JPH0213281Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a folding part forming device for a bag sealing machine, more specifically, a folding part forming device for a bag sealing machine for sealing a top-opening type bag made of synthetic resin. The present invention relates to a fold-in part forming device for forming a fold-in part in the upper part of a bag after storage and immediately before sealing for sealing the opening.

Conventionally, a folding part forming device for this type of bag sealing machine has been developed, which applies pressure from the outside of the bag and presses the bag into a molding machine that conforms to the shape of the bag to form the folded part. However, this device had the following drawbacks.

(b) In other words, a device to apply pressure from the outside of the bag and a molding machine are required, which not only increases the number of parts and complicates the structure, but also increases the manufacturing cost of the entire device. There were flaws.

(b) A more important point is that since pressure is applied from the outside of the bag, it is difficult to maintain the shape of the upper part of the bag to be folded during the folding operation, and moreover, as shown in FIG. It was not possible to smoothly and reliably form the fold lines at each of the three fold lines, especially the center fold line H' which is the most important in forming the fold part G', and therefore the fold part could not be formed reliably. Therefore, if the opening of the bag is sealed in this state, there is a fatal drawback in that the folded portion formed after sealing becomes uneven, resulting in a very unsightly appearance of the bag.

(c) Moreover, as mentioned above, the folded part cannot be formed reliably, so even if the opening is sealed in that state, the film will shift and the flap formed by the seal will be damaged. It had the disadvantage of being uneven.

In order to eliminate all of the above-mentioned drawbacks, the present invention focused on the fact that the folding process could not be performed reliably because the folding part was conventionally formed by pressure from the outside, and the folding process was improved. This was devised with the aim of ensuring that the bag is sealed without any uneven folding at the folded part after sealing, and without uneven edges caused by sealing, so that the appearance of the bag after sealing is maintained. It is an object of the present invention to provide a completely new and useful folding part forming device for a bag sealing machine, which has good quality, has a simple structure, and can be manufactured at low cost.

In order to achieve this purpose, the present invention connects a suction port for performing suction from the outside with four suction holes for suctioning the side and front surfaces of the bag body. This device relates to a fold-in part forming device that has a hole in the bag, and the fold-in part forming device is inserted into the upper part of the bag in which the product is stored, and at the same time, a hose or the like is attached to the suction port and the When suction is performed, the air inside the bag is sucked out through the four suction holes that communicate with the suction port, and both sides and the front back of the upper part of the bag are sucked inward and attracted to the main body of the device. As a result, the folded portions can be reliably and quickly formed on both side surfaces of the bag.

In other words, the present invention has made it possible to perform the folding section forming operation, which could conventionally only be done by pressure from the outside, by suction and suction from the inside.

As mentioned above, this invention makes it possible to suction the bag to the main body of the device while removing the air inside the bag using the suction holes for suctioning the front back and both sides of the bag. A remarkable effect has been obtained in that the shape of the upper part of the bag body is maintained during the folding operation, and thus the folded portion can be formed very reliably and extremely quickly.

In particular, since the center of the side surface of the bag is directly sucked into the main body of the device by a pair of side suction holes for suctioning both sides of the bag, the center fold line, which is the most important in forming the fold, is especially It was possible to form it smoothly and reliably. Furthermore, since the folded part is formed reliably as described above, there will be no uneven folding at the folded part even after the opening is sealed, that is, after sealing.Moreover, since the air inside the bag has already been removed, the film will remain intact. It does not bulge out,
As a result, the bag has a particularly remarkable effect that the appearance of the bag after being sealed is very good.

Furthermore, as mentioned above, since the folded portion can be reliably formed by suction from the inside, there is a particular advantage that the edges produced after sealing will never be uneven.

Furthermore, compared to conventional methods that require a device that applies pressure from the outside and a molding machine installed inside the bag, the present invention uses only one device for suction to form the folded part. Since it becomes possible to form the device, the structure becomes simpler than before, and the number of parts can be reduced, which has the practical benefit of significantly reducing the manufacturing cost of the device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below according to an embodiment shown in the drawings.

Fig. 1 is a side view of a folding part forming device in a sealing machine as an embodiment, Fig. 2 is a plan view, Fig. 3 is a sectional view taken along the line X-X of Fig. Y-
A Y-line sectional view is shown respectively.

In FIGS. 1 to 4, reference numeral 1 denotes a main body of the folding part forming device made of metal, and a top plate 2 having a substantially rectangular planar shape;
A substantially elongated rectangular neck portion 4 having a hollow portion 3 inside
and a body section 7 having a substantially square shape from the front and having a hollow section 6 that communicates with the hollow section 3 of the neck section 4 through a communication hole 5.

Reference numeral 8 denotes a substantially circular suction port for performing suction from the outside, which is bored approximately in the center of the top plate 2 and communicates with the hollow portion of the neck portion 4 . Reference numerals 9 and 9 denote a pair of substantially V-shaped grooves formed to follow the shape of the folded portion of the bag, and are formed at the lower side of the body 7 of the device main body 1. Reference numerals 10 and 10 designate a pair of slit-shaped side suction holes for suctioning both side surfaces that are to form the folded portions of the bag body, which are located in the center longitudinal direction of the lower side of the body 7 having the grooves 9, 9. It is drilled in.
11, 11 is 1 for suctioning the front back part of the bag body
A pair of slit-like suction holes on the front and back side of the body 7
Perforations are made laterally on the front and back sides of the Both the front suction holes 11, 11 and the side suction holes 10, 10 communicate with the suction port 8 through the hollow portions 6, 3 of the body 7 and neck 4. Reference numerals 12, . . . designate mounting holes for bolt mounting, which are bored at four corners of the top plate 2.

FIG. 5 is a perspective view showing the installation state of the apparatus main body 1 as described above, and in the figure, reference numeral 13 indicates approximately L-shaped bolts attached to the upper surface of the top plate 2 of the apparatus main body 1 by bolts 14, . It is an elevating plate, and is configured to be able to be raised and lowered by lifting and lowering rods 15, 15 provided on its rear side by means of a cam action. Reference numeral 16 denotes a suction port that matches the suction port 8 of the device main body 1, and the elevating plate 13
It is drilled approximately in the center of the And this suction port 1
6 and a suction hose 17 to the suction port 8 of the device main body 1.
is inserted through the suction hose 17, and a blower 21 is provided via the suction hose 17.

The folding part forming device having the above-mentioned structure is provided in a bag sealing machine 18 as shown in FIG. 6, so that it can be raised and lowered in the section A shown in the same figure. In FIG. 6, reference numeral 19 indicates an input port for the bag.

Next, the operation of the folded portion forming device having the above-mentioned configuration will be explained.

First, when the top-opening bag B made of thermoplastic synthetic resin containing the product C is put into the sealing machine 18 through the inlet 19 shown in FIG. 6, a limit switch (see FIG. (not shown) is pressed against the bag body B and operates, whereby the loaded bag body B is intermittently transferred in the direction of arrow A in FIG.

When the bag B is transferred to the section A in FIG. 6, the upper part of the bag B in which the product C is not inserted is suctioned up by a suction machine (not shown), and then raised and lowered by the cam action. The apparatus main body 1 of the gazette forming apparatus is lowered via the rods 15, 15 and the lifting plate 13, and the body 7 of the apparatus main body 1 is inserted into the upper part of the bag body B containing the product C, as shown in FIG. do. In this case, the speed and time interval for raising and lowering the main body 1 of the apparatus are set in advance in accordance with the speed at which the bag B is moved in the direction of arrow A.

Next, in this state, attach the seventh
As shown in the figure, the side surface side of the bag body B is supported by pressing it with the pressing bodies 20, 20, and in this state, the suction drive unit (not shown) is operated, and the main body 1 of the apparatus is When the inside of the hollow parts 3 and 6 is sucked through the suction port 8, the side part D of the upper part of the bag body B is moved inward, that is, toward the apparatus main body 1 by the side part suction holes 10 and 10 communicating with the hollow parts 3 and 6. At the same time as being sucked, the front back parts E and F of the upper part of the bag body B are connected to the hollow parts 3 and 6.
It will be sucked inward by the suction holes 11, 11 on the front and back side that communicate with each other. Also, at this time, the air in the upper part of the bag body B is drawn out by the suction action. As a result, the bag body B has its side parts D, D and front back parts E, F attracted to the body part 7 of the main body 1, as shown in FIG. Folded portions G, G will be formed in. In other words, since the upper part of the bag B is sucked inward and adsorbed to the body 7, the folded portions G can be formed more reliably than in the conventional folded portion forming operation performed by external pressure. It will be carried out in In this case, since approximately V-shaped grooves 9 are formed on the side surface of the body 7 of the apparatus main body 1, the bag body B to be attracted
The side parts D, D of are folded in along the shape of the groove parts 9, 9, making it easier to form the folded parts G, G. Moreover, the center fold lines H, which are most important in forming the fold parts G, G, are directly attracted to the side suction holes 10, 10, and are formed very smoothly and reliably. Moreover, in this case, the front back part E of the bag body B,
Since F is also sucked into the suction holes 11, 11 on the front side of the main body 1 and adsorbed to the side of the main body 1, the front side E,
The shape of the upper part of the bag body B is reliably maintained without causing F to unintentionally expand.

After the gazette parts G, G are formed in this way, the main body 1 of the apparatus is raised and the main body 1 of the apparatus is raised.
Immediately before pulling out the bag from the upper part of the bag B, the upper end of the bag B is heat-sealed with a sealer (not shown) to seal the opening, as shown in FIG. 9. B will be sealed.

In this case, the shape of the upper part of the bag B is reliably maintained by suction by the folding part forming device and adsorption to the device main body 1 side, and the folding parts G are reliably formed. Therefore, the tabs I produced by the thermally fused seal never become irregular.

As described above, in the above embodiment, the folded portions G, G are formed by suctioning from the inside and adsorption to the main body of the device, so the folded portions G, G are formed more reliably than in the conventional external pressure method. As a result, after the bag is sealed, there is no uneven folding at the folded part, and there is no unevenness of the ears I caused by the sealing, which is a particularly remarkable effect. .

In the above embodiment, the side suction holes 10,
10 is formed into a slit shape, the suction force against the bag body B is strengthened, and almost the whole of the upper side parts D, D of the bag body B are attracted, and the folded parts G, G,
In particular, the best effect was obtained in terms of the reliability in forming the center fold lines H, H, but the shape of the side suction holes 10, 10 is by no means limited to this, and for example, as shown in FIG. As shown, a large number of circular holes may be continuously drilled. Similarly, in this embodiment, the suction holes 11, 11 on the front back surface are formed in a slit shape and are formed in the lateral direction of the body 7, so that the suction force is increased and the suction holes 11, 11 on the front back surface E, F of the bag body B are increased. A favorable effect was obtained in that almost the entire portion of the front surface was suctioned and the front surface portions E and F were supported most reliably. It's never a question.

Furthermore, in this embodiment, since the grooves 9, 9 on the side surfaces of the device main body 1 are formed in a substantially V-shape, the folded portions G, G are formed more easily along the V-shape of the grooves 9, 9. Although the favorable advantage of ease of operation has been obtained, the grooves 9, 9 are not necessarily limited to a substantially V-shape, and may be, for example, U-shape. The point is that side suction holes 10, 10 that can suck the bag B along the grooves 9, 9 need only be formed in the main body 1 of the apparatus.

Furthermore, in this embodiment, the neck portion 4 of the device main body 1
Hollow parts 3 and 6 are formed in the body part 7 and the body part 7, but the main body 1 of the apparatus does not necessarily have to be formed in a hollow shape as in the embodiment. , 10 and front suction hole 1
1 and 11 should be bored in the main body 1 of the apparatus so as to communicate with each other. Furthermore, the structure of the apparatus main body 1 does not need to be composed of the top plate 2, the neck part 4, and the body part 7 as in the embodiment, and may have a shape without the neck part 4, for example. Furthermore, the material of the device main body 1 is not limited to the metal of the embodiment.

Furthermore, in this embodiment, the side parts D, D of the bag B were pressed and supported by the pressing bodies 20, 20 before the bag B was suctioned by the device main body 1, so that the subsequent folding work was facilitated. Although the benefits were obtained,
This pressing body 20 is not necessarily essential to the present invention.

Furthermore, in this embodiment, the device main body 1 is configured to be able to rise and fall freely by the action of a cam, but the means for raising and lowering the device main body 1 is by no means limited to this; for example, an air cylinder may be used to raise and lower the device body 1. It's okay. Further, in the embodiment, such elevating means is provided indirectly on the device main body 1 via the elevating plate 13, but the device body 1 is not limited to this, and the device main body 1 may be provided with a function that allows direct elevating.

Furthermore, although this embodiment deals with a bag B made of thermoplastic synthetic resin, the material of the bag B is not limited to this, for example, it may be made of paper laminated or coated with a film. It's okay.

All other design changes can be made within the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is a side view of a main body of a folding part forming apparatus as an embodiment. Figure 2 is a plan view of the same. FIG. 3 is a sectional view taken along the line X--X in FIG. 1. FIG. 4 is a sectional view taken along the Y-Y line in FIG. 1. FIG. 5 is a perspective view showing the installed state of the main body of the device.
FIG. 6 is a schematic plan view of the sealing machine. FIG. 7 is a front view showing the state of use. FIG. 8 is a sectional view for explaining the action. FIG. 9 is a perspective view of the bag after being sealed. FIG. 10 is a side view of the main body of the apparatus according to another embodiment. FIG. 11 is a cross-sectional view of a bag for explaining the function of a conventional example. 1... Apparatus body, 8... Suction port, 10, 10...
...Side part suction hole, 11,11...Front back part suction hole, B...Bag body, D, D...Side part, E...Front part, F...Back part, G, G...Folding part .

Claims (1)

[Scope of utility model registration request] A suction port 8 for sucking the space inside the device main body 1 from the outside and both side surfaces D, D of the bag body B are sucked into a pair of grooves 9, 9 formed on the sides of the device main body 1. A pair of side suction holes 10, 10 for forming the folded portions G, G, and the side suction holes 10, 1.
At the same time when suctioning from 0, the front back part E, F of bag body B
A pair of front suction holes 11, 11 for suctioning the liquid to the front side of the apparatus main body 1 are formed in the apparatus main body 1 so as to communicate with each other through a space inside the apparatus main body 1. A folding part forming device for a bag sealing machine, characterized by: