JPS63281933A - Method and apparatus for longitudinal sealing in packing - Google Patents

Abstract

PURPOSE:To efficiently and continuously perform packing, by a method wherein the main body of a longitudinal seal apparatus is allowed to approach a cylindrical sheet from the lower end side thereof and allowed to fall at the same speed as the cylindrical sheet to perform heat-sealing and separated from the cylindrical sheet from the upper end side thereof at the time of separation to be allowed to rise. CONSTITUTION:The sheet 7 from a sheet roll 6 is formed into a cylindrical sheet 21 by a former 20 to fall to a longitudinal seal apparatus 22 and packing, heat-sealing and lateral cutting are performed by a lateral seal apparatus 24 to obtain a packing bag 9. The main body 40 of the longitudinal apparatus 22 is in a vertical state in the posture brought into contact with both edge parts 21' of the cylindrical sheet 21 to be brought to a surface-to- surface contact state in parallel to the cylindrical sheet 21 and energized in the posture spaced apart therefrom by a leaf spring 43 to be brought to a backward inclined posture and, therefore, the lower end side of said main body approaches the cylindrical sheet 21 at first to be brought into contact therewith at the time of approach and the leading end thereof is separated therefrom at first at the time of separation and no damage is always applied to the cylindrical sheet 21 along with the upper and lower round parts 40', 40' of the main body 40. The heat-sealing of the main body of the longitudinal seal apparatus to the cylindrical sheet continuously falling at a constant speed is always performed in a constant state and a bag is formed without generating wrinkles.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is for sealing products such as various chip-type block-shaped frozen foods and snack foods in flexible bags formed from film-like sheets such as polyethylene. It belongs to the technical field of packaging.

Summary of the Purpose> Therefore, the invention of this application continuously pulls out a film-like sheet from a sheet roll of a predetermined size that is mounted horizontally at the rear of a frame of a packaging device, Formed into a cylindrical sheet through a provided former,
Therefore, vertical sealing was performed continuously by heat welding on the overlapping parts of both vertical edges of the cough tubular sheet, and then the product was introduced from above, horizontal sealing was performed, and horizontal cutting was performed. This invention relates to a vertical sealing method for packaging and an apparatus directly used in the method, and in particular, a cylindrical sheet fed downward from a former is continuously fed at a constant speed, and the cylindrical sheet fed at a constant speed is On the other hand, this invention relates to a method and apparatus for vertically sealing a package, which reliably vertically seals a cylindrical sheet without damaging the cylindrical sheet using a vertical sealing device that descends and rises vertically at the same speed as the cylindrical sheet.

<Prior art> As is well known, as the economy prospers, people's lives improve, and their activities become more diverse, consumption also takes on various forms.In particular, when it comes to food, various products are sold in small quantities, They began to be produced in large quantities and traded on the secondary market, including instant foods, frozen foods, and even
A wide variety of snack products are now available,
Due to the special nature of food, a distributed product, from a sanitary point of view, etc.
In addition, packaged products that are sealed and packed in flexible bags made of resin such as polyethylene have become widely distributed due to the advantages of unit weight and quantity transactions. There are a variety of products, from loose items such as shapes to solid pieces, but in order to facilitate easy handling and ensure accurate and smooth transactions, products weighed at set weights are packaged in continuous packaging. The formats in which these materials are processed have become established, and various research and improvements have been made on these handling techniques.

In the packaging process, the sheet is generally pulled out from a sheet roll of polyethylene film or the like mounted on the rear of the frame of the packaging device, formed into a cylindrical sheet using a so-called former, and passed through a chute from above in the pre-processing stage to a set weight. The so-called vertical packaging method is widely used, in which a weighed product is put in, vertical sealing is performed by thermal welding on both polymerized edges, then horizontal sealing is performed, and horizontal cutting is performed using a cutter to package the product. ing.

<Problems to be Solved by the Invention> However, in the conventional packaging technology, due to the formation of a cylindrical sheet using a film-like feeding sheet, weighed products are introduced from above in the previous stage and fall by gravity. In order to achieve this, in the process of vertically feeding a cylindrical sheet, the sealing process is generally shortened due to the constraint that vertical sealing for the overlapping portion of both edges of the cylindrical sheet and horizontal sealing for forming a unit pack are performed for each unit bag. From to the cutting process, an intermittent sheet feeding system is adopted, in which vertical and horizontal seals are performed one after the other during minute stops, and the product is loaded during the vertical feed between the next vertical seal and horizontal seal. It was like that.

Therefore, a sheet that is intermittently fed vertically is subjected to a large acceleration when it starts up after the vertical seal and the horizontal seal, and a large inertial force acts when the vertical seal and the horizontal seal stop.
There are disadvantages in that it is difficult to ensure the integrity of the sealing part as well as the shock load of the products being thrown in from above is applied, and in extreme cases, the sealing part may be damaged.

Since the feeding tension for the sheet due to such intermittent feeding differs between sealing and feeding,
There is an inconvenience that it is difficult to balance the load in each drive part and adjust the pull-down force, feed-out force, etc. Therefore, the structure of the mechanism part has to be complicated, and the control is also complicated. , which had the disadvantage of leading to high costs.

Another disadvantage is that running costs increase due to the hassle of maintenance, inspection, maintenance, and management.

<Problems to be solved by the invention> In order to solve this problem, for example, as seen in the invention of Japanese Patent Publication No. 59-3325, a so-called endless drive type circulating vertical seal or a circulating horizontal seal is installed at the bottom of the former. A flow-type sealing technology has also been developed, but due to the structure of the device, it is difficult to control the temperature and horizontal cutting of the vertical seals and horizontal seals of chain drives and belt drives.
The structure tends to be extremely complex, and at that time it+
The negative point was that the II model was also extremely complicated.

Furthermore, even when sealing is performed using such a one-flow type seal, it is still a circulation type seal, so the seal, especially the vertical seal, must be sealed at the same speed as the descending cylindrical sheet. Therefore, it is extremely difficult to control the circulation speed of the device, especially the descending speed of the device in accordance with the descending speed of the cylindrical sheet.

In other words, the cylindrical sheet can achieve the same speed as the sheet delivery speed from the sheet roll through a constant tensile force, but the vertical sealing device is lighter than the entire packaging device. Therefore, it is easily affected by vibration and rocking, and therefore, even though it descends in a short span of one bag, there is a tendency for minute changes in speed to occur midway through the descent, and as a result,
There was a problem with not being able to seal accurately during continuous descent.

In addition, since the vertical seal presses the main body of the vertical sealing device, which is rectangular in side view, into contact with relatively long parts of both edges of the cylindrical sheet, when the upper and lower sides approach and separate at the same speed, the cylindrical sheet There was a disadvantage that the cylindrical sheet was easily damaged, especially in the heated state during thermal welding, and the cylindrical sheet was weak and easily damaged.

<Object of the Invention> The object of the invention of this application is to utilize the advantages of intermittent heat welding and transverse cutting of seals while continuously feeding a film-like sheet from a sheet roll based on the above-mentioned prior art, and further, The sheet is always fed at a constant speed from the former to the cross-cutting, just like the feed from the sheet roll, and the balance between thermal welding to the sheet and cross-cutting and loading the product from the upper chute is optimized. be able to do it,
Vertical sealing is performed at a descending speed that reliably matches the sheet feeding speed, preventing unexpected troubles such as damage to the cylindrical sheet, ensuring stable feeding and product filling at all times, and efficiently and continuously feeding the entire flow set. It is an object of the present invention to provide an excellent method and apparatus for vertically sealing packaging, which will benefit the application field of product processing technology in the distribution industry.

Means/effect for solving the above-mentioned problems> In accordance with the above-mentioned object, the structure of the invention of this application, which is summarized in the above-mentioned claims, is mounted on the rear part of the frame of the packaging device in order to solve the above-mentioned problems. A film-like sheet from a sheet roll of a predetermined size is given a predetermined tensile force by the rollers of a pair of feeding devices at the bottom of a former provided at the front of the device, and is constantly fed with a constant feeding force. The sheet is fed at a constant speed, and is formed into a cylindrical sheet and lowered through the former at the top of the device, and during the lowering process on both sides of the inner cylinder, the oscillation of a cam, crank mechanism, etc. is performed at the bottom of the former. Through a dynamic circulation device, the vertical sealing device follows a circulation path in a vertical plane, descends at the same speed as the cylindrical sheet that descends at a constant speed, and then rapidly rises and returns. Vertical sealing is performed by heat welding, and at this time, the vertical sealing device body, which circulates in the vertical plane against the cylindrical sheet, approaches the cylindrical sheet from the lower end when approaching and presses against the cylindrical sheet, and when separating, it separates from the upper end. In order to prevent damage to the cylindrical sheet, the vertical sealing device main body is moved up and down, so that the vertical sealing device main body can perform stable downward circulation at the same speed as the cylindrical sheet, which is always lowered at a constant speed. At the same time, the cylindrical sheet is lowered and raised at the same speed to form a horizontal seal, and a cutter installed in the horizontal seal performs a horizontal cut, and at this timing, the vertical seal is Products weighed to a predetermined weight are loaded from the previous stage through a chute installed at the top, and products are packed into units by horizontal sealing and cutting in the next cycle of the cylindrical sheet that descends at a constant speed. The bags are cut and formed into units, and the feeding of the cylindrical sheet is guaranteed to be at a constant speed throughout the entire process from feeding to cross-cutting, avoiding unexpected troubles such as impacts from dropped products, and sealing and sealing at the optimal timing. Technical measures have been taken to ensure that the cutting is done to increase the reliability of the product and to prevent a decrease in yield.

<Example> Next, an example of the invention of this application will be described below based on the drawings.

In the embodiment shown in FIGS. 1 to 7, loose products such as cheese are weighed by a predetermined weight via a measuring device (not shown) in the previous stage, and then placed in a flexible bag made of polyethylene and packaged continuously. 1 is a packaging device.

It is connected to a timing hopper of a pre-stage weighing device (not shown) through a cone-shaped chute 3 provided on the upper part of the frame 2 of the packaging device, and is equipped with a control device 4 and a computer 5 having a power source. The sheet is formed into a cylindrical sheet by a sheet 7 pulled out from a sheet roll 6 wound with a polyethylene film sheet of a predetermined size that is replaceably provided, and is discharged from above through a chute 3 according to a set cycle. Weighed products 8 of each set weight are input and stored, sealed by upper and lower horizontal seals by heat welding, formed into a rectangular bag 9 of a set size, and discharged.

The sheet roll 6 is attached to the shaft 10 in a replaceable manner by a clamp device 11, and is prevented from overrunning by a well-known powder brake 12. Also, the sheet roll 6 is connected to a timing pulley and a motor via a transmission device 13 by a timing pulley and a belt. Rotating force is applied from 14 with a predetermined torque.

Thus, the sheet 7 from the sheet roll 6 is transferred to the tension roller 15, the idle roller 16, and the guide roller 17.1.
7... and formed into a cylindrical sheet 21 by a former 20 provided at the lower part of the chute 3 and descended via a check roll 19 etc., as in the conventional manner,
It descends to a vertical sealing device 22, then passes through a continuous constant-speed rotary body formed by a feeding device 23, and then goes to a horizontal sealing device 24 for packaging, thermal welding, and horizontal cutting to obtain a packaging bag 9. .

A driving device 25 is installed on the back side at the rear of the frame 2 in FIG. 2, and is electrically connected to a power distributor 26 at the bottom via cables and lead wires (not shown).

In the vertical sealing device 22, as shown in FIG. A timing belt 30 is stretched between the supported shaft 29 and a timing pulley, and an eccentric cam 33 is rotatably supported and connected via a transmission 31 to the base of a link 32 forming a swing circulation device. There is.

Also, a link 321 is supported by a pin along with a link 32' which is also supported by a shaft 29' on the frame 2.
and link 3 to form a four-point link as shown in Figure 1.
4, the circular rocking process in the order of a, b, C, and d shown in Fig. 5 is drawn vertically, and the links 32'', 3
A rod 35 in the front and back direction is inserted through the upper part of each of the rods 21, and a spring-type pressing force adjustment device 36 is provided on the base side of the rod 35, and a horizontal parr 37 is provided at the tip and supported on the back surface of the central part. A vertical sealing device main body 40, which includes a built-in heater 39 similar to the conventional embodiment and is electrically connected to the power distributor 26 via a bar 38, is pivotally installed via a pin 41 so as to be freely tiltable.

As shown in FIG. 4.6, a stopper 42 is provided at a predetermined position on the upper surface of the support bar 38 on the pin 41 side to restrict the backward tilting posture of the vertical sealing device main body 40 at a predetermined angle. In addition, a plate spring 43 as a tilting device is interposed in a convexly curved shape between the lower surface of the vertical sealing device main body 40 and the back surface of the vertical sealing device main body 40.
4, and on the back side of the support bar 38 there is a screw 45 that allows the pressing force to be freely adjusted (through a long groove (not shown) for the plate spring 43.
The vertical sealing device main body 40 in a natural state is stopped by
The return force of the tilted posture can be adjusted.

Note that the cylindrical sheet 21 side of the vertical sealing device main body 40, that is,
Vertical section rounded portions 40', 40' are formed at the upper and lower parts of the front side to form the vertical sealing device main body 40.
It is designed so that the cylindrical sheet 21 will not be damaged unexpectedly when the cylindrical sheet 21 is brought into close contact with the cylindrical sheet 21 and separated from the cylindrical sheet 21.

Therefore, the vertical sealing device main body 40 in the normal state
When the vertical sealing device main body 40 is not in contact with the cylindrical sheet 21, as shown in FIG. In the posture shown in FIG. 7 in which the cylindrical sheet 21 is in contact with both edges 21', the cylindrical sheet 21 is in an upright state.
In addition, as shown in FIG. 6, in the separating position, the plate spring 43 biases the blade into a backward tilting position, so that when approaching, the lower end side comes first as will be explained in detail below. It comes into close contact with the cylindrical sheet 21, and when separated, the upper end side separates first, so that the cylindrical sheet 21, together with the upper and lower affle portions 40', 40', will not be damaged at all times.

And each link 32.32 of left and right link 34.34
t, 32t, and a, b due to the design of the eccentric cam 33.
.

Drawing the circulation cycle in the vertical plane of c and d, as shown in Fig. 6.7, the inner cylinder 46 approaches the front outer surface of the cylindrical sheet 21 from both sides. Heat welding is performed on both edges 21' that overlap.

Due to the design of the links 32, 32', 32' and the eccentric cam 33, as shown in FIG. , the speed of separation from the cylindrical sheet 21 from C to d, and the speed of the separation from the cylindrical sheet 21 from a to b
The speeds of the steps d and a move away from each other at approximately the same speed, and the speed of the rising process d to a is a set speed faster than the descending speed, and when approaching the cylindrical sheet 21, As shown in FIG. 7, the lower end approaches first in the intrusively inclined posture, and the upper end approaches later after a predetermined minute time, and as shown in FIG. 7, the cylindrical sheet 21 The pressing force in the abutting position can be adjusted to the optimum pressing force in advance or during operation by a pressing force adjustment device 36 at the rear, and conversely when separating, the pressing force in the position shown in FIG. As shown in FIG. 6, the plate spring 43 causes the upper end side to separate first, and then the lower end side to separate, thereby avoiding damage to the cylindrical sheet 21 together with the upper and lower rounded portions 40' and 40'. These designs can be easily realized by a person skilled in the art by mere design considerations.

As shown in FIG. 2.3, the feeding device 23 for the sheet 7, that is, the cylindrical sheet 21, is connected to a timing belt 30' and , another horizontally installed shaft 47 at its lower part, and also a pair of rotating shafts 49,49 which are brought forward via a pair of bevel gear devices 48,48 at both ends thereof, and at their front ends in the transverse plane. The cylindrical sheet 21 enclosed in the cylinder 46 is compressed by rubber pulleys 51 and 51 to which rotational force is transmitted via arms 50 and 50, which open and close in a predetermined manner, and is sent downward at a constant speed in a pull-down manner. It is like that.

Further, the lateral sealing device 24 for performing lateral cutting provided at the bottom of the pulley 51, 51 has a vertical sealing device 24 which engages with a reversible motor 12 provided at the bottom of the frame 2, as shown in FIG. The rack 53 is raised and lowered at the same speed by a predetermined oil/gas damper device 54 installed at the bottom of the frame 2 by a drive device 56 installed below a metal ram plate 55 along the horizontal direction. While descending at the same speed as the descending speed of the cylindrical sheet 21, the cycle of opening and closing the cylindrical sheet 21 is repeated to horizontally seal and cut the bag 9 with the product inside. ing.

As shown in Fig. 6.7, in order to form a continuous heat-welded portion at both overlapping edges 21' of the cylindrical sheet 21, one vertical sealing stroke l in the longitudinal direction is They are made to double each other by e so that there are no non-welded parts.

In the packaging device 1 configured as described above, when products are weighed in advance by a combination weighing device (not shown) connected to the upper part and are continuously packaged in packaging bags 9, sheets of a preset and fixed size are used. The roll 6 is wound and mounted on the shaft 10 in a predetermined manner via a clamp device 11.

Therefore, the pair of feeding rolls 51.5 of the feeding device 23
1 is opened outward through each arm 50, and the sheet 7 from the sheet roll 6 is manually moved to the tension roller 15, idle roller 16, and guide roller 17.1.
7..., pass through the check roll 19 etc., guide the former 20 to form the cylindrical sheet 21 through the cylinder 46 and lower it, stop and separate the vertical sealing device main body 40 and the cylindrical sheet in the separated position. It passes between the sheet 21, between the pair of feed rolls 51 and 51 that are separated and open, and then between the widened horizontal sealing rows 24, and then downwards for a predetermined length. put it in a tensioned state, and then feed device 2
The pair of arms 50° 50 of 3 are placed in an inwardly closed position, and the start button of the control device 4 is pressed to start the packaging operation.

The operation and control of each mechanical section is automatically performed via the control device 4 according to a program input into the computer 5 in advance.

Thus, the sheet 7 is sent out from the sheet roll 6 through the rotation of the shaft 10 by the motor 14, and the feeding device 23 is started by the rotation of the motor 27, and the sheet 7 is set through the timing belt 30 and the timing belt 30'. The sheet 7 formed into the cylindrical sheet 21 by the former 20 is constantly fed downward at a constant speed by the mutually inwardly rotating each of the folding rolls 51 at a constant speed.

Even if overtorque is unexpectedly applied to the rolls 51 and 51 in the feed device 23, slippage occurs between the wheels 47 and the feed rolls 48, so that the cylindrical sheet 21 No excessive tensile force is applied, and no breakage or the like occurs.

The cylindrical sheet 21, which is continuously lowered from the former 20 at a constant speed, is rotated by the circulating device 3 shown in FIG.
4, the power from the motor 27 is applied to the vertical sealing device body 4o via the rod 35 by the action of the eccentric cams 33, links 32, 32', and 32', as shown in FIG. While descending from b to C at the same descending speed as the speed, thermal welding is performed using the built-in heater 39 that is heated by electricity from the power distributor 26 to form a vertical seal, and with a predetermined stroke, C is separated from C to d. It rises from d to a at a rising speed faster than the falling speed shown in Figure 5, and furthermore, a
One cycle is completed by approaching the overlapping part of both edges 21' of the cylindrical sheet 21 at a speed of The lower side of the device main body 40 comes into close contact with the cylindrical sheet 21 slightly quickly, and the upper part approaches the pin 41 with a slight delay.
During this time, the set pressing force is applied by the pressing force adjustment device 36 to ensure vertical sealing, and when separating, the upper The sides are separated first, and then the lower side rotates reversely via the pin 41 and the leaf spring 43, and the lower side is separated, so that the cylindrical sheet 21 is separated from the upper and lower rounded portions 4°' and 40' of the vertical sealing device main body 40.
Heat welding can be carried out smoothly without causing any damage.

Therefore, while the cylindrical sheet 21 continues to be lowered by being fed at a constant speed, the vertical sealing by the vertical sealing device 22 is smoothly carried out through a gentle, square-shaped circulation process in the vertical plane.

Of course, depending on the design, the cylindrical sheet 21 as shown in FIG.
The ends of the vertical stroke J of one cycle of the thermally welded portion of the vertical seal are set so that they overlap by a slight length e to prevent an unripely melted portion from occurring.

The vertically sealed cylindrical sheet 21 is then transferred to a roll 51 for continuous feeding by a feeding device 23 at the bottom thereof.
Due to the pressing action of the cylindrical sheet 21 against the cylinder 46 by the cylinder 46, the cylindrical sheet 21 is sequentially lowered in a vertically sealed state and fed between the horizontal sealing devices 24, and in the horizontal sealing device 24, the motor 52 The lateral seal device 2
4 expands and contracts as it moves up and down, creating a mouth-shaped circulation action in the vertical plane.

Then, by performing the lowering speed at the same speed as the lowering speed of the constant-speed feeding of the cylindrical sheet 21, heat welding is performed by the built-in heaters to each other via the control device 4 in the close retracted position, and the horizontal seal is formed. At the same time, the built-in cutter performs cross-cutting, and at the same time, the shutter of the collection hopper of the upper weighing device (not shown) is opened via the control device 4, and the product 8 passes through the chute 3 and the cylinder 39 to the upper section where it is laterally sealed. It is put into the cylindrical sheet 21.

During this time, as described above, the lifting action of the ram plate 55 via the motor 52 is stabilized due to the damping action of the gas damper device 54, and furthermore, the ram plate 55 has a predetermined weight and a large inertial force. Therefore, in order to move up and down at a constant speed without causing any disturbance in the speed of movement even when taking pictures of the mechanism, the lateral sealing action and lateral cutting are performed as designed for each pitch. The product accuracy is therefore guaranteed as designed.

Since the cylindrical sheet 21 continuously and steadily descends at a constant speed, there is almost no relative speed to the product being thrown in, and therefore the cylindrical sheet 2 2 is lowered by the product being thrown in.
1. The impact on the horizontal seal part is weakened, and troubles such as breakage do not occur.

Further, the pressing force of the vertical sealing device main body 40 against the cylinder 46 in the vertical sealing is similarly adjusted to a preset pressing force by the pressing force adjusting device 36 at the rear of the rod 35.

In addition, as shown in Fig. 5.6.7, the vertical sealing device main body 40
In the process of approaching the cylindrical sheet 21 from the lower side and separating from the upper side, the vertical sealing device main body 4
To apply the pressing force of the leaf spring 43 to apply the closing force and the restoring force of the 0. By tightening 45, the spring force can be adjusted.

Further, depending on the design, the stopper 42 may also be of a screw type to adjust the inclination angle.

In this way, the downward feeding of the sheet 7 from the sheet roll 6 from the former 20 to the horizontal sealing device 24 is always carried out continuously at a constant speed, and following this, the vertical sealing device @23 and the horizontal sealing device Thermal welding of the vertical seal and the horizontal seal in mounting @ 24 is carried out by descending constant speed feed at the same speed as the descending speed of the cylindrical sheet 21, so there is no stopping or rising of the cylindrical sheet 21, and the acceleration at that time is Therefore, no undue stress is applied to the thermally welded parts of the vertical and horizontal seals, and unexpected situations such as breakage and cracks are prevented. The relative speed of the products to the tubular sheet 21 when they are introduced is reduced, the impact force of the acceleration due to the product is also weakened, and the products can be continuously introduced and packaged smoothly without damage to the heat-welded parts.

The embodiment shown in FIG. 8 has a vertical sealing device main body 40'.
In this embodiment, a coil spring 43' is wound in place of the plate spring 43 as the tilting device in the above-mentioned embodiment.Furthermore, in the embodiment shown in FIG. 43' and 43' are provided oppositely to each other on the back surface of the support bar 38 and the vertical sealing device main body 40', and the operation and effect thereof are substantially the same as those of the above-mentioned embodiments.

In addition, aspects of the design change of the embodiment shown in FIG. 9 are as follows.
It is possible to replace the magnet with a solenoid of the same polarity and connect it to the control device so that it is energized and excited only when the magnet is separated.

Furthermore, the fruit of the invention of this application is t! Of course, the i aspect is not limited to each of the above-mentioned embodiments. For example, the swinging circulation device for the vertical sealing device main body may have an elevating mechanism and an advancing/retracting mechanism constructed of gears, etc., instead of the cam link system of the above-mentioned embodiments. Various aspects can be adopted, such as linking each other with each other.

The target packaging sheet may be a sheet other than polyethylene, and it goes without saying that the present invention can also be applied to products such as snack products.

<Effects of the Invention> As described above, according to the invention of this application, a cylindrical sheet is vertically and horizontally sealed using a former made of a polyethylene sheet, etc., and the product is removed from the preceding measuring device, etc. In the process of loading and packaging, basically continuous uniform downward feeding is applied to the cylindrical sheet that is fed downward from the former to the horizontal seal via the vertical seal, and By lowering the vertical sealing device, both the vertical seal and the horizontal seal, and therefore the horizontal cutting, are always lowered at a constant speed and at the same speed in synchronization with the cylindrical sheet that is continuously lowered at a constant speed. Since it is possible to perform vertical sealing, horizontal sealing, and horizontal cutting by downward constant speed feeding, it is possible to perform vertical sealing, horizontal sealing, and horizontal cutting with a downward constant velocity feed. No applied loads such as tension, therefore,
There is no risk of cracks or damage occurring in the product bag, and excellent effects such as increased reliability of the product and improved product yield are achieved.

In addition, since the vertical sealing device main body has a descending speed that matches the descending speed of the cylindrical sheet, it can be stabilized even when ascending to return to its position, and therefore it can be maintained at a constant speed. Because the heat welding when the vertical sealing device body approaches the cylindrical sheet that is being lowered is always performed in a constant state in the longitudinal direction with respect to the cylindrical sheet, fluctuations such as wrinkling occur during heat welding. An excellent effect is achieved in that a bag is formed as designed without affecting product accuracy.

Therefore, there is no risk that the product thrown in during sealing will be caught in the sealing portion or debris will enter, and therefore, excellent effects such as sealing defects at the sealing portion will not occur.

In the invention of this application, the vertical sealing device main body is connected to the tilting device via the support bar so as to be tilted at a predetermined angle in a natural state, and linked to the rocking circulation device. As a result, in the process of the vertical sealing device main body, which is in a separated state, approaching the cylindrical sheet that is continuously descending at a constant speed, the lower side approaches first, so that the swinging device main body It has the effect of ensuring that the lower side smoothly contacts the cylindrical sheet and does not damage the cylindrical sheet, and in the contact state, the lower side of the vertical sealing device body first comes into contact with the upper side, and the upper side comes into contact slightly later. The effect is that the heat welding action can be reliably applied to the center of both edges of the cylindrical sheet after the contact is made with a time difference of Contrary to when the main body of the vertical sealing device approaches, the upper side first separates, and the lower side leaves after a short period of time, so the cylindrical sheet is not damaged even when separated, and as mentioned above, This has the effect of not damaging both edges of the cylindrical sheet, which loses its strength when heated during thermal welding, and is effective when a smooth surface is formed on at least one of the top and bottom of the vertical seal. Coupled with the fact that there is a time difference between the approach and separation and contact between the upper and lower sides, this method ensures that the cylindrical sheet is not damaged, and as a result, it has the excellent effect of not adversely affecting product accuracy. Ru.

[Brief explanation of drawings]

The drawings are detailed explanatory diagrams of the invention of this application, and FIG. 1 is a schematic side view of the mechanism of a swinging heat melting @ device of a vertical sealing device according to one embodiment, and FIG. 2 is a schematic perspective view of the main parts of the entire device. Figure 3 is a plan view of Figure 1, Figure 4 is a partially sectional side view of the vertical sealing device, Figure 5 is a schematic diagram of the oscillating circulation path, and Figure 6 is of the main body of the vertical sealing device. FIG. 7 is a side view of the vertical sealing device in a state in which it is in contact with the cylindrical sheet, and FIG. FIG. 6 is an enlarged side view of each partial section. 6... Sheet roll, 7... Sheet, 20...
- Former 121... cylindrical sheet, 21'... both edges, 40... vertical sealing device main body, 22... vertical sealing device, 38... support bar, 43... tilting device (plate spring), 34...oscillating circulation device Fig. 1 Fig. 2

Claims (11)

[Claims] (1) In a vertical sealing method for packaging by forming a sheet from a sheet roll into a cylindrical sheet using a former and thermally welding both edges of the sheet, the vertical sealing device body is brought close to the cylindrical sheet from the lower end side, and A method for vertically sealing a package, characterized in that the cylindrical sheet descends at the same speed as the descending speed of the cylindrical sheet to perform the heat welding, and when separated, the cylindrical sheet separates from its upper end, rises, and approaches in a circular motion. . (2) The method for vertically sealing a package according to claim 1, wherein the thermal welding is performed by adjusting the pressing force against the cylindrical sheet. (3) The method for vertically sealing packages as set forth in claim 1, wherein the vertical sealing device is configured to be able to freely adjust the angle of inclination when moving toward and away from the device. (4) In a vertical sealing device for packaging by forming a sheet from a sheet roll into a cylindrical sheet using a former and thermally welding both edges of the sheet, the vertical sealing device main body is swingably attached to a support bar via a tilting device. 1. A vertical sealing device for packaging, characterized in that it is pivotally supported and the support bar is connected to an oscillating circulation device. (5) The vertical sealing device for packaging according to claim 4, wherein the tilting device is of an angle adjustable type. (6) The vertical sealing device for packaging according to claim 4, wherein the tilting device is of a spring type. (7) The vertical sealing device for packaging according to claim 4, wherein the tilting device is of a magnetic type. (8) The vertical sealing device for packaging according to claim 4, wherein the swinging circulation device is of a cam link type. (9) The vertical sealing device for packaging according to claim 4, wherein the swinging circulation device is formed of an elevating mechanism and an advancing/retracting mechanism. (10) The vertical sealing device for packaging according to claim 4, wherein the oscillating circulation device has a pressing force adjusting device for the vertical sealing device main body. (11) The vertical sealing device for packaging according to claim 4, wherein rounded portions are formed on the cylindrical sheet side at the upper and lower ends of the vertical sealing device main body.