KR0120107B1 - Control method and circuit of toner loading for electrographic developing system - Google Patents

Abstract

Disclosed is a toner intensity control method for a electronic photograph development machine and circuit thereof. The toner intensity control method for a electronic photograph development machine includes a first step which detects the toner state and compares the toner state with a reference value, a second step which checks the variation of the intensity of the toner by suppling the toner in accordance with the detection result of the first step, and a third step which supplies twice the toner when the variation of the toner intensity decreases and decreases suppling of the toner when the variation of the toner intensity increases. Thus, the toner intensity is properly maintained.

Description

Toner Supply Control Method and Circuit in Electrophotographic Developer

1 is a circuit diagram according to an embodiment of the present invention.

2 is a concentration change characteristic diagram according to an embodiment of the present invention.

3 is a toner density control flowchart in a two-component developing method according to an embodiment of the present invention.

The present invention relates to a toner concentration control method and a rotation in an electrophotographic developing device. In particular, the two-component development method is applied, and by adopting a fuzzy theory, when the toner concentration is blurred, the rotation of the toner supply motor is rapidly increased. The present invention relates to a toner supply control method and circuit in an electrophotographic developing apparatus which maintains an appropriate toner concentration by reducing the rotation of a toner supply motor when the toner supply amount is increased and the toner concentration is increased, thereby reducing the toner supply amount.

In the conventional electrophotographic developer, a toner sensor located in the developer detects the toner concentration in the developer, and compares the toner concentration detection value with the reference concentration value in the microcomputer. The result of the comparison is input to the motor driving unit to control the toner supply motor to keep the toner concentration constant. If the toner concentration in the developing device (ratio between toner and carrier) is detected by the toner sensor and is judged to be insufficient compared to the reference density value stored in the microcomputer, the toner supply motor is driven to develop the toner in the toner hopper. Supply in the chamber 16. On the contrary, when it is determined that the concentration value is higher than the reference concentration value, the toner supply motor is stopped to stop supplying the toner, thereby making the toner concentration in the developing chamber in the developer constant. However, the toner concentration in the developing chamber is a method of detecting or supplying toner by detecting the toner sensor compared with the standard concentration value. Therefore, when copying a dark background document, the amount of toner consumed is larger than the amount of toner supplied in the developing chamber 16. There was a problem that can not be controlled to the reference concentration.

Accordingly, an object of the present invention is to change the number of rotations of the toner supply motor based on the change of the existing developer in the structure using the two-component development method, thereby minimizing the deviation from the proper concentration of the toner concentration, so that the toner concentration in response to various originals is reduced. It is to provide a method and a circuit for uniformity.

The present invention for achieving the above object is to detect the toner state to drive the toner supply motor at a high speed so that the toner supply amount when the lower than a predetermined reference value, and the speed of the toner supply motor so that the toner supply amount is supplied when the toner supply value is higher than the predetermined reference value It is characterized in that the toner concentration is thus configured to maintain the proper concentration at all times.

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

It should be noted that the same parts in the figures represent the same reference signs wherever possible. It will be apparent to those skilled in the art that the same configuration as in FIG. 1 is used for the preferred embodiment of the present invention.

1 shows a toner supply roller 14 which detects the toner concentration in the developing time 16 by the toner sensor 12 in the developing device 10 and supplies the toner in the toner hopper 15 in the developing chamber 16; The agitation roller 13 for mixing the toner and the carrier in the developing chamber 16, the magnetic roller 11 for developing the toner, and the toner amount detection output detected by the tono sensor 12 are noisy by noise. A sensing output circuit 50 for providing a stable signal to the microcomputer 20 at a later stage, a toner supply motor 30 for controlling the toner supply, and a toner supply motor for driving the toner supply motor 30. And a microcomputer 20 for controlling the supply of toner by adjusting the driving rotation of the toner supply motor 30 from the sensing signal for the amount of toner from the output of the sensing output circuit 50. have.

The sensing output circuit 50 is composed of resistors R1-R3, transistors Q1, and diodes D1. The detection signal of the toner sensor 12 is removed through the resistor R1 and the capacitor C1 to remove noise included in the detection signal by RC time constant, and the resistor R2 drives the transistor Q1. The output via the transistor Q1 is configured such that the output of the load resistor R3 is applied to the microcomputer 20, and a diode D1 connected between the emitter and the collector of the transistor Q1 occurs in the set. It is to protect the microcomputer 20 by bypassing an over stress signal higher than the voltage of the power supply terminal Vcc.

2 is a characteristic diagram according to automatic toner concentration control in an embodiment of the present invention.

3 is a flowchart of automatic toner density control according to an embodiment of the present invention.

When the detected signal is not higher than the reference value by comparing the detected signal value with the reference value by detecting the toner state, the toner concentration is returned because the toner concentration is dark, and when it is high, the toner supply motor first increases since the toner concentration is blurred. By comparing the first step of increasing the toner supply with the first step of increasing the toner supply, and detecting whether the toner is supplied again from the toner supplied in the first step, the first step is returned to the first step. A second step of maintaining the rotational speed of the toner supply motor at a previous state and increasing the toner concentration to a more blurred state in a second step, thereby increasing the rotational speed of the toner supply motor in a second step more than in the first step to supply more toner. And detecting the toner state again from the toner supplied in the second process and passing the first set value V1 from the reference value to the second set value V. 2) If it is higher than the lower one, it is fed back to the second process. If the rotational speed of the toner supply motor is maintained at the previous state, if the toner density is high, the toner concentration is blurred. A third process of supplying more toner by doubling the second process, and detecting a toner state again from the toner supplied in the third process, passing the second set value V2, and then passing the third set value. If it is higher than V3, it is fed back to the third process to maintain the rotational speed of the toner supply motor in the previous state, and if it is high, the toner concentration is further blurred, and the toner is not supplied normally. It consists of a fourth process of indicating that there is no.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3, in step 301, the output voltage of (12) is sensed by the microcomputer 20 through the sensing output circuit 50. After reading through an analog-to-digital converter (ADC), it is compared whether the sensed value read in step 302 is higher than the reference output voltage as shown in FIG. If the concentration is higher than the standard concentration, the motor driver 40 is driven through the output port PA of the microcomputer 20 in step 303 so that the rotational speed of the toner supply motor 30 is increased to 10 rpm in the first step. By increasing, the toner in the toner hopper 15 is further supplied to the developing chamber 16. However, if it is not higher than the reference voltage in step (302), the state is darker than the reference concentration, and the process goes to step (311). According to the process of step 303, the toner sensor 12 detects the change in the concentration of the toner and provides it to the microcomputer 20 through the sensing output circuit 50. It is compared whether the sensed voltage is higher than the voltage of the first set value V1 past the reference voltage. At this time, if it is lower than the voltage of the first set value (V1), and maintains the rotational speed of the toner supply motor 30 as compared to the reference voltage again in step 302, if it is higher than the voltage of the first set value (V1) Since the amount consumed is larger than the amount of toner supplied into the developing chamber 16 (that is, the concentration tends to decrease gradually at the reference density), the rotation speed of the toner supply motor 30 is increased in step 305 than in step 303. Drive at 20 rpm to rotate faster. Here, the numerical value of the drive rpm (10 rpm, 20 rpm, etc.) of the toner supply motor 30 is not specifically fixed, and may vary depending on the system situation. In step 306, the voltage of the toner sensor 12 is again compared with the voltage of the second set value V2 higher than the voltage of the first set value V1. When the voltage is lower than the voltage of the second set value V2), the rotation speed of the toner supply motor 30 is maintained at the previous state by comparing with the first set value V1 again in step 304. If the voltage is higher than the set value V2, the consumption of the developing chamber 16 is much higher than that supplied from the toner hopper 15, that is, the density tends to decrease further. The toner supply is doubled by driving the rotation speed of 30 to 30 rpm faster. In the next step 308, it is compared whether the detection voltage of the toner sensor 12 is higher than the voltage of the third set value V3. If it is lower than the voltage of the third set value (V3), and compared to the voltage of the second set value (V2) again in step 306 to maintain the previous state, and if the voltage is higher than the voltage of the third set value (V3) Even if the toner supply motor 30 continues to increase, the toner concentration does not increase. Therefore, it is determined that there is no toner in the toner hopper 15 (309). Make.

As described above, when the toner concentration control in the two-component developing method goes to the reduced or increased state in the developing chamber 16, if the drive speed of the toner supply motor 30 is controlled by varying the number of finishes (dark document) Toner density can be kept constant irrespective of copying an original of an original).

As described above, when the toner concentration in the developing chamber 16 decreases, the toner supply motor 30 is quickly turned to supply a large amount of toner, and when the toner concentration is lower than the reference concentration and increases toward the reference concentration, the toner supply motor. The toner supply amount can be reduced by slowly turning 30, and the toner concentration can be controlled by varying the toner supply amount corresponding to the toner consumption amount consumed in the developing chamber 16. That is, there is an advantage that can maintain a constant toner concentration in response to various originals

Claims (2)

The toner sensor 12 in the developing device 10 detects the toner concentration in the developing chamber 16, and supplies the toner in the developing chamber 16 to the toner in the developing chamber 16, and the developing chamber. A stirring roller 13 for mixing the toner and the carrier in the 16, a magnetic roller 11 for developing the toner, the toner supply motor 30, the toner supply motor driver 40, and overall control In the toner supply control circuit of the electrophotographic developer having the microcomputer 20, the resistors R1 and R2 and the capacitor C1 are connected to the output terminal of the toner sensor 12 to remove noise of the detection signal. A base of the signal driving transistor Q1 is connected from the resistor R2, an overstress signal bypass diode D1 is connected between the collector of the transistor Q1 and the emitter, and the emi of the transistor Q1 is connected. Characterized in that connecting the input terminal of the microcomputer 20 to the Is a toner supply control circuit of an electrophotographic developer. A toner supply control method of an electrophotographic developing apparatus, comprising: detecting a toner state and comparing a detected signal value with a reference value, when the detection signal is not higher than the reference value, the toner concentration is dark; A first step of increasing the number of rotations of the toner supply motor to increase the toner supply first, and detecting the toner state again from the toner supplied in the first step and determining whether the toner supply motor is higher than the first set value V1. In comparison, when the toner supply motor is rotated by the first process, the rotation speed of the toner supply motor is maintained in the previous state, and when it is high, the toner concentration becomes more blurred. A second process of supplying more toner by further increasing the amount of toner; When the reference value is higher than the second set value V2 after passing through the first set value V1, the low value is fed back to the second process to maintain the rotational speed of the toner supply motor in the previous state, and when it is high, the toner density is further blurred. In the third step, the third step of multiplying the number of rotations of the toner supply motor in the third step increases the number of revolutions of the toner supply motor in the third step, and further supplies the toner. When it is detected and compares whether the second set value (V2) is higher than the past third set value (V3), if it is low, it is fed back to the third process to maintain the rotational speed of the toner supply motor in the previous state. 4. The toner supply control method of the electronic lithography apparatus of claim 4, further comprising a fourth step of indicating that there is no toner in a state in which the toner is not supplied normally.