JPS588642Y2 - Sealing device in filling packaging machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a sealing device in a filling and packaging machine.
Specifically, the present invention relates to a sealing device that welds and seals continuously fed cylindrical packaging materials in the width direction at every position of a predetermined length to form a pillow-shaped envelope bag.

In the general pillow packaging machine illustrated in FIG. 1, the feeding roller 21 and the feeding roller 24 on the side of the feeding bed 23 work together in a manner that allows the speed to be increased/decreased, so that a strip is fed out from the required material roller FR. Bag making machine 2 based on continuous feeding of film F
2 is folded into a cylindrical shape while passing through the center seal device 25 (a roller whose speed can be changed to increase or decrease is shown).

) to seal the overlapping edges of the film F and form the cylindrical film F1, while the packaged object (also referred to as a work or article) is periodically supplied by the supply conveyor 26.

) W is charged (filled) into the cylindrical film F1 at equal intervals via the bag making machine 22.

Then, both F, , W (7) The end sealing device 27 on the feeding end side seals two places of the cylindrical film F1, that is, the parts corresponding to the front and rear ends of the workpiece in the width direction, and cuts the workpiece. One sealed bag F2 is formed and sent out by a delivery conveyor 28.

Such packaging originally depends on the film feeding speed and the sealing device 27.
This is done by setting the operating speed of However, as a practical matter, errors occur on the film side.

One of the reasons for this is that the film is continuously fed under the required tension, which causes elongation of the film itself, which accumulates during the packaging operation and causes large errors, especially towards the middle and end of packaging. As a result, the interval between registration marks varies, the timing of sealing on the cylindrical film is incorrect, etc., and various problems such as uneven lengths of packaging bags and misalignment between registration marks and seal positions occur. There was no sealing device that could adequately address the problem.

The present invention was devised to solve the above-mentioned conventional problems, and in a pair of sealing mechanisms installed on the way of feeding cylindrical packaging materials, they are arranged at equal intervals from each other taking into account the length of the bag. Non-interference (non-restriction) with the cylindrical packaging material for a predetermined period of time at each sealing time while the seal body is continuously moved at a constant circumferential speed.
The purpose of this sealing device is to effectively extend the sealing time for cylindrical packaging materials, and to feed the packaging materials at the same time as each seal. The purpose is to make it possible to change the feeding speed slowly or quickly, to form a very accurate seal under normal feeding, and to form a packaging bag with uniform seal position, length, etc.

The present invention will be explained below based on illustrated embodiments.

The sealing device of this example is implemented for the same purpose as the end sealing device 27 of FIG. 1, and as shown in FIGS. 2 and 3, the feeding line of the cylindrical film F1 (for convenience, the center line is shown).

) A pair of endlessly movable sealing mechanisms S, which are basically configured in the same way, above and below the middle.

S2 is installed.

Both mechanisms 81. S2 operates at the same speed as the basic speed of the cylindrical film in synchronization with the wrapping operation of the machine.
Two rows of endless chains 5, 5 are hung horizontally between the chain wheels 4, 4 at both ends of the driven shaft 3.3.

However, the distance between both shafts 1 and 3 is the same length, and each chain wheel 4 is the same diameter, and the tension side of each chain 5, 5 (the side facing the feeding line) is provided with an appropriate guide member (not shown). ) is almost horizontal.

Support members 6, 6 horizontally connected at equal intervals are used between the upper and lower chains 5, 5 to weld a suitable number (four each in the figure) of welding members (hereinafter also referred to as heating sill bodies).

) 7, 7 are arranged symmetrically. Each seal body 7,
7 are both in the shape of a horizontally long block, extending in the longitudinal direction to form a peaceful sealing surface 8 that is heated and kept warm by a heater 9, and a knife 10 is incorporated in the upper shield body 7. A groove 11 is engraved on the lower seal body 7.

The seal bodies 7, 7 are set as described below, and move together in synchronization for a predetermined distance (
For convenience, this is also referred to as the sealing process below.

) so that the sealing surfaces 8, 8 can be moved with the seal surfaces 8, 8 aligned and in contact with each other.

By the way, the contact position of both seal surfaces 8 is 1/1 of the film F1.
Take 2 heights as an example.

In the upper sealing mechanism 81, a pair of first and second guide members 12 and 13 for guiding knives are provided inside both chains 5 and 5.
are installed along the chain's trajectory.

Such a guide member has a first side 12 having a U shape as shown in FIG.
The second sides 13 each have a semicircular shape, but both have a U-shaped cross section to form a series of rail grooves 14,14.

However, in the first member 12 on both sides, as shown in FIG. An inclined rail portion 16 is formed.

A cam plate 17 for operating the knife is provided between the two parts 15 and 16 so that the two parts 15 and 16 are located approximately at the center of the sealing stroke as shown in the figure.

Each said knife 1 guided by said guide member 12.13
0 is a movable support rod 1 connected to the mounting part 10A with a bolt.
The rollers 19 at both ends of the seal body 7 can be moved together with the seal body 7 by being able to roll along the respective rail grooves 14.

Therefore, in the course of movement, each knife 10 is held in a resting state with its cutting edge immersed in the seal 8 at the portion where the relevant trochanter 19 is in rolling contact with the rail groove 14, and at the discontinuous portion 15, the blade tip is held in a resting state. As the child 19 is released, it is guided by the oblique cam edge 17a of the cam plate 17, so that the cutting edge protrudes from the sealing surface 8, and in the inclined rail section 16, as the trochanter 19 moves upward, It is set to go into hibernation again (see Figure 4).

The upper sealing mechanism S1 is entirely urged downward by a spring (not shown) to reduce the impact when the upper and lower sealing bodies 7, 7 align and abut.

The aforementioned sealing mechanism S1. In S2, the distance between the heating seal bodies 7, 7 (for convenience, the center of the sealing surface 8, that is, the distance between the cutting positions is exemplified).

) P is selected according to the target bag length,
In this example, as shown in Fig. 5, P=L=P1+2P2 is set based on the example of molding a bag F2 which is longer than the cylindrical film F1 with height and thickness (between the front and rear seal edges) and L with a thickness of There is.

However, it is assumed that P1 indicates the sealing stroke from the alignment start end S to the end end E of the eight comrades, and is equal to the distance between the axes.

P2: indicates a non-interference length up to a position where the sealing surface 8 does not contact (interfere with) the cylindrical film F1, based on each position of the alignment start end S1 and end end E.

This P2 is appropriately selected in consideration of the height H of the cylindrical film and the width of the sealing surface 8, and is approximately 30.
The arc length in degrees is illustrated.

Under these conditions, all sets of seal bodies 7 are set to be unrestrained with respect to the cylindrical film for a predetermined period of time during seal operation.

Therefore, in the sealing device of this example, both mechanisms S1. In the continuous constant speed operation of S2, the continuously fed cylindrical film can be sealed and cut at every pitch P. For convenience, the sealing operation for one bag will be explained with reference to FIG.

That is, as shown by the solid line in Figure A, the sealing body 7 of the preceding set aligns and abuts at point S, and the sealing stroke P1 reaches point E as shown by the imaginary line.
During the transfer, the first end seal is performed on the film F1, and the trochanter 19 and the cam plate 17 are sealed as described above.
The center of the seal edge is cut by a knife 10 operated with a knife 10.

At the end of such sealing, the sealing body 7 of the next set is located at the upper and lower part of the film F1, that is, 2 points from the point S, as shown in the imaginary line in Figure A.
It is located in front of P2 minutes (approximately 60 degrees).

Then, the sealing bodies 7 of the preceding group move away from the cylindrical film by 22 minutes from point E as shown by the solid line in the figure while rotating away from each other, and the sealing bodies 7 of the next group move from point S to point P.
Although it progresses to 2 minutes, 1,000 hands, it is still in a non-contact state with film F, and then it contacts at point S as shown in the imaginary line to start the second seal, and on the way, as described above, Make a cut to finish sealing, and place one bag F2 here.
Finish molding.

As is clear from such a sealing operation, the sealing process of 41 minutes can be taken as a sufficiently long effective sealing time when the cylindrical film is continuously fed.

Then, each set of seal bodies 7, 7 is placed at each point S after each seal is completed.
.

It is located 22 minutes behind and in front of E by a non-interference length, and sealing and cutting are repeatedly performed on the film F1 for a predetermined time while maintaining a non-interference (non-restriction) state.

Therefore, the amount of film fed per unit time can be adjusted by changing the film feeding speed using the above-mentioned non-interference period.

The speed change of the film can be easily and automatically controlled by the same conventional control method using the detector 29, feed roller 21, feeding roller 24, and sealing device 25 shown in FIG. Taking into account the misalignment of registration marks, for example, select a slow speed or half speed for the basic speed (i.e., a speed at which the amount of feeding per unit time is constant), and perform the feeding for each bag or bags at a time. .

This makes it possible to correct errors on the film side, such as elongation, displacement of registration marks, etc., and to perform accurate sealing operations under normal film feeding.

As a result, it is possible to form a bag with a uniform length L, and a bag with uniform sealing and cutting positions relative to the register mark.

In the sealing device to which the present invention is applied, it is sufficient to make the interval P between the sealing bodies 7 approximately the same length as P=P1+2P2.

In other words, as is clear from FIG. 5, the next set of seal bodies 7 requires P2 to match the height H of the cylindrical film, whereas in the preceding set of seal bodies 7, the front end of the cylindrical film is Due to the deformation, the non-interference state is reached earlier than 22 minutes, and at the end end E, there is no need to strictly consider the height H over the entire length of the bag, and the non-interference length p l= smaller than P2 can be closed.

Therefore, even if p2>p', .

In addition, in the illustrated sealing mechanism S, > S2, the illustrated sealing stroke P is determined by passing the chain 5.5 using a guide chain wheel placed at a location other than the tension side (sealing stroke side). It is possible to increase the total length of the chain and thus the seal mechanism while keeping the length of the chain longer, and it is possible to increase the number of seal bodies 7 installed.

As described above, the present invention is a sealing device for a filling and packaging machine that fills and packages articles at intervals into a continuously fed cylindrical packaging material, using a set of sealing devices installed on both sides of the cylindrical packaging material feeding line. In the continuous constant speed operation of the sealing mechanism, the sealing stroke from the alignment contact start point S to the end point E of the heating sealing body is along the feeding line, so that the sealing time for the cylindrical packaging material is long and effective. Since it can be removed easily, an appropriate seal can be achieved, and a good seal can be achieved using the minimum amount of heat required depending on the properties of the packaging material.

Moreover, regarding the interval P between all the seal bodies arranged in both sealing mechanisms, the position of the alignment contact start point S1 and end point E is determined by taking into account the sealing stroke P1 and the thickness H of the cylindrical packaging material. By setting the non-interference length P2 as a standard to the non-interference length P2, which is approximately equal to the sum of the non-interference length P2, a predetermined non-interference time with respect to the cylindrical packaging material is provided after each seal is completed. Seal operation can be performed continuously.

Therefore, by utilizing such non-interference time, the feeding rate on the packaging material side can be appropriately changed to adjust the feeding amount under continuous sealing operation that does not require any pauses or stops.

This eliminates the conventional problem mentioned at the beginning, that is, the feeding error on the packaging material side, enables accurate sealing operation under normal feeding, and efficiently produces bags of a fixed length and bags with the seal position aligned with the register mark. It can be molded well and the entire packaging operation can be made faster.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing a general bag-forming-fill-sealing machine, Fig. 2 is a front view showing a cross section of a sealing device according to an embodiment of the present invention, and Fig. 3 is m - ■ in Fig. 2. FIG. 4 is a front sectional view showing the essential parts of the same device, and FIG. 2... Chain wheel, 4... Chain wheel, 5...
...Chain, 7...Heating seal body, 8...
... Seal surface, Fl ... Cylindrical film, F2
...Packaging bag, W...Item, S...
...First seal mechanism, S2...Second seal mechanism, P...Interval between heating seal bodies, Pl...
...Sealing process, F2...Non-interference length, L...
...Bag length, H...Bag thickness, S...
...Start point, E...End point.

Claims (1)

[Scope of utility model registration request] A set of sealing mechanisms that are continuously operated at a constant speed corresponding to the packaging material are installed on both sides of the feeding line for the cylindrical packaging material that is filled with articles at intervals and is continuously fed by increasing and decreasing the speed as appropriate. In both mechanisms, a plurality of heating seals are arranged at equal intervals on an endless chain suspended between the drive and driven chain wheels, and the seal surfaces of each are aligned and abutted. The interval P between the heated sealing bodies is P1+2P2, that is, the sealing stroke P from the starting point S to the end point E of alignment of the sealing surfaces. , and a non-interference length P2 set based on the starting point S1 and the ending point E in consideration of the height H of the cylindrical packaging material. Seal device in machine.