KR100189202B1 - Carrier characteristic deterioration compensation method and apparatus for electronic duplicator - Google Patents

Abstract

The present invention relates to a method and a device for correcting a carrier deterioration of an electronic copying machine which automatically corrects a deterioration of a carrier by adjusting a toner replenishment amount when a developer characteristic is deteriorated. In order to detect the life, the number of copies is counted, and the copy number count value is compared with the reference copy number value representing the carrier life to determine whether it is the same. If the number of copies is equal to the number of sheets of reference, the adjustment magnetic core is rotated 90 ° to the right from the current position to increase the toner content. Then, the carrier reference copy number is reset twice, and it is determined whether the copy count value accumulated up to now and the reset carrier reference copy value that have been reset are the same, and the copy count value of the carrier is reset. In this case, the magnetic core is controlled to be rotated 90 ° to the right to increase the toner content ratio, thereby increasing the toner replenishment amount to compensate for the deterioration of carrier characteristics.

Description

Method and device for correcting carrier deterioration in electronic copier

The present invention relates to a method and apparatus for correcting carrier deterioration in an electronic copying machine, and in particular, a method for correcting carrier deterioration by automatically adjusting a toner replenishment amount when the developer characteristic is deteriorated. And to the apparatus.

An electronic copying machine adopting the conventional dry developing method mixes a ratio of a carrier and a toner in order to send the toner to the electrostatic latent image on the drum surface by frictional charging. A mixture of the carrier and the toner in a predetermined ratio is called a binary developer (hereinafter referred to as a developer). The carrier is a medium for adsorbing toner on an electrostatic latent image, and iron ferrite, glass beads and the like are used. If such a carrier is used for a long time, as the carrier ages, characteristics deteriorate and images deteriorate. Depending on the factors such as the ratio of the toner and the carrier or the frictional charge amount, high quality copying is possible. In the conventional method, the factor cannot be adjusted after the initial adjustment, such as when the developer is replaced or when the machine is shipped. Because of the good copy at first, the more you use the copier, the more the carrier ages and the worse the radiation.

In other words, the conventional method adjusts the ratio of toner and carrier only at the time of developer replacement or at the time of shipment of the machine. Therefore, when the carrier is aged, it is necessary to change the ratio of toner and carrier. The problem was caused.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and its purpose is to extend the life of the carrier by correcting the value of the reference core according to the accumulated copy number when increasing the developer properties, thereby increasing the toner content in the developer. The present invention provides a method and a device for correcting a carrier deterioration that allows a radiated image to be kept at a constant level at the same time.

In accordance with one aspect of the present invention, there is provided a method for compensating carrier deterioration, comprising: a first step of counting the number of copies to detect a developer carrier life in an electronic copying machine using a dry developing method; A second step of comparing the copy number count value with a reference copy number value indicating a carrier life to determine whether the copy number count value is the same; A third step of correcting a decrease in carrier characteristics by increasing the amount of toner replenishment by controlling the adjustment magnetic core to rotate 90 ° right from the current position to increase the toner content ratio if the copy number count value and the carrier reference copy number value are the same; Resetting the carrier reference number of copies after the third step to double, and determining whether the value of the accumulated copy number count accumulated so far is the same as the reset reference number of copies; If the copy number count value is equal to the preset carrier reference copy number value, the magnetic core is controlled to be rotated 90 ° to the right so that the toner content ratio becomes higher than the toner content ratio in the third step, thereby increasing the toner replenishment amount. It is characterized by consisting of a fifth step to correct the degradation of the carrier characteristics by increasing again.

In accordance with an aspect of the present invention, there is provided a carrier characteristic deterioration correction apparatus, comprising: an oscillator for outputting an oscillation frequency in an electronic copying machine using a dry development method; A detection transformer which detects a content ratio of the developer by changing the oscillation frequency signal output from the oscillator by the magnetic flux generated in the carrier of the developer; A phase detector for detecting a phase difference of the current detected from the transformer; A voltage comparator for comparing the phase difference of the current detected from the phase detector with a reference voltage; A toner supply control circuit unit for controlling toner supply by a signal output from the voltage comparator; And a toner supply motor configured to be controlled on / off according to a control signal of the toner supply second circuit unit to adjust an amount of toner supply.

1 is a block diagram of a carrier deterioration correction device of the present invention.

2 is a diagram showing output waveforms of a detection transformer and a phase detector according to toner concentrations.

3 is a diagram in which a stepping motor is mounted on an adjustment screw.

4 is a flow chart for the present invention.

* Explanation of symbols for main parts of the drawings

1: Oscillator 2: Primary Coil of Trans

3,4: secondary coil of transformer 5: detection transformer

6: primary coil detection surface 7: secondary coil detection surface

8: phase detector 9: voltage comparator

10: toner supply control circuit unit 11: toner supply motor

12: Magnetic core for adjustment

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an apparatus for compensating carrier deterioration. As shown in FIG. 1, an oscillator 1 for outputting an oscillation frequency and an oscillator output from the oscillator 1 by magnetic flux generated in a carrier are shown in FIG. A detection transformer 5 for detecting a content ratio of a developer (toner + carrier mixed powder) by changing a signal, and a phase detector 8 for detecting a phase difference between two current signals detected from the detection transformer 5; A voltage comparator 9 for comparing the phase difference of the current detected from the phase detector 8 with the reference voltage Vref, and a toner supply control circuit section for controlling toner supply by a signal output from the voltage comparator 9; And a toner supply motor 11 that is turned on / off in accordance with the control signal of the toner supply control circuit section 10.

The detection transformer 5 for detecting the content ratio of the developer comprises a primary coil 2 on the H-shaped iron core, i.e., the detection surface 6 and 7, in order to form a magnetic loop passing through the developer powder powder. ) And the secondary coils (3) and (4) are wound so that the magnetic flux passes through the developer powder powder, and on the lower side of the H-shaped core opposite to the detection surfaces (6) and (7), an adjustment magnetic core is formed. The magnetic flux is configured to pass.

Referring to the operation of the present invention configured as described above according to Figures 1 to 4 as follows.

First, as shown in FIG. 1, the primary side coil 2 and the secondary side coil (2) of the transformer 5 are detected so as to detect the content ratio of the developer (toner + carrier mixed powder) so that the radiated image can be maintained at a constant level. 3) (4) between the magnetic core 12 for adjustment and the detection surface (6) (7), the magnetic core 12 to move by configuring the magnetic core for adjustment (12) to be movable. (2) (3) (4), the magnetic magnetic inductance increases from the adjustment magnetic core 12, so that the content of toner concentration on the developer is less detected. On the contrary, the coils 2, 3, 4 and magnetic core ( 12) If the distance increases, adjust the toner concentration replenishment amount a lot.

The phase detector 8 detects the AC wave output phase of the adjustment magnetic core 12 and the AC wave output phase of the detection surface 7 and outputs the detected phase difference to the voltage comparator 9. The voltage comparator 9 compares the reference voltage and the signal output from the phase detector 8 and outputs a high signal when the phase difference is not zero. The toner supply control circuit unit 10 receiving the high signal drives the toner supply motor 11.

Therefore, the toner supply motor 11 is driven until the signal of the loop through the developer and the loop through the adjustment magnetic core 12 becomes 0, and then the adjustment magnetic core 12 according to the accumulated copy number. Is corrected, thus increasing the toner content ratio in the developer.

In this state, the number of copies is counted from the CPU, which is not shown in the drawing, and the number of copies is 10,000 (the standard copy number for judging the life of the carrier), and the adjustment magnetic core is 20,000. Since the position of (12) is shifted by 90 ° to the right, the deterioration of the characteristics of the carrier is corrected.

FIG. 2 shows the phase difference of each waveform output to the transformer 5 and the phase detector 8 according to the toner concentration.

3 and 4 are related to the magnetic core adjustment method, and as shown in FIG. 3, a stepping motor is mounted on the left side of the adjustment screw and accumulated in the CPU shown in the drawing. The developer carrier life is counted by counting the number of copies (step 1).

Then, it is determined whether the accumulated copy number count value and the carrier reference life (for example, 10000 sheets) are the same (step 2), and if it is the same, the adjustment magnetic core 12 is rotated 90 degrees to the right (step 3).

When the adjustment magnetic core 12 is rotated 90 ° to the right, the magnetic magnetic inductance increases as the adjustment magnetic core 12 and the coil 4 are close, and the output of the coil 4 is detected by detecting the toner concentration content ratio less. The differential outputs of the secondary coils 3 and 4 are output as shown in FIG. 2 smaller than the output of the coil 3.

Subsequently, after adjusting the adjustment magnetic core 12 as described above, if the accumulated copy number is counted and the copy number count value reaches twice the carrier reference life (20,000 copies), the adjustment magnetic The core 12 is rotated 90 ° again to the right to rotate 180 ° (1/2 rotation) so that the toner density is further increased to correct the carrier deterioration (step 5).

Here, when the adjustment magnetic core 12 is rotated to 90 ° right again, the toner concentration ratio is less detected. Therefore, the detection signal of the differential output of the secondary coils 3 and 4 becomes + as shown in FIG. The circuit unit 10 drives the toner supply motor 11 more than before to increase the toner concentration.

On the other hand, when the carrier is replaced, the magnetic core is automatically repositioned by supplying a signal to the stepping motor when setting the simulation (when setting the developer adjustment value) to automatically return to the original position. The copy count is also initialized and restarted.

As described above, the present invention corrects the value of the reference core according to the number of copies of the developer when the characteristics of the developer decrease, thereby increasing the toner content in the developer, thereby extending the life of the carrier and simultaneously maintaining a constant copy image at a constant level. It is effective.

Claims (4)

An electronic copying machine using a dry development method, comprising: a first step of counting the number of copies to detect a developer carrier life; A second step of comparing the copy number count value with a reference copy number value indicating a carrier life to determine whether the copy number count value is the same; A third step of correcting a decrease in carrier characteristics by increasing the amount of toner replenishment by controlling the adjustment magnetic core to rotate 90 ° right from the current position to increase the toner content ratio if the copy number count value and the carrier reference copy number value are the same; Resetting the carrier reference number of copies after the third step to double, and determining whether the value of the accumulated copy number count accumulated so far is the same as the reset reference number of copies; If the copy number count value is equal to the preset carrier reference copy number value, the magnetic core is controlled to be rotated 90 ° to the right so that the toner content ratio becomes higher than the toner content ratio in the third step, thereby increasing the toner replenishment amount. A method for correcting carrier deterioration in an electronic copy machine, comprising: a fifth step of correcting a deterioration of carrier characteristics by increasing the carrier; In the electromagnetic copying machine using the dry development method, the content of the developer is changed by changing the oscillation frequency signal output from the oscillator 1 by the oscillator 1 outputting the oscillation frequency and the magnetic flux generated from the carrier of the developer. A phase transformer 8 for detecting a phase difference of the current detected from the transformer 5, a phase transformer 8 for detecting a phase transformer 8, and a phase difference between a current detected from the phase detector 8 and a reference voltage On / off according to the control signal of the voltage comparator 9, the toner supply control circuit unit 10 for controlling toner supply by the signal output from the voltage comparator 9, and the toner supply control circuit unit 10 Carrier deterioration correction device in the electronic copy machine, characterized in that it comprises a toner supply motor (11) that is controlled to adjust the toner replenishment amount. The detection transformer (5) according to claim 2, wherein the detection transformer (5) for detecting the content ratio of the developer comprises: a detection surface (6) (7) constituting a magnetic loop passing through the developer powder powder, and the oscillator (1). Characterized in that the primary coil (2) to which the oscillation signal is inputted and the secondary coil (3) (4) in which the signal induced by the magnetic flux generated in the carrier of the developer changes Carrier deterioration correction device in copier. 4. The apparatus according to claim 3, wherein an adjustment magnetic core (12) is formed at a lower end of the H-shaped iron core opposite to the detection surface (6) (7).