JPS5819537B2 - Cutting device for opening in film packaging machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening incision device in a film packaging machine, and more specifically, a band-shaped film (including one made of aluminum foil) that is a packaging material.

This invention relates to a cutting device for forming an opening for opening a packaging bag in a packaging machine that fills and encloses an item in a bag formed by the following methods.

In this type of packaging machine, which is also generally called a pillow packaging machine, the technology for forming an opening for opening can be summarized as follows: (a) A roller installed in the middle of feeding the cylindrical film at the packaging section side. Make a cut in the vertical seal part using the model cutting device.

(b) Making a cut in the horizontal seal part using a cutting device installed halfway forward from the horizontal seal device.

However, it had already been adopted.

However, in the technique (a) above, the incision device itself is limited in space, in other words, it cannot take up a large space, and is limited to being incorporated between the vertical sealing device and the horizontal sealing device. larger pedestal and other equipment,
Complications in timing settings with the mechanism are unavoidable.

Moreover, if the cutting position is to be changed due to a change in pitch length for one bag, it is necessary to change the installation of the device itself or to replace the knife and roller with one that is compatible with each pitch. Not only is this extremely troublesome, the versatility of the device itself is low, and furthermore, it is impossible to improve the performance of the packaging machine.

In the technique (b) above, since the bag has an unspecified and irregular shape and posture due to the contents (items), it is extremely difficult to accurately cut into a specific part of the horizontal seal part.
Not only will the cut ends be irregular in position and size, but they will also cut deep into the bag other than the sealed area, leading to a partially opened state, making it impossible to keep the contents hermetically sealed.

Due to these problems, it could not be said to be a desirable and effective technology.

The present invention has been made in order to solve the above-mentioned conventional problem, and is newly installed in the middle of sending out a strip film, and requires a cut section for the strip film that is sent out in response to the steady operation of the packaging section. This is a cutting device designed to perform pitch processing.The purpose of this cutting device is to make a cutting edge in the forming of a cylindrical film or bag so that the cut is accurately formed and positioned at a predetermined part of the sealed portion of the bag. This allows the package to be opened cleanly and eliminates problems such as an increase in the size of the machine, a decrease in performance, and the occurrence of defective packages.

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

The apparatus in this example is an example implemented in a vertical pillow packaging machine.

First, the packaging operation of the packaging machine is shown in Figure 1. To summarize based on FIG. 2, the articles W in the hopper 1 are dropped into the supply tube 3 connected to the lower end of the tube 2 via the input tube 2 in fixed amounts by the regular opening and closing operation of the weighing device 38. On the other hand, the belt-shaped film F from the roll-shaped film body RF is reduced to the length of one bag by the synchronized regular feeding operation of the feeding roller 4 and the suction elevating type pull-out device 5 on the way to the supply cylinder 3. The bags are sent out at predetermined pitches that match the bag making machine 6 on the outside of the feeding tube 2, and are gradually folded into a cylindrical shape in the process of passing through the bag making device 6 outside the feeding tube 2. By the time it is fed along the outer periphery of the supply cylinder 3, it is already formed into a cylindrical shape.

Then, by the sealing operation of the vertical sealing device 7 having sealing mechanisms on both sides, the overlapped portions of both side edges of the cylindrical film,
The two left and right portions of the folded seal margin on the opposite side are vertical seal portions 81 and 82.

Next, the cylindrical film F1 is cut at two upper and lower places to form lateral seal portions S3 by the regular operation of the lateral sealing device 8 with the knife 9 below the supply tube 3.
It is molded as a bag F2 with seals all over its four peripheries so that the items W inside can be enclosed and packaged.

In such a packaging machine, the incision device of this example is newly installed in the process of feeding out the above-mentioned strip-shaped film F, more precisely in the middle of horizontal feeding before the feeding roller 4.

In the above-mentioned four-sided sealed bag F2, the cut end is effective even if it is located in any seal part, so in this example device, it is located in one vertical seal part (folded seal part) S2. A type in which a cut is made at the center of the width of the strip film F.

I will mainly give examples.

The apparatus of this example includes a manual movement adjustment mechanism A and a movable cutter mechanism C linked to this mechanism A, as shown in FIGS. 3 to 6.

First, in the movement adjustment mechanism A, a rotary screw shaft 11 and a guide rod 12 are both arranged horizontally in parallel in the film feeding direction between the bearing pieces 10 of the machine body B. The movable body 14 is fitted through the screw hole 15 and the through hole 16 and can be moved in the longitudinal direction of the film along both guide rods 12 as the screw shaft 11 is rotated in a fixed position by the operation of the bundle 13.

Note that 17 indicates a cover.

A holding frame 18 for guiding film insertion is installed on the movable body 14 described above.

This holding frame 18 may be either a fixed type or a movable type (in this example, a fixed type is shown for convenience), and is fixedly set with reference to a position corresponding to one side edge of the film. Directly connected guide corner rod 19 and corner rod 1
The plate 21 is connected in a cantilevered manner to the base plate 20 connected and suspended from the base end of the plate 9, and the plate 21 is formed to have a length of more than half in consideration of the maximum width of the film to be packaged. Both extend parallel to the width direction of the film.

Note that the plates 21 of the receiver are arranged in two pairs, the upper and lower, in the front and the front, and are both thin and lightweight, and are made of a rigid material that does not undergo vibrational deformation (bending fluctuation) during bending or film feeding. A comrade can insert and guide the film.

However, the plate 21 of the can holder may be made removable and replaceable, for example, with bolts or long holes (both not shown), and the width of the socket 22 formed by the interval between the sets may be adjustable.

On the other hand, the cutter mechanism C has a movable base 2 for moving the knife.
3 is fitted into the guide angle shaft 19 of the holding frame 18 through a square hole 24 and is fixedly held by a set screw 25, and a knife actuating cylinder 26 and a knife holder 28 are mounted on this base 23. Each is equipped with

The cylinder 26 is of an air double acting type, and its rod 21 extends below the movable base 23 through a hole and is removably connected to the holder 28.

The cylinder 26 is set to move up and down within a predetermined period of time during a pause in the film pitch feeding operation.

On the other hand, the knife holder 28 is in the shape of a horizontally long block in the width direction of the film F, and the movable base 28
3. The guide plate 29 attached to the lower surface of the base 23 is in contact with the guide plate 29 via the elevating guide surface 36, and the two rods are hung between the hanging plate 31 attached to the upper surface of the base 23 and extended. Supported by a tension spring 32, it is prevented from swinging back and forth and from side to side, and can be moved up and down smoothly.

A pair of knives 35 are slidably inserted into oblique support grooves 33 formed inside both sides of the knife holder 28 and fixed and held in a predetermined position by set screws 34.

Both knives 35 are formed into a rectangular shape,
The downwardly protruding blade portions of the holder 28 are adjacent to each other, and the blade edges 36 are oriented outward in the width direction of the film F, and the amount of protrusion of each blade edge 36, in other words, the interval between the blade edges is The length of the cut into the film can be adjusted by selecting the size of the cut opening 37.

(See the imaginary line inside the mouth in Figure 6) However, the knife 35 can also be used alone.

Therefore, in the cutting device of this example configured as described above,
A cutter mechanism C that can move in each of the longitudinal (feeding) and width directions of the strip-shaped film F is set at a predetermined cutting position on the film.

That is, in view of the bag F2 described above, the knives 35 with the incisions 37 held at a required interval are placed at a position corresponding to the width center of the film F having a predetermined width, as illustrated in FIG.
The rear position of the film corresponding to one pitch P corresponding to the length of the bag F2 is aligned with the rear position of the film.

However, regarding each pitch end position of the film in the horizontal feeding process, the feeding roller 4 for pitch feeding the film must be installed at a fixed position.

Colored marks M, which are used as a reference for the length of one bag, must be placed on the film in advance at equal pitches over the entire length.

Therefore, it is possible to accurately measure and read regardless of whether the roller position or the mark position is used as a reference.

Therefore, the knife 35 may be positioned and set using any of these as a reference.

After the knife 35 is set at the cutting position as described above, the cutting force can be continuously changed for each pitch by periodically operating the cylinder 26 in synchronization with the film feeding operation.

For convenience, to explain the cutting operation, during a short period of time when the film F is stopped being fed, the cylinder 26
As the knife holder 28 is lowered to a predetermined position along the guide plate 29 while tensioning the spring 32, the knife 35 is moved from the receiving part of the plate 21 in the movement adjustment mechanism A. The blade enters between the openings 22 and cuts the portion of the film held between the plates 21 with the cutting edge 3.
6, the incision can be made without difficulty until it reaches the lower end.

(See Figure 6 A) Thereafter, as the rod 27 rises, the knife 35 together with the holder 28 is quickly raised back to its original pre-operation position in a normal posture using the spring 32 (see Figure 6 (see), at this point - the cutting operation is completed, and the cutting process is performed in the same manner thereafter.

As a result, the cut portion of the film for each pitch is
As shown in FIG. 7A, two score lines CL of the same length are cut parallel to the width direction.

Then, the film which has been cut as described above is pitch-fed to the packaging section side and is sealed on all sides by the packaging operation, so that each of the above-mentioned cut lines CL are aligned with the bag as shown in Fig. 7A'. It is located at the folded seal part S2 of F2, and as a result, for all the bags, opening cuts are formed at the same part of the seal part by each cut line CL.

For example, when changing the pitch length for one bag, the cut position should be adjusted to the center or front in Figure 7 A, or when changing and using various films with different widths. If necessary, for any of the following:
The knife 35 in the cutter mechanism C is moved by the movement adjustment mechanism A.
The bundle 13 is moved along the guide rod 12 and the guide corner rod 19 in the feeding (longitudinal) direction and the width direction of the film, respectively, and is set at the required cutting position for each pitch, thereby achieving accurate cutting as described above. It is possible to make deep cuts.

In the apparatus of this example, the movement of the cutter mechanism C may be automatically performed using electrical and mechanical means.

Further, the receiving plate 21 may be provided integrally with the guide plate 29 on the cutter mechanism C side.

The device of this illustrated example may be modified as appropriate, and if the technique is applied, other vertical seal portions S1, horizontal seal portions S3
Each type of cut may be used for each type of cut.

In the former type, the illustrated movement adjustment mechanism A is installed at the center of the width of the film, and two cutter mechanisms C are placed on both sides.

As a result, cuts can be made on both side edges of the film corresponding to each pitch to form and position the cuts in the overlapping seal portion S1 of the bag F2 as shown in FIG. 7d.

In addition, in this bag, the above-mentioned folded seal part S2 must be
may not be necessary.

In the latter type, one movement adjustment mechanism A and two cutter mechanisms C are arranged like the former type, and the knife 35 of each cutter mechanism is turned 90 degrees relative to the illustration to film the film. Align in the longitudinal direction.

As a result, two cut lines CL are cut at symmetrical positions from the width center at each pitch end portion of the film as shown in FIG. .

Note that the bag F2 can be easily opened from any cut end.

When the device itself is of a type that can make the three types of cuts described above with one unit, the movable range is set to be effectively large for one movement adjustment mechanism A as described above. Two cutter mechanisms C are equipped on both sides, and in each mechanism C, a movable base 23 and a cylinder 26 are installed.
, the entire knife holder 28 and the like can be turned over 90 degrees.

In accordance with this, the support in the movement adjustment mechanism A is the plate 21.
As for the knife 35, it may be of a type that has a socket that fits the knife 35 and can be replaced and installed when the film is replaced, or it may be permanently installed with sockets in each direction formed in each part in advance.

This allows the required depth of cut to be made well.

As mentioned above, no matter which cutting type the device is used for, the shape of the knife 35, in other words, the shape and size of the cut end, etc., may be selected as appropriate, such as a single cutting line, a circular cutting line, or a circular cutting line. It may also be oval, diamond, etc.

It is also desirable to consider the directionality of the film. For example, if the bag is easy to open in the width direction, cut across the vertical sealing part S1 or S2, and if it is easy to open in the longitudinal direction, cut horizontally. It may be a vertical cut in the seal portion S3.

In this illustrated example, the explanation was given on the assumption that the cut is formed and positioned in a bag for directly enclosing and packaging an item, but in the case of a bag that forms the outer wrapper of a packaged product that has been wrapped in a book, the cut should be placed in the interleaving bag. Deep cuts may be made to the inside of the bag other than the seal area.

Furthermore, the cutting technique of this example can of course be applied to a film in which the packaging material is previously formed into a cylindrical shape and is fed in a strip.

As described above, the present invention is installed in the middle of feeding a strip of film as an opening device for a film packaging machine that seals a strip of film, molds the tube into a bag, and encloses the product. Therefore, even if the overall size of the device is to be increased, it can be easily incorporated into a required site with sufficient space, and can be implemented without being restricted or constrained by other mechanisms or devices.

Therefore, it is possible to suppress the packaging machine from increasing in size, and it is also possible to avoid complicating timing settings with other mechanisms.

Since the cutting operation is performed at the installation site of such a device prior to packaging at the packaging section side, it is possible to accurately cut a predetermined portion of the strip film in the most stable position in units of pitch. As a result, for all the bags in which the products have been sealed, the opening openings can be formed at predetermined positions in the seal portion with the same size and position.

Therefore, the bag can be kept in a sanitary and hermetically sealed manner without making deep cuts, and can be opened easily and cleanly.

In particular, in the device of the present invention, the knife of the cutter mechanism is movable in the film delivery direction by the movement adjustment mechanism, so even when the pitch length for one bag is changed, the knife can be moved for each pitch. By setting it at the desired cutting position, you can smoothly make accurate cuts.

Therefore, when changing the cutting position, there is no need to change the installation of the device itself or replace parts, and it can be quickly and easily handled by simply adjusting the movement adjustment mechanism, thereby increasing the versatility of the device itself. At the same time, it is possible to improve the performance of the packaging machine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIGS. 1 and 2 are a front view and a side view schematically showing a packaging machine, respectively, and FIG. 3 is a partially cutaway side view of the cutting device of this embodiment. Figures 4 and 4 are cross-sectional views taken along line 1'V-TV in Figure 3, Figure 5 is an exploded perspective view showing the cutter mechanism, and Figures 6A and 6 are explanatory diagrams illustrating the cutting state step by step. FIGS. 7A, 7A, 7A, 7A, 7A, 10B, 7A, 7A and 9B are explanatory diagrams illustrating the cuts in the film and the positions where the cuts are formed in the bag, respectively. 18... Holding frame, 21... Holder is plate, 2
6...Cylinder, 28...Knife holder, 35...Knife, A...Movement adjustment mechanism, C...Cutter mechanism, F・・・・・・
・Strip film, F2...Bag, CL...
- Cut line.

Claims (1)

[Claims] 1. In a film packaging machine that seals a film strip and forms it into a cylindrical bag and encloses an item therein, during the feeding of the film strip, there is a device that is connected to an actuating member and capable of cutting toward the film strip. A movement adjustment mechanism is provided for adjusting the movement position of a cutter mechanism having a knife in the feeding direction of the strip-shaped film, and the movement adjustment mechanism supports the cutter mechanism and moves in the width direction of the strip-shaped film. An opening incision device for a film packaging machine, characterized in that it includes a holding frame that can be connected to each other.