Clamping mechanism for packaging machine

Abstract

The clamping mechanism for the packaging machine of the present invention is provided with a clamping member (14) at the top of a clamping arm (4) for holding a packaging bag (5). The clamping member is provided with a fixed portion (25) and a movable portion (26) arranged at the top of the clamping arm body (15). The packaging bag is held or released by the fixed portion and the openable and closable movable portion. The fixed portion is provided with a fixed seat (25A) at a part of the top of the clamping arm body, and the fixed seat protrudes toward the packaging bag to be clamped. The movable portion is provided with an assembly seat (26A) at another part of the top of the clamping arm body, and a rotating member (26F) is supported on the assembly seat and can rotate. Thin plate-shaped liquid blocking members (25C, 26C) are relatively mounted on the assembly portions (25B, 26B) arranged at the fixed seat and the top of the rotating member opposite to each other, and the liquid blocking members hold the packaging bag and prevent the liquid from flowing up along one side edge of the packaging bag when the conveyed packaging bag stops intermittently.

Description

Technical Field

[0001] The present invention relates to a clamping mechanism for a packaging machine, and for example, to a clamping mechanism for a packaging machine that can be preferably used in a rotary packaging machine that fills solid materials such as liquids and powders into packaging bags and performs packaging. Background Art

[0002] Conventionally, a rotary packaging machine is known as a packaging machine that automatically fills a packaging bag such as a standing bag with a material to be packaged and seals the bag opening. Figure 1 The present invention is a rotary packaging machine equipped with a clamping mechanism according to an embodiment of the present invention, but the packaging machine itself is the same as a conventional packaging machine. Figure 1 A conventional rotary packaging machine will be described. Figure 1 This is a top view of an example of a rotary packaging machine 1. On the outer periphery of a disc-shaped rotor 3, a pair of clamp arms 4 are radially protruded in multiple groups, and packaging bags 5 are suspended between the pair of clamp arms 4. The rotor 3 rotates intermittently.

[0003] Generally, when a liquid is filled into a packaging bag 5 and packaged using a rotary packaging machine 1 as described above, the liquid may adhere to the sealing surface of the inner surface of the bag opening when it flows down, which may have an adverse effect on the sealing of the bag opening. Therefore, in JP2014-118157A, a gas injection nozzle is provided below the liquid filling nozzle, and when the liquid filling nozzle and the gas injection nozzle are lowered and the injection port and the gas injection port are placed in the packaging bag, pressurized gas is sprayed toward the sealing surface of the packaging bag at the same time as or before the liquid filling starts, so as to remove the liquid attached to the inner surface of the packaging bag.

[0004] However, the rotor 3 of the rotary packaging machine 1 rotates intermittently, and when it stops, Figure 5 As shown, there is a possibility that the liquid in the packaging bag 5 may surge greatly, and the liquid may rise along one side edge of the packaging bag 5 and fly out of the bag opening to dirty the bag surface.

[0005] In addition, depending on the fluidity of the liquid, and the intermittent motion cycle, rotation speed, acceleration and other conditions of the rotor 3, the liquid may resonate and fluctuate greatly, and an unexpected amount of liquid may fly out of the packaging bag, resulting in a shortage of the packaged material. Summary of the invention

[0006] In order to solve the above problems, the clamping mechanism for a packaging machine of the present invention is configured as follows: when a liquid is filled into a packaging bag and when intermittent rotation is performed, the filled liquid is prevented from adhering to the sealing surface on the inner surface of the packaging bag, and when the intermittent rotation stops, even if the liquid in the packaging bag fluctuates, it will not fly out of the packaging bag. In addition, the clamping mechanism of the present invention is also established as a clamping mechanism for a packaging machine that can package solids such as powders in addition to liquids.

[0007] The clamping mechanism for a packaging machine of the present invention comprises a clamping piece at the top end of a clamping arm for holding a packaging bag, the clamping piece comprising a fixed portion arranged at the top end of a clamping arm body and a movable portion that is opened and closed relative to the fixed portion, the movable portion is opened and closed relative to the fixed portion, and the packaging bag is held or released by the fixed portion and the movable portion. The clamping mechanism for the packaging machine is characterized in that the fixed portion is provided with a fixed seat at a part of the top end of the clamping arm body, the fixed seat protrudes toward the packaging bag side to be clamped, and the movable portion is provided with an assembly seat at another part of the top end of the clamping arm body, the rotating member is supported by the assembly seat and can rotate, and liquid blocking members are assembled in a mutually opposing manner at each assembly portion arranged at the fixed seat and the top end of the rotating member opposite to each other, the liquid blocking member holds the packaging bag and prevents liquid from rushing up along one side edge in the packaging bag when the conveyed packaging bag stops intermittently.

[0008] The liquid blocking member blocks the upward passage of the liquid by clamping the upper parts of both sides of the packaging bag, thereby preventing the liquid from flowing upward along one side edge of the packaging bag. However, the clamping mechanism for the packaging machine of the present invention can also package solids such as powders in addition to liquids.

[0009] The clamping mechanism for a packaging machine of the present invention can prevent the liquid in the packaging bag from adhering to the upper sealing surface of the inner surface of the packaging bag and can effectively prevent the liquid from leaking out of the packaging bag by virtue of the above-mentioned structure.

[0010] Furthermore, since this can be realized simply by attaching the liquid barrier member to the clamp of the conventional clamp mechanism, it can be implemented easily and extremely inexpensively. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a top view of the rotary packaging machine.

[0012] Figure 2 It is a bottom view of the clamping mechanism for a packaging machine according to the present invention.

[0013] Figure 3 This is an enlarged view of the top end of the clamp arm.

[0014] Figure 4It is a usage state diagram of the clamping mechanism for a packaging machine of the present invention.

[0015] Figure 5 This is a diagram showing the use status of a clamping mechanism for a conventional packaging machine. DETAILED DESCRIPTION

[0016] (Rotary Packaging Machine)

[0017] First, a rotary packaging machine 1 equipped with a clamping mechanism for a packaging machine of the present invention will be briefly described. However, the present invention is not limited to the rotary packaging machine 1, and may be a linear packaging machine. Figure 1 1 is a top view of a rotary packaging machine 1 having a clamping mechanism 2 for a packaging machine of the present invention described later. Figure 1 In the figure, 3 is a rotor that is intermittently rotated by a driving device. 4 is a pair of clamping arms that hold the upper parts of the packaging bag 5 on both sides to suspend the packaging bag 5. There are 8 sets of clamping arms 4, which are supported on the outer periphery of the rotor 3. When the power of the driving device is transmitted to the central axis of the rotor 3 via an intermittent rotation transmission mechanism (omitted in the figure), the rotor 3 rotates intermittently in a clockwise direction when viewed from above. As described below, the rotary packaging machine 1 is allocated with sections (sections) for packaging operations in the circumferential direction of the rotor 3. In this embodiment, there are 8 sections, but it can also be 10 sections, and is not limited to 8 sections.

[0018] The numbers written on the outer circumference of the rotor 3 represent the sections. S1 is the bag supply section, where the packaging bag 5 is delivered from the bag supply mechanism (bag box) 6 to the clamp at the top of the clamp arm 4. S2 is the bag opening / printing section, where the date, expiration date, etc. are printed on the packaging bag 5, the bag opening is opened, and the finger of the opening mechanism 7 is inserted into the opened bag opening to expand the bag opening. S3 is the filling section, in the case of this embodiment, liquid is injected into the packaging bag 5 from the liquid filling nozzle 8. S4 and S5 are sections for adjusting the shape of the filled packaging bag 5 in the case of a packaged object such as powder, but they are not particularly necessary in the case of liquid, so they do not stop here. S6 is the sealing section, where the bag opening is sealed by the sealer 9. S7 is the cooling section, where the sealed portion in the sealing section S6 is cooled by the cooling device 10. S8 is the unloading section, where the sealed packaging bag 5 is unloaded by the unloading mechanism 11 such as a conveyor.

[0019] Next, use Figure 2 and Figure 3 The clamp arm 4 constituting the clamp mechanism 2 for the packaging machine of the present invention will be described. Figure 2The clamp mechanism 2 for a packaging machine is shown mounted on the bottom surface of a rotor 3 of a rotary packaging machine 1. The clamp mechanism 2 for a packaging machine has a pair of clamp arms 4, and clamps 14 are provided at the top ends of the pair of clamp arms 4. The upper portions of both sides of a packaging bag 5 are clamped by the clamps 14, and the packaging bag 5 is suspended from the pair of clamp arms 4. As described above, packaging operations are performed on the packaging bag 5 suspended from the pair of clamp arms 4 in each section of the rotary packaging machine 1.

[0020] The clamp arm 4 includes a clamp arm body 15 and the clamping piece 14 for clamping the packaging bag 5. The clamp arm body 15 is cylindrical and has a bearing 16 at its base end. The bearing 16 is used to support the clamp arm body 15 on the rotor 3 of the rotary packaging machine 1. The interior of the clamp arm body 15 is a cavity, and a movable rod 17 is inserted into the cavity. The movable rod 17 can reciprocate in the longitudinal direction. A compression spring 18 is externally fitted on the movable rod 17, which always applies force to the movable rod 17 toward the base end side of the clamp arm body 15. A roller pin 19 is mounted near the base end of the movable rod 17. The roller pin 19 protrudes downward from an elliptical opening 20 on the bottom surface of the clamp arm body 15. The roller pin 19 is pressed by a pressing mechanism (not shown) of the rotary packaging machine 1 while resisting the force of the compression spring 18. Due to this pressing, the movable rod 17 is pushed toward the top end of the clamp arm body 15, and the clamping piece 14 opens. A Y-shaped guide member 21 that supports and guides the roller pin 19 is mounted on the base end portion of the clamp arm body 15 .

[0021] Figure 3 1 is an enlarged view of the clamp 14 for clamping the packaging bag 5. The clamp 14 includes a fixed portion 25 and a movable portion 26 provided at the top end of the clamp arm body 15. The fixed portion 25 is integrally provided with a fixed seat 25A at a part of the top end of the clamp arm body 15, and the fixed seat 25A protrudes toward the packaging bag 5 to be clamped, and a mounting portion 25B is provided on the inner side of the fixed seat 25A (the side opposite to the movable portion 26). The liquid blocking member 25C on the side of the fixed portion 25 is fixed to the mounting portion 25B by a fixing tool 25D including a bolt and a nut.

[0022] The movable part 26 is provided with a mounting seat 26A on the clamp arm body 15, and the rotating member 26F is supported by the mounting seat 26A and can rotate. Figure 3 As shown, one end of the rotating member 26F is supported on the top of the assembly seat 26A via the shaft 26G and can rotate. The other side assembly portion 26B is provided inside the top of the movable portion 26, and the liquid blocking member 26C on the movable portion 26 side is fixed to the assembly portion 26B by a fixing device 26D including a bolt and a nut.

[0023] One liquid blocking member 25C on the side of the fixed portion 25 and the other liquid blocking member 26C on the side of the movable portion 26 are assembled in the assembly portion 25B and the assembly portion 26B to be opposite to each other. The liquid blocking member 25C on one side and the liquid blocking member 26C on the other side hold the packaging bag 5, and prevent the liquid from flowing upward when filling the liquid, and prevent the liquid from flowing upward along one side edge of the packaging bag 5 when the transported packaging bag 5 stops intermittently. A pair of liquid blocking members 25C and 26C are composed of thin plate-shaped or rectangular parallelepiped components. One end of the liquid blocking member 25C and 26C is fixed to the assembly portion 25B and 26B, and the other end of the liquid blocking member 25C and 26C is a free end. Figure 4 As shown in the figure, the liquid blocking members 25C and 26C are horizontally mounted in a relative manner toward the center in the width direction of the packaging bag 5. However, the free ends of the liquid blocking members 25C and 26C may be mounted so as to be slightly inclined in either the upward or downward direction. In addition, the lengths of the liquid blocking members 25C and 26C are set to be of a size that prevents the liquid from running up along one side edge of the packaging bag 5. On the inner surface of each liquid blocking member 25C and 26C, elastic members 25E and 26E such as synthetic rubber are mounted that are in close contact with the packaging bag 5 and prevent the packaging bag 5 from sliding.

[0024] The inner side of the central part of the movable part 26 and the top end of the movable rod 17 are connected by the connecting rod 22. As the movable rod 17 is extended and retracted, the movable part 26 rotates around the axis 26G via the connecting rod 22. When the movable rod 17 is extended to the front end side, the clamp 14 is opened. When the compression spring 18 causes the movable rod 17 to retract to the base end side, the clamp 14 is closed, and the front and back surfaces of the packaging bag 5 are gripped by the liquid blocking member 25C on one side and the liquid blocking member 26C on the other side.

[0025] Next, the use of the clamping mechanism 2 for the packaging machine constructed as described above will be described. When the liquid is filled with liquid by the liquid filling nozzle 8 in the filling section S3 of the rotary packaging machine 1, the liquid will rise, but it will not reach the sealing surface set near the opening of the upper end of the packaging bag 5 due to the prevention of the liquid blocking members 25C and 26C. After the liquid is filled, the rotor 3 rotates intermittently, and when it stops intermittently in the sections 4 and 5, as shown in FIG. Figure 5 As shown, the liquid will flow up along one side edge of the packaging bag 5. In this case, whether the liquid flows up or adheres to the sealing surface, not only will a sealing error occur when sealing is performed in the sealing section 6, but the surface of the packaging bag 5 will also be stained by the liquid, so it is necessary to wipe the surface of the packaging bag 5.

[0026] As described above, in the present invention, the upper portions of both sides of the packaging bag 5 are clamped by the liquid blocking members 25C and 26C, such as Figure 4As shown, the liquid blocking members 25C and 26C prevent the liquid from flowing upward along one side edge of the packaging bag 5. That is, by clamping the upper parts of both sides of the packaging bag 5 with the liquid blocking members 25C and 26C to block the liquid, even if the liquid flows upward due to inertia, the liquid passage will be blocked, and the liquid flowing upward can be returned to the packaging bag 5, and the liquid can be prevented from flying out. In addition, the liquid to be packaged is not only a low-viscosity liquid, but also a relatively high-viscosity fluid liquid such as kitchen detergent and shampoo concentrate, and the present invention can be applied.

[0027] Furthermore, even if the above-mentioned liquid barrier members 25C and 26C are provided, solid substances such as powders can be packaged in addition to liquids, and the packaged substances are not limited to liquids.

[0028] Industrial Applicability

[0029] The present invention is useful in the field of packaging machines such as rotary packaging machines that sequentially fill packaging bags with liquid while a rotor is intermittently rotating.

Claims

1. A clamping mechanism for a packaging machine, A clamping member is provided at the top end of a clamping arm for holding a packaging bag, the clamping member includes a fixed portion provided at the top end of a clamping arm body and a movable portion that opens and closes relative to the fixed portion, the movable portion opens and closes relative to the fixed portion, and the packaging bag is held or released by the fixed portion and the movable portion. The clamping mechanism for the packaging machine is characterized in that: The fixing part is provided with a fixing seat at a part of the top end of the clamping arm body, and the fixing seat protrudes toward the packaging bag to be clamped. The movable part is provided with an assembly seat at another part of the top end of the clamping arm body, and the rotating member is supported on the assembly seat and can rotate. Liquid blocking members are mounted on the respective mounting portions disposed opposite to each other at the fixing seat and the top end of the rotating member, and are mounted opposite to each other. The liquid blocking members hold the packaging bag and prevent the liquid from flowing up along one side edge of the packaging bag when the packaging bag being transported stops intermittently. The liquid blocking member is composed of a thin plate or rectangular parallelepiped member mounted toward the center in the width direction of the packaging bag, one end of the liquid blocking member is fixed to the mounting portion, and the other end of the liquid blocking member is a free end.

2. The clamping mechanism for a packaging machine according to claim 1, wherein: The liquid blocking member is equipped with an elastic member for preventing the packaging bag from sliding.

3. The clamping mechanism for a packaging machine according to claim 1, wherein: The liquid blocking member is installed horizontally toward the center in the width direction of the packaging bag, or installed so that the free end of the other end is inclined in any direction upward or downward from one end.

Images