JP7121987B2 - Film correction device and packaging device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a film correcting device for correcting lateral misalignment of a conveyed tubular film, and a packaging apparatus equipped with the film correcting device.

A pillow packaging machine uses a bag-making machine to roll a belt-shaped film into a cylinder, wraps an object in the cylinder-shaped film, and then seals the superimposed vertical seam of the cylinder-shaped film by a center seal device. It is a device that seals and then seals the portion between the items to be packaged in the subsequent film with an end sealing device. Examples of pillow packaging apparatuses are disclosed in Patent Documents 1 to 3, for example.

Patent Literature 1 discloses a vertical pillow packaging device having a function of adjusting meandering of a film.
Patent Literatures 2 and 3 disclose a horizontal pillow packaging apparatus provided with a holding device for holding down a film rolled into a cylindrical shape by a bag making machine. By holding down the tubular film from above by the holding device, the tubular film and the packaged items inside it are prevented from being lifted.

JP 2009-280259 A Japanese Patent No. 5898845 Japanese Patent No. 5189821

By the way, in the process of transporting the cylindrical film from the center sealing device to the end sealing device, the longitudinal binding is folded leftward or rightward. At that time, if the film has high flexibility, the center-sealed cylindrical film may meander and twist. As a result, the center of the pattern printed on the film is shifted, and the appearance of the finished package is not good.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to eliminate the meandering of a tubular film when it occurs.

In order to solve the above problems, a belt conveyor conveys a plurality of items to be packaged inside a cylindrical film at intervals in the longitudinal direction of the film and the film forward along the longitudinal direction. A film correcting device for correcting lateral meandering of the upper film includes a holding belt that travels forward while holding down the film from above, and a swing driving section that swings the holding belt left and right.

In order to solve the above problems, a plurality of objects to be packaged arranged inside a cylindrical film at intervals in the longitudinal direction of the film and the film are conveyed forward along the longitudinal direction. A film correcting device for correcting lateral meandering of the film on the belt conveyor is provided so as to be aligned with the conveying surface at a location where the conveying surface of the belt of the belt conveyor is divided into front and rear, and feeds the film forward. A feed roller, an upper restraining portion provided above the belt conveyor for holding the film from above, and a swing drive portion for swinging the feed roller left and right.

According to the above, when the cylindrical film is meandering to the left, the film shifts to the right when the swing driving section swings the holding belt or the feed roller to the right, so that the left meandering of the film is eliminated. be done. If the cylindrical film meanders to the right, the film shifts to the left when the swing driving section swings the holding belt or the feed roller to the right, so that the right meandering of the film is eliminated.

According to the present invention, when the tubular film is meandering from side to side, the meandering can be eliminated.

It is a schematic side view of a pillow packaging machine. It is a schematic top view of the principal part of a pillow packaging apparatus. It is a block diagram of a pillow packaging device. It is drawing which showed the cylindrical film after center sealing. FIG. 10 is a drawing showing a tubular film in which the vertical seams are folded; 1 is a top view of a package made by a pillow packaging machine; FIG. 1 is a top view of a package made by a pillow packaging machine; FIG. 1 is a top view of a package made by a pillow packaging machine; FIG. It is a schematic side view of the pillow packaging apparatus of 2nd Embodiment. FIG. 10 is an enlarged view of an X portion shown in FIG. 9;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, since the embodiments described below are technically preferable and have various limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

[First Embodiment]
FIG. 1 is a schematic side view of the pillow packaging machine 1. FIG. FIG. 2 is a schematic top view of the main part of the pillow packaging machine 1. FIG. FIG. 3 is a block diagram of the pillow packaging device 1. As shown in FIG.

This pillow packaging device 1 is a device that sequentially prepares packages 2 by sequentially wrapping items 3 to be packaged with a film 4 . In this pillow packaging machine 1, the article to be packaged 3 and the package 2 are conveyed from the rear to the front. Therefore, the upstream side of the flow of the conveyed items 3 and packages 2 is the rear side, and the downstream side is the front side.

The pillow packaging device 1 includes a conveying table 28, a receiving plate (upper plate) 68, a film feeder 10, a bag-making device (former) 18, a packaged object feeder 20, a belt conveyor 30, a discharge belt conveyor 35, and a gusset forming machine. 40, a center sealing device 60, an end sealing device 70, an upper holding portion 80, an inspection camera (imaging means) 95, a control portion 90, and the like. Here, the pillow packaging apparatus 1 is equipped with a left and right shift film correction device for the cylindrical film 4 on the belt conveyor 30 . The film corrector has an upper hold down section 80 , an inspection camera 95 and a control section 90 . The control unit 90 serves both as the control unit of the pillow packaging device 1 and the control unit of the film correction device.

The control unit 90 is a control circuit having a motor driver, a computer, and the like.

The upper surface of the carriage 28 is provided horizontally, and a slit is formed in the carriage 28 . A pair of left and right horizontal receiving plates 68 are provided in front of the carriage 28 . A slit (gap) is formed between the pair of receiving plates 68 . The receiving plate 68 is provided so as to be level with the upper surface of the carriage 28 . A bag making device 18 is provided between the carrier 28 and the receiving plate 68 .

Behind the bag making machine 18, a packaged material supply machine 20 is provided. The to-be-packaged item supply machine 20 supplies the to-be-packaged items 3 on the carrier table 28 to the bag making machine 18 at predetermined intervals. The to-be-packaged item feeder 20 is a push conveyor and includes a first sprocket 21 , a second sprocket (not shown), an endless chain 22 , a plurality of push members 23 and a motor 24 . The first sprocket 21 is arranged below the carrier 28 and the bag making machine 18 . The second sprocket is arranged behind the first sprocket 21 and below the carriage 28 . The endless chain 22 is stretched over the first sprocket 21 and the second sprocket. The pushing members 23 are attached to the endless chain 22 at predetermined intervals.

When the first sprocket 21 is rotationally driven by the motor 24, the endless chain 22 runs. As the endless chain 22 runs, the pushing member 23 moves from the second sprocket toward the first sprocket 21 while passing through the slit of the carrier 28 and protruding above the carrier 28 . Therefore, the article to be packaged 3 on the carrier table 28 is pushed forward by the pushing member 23 from behind. The control unit 90 controls the motor 24 to control the supply speed of the packaged item supply machine 20 .

A film feeder 10 is provided above the bag making machine 18 . The film feeder 10 includes an original roll 11, a feed roller 12, a feed motor 13, and the like. A strip-shaped film 4 is wound around the raw fabric roll 11 . The film 4 is printed with characters, symbols, colors, patterns, figures, pictures, or a combination thereof. The raw fabric roll 11 is set above the bag making machine 18 . The feed roller 12 is horizontally provided obliquely above the bag making machine 18 . The film 4 unwound from the original roll 11 is guided to the bag making machine 18 via the feed rollers 12 .

When the feed motor 13 rotates the feed roller 12 , the film 4 is pulled out from the original roll 11 . Thereby, the film feeder 10 continuously feeds the film 4 to the bag making machine 18 . The feed speed of the film feeder 10 is controlled by the control unit 90 controlling the feed motor 13 . The film 4 may be fed out from the original roll 11 by driving the original roll 11 by the feed motor 13 .

When the film 4 supplied by the film feeder 10 passes forward through the bag making machine 18 , both sides 5 of the film 4 (hereinafter referred to as vertical seams 5 ) are bent downward by the bag making machine 18 . , the film 4 is rolled into a cylinder by a bag making machine 18 so that the printed surface faces the front side. The object to be packaged 3 supplied to the bag making machine 18 is wrapped in the film 4 by rolling the film 4 into a cylindrical shape. The vertical seams 5 are overlapped by the bag-making machine 18 and formed in a fin-like shape so as to hang down.

On the downstream side of the bag making machine 18, a plurality of items to be packaged 3 supplied by the item to be packaged supply machine 20 are placed inside the tubular film 4 at predetermined intervals in the longitudinal direction (front-rear direction) of the tubular film 4. are arranged as follows. Then, the items to be packaged 3 are transported downstream along the tubular film 4 on the receiving plate 68 and the belt conveyor 30, which will be described later, while maintaining their arrangement.

A center sealing device 60 is provided in front of the bag making machine 18 and below the receiving plate 68 . The center sealing device 60 seals the vertical binding 5 protruding downward from the slit of the receiving plate 68 by heating it while sandwiching it from both left and right sides. In this illustrated example, the center seal device 60 has a pair of left and right rod-shaped heaters 61 provided below the receiving plate 68 and a pair of left and right press rollers 62 provided in front of the rod-shaped heaters 61 . The vertical binding 5 is heated by passing through the gap between the pair of rod-shaped heaters 61 . The heated vertical binding 5 is sandwiched by the press rollers 62 with a predetermined pressure, thereby sealing the vertical binding 5 . A pair of left and right pinch rollers 63 for sandwiching the vertical binding 5 are provided in front and rear of the bar-shaped heater 61, and a pair of left and right pinch rollers 64 for sandwiching the vertical binding 5 are provided downstream of the press roller 62. , the longitudinal stitch 5 is sent downstream by the pinch rollers 63,64.

A belt conveyor 30 is provided in front of the center seal device 60 . A discharge belt conveyor 35 is provided in front of the belt conveyor 30 . The conveying surface of the endless belt of the belt conveyor 30 extends horizontally forward from the front end of the receiving plate 68 . The conveying surface of the endless belt of the discharge belt conveyor 35 is separated forward from the front end of the conveying surface of the endless belt of the belt conveyor 30 and extends forward in the horizontal direction. The conveying speeds of the belt conveyor 30 and the discharge belt conveyor 35 are controlled by the control unit 90 controlling the motors of the belt conveyor 30 and the discharge belt conveyor 35 . The belt conveyor 30 and the discharge belt conveyor 35 may use separate motors as power sources, or may use a common motor as a power source.

The cylindrical film 4 sealed by the center sealing device 60 and the package 3 inside it are fed from the receiving plate 68 onto the endless belt of the belt conveyor 30 . Then, the tubular film 4 on the belt conveyor 30 and the article to be packaged 3 inside thereof are conveyed forward by the belt conveyor 30 .

The vertical seam 5 sealed by the center sealing device 60 is folded to the left or right so as to come in contact with the lower surface of the tubular film 4 when sent from the pinch roller 64 onto the endless belt of the belt conveyor 30 . When the vertical binding 5 is folded, the tubular film 4 may meander. If the tubular film 4 meanders to the left or right, the tubular film 4 twists and rotates in the circumferential direction. Here, FIG. 4 is a cross-sectional view of the tubular film 4 seen forward before the vertical binding 5 is folded, and FIG. 5 is a frontward sectional view of the tubular film 4 after the vertical binding 5 is folded. Fig. 3 is a cross-sectional view; In FIG. 5, the twisted state of the tubular film 4 is indicated by a solid line, and the twisted state of the tubular film 4 is indicated by a chain double-dashed line.

When such meandering of the tubular film 4 occurs, the meandering of the tubular film 4 is eliminated by the upper restraining portion 80 and the swing drive portion 89 . The upper holding portion 80 and the swing driving portion 89 will be described in detail below.

As shown in FIGS. 1 and 2, the upper holding portion 80 is provided above the belt conveyor 30 immediately behind the end seal device 70 . The upper restraining part 80 restrains the object to be packaged 3 and the tubular film 4 on the belt conveyor 30 from above to prevent the object to be packaged 3 and the tubular film 4 from being lifted.

The upper pressing portion 80 includes a body 81 , a tail roller 82 , a drive roller 83 , a pressing belt 84 and a drive motor 85 . A body 81 is provided above the belt conveyor 30 . A tail roller 82 is rotatably attached to the rear portion of the body 81, a drive roller 83 is rotatably provided to the front portion of the body 81, and an endless pressing belt 84 is stretched between the tail roller 82 and the drive roller 83. there is The lower surface of this holding belt 84 holds down the article 3 to be packaged from above the tubular film 4 .

When the drive roller 83 is driven to rotate by the drive motor, the lower surface of the holding belt 84 travels forward together with the tubular film 4 . By controlling the drive motor 85 by the controller 90 , the speed of the hold-down belt 84 becomes equal to the transport speed of the tubular film 4 and the package 3 by the belt conveyor 30 .

The restraining belt 84 is provided so as to be yawingable. In other words, the hold-down belt 84 is provided so as to swing left and right around a vertical axis 86 . Specifically, the body 81 of the upper restraining portion 80 is connected to the swing driving portion 89 so as to be rotatable about the axis 86, so that the restraining belt 84 is provided so as to swing left and right. The swing driving section 89 has a motor, a transmission mechanism, etc., and drives the body 81 of the upper holding section 80 so as to swing the holding belt 84 around the axis 86 . The swinging range of the holding belt 84 by the swing drive unit 89 is, for example, from 5° to the right to 5° to the left.

When the oscillating angle of the holding belt 84 is zero degrees, the drive roller 83 and the tail roller 82 are perpendicular to the conveying direction of the belt conveyor 30 when viewed from above, and the running direction of the lower surface of the holding belt 84 is the direction of the belt conveyor. 30 parallel to the transport direction. The upper holding portion 80 in this state is indicated by a solid line in FIG.

When the holding belt 84 swings to the right, the running direction of the lower surface of the holding belt 84 is inclined to the right from the conveying direction of the belt conveyor 30 . The upper restraining portion 80 in this state is indicated by a chain double-dashed line 80A in FIG. As the holding belt 84 rocks to the right, the tubular film 4 shifts to the right. Therefore, when the tubular film 4 meanders to the left behind the upper holding portion 80, the left meandering is eliminated by the holding belt 84, and the twisting of the tubular film 4 is also eliminated.

When the holding belt 84 swings to the left, the running direction of the lower surface of the holding belt 84 is inclined to the left from the conveying direction of the belt conveyor 30 . The upper restraining portion 80 in this state is indicated by a chain double-dashed line 80B in FIG. By swinging the holding belt 84 to the left, the tubular film 4 is shifted to the left. Therefore, when the tubular film 4 meanders to the right behind the upper holding portion 80, the right meandering is eliminated by the holding belt 84, and the twisting of the tubular film 4 is also eliminated.

The control unit 90 controls the swing drive unit 89 to control the swing angle of the holding belt 84 by the swing drive unit 89 . The control will be detailed later.

The tubular film 4 and the article to be packaged 3 conveyed to the front end of the belt conveyor 30 are transferred from the belt conveyor 30 to the discharge belt conveyor 35 .

Gusset forming machines 40 are provided on the left and right sides of the front portion of the belt conveyor 30 and the rear portion of the carry-out belt conveyor 35 . The gusset forming machine 40 forms gussets on the left and right side surfaces of the tubular film 4 by periodically folding the left and right side surfaces of the tubular film 4 inward. The timing at which the gusset forming machine 40 forms gussets on the tubular film 4 is the period from when the article to be packaged 3 passes through the gusset forming machine 40 to when the next article to be packaged 3 passes the gusset forming machine 40. . That is, gussets are formed by the gusset forming machine 40 at the portions of the film 4 between the adjacent items 3 to be packaged when the portions are transferred from the belt conveyor 30 to the output belt conveyor 35 . Note that the gusset forming machine 40 may not be provided.

An end seal device 70 is provided between the belt conveyor 30 and the discharge belt conveyor 35 . This end sealing device 70 periodically seals and cuts the tubular film 4 . The timing at which the end sealing device 70 seals and cuts the film 4 is from the passage of the packaged item 3 through the end sealing device 70 to the passage of the next packaged item 3 through the end sealing device 70 . That is, when the portion of the film 4 between the adjacent items 3 to be packaged is transferred from the belt conveyor 30 to the output belt conveyor 35, the portion is sealed and cut by the end sealing device 70. FIG.

The end seal device 70 has an upper sealer 71 , a lower sealer 72 and a drive mechanism 73 . Each of the upper sealer 71 and the lower sealer 72 incorporates a heater. The upper sealer 71 is provided on the upper side between the belt conveyor 30 and the output belt conveyor 35 so as to move up and down along a predetermined track, and the lower sealer 72 is provided on the lower side between the belt conveyor 30 and the output belt conveyor 35 on a predetermined track. It is provided so that it can be raised and lowered along. The tubular film 4 and the items 3 to be packaged therein pass between the sealers 71 and 72 .

The drive mechanism 73 has a motor or the like, and uses the power of the motor to move the upper sealer 71 and the lower sealer 72 toward and away from each other in the vertical direction. The drive mechanism 73 may be a box motion drive mechanism or a rotary drive mechanism. The control unit 90 performs synchronous control of the motor of the drive mechanism 73, the motors of the belt conveyor 30 and the unloading belt conveyor 35, the motor 24 of the packaged item feeder 20, and the feed motor 13 of the film feeder 10. , the timing of sealing and cutting of the film 4 by the end sealing device 70 is synchronized with the passage timing of the end sealing device 70 at the portion between the adjacent packaged items 3 .

In the case of the box-motion type, the drive mechanism 73 lowers the upper sealer 71 and raises the lower sealer 72 to sandwich the tubular film 4 between the sealers 71 and 72, thereby moving the sealers 71 and 72 to the tubular film. Moves a predetermined distance forward at the same speed as 4. After that, the drive mechanism 73 moves the upper sealer 71 and the lower sealer 72 backward by a predetermined distance, raises the upper sealer 71 and then lowers it, and lowers the lower sealer 72 in synchronization with the elevation of the upper sealer 71. raise. By synchronizing the lowering timing of the upper sealer 71 with the raising timing of the lower sealer 72, the sealers 71 and 72 are brought close to each other, and the film 4 is sandwiched between the sealers 71 and 72 and sealed. The sealers 71 and 72 are separated from the sealed film 4 by synchronizing the rising timing of the upper sealer 71 and the falling timing of the lower sealer 72 . The driving mechanism 73 causes the sealers 71 and 72 to repeatedly perform such operations, thereby repeatedly sealing the film 4 .

In the case of a rotary type, the drive mechanism 73 rotates the upper sealer 71 around the upper rotating shaft extending left and right, and rotates the lower sealer 72 around the lower rotating shaft extending left and right. The film 4 is sandwiched between the upper sealer 71 and the lower sealer 72 and sealed by synchronizing the timing when the upper sealer 71 passes the lowest point of the circular orbit and the timing when the lower sealer 72 passes the highest point of the circular orbit. be done. In addition, in the case of a rotary type, a roller conveyor may be provided instead of the belt conveyor 30 .

In the case of the box motion type, the upper sealer 71 has a built-in blade. A drive mechanism 73 or another power source advances the blade from the upper sealer 71 into the lower sealer 72 when the film 4 is sandwiched between the sealers 71 , 72 . Then, the portions sealed by the sealers 71 and 72 are cut by the blade. It should be noted that the blade may be incorporated in the lower sealer 72 and protrude from the lower sealer 72 to the upper sealer 71 .
In the rotary type, a blade is provided on one of the sealers 71, 72 and a receiving blade is provided on the other. Then, when the film 4 is sandwiched between the sealers 71 and 72, the portions thermally compressed by the sealers 71 and 72 are cut by the blade and the receiving blade.

In the box motion type, the front end portion of the belt conveyor 30 and the rear end portion of the unloading belt conveyor 35 reciprocate back and forth in synchronization with the back and forth movement of the sealers 71 and 72 . The front end portion of the belt conveyor 30 refers to the folded portion of the endless belt of the belt conveyor 30 . The rear end of the carry-out belt conveyor 35 is also the same.

After the tubular film 4 is sealed by the end sealing device 70 and then cut, the finished package 2 is separated from the tubular film 4 . The separated packages 2 are conveyed forward by the discharge belt conveyor 35 .

Here, when the cylindrical film 4 is sealed and cut by the end sealing device 70 without meandering left and right on the upstream side of the end sealing device 70, a normal package 2 as shown in FIG. 6 is completed. The printed content on the surface of the film 4 of the package 2 is in a normal position.
Also, if the tubular film 4 is twisted by meandering to the right and sealed and cut, a defective package 2 as shown in FIG. 7 is completed. The printed content on the surface of the film 4 of this package 2 is shifted to the right.
Also, if the tubular film 4 is twisted by left meandering and sealed and cut, a defective package 2 as shown in FIG. 8 is completed. The printed content on the surface of the film 4 of this package 2 is shifted to the left.

An inspection camera 95 captures an image of the package 2 conveyed by the output belt conveyor 35 in order to observe the left and right displacement of the film 4 of the completed package 2 . As shown in FIGS. 1 and 2, this inspection camera 95 is provided above the carry-out belt conveyor 35 just in front of the end sealing device 70 . Also, the inspection camera 95 is provided facing downward and images the package 2 from above. The imaging timing of the inspection camera 95 is when the package 2 passes forward under the inspection camera 95 . Based on the image of the package 2 imaged by the inspection camera 95 , the image is transferred from the inspection camera 95 to the control unit 90 in order to detect the lateral shift amount of the film 4 of the package 2 . An image output from the inspection camera 95 and input to the control unit 90 is hereinafter referred to as an input image.

The control unit 90 preliminarily performs feature extraction processing on a plurality of sample images showing the packages 2, and machine-learns the feature amounts of those sample images by deep learning using a neural network. The plurality of sample images machine-learned in advance by the control unit 90 include a sample image of a normal package 2 in which the film 4 is not displaced to the left and right, and a sample image of a package 2 in which the film 4 is displaced to the left (film 4 ) and a sample image of the package 2 in which the film 4 has shifted to the right (there are images with various right shift amounts of the film 4). there is The control unit 90 associates each sample image with a left-right shift amount and stores it in advance.

Each time an input image is transferred from the inspection camera 95 to the control unit 90, that is, each time the inspection camera 95 captures an image of the completed package 2, the control unit 90 performs the following processing.

First, the control unit 90 determines a sample image that is most similar to the input image by comparing the input image and a plurality of sample images. In other words, the control unit 90 performs feature extraction processing on the input image, and then obtains the degree of approximation (likelihood) for each sample image based on the feature amount of the input image and the feature amounts of a plurality of sample images, and obtains the closest approximation. Determine a high degree sample image. Then, the control unit 90 obtains the amount of left-right shift corresponding to the determined sample image.

Next, the control unit 90 controls the swing drive unit 89 so that the swing angle is proportional to the calculated deviation amount. Then, the pressing belt 84 of the upper pressing portion 80 is swung by the swing drive portion 89 to the swing angle. Here, if the calculated amount of deviation is zero, the swing angle is 0°. swing angle increases.

Therefore, if the tubular film 4 meanders to the left or right before the holding belt 84 swings, the meandering is corrected by the holding belt 84 and eliminated. Therefore, after the pressing belt 84 is oscillated, the film 4 of the finished package 2 is not displaced to the left and right, and the vertical binding and printed content are in appropriate positions, so that the finished package 2 looks good. After the holding belt 84 swings, if the package 2 passes under the inspection camera 95 without the film 4 being displaced laterally, the holding belt 84 returns to the swing angle of 0° by the control described above.

[Second Embodiment]
FIG. 9 is a perspective view of the pillow packaging device 1A of the second embodiment. 10 is an enlarged view of the X portion shown in FIG. 9. FIG.

Each component of the pillow packaging machine 1A of the second embodiment is given the same reference numeral as that of the corresponding component of the pillow packaging machine 1 of the first embodiment. Moreover, below, it demonstrates mainly about the difference between 1 A of pillow packaging apparatuses of 2nd Embodiment, and the pillow packaging apparatus 1 of 1st Embodiment.

In the pillow packaging device 1 of the first embodiment, the holding belt 84 of the upper holding portion 80 swings left and right. On the other hand, in the pillow packaging device 1A of the second embodiment, the pressing belt 84 of the upper pressing portion 80 does not swing left and right.

Further, in the pillow packaging device 1A of the second embodiment, the conveying surface of the endless belt of the belt conveyor 30 is divided into front and rear by rollers 30a to 30d. Specifically, the endless belt of the belt conveyor 30 is folded back downward by the roller 30a between the front end folded portion and the rear end folded portion, further folded forward by the roller 30b, further folded back upward by the roller 30c, and further folded back by the roller 30b. It is folded forward by the roller 30d.

Further, in the pillow packaging device 1A of the second embodiment, the lower support portion 50 and the swing driving portion 59 are provided in the area surrounded by the rollers 30a to 30d. The lower support portion 50 has a body 51 , a plurality of feed rollers 52 rotatably attached to the body 51 and parallel to each other, and a motor 53 for rotating the feed rollers 52 . The axis of the feed roller 52 extends left and right, and the top of the outer peripheral surface of the feed roller 52 is level with the conveying surface of the endless belt of the belt conveyor 30 .

The tubular film 4 conveyed by the belt conveyor 30 and the article to be packaged 3 inside thereof are supported from below by the feed rollers 52 . Here, since the feed roller 52 is rotationally driven by the motor 53, not only the belt conveyor 30 but also the feed roller 52 feeds the article 3 and the tubular film 4 forward. The peripheral speed of the outer peripheral surface of the feed roller 52 and the conveying speed of the belt conveyor 30 are equal.

The body 51 of the lower support portion 50 is connected to a swing drive portion 59 so as to be rotatable about a vertical axis 56, so that the feed roller 52 is provided so as to swing left and right. The swing driving section 59 has a motor, a transmission mechanism, and the like, and drives the body 51 of the lower support section 50 so as to swing the feed roller 52 around the axis 56 . The swinging range of the feed roller 52 by the swing drive unit 59 is, for example, from 5° to the right to 5° to the left. When the swing angle of the feed roller 52 is zero degrees, the feed roller 52 is perpendicular to the conveying direction of the belt conveyor 30 when viewed from above.

Also, as in the first embodiment, each time an input image is transferred from the inspection camera 95 to the control unit 90, the control unit 90 obtains the amount of displacement, and the swing angle is adjusted to be proportional to the obtained amount of displacement. , the rocking drive unit 59 is controlled. Then, the feed roller 52 of the lower support portion 50 is oscillated by the oscillating driving portion 59 to the oscillating angle. That is, when the cylindrical film 4 meanders to the right, the feed roller 52 swings to the left, and when the cylindrical film 4 meanders to the left, the feed roller 52 swings to the right. do. Here, if the calculated amount of deviation is zero, the swing angle is 0°. swing angle increases.

Therefore, if the tubular film 4 meanders to the left or right before the feed roller 52 swings, the meander is corrected by the feed roller 52 and eliminated.

1, 1A... Pillow packaging machine (packaging machine)
DESCRIPTION OF SYMBOLS 10... Film supply machine 18... Bag making machine 20... Packaged material supply machine 30... Belt conveyor 50... Lower side support part 52... Feed roller 59... Swing drive part 60... Center seal device 70... End seal device 80... Upper side Retaining unit 84 Retaining belt 89 Swing driving unit 90 Control unit 95 Inspection camera (imaging means)

Claims (8)

A plurality of items to be packaged are arranged inside a cylindrical film at intervals in the longitudinal direction of the film, and lateral meandering of the film on a conveyor that conveys the film forward along the longitudinal direction is corrected. A film correction device for
a holding belt that travels forward while holding down the film from above;
a swing driving unit for swinging the holding belt to the left and right;
a film corrector. When the film meanders to the right, the swing driving section swings the holding belt to the left, and when the film meanders to the left, the swing driving section swings the holding belt to the right. 2. The film correction device of claim 1, wherein an imaging means for outputting an image of the film by imaging the film in front of the holding belt;
A control for obtaining a lateral shift amount of the film based on the image output by the imaging means, and controlling the swing driving section so as to swing the holding belt at a swing angle corresponding to the obtained shift amount. Department and
3. The film correction device according to claim 1 or 2, comprising: a bag making machine that continuously rolls the film into a cylindrical shape by bending both sides of the strip-shaped film conveyed in the longitudinal direction;
a packaged object feeder provided at the rear of the bag making machine for supplying a plurality of packaged objects at intervals to the inside of the film rolled by the bag making machine;
a center seal device provided in front of the bag making machine for continuously sealing both sides of the tubular film rolled by the bag making machine;
a conveyor provided in front of the center sealing device for conveying the plurality of items to be packaged and the tubular film forward along the longitudinal direction;
a holding belt that is provided above the conveyor and travels forward while holding down the tubular film from above;
a swing driving unit for swinging the holding belt to the left and right;
an end seal device provided in front of the conveyor and the holding belt for sealing a portion of the tubular film between the articles to be packaged;
A packaging device comprising: A plurality of items to be packaged are arranged inside a cylindrical film at intervals in the longitudinal direction of the film, and the meandering of the film to the left and right on a belt conveyor that conveys the film forward along the longitudinal direction. A film correction device for correcting,
a feed roller provided so as to be aligned with the conveying surface at a location where the conveying surface of the belt of the belt conveyor is divided into front and rear, and feeds the film forward;
an upper restraining portion provided above the belt conveyor and restraining the film from above;
a swing drive unit for swinging the feed roller left and right;
a film corrector. When the film meanders to the right, the swing drive section swings the feed roller to the left, and when the film meanders to the left, the swing drive section swings the feed roller to the right. 6. The film corrector of claim 5, wherein an imaging means for outputting an image of the film by imaging the film in front of the belt conveyor;
A left or right shift amount of the film is obtained based on the image output by the imaging means, and the swing driving section is controlled to swing the feed roller at a swing angle corresponding to the obtained shift amount. a control unit that
7. The film correction device according to claim 5 or 6, comprising: a bag making machine that continuously rolls the film into a cylindrical shape by bending both sides of the strip-shaped film conveyed in the longitudinal direction;
a packaged object feeder provided at the rear of the bag making machine for supplying a plurality of packaged objects at intervals to the inside of the cylindrical film rolled by the bag making machine;
a center seal device provided in front of the bag making machine for continuously sealing both sides of the tubular film rolled by the bag making machine;
a belt conveyor provided in front of the center seal device for conveying the plurality of items to be packaged and the tubular film forward along the longitudinal direction;
a feed roller provided so as to be aligned with the conveying surface at a location where the conveying surface of the belt of the belt conveyor is divided into front and rear, and feeds the tubular film forward;
a swing drive unit for swinging the feed roller left and right;
an end seal device provided in front of the belt conveyor for sealing a portion of the tubular film between the articles to be packaged;
A packaging device comprising:

Images