JPH0358847A - Image forming device using electrically conductive recording material - Google Patents

Abstract

PURPOSE:To enable the title image forming device to be cleaned without giving physical damage due to friction or the like to an image receiving material by a method wherein electrification is applied between the image receiving material of a blanket or the like and a component pinching a material to be recorded. CONSTITUTION:In order to clean ink on a blanket cylinder after end of recording, DC about 30V per about 80mm of a cleaning width is electrified from a power source BT2 employing an impression cylinder I as a positive electrode and the blanket cylinder B as a negative electrode, and residual ink is transferred to the impression cylinder I. Thereafter, in order to remove further the ink transferred onto the impression cylinder, the impression cylinder I is cleaned by utilizing electrification between the ink and the impression cylinder I by using a continuous band like cleaning web CW of paper, cloth, etc. or by an ordinary method. In the case where cleaning is performed by utilizing electrification, the impression cylinder is employed as a cathode and a conductive cleaning web CW side is employed as an anode. DC about 30V per about 80mm in electrification cleaning width is electrified from a power source BT3. The cleaning web is wound up and after use, is discarded together with the wiped off ink.

Description

[Detailed Description of the Invention] [Industrial Application Field] This method uses a recording material whose viscosity changes when energized and selectively puts the recording material into a non-contact state and a contact state with respect to an electrode portion. The present invention relates to technology for forming images using, for example, technology for providing printing machines, printers, and various image forming apparatuses.

[Prior Art] Examples of applying such an image forming principle are currently being proposed in the present application, Japanese Patent Application No. 70299/1983 filed by the applicant, and the like. Hereinafter, such an image forming method will be explained with reference to the drawings.

FIG. 2 shows an enlarged cross-sectional view of the image forming section, showing a pair of electrodes 2 facing electrode 1, and a recording material sandwiched between the pair of electrodes, the viscosity of which changes when energized. 3, and an image-shaped insulating portion 4 provided on the electrode.

This recording material is composed of at least a liquid dispersion and an electrolyte, and examples of materials that can be used are as follows.

Examples of polyhydric alcohol solvents that can be used as a liquid dispersion medium for the recording material of the present invention include ethylene glycol, propylene glycol, cyethylene glycol,
triethylene glycol, tetraethylene glycol,
Polyethylene glycol, (weight average molecular weight, approximately 100
~1000), ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monophthyl ether, methyl carbitol,
These polyhydric alcohol solvents may be used alone or in combination of two or more. The liquid dispersion medium accounts for 40 to 95% by weight of the entire ink.
It is preferable to contain 0 to 85% by weight. The polyhydric alcohol solvent may also be used in combination with other liquid dispersants.
It is desirable that the polyhydric alcohol solvent be contained in an amount of 10 to 100% by weight based on the total liquid dispersion medium in the recording material.

Other liquid fraction l'X! l. The medium can be selected from wood or other materials other than water, such as triethanolamine, formamide, dimethylformamide, dimethylsulfoxite 1 N-methyl-2
-Brolitone, l,3-dimethylimitanlycinone, N
-Methylacetamito, ethylene carbonate, acetamito,
Succinonitrile, cymethylsulfoxide, sulfolane, furfuryl alcohol, N,N-cymethylformamide, and the like may be used alone or in combination of two of them.

It is preferable to use an electrolytic material that does not generate halogen ions even by electrolysis. Further, the electrolyte used in the present invention should preferably be one that is difficult to deposit even by electrolysis, and one that can ensure electrical conductivity to the extent that voltage adhesion of the recording material can be smoothly controlled.

Preferred electrolytes that can be used in the recording material of the present invention include lithium borofluoride (LiBF) + sodium hexafluorophosphate (NaPF+;), ammonium hexafluorophosphate (Nll4PF6), and sodium acetate (Cll:+COONa). These electrolytes can be used alone or in combination with other electrolytes.

FIG. 3 shows a state in which one electrode 1 of a pair of 'it electrodes constituting this image forming part is an anode and the other electrode 2 is a cathode, and a voltage is applied thereto.

The tJS4 diagram shows a pair of electrodes separated from each other in opposing positions while a voltage is applied between them. In the figure, the recording material 3 does not adhere to the portion where the electrode 2 is in contact with the recording material 3, but the recording material 3 selectively adheres to the insulating portion 4 on the electrode 2. This creates a pattern using the recording material that corresponds to the shape of the electrodes and insulating parts. In FIG. 5, the polarity of the voltage applied between a pair of electrodes is reversed from that in FIGS. 3 and 4, with electrode 2 being an anode and electrode l
The figure shows a voltage being applied using the electrode as a cathode.

FIG. 6 shows a situation in which the opposing positions of the electrodes are separated from each other while a voltage is applied between the pair of electrodes; in this case, the recording material 3 is separated from the electrode 1 and adheres to the electrode 2.

In the case of Fig. 7, the opposing positions of the pair of electrodes are separated without applying a voltage between the pair of electrodes, and the recording material 3 records information on both electrodes 1 and 2 due to its own viscosity. material 3
If the recording material adheres to the recording material, it is impossible to form an image on each electrode.

[Problems to be solved by the invention] The present invention uses the above-mentioned image forming principle, uses the electrode 2 as an original plate, and further transfers the residual recording material to the flaket member when transferring it to the flaket member and then to the transfer paper. Removal was necessary, and such removal was not easily accomplished. The present invention provides easy cleaning of the flaket member in such a case. In addition to the bracket members, the present invention can also be applied to cleaning members that contribute to image format.

[Several Steps to Solve the Problems] The present invention provides an image forming apparatus that applies an ink material onto an original plate (master) and transfers the ink corresponding to the pattern of the original onto an image receptor. an original plate having a pattern of conductive parts and non-conductive parts; a coating means for applying a recording material as an ink material having different adhesion properties to positive and negative electrodes; It has an image receptor to which a pattern of the recording material is transferred, and a member to clean and remove the recording material remaining on the image receptor, and a bias voltage that causes the recording material to adhere to the image receptor is applied to the member to be cleaned and removed. It is something.

[Example] Hereinafter, the present invention will be explained in detail according to examples.

Example l FIG. 1 shows a first embodiment of the present invention.

KT is a recording material ink supply device that supplies ink to the plate cylinder P using an inking method using electricity. The wooden figure shows the time of cleaning, and the plate cylinder P and the ink supply device KT are separated.

Approximately 32+ in diameter facing the plate cylinder of the ink supply device under pressure
The positive (+) pole is a roll made of gold-plated steel, and the negative (-) pole is the plate cylinder P, which has a diameter of about 1.60 mm and has a light alloy surface with a conductive rubber layer 5 cm thick. , ″￥L
Ink is supplied using the above-mentioned image forming principle by applying DC current of about 30 V from the source BTI. The ink is selectively transferred to the non-conductive TL portion on the plate, which is composed of a conductive portion formed by a copper foil fixed on the plate cylinder P and a non-conductive portion made of resin, etc., to form an image. The ink image formed on the plate on the plate cylinder P is printed on the surface of a light alloy with a diameter of about 160 m using the above-mentioned image forming principle or by ordinary printing technology.
The image is transferred to a blanket cylinder B, which is an image receptor provided with a thick conductive rubber layer or a sheet-like conductive rubber having an equivalent thickness fixed to the surface. After that, the ink image is Franghetto IF! Recording material RP is held between pressurized and opposing impression cylinder ■ made of platinum-plated steel with a diameter of approximately 160 mm.
recorded in

At this time, the rotation speed of the blanket cylinder B was about 12 ORPM, and the recording speed on the recording material was about 1000 mm/sec.

To clean the ink on the blanket lpB after recording is completed, use the impression cylinder I as an anode and the blanket cylinder B as a cathode to clean the ink from the power supply BT2 with a width of about 8C) ats.
Approximately 30 V of DC current is applied to the cylinder to move the residual ink to the impression cylinder I.

After that, to remove the ink that has roughly moved onto the impression cylinder I, use a continuous belt-shaped cleaning cloth CW made of paper, cloth, etc.
The pressures 1 and 11 are cleaned by applying electricity between the pressure cylinder I and the pressure cylinder I, or by using a conventional method.

When cleaning using electricity, use the impression cylinder■
The conductive cleaning web CW side is used as the cathode and the conductive cleaning web CW side is used as the anode, and electricity is applied from the power source BT3 at about 30 V DC per cleaning width of about 80 mm. Wind up the cleaning web in the direction of the arrow and throw it away together with the ink that was wiped off after use.

The paper feeding device SP supplies paper or the like to the space between the blanket cylinder B and the impression cylinder I when the image formed on the blanket cylinder B reaches a predetermined position. The method of timing positioning with the image B is mechanical and electrical, either alone or in combination.

TP is a paper discharge device that takes out and aligns the recording material after printing.
Perform drying etc.

Example 2 FIG. 8 shows a second embodiment.

An example in which a cleaning freight CB is used instead of the method using the cleaning wafer CW shown in Example 1 will be shown.

Use the cleaning plate CB to apply electricity between the pressure 1}I, or use the usual wiping method to clean the impression cylinder.
Clean it.

When cleaning 1\ using electricity, the impression cylinder ■ is used as the cathode, the cleaning plate CB is used as the anode, and BT3 is used as the cathode.
When the cleaning cylinder width is about 80 mm4 and the dust is flowing and the current is applied at about 30 V, the ink on the impression cylinder I is
Move to the Cleaning Fred CB side.

The ink used in each of the above examples was chrycerin.
66 parts by weight Lithium borofluoride
7 parts by weight carbon flake 7 parts by weight colloidal hydrated silicate 34 parts by weight wood
2 2 parts by weight of flak ink.

[Effects of the Invention] As explained above, by using electricity between the image receptor such as a flangette and the member that clamps the recording material, it is possible to prevent physical damage to the image receptor due to friction etc. I'm coming for cleaning. It has the effect of being able to perform cleaning without adding special parts.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a device showing an embodiment of the present invention, FIGS. 2 to 7 are explanatory views showing the principle of the invention, and FIG. 8 is a sectional view of a device showing another embodiment. In the figure, 3 indicates a recording material such as ink, B indicates an image receptor such as a flangette cylinder, and ■ indicates an impression cylinder. Rei 8zu B-cho 3

Claims (1)

[Claims] (1) In an image forming apparatus that applies an ink material onto an original plate (master) and transfers the ink corresponding to the pattern of the original onto an image receptor, the original plate has a pattern of conductive parts and non-conductive parts; A coating means for applying a recording material as an ink material with different adhesion states to electrodes of positive polarity and negative polarity, an image receptor to which a pattern of the recording material on the original plate is transferred, and a recording material remaining on the image receptor and the recording material remaining on the image receptor. An image forming apparatus using an energized recording material, comprising: a member for cleaning and removing the material; and a bias voltage for adhering the recording material to an image receptor is applied to the member for cleaning and removing.