JP7052998B2 - Bag making and packaging machine - Google Patents

Description

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

In recent years, bag-making and packaging machines that wrap articles by forming them into a cylinder while transporting a strip-shaped film have become widespread. For example, in the bag making and packaging machine disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2015-178376), in order to form a vertical seal portion having a desired length for each bag, a fixed amount is conveyed a plurality of times. It is done, and vertical sealing is done every time it is transported. Further, the feed amount of each vertical seal portion is set so that the front and rear vertical seal portions overlap each other with a uniform length.

However, if the feed amount for each of the multiple transports is constant and the front and rear vertical seals are set to overlap with each other with a uniform length, the same feed amount is used until one feed before the final transport. However, the final feed amount is an amount adjusted according to the actual bag length.

Therefore, when the feed amount in the final round is small, the vertical seal portion that has been sealed once is sealed again, and then the overlap portion is further sealed, and there is a place where the seal is performed up to three times. .. If the same location is sealed three times, the sealed state may deteriorate or the seal may be blown.

An object of the present invention is to provide a bag making and packaging machine capable of avoiding three vertical sealings at the same location.

In the bag making / packaging machine according to the first aspect of the present invention, a film to be intermittently conveyed is wound along the outer circumference of a tubular member, and the ends of the films are overlapped with each other along the film conveying direction. It is a bag-making and packaging machine that forms a shaped film, vertically seals the overlapping part of the tubular film, puts the product in the tubular film and performs horizontal sealing, and controls the vertical sealing member that performs vertical sealing. It has a control unit. The control unit performs vertical sealing unless the feed amount of the final transport is the same as the feed amount of the previous feed among a plurality of intermittent transports for obtaining a transport distance equivalent to one bag. The operation of the vertical seal member is made to stand by for the overlapping portion to be.

In this bag-making and packaging machine, among a plurality of intermittent transports for obtaining a transport distance equivalent to one bag, the "feed amount of one transport before the final round" is a preset fixed amount. Therefore, if the "feed amount of the final transport" is the same as the "feed amount of the previous feed", the situation where the same location is vertically sealed three times does not occur even if the vertical seal member is operated. However, in other cases, the operation of the vertical sealing member is made to stand by to prevent the situation where the same portion is vertically sealed three times.

The bag-making and packaging machine according to the second aspect of the present invention is the bag-making and packaging machine according to the first aspect, and each feeding amount is a constant amount from the second transportation to the one before the final transportation. ..

In this bag making and packaging machine, the "feed amount of the final transport" is adjusted to avoid the situation where the same place is vertically sealed three times, and the next "feed amount of the first transport" is adjusted. Is also adjusted in relation to the previous "feed amount of the final transport". Therefore, there is no problem even if each feed amount is a constant amount from the second transport to the "transport before the final feed".

The bag-making / packaging machine according to the third aspect of the present invention is the bag-making / packaging machine according to the second aspect, and the control unit stores the feed amount of the final transportation. Further, the control unit sets the feed amount of the first transport of the next bag to an amount obtained by subtracting the feed amount of the final feed from a fixed amount.

In this bag making and packaging machine, when the "feed amount of the final transport" is less than a certain amount, the feed amount corresponding to the shortage is referred to as the "feed amount of the first transport" of the next bag. By doing so, the vertical sealing is performed after waiting for the feed amount to reach a certain amount, so that it is possible to prevent a situation in which the same portion is vertically sealed three times.

The bag-making / packaging machine according to the fourth aspect of the present invention is the bag-making / packaging machine according to the first aspect, and registration marks are printed on the film at predetermined intervals. It also has a sensor to detect the registration mark. The control unit makes the feed amount of the transport after the registration mark is detected different from the feed amount of the transport one time before.

In this bag making and packaging machine, the cash register mark needs to be stably located in a predetermined place on the bag. Therefore, the fact that the registration mark is detected means that the registration mark has reached a certain distance from the predetermined location. Therefore, by transporting the feed amount preset from the detection, the cash register mark is stably positioned at a predetermined position on the bag.

The bag-making / packaging machine according to the fifth aspect of the present invention is the bag-making / packaging machine according to the fourth aspect, and each feed amount is from the second transfer to the previous transfer when the registration mark is detected . Is a fixed amount.

The bag-making / packaging machine according to the sixth aspect of the present invention is the bag-making / packaging machine according to the fifth aspect, and the control unit stores the feed amount of the final transportation. Further, the control unit sets the feed amount of the first transport of the next bag to an amount obtained by subtracting the feed amount of the final feed from a fixed amount.

In this bag making and packaging machine, when the "feed amount of the final transport" is less than a certain amount, the feed amount corresponding to the shortage is referred to as the "feed amount of the first transport" of the next bag. By doing so, the vertical sealing is performed after waiting for the feed amount to reach a certain amount, so that it is possible to prevent a situation in which the same portion is vertically sealed three times.

The bag-making / packaging machine according to the seventh aspect of the present invention is a bag-making / packaging machine according to any one of the first to sixth aspects, and is vertically formed three times with respect to the same region of the overlapping portion of the tubular films. Avoid seals.

In the bag-making and packaging machine according to the first aspect of the present invention, the "feed amount of one transport before the final round" is the "feed amount of one transport before the final round" among a plurality of intermittent transports for obtaining a transport distance corresponding to one bag. Since it is a preset fixed amount, if the "feed amount of the final feed" is the same as the "feed amount of the previous feed", the same location will be vertically sealed three times even if the vertical seal member is operated. However, in other cases, the operation of the vertical sealing member is made to stand by to prevent the situation where the same portion is vertically sealed three times.

The side view of the bag making packaging machine which concerns on 1st Embodiment of this invention. Side view around the vertical sealing means. Front view of the vertical sealing means. Block diagram of the control system of the bag making and packaging machine. Control flowchart of bag making and packaging machine (step S1 to step S10). Control flowchart of bag making and packaging machine (step S11 to step S14B). The conceptual diagram which shows the implementation of the 1st intermittent transfer and the vertical seal. The conceptual diagram which shows the implementation of the 2nd intermittent transfer and the vertical seal. The conceptual diagram which shows the implementation of the 3rd intermittent transfer and the vertical seal. A conceptual diagram showing the implementation of the fourth intermittent transfer and vertical sealing. The conceptual diagram which shows the 5th intermittent transport and the 5th vertical seal waiting. The conceptual diagram which shows the 1st intermittent transfer of the next bag and the implementation of a vertical seal. The conceptual diagram which shows the 2nd intermittent transfer of the next bag and the execution of a vertical seal. The conceptual diagram which shows the 3rd intermittent transfer of the next bag and the execution of a vertical seal. The conceptual diagram which shows the 4th intermittent transfer of the next bag and the execution of a vertical seal. The conceptual diagram which shows the 5th intermittent transfer of the next bag and the waiting of the 5th vertical seal. Schematic diagram of all sealed parts for the length of the bag. Schematic diagram of all sealed parts for the length of the bag. Control flowchart of bag making and packaging machine (step S101 to step S109). Control flowchart of bag making and packaging machine (step S110 to step S112). The block diagram of the control system of the bag making and packaging machine which concerns on 2nd Embodiment of this invention. The control flowchart of the bag making and packaging machine which concerns on 2nd Embodiment of this invention (step S61-step S69). The control flowchart of the bag making and packaging machine which concerns on 2nd Embodiment of this invention (step S71-step S75B). The control flowchart of the bag making and packaging machine which concerns on 2nd Embodiment of this invention (step S81-step S89B). The control flowchart of the bag making and packaging machine which concerns on the modification of 2nd Embodiment (step S161 to step S169). The control flowchart (step S171 to step S174B) of the bag making and packaging machine which concerns on the modification of 2nd Embodiment. The control flowchart (step S181 to step S188B) of the bag making and packaging machine which concerns on the modification of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<First Embodiment>
(1) Configuration of Bag-making / Packaging Machine 100 FIG. 1 is a side view of the bag-making / packaging machine 100 according to the first embodiment of the present invention. In FIG. 1, the bag-making and packaging machine 100 includes a film supply unit 1, an article loading unit 2, a packaging unit 3, an operation display unit 4, and a housing 5.

The film supply unit 1 supplies the strip-shaped film F from the film roll FR. The article loading unit 2 receives articles loaded from above. The packaging unit 3 packages the articles to be loaded from the article loading section 2 with the band-shaped film F supplied from the film supply section 1. The operation display unit 4 performs a predetermined input operation and a predetermined display. The housing 5 supports these components.

Hereinafter, for convenience of explanation, the place where the operation display unit 4 is arranged is the front part of the bag making / packaging machine 100, and the place where the film roll FR is arranged is the rear part of the bag making / packaging machine 100, and goes toward the front part and the rear part. The directions are called forward and backward.

(1-1) Film supply unit 1
The film supply unit 1 supplies the strip-shaped film F unwound from the film roll FR to the packaging unit 3 in the housing 5. As the film F, a single-layer or multi-layer polyethylene film is used, and the overlapping portions overlapped with each other are heat-welded by the heater means.

(1-2) Goods input section 2
The article loading section 2 has an inlet for loading articles to be packaged into the housing 5 from above. The article may be manually loaded from the article loading section 2, or may be automatically loaded from a weighing device or the like arranged above the article loading section 2.

(1-3) Packaging section 3
The packaging unit 3 has a film forming means 10, a vertical sealing means 20, a transporting means 30, and a horizontal sealing means 40.

The film forming means 10 forms the strip-shaped film F supplied from the film supply unit 1 into a tubular body Tu by superimposing both side edges thereof. The vertical sealing means 20 heat-welds the overlapping portions W of both side edges of the tubular body Tu. The transport means 30 transports the tubular body Tu downward. The lateral sealing means 40 heat-welds the tubular body Tu in the width direction and cuts the tubular body Tu at a substantially central portion in the transport direction of the heat-welded portion.

(1-3-1) Film forming means 10
The film forming means 10 has an article input pipe 11 and a forming plate 12. The article loading pipe 11 is connected to the article loading section 2 and extends downward. The forming plate 12 guides the strip-shaped film F unwound from the film roll FR along the outer peripheral surface of the article input pipe 11 so that its both side edges overlap. The strip-shaped film F passes through the gap between the article input pipe 11 and the molding plate 12, so that a tubular body Tu in which both side edges of the strip-shaped film F overlap is formed.

(1-3-2) Vertical sealing means 20
FIG. 2 is a side view of the periphery of the vertical sealing means 20. In FIG. 2, the vertical sealing means 20 includes a heater 21, a heater driving device 22, a heat-resistant non-adhesive sheet 23, and a film holding member 24.

The heater drive device 22 moves the heater 21 back and forth between the seal position where the vertical seal is performed and the standby position retracted from the seal position. The heat-resistant non-adhesive sheet 23 is arranged between the heater 21 and the overlapping portion W. The film pressing member 24 presses the heat-resistant non-adhesive sheet 23 toward the overlapping portion W.

(1-3-2-1) Heater 21
The heater 21 abuts on the overlapping portion W via the heat-resistant non-adhesive sheet 23 at the seal position indicated by the solid line, and is retracted from the heat-resistant non-adhesive sheet 23 and the overlapping portion W at the standby position indicated by the broken line.

The temperature of the heater 21 is adjusted by the control unit 50, and when it is located at the seal position, it comes into contact with the overlapping portion W via the heat-resistant non-adhesive sheet 23, and the overlapping portion W is heat-welded in the vertical direction.

(1-3-2-2) Heater drive device 22
The heater drive device 22 reciprocates the heater 21 between the seal position and the standby position in the front-rear direction. The specific configuration of the heater drive device 22 is not particularly limited.

(1-3-2-3) Heat-resistant non-adhesive sheet 23
The heat-resistant non-adhesive sheet 23 is a sheet having heat resistance that can withstand the temperature at which the film F is heat-welded and that is non-adhesive to the film F and the heater 21, and is, for example, PTFE (polytetra). Sheets coated with (fluoroethylene) can be used.

The heat-resistant non-adhesive sheet 23 is unwound from the sheet roll SR (see FIG. 1) disposed on the upper part of the housing 5 and hangs down in the film heating region between the heater 21 and the overlapping portion W.

Further, the heat-resistant non-adhesive sheet 23 is repeatedly used for heat welding by the heater 21, for example, after being used for heat welding a predetermined number of times, a new sheet portion is supplied from the sheet roll SR to the heating region.

(1-3-2-4) Film holding member 24
The film holding member 24 is a plate-like body provided so as to face the overlapping portion W, and a bent portion 24a bent forward is provided on the upper portion, and the heat resistance is hung from above by the bent portion 24a. The non-adhesive sheet 23 is guided to the heating region.

FIG. 3 is a front view of the vertical sealing means. In the front view of FIG. 3, the film holding member 24 has an opening 24b facing the vertical sealing means 20, and the heater 21 moves in the front-rear direction between the sealing position and the standby position through the opening 24b. As a result, both the film pressing member 24 and the heater 21 can be arranged in the heating region of the film F, so that both can be compactly arranged in the film transport direction.

An elastic member 24c made of a brushed sheet having brushed densely formed on one surface of the base material, for example, a hook-and-loop fastener member is attached to the rear surface of the film pressing member 24, that is, the surface in contact with the heat-resistant non-adhesive sheet 23. Has been done.

By pressing the heat-resistant non-adhesive sheet 23 via the elastic member 24c, the surface pressure between the film pressing member 24 and the heat-resistant non-adhesive sheet 23 is relaxed, and the heat-resistant non-adhesive sheet 23 is pressed to an appropriate surface. It is evenly overlapped by pressure and pressed against the portion W.

(1-3-3) Transport means 30
The transport means 30 includes a drive roller 31 and a pair of upper and lower driven rollers 32 arranged in front of and behind the article input pipe 11. The tubular body Tu is conveyed downward between the drive roller 31 and the driven roller 32. The drive roller 31 is driven by an AC motor or a stepping motor (not shown). In the case of an AC motor, the feed amount is set in the minimum resolution m unit using a rotary encoder. In the case of a stepping motor, the feed amount is controlled by the number of pulses.

(1-3-4) Horizontal sealing means 40
The lateral sealing means 40 includes a pair of sealing jaws 41 and 42. The pair of seal jaws 41 and 42 are arranged on both front and rear sides of the tubular body Tu below the article input pipe 11. The pair of seal jaws 41, 42 are heat-welded in the width direction (horizontal direction) between the preceding bag body portion and the succeeding bag body portion of the tubular body Tu, and the welded portion is cut at a substantially intermediate portion in the transport direction. do.

The position of the bottom of the packaging bag P of the tubular body Tu is heat-welded by the horizontal sealing means 40, and the upper end (rear end) of the preceding bag body and the lower end (tip) of the succeeding bag body are heat-welded and closed. At the same time, the heat-welded seal portion is cut and the preceding bag body is separated from the succeeding bag body.

After that, a predetermined amount of the article is charged into the subsequent bag body from the article charging section 2 through the article charging pipe 11. The upper part of the subsequent bag containing the article is similarly heat-welded and cut in the width direction by the lateral sealing means 40 to generate a packaging bag P in which the article is packaged.

The packaging bag P is then discharged to a belt conveyor (not shown) from a discharge chute 9 provided below the packaging unit 3.

(1-4) Operation display unit 4
The operation display unit 4 is provided with an input unit (not shown), a display unit, and an operation unit. The input unit inputs various information including the setting of the specifications of the packaging bag and the setting of the formation conditions of the vertical seal. The display unit displays various information including the operation information of the bag making and packaging machine 100 and the information of the article to be packaged. The operation unit includes a start button and an emergency stop button.

(2) Control system of the bag making / packaging machine 100 FIG. 4 is a block diagram of the control system of the bag making / packaging machine 100. In FIG. 4, various operations of the bag making / packaging machine 100 are controlled by the control unit 50. The control unit 50 is provided with a storage unit 51, a feed amount setting unit 52, a transport means control unit 53, a vertical seal means control unit 54, and a horizontal seal means control unit 55.

The storage unit 51 stores various information necessary for the operation of the bag making / packaging machine 100. The feed amount setting unit 52 sets the feed amount by the transport means 30. The transport means control unit 53 controls the transport means 30. The vertical sealing means control unit 54 controls the vertical sealing means 20. The horizontal seal means control unit 55 controls the horizontal seal means 40. The mounting position of the control unit 50 is not limited, but in the present embodiment, it is mounted on the housing 5 (see FIG. 1).

A signal from the operation display unit 4 is input to the control unit 50. A signal from the weighing device may be input to the control unit 50 to control the operation in conjunction with the loading of articles by the weighing device.

Further, the control unit 50 transmits a control signal to the vertical sealing means 20, the transporting means 30, the horizontal sealing means 40, and the operation display unit 4 based on the information stored in the storage unit 51 and / or various input signals. Output.

(2-1) Storage unit 51
In the storage unit 51, for example, information about the screen displayed on the operation display unit 4, information about the product to be packaged, information about the packaging bag set by input in the operation display unit 4, vertical sealing means 20, transport means 30 , Various information including driving conditions for driving the lateral sealing means 40 are stored. Various information stored in the storage unit 51 can be changed, added or deleted by an input operation on the operation display unit 4. The information about the packaging bag includes information about the length of the packaging bag.

(2-2) Feed amount setting unit 52
The feed amount setting unit 52 sets each feed amount by the transport means 30 so as to form a full vertical seal portion having a desired bag length L. Specifically, the feed amount setting unit 52 has front and rear vertical seals based on the transport direction length of the heater 21 stored in the storage unit 51 and the desired bag length L input to the operation display unit 4. The number of transports by the transport means 30 and each feed amount are set so that the portions overlap by a predetermined length or more.

(2-3) Transport means control unit 53
The transport means control unit 53 sequentially transports the tubular body Tu based on the number of transports set by the feed amount setting unit 52 and each feed amount. After the heater 21 moves from the seal position to the standby position, the transport means control unit 53 lowers the tubular body Tu after a predetermined cooling time for cooling the heat-welded portion formed by the vertical seal means 20. Transport.

(2-4) Vertical seal means control unit 54
The vertical sealing means control unit 54 controls the vertical sealing means 20 to form the vertical sealing unit. Specifically, the heater 21 is controlled to melt the overlapping portion W at the seal position, and the heater drive device 22 is controlled to move the heater 21 between the seal position and the standby position.

(2-5) Horizontal seal means control unit 55
The lateral sealing means control unit 55 controls the lateral sealing means 40 to heat-weld the upper portion of the preceding bag body into which the article is loaded and the lower portion of the subsequent succeeding bag body in the width direction, and both heat. The middle portion of the welded portion is cut to generate a packaging bag P.

(3) Operation of the bag making / packaging machine 100 FIGS. 5A and 5B are control flowcharts of the bag making / packaging machine 100, FIG. 5A shows steps S1 to S9, and FIG. 5B shows steps S10 to S15. Up to. Hereinafter, the operation of the bag making / packaging machine 100 will be described with reference to FIGS. 5A, 5B, 6A to 6E, and 7A to 7E.

Here, FIGS. 6A to 6D are conceptual diagrams showing the implementation of the first to fourth intermittent transports and the vertical seal, and FIG. 6E is a conceptual diagram showing the fifth intermittent transport and the waiting of the fifth vertical seal. be. 7A to 7D are conceptual diagrams showing the first to fourth intermittent transportation of the next bag and the implementation of the vertical seal, and FIG. 7E shows the fifth intermittent transportation and the fifth vertical sealing of the next bag. It is a conceptual diagram which shows the waiting of a seal.

(start)
The control unit 50 operates by turning on the start switch (not shown) of the bag making / packaging machine 100 or receiving the product input signal as a trigger.

(Step S1)
In step S1, the control unit 50 sets the transport conditions for forming the full vertical seal portion for the desired bag length via the feed amount setting unit 52.

In the bag-making and packaging machine 100, since the length a (see FIG. 3) in the transport direction of the heater 21 is shorter than the length L of the bag body manufactured by the bag-making and packaging machine 100, the vertical sealing means 20 is used once. In vertical seal formation, it is not possible to form a vertical seal for a desired bag length.

Therefore, the bag making / packaging machine 100 divides the vertical seal portion having a desired bag length into a plurality of vertical seal portions, and overlaps the vertical seal portions in the front-rear direction (upper and lower) to form a desired bag. Form a long full vertical seal.

First, the feed amount setting unit 52 has a desired bag length L, a length of the vertical sealing means 20 (length in the transport direction of the heater 21) a, an overlap length r, and a reference, based on various numerical values input from the operator. The feed amount b, the number of transports i based on the reference feed amount b, and the final feed amount c are set.

In addition, there is a relationship between the length a of the vertical sealing means 20> the reference feed amount b, and the overlap length r is inevitably set to r = ab.

(Step S2)
Next, in step S2, the control unit 50 sets n = 0 in order to count the number of transports.

(Step S3)
Next, in step S3, the control unit 50 reads the final feed amount bp of the bag from the storage unit 51.

(Step S4)
Next, in step S4, the control unit 50 controls the horizontal sealing means 40 to form the horizontal sealing unit.

(Step S5)
Next, in step S5, the control unit 50 determines whether or not the final feed amount bp of the previous bag is the reference feed amount b, and if bp = b, proceeds to step S6A and bp = b. If not, the process proceeds to step S6B.

(Step S6A)
Next, in step S6A, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with the reference feed amount b. At this time, as shown in FIG. 6A, the heater 21 of the vertical sealing means 20 is in the standby position.

(Step S6B)
Further, when the control unit 50 proceeds to step S6B, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with a feed amount bbp.

(Step S7)
Next, in step S7, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit hi.

Specifically, the control unit 50 controls the heater drive device 22 to move the heater 21 from the standby position to the seal position as shown in FIGS. 6A to 6D. Then, the control unit 50 heat-melts the overlapping portion W by the heater 21 for a predetermined time. At this time, the transport means 30 is stopped.

Further, the control unit 50 moves the heater 21 from the seal position to the standby position after the vertical seal (see FIGS. 6B to 6E). At this time as well, the transport means 30 is stopped.

The control unit 50 cools the molten vertical seal portion for a predetermined cooling time after the heater 21 moves to the standby position to form the vertical seal portion.

(Step S8)
Next, in step S8, the control unit 50 updates the number of transports n to "n + 1" because the transport for one time is completed.

(Step S9)
Next, in step S9, the control unit 50 determines whether or not the number of transports n has reached “i-1”, which is one less than the set number i, and when it is determined that n ≧ i-1. Proceed to step S10.

On the other hand, when it is determined that n ≧ i-1, the control unit 50 returns to step S6A and causes the control unit 50 to repeatedly perform the operations from the transfer at the reference feed amount b to the step S8. In this embodiment, i-1 = 4 as described in FIGS. 6A to 6D.

8A and 8B are schematic views of all the sealed portions for the length of the bag. In FIGS. 8A and 8B, each time the overlapping portion W is conveyed by the conveying means 30 with the feed amount b, the vertical sealing means 20 forms the vertical sealing portions h1 to h4.

As shown in FIGS. 8A and 8B, the vertically sealed portions h1 to h4 formed separately have vertical seal portions hn-1 and hn + 1 whose front portion (upper portion) and rear portion (lower portion) are front-rear (upper and lower). Overlap by r (= ab) between them.

(Step S10)
Next, in step S10, the control unit 50 calculates the final feed amount c. The final feed amount c corresponds to a value obtained by subtracting the total feed amount “b × (i-1) −bp” of the feed amount already transported from the bag length L.

(Step S11)
Next, in step S11, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with the feed amount c.

(Step S12)
Next, in step S12, the control unit 50 stores the feed amount carried out in step S11 via the storage unit 51 as the final feed amount bp.

(Step S13)
Next, in step S13, the control unit 50 determines whether or not the final feed amount c is equal to the reference feed amount b, and if it is determined that “c = b”, the control unit 50 proceeds to step S14A and “c. When it is determined that "= b", the process proceeds to step S14B.

(Step S14A)
Next, in step S14A, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

(Step S14B)
On the other hand, when the control unit 50 proceeds to step S14B, the vertical sealing means 20 is made to stand by without forming the vertical sealing by the vertical sealing means 20.

This is because the control unit 50 changes the feed amount in the i-th (here, the fifth) transport from the reference feed amount b to the remaining feed amount c as shown in FIGS. 6E and 8A, and changes the tubular body Tu. Since it is transported downward and the feed amount c for the i-th (here, the fifth) feed amount is shorter than the reference feed amount b, the formation of the vertical seal is postponed here, and the feed amount "bc" is next time. This is because the total feed amount is set to the predetermined feed amount b by transporting with the above.

By repeating the processes of steps S1 to S14B in this way, the amount of overlap between the front and rear (upper and lower) vertical seal portions is always maintained constant (here, ab), and the same location is formed. The situation of vertical sealing three times is also prevented.

6A to 6E and 8A show that the feed amount in the first transport is the reference feed amount b, and the feed amount in the final feed (here, the fifth feed) is c (c <b). It is drawn assuming that.

On the other hand, in FIGS. 7A to 7E and 8B, the feed amount in the first transfer is bc, and the feed amount bp in the final (here, the fifth) is c'(c'<b). It is drawn assuming that.

That is, as shown in FIGS. 7A and 8B, when the preceding bag was made, the final feed amount c was shorter than the reference feed amount b, so that the vertical seal after the final feed was used. There is a history of forgoing the formation. Therefore, the total feed amount can be set to the reference feed amount b by performing the first transport at the time of the next bag making with the feed amount "bc".

As a result, the amount of overlap between the front and rear (upper and lower) vertical seal portions is always maintained constant (here, ab), and the situation where the same portion is vertically sealed three times is prevented. Will be done.

(4) Modification Example of the First Embodiment In the first embodiment, in principle, the vertical seal is performed and then the horizontal seal is performed. However, here, a modification in which the vertical seal and the horizontal seal are performed at the same time will be described.

9A and 9B are control flowcharts of the bag making and packaging machine 100, FIG. 9A shows steps S101 to S109, and FIG. 9B shows steps S110 to S112. Hereinafter, the operation of the bag making / packaging machine 100 will be described with reference to FIGS. 9A and 9B.

(start)
The control unit 50 operates by turning on the start switch (not shown) of the bag making / packaging machine 100 or receiving the product input signal as a trigger.

(Step S101)
In step S101, the control unit 50 sets the transport conditions for forming the full vertical seal portion for the desired bag length via the feed amount setting unit 52.

First, the feed amount setting unit 52 has a desired bag length L, a length of the vertical sealing means 20 (length in the transport direction of the heater 21) a, an overlap length r, and a reference, based on various numerical values input from the operator. The feed amount b, the number of transports i based on the reference feed amount b, and the final feed amount c are set.

In addition, there is a relationship between the length a of the vertical sealing means 20> the reference feed amount b, and the overlap length r is inevitably set to r = ab.

(Step S102)
Next, in step S102, the control unit 50 sets n = 0 in order to count the number of times of transportation.

(Step S103)
Next, in step S103, the control unit 50 reads the final feed amount bp of the bag from the storage unit 51.

(Step S104)
Next, in step S104, the control unit 50 determines whether or not the previous final feed amount c is equal to the reference feed amount b, and if it is determined that "bp = b", the process proceeds to step S105A. If it is determined that "bp = b" is not satisfied, the process proceeds to step S105B.

(Step S105A)
Next, in step S105A, the control unit 50 controls the vertical sealing means 20 and the horizontal sealing means 40 to simultaneously form the vertical sealing portion and the horizontal sealing portion. The ability can be improved by performing the vertical seal and the horizontal seal at the same time. The control unit 50 proceeds to step S106A after the process of step S105A.

(Step S105B)
On the other hand, when the control unit 50 proceeds to step S105B, the control unit 50 makes the vertical seal means 20 stand by without forming the vertical seal by the vertical seal means 20, and controls the horizontal seal means 40 to perform the horizontal seal. Form a part.

Here, the formation of the vertical seal is postponed, and then the feed amount is "b-bp", so that the total feed amount is set to the predetermined feed amount b.

(Step S106A)
Next, in step S106A, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with the reference feed amount b.

(Step S106B)
Further, when the control unit 50 proceeds to step S106B, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with a feed amount bbp.

(Step S107)
Next, in step S107, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit hi.

Specifically, the control unit 50 controls the heater drive device 22, and the control unit 50 heat-melts the overlapping portion W by the heater 21 for a predetermined time. At this time, the transport means 30 is stopped.

Further, the control unit 50 moves the heater 21 from the seal position to the standby position after the vertical seal. At this time as well, the transport means 30 is stopped.

The control unit 50 cools the molten vertical seal portion for a predetermined cooling time after the heater 21 moves to the standby position to form the vertical seal portion.

(Step S108)
Next, in step S108, the control unit 50 updates the number of transports n to "n + 1" because the transport for one time is completed.

(Step S109)
Next, in step S109, the control unit 50 determines whether or not the number of transports n has reached "i-1", which is one less than the set number i, and when it is determined that n ≧ i-1. The process proceeds to step S110.

On the other hand, when it is determined that n ≧ i-1, the control unit 50 returns to step S106A and causes the control unit 50 to repeatedly perform the operations from the transfer at the reference feed amount b to step S108. In this embodiment, i-1 = 4.

(Step S110)
Next, in step S110, the control unit 50 calculates the final feed amount c. The final feed amount c corresponds to a value obtained by subtracting the total feed amount “b × (i-1) −bp” of the feed amount already transported from the bag length L.

(Step S111)
Next, in step S111, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with the feed amount c.

(Step S112)
Next, in step S112, the control unit 50 stores the feed amount carried out in step S11 via the storage unit 51 as the final feed amount bp.

By repeating the processes of steps S101 to S112 in this way, the amount of overlap between the front and rear (upper and lower) vertical seal portions is always maintained constant (here, ab), and the same location is formed. The situation of vertical sealing three times is also prevented.

(5) Features of the first embodiment (5-1)
In the bag making and packaging machine 100, among a plurality of intermittent transports for obtaining a transport distance equivalent to one bag, the "feed amount of one transport before the final round" is a preset fixed amount. Therefore, if the "feed amount of the final transport" is the same as the "feed amount of the previous feed", a situation occurs in which the same portion is vertically sealed three times even if the vertical sealing means 20 is operated. However, other than that, the operation of the vertical sealing member is made to stand by to prevent the situation where the same place is vertically sealed three times.

(5-2)
In the bag making and packaging machine 100, the "feed amount of the final transport" is adjusted in order to avoid a situation in which the same place is vertically sealed three times, and the next "feed of the first transport" is adjusted. The "amount" is also adjusted in relation to the "feed amount of the final transport". Therefore, there is no problem even if each feed amount is a constant amount from the second transport to the "transport before the final feed".

(5-3)
In the bag making and packaging machine 100, when the "feed amount of the final transport" is less than a certain amount, the feed amount corresponding to the shortage is referred to as the "feed amount of the first transport" of the next bag. By doing so, the vertical sealing is performed after waiting for the feed amount to reach a certain amount, so that it is possible to prevent a situation in which the same portion is vertically sealed three times.

<Second Embodiment>
Some films used for bags have registration marks printed at predetermined intervals, and when making a bag using a film with a registration mark, the registration mark is located at a predetermined position (for example, in the center) of the bag. The film is conveyed and controlled so as to do so. Here, a part different from the transport control of the first embodiment will be described.

FIG. 10 is a block diagram of the control system of the bag making / packaging machine 100 according to the second embodiment of the present invention. In FIG. 10, a registration mark detection sensor 60 is connected to the control unit 50. Other configurations are the same as those of the first embodiment.

(1) Operation of the bag making / packaging machine 100 First, as a premise, in the transport control of the film of the bag with the registration mark, the control unit 50 receives a signal from the registration mark detection sensor 60 (hereinafter referred to as a registration mark detection signal). At that point, the film is conveyed at a predetermined feed amount bpf, and the transfer for one bag is completed.

11A, 11B and 11C are control flowcharts of the bag making and packaging machine 100, FIG. 11A shows steps S61 to S69, and FIG. 11B shows steps S71 to S75B. Further, FIG. 11C shows steps S81 to S89B. Hereinafter, the operation of the bag making / packaging machine 100 will be described with reference to FIGS. 11A, 11B and 11C.

(1-1) Explanation of FIG. 11A (start)
The control unit 50 operates by turning on the start switch (not shown) of the bag making / packaging machine 100 or receiving the product input signal as a trigger.

(Step S61)
In step S61, the control unit 50 sets the transport conditions for forming the full vertical seal portion for the desired bag length via the feed amount setting unit 52.

First, the feed amount setting unit 52 determines the desired bag length L, the length a of the vertical sealing means 20, the overlap length r, the reference feed amount b, and the registration mark, based on various numerical values input from the operator. The predetermined feed amount bpf of is set.

In addition, there is a relationship between the length a of the vertical sealing means 20> the reference feed amount b, and the overlap length r is inevitably set to r = ab.

(Step S62)
Next, in step S62, the control unit 50 reads the final feed amount bp of the bag from the storage unit 51.

(Step S63)
Next, in step S63, the control unit 50 controls the horizontal sealing means 40 to form the horizontal sealing unit.

(Step S64)
Next, in step S64, the control unit 50 determines whether or not the final feed amount bp of the previous bag is b, proceeds to step S65A when bp = b, and proceeds to step S65A when bp = b. Proceed to step S65B.

(Step S65A)
Next, in step S65A, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with the reference feed amount b.

(Step S65B)
Further, when the control unit 50 proceeds to step S65B, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and the transfer amount is b-bp, and the cylindrical body Tu is conveyed downward.

For example, when the reference feed amount b = 65 mm and the final feed amount bp = 60, the tubular body Tu is conveyed with a feed amount of “65-50 = 5” mm in this step S65B.

(Step S66)
Next, in step S66, the control unit 50 determines the presence / absence of the registration mark detection signal. The control unit 50 receives the registration mark detection signal from the registration mark detection sensor 60. The control unit 50 proceeds to step S67 when it is determined that "there is a registration mark detection signal", and proceeds to step S68 when it is not determined that "there is a registration mark detection signal".

(Step S67)
Next, in step S67, the control unit 50 stores the feed amount by from the time of the previous transfer to the time when the registration mark detection signal is received. For example, when the registration mark detection signal is received when 10 mm is conveyed after the previous transfer, it is stored as "by = 10 mm".

The control unit 50 proceeds to step S71 after performing the process of step S67.

(Step S68)
On the other hand, when the control unit 50 proceeds to step S68, it determines whether or not the feed is completed, and when the feed is completed, the control unit 50 proceeds to step S69.

(Step S69)
Next, in step S69, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

Specifically, the control unit 50 controls the heater drive device 22 to move the heater 21 from the standby position to the seal position. Then, the control unit 50 heat-melts the overlapping portion W by the heater 21 for a predetermined time. At this time, the transport means 30 is stopped.

Further, the control unit 50 moves the heater 21 from the seal position to the standby position after the vertical seal. At this time as well, the transport means 30 is stopped.

The control unit 50 cools the vertically sealed unit in the molten state for a predetermined cooling time after the heater 21 moves to the standby position.

After processing in step S69, the control unit 50 returns to step S65A.

(1-2) Explanation of FIG. 11B (step S71)
Next, in step S71, the control unit 50 has "by + bpf" which is the total of the feed amount by from the time of the previous transfer to the reception of the registration mark detection signal and the predetermined feed amount bpf after the registration mark is detected. It is determined whether or not the feed amount is equal to or less than the reference feed amount b.

The control unit 50 proceeds to step S72 when it is determined that "by + bpf ≦ b", and proceeds to step S81 when it is determined that it is not "by + bpf ≦ b".

For example, when the predetermined feed amount bpf = 50 mm is preset and "by = 10 mm" is stored, by + bpf = 10 + 50 = 60 <b = 65, so the process proceeds to step S72.

On the other hand, for example, when the registration mark detection signal is received when 20 mm is conveyed after the previous transfer, "by = 20 mm" is stored in step S67, so the predetermined feed amount bpf = 50 mm is set in advance. If so, since by + bpf = 20 + 50 = 70> b = 65, the process proceeds to step S81.

(Step S72)
Next, in step S72, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a predetermined feed amount bpf.

For example, when the predetermined feed amount bpf = 50 mm is preset, the tubular body Tu is conveyed by 50 mm after the registration mark is detected.

(Step S73)
Next, in step S73, the control unit 50 determines whether or not "by + bpf = b", and if it is determined that "by + bpf = b", proceeds to step S74A, and is not "by + bpf = b". When it is determined, the process proceeds to step S74B.

(Step S74A)
Next, in step S74A, the control unit 50 stores the final feed amount bp as bp = b.

For example, when "by = 15" is stored in step S67 and the feed amount is bpf = 50 in step S72, the storage unit 51 becomes "by + bpf = 15 + 50 = 65 = b", so that bp = b. I remember.

(Step S74B)
Next, in step S74B, the control unit 50 is the sum of the feed amount by from the time of the previous transfer to the reception of the registration mark detection signal via the storage unit 51 and the predetermined feed amount bpf after the registration mark is detected. "By + bpf" is stored as the final feed amount bp.

For example, when "by = 10" is stored in step S67 and the feed amount is bpf = 50 in step S72, the storage unit 51 stores "bp = by + bpf = 10 + 50 = 60".

(Step S75A)
Next, in step S75A, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

That is, since it is determined in the previous step S73 that "by + bpf = b", it means that the vehicle has been transported with the reference feed amount b, and vertical sealing can be performed.

(Step S75B)
On the other hand, when the control unit 50 proceeds to step S75B, the vertical sealing means 20 is made to stand by without forming the vertical sealing by the vertical sealing means 20.

This is because when the final feed amount bp is shorter than the reference feed amount b, the formation of the vertical seal is postponed, and the next feed amount is "b-bp", so that the total feed amount is set to the reference feed amount b. This is to make them equivalent.

(1-3) Explanation of FIG. 11C (step S81)
From here, the case where the control unit 50 determines in step S71 that it is not “by + bpf ≦ b” and proceeds to step S81 will be described.

In step S81, the control unit 50 initializes to "k = 0" in preparation for counting the number of vertical seals k after the registration mark is detected.

(Step S82)
Next, in step S82, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a feed amount by.

Originally, it is transported with the predetermined feed amount bpf after the registration mark is detected, but since by + bpf> b, when the tubular body Tu is transported with the predetermined feed amount bpf, the reference feed is performed after the previous transport. In the case of by + bpf> b, the tubular body Tu is not the predetermined feed amount bpf, even after the range mark is detected, because it is transported in excess of the amount b and a portion that is not vertically sealed occurs. , It is conveyed by the feed amount by-by.

For example, when the registration mark detection signal is received when 20 mm is transported after the previous transport, “by = 20 mm” is stored in step S67, so that the feed amount is 65-20 = 45.

That is, the tubular body Tu is conveyed 20 mm before receiving the registration mark detection signal and 45 mm after receiving the registration mark detection signal, so that a total of 65 mm is conveyed. This is equivalent to feeding with a reference feed amount b = 65 mm.

(Step S83)
Next, in step S83, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

That is, as a result of the tubular body Tu being conveyed 20 mm before receiving the registration mark detection signal and being conveyed 45 mm after receiving the registration mark detection signal, the tubular body Tu is completely fed at 65 mm, which is the same as the reference feed amount b. The seal was carried out.

(Step S84)
Next, in step S84, the control unit 50 updates the number of vertical seals k to "k = k + 1". This is because the vertical seal was previously performed once in step S83.

(Step S85)
Next, in step S85, the control unit 50 determines whether or not “by + bpf−k × b ≦ b”.

For example, if the reference feed amount b = 65 mm, by = 20 mm, bpf = 50 mm, and there is a vertical seal k = 1 time after the registration mark is detected, “20 + 50-1 × 65 = 5 <65”, and step S86A. Proceed to.

(Step S86A)
Then, in step S86A, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a feed amount by + bpf-k × b.

For example, when a registration mark detection signal is received when 20 mm is conveyed after the previous transfer, "by = 20 mm" is stored in step S67, and the control unit 50 feeds by + bpf-b = 20 + 50-65 =. In 5, the tubular body Tu is conveyed.

(Step S86B)
On the other hand, when the control unit 50 advances to step S86B, in the step S86B, the control unit 50 conveys the tubular body Tu downward with the reference feed amount b. Then, the control unit 50 returns to step S83.

(Step S87)
Next, in step S87, the control unit 50 determines whether or not "by + bpf-k x b = b", and if it is determined that "by + bpf-k x b = b", the process proceeds to step S88A. , When it is determined that it is not "by + bpf-k x b = b", the process proceeds to step S88B.

(Step S88A)
Next, in step S88A, the control unit 50 stores the final feed amount bp as bp = b.

(Step S88B)
Next, in step S88B, the control unit 50 stores the final feed amount bp as bp = by + bpf-k × b.

(Step S89A)
Next, in step S89A, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

(Step S89B)
On the other hand, when the control unit 50 proceeds to step S89B, the vertical sealing means 20 is made to stand by without forming the vertical sealing by the vertical sealing means 20.

By repeating the processes of steps S61 to S89B in this way, the amount of overlap between the front and rear (upper and lower) vertical seal portions is always maintained constant (here, ab), and the same location is formed. The situation of vertical sealing three times is prevented.

(2) Modification Example of the Second Embodiment In the second embodiment, in principle, the vertical seal is performed and then the horizontal seal is performed, but here, a modification in which the vertical seal and the horizontal seal are performed at the same time will be described.

12A, 12B and 12C are control flowcharts of the bag making and packaging machine 100, FIG. 12A shows steps S161 to S169, and FIG. 12B shows steps S171 to S174B. Further, FIG. 12C shows steps S181 to S188B. Hereinafter, the operation of the bag making / packaging machine 100 will be described with reference to FIGS. 12A, 12B and 12C.

(2-1) Explanation of FIG. 12A (start)
The control unit 50 operates by turning on the start switch (not shown) of the bag making / packaging machine 100 or receiving the product input signal as a trigger.

(Step S161)
In step S161, the control unit 50 sets the transport conditions for forming the full vertical seal portion for a desired bag length via the feed amount setting unit 52.

First, the feed amount setting unit 52 determines the desired bag length L, the length a of the vertical sealing means 20, the overlap length r, the reference feed amount b, and the registration mark, based on various numerical values input from the operator. The predetermined feed amount bpf of is set.

In addition, there is a relationship between the length a of the vertical sealing means 20> the reference feed amount b, and the overlap length r is inevitably set to r = ab.

(Step S162)
Next, in step S162, the control unit 50 reads the final feed amount bp of the bag from the storage unit 51.

(Step S163)
Next, in step S163, the control unit 50 determines whether or not the previous final feed amount bp is equal to the reference feed amount b, and if it is determined that "bp = b", the process proceeds to step S164A. If it is determined that "bp = b" is not satisfied, the process proceeds to step S164B.

(Step S164A)
Next, in step S164A, the control unit 50 controls the vertical sealing means 20 and the horizontal sealing means 40 to simultaneously form the vertical sealing portion and the horizontal sealing portion. The ability can be improved by performing the vertical seal and the horizontal seal at the same time. After the process of step S164A, the control unit 50 proceeds to step S165A.

(Step S164B)
On the other hand, when the control unit 50 proceeds to step S164B, the control unit 50 makes the vertical seal means 20 stand by without forming the vertical seal by the vertical seal means 20, and controls the horizontal seal means 40 to perform the horizontal seal. Form a part.

Here, the formation of the vertical seal is postponed, and then the feed amount is "b-bp", so that the total feed amount is set to the predetermined feed amount b.

(Step S165A)
Next, in step S165A, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with the reference feed amount b.

(Step S165B)
Further, when the control unit 50 proceeds to step S165B, the control unit 50 controls the transfer means 30 via the transfer means control unit 53, and conveys the tubular body Tu downward with a feed amount b-bp.

(Step S166)
Next, in step S166, the control unit 50 determines the presence / absence of the registration mark detection signal. The control unit 50 receives the registration mark detection signal from the registration mark detection sensor 60. The control unit 50 proceeds to step S167 when it is determined that "there is a registration mark detection signal", and proceeds to step S168 when it is not determined that "there is a registration mark detection signal".

(Step S167)
Next, in step S167, the control unit 50 stores the feed amount by from the time of the previous transfer to the time when the registration mark detection signal is received. For example, when the registration mark detection signal is received when 10 mm is conveyed after the previous transfer, it is stored as "by = 10 mm".

The control unit 50 proceeds to step S171 after performing the process of step S167.

(Step S168)
On the other hand, when the control unit 50 proceeds to step S168, it determines whether or not the feed is completed, and when the feed is completed, the control unit 50 proceeds to step S169.

(Step S169)
Next, in step S169, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

Specifically, the control unit 50 controls the heater drive device 22 to move the heater 21 from the standby position to the seal position. Then, the control unit 50 heat-melts the overlapping portion W by the heater 21 for a predetermined time. At this time, the transport means 30 is stopped.

Further, the control unit 50 moves the heater 21 from the seal position to the standby position after the vertical seal. At this time as well, the transport means 30 is stopped.

The control unit 50 cools the vertically sealed unit in the molten state for a predetermined cooling time after the heater 21 moves to the standby position.

After processing in step S169, the control unit 50 returns to step S165A.

(2-2) Explanation of FIG. 12B (step S171)
Next, in step S171, the control unit 50 has "by + bpf" which is the total of the feed amount by from the time of the previous transfer to the reception of the registration mark detection signal and the predetermined feed amount bpf after the registration mark is detected. It is determined whether or not the feed amount is equal to or less than the reference feed amount b.

The control unit 50 proceeds to step S172 when it is determined that "by + bpf ≦ b", and proceeds to step S181 when it is determined that it is not "by + bpf ≦ b".

For example, when the predetermined feed amount bpf = 50 mm is preset and "by = 10 mm" is stored, by + bpf = 10 + 50 = 60 <b = 65, so the process proceeds to step S172.

On the other hand, for example, when the registration mark detection signal is received when 20 mm is conveyed after the previous transfer, "by = 20 mm" is stored in step S167, so the predetermined feed amount bpf = 50 mm is set in advance. If so, since by + bpf = 20 + 50 = 70> b = 65, the process proceeds to step S181.

(Step S172)
Next, in step S172, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a predetermined feed amount bpf.

For example, when the predetermined feed amount bpf = 50 mm is preset, the tubular body Tu is conveyed by 50 mm after the registration mark is detected.

(Step S173)
Next, in step S173, the control unit 50 determines whether or not "by + bpf = b", and when it is determined that "by + bpf = b", the process proceeds to step S174A, which is not "by + bpf = b". When it is determined, the process proceeds to step S174B.

(Step S174A)
Next, in step S174A, the control unit 50 stores the final feed amount bp as bp = b.

For example, when "by = 15" is stored in step S167 and the feed amount is bpf = 50 in step S172, the storage unit 51 becomes "by + bpf = 15 + 50 = 65 = b", so that bp = b. I remember.

(Step S174B)
Next, in step S174B, the control unit 50 is the sum of the feed amount by from the time of the previous transfer to the reception of the registration mark detection signal via the storage unit 51 and the predetermined feed amount bpf after the registration mark detection. "By + bpf" is stored as the final feed amount bp.

For example, when "by = 10" is stored in step S167 and the feed amount is bpf = 50 in step S172, the storage unit 51 stores "bp = by + bpf = 10 + 50 = 60".

(2-3) Explanation of FIG. 12C (step S181)
From here, the case where the control unit 50 determines in step S171 above that it is not “by + bpf ≦ b” and proceeds to step S181 will be described.

In step S181, the control unit 50 initializes to "k = 0" in preparation for counting the number of vertical seals k after the registration mark is detected.

(Step S182)
Next, in step S182, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a feed amount by.

Originally, it is transported with the predetermined feed amount bpf after the registration mark is detected, but since by + bpf> b, when the tubular body Tu is transported with the predetermined feed amount bpf, the reference feed is performed from the previous transport. In the case of by + bpf> b, the tubular body Tu is not the predetermined feed amount bpf, even after the range mark is detected, because it is transported in excess of the amount b and a portion that is not vertically sealed occurs. , It is conveyed by the feed amount by-by.

For example, when the registration mark detection signal is received when 20 mm is conveyed after the previous transfer, “by = 20 mm” is stored in step S167, so the transfer amount is 65-20 = 45.

That is, the tubular body Tu is conveyed 20 mm before receiving the registration mark detection signal and 45 mm after receiving the registration mark detection signal, so that a total of 65 mm is conveyed. This is equivalent to feeding with a reference feed amount b = 65 mm.

(Step S183)
Next, in step S183, the control unit 50 controls the vertical sealing means 20 to form the vertical sealing unit.

That is, as a result of the tubular body Tu being conveyed 20 mm before receiving the registration mark detection signal and being conveyed 45 mm after receiving the registration mark detection signal, the tubular body Tu is completely fed at 65 mm, which is the same as the reference feed amount b. The seal was carried out.

(Step S184)
Next, in step S184, the control unit 50 updates the number of vertical seals k to "k = k + 1". This is because the vertical seal was previously performed once in step S183.

(Step S185)
Next, in step S185, the control unit 50 determines whether or not “by + bpf−k × b ≦ b”. The control unit 50 proceeds to step S186A when it is determined that "by + bpf-k x b ≦ b", and proceeds to step S186B when it is determined that it is not "by + bpf-k x b ≦ b".

For example, if the reference feed amount b = 65 mm, by = 20 mm, bpf = 50 mm, and there is a vertical seal k = 1 time after the registration mark is detected, “20 + 50-1 × 65 = 5 <65”, and step S186A. Proceed to.

(Step S186A)
Then, in step S186A, the control unit 50 controls the transport means 30 via the transport means control unit 53, and transports the tubular body Tu downward with a feed amount by + bpf-k × b.

For example, when a registration mark detection signal is received when 20 mm is conveyed after the previous transfer, "by = 20 mm" is stored in step S167, and the control unit 50 feeds by + bpf-b = 20 + 50-65 =. In 5, the tubular body Tu is conveyed.

(Step S186B)
On the other hand, when the control unit 50 advances to step S186B, in the step S186B, the control unit 50 conveys the tubular body Tu downward with the reference feed amount b. Then, the control unit 50 returns to step S183.

(Step S187)
Next, in step S187, the control unit 50 determines whether or not "by + bpf-k x b = b", and if it is determined that "by + bpf-k x b = b", the process proceeds to step S188A. , When it is determined that it is not "by + bpf-k x b = b", the process proceeds to step S188B.

(Step S188A)
Next, in step S188A, the control unit 50 stores the final feed amount bp as bp = b.

(Step S188B)
Next, in step S188B, the control unit 50 stores the final feed amount bp as bp = by + bpf-k × b.

By repeating the processes of steps S161 to S188B in this way, the amount of overlap between the front and rear (upper and lower) vertical seal portions is always maintained constant (here, ab), and the same location is formed. The situation of vertical sealing three times is prevented.

(3) Features of the second embodiment (3-1)
In the bag making and packaging machine 100, the cash register mark needs to be stably located at a predetermined position on the bag. Therefore, the fact that the registration mark is detected means that the registration mark has reached a certain distance from the predetermined location. Therefore, by transporting the feed amount preset from the detection, the cash register mark is stably positioned at a predetermined position on the bag.

(3-2)
In the bag making and packaging machine 100, each feed amount is a constant amount from the second transport to the first transport including the registration mark detection.

(3-3)
In the bag making and packaging machine 100, when the "feed amount of the final transport" is less than a certain amount, the feed amount corresponding to the shortage is referred to as the "feed amount of the first transport" of the next bag. By doing so, the vertical sealing is performed after waiting for the feed amount to reach a certain amount, so that it is possible to prevent a situation in which the same portion is vertically sealed three times.

The bag-making and packaging machine is useful for bag-making by intermittent transportation because it avoids three vertical seals on the same area of the overlapping portion of the tubular films.

20 Vertical sealing means (vertical sealing member)
21 Heater (vertical seal member)
50 Control unit 60 Registration mark detection sensor (sensor)
100 Bag making and packaging machine Tu Cylindrical body (cylindrical film)
W overlapping part

Japanese Unexamined Patent Publication No. 2015-178376

Claims (7)

A film that is intermittently conveyed is wound along the outer periphery of the tubular member, and the ends of the films are overlapped along the conveying direction of the film to form a tubular film, and the tubular films are overlapped. It is a bag-making and packaging machine that performs vertical sealing on a part, puts a product in the tubular film, and performs horizontal sealing.
A control unit for controlling the vertical sealing member that performs the vertical sealing is provided.
The control unit has the vertical seal except when the feed amount of the final transport is the same as the preset reference feed amount among the plurality of intermittent transports for obtaining the transport distance corresponding to one bag. The operation of the vertical sealing member is made to stand by for the overlapping portion to be performed.
Bag making and packaging machine. From the second transport to the one before the final transport, each feed amount is a fixed amount.
The bag making and packaging machine according to claim 1. The control unit stores the feed amount of the final transfer, and stores the feed amount.
Further, the control unit sets the feed amount of the first transport of the next bag to an amount obtained by subtracting the feed amount of the final feed from the constant amount.
The bag making and packaging machine according to claim 2. Registration marks are printed on the film at predetermined intervals.
Further equipped with a sensor for detecting the registration mark,
After the registration mark is detected, the control unit conveys the film at a predetermined feed amount.
The bag making and packaging machine according to claim 1. Each feed amount is a constant amount from the second transport to the previous transport when the registration mark is detected .
The bag making and packaging machine according to claim 4. The control unit stores the feed amount of the final transfer, and stores the feed amount.
Further, the control unit sets the feed amount of the first transport of the next bag to an amount obtained by subtracting the feed amount of the final feed from the constant amount.
The bag making and packaging machine according to claim 5 . Avoiding the vertical sealing three times on the same area of the overlapping portion of the tubular film.
The bag-making and packaging machine according to any one of claims 1 to 6.

Images