KR100331327B1 - Air pumping apparatus for wet type printer - Google Patents

Abstract

A photosensitive medium which is supported by a plurality of support rollers and travels on an endless track, a developing unit which is installed on the traveling path of the photosensitive medium, and which is squeezed and squeezed after attaching the developer to the photosensitive medium, and downstream of the developing unit. An intake and exhaust device of a wet printer for supplying and discharging gas into and out of an engine shell having a drying unit for drying a developer remaining on a photosensitive medium, comprising: a suction path and an injection path respectively connected to the engine shell; A pump which is connected to each of the suction path and the injection path, sucks gas in the engine shell through the suction path, and supplies the sucked gas to the injection path; It is installed on the injection path, and the gas supplied from the pump is filtered to some of the re-supplied into the engine shell through the injection path, the rest is discharged to the outside; the intake and exhaust device of a wet printing machine comprising a do.

Description

Air pumping apparatus for wet type printer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake and exhaust device of a wet printing machine, and more particularly, to supply and discharge gas into and out of a so-called engine shell including a photosensitive belt which is a photosensitive medium and other devices installed around the photosensitive belt to contribute to a printing operation. An intake and exhaust device of a wet printing machine.

In general, a wet printing machine such as a wet electrophotographic color printer attaches a developer mixed with a solid toner having a predetermined color and a liquid carrier acting as a solvent to an electrostatic latent image region formed on a photosensitive medium such as a photosensitive belt to produce a desired image. It is a printing machine that outputs to printing paper after obtaining. One example of such a wet press is shown in FIG. 1.

Referring to FIG. 1, a wet printing machine includes a so-called engine shell 10 made of various devices contributing to a normal printing operation, and an intake and exhaust device for supplying and discharging gas into and out of the engine shell 10. .

The engine shell 10 is supported by a plurality of support rollers 11 to travel on an endless track, a plurality of developing units 15, a drying unit 16, a transfer unit 17, and the like. It includes.

As the photosensitive belt 12 is driven, its surface is maintained at a predetermined level by a charging unit 18, and an electrostatic latent image is formed by the light scanned by the laser scanning unit 19. The latent electrostatic image region of the photosensitive belt 12 formed as described above is developed by a developing roller 13 attached to a developing solution in which a toner and a liquid carrier are mixed, and then developed on the squeeze roller 14. The toner in the developing solution adhered by the film is filmed and most of the carrier is removed. Then, the predetermined amount of carriers remaining in the photosensitive belt 12 are dried and evaporated in the drying unit 16, and the filmed toner image is printed on the printing paper P in the transfer unit 17.

Meanwhile, a gas containing toner dust harmful to a human body is generated in the engine shell 10, in particular, in the engine shell 10 during the printing process, and it is necessary to prevent the gas from escaping to the outside. There is.

In addition, in the process of squeezing the developer attached to the photosensitive belt 12 by the squeeze roller 14, a so-called drip line in which a developer remains at a contact portion between the squeeze roller 14 and the photosensitive belt 12 is solidified ( D) occurs, and this drip line D needs to be removed for normal output of the printed image.

The intake and exhaust device is provided to remove the gas in the engine shell 10 and to remove the drip line (D), the supply pump 31 for pumping and supplying gas into the engine shell 10, the engine shell The suction pump 32 which inhales the gas in 10 is provided to the outside.

The supply pump 31 injects gas between the squeeze roller 14 and the photosensitive belt 12 through an injection path 33 having an injection nozzle 33a branched into each shape unit 15 to the injection pressure. In addition to the main function of removing the drip line (D), it serves as an auxiliary function to maintain the pressure to the outside by supplying the gas insufficient into the engine shell (10).

The suction pump 32 sucks in the gas in the engine shell 10 during the printing operation through the suction path 34 connected to the engine shell 10, and the gas sucked in the suction pump 32 is the suction pump. Filtered by the filter 36 provided in the discharge path 35 of (32) is discharged to the outside in a clean state to remove the harmful substances such as toner dust.

By the way, since the conventional intake and exhaust device having the configuration as described above uses two pumps, there is a problem that a lot of noise and vibration occurs when driving the pump. In addition, there is a problem in that the size of the device increases due to the large installation space occupied by two pumps, in contrast to the recent trend of miniaturization of devices.

The present invention was devised to solve the above problems, and an object of the present invention is to provide an intake and exhaust device for a wet printing machine having an improved structure for removing a drip line and discharging gas in an engine shell to the outside using a single pump. have.

1 is a schematic configuration diagram of a wet printing machine to which a conventional intake and exhaust device is applied.

Figure 2 is a schematic diagram of a wet printing machine to which an intake and exhaust device according to a preferred embodiment of the present invention is applied.

3 is a schematic cross-sectional view showing an extract of the filter shown in FIG.

<Description of Symbols for Major Parts of Drawings>

100..Ejinshell 112..Photosensitive belt

124..Squeeze roller 130..Drying part

140..Transfer 151.Suction path

152..Injection path 154..Pump

160.Filter 162.Case

164. Auxiliary filter element 166. Main filter element

In order to achieve the above object, an intake and exhaust device of a wet press according to the present invention is supported by a plurality of support rollers and travels on an endless track, and is installed on a traveling path of the photosensitive medium, and a developer is attached to the photosensitive medium. And a developing unit for squeezing and squeezing and a drying unit installed downstream of the developing unit to dry the developer remaining on the photosensitive medium. A suction path and a spray path respectively connected to the engine shell; A pump which is connected to each of the suction path and the injection path, sucks gas in the engine shell through the suction path, and supplies the sucked gas to the injection path; The filter is installed on the injection path, and filters the gas supplied from the pump to partially re-supply into the engine shell through the injection path and discharge the rest to the outside.

Hereinafter, an intake and exhaust device of a wet printing machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic configuration diagram of a wet printer to which an intake and exhaust device according to a preferred embodiment of the present invention is applied. Referring to the drawings, the wet printing machine includes a so-called engine shell 100 composed of various devices contributing to the printing operation, and an intake and exhaust device for supplying and discharging gas into and out of the engine shell 100.

The engine shell 100 is supported by a plurality of support rollers 111 and is provided on the photosensitive belt 112, which is a photosensitive medium that travels on an endless track, and is provided on the traveling path of the photosensitive belt 112 to contribute to the printing operation. And a plurality of developing units 120, a drying unit 130, a transfer unit 140, and the like.

The developing unit 120 is positioned below the photosensitive belt 112, and includes a developing roller 123 for attaching a developer to an electrostatic latent image region formed on the transfer surface of the photosensitive belt 112, and the photosensitive belt 112. And a squeeze roller 124 for squeezing the developer attached thereto. Here, the developer is an ink in which a solid toner having a predetermined color and a liquid carrier serving as a solvent are mixed.

The drying unit 130 is installed downstream of the developing unit 120, and is used to remove and remove a carrier remaining in the photosensitive belt 112 without being removed by the squeeze roller 124. The drying roller 132 which is contact-rotated at 112, and the heating roller 134 which is in contact with this drying roller 132 are provided.

The transfer unit 140 includes a transfer roller 142 which is in contact rotation with the photosensitive belt 112, and a fixing roller 144 which is in contact with the transfer roller 142 with the printing paper P therebetween. do.

In addition, on the driving path of the photosensitive belt 112, a charger 118 for maintaining the photosensitive belt 112 in a state of charge of a predetermined level, and alternately arranged with the developing unit 120 to the photosensitive belt 112. A plurality of laser scanning units 119 are installed to scan the light to form an electrostatic latent image.

The intake and exhaust device includes a suction path 151 and an injection path 152 connected to the engine shell 100, a pump 154 connected to each of the suction path 151 and the injection path 152, and the injection path ( The filter 160 provided in the 152 is provided.

The suction path 151 connects the engine shell 100 and the pump 154 and includes a gas in the engine shell 100, specifically, a gas containing harmful substances such as toner dust generated during a printing operation. The passage is moved from the engine shell 100 to the pump 154.

The injection path 152 connects the engine shell 100 and the pump 154 separately from the suction path 151, and into the engine shell 100 from the outside, specifically, the engine shell in the pump 154. It is a passage through which the gas supplied into the 100 is moved. The injection path 152 generally has a plurality of injection nozzles 152 ′, and each injection nozzle 152 ′ is predetermined to inject gas into a contact portion between the squeeze roller 124 and the photosensitive belt 112. Are placed at intervals.

The pump 154 provides a suction force to the suction path 151 to suck out the gas in the engine shell 100, and partially re-supply the sucked gas into the engine shell 100 through the injection path 152. And the rest is to be discharged to the outside.

On the other hand, the filter 160 is provided in the injection path 152 to filter the gas supplied from the pump 154 to continue to supply some to the injection path 152, the remaining is provided to discharge to the outside. As shown in FIG. 3, the filter 160 includes a case 162, an auxiliary filter member 164 installed in the case 162, and a main filter member 166.

The case 162 may include a gas inlet 162a through which the gas supplied from the pump 154 flows in, a gas outlet 162b through which some of the gas to be supplied to the injection path 152 passes, and , Has a gas outlet 162c through which the remaining gas is discharged to the outside. An injection path 152 is connected to each of the gas inlet 162a and the gas outlet 162b.

The auxiliary filter member 164 is interposed between an upper portion of the case 162, that is, the gas inlet 162a and the gas outlet 162b. The auxiliary filter member 164 is to filter out the gas introduced into the gas inlet 162a to filter out impurities such as dust and the like, and has a mesh or sponge structure that is commonly known.

As shown, the main filter member 166 is interposed below the case 162, ie, between the auxiliary filter member 164 and the gas outlet 162c. The main filter member 166 is to filter the gas filtered primarily by the auxiliary filter member 164 once again and discharge it to the gas outlet 163c. The main filter member 166 is to prevent harmful substances such as toner dust contained in the gas introduced into the case 162 and to prevent them from being discharged to the outside. The char is inserted into the case 162. The charcoal material as described above has the property of absorbing harmful components harmful to the human body, and is widely used as a filter material in the industry.

On the other hand, the case 162 is preferably provided with a plate 167 having a plurality of holes formed to distinguish between the auxiliary filter member 164 and the main filter member 166. By such a plate 167, it is possible to suppress the movement of charcoal or the like of the main filter member 166 to the auxiliary filter member 164.

The operation of the intake and exhaust device of the wet printer according to the present embodiment having the configuration as described above will be described.

First, the photosensitive belt 112 in which the electrostatic latent image is formed by the light scanned by the ranger scanning unit 119 during the printing operation passes through the developing unit 120. At this time, a developer supply nozzle which is not shown in the latent electrostatic image area is shown. The developing solution supplied from the film is attached by the developing roller 123. The attached developer is squeezed by the squeeze roller 124 so that the toner is filmed and most of the carriers other than the filmed toner are removed. However, during the squeegeeing process, a so-called drip line D is generated in the contact portion between the squeeze roller 124 and the photosensitive belt 112 so that the developer is excessively hardened.

In addition, the liquid carrier which is not completely removed by the squeeze roller 124 and remains in the photosensitive belt 112 is heated and dried by the drying roller 132 and the heating roller 134. Then, the toner filmed on the photosensitive belt 112 is transferred from the transfer unit 140 to the printing paper (P) to obtain a desired image.

Meanwhile, in the printing process as described above, a gas containing harmful substances such as toner is present in the engine shell 100 including the drying unit 130, including the vaporized carer vapor. The gas is driven into the pump 154 in the engine shell 100 through the suction path 151 by the suction force of the pump 154 by driving the pump 154. As such, the gas sucked into the pump 154 is forcibly moved into the case 162 through the gas inlet 162a by the pumping force of the pump 154. The gas moved into the case 162 is primarily filtered while passing through the auxiliary filter member 164 to mainly filter impurities such as dust contained in the gas. Here, a part of the primary filtered gas passing through the auxiliary filter member 164 is sent to the injection path 152 through the gas outlet 162b, and the injection nozzle 152 'branched from the injection path 152. Through the injection into the engine shell 100 is supplied again. Specifically, some of the gas is injected into the contact portion between the squeeze roller 124 and the photosensitive belt 112 through the injection nozzle 152 ′, thereby removing the drip line D formed therebetween by the injection pressure. Here, the gas injected through the injection nozzle 152 ′ is resupplied into the engine shell 100 in such a state that harmful substances are contained therein. In this case, even if harmful substances are contained, the original drip line D is removed. It is not a problem to achieve the purpose. In addition, the user can safely use the device because it is not leaked to the outside.

Meanwhile, the gas remaining in the gas outlet 162b from the gas passing through the auxiliary filter member 164 passes through the hole of the plate 167 and passes through the main filter member 166. As the gas passes through the main filter member 166, harmful substances such as toner dust contained in the gas are absorbed and removed. Therefore, the gas escaping through the gas outlet 162c is a safe gas from which harmful substances have been removed.

As such, the suction path 151 and the injection path 152 are connected to one pump 154 to remove the drip line D, and at the same time, the gas in the engine shell 100 is sucked in to absorb the negative pressure in the engine shell 100. In other words, the air pressure in the engine shell 100 is made equal to the external air pressure, thereby reducing vibration and noise than when using two pumps 31 (32 (see FIG. 1)). Installation space can also be reduced. In addition, by using one pump 154, the cost can be reduced.

In addition, by providing a filter 160 on the injection path 152, the gas re-supplied to the engine shell 100 is first filtered, and the gas discharged to the outside passes through charcoal material to remove harmful substances and is safe. By filtering in a state, it becomes possible to improve stability and reliability.

According to the intake and exhaust device of the wet press as described above, it is possible to effectively perform the drip line removal operation and the discharge operation for discharging the gas in the engine shell to the outside by providing a single pump, thereby reducing the number of pumps compared to the conventional And there is an advantage that can reduce the occurrence of vibration.

In addition, by reducing the number of pumps, the installation space can be reduced, contributing to the miniaturization and cost reduction of the device.

In addition, by installing a filter in the injection path, the gas re-supplied into the engine shell removes impurities and the gas discharged to the outside passes charcoal to remove harmful substances, thereby ensuring reliability and safety when using the device.

Claims (2)

A photosensitive medium which is supported by a plurality of support rollers and travels on an endless track, a developing unit which is installed on a traveling path of the photosensitive medium, attaches a developer solution to the photosensitive medium, and squeezes and squeezes it, and downstream of the developing unit. An intake and exhaust device of a wet printing machine for supplying and discharging gas into and out of an engine shell provided with a drying unit installed at a side to dry a developer remaining on the photosensitive medium, Suction paths and injection paths respectively connected to the engine shells; A pump which is connected to each of the suction path and the injection path, sucks gas in the engine shell through the suction path, and supplies the sucked gas to the injection path; It is installed on the injection path, the filter to filter the gas supplied from the pump to re-supplied part into the engine shell through the injection path, the rest is discharged to the outside; includes; The filter includes a case having a gas discharge port through which gas is discharged to the outside, a gas inlet port and a gas outlet port respectively connected to the injection path; An auxiliary filter member installed between the gas inlet and the gas outlet in the case to filter first the gas introduced into the gas inlet; And a main filter member installed between the auxiliary filter member in the case and the gas discharge port and filtering out harmful substances from the gas discharged to the gas discharge port. The method of claim 1, wherein the main filter member, Intake and exhaust device of a wet printing machine, characterized in that made of charcoal material that absorbs harmful substances harmful to the human body.