JPH0567483B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is an improvement that enables automatic (splicing) switching and feeding of raw film in an automatic bag-forming and packaging machine as disclosed in, for example, Japanese Patent Laid-Open No. 60-217933. The invention relates to an automatic bag making and packaging machine. [Prior art] A long flat film strip is automatically and continuously made into cylindrical film bags, the contents are filled into the cylindrical film, and then the individual packages are sealed at predetermined intervals. A typical example of an automatic bag-forming and packaging machine that continuously produces bags is, for example, ADP [trade name: manufactured by Asahi Kasei Industries, Ltd., automatic bag-forming and packaging machine, commercially available product]. The specific packaging mechanism for this product is, for example,
60-217933, and the invention described in the above publication describes matters to be considered in order to speed up the operation of this packaging mechanism to more than twice the current speed, and describes the operation for that purpose. Improving the mechanism, especially for packaging machines, can achieve ideal reciprocating motion by using any means to transmit the rotational motion transmitted from the electric motor, which is used for vertical or horizontal reciprocating motion. Discloses the following. On the other hand, Japanese Patent Application Laid-Open No. 60-99304 discloses that, in the same type of packaging machine, the terminal end of the film material currently in use is attached to the starting end of the film material to be newly supplied (using an adhesive tape). A description of a proposal to increase the operating rate of the packaging machine by making it possible to automatically change the raw material (estimated to be the same) and increasing the time that the packaging machine can operate continuously. There is. In fact, it can be said that increasing the speed of packaging machines is difficult to achieve unless the exchange of raw material is automated and operation can be continued. This is because the length of the original film is already at the limit for handling, and a significant increase in the amount cannot be expected, so if the speed of the packaging machine is doubled, for example, the original film will have to be replaced. The cycle is half the time of the conventional method, and in the intermittent replacement method where the machine is stopped each time and the film in the system is replaced, the cycle is half the time of the conventional method. The amount of product that goes unproduced due to proportional downtime has become more significant as the speed increases, and it is difficult to increase the speed of machines by ignoring this aspect. This is because it is becoming impossible to think. Therefore, the inventors of the present invention have also researched how film seams should be formed and how to make them in order to automatically change the original film, and have previously published Japanese Patent Application Laid-Open No. 63-55026 (Japanese Patent Application No. 1985-1987). , filed as Japanese Patent Application Laid-Open No. 63-55027 (Japanese Patent Application No. 198588-1988). These methods involve joining films together by thermal welding, and are characterized by the fact that the excess film beyond the seam on the side of the film to be newly supplied can be removed to remove the weld line, which makes it possible to remove the weld line from the film folder section of the packaging machine. For example, if these seams are used, they can be used to create seams that will not cause abnormal resistance (tension) when they are pulled or otherwise cause abnormal resistance (tension). It was thought that the automatic exchange of raw material would be perfected and that the speed of packaging machines would steadily increase accordingly. [Problems to be solved by the invention] However, in reality, failure phenomena occur such as interruption of operation due to seam breakage and bag breakage, and an increase in the incidence of bag breakage (puncture) during boiling, making it difficult to put it into practical use. A problem has arisen. These two defective phenomena, that is, the interruption of operation due to broken seams and broken bags, may be caused by the film that has been wrapped inside the packaging machine system coming off the system and the contents scattering and adhering to various places. This process involves a lot of effort and time to restore the product, and on the other hand, the frequent occurrence of punctures during boiling not only results in a complete loss of raw materials and labor, but also reduces the quality of food in the final product. This is a phenomenon that means that safety cannot be guaranteed.
Both of these can be said to be major obstacles to achieving higher speeds of packaging machines. It was also found that this phenomenon is controlled by another factor that is not directly related to the type of seam. [Means for solving the problems] In order to solve the above-mentioned conventional problems, the present invention has the following features:
A known automatic bag-forming and packaging machine that is commercially available or disclosed in patent publications includes a film feeding device F that controls the supply of a film strip of a required length, and a film feeding device F that controls the bending of the film strip into a cylindrical shape. This can be summarized as follows: A splicing device G, a film storage device H, and a film meandering position adjusting device B are arranged in this order between the folder 14. Hereinafter, the content of the present invention will be explained in detail using drawings and the like. FIG. 1 is a schematic diagram showing an example of an automatic bag-forming and packaging machine according to the present invention along with its processes, and is shown so that the roles and required functions of each process device can be understood. First of all, FIG _. 3 is a part illustrating the role and function of a conventionally known automatic bag making and packaging machine, which is adopted as is in the present invention. After that, Folder 1
4. In this folder 14, the band-shaped film F ₁ ″ is bent from approximately the center of the width of the band, and is further inserted into the folder 14 so that the width of the film covers the outside of the feeder pipe 15 for supplying the contents in the folder 14. guided by the film
Both side edges of F ₁ '' are bent into a cylindrical shape with overlapping parts. Then, when passing between the next fusion sealing devices 16 and 16', the overlapping film portions are fused and sealed to form a cylindrical film F. It becomes ₁ .
A feed pump 15' is inserted into the cylindrical film _F1 from above through a feeder pipe 15.
Wire ligatures 19, 19' are supplied to the portions to be ligated which have been squeezed at predetermined distances by squeezing rolls 18, 18'.
is applied and the packages are completed automatically in succession. FIG. 1 is a diagram of the apparatus of the present invention, which is a new addition to the conventional automatic bag making and packaging machine described above, which constitutes the main part of the present invention. Mainly from the reel mount 12 which supplies the required length _of strip-shaped film (hereinafter sometimes simply referred to as film) F ₁ ' or F ₂ ' from F 1 and F 2 ( _sometimes simply referred to as raw film). The terminal end of the film F ₁ ′ currently in use is placed between the film supply device F consisting of the film feeder F and the folder 14 that continuously bends the center of the film strip so that both side edges of the film strip overlap to form a cylindrical film. A splicing device G is in charge of joining the start end of the raw fabric _F2 to be newly supplied, and a group of multiple rolls whose inter-roll distance can be expanded and contracted, and the time required for the above joining is determined by the length of the inter-roll distance. A film storage device H is in charge of stockpiling film strips of necessary and sufficient length for the length of time, and a meandering running device is in charge of detecting a deviation (meandering) in the lateral position of the traveling film strip with respect to the running direction and correcting the position. The position adjustment devices B are arranged in the order of F, G, H, B, and 14, respectively. To explain the necessity in more detail from the required functional aspect, in the film supply device F, the film F ₁ ′ of the original film F ₁ currently in use is already about to reach its terminal portion, and a new supply is desired. In preparation for splicing the film strip F ₁ ′ to be fed out next, the starting end F ₂ ″ _of the raw film F 2 is placed in the splicing device G in advance.
It is pulled out to the top of the holder, and its tip is locked between the fixing plates 6 and 6'. FIG. 1 shows such a situation. Then, at the next moment, the final end of the film of the original film _F1 became free, the sensing roll 7 was activated, and the film began to run on each of the two pairs of pinch rolls 8, 8' and 9, 9'. Pinch the film to secure it. The timing is when the terminal end of the film _F1 does not pass through the pinch rolls 8, 8', but comes closest to them. Then, the overlapping portions of the films F ₁ ′ and F ₂ ′, which overlap each other by being fixed in this manner, are joined by a joining device G. The splicing device G generally consists of pressure plates 1 and 2, which control splicing or joining by pressing between them. In some cases, it means a simple press plate, in the case of fusion using a hot plate, it means a pair of heating plates, and in the case of high frequency heat fusion, it means a pair of electrode plates for applying high frequency. All of these require sufficient time to be pressed to prevent them from coming off at the seams. Then, during the pressing, the film strips F ₁ ′ and F ₂ ′
is fixed by the pinch rolls 8, 8' and 9, 9', so there is no supply from the original fabric side. On the other hand, since the packaging machine is in operation, it continues to consume the film F ₁ '. The film storage device H serves to cover the consumption of the film, in other words, to create sufficient pressing time for the above bonding, for example, the fixed rolls 10, 10', 10'', 10, 10''. A fixed roll group consisting of '' and a dancer roll 11,1
It consists of a combination of multiple roll groups as shown by 1', 11'', and 11, and usually the film is made according to the dimensions and distance between the fixed roll group and the dancer roll group suspended under a constant load. As mentioned above, when the film end is fixed and the film supply stops, the dancer roll group is lifted according to the excess tension applied to the film, and the roll group is The distance is shortened, and the film stocked in an amount corresponding to the film length to be consumed is released while maintaining a constant tension.Therefore, during the time period commensurate with the stocked film length, the film for replacement of the original film is released. This saves the time required for splicing without reducing the packaging machine's capacity.This stock length setting is used from the time film supply stops until the time film splicing is completed and film supply is restarted. It is calculated from the relationship between the time of storage and the necessary film length consumed by the packaging machine during that time, but it is desirable to set it with a margin of 30 to 50%. The strategy was limited by the ease of passing the film.
Rather than increasing the distance between rolls, a measure to increase the number of rolls in a roll group will be adopted. The installation of a meandering travel position adjustment device B, which will be described next, is particularly important. In other words, only after this device was installed could the film storage device H and the splicing device G described above be meaningfully installed and their functions effectively utilized. First, the mechanism of the meandering travel position adjustment device B is, for example, as shown in FIG.
and an adjustment device 22. This detector 20 is
It has the function of detecting the amount of deviation of the lateral position of the running film in the running direction from a predetermined position, and is generally a load cell type that detects by the amount of distortion.
Light-emitting diode type that detects by difference in light intensity,
Phototube style ones can be used. The amount of deviation is sent as an electric signal, which is converted into an electric quantity and amplified by the amplifier 21. The electric motor of the adjustment device 22 provided upstream of the detector 20 is actuated to adjust the length of the traveling film by the signal amount corresponding to the amount of deviation. Make a correction by shifting the lateral position in the opposite direction to the running direction. This position correction is accomplished by the electric motor changing the parallelism or levelness of the rolls, twisting the entire roll, or the like. [Function] The apparatus of the present invention can automatically replace the original fabric without causing failures such as interruptions in operation due to broken seams or broken bags, and an increase in the incidence of punctures during boiling. The reason why the present invention has such effects is as follows. The phenomenon of seam breakage is
This is because in the past, there was not enough time to form the seams, which made it difficult to select the type of seams and the degree of completion.
It is also presumed that the increased failure rate of bag breakage and punctures is due to insufficient attention being paid to countermeasures against meandering that occurs in running films. Especially regarding the latter, the apparatus of the present invention uses a larger number of rolls from the original fabric to the folder 14 than the conventional apparatus. Although care has been taken to maintain accuracy during finishing and installation of this roll,
Since there are a large number of rolls, there are many factors that can cause processing irregularities. Moreover, in this case, the magnitude of the instantaneous tension unevenness is unavoidable. On the other hand, the accuracy of the thickness and characteristic irregularities of the film brought in from the original side remains the same as before. If this is the case, if the meandering position adjustment device B is not installed, it is inevitable that the film will meander during film travel, especially at high speeds, and it will be carried directly into the folder 14 and made into a cylinder. However, due to the meandering of the film, there is an increased probability that the fusion seal line applied to the overlapping part of both side edges of the film strip will cross the edge of the overlap margin, or that part will be damaged during bag breakage and boiling. It is assumed that this is causing the occurrence of flat tires. In the present invention, the installation of the meandering traveling position adjustment device B greatly contributes to the smooth automatic switching and supply of the original fabric. From the viewpoint of preventing film meandering, a desirable splicing device G in the present invention is disclosed in JP-A-63-
No. 55026 (Japanese Patent Application No. 198587), Japanese Patent Application No. 1985-
As disclosed in No. 55027 (Japanese Patent Application No. 198588), a fusion bonding method is used in which the leading edge of the spliced films in the direction of film travel can be removed from the seam seal, thereby reducing tension fluctuations during running. On the other hand, the meandering position adjustment device B is equipped with a highly accurate device for correcting lateral positional deviations, such as a light-emitting diode that corrects deviations in the position of the side edges of the traveling film. It is desirable to adopt a device that captures the difference in light intensity (current) and amplifies it with a transistor to adjust the lateral position. [Example] A long belt-like film of vinylidene chloride resin with a width of 65 mm and a roll length of 1500 m/1 roll layer was used as the raw material, and with fish meat paste as the content, the diameter was 20 mm and the length was about 200 mm.
200 rocket-shaped packages (fish sausage)
Continuous production was carried out at a capacity of 1 book per minute. The packaging device used is shown in Figure 1 (Example of the present invention)
There were three machines: one in the comparative example shown in Fig. 2, and one in the reference example shown in Fig. 3. Note that each number and symbol in FIGS. 2 and 3 has the same meaning as in FIG. 1. Each of these devices will be explained. First, the common feature is that the packaging machines themselves located on the right side of each figure are unified to be high-speed type packaging machines, such as those disclosed in Japanese Patent Application Laid-Open No. 60-217933. Therefore, the data shown in FIG. 3 (reference example) indicates the technical level of this type of packaging machine. Next, the difference is that the splicing device G in Fig. 2 (comparative example) is different from that in Fig. 3 (reference example).
It also has a film storage device H. The device shown in FIG. 1 (invention) is different from the device shown in FIG. 2 (comparative example) in that it is further equipped with a meandering position adjustment device B. The following table summarizes the experimental results for the three machines mentioned above.

〔Effect of the invention〕

By having the above-mentioned structure, the present invention enables stable automatic switching of film material in an automatic bag-forming and packaging machine. This may be due to staffing problems due to the inability to completely automatically change over the material F of high-speed packaging machines whose capacity has apparently been increased, or the problem of time loss caused by manual changeovers. Since the problem of an increase in the number of defective packages (punks) is eliminated, the speed of the packaging machine has been increased for the first time in a practical sense by the device of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an automatic bag-forming and packaging machine according to the present invention along with its steps, and FIGS. 2 and 3 are schematic diagrams of packaging machines used in a comparative example and a reference example, respectively. 14... Folder, 15'... Supply pump,
16, 16'...Fusion sealing device, B...Meandering travel position adjustment device, F...Film supply device,
F ₁ ″...Band-shaped film, F ₁ ...Tubular film,
G... splicing device, H... film storage device.

Claims (1)

[Claims] 1. From the rolled layer film to the strip film
a film supply device F that continuously supplies F ₁ ″;
A folder 14 is in charge of bending the supplied film strip F ₁ '' into a cylinder shape so that both side edges of the film strip F ₁ '' are overlapped, and a folder 1
a fusion sealing device 16 that fuses both side edges of the overlapping film F 4 to form a cylindrical film F ₁ ;
16', a supply pump 15' for supplying the contents into the inside of the cylindrical film _F1 , and a sealing device that seals the cylindrical film _F1 filled with the contents into individual sealed packages. In an automatic bag-forming and packaging machine equipped with a film feeder F, which controls the supply of a film strip F 1 '' of a required length from a film roll in a wound layer state, the film feeder F feeds the strip film F ₁ '' so that both side edges of the film strip F ₁ '' are overlapped. A splicing device is connected to the folder 14, which is in charge of bending the film F ₁ ″ into a cylinder, and is in charge of joining the final end of the film currently in use with the starting end of the film to be newly supplied. G, and a film stocking device H which is made up of a plurality of roll groups whose inter-roll distances can be expanded and contracted and is in charge of stockpiling a strip-shaped film F ₁ ″ with a necessary and sufficient length corresponding to the time required for the above-mentioned joining with the length of the inter-roll distance. and a meandering traveling position adjusting device B which detects a deviation (meandering) in the lateral position of the traveling film strip F ₁ ″ with respect to the traveling direction and corrects the position. Automatic bag making and packaging machine.