JPS5919967A - direct recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a recording device for outputting image signals used in facsimiles and the like, and particularly relates to a recording device for outputting image signals used in facsimile machines, etc. This invention relates to a direct recording device that forms a toner image on an insulating recording medium and transfers it onto a recording paper at the same time as an image is applied.

(B) Background of the Technology First, the configuration of the printing section of the direct recording device and the outline of the entire printing process will be explained.

FIG. 1 shows the configuration of the printing section, and the recording electrode 1 is a multi-stylus electrode in which recording electrode needles 2 consisting of a plurality of groups are arranged in a line.

An insulating recording body 3 made of a dielectric film is brought into contact with this recording electrode 1. On the other hand, a magnetic toner developing machine 6 having a rotating magnetic roller 5 is placed inside a fixed cylindrical sleeve 4 to bring the insulating recording body 3 into contact with the recording electrode 1. It is installed at a position opposite to the pole 1 on the recording ' through the recording medium. Further, on the cylindrical sleeve 4, a counter electrode 7 divided into a plurality of segments is arranged in close contact with each other.

The means for recording is to transfer magnetic toner to the outer periphery of the cylindrical sleeve 4, apply a voltage to the recording electrode needle 2 in accordance with the image signal, and apply a voltage to the counter electrode 7 of opposite polarity to the voltage applied to the recording electrode needle 2. In this method, the magnetic toner carried onto the selected segment is charged by selectively applying a voltage, thereby causing the magnetic toner to adhere to the insulating recording medium 3 and forming a toner image.

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 ME film in the form of a belt and rotated at a speed of one foot by a cylinder 8.9.10. The tip of the recording polarization 1 is placed in contact with the inside of this belt-shaped insulating recording body 3. Further, a magnetic toner developing device 6 having the above-mentioned opposing surface and pole 7 on the surface of the cylindrical sleeve 4 is installed facing the recording electrode 1.

After forming a toner image on the insulating recording body 3 by the means explained in FIG. The toner image is transferred onto the recording paper 12 using the transfer roller 13 from the back side. Thereafter, the transferred image on the recording paper 12 is fixed to the recording paper 12 by a pressure fixing device 14. On the other hand, the insulating recording body 3 is further rotated, and the corona charge is removed by the corona charge remover 16 at the grounded portion of the cylinder 8, thereby erasing the charge of the magnetic toner remaining on the insulating recording body 3. Weakens the adhesion to body 3.

When the insulating recording medium 3 is further rotated and conveyed to the printing section, the remaining magnetic toner is collected by the magnetic force of the magnetic roller 5 of the magnetic toner developing device 6.

By repeating the above recording process, it is possible to continuously obtain image output on the recording paper.

The feature of this direct recording device is that the latent image forming process using the recording electrode and the developing process using the developing machine can be performed simultaneously, so the device configuration is simple, and the device is small and inexpensive. In addition, since magnetic toner is used and residual toner that is not transferred can be collected in the developing machine and reused without cleaning, maintenance is easy and the price of consumables is low.

(C) Prior Art and Problems Now, as for the structure of the counter electrode provided on the cylindrical sleeve 4 of the printing section of the present direct recording device, the cylindrical sleeve 4 is conventionally fixed as shown in FIG. Using a magnetic toner developing device 6 capable of large rotations around its axis, opposing 'IJL poles 7 formed of flexible printed boards are bonded to the surface of the cylindrical sleeve 4. Counter electrode 7
It is made up of a segment part 21 and a lead part 22 by etching a copper-clad flexible printed board. For this reason, the conventional magnetic toner developing device 6 has the characteristic that it is easy to maintain the developing distance provided between it and the recording electrode 1, and is relatively simple in structure, resulting in low cost. In the configuration, the recording electrode needle 2 and the
L that shortens the pulse width of the signal awakening pressure applied to pole 7.
It has been found that when one image is output, stripes occur due to the density of the print perpendicular to the feeding direction of the insulating recording medium 3. Hereinafter, this phenomenon will be referred to as development stripes.

When these iron stripes occur, they appear as missing bits in horizontal line segments in image output by facsimiles, etc., resulting in images with many defects.

Conventionally, as a method of erasing these development stripes, the recording electrode needle 2
This was compensated for by increasing the recording voltage applied to the counter electrode 7 or by extending the recording pulse width. However, if the recording voltage is set too high, the load on the driver becomes too large, and if recording electrodes with higher resolution are used, radiation occurs between the adjacent ONi electrode needles and OFF' electrode needles, resulting in image Therefore, it was difficult to record at high speed in the present 1α contact recording device.

(D) An object of the present invention is to provide high-speed 8-bit recording in such a direct recording device.
The present invention aims to provide a direct recording device that can obtain stable images without streaks even if the width of the recording pulse is shortened in order to reduce the noise level.

(E) According to the present invention, a hollow cylinder made of a non-magnetic material is rotatably arranged outside a permanent magnet having a plurality of magnetic poles on its circumference, and a magnetic roller arranged such that one magnetic pole of a permanent magnet faces a recording electrode via an insulating recording body; a plurality of ring-shaped storm poles provided on the hollow cylinder and surrounding the outer periphery of the hollow cylinder; A counter electrode consisting of

provided facing a part of the outer periphery of the ring-shaped electrode,
This is achieved by providing a direct recording device having the feature #j of having a plurality of lead electrodes for obtaining electrical continuity.

(F) Embodiments of the Invention Embodiments of the present invention will be described in detail below with reference to the drawings.

As a result of a detailed investigation by the present inventors into the cause of the above-mentioned development stripes, the following phenomenon became clear. As shown in FIG. 1, in a magnetic toner developing machine used in a direct recording device, as the magnetic roller 5 rotates, the magnetic toner 18 is conveyed in a chain shape while rotating over the cylindrical sleeve 4. The condition of the chain is that immediately above the magnetic pole of the magnetic roller 5, the magnetic force (therefore, it stands perpendicular to the circumference of the cylindrical sleeve 4).In addition, between the magnetic poles N and S, there is a magnetic force in both directions of N and S. Due to the magnetic force, the chain is conveyed in a lying state on the cylindrical sleeve 4. Therefore, the magnetic roller 5 rotates, and the magnetic roller 2 is attached to a part of the recording electrode needle 2.
When the magnetic pole No. 5 comes, the toner chain is in a truncated state directly below the recording electrode needle 2, as shown in FIG. Next, when the middle of the magnetic poles of the magnetic roller 5 comes to the detail of the recording electrode needle 2, the toner chain lies in a lying position 4 directly under the recording electrode needle 2, as shown in FIG. Therefore, during recording, the state shown in FIG. 1 and the state shown in FIG. 4 occur alternately and repeatedly.

When a recording pulse is applied between the recording electrode hook 2 and the counter electrode 7 with the toner chain standing as shown in FIG.
Since the toner chain is subjected to a large force in the longitudinal direction by the magnetic poles, the adhesion between the toner particles is strong, the conductivity between the toner particles is improved, and the print density is increased. Compared to this, the fourth
When a recording pulse is applied with the toner chain lying down as shown in the figure, the adhesion between the toner particles is weak and there are many gaps between the toner layers, so the conductivity between the toners is poor and charge injection is difficult to occur. It was found that the print density became lighter.

From the above investigation results, in order to obtain high-speed recording without developing stripes, it is necessary to perform printing with the toner chain always standing.

Specific examples of the present invention will be described below.

Figure 5 is a perspective view of the printing section of the direct recording device according to the embodiment. An insulating recording body 3 made of a dielectric film is brought into contact with the recording electrode 1, and a magnetic roller 5 is placed facing the recording electrode 1.
An arbitrary magnetic pole of the cylindrical sleeve 4 is fixed, and the cylindrical sleeve 4 can be rotated.

Further, the configuration of the opposing 'α pole 7 is such that the cylindrical sleeve 4 is an insulator, or an insulating layer 24 is formed on a metal sleeve, and the cylindrical sleeve 4 is surrounded on the surface of the insulating layer 24. Hiroshi@23 will be established. As a specific method for forming the ring-shaped electrode 23, a shrink tube made of a polymeric material is placed on the metal cylindrical sleeve 4 made of aluminum or stainless steel to form the insulating layer 24. There is a method of forming a ring-shaped electrode thereon by electroless partial plating, vapor deposition, or coating with a conductive paste. Alternatively, an electrode butter 7 made of a flexible printed board may be pasted onto the cylindrical sleeve 4.

Next, top 1rj! Regarding the method of establishing conduction for the ring-shaped electrodes 23, a plurality of lead electrodes 25 are provided at the same pitch, facing each ring-shaped electrode 23, on a part of the circumference of the cylindrical sleeve 4. In this method of contacting the lead electrode 25 and the ring-shaped electrode 23, the lead electrode 25 is made of metal in the shape of a plate spring, and is brought into contact with the ring-shaped electrode 23 using the elasticity of the spring to obtain electrical continuity.

By selectively applying voltage to the terminals of the recording electrode 1 and the lead electrode 25 using the magnetic toner developing device 6,
Since the corresponding ring-shaped electrode 23 is selected, matrix recording is possible even when the cylindrical sleeve 4 is rotating.

Further, since the magnetic pole of the magnetic roller 5 is fixed facing the recording electrode needle 2, the toner chain is always maintained in an upright state directly under the recording electrode needle 2, so that an image without a developing device can be obtained.

Next, another embodiment of the present invention will be described.

In the embodiment of the present invention, as a contact method between the lead electrode 25 and the ring-shaped 'itft M23, the lead 'φ and the pole 25 are made of a plate spring-like metal, and the elasticity of the ring-shaped electric hood 23 and the spring is utilized. Contact is being made. However, in this case, in order to keep the potential applied to each ring-shaped electrode 23 constant, it is necessary to make the elasticity of the spring considerably strong at each contact portion. Therefore, due to the friction between the lead electrode 25 and the ring-shaped electrode 23, the ring-shaped electrode 23 will wear out during long-term use. In addition, the magnetic toner conveyed onto the magnetic roller sleeve is transferred to the lead electrode 2.
5 and the ring-shaped electrode 23, the magnetic toner gets crushed by the pressure, forms a solid layer on the surface of the ring-shaped electrode 23, and obstructs the fluidity of the magnetic toner.

In this embodiment, in order to solve this problem, the lead electrode 25 and the ring electrode 23 are held at a distance of one foot without contacting each other, and conduction is established using the magnetic toner transferred onto the magnetic roller sleeve. The % mark is the amount obtained.

As described above, when the toner chain stands up, the contact is good and the conductivity is high. For this reason, the magnetic pole of the magnetic roller 5 is fixed on the line connecting the lead electrode 25 and the ring-shaped electrode 23, and
If the toner chain is always kept standing between
The recording voltage applied to the lead electrode 25 passes through the toner layer into a ring shape 'l! It is induced in the pole 23 and recording becomes possible. Further, the distance between the lead electrode 25 and the ring-shaped electrode 23 may be set to a distance that does not impede the fluidity of the magnetic toner and allows electrical continuity to be obtained through the magnetic toner.

FIG. 6 is a cross-sectional configuration diagram of a printing section including a magnetic toner developing device according to this embodiment. A cylindrical sleeve 4 whose circumference is surrounded by a ring-shaped electrode 23 around a fixed magnetic roller 5.
rotates. A recording electrode 1 is provided at a constant interval d at a position facing an arbitrary magnetic pole of the magnetic roller 5, and the insulating recording body 3 is moved in contact with the recording electrode 1. On the other hand, a position t opposite to another arbitrary magnetic pole of the magnetic roller 5 and a certain distance e
Then, a lead electrode 1iA25 is provided. This interval d(!
:a varies depending on the resistance value of the magnetic toner used, but is 3
When using a magnetic toner that exhibits a resistance of 10 to 10 [Ω·picture] in a foot measuring electric field of CkV/cn+), the resistance is 02 to 0.7.
If the value is set to (a+i), the fluidity of the toner will be good,
Moreover, electrical continuity can also be obtained.

In the figure, when a recording pressure of opposite polarity is applied to the recording electrode Bl-d electrode 25, a current flows through the ring-shaped electrode 23 through a layer of toner in the interval 0, and the toner in the interval 4 is charged. The toner is injected, and a toner layer is formed on the insulating recording medium 3 in the same manner as described in FIG.

According to this method, since recording can be performed with the toner chain always standing directly under the recording electrode, the recording pulse [
]] A clear 1liI that does not cause a developing machine even if it is shortened.
An image is obtained. Furthermore, because the lead-fi electrode and ring-shaped electrode are kept non-contact, 1. Mechanical abrasion and adhesion of magnetic toner to the pair of ring-shaped electrodes can be prevented, and stable images can be obtained for a long time.

Next, still another embodiment of the direct recording device according to the present invention will be described. In this embodiment, consideration is also given to the toner supply method in this magnetic toner developing machine.

When a plurality of link electrodes 23 are provided on the cylindrical sleeve 4 as shown in FIG. 5, adjacent ON electrodes and OFF
The smaller the leakage current between the poles at t, the lower the i.

The inventors have completed a study on this point and found that the leakage current between adjacent electrodes increases as the thickness of the toner layer increases, regardless of the resistance value of the magnetic toner. . When using magnetic toner with the above-mentioned resistance value, leakage is not a problem if the thickness of one layer of the toner is less than a month, but if the thickness is more than a few layers, leakage between adjacent electrodes becomes large and recording becomes difficult. It turns out that it appears as a ghost in images.

Therefore, in order to obtain more stable recorded images, a new method of supplying toner was devised. In a conventional magnetic toner developing machine, as shown in FIG. 3, a toner hopper 27 is provided around the magnetic roller 5 to encompass it. In this method, since the toner for supply is filled in the toner hopper 27, a part of the circumference of the cylindrical sleeve 4 has a thickness of one layer of toner.
This results in a length of up to several tens (m), and leakage between adjacent ring-shaped electrodes becomes a problem.

In this embodiment ζ, in order to solve the above problem, the sixth
As shown in the figure, a toner hopper 27 is provided at a position independent and separate from the magnetic roller 5, so that the amount of magnetic toner supplied from the hopper onto the magnetic roller sleeve is always kept constant. In this embodiment, the toner hopper 2
7 is located at the top of the magnetic row 25 and is fed onto the cylindrical sleeve 4 from the outlet at the bottom. A supply guide 28 is provided at this outlet portion, and a cam 29 and a spring 30 allow the supply guide to slide in the direction of the arrow. When it is necessary to supply toner, the supply guide 28 is slid to constantly supply the amount of toner onto the cylindrical sleeve 4.

According to this embodiment, since the thickness of the toner layer in most of the circumference of the cylindrical sleeve 4 can be maintained at 1 [藺] or less,
This eliminates the problem of leakage between the a-electrodes. The toner supply method in this embodiment is just one example, and as shown in FIG. It may be supplied.

(G) Detailed Description of the Invention According to the present invention, since it is possible to perform recording with the toner chain always standing in the recording section of the direct recording device, high-speed recording can be performed by shortening the recording pulse width. Also, there is an effect that stable images can always be obtained without developing stripes.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the printing principle of the direct recording device according to the present invention, FIG. 2 is a diagram explaining the recording process of the direct recording device according to the present invention, and FIG. 3 is the configuration of the recording section in the conventional direct recording device. 4 is an explanatory diagram of the principle of development stripes, FIG. 5 is a block diagram of a recording section including a magnetic toner developing machine according to the present invention, and FIG. 6 is a recording section including a magnetic toner developing machine according to the present invention. FIG. 7 is an explanatory diagram of another embodiment of the toner supply method for a magnetic toner developing machine according to the present invention. In the figure, l is the recording electrode and 2 is the recording electrode needle. 3 is an insulating recording body, 4 is a cylindrical sleeve, 5 is a magnetic roller, 6 is a magnetic toner developing device, and 7 is a counter electrode. 8.9.10 is a cylinder, 12 is a recording paper, 13 is a transfer roller, 14 is a pressure binding machine, 16 is a corona static eliminator, 18
．． 19 is a magnetic toner, 20 is a charge, 21 is a segment portion, 22 is a lead portion, 23 is a ring-shaped electrode, 24 is an insulating layer, 25 is a lead polarization, 27 is a toner layer y Hg 2 B
29 is a supply guide, 29 is a cam, 30 is a spring, 31 is a blade, and 32 is a scraping screw. 1 ′°“1] Agent Patent Attorney Koji Matsuoka?, -, Sha-::
! Part b Penalty 7 Punishment

Claims (2)

[Claims] (1) A hollow cylinder made of a non-magnetic material is rotatably arranged outside a permanent magnet having a plurality of magnetic poles on its circumference, and one magnetic pole of the permanent magnet connects to a recording electrode via an insulating recording material. Magnetic rollers arranged to face each other, opposing arm poles consisting of a plurality of ring-shaped electrodes provided on the hollow cylinder and surrounding the outer periphery of the hollow cylinder, and opposed to a part of the outer periphery of the ring-shaped electrodes. 1. A direct recording device comprising: a plurality of lead electrodes for obtaining electrical continuity; (2) A direct recording device characterized in that electrical continuity is established between the lead electrode and the link-shaped electrode through magnetic toner transferred by the hollow cylinder.