JPH0720699B2 - Varnishing device for sheet-fed printing press - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed offset printing machine, and more particularly to an in-line type varnish coating apparatus having a varnish coating unit subsequent to a final printing unit. The present invention relates to a varnish coating apparatus equipped with various cleaning apparatuses so that a varnish coating operation can be performed thoroughly.

(Background of the Invention) In a sheet-fed offset printing machine, after the printing operation is completed in the final printing unit, the printed paper may be subsequently varnished.

This protects the printing surface because the ink is undried,
Further, it is for preventing so-called set-off and for giving gloss to the paper surface to give a high-class feeling.

(Prior Art) As such an in-line type varnish coating apparatus, there are technologies disclosed in JP-A-59-142148 and JP-A-63-108735. For the varnish coating device cleaning work, which is indispensable for the complete execution of the varnish coating work, only relying on the operator's hand-wiping to present the coating work device.

To be more specific, the blanket cylinder of the varnish coating unit, which is provided after the final printing unit, is in the cylinder removal state during trial printing for registering the paper, etc. May bounce when passing through a varnishing unit and stain the surface of the blanket cylinder with undried ink. Therefore, when it comes time to start the actual printing and also to perform the varnish application work, it is necessary to remove the ink on the surface by some means, but it is difficult to rely on humans for this ink cleaning work. It will take a lot of trouble.

In addition, when the varnish application work is interrupted or terminated in response to the interruption or termination of the printing work, unused varnish remains on the surface of the blanket cylinder of the varnish application unit, but this varnish is quick-drying. , Requires immediate cleaning and removal.

Further, not only the blanket cylinder but also other members of the varnish coating device, such as a varnishing roller and a varnish boat, need to be washed at the end of the varnish coating operation.

(Problems to be Solved by the Invention) As described above, the in-line type varnish coating device can complete the varnish coating work only after the cleaning device is completed. In other words, the varnish application work and the various cleaning works are inseparable. The cleaning work here means removing ink from the blanket cylinder of the varnish coating device,
Similarly, it is intended to remove unused varnish, varnishing roller, varnish boat, etc.

The present invention has been made from the above viewpoint, and provides an improved varnish coating device for a sheet-fed printing press. The purpose of the present invention is to improve efficiency of various cleaning operations and ensure proper varnish coating operation. To be able to carry out.

(Means for Solving the Problems) For this purpose, the present invention is provided with an impression cylinder that conveys the sheet to which the varnish is applied subsequent to the final printing unit, and a contact / separation control for the impression cylinder. In a varnish coating device of a sheet-fed printing press having a blanket cylinder for varnish coating, and a varnishing unit for supplying varnish to the blanket cylinder via a varnishing roller that is controlled to come in and out of contact with the blanket cylinder, A cleaning unit for switching the ink cleaning liquid or the varnish cleaning liquid to the blanket cylinder through a blanket cleaning roller that is controlled to come in and out of contact with the blanket cylinder, and means for supplying the varnish cleaning liquid to the varnishing unit. .

Further, in another aspect of the present invention, the varnish cleaning liquid is hot water for keeping the varnish to be supplied at a constant temperature.

(Function) According to the apparatus of the present invention, the blanket cleaning roller of the cleaning unit contacts the blanket cylinder at a proper time to supply the ink cleaning liquid or the varnish cleaning liquid to the entire surface, so that the ink and the unused varnish of the blanket cylinder are automatically To be removed. In addition, a varnishing unit such as a varnishing roller is quickly cleaned when not in use.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic side view showing an embodiment of a sheet-fed printing machine equipped with a varnish coating device according to the present invention, and FIG. 2 is an enlarged side view of a main part of FIG.

FIG. 1 schematically shows a sheet-fed offset printing machine having four printing units 1 corresponding to four colors, in which each color is sequentially fed to a sheet fed one by one by a sheet feeding device 2. Is printed.

Then, following the final printing unit 1, a varnish coating unit 3 which is the object of the present invention is connected in an in-line system, and the varnish-coated printing paper in this varnish coating unit 3 has a drying means 4 and the like. After passing through the paper discharge device 5, the paper is piled on the paper stack 6.

In FIG. 2, the varnish coating unit 3 is mainly shown in an enlarged manner. 7 is a paper transfer cylinder of the final printing unit 1, 8 is an impression cylinder of the varnish coating unit 3, and 9 is a discharge unit of the paper discharge device 5. The paper cylinder, which is to be coated with varnish, is delivered from the paper transfer cylinder 7 to the bite claw 10 of the impression cylinder 8, and the varnish is transferred between the blanket cylinder 11 of the varnish application unit 3 and the impression cylinder 8. Then, after that, it is delivered to the paper discharge cylinder 9.

The blanket cylinder 11 of the varnish coating unit 3 has a blanket 12 for adhering varnish on its surface,
The contact / separation is controlled so as to take two positions of contact and separation with respect to the impression cylinder 8. This contact / separation control is similar to so-called cylinder insertion / cylinder removal in the printing unit 1, and a method using an eccentric crank mechanism or the like is already well known, and therefore description thereof will be omitted.

Reference numeral 13 indicates a varnishing unit as a whole, and this varnishing unit 13 attaches a varnish to the blanket 12. As shown in the perspective view of FIG. 3, the varnishing unit 13 includes a varnish boat 14 for storing varnish, a varnish source roller 15 that is immersed in the varnish boat 14 to pump up varnish, and a varnish source roller 15 A metering roller for controlling the amount of varnish supplied by
16 and a varnishing roller 17 for transferring the varnish from the varnishing original roller 15 to the 12 surface of the blanket. Of these, the varnishing roller 17 is the blanket cylinder described above.
By the same mechanism as 11, the contact and separation are controlled so that the blanket cylinder 11 has two positions of contact and separation,
Supply varnish to the blanket cylinder 11.

The present invention is based on the above-mentioned varnish coating unit 3.
The cleaning of the ink and varnish in the varnish coating unit 3 is automated so that the original varnish coating operation can be carried out completely. Specifically, it has the following configuration.

That is, since the ink used for printing is oily, while the varnish is water-based and quick-drying, two kinds of cleaning liquids corresponding to both properties are required.

In addition, the target of cleaning is the ink attached to the blanket 12 for varnishing, as well as the blanket.
The unnecessary varnish of 12 and the unnecessary varnish of the varnishing unit 13 such as the varnishing roller 17 and the like.

The ink cleaning of the blanket 12 is required before starting the varnish application work, and the blanket cylinder 11 for the varnish application during the trial printing for registering the paper, etc.
Although it is in the unrolled state, the printed paper may bounce off and smear the 12th surface of the blanket with ink. For this reason, if the adhered ink is not removed, the final printing and the varnish application cannot be performed.

In the case of varnish cleaning, if the printing work is interrupted or finished, the varnish application work is also stopped.
Since unused varnish will remain in 12, it is carried out in order to quickly remove unnecessary varnish that is quick-drying.

Furthermore, the varnish cleaning must be done to completely clean the varnishing unit 13 at the end of the varnishing operation.

In particular, for the ink cleaning of, if the ink of the blanket 12 is not removed and the varnish application is started and the ink is attached even to the impression cylinder 8, the blanket
It should be noted that not only 12 but also the impression cylinder 8 needs to be ink-washed, which results in a great deal of trouble and also significantly lowers the printing and varnishing quality.

Further, if the varnish cleaning is not completed, the varnish will adhere to the blanket 12 and unevenness will occur in the next varnish application, so that excellent varnishing quality cannot be expected.

In order to perform the ink cleaning and the varnish cleaning of the blanket 12 and the above, as shown in FIGS. 2 and 3, a cleaning unit 18 for appropriately switching the ink cleaning liquid or the varnish cleaning liquid and supplying it to the surface of the blanket 12 is provided, Further, in order to perform the above-mentioned varnish cleaning, a varnish cleaning liquid nozzle 19 for supplying a varnish cleaning liquid to the varnishing unit 13 is provided.

The cleaning unit 18 is a cleaning liquid nozzle for spraying an ink cleaning liquid or a varnish cleaning liquid, which is fed by a route described later.
The cleaning liquid ejected from the cleaning liquid nozzle 20 once adheres to the surface of the cleaning roller 21 and is then transferred to the blanket cleaning roller 22.

Similar to the front varnishing roller 17, the blanket cleaning roller 22 is controlled to come into contact with or separate from the blanket cylinder 11 at two positions, contact and separation, and sends the ink cleaning liquid or the varnish cleaning liquid adhering to the surface to the blanket 12 surface. To pay. Then, the ink and varnish washed with one of the two types of washing liquids are, on the contrary, removed and collected via the blanket washing roller 22 and the washing roller 21 which rotate in contact with each other. Further, reference numeral 23 indicates a cleaning knife, and the waste liquid of ink and varnish adhering to the outer periphery of the cleaning roller 21 is scraped off by the cleaning knife 23 and guided to the drainage tank 25 of FIG. .

With respect to the varnish cleaning liquid nozzle 19 that supplies the varnish cleaning liquid to the varnishing unit 13, the situation is almost the same as that of the cleaning liquid nozzle 20, and the varnish cleaning liquid is sprayed from the varnish cleaning liquid nozzle 19 to the varnish source roller 15 and the varnishing roller 17 The metering roller 16 and thus the varnish boat 14 are cleaned with the varnish cleaning liquid, and the waste liquid is guided to the waste liquid tank 25 shown in FIG.

FIG. 4 is a path explanatory view showing a supply path of various cleaning liquids, and particularly, the inside of the varnish and the varnish cleaning liquid storage tank 26 shown by one box in FIG. 3 is shown.

First, the ink cleaning liquid for performing the above-described ink cleaning is stored in the ink cleaning liquid tank 27, and the supply thereof is controlled by the solenoid valve 28 and guided to the cleaning liquid nozzle 20.

Next, regarding the above-mentioned varnish cleaning liquid, the device of the present invention is characterized by utilizing hot water for keeping the varnish at a constant temperature. To explain this, the varnish is stored in the varnish tank 29 inside the storage tank 26, and passes through the varnish circulation pump 30 and various pipes, and a varnishing unit is provided.
Delivered to 13 varnish boats 14.

By the way, since this aqueous varnish is quick-drying, it is necessary to keep it at a constant temperature by the hot water jacket 31 surrounding the varnish tank 29. Therefore, a hot water tank 33 having a heater unit 32 is provided in the storage tank 26, and hot water of a constant temperature is supplied from the hot water tank 33 to the hot water jacket 31 via the hot water circulation pump 34 and the like. There is.

In order to use this warm water as it is for cleaning the aqueous varnish,
From the warm water tank 33, through the warm water circulation pump 34, to the washing unit 18
Hot water is introduced to the cleaning liquid nozzle 20 and the varnish cleaning nozzle 19 of the varnishing unit 13. And this hot water delivery is
It is controlled by solenoid valves 35 and 36. In particular, the solenoid valves 28, 35 are controlled in association with each other in order to spray the ink cleaning liquid or the varnish cleaning liquid (warm water) by switching from one cleaning liquid nozzle 20 at a suitable time.

Next, the operation will be described with reference to the side views of FIGS. 5 to 8.

First, when the varnish is not applied (for example, trial printing), the blanket cylinder 11 is replaced by the impression cylinder 8 as shown in FIG.
The varnishing roller 17 of the varnishing unit 13 and the cleaning roller 21 of the cleaning unit 18 are also separated from the blanket cylinder 11 at this time.

When the desired first printing paper 37 reaches the paper transfer cylinder 7 of the final printing unit 1 for varnish application, the blanket cylinder 11 is inserted into the impression cylinder 8 as shown in FIG. To be done.

Subsequently, as shown in FIG. 6, the varnishing roller 17 also comes into contact with the blanket cylinder 11, and the varnish begins to adhere to the blanket 12 surface.

Then, as shown in FIG. 7, the varnish on the surface of the blanket 12 is applied to the surface of the printing paper 37 at the counter contact point between the impression cylinder 8 and the blanket cylinder 11 to apply varnish.

Blanket after varnish application is completed or before varnish application
When the 12-sided ink is washed, as shown in FIG. 8, the blanket cylinder 11 is removed from the impression cylinder 8, and the varnishing roller 17 is also separated from the blanket cylinder 11. It is said that Then, the blanket cleaning roller 22 of the cleaning unit 18 is brought into contact with the blanket cylinder 11, and the ink cleaning liquid or varnish cleaning liquid ejected from the cleaning liquid nozzle 20 passes from the cleaning roller 21 to the blanket cleaning roller 22 and then to the blanket 12 surface. Sent. Also in the varnishing unit 13, the varnish cleaning liquid nozzle
A varnish cleaning liquid is ejected from 19 to clean the varnishing roller 17 and the like.

(Effects of the Invention) According to the apparatus of the present invention, various cleaning operations that are integral with the varnish application operation are automated, so that the varnish application operation can be performed efficiently and thoroughly.

In addition, since the varnish cleaning liquid originally uses the hot water that keeps the varnish at a constant temperature, the facility cost is low.

Further, by automating the various cleaning operations, the varnish application operation can be completely performed from the desired first printing paper sheet, and thus the blocking of the printing paper sheets sticking to each other can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a sheet-fed printing machine equipped with a varnish coating device according to the present invention, FIG. 2 is an enlarged side view of a main part of FIG. 1, and FIG. FIG. 4 is a perspective view schematically showing various cleaning devices, FIG. 4 is a route explanatory view showing supply routes of various cleaning liquids, etc., and FIGS. 5 to 8 are side views showing the operation of the varnish coating unit. It is a figure. 1 ... Printing unit, 3 ... Varnishing unit, 7 ... Paper transfer cylinder, 8 ... Impression cylinder, 9 ... Discharge cylinder, 11 ... Blanket cylinder, 12 ...
Blanket, 13 ... Varnishing unit, 14 ... Varnish boat, 15
... varnish source roller, 16 ... metering roller, 17 ... varnishing roller, 18 ... cleaning unit, 19 ... varnish cleaning liquid nozzle, 20 ... cleaning liquid nozzle, 21 ... cleaning roller, 22 ... blanket cleaning roller, 26 ... storage tank, 27 … Ink cleaning liquid tank, 28,35,36
… Solenoid valve, 29… varnish tank, 31… hot water jacket, 32… heater unit, 33… hot water tank, 34… hot water circulation pump.

Claims (2)

[Claims] 1. An impression cylinder which conveys a sheet to which varnish is applied subsequently to a final printing unit, a blanket cylinder for applying varnish which is controlled in contact and separation with respect to the impression cylinder, and a blanket cylinder. A varnishing device of a sheet-fed printing press having a varnishing unit for supplying varnish to the blanket cylinder via a varnishing roller controlled to contact and separate, wherein a blanket cleaning roller controlled to contact and separate from the blanket cylinder. A cleaning unit for switching the ink cleaning liquid or the varnish cleaning liquid to supply the blanket cylinder to the blanket cylinder, and a unit for supplying the varnish cleaning liquid to the varnishing unit. 2. A varnish coating device for a sheet-fed printing press according to claim 1, wherein the varnish cleaning liquid is hot water for holding the varnish to be supplied at a constant temperature.