JPH0320342B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a local exhaust system for a gravure printing machine, which is provided in an ink pad section of the gravure printing machine.

[Prior art]

Since ink for gravure printing uses an organic solvent such as toluene as its solvent, the organic solvent poisoning prevention regulations require that a local exhaust system be provided around the ink pad.

In order to improve workability, current local exhaust systems employ a downward suction system in which a pit is recessed in the machine installation surface and a grid is attached to the opening of the pit, and suction is sucked into the pit, and It was a side suction type with a suction duct inlet.

However, in order to efficiently suction from the entire ink pad, the so-called control distance becomes long, so it is necessary to increase the suction capacity to maintain the specified control wind speed (0.5 m/sec), which is uneconomical and Ta.

On the other hand, as shown in FIG.
0,101 is placed above, and the lower cylinder 10
There is a structure in which a suction duct 103 extending along the entire length of the side of the pickup 102 in which a portion of the water is immersed is attached, and this suction duct is connected to a main duct 104 in communication.

This allows air to be taken in efficiently from the entire ink pad 102, and there is no need to increase the wind speed. However, since the suction duct 103 is located on the working side, it obstructs the operator's field of view, resulting in poor workability. Furthermore, when replacing the cylinders 100, 101 and ink pads 102, it is necessary to move the suction duct 103 upward or remove it. Another problem is that it is not possible to perform suction.

In order to solve the above problems, a double hood type as shown in FIG. 2 has recently been developed. A ship-shaped hood 105 is attached to the ink pad 102 so that it can be raised and lowered by a lifting mechanism 106, and a duct 107 is attached to the side of the hood 105.
It is configured to be detachably attached. Although such a configuration is considered optimal as it can evenly suck ink from the entire opening area of the ink pad 102, the following problems still remain.

First, when replacing the cylinders 100, 101 and the ink pad 102, the duct 107 should be replaced with the hood 1.
After the hood 105 is removed from the hood 105, the hood 105 must be lowered by the lifting mechanism 106, which has the disadvantage of reducing work efficiency. Further, when the ink pad 102 is taken out, ink tends to leak, and this leaked ink may accumulate in the hood 105. In this case, since a flow rate adjustment plate is provided on the surface of the hood 105 to equalize the suction air volume, cleaning the leaked ink is also complicated, leading to a decrease in the operating rate.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to ensure that toxic gas can be discharged from an ink pad part, and to improve workability and maintenance/inspection efficiency.

[Structure of the invention]

The present invention has a local exhaust system for a gravure printing machine in which a hood top plate with an opening is formed into a flat plate, and a plurality of exhaust ducts are connected to the opening of the hood top plate through a separator for separating gas and ink. It is a continuous connection.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 is a plan view schematically showing the local exhaust system A according to the present invention, FIG. 4 is a partially cutaway side view of the same, and FIG.
The figure is a front view taken along the - line arrow in FIG. 3.

In the figure, 1 is the machine frame of a gravure printing machine installed on the floor G. Cylinders 2 and 3 are rotatably installed on both the upper and lower sides, and the film F is installed between the cylinders 2 and 3.
is supplied to the drying box 4.

Reference numeral 5 designates a dish-shaped ink pad that stores ink I therein, and is removably connected to a hood top plate 7 forming the lower limit of the exhaust space by means of a pedestal 6. The hood top plate 7 has a flat plate shape and has a receiving frame 8 on its lower surface, and the receiving frame 8 has a movable shaft 9 attached thereto that can be raised and lowered by being connected to a lifting mechanism such as a fluid cylinder.
This movable shaft 9 allows the ink pad 5 to move forward and backward in the direction of the cylinders 2 and 3, partially immersing the lower cylinder 3, and when replacing the cylinder 3, descending and moving the same cylinder 3 to the side. It can be taken out.

Reference numeral 10 denotes a doctor for removing excess ink on the non-operating side, and a rear shielding wall 11 is rotatably provided on the hood top plate 7 on the side where the doctor 10 is located, and a front shielding wall is provided on the other end side. 12 is installed so that it can be expanded and contracted.

As shown in FIG.
c, 12d are pivotally connected, and the second parallel frame 12c,
A slider 12e that can be slid on the third frame 12b is provided at the upper end of the third frame 12d, and the slider 12e can be configured to be retractable in the direction of the arrow in the figure, and vinyl or the like may be attached to each frame. In addition, as shown in FIG. 7, a cover 12f of plastic or metal plate, etc.
It may be configured such that it is hung on the third frame 12b. In any case, the front shielding wall 12 may be one that can be expanded or contracted, for example, it may have a structure in which both sides of the machine frame 1 are latched and the cover can be attached or removed.
This allows the cylinder 3 and ink pad 5 to be replaced easily.

As shown in FIG. 3, the hood top plate 7 is provided with a long opening 13 in the longitudinal direction of the hood top plate 7, and a gas-liquid separation chamber 14 serving as a separator for gas-ink separation communicates with the opening 13. are connected hanging down. A plurality of flexible small-diameter discharge ducts 15 are connected in communication with this gas-liquid separation chamber 14, and the discharge ducts 15 connect the ink pad 5 portion to a discharge chamber 16 disposed on the printing press installation surface G. It becomes connected.

As is clear from FIG. 3, the discharge chamber 16 connects the terminal ends of the plurality of discharge ducts 15 to converge the discharge flow path, and connects the main duct 17 provided outward from the installation line of the machine frame 1. However, a communication flow path to the main duct 17 is formed.

At the lower end of the gas-liquid separation chamber 14, an ink receiving box 18 is provided in the form of a drawer so as to face the opening 13 and can be taken out to the outside. established in Reference numeral 19 denotes a guide plate for exhaust gas disposed on the side of the communication opening 15a, which functions to bend the flow line of the gas into a U-shape.

In the above configuration, by driving a suction fan (not shown) provided on the downstream side of the main duct 17, the toxic gas near the ink pad 5 can be discharged toward the main duct 17 by the suction force. Front and rear shielding walls 11 and 12 are located at the front and rear of the ink pad 5, and the machine frame 1 is located on both sides, forming a double box structure that substantially includes the lower part of the ink pad 5. Therefore, since the ink pad 5 is surrounded, the gas-liquid separation chamber 14 draws a streamline that bends the toxic gas emitted from the ink pad 5 downward from the upper end surface side of the ink pad 5. can be efficiently sucked into the body.

In the gas-liquid separation chamber 14, overflowing ink induced into the exhaust gas flow and ink leaking when the impact 5 is taken out are collected in an ink receiving box 18. This is because the guide plate 19 is provided in the gas-liquid separation chamber 14, so that only the ink stays in the ink receiving box 18 due to the inertia based on the mass of the ink droplets when the ink flows downward during inflow. The exhaust gas flows around the guide plate 19 and continuously flows down into the exhaust duct 15.

As described above, all the ink that flows down along the exhaust gas flow is captured in the gas-liquid separation chamber 14, so it does not reach the downstream side of the exhaust duct 15, the flow path does not shrink due to hardening, and the ink is sucked. It can prevent a decline in ability.

Furthermore, a plurality of discharge ducts 15 are provided, and the openings 13 are arranged so as to cover substantially the entire length of the ink pad 5.
is provided on the hood top plate 7, so that uniform suction can be performed. Since the diameter of the discharge duct 15 is small, the hood top plate 7 can be easily lowered when replacing the cylinders 2, 3 and the ink pad 5, thereby improving work efficiency. Since the discharge duct 15 is made of a small-diameter flexible pipe, even if the elevating mechanism of the top plate hood 7 is complicated, the piping can be sewn to improve installation workability.

In addition, the above-mentioned replacement work and installation work can be performed without disconnecting the discharge duct 15 and the gas-liquid separation chamber 14, making maintenance and inspection easier.

Moreover, the height of the discharge chamber 16 connected to the discharge duct 15 is small, so that it can be inserted into the bottom area of the gravure printing machine, and the capacity of the apparatus can be reduced.
It can be easily adapted to all types of models.

Incidentally, the separator is not limited to the gas-liquid separation chamber 14, but a filter or a strainer S or the like may be detachably attached to the connecting portion of the discharge duct 15 as shown in FIG. This filter or strainer S can capture ink and prevent it from reaching the inside of the discharge duct 15.

Further, the opening 13 is not limited to an elongated one extending along the longitudinal direction of the hood top plate 7, but a plurality of small holes 13' may be formed at a required pitch in the longitudinal direction of the hood top plate 7, as shown in FIG. , a gas-liquid separation chamber 14' may be installed so as to communicate with each small hole 13'.

〔effect〕

The present invention achieves the following effects with the above configuration.

(1) Since the discharge duct is connected to the hood top plate below the ink pad, the duct does not protrude into the operator's work space and does not interfere with the operator's work.

(2) Since the hood top plate is flat, there is no problem in inserting and removing cylinders and ink pads when replacing them, improving work efficiency compared to conventional side suction hoods, and reducing the vertical stroke of the hood top plate. It is possible to reduce the height of the device.

(3) Since the discharge duct is connected to the bottom surface of the hood top plate, there is no need to disassemble the duct when replacing 2 above, and the work efficiency is higher than that of conventional methods.
Maintenance and inspection are easy.

(4) Since multiple discharge ducts are provided, the controlled wind speed in the long side direction of the ink pad can be maintained uniformly.

(5) Since a separator is provided to prevent ink from flowing down into the duct, the discharge flow path will not be reduced and the suction capacity will not be reduced.

(6) Since the duct is a small-diameter flexible pipe, it can be easily installed even if the mechanism for raising and lowering the hood top plate is complicated.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a side view schematically showing the main parts of a conventional local exhaust system, FIG. 3 is a plan view schematically showing a local exhaust system according to the present invention, and FIG. 5 is a front view taken from the - arrow direction in FIG. 3, FIG. 6 is a perspective view showing an example of the front blocking wall, and FIG. FIG. 8 is a side view showing another example of the separator, and FIG. 9 is a perspective view showing another example of the opening of the hood top plate. 1... Machine frame, 2, 3... Cylinder, 5... Ink pad, 6... Mounting frame, 7... Hood top plate, 8...
...Reception frame, 9...Movable axis, 10...Doctor, 11...
... Rear blocking wall, 12... Front blocking wall, 13... Opening, 14... Gas-liquid separation chamber (separator), 15...
...Discharge duct, 16...Discharge chamber, 17...
Main duct, 18... Ink receiving box, 19... Guide plate, F... Film, G... Floor surface, S... Strainer (separator).

Claims (1)

[Claims] 1. A flat hood top plate that is removably installed below the ink pad and can be raised and lowered, and a plurality of flexible discharge ducts that are communicatively connected to the openings provided in the hood top plate and communicate with the suction source side. A local exhaust system for a gravure printing press, comprising: a separator for separating gas and ink that is detachably provided at a connecting portion between the opening of the hood top plate and the discharge duct.