JPH06135419A - Apparatus for preventing film from meandering - Google Patents

Abstract

PURPOSE:To obtain an apparatus for preventing a film from meandering which does not cause a wrinkle or the like on the film. CONSTITUTION:In an apparatus for preventing a film from meandering comprising a pair of rollers 15, 16 of a rotating roller and a follower roller rotating in pressure contact with the rotating roller for a device for carrying a film while it is interposed between the pair of the rollers, a differential pressure applying mechanism is provided which can apply a predetermined difference in pressure contact force between both ends of at least one of the rollers 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film meandering prevention device.

[0002]

2. Description of the Related Art A device for providing a pair of or a plurality of pairs of rollers for pressing a film or the like and conveying the film by the pair of rollers is widely known. The film is brought to various processes at the destination, but at that time, the film is required to have a regular position in the width direction, and if the position in the width direction is deviated, a problem occurs. For example, when the film is a packaging material, the bag is made by stacking the side edges while sealing the film and sealing the bag, and when the contents are filled in the film, the widthwise displacement is caused by the bag sealing. Make it defective or at least spoil the appearance.

An apparatus for correcting the above-mentioned deviation in the width direction with a forming plate that forms a sheet into a bag shape is disclosed in Japanese Patent Laid-Open No.
No. 111607. This known device, when sliding the film on the forming plate,
Rollers are provided at both side edge positions of the film so as to be freely rollable so as to press the film against the forming plate.

In this apparatus, when one of the rollers is brought into rolling contact with the roller, the contact pressure increases the friction between the film and the forming plate at the position of the one roller, and the moving speed is reduced. Will be attracted to. Thus, the position of the film in the width direction is adjusted by appropriately rolling one of the rollers.

[0005]

However, in the above-mentioned conventional apparatus, the rolling roller rotates at the same peripheral speed as the moving speed of the film, but the forming plate is stationary. Therefore, the frictional force between the film and the roller is small and the frictional force between the film and the forming plate is large at the position where the roller is in rolling contact. That is, even at the same position, there is a difference in frictional force between the front and back surfaces of the film. This causes a shearing force along the surface, which causes wrinkles and the like on the film.

An object of the present invention is to solve the above problems and to provide a film meandering preventive device in which the difference in frictional force between the front and back surfaces of the film does not occur at the same position.

[0007]

According to the present invention, the above object is provided with a pair of rollers including a rotating roller and a driven roller which is pressed against the rotating roller to rotate, and the film is conveyed by pinching the film between the pair of rollers. In a film meandering prevention device for a device to be installed, it is achieved by having a differential pressure imparting mechanism capable of imparting a predetermined difference to the pressure contact force at both ends of at least one of the pair of rollers. .

In this case, if a self-aligning type bearing is used as the bearing of the differential pressure imparting mechanism that supports both ends of the roller shaft,
Even if the roller shaft tilts when a difference in pressure contact force is applied, the shaft center of the bearing is automatically adjusted between the bearings at both ends according to the tilt of the roller shaft. Smooth rotation is possible without generating an excessive axial load.

[0009]

In the present invention having such a structure, when the film deviates from the regular position and approaches one side in the width direction,
The above-mentioned pressure difference imparting mechanism causes the pressure contact force at both ends of the roller to be different so that the contact pressure at the other side of the film is larger than that at the one side. When the contact pressure becomes large, the force of the roller pulling the film on the other side becomes stronger than that on the one side, and the film is attracted to the other side and returns to the other side. Further, in the present invention, since the pair of rollers for pressing the film rotate at the same speed, the same frictional force is applied between the front and back of the film at the same position of the film, so that the film is not wrinkled.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the schematic construction of an aseptic filling and packaging apparatus according to this embodiment. The apparatus of this embodiment, in the order of the steps, is a sterilizing section I for sterilizing a packaging film with a sterilizing solution, a meandering correcting section II for correcting the meandering of the film, a tubular film and a bag on which the contents are formed. And a product take-out section IV for filling and sealing the bag mouth.

What is filled in the tubular film here is a food that requires aseptic packaging, especially a fluid food.
Not only food but also grease for food industry can be filled. It is also possible to fill a pharmaceutical product that requires aseptic packaging, and the filling material suitable for film packaging is not limited to foods.

The sterilization section I is provided with a sterilization tank 1.
A film 3 drawn from a film original 2 rotatably supported below it is sterilized in the sterilization tank 1 while running. The sterilization tank 1 includes a sterilizing liquid storage unit 1A and a cleaning liquid storage unit 1
It is divided into B.

A heating roller 7 having a slightly larger diameter is rotatably disposed above the sterilization tank 1. The heating roller 7 has therein a heating means such as steam or electric heat. Thus, when the film 3 sterilized with the sterilizing liquid in the sterilizing liquid containing portion 1A passes through the heating roller 7, the sterilizing liquid attached to the film 3 is heated to enhance the sterilizing effect, and then the cleaning liquid containing portion 1B is used. It is designed to wash in the sterilizing solution by entering into.

A guide roller 11 for diverting and guiding the sterilized and washed film 3 and a large-diameter drying roller 12 adjacent to the guide roller 11 are rotatably arranged above the sterilization tank 1. The drying roller 12 has a built-in heating means for heating the roller surface to a temperature sufficient to evaporate the cleaning liquid remaining on the film 3. As the heating means, steam or electric heat can be used as in the heating means of the heating roller 7 described above.

The meandering correction section II includes a detector 14 for detecting the side edge of the film 3 or a printed mark while applying tension to the film 3 which has been sterilized, washed and dried in the sterilization section I by a tension roller 13. , A roller 15 and a correction roller 16 which is pressed against the roller 15 and is driven to rotate. The correction roller 16 is adapted to have a difference in pressure contact force at both ends by a differential pressure applying mechanism.

The detection method of the detector 14 may be electrical or optical, and there is no particular limitation and any other known method may be used. The detector 14 detects the deviation of the film 3 from the normal position in the width direction and sends the signal to a control means (not shown) for controlling the differential pressure applying mechanism for the correction roller 16. Further, the detector 14 is the film 3
It also has means for detecting a mark printed at a predetermined interval (corresponding to the length of one bag to be formed later) in the longitudinal direction, and for generating a signal for determining the rotational driving timing of the horizontal seal roller described later. You can also do so.

The correction roller 16 has pressing flange portions 16A and 16B formed by fitting elastic rings at positions near both ends, and the two pressing flange portions 16A and 16B are in pressure contact with the drive roller 15. There is. The correction roller 16
As shown in FIG. 2, based on the signal of the displacement of the width direction position of the film 3 which can meander in the detector 14,
The correcting roller 16 can be tilted about an axis 16Y perpendicular to the axis 16X. For example, when the film 3 is located to the right of the normal position in FIG. 2, a signal according to the amount of deviation detected by the detector 14 is sent to the control means, and the control means also receives this signal. As a result, the differential pressure applying mechanism is operated. The differential pressure imparting mechanism tilts the roller 16 to the left around the axis 16Y as shown by an arrow T so that the pressure contact force F ₁ of the left pressure flange portion 16A is greater than the pressure contact force F ₂ of the right pressure flange portion 16B. Also increase.
Therefore, the roller 1 rotating with the correction roller 16
The force for pulling the film 3 between the film 5 and the film 5 is larger on the left side, and the left side portion of the film 3 is strongly pulled, so that the entire film 3 moves to the left side and its widthwise position is returned to the normal position.

The principle of the operation of the meandering correcting portion has been described with reference to FIG. 2, but an example of a concrete configuration including the differential pressure applying mechanism is shown in FIG.
Will be described.

In FIG. 3, the film 3 is sandwiched between the flanges 16A and 16B of the correction roller 16 which is not driven on the drive roller 15 supported by a cantilever but is driven by the roller 15 and the roller 15 to sandwich both ends of the film. The vehicle runs in the direction of arrow F while being pressed. The differential pressure imparting mechanism has support arms 51A and 51B that support the correction roller 16 and cams 61A and 61B that pressurize the support arms 51A and 51B. Both ends of the correction roller 16 have support arms 51A,
It is rotatably supported by self-aligning ball bearings housed in the bearing portions 52A and 52B of 51B.

The support arms 51A and 51B are provided at the ends opposite to the bearings 52A and 52B.
The two support arms 51A, 51 are rotatably supported by an arm support shaft 53 penetrating A, 51B.
The distance between B is the support rings 54, 55, and 56, 57.
It is set so that it does not change due to.

Further, a cam shaft 60 which is parallel to the correction roller axis is provided between the correction roller 16 and the arm support shaft 53. The cam shaft 60 has cams 61A,
61B is installed. The cams 61A and 61B are attached to the camshaft in opposite directions to each other, and are fixed to the camshaft so as to be in positions where they slightly abut or lightly contact the upper surfaces of the support arms 51A and 51B, respectively.

In the meandering correcting portion thus constructed, when the camshaft 60 is rotated in the direction of arrow A or B by the control means (not shown), the cam 61A or 61B fixed to the camshaft 60 is supported. The arm 51A or 51B is brought into pressure contact with the correction roller 16 at 1 in FIG.
Tilt around 6Y is possible. Therefore, the flange portion 16A or 16B of the correction roller 16 is the roller 1
5, the end of the film 3 can be pressed strongly against the roller 15 and the meandering of the film can be corrected.

When the film does not meander and is in a normal running state, the cams 61A and 61B are set so as not to contact the supporting arms 51A and 51B, that is, in a neutral state.

Even if the correction roller does not have a pressing flange portion, it may be a straight roller having the same diameter as a whole, and the elastic member layer may be formed on the surface of at least both ends to obtain the same effect. Can be obtained.

Further, even if the correction roller is not provided with the elastic member, a layer of the elastic member may be formed on the surface layer of the roller which is rotated in pressure contact with the correction roller.

The filling section III has a function of making the film 3 into a bag shape and a function of filling the bag with contents. For this purpose, the filling section III is formed by bending the film 3 so that the side edges thereof overlap with each other and forming first and second forming sections 17 and 18, and a vertical seal roller for vertically sealing the side edges. 19, a horizontal seal portion 20 that horizontally seals after such vertical sealing to form one bag, and a filling nozzle 21 that receives contents from the outside of the apparatus and fills the bag with the contents.

The filling nozzle 21 receives the contents sent from an intermittently operating filling pump (not shown) and fills the inside of the bag, so that the opening tip of the filling nozzle 21 is a horizontal seal roller 2.
The bag formed by the lateral seals 3 and 23 faces the inside of the bag mouth opened above the lateral seal rollers 23 and 23.

The product take-out section IV includes a cutting section 25 and a discharging section 2.
And 6 are provided. The cutting portion 25 has a cutting blade (not shown) similar to that of the conventional device, although the detailed structure thereof is not shown, and the portion laterally sealed by the lateral sealing roller 23 is within the lateral sealing range. Cut and separate each bag containing the contents into a product. The discharging unit 26 is in the form of a chute, receives the products that have been separated and then drops, and sequentially discharges the products.

In the apparatus of this embodiment having such a structure, the filling and packaging are performed as follows.

1. Sterilize each part before starting the filling work. For that purpose, the original film is first passed through the sterilizing section I and then through a predetermined route to the meandering correcting section II, the filling section III and the product unloading section IV. Next, each part is sterilized, and then each part is dried to complete the preparatory work.

2. When such preparation is completed, the operation for filling and packaging is started. Both sides of the film 3 are sterilized by passing through the sterilizing liquid in the sterilizing liquid containing portion 1A. The sterilizing liquid attached to the film 3 is heated by the heating roller 7, and the sterilizing effect is further improved.

3. The film 3 is cleaned by passing through the cleaning liquid in the cleaning liquid storage portion 1B.

4. The film 3 on which a small amount of cleaning liquid remains adhered is heated and dried by the drying roller 12.

5. The film 3 dried by the drying roller 12 runs while being tensioned by the tension roller 13, and the detector 14 detects the widthwise position of the film 3 and issues a signal according to the amount of deviation from the normal position. . The control means (not shown) receives this signal and operates the differential pressure applying mechanism to tilt the correction roller 16 around the axis 16Y.

6. The correction roller 16 is, for example, a film 3
In FIG. 2, the pressing force F _{1 of the} left side pressing flange portion 16A is larger than the pressing force F _{2 of the} right side pressing flange portion 16B as shown in FIG. It is controlled so as to tilt around the axis 16Y. When the pressing force F ₁ becomes larger than F ₂ , the correction roller 16 and the roller 15 are pressed against each other and rotate together, so that the pulling force of the film 3 becomes larger in the left portion. Therefore, the film 3 gradually approaches the left side. Thus, the shift in the width direction is corrected.

7. The film 3 whose traveling direction is changed downward by the roller 15 is bent so that both side edges are opposed to each other, and then the film 3 is curved and sent to the vertical seal roller 19.

8. Both side edges of the film 3 are welded and sealed by the vertical seal roller 19 so that the film 3 has a continuous tubular shape.

9. After that, the tubular film 3
In synchronization with the detection of the print mark by the detector 14, the film is laterally sealed at the film mark position to form a bag.

10. A filling nozzle 21 faces the bag mouth of the bag thus formed, and the bag is filled with a fixed amount of contents from the filling nozzle 21 and the bag after the filling is filled by the next horizontal seal as the film runs. The bag mouth is sealed. This bag mouth seal also serves as a seal forming the bottom of the next bag.

11. After that, the continuous bags are cut at the transversely sealed portion in the cutting section 25 and separated into each bag to be a product.

12. Each product is removed from the discharge unit 26.

[0043]

As described above, according to the present invention, since the pair of rollers for correcting the meandering while conveying the film are rotating at the same speed, a difference in frictional force is generated between the front and back of the film at the same position of the film. Since it does not exist, wrinkles and the like do not occur in the film, and there is an effect that the appearance is not spoiled or defective products are not generated during bag making.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operating principle of a correction roller of the apparatus shown in FIG.

FIG. 3 is a perspective view of a differential pressure applying mechanism used in the apparatus of FIG.

[Explanation of symbols]

 14 Detector 15 Roller 16 Roller 16A, 16B Both Ends (Pressing Flange) 51A, 51B Differential Pressure Applying Mechanism (Support Arm) 52A, 52B Bearings 61A, 61B Differential Pressure Applying Mechanism (Cam)

Claims (6)

[Claims] 1. A film meandering prevention device for a device comprising a pair of rollers, a rotating roller and a driven roller that rotates in pressure contact with the roller, wherein the pair of rollers presses and conveys the film. A film meandering prevention device comprising a differential pressure imparting mechanism capable of imparting a predetermined difference in pressure contact force at both ends of at least one of the rollers. 2. The film meandering prevention device according to claim 1, wherein at least one roller has elastic portions at both ends. 3. The film meandering prevention device according to claim 1, wherein at least one of the rollers has a pressing flange portion at both ends thereof, and an elastic portion is provided on a surface layer of the pressing flange portion. 4. A detector for detecting the amount of positional deviation in the width direction of the film with respect to the normal running position of the film,
2. The film meandering prevention device according to claim 1, further comprising a control device for tilting at least one of the rollers via a differential pressure applying mechanism by an amount corresponding to an amount of deviation based on an output signal of the detector. 5. The differential pressure imparting mechanism has self-centering type bearings at both ends of the rotating shaft of one roller, and self-centering type bearings are applied, and an external force having a different value is applied to the housing frame of each bearing. The film meandering prevention device according to claim 1 or 4, wherein the film meandering prevention device is capable of being processed. 6. The film meandering prevention device according to claim 1, wherein the film is a film for food packaging.