JPS63171724A - Recording sheet conveyor - Google Patents

Abstract

PURPOSE:To align each of refeeding sheets as well as to convey them in an accurate manner, by installing a blast port, jetting an air flow upward aslant, on a sheet mounting surface of an intermediate tray. CONSTITUTION:At the center of the width direction of a stacker base 101, two pieces of longitudinal, oval openings 105 are bored in position slightly nearer to the upper part of an incline, and a motorized fan 104 is attached to the lower part. On the stacker base 101, there are provided with the fan 104 and a nozzle hole 106 so as to jet an air flow being reverse to the discharge direction of various sizes of copying paper discharged out of a turnover conveying part 9 and more upward than the horizontal direction. The air flow jetted out of the nozzle hole 106 gets into the underside of the copying paper discharged and dropped on the stacker base 101, putting the copying paper on an air film, whereby it is made so as to slide on top of the stacker base 101.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a sheet paper conveyance device used in image recording devices such as electrophotographic copying machines, printing devices, etc., and in particular to an improvement of a recording sheet conveyance device in an automatic double-sided recording device that can record images on both sides of a sheet of paper. It is related to.

[Conventional technology]

Generally, in image recording devices such as electrophotographic copying machines, printing devices, etc., various technologies have been proposed for automatic double-sided recording devices that can record not only on one side of a recording sheet (but also on both sides).Conventional automatic double-sided recording devices In this system, an image is recorded on one side of the sheet in the image processing section, the sheet is temporarily stocked in the middle, and the sheet is conveyed again and sent to the image forming section. Sheet circulation conveyance devices are disclosed in various publications such as JP-A-59-82247, JP-A-59-114227, and JP-A-60-2241. The direction of the recording sheet (copy paper) that has been copied on one side is changed and conveyed to the lower part of the copying section and stored in a part of the stacker, and the sheet is sent out again, conveyed upward, the direction is changed, and the sheet is fed to the copying section. , the other side of the sheet is copied, and since the direction of the sheet is changed twice before copying one side and then copying the other side, it is necessary to reverse the sheet once in the middle of the path. Conventional conveyance devices for reversing sheets include a method in which the sheet is placed in a separate path branching off from the original path and then returned to the original path in a switchback manner, and a method in which the sheet is stretched between two shafts. A method was adopted in which an endless belt was used and the paper was reversed at the end. In both of the above methods, the copy sheets with single-sided copies once accumulated in a part of the stacker are re-fed with the trailing edge leading. The toner image formed on the photoreceptor is transferred to the other side of the copy paper by passing through a conveying device and a conveying kite, and then enters the image forming section again. In some stackers of conventional sheet conveying devices, a blower fan is installed below the bottom of the intermediate tray where sheets are temporarily deposited, and an upward air stream is ejected to cause the sheets to fall. In some cases, the intermediate tray has an inclined surface that can be easily slid down.In other words, an opening for blowing air is provided on the sheet mounting surface of the intermediate tray equipped with the fan, and an appropriate airflow is carried out from this opening. The rising airflow allows air to sneak under the sheet, making it easy to slide down. In such a sheet fine feeding device, at least one sheet with an image recorded on one side of the sheet is moved to the stacker. Some of the sheets are temporarily stored on the intermediate tray, and the leading edge of each sheet is aligned on the side plate of the refeeding means.At this time, the pressing plate is retracted upward.Refeeding is started. Then,
As the suppression plate descends and presses the sheet, the feed roller is driven and rotated, and one or more sheets held between the suppression plate and the sheet are sent out to the double-feed prevention means, where the sheets are separated. , one sheet passes through the gap between the upper and lower side plates and is sent to the next conveying means.

[Problems to be Solved by the Invention] The problems of the conventional automatic double-sided recording device described above)! In the feeding device, on the sheet placement surface of the intermediate tray equipped with a blower fan, the large-sized sheets, for example, 84-size or ^3-size sheets, have a large weight and have a large contact area, making it difficult for them to slide down. , requiring large ventilation openings. Also, the total length of the above 84 size (364zz) and the total length of ^3 size (420z)
In the intermediate tray that can be loaded with z), the sheet end positions are different (the difference is about 56 iU+), so the ventilation opening that raises the sheets of both sizes must be made large enough to almost encompass the sheet ends of both sizes. No. However, if the ventilation opening is made larger, the end of the sheet conveyed onto the intermediate tray may get caught in the green of the opening, making it impossible to arrange the sheets in the correct position. [Means for Solving the Problems] The present invention eliminates the problems in the sheet conveying device of the conventional automatic double-sided recording apparatus as described above, and accurately aligns the sheets to be re-fed from the stacking section. It is an object of the present invention to provide a recording sheet transport device that can transport the recording sheet reliably. A recording sheet conveying device of the present invention that achieves this object temporarily stores recording sheets conveyed from an entrance path on an intermediate tray, and then feeds the sheets again from the intermediate tray in a direction opposite to the conveying direction. In the conveying device, an air blowing port of a blowing fan is provided on the sheet placement surface of the intermediate tray and is configured to blow an air flow obliquely upward facing the conveying direction of the sheet conveyed onto the intermediate tray. The opening is characterized in that it has a shape in which a plurality of a-long openings having a long axis in the sheet conveyance direction are arranged in parallel.

【Example】

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. tjIJ1 is a cross-sectional view of a main part showing a paper feed path of a double-sided copying device equipped with a sheet conveying device to which the present invention is applied, FIG. 2 is a perspective view of the sheet conveying device, and FIG. 3 is a configuration diagram of the double-sided copying device. FIG. 4 is a schematic diagram illustrating the automatic double-sided copying function. In FIG. 3, 1 is an automatic document feeder, 2 is a scanning exposure optical system, 3 is an image forming section around a photosensitive drum, 4 is a copy paper supply ff1s (paper feed section), 5 is a copy paper transport section, 6 7 is a fixing device, 7 is a reversal sheet discharge switching section, 8 is a branching conveyance section, 9 is a reverse conveyance section, 10 is a part of the stacker, and 11 is a sheet refeeding section. Note that 9.10 and 11 are stacker units housed in a frame. Next, the copy paper feeding process will be explained with reference to FIGS. 1 to 4. Copy paper P1 for single-sided copying stored in the paper feed cassette or paper feed tray of the paper feed section 4 is fed out one by one by the operation of the selected paper feed means, fed into the copy paper conveyance section 5, and then continued. In the image forming section 3, an original image of an original document placed W1 automatically or manually on an original table glass is formed on copy paper P1. The copy paper P, which has been copied on one side, is heat-fixed by the fixing device 6 via the conveyor belt of the conveyor section 5. On the downstream side of the fixing device 5, there is a paper discharge path a for straightly advancing the copy paper P1 after fixing and for discharging it outside the machine, and a lower path plate 71 for double-sided copying or reverse paper discharge. The paper switching unit 7, which is equipped with a branching mechanism that has the function of switching the introduction path to be introduced, swings around an id plate 71, an upstream roller 72 consisting of upper and lower rollers, a downstream loaf 73, and a transfer 74. It is composed of a movable branch body (7 levers) 75 with an inverted triangular cross section and an electromagnetic lever/id (not shown) □, etc. A paper path a1 - an introduction path b that continues to the id plate 71 along one side, and a reversal paper discharge path C that communicates the id plate 71 and the downstream roller 73 along the other side. Is the movable branch body 75 a driving device such as an electromagnetic trenoid? ! (not shown) causes the right tip on the upstream roller 71 side to move up and down in the vicinity of the pressure contact point of the roller 71, opening the introduction path and closing the paper discharge path a, or vice versa. Furthermore, when the movable branch body 5 opens the introduction path as described above, the lower tip of the movable branch body 75
The copy paper P2 approaches the guide plate 71 on the outside of the path C, leaving a small gap for the copy paper P2 to pass through, and the outside of the reverse sheet discharge path C is spaced further apart from the guide plate 71. Therefore, the fixed copy paper P2 passes through the right tip of the movable branch body 75, enters and descends into the introduction path, passes through the lower tip of the movable branch body F5, passes through the side plate 71, and enters the introduction path 8. When the copy paper is switched back by the reverse rotation of the forward/reverse roller 81 and conveyed in the reverse direction to the reverse paper discharge path C, the copy paper is prevented from flowing backward into the introduction path. The copy paper P2 sent downward through the reversal sheet discharge switching section 7 is transferred to forward and reverse rollers 81 and 82 driven and rotated by a forward and reverse motor 80 of the branch conveyance section 8, and to an idle plate 83.
The paper is transported and guided by the stacker unit and fed into the reversing transport section 9 of the stacker unit. The copy paper P2 fed into the reversing conveyance section 9 is transferred to the upper guide plate 91.
^, The receiver is inserted into the gap formed by the lower guide plate 91B. The copy paper P2 is pressed against a plurality of endless belts 94 stretched between a large diameter boob 1192 and a small diameter boob 1193 and the outer surface of the endless belt 94 so as to run on the upper surface of the lower guide plate 91B. The rollers 95^ and 95B are supported by the upper guide plate 91^ so as to rotate as a result of rotation, and are conveyed while being sandwiched between the rollers 95^ and 95B. , the lower surface of the large-diameter boob 992 is in pressure contact with the endless belt 94 and is ejected to the left from the pressure contact position of the roller 95c, which rotates as a result. Note that the tension roller 96 is an endless belt 94t.
fiifi pulley! '12.93 open

【two;! K! To prevent the copy paper P2 released from the pressure position of the knee roller 95c from following the endless belt 94,
It is installed at a position where the endless belt 94 can be sufficiently wound around the large boob IJ92. In addition, the upper guide plate 91^ has a large diameter boob 992 on its base side.
It is fixed to a shaft 910 provided parallel to the outer side of the roller 910, and can be opened from the center, making it easy to clear jams that occur between the upper and lower guide plates 91^ and 91B, and to transfer the weight of the upper guide plate 91A to the roller 95. ^, In addition to 95B, an appropriate pressure contact force is applied to the endless belt 94. Furthermore, the base side of the lower guide plate 91B is fitted onto the drive shaft 92^ of the large boob 992, so that it can be rotated about the drive shaft 92^ and opened as necessary. This makes it easy to check the storage state of copy sheets in the stacker part 10 provided at the lower part of the lower guide plate 91B and to easily deal with jams that may occur in this part. The stacker part 10 includes a stacker substrate 101 that is inclined in the opposite direction to the ejecting direction of the copy paper P2 below the reversing conveyance section 9, and a paper width that can be adjusted wide or narrow according to the size of the paper on the upper surface of the substrate 101. It includes a regulation plate 102, a regulation plate moving means 103, and a backflow fan 104. The regulating means 103 is composed of a motor, a gear, two rack members that mesh with a pinion and are movable in the width direction of the copy paper. to move. FIG. 5 shows the upper guide plate 91^ of the reversing conveyance unit 9 being rotated around the shaft 910 to open it, and then the lower guide plate 91
It is a perspective view of the input tacker unit in which B is rotated around the drive shaft 92A and opened, and each is in a substantially upright state. Two vertically long oval openings 105 are formed at the center of the stacker board 101 in the width direction, slightly above the inclined surface, and a motor-equipped ventilation fan 1.04 is installed below the openings 105. On the stacker board 101, a back wind 77 104 and a jet nozzle 10B are provided so that the copy sheets P2 of various sizes discharged from the reversing conveyance section 9 are jetted with an air flow upward from the horizontal direction in the opposite direction to the discharge direction. It is provided. The airflow ejected from the jet port 106 is ejected onto the stacker board 101 and sneaks under the falling copy paper P2, so that the copy paper P2 is placed on the air film and slides down the upper surface of the stacker board 101. . This eliminates the need to make the inclination angle of the stacker substrate 101 steep. Generally, copy sheets P2 of various sizes with different paper lengths are fed onto the surface of the stacker board 101.
Relatively small copy sheets of 4 size or less are difficult to slide down on the gently sloped surface of the stacker board 101, and do not reach the stopper below, which tends to cause paper misalignment. For this reason, the air jet opening 105 through which copy sheets of different paper lengths are forcibly slid down must have a large diameter corresponding to the lengths of the various paper sheets. However, the copy paper P2 is not on the stacker board 1.
01, the leading edge of the copy paper tends to get caught in the large diameter opening 105. For this purpose, the opening 105 is divided into two, and the two oval openings 105^ and 105B are arranged in parallel, and the opening area is approximately equal to that of one opening. Furthermore, if the peripheral surfaces of the oval openings 105^ and 105B are drawn and stepped to be slightly lower than the surface of the stacker substrate 101, the conveyance failure caused by the leading edge of the copy paper being caught can be eliminated. Next, a paper refeeding section 11 is provided near the inclined lower end of the stacker board 101 on the downstream side of copy paper conveyance. Paper refeed ff1s1] is a stopper member, a first paper feed member,
It is composed of a separation sheet feeding member, a second sheet feeding member, and the like. First, a stopper 110 having a copy paper abutting surface 110Δ is provided as a stopper member on the inclined lower end side of the stacker board 101 so that the stopper 110 can freely protrude and retract.
Copy paper P2 slides down from the slope of P1 using airflow and its own weight.
The lower tips of the two are in contact with each other. The protruding and retracting movement of the stopper 110 is caused by the rotation shaft 11 having its base end fixed.
Both side plates 1 of the stacker unit rotatably support the stacker unit 1.
Electromagnetic slide/id 11 provided on one side plate of 00
2nd prize. FIG. 6 and f:tS7 are a sectional view and a side view of the stacker unit showing the state when copy sheets are stacked by the paper refeeding section 11. In these figures, a swinging plate 113 is fixed to one end of the rotating shaft 111 so as to be swingable and connected to a plunger 112^ of an electromagnetic slide/id 112. Note that the holes at both ends of the lever 114 are for a pin 113^ which is integral with the rocking plate 113 and a planter 112A! The pins 112B are respectively engaged with the fixed bottles 112B. In addition, the electromagnetic solenoid 112 is a latching type with a built-in permanent magnet, and the plunger 1 is locked by the permanent magnet.
Hold 12^ in the specified operating position and release (unlatch)
The structure is such that it continues to maintain a predetermined operating position until it is activated. FIG. 6 shows that the above-mentioned plant 112
The swing plate 113 is held in a suction state by
FIG. 10 is a diagram showing a substantially upright position after being pulled by a lever 114. At this time, the swing plate 1
The base 11OB of the stopper 110, which is integral with the stopper 13, is held in a substantially horizontal state, and the copy paper abutting surface 110^ is held in a substantially vertical state. A fixed guide plate 115 is provided below the stopper 110 held in the horizontal state. The fixed guide plate 1
A large opening is opened near the center in the width direction of 15, and a pile 116 (lower roller C lower feed roller) 116, which is driven and rotated, and rollers 117 and 118 degrees that are driven and rotated and an arm 119 are supported. tension roller 120
Each upper part of the separating belt 121 stretched by the above-mentioned is slightly protruded from the opening of the fixed guide plate 115. On the other hand, above the fixed guide plate 115, a first paper feeding upper roller (pressing roller) 122 as shown in FIG. 1 is movably supported.
16. Both ends of the central shaft 122^ of the pressing roller 122 are supported by elongated holes 123^ at both ends of the rotating arm 123, respectively, and are slidable in the long diameter direction into the elongated holes 123.
It can be rotated freely. Further, the other end of the rotating arm 123 is fixed to a rotating shaft 125 that is rotatably supported and passes through a stem member 124 fixed between both side plates 100 of the stacker unit, and is rotated through an angle of approximately 90 degrees with the rotating shaft 125. It can be rotated freely at an angle of . Furthermore, a regulation plate (date plate) is provided at one end of the stem member 124.
126 is fixed, and its lower tip is close to a double-feed prevention roller 127 (sorting roller), which will be described later. On the other hand, a roller support member 128 that supports both shaft ends of the double-feed prevention roller 12f is fixed to a pressure position adjustment mounting plate 129. The mounting plate 129 is provided with two elongated holes, and screws 1 are provided so that the position can be adjusted relative to the rotating arm plate 130.
It is fixed by 29A. The rotating arm plate 130 is rotatable around the pongee 124A at the top of the stem member 124, and stops rotating when its flat end comes into contact with the stopper surface at the tip of the stem member 124. , the double feeding prevention roller 127 is pressed against the separation belt 121. In addition,
The roller portion 127^ of the double-feed prevention roller 127 is made of urethane rubber, as shown in Figure fIS8. This roller portion 1278 is fixed to the pongee 127D. Tsumugi 127
A ratchet holder 127B into which the one-way clutch 12c is press-fitted is fixed with an E-ring on the same axis. Each time the stopper 110 moves up and down, the ratchet holder 127B engages with the tip of a sorting and reversing plate 139 whose base is fixed to the rotating cypress 111, and intermittently rotates the double-feed prevention roller 127 to prevent uneven wear on the roller surface. To prevent. Further, since the double-feed prevention roller 127 has a one-way clutch built therein, it can rotate only toward the downstream side of conveyance in order to facilitate the removal of the copy paper P2 at the time of no-yam. Next, a rotary support shaft 131 is rotatably supported between the side plates 100, a hole in a movable side plate 132 is fitted to the rotary support shaft 131, and a movable guide plate 132 is connected to the rotary support shaft. It is rotatable around 131. The lower side 132A of the movable guide plate 132 serves as a guide plate when conveying copy paper, and the gap between it and the fixed guide plate 115 is a conveyance path. Furthermore, since the two elongated cantilever arms 132B extending to the left of the movable guide plate 132 press the ends of both wheels of the double-feed prevention roller 127 with their lower edges, in this state, the double-feed prevention roller The movable member 127 maintains a state in which the separating belt 121 is pressed from the outside by the weight of the id 132 and the like, and is not easily separated. On the conveyance downstream side of the double-feed prevention paper feeding section consisting of the separation belt 121 and the double-feed prevention roller 127, there is a drive-side lower roller 1.
41, a driven-side upper roller 142, and an idle plate 143. Figure tJ&7 is a partial side view of the stacker unit.
The link mechanism in the copy paper stack state shown in FIG. 6 is shown. FIG. 8 shows a stopper 110 driven by an electromagnetic solenoid 112. The pressure roller 122 is connected to the double feed prevention roller 12.
FIG. 7 is a perspective view of main parts showing the arrangement of FIG. As described above, the base end of the stopper 110 is fixed to the rotating shaft 111 rotatably supported between the side plates 100, and one shaft end of the rotating shaft 111 is fixed to the rotating shaft 111 rotatably supported between the side plates 100.
The swing plate 113 is fixed by protruding outward. Further, the other shaft end of the rotation shaft 111 protrudes outward from the other side plate 100 to fix the first link 133. That is, the rotation shaft 111, the stopper 110. The swing plate 113 is integrally constructed and is swingable. Further, one shaft end of the rotary support shaft 131 rotatably supported between the side plates 100 projects outward from the side plate 100, and a second link 13 is attached to the protrusion of the rotary support shaft 131.
4 is rotatably supported. Furthermore, a rotating shaft 125 that is integral with the stem member 124 is provided.
One shaft end projects outward from the side plate 100 and fixes the third link 135. A long groove 133A is bored near the tip of the first link 133, and a fixed pin 136 installed near the center of the second link 134 fits into the long groove 133A and becomes slidable. There is. Further, the fixing pin 137 installed near the tip of the third link 135 is connected to the second link 134.
It fits into a long groove 134A provided near the tip of the holder and is slidable therein. Further, one shaft end of the rotating shaft 131 projects outward from the side plate 100, and an operating lever 138 is fixed to the projecting portion. The plate 132 and the operating lever 138 are integrally rotatable. In addition, in FIG. 7, the arc with an arrow indicates the center line movement locus of each link. As described above, as shown in FIGS. 6, 7, and 8, the electromagnetic solenoid 112 holds the plunger 112A in the suction state and latches), thereby pulling the lever 114 to the left together with the plunger 112A, causing it to swing. Board 11
The tip of 3 is tilted to the left and rotates the rotating shaft 111 counterclockwise, and the stopper 110 that is integrated with this rises and is fixed to the idle plate 115, lower feed roller 116, and separation belt 12.
1 rises above each surface of the introduction part, and the i of the stopper 110
The t portion 110B is in a substantially horizontal state, with the copy paper abutting surface 110
A is held in a nearly vertical position. In the above-mentioned holding state, as shown in the linkage mechanism in FIG.
rotates clockwise and stops, so the rotating shaft 125 and the pressing roller 122 and the rotating shaft 123 that are integral with the rotating shaft 125 are flipped upward and held. In this holding state, the copy paper P2 discharged from the reversing conveyance section 9 is placed on the stacker substrate 101, descends along the inclined surface thereof, and further slides on the surface of the horizontal base 9110B of the stopper 110 and abuts it. It reaches the surface 110A and stops. Subsequent copy sheets P2 fed into the stacker portion 1o are also stacked one after another on the stacker substrate 101 and the stopper 110, and their leading edges are aligned. When a signal to start copying the back side is input, first, the planter 112A of the electromagnetic solenoid 112 protrudes and the lever 11
4 to the right, the swing plate 113 and the rotation shaft 11
1, the stopper 110 is rotated clockwise, and at the same time, the rotating arm 123 and the pressing roller 122 are rotated counterclockwise and lowered by the link mechanism, and are deposited on the base 11sllOB of the stopper 110. Press the top layer of copy paper P2. Each of the above movable members moves along a trajectory indicated by a single point 1 yen line with an arrow. In this state, preparations for refeeding the copy paper P2 are started. ! 9 and 10 are a partial sectional view and a partial side view of the stacker unit in the paper refeeding state. By retracting the stopper 110 downward, the stopper 110
The copy paper P2 stacked on the surface falls slightly and is fixed by the ID plate 115, the lower feed row 2116, and the separation belt 12.
1 to each upper surface. At the same time, the upper feed roller 122 also descends, so the copy paper P2 in this vicinity is moved by the pressure roller 122.
and the lower feed roller 116. At this time, although the rotating arm 123 is fixed, the inclination angle differs depending on the stacked thickness of the copy paper P2 placed on the side plate 115, but the central axis 122A of the pressing roller 122
23 into the elongated hole 123A, and the pressing roller 122 is always pressed.
The copy paper P2 is pressed by its own weight. When a paper refeeding signal is input in this state, the roller 118 is driven to rotate and the separation belt 121 is rotated in the direction of the arrow. At the same time, the driving rotation of the lower feed roller 116 is started. As a result, the plurality of copy sheets P2 set in a stacked state on the fixed guide plate 115 are sent out while being pinched between the rotating lower feed roller 116 and the driven rotatable upper feed roller 122, and are separated. It is placed on the upper surface of the belt 121 and conveyed slightly upward. When the leading edge of the copy paper P2 passes the lower surface of the regulation plate (date plate) 126, the regulated number of copies P2 passes through and is conveyed through the gap formed by the regulation plate 126 and the separation belt 121. ,
Copy sheets P2 exceeding this number are prevented from advancing and stand by. The plurality of copy sheets P2 that have passed through the gap between the regulation plates 126 are
The rotating separation belt 121 is pinched by the built-in one-way clutch at the position where it comes into pressure contact with the stopped double-feed prevention roller 127, and only the bottom sheet of copy paper P2 is separated and sent out by a frictional separation operation. . This sheet of copy paper P2 is continuously guided between the fixed guide plate 115 and the movable guide plate 132, and is conveyed while being pinched by the rotation of the lower roller 141 and upper roller 142 of the second paper feed unit. , 7 When the leading edge of the copy paper is detected by the sensor 144, the electromagnetic clutch 167 is turned OFF and the rotation of the first paper feed lower roller 116 and the separation belt 121 is stopped. 1
The sheets of copy paper are continuously conveyed. Furthermore, the lower paper ejection roller 14
5. The paper is pinched between the upper rollers 146 and sent to the conveying section 5. This copy paper P2 is subsequently copied on the back side of the copy paper P2 in the image forming section 3, and after being fixed in the fixing device 6, it passes through the paper discharge path a of the reverse paper discharge switching section 7 and is discharged from the machine. be discharged. FIG. 11 is a side view showing a drive system for driving and rotating each roller of the stacker unit, and FIG. 12 is a plan view thereof. Reversible motor 15 fixed inside side plate 100
A toothed pulley 152 is fixed to the drive shaft of 0, and an endless toothed belt (timing bell)
151 are meshed. The toothed belt 151 has toothed pulleys 153A, 154, 155, 156, an idler pulley 157, 158, and a tension boot 17159.
are wound around each other to form a closed loop. There are teeth 111153 on the same axis of the above toothed boob 17153A.
B is integrally molded and is fitted into the intermediate support shaft 153C implanted in the side plate 100, making it rotatable.6 A large diameter boob IJ92 is rotatably supported between the side plates 100 and inside.
In addition to the idler pulley 157, a tooth 161 having a built-in one-way clutch 162 is provided on the shaft end of the drive shaft 92A to which the drive shaft 92A is fixed. The gear 161 meshes with the gear 153B. And reversible motor 15
0 rotates forward (clockwise) and the gear 160 rotates counterclockwise, the one-way clutch 162 is connected and drive is transmitted to the drive shaft 92A, and the large diameter boo 1192 integrated therewith rotates. be done. On the other hand, when the barge pull motor 150 rotates in the reverse direction, the drive transmission by the one-way clutch 162 is cut off, and the drive shaft 92A does not rotate. Next, a toothed pulley 15 having a built-in one-way clutch 163 is attached to the shaft end of the central shaft 145A of the lower paper discharge roller 145.
4 is attached, and the power is transmitted to rotate the lower port 2145 only when the reversible motor 150 rotates in reverse, but when the reversible motor 150 rotates forward, no driving force is transmitted and the lower port 2145 remains stationary. Note that the central shaft 145A and the central shaft 14 of the upper paper ejection roller 146
Rings 164A and 164B are attached to each shaft end of 6A, and a fill spring 165 is wound between both rings, and the upper opening 2146 and the lower opening 2145 are brought into contact with each other by the spring pressure. There is. A toothed boot 91 with a built-in one-way clutch 166 is mounted on the central axis of the drive side plate roller 141 of the PIS2 paper feeding unit.
55 is attached, and when the motor 150 rotates forward, ' is stopped without transmitting power, and the motor 150 is stopped.
Power can be transmitted only when rotating counterclockwise. An electromagnetic clutch 167 connected to the toothed boot 17156 is coaxially provided at the end of the central shaft 118A of the roller 118 that drives the separation belt 121. The electromagnetic clutch 167 is activated when an ON signal is input only when the reversible motor 150 rotates in reverse, locks the toothed pulley 156, and transmits power from the toothed belt 151 to rotate the roller 118. In addition, the central shaft 118A and the central shaft 1 of the roller 117
There is a toothed boob l7118B near the center of each of 17A. 117B is fixed, and toothed bell) 168 is wound. Furthermore, the center shaft 117A and the lower feed row 211
Since the toothed belt 169 is also wound between the center shaft 116A of the 6 and the center shaft 116A of the separation belt 121, when the separation belt 121 rotates, the lower feed roller 116 is also rotated by power transmission through the toothed belts 168 and 169. be done. Note that the spindle of the idler boot 17158 is implanted in the side plate 1oo. Further, the support shaft of the tension pulley 159 is attached to the side plate 100 by a support member 160 so as to be adjustable. When the stacker unit structured as described above is used to reversely convey the copy paper P2 for backside copying,
First, the motor 150 rotates forward in response to a signal input, and the endless toothed belt 151 is rotated in the direction of the arrow in FIG. 10, thereby rotating the large-diameter boob 992 and rotating the endless belt. The copy paper P2 fed from the reversing sheet discharge switching section 7 and the branching conveyance section 8 passes through the reversing conveyance section 9 consisting of an endless belt 94 and is deposited on the stacker board 101 and the S7 pax 110. At this time, the lower paper discharge roller 145, the upper roller 146, the lower roller 141, the upper roller 142 of the second paper feed unit, and the first paper feed lower roller 2116 of the separation bell 12L are all stopped. Figure fp113 is a side view showing the drive system of the stacker unit in the paper refeeding state. When the paper refeeding signal is input, the motor 150 rotates in the opposite direction (counterclockwise rotation), and the wound toothed belt 151 rotates in the opposite direction. As a result, toothed pulleys 153A, 154, 155, 156 mesh with the toothed belt 151.
Both rotate in the opposite direction. At this time, one-way clutch 16
2 does not transmit power to the drive shaft 92A despite the rotation of the felL 161, and the large diameter boob 1792 is in a stopped state. In addition, the toothed boob 17154 that incorporates the one-way clutch 163 and the toothed boob 9155 that incorporates the one-way clutch 166 are both driven and rotated, and the lower sheet discharge roller 145 and the lower second sheet feeder 141 are driven and rotated, respectively. The upper paper ejection roller 146 and the upper @2 paper feed roller 142 that are in pressure contact with the rollers are also driven to rotate. At the same time, an ON signal is input to the electromagnetic clutch 167, and the electromagnetic clutch 167 is activated, and the toothed pulley 156 is turned on and off to transmit power from the toothed belt 151, causing the roller 118 to rotate. The rotation of roller 118 causes separation belt 121 and roller 117 to rotate, and toothed belt 168.1
69, the first paper feed lower roller 116 is also brought into a driving rotation state. In this driving state, in cooperation with the operation of the electromagnetic slide/id 112, it becomes possible to refeed the paper as shown in Figure 'PIS9. While all the sheets on the stuff car board 101 are being conveyed (
When double-sided copying is started again, the electromagnetic slide/id 112 is energized. With this, Bluntsuya 112^
is retracted by the suction force of the lever/id, moved to the left, and locked, so that the lever 114. The stopper 110 rotates counterclockwise via the swing plate] 131 rotation sleeve rotation shaft,
The copy paper abutting surface 1108 and the substrate 110B rise above the fixed γ-id plate 115 and stop. When the stopper 110 rises, the copy paper abutting surface 11
One tip of 0Δ contacts the engaging portion of the ratchet holder 127C of the double feed prevention roller 127, and feeds the ratchet holder 127C clockwise by a predetermined angle. Three links 133 connected to the rotation shaft 111 at the same time
, ring 8 consisting of 134.135! Due to this structure, the upper feed roller 122 rotates clockwise and stops at the upper retracted position. As described above, by driving one electromagnetic clutch 112,
The three operations of raising the stopper 110, flipping up the upper feed roller 122, and feeding the double feed prevention roller 127 in small pitches are performed at once, and the state before paper refeeding is restored. Next, Figure 14 is a sectional view showing a state in which the double feeding prevention portion is opened when the stacker unit is not in operation. First, the operating lever 138 provided on the outside of the side plate 100
When the operating lever 138 is tilted clockwise, the rotary support shaft 131 and the movable guide plate 132, which are fixed integrally with the operating lever 138, also rotate together and stop in a substantially upright state. Next, if you hold the roller support member 128 or the mounting plate 129 and pull it up, the rotating arm plate 130 that integrally supports these members and the double-feed prevention roller 127 will move counterclockwise around the pongee 124B of the stay member 124. rotate in the direction and come to the upper position. In this illustrated state, the double-feed prevention conveyance path is in an open state, so that removal of sham paper and inspection and repair of members such as the separation belt 121 can be easily performed at this location. In addition, it is easy to inspect and repair the double-feed prevention roller 127 and the ratchet feed member that have moved upward. Furthermore, the double feed prevention roller 12
In order to adjust the pressure contact position of separation belt 121 of No. 7, screw 1
Loosen 29A and attach the mounting plate 1 to the rotating arm plate 130.
Since the screws 129A, the mounting plate 129, etc. are located in the upper position where it is easy to work, the above adjustment operation can be performed easily, quickly, and reliably by appropriately moving the relative position of the screws 29 and tightening the screws again. Of course, the double-feed prevention roller 127 and the movable side plate can be easily restored by performing the above operations in the reverse order, and the sheet refeeding operation can be started immediately. The sheet conveyance device described above is applied to a copy paper anti-softening mechanism of a double-sided copying device to carry out suitable sheet conveyance, but the present invention is not limited thereto, and the present invention is not limited to this, but also performs sheet refeeding. A transport device, such as an automatic document feeder, can also be used. [Effects of the Invention] As explained above, in the recording sheet conveying device according to the present invention, sheets of various sizes conveyed onto the intermediate tray are transported to the edge of the air outlet provided on the sheet loading surface of the intermediate tray. Since the sheet will not get caught on the sheet, it will slide smoothly on the sheet loading surface, and the sheets will be correctly aligned and stocked at a predetermined position. As a result, when refeeding sheets, the sheets that are correctly aligned on the intermediate tray are refed in an orderly manner without causing problems such as curled edges, sideways deviation, folded edges, or jamming, and prevents misalignment of the back side copy. It has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of main parts of a tabletop copying device equipped with a recording sheet conveyance device to which the present invention is applied, FIG. 2 is a perspective view of the sheet conveyance device, and FIG. 3 is a configuration diagram of a double-sided copying device.
Figure 4 is a schematic diagram explaining the paper feed path of an automatic double-sided copying machine. Figure 5 is a perspective view of the stacker unit, Figures 6 and 7 are a sectional view and side view of the stacker unit when stacking copy sheets, and Figure PJJ8 is a perspective view showing a drive system using an electromagnetic solenoid. Figure 9 and 1
FIG. 0 is a sectional view and a side view of the stacker unit in a paper refeeding state. fjfJ11, FIG. 13, and FIG. 12 are a side view and a plan view showing the configuration and operation of the drive system of the star/two car unit. FIG. 14 is a sectional view of the stacker unit in a partially opened state. 9... Reversing conveyance section 10... Star 7 force part 1
1... Paper refeed B592... Large diameter pulley 93... Small diameter pulley 94... Endless belt 100...
- Side plate 101...Stacker board 104...Blower fan 1058, 105B...Oval opening 106...Injection port 110...Stopper 110^...Copy paper abutment surface 110B... Base 111... Rotation shaft 11
2... Electromagnetic solenoid 113... Rocking plate 115.
・・Fixed ID plate 114 ・・1st paper feed lower row 21
21... Separation belt 122... First paper feeding upper roller (suppressing roller) 124.
...Station member 127...Double feed prevention roller 129
...Mounting plate for pressure contact position adjustment 130...Rotating arm plate 132...Movable guide plate 133.134.135...Link 138...Working lever 139...Setting reversal plate 141.142 . . . 2nd paper feed roller 144 .
163.166, one-way clutch 167...
・Electromagnetic clutch

Claims (1)

[Claims] In a recording sheet conveying device that temporarily stocks recording sheets conveyed from an entrance passage on an intermediate tray and then feeds the sheets again from the intermediate tray in a direction opposite to the conveying direction, the number of sheets conveyed onto the intermediate tray is A blower opening of a blower fan that injects an air flow facing the conveying direction is provided on the sheet placement surface of the intermediate tray, and the blower opening has a plurality of vertical openings arranged in parallel, each having a long axis in the sheet conveying direction. A recording sheet conveying device characterized by having an arranged shape.