JPS61173689A - Motor tuner of electronic copying machine - Google Patents

Abstract

PURPOSE:To tune a main motor and an optical motor by calculating the rotating speed of the motor from that of a drum, calculating the calculated rotating speed data, and applying a reference clock in response to the result to a PLL circuit for driving the optical motor. CONSTITUTION:Since a drum 12 is driven by a belt drive or gear drive by a main motor M1, the rotating speed of the drum 12 is proportional to that of the motor M1, and the rotating speed of the motor M1 can be calculated from that of the drum. A processor 20 takes a moving average of the second main motor speed data N1 and the third main motor speed data N2. It is further calculated with the average result as a base, and if the speed of an optical motor M2 obtained as a result of the calculation is N1, the processor 20 outputs a clock to becomes that the rotating speed of the motor M2 is N1 to a PLL circuit 21. Thus, the motor M2 is tuned and driven.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor control device for an electronic copying machine. The present invention relates to a motor tuning device for an electronic copying machine in which a relationship can be established.

(Prior Art) An electronic copying machine exposes a charged drum to light in accordance with document information, and then forms a toner visible image on an electrostatic latent image formed on the drum surface. This is a device that transfers the image onto recording paper. In recent years, this type of electronic copying machine has been widely used for copying information in all fields of industry. Recent electronic copying machines are commercially available that not only automatically copy a preset number of copies, but also have a zoom function for enlarging and reducing images.

FIG. 3 is a diagram showing an example of the configuration of a conventional electronic copying machine of this type. When the operator presses a copy start button (not shown), the illustrated device begins a copy operation. After the remaining toner on the drum 1 is scraped off by a blade in the cleaning section 2 and the drum 1 is rotating in the direction of the arrow, it is corona discharged by the charging electrode 3 and the entire surface of the drum 1 is charged with charges of seeds. It will be done.

The charges charged by the charging electrode 3 are transferred to a charge erasing section 4.
The charges in unnecessary parts are erased. Thereafter, the charged area of the drum 1 is exposed to an optical image signal, and an electrostatic latent image of the original image is formed on the drum surface. The electrostatic latent image formed on the drum surface is converted into a visible image by adsorption of toner in the subsequent phenomenon section 5. The toner image on the drum surface is transferred onto the recording paper in the transfer section 6, and the recording paper that is in close contact with the drum 1 is separated. The separated recording paper is sent to the fixing roller 8 via the conveyance mechanism 7, and the recording paper is heated and pressurized by the fixing roller 8, so that the toner on the recording paper becomes the recording paper! ! ! !
The copy operation is completed.

(Problems to be Solved by the Invention) This type of electronic copying machine has a main motor for driving a drum and other mechanical parts (for example, a fixing roller part, a paper feeding mechanism, etc.), and a main motor for transmitting image information to a drum charging part. Two optical motors are used to drive the optical system for scanning exposure. An induction motor is used as the main motor, and a DC motor is used as the optical motor.
is used.

Although the rotation speed of the main motor changes due to changes in the power supply voltage and the influence of the load, the rotation speed N of the main motor and the rotation speed n of the optical motor should originally have a constant relationship. That is, the relationship n/N-K (K is a constant) must hold between N and n. However, in the conventional device, there is no means for feeding back changes in the rotational speed of the main motor to the optical motor, and the main motor and the optical motor operate independently. For this reason, when the rotational speed of the main motor changes greatly, the copy start position may shift, resulting in a reduction in copy quality.

The present invention has been made in view of these points, and
The purpose of this is to indirectly detect changes in the rotation speed of the main motor and feed it back to the optical motor, thereby making it possible to synchronize the rotation of the main motor and the optical motor. The object of the present invention is to realize a motor tuning device.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, includes a main motor that drives the drum and other mechanical parts, and an optical motor that drives the optical system. The system is configured to detect and calculate a change in the rotational speed of the main motor, output a pulse corresponding to the calculated change in the rotational speed of the main motor, and use the pulse as a reference clock for an optical motor driven by a PLL circuit. It is characterized by:

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. In the figure, 11 is a drum 12. The main motor M1 drives the fixing roller 13, the paper feeding mechanism 14, and other mechanical parts not shown. 15 is an optical system (for example, a scanning optical system)
16 is an optical motor M2 that drives the optical motor M2. As the main motor M1, for example, as described above, an induction motor is used, and as the optical motor M2, a DC motor is used.

17 is an encoder fixed to the rotating shaft of the drum 20 and has teeth for pulse detection along the circumference; 18 is a photosensor arranged along the edge of the encoder 17; and 19 is an encoder of the photosensor 18. This is an amplifier circuit that amplifies the output, shapes the waveform, and outputs pulses. The output of the amplifier circuit 19 is
In addition to being used as a control pulse to control the original copying machine,
The processing circuit 20 is entered. The processing circuit 20 receives the output of the amplifier circuit 19, performs arithmetic processing, and outputs a pulse corresponding to the input signal. 21 is a PLL circuit which receives the output clock of the processing circuit 20 as a reference clock and provides a driving clock to the optical motor M2. As the photosensor 18, for example, a photodiode is used, and as the processing circuit 20, for example, a microcomputer is used.

PLL circuit 21 is realized using known technology.

The operation of the circuit configured as described above will be explained as follows.

When the operator presses the copy start button, the copier starts the copying operation. That is, the main motor M1 and the optical motor M2 start rotating. The main motor M1 rotates the drum 12 and the fixing roller 13 and drives the paper feed mechanism 14, and the optical motor M2 drives the optical system 16. The photosensor 18 outputs a pulse signal according to the number of rotations of the rotating drum 12. The amplifier circuit 19 amplifies this photosensor output, shapes the waveform, and supplies it to the processing circuit 20.

The processing circuit 20 measures the number of rotations of the drum 12 by counting the output pulses of the amplifier circuit 19.

Since the drum 12 is driven by a belt drive or a gear drive from the main motor M1, the number of rotations of the drum 12 and the number of rotations of the main motor M1 are in a proportional relationship.

Therefore, if the rotation speed of the drum 12 is known, the rotation speed of the main motor M1 can be calculated. In this way, the processing circuit 2o calculates and obtains the rotation speed of the main motor M1 from the rotation speed of the drum 12. At every certain time interval Δ, the main motor M
If you calculate the number of rotations of 1st and plot the results, the 2nd
A curve showing the rotation speed characteristics of the main motor M1 as shown at f't in the figure is obtained. In the figure, the vertical axis is the rotation speed, and the horizontal axis is the time t. The processing circuit 20 takes a moving average as shown below, and supplies a pulse corresponding to the moving average to the PLL circuit 21 as a reference clock.

The moving average method is as follows. The processing circuit 20 uses the calculated first main motor rotation speed data No.
The average is taken with the main motor rotation speed data N1. Based on the calculation result (No+Nt)/2, the processing circuit 20
performs arithmetic processing, and as a result of the arithmetic processing, if the rotational speed of the optical motor M2 obtained is set to no, a lock signal is output and applied to the PLL circuit 21 so that the rotational speed of the optical motor M2 becomes NO.

Next, the processing circuit 20 takes a moving average of the second main motor rotation speed data N1 and the third main motor rotation speed data N2. Further calculation processing is performed based on the moving average result, and if the rotation speed of the optical motor M2 that is submerged as a result of the calculation processing is nl, the processing circuit 20 locks the optical motor M2 so that the rotation speed becomes N1. It is outputted and given to the PLL circuit 21.

In this way, the PLL circuit 21 is given a reference clock from the processing circuit 20, and the PLL circuit 21 outputs pulses according to the input clock to drive the optical motor M2. As a result, the rotational speed of the optical motor M2 changes as shown at f2 in FIG. The rotational speed of the main motor at each sampling time is No, Nt, N2,...
, the rotational speed of the optical motor is n. +nl, n2,...
・The following equation holds between these.

no /No = nt /Nt - n 2 /N2
-= That is, when the rotational speed of the main motor M1 changes due to fluctuations in the power supply, etc., the optical motor M2 also changes in synchronization with the change. Therefore, according to the present invention, since the rotation of the main motor M1 and the rotation of the optical motor M2 can be synchronized, problems such as copy images shifting to the left or right side of the recording paper can be avoided. Does not occur. That is, a copy image of constant quality can always be obtained.

In the above description, the moving average method is used as the calculation method of the processing circuit 20, but the present invention is not limited to this method, and the differential method and other calculation processing methods can be used.

(Effects of the Invention) As described above in detail, according to the present invention, the rotation speed of the main motor is calculated from the rotation speed of the drum, the calculated rotation speed data is processed, and a standard is set according to the result. By configuring the clock to be applied to the PLL circuit that drives the optical motor, it is possible to synchronize the rotational operation of the main motor and the optical motor. Therefore, the quality of the copied image can always be maintained in a constant and good condition.

Furthermore, since the present invention utilizes the conventional drum rotation speed detection mechanism as is, it can be realized without increasing the number of parts, which is convenient.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of a processing circuit, and FIG. 3 is a diagram showing an example of the configuration of an electronic copying machine. 1.12...Drum 2...Cleaning section 3.
...Charging electrode 4...Charging erasing section 5...Developing section 6...Transfer section 7...Transportation mechanism
8.13...Fuser port-ra 11...Main motor 1
4...Paper feeding mechanism 15...Optical motor 16...
Optical system 17...Encoder 18...Photo sensor 19...Amplification circuit 20...Processing circuit 21.
... PLL circuit patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 1 person

Claims (1)

[Claims] It is equipped with a main motor that drives the drum and other mechanical parts, and an optical motor that drives the optical system, and detects the number of rotations of the drum and calculates the change in the number of rotations of the main motor. 1. A motor tuning device for an electronic copying machine, characterized in that the motor tuning device for an electronic copying machine is configured to output a pulse corresponding to the above, and use the pulse as a reference clock for an optical motor driven by a PLL circuit.