JP2550143B2 - Pressing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pressing device used, for example, for welding and sealing a sheet-like lid on a synthetic resin container.

[Conventional technology]

As a pressing device used for the purpose of welding and sealing a sheet-like lid to the upper end opening of a synthetic resin container that stores dairy products, it supports the flange of the upper end of the container from below and There is a method in which the opening of the upper end of the container on which the body is placed is pressed and heated from above by a pressing body to weld and seal the lid to the upper end of the container.

In such a device, the pressing body 3 is set so that it can be swung to some extent, as shown in FIG. This is because, for example, the flange thickness is not formed uniformly, some deformation occurs, or irregularities are formed.
This is because the lower surface of the pressing body 3 may not be parallel to the upper end surface of the container. If the lower surface of the pressing body 3 and the upper end surface of the container are not parallel, it is impossible to uniformly press the entire upper end surface of the container, so that sufficient sealing is not partially performed, and as a result, the sealing is incomplete. .

Therefore, in the prior art shown in FIG. 7, when the center upper surface of the pressing body 3 is pressed and the pressing body 3 is held by a plurality of holding pieces 29 through which the spring 28 is inserted and the upper end surface of the container is pressed. The pressing body 3 is inclined at an angle corresponding to the upper end surface of the container so that the entire upper end surface of the container can be pressed.

[Problems to be Solved by the Invention]

However, this conventional technique has a fatal defect that the lid body is largely displaced from the upper end surface of the container due to the pressing by the pressing body 3.

This is because in this conventional device, the pressing force from the cylinder is applied to the upper surface of the pressing body 3. For example, assuming that the tilt angle of the pressing body 3 corresponding to the inclination of the container is θ, the relationship between the deviation (x) of the center of the lower surface of the pressing body 3 and the distance (l) from the work fulcrum of the balancer to the lower surface of the pressing body 3. Is represented by x = 1 / sin θ, and the magnitude x of the shift is proportional to the length of the distance l. Therefore, the larger l is, the larger the deviation x is.

In this way, when the lid is weld-sealed to the container whose upper end surface is inclined by using the conventional device, first, the pressing body 3 which is kept horizontal is lowered, and the container on which the lid is placed is placed above the container. Abut the part. Then, when the pressing body 3 is further lowered, the uppermost portion of the container is further pressed and the container starts to be inclined at an angle corresponding to the inclination of the container. Since the inclination at this time is achieved by laterally shifting the lower surface of the pressing body 3, the lid body whose uppermost portion is pressed by the pressing body 3 shifts together with the pressing body 3.
And in the positional relationship where the container and the lid are displaced,
A welded seal will be achieved.

Also, in a so-called ring seal in which a pressing surface protruding in a cylindrical shape is formed on the lower surface of the pressing body to achieve a seal on a seal land which is also formed in a ring shape, the pressing body is inclined to cause a ring-shaped pressing force. The surface may be displaced from the seal land, making it impossible to achieve a reliable welded seal.

Further, not only in the case of welding and sealing, but also in the case where a printing sheet is placed on the upper end surface of a box or the like and a so-called hot stamp for pressing from above is applied, for example.
It is necessary to prevent the print sheet from shifting.

It is an object of the present invention to provide a pressing device that can perform accurate processing without causing a displacement or the like between the lid or printed sheet and the object to be processed such as a container or a box. .

[Means for solving the problem]

Therefore, a supporting rod 2 having a universal joint 6 at the lower end is hung from the base plate 1 which is displaced downward by the pressing force from the cylinder 5. And with the universal joint 6,
The lower end of the center of the three-dimensional pressing body 3 having a heat exchange function was held. Further, a plurality of balancers 4 for controlling the posture of the pressing body 3 are hung from the base plate 1 and elastically contacted with the pressing body 3.

Inside the pressing body 3, a welding part 7 for heating and welding the object to be processed, a cooling part 8 for cooling, or both are provided, for example, a welding part 7 for heating and welding the object to be processed at the peripheral end portion.
And a cooling unit 8 for cooling the object to be processed in the center
Can be provided.

In addition, an elastic material piece 9 made of an elastic material may be provided on the pressing surface of the lower surface of the pressing body 3.

Further, when one end of the rotation preventing piece 10 is fixed to one of the pressing body 3 and the base plate 1, and the other end is fitted and assembled in the assembly hole 12 in which the elastic body 11 is attached to the inner peripheral surface which is the other. good.

In actual use, a guide rod 14 is provided, the upper part of which slides in a hole formed at the peripheral end of the base plate 1 and the lower end of which is fixed to a mounting plate 13 located below the base plate 1 so as to face it. The guide rod 14 is fitted with an elastic material 15 whose upper end abuts on the lower surface of the base plate 1 and whose lower end abuts on the mounting plate 13, and further, a single shaft of a slide receiving plate 16 on which the mounting plate 13 is slidably mounted. The bearing 17 may be rotatably fixed and the other end may be connected to the vertical cylinder 18.

[Action]

Description will be given with reference to FIG. First, cylinder 5
In the state in which the pressing force from is not applied, the pressing body 3 is held by the universal joint 6 at the lower end portion of the support rod 2, and its posture is pressed by the plurality of balancers 4 with equal force on the peripheral end portion. It is usually kept horizontal by

Next, when a pressing force from the cylinder 5 is applied to the base plate 1, the base plate 1 is displaced downwardly, and at the same time, the support rod suspended from the base plate 1
2, and the pressing body 3 held by the support rod 2 is displaced downward, and the lower surface of the pressing body 3 presses the upper end surface of the object to be processed such as the container 44.

At this time, if the upper end surface of the container 44 is not positioned parallel to the lower surface of the pressing body 3 because the flange thickness of the container 44 is not uniform, for example, the pressing body 3 that has descended while maintaining horizontal The lower surface of the container first contacts the uppermost portion of the upper surface of the container 44. Then, as the descent further proceeds, the lower surface of the pressing body 3 is inclined along the inclination of the upper end surface of the container 44. This tilting is possible because the pressing body 3 is swingably held by the universal joint 6 and the balancer 4 freely expands and contracts to prevent the pressing body 3 from tilting.

The pressing body 3 has its center lower end portion supported by the support rod 2.
The distance l between the working fulcrum of the universal joint 6 and the lower surface of the pressing body 3 is extremely small, so x = 1
-There is almost no deviation of the lower surface of the pressing body 3 represented by sin θ.

Further, at this time, since the rotation stopping piece 10 of the pressing body 3 is fitted in the mounting hole 12, the pressing body 3 is not displaced in the circumferential direction. Furthermore, since the elastic body 11 is mounted on the inner peripheral surface of the assembly hole 12, the detent piece 10 can be swung to some extent by the elastic force of the elastic body 11, so that the detent piece is prevented. 10 does not hinder the inclination of the pressing body 3.

As a result of the operation described above, the problem that the lid 45 is displaced due to the inclination of the upper end surface of the container 44 is solved.

〔Example〕

This will be described with reference to the drawings. 1 to 4
1 shows an embodiment of a pressing device according to the present invention. In the present embodiment, two pressing devices are installed in parallel on the same mounting plate 13 to weld and seal the two containers 44 at the same time.

The mounting plate 13 and the base plate 1 holding the pressing body 3 are assembled by setting the guide rods 14 upright from the mounting plate 13 and inserting the coiled elastic material 15 into the base plate 1. A hole is provided in the portion, and a cylindrical guide cylinder 19 is attached to this hole. The guide cylinder 19 is attached to the guide rod 14 so as to be slidable and incapable of slipping out. This guide tube
A bush 20 is attached to the inner peripheral surface of 19 so that sliding movement with the guide rod 14 can be performed smoothly.

The balancer 4 is provided at two positions opposite to each other from the center of the base plate 1, and the resiliences thereof are set equally so that the pressing body 3 is kept horizontal.
Similarly, two rotation stopping pieces 10 are also provided at positions facing each other. As shown in FIG.
It is fixed to the pressing body 3 side immovably, and the mounting hole 12 is attached to the base plate 1 side.
However, the formation positions of both may be reversed.

In the present embodiment having the above-mentioned configuration, when the pressing body from the cylinder 5 is not operating, the elastic force of the elastic material 15 pushes the guide cylinder 19 up to its upper limit, and the guide cylinder 19 accordingly. Base plate 1, support rod 2, balancer 4, anti-rotation piece 10,
Both the pressing body 3 and the like are located at the upper limit position. Then, the posture of the pressing body 3 at this time is kept horizontal by the balancer 4.

When the pressing force of the cylinder 5 acts, the base plate 1, the guide cylinder 19, the support rod 2, the balancer 4, the detent piece 10, and the pressing body 3 are displaced downward while countering the elastic force of the bullet 15. Then, as described in the section of the action, the pressing body 3 is inclined along the inclination of the container 44, and the lid 45 is welded and sealed to the upper end surface of the container 44 while preventing the displacement thereof.

In this embodiment, the mounting plate 13 has a bearing 17 on one side thereof.
It is slidably attached to the slide receiving plate 16 supported by the so that the pressing device can be attached and detached very easily. And this slide receiving plate 16
One end of is held by a bearing 17 so as to be vertically rotatable, and the other end is connected to a vertical cylinder 18.

When removing the pressing device, first, the slide receiving plate 16 is pulled up by the vertical cylinder 18. Since the other end of the slide receiving plate 16 is fixed by the bearing 17, one end of the slide receiving plate 16 and the pressing device slidably attached to the slide receiving plate 16 are pulled up in an inclined posture. Next, when these are lifted up to be pulled out from the opening of the closed frame, the handle 27 is pulled toward you. As a result, the mounting plate 13 slides on the slide receiving plate 16 to protrude from the opening of the hermetically sealed frame body, and is pulled out of the slide receiving plate 16 by pulling the handle 27.

In order to mount the pressing device, a new pressing member 3 may be attached after removing only the pressing member 3 in a state where the above-mentioned pressing device is projected from the hermetically sealed frame body, or a mounting plate.
Instead of the pressing device removed together with 13, a new mounting plate 13 may be attached to the slide receiving plate 16. When the pressing device is replaced, the mounting plate 13 is slid in the opposite direction on the slide receiving plate 16 and then returned to the original horizontal position by the vertical cylinder 18, thereby completing the replacement process. The mounting plate 13 and the slide receiving plate 16 are provided with an engagement function for setting the assembly limit position of both.

In addition, in this embodiment, a pressure piece 21 that can be brought into contact with and separated from the cylinder 5 rod is provided on the base plate 1, and a locking hole 22 formed on this pressure piece is formed on the lower end surface of the cylinder 5 rod. By fitting the protruding pieces that are attached, the assembly of both is prevented from coming off due to unexpected external pressure.
In the process of replacing the pressing device described above,
By assembling the cylinder 5 rod and the pressure piece 21 by lifting and displacing the cylinder 5 rod.

FIG. 4 shows the internal structure of the pressing body 3 in the above embodiment. The pressing device according to the present embodiment has a lid 45.
Since it is for welding and sealing the top of the container,
A heater 23 for welding is built in the peripheral end portion of the pressing body 3, and a welding piece that conducts heat from the heater 23 to the lid is provided immediately below the heater 23. Further, 15 pieces 9 of an elastic material such as silicon rubber are provided on the lower surface of the welding piece. By providing the elastic material 15 pieces 9, even if there is some unevenness or the like on the upper end surface of the container or the lid 45, the elasticity of the elastic material 15 pieces 9 achieves a uniform and reliable welding seal. It is something that can be done.

The central portion of the pressing body 3 has an angular function.
An inlet through which cooling water is sent to the upper end of one side of the pressing body 3.
24 is provided, and the cooling water injected from the injection port 24 is discharged from the discharge port 25 through the cooling water channel 26 including the cooling unit 8 at the lower end of the pressing body 3.

With such a configuration, only the portion of the lid body 45 necessary for the welding seal is heated and welded, while the portion which is not necessary for the welding seal and is apt to be deformed due to the heat of the welding seal is cooled. However, it is intended to prevent such deformation.

The internal structure of the pressing body 3 is not limited to the above embodiment, and may be, for example, a portion that heats the entire lower end surface, or conversely, a cooling unit 8, depending on the application.
Furthermore, the formation positions of the heating unit and the cooling unit 8 can be reversed.

FIG. 5 shows an aseptic filling and packaging apparatus provided with the pressing device of the present invention. This device is roughly divided into a container sterilizer 30 and a filling and sealing device 31.

The container sterilizer 30 includes an airtight frame 32 that is a sterile chamber.
Then, a container supplier 33 for sequentially supplying a container 44, a sterilizing agent insertion port 34 such as hydrogen peroxide, an ultraviolet irradiation device 35, a hot air supply duct 3
6, and the hot air suction duct 37 is attached. In the airtight frame 32, at least a pair of transfer rails arranged horizontally and in parallel are provided, and the rails hold the container supplied from the container supply body in a hanging manner. The container 44 held on the rails is intermittently moved by a push plate that stands and is fixed at regular intervals on an endless chain that runs intermittently under the rails along the rails.

First, the container that moves intermittently on the rail is the sterilizing agent insertion port 34
The sterilizing treatment is performed by spraying a sterilizing agent from the above, followed by irradiation with ultraviolet rays from the ultraviolet irradiating device 35, and then is conveyed to the completely dried filling and sealing device 31 by blowing hot air.

The filling and sealing device 31 includes a sealing frame 38 which is a sterile chamber.
In addition, the contents filling machine 39, the lid sterilization device 40, the pressing device 41 that achieves the welding seal according to the present invention, the first positioning portion 42, the second positioning portion 43, the transportation rail, and the comb tooth body, etc. It is configured by assembling.

The container conveyed from the container sterilizer 30 is held on a rail in a hanging manner, and is transferred to a position right below the filling machine 39 by a comb tooth body that draws a square movement locus, and the filling machine 39 fills the contents in an aseptic state. . The container 44 filled with the contents is transferred to a position right below the lid sterilizer 40 by the comb teeth body, and after the positioning and posture of the lid 45 are regulated by the first positioning section 42, the lid sterilizer The lid 45 supplied from 40 is temporarily fixed to the opening of the upper end surface of the container 44. The container 44 to which the lid 45 is temporarily fixed is then transferred to directly below the pressing device 41, where the second positioning section 43 positions and regulates the posture of the container 44, and the welding land of the lid 45 is used. With a certain flange supported from below, the lid 45 by the pressing device 41
The welded seal of is achieved.

In this way, the container 44 with the lid 45 weld-sealed is pushed out of the hermetically sealed frame 38 by the next container that is newly weld-sealed and transported on the rail, and the whole process is completed.

The pressing device according to the present invention is not limited to the use of an aseptic filling and packaging device, and it is necessary to make the pressing surface correspond to the inclination angle of the object to be processed such as the hot stamp or the press-fitting press described above. It can also be used in various technical fields.

〔The invention's effect〕

Thus, in the pressing device of the present invention, the pressing body 3
Since the center lower end portion of the container is swingably held by the universal joint 6 at the lower end portion of the support rod 2, even if the upper end surface of the object to be processed such as the container is inclined, the pressing body 3 is inclined according to the inclination. At the same time, the distance between the work fulcrum of the universal joint 6 and the lower surface of the pressing body 3 can be made extremely small, so that the displacement of the lower surface of the pressing body 3 hardly occurs.

Further, by providing the balancer 4 that elastically contacts the upper surface of the pressing body 3 from the lower surface of the base plate 1, the posture of the pressing body 3 is properly maintained, and the inclined posture corresponding to the inclination of the object to be processed of the pressing body 3 is not required. Achieved without hindrance.

Furthermore, an assembly hole for attaching the rotation stopper piece 10 to the elastic body 11
By being fitted and assembled in 12, the elastic body 3 does not rotate in the circumferential direction and is not welded in a state in which the lid body 45 and the like are displaced, and the inclined posture of the pressing body 3 is not hindered at all.

As a result, the conventional problem that the lid 45 and the like are displaced and welded and sealed due to the inclination of the upper end surface of the object to be processed such as the container is solved, and the pressing step such as the welding and sealing is always performed reliably. It is something that can be done.

[Brief description of drawings]

1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 shows an internal structure of a pressing body 3 which is a constituent feature of the present invention. Sectional view, FIG. 5 is a block diagram showing an aseptic filling and packaging apparatus to which the device of the present invention is attached, FIG. 6 is an explanatory view showing the operation of the present invention, and FIG. 7 is an explanatory view showing the operation of the prior art. Explanation of reference numerals 1: Base plate, 2: Support rod, 3: Pressing body, 4: Balancer, 5: Cylinder, 6: Universal joint, 7: Welding part, 8: Cooling part, 9: Ammunition piece, 10: Around Stopper, 11: Elastic body, 12: Assembly hole, 13: Mounting plate, 14: Guide rod, 15: Elastic material, 16: Slide support plate, 17: Bearing, 18: Vertical cylinder, 19: Guide tube, 20 : Bush, 21: Pressurizing piece, 22: Locking hole, 23: Heater, 24: Inlet, 25: Outlet, 26: Cooling channel, 27: Handle, 28: Spring, 29: Holding piece, 30: Container Sterilizer, 31: Filling and sealing device, 32: Airtight frame, 33: Container supply, 34: Sterilizer insertion port, 35: Ultraviolet irradiation device, 36: Hot air supply duct, 37: Hot air suction duct, 38: Sealing frame Body, 39: Filling machine, 40: Lid sterilizer, 41: Pressing device, 42: First positioning part, 43: Second positioning part, 44: Container, 45: Lid.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuyuki Mogi 380 Sannomiya, Isehara City, Kanagawa Prefecture, Yoshino Industry Co., Ltd.Kanagawa Plant (72) Inventor Tadashi Hanada, 380, Sannomiya, Isehara City, Kanagawa Prefecture, Yoshino Industry Co., Ltd., Kanagawa Plant ( 72) Inventor Mamoru Fujita 3-2-6 Oshima, Koto-ku, Tokyo Inside Yoshino Industry Co., Ltd.

Claims (6)

(57) [Claims] 1. A base plate (1) which is displaced downward by a pressing force from a cylinder (5), and a support rod (2) which is hung from the base plate (1) and has a universal joint (6) at its lower end. And the lower end of the central portion of the three-dimensional body located directly below the base plate (1) and having a heat exchange function is swingably held by the universal joint (6) at the lower end portion of the support rod (2). A pressing device comprising a pressing body (3) and a balancer (4) suspended from the base plate (1) and elastically contacting the pressing body (3) to regulate the posture of the pressing body (3). 2. The pressing device according to claim 1, wherein a pressing part (3) is provided with a welding part (7) for heating and welding the object to be processed, a cooling part (8) for cooling, or both. 3. The pressing device according to claim 1, wherein an elastic material piece (9) made of an elastic material is provided on the pressing surface of the lower surface of the pressing body (3). 4. A set in which one end of a rotation stopping piece (10) is fixed to one of the pressing body (3) and the base plate (1) and the other end is attached with an elastic body (11) on the inner peripheral surface of the other. Mounting hole (12)
The pressing device according to any one of claims 1, 2, and 3, wherein the pressing device is fitted in and assembled to. 5. A guide rod (an upper part of which slides in a hole formed in a peripheral end of the base plate (1) and a lower end of which is fixed to a mounting plate (13) located below the base plate (1). The elastic material (15), the upper end of which abuts on the lower surface of the base plate (1) and the lower end of which abuts on the mounting plate (13), is attached to 14). Pressing device. 6. A slide receiving plate (16) having a mounting plate (13) slidably mounted, one end of which is rotatably fixed by a bearing (17) and the other end of which is connected to a vertical cylinder (18). The pressing device according to claim 1, 2, 3, 4, or 5.