JPS587152A - Both side copying machine provided with automatic original feeder - Google Patents

Abstract

PURPOSE:To save waste of time, and to avoid occurrence of trouble, by sending the last copying paper which is not to be copied in making copies with a both side automatic copying machine using a single-side original, to the outlet of a copying paper after the completion of copying on the surface without executing a normal copying cycle to obtain this blank copy. CONSTITUTION:A first sensor for detecting presence of an original G on an original tray 2 and a second sensor 14 for detecting presence of a sheet on a buffer tray 13 send each sheet detection signal to a controller 15. The controller 15 sends signals for operating branch gates 9, 90, etc., when the contents of the signals of the sensors 1, 14 show both the absence of the sheet, changing the cource of the copied paper to deliver it to a paper discharge cource 11A or that 11B.

Description

[Detailed description of the invention] 11 The present invention relates to a double-sided copying machine with an automatic document feeder.

4. Automatic document feeder and double-sided copying machine. - Conventionally, when this is set to double-sided copy mode, both sides of the transfer paper are necessarily copied due to its function. Therefore, for example, even if there is no document of the corresponding size and the back side is a blank sheet, double-sided printing is performed, the transfer paper comes into contact with the photoreceptor, and the transfer paper contacts the photoreceptor,
After the ii image is transferred, it undergoes a fixing process and is then discharged.

However, the series of processes related to so-called blank paper removal (a) for transferring the white image are essentially unnecessary.

Conventionally, problems have arisen due to the fact that the copying process must always be automatically executed on both sides of the transfer paper.

This is because the 1-recycle of the useless copying process is executed because of this blank paper J (Y), and due to this, small gaps occur and errors occur as a result of transferring the white image. This is because the upper row of the probability of occurrence of troubles such as jams due to the movement (transportation) of the transfer paper can be seen.

Regarding typical specific examples in which the above-mentioned blank page removal is executed 2
Let me introduce an example.

(]) If there are an odd number of originals, for example, as shown in Figure 1, three originals GI+G2+
G3, and how many manuscripts G1. G2. Only on each side of G3 is information P1. P2. Suppose that P3 is written and each opposite side of them is blank.

FIG. 2 shows the result of double-sided copying of such a document by passing it through a conventional double-sided copying machine equipped with an automatic document feeder.

That is, an image of information P1 is formed on one side of the transfer paper S1 and an image of information P2 is formed on the back side of the transfer paper S1, and an image of information P2 is formed on one side of the transfer paper S2.
3 is formed, and the back side thereof becomes a blank page because there is no corresponding document. However, this blank area is not just a blank sheet of paper, but is a blank sheet that has been copied from the plain white color of the copying machine's document pressure plate or conveyance belt, and has not undergone normal copying cycles, such as charging, exposure, development, transfer, and fixing processes. It may be formed through the same process as the copying cycle involved, or it may only be charged during the normal copying cycle.

(2) When there are multiple originals, for example, as shown in FIG. 6, there are four originals G1°02,
G3. G4, and each of these manuscripts G4. C2, G3. G
4 only on each side of the information P1. P2. P3. Suppose that P4 is written and each opposite side of them is blank. When such a document is copied on both sides and the side corresponding to the cover of the resulting copy is left blank, the side corresponding to the final page will also be blank.

FIG. 4 explains the situation, in which one side of the transfer paper S1 is blank to be used as a cover, and information P1 is copied on the back side. Also, regarding the transfer paper S2, information P2 is on one side and information P6 is on the back side of the transfer paper S2.
3, information P4 is copied on one side of each. Note that the back side of the information P4 printing surface on the transfer paper S3 is blank, but this blank part is
) When the number of original sheets is an odd number, the last page of blank paper is obtained through the same process as the normal copying cycle.

The present invention has been made in view of the above-mentioned problem, and when the last page of a copy becomes blank when double-sided automatic copying is performed using a single-sided original, the normal copying cycle is used to obtain the blank page. To provide a double-sided copying machine with an automatic document feeder which feeds the document to an IJ1 paper section after copying the front side without copying the front side.

The present invention will be explained in detail below.

The present invention includes a first sensor that detects the presence or absence of a sheet on a document tray, and a sensor that routes the copied transfer paper to either a paper ejection path that feeds it to a paper ejection section or a transfer path that feeds it to a transfer process section. The copying machine is equipped with a branch gate for switching and a buffer tray provided in the middle of the transfer path, and the buffer tray is equipped with a second sensor for detecting the presence or absence of a sheet on the tray. Therefore, during the copy cycle, when the detection signals from the first sensor and the second sensor are received, and both signals indicate that there is no sheet, the branch gate is activated so that the transfer paper does not return to the buffer tray. The present invention is characterized by having a branch gate control means for switching the mode.

Therefore, if the present invention is implemented, if the final page is blank, only one side of the transfer paper will be copied and then ejected as is.

In this way, it is possible to eliminate the wasted time of copying a blank sheet, which occurred in the prior art, and at the same time avoid the troubles associated with it.

In FIG. 5, reference numeral 1 indicates a first sensor that detects the presence or absence of a document G on the document tray 2. In FIG.

The transfer paper S before copying is stored on the paper feed tray and is waiting to be used for copying. During copying, the transfer paper S on this paper feed tray 3 is fed out by a paper feed roller 600, passes through a transfer path 4A, and passes between a photosensitive drum 5 and a transfer corona unit 6 provided in the middle of this path. At that time, the toner image is transferred. Thereafter, it passes through the fixing unit 7 and is fixed, reaches the reversing unit 8, is reversed at the core portion for page alignment, and then reaches the branch gate 9.

The branching game 1/9 has the function of switching the course of the transfer sheet S in two directions after copying θ). , one route is the paper discharge route +jA towards the paper discharge l/ray 1st, and the other route is the branch gate 9 (]/\ or 5 turn r! (r route 413).

Next, the branch gate? (] to 1, :Iji-1'lI'' Transfer σq# (of S) sent on route 4B
1, which has the function of switching the course in two directions, one θ))
(The ← path is the 54JI paper path 11B toward the sorter branching game I/12, and the other path is the 5 transfer path 4C toward the buffer tray 1.

A second sensor 14 is attached to the buffer part 2413 to detect the presence or absence of the sea 1 on the l ray.

The sheet detection signals of the first sensor 1 and the second sensor 14 are each transmitted by the control unit 1! It seems like it's being controlled by H)
. When the signal from the first sensor 1 and the signal from the second sensor 14 indicate that there is no sheet, the control unit 15 sends a signal to operate the branch goo 1-9, 90, etc., and transfers the copy paper after copying. The paper feeding route is switched to the paper route +iA or the paper discharge route 11B.

For example, if you want to obtain 1 copy as the number of copies, operate only the branching game 1-9 and change 1 corner to send it to the paper discharge l/ray 1o. In addition, when obtaining a plurality of copies, the branch gate 9 is switched to the transfer path 4B side, and then the branch gate 90 is switched to the Ju1 paper path 11BK and sent to the sorting bin 16. In addition, how many r) does the sorter branch cable 1 and 12 feed to the sorter turbine 16? 7
) It has a function of switching the course from the 5"l path toward the sorter-proof tray 17-\ toward the sorter-proof tray 17-\ when it is skewered, but it is not directly related to the present invention.

Regarding the operation of the branches 'y'-gates 9 and 9o, the following conditions apply.
When choosing , branching game I・90 l (, the path selection can be either of the above two paths. On the other hand,
The branch game 1-9 [] is the transfer path 4C or the paper discharge path jI.
When path B is intentionally selected, the branch gate 9 is controlled so that the transfer path 4B is always selected.

The above configuration achieves +71 objectives of the present invention.

For example, if you want to obtain a double-sided copy as shown in Figure 2 using the original as shown in Figure 1 above, place the original on the original tray 2 [2] so as not to disrupt the relationship shown in Figure 1. I will place it all. At this time, the information 11 side of the document G1 becomes the bottom side and comes into contact with the roller 18. Then, the first sensor 1 confirms that the original has been printed 71, and then presses the duplex mode instruction button 19 on the operation panel shown in Figure 6 to enter the duplex copy mode. (switching port).

Translate the transfer paper size to the desired size and specify the required number of copies (required number of copies if page alignment is required) using the numeric keypad 20. Furthermore, when performing automatic adjustment 4iii, press the two-tooth inch 22. When the sorting switch 22 is pressed, the copied transfer paper is placed in the sorting switch 16.
1, So! - If you do not press yf22, the paper will be ejected onto 4:11 paper I/ray 10.

By pressing the print star I/S2 inlet 21, the double-sided copying operation according to the present invention is started.

(1) ・[Seiko fiP1 + 1P manuscript G1 is
The toner image of the information P1 is transferred onto the contact glass 24 by the belt 23, and a toner image of the information P1 is formed on the IL body 5 through a normal electrophotographic process. At the same time, when the transfer paper on the paper feed tray, for example, the transfer paper S1, is sent out via the transfer path 4A and passes through the transfer section 2I, the information P1 is After the toner image is transferred, the toner image is then fixed by a fixing unit 7, and further, the toner image is turned over at a reversing knuckle 8 and reaches a branch gate 9 in preparation for transfer of the back side. Here, although the detection signal of the second sensor 14 is "no",
The detection signal from the first sensor 1 is "sheet cured" and the branch gate 9 sends out the transfer paper s1 to the transfer path 4B. Also, since the branch gate 9o switches the course to the transfer path 4c according to the control force formula for normal double-sided copying, the transfer paper S1 is placed in the buffer tray 1 with one side facing up.
3” Second - old stocked.

In the same manner, enter J:su, Jh in advance on the numeric keypad 20.
The indicated number of sheets are transferred and stored on the buffer I-ray 13.

(2) Copying information P2 In this way, when the specified number of sheets (or number of copies) has been copied using the numeric keypad 20, all contacts 1 to 24
The original document C,, &:l:, which was on top, is ejected by the belt 26, and the original document +=G is instead fed into the contact glass 24]- with the information 22 side facing down. This manuscript G2
When the feeding of the paper S1 on the buffer tray 13 is detected by a sensor (not shown), an image of P2θ)l is formed on the photoreceptor drum 5, and this time, the transfer paper S1 on the buffer tray 13 is , the toner image of the information P2 is transferred to the reverse side of the printing surface of the information P1 as described above when the toner image of the information P2 is transferred to the transfer path 4A by the roller 25 and passes through the transfer corona throat part (A). After that, it passes through a fixing process and reaches the reversing unit Yl-8, where it is reversed in order to align the page order in the counter, and then a branch gate 9 sends it to the paper path ILA if the pages are not aligned for each number of copies. My career path has been selected.
If the page is to be aligned for each number of copies, the transfer path is selected as transfer progress 4B, and then branch gate 9 is sent.
0, the paper discharge path 11B is selected and the paper is delivered to the no turbine 16.

The control system and operation of the branch gates 9 and 90 in this case follow the control system and operation of normal double-sided copying.

Hereinafter, the same operation as above is performed for other transfer sheets on the buffer tray 16, so that the buffer tray 1
After information is printed on both sides of each sheet, the sheets are sent out onto the paper discharge tray 10 or to each sorting turbine 16. Therefore, the buffer tray 13 becomes empty, and from that point on, the second sensor 14 begins to send a detection signal of "no sheet" to the control unit 15.

(3) Copying information P6 After the above process completes printing on the last transfer paper waiting on the buffer tray 13 on which information P2 is to be printed, the original G2 is ejected by the belt 23. . Then, instead, the original G3 is set on the contact glass 24 with the information 23 side facing down. From this point on, the document tray 2 becomes empty, and the first sensor 1r) begins to send a detection signal of "no sheet" to the control section 15.

Therefore, the detection signals of the tenth sensor 1 and the twentyth sensor 14 both became "sheet out", and as a result, the path of the transfer paper was changed so that the transfer paper would not return to the buffer tray 13. The path is forcibly switched toward the paper ejection path +1A or the paper ejection path 11B, for example. This switching command is made by a signal from the control unit 11 15, and the branch group 1-
9.90 etc. is activated and switched.

Incidentally, if the above-mentioned command from the control section 15 had been given, the transfer paper would have been set to return to the buffer tray according to the normal double-sided copy control system 1.

Other than the above, the information P2 is successively transferred onto one side of the required number of transfer sheets, including the transfer sheet S2, in accordance with the process described in (1) Copying the information P1.

These transfer sheets are then fixed, then turned over by a reversing unit 8 to align the page order, and then delivered to the output tray 10 as is.
Alternatively, it is sent to the sorting turbine 16. In other words, after printing on one side, the sheet is immediately fed to the discharge section, and as in the past, the blank side is again transferred to the photoreceptor drum 5 with no toner image.
The wasteful process of idle transfer in contact with the image is not performed.

In this way, on the paper discharge tray 10 or on the sorting turbine 16
The required number of double-sided copies similar to those shown in FIG. 2 above can be obtained. Moreover, according to the accidental discovery, since the blank side of the transfer paper S2 is not in contact with the photosensitive drum 5 as in the conventional case, no dirt is deposited on it, and the paper is clean and blank.

The above was a case of obtaining a double-sided copy as shown in Fig. 2 using an original as shown in Fig. 1 above, but it is also possible to obtain a double-sided copy as shown in Fig. 4 using an original as shown in Fig. 3 above. This can be done similarly to the example above. However, since one side of the first transfer paper S1 in FIG. 4 is blank, it is necessary to manually copy only one side of it before starting the double-sided copying according to the present invention, and then Before entering double-sided copying or executing the double-sided copying mode according to the present invention,
It is possible to set the radical process so that one-sided copying is automatically performed and then the two-sided copying mode according to the present invention is taken over. Na”.・In the former case, it is exactly the same as the case of obtaining a copy of Figure 2 from the manuscript of Figure 1.
3c a).

(For reference) Fig. 5, Fig. 6 61 shows the configuration of a copying machine in which the conventional double-sided copying machine with a moving document feeder is added with functions and inexpensive parts related to the present invention. ．． Therefore, in the above description, names, functions, etc. directly related to IM are omitted.

Therefore, to supplement the explanation, I will list the names of strange parts that did not appear in the explanation.

Code 26: Automatic document feed unit, Code 27: Sorter Uninote, ♀ No. 1 28: Optical system lens + Code 29 nib r; Academic mirror, Code 30: Charged corona unit; -) l-
.

Sign slot 1: Clear switch t; ]: , l (4″3
2: Stomp switch, arrow 33 = interrupt switch, code 34: paper discharge l/ray sensor, sign slot 5: sorter output rotary tray sensor, sign slot 6: soak-bin storage sensor.

Code 37: Senoto number display, ? Te No. 1 38 = Copy end number indicator.

[Brief explanation of the drawing]

Figures 1 and 5 are respectively related to the present invention.A) A diagram showing an example of a group of originals to be copied by a copying machine, and Figures 2 and 4 are a diagram showing an example of a group of originals to be copied by a copying machine according to the present invention. A group of transfer paper is shown below.1. FIG. 5 is a block diagram of the automatic document feeder (I) double-sided copying machine according to the present invention, and FIG. 6 is a top view of the operation panel shown in the same figure.

Claims (1)

[Scope of Claims] A first sensor that detects the presence or absence of a sheet on original document 1, t/a, and a 4/1 paper path or transfer processor that feeds the copy paper after copying. The transfer path is equipped with a 5-branch 'r-l' and a buffer tray, etc. installed in the middle of the transfer path. and +'11' for the above-mentioned copying machine, which is equipped with a second sensor for detecting the presence or absence of sheets on the tray; 1st sensor and 2nd sensor
I'm sure the sensor detects it correctly. [U, when there is no sheet for both contents, the transfer paper returns to the buffer tray in the upper rj-: branch case 1"] I'c. 8 (1) features a branch game 1 and a 1-4 mode that can be switched to mode, and a 1-4 double-sided automatic document feeder.