JP2013107652A - Hem formation film conveyance mechanism and bag making and packing machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hem formation film conveyance mechanism for stably forming hems, and a bag making and packing machine including the same.SOLUTION: The hem formation film conveyance mechanism includes: a conveying part 32, a hem forming part 4, a detecting part 5, and a tension adjusting part 33. The conveying part is configured to convey the film. The hem forming part is configured to form the hems on the film along the conveying direction. The detecting part is configured to detect the width of the film with the hems formed thereon. The tension adjusting part is configured to change the tension of at least a part of the film to be conveyed to the hem forming part, on the basis of a result detected by the detecting part.

Description

  The present invention relates to a transport mechanism for a hem-forming film and a bag making and packaging machine provided with a transport mechanism for a hem-forming film.

  Conventionally, a technique for changing the mode of a film while conveying the film has been used. For example, in a bag making and packaging machine as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-105740), a film is sent to a bag making unit by a transport unit, and the film is transformed into a bag by the bag making unit. . Specifically, hem is formed on the film during the film transport process. Thereafter, the film on which the hem is formed is deformed into a rectangular tube shape, and then the rectangular tube-shaped film is deformed into a bag.

  By the way, when hem is formed on a film during the film conveyance process, it may be difficult to reliably form hem depending on the film conveyance state. As a result, the final product (for example, a finished product such as a bag) may not be properly formed.

  The subject of this invention is providing the bag making packaging machine provided with the conveyance mechanism of the hem formation film which enables stable formation of hem, or the conveyance mechanism of a hem formation film.

  The transport mechanism for a film for forming a hem according to the present invention includes a transport unit, a hem forming unit, a detection unit, and a tension adjusting unit. A conveyance part conveys a film. A hem formation part forms hem in a film along a conveyance direction. A detection part detects the width dimension of the film after hem is formed. The tension adjusting unit changes the tension of at least a part of the film conveyed to the hem forming unit based on the detection result by the detecting unit.

  Thereby, hem can be formed stably.

  Moreover, it is preferable that the conveyance mechanism of the hem formation film which concerns on this invention is further provided with a dancer roller. The dancer roller is placed upstream of the hem forming section and adjusts the overall tension of the film.

  Thereby, wrinkles formed on the film can be reduced.

  Moreover, it is preferable that a tension adjustment part has a folding | turning member. The folded member is a member disposed on the upstream side of the hem forming portion. The folding member is a member that folds the film conveyed by the conveyance unit and further curves the film.

  Thereby, hem can be formed reliably.

  Moreover, it is preferable that a tension | tensile_strength adjustment part changes the tension | tensile_strength of the width direction center of a film or the width direction edge part of a film by changing the conveyance angle of the film conveyed to a folding | turning member.

  Thereby, the width dimension of the hem can be adjusted.

  Moreover, it is preferable that a tension | tensile_strength adjustment part fluctuates the conveyance angle of the film conveyed to a folding | turning member to an acute angle direction, when the width dimension of a film is smaller than a predetermined dimension. Moreover, when the width dimension of a film is larger than a predetermined dimension, it is preferable to change the conveyance angle of the film conveyed to a folding | turning member to an obtuse angle direction.

  Thereby, based on the width dimension of the film after heme formation, the width dimension of the hem formed in a subsequent film can be adjusted.

  Moreover, it is preferable that a tension adjustment part further has a roller and a support mechanism. The roller is disposed upstream of the folding member. The support mechanism supports the roller such that at least one of the horizontal position and the height position of the roller can be changed. Moreover, it is preferable that a support mechanism changes the conveyance angle of the film conveyed to a folding | turning member by fluctuating at least any one of the horizontal position and height position of a roller.

  Thereby, the width dimension of the hem can be adjusted.

  Moreover, it is preferable that a tension adjustment part further has a support mechanism. The support mechanism supports the folding member so that the inclination of the folding member with respect to the horizontal plane can be changed. Moreover, it is preferable that a support mechanism changes the conveyance angle of the film conveyed by a folding member by fluctuating the inclination of the folding member with respect to a horizontal surface.

  Thereby, the width dimension of the hem can be adjusted.

  Moreover, it is preferable that the transport mechanism of the hem-forming film according to the present invention further includes a pressing member. The pressing member is disposed on at least one side in the width direction of the film in the path from the tension adjusting unit to the hem forming unit, and presses the end of the film based on the detection result by the detecting unit.

  Thereby, meandering of the film can be reduced.

  Moreover, it is preferable that a detection result contains the information regarding the bias | inclination of the film in the width direction of a film. The pressing member preferably includes a first member, a second member, and a drive unit. A 1st member is a member for pressing the width direction 1st edge part of a film. The second member is a member for pressing the second end. The second end is the opposite end of the film relative to the first end. The drive unit drives the first member and the second member. The drive unit drives the second member when the detection unit detects the deviation of the film toward the first end, and the detection unit detects the deviation of the film toward the second end. In such a case, it is preferable to drive the first member.

  Thereby, the conveyance state of a subsequent film can be adjusted based on the degree of the bias of the film after hem formation.

  Moreover, it is preferable that the bag making packaging machine which concerns on this invention is provided with the conveyance mechanism of a film for hem formation, a 1st seal mechanism, and a 2nd seal mechanism. The first sealing mechanism heat seals both ends in the width direction of the film on which the hem is formed. The second sealing mechanism heat-seals the film sealed by the first sealing mechanism in a direction crossing the film conveyance direction, and manufactures a bag in which an object to be packaged is packaged.

  Thereby, a suitable bag can be formed.

  The hem forming film transport mechanism according to the present invention can stably form hem.

It is an external appearance perspective view of a bag making packaging machine. It is a schematic perspective view which shows the conveyance path | route of a film. It is a schematic side view which shows the conveyance path | route of a film. It is a figure which shows the drive of an acute angle direction by a rocking | swiveling unit, and the change of a folding angle. It is a figure which shows the drive of an obtuse angle direction by a rocking | swiveling unit, and the change of a folding angle. It is a schematic perspective view of a bending deformation member and a hem formation unit. It is the schematic of a curved deformation member and a pusher. It is the schematic of a hem formation unit. It is a figure which shows a motion of a horizontal sealing mechanism. It is a figure which shows a motion of a gusset formation mechanism. It is a figure which shows a motion of a gusset formation mechanism. It is a control block diagram. It is a figure which shows the example of the basic information memorize | stored in the control unit. It is a figure which shows the example in case a film position and the width dimension of a film are appropriate. It is a figure which shows the example in case the width dimension of a film is smaller than an appropriate width dimension. It is a figure which shows the example in case the width dimension of a film is larger than an appropriate width dimension. It is a figure which shows the example in case the width dimension of a film is an appropriate width dimension, and the film is biased. An example in which the width dimension of the film is smaller than the appropriate width dimension and the center in the width direction of the film F is shifted from the center in the width direction of the conveyance path is shown. An example in which the width dimension of the film is larger than the appropriate width dimension and the center in the width direction of the film F is deviated from the center in the width direction of the conveyance path is shown. It is a figure which shows the flow of control of a rocking | swiveling unit and a pusher. It is a figure which shows the example of the bag manufactured with the bag making packaging machine which concerns on this embodiment. It is a figure which shows the example of the bag making packaging machine which concerns on the modification C.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment is an example of the present invention, and does not limit the technical scope of the present invention.

(1) Whole structure First, the whole structure of the bag making packaging machine 1 is demonstrated using FIGS. 1-3. The bag making and packaging machine 1 is a machine for bagging articles C such as snacks in the bag B while forming the bag B from the film F. The bag making and packaging machine 1 mainly includes a film supply unit 2, a film transport mechanism 3, a hem forming unit 4, a film detection unit 5, and a bag making and packaging unit 6. The bag making and packaging machine 1 further includes a control unit 7 that is connected to each of these components and exchanges various signals (see FIG. 12).

  The film supply unit 2 supplies the sheet-like film F to the bag making and packaging unit 6. The film transport mechanism 3 transports the film F supplied from the film supply unit 2 to the bag making and packaging unit 6. The hem forming unit 4 is a mechanism for forming portions (hems H1 to H4) corresponding to the corners of the bag B (see FIG. 21). Moreover, the film detection unit 5 detects the film F after the hems H1 to H4 are formed, and acquires the position information of the film F. Here, the position information of the film F is information regarding the position of the end portion in the width direction of the film F and the deviation in the width direction of the film F (film position). The bag making and packaging unit 6 is a unit that packs articles C into the bag B while forming the sheet-like film F supplied from the film supply unit 2 into the bag B. The bag making and packaging unit 6 manufactures a gusseted bag B as shown in FIG. The bag B has four side portions F1 to F4. In the bag B, a gusset G, four hems H1 to H4, a vertical seal portion L1, an upper horizontal seal portion T1, and a lower horizontal seal portion T2 are formed. The bag B is formed by bending a predetermined position of the sheet-like film F to form the hems H1 to H4, and further heat-sealing (thermal welding) the predetermined position. The bag making and packaging unit 6 is provided with operation switches 91 on the right side when facing the front. Further, a touch panel display 8 capable of inputting various settings is arranged at a position where a user who operates the operation switches 91 can visually recognize.

  The front side of the bag making and packaging machine 1 refers to the side on which the liquid crystal display 8 of the bag making and packaging machine 1 shown in FIG. 1 is attached. Further, regarding the bag making and packaging machine 1, “left” and “right” are based on the case where the bag making and packaging machine 1 is viewed from the front side. Further, the transport direction is the transport direction of the film F or the rectangular tube film Fc. Furthermore, “left side” and “right side” in the transport direction are based on the case where the downstream side is viewed from the upstream side in the transport direction while standing on the rear side of the bag making and packaging machine 1. Hereinafter, the structure of each part of the bag making and packaging machine 1 will be described in detail.

(2) Configuration of Each Part (2-1) Film Supply Unit The film supply unit 2 supplies the sheet-like film F to the forming mechanism 61 of the bag making and packaging unit 6. The film supply unit 2 mainly has a film roller 20 (see FIG. 1). A film roll FR around which the film F is wound is set on the film roller 20. The film roller 20 is rotationally driven by a motor (not shown). The film F is fed out from the film roll FR by the rotational drive of the motor. The film F supplied from the film supply unit 2 is transported to the bag making and packaging unit 6 by the film transport mechanism 3.

(2-2) Film Transport Mechanism FIG. 2 shows a transport path of the film F transported from the film supply unit 2 to the bag making and packaging unit 6 by the film transport mechanism 3. The film transport mechanism 3 transports the film F downstream by guiding the film F supplied by the film supply unit 2 to a predetermined transport path. The film transport mechanism 3 transports the film F while applying tension to the film F so that the film F does not bend in the transport direction and the width direction. As illustrated in FIG. 2 or 3, the film transport mechanism 3 includes a guide roller 31, a pull-down belt 32, a tension adjustment mechanism 33, and a pusher 37.

(2-2-1) Guide roller The guide roller 31 is a roller that guides the film F to the transport path. A plurality of guide rollers 31 are arranged in the transport path of the film F. The film F is sent downstream along the plurality of guide rollers 31. The guide roller 31 extends in the width direction of the film F.

(2-2-2) Pull-down belt The pull-down belt 32 includes a pair of belts 32a and 32b. The pair of belts 32a and 32b are provided inside a bag making and packaging unit 6 to be described later. Specifically, the pair of belts 32a and 32b are arranged symmetrically about a tube 61a extending in the vertical direction as an axis. The pull-down belt 32 is in contact with a film (square tube film) Fc wound around the tube 61a and formed into a rectangular tube shape, and conveys the rectangular tube film Fc downward while adsorbing the rectangular tube film Fc. .

(2-2-3) Tension Adjustment Mechanism The tension adjustment mechanism 33 is a mechanism that adjusts the tension of the film F supplied by the film supply unit 2. The tension adjustment mechanism 33 is mainly configured by a dancer roller 34, a swing unit 35, and a bending deformation member 36.

(A) Dancer roller The dancer roller 34 is a roller that guides the film F to the transport path, like the guide roller 31. The dancer roller 34 adjusts the overall tension of the film F. Specifically, the dancer roller 34 has a function of maintaining the tension in the entire width direction of the film F within a predetermined range. Specifically, the dancer roller 34 is supported so as to be vertically movable with a predetermined position as a reference. The dancer roller 34 is configured to move upward when the tension applied to the film F is larger than a predetermined value, and to move downward when the tension is smaller than the predetermined value. A load cell is attached to one end of the dancer roller 34 via a tension spring 38. The load cell detects the amount of deviation of the dancer roller 34 from the reference position, and the motor of the film roller 20 is driven based on the detected amount of deviation. In other words, the rotational speed of the film roller 20 is changed based on the amount of deviation of the dancer roller 34.

(B) Oscillating unit The oscillating unit 35 guides the film F guided by the guide roller 31 to a bending deformation member 36 described later. The film F is stretched over the bending deformation member 36 from the swing roller 351.

  As shown in FIG. 3, the swing unit 35 mainly includes a swing roller 351 and a swing mechanism (corresponding to a support mechanism) 352. The swing roller 351 extends in the width direction of the film F. The swing roller 351 extends parallel to the guide roller 31. A film F sent from the upstream guide roller 31 is stretched over the swing roller 351. The swing mechanism 352 supports the swing roller 351 so as to be swingable. The swing mechanism 352 mainly includes a connecting member 352a, a support shaft 352b, a swing shaft 352c, and an electric cylinder 352d. The connecting member 352a connects the swing roller 351 and the support shaft 352b. The connecting member 352a is supported by the swing shaft 352c. The connecting member 352a can swing around the swing shaft 352c. When the electric cylinder 352d is driven, the vertical position of the support shaft 352b is changed. As the vertical position of the support shaft 352b varies, the connecting member 352a swings the swing roller 351 about the swing shaft 352c (see arrow R1 in FIG. 3). By driving the electric cylinder 352d, the swing roller 351 swings along a track as indicated by a broken line. That is, the height position and the horizontal position of the swing roller 351 are changed by driving the electric cylinder 352d. In other words, the center O of the swing roller 351 moves in the vertical direction and the horizontal direction (see FIGS. 4 and 5). When the height position and the horizontal position of the swing roller 351 change, the folding position (vertical position and horizontal position) of the film F by the swing roller 315 also changes. FIG. 4 shows an example in which the swing roller 351 is swung upward, and FIG. 5 shows an example in which the swing roller 351 is swung downward. In FIG. 4, when the swing mechanism 352 swings the swing roller 351 upward, the height position of the center O of the swing roller 351 changes from v0 to v1, and the horizontal position changes from h0 to h1. did. In FIG. 5, the swing mechanism 352 swings the swing roller 351 downward, so that the height position of the center O of the swing roller 351 changes from v0 to v2, and the horizontal position changes from h0 to h2. Changed.

  Further, the swinging mechanism 352 swings the swinging roller 351 to change the height position and the horizontal position of the swinging roller 351, whereby the film F conveyed from the swinging roller 351 to the bending deformation member 36 is changed. The inclination of the transport surface varies. Here, the inclination of the conveyance surface of the film F conveyed from the swing roller 351 to the bending deformation member 36 is an inclination (conveyance angle) of the conveyance surface CS2 with respect to the horizontal plane. Further, as the conveyance angle varies, the inclination (folding angle) θ of the conveyance surface CS2 of the film F with respect to the conveyance surface CS1 of the film F conveyed to the hem forming unit 4 also varies. By changing the conveyance angle or the folding angle θ, the tension in the width direction of the film F that contacts the bending deformation member 36 changes. Specifically, due to the change in the folding angle, each part in the width direction of the film F contacts the curved edge 36a with a different tension. Specifically, as shown in FIG. 4, when the folding angle θ fluctuates in an acute angle direction (θ1 to θ2), the tension at the center in the width direction of the film F decreases and the tension at the end in the width direction of the film F. Will increase. On the other hand, as shown in FIG. 5, when the folding angle θ fluctuates in the obtuse angle direction (θ1 to θ3), the tension at the end in the width direction of the film F decreases and the tension at the center in the width direction of the film F increases. To do. When the tension at the central portion and the end portion in the width direction of the film F varies, the degree of deflection of the film F sent to the hem forming unit 4 changes.

  In addition, the width dimension of hems H1-H4 fluctuates when the bending condition of the film F sent to the hem formation unit 4 changes. Therefore, the oscillating unit 35 varies the folding angle θ in order to vary the width dimension of the hems H1 to H4. Specifically, the oscillating unit 35 varies the folding angle θ in an acute angle direction in order to reduce the width dimension of the hems H1 to H4 (see FIG. 4). More specifically, the swing mechanism 352 swings the swing roller 351 upward to change the height position and horizontal position of the swing roller 351 in order to reduce the width dimension of the hems H1 to H4. . Thereby, the folding angle θ of the film F becomes an acute angle θ2 than the folding angle θ1 before the movement. Further, the oscillating unit 35 varies the folding angle θ in the obtuse angle direction in order to increase the width dimension of the hems H1 to H4 (see FIG. 5). More specifically, the swing mechanism 352 swings the swing roller 351 downward to change the height position and horizontal position of the swing roller 351 in order to increase the width dimension of the hems H1 to H4. . Thereby, the folding angle θ of the film F becomes an obtuse angle θ3 than the folding angle θ1 before the movement.

(C) Bending Deformation Member The bending deformation member 36 is a member that folds the film F spanned from the swing unit 35 and then curves the film F. In other words, the bending deformation member 36 is a member that bends the film F in front of the hem forming unit 4 and deforms the film F so that the hems H1 to H4 can be easily formed. As shown in FIG. 2, the bending deformation member 36 is disposed on the rear side of the bag making and packaging machine 1. Further, the bending deformation member 36 is disposed on the upstream side of the hem forming unit 4.

  6 and 7 show the bending deformation member 36. The bending deformation member 36 has a bending edge 36a and a bending surface 36b. The curved edge 36a has a symmetrical curve with respect to the center line CL shown in FIGS. The film F contacts the curved edge 36a at a predetermined angle, and then is folded back. Here, the predetermined angle is an angle (conveyance angle) that constitutes the folding angle θ and varies depending on the operation of the swing unit 35 described above. As described above, different tensions are applied to the portion (contact portion) of the film F that contacts the curved edge 36a in the width direction. The film F that has come into contact with the curved edge 36a is then sent to the hem forming unit 4 without being along the curved surface 36b (see FIG. 3).

(2-2-4) Pusher The pusher 37 changes the deviation in the width direction of the film F sent to the hem forming unit 4. The deviation in the width direction of the film F means that the width direction center C1 of the conveyance path P and the width direction center C2 of the film F are in a shifted position. That is, the pusher 37 has a function of moving the film F so that the width direction center C2 of the film F coincides with the width direction center C1 of the transport path P. In other words, the pusher 37 moves the film F in the width direction when the width direction center C2 of the film F is shifted to either the left or right direction with respect to the width direction center C1 of the transport path P. The width direction center C1 of P and the width direction center C2 of the film F are made to coincide. The conveyance path P is a virtual path formed by the guide roller 31, the dancer roller 34, and the like. The center in the width direction of the transport path P is a position where the center in the width direction of the guide roller 31 and the dancer roller 34 is virtually extended. Here, the center in the width direction of the transport path P is the center in the width direction of the guide roller 31 and the dancer roller 34 with which the film F contacts when the film F is transported suitably. That is, the center in the width direction of the conveyance path P and the center in the width direction of the actual size of the guide roller 31 and the dancer roller 34 may not coincide with each other. In the present embodiment, the pusher 37 is disposed on the conveyance path from the swing unit 35 to the bending deformation member 36.

  As shown in FIG. 7, the pusher 37 mainly includes a first pusher 37a and a second pusher 37b. The first pusher 37a is disposed in the vicinity of the right end of the film F in the width direction in the transport direction. The 2nd pusher 37b is arrange | positioned in the width direction left side edge part vicinity of the film F toward the conveyance direction.

  As shown in FIG. 7, the first pusher 37a and the second pusher 37b are mainly configured by a contact surface 371 that contacts the film F and a cylinder 372 that moves the contact surface 371 in the vertical direction. The cylinder 372 operates based on a detection result based on a film detection unit 5 described later. Specifically, the cylinder 372 moves the contact surface 371 so as to approach or separate from the film F in accordance with a control signal (ON / OFF signal) sent from the control unit 7. When the contact surface 371 is in the proximity position closest to the film F, the contact surface 371 contacts the film F. In other words, the first pusher 37a and the second pusher 37b move the contact surface 371 toward the close position by the cylinder 372 and lightly press the film F to such an extent that the film F can be conveyed. The first pusher 37a presses the right end of the film F in the transport direction, and the second pusher 37b presses the left end of the film F in the transport direction.

  The first pusher 37a and the second pusher 37b are driven in accordance with the direction in which the width direction center C2 of the film F is desired to be moved. Specifically, when the direction in which the width direction center C2 of the film F is desired to move is the left side in the transport direction, the second pusher 37b disposed on the left side in the transport direction is driven (FIG. 7). reference). When the direction in which the width direction center C2 of the film F is to be moved is the right side in the transport direction, the first pusher 37a disposed on the right side in the transport direction is driven (see FIG. 7). . That is, the direction in which the center C2 in the width direction of the film F is desired to move and the direction in which the driven pusher is disposed are the same.

  The first pusher 37a and the second pusher 37b are subjected to feedback control. Specifically, each of the first pusher 37a and the second pusher 37b repeats the approach / separation movement of the contact surface 371 with a predetermined time interval until the detection result by the film detection unit 5 indicates an appropriate state. In other words, each of the first pusher 37a and the second pusher 37b presses the end of the film F with a predetermined time interval until there is no deviation in the width direction of the film F. Here, the predetermined time interval is an arbitrary time interval. In addition, the time for which the first pusher 37a and the second pusher 37b each press the film F (pressing time) is changed stepwise. Specifically, the pressing time is increased stepwise. Further, the elimination of the deviation in the width direction of the film F means that the deviation amount between the width direction center C2 of the film F and the width direction center C1 of the transport path P becomes a value within an appropriate range.

(2-3) Heme Formation Unit The hem formation unit 4 forms hems H1 to H4 on the film F. Hem H1-H4 is a part which comprises the corner | angular part of the bag B (refer FIG. 21). The hems H1 to H4 are formed along the longitudinal direction of the bag B. As shown in FIGS. 2 and 3, the hem forming unit 4 is disposed downstream of the bending deformation member 36.

  As shown in FIGS. 6 and 8, the hem forming unit 4 mainly includes four upper blocks 41 and four lower blocks 42. Each upper block 41 is a block piece extending along the transport direction of the film F. The upstream end and the downstream end of the upper block 41 are supported by the upper support shaft 43, respectively. Specifically, the upper block 41 is supported by the upper support shaft 43 at a predetermined distance in the width direction of the film F as shown in FIG. The upper block 41 has a step (height difference) on the bottom surface. The lower block 42 is also a block piece extending along the transport direction of the film F. The upstream end and the downstream end of the lower block 42 are supported by the lower support shaft 44, respectively. Specifically, the lower block 42 is supported by the lower support shaft 44 with a predetermined distance interval in the width direction of the film F. More specifically, the lower block 42 is provided below the upper block 41 and corresponding to the upper block 41. As shown in FIG. 8, the lower block 42 has a step (level difference) on the upper surface. The step on the upper surface of the lower block 42 is shaped to match the step on the bottom surface of the upper block 41.

  A gap 45 is formed between the upper block 41 and the lower block 42. The film F bent by the bending deformation member 36 is passed through the gap 45. In the film F that has passed through the gap 45, a portion (stepped portion) that is bent in a stepped shape is formed. The stepped portion of film F is then folded. The folded stepped portion is then heated and welded. As a result, the stepped portions become hems H1 to H4.

(2-4) Film Detection Unit The film detection unit 5 is a unit for collecting the position information of the film F. The position information of the film F is information regarding the position (film position) of the end portion in the width direction of the film F as described above. Further, the position information of the film F is also information regarding the deviation of the film F in the width direction of the film F. The bias of the film F is a shift of the width direction center C2 of the film F with respect to the width direction center C1 of the transport path P of the film F. As shown in FIG. 2, the film detection unit 5 is disposed downstream of the hem formation unit 4. That is, the film detection unit 5 detects the position of the end of the film F after the hems H1 to H4 are formed.

  The film detection unit 5 is composed of a plurality of sensors. As shown in FIG. 2, the film detection unit 5 includes first end sensors 51a and 51b and second end sensors 52a and 52b as a plurality of sensors. The first end side sensors 51 a and 51 b and the second end side sensors 52 a and 52 b are arranged in a line along the width direction of the film F.

  The first end sensors 51a and 51b are arranged on the left side in the film F conveyance direction. The first end side sensors 51a and 51b include a first inner sensor 51a and a first outer sensor 51b. The first inner sensor 51 a is located on the inner side in the width direction of the transport path P. The first outer sensor 51b is located on the outer side in the width direction of the transport path P. Each of the first inner sensor 51a and the first outer sensor 51b is a photoelectric sensor. The first inner sensor 51 a and the first outer sensor 51 b detect the film F when light is blocked by the film F.

  On the other hand, the second end side sensors 52a and 52b are arranged on the right side in the transport direction of the film F. The second end side sensors 52a and 52b include a second inner sensor 52a and a second outer sensor 52b. The second inner sensor 52 a is located on the inner side in the width direction of the transport path P. The second outer sensor 52b is located on the outer side in the width direction of the transport path P. The second inner sensor 52a and the second outer sensor 52b are also photoelectric sensors. The second inner sensor 52a and the second outer sensor 52b also detect the film F when light is blocked by the film F.

  In the present embodiment, a state where the sensor detects the film F is referred to as an ON state, and a state where the sensor is not detected is referred to as an OFF state. In the present embodiment, when the position of the film F and the width dimension of the film F are appropriate, the first inner sensor 51a and the second inner sensor 52a are turned on, and the first outer sensor 51b and the second outer sensor Each sensor 51a, 51b, 52a, 52b is arrange | positioned so that 52b may be in an OFF state (refer FIG. 14).

  The film detection unit 5 collects position information of the film F at short time intervals (for example, every 0.1 to 0.5 seconds). The film detection unit 5 sends the collected position information to the control unit 7 every time the position information of the film F is collected.

(2-5) Bag Making and Packaging Unit The bag making and packaging unit 6 is a unit for forming the film F on which the hems H1 to H4 are formed into a bag B. The bag making and packaging unit 6 is arranged downstream of the film detection unit 5 as shown in FIG.

  The bag making and packaging unit 6 mainly includes a forming mechanism 61, a vertical seal mechanism 62, a shutter mechanism 65, a horizontal seal mechanism 63, a gusset forming mechanism 64, and a support frame 11 that supports these mechanisms. ing. A casing 12 is attached around the support frame 11 (see FIG. 1).

(2-5-1) Forming Mechanism The forming mechanism 61 includes a tube 61a and a former 61b. The tube 61a is a rectangular tube-shaped member. The tube 61a extends in the vertical direction and has openings at the upper and lower ends. The tube 61a is fixed to the former 61b via a bracket (not shown). An article C dropping from the computer scale 9 provided above the bag making and packaging unit 6 by a predetermined amount is put into the opening at the upper end of the tube 61a. The computer scale 9 is a combination weighing device including a feeder, a pool hopper, a weighing hopper, a collective discharge chute, and the like. The former 61b is disposed so as to surround the tube 61a. The film F is formed into a rectangular tube shape (square tube film Fc) when passing through the gap between the former 61b and the tube 61a. The tube 61a and the former 61b are replaced according to the size of the bag B to be manufactured.

(2-5-2) Vertical Sealing Mechanism The vertical sealing mechanism 62 heat-seals while pressing a portion of the rectangular tubular film Fc wound around the tube 61a in the vertical direction against the surface of the tube 61a with a constant applied pressure. The vertical seal portion L1 is formed. The vertical seal mechanism 62 includes a heater and a heater belt heated by the heater. The vertical sealing mechanism 62 pressurizes the overlapping portion with a heater belt and heat seals.

(2-5-3) Shutter Mechanism As shown in FIG. 2, the shutter mechanism 65 is below the forming mechanism 61, the vertical seal mechanism 62, and the gusset forming mechanism 64 described later, and is provided for a horizontal seal mechanism 63 described later. It is arranged above. The shutter mechanism 65 is a mechanism that suppresses the biting of the article C into a portion to be sealed formed by a lateral seal mechanism 63 described later, and has a pair of shutter members. The pair of shutter members are disposed in front of and behind the square tubular film Fc. The shutter mechanism 65 prevents the article C from being caught in the sealed portion by repeating the first operation and the second operation. The first operation is an operation in which the shutter member descends a predetermined distance with the square tubular film Fc sandwiched therebetween. The second operation is an operation in which the shutter member moves away from the square tubular film Fc, and further approaches the square tubular film Fc and sandwiches the square tubular film Fc. The shutter member sandwiches the rectangular tubular film Fc earlier than the sealing jaws 63a and 63b of the lateral sealing mechanism 63 described later, and when the rectangular tubular film Fc is laterally sealed, the packaging object falls above the portion to be sealed. Suppress.

(2-5-4) Horizontal Seal Mechanism The horizontal seal mechanism 63 is disposed below the molding mechanism 61, the vertical seal mechanism 62, and the shutter mechanism 65. The lateral seal mechanism 63 is mainly composed of seal jaws 63a and 63b. As shown in FIG. 9, the horizontal sealing mechanism 63 turns the sealing jaws 63a and 63b symmetrically with respect to the center line CO. The rectangular tubular film Fc passes around the center line CO. The sealing jaws 63a and 63b sandwich the rectangular tubular film Fc when they are closest to each other, and form a lateral sealing portion in the rectangular tubular film Fc. Specifically, the upper part of the bag (first bag) manufactured first out of the two bags continuously manufactured by the bag making and packaging machine 1 by one clamping operation by the sealing jaws 63a and 63b. A lateral seal portion T1 and a lower lateral seal portion T2 of a bag (second bag) to be manufactured next are formed at the same time. One sealing jaw 63a has a built-in cutter (not shown), and the center of the portion heat-sealed by one sandwiching operation is cut in the lateral direction by the cutter. By this cutting, the horizontal seal part is separated into the upper horizontal seal part T1 and the lower horizontal seal part T2, and one bag is separated from the rectangular tubular film Fc extending in the vertical direction.

(2-5-5) Gusset forming mechanism The gusset forming mechanism 64 forms the gusset G on the square tubular film Fc. The gusset forming mechanism 64 is disposed below the forming mechanism 61 and above the lateral seal mechanism 63. The gusset forming mechanism 64 mainly includes a spreader 64a, a folding member 64b, and a motor that drives the folding member 64b. As shown in FIG. 2, the spreader 64a is attached to the four corners at the lower end of the tube 61a. The spreader 64a is a thin plate member that extends downward from the lower end of the tube 61a. The thin plate member has a connecting portion and a main body. A connection part is a part connected with the outer edge of the tube 61a. The main body extends below the connecting portion. Specifically, the main body extends downward by a predetermined length on the inner side of the outer edge of the tube 61a. The folding members 64b are arranged on the left and right with the square tubular film Fc as the center. As shown in FIG. 10, the folding member 64 b pivots symmetrically with respect to the central direction (vertical seal portion L <b> 1) of the square tubular film Fc. The folding members 64b sandwich the side surfaces of the rectangular tubular film Fc when they are closest to each other. At this time, as shown in FIG. 11, force is applied to the side surfaces of the rectangular tube-shaped film Fc in the opposite directions by the spreaders 64a and 64a and the folding member 64b. Thereby, the gusset G is formed in the rectangular tube-shaped film Fc.

(2-6) Control Unit The control unit 7 includes a CPU, a ROM, a RAM, a hard disk, and the like, and reads and executes a program for controlling each part of the bag making and packaging machine 1. As shown in FIG. 12, the control unit 7 is connected to a display 8, a film supply unit 2, a film transport mechanism 3, a hem formation unit 4, a film detection unit 5, and a bag making and packaging unit 6. The control unit 7 transmits a control command to each unit and mechanism based on various settings received by the display 8. The drive unit of each unit and mechanism is driven based on a control command sent from the control unit 7. Further, the control unit 7 acquires and stores various information (for example, detection information (detection result) of the film F) from each unit and mechanism at short time intervals. The control unit 7 displays operation information and the like on the display 8 based on the acquired information.

  The control unit 7 stores various information in a hard disk or the like. The various information includes various settings and basic information received by the display 8. The control unit 7 drives the swing unit 35 and the pusher 37 based on the detection information and basic information of the film F. The basic information is information that is referred to when determining whether the position and the width dimension of the film F after the hems H1 to H4 are formed are in a predetermined state. The basic information is information that is referred to when generating a control command to be sent to the swing unit 35 and the pusher 37 when the position and width dimension of the film F are not in a predetermined state. Here, the predetermined state means a state where the position of the film F and the width dimension of the film F are appropriate. In other words, it means a state in which the position of the film F is at an appropriate position and the width dimension of the film F is an appropriate dimension. When the position of the film F and the width dimension of the film F are appropriate, as described above, the first inner sensor 51a and the second inner sensor 52a of the film detection unit 5 are turned on, and the first outer sensor 51b and the second outer sensor 52b are turned off.

  As shown in FIG. 13, the basic information is information relating to the state of the film (states 1 to 9) determined by the combination of the ON / OFF state of each sensor. Specifically, the basic information includes a plurality of film states and a combination of sensor states for determining the state of each film. The state of the plurality of films is defined by the film position and the width dimension of the film, respectively. For example, when the first outer sensor 51b and the second outer sensor 52b are OFF and the first inner sensor 51a and the second inner sensor 52a are ON, the control unit 7 sets the state of the film F to the first state. Is determined. For example, when the first outer sensor 51b and the first inner sensor 51a are ON and the second inner sensor 52a and the second outer sensor 52b are OFF, the control unit 7 changes the state of the film F to the fourth state. Judge that there is. The control unit 7 generates a control command corresponding to the state of the film F and sends it to the swing unit 35 or the pusher 37. Control of the swing unit 35 and the pusher 37 will be described later.

(3) Operation of the bag making and packaging machine (3-1) Overall flow When the film transport mechanism 3 is driven, the film F is fed out from the film roll FR. As shown in FIGS. 2 and 3, the film F spans the gap 45 of the hem forming unit 4 in a state where it is stretched over the plurality of guide rollers 31, the dancer roller 34, the swing roller 351, and the bending deformation member 36. Passed. On the film F that has passed through the hem forming unit 4, hems H1 to H4 are formed. Thereafter, the film F is sent to the bag making and packaging unit 6. The film F passes through the forming mechanism 61 and is formed into a square tubular film Fc. Thereafter, the vertical sealing mechanism 62 heat-seals the overlapping portions of the rectangular tubular film Fc. Thereafter, the gusset G is formed on the rectangular tubular film Fc by the gusset forming mechanism 64 and the rectangular tubular film Fc is laterally sealed by the lateral sealing mechanism 63. Thereafter, the laterally sealed portion is cut by a cutter, and the bag B is cut off from the upstream rectangular tubular film Fc.

(3-2) Control of Swing Unit and Pusher The control unit 7 swings based on the basic information (see FIG. 13) and the position information (detection result) of the film F acquired by the film detection unit 5. Control commands for the unit 35 and the pusher 37 are generated. The swing unit 35 and the pusher 37 are driven based on a control command. Hereinafter, control of the swing unit 35 and the pusher 37 will be described with reference to FIGS. 14 to 19, the sensors indicated by hatching are sensors in the ON state.

(3-2-1) When both the film position and the film width dimension are appropriate FIG. 14 shows an example where both the film position and the film width dimension are appropriate. When the film position is appropriate (or appropriate position), the width direction center C2 of the film F and the width direction center C1 of the transport path P coincide with each other, or the width direction center C2 of the film F and the transport path This means that the deviation of P from the center C1 in the width direction is within an appropriate range. Moreover, that the width dimension of a film is suitable (or appropriate width dimension) means that the width dimension of hems H1-H4 is the appropriate width dimension w1.

  As shown in FIG. 14, when the film position is an appropriate position and the width dimension of the film is the appropriate width dimension d1, both the first inner sensor 51a and the second inner sensor 52a detect the film F, Both the first outer sensor 51b and the second outer sensor 52b do not detect the film F. In other words, the states of the first inner sensor 51a and the second inner sensor 52a are ON, and the states of the first outer sensor 51b and the second outer sensor 52b are OFF. That is, the left end of the film F is between the first inner sensor 51a and the first outer sensor 51b and the right end of the film F is the second inner sensor 52a and the second outer sensor 52b in the conveyance direction of the film F. Between. This state coincides with the first state of the basic information shown in FIG. Therefore, the control unit 7 maintains the current state. That is, the control unit 7 does not generate a control command for the swing unit 35 and the pusher 37.

(3-2-2) When the film position is appropriate and the width dimension of the film is small FIG. 15 shows a case where the film position is an appropriate position and the width dimension of the film is smaller than the appropriate width dimension d1. An example is given. The case where the width dimension of the film is small is, for example, the case where the width dimension w2 of the hems H1 to H4 is larger than the appropriate width dimension w1 of the hems H1 to H4 (w2> w1).

  As shown in FIG. 15, when the film position is appropriate and the width of the film is small, the first inner sensor 51a, the first outer sensor 51b, the second inner sensor 52a, and the second outer sensor 52b All do not detect film F. In other words, all the states of the first inner sensor 51a, the first outer sensor 51b, the second inner sensor 52a, and the second outer sensor 52b are OFF. That is, the left end of the film F is closer to the center in the width direction than the first inner sensor 51a, and the right end of the film F is closer to the center in the width direction than the second inner sensor 52a. This state coincides with the second state of the basic information shown in FIG. Therefore, the control unit 7 generates a control command for swinging the swing unit 35 in an acute angle direction. Thereby, the tension | tensile_strength of the width direction center part of the film F reduces, and the tension | tensile_strength of the width direction edge part of the film F increases. As a result, the width dimension w2 of the hems H1 to H4 becomes smaller, and the width dimension of the film F after the hems H1 to H4 are formed becomes larger than the width dimension d2 of the film F before driving the swing unit 34. .

(3-2-3) When the film position is appropriate and the width dimension of the film is large FIG. 16 shows that the film position is appropriate and the width dimension of the film is a width dimension d3 larger than the appropriate width dimension d1. An example of the case is shown. A case where the width dimension of the film is large is, for example, a case where the width dimension w3 of the hems H1 to H4 is smaller than the appropriate width dimension w1 of the hems H1 to H4 (w3 <w1).

  As shown in FIG. 16, when the film position is appropriate and the film width dimension is large, all of the first inner sensor 51a, the first outer sensor 51b, the second inner sensor 52a, and the second outer sensor 52b are used. Detects film F. In other words, all the states of the first inner sensor 51a, the first outer sensor 51b, the second inner sensor 52a, and the second outer sensor 52b are ON. That is, the left end of the film F is on the outer side in the width direction than the first outer sensor 51b, and the right end of the film F is on the outer side in the width direction with respect to the second outer sensor 52b. This state coincides with the third state of the basic information shown in FIG. Therefore, the control unit 7 generates a control command for swinging the swing unit 35 in the obtuse angle direction. Thereby, the tension | tensile_strength of the width direction edge part of the film F reduces, and the tension | tensile_strength of the width direction center part of the film F increases. As a result, the width dimension w3 of the hems H1 to H4 is increased, and the width dimension of the film F after the hems H1 to H4 are formed is smaller than the width dimension d3 of the film F before the swing unit 34 is driven. .

(3-2-4) When the width dimension of the film is appropriate and the film is biased FIG. 17 shows that the width dimension of the film F is the appropriate width dimension d1 and the film F is on one side in the width direction. An example of bias is shown. The case where the film F is biased to one side in the width direction refers to the case where the width direction center C2 of the film F is deviated from the width direction center C1 of the transport path P. As shown in FIG. 17, when the film F is biased to one side in the width direction, the sensor disposed in the same direction as the direction in which the film F is biased detects the film F.

  FIG. 17 shows a case where the width direction center C2 of the film F is biased to the left side in the transport direction. Accordingly, the first inner sensor 51a and the first outer sensor 51b detect the film F, and the second inner sensor 52a and the second outer sensor 52b do not detect the film F. In other words, the states of the first inner sensor 51a and the first outer sensor 51b are ON, and the states of the second inner sensor 52a and the second outer sensor 52b are OFF. This state coincides with the fourth state of the basic information shown in FIG. Therefore, the control unit 7 controls to drive the pusher (here, the first pusher 37a) arranged in the same direction (right side) as the direction (right side) in which the width direction center C2 of the film F is to be moved. Generate directives.

  On the other hand, when the center C2 in the width direction of the film F is biased to the right side in the transport direction, a sensor different from the sensor indicating ON in FIG. That is, the film detection unit 5 detects the state of the sensor that matches the fifth state of FIG. Therefore, the control unit 7 generates a control command for driving the second pusher 37b in order to move the center position of the film F to the left.

  Thereby, the film F moves so that the width direction center C2 of the film F coincides with the width direction center C1 of the transport path P.

(3-2-5) When the width dimension of the film is small and the film is biased FIG. 18 shows that the width dimension of the film is a width dimension d2 smaller than the appropriate width dimension d1 and the film F is skewed. An example is shown. As shown in FIG. 18, when the width dimension of the film F is small and the width direction center C2 of the film F does not coincide with the width direction center C1 of the transport path P, the same direction as the direction in which the film F is biased. Among the sensors arranged in the, only the sensor arranged on the inner side in the width direction of the conveyance path P detects the film F, and the other sensors do not detect the film F.

  FIG. 18 illustrates a case where the width direction center C2 of the film F is biased to the left side in the transport direction. Of the four sensors 51a, 51b, 52a, 52b, only the first inner sensor 51a detects the film F, and the other sensors 51b, 52a, 52b do not detect the film F. In other words, the state of the first inner sensor 51a is ON, and the states of the other sensors 51b, 52a, 52b are OFF. This state coincides with the sixth state of the basic information shown in FIG. Therefore, the control unit 7 controls the pusher (here, the first pusher 37a) disposed on the same side (right side) as the moving direction (right direction) of the width direction center C2 of the film F. Is generated. Further, the control unit 7 generates a control command for moving the swing unit 35 in an acute angle direction.

  On the other hand, when the center C2 in the width direction of the film F is biased to the right side in the transport direction, a sensor different from the sensor indicating ON in FIG. That is, the film detection unit 5 detects the state of the sensor that matches the seventh state of FIG. Therefore, the control unit 7 generates a control command for driving the second pusher 37b in order to move the center position of the film F to the left. Further, the control unit 7 generates a control command for moving the swing unit 35 in an acute angle direction.

  Thereby, the film F moves so that the width direction center C2 of the film F coincides with the width direction center C1 of the transport path P. Furthermore, the tension at the center in the width direction of the film F decreases, and the tension at the end in the width direction of the film F increases. As a result, the width dimension of the hems H1 to H4 is smaller than w2, and the width dimension of the film F after the hems H1 to H4 are formed is larger than the width dimension d2 of the film F before driving the swing unit 34. Also grows.

(3-2-6) When the width dimension of the film is large and the film is biased FIG. 19 shows that the width dimension of the film is a width dimension d3 larger than the appropriate width dimension d1 and the film F is skewed. An example is shown. As shown in FIG. 19, when the width dimension of the film is large and the width direction center C <b> 2 of the film F does not coincide with the width direction center C <b> 1 of the transport path P, the film F is disposed in a direction opposite to the direction in which the film F is biased. Among the sensors that have been used, only the sensor disposed outside in the width direction of the conveyance path P does not detect the film F, and all other sensors detect the film F.

  FIG. 19 shows a case where the width direction center C2 of the film F is biased to the left side in the transport direction. Of the four sensors 51a, 51b, 52a, 52b, only the second outer sensor 52b does not detect the film F, and the other sensors 51a, 51b, 52a detect the film F. In other words, the state of the second outer sensor 52b is OFF, and the states of the other sensors 51a, 51b, 52a are ON. This state coincides with the eighth state of the basic information shown in FIG. Therefore, the control unit 7 controls the pusher (here, the first pusher 37a) disposed on the same side (right side) as the moving direction (right direction) of the width direction center C2 of the film F. Is generated. Furthermore, the control unit 7 generates a control command for moving the swing unit 35 in the obtuse angle direction.

  On the other hand, when the center C2 in the width direction of the film F is biased to the right side in the transport direction, a sensor different from the sensor indicating ON in FIG. That is, the film detection unit 5 detects the state of the sensor that matches the ninth state of FIG. Therefore, the control unit 7 generates a control command for driving the second pusher 37b in order to move the center position of the film F to the left. Furthermore, the control unit 7 generates a control command for moving the swing unit 35 in the obtuse angle direction.

  Thereby, the film F moves so that the width direction center C2 of the film F coincides with the width direction center C1 of the transport path P. Further, the tension at the end in the width direction of the film F decreases, and the tension at the center in the width direction of the film F increases. As a result, the width dimension of the hems H1 to H4 becomes larger than w3, and the width dimension of the film F after the hems H1 to H4 are formed is the width dimension d3 of the film F before driving the swing unit 34. Smaller than.

(3-3) Flow of Control Next, the flow of control of the swing unit 35 and the pusher 37 will be described with reference to FIG. In step S1, the position information of the film F is acquired by the film detection unit 5 and further stored.

  In step S2, it is determined whether or not the position information has changed. In step S2, the process waits until there is a change in position information. If there is a change in position information, the process proceeds to step S3.

  In step S3, it is determined whether or not the film position is appropriate. Specifically, it is determined whether or not the first end side sensors 51a and 51b and the second end side sensors 52a and 52b respectively arranged on both sides of the transport path P show the same state. Specifically, the following three states can be considered. The first state is a state where both the second end side sensors 52a and 52b detect the film F when both the first end side sensors 51a and 51b detect the film F. The second state is a state in which both the second end sensors 52a and 52b do not detect the film F when both the first end sensors 51a and 51b do not detect the film F. The third state is that when only the first inner sensor 51a of the first end sensors 51a and 51b detects the film F, only the second inner sensor 52a of the second end sensors 52a and 52b is detected. In this state, the film F is detected. If the film position is appropriate in step S3, the process proceeds to step S6. On the other hand, if the film position is not appropriate in step S3, the process proceeds to step S4.

  In step S4, a command for driving the pusher 37 is generated. The command is a command for driving the pusher 37 for a predetermined time. Here, the predetermined time is one time length selected from a plurality of preset time lengths.

  Then, it progresses to step S5 and it is determined again whether a film position is suitable. In step S5, when the film position is not appropriate, the pusher 37 is driven until the film position becomes an appropriate position. At this time, the control unit 7 changes the length of time for which the pusher 37 is driven according to the number of times the pusher 37 is driven. Specifically, the control unit 7 selects a gradually longer time from a plurality of preset time lengths according to the number of times the pusher 37 is driven until an arbitrary number of times is reached. The pusher 37 is driven according to the selected time length. If the film position is appropriate in step S5, the process proceeds to step S6.

  In step S6, a command for driving the swing unit 35 is generated. The command is a command for rotating the swing unit 35 by a predetermined angle. Then, it returns to step S1.

(4) Features (4-1)
The bag making and packaging machine 1 according to the present embodiment can adjust the transport state of the film by the film transport mechanism 3, so that the hems H <b> 1 to H <b> 4 can be reliably formed. When a bag with hem is manufactured using a bag making and packaging machine, hem is formed on the film F in a route until the film supplied from the film supply unit is sent to the bag making and packaging unit. The film F is conveyed while being tensioned by a plurality of rollers in order to reduce the occurrence of meandering and wrinkles during conveyance. However, when hem is formed on the film, depending on the state of the film sent to the hem forming unit (degree of film deflection or degree of deviation of the width direction center C2 of the film F with respect to the width direction center C1 of the transport path P). , Hems H1 to H4 may not be formed properly.

  However, the bag making and packaging machine 1 according to the present embodiment detects the film F after the hems H1 to H4 are formed, and determines the width dimension of the film F. Further, based on the determination result, the film transport mechanism 3 changes the tension of at least a part of the film F transported to the hem forming unit. Therefore, since the state of the film F sent to the hem forming unit is appropriately corrected, hem can be stably formed.

(4-2)
In the bag making and packaging machine 1 according to the present embodiment, the film F folded back by the bending deformation member 36 is sent to the hem forming unit 4 in a curved state. Further, when the swing unit 35 is driven, the tension in the width direction of the film F that contacts the bending deformation member 36 is changed. Specifically, the folding angle θ is changed by driving the swing unit 35, and each portion of the film F in the width direction comes into contact with the curved edge 36 a with a different tension. When the folding angle θ varies in the acute angle direction, the tension at the center in the width direction of the film F decreases and the tension at the end in the width direction of the film F increases. As a result, the width dimension of the hems H1 to H4 formed on the film F is reduced, and the width dimension of the film F after the hems H1 to H4 are formed is increased. On the other hand, when the folding angle θ varies in the obtuse angle direction, the tension at the widthwise end of the film F decreases and the tension at the widthwise center of the film F increases. As a result, the width dimension of the hems H1 to H4 formed on the film F is increased, and the width dimension of the film F after the hems H1 to H4 are formed is decreased. As described above, the swing unit 35 is appropriately driven based on the film position information acquired after the hems H1 to H4 are formed. Therefore, the width dimensions of the hems H1 to H4 formed on the film F can also be adjusted or corrected as appropriate.

  If the width of the hems H1 to H4 is too small outside the appropriate range, the hems H1 to H4 may not be well maintained or the hems H1 to H4 may not be formed appropriately. On the other hand, if the width dimension of the hems H1 to H4 is too large outside the appropriate range, the width dimension of the part of the film F that is vertically sealed by the vertical sealing mechanism 62 (the part where the film F is overlapped) becomes small. As a result, the rectangular tubular film Fc cannot be reliably vertically sealed, and the performance of the bag B is deteriorated. However, since the bag making packaging machine 1 which concerns on the said embodiment can adjust or correct the width dimension of hems H1-H4 formed in the film F suitably, it ensures the performance of the bag B manufactured as a result. be able to.

(4-3)
The bag making and packaging machine 1 according to this embodiment includes a pusher 37. The pusher 37 prevents the film F from meandering by pressing the end of the film F in the width direction. Further, in the bag making and packaging machine 1 according to the present embodiment, the position information of the film F after the hems H1 to H4 are formed on the first pusher 37a and the second pusher 37b arranged on both sides in the width direction of the conveyance path P. Drive based on. Specifically, when the position C2 in the width direction of the film F is deviated to the left or right in the width direction of the transport path P, the first pusher 37a and the second pusher 37b are corrected so as to correct the deviation of the film F. Either one is driven.

  When the width direction center C2 of the film F is shifted from the width direction center C1 of the transport path P, the positions of the hems H1 to H4 formed on the film F are also shifted. When the positions of the hems H1 to H4 in the film F are shifted, the shape of the bag B that is finally manufactured also collapses. That is, when the hems H1 to H4 are not formed at appropriate positions in the film F, a good bag B may not be manufactured.

  However, the bag making and packaging machine 1 according to the present embodiment appropriately acquires the position information of the film F and adjusts the conveyance state of the subsequent film F. Thereby, since hems H1-H4 are formed in the film F of a predetermined conveyance state, the favorable bag B can be manufactured.

(5) Modification (5-1) Modification A
In the above embodiment, the conveyance angle and the folding angle θ of the film F are changed by driving the swing unit 35. At this time, the oscillating unit 35 caused the oscillating mechanism 352 to change the position (height position and horizontal position) of the oscillating roller 351 in the vertical direction and the horizontal direction. That is, the film transport mechanism 3 according to the above embodiment changed the transport angle and the folding angle θ by changing both the height position and the horizontal position of the swing roller 351. Here, the conveyance angle and the folding angle θ of the film F may be changed by changing either the height position or the horizontal position of the swing roller 351. That is, instead of the swinging mechanism 352, a moving mechanism for changing either the height position or the horizontal position of the roller 351 may be provided.

(5-2) Modification B
Further, the conveyance angle and the folding angle θ of the film F may be changed by changing the inclination of the bending deformation member 36 instead of the swing unit 35. That is, the bending deformation member 36 is supported by the swing mechanism 36c as shown in FIG. The swing unit 35 of the above embodiment is changed to the guide roller 31. The swing mechanism 36c swings the bending deformation member 36 in the direction indicated by the arrow R2. That is, the swing mechanism 36c supports the bending deformation member 36 so that the inclination of the bending deformation member 36 with respect to the horizontal plane can be changed. By changing the inclination of the bending deformation member 36, the inclination (folding angle) θ of the conveyance surface CS2 with respect to the conveyance surface CS1 changes, and each portion in the width direction of the film F contacts the curved edge 36a with different tension. . Also by this, the width dimension of hems H1-H4 formed in the film F can be adjusted or corrected suitably.

(5-3) Modification C
In the above embodiment, the driving time of the pusher 37 is selected in a stepwise manner from a plurality of preset time lengths. Here, the drive time of the pusher 37 may be any one short time length.

(5-4) Modification D
In the above embodiment, the pusher 37 and the swing unit 35 are driven based on the position information acquired by the common film detection unit 5. Here, a plurality of film detection units 5 may be installed, and the pusher 37 and the swing unit 35 may be driven based on position information of different position detection units.

(5-5) Modification E
In the above embodiment, the pusher 37 is disposed in the film F conveyance path from the swing unit 35 to the bending deformation member 36, but the place where the pusher 37 is disposed is immediately after contacting the curved edge 36a. Also good.

(5-6) Modification F
In the above embodiment, the pusher 37 is constituted by the first pusher 37a and the second pusher 37b arranged on both sides in the width direction of the transport path P. Here, the pusher 37 may be disposed on one side of the conveyance path P in the width direction. At this time, a guide may be provided on one side where the pusher 37 is not disposed. The guide is a member that suppresses the film F from moving outward in the width direction of the transport path P. Also by this, the position of the film F can be adjusted.

(5-7) Modification G
The bag which the bag making packaging machine 1 which concerns on the said embodiment manufactures is not restricted to the shape shown in FIG. For example, the bag may have a bottom surface portion and a shape capable of being self-supporting with the bottom surface portion serving as a support surface. In that case, the bag making and packaging unit 6 further has a bottom forming mechanism. That is, the bag making and packaging machine 1 according to the above embodiment uses the film transport mechanism 3 for forming hems that forms hems H1 to H4 on the film F in the middle of transporting the film F to the bag making and packaging unit 6. Any shape of bag may be formed.

(5-8) Modification H
In the control flow of the above embodiment (see FIG. 20), after the swing unit 35 is driven in step S6, the process returns to step S1, but after step S6, it is determined whether or not the film width is appropriate. And the swing unit 35 may be driven until the film width becomes appropriate.

DESCRIPTION OF SYMBOLS 1 Bag making packaging machine 2 Film supply unit 3 Film conveyance mechanism 4 Heme formation unit 5 Film detection unit (detection part)
6 Bag making and packaging unit 7 Control unit 31 Guide roller 32 Pull-down belt 33 Tension adjustment mechanism (tension adjustment unit)
34 Dancer roller 35 Swing unit 351 Swing roller 352 Swing mechanism (support mechanism)
36 Curved deformation member (folding member)
36a Curved edge 36b Curved surface 37 Pusher (pressing member)
36c Oscillation mechanism (support mechanism)
37a First pusher 37b Second pusher 371 Contact surface (first member / second member)
372 cylinder (drive unit)

JP 2010-105740 A

Claims (10)

A transport section for transporting the film;
A hem forming section for forming hem on the film along a conveying direction;
A detection unit for detecting the width dimension of the film after the hem is formed;
Based on the detection result by the detection unit, a tension adjustment unit that changes the tension of at least a part of the film conveyed to the hem formation unit;
Comprising
Heme forming film transport mechanism. A dancer roller that is arranged upstream of the hem forming portion and adjusts the overall tension of the film;
The conveyance mechanism of the film for hem formation of Claim 1. The tension adjusting unit is a member disposed on the upstream side of the hem forming unit, and includes a folding member that is the member that folds the film conveyed by the conveying unit and further curves the film.
A transport mechanism for a film for forming a hem according to claim 1 or 2. The tension adjusting unit changes the tension in the width direction center of the film or the width direction end of the film by changing the transport angle of the film transported to the folding member.
A transport mechanism for the hem-forming film according to claim 3. When the width dimension of the film is smaller than a predetermined dimension, the tension adjusting unit varies the transport angle of the film transported to the folding member in an acute angle direction, and the width dimension of the film is the predetermined dimension. If larger, the conveyance angle of the film conveyed to the folding member is changed in the obtuse angle direction,
A transport mechanism for a film for forming a hem according to claim 4. The tension adjusting unit is
A roller disposed upstream of the folding member;
A support mechanism for supporting the roller so that at least one of a horizontal position and a height position of the roller can be varied;
Further comprising
The support mechanism changes a transport angle of the film transported to the folding member by changing at least one of the horizontal position and the height position of the roller.
A transport mechanism for a film for forming a hem according to claim 5. The tension adjusting unit is
A support mechanism for supporting the folding member so that the inclination of the folding member with respect to a horizontal plane can be varied;
The support mechanism changes a conveyance angle of the film conveyed to the folding member by changing an inclination of the folding member with respect to a horizontal plane.
A transport mechanism for a film for forming a hem according to claim 5 or 6. A pressing member that is disposed on at least one side in the width direction of the film in the path from the tension adjusting unit to the hem forming unit, and that presses an end of the film based on the detection result by the detection unit;
A transport mechanism for a film for forming a hem according to any one of claims 3 to 7. The detection result includes information on the bias of the film in the width direction of the film,
The pressing member is
A first member for pressing the width direction first end of the film;
A second member for pressing a second end which is an end on the opposite side of the film with respect to the first end;
A drive unit that drives the first member and the second member;
The drive unit drives the second member when the detection unit detects a deviation of the film toward the first end, and the detection unit moves the second member toward the second end. When the bias of the film is detected, the first member is driven.
The transport mechanism for a film for forming a hem according to claim 8. A transport mechanism for a film for forming a hem according to any one of claims 1 to 9,
A first sealing mechanism for heat-sealing both widthwise ends of the film on which the hem is formed;
A second sealing mechanism for manufacturing a bag in which an object to be packaged is manufactured by heat-sealing the film sealed by the first sealing mechanism in a direction intersecting a conveyance direction of the film;
Comprising
Bag making and packaging machine.