JPH0453653Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application) This invention controls the on/off timing of the dispense motor of a copier to dispense toner regardless of whether the commercial power source is 50Hz or 60Hz. The present invention relates to a dispense motor control device that can automatically keep the amount constant.

(Prior Art) If the mixing ratio of toner and carrier in a developing machine of a copying machine is not constant, the copy density will vary. For this reason, it is necessary that the amount of toner consumed in the developing machine is supplied from the toner box so that the mixing ratio of toner and carrier is always constant.

As a well-known means for transporting toner from a toner box to a developing machine, there is a toner auger.
The toner auger is driven by a dispense motor, and the amount of toner delivered by the toner auger is determined by the rotational speed of the dispense motor. Therefore, it is necessary to keep the number of revolutions per unit time of the dispense motor constant.

By the way, as is well known, the frequency of commercial power supply is 50Hz in Kanto and 60Hz in Kansai. Therefore, if you take a copying machine that was adjusted so that the dispense motor rotates an appropriate number of times using a commercial power source in Kansai to Kansai, the dispense motor will rotate at a different number of revolutions and you will be able to obtain good copies. I won't be able to do it.

For this reason, in the past, copying machines were divided into those for the Kanto region and those for the Kansai region, and each was equipped with a 50Hz-specific dispense motor or a 60Hz-specific dispense motor. However, a copying machine with such a configuration has the disadvantage that it cannot be moved from a 50Hz area to a 60Hz area or vice versa.

In order to solve this drawback, the dispense motor is equipped with a 50Hz and 60Hz selector switch, and by switching the switch according to the frequency of the commercial power supply, it is possible to
There is a copying machine that has a dispense motor that can obtain a constant rotational speed even if it is Hz.

However, with this copying machine, the user had to check the commercial power supply frequency and select a changeover switch, which was troublesome and required a changeover switch, which increased the cost.

(Purpose) The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to automatically turn the dispense motor on and off according to the frequency of the power supply without the user having to flip a switch. An object of the present invention is to provide a dispense motor control device that changes the timing so that the amount of toner dispensed is constant.

(Summary) In order to achieve the above object, the present invention provides a dispensing motor control device that controls the amount of toner dispensed in an electronic copying machine. means for rotating and stopping the dispense motor at a predetermined duty corresponding to the determination result of the means, and outputting a dispense motor control signal for controlling the number of rotations per fixed time; and a power switch for a dispensing motor which is controlled on and off by a control signal output from the means, and by changing the on and off timing of the dispense motor, regardless of the frequency of the power supply, The feature is that the dispense amount is constant.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit diagram of an embodiment of the present invention. Further, FIG. 2 shows a time chart of the main parts of the signals in FIG. Note that a to c in FIG. 2 indicate signals corresponding to a to c in FIG. 1.

In the figure, a 50/60Hz signal a is input to terminal 1. This 50/60Hz signal a is generated by a known means (for example, the main CPU),
For example, the signal indicates a high level (H level) when the copying machine is connected to a 50 Hz commercial power supply, and a low level (L level) when the copying machine is connected to a 60 Hz commercial power supply. Furthermore, a motor-on signal b is input to the terminal 2. It is assumed that this signal b is on at L level.

These signals a and b are input to the one-chip microcomputer 3. From the one-chip microcomputer 3, when the motor-on signal b is at L level, the 50/60Hz signal a is output.
A microcomputer output signal c with a duty corresponding to 1 is output.

That is, as shown in Figure 2, the time
At _t1 , the motor-on signal b becomes L level, and if the copying machine is connected to a 50Hz commercial power supply at this time, the one-chip microcomputer 3 outputs the first duty pulse signal _C1 . Also, time t ₂
If the copying machine is connected to a 60 Hz commercial transmission, a second duty pulse signal _C2 is output from the one-chip microcomputer 3.

The microcomputer output signal c turns on the switching transistor 4 during the H level period, and operates the relay 5 during this period. When the relay 5 is activated, a switch 6 of the dispense motor 7 connected to the commercial power source is turned on, and the motor 7 is supplied with electric power and rotates a predetermined number of times. On the other hand, while the microcomputer output signal c is at L level, the switching transistor 4 is turned off, the relay 5 is deactivated, and the switch 6 is turned off. Therefore, the dispense motor 7 stops rotating.

As the dispense motor 7, for example, a synchronous motor is used. Therefore, when the dispense motor 7 is connected to a 50 Hz commercial power source, the rotation speed is smaller than when it is connected to a 60 Hz commercial power source. Therefore, as shown in Figure 2c, the duty of the microcomputer output signal c is the value when connected to a 50Hz commercial power source, and the value when connected to a 60Hz commercial power source. is chosen to be an appropriate value larger than . As a result, the same amount of toner can be dispensed no matter which frequency power source the dispense motor 7 is supplied with.

Next, as shown in Figure 2c, the H level period of the first duty pulse signal _C1 is
Ton1, the L level period is Toff1, the H level period of the second duty pulse signal _C2 is Ton2,
The function of the one-chip microcomputer 3 will be explained with reference to the flowchart of FIG. 3, assuming the L level period as Toff3.

Step S1...It is determined whether the 50/60Hz signal a is at H level or not. If the answer is yes, proceed to step S2, and if the answer is no, proceed to step S4.

Step S2...The counter is reset and the count value T=0.

Step S3...In the register, T1=Ton1, T2
= Ton1 + Toff1 is stored.

Step S4...Same as step S2, the counter is reset and the count value T=0.

Step S5...In the register, T1=Ton2, T2
=Ton2+Toff2 is stored.

In addition, the above-mentioned Ton1, Toff1 and Ton2,
Toff2 is a value determined so that the dispense motor 7 supplies an equal amount of toner using commercial power sources of 50 Hz and 60 Hz, respectively, and is a value determined in advance by calculation or the like.

Step S6...It is determined whether the motor-on signal b input from terminal 2 is at L level or not. And if yes, step S7
Proceed to and if no, exit.

Step S7...The counter is counted up.

Step S8...The count value T of the counter is
A determination is made as to whether or not it is below T1. and,
If yes, proceed to step S9; if no, proceed to step S10.

Step S9...The microcomputer output signal c at H level is output.

Step S10...The counter value T of the counter is T1
A determination is made as to whether the condition <T≦T2 is satisfied. If yes, proceed to step S11,
If no, return to step S1.

Step S11...The microcomputer output signal c at L level is output.

As is clear from the above explanation, according to this embodiment, the frequency of the power supply connected to the copying machine is 50/60.
The rotational speed of the dispense motor is automatically determined by the Hz signal a, and the rotation speed of the dispense motor is automatically controlled by the microcomputer output signal of the connected duty according to the frequency. Therefore, the user does not have to operate the changeover switch attached to the motor according to the frequency of the power source, unlike the conventional device, and there is an effect that the operation is easy and there is no possibility of copying errors.

(Effects) As is clear from the above description, according to the present invention, the following effects are achieved.

(1) According to the dispense motor control device of the present invention, the rotation speed of the dispense motor is automatically obtained according to the frequency of the power supply, so the user can:
There is no need to pay any attention to the frequency of the power supply, and the operation is simple.

(2) Costs are reduced because a single or common motor can be used and no changeover switch is required.

(3) With conventional devices, if you forget to change the motor selector switch according to the frequency of the power supply, the copy density becomes darker or lighter, resulting in erroneous copies, but with this invention, there are no erroneous copies. .

[Brief explanation of the drawing]

Fig. 1 shows a circuit diagram of an embodiment of the present invention, Fig. 2 shows a timing chart of signals of the main parts of the circuit shown in Fig. 1, and Fig. 3 shows a flowchart for explaining the functions of a one-chip microcontroller. . 3...One-chip microcomputer, 5...Relay, 7
...Dispense motor.

Claims (1)

[Claims for Utility Model Registration] In a dispense motor control device for controlling the amount of toner dispensed in an electronic copying machine, means for determining whether the frequency of a connected power source is 50 Hz or 60 Hz based on the signal level; means for outputting a dispense motor control signal for rotating and stopping the dispense motor at a predetermined duty corresponding to the determination result and controlling the number of rotations per fixed time; and control output from the means. Equipped with a power switch for the dispense motor that is controlled on and off by a signal, and by controlling the on and off timing of the dispense motor, the amount of toner dispensed is automatically controlled regardless of the frequency of the power supply. A dispense motor control device characterized in that the dispensing motor control device is configured to maintain a constant value.