document is restarted (2), and when the clutch 29 is turned on and the electromagnetic brake 31 is turned off, the discharge of the previous document is also started (2).

Then, when the leading edge of the second document is detected by the paper passage confirmation sensor, the photointeracitor 35 counts the clock [phase], and the second document is stretched to the image forming position. Use it as a sign to stop.

As with the previous document, when the trailing edge of the second document is detected, the blank layer 5 is pressed to prevent the next document from being accepted.
4 turns off, the rotation of the feed 4-25 stops. ■ [Phase], 0 @ ■ @ [Phase], ■, 0° If the second document is shorter than the AC interval, the rotation of the feed 4-25 will stop. After confirming that the paper has been ejected, the photo interleave (22) described above is performed. When the leading edge of the document reaches position A, as with the previous document, by counting a certain number of clocks of the datater 35, the clutch 29 is turned off and the electromagnetic brake 31 is turned on. As a result, the rotation of the full-surface belt 14 is stopped, the second original is stopped at the image forming position, and the exposure of the original is started. After confirming that the paper has been ejected, when the tip of the paper reaches the position indicated by a certain clock count of the photo interrupter 35, the drive motor 26 and the clutch 29. )13.
14 stop, and the second document stops at the image forming position (■).

After the exposure of the original is completed, the silanger 58 is turned off.
By ff, Birafatsujirola is uploaded,
Further, the drive motor 26. The second document is ejected by turning on the clutch 29.39 and turning off the electromagnetic brake 29.39.

Note that if the paper is fed before the ejection of the second original is completed, the original is transported through the feeding device as shown in this flowchart.

If the first document is shorter than the AC interval and there are no 19 documents after the second, after the document exposure is completed, the clutch 29 is turned on.
After the document is ejected by turning off the electromagnetic brake 31, the ejection of the document is confirmed, and the drive motor 26 is turned off.
f, the clutches 29 and 39 are turned off, ■, the automatic document feeder stops, and ■ returns to the original A state.

Also, when the first original is long, the trailing edge of the original is detected through the flowchart ① to [phase], and the silanger 54 is turned off, in the same way as when the first original is short.

When the feed sheet roller 5 stops rotating and the leading edge of the document 1 reaches position A, the drive motor 26 is turned off and the clutch 2 is turned off.
9.39 is off, electromagnetic-1”v-$31, 40 is o
By pressing n, both of 13 and 14 will stop, the original will stop at the image forming position, and after the exposure of the original is completed,
Plant gear 58 is off, piffer roller is up, drive motor 26 is on, % clutch 29.3
When 9 is turned on and the electromagnetic brakes 31 and 40 are turned off, the original is ejected, and 01 is ready to receive the next original.

After the document presence sensor 2 detects the leading edge of the document, after a certain period of time or a certain clock count, the leading edge detection sensor 4 detects the leading edge and/or rear edge of the document, the paper feed confirmation sensor 66 detects the leading edge of the document, and the discharge confirmation sensor detects the leading edge of the document and 10r. If the trailing edge is not detected, a sequence is added to stop the drive motor 26 by emitting a signal such as "paper binding" and to manually feed the document out of the automatic document feeder to prevent damage to the document. (not shown).

In the first embodiment described above, two sets of full-surface belts 13.1
However, as shown in the second embodiment shown in FIG. 3, the second set of full-surface belts 14' on the discharge side is replaced by the first set of full-face belts 13' on the feed side. It may be made much shorter, and in this case there is an advantage that when the length of the document is short, the document can be fed faster than in the first embodiment.

Further, as shown in the third embodiment of FIG. 4, a plurality of sets of feeding mechanisms including full-surface belts may be provided. Set the stop position to the full-face bell located on the document exit side (left side of the figure) l4//I, or the lower side of the central full-face heald 13" (between the f Latin glass), and then The waiting position for the original can be set at the full-surface belt 13# located on the original carry-in side (right side in the figure), or under the central full-surface belt 13 (between f Latin glass) depending on the case. This is suitable when the original size is small.

Although the above embodiments have all been described as using full-surface belts, this means that a plurality of narrow belts 13a-h, '14a-h may be used as shown in FIG. Of course. In any case, tl shown as the length of the belt on the unloading side is the optical ramp'
Practically speaking, it is desirable that the distance be equal to or longer than the shortest scan of 62a. Further, as shown in FIG. 12, the belt 13.
If a light beam 67 is arranged between the belts 14 so as to fill the gap between both belts, and is turned on during copy filtering, the source of the original exposure lens 2a will leak from the gap between both belts ( 26) It is also possible to prevent fogging of copies.

Further, although the above embodiment has been described as being applied to a copying machine, it is clear that the present invention can also be applied as an automatic document feeder used in other image forming equipment. .

As described above, the present invention includes a structure in which a plurality of sets of zero-feed structure including each structurally independent pair of rollers and a belt stretched thereon are arranged in a four-dimensional manner in one pile along the conveying direction. This is an automatic document feeder with 9 features, and compared to conventional devices equipped with only one set of the feed V mechanism, the image recording of the first document is completed and the document is fed before it is ejected. The belt on the side allows the second document to be placed on standby without leaving much of a gap, and as a result, the speed of document feeding can be increased, which is extremely useful.

[Brief explanation of the drawing]

The drawings all show an embodiment of the NL disaster automatic feeding device according to the present invention, and FIG. 1 is a longitudinal sectional view of the device of the first embodiment, FIG. 2 is a plan view of the same, and FIG. Figure 4 is also the third
FIG. 12 is a sectional view showing a modified aspect of the document feeder. 1: Entrance tray 2: Document presence sensor 3: Pick-up roller 4: Leading edge detection sensor 5: Feed roller 6: Paper feed roller
Big arm shaft 12: Paper feed arm 12 b: @1i13, 1
4: Full-face belt 13', 14': Full-face belt 1 a//, 13///, 141: Full-face belt 13a-h, 14a-h: Narrow belt 15.17: Drive roller 16.18: Turn roller 19 .20: Presser roller 21.22: Presser roller 23: Discharging roller 24: Original platen is at lath 25
: Discharge detection sensor 26: Drive motor 27: Drive gear 28: Gear 29: Electromagnetic clutch 30: Clutch shaft 31: Electromagnetic button 1/- key 32: Gear 3
3: Clock disc gear 34: Clock disc 35 Nifoto interrazota 36. 36': Idler gear 37: Drive gear 38: Clutch shaft 39: 11! Magnetic clutch 40: Electromagnetic brake 41: Clock disc gear 42: Clock disc 43: Photo interplane 44:
Drive roller shaft 45: Drive pulley 46: Follow pulley
47: Belt 48: Gear 49: Drive pulley 50: Drive roller shaft 51: Driven pulley 52: Belt 53: Pulley (29) 54 Nib run gear 55: Clutch pawl 56: Pulley
57: Belt 58 Nibrangier 59 Nippa 60: Paper feed roller shaft 61: Spring clutch control ring 62: Reflector shade 62a: Original cover 3:
Case 64: Paper ejection tray 65: Ejection roller
66: Paper feeding confirmation sensor 67: Light source (30)

Claims (1)

[Scope of Claims] An automatic document feeder that transports a document to an image recording position and then discharges the document from that position, comprising: a plurality of conveyance means for conveying the document to the image recording position; and at least one of the conveyance means. An automatic document feeder is characterized in that it has a function of temporarily stopping a conveyed document before an image recording position and making it standby.