JP5222811B2 - Sealing device for bag making and filling machine - Google Patents

Description

  The present invention relates to a sealing device for a bag making and filling machine in which a cylindrical film supplied with an article is subjected to a predetermined seal to obtain a packaging bag.

  A belt-like film drawn out from the raw fabric roll is formed into a cylindrical shape by bag making means, and a vertical seal is applied to the cylindrical film and an article is supplied into the cylindrical film, and then a horizontal seal is provided by a sealing device. Is given. As such a sealing apparatus, what was described in patent document 1 is known, for example. The sealing device of Patent Document 1 is arranged so that each eccentric gear is eccentric by a predetermined amount with respect to each drive gear that receives power from a drive source and rotates, and each seal body is eccentric with respect to each eccentric gear. And making each eccentric gear mesh with a fixed gear having twice the number of teeth of the eccentric gear, thereby reducing the change in the pressing force (seal force) of the upper and lower seal bodies during the sealing period, Vibrations and impact sounds that occur when the upper and lower seal bodies abut each other are suppressed.

Japanese Patent No. 4190714

  However, since the conventional sealing device has a constant gear ratio between the eccentric gear and the fixed gear and the eccentric amount of the eccentric gear, for example, the shape and size of the packaged article, the material of the film, etc. When the type of the seal changes, it cannot be sealed with an appropriate sealing pressure corresponding to the change.

  It is an object of the present invention to provide a sealing device that can freely set the proximity of a pair of sealing bodies in a bag making and filling machine.

The invention of claim 1, to facilities the transverse seal by moving together with the conveying of the conveying path 44 by sandwiching the tubular film 6 by a pair of sealing members 40 and 43 facing each other across the tubular film 6 of the tubular film 6 a sealing device 8 of bag making filling machine, the first gear 20, a second gear 22 meshing with the first gear 20, the conjunction rotates concentrically with the axis of the first gear 20 second a rotating member 19 which supports the gears 22 rotatably, and the second the first gear 20 across the gear 22 is connected to the rotary member 19 which extends in the opposite, the rotating member 19 a linkage mechanism for rotating concentrically to the axis of the first gear 20, and one of the seal member 43 in the second pair of sealing members 40 and 43 rotatably supported at an eccentric position of the gear 22 and the other seal member 40 and the seal means and opening and closing supporting the opposite A first control motor 17 which drives the first gear 20, and a second control motor 24 which drives the linkage mechanism, rotates the second control motor 2 4 Thus the pivot member 19, the The first control motor 17 is configured to be able to adjust the distance between the seal bodies 40 and 43 when the both seal bodies 40 and 43 move along with the conveyance of the tubular film 6 .

  In the second aspect of the invention based on the first aspect of the invention, the linkage mechanism includes a third gear 26 that is rotated by a second control motor 24, an eccentric position of the third gear 26, and the rotating member 19. It is comprised by the interlocking member 30 each connected so that rotation was possible.

  In the invention of claim 3 based on the invention of claim 1 or claim 2, the rotating member 19 and the linkage mechanism are connected by a shaft 29, and a fourth gear 33 is disposed on the shaft 29. The shaft 29 rotates together with the fourth gear 33 by driving the first control motor 17 or the second control motor 24.

  In the invention according to claim 4, which is based on any one of claims 1 to 3, a detection means for detecting the biting of the article 7 by the pair of seal bodies 40, 43 is provided, and the detection by the detection means Thus, the second control motor 24 is driven to rotate the rotating member 19 so that the seal bodies 40 and 43 are separated from each other.

  The invention of claim 5 based on any one of claims 1 to 4 is a sealing device 8 of a horizontal bag making and filling machine, which is moved in a vertical direction with respect to the fixed frame and the fixed frame. And a height adjusting mechanism capable of adjusting the position of the moving frame in the height direction with respect to the fixed frame. The moving frame includes a first gear 20, a linkage mechanism, and a first mechanism. Since the control motor 17 and the second control motor 24 are supported, the height positions of the pair of seal bodies 40 and 43 can be changed.

According to the first aspect of the present invention, when the second control motor is driven to rotate the rotating member, the second gears supporting the sealing means can be moved closer to or away from each other. a pair of seal members with the rotation is Ru can be freely set the distance between the seal body as it moves together with the conveying of the tubular film.
For example, in a state in which the pair of sealing members are sandwiched between the tubular film, Ru can be moved linearly along the two sealing bodies in the transport direction of the tubular film.
Further, for example, by adjusting the distance between the seal body at the moment in which a pair of sealing members are sandwiched between the tubular film, and to suppress vibrations and impact noise, the distance between both seal body in accordance with the type of film By adjusting, the length of the linear movement trajectory and the seal pressure related to the seal time can be arbitrarily changed.

  According to the invention of claim 2, by configuring the linkage mechanism by the third gear and the interlocking member, both of the rotation member with the rotation of the rotation member can be obtained from the relationship between the number of teeth of the first gear and the number of teeth of the third gear. Timing calculation for approaching or separating the seal body is facilitated.

  In the invention of claim 3, when the rotating member is rotated, the shaft that rotatably supports the rotating member and the linkage mechanism is rotated together with the fourth gear, so that the sealing means or It is possible to prevent a part of the shaft from being worn or deformed due to load concentration by the second gear or the rotating member, and to prevent rattling between the rotating member and the cooperation mechanism.

  In the invention of claim 4, when the detection means detects the biting of the article, the damage to the article or the sealing means can be reduced by rotating the rotating member to separate the pair of seal bodies. it can.

  In the invention of claim 5, the height adjustment mechanism is provided in the sealing device of the horizontal bag making and filling machine, so that the height of the pair of sealing bodies sandwiching the cylindrical film in response to various changes in the article height. The position can be changed.

1 is a schematic diagram showing a sealing device according to a first embodiment. The schematic diagram which removed the seal body from the seal device of a 1st embodiment, and was seen from the upper part. FIG. 2 is a schematic view taken along line AA in FIG. 1. The schematic diagram in the BB line of FIG. The schematic diagram which shows the whole structure of a bag making filling machine. The schematic diagram which shows the sealing device of 2nd Embodiment. FIG. 7 is a schematic diagram taken along line CC in FIG. 6.

The sealing device of the bag making and filling machine according to the first embodiment will be described with reference to FIGS.
As schematically shown in FIG. 5, in a horizontal bag making and filling machine exemplified as a film packaging machine, a belt-like film 4 drawn out from an original fabric roll 3 by driving a driving roller 2 in a film feeding mechanism 1 is manufactured. The bag means 5 is formed into a cylindrical shape, and the cylindrical film 6 is vertically sealed, and articles 7 are supplied into the cylindrical film 6 at predetermined intervals. The cylindrical film 6 is cut while the horizontal film 6 is laterally sealed, whereby a pillow package product is obtained. In the sealing device 8, the upper seal body 40 and the lower seal body 43 are opposed to each other with a conveyance conveyor 44 (conveyance path) conveying the cylindrical film 6 supplied with the article 7 as shown in FIG. Has been placed.

Hereinafter, the sealing device 8 shown in FIGS.
A fixed frame having fixed side frame portions 9 disposed on both sides in the left-right direction orthogonal to the film transport direction (front-rear direction) is formed in a substantially cubic shape having an opening inside. A pair of front and rear guide grooves 9 a are provided inside the left and right fixed side frame portions 9 so as to face in the vertical (height) direction. A movable side plate 10 which is one part of the moving frame is inserted between the pair of front and rear guide grooves 9a so as to be slidable in the vertical direction. When the operation handle 14 supported by the fixed frame is rotated, the moving frame is moved in the vertical direction with respect to the fixed frame by the female male screw mechanism by the male screw member 11 and the female screw member 12 being screwed together. Thus, a height adjustment mechanism is configured.

  A servo motor 17 as a first control motor is disposed near the lower side of the front side of the left movable side plate 10. A pair of upper and lower first drive shafts 18 are rotatably supported between the left and right movable side plates 10 above the servo motor 17. On the upper and lower first drive shafts 18, a rotation lever 19 (rotation member) is rotatably supported inside the left and right movable side plates 10, and a first gear 20 is integrated inside the left and right rotation levers 19. It is pivotally attached. The upper and lower first gears 20 mesh with each other. The rotating lever 19 rotates concentrically with the axis of the first gear 20 and extends rearward from the base end supported by the first drive shaft 18. A second drive shaft 21 is rotatably supported by the upper and lower rotating levers 19 at an intermediate portion spaced from the axis of the first gear 20. A second gear 22 is rotatably supported on the second drive shaft 21 from the left and right rotation levers 19. The upper second gear 22 meshes with the upper first gear 20, the lower second gear 22 meshes with the lower first gear 20, and the lower first gear 20 is the first control motor. 17 through the drive gear 23, the upper first gear 20 rotates in the opposite direction with respect to the lower first gear 20, and the upper second gear 22 and the lower second gear 22 are Rotate in opposite directions. In this way, the drive input mechanism is configured.

  A servo motor 24 as a second control motor is disposed on the lower side of the rear side of the left movable side plate 10. The servo motor 17 and the servo motor 24 are driven to rotate in response to a signal from a control unit (not shown), and the servo motor 24 can rotate in synchronization with the servo motor 17. A third gear 26 is pivotally supported on the left and right movable side plates 10. The upper and lower third gears 26 mesh with each other. A third drive shaft 27 is rotatably supported between the left and right movable side plates 10 above the servo motor 24. A drive gear 28 is attached to the third drive shaft 27 so as to be integrally rotatable inside the left and right turning levers 19. The drive gear 28 meshes with the lower third gear 26. An interlocking shaft 29 is rotatably supported at the tip of the upper and lower rotary levers 19 on the opposite side of the first gear 20 with the second gear 22 interposed therebetween. An interlocking lever 30 (interlocking member) is rotatably supported with respect to the interlocking shaft 29 inside the left and right rotating levers 19. The upper interlocking lever 30 extends downward from the interlocking shaft 29, and the lower interlocking lever 30 extends upward from the interlocking shaft 29. The upper interlocking lever 30 is rotatably supported with respect to the eccentric shaft 31 supported at the eccentric position of the upper third gear 26, and with respect to the eccentric shaft 31 supported at the eccentric position of the lower third gear 26. The lower interlocking lever 30 is rotatably supported. When the lower third gear 26 is rotated by the servo motor 24 via the drive gear 32, the upper third gear 26 rotates in the opposite direction with respect to the lower third gear 26. Due to the rotation of the upper and lower third gears 26, the upper and lower interlocking levers 30 that are eccentrically supported by the third gears 26 are moved closer to or away from each other in the vertical direction while the upper and lower rotary levers 19 are 1 Rotate about a drive shaft 18 and move close to or away from each other in the vertical direction. In addition, a linkage mechanism is comprised by arrange | positioning the interlocking lever 30 eccentrically to the 3rd gearwheel 26, respectively, so that rotation is possible.

  As shown in FIG. 4, the lower frame 37 is rotatably supported at an eccentric position of the second gear 22 supported by the lower rotation lever 19. Rods 38 are provided upright on both the left and right sides of the lower frame 37. An upper seal body 40 is attached to an upper frame 39 provided above the left and right rods 38. A slide block 41 is inserted into the left and right rods 38 so as to be movable up and down along the rods 38 between the upper and lower frames 37 and 39. A lower seal body 43 is attached to the left and right slide blocks 41. The left and right slide blocks 41 are rotatably supported at the eccentric position of the second gear 22 supported by the upper rotation lever 19.

  Since the eccentric position of the upper second gear 22 and the eccentric position of the lower second gear 22 are deviated from each other by 180 degrees, when the second gear 22 rotates in the opposite direction by the drive of the servo motor 17, The upper and lower seal bodies 40 and 43 are moved closer to and away from each other so that they move closer to each other while moving toward the downstream side in the film transport direction, and then move toward the upstream side in the film transport direction while moving away from each other. Seal means). A knife (not shown) is incorporated in the upper seal body 40, and a groove (not shown) for receiving the knife is formed in the lower seal body 43, so that the upper and lower seal bodies 40, 43 are connected to each other. After sealing the tubular film 6 in proximity, the tubular film 6 is cut with a knife.

  Further, by driving the servo motor 24, the upper and lower rotary levers 19 can be moved closer to or away from each other in the vertical direction, so that the axis of the second gear 22 supported by the upper and lower rotary levers 19 By changing the directional position, the distance between the axes can be changed. Therefore, the upper and lower sealing bodies 40 and 43 can be brought close to or separated from each other. In this manner, as shown by phantom lines V, X, and W in FIG. 5, when the upper and lower seal bodies 40 and 43 sandwich the tubular film 6 by driving the servomotor 17, the servomotor 17 is driven. By driving the servo motor 24 in synchronization, the upper and lower seal bodies 40 and 43 can be moved linearly (location of the imaginary line X) along the transport direction while maintaining a certain distance from each other.

  That is, the seal bodies 40 and 43 only move circularly by the drive of the servo motor 17, but by synchronizing the drive of the servo motor 24 with the drive of the servo motor 17, the seal bodies 40 and 43 are relatively moved in the vertical direction. By making the distance close to or away from each other, a linear movement locus such as the virtual line X in FIG. 5 can be freely set.

  In addition, for example, if the relative distance in the vertical direction between the seal bodies 40 and 43 at the moment when the pair of seal bodies 40 and 43 sandwich the tubular film 6 is adjusted, vibration and impact noise can be suppressed. Furthermore, by adjusting the relative distance in the vertical direction between the seal bodies 40 and 43, the seal pressure and the seal time can be adjusted according to the type of film.

  The upper and lower seal bodies 40, 43 are provided with detection means such as a proximity switch that inverts a signal when both the seal bodies 40, 43 approach each other at a predetermined distance. When an error is detected, the control means (not shown) releases the synchronization between the servo motor 17 and the servo motor 24 and rotates the upper and lower rotary levers 19 by driving the servo motor 24 to thereby move the upper and lower seal bodies. 40 and 43 are separated from each other.

  A fourth gear 33 is supported on the interlocking shaft 29 in the vicinity of the left interlocking lever 30 so as to be integrally rotatable. A fifth gear 34 is supported on the interlocking lever 30 so as to be rotatable integrally with the eccentric shaft 31, and a sixth gear 35 is supported in a state of meshing with the fourth gear 33 and the fifth gear 34. When the interlocking lever 30 swings by the drive of the servo motor 24, the fifth gear 34 and the sixth gear 35 rotate and the fourth gear 33 rotates with the interlocking shaft 29. The number of teeth of the fourth gear 33, the fifth gear 34, and the sixth gear 35 is set so that the rotation phase of the interlocking shaft 29 deviates from the drive gear 32 when the drive gear 32 rotates once by the servo motor 24. .

  The rotating lever 19, the drive input mechanism, the linkage mechanism, the servo motor 17 and the servo motor 24 described above are supported by the moving frame, so that the moving frame can be operated by turning the operation handle 14 of the height adjusting mechanism. And move in the height direction.

Next, a sealing device for a bag making and filling machine according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 7 with a focus on differences from the first embodiment.
In the first embodiment, the lower rotating lever 19, the first gear 20, the second gear 22, the third gear 26, the interlocking lever 30, and the like are omitted, and the following interlocking link mechanism 45 is adopted instead. Yes. The upper first gear 20 is rotated by the servo motor 17, and the upper third gear 26 is rotated by the servo motor 24.

  The interlocking link mechanism 45 is configured as follows. A slider 47 is supported by the guide rails 46 attached to the left and right movable side plates 10 so as to be movable in the film transport direction. A shaft 48 is installed between the left and right sliders 47, a shaft 49 is installed between the lower ends of the left and right rods 38 below the shaft 48, and a shaft 50 is installed between the slide blocks 41 above the shaft 48. Has been. An intermediate lever 51 is rotatably supported on the shaft 48. A lower lever 52 is rotatably connected to one end of the shaft 49 and the intermediate lever 51. An upper lever 53 is rotatably connected to the other end of the shaft 50 and the intermediate lever 51. When the second gear 22 is rotated by driving the servo motor 17, the slide block 41 moves upward or downward along the left and right rods 38, and the upper frame 39 is opposite to the slide block 41 by the rotation of the interlocking link mechanism 45. Move up and down in the direction of. Further, during this vertical movement, the slider 47 and the slide block 41 are moved along the guide rail 46 in the film transport direction by the interlocking link mechanism 45, so that the upper and lower seal bodies 40, 43 are located downstream in the film transport direction. After moving close to each other and moving to the upstream side in the film transport direction while moving away from each other, they are moved close to and away from each other in the vertical direction (sealing means).

  Further, by driving the servo motor 24, the rotation lever 19 and the slide block 41 are moved in the vertical direction, and the interlocking link mechanism 45 is further rotated to move the upper frame 39 in the direction opposite to the slide block 41. By being able to move, the upper and lower seal bodies 40 and 43 can be moved closer to or away from each other.

  Then, as indicated by phantom lines V, X, and W in FIG. 5, when the upper and lower seal bodies 40 and 43 sandwich the cylindrical film 6 by driving the servomotor 17, the servomotor 17 is synchronized with the driving. By driving the servo motor 24, the upper and lower seal bodies 40, 43 can be moved linearly (location of the imaginary line X) along the transport direction while maintaining a certain distance from each other. That is, the seal bodies 40 and 43 only move circularly by the drive of the servo motor 17, but by synchronizing the drive of the servo motor 24 with the drive of the servo motor 17, the seal bodies 40 and 43 are relatively moved in the vertical direction. By making the distance close to or away from each other, a linear movement locus such as the virtual line X in FIG. 5 can be freely set.

The first and second embodiments have the following effects in addition to the above.
* The linkage mechanism that rotates the rotation lever 19 concentrically with the axis of the first gear 20 is a third gear 26 that can be rotated by the drive of the servo motor 24, and the eccentric position and rotation of the third gear 26. Each of the levers 19 includes an interlocking lever 30 that is rotatably connected to the lever 19. For this reason, from the relationship between the number of teeth of the first gear 20 and the number of teeth of the third gear 26, it is easy to calculate the timing at which the seal bodies 40, 43 are moved closer to or away from each other as the rotating lever 19 rotates.

  * The interlocking shaft 29 can be rotated together with the fourth gear 33 along with the rotation of the rotating lever 19, and the rotation phase of the interlocking shaft 29 is driven when the drive gear 32 is rotated once by the servo motor 24 along with the rotation. The gear 32 is configured to be displaced. Accordingly, the sliding contact surface of the interlocking shaft 29 with respect to the rotating lever 19 and the interlocking lever 30 is changed, and a part of the interlocking shaft 29 is concentrated due to the load concentration by the sealing means, the second gear 22 and the rotating lever 19 when used for a long time. It is possible to prevent wear, deformation, etc. from occurring on the lens, and to prevent rattling between the rotating lever 19 and the interlocking lever 30 of the interlocking mechanism.

  * When the detection means detects the biting of the article 7, the synchronization between the servo motor 17 and the servo motor 24 is released, and the rotation lever 19 is rotated by driving the servo motor 24, thereby the pair of seal bodies 40, By separating 43, damage to the article 7 or the sealing means can be reduced.

  * By adjusting the height position of the moving frame that supports the first gear 20, the linkage mechanism, the servo motor 17, the servo motor 24, etc. in the sealing device 8 of the horizontal bag making and filling machine, The height positions at which the bodies 40 and 43 sandwich the tubular film 6 can be changed to correspond to articles 7 of various sizes.

In addition to the first and second embodiments, for example, the following configuration may be used.
In FIG. 1, instead of the pair of third gear 26, servo motor 24, drive shaft 27, and drive gear 28, a linear actuator (second control motor) using a motor, a ball screw, etc. A movable member capable of moving and adjusting the intermediate height position in the horizontal direction is provided, and one end portion of each interlocking lever 30 is rotatably supported with respect to the movable member, and the movable member is moved. Alternatively, the pair of rotating levers 19 may be rotated in directions opposite to each other via the pair of interlocking levers 30, and the pair of seal bodies 40, 43 may be moved closer to or away from each other. In this case, the movable member and the interlocking lever 30 correspond to a cooperation mechanism. Also in this configuration, by synchronizing the drive of the servo motor 24 with the drive of the servo motor 17, the upper and lower seal bodies 40, 43 are moved along the imaginary line X as in the first and second embodiments. be able to. In addition, since the second control motor can be composed of a single drive source, the structure can be simplified and the single drive source is also used in terms of synchronization with the servo motor as the first control motor. Therefore, complication of control can be prevented.

-In 1st and 2nd embodiment, although the compression spring which urges | biases the seal body 40 to the seal body 43 side is not provided, you may arrange | position as needed.
-In 1st and 2nd embodiment, although the case where the operation | movement locus | trajectory of a pair of seal bodies 40 and 43 could be adjusted in the sealing apparatus 8 of a horizontal bag making and filling machine was illustrated, it applies to the sealing apparatus of a vertical bag making and filling machine. Is possible.

-In 2nd Embodiment, although the interlocking link mechanism 45 was each arrange | positioned in the lower end part of the right and left rod 38, the interlocking link mechanism 45 may be one.
In the second embodiment, the lower seal body 43 is interlocked with the second gear 22 and the upper seal body 40 is operated by the interlock link mechanism 45. Conversely, the upper seal body 40 is The lower seal body 43 may be operated by an interlocking link mechanism in conjunction with two gears.

  In the first and second embodiments, the fourth gear 33 rotates the interlocking shaft 29 when the interlocking lever 30 swings by driving the servomotor 24. However, the fourth to sixth gears 33, 34, 35 may be disposed on the interlocking shaft 29 and the rotation lever 19 to rotate the interlocking shaft 29 in the same manner.

  -When the pair of seal bodies 40, 43 are engaged with each other, the servo motor position control and torque control may be performed in combination.

  6 ... cylindrical film, 7 ... article, 8 ... sealing device, 17 ... servo motor (first control motor), 19 ... rotating lever (rotating member), 20 ... first gear, 22 ... second gear, 24 ... Servo motor (second control motor), 26 ... Third gear, 29 ... Interlocking shaft, 30 ... Interlocking lever (interlocking member), 33 ... Fourth gear, 40 ... Upper seal body, 43 ... Lower seal body 44 ... Conveyor conveyor (conveyance path).

Claims (5)

A tubular film sealing apparatus facilities to bag filling machine transverse seal by moving together with the conveying of the tubular film by a pair of sealing members which face each other across the conveying path by sandwiching the tubular film of the first gear across the, second gear meshing with the first gear, and a rotating member which the second gear is rotatably supported with pivoting concentrically to the axis of said first gear, said second gear in the first gear connected to the rotary member which extends in the opposite, a linkage mechanism for rotating concentrically to the rotating member to the axis of the first gear, an eccentric position of the second gear and one of the seal body opposite to the other sealing body and the sealing means to open and close operably support a in pivotally supported by said pair of sealing body, a first control motor for driving said first gear, and a second control motor for driving said linkage mechanism, a second control motor Bag making of said rotating member rotates, characterized in that both sealing bodies by the first control motor is arranged capable of modulating the distance between the seal body as it moves together with the conveying of the tubular film I Sealing device for filling machine. The linkage mechanism includes a third gear that is rotated by a second control motor, and an interlocking member that is rotatably connected to the eccentric position of the third gear and the rotating member. The sealing device of the bag making and filling machine according to claim 1. The rotating member and the linkage mechanism are connected by a shaft, and a fourth gear is disposed on the shaft, and the shaft rotates together with the fourth gear by driving the first control motor or the second control motor. The sealing device of the bag making and filling machine according to claim 1 or 2, characterized in that. Detection means for detecting biting of an article by a pair of seal bodies is provided, and the second control motor is driven to rotate the rotation member so that the seal bodies are separated from each other by detection by the detection means. The sealing device for a bag making and filling machine according to any one of claims 1 to 3, wherein the sealing device is used. A sealing device for a horizontal bag making and filling machine, wherein a fixed frame, a moving frame arranged so as to move up and down with respect to the fixed frame, and a position in the height direction of the moving frame with respect to the fixed frame A height adjustment mechanism that can be adjusted, and a first gear, a linkage mechanism, a first control motor, and a second control motor supported on the moving frame, so that the height positions of the pair of seal bodies can be adjusted. It can change, The sealing apparatus of the bag making filling machine as described in any one of Claims 1-4 characterized by the above-mentioned.

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