JPH0321971A - Image forming mechanism - Google Patents

Abstract

PURPOSE:To facilitate separation of a transfer paper from a photosensitive body and to simplify carriage by providing a carrying electrifier between a carrying device and a separating electrifier so that the transfer paper is carried through the use of attraction from potential difference between the transfer paper and the carrying device. CONSTITUTION:The mechanism is provided with a transfer electrifier 3 which gives a potential of polarily opposite from a developer on the photosensitive body to the transfer paper 2, the separating electrifier 4 which separates the transfer paper 2 after transfer from the photosensitive body 1, and the carrying device 6 which carries the transfer paper 2 after the transfer to a fixing device 5 to fix the developer on the transfer paper 2. The carrying electrifier 7 which carries the transfer paper 2 by using the attraction caused by the potential difference between the paper and the carrying device 6 is provided between the carrying device 6 and the separating electrifier 4. Thus the separation of the transfer paper 2 from the photosensitive body 1 is facilitated, the carriage by the carrying device 6 is simplified and the carrying device of this type is miniaturized, compared with an air-carrying type.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to the image forming structure of a copying board and a laser printer, and particularly improves the conveyance of transfer paper. In the image forming system, a suction 7 is used to convey the transfer paper transferred by the photoreceptor to the fixing device, and by generating negative pressure, the transfer paper and the conveyor belt are attracted. Conveyance is being carried out (air conveyance).

There is also a method of conveying the void portion of the transfer paper using a roller or the like.

<Problems to be Solved by the Invention> In the above conventional technology, in the case of pneumatic conveyance, a device (for example, a fan) that generates negative pressure and a duct etc. to guide this negative pressure to the back side of the belt are required, which reduces the cost. As the height increases, space is required to install fans and ducts.

Further, the roller conveyance method has many limitations, such as requiring voids in the transfer paper and using a one-sided standard.

In view of the above, it is an object of the present invention to provide an inexpensive and space-saving image type boiso structure that does not require a special negative pressure generator, duct, or the like.

<Means for Solving the Problem> As shown in FIG. 1.2, the means for solving the problem according to the present invention is as shown in FIG. 1, and a conveying device 6 for conveying the transferred transfer paper 2 to a fixing device 5 for fixing the developer on the transfer paper 2. A transport charger 7 is provided between the charger 4 and the transport charger 4 for transporting the transfer paper 2 by utilizing the attraction force due to the potential difference with the transport device 6.

<Function> In the above means for solving the problem, a developer (toner) having a polarity opposite to the surface potential of the photoreceptor 1 is attached by the developing device to the surface of the photoreceptor 1 on which the electrostatic latent image is formed, and the developer (toner) is Imaged.

The transferred transfer paper 2 is then charged with a charge having a polarity opposite to that of the developer by the transfer charger 3, and the developer on the photoreceptor 1 is attracted and transferred to the transfer paper 2.

At this time, since a weak potential remains on the photoreceptor 1 other than the developing area, the transfer paper 2 attempts to move toward the cleaning device while adhering to the photoreceptor 1.

Therefore, the charger 4 for peeling applies a voltage as shown in FIG. 3 to neutralize the transfer paper 2, prevents the transfer paper 2 from adhering to the photoreceptor 1, and causes the transfer paper 2 to be peeled off from the photoreceptor 1.

Next, 1) the transfer paper 2 is charged again by the transport charger 7 provided after the peeling charger 4; Then, since the conveyance belt 26 of the conveyance device 6 is an insulator, the transfer paper 2 is attracted to the conveyance belt 26 due to the potential difference between the transfer paper 2 and the conveyance belt 26, and the transfer paper 2 is transferred to the fixing device 5. It can be transported.

As described above, since the conveyance charger 7 is provided after the peeling charger 4, it is easy to peel off the transfer paper 2 from the photoreceptor 1, and the conveyance by the conveyance device 6 is easier than in the pneumatic conveyance type. It also becomes possible to downsize the device.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a structural diagram of a copying machine as an image type T-iso structure according to the present invention, Fig. 2 is an electric circuit diagram of its transfer section, Fig. 3 is a voltage waveform diagram of a peeling charger, and Fig. 4 is a voltage waveform diagram of the transport charger.

As shown in the figure, the image type R&A structure according to the present invention includes a photoreceptor 1
A transfer charger 3 is arranged around the transfer paper 2 to give the transfer paper 2 a potential of opposite polarity to the developer (toner) on the photoconductor 1, and a transfer charger 3 is arranged around the photoconductor 1 to move the transfer paper 2 away from the photoconductor 1. a peeling charger 4 for applying a potential of opposite polarity to the transfer charger 3;
A fixing device 5 for fixing the developer on the transfer paper 2 is provided with a conveyance device 6 for conveying the transferred transfer paper 2, and the transfer paper 2 is provided between the conveyance device 6 and the peeling charger 4. A transport charger 7 is provided for applying a potential of the same polarity as the transfer charger 3 to the transfer charger 3 and transporting the transfer paper 2 by utilizing the adsorption force due to the potential difference with the transport device 6.

The photoreceptor 1 is drum-shaped, and a charge is generated on the surface by a charger 8 around the photoreceptor 1, and a highly charged electrostatic latent image is formed by exposure from an exposure device (not shown). is what is being shaped.

A developing device 9 containing a developer charged with a polarity opposite to that of the electrostatic latent image is disposed on the front side of the photoreceptor 1 in the rotational direction of the charger 8 .

Furthermore, a transfer paper peeling claw 10 may be arranged around the photoreceptor 1 in front of the transfer charger 3.

The transfer charger 3 is arranged on the front side in the rotational direction of the photoreceptor 1 than the developing device 9, and a paper feed roller 11. , 12, and is separated from the case 14 and the charging wire 15 disposed in the front and back direction thereof.

The peeling charger 4 is disposed adjacent to the transfer charger 3 on the fixing device 5 side, and has the same structure as the transfer charger 3.

The conveying charger 7 is disposed adjacent to the peeling charger 4 (1) and has the same structure as the peeling charger 4 and the fixing device 5.

As shown in FIG. 2, alternating current (AC) is applied to the transfer charger 3, peeling charger 34, and conveyance charger 7 from an AC power source 17 via a high voltage transformer (not shown). Direct current power is applied to the transfer charger 3 and the transport charger 7 from a first power source 18 such as a battery. Further, the stripping charger 4 is connected to a second power source that applies a direct current (DC) having a polarity opposite to that of the first power source 18 .

The fixing device 5 includes a pair of fixing rollers 2 as shown in FIG.
1 and 22, and a case 23 that covers them.

The conveyance device 6 includes a pair of conveyance rollers 24, 25, and a conveyance belt 26 wound around both rollers 24, 25.
Therefore, an insulator that moves as shown by the arrow in the figure or something very similar to an insulator is used.

In FIG. 1, 28 is a guide plate that guides the transfer paper 2 from the paper feed rollers 11 and 12 to the baby body 1, and 29 is a guide plate that guides the transfer paper 2 from the conveying device 6 to the fixing device 5.

In the above structure, a developer (toner) having a polarity opposite to the surface potential of the photoreceptor 1 is attached by the developing device to the surface of the photoreceptor 1 on which the electrostatic latent image has been formed by the exposure device, and the developing agent is be converted into Then, the transfer paper 2 fed by the paper feed rollers 11 and 2 is charged with an electric charge of opposite polarity to the developer by the transfer Teidenki 3, and the developer on the photoreceptor 1 is attracted and transferred to the transfer paper 2. let

At this time, since a weak potential remains on the photoreceptor 1 other than the developing area, the transfer paper 2 attempts to move toward the cleaning device while adhering to the photoreceptor 1.

Therefore, the peeling charger 4 applies a voltage as shown in FIG. 3 to neutralize the transfer paper 2, prevents the transfer paper 2 from adhering to the photoreceptor 1, and causes the transfer paper 2 to be peeled off from the photoreceptor 1.

The steps up to this point are completely the same as the conventional ones.

Next, the transfer paper 2 is charged again by the conveying charger 7 provided after the peeling charger 4. Then, the transport device 6
Since the conveyance belt 26 is an insulator, the transfer paper 2 is attracted to the conveyance belt 26 due to the potential difference between the transfer paper 2 and the conveyance belt 2G, and the transfer paper 2 can be conveyed to the fixing device 5.

As shown in FIG. 4, it is considered suitable for the voltage to be applied to the transport charger 7 to have the same polarity (DC) as that of the transfer charger 3. Further, it is considered suitable that the amount of charge is the same as that during transfer. This can be seen from the fact that when the peeling charger 4 is not used and forcible peeling is performed using the peeling claw 10 or the like, the transfer paper 2 is sufficiently conveyed by the attraction force due to the potential difference between the transfer sheet 2 and the conveyance belt 26.

Further, a dedicated high-voltage transformer may be provided for the output to the transport charger 7, but as shown in FIG. 2, if it is shared with the transfer charger 3, the size can be reduced.

In this way, since the conveyance charger 7 is provided after the peeling charger 4, it is easy to peel off the transfer paper 2 from the photoreceptor 1, and the conveyance by the conveyance device 6 is also easier compared to the pneumatic conveyance type. Moreover, miniaturization is also possible.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects of the Invention> As is clear from the above description, according to the present invention, a conveyance system is provided between the conveyance device and the peeling charger for conveying the transfer paper using the attraction force due to the potential difference between the conveyance device and the conveyance device. Since the transfer paper is equipped with a charger, it is easy to peel off the transfer paper from the photoreceptor, and transport by the transport device is easier and more compact than the pneumatic transport method, which is an excellent effect. .

[Brief explanation of the drawing]

Fig. 1 is a diagram of the structure of a copying machine as an image forming system according to the present invention, Fig. 2 is an electric circuit diagram of its transfer section, Fig. 3 is a voltage waveform diagram of a peeling charger, and Fig. 4 is a voltage waveform diagram of the transport charger. 1: Photoreceptor 2: Transfer paper 3: Transfer plate 1? Electric appliances 4:
Charging for peeling 5: Fixing device 6: Conveyance device 7: Charger for conveyance.

Claims (1)

[Claims] A transfer charger placed around the photoconductor, a peeling charger to separate the transfer paper from the photoconductor after transfer, and a fixing device to fix the developer on the transfer paper after transfer. A conveyance device for conveying the paper, and a conveyance charger for conveying the transfer paper using an adsorption force due to a potential difference with the conveyance device is provided between the conveyance device and the peeling charger. An image forming mechanism characterized by: