JP2000351192A - Printing apparatus and developing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing apparatus equipped with a developing device having small-sized and simple constitution as a means applying ink to a plate drum. SOLUTION: A printing apparatus uses a thermal water repelling printing plate as the printing plate 1-2 wound around each of plate drums 1-1 and uses a plurality of plate drums and an intermediate transfer device 4 to enable multicolor printing and each of developing devices 3 is mainly constituted of a developing roller 3-3 for applying printing ink to the printing plate wound around each plate drum 101, an ink fountain part 3-2 for temporarily storing ink within the developing device to supply the same to the developing roller, a blade 3-2-3 for adjusting the ink supplied to the developing roller from the ink fountain part to proper thickness, the shaking roller 3-4 provided on the downstream side of the blade to level the ink on the developing roller and an ink magazine 3-1 for supplying ink to the ink fountain part 3-2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly, to a method for performing single-color, multi-color printing and full-color printing using a plate drum on which a heat-sensitive water-repellent printing plate is wound and an intermediate transfer device. The present invention relates to a printing device that can be used and a developing device provided in the printing device.

[0002]

2. Description of the Related Art Heretofore, there has been a printing apparatus as an apparatus capable of forming a large amount of images from a single document, and there are methods such as offset printing and stencil printing. Generally, in a printing technique such as offset printing, a mechanism is used in which a printing plate wound around a plate drum is pressed against a printing material, and the pressure material causes the color material on the printing plate to adhere to and transfer to the printing material. In stencil printing, ink is extruded toward the surface of a printing substrate by using the above mechanical pressure. Printing includes single-color printing, multi-color printing, and full-color printing. In the case of multi-color or full-color printing, color superposition processing is required.

Conventionally, as a method of performing color printing, a printing plate is supplied from a plate supply device near the outside of the plate drum and conveyed, and is wound around the plate drum. After the king, the ink is overlaid on the blanket drum and transferred, and further transferred from the blanket drum to the paper (for example, Japanese Patent Publication No.
No. 71983), or a printing plate in which a silicon-based thin film is applied to a substrate base, and the printing plate is housed inside a plate cylinder of an offset printing machine, and is unwound onto the peripheral surface of the plate cylinder as necessary. After writing print data with a laser beam, offset printing is performed using this plate. As a plate used in these methods, a plate having water repellency is used as an example. In cleaning the plate, ink is wiped off manually by a printing technician.

[0004] Incidentally, the conventional printing apparatus is relatively large because it is a combination of drums. Therefore, it is often installed in a dedicated printing shop or the like, and it is often difficult to install it in a relatively small place such as an office. For example, in the case of an offset printing apparatus, a combination of a plate cylinder, a blanket cylinder, and an impression cylinder is required. In the case of full-color printing, the combination of the above three cylinders and an ink supply device for each color is calculated as the number of color separations. , A considerable installation area is required for the configuration of the offset printing unit for one color.
In addition, the tasks of offset printing, such as setting of the printing plate, preparation of ink, supply of printing paper, and color matching adjustment require skill, so a dedicated operator, a so-called printing worker, can perform the work manually. Many. In addition to such work, the printing technician also manually performs work such as cleaning of the printing press after printing and cleaning of each cylinder,
At present, printing by such unskilled clerks or the like can hardly be performed. Moreover, the printing press itself is very expensive, ranging from several millions to tens of millions, and can often be purchased only at a specialized printing shop.

Further, in terms of printing cost, a printing plate called a PS plate is most frequently used, but it is expensive, so if the number of printed sheets is not several thousands, the printing plate is relatively expensive. Since it does not fit, it cannot be easily obtained by ordinary users, and for this reason, as described above, it is currently limited to occupations specializing in printing, such as printing shops. Also, in the working environment for printing, the smell of the ink is unique, and the smell of the volatile solvent used for removing and cleaning the ink is also offensive. It is extremely bad and it is difficult to install it in a general office because the work is painful.

On the other hand, a stencil printing machine is simple and inexpensive to operate, that is, the price of the printing machine itself is several million yen. However, the maintenance cost is low because the cost of a stencil, which is a consumable product, is extremely low. . However, the stencil printing machine cannot perform full-color printing, and the printing quality is inferior to offset printing in the case of monochromatic printing because the printing method uses ink bleeding through perforations in the printing method. Is limited to simple printing, etc., and a full-scale printing device,
At present, it is not used as an apparatus having high image quality and capable of performing color printing.

[0007] In addition, a typical color printing press using an adhesive printing ink is provided with a plurality of printing units, and the printing units corresponding to the respective color inks individually form ink images of the respective colors on a printing drum, and Since the ink from the drum is transferred to the body of an individual transfer blanket drum, and the respective color ink images on the transfer blanket drum are sequentially superimposed on the printing paper and transferred to print a color image. A plurality of printing units having a plate drum, an inking device, and a transfer blanket drum are required (Y (yellow), M (magenta), C
(Four printing units are required for the inks of each color (cyan) and Bk (black)), which causes an increase in the size and cost of the apparatus. Also, in the method of superimposing the ink images of the respective colors on the printing paper as described above, since the accuracy of the superposition of a plurality of colors depends on the conveyance accuracy of the printing paper and the expansion / contraction of the paper, the occurrence of color misregistration or the like may occur. Unstable to

[0008]

SUMMARY OF THE INVENTION The present invention relates to the performance of the offset printing press and the stencil printing press described above in the field of printing.
It aims to solve issues such as machine price and easy operability. More specifically, the present invention is provided to solve some of the problems that the above-described conventional printing press has not been able to solve for many years. 178478, JP-A-8-276
No. 663), using a heat-sensitive water-repellent printing plate,
The purpose of the present invention is to provide a printing apparatus capable of maximizing the features of the plate. This heat-sensitive water-repellent printing plate is made of a material having water repellency, and has the property that the water repellency when heated is lost from the material, which is opposite to the water repellency, that is, becomes hydrophilic. The writing device can easily write a latent image. An ink image can be easily formed by applying an ink to the latent image portion of the plate and developing the latent image by a developing device. Further, since the heat-sensitive water-repellent printing plate is very low-priced and comparable to a stencil, the printing cost is low and printing can be performed from a small number of copies.

Accordingly, the present invention uses a heat-sensitive water-repellent printing plate having the above characteristics, is easy to operate, and is inexpensive.
Another object of the present invention is to provide a printing apparatus capable of performing multicolor printing configured to be small and compact. According to the present invention, the transfer material includes a transfer material on which a plurality of types of inks formed on the printing plate are sequentially transferred in a superimposed manner, and the adhesive ink image formed into a color image on the transfer material is transferred to printing paper at one time. The present invention provides a printing apparatus provided with an intermediate transfer device for performing color printing, thereby reducing the machine price of a printing device for performing color printing, and reducing the size and size of the machine. And, in the present invention, in a printing apparatus using such a novel heat-sensitive and water-repellent printing plate, an object of the present invention is to provide a mechanism embodying a novel developing function that has not been available before. An object of the present invention is to provide a printing apparatus including a developing device that can be manufactured at a low cost with a simple configuration. Another object of the present invention is to provide a specific configuration of a small and simple developing device provided in the printing apparatus.

[0010]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a plurality of printing plate drums having a printing plate wound around a peripheral surface, and printing ink applied to each plate drum. A developing device for supplying, an intermediate transfer device having a transfer material for transferring and receiving ink to be printed from each plate drum, a paper transfer device for transferring the ink transferred to the transfer material to printing paper, and a paper transfer device A printing paper supply device for supplying printing paper to the device, and a printing device having a cleaning device for cleaning the transfer material after printing as a basic configuration, wherein a heat-sensitive water-repellent printing plate is used as the printing plate, and The developing device includes a developing roller that applies printing ink to a printing plate wound around a plate drum, and an ink that temporarily stores ink in the developing device and supplies ink to the developing roller. A reservoir, a blade for adjusting the ink supplied from the ink reservoir to the developing roller to an appropriate thickness, a swing roller provided downstream of the blade to level the ink on the developing roller, and a It is a small-sized developing device mainly composed of an ink magazine for replenishing ink.

According to a second aspect of the present invention, there is provided a developing device provided in the printing apparatus according to the first aspect, wherein the developing roller applies printing ink to a printing plate wound around a plate drum;
An ink reservoir for temporarily storing ink in the developing device and supplying ink to the developing roller; a blade for adjusting the ink supplied from the ink reservoir to the developing roller to an appropriate thickness; and a downstream of the blade. A swinging roller for leveling the ink on the developing roller and an ink magazine for replenishing the ink reservoir with ink are provided in the unit, and the ink magazine is disposed above the ink reservoir, The reservoir is disposed above the upper half of the developing roller, the blade is disposed downstream of the ink reservoir when viewed from the ink flow direction, and the swing roller is disposed downstream of the blade when viewed from the ink flow direction. Are arranged on the developing roller of the above.

According to a third aspect of the present invention, in the developing device according to the second aspect, the blade is provided so as to be slidable on a side wall of a box forming an ink reservoir. The container is always disposed on the downstream side wall when viewed from the direction in which the developing ink flows on the developing roller. According to a fourth aspect of the present invention, in the developing device according to the third aspect, the blade is provided with an ink reservoir so as to be pressed against a developing roller at a point substantially at a central portion in a longitudinal direction of the blade. It is characterized by being held slidably on the side wall.

According to a fifth aspect of the present invention, in the developing device of the second, third or fourth aspect, the blade holds the shape and position of the blade so as to act as a counter in the rotation direction of the developing roller. It is characterized by being. According to a sixth aspect of the present invention, in the developing device according to the second, third, fourth, or fifth aspect, the blade has a shape in which a tip of a ridge line pressed by the developing roller has at least a radius of curvature R of 0.1 ( mm) or less. The invention according to claim 7 is claim 2,
6. The developing device according to 3, 4, or 5, wherein the blade has a wedge-shaped ridge line pressed against the developing roller. The invention according to claim 8 is the developing device according to claim 2, wherein the blade is made of an elastic material.

According to a ninth aspect of the present invention, in the developing device according to the second aspect, the ink reservoir is disposed above the upper half of the developing roller, so that the ink can be stored in a box shape. In addition, the box-shaped ink reservoir has a structure capable of rotating so as to approach or avoid the developing roller. Claim 1
The invention according to claim 0 is the developing device according to any one of claims 2 to 9, wherein the box body of the ink reservoir is provided with a sealing member for sealing a gap between the developing roller and three side walls, The other side wall is equipped with the blade. The invention according to claim 11 is the invention according to claim 10
In the developing device described above, the inlet on the side where the ink on the developing roller returns to the ink reservoir again has the same direction as the ink flow direction on the developing roller, that is, the direction of tailing with respect to the developing roller. A sealing member facing the developing roller is provided on both sides of the ink reservoir in the longitudinal direction of the developing roller, and a sealing member compressed on the end surface of the developing roller or the upper surface of the developing roller is provided.

The invention according to claim 12 is the invention according to claims 2 to 11
In the developing device according to any one of the above, the ink magazine for ink replenishment is provided substantially at an upper portion of the ink reservoir, and a replenishing port of the ink magazine is formed substantially at an upper portion of the ink reservoir. It is characterized by having. According to a thirteenth aspect, in the developing device according to any one of the second to twelfth aspects, the oscillating roller is installed downstream of the blade when viewed from the ink flow direction,
Further, the surface of the oscillating roller is a smooth surface having a mechanical surface roughness of 1.6 S or less. Claim 1
According to a fourth aspect of the present invention, in the developing device according to any one of the second to thirteenth aspects, the oscillating roller is made of a water-repellent material whose surface material can appropriately control adhesion to ink. Or a roller coated with a water-repellent material.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention, which is a full-color printing apparatus including a plurality of plate drums around which a heat-sensitive water-repellent printing plate is wound, a developing device, an intermediate transfer device, and the like. 1 shows an example of an apparatus. This printing apparatus includes a plurality of plate drum devices including a printing plate drum 1-1 on which a printing plate is wound, and a heat-sensitive and water-repellent printing plate 1-2 housed and held by the plate drum 1-1. 1, a writing device 2 for writing data to be printed on the printing plate 1-2 on each plate drum 1-1, and a developing device for supplying printing ink to the printing plate 1-2 on each plate drum 1-1 And a transfer belt 4 to which ink printed on the printing plate 1-2 on each plate drum 1-1 is transferred and temporarily received.
-1 and a paper transfer device (hereinafter referred to as a transfer roller device) having a transfer roller 5A for transferring the ink transferred to the transfer belt 4-1 to the printing paper S. 5), a printing paper supply device 7 for supplying the printing paper S to the transfer roller device 5, and a fixing device 9 for fixing the printing ink transferred to the printing paper S.
A paper discharge device 10 for discharging the print paper S after fixing, a paper discharge receiving device 11 for receiving the discharged print paper S, and a cleaning device 6 for cleaning the transfer belt 4-1 after printing is completed. I have. In this configuration example,
One transfer belt device 4 is arranged in the center of the printing device main body,
A plurality of plate drum devices 1 are arranged corresponding to the transfer belt 4-1 of the transfer belt device 4, respectively. A developing device 3 is arranged for each plate drum 1-1. The printing paper S is disposed near the upper portion, and a transport route for the printing paper S is formed at the lower portion of the printing apparatus main body. The transport route includes the printing paper supply device 7, the transfer roller device 5, the transport device 8, the fixing device 9, Paper device 10, paper receiving device 1
1 and the like are sequentially arranged.

In the configuration shown in FIG. 1, in order to solve some of the problems in the conventional printing press, the device units are arranged most effectively or rationally. And
In order to reduce the size and size of the entire apparatus, the intermediate transfer device is configured as a transfer belt device 4 using a transfer belt 4-1 so as to be vertically long, and the transfer belt device 4 is disposed substantially at the center of the printing device. However, by arranging the plurality of plate drum devices 1 in correspondence with the transfer belt 4-1 of the transfer belt device 4, it is possible to achieve a reduction in size, size, and space.

Further, in the configuration shown in FIG. 1, the printing plate 1-2 is stored and held in the plate drum 1-1 in order to reduce the size and cost. In this case, a separate plate supply device may be provided outside the plate drum. However, by storing the printing plate 1-2 in the plate drum 1-1 as shown in FIG. A type of printing device that supplies a plate from the outside of a plate drum, such as a plate storage space used in a stencil printing machine or a waterless sheet-fed printing press, a plate feeding device, a plate discharging device, and the like are unnecessary. This configuration is far more advantageous for miniaturization and cost reduction. Further, the printing plate 1-2 and the printing plate 1-2 can be further reduced in size and cost as a whole, including the transfer belt device 4, the printing plate 1-2, and the plate drum 1-1, and the performance can be improved. The plate drum device 1 having the plate drum 1-1 is symmetrically arranged on the left and right sides of the transfer belt 4-1 and has a common configuration on the left and right sides, and the whole is rationally arranged with good balance.

Further, in the configuration shown in FIG. 1, the curvature separation performance as an effective performance means of the transfer belt is effectively used for smooth conveyance of the printing paper S, for reducing jam of the printing paper as much as possible. In order to eliminate a large separation device and to make the conveyance path of the printing paper from the paper supply to the transfer, fixing, and discharging almost linear, the printing paper is provided at the lower part of the printing apparatus main body. The transport route of S is formed linearly, and the printing paper supply device 7, the transfer roller device 5, the transport device 8, the fixing device 9, the paper discharge device 10, the paper discharge receiving device 11 and the like are sequentially arranged on the transport route. ing.

As described above, in the printing apparatus having the structure shown in FIG. 1, the plate drum device 1, the writing device 2, and the developing device 3 are arranged symmetrically with respect to the transfer belt 4-1. Achieving commonality, downsizing and compacting of equipment,
In order to reduce the cost and transport the printing paper, a transport route for the printing paper S is formed at the lower part of the printing apparatus main body,
Since the process from paper supply to transfer, fixing, and paper discharge is configured almost linearly, stable performance can be ensured even for conveyance of print paper.

Although the above-described effects can be obtained by adopting the arrangement of the printing apparatus as shown in FIG. 1, the printing apparatus according to the present invention is not limited to this arrangement, and may be provided on one side of the transfer belt. It is also possible to adopt a configuration in which all the plate drums are linearly arranged and the transfer belt is arranged vertically, or a configuration in which the transfer belt is arranged horizontally and the plate drums are arranged side by side on the transfer belt. It can be configured.

Next, the configuration of each section of the printing apparatus shown in FIG. 1 will be described. First, in the plate drum 1-1 of each plate drum device 1 corresponding to each color of full-color printing, a plate supply roll 1-2-1 around which an unused heat-sensitive and water-repellent printing plate 1-2 is wound. And a plate supply mechanism composed of a take-up roll 1-2-2 for winding up a used plate, and the unused portion of the plate sent out from the plate supply roll 1-2-1 is stored in the plate. After exiting from the slit-shaped opening of the drum 1-1 and being wound around the outer periphery of the plate drum 1-1 and held, after printing is completed, the used portion of the plate is removed from the slit-shaped opening of the plate drum 1-1. It returns to the inside of the plate drum, and is wound up by the winding roll 1-2-2. Therefore, in plate supply, a new plate is automatically supplied to the plate drum surface by a plate supply mechanism housed in the plate drum 1-1, and after printing is completed, a used portion of the plate is automatically wound into the plate drum. The next new plate is supplied on the plate drum surface

The printing plate 1-2 and the plate drum 1-1
As is evident from FIG. 1, there is prepared only the amount corresponding to the basic color (process color) of full-color printing, for example, the amount corresponding to each ink of yellow (Y), magenta (M), and cyan (C). Further, there is another plate and plate drum for black (Bk) ink for characters and inking, and the plate and plate drums for four colors are provided in total. Further, a developing device having a small and compact configuration, which will be described later, is provided corresponding to each plate drum device 1.

The writing device 2 provided in each plate drum device 1 is a thermal head (thermal writing device) configured to be able to move up and down on the plate drum 1-1.
And the printing plate 1 wound around the plate drum 1-1.
2 is a device which descends when writing data for printing and comes into contact with the plate drum to write data, and then ascends and stands by. Here, the heat-sensitive water-repellent printing plate 1-2 is made of a water-repellent material, and has the property that the water-repellency when heated is lost from the properties of the material, and is opposite to the water-repellency, that is, the property is changed to hydrophilic. Thus, the latent image can be easily written by the thermal writing device 2 including a thermal head. More specifically, as the printing plate 1-2, for example, the present applicant has previously proposed (Japanese Patent Laid-Open No. 3-17 / 1990).
No. 8478, etc.) A heat-sensitive and water-repellent printing plate is used, and the heat-sensitive and water-repellent printing plate 1-2 is formed by repelling a fluorine-containing acrylate material on a substrate made of polyethylene terephthalate (PET). When a writing device 2 such as a thermal head writes data according to print data, a hydrophilic portion and a water-repellent portion are formed according to the written content, and ink is applied to the hydrophilic portion serving as a latent image. It can be attached. In the above example, an example of a writing device using a thermal head is shown. However, a writing device using a laser beam or the like can be used as the writing device. Also, plate drum 1
Although an example is shown in which the printing plate 1-2 is wound and then written on the printing plate at -1, it is also possible to adopt a method of writing on the printing plate (or while writing) and winding it around the plate drum.

The developing device 3 provided in each plate drum device 1 applies a color (yellow, magenta, magenta, yellow, magenta, magenta) to the printing plate 1-2 on which the printing data is written by the writing device 2 on the plate drum 1-1. (Cyan, black). The developing device 3 includes a plate drum 1-1.
A developing roller 3-3 for applying ink to the upper plate, an ink magazine 3-1 for replenishing ink, and an ink magazine 3--3.
An ink storage section 3-2 for storing the ink supplied from the developing roller 1 with the developing roller 3-3; and an ink storage section 3-2.
And a blade 3-2-3 for regulating the ink supplied to the developing roller 3-3 to an appropriate thickness, and rotating the ink on the developing roller 3-3 to remove the ink layer after passing through the blade 3-2-3. It is mainly composed of a swing roller 3-4 or the like that evens out. When an appropriate amount of ink is supplied to the developing roller 3-3, the developing roller 3-3 of the developing device 3 is pressed against the plate drum 1-1, and the printing data of the printing plate 1-2 described above is printed. The ink adheres and transfers to the latent image portion where is written. As described above, the transfer of the ink from the developing device 3 to the portion corresponding to the print data of the printing plate 1-2 causes an image of the printing ink on the plate drum 1-1. The present invention is characterized by the configuration of the developing device 3, and details of the configuration and operation of the developing device 3 will be described later.

The transfer belt device 4 has a rubber transfer belt 4-1 for temporarily transferring and receiving the developed ink on the plate 1-2 on each plate drum 1-1 as described above. The transfer belt 4-1 is stretched around a plurality of rollers such as a driving roller 4-3 and a driven roller. In order to print a plurality of sheets using the transfer belt 4-1, the transfer belt 4-1 receives supply of ink repeatedly from each plate drum 1-1, and transfers the ink from the transfer belt to printing paper each time. The plate drum must again meet the position on the transfer belt where the ink has been applied up to the previous time.
Therefore, the circumference of the transfer belt needs to be an integral multiple of the length of the plate drum.

The rubber constituting the transfer belt 4-1 is generally made of a material such as nitrile rubber or urethane rubber. The surface is given a surface roughness in consideration of the transfer of the ink from the plate drum 1-1 and the transfer of the ink to the printing paper. Further, inside the transfer belt 4-1 of the transfer belt device 4, the transfer belt 4-1 is pressed against the plate drum 1-1 at the time of printing at a position corresponding to each of the plate drums 1-1. 4-1 to plate drum 1
A platen roller 4-2 is provided to separate the platen 1-1 from the platen 1-1. After an ink image is formed on the plate drum 1-1, the platen corresponding to the plate drum 1-1 on the transfer belt 4-1 where the image is formed. The roller 4-2 presses the transfer belt 4-1 against the plate drum 1-1 so as to press the transfer belt 4-1.
-1 is transferred to the transfer belt 4-1.

Each platen roller of the transfer belt device 4 has a platen roller 4-2 and a pressing mechanism (not shown) for selectively pressing the platen roller 4-2 against the plate drum 1-1. The platen roller 4-2 and the pressure mechanism are provided at positions corresponding to the respective plate drums 1-1.

When an image is formed by ink on the plate drum 1-1, the transfer belt 4-1 is pressed against the plate on which the ink is placed by the action of the platen roller 4-2 and its pressing mechanism as described above. Naturally, the ink is transferred to the transfer belt 4-1.
Transfer to In this way, the formation and transfer of the required color ink image is performed at each plate drum. In the printing apparatus of FIG. 1, yellow, magenta, cyan, and black inks necessary for color printing and the like are prepared for the four plate drums 1-1. , Cyan and black ink images are formed, and then transferred to the same position on the transfer belt 4-1 in a superimposed manner, thereby enabling full-color printing. If a specific one is selected from the four drums, selective printing such as one-color printing, two-color printing, and three-color printing, and special color printing can be performed. The transfer belt 4-1 to which the ink from each plate drum has transferred is
The paper is conveyed to the lowermost end of the transfer belt device 4 and is combined with the printing paper S by the transfer roller device 5, so that the ink is finally transferred onto the printing paper S.

Another important component of the transfer belt device 4 is a driving roller 4 for driving the transfer belt 4-1.
-3 and a tail roller 4-4 that applies tension to the transfer belt 4-1. Immediately below the belt driving roller 4-3 located at the lowermost end of the transfer belt device 4, as shown in FIG. Is provided with a transfer roller 5A of a transfer roller device 5 that presses and transports the printing paper S together with the transfer belt 4-1.

Another important structure is a structure for separating the printing paper from the transfer belt 4-1 in order to prevent the printing paper S after the ink transfer from being wound around the transfer belt 4-1. is necessary. Conventional printing presses employ a device that mechanically grips the paper before transfer on a transfer drum or the like to transport the paper and separate it after transfer, or a separation drum with a separation claw or the like. However, all of them are expensive and complicated in configuration, are unstable and cause paper jam.

One of the features of the transfer belt device 4 of the present configuration is that a curvature separating portion utilizing the characteristics of the belt is provided in a part of the transfer belt as a means for solving such a problem. That is, in the transfer belt device 4 having the configuration shown in FIG.
A separation roller 4-5 having a small diameter is provided at a position where the printing paper after transfer is separated, so that the curvature of the belt portion applied to the separation roller 4-5 is very small. Therefore, the printing paper S is wrapped around the belt by the action of the stiffness of the paper itself and the portion where the curvature of the transfer belt 4-1 is small (the portion applied to the separation roller 4-5: the separation portion). The paper is conveyed so as to be peeled off naturally, and the printing paper is automatically separated from the transfer belt 4-1.
It is sent to the transport device 8 side.

In the printing apparatus shown in FIG. 1, a transfer roller device 5 installed opposite to a lower portion of the transfer belt device 4 applies printing ink on the transfer belt 4-1 to a printing paper S.
Roller 5A for transferring pressure to the transfer roller 5A, and the transfer roller 5A
Mechanism 5B (consisting of a transfer roller support arm, a cam, a spring, etc.
A mechanism that swings the arm with a cam to move the roller into and out of contact. Then, when the printing ink on the transfer belt 4-1 comes just below, the printing paper supply device 7
And the printing paper S is supplied by the registration rollers 7A,
At this time, the transfer roller 5A is brought into contact with the transfer belt 4-1 to transfer the printing paper S to the transfer belt 4-1.
1 and the paper is conveyed, and the printing ink on the transfer belt 4-1 is transferred to the printing paper S.

On the other hand, the cleaning device 6 serves to clean the transfer belt 4-1 when the printing ink on the transfer belt 4-1 is transferred to the printing paper S and printing is completed. The cleaning roller (or cleaning brush) or the cleaning blade removes the residual ink of the previous printing from the transfer belt 4-1 and performs cleaning.

The printing paper supply device 7 includes a storage section for the printing paper S, a paper feeding roller, and the like, and feeds the printing paper S one by one toward the transfer section at the timing of printing. The transport device 8 is a transport belt in the example of FIG. 1, and the printing paper S on which the printing ink is transferred and separated from the transfer belt 4-1.
To the fixing device 9 in the next step. The fixing device 9 is a device for firmly fixing the ink in a dry state on the printing paper S to the paper. The fixing device 9 includes a fixing roller 9A and a pressure roller 9B that is pressed against the fixing roller 9A. The fixing roller 9A is a roller composed of an oil-resistant rubber (for example, silicon rubber, fluorine rubber, or the like) that absorbs the solvent of the printing ink. Further, if a heat source (electric heater, halogen lamp, or the like) for promoting fixing is provided inside the fixing roller, better fixing can be achieved. The printing paper S after the fixing is fed to a paper discharging device 10 including a pair of rollers and the like.
The printing paper S discharged out of the printer is discharged onto a tray of a discharge receiving device 11 installed on the side of the printing apparatus main body.

The embodiment of the printing apparatus according to the present invention has been described above with reference to FIG. 1. The printing apparatus according to the present invention is a printing apparatus capable of full-color printing, and processes ink of each color required for full color. This is a printing apparatus having four similarly configured printing units for printing. The plate drum device 1 that stores the printing plate in each printing unit stores the heat-sensitive and water-repellent printing plate, which is also a prior application of the present invention, inside the plate drum, and automatically creates a new product when necessary. The used part is exchanged, the used part is wound up, and the exchange for a new plate can be automatically performed by the plate drum portion. In a printing apparatus using such a plate drum, conventionally, the PS plate was manually wound around the plate drum and all the operations such as positioning were manually performed. Therefore, after printing, replacement of the plate was also a serious task. Although the printing operation efficiency is remarkably inefficient, the printing apparatus of the present invention can remarkably improve this point. The present invention has a feature in the configuration of a developing device that applies a printing ink to a plate on a plate drum and develops a latent image, among the printing devices having such a configuration. Or, this is an optimal proposal for forming a printing apparatus that is strongly conscious of small-scale printing and the like. Further, the developing device according to the present invention is useful for reducing the size of a printing device, developing an inexpensive printing device, and also useful for easy operation.

Hereinafter, the specific structure, operation, and effects of the developing device according to the present invention will be described in detail. FIG. 2 is a schematic configuration diagram showing an example of the developing device according to the present invention.
The developing device 3 mainly includes a developing roller 3-3 for applying printing ink to a printing plate wound around a plate drum, and a temporary storage of ink in the developing device for storing the developing roller 3-3. Box-shaped ink reservoir 3-2 for supplying ink to ink tank 3
And a blade 3-2-3 for adjusting the ink supplied from the ink reservoir 3-2 to the developing roller 3-3 to an appropriate thickness.
And a swing roller 3-4 provided downstream of the blade 3-2-3 to level the ink on the developing roller, and an ink magazine 3-1 for replenishing the ink in the ink reservoir 3-2. In three units 3-5. The ink magazine 3-1 is disposed above the ink reservoir 3-2, the ink reservoir 3-2 is disposed above the upper half of the developing roller 3-3, and the blade 3-2-3 is used for ink flow. The oscillating roller 3-4 is disposed downstream of the ink reservoir 3-2 when viewed from the direction, and the blade 3-2-3 is viewed from the ink flow direction.
Is disposed on the developing roller downstream of the developing roller.

The part for supplying ink to the plate drum by a normal offset printing machine or the like is composed of an ink replenishing section and a number of ink kneading rollers and developing rollers, and the apparatus configuration is complicated. In order to make the developing device small, simple and inexpensive, the portion for supplying ink to the plate drum is provided with a single developing roller and a blade and a blade which supply ink properly on the developing roller. It is composed of a developing roller section mainly composed of a swing roller.
In other words, the point that almost all of the necessary functions of ink are performed on the developing roller is not common sense of the conventional printing press. In this way, miniaturization and simplification are achieved.

Further, an ink magazine for ink replenishment 3-
1 is disposed above the ink reservoir 3-2 on the developing roller, and when the ink in the ink reservoir 3-2 runs out, it is detected by an ink remaining amount detection sensor (not shown), Is dropped from the replenishing port 3-1-5 to the ink reservoir 3-2 immediately below. That is, in the present invention, the ink magazine 3-1 is disposed above the ink reservoir 3-2 in order to easily replenish the ink from the ink magazine 3-1 and to downsize and simplify the developing device. Then, the ink is dropped and replenished in the ink reservoir 3-2, so that the ink can be replenished without providing a special ink supply mechanism or the like.

In a conventional printing machine, ink is usually replenished by pumping up or pushing out from an ink replenishment magazine or a cartridge or a replenishment tank with a pump or the like, transferring the ink with a pumping roller or the like, and replenishing the developing roller. In the developing device 3 according to the present invention, the ink magazine 3-1 is disposed above the ink reservoir 3-2 in order to eliminate such a complicated configuration at all. The mechanism is very small, simple and inexpensive. Therefore, as described above, the ink reservoir 3-2 must necessarily be formed in the upper half of the developing roller 3-3. These are all essential requirements for an arrangement for a small and simple developing device.

Next, the structure of each part of the developing device 3 will be described in more detail. First, the ink reservoir 3-2 has a box shape, extends in the longitudinal direction up to the axial front and rear side ends of the developing roller 3-3, and extends to a width required for printing.
A part of the side wall of each side end of the box forming the ink reservoir 3-2 has an arm 3-2-4 extending further rearward from the ink reservoir 3-2. -2-4
The rotary shaft 3-2-5 is provided so that the ink reservoir 3-2 can be rotated close to or away from the developing roller 3-3.
And the extended arm 3
At the end 3-2-4-1 of -2-4, although not shown, the arm 3-2-4 is rotated to bring the ink reservoir 3-2 close to the developing roller 3-3. Alternatively, there is a mechanism for avoiding the rotation, and the mechanism is coupled to a drive source (not shown) via the mechanism, so that the ink reservoir 3-2 can be rotated close to or avoided. This drive source can be operated as a density change command from an operation panel or the like of the printing apparatus, and the box of the ink reservoir 3-2 is controlled so as to avoid or approach the developing roller 3-3. Further, as is apparent from the above description of the mechanism, the blade 3 movably held by the ink reservoir 3-2.
Reference numeral 2-3-3 is a control operation for approaching or avoiding the ink reservoir section 3-2 so that the pressure applied to the developing roller 3-3 can be adjusted and controlled.

By controlling the pressure of the blade 3-2-3 in this way, the developing roller 3-2-3 can be controlled.
Since the thickness of the ink film 3 can be freely and instantaneously controlled from the outside, the print density can be easily changed. The greatest feature of the control of the ink film thickness by the blade 3-2-3 is that the ink film thickness can be changed instantaneously, unlike the density control of the conventional method of transferring ink by a large number of rollers. In other words, the conventional density changing method requires a large number of fray papers (density check test papers), but this is not applicable to the office machine OA field and the DTP field. Therefore, in the present invention, the printing density can be easily changed by controlling the ink film thickness by the blade 3-2-3, thereby realizing a printing apparatus which can be used like a copying machine.

The pressing of the blade 3-2-3 against the developing roller 3-3 has the basic structure as described above, but the blade 3-2-3 is pressed against the developing roller 3-3 with a uniform pressure. In order to achieve this, the following measures are required. For example, the accuracy of the outer shape and the rubber hardness of the developing roller 3-3 are uneven, the straightness and the flatness of the blade 3-2-3 are out of order, the flatness of the held side wall is out of order, and the box is twisted. In this case, uniform pressurization cannot be achieved if the container is integrally held by the box. Therefore, the blade 3-2-3 has a shape and a structure such that the blade 3-2-3 is pressed on one side near the center in the longitudinal direction of the blade on the side wall of the box of the held ink reservoir 3-2. . In this case, since the pressure is applied at a central point of the blade 3-2-3, the blade 3-2-3 absorbs most of the above-mentioned irregularities, and is uniformly pressed by the developing roller 3-3.

If the shape of the tip of the ridge line pressed against the developing roller 3-3 of the blade 3-2-3 is not a sharp shape, a high-sensitivity performance for instantly changing the ink film thickness as described above is expected. Can not. Therefore, the tip shape of the blade 3-2-3 requires a sharpness with a radius of curvature R of at least 0.1 mm. The thickness of the blade 3-2-3 is 1 mm.
In the case of the following plate thickness, the sharp corner of the following R may be used, but in the case of a thick blade, the tip shape of the blade 3-2-3 is changed as shown in FIGS. Must be wedge shaped. In either case, if the front end is not held on the side wall of the box of the ink reservoir 3-2 so that the action in the counter direction acts on the rotation direction of the developing roller, the sharp end of the bent end is also effective. Does not work. Therefore, the blade 3-2-3 is held so as to act as a counter to the developing roller 3-3. In the example shown in FIG. 2, the width direction of the blade 3-2-3 is the developing roller 3-3.
Is held at an angle in the direction of the center axis in which the tip of the tip slightly bites into the developing roller 3-3.

On the other hand, the blade may be formed of an elastic body. FIG. 4 shows an example of a blade 3-2-3 ′ formed of a metal material having a spring property. In such a case, unlike the above-mentioned rigid blade, a slide mechanism is not required, and the developing device is simpler. In the example shown in FIG. 4, the tip of the blade 3-2-3 'for scraping ink has a shape like a tongue, and the tip and the belly of the tongue are lightly pressed against the developing roller 3-3. Therefore, the tip of the blade is always lightly pressed against the developing roller 3-3, and an efficient blade effect can be exhibited by the action of the counter. It should be noted that the developing device shown in FIGS. 2 and 4 differs only in the configuration of the blade portion, and the other configurations are the same.

Next, regarding the ink storage performance of the box constituting the ink storage section 3-2, the sealing property of the ink will be further described. Box 3-2 Constituting Ink Pool 3-2
Except for the side wall with the blade 3-2-3 (or 3-2-3 ') of the -1, ink is applied on the other three side walls of the box 3-2-1 on the developing roller 3-3. A seal member 3-2-6 is provided so as not to flow out, and one side seal and one inlet seal are provided. In short, the box 3-
Reference numeral 2-1 designates an ink reservoir part which is sealed on the developing roller on three sides by a seal member, and the remaining one is partitioned by a blade 3-2-3. On the side where the ink recirculates, the seal is a skirt-shaped seal at a location other than the blade and is attached in a tailing direction with respect to the rotation direction of the developing roller 3-3, that is, in a direction in which the ink flows. Have been. When the seal is attached in this direction, the reflux ink can return to the ink reservoir 3-2, but the ink in the ink reservoir does not leak in the opposite direction. Also,
Paper dust and dust adhering from the plate drum also have the effect of being blocked by a seal with an appropriate sealing force. Also,
The side seal is provided by pressing an elastic sealing material against the end surface of the developing roller 3-3 or the outer diameter surface of the developing roller 3-3. This is to seal the ink so that the space between the developing roller 3-3 and the developing roller 3-3 does not open when the box 3-2-1 of the ink reservoir 3-2 approaches or moves up or down with respect to the developing roller 3-3. It is of course necessary to prevent leakage from the side.

Next, the seal on the blade side of the ink reservoir 3-2 will be described. Box body 3 of ink reservoir 3-2
As described above, 2-1 is rotatably supported by the arm 3-2-4 and is provided so as to be able to approach or avoid the developing roller 3-3 together with the blade 3-2-3. However, the blade 3-
In 2-3, the pressure can be adjusted and controlled with respect to the developing roller 3-3, but on the contrary, the sealing property of the ink in the ink reservoir 3-2 becomes a problem. Naturally, in order to prevent the ink from leaking out even when the box body 3-2-1 of the ink reservoir part is bypassed from the developing roller 3-3, the sealing member 3-2-6 is attached to the developing roller 3-3. It is necessary to make the seal elastic. On the other hand, since the blade 3-2-3 is a metal body and is not extendable and contractable like a seal, the blade 3-2-3 is movable with respect to the side wall of the box 3-2-1 of the ink reservoir as described above. Must be retained. Here, "movable" means that, as shown in FIG. 3, the blade 3-2-3 has its central portion located at the side wall 3--3 of the box 3-2-1 on the downstream side in the ink flow direction.
2-1-1 and slotted screw 3-2-3-2 and stepped screw 3
-2-3-1 is held in a slidable state,
It is lightly pressed against the developing roller by the spring force of a light leaf spring 3-2-1-1 fixed to the side wall 3-2-1-1 side with a screw 3-2-1-2.

When the box 3-2-1 of the ink reservoir is close to the developing roller, the blade 3-2-3 becomes integral with the movement of the box itself when the slidable range of the blade exceeds the limit. Arm 3-2- of ink reservoir 3-2
The blade 3-2-3 is pressed against the developing roller 3-3 by a strong force acting externally on the blade 4. Also, in the case where the box body 3-2-1 of the ink reservoir is avoiding from the developing roller 3-3 and the blade 3-2-3 is in the sliding state,
This is to avoid the pressing force of the blade at the time of aging during printing preparation or after the end of printing to prevent the impression of the developing roller by the blade. In this case, the pressing force is separately applied to the blade 3-2-3. Leaf spring 3-2
The blade is lightly pressed against the developing roller 3-3 by the spring force of -1-1. This is the ink reservoir 3
This is a structure for preventing the ink No. 2 from leaking from the blade side.

Next, the swing roller 3-4 will be described.
As shown in FIG. 2 (or FIG. 4), the oscillating roller 3-4 is provided downstream of the blade 3-2-3 when viewed from the ink flow direction, and the ink film thickness made substantially uniform by the blade is reduced. It also serves to smooth out fine streaks made of blades. The oscillating roller 3-4 is rotatably supported at one end of a substantially L-shaped arm 3-4-1. The arm 3-4-1 has a substantially central bent portion at the shaft 3-4. -2 so as to be rotatable. And arm 3-4-
A coil spring 3-4-3 to which a tensile force is applied is provided between the other end of the first roller 1 and the unit of the developing device, and the oscillating roller 3 is driven by a spring force acting on the arm 3-4-1. -4
Is pressed against the developing roller 3-3. Therefore, the swing roller 3-4 is always pressurized by the developing roller 3-3, and is rotated by receiving a rotational force from the developing roller 3-3. The ink used in this printing apparatus is a tacky ink having a viscosity similar to that of offset printing. Thus, ink also helps to convey rotational force. The swinging movement of the swinging roller 3-4 includes a cam (not shown) for swinging the shaft end of the swinging roller 3-4, and a cam follower (see FIG. (Not shown), the roller swings back and forth in the longitudinal direction of the shaft. In addition, the driving force for swinging uses the above-described rotational force of the roller.

On the other hand, the rotational force is obtained from the ink when the swing roller 3-4 is made of a surface material such as metal. Since the ink adheres very well to the metal, the rotational force is transmitted well. However, on the contrary, due to the stickiness, the sliding force in the longitudinal direction of the swing roller at the time of swing becomes very large, and a large load is applied to the swing cam and the cam follower. Further, in the case of a metal roller, the ink adheres to the roller surface, and the leveling performance of the ink may be hindered. In other words, when ink adheres to the oscillating roller, the ink layer peels off due to the oscillating movement of the oscillating roller. There is. Due to the conflicting performance requirements as described above, the surface of the oscillating roller 3-4 is required to have appropriate ink adhesion. Therefore, the surface of the oscillating roller 3-4 has a surface roughness of 1.6 s as in the present invention.
It is desirable that the following smooth surface, and the surface material has water repellency, for example, the surface of the roller is made of a water repellent material such as fluorine-based rubber or silicon-based rubber,
Alternatively, a roller or the like having a surface coated with a fluorine-based or silicon-based water-repellent material is desirable. Of course,
It goes without saying that the selection of these materials depends on the properties of the ink.

Next, an ink magazine 3-1 for replenishing the ink.
Will be described. As shown in FIG. 2 (or FIG. 4),
At the lower part of the container 3-1-1 of the ink magazine 3-1 is a refill port 3-1 which is an outlet for the refill ink 3-1-4 to the outside.
As described above, the replenishing port 3-1-5 is provided downward so as to drop ink into the ink reservoir 3-2. Further, in order to push out the ink from the ink magazine 3-1, the container 3-1 of the ink magazine 3-1 is pushed.
1 includes a rotatable shaft 3-1-2 and a blade-shaped member as an ink pushing member 3-1-3 attached to the shaft. As described above, the ink storage unit 3-2 has an ink remaining amount detection sensor (not shown). When the remaining amount of ink becomes a certain level or less, the ink remaining amount detection sensor operates to notify the replenishment of the ink. When the remaining amount of ink is reduced and a replenishment command is issued, a driving force is transmitted from a drive transmission mechanism (not shown) to a rotatable shaft 3-1-2 provided in the ink magazine container. Of the ink pushing member 3-1-3 is rotated, and the ink 3-1-4 is rotated.
From the refill port 3-1-5 to the outside. The amount of ink pushed out by the pushing member 3-1-3 at this time varies depending on the rotation amount of the blade-shaped pushing member 3-1-3 and the amount of remaining ink in the container. Whether or not the ink is replenished in the reservoir 3-2 is determined by a microcomputer or the like of a control unit (not shown) based on whether or not there is an additional command from the ink remaining amount detection sensor again. Controlled.

Since the ink magazine 3-1 is used for replenishing the ink, the ink magazine 3-1 can be added when the ink in the container becomes empty. It has a structure that can be loaded. For this reason, a magazine guide (not shown) is provided on the unit 3-5 side of the developing device 3 as a guide for detaching the ink magazine 3-1. In the developing device, there is provided an electric detecting means for discriminating the presence or absence of the ink magazine 3-1 and whether or not the ink is of a proper color. Detecting means for detecting whether the remaining amount of ink or the ink is empty is provided as necessary, but these are not shown.

[0053]

As described above, in the printing apparatus according to the first aspect, a plurality of printing plate drums having a printing plate wound around the peripheral surface, and a developing device for supplying printing ink to each plate drum. Apparatus, an intermediate transfer device having a transfer material for transferring and receiving ink to be printed from each plate drum, a paper transfer device for transferring the ink transferred to the transfer material to printing paper, and printing on the paper transfer device Since a printing paper supply device for supplying paper and a cleaning device for cleaning the transfer material after printing are basically provided, and a heat-sensitive and water-repellent printing plate is used as the printing plate, a conventional offset printing machine is used. Thus, it is possible to provide a small, compact, and low-priced printing apparatus as compared with the above. In the printing device of the present invention, the developing device includes a developing roller that applies printing ink to a printing plate wound around a plate drum,
An ink reservoir for temporarily storing ink in the developing device and supplying ink to the developing roller; a blade for adjusting the ink supplied from the ink reservoir to the developing roller to an appropriate thickness; and a downstream of the blade. It is a small developing device mainly composed of a oscillating roller provided on the developing roller to level the ink on the developing roller and an ink magazine for replenishing the ink in the ink reservoir. Therefore, the configuration of the portion that supplies ink to the plate drum can be reduced in size, and a smaller and more compact printing apparatus that is optimal as a printing machine used in the OA field and the DTP field can be realized.

According to a second aspect of the present invention, in the developing device, a developing roller for applying printing ink to a printing plate wound around a plate drum, and ink is temporarily stored in the developing device and the ink is stored in the developing roller. An ink reservoir for supplying ink, a blade for adjusting the ink supplied from the ink reservoir to the developing roller to an appropriate thickness, a oscillating roller provided downstream of the blade to level the ink on the developing roller, An ink magazine for refilling the ink in the ink reservoir, provided in the unit, wherein the ink magazine is disposed above the ink reservoir, the ink reservoir is disposed above the upper half of the developing roller, and the blade Is disposed downstream of the ink reservoir when viewed from the ink flow direction, and the swing roller is disposed on the developing roller downstream of the blade when viewed from the ink flow direction. As a result, the components can be stored compactly in the unit, and the development device can be made smaller and simpler than the device configuration using multiple rollers used in conventional offset printing presses. This can contribute to downsizing and downsizing of the printing apparatus. Further, since the constituent members are compactly housed in the unit, it can be easily attached to and detached from the printing apparatus, and the developing apparatus can be easily replaced.

According to a third aspect of the present invention, in addition to the structure and effect of the second aspect, the blade is provided so as to be slidable on a side wall of a box forming an ink reservoir. In addition, the ink supplied to the developing roller from the ink reservoir is immediately averaged by being always disposed on the side wall on the downstream side of the box of the ink reservoir when viewed from the direction in which the developing ink flows on the developing roller. Thus, the ink layer having a uniform film thickness can be formed on the developing roller. Further, in the developing device according to the fourth aspect, the blade is slidable on a side wall of a box forming an ink reservoir so as to be pressed against the developing roller at a substantially central point in the longitudinal direction of the blade. With such holding, the blade can be uniformly pressed against the developing roller, and the ink film thickness can be controlled more uniformly.

In the developing device according to the fifth aspect, the blade is held in the shape and position of the blade so as to act as a counter with respect to the rotation direction of the developing roller. Ink can be scraped off, and the ink film thickness can be reliably controlled. According to a sixth aspect of the present invention, the blade has a sharp edge having a radius of curvature R of 0.1 (mm) or less, and the tip of a ridge line pressed by the developing roller has a sharp shape. Even in the case of printing ink having a high level, the excess ink on the developing roller can be scraped off, and the ink film thickness can be reliably controlled. In the developing device according to the seventh aspect, the blade has a wedge-shaped ridge pressed against the developing roller. The ink can be scraped off, and the ink film thickness can be reliably controlled. Further, in the developing device according to the present invention, since the blade is made of an elastic material, the tip of the blade is uniformly contacted with the developing roller by the elastic force, so that the ink film thickness is reliably controlled. be able to.

According to a ninth aspect of the present invention, in addition to the configuration and the effect of the second aspect, the ink reservoir is disposed on an upper half upper portion of the developing roller, and the ink reservoir may store the ink in a box shape. And the box-shaped ink reservoir is structured so that it can rotate so as to approach or avoid the developing roller, so that the amount of ink supplied from the ink reservoir to the developing roller can be increased. Can be controlled, and the print density can be changed. Claim 1
In addition to the configuration and effect according to any one of claims 2 to 9, in the developing device according to the present invention, the box body of the ink reservoir is provided with a seal member for sealing a gap with the developing roller on three side walls. Since the other side wall is provided with the blade, the gap between the ink reservoir and the developing roller is reliably sealed, and ink leakage can be prevented. In the developing device according to the eleventh aspect, a tenth aspect is provided.
In addition to the configuration and the effect of the above, the inlet on the side where the ink on the developing roller returns to the ink reservoir again is provided in the same direction as the ink flow direction on the developing roller, that is, the tailing of the ink with the developing roller. A seal member facing in the direction of the developing roller is provided, and a seal member compressed on the end surface of the developing roller or the upper surface of the developing roller is provided on both sides of the ink reservoir in the longitudinal direction of the developing roller. While preventing the ink from leaking from the reservoir, the recirculated ink that returns again by the rotation of the developing roller can be returned to the ink reservoir, and the seal members on both sides allow the ink reservoir to be connected to the developing roller. In addition, it is possible to prevent the leakage of ink even when approaching or avoiding.

According to a twelfth aspect of the present invention, in addition to the configuration and effect of any of the second to eleventh aspects, the ink magazine for replenishing the ink is provided substantially above the ink reservoir, and the ink magazine is provided. Is formed so that it is located almost above the ink reservoir, ink can be dropped from the ink magazine replenishment port to the ink reservoir, and ink can be easily replenished. A simple ink replenishing mechanism is not required, and the configuration of the developing device can be simplified. In the developing device according to the thirteenth aspect, in addition to the configuration and effect according to any one of the second to twelfth aspects, the oscillating roller is provided downstream of the blade when viewed from the ink flow direction, and is provided with Since the surface is a smooth surface having a mechanical surface roughness of 1.6 S or less, the ink film thickness on the developing roller, which has been made substantially uniform by the blade, can be further uniformed and uniform. The occurrence of (density unevenness) can be prevented. In the developing device according to the fourteenth aspect,
13. In addition to any one of the constitutions and effects of the thirteenth aspect, the oscillating roller is made of a water-repellent material whose surface material can appropriately control the adhesion to ink, or a roller coated with a water-repellent material. By this, it is possible to prevent the ink from excessively adhering to the swing roller and prevent the ink leveling performance from being impaired, so that the ink on the developing roller is always leveled uniformly. And uneven development (density unevenness) can be prevented.

As described above, according to the present invention, a basic structure of a printing apparatus using a heat-sensitive and water-repellent printing plate is provided, and a developing apparatus having a novel structure provided in the printing apparatus is provided. Therefore, it is possible to solve the conventional problems of downsizing, downsizing, and cost reduction of the printing apparatus. Further, according to the present invention, a developing device having a small and simple configuration can be provided, and the developing device can be manufactured at low cost because of the small and simple configuration. In addition, by using the developing device of the present invention, it is possible to switch to a developing device containing a special color ink capable of selective printing as a printing device particularly used for OA, and to achieve a compact and unit-exchangeable device. Provided printing device. Further, by using the developing device of the present invention, the density can be easily changed from the operation panel as in a copying machine and the density can be changed instantaneously. A usable printing device can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a configuration example of a developing device provided in the printing device illustrated in FIG. 1;

FIG. 3 is a perspective view of a main part showing a configuration example of a blade attachment portion of the developing device shown in FIG. 2;

FIG. 4 is a schematic configuration diagram showing another configuration example of a developing device provided in the printing device shown in FIG.

[Explanation of symbols]

 1: plate drum device 1-1; plate drum 1-2: heat-sensitive water-repellent printing plate 2: writing device 3: developing device 3-1: ink magazine 3-2: ink reservoir unit 3-2-1: box Body 3-2-3, 3-2-3 ': blade 3-3: developing roller 3-4: swing roller 4: transfer belt device (intermediate transfer device) 5: transfer roller device (paper transfer device) 6: Cleaning device 7: Printing paper supply device 8: Conveying device 9: Fixing device 10: Paper discharging device 11: Paper discharging receiving device S: Printing paper

Claims (14)

[Claims] 1. A printing plate drum having a printing plate wound around a peripheral surface thereof, a developing device for supplying a printing ink to each plate drum, and an ink to be printed from each plate drum being transferred and received. An intermediate transfer device having a transfer material, a paper transfer device for transferring the ink transferred to the transfer material to printing paper, a printing paper supply device for supplying printing paper to the paper transfer device, and the transfer material after printing is completed A printing device having a cleaning device as a basic configuration, wherein a heat-sensitive water-repellent printing plate is used as the printing plate, and the developing device is configured to print ink on a printing plate wound around a plate drum. Developing roller, an ink reservoir for temporarily storing ink in the developing device and supplying ink to the developing roller, and an ink supplied from the ink reservoir to the developing roller. And a blade to adjust the thickness to
A printing device characterized by being a small developing device mainly comprising a swing roller provided downstream of the blade to level ink on a developing roller and an ink magazine for replenishing the ink reservoir with ink. apparatus. 2. A developing device provided in a printing device according to claim 1, wherein said developing roller applies printing ink to a printing plate wound around a plate drum, and said ink is temporarily stored in said developing device. An ink reservoir for storing ink and supplying ink to the developing roller;
A blade for adjusting the ink supplied from the ink reservoir to the developing roller to an appropriate thickness, a swinging roller provided downstream of the blade to level the ink on the developing roller, and refilling the ink reservoir with ink An ink magazine is provided in the unit, the ink magazine is disposed above the ink reservoir, the ink reservoir is disposed above the upper half of the developing roller, and the blade is disposed as viewed from the ink flow direction. The developing device is arranged downstream of the ink reservoir, and the oscillating roller is arranged on a developing roller downstream of the blade when viewed from the ink flow direction. 3. The developing device according to claim 2, wherein the blade is provided so as to be slidable on a side wall of a box forming an ink reservoir, and the blade of the ink reservoir is provided with a blade. A developing device, wherein the developing device is always disposed on the side wall on the downstream side when viewed from the direction in which the developing ink flows on the developing roller. 4. The developing device according to claim 3, wherein said blade is provided on a side wall of a box forming an ink reservoir so as to be pressed against a developing roller at a point substantially at a central portion in a longitudinal direction of said blade. A developing device, which is held so as to be slidable. 5. A developing device according to claim 2, wherein said blade is held in the shape and position of said blade so as to act as a counter with respect to the rotation direction of said developing roller. Developing device. 6. A developing device according to claim 2, wherein said blade has a shape in which a tip of a ridge line pressed by said developing roller has a curvature radius R of at least 0.1.
(Mm) A developing device having a sharp shape of not more than (mm). 7. The developing device according to claim 2, wherein the blade has a wedge-shaped ridge pressed against the developing roller. 8. The developing device according to claim 2, wherein said blade is made of an elastic material. 9. The developing device according to claim 2, wherein the ink reservoir is disposed above an upper half of the developing roller.
The developing device is characterized in that the ink can be stored in a box-like form, and that the box-like ink storing portion can rotate so as to approach or avoid the developing roller. apparatus. 10. The developing device according to claim 2, wherein the box of the ink reservoir is provided with a seal member for sealing a gap with the developing roller on three side walls. A developing device provided with the blade on a side wall of the developing device. 11. The developing device according to claim 10, wherein the inlet on the side where the ink on the developing roller returns to the ink reservoir again is in the same direction as the flow direction of the ink on the developing roller, that is, the developing device. A seal member facing the direction of tailing with respect to the roller is provided.
A developing device, wherein a seal member compressed on an end surface of the developing roller or on an upper surface of the developing roller is provided on both sides in a longitudinal direction of the developing roller. 12. The developing device according to claim 2, wherein the ink magazine for ink replenishment is provided substantially above an ink reservoir, and a replenishing port of the ink magazine is provided in the ink reservoir. A developing device, which is formed so as to be substantially at the upper part of the developing device. 13. The developing device according to claim 2, wherein the oscillating roller is provided downstream of the blade when viewed from the direction of ink flow, and the surface of the oscillating roller is mechanical. A developing device having a smooth surface having a surface roughness of 1.6 S or less. 14. The developing device according to claim 2, wherein the oscillating roller is made of a water-repellent material whose surface material can appropriately control the adhesion to ink. Alternatively, the developing device is a roller coated with a water-repellent material.