JPS62206562A - Copying apparatus - Google Patents

Abstract

PURPOSE:To suppress a generation of a winding jam by copying an image at a specific image forming range not contg. an image tip of the copying paper, eliminating the specific image forming range contg. the image tip of the copying paper at the time of the first copying, thereby preventing the adhesion of a toner at the image tip of the copying paper. CONSTITUTION:An outside range C-1 of the copying paper 20 as shown by the figure B in case of enabling the elimination at optionally specific range, is specified to the specific range as the subject of eliminating in the 1st copying, whereby the A-1 part in the inside range C-2 of the image A is copied using a black toner. Thus, in the 1st image forming, a latent image existing at the outside range C-1 is eliminated, controlling an eraser lamp 36 so as to eliminate the outside range C-1 at the time of the 1st image forming by means of the eraser lamp controlling apparatus 103, whereby the toner does not stick at the prescribed part in developing. The generation of jam due to an adsorption is depressed, as the toner does not stick at the image tip 20A which is apt to generate extremely the winding of the copying paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in the Cfl Industry] The present invention relates to a copying apparatus, and more particularly, the present invention relates to a copying apparatus having an automatic color multiplexing or duplex mode function capable of copying selected specific areas of a document in different colors. The present invention relates to a copying apparatus.

(Prior Art) Conventionally, in this type of copying apparatus, during the first cycle of multiple copying, the leading edge of the copy paper is attracted to the fixing device during image formation, resulting in a wrapping jam. The problem was that it was easy to do.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to address the above-mentioned problems and provide a copying apparatus that has the above-mentioned functions and that prevents copy paper from jamming around a fixing device during image formation. It is in.

(Means for Solving the Problems) In order to achieve the above object, the present invention specifies a specific area of a document, and colors the specific area and outside the specific area at corresponding positions on a copying material. This is a copying device that can perform multiple or double-sided copying, and has means for erasing images in a specific area or outside the specific area, and means for transferring images in the specific area or outside the specific area onto copying material. Or, before the transfer during the first copy of double-sided copying, the erasing means erases the image in the specific area or outside the specific area, whichever area includes the leading edge of the copying material, and then transfers the image in the other area. It is characterized by being made to do.

[For production]

In a copying apparatus configured in this way, when attempting to make multiple copies or double-sided copies of a selected specific area of a document in different colors, the image of the specific area including the leading edge of the copy paper is copied in the first cycle. By forming a copy image for that specific area in the second cycle, toner is not attached to the edge of the copy paper, and
This makes it possible to prevent the occurrence of jamming around the fixing device.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 shows a double-sided copying machine equipped with an automatic document feeder (RDF) and a sorter as an example to which the present invention is applied, and in this example, it is possible to implement double-sided copying and multiple copying modes as copying modes. Furthermore, in addition to automatic magnification and automatic cassette selection, it also has a function that allows for erasing latent images in specific areas. Here, 1 is an automatic document feeder (RDF), and 2 is a document tray.The document 3 set in the RDFI is operated by an operation unit 4, which will be described in detail later, for example, to make a double-sided copy from both sides of the document 3. If so, such a command is input using the key, the number of copies is set, and if it is a black copy, the black developing unit 5 is designated from among the developing units as shown in the figure, and the copy key is pressed. A press causes such an operation to proceed. In the following, double-sided copying is performed.

6A, 6B and 6C are original documents 3 sent from RDFI
R is provided to send the document onto the glass document table 8 by the conveyor belt 7 or to turn the document 3 upside down.
DF path, 6D is the document paper 3 from the document table 8 to the document tray 2.
This is a paper pass to return the item. In this way, the original guided onto the original table 8 is read by a reading device disposed on the lower surface side of the original table 8.

Reference numeral 9 indicates an illumination lamp thereof, and reference numeral 10 indicates a first scanning mirror. The moving speed ratio is 2 to the moving speed of the second scanning mirror 12 and the third scanning mirror 13.
It is meant to be kept double. 14 is a sensor for setting the moving optical system 11 to the reference position; 15 is a document edge position (image edge) detection sensor;
is the detection unit 16 attached to the holding frame of the moving optical system 11.
is detected when it passes the corresponding position of this sensor 14, and after the detection, a predetermined time T
1, the registration roller 17 is driven, and the upper cassette 18
Alternatively, it has the role of guiding the copy paper 20 selectively sent out from the lower cassette 19 to the photosensitive drum 21 at accurate timing and aligning the leading edge of the latent image on the drum 21 with the leading edge of the copy paper 20.

Returning to the reading optical system again, 22 is a document detection lens;
23 is a detection element, 24 is a projection lens, and includes the above-mentioned moving optical system 11 and second and third scanning mirrors 12.
Scanning is performed while the optical path length in front of the document detection lens 22 etc. is always kept constant by the relative movement of the document detection lens 22, and the reflected light image is formed on the detection element 23.
The formed image can further be formed on the photosensitive drum 21 via the projection lens 24 and the 4-mirror 25.

Next, the explanation will be continued in relation to the transfer and fixing device for copying.

The photosensitive drum 21 is formed of a seamless photosensitive member whose surface uses ASI, and is driven at a predetermined timing and speed. When the power is turned on by the power switch 30, the fixing device 31 is then turned on. The photosensitive drums 21 are not driven until a predetermined temperature is reached, and when the temperature reaches a predetermined temperature, the main motor 32 rotates the photosensitive drums 21 together with the transport units 33A, 33B, and 33G in the directions indicated by the arrows. Then, when the fixing device 31 reaches a predetermined standby temperature, the main motor 32 stops all at once, and enters a standby state waiting for a copy start signal.

Thus, as the drum 21 rotates in the direction of the arrow, it is first neutralized by the pre-exposure lamp 34, then corona-charged to, for example, 0+'' by the primary charger 35, and then irradiated with the illumination lamp 9 to remove the charge from the original paper 3. The captured image is exposed to light on the drum surface to form an electrostatic latent image.However, during scanning to detect the document size,
The latent image is erased by the eraser lamp 36, and by removing the AC component of the developer bias, the DC component is applied, thereby preventing toner adhesion.

Note that during document size detection scanning, the reflected light from the document 3 on the document table 8 is manually applied to the document size detection element CCD 23, and the reflected light from the area where the document 3 is not present is much larger than the area where the document 3 is. The size of the document is detected through the CCD 23 by making the image weaker.

When the document size detection (CCD processing) is completed, an electrostatic latent image is formed as described above, and then the specified developer (
In this example, it is visualized by either 5 or 37).

On the other hand, paper is fed by the paper feed roller 40 from the paper feed port of the cassette specified by the manual feed cassette 38, the upper cassette 18, the lower cassette 19, and the deck 39, and is fed just before the registration roller 17. Since the copy paper 20 is conveyed until the
By driving the registration roller 17 after a preset time T1 after the detection unit 16 of the moving optical system 11 is detected by the image edge detection sensor 15, the copy paper 20 is
The leading edge of the latent image on the photosensitive drum 21 can be aligned with the leading edge of the latent image on the photosensitive drum 21.

Thus, while the copy paper 20 passes between the transfer charger 41 and the drum 21, the toner image is transferred from the drum 21, and is separated from the drum 21 at the next separation charger 42. Note that 43 is a toner cleaning device, and the drum 21 after the transfer is cleaned of toner, and the pre-exposure lamp 34 is used to equalize potential unevenness.

The copy paper 20 separated from the photosensitive drum 21 is guided to the fixing device 31 by the first conveyance unit 33A, and after being fixed there, is guided by the flapper 44 to the side of the duplex unit 45 in the case of double-sided copying and multi-sided copying. In the case of single-sided copying, the paper is controlled so that it is guided to the output tray 46 side of the sorter.

47 is a paper ejection roller. In the case of double-sided copying, the copy paper led to the duplex unit 45 passes through the second conveyance unit 33B, the switch 48, and the third conveyance unit 33G, and is temporarily stored in the intermediate tray 49 in an inverted state.

On the other hand, in the case of double-sided copying, the original 3 set on the original platen 8 must be reversed and reset in order to copy the original image on the back side. This reset is RDF bus 6^
, 6B and 6C by switchback operation. Therefore, in the case of double-sided copying, after the document 3 is turned over in this way, the copy paper stored in the upside down state in the intermediate tray 49 is transported to the fourth conveyor by the paper feed roller 50 provided below. It is sent out toward the unit 330 and guided again to just before the registration roller 17.

Thus, after this, copying on the back side is performed in exactly the same manner as in the previous copying process, and the copy paper that has been fixed is led to the paper ejection roller 47 side by the control of the flapper 44 and ejected to the tray 46. , the double-sided copying operation is completed. Note that the document 3 is discharged from the document table 8 onto the document tray 4 via the paper bus path 6D.

The configuration of the recording apparatus has been described above, mainly focusing on the operation in the double-sided copying mode, and next, the basic procedure and operation in the case of multiple copying will be described.

First, after setting the original for the first copy in the RDFI, input the key to specify multiple copies on the operation section 4, and then specify the number of copies to be made and the developer to be used among the multiple developers. and manually press the copy start key. Through the above operations, the original set on the RDFI is guided onto the original platen 8, and in the same manner as described above, an electrostatic latent image is formed by forming an image on the photosensitive drum 21 by scanning the optical system. At the same time, copy paper is designated from among the selected cassettes, guided just before the registration roller 17, and copied at a timing that matches the leading edge of the image visualized by the designated developer with the leading edge of the copy paper. Paper is sent out.

Thus, the copy paper that has been transferred by the copy charger 41 is fixed by the fixing device 31 and then sent to the duplex unit 45, but in the case of multiple copy mode, there is no need to turn the paper surface upside down. Therefore, the copy paper guided to the duplex unit 45 by the second conveyance unit 33B is transferred to the switching device 4.
8, the paper is discharged to the intermediate tray 49 in the same position, and
This completes the first copy.

Therefore, the first original set on the document table 8 is temporarily ejected to the document tray 2 via the paper bus path 60, and a new document for second copying is taken out from the RDFI and set on the document table 8. be done.

After the setting, the copy paper that has been copied for the first time is guided from the intermediate tray 49 to just before the registration roller 17 by the third conveyance unit 33G, and is copied in exactly the same manner as the first time. Then, the sheet is discharged via the flapper 44 to the tray 46 of the sorter by the sheet discharge roller 47, and the multiple copying is completed. On the other hand, the second original is discharged from the original table 8 to the original tray 2 via the paper bus path 6D.

Next, regarding the page speed copy mode, for example, the original size is A3, the magnification is 1:1, and the copy paper is selected by automatic cassette selection, and in this case, the copy paper of size A4, which is 172 of size A3, is selected. We will discuss the case where copying is performed first in black and then in red.

First, after the original is set in the RDFI, a key is input to perform quick copying on the operation unit 4, and the number of copies and the developer are input using the keys. In addition to the simple specification mode, there is also a mode that allows you to automatically specify the first color and next color during quick shooting. Therefore, in the following, the first color is black and the next color is black. A case will be described in which the color of is copied in red.

When the start key is input, the original is guided onto the original platen 8, and the optical system scans the original, while the cassette automatically retrieves the copy paper from the cassette that stores A4 size copy paper. It is guided to just in front of the registration rollers 17. Here, the image tip detection sensor 15 on the optical system reading side
detects the detection unit 16 of the moving optical system 11, the registration roller 17 is driven after a predetermined time Tl, and after the black toner is transferred and fixed onto the copy paper at an appropriate timing, it is discharged onto the tray 46. However, at the same time, the next copy sheet (A4 size) is guided immediately in front of the registration roller 17 in the same manner.

On the other hand, the optical system is controlled to automatically return to the reference position after the first exposure scanning is completed, so the moving optical system 1 will return from this reference position for the next copying.
1 starts scanning. In this way, after the detection unit 16 of the optical system 11 is detected by the image detection sensor 15, the time T2 (preset) required for erasing the initial latent image and the potential of the unnecessary area corresponding to the width of A4 size The latent image after the lamp 36 is turned on and the above erasing is performed is retained.

This electrostatic latent image is then visualized with a red developer,
Transfer and fixation is performed by the same process as described above, and the image is discharged onto the tray 46, completing a series of continuous shooting.

As mentioned above, the operation section 4 allows double-sided copying, etc. to be performed by combining multiple developing units, combinations of double-sided copying and quick copy mode, and even multiple copying and quick copy mode, although the explanation is omitted. The configuration is such that the combinations and the like can be freely specified by operating keys or the like on the operation section 4. Furthermore, this recording apparatus has a function of varying the process speed, that is, the rotational speed of the photosensitive drum 21, and its configuration is shown in FIG. Here, the main motor 32 is a DC motor, and in this example, the speed of the DC motor 32 is controlled by a phase locked loop (PLL) 6G. That is, the PLL 80 receives a reference signal from the oscillator 61 and feeds back a speed signal from the encoder 62 connected to the motor 32, so that the PLL 60 synchronizes the reference signal with the fed-back speed signal. The system generates an output signal from the oscillator 61, amplifies it with an amplifier 63, and drives and controls the motor 32 via a driver 64. When the motor speed needs to be changed, the input signal A is used to change the output frequency of the oscillator 61. and B. Note that the human power signals ^ and B are connected to a speed command circuit (not shown).

The rotational speed of the photosensitive drum 21 can be changed by the control device when the light input to the photosensitive drum 21 is insufficient, and the rotational speed can be changed automatically depending on the mode, for example, the process speed. can be made slower.

Note that this device is capable of erasing any part of the latent image on the photosensitive drum 21, and for this purpose, the eraser lamp 36 is arranged with a large number of light emitting elements divided into fine parts. Partial erasure is performed by controlling the light emitting units. Therefore, by having such a partial latent image erasing function, it is possible to perform multi-color image synthesis by combining the above-mentioned multiple copying and developing devices for a plurality of colors.

FIG. 3 shows an example of the configuration of a control circuit for carrying out automatic color multiple copying according to the present invention. Here, 100 is a central processing unit CPU for controlling the entire copying machine, and CPIJloo receives input data such as data related to multiple copying or data related to a specific area to be erased by key input from the operation unit 4 mentioned above. 101 is done manually. In particular, since the present invention aims to prevent copy paper from wrapping around the fixing device, the input data 101 includes data related to a procedure for preventing such wrapping.

Thus, a control signal is output from εPt1lOO to the sequence control circuit 102 so that sequence control corresponding to the above data is performed, and a control signal is outputted to the eraser lamp control circuit 103 so that the erase range is controlled. , a corresponding erase signal is supplied from the control circuit 103 to the eraser lamp 36.

Next, an example of multiple copying using the recording apparatus of the present invention will be described with reference to FIGS. 4A to 4D.

Here, FIG. 4A shows an example of such a manuscript, and is an example of a case where a multiple copy image A such as that shown in FIG. 4D is obtained by a combination of two colors, for example, is obtained from the central image ^ using such a manuscript. .

That is, in the recording apparatus of the present invention, it is possible to erase any specific area as described above. Therefore, in the first copying operation, for example, as shown in FIG. 4B, the outer area C-t of the copy paper 20 is specified as the specific area to be erased, and the inner area C-2 of the image is -1 part is copied using black toner.

In this way, during the first image formation, the eraser lamp 36 is controlled by the eraser lamp control device 103 so that the outer area C-1 is erased. The latent image existing on the area is erased, and toner will not adhere to this area during development. On the other hand, the fuser 31 is coated with silicone oil or the like to prevent wrapping and jamming, and silicone oil tends to adsorb toner, but as described above, the wrapping of copy paper is most likely to occur. Since toner does not adhere to the image tip 2OA, which tends to be easily drawn, it is possible to suppress the occurrence of jams due to adsorption.

Then, in the second image formation, area C-2 is erased and part A-2 of the image in area C-1 is copied with red toner, thereby creating multiple images as shown in FIG. 4D. Copy image A-3 is obtained, but as described above, the first
By ensuring that the leading edge of the image is included in the erased area other than the specific area when copying a specific area for the second time, it is possible to greatly suppress the tendency of the leading edge of the image to be attracted to the fixing device and cause jamming. It is possible.

5A to 5D further show examples of different forms of multiple copying. Here, when trying to obtain a copy as shown in FIG. 5D from a copy original as shown in FIG. 5A, If image B is black and image A is red, first copy image B by erasing area C-1 of the first half of the image and specifying area C-2 of the latter half as a specific area. Then, by specifying area C-1 as a specific area during the second copying, toner is prevented from adhering to the image edge 20A of the copy paper 20, and jams caused by wrapping around the fuser are prevented. The occurrence can be suppressed.

As described above, according to the present invention, it is possible to prevent the fuser from wrapping in the color multiplex mode, etc., and the procedure for preventing the wrapping will be explained with reference to FIG.

First, in step S1, it is determined whether the automatic color multiplexing mode is set, and if the color multiplexing mode is set, the process proceeds to step S2, and the first image specific area including the image tip is erased during the first copying. In step S3, the sequence control mode is set so as to obtain an image of the specific area of the second image that does not include the image edge, and then in step S4, the data is input in the first image during the second copying. Set the sequence control mode to obtain an image of a specific area. Further, the present invention can be applied not only to multiple copying but also to double-sided copying.

〔Effect of the invention〕

As described above, according to the present invention, an image including the leading edge of the copy paper is formed during the first copying by a copying apparatus capable of erasing any image area and performing multiple or double-sided copying. By erasing a specific area and copying an image in a specific area that does not include the image edge, toner is not attached to the image edge of the copy paper and the toner is absorbed. It is possible to suppress the occurrence of wrapping jams in the fixing device, which tend to occur easily.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a copying machine according to the present invention, FIG. 2 is a configuration diagram showing an example of a speed control device for the photosensitive drum, and FIG. 3 is a diagram related to automatic color multiple copying of the copying machine. The configuration diagram of the control circuit, FIG. 4A to FIG.
FIGS. 5A to 5D are explanatory diagrams showing an example of an image specific area on the copy paper at the time of second copying and an example of the image on the copy paper obtained as a result of multiple copying, as further examples,
FIG. 6 is an explanatory diagram showing a copy original, a first image forming specific area, a second image forming specific area, and an image obtained as a result of multiple copying, and FIG. It is a flowchart which shows a control setting procedure. l...RDF. 2...Original tray, 3...Original, 4...Operation unit, 5.37...Developer, 6A to 6C...RDF bus, 6D...Paper bus, 8...Original stand, 10-13.25...mirror, 11...optical system, 15...document image edge detection sensor, 16...detection section, 17...registration roller, 18.19.38... - Cassette, 20... Copy paper, 20A... Image tip, 21... Photosensitive drum, 22... Document detection lens, 23... Detection element, 24... Projection lens, 30... - Power supply, 31... Fixing device, 32... Main motor, 33A to 33D... Transport unit, 34... Pre-exposure lamp, 35... Arcuate charger, 36... Eraser lamp, 40 .50...Paper feed roller, 41...Transfer charger, 42...Separation charger, 43...Cleaning device, 44...Flapper, 45...Double-sided unit, 48...Switching 49... Intermediate tray, 60... Phase locked loop, 61... Oscillator, 62... Encoder, 63... Amplifier, 64... Driver, 100... C20, 101...・Manpower data, 102... Sequence control circuit, 103... Eraser lamp control circuit, C-1, C-2
...Specific area, A, B, A-1, A-2, A-3... Image. Figure 2 Figure 3 Figure 4B Figure 4

Claims (1)

[Scope of Claims] A copying apparatus capable of specifying a specific area of a document and making multiple or double-sided copies of the specific area and outside of the specific area at corresponding positions on a copying material using specified colors, respectively. , means for erasing the image in the specific area or outside the specific area, and means for transferring the image in the specific area or outside the specific area onto a copying material, during the first copying of multiple or double-sided copying. before transferring, the erasing means erases the image in the specific area or the area outside the specific area, whichever includes the leading edge of the copying material;
A copying apparatus characterized in that an image of the other area is transferred.