JPS61173687A - Motor tuner of electronic copying machine - Google Patents

Abstract

PURPOSE:To tune the rotating operation of a main motor with that of an optical motor by detecting the rotating speed of the motor, calculating the detected rotating speed data, and applying a reference clock in response to the result to a PLL circuit. CONSTITUTION:A rotation detector 17 samples the rotating speed of a rotating main motor M1 in the prescribed time width to detect the speed at every sampling to convert it to digital data, and outputs to a processor 18. The processor 18 takes a moving average, and applies a pulse corresponding to the average as a reference clock to a PLL circuit 19. The PLL circuit 19 outputs a pulse in response to the input clock to drive an optical motor M2. Thus, the rotating operation of the motor M1 can be turned with that of the motor M2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor tuning device for an electronic copying machine. The present invention relates to a motor tuning device for an electronic copying machine that can take the following steps.

(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 58 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 is fused to the recording paper, and the copying 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 optical motor operate independently.

For this reason, when the rotational speed of the main motor changes greatly, the copy quality may deteriorate, such as the copy start position being shifted.

The present invention has been made in view of these points, and
The purpose of this is a motor tuning device for electronic copying machines that enables synchronization between the rotation of the main motor and the rotation of the optical motor by detecting changes in the rotation speed of the main motor and feeding them back to the optical motor. The aim is to realize this.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, includes a main motor that drives a drum and other mechanical parts, and an optical motor that drives an optical system. Detects the change, outputs a pulse corresponding to the change in rotation speed, and sends the pulse to the PLL
It is characterized in that it is used as a reference clock for an optical motor driven by a circuit.

(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 a rotation detection circuit that detects the rotation speed of the main motor M1;
A processing circuit 18 receives the output of the rotation detection circuit 17, performs arithmetic processing, and outputs a pulse corresponding to the input signal.
A PLL 9 receives the output clock of the processing circuit 18 as a reference clock and provides a driving clock to the optical motor M2.
It is a circuit.

As the rotation detection circuit 17, for example, an encoder is used, and as the processing circuit 18, for example, a microcomputer is used. PLL circuit 19 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 rotation detection circuit 17 samples the rotation speed of the rotating main motor M1 in a predetermined time width, detects the rotation speed for each sample, converts it into digital data, and then outputs it.

If a digital tachometer is used as the rotation detection circuit 17, its output immediately becomes digital data of the rotation speed of the main motor M1. When the processing circuit 18 sequentially receives the output data from the rotation detection circuit 17, it performs the following arithmetic processing.

FIG. 2 is a diagram for explaining the present invention in detail. In the figure, the vertical axis is the rotation speed, and the horizontal axis is the time t. In the figure, ``1'' is a diagram showing the rotation speed characteristics of the main motor M1.The rotation detection circuit 17 detects the rotation speed that changes in this way.
Rotation speed data No, NL, N at each sampling time by sampling with a time width Δt from time 1o
2, . . . are measured and sent to the processing circuit 18. The processing circuit 18 takes a moving average as described below and supplies a pulse corresponding to the moving average to one PLL circuit as a reference clock.

The moving average method is as follows. The processing circuit 18 averages the first measurement data Nc and the second measurement data N1 sent from the rotation detection circuit 17.

Based on the calculation result (No +Nt)/2, the processing circuit 18 performs calculation processing, and as a result of the calculation processing, if the number of rotations of the optical motor M2 to be determined is n□, then the number of rotations of the optical motor M2 is NO Output the lock so that P
It is applied to the LL circuit 19.

Next, the processing circuit 18 processes the second measurement data N1 and the third measurement data N1.
A moving average of the measured data N2 is taken. Further arithmetic processing is performed based on the moving average result, and if the number of rotations of the optical motor M2 that is submerged as a result of the arithmetic processing is nl, the processing circuit 18 locks the optical motor M2 so that the number of rotations becomes Nl. It is outputted and given to the PLL circuit 19.

In this way, the PLL circuit 19 is given the reference clock from the processing circuit 18, and the PLL circuit 19 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 rotation speed of the main motor at each sampling time is No + N t + N 21...
・The rotation speed of the optical motor is nO+nl+n2. ..., the following equation holds between these.

no / No = nt /Nt - n 2 /N
2...= 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 Ml and the rotation of the optical motor M2 can be synchronized, problems such as copy images shifting to the left or right 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 was used as the calculation method of the processing circuit 18, 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 detected, the detected rotation speed data is processed, and a reference clock according to the result is set to drive the optical motor. By configuring it to be applied to the driving PLL circuit, it is possible to synchronize the rotational operation of the main motor and the rotational operation of the optical motor. Therefore, the quality of the copied image can always be maintained in a constant and good condition.

[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... Fixing roller 11... Main motor 1
4...Paper feeding mechanism 15...Optical motor 16...
Optical system 17...Rotation detection circuit 18...Processing circuit 1
9... PLL circuit patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima Jigai 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 changes in the rotation speed of the main motor and outputs pulses corresponding to the changes in the rotation speed.
A motor tuning device for an electronic copying machine, characterized in that the pulse is used as a reference clock for an optical motor driven by a PLL circuit.