JP7516880B2 - Bag making device and method for manufacturing bag-shaped packaging container - Google Patents

Description

The present invention relates to a bag making device and a method for manufacturing bag-shaped packaging containers that manufacture bag-shaped packaging containers by unwinding and overlapping a long film, feeding it intermittently, and heat-sealing it, and in particular to a bag making device and a method for manufacturing bag-shaped packaging containers that can feed the film intermittently with high precision to prevent misalignment of the sealing position and cutting position.

Conventionally, there is known a bag-shaped packaging container in which the periphery of a flexible film is heat-sealed. Such bag-shaped packaging containers are generally manufactured by unwinding and overlapping a long piece of film, and then heat-sealing the film while feeding it intermittently. To improve the yield, however, it is required to feed the film intermittently with precision and prevent misalignment of the sealing and cutting positions.

For example, in Patent Document 1, a bag making device is provided with, in order from the upstream side in the film feed direction, a film feed roll (2), a vertical sealing device (5), a film feed roll (8), a horizontal sealing device (10), a feed amount adjustment roll (16), and a cutting device (17).A marker (3) is provided upstream of the vertical sealing device (5) to apply a detection mark (4) to the film, and a mark detector (13) is provided between the horizontal sealing device (10) and the feed amount adjustment roll (16) (see the drawings of Patent Document 1; the symbols in parentheses are referenced in Patent Document 1).
When the mark detector (13) detects the mark (4) while the film is being intermittently fed by the feed amount adjustment roll (16), the feed amount adjustment roll (16) adjusts the amount of film feed to stop the film.

In addition, in Patent Document 2, in a bag making machine provided with, in order from the upstream side in the film feed direction, a vertical heater (10), intermediate feed rollers (14), horizontal heaters (11), downstream feed rollers (19), and a cutter (20), a marking device (26) that applies a mark (29) to the film is provided upstream of the vertical heater (10), and a sensor (27) that detects the mark (29) is provided between the horizontal heater (11) and the downstream feed roller (19) (see FIG. 1 of Patent Document 2, etc.; the reference numbers in parentheses are those used in Patent Document 2).
The film is then intermittently fed by intermediate feed rollers (14) which are program-controlled to maintain the feed amount at a set value, and when a sensor (27) detects a mark (29), the downstream feed rollers (19) are program-controlled so that the film stops when the proper position of the film coincides with the position of the lateral heater (11).

Utility Model Publication No. 59-19322 Japanese Unexamined Patent Publication No. 6-170989

However, although Patent Document 1 describes adjusting the amount of film feed using a feed adjustment roll (16), it is unclear how this adjustment is performed, and it is difficult to instantly stop a film that is being fed at a constant speed after the mark detector (13) detects the mark (4).
This not only caused variations in the amount of film feed, but also in the spacing between the detection marks (4) on the film. Furthermore, the mark detector (13) is located far downstream of the marker (3), past the vertical sealing device (5) and the horizontal sealing device (10), and it is difficult to adjust the amount of film feed using the feed amount adjustment roll (16) in consideration of the effects of expansion and contraction of the film due to heat sealing. Therefore, the bag making device of Patent Document 1 has room for improvement in terms of accurate intermittent feeding of the film.

In addition, even in Patent Document 2, it is unclear how the intermediate feed roller (14) and downstream feed roller (19) are program-controlled, and the film is stopped after the sensor (27) detects the mark (29), and the sensor (27) is located far downstream of the marking device (26), past the vertical heater (10) and horizontal heater (11), so just like Patent Document 1, there is room for improvement in terms of accurate intermittent film feeding.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a bag making device and a method for manufacturing bag-shaped packaging containers that can produce bag-shaped packaging containers with a high yield by feeding the film intermittently with precision and suppressing misalignment of the sealing position and cutting position when manufacturing bag-shaped packaging containers by unwinding and overlapping a long film, feeding it intermittently, and heat sealing it.

The bag making apparatus of the present invention is a bag making apparatus for producing bag-shaped packaging containers by unwinding a long film, overlapping it, and heat-sealing it while intermittently feeding it, and is configured to have a first heat sealing unit, a second heat sealing unit, and a cutting unit, arranged in that order along the feed direction of the film, and the film is intermittently fed by an intermediate feed roller installed between the first heat sealing unit and the second heat sealing unit, and a downstream feed roller installed between the second heat sealing unit and the cutting unit, a marker unit that applies a mark to the film for each intermittent feed is installed upstream of the first heat sealing unit, and a feedback control unit having a first imaging unit installed between the marker unit and the first heat sealing unit so that an imaging field of view includes a position that is a positive integer multiple of an appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit, and the feedback control unit adjusts the amount of rotation of the intermediate feed roller based on position information of the mark imaged by the first imaging unit, thereby feedback controlling the feed pitch of the film by the intermediate feed roller.

In addition, a manufacturing method for a bag-shaped packaging container according to the present invention is a method for manufacturing a bag-shaped packaging container by overlapping a long film while unwinding it, and intermittently feeding the film through a first heat-sealing unit, a second heat-sealing unit, and a cutting unit in that order by an intermediate feed roller installed between the first heat-sealing unit and the second heat-sealing unit and a downstream feed roller installed between the second heat-sealing unit and the cutting unit, in which a mark is applied to the film at each intermittent feed by a marker unit installed upstream of the first heat-sealing unit , and an error with respect to the appropriate feed pitch is measured based on position information of the mark imaged by a first imaging unit installed between the marker unit and the first heat-sealing unit so that an imaging field includes a position that is a positive integer multiple of the appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit, and the film is intermittently fed while performing feedback control to adjust the amount of rotation of the intermediate feed roller so as to correct the error.

According to the present invention, when manufacturing a bag-shaped packaging container by unwinding and overlapping a long film, feeding it intermittently, and heat sealing it, the film can be fed intermittently with precision, suppressing misalignment of the sealing position and cutting position, and bag-shaped packaging containers can be manufactured with a good yield.

1 is an explanatory diagram showing a schematic overview of a bag making apparatus according to an embodiment of the present invention; FIG. 2 is an explanatory diagram showing an example of a bag-shaped packaging container to be manufactured. 1 is an explanatory diagram showing an example of an XY coordinate system set within the imaging field of view of each of a first imaging unit, a second imaging unit, and a third imaging unit in a bag making apparatus according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing a schematic overview of the bag making apparatus according to the present embodiment, with FIG. 1(a) being a side view and FIG. 1(b) being a plan view of the main part.

The bag making device 1 shown in FIG. 1 is for producing a bag-shaped packaging container 100, for example, as shown in FIG. 2, by unwinding and overlapping a long film F, feeding it intermittently, and heat sealing it.

FIG. 2 shows an example of a flat bag type in which three sides are heat sealed by a bottom seal portion 101 and a side seal portion 102, but it goes without saying that the present invention can also be applied to the production of standing type packaging containers, etc.
In the example shown in FIG. 2, the top of the container is an unsealed portion, and typically, in this type of packaging container 100, the contents are filled from the unsealed portion, and then a top seal is applied to the unsealed portion.

Although not specifically shown, the bag making device 1 is equipped with a film supply unit that supplies a wide film roll unwound from a roll of film while slitting the center of the width along the longitudinal direction, and can be configured to pay out two separated sheets of film F while overlapping them with a guide roll 2. The specific configuration of the film supply unit is not particularly limited, but when manufacturing a standing-type packaging container, it can be configured so that a narrow film that forms the bottom of the container is folded in half and supplied between the two sheets of film F.

The bag making apparatus 1 also includes, in the feeding direction of the film F, a first heat-sealing unit 3, a second heat-sealing unit 5, and a cutting unit 7 in that order.
These are configured to operate for each intermittent feed of the film F, with the first heat-sealing unit 3 heat-sealing the film F in the longitudinal direction to form a bottom seal portion 101, the second heat-sealing unit 5 heat-sealing the film F in a direction perpendicular to the longitudinal direction to form a side seal portion 102, and the cutting unit 7 cutting the film F into a predetermined shape (see FIG. 2), but the specific configuration is not particularly limited. Depending on the dimensions and shape of the packaging container 100 to be manufactured, the conventional devices may be modified as appropriate.

In addition, the bag making apparatus 1 is configured to intermittently feed the film F by controlling the drive of an intermediate feed roller 4 installed between the first heat sealing unit 3 and the second heat sealing unit 5, and a downstream feed roller 6 installed between the second heat sealing unit 5 and the cutting unit 7.
It is preferable to use a so-called roll guider, in which a pair of rolls are supported so as to be rotatable about an arbitrary fulcrum, for the intermediate feed roller 4 and the downstream feed roller 6. In this way, the intermediate feed roller 4 and the downstream feed roller 6 can be respectively installed so as to be rotatable in the feed direction and counter-feed direction of the film F, so that the meandering of the film F during its travel can be corrected.

The bag making apparatus 1 also includes a marker section 8 upstream of the first heat sealing unit 3 that applies a mark to the film F at each intermittent feed.
There are no particular limitations on the specific configuration of marker unit 8, so long as it can place mark M on film F when intermittent feeding stops. It is preferable to use a laser marker, as it can place mark M on film F without contact, has high response, and is maintenance-free.
The mark M on the film F may be, for example, in the form of a dot as shown in FIG. 1(b), but there is no particular limitation on the size or shape of the mark M as long as it is identifiable.

The bag making apparatus 1 also includes a feedback control unit 9 that feedback controls the operation of the bag making apparatus 1 .
In the illustrated example, the feedback control unit 9 has a first imaging unit 10, a second imaging unit 11, and a third imaging unit 12, and the first imaging unit 10 is installed between the marker unit 8 and the first heat seal unit 3, the second imaging unit 11 is installed between the intermediate feed roller 4 and the second heat seal unit 5, and the third imaging unit 12 is installed between the second heat seal unit 5 and the downstream feed roller 6. The feedback control unit 9 is configured to capture an image of the mark M affixed to the film F at each installed position, analyze the image data using an image analysis program stored in the feedback control unit 9, derive positional information of the mark M when the intermittent feed is stopped, and feedback control the operation of the bag making apparatus 1 based on the positional information.

The first imaging unit 10, the second imaging unit 11, and the third imaging unit 12 are preferably installed so that the imaging field of view includes a position that is separated from the marking position of the mark M by the marker unit 8 along the feed direction of the film F by a distance of a positive integer multiple of an appropriate feed pitch P according to the dimensions and shape of the packaging container 100 to be manufactured (in the illustrated example, the first imaging unit 10 is 1 pitch (P x 1), the second imaging unit 11 is 8 pitches (P x 8), and the third imaging unit 12 is 12 pitches (P x 12)).

In this case, if the intermittent feeding of the film F is performed at a proper feeding pitch P, it is preferable to set the film F so that the mark M on the film F is located at the origin of an XY coordinate system arbitrarily set within each imaging field of view when the intermittent feeding stops. In this way, the error with respect to the proper feeding pitch P (hereinafter also referred to as "feeding pitch error") and the meandering width of the film F when meandering occurs can be measured depending on how far the position of the mark M actually captured by the imaging units 10, 11, and 12 is from the origin. When setting the XY coordinate system within these imaging fields of view, for example, if the X axis is taken in the feeding direction of the film F and the Y axis is taken in the direction perpendicular to the feeding direction of the film F as shown in Figure 3, the feed pitch error can be measured by the value of the X coordinate, and the meandering width of the film F can be measured by the value of the Y coordinate.
FIG. 3 shows a state in which the mark M is located at the origin of an XY coordinate system set within the imaging field of view (View Area), and the arrow in the figure indicates the feed direction of the film F.

The feedback control unit 9 feedback controls the operation of the bag making device 1 based on the position information of the mark M captured by each of the imaging units 10, 11, and 12 installed in this manner, as follows:

[Feed pitch error correction]
To manufacture the packaging container 100 using the bag making apparatus 1, first, two films F supplied from the film supply unit are unwound while being overlapped by the guide rolls 2 with their edges aligned, and set in the bag making apparatus 1.

Next, the intermediate feed rollers 4 and the downstream feed rollers 6 are driven to feed the film F intermittently at a preset feed pitch (initial value), and at each intermittent feed, the marker unit 8 marks the edge of the film F. As a result, marks M are made on the film F at predetermined intervals corresponding to the feed pitch of the film F (see FIG. 1(b)).
In the illustrated example, the bottom seal 101 is formed to avoid the edge side of the film F bearing the mark M, and the bag making apparatus 1 is configured so that this edge side is removed when the film F is cut to a specified shape, but this is not limited to this as long as the mark M does not impair the appearance of the packaging container 100 being manufactured.

In this way, when the operation of the bag making device 1 is started, the first imaging unit 10, the second imaging unit 11, and the third imaging unit 12 each capture an image of the mark M affixed to the film F, and the image data is analyzed by an image analysis program stored in the feedback control unit 9 to derive position information of the mark M captured by each of the imaging units 10, 11, and 12.

Then, based on the position information of the mark M imaged by the first imaging unit 10, the error with respect to the appropriate feed pitch P is measured for each intermittent feed. As a result, if the actual feed pitch is large (when X>0 in the XY coordinate system set within the imaging field of view of the first imaging unit 10), the rotation amount of the intermediate feed roller 4 is accordingly decreased, and if the actual feed pitch is small (when X<0 in the same XY coordinate system), the rotation amount of the intermediate feed roller 4 is accordingly increased, thereby feedback controlling the drive of the intermediate feed roller 4 so that the feed pitch error is corrected.

In this way, by adjusting the amount of rotation of the intermediate feed roller 4 for each intermittent feed based on the position information of the mark M captured by the first imaging unit 10 and feedback controlling the feed pitch of the film by the intermediate feed roller 4, it is possible to precisely perform intermittent feed of the film F by the intermediate feed roller 4 at the appropriate feed pitch P while applying marks M to the film F at intervals equal to the appropriate feed pitch P. As a result, it is possible to suppress misalignment of the sealing position by the first heat sealing unit and the second heat sealing unit 5 and the cutting position by the cutting unit 7.

In this case, since the first imaging unit 10 is installed upstream of the first heat sealing unit 3, it is not affected by the expansion and contraction of the film F due to heat sealing, and the feed pitch error can be measured with high accuracy and reflected in the feedback control of the intermediate feed roller 4.

Furthermore, if the film F meanders, the position of the mark M will shift in the Y-axis direction in the XY coordinate system set as described above. In this case, the feed pitch error will have to be measured taking into account the Y-coordinate value, which is not desirable in terms of measuring the feed pitch error with high accuracy.

Therefore, it is preferable to install the first imaging unit 10 as close as possible to the marker unit 8 so that the feed pitch error can be measured before the film F begins to meander. For this reason, in the illustrated example, the position at which the first imaging unit 10 is installed relative to the marking position of the mark M by the marker unit 8 is one pitch of the appropriate feed pitch P. This configuration shortens the transport path of the film F, eliminates as much as possible the causes of feed pitch errors and meandering, and is also preferable in terms of saving space in the device.

On the other hand, even if the film F is intermittently fed by the intermediate feed rollers 4 with high accuracy at the appropriate feed pitch P, there is a risk that a feed pitch error will occur downstream after the heat sealing process by the first heat sealing unit 3 and the second heat sealing unit 5 due to the expansion and contraction of the film F caused by heat sealing. For this reason, it is preferable to measure the feed pitch error downstream in the feed direction of the film F for each intermittent feed based on the position information of the mark M captured by the third imaging unit 12 installed between the second heat sealing unit 5 and the downstream feed rollers 6, and feedback control the downstream feed rollers 6 separately from the intermediate feed rollers 4 so that the error is corrected.

As a result of the feedback control of the intermediate feed rollers 4 as described above, marks M are provided on the film F at intervals equal to the appropriate feed pitch P. For this reason, by feedback controlling the drive of the downstream feed roller 6 and adjusting the amount of rotation for each intermittent feed so that mark M is located at the origin of an XY coordinate system set within the imaging field of view of the third imaging unit 12, it is possible to correct the feed pitch error on the downstream side in the feed direction of the film F.
That is, in an XY coordinate system set within the imaging field of view of the third imaging unit 12, when X>0, the drive of the downstream feed roller 6 is feedback controlled so that the amount of rotation of the downstream feed roller 6 is accordingly decreased, and when X<0, the drive of the downstream feed roller 6 is accordingly increased.

In this way, by feedback controlling the downstream feed rollers 6 separately from the intermediate feed rollers 4, even if a feed pitch error occurs downstream in the feed direction of the film F due to expansion and contraction of the film F caused by heat sealing, it is possible to feed the film F5 to the cutting unit 7 at an appropriate feed pitch P while correcting such an error. This more reliably suppresses deviations in the cutting position by the cutting unit 7, making it possible to cut the packaging container 100 into the specified shape with greater precision.

Although not specifically shown, the downstream feed roller 6 is configured to drive in synchronization with the intermediate feed roller 4 at the same rotational distance, and the cutting unit 7 is configured to be movable in the feed direction or counter-feed direction of the film F depending on the feed pitch error downstream in the feed direction of the film F measured based on the position information of the mark M imaged by the third imaging unit 12, thereby suppressing positional deviation during the cutting process.
This embodiment is effective when the feed pitch error caused by the expansion and contraction of the film F is large and cannot be corrected by simply adjusting the amount of rotation of the downstream feed roller 6.

[Meandering correction]
In addition, when meandering occurs in the film F while it is running, the feedback control unit 9 can correct the meandering of the film F by feedback controlling the rotation angles of the intermediate feed roller 4 and the downstream feed roller 6, which are installed so as to be rotatable in the feed direction and counter-feed direction of the film F.

For example, the meandering width of the film F is measured for each intermittent feed based on the position information of the mark M captured by the second imaging unit 11. If meandering to the left of the feed direction is observed (when Y>0 in the XY coordinate system set within the imaging field of view of the second imaging unit 11), the intermediate feed roller 4 rotates in the feed direction of the film F at an angle corresponding to the meandering width. If meandering to the right of the feed direction is observed (when Y<0 in the same XY coordinate system), the rotation angle of the intermediate feed roller 4 is adjusted so that the intermediate feed roller 4 rotates in the counter-feed direction of the film F at an angle corresponding to the meandering width. The meandering of the film F can be corrected by feedback controlling the feed direction of the film F by the intermediate feed roller 4.

Similarly, the meandering width of the film F is measured for each intermittent feed based on the position information of the mark M captured by the third imaging unit 12. If meandering to the left of the feed direction is observed (when Y>0 in the XY coordinate system set within the imaging field of view of the third imaging unit 12), the downstream feed roller 6 rotates in the feed direction of the film F at an angle corresponding to the meandering width. If meandering to the right of the feed direction is observed (when Y<0 in the same XY coordinate system), the downstream feed roller 6 rotates in the counter-feed direction of the film F at an angle corresponding to the meandering width. By adjusting the rotation angle, the downstream feed roller 6 rotates in the opposite direction of the feed direction of the film F at an angle corresponding to the meandering width. The meandering of the film F can be corrected by feedback controlling the feed direction of the film F by the downstream feed roller 6.

In addition, when correcting the meandering of the film F when meandering occurs, instead of installing the intermediate feed roller 4 and the downstream feed roller 6 so that they can rotate in the feed direction and counter-feed direction of the film F, for example, although not specifically shown, a transport guide unit that abuts against both side edges of the film F and is configured to be movable in a direction perpendicular to the feed direction of the film F may be installed. In such an embodiment, the meandering of the film F can be corrected by moving the transport guide unit according to the meandering width measured based on the position information of the mark M captured by the second imaging unit 11 and the third imaging unit 12.

[Correction of sealing position by second heat seal unit]
Furthermore, if expansion or contraction occurs in the film F that has undergone the heat sealing process by the first heat sealing unit 3 due to heat sealing, when the side seal portion 102 is formed by the second heat sealing unit 5, the sealing position may be shifted relative to the bottom seal portion 101 formed by the first heat sealing unit 3. To prevent such problems, the feedback control unit 9 can perform feedback control to measure the expansion or contraction rate when expansion or contraction of the film F is recognized based on the position information of the mark M captured by the second imaging unit 11 and the position information of the mark M captured by the third imaging unit 12, and correct the sealing position by the second heat sealing unit 5 accordingly.

For example, the amount of expansion and contraction of the film F is calculated by subtracting the X coordinate value (X2) in the XY coordinate system set within the field of view of the second imaging unit 11 from the X coordinate value (X3) in the XY coordinate system set within the field of view of the third imaging unit 12 (X3-X2). In the illustrated example, since the installation distance between the third imaging unit 12 and the second imaging unit 11 is Px12-Px8, the expansion and contraction rate of the film F is ((Px12-Px8)+(X3-X2))/(Px12-Px8). For each intermittent feed, the appropriate position for forming the side seal portion 102 by the second heat seal unit 5 is calculated from the expansion and contraction rate, and the second heat seal unit 5 is moved in the feed direction or counter-feed direction of the film F accordingly, thereby performing feedback control to correct the seal position.

In this way, by operating the second heat sealing unit 5 while correcting the sealing position by the second heat sealing unit 5 for each intermittent feed, it is possible to more reliably suppress misalignment of the sealing position by the second heat sealing unit 5, and to more accurately form the side seal portion 102 in the appropriate position relative to the bottom seal portion 101 formed by the first heat sealing unit 3.

According to this embodiment, by feedback-controlling the operation of the bag-making device 1 as described above, the film F can be intermittently fed with precision at an appropriate feed pitch according to the dimensions and shape of the packaging container 100 to be manufactured. As a result, misalignment of the sealing position by the first heat-sealing unit 3 and the second heat-sealing unit 5 and the cutting position by the cutting unit 7 can be suppressed, and bag-shaped packaging containers 100 can be manufactured with a high yield. Furthermore, by continuing the feedback control for each intermittent feed even after the operation of the bag-making device 1 has stabilized, it is possible to suppress fluctuations in the feed pitch of the film F during operation and the occurrence of meandering, thereby significantly reducing the burden on the operator.

In addition, in this embodiment, the operation of the bag making device 1 is feedback controlled as described above using the mark M applied to the film F by the marker unit 8, so this is particularly suitable for manufacturing bag-shaped packaging containers 100 using a plain film F that has no pattern printed on it that can serve as a marker for detecting the feed pitch of the film F, or a film F that has a stripe pattern printed on it that does not change along the longitudinal direction.

The present invention has been described above by showing preferred embodiments, but it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the present invention.

REFERENCE SIGNS LIST 1 bag making device 3 first heat seal unit 4 intermediate feed roller 5 second heat seal unit 6 downstream feed roller 7 cutting unit 8 marker section 9 feedback control section 10 first imaging section 11 second imaging section 12 third imaging section F film M mark P proper feed pitch

Claims (12)

A bag making apparatus for producing a bag-shaped packaging container by feeding and overlapping a long film while feeding it intermittently and heat sealing it, comprising:
A first heat-sealing unit, a second heat-sealing unit, and a cutting unit are provided in this order along the feeding direction of the film,
The film is intermittently fed by an intermediate feed roller installed between the first heat-sealing unit and the second heat-sealing unit, and a downstream feed roller installed between the second heat-sealing unit and the cutting unit;
A marker unit is provided upstream of the first heat seal unit to mark the film for each intermittent feed,
a feedback control unit having a first imaging unit installed between the marker unit and the first heat-sealing unit so that an imaging field of view includes a position that is a positive integer multiple of an appropriate feed pitch along the feed direction of the film from a marking position of the mark by the marker unit;
A bag making apparatus characterized in that the feedback control unit adjusts the amount of rotation of the intermediate feed roller based on position information of the mark imaged by the first imaging unit, thereby feedback controlling the feed pitch of the film by the intermediate feed roller. The bag making apparatus according to claim 1, wherein the first imaging unit is installed so as to include in its imaging field of view a position that is a distance of one appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit. The feedback control unit,
a position that is a positive integer multiple of a proper feed pitch along the film feed direction from the marking position of the mark by the marker unit is included in the imaging field of view,
A second imaging unit disposed between the intermediate feed roller and the second heat seal unit;
3. The bag making apparatus according to claim 1, further comprising: a third imaging unit disposed between the second heat sealing unit and the downstream feed roller; or both of the second heat sealing unit and the third imaging unit disposed between the downstream feed roller. The bag making device according to claim 3, wherein the feedback control unit adjusts the amount of rotation of the downstream feed roller based on position information of the mark captured by the third imaging unit, thereby feedback controlling the feed pitch of the film by the downstream feed roller. The intermediate feed roller is rotatably disposed in the feed direction and the counter-feed direction of the film,
The bag making apparatus according to claim 3 or 4, wherein the feedback control unit adjusts the rotation angle of the intermediate feed roller based on position information of the mark imaged by the second imaging unit, thereby feedback controlling the feed direction of the film by the intermediate feed roller. The downstream feed roller is rotatably mounted in the feed direction and the counter-feed direction of the film,
A bag making apparatus as described in any one of claims 3 to 5, wherein the feedback control unit adjusts the rotation angle of the downstream feed roller based on position information of the mark imaged by the third imaging unit, thereby feedback controlling the feed direction of the film by the downstream feed roller. The bag making device according to any one of claims 3 to 6, wherein the feedback control unit feedback controls the sealing position of the second heat seal unit based on position information of the mark captured by the second imaging unit and position information of the mark captured by the third imaging unit. In a method for producing a bag-shaped packaging container, a long film is unwound and overlapped, and the film is intermittently fed in the order of a first heat-sealing unit, a second heat-sealing unit, and a cutting unit by an intermediate feed roller disposed between the first heat-sealing unit and the second heat-sealing unit, and a downstream feed roller disposed between the second heat-sealing unit and the cutting unit,
a marker unit provided upstream of the first heat seal unit marks the film at each intermittent feed;
A method for manufacturing a bag-shaped packaging container, characterized in that an error with respect to the appropriate feed pitch is measured based on position information of the mark imaged by a first imaging unit installed between the marker unit and the first heat sealing unit so that a position that is a positive integer multiple of the appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit is included in the imaging field of view, and the film is intermittently fed while performing feedback control to adjust the rotation amount of the intermediate feed roller so as to correct the error. 9. A method for manufacturing a bag-shaped packaging container as described in claim 8, wherein an error with respect to a proper feed pitch downstream in the feed direction of the film is measured based on position information of the mark captured by a third imaging unit installed between the second heat sealing unit and the downstream feed roller so that a position that is a positive integer multiple of the proper feed pitch along the feed direction of the film from the marking position of the mark by the marker unit is included in the imaging field of view, and the film is intermittently fed while performing feedback control that controls the rotation amount of the downstream feed roller separately from the intermediate feed roller so as to correct the error. A method for manufacturing a bag-shaped packaging container as described in claim 8 or 9, in which when meandering of the film is detected based on position information of the mark imaged by a second imaging unit installed between the intermediate feed roller and the second heat sealing unit, the feed direction of the film is feedback-controlled by adjusting the rotation angle of the intermediate feed roller, which is installed to be rotatable in the feed direction and counter-feed direction of the film, so that the imaging field includes a position that is a positive integer multiple of an appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit. A method for manufacturing a bag-shaped packaging container as described in any one of claims 8 to 10, in which, when meandering of the film is detected based on position information of the mark captured by a third imaging unit installed between the second heat sealing unit and the downstream feed roller so that a position that is a positive integer multiple of an appropriate feed pitch away from the marking position of the mark by the marker unit in the feed direction of the film is included in the imaging field of view, the rotation angle of the downstream feed roller, which is installed to be rotatable in the feed direction and counter-feed direction of the film, is adjusted to feedback control the feed direction of the film. A method for manufacturing a bag-shaped packaging container according to any one of claims 8 to 11, wherein, when expansion or contraction of the film is detected, the sealing position by the second heat-sealing unit is feedback-controlled based on position information of the mark captured by a second imaging unit installed between the intermediate feed roller and the second heat-sealing unit and position information of the mark captured by a third imaging unit installed between the second heat-sealing unit and the downstream feed roller so that an imaging field of view includes a position that is a positive integer multiple of an appropriate feed pitch along the feed direction of the film from the marking position of the mark by the marker unit.

Images