JPH0512140B2 - - Google Patents

Abstract

PURPOSE:To enable an accurate cylindrical formation by providing an apparatus for welding and forming both selvages of a film strip cylindrically with a mechanism for detecting and correcting the positional deviation thereof before the sealing positon. CONSTITUTION:A film strip 1 withdrawn from a reel 11 is rolled cylindrically so as to overlap both selvages 1a thereof together and the overlapped parts are welded together. In an apparatus with such a mechanism 77, a film selvage end detection mechanism 68 is provided in front of a welding section of the welding mechanism 77 to detect the positional deviation of the selvages 1a of the film 1 and additionally, a zigzag correction mechanism 59 is provided to adjust the lateral position thereof with respect to the direction of carrying the film strip 1 according to signals from the mechanisms. For example, a moving base 64 having a number of film carrying rollers 65 provided slidably sideways on a fixed base 63. The film selvage end detection mechanism 68 is preferably composed of a central photoelectric tube 72 and a photoelectric tube 73 at the eccentric positon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical sealing device that welds both edges of a film strip to form a cylindrical shape. The purpose is to ensure that an accurate seal condition is obtained.

In recent years, a format has been adopted in which an exterior material serving as a label is formed into a cylindrical shape using a heat-shrinkable film, and this is tightly fitted onto a container by shrink molding to display contents, etc.

This exterior material is formed from a band-shaped film, and is formed into a cylindrical shape by polymerizing and bonding the front side of one edge of the band-shaped film to the back of the other edge.
There are heat sealing methods, solvent methods, etc., but the ultrasonic sealing method, which allows for more reliable sealing, is attracting attention.

Alignment of both ears is an essential requirement for any sealing method, but alignment of both ears is particularly required when sealing a foamed film using an ultrasonic sealing method. In other words, since foamed film is a transversely shrinkable film, its elongation rate in the vertical direction easily changes with respect to tension, and the difference in thickness in the vertical direction is large, making it susceptible to the effects of temperature, humidity, etc. Due to these properties, there is a problem in that the seal tends to meander before the sealing operation is performed, and it is difficult to maintain straightness at the sealing position.

If the film snakes at the sealing position, the welded part will move inward from the edge, causing the edge to spring up or the width of the welding area to decrease.
This may result in sealing errors or failure to form a normal seal.

The present invention enables accurate sealing of thermoplastic films including such foamed films, and is characterized by the fact that the strip-shaped film 1 supplied from the raw film reel 11 is sealed in a tube. In a cylindrical sealing device having a sealing mechanism 77 that overlaps and welds both edge portions 1a while rolling them into a shape, film edge detection detects a positional shift of the edge portion 1a of the strip film 1 in front of the sealing position of the sealing mechanism 77. Mechanism 68; moving table 64 on fixed table 63;
A plurality of rolling rollers 65 are provided on the moving table 64 to guide the feeding of the film strip 1, and a plurality of rolling rollers 65 are provided on the moving table 64 so as to be slidable in the horizontal direction. A position regulating member 66 for setting the position of the belt-shaped film 1 and a tension adding member 67 for applying tension in the feeding direction to the film strip 1 are provided, and the movable stage 64 is slid by a detection signal from the film edge detection mechanism 68. A meandering correction mechanism 59 is provided for adjusting the lateral position of the film strip 1 in front of the film edge detection mechanism 68.

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

Figures 1 and 2 show a film strip 1 that is fed in the longitudinal direction and rolled into a cylindrical shape, cut into a certain length, and then fitted onto an object to be used as an exterior material. The entire exterior material forming machine 2 is shown, and various films such as thermoplastic film, thermoplastic shrink film, foamed films thereof, and thermoplastic foam shrink film having a skin layer are used as the strip film 1. Preferably, it is relatively thick and has a label, design, etc. printed on its surface.

The cylindrical exterior material forming machine 2 is roughly divided into a film supply section A that feeds the film 1 at a constant speed, a film control section B that corrects meandering and tension of the film 1 during feeding, and a film control section B that folds the strip film 1. A sealing part C forms a cylinder by welding both ears 1a (side edges) of the film while bending, an accumulation part D controlling the feeding speed of the cylindrical film 1', and a sealing part C for feeding the cylindrical film 1'. It has a cutting section E that cuts the unit cylindrical film 1'' into a fixed size while being fed, and a mounting section F that opens the cut unit cylindrical film 1'' into a substantially cylindrical shape and fits it onto an object 3 such as a container.

The cutting mechanism 4 and dancer roll mechanism 5 of the cutting section E, the suction mechanism 6 of the mounting section F, the hot air shrink mechanism 7, the transport mechanism 8 for the object 3, etc. are commercially available products that are combined as a set of labelers. are using.

The film supply section A includes two sets of reel rotation mechanisms 12 for stacking and placing raw film reels 11 wound with strip-shaped films 1 in a plurality of stages and for rotating the reels;
Film 1 unwound from one reel rotation mechanism 12
a guide mechanism 13 that feeds the film to the film control unit B while twisting it by 90 degrees; a supply amount adjustment mechanism 14 that keeps the tension of the unwound film 1 constant; and a stacked film reel 11 in each reel rotation mechanism 12.
The reel rotation mechanism 1 detects the film stage shift between
2.

The two sets of reel rotation mechanisms 12 are selectively operated by a changeover switch, and when the reel 11 of one film 1 is completely consumed and the reel 11 is replaced, the film is fed from the other set to continuously supply the film. It is provided for the purpose of carrying out the same purpose, and has the same structure.

2 to 8, each reel rotation mechanism 12 has a stacking member 18 and a clamper 1 attached to a vertical drive shaft 17 that is rotationally driven by a motor 16.
The raw fabric reel 11 is passed through an unwinding tool 20 consisting of
are stacked in multiple tiers.

The stacking member 18 is formed into a disk shape, and a boss portion 18a thereof is attached to the drive shaft 17 via a key 21, and a clamper 19 is placed on the upper surface side. This clamper 19 has a slit 19b in a boss portion 19a to which a key 21 is attached to the drive shaft 17.
A clamper arm 22 is fixed to one end of the boss portion 19a, and a bracket 23 is fixed to the other end of the boss portion 19a.By pressing a screw 24 provided on the bracket 23 against the clamper arm 22, the boss portion 19a is fixed.
It has become possible to increase the outer diameter of a,
The diameter of the paper tube insertion portion 19c of the boss portion 19a is increased, and the paper tube 11 of the raw fabric reel 11 fitted therein is
a is tightened to enable the original fabric reel 11 to rotate integrally with the drive shaft 17. Thereby, it is possible to prevent the film reel 11 from slipping and becoming misaligned, and from cutting the film.

The clamper arm 22 of the clamper 19 is longer than the radius of the film reel 11, and prevents the film 1 from slipping down from the film reel 11, which is disposed at a gap H from the upper surface of the stacking member 18.

The film tail end 1b of the original film reel 11 is connected to the paper tube 11.
It protrudes in the axial direction from the outer periphery a and is disposed within the gap H, and the film tail end 1b is connected to the film tip 1c of the lower raw material reel 11 via an adhesive tape, and When the reel 11 is exhausted, the supplied film is transferred to the lower raw film reel 11, and continuous supply is performed without stopping the rotation of the drive shaft 17.

The raw fabric reels 11 can be stacked, for example, in 5 to 7 stages on each reel rotation mechanism 12. However, if the drive shaft 17 is made long, all the fabric reels 11 are lifted to a high position and then stacked on the drive shaft 17. They must be fitted, which is a heavy task.

Therefore, as shown in FIG. 6, the drive shaft 17 is divided into parts, and is configured such that after the original fabric reel is fitted to the lower drive shaft 17, the upper drive shaft 17' is connected to the lower drive shaft 17. That is, a spigot part 25 and a rotation stopper groove 26 are formed at the lower end of the upper drive shaft 17'. The section 25 is inserted and connected.

The strip-shaped film 1 unwound from each reel rotation mechanism 12 is attached to four vertical rollers 31, 32, 33, 34 supported by a guide frame 30 of a guide mechanism 13.
and reaches the film control section B via the exit roller 35. The vertical roller 34, together with the exit roller 35, serves as a guide roller for changing the direction of the film, and feeds the film 1 by twisting it through 90 degrees.

These rollers 34, 35 and other rollers 31, 3
2 and 33 are fixed rollers or freely rotatable rollers, which are appropriately selected depending on the properties of the film used and the number of stages of the film reel 11. That is, in the case of a foamed film that is easily affected by tension, a freely rotatable roller that has the effect of reducing tension is preferable, and when the film reel 11 has multiple stages and the film enters at a larger angle of inclination, a fixed roller is preferable.

The vertical roller 34, which serves as an entrance roller for the film twisting portion, is adjustable in position in the direction of arrow J in FIG. 2, so that the lateral position of the film 1 entering the film control section B can be adjusted. .

That is, the film 1 unwound from the reel rotation mechanism 12 is made up of raw film reels 11 stacked in multiple stages.
Since the film unwinding position changes in height, the film that enters the vertical roller 31 from the horizontal direction and the film that enters the vertical roller 31 from above or below at an angle are different from each other.
Due to differences in tension and resistance, the film may deviate laterally when exiting from the exit roller 35, and this so-called meandering occurs when the film exits from the exit roller 35.
Although it is modified, in order to feed more accurately,
A position detection member 36 consisting of two phototubes is provided in front of the exit roller 35 to detect the deviation of the exiting film, move the vertical roller 34 in the direction of arrow J, and move the film passing through the exit roller 35. The lateral position of is corrected. In this case, the exit roller 3
5 is fixed at an intermediate position of the stacking height of the original film reels in order to minimize the effect of tension on the film.

Another means for correcting the lateral position of the film is to move the drive shaft 17 up and down in the axial direction.
Of the original film reels 11 on the drive shaft 17, the original film reel 11 in use is set at a constant height so that the film is always unwound from the same position, or
Alternatively, move the exit roller 35 up and down to the same position as the original fabric reel 11 in use, and
3. Make the height of the film that enters and the height of the film that exits the same.

In FIGS. 2, 7, and 8, the supply amount adjustment mechanism 14
supports a dancer roller 39 via an arm 38 on a rotatable vertical shaft 37, and a coil spring 41
by applying rotational force in the direction of arrow K to the vertical shaft 37, the vertical rollers 32,
It gives tension to film 1 between 33 and 33.

The motor 16 of the reel rotation mechanism 12 is a variable speed motor with an electromagnetic brake. The film reel 11 has a maximum diameter at the beginning of use, and decreases as the film is used, so the drive shaft 17
It is necessary to gradually increase the rotational speed of the film to keep the film unwinding speed substantially constant.

Therefore, an arm position detecting member 40 such as a resistor is provided to detect the position of the arm 38, and detects that the arm 38 rotates in the direction of arrow L due to an increase in tension due to a decrease in the film unwinding speed. Motor 1 so that 38 returns to the set position.
6 is controlled.

The stage feed mechanism 15 includes a drive shaft high-speed rotation detection member 43 operated by the dancer roller 39, a stopper 44 that sets the rotation limit of the dancer roller 39 by a coil spring 41, an air cylinder 45 for preventing hunting, and each reel rotation mechanism 12. It has a film stage shift detection member 46 provided therein.

When the film on the film reel 11 in use approaches its minimum diameter, the film unwinding speed adjustment by increasing the motor speed of the supply amount adjustment mechanism 14 cannot keep up, and the dancer roller 39 deviates from the adjustment range due to high tension. and move to the solid line position in Figure 7. A drive shaft high speed rotation detection member 43 is provided to be activated when this deviation occurs.

This detection member 43 is formed of a limit switch or the like, and when activated, the detection member 46
Activate. The detection member 46 is formed of a transmission type phototube or the like, and detects the film unwound from the smallest diameter.

When the film on the film reel 11 in use is exhausted and the film is transferred to the next film reel, the tail end 1b and tip 1c of the film are connected, and the drive shaft 17 rotates at high speed. However, as the film is unwound from its maximum diameter, the unwound film becomes slack and the tension becomes zero, so the dancer roller 39 is moved in the direction of arrow K in FIG. 7 by the action of the coil spring 41. It moves and hits the stopper 44.

When the film 1 moves from the M state to the N state in FIG. 7, the operating detection member 46 detects the change in state and operates the electromagnetic brake of the motor 16.
The drive shaft 17, which was rotating at a high speed, is braked to reduce its rotational speed to a speed that is approximately suitable for unwinding the maximum diameter film. When this rotational speed decreases, tension of the film also occurs, so the tension is adjusted by the supply amount adjustment mechanism 14.

Furthermore, the air cylinder 45 is operated via the electromagnetic valve 47 in response to a film stage shift detection signal from the detection member 46 . This air cylinder 4
5 is connected to the arm 38, and the coil spring 4
1 presses the dancer roller 39 toward the stopper 44 when it collides with the stopper 44, thereby preventing hunting due to rapid rotation. Reference numeral 48 indicates a control box for the motor 16.

The film control section B to the sealing section C are built into the apparatus frame 51, and the speed of the film 1 is controlled by a film feeding mechanism 55 composed of an entrance pinch roller 52, a central pinch roller 53, etc. while feeding at a substantially constant speed. Although the two pinch rollers 52 and 53 can be driven by separate motors, here they are driven by a motor 56, and the
6 and the inlet pinch roller 52 is a differential device 5
7 is provided, and is configured to adjust the tension by changing the rotational speed of the inlet pinch roller 52 with reference to the rotational speed of the central pinch roller 53. Further, an exit pinch roller 54 is provided at the rear of the accumulation section D, and a motor 62 that drives the exit pinch roller 54 drives a feed roller of the cutting section E via a differential gear.

The film control section B includes an entrance pinch roller 52.
It has a sag detection mechanism 58 and a meandering correction mechanism 59 located behind the. The sag detection mechanism 58 is for adding sag to the film 1 and removing tension distortion accumulated in the previous processes, and can operate the differential device 57 to keep the amount of sag approximately constant. It has an upper limit detector 60 that sets the upper limit of the slack portion, and a lower limit detector 61 that sets the lower limit, and the upper limit detector 60
When it turns OFF, the rotational speed of the inlet pinch roller 52 is increased to increase the amount of film fed out, and when the lower limit detector turns ON, the amount of film fed out is decreased, and as a result, the tension of the film entering the meandering correction mechanism 59 is Always maintained.

The meandering correction mechanism 59 has a movable base 6 on a fixed base 63.
4 is mounted so as to be slidable in the lateral direction (film width direction), and a plurality of rolling rollers 65 are provided on the moving table 64 to guide the feeding of the film. and a tension adding member 67.

The position regulating member 66 is for setting the lateral position of the film relative to the moving stage 64, and therefore, the lateral position of the film can be adjusted by lateral sliding of the moving stage 64.

The tension adding member 67 applies tension to the film in the feeding direction by pinching the film with felts placed above and below the film.

The meandering correction mechanism 59 corrects the meandering of the film entering the ultrasonic sealing mechanism of the sealing portion C in advance, and has a film edge detection mechanism 68 disposed within the sealing portion C.

In the edge detection mechanism 68 shown in FIGS. 9 and 10, the film in the seal portion C has a cylindrical shape as described later, and the upper edge of the edge portion 1a overlaps with a gap. Detect location.

A rotating body 69 has a worm wheel 70 formed on its outer periphery, and is rotatable by a worm gear 71. A central phototube 72 is provided at the center of rotation, and an eccentric phototube 73 is provided at an eccentric position. Reflective phototubes are used for the phototubes 72 and 73, and the central phototube 72 detects the ear portion 1a.
The eccentric phototube 73 is shifted by a distance Q in a direction perpendicular to the film feeding direction P, and is in a position where it does not detect the ear portion 1a.By rotating the rotating body 69, the position of the eccentric phototube 73 can be adjusted. change,
The distance Q can be adjusted, and this distance Q is the edge detection width, and the shorter the distance, the higher the detection accuracy.

When the central photocell 72 turns from ON to OFF, the ear part 1
When a rightward meandering (FIG. 9) of a is detected and the eccentric phototube 73 is turned from OFF to ON, a leftward meandering is detected and a detection signal is sent to the meandering correction mechanism 59 to slide the movable table 64, The position of the film is corrected in the lateral direction via the position regulating member 66.

An air chamber 74 is formed in the rotating body 69, and compressed air is supplied from the outside to light emitting ports 72a, 73 of the phototubes 72, 73.
Air is blown out from b. By blowing out air, dust attached to the film or floating around it is removed, and the photocell 7
2,73 to prevent malfunction.

It is best for the edge detection mechanism 68 to detect the edge of the film which is completely bent into a cylindrical shape immediately before sealing, but it may also detect the edge of the film which is half-folded just before the seal.

Note that since the overlapping lower ear is separated from the upper ear, there is no detection by the eccentric phototube 73. Further, the phototube 72 may also be arranged at a position eccentric from the center of the rotating body 69.

The details of the seal part C are 11th, 12th, 13th,
As shown in FIG. 14, an ultrasonic sealing mechanism 77 and film bending members 78, 7 arranged before and after the ultrasonic sealing mechanism 77 are shown.
9.

The front film bending member 78 is for bending a strip-shaped film into a semi-cylindrical shape, and conventionally a triangular plate is used.
0.81 is used. The feeding direction of the film strip 1 that has come out of the meandering correction mechanism 59 is turned substantially downward by the direction changing bar 82, and the film strip 1 is fed by the half-folding roller 8.
0 into an approximately dogleg shape, and the auxiliary roller 8
1 to the cylinder forming member 83 of the sealing mechanism 77. It is preferable that each set of rollers 80, 81 is composed of a plurality of rollers.

In the ultrasonic sealing mechanism 77, a sealing roller 84 having a knurled outer periphery is disposed inside a cylinder forming member 83 which is formed into a substantially rectangular cylindrical shape and whose size is adjustable. protrudes from the window 85, and is interlocked via a transmission means 86 so that the peripheral speed is the same as the film feeding speed. Furthermore, the pressure force of the seal roller 84 against the surface roller 88 can be adjusted by a pressure adjustment means 87.

Reference numeral 89 denotes a vibrating roller arranged in a case 90, whose shaft 91 is rotationally driven while giving vibration in the axial direction.The surface roller 88 is provided at the tip of the vibrating roller 89, and the eccentricity of the surface is The overlapping edge portion 1a of the film 1 formed into a cylindrical shape at the position and the outer peripheral surface of the seal roller 84 is continuously welded.
The relationship between the seal roller 84, the surface roller 88, and the film feeding speed is appropriately set to a synchronous speed or separate speeds, taking into consideration the slipperiness of the film used.

FIG. 18 shows the temperature control mechanism 9 of the sealing mechanism 77.
3 is shown. In this temperature control mechanism 93, when the vibrating roller 89 generates heat due to continuous operation and the temperature rises, the film 1 meandering and the seal state change, making it difficult to maintain uniform seal strength and seal appearance. Therefore, the temperature rise of the vibrating roller 89 is controlled to maintain the temperature within a constant range that does not affect the sealing operation.

94 is a temperature sensor formed by providing a thermocouple 96 isotemperature sensing body in a metal piece 95 that is in sliding contact with the outer peripheral surface of the surface roller 88; 97 is a cold air generator that sends cold air into the case 90; Compressed air can be supplied from an air compressor via a solenoid valve 98, a pressure regulating valve 99, a moisture remover 100, etc., and a temperature rise detection signal from the temperature sensor 94 is sent via a temperature controller 101. to control the electromagnetic valve 98 and inject cold air to the vibrating roller 89 to cool it down.

The metal piece 95 of the temperature sensor 94 is formed into a block shape from a material with good thermal conductivity, is swingably supported by a pin 102, and is pressed against the surface roller 88 by its own weight. A contact type sensor may also be used. Incidentally, by making the ultrasonic output as high as possible and making the pressing force of the seal roller 84 as weak as possible, the meandering of the film can be further reduced.

The ultrasonic sealing mechanism 77 seals the overlapping ear portion 1a.
The film 1', which has been sealed and has a cylindrical shape, is folded into a two-fold shape (the cylindrical shape is compressed into a sheet shape) by a wedge-shaped rear film bending member 79, and then the film 1' is folded into a two-fold shape (the state in which the cylindrical shape is compressed into a sheet shape). 108 and enters the central pinch roller 53.

This central pinch roller 53 is connected to the cylindrical film 1'.
Unlike the case of the inlet pinch roller 52, a seal portion S is formed on the film 1', and a circumferential groove is provided in the center so that a constant tension can be applied. 53a (shown in FIG. 12) is formed.

The storage section D is arranged to connect the sealing section C, the cutting section E, and the mounting section F in an online manner. Attachment 3
While the unit cylindrical film 1'' is supplied intermittently, the cylindrical film 1' passing through the seal portion C is supplied continuously, and there is a difference between continuous operation and intermittent operation. Differences in film feeding speed tend to occur between the two, and it is necessary to absorb this speed difference to provide continuity.

In FIGS. 1 and 2, the aquiyum part D includes the aquiyum mechanism 106 and the dancer roll mechanism 107.
is provided. The storage mechanism 106 includes a plurality of upper rollers 109 supported on the upper part of the machine frame 108 and the same number of lower rollers 111 supported on supports 110 provided on the machine frame 108 so as to be movable up and down. The cylindrical film is wound sequentially between upper and lower rollers 109 and 111, and the length of the stored film becomes shorter when the support body 110 is placed in the upper position, and becomes longer as the support body 110 is placed in the lower position.

The dancer roll mechanism 107 has two rollers 11 mounted on an auxiliary machine frame 112 fixed to the side of the machine frame 108.
8, and a dancer roller 114 is arranged below the middle thereof, and a support body 115 provided with this dancer roller 114 is movable up and down with respect to the auxiliary machine frame 112, and the positions of the support body 115 at multiple locations above and below are detected. An accumulation amount detector 116 is provided.

The sealing speed of the sealing section C is always constant, and when the amount of film taken up changes due to a change in speed at the cutting section E and the mounting section F, for example, the conveyance speed of the object 3 to be mounted changes, the tension changes. Correspondingly, the dancer roller 114 moves up and down, and when the dancer roller 114 moves upward, the detector 116a detects this and operates the accumulator mechanism 106 to raise the support 110, and conversely, the dancer roller 114 lowers. and detector 116b
is detected and lowers the support body 110, whereby the dancer roll 114 in the dancer roll mechanism 107 is located at approximately the set position (approximately at the center).

Further, the above-mentioned accumulation part D is particularly useful when a failure occurs in the mounting part 2, and when a failure occurs at the rear of the accumulation part D such as the mounting part F, the outlet pinch roller 54 is stopped and the output pinch roller 54 is stopped and connected from the sealing part C. The film is stored while lowering the lower roller 111, and when a failure occurs in front of the storage portion D such as the sealing portion C, the central pinch roller 53 is stopped and the lower roller 111 is raised and lowered to store the film. In order to eject the film that was previously being unwound to the cutting section E, and to change the reel rotation mechanism 12 for unwinding the film 1 from one side to the other, it is necessary to eject the film when stopping the film unwinding. In the event of a failure that can be repaired in a short time, there is no need to stop the entire device 2, and the performance as an online system can be doubled.

In FIGS. 1 and 2, the cutting mechanism 4 of the cutting section E is configured to cut a cylindrical film 1' that is intermittently fed a fixed length by an intermittent feeding nip roller 120.
is cut by a cutter 121 that also moves intermittently, and the nip roller 120 is driven by a motor 62.
Power is transmitted from the pinch roller 122 through the differential device 122, and the average value of its feeding speed is set to be approximately the same as the feeding speed of the pinch roller 54.
When the dancer roll 123 moves up and down beyond the set range, the up and down detector 124 detects this and adjusts the speed of the nip roller 120 via the differential device 122. do.

The unit cylindrical film 1'' after being cut to a fixed length is inflated into a substantially circular shape by a suction mechanism 6, fitted into a container 3 conveyed by a conveyance mechanism 8, and passed through a hot air shrink mechanism 7. By this, container 3
It will be packaged in

The cylindrical sealing device of the present invention includes a sealing mechanism 77, a film edge detection mechanism 68 and a meandering correction mechanism 59 in front of the sealing mechanism 77, and is supported by a device frame 51, and includes a film supply section A and an accumulation section D.
In the above embodiment, an on-line method was used in which the process from unwinding the strip film 1 from the multi-layered film reel 11 to cutting it into unit cylindrical films 1'' is carried out continuously. , this cylindrical sealing device can also be used as is in an offline system.

15 and 16 show a second embodiment, in which the film control section B and seal section C are the same as in the previous embodiment, each member is given the same reference numeral, and the film is placed before and after it. A supply section A' and a winding section G for the cylindrical film 1' are arranged.

The film supply section A' has a film reel 11 mounted on a horizontal horizontal shaft 127 rotatably supported by a frame 126.
This horizontal transverse shaft 127 rotates freely, and a powder brake 128 is provided to prevent it from rotating freely. The film strip 1 is unwound from the film reel 11 by an inlet pinch roller 52 and fed to the film control section B.

In the winding section G, a winding shaft 130 supported horizontally on a frame 129 is driven by a motor 131 such as a torque motor. The film 1' is wound onto a take-up reel 132 at a substantially constant speed.

A winding tension detector 133 detects the tension of the cylindrical film during winding and controls the motor 131 to wind the film at a substantially constant tension. 13
Reference numerals 4, 135 and 136 indicate guide rollers of cylindrical film.

According to the present invention described in detail above, the seal mechanism 77
A film edge detection mechanism 68 and a meandering correction mechanism 59 are provided in front of the sealing position, and the lateral position of the film strip 1 can be adjusted while detecting the positional deviation of the edge portion 1a of the film strip 1 before sealing. It becomes possible to always seal at an accurate position. As a result, even if the film is easily affected by tension, temperature, etc. and has poor thermal conductivity, such as a foamed film, there are fewer sealing errors and the seal portion S can be beautifully formed at a predetermined position. I can do it. In addition, the meandering correction mechanism 59
A movable base 64 is mounted on a fixed base 63 so as to be slidable laterally, and a plurality of rolling rollers 65 are provided on the movable base 64 to guide the feeding of the strip film 1. On the other hand, the film both ears 1a
The structure includes a position regulating member 66 that sets the lateral position of the film and a tension adding member 67 that applies tension to the film strip 1 in the feeding direction. While ensuring smooth feeding, the position can be adjusted by moving not only the ear portion 1a but also the entire width in the lateral direction, allowing reliable and accurate meandering correction. Moreover, this meandering correction can also be applied to a sealing device in which the front side of one ear portion 1a overlaps the back side of the other ear portion 1a to form a cylindrical shape.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall front view, FIG. 2 is an overall plan view, FIG. 3 is a partially sectional front view of the reel rotation mechanism, and FIG. - Line sectional view, Figure 5 is a perspective view of the clamper, Figure 6 is a perspective explanatory diagram of the drive shaft connection structure, Figure 7 is a plan view of the supply amount adjustment mechanism, and Figure 8 is also a diagram of the supply amount adjustment mechanism. 9 is a front view of the edge detection mechanism, FIG. 10 is a sectional view taken along the line - - in FIG. 9, FIGS. 11 to 13 are a seal portion, and FIG. 12 is a cross-sectional side view, FIG. 13 is a cross-sectional explanatory view at the - line position in FIG. 11, FIG. 14 is a view taken in the direction of the arrow in FIG. 13, and FIGS. An example is shown, and the first
FIG. 5 is an overall front view, and FIG. 16 is an overall plan view. A...Film supply section, B...Film control section, C...Seal section, D...Accumulation section, S...
... Seal portion, 1 ... Band-shaped film, 1' ... Cylindrical film, 1a ... Ear portion, 2 ... Cylindrical exterior material forming machine, 58 ... Sag detection mechanism, 59 ... Meandering correction mechanism, 68 ... ...Film edge detection mechanism, 77...
... Ultrasonic sealing mechanism, 78 ... Film bending member (front), 84 ... Seal roller, 88 ... Surface roller.

Claims (1)

[Scope of Claims] 1. A cylindrical sealing device having a sealing mechanism 77 that rolls up the strip-shaped film 1 supplied from the raw reel 11 into a cylindrical shape while overlapping and welding both edge portions 1a. A film selvage detection mechanism 68 for detecting a positional shift of the selvage portion 1a of the strip film 1 in front of the sealing position; a movable table 64 on the fixed table 63;
A plurality of rolling rollers 65 are provided on the moving table 64 to guide the feeding of the film strip 1, and a plurality of rolling rollers 65 are provided on the moving table 64 so as to be slidable in the horizontal direction. A position regulating member 66 for setting the position of the belt-shaped film 1 and a tension adding member 67 for applying tension in the feeding direction to the film strip 1 are provided, and the movable stage 64 is slid by a detection signal from the film edge detection mechanism 68. A cylindrical sealing device characterized in that it is equipped with a meandering correction mechanism 59 for adjusting the lateral position of the film strip 1 in front of the film edge detection mechanism 68.