JPH04369675A - Wet type copying machine - Google Patents

Abstract

PURPOSE:To prevent a toner image from being deformed at a fixing time and to obtain a high-quality image without image flowing. CONSTITUTION:A wet type developing and transferring system copying machine which executes wet type developing by using toner, transfers the obtained toner image on a transfer paper P and fixes the toner image by heating the unfixed toner image T1 by a heating means 13, constitutes a toner adhesion means 12 which generates an electric field or electric charge which makes the toner adhere to the transfer paper is disposed on a transfer paper carrying path O on an upperstream side than the heating means 13 so that the unfixed toner before fixing is made to adhere to the transfer paper.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet type copying machine using a wet type development and transfer type.

0002

2. Description of the Related Art Referring to FIG. 1, an example of a wet development transfer type copying machine will be described. Around the photoreceptor drum 1, which rotates clockwise, there is a charger 2 that uniformly charges the photoreceptor along the rotation direction, and a charger 2 that irradiates the charged photoreceptor drum 1 with an original image on a contact glass to staticize the photoreceptor. an exposure unit 3 for forming an electrostatic latent image; an eraser 4 for removing excess charge; a wet developing device 5 for converting the electrostatic latent image into a visible image (toner image);
A transfer charger 7 for transferring the toner image onto the transfer paper P fed from the paper feeding device 6, a separation roller 8 for separating the transfer paper after the toner image transfer from the photoreceptor drum surface, and a drum surface after the toner image transfer. a cleaning device 9 for cleaning the photoreceptor; and a static elimination lamp 10 for removing residual charges from the photoreceptor.
are arranged in this order.

[0003] An electrostatic latent image is formed on the photosensitive drum 1 charged by the charger 2 in the exposure section 3, and this electrostatic latent image is formed using a solvent in a wet type developing device 5 and a predetermined amount suspended in the solvent. A developing solution consisting of toner is supplied to develop a toner image. The transfer paper fed from the paper feeding device 6 is temporarily stopped by the registration rollers 11 and then waits, and is fed again in synchronization with the toner image on the photoreceptor drum, and is brought into close contact with the circumferential surface of the photoreceptor drum. The toner image is then transferred.

The transfer paper having the toner image transferred thereto and separated from the photoreceptor drum 1 is removed by a solvent removing means 12A (see FIG. 15), which is a part of the fixing pretreatment means 12, to remove excess solvent D from the toner image bearing surface. After the toner image is removed, the toner image is sent to the heating means 13, where the toner image is heated and fixed, and then sent out of the machine by a pair of conveying rollers 14.

Referring to FIG. 14, an example of the solvent removing means 12A included in the pre-fixing treatment means 12 will be described. The transfer paper P separated from the photosensitive drum 1 by the separation roller 8 is guided by guide plates 8a and 15. The solvent is sent to the solvent removing means 12A. The solvent removing means 12A includes a blotter roller 12a that contacts the toner image bearing surface of the transfer paper P, and a backup roller 12b that presses the transfer paper against this roller. The blotter roller 12a is made of a hygroscopic material such as nonwoven fabric. This solvent removing means 12A removes excess solvent in order to improve the fixing of the toner image in the heating means 13, which will be described below.

Referring to FIG. 14, an example of a heating means 13 for fixing a toner image onto a transfer paper will be described. A heating roller 13a and a pressure roller 13b are placed in pressure contact with each other, sandwiching the path of the transfer paper P carrying an unfixed toner image. The heating roller 13a is in direct contact with the unfixed toner image bearing surface of the transfer paper, and has a built-in heater 13aa. The heating roller 13a is made of a silicone rubber roller or a Teflon roller. The pressure roller 13b is pressed against the heating roller 13a at a predetermined pressure by the elasticity of a spring (not shown). A thermistor, a temperature fuse, etc. connected to a control device (not shown) are arranged around the heating roller 13a surrounded by the unit casings 13c and 13d to control the temperature of the means 13. Furthermore, a release agent coating felt 13ab and a separation claw 13ac are in contact with the circumferential surface of the heating roller 13a. The heating means 13 heats and fixes the toner image after excess solvent has been removed by the solvent removing means 12A.

FIG. 1 shows the form of the toner image after it is separated from the photoreceptor drum 1 and until it is fixed by the heating means 13.
Let's take a look at 1. The unfixed toner image T1 (see FIG. 15) immediately after transfer and before passing through the solvent removing means 12A is
As shown in FIG. 11A, the toner exists in the solvent D on the image bearing surface of the transfer paper P so as to be in close contact with the transfer paper P or to overlap with the toner that is in close contact with the transfer paper. When the unfixed toner image T1 at this stage passes through the solvent removing means 12A and excess solvent on the transfer paper P is removed (see FIG. 15),
Ideally, an unfixed toner image T3 shown in FIG. 11(c) is obtained. When this unfixed toner image T3 is sent to the heating means 13, it should be fixed as an ideal image like the toner image T4 shown in FIG. 11(d).

[0008]

[Problems to be Solved by the Invention] By the way, the unfixed toner transferred to the transfer paper adheres to the surface of the transfer paper due to electrical bonding force, and even in the toner layer, toner particles close to the surface of the transfer paper have a strong bond. Although the toner particles are attached by bonding force, the electrical bonding force between the toner particles and the surface of the transfer paper weakens as the toner particles move away from the surface of the transfer paper. In the prior art shown in FIG. 14, when the amount of solvent or toner adhering to the transfer paper increases due to environmental or other factors, the amount of residual solvent increases, or the toner particles in the toner layer and the transfer paper When the electrical bonding force with the surface becomes weaker, when the transfer paper is sandwiched between the rollers 12a and 12b of the solvent removing means 12A, as shown in FIG.
When the image is crushed like the toner image T2 shown in FIG. 1(b) and fixed by the heating means 13, it becomes an image of substandard quality like the toner image T5 shown in FIG. 11(e). There is a problem with this. This collapse of the toner image appears on the copy as image shift, solid unevenness, collapse of thin lines, and collapse of characters with a large number of strokes. If the cohesive force of the toner particles forming the unfixed toner image T1 becomes weak due to deterioration of the developer over time or a decrease in the amount of charge due to environmental changes, the bonding force between the toner particles and with the transfer paper P will decrease. Due to their small size, there are also partially suspended toner particles. When the unfixed toner image in such a state is sent to the heating means 13, the toner image T5 flows as shown in FIG. 11(e).
This results in an image of poor quality.

In particular, when using transfer paper such as a second original or an OHP sheet, which is difficult for the solvent to seep into, the toner image after fixing shown by the symbol T5 in FIG.
A phenomenon occurs in which the toner is washed away together with the solvent between the pressure roller 13a and the pressure roller 13b, and the image is significantly disturbed. To avoid this, it is conceivable to increase the voltage applied to the transfer charger 7 (see Figure 1) in order to strengthen the adhesion of the toner to the transfer paper, but this may cause side effects on the image and transport. There is a problem in that the potential cannot be set too high.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a wet-type copying machine that can prevent image bleeding during toner image fixation and obtain high-quality images.

[0011]

[Means for Solving the Problems] An object of the present invention is to heat an unfixed toner image carried on a transfer paper using a heating means that is brought into contact with the toner image bearing surface of the transfer paper. In a wet development transfer type copying machine that fixes a toner image, electric field generating means and electric charges are provided in a transfer paper conveyance path upstream of the heating means, which acts in a direction to bring the toner of the unfixed toner image into close contact with the transfer paper. This is achieved by a wet-type copying machine characterized by being provided with a toner adhering means such as a generating means.

0012

According to the first aspect of the present invention, the transfer paper carrying the unfixed toner image is brought into close contact with toner by the toner contact means before being sent to the heating means.

In the second aspect of the present invention, the transfer paper carrying the unfixed toner image is closely adhered with toner according to an electric field generated by the electric field generating means before being sent to the solvent removing means.

[0014] In the fourth aspect, before the transfer paper carrying the unfixed toner image is sent to the heating means, the toner is brought into close contact with the toner due to the relative relationship between the charge generated by the charge generating means and the toner.

[0015] In claim 5, before the transfer paper carrying unfixed toner is sent to the heating means, the toner is removed by a potential difference generated between the solvent surface and the non-toner carrying surface generated by the charge generating means and the static elimination brush. will be closely followed.

[0016]

EXAMPLES The present invention will be explained in detail below. In the following description, components equivalent to those of the prior art shown in FIG. 14 will be given the same reference numerals, and detailed description thereof will be omitted.

An embodiment according to claim 1 will be explained with reference to FIG. In FIG. 1, a pre-fixing treatment means 12 is provided in a transfer paper transport path O for a transfer paper P that is separated from the photosensitive drum 1 by a separation roller 8 and carries an untransferred toner image. The pre-fixing treatment means 12 includes a toner adhesion means that externally performs electrical processing on the toner of the unfixed toner image carried on the transfer paper P so that the toner adheres to the transfer paper. This is the main structure.

The unfixed toner image carried by the transfer paper separated from the photoreceptor 1 aggregates with weak bonding force between the toners and the transfer paper, as shown by the symbol T1 in FIG. 11(a). is in a state of When the toner adhering means applies an electric field passing through the transfer paper or applies a charge to the transfer paper carrying the unfixed toner image T1, the toner constituting the unfixed toner image T1 is transferred. The toner image T shown in FIG. 11(bb) is moved in a direction that comes into close contact with the paper P.
As shown in 2, the mutual cohesive force is strengthened and the sheets are brought into close contact with the transfer paper P. When the unfixed toner image T2 that has been brought into close contact with the transfer paper P is sent to the heating means 13 and is heat-fixed, this toner image becomes an image with no image fading, like the toner image T4 shown in FIG. 11(d). It is fixed on the transfer paper as. The pre-fixing treatment means 12 includes a solvent removing means 12A, and when the solvent D is removed after the toner adhering means acts, the unfixed toner image when fed into the heating means 13 is as shown in FIG. 11(c). 2 and 3 show an embodiment of claim 2. As shown in FIG. . Fixing pretreatment means 1 in this embodiment
2 includes a solvent removing means 12A and an electric field generating means 120 as a toner image adhesion means. First, the solvent removing means 12A includes a blotter roller 12a that contacts the toner image bearing surface of the transfer paper, and a backup roller 12b that is brought into contact with the blotter roller 12a. The blotter roller 12a is formed by forming a layer of a thick, liquid-absorbing solvent absorber around a core metal.

In the transfer paper transport path O, the solvent removing means 1
An electrode 121 of an electric field generating means 120 and its counter electrode 122 are disposed on the upstream side of 2A on the conveyance path between the pair of rollers 12a, 12b and the guide plate 15, sandwiching the conveyance path. The electrode 121 faces the back surface of the transfer paper P, and is selectively connected to the high voltage power supply V via the switch S. In this case, a voltage having a polarity opposite to that of the negatively charged toner is applied to the electrode 121. The counter electrode 122 is grounded. The switch S is controlled to be turned on when the transfer paper P passes between the electrodes.

As shown in an enlarged view in FIG. 3, when the transfer paper P carrying the unfixed toner image T1 is conveyed between the electrode 121 and the counter electrode 122, the switch S is turned on. An electric field is created between both electrodes. In this case, since a positive voltage with the opposite polarity to the toner is applied to the electrode 122, even if the toner particles in the solvent D have a weak cohesive force as shown in FIG. 11 (bb)
As shown in the toner image T2 shown in FIG. 2, the particles are attracted to the transfer paper P side and the binding force between the particles and the transfer paper P is strengthened. The toner image T2 that is in close contact with the transfer paper P is then removed by suctioning the solvent D by the blotter roller 12a, and the image shown in FIG. 11(c) is
), the excess solvent D is removed and an unfixed toner image T3 with no image deletion is obtained. When the transfer paper P carrying the untransferred toner image T3 with no image bleeding is fed into the heating means 13 and heated by the heating roller 13a and the pressure roller 13b, this unfixed toner image T3 becomes as shown in FIG. 11(d). ) is fixed as a high quality image without image deletion, such as the toner image T4 shown in FIG.

FIG. 4 shows an embodiment of claim 3. In this embodiment, the transfer paper guide plates 15A and 16A, which constitute the transfer paper transport path O and are located between the guide plate 8a and the solvent removing means 12A, also serve as electrodes of the electric field generating means. It is something that

Guide plate 15A facing the back side of transfer paper P
A high-voltage power supply V is connected through a switch S to act as an electrode. The guide plate 16A facing the toner carrying surface of the transfer paper P is grounded as a counter electrode.

When the transfer paper P carrying the unfixed toner image T1 is conveyed between the guide plate 15A which also serves as an electrode and the guide plate 16A which also serves as a counter electrode, the switch S is activated.
is on, creating an electric field between both guide plates. In this case, since a positive bias voltage having a polarity opposite to that of the toner is applied to the guide plate 15A, the toner particles in the solvent D can be moved even if the cohesive force is weak as shown in FIG. 11(a). , as shown in the toner image T2 shown in FIG. 11(bb), the particles are attracted to the transfer paper P side and the binding force between the particles and the transfer paper P is strengthened. Toner image T2 adhered to transfer paper P
Thereafter, the solvent D is removed by suction by the blotter roller 12a, and as shown in FIG. 11(c), an unfixed toner image T3 from which the excess solvent D has been removed and which has no image smear is obtained. When the transfer paper P carrying the untransferred toner image T3 is fed into the heating means 13 and heated by the heating roller 13a and the pressure roller 13b, the unfixed toner image T3 is heated as shown in FIG. 11(d).
) is fixed as a high quality image without image deletion, such as the toner image T4 shown in FIG.

An embodiment of claim 4 will be explained with reference to FIGS. 5 to 10.

First, in FIGS. 5 and 6, the separation roller 8
A charge generating means 130 is disposed between the guide plate 15 and the guide plate 17 in the transfer paper transport path O between the heating means 13 and the heating means 13 . The charge generating means 130 includes a charger 131 disposed with a casing opening facing the non-toner bearing surface Pb on the back side of the transfer paper P, and a charge wire 132 of the charger 131 via a switch S to which a positive voltage having the opposite polarity to the toner is connected. It consists of a high voltage power supply V that supplies high voltage.

Then, as shown enlarged in FIG. 6, the transfer paper P carrying the unfixed toner image T1 is transferred to the charger 13.
1, the switch S is on and a positive high voltage is applied to the charge wire 132. Therefore, a positive charge is generated on the back side of the transfer paper, and the negatively charged toner is attracted to the transfer paper P. The state of the unfixed toner image at this time is shown in Figure 11 (bb
). That is, the toner particles in solvent D are
Even if the cohesive force is weak as shown in FIG. 11(a), as shown in the toner image T2 shown in FIG. 11(bb), the particles are attracted to the transfer paper P side by positive charges and the particles are attracted to each other and the transfer paper The bond with P can be strengthened. The toner image T2 in close contact with the transfer paper P is then sent to the heating means 13 and heated by the heating roller 13a and the pressure roller 13b, resulting in image drift as shown in the toner image T4 shown in FIG. 11(d). The image will be fixed as a blank image.

The generation of electric charges occurs when the transfer paper P is connected to the means 130
It is controlled by turning on the switch S while passing through.

In the example shown in FIG. 7, a pair of charge generating means are provided sandwiching the transfer paper conveyance path. Above the first charge generating means 130, there is a second charger 141 with its opening facing the toner image bearing surface of the transfer paper P, and a second high voltage power supply V2 that supplies a high voltage to the second charger 141. Two charge generating means 140 are provided. The first charge generating means 130 is the same as that shown in FIG. 5, and generates a positive charge from the back side of the transfer paper. On the other hand, the second charge generating means 140 is activated by a switch S2 that is turned on when the transfer paper is conveyed between the chargers 131 and 141.
Charges of the same polarity as the toner are transferred to the toner-bearing surface Pa of the transfer paper surface.
to occur.

In this case, since the second charge generating means 140 generates charges of the same polarity as the toner, both chargers 1
Unfixed toner image T2 located between 31 and 141 (Figure 11
(see (bb)) allows the toner particles forming the toner particles to adhere to the transfer paper P more efficiently. In FIG. 8, an unfixed toner image T3 in which toner is brought into close contact with a transfer paper
As shown in FIG. 11(c), the toner particles are strongly coagulated with each other, and even when subjected to the fixing action of the heating means 13 later, image deletion does not occur.

In the example shown in FIG. 7, after the unfixed toner image is brought into close contact with the transfer paper, the transfer paper is sent to the heating means 13 without going through the solvent removal process. Normally, there is no problem even after going through this process, but for some reason the photoreceptor drum 1
If the amount of solvent carried on the transfer paper P separated from the transfer paper P is large, the load on the heating means 13 will increase, and the dryness of the obtained copy will be low. An example of dealing with this problem is shown in FIG.

The examples shown in FIGS. 9 and 10 have the characteristics of being able to obtain a transfer paper in a dry state without image blurring. In the transfer paper conveyance path O, on the upstream side of the heating means 13 and further upstream of the solvent removing means 12A, a first
A charge generating means 130 and a second charge generating means 140 are provided. The structure and operation of each charge generating means are the same as those shown in FIG.

As shown in an enlarged view in FIG. 10, when the transfer paper P carrying the unfixed toner image T1 is conveyed between the chargers 131 and 141, the switches S and S2 are activated.
is on, a high positive voltage is applied to the charge wire 132 and a positive charge is applied to the back side of the transfer paper, and a high negative voltage is applied to the charge wire 142 and a negative charge is applied to the image bearing side of the transfer paper. charges are generated respectively. That is, the unfixed toner image T1 carried on the transfer paper has a force that attracts the toner to the transfer paper due to the positive charge generated by the first charger 131, and a force that attracts the toner to the transfer paper due to the positive charge generated by the first charger 131.
A force that presses the toner against the transfer paper is exerted by the negative charge having the same polarity as that of the generated toner, and the toner is efficiently brought into close contact with the transfer paper. The state of the unfixed toner image in close contact with the transfer paper is shown in FIG. 11(bb). That is, the toner particles in solvent D are as shown in FIG.
), even if the cohesive force is weak as shown in Figure 11 (
As shown in the toner image T2 shown in bb), the particles are attracted to the transfer paper P side by positive charges, and are pressed to the transfer paper side by negative charges, thereby strengthening the binding force between the particles and the transfer paper P. It will be done. The toner image T2 in close contact with the transfer paper P is then sucked and removed by the blotter roller 12a, and as shown in FIG. 11(c), an unfixed toner image T3 from which the excess solvent D has been removed becomes. As shown in FIG. 11(bb), the aggregated unfixed toner image T2 is transferred to the blotter roller 12a and the backup roller 1.
Even if it is held between the lenses 2b and 2b, it will not cause image blurring. When the transfer paper P carrying this untransferred toner image T3 is fed into the heating means 13 and heated by the heating roller 13a and the pressure roller 13b, this unfixed toner image T3 is formed as shown in FIG. 11(d). The toner image T4 is fixed as an image without image deletion.

An embodiment of claim 5 will be explained with reference to FIG. In FIG. 12, a charge generating means 140 is provided in the transfer paper transport path O upstream from the heating means 13. The charge generating means 140 includes a charger 14 disposed with a casing opening facing the toner image bearing surface Pa of the transfer paper P.
1, and a high-voltage power supply V2 that supplies a positive high voltage of opposite polarity to the toner to the charge wire 142 of the charger 141 via a switch S2. Charge generating means 140
is disposed on the toner image bearing surface Pa side of the transfer paper P, and a grounded static elimination brush 150 is disposed at a position facing the charger. The static elimination brush 150 is configured by, for example, carbon fibers held between metal plates, and the tip of the brush is positioned so as to be in contact with the non-toner bearing surface Pb of the transferred transfer paper,
This surface is kept at approximately ground voltage.

When the transfer paper P carrying the untransferred toner image T1 is conveyed between the charger 141 and the static elimination brush 150, the switch S2 is turned on and the toner image carrying surface Pa of the transfer paper is is charge wire 142
A negative high voltage is applied to the non-toner image bearing surface Pb, and the charge accumulated on the non-toner image bearing surface Pb is released by the static elimination brush 150. The state of the unfixed toner image at this time is shown in FIG. 11(bb). That is, even if the toner particles in the solvent D have a weak cohesive force as shown in FIG. 11(a), the toner particles in FIG. 11(bb)
As shown in the toner image T2 shown in FIG. 2, the particles are attracted to the transfer paper P side by the positive charge, and the binding force between the particles and the transfer paper P is strengthened. The toner image T2 adhered to the transfer paper P is
After that, it is fed into the heating means 13 and the heating roller 13
a and the pressure roller 13b, and is fixed as a high-quality image without image deletion, such as a toner image T4 shown in FIG. 11(d).

That is, the transfer paper P is transferred from the charger 141.
Some of the negative charges applied to the toner image carrying surface Pa side of the transfer paper pass through the solvent D and the transfer paper P and reach the non-toner carrying surface Pb of the transfer paper.
Emitted via 0. Therefore, a large potential difference is generated between the non-toner carrying surface Pb of the transfer paper P, which is maintained at the ground voltage by the static elimination brush 150, and the surface of the solvent D. This potential difference is higher on the non-toner image bearing surface Pb, and the negatively charged toner is attracted toward the transfer paper P.
The adhesion between the toner and the transfer paper is strengthened, and even when the toner is sent to the heating means 13, it is fixed as a toner image without image fading.

The generation of electric charges occurs when the transfer paper P
While passing through the gap between the static elimination brush 150 and the switch S2
Controlled by turning on.

FIG. 13 shows an embodiment of claim 6. In this example, the static eliminating brush 150 is connected to the switch S3.
It is connected to high voltage power supply V3 via. High voltage power supply V3
is to apply a positive charge of opposite polarity to the charge (negative) of the toner image on the transfer paper P to the brush. The switch S3 is controlled on and off simultaneously with the switch S2 of the charge generating means 140.

When the transfer paper P carrying the unfixed toner image T1 is conveyed between the charger 141 and the static elimination brush 150, the switches S2 and S3 are on, and the back side (Pb) of the transfer paper A positive high voltage is applied by the static elimination brush 150 to the side of the transfer paper to generate a positive charge, and a negative high voltage is applied by the charger 141 to the image bearing surface Pa side of the transfer paper to generate negative charges. There is. In this case, the non-toner image bearing surface Pb of the transfer paper P is connected to the high voltage power supply V
It is higher by the output voltage of 3. Therefore, the potential difference between the non-toner image bearing surface Pa and the surface of the solvent D increases,
Unfixed toner can be brought into close contact with the transfer paper more efficiently.

FIG. 11(bb) shows the state of the unfixed toner image in close contact with the transfer paper. That is,
Even if the toner particles in the solvent D have a weak cohesive force as shown in FIG. 11(a), they are transferred by the positive charge of the high-voltage power source V3, as shown in the toner image T2 shown in FIG. 11(bb). By being attracted to the paper P side and being pressed against the transfer paper side by the negative charge of the charge generating means 140, the binding force between the particles and the transfer paper P is strengthened.
After that, the toner image T2 closely adhered to the transfer paper P has the solvent D removed by suction by the blotter roller 12a, and the image shown in FIG.
As shown in c), an unfixed toner image T3 is obtained from which the excess solvent D has been removed. As shown in FIG. 11(bb), the aggregated unfixed toner image T2 does not cause image deletion even when it is held between the blotter roller 12a and the backup roller 12b. Transfer paper P carrying this untransferred toner image T3
is fed into the heating means 13 and heated by the heating roller 13a and pressure roller 13b, this unfixed toner image T
3 is fixed as a high quality image without image deletion, like the toner image T4 shown in FIG. 11(d).

In this embodiment, even if the amount of solvent D in the developer transferred to the transfer paper increases due to changes over time, or in other words, even if the amount of solvent attached to the transfer paper increases, there is no margin for this. This results in a larger and more reliable copying machine.

[0041]

Effects of the Invention The effects of the wet type copying machine of the present invention will be explained for each claim.

In claim 1, the electrical bonding force between the unfixed toner image transferred onto the transfer paper and the surface of the transfer paper can be strengthened by the toner adhesion means, even under conditions where the amount of solvent adhesion and the amount of toner adhesion increase. Image deletion after passing through the heating means can be eliminated.

In claim 2, the distance between the transfer paper and the toner image can be reduced by pressing the unfixed toner image transferred to the transfer paper against the transfer paper by the electric field generating means,
Since the adhesion between the two can be strengthened, it prevents image drift when the solvent is removed from the transfer paper by the solvent removal means, and it also prevents image drift when the heating means is used, thereby preventing misalignment and toner image collapse. High quality images can be stably obtained.

In the third aspect, by making the transfer paper guide plate also serve as an electrode, the structure of the electric field generating means can be simplified and the transfer paper conveyance path can be shortened.

In claim 4, the unfixed toner image transferred to the transfer paper is pressed against the transfer paper by the charge generating means, so that the adhesion of the toner image to the transfer paper can be strengthened, so that image drift by the heating means can be prevented. It is possible to stably obtain high-quality images without misalignment or collapse.

In claim 5, the unfixed toner image transferred to the transfer paper is pressed against the transfer paper by the charge generating means, and the adhesion of the toner image to the transfer paper can be strengthened by the potential difference between the static eliminating brush and the solvent. Therefore, it is possible to prevent image drift in the heating means and to stably obtain high quality images without positional deviation or collapse.

In claim 6, by applying a voltage with a polarity opposite to that of the toner to the static elimination brush, the potential difference can be further increased, and the adhesion between the unfixed toner and the transfer paper can be further increased, resulting in a high quality image. can be obtained stably.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a wet-type copying machine showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the invention according to claim 2.

FIG. 3 is an enlarged front view of the main part of FIG. 2;

FIG. 4 is an enlarged view of a main part of the invention according to claim 3.

FIG. 5 is an enlarged front view of main parts of the invention according to claim 4.

FIG. 6 is an enlarged view of the main part of FIG. 5;

FIG. 7 is an enlarged front view of main parts of the present invention according to claim 4.

8 is an enlarged front view of the main part of FIG. 7. FIG.

FIG. 9 is an enlarged front view of main parts showing another embodiment of the present invention according to claim 4.

10 is an enlarged front view of the main part of FIG. 9; FIG.

FIG. 11 is an enlarged sectional view showing the form of a toner image before, during and after passing through a toner adhesion means and after passing through a heating means.

FIG. 12 is an enlarged front view of main parts showing an embodiment of the present invention according to claim 5.

FIG. 13 is an enlarged front view of main parts showing an embodiment of the present invention according to claim 6.

FIG. 14 is an enlarged front view showing an example of the configuration of a toner image heating means in a conventional wet type copying machine.

15 is an enlarged front view of the main part of FIG. 14. FIG.

[Explanation of symbols]

1... Photosensitive drum 7... Transfer charger 8... Separation roller 8a... Guide plate 12A... Solvent removal means 12a... Blotter roller 12b... Backup roller 13... Heating device 13a... Heating roller 13b... Pressure roller 15A... Guide plate 16A that also serves as an electrode... Guide plate 120 that also serves as a counter electrode... Electric field generating means 121... Electrode 122... Counter electrode V...High voltage power supplies S, S2, S3...Switch 130...Charge generation means 131...Charger 132...Charge wire 140...Charge generation means 141...Charger 142...・Charge wire 150...Static elimination brushes V2, V3...High voltage power supply P...Transfer paper O...Transfer paper conveyance path D...Solvent

Claims (6)

[Claims] Claim 1: Performing wet development using a predetermined toner,
In a wet-type copying machine that transfers the obtained toner image to a transfer paper and fixes the toner image by heating the unfixed toner image supported on the toner image bearing surface of the transfer paper by a heating means, the heating means A wet-type copying machine characterized in that a toner adhesion means is provided in a transfer paper conveyance path on a more upstream side, which acts in a direction to bring the toner of the unfixed toner image into close contact with the transfer paper. [Claim 2] Performing wet development using a predetermined toner,
The obtained toner image is transferred to a transfer paper, and the solvent on the transfer paper carrying the unfixed toner image is removed by a solvent removing means, and then the unfixed toner image is removed by a heating means brought into contact with the toner image carrying surface of the transfer paper. In a wet copying machine that fixes a toner image by heating the toner image, the toner of the unfixed toner image carried on the transfer paper is brought into close contact with the transfer paper in the transfer paper conveyance path upstream of the solvent removal means. A wet-type copying machine characterized by being provided with an electric field generating means that acts in a direction in which the image is generated. 3. The electric field generating means includes an electrode and a counter electrode that face each other across the transfer paper conveyance path, and the electrode and the counter electrode also serve as a transfer paper guide plate constituting the transfer paper conveyance path. 3. The wet type copying machine according to claim 2, further comprising: a wet type copying machine; [Claim 4] Performing wet development using a predetermined toner,
In a wet-type copying machine that transfers the obtained toner image to a transfer paper and fixes the toner image by heating the unfixed toner image supported on the toner image bearing surface of the transfer paper by a heating means, the heating means A wet-type copying machine characterized in that a charge generating means for generating a charge acting in a direction to bring toner particles of an unfixed toner image into close contact with the transfer paper is provided in a transfer paper conveyance path on the more upstream side. 5. Performing wet development using a predetermined toner,
In a wet-type copying machine that transfers the obtained toner image to a transfer paper and fixes the toner image by heating the unfixed toner image supported on the toner image bearing surface of the transfer paper by a heating means, the heating means On the toner image bearing surface side of the transfer paper conveyance path on the more upstream side, a charge generation means for generating an electric charge that acts in a direction to bring the toner particles of the unfixed toner image into close contact with the transfer paper is provided. A wet-type copying machine characterized in that static eliminating brushes that come into contact with the non-toner image bearing surface of the transfer paper are respectively disposed on the non-toner image carrying surface side of the transfer paper conveyance path. 6. The wet type copying machine according to claim 5, wherein a voltage having a polarity opposite to the polarity of the charge of the toner image transferred to the transfer paper is applied to the static eliminating brush.