JPS58108567A - Recording device - Google Patents

Abstract

PURPOSE:To improve transcript efficiency to normal paper, stabilize the transcript, reduce the running cost of the titled device and enable the device to transcribe to various kinds of paper by transcribling pictures by a conductive roll in an output recording device to be used for a facsimile or the like. CONSTITUTION:Transcript voltage VR corresponds to the pottential difference between negative corona charge and a cylinder. A switch S is closed during the period corresponding to transcript time. At the moment of closing the switch S, Cs and Cp are charged. Subsequently leak charge g' flows from a resistor RP and the quantity of charge is increased at time constant RP(Cs+Cp). If the switch S is opened during the period the charge g' is low, toner charge (g) is transferred to the CP of recording paper to transcribe. Therefore if the transcript time is fixed sufficiently shorter than time constant RP, the transcript is made possible even when normal paper is used. Since the contact between the a conductive roll 17 obtained by this invention and a cylinder 9 is geometrically a line, the transcript time is shortened. In order to improve transcript efficiency to the normal paper, it is also permitted to make any one of the cylinder 9 and a conductive roll or both of them of conductive elastic rubber.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a recording device for rounding the output of image signals used in facsimiles, etc., in which a recording electrode and a magnetic toner developing machine are connected via a 4IK insulating brass body. The present invention relates to a recording apparatus that forms a toner image on an insulating recording medium and transfers it onto a recording paper at the same time as a 9-pixel signal is applied.

(g) Background of the technology As an image recording device, one that transfers a toner image formed on the surface of a recording medium onto recording paper is known.
The back surface of the recording paper is charged, and the electrostatic force of the charged charges attracts and adheres the charged toner that forms the toner image to the surface of the recording paper.

In this case, the dissipation of electrical charges on the back side of the recording paper is prevented.

It has been desired to be able to obtain clear reproduced images.

(Q. Prior Art and Problems) Figure 1 shows the configuration of the printing section of a conventional recording device.The recording electrode 1 is a multi-stylus electrode in which electrode needles 2 consisting of counting groups are arranged in a row. It is.

Jin's recording electrode 1. 3. An insulating recording body made of a dielectric film. contact. Meanwhile fixed cylindrical sleeve 4.
0 internally rotating magnetic row 25. 6. Magnetic toner developing machine with 3. Insulating recording material. Recording electrode 1. Install it in a position facing the Furthermore, on the cylindrical sleeve 4.0 there is a counter electrode 7.0 divided into a plurality of segments. Place them close together. The means for recording is a cylindrical sleeve4. Transfer the magnetic toner to the external station of the recording electrode needle 2. A voltage is applied corresponding to the image signal to the counter electrode 7. Recording electrode needle 2. By selectively applying a voltage with the opposite polarity to the voltage applied to the insulating recording medium 3., the magnetic toner selected in 9 and carried onto the 9 segments is charged, thereby charging the insulating recording medium 3. This is a method of attaching magnetic toner to a toner image to form a toner image.

In order to reduce the recording voltage, the magnetic toner used in this apparatus is a conductive magnetic toner having a resistance value of 10'' to 109 Ω-CIL (measuring electric field of 3 KV/mψ).

FIG. 2 shows the configuration of the recording apparatus, and the recording process will be explained using this figure. The insulating recording body 3° is made of a dielectric film in the form of a belt and rotated at a constant speed by a cylinder 8.9°lO. Insulating recording material in the form of a belt 3. Recording electrode 1. Place the tips of the two in contact with each other. In addition, the above-mentioned nine counter electrodes 7. The cylindrical sleeve 4.0
6. Magnetic toner developer on the surface. Recording electrode 1. Place it opposite.

Insulating recording material 3. After forming the toner image thereon, the insulating recording medium 3. Rotate.

Grounded friend cylinder 9. Recording paper 12. 3. Insulating recording material. Corotron 1 is transferred from the back side.
3. Transfer the toner image to the recording paper 12. Transfer to.

After this, recording paper 12. The upper transferred image is transferred to recording paper 12. by a pressure fixing device 14. to be fixed to. On the other hand, the insulating recording body 3. Rotate further and attach the corona static eliminator 16 at the 8° part of the grounded cylinder. By performing corona charge removal, an insulating recording material 3. 3. Erase the charge of the good magnetic toner remaining on the insulating recording material. Weakens the adhesion to. Furthermore, an insulating recording body 3. When the toner is rotated and conveyed to the printing section, the remaining good magnetic toner is transferred to the magnetic roller 5 of the magnetic toner developing device 6. It is collected by the magnetic force of By repeating the above recording process, it is possible to continuously obtain image output on the recording paper.

Since this recording device can simultaneously perform the step of forming a submerged layer using the recording electrode and the developing step using the developing device, the device has a simple configuration, is small in size, and is inexpensive.

In addition, since magnetic toner is used and untransferred toner can be collected in the developing machine and reused without cleaning, the apparatus is easy to maintain and the cost of consumables is low.

Now, in the transfer section of the conventional direct recording apparatus, as described above, the transfer corotron 13. The corona electric field applied to the recording paper 12. The transcription was being carried out. In this case, when high-resistance treated paper coated with an insulating resin on the surface was used as the recording paper, a transferred image could be obtained with a transfer efficiency of about 9 (H!), but when plain paper was used, the transfer efficiency was is 40-
In this case, it was difficult to transfer onto plain paper in practice because the transfer unevenness was noticeable.

OBJECTS OF THE INVENTION An object of the present invention is to improve the transfer efficiency when transferring a toner image on an insulating recording medium to ordinary recording paper.

Further, it is an object of the present invention to provide a recording device that can obtain a uniform transferred image over the entire surface of recording paper.

■ Structure of the invention In the present invention, this object is achieved by using an insulating recording medium,
A recording electrode and a magnetic brush developing device are arranged opposite to each other, a counter electrode is arranged at a position opposite to the print recording electrode on the magnetic roller sleeve of the magnetic brush developing device, and a voltage is selectively applied between the scissors recording electrode and the counter electrode. By applying , the magnetic toner transferred onto the counter electrode is made to adhere to the insulating recording body, thereby forming a toner image.

In a recording device in which the toner image is transferred to an electric field-transferred recording paper in a transfer section, the transfer section forms the toner image and transfers the recording paper to both sides of an insulating recording body formed by stacking recording papers on a round surface. This is achieved by providing a brass device characterized in that it comprises at least one pair of electrically conductive rollers that press against the electrically conductive rows 2 and means for applying a bias voltage between the electrically conductive rows 2 on either side of the 9.

[F] Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

Before explaining the embodiments, the basic idea of the present invention will be explained.

The present inventor investigated the reason why the transfer efficiency to plain paper is inferior to that of high-resistance treated paper in such a direct recording device. This result will be explained using FIG. 3.

FIG. 3(2), @ is an enlarged view of the transfer section. Insulating recording material that formed the toner bond 3. cylinder 9, which is grounded;
When the paper is sent to 12. Transfer corotron from the back side via 13. Corona discharge is performed by

Recording paper 12 with this ζ. The configuration of the capacitance c is shown in the figure.
It can be represented by a dielectric material of p and a conductor of resistance Rp arranged in parallel. The measurement results are Cp = 40 to 6 for high resistance treated paper.
0ψF, Rp=10'1~101SΩ- scratches, plain paper Cp=2o~30pF, Rp=10''~1011Ω-
It was 1. On the third side, recording paper 12. When high-resistance treated paper is used, magnetic toner with a positive charge cannot be recorded.
By a negative corona charge irradiated on the back side of the paper 12.0.

Recording paper 12. Transfer is performed by being attracted to. Compared to this, recording paper 12. The third case shows the case of binding and using plain paper.
This will be explained using Figure ■.

Since the plain paper 12' has a low resistance value Rp, the negative corona charge passes through the paper and reaches the front side within the transfer time as shown in the figure.

As a result, the positive charge and negative charge that the conductive magnetic toner has are neutralized, and the magnetic toner no longer has any charge.

This rounding loses the ability to attract magnetic toner toward the recording paper, resulting in poor transfer efficiency. In corona transfer, it is difficult to uniformize the amount of charge held by the corona charge, and there is a lot of variation, so there is a difference in the amount of negative charge that is transferred to the back side of the recording paper, resulting in transference. It seems to be. As described above, it has been found that the amount of charge passing through the paper is a problem in plain paper transfer.

FIG. 4 is a diagram showing the main part of an embodiment of the present invention.

Assign the same symbols to parts equivalent to those in Figure 3.

In FIG. 4, 17. 2 is a conductive row 2 used in place of the transfer corotron, and is pressed against the back side of the recording paper 12° with a constant force to perform the transfer in good condition. Conductive roller 17. and cylinder 9. This is a line contact, not a surface contact as in the conventional device described above.

FIG. 5 is an equivalent circuit diagram explaining development.

In the figure, Cs ld is the capacitance of the insulating recorder, Rp,
Cp.

is recording paper 12. Indicates the resistance and capacitance of g indicates the amount of charge of the magnetic toner. The transfer voltage Vm corresponds to the potential difference between the negative corona charge and the nine cylinders connected to ground. Open/close switch S
is recording paper 12. and insulating recording material 3. The contact time corresponds to the transfer time. period.

Closed. Now, in this equivalent circuit, the moment the switch 8 is closed, Cs and Cp are charged with charges corresponding to the partial voltage. Next, leakage charge g' flows through resistor Rp.

This charge g' increases with a time constant Rp (Cs+Cp).

Therefore, if the switch S is opened before the leakage load g' becomes large, the toner charge g is transferred to the recording paper Cp,
Transcription will be performed.

That is, if the transfer time is set sufficiently shorter than the time constant Rp (Cs+Ctl), the recording paper 12. It is also possible to transfer images using bound plain paper. In the case of high-resistance treated paper, the time constant is 1a-%-108, but for plain paper, the time constant is very short at 10m8 to 100m8.With this nine-point corona transfer, the transfer time is too long, making it difficult to transfer to plain paper. becomes.

As described above, this conductive row 217. The contact point between the cylinder and the cylinder 9° is geometrically a line, so it was explained in FIG. This has the effect of greatly shortening the transfer time. This rounding, conductive roller 17. contact time.

The time constant (Cs+
0p) When the surface is shorter than Rp, the magnetic toner is transferred to the recording paper 12.0 before the negative charge reaches the surface of the recording paper. transfer can be performed by being attracted to. In addition, the conductive roller 17
．． and cylinder 9. Since the transfer voltage applied to the recording paper 12 is constant, the amount of negative charge generated on the surface of the conductive roller is also uniform, eliminating uneven transfer unlike in the case of a transfer corotron. A uniform transfer can be made to the plain paper used as a paper.

In the present invention, the following proposals are made to improve transfer performance to plain paper. In order to increase the transfer efficiency, the shorter the transfer time, the better. For this method, a conductive roller 17. and recording paper 12. 9, and a conductive row to reduce the contact area of the
F17° should be made of a hard material such as metal. However, in this case cylinder 9. and conductive roller 17. If the straightness of the sheet is not good, transfer gaps will occur.

In order to prevent transfer omission, K is cylinder 9. and conductive roller 7. There is a method of making one or both of 9 from conductive elastic rubber.

Examples of the present invention include conductive rubber acids [44°.

58°, 85° conductive rows 217. Create cylinder 9. It is best to transfer using a metal rower 2 and pressing with a pressure of about 1.4. As a result, when it comes to uniformity in the width direction of the recording paper, even though the rubber hardness is low, it suffers from erosion.

In terms of transfer efficiency, the higher the rubber hardness, the better.

Rubber acid [At 85 degrees, a transfer efficiency of 75 degrees or higher was obtained on plain paper.゛0 As described in detail, according to the present invention, the transfer efficiency to plain paper is increased and stable transfer is achieved by performing transfer using conductive O-9 in the transfer section of the direct recording device. Since this can be realized, the running cost of the apparatus can be lowered, and it is possible to transfer onto various types of paper.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a printing section of a recording device. Figure 2 is. FIG. 2 is a configuration diagram of a recording device. Figure 3 is a diagram explaining the principle of transfer by corona transfer, the same plane is an explanatory diagram when high resistance treated paper is used, the same figure (c) is an explanatory diagram when plain paper is used, and Figure 4 Figure 9 is a configuration diagram of a transfer section when a conductive roller is used according to the present invention, and Figure 5 is a diagram explaining the principle of transfer. 3: Insulating recording body, 9: Conductive roller, 12: Recording paper 1
7: Conductive roller. □ Porridge 2nd item-S ``helmet 4
FigurevEj5Figure

Claims (1)

[Scope of Claims] (l) A recording electrode and a magnetic brush developing device are arranged to face each other with an insulating recording body interposed therebetween, and a counter electrode is installed at a position opposite to the recording electrode on a magnetic roller sleeve of the magnetic brush developing device. Then, by selectively applying a voltage between the recording electrode and the counter electrode, the magnetic toner transferred onto the counter electrode is adhered to the wrinkled insulating recording body to form a toner image.
In a recording device in which a toner image formed on the insulating recording material is transferred to a recording paper using an electric field in a transfer section, the transfer section includes:
Pressing an insulating recording body formed by overlapping a recording paper on the surface on which the toner image is formed and the recording paper from both sides.
A recording apparatus comprising a pair of conductive rollers and means for applying a bias voltage to the conductive rollers on both sides. (2) At least one of the conductive rollers has elasticity so that (1) pressure is uniformly distributed in the area where the insulating recording medium and the recording paper come into contact. A direct memorization device according to claim (1).