JPS5916363Y2 - Variable suction width suction drum - Google Patents

Description

[Detailed description of the invention] The invention of the present application relates to a suction drum that is variable during suction, and particularly relates to a suction drum that can transport a belt-shaped material sheet, etc. (hereinafter referred to as a web) without any trouble even if its width varies over a wide range. Regarding.

Conventionally, it is known that the web is conveyed by a suction drum, but when the width of the web changes over a wide range, the suction is constant in the known device, so if you try to convey a web narrower than that width, the drum will change. Since the suction holes directly face the atmosphere, outside air is sucked in from them, and negative pressure is no longer generated, making it impossible to hold and convey the web.

Conventionally, tape or the like was pasted on the opening of the outer cylinder of the drum facing the outside air on both sides of the web, but with this, it was necessary to stop the machine every time the web width was changed, and the sticky material of the tape was pasted on the outer cylinder of the drum. It was necessary to clean the outer cylinder every time.

The invention of the present application eliminates these drawbacks and provides a device that can automatically change the width of the web. Each compartment is connected to the blower via a valve, and the valves are opened and closed depending on the width of the web to be conveyed to control the flow of air within each compartment. This system sucks air individually and determines the section to be sucked according to the width and position of the web. Also, a web width detection device for opening and closing a valve such as a charge detection device is installed at the partition wall of the section. A device is installed to automatically control the valve according to the web width, and even if the web width changes, it can be switched automatically and instantaneously, and the blower load can be adjusted to the web width. It is economical because there is no need to use tape, there are no moving parts inside, so there is no failure, and the web reference can be set at one end of the device or in the center of the device. In this case, the main advantage is the suction drum device, which has many advantages such as being able to automatically and quickly respond to changes in web width.

To explain the attached drawings showing an embodiment of the present invention, FIG. 1 shows the appearance of the suction drum of the present invention,
1 is an inner cylinder, 2 is an outer cylinder having a large number of small suction holes 17, and 6 and 7 are openings provided in each section within the inner cylinder 1.

FIG. 2 is a cross-sectional view of the inner cylinder 1, and the interior is divided into sections 3, 4, and 4 by partition walls 9, 10. 5 is formed.

Each compartment has an opening 6, 7. 8 are respectively provided and communicate with the small holes of the outer cylinder 2.

and compartment 3 has tube 11. The compartment 4 communicates with the blower (not shown) via a valve 14, the compartment 4 communicates with the blower via a pipe 12 and a valve 15, and the compartment 5 communicates with the blower via a pipe 13 and a valve 16, respectively.

Also located at the walls 9, 10 are web width detection devices, for example photoelectric devices, for controlling the valves 15, 16, respectively.

Now, when the web reference is set at position A at the left end of the drum in the figure, when the web is narrow, valve 14 is opened to suck air from compartment 3, and valves 15 and 16 are closed.

If the width of the web becomes wider and covers sections 3 and 4,
Open valves 14 and 15, and in the case of gold mine web, make sure to open all valves.

Therefore, it has been possible to obtain a drum having a drum completely free from the drawbacks of the conventional apparatus as described above.

Also, when the web width standard is set at position B at the center of the drum, when the web is narrow, only valve 15 is opened to suck air from section 4, and when the web is wide, valves 14, 15, and 16 are opened. Make sure to open all of them.

When the web width is set at the center of the device, another embodiment as shown in FIG. 3 can be used.

That is, chamber 3 is connected to the blower through pipe 11' and valve 14', chamber 4 is connected to the blower through pipe 12' and valve 15', and chambers 3 and 5 are connected through communication pipe 13'.

Then, when the web width is narrow, the valve 14' is closed, and when the valve 15' is opened, air is sucked only from the chamber 4 and the web is sucked and conveyed.

When the web is wide, if both valves 14' and 15' are opened, the air in chamber 3 will be sucked in through pipe 11' and valve 14', the air in chamber 4 will be sucked in through pipe 12' and valve 15', and the air in chamber 5 will be sucked in. is suctioned from the tube 11' via the communicating tube 13' and through the chamber 3, and air is suctioned from all compartments.

In FIG. 2, when the width of the web is based on the left end A of the drum, when the web exceeds the position of the wall 9, the detector is activated and the valve 15 is opened, and when the web exceeds the position of the wall 10, the detector is activated. Then, the valve 16 opens.

The width of the web can be detected not only by installing a detector on the wall of the drum as described above, but also by installing a detection means on the upstream side of the drum to detect the width of the web using, for example, an air pressure detection means before the web reaches the drum. The valve may be operated by detecting the

Since the invention of the present application is constructed as described above, it is possible to suction a desired width at a desired position independently of the necessary section, whether the web reference is set at one end of the drum or at the center of the drum. Switching can be performed automatically and quickly, and since there are no movable parts, it is possible to obtain a variable suction drum during suction that is trouble-free.

[Brief explanation of drawings]

FIG. 1 is an external view of the suction drum, FIG. 2 is a sectional view of the inner cylinder, and FIG. 3 is a diagram showing another embodiment. Explanation of symbols: 1... Inner cylinder, 2... Outer cylinder, 3,4°5... Division, 6. 7. 8...
...Opening, 9,10...Partition wall, 11.12
．． 13.11', 12', 13'...tube,
14.15°16, 14', 15'...Valve,
17... Small hole in the outer cylinder.

Claims (2)

[Scope of utility model registration request] (1) In a suction drum, the interior is divided into several compartments in the axial direction, and an inner cylinder with an opening in each compartment is covered with an outer cylinder having a large number of small suction holes. A suction drum that is variable during suction, characterized in that it is connected to a blower through a suction drum so that air in each compartment can be suctioned independently. (2) A billing drum characterized in that a conveying web width detecting device for opening and closing a valve is provided at a wall that partitions each section of the inner cylinder.