JPS63180646A - Paper conveyor - Google Patents

Abstract

PURPOSE:To make any noise so as not to be emitted out of paper at the time of conveyance, by forming a loop making part with a guide plate, and making each conveying speed of a conveying roller and a resist roller almost accord with each other by a control circuit, in case of a paper conveyor for an electrophotographic copier or the like. CONSTITUTION:In a paper conveyor conveying the paper fed out of a paper feeder A to an image forming part B, is formed with a conveying passage between two sets of vertical guides 1, 2, 6 and 7 set up in the onward direction of paper P at the specified interval. And, in a conveying passage at the side short of the conveying direction of the paper, there are a vertical pair of conveying rollers 3 and 4, and also in a conveying passage at the side in font of the conveying direction, there are provided with a vertical pair of resist rollers 8 and 9, respectively. And each of these guide plates 1 and 6 is raised upward, forming a loop making part, and furthermore there is provided with a control circuit. This control circuit makes each conveying speed of these conveying rollers 3, 4 and resist rollers 8 and 9 accord with one another, and it is made so as to convey the paper P in the state that a loop is always formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper conveying device attached to an electrophotographic copying device, etc., and in particular, it forms a loop in the paper during the conveyance process, and the paper is transported while holding this loop. The present invention relates to a paper conveyance device that conveys paper.

[Prior art and its problems]

Generally, when feeding paper from a paper feeder to a device such as an electrophotographic copying device, the paper fed from the paper feeding device is sequentially received and transferred to registration rollers installed in the electrophotographic copying device. Then, the middle part of the paper is raised upward to form a loop, and then the registration rollers are activated at a predetermined timing to feed the paper.

During this re-feeding process, if there is a difference in the conveying speed between the registration rollers that convey the paper and the conveyance rollers, the loop that has been formed will be resolved, and at this time, noise may be generated.
In particular, when paper is conveyed at high speed, the noise generated at this time becomes so loud that it cannot be ignored, posing a problem.

This invention solves the problems of the conventional methods as described above, and allows electrophotographic copying from a paper feeding device! A portion including the registration rollers leading to the image forming section such as position A is set as a paper conveyance device as a unit separate from the electrophotographic copying device, etc., and when the paper is conveyed by this paper conveyance device, there is a difference in the conveyance speed of each conveyance roller. To provide a paper conveying device which prevents noise from being generated from paper even when noise occurs.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a paper document feeding device that is provided inside the main body of an electrophotographic copying device and conveys paper fed from a paper feeding device to an image forming section of the electrophotographic copying device. In this paper conveyance device, a conveyance path is formed between two sets of upper and lower guide plates arranged at a predetermined interval in the direction in which the paper travels, and a conveyance path of the paper in the conveyance path is A pair of upper and lower conveyance rollers is disposed on the conveyance path on the front side in the direction, and a pair of upper and lower registration rollers are disposed on the conveyance path on the front side in the conveyance direction, and adjacent portions of each of the upper guide plates are raised upward. , a chevron-shaped loop creating portion is formed at a predetermined interval, and a 1lith ff11 circuit is further provided, and this control circuit drives the pair of upper and lower conveyance rollers and the registration rollers by substantially reducing the conveyance speed. The paper is conveyed with a loop formed therein.

[Effect]

With this invention configured as described above, the paper fed from the paper feeding device to the electrophotographic copying device or the like is held at the registration rollers and then re-transported at the transport speed of the transport rollers and the registration rollers. Since the loop is almost completely broken, the formed loop does not dissolve, and therefore, the noise that occurs when it dissolves does not occur, and especially when paper is conveyed at high speed, it can be conveyed quietly. becomes.

〔Example〕

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

The drawings show a paper conveyance device according to the present invention provided in an electrophotographic copying machine, and this paper conveyance device, as shown between the dashed lines in FIGS. It is located between a paper feed device 71A such as a paper feed cassette and an image forming section B that forms a toner image on the surface of the fed paper, and the image forming section B forms a toner image on the surface of the fed paper. This is used to transport the paper to the transfer/separation section B, and an intermediate stacker for double-sided copying is provided at the bottom of this paper transport device.

As shown in the overall schematic diagram, this paper conveyance device is located on the paper feed device rIIA side of the main body of the electrophotographic copying apparatus. Inner temporary 1.
2, and a pair of upper and lower conveyance rollers 3.4 are provided at the center of the pair of upper and lower first guide plates l, 2.

Further, from the bottom, for example, a conveyance path C for a single-sided copy sheet is provided in series when double-sided copying is performed.

The conveyance roller 3 of the pair of upper and lower first guide plates 1.2
．． 4, the first upper guide plate 1 rises upward to widen the conveyance path.

And at the top of this upwardly rising part,
A plurality of plate-shaped pressing members 5 made of Mylar or the like are arranged at predetermined intervals in the center direction.

Further, the first lower chamber board 2 also has a forward side in the paper conveyance direction that rises slightly upward, and this portion forms a paper orientation section.

Further, a pair of upper and lower second guide plates 6.7 are provided continuously to the upper and lower pair of first guide plates 1.2 in the paper transport direction. The second upper guide plate 6 adjacent to the first upper guide plate 1 which is rising upward also rises upward, thereby allowing the first and second lower guide plates 2.7 to convey the material almost horizontally. The first and second upper guide plates 1.6 form the lower part of the passage.
The conveyance path is formed so that the connecting portion faces upward, that is, in the shape of a mountain.

A mountain-shaped loop forming portion is formed between the pair of upper and lower first guide plates 1.2 and the pair of upper and lower second inner plates 6.7.

A pair of upper and lower registration rollers 8.9 are provided in a portion of the pair of upper and lower second guide plates 6.7 adjacent to the image forming section B of the electrophotographic copying apparatus.
A registration section is composed of a guide plate 6.7 and a pair of upper and lower registration rollers 8.9.

Therefore, in this paper conveyance device, two conveyance sections are spaced apart from each other by a predetermined distance, and the connecting section is shaped like a mountain rising upward, and each conveyance section is provided with a roller.

Each member configured as described above is movable horizontally within the main body of the electrophotographic copying apparatus, centering on one of its four corners, and can be fixed at any position. It is located in

Further, adjacent to the pair of upper and lower first E inner plates 1.2 and on the forward side in the paper conveyance direction, an opening is provided on the conveyance roller 3.4 side and parallel to the conveyance roller 3.4. Suction tubes to, 11 are provided, respectively.

Each of the suction tubes 10.11 is arranged adjacent to the portions 10a, lla fixed to the main body side of the electrophotographic copying apparatus, and adjacent to these portions 10a, lla, as well as adjacent to the tapping member 27. part 1
0b and llb, and the intermediate part of the part fixed to the main body side of the electrophotographic copying apparatus is a deformable part 12 having flexibility, and furthermore, a drawing part 10a of the suction tube. , 10b, lla, llb
The adjacent ends of are cut diagonally and become one piece when pressed in the direction of approach, but 511 when pressed in the direction of separation.
(See Figures 1 and 4).

As shown in FIG. 5, the suction tube has a plurality of slits 28, 28 of different sizes in the portions 10b and llb on the paper dust knocking member 27 side.
・The one that sucks the formed one from one end of the suction tube, or the one with multiple slits 29.29...
. . . with a suction pipe member 30 connected to the center thereof, or a suction pipe member 31, 31, etc. shown in FIG. 8 with an opening in each slit independently.・・・
・In order to keep the amount of suction from each slit constant, the size of each slit can be increased as the distance from the suction direction increases.
It is possible to obtain the same suction.

Further, a support plate 15 is provided on the part fixed to the main body side of the electrophotographic copying apparatus as shown in FIG. 3, where the back side of FIG. 1 is viewed from the back side. A drive source 16 is provided on this support plate 15 .

This drive source 16 is different from a drive source for driving an image carrier, etc. provided in the main body of an electrophotographic copying device, and is a dedicated drive source 16 for the paper conveyance device according to this invention. The driving force is transferred to the paper feeder side A via the belt 17.
The shaft 17 of the upper conveying roller 3 of the pair of upper and lower conveying rollers 3.4 provided on the pair of upper and lower guide plates L and 2 of the electrophotographic copying apparatus, and the pair of upper and lower guide plates 6 on the image forming section B side of the electrophotographic copying apparatus. ．．
A loop clutch 22 provided on the shaft 21 of a gear 20 that meshes with a gear 19 provided on the shaft 18 of the upper registration roller 8 of the pair of upper and lower registration rollers 8. The driving force is transmitted through the clutch 23, and is further transmitted to the rollers of the paper conveyance path for double-sided copying.

A pair of upper and lower conveyor rollers 3.4 provided in the middle of a pair of upper and lower first guide plates 1 and 2 on the side of the paper feeder are arranged to move the paper 11.
It is constructed by attaching a plurality of rollers 25.25... of a predetermined length to the shaft 26, which do not have the same diameter throughout, and in this case, the plurality of rollers 25.25...・
. . . includes a paper conveyance roller 3 and a roller serving as a paper dust knocking member 27 for collecting paper dust, and the central part of the paper to be conveyed is held between the conveyance rollers. The paper is conveyed, and rollers serving as the paper dust knocking member 27 come into contact with both ends of the paper (see FIG. 9).

In this case, a conductive bristle brush is used as the paper dust knocking member 27, so that static electricity can be removed from the paper at the same time.

Therefore, the paper dust knocking member may be a foam roller as long as it is made of an electrically sensitive material.

Further, the paper dust attached to the paper dust knocking member 27 is sucked into the suction tubes 10b and llb, and at this time, in order to remove all the paper dust from the paper dust dusting member 27, Agitator (paper dust scraping member) 32, which comes into contact with the dusting member 27.
(See Figure 10).

In other words, this agitator 32.32...
Suction tube 10b, llb and paper powder dusting member 2
7, and when the paper dust knocking member 27 rotates, the agitators 32, 32, etc.
By hitting the paper powder, attached paper powder is removed and sucked into the suction tubes lQb and llb.

Therefore, the agitators 32, 32, . . . facilitate the collection of paper dust adhering to the paper dust knocking member 27 into the suction tube.

Note that in the above method, a roller serving as a paper dust knocking member 27 coaxial with the transport roller 3 is disposed adjacent to the transport roller 3, and the paper dust is collected by this row. In this way, the drive source for the conveyance roller 3 and the paper dust knocking member 27 is common, and the space can be made small, but even if the paper dust dusting member 27 is coaxial with the conveyance roller. Alternatively, the paper beating member may be made of a foamed material such as foamed urethane, and a charging device may be provided to charge the foamed material. The dusting member may be composed of an electrocardiographic material such as a bristle brush or a sponge.

FIGS. 11 and 12 show means for collecting paper dust attached to the paper dust knocking member 27 without using a suction tube, and in the one shown in FIG. Along with this, the paper dust knocking member 27
A storage container 33 with an opening facing toward the paper dust knocker 27 is provided adjacent to the paper dust knocking member 27, and this storage container 33 is removable using a click plate 34. An abutting agitator 35 is provided.

Therefore, even if the structure is configured without using a suction tube as described above, the paper powder can be reliably stored inside the storage container 33 without scattering the paper powder.

Further, the one shown in FIG. 12 further includes a charging auxiliary member 3.
This charging auxiliary member 36 is electrically charged, and the beating member 27 is made of resin fiber, which is electrically charged to facilitate collection of attached paper powder. belongs to.

Therefore, for example, when the paper dust knocking member 27 is made of aryl resin, if the paper being conveyed is (-) charged, the charging auxiliary member 36 is made of polyethylene or the like, and if the paper is (+) charged, the charging auxiliary member 36 is made of polyethylene or the like. In this case, the charging hli auxiliary member 36 is made of rayon or the like.

Further, the paper dust knocking member 27 is preferably one that does not interfere with the conveyance of the paper by the conveyance roller, and therefore, if it is coaxial with the conveyance roller, it has the same diameter as the conveyance roller or a smaller size (No. 9I21 ) is preferred.

Next, the operation of the above will be explained.

First, when paper is fed from the paper feeding device arranged on the paper feeding side of the electrophotographic copying machine, this paper is carried into the interior of a pair of upper and lower industrial boards 1.2, and is conveyed by a pair of upper and lower Roller 3.
Reach 4.

The pair of upper and lower conveyance rollers 3.4 are not rollers having the same diameter throughout the width direction as described above, but are composed of a plurality of rollers 25, 25, etc. in 11 directions. ,
Since it carries out the function of transporting the paper, not all the rollers are used, but the roller 25 located in the center becomes the transport roller 3, and the rollers 25 located at both ends of the paper serve as the paper dust knocking member 27.
It becomes.

In other words, during the conveyance process, the paper comes into contact with various members and generates paper dust at that time, so the paper dust adheres to the paper. Paper powder is attached to various members located in the area.

Therefore, the paper dust attached to the paper is removed by the paper dust knocking member 27, and since this removal work is performed during the conveyance of the paper, it does not interfere with the conveyance of the paper. .

Then, the paper conveyed through the conveyance path between the pair of upper and lower guide plates 1.2 is carried out from the guide plates 1 and 2. On the discharge side of the guide plates 1.2, the paper is transferred to the lower guide plate 2. The paper is conveyed while sliding on the upper surface, but as mentioned above, the end of the lower guide plate 2 has a direction part that rises slightly upward, so the paper that reaches this part is directed upward. At this time, since the upper guide plate 1 is also raised upward, the paper is directed upward during its conveyance.

When the leading edge of the paper oriented upward next comes into contact with the second upper guide plate 6 by the pressing member 5, the inclination of the second upper guide plate 6 changes when the leading edge of the paper abuts. Since the inclination angle is oriented downward, the paper is directed inside the conveyance path formed between the second upper and lower guide plates 6 and 7.
Therefore, a loop is always created in the part of the paper located in this area, and since the leading edge of the paper comes into contact with the upper and lower pair of registration rollers 8.9, the whitening of the paper is corrected. It will be transported to image forming section B of the electrophotographic copying apparatus.

After this, an image is formed in the image forming section B.
The image is fixed by a fixing device and then discharged outside.

As described above, while the paper reaches the image forming section B of the electrophotographic copying device from the paper feeder TIA, it passes through the conveying device according to the present invention. A pair of registration rollers 8.9 are located, and a pair of upper and lower transport rollers 3.4 on the A side of the paper feeder simply function as transport rollers, so the paper fed from the paper feeder ZA is , First, a pair of upper and lower conveyor rollers 3.4
At this time, paper dust is removed and the first guide plate 1.
At the end of step 2, it is directed upward by the lower guide plate 2, and since the upper interior panel 1 is rising upward, it is directed upward, and a plate-shaped pressing member 5 made of Mylar or the like is attached to the upper end of the upper guide plate l. is provided so that it contacts the upper end of the second upper guide plate 6, and in this case, the lower guide plate 6 is oriented downward, so that the paper that rises upward will be looped at the loop creation section here. The paper is formed and moves downward until its tip reaches between the registration rollers 8 and 9 and stops, thereby correcting the whitening of the paper.

Then, the conveyance roller 3.4 and the registration roller 8.9
The timing of the operation of the clutches 22, 23 is as shown in FIG. The control circuit is turned on and off, and although a control circuit for starting and stopping at such timing is not shown, a conventionally known control circuit can be used.

FIG. 14 shows a flowchart controlled by the control circuit as described above, and FIG. 15 shows the connection state between the control circuit, the sensor, and the clutch.

As shown in FIG. 13, a registration sensor (not shown) provided in the transport path formed by the second guide plate 6.7 detects the transported paper, and after a predetermined period of time has elapsed, the registration clutch 23 is activated. 0FFL, the pair of upper and lower conveyance rollers 3.4 is stopped, and at this time the loop clutch 22 is turned off.
Therefore, the paper is waiting with a loop formed at the connecting portion of the conveyance path formed by both guide plates 1.2 and 6.7.

After that, when the engine starts at low speed, the loop roller 22 and the resist clutch 23 are turned ON at the same time.
As a result, the pair of upper and lower transport rollers 3.4 and the pair of upper and lower registration rollers 8.9 simultaneously start rotating at approximately the same speed to transport the paper to the image forming section B.
Therefore, since a loop is always formed in the portion of the paper located inside the chevron-shaped loop forming section formed between the conveyance paths, - in the end, when the loop is eliminated, the paper is If the front end is pulled quickly relative to the rear end, noise is generated, but in the above case, the loop does not disappear, so no sound is generated, and the object is transported quietly.

In this conveyance process, the registration roller 8
．． Even if the paper temporarily on standby at 9 becomes white, the pair of upper and lower second guide plates 6.7 supporting the pair of upper and lower registration rollers 8.9 and the conveyance roller 3 Since it has a separate structure from the pair of upper and lower first guide plates 1.2 that support .4, the paper surface can be corrected by moving in the horizontal direction.

In addition, since the Φ linear velocity of the pair of upper and lower transport rollers 3.4 and the pair of upper and lower registration rollers 8.9 is almost the same, the loop formed between the upper and lower guide boards is always the same as described above. The paper will be fed while it is in this position.

This reliably prevents the sound that would be generated when the leading edge of the paper is pulled, which can cause problems with noise, especially when paper is transported at high speeds. According to the invention, it is possible to convey the object quietly without the risk of generating noise, and it is very effective in the case of high-speed conveyance.

〔Effect of the invention〕

With the above configuration, this invention allows the paper to be transported in a bent state rather than in a tensioned state during the transport process, so there is no risk of noise being generated from the paper during transport, and especially when the paper is transported at high speed. It has excellent effects such as being able to transport it silently even when transporting it.

[Brief Description of the Drawings] Figure 1 is a schematic perspective view showing the entire suction tube, Figure 2 is a longitudinal sectional view, Figure 3 is a rear view, Figure 4 is a schematic diagram showing the entire suction tube, Figure 5, FIGS. 6 and 7 are schematic diagrams showing the main parts of the suction tube, FIG. 8 is a diagram showing the opening of the tube member, FIG. 9 is a diagram showing the relationship between the conveyance roller and the paper dust knocking member, and FIG. Figure 10 is a diagram showing the relationship between the suction tube, paper dust knocking member, and agitator, Figure 11 is a diagram showing the relationship between the paper dust dusting member and the storage container, and Figure 12 is a diagram showing the relationship between the paper dust dusting member, the storage container, and the charging Fig. 13 is a diagram showing the drive timing of the conveyance roller, loop roller, and registration roller, Fig. 14 is a flowchart, and Fig. 15 is a diagram showing the relationship with the auxiliary members. FIG. l, 2...First guide plate 3.4...Conveyance roller 5...Press member 6.7...Second guide plate 8.9. ...Registration roller 10S11...Suction tube 12...
... Deformable part 15 ... Support plate 16 ... Horse drive source 17 ... Belt 18.21, 26 ... Shaft 19.20. ... Gear 22 ... Loop roller 23 ... Resist clutch 25 ... Roller 27 ... Paper dust dusting member (roller) 28.29
．． 30...Surisoto 31...Pipe member 32.35...Agitator (paper dust scraping member)
33...Storage container 34...Click plate 36...Charging auxiliary member Fig. 3 Fig. 4 1n ・11 Fig. 5 Doji Doji 28 Topi Fig. 7 Fig. 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 15

Claims (1)

[Claims] A paper transport device that is provided inside the main body of an electrophotographic copying device and transports paper fed from a paper feeding device to an image forming section of the electrophotographic copying device. A conveyance path is formed between two sets of upper and lower guide plates arranged at a predetermined interval, and a pair of upper and lower conveyance rollers is provided on the front side of the conveyance path in the paper conveyance direction. Further, a pair of upper and lower registration rollers are respectively disposed on the transport path on the front side in the transport direction, and adjacent portions of each of the upper guide plates are raised upward to form chevron-shaped loop forming portions spaced apart at a predetermined interval. Further, a control circuit is provided, and this control circuit drives the pair of upper and lower conveyance rollers and the registration rollers at almost the same conveyance speed, so that the paper is
A paper conveyance device characterized by conveying paper with a loop formed therein.