JPS63212676A - Copying controller - Google Patents

Abstract

PURPOSE:To facilitate the confirmation of a spot where a paper jam is easy to occur as well as to aim at the shortening of maintenance time, by measuring the timing that copying paper passes through the detecting sensor installed in a conveyor passage, and displaying the timing data according to necessity. CONSTITUTION:Like sequence control for latent image formation, the sequence control in a conveyor system also takes a timing pulse from an encoder 16 of a sensitizer drive motor 15, the pulse is divided by a divider 12 and inputted into a central processing unit 10, interrupting it with the signal, and each signal out of respective copying paper detecting sensors 19-28, then the on or off encoder pulse count value is entered in each data area of a random access memory. And, these data are displayed at need, and if the value is out of the preset range, it is set down to conveying abnormality. Thus, the shortening of maintenance time and improvement in reliability are well promotable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a copy control device, and particularly to a transfer paper conveyance control device.

(Prior art) In general copying machines, a detection sensor installed in the conveyance path checks for abnormalities in the conveyance of the transfer paper, and when an abnormality is detected, the conveyance motor is stopped and a message indicating that an abnormality has occurred is displayed. It has become.

By the way, in high-speed copying machines, the distance between the transfer sheets is short and precision is required, and even the slightest delay cannot be tolerated, so the accuracy of jam detection is also strict.

Therefore, slight delays due to roller wear or slipping, or delays due to roller scratches, etc.
Even though a jam occurs, it cannot be visually recognized, and the cause of the jam cannot be determined, resulting in a time-consuming maintenance process.

(Purpose) The present invention was made based on this background,
The purpose is to easily identify the cause of jams, shorten maintenance time, and improve reliability.

(Structure) For this purpose, the present invention measures the conveyance timing of the transfer paper and displays the data, so that it is possible to easily know which detection sensor caused the delay.

An embodiment of the present invention will be described below.

FIG. 1 is a configuration diagram of a copying machine according to the present invention.
and an automatic document feeder (hereinafter referred to as DF) B. The copying operation when using these will be explained.

The copying operation is started by setting the necessary copying style on the operation section provided on the copying machine main body A and pressing the print button. The copying operation when using DF will be explained below.

The DF has a document tray 201, and 11 documents placed there are fed by a document feed belt 202, passed through a document conveyance path 203, and conveyed onto the contact glass 101. Then, the original is read by flash lamp 102.
The entire surface is irradiated with light. The power source 103 of the flash lamp is charged in advance by a control device, which will be described later, and emits light at a predetermined timing.

The reflected light from the original is transmitted to the belt photoreceptor 107 by the first mirror 104, the through lens 105, and the second mirror 106.
to expose. The photoreceptor 107 is uniformly charged with a charge by a charger 108, and forms an electrostatic latent image by exposure. The electrostatic il image on the photoreceptor 107 has unnecessary charges removed by an eraser 109, is developed by a developer 110, and is sent to a transfer section. At the transfer section, the developed original image is transferred onto transfer paper by a transfer charger 111. This transfer paper is placed in the paper feed tray 112°113.11
4, passes through a conveyance path 115, and is sent to a transfer section by registration rollers 116 in synchronization with the original image. The image-formed transfer paper is transported by a conveyor bell)
117, is fixed by a fixing device 118, and is conveyed to an output tray 119. The original on the contact glass 101 is sent out by the original transport belt 204 after the light irradiation is completed, and is transferred to the original tray 201 by the original ejection roller 206.
will be returned to. The document ejection roller 206 can rotate forward and backward, and when the front and back sides of the document are to be the same as the original state, the document ejection roller 206 is rotated after the trailing edge of the document passes the document switching claw 205.
06 is reversed and ejected through the normal rotation conveyance path 207. If the document is desired to be reversed, the document ejection roller 206 is driven as it is, and the document is ejected from the reverse conveyance path 208.

Since this belt photoreceptor 107 has a seam, the image forming area on the belt should avoid the seam of the belt photoreceptor 107.
Equal intervals are determined for each size.

FIG. 2 is a diagram showing an example of the arrangement of image forming areas (segments) of the belt photoreceptor 107 cut at the seam and developed. In the example of FIG. There are 4 segments, indicated by the two-dot chain line A
The three segments are determined to be equally spaced.

FIG. 3 is a control block diagram for forming an image on the belt photoreceptor 107, and is shown together with the belt photoreceptor 107.

This operation will be explained below.

As described above, in order to avoid seams during image formation, it is necessary to determine the image formation wt area on the photoreceptor 107 prior to image formation. For this purpose, a synchronization mark 2 (Fig. 2) is provided on the edge of the belt photoreceptor 107 at a certain distance from the seam 1 (Fig. 2), and the 0 image is detected by the mark sensor 17. In order to determine the formation area, it is necessary to drive the photoreceptor 107 and detect this mark. For this purpose, a drive signal from the output port 13 is input to the motor control circuit 14, and the motor control circuit 14 drives the photoreceptor drive motor 15. An encoder 16 is integrally attached to the photoreceptor drive motor 15 and outputs a number of pulses proportional to the moving distance of the belt photoreceptor 107. The pulse signal is input to the motor control circuit 14 and used to rotate the photoreceptor drive motor 15 at a constant speed. Further, the pulses are inputted to the frequency dividing circuit 12, frequency-divided by a predetermined frequency division ratio, and then inputted to the CPU10 and counted. Since this signal is proportional to the amount of movement of the photoreceptor 107, the image forming area is determined by this count value.

As an example, determination of an A4 segment will be specifically explained.

The number of pulses per revolution of the photoreceptor 107 is set to no.

This means that the synchronization mark 2 on the photoreceptor 107 is the mark sensor 1.
7 and input as a mark signal to the input port 11 until the next mark signal is detected. The value obtained by dividing this pulse number no by 5, which is the number of A4 segments, becomes the width of the image area of the A4 segment.

Therefore, the pulse value at the beginning of the A4 segment is given by the following equation.

Pulse value at the beginning of the A4 segment wa0+nx (n615) n=”o, 1.2.3.4 Here, aa is the pulse value from the joint of the photoreceptor 107 to the beginning of the segment.

Next, the latent image forming operation in the copying operation will be explained.

When the leading value of the segment reaches a predetermined value, a sequence operation starts, and a sequence control counter starts operating. This counter performs a count-up operation in response to a pulse signal from the frequency dividing circuit 12, but is not cleared by a mark signal and continues to perform a count-up operation until the sequence is completed. The sequence operation will be explained step by step below.

When the counter starts operating and the count value reaches the value of CNTO, a signal is output from the output port I3 to the power pack 18, and the transfer charger 111 and separation charger 120 start operating.

Further, the photoreceptor 107 rotates, and the count value changes to CNT10.
When the value is reached, the charger 108 operates in the same manner as described above, and uniformly charges the photoreceptor 107. When the count progresses further and the count value reaches CNT2, a charging start signal is input from the output port 13 to the flash [fi 103, and in order to light the flash lamp, charge is stored in the capacitor in the flash power supply 103 and the flash signal is transmitted to the flash power supply. 103 turns on the flash lamp 102, irradiates the original set on the contact glass 101 with light, and exposes the photoreceptor 107. The flash signal at this time is output when the count value is CNT3. When the photoreceptor 107 further rotates and the beginning of the original image reaches the position of the eraser 109 (CNT4),
The eraser 109 disappears, leaving an electrostatic latent image only on the original image. This electrostatic latent image is developed in the developing section 110 and transferred onto the transfer paper conveyed from the paper feed tray.

In order to synchronize with the original image, transfer of the transfer paper starts at different timings depending on which tray is selected. In other words, in the case of the lower tray 112, CNT-LOW"?'
In the case of the middle tray 113, the transfer is started at CNT-MID, and in the case of the upper tray 114, the transfer is started at CNT-HIGH. The transfer paper on which the original image has been transferred is transferred to the conveyor belt) 117
, and is fixed by a fixing device 118 . Double-sided switching claw 1
21 is activated when the value of CNT5 is set, and the transfer paper is switched so that it is conveyed to the duplex tray side in the case of duplex mode, and to the paper discharge side in other cases. The discharge switching claw 122 is
Operated by CNT6, it switches between discharging to the main body tray or discharging to the peripheral device side. The sequence operation ends when the transfer paper is ejected.

Next, we will discuss the measurement of the timing of passage of the transfer paper through the conveyance path.
This will be explained using figures. The flow is shown in FIG.

As mentioned above, the timing pulse for sequence control of latent image formation is generated by the encoder 16 of the photoreceptor drive motor 15.
Although the sequence control of the conveyance system is similar,
The pulse obtained by dividing the encoder pulse by a frequency divider is CP.
It inputs to UI O, interrupts with that signal, takes in the signals of each transfer paper detection sensor 18 to 27 through input boat 11, checks whether each sensor is on or off, and if it is on or off, the fifth Write the counter value in the data area having the arrangement shown in the figure.

For example, in the case of feeding paper from the middle tray 113, the paper feeding operation is started when the sequence counter reaches the value of CNT4, the pulse value is counted up each time an encoder pulse is input to the CPU10, and then the middle tray sensor 19 It is checked whether or not it is on, and if it is on, the count value of the encoder pulse at that time is written in the predetermined area. Similarly, for each sensor, the on value is entered in the following order.

Middle sensor 19 → registration sensor 22 → separation sensor 23
Fixed sensor 24 → double-sided branch sensor 25 → branch sensor 2
6 → Wandering sensor 27 However, in the case of double-sided mode, the conveyance path is the double-sided switching claw 121
Since it is on the double-sided tray 123 side, the branch sensor 26
Also, there is no need to perform detection by the paper discharge sensor 27.

Next, regarding the detection of conveyance abnormality, since the on-off pulse data of the transfer paper is measured at each sensor,
If the value is outside a preset range, it may be determined that the conveyance is abnormal.

Next, FIG. 7 shows the operation and display unit according to the present invention, and the data display will be explained together with the operation mechanism.

Operation keys are 10 keys (1 to 9, 0) 29, program key 30, clear/stop key 31, print key 32
, density adjustment key 33, standard mode setting key 34, paper feed selection key 35, magnification setting key 36, duplex copy key 37
, stack key 38, sort key 39, RDF key 40
, ADF key 41, which are not normally visible on the display section 42, but when turned on, a display as shown in the figure appears. Its functions will be explained below.

RDF and ADF keys 40 and 41 are automatic document feeder gIB
The RDF is used to circulate the original and make a set number of copies, and the ADF is used to stop the original and make a set number of copies.

The stack key 38 and the sort key 39 are well known and need no explanation.The double-sided copy key 37 is used to make a double-sided copy from a single-sided original, to make a double-sided copy from a double-sided original, or to make a single-sided copy from a double-sided original. used for. The paper feed selection key 35 selects the paper feed trays 112 and 11.
3,114, and the display section 42 shows A4 in the first paper feed tray and B4 in the second and third paper trays.
゜A3 is set, and when the first row is selected, the A4 display area is surrounded by a frame. The display to the left is the remaining amount display, which shows the amount of transfer paper remaining in each tray.

To set the magnification, there are an enlargement key and a reduction key (magnification setting key 36), and when these keys are pressed, % is displayed on the display section 42 in 1% increments, for example.

For example, if #71%' is displayed, 'A3→
A4' is also displayed to inform that the magnification is to reduce A3 to A4. The 10 key 29 is used to set the number of sheets or copies, and is displayed in the upper seven segments of the display section 42. The lower 7-segment display is for displaying the number of copies or copies. The program key 30 is used for displaying timing data or inputting data such as registration adjustment and erase adjustment. Display section 4
3 is a dot display, which is used as necessary for guidance display or data display. Clear/stop key 31, density adjustment key 33, and print key 3
2 will be omitted from explanation.

(Effects) The present invention is as described above, and according to the present invention, by displaying the detection data of the sensors provided at each part of the conveyance route, it is possible to easily confirm where jams are likely to occur. This makes maintenance easier.

4. Brief description of aspects FIG. 1 is a diagram showing the configuration of the copying machine according to the present invention, FIG. 2 is a diagram showing the image forming area of the belt photoreceptor, FIG. Fig. 5 is a block diagram of a jam detection control system according to an embodiment of the present invention, Fig. 5 is a diagram showing jam detection data at each sensor position, Fig. 6 is a control flowchart, and Fig. 7 is a plan view of the operation and display section. It is.

c-I-S+I CJ Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A detection sensor is provided on the conveyance path of the transfer paper, the timing at which the transfer paper passes the detection sensor is measured, and if necessary,
A copy control device characterized in that the timing data can be displayed.