Bag bottom support mechanism for packaging machines

Abstract

To solve the problem in which, in the past, when an item to be packed such as a hard and sharp dried bonito or a slice of meat with a bone is input in a stand pack, pinholes sometimes are opened in the bottom portion of the stand pack, and in a configuration of a bag receiving pedestal, a packed product is not stored well, and when inert gas is injected into a packing bag, the diffusion rate throughout the inside of the bag is poor.SOLUTION: The present invention includes a bag receiving pedestal 3 for, when a stand pack 2 is filled with a packed product, placing and supporting the stand pack, an eccentrically rotatable mechanism 5 pivoting the bag receiving pedestal to a support arm 10L and including a crank 5G, an actuator 5I, and the like, which eccentrically rotate the pivoted bag receiving pedestal, and a lifting pole 6. The bag receiving pedestal 3 includes a base 3A for supporting a bottom portion 2A of the placed stand pack and a mating portion 3B that is provided on the base and fits into a downwardly opening recess portion 2B formed at the bottom of the stand pack. On the top face of the base and the top face of the mating portion, buffer members 3a and 3b are provided for absorbing shock when a hard packed item is filled.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a bag bottom support mechanism for a packaging machine that protects the bottom of a packaging bag when filling the bag with packaged items, and more specifically, to an improvement to a bag bottom support mechanism for a packaging machine that protects the bottom of a free-standing packaging bag, such as a stand pack, that has a bag bottom that is open at the bottom, when hard packaged items are dropped into the bag to fill it. [Background technology]

[0002] Self-supporting packaging bags called stand packs are widely used as packaging bags for packaging foods, etc. As shown in Fig. 8, this type of stand pack is made up of front and back films 2D, 2E whose top and both sides are sealed, and a foldable bottom film 2F between the bottoms of the front and back films 2D, 2E, and is configured such that when the bottom film 2F is unfolded as shown in the figure, a recess 2B that opens downward is formed. This type of packaging bag 2 has the advantage of being self-supporting.

[0003] Incidentally, a rotary packaging machine is known as a device for filling and packaging the packaged items in these packaging bags 2. Patent Document 1 discloses a bag bottom support device that prevents a large impact generated by a packaging bag containing a packaged item from being applied to a gripping device of the packaging bag during rotation of the rotary table and when the rotation starts and stops. The bag bottom support disclosed in Patent Document 1 has a "king"-shaped support part formed of three horizontal bars arranged parallel to each other, with a depression in the center and both sides extending diagonally upward, and a vertical bar connecting these horizontal bars at their centers, and further includes a support shaft that is provided hanging down from the center of the support part, and this support is positioned and fixed at an appropriate position in the vertical direction relative to the bracket. The support part supports the bag bottom from the process of putting solids into the packaging bag until just before the process of discharging it. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-278202 A [Patent Document 2] Publication No. 3162136 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a hard and sharp packaged item, such as dried bonito or meat on the bone, is placed in the stand pack using the bag bottom support as in the document 1, the sharp tip of the packaged item may cause a pinhole to open in the bottom of the stand pack. When a pinhole opens, air or bacteria may enter through the pinhole, causing food spoilage and creating a hygiene problem. In addition, in order to prolong the shelf life of food, an inert gas such as nitrogen gas is filled in the packaging bag, but the inert gas will leak out through the pinhole. Moreover, the bag bottom support in the document 1 only stably supports the bottom of the packaging bag in a fixed position when the packaged item is filled, so the packaged item is not well accommodated, and when an inert gas is injected into the packaging bag, the diffusion rate of the inert gas throughout the bag is poor.

[0006] In response to this, Patent Document 2 proposes a device that gently introduces packaged items, such as raw dried bonito flakes, which are soft and relatively fragile, along an inclined surface while cushioning the impact of a fall. The packaged item introduction device of Patent Document 2 introduces the packaged item gently along an inclined surface, so there is no risk of pinholes opening in the bottom of the packaging bag. However, the packaged item introduction device of Patent Document 2 has the drawbacks of taking a long time to fill and low filling efficiency, as well as problems with filling the inert gas.

[0007] In view of such problems, the present invention aims to provide a bag bottom support mechanism for a packaging machine which eliminates the risk of pinholes developing in the bottom surface of a packaging bag, fits the packaged items well, and has a good diffusion rate of inert gas throughout the entire bag when inert gas is injected into the packaging bag. [Means for solving the problem]

[0008] In order to solve the above problems, the bag bottom support mechanism for a packaging machine of the present invention is provided with a bag support mechanism for supporting a self-supporting packaging bag when filling the self-supporting packaging bag with a package, an eccentric rotation mechanism for eccentrically rotating the bag support mechanism, and a lifting pole having a lifting shaft for raising and lowering the support arm. The bag support mechanism is provided with a base for supporting the bottom of the self-supporting packaging bag placed thereon, and a fitting portion provided on the base for fitting into a recessed portion that is open downward and formed in the bottom of the self-supporting packaging bag, and has an upper surface of the base and an upper surface of the fitting portion. Item to be packaged It is characterized by being equipped with a cushioning material that absorbs the shock when filling the container.

[0009] In addition, in order to protect the bottom of the packaging bag, the bag support base supports the bottom of the self-supporting packaging bag. Placement The fitting portion is a circular plate having a size that can be fitted to the center of the base and opens downward. freestanding packaging bag of It has a truncated cone shape that fits into the recess in the bottom, and a resilient cushioning material made of rubber or foamed plastic is attached to the top surface of the part that fits into the base.

[0010] In addition, in order to improve the fit of the packaged items and the diffusion rate of the inert gas throughout the bag, the eccentric rotation mechanism has a rotating shaft supported by a bearing at the tip of the support arm, an eccentric support body with a long hole drilled therein is attached to the upper part of this rotating shaft, a bag receiving stand is eccentrically attached to the upper part of the eccentric support body, and the lower part of the rotating shaft is connected to an actuator that eccentrically rotates the bag receiving stand. Effect of the Invention

[0011] With the above-mentioned configuration, the bottom of the packaging bag can be protected, the packed items can be better accommodated, and the rate at which the inert gas diffuses throughout the entire bag can be improved. [Brief description of the drawings]

[0012] [Figure 1]Schematic plan view of a rotary packaging machine equipped with a bag bottom support mechanism for packaging machines [Diagram 2] A partially enlarged plan view of a rotary packaging machine equipped with a bag bottom support mechanism for a packaging machine [Diagram 3] A side view of the bag bottom support mechanism for a packaging machine in use. [Figure 4] A plan view of a bag bottom support mechanism for a packaging machine in use. [Diagram 5] A partial side view of a bag bottom support mechanism for a packaging machine in use. [Figure 6] Enlarged cross-sectional view of the bag bottom support mechanism for packaging machines in use [Figure 7] A perspective view of a bag receiving stand of a bag bottom receiving stand mechanism for a packaging machine [Figure 8] FIG. 1 is a perspective view of an example of a stand pack. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (Rotary packaging machine) Before describing the bag bottom support mechanism 1 for a packaging machine of the present invention, a rotary packaging machine 10 to which the bag bottom support mechanism 1 for a packaging machine is attached will be briefly described. The bag bottom support mechanism 1 for a packaging machine is not limited to the rotary packaging machine 10, and may be a linear packaging machine. FIG. 1 is a schematic plan view of the rotary packaging machine 10, in which 10A is a disk-shaped rotor, and 10B is a pair of clamp arms for suspending a packaging bag 2, with eight pairs being supported on the outer periphery of the rotor 10A. Note that the bag bottom support mechanism 1 for a packaging machine is used for a self-supporting packaging bag 2, but may also be expressed as a stand pack 2 or a packaging bag 2 in this embodiment. When the driving force of a drive motor is transmitted to the central axis of the rotor 10A via an intermittent rotation transmission mechanism (both not shown), the rotor 10A rotates intermittently clockwise. In this rotary packaging machine 10, sections for performing packaging work are allocated in the circumferential direction of a rotor 10A, and in the rotary packaging machine 10A of this embodiment, for example, eight sections are evenly allocated.

[0014] The number (1) written on the rotor 10A is the bag supply section, where a bag 3 is sucked up from the bag supply mechanism 11 by a vacuum suction cup 11A and passed to a clamp 10C at the tip of the clamp arm 10B via the bag supply mechanism 11B. The number (2) is the bag mouth opening section, where the mouth of the packaging bag 2 is opened by a suction cup (not shown) of the bag mouth opening mechanism and the process moves to the next filling section (3). In the filling section (3), the packaging bag 2 is filled with the packaged material from a hopper 10D. The bag bottom receiving platform mechanism 1 for a packaging machine of the present invention is provided in this filling section (3).

[0015] Number (4) is a vibration section where the mouth of the packaging bag 2 is closed and the bottom 2A of the packaging bag 2 filled in the filling section (3) is tapped with a vibration plate 10F of a vibration mechanism 10E to place the packaged item in the packaging bag 2. Number (5) is a sealing section where the mouth of the packaging bag 2 is sealed with a sealer 10G. Numbers (6) and (7) are cooling sections where the sealed bag mouth is cooled with a cooling plate 10H to cool the sealed portion of the packaging bag 2 and to neatly shape the sealed surface. Number (8) is an unloading section where the completely packaged bag body 2C is unloaded by a unloading mechanism 10I, for example a belt conveyor.

[0016] (Bag bottom support mechanism for packaging machines) The bag bottom support mechanism 1 for packaging machine of the present invention is installed in the filling section (3) of the rotary packaging machine 10 as described above. FIG. 2 is a plan view of the filling section (3) and the vibration section (4) of the rotary packaging machine 10. The bag bottom support mechanism 1 for packaging machine is disposed on the outer periphery of the rotor 10A. In FIG. 2, the reference numeral 10E denotes a vibration mechanism for the vibration section (4), in which a vibration plate 10F is attached to a support arm 10L fixed to a lifting shaft 10K of a lifting pole 10J, and the lifting shaft 10K is vibrated by a drive mechanism (not shown), and the vibration plate 10F taps the bottom 2A. In addition, 10M denotes a guide plate that guides the packaging bag 2 filled with the packaged item so that it does not shake too much due to centrifugal force when it is conveyed to the next section.

[0017] Fig. 3 is a side view of the bag bottom support mechanism 1 for a packaging machine in use, and Fig. 4 is a plan view. This mechanism 1 includes a bag support 3 on which the self-supporting packaging bag 2 is placed and supported when the self-supporting packaging bag 2 is filled with the packaged material, an eccentric rotation mechanism 5 that supports the bag support 3 on a support arm 4 and eccentrically rotates the supported bag support 3, and a lifting pole 6 having a lifting shaft 6A that moves the support arm 4 up and down. The bag bottom support mechanism 1 for a packaging machine is disposed below the rotor 10A at the position of the outer periphery of the rotor 10A, and the bag support 3 that supports the bottom 2A of the stand pack 2 is disposed so as to be located below the sundpack 2 that is clamped and hung by the clamps 10C of a pair of clamp arms 10B. The bag support 3 is supported by a support arm 4 that constitutes a part of the eccentric rotation mechanism 5, and this support arm 4 is supported by the lifting shaft 6A of the lifting pole 6 so that the vertical position can be adjusted.

[0018] The lifting pole 6 is attached vertically to the base 10N of the rotary packaging machine 10, and a lifting shaft 6A is fitted into the lifting pole 6 so as to be movable up and down, and the lifting shaft 6A is raised and lowered by a drive mechanism such as a crank mechanism (not shown). Reference numeral 6B denotes a fixing clamp for fixing the support arm 4, and the support arm 4 can be fixed horizontally to the lifting shaft 6A by a lever 6C as shown in Figures 3 and 4. The support arm 4 is attached to the lifting shaft 6A via an L-shaped bracket 6D attached to the fixing clamp 6B.

[0019] As shown in Figures 5 and 6, in the eccentric rotation mechanism 5, a rotating shaft 5B is supported vertically via a bearing 5A at the tip of the support arm 4, and an eccentric support 5C having a cross shape in a plan view is attached to the upper end of the rotating shaft 5B. Each rectangular plate 5D constituting the eccentric support 5C has a long hole 5E drilled at a symmetrical position on either side of the rotating shaft 5B, and the bag receiving stand 3 can be eccentrically fixed to any position of the long hole 5E by a bolt 5F. The amount of eccentricity of the bag receiving stand 3 can be changed by changing the mounting position of the bag receiving stand 3 relative to the eccentric support 5C.

[0020] A crank 5G is attached to the lower end of the rotating shaft 5B, and a piston rod 5J of an actuator 5I such as an air cylinder is connected to the tip of the crank 5G via a joint arm 5H. The rear end of the air cylinder 5I constituting the eccentric rotation mechanism 5 is swingably suspended from the support arm 4 by a cylinder mounting plate 5K. The reciprocating motion of the piston rod 5J rotates the rotating shaft 5B, and the bag receiving stand 3 fixed to the rotating shaft 5B in an eccentric state rotates eccentrically. Although an air cylinder has been described as the actuator 5I, it is not limited to an air cylinder and may be another driving mechanism such as a motor.

[0021] 7, the bag receiving stand 3 is composed of a circular base 3A on which the stand pack 2 is placed, and a truncated cone-shaped fitting portion 3B that is formed in the center of the circular base 3A and fits into a recess 2B that opens downward on the bottom surface of the stand pack 2. A donut-shaped elastic cushioning member 3a made of rubber or foamed plastic is attached to the surface of the base 3A. A similar cushioning member 3b is also attached to the surface of the fitting portion 3B.

[0022] 5 and 6, with the bag receiving stand 3 configured as above, the fitting portion 3B fits snugly into the recess 2B opening downward at the bottom of the bottom 2A of the stand pack 2 to protect the bottom 2A, and the base 3A supports the lower edges of the front and back films 2D and 2E of the stand pack 2. Since the elastic cushioning members 3b and 3a are attached to the surfaces of the fitting portion 3B and the base 3A, even if a hard packaged item is dropped and filled into the stand pack 2, the bottom 2A of the stand pack 2 is protected by the cushioning members 3b and 3a of the bag receiving stand 3, so that the impact of the drop is softened and holes such as pinholes or tears are prevented from opening.

[0023] Furthermore, when the air cylinder, which is the actuator 5I, is operated, the piston rod 5J reciprocates, and the rotating shaft 5B is rotated by the crank 5G, which also rotates the eccentric support 5C. When the eccentric support 5C rotates, the bag receiving stand 3, which is eccentrically attached to the eccentric support 5C, rotates eccentrically, and the packaged items filled in the stand pack 2 are shaken, improving the fit inside the stand pack 2. Furthermore, if an inert gas such as nitrogen gas is injected at this time, the entire bag is shaken horizontally, so that the gas reaches every corner of the bag, improving the replacement efficiency.

[0024] In the above, the piston rod 5J reciprocates and the rotating shaft 5B is rotated by the crank 5G, thereby causing the eccentric support 5C to rotate. However, in the present invention, the rotation does not have to be in one direction, and the eccentric support 5C may also rotate in the forward and reverse directions.

[0025] In addition, the structure for eccentrically rotating the bag receiving stand 3 is configured to offset the center of rotation of the eccentric support body 5C from the center of rotation of the bag receiving stand 3 using a long hole 5E drilled in the eccentric support body 5C, but it may also be configured to simply offset the center of rotation without using the long hole 5E. [Industrial Applicability]

[0026] As described above, the present invention can be used in devices such as rotary packaging machines that load and fill hard packaged items into self-supporting packaging bags such as stand packs. [Explanation of symbols]

[0027] 1. Bag bottom support mechanism for packaging machines 2. Stand-up packaging bags (stand packs) 2A bottom 2B Recess 2D Surface Film 2E Back film 2F Bottom film 3 Bag holder 3A base 3a Buffer member 3B Mating part 3b Buffer member 4 Support Arm 5 Eccentric Rotation Mechanism 5A Bearing 5B Rotation axis 5C eccentric support 5D plate 5E long hole 5F Bolt 5G Crank 5H joint arm 5I Actuator (Air Cylinder) 5J piston rod 5K Cylinder mounting plate 6 Lifting pole 6A Lifting shaft 6B Fixed clamp 6C Lever 6D Bracket

Claims

1. A bag bottom support mechanism for a packaging machine, comprising: a bag support table on which a self-supporting packaging bag is placed and supported when filling the self-supporting packaging bag with a packaged item; an eccentric rotation mechanism for eccentrically rotating the bag support table by pivotally supporting the bag support table on a support arm; and a lifting pole having a lifting shaft for raising and lowering the support arm, The bag receiving platform comprises a base that supports the bottom of the self-supporting packaging bag placed on it, and a fitting portion that is provided on the base and fits into a downwardly opening recess formed in the bottom of the self-supporting packaging bag, and the bag bottom receiving platform mechanism for a packaging machine is characterized in that the upper surface of the base and the upper surface of the fitting portion are provided with cushioning materials that absorb impacts when filling the packaged items.

2. 2. The bag bottom support mechanism for a packaging machine as described in claim 1, characterized in that the bag support base is a circular plate of a size on which the bottom of a self-supporting packaging bag can be placed, the fitting portion is a truncated cone that protrudes from the center of the base and fits into a recess in the bottom of the self-supporting packaging bag that opens downward, and an elastic cushioning material made of rubber or foamed plastic is attached to the upper surfaces of the base and the fitting portion.

3. 2. The bag bottom receiving platform mechanism for a packaging machine according to claim 1, characterized in that the eccentric rotation mechanism has a rotating shaft supported via a bearing at the tip of the support arm, an eccentric support body having a long hole drilled therein is attached to the upper part of the rotating shaft, a bag receiving platform is eccentrically attached to the upper part of the eccentric support body, and a lower part of the rotating shaft is connected to an actuator that eccentrically rotates the bag receiving platform.

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