JPS62208064A - Transfer paper resist control method for copying machine - Google Patents

Abstract

PURPOSE:To adjust a binding margin accurately and securely by comparing a timer value with the timer value in the last copying operation when the timer value is varied after the start of copying operation, and restarting transfer paper when the quantity of variations is less than a certain value and adding or subtracting a prescribed value and fixing the quantity of variations to the final value in plural stages when not. CONSTITUTION:When the front end blank or binding margin of the transfer paper is adjusted, a switch 28 is turned on after the start of the copying operation, and the value of the variable resistance 38 of an adjusting dial 29 is varied to vary the timer output time width of the timer IC 33 of an external timer device 32. A resist clutch is turned on a timer time later. In this case, a CPU 30 compares the timer value with the timer value in the last copying operation and restarts the transfer paper which stops temporarily at the resist rollers when the quantity of variations is less than the certain value. When the quantity of variation exceeds the prescribed value, the constant value is added or subtracted and the resist rollers is started. When the dial 29 is varied abruptly, the value is set to the designated value after copying operation is performed plural times.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a transfer paper registration control method for a copying machine, and more particularly to a transfer paper registration control method for a copying machine that can be applied to a document moving type copying machine.

(Prior art) In a conventional copying machine with a moving optical system, the scanner needs return time, so the conveyance interval of the transfer paper is 15 to 200 degrees.
millimeters, and there was no problem even if the amount of binding was suddenly changed by about 40 to 50 millimeters.

Further, in a general document moving type copying machine, since the return time of the scanner is unnecessary, it is shorter than the above-mentioned optical system moving type copying machine, but it is about 100 to 200 mm. In this document moving type copying machine, in order to create a loop path for each document size and improve the copy making capacity per unit time, the transfer paper interval is shortened to 70 to 80 mm. For example, from -30 mm (when the transfer paper is 30 mm behind the developed image, it is called -30 mm, and the timing of the start of rotation of the registration roller can be delayed by a time equivalent to 30 mm) to +30 mm ( When the transfer paper is 30mm ahead of the imager, it is called +30mm, and if the timing at which the rotation of the registration rollers starts to be advanced by a period equivalent to 30mm is suddenly changed, the transfer paper interval will be clogged by 60mm, and the registration rollers will move further. On the downstream side, the gap between the leading transfer paper and the following transfer paper may be close to zero, or due to variations, some may overlap, resulting in poor timing, resulting in incorrect copies being made or being judged as continuous paper. It became my jam.

Furthermore, there are some copying machines that allow binding margin adjustment to be easily performed externally, but these machines have an external volume and adjust by changing the value of an internal timer in the central processing unit (CPU). Therefore, if a problem such as volume failure or UrR occurs, the timer will not start or end its operation, so the sequence triggered by the end of the timer will not work, and the transfer paper will not be ejected no matter how long the operator waits. Further, if the original is repeatedly circulated, the original will not be ejected because it will not be copied.

(Objective) The present invention solves the problems of the prior art as described above, and provides a transfer paper registration control method for a copying machine that allows binding margin adjustment to be performed accurately and reliably even during copying operation. purpose.

(Configuration) In order to achieve the above object, the present invention includes a document conveyance path formed by a serial loop path, a document sensor provided in front of the exposure slit in the conveyance path, and a document sensor that is activated by a signal from the document sensor. In a copying machine that has a timer device whose timer value can be externally controlled, and which adjusts the timing of copying onto transfer paper based on the operation end signal of this timer device, the timer value is set after the copying process is started by inserting a document. When the timer value is changed, it is compared with the timer value for the previous copy, and if the amount of change is less than a certain value, the transfer paper is sent out according to the output value of the timer device, and is temporarily stopped by the registration roller installed on the downstream side. If the amount of change exceeds a certain value, control is performed using a value obtained by adding or subtracting a certain value from the output value of the timer device to keep the amount of change for each transfer sheet constant. The value is set to the final value after a plurality of transfer paper feeding processes, and when the output value of the timer device is less than or equal to the minimum value or greater than the maximum value that can be taken above the set value, the sequence is set regardless of this output value. This apparatus is characterized in that the copying timing of the transfer paper is controlled by an internal timer within the control section.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 shows an outline of a copying mechanism to which the present invention is applied.

In the figure, the original 1 is placed on the original placing table ii! placed,
The document is sent out to a document repeat section 5 which is composed of a plurality of rollers 3 and a conveyor belt 4. The document repeat section 5 is provided with a document sensor 6 as shown in FIG.
A known optical system 11 including lenses 10 and the like is installed. The light beam 12 of this optical system 11 is
3^, be guided. As is well known, an AC separating section 14, a transfer charger part 15, a document section 1G, an eraser 17, etc. are arranged around the photosensitive drum 13.

On the other hand, the paper feeding section is configured to transport the transfer paper 19 loaded onto the tray 18 from a pickup roller 20 to the photosensitive drum 13 via a pair of transport rollers 21 and a pair of registration rollers 22. . A registration sensor 23 is provided in front of the pair of registration rollers 22, and a drive clutch 25 that activates and stops the paper feed unit clutch 24 and the pair of transport rollers 21, and activates and stops the pair of registration rollers 22.
A resist clutch 26 for stopping is installed.

FIG. 3 also shows a binding margin adjustment unit 27 provided at an appropriate position on the operation unit (not shown), which can be rotated with an external registration changeover switch 28 to adjust the binding margin from -30 mm to +30 mm. An external registration adjustment dial 29 is provided for adjustment.

FIG. 4 shows a control system of the twist margin adjusting section 27.

That is, a central processing unit (CPU) 30 is provided with an internal counter 31, and a timer IC 33, which is a timer device 32, is equipped with a diode D1, a resistor R1, and a capacitor C.
1 and an inverter 35. A capacitor 36, a resistor 37, and a variable resistor 38 are connected to the timer IC 33, and the value of the variable resistor 38 is set by the external resist adjustment dial 2.
The decision will be made at 9.

Further, the external registration changeover switch 28 is connected to the timer device 32, which is the external timer described above, and the CPU 30.
This functions to switch the internal counter 31.

Next, the operation of the above-described embodiment will be explained.

As shown in FIG. 1, the original wS1 is sent to the document repeat unit 5 formed by a serial loop path, and after circulating for a preset number of repeats in the loop path determined by the document length,
The document is removed from the loop path and discharged to a document stacker (not shown). The original FI 51 being repeated is projected onto the photosensitive drum 13 by the optical system 11 at the slit portion 7 to form a latent image. This latent image is developed in a developing section 16, transferred to a transfer paper 19 fed at a predetermined timing by the action of a transfer charger part 150, separated by an AC separation section 14, and sent to a fixing section (not shown).

On the other hand, the transfer paper 19 is transferred from the tray 18 to the pickup roller 2.
0 and is separated and fed to a pair of registration rollers 22. The second and subsequent transfer sheets 19 are fed at intervals 10 to 20 mm shorter depending on the repeat interval. That is, as shown in FIG. 5, which explains the relationship between the original and transfer paper (A4 size is shown as an example), the above-mentioned feeding interval is the repeat interval (the time required for the original to go around the loop path). The reason why the transfer paper is fed at an interval of 10 to 20 mm shorter than the minimum loop length of the embodiment (290 mm) is to provide a timing margin necessary for the registration roller pair 22 to once include the image and timing on the transfer paper 19, and a timing margin required for paper feeding. This is to cover delays caused by slipping of the transfer paper. In this original circulation method, the image forming interval can be shortened and the amount of copies made per unit time can be increased compared to the optical system moving method, but it is necessary to shorten the paper feeding interval accordingly. However, the transfer paper slips during paper feeding, and the value also varies depending on the paper condition, so if the paper is fed at too short an interval, depending on the variation, m1Ili! Since this will lead to continuous feeding and be judged as a jam, the repeat interval is set to lθ~20 mm shorter than the repeat interval.

Also, the leading edge of the n-th transfer paper 19 is connected to the registration roller pair 2.
When detected by the registration sensor 23 in front of the registration roller pair 22, the rotation of the registration roller pair 22 is stopped. However, transfer paper 19
Even when the tip of t hits the pair of registration rollers 22 , it continues to be fed by the pair of transport rollers 21 , so a slack portion A is formed before the pair of registration rollers 22 . This amount of slack can be tolerated up to 30 mm, but if it exceeds this, the slack portion A will break, be eaten by the pair of registration rollers 22, or be folded into a Z shape, so the stop time of the pair of registration rollers 22 is counted. When the slack reaches a value equivalent to 30 mm, the drive clutches 25 for the entire sheet feeding group are turned off. In this state, the n+1th sheet of transfer paper 19 is stopped 50 to 60 mm behind the nth sheet of transfer paper 19, but since there is a slack portion A, the actual distance is 20 to 30 mm. It has become.

As shown in the timing chart shown in FIG. 6, the n-th sheet of transfer paper that is stopped is moved at a timing when the images of the conveyed original are aligned due to the end of the registration timer signal activated by the output signal of the original sensor 6. resist clutch 2
6 and the paper feed unit clutch 24 are off, they are also turned on at the same time and conveyance of the transfer paper begins. The leading edge of the (n+1)th sheet of transfer paper 19 is detected by the registration sensor 23 at the same time as the nth sheet, and is controlled in the same manner as the nth sheet.

There are two types of timers for registration alignment between the original 1 and the transfer paper 19: an internal counter 31 of the CPU 30 and an external timer device 32, and an external registration changeover switch 2.
Switched by 8.

As described above, the timer device 32 is connected to the inverter 3.
5, and the falling part of the output signal of the inverter 35 is differentiated and the timer IC 33 (μA manufactured by Fairchild Co., Ltd.
The differential circuit 34 includes a resistor RI, a capacitor CI, a diode D, and a diode D for triggering the circuit (using 355). For this timer one hour T, the value of the variable resistor 38 is VR, the capacitor 36 is 02, and the resistor 37 is
If R2 is T-(VR+ +Rt) ・Cz
Xo, represented by 7, the minimum value Ts! , -0,7Rt
'Cz, maximum value T,, -0,7 (VR+ □w
+Rt)'Ct, and by selecting the values of Rz, Cz, and VR, the variable range of the one hour timer can be determined.

When adjusting the leading edge margin or binding margin on the transfer paper, that is, if you want to change the registration, turn on the external registration changeover switch 28 and change the value of the variable resistance 3 of the external registration adjustment dial 29. This can be done by changing the timer output time width of the timer IC 33 and controlling the resist clutch 26 to be turned on after one hour has elapsed.

The value of the timer device 32 is set to be the same as the value determined by the internal counter 31 of the CPU 30 at the median value of the variable resistor 38, and the timer device 32 is set to the same value as the value determined by the internal counter 31 of the CPU 30, and the timer device 32 is set so that the time is shortened when turned clockwise and the time is lengthened when turned counterclockwise. So, to give an example, the median value is 1
Set to 10 ms, minimum 10 ms, maximum 2
It is about 10 milliseconds. This external timer device 32
When the transfer paper reaches the registration sensor 23, the CPU
30 outputs a trigger output, and its value is counted by a 1 millisecond interrupt signal connected to the interrupt input of the CPU 30, as shown in the flowchart of FIG. After the count is completed, the value is placed in the register-on-data buffer. When controlling with the internal counter 31, 110 milliseconds of data is directly put into the register on data buffer.

In addition, in a typical copying machine, once copying starts, key operations on the operation panel are disabled, and settings or modes cannot be changed until after copying is complete, but in this example, the transfer paper Because of the long transport distance, it may take nearly 10 seconds for the transfer paper to be ejected, so if you disable the operation until copying is complete or the last paper is ejected (when copying is interrupted), you may make a wrong selection or If you forget or make a mistake, it may take some time to reset the settings and complete the copy.
Since some copies may be erroneously copied, some functions such as copy density adjustment and binding margin adjustment can be freely selected or set even during copying operation.

For example, as shown in the flowcharts in Figures 7 and 8, if you forget to adjust the binding margin and insert a manuscript,
After insertion, the external registration switching switch 28 is turned on so that the external registration adjustment dial 29 can be adjusted to the desired amount. In this case, even if you insert the original before turning on the registration switch 28, if you turn on the registration switch 2 within a few seconds after inserting the original, the mistake will not be made and the registration will be shifted from the first copy. You can get a copy.

On the other hand, even if the previous operator forgets to turn off the registration switch 28 after copying and starts copying before the next operator checks it, all he has to do is turn off the registration switch 28 within a few seconds, so there is no chance of making a mistake in copying. The probability of occurrence can be lowered.

However, on the other hand, since the registration amount can be varied even during copying, if the external registration adjustment dial 29 is turned from maximum to minimum in a short period of time and the copying follows suit, the transfer on the downstream side of the registration roller pair 22 The conveyance interval of the paper 19 becomes shorter, causing problems in controlling the conveyance of the transfer paper 19.

For example, if you suddenly change the value from -30 mm to ±30 mm during copying, the n value will shift by -30 mm.
After the first sheet of transfer paper is sent out from the registration roller pair 22, the transfer paper is sent out +30 mm earlier than the original (the transfer paper before the registration roller pair 22 is sent out about 30 mm earlier than the original). (Since the (n+1)th sheet of transfer paper is fed out by the registration roller pair 22 almost without stopping), the interval between the transfer sheets on the downstream side of the registration roller pair 22 is normally about 20 to 30 mm. Become.

Also, depending on the surface condition of the transfer paper at the paper feeding section, the feeding interval may vary by 30 minutes.
~40mm sometimes, spacing 0-1
It may even be 0 mm.

In this case, the responsiveness of the transfer paper detection sensor (not shown) after registration roller pair 22 is made poor to avoid false detection due to noise voltage, so the gap in the transfer paper cannot be detected and it is determined that the jam is a stuck jam. This may cause the device to stop working.

In order to eliminate the above-mentioned problems, even if the external registration adjustment dial 29 is suddenly changed during copying, the transfer paper does not follow it in one go, and the amount of change per copying is limited to a maximum of 1.
5 millimeters, and it catches up to the specified setting value after several copy operations. In other words, even if you suddenly change the resist amount from 30 mm to +30 mm, the timing of the transfer paper will be -30, -15, 0, +15.
This is so that the image shifted by +30 mm can only be obtained after copying the fifth copy.

Also, when the registration changeover switch 28 is turned on during copying, the amount of change is controlled in the same way, but usually the shift is 5 to 10 mm.
It's not really a problem.

Since the program processing within the CPU 30 involves putting the external register timer value into the RAM,
As shown in the flowchart in Figure 1, the next counted timer value is compared with this, and the difference is a value equivalent to 15 mm, here a value equivalent to 15 mm, here 15 mm + 0.3 mm. (32H in hexadecimal), the pair of registration rollers 22 is activated when the value is added or subtracted by 50.

Also, when the timer in the external timer device 32 is inactive (
When the timer does not turn on or continues to turn on), the timing for ejecting the transfer paper cannot be determined, so when the timer value is less than 10 milliseconds, the CPU 30 110, same as internal timer value
Starts registration roller pair 22 in milliseconds, and starts registration roller pair 2 in 215 milliseconds when the time is 210 milliseconds or more.
I am trying to start 2.

By doing the above, even if you forget to connect the timer device 32, the variable resistor 38 is damaged, or the timer IC 33 is damaged, the sequence control will operate normally and the transfer paper can be ejected without jamming, so there will be no timer failure. It is possible to eliminate the downtime of the equipment itself.

Furthermore, in the event of an abnormality, an error code is displayed on the display section (not shown), so the operator can turn off the registration changeover switch 28 and perform the copying operation.

If the leading edge registration is shifted, the entire document image is not transferred onto the transfer paper, so that an untransferred area remains on the photosensitive drum 13. This untransferred image causes unnecessary consumption of toner and burdens on the cleaning action, so it is preferable to eliminate it. Therefore, as shown in the flowcharts shown in FIGS. 13 to 16, an eraser is 17, the latent image is erased at the leading edge of the transfer paper.The eraser 17 is turned off when the internal counter 31 or timer device 32 of the CPU 30 activated by the document sensor 6 starts, and the rear end of the transfer paper is erased from the resist. It is turned on when the sensor 23 falls or the trailing edge of the transfer paper is detected.Therefore, even if the positional relationship between the original image and the transfer paper is arbitrarily shifted by shifting the leading edge registration, the latent image outside the transfer area will not be traced. This prevents untransferred areas from occurring, which burdens the cleaning action and from consuming unnecessary toner.

The timing for erasing the tip is such that the tip is erased by about 2 to 3 millimeters, and this is done to prevent a solid black portion from being easily wrapped around the fixing roller if there is a solid black portion at the tip.

(Effects) As explained above, the present invention enables accurate and reliable binding 1i! even during copying operation. It is possible to provide a transfer paper registration control method for a copying machine that can perform alignment.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing an overview of a copying system 411, FIG. 2 is a partially enlarged explanatory diagram of a document repeat section, and FIG. 3 is a front view of a binding margin adjustment section. Figure 4 is a schematic diagram of the control system, Figure 5 is a diagram showing the relationship between the original and transfer paper when the registration is shifted, Figure 6 is a timing chart, and Figure 7 is a diagram showing the relationship between the original and transfer paper when the registration is shifted.
17 are flowcharts of each part, and FIG. 7 is a flowchart related to key operations in external registration switching, and FIGS. 8, 9, 10, 11, and 1
Figure 2 is a flowchart related to external resist adjustment control;
FIGS. 13, 14, and 15 are flowcharts related to control of the registration clutch and paper feed unit clutch, FIG. 16 is a flowchart related to erase control, and FIG. 17 is a flowchart related to timer count. DESCRIPTION OF SYMBOLS 1... Original document, 5... Original conveyance path, 6... Original sensor, 19... Transfer paper, 22... Registration roller,
25... Drive clutch, 26... Registration clutch, 30... Central processing unit (CPU), 31... Internal timer, 32... Timer device. Agent Patent Attorney 2 Sequential Division 1st! 1 Figure 4 One Figure 5 Figure 6 Figure 7 Figure 16

Claims (2)

[Claims] (1) A document conveyance path formed by a series loop path, a document sensor provided in front of the exposure slit on the conveyance path, and a timer device whose timer value can be externally controlled by a signal from this document sensor. In a copying machine which has a timer device and adjusts the timing of copying onto transfer paper according to an operation end signal of the timer device, when the timer value is changed after the copying process is started by inserting the original,
Compare it with the timer value for the previous copy, and if the amount of change is less than a certain value, the output value of the timer device will feed the transfer paper, and the registration roller installed on the downstream side will feed the transfer paper, which is temporarily stopped. The restart is controlled, and if the amount of change is above a certain value, the output value of the timer device is controlled by adding or subtracting a certain value, and the amount of change for each transfer sheet is set to a constant value and multiple transfers are performed. A transfer paper registration control method for a copying machine, characterized in that a final value is set after a paper feeding process. (2) A document conveyance path formed by a serial loop path, a document sensor provided in front of the exposure slit in the conveyance path, and a timer device whose timer value can be externally controlled by a signal from the document sensor. In a copying machine that adjusts the timing of copying onto transfer paper based on the operation end signal of this timer device, when the output value of the timer device is below the minimum value or above the maximum value that can be taken above the set value, this output value is set. 1. A transfer paper registration control method for a copying machine, characterized in that copying timing of a transfer paper is controlled by an internal timer in a sequence control section.