JPH0441971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an apparatus for supplying a coating liquid such as ink or coating to a gravure cylinder or the like.

(Prior art) In the gravure printing method, a coating liquid such as ink or coating liquid is supplied to a cylinder with cells formed on the circumferential surface, and after scraping off the excess coating liquid on the circumferential surface of the cylinder with a doctor. , is a printing method in which the coating liquid in the cell is transferred to the printing sheet, and the method of supplying the coating liquid to the cylinder is generally a dodging method.

FIG. 6 is a schematic diagram showing the dip-dipping method in gravure printing. In the figure, 50 is a cylinder, 51 is a doctor, 52 is an impression cylinder, 53 is an ink tank, 54 is an ink pump, 60 is an ink pan, and 61 is an ink tank. A discharge pipe, 62 is an ink supply hose, F is a coating liquid, and W is a printing sheet. As shown in the figure, in the dobu-dipping method, the ink pan 60 is filled with the coating liquid F, the lower part of the cylinder 50 is immersed in the coating liquid F in the ink pan 60, and the cylinder 50 is rotated so that the circumferential surface of the cylinder 50 is Coating liquid F is supplied throughout.
Further, the ink tank 53 is also filled with the coating liquid F, and the ink supply hose 6 is filled with the ink pump 54.
The coating liquid F is supplied into the ink pan 60 through the ink pan 60 . A weir (not shown) is provided in the ink pan 60 to keep the liquid level at a constant level, and excess coating liquid F is returned to the ink tank 53 through the ink discharge pipe 60. This replenishes the coating liquid F into the ink pan 60 and also replenishes the ink tank 53.
This is for circulating the coating liquid F in the ink pan 60 through the ink pan 60.

By the way, in the dip-dipping method as described above, although the coating liquid supply device can be simplified, since the cylinder 50 is immersed in the coating liquid, the ink pan 6
It is necessary to fill the inside of the ink pan 60 with a certain amount of coating liquid, resulting in a problem that a large amount of coating liquid remains in the ink pan 60 even after printing is completed.

In order to reduce the amount of coating liquid remaining in the ink pan 60 after printing is completed (hereinafter referred to as "pan residual liquid"), various methods have been proposed in which the cylinder 50 is not immersed in the coating liquid in the ink pan. For example, in the invention of Utility Model Application Publication No. 47-6903, an ink discharge device is provided below the main doctor, a deformed doctor that contacts the plate cylinder is provided below this ink discharge device, and an ink pan is further provided below that. ing. In addition, in the invention of JP-A No. 58-166051, a blade is provided at a position approximately symmetrical to the doctor position with respect to the center of the plate cylinder, and this blade is pressed against the circumferential surface of the plate cylinder, and the plate cylinder and blade An applicator for supplying a coating liquid is provided between the two.

(Problems with the prior art) However, in the invention of Utility Model Application Publication No. 47-6903, the ink discharge device, deformed doctor, and ink pan are each separate, making the entire ink supply device complicated and printing problems. A problem has arisen in that it takes a long time to clean up the parts, such as setting each part during preliminary preparation and cleaning each part after printing is completed. In addition, in the invention of JP-A-58-166051, in addition to the problem that the entire ink supply device becomes complicated as in the above-mentioned invention, the blade and plate cylinder are connected only by the application liquid discharged from the applicator. A problem has arisen in that a pool of coating liquid must be formed between the applicators and a large pump is required to constantly discharge a large amount of coating liquid from the applicator. Furthermore, since both methods press a deformed doctor or blade against the plate cylinder surface, there is a problem in that it is nearly impossible to print for a long time without damaging the plate cylinder surface.

(Purpose of the invention) The present invention was created in view of the above-mentioned problems, and it reduces the amount of leftover liquid in the pan, simplifies the entire device, eliminates the need for prolonging preparatory work and cleanup, and enables longer printing times. It is an object of the present invention to provide a coating liquid supply device that does not damage the circumferential surface of a cylinder even when it is applied.

(Summary of the invention) To achieve this objective, the present invention consists of an inclined plate located below the gravure cylinder on the doctor side with a slight gap from the circumferential surface of the gravure cylinder, and an inclined plate located below the gravure cylinder on the doctor side. an ink pan having a liquid reservoir connected to the ink pan, an elevating device located at the bottom of the ink pan and supporting the ink pan, and supplying a coating liquid between the slope plate and the gravure cylinder from the top of the slope plate, A coating liquid supply device to a gravure cylinder is provided, which includes a coating liquid circulation device for discharging the supplied coating liquid from the liquid reservoir and again supplying the discharged coating liquid to the upper part of the inclined plate.

(Function) Here, in the present invention, the coating liquid supplied to the ink pan from the upper part of the inclined plate flows downward along the inclined plate, and a part of it is applied to the circumferential surface of the rotating cylinder. The remaining coating liquid flows into the liquid reservoir, and the coating liquid is again supplied from the upper part of the inclined plate by the coating liquid circulation device.
Since the inclined plate is disposed with a slight gap from the cylinder, the coating liquid scraped off by the doctor and the coating liquid flowing downward from the upper part of the inclined plate are connected to the cylinder and the inclined plate. A suitable coating liquid reservoir is formed between the plate and the rotating cylinder, and the coating liquid is continuously supplied to the rotating cylinder.

Furthermore, by raising and lowering the lifting device 30, the gap between the inclined plate of the ink pan 1 and the gravure cylinder can be optimally adjusted for a gravure cylinder of any diameter, and the coating liquid can always be supplied optimally.

(Example) An example of the apparatus of the present invention will be described below based on the same figure.

FIG. 1 is a schematic front view of an apparatus showing an example of the present invention. In the figure, 1 is an ink pan, 10 is a pedestal, and 30 is an elevating device for the ink pan 1. Second
The figure is a - arrow view in Fig. 1, Fig. 3 is a perspective view of the ink pan 1 shown in Fig. 1, and Fig. 4 is a - arrow view in Fig. 2.
FIG. 5 is a sectional view taken along the - arrow in FIG. 1. Further, parts common to those in FIG. 6 are denoted by the same reference numerals.

As shown in FIG. 1, the apparatus of the present invention includes an ink pan 1 disposed below a cylinder 50, a pedestal 10 for holding the ink pan 1, a lifting device 30 for raising and lowering the ink pan 1 via the pedestal 10, and an ink tank. 53, an ink pump 54, a discharge pipe 8, and a coating liquid circulation device 49 consisting of a hose 7.

As shown in FIG. 3, the ink pan 1 is a flat box-like body with an open top and an inclined plate 2 at the bottom and a recess 3 connected to the lower edge of the inclined plate 2.
An inlet 4 for a coating liquid is provided at the center of the upper part of the inclined plate 2, and an outlet 5 is provided at one longitudinal side of the recess 3. The recess 3 forms a liquid reservoir together with the side plates in the longitudinal direction. Further, on the upper part of the lower surface of the inclined plate 2, there is a pair of L for fixing the ink pan 1 to the stand 10, as shown in FIGS.
A letter-shaped fixing member 6 is provided.

As shown in FIGS. 1, 4, and 5, the pedestal 10 has an upper plate 1 connected at one end with a hinge portion 13.
1 and a lower plate 12, a support guide 14 that holds the lower plate 12 movably in the horizontal direction, an adjustment screw 15 that moves the lower plate 12 in the horizontal direction, a support plate 16 that fixedly holds the support guide 14, and a support guide 14 that holds the lower plate 12 movably in the horizontal direction. The plate body 16a and the support guide 1 are arranged horizontally from the lower end.
4, a rod 18 that is rotatably held on the upper plate 11 by a connecting member 17 and protrudes below the plate body 16a through the coil spring 22; A collar 20 that presses down the coil spring 22 from above and below,
It is composed of 21. The connecting member 17 is the upper plate 1
The connecting member 17 and the upper end of the rod 18 are connected by a pin 19. As shown in FIG. 4, the adjustment screw 15 is provided with a grip 15a and a threaded portion 15b, and the threaded portion 15b is attached to the lower plate 1.
2, and its tip is rotatably held by a plate 14a connected below one end of the support guide 14. There is. The lower plate 12, the support guide 14 and the plate body 16a each have elongated holes 12.
b, 14b, and 16b are provided, and a rod 18 passes through these elongated holes. Therefore, by rotating the grip 15a, the lower plate 12 moves horizontally along the support guide 14, and by applying pressure to the upper plate 11 from above, the upper plate 11 moves downward around the hinge part 13. Rotate and move and color 2
0 and 21 compress the coil spring 22, and when this pressure is released, the restoring force of the coil spring 22 causes the upper plate 11 to return to its original position.

As shown in FIGS. 1 and 2, the lifting device 30 includes a corner member 31 provided with a rack 31a, and a guide block 3 that holds the corner member 31 so that it can be raised and lowered.
2. Upper and lower pressing plates 33a and 33b that press the corner member 31 against the guide block 32, a retaining plate 34 fixed to one surface of the guide block 32, and the retaining plate 3
a shaft 3 that penetrates through the shaft 4 and is rotatably held;
5. A pinion gear 36 that is fitted and fixed to the shaft 35 and meshes with the rack 33a, a handle 37 that is fitted and fixed to one end of the shaft 35, and a stay 3 that fixes and supports the flange portion 32a of the guide block 32.
It is composed of 8. As shown in FIG. 2, the stay 38 is fixed by extending over the inner lower part of the frames 58, 58, the shaft 35 passes through the frame 58 on one side and is rotatably held by this frame 58, and the handle 37 is frame 58
It is located outside of. Therefore, handle 3
By rotating 7, the corner member 31 is raised and lowered via the binion gear 36 and the rack 31a.

Here, the ink pan 1 is fixedly supported on a pedestal 10 by an upper plate 11 inserted between the fixed member 6 and the lower edge of the inclined plate 2, and the pedestal 10 is supported on the upper part of the corner member 31. A pair of pedestals 10 and corner members 31 are arranged on both sides of the ink pan 1 in the longitudinal direction. Therefore, the ink pan 1 is raised and lowered by the lifting device 30 and moved in the horizontal direction by the adjusting screw 15, so that the circumferential surface and the inner surface of the inclined plate 2 of the ink pan 1 can be adjusted against the cylinder 50 of any diameter. A small gap can be provided between them.

The coating liquid circulation device 49 is composed of an ink tank 53, an ink pump 54, a hose 7, and a discharge pipe 8, as shown in FIG. and,
One end of the hose 7 is connected to the discharge port 55 of the ink pump 54
The other end of the discharge pipe 8 is connected to the inlet port 4 of the ink pan 1, and one end of the discharge pipe 8 is connected to the discharge port 5 of the ink pan 1, and the other end is located inside the ink tank 53. Therefore, the coating liquid is circulated between the ink pan 1 and the ink tank 53 via the ink pump 54.

Next, the operation of the above device will be explained.

First, the cylinder 50 is set on the frames 58, 58, and then the ink pan 1 is set at a predetermined position on the pedestal 10. Next, operate the handle 37 to bring the ink pan 1 closer to the circumferential surface of the cylinder 50, and then operate the adjustment screw 15 to move the ink pan 1 closer to the circumferential surface of the cylinder 50.
A slight gap is provided between the inner surface of the inclined plate 2 and the circumferential surface of the cylinder 50. Then, when the ink pump 54 set in the ink tank 53 filled with coating liquid in advance is operated and the cylinder 50 is rotated, the coating liquid flowing into the ink pan 1 from the inlet flows along the inner surface of the inclined plate 2. A part of the liquid is applied to the circumferential surface of the rotating cylinder 50, and the remaining coating liquid further flows down the cylinder 50 along the inclined plate 2, into the recess 3, and from the discharge port 5. Ink tank 5 via discharge pipe 8
It will be discharged within 3 days. Next, when the doctor 51 is set, the coating liquid applied to the circumferential surface of the cylinder 50 is scraped off by the doctor 51, and the coating liquid applied to the circumferential surface of the cylinder 50 is scraped off.
The coating liquid remaining in the cell No. 0 is transferred to the traveling sheet W via the impression cylinder 52.

Here, since there is a slight gap between the circumferential surface of the cylinder 50 and the inner surface of the inclined plate 2, the coating liquid flowing down from the upper part of the inclined plate 2 and the coating liquid scraped off by the doctor 51 can be separated. A suitable coating liquid reservoir is always formed between the cylinder 50 and the inclined plate 2, and the coating liquid is continuously applied to the circumferential surface of the cylinder 50. If this gap is large, no coating liquid reservoir will be formed between the cylinder 50 and the inclined plate 2, and all the coating liquid that has flowed into the ink pan 1 will pass through the gap and flow downward, and will be coated on the circumferential surface of the cylinder 50. It becomes impossible to continuously supply liquid. Therefore, the gap cannot be made very large, and in this embodiment, it is desirable that it be several mm or less (preferably about 1 mm).

In addition, since the gap between the cylinder 50 and the inclined plate 2 is small as described above, the pedestal 10 has a hinge part as a safety measure in case the operator's hand or the like gets caught in the gap while the cylinder 50 is rotating. 13, an escape mechanism for the ink pan 1, which is composed of a coil spring 22 and the like, is provided. That is, when the worker's hand is caught in the gap, the coil spring 22 is pressurized,
Since the ink pan 1 rotates downward about the hinge portion 13, the operator can remove his or her pinched hand without getting caught in the cylinder 50. When the operator removes his or her pinched hand, the pressure on the coil spring 22 is released and the ink pan 1 returns to its original position.

(Effects of the invention) As described above, the present invention has an inclined plate located below the cylinder on the doctor side and arranged with a slight gap from the circumferential surface of the cylinder, and an inclined plate connected to the lower part of the inclined plate. An ink pan having a liquid reservoir provided therein is provided, and a coating liquid is supplied between the inclined plate and the cylinder from the upper part of the inclined plate, the supplied coating liquid is discharged from the liquid reservoir, and then the coating liquid is discharged again from the liquid reservoir. In order to supply this discharged coating liquid to the upper part of the inclined plate, the disadvantage of the soaking method in which there is a large amount of liquid remaining in the pan is solved, and the supply port for the coating liquid to be supplied to the cylinder is arranged close to the cylinder. The plate and the reservoir for the supplied coating liquid are integrated to simplify the device, making it easier to set up the ink pan, prepare for cleaning, and clean up afterwards. In addition, since a slight gap is provided between the inclined plate and the cylinder, and an appropriate coating liquid reservoir is formed between the cylinder and the inclined plate, the circularity of the cylinder can be reduced. The effect is that continuous printing can be performed for a long time without damaging the peripheral surface.

Furthermore, by raising and lowering the lifting device, even when cylinders of various diameters are used depending on the size of the image, the gap between the circumferential surface and the inclined plate of the ink pan can always be maintained at an optimum value, and the ink can be injected with the appropriate amount. This has the effect that the coating liquid can be supplied.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an apparatus showing an example of the present invention, FIG. 2 is a view taken along the - arrow in FIG. 1, FIG. 3 is a perspective view of the ink pan 1 shown in FIG. 1, and FIG. 2
5 is a sectional view taken in the direction of the - arrow in the figure, and Figure 5 is the -
A sectional view taken in the direction of arrows, FIG. 6 is a schematic diagram showing the dobuzuke method in gravure printing. 1... Ink pan, 2... Inclined plate, 3... Recess, 4... Inlet, 5... Outlet, 7... Hose, 8... Outlet pipe, 10... Frame, 11...
Upper plate, 12... Lower plate, 13... Hinge part, 14...
... Support guide, 15 ... Adjustment screw, 16 ... Support plate, 17 ... Connection member, 18 ... Rod, 22 ...
... Coil spring, 30 ... Lifting device, 31 ... Corner member, 32a ... Rack, 32 ... Guide block, 35 ... Shaft, 36 ... Pinion, 38
... Stay, 49 ... Coating liquid circulation device, 50 ...
Cylinder, 51...Doctor, 52...Impression cylinder, 5
3... Ink tank, 54... Ink pump, 5
8...Frame.

Claims (1)

[Scope of utility model registration request] Located below the gravure cylinder on the doctor side,
an ink pan having an inclined plate disposed with a slight gap with respect to the circumferential surface of the gravure cylinder and a liquid reservoir connected below the inclined plate; and an ink pan located below the ink pan and supporting the ink pan. A lifting device supplies a coating liquid between the inclined plate and the gravure cylinder from the upper part of the inclined plate, discharges the supplied coating liquid from the liquid reservoir, and returns the discharged coating liquid to the 1. An apparatus for supplying a coating liquid to a gravure cylinder, comprising a circulation apparatus for supplying a coating liquid to an upper part of an inclined plate.