JP5521388B2 - Plate cylinder cleaning device - Google Patents

Description

  The present invention relates to a plate cylinder cleaning apparatus for a gravure rotary printing press, and more particularly to a plate cylinder cleaning apparatus capable of simultaneously cleaning a plate cylinder and a finisher roll when a finisher roll is used in combination.

In a gravure rotary printing press, a plate cylinder made by engraving concave cells on the outer peripheral surface is set in a printing unit, ink is attached to the plate cylinder via a finisher roll, and the doctor is pressed against the plate cylinder. Then, excess ink adhering to the portion other than the concave cell portion is scraped off, and printing is performed by transferring the ink in the concave cell to the passing substrate between the pressure cylinder pressed against the plate cylinder. After printing, the ink is dried by a dryer and introduced into the next printing unit.
Currently, it is common to attach ink to the plate cylinder using a finisher roll with high ink adhesion performance to cope with high speeds, but depending on the printing machine, there is also a mechanism of structure that directly attaches ink to the plate cylinder is there.
On the other hand, the plate cylinder that has finished printing is removed, and the next plate cylinder to be printed is set in the printing unit. At that time, it is necessary to wash the ink adhering to the plate cylinder after printing. As a method for cleaning the plate cylinder, an operation of wiping off ink adhering to the plate cylinder with a waste impregnated with a cleaning liquid while rotating the plate cylinder at a low speed is performed.

  However, such cleaning methods are problematic in terms of the worker's working environment, and more and more small-lot lots are being developed, the frequency of plate cylinder replacement being increased, and productivity reduction due to increased setup time. Yes. Therefore, automation of the plate cylinder cleaning work is required as a means for improving the worker's working environment, further reducing the setup time, and improving productivity.

Further, as a prior art, there is known a plate cylinder automatic cleaning device for a gravure printing machine capable of automatically cleaning a plate cylinder and a finisher roll when a finisher roll is used in combination (see Patent Document 1).
However, since this cleaning method keeps the cleaning liquid flowing during the cleaning, the amount of the cleaning liquid used is large, and the plate cylinder and the finisher roll are not opened and closed during the cleaning. is there.
Also known is a cleaning method and apparatus for a printing press having a printing plate cylinder for transferring ink to a printing sheet made of paper or plastic sheet, and a doctor for removing unnecessary ink adhering to the printing plate cylinder. (See Patent Document 2). Although this cleaning method and apparatus achieves substantially the same cleaning effect as the cleaning apparatus according to the present invention, there is a problem that it takes time to set up the ink after the plate cleaning.

JP-A-8-244213 JP-A-10-309800

  The present invention has been made in order to solve the above-described problems. The plate cylinder and the finisher roll after printing by the gravure rotary printing machine can be cleaned with a small amount of cleaning liquid, and the plate cylinder and the finisher. It is an object of the present invention to provide a plate cylinder cleaning apparatus that can reduce the setup time required for cleaning a roll and that can shorten the time required for ink removal after cleaning.

In order to achieve the above object, an invention according to claim 1 includes an ink pan that can be moved up and down, a plate cylinder disposed above the ink pan and driven to rotate about a horizontal axis, and the plate cylinder on an outer peripheral surface of the plate cylinder. And a finisher roll that is detachable from the lower side while maintaining a parallel state with the ink pan, and transfers the ink of the ink pan to the outer peripheral surface of the plate cylinder, and is provided detachably on the outer peripheral surface of the plate cylinder. A plate cylinder cleaning device of a printing unit having a doctor that scrapes off excess ink adhering to the peripheral surface of the plate cylinder, the peripheral surface facing obliquely upward of the plate cylinder when cleaning the plate cylinder and the finisher roll A cleaning / drying head that discharges cleaning liquid and blows drying air onto the peripheral surface of the plate cylinder after cleaning the plate cylinder and the finisher roll, and the cleaning / drying head From The cleaning liquid or drying air to be discharged can be separated into a supporting means that is detachably supported on the printing unit so that the cleaning liquid or drying air is discharged toward a circumferential surface facing obliquely upward of the plate cylinder, and the cleaning / drying head. A cleaning liquid supply means for supplying a cleaning liquid to the cleaning / drying head connected using water head pressure, and an air for detachably connected to the cleaning / drying head connected to the cleaning / drying head. Supply means, and the cleaning liquid supply means is installed at a position higher than the position of the cleaning / drying head supported by the printing unit via the support means, and has a water level at which a certain range of water head pressure is maintained. A cleaning liquid tank for storing cleaning liquid, and a supply pump for supplying a solvent for adjusting the viscosity of ink used in the printing unit from the solvent tank to the cleaning liquid tank as a cleaning liquid Characterized by comprising a timer with an automatic control valve for controlling the flow rate of the cleaning liquid flowing into said cleaning and drying head from the cleaning liquid tank is provided in the flow path between the washing and drying head and the cleaning liquid tank.

According to a second aspect of the present invention, there is provided the plate cylinder cleaning apparatus according to the first aspect, wherein the cleaning / drying head is separated from the cleaning liquid supply means and the air supply means and is removed from the support means. A storage place for storage is provided in the printing unit.
According to a third aspect of the present invention, in the plate cylinder cleaning apparatus according to the first or second aspect, the cleaning / drying head includes a tube member extending in a longitudinal direction of the plate cylinder, and the plate cylinder of the tube member. A plurality of nozzle holes provided in communication with the inside of the pipe member along a longitudinal direction of the pipe member at a location facing the peripheral surface, and a housing that accommodates the pipe member and is detachably engaged with the support means It is characterized by providing.

According to a fourth aspect of the present invention, in the plate cylinder cleaning apparatus according to any one of the first to third aspects, the air supply means includes an air supply source, a flow of the air supply source, and the cleaning / drying head. The air pressure provided to the cleaning / drying head from the air supply source provided in the path is changed to an air pressure at which the cleaning liquid remaining in the cleaning / drying head and the cleaning liquid adhering to the peripheral surface of the plate cylinder are not scattered. A first air pressure adjustment valve that is adjusted and supplied to the cleaning / drying head, and the cleaning liquid in the cleaning / drying head and the plate cylinder peripheral surface by the air adjusted by the first air pressure adjustment valve After the cleaning liquid is removed, the air pressure supplied from the air supply source to the cleaning / drying head is adjusted to an air pressure higher than the pressure by the first air pressure control valve, and sprayed onto the circumferential surface of the plate cylinder And a second air pressure control valve.

The invention of claim 5 is the plate cylinder cleaning device according to any one of claims 1 to 4 , wherein the ink pan is dropped from the plate cylinder and the finisher roll when the plate cylinder and the finisher roll are cleaned. The ink pan is tilted from a horizontal position where ink can be stored to a tilt position where the cleaning liquid stored in the ink pan and ink remaining in the ink pan can be discharged to a pre-installed ink can. It is provided as follows.
A sixth aspect of the present invention is the plate cylinder cleaning apparatus according to any one of the first to fifth aspects, wherein the finisher roll swings so that the finisher roll is separated from and contacted with a peripheral surface of the plate cylinder. And the swinging means includes a positioning mechanism for adjusting the approach position of the finisher roll with respect to the peripheral surface of the plate cylinder.

  According to the plate cylinder cleaning apparatus of the present invention, the cleaning / drying head that can be attached to and detached from the printing unit after the printing is finished is set to face the circumferential surface facing diagonally upward of the plate cylinder, The rotation speed of the finisher roll is changed to the cleaning speed, the ink pan is lowered, the peripheral surface of the finisher roll is separated from the ink level in the ink pan, and the doctor is applied to the peripheral surface of the plate cylinder. The plate cylinder and the fan are repeatedly brought into contact with the peripheral surface of the plate cylinder while the fixed amount of the cleaning liquid is discharged from the cleaning liquid supply means to the peripheral surface of the plate cylinder through the cleaning / drying head while being in contact. After cleaning the plate cylinder and the finisher roll, drying air is blown from the air supply means to the circumferential surface of the plate cylinder through the cleaning / drying head to clean the plate cylinder and the fan cylinder. Since the shear roll is dried, the plate cylinder and the finisher roll after printing can be cleaned with a small amount of cleaning liquid, and the setup time required for cleaning the plate cylinder and the finisher roll can be reduced. The setup time required for cleaning the entire gravure printing apparatus can be shortened and productivity can be improved. In addition, since the cleaning / drying head can be attached to and detached from the printing unit, the cleaning / drying head can be detached from the printing unit and stored in a storage place during the printing operation of the printing unit. Accordingly, it is possible to prevent the cleaning / drying head from interfering with the printing operation of the printing unit and the work around the printing unit.

Further, according to the present invention, the ink pan is tilted from the horizontal position to the tilting position where the cleaning liquid accumulated in the ink pan and the ink remaining in the ink pan can be discharged, so the ink and cleaning liquid in the ink pan are automatically removed. In addition, it is possible to reduce the contamination of the operator with ink and cleaning liquid, and to improve the working environment.
In addition, according to the present invention, it is possible to select the cleaning method for each level such as “character”, “picture”, and “solid” by setting the number of times of cleaning for the plate cylinder and the finisher roll. Effective cleaning means can be selected for each, and the cleaning liquid can be used effectively.

It is the schematic which shows the whole structure of the printing unit which comprises the plate cylinder washing | cleaning apparatus concerning this invention. 1 is a schematic side view showing a configuration of a printing unit including a plate cylinder cleaning apparatus according to the present invention. It is a perspective view which shows the structure of the head for washing | cleaning / drying in this Embodiment, and its support mechanism. It is a block diagram which shows the control system of the plate cylinder washing | cleaning apparatus concerning this invention. It is a flowchart which shows the procedure of washing | cleaning operation of the plate cylinder washing | cleaning apparatus in this Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.
As shown in FIGS. 1 and 2, the printing unit 100 including the plate cylinder cleaning apparatus according to the present embodiment includes a plate cylinder 1, a finisher roll 2, an ink pan 3, a doctor 4, and an impression cylinder 5.
The plate cylinder 1 is arranged above the ink pan 3 and is composed of a cylindrical body in which cells made of fine concave dents are engraved on the outer peripheral surface thereof, and a horizontal axis 1a provided at the center of the cylindrical body. The frame 101 of the printing unit 100 is rotatably supported. The plate cylinder 1 is rotationally driven by driving means 51 (see FIG. 4) including an electric motor.
The finisher roll 2 transfers the ink of the ink pan 3 to the outer peripheral surface of the plate cylinder 1, and the finisher roll 2 faces the peripheral surface of the plate cylinder 1 facing obliquely downward, and the plate cylinder 1. In parallel with each other and on the circumferential surface of the plate cylinder 1 so as to be separable from below. The finisher roll 2 includes swinging means 52 (see FIG. 4) made of an air cylinder or the like in order to bring the finisher roll 2 into and out of contact with the peripheral surface of the plate cylinder 1. The swinging means 52 includes a positioning mechanism that adjusts the approach position of the finisher roll 2 with respect to the peripheral surface of the plate cylinder 1. The swinging means 52 is incorporated in the frame body 101 of the printing unit 100. Reference numeral 8 shown in FIG. 1 denotes an ink can that discharges the cleaning liquid accumulated in the ink pan 3 and the ink remaining in the ink pan 3.

The ink pan 3 stores ink used for printing by the printing unit 100, and is placed on a lifting platform 31 a of a lifting mechanism 31 (corresponding to lifting means described in the claims). The ink pan 3 can be tilted from the horizontal position shown by the solid line in FIG. 2 to the tilted position (the direction indicated by the arrow A in FIG. 2) as indicated by the solid line in FIG. So that it is supported. In order to tilt the ink pan 3 from the horizontal position to the tilted position or return the ink pan 3 from the tilted position to the horizontal position, the ink pan 3 is configured to be tilted by tilting means 53 (see FIG. 4) including an air cylinder. ing.
The doctor 4 leaves the ink in the cells and scrapes only the ink adhering to the peripheral surface of the plate cylinder 1. The doctor 4 faces the peripheral surface of the plate cylinder 1 opposite to the arrangement side of the finisher roll 2. It is arranged in parallel with the barrel 1. The doctor 4 is swingably supported by the frame body 101 of the printing unit 100 with the horizontal shaft 4b as a fulcrum so that the doctor blade 4a provided on the doctor 4 can be separated from the upper surface of the plate cylinder 1 from above. Has been. Further, in order to bring the doctor blade 4a into contact with the peripheral surface of the plate cylinder 1, the doctor 4 is configured to be moved in the above-mentioned separating direction by a contact means 54 (see FIG. 4) comprising an air cylinder or the like. Yes.

As shown in FIG. 1, the plate cylinder cleaning apparatus of the printing unit 100 includes a cleaning / drying head 6, a cleaning liquid supply means 120, an air supply means 130, and the like.
When the printing cylinder 1 and the finisher roll 2 are washed after printing, the cleaning / drying head 6 discharges the cleaning liquid to the circumferential surface facing obliquely upward of the printing cylinder 1 and the printing cylinder 1 and the finisher. After cleaning the roll 2, drying air is blown toward the peripheral surface of the plate cylinder. The cleaning / drying head 6 is disposed in parallel to the plate cylinder 1 so as to face the circumferential surface of the plate cylinder 1 facing obliquely upward, and is provided on a frame 101 of the printing unit 100 (claims). 6a) (which corresponds to the supporting means described in the above).
Further, as shown in FIG. 3, the cleaning / drying head 6 includes a tube member 61 extending in the longitudinal direction of the plate cylinder 1 and a tube member 61 at a location facing the peripheral surface of the plate cylinder 1 of the tube member 61. A plurality of nozzle holes 62 provided in communication with the inside of the tube member 61 along the longitudinal direction thereof, and a housing 63 that accommodates the tube member 61 and is detachably engaged with the support member 6a. During the printing operation of the printing unit 100, the cleaning / drying head 6 is separated from the cleaning liquid supply unit 120 and the air supply unit 130, and is detached from the support member 6 a and provided on the frame body 101 of the printing unit 10. It is configured to be stored in the storage location 102.

The cleaning liquid supply means 120 supplies the cleaning liquid to the cleaning / drying head 6 at a hydraulic head pressure. As shown in FIG. 1, the cleaning liquid supply means 120 includes an automatic switching valve 10 with a timer, a cleaning liquid tank 13, a level sensor 14, a liquid supply pump 15, a solvent tank 16, and the like.
The cleaning liquid tank 13 is installed at a position higher than the position of the cleaning / drying head 1 supported by the frame body 101 of the printing unit 100 via the support member 6a, and the cleaning liquid is supplied to a water level at which a certain range of head pressure is maintained. It is a thing to accumulate.
The level sensor 14 is provided in the cleaning liquid tank 13 and detects an upper limit level and a lower limit level of the cleaning liquid stored in the cleaning liquid tank 13.
The liquid supply pump 15 supplies a solvent for adjusting the viscosity of the ink used in the printing unit 100 from the solvent tank 16 to the cleaning liquid tank 13 as a cleaning liquid. The liquid supply pump 15 is detected by the level sensor 14. The operation is stopped and controlled on the basis of the signal, and the upper limit level and the lower limit level of the cleaning liquid stored in the cleaning liquid tank 13 are controlled so that the above-mentioned fixed range of water head pressure is maintained. The cleaning liquid overflowed from the cleaning liquid tank 13 is returned to the solvent tank 16 through the pipe 13a.
In addition, one end of a supply hose 13b that also supplies cleaning liquid and drying air is connected to the bottom of the cleaning liquid tank 13, and the other end of the supply hose 13b is connected to a cleaning / drying head via a detachable valve 9. 6 is connected to the supply port 61a of the tube member 61.
The automatic switching valve 10 with a timer controls the total flow rate of the cleaning liquid flowing from the cleaning liquid tank 13 to the cleaning / drying head 6 according to time, and is interposed in the middle of the supply hose 13b.

The air supply means 130 supplies drying air to the cleaning / drying head 6 and includes an air supply source 12, a first air pressure adjustment valve 11a, a second air pressure adjustment valve 11b, and the like.
The first air pressure control valve 11a retains the air pressure supplied from the air supply source 12 to the cleaning / drying head 6 in the supply hose 13b on the cleaning / drying head 6 side from the automatic switching valve 10 with a timer. The pressure is adjusted so that the cleaning liquid remaining in the pipe member 61 of the cleaning / drying head 6 and the cleaning liquid adhering to the peripheral surface of the plate cylinder 1 are not scattered, and between the air supply source 12 and the supply hose 13b. Are connected in series to a pipe 12a.
The second air pressure adjusting valve 11b adjusts the air pressure supplied from the air supply source 12 to the cleaning / drying head 6 to a pressure higher than the air pressure by the first air pressure adjusting valve 11a. This is sprayed on the peripheral surface, and is connected in series to a pipe 12b connecting the air supply source 12 and the supply hose 13b.
In FIG. 1, reference numeral 17 denotes an ink viscosity adjusting unit that adjusts the viscosity of ink used in the printing unit 100, and a solvent is supplied to the ink viscosity adjusting unit 17 from the solvent tank 16 as necessary. It has become. The ink whose viscosity is adjusted by the ink viscosity adjusting unit 17 is supplied to the printing unit 100 from the ink supply port 17a.

Next, the configuration of FIG. 4 will be described.
In FIG. 4, a control unit 56 (corresponding to the control means described in the claims) controls and manages the entire plate cylinder cleaning device of the printing unit 100, and stores a control program necessary for plate cylinder cleaning. And a CPU for controlling the plate cylinder cleaning device by executing processing necessary for the plate cylinder cleaning based on the program data of the memory.
The control unit 56 is connected to an input unit 57 for inputting data necessary for plate cylinder cleaning and an interface 58 for inputting / outputting data to / from the outside. In addition, the interface 58 has a lifting mechanism 31, a driving means 51, a swinging means 52, a tilting means 53, a contact means 54, via respective drive control units 311, 511, 521, 531, 541, 10 a, 111. An automatic switching valve 10 with a timer and first and second air pressure control valves 11a and 11b are connected to each other.

Next, the plate cylinder cleaning operation of the printing unit by the plate cylinder cleaning apparatus according to the present embodiment will be described with reference to FIG.
When printing of the printing unit is completed (step S1), the plate cylinder 1 and the finisher roll 2 are in an idling operation state. Here, as preparation for plate cylinder cleaning, first, a printing unit that performs plate cylinder cleaning is selected by the input unit 57, and a cleaning level (cleaning content), that is, the number of times of cleaning the plate cylinder 1 is set (step S2). Thereafter, the cleaning / drying head 6 is set on the frame 101 of the printing unit 100, and the other end of the supply hose 13 b is connected to the tube member 61 of the cleaning / drying head 6 via the valve 9.
Next, the input unit 57 is operated to input a plate cylinder cleaning command. Receiving this command, the control unit 56 controls the selected printing unit to enter the plate cylinder cleaning operation. Here, the plate cylinder 1 and the finisher roll 2 performing the idling operation are shifted to the plate cylinder cleaning speed by controlling the driving means 51 based on the control signal from the control unit 56 (step S4). The ink viscosity adjusting unit 17 is stopped (step S5), and the circulation of the ink is stopped. Thereafter, the ink pan 3 is lowered by controlling the lifting mechanism 31 based on the control signal from the control unit 56 (step S6). Thereby, the finisher roll 2 immersed in the ink filled in the ink pan 3 is separated from the ink.
Next, by driving the swinging means 52 based on a control signal from the control unit 56, the finisher roll 2 is once separated from the plate cylinder 1, and the ink accumulated between the two is transferred to the ink pan 3. Then, the finisher roll 2 is brought into contact with the plate cylinder 1 again. That is, the finisher roll 2 is swung by the swinging means 52 so that the plate cylinder 1 and the finisher roll 2 are separated from each other (step S7).

Next, in a state where the finisher roll 2 is in contact with the plate cylinder 1, the automatic switching valve 10 with a timer is opened for a certain period of time based on a control signal from the control unit 56, whereby a certain amount of the washing liquid is washed. From the tank 13 through the automatic switching valve 10 with a timer, the nozzle hole 62 of the cleaning / drying head 6 discharges toward the peripheral surface of the plate cylinder 1 to start cleaning the plate cylinder 1 and the finisher roll 2 (step). S8). Here, the liquid level of the cleaning liquid stored in the cleaning liquid tank 13 is detected by the level sensor 14, and when the liquid level reaches the lower limit, the liquid supply pump 15 is activated to remove the cleaning liquid from the solvent tank 16 to the cleaning liquid tank. The cleaning liquid is replenished so that the head pressure applied to the cleaning / drying head 6 is maintained within a certain range. When the liquid level reaches the upper limit, the liquid supply pump 15 is stopped based on a signal from the level sensor 14 that detects this.
Then, by driving the swinging means 52 based on a control signal from the control unit 56 after a certain time, the finisher roll 2 is once separated from the plate cylinder 1 and the plate cylinder 1 and the finisher roll 2 are separated. The cleaning liquid accumulated between the two is dropped onto the ink pan 3, and then the finisher roll 2 is brought into contact with the plate cylinder 1 again. That is, the finisher roll 2 is swung by the swinging means 52 so that the plate cylinder 1 and the finisher roll 2 are separated from each other (step S9). Here, if the number of times of cleaning is set, the processes of step S8 and step S9 are repeated for the set number of times.

When the cleaning of the plate cylinder 1 and the finisher roll 2 with the cleaning liquid is finished, the drying process of the plate cylinder 1 and the finisher roll 2 by air blow is executed (step S10).
In the drying process, first, based on a control signal from the control unit 56, the first air pressure control valve 11a is opened, and the air pressure supplied from the air supply source 12 to the cleaning / drying head 6 is supplied. The cleaning liquid remaining in the hose 13b, the cleaning liquid remaining in the tube member 61 of the cleaning / drying head 6 and the cleaning liquid adhering to the peripheral surface of the plate cylinder 1 are adjusted to a low air pressure and a small flow rate so as not to be scattered. Then, this low pressure air is caused to flow through the supply hose 13b and the pipe member 61 of the cleaning / drying head 6 to form droplets from the nozzle holes 62 without scattering the cleaning liquid remaining in the inside of the ink pan 3. Let fall. Thereby, the cleaning liquid remaining inside these is removed. At the same time, a low pressure and a low flow rate of air blown from the nozzle hole 62 are blown onto the peripheral surface of the plate cylinder 1, so that the cleaning liquid adhering to the peripheral surface of the plate cylinder 1 is not scattered and the periphery of the plate cylinder 1. Dropped from the surface into the ink pan 3.
Then, based on the control signal from the control part 56, the 1st air pressure control valve 11a is closed, and the 2nd air pressure control valve 11b is opened. As a result, air having a flow rate higher than the air pressure set by the first air pressure control valve 11a is supplied from the air supply source 12 to the cleaning / drying head 6 through the second air pressure control valve 11b. The high-pressure air is blown from the nozzle holes 62 of the cleaning / drying head 6 to the peripheral surface of the plate cylinder 1. As a result, the cleaning liquid remaining on the peripheral surface of the plate cylinder 1 and the peripheral surface of the finisher roll 2 rotating together is quickly vaporized and dried.

When the cleaning and drying processes of the plate cylinder 1 and the finisher roll 2 are completed, the driving unit 51 is controlled to stop based on the control signal from the control unit 56, and the idling operation of the plate cylinder 1 and the finisher roll 2 is stopped. (Step S11). Thereafter, the swinging means 52 is stopped based on the control signal from the control unit 56, and the finisher roll 2 is separated from the plate cylinder 1 (step S12). Thereafter, the contact means 54 is operated based on a control signal from the control unit 56, thereby separating the doctor 4 pressed against the plate cylinder 1 from the peripheral surface of the plate cylinder 1. Thereby, the automatic plate cylinder cleaning of the printing unit is completed.
Here, when the ink needs to be replaced, the tilting means 53 is operated based on a control signal from the control unit 56. Thus, when the ink pan 3 is tilted from the horizontal position shown by the solid line in FIG. 2 in the direction shown by the arrow A in FIG. 2, the ink remaining in the ink pan 3 and the cleaning of the plate cylinder 1 and the finisher roll 2 are cleaned. The cleaning liquid collected in the ink pan 3 is discharged to the ink can 8 as the remaining meat.
During the printing operation of the printing unit 100, the cleaning / drying head 6 is removed from the support member 6 a and stored in the frame body 101 storage location 102 of the printing unit 10.

  According to the present embodiment, the cleaning / drying head 6 that can be attached to and detached from the frame body 101 of the printing unit 100 after the printing is finished is set so as to face the circumferential surface that faces obliquely upward of the plate cylinder 1, At the start of cleaning, the rotational speed of the plate cylinder 1 and the finisher roll 2 is changed to the cleaning speed, and the ink pan 3 is lowered to separate the peripheral surface of the finisher roll 2 from the ink level in the ink pan 3. Then, while the doctor 4 is in contact with the peripheral surface of the plate cylinder 1, a predetermined amount of cleaning liquid is discharged from the cleaning liquid supply means 120 to the peripheral surface of the plate cylinder 1 through the cleaning / drying head 6. Is repeatedly brought into and out of contact with the peripheral surface of the plate cylinder 1 to clean the plate cylinder 1 and the finisher roll 2, and after cleaning the plate cylinder 1 and the finisher roll 2, drying air is supplied from the air supply means 130. Wash Since the plate cylinder 1 and the finisher roll 2 are dried by spraying the peripheral surface of the plate cylinder 1 through the head 6 for drying, the plate cylinder 1 and the finisher roll 2 after the printing is completed with a small amount of cleaning liquid. Cleaning can be performed, and the setup time required for cleaning the plate cylinder 1 and the finisher roll 2 can be reduced. Thereby, the setup time required for cleaning the entire gravure printing apparatus is shortened, and productivity can be improved. In addition, since the cleaning / drying head 6 can be attached to and detached from the frame 101 of the printing unit 100, the cleaning / drying head 6 can be detached from the printing unit and stored in a storage place during the printing operation of the printing unit. Accordingly, it is possible to prevent the cleaning / drying head 6 from interfering with the printing operation of the printing unit and the work around the printing unit.

In addition, according to the present embodiment, the ink pan 3 is tilted from a horizontal position to a tilting position where the cleaning liquid accumulated in the ink pan 3 and the ink remaining in the ink pan can be discharged. Can be automatically removed, and it is possible to reduce the contamination of the operator with ink and cleaning liquid, and to improve the working environment.
In addition, according to the present embodiment, it is possible to select the cleaning method for each level such as `` character '', `` pattern '', `` solid '', etc. by enabling the number of cleanings for the plate cylinder and the finisher roll to be set. An effective cleaning means can be selected for each printing unit, and the cleaning liquid can be effectively used.

  In addition, although the case where the plate cylinder cleaning method and the plate cylinder cleaning apparatus according to the present invention are applied to a single color printing unit has been described, the present invention is not limited thereto, and may be applied to a plurality of printing units having different colors. Can do. In this case, a main control unit that controls the control unit of each printing unit is provided, and the main control unit can set the cleaning level of each color printing unit, and each color printing unit can be cleaned at once. In addition to reducing the setup time of the printing unit, productivity is expected to improve. In addition, since the work can be automatically advanced only by an instruction from the main control unit, the work load on the worker can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Plate cylinder, 2 ... Furnisher roll, 3 ... Ink pan, 4 ... Doctor, 5 ... Impression cylinder, 6 ... Cleaning / drying head, 8 ... Ink can, 9 ... Valve, DESCRIPTION OF SYMBOLS 10 ... Automatic switching valve with a timer, 11a ... 1st air pressure control valve, 11b ... 2nd air pressure control valve, 12 ... Air supply source, 13 ... Cleaning liquid tank, 14 ... Level sensor, DESCRIPTION OF SYMBOLS 15 ... Supply pump, 16 ... Solvent tank, 17 ... Ink viscosity adjustment part, 56 ... Control part, 57 ... Input part, 58 ... Interface, 31 ... Lifting mechanism, 51 ... Driving means, 52... Swing means 53. Inclination means 54 54 Contact means 61 Pipe member 62 62 Nozzle hole 63 Housing 100 100 Printing unit 102 Storage location 120 ... Cleaning liquid supply means, 130 ... Air supply Stage.

Claims (6)

An ink pan that can be raised and lowered, a plate cylinder that is disposed above the ink pan and is driven to rotate about a horizontal axis, and is provided on the outer peripheral surface of the plate cylinder so as to be detachable from below while maintaining a parallel state with the plate cylinder. A finisher roll for transferring ink of the ink pan to the outer peripheral surface of the plate cylinder, and a doctor that is detachably attached to the outer peripheral surface of the plate cylinder and scrapes off excess ink adhering to the peripheral surface of the plate cylinder. A plate cylinder cleaning device for a printing unit having:
When cleaning the plate cylinder and the finisher roll, the cleaning liquid is discharged to a circumferential surface facing obliquely upward of the plate cylinder, and drying air is supplied to the peripheral surface of the plate cylinder after cleaning the plate cylinder and the finisher roll. A cleaning / drying head to spray
The cleaning / drying head is detachably supported on the printing unit so that the cleaning liquid or drying air discharged from the cleaning / drying head is discharged toward a circumferential surface facing obliquely above the plate cylinder. Supporting means for
A cleaning liquid supply means that is detachably connected to the cleaning / drying head, and supplies the cleaning liquid to the cleaning / drying head using a hydraulic head pressure;
An air supply means connected to the cleaning / drying head in a separable manner and supplying drying air to the cleaning / drying head ;
The cleaning liquid supply means is installed at a position higher than the position of the cleaning / drying head supported by the printing unit via the support means and stores the cleaning liquid at a water level at which a certain range of head pressure is maintained. A supply pump for supplying a solvent for adjusting the viscosity of the ink used in the printing unit as a cleaning liquid from a solvent tank to the cleaning liquid tank; and a flow path between the cleaning liquid tank and the cleaning / drying head. An automatic switching valve with a timer for controlling the flow rate of the cleaning liquid flowing from the cleaning liquid tank into the cleaning / drying head,
A plate cylinder cleaning apparatus.   The printing unit is provided with a storage place for storing the cleaning / drying head detached from the support means by separating the cleaning / drying head from the cleaning liquid supply means and the air supply means. The plate cylinder cleaning apparatus according to claim 1.   The cleaning / drying head includes a tube member extending in a longitudinal direction of the plate cylinder, and a portion of the tube member facing the peripheral surface of the plate cylinder along the longitudinal direction of the tube member. The plate cylinder cleaning apparatus according to claim 1, further comprising a plurality of nozzle holes provided in communication with each other and a housing that accommodates the tube member and is detachably engaged with the support means. The air supply means is provided in a flow path between an air supply source and the air supply source and the cleaning / drying head, and supplies air pressure supplied from the air supply source to the cleaning / drying head. A first air pressure adjusting valve that adjusts the air pressure so that the cleaning liquid remaining in the drying head and the cleaning liquid adhering to the peripheral surface of the plate cylinder are not scattered and is supplied to the cleaning / drying head; The air pressure supplied from the air supply source to the cleaning / drying head after the cleaning liquid in the cleaning / drying head and the cleaning liquid on the peripheral surface of the plate cylinder are removed by air adjusted by an air pressure control valve The air pressure control valve according to any one of claims 1 to 3, further comprising a second air pressure control valve that adjusts an air pressure higher than a pressure by the first air pressure control valve and sprays the air pressure on the peripheral surface of the plate cylinder. 2. A plate cylinder cleaning apparatus according to item 1. The ink pan is used as a receiving pan that receives a cleaning liquid dripping from the plate cylinder and the finisher roll when the plate cylinder and the finisher roll are cleaned. The plate cylinder according to any one of claims 1 to 4, wherein the plate cylinder is provided so as to tilt to a tilting position where the cleaning liquid and the ink remaining in the ink pan can be discharged to an ink can provided in advance. Cleaning device. The finisher roll includes a swinging means for separating and contacting the finisher roll with the peripheral surface of the plate cylinder, and the swinging means is a position where the finisher roll is close to the peripheral surface of the plate cylinder. plate cylinder cleaning device according to any one of claims 1-5, characterized in that it is configured to include a positioning mechanism for adjusting the.

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