JPS5831354A - Processing device for overlap of recording sheet in both face recording device - Google Patents

Abstract

PURPOSE:To prevent the generation of a defective paper where the first face is blank and an image is copied only on the second face, by ejecting a sheet, where no image is recorded on the first face, to the outside of a carrying path if this sheet is detected on a relaying tray when an image is copied to the second face through a relaying carrying path. CONSTITUTION:A transfer paper where the copy for the first face is completed is stored into a relaying tray 9 through a position (a) of a switching guide 8 so that an image is in the upper side, and a switching guide 18 is provided in the upper stream side of a relaying carrying path 11. A density detecting sensor 15 is attached above the tray 9 to detect an untransferred paper. In case of the copy for the second face, it is detected by the sensor 15 that the transfer paper is blank, the position of the guide 18 is switched to a position 18b, and the untransferred paper is ejected to a blank paper tary 19. Thus, the generation of a defective paper where the first face is blank and the image is transferred only on the second face is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the first Wi-th recording process of both recording devices.
The double-fed undelivered paper is detected during the conveyance of the 11th record-line 1, and is discharged to the outside of the conveyance path in the 2nd w-th record-O#l. It is O.

Taking a double-sided copying device as an example, in such a copying device, it is necessary to avoid as much as possible the transportation of rounded or defective transfer paper, which has two transfer surfaces, and in particular, double feeding of transfer paper is one of the major problems.] Various mechanisms are in operation to prevent double feeding.

The present invention focuses on double-fed recording sheets, especially a recorded sheet on which the first side is correctly recorded, and an unrecorded sheet (blank sheet) that is double-fed, and removes it to the recording section on the second side. I was trying to get the correct double-sided recording sheet, and the first meter
In a double-sided recording apparatus, a recorded recording sheet is temporarily stored in a relay tray, and the recording sheet is fed and conveyed from the relay tray via a feed roller and a relay conveyance path. During the conveyance path to the recording unit including the tray, the undistributed sheets detected by the first side undistributed 1/Iy-)0 detection means and the armpit detection stage are transported to the second side before recording.
The present invention provides a multi-fed recording sheet processing apparatus which is not equipped with a means for ejecting the sheets out of the conveyance path. It is as follows.

■ The untransferred paper (hereinafter also referred to as blank paper) generated in the 11th transfer process can be removed from the conveyance path before the 2nd rfJ transfer, so that the 1st W1 is blank paper and only the 2i1 is transferred. This prevents the production of defective copies.

(2) To prevent defective copy sheets from being collated and to prevent the creation of surplus copy sheets when a collating machine (hereinafter referred to as a sorter) is used for II#.

■ Copying time can be shortened because there is no interruption in the copying process due to double feeding processing.

An embodiment in which the present invention is applied to a photo shoot will be described below with reference to FIGS. 1, 2, 3, and 4. Image formation, image formation, transfer, 411 does not explain matters that already use known technology, such as fusing.Currently, when using a uniform copying device,
Perform normal copying at 01, put the transfer paper into the sorter,
Assume that copying is carried out under the conditions that paper is fed from the transfer paper tray, double-sided copying is performed, the number of copies is 20, and B4 white transfer paper is used.

In this case, each of the corresponding operations on the operation section in FIG. When the buttons 201, 202, 203, 204, 205 and number of sheets are pressed, one side is switched to the position a by the input from the button 1205.
Please place the original on the first page” is displayed.

Furthermore, since white transfer paper is used, if a setting other than the 0 display color thread is required when the 'white' button 207 is pressed, press the 0FIP gp button 20B to stop the operation.

1st ff1lriJ [Place draft, copy? When the l button 206 is pressed, copying starts, and the transfer paper (D) is fed out by the draft paper base roller 2 and transferred to the reso star roller 23.
The transfer unit 5 is synchronized with the image on the drum 4.
The image passes through the transport unit 6, the fixing device γ, and the switching field 8, and is stored in the relay tray 9 with the image side facing up. In the relay tray 9, in preparation for feeding the second side of the transfer paper, the width of the transfer paper O is adjusted and the leading edge is aligned.

The specified first side of 920 sheets has been transferred, and the first side of 20 sheets has been transferred.
When the orchid transfer paper is stored in the relay tray 9, the ko-♂- relays the message, and the message "Please send the original for the 1st and 2nd ffi" appears on the 2nd page.
It will be displayed on the WJ display, and when the switching is id 8, I! Move to.

So I put down the 2nd @H manuscript and asked again Puppy? Tan 206
When you press , copying on the second side @01ll starts, and the intermediate tray 90 transfer paper passes through the relay conveyance path 11 and is again synchronized with the cocoon on the drum 4 by the register 3.
12 sides are transferred, transported, fixed in fixing 1)7, passed through switching f-P8, and stored in No./17.

・ When transfer paper is double-fed during 1st flJ (D* copying), most of the paper is transported by the overlapping 11 relay tray 9t, but if the double-fed paper separates during feeding, the transfer paper transport path Senna-1 that detects the presence of transfer paper that has been removed
The jam detection sensor 1s is located at the upper part' of the relay tray 9 and is capable of 11 movements. Furthermore, the reference level range is determined in advance based on the background color of the transfer paper, and the level is switched depending on the color of the transfer paper. Switching is performed using the button 207 of the nine operating sections shown in FIG.

The transfer sheets that have been multi-fed without being separated and stored in the relay tray 9 are subjected to width adjustment and edge alignment at ζζ. That is, the transfer paper stored in the relay tray 9 is separated one by one when it is fed by the paper feed roller IOK for the subject on the second side. It has become.

When the untransferred paper in the transfer of the first side is detected to be blank by the number detection sensor 15, the f ID 1Bm is transferred to the IO replacement p1 blank paper tray 19 in the state 1811I shown by the broken line. be discharged.

If the next first side transfer paper is transferred normally, the f ID will return to the lid at about 18aO for the next paper feed. Therefore, the copying machine will continue copying without stopping. Continuing the discussion, the structure and operation of a part of the p1 occupancy detection sensor will be explained in detail with reference to Fig. 3. A rack 304 is fastened to a sensor base 303 that slides along it. A motor 2105, a tension meter, and a meter 30g are fixed to the side plate, - a gear 30γ on the motor shaft, and a tension meter 30
Gears 30B are fixed to 6, and these gears are
According to the input from the motor 305, the sensor base 303 moves in the direction of the arrow (m).
4 tensiometers/306 points is detected and stopped.

A rotatable shaft 309 is attached to the sensor base 303, and to the shaft 309 are fixed an output shaft of a meter 310 and a potentiometer 311.

Sugerocket,) 310K is engaged, and the other side of the chain 312 is engaged with Sugerocket 313, Sufv
The output shaft of a motor 314 is fixed to the ) 313, and the output shaft of the motor 314 is fixed to the sensor base 303. Chain 312 has llAl1! The detection sensor IS is fixed and moves in the direction of arrow (B) as the motor 3140 rotates, and its position is detected by the I tensiometer 311 and it stops. A swingable arm 315 is attached to the aI degree detection sensor 15, an arm 316 is swingably attached to the arm 315, and the sensor base 3 is attached to the other end of the arm 316.
When the shaft 317 fixed to the shaft 317 is engaged, a moment is applied to the threaded spring 31B attached to the shaft 317 to rotate it in the direction of the arrow (C). The wiring cable 321 of the concentration detection sensor 115 connects to the pulley 319.
．． 320 is held on arms 315, 316, and motors 314. A cable 322 is attached to the side plate together with the cable of the meter 311 and is guided to the nine gooley 323 and then to the control board (not shown).The concentration detection sensor 15 is connected to the sensor Base 30
Since it slides while being guided by the groove 303aK of 3, there is less vibration due to movement.In addition, the concentration detection sensor 15 detects the concentration, and the hollow area is approximately 3-3, so that the light emitting element and the light receiving element are The difference between blank paper and paper with image transfer is determined by the reflection density. Further, in the case of transfer paper with a red-medium-blue background color, the reference level is different from that of transfer paper with a white background color, so that untransferred paper and transferred paper can be easily distinguished.

Next, referring to Fig. 4, the document placement state and the corresponding operation of the density detection sensor 150 will be described.

In Figure 1 of I4, the original is in an electrically conductive state, and the lower right corner is aligned with the reference. Therefore, the positions of the images on the relay tray 9 are aligned so that the upper left is the reference point, as shown in FIG. 4). If transfer paper No. 34 is selected, the density detection sensor 15 moves to the black circle 4010 and stops. In Fig. 4(a), lines and black circles are marked for each size of transfer paper, and the dots are the scanning starting points of the density 4 degree detection sensor 150 corresponding to each paper size.

When the first side transferred O transfer paper is collected in the relay tray 9, if a signal with an image is input to the density detection sensor 15,
The position is maintained, and the presence or absence of an image on the transfer paper to be fed is detected in synchronization with the signal from the paper feed roller 10 (first m1). If there is no image, the paper feed is immediately stopped and the above-mentioned process is performed. Processing blank paper - In the case of a high-speed copying machine, there is a possibility that paper feeding may be delayed, so the density detection sensor 15 is activated by the sensor 13f (Fig. 1) in synchronization with the signal from the previous transfer paper. It's better to let them work.

When positioning the density detection sensor 15, for example, when the transfer paper is B4, the density detection sensor 1s stops at the position of the black circle 401. However, if there is no image at the position of the black circle 401,・)K As shown, move the sensor from the black circle 401 to the circle 402, detect the image, move 9 and stop. 0 If no image is detected, move the sensor from the black circle 401 to the circle 40.2. to circle 402a, further 4
Move to 01m and proceed on the final circle 4041, circle 40
If no image is detected after scanning at 4t, the transfer paper in the relay tray 9 is determined to be normal and sent out.

'If it takes a long time for the sensor 15 to move from the black circle 401 to the circle 4040 position, the start time of the second screen will be delayed, but if you need to speed it up, use a chain that increases the detection area of the sensor 15. In this embodiment, the number of sensors is 1, the sensor scanning speed is 450 w/'m**, and the length of B4 paper is 340-1 in the longitudinal direction and 24 seconds in the short-side direction. Assuming that the sensor is scanned in 8 reciprocations and the detection diameter of the sensor is 20 cm in diameter, the scan will be completed in just over 7 seconds. If you consider the time required to replace the original on the second side, it will take about a few seconds more.
! In most cases, the image is detected during the scanning process, and if the transfer paper is small in size, it will be detected quickly, so the influence will be small.

If the transfer paper double-fed due to paper feeding is slightly shifted before transfer, it can be used as a subject paper in most cases if the shift is only a few ■, but 10■@fO
If misalignment occurs, the image will be greatly chipped and the copy paper will be defective in the 11th and 11th copies. Therefore, in this apparatus, the total length of the transfer paper is determined by the paper detection sensor 13bK. When transfer paper is selected, the length of the paper to be fed will be skewed in advance, so if the paper is deviated due to double feeding, the length of the paper passing through the sensor 13k will be longer, so it will be treated as an abnormality and the paper will be fed twice. A 0 double feed display is performed, but if the paper does not interfere with the paper feed υ, the "jam" message is not displayed and the paper is allowed to pass through the paper 11 and discharged onto the tray 12. Therefore, the switching mode 8 is switched to the state of , and when double feeding is detected by the sensor 13h, it immediately returns to the state of ta. 9 Sensors 20a and 20b are arranged to detect when the transfer paper enters the bin, and switching guides (not shown) for feeding the transfer paper to each pin are arranged at the sensors 20m and 20b.
The transfer paper is switched to the next pin according to the signal when the light is cut off quickly.
Since the @ blank paper has not yet been fed into the sorter, the switching of the V unit will not be performed until the normally transferred paper arrives, and then the normal transfer paper will be correctly fed into each bin. It becomes with you.

For example, when performing double-m* copying using an automatic document feeder, the first side of the first page of the document may be blank, but in this case, the normal copying process If a blank sheet of paper is placed in the relay tray 9 and the second side is copied, the same copy sheet as the original will be obtained.

As is clear from the above theory, in addition to the expected effects described in the present invention, complete functionality as a double-sided recording device can be achieved by adding various mechanisms. .

4. WJfliO easy lI! 111a is a vertical cross-sectional view of an example of a double-sided copying apparatus according to the present invention; FIG.

This is a detailed diagram of part of the swtFiat detection sensor.
Figures Km- and -) are flat diagrams showing the loading state of the originals, and Figures 3) are flat diagrams showing the positional relationship of images on the relay tray.
1I%C) is a flat diagram showing the movement path of the concentration detection sensor.

1-Drawing paper stand 2... Lower paper feeding stand feed>Roller 3-
Regis/m-ra 4-P tsum 5-transfer section 6-conveyance section 7 constant arrival a+8-switching guide 9-relay tray 10-/relay tray feed roller 11-relay conveyance path 1''...XSa~131- Detection sensor 15-11 degree detection sensor 1γ-18・-f ID 19-Blank paper tray 301.302...7 on guide rod 303--One base 304-Tick 3G!5.314-・Motor 306.311 ...l tension, meter 307.308
- One wheel 309.317...Axle 310.313--Sprocket 315.316-Arm 318-Screw spring B19. S20. B25-y Loli 321. $22-・Ketzl

Claims (1)

[Claims] In a double-sided recording apparatus, the 11i recorded recording sheet is temporarily stored in a relay tray, and the recording sheet is fed and conveyed from the relay tray via a feed roller and a relay conveyance path for recording on the second side. In the conveyance path to the recording unit including the middle tray, there is a 111M undistributed sheet) O detection means, and an unrecorded sheet detected by the detection means is transported to the 2nd f.
1. A multi-fed recording sheet processing device comprising: means for taking out # of sheets out of the conveyance path before recording.