JP2011230782A - Bag-making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag-making and packaging machine favorably keeping a conveyance condition of a film even when dancer rollers cannot be arranged between a former and a conveyance belt.SOLUTION: The bag-making and packaging machine includes a film supply mechanism 11, the dancer rollers 12, 13, the former 15, a first conveyance mechanism 14, a second conveyance mechanism 16, a control part, and seal mechanisms 17, 18. The first conveyance mechanism is arranged downstream in a conveyance direction of a sheet-like film relative to the dancer rollers, and moreover, upstream in the conveyance direction of the sheet-like film relative to the former. The second conveyance mechanism is arranged adjacently to the former, and it conveys a tubular film at a speed faster than that of the first conveyance mechanism. The control part controls the driving parts of the respective conveyance mechanisms independently, thereby varying a conveyance condition of the film between the first conveyance mechanism and the second conveyance mechanism.

Description

  The present invention relates to a bag making and packaging machine.

  Conventionally, a bag making and packaging machine that forms a sheet-like film into a tubular film and further forms the tubular film into a bag and fills the inside of the bag with a packaged article such as confectionery to make the bag. Are known. Further, for example, in a bag making and packaging machine as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2008-168931), a sheet-like film wound around a film roll is sent to a former and formed into a cylindrical shape. Pulled downstream by two pull-down belts. The two pull-down belts are arranged on both sides of the tubular film, and are usually adjusted to a pinching pressure corresponding to the width of the tubular film. The sheet-like film is conveyed in the downstream direction by driving the two pull-down belts.

  By the way, in consideration of the labor involved in adjusting the pinching pressure, a bag making and packaging machine that transports a tubular film in the downstream direction by a single pull-down belt (second transport mechanism) has also been proposed. In this case, in order to compensate for the reduction of the pull-down force due to the decrease in the number of pull-down belts, it is conceivable to separately provide a transport belt (first transport mechanism) in front of the former.

  Here, in order to keep the conveyance state of a film favorable, in the general bag making packaging machine, the dancer roller is arrange | positioned downstream of the conveyance direction of the film with respect to the film roll. However, if a conveyor belt is provided in front of the former, it is difficult to dispose a dancer roller between the former and the conveyor belt.

  The subject of this invention is providing the bag making packaging machine which makes it possible to maintain the conveyance state of a film favorable, even when a dancer roller cannot be arrange | positioned between a former | foamer and a conveyance belt.

  The bag making and packaging machine according to the present invention includes a film supply mechanism, a dancer roller, a former, a first transport mechanism, a second transport mechanism, a control unit, and a seal mechanism. The film supply mechanism supplies a sheet film. The dancer roller moves according to the conveyance state of the sheet-like film. The former deforms the sheet film into a cylindrical film. The first transport mechanism is driven by the first driving unit to transport the sheet-like film. The first transport mechanism is disposed downstream of the dancer roller in the transport direction of the sheet film and upstream of the former in the transport direction of the sheet film. The second transport mechanism is disposed adjacent to the former. The second transport mechanism is driven by the second drive unit and transports the cylindrical film at a speed higher than that of the first transport mechanism. A control part changes the conveyance state of the film between a 1st conveyance mechanism and a 2nd conveyance mechanism by controlling a 1st drive part and a 2nd drive part each independently. The sealing mechanism seals the tubular film to form a bag.

  Thereby, even when a dancer roller cannot be arranged between the former and the first transport mechanism, the film transport state between the first transport mechanism and the second transport mechanism can be kept good.

  Further, it is preferable that the control unit drives and stops the first drive unit and the second drive unit at different timings to change the tension state of the sheet-like film between the first transport mechanism and the former. Thereby, the tension state of a sheet-like film can be changed, without changing the drive speed of each drive mechanism.

  Moreover, it is preferable that a control part stops a 2nd drive part prior to a 1st drive part. Thereby, since the 1st drive part conveys a sheet-like film downstream after the 2nd drive part stops, it can sag a sheet-like film upstream in the conveyance direction to a former.

  Furthermore, it is preferable that the control unit drives the second drive unit before the first drive unit. Thereby, since the 2nd conveyance mechanism conveys a sheet-like film downstream earlier than the 1st conveyance mechanism, tension can be given again to the sheet-like film which slackened in the conveyance direction of the film to the former. .

  Moreover, it is preferable that a 1st conveyance mechanism contains the 1st vacuum which always attracts | sucks a sheet-like film. Thereby, since the film in contact with the first transport mechanism is sucked while the first transport mechanism is stopped, the tension state of the sheet-like film between the first transport mechanism and the former is changed. Moreover, the shift | offset | difference of a sheet-like film can be suppressed.

  The bag making and packaging machine according to the present invention maintains a good film conveyance state between the first conveyance mechanism and the second conveyance mechanism even when a dancer roller cannot be disposed between the former and the first conveyance mechanism. be able to.

It is an external appearance perspective view of a bag making packaging machine. It is a schematic perspective view of the principal part of a bag making packaging machine. It is a top view of a 1st conveyance mechanism. It is a perspective view of a 1st conveyance mechanism. It is a control block diagram. It is the control flow of the drive / stop regarding a 1st drive motor and a 2nd drive motor. It is a figure which shows the drive speed and drive / stop timing of a 1st drive motor and a 2nd drive motor. It is a figure which shows the drive speed and drive / stop timing of the 1st drive motor which concerns on the modification 2, and a 2nd drive motor. It is a figure which shows the drive speed and drive / stop timing of the 1st drive motor which concerns on the modification 3, and a 2nd drive motor. It is a figure which shows the drive speed and drive / stop timing of the 1st drive motor which concerns on the modification 3, and a 2nd drive motor.

  A bag making and packaging machine 10 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, “upstream” and “downstream” mean directions based on the direction in which the sheet-like film Fs and the tubular film Fc are conveyed.

(1) Overall Configuration FIG. 1 shows an external perspective view of a bag making and packaging machine 10 according to an embodiment of the present invention. In FIG. 2, the schematic perspective view of the principal part of the bag making packaging machine 10 is shown. The bag making and packaging machine 10 is a machine for bagging articles such as potato chips to be packaged to produce a bag-packed product (bag) 30. The article C to be packaged by the bag making and packaging machine 10 is supplied by a combination weighing unit 80 disposed above the bag making and packaging machine 10. The combination weighing unit 80 weighs the article C and supplies an aggregate of articles C having a predetermined weight to the bag making and packaging machine 10.

  As shown in FIG. 2, the bag making and packaging machine 10 mainly includes a film supply mechanism 11, a first transport mechanism 14, a former 15, a second transport mechanism 16, a vertical seal mechanism 17, and a horizontal seal mechanism 18. With.

  The film supply mechanism 11 supplies the sheet-like film Fs wound around the film roll Fr to a mechanism disposed downstream. The sheet-like film Fs fed out from the film roll Fr is sent to the first transport mechanism 14. The first transport mechanism 14 transports the sheet film Fs in the horizontal direction. The sheet-like film Fs conveyed by the first conveyance mechanism 14 is guided to the former 15 and formed into a cylindrical film Fc. The second transport mechanism 16 transports the tubular film Fc in the vertical direction. The vertical sealing mechanism 17 vertically seals the tubular film Fc. The horizontal sealing mechanism 18 performs horizontal sealing on the upper and lower sides of the vertically sealed tubular film Fc in accordance with the timing when the article is supplied from the combination weighing unit 80, and forms an upper seal portion and a lower seal portion on the tubular film Fc. To do.

  Moreover, the bag making packaging machine 10 is provided with the operation switch 91 and the operation display 92, as shown in FIG. The operation switch 91 is used for performing various operations. The operation display 92 is provided at a position where a user operating the operation switch 91 can visually recognize the operation state. The operation display 92 is a touch panel display, and is also used for various settings. Further, the bag making and packaging machine 10 includes a storage unit 93 and a control unit 94. The memory | storage part 93 memorize | stores various data, such as a program for driving said each mechanism. The storage unit 93 stores various data input by operating the operation switch 91. The control unit 94 drives each of the mechanisms based on various data stored in the storage unit 93.

(2) Detailed configuration (2-1) Film supply mechanism 11
The film supply mechanism 11 is a mechanism that supplies the sheet-like film Fs to each mechanism disposed downstream. The film supply mechanism 11 is mainly composed of an air shaft 111, a shaft drive motor (not shown), and a plurality of tension rollers 12 and 13.

  A film roll Fr around which a sheet-like film Fs is wound is set on the air shaft 111. The air shaft 111 vacuum-sucks the film roll Fr.

  The shaft drive motor rotates the air shaft 111. When the shaft drive motor rotates the air shaft 111, the sheet-like film Fs wound around the film roll Fr is fed out.

  The plurality of tension rollers 12 and 13 are rollers arranged at a predetermined distance interval. The sheet-like film Fs fed out from the film roll Fr is sent to the first transport mechanism 14 via the plurality of tension rollers 12 and 13. The plurality of tension rollers 12 and 13 include a roller (not shown). The tension rollers 12 and 13 guide the sheet film Fs to the first transport mechanism 14 while bending the sheet film Fs fed from the film roll Fr and changing the transport angle.

  Of the plurality of tension rollers 12 and 13, the tension roller 12 is a dancer roller. The tension roller 12 is configured to be movable in the vertical direction, and the tension state of the sheet-like film Fs is detected based on the amount of displacement of the tension roller 12 in the vertical direction. Based on the tension state detected here, the air shaft 111 is driven so as to keep the tension of the sheet-like film Fs within a predetermined range. Thereby, loosening and meandering of the sheet-like film Fs being conveyed are prevented.

(2-2) First Transport Mechanism FIGS. 3 and 4 show the first transport mechanism 14. The first transport mechanism 14 is disposed downstream of the tension rollers 12 and 13 in the transport direction of the sheet film Fs. The first transport mechanism 14 is disposed upstream of the former 15 in the transport direction of the sheet film Fs. The first transport mechanism 14 sucks and transports the sheet-like film Fs supplied by the film supply mechanism 11 toward the former 15.

  Moreover, the 1st conveyance mechanism 14 is arrange | positioned under the sheet-like film Fs conveyed in a horizontal direction, and the width direction center of the sheet-like film Fs. The first transport mechanism 14 is attached to the support frame 81 via the attachment mechanism 41. The attachment mechanism 41 allows the first transport mechanism 14 to slide with respect to the support frame 81, and further allows the first transport mechanism 14 to move in the width direction of the support frame 81.

  As shown in FIG. 3, the first transport mechanism 14 mainly includes a first belt 42, a first intake pipe 43, a first drive roller 44, a first driven roller 45, and a first drive motor 46. The 1st belt 42 is arrange | positioned along the conveyance direction of the sheet-like film Fs. The first belt 42 has a plurality of suction holes 421. The first intake pipe 43 always generates a negative pressure. The first belt 42 always sucks the sheet film Fs through the suction hole 421 by the negative pressure generated by the first intake pipe 43. The first drive roller 44 is driven and rotated by the first drive motor 46. The first driven roller 45 rotates according to the rotation of the first drive roller 44. The first drive motor 46 is a servo motor. The first drive motor 46 is driven or stopped in conjunction with the operation of the lateral seal mechanism 18. The first drive motor 46 is controlled by a control unit 94 described later.

  An optical sensor 47 is disposed in the vicinity of the first transport mechanism 14. The optical sensor 47 includes a light emitting sensor and a light receiving sensor. The optical sensor 47 irradiates the detected part with light. Further, the optical sensor 47 detects the position of the detected part and the presence or absence of the deviation of the detected part by detecting the reflected light. For example, an edge of the sheet-like film Fs or a printed date portion can be set as the detected portion. That is, the presence or absence of meandering of the sheet-like film Fs is grasped by the optical sensor.

(2-3) Former The former 15 transforms the sheet film Fs transported by the first transport mechanism 14 into a tubular film Fc. The former 15 is disposed downstream of the first transport mechanism 14 in the transport direction of the sheet film Fs. The former 15 mainly includes a tube 51 and a sailor 52.

  The tube 51 is a cylindrical member extending up and down, and has openings at the upper and lower ends. From the opening at the upper end of the tube 51, the article C such as potato chips supplied from the combination weighing unit 80 is put.

  The sailor 52 is arranged on the upper end side of the tube 51 so as to surround the tube 51. The shape of the sailor 52 is such that the sheet-like film Fs fed from the film roll Fr is formed into a cylindrical shape when passing between the sailor 52 and the tube 51. In addition, the tube 51 and the sailor 52 are replaced | exchanged according to the magnitude | size of the bag to manufacture.

(2-4) Second transport mechanism The second transport mechanism 16 is a pull-down belt. The second transport mechanism 16 transports the cylindrical film Fc wound around the tube 51 downward while adsorbing it. The second transport mechanism 16 transports the tubular film Fc at a slightly higher speed than the first transport mechanism 14.

  The second transport mechanism 16 is disposed adjacent to the former 15. In detail, the 2nd conveyance mechanism 16 is arrange | positioned in the back of the tube 51 seeing from the front of the bag making packaging machine 10, as shown in FIG.

  The second transport mechanism 16 mainly includes a second belt 61, a second intake pipe (not shown), a second drive roller 62, a second driven roller 63, and a second drive motor (not shown). The second belt 61 is disposed along the longitudinal direction of the tube 51. The second belt 61 also has a plurality of suction holes. The second intake pipe generates a negative pressure. The second belt 61 sucks the tubular film Fc through the suction hole by the negative pressure generated by the second intake pipe. The second drive roller 62 is driven and rotated by the second drive motor. The second driven roller 63 rotates according to the rotation of the second drive roller 62. The second drive motor is a servo motor. The second drive motor is a motor different from the first drive motor 46. The second drive motor is also driven or stopped in conjunction with the operation of the lateral seal mechanism 18. The second drive motor is also controlled by the control unit 94.

(2-5) Vertical Sealing Mechanism The vertical sealing mechanism 17 is a mechanism that heats the overlapping portion of the tubular film Fc wound around the tube 51 while pressing it against the tube 51 with a constant pressure, and vertically seals it. As shown in FIG. 1, the vertical seal mechanism 17 is arranged along the longitudinal direction of the tube 51 on the front side of the bag making and packaging machine 10. The vertical sealing mechanism 17 includes a heater and a heater belt that is heated by the heater and contacts an overlapping portion of the cylindrical film.

(2-6) Horizontal Seal Mechanism The horizontal seal mechanism 18 is a mechanism that forms an upper seal portion and a lower seal portion on the tubular film Fc by laterally sealing the tubular film Fc. The horizontal seal mechanism 18 is disposed downstream of the former 15, the second transport mechanism 16, and the vertical seal mechanism 17 in the transport direction of the tubular film Ft.

  The lateral sealing mechanism 18 mainly includes a pair of sealing jaws incorporating a heater. The pair of seal jaws are located on the front side and the rear side of the tubular film Fc. The pair of seal jaws move so as to approach and separate from each other while sandwiching the cylindrical film Fc while turning so as to draw a substantially D-shaped locus that is symmetrical in the longitudinal direction. The pair of seal jaws is in the state of being closest to each other, contacts a portion (sealed portion) that becomes the upper seal portion or the lower seal portion of the tubular film Fc, and heats the sealed portion with a heater. In addition, a cutter (not shown) is incorporated in one of the pair of seal jaws. The cutter cuts the center in the height direction of the sealed portion. By cutting the sealed portion with a cutter, one bag is separated from the subsequent cylindrical film Fc.

(2-7) Storage Unit The storage unit 93 includes a ROM, a RAM, a hard disk, and the like. The storage unit 93 stores various programs executed by the control unit 94 and information for driving each mechanism by the control unit 94. The information for driving each mechanism includes, for example, the speed for driving each mechanism, the timing for driving or stopping each mechanism, and the like set by the user.

  Here, the speed for driving the first drive motor 46 and the second drive motor, and the timing for driving or stopping the first drive motor 46 and the second drive motor will be described.

  The storage unit 93 stores different values as speeds for driving the first drive motor 46 and the second drive motor. Thereby, the first drive motor 46 and the second drive motor are driven at different speeds. Specifically, the storage unit 93 stores a value such that the second drive motor is driven at a slightly higher speed than the first drive motor 46. More specifically, the driving speeds of the first drive motor 46 and the second drive motor maintain the state where the sheet-like film Fs between the first transport mechanism 14 and the former 15 is under a certain tension (tension state). It is like this.

  The storage unit 93 also stores different values for the timing for driving or stopping the first drive motor 46 and the second drive motor. That is, the first drive motor 46 and the second drive motor are driven or stopped at different timings. Specifically, a timing value is set such that the second drive motor is stopped before the first drive motor 46 so that the sheet film Fs between the first transport mechanism 14 and the former 15 is slightly slackened. Has been. The timing value is set so that the second drive motor is driven before the first drive motor 46 to recover the tension state. The difference between the timing values for driving or stopping the first drive motor 46 and the second drive motor is 0.01 seconds or less. For example, the first drive motor 46 is driven or stopped with a delay of about 0.01 seconds from the drive or stop of the second drive motor.

(2-8) Control Unit As shown in FIG. 5, the control unit 94 includes an operation switch 91, an operation display 92, a film supply mechanism 11, a light sensor 47, a first transport mechanism 14, a second transport mechanism 16, and a vertical seal A mechanism 17 and a lateral seal mechanism 18 are connected. Further, the control unit 94 controls the operation display 92, the film supply mechanism 11, the first transport mechanism 14, the second transport mechanism 16, the vertical seal mechanism 17, and the horizontal seal mechanism 18 based on the data stored in the storage unit 93. To drive.

(3) Overall operation of bag making and packaging machine The film supply mechanism 11 feeds the sheet-like film Fs from the film roll Fr. The sheet-like film Fs fed out from the film roll Fr is guided by the tension roller 12, and the conveyance angle changes by approximately 90 degrees. The sheet-like film Fs whose conveyance angle has been changed by the tension roller 12 is conveyed in a substantially vertical direction and guided to the tension roller 13. The sheet-like film Fs guided by the tension roller 13 further changes the conveyance angle by approximately 90 degrees. In the film supply mechanism 11, the air shaft 111 is driven based on the vertical displacement amount of the tension roller 12 so that the tension of the sheet film Fs is maintained within a predetermined range, and the sheet film Fs. Will be paid out.

  The first transport mechanism 14 transports the sheet film Fs toward the former 15 while sucking the sheet film Fs. The former 15 forms the sheet-like film Fs into a tubular film Fc. The vertical sealing mechanism 17 vertically seals the overlapping portion of the tubular film Fc. The second transport mechanism 16 transports the tubular film Fc downstream. Thereafter, the lateral seal mechanism 18 laterally seals the sealed portion of the tubular film Fc in the state where the article C is present in the tubular film Fc, and forms a lower seal portion on the tubular film Fc. An upper seal portion serving as an upper sealing portion of the bag 30 is formed. The horizontal sealing mechanism 18 separates the preceding bag 30 and the subsequent cylindrical film Fc with a cutter simultaneously with the horizontal sealing operation.

(4) Driving / Stopping Operation of First Conveying Mechanism and Second Conveying Mechanism (4-1) Process Flow First, in FIG. 6A, the controller 94 drives and stops the first conveying mechanism 14 and the second conveying mechanism 16. The flow which shows the flow of operation | movement is shown.

  In step S <b> 101, the control unit 94 determines whether it is the conveyance timing of the sheet-like film Fs in light of the driving timing of the horizontal sealing mechanism 18. If it is not the conveyance timing in step S101, the process waits until the conveyance timing is reached. If it is determined in step S101 that the conveyance timing has come, the process proceeds to step S102.

  In step S102, the control unit 94 transmits a drive command to the second drive motor. Thereafter, in step S103, it is determined whether or not a predetermined time has elapsed. In step S103, the process waits until a predetermined time elapses. When the predetermined time elapses, the process proceeds to step S104.

  In step S <b> 104, the control unit 94 transmits a drive command to the first drive motor 46. Then, it progresses to step S105 and it is judged whether it became the conveyance stop timing of the sheet-like film Fs. If it is not the conveyance stop timing in step S105, the process waits until the conveyance stop timing is reached. If it is determined in step S105 that the conveyance stop timing has come, the process proceeds to step S106.

  In step S106, the control unit 94 transmits a stop command to the second drive motor. Then, it progresses to step S107 and it is judged whether predetermined time passed. In step S107, the process waits until a predetermined time elapses. When the predetermined time elapses, the process proceeds to step S108.

  In step S <b> 108, the control unit 94 transmits a stop command to the first drive motor 46. Then, it returns to step S101.

(4-2) Timing Chart Next, the drive or stop timing of the first transport mechanism 14 and the second transport mechanism 16 will be described with reference to FIG. 6B. In FIG. 6B, the vertical axis represents the driving speed of the driving motor, and the horizontal axis represents time. A broken line TB indicates a driving state of the first driving motor 46, and a solid line PDB indicates a driving state of the second driving motor.

  The first transport mechanism 14 and the second transport mechanism 16 are driven based on the values stored in the storage unit 93 as described above. Specifically, the first drive motor 46 and the second drive motor are driven based on the values stored in the storage unit 93, the first drive motor 44 is driven by the drive of the first drive motor 46, and the second drive is performed. The second driving roller 62 is driven by driving the motor.

  As described above, the first transport mechanism 14 and the second transport mechanism 16 stop at different timings and are driven at different timings. Specifically, as shown in FIG. 6B, the first drive motor 46 stops after a slight delay after the second drive motor stops. The first drive motor 46 is driven with a slight delay after the second drive motor is driven. As a result, the tension state of the sheet film Fs between the first transport mechanism 14 and the former 15 changes.

  Specifically, at the time of stop, the sheet-like film Fs between the first transport mechanism 14 and the former 15 is in a state where no tension is applied. More specifically, the tension state of the sheet-like film Fs is slightly loosened between the first transport mechanism 14 and the former 15, and the sheet-like film Fs is slightly slackened. On the other hand, when the first drive motor 46 and the second drive motor are driven, the second drive motor starts to be driven slightly earlier than the first drive motor 46. The second drive motor is driven at a slightly higher speed than the first drive motor 46. Therefore, a certain tension is again applied to the sheet-like film Fs that has been slightly slackened between the first transport mechanism 14 and the former 15. Here, the state in which a certain tension is applied is a state in which the sheet-like film Fs between the former 15 and the first transport mechanism 14 is stretched and is difficult to meander.

(5) Features (5-1)
In the bag making and packaging machine according to the embodiment, the second transport mechanism 16 installed along the former contacts one side of the tubular film Ft and pulls the tubular film Ft in the downstream direction while adsorbing the tubular film Ft. Thereby, compared with the aspect which arrange | positions a pair of pull-down belt on the both sides of the cylindrical film Ft, the effort concerning adjustment of pinching pressure can be saved.

  Moreover, in the said embodiment, in order to supplement the pull-down force of the cylindrical film Ft by the 2nd conveyance mechanism 16, the 1st conveyance mechanism 14 is installed in the film conveyance direction upstream with respect to the former. The first transport mechanism 14 pulls in the downstream direction while adsorbing the sheet-like film Fs before being formed into a cylindrical shape. Thereby, a film can be reliably conveyed toward a downstream.

  Here, the tension state of the sheet-like film Fs is adjusted based on the displacement amount of the tension roller (dancer roller) 12. Specifically, the conveyance state of the sheet-like film Fs is kept good by adjusting the amount of the sheet-like film Fs fed out from the film roll based on the displacement amount of the tension roller 12. More specifically, the tension of the sheet film Fs is controlled by controlling the amount by which the sheet film Fs is fed. However, since the first transport mechanism 14 is disposed between the tension roller 12 and the former 15, the tension state of the sheet-like film Fs between the first transport mechanism 14 and the former 15 is changed to the tension roller 12. It is difficult to adjust based on the amount of displacement. In addition, it is conceivable to separately arrange a tension roller between the first transport mechanism 14 and the former 15;

  In the bag making and packaging machine 10 according to the above embodiment, the first drive motor that drives the first transport mechanism 14 and the second drive motor that drives the second transport mechanism 16 stop at different timings and are further driven. . Thereby, conveyance of a downstream film can be kept favorable with respect to the 1st conveyance mechanism 14, and also the tension state of the sheet-like film Fs between the 1st conveyance mechanism 14 and the former 15 can be adjusted. it can.

(5-2)
In the above embodiment, the first transport mechanism 14 is driven by driving the second drive motor at a slightly higher speed than the first drive motor while the first drive motor and the second drive motor are being driven. And a certain tension of the sheet-like film Fs between the former 15 and the former 15 is secured. In addition, when the first drive motor and the second drive motor are stopped, the timing of stopping the first drive motor and the second drive motor is shifted, so that the sheet-like film Fs between the first transport mechanism 14 and the former 15 is moved. The tension is slightly loosened. If the sheet-like film Fs between the first transport mechanism 14 and the former 15 is always stretched, the sheet-like film Fs in front of the former is at the start of driving the first drive motor and the second drive motor. It can be damaged by the sailor 52. However, when the first drive motor and the second drive motor are stopped, the tension state of the sheet-like film Fs between the first transport mechanism 14 and the former 15 is slightly loosened. Damage can be prevented.

(5-3)
In the bag making and packaging machine according to the above-described embodiment, the driving speed of the first transport mechanism 14 and the second transport mechanism 16 is set to be constant. In order to adjust the tension state of the sheet-like film Fs between the first transport mechanism 14 and the former 15 according to the timing of stopping and driving the first transport mechanism 14 and the second transport mechanism 16, the first transport mechanism 14 and It is not necessary to change the driving speed of the second transport mechanism 16, and the setting is easy.

(5-4)
In the bag making and packaging machine according to the embodiment, the first transport mechanism 14 transports the sheet film Fs in the downstream direction while adsorbing the sheet film Fs. In the first transport mechanism 14, the first belt 42 always adsorbs the sheet-like film Fs through the plurality of suction holes 421 due to the negative pressure constantly generated by the first intake pipe 43. Thereby, even when the sheet-like film Fs between the first transport mechanism 14 and the former 15 is once loosened, it is possible to prevent the deviation of the left-right position and / or the deviation of the front-rear position of the sheet-like film Fs. it can.

(6) Modification (6-1) Modification A
In the above embodiment, as shown in FIG. 6B, the timing at which the first drive motor 46 is stopped is slightly delayed from the timing at which the second drive motor is stopped. The tension of the sheet-like film Fs was loosened. However, as shown in FIG. 7, the control unit 94 slightly increases the drive speed of the first drive motor 46 immediately before the first drive motor 46 and the second drive motor are stopped, and the first drive motor 46 and the second drive motor. The tension of the sheet-like film Fs between the first transport mechanism 14 and the former 15 may be relaxed by stopping the two simultaneously.

(6-2) Modification B
In the above-described embodiment, the first driving motor 46 and the second driving motor are driven at different timings, so that the tension is once again applied to the sheet-like film Fs that has once been loosened. However, instead of the above control, as shown in FIG. 8 or FIG. 9, the first drive motor 46 and the second drive motor are driven at the same timing by slightly increasing the drive speed at the start of driving the second drive motor. By doing so, the tension may be applied again to the sheet-like film Fs whose tension has been once relaxed.

(6-3) Modification C
Moreover, in the said embodiment, the tension roller 12 becomes a structure which can move to an up-down direction, and the structure which can be moved to the left-right direction may be sufficient as the tension roller 12. Further, the tension roller 12 may have a function of prompting the conveyance of the sheet film Fs.

DESCRIPTION OF SYMBOLS 10 Bag making packaging machine 11 Film supply mechanism 12, 13 Dancer roller 14 1st conveyance mechanism 15 Former 16 2nd conveyance mechanism 17 Vertical sealing mechanism 18 Horizontal sealing mechanism Fr Film roll Fs Sheet-like film Ft Cylindrical film

JP 2008-168931 A

Claims (5)

A film supply mechanism for supplying a sheet film;
A dancer roller that moves according to the conveying state of the sheet-like film;
A former for transforming the sheet-like film into a tubular film;
Driven by the first drive unit to convey the sheet-like film, and is disposed downstream of the dancer roller in the conveyance direction of the sheet-like film and upstream of the former in the conveyance direction of the sheet-like film. A first transport mechanism;
A second transport mechanism disposed adjacent to the former, driven by a second drive unit, and transporting the tubular film at a speed faster than the first transport mechanism;
A control unit that changes the transport state of the film between the first transport mechanism and the second transport mechanism by independently controlling the first drive unit and the second drive unit;
A sealing mechanism for sealing the cylindrical film to form a bag;
Comprising
Bag making and packaging machine. The control unit drives and stops the first drive unit and the second drive unit at different timings, and changes the tension state of the sheet-like film between the first transport mechanism and the former.
The bag making and packaging machine according to claim 1. The control unit stops the second drive unit before the first drive unit;
The bag making and packaging machine according to claim 1 or 2. The control unit drives the second drive unit prior to the first drive unit.
The bag making and packaging machine according to claim 3. The first transport mechanism includes a first vacuum that always sucks the sheet film.
The bag making and packaging machine according to any one of claims 1 to 4.

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