JPS6090347A - Driving motor controlling system of copying machine - Google Patents

Abstract

PURPOSE:To prevent a fact that a recycle toner stays in a developing part and the development is executed as ground contamination on a picture, by synchronizing the driving timing of a motor for driving a photosensitive body and a motor for driving the developing part. CONSTITUTION:In a copying machine provided with a recycling device of a toner which returns to a developing part 4 through a toner collecting pipe 13 from a cleaning part 12, when a printing SW is turned on, normal open terminals RA1-1, RA1-2 of a relay contact conduct, by which a photosensitive body driving motor 18 and a development driving motor 19 are operated synchronously. In this way, when a photosensitive body 1 rotates, a developing roller 5 also rotates simultaneously, therefore, a recycling toner is also stirred enough, and also even if the developing roller 5 is rotated, the development is not executed since no charge exists in a part in which there is no electrostatic latent image, and accordingly, even if the developing roller and the photosensitive body are rotated simultaneously, no failure occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a drive motor control system for a copying machine equipped with a motor that drives a photoreceptor and a motor that drives a developing section.

(Prior Art) FIG. 1 shows the internal structure of a copying machine equipped with a toner recycling device.

In the figure, 1 is a photoreceptor drum, and around it, in order of process, there is a charging section 2, an exposing section 3, a developing section 4, a transfer section IO.
1, a separating section 11, a cleaning section 12, and a static eliminating section 14 are provided.

The developing section 4 is composed of a developing roller 5, a developer stirring roller 6, toner 7 in a toner cartridge 9, and a toner replenishment roller 8. Also, a toner recovery pipe 13 is connected to the developing section 4 from the cleaning section 2. Toner recycling is now being carried out in many areas.

Then, when the print button is pressed, the photoreceptor l is rotated, and charging and exposure are started to form a latent image from the leading edge of the document.
When the electrostatic latent image reaches the developing section, the developing roller 5 is rotated to visualize it. Further, the cleaning section 12 collects the toner remaining on the surface of the photoreceptor drum 1, and transfers it to the developing section 4 through the toner collecting vibrator 13.
I'll set it back to 5.

By the way, conventionally, only when developing the electrostatic latent image on the photoreceptor,
The motor that drives the developing section was driven, but if this is equipped with a toner recycling device, the surface of the C drum 1 will be cleaned/gleaned by the cleaning section 12 while the photo conductor drum 1 is rotating. Therefore, the toner collected during this period is returned to the developing section. Therefore, even if the motor that drives the developing section is stopped, the toner is returned from the cleaning section, so that recycled toner accumulates in a certain portion of the developing section. Since this accumulated toner is developed during the next copy, there has been a conventional drawback that more toner than a predetermined amount may appear as background stains on the image.

This is due to the fact that the drive timings of the photoreceptor drive motor and the development drive motor, which will be described later, are different, as shown in FIG. 30).

That is, in the conventional copying process of charging → exposure → development → transfer/separation → cleaning → static electricity removal, the photoconductor drive motor is rotated at the same time as the print button is pressed to remove static electricity from the surface, and then charging and exposure are performed. This is because the developing section 4 is driven, that is, the developing roller 5, developer catching roller 6, and toner replenishing roller 8 are rotated only after the leading edge of the latent image reaches the developing section 4.

(Purpose) The present invention has been made in view of the drawbacks of the conventional examples, and the problem is that recycled toner accumulates in the developing section and when developing the electrostatic latent image on the photoreceptor, more than a predetermined amount of toner is developed. The purpose of this is to prevent background stains from being developed on the image.

(Structure) The motor control system of the present invention will be explained below based on the circuit diagram of an embodiment shown in FIG. 2 and the timing chart shown in FIG.

In Fig. 2(a), 15 is AC100Vt! Source, 16
is a breaker, 17 is a main switch provided between two signal lines, and a power supply 15 is connected to a photoreceptor drive motor 18 (Ml), a development drive motor 19 (M2),
An AC load 20 is connected in parallel, and both motors have a normal oven terminal RAI-1 of a relay contact, which will be described later.
RAI-2 is provided in series.

AClooV is dropped by a transformer 21, rectified by a rectifier 22, made into DC 24V by a regulator 23, and applied to DC loads such as ICs and sensors.

In the same figure (b), R1 to Rs are resistances, RAI, RA
2 is a relay, Q is a transistor, and DllD.

is a diode for preventing back electromotive force, and LP 1 + LP* is a miniature lamp.

Next, I will explain the works of V and h.

When the main switch 17 is turned on, the transformer 21
The output voltage of Narcissus 1 is rectified and smoothed, and the regulator IC
23 obtains power for control.

When the print SW is turned on, relay RA2 turns on and is self-held by its contact RA2-1.

Also, since the other contact RA2-2 (NO side) is conductive, relay RAI is turned on, and its contacts RAI-1 and RAI
-2 becomes conductive, so that the photoreceptor drive motor 18,
The developing drive motor 19 is operated synchronously.

At the end of the copy, the copy end signal goes to "H" level, turns off the transistor Q, and releases the self-hold of the relay RA2. Relay RA 2 Since it becomes chaotic, relay RAI is also turned off and the motor stops.

In addition, the miniature lamps LPI and LP2 light up during copying.
This is for displaying the P2 and the LPI that lights up during standby, and is generally used to tell whether copying is in progress or not by distinguishing the emitted light color.

Figure 3 (b) shows the timing chart.
As is clear from this timing chart, M, and M,
The operation timings of the two are synchronized.

In the timing of the present invention, since the developing roller is rotated at the same time as the photoreceptor is rotated, the recycled toner is also sufficiently agitated. Furthermore, even if the developing roller is rotated, areas without electrostatic latent images will not be developed because they have no charge.
Therefore, there is no problem even if the developing roller is rotated at the same time as the photoreceptor.

(Effects) The present invention is as described above.According to the present invention, stains due to accumulation of recycled toner are eliminated, and a non-returning image can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the internal structure of a copying machine, which is the premise of the present invention, FIGS. 2(a) and (b) are circuit diagrams showing a motor control system according to an embodiment of the present invention, and FIG. 2A and 2B are timing charts, in which (a) is a timing chart according to a conventional example, and (b) is a timing chart according to the present invention. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 4... Developing section, 12... Cleaning section, 13... Toner collection pipe, 18...
- Photoreceptor drive motor, 19...Development drive motor. Figure 1 Figure 2 (b) Figure 3 r-ino rO-no

Claims (1)

[Claims] It is equipped with a motor that drives the photoconductor and paper conveyance section, and a motor that drives the development section, and also collects toner remaining on the surface of the photoconductor in a cleaning section, and returns the collected toner to the development section. A drive motor control method for a copying machine equipped with a recycling device, characterized in that the drive timings of a motor that drives a photoreceptor and a motor that drives a developing section are synchronized.