JPS6364075A - Copying machine - Google Patents

Abstract

PURPOSE:To eliminate the need of reverse control of a photosensitive body by rotating the photosensitive body so that the contacting point just before separation between a cleaning means and the photosensitive body is advanced at a prescribed angle after the end of copying operation to eliminate black stripes and dirt on a copied image which occur in accordance with separation and contact of the cleaning means. CONSTITUTION:A cleaning means 10 consists of a cleaning blade made of rubber elastomer and attaching metal fittings and has the edge pressed against a photosensitive body 1 to scrape a remaining toner. When the image forming operation is terminated, the cleaning means 10 is moved in the direction of an arrow 12 and the photosensitive body 1 and the cleaning means 10 are separated from each other, but the photosensitive body 1 continues to rotate in the direction of an arrow 2. A part of a swept toner 13 remains on the photosensitive body 1 as a stuck toner 23. When the contacting point between the cleaning means 10 and the photosensitive body 1 is advanced at a prescribed angle theta after the end of image forming operation, the photosensitive body 1 is stopped. If the angle at which the photosensitive body 1 is advanced is so selected that the stuck toner 23 is stopped below the contacting point between the photosensitive body 1 and the cleaning means 10, the photosensitive body is completely cleaned by the cleaning means 10 at the time of starting the next copying and the stuck toner does not remain as dirt on the copy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to copying machines, such as electrostatic transfer copying machines.

Conventional technology The operation of a copying machine will be explained using FIG. In FIG. 2, reference numeral 1 denotes a photoreceptor which rotates in the two directions of arrows. 3 is a developing device, 4 is a transfer charger, 6 is a copy paper, and 6 is a separation charger. The toner image visualized by the developing device 3 is transferred onto the copy paper 6 by the transfer charger 4, and the photoreceptor 1 and the copy paper 5 are separated by the separation charger, and the copy paper 5 is The image is fixed and the copy is completed.

On the other hand, the untransferred toner 8 is cleaned by a cleaning means 10 provided in a cleaning device 9. Reference numeral 14 denotes a static eliminating means that applies uniform light to the photoreceptor 1 to prepare it for the next cycle.

The conventional control will be described with reference to FIG.

In the figure, 1o is a cleaning means, and 13 is cleaned toner.

FIG. 4a shows a state in which the photoreceptor 1 rotates in the direction of the arrow 2 and the toner is cleaned by the action of the cleaning means. The edge of the cleaning means 1o is pressed against the photoreceptor 1 by a spring or weight.

4b is a state in which the cleaning means 10 is moved in the direction of the arrow 12 after the copying operation is completed, and the photoreceptor 1 and the cleaning means 10 are completely separated. At this time, a portion of the cleaned toner 13 remains on the photoreceptor 1.

C in FIG. 4 is a state immediately after the copying operation is finished in the state shown in b in FIG. 4 and the next copying operation is started.

The cleaning means moves in the direction of arrow 15 and comes into contact with photoreceptor 1 . However, the toner remaining on the photoreceptor 1 gets into the space between the cleaning means 10 and the photoreceptor 10, and the copying operation starts without being swept away.

Problems to be Solved by the Invention However, in the above configuration, after the copying operation is completed,
Since the edge of the cleaning means is pressed against the photoreceptor, the surface of the photoreceptor may be scratched or the cleaning means may be deformed.

To completely remove the deformation, the cleaning means can be removed from the photoreceptor after the copying operation is completed, but some of the cleaned toner remains on the photoreceptor, and when the cleaning means is brought into contact with the photoreceptor, it is removed. The remaining toner gets between the cleaning means and the photoreceptor, and the copying operation starts without the cleaning tip being removed. Toner that is not cleaned appears as black lines or stains, especially on the first copy.As a way to solve this problem, the cleaning means is removed once after the copying operation is completed, and then the photoreceptor is removed. It is conceivable to return the motor a little in the opposite direction, but since the reversal is slight, control is difficult and a complicated reversal mechanism such as a clutch is required.

In view of the above-mentioned problems, the present invention provides a copying machine that solves the black streaks and stains on the copied image that occur due to the separation and separation of the cleaning means, and is equipped with control that does not require reverse control of the photoreceptor. It is.

Means for Solving the Problems In order to solve the above problems, a copying machine of the present invention is provided with a photoreceptor, a lower chamber means, a developing means, a transfer means, and a cleaning means. The rotation of the cleaning means is controlled through the child stage, and the cleaning means is controlled to come into contact with and separate from the photoreceptor through the cleaning and separating means, and after the image forming operation is completed, the cleaning means is separated from the photoreceptor by the cleaning and separating means. , Wj The copying operation is completed after the photoreceptor has further rotated so that the contact point immediately before the photoreceptor is separated advances by an angle of 0 (by this, the cleaning means and the photoreceptor are separated from each other). The present invention is provided with a structure that eliminates the accompanying inconvenience in copying images.

According to the present invention, with the above-described configuration, the untransferred toner on the photoreceptor is completely cleaned, and in particular, the cleaning of the first stitch at the start of copying is completely carried out, so that there is no dirt or dirt on the copied image. You will get a copy without black streaks.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of the operation of the present invention, FIG. 2 is a sectional view of essential parts of the copying machine of the present invention, and FIG. 3 is a detailed explanatory diagram of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a photoreceptor which rotates in two directions indicated by arrows. A charger 3 applies an electrostatic charge to the photoreceptor 1. The applied electrostatic charge forms an electrostatic latent image by image exposure, and becomes a visible image by the developing device 3. The image is made of colored fine powder called toner, and is transferred onto copy paper 6 by a transfer charger 4. Reference numeral 6 denotes a paper separation charger which neutralizes static electricity on the copy paper 6 and the photoreceptor 1, and completely separates the photoreceptor 1 and the copy paper 5. The copy paper 5 is conveyed to the fixing device by the conveyance means 7, and a copy is completed. Most of the toner on the photoreceptor 1 is transferred to the copy paper 6, but a portion remains on the photoreceptor 1 as residual toner 8. 9
1 is a cleaning device, which consists of a cleaning means 1o and a toner receiver means 11. The cleaning means 1o consists of a rubber elastic body called a cleaning blade and a mounting bracket. The edge of the cleaning blade is pressed against the photoconductor 1 to scrape off the residual toner 8 from the photoconductor.

Pressing is done with springs or weights, and 8 (//an ~ 30
The strength was adjusted to 9/C7M.

During the cleaning operation, the cleaning means io'f is pressed against the photoreceptor 1, but when the cleaning operation is finished, the cleaning means 10 moves in the direction of arrow 12, and the photoreceptor 1 and the cleaning means 1o are separated. Reference numeral 13 denotes the cleaned toner, most of which is guided into the toner reservoir by the means 11, but some of it adheres to the vicinity of the blade. Reference numeral 14 denotes a static elimination lamp that eliminates static charges on the photoreceptor 1 and prepares it for the next cycle.

FIG. 3 is a detailed explanatory diagram of the present invention, in which 16 is a high voltage power supply, 17 is a cleaning means separation solenoid, and 18 is a solenoid.
19 is a photoreceptor driving means, 2o is an optical system driving means, 21 is a drive control means, and 22 is a central control means.

FIG. 1 is an explanatory diagram of the operation of the present invention. The first section a shows a state where the image forming operation has been completed, and b in FIG. C is the point where the photoreceptor 1 has stopped and the copying operation has ended, and d in FIG. 1 is the point where the next copying operation has started.

The end of the image forming operation means that the high voltage from the central control means 22 (and hence the high voltage 16) stops and the optical system driving means 20
has stopped, the optical system has returned to its origin, and the transfer of the toner image on the photoreceptor 1 onto the copy paper has been completed, and the toner image on the photoreceptor 1 has been removed from the photoreceptor 1 except for the cleaned toner 13 near the cleaning means 1o.
Above: There is virtually no toner left.

On the other hand, the end of the copying operation means the end of the image forming operation, and also the end of the copy paper 6 being ejected from the copying machine.1. Although the photoreceptor driving means 19 is in a stopped state, if the copy start button is pressed, the next copying operation is immediately started.

The state in which the image forming operation has been completed is shown in FIG.

When the image forming operation is completed, according to instructions from the central control means 22,
The solenoid driving means 18 operates, and the cleaning means separation solenoid 17 operates to move the cleaning means 1° in the direction of the arrow 12. At this time, the central control means 22 continues to operate one photoreceptor driving means through the entire drive control means 21, and the photoreceptor 1 continues to rotate in the direction of the arrow 2. A portion of the cleaned toner 13 remains on the photoreceptor 1 as toner 23 that adheres to the photoreceptor 1 . This is illustrated in Figure 1b.

As shown in C of FIG. 1, the cleaning means 1 at the end of the image forming operation
The photoreceptor driving means 19 is stopped when the contact point between the photoreceptor 1 and the photoreceptor 1 reaches an angle of θ as viewed from the contact point at the end of the image forming operation. In this example, θ was set to 340°. Since the diameter of the photoreceptor 1 in this embodiment is 60'2 and the circumferential speed is 100''/S, the erasing means separation solenoid 1
The central control means 22 controls the photoreceptor and the driving means 19 to stop after 1.78 seconds from the time when the photoreceptor and the driving means 19 are activated.

Generally, the diameter of the photoreceptor is R″ran2 peripheral speed 1−
If vM73, Rπ0/36 after the image forming operation is completed.
The copying operation may be ended after 0 VS.

d in FIG. 1 shows a state in which the next copy is started after the copy operation is completed. When the copy start button is fully pressed, the cleaning means 1o moves in the direction of arrow 15.

At the same time, the photoreceptor 1 begins to rotate in the direction of the arrow 2.

At this time, there is attached toner 23 on the downstream side of the contact point between the photoreceptor 1 and the cleaning means 1o. Therefore, the adhered toner 23 can be completely cleaned off by the cleaning means 1Q and will not become a stain on the copy.

In this embodiment, the advancing angle 0 of the photoreceptor 1 is set to 340 degrees, but the angle may be selected so that the adhered toner 23 remains downstream of the contact point between the photoreceptor 1 and the cleaning means 10 when the next copy starts. .

Effects of the Invention As explained above (after the image forming operation is completed, the photoreceptor is further advanced by 0 and the copying operation is completed, so that when the next copy is made, black lines and stains will occur on the copy. The effect of the present invention is great because it allows you to make clean copies without any problems.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of the present invention, FIG. 2 is a sectional view of essential parts of a copying machine of the present invention, FIG. 3 is a detailed explanatory diagram of the present invention, and FIG. 4 is an explanatory diagram of a conventional example. 1...Photoreceptor, 2...Rotation direction, 4.
...Transfer charger, 8...Residual toner, 9.
... Cleaning device, 10 ... Cleaning means, 12 ... Direction of separation, 13 ... Cleaned toner, 16 ... Direction of contact, 17・・・
... Cleaning means separation solenoid, 19 ... Photoreceptor drive means, 20 ... Optical system drive means, 21.
... Drive control means, 22 ... Central control means, 23 ... Adhesive toner. Name of agent: Patent attorney Toshi Nakao and 1 other person E-ni\=+r- 2---3 S awards 1---8 people 1 To 2---Q turn <Jun

Claims (3)

[Claims] (1) A photoreceptor whose rotation is controlled by a photoreceptor driving means;
a cleaning means whose contact and separation with the photoreceptor is controlled by a cleaning contact and separation means, and after the image forming operation is completed, the cleaning means is separated from the photoreceptor by the cleaning and separation means, and the cleaning means and the photoreceptor are separated. A copying machine characterized in that the copying operation is completed after the photoconductor further rotates so that the contact point immediately before the photoconductor separates advances by a predetermined angle. (2) The copying machine according to claim 1, wherein the predetermined angle is between 300° and 350°. (3) A photoreceptor, a charging means, a developing means, a transfer means, a cleaning means, a photoreceptor whose rotation is controlled by a photoreceptor driving means, and a cleaning means whose contact and separation with the photoreceptor is controlled by a cleaning and separation means. , the diameter of the photoreceptor is Rmm, the peripheral speed of the photoreceptor is Vmm/sec, and after the image forming operation is completed,
The cleaning means is separated from the photoreceptor by the cleaning/separating means, and the angle at which the photoreceptor has advanced from the point of contact immediately before the cleaning means and the photoreceptor are separated is θ, and πRθ/ from the end of the image forming operation. A copying machine characterized in that the rotation of the photoreceptor is stopped after 360·V (sec).