JPS61183040A - Automatic sheet turn over device - Google Patents

Abstract

PURPOSE:To prevent jamming of papers and to deliver them securely in an electronic picture copying machine and the like, by furnishing a forward end stopper to contact the forward ends of the papers, whose center portion is taller than the both sides and the upper end is bent to the direction of the movement. CONSTITUTION:Sheets copied on one side and loaded in a stack and carrier member 3 are pushed up by a stopper 23 and their forward ends move on a press up plate 32 which goes up just before the sheets contact a forward end stopper 33, and refed to the copier, sheet by sheet, by an intermittent rotation of a feeding belt 35 and the action of a duplex feeding preventive roller 38. The forward end stopper 33 is higher at the center portion 33d than at the both sides 33a, and the upper portions 33b and 33e are bent in the forward direction of the paper feeding. Therefore, the feeding papers are carried to cross over the forward end stopper 33 smoothly with their upside center attached to the feeding belt 35 and both sides dropped down, being guided by the upper portion 33b to feed securely without jamming and the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] Used in electrophotographic copying devices, printing devices, etc., in which paper that has been treated on one side is reversed and then used again in the electrophotographic copying device,
This invention relates to an automatic paper reversing device for sending the paper to a printing device or the like to process the other side.

[Prior art]

- i is an automatic paper reversing device used in electrophotographic copying machines, printing devices, etc., which temporarily stores paper that has been processed on one side and sends it out again; After taking a predetermined number of sheets of paper, the paper is fed out with the trailing edge first, and then sent out again to an electrophotographic copying device, printing device, etc. via a paper feeder. is shown in Japanese Patent Laid-Open No. 59-82247 and Japanese Patent Laid-Open No. 59-114227, etc., but in any of these, the paper that has been treated on one side is turned over and the stamper is used. By arranging the stacker in an inclined manner, the sheets are stacked one after another with the paper traveling direction diagonally downward and the leading edge of the sheets abutting the stopper.

However, when such stacking is performed, if the paper itself is charged with static electricity during processing on one side, smooth conveyance will be hindered, and the gap between the paper and the paper below it will increase until it is stacked. No matter what part of the paper is transported, it will be stacked on top of the lower paper after being conveyed in a more or less constant state, and therefore the air located between the lower paper and the lower paper will cause an obstruction during stacking. This prevents smooth stacking, and if there is static electricity as described above, it will be attracted to nearby components, which may cause jams and prevent smooth stacking. It had the disadvantage that it could not be done.

[Purpose of the invention]

This invention eliminates the drawbacks of the conventional paper as described above, and when an inverted sheet of paper is stored and then moved to a predetermined position and sent out, both ends of the sheet of paper to be sent out become lower as they go outward. Since the top surface is bent at a predetermined angle 11, it is possible to reliably support both sides of the paper and ensure that the paper is fed out without jamming or the like. An object of the present invention is to provide an automatic paper reversing device.

[Structure of the invention]

The present invention includes a conveying and reversing section that receives a sheet of paper processed on one side, sends it forward via a conveyor belt, then reverses it and conveys it backwards, and a stopper that comes into contact with the leading edge of the sheet that has been reversed. a stacking and moving unit that stores the sheets that have been sequentially reversed and conveyed and moves the sheets forward by a stopper to a predetermined position; an automatic sheet reversing device comprising a leading edge stopper for pushing up the leading edge of the sheet, and a feeding section for feeding out the sheets sequentially over the leading edge stopper by means of a feed belt cooperating with a push-up plate for pushing up the leading edge of the sheet; The center portion of the paper sheet and the paper sheet are higher than both end portions, and the upper portion thereof is bent forward in the paper moving direction.

[Embodiments of the invention]

Embodiments of the invention shown in the drawings will be described below.

The drawings show an automatic sheet reversing device according to the invention, which automatic sheet reversing device is located below an electrophotographic reproduction machine.

This automatic sheet reversing device includes a discharge switching section 1, a conveyance reversing section 2, a stacking/moving section 3, and a supply section 4.

The ejection switching section 1 is a fixing device 1 of an electrophotographic copying apparatus.
A flapper that can be switched between a discharge position in which the paper that has been discharged from 00 and which has been processed on one side is sent out to the outside via the discharge roller 5, and a position in which the paper is directed to the conveyance reversing unit 2. 6, and this flapper 6 is operated by a solenoid 7.

The conveyor reversing unit 2 has a plurality of conveyor belts 10 stretched between three shafts 9a, 9b, 90 installed between both sides 8.8 of the chassis, and a central one 9b of the shafts. At the end of the chassis, there is a sliding plate 12 which is swingable in the vertical direction about its axis 9b and which is biased upward by a spring 11 provided between it and one of the chassis side plates 8. A gear 14 with a pulley 13 is rotatably provided at the tip of the swing plate 12, and a gear 14 for transmitting rotational force is provided between the pulley 13 and a pulley 15 fixed to the end of the shaft 9b. A belt 16 is stretched, and the pulley 13
The attached gear 14 is a conveyor belt 101 of an electrophotographic copying device.
By meshing with the gear 103 provided on one of the shafts 102, rotational force is transmitted to the three shafts 9a, 9b.
, 9C, each conveyor belt 10 is movable.

Further, the conveyor reversing section 2 is provided with a cover plate 17 that covers the plurality of conveyor belts 10 located between the three axes 9a, 9b, 90.
, 9c are provided with rollers 18 that are rotatable relative to the cover plate 17, and each roller 18 has an upper surface of the conveyor belt 1o;
The cover plate 17 is supported by this contact, and a paper conveyance path 19 is formed between the conveyor belt IO and the cover plate 17.

Further, since a roller 18A provided on the cover plate 17 is located on the upper surface of the portion of the conveyor heel 1-10 located above the shaft 9a located at the front in the conveyance direction of the paper, the conveyed paper is reversely guided. Since it is pressed against the conveyor belt 10 immediately before it is reversed between the plate 2° and the conveyor belt 10, it can smoothly enter the reversing guide plate 20.

In the stack/movement unit 3, a hole 22 extending in the front-rear direction is formed in the center of the chassis bottom plate 21, and the lower part is located in the hole 22, and the upper part extends sequentially forward from the bottom to the top. has a protruding front surface, and
A stopper 23 whose upper portion is located above the upper surface of the conveyor belt lo of the conveyor reversing section 2 is provided, and the stopper 23
2 so as to be movable in the front and back direction.

The details of this stopper 23 are shown in FIG. The front end of the bottom portion 24 located above is sloped to form a sloped portion 24b.

Further, the rear end of the bottom portion 24 stands up vertically, and its upper portion protrudes forward, and the front portion of this protruding portion 24c becomes an inclined surface portion 24d that slopes backward, and a central portion of the lower end of this inclined surface portion 24d. A tongue portion 25 made of a flexible member is provided continuous with the inclined surface portion 24d.

In addition, side plates 26 are provided in the left and right direction of the chassis bottom plate portion 21.
．． 26 are provided respectively, and these both side plates 26.26
are fixed to racks 28 and 28 extending in the left and right direction through holes 27 and 27, respectively, and
The two racks 28.28 are located between the two racks 28.28, and mesh with a pinion 29 provided on the lower surface of the chassis bottom plate 21. When the pinion 29 rotates, both side plates 26. 26 are arranged to move closer or further apart from each other.

The supply section 4 is located within a rectangular notch 30 formed in the center of the front part of the stack/movement section 3, and its rear end is pivoted around a shaft 31 and swings in the vertical direction. A movable push-up plate 32 is provided, and this push-up plate 32
A front end stopper 33 is provided adjacent to the front end of the push-up plate 32, and a pair of rollers 3 is provided above the push-up plate 32.
A supply belt 35 stretched between 4a and 34b is located,
Of these rollers 34a and 34b, rollers 37 and 37 are provided at both ends of the shaft 36 of the roller 34b on the side of the temporary push-up 32, respectively.

The details of the front end stopper 33 are shown in FIG. 5, and the upper bent portions 33b of both end portions 33a become higher as they go inward, and the bending angle of the bent portions with respect to the vertical becomes progressively larger. and
Further, a central portion 33a that is continuous with both ends 33a via a notch 33c is higher than both ends, and its upper end is bent.

In addition, the supply belt 35 in front of the front end stopper 33
A double-feed prevention roller 38 is pressed from below to the portion shown in FIG. The rotating member 81 always pushes upward through a biasing member (not shown), that is, pushes the push-up plate 32 upward.
It is biased in the direction of increasing.

Further, a guide plate 82 is provided in front of the supply belt 35 to direct the paper upward.

Next, the drive system of each of the above-mentioned parts will be explained. Switching of the flapper 6 in the discharge switching part 1 is performed by the solenoid 7 as described above, and the conveyance reversing part 2
The conveyor belt 10 stretched between the three wooden shafts 9a, 9b, 90 is driven by the rotation of the conveyor belt 101 of the electrophotographic copying apparatus, and the gear 14 that meshes with the gear 103. It is transmitted to the central shaft 9b through the pulley 13 and belt 16 that rotate together, the pulley 15 rotated by the belt 16, and is further transmitted to the other shafts 9a and 9C in the front and rear direction through each conveyor belt 10. The gear 39 provided on the rear shaft 9C is further transmitted to the pulley 39 and the belt 40 via the gear train 38.
The discharge roller 5 of the discharge switching section 1 is rotated through the feed roller 5, and a supply roller 76 is provided on the shaft 78 of one gear 77 of the gear train 38.

In addition, for driving the stopper 23 and both side plates 26 and 26 of the stack-cum-moving section 3, first, the drive source 4
1 rotates, the gear 46 rotates via the worm gear 42, another gear 43, and further via the pulley 44 and belt 45.

The main part of this drive transmission is shown in FIG. 6, and the shaft 47 of the gear 46 is swingably provided with a rocking plate 48 having a bifurcated tip. The rocking plate 48 is biased clockwise in FIGS. 2 and 6 by a spring 49, and a solenoid 50 biases the spring 4
The two-pronged portion 48a of the rocking plate 48 has gears 51 and 52 that engage with the gear 46, respectively. Both gears 51 and 52 have pulleys 53 on their sides.
．． 54 are respectively fixed and can be separately meshed into engagement with gears 56, 57 which are rotatably mounted on an axle 55 projecting from the side 8 of the chassis.

Therefore, in the state shown in FIGS. 2 and 6 in which the blade 50 is inactive, it cannot be driven. When the gear 1141 is driven, the gear 57 rotates, and the pulley 54 rotates at the same time, so that the chassis bottom plate 2 is
The pulley 59, which is coaxial with the two pinions provided in the
The rack 28.28, which is in meshing engagement with the rack 28.28, and the side plates 26.26, which are fixed thereto, move toward or away from each other along the holes 27.27.

The moving distance of this rack 28.28 is
The protrusion 28a protruding from the tip 8 comes into contact with the actuator of the two microsinks 0.60, and is moved according to the predetermined paper size by the signals emitted by the two microswins 0.60. The distance between the side plates 26 and 26 is set to an appropriate distance depending on the width of the paper size.

In addition, when the solenoid 50 is activated, the above)
The moving plate 48 swings in the counterclockwise direction in FIGS. 2 and 6 against the biasing force of the spring 49, so that one of the gears 5
1, the meshing engagement between it and the gear 57 is released, and the other gear 52 comes into meshing engagement with the gear 56.

This gear 56 is coaxial with the gear 57 and is rotatable, and a pulley 53 is integrally fixed to the side surface of the gear 56. This pulley 53 and the stopper 23 are connected by a wire 61, and this wire 61 is By winding and extending the pulley 63 of the shaft of the disk 62, which has a plurality of holes bored in the outer peripheral edge, the disk 62 is rotated when moving the stopper. The driving source 4
1 is controlled so that the stopper 23 is positioned a predetermined distance behind the edge of the paper depending on the length of the paper size used.

On the other hand, as shown in FIG. 7, the gear 65 that meshes with the stopper moving gear 56 rotated by the other gear 52 meshes with the gear 56 only in a part of its periphery. An engaging tooth portion 65a is formed, and
Since the two springs 66 and 66 bias the tooth portion 65a in the direction in which the tooth portion 65a meshes with each other, the gear 56 and the tooth portion 65a mesh with each other and rotate together only at the initial stage of rotation of the gear 56. It looks like this.

A lever 67 is provided at the end of the shaft 3I to which the push-up temporary 32 of the supply section 4 is pivotally attached, and this lever 67 is biased clockwise by a spring 68. By engaging with a protrusion 69a of another lever 69 provided so as to be able to vibrate in the vertical direction, the push-up plate 32 is held in a vertical state, that is, in a horizontal state.

Therefore, at the beginning of the rotation of the other gear 52, the pulley 53
As the stopper 23 moves forward via the wire 61, the gear 56.65 also rotates in the direction of the arrow, and when the pin 70 provided on the gear 65 comes into contact with the lever 69 and swings it upward, the lock is secured. When the lever 67 comes off, the spring 68
rotates clockwise about the shaft 31.

Therefore, the push-up plate 32 is moved upward by the spring 68, and its front end comes into contact with the lower surface of the supply belt 35.

Further, when the drive source 41 rotates in the opposite direction to bring the stopper 23 into the initial standby state, the gear 65 rotates in the opposite direction, and in the middle of the rotation, the arcuate protrusion 71 moves the lever 67 counterclockwise. That is, as the push-up plate 32 is swung downward, the pin 70 is removed from the lever 69, so that the lever 67 is caught on the protrusion 69a of the lever 69, and the lever 67 is held in the state shown in FIG. The push-up plate 32 is held in a horizontal state, and in this case, even if the paper size is different and the initial standby position of the stopper 23 is changed, the operation will be the same.

Further, a drive source 72 for rotating the supply belt 35 of the supply section 4 is provided on the side part 8 of the chassis, and drives a shaft 75 and a roller 34a integrally fixed thereto via a worm gear 73 and a gear 74. It is something that is rotated.

In addition, 104 is a registration roller, 105 is an image carrier, 1
06 is a fixing roller, and 107 is a transfer/separation pole.

Next, the operation of the above will be explained.

First, when the automatic paper reversing device according to the present invention is moved from the right to the left in FIGS. Since the state is in an upright state compared to the state shown in the figure, when the movement is completed, the gear 14 at the upper end meshes with the gear 103 provided on one roller of the conveyor belt lO1 of the electrophotographic copying device, hence the conveyor bell)
When 101 moves, the driving force applied to it is applied to pulley 1.
3, the rotation direction is transmitted to the shaft 9b via the bell) 16 and the pulley 15, and both gears 103 and 14 are rotated by the spring I.
Since it is in the direction of biting by the IO biasing force, a reliable meshing engagement is achieved.

In this case, since the conveyance direction of the conveyance belt 101 of the electrophotographic copying device located at the upper part is in the direction of the arrow, the conveyance belt 10 of the conveyance reversing section 2 is rotated in the direction of the arrow.

Then, when the upper electrophotographic copying device is started, the conveyor belt 10 of the conveyor reversing section 2 starts moving in the direction of the arrow as described above.

After this, for example, when both copying modes are set to perform double-sided copying, the solenoid 7 of the ejection switching section 1 is activated to move the flapper 6 as shown by the solid line in FIG. Due to this, the automatic paper reversing device is in a state of turmoil.

Also, depending on the paper size set on the operation panel of the electrophotographic copying machine, both side plates 26 and 26 and the stopper 23
moves to an appropriate position and waits, that is,
First, when the drive tA41 is driven with the solenoid 50 inactive, one gear 51 of the bifurcated rocking plate 48 rotates via the belt 45.
Since the gear 57 and the pulley 54 that are in meshing engagement with each other rotate, and the pinion 29 rotates via the wire 58,
Both side plates 26.26 move according to the set paper size via the levers 28.28, and this movement is stopped at the appropriate position by the rONJ and rOFFJ signals of the two microswitches 60.60. I'm familiar with it.

Furthermore, when the solenoid 50 operates, the driving force of the drive source 41 is transmitted to the gear 56 and the pulley 53 via the belt 45, so the stopper 23 is also moved via the wire 61, and the amount of movement is A disk 62 on which a wire 61 is wound around the pulley 63 on the shaft when the pulley 53 rotates.
Moreover, since the holes in the disc 62 are counted by the detection member 64, the stopper 23 is stopped at an appropriate position.

In the standby state as described above, the image carrier 105
When the paper, which has received the image formed on it via the transfer/separation pole 107, is transported by the transport belt +01 and passes through the fixing device, the flapper 6 of the discharge switching unit 76, the paper then advances within the transport path 19 formed between the transport belt 10 and the cover plate 17, and when the leading edge of the paper reaches the roller 18A, the paper is transported downward by the transport belt 10. Since the sheet is pressed by IO and reversal starts immediately after being pressed, the sheet smoothly passes through the conveyance path 80 between the reversal guide plate 20 and the conveyor belt IO and reaches the stacker which is the upper surface of the chassis bottom plate 21. It is something that is stored.

For example, even if the paper is conveyed while being attached to the conveyor belt 10 due to static electricity or the like, the upper end of the stopper 23 is located above the lower surface of the conveyor belt 10, and the stopper 23 is located at the inclined surface portion 24d. As shown in FIG. 4(b), even if the paper is curved during transfer/separation by the electrophotographic copying device, the leading edge descends along the inclined surface 24d and the tongue portion After bending 25, it is located between the tongue part 25 and the bottom part 24, so that it is reliably located in the chassis bottom part 21, that is, in the stacker.

After the paper with one side copied in this way is stored in the stacker, when sending out the paper,
The electrophotographic copying apparatus issues a signal indicating that copying of one side has been completed, and this signal activates the solenoid 50, activates the drive 'rA41, and also activates the drive source 72 of the supply section 4.

Therefore, the other gear 52 of the two-pronged rocking plate rotates, and the gear 56 and pulley 53 that mesh with this gear 52 also rotate, and also mesh with the gear 56. The gear 65 having the teeth 65a also starts rotating.

Therefore, the stopper 23 moves forward via the wire 61, and the bundle of sheets whose ends are located between the bottom 24 and the top 24c also moves forward.

Immediately before the leading end of the stack of paper contacts the front end stopper 33 while being positioned on the upper surface of the push-up plate 32, the drive source 41 stops, the stopper 23 stops, and the pin 7° of the gear 65 Push up the lever 69, thus
Since the lever 67 is rotated clockwise by the spring 68, the push-up plate 32 fixed to the shaft 31 of the lever 67
rises and presses the upper surface of the uppermost one of the upper stacks of sheets against the lower surface of the supply belt 35.

On the other hand, since the drive source 72 of the supply belt 35 rotates for the time required to convey one sheet of paper, the topmost sheet of paper is supplied along the guide plate 36 to the electrophotographic copying device located above. .

When conveyed by the supply belt 35, only the central portion of the leading edge of the paper bundle is lifted by the push-up plate 32, and therefore both sides are conveyed by the supply belt 35 in a hanging state. The front end stopper 3
3, both sides of the paper become higher as they move inward, so the part where the bottom surface of the paper slides rises, and the folding angle increases as it moves inward, so the size of the paper increases. It is possible to maintain a substantially constant hanging state regardless of the condition.

Then, the paper fed out along the guide plate 36 by the supply belt 35 is conveyed via the registration roller 104 and when a copy is made on the other side, the flapper 6 is activated via the solenoid 7 as shown in FIG. Since the state is shown by the chain line, the paper that has been copied on both sides is ejected outward.In this way, when the other side is sequentially copied and the paper in the stacker runs out, In this case, the stopper 23 is at the initial standby position, and the push-up plate 32 is also held in a horizontal state.

Further, when the push-up plate 32 swings vertically each time paper is sent out, the rotating member 81 whose rotation is regulated by the push-up plate 32 also pivots in the vertical direction. However, since this rotating member 81 is connected to the shaft 39 of the double-feed prevention roller 38 via the one-way clutch 40, the double-feed prevention roller 38 is rotated by a predetermined angle when rotating, thereby preventing double feed. Since the circumferential surface of the roller 38 that comes into contact with the supply belt 35 is changed little by little, the circumferential surface of the double-feed prevention roller 38 is prevented from being worn out.

〔Effect of the invention〕

This invention is constructed as described above, and in particular, the top and bottom are compressed to the maximum extent, so that the received sheets are inverted, stacked securely, and placed on standby, and then moved to a predetermined position to be securely stacked. It can be ejected, and it can also be built into a small electrophotographic copying device, etc. However, when feeding the paper, the sag on both sides of the paper is guided by the top surface of the front end stopper, and the paper is fed out. However, since the drooping portions of both ends of the paper are supported by a predetermined middle portion formed on the top surface of the front end stopper, they are smoothly fed out without being caught by the front end stopper, and the portions of a predetermined width are The height increases as you go inward, so no matter what size paper you use, the hanging parts on both sides of the paper are supported and fed out, ensuring reliable feeding and preventing jams. It has excellent effects such as no problems.

[Brief explanation of the drawing]

The drawings show an automatic sheet reversing device according to the present invention, in which FIG. 1 is an overall plan view, FIG. 2 is a side view, FIG. 3 is a vertical side view, and FIGS. 4a and 4b are schematic diagrams showing a stopper. Figures 5a, 5b, 5c, and 5d are schematic diagrams showing the front end stopper, Figure 6 is a schematic diagram showing the drive switching part, and Figure 7 is a mechanism for raising and lowering the push-up plate. Schematic diagram, FIG. 8 is a schematic diagram showing a mechanism for rotating the double-feed prevention roller. 1... Discharge switching section 2... Conveyance reversing section 3... Stack and moving section 4... Supply section 6... Flapper 7. 50...Solenoids 9a, 9b, 9c--Shaft 10...Transport belt 12...Swing plate 17...Cover plate 18. 18A...Roller 19.79.80...Conveyance path 23...Stopper 24d...Slanted surface portion 25...Tongue portion 32... ...Pushing plate 33...Front end stopper 33b...Bending portion 35...Supply belt 38...Double feed prevention roller 40.45... ...Belt 41.72...Drive source 48...2 or spread plate 67.69...Lever Fig. 4Q Fig. 4b Fig. 5Q

Claims (1)

[Claims] It has a conveying and reversing unit that receives the paper that has been processed on one side, sends it forward via a conveyance belt, then reverses and conveys it backward, and a stopper that comes into contact with the leading end of the reversed paper, A stacking and moving unit that stores sheets that have been sequentially reversed and conveyed and moves the sheets forward to a predetermined position using a stopper, and a front end stopper that can come into contact with the leading end of the sheet stopped at the predetermined position. and a feed section that sequentially sends out the sheets over the front end stopper by means of a feed belt that cooperates with a push-up plate that pushes up the front end of the sheet, wherein the front end stopper has a central portion that is connected to both ends of the sheet. An automatic paper reversing device characterized in that the upper part is bent forward in the direction of paper movement.