JPS62231963A - Composite copying device - Google Patents

Abstract

PURPOSE:To selectively execute composite copying such as process color printing, and double copying for performing a copy processing to both faces of one sheet of copying form, by one set of copying machine, by switching selectively a carrying path of the copying form, which goes round a stock means, and a carrying path of the copying form which passes through the stick means. CONSTITUTION:A copying form carrying path for carrying a copying form whose one face is brought to transfer and fixation processings, once again to a resist roller 15 of a copying machine is connected to the downstream side of a fixing roller 18. Also, the copying form carrying path inverts the copying form which is fed out of the fixing roller 18, by 360 deg. and carries it again to the resist roller 15 of a feed paper part, and constituted of the first inversion duct, a carrying belt 24, and the second inversion duct 26. In such a way, the copying processing of a single sheet and the copying processing of plural continuous sheets can be executed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrostatic copying apparatus, and more particularly to a multifunction copying apparatus that is capable of copying a single sheet of paper two or more times. The present invention relates to a composite copying apparatus that is capable of efficiently copying a single sheet and copying a plurality of consecutive sheets using a single copying machine.

2. Description of the Related Art Conventionally, copying machines equipped with an editing function are generally known. This is a copying machine that independently controls the density of a part of the entire image, and in extreme cases can produce a partially mountainous image.
The one described in Japanese Patent No. 3459 is known.

In addition, a plurality of developers containing developers of different colors described in Japanese Patent Application Laid-Open No. 60-95457! a developing device, a selecting device for selecting one of these developing devices, and an image forming device for forming an image on an image forming body using the developing device selected by the selecting device, the image forming device The images of multiple originals are transferred to a single image forming object using different images!
An image forming device is known in which multiple images of different colors are formed by forming images separately using a device. By reversing the copy paper that has been copied on one side 360 degrees and feeding it again to the paper feed section (registration roller) of the copying device, multiple copies can be made on one side of a single sheet of paper. By performing this process and changing the color of the developer in this multiple copying process, it is possible to automatically perform multicolor copying.

On the other hand, Japanese Patent Application Laid-Open No. 53-108436 discloses that sheet-like double-sided originals are arranged in page order from top to bottom and placed on a first tray, then taken out sequentially from the top of the first tray, and the back side is removed. Expose, invert and place on the second tray,
After exposure from one direction is completed, the reversed originals are sequentially taken out from above the second tray, the front side is sequentially exposed from the opposite direction, the reverse side is placed on the first tray, and at the same time the back side of the original is placed on the top surface of copy paper. A copying method is described in which double-sided copying is performed using a sheet-like double-sided rrim in which the documents are reversed after being copied and sequentially placed on an intermediate tray, and then the front surface of the original is discharged onto the reversed upper surface after being copied. Japanese Unexamined Patent Publication 1986-1960
No. 763 also discloses a copying apparatus for double-sided copying.

Problems with the Prior Art However, the image forming apparatus described in the above-mentioned Japanese Patent Application Laid-Open No. 60-95457 can only perform multicolor printing on one side of copy paper;
Even if the editing function described in Japanese Patent No. 93459 is added, editing and copying operations can only be performed on one side of copy paper.

In addition, the above-mentioned Japanese Patent Application Laid-open No. 108436/1982 and Japanese Patent Application Laid-open No. 5
In the double-sided copying method described in Publication No. 8-60763,
It is only possible to perform double-sided copying, and it is not possible to arbitrarily switch between double-sided copying and single-sided multiple copying (multicolor printing, editing operations, etc.), which is the purpose of the present invention, with a single copying machine. There was a drawback that a separate copying machine was required to have each function.

Furthermore, in the conventional technology described above, an intermediate tray for temporarily docking a large number of copy sheets is provided, assuming that a large number of double-sided copies or multiple copies (herein, both are referred to as composite copying) will be performed. Copy paper is temporarily stored in this intermediate tray during compound copying, but it is also necessary to temporarily store copy paper in this intermediate tray even when performing compound copying of only one sheet, for example. Since the copy paper temporarily stagnates in this intermediate tray, there is a disadvantage in that it is extremely disadvantageous in terms of the efficiency of the copying process.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a composite copying apparatus capable of efficiently copying a single sheet and copying a plurality of consecutive sheets.

Structure of the Invention In order to achieve the above object, the main means adopted by the present invention is to temporarily copy copy paper that is equipped with an electrostatic copying function and that has undergone transfer and fixing processing on one side. In a copying apparatus having a stocking means for stocking a sheet of paper, the stocking means is operated based on a signal for re-transferring and fixing copy paper that has been subjected to transfer and fixing processing on one side and a signal for a set number of copies. This is a copying apparatus that selectively switches between a detouring copy paper forwarding path and a copy paper conveyance path passing through a stocking means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings to provide an understanding of the present invention.

FIG. 1 is a schematic side view of the entire copying apparatus according to an embodiment of the present invention, and FIG. 2 is a side view showing details of a first path switching means that can be used in the embodiment. 3 is a flow block diagram showing the control procedure of the same embodiment, FIG. 4 is an enlarged view of the section viewed from the ■ arrow in FIG. 1, and FIG. 5 is an enlarged view of the section viewed from the ■ arrow in FIG. 4. .

Note that the following examples are merely examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

In FIG. 1, reference numeral 1 denotes a document table made of contact glass, which holds and fixes the document between it and a document presser 2. As shown in FIG. The document placed on the document table 1 is exposed and scanned by a light source 3 provided below the document table 1, and the light emitted from the light source 3 is transmitted through the mirrors 4B, 4b and 4b, as shown by the dashed line in the figure. 4
c, the photoreceptor 7 is irradiated via the lens 5 and the mirror 6. During main charging, 8. A transfer charger 91 and a separation charger 10 are provided.

In addition, the main charger 8 and the transfer charger 9
Two developing devices 11.511b containing toners of different colors for two-color printing are arranged between the developing devices 11.511b of 21[1]. .

! As a method for controlling the contact and separation of the photoreceptor 7 for 1 hour, for example, the same type of method as described in the above-mentioned Japanese Patent Laid-Open Publication No. 60-95457 can be used.

Further, between the developing device IL and the main charging medium 8, and downstream from the irradiated portion when viewed in the rotational direction of the photoreceptor 7, an electrostatic latent image formed on the photoreceptor 7 is controlled. An image density control device 12 is provided which performs editing functions and the like. This image density control device 12 may be of the same type as that described in Japanese Patent Application Laid-Open No. 59-93459.

13 is a cleaning device provided downstream of the separation charger 10.

The copy paper is stored in a copy paper cassette 1 inserted into the front of the copying machine main body A that houses the photoreceptor 7 etc. as described above.
4 to paper feed roller 14. The transport path 16
and then reaches the registration roller 15. After the copy sheets are aligned here, the original image is transferred when they pass through the transfer section 9° between the transfer charger 9 and the photoreceptor 7, and after being separated by the separation charger 10, The conveyance belt 17 leads to a fixing roller 18 provided at the front in the direction of conveyance of the copy paper. When the first and second switching guides 23m and 23h, which will be described later, are in the positions indicated by solid lines in FIG. be done.

Next, referring to FIG. 1, an example of a copy paper transport path for transporting copy paper that has been subjected to transfer and fixing processing on one side, which is a main component of the present invention, to the registration rollers 15 of the copying machine again. explain. In this embodiment, this copy paper conveyance path is tIIVt on the downstream side of the fixing roller IB, and is an example of a paper feeding section where the copy paper sent out from the fixing roller 18 is reversed 360 degrees and reused. In this embodiment, a first reversing duct 22 (to be described later)
．． Conveyor belt 24. It is constituted by a second reversing duct 26.

As shown in detail in FIG. 2, on the downstream side of the fixing roller 18, there is a guide duct 1 for temporarily storing a sheet of copy paper sent out from the fixing roller 18.
9, and a guide roller 2o that grips the copy paper inserted into the guide duct 19 and feeds the copy paper toward the tip or base of the guide duct 19, and the base of the guide duct 19 includes: The leading edge of the copy paper sent out from the fixing roller 18 is guided toward the guide duct 19, or the paper ejection roller 2
The first switching guide 23 determines whether to direct the direction in the first direction.
．． is provided.

The reversing duct 22 is branched and connected in the middle of the conveyance path 1 □ that connects the first switching guide 23 and the paper ejection roller 21 . A second switching guide 23 provided at the branching point between the conveyance path 1B and the reversing duct 22 changes the traveling direction of the copy paper sent out from the fixing roller 18 to the direction of the first switching guide 231. The direction of the reversing duct 22 is selectively switched.

Further, the guide duct] 9 is linearly connected to the reversing duct 22 via a connecting duct 223, and a linear passage connecting this guide duct 19 and the connecting duct 228 and the general passage 18. intersect with the second switching guide 23b at a downstream side when viewed in the copy paper conveyance direction.

Said first switching guide 23. are provided at this intersection, and guide the copy paper coming out of the fixing roller 18 in the direction of the paper ejection roller 21 in the state shown by the solid line in FIG. 1, and the first switching guide 23. When is in the position shown by the two-dot chain line, the copy paper coming out of the fixing roller 18 is guided toward the guide duct 19. Further, the copy paper temporarily stored in the guide duct 19 is transferred to the guide roller 1.
The first switching duct 2 is at the position indicated by the two-dot chain line due to the rotation of 0.
3. and transported to the reversing duct 22. however,
Such a first switching guide 23. is the second switching guide 23
It is also possible to use both I and I. In this case, the second switching guide 23. would consist of a guide that can be switched in three directions.

Note that 201 to 20J are feed rollers for conveying the copy paper, and during the copying process, they always rotate in a fixed direction to convey the copy paper.

Reference numeral 24 denotes a reversing conveyor belt connected to the first reversing duct 22, which guides the copy paper that has been guided and conveyed by the first reversing duct 22 in the direction of the second reversing duct 26. A third switching guide 25 for switching the traveling direction of the copy paper transported by the reversing transport belt 24 is provided downstream of the reversing 1M transport belt 24 in the transport direction. Figure 2
When in the position shown by the dotted chain line, the reversing conveyor belt 24
The copy paper sent out is guided to the registration roller 15 through the second reversing duct 26.

Further, when the third switching guide 25 is switched to the position shown by the solid line in the figure, the copy paper sent out by the reversing conveyor belt 24 is transferred to the guide plate 2.
7 and fed into a paper feeding cassette 28 which constitutes a stocking means.

This paper feeding cassette 28 is equipped with a feeding roller 30 at the downstream end in the feeding direction. When the copy paper is being carried into the cassette 28, the feeding roller 30 is moved away so as not to get in the way, or is moved downward on the cassette plate 31 side as described below, or is moved in the direction in which the copy paper is carried. be retired to.

This paper feed cassette 28 serves as a stocking means for temporarily stocking copy sheets that have been transferred and fixed as described above, and can also serve as a normal paper feed cassette. However, if it does not function as a normal paper feeding cassette but only functions as a so-called intermediate tray, it can also be built inside the main body of the copying machine.

A fourth switching guide 29 is provided between the guide plate 27 and the paper feeding cassette 28.
As shown in FIG.
A solenoid box 32 containing a solenoid for driving the guide plate 27 is provided below the guide plate 27.

The structure of the solenoid box 32 and its surroundings will be further explained.

As shown in FIG. 4, the solenoid box 32 includes a first solenoid 33 connected to the third switching guide 25, a second solenoid 34 connected to the fourth switching guide 29, and the cassette plate. A third solenoid 35 is provided which acts to move 31 downwardly by a small amount.

The armature of the first solenoid 33 is always urged downward by a spring 36.
3 is energized, it moves upward and completely switches the third switching guide 25 from the position shown by the solid line in FIG. 1 to the position shown by the two-dot chain line.

As shown in FIG. 4, the armature of the second solenoid 34 is always urged downward by a spring 37 provided between it and the guide plate 27, and when the second solenoid 34 is energized, the lever is 3. Move the fourth switching guide 29 connected by 2 from the position shown by the solid line in FIG.
Switch to the position shown by the dotted chain line. The paper feeding cassette 2
8 and the registration roller 15, a conveyance guide 39 constituting a part of the temporary sudock means is provided.
By switching the switching guide 29 to the position shown by the two-dot chain line, the copy paper sent out from the paper feed cassette 28 is guided to the fourth switching guide 29,
Double feed prevention roller 28I.

The image is supplied to the registration rollers 15 through a conveyance guide 39 provided with.

The cassette plate 31 is for pressing the copy paper inserted into the paper feeding cassette 28 against the feeding roller 30, and is constantly pressed in the direction of the feeding roller 30 by a cassette spring 40, as shown in FIG. energized. Also,
The tip of this cassette plate 31 constitutes a protrusion 41 that passes through the end opening 28° of the paper feed cassette 28 and projects toward the third solenoid 35. An actuating member 42 having a sawtooth engagement end facing the projection 41 is provided to protrude from the solenoid box 32 toward the paper feeding cassette 28 . This actuating member 42 and the armature of the third solenoid 35 are connected to the fulcrum 4
When the third solenoid 35 is energized and its armature is drawn into the third solenoid 35, the link 44 rotates clockwise around the fulcrum 43 in FIG. The sawtooth end surface of the actuating member 42 is pressed against the protrusion 41 of the force centering plate 31, and the protrusion 41 descends along the tapered portion of the sawtooth end surface, and the cassette plate 31 is pushed down. The copy paper inserted between the cassette plate 31 and the feeding roller 30 or on the cassette plate 31 and the feeding roller 3
0, a small amount of space is formed between the two. As described above, since the end surface of the actuating member 42 is saw-shaped, the third solenoid 35 is actuated so that the lower part of the paper feed roller 30 is A small gap is formed between the two.

The saw-shaped end surface of the operating member 42 and the tip shape of the protrusion 41 that engages with the saw-shaped end surface are the 51st! It is desirable to have the one shown in FIG.
When the third solenoid 35 is activated, the tips of the protrusions 41 first come into contact with the inclined surfaces 42, . 42. , . . . and inclined surfaces 42h, 42b, . . . with relatively gentle angles (α2) formed therebetween.
It is composed of... Further, the tip of the protrusion 41 is gently bent at an angle parallel to the inclined surface 42 having the gentle angle (α2), and the top portion 42c forms a slope having an angle α.

Therefore, as shown in FIG. 5, the protrusion 41 is as shown by the solid line.
When it comes into contact with a relatively upper portion of a certain slope 428', the protrusion 41 is naturally pushed down by l in the vertical direction until it bites into the valley of the tip of the protrusion, as shown by the dashed line. Further, as shown by the two-dot chain line, when the actuating member 42 is pressed against the protrusion 41 in a state where the height of the top end 41' of the protrusion 41 is approximately equal to the height of the top end 42' of the saw blade, the protrusion 41 is +IJI of the steep angle (αI)!
``Ax (
83) is pushed downward a distance equal to the vertical height of the ramp 42). Such a 12-minute descent cannot be expected if the gently sloped surface 42 is horizontal.

Therefore, in this embodiment, by appropriately selecting the length of 12, no matter what height the protrusion 41 is, the cassette plate 31 can be lowered by at least 12 minutes by the operation of the third solenoid. New copy paper can be fed onto the already supplied copy paper (or cassette plate 31) without being obstructed by the feed roller 30.

The third solenoid 35 is turned on and off as described above each time one sheet of copy paper is fed.

Next, referring to FIGS. 1, 5, 2, and 3, the operation of the above embodiment using the microcomputer will be explained. Here, Sl, S2. ... is the number of the processing procedure.

Prior to copying, the operator can set the number of copies per document, automatic double-sided copying or composite copying (
The copy mode is set by operating a button on the operation pulse to determine whether to perform composite copying (combined copying) or to perform normal copy processing without performing any copying.

Then, when the operator presses the copy button,
The microcomputer determines whether or not to perform composite copying based on the various copy mode signals mentioned above (31).

If it is a composite copy (yes), use the reversing conveyor belt 2.
4 starts running (32).

Thereafter, if it is determined that the set number of copies is one (S3), the process for 315 or less copies is performed, and if it is determined that it is a plurality of copies, the process moves to 34 or less copies.

First, as an example of composite copying, 2
The case where the set number of copies is 2 or more in color printing copy mode will be explained.

For example, when developing only a predetermined rectangular part of a document in red and the surrounding part in black, the operator uses another operation key to instruct the copy process using the edit function, and also uses the numeric keypad to instruct the area to be copied in red. Specify.

Due to the designation of the two-color copy mode, the process proceeds to NO in S4, and the first switching guide 23° is set to 2 in FIG.
At the same time as the second switching guide 23t is rotated to the position shown by the dotted chain line (off position), the second switching guide 23t is switched to the on position shown by the solid line. Also the third. The fourth switching guides 25, 29 are both switched to the on position shown in solid lines. Third. Fourth switching guide 25
．． The rotation of 29 is the same as that of the first. 2nd solenoid 33.34
The other switching guides are also driven by another solenoid (not shown).

Also, at this point, the third solenoid 35 is energized, and the saw-shaped end surface of the actuating member 42 is aligned with the protrusion 4 of the cassette plate 31.
If copy paper is loaded between or between the cassette plate 31 and paper feed roller 30, a small gap will be formed between the top layer of copy paper and the paper feed roller 30 ( 35).

In this state, the copying process is started when the copy paper in the cassette 14 reaches the paper feed roller 14. (see Fig. 1), and the tip thereof is sent out to the conveyance path 16 by the registration roller 1.
5 and stops.

This is followed by a light source 3 and a mirror 4. 4e begins to move, and the light reflected from the document sandwiched between the document table l and the document presser 2 is reflected by the mirror 4. 4c, the light reaches the lens 5, is further reflected by the mirror 6, and is irradiated onto the photoreceptor 7. As the light source 3 moves, the photoreceptor 7 rotates in the direction shown by the arrow, and a latent original image is formed on the surface of the photoreceptor 7. Initially, a portion of the black copy is masked. Since the copying process is performed by the image density control device 12, the charge is removed from the areas other than the designated red V1 area by the action of the image density control device 12, and the developing device 11. The red toner stored inside is applied.

When the photoreceptor 7 rotates by a predetermined angle in this way, the registration roller 15 starts rotating from that point on, and the copy paper fed out by the registration roller 15 is transferred to the transfer portion 9. Transfer processing is performed in . Further, the copy paper is separated by a separation charger 10, passes through a conveyor belt 17, and reaches a fixing roller 18, where it is fixed.

The copy paper that has been subjected to the fixing process by the fixing roller 18 is
Guided by the first switching guide 23&, which is switched to the dotted chain line position (off position), it enters the guide duct 19, and its tip is eventually gripped by the guide roller 20 rotating in the normal rotation direction, and the guide duct is closed. 19 is sent toward the tip.

When the copy paper has entered the guide duct 19 over its entire length, the rotation of the guide roller 20 is stopped by a signal from an optical sensor (not shown) that detects this, and the copy paper is moved into the guide duct 19. temporarily fixed.

After that, the guide roller 20 starts rotating in the opposite direction to the direction indicated by the arrow (S7), and the gripped copy paper is moved to the first
It is sent out in the direction of the reversing duct 22.

The fed copy paper is moved by the first switching guide 23°.
Since it is located at the position shown by the two-dot chain line, it is guided by this and inserted into the first reversing duct 22 via the connecting duct 221, and is eventually conveyed to the first general conveyance belt 24 and guided in the direction of the third switching guide 25.

Since the third switching guide 25 has been switched to the position shown by the solid line in the figure, the copy paper maintains a straight forward state and advances along the guide plate 27 in the direction of the fourth switching guide 29. Copy paper is conveyed via a paper feed cassette 28, which is an example of stock means.

Since the fourth switching guide 29 has been switched to the position shown by the solid line in the figure, the copy paper moves along this and is moved between the paper feed roller 30 and the cassette plate 31 or the copy paper placed thereon. It is inserted into a small gap in the

When the insertion of the copy paper into the above gap is completed, the third
The solenoid 35 becomes de-energized, and accordingly, the saw-shaped end surface of the actuating member 42 is separated from the protrusion 41 of the cassette plate 31, and the cassette plate 31 is moved in the direction of the paper feed roller 30 by the biasing force of the cassette spring 40. The copy paper inserted earlier is pressed against the paper feed roller 30.

The insertion of copy sheets into the paper feed cassette 28 from the above copying process is repeated for the set number of copies (38).

This is what is called editing processing by trimming, and then the process moves on to masking processing in which only the periphery of the trimming is copied to black.

Next, the second solenoid 34 is energized, and the fourth switching guide 29 is switched to the position shown by the solid line in the figure (off position), and the first switching guide 23□ is switched to the on position. Further, the third solenoid 35 is turned off, and the copy paper is pressed against the feeding roller 30 (S9).
Thereafter, the copying process (SI
O) is started, and the pressed copy paper is guided by the third switching guide 29 and inserted into the conveyance guide 39.

As described above, the progressive guide 39
The copy paper traveling through the transport guide 39 eventually gets its leading end inserted into the registration roller 15 and stops.

Next, the light source 3 performs exposure scanning of the document again, and an image of the document is formed on the surface of the photoreceptor 7. At this time, the static electricity is removed only from the predetermined red copy area by the action of the image control device 12. The black toner contained in the developing device 13 is applied to the other portions, and development is performed using only the black toner. That is, at this time, the red developing device 11m is moved toward and away from the drum, and the black developing device Llb is brought close to the drum.

When the photoreceptor 7, on which the toner image has been formed with black toner, rotates to a predetermined position, the registration roller 15 starts rotating at that point, and the second transfer onto one side of the copy paper in the transfer section 91 is performed. A transfer process is performed, and black toner is attached to the black area.

Thereafter, the copy paper is separated and transported by the transport belt 17, and the copy paper arrives at the fixing roller 18.

The copy paper that has undergone the fixing process by the fixing roller IB is transferred to the first copy paper that is in the on state. Second switching guide 23, . 23b
The paper is guided through the conveyance path 181, passes through the paper ejection rollers 21, and is ejected to the paper ejection tray 45.

This copying process to the black area is repeated for all copies (311).

In the above operation description, we have described the automatic two-color copying operation for multiple sheets using the edit function, but it goes without saying that the above embodiment can be applied almost as is to multicolor copying operations that do not use the edit function. stomach.

Next, regarding the operation of automatically copying a plurality of double-sided copies of one original I1% sheet, the differences from the copying operation for two-color printing described above will be mainly explained.

If the answer is YES in step S4, an automatic double-sided copy program is executed.

During the surface copying operation in the double-sided copying operation, the second switching guide 23 is switched to the off position, the first switching guide 23□ is turned on, and the third solenoid 35 is turned on (S l 2). Regarding the copy process (
The copy paper subjected to step 313) is fed from the fixing roller 18 through the first reversing duct 22 - Ill transport belt 24 - third switching duct 25 (ON) - guide plate 27 - fourth switching duct 29 (ON). The sheets are fed into the cassette 28, and the above copying process is performed for the set number of sheets (324).
.

The copying process for the back side starts from here, and when the original is replaced and the copy button is pressed, the second switching guide 231. is on, the fourth switching guide 29 is off,
Furthermore, when the third solenoid 35 is turned off (S9) l&, the uppermost layer of copy paper in the paper feed cassette 28 is fed to the registration roller 15 by the feed roller 30.

Next, the registration rollers 15 rotate, and the new original image formed on the surface of the photoreceptor 7 is transferred to the back side of the copy paper.

When the transfer work is performed on the back side in this way, as mentioned above, the first . Since the second switching guides 23 and 23i have been switched to the on position shown by the solid line, the copy paper that has been sent by the conveyor belt 17 and has been fixed by the fixing roller 18 is ejected via the ejecting roller 21. It is discharged to tray 45 (SIO).

S9 mentioned above. The process of SlO is repeated for the set number of copies (Sll), and all copying processes are completed.

The above explanation was about making multiple copies from one original, so the copy paper that has been copied once is temporarily stored in the paper feed center 28, which is an example of a stocking means. and then the back side (double-sided copy)
Alternatively, copy processing to the same side (composite copy) is performed sequentially to improve the efficiency of the processing.

However, one double-sided copy from one original or
When making composite copies, temporarily stocking copy paper in the paper feed cassette 28 (intermediate cassette) as described above may not necessarily be an efficient process due to the time loss required for this temporary stocking. Since this cannot be said to be the case, a conveyance route that bypasses the paper feed cassette 28 is searched for.

The steps from step 315 described below are for such single-sheet copying. In order to simplify the explanation, points that are different from the steps S4 to S14 already described will be explained with particular emphasis.

In step S3 described above, if it is determined that the set number of copies is one, the process moves to S15 and subsequent steps. First, automatic double-sided copying of a single sheet will be explained.

In step S15, it is determined whether or not the process is in automatic double-sided copy mode. If YES here, the first switching guide 23. to the off position, and the second
The switching guide 23h is switched to the on position, and the third switching guide 25 is further switched to the off position. As a result, the copy paper conveyed by the conveyor belt 24 bypasses the temporary sudock means constituted by the paper feed force center 28 and the like.

and directly through the second reversing duct 26 to the registration roller 1.
5 (316).

In this state, S6. The same copying process as S7 and the forward rotation and subsequent reverse rotation of the guide roller 20 are performed (317).
, 18), the copy paper discharged from the guide duct 19 is transferred to the first reversing duct 22° conveyor belt 24. It reaches the registration roller 15 via the second reversing duct 25.

In this way, if it is determined in S19 that the copy paper has arrived at the registration rollers 15, the first switching guide 231 is switched from off to on (S20), and the copy paper currently stopped on the part of the registration rollers 15 is switched from off to on (S20). Perform the copy process to the end. As a result, double-sided copying of the front and back sides is completed, and the copy paper is discharged from the paper discharge roller 21 to the paper discharge tray 45 (S2
1).

Further, if it is determined in step 315 that the current mode is composite copy mode, in step S22, the first switching guide 238 is turned on and the second switching guide 23 is turned off, so that the fused copy paper is sent directly from the second switching guide 23 to the first reversing duct 22 (
(bypassing the guide duct 19), and once the copying process (52
3) The copied copy paper is sent from the conveyor belt 24 to the registration rollers 15 via the second reversing duct 26, bypassing the paper feed cassette.

The subsequent second copying process for the same surface is performed by repeating the steps 319 to S21 already described.

When copying a single sheet in this manner, the paper feed cassette 28, which is an example of an intermediate cassette, is bypassed and double-sided copying or composite copying is performed, which improves the efficiency of the copying process.

Effects of the Invention As described above, the present invention provides a copying apparatus having an electrostatic copying function and a storage means for temporarily stocking copy paper that has undergone transfer and fixing processing on one side. Based on a signal for re-transferring and fixing the copy paper that has undergone the transfer and fixing process, and a signal for the set number of copies, a copy paper conveyance path that bypasses the stocking means and a conveyance path for the copy paper that passes through the stocking means are provided. Since this is a multifunction copying machine that selectively switches the transport path of copy paper, it is possible to perform composite copying such as multicolor printing and double-sided copying that performs copy processing on both sides of a single copy paper using a single copying machine. In addition to making it possible to make multiple copies of a single original,
Further, even when making a single copy, the copying process can be performed using the shortest feeding path suitable for each mode, so the efficiency of the copying process is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the entire copying apparatus according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing details of a first path switching means that can be used in the embodiment. ,
FIG. 3 is a flow block diagram showing the control procedure of the same embodiment;
Figure 4 is an enlarged view of the part shown by the ■ arrow in Figure 1, and Figure 5 is the 4th section.
It is an enlarged view of the part shown by the ■ arrow in the figure. (Explanation of symbols) 11. 11b...Developing device 12...Image density control device 14...Cassette 15...Register roller 1
6... Conveyance path 17... Conveyance belt 19.
... Guide duct 20 ... Guide roller 20, ...
・Transport passage 22...first reversal duct 23,...
First switching guide 23I... Second switching guide 25... Second switching guide 26... Second reversing duct 27... Guide plate (stock path) 28...
Paper feed cassette (stock means) 29...Fourth switching guide 30...Feeding roller 31...Cassette plate 32...Solenoid boxes 33-35...First to third solenoids 39...・Transport guide 40...Cassette spring 41...Protrusion
42... Operating member 44... Link.

Claims (2)

[Claims] (1) Equipped with electrostatic copying function, transfer on one side,
In a copying device that has a stocking means for temporarily stocking copy paper that has undergone the fixing process, a signal for re-transferring and fixing the copy paper that has undergone the transfer and fixing process on one side, and a signal for setting the number of copies to be made. A multifunction copying apparatus characterized in that, based on a signal, a copy paper conveyance path that bypasses the stock means and a copy paper conveyance path that passes through the stock means are selectively switched. (2) The signal for transferring and fixing the copy paper that has been subjected to transfer and fixing processing on one side again is a signal for performing automatic double-sided copying or a signal for performing composite copying. Multifunction copier.