JPS6026560A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To eliminate accidents of sheet jam by locating sheet guide tongues in recesses on the tops of a plurality of sheet guide main ribs provided on the inner surface of a path constituting plate contacting ends of sheet guide members, and providing sub-ribs between the main ribs. CONSTITUTION:Notch recesses 212a are provided on the top surfaces of respective sheet guide main ribs 212. Tongues 210a' of sheet guide members 210 divided by notches 210c corresponding to the main ribs 212 are located to enter the recesses 212a on the main ribs 212. When a sheet P in a first path 201 is reversely transferred, the leading end of the sheet P is guided by the main ribs 212 and subribs 213 provided between the main ribs 212 to advnace toward sheet guide members 210, while ends of the tongues 210c are located in the recesses 212a. Since subribs 213 make an acute angle V with notches for dividing the respective tongues 210c, the sheet P is smoothly deflected and advanced along the surface of the member 210 in the direction of a third sheet path 203.

Description

[Detailed description of the invention] The present invention relates to a sheet feeding device.

More specifically, as shown in the first diagram, the first seat path 20
1, and a second one connected to the first one in a roughly Y shape.
and the third G-Dox 202 and 203 are turned to the right, and the sheet P introduced from the second sheet path 202 to the first sheet path 201 is swiveled back, or the first G-Dox 201 is The present invention relates to a sheet feeding device including a G-Dox mechanism for introducing a sheet introduced into the sheet path from the other opening side into the third sheet path 203.

204 to 207 are the first to third GITNOUS 201 mentioned above.
~ 203, the first to fourth passage configuration plates 201, 2011, 204
-205 facing each other, the second sheet path 20
2 is constituted by the first and third passage forming plates 204-206 facing each other, and the third seat path 203 is constituted by the second and fourth passage forming plates 202@207 facing each other.

208 Φ 208 is a pair of forward and reverse rollers disposed in the first sheet path 201, and the rotation indicated by the arrow a is normal rotation, and the rotation indicated by the arrow a is reverse rotation. 209・209 is the third seat pass 203
The sheet is rotated in the direction of arrow a by a pair of sheet relay conveyance rollers disposed at.

210 is connected to the passage branching part 211 of the first to third seat paths 201 to 203, and the rear side part 210b is connected to the fourth passage forming plate 2.
07 with an adhesive or the like, and the tip portion 210a extends diagonally in the direction of the first sheet path 201 and is arranged in elastic contact with the surface of the first passage forming plate 204. This is a sheet guide member made of a multi-layered elastic sheet (for example, Mylar sheet (trade name)). This sea (kite part) allows the sheet to enter the first sheet path 201 from the second sheet path 202 side, but the first sheet path 202
1 to +! ! Second sheet pass 20 of the transported sheet
2, and the sheet is transferred to the third sheet path 20.
The role of deflecting the course to the 3rd side is eliminated. Also, the first seat pass 2
When a sheet is introduced from the other 11 side of 01, it serves to deflect the sheet from the first sheet path 201 to the third sheet path 203.

Then, from the second seat pass 202 to the first seat pass 2
The leading end of the sheet P conveyed toward 01 is pushed between the sheet guide member 210 and the first path forming plate 207 with which the leading end of the sheet guide member 210 is in contact. It passes through against the pressure and enters the first sheet path 201. First seat pass 201
The sheet that has entered the roller pair 208, which is in a forward rotating state,
208 and is drawn into the first sheet path 201. Then, the rear end of the sheet is connected to the sheet guide member 2.
10 and the lth passage forming plate 207, the roller pair 208@208 is reversed. By reversing the pair of rollers 208, 208, the sheet in the first sheet path 201 is conveyed in the opposite direction, and as a result of this reverse conveyance, the trailing edge of the sheet, which has become the leading edge, is guided to the surface of the sheet guide member 210, and the sheet is transferred to the third sheet. The sheet is deflected in the direction of the path 203, enters the third sheet path 203, is relayed by a pair of rollers 209, and is conveyed. Also the first
from the other opening side of the seat path 201.
When the sheet is introduced into the roller pair 208, 208
is turned in the opposite direction, and the sheet passes through the first sheet path by the pair of rollers toward the sheet path branching section 211, and the leading end of the sheet passes through the sheet guide member 21 as described above.
0 and is deflected in the direction of the third sheet mass.

An example of a sheet feeding device including such a sheet path mechanism is an automatic sheet document feeding device (A, D, F) which has a function of reversing and feeding a sheet document onto a platen glass in a copying machine. There are devices for sorting sheets, sorters, etc.

By the way, one of the problems with a sheet feeding device including such a sheet path mechanism is that the first sheet path 21
An example of such trouble is jamming in the sheet guide member 210 portion of a sheet that has been conveyed backwards or conveyed from zero.

That is, this is because the thick surface at the leading end in the transport direction of the sheet reversely transported or transported from within the first sheet path 210 often protrudes from the thick surface at the leading end of the sheet guide member 210 to be caught and caught. This can lead to sheet jamming problems. In this case, even if the sheet guide member 210 is made as thin as possible, it is not possible to completely eliminate the problems described in "2."

The present invention has been proposed in view of the above, and by adding innovation to the shape and arrangement of the sheet guide member 210, it is possible to completely eliminate the sheet jam trouble caused by the thickness of the sheet kite member 10 described above. The aim is to provide the following.

That is, the present invention provides a sheet feeding device including such a sheet path mechanism, in which a plurality of sheet guide strips are provided at intervals in the sheet conveyance direction on the inner surface of the path forming plate that contacts the tip end of the sheet guide member. A main lip is provided, and each sheet guide tongue section is divided by an acute-angled cut along the length of the tip side of the sheet guide member.A guide tongue section is formed to correspond to the sheet guide main rib, and each sheet guide tongue section is Position the seat guide sub-ribs in the notched recesses formed on the top surface of each sheet guide main rib, and place them within the respective acute-angled notches; It was established in

2 to 4 show one embodiment, and in the figures, 212 is a passage forming plate that contacts the tip of the sheet guide member 210, and is a path forming plate 204. The inner surface of the first path forming plate 204 is shown as being mutually connected in the sheet conveying direction. A plurality of sheet guide main ribs 210a are arranged in parallel at intervals, and a substantially V-shaped acute-angled notch 210c is formed along the longitudinal length of the tip side of the sheet guide member 210, corresponding to each of the sheet guide main ribs. The sheet guide tongue portions 212a divided by the above are notched recesses formed on the top surface of each sheet guide main rib 212, and each sheet guide tongue portion 210a' of the sheet guide member 210 is inserted into each recess. It is located inside. Reference numeral 213 denotes sheet guide sub-ribs located within each V-shaped inset 210C and provided between the sheet guide main ribs 212 on the inner surface of the first passage forming plate 204.

With the above configuration, the second seat path 202 to the first seat path 201 formed between the sheet guide main rib 212 on the inner surface of the passage forming plate 204 of fJSl and the third passage forming plate 206 The sheet P facing toward
The pair of rollers 208 is pulled up from the tongue portion 12a, passes between the tongue portions 210c, the main ribs 212 and the sub ribs 213, enters the first sheet path 210, and rotates normally.
・Continues to be relayed by 208 to the first seat pass 2
Drawn into 01. When the rear end of the sheet cuts between each tongue piece m210c and the main rib 212 and the sub-rib 213, each tongue piece 210c is elastically inserted into the corresponding notch 212a of each main rib 212 again. It will be in the return state.

When the sheet in the sheet path 201 of the rear section 1 is reversely conveyed, the leading edge of the reversely conveyed sheet is located at the tip of the sheet introduced into the sheet path 201 from the other opening side of the first sheet path 201. The leading end advances toward the sheet guide member 210 while being guided by the main rib 212 and the sub rib 213 . At this time, each tongue portion 2'jOc- of the sheet guide member 240
The tips of the two are located in each recess 212a of the main rib 212, the sub lip 213 exists between each tongue portion 210a, and the notch dividing each tongue portion 210c is formed into an acute-angled V. Because of the shape, the leading edge of the sheet is prevented from entering the second sheet path 202 by 11 m, and the leading edge of the sheet is always smoothly moved into the sheet guide member 210 without getting caught in the sheet guide member 210 as in the conventional sheet guide member. The sheet is reliably deflected in the third sheet path direction along the plane 210, and troubles such as sheet jamming due to tension with the sea guide member 210 do not occur.

In addition, in the case of a sheet feeding device that carries sheets into the first sheet path 201 through the third sheet path 203, as shown in the second figure, the inner surfaces of the first and fourth path constituting plates 207 are also connected in the sheet conveying direction. Sheet guide ribs 214 are formed parallel to each other, and an acute-angled, substantially V-shaped notch 210d is formed in a portion corresponding to each of the sheet guide ribs 214 on the rear side of the sheet guide member 10. By configuring the sheet guide rib 214 to be positioned, the leading edge of the sheet from the third sheet path 203 toward the first sheet path 2'01 is caught on the rear side thick surface of the sheet guide member 10. It is possible to always smoothly introduce the sheet from the third sheet path 203 side to the first sheet path 201 side, which may cause a sheet jam trouble.

FIG. 5 and subsequent figures show an example of a circulating type A, D, F device (sheet document automatic feeding device) in a copying machine as a specific example of a sheet feeding device to which the present invention is applied. This sheet document automatic feeding device will be explained below.

′? In Fig. J5, lOO is the main copying machine, and 101 is a platen glass fitted into a large opening formed on the upper surface of the exterior casing. Image forming process equipment is built into the exterior casing of the copying machine 100, but these are omitted from the diagram.

A is a general code for devices A, D, and F, and device A is raised against the top surface of the machine casing including the platen glass 101 of the copying machine, centering on a hinge portion (not shown) provided on the rear side. It is attached so that it can be operated freely and is used in the folded position.

A, D, F In device A, l is the housing.

When device A is placed on top of the copier, the platen glass l
It has a planar shape and size that can sufficiently cover the ot, and has a flat box shape with an open bottom surface. Reference numeral 2 denotes a belt stretched between a drive roller 3 and a turn roller 4, which are arranged in parallel to each other on the left and right sides of the housing, and the belt 11 is stretched between the drive roller 3 and the turn roller 4, which are arranged parallel to each other on the left and right sides of the housing.
01 has a length and fist-width dimension in which the pertodo surface faces the entire upper surface.

Hereinafter, this belt 2 will be referred to as a full-surface belt. Reference numeral 5 denotes a plurality of lower belt pressing rollers arranged at appropriate intervals along the belt longitudinal direction between the lower belt and the upper belt of the full-surface belt 2, and when the device A is in the collapsed state, the lower belt The lower surface of the platen glass is moderately pressed against the upper surface of the platen glass, thereby increasing the conveying force of the sheet original along the glass surface due to the rotational drive of the belt 2. The drive roller 2 is selectively driven in forward and reverse directions by a drive mechanism (not shown), and the entire belt 2 accordingly rotates forward (counterclockwise) and reverse (clockwise). Ru.

Reference numeral 6 denotes a document stacking table which is arranged on the upper surface of the housing 1 in a downwardly inclined position (for example, about 200 sheets) with the left side, which is the tip side, at the lower side. The general code for the single sheet separation and conveyance mechanism connected to the leading end side of the placing table 6 is i.

Various single-mechanism mechanisms are known as the single-sheet separation and conveyance mechanism 7. In this example device, a sheet feeding belt 8 disposed on the lower side is rotationally driven in a forward direction in the sheet feeding direction, and a sheet separating belt 8 disposed on the upper side is rotationally driven in a direction opposite to the sheet feeding direction. A mechanism consisting of a combination of 9 is adopted. The detailed structure of this mechanism and the principle of separating and conveying one sheet are well known, so a description thereof will be omitted.

Reference numeral 10 denotes a roller as a sheet feeding auxiliary member disposed on the back side of the document mounting table 6 on the front side of the single sheet separation and conveyance mechanism 7. I'm going to face it. This roller lO is rotationally driven in the counterclockwise direction and acts on the lower surface of the lowest sheet of the stacked originals P on the table 1, so that one sheet is separated from the lowermost sheet by the transport mechanism 2.
send in a direction.

Reference numeral 11 denotes a front end receiving and regulating plate for the stacked sheets, which is disposed in front of the end of the sheet separation belt 9 on the side of the document placement table 6.

Reference numeral 12 denotes a weight member disposed above the through hole 6a of the document a placement table 6, and is freely swingable about a shaft 13. This weight member 12 is normally connected to the 5th and 6th by the spring 14 (Fig. 6).
The double-dotted chain line is held in the upper escape position around the shaft 13 by the handle, and when the electromagnetic device 15 is energized, it rotates downward against the spring 14 to release the seat. It comes into contact with the upper surface portion of the stacked sheets corresponding to the position of the feeding auxiliary roller 10 and presses the sheet portion appropriately to apply a load. Due to the load applied to the stacked sheets P by the weight member 12, the feeding of the lowest sheet of the stacked sheets on the table 6 in the direction of the mechanism 7 by the sheet feeding auxiliary roller 10 is stabilized and ensured.

16 is a general code of the sheet circulation conveyance sheet path mechanism. In this sheet lotus mechanism, 17 is 1 molecule per sheet.
lll: a first sheet path from the sheet exit side of the transport mechanism 7 to the left end of the platen glass 101; 18, a second sheet path from the left end of the platen glass 101 to the sheet discharge port 19 for the original storage table 6; 20; 21 is a fourth seat path connecting the left end of the platen glass 101 and the third seat path 20; 22 is a midway portion between the third seat path 20 and the second seat path 18; This is the 5th sheet pass that connects the .

For your convenience - 2nd Seat Pass 18 and 5th Seat Pass 2
The connecting portion with 2 is referred to as a sixth sheet path 18'.

Reference numerals 23 and 24 designate a pair of first sheet conveying rollers disposed in the middle of the first sheet, the tohas 17. 23 is a driving roller, and 24 is a driven roller. The drive roller 23 is driven by a drive mechanism (not shown) to rotate in the normal direction as shown by the solid line arrow or in the reverse direction as shown by the dotted line arrow.

Reference numeral 25 denotes a second sheet conveyance roller disposed midway along the sixth sheet path 18 in pair with the driven roller 24 of the first sheet conveyance roller pair 23-24/2, and 26 and 27 denote a third sheet conveyance roller.
A third sheet conveyance roller pair (
Sheet switchback roller pair), 28 and 29 are a fourth sheet conveyance roller pair (sheet switchback roller pair) disposed in the second sheet path l8'. The third and fourth sheet conveying roller pairs 26, 27, 28, and 29 are driven by a drive mechanism (not shown) to rotate in the normal direction as shown by the solid line arrows or in the reverse direction as shown by the dotted line arrows.

Reference numeral 31 denotes a sheet I/discharge roller disposed at the sheet exit section 19 of the second sheet path 18.

Reference numeral 32 denotes a deflector (sheet deflection plate) provided at the merging portion of the fourth sheet path 21 and the sixth sheet path 18' on the left end side of the platen glass. As shown in Figure 7, this deflector 32 is longer than the width of the fully vented sheet 2, and is disposed parallel to the drive roller 3 of the belt 2, with its center centered on the shafts 33-33 at both ends. It is free to swing and rotate. The deflector 32 is always urged upwardly by a spring 34, and both ends of the deflector 32 are connected to the driving rollers 3 of the belt 2.
The rollers 35 are disposed coaxially with the roller 3 at both ends thereof, and are brought into contact with and received by the lower surfaces of the outer peripheries of the rollers 35.

The above-mentioned rollers 35, 35 are rollers whose radius is approximately 0.5 mm larger than the radius of the drive roller 3 of the belt 2 plus the thick part of the belt 2, and these rollers 35, 35
serves as a spacer, and a small gap 36 of about 0-5 mm is formed and maintained between the tip edge of the deflector 32 and the outer periphery of the belt 2 suspended around the drive roller 3, as shown in FIG. When the electromagnetic device 37 is energized, the deflector 3 is rotated downwardly against the spring 34 about the shafts 33, 33 as shown by two-dot chain lines in FIG. As a result, the gap between the deflector 32 and the belt 2 is increased. Hereinafter, the attitude state of the deflector 32 shown by the chain line in FIG. 8 will be referred to as the fP, l switching attitude, and the attitude state indicated by the two-dot chain line will be referred to as the second switching attitude.

Reference numeral Sl denotes a transmission-type first sheet sensor disposed on the leading end side of the original table 6, and detects the presence or absence of a sheet on the table 6. S2
is a transmission-type second sheet sensor disposed in the middle of the ff51 sheet path 17 between the one-sheet M conveyance mechanism 7 and the first sheet conveyance roller pair 23-24, and S3 is the first sheet sensor)
l [Third sheet sensor disposed in the middle of the first sheet path 17 between the roller pair 23 and 24 and the left end of the platen glass 101, S4 is disposed near the wS3 sheet bus 20 in the fourth sheet path 21 4th sheet sensor, S5 is the 5th sheet sensor
f arranged near the second seat pass 18 of the seat pass 22
t55 sheet sensor, S6 is second sheet conveying roller pair 2
4, 25 and the left end of the platen glass 101.
This is a sixth sheet sensor disposed in the middle of the sheet path 18. The second to sixth sheet sensors S2 to S6 detect the leading edge and/or trailing edge of the sheet passing through that position.

38 is the 211th 5th and 6th seat pass 18-21/1
It is a sheet guide member arranged at the branch part of No. 8, and the second
The fifth and sixth sheet paths 18, 21/, 18 and the sheet guide member 38 correspond to the first to third sheet paths 201 to 203 and the sheet guide member 210 explained in FIGS. 1 to 4, respectively. The sheet guide member 38 in this example has the same configuration as the example in FIGS.
It is located at the branch of the Therefore, as will be described later, the leading edge of the sheet conveyed from the fifth sheet path 22 to the second sheet path 18 is on the upper surface side of the sheet guide member 38 and the upper path constituting plate surface of the second sheet path 18. The second seat path 18 can be entered easily through the gap between the seats. When the sheet that has entered the second sheet path 18 is then conveyed into the switch pack, the rear end of the sheet, which has become the leading edge, is guided to the lower surface side of the sheet guide member 38 and moved in the direction of the sixth sheet path 18. The sheet always reliably enters the sixth sheet path 18.

Next, the operation will be explained.

A. When the original is a single-sided original a. Specifically, as shown in the example in FIG. 10, N copies of single-sided or double-sided copies are obtained for each set of 6 single-sided originals P1 to P6 of pages 1 to 2.

Stack the single-sided originals P and ~P6 of ■~■ pages in page order with the younger pages facing up and the image surface facing upward, place the original bundle Pl-P6 on the original platen 6, and lift it up and hold it with the platen 6. The stack of originals is fully inserted between the weight member 12 and the stack of originals so that the leading edge of the bundle of originals is in contact with the front surface of the regulating plate 11, and is set on the table 6.

b. Start copying after setting copy 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 side of the fi100 copying machine. Press the button.

C1 The copy start signal causes the partition plate 40 to be placed on top of the uppermost original of the stacked originals on the table 6, as shown in FIGS. 5 and 9. As will be described later, this partition plate 40 separates the original P (shown by two-dot chain line in FIG. 9) that has returned to the stand 6 after the exposure process has been completed and the unexposed original P that is still on the stand 6 waiting to be fed. This is to separate the side wall 6 on the back side of the stand 6.
It is mounted and supported by a shaft 42 of a stepping motor 41 disposed outside b. It normally hangs downward as shown by the two-dot chain line in Figure 9, and the remoter 41 is activated by the copy start signal.
The shaft 42 rotates clockwise, so that the partition plate 40 is placed on top of the uppermost original of the set originals on the table 6, as shown by the solid line. The partition plate 40 gradually moves downward as the stacked sheet documents are fed sequentially from the bottom, and when the last sheet document on which the partition plate 40 is placed is fed, the partition plate 40 is supported. 2. d It hangs down as shown by the chain line. During this drooping process, the partition plate 40 crosses the optical path of the photoelectric sensor 43, and thereby it is detected that the feeding of the first copy of the original has been completed.

d. Also, in response to the copy start signal, the electromagnetic device 15 (FIG. 6) is energized, and the weight member 12 moves downward to hold down the stacked sheet original.

e. Next, the drive of the sheet feeding auxiliary roller 10 and single sheet separation conveyance mechanism 7 is started, and the lowest sheet document on the table 6, that is, the document P6 of the ■th page (FIG. 10) is separated into one sheet. The sheet is conveyed and enters the first sheet path 17.

f, the leading edge of the original aP 6 entering the first sheet path 17 is detected by the second sheet sensor S2, and then it hits the nip portion of the first sheet conveying roller pair 23φ24, which has stopped rotating at that point. It can be accepted.

The first sheet conveying roller pair 23Φ24 is driven to stop rotating after a predetermined timer time T1 has elapsed from the time when the leading edge of the sheet was detected by the second sheet sensor S2. Until this timer time elapses, one sheet separation and conveyance mechanism 2 and roller pair 23
- A predetermined amount of loops are formed on the document within 24 hours.

g. When the first pair of sheet conveyance rollers 23 and 24 start to rotate normally, the drive of the sheet feeding auxiliary roller 10 and the single sheet separation and conveyance mechanism 7 is stopped. Further, the power to the electromagnetic device 15 is cut off, and the weight member 12 is lifted and held away from the upper surface of the stacked sheet originals on the table 6. Even when the roller lO and the mechanism 7 stop, the document P6 continues to be drawn and conveyed in the first sheet lot 17 by the normal rotation of the first sheet conveying roller pair 23-24, and then the leading edge of the document P6 is transferred to the second sheet roller S3. When detected, the forward rotation drive of the entire surface belt 2 is started based on the signal. Then, the leading edge of the document P6 reaches the left end side of the platen glass 101, and then rotates in the normal direction through the gap 36 (Fig. 1O) between the entire surface belt 2 and the leading edge of the deflector 32 in the first switching position. The image is sandwiched between the lower surface of the full-surface belt 2 and the platen glass 101 with the image surface facing downward, and is transported along the surface of the platen glass 101 toward the right side of the glass by the transporting force of the full-ml belt 2.

i. Then, when a predetermined timer time T2 has elapsed after the passage of the trailing edge of the document P6 is detected by the second sheet sensor S3, the driving of the entire surface of the belt 2 is stopped. At the time of this stop, the trailing edge of the document P6 conveyed onto the platen glass 101 reaches a predetermined base line position O (FIG. 5).

The forward rotation of the first sheet conveying roller pair 23-24 is driven by the document P.
After the passage of the rear end of 6 is detected by sensor S2, it is stopped when a predetermined timer time T3 elapses. Within this timer time T3, the trailing edge of the document P has completed passing between the first pair of sheet conveying rollers 23 and 24.

j. Next, based on the stop signal of the full-surface belt 2, the optical system on the side of the copying machine main unit 100 is activated to close the platen glass 10.
The exposure copying process is performed on the document P6, which is set on the document P1 with the image surface facing downward. In this case, if the preset copy mode (see above) is single-sided copy mode, the image of the document P6 is formed on the 18th side of the copy material, and the copy material is placed in the copy tray (with the image side facing upward). (not shown). Further, in the case of double-sided copying mode, the paper is not transferred to the copy tray, but is temporarily fed to the conveyance mechanism within the copying machine.

Next, based on the exposure process completion signal for the original P6 from the copying machine 100, the full-surface belt 2 is turned to the reverse rotation port. The deflector 32 also includes an electromagnetic device 37 (
(FIG. 7) is energized and converted to the second switching attitude (shown by the two-dot chain line in FIG. 8). As a result, the platen glass 10
The original P6 on the first sheet is reversely conveyed toward the left end side of the platen glass by the reversing rotation opening of the full-surface belt, passes through the upper surface side of the deflector 32 in the second switching posture, and is transferred to the sixth sheet path 1.
Enter 8. and a second sheet conveyance roller pair 24.
25 (normal rotation) → second sheet bus 18 → fourth sheet conveyance roller pair 28 and 29 (normal rotation) → discharge roller 31 → exit 19
The document is discharged through the path 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 4!1ioo side, the electromagnetic device 15 of the weight member 12 is energized, the sheet feeding auxiliary roller 10 is activated, and the sheet is separated and conveyed in the same way as in the above sections d-e. The driving of the mechanism 7 is started, and the conveyance of one sheet m of the lowest original P5 next to '' is started on the first unit 6, and the original Ps is transferred to the first sheet pass 1.
Enter 7. Next, as in the above-mentioned items f and g, the passage of the leading edge of the original P5 is detected by the second sheet sensor S2, and then the rotation of the original P5 is stopped at that point.
The sheet is abutted against and received by the nip portion of the pair of l-sheet transport rollers 23 and 24, forming a loop of a predetermined amount. Then, after a predetermined timer time T1 has elapsed since the second sheet sensor S2 detects passage of the leading edge of the original P5, the first pair of sheet conveying rollers 23 and 24 are started to rotate forward, and the sheet feeding auxiliary roller lO and one sheet are separated. The drive of the transport mechanism 7 is stopped, and the power to the electromagnetic device 15 of the weight member 12 is cut off. Even when the driving of the roller IO and the mechanism 7 is stopped, the document P5 is still drawn and conveyed toward the platen glass 101 by the forward rotation of the first pair of sheet conveying rollers 23 and 24.

Then, before the leading edge of this document P5 reached the second sheet sensor S3 position, it was reversely conveyed by the reverse rotation of the full-surface belt 2 and entered the sixth sheet path 18 from between the platen glasses 101. The leading edge of the exposed document P6 is rotated in the forward direction by the second sheet conveyance roller pair 24, which is in the normal rotation driving state as the first sheet conveyance roller pair 23, 24 is driven in the forward rotation after the timer time T1 has expired. It has already entered the area within 25 days.

Thereafter, when the leading edge of the document P5 conveyed toward the platen glass 101 is detected by the second sheet sensor S3, the full-surface belt 2 is turned into normal rotation. Due to the forward rotation of the full-surface belt 2, a conveying force toward the right side of the platen glass acts on the exposed document P6, which has not yet cut the gap between the full-surface belt 2 and the platen glass 101, but the conveying force is greater than the conveying force. The document conveyance force by the pair of second sheet conveyance rollers 24 and 25 which are driven in normal rotation is overcome, and the document P6 is pulled out from between the entire surface belt 2 and the platen glass 101.

On the other hand, the document P5, which has been conveyed in the direction toward the platen glass 101 due to the stop rotation of the first pair of sheet conveyance rollers 23 and 24, is transferred from the left end side of the platen glass 101 to the full-surface belt 2 which is rotating in the forward direction.
Exposed original P being transported in reverse on the platen glass lot.
6 and is conveyed toward the right side of the platen glass 101 by the forward rotational conveyance force of the full-surface belt 2 while rubbing against each other with the exposed document P6. And the manuscript P
When the passage of the rear end of 5 is detected by the third sheet sensor S3, the predetermined timer T2 is
The driving of the entire belt 2 is stopped at the point in time when . At the time of this stop, the document P5 conveyed to the platen glass 101
The rear end side of has reached 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 101, has already been removed from between the platen glass 101 and the entire belt 2.

When the forward rotation of the full-surface belt 2 is stopped, the optical system on the copying machine 10 side operates based on the signal, and the image is placed on the platen glass 101 with the image surface facing downward. The exposure/copying process is executed for the original page P5.In this case, if the preset copy mode is single-sided copy mode, the image of the original P5 is formed on the first side of the copy material, and is ejected with the image side facing upward, and is ejected onto the copy material of the ■page that has been ejected to the copy tray first.In addition, if it is in double-sided copy mode, the image of the ■page has already been formed on the 151st side of the copy. ■ On the second side of the material
The image of the page number is formed to form a double-sided copy, and the double-sided copy is discharged onto the copy tray with the 9th side facing upward.

m. Thereafter, by repeating the above-mentioned operations, the exposed original on the platen glass 101 is reversely fed, returned to the table 6, one sheet of the lower original of the stacked originals on the table 6 is separated and conveyed, and the platen glass is moved. A cycle of feeding and setting the original to O-1 and exposing the original is executed one after another. And the falling partition'Mj1.4
When the ■page original P1 containing 0 is fed from the table 6, the partition plate 40 loses its support and points 2C in Fig. 9
As shown by line I, the document 100 is in a state of hanging downward, and in the process of the hanging movement, it crosses the optical path of the sensor 43, thereby inputting to the control circuit that the feeding of the first copy of the original has been completed. When the number of copies set on the copying machine is one, the partition plate 40 is kept hanging down, but when the number of copies set on the copying machine is multiple, ■ After the page 1 of the original returns to the stand 6 side, the partition plate 40 is stepped again. The motor 41 is driven and the document Pl is placed on the topmost document Pl of the ■ page on the table 6. In addition, when multiple copies are set, when the original P of page 1 is reversely conveyed from the platen glass 101, the refeeding of the original P of page 2, which is the lowest original on table 6, is started.

n: In this way, the stacked originals on the table 6 are automatically repeatedly conveyed in a circular manner for the set number of copies N times, and the originals set on the original platen 6 are placed on the copy tray of the copying machine in the same page order as the originals set on the original platen 6. N copies of single-sided or double-sided copies are obtained.

B. If the original is a double-sided original, a. Specifically, as shown in the example in the ftTJl1 diagram, J of the
J-side or double-sided copies shall be obtained.

Stack the originals P1 to P3 in page order and place them on the table 6'' with the 9 sides facing upward in the same way as in section A-a above.

b. After setting the copying conditions such as that the set original is a double-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 side, start copying. Press the button.

C1 In response to this copy start signal, the lowest original P3 on the table G is fed to the platen glass IO1 through the same process as the above-mentioned items A-c to A-i.

(d) However, the document P3 fed onto this platen glass 101 is in a state where the E9 side is facing downward. The manuscript P3
After being fed onto the platen glass 101, the full-surface belt 2 is rotated in the reverse direction. The deflector 32 is held in the first switching position.

e, Full surface, by the reverse rotation of the belt 2, the document P3 is reversely conveyed, passes through the lower surface of the deflector 32, enters the fourth sheet bath, and then the third sheet conveying roller pair 26, 27
enters the third seat path 20 which is in a normal rotation state.

f, when a predetermined timer time T4 has elapsed after the passage of the trailing edge of the document P3 is detected by the fourth sheet sensor S4, the third sheet sensor
The sheet conveying roller pair 26-27 is reversed. By the time the timer time T4 expires, the trailing edge of the document P3 has entered the third sheet path 20 and has reached the front side of the roller pair 26 and 27.

g, due to the above-mentioned reversal of the roller pairs 26@, 2.7, the original JA p 3 in the third sea bus 20 is switched back m and enters the fifth sheet path 22, and then the fourth sheet conveying roller pair 28 and 29 enter the second seat bus 18, which is in a 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 fourth sheet sensor
The pair of sheet conveying rollers 28 and 29 are reversely rotated. By the time the timer time T5 expires, the trailing edge of the document P3 has reached the front of the pair of rollers 28 and 29 that cuts through the sheet guide member 38 and enters the second sheet path 18 side.

i, the sheet P3 is conveyed in a switchback manner by the above-mentioned reversal of the roller pair 28 and 29, and the second sheet conveyance roller pair 24
−． 25 enters the sixth sheet path 18 which is in the reversed state, passes through the upper surface of the deflector 32 which is in the first switching position, and heads toward the left side of the platen glass 101.

j. When the passage of the leading edge of the document P3 that has entered the sixth sheet path 18 is detected by the sixth sheet sensor S6, the full-surface belt 2 starts to rotate in the normal direction, and the document P3 moves toward the deflector 3.
2 → the top surface of the deflector 32 passes through the gap 36 between the tip edge of the deflector 32 and the full-face belt 2, and enters between the platen glass 101 and the full-face belt 2 which is rotating normally, and the conveying force of the belt 2 causes the platen glass 101 to be It is transported towards the left side.

k, the stop rotation of the full-surface belt 2 is stopped when a predetermined timer time T6 has elapsed after the passage of the trailing edge of the document P3 is detected by the sixth sheet sensor S6. At the time of this stop, the trailing edge of the document P3 conveyed onto the platen glass 101 reaches a predetermined base line position 0.

Then, by transporting the document up to section d- above, the document P3
■The platen glass is turned upside down with the paper surface facing downward.
It is transported and set on t. Next, based on the stop signal of the full-surface belt 2 described in Section 7, the optical system on the copying machine 100 side is activated to execute the exposure/copying process for the downward facing 9 surface of the document P3 on the platen glass 1O1. In this case, if the copy mode set in advance (section b) is single-sided copy mode, the image on page 9 will be formed on the first side of the copy material, and the copy material will be ejected to the copy tray with the image side facing upward. Ru. In the case of double-sided copying mode, the paper is not discharged to the copy tray but is temporarily fed to the TRP transport mechanism within the copying machine.

m, then based on the exposure process completion signal for side 9 of document P3 on the copying machine 100 side, the entire surface belt 2 rotates in reverse [1], and the document P3 passes over the platen glass lot to the left side of the glass. The sheet is reversely conveyed to , enters the fourth sheet path 21, and is again reversely conveyed in the same way as in the section e-. As a result, the original Pj is now set again on the platen glass 1O1 with the page side facing downward, and the exposure and copying process for the 2nd side of the page is carried out by the copying machine 1.
Executed on the 00 side. In this case, if the copy mode is single-sided copy mode, the second side 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 to the top. In addition, in the case of double-sided copying mode, the ■E9 image is formed on the second side of the copying material on which the ■E9 image has already been formed on the first side, forming a double-sided copy, and the ■E9 image is formed on the second side. is ejected onto the copy tray with the paper facing upward.

After the exposure process for the second side 0 and ■E is completed, the entire surface belt 2 is rotated in the reverse direction in response to the signal, and the deflector 23 is also changed to the second switching attitude, and the document P is rotated in the same manner as in the previous section.
3 passes through the sixth and second sheet buses 18, 18, and is transported back to the table 6 side with the surface 9 facing upward, and in parallel, the next document P2 is fed from the table 6. Ru. Then, the next document P2 is reversely fed according to the above d''n term, and single-sided or double-sided copying is performed on the 9th side of ■E and then the 9th side of E, and the copies are discharged onto the copy tray. .

P. Thus, the following operations are performed one after another on the originals loaded on the document tray 6-, and the originals are 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 on the table 6 are obtained.

In the case of a single-sided original as described in item A and a double-sided original as described in item B, the exposure on the platen glass 101 is completed, and the document is returned to the original storage table 6 and transported to the uppermost original on the table 6. The original ejected to the table 6 naturally slides forward on the uppermost original on the table 6 based on the downward slope of the front of the table 6, and passes under the weight member 12 which is being lifted and held at that point. The tip side of the member 12 is received by the front surface of the regulating plate 11 and falls down.

That is, the originals that are returned to the original placing table 6 one after another are always correctly stacked on the upper surface of the originals on the original holding table 6 without being obstructed by the weight member 12. This allows the automatic repeated circular conveyance of the originals. It can be executed stably.

Also, as in the embodiment device, in parallel with the ejection and transportation of the original from the platen glass 101, feeding of the next original is started from the table 6, and the ejected and transported original and the fed original are rubbed against each other on the platen glass 101. Configuration to be transported (section A-,
By using the item B-o), the time for supplying and discharging original documents in each copying cycle is shortened, and copying can be carried out efficiently.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of the sheet path for conveying the sheet in a swivel-back manner, Fig. 2 is a rear view of a part of the sheet guide member, and Figs. 3 and 4 are the lines m-■ in Fig. 2, and IV
- A sectional view taken along the line IV, Fig. 5 is a vertical sectional front view of an example of a circulating type automatic sheet document feeder (A, port, F device), and Fig. 6 is an inclined surface of the unit 4' oscillating mechanism. Figure 7 is a perspective view of the deflector swinging mechanism, Figure 8 is an enlarged cross-sectional view of the deflector and full-surface belt drive roller, Figure 9 is a side view of the partition plate, Figure 10 and FIG. 11 is a diagram showing the page order of a single-sided original and a double-sided original, respectively. / 201-203, 17・ 18-18 ・ 20 ・
21 and 22 are sheet paths, 210-38 are sheet guide members, 6 is a document mounting table, 7 is a single document (sheet) separation and conveyance mechanism, 16 is a sheet path mechanism, 2 is a full-surface belt, 10
1 is the platen glass. Patent applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] (+) It has a first sheet path and second and third sheet paths communicating with the first sheet path, and the sheet introduced from the first sheet path side is connected to the first sheet path. A sheet guide member disposed at a branching part of the third sheet path prevents the sheet from entering the second sheet path, deflects the sheet toward the third sheet path, and causes the sheet to be introduced into the third sheet path. -1- A plurality of sheet kite main ribs are provided at intervals from each other in the sheet conveyance direction on the inner surface of the passage constituting plate that contacts the leading edge of the sheet guide member, and the leading edge of the sheet guide member Sheet guide tongue pieces divided by acute-angled cuts along the length are formed corresponding to the seat guy 1: main rib, and the individual sheet guide tongue pieces are formed on the top surface of each sheet guide main rib. A seat kite characterized in that main ribs of the sheet kite, which are positioned in the cutout recesses and located within the individual acute-angled notches, are provided between the individual seat kite main ribs on the inner surface of the passage forming plate. Feeding device.