JPS63171722A - Recording sheet conveyor - Google Patents

Abstract

PURPOSE:To align each sheet accurately as well as to convey it in an accurate manner, by constituting a sheet stopping member and a regulating member as one body, while making them rockable centering on a fulcrum shaft. CONSTITUTION:Copying paper P2 discharged out of a turnover conveying part is fed on top of a stacker base 101 and mounted thereon, going down along an incline, further passing through on a fixed guide plate 120 and a separate belt 125, and it arrives at a sheet stopping member 112, thus it stops thereat. The succeeding copying paper P2 fed into a stacker part also slides on the preceding copying paper P2 on the stacker base 101 in succession, reached to the sheet stopping member 112 and stopped at this place, coming into a state of being stacked in pile, thus ends of these sheets of the copying paper P2 are turned up in line. Plural sheets of the copying paper P2 run past a clearance part of a sheet regulating plate 111 are pressed at a pressing position between the rotating separate belt 125 a double-feed preventing roller 135 in stoppage by a built-in one-way, whereby a piece of the copying paper P2 only on the lowermost layer is separated by frictional separating action and it is delivered.

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]

2. Description of the Related Art Generally, in image recording apparatuses such as electrophotographic copying machines, printing apparatuses, and the like, various techniques have been proposed for automatic double-sided recording apparatuses that can perform not only single-sided recording but also double-sided recording on a recording sheet. In conventional automatic double-sided recording devices, an image is recorded on one side of a sheet in an image processing section, the sheet is temporarily stocked in the middle, and the sheet is conveyed again and sent to the image forming section. Such an automatic sheet circulation conveyance device is disclosed in Japanese Patent Application Laid-open No. 59-82247, Japanese Patent Application Laid-Open No. 59-114227, Japanese Patent Application Laid-open No. 60-2241, and the like. Such an automatic duplex copying device changes the direction of a recording sheet (copy paper) that has been copied on one side in the copying section, conveys it to the lower part of the copying section, stores it in a part of the stacker, and sends out the sheet again to move it upward. The sheet is conveyed, changed direction, and supplied to the copying unit to copy the other side of the sheet.The direction of the sheet is changed twice between copying one side and copying the other side, so the route is It is necessary to flip the sheet once during the process. Conventional conveying devices for reversing the sheet include a system in which the sheet is placed in a separate path that branches off from the original path and then returned to the original path in a switchback manner, and an endless system that is stretched between two shafts. A method was adopted in which a belt was used and the belt was reversed at its end. In either of the above methods, the copy sheets that have been copied on one side and are once accumulated in a part of the stacker are re-fed with the trailing edge first, pass through the conveyance device and the conveyance kite, enter the image forming section again, and then are printed on the copy sheets. The toner particles formed on the photoreceptor are transferred to the other side of the photoreceptor, and the photoreceptor is further stored on a regular external tray after being transferred to the photoreceptor. The paper refeeding means of a conventional sheet conveying device includes, for example, a fixed guide plate that extends forward under the stacker and comes into sliding contact with the sheets;
A feed-out roller having a half-moon cross section that is located below the guide plate and is driven and rotated during paper re-feeding, and a pressure plate or press that is located above the roller and presses against the feed-out roller through the sheet during paper re-feed. It consists of a roller. Further, as means for preventing double feeding, a roller separation method, a belt separation method, a friction member separation method, etc. are generally used. At least one sheet with an image recorded on one side of the sheet is once deposited and stored on an intermediate tray in a part of the stacker, and the leading edge of each sheet is guided by an upper fixed guide plate and advances to form a movable sheet. It comes into contact with a stop member and stops. At this time, the press plate is retracted upward. When refeeding starts, the stopper retreats and the pressure plate descends to press the sheet, and the feed roller is driven to rotate, causing one or more sheets sandwiched between it and the pressure plate to be fed in duplicate. The sheets are sent out to the prevention means side, where sheet separation is performed, and one sheet is sent to the next conveyance means.

[Problems to be solved by the invention]

In the sheet conveyance device of the conventional automatic double-sided recording apparatus as described above, the fixed guide plate, the movable sheet stop member, the swingable pressing plate (or the suppression roller), etc. are arranged between the intermediate tray paper refeeding means. Because they are each arranged independently in a narrow and limited space, their shapes and configurations become complicated, leading to high cost F, and furthermore, workability such as assembly, adjustment, and maintenance is poor, leading to poor transportation. Furthermore, the drive mechanism for the sheet stopping member upward pressing plate (or pressing roller) is also complicated. Furthermore, the conventional fixed type
When stacking sheets on the feed plate, it is necessary to make the sheet entry side wide, but if this is done, the sheet will not be pressed and straightened when the sheet is re-feeded, so the curling of the sheet will cause the sheet to be blocked by the double-feed prevention means. This results in disadvantages such as inability to ensure reliable separation.

[Means to solve the problem]

The present invention eliminates the problems in the sheet conveying device of the conventional automatic double-sided recording apparatus as described above, and provides recording sheets that can accurately align and reliably convey sheets to be re-fed from a stacking section. The purpose of this invention is to provide a transport device. Furthermore, it is an object of the present invention to improve the reliability of sheet conveyance through a compact structure and simple operation in which the functions of stopping, guiding, and pressing the sheet are performed by a single member. The C) II conveying device of the present invention that achieves this object is a sheet conveying device that once stocks sheets conveyed from an entrance passage on an intermediate tray and conveys the sheets again from the intermediate tray. A sheet stopping member that comes into contact with the leading edge of the sheet on the tray to stop it; and a regulating member that allows the sheet to enter and guide the sheet into the sheet stopping member and presses the stocked sheet against the rotating paper feeding member when refeeding. The present invention is characterized in that the stopper member and the regulating member are integrally constructed and are swingable about a support shaft fixed to the main body of the conveying device.

【Example】

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 1 is a cross-sectional view of a main part showing the 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 VT configuration of the double-sided copying device. 4 are schematic diagrams for explaining the automatic double-sided copying function. In the figure m3, 1 is an automatic document feeder, 2 is a scanning exposure optical system, 3 is an image forming section around the photosensitive drum, 4 is a copy paper supply section (paper feed section), 5 is a copy paper transport section, and 6 is a copy paper transport section. fuser,
Reference numeral 7 designates a reversing paper switching section, 8 a branch conveying section, 9 a reversing conveying section, 10 a part of the stacker, and 11 a paper refeeding section. Note 9
．． 10.11 is a stacker unit housed in one 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 placed automatically or manually on an original platen glass is formed on copy paper P. 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 fixed copy paper P1 and discharging it outside the machine, and an id plate 71 for a lower route for double-sided copying or for discharging paper from a reverse side. The 0-tan pine haishi switching section 7, which is equipped with a branching mechanism that has the function of switching the introduction path to the paper, uses an id plate 71, an upstream roller 72 consisting of upper and lower rollers, a downstream roller 73, and a pongee 74 as fulcrums. H1 is composed of a movable branch body (7 tuppa) 75 with an inverted triangular cross section and an electromagnetic solenoid (not shown), etc., which is provided so as to be able to swing, and a paper ejection line along the upper surface of the movable branch body 75 is formed. A path a, an introduction path continuous to the guide plate 71 along one side, and a reversal paper discharge path C communicating between the guide plate 71 and the downstream roller 73 along the other side are provided, respectively. The movable branch body 75 is moved to the upstream row 27 by actuation of a drive device (not shown) such as an electromagnetic solenoid.
The right tip on the second side is vertically displaced in the vicinity of the pressure contact point of the roller rough 2 to open the introduction path and close the paper discharge path a, or vice versa. Furthermore, when the movable branch 75 opens the introduction path as described above, the lower tip of the movable branch 75 leaves a small gap for the copy paper P2 to pass through the side plate 71 on the outside of the path. They approach each other and are separated from each other by a larger distance than the side plate 1 on the outside of the reverse sheet discharge path C. Therefore, the fixed copy paper P2 passes through the right tip of the movable branch body 5, enters and descends into the introduction path, passes through the lower tip of the movable branch body 75, passes through the side plate 71, and enters the branch conveyance road 8. When the copy sheet is switched back by the reverse rotation of the forward/reverse roller 81 and conveyed in the reverse direction to the reversal sheet discharge path C, the copy sheet is prevented from flowing backward into the introduction path. The copy paper P2 that has been sent downward through the reversal sheet discharge switching section 7 is transferred to the forward/reverse rollers 81 and 82 driven and rotated by the forward/reverse motor 80 of the branch conveyance section 8 and the side 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 moved by the upper guide plate length ^
, the receiver is inserted into the gap formed by the lower guide plate 91B. The copies # and P2 are attached to a plurality of endless belts 94 stretched between the large-diameter pulley 92 and the small-diameter boolean IJ93 so as to run on the upper surface of the lower guide plate 91B, and to the outer surface of the endless belt 94. It is conveyed while being sandwiched between rollers 95^ and 95B which are pivotally supported by the upper guide plate 91^ so as to be in pressure contact and rotate as a result of rotation, and along the inverted guide curved surface old C near the right end of the upper guide plate 91^. It is inverted and released to the left from the pressure contact position of the roller 95C, which is in pressure contact with the endless belt 94 on the lower surface of the large-diameter boob IJ92 and rotates as a result. In addition, the tenten roller 96 stretches the endless belt 94 between the two boots 1792 and 93, and the roller 96
The large boot 1J92 is installed at a position that allows the endless belt 94 to be sufficiently wound around the large boot 1J92 so that the copy paper P2 discharged from the press-contact position 5c does not follow the endless belt 94. In addition, the upper guide plate 91^ has a large diameter pulley 92 on its base side.
It is fixed to a pongee 910 provided parallel to the outer side of the pongee, and can be opened from the center, making it easier to remove jams that occur between the upper and lower guide plates 91^ and 91B, and to transfer the weight of the upper guide plate 91^ to the rollers. In addition to 95^ and 95B, a suitable pressure force is applied to endless bell) 94. Furthermore, the base side of the lower side plate 9113 is
The drive shaft 92^ is fitted to the drive shaft 92^ as necessary.
It can be rotated and opened around the center. This makes it easy to check the storage state of copy sheets in the stacker part 10 provided at the bottom of the lower side 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 discharge direction of the copy paper P2 below the reversing conveyance section 9, and a paper width regulating plate that can be adjusted to be wide or narrow according to the copy paper size on the upper surface of the substrate 101. 102, a regulating plate moving means 103, and a 7T headwind 104. The regulating means 103 includes a motor, a gear, two rack members that mesh with a pinion and are movable in the width direction of the copy paper, and controls the paper width regulating plate 102 by setting the size of the copy paper. Make it move. An opening 105 is formed at the center of the stacker board 101 in the width direction, slightly above the inclined surface, and below the opening 105, an air blower 104 with a motor is attached. A blower fan 1 is installed on the stacker board 101 so that the copy sheets P2 of various sizes discharged from the reversing conveyance section 9 are blown with an air flow upward from the horizontal direction in the opposite direction to the discharge direction.
04 and an injection port 106 are provided. The injection port 1
The airflow ejected from 06 is released onto the stacker base @101 and sneaks under the falling copy paper P2,
is placed on an air film and slides down the upper surface of the stacker substrate 101. As a result, the stacker board 10
There is no need to make the inclination angle of step 1 steep. Next, a paper refeeding section 11 is provided near the lower end of the inclined needle of the stacker board 101 on the downstream side of copy paper conveyance. The refeeding section 11 includes a sheet regulating member, a first paper feeding member, a separating paper feeding member, a second paper feeding member, and the like. First, a first paper feed roller (lower feed reroller) that contacts the lower surface side of the copy paper P2 is provided on the inclined lower end side of the stacker board 101.
110, and a sheet regulating plate 111 that approaches and separates from the upper surface side of the copy paper P2. Two sheet stopping members 112 made of an elastic material are provided at one end of the sheet regulating plate 111, and these members slide down from the inclined surface of the stacker board 101 by air flow and their own weight, and the lower end of the copy paper P2 comes into contact with the sheet stopping members 112. It looks like this. This movement of the sheet stopping member 112 is performed by an electromagnetic slide/id 118 provided on one of the side plates 100 of the stacker unit. FIG. 5 is a partial sectional view of the stacker unit showing the stacking state of copy sheets by the paper refeeding section 11, and FIG. 6 is a perspective view of the sheet regulating means. In these figures, bent portions 1118 are formed at symmetrical positions on both ends of the sheet regulating plate 111, and an oil-less bearing 111B is fixed to the bent portions 111^. Left and right studs 113 planted on both side plates 100 of the stacker unit fit into the left and right oil-less bearings 111B, and the sheet regulating plate 111
It is possible to swing around 13. On the other hand, near both ends of a rotating shaft 114 that is freely rotatable between the side plates 100, one 7-mm 115 is fixed on each side. The other end of the 7-m 115 has a
115^ are respectively implanted, and the bottom surface of the sheet regulating plate 111 is pressed against the outer surface of the pin 115^ by its own weight or by being biased by a spring. Further, a swing plate 11 is provided near one end of the rotation shaft 114.
6 is fixed and can swing freely together with the rotation shaft 114. The upper end of the swing plate 116 is connected to a plunger 118^ of an electromagnetic solenoid 118 via a lever 117. Note that the holes at both ends of the lever 117 are connected to a pin 116^ that is integral with the swing plate 116 and a plant gear 118.
They are respectively engaged with pins 118B fixed at ^. Further, the electromagnetic solenoid 118 is a latching solenoid V with a built-in permanent magnet, and by locking the permanent magnet,
The planter 118^ is held in a predetermined operating position and continues to be held in the predetermined operating position until released (unlatched). FIG. 5 shows that the above-mentioned plant 118
The swing plate 116 is held in a suction state by
11 is a diagram showing a substantially upright position after being pulled by a lever 117. At this time, the arm 115 that is integral with the rotation shaft 114 rotates counterclockwise, and the pin 115 at the tip of the arm 115 rotates counterclockwise.
5^ is stopped at the raised position. The sheet regulating plate 111 that comes into contact with the pin 115 is rotated clockwise about the stud 113, and its left end surface is stopped at the raised position, and the bottom surface of the front side plate 111 is placed downward. The fixed side plate 120 and the first paper feed roller 110 are in a wide open state. On the other hand, at this time, the front end surface of the sheet stopping member 112 fixed to one end of the sheet regulating plate 111 is connected to the fixed guide plate 11.
It is in pressure contact with the top surface of 0. Furthermore, in the state shown in FIG.
1 and placed on the surface of the stacker substrate l.
The fixed guide plate 120 descends along the slope of the ot.
and the separation belt 125 and the sheet stopping member 11
2 and stop. Successive copy sheets P2 fed into the stacker part 10 are also deposited on the fluffy substrate 10 one after another.
The sheet stopping member 112 slides on the preceding copy P2 on top of P2.
When it reaches this point, it stops and is in a stacked state, and the leading edges of these copy sheets P2 are aligned. In addition, copy paper P2 that has curled, copy paper P2 that floats slightly and descends due to the air flow from the air blower 7-an 104, copy paper P2 that slides down on a large number of stacked copy papers, etc. The leading edge passes above the lower fixed side plate 120, but since the sheet regulating plate 111 is in a large open state at this time, these copy sheets P2 pass above the fixed side plate 120 on the inside of the sheet regulating plate 111. The sheet stop member 1
12 and the ends are aligned. A large opening is provided near the center of the fixed guide plate 120 in the width direction, and includes a first paper feed lower roller (lower feed roller) 110 that is driven and rotated, and a roller 1 that is driven and rotated.
21,122. and a separation belt 125 stretched by a tension roller 124 supported by an arm 123.
The upper portions of each protrude slightly from the opening of the fixed side plate 120. On the other hand, a stem member 130 is installed between both side plates 100 of the stacker unit, and a rotary member 132 is swingable with respect to a sleeve 131 protruding near the center of the stem member 130. When the flat end portion comes into contact with the stopper surface at the end of the stem member 130, the swinging is stopped. The rotating arm 132 includes a mounting plate 132 and a roller support member 1.
34 is 11! ! Possibly installed. A double-feed prevention roller (separation roller) 135 is provided near the lower end of the roller support member 134, and is in pressure contact with the outer peripheral surface of the separation belt 125 when the rotating arm 132 is at the above-mentioned stop position. . Next, a rotary support shaft 136 is rotatably supported between the both side plates 100, and a hole in a movable guide plate 137 fits into the rotary support shaft 136. It is rotatable around the center. The lower side 13 of the movable guide plate 137 serves as a guide plate when the copy paper is conveyed, and a conveyance path is formed in the gap between the movable guide plate 137 and the fixed guide plate 120. In addition, the movable ID plate 137
Since the two elongated cantilevered arms 137B extending leftward press the ends of the shafts of the double-feed prevention roller 131 with their lower edges, the double-feed prevention roller 131 is not movable in this state. The separation belt 125 is kept pressed from the outside by its own weight, such as 137, and is not easily separated. On the conveyance downstream side of the double-feed prevention paper feeding section consisting of the separation belt 125 and the double-feed prevention roller 131, there is a drive-side lower roller 1.
41, a driven-side upper roller 142, an idle plate 143.7, and an automatic sensor 144. Next, when a signal to start backside copying is input, the planter 118^ of the electromagnetic lens 118 first projects and moves the lever 11 to the right, so that the stopper is moved through the swing plate 116 and the rotation shaft 114. 115 is rotated clockwise, and the pin 115^ is lowered. This causes the pin 115^
The sheet regulating member 111 that is in constant pressure contact with the stud 113
Rotate counterclockwise around the guide Y surface 115C.
is lowered, and the fixed guide plate 120 goes up and the first paper feed roller 1
It is pressed against the top layer of the copy paper P2 piled up on the sheet P10. At the same time, the sheet stopping member 112 also rotates counterclockwise, so that its leading end releases pressure contact with the separation belt 125 and separates from it, allowing the copy paper P2 to pass. Each of the movable members described above moves in a trajectory shown by a dashed line with an arrow. In this state, preparations for refeeding the copy paper P2 are started. The tjST diagram is a partial cross-sectional view of the stacker unit in a paper refeeding state. When a paper refeeding signal is input in this state, the roller 122 is driven to rotate and the separation belt 125 is rotated in the direction of the arrow. At the same time, the driving rotation of the lower feed roller 110 is also started. As a result, the plurality of copy sheets P2 set in a stacked state on the fixed guide plate 120 are moved by the rotating lower feed roller 110 and the sheet regulating plate 11 which presses from above.
1 and sent out, placed on the upper surface of the separation belt 125 and conveyed slightly upward. A plurality of copy sheets P passing through the gap between the sheet regulating plates 111
2 is pinched at the position where the rotating separation belt 125 and the double-feed prevention roller 131 in the stopped state are in pressure contact with each other by the built-in one-way clutch, and only the bottom sheet of copy paper P2 is separated by a frictional separation action. and sent out. This one sheet of copy paper P2 is continuously guided between the fixed guide plate 120 and the movable guide plate 137, and is conveyed while being pinched by the pressure rotation of the lower roller 141 and the upper roller 142 of the 12 paper feed unit. When the leading edge of the copy paper is detected by the sensor 144, the rotation of the lower Pt51 paper feed roller 110 and the separation belt 125 is stopped, so that the single copy paper is continuously transported by the second paper feed rollers 141 and 142. . Further, the paper is pinched between a lower paper discharge roller 145 and an upper paper roller 146 and sent to the conveying section 5. This copy paper P
2, the image forming section 3 continues to copy the back side of the copy paper P2, and the fixing device 6 transfers the image to the fixing path J! +! And now,
The paper passes through the paper discharge path a of the anti-wandering cod switching section 7 and is discharged to the outside of the machine. The sheet conveyance device described above is applied to a copy paper reversing mechanism of a double-sided copying device to carry out suitable paper conveyance, but the present invention is not limited thereto, and the present invention is not limited to this, and the present invention is not limited to this, and the present invention is not limited to this. Devices such as automatic document feeders are also available.

【Effect of the invention】

As described above, the recording sheet conveying device according to the present invention can be used in a limited narrow space between a part of the stuffer for refeeding sheets once stocked in an intermediate tray and a paper refeeding section. Guides, stacks, and aligns copy paper through simple movements of one member. It is possible to perform complex multi-functions such as stopping and refeeding. In particular, after stacking is completed, this is done using a sheet regulating plate that also serves as a guide and to suppress the copy paper, so it is possible to correct the curl of the copy paper to some extent, and it is effective in preventing skewing and paper feeding errors when refeeding paper. There is. In addition, it can be operated by a relatively simple drive source such as a solenoid, so the structure is simple.
It has excellent effects such as being compact, operating stably, and reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a double-sided copying device equipped with a recording sheet conveying device to which the present invention is applied, FIG. 2 is a perspective view of the sheet conveying device of the double-sided copying device, and FIG. 3 is a configuration of the double-sided copying device. 4 is a schematic diagram illustrating the paper feeding path of an automatic double-sided copying machine, FIG. 5 is a sectional view of the stacker unit 7) when copy sheets are stacked, and FIG. 6 is a perspective view showing the drive system using an electromagnetic solenoid. It is. FIG. 7 is a sectional view of the stacker unit in a paper refeeding state. 9... Reversing conveyance section 10... Stacker part 1
1...Refeed #, part 92...Large diameter pulley 9
3...Small diameter pulley 94...Endless belt 100...Side plate 101...Stacker board 104...Air blower 7 amp 110...First
Paper feed roller 111...Sheet regulation plate 112...
Seat stop member 114... rotating wheel 115...
...Arm 116...Swing plate 117...
Lever 118... Electromagnetic solenoid 120... Fixed guide plate 125... Separation belt 135... Double feed prevention roller 137... Movable guide plate 141, 142... Second paper feed roller 144... 7 oto sensor

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, the recording sheet conveying device contacts the leading end of the sheet on the intermediate tray and stops during the stocking. It has a sheet stopping member, and a regulating member that allows the sheet to enter and guide the sheet into the sheet stopping member and presses the stocked sheet against the paper feeding member that moves once when refeeding, and the sheet stopping member and the regulating member. What is claimed is: 1. A recording sheet conveying device characterized in that the recording sheet conveying device is integrally constructed with a member and is swingable about a support shaft fixed to a main body of the conveying device.