JP3521378B2 - Duplex copying machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper reversing device for a double-sided copying machine.

[0002]

2. Description of the Related Art Conventionally, an image is recorded on the front surface of one sheet of recording paper and then fixed, and then the recording paper is reversed and re-fed. There are many known double-sided copying apparatuses that record images on both sides.
As the configuration of the double-sided copying apparatus, an image is recorded on the surface of the recording paper and then fixed, the recording paper is reversed by a recording paper reversing mechanism, and the recording paper is temporarily accumulated in a stacking unit. Next, the accumulated recording sheets are sequentially conveyed to the transfer unit, and after the images are recorded on the back side, they are fixed and discharged.

In such a double-sided copying mechanism, the mechanism for reversing and re-feeding the recording paper can be formed in a small size, and even if it is built in the copying machine, it does not require so much space. However, it is difficult to miniaturize the mechanism of the stacking unit that temporarily stacks the recording paper after reversing and re-feeding the recording paper, and it is necessary to provide a large space in the copying apparatus to incorporate the stacking unit.

Therefore, there is a drawback that the entire copying apparatus becomes large. Therefore, as a means for providing a stacking unit for recording paper without increasing the size of the copying apparatus, a means for providing a stacking unit for stacking recording paper by utilizing a part of the sorter position that is now attached to the paper discharge unit is proposed. Has been done. As such means, Japanese Utility Model Laid-Open No. 59-166248 and Japanese Patent Laid-Open No. 61-10907.
No. 1 and No. 61-130128 are known. By using the sorter position in this way, it is possible to prevent the copying machine from increasing in size.

[0005]

As described above, when the double-sided copying mechanism is provided in the copying machine, the entire copying machine becomes large by incorporating the recording paper reversing mechanism and the recording paper stacking mechanism.
Therefore, as described above, a part of the sorter position must be utilized, a recording paper stacking portion must be provided, and means for inverting the recording paper must be provided in the copying apparatus. In this case, a user who does not need a sorter often purchases a useless device. Further, since a part of the sorter is used, it is necessary to reduce the number of sorter discharge trays to be installed, and thus it is necessary to reduce the number of recording sheets to be discharged.

Therefore, in the case of a copying machine that does not use a sorter, only the recording paper stacking unit is provided outside, and the entire structure of the copying machine cannot be downsized.

Further, in the conventional double-sided copying apparatus, the recording sheets are once stacked and accumulated on the stack section of the recording sheets, and the recording sheets are re-fed from the stack section. There are drawbacks such that other recording papers are adhered and dirty, or recording papers are adhered to each other during re-feeding to cause double paper feeding, which easily causes a jam.

The present invention has a compact double-sided copying function, does not cause double feeding when recording paper is re-fed from the inside of the apparatus, and is a safe and reliable double-sided paper that prevents stains on the recording paper. It is an object to provide a copying machine.

[0009]

For the above-mentioned purpose, the present invention provides an image forming means according to claim 1, and a fixing means for fixing an image on a recording paper on which an image is formed by the image forming means, In a copying machine having a recording paper branching unit for branching a recording paper that has been fixed to the outside of the copying machine or to re-feed the inside of the copying machine, a driving roller and a driven roller are provided on one axis. , A drive roller attached to another axis,
A pair of recording paper nip conveying means for combining the driven roller and the driven roller so that the driving roller and the driven roller are in contact with each other, and the pair of recording paper nip conveying means is branched by the recording paper branching means and re-fed. The printed recording paper is sandwiched, and the support guide means for movably supporting the pair of recording paper sandwiching and conveying means and the recording paper branching means are re-fed. After the recording paper is conveyed for a predetermined distance by the pair of recording paper nipping and conveying means, the recording paper is stopped while nipping one end of the recording paper, and the recording paper is further reversed and re-fed to the transfer portion. 4. The pair of recording paper sandwiching and conveying means according to claim 3, wherein the driving roller provided on the one axis and a driven roller provided on the other one axis are combined, and a driven roller provided on the one axis. , A drive unit mounted on another axis 5. A plurality of the pair of recording paper sandwiching and conveying means in combination with a plurality of zigzag footprints are arranged in a zigzag pattern, and the image forming means and the recording paper on which an image is formed by the image forming means are arranged. In a copying machine having a fixing means for fixing an image and a recording paper branching means for branching the fixed recording paper for discharging the paper outside the copying machine or re-feeding the paper inside the copying machine, a driving roller and a driven roller. A roller is provided on one axis, a drive roller provided on another axis is combined with a driven roller, and the drive roller and a pair of recording paper sandwiching and conveying means for bringing the driven roller into contact with each other, Among the pair of recording paper pinching and conveying means, a driving member that engages with only one driven member provided on one axis is provided, and the driving member and the one driven member according to claim 5, The recording paper After the recording paper re-fed into the copying machine by the various means is sandwiched by the pair of recording paper sandwiching and transporting means and transported for a predetermined distance, the recording paper is stopped while holding one end of the recording paper, and the recording paper is further loaded. 8. The sheet is reversed and re-fed to the transfer portion. In claim 6, the driven members provided on one axis are provided at both ends of the one axis. Forming means, fixing means for fixing the image on the recording paper on which the image is formed by the image forming means, and recording for branching the fixed recording paper to eject it outside the copying apparatus or to re-feed it inside the copying apparatus. In a copying machine having a paper branching means, after the recording paper re-fed into the copying machine by the recording paper branching means is conveyed for a predetermined distance, the recording paper is stopped while holding one end of the recording paper, and further recording is performed. A plurality of recording papers that are paired to reverse and re-feed the paper to the transfer unit A holding and conveying means, a supporting guide means for movably supporting the plurality of recording paper holding and conveying means, and a pressing means for pressing both extreme end positions of the pair of recording paper holding and conveying means, In the item 8, the pressing means suspends a wire-shaped member at both extreme end positions of the pair of recording paper sandwiching and conveying means, fixes one end of the wire-shaped member to the apparatus main body, and ends the other end. By providing an elastic member on each of the plurality of recording paper holding / conveying means constituted by a pair, each of the plurality of recording paper holding / conveying means constituted by a pair is configured to contact each other. 11. The reverse L-shaped guide means is movably arranged, and in the claim 10, the plurality of recording paper sandwiching and conveying means composed of the pair movably arranged in the reverse L-shaped guide means, Lower the recording paper sandwiching and conveying means arranged in a substantially vertical direction. Ri achieved by an auxiliary resilient portion for holding.

[0010]

1 is a front view of the overall structure of a double-sided copying apparatus 100 according to the present invention.

The double-sided copying apparatus 100 is constructed such that a charging device 102, a developing device 103, a transfer device 104, a separator 105, and a cleaning device 106 are provided on the outer periphery of a photosensitive drum 101 provided in the double-sided copying device 100. They are arranged in the order of operation. The charger 10 is provided on the surface of the photosensitive drum 101.
After the electric charge is applied in step 2, the original automatically fed to the exposure unit 201A by the automatic original feeder 200 provided on the top of the double-sided copying apparatus 100 is irradiated by the exposure lamp 201,
The photoconductor drum 101 is exposed by the mirrors 202, 203, 204, 205 and the imaging lens 206 in the direction of the arrow.
An electrostatic latent image is formed on the surface, and then the developing device 103 develops the electrostatic latent image to form a visible toner image on the surface of the photosensitive drum 101.

On the other hand, it is possible to feed a large number of recording papers into the paper feed cassettes 111 and 112 which are vertically arranged in the double-sided copying apparatus 100 and the frame 300 on which the double-sided copying apparatus 100 is placed. A paper feeding unit 113 and a paper feeding cassette 114 are provided respectively.

The original document is sent to the exposure section 201A by the automatic document feeder 200 or manually, and the original size is detected automatically by detecting the original size, or the recording paper P of the manually designated size is recorded. When the paper is fed from each paper feeding device, the recording paper P of the size specified as described above
Is a double-sided copying apparatus 100 and any of the recording paper guides 120, 121, 122, 123 provided in the frame 300.
Is conveyed while being detected by the recording paper detection members S1, S2, S3, S4, and is temporarily stopped by the recording paper detection member S5 provided at the position of the registration roller 115, and then the photosensitive drum 101
It is provided so as to be fed so as to match the toner image formed on the.

Further, the paper feeding cassettes 111, 112, 1
14 and the paper feed unit 113 includes a paper feed roller 11
6, 117, 118, and 119 are provided, and the recording paper P is fed and conveyed.

Next, the toner image formed on the photoconductor drum 101 is transferred to the recording paper P by the transfer device 104, and the recording paper P is separated from the photoconductor drum 101 by the separator 105, and then heat-fixed. The toner image on the recording paper P is thermally fixed by the device 107, and is conveyed in the paper discharge direction by the conveying roller 108.

Reference numeral F denotes an exhaust device, which protects the photosensitive drum 101 by exhausting ozone generated by the charging action of the charger 102 and heat generated by the heat fixing device 107 provided in the double-sided copying device 100. There is.

Next, in the case of single-sided copying in which the recording paper P is discharged to the discharge tray 124 by the discharge rollers 109, it is discharged to the discharge tray 124 as it is, but double-sided copying is performed on the recording paper P. In this case, the conveyance path is switched by the recording paper branching member 110, and the recording paper is conveyed to the first recording paper conveyance unit 125.
The leading end of the conveyed recording paper P is first detected by the detection member S6 provided on the frame 300, and the detection information is input to the control unit C. Then, the recording paper P is conveyed to the recording paper stack reversing unit 302 installed in the frame 300. When the recording paper P is conveyed to the recording paper stack reversing unit 302, the recording paper P is supplied to a predetermined position of the recording paper stack reversing unit 302.
A recording paper guide member 127 is provided on the frame 300.

The recording sheet P conveyed by the first recording sheet conveying section 125 is composed of a pair of driving roller and driven roller from a supply outlet 126 provided at the end of the first recording sheet conveying section 125, The recording paper P is supplied between the rollers 301 (hereinafter, referred to as a pair of rollers) serving as a nipping / conveying means by the guide of the recording paper guide member 127. The recording paper stack reversing unit 30
2 is formed in an inverted L shape, and has a vertical guide portion 303,
The vertical guide portion 3 is formed integrally with the inclined guide portion 304.
03 and the pair of roller groups 301 in the tilt guide portion 304, the recording paper P is supplied as described above.

When the recording paper P is supplied between the pair of roller groups 301, and the recording paper P is detected by the detection member S6, only the pair of roller groups 301 located at the position supplied by the control unit C. The recording paper P is started to rotate in the conveying direction, and the recording paper P is dropped in the vertical direction on the stack portion 305 by its own weight while holding the recording paper P. At this time, the detection member S8 detects the leading edge of the recording paper P that has dropped, and the controller C causes the controller C to rotate the pair of roller groups 301 for a certain period of time and then stop the detection of the trailing edge of the recording paper P. One pair roller group 3
01, the recording paper P is stopped while being held between the pair of roller groups 301 while the trailing edge of the recording paper P is left with a fixed amount.
Are stored in the stack portion 305 in the vertical direction. Then, the housed state of the stack unit 305 is detected by the non-contact detection unit including the light source SL and the light receiving element S9, and is input to the control unit C.

When the next second recording sheet P is conveyed to the recording sheet conveying section 125, the pair of roller groups 301 move the inclined guide section 304 while sandwiching the rear end of the first recording sheet P. After moving and stopping, the next pair of rollers 301 is the supply outlet 1.
It waits at the position of 26 and is stopped. When the second sheet of recording paper P detects the detection member S6, only the next pair of rollers 301 rotates, nipping the trailing edge of the recording paper P leaving a fixed amount, and stopping the recording paper P. The stack portion 305 is stored vertically.

When a predetermined number of recording papers P are stored in the stack section 305, the first pair of rollers 301 returns to the position of the recording paper guide member 127 or its normal position by the double-sided copying method. From then on, the pair of roller groups 301 reversely rotate and the feeding is started from the rear end of the recording paper P. The fed recording paper P is guided by the guide portion of the recording paper guide member 127, and the detection member S7 detects the leading end of the recording paper P, and then the second
The recording sheet is conveyed by the recording sheet conveying section 129, detected again by the detecting members S2 and S1, and then conveyed again to the position of the registration roller 115, and is temporarily stopped by the detecting member S5.
Paper is fed so that it matches the toner image formed on 1.
An image is transferred to the back surface of the recording paper P by the transfer device 104,
After being separated by the separator 105, the image is heat-fixed by the heat fixing device 107, conveyed by the conveyance roller 108 in the paper ejection direction, and ejected to the paper ejection tray 124.

2, 3 and 4 show the recording paper stack reversing section 30 which is a supporting and guiding means for the pair of roller groups 301.
2A and 2B are a front view and a side view showing a moving mechanism of a pair of roller groups 301, which is movably incorporated in the apparatus.

Side plates 30 provided on both sides of the pedestal 300
0A, 300B, the side plates 300A, 300
As shown in FIG. 2, the recording paper stack reversing section 302, which is formed in an inverted L shape as shown in FIG. 2, is provided at B. As described above, a plurality of bearings are provided in the vertical guide section 303 and the inclined guide section 304. The member 405 is movably fitted. The bearing member 405 includes end portions 404 of the plurality of core shafts 400 shown in FIG.
Through the bearing member 405, the end portion 40
4 are projected to the outside of the core shaft 400.

Further, the groove cam 40 is located outside the vertical guide portion 303 at the moving position of the end portion 404 of the core shaft 400.
8, 409 are provided, the grooved cams 408, 409 are arranged in a vertical position on a part of the side plates 300A, 300B, and are rotatably provided together with the bevel gears 410, 411.
In order to rotate the groove cams 408 and 409 at the same time, bevel gears 414 and 415 are provided at both ends of the shaft 422 that penetrates the side plates 300A and 300B.
Mesh with 411.

Further, the bevel gear 4 is provided at one end of the shaft 422.
The drive gear 421 provided on the side of the gear 15 is provided with a notch gear 419 facing the intermediate gear 420 as shown in FIGS. 2 and 3, and a stopper 418 is fixed to the notch gear 419 shaft. The spring SP2 constantly applies a rotational force to one side, and the locking claw 417 which is operated by the solenoid 416 is locked to the stopper 418, and the notch gear 419 of the cutout gear 419 is provided to the intermediate gear 420 except when the solenoid 416 is operated. The notch positions are facing each other, and when the locking claw 417 releases the stopper 418 by the operation of the solenoid 416, the notch gear 419 meshes with the intermediate gear 420 by the spring SP2, and the notch gear 419 notches after one rotation. The rotation stops at the position, and the locking claw 417 again locks the stopper 418 and stops. That is, it stops at a predetermined position after only one rotation. The notch gear 419 is provided so as to interlock with the recording paper guide member 127, and is provided so as to guide the recording paper P while rotating the recording paper guide member 127 at a predetermined rotation angle.

On the other hand, as shown in FIG. 2, among a large number of bearing members 405 arranged in parallel in the recording paper stack reversing section 302 formed in an inverted L shape, the bearing members 40 provided at the outermost ends respectively.
As a structure for pressing 5 inward, side plates 300A,
The springs SP6, S provided on the 300B in the pressing direction
The other end of the holding rocking levers 900 and 901 elastically held at P7 is brought into pressure contact with the bearing member 405 at the outermost end, so that the core shaft 400 arranged in the vertical guide portion 303.
The end portion 404 of the groove cam 408, 409 is always in contact with the upper end portion and the lower end portion of the groove cam 408.

Further, as shown in FIG. 3, a large number of bearing members 4
05, the wires 412 and 413 are suspended from the bearing members 405 provided at the outermost ends, respectively, and the wires 412 and 413 are suspended from the bearing members 405 provided at the outermost ends. One end of 413 is a side plate 300A,
It is fixed to 300B and the spring SP is attached to the other end.
By providing 1 (only the wire 412 side is shown),
The end portion 404 of the core shaft 400 arranged in the vertical guide portion 303 is always in contact with the upper end portion and the lower end portion of the groove cams 408 and 409. Further, auxiliary springs SP8 and SP9 are provided at the position of the vertical guide portion 303,
It prevents the end portions 404 of the core shaft 400 from being separated from the grooved cams 408 due to the weight of a large number of bearing members 405 arranged in the vertical guide portion 303 dropping downward.

Further, as shown in FIG. 4, each bearing member 405 is
A driving roller 401 that is driven and fixed to a core shaft 400 that is rotatably provided in
A core shaft that rotates in contact with the drive roller 401 and is provided coaxially with a plurality of driven rollers 402 that are rotatably provided on the core shaft 400 and that are alternately arranged. A drive roller 401 driven by a core shaft 400 as described above and a plurality of driven rollers 402 as described above are alternately provided on the shaft 400, coaxially with each other.
00 drive roller 401 and driven roller 402 are in contact with each other to form the pair of roller groups 301. Then, at the positions of both ends 404 of the core shaft 400, the core shaft 400
Gears 403 for individually driving are provided fixedly.

The core shaft 400 constructed as a single shaft as described above.
A drive roller 401 fixed to the shaft and a driven roller 402 rotatably provided on a core shaft 400 composed of another shaft.
And the driven roller 402 rotatably provided on the core shaft 400 composed of the one shaft and the driving roller 401 fixed to the core shaft 400 composed of the other shaft. A plurality of the paired roller groups 301 combined are arranged. As shown in FIG. 4, the drive roller 40 fixed to the core shaft 400 is arranged by arranging the drive roller 401 and the pair of roller groups 301 each including the driven roller 402 in three or more staggered positions.
1 and a driven roller 40 rotatably provided on another core shaft
The recording paper P is provided on all of the plurality of paired roller groups 301 composed of two.
It has become possible to pinch.

Also, as shown in FIG.
The drive roller 4 is attached to the endmost core shaft 400 on which the 413 is suspended.
01 and the driven roller 402 are not provided, and as shown in the figure, the bearing member 405 is provided with a groove so that the wires 412, 41
3 is configured so as to be suspended and not to fall off, and the bearing member 405 at the lower end has auxiliary springs SP8 and SP.
9 are provided respectively and are used for the function of surely bringing the pair of roller groups 301 into contact with each other.

Further, the detecting member 4 is attached to the shaft of the groove cam 409.
23 is fixed and the rotation state of the groove cam 409 is detected by the detection device 42.
The rotation of the groove cams 408 and 409 is controlled by the controller C.

FIG. 5 shows the bearing member 405 movably provided on the recording paper stack reversing unit 302 of the frame 300.
And a core shaft 40 rotatably provided on the bearing member 405.
Drive roller 401 fixed to 0 and driven, and core shaft 4
12 is a perspective view showing a driven roller 402 that is rotatably mounted on a shaft 00 and a part of a gear 403 fixed to a core shaft 400. FIG.

A protective member 302 made of resin or the like is provided on the recording paper stack reversal section 302 provided in a groove on the frame 300.
1,3022 is covered so that the bearing member 405 can move smoothly. Further, the receiving portion 406 that fits into the recording paper stack reversing portion 302 of the bearing member 405 is formed in, for example, a hexagonal shape, and the protection members 3021 and 30 of the recording paper stack reversing portion 302 are formed.
The bearing member 405 is supported and guided by the surface contact 22 and prevents the bearing member 405 from rotating due to the rotation of the core shaft 400.

Gears 403 that are independently driven are fixed to the end portions 404 of the core shafts 400 as described above, and the drive rollers 4 provided on the plurality of core shafts 400 as described above.
01 and driven roller 402, a pair of roller groups 301
When the recording paper P is sandwiched between them and stored in the stack portion 305, drive gears 407 and 407A that drive only the drive roller 401 of the pair of roller groups 301 that sandwich the recording paper P.
It is configured to mesh with.

FIG. 6 is an enlarged cross-sectional view of the driving roller 401 and the driven roller 402 provided on each of the plurality of core shafts 400 in the pair of roller groups 301.

As shown in the figure, the drive roller 401 is fixed to one core shaft 400 by a fixing pin 401A,
Further, the driven roller 402 is rotatably fitted to the core shaft 400 and positioned by an O-ring or the like. Further, an elastic member 402A such as rubber is provided on the outer peripheral portion of the driven roller 402 so that the recording paper P can be reliably nipped and conveyed.
As shown in the figure, the drive roller 401 is also attached to another core shaft 400.
Is fixed by a fixing pin 401A, a driven roller 402 is rotatably fitted to the core shaft 400, and a pair of roller groups 301 including a drive roller 401 and a driven roller 402 provided on the core shaft 400 separate from each other. Are provided in plural.

7, FIG. 8, FIG. 9, and FIG. 10 respectively show a drive mechanism for rotating the gear 403 for driving the pair of roller groups 301 forward and backward, and a pair of roller groups 301 provided in the recording paper stack reversing section 302. The drive mechanism which operates the grooved cams 408 and 409 to move is shown.

First, referring to FIG. 7, intermediate gears 501, 502 are driven through a number of reduction gears from a drive gear 500 provided in a drive motor M1 controlled by the control section C so as to be capable of forward and reverse rotation.
It is connected to 503. Now, when the intermediate gear 503 rotates clockwise by the drive motor M1 that is controlled and rotated by forward rotation (solid arrow), the gears 504 and 505 rotate counterclockwise in mesh with the intermediate gear 503. . A support member 60 is attached to each of the gears 504 and 505 axes.
0, 601 are fixed, and the supporting members 600, 601 are further fixed.
Are provided with actuators 602 and 603, respectively, so as to rotate together with the gears 504 and 505.

On the other hand, an operating member 714 is provided at the other end of a swing lever 712, one end of which is fixed to the core shaft 711, so that the rotary drive causes the gear 504 to rotate counterclockwise as well as the actuator 602 in the counterclockwise direction. By rotating and causing the tip of the actuator 602 to abut against the operating member 714,
The swing lever 712 is rotated clockwise (solid arrow).
At that time, since the operator 603 is also rotating together with the gear 505, it comes into contact with the operating member 714 of the swing lever 712, but in this case, the operator 603 is configured to escape.

Further, the drive gear 40 is attached to the core shaft 711.
7 is rotatably provided, the drive gear 407 meshes with the gear 403 as shown in FIGS. 5 and 7, and the rotation switching gear 7 provided on the swing lever 712.
13 is rotatably attached, and the rotation switching gear 713
Also meshed with.

Further, the intermediate drive gear 706 is rotated only in the counterclockwise direction from the intermediate gears 701, 702, 703, 704 via the reduction gear from the drive gear 700 provided in the drive motor M2 which rotates in one direction in the control section C. By rotating the swing lever 712 in the clockwise direction as described above, the rotation switching gear 713 meshes with the intermediate drive gear 706, and the rotation of the actuator 602 is stopped by stopping the drive motor M1. By rotating the drive motor M2 in this state, one gear provided on the core shaft 400 of the pair of roller groups 301 via the intermediate drive gear 706, the rotation switching gear 713 and the drive gears 407 and 407A. The rotational drive is given to only 403 in the clockwise direction, and after the constant rotation, the drive motor M2 is stopped to stop the rotation of the gear 403.

That is, as shown in FIG. 7, the drive roller 401 constituting the pair of roller groups 301 is driven and rotated by the gear 403, and is rotated together with the driven roller 404 in the direction for accommodating the recording paper P in the stack portion 305. As described in 1, the pair of roller groups 301 with the trailing edge of the recording paper P left behind.
Will stop.

Next, the drive motor M1 is started and the intermediate gears 506, 507, 50 meshed with the intermediate gear 503.
8 through the drive gear 420 shown in FIG.
08 meshes and rotates the bevel gears 414 and 415 counterclockwise as shown in FIG. By the rotation, FIG.
Bevel gears 410 and 411 shown in FIG.
One core shaft is rotated by rotating the groove 409 and the end portion 404 of the core shaft 400 that is in contact with the lower position of the groove cams 408 and 409 is guided upward by the groove cams 408 and 409. , 409 to move to the upper part.

At this time, the driving roller 401 and the driven roller 402 move integrally with the plurality of core shafts 400 provided in the recording paper stack reversing section 302 formed in the inverted L shape. When the movement is completed, the rotation state of the detection member 423 shown in FIG. 4 is detected by the detection device 424, and the controller C controls the groove cams 408 and 409 to stop at a position where they have made one rotation. There is.

In this state, the gear 403 provided on the core shaft 400 is disengaged from the drive gear 407, and the gear 403 provided on the next core shaft 400 meshes with the drive gear 407, so that the drive motor M2 is operated as described above. The rotation of the intermediate drive gear 706 rotates only one gear 403 provided on the core shaft 400 of the pair of roller groups 301 by the rotation of the intermediate drive gear 706 in a clockwise direction, and the drive motor M2 is stopped after a certain rotation. Then, by stopping the rotation of the gear 403, the recording paper P is stored in the stack unit 305 while being sandwiched. In this way, the recording sheets P for double-sided copying are sequentially stored in the stack unit 305.

Next, a method for sequentially reversing the recording papers P stored in the stack unit 305 will be described.

At the time of reverse sheet feeding, the drive motor M1 is reversely rotated by the controller C. That is, the intermediate gear 503 is rotated counterclockwise by the drive motor M1 which is controlled to rotate in the reverse direction (dotted line arrow), and meshes with the intermediate gear 503, and the gears 504 that rotate in conjunction with each other rotate in the clockwise direction.
The actuators 602 and 603 also rotate in the clockwise direction together with 505, and the tip end of the actuator 603 abuts against the actuating member 714, thereby rotating the swing lever 712 in the counterclockwise direction. Therefore, the rotation switching gear 713 provided on the rocking lever 712 is separated from the intermediate drive gear 706, and moves to the solid line position in FIG. 7. At that time, since the operator 602 is also rotating together with the gear 504 as described above, the swing lever 71
The second operating member 714 comes into contact with the second operating member 714, but in this case as well, the operating element 603 is configured to escape and has no effect.

On the other hand, the intermediate drive gear 706 driven by the rotation of the drive motor M2 always meshes with the intermediate gear 708 rotatably provided on the core shaft 711, and further meshes with the intermediate gears 709, 710. And is rotated clockwise with the intermediate gear 710. By rotating the rocking lever 712 counterclockwise as described above, the rotation switching gear 713 provided on the rocking lever 712 meshes with the intermediate gear 710, and accordingly, the rotation switching gear 713.
Rotates counterclockwise, and the drive gear 407 meshing with the rotation switching gear 713 rotates clockwise.

Since the one gear 403 meshing with the drive gear 407 rotates counterclockwise by the above-described rotation operation, the recording paper P whose one end is sandwiched by the pair of roller groups 301 is inverted from the stack portion 305 position. 1 is guided by the other guide portion of the recording paper guide member 127 shown in FIG. 1 and the leading end of the recording paper P is detected by the detection member S7, and then the second recording paper reversal conveyance portion 129 is conveyed, Detection member S
After the detection of S2 and S1, the image is recorded on the back surface of the recording paper P after being conveyed to the position of the registration roller 115 again.

As described above, the drive motor M1 is controlled by the control unit C.
And the intermediate gear 508 together with the bevel gear 4 are rotated in reverse.
10, 411 rotates in the reverse direction, and therefore the groove cams 408, 40
The reverse rotation of 9 causes the end 404 of the core shaft to move to the groove cams 408, 4
09 is moved from the upper position to the lower position, the groove cams 408 and 409 are stopped by one rotation as described above, and the next one gear 4
03 is meshed with the drive gear 407, the drive motor M2 is driven again to feed the next recording paper P in reverse.

FIG. 8 shows one gear 403 meshing with the drive gear 407 shown in FIG. 7, and a swing lever 712.
6 is a side view of the mechanism showing the meshing relationship with the rotation switching gear 713 provided in FIG. As shown in the figure, a core shaft 711 is provided so as to penetrate the gantry 300, and the core shaft 711 is provided with an intermediate gear 708 constantly meshed with an intermediate drive gear 706 and a drive gear 407 rotatably. Operating member 71
4, both ends of the rocking lever 712 provided with 4 are rotatably provided on the core shaft 711, the rotation switching gear 713 is provided on the rocking lever 712, and the rocking lever 712 is combined with the drive gear 407 so as to be constantly meshed.
Further, only one gear 403 provided on the core shaft 400 meshes with the drive gear 407.

The swing lever 712 of FIG. 7 and the gears 504 and 505 for operating the swing lever 712.
FIG. 9 shows the action of the actuators 602 and 603 that rotate together with the actuator and a specific configuration diagram.

First, the pedestal 3 is attached to the swing lever 712.
00 and a protrusion 715 provided on a part of the rocking lever 712 are provided with a spring SP5 that performs a tumbler action, and rocks to the left or right about the line AA and stops. Is configured to. The positions of the actuators 602 and 603 shown in FIG. 6 are shown in a state where they are moved to positions where the operating member 714 of the swing lever 712 is operated.

The operator 602 is supported by the shaft 604 so as to be rotatable only in the counterclockwise direction on the support member 600 fixed to the shaft 607 of the gear 504, and further provided with the elastic member SP3 for biasing in the clockwise direction. ing. When the actuator 602 configured as described above is rotated in the forward rotation (solid arrow) direction, the operation member 714 is operated in the arrow direction, and the swing lever 712 is pushed clockwise, the spring SP5
By the tumbler action of, it passes through the line AA and moves to a predetermined position. Further, the actuator 602 rotates in the reverse direction, and the operating member 714
Is moving to the position indicated by the solid line, the actuator 602 is rotated and eliminated against the elastic member SP3, and after passing, the elastic member SP
Return to the original position at 3.

The operator 603 is also supported by a shaft 606 so that it can be rotated only in a clockwise direction by a support member 601 fixed to a shaft 608 of a gear 505, and an elastic member SP4 for urging in a counterclockwise direction is provided. ing. When the actuator 602 configured in this manner is rotated in the reverse rotation (dotted line arrow) direction to operate the operating member 714 in the dotted line arrow direction and push the swing lever 712 counterclockwise, the spring SP5 The tumbler action of moves through line AA and moves to the position of the solid line. When the actuator 602 rotates in the reverse direction and the operating member 714 moves to the position indicated by the alternate long and short dash line, the actuator 60
2 is rotated and eliminated against the elastic member SP4, and returns to the original position by the elastic member SP4 after passing.

FIG. 10 is a block diagram showing a holding operation for ensuring the swinging action of the swing lever 712 shown in FIG.

The solenoid 800 connected to the control unit C includes an operating member 80 which is operated by turning the power "ON" and "OFF".
1 is provided, while the support shaft 80 provided on the pedestal 300 is provided.
Actuating levers 803 and 806 are rotatably provided on the Nos. 2 and 805, respectively. One ends of the operating levers 803 and 806 are locked to the operating member 801, and the tips 804 and 8
07 are provided so as to be arranged at both side positions within a range in which the protrusion 715 of the swing lever 712 moves.

As described above, when the operating member 714 of the rocking lever 712 is moved, for example, in the clockwise direction by the rotation of the actuator 602, at the same time, the power of the solenoid 800 is turned “on” to pull the operating member 801 to operate. Lever 803,8
06 are rotated to press the protrusion 715 with the tips 804 and 807 (tip 804 in the case of the figure). Therefore, the protrusion 715
At the same time, the swing lever 712 moves slightly clockwise,
The swinging lever 712 operates reliably beyond the line AA by the movement of the protrusion 715 due to the rotation of the actuator 602 and the tumbler action of the spring SP5.

[0059]

According to the first aspect of the present invention, the image forming means, the fixing means for fixing the image on the recording paper on which the image is formed by the image forming means, and the fixed recording paper is discharged to the outside of the copying apparatus. Alternatively, in a copying machine having recording paper branching means for branching for re-feeding in the copying machine, a drive roller and a driven roller are provided side by side on one axis, and a drive roller provided side by side on another axis and a driven side. A pair of recording paper sandwiching and conveying means configured to bring the driving roller and the driven roller into contact with each other by a combination of rollers, and the pair of recording paper sandwiching and conveying means is branched by the recording paper branching means and re-fed. Since the recorded recording paper is sandwiched, the double-sided copying function is downsized, so that the double-sided copying apparatus as a whole can be downsized. Further, it becomes possible to stack the recording sheets on the stack portion without contacting each other, and the recording sheets do not contact with each other, so that the recording sheets can be prevented from being soiled. Also, when re-feeding the recording paper,
Since the recording sheets are separated and stacked one by one, double feeding can be reliably prevented, and no jam occurs. Further, it is possible to install the printer in a narrow place without switching the position to be fed to the stack according to the recording paper size.

According to a second aspect of the present invention, the support guide means for movably supporting the pair of recording paper sandwiching and conveying means and the recording paper re-fed by the recording paper branching means are sandwiched between the pair of recording paper sandwiching means. After the recording paper is conveyed by a predetermined distance while being nipped by the conveyance means, the recording paper is stopped while holding one end of the recording paper, and the recording paper is inverted and re-fed to the transfer section. Since they are sandwiched and stacked by the recording paper sandwiching and conveying means, double feeding does not occur at the time of re-feeding, and the recording paper does not become dirty.

According to a third aspect of the present invention, the pair of recording paper pinching / conveying means by a combination of a driving roller provided on the one shaft and a driven roller provided on the other one shaft, and a driven device provided on the one shaft. A plurality of double-sided recordings are made in a narrow position of the double-sided copying machine by arranging a plurality of the pair of recording paper pinching and conveying means by a combination of a roller and a driving roller provided on another axis in a zigzag footprint. You can stack paper.

The image forming means, the fixing means for fixing the image of the recording paper on which the image is formed by the image forming means, and the fixed recording paper is discharged or copied to the outside of the copying apparatus. In a copying machine having recording paper branching means for branching for re-feeding in the apparatus, a drive roller and a driven roller are provided side by side on one axis, and a drive roller and a driven roller provided side by side on another axis. In combination with the drive roller,
A pair of recording paper pinching and conveying means for bringing the driven roller into contact with each other, and a pair of recording paper nipping and conveying means,
Since it has a driving member that engages only one driven member provided on one axis, the recording paper nipped by the pair of recording paper nip conveying means is surely conveyed to the stack part and stopped, and the pair of recording paper nip conveyance It is possible to move the stack portion while reliably holding the recording paper by the means, and accurately hold the recording paper between the next pair of recording paper holding and conveying means.

According to a fifth aspect of the present invention, the pair of recording paper sandwiching and conveying means conveys the recording paper re-fed into the copying machine by the recording paper branching means by the driving member and the one driven member. After the paper is nipped and conveyed for a predetermined distance, the recording paper is stopped while holding one end of the paper, and the paper is turned over again to be re-fed to the transfer unit.
Prevents stains on recording paper. Further, when the recording paper is re-fed, the recording papers are separated one by one and stacked in the stack portion, so that double feeding can be reliably prevented, and therefore no jam occurs.

According to the sixth aspect of the present invention, since the driven member provided on one axis is provided on both ends of the one axis, the pair of recording paper pinching and conveying means can be driven reliably and the recording paper can be pinched accurately. And is transported.

The image forming means, the fixing means for fixing the image on the recording paper on which the image is formed by the image forming means, and the fixed recording paper is discharged or copied to the outside of the copying apparatus. In a copying machine having recording paper branching means for branching to re-feed the paper, the recording paper is fed by the recording paper branching means into the copying machine for a predetermined distance, and then the recording paper is fed. A pair of recording paper nip conveying means configured to stop while holding one end of the nip, and re-feed the recording paper to re-feed the transfer portion, and the plurality of recording paper nip conveying means can be moved. Since the supporting guide means for supporting and the pressurizing means for pressurizing both extreme end positions of the pair of recording paper sandwiching and conveying means are provided, all contact states of the pair of recording paper sandwiching and conveying means are held, Move the support guide means while holding one end of the recording paper. Since it is possible, it can be sequentially accurately reverse conveying the recording paper for duplex. Therefore,
All recording paper sheets are reliably re-fed without falling off.

In the eighth aspect of the present invention, the pressurizing means suspends a wire-shaped member at both extreme end positions of the pair of recording paper pinching and conveying means, and fixes one end of the wire-shaped member to the apparatus main body. However, by providing an elastic member at the other end, a plurality of recording paper holding / conveying means composed of a pair are brought into contact with each other. Since the supporting guide means can be moved while holding the contact state of No. 2 and holding one end of the recording paper, the recording paper for double-sided copying can be sequentially and accurately conveyed in reverse. Therefore, the recording paper does not drop out, and all the recording papers are reliably re-fed.

In the ninth aspect, since the plurality of recording paper sandwiching and conveying means constituted by the pair are movably arranged in the inverted L-shaped guiding means, the plurality of recording paper sandwiching means constituted by the pair are sandwiched. The conveying means can be arranged in a narrow space of the double-sided copying machine.

In the tenth aspect of the present invention, a plurality of recording paper sandwiching / conveying means constituted by the pair arranged so as to be movable in the inverted L-shaped guide means, the recording paper sandwiching / conveying means arranged substantially vertically. Since it has an auxiliary elastic part that holds it from below,
In particular, it is possible to reduce the weight of the recording paper sandwiching / conveying means arranged in the substantially vertical direction and to reliably hold the contact state of the pair of recording paper sandwiching / conveying means.

[Brief description of drawings]

FIG. 1 is a front view showing the overall configuration of a double-sided copying apparatus of the present invention.

FIG. 2 is a front view showing a recording paper pinching and conveying unit for double-sided copying and a recording paper stack reversing unit of the present invention.

FIG. 3 is a front view showing another recording paper pinching and conveying unit for double-sided copying and a recording paper stack reversing unit according to the present invention.

FIG. 4 is a side view showing a recording paper stack reversing unit and a recording paper pinching and conveying unit of the present invention.

FIG. 5 is a perspective view showing a recording paper pinching and conveying means for double-sided copying of the present invention.

FIG. 6 is an enlarged sectional view showing a recording paper pinching and conveying means for double-sided copying of the present invention.

FIG. 7 is a configuration diagram showing a drive mechanism of a recording paper pinching and conveying means for double-sided copying of the present invention.

FIG. 8 is a side view showing a part of a drive mechanism of a recording paper nip conveyance device for double-sided copying according to the present invention.

FIG. 9 is a configuration diagram showing a part of a drive mechanism of a recording paper pinching and conveying means for double-sided copying of the present invention.

FIG. 10 is a configuration diagram showing a part of a drive mechanism of a recording paper pinching and conveying means for double-sided copying of the present invention.

[Explanation of symbols]

100 double-sided copying machine 200 Automatic document feeder 300 mounts 301 pair roller group 302 Recording paper stack reversing unit 305 Stack 400 core shaft 401 drive roller 402 Driven roller 403 gears 409 groove cam 600,601 Support member 602, 603 actuator 712 swing lever P recording paper C control unit

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-108978 (JP, A) JP-A-10-45308 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 29/58 G03G 15/00 106 G03G 15/00 510

Claims (10)

(57) [Claims] 1. An image forming unit, and a fixing unit for fixing an image on a recording sheet on which an image is formed by the image forming unit,
In a copying machine having a recording paper branching unit for branching a recording paper that has been fixed to the outside of the copying machine or to re-feed the inside of the copying machine, a driving roller and a driven roller are provided on one axis. A pair of recording paper pinching and conveying means for combining the drive roller and the driven roller, which are arranged on another axis, so that the driving roller and the driven roller are in contact with each other, and the pair of recording paper pinching and conveying means. A double-sided copying apparatus, wherein the recording paper which is branched and re-fed by the recording paper branching unit is sandwiched. 2. A support guide means for movably supporting the pair of recording paper nipping and conveying means, and a recording paper re-fed by the recording paper branching means, which are predetermined by the pair of recording paper nipping and conveying means. 2. The double-sided copying apparatus according to claim 1, wherein after the paper is conveyed for a distance, the recording paper is stopped while holding one end of the recording paper, and the recording paper is inverted and re-fed to the transfer section. 3. A pair of recording paper pinching and conveying means by a combination of a drive roller provided on the one axis and a driven roller provided on another axis, a driven roller provided on the one axis, and another 2. A double-sided copying machine according to claim 1, wherein a plurality of said pair of recording paper sandwiching and conveying means in combination with a driving roller provided on one axis are arranged in a zigzag footprint pattern. 4. An image forming unit, and a fixing unit for fixing an image on a recording sheet on which an image is formed by the image forming unit,
In a copying machine having a recording paper branching unit for branching a recording paper that has been fixed to the outside of the copying machine or to re-feed the inside of the copying machine, a driving roller and a driven roller are provided on one axis. A pair of recording paper pinching and conveying means for combining the drive roller and the driven roller, which are arranged on another axis, so that the driving roller and the driven roller are in contact with each other, and the pair of recording paper pinching and conveying means. Among these, a double-sided copying machine having a driving member that meshes with only one driven member provided on one axis. 5. The recording paper re-fed into the copying machine by the recording paper branching means by the driving member and the one driven member is sandwiched by the pair of recording paper sandwiching and transporting means and predetermined. 5. The double-sided copying apparatus according to claim 4, wherein after being conveyed for a distance, the recording paper is stopped while holding one end of the recording paper, and the recording paper is further reversed and re-fed to the transfer section. 6. The double-sided copying apparatus according to claim 4, wherein the driven member provided on one axis is provided on both ends of the one axis. 7. An image forming unit, and a fixing unit for fixing an image on a recording sheet on which an image is formed by the image forming unit,
In a copying machine having recording paper branching means for branching the fixed recording paper to the outside of the copying machine or to re-feed the inside of the copying machine, the paper is re-fed into the copying machine by the recording paper branching means. After conveying the formed recording paper for a predetermined distance, the recording paper is stopped while holding one end of the recording paper, and further the recording paper is sandwiched and conveyed by a pair for reversing and re-feeding the recording paper to the transfer portion. A support guide means for movably supporting the plurality of recording paper holding and conveying means, and a pressurizing means for pressurizing both end positions of the pair of recording paper holding and conveying means. Copying device. 8. The pressurizing means suspends wire-shaped members at both extreme end positions of the pair of recording paper sandwiching and conveying means, respectively.
8. A plurality of recording paper sandwiching and conveying means composed of a pair are brought into contact with each other by fixing one end of the wire-like member to the apparatus main body and providing an elastic member at the other end. Double-sided copying machine described. 9. The double-sided copying machine according to claim 7, wherein the plurality of recording paper sandwiching and conveying means constituted by the pair are movably arranged in the inverted L-shaped guide means. . 10. A plurality of recording paper holding / conveying means constituted by the pair movably arranged on the inverted L-shaped guiding means, and assisting to hold the recording paper holding / conveying means arranged substantially vertically from below. The double-sided copying machine according to claim 8 or 9, further comprising an elastic portion.