JPS59159345A - Spray apparatus for planographic printing press - Google Patents

Abstract

PURPOSE:To uniformize the supply amount of dampening water to a roller, by surrounding a plurality of spray nozzles by an upper and lower flat hoods each having a traversely long opening part at a place facing to the surface of the roller while, if necessary, providing a spray amount control piece in the vicinity to each opening part. CONSTITUTION:Above the surface of the roller 1 of a planographic printing press, an apparatus for spraying and supplying moisture such as water or alcohols from a plurality of spray nozzles 2 provided in parallel to the axial line of the roller 1 so as to leave a constant interval from said roll by air pressure is constituted. A plurality of the spray nozzles 2 are surrounded by an upper and a lower fault hoods 4 each having a traversely long opening part at a place facing to the surface of the roller 1 and, if necessary, a spray amount control piece 5 is provided in the vicinity of each opening part 3 and the spray amount at the places where the spray nozzles 2 are provided is dispersed left and right to perform the uniform supply of dampening water to the entire surface of the roller 1.

Description

[Detailed description of the invention] The present invention relates to a spray device for a lithographic printing press.

Normally, to supply a dampening solution such as water or alcohol to a lithographic printing press, a source roller rotates in a water reservoir, and the dampening solution is supplied from the M-shape 1]-ra to the plate surface via a water transfer roller and an intermediate roller. For this reason, ink from the first printing plate may flow back into the water reservoir, which is one of the causes of background stains on printed matter, and there are also problems such as this dampening water device requiring a large space.

In order to solve these problems, various methods of spraying and supplying dampening water using spray nozzles have been proposed (for example, Japanese Patent Application Laid-Open No. 49-120704,
No. 59511, Japanese Patent Application Laid-Open No. 157359/1983,
(Japanese Unexamined Patent Publication No. 163780/1983).

However, in the above method, a large amount of dampening water is supplied to the roller portion corresponding to the spray nozzle.

The disadvantage is that only a small amount of dampening water is supplied to the middle part of the spray nozzle, and the amount supplied is uneven.

Therefore, it is necessary to install a large number of spray nozzles.
Cost and space requirements remain.

A first object of the present invention is to reduce equipment costs by reducing the number of spray nozzles when supplying dampening water to a lithographic printing press using the spray nozzles described above, and to This is done every time to ensure uniformity in the amount of dampening water supplied to the rollers.

The other objects are the same as the present invention, the applicant's invention] - Emulsification by adding water or alcohol to the '7 portion The present invention even provides a moisture supply device useful for the printing 7j method for destroying ink emulsifiers, and also provides one point of the present invention; The present invention also provides a water supply device which is useful for reducing losses by providing No. 31 alcohols.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a cross-sectional view of the spray device for a reprint printing press according to the present invention, FIG. 2 is a front view, and FIG. FIG. 4 is a sectional view showing another embodiment of the device according to the present invention.

The apparatus according to the present invention, as shown in FIGS. 1 and 2, is mounted on the rollers (1) of a 111 plate printing press.

The axes ζ of the rollers (1) are installed in parallel - at regular intervals? Water, such as water or alcohol, is sprayed from the spray nozzle (2) of the M a+ by air pressure at a rate of 31 M One with a horizontally long opening (3) on the part facing the surface, and one with a flat bottom hood (4).
), and if necessary, a spray nozzle (5) is provided near the opening (3), and the amount of spray at the location where the spray nozzle (2) is installed is 4. (1) This device is characterized by uniformly supplying dampening water to the surface by dispersing it from side to side. The hood (4) distributes the amount of spray from the spray nozzle (2) to the left and right, making it possible to uniformly supply dampening water onto the surface of (1) and distributing the sprayed moisture to the surrounding area. It is very effective in preventing scattering.

In addition, when it is necessary to increase the air pressure for spraying, the spray amount adjusting piece (5) is used, for example, when the spray nozzle (2) and 11-
If the distance δ1t from the hood (1) is long, the effect of the hood (4) may cause a problem in uniform supply, which can be solved by using the spray volume 11 joint (5) can..

The spray nozzle (2) is connected to a moisture supply vibrator and a pressurized air pipe for spraying (not shown).

Figure 3 Ik, the amount of water supplied to the glue surface when actually sprayed with the device shown in Figure 2 (solid line)
It is a graph showing the amount of water (dashed line) in the case without the hood (4) and the spray amount adjustment piece (5), and the amount of water in the case without the hood (4) and the spray amount adjustment piece (5). ) in the part corresponding to (It supply amount is large, and the supply amount in the middle part is small.For this reason, it was necessary to install two to three times the number of spray nozzles in the past.In contrast, the present invention It will be appreciated that according to the apparatus, the amount of moisture supplied onto the 9° 2-ra (2) surface is approximately constant.

In addition, moisture that has aggregated at the tip of the L portion of the opening portion (3) of the spray amount adjusting piece (5) may be blown off as water droplets, resulting in a partial oversupply of dampening water. For this reason.

In a preferred embodiment, a water receptacle (7) is provided at the end of the open LJ portion (3).

In addition, as shown in Fig. 4, there is also an outlet n (6) that guides the moisture that has condensed inside the hood (4) and the water receiver (7) to the outside.
It is preferable to provide The water from the outlet (6) can be recycled if necessary.

[Brief Description of the Drawings] Fig. 1 is a sectional view of the spray device for a lithographic printing press according to the present invention, Fig. 2 is a front view, and Fig. 3 is a hood and various parts of the roller with and without a spray amount adjustment piece. Figure 4 is a cross-sectional view showing an embodiment of the apparatus according to the present invention, and the main symbols in Figure 1 are as follows. - Roller, 2-Spray nozzle, 3-Open "1 part. 4-Hood, 5-Spray amount adjustment piece Patent applicant Co., Ltd. 1st year" Newspaper company Toyo Ink Mfg. Co., Ltd. 6-F diagram/Gonosen 3j prisoner λda 1 l-1-ra li ζ1

Claims (1)

[Claims] 1. On the surface of the roller of a lithographic printing machine, a constant interval of 4? is parallel to the axis of the roller. This is a device that sprays moisture such as water or alcohol using air pressure from a plurality of spray nozzles installed in the roller.
The above-mentioned device W62 is surrounded by a flat hood having a 1-L lower part, and is further provided with a spray amount adjusting piece if necessary near the opening. 2. The device according to claim 1, characterized in that a tapered, flat hood is used with narrower spacing. 3.-1- Install a spray amount adjustment piece in the lower flat hood opening.
-1. The device according to claim 1 or 2, characterized in that: