Bag-making, filling and packaging machine

Abstract

To provide a bag-making, filling and packaging machine that is intended to prevent seal failures in vertical sealing by ultrasonic vibration.SOLUTION: A bag-making, filling and packaging machine includes: a vertical sealing device that clamps both ends of a packaging film at an ultrasonic sealing position between an ultrasonic horn and an anvil and forms a tubular packaging material by applying a vertical seal using ultrasonic vibrations; a packaging material feeding device that transports the tubular packaging material along its transport direction; a horizontal sealing device that applies a horizontal seal to the tubular packaging material after being filled with a packaged item; and a control unit that, when the transport of the tubular packaging material by the packaging material feeding device is stopped, stops the generation of ultrasonic vibrations in the vertical sealing device and transports the tubular packaging material in a reverse transport direction, which is the opposite direction to the transport direction, before stopping the tubular packaging material, and when the transport is to be resumed, resumes the generation of ultrasonic vibrations and controls the packaging material feeding device to resume the transport of the tubular packaging material in the transport direction from the state after it was transported in the reverse transport direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bag-making and filling packaging machine.

Background Art

[0002] Conventionally, in a bag-making and filling packaging machine equipped with an ultrasonic horn and an anvil, a technique of performing a longitudinal seal by ultrasonic vibration is known. In the longitudinal seal by ultrasonic vibration, when the conveyance of the packaging material is stopped (standby state), the generation of ultrasonic waves stops, and when the conveyance resumes, the generation of ultrasonic waves resumes. However, since it takes time for the ultrasonic vibration in the ultrasonic horn to stabilize after the generation of ultrasonic waves is started, during this period, in the range of the packaging material that has passed through the longitudinal seal device, an appropriate seal is not made, and there is a possibility of seal failure. On the other hand, in the device of Patent Document 1, it is controlled so that a transverse seal is applied to the range of the packaging material that has passed through the longitudinal seal device during the time until the ultrasonic vibration stabilizes. Further, Patent Document 2 discloses a technique of moving the longitudinal seal device backward with respect to the range that has been softened but not pressurized when stopped, in a device that softens the polymerized portion with a longitudinal sealer and applies a longitudinal seal by pressurizing with a press roller.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a longitudinal seal device that performs a longitudinal seal by ultrasonic vibration, in the technique of Patent Document 1, it is necessary to apply a transverse seal to the range where the longitudinal seal is unstable, and there has been a desire to appropriately apply a longitudinal seal without such a limitation.

[0005] The present invention has been made in view of such problems, and an object thereof is to prevent seal defects in longitudinal sealing by ultrasonic vibration.

Means for Solving the Problems

[0006] The present invention is a bag-making, filling, and packaging machine, comprising: a longitudinal sealing device that forms a tubular packaging material by sandwiching both ends of a packaging film at an ultrasonic sealing position between an ultrasonic horn and an anvil and performing longitudinal sealing by ultrasonic vibration; a packaging material feeding device that conveys the tubular packaging material along the conveyance direction of the tubular packaging material; a transverse sealing device that performs transverse sealing on the tubular packaging material filled with a material to be packaged; and a control unit that, when stopping the conveyance of the tubular packaging material by the packaging material feeding device, stops the generation of ultrasonic vibration in the longitudinal sealing device and conveys the tubular packaging material in a reverse conveyance direction, which is the direction opposite to the conveyance direction, before stopping the tubular packaging material, and when restarting the conveyance, restarts the generation of ultrasonic vibration and controls the packaging material feeding device to restart the conveyance of the tubular packaging material in the conveyance direction from the state after being conveyed in the reverse conveyance direction.

Effects of the Invention

[0007] According to the present invention, it is possible to prevent seal defects in longitudinal sealing by ultrasonic vibration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0009] FIG. 1 is a perspective view showing the overall configuration of the bag-making and filling packaging machine 1. FIG. 2 is a front view showing the former, the filling cylinder, and the longitudinal seal device used in the bag-making and filling packaging machine 1 shown in FIG. 1. In the present embodiment, the bag-making and filling packaging machine 1 is a vertical bag-making and filling packaging machine in which the filling cylinder is installed so that the longitudinal direction of the filling cylinder is parallel to the gravitational direction, and the product (material to be packaged) to be packaged is introduced through the filling cylinder, and a bag is made from the packaging material while the bag is filled with the material to be packaged to manufacture a bag package. Further, the bag-making and filling packaging machine 1 of the present embodiment is a so-called continuous machine in which when the operation is started, the conveyance of the packaging material is started, and then the packaging material is continuously conveyed. However, as another example, the bag-making and filling packaging machine 1 may be a so-called intermittent machine in which the conveyance of the packaging material is intermittently performed by temporarily stopping the conveyance when forming the bag package.

[0010] Hereinafter, in the process of manufacturing the bag package, the direction in which the packaging material is conveyed is referred to as the conveyance direction, and the direction opposite to the conveyance direction is referred to as the reverse conveyance direction. Also, in the conveyance path of the packaging material, the direction ahead in the conveyance direction is referred to as the front, and the opposite side of the front is referred to as the rear.

[0011] In the bag-making and filling packaging machine 1 shown in Fig. 1, there are a take-up roll Fr around which a strip-shaped packaging material Fw is wound in a roll shape, a feeding mechanism 10 that feeds out the strip-shaped packaging material Fw from the take-up roll Fr, stores a part of it, and applies an appropriate tension, an accessory device 20 such as a printing device that performs printing on the strip-shaped packaging material Fw, a former 30 that bends the continuously fed strip-shaped packaging material Fw into a substantially cylindrical packaging material, a longitudinal sealing device 60 that applies a longitudinal seal to the packaging material bent into a substantially cylindrical packaging material to form a cylindrical packaging material Ft, a transverse sealing device 40 that applies a seal in the transverse direction to the cylindrical packaging material Ft formed by applying the longitudinal seal, a filling cylinder 50 that is inserted into the former 30 and into which the material to be packaged is loaded, and a suction-type packaging material feeding device 70 that feeds the cylindrical packaging material Ft like paper.

[0012] As shown in Fig. 1, the packaging material feeding device 70 is a suction paper feeding device that feeds the cylindrical packaging material Ft in the conveying direction while sucking it from the outside. Specifically, the packaging material feeding device 70 includes two paper feeding belts 71a and 71b that are arranged to face each other on both sides in the diameter direction of the cylindrical packaging material Ft. A plurality of suction holes 72 that are arranged in a row in the longitudinal direction are formed at the center in the width direction of each paper feeding belt 71a and 71b. Each paper feeding belt 71a and 71b is wound around a drive pulley 73, a driven pulley 74, and a guide pulley 75 that are driven by a motor. A suction means (not shown) sucks air through the suction holes 72. By the driving force from the drive pulley 73, the cylindrical packaging material Ft that contacts the paper feeding belts 71a and 71b is sucked from the outside, and the cylindrical packaging material Ft is conveyed downward along the direction of gravity. As the conveyed cylindrical packaging material Ft moves relative to the longitudinal sealing device 60, the edge portions Fea and Feb on both sides of the cylindrical packaging material Ft are continuously sealed as a longitudinal seal Sc.

[0013] As shown particularly in FIG. 2, the former 30 includes a sealer portion 31 that bends the strip-shaped packaging material Fw into a substantially cylindrical shape, and a cylindrical portion 32 that is connected to the sealer portion 31 and through which the strip-shaped packaging material Fw bent into a substantially cylindrical shape passes inside. The sealer portion 31 has a curved sealer body 33 that acts on the strip-shaped packaging material Fw to bend it into a substantially cylindrical shape, and an overlapping portion 34. The overlapping portion 34 is formed at the tip edge portions 34a and 34b of the sealer body 33 that face each other. The edge portions Fea and Feb on both sides of the strip-shaped packaging material Fw are overlapped when passing through the overlapping portion 34. The sealer body 33 wraps around the periphery of the cylindrical portion 32 in a smooth curved surface shape from the back side to the front side, and the overlapping portion 34 is formed at the lower front end of the sealer body 33.

[0014] The cylindrical portion 32 includes a cylindrical main body 35 that extends downward in a cylindrical form from the overlapping portion 34 of the sealer portion 31 and terminates at the lower end 36. A slit 37 is formed in the cylindrical main body 35 so as to be connected to the overlapping portion 34 and extend vertically, and through which the overlapped edge portions Fea and Feb can pass in a state where they protrude to the front side.

[0015] The filling cylinder 50 fitted inside the former 30 is a cylindrical body made of metal (stainless steel). The filling cylinder 50 is fitted inside the cylindrical portion 32 of the former 30 with a gap 51 therebetween, and the strip-shaped packaging material Fw can pass through the gap 51 between the inner peripheral surface of the cylindrical portion 32 and the outer peripheral surface of the filling cylinder 50. In the example shown in FIG. 2, the filling cylinder 50 extends further downward from the lower end 36 of the cylindrical portion 32 of the former 30.

[0016] The longitudinal sealing device 60 is disposed at a position directly below the overlapping portion 34 of the former 30. The longitudinal sealing device 60 according to the present embodiment is an ultrasonic longitudinal sealing device including an ultrasonic horn 61, an ultrasonic generator 62, and an anvil 64. The ultrasonic horn 61, the ultrasonic generator 62, and the anvil 64 are unitized as an ultrasonic sealing unit. The strip-shaped packaging material Fw is conveyed from the former 30 to the longitudinal sealing device 60 with its edge portions Fea, Feb sandwiched between the slits 37. The longitudinal sealing device 60 presses and vibrates the edge portions Fea, Feb of the strip-shaped packaging material Fw to melt and weld them. In this way, a longitudinal seal Sc is applied to the strip-shaped packaging material Fw by ultrasonic waves, and a tubular packaging material Ft is formed. Hereinafter, the process of the longitudinal sealing device 60 applying the longitudinal seal Sc to the strip-shaped packaging material Fw is referred to as ultrasonic longitudinal sealing.

[0017] The ultrasonic horn 61 and the anvil 64 are made of metal and provided in a disc shape, and are arranged such that their side surfaces face each other. The edge portions Fea, Feb of the strip-shaped packaging material Fw are sandwiched between the ultrasonic horn 61 and the anvil 64. The ultrasonic generator 62 is provided on the surface of the disc of the ultrasonic horn 61 opposite to the surface on the strip-shaped packaging material Fw side. In the ultrasonic generator 62, high-frequency electrical energy is converted into mechanical vibration energy by a converter composed of a piezoelectric element, and the mechanical vibration energy is amplified by a booster. Then, ultrasonic vibration is transmitted toward the anvil 64 through a resonator called the ultrasonic horn 61. The edge portions Fea, Feb on both sides sandwiched in a pressurized state between the ultrasonic horn 61 and the anvil 64 are melt-welded by the frictional heat generated due to rubbing against their interface by the vibration energy transmitted to the ultrasonic horn 61. Note that as the longitudinal sealing device 60 according to the present embodiment, a roller-type device is used, but it is not limited thereto, and a block-type device may be used.

[0018] As shown in Fig. 1, the horizontal sealing device 40 includes two horizontally opposed heat seal bars 41a and 41b. By applying pressure and heat to the tubular packaging material Ft between both horizontal heat seal bars 41a and 41b, a transverse seal (horizontal seal Se) is formed to seal the upper opening of the previously formed bag P1 and to form the bottom of the subsequent bag P2. Similar to a conventional packaging machine, a cutter device 45 is incorporated into the horizontal sealing device 40. As the cutter device 45, a cutter blade 46 is incorporated into one of the horizontal heat seal bars 41 so as to be retractable, and a groove 47 into which the advanced cutter blade 46 enters is formed in the other horizontal heat seal bar 41 to cut the sandwiched tubular packaging material Ft.

[0019] Above the bag-making and filling packaging machine 1, a weighing machine 100 for the material to be packaged is installed. The weighing machine 100 weighs the material to be packaged filled in one bag and supplies the weighed material to be packaged into the filling cylinder 50 of the bag-making and filling packaging machine 1. The supplied material to be packaged passes through the filling cylinder 50, enters the bag, and is sealed by the longitudinal seal Sc and the horizontal seal Se.

[0020] Fig. 3 is a diagram for explaining the control of the operations of the bag-making and filling packaging machine 1 and the weighing machine 100 of the present embodiment. The bag-making and filling packaging machine 1 includes a first control unit 210 that controls the operations of each part. The weighing machine 100 includes a second control unit 220 that controls the operations of each part.

[0021] As control for filling the material to be packaged, first, the first control unit 210 of the bag-making and filling packaging machine 1 sends a drop request signal (REQ) to the second control unit 220 of the weighing machine 100 (1). Here, the drop request signal is information requesting the drop (supply) of the material to be packaged, and when the weighing machine 100 receives this drop request signal, it drops the material to be packaged enclosed in one bag.

[0022] If the second control unit 220 of the weighing machine 100 can supply the material to be packaged, it supplies the material to be packaged by dropping it into the filling cylinder 50 of the bag-making and filling packaging machine 1 in response to the dropping request signal (2). Then, the second control unit 220 responds to the dropping request signal by transmitting a dropping completion signal (ACK) (3). The first control unit 210 of the bag-making and filling packaging machine 1 confirms that the supply of the material to be packaged has been completed normally by receiving the dropping completion signal, and continues the conveyance of the tubular packaging material Ft.

[0023] On the other hand, if the second control unit 220 of the weighing machine 100 cannot supply the material to be packaged, such as when there is a shortage of the material to be packaged, it does not transmit the dropping completion signal. In contrast, when the first control unit 210 of the bag-making and filling packaging machine 1 does not receive the dropping completion signal (there is no response), it stops the conveyance of the tubular packaging material Ft by the packaging material feeding device 70 and the ultrasonic longitudinal seal, and waits until the material to be packaged is supplied. When the supply of the material to be packaged becomes possible, the second control unit 220 of the weighing machine 100 transmits the dropping completion signal again, and when the first control unit 210 of the bag-making and filling packaging machine 1 receives the dropping completion signal, it resumes the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal.

[0024] Figure 4 is a diagram showing the timing chart of the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal. The horizontal axis is the time axis. As shown in Figure 4, when the bag-making and filling packaging machine 1 starts operating, the bag-making and filling packaging machine 1 starts transmitting the dropping request signal. Thereafter, the dropping request signal is transmitted periodically at regular intervals (w1). Further, at the start of operation, the conveyance of the packaging material and the ultrasonic longitudinal seal are started, and thereafter, the conveyance of the packaging material and the ultrasonic longitudinal seal continue.

[0025] FIG. 5 is an explanatory diagram of a state in which the bag-making and filling packaging machine 1 stops the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal in response to not receiving a drop completion signal. The horizontal axis in FIG. 5 is the time axis, and the vertical direction (downward in the drawing) is the conveyance direction D1 of the tubular packaging material Ft. As described above, the bag-making and filling packaging machine 1 periodically transmits a drop request signal at intervals of period w1. Therefore, while the normal operation of the weighing machine 100 is being performed, the bag-making and filling packaging machine 1 periodically receives a drop completion signal at intervals of period w1. However, when the packaging material cannot be supplied to the weighing machine 100, the drop completion signal is not transmitted, and the bag-making and filling packaging machine 1 does not receive the drop completion signal.

[0026] As shown in FIG. 5, it is assumed that the bag-making and filling packaging machine 1 transmitted a drop request signal at timing t1 but could not receive a drop completion signal immediately thereafter. Further, it is assumed that a drop completion signal was received at timing t2 after the reception of the drop completion signal was interrupted for a certain period. Such a case will be described.

[0027] First, at timing t1, when the bag-making and filling packaging machine 1 does not receive a drop completion signal in response to the transmission of the drop request signal, the first control unit 210 stops the packaging material feeding device 70 and the longitudinal seal device 60. At this time, as shown in FIG. 5(1), in the tubular packaging material Ft, ultrasonic longitudinal sealing has been performed up to the position B1 in the longitudinal direction. Here, the position B1 is a position facing the ultrasonic longitudinal seal position (ultrasonic seal position). The ultrasonic longitudinal seal position is the position where ultrasonic longitudinal sealing is performed by the longitudinal seal device 60. Also, the range A1 in front of the position B1 in the tubular packaging material Ft is the range where ultrasonic longitudinal sealing has been performed.

[0028] Thereafter, the first control unit 210 continues the state of stopping the conveyance of the tubular packaging material Ft until it receives a drop completion signal for the drop request signal. Then, when the first control unit 210 receives a drop completion signal for the drop request signal at timing t2, as shown in FIG. 5(2), it resumes the conveyance of the tubular packaging material Ft along the conveyance direction D1.

[0029] In the longitudinal sealing device 60 which is an ultrasonic sealing device, at this timing t2, the generation of ultrasonic waves is instructed from the first control unit 210. The ultrasonic wave generation unit 62 starts the generation of ultrasonic waves in accordance with this instruction for the generation of ultrasonic waves. However, as described above, after the ultrasonic waves are generated by the ultrasonic wave generation unit 62, it takes a certain amount of time until the ultrasonic waves are transmitted to the ultrasonic horn 61 and the anvil 64 and the vibration energy is stably transmitted to the tubular packaging material Ft. For this reason, as shown in FIG. 5(3), the start of stable ultrasonic longitudinal sealing occurs at a timing t3 after the timing t2.

[0030] On the other hand, the conveyance of the tubular packaging material Ft by the packaging material feeding device 70 has already started at the timing t2. For this reason, at the timing of t3, the position B1 of the tubular packaging material Ft is conveyed forward of the ultrasonic longitudinal sealing position, and at the ultrasonic longitudinal sealing position, the position B2 behind the position B1 is located. Since the range A2 between the position B1 and the position B2 has passed through the ultrasonic longitudinal sealing position before the vibration energy is stably transmitted to the ultrasonic horn 61 and the anvil 64, the ultrasonic longitudinal sealing is not properly performed, and there is a possibility of seal failure.

[0031] In contrast, the bag-making and filling packaging machine 1 of the present embodiment performs control so that such a range of seal failure where ultrasonic longitudinal sealing may be unstable does not occur. Such control will be described with reference to FIGS. 6, 7, and 8.

[0032] FIG. 6 is a flowchart showing the operation control by the bag-making and filling packaging machine 1. FIG. 7 is a diagram showing the conveyance of the tubular packaging material Ft and the timing chart of ultrasonic longitudinal sealing in the operation control. FIG. 8 is a diagram for explaining the operation control. As shown in FIG. 6, the first control unit 210 of the bag-making and filling packaging machine 1 first transmits a dropping request signal to the weighing machine 100 (step S100). When the weighing machine 100 receives the dropping request signal, it supplies the material to be packaged to the filling cylinder 50 of the bag-making and filling packaging machine 1 by dropping the material to be packaged.

[0033] Then, when the weighing machine 100 finishes dropping, i.e., supplying, the packaging material to be packed, it transmits a drop completion signal to the bag-making and filling packaging machine 1. When the first control unit 210 receives the drop completion signal from the weighing machine 100 (Y in step S102), it starts the conveyance of the tubular packaging material Ft by the packaging material feeding device 70 and the ultrasonic longitudinal seal by the longitudinal seal device 60 (steps S104 and S106). Thus, both the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal are executed upon receipt of the drop completion signal. Note that the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal are preferably executed simultaneously.

[0034] Thereafter, after a certain period of time (w1) has elapsed, the first control unit 210 advances the process to step S100. In this way, by repeating the processes after step S100, a drop request signal is periodically transmitted to the weighing machine 100. Further, in response to the above control, the bag-making and filling packaging machine 1 continues the bag-making operation.

[0035] On the other hand, if the first control unit 210 does not receive the drop completion signal from the weighing machine 100 (N in step S102), it checks whether standby processing has been performed (step S108). It is assumed that it is determined that the drop completion signal has not been received if the drop completion signal has not been received after a certain period of time since the drop request signal was transmitted. And if the drop completion signal has not been received, the bag-making and filling packaging machine 1 enters a standby state in which it does not perform the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal. The operation performed before entering this standby state is the standby processing. The standby processing will be described later.

[0036] If the standby process has already been performed (Y in step S108), the first control unit 210 performs the processes after step S100 after a certain time (w1) has elapsed. If the standby process has not been performed (N in step S108), the first control unit 210 performs the standby process (step S110). The standby process is a process of stopping the ultrasonic longitudinal seal by instructing the longitudinal seal device 60 to stop generating ultrasonic waves, transporting the tubular packaging material Ft a certain distance in the transport direction, then transporting it a certain distance in the reverse transport direction, and then stopping the transport of the tubular packaging material Ft. After the completion of the standby process (step S110), the first control unit 210 performs the processes after step S100 after a certain time (w1) has elapsed.

[0037] As shown in FIG. 7, when the bag-making and filling packaging machine 1 does not receive the drop completion signal, it transports the tubular packaging material Ft in the transport direction for a certain period, then transports it in the reverse transport direction, and then stops the transport. On the other hand, while the tubular packaging material Ft is being transported in the transport direction for a certain period, the bag-making and filling packaging machine 1 continues the ultrasonic longitudinal seal, and stops the ultrasonic longitudinal seal when transporting in the reverse transport direction.

[0038] As shown in FIG. 8(1), at timing t1, when the drop completion signal is not received in response to the transmission of the drop request signal, the first control unit 210 performs the standby process (S110). Specifically, the first control unit 210 transports the tubular packaging material Ft a certain distance in the transport direction D1 to the packaging material feeding device 70. Thereafter, the first control unit 210 stops the ultrasonic longitudinal seal of the longitudinal seal device 60. As a result, as shown in FIG. 8(2), the position B3 of the tubular packaging material Ft behind the position B1 faces the ultrasonic longitudinal seal position. At this time, the ultrasonic seal is applied to the range A3 from the position B1 to the position B3 of the tubular packaging material Ft. Here, the longitudinal distance H3 of the range A3 (the certain distance that the tubular packaging material Ft is transported in the transport direction D1) is assumed to be longer than the longitudinal distance H2 of the range (range A2) where the ultrasonic longitudinal seal may become unstable, which was described with reference to FIG. 5. As another example, the longitudinal distance of the range A3 may be equal to the longitudinal distance of the range A2.

[0039] Subsequently, the packaging material feeder 70 conveys the tubular packaging material Ft in the reverse conveyance direction D2 by a certain distance and then stops the conveyance of the tubular packaging material Ft. Here, the distance conveyed in the reverse conveyance direction D2 is the distance H3. That is, when stopping the conveyance of the tubular packaging material Ft, the distance conveyed in the conveyance direction D1 and the distance conveyed in the subsequent reverse conveyance direction D2 are equal. As a result, as shown in FIG. 8(3), the position B1 is located again at the ultrasonic longitudinal seal position, and a range A3 where the ultrasonic longitudinal seal has been appropriately applied extends behind it. The first control unit 210 waits in this state until it receives the drop completion signal. Note that the certain distance H3 conveyed in the reverse conveyance direction D2 may be longer than or equal to the longitudinal distance H2 of the range (range A2) where the ultrasonic longitudinal seal may become unstable.

[0040] As shown in FIG. 8(4), when the drop completion signal is received at timing t2 (Y in step S102), the first control unit 210 resumes the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal (steps S104, step S106). Note that at timing t2, the position B1 of the tubular packaging material Ft is located at the ultrasonic longitudinal seal position. Therefore, when the first control unit 210 receives the drop completion signal for the first time after executing the standby process (Y in step S102), the ultrasonic longitudinal seal starts from the position B1 of the tubular packaging material Ft. As described with reference to FIG. 5, the period from timing t2 to timing t3 is a period during which the ultrasonic longitudinal seal may become unstable, and during this period, the tubular packaging material Ft is conveyed in the conveyance direction D1 by a certain distance (the distance of range A2).

[0041] On the other hand, in the present embodiment, an ultrasonic longitudinal seal has already been applied to the range A3 behind the position B1 of the tubular packaging material Ft. Therefore, even for the range passing through the ultrasonic longitudinal seal position in a state where the ultrasonic longitudinal seal is unstable at the restart of conveyance, the ultrasonic longitudinal seal can be appropriately applied. Thus, the bag-making and filling packaging machine 1 of the present embodiment can prevent seal defects in the ultrasonic longitudinal seal by ultrasonic vibration.

[0042] Furthermore, as described above, each time a certain period (w1) elapses, the first control unit 210 transmits a drop request signal to the weigher 100. Then, a series of operations of conveying in the conveying direction D1 and then in the reverse conveying direction D2, as shown in FIGS. 8(1) to (3), are assumed to be completed before this certain period (w1) elapses. As a result, even when a drop completion signal is received as a response to the drop request signal transmitted immediately after it is determined that the drop completion signal has not been received, the conveyance of the tubular packaging material Ft and the ultrasonic longitudinal seal can be promptly resumed in response to the drop completion signal.

[0043] Also, in the bag-making and filling packaging machine 1 of the present embodiment, when the conveyance of the tubular packaging material Ft stops, it is conveyed in the conveying direction D1 before being conveyed in the reverse conveying direction D2. As a result, the stop position corresponding to the ultrasonic longitudinal seal position can be made to coincide with the position (position B1 in the embodiment) corresponding to the ultrasonic longitudinal seal position at the timing when it is determined that the drop completion signal cannot be received and the conveyance stops. That is, the stop position can be controlled.

[0044] Furthermore, in the bag-making and filling packaging machine 1 of the present embodiment, when the conveyance of the tubular packaging material Ft resumes, the tubular packaging material Ft is positioned so that a range A3 where the ultrasonic longitudinal seal has been applied is located behind the position B1 corresponding to the ultrasonic longitudinal seal position. As an operation for this, as described in the present embodiment, instead of moving the tubular packaging material Ft, it is also possible to move the longitudinal seal device 60 a certain distance in the reverse conveying direction D2 and then a certain distance in the conveying direction D1. However, when the longitudinal seal device 60 is moved in this way, more power is required. Therefore, in the bag-making and filling packaging machine 1 of the present embodiment, instead of moving the longitudinal seal device 60, the tubular packaging material Ft is moved. Thereby, power consumption can be suppressed. Also, the configuration of the bag-making and filling packaging machine 1 can be simplified.

[0045] Note that the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0046]

[0046] As a first modification example, when the measuring machine 100 cannot supply the packaging material, it may transmit a non-supply signal indicating that the packaging material cannot be supplied to the bag-making and filling packaging machine 1. In this case, in step S102 of the operation control, the bag-making and filling packaging machine 1 advances the process to step S104 when receiving the reception completion signal, and advances the process to step S108 when receiving the non-supply signal.

[0047] Also, as a second modification example, the first control unit 210 may determine that it is the timing to stop and resume the conveyance of the tubular packaging material Ft in response to the occurrence and elimination of malfunctions in the mechanism of the bag-making and filling packaging machine 1, respectively.

[0048] Also, as a third modification example, the first control unit 210 may not convey the tubular packaging material Ft in the conveyance direction D1 before conveying it in the reverse conveyance direction D2 when the conveyance of the tubular packaging material Ft stops. FIG. 9 is a diagram showing the conveyance of the tubular packaging material Ft and the timing chart of the ultrasonic longitudinal seal in the operation control according to this modification example. As shown in FIG. 9, when the bag-making and filling packaging machine 1 does not receive the drop completion signal, it immediately stops the ultrasonic longitudinal seal and conveys the tubular packaging material Ft in the reverse conveyance direction and then stops the conveyance. That is, the conveyance in the conveyance direction after determining that the drop completion signal has not been received is not performed. FIG. 10 is a diagram for explaining the operation control according to this modification example. As shown in FIG. 10(1), at timing t1, when the drop completion notification is not received, the packaging material feeder 70 immediately conveys the tubular packaging material Ft a certain distance in the reverse conveyance direction D2 without conveying it in the conveyance direction D1.

[0049] As a result, as shown in Fig. 10(2), the area A4 where ultrasonic vertical sealing has already been performed is located behind the position B4 facing the ultrasonic vertical sealing position, and the ultrasonic vertical sealing position is located at the position B4 of the tubular packaging material Ft, which is forward of the position B1. Therefore, as shown in Fig. 10(3), at the time t2 when the supply possible notification is received, ultrasonic vertical sealing is started from the position B4 of the tubular packaging material Ft. However, by the time t3 when the seal is stabilized, the area A4 that passes through the ultrasonic vertical sealing position has already been properly ultrasonically vertically sealed. Therefore, in this modified example, it is possible to prevent poor sealing in the vertical seal caused by ultrasonic vibration. [Explanation of symbols]

[0050] 1 Bag making, filling and packaging machine 10. Feeding mechanism 30 Forma 40 Horizontal sealing device 50 Filling cylinder 60 Vertical sealing device 61 Ultrasonic Horn 62 Ultrasonic generator 64 Anvil 70 Packaging material feeder 100 weighing machine 210 First Control Section 220 Second Control Section Fr Winding roll Fw Band packaging material Ft Tubular packaging material

Claims

1. A longitudinal sealing device that sandwiches both ends of a packaging film at an ultrasonic sealing position between an ultrasonic horn and an anvil and forms a tubular packaging material by applying a longitudinal seal by ultrasonic vibration; A packaging material feeding device that conveys the tubular packaging material along the conveying direction of the tubular packaging material; A transverse sealing device that applies a transverse seal to the tubular packaging material filled with the material to be packaged; When stopping the conveyance of the tubular packaging material by the packaging material feeding device, the generation of ultrasonic vibration in the longitudinal sealing device is stopped, and before stopping the tubular packaging material, it is conveyed in a reverse conveyance direction that is the opposite of the conveying direction. When restarting the conveyance of the tubular packaging material, the generation of ultrasonic vibration is restarted, and the packaging material feeding device is controlled to restart the conveyance of the tubular packaging material in the conveying direction from the state after being conveyed in the reverse conveyance direction. A control unit; A bag-making and filling packaging machine comprising:

2. The distance that the tubular packaging material is conveyed in the reverse conveyance direction is equal to or greater than the distance that the tubular packaging material is conveyed during the time from when the generation of ultrasonic vibration is restarted until the ultrasonic vibration is stably transmitted to the ultrasonic horn. The bag-making and filling packaging machine according to Claim 1.

3. When the control unit stops the conveyance, before conveying the tubular packaging material in the reverse conveyance direction, it conveys the tubular packaging material in the conveying direction. The bag-making and filling packaging machine according to Claim 1.

4. The distance that the tubular packaging material is conveyed in the reverse conveyance direction is equal to the distance that the tubular packaging material is conveyed in the conveying direction before being conveyed in the reverse direction. The bag-making and filling packaging machine according to Claim 3.

5. The material to be packaged is supplied at regular intervals. When the control unit stops the conveyance, it completes the conveyance in the reverse conveyance direction before the elapse of the regular time. The bag-making and filling packaging machine according to Claim 1.

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