JPH05105296A - Transfer device of web - Google Patents

Abstract

PURPOSE:To provide a web transfer device removing a foreign substance such as powder and dust attached on an nonwoven fabric roller from the surface of the nonwoven fabric roller and preventing slippage of a web. CONSTITUTION:An nonwoven fabric roller is used for a bridle roller 12 to transfer a web 14, and simultaneously, air nozzles 16, 20 are furnished on the surface of the nonwoven fabric roller. Accordingly, as air blown out from the air nozzles 16, 20 is blown on the nonwoven fabric roller, a foreign substance such as powder and dust attached on the nonwoven fabric roller falls from the surface of the nonwoven fabric roller or is blown off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web transfer device, and more particularly, to a web transfer device that allows a web such as a metal strip material to travel stably by a bridle roller without slipping.

[0002]

2. Description of the Related Art As a roller for transferring a web, a pass roller mainly composed of a rubber roller is generally used.
Then, the pass roller is rotated at the same speed as the web, and the web is transferred without meandering. For this purpose, it is necessary to set the web tension to a certain value or more and to set the web tension to a certain value or less so as not to give an excessive strain to the web.

As described above, the following conveying rollers have been disclosed in order to set the web tension within a predetermined range. The first conveying roller is for conveying a steel plate and has a tread pattern on its surface, which is characterized in that the surface pressure is increased and entrained air is released (Japanese Utility Model Publication No. 59-61115).

The second conveying roller is characterized in that a nonwoven fabric impregnated with urethane is wound on the surface thereof to improve the holding power of the web (Japanese Patent Laid-Open No. 62-244613, Japanese Patent Laid-Open No. 1-33).
13246 publication). The third conveying roller is characterized in that rubber lining materials having different hardnesses are alternately arranged with a predetermined width on the outer circumference of the roller to improve the holding power of the web (Japanese Patent Laid-Open No. 63-108907). Publication).

[0005]

However, when the first transport roller is used for transporting the web, it is difficult to remove powdery substances and dust accumulated in the recesses of the tread pattern, and the tread pattern is also difficult to remove. If powdery matter, dust, or the like is accumulated in the concave portion of the above, there is a problem that the holding force of the conveying roller is reduced and the web slips.

Further, when powder or dust adheres to the second and third conveying rollers, the holding force of the conveying roller is reduced like the first conveying roller, and the web slips. is there. In particular, in the PS plate manufacturing process, since a matte layer is provided on the surface of the photosensitive layer in order to reduce the vacuum adhesion time during the exposure of the PS plate, the particles adhere to the surface of the bridle roller. As a result, the original holding force of the bridle roller is reduced and the web slips, causing scratches on the surface of the photosensitive layer and crushing the matte layer.

The present invention has been made in view of the above circumstances, and it is possible to prevent the slipping of the web by preventing the powdery material, dust, and the like from adhering to the surface of the conveying roller. An object is to provide a transfer device.

[0008]

In order to achieve the above object, the present invention provides a web transfer device in which a bridle roller for transferring a web is composed of a non-woven fabric roller, and air is applied to the surface of the non-woven fabric roller. It is characterized by having a means for ejecting.

[0009]

According to the present invention, the non-woven fabric roller is used as the bridle roller for transferring the web, and the air blowing means is provided on the surface of the non-woven fabric roller. Therefore, since the air ejected from the air ejecting means is blown to the non-woven fabric roller, foreign matters such as powdery substances and dust adhering to the non-woven fabric roller fall off from the surface of the non-woven fabric roller or are blown away.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a web transfer device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view of a web transfer device 10 according to the present invention. The web transfer device 10 has two bridle rollers 12. A non-woven roller is used as the bridle roller 12, the left bridle roller 12 rotates clockwise, and the right bridle roller 12 rotates counterclockwise. As a result, the web 14 is transferred to the right.

An air nozzle 16 is provided near the bridle roller 12, and the air nozzle 16 has a slit-shaped nozzle extending in the axial direction of the bridle roller 12. Therefore, the air ejected from the air nozzle 16 is uniformly blown to the entire width of the bridle roller 12. In this case, since a non-woven fabric roller is used as the bridle roller 12, foreign matter such as powder and dust adheres to the bridle roller 12 in a state where it can be easily removed. Therefore,
When the air is uniformly blown over the entire width of the bridle roller 12, foreign matter such as powder and dust falls off from the surface of the bridle roller 12 or is blown away.

FIG. 3 shows the holding force of the web of the bridle roller in terms of the coefficient of friction. As is clear from this graph, the holding force of the rubber roller is larger than that of the non-woven roller when there is no powder adhesion, but the holding force of the rubber roller is abrupt when the powder is present and the holding force of the non-woven roller is high. Will be higher. This is because powder tends to adhere to the rubber roller as compared to the non-woven roller, and the powder once adhered does not easily drop even if air is blown.

In the above embodiment, two bridle rollers 1 are used.
Although air is blown to No. 2, it is not limited to this and air may be blown to any one of the bridle rollers 12.
Although the slit-shaped air nozzle 16 is used in the above embodiment, the present invention is not limited to this, and an air nozzle having a round hole or the like may be used. Further, in FIG. 1, the air nozzle 16 that only ejects air is used, but as shown in FIG. 2, an air nozzle 20 having an exhaust mechanism in the web transfer device 18 may be used. The air nozzle 20 is provided with a suction port of an exhaust mechanism adjacent to the blowing nozzle. Therefore, foreign matter such as powdery matter or dust that has fallen off the surface of the bridle roller 12 by the air ejected from the nozzle or has been blown off is sucked from the suction port of the exhaust mechanism and reattaches to the bridle roller 12. This also prevents foreign matter such as powder or dust from falling and soiling the area around the bridle roller 12.

In FIG. 2, the same members as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

[0015]

As described above, according to the web transfer device of the present invention, a nonwoven fabric roller is used as the bridle roller for transferring the web, and the air jetting means is provided in the vicinity of the nonwoven fabric roller. Air can be blown onto the surface of the roller. Therefore, when air is blown onto the non-woven fabric roller by the air jetting means, foreign matter such as powder and dust adhering to the non-woven fabric roller falls off from the surface of the non-woven fabric roller or is blown away. This prevents the web from slipping.

[Brief description of drawings]

FIG. 1 is a side view of a web transfer device according to the present invention.

FIG. 2 is a side view of another embodiment of the web transfer device according to the present invention.

FIG. 3 is a graph of example data showing characteristics of the device of the present invention.

[Explanation of symbols]

 10 ... Web Transfer Device 12 ... Bridle Roller 14 ... Web 16, 20 ... Air Nozzle

Claims (1)

[Claims] 1. A web transfer device in which a bridle roller for transferring a web is composed of a non-woven fabric roller, comprising means for ejecting air onto the surface of the non-woven fabric roller.