JPS61183028A - Automatic form reversing device - Google Patents

Abstract

PURPOSE:To enable a form to be positively housed in by configurating a device in such a manner that a stopper in a stacker unit combined with a transfer unit is positioned underneath a place between double rows of conveyor belts in a transfer unit combined with a rotation unit, and the upper section of the stopper is positioned at a placed higher than the lower surface of the conveyor belt in an electronicphotographic copying machine and the like. CONSTITUTION:Under the condition where both side plates 26 of a stack unit combined with a transfer unit 3 and a stopper 23 are positioned in accordance with the form size, a form, a single side of which is printed by an image holding unit 105, is directed downward by a flapper 6, and is housed in through a reversion guide plate 20 by means of double row transfer conveyors 10 in a conveyor section 2 combined with a reversing unit. This stopper 23 is positioned underneath a space between the double row transfer conveyors 10, but the upper end of the stopper is positioned at a place higher than the lower surface of the conveyors 10. This enables the form to be positively housed in. And the stopper 23 is moved forward so as to move the bandle of forms up to a push-up plate 32. Then, the push-up plate 32 is raised up allowing the form to come in contact with the lower surface of the feed belt 35. The allows the form to be positively fed one after another.

Description

[Detailed Description of the Invention] [Graduation Field of Application] This invention relates to an automatic paper reversing device, which is particularly used in electrophotographic copying devices, printing devices, etc. This invention relates to an automatic sheet reversing device for feeding the sheet to the electrophotographic copying machine, printing device, etc. and having the other side processed.

[Prior art]

Generally, automatic paper reversing devices used in electrophotographic copying devices, printing devices, etc., temporarily store paper that has been processed on one side and send it out again. After a predetermined number of scattered sheets are taken, they are sent out with the trailing edge first, and then sent out again to an electrophotographic copying device, printing device, etc. via a paper feeder. Apparatuses are disclosed 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 processed on one side is reversed. When storing the sheets in the stacker, by arranging the stacker at an angle, the sheets are stacked one after another with the advancing direction of the sheets 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 ones as described above, and when the paper is conveyed and then reversed and stored in a predetermined position, the paper can be reliably guided to the storage position, and then, An object of the present invention is to provide an automatic paper reversing device capable of sequentially sending out stored paper sheets.

[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 stack/transfer unit that stores the sheets of paper that have been sequentially reversed and conveyed, and moves the sheets forward using a stopper to a predetermined position; The paper feeder has a configuration including a push-up plate located at the front end of the sheet to push up the front end of the paper, and a supply section having a supply belt that contacts the upper surface of the pushed-up paper and sequentially feeds the paper.

[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 fi of an electrophotographic copying apparatus.
It is possible to switch between a discharge position in which the paper that has been discharged from the loop (one side of which has been processed) is sent out to the outside through the discharge port 5, and a position in which the paper is directed to the transport reversing unit 2. It has a flapper 6 which is operated by a solenoid 7.

The conveyor reversing unit 2 has a plurality of conveyor belts IO 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 swing 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 boot 1J13 is rotatably provided at the tip of this swing plate 12.
and a pulley 15 fixed to the end of the shaft 9b, a belt 16 for transmitting rotational force is stretched between the
The gear 14 with 713 meshes with the gear 103 provided on one shaft 102 of the conveyor belt 101 of the electrophotographic copying device, thereby transmitting rotational force 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 is in contact with the upper surface of the conveyor belt 10. In addition to supporting the cover plate 17, a paper conveyance path 19 is formed between the conveyance belt 10 and the cover plate 17.

Further, since the roller 18A provided on the cover plate 17 is located on the upper surface of the portion of the conveyor belt 10 located above the shaft 9a located forward in the paper conveyance direction, the conveyed paper is transferred to the reversing guide plate 20. Since the sheet is pressed against the conveyor belt 1-10 immediately before being reversed between the sheet and the conveyor belt 10, the sheet enters the reversing guide plate 20 smoothly.

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 10 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 which is sloped continuously with the slope 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 are located between the two ranks 28.28 and mesh with a pinion 29 provided on the lower surface of the chassis bottom plate 21, and when the pinion 29 rotates, the side plates 28 .26 may be moved 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 bar 33 is provided adjacent to the front end side 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 the rollers 34a and 34b, the one 34b on the push-up plate 32 side has rollers 37 and 37 provided at both ends of the shaft 36, 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 95 in front of the front end stopper 33
The song benefit 7.7L ten T★iso＼Musen;≠11 + Trouji 3
8 is crimped, and the shaft 39 of this double feed prevention roller 38 has an eighth
As shown in the figure, the rotating member 8
1 is provided, and this rotating member 81 is always urged upward, that is, in the direction of pushing up the push-up plate 32, via a biasing member (not shown).

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
(transfer bell stretched between three shafts 9a, 9b, 90)
10 drives the rotation of the conveyor belt 101 of the electrophotographic copying apparatus by a gear 14 that meshes with the gear 103, a pulley 13 that rotates together with the gear 14, a belt 16, and a pulley 15 that is rotated by the belt 16. The transmission is transmitted to the central shaft 9b through the conveyor belt 10, and is further transmitted to the other shafts 9a and 9C in the front and rear directions through each conveyor bell) 10, and the gear 39 provided on the rear shaft 9C is a gear. Via row 38, furthermore, pulley 39 and belt 40
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 3.

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 wire throat 50 is inactive, the gear 57 rotates when the drive source 41 is driven, and the pulley 54 rotates at the same time, so that the wire 58 is rotated. A pulley 59 coaxial with the binion 29 provided on the chassis bottom plate 21 is rotated through the rack 28 and the rack 28 is engaged with the binion 29. The plates 26.26 are adapted to move towards or away from each other along the holes 27.27.

And the distance traveled by this rack 28 on 2nd day is rank 2
The protrusion 28a protruding from the side plate 8 comes into contact with the actuators of the two microswitches 60, 60, and moves according to the predetermined paper size in response to the signals generated by the two microswitches 60, 60. 26 is set to be an appropriate distance depending on the width of the paper size.

Further, when the solenoid 50 is activated, the swing plate 48 resists the biasing force of the spring 49 as shown in FIGS. 2 and 6.
By swinging counterclockwise in the figure, one gear 51
The meshing engagement between the gear 57 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 Multiple holes are drilled in the outer periphery of the candy.
Since the disk 62 is extended by one light distance, the disk 62 is rotated when the stopper is moved.
The drive source 41 is controlled by a signal from the detection member 64 counting the holes of the stopper 23 relative to the edge of the paper depending on the length of the paper size used.
is located a predetermined distance behind.

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 31 to which the push-up plate 32 of the supply section 4 is pivotally attached, and this lever 67 is heated clockwise by a spring 68. By engaging with a protrusion 69a of another lever 69 provided on the side plate 8 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 bell l-101 of the electrophotographic copying machine. Therefore, when the conveyor belt (101) moves, the driving force applied thereto is transmitted to the shaft 9b via the pulley 13, belt 16, and pulley 15, and the rotation direction of both gears 103 and 14 is the same as that of the spring 11. Since it is in the direction in which it bites in due to the biasing force, it is a reliable meshing engagement.

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 apparatus is started, the transport bell 1-10 of the transport reversing section 2 starts moving in the direction of the arrow as described above.

After this, for example, if both copying modes are set to perform double-sided copying, the ejection switching section 1/T1+No. The flapper 6 is moved to a state where the paper is guided to the automatic paper reversing device according to the present invention.

Also, depending on the paper size set on the operation panel of the electrophotographic copying machine, the size of the paper size (both sides) 26.26 and the stopper 2
3 moves to an appropriate position and waits. That is, first, when the drive source 41 is driven with the solenoid 50 inactive, one gear 51 of the two-pronged swing plate 48 is activated via the belt 45. By rotating, this one gear 51
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 are moved via racks 28.28 in accordance with the set paper size, and this movement is stopped at appropriate positions by rONJ and rOFFJ signals of two microswitches 60.60.

Further, the stopper 23 is also moved via the wire 61 because the driving force of the drive source 41 is delivered to the i-bundle 56 and the pulley 53 via the belt 45 when the solenoid 50 is activated. The amount of movement is determined by the fact that when the pulley 53 rotates, the wire 61 rotates a disk 62 wound around the shaft IJ63, and the hole in this disk 62 is connected to the detection member 6.
Since the count is 4, 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 101 and passes through the fixing device, the flapper 6 of the discharge switching unit 1 moves the paper into the transport path 79 by the supply roller. 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. 10, and since the reversal starts immediately after being pressed, the sheet smoothly passes through the transport path 80 between the reversing guide plate 20 and the transport bell (10) and reaches the stand which is the upper surface of the chassis bottom plate 21. It is something that is stored in power.

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 device issues a signal indicating that copying of one side has been completed, and this signal activates the solenoid 50 and the drive source 41, which further activates the supply unit 4.
The drive source 72 of is also activated.

Therefore, the other gear 52 of the bifurcated rocking plate 48 rotates, the gear 5G and the pulley 53 that mesh with this gear 52 also rotate, and the tooth that meshes with the gear 56 also rotates. The gear 65 having the section 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.

Then, just before the leading edge of the bundle of paper contacts the front end stopper 33 while being located on the upper surface of the push-up temporary 32, the drive source 41 stops, the stopper 23 stops, and the pin 70 of the gear 65 moves to the lever. 69 and therefore
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, the drive source 72 of the supply belt 35 rotates for the time required to convey one sheet of paper, so the topmost sheet is guided f! When the paper bundle is conveyed by the supply belt 35 along the upper part along the line 36, only the central part of the leading edge of the paper bundle is lifted up by the push-up plate 32, and therefore both sides are conveyed by the supply belt 35 in a state where it hangs down. However, since both sides of the front end stopper 33 become higher as they move inward, the portion where the lower surface of the paper comes into sliding contact rises, and the bending angle increases as the folding angle moves inward. Therefore, since it is large, it is possible to maintain a substantially constant hanging state regardless of the size of the paper.

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 on which both sides have been copied is ejected to the outside.In this way, the other side is sequentially copied, and the paper in the stacker runs out? -Na W
LP 1': L +--, Noi 97L'i'n
11828 m J6 'W, shi j? Furthermore, 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. Moreover, even if the paper is stuck to the conveyor belt due to static electricity when it is reversed and placed in the storage area, it can be reliably peeled off from the conveyor belt and placed in the storage area. Furthermore, it has excellent effects such as being able to be built into a small electrophotographic copying apparatus or the like.

[Brief explanation of drawings]

The drawings show an automatic paper 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. Schematic diagrams, 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 for raising and lowering the push-up plate. 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/moving section 4... Supply section 6... 2... Flapper 7. 50... Solenoids 9 a, 9 b, 9 C--Axle 10... Conveyor belt 12... Rocking plate 17... Cover plate 18.18A ...Rollers 19,79,80...Conveyance path 23...Stopper 24d...Slanted surface portion 25...Tongue portion 32... ...Pushing plate 33...Front end stopper 33b...Bending portions 34a, 34b...Roller 35...Supply belt 37... Roller 38... Double feed prevention roller 40.45... Belt 41.72... Drive source 48... Bifurcated rocking plate 67.69... ... Lever 4Q figure 4b figure 5Q figure

Claims (1)

[Claims] It has a conveyance and reversal unit that receives paper that has been processed on one side, sends it forward by a plurality of conveyor belts, then reverses and conveys it backwards, and a stopper that comes into contact with the leading edge of the reversed paper. 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; and a supply unit that has a supply belt that sequentially feeds out the sheets that have stopped at the predetermined position. In the automatic paper reversing device, the stopper of the stacking and moving section is located below between the plurality of rows of conveyor belts of the conveying and reversing section, and the upper part of the stopper is lower than the lower surface of the conveyor belt. An automatic paper reversing device characterized in that it is located upwardly.