JP5833873B2 - Roll crimping device for sealing in packaging machines - Google Patents

Description

  The present invention relates to a sealing roll crimping apparatus in a packaging machine, and more particularly, to a sealing roll crimping apparatus including a crimping roller that performs center sealing by crimping heated side edges of a web-shaped packaging material.

  Conventionally, a horizontal bag making filling packaging machine is known as one kind of packaging machine. The horizontal bag making filling and packaging machine sequentially delivers and supplies articles at predetermined intervals by a supply conveyor into a film that is a packaging material that is bent into a substantially cylindrical shape by a bag making machine and is transferred horizontally. A center seal device is used to apply a center seal to the overlapping portion of the edges in the longitudinal direction of the supplied bent film to form a cylindrical film, and end seal and cut by an end seal device before and after sandwiching the cylindrical film article, respectively. The so-called pillow package is manufactured.

  As a center seal device for a horizontal bag making filling and packaging machine, there is one configured as a bar heater in which a pair of substantially rectangular parallelepiped heater bars with a built-in heater are arranged so as to sandwich the longitudinal edge portions of the stacked films. . Between the two heater bars, a gap is maintained so that each heater bar and the overlapping portion of the film are in light contact with each other, so that the overlapping portion at the edge in the longitudinal direction of the film passing through the gap is softened by the heat from the heater bar. Then, the overlapped portion is pressed and center-sealed by sandwiching the softened overlapped portion with a pressure roller disposed in the next stage of the bar heater (Patent Document 1).

  The pressure roller is composed of a pair of metal rolls that can be opened and closed with respect to each other. The rollers are in contact with each other in the closed state and separated from each other in the open state. In the closed state, they are brought into close contact with an urging means such as a spring. This is because the overlapping portion of the edge portion in the longitudinal direction of the film heated by the preceding bar heater and softened is pinched and sealed. Further, the pressure roller does not have a film feeding function, and therefore is not rotated by a driving device but only rotated in accordance with the traveling of the film.

  Further, since the above-described pressure roller does not have a heating means, it is placed in a closed state except during maintenance of the packaging machine and setting of the film. This is the function of preventing empty bags even when the packaging machine is stopped or even when the packaging machine is in operation (the supply of articles to be packaged is temporarily missing and an empty bag package is produced. This is because the film will not be damaged by heat even when the pressure roller is sandwiching the overlapping part when the film transport is stopped when the function of is there.

  Since the pressure roller is often in a closed state as described above, the opening / closing mechanism is generally configured to be performed manually. Moreover, since the pressure for sealing changes with conditions, such as the thickness of a film, when selecting and using from several types of films, it is necessary to adjust a pressure before using. As shown in FIG. 5, in the conventional roller crimping device 60, when a packaging machine that can handle various films, the crimping rollers 61 and 62 are rotatably supported by roller supports 63 and 64, respectively. The supports 63 and 64 can slide on a fixed slide shaft 65. The slide shaft 65 is provided with stoppers 66a and 66b for restricting the roller supports 63 and 64 from moving away from each other. In order to press the pressure-bonding rollers 61 and 62 against the packaging material Ft in the pressure-bonding direction, springs 67 and 68 for urging the roller supports 63 and 64 are provided, and the screwing amounts of the pressure adjusting screws 69 and 70 are adjusted. By doing so, it is possible to adjust the strength of the spring force of the springs 67 and 68 by sliding the roller supports 63 and 63 on the slide shaft 65. In the pressure-adjustable roller crimping device 60 shown in FIG. 5, by operating the opening / closing lever 71 and rotating the opening / closing cam 72, the pressure-bonding rollers 61, 62 together with their supports 63, 64 are slide shafts. It moves to the direction which mutually spaces apart along 65, and has the structure which can widen the clearance gap between the pressurizing rollers 61 and 62. FIG. In FIG. 5, (a) shows the pressure-bonded state of the roller, and (b) shows the open state of the roller.

  When the product packaged by the horizontal bag making and filling machine is food such as cookies or confectionery, product waste may be generated during conveyance by the supply conveyor. When foreign matter such as the product residue is sandwiched between center seal portions where the packaging material is superposed, it is required that foreign matter detection be performed. Regarding the foreign matter detection at the center seal part, a method of detecting using a servo motor in another type of center seal device (rotor sealer with built-in heater) has been proposed. That is, this center seal device includes two rolls having a built-in heater and having a plurality of grooves for attaching a seal to the surface. This is a system in which a center seal is applied while conveying a film by sandwiching and heating the overlapping portion of the edge. Servo motor is used as a driving device to rotate the roll with seal, and reference data is created and stored for servo motor drive current during normal packaging operation. The foreign matter is detected at the center seal portion by monitoring the above and comparing it with the reference data (Patent Document 2). Further, Patent Document 2 suggests that the opening and closing of the roll is driven by a servo motor, and that the function of this servo motor can be used to control the seal pressure and monitor foreign matter. As a result, in the center seal device of the type in which the above-described heater is incorporated and the roll with a seal is rotationally driven, a certain result has been obtained with respect to the detection of foreign matter at the center seal portion.

  However, in the center seal device that employs the center seal method using the bar heater and the pressure roller, there is no drive device that rotates and conveys the film, and the method disclosed in Patent Document 2 cannot be employed. Therefore, in the case of a center seal type center seal device using a bar heater and a pressure roller, a method for monitoring the behavior of the pressure roller must be taken by adding a detection means such as a displacement sensor, which increases the complexity and cost of the configuration. Was inviting the rise. In addition, in the rotary sealer system with a built-in heater suggested in Patent Document 2, the seal pressure is controlled and the detection of foreign matter is detected by opening and closing the roll with a servo motor. Since there is a seal on the roll surface, it depends on the meshing accuracy between the seals. For this reason, the set seal pressure commanded to the servo motor and the pressure actually applied to the center seal portion by the roller do not coincide with each other, and there is a problem that it differs for each machine. In addition, foreign matter detection can detect a product having hardness or thickness for the same reason, but it cannot detect minute product residue.

  Further, the packaging failure in the center seal device is not limited to the one caused by the intrusion due to the intrusion of foreign matter, but also the sealing failure caused by the film conveyance state (meandering) and the behavior of the product in the cylindrical film. In the latter case, one or both of the superposed film edges may be detached from the roller that is temporarily pinched due to the occurrence of misalignment of the overlapping portions of the longitudinal edges of the film. Is mentioned. In this case, a minute difference in thickness for one film must be detected, which is difficult with the conventional method.

Japanese Utility Model Publication No. 5-18129 JP 2009-126533 A

Therefore, there is a problem to be solved in that the pressure for crimping the packaging material for the center seal can be adjusted and the packaging failure of the center seal of the packaging material can be detected.
An object of the present invention is to solve the above-mentioned problem, and is a center seal device of a bag making and filling packaging machine of a type provided with a pressure roller for pressure-bonding a heated overlapping portion of a packaging material, the pressure roller packaging The pressure adjustment for the material can be set from the operation unit, and can be set without any pressure adjustment work even when there is a product combined use (packaging material type and article replacement) and without variation for each machine, In addition, it is possible to reliably detect defects in the center seal due to the intrusion of minute product debris that has entered the center seal area of the packaging material and the misalignment of the overlapping parts of the film, without requiring a separate sensor or other detection means. It is providing the roll crimping | compression-bonding apparatus for sealing which can be performed.

In order to solve the above-described problems, a roll pressure crimping device for sealing in a packaging machine according to the present invention includes two pressure rollers disposed opposite to each other with a portion to be sealed on the packaging material, and a drive source for driving the pressure rollers to open and close Servo motor, a motion conversion mechanism that converts the rotation output of the servo motor into an opening / closing operation of the pressure roller, and a rotation of the servo motor to cause the pressure roller to perform the opening / closing operation in response to the transfer of the packaging material And the motion conversion mechanism outputs an output of a predetermined rotation range of the servo motor corresponding to a position between a closing position occupied by the pressure roller in the closing operation and a predetermined opening position where the pressure roller opens. , was converted to one side opening for opening and closing the pressure roller of only one, the control unit may close the said one of the pressure rollers to the side opening During operation, based on the variation of the fluctuation or torque of the rotation amount of the servo motor caused by the gap between the pressure rollers is enlarged or reduced, before Symbol biting of foreign substances between the pressure roller or packaging abnormal It is characterized by detecting.

According to the sealing roll crimping device in this packaging machine, the variation in the amount of rotation or the variation in torque in the servo motor is detected, and during the closing operation of the crimping roller sandwiching the portion to be sealed on the packaging material , Based on fluctuations in the amount of rotation or torque in the servo motor caused by the increase or decrease in the gap between the pressure rollers, abnormal fluctuations exceeding the setting standard for the gap between the pressure rollers are detected. Without using this sensor, it is possible to detect a foreign matter biting or an abnormality in the packaging material between the pressure rollers. In addition, the motion conversion mechanism can output an output within a predetermined rotation range of the servo motor corresponding to the position between the closing position occupied by the pressure roller in the closing operation and the predetermined opening position where the pressure roller opens, and can open and close only one pressure roller. Since it is converted to open / close, the open / close operation of the one pressure roller is transmitted to the open / close drive servomotor via the motion conversion mechanism, and the rotation output shaft of the servomotor has a large rotation amount (pulse change) or torque change. Give rise to During the closing operation of one of the pressure rollers that opens and closes on one side, the control unit detects a foreign matter bite or an abnormality in the packaging material between the pressure rollers based on the variation in the rotation amount or torque in the servo motor. As described above, according to the opening / closing operation performed only by the pressure roller on one side, the control unit can largely detect the fluctuation of the rotation amount or torque of the servo motor to be monitored. Even small changes caused by the abnormality of the packing material or the packaging material can be reliably detected with high detection accuracy.

The seal roll crimping device in the packaging machine, the transfer of the previous SL packaging is carried out by the paper drawing rollers for transporting across a portion to be subjected to the sealing, the control unit, opening and closing of the paper pull rollers The pressure roller can be opened and closed in conjunction. The paper drawing roller is opened when the packaging material is set in the packaging machine or the like, but remains closed otherwise.
Further, the motion converting mechanism supports the one pressure roller and supports a first roller support slidably attached to a fixed frame of the packaging machine, supports the other pressure roller, and the packaging machine. A second roller support attached to the fixed frame and a link mechanism for connecting the rotation output portion of the servo motor and the first roller support can be provided. The rotation output of the servo motor is transmitted to the first roller support through the link mechanism, and the first roller support slides with respect to the fixed frame, so that one pressure roller supported by the first roller support is the other It opens and closes against the pressure roller.
The pressure roller can have a smooth cylindrical peripheral surface for pressure bonding. By not providing irregularities such as seals on the surface of the pressure roller, it is possible to avoid a decrease in detection accuracy due to deformation of the packaging material.
Furthermore, in the roll press for sealing in this packaging machine, the cylindrical packaging material is formed by applying a center seal to the overlapping portion where the both side edges of the belt-shaped packaging material bent into a substantially cylindrical shape are overlapped, A horizontal bag making and filling machine or a vertical bag making filling in which the product to be packaged is filled inside the cylindrical packaging material, and the cylindrical packaging material is end-sealed before and after the product to perform pillow packaging. In the packaging machine, the pressure roller is applied so as to be two pressure rollers between which the overlapping portions are passed in order to press the heated overlapping portions to form the center seal. Can do.

The sealing roll crimping apparatus in the packaging machine according to the present invention is configured as described above. Therefore, by controlling the torque of the servo motor that drives the crimping roller to open and close, the clamping roller sandwiches the packaging material. It can be set from the operation section, and even when there is a combination of products, it is possible to change the clamping pressure without performing pressure adjustment work, and separately detect packaging defects due to small product debris and film center seal misalignment By using the device of the opening / closing mechanism and the function of the servo motor without adding means, it is possible to carry out with high foreign object detection accuracy. Further, since only one pressure roller opening of the pressure roller is the one-sided opening and closing of the opening and closing, the control unit can detect the variation of the fluctuation or torque of the rotation amount increases Oite servo motor In addition, a minute change due to the entry of minute foreign matter, scumming, or abnormality of the packaging material can be reliably detected with high detection accuracy .
The present invention also relates to a seal pressure bonding device for a center seal device having a bar heater and a pressure roller, which is a center seal method having no drive source for film conveyance, and relates to seal pressure adjustment and packaging defect detection. Can be performed with high accuracy. The pressure roller itself has no seal or has an advantage of good response when a foreign substance enters or the packaging material is abnormal because the roll diameter is reduced to reduce the inertial force.

It is a side view which shows an example of the horizontal type bag making filling packaging machine with which the roll crimping | compression-bonding apparatus for seals by this invention was applied. It is a top view of the horizontal type bag making filling packaging machine shown in FIG. It is detail drawing which shows the pressurization roller part of the horizontal type bag making filling packaging machine shown in FIG.1 and FIG.2. FIG. 4 is a diagram illustrating a state where the pressure roller is opened in the pressure roller portion illustrated in FIG. 3. It is a figure which shows the example of the conventional roller crimping | compression-bonding apparatus.

  Hereinafter, an embodiment of a sealing roll crimping apparatus in a packaging machine according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing an example of a horizontal bag making filling and packaging machine to which a sealing roll crimping apparatus according to the present invention is applied, and FIG. 2 is a plan view of the horizontal bag making filling packaging machine shown in FIG.

  A horizontal bag making and filling and packaging machine 1 shown in FIGS. 1 and 2 includes a film supply source 2 that is rotatably loaded and supported by a film roll Fr around which a web-like packaging film Fw is wound, on the upstream side of the packaging film. And a paper feed roller 3 that feeds the web-shaped packaging film Fw from the film roll Fr of the film supply source 2. The paper feed roller 3 includes a driving roller 3 a and a driven roller 3 b that sandwich and feed the web-like packaging film Fw. The driving roller 3 a of the paper feed roller 3 is like a belt transmission device 4 a by a servo motor 4. It is driven via an appropriate transmission mechanism. The web-like wrapping film Fw fed out from the paper feed roller 3 is bent by the cylinder making machine (former) 5 until the side edge portions are drawn toward each other and become substantially cylindrical.

  The web-shaped packaging film Fw that is bent into a substantially cylindrical shape when passing through the cylinder making device 5 passes through the center sealing device 6 after passing through the cylinder making device 5, and in that case, both sides as overlapping portions. A center seal is applied to the edge portion to form the cylindrical packaging film Ft. The cylindrical packaging film Ft that has been center-sealed by the center-sealing device 6 is subjected to end-sealing between products by an end sealer 7 that is disposed downstream of the center-sealing device 6, thereby providing a pillow packaging body. Bp is produced continuously. The end sealer 7 can incorporate a cutter 7a that cuts the packaging film and individually separates the pillow package Bp in the end-sealed region. In the horizontal bag making and filling machine 1, in order to send the product P into the web-shaped packaging film Fw bent by the cylinder making machine 5, the feeding conveyor 8 is combined.

  In the illustrated example, the center seal device 6 includes a paper drawing roller unit 10, a heating bar heater unit 20, a pressure roller unit 30, and a weight roller unit 40 from the upstream side of the packaging film. The paper drawing roller unit 10 includes a pair of rollers 11 and 12 that sandwich both side edge portions Fe and Fe of a web-shaped packaging film Fw that is bent in a substantially cylindrical shape, between the peripheral surfaces. The rollers 11 and 12 receive the driving force supplied from the paper-drawing servomotor 13 and are rotated at a speed synchronized with each other in the opposite direction. Accordingly, the web-like packaging film Fw is heated for heating, in which both side edge portions Fe and Fe are sandwiched between the peripheral surfaces of the rollers 11 and 12 and immediately after the downstream side of the paper drawing roller portion 10. It is sent to the bar heater unit 20.

  The heating bar heater section 20 has a pair of elongated rectangular parallelepiped heater bars 21 along the direction in which the side edge portions Fe and Fe are fed so that the side edge portions Fe and Fe of the web-shaped packaging film Fw pass between them. 22 is provided. The bar heater unit 20 also includes an opening / closing servo motor 23 for bringing the pair of heater bars 21 and 22 close to each other or separating them. Heating means (not shown) is embedded in the heater bars 21 and 22, and radiant heat is emitted from the opposed surfaces of the heated heater blocks 21 and 22, and the web passes through the gap between the heater blocks 21 and 22. The side edges Fe and Fe of the wrapping packaging film Fw are heated. When the opening / closing servo motor 23 is driven, the bar heater unit 20 is opened / closed, whereby the gap amount between the heater blocks 21, 22 can be easily adjusted according to, for example, the type, material, thickness, etc. of the packaging film. it can.

  Immediately after the downstream side of the bar heater section 20, a pressure roller section 30 as a sealing roller pressure bonding apparatus according to the present invention is disposed. The pressure roller section 30 includes pressure rollers 31 and 32 arranged with their peripheral surfaces facing each other so as to sandwich both side edges Fe and Fe of the web-shaped packaging film Fw heated by the bar heater section 20. In the pressure roller section 30, the pressure rollers 31 and 32 sandwich and press the side edges Fe and Fe of the web-shaped packaging film Fw heated by the bar heater section 20. The bent packaging film Fw is heat-sealed by pressure bonding to both side edge portions Fe and Fe, and this sealed portion serves as a center seal and is formed into the cylindrical packaging film Ft. Since the pressure roller section 30 is not provided with a driving means, the pressure rollers 31, 32 are not rotationally driven by power, but are pressed against both side edges Fe, Fe of the web-like packaging film Fw. It simply rotates following the feed of the packaging film. The peripheral surfaces of the pressure rollers 31 and 32 have a smooth shape with no basis weight. The pressure roller 30 is provided with an opening / closing servo motor 33 for moving the pressure rollers 31, 32 closer to or away from each other, and the opening / closing operation of the pressure rollers 31, 32 is controlled by driving of the opening / closing servo motor 33. In addition, it is used to apply pressure contact force between the side edge portions Fe and Fe by the pressure rollers 31 and 32.

  A weight roller unit 40 is disposed immediately after the downstream side of the pressure roller unit 30. The weighting roller unit 40 is a pair of weighting rollers 41 and 42 for sandwiching the side edge portions Fe and Fe, to which the heat sealing of the cylindrical packaging film Ft is applied, between the peripheral surfaces, and a drive for driving the weighting rollers 41 and 42. Servo motor 43. The weighting rollers 41 and 42 are supplied with driving force from the driving servomotor 43, are rotated at a speed synchronized with each other in the opposite direction, and convey the packaging film. The rotation speeds of the fabric weight rollers 41 and 42 are basically synchronized with the output of the paper drawing servo motor 13 of the paper drawing roller unit 10, but the ratio can be changed. Circumferential grooves such as sealing eyes are formed on the peripheral surfaces of the weighting rollers 41 and 42, and mesh with each other with both side edge portions Fe and Fe having heat sealing therebetween. If it is a general film, it will be sealed just by pinching because it is just after sealing, but it is possible to heat with a built-in heater in the case of a film that is difficult to see such as a thick packaging film It is. An end sealer 7 is disposed on the downstream side of the weight roller 40.

  The packaging machine controls each part in accordance with the packaging operation from the feeding of the packaging film and the article P to the packaging of the article P by the packaging film, so that the servo motor 4 of the paper feed roll 3 and the motor for driving the feeding conveyor 8 ( (Not shown), a paper drawing servo motor 13 of the paper drawing roller section 10, an opening / closing servo motor 23 for opening and closing the heater bars 21 and 22 according to the transfer of the packaging material, and an opening / closing servo of the pressure roller section 30 A motor 33, a servo motor 43 for driving the weight roller unit 40, and a control unit 9 for controlling the operation of the end sealer 7 are provided. In the bar heater unit 20, the control unit 9 controls the operation of the opening / closing servomotor 23 to convert the rotation output of the opening / closing servomotor 23 into the opening / closing operation of the heater bars 21, 22. When close to the overlapping portion, heat for sealing is applied from the heater bars 21 and 22 to the overlapping portion. The heater bars 21 and 22 are adjusted according to the type, material, thickness, and the like of the packaging material by the rotation output of the servo motor 23 for opening / closing, that is, the degree of proximity to the overlapping portion of the packaging material sandwiched therebetween. .

  In addition, in the bar heater section 20, the heater bars 21 and 22 are arranged so as to sandwich the overlapping portion of the film to be conveyed. An opening / closing servomotor 23 is provided as an actuator for opening and closing the heater bars 21 and 22 in order to bring the heater bars 21 and 22 closer to and away from each other. The servo motor 23 for opening and closing moves the heater bars 21 and 22 close to each other while keeping a certain gap during film conveyance, and allows the overlapping portions of the films to pass through the gap. When the film transport is stopped, the opening / closing servomotor 23 separates the heater bars 21 and 22 so that the overlapping portions of the film are not overheated by the heat from the heater bars 21 and 22.

  Detection of foreign matter biting into the center seal device 6, particularly the pressure roller portion 30, can be performed by the opening / closing servo motor 33. That is, when a foreign object enters between the press rollers 31 and 32, the space between the press rollers 31 and 32 is widened by the foreign object. The movement of the pressure roller 31 (32) at this time can be detected as a deviation amount (pulse associated with the rotation of the output rotation shaft) or torque change in the opening / closing servomotor 33. Thereby, even if a separate displacement sensor is not prepared, it is possible to detect foreign object biting into the center seal device 6, particularly the pressure roller unit 30, by the behavior indicated by the opening / closing servomotor 33. In addition, when the pressure roller 31, 32 is open, a foreign object having a size larger than the opening gap can be detected in the same manner. Further, even in the case of a film abnormality in which the packaging film deviates from between the pressure rollers 31 and 32, it can be detected by detecting the decrease in the gap between the pressure rollers 31 and 32 by the open / close servo motor 33.

  As described above, in the pressure roller section 30, the pressure rollers 31 and 32 are opened and closed by the operation of the opening / closing servo motor 33. FIG. 3 is a detailed view showing the pressure roller section of the horizontal bag making filling and packaging machine shown in FIGS. 1 and 2, wherein (a) is a plan view of the pressure roller section, (b) is a front view thereof, and ( c) is a side view thereof. 4 is a view showing a state where the pressure roller is opened in the front view of the pressure roller portion shown in FIG. However, in FIG. 3, the flow direction of the packaging film is shown opposite to the direction shown in FIGS. 1 and 2, but can be appropriately selected according to the layout of each part around the pressure roller part 30. is there.

  As shown in FIG. 3, the right pressure roller 32 is arranged such that the rotational axis position of the right pressure roller 32 is fixed with respect to the fixed frame 50 as the second roller support, and the left pressure roller 31 is fixed to the fixed frame 50. Are slidable. The opening / closing servomotor 33 is attached to an attachment plate 52 fixed to the fixed frame 50. At least two parallel slide shafts 53, 53 are attached to the fixed frame 50, and a slide member 54 as a first roller support is slidably provided on the slide shafts 53, 53. . The axial direction of the slide shafts 53 and 53 is a direction connecting both the rotational axes of the pressure-bonding rollers 31 and 32 in the plan view (a), and is a direction orthogonal to the rotational axes. Further, the left pressing roller 31 is rotatably supported by a slide member 54 on the rotating shaft. A stopper 55 that restricts the maximum slide position of the slide member 54 is provided at the end of one slide shaft 53.

  The rotation output shaft 56 of the opening / closing servomotor 33 is connected to the slide member 54 via a link 57 which is a motion conversion mechanism 51. The link 57 includes a link arm 58a fixed to the rotation output shaft 56, and a link arm 58b rotatably connected to the link arm 58a by a pivot 59a. The link arm 58b is a slide member 54 by a pivot 59b. It is connected to the pivotable. By rotating the opening / closing servo motor 33, the slide member 54 slides on the slide shafts 53, 53 via the link 57, so the left pressure roller 31 provided on the slide member 54 is in the flow direction of the packaging film. It moves forward and backward at right angles to and opens and closes. As a result, opening and closing of the pressure-bonding rollers 31 and 32 are automated, and by controlling the torque of the opening and closing servomotor 33, both side edges of the packaging film when the pressure-bonding rollers 31 and 32 are closed in the center seal device 6 It is possible to easily adjust the pressure for sandwiching Fe and Fe.

  The conditions for opening and closing the pressure rollers 31 and 32 are linked to the opening and closing of the rollers 11 and 12 of the paper drawing roller unit 10. That is, when the rollers 11 and 12 of the paper drawing roller unit 10 are opened, the open / close servo motor 33 is rotated in conjunction with the operation to move the left pressure roller 31 to the open position. When the rollers 11 and 12 of the paper drawing roller unit 10 are closed, the open / close servo motor 33 is rotated in reverse in conjunction with the operation, and the left pressure roller 31 is moved to the closed position. When the left pressure roller 31 moves to the closed position, the torque set for the opening / closing servomotor 33 is maintained. When the packaging film is in the conveying state, the state of the opening / closing servomotor 33 is constantly monitored. The pressure-bonding rollers 31 and 32, like the paper-drawing rollers 11 and 12, do not have a built-in heater, and can be kept closed except during the film setting operation.

  According to the present invention, the detection of the intrusion of foreign matter into the center seal device 6 (foreign matter contamination between the press rollers 31, 32) is detected by an open / close servo motor 33 that opens and closes the left press roller 31 of the press roller portion 30. Is done. That is, when the foreign matter enters the center seal device 6 and enters between the pressure rollers 31 and 32, the space between the pressure rollers 31 and 32 is pushed and spread by the foreign matter that has entered. At this time, since the right pressure roller 32 is supported by the fixed frame 50, the left pressure roller 31 opens, and this operation is transmitted to the opening / closing servo motor 33 via the link 57 which is the motion converting mechanism 51. The rotation output shaft 56 of the open / close servo motor 33 undergoes a rotation amount (pulse change) or torque change. The rotation amount and torque of the rotation output shaft 56 of the opening / closing servo motor 33 are monitored, and the change is judged based on the setting criteria, so that foreign matter enters the center seal device 6, that is, between the pressure rollers 31 and 32. It is possible to detect foreign material intruding without preparing a separate displacement sensor.

In the present invention, the following technical items are employed as a device that can reliably detect foreign matter penetration. That is,
(1) Since one roller (the right pressure roller 32) is fixed and only one roller (the right pressure roller 31) is opened / closed, in the servo motor 33 for opening / closing, the rotation output shaft 56 of the rotary output shaft 56 when a foreign object enters Large amount of change (rotational deviation). Therefore, the detection accuracy is high, and it is possible to detect minute changes caused by defective packaging, such as a small product debris and the detachment of the packaging film from the pressure rollers 31, 32.
(2) Since the diameter of the pressure roller 31 is kept to a minimum, the inertia force is small, and a minute change caused by a packaging defect such as a small product debris or a film being detached from the pressure roll. Since the response (movement in the direction of the slide shaft 53) is fast, the detection accuracy is high.
(3) The pressure-bonding rollers 31 and 32 are not provided with a seal (a seal roller is provided with a weight roller 43 at a later stage), and has a flat contact surface made of metal. Since the pressure-bonding rollers 31 and 32 are in contact with the packaging film, there is no elastic deformation when the packaging film is pinched, and it does not depend on the meshing accuracy between the sealing eyes as in the case where there are sealing eyes. Also, it is possible to detect a minute product force or a deviation of a thin packaging film with high detection accuracy. Although the detection accuracy is somewhat lowered, one side of the pressure-bonding roll can be a rubber roller.

DESCRIPTION OF SYMBOLS 1 Horizontal type bag making filling packaging machine 2 Film supply source 3 Paper feed roll 3a Drive side roller 3b Driven side roller 4 Servo motor 4a Belt drive device 5 Cylinder 6 Center seal device 7 End sealer 7a Cutter 8 Feeding conveyor 9 Control part DESCRIPTION OF SYMBOLS 10 Paper drawing roller part 11, 12 Roller 13 Paper drawing servo motor 20 Bar heater part 21, 22 Heater bar 23 Opening / closing servo motor 30 Pressing roller part 31, 32 Pressing roller 33 Opening / closing servo motor 40 Covering roller part 41, 42 Weighting roller 43 Servo motor for driving 50 Fixed frame 51 Motion conversion mechanism 52 Mounting plate 53, 53 Slide shaft 54 Slide member 55 Stopper 56 Rotation output shaft 57 Link 58a, 58b Link arm 59a, 59b Axis Fr Film roll Fw Web-like packaging film F t Cylindrical packaging film Fe, Fe Both side edges P Product Bp Pillow packaging

Claims (5)

Two pressure rollers placed opposite to each other with a portion to be sealed on the packaging material, a servo motor as a drive source for opening and closing the pressure roller, and a rotation output of the servo motor is converted into an opening / closing operation of the pressure roller A movement conversion mechanism, and a controller for controlling the rotation of the servo motor in order to cause the pressure-bonding roller to perform the opening / closing operation according to the transfer of the packaging material,
The motion converting mechanism outputs an output of a predetermined rotation range of the servo motor corresponding to a gap between a closing position occupied by the pressure roller in the closing operation and a predetermined opening position where the pressure roller opens. Convert to one side opening and closing,
The control unit is based on fluctuations in the amount of rotation or torque in the servo motor that occurs when the gap between the pressure rollers expands or decreases during the closing operation of the one pressure roller that opens and closes on one side. , before Symbol crimping rollers between sealing roll crimping device in the packaging machine and detecting an abnormality of biting or packaging of a foreign matter in. The packaging material is transported by a paper pulling roller that transports the portion to be sealed, and the control unit opens and closes the pressure roller in conjunction with opening and closing of the paper pulling roller. The roll crimping apparatus for sealing in the packaging machine according to claim 1 . The motion conversion mechanism includes a first roller support that supports the one pressure roller and is slidably attached to the fixed frame of the packaging machine, and supports the other pressure roller and the fixed frame of the packaging machine. The packaging according to claim 2 , further comprising: a second roller support attached to the servomotor; and a link mechanism connecting the rotation output portion of the servo motor and the first roller support. Roll crimping device for sealing in the machine. The said pressure roller is provided with the cylindrical peripheral surface for smooth pressure bonding, The roll pressure bonding apparatus for seals in the packaging machine as described in any one of Claims 1-3 characterized by the above-mentioned. A cylindrical packaging material is formed by applying a center seal to the overlapping portion where the side edges of the belt-shaped packaging material bent in a substantially cylindrical shape are overlapped, and the product to be packaged inside the cylindrical packaging material In a horizontal bag making and filling machine or a vertical bag making and filling machine that performs pillow wrapping by applying an end seal to the cylindrical wrapping material before and after the product, the pressure roller is heated. to crimp heavy combined portions to form the center seal, said one of the claims 1-4, characterized in that it is applied to heavy combined element is referred to as two pressure rollers which are passed between A roll pressing device for sealing in the packaging machine according to claim 1.

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