JPH07300109A - Band tightening method for packing machine, and packing machine - Google Patents

Abstract

PURPOSE:To pack an article to be packed having a grounding area which is smaller than a sliding table by a method wherein after pulling out the sliding table from a tied band, the band, excepting a welded part at the terminal end, is heated to make the band shrink, and thus, the article to be packed is tightened. CONSTITUTION:A band 18 made of a plastic is wound around an article to be packed 16 while a sliding table is being attached, and an overlapped part at both ends of the band is molten and press-bonded, and then, the sliding table is pulled out. Then, the band, excepting the welded part at the terminal end, is heated to a specified temperature or higher by a heating means 42 to make the band 18 shrink, and the article to be packed 16 is tightened by an appropriate tightening force. By this method, a slackness of the band after the pulling out of the sliding table is sufficiently absorbed, and even an article to be packed wherein the width of the ground area is narrow such as a plurality of steel pipes, etc., can be assuredly packed. Also, a troublesome work for the replacement of the band, etc., can be eliminated, and the workability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band tightening method and a packing machine for a packing machine, in which a plastic band is laid around a packed article to pack the packed article.

[0002]

2. Description of the Related Art There is known a packing machine (banding machine) for packing a band such as a cardboard, an aluminum can, or a tire with a band in an appropriate shape such as a cross or a parallel shape. In this type of packing machine, a plastic band such as a polyester band, a polypropylene band (PP band) or a nylon band having a width of about 6 to 19 mm is used as a band.

Generally, a packing machine is formed by including a body unit including a table on which a package is placed, and an arch-shaped bandway unit above the table. For example, a band from a reel unit adjacent to the body unit is formed. However, it is sent from the body unit to the bandway unit. The packaged item is placed at a predetermined position on the table of the body unit, the band is dropped from the bandway unit by the operation of the start switch, and it is wrapped around the packaged item, and after tightening the band with a specific tension. Cutting the band and melting the overlapping part of the terminal,
The packaged item is packaged by crimping.

In such a packing machine, usually, a slide table is arranged below the table so as to be movable back and forth in a horizontal direction orthogonal to the bandway, and the lower surface of the slide table is used to hold and hold the band. Stopping, melting of the band end, pressure bonding, etc. are performed. Then, after welding the ends of the band, that is, after binding the band in a ring shape, the slide table is pulled out, and the packing of the packed object is completed.

Since the band is tightly tightened under a specific tension to be banded, it is usually bound in a slightly stretched state. That is, when the slide table is pulled out, it is contracted by an amount corresponding to the amount of extension under the restoring force of the band, so that the packaged item can be tightened even after the slide table is pulled out.

[0006]

For example, in the case of packing a package such as a corrugated board whose bottom surface, that is, the ground contact surface with respect to the table, is wider than the width of the slide table, only an amount corresponding to the thickness of the slide table is used. ,
Since it suffices to restore the band, a strong tightening force is sufficiently maintained on the bound band even after the slide table is pulled out.

Here, in the case of packing a package having a grounding surface narrower than the width of the slide table, for example, a small cardboard box or a plurality of bundled steel pipes, the thickness of the slide table has a surplus from the grounding surface of the packaged product. The band is bound with the length added. In other words, the diameter of the bound band is
Since the length of the package is excessively long compared to the peripheral length of the package, loosening of the band with respect to the package is unavoidable under the restoring force after the slide table is pulled out.

Therefore, in the known packing machine, a packing object having a grounding surface narrower than that of the slide table cannot be sufficiently packed, and the packing object that can be packed is limited based on the width of the slide table.

Here, in a known packing machine, normally,
We use a band with a large amount of expansion and contraction to pack steel pipes with a narrow grounding surface, but the band itself becomes expensive and the packing machine needs to be packed depending on the size of the grounding surface of the package. Since the band has to be exchanged, it lacks versatility and unavoidable deterioration of workability.

An object of the present invention is to provide a band tightening method for a packing machine and a packing machine which enable packing of a package having a grounding surface narrower than the width of the slide table without using a band having a large expansion / contraction amount. There is.

[0011]

In order to achieve this object, in the present invention, a plastic band is
We pay attention to its property of shrinking under heating.
Therefore, according to the band tightening method of the packing machine of the present invention, after pulling out the slide table, the other parts of the band except the welded part of the terminal are tightened to the extent that the packed object can be tightened under an appropriate tightening force. It is heated by heating means.

[0012]

In this method, since the band is contracted by the heating by the heating means, the band is tightened under the contraction and the looseness of the band after the slide table is pulled out is sufficiently absorbed.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a packing machine 10 according to the present invention comprises a body unit 12 and a substantially rectangular arch-shaped bandway unit 14 provided above a table 12a of the body unit. The packaged item 16 that is provided and placed on the table can be packaged by tightening the band 18.

As the band 18, for example, a polyester band having a width of about 6 to 19 mm or a polypropylene band (PP
Band), a plastic band such as a nylon band is used.

The packing process of the packing object 16, that is, the structure of the part for carrying out the process in the packing machine 10 is the same as the conventional one, and the packing operation by such a packing machine is as follows. .

As shown in FIG. 2, in the initial state of the packing machine 10, the band 18 pulled out from the reel unit is used.
But a pair of upper and lower feed rollers 20, 22 and right block
It is inserted through the band guide 26 via 24, goes around the bandway unit 14 and stands by. Further, in the initial state of the packing machine 10, the slide table 28 is located on the bandway on which the band 18 is arranged, and the middle block 30 and the left block 32 are both waiting at the lower position.

The reference numeral 34 shown in FIG.
It is the reel unit that is wound here.

In such an initial state, as shown in FIGS.
As shown in, the package 16 conveyed by the roller conveyor 35, for example, seven steel pipes is placed on the table 12a along the roller guide 36, and a start switch (not shown) is placed.
When you operate, as shown in FIG. 3, first, the right block 24
Rises and presses the end of the band 18, and the band guide 26 slides in the horizontal direction orthogonal to the band and retracts from the bandway. Then, the feed rollers 20 and 22 are reversed in the direction of the arrow to pull the band 18, and the band 18 is dropped around the band-shaped unit 14 having an arch shape, so that the band is wrapped around the package (steel pipe) 16.

After the band 18 is wound around the package 16 by reversing the feed rollers 20 and 22, the band is further pulled and strongly tightened under the swing of a tension arm (not shown). . That is, the band 18 is stretched by an appropriate amount under its own elasticity and is stretched around the package 16.

Then, as shown in FIG. 4, the left block 32
The band 18 is held tightly and tightly by being sandwiched between the band 18 and the slide table 28 as it rises, and the heater 38 is slidably inserted and interposed between the bands positioned above and below.

When the band 18 is pressed by the left block 32, the tension arm is slightly returned, and as shown in FIG. 5, the middle block 30 rises with the integral lower teeth (cutter) 40 to cut the band. At the same time, as the inner block is further raised, the facing surfaces of the overlapping ends of the band 18 are melted by the heater 38.

When each end of the band 18 is melted, the middle block 30 is slightly lowered, and the heater 38 is retracted in the horizontal direction orthogonal to the band to retract from the bandway, that is, between the ends of the band. To do.

After the heater 38 is retracted, as shown in FIG. 6, the middle block 30 is again raised, and each end of the band 18 is pressed against the lower surface of the slide table 28 to be pressure-bonded, that is, welded. As described above, in the packing machine 10, the bound article 18 temporarily tightens the packed article 16 while the slide table 28 is held therebetween.

After the crimping between the ends of the band 18, as shown in FIG. 7, the right, middle, and left blocks 24, 30, and 32 descend almost at the same time and stand by at the descending position, and are orthogonal to the band. The slide table 28 is pulled out of the bound band by retracting from the bandway in the horizontal direction.

As can be seen from FIG. 6, for example, when a plurality of steel pipes and the like are used as the package 16,
The ground plane of the package with respect to 12a is narrower than the width of the slide table 28. In this way, packing items with a narrow grounding surface
When the band 18 is bound together with the slide table 28 sandwiched between the 16 and the band, the band adds the excess of the slide table from the width of the ground plane to the thickness of the slide table as compared with the peripheral length of the package. Is formed to a diameter of a certain length.

Therefore, the slide table 28 is packed in the package 1
6. When the band is pulled out from between the bands 18, even if the band is restored by the extension by tightening with the tension arm, the excess width of the slide table cannot be sufficiently compensated, and it is bound as shown in FIG. The band is easily loosened against the package.

In the present invention, attention is paid to the fact that the plastic band 18 has a so-called heat-shrinking property in which it shrinks at a certain temperature when it is heated above a specific temperature. . Therefore, as shown in FIGS. 1 and 8, in the present invention, the heating means 42 capable of heating the band 18 is used.
Are provided in the packing machine 10. The heating means 42 is, for example, from a bandway on which the band 18 is stretched and the package 16
Is placed on the table 12a at a position deviated in the traveling direction of.

As the heating means 42, it is possible to use, for example, a far-infrared heater which is formed in a substantially arch shape so as to radiate heat inward. Such heating means (far infrared heater) 42
Is connected to the body unit 12 so that the temperature, time and the like can be adjusted.

Since the band 18 also has a property of melting under heating, heating the welded portion may cause peeling under re-melting. Therefore, in the present invention, only the portion of the band 18 other than the welded portion is heated by the heating means 42.

Since the heating means 42 is disposed at a position displaced from the bandway in the traveling direction of the package 16,
The heating operation of the band by the heating means is performed by moving the band together with the packaged object to a position aligned with the heating means after the packing step, that is, the binding step of the band 18 is completed.

When the band 18 bound by the welding of the ends is heated by the heating means 42, the band is thermally contracted and its diameter is reduced. As the band 18, for example, width 19mm,
Using a 0.5 mm thick polyester band, about 180 ° C
When heated for about 2 minutes by the heating means 42 kept warm, the band is contracted at a contraction rate of about 20%.

Due to this heat shrinkage, the band 18 is further tightened from the diameter at the time of binding, and the package 16 is tightened under an appropriate tightening force.
The package is packed by tightening.

As described above, according to the band tightening method of the packing machine of the present invention, by the heating by the heating means 42,
Since the band 18 after binding is contracted by an appropriate amount, the band can be sufficiently tightened even when the width of the grounding surface of the package 16 with respect to the table 12a is narrower than that of the slide table 28.

In other words, the packing machine 10 can be used even for a packaged item 16 having a grounding surface less than or equal to the width of the slide table, regardless of the width of the grounding surface relative to the width of the slide table 28. The range of use of is sufficiently expanded.

Unlike the known method of using a band made of a material having a large elongation, the present invention uses a band having a general expansion / contraction rate so that a grounding surface such as a plurality of steel pipes can be used. Since the narrow package 16 can be packed, it is possible to omit the replacement of the band each time the work is performed. Therefore, troublesome work such as band replacement is eliminated, workability is improved, and increase in cost due to use of a band having a large elongation is reliably prevented.

Further, according to the packing machine 10 of the present invention, the band tightening method described above can be appropriately performed despite the simple structure, and the band can be securely tightened after the band 18 is bound. Therefore, even the package 16 having a grounding surface narrower than the width of the slide table 28 can be sufficiently tightened under an appropriate tightening force.

In the examples, a polyester band having a width of 19 mm and a thickness of 0.5 mm is exemplified as the band 18 used in the packing machine 10, and the heating temperature and the heating time are 180 ° C.
, 2 minutes, but since the conditions vary depending on the material, width, thickness, etc. of the band used, the heating temperature,
The heating time and the like are not limited to this. The plastic band 18 is usually heated to 120 to 200 ° C
It has the property of shrinking about 20%, and the heating time is appropriately adjusted within the range of 20 seconds to 5 minutes.

Further, in the embodiment, the far-infrared heater is illustrated as the heating means 42, but it is not limited to the far-infrared heater because it is sufficient if the band 18 can be heated to an appropriate temperature. A heater, a panel heater, a film heater or the like may be used as the heating means.

Further, the heating means 42 is sufficient as long as it can heat the band 18 bound around the package 16, and therefore the heating means 42 is not limited to the substantially semi-circular arch shape as shown in the drawing. Alternatively, the heating means may be formed in various other shapes such as a dogleg shape.

Further, in the embodiment, the heating means 42 is arranged by being placed on the table 12a.
Since it suffices if the band 18 bound around 16 can be heated, the heating means is not limited to placement, and for example, by an arm extended from a bandway unit or the like,
The heating means may be suspended at the corresponding position.

In the embodiment, after the band 18 is bound, the band is moved together with the package 16 to a position directly below the heating means 42. However, the present invention is not limited to this, and for example, the heating means 42 may be provided slidably with respect to the table 12a, and after the packing process, the heating means may be moved onto the bandway to heat the band.

The heating means 42 is not limited to one body, and the band 18 may be heated by, for example, two heating means arranged at adjacent positions with the bandway interposed therebetween.

Here, in the band tightening method of the present invention, the band 18 wound around the package 16 is
Since it suffices that the band is shrunk under the heating of the heating means, it is not limited to the configuration in which the band is directly hung by the packing machine 10. That is, the packing is not limited to the direct packing in the packing machine 10, and a ring of a band having a diameter that allows the package 16 to be inserted is formed in advance, and after the package is inserted into the band, the heating means 42 is used. The package may be packed by heat shrinkage under heating.

In the embodiment, an automatic packing machine is shown as an example of the packing machine. However, it is sufficient if the packing object can be banded, so that the operator can put the band on the packing object by hand. The present invention can also be applied to machines.

Although seven steel pipes are illustrated as the packaged items, other numbers of steel pipes and tubular bodies, and small cardboards smaller than the width of the slide table can be packaged by the same process. It goes without saying that you can do it.

The above-mentioned embodiments are for explaining the present invention and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0048]

As described above, according to the band tightening method for a packing machine according to the present invention, it is sufficient to shrink the band after binding by an appropriate amount by the heating by the heating means, and therefore the slide table. The packing machine can be used even for a packaged product having a grounding surface whose width is less than or equal to the width of the slide table, regardless of the width of the grounding surface relative to the width of the sliding table. Therefore, the range of use of the packing machine is sufficiently expanded.

Since it is not necessary to use a band made of a material having a large elongation, it is possible to omit the replacement of the band each time the work is performed. Therefore, troublesome work such as band replacement is eliminated, workability is improved, and cost increase due to the use of a band with a large elongation is reliably prevented.

Further, according to the packing machine of the present invention, the band tightening method described above can be appropriately performed despite the simple structure, and the band can be tightened after the band is bound, that is, the packed object can be tightened. Can be done reliably. Therefore, it is possible to easily secure a packing machine that can pack even a packed object having a ground surface narrower than the width of the slide table.

If a far infrared heater is used as the heating means, accurate heating of the band can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a packing machine according to the present invention.

FIG. 2 is an operation diagram of the packing machine viewed from the front in the initial state.

[Fig. 3] Fig. 3 is an operation diagram of the packing machine showing a time when the band is bridged.

FIG. 4 is an operation diagram of the packing machine when tightening the band.

FIG. 5 is an operation diagram of the packing machine when the band is cut.

FIG. 6 is an operation diagram of the packing machine showing a band terminal when being crimped.

FIG. 7 is an operation diagram of the packing machine at the end of the packing process.

FIG. 8 is an operation diagram of the packing machine when the band is heated.

[Explanation of symbols]

 10 Packing machine (automatic packing machine) 16 Packing object (steel pipe) 18 Band 28 Slide table 42 Heating means (far infrared heater)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Meguro 2-1-119 Hinode, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture

Claims (5)

[Claims] 1. A packing machine which wraps a plastic band around a package while sandwiching a slide table, melts and crimps overlapping portions at both ends of the band, and then pulls out the slide table to package the package. After pulling out the slide table, the other part of the band excluding the welded part of the terminal is heated by heating means to shrink the band and tighten the packaged item with an appropriate tightening force. 2. A band of a band through which a package can be inserted is formed in advance by a packing machine, and after the package is inserted into the band of a plastic band, other parts of the band except the welded portion of the terminal are removed. A band tightening method for a packing machine in which the band is contracted by heating with a heating means and the package is tightened with an appropriate tightening force. 3. The band tightening method for a packing machine according to claim 1, wherein the heating means is a far infrared heater. 4. A packing machine which wraps a plastic band around a package while sandwiching a slide table, melts and crimps overlapping portions at both ends of the band, and then pulls out the slide table to package the package. A packing machine, characterized in that a heating means is provided for heating other portions of the band after binding except the welded part, and the band after binding can be contracted by heating the band by the heating means. 5. The heating means is formed in an arch shape through which a package can be inserted from a far infrared heater, and is arranged so as to be displaced in a traveling direction of the package from a bandway around which a band is stretched. Packing machine described in 4.