JP3333925B2 - Vertical sealing device in bag making and filling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-making filling and packaging machine for sealing a longitudinally overlapped edge of a cylindrically formed packaging film with a positively driven seal roller to seal the film. The present invention relates to a vertical sealing device.

[0002]

2. Description of the Related Art Heretofore, in a bag making / filling / packaging machine, as a vertical sealing device for applying a vertical seal to an overlapped edge in a longitudinal direction along a feeding direction of a packaging film, for example, Japanese Utility Model Application Laid-Open No. 51-970.
As disclosed in Japanese Patent Application Publication No. 75-75, a heater is provided inside a heating roller connected to a pair of seal rollers that are forcibly driven to rotate while sandwiching a film.
As disclosed in Japanese Patent No. 759, there is a technique in which a heater is provided inside a seal roller itself.

In the above-described prior art, the heater provided inside the heating roller or the seal roller rotates integrally with the seal roller. Therefore, it is necessary to provide a brush ring in the power supply section of the heater, and wear and tear of the brush contact and the like. Power supply troubles due to poor contact and the like often occurred. In addition, because of the heating method using heat conduction from a heater provided integrally with the seal roller, the temperature difference between the heating source temperature and the film sealing surface of the seal roller is large due to heat loss, and the seal roller seals the film. It took time to reach the required temperature.

Therefore, as disclosed in Japanese Utility Model Laid-Open Publication No. 63-46308, there has been proposed a method in which a fixed heating means which does not rotate integrally with the seal roller is provided near the disk surface of the seal roller. In the vertical sealing device having this configuration, it is not necessary to provide a brush ring at the power supply section of the heating means, and it is possible to prevent a power supply trouble. However, since a method of indirectly heating the seal roller in which the heating means is disposed in proximity to the seal roller by radiant heat is adopted, heat loss is larger than that of the above-described structure in which a heater is integrally provided with the seal roller, There is an inherent problem that it takes more time to heat the oil to the optimum sealing temperature. In addition, by using a heating means having a large power consumption, it is possible to shorten the heating time, but in this case, there is a problem that manufacturing cost and running cost increase.

A technique disclosed in Japanese Utility Model Laid-Open Publication No. 6-86921 is one that can address the problems inherent in the above-described various conventional techniques. This device is configured such that a heating unit containing an induction coil for generating high-frequency electromagnetic radiation is fixedly arranged close to the outer peripheral surface of the seal roller, and the seal roller is directly heated by induction heating. That is,
Since the seal roller is directly heated by the high-frequency induction heating method, the heating time from the start of heating to the target temperature can be shortened, and the above-described improvement in heat loss has been made.

[0006]

However, in the above-described vertical sealing device of the high-frequency induction heating system, the outer peripheral surface (film sealing surface) of the constantly rotating seal roller is separated from the film holding portion by approximately half the circumference. Because of the configuration in which the heating unit is provided, heat is diffused by the air cooling effect accompanying the rotation of the roller, and it is expected that the temperature of the film holding unit will decrease. Therefore, it is necessary to heat the seal roller to a temperature higher than the target temperature in anticipation of a temperature drop so that the film sealing surface at the time of rotation of the seal roller becomes the optimum target temperature for sealing, and efficient heating is achieved. However, it is pointed out that the power consumption increases.

Further, since the high-frequency induction heating method is adopted, it is necessary to separately provide a cycle converter such as an inverter for changing the cycle from several kilohertz to several tens of kilohertz, and there is a disadvantage that the manufacturing cost increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned various disadvantages inherent in the vertical sealing device, and has been proposed in order to preferably solve the problems. An object of the present invention is to provide a vertical sealing device in a bag-making and filling machine capable of reducing the temperature and obtaining an optimum and stable sealing temperature, thereby enabling extremely good film sealing.

[0009]

SUMMARY OF THE INVENTION To overcome the above problems,
In order to achieve an intended purpose, the present invention is directed to a vertical sealing device for applying a vertical seal to an overlapped edge extending in a feeding direction of a cylindrically formed film, wherein the overlapped edge of the tubular film is provided. A pair of seal rollers disposed opposite to each other sandwiching the portion and sandwiching the film and rotated in opposite directions to each other,
Wherein it is detachably associated indirectly connected via the disc roller being attached directly or the roller on the seal roller, a rotary drive shaft for rotationally driving the sealing roller, or carbon steel
The formed a Ranaru magnetic as the material is fixedly disposed in proximity to one of the disc surface in the seal rollers or disc rollers, vortex the seal roller by electromagnetic radiation of a low-frequency
Heating means consisting of a cylindrical casing provided with an induction coil for generating a current , wherein each of the rotary drive shafts
It is characterized by being rotatably inserted through the casing with its axis coinciding with the central axis of the corresponding cylindrical casing.

[0010]

The overlapped edge of the cylindrically formed film is fed downstream by a pair of seal rollers sandwiching the edge. When a low-frequency current is applied to the induction coil of the heating means disposed in proximity to one of the disk surfaces of each seal roller or a disk roller to which the seal roller is detachably attached, an eddy current is generated in the seal roller and the eddy current is generated. The entire film sealing surface of the roller is heated in a short time. Therefore, the overlapped edge that is sandwiched between the pair of seal rollers and fed downstream is heat-sealed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a vertical sealing device in a bag making and filling machine according to the present invention. In the embodiments, a horizontal bag making and filling machine will be described as an example of a packing machine in which a vertical sealing device is adopted.However, the present invention is not limited to this, and is applied to a vertical bag making and filling machine. Is also applicable.

As shown in FIG. 1, a horizontal bag making / filling / packaging machine 10 according to an embodiment includes an object to be packaged 12 attached to an attachment 14.
Conveyor 16 for feeding downstream at predetermined intervals by the
It has. On the downstream side of the supply conveyor 16, there is disposed a bag making device 24 for forming a film 22 fed from the supply roll 20 by a pair of feed rollers 18, 18 into a cylindrical shape. Thing 1
2 is filled in a film 22 formed into a cylindrical shape. Further, the overlapped edge 22 in the longitudinal direction of the film 22 formed into a cylindrical shape.
A pair of feed rollers 26, 26 (only one is shown) are disposed on both sides of “a”, and the feed of the tubular film 22 is performed by the feed rollers 26, 26.

Downstream of the feed rollers 26, 26, a pair of seal rollers (vertical sealers) 28, 28 are connected via a support mechanism (described later) shown in FIGS.
, And each roller 28 is configured to be heated to a required temperature by a low-frequency induction heating type heating means 32 described later. Then, in a state where the seal rollers 28, 28 are heated to the target seal temperature (appropriate heating temperature) via the heating means 32, 32 controlled by the temperature control means 34 shown in FIG.
8, a center seal (longitudinal seal) is applied by pressurizing and heating the overlapping edge portion 22a.

Further, a pair of seals (end sealers) 30, 30 which are vertically opposed to each other across a horizontal film feeding path are provided further downstream of the seal rollers 28, 28. A heater (not shown) whose temperature is controlled via the temperature control means 34 is incorporated. Then, while the heater is heated to the target sealing temperature, an end seal is applied before and after the packaged object 12 of the tubular film 22 is sandwiched by the pair of seals 30, 30.
Is configured to be cut by the cutter 31 disposed in the first position.

A mechanism for supporting the seal rollers 28, 28 is provided on a fixed plate 36 disposed below the film feeding path in the packaging machine 10 and is spaced apart in a direction intersecting the film feeding direction across the path. A pair of holders 38, 38
(Only one is shown in FIG. 2) is provided, and a fulcrum shaft 40 is vertically inserted into and supported by each holder 38. Each fulcrum shaft 40
A support cylinder 44 for supporting the rotary drive shaft 42 of the seal roller 28 inside thereof
Are disposed so as to be horizontally swingable via the arm portion 44a protruding in the radial direction. At the upper end of the support cylinder 44, a mounting plate 46, one end of which is pivotally supported on the fulcrum shaft 40 so as to be horizontally swingable.
Is provided on the upper surface of the mounting plate 46. The heating means 3 includes an induction coil 48 for generating low-frequency electromagnetic radiation.
Two are arranged.

As shown in FIGS. 4 to 6, the heating means 32 includes an inner iron core 52 erected on the inner peripheral upper surface of the support ring 50, a part of which is cut radially, and an outer core 52. A cylindrical casing 56 is formed from the outer core 54 disposed on the side surface. The inner core 52 is formed in a cylindrical shape by winding a number of thin silicon steel sheets, and the outer core 54 is formed in a cylindrical shape by a plurality of arc-shaped segments 54a arranged at a required interval in the circumferential direction. And an annular space defined between the iron cores 52 and 54,
An induction coil 48 for generating a low-frequency electromagnetic ray by passing a low-frequency current of 0 Hertz is provided. In addition,
A heat insulating covering material 58 is attached to the inner and outer peripheral portions of the induction coil 48 facing the iron cores 52 and 54 and the bottom portion facing the support ring 50, respectively. Further, the upper end of the induction coil 48 is set to slightly lower than the upper ends of the iron cores 52 and 54 (see FIG. 4).

The center hole 50 of the support ring 50
4, a cylindrical spacer 60 having a flange 60a extending radially outward at one end in the axial direction, as shown in FIG.
Are inserted with the flange 60 a in contact with the lower surface of the support ring 50. The lower inner peripheral surface of the inner core 52 abuts on and is supported by the outer peripheral surface of the spacer 60 facing the center through hole 50a.

The center through hole 56a of the casing 56 and the center through hole 46a of the mounting plate 46 are set so as to coincide with the center through hole 44b of the support tube 44. Drive shaft 42 inserted through
The upper portion of the casing 56 faces through the central through hole 46a of the mounting plate 46 in the central through hole 56a of the casing 56 in a non-contact manner. At the upper end of the rotary drive shaft 42, as shown in FIG.
Into the central through hole 42a of the drive shaft 42,
It is mounted so that it can rotate integrally. The seal roller 28 is detachably mounted on the upper surface of the disk roller 62. The disk roller 62 is
A small gap is interposed between the lower surface and the upper surface of the casing 56, and is set so that eddy current is efficiently generated in the seal roller 28 by the low-frequency electromagnetic radiation generated in the induction coil 48. You. The diameter of the disk roller 62 is slightly with small set than the outer diameter of the casing 56, the lower surface of the disk roller 62, a thin annular portions corresponding to the installation position of the induction coil 48 copper 64 are provided. This copper plate 64 is used for the disk roller 6.
2 and the seal roller 28 so as to efficiently generate an eddy current. The seal roller 28 and the disk roller 62 are each formed of a magnetic material made of carbon steel or the like.

The seal roller 28 attached to each drive rotary shaft 42 via a disk roller 62 is a disk roller 6.
A flange 28a protruding radially outward is formed on the side (upper end) opposite to the side on which the two seal rollers 2 are disposed, and as shown in FIG.
The overlapping edge portions 22a are sandwiched between the outer peripheral sealing surfaces 28b, 28b of the flanges 28a, 28a at 8, 28. Then, both seal rollers 28, 28
Is heated by the heating means 32, 32, whereby the overlapping edge 22a sandwiched between the sealing surfaces 28b, 28b is heat-sealed.

As shown in FIG. 7, an adjusting nut 66 is provided on the one support tube 44, and a tension spring is provided between an end of the nut 66 and a screw 68 provided on the other support tube 44. And a pair of seal rollers 28, 28 formed by the springs 70.
Is set so that the overlapping edge portion 22a of the tubular film 22 is held at a predetermined pressure. The adjusting nut 6
By adjusting the tension of the tension spring 70 in step 6, the film holding pressure on the sealing surfaces 28b, 28b can be adjusted.

Sealer opening / closing levers 72, 73 are provided at the lower ends of the support cylinders 44, 44, and one extension portion 72a, which extends outward in the radial direction of the support cylinder 44, 44 of the lever 72, 73. 73a is pivotally supported by the lower projecting portions of the corresponding fulcrum shafts 40, 40 so as to be horizontally swingable. Further, an extension 7 extending to the opposite side to the extension 72a, 73a pivotally supported by the fulcrum shafts 40, 40 of the sealer opening / closing levers 72, 73.
Followers 74 are rotatably supported by 2b and 73b, respectively. As shown in FIG. 7, a sealer opening / closing cam 77 having a shape shown in FIG. 7 is integrally rotatable on an output shaft 76a of the motor 76 which is disposed on the fixed plate 36 via a bracket 75 and a motor plate 90. It is arranged in. The sealer opening / closing cam 77 is provided with the followers 74, 7
The follower 74 faces between the extending portions 72b, 73b pivotally supported, and the followers 74, 74 are configured to be able to engage and abut on the cam surface of the sealer opening / closing cam 77. That is, by energizing the motor 76 in the forward and reverse directions to rotate the sealer opening / closing cam 77 in the forward and reverse directions, the cam 77 and the followers 74, 74 are rotated.
And a pair of sealer opening / closing levers 72 and 73
Move toward and away from each other with the fulcrum shafts 40, 40 as fulcrums, whereby the pair of seal rollers 28, 28
It is configured to move between a close position (seal position) close to each other and an open position separated from each other.

The one sealer opening / closing lever 73 has, at a free end extending further outward from an extension 73b on which a follower 74 is pivotally supported, a tension spring 78 having one end locked to the motor plate 90. Is locked at the other end. The knob bolt 80 is attached to the motor plate 90 via the holder 79.
The tension spring 78 urges the knob bolt 80 so that the free end of the extension 73 b of one of the sealer opening / closing levers 73 abuts, and the film holding position of the seal rollers 28, 28 is held. Is positioned.

A position confirmation sensor 81 is provided on the motor plate 90. The sensor 81 includes a sealer opening / closing cam 77.
The detection piece 82 provided integrally with the sensor is set to be detectable, and the opening and closing of the sealer opening / closing levers 72, 73 (seal rollers 28, 28) can be confirmed by the detection state of the detection piece 82. is there.

The holders 38, 38 of the two fulcrum shafts 40, 40
Drive gears 83, 83 are rotatably disposed at portions protruding downward from the support gear 44. Each drive gear 83 includes a driven gear 84 disposed at a portion protruding downward from the support cylinder 44 of the corresponding rotary drive shaft 42. Are engaged. That is, if one of the driving gears 83 is rotationally driven by a driving means (not shown), the driven gears 84, 84 rotate in mutually opposite directions via the driving gears 83, 83, whereby the pair of seal rollers 28, 2
8 also rotate in the opposite directions to feed the cylindrical film 22 to the downstream side. The drive gear 83 and the driven gear 84 of each set are connected to the sealer opening / closing lever 7.
It is configured such that the meshing state is always maintained even when the 2,73 is opened and closed.

Each seal roller 28 has a seal surface 2
Inside the vicinity of 8b, there is provided a temperature detecting means 86 composed of a thermocouple or a thermistor for detecting the current temperature of heating the film. At the lower end of each of the rotary drive shafts 42, a brush ring 87 for relaying the temperature detection means 86 is provided, and a lead wire (not shown) of the temperature detection means 86 is wired through the center through hole 42a of the drive shaft 42. The brush ring 8
7 is connected. The seal opening / closing lever 7
Brushes 89, 89 are provided at the holders 2, 73 via holders 88, 88, and each brush 89 comes into contact with a corresponding brush ring 87. Each brush 89 is connected to the temperature control means 34, and temperature data detected by each temperature detection means 86 is input to the temperature control means 34. Then, the temperature control means 34 compares the target seal temperature (appropriate heating temperature) with the sequentially inputted current temperature, and makes the heating means 32, 32 so that the two temperatures match.
Is configured to be operated. In addition, the target sealing temperature corresponding to the packaging film and the number of rotations of the packaging is input and stored in the temperature control unit 34 in advance.

[0026]

Next, the operation of the vertical sealing device according to the embodiment configured as described above will be described. Induction coil 48 of heating means 32 arranged close to each of said seal rollers 28
By causing a low-frequency current to flow, an eddy current is generated in the seal roller 28, and the roller 28 is induction-heated. The current temperature of the seal roller 28 is input to the temperature control means 34 via the temperature detection means 86, and heating is continued until the measured temperature matches the target seal temperature. When the sealing of the overlapping edge portion 22a of the tubular film 22 is started in a state where the seal roller 28 is heated to the target sealing temperature,
The overlapped edge portion 22a sandwiched between the sealing surfaces 28b of the two seal rollers 28 and fed to the downstream side is heat-sealed.

The seal rollers 28, 28 are rotated in opposite directions so as to feed the overlapped edge 22a of the tubular film 22 to the downstream side. Reference numeral 28 denotes a sealing surface 28 provided by a heating means 32 disposed close to the lower disk surface of the disk roller 62.
Since the entire b is always induction-heated, heat loss can be reduced and sealing failure due to a temperature drop at the film holding position can be prevented. In addition, the temperature of the seal roller 28 is always kept at the target seal temperature by the temperature control means 34, so that the overlapping edge 22a can be stably sealed.

The heating means 32 is a seal roller 2
8, the power can be supplied without a brush ring or the like,
Power troubles can be eliminated, and the structure is simplified and maintainability is improved. In addition, since the low frequency induction heating type heating means 32 is used, there is no need to provide a cycle converter, so that the manufacturing cost can be reduced.

Here, as shown in FIG. 10, in a conventional vertical sealing device in which a casting roller 94 is provided inside heating rollers 93, 93 connected to a pair of sealing rollers 92, 92, the temperature of the sealing roller 92 is increased. The control is performed by inserting the temperature sensor 95 in the immediate vicinity of the sealing surface of the roller 92. However, since the heater 94 is arranged on the opposite side of the sealing surface with respect to the temperature sensor 95, even when the temperature rises, Due to the time lag, it is difficult to accurately maintain the sealing surface at the target sealing temperature even when descending, and it is particularly difficult to heat seal a thin film. On the other hand, in the vertical sealing device of the induction heating type according to the embodiment, since the seal roller 28 itself generates heat, the time lag is small with respect to the target sealing temperature, the temperature of the sealing surface 28b can be accurately maintained, and the thin film 22 can be maintained. However, good heat sealing is possible.

[0030]

[Experimental Example] In the vertical sealing device of the embodiment shown in FIG. 4 and the vertical sealing device according to the prior art of the casting heater system shown in FIG. 10, each seal roller 28, 92 is heated from room temperature to 200 degrees Celsius. FIG. 8 is a graph showing the measurement results of the temperature rise at this time and the temperature fall from 200 degrees Celsius to room temperature.

That is, in the experiment, the temperature rise characteristic of the seal roller 28 of the embodiment when an electric current is applied to the induction coil 48 is faster than that of the cast heater system, and the rise time from room temperature to 200 degrees Celsius is longer than that of the cast heater system. It took 13 minutes, but the induction heating method reduced the time to 8 minutes, the ratio was reduced to about 62%, and the power consumption at that time could be reduced to about 62%. The fall time constant obtained from the measurement result of the fall time when the current is turned off is 27 minutes in the induction heating method compared to 37 minutes in the conventional casting heater method, and the heat capacity of the induction heating method is the casting heater. It can also be seen that it is about 73% compared to the system. Therefore, the temperature falling characteristic in the induction heating method rapidly decreases in reverse to that at the time of rising, so that it is possible to reduce a time loss at the time of changing the setup such as a packaging ability.

In the experimental example, the temperature of the casing 56 in the heating means 32 of the induction heating type was slight, and rose only to about 70 degrees Celsius.

In a packaging test using a plastic packaging material to which aluminum foil was bonded, when the induction heating capacity was equivalent to 300 watts and the temperature of the seal roller 28 was set at 300 degrees Celsius, the speed was 36 meters per minute. For a long time. This is equivalent to the speed at which a pillow-type package having a length of 180 mm is packed at a capacity of 200 pieces per minute. When this was performed by the casting heater system shown in FIG. 10, the temperature of the seal roller 92 during continuous operation could not be maintained at 300 degrees Celsius continuously.

[0034]

FIG. 9 shows a vertical sealing device according to another embodiment. Since the basic structure is the same as that of the above-described embodiment, only different portions will be described. As shown in the figure, an annular heat pipe 85 filled with a working fluid for generating an evaporative gas by being heated is disposed at an internal position close to the seal surface 28b of each seal roller 28. The temperature distribution of the seal surface 28b of the seal roller 28 heated by the heat roller 32 is made uniform. In this way, by providing the heat pipe 85 functioning as a heat equalizing means in the seal roller 28, it is possible to further stabilize the seal of the overlapped edge 22a which is heat-sealed by the seal rollers 28, 28. Become. That is, at the time of heat sealing of the overlapped edge portion 22a, each seal roller 28 which is induction-heated by the heating means 32 is heated by the heat pipe 85 disposed inside the seal surface 28b in the vicinity of the seal surface 28b.
8b, the temperature distribution over the entire circumference is kept uniform, and the amount of heat taken by the film 22 during sealing is minimized.
A stable and good seal is achieved.

In this embodiment, the temperature of the roller is detected by installing the temperature detecting means 86 in the seal roller 28.
The present application is not limited to this. For example, as shown by a two-dot chain line in FIGS. 2 and 3, an infrared type temperature detecting means 91 capable of measuring the temperature in a non-contact manner is provided in the vicinity of the sealing surface 28b of the sealing roller 28. The measured current temperature of the seal roller 28 can be input to the temperature control means 34 to control the temperature of the heating means 32. In this case, a brush ring or the like related to the temperature detecting means 91 can be omitted, and it is possible to eliminate the occurrence of troubles such as defective contacts.

Further, in the embodiment, the seal roller 28 and the disk roller 62 are formed separately, but both rollers may be formed integrally. Further, instead of disposing a heat pipe filled with a working fluid as the temperature equalizing means, an annular passage may be formed in the seal roller and the working fluid may be filled in the passage.

[0037]

As described above, according to the vertical sealing device in the bag making and filling machine according to the present invention, since the heating means for heating the seal roller is fixedly arranged, the power supply brush ring is provided. It is not necessary, and power supply troubles due to abrasion or poor contact of the brush contacts can be prevented. In addition, since the heating means is disposed close to the disk surface of the seal roller or the disk roller to which the roller is detachably attached, the entire roller is always directly heated even during rotation of the seal roller. This makes it possible to significantly reduce the heat loss and the power consumption.

In addition, by employing a low frequency induction heating system at 50 to 60 Hz, there is no need to separately provide a cycle converter for induction heating. Furthermore, since the induction heating method is used, the seal roller itself serves as a heat source, and the amount of heat deprived of the film when the packaging machine starts operation after stopping is replenished quickly, so that a stable seal can be achieved.
Furthermore, the temperature of the seal roller is controlled by temperature control means.
Since the target sealing temperature is always maintained,
A stable sealing of the edges is achieved. In addition, by adopting a non-contact temperature detecting means as a means for detecting the seal surface temperature of the seal roller, a brush ring for the temperature detecting means can be omitted, and the configuration is simplified. Also, the seal roller is heated by the heating means.
So that the temperature distribution on
By doing so, the seal at the overlapping edge can be made more stable.
Can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a horizontal bag-making filling and packaging machine provided with a vertical sealing device according to an embodiment.

FIG. 2 is a side view showing the vertical sealing device according to the embodiment, partially cut away.

FIG. 3 is a plan view of a main part of the vertical sealing device according to the embodiment.

FIG. 4 is a vertical sectional front view showing an arrangement portion of a seal roller and a heating unit according to the embodiment.

FIG. 5 is a plan view of a heating unit according to the embodiment.

FIG. 6 is a bottom view of the heating unit according to the embodiment.

FIG. 7 is a cross-sectional plan view of a main part of the vertical sealing device according to the embodiment.

FIG. 8 is a graph showing the results of an experimental example.

FIG. 9 is a vertical sectional front view of a main part of a vertical sealing device according to another embodiment.

FIG. 10 is a vertical sectional front view of a main part of a vertical sealing device according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 22 film 22a overlapping edge 28 seal roller 28b sealing surface 32 heating means 34 temperature control means 42 rotation drive shaft 48 induction coil 56 casing 64 disk roller 85 heat pipe (soaking means) 86 temperature detecting means (contact type) 87 Brush ring for relay 89 Brush 91 Temperature detection means (non-contact type)

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kiyoshi Seko 4-380 Nakaodai, Nishi-ku, Nagoya-shi, Aichi Examiner at Fujikikai Nagoya Plant Satoru Ichinose (56) References JP-A-5-310226 (JP, A JP-A-6-255630 (JP, A) JP-A 51-97075 (JP, U) JP-A 63-46308 (JP, U) JP-A 56-26612 (JP, U) JP-A 86921 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 51/10-51/30 B29C 65/04

Claims (4)

(57) [Claims] 1. A vertical sealing device for applying a vertical seal to a superposed edge portion (22a) extending in a feeding direction of a cylindrically formed film (22), the superposition of the cylindrical film (22). A pair of seal rollers (28, 28) that are disposed opposite to each other with the edge (22a) therebetween, and that rotate in opposite directions while sandwiching the film (22); A rotary drive shaft (42) that is indirectly connected to the roller (28) directly or via a disk roller (62) detachably attached to the roller (28), and that rotationally drives the seal roller (28); The seal roller (28) or the disk roller (62), which is formed of a magnetic material made of carbon steel or the like, is fixedly disposed in the vicinity of one of the disk surfaces and is exposed to low-frequency electromagnetic radiation .
The induction coil (4
8) heating means (3) consisting of a cylindrical casing (56) with
2), wherein each of the rotary drive shafts (42) has its casing aligned with the central axis of the corresponding cylindrical casing (56).
(56) A vertical sealing device in a bag making and filling machine, which is rotatably inserted through (56). 2. Each of said seal rollers (28) is provided with said roller (2).
A temperature detecting means (86) for measuring the temperature of 8) is provided, and a brush ring (87) for relay of the temperature detecting means (86) is mounted on a rotary drive shaft (42) of the seal roller (28). A brush (89) is provided in contact with the brush ring (87), and a seal roller (28) is provided based on a current temperature measured by the temperature detecting means (86) and a preset target seal temperature. )
2. The vertical sealing device in a bag making and filling machine according to claim 1, further comprising a temperature control means (34) for controlling the temperature of the hopper to an optimum temperature. 3. A temperature detecting means (91) for measuring a temperature of a sealing surface of each of the seal rollers (28) in a non-contact manner, wherein a current temperature measured by the temperature detecting means (91) and a preset input are set. Seal roller (28) according to the set target seal temperature
2. The vertical sealing device in a bag making and filling machine according to claim 1, further comprising a temperature control means (34) for controlling the temperature of the hopper to an optimum temperature. 4. The seal roller (28) is provided with the roller (28).
Annular soaking means (8) close to the sealing surface (28b) of
5. A vertical sealing device in a bag making and filling machine according to claim 1, wherein 5) is provided.