JPH0410423B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a method for applying varnish to the printed surface of paper after printing by providing a varnishing device between a printing unit and a paper discharge device of a rotary printing press or in an independent varnishing machine. This invention relates to a printed matter varnishing device.

[Conventional technology]

The printed surface of paper printed with a rotary printing machine is prone to staining in subsequent processes because the ink dries slowly, and in the case of sheet-fed paper, set-off occurs when stacking discharged sheets, so this can be prevented. In order to do this, a drying device is installed in the conveyance path of the printed paper, or a spray powder is applied at this location. However, drying equipment requires large-scale equipment, and dust particles can make the paper rough and lose its luster, or cause problems when reprinting, so as an alternative, varnish can be applied to the surface of the printed paper. This is mainly done to prevent stains and give gloss to paper surfaces, for example, for printed matter that requires beauty, such as book covers, catalogs, and pamphlets.

This type of varnishing equipment is sometimes installed as an independent varnishing machine, but it is not efficient due to the direct work time and also the transfer of paper, so in recent years it has been installed on the output paper conveyance path of the printing machine. Generally, it is installed within the Its structure includes a roller group arranged in the same way as a water supply device that supplies water to the surface of a printing plate mounted on the plate cylinder of a printing device, and the varnish stored in the varnish tank is passed through this roller group. In most cases, the varnish is supplied to the surface of the blanket cylinder, and the varnish is transferred from the blanket cylinder to the paper passing between the blanket cylinder and the impression cylinder.

The varnish used in this type of varnishing device is a water-based varnish that dries quickly, and when applied to paper, it dries quickly and has the function of protecting the printed paper surface. If the rollers inside were stopped even for a short time, the thin varnish on the circumferential surface of the rollers would dry, making subsequent processing extremely troublesome.
In this case, conventionally the rollers and varnishing boat were washed by hand, but in recent years, roller cleaning devices have been added to varnishing equipment, and while the printing press is stopped, the varnishing roller is rotated and a cleaning solution is applied to it while a doctor knife is used. Wiping is done with etc.

However, with conventional equipment, it is not possible to wash the varnishing boat at the same time, and this must be done separately by hand. Also, it takes time to wash the hose after washing the rollers, resulting in poor work efficiency. Satisfactory performance could not be expected in terms of dissolution.

[Summary of the invention]

The present invention has been made in view of the above points, and a tank consisting of a varnish tank and a solution tank each equipped with a pump and a heating means, and a varnish tank in the varnishing section are connected to a supply flow tank equipped with a valve. In addition to providing a solution supply channel that connects the solution tank to multiple locations in the roller cleaning section, the supply of varnish to the varnish boat and the varnishing process are performed by operating the pump and switching the valves. To provide a printed matter varnishing device that improves work efficiency and reduces labor by being configured to selectively perform boat cleaning. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

This embodiment shows an example in which the present invention is applied to a four-color sheet-fed rotary printing press. Fig. 1 is a schematic side view of the printing press in which the present invention is applied, and Fig. 2 also shows a fourth-color printing unit and a varnishing unit. FIG. 3 is a schematic side view of the varnishing apparatus. In the figure, a printing machine 1 includes a paper feeding device 2, a four-color printing unit 3, a varnishing unit 4, and a paper ejecting device 5.
Each of these devices is separately assembled and connected. Each printing unit 3 is provided with a plate cylinder 6 on which a printing plate is mounted on the circumference, an inking device (not shown) that supplies ink to the plate surface, and a water supply device 7 that supplies dampening water. A blanket cylinder 8 is placed in contact with the cylinder 6 to transfer an image formed on the printing plate using ink and dampening water. In each printing unit 3, an impression cylinder 9 with a double diameter is arranged opposite to the blanket cylinder 8, and between each adjacent impression cylinder 9, a transfer cylinder 10 with a double diameter is also arranged opposite to both impression cylinders 9. It is set up. In addition, the varnishing unit 4 is also provided with a double diameter impression cylinder 11 at the same height as the other impression cylinders.
A transfer cylinder 12 is also disposed between this impression cylinder 11 and the fourth color impression cylinder 9. The paper 13 stacked on the paper stacking table of the paper feeder 2 is sucked one by one by a suction device (not shown) and sent onto the differential plate 14, and then a swing device is used to pick up the impression cylinder 9 of the first color. After that, while the transfer cylinder 10 and the impression cylinder 9 alternately change the grips and are conveyed, four-color printing is applied between the blanket cylinder 8 and the varnishing unit. It is held in the claw of the impression cylinder 11 of No. 4 and wrapped around the circumferential surface. The paper ejection device 5 includes a paper ejection cylinder 15 that faces the impression cylinder 11 and a pair of left and right sprockets 16 coaxially fixed thereto. A paper ejection chain 19 having a large number of paper ejection claws at regular intervals is stretched between the paper ejection chain 18 and the paper ejection chain 18 . Then, the paper 13 held in the claw of the impression cylinder 11 is transferred to the paper ejection claw of the paper ejection chain 19 and conveyed, and is released from the paper ejection claw at the end of the conveyance to the paper stacking table 2.
It is dropped and loaded onto 0.

The varnishing unit 4 of the printing press 1, which is roughly constructed as described above, is provided with a varnishing device generally designated by the reference numeral 21. This varnishing device 21
The varnishing roller includes: a blanket cylinder 22 that is in contact with the impression cylinder 11 and has a blanket wrapped around its circumferential surface; an applicator roller 23 that is in contact with the blanket cylinder 22; and a metering roller 24 that is in contact with the applicator roller. It is composed of a base roller 25 that is in contact with the metering roller 24, and the blanket cylinder 22 is attached to and detached from the applicator roller 23 and the impression cylinder 11 by rotating an eccentric bearing that supports the blanket cylinder 22. It is configured to The original roller 25 is immersed in varnish 27 stored in a trough-like varnish boat 26 and is supported by the left and right frames 28, and the metering roller 24 is supported by bearings at both ends of the original roller 25. Both ends are supported by a pair of supported arms. The metering roller 24 is pressed against the applicator roller 23 while maintaining a predetermined contact pressure by the biasing of a spring member and the regulation of an adjustable stopper, and the predetermined contact pressure is maintained by adjusting the eccentricity of the shaft end. However, it is pressed against the original roller 25. A rider roller 29 is supported by an arm and is brought into contact with the application roller 23. The varnish 27 supplied to the varnish boat 26 by the supply device described later is pulled up by the source roller 25 rotating in the direction of the arrow, and after the film thickness is adjusted by the metering roller 24, it is transferred to the application roller 23. Further, after being transferred from the applicator roller 23 to the blanket cylinder 22, it is applied to the paper 13 passing between the blanket cylinder 22 and the impression cylinder 11.

Varnishing roller group 2 configured as above
2, 23, 24, 25, 29 and the varnishing boat 26 are provided with a cleaning device for these and a device for supplying varnish to the varnishing boat 26. That is, on the side of the frame 8 of the varnishing unit 4, a hermetically sealed tank 30 formed in an oblong rectangular shape is placed on a frame 31 with casters, and the inside of this tank 30 is disposed. A varnish tank 33 and a solution tank 34 are separated by a partition plate 32. tank 3
The outer wall of 0 and the partition plate 32 are formed in double layers, and a heat insulating material is interposed inside to block cold air from outside. Aqueous varnish 35 and cleaning water 37 as a solution supplied from a water pipe 36 are stored inside the varnish tank 33 and solution tank 34, respectively. Discharge ports 38 and 39 are provided for discharging the cleaning water 35 and the cleaning water 37 to the outside of the tank. 40 is a stirrer that stirs the varnish 35 by rotation, and 41 and 42 are pumps that pump up the varnish 35 and wash water 37, respectively, by rotation. And each tank 33, 34
Panel heaters 43 and 44 for heating the varnish 35 and the cleaning water 37 are attached to the bottom plate of the machine. On the other hand, a blanket cylinder cleaning device, generally designated by reference numeral 45, is disposed near the circumferential surface of the blanket cylinder 22 on the rising side in the rotational direction. This rubber cylinder cleaning device 45 includes a gutter-shaped boat 46, which rotates within the boat 46, and cleans the rubber cylinder by hydraulic pressure.
2, an Evol roller 48 that rotates in contact with the sponge roller 47, and a nozzle 4 below the sponge roller 47.
9, and the nozzle 49 and the pump 42 are connected by a pipe 51 provided with a valve 50. Further, the boat 46 is connected to a drainage groove on the floor by a hose 52a. Furthermore, a forming roller cleaning device, generally designated by reference numeral 52, is disposed near the circumferential surface of the forming roller 23. The application roller cleaning device 52 includes a plurality of nozzles 53, a doctor knife 54 whose cutting edge is removably attached to the circumferential surface of the application roller 23, and a gutter-shaped boat 55. is connected to the pump 42 by a pipe 57 equipped with a valve 56.
Further, a hose 58 connected to the boat 55 is led to a drainage groove on the floor.

What is indicated by the reference numeral 59 is the varnish 3 in the tank 30.
5 and washing water 37 to the varnishing vessel 26, one end is connected to the varnishing vessel 26, and each other end branched near the tank 30 is It is connected to a pump 41 and a pump 42, respectively. The branch part of the supply hose 59 has a flow path connected to the pump 41, that is, the varnish tank 3.
An electromagnetic valve 60 is provided to switch between the three side and the pump 42, that is, the solution tank 34 side. Further, the bottom of the varnish boat 26 and the varnish tank 33 of the tank 30 are connected by a discharge hose 61 as a discharge flow path, and from this discharge hose 61 a drain hose 62 as an outside tank discharge flow path is connected to the tank 30. It branches nearby and leads to a drain on the floor. An electromagnetic valve 63 is provided in the branch path of the discharge hose 61 to switch the flow path between the varnish tank 33 side and the drain groove side. Further, a valve 64 for opening and closing the discharge hose 61 is provided near the varnishing boat 26, and the upper part of the varnishing boat 26 and the discharge hose 61 are provided in the vicinity of the varnishing boat 26.
and are connected by an overflow hose 65.

The operation of the printed matter varnishing apparatus configured as above will be explained. When the motor of the machine is started and the paper 13 is fed one by one onto the insert plate 14 by the paper feeding device 2, the paper 13 is conveyed by changing the grip of the claw, and the blanket cylinder 8 is inserted into the cylinder. Paper 13 is printed in four colors between blanket cylinder 8 and impression cylinder 9. paper 1
3 reaches the varnish coating unit 4, the blanket cylinder 22 is inserted into the varnish coating unit 4, so that the varnish 27 in the varnish boat 26 is pulled up by the original roller 25, and after the film thickness is determined by the metering roller 24, it is moved to the applicator roller 23. It is transferred to the rubber cylinder 22 via the rubber cylinder 22. The transferred varnish 27 is transferred to the impression cylinder 11
The varnished paper 1 is coated on the printed surface of the paper 13 that is held in the nails of the paper 13 and passes between the blanket cylinder 22.
3 is conveyed by a paper discharge chain 19 and stacked on a paper stacking table 20. During such varnishing work, the pump 41 is rotating and the electromagnetic valve 60 is switched to the pump 41 side, so the varnish 35 in the varnish tank 33 is pumped up by the pump 41 and sent to the varnish via the supply hose 59. It is supplied to the boat 26. Further, since the electromagnetic valve 63 is switched to the varnish tank 33 side, when the varnish 27 in the varnish boat 26 exceeds a predetermined amount, it overflows and is returned to the varnish tank 33 through the overflow hose 65 and the discharge hose 61. Note that the valve 64 is closed.

When performing cleaning work after finishing the varnishing work, after removing the blanket cylinder 22 and separating it from the forming roller 23 and the impression cylinder 11, the forming roller 23 is attached to and removed from the forming roller 23 by the attaching/detaching device. 22. At this time, since the forming roller 23 moves approximately around the axis of the metering roller 24, the rollers 23 and 24 are not separated from each other. After opening the valve 64 and returning the entire amount of varnish 27 in the varnish tank 26 to the varnish tank 33, the pump 42 is rotated and the valve 50,
When 56 is opened, the cleaning water 37 is pumped up by the pump 42 and passes through the pipes 51 and 57 to the nozzles 49 and 5.
3, the cleaning water 37 is sprayed from a nozzle 49 and a plurality of nozzles 53, and is directed to the forming roller 23.
Then, the metering roller 24 and the original roller 25, which are rotating in opposition to the blanket cylinder 22 and the applicator roller 23, are cleaned. The dissolved varnish is scraped off into the boats 55, 46 by the doctor knife 54 and the sponge roller 47, and is discharged along with the cleaning water to the drainage groove through the hoses 58, 52a. When the solenoid valve 60 is switched to the pump 42 side and the solenoid valve 63 is switched to the drain hose 62 side at the same time as cleaning the rollers,
The washing water 37 is supplied to the varnishing boat 26 through the supply hose 59 to wash the inside of the varnishing boat 26, and the water after washing is discharged to the drainage groove through the discharge hose 61 and the drain hose 62. Since the wash water 37 circulates in this manner, the inside of the varnish boat 26 is washed, and at the same time, the varnish inside the supply hose 59 and the discharge hose 61 is also washed away. In the cleaning operation, the cleaning water 37 is heated in advance by the panel heater 44, so that the cleaning water 37 is heated beforehand by the panel heater 44.
Even if the varnish inside the hoses 59 and 61 is about to harden, it is completely dissolved and cleaned. In addition, the switching of the electromagnetic valves 60, 63, etc. and the pump 4
It is an easy technology to automate the timing of rotation and stop of steps 1 and 42. If this is automated, the varnish supply operation can be immediately switched to the cleaning operation after the varnishing operation is completed, and during this time the operator is not required to do other work. can be involved in the work of

Although this embodiment shows an example in which one electromagnetic valve 60 is provided at the branch portion of the supply hose 59, one electromagnetic valve 60 may be provided for each pump 41, 42. Further, in this embodiment, the pumps 41 and 42, which are provided one each for the varnish tank 33 and the solution tank 34, are reduced to one, and electromagnetic valves are provided between this pump and the varnish tank 33 and the solution tank 34, respectively. Alternatively, one pump and a solenoid valve may be provided between the branch and the varnishing vessel 26. Furthermore, in this embodiment, a solenoid valve 63 is installed at a branch part of the discharge hose 61.
Although an example is shown in which one is provided, one may be provided in the branch part and the varnish tank, and one in the branch part and between the drain tank. Further, each flow path does not need to be a hose 59, 61, 62, but may be a metal or plastic pipe.

〔Effect of the invention〕

As is clear from the above description, in the printed matter varnishing apparatus according to the present invention, a tank consisting of a varnishing tank and a solution tank each equipped with a pump and a heating means, and a varnishing boat are connected by a valve. In addition to providing a solution supply channel that connects the solution tank and multiple locations in the roller cleaning section by connecting a supply channel and a discharge channel, it is also possible to connect the solution tank to multiple locations in the roller cleaning section. By configuring the system to selectively supply varnish and clean the varnish boat, not only can varnish be smoothly supplied during varnishing work, but also the varnish can be supplied in parallel with roller cleaning when cleaning the varnishing equipment. Since the inside of the boat can be cleaned and the supply and discharge channels can be cleaned simultaneously without manual intervention, work efficiency is significantly improved and labor is reduced, and the varnish and solution are warmed by heating means. Therefore, even the varnish that has barely solidified can be dissolved and a complete cleaning operation can be carried out, and the quality of varnished printed matter can be improved when the operation is restarted, and the clogging of the flow path can be prevented. Furthermore, during cleaning, the cleaning liquid can be simultaneously supplied to a plurality of locations on the varnishing boat side and the roller cleaning section side for cleaning, thereby improving the cleaning ability. Additionally, by automating valve switching, pump starting, etc., workers can be redirected to other tasks during cleaning.
Work efficiency improves.

[Brief explanation of drawings]

1 to 3 show an embodiment of the printed matter varnishing apparatus according to the present invention, FIG. 1 is a schematic side view of a four-color sheet-fed rotary printing press in which this is implemented, and FIG. A schematic side view of the printing unit and the varnishing unit, and FIG. 3 is a schematic diagram of the varnishing apparatus. 21...varnishing device, 30...tank, 33
... Varnish tank, 34 ... Solution tank, 41, 42 ... Pump, 43, 44 ... Panel heater, 59 ... Supply hose, 60, 63 ... Solenoid valve, 61 ...
Discharge hose, 62...Drain hose.

Claims (1)

[Claims] 1. A tank consisting of a varnish tank and a solution tank, which has a varnish/solution pump and a heating means for heating the varnish and solution, and a varnish/solution supply stream that connects this tank and the varnish tank of the varnishing section. a solution supply channel that connects the solution tank and a plurality of locations in the roller cleaning section; a valve that switches the supply channel between the varnish tank and the solution tank; A printed matter varnishing apparatus, comprising a varnish supply and varnish boat cleaning device equipped with a valve for switching a discharge flow path between the varnish tank and a discharge flow path outside the tank that branches in the middle of the flow path.