JPH046913Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention is a printed matter varnishing method that is installed in the upstream side of the paper discharge device of a rotary printing press or in an independent varnishing machine to apply varnish to the printed surface of paper after printing. It is related to the device.

[Prior art]

The printed surface of paper printed with a rotary printing press is prone to staining during subsequent processes because the ink dries slowly, and in the case of sheet-fed paper, set-off occurs when stacking the discharged paper, 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. BACKGROUND ART Preventing stains and giving gloss to paper surfaces is mainly carried out for printed matter that requires beauty, such as book covers, catalogs, and pamphlets.

This type of varnishing device is generally installed between the printing unit and paper ejection device of a rotary printing press, and may also be installed in an independent varnishing device or used as a water supply device for the printing unit. has also been attempted. Its structure includes a group of rollers arranged in the same way as the water supply device of the printing unit, and the varnish stored in the varnish tank is supplied to the surface of the blanket cylinder via this group of rollers, and the varnish is distributed between the blanket cylinder and the impression cylinder. Many of them are designed to transfer varnish from a rubber cylinder to the paper passing through it.

The varnish boat in this type of varnishing equipment is shaped like a gutter and is connected to a varnish tank installed outside the machine through piping, and the varnish is heated to a temperature controlled by a heater and a stirring device installed in the varnish tank. The varnish is circulated by a pump while being adjusted so that the concentration is uniform throughout the varnish tank. In addition, since maintaining a constant amount of varnish in the varnishing tank is a major factor in ensuring uniform varnishing, the varnishing tank is equipped with an overflow port to collect excess varnish into the varnish tank. This has been done for a long time.

However, in conventional varnishing boats, the overflow port is at the top and the original roller is rotating, so the varnish in the upper layer is stirred up, but the varnish in the lower layer is almost stationary, so it is affected by the drop in temperature. As a result, the viscosity and concentration increase, and the varnish that has a difference in temperature and viscosity between the upper and lower layers is supplied to the varnished area, causing uneven film thickness of the applied varnish and significantly reducing the quality of the product. I was letting it happen. In order to eliminate this problem, the interior of the varnishing boat is periodically stirred, but the workability is poor and this is often neglected, so that sufficient effects cannot be expected.

[Summary of the idea]

The present invention was developed in view of the above points, and by providing a varnish discharge port connected to a varnish tank with a varnish discharge pipe at the bottom of a varnish boat equipped with a varnish supply port and an overflow port. The present invention provides a printed matter varnishing device that improves the quality of varnished printed matter by promoting the movement and agitation of the varnish in the lower layer inside the varnishing vessel and supplying varnish with stable viscosity. 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 this invention is applied, and Fig. 2 also shows a fourth-color printing unit and a varnishing unit. FIG. 3 is a cross-sectional view of the varnish boat. In the figure, a printing machine 1 is equipped with 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 assembled separately and joined together. Each printing unit 3 is provided with a plate cylinder 6 having a printing plate attached to its circumferential surface, an inking device (not shown) that supplies ink to the plate surface, and a water supply device 7 that supplies dampening water. The cylinder 6 includes a rubber cylinder 8 that transfers the image formed on the printing plate using ink and dampening water.
are facing each other. In each printing unit 3, an impression cylinder 9 with a double diameter is disposed in opposition to the blanket cylinder 8, and between each adjacent impression cylinder 9, a transfer cylinder 10 with a double diameter as well is arranged.
are provided opposite to both impression cylinders 9. Also, the varnishing unit 4 is provided with a double diameter impression cylinder 11 at the same height as the other impression cylinders, and a transfer cylinder 12 is disposed between this impression cylinder 11 and the fourth color impression cylinder 9. ing. 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 being conveyed while being alternately gripped by the claws of the transfer cylinder 10 and the impression cylinder 9, printing in four colors is applied between the blanket cylinder 8 and the varnishing unit 4. Impression cylinder 1 provided
It is held in the claw of No. 1 and wrapped around the circumference. 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 them. 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 at the end of the conveyance, it is released from the paper ejection claw and falls onto the paper stacking table 20. It will be piled up.

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 23. , and a base roller 25 that is in contact with the metering roller 24. Of these, the blanket cylinder 22 is configured to rotate the eccentric bearing that supports the blanket cylinder 22, thereby increasing the applicability of the applicator roller 2.
3 and the impression cylinder 11. Further, the original roller 25 is pivotally supported by the left and right frames 28 with its lower part immersed in varnish 27 stored in a varnish boat 26, which will be described later.
Both ends of the metering roller 24 are supported by a pair of arms pivotally supported by bearings at both ends of the original roller 25. 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. 29
is a rider roller supported by an arm and opposed to the application roller 23. The varnish 27 stored in the varnish boat 26 is pulled up by the original roller 25 rotating in the direction of the arrow, the film thickness is adjusted by the metering roller 24, and then transferred to the applicator roller 23, and then from the applicator roller 23. After being transferred to the blanket cylinder 22, it is applied to the paper 13 passing between the blanket cylinder 22 and the impression cylinder 11.

Next, the structure of the varnish boat 26 will be explained. The varnish boat 26 is formed in the shape of a gutter and has approximately the same length as the rubber cylinder 22, and is supported on the frame 28 side, and its bottom surface is sloped downward from both ends toward the center. A varnish supply pipe 30 connected to a varnish tank (not shown) is opened above one end in the longitudinal direction, and the varnish 27 is supplied to the varnish boat 26 by operating a pump provided near the varnish tank. There is. Also, the supply pipe 3 of the varnishing boat 26
At the end opposite to the 0 opening side, an overflow pipe 31 as an overflow device is connected to the varnish tube 2.
7, and its upper open end is
It is set at a predetermined height slightly lower than the upper end of the varnish boat 26 so that the varnish 27 overflows.
A discharge port 32 corresponding to the overflow pipe 31 is opened in the bottom plate of the varnish boat 26.
A pipe joint 34 is connected to the varnish tank 2 through a hose 33. Furthermore, another discharge port 35 is opened at the lowest part of the bottom plate, which is the center in the longitudinal direction of the varnish boat 26, and a pipe joint 36 connected to this discharge port 35 and the pipe joint 34 can be freely adjusted in opening degree. It is connected by a pipe 38 with a pipe 37.

In the varnishing apparatus configured as described above, the varnish 27 stored in the varnish tank is pumped up and supplied to the end of the varnish boat 26 via the varnish supply pipe 30. When the surface of the supplied varnish 27 exceeds the upper open end of the overflow pipe 31, it overflows and is discharged from the discharge port 32, and is returned to the varnish tank via the pipe joint 34 and hose 33. Further, when the pot 37 is opened, a part of the varnish 27 is discharged from the discharge port 35 even if it does not overflow, and is returned to the varnish tank via the pipe joint 36, the pot 37, the pipe 38, the pipe joint 34, and the hose 33. The opening degree of the pot 37 is adjusted while checking the overflow condition, so that the main return is performed from the discharge port 35 without causing almost any overflow. However, during normal operation, it goes without saying that a smaller amount of varnish is discharged than the amount supplied from the varnish supply pipe 30. By doing this, the varnish 27 moves from one end of the varnish boat 26 where the varnish supply pipe 30 opens toward the center where the discharge port 35 opens, so that the varnish 27 in the lower layer near the bottom plate is also agitated by this movement. Ru. Note that the pot 37 is also used when cleaning the varnishing boat 26. That is, when cleaning the inside of the varnishing boat 26 by discharging the varnish 27 in the varnishing boat 26 and supplying cleaning liquid to the varnishing boat 26 instead, if the pot 37 is fully opened after cleaning, the cleaning solution will be drained to the last minute amount. It can be returned to the cleaning liquid tank.

FIG. 4 is a cross-sectional view of a varnishing boat 26A showing another embodiment of the present invention corresponding to FIG. A discharge port 32 is opened at the lowest part thereof, and a drain hose 33 is connected to this via a pipe joint 34. An overflow pipe 3 is provided at the discharge port 32.
1A are joined, and a plurality of small holes 39 are bored in the lower end thereof to communicate the inside of the varnishing vessel 26A and the inside of the overflow pipe 31A. By doing this, the varnish 2 supplied from the varnish supply pipe 30
7 overflows and is discharged from the overflow pipe 31A through the discharge port 32, flows toward the small hole 39 which is the lowest part, enters the overflow pipe 31A, and is discharged through the same hose 33. Therefore, the lower layer varnish 27 is the varnish boat 26
While flowing from one end of A to the other, it is sufficiently stirred.
Note that it is desirable to make the overflow pipe 31A removable for draining liquid during cleaning of the varnish tank.

Furthermore, FIG. 5 is a sectional view of a varnishing boat showing another embodiment of the present invention, and this embodiment is the same as the varnishing boat 26A shown in FIG. 4 except for the overflow device. . That is, the overflow pipe 31A is not used as an overflow device, and instead, a small chamber 41 partitioned by a partition plate 40 is provided at one end of the varnish boat 26B, and this is used as an overflow device. And around the small room 41 there are 26 varnished boats.
A plurality of small holes 42 that communicate between the inside of B and the inside of the small chamber 41
is drilled. By doing this, the varnish 27 supplied from the varnish supply pipe 30 overflows and is discharged from the small chamber 41 through the outlet 32, and flows toward the small hole 42, which is the lowest part, and then flows into the small chamber 41. enters and exits through the same hose 33. Therefore, the varnish 27 in the lower layer is sufficiently agitated while flowing from one end of the varnish boat 26B to the other end.

[Effects of the invention] As is clear from the above explanation, in the printed matter varnishing apparatus according to the invention, the varnish supply pipe connected to the varnish tank is opened above the varnishing boat,
An overflow device connected to the varnish discharge pipe is opened at a predetermined varnish liquid level position in the varnish vessel, and a varnish discharge port is opened at or near the bottom of the varnish vessel and discharges less varnish than the supplied amount. By communicating with the pipe and configuring the varnish discharge port to be drained at the same time as the overflow, the movement and agitation of not only the upper layer of varnish inside the varnish tank but also the lower layer varnish is promoted, and the inside of the varnish tank is Because there is no viscosity or density unevenness throughout the varnish,
A stable varnish film with no uneven thickness is applied to the printed matter, and the quality of the printed matter can be significantly improved. Furthermore, at the end of the varnishing process, the entire amount of varnish in the varnishing boat can be automatically discharged by simply stopping the supply of varnish without having to remove the overflow device, allowing the worker to manually operate the varnishing boat. Since there is no need to do this, it can contribute to the automation of the entire device, so a series of operations such as collecting varnish, cleaning the varnish boat by supplying solvent, and treating waste liquid can be automated, which is extremely effective. As shown in the example, if a varnish supply port is provided at one end and the other end of the varnish vessel, stirring of the varnish will be further promoted and the effect will be significant. If provided, the ratio to the amount of drained liquid due to overflow can be adjusted and the effect can be maximized.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the apparatus for varnishing printed matter according to the present invention, Figure 1 is a schematic side view of a printing press in which this is implemented, and Figure 2 is a printing unit for the fourth color and varnishing. A schematic side view of the unit, Figure 3 is a sectional view of the varnish boat, Figures 4 and 5.
Each figure is a cross-sectional view of a varnish boat showing other embodiments of the present invention corresponding to FIG. 3. 21...varnishing device, 26, 26A, 26B
... Varnish boat, 27 ... Varnish, 29, 42 ... Small hole, 30 ... Varnish supply pipe, 31, 31A ... Overflow pipe, 32, 35 ... Discharge port, 33 ... Hose, 41 ... Small chamber .

Claims (1)

[Scope of utility model registration request] A varnish supply pipe connected to a varnish tank is opened above a varnish tank formed in the form of a gutter that stores varnish in which the lower part of the former roller is immersed, and a varnish discharge pipe is connected between the varnish tank and the varnish tank. An overflow device is opened at a predetermined varnish liquid level position in the varnish vessel, and a varnish discharge port that is opened at or near the bottom of the varnish vessel and discharges less varnish than the supplied amount is communicated with the varnish discharge pipe. A printed matter varnishing device featuring: