JPH1124331A - Duplex copying machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a double-sided copying apparatus incorporating a stacker for stacking copy papers in a reversing conveyance section, the number of copies is limited by the capacity of the stacker. Further, there is a drawback that the apparatus becomes large due to the double-sided copying stacker. To solve this drawback. SOLUTION: By using a document conveying device having a reverse conveying function and repeatedly using the document conveying device many times, a large number of double-sided copies are performed without being limited by the capacity of a stacker for double-sided copying. As a copy stacker, a stacker in which copy sheets are sandwiched one by one and used is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex copying apparatus for copying images on both sides of a document on both sides of copy paper.

[0002]

2. Description of the Related Art A two-sided copying apparatus for forming an image on both sides of paper requires a small amount of paper and is an effective machine from the viewpoint of resource saving and reduction of waste, and is widely used. When a plurality of copies are to be made by a conventional double-sided copying apparatus, after copying on one side of the copy paper, the copy paper is temporarily stacked on a stacker in the copy machine, and the copy paper is turned upside down from the stacker. The copy paper is conveyed and copied on the other side. That is, a stacker for temporarily stacking copy paper is provided in the copying machine.

[0003]

Since a stacker for reversing paper feed is provided in a copying machine, there is a limit in the paper storage capacity. Therefore, in a conventional double-sided copying machine having a built-in stacker for reversing sheet feeding, the number of copies that can be copied on both sides is limited. Increasing this limit inevitably increased the size of the device. Also,
Since the reversing paper feed path is complicated, paper jams are easily generated. SUMMARY OF THE INVENTION An object of the present invention is to provide a double-sided copying apparatus which is improved from such a conventional double-sided copying apparatus and is capable of performing double-sided copying of a large number of copies. Also,
It is an object of the present invention to provide a double-sided copying apparatus which is compact and has a very low incidence of paper jams.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
An exposure section for supporting a document at an exposure position, a document conveyance section for conveying the document to the exposure position, a document reversal conveyance section for moving the document at the exposure position from the exposure section, turning the document over, and then conveying the document to the exposure section; A forming unit, a copy paper transporting unit for transporting the copy paper toward the image forming unit, a copy paper reversing transporting unit and a control unit for reversing the copy paper passing through the image forming unit and transporting the copy paper to the image forming unit again Wherein the control unit comprises:
(1) controlling the document transport unit to position the document at the exposure position; and (2) controlling the image forming unit and the copy paper transport unit to store a plurality of images on the first surface of the document at the exposure position. (3) The above (2), which is formed on the first surface of a copy sheet.
Controlling the document reversing and conveying unit to reverse the document at the exposure position and position it again at the exposure position. (4) controlling the copy paper reversing and conveying unit and the image forming unit to Forming an image of the second side of the document on the second side of the copy sheet; (5) controlling the document reversing and conveying section to reverse the document after the control of (4); (6) controlling the copy paper transport section and the image forming section to form an image on the first side of the document positioned at the exposure position by the control of (4) on the copy paper;
(7) After the control of (6), the document inverting unit is controlled to invert the document and position the document at the exposure position. (8)
By controlling the copy paper reversing and conveying unit and the image forming unit, the second position of the original positioned at the exposure position by the control of (7).
This is achieved by a double-sided copying apparatus characterized in that control is performed to form an image of a side on a second side of a copy sheet.

[0005]

FIG. 1 is a block diagram of a two-sided copying apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a control operation of a control unit of the copying apparatus.

As shown in FIG. 1, the control unit performs the control operation shown in FIG. 2 based on copy mode information for duplex copying from a duplex document input from the operation panel and copy number information input from the numeric keypad.

The control operation will be described below.

[0008] When a double-sided mode in which copying is performed on both sides of a copy sheet from a double-sided original and a duplex mode is selected and the copy button is pressed,
A document is transported from the document transport unit, copy paper transport and image formation are performed, and an image of the first surface of the document is copied onto the first surface of the copy paper. In the paper discharge unit, the number of copies is counted, and it is determined whether or not the number of copies N has reached the set number of copies N ₀ . The operation so far is the same as that of the conventional copying apparatus. Next, in the double-sided copying apparatus, the number of copies N is compared with the copy sheet storage capacity n ₀ of the stacker in the copy sheet reversing and transporting unit built in the copying apparatus, that is, the maximum number of sheets that can be stored in the stacker. Is done. Number of copies N is capacity n
If it is larger than ₀ , the process proceeds to the next step, that is, the document reversal conveyance. Incidentally, because if the number of copies N is greater than the capacity n ₀ means that the set number N ₀ is greater than the capacity n _0. This is because if N ≦ n ₀ , the process proceeds to the document reversal conveyance in the step of looking at N = N ₀ .

The document reversal conveyance, copy paper reversal conveyance and image formation are executed, and the image of the second surface of the document is copied on the second surface of the copy paper. In this double-sided copying, the number N of copies is compared with the set number N _0, and if N = N ₀ , the copying operation ends. If the set number N ₀ is larger than the capacity n ₀ and N = N ₀ is not satisfied, the document is further reversed and conveyed. That is, the document whose second surface is in the image reading state is
As a result of the document being inverted and conveyed, the first surface of the document is read. Next, copy paper conveyance and image formation are performed, and the image of the first side of the document is copied onto the first side of the copy paper. This copying operation is continued, and the number N of copies is compared with a value N ₀ −n ₀ obtained by subtracting the capacity n ₀ from the set number N ₀ . N
If it is determined that N = N ₀ -n ₀ , document reversal conveyance, copy paper reversal conveyance, and image formation are executed, and the second side of the document is copied on the second side of the copy paper. Copy of the second face of the image of the original on the second surface of the copy sheet is Trigger on N = N ₀ -n _0, copying is completed.

[0010] It is also possible to set a larger number of sheets. If the set number is set to three times or more the maximum capacity of the stacker in the copy paper reversing conveyance section, the reversal conveyance of the original, the conveyance of the copy paper, and the reversal conveyance of the copy paper are repeated, and the set number of copies is performed. Will be

The present invention is particularly effective when used in a small-sized copying machine. In one embodiment of the present invention, the copy apparatus is further reduced in size and the paper jam is reduced by the unique copy paper reversing and conveying section. Was. Next, an embodiment provided with such a copy sheet reversing and conveying unit will be described with reference to FIGS.

FIG. 3 is a front sectional view showing the entire structure of a two-sided copying apparatus according to an embodiment of the present invention. This double-sided copying apparatus includes an image recording unit 100 for recording an image of a document, an automatic document feeder 200 for transporting the document to an exposure position, and a gantry 3 having a paper feeding unit and a reversing unit for reversing and transporting a copy sheet.
It consists of 00.

In the image recording section 100, a charger 102, a developing device 103, a transfer device 104, a separator 105, and a cleaning device 106 are arranged around the photosensitive drum 101 in the order of operation. After a charge is applied to the surface of the photosensitive drum 101 by the charger 102, the image recording unit 100
The automatic document feeder 200 having a document transport unit 202 and a document reversal transport unit 203
1 is illuminated by an exposure lamp 113 with an exposure lamp 113, and is exposed in the direction of the arrow by mirrors 114, 115, 116 and 117 and an imaging lens 118 to form an electrostatic latent image on the surface of the photosensitive drum 101. Form. Next, 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, a paper feed cassette 111 constituting a paper feed unit disposed at an upper and lower position in the image recording section 100,
112 are provided. A paper supply unit 310 capable of supplying a large number of copy papers and a paper supply cassette 311 are provided in the gantry 300. Paper cassette 111,
Although the sheet 112 is slightly inclined at the front end as shown in FIG. These paper cassettes have a maximum paper storage capacity of about 500 sheets. The paper feed unit 310 is a large capacity paper feed unit,
It has a capacity to accommodate 500 or more sheets.

The document is automatically sent to the exposure unit 201 by the automatic document feeder 200 or manually, and the size of the document is automatically detected by detecting the size of the document. Paper cassette 111,
When paper is fed from one of the paper feed units 112 and 311 and the paper feed unit 310, the copy paper P of the designated size as described above is copied to the image recording unit 100 and one of the copy papers provided in the frame 300. Paper guides 120, 121, 314, 3
After being conveyed while being detected by the copy paper detecting members S1, S2, S3, and S4 at 15 and temporarily stopped by the copy paper detection member S5 provided at the position of the registration roller 119, the photosensitive drum 1
No. 01 is provided so as to be coincident with the toner image formed thereon.

The paper cassettes 111, 112, 3
11, and a paper feed roller 310
2, 123, 312, and 313 are provided to feed and convey the copy paper P.

The toner image formed on the photosensitive drum 101 is transferred to a copy paper P by a transfer unit 104, and the copy paper P is separated from the photosensitive drum 101 by a separator 105. The toner image on the copy paper P is heat-fixed, and is transported by the transport roller 108 in the paper discharge direction.

F denotes an exhaust device which removes ozone generated in the charger 102 and the transfer device 104 by an ozone filter 126.
To protect the photosensitive drum 101 by exhausting heat generated by a heat fixing device 107 provided in the image recording unit 100.

In the case of one-sided copying, the copy paper P is discharged to the discharge tray 124 by the discharge rollers 109. However, in the case of performing double-sided copying on the copy paper P, the conveyance path is controlled by the copy paper branching member 110. The paper is switched to the copy paper branch / conveyance unit 125. The leading end of the conveyed copy paper P is first detected by the detection member S6 provided on the gantry 300, and the detection information is input to the control unit C. Then, the copy paper P is conveyed to the double-sided copy stacker 302 installed in the gantry 300. When the copy paper P is transported to the two-sided copy stacker 302, the copy paper guide member 317 is mounted on the base 3 so that the copy paper P is supplied to a predetermined position of the two-sided copy stacker 302.
00 is provided.

The copy paper P conveyed through the copy paper branch / conveyance section 125 is supplied from a supply outlet 316 provided at an end of the copy paper branch / conveyance section 125 to a plurality of rollers 301 each having a pair of a driving roller and a driven roller. (Hereinafter referred to as a paired roller group)
In the meantime, the copy paper P is supplied by the guide of the copy paper guide member 317. The stacker 302 for double-sided copying is formed in a substantially inverted L-shape, and is integrally formed with a vertical guide portion 303 and an inclined guide portion 304.
The copy paper P is supplied between the pair of roller groups 301 in the inclined guide 304 as described above.

When the copy sheet P is supplied between the pair of roller groups 301 and the detection member S6 detects the copy sheet P, only the pair of roller groups 301 at the position supplied by the control unit C is used. The rotation of the copy paper P is started in the transport direction, and the copy paper P is dropped in the stack chamber 305 by its own weight in the vertical direction while sandwiching the copy paper P. At this time, the detecting member S8 detects the leading end of the falling copy sheet P, and the control section C rotates the pair of roller groups 301 for a certain period of time and stops after detecting the trailing end of the copy sheet P by the detection member S6. One roller group 3
01, the copy paper P is stopped while being nipped between the pair of roller groups 301 while leaving a fixed amount of the rear end of the copy paper P.
Are stored in the stack chamber 305 in the vertical direction. Then, the stored state of the stack chamber 305 is detected by the non-contact detecting means including the light source SL and the light receiving element S9, and is input to the control unit C. As described above, the copy sheets P are stacked in a state of hanging vertically.

When the next copy sheet P is conveyed through the copy sheet branching / conveying section 125, the pair of rollers 301 keeps the rear end of the first copy sheet P sandwiched by the inclined guide section 30.
4 and is stopped, and the next pair of rollers 301 is stopped at the position of the supply outlet 316 while waiting. Then, when the second copy sheet P detects the detection member S6, only the next pair of rollers 301 rotates, holding the rear end of the copy sheet P by a fixed amount, and stops the copy sheet P, as described above. Stack room 30
5 in the vertical direction.

When a predetermined number of copy sheets P are stored in the stack chamber 305, the first pair of rollers 301 returns to the position of the copy sheet guide member 317 or moves from the position as it is by the double-sided copying method. The pair of rollers 301 rotates in the reverse direction and starts feeding from the rear end of the copy sheet P. The fed copy paper P is guided by the guide section of the copy paper guide member 317, and after detecting the leading end of the copy paper P by the detecting member S7, the copy paper transport section 319 transports the inverted copy paper. Transported,
After being detected by the detecting members S2 and S1, the sheet is again conveyed to the position of the registration roller 115, temporarily stopped by the detecting member S5, and then fed so as to coincide with the toner image formed on the photosensitive drum 101. The transfer device 10
4, the image is transferred and separated by the separator 105, and then the image is heat-fixed by the heat fixing device 107.
At 08, the sheet is conveyed in the sheet discharge direction, and is discharged to the sheet discharge tray 124 by the sheet discharge rollers 109. The copy paper branching / conveying unit 125, the pair of rollers 301, the copy paper conveying unit 319, and the like constitute a copy paper reversing / conveying unit in the present invention.

FIGS. 4 and 5 show a pair of roller groups 301 movably incorporated in the duplexer stacker 302. FIG.
It is the front view and side view which show the drive mechanism of FIG.

The inside of the gantry 300 has side plates 30 provided on both sides.
0A, 300B, and the side plates 300A, 300B.
B is provided with a double-sided copy stacker 302 which is formed in a substantially inverted L-shape, as shown in FIG. 2, and has a large number of bearings in the vertical guide 303 and the inclined guide 304 as described above. A member 405 is movably fitted. The bearing member 405 is provided with the end portions 404 of the plurality of core shafts 400 shown in FIG. 5 penetrating through the bearing member 405, and each of the end portions 404 is projected outside the core shaft 400.

Further, the groove cam 40 is positioned outside the vertical guide portion 303 at the position where the end portion 404 of the core shaft 400 moves.
8, 409 are provided, and the groove 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 simultaneously rotate the groove cams 408 and 409, bevel gears 414 and 415 are provided at both ends of a shaft 422 that penetrates the side plates 300A and 300B, and the bevel gears 410 and 415 are provided.
Engage with 411.

Further, at one end of the shaft 422, the bevel gear 4
The drive gear 421 provided on the side of the notch 15 has a notch gear 419 facing the intermediate gear 420 as shown in FIG.
The notch gear 419 is provided with a stopper 4
18 is fixed, a rotating force is always applied to one side by a spring SP2, and a locking claw 417 operated by a solenoid 416 is locked to the stopper 418.
When the notch 16 is not in operation, the notch position of the notch gear 419 faces the intermediate gear 420, and when the solenoid 416 is operated, the locking claw 417 is moved to the stopper 41.
8 is released, the notch gear 419 is set by the spring SP2.
Engages with the intermediate gear 420, and after one rotation, the rotation stops at the notch position of the notch gear 419, and the locking claw 4
17 stops by stopping on the stopper 418. That is, it stops at a predetermined position by only one rotation. The notch gear 41
9 is provided in conjunction with the copy paper guide member 317 so as to guide the copy paper P while rotating the copy paper guide member 317 at a predetermined rotation angle.

On the other hand, as shown in FIGS. 4 and 5, among the many bearing members 405 arranged side by side on the double-sided copying stacker 302 formed in an inverted L-shape, bearing members provided at the extreme end portions, respectively. Wire 412 so as to press 405 inward.
By suspending the wire 413 and fixing one ends of the wires 412 and 413 to the side plates 300A and 300B and providing springs SP1 (only the wire 412 side is shown) at the other ends, the wires 412 and 413 are arranged in the vertical guide portion 303. The end 404 of the core shaft 400 is configured to always contact the upper and lower ends of the groove cams 408 and 409.

Further, as shown in FIG.
A plurality of drive rollers 401 fixed to and driven by a core shaft 400 rotatably provided on the shaft 400, and driven rollers 402 rotatably provided on the core shaft 400 and rotatably provided in contact with the drive roller 401. A plurality of driving rollers 401 driven by the same core shaft 400 and a plurality of driven rollers 402 similar to the above are alternately provided coaxially on another core shaft 400 which is provided coaxially and arranged side by side. A driving roller 401 of a separate core shaft 400 and a driven roller 402
Are brought into contact with each other to form the paired roller group 301. At the position of the end 404 of the core shaft 400, a gear 403 for individually driving the core shaft 400 is fixedly provided.

Also, as shown in FIG.
The driving roller 4 is attached to the core shaft 400 at the extreme end where the suspension 413 is suspended.
01 and the driven roller 402 are not provided, and the bearing member 405 is provided with a groove as shown in FIG.
3 is suspended so as not to fall off, and is used only for the function of securely bringing the pair of roller groups 301 into contact with each other.

The shaft of the groove cam 409 has a detecting member 4
23, 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 control unit C.

FIG. 6 shows the bearing member 40 movably provided on the duplexer stacker 302 of the gantry 300.
5 and a core shaft 4 rotatably provided on the bearing member 405.
9 is a perspective view showing a driving roller 401 fixed and driven at 00, a driven roller 402 rotatably provided on a core shaft 400, and a part of a gear 403 fixed to the core shaft 400. FIG.

A protective member 3 made of resin or the like is formed on a double-sided copying stacker 302 provided in a groove shape on the gantry 300.
021 and 3022 so that the bearing member 405 can move smoothly. Further, the receiving portion 406 of the bearing member 405 that fits into the duplex copying stacker 302 is formed, for example, in a hexagonal shape, and the protection member 30 of the duplex copying stacker 302 is formed.
The bearing member 405 is guided by surface contact with the bearings 21 and 3022 to prevent the bearing member 405 from rotating due to rotation of the core shaft 400.

The independently driven gears 403 are fixed to the end portions 404 of the core shaft 400 as described above, and the drive rollers 4 provided on the plurality of core shafts 400 as described above are respectively provided.
01 and a pair of roller groups 301 including driven rollers 402
When the copy paper P is held between the stack chambers 305, the drive gear 407 that drives only the drive roller 401 of the pair of roller groups 301 holding the copy paper P is meshed with the drive gear 407.

FIG. 7 is an enlarged sectional view of a driving roller 401 and a driven roller 402 provided on a plurality of core shafts 400 in the paired roller group 301.

As shown in the figure, a driving roller 401 is fixed to one core shaft 400 with fixing pins 401A, and a driven roller 402 is rotatably fitted to the core shaft 400, and is connected by an E-ring or the like. Positioned. An elastic member 402A made of rubber or the like is provided on the outer peripheral portion of the driven roller 402, so that the copy paper P is reliably held and conveyed. As shown in the drawing, a driving roller 401 is fixed to another core shaft 400 by a fixing pin 401A, and the driven roller 402 is
00, which are rotatably fitted to the core shaft 4
00 and a driven roller 40
A plurality of paired roller groups 301 composed of two rollers are provided.

FIGS. 8, 9, 10 and 11 show a driving mechanism for rotating the gear 403 for driving the pair of rollers 301 forward and backward, respectively, and moving the pair of rollers 301 provided on the stacker 302 for double-sided copying. Groove cams 408 and 409
2 shows a drive mechanism for operating the.

First, in FIG. 8, the intermediate gears 501, 502, 5 and 5 are driven by a large number of reduction gears from a drive gear 500 provided on a drive motor M1 controlled to be capable of normal and reverse rotation by a control unit C.
03. Now, when the intermediate gear 503 is rotated clockwise by the drive motor M1 controlled and rotated by the forward rotation (solid arrow), the gears 504 and 505 rotate counterclockwise in mesh with the intermediate gear 503 and interlock therewith. . Each of the gears 504 and 505 has a supporting member 60
0, 601 is fixed, and the support members 600, 601
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 the swing lever 712 having one end fixed to the core shaft 711, and the operating element 602 is also moved counterclockwise together with the gear 504 rotating counterclockwise by the above-mentioned rotation. By rotating, the tip of the actuator 602 abuts against the operating member 714,
The swing lever 712 is rotated clockwise (solid arrow).
At this time, since the actuator 603 is rotating together with the gear 505, the actuator 603 comes into contact with the operating member 714 of the swing lever 712, but in this case, the operator 603 is configured to escape.

The drive shaft 40 is provided on the core shaft 711.
The drive gear 407 meshes with the gear 403 as shown in FIG. 4 and FIG. 8, and further, a rotation switching gear 7 provided on the swing lever 712.
13 is rotatably mounted, and the rotation switching gear 713 is provided.
Also meshed.

Further, the control unit C rotates the intermediate drive gear 706 only in the counterclockwise direction from the intermediate gears 701, 702, 703, and 704 via the reduction gear from the drive gear 700 provided on the drive motor M2 that rotates in one direction. By rotating the swing lever 712 clockwise as described above, the rotation switching gear 713 meshes with the intermediate drive gear 706, and the rotation of the actuator 602 stops when the drive motor M1 stops. By rotating the drive motor M2 in this state, only one gear 403 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 gear 407 is provided. Is rotated clockwise, and after a certain rotation, the drive motor M2 stops and the rotation of the gear 403 stops.

That is, as shown in FIGS. 4, 5, and 6, the driving roller 401 constituting the pair of roller groups 301 is driven to rotate by the gear 403, and the copy paper P is driven together with the driven roller 404.
5 is rotated in the direction in which the
As described above, the paired roller group 301 stops with the rear end of the copy sheet P left.

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 421 shown in FIG.
08 are engaged, and the bevel gears 414 and 415 rotate counterclockwise as shown in FIG. By the rotation, FIG.
The bevel gears 410 and 411 shown in FIG.
409 is rotated to move the end portion 404 of the core shaft 400 in contact with the lower position of the groove cams 408, 409 upwardly by the groove cams 408, 409. , 409 to move to the top.

At this time, the drive roller 401 and the driven roller 402 move together with the plurality of core shafts 400 provided in the double-sided copy stacker 302 formed in an inverted L-shape. When the movement is completed, the rotation state of the detecting member 423 is detected by the detecting device 424, and the groove cam 40 is detected.
Control unit C so that 8,409 stops at the position where it has completed one rotation
Is controlled by

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, and the drive motor M2 With the rotation of the intermediate drive gear 706, only one gear 403 provided on the core shaft 400 of the pair of rollers 301 is rotated clockwise through the drive gear 407 via the drive gear 407, and the drive motor M2 stops after a certain rotation. Then, the rotation of the gear 403 is stopped, and the copy paper P is stored in the stack chamber 305 while being held therebetween. In this way, the copy paper P for duplex copying is sequentially stored in the stack chamber 305.

Next, a method of sequentially reversing and feeding the copy paper P stored in the stack chamber 305 will be described.

At the time of reverse sheet feeding, the drive motor M1 is reversely rotated by the control unit C. That is, when the intermediate gear 503 is rotated counterclockwise by the drive motor M1 that is controlled to rotate in the reverse direction (dotted arrow), the intermediate gear 503 meshes with the intermediate gear 503, and the gear 504 that rotates clockwise in conjunction with the intermediate gear 503.
Actuators 602 and 603 also rotate clockwise together with 505, and when the tip of the actuator 603 abuts against the operating member 714, the swing lever 712 rotates counterclockwise. Accordingly, the rotation switching gear 713 provided on the swing lever 712 is separated from the intermediate drive gear 706 and moves to the solid line position in FIG. At this time, since the actuator 602 is rotating together with the gear 504 as described above, the swing lever 71 is rotated.
The second contact member 714 contacts the second actuating member 714, but in this case also, the actuator 603 is configured to escape so that there is no influence.

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 and 710. And is rotated clockwise with the intermediate gear 710. By rotating the swinging lever 712 in the counterclockwise direction as described above, the rotation switching gear 713 provided on the swinging 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.

One of the gears 403 meshing with the drive gear 407 rotates counterclockwise by the above-described rotation, so that the copy paper P, one end of which is sandwiched by the pair of rollers 301, is inverted from the position of the stack chamber 305. After being guided by another guide portion of the copy paper guide member 317 shown in FIG. 3 and detecting the leading end of the copy paper P by the detection member S7, the copy paper is transported to the second copy paper reversal transport portion 319, Detection member S
After the detection of S2 and S1, the sheet is conveyed again to the position of the registration roller 115 and an image is recorded on the back surface of the copy sheet P.

As described above, the drive motor M1 is controlled by the control unit C
And the bevel gear 4 together with the intermediate gear 508
10, 411 rotate in the reverse direction, so that the groove cams 408, 40
9 to rotate the end 404 of the core shaft into the groove cams 408 and 4.
09 is moved from the upper position to the lower position, and the groove cams 408 and 409 are stopped by one rotation as described above.
After the gear No. 03 meshes with the drive gear 407, the drive motor M2 is driven again to reversely feed the next copy sheet P.

FIG. 9 shows one gear 403 meshing with the driving gear 407 shown in FIG.
FIG. 10 is a side view of a mechanism showing a meshing relationship with a rotation switching gear 713 provided in FIG. As shown in FIG.
The intermediate drive gear 7 is provided on the core shaft 711.
06, the intermediate gear 708 constantly meshed with the driving gear 40
7 is rotatably provided, and furthermore, both ends of a swing lever 712 provided with an operating member 714 are rotatably provided on a core shaft 711, and a rotation switching gear 713 is provided on the swing lever 712.
Combined so that it always meshes with the drive gear 407,
The drive gear 407 includes one gear 40 provided on the core shaft 400.
3 is configured to be engaged.

FIG. 10 shows the swing lever 71 of FIG.
2 and the gear 50 to operate the swing lever 712.
4 shows the operation of the actuators 602 and 603 rotating together with 4,505 and a specific configuration diagram.

First, the gantry 3 is attached to the swing lever 712.
A spring SP5 that performs a tumbling action is provided between a part of the swing lever 712 and a projection 715 provided on a part of the swing lever 712, and swings to the right or left around the line AA to stop. It is configured to be. The positions of the actuators 602 and 603 shown in FIG. 8 are shown in a state where they have been moved to positions where the operating members 714 of the swing lever 712 are operated.

The actuator 602 is supported by a support member 600 fixed to the shaft 607 of the gear 504 so as to be rotatable only in the counterclockwise direction, and further provided with an elastic member SP3 for urging clockwise. ing. When the operating member 602 thus configured is rotated in the forward rotation (solid arrow) direction, the operating member 714 is operated in the arrow direction, and the swing lever 712 is pushed clockwise, the spring SP5
And passes through the line A-A by the tumbling function of (1) and moves to a predetermined position. Also, the operating member 602 rotates in the reverse direction, and the operating member 714 is actuated.
Is moved to the solid line position, the actuator 602 is rotationally eliminated against the elastic member SP3, and after passing, the elastic member SP
It returns to the original position with 3.

The actuator 603 is also supported by a support member 601 fixed to the shaft 608 of the gear 505 by a shaft 606 so as to be able to rotate only clockwise, and further provided with an elastic member SP4 for urging in a counterclockwise direction. ing. When the operating member 602 thus configured is rotated in the reverse rotation (dotted arrow) direction, the operating member 714 is operated in the dotted arrow direction, and the swing lever 712 is pushed counterclockwise, the spring SP5 And passes through the line A-A by the tumbling function of (1), and moves to the solid line position. When the operating member 602 rotates in the reverse direction and the operating member 714 is moved to the position indicated by the alternate long and short dash line, the operating member
2 is rotated and eliminated against the elastic member SP4, and returns to the original position by the elastic member SP4 after passing.

FIG. 11 shows the swing lever 712 of FIG.
FIG. 3 shows a configuration diagram for performing a holding operation for ensuring swinging operation of the device.

The solenoid 800 connected to the control unit C has an operating member 80 which operates when the power is turned on and off.
1 is provided, while the support shaft 80 provided on the gantry 300 is provided.
2, 805 are provided with operating levers 803 and 806, respectively, which are rotatable. One end of each of the operating levers 803 and 806 is locked by the operating member 801, and
Reference numeral 07 is provided so as to be disposed on both sides of the range in which the protrusion 715 of the swing lever 712 moves.

As described above, when the operating member 714 of the swing lever 712 is moved, for example, clockwise by the rotation of the operating element 602, the power supply of the solenoid 800 is simultaneously turned on to pull the operating member 801 to operate. Lever 803, 8
The projection 715 is pressed by the tips 804 and 807 (the tip 804 in the case of the drawing) by rotating each of the reference numerals 06. Therefore, the protrusion 715
At the same time, the swing lever 712 slightly moves clockwise,
The swinging lever 712 reliably moves beyond the line AA due to the movement of the protrusion 715 by the rotation of the actuator 602 and the tumbling action of the spring SP5.

[0059]

According to the first aspect of the present invention, it is possible to carry out double-sided copying of a large number of copies without being limited by the capacity of the double-sided copying stacker provided in the copy sheet reversing and conveying section. Thus, a double-sided copying apparatus having a large copying ability was realized. Also, according to the invention described in claim 2,
Since the copy paper reversing conveyance section is realized in a small volume and the reversal conveyance path is simplified, a double-sided copying apparatus in which the rate of occurrence of paper jams is suppressed to a very low level is realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment of a duplex copying apparatus according to the present invention.

FIG. 2 is a flowchart showing an operation of a control unit of the embodiment.

FIG. 3 is a front sectional view of the embodiment.

FIG. 4 is a front view of the copy sheet sandwiching and conveying means and the copy sheet reversing and conveying section of the embodiment.

FIG. 5 is a side view of the stacker for duplex copying of the present invention.

FIG. 6 is a perspective view of a stacker for duplex copying according to the present invention.

FIG. 7 is an enlarged sectional view showing a stacker for duplex copying of the present invention.

FIG. 8 is a configuration diagram showing a driving mechanism of the stacker for duplex copying of the present invention.

FIG. 9 is a side view showing a part of the driving mechanism of the stacker for duplex copying of the present invention.

FIG. 10 is a configuration diagram showing a part of a drive mechanism of the duplexer stacker of the present invention.

FIG. 11 is a configuration diagram showing a part of a drive mechanism of the stacker for duplex copying of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Image recording unit 111, 112, 311 Paper feed cassette 310 Paper feed unit 122, 123, 312, 313 Paper feed roller 125 Copy paper branching and conveying unit 200 Automatic document feeder 300 Mount 301 Double roller group 302 Double-sided copy stacker 305 Stack Room P Copy paper

Continued on the front page (72) Inventor Hisao Sato 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation (72) Inventor Tadayoshi 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation

Claims (2)

[Claims] 1. An exposure section for supporting a document at an exposure position, a document transport section for transporting the document to the exposure position, and a document for moving the document at the exposure position from the exposure section, turning over the document, and then transporting the document to the exposure section A reversing transport section, an image forming section, a copy paper transport section for transporting the copy paper toward the image forming section, and a copy paper reversal for reversing the copy paper passing through the image forming section and transporting the copy paper to the image forming section again Consists of a transport unit and a control unit,
The control section controls (1) the document transport section to position the document at the exposure position, and (2) controls the image forming section and the copy paper transport section to control the first position of the document at the exposure position. Forming an image of the side on the first side of a plurality of copy sheets;
(3) after the control of (2), controlling the document reversing and transporting unit to reverse the document at the exposure position and position it again at the exposure position; (4) the copy paper reversing and transporting unit and the image forming And (5) controlling the document reversing / transporting unit to control the original to form a document on the second side of the plurality of copy sheets. (6) controlling the copy paper transporting unit and the image forming unit after reversing, and copying the image of the first side of the document positioned at the exposure position by the control of (4) to the copy paper (7) after the control of (6), the document inverting / transporting unit is controlled to invert the original and positioned at the exposure position; (8) the copy sheet reversing / transporting unit and the image forming unit Of the original positioned at the exposure position by the control of (7). Forming an image of the face to the second face of the copy sheet, duplex copying apparatus, characterized by the control. 2. The double-sided copying apparatus according to claim 1, wherein the copy sheet reversing / conveying section has a holding / conveying means for holding and stacking copy sheets one by one.