JPS6123039A - Original conveyor device - Google Patents

Abstract

PURPOSE:To make it possible to take out an original which jams in a conveying path without being harmed, by appropriately performing the releasing operation of sheet paths and by associating the pressure releasing operation of a separating and supplying section therewith. CONSTITUTION:An opening and closing cover section 300 is turned in the direction I to be opened so that a part 13 of a second path 11 in the paper discharge direction and their sheet paths 13, 13b are released, and therefore an original jamming therein may be removed. Further, when a C-guide section 400 is turned in the direction II to be opened, a fourth sheet path 16 and a first sheet path 8 are released so that an original jamming therein may be removed. Even if an original positioned in the second sheet path 11 is held in one part thereof between a belt 27 and a platen 10, and the original may be easily removed by rotating the platen in the direction II in which the original paper may be pulled out form the gap between the belt 27 and the platen 10. Further, since the above-mentioned releasing operation may be carried out being associated with the pressure releasing operation of a separating and supplying sections, originals which dwell in the separating and supplying sections may be easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Scope of Industrial Application] The present invention relates to a document conveying device that feeds a document set on a stacking section to a predetermined processing section.

[Conventional technology and problems]

A typical example of this type of apparatus is a circulating automatic document feeder installed in an image forming apparatus such as a copying machine.

This separates the originals stacked and set on the original placing table as a sheet holding part, and transports them to the platen glass of the original illumination part of the image forming apparatus such as a copying machine, which is a predetermined sheet processing part. After the exposure, the original is returned to the original platen and the cycle of feeding the original from the original platen to the platen glass is repeated.
II is executed sequentially, and if the stacked set of originals is circulated once, one copy of all the stacked originals will be produced, and if the stacked set of originals is circulated and fed repeatedly a predetermined number of times, the required number of copies will be produced. You can get things. Therefore, it is extremely effective for automatically and quickly copying a large number of sheet originals.

However, with conventional devices that have this kind of functionality, it is very difficult to quickly pass documents in both forward and reverse directions, and when handling documents, there is a risk of jamming or damage to the documents. There was a problem in that high precision was required to prevent this.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a document conveying device that eliminates the problems of the conventional devices described above and does not cause jamming or damage to documents.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 to 10 show an embodiment of the present invention.

FIG. 1 is an external perspective view of an automatic document feeder to which an embodiment of the present invention is applied, FIG. 2 is a sectional view thereof, FIG. 3 is an illustration of a movable deflection plate, FIG. FIG. 5 is an explanatory diagram of the drive of the separating section, FIG. 6 is a top view of the main driving section, FIG. 7 is a front view of the main driving section, and FIGS. 8 to 10 are explanatory diagrams of the operation.

In FIG. 2, l is a stacking tray on which documents are stacked and set. This tray supports the original and is arranged so as to be tilted downward toward the original feeding direction so that the original feeding side is lower. As a result, the fed documents are stacked in a uniform manner in the sending direction. Reference numeral 2 denotes a half-moon roller, which sends the original to the downstream separating section, and is controlled so that when there is no original on the stacking table, the roller stops with the notch facing upward. Further, reference numerals 4 and 4a denote feeding rollers that rotate the feeding belt 5 in the direction of arrow A to feed the document on the tray 1.

Furthermore, 6 and 6a are separation rollers, and the separation belt 7 is moved by arrow B.
By rotating it in the direction, the lowest original among the originals stacked on the tray l is separated from the feeding belt 5 one by one. The lump feeding belt 5 and the separation belt 7 constitute a separation supply section S.

The first sheet path 8 is formed between the guides 9 and 9a, and is a path for moving the documents separated one by one by the separation and supply section S onto the platen glass IO. The sheet path 8 is provided in an arch shape between the separation supply unit S and the end 10a of the platen glass 10, and reverses the document sent out by the feeding belt 5 and guides it onto the platen glass 9. .

The second seat path it has arch-shaped guides 12 and 12
It is formed between 12 and 12b, and is a passage for inverting the original on the platen glass IO and guiding it to the stacking tray. Here, the second sheet path 11 is provided opposite to the first sheet path 8, and extends from the end 10a of the platen glass 10 through the outside of the sheet path 8 to above the separation belt 7.

The third sheet path 13 is a path branched from the second sheet path in the switchback direction, and is a path for reversing a double-sided document, and is formed by a guide 14 and a guide 14a, and a guide 14 and a guide 14b. The latter half path 35 is formed by the guide 15 and the guide 15a, and is designed to invert the document upward and expose a portion of the document to the outside of the machine. That is, since the document is exposed with the side that will be sent to the platen 10 facing up, the document surface can be checked.

The fourth sheet path 16 is a path further branched from the third sheet path 13 in the switchback direction, and is for reversing both sides of the original. This path is formed by the guide 17 and the guide 17a and is used to switch back the document from the third sheet path 133 and guide it onto the platen 10.

Further, 18-19 and 20 are sheet feeding rollers, which transport the original passing through the sheet path 8 toward the platen glass 10 between the rollers 18 and 19, and feed the original passing through the meat path 11 between the rollers 19 and 20. Feed in one direction of tray.

Further, 21e21a, 22e22a, and 23s23a are feed roller pairs, respectively, and the roller pair 21e2a and roller pairs 22 and 22a feed the original from the platen glass 10 toward the feed tray 1, and then reverse to the second sheet path 1.
The document from 1 is switched back and sent to the third sheet path 13. Further, the roller pair 231123a reverses the document in the third sheet path 13 and conveys it in a direction in which one copy is taken out of the machine, and then reverses the document and sends it in the direction of the fourth sheet path 16 from the third sheet path 13. Further, reference numeral 24 denotes a flexible deflection plate, which is pasted on the guide 12 such that its tip is in contact with the document conveyance belt 27 or with a slight spacing therebetween. The leading edge of the document that has passed through the first sheet path 18 is pushed aside and passes through, and advances toward the platen 10. In addition, the document heading toward the sheet path 13 from the platen 10 is reliably guided to the second sheet path 13 because the tip of the deflection plate 24 is in contact with or close to the belt 27 .

At this time, the movable deflection plate 26 is in the state shown by the dotted line and directs the document toward the second sheet path 13.

Further, 25 is a similar deflection plate, and is pasted on the guide 14a so that its tip is in contact with the guide 12. The leading edge of the document that has passed through the sheet path 11 can be pushed aside and passed through. Further, the document heading from the second sheet path 11 to the third sheet path 13 is reliably guided to the path 13 because the tip of the deflecting plate 25 is pressed by the guide 12.

The movable deflection plate 26 is connected to the platen glass 10a of the first sheet path 8, the second sheet path 11, and the sheet path 16 of Buddha 4.
It is installed at the left end side confluence section. It is disposed parallel to the drive roller 27a of the belt 27, and is free to swing around shafts 28 at both ends. The holder 26 is always urged upwardly by a spring 29 to rotate, and the end 26a of the holder 26 is brought into contact with the stopper part 17c of the guide, so that the receiver is stopped. Note that 12c is wider in the width direction than the paper passing section. Further, when the plunger 30 is energized, the movable deflection plate 26 is rotated downward as shown by the dotted line.

When in the dotted line position, the document is directed from the first sheet path 8 toward the second sheet path 11, and when in the solid line position, the document is directed from the fourth sheet path 16 toward the platen 10. These deflection plates 24 and 25φ26 are made of flexible sheet-like material such as mylar or thin plate stainless steel.

Reference numerals 27a and 27b are document conveyance rollers, which rotate the document conveyance belt 27 provided on the platen 10 over almost its entire width to guide the document onto the platen 10, or to guide the document onto the platen 10. The document is conveyed to remove it from there.

Note that the document transport rollers 27a and 27b use the roller 27a as a driving roller and the roller 27b as a driven roller. Also, 31 is a belt presser, and the belt 27 is a glass 10
This is to ensure that the document is conveyed by the belt 27 by pressing it to the upper surface, and to obtain a clear image.

Sl is a transmission-type first sheet sensor disposed on the leading end side of the document stacking table 1, and detects the presence or absence of a sheet on the table L. S?
1 is a transmission-type second sheet sensor disposed in the middle of the first sheet path 8 between the sheet separation and supply section S and the feed rollers 18 and 19; S4 is a third sheet sensor disposed in the middle of the first sheet path 8 between the platen glass left end 10a and the feed roller 19°20. S5 is a fifth sheet sensor disposed in the partial speed formed by 14 and 14a of the third sheet path 13, and S6 is a fifth sheet sensor disposed between the feed rollers 23, 23a and the left end portion 10a of the platen glass. This is a sixth sheet sensor disposed in the middle of the fourth sheet path 16. 2nd sheet sensor to 6th sheet sensor, 5
Steps 2 to S6 detect the leading edge or trailing edge of the sheet passing through that position.

Reference numeral 40 denotes a weight member disposed above the through hole 1a of the document loading table 1, and is freely swingable about a shaft 41. This weight member 40 is normally connected to the first and second parts by a spring 42 (Fig. 2).
As shown by the two-dot chain line in the figure, it is lifted and held in the upper escape position around the shaft 41, and when the electromagnetic device 43 is energized, it rotates downward against the spring 42, and the half-moon roller 2 It comes into contact with the upper surface portion of the stacked sheet corresponding to the position and presses the sheet portion appropriately to apply a load. Due to the load acting on the stacked sheets P by the weight member 40, the feeding of the lowest sheet of the stacked sheets on the platform 1 by the half-moon roller 2 in the direction of the mechanism S is stabilized and ensured.

The driving of the separation supply section S will be explained using FIG. 5.

FIG. 5 is a drive system diagram of the separating means S, etc.

The example gear 114 is as follows. A gear 115 fixed to the shaft of a drive motor 113 is connected to a gear 17 via an intermediate gear 116. The gear 17 meshes with a gear 118 fixed to the shaft of the half-moon roller 2 and a gear 119 that drives the drive pulley 4a of the feeding belt 5. The gear 119 is connected via an intermediate gear 120 to a gear 121 fixed to the shaft of the drive pulley 6a of the separation belt 7.

A known one-way transmission clutch 122 is provided between the gear 119 and the drive pulley 4a of the feeding belt 5, and allows reverse feeding in the forward (counterclockwise) direction.

Next, the entire surface belt drive unit feed roller drive unit will be explained using FIGS. 6 and 7.

FIG. 6 is a top view of the main drive section.

Reference numeral 151 is a full-surface belt conveyance motor capable of forward and reverse rotation. 1
52 is a motor pulley attached to the shaft. On the other hand, a drive pulley 153 is attached to the shaft of the document conveyance drive roller 27a, and a motor pulley 152 and a drive pulley 1
A timing bell) 154 is hung between 53 and 53.

Further, an electromagnetic brake 155 is attached to the main shaft of the motor 151 in order to improve document stopping accuracy. Furthermore, a clock disk 156 and a photointerrupter 157 are attached to the back side of the main shaft to detect the rotation of the spindle.

Reference numeral 161 is a feeding roller drive motor that can rotate in forward and reverse directions. 1
62 is a mortar pulley attached thereto. on the other hand,
A pulley 163 is mounted on the main shaft of the feed roller 18, and a timing bell 164 is placed between 162 and 163. Further, a clock disk 165 and a photo interrupter 166 are attached to the rear side of the main shaft to detect the rotation of the motor.

Figure 7 is a front view of the main drive section.

In the figure, pulleys 171, 172, and 173 are attached to the front sides of the main shafts of the feed rollers 21, 22, and 23, and a gear 174 is attached to the front side of the feed roller 18. A gear 175 meshed with this gear 174 has a pulley portion 175a on the front side. Each pulley 171/17
Timing bells 1-176 are attached to 311175a, and timing bells 1 to 176 are also attached to pulleys 171 and 172.
77 is multiplied. As a result, the rotation of the feed roller drive motor 161 is controlled by the rotation of each feed roller drive motor 161.
・Transmitted to 23. Also, the feed roller 19 is the roller 18
Since the roller 20 is in pressure contact with the roller 19, it is driven.

Next, the operation will be explained.

A. If the original is a single-sided original, a.Specifically, as shown in the example in Figure 8, one set of 6-page single-sided originals P1 to P6 is attached to obtain N copies of single-sided or double-sided copies. shall be.

Single-sided originals P1 to P6 of pages from ■ to ■ are stacked on top of the pages with the younger pages facing up and the image surface facing upward, and the original bundle P1 to P6 is placed on the document placement table 1, and lifted and held with the table 1. The stack of originals is fully inserted between the stack of originals and the weight member 40, and the leading edge of the bundle of originals is brought into contact with the front surface of the regulating plate 44, and then set against the table l.

b. After setting copying conditions such as specifying that the set original is a single-sided original, the required number of copies N, and specifying single-sided copy mode or double-sided copy mode using the operation panel (not shown) on the copying machine main body 100, copying starts. Press the button.

C0 The copy start signal causes the partition plate 240 to be placed on top of the uppermost original of the stacked set originals on the table 1, as shown in FIG. As will be described later, this partition plate 240 separates the original P (shown by the two-dot chain line in FIG. 9) which has returned to the first side after the exposure process has been completed and the unexposed original P which is still on the table 1 while being fed. This is to separate the
The shaft 24 of the stepping motor 241 disposed outside b
2. Installation is supported. Normally, it hangs downward as shown by the second dotted line in Figure 9, and the motor 2 is activated by the copy start signal.
The shaft 242 of 41 rotates clockwise, and the partition plate 240 is placed on top of the stacked plate I/documents on the table 1 as shown by the solid line. The partition plate 240 gradually moves downward as the stacked sheet documents are sequentially fed from the bottom, and when the last sheet document on which the partition plate 240 is placed is fed, the partition plate 240 is supported. It disappears and hangs down again as shown by the two-dot chain line. During this drooping process, the partition plate 240 crosses the optical path of the photoelectric sensor 243, thereby detecting that the feeding of the first copy of the original has been completed.

d. Also, the electromagnetic device 43 (Fig. (4)) is activated by the copy start signal.
When the weight member 40 is energized, the weight member 40 moves downward to hold down the stacked sheet original.

01 Next, the driving of the half-moon roller 2 and single-sheet separation/conveyance mechanism S is started, and the lowest sheet document on table 1, that is, the ■th page document P6 (FIG. 8), is separated and conveyed one by one. Enter the first seat path 8.

f, the leading edge of the document P6 entering the first sheet path 8 is detected by the second sheet sensor S2, and then the feed roller pair 18-19, which has stopped rotating at that point, is detected.
It hits the nip and is caught. Feed roller 18
- 19 is driven in normal rotation after a predetermined timer time T1 has elapsed from the point in time when the sheet leading edge was detected by the second sheet sensor S2. By the time this timer time elapses, a predetermined amount of loops are formed in the document between the sheet separating and conveying mechanism S and the pair of rollers 18 and 19.

g. When the forward rotation of the pair of feed rollers 18-19 is started, the driving of the half-moon roller 2 and single sheet separation mechanism S' is stopped. Further, the power supply to the electromagnetic device 43 is cut off, and the weight member 40 is lifted and held in a state where it escapes from the upper surface of the document on the stacking sheet on the table 1. Roller 2 and mechanism S
Even if ' stops, the document P6 continues to be fed by the pair of feed rollers 18 and 1.
By normal rotation of the sheet 9, the sheet is drawn and conveyed within the first sheet path 8.

h0 Then, the leading edge of the document P6 is detected by the third sheet sensor S3
When detected, the forward rotation drive a of the full-surface belt 27 is started based on the signal. Then, the leading edge of the original P6 pushes aside 24, reaches the left end side of the platen glass IO, and then rotates forward through the gap between the full-surface belt 27 and the leading edge of the movable deflection plate 26, which has been switched to the chain line position. The image is sandwiched between the lower surface of the full-surface belt 27 and the platen glass lO with the image surface facing downward, and is transported along the surface of the platen glass 10 toward the right side of the glass by the transporting force of the full-surface belt 27.

11 Next, a predetermined clock (full-surface belt) after the passage of the trailing edge of the document P6 is detected by the third sheet sensor S3
When CLl has elapsed, the driving of the entire belt 27 is stopped. At the time of this stop, the trailing edge of the document P6 conveyed onto the platen glass 10 reaches a predetermined base line position O (FIG. 2).

The forward rotation of the pair of feed rollers 18 and 19 is stopped when a predetermined timer time T3 has elapsed after the passage of the trailing edge of the original P6 is detected by the second sheet sensor S2. This timer time T
3, the end of the document P6 has passed between the pair of feed rollers 18 and 19.

10 Next, based on the stop signal of the full-surface belt 27, the optical system on the copying graft 1!100 side is activated to execute the exposure copying process for the original P6 set on the platen glass 10 with the image surface facing downward. In this case, if the preset copy mode (described above) is single-sided copy mode, the image of the document P6 is formed on the first side of the copy material, and the copy material is placed in the copy tray (not shown) with the image side facing upward. )
is discharged to. Further, in the case of double-sided copying mode, the paper is not discharged to the copy tray but is temporarily fed to the re-conveying mechanism within the copying machine.

k1 Then, based on the exposure process completion signal for document P6 on the copying machine 100 side, the entire surface belt 27 is turned to reverse rotation. Since the movable deflection plate 26 is always switched to the position indicated by the chain line in the case of a single-sided original, the original P6 on the platen glass 10 is conveyed backwards toward the left end of the platen glass by the reverse rotation of the full-surface belt, and is moved to the position shown by the chain line. The sheet passes through the upper surface side of the movable deflection plate 26 at the position and enters into the second sheet path 11. Then, feed roller pair 19, 20 (normal rotation) → second sheet path 11 → feed reroller pair 2l-21a
(Forward rotation)→Transfer roller 22-22a→Exit The document is discharged to the document table 6 side with the image surface facing upward.

On the other hand, based on the exposure process completion signal for the document P6 on the copying machine 100 side, the electromagnetic device 43 of the weight member 40 is energized and the half-moon roller 2 and the single sheet separation and conveyance mechanism S' are driven in the same way as in items d-e above. is started, the first equinox # conveyance for the next lowest document P5 on table l is started, and the document P5 enters the first sheet path 8. Next, as in the above items f-g, the leading edge of the original P5 is detected by the second sheet sensor S2, and then it hits the nip between the feed rollers 18 and 19, which are not rotating at that point. It is received and a predetermined amount of loop is formed. Then, the document P detected by the second sheet sensor S2
After a predetermined timer time T1 has elapsed from the detection of the passing of the leading edge of the sheet 5, the forward rotation of the pair of feed rollers 18 and 19 is started, the drive of the half-moon roller and single sheet separation and conveyance mechanism S' is stopped, and the rotation of the weight member 40 is stopped. Power to the electromagnetic device 43 is cut off. Even if the drive of the rollers and mechanism S is stopped, the document P5 is still drawn and conveyed toward the platen glass IO by the forward rotation of the pair of feed rollers 18 and 19.

Therefore, the leading edge of this document P5 is detected by the third sheet sensor S3.
Until reaching the position, the exposed original P6, which has been reversely conveyed by the reverse rotation of the full-surface belt 27 and has entered the second sheet path 11 from the platen glass 10 side, has its leading edge at the timer time T1. It has already entered between the pair of feed rollers 19 and 20, which are in the normal rotation driving state as the feed rollers 18 and 19 are driven in normal rotation after the time-up.

Thereafter, when the leading edge of the document P5 conveyed toward the platen glass IO is detected by the third sheet sensor S3, the full-surface belt 27 is turned into a normal rotation a. Due to this normal rotation of the full-surface belt 27, the full-surface belt 27
A conveying force toward the right side of the platen glass acts on the exposed original P6 that has not been cut between the platen glass 10 and the platen glass 10, but the feed roller 1, which is driven in the forward direction, is stronger than the conveying force.
The document conveying force of 9 and 20 is overcome, and the document P6 is pulled out from between the entire surface belt 27 and the platen glass 10.

On the other hand, the original P5, which is conveyed toward the platen glass 10 by the normal rotation of the pair of feed rollers 18-1.9, is transferred to the platen glass 10.
From the left end side, it enters between the upper surface of the exposed original P6 that is being conveyed in reverse on the full-face belt 27 and the platen glass 10, and is transferred between the exposed original P6 and the exposed original P6 by the forward rotational conveyance force of the full-face belt 27. They are conveyed toward the right side of the platen glass 10 while rubbing against each other. When the passage of the trailing edge of the document P5 is detected by the third sheet sensor S3, the driving of the full-surface belt 27 is stopped when a predetermined clock CL2 has elapsed from the time of detection, similarly to the above-mentioned item i. At the time of this stop, the trailing edge of the document P5 conveyed onto the platen glass 10 reaches a predetermined base line position O.

Furthermore, by this point, the rear end of the exposed original P6, which has been reversely conveyed from above the platen glass 10, has already been removed from between the platen glass 10 and the entire surface belt 27.

In other words, by the reverse rotation of the full-surface belt 27, which is the first conveyance means, it passes from above the platen glass 10 into the second sheet path 11, which is the second guide, and is then connected to the feed roller pair 19φ20, which is the second conveyance means. The sheet discharge conveying force of the sheet by the pair of rollers passes through the first sheet path 8, which is a first guide, and then is transferred to the platen glass 1 by the full-surface belt 27, which is the first conveying means, which has been switched to forward rotation.
The conveying force of the next sheet introduced and conveyed onto the platen glass 10 by the full-surface belt is greater than that, and the friction coefficient between the sheet and the full-surface belt 27 serving as the first conveying means is greater than the friction coefficient between the sheets. Since the coefficient of friction between the sheet and the sheet is large, the conveyance of the discharge sheet and the introduction sheet by rubbing against each other on the platen glass 10 is always carried out reliably, stably, and smoothly.

When the forward rotation of the full-surface belt 27 is stopped, the optical system on the copying machine lOO side operates based on the signal, and the page original P5 is set on the platen glass 10 with the image side facing downward. The exposure/copying process is performed.

In this case, if the preset copy mode is single-sided copy mode, the image of the document P5 is formed on the first side of the copy material, and the copy material is ejected to the copy tray first with the image side facing upward. It is ejected onto the page copy material.

In addition, in the case of double-sided copying mode, the image of page 2 is formed on the second side of the copying material on which the image of page 2 has already been formed on the first side, and a double-sided copy is formed. ■E The 9th side faces upward and is ejected onto the copy tray.

m. Thereafter, by repeating the above-mentioned operations, the exposed original on the platen glass 10 is reversely fed, returned to the table 1,
A cycle of separating and transporting the lower original stacked on the table 1, feeding and setting the original onto the platen glass 10, and exposing the original is executed one after another. And the partition plate 240 is on it ■
When the page original P1 is fed from the table L, the partition plate 240 loses its support and hangs downward as shown by the two-dot chain line in FIG. As a result, it is input to the control circuit that the feeding of the first copy of the original has been completed. When the number of copies set in the copying machine is one, the partition plate 240 is kept hanging down, but when the number of copies set in the copying machine is set to multiple copies, the stepping motor is moved again after the page 1 of the document returns to the table L side. 241 is driven, and the topmost original on the table L, the ■ page, is placed on the table L. In addition, when multiple copies are set, when the ■ page original P1 is reversely conveyed from the platen glass lO, the re-feeding of the ■-th page original P6, which is the lowest original on the platform l, is started.

In this way, the stacked originals on table 1 are automatically and repeatedly conveyed 8 times in a row for the set number of copies. N copies of single-sided or double-sided copies are obtained.

B. If the manuscript is a double-sided manuscript, a. Specifically, as shown in the example in Figure 10, 3 pages 1 from ■ to ■
It is assumed that N single-sided or double-sided copies are obtained for a set of double-sided originals P1 to P3.

Stack the originals P1 to P3 in page order, and place them on the table 1 with the 9th side facing upward in the same way as in section A-a above.

b. After setting copying conditions such as specifying that the set original is a double-sided original, the required number of copies N, and single-sided copying mode or double-sided copying mode using the operation panel (not shown) on the copying machine main unit 10Q- side, Press the copy start button.

C0 This copy start signal causes the above A-c term to A-i
The lowest original P3 on table l is fed to platen glass lO through the same process as described in section 1 above.

(d) However, the document P3 fed onto the platen glass 10 is in a state where the E9 side is facing downward. After the document P3 is fed onto the platen glass 10, the entire surface belt 2
7 reverse rotations are made. At this time, the movable deflection plate 26 is held at the position shown by the chain line.

e. Due to the reverse rotation of the full-surface belt 27, the original P3 is conveyed in the opposite direction, passes through the upper surface of the movable deflecting plate 26, and enters the second sheet path. Then, it passes through the path of feed rollers 19 and 20 (normal rotation), second sheet path 11 → feed rerollers 21 and 21a (normal rotation) → feed rollers 22 and 22a.

f. When a predetermined timer time T4 has elapsed after passage of the trailing edge of the document P3 is detected by the fourth sheet sensor S4, the feed roller pairs 21, 21a, 22, and 22a are reversed. By the time-up of this timer time T4, the document P3
The rear end enters the third seat bath 1'3a and is connected to the roller pair 2.
It has reached just before 1.21a.

g. Due to the above-mentioned reversal of the roller pair 26 and 27, the document P3 in the third sheet path 20 is conveyed switchback and enters the third sheet bus 13, and then the document P3 in the third sheet path 20 is transferred to the feed roller pair 23 and 2.
3a enters into the third seat path 13b- where it is in the normal rotation state.

h. When a predetermined timer time T5 has elapsed after the passage of the trailing edge of the document P3 is detected by the fifth sheet sensor S5, the pair of feed rollers 23 and 23a are reversed. By the time the timer time T5 expires, the trailing edge of the document P3 has reached the front side of the roller 23#23a that enters the third sheet path 13b. At this time, the leading edge of the document is placed in the guide 15a-15.
It is turned over by the beam and exits the machine with the side that is about to be exposed facing up. In addition, opening/closing cover 3
Ribs 300a are attached to the outer surface of the document 00 to improve the sliding of the document (to make it difficult to be charged).

i. Due to the above-mentioned reversal of the roller pair 23 and 23a, the sheet P3
is conveyed switchback and enters the fourth sheet path 16. At this time, the movable deflection plate 26 is switched to the solid line position and passes through the upper surface of the movable deflection plate 26 toward the left side of the platen glass 10.

j, 1$4 When the passage of the leading edge of the document P3 that has entered the sheet lot 16 is detected by the sixth sheet sensor s6, the full-surface belt 27 starts normal rotation a, and the document P3 is moved from the upper surface of the movable deflection plate 26 → It passes through the gap between the tip edge of the movable deflection plate 26 and the full-face belt, enters between the platen glass 10 and the full-face belt 27 that is rotating in the normal direction, and is transported toward the left side of the platen glass IO by the transporting force of the belt 27. Ru.

k, the normal rotation a of the full-surface belt 27 is stopped at the time point when a predetermined clock CL2 has elapsed after the sixth sheet sensor S6 detects passage of the trailing edge of the document P3. At this point in time, the trailing edge of the document P3 conveyed onto the platen glass 10 reaches a predetermined base line position 0.

Then, by transporting the document up to section d- above, the document P3
The 9th surface is flipped downward and the platen glass lO
It is transported and set on top.

Next, based on the stop signal of the full-surface belt 27 mentioned above, the optical system on the copying machine 100 side is activated to close the platen glass 10.
The exposure/copying process is executed for the downward facing ■E9 side of the original P3 above. In this case, preset (section b)
If the copied copy mode is single-sided copy mode, ■E9
A side image is formed on the first side of the copy material, and the copy material is delivered to the copy tray with the image side facing upward.

In the case of double-sided copying mode, the paper is not discharged to the copy tray but is once fed to the re-conveying mechanism within the copying machine.

m1 Then, based on the exposure process completion signal for side E9 of document P3 on the copying machine 100 side, the entire surface belt 27 is turned to rotate in the reverse direction, and the document P3 is reversed on the platen glass lO to the left side of the glass. The sheet is transported and enters the second sheet path 11. At this time, the movable deflection plate 26 is switched to the position indicated by the chain line, and the same reversal conveyance as in the section e- is performed again. As a result, the original P3 is now set again on the platen glass 10 with the page side facing down.
■The exposure fist copying process for the page surface is copying gi
Executed on the oo side. In this case, if the copy mode is single-sided copy mode, the page surface is formed on the first side of the copy material, the image side is facing upward, and the page is ejected onto the copy tray first. is discharged. In addition, in the case of double-sided copy mode, the ■E-9 image is formed on the second side of the copying material on which the ■E-9 image has already been formed on the first side, forming a double-sided copy, and the ■page surface is facing upward. and is ejected onto the copy tray.

After the exposure process of the page surface is completed, the entire surface belt 2 is rotated in the reverse direction by the signal, and the movable deflection plate 26 is again changed to the position shown by the chain line.
The original document P2 passes through the second sheet path 11 and is transported back to the stand L side with the E screen facing upward, and the next document P2 is fed from the stand L in parallel. Then, the next document P2 is reversely fed in the above-mentioned terms d-n, and single-sided or double-sided copying is performed on the (1) page side, then (2) the page side, and the copies are discharged onto the copy tray.

Thus, by performing the above-mentioned operations one after another on the originals stacked on the document holding table 1, the original holding table 1 is finally placed on the tray of the copying machine, as in the case of section A above.
N copies of single-sided or double-sided copies having the same page order as the original set above are obtained.

In the case of a single-sided original as described in item A above, and a double-sided original as described in item B, the exposure on the platen glass 10 is completed, and the document is returned to the original platen l and transported to the uppermost original on the platen l. The original ejected to 1 naturally slides forward on the uppermost original on table 1 based on the downward slope of the front of table 1, and passes under the weight member 40 which is being held up at that point, i.e. The tip end of the weight member 40 is received by the front surface of the regulating plate 44 and settles down.

That is, the originals that are returned to the original placing table l one after another are always reloaded correctly on the upper surface of the stacked originals on the original holding table l without being obstructed by the weight member 40, thereby stabilizing the automatic repeated circulation conveyance of the originals. can be executed.

In addition, in parallel with the ejection and conveyance of the original from the platen glass 10, the feeding of the next original from one stand 1 is started, and the ejected and conveyed original and the fed original are conveyed by passing each other on the platen glass 10 (A- (2) and B-n), the time for supplying and discharging the document in each copying cycle is shortened, and copying can be carried out efficiently.

Next, regarding how to cancel the seat pass, see Figure 12 (a).
・(b) φ (C) Explain based on diagram.

The opening/closing cover portion 300 is rotatably mounted around a shaft 301 fixed to a side plate (not shown). Again 1
．． The feed rollers 21a*22a and 23a are attached by means such as springs. Furthermore, it has a fixing member A302 at a place separated from the paper passing section in the front and rear direction, and a fixing member B503 is provided on the side plate opposite to this, and when closed, A@
B is engaged and fixed. This fixing member A-B is a magnetic catch, a Delrin catch, or the like.

On the other hand, the C guide portion 400 is rotatably mounted around a shaft 401 fixed to the side plate. feed roller 1
9@20 is in this C guy part 1 400. Further, a plate spring 402 is attached at a position spaced from the paper passing section in the front-rear direction, and also has a protruding section 403. Opening/closing cover part 3
When the cover 00 is closed, the leaf spring 402 is pressed by the leaf spring 402 provided on the cover part 300 opposite the leaf spring 402.

As a result, a closing force is applied to the 0541 part 400. On the other hand, the force that closes the C guide 400 (counterclockwise force in the figure)
When it is applied, the protruding part 403 in the C guide hits the stock prong 404 fixed to the side plate, and the C guide 1 part 4
00 is fixed at a predetermined position. And opening/closing cover part 3
When 00 is rotated in the machine direction and released, a part 13a of the second sheet path 11 in the paper discharge direction and a third sheet path 13I are released.
I13b is released and the document stuck there can be removed.

Further, when the C-guy 1 section 400 is rotated in the 11 direction and opened, the fourth sheet path 16 and the first sheet path 8 are released, and the document located there can be removed.

If there is a document jammed in the second sheet lot 11 and part of it is between the belt 27 and the platen 10, the C guy 1 section 400 will rotate in the II force direction, that is, from the belt 27 and the platen 10. Since this is the direction in which the document is pulled out, the document can be easily removed without damaging the document.

Next, the branch opening mechanism will be explained.

In FIGS. 13(a) and II(b), 500 is a separation drive shaft that drives the separation roller 6a, and is rotatably attached to the separation unit side plate 503, and a holder 502 is rotatably attached to this shaft. . A separation driven shaft 501 supporting the separation roller 6 is rotatably attached to the holder 502, and a leaf spring 504 is also attached.

When the opening/closing cover portion 300 is closed, the C guide 400 is also fixed at a predetermined position as described above. At this time, a part 400a of the C guide 400 is attached to the leaf spring 504.
Press to rotate the entire boulder 502 in the direction B around the axis 500. As a result, a part of the holder 502 is brought into contact with the stopper portion 503a of the side plate of the separating section, and the separating rollers 6, 6a and the separating belt 7 are fixed at predetermined positions.

Now, place the opening/closing cover part 300 in the construction direction, and the C guy 1 part 400.
When rotated in the II force direction, the force pressing down on the leaf spring 504 is removed, the force for rotating the holder 502 in the B direction around the wf 500 is released, and the separation roller 6 and the separation belt 7 are rotated around the shaft 500. It becomes possible to rotate in the A direction,
The pressure in the separation supply section can be released.

As described above, according to the present embodiment, by rotating one side of the guide member that forms a part of the second sheet path in the paper ejection direction and the third sheet path in the first direction, ,
A part of the second sheet path in the paper ejection direction and the third sheet path are released, and one side of the guide member forming the first sheet path and the fourth sheet path (in the first direction and By rotating in the second direction (opposite), the first seat path and the fourth seat path are released. This has the effect of easily removing originals that have accumulated in each sheet path. Furthermore, even if there is a document during the second sheet pass and part of it is between the belt 27 and the platen 10, rotating in the second direction will pull out the document from between the belt 27 and the platen 10. , it also has the effect of being easier to remove. Furthermore, by linking the release operation with the release of the pressure in the separation and supply section, it becomes easier to remove the document that has remained in the separation and supply section.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily remove a document stuck in the conveyance path without damaging it.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an automatic document feeder to which an embodiment of the present invention is applied, FIG. 2 is a sectional view thereof, and FIGS. 3(a)
・Figure 3(b) is an explanatory diagram of the movable deflection plate, Figure 4 is a perspective view of the weight member, Figure 5 is an explanatory diagram of the separation unit drive, Figure 6 is a top view of the main drive unit, and Figure 7 is a front view of the main drive unit, No. 8
Fig. 10 is an explanatory diagram of the operation, Fig. 11 is an explanatory diagram of the Gide Pass (7), Fig. 12 (a) - Fig. 12 (b), and Fig. 12 (C) is an explanatory diagram of the guide opening/closing part. , Figure 13(a)
・Figure 13 (b) shows the theory of disbandment of the separated division. In Figure 8, l is the document loading table, S is the separation and feeding unit mechanism 27 is the document transport belt, 8 is the first sheet path, 11 is the second sheet path, 13 is the sheet path of WS3, and Mello is the fourth sheet path. Seat bath, 300 has a part of opening/closing cover, 4
00 is the C guide portion.

Claims (2)

[Claims] (1) A stacking section for stacking originals, a separating means for separating a large number of stacked originals one by one from the one below, and a separating means for reversing the originals from the separating means and guiding them to the entrance of the original processing section. 1 sheet path, a transport means capable of forward and reverse rotation for transporting the original from the entrance to the original processing unit to the original processing unit, and a stacking unit for reversing the original from the entrance to the original processing unit through the outside of the first sheet path. A second sheet path that returns the document in its original orientation; a third sheet path that branches off from the second sheet path in the switchback direction; and a third sheet path that branches off from the third sheet path in the switchback direction and returns the original. and a fourth sheet path following the processing section entrance, and rotates one side of a guide member forming a third sheet path and a part of the second sheet path in the paper ejection direction in the first direction. By doing so, a part of the second sheet path in the paper ejection direction and the third sheet path are released, and one side of the guide member forming the first sheet path and the fourth sheet path is removed from the second sheet path. A document conveying device characterized in that a first sheet path and a fourth sheet path are released by rotating in the direction of. (2) The document conveying device according to claim 1, wherein the document conveying device is configured to release the pressure in the separation supply section in conjunction with the sheet path release operation.