JP2010143704A - Nip roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nip roller capable of restraining quality reduction and quality failure of a product caused by meandering, by carrying a web-like film nonuniform in thickness in the width direction without meandering as much as possible. <P>SOLUTION: This nip roller carries the web-like film while sandwiching the film betweem a driving shaft roller and a driven shaft roller parallel to the driving shaft roller. The driven shaft roller is constituted of at least two or more of independent rollers, and the rollers have respectively a bearing in a roller shell part or a roller shaft end, and have a mechanism capable of pressurizing the whole two or more of independent driven shaft rollers to the driving shaft roller. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nip roller that conveys a web-like film while pinching it between a drive shaft roller and a driven shaft roller parallel to the drive shaft roller.

  Generally, a film such as a polyethylene film is manufactured by an inflation method or a T-die method. Due to the difference in manufacturing method, it is known that the inflation method causes variations in the thickness in the width direction of the film as compared with the T-die method.

  When a single web-like film with a non-uniform thickness in the width direction is passed through a film processing machine, or when a multi-layer film that is not integrated is passed through a bag making machine, if it is transported with a nip roller, the film meanders. Will occur.

  Conventionally, many methods for correcting meandering that occurs during the conveyance of a web-like film have been proposed. The meandering of the film is detected by an edge guide using detection of variation in the amount of transmitted light by blocking the optical path due to variation in the film edge, or detection of blocking of airflow, etc., and the “rewinding reel method shown in FIG. (PAY-OFF) A method of correcting at the film unwinding part, or a winding part called "winding reel method (WIND-UP)" shown in FIG. A method of correcting meandering by moving, or a method of correcting meandering between driving rollers called “intermediate guide roll method (GUIDE ROLL)” shown in FIG.

Further, in the bag making machine, the thickness variation in the width direction is large, and there is a problem of meandering at a distance from the meandering correction means to just before the cutting means only by the method described above. Therefore, in Patent Document 1, as a method of preventing this meandering, after detecting the meandering of the film with a CCD (Charge Coupled Devices) camera, U-shaped guides are pressed against both edges of the film, Structures have been proposed that attempt to correct meandering by pushing in the opposite direction.
JP 2008-1000046 A

  However, the conventional method described above is a subsequent measure against the meandering of the film, and requires a large-scale device, so that the cost of the measure is expensive and it is difficult to install easily. Therefore, there is a demand for an apparatus that can reduce the meandering of the film and can be easily installed at low cost.

  The present invention has been made in view of such circumstances, and the web-like film having a non-uniform thickness in the width direction is conveyed without being meandered as much as possible. It is an object to provide a nip roller that can be suppressed.

The invention according to claim 1 of the present invention is the nip roller that conveys the web-like film while sandwiching the web-like film between the drive shaft roller and a driven shaft roller parallel to the drive shaft roller, and the driven shaft roller includes at least two driven shaft rollers. Consists of the above independent rollers, each roller having a bearing at the roller shell or roller shaft end, and a mechanism capable of pressurizing all of the two or more independent driven shaft rollers to the drive shaft roller It is a nip roller characterized by having.

  In the nip roller of the present invention, at least two or more independent rollers are driven shaft rollers in the nip roller that conveys the web-like film while being sandwiched between the drive shaft roller and a driven shaft roller parallel to the drive shaft roller. Each of the rollers includes a bearing at a roller shell portion or a roller shaft end portion, and has a mechanism capable of pressurizing all of the two or more independent driven shaft rollers to the drive shaft roller. . Therefore, even when a web-like film whose thickness is not uniform in the width direction is nipped, it escapes by the thickness of the film, and the nip interval of each driven shaft roller to the drive shaft roller changes, and it is applied to the width direction roller. The pressure is constant. Thereby, the crushing amount of the roller is constant in the width direction, and the film feed amount is also constant in the width direction. Thereby, it becomes possible to suppress the occurrence of meandering of the film.

  With a pair of nip rollers that are commonly used at present, when a web-like film with a non-uniform thickness in the width direction is nipped, the roller axis is tilted and the crushing amount of the roller is As a result, the film feed amount also changes in the width direction. As a result, the phenomenon that the film meanders occurred. As described above, in the nip roller of the present invention, without using a large meandering correction device, there is no product quality degradation and quality defect caused by meandering, product quality is improved, product reliability, equipment It became possible to improve the reliability of the.

  Hereinafter, a nip roller of the present invention will be described based on an embodiment with reference to the drawings.

  FIG. 2 is a schematic view of an example of the nip roller of the present invention. FIG. 3 is a view showing an example of the bearing arrangement of the nip roller of the present invention. 4 and 5 are views showing a conventional nip roller system. FIG. 6 is an example of film conveyance, and is a diagram showing the arrangement of nip rollers in a bag making machine.

  As shown in FIG. 2, the nip roller of the present invention has a drive shaft roller 2 connected to the drive shaft 5 and at least two independent driven shaft rollers 3, and all the driven shaft rollers 3 are It is parallel to the drive shaft roller 2 and is connected to each independent cylinder 1 so that it can be nipped from the same direction.

  The cylinder 1 that moves the driven shaft roller 3 so as to nip the drive shaft roller 2 needs to reciprocate up and down while keeping the driven roller horizontal to the drive roller, and has a bearing guide. The displacement in the rotation direction is prevented by using a cylinder that is used, or by providing a guide in addition to the cylinder, or by providing a plurality of cylinders.

  FIG. 3 shows the arrangement of the bearings 7 of the driven roller 3. FIG. 3 (a) shows a configuration in which the driven roller 3 is received by the bearing 7, and FIG. 3 (b) shows that the driven roller shell 4 is received by the bearing 7. The same result can be obtained in either form. As for bearings, rolling bearings are generally used because they are inexpensive and versatile, but sliding bearings can of course achieve the same effect.

FIG. 4 shows a conventional nip roller for film feeding. The driven shaft roller 3 is connected by a drive shaft 5 and a gear 8 and is rotated. Further, both ends of the driven shaft can be pressurized to the drive shaft by the cylinder 1. When a film having a non-uniform thickness in the width direction is niped in such a structure, the film moves in a direction in which the film thickness is thick, and as a result, a meandering phenomenon occurs.

  FIG. 5 is an example of a nip roller for film feeding used in a conventional bag making machine. As shown in FIG. 6, the nip roller contacts the bottom tape portion and the mouth embossed portion so that the bottom tape portion and the mouth embossed portion are not nipped when the bag-making film is conveyed. It is a mechanism that does not nip, either by denting or eliminating the part to be done. However, in the conventional nip roller, since the driven shaft roller is connected with the drive shaft and the gear as described above, the bottom tape portion 10 and the mouth embossed portion 9 of the film making film have other film thicknesses. Therefore, when the nip occurs, the amount of crushing of the film becomes unstable and the behavior of the film also becomes unstable. As a result, the film may meander. On the other hand, in the nip roller of the present invention, the driven shaft rollers are nipped independently and rotate independently, so that it is possible to cope with film thickness fluctuations and stable conveyance is possible.

Schematic which shows the meandering correction method of a web-like film. The schematic of an example of the nip roller of this invention. Schematic which showed the example of the bearing arrangement | positioning of the nip roller of this invention. Schematic which showed an example of the conventional nip roller. Schematic of an example of the nip roller for film feeding used for the conventional bag making machine. Schematic which showed an example of arrangement | positioning of the nip roller in a bag making machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder 2 ... Drive shaft roller 3 ... Drive shaft roller 4 ... Drive roller roller 5 ... Drive shaft 6 ... Drive shaft 7 ... Bearing 8 ... Gear 9. ..Mouth embossed part 10 ... Bottom tape part 11 ... Bag product

Claims (1)

In a nip roller that conveys a web-shaped film while sandwiching it between a drive shaft roller and a driven shaft roller parallel to the drive shaft roller,
The driven shaft roller is composed of at least two or more independent rollers, each of which includes a bearing at a roller shell or a roller shaft end, and all of the two or more independent driven shaft rollers are A nip roller having a mechanism capable of applying pressure to a drive shaft roller.

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