JPS6320663Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for connecting film strips used, for example, in automatic food packaging.

There are various automatic packaging methods as described above, but in continuous methods for foods, etc., a band-shaped packaging film is often used as the wrapping paper. For example, there is a packaging method in which a thermoplastic strip film is formed into a tube shape and fed into a filling section, the tube-shaped film is filled with the material to be filled, and then both ends of the filled section are sealed by heat welding. A film roll obtained by winding this into a paper tube is used for the band-shaped packaging film. In addition, in order to supply the strip-shaped packaging film seamlessly to the filling side and enable continuous packaging, two film rolls are set in the feeding device, and the packaging film on the one film roll that is currently being fed runs out. Sometimes, the end of this film is connected to the leading end of the packaging film on the other film roll. That is, as shown in Fig. 5, a colored vinyl tape B is pasted on the end side of the packaging film _A1 , or a sense mark (end mark) is printed in advance, or the end of the film is detected with a micro switch. This is detected by a photoelectric conversion device, etc., and the pre-supplied film A ₁ is detected as shown in Fig. 6.
and the subsequent supplied film _A2 are connected with double-sided adhesive tape C.

However, in the case of film rolls, when winding the band-shaped packaging films A ₁ and A ₂ around the paper tube D, it is necessary to fix the end of the winding start, in other words, the end of the above-mentioned film, to the paper tube D with glue. Therefore, as the film is pulled out, when this glued part is peeled off from the paper tube D, the paper on the surface of the paper tube is peeled off thinly (this is similar to the cellophane tape we use every day). (which can be easily understood if one considers what happens), the tail E seen in FIG. 6 is formed long enough to overlap the subsequent feed film A ₂ . Therefore, on the filling side, this overlapping film part is used for packaging, which has no value as a product at all.
The product had to be disposed of due to packaging errors, so to speak, and had the disadvantage of poor yield.

This idea was made in view of the above-mentioned circumstances, and it is possible to reliably prevent packaging errors caused by connecting the paper portions torn off from the surface of the paper tube, and to simplify the overall structure so that the ends of the films can be separated. An object of the present invention is to provide a band-shaped film connecting device that can continuously and efficiently connect parts.

In order to achieve the above object, the device for connecting film strips according to the present invention includes a pair of film rolls, a pair of drive rolls that pull out the film strips from each of the pair of film rolls, and a connection device that selects between the pair of drive rolls. A pair of belt-like films pulled out from a film roll corresponding to the preceding driving roll is provided with a clutch mechanism that can be rotationally driven in a reverse manner, and by driving one of the drive rolls in advance through this clutch mechanism, the pair of strip-like films pulled out from the film roll corresponding to the preceding driving roll are The clutch mechanism is operated based on detection of the end of the forcibly fed film strip to drive the other drive roll in subsequent rotation, and the film roll corresponding to the following drive roll is then forcibly fed out. A strip film connecting device configured to connect a leading end portion of the pulled out strip film to a rear end portion of the pre-feeding strip film with double-sided adhesive tape, the device being configured to connect the leading end portion of the pulled out strip film to the rear end portion of the previously fed strip film, the device comprising: The film tip pasting tool is internally held in a slightly more elastically protruding state, and a perforation blade is provided at a position adjacent to each of the pair of driving rolls, which can freely come into contact with and separate from the roll circumferential surface. A rotary perforation means is provided, and a brake means is provided in the film moving path between each drive roll and each film roll to clamp the film strip and prevent the film from being pulled out from each film roll. The present invention is characterized in that the perforation means and the brake means on the side of the preceding drive roll are sequentially activated based on the detection of the end of the precedingly fed strip film.

According to this invention, when one of the drive rolls is driven in advance to pull out and feed out a film strip from the film roll corresponding to the roll, the perforation means is first activated to detect the end of the film strip. by activating the means and bringing the means into contact with the drive roll to carve perforations in the film strip wound on the roll, and immediately after that, actuating the braking means to apply tension to the film strip, Since the strip film is cut at the perforation and the glued part after this perforation is separated, the glued part and the paper that is integrated with the part, that is, the tail E in FIG. 6, overlap the subsequent supplied film. It will not be sent to the filling section. Therefore, packaging errors do not occur, and continuous packaging with a high yield is possible.

An embodiment of this invention will be described below based on the drawings.

Figure 1 shows the overall structure, and 1 and 2 are strip-shaped packaging films (hereinafter referred to as films).
This is a film roll wound with A ₁ and A ₂ , and both rolls 1 and 2 are separated by a predetermined distance and are only freely rotated by a main body frame 6 . 3 is a drive roll for pulling out film A ₁ from film roll 1; 4 is a drive roll for pulling out film A 1 from film roll 2;
These are drive rolls for pulling out A ₂ , and these are supported between opposing frames 5a and 5b via roll shafts 3a and 4a, and these roll shafts 3a and 4a are
As shown in the figure, it passes through the frame 5b and the main body frame 6 and is taken out to the outside, and an idling gear 7 is attached to each end of the idling gear 7. The input is made to the intermediate roll shafts 3a, 4a. In other words,
The clutch slider 8 is a long groove 9 of the roll shafts 3a, 4a.
This sliding action engages and disengages the clutch pawls 7a and 8a, and the clutch mechanism 10 is constructed in this area. These drive rolls 3,
Film from both film rolls 1 and 2 for 4
A ₁ and A ₂ are led out via guide rollers 11a and 11b, wound into a curved shape, and then drawn upward through a small gap between both drive rolls 3 and 4, and then guided through guide rollers 11c and 11d. After that, it is sent to the forming device 12, for example. Further, fitting holes 3b, 4b as shown in FIG. 2 are bored in a part of the circumferential surface of each drive roll 3, 4, and the pasting tools 13, 13 shown in FIG. 4 are fitted into these, and The pasting tools 13, 13 are urged to protrude from the roll circumferential surface by the action of springs 14, 14 (shown in FIG. 2) installed in the holes 3b, 4b. Each drive roll 3,
Perforation means 1 is placed at the lower position of 4.
5,15 are equipped. This means 15, 15 has a blade 17 that rotates integrally with the rotating shaft 16, and an edge 17a for making perforations is formed at the tip of this blade, which inputs rotational force to the gear 18 shown in FIG. This rotation brings the film into and out of contact with the circumferential surfaces of the drive rolls 3 and 4, and at the time of contact, perforations are carved into the film wound around the circumferential surfaces of the rolls. The perforation engraving means 15 is the frame 5a, 5
It is fitted into a guide elongated hole 19 (shown in FIG. 2) opened in 6, and can be raised and lowered, and this means is supported by a coil spring 21 interposed between an adjustment screw 20 and a coil Adjust the elastic force of the spring 21 with the screw 2
By adjusting at 0, the blade 17 will be released with moderate pressure.
is in contact with the film. Further, in the middle of the film movement path from the guide rollers 11b, 11b to the drive rolls 3, 4, a pedestal part 22 is provided on the frames 5a, 5b, and a braking plate 23 that comes into contact with and separates from this is arranged oppositely. 23 is pressed against the pedestal part 22, both 2
A brake is applied to the films A ₁ and A ₂ that are inserted between 2 and 23. In other words, the brake means 24 is configured.

Next, to explain the operation, as shown in FIG. 1, film rolls 1 and 2 are set on the left and right, and one of drive rolls 3 and 4 is driven in advance, and film A ₁ is pulled out from film roll 1. ,
This is sent to the forming device 12 via guide rollers 11a, 11b, drive roll 3, and guide rollers 11c, 11d. The other drive roll 4 is in a stopped state, so the film roll 2
does not rotate, and its film A ₂ is guided by guide roller 1.
After being wound around 1a and 11b, the leading end of the film is temporarily fixed to the film leading end pasting tool 13 of the stopped drive roll 4. At this time, as shown in FIG. 4, about two small holes 26 are made in the leading edge 25 of the film, and a double-sided adhesive tape 27 is adhered to the leading edge 25 of the film from the side opposite to the pasting tool 13. According to this, the adhesive surface of the double-sided adhesive tape 27 comes into contact with the pasting tool 13 through the small hole 26, and the leading end 25 of the film is temporarily fixed to the pasting tool 13 using the double-sided adhesive tape 27. From this state, the amount of film on the film roll 1 gradually decreases, and when it finally approaches the end, the detection means 28 detects the vinyl tape B stuck to the end side, and based on this detection signal, it stops until now. At the same time that the clutch mechanism 10 on the drive roll 4 side is turned on (or after a slight time lag), the perforation means 15 on the drive roll 3 side is turned on. Then, the drive roll 4 pulls out the film A ₂ from the film roller 2, and the leading edge 2 of the film is thereby pulled out.
The double-sided adhesive tape 27 of No. 5 is in contact with the other film A ₁ , and both films A ₁ and A ₂ are connected. Also,
The edge 17a of the rotating blade 17 is the film
Touch A ₁ and carve a perforation on this. Immediately after that, the brake means 24 on the drive roll 3 side operates, and the film is placed between the pedestal part 22 and the brake plate 23.
Hold A ₁ to prevent it from being pulled out and apply tension to film A ₁ . Due to this tension, the film A ₁ is cut at the perforated part, so that the film A ₁ is continuously cut.
While A ₂ is pulled out and sent out, the end portion of the film A ₁ after being cut at the perforations is not sent to the forming device 12 . After that, a new film roll is set on the film roll 1 side, and the leading edge of the film on this roll is temporarily fixed to the laminating tool 13 of the drive roll 3 in the same manner as shown in _FIG. As it runs out, it is connected to the film _A2 in the same way via a double-sided adhesive tape, and the film connection and supply operation is repeated thereafter.

In addition, the brake plate 23 in the brake means 24
is formed on an arm 30 that swings around a fulcrum shaft 29 shown in FIG.
The swing control is performed based on the film end detection signal from the detection means 28, but it goes without saying that other structures may be used.

In addition, although the above embodiments have been exemplified to be used in a packaging machine, the present invention is not particularly limited in its use as long as the strip film is continuously used.

As is already clear from the above explanation, when this invention is used, by sequentially operating the perforations and the brake based on the detection of the end of the pre-feeding strip film, the pre-strip film on the feeding side is Tension is applied to the film part, and the tension can be used to cut the film at the perforated part, so that the paper part that has been torn off from the surface of the paper tube and continues at the end of the pre-feeding band-shaped film can be cut off and removed there. can. Thereby, it is possible to reliably prevent packaging errors caused by the paper portion peeled off from the surface of the paper tube being superimposed and connected to the starting end of the subsequent strip-shaped film. Moreover, according to this invention, it is possible to cut and remove the non-sheet portion by the perforation operation by the rotary perforation means and the subsequent operation of applying tension to the strip-shaped film portion by the brake means. For example, as disclosed in Japanese Patent Application Laid-open No. 124315/1983,
Compared to a structure in which the end portions of the new and old films, that is, the leading film strip and the trailing film strip, are cut at the same time while the running of the film is stopped, and then the front and back sides of both films are joined together, it is more expensive. In addition to simplifying the overall structure by eliminating the need for a mechanical mechanism, it is also possible to efficiently connect the ends of the film with very little downtime, that is, to make the film feed almost continuous. As a result, it has been found to be particularly effective in applications such as automatic food packaging.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of the band-shaped film connecting device according to this invention, Fig. 2 is an enlarged view of the main part, Fig. 3 is a cutaway view taken along the line shown in Fig. 2, and Fig. 4 is the film tip bonding part. FIG. 5 is a perspective view showing a state in which a vinyl tape for end detection is attached to a film roll, and FIG. 6 is a diagram for explaining the drawbacks of the conventional method. Explanation of symbols, A ₁ , A ₂ ... Strip film, 1,
2... Film roll, 3, 4... Drive roll,
10...Clutch mechanism, 13...Film tip pasting tool, 15...Perforation means, 24...Brake means, 27...Double-sided adhesive tape.

Claims (1)

[Scope of utility model registration request] It is equipped with a pair of film rolls, a pair of drive rolls that pull out a strip film from each of the pair of film rolls, and a clutch mechanism that can selectively drive these pair of drive rolls to rotate. The film strip drawn from the film roll corresponding to the preceding drive roll is forcibly fed out through the pair of drive rolls by the advance rotation of one of the drive rolls, and the end of the forcibly fed strip film is detected. By the operation of the clutch mechanism, the other drive roll is subsequently rotated, and the leading end portion of the film strip pulled out from the film roll corresponding to the succeeding drive roll is placed on both sides of the trailing end portion of the previously sent out film strip. A device for connecting film strips configured to be connected using adhesive tape, wherein a film tip pasting tool is internally held on each of the pair of driving rolls in a state that projects slightly elastically from the roll circumferential surface, and A rotary perforation means having a perforation blade capable of coming into contact with and separating from the circumferential surface of the rolls is provided at a position close to each of the pair of drive rolls, and each of the drive rolls and each film roll A brake means is provided to clamp the film strip and prevent the film from being pulled out from each film roll in the film moving path between the film rolls. 1. A device for connecting film strips, characterized in that the perforation means and the brake means are sequentially operated.