JP2580877Y2 - Hot air cut-off device for web offset press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air cutoff device for an offset rotary press.

[0002]

2. Description of the Related Art In an offset rotary press, a dryer is provided for drying printed paper, and drying is performed by blowing hot air on the paper. Since the ink used for offset printing contains a solvent, it can be dried almost instantaneously by hot air. The printing paper that has been exposed to the hot air is sent to a cooling roll and cooled, thereby further enhancing the drying effect of the ink.

[0003]

Conventionally, since hot air generated from a dryer is sent to a cooling roll along both sides of a sheet, the hot air hits the cooling roll or the sheet cooled by the cooling roll. However, there is a problem that cooling by the cooling roll is hindered. Further, there is also a problem that the cooling roll is contaminated by being hit with hot air containing a solvent or the like on the cooling roll.

The present invention solves the above problems,
It is an object of the present invention to provide a hot air cutoff device in an offset rotary press capable of effectively preventing a decrease in a cooling effect due to hot air generated from a dryer hitting a cooling roll in the offset rotary press and the generation of dirt on the cooling roll. I do.

[0005]

Means for Solving the Problems The present invention achieves the above object.
Since Accomplish in the offset rotary press, between the dryer and cooling roll, and the hot air shut-off member disposed in proximity to both sides of the printing paper to be run, and hot air blocking member
Turn the hot air blocking member in the direction in which the distance to the printing paper changes.
And a support means for rolling rotatably supported, by hot air shut-off member, characterized by blocking the hot air sent in the direction of the cooling roll is produced from the dryer offset
An object of the present invention is to provide a hot air cutoff device for a rotary press. This
The hot air cutoff device further includes a heat
It has a wind recovery mechanism, and the heat blocked by the hot wind blocking member
Wind is collected by the hot air collection mechanism into the dryer.
It is desirable that the cross section of the hot air blocking member be substantially arc-shaped.
Preferably, it is formed.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an offset rotary press according to the present invention;

FIG. 1 shows an embodiment of a hot air cutoff device in an offset rotary press according to the present invention. As shown in the figure, in the present apparatus, a substantially arc-shaped gate plate 16 is provided between a dryer 12 and a cooling roll 14 of an offset rotary press.

[0008] As is well known, the dryer 12 is for drying ink by generating hot air and applying it to printed paper. The hot air is generated at a temperature of, for example, 230 to 270 ° C. in the dryer. In an offset rotary press, a heat-set ink containing a solvent is used.
Can be dried almost instantaneously by hot air from

The cooling roll 14 is composed of a plurality of rollers through which cooling water is passed. The printing paper 18 whose temperature is raised to about 110 ° C. by hot air is heated to about 110 ° C. by using a hot air cut-off device so that the paper surface temperature becomes 10 to 10. Since the temperature can be lowered by 20 ° C., the temperature can be lowered to about 90 to 100 ° C., and the cooling effect of the cooling roll can be enhanced. The cooling roll 14 converts the printing paper 18 to, for example, 30 to 40 ° C.
Cool.

The gate plate 16 is formed between the dryer 12 and the cooling roll 14 on both sides of the printing paper 18 in an arc shape. Gate plate 16
Are supported by a swing cylinder 20 and supported by an arm 22 rotatable in the direction of arrow A. The gate plate 16 prevents hot air generated from the dryer 12 and applied to the printing paper 18 from flowing toward the cooling roll 14, and is arranged close to the printing paper 18. Since the flapping of the printing paper 18 is about ± 5 mm,
The clearance of the gate plate 16 is set to about ± 7.5 mm.

The gate plate 16 is not limited to an arc-shaped one as shown in FIG. 1, but may have another shape as long as it can effectively block hot air from the dryer 12. For example, the cross section is not limited to a circle, but may be an ellipse or any other shape suitable for blocking hot air from the dryer 12.

According to the present apparatus, since the arc-shaped gate plate 16 is disposed on both sides of the printing paper 18 between the dryer 12 and the cooling roll 14, the dryer 12
The hot air generated from the air and sent toward the cooling roll 14 can be blocked by the gate plate 16. Therefore, it is possible to prevent the cooling and drying effects from being lowered by the hot air hitting the cooling roll 14.
In addition, since the ink and the like scattered by the hot air do not adhere to the cooling roll 14, the cooling roll 14 is not stained.

FIG. 2 shows another embodiment of the present invention. In this apparatus, an exhaust duct 24 is connected to the gate plate 16, and the exhaust duct 24 is connected to the blower 26 and the dryer 12. When drying and cooling are performed by the dryer 12 and the cooling roll 14, the blower 26 operates, and the hot air blocked by the gate plate 16 is sucked by the blower 26 and sent to the dryer 12 again through the exhaust duct 24. According to this device, the hot air cut off by the gate plate 16 is collected by the dryer 12, so that the hot air can be effectively exhausted and the hot air can be reused by the dryer 12.

[0014]

According to the device of the present invention, since the hot air generated from the dryer in the offset rotary press can be blocked from being sent to the cooling roll, the cooling effect of the cooling roll is prevented from being reduced. It is possible to prevent the cooling roll from being stained.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a hot air blocking device according to the present invention.

FIG. 2 is a view showing another embodiment of the hot air blocking device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Dryer 14 Cooling roll 16 Gate board 18 Printing paper 20 Rotating cylinder 22 Arm 24 Exhaust duct 26 Blower

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 23/04

Claims (3)

(57) [Scope of request for utility model registration] In an offset rotary press, between a dryer and a cooling roll, a hot air shutoff member is disposed in close proximity to both sides of a running printing paper, and a hot air shutoff member between the hot air shutoff member and the printing paper is provided. The distance changes
Means for rotatably supporting the hot air blocking member in a direction
A hot air cutoff device for an offset rotary press , wherein the hot air cutoff member cuts off hot air generated from the dryer and sent toward the cooling roll. 2. The apparatus according to claim 1, further comprising: a hot air collecting mechanism connected to the hot air blocking member, wherein the hot air blocked by the hot air blocking member is removed by the hot air collecting mechanism. A hot air cutoff device in an offset rotary press, wherein the hot air cutoff device is collected in the dryer. 3. The hot air cutoff device for an offset rotary press according to claim 1, wherein the hot air cutoff member has a substantially arc-shaped cross section.