JP2003081217A - Center sealer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center sealer with which tightness of a packaging member for packaging a work can be adjusted according to various needs. SOLUTION: The center sealer 10 includes a conveyer 30 for carrying a work 22 together with a packaging member 24. Respective pairs of upstream feed rollers 40, heat blocks 50, center seal rollers 60 and downstream feed rollers 70 are supported above it in the sequence from its upstream. A pair of plate- formed pressing members 80 are provided immediately below the devices 40, 50, 60 and 70, and a gap 82 is formed between the pressing members 80. The pressing members 80 can be moved and adjusted in a widthwise direction respectively, thereby allowing a width of the gap 82 to be appropriately changed. By adjusting the width of the gap 82, an area of a sealing margin 27 is regulated, and tightness is regulated as a result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center seal device in a packaging machine, and particularly to a technique including a center seal device for wrapping a work in a tubular shape with a packaging member and sealing both side edges thereof. It belongs to the field.

[0002]

2. Description of the Related Art In a center seal device, both side edges of a packaging member in which a periphery of a work is wrapped in a tubular shape are overlapped with each other, and the overlapping portion, so-called "sealing margin", is heated and immediately after that pressure is applied. By welding (seal)
It is what makes me. To describe one example thereof, the center seal device includes a pair of heat blocks that heat the seal margin, and a center seal roller that sandwiches the seal margin softened by heating and pressurizes and seals the seal margin. On the upstream side of the heat block, an upstream side feed roller for guiding the downstream side while sandwiching the left and right side edges with a pair of rollers and forming a sealing margin is provided. A downstream side feed roller for guiding the sealing margin further downstream is provided on the downstream side.

Immediately below these various members such as rollers,
A pressing member for pressing the packaging member corresponding to the upper surface of the work is provided. The pressing member is composed of a pair of flat plates, and a gap having a predetermined width is formed between them. On the other hand, the work is conveyed while being placed on the conveyor together with the packaging member. More specifically, the packaging member is conveyed in a cylindrically wound state around the work,
At the time of this conveyance, both side edges of the packaging member are located on the upper surface side of the work and are projected upward.

As described above, in the center seal device, the packaging member corresponding to the upper surface of the work comes into contact with the back surface of the pressing member, and both side edges of the packaging member protrude from the gap between the pair of pressing members. It is transported in the state. Then, the both side edge portions are first sandwiched by the upstream side feed roller and are overlapped with each other as they rotate to form a seal margin. Next, the sealing margin passes between a pair of heat blocks, and along with this passage, the sealing margin is heated to a predetermined temperature and softened to the extent that welding is possible. Immediately after that, the softened seal margin is sandwiched between a pair of center seal rollers and pressed. As a result, welding is performed (seal).

[0005]

In the case of applying the center seal as described above, the degree to which the packaging member clamps the work, so-called tightness, becomes an important issue. That is, if the tightness is loose, it will be in a loosely packed packaging state, and conversely, if the tightness is tight,
The work will be in a packaged state with a load.

However, in the above technique, the tightness is uniquely determined, and in reality, it cannot be adjusted according to various needs.

The present invention has been made in view of the above problems, and an object thereof is to provide a center seal device capable of adjusting the tightness of a packaging member for packaging a work according to various needs. That is one of the purposes.

[0008]

Means for Solving the Problems and Effects Thereof The characteristic means for achieving the above object will be described below. Also, for each of the means, characteristic actions and effects will be described as necessary.

Means 1. In a center seal device capable of sealing the sealing margin in a state where the sealing margin is formed by overlapping the both side edges of the sheet-like packaging member conveyed in a state of wrapping the work, on both sides of the sealing margin. In order that the packaging member may be conveyed along or substantially along the corresponding work, a pressing member provided with a gap between the sealing margins may be provided, and the width of the gap can be adjusted. A center seal device characterized in that

According to the means 1, the seal margin is formed by overlapping the both side edges of the sheet-like packaging member which is conveyed in the state in which the work is wrapped, and in this state, the seal margin is sealed. By doing so, a center seal is applied. Further, the pressing members are arranged on both sides of the seal margin with a gap therebetween, and the pressing members convey the packaging members on both sides of the seal margin along or substantially along the corresponding works. . Now, with this means, the width of the gap can be adjusted, and by making the width relatively narrow, the area of the sealing margin becomes small, and the degree to which the packaging member tightens the work, so-called tightness is loose. Will be things. On the other hand, by making the width relatively wide, the area of the sealing margin becomes large and the tightness becomes tight. Thus, the tightness can be adjusted according to various needs by appropriately adjusting the width of the gap.

Means 2. In a state where the work is arranged at a predetermined interval on the sheet-shaped packaging member, the conveyor that can convey the packaging member and the work, and both side edges of the packaging member that is conveyed in the state where the workpiece is wrapped are overlapped with each other. In a center seal device having a sealing means capable of sealing by at least pressurizing the sealing margin formed in 1., the packaging members on both sides of the sealing margin are conveyed along or substantially along the corresponding work. Like
A center seal device characterized in that a pressing member is provided on both sides of the sealing margin with a clearance provided therebetween and the width of the clearance can be adjusted. In addition, in place of "at least by pressurizing" in the above means 2, "by softening and pressurizing" may be carried out, or "by heating and pressurizing" may be carried out.

According to the means 2, the wrapping member and the work are conveyed by the conveyor in a state where the work is arranged on the sheet-like wrapping member at predetermined intervals. Further, the sealing margin formed by overlapping the both side edges of the packaging member conveyed with the work wrapped therein is sealed by being at least pressurized by the sealing means. In such a center seal device, pressing members are arranged on both sides of the sealing margin with a gap therebetween, and the pressing members convey the packaging members on both sides of the sealing margin along or substantially along the corresponding work. The Rukoto. Now, with this means, the width of the gap can be adjusted, and by making the width relatively narrow, the area of the sealing margin becomes small, and the degree to which the packaging member tightens the work, so-called tightness is loose. Will be things. On the other hand, by making the width relatively wide, the area of the sealing margin becomes large and the tightness becomes tight. Thus, the tightness can be adjusted according to various needs by appropriately adjusting the width of the gap.

Means 3. In a state where the work is arranged at a predetermined interval on the sheet-shaped packaging member, the conveyor that can convey the packaging member and the work, and both side edges of the packaging member that is conveyed in the state where the workpiece is wrapped are overlapped with each other. In the state where the sealing margin is formed by, a center seal provided with a feeding means for sending the sealing margin to the downstream side at the same speed as the moving speed of the conveyor, and a sealing means capable of sealing by at least pressurizing the sealing margin. In the apparatus, the packaging members on both sides of the sealing margin are provided with pressing members arranged on both sides of the sealing margin so as to be conveyed along or substantially along the corresponding work, A center seal device, wherein the width of the gap is adjustable. In addition, in place of "at least by pressurizing" in the above means 3, "by softening and pressurizing" may be carried out, or "by heating and pressurizing" may be carried out.

According to the means 3, the wrapping member and the work are conveyed by the conveyor in a state where the work is arranged on the sheet-like wrapping member at predetermined intervals. Further, in a state in which both side edges of the packaging member conveyed in a state of wrapping the work are overlapped with each other to form a seal margin, the seal margin is fed to the downstream side at the same speed as the conveyor moving speed by the feeding means. To be Further, the sealing margin is sealed by being at least pressurized by the sealing means. In such a center seal device, pressing members are arranged on both sides of the sealing margin with a gap therebetween, and the pressing members convey the packaging members on both sides of the sealing margin along or substantially along the corresponding work. The Rukoto. Now, with this means, the width of the gap can be adjusted,
By making the width relatively narrow, the area of the sealing margin becomes small, and the degree to which the packaging member tightens the work,
The so-called tightness becomes loose. On the other hand, by making the width relatively wide, the area of the sealing margin becomes large and the tightness becomes tight. Thus, the tightness can be adjusted according to various needs by appropriately adjusting the width of the gap.

Means 4. The center seal device according to means 3, wherein the feeding means is provided at least on the upstream side of the sealing means.

According to the means 4, since the feeding means is provided at least on the upstream side of the sealing means, the feeding is performed while the sealing margin is properly formed, and there is a deviation between the feeding by the conveyor and the feeding. This prevents problems caused by the above.

Means 5. The center seal device according to means 3, wherein the feeding means is provided on the upstream side and the downstream side of the sealing means.

According to the means 5, in addition to the function and effect of the means 4, the sealing margin can be stably sent together with the conveyance by the conveyor.

Means 6. The center seal device according to means 4 or 5, wherein the pressing member extends along the feed direction of the seal margin at least from the upstream feed means to the seal means.

According to the means 6, since the pressing member extends along the feeding direction of the sealing margin at least from the upstream feeding means to the sealing means, the tightness is adjusted more reliably. Will be sealed with.

Means 7. 7. The center according to any one of the means 3 to 6, wherein the feeding means is configured not only to feed the sealing margin but also to apply a stress in a direction of tightening the packaging member to the sealing margin. Sealing device.

According to the means 7, the feeding means applies a stress to the sealing margin in the direction in which the packaging member is tightened. Therefore, when there is a need to make the tightness relatively tight, the presser foot is pressed. The tightness can be adjusted together with the adjustment of the width of the gap between the members.

Means 8. The sealing means includes a heating means for heating and softening the sealing margin, and a pair of pressure rollers capable of continuously pressing the heating and softening sealing margin. The center seal device according to any one.

According to the means 8, the seal margin is heated and softened by the heating means of the sealing means, and the heat-softened seal margin is continuously pressed by the pair of pressure rollers to form a seal. Is given. Therefore, continuous center sealing can be stably performed.

Means 9. At least the seal margin and the works corresponding to both sides thereof have a surface shape, and the pressing member is conveyed along or substantially along the surface shape of the work corresponding to the packaging members on both sides of the seal margin. 9. The center seal device according to any one of means 1 to 8, which has a plate-like shape.

According to the means 9, at least the seal margin and the works corresponding to both sides thereof have a surface shape, and the packaging members on both sides of the seal allowance are conveyed along or substantially along the surface shape of the corresponding work. Since the pressing member has a plate shape as described above, the tightness can be adjusted more easily.

Means 10. The pressing member is supported and fixed by a fixing tool with respect to the supporting means in a fixed state,
The means 1 is characterized in that the position of the pressing member can be adjusted by releasing the fixed state by the fixing tool.
10. The center seal device according to any one of 9 to 9.

According to the means 10, the position of the pressing member is adjusted by releasing the fixed state by the fixing tool. The width of the gap can be adjusted by adjusting the position. Therefore, tightness can be adjusted without providing a complicated mechanism or control.

Means 11. The pressing member is supported and fixed to a movable supporting means, and the position of the pressing member can be adjusted by controlling the movement of the supporting means. The center seal device according to claim 1.

According to the means 11, the position of the pressing member is adjusted by controlling the movement of the supporting means. The width of the gap can be adjusted by adjusting the position. Therefore, the tightness can be easily adjusted without depending on manual work.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION The present embodiment will be described below.

First, a product obtained by passing through the center seal device according to this embodiment will be described.

As shown in FIGS. 2A and 2B, the product 2
0 is a work (in the present embodiment, a plurality of stacked PTPs
The sheet 22 is packaged and sealed with a packaging member 24 made of a thermoplastic resin film. That is, the wrapping member 24 seals (center seals) the seal margin 27 formed by wrapping the periphery of the work 22 in a tubular shape and overlapping both side edges.
In addition, the work 22 is sealed by sealing the front and rear ends (end seal). In addition,
The seal margin 27 is a portion with a mesh pattern in the figure.

The sealing margin 27 is located substantially corresponding to the center of the upper surface of the work 22 in the width direction. The seal margin 27 is sealed by the center seal device 10 (see FIG. 1, etc.) according to the present embodiment. Also,
Portions corresponding to the front end portion and the rear end portion of the product 20 are sealed by an end seal device (not shown) provided on the downstream side of the center seal device, and the product 20 is obtained by cutting at the same time as the sealing. It is like this. The description of the end seal device will be omitted here.

Next, the structure of the center seal device 10 in this embodiment will be described. FIG. 1 is a side view schematically showing the center seal device 10, and FIG. 3 is a plan view thereof. As shown in these drawings, the center seal device 10 is provided as one of the packaging machines including various devices, and a bag-making device is provided on the upstream side (left side in the drawing) of the packaging machine and a downstream side thereof. End seal devices are provided on the right side of the drawing.

The center seal device 10 includes a packaging member 24.
A conveyor 30 for transporting the work 22 is also provided. The conveyor 30 has the work 2 on the packaging member 24.
In the state where 2 is placed, the work 22 and the like are moved at a constant speed from the upstream side to the downstream side, and the work 22 and the like are conveyed to the end seal device. The work 22 is the packaging member 2
4 are placed at a predetermined interval. Also, the work 22
When the packaging member 24 is guided to the center seal device 10, the packaging member 24 is wound around the work 22 in a tubular shape, and both side edges of the packaging member 24 are located on the upper surface side of the work 22. They are being transported in the state.

Above the conveyor 30, various members forming the main part of the center seal device 10 are provided. That is, the upstream feed roller 40, the heat block 50, and the center seal roller 6 are arranged in this order from the upstream side.
0, the downstream side feed rollers 70 are supported in pairs.

The upstream side feed roller 40 is the packaging member 2
4. Put both sides of 4 and put them on top of each other, and seal them.
Is formed and sent to the downstream side. The upstream side feed roller 40 rotates in the feeding direction of the sealing margin 27 while contacting each other. The heat block 50 installed on the downstream side of the upstream feed roller 40 is for heating and softening the sealing margin 27. That is, the heat blocks 50 are arranged so as to face each other with the sealing margin 27 interposed therebetween, and the sealing margin 27 passes between the two heat blocks 50 in a non-contact state, whereby the sealing margin 27 is It is designed to be heated to a temperature above the glass transition point and below the melting point.

Further, the center seal roller 60
Is provided immediately downstream of the heat block 50, and is for pressurizing the seal margins 27 in a softened state by heating the heat block 50 so as to weld and seal each other. In addition, the downstream feed roller 70 is for feeding the welded seal margin 27 further downstream, and rotates while contacting each other. Although the center seal device 10 of the present embodiment is configured to include the upstream side feed roller 40 and the downstream side feed roller 70, at least one of these may be omitted. It may be installed outside.

Now, these various members 40, 50, 60,
Immediately below 70, a pair of plate-like pressing members 80 are provided to support means 8
It is provided for 5. A gap portion 82 is formed between the pressing members 80. That is, the pressing member 80
Are provided so as to face each other with the gap 82 interposed therebetween. In addition, of the pressing members 80, the upstream end 84
Has a notch shape so that the gap 82 opens in a tapered shape. As a result, the sealing margin 27 is smoothly guided to the clearance 82 and the sealing margin 27 is
The load at the time of touching the pressing member 80 is reduced.

Further, the pressing member 80 according to the present embodiment.
Are movable and adjustable in the width direction. That is, a long hole (not shown) is formed in each holding member 80, and in the state where the long hole is aligned with the screw hole formed in the supporting means 85, a screw (not shown) is tightened to be fixed. ing. Therefore, by loosening the screw, the pressing member 80 can slide by the length of the long hole, and the position can be adjusted. Then, in the present embodiment, the width of the gap portion 82 can be changed as appropriate by adjusting the position of the pressing member 80 in the width direction.

Next, the procedure and effect of applying the center seal using the center seal device 10 will be described.

As described above, the work 22 and the packaging member 24 are transferred from the bag making device on the upstream side to the center seal device 10.
It is conveyed so as to be placed on the conveyor 30 of. At this time, for example, as shown in FIG. 4A, the periphery of the work 22 is wound in a tubular shape by the packaging member 24, and both side edges thereof are guided in a state of protruding upward from the upper surface of the work 22. The work 22 and the packaging member 24 guided by the center seal device 10 are basically the conveyor 3
It is transported to the downstream side by 0.

At the upstream portion of the center seal device 10, both side edge portions of the packaging member 24 are guided from the upstream end portion 84 to the gap portion 82. Then, when the both side edge portions are guided to the gap portion 82, first, they are nipped by the pair of upstream side feed rollers 40 and fed to the downstream side by the rotation thereof. At this time, both edge side portions are overlapped with each other to form the seal margin 27 (see FIG. 4B).

Next, the sealing margin 27 is guided to the pair of heat blocks 50, and the heat blocks 50 are heated.
Pass through. At this time, the seal margin 27 is heated,
Will be softened. Subsequently, the seal margin 27 is guided to the pair of center seal rollers 60, and is sandwiched by the rollers 60 to receive a pressing force. Then, by this pressurization, the sealing margin 27 is pressure-bonded and welded, so that sealing is performed.

After that, the sealing margin 27 is guided to the downstream side feed roller 70. And seal 27
Is fed to the downstream side while being sandwiched by the pair of downstream feeding rollers 70. After that, the packaging member 24 and the like having the center seal applied thereto is conveyed to the end seal device on the downstream side of the center seal device 10.

Now, in such a center seal,
The width of the gap 82 can be adjusted by adjusting the position of the pressing member 80. In the present embodiment, FIG.
As shown in FIG. 7, by making this width relatively narrow, the contact resistance with respect to the holding member 80 near the rising portion (corner portion) of the packaging member 24 becomes relatively large. Therefore, the force of pulling up both side edges of the packaging member 24 is relatively small, and the area of the sealing margin 27 is small. As a result, the degree to which the packaging member 24 tightens the work 22, that is, the so-called tightness is loose. on the other hand,
By making the width relatively wide, as shown in FIG.
The contact resistance with respect to the pressing member 80 near the rising portion (corner portion) of the packaging member 24 becomes relatively small. For this reason, the force of pulling up both side edges of the packaging member 24 is relatively large, the area of the sealing margin 27 becomes large, and the tightness becomes tight.

In order to confirm the above operation, the length (tightness) of the seal margin 27 of the obtained product 20 was measured when the width of the gap 82 was changed and the center seal was applied. The result is shown in FIG. As shown in the figure, when the width of the gap 82 is narrow, the sealing margin 27
It was confirmed that the length (area) of the sealing margin 27 was smaller, and conversely, the wider the width, the larger the length (area) of the sealing margin 27. As described above, according to the present embodiment, the tightness can be adjusted according to various needs by appropriately adjusting the width of the gap 27.

The present invention is not limited to the contents described in the above embodiment, but may be implemented as follows, for example.

(A) In the above embodiment, the sealing margin 2
Although the work 7 is formed on the upper surface side of the work 22, it may be formed on the lower surface side or the side surface side. In this case, it is necessary to appropriately change the positions of the sealing means, the pressing member, etc. depending on the position where the seal margin is formed.

(B) Although not particularly mentioned in the above embodiment, the installation angles of the upstream feed roller 40, the center seal roller 60, and the downstream feed roller 70 may be appropriately changed. For example, by arranging the upstream side feed roller 40 so as to be inclined slightly to the upstream side, stress is applied to the sealing margin 27 in the direction in which the packaging member 24 is tightened. When there is a need for tightness, the tightness can be adjusted together with the width adjustment of the gap 82 of the pressing member 80.

(C) The material forming the packaging member 24 is not particularly limited as long as it can seal (for example, heat weld) at least the sealing margin, and the entire material is necessarily composed of a thermoplastic resin. You don't have to.
Therefore, for example, an aluminum laminate film or the like can be used as the packaging member, or a material in which only the sealing surface is heat-weldable can be used as the packaging member. Also, regarding the type of work 22, P
The material is not limited to the TP sheet, and can be embodied in various foods, electronic parts, and the like.

(D) As the heating means, instead of the non-contact type heat block 50, a contact type one may be adopted, or another heat blower or the like may be used.
In addition, not only heating the entire sealing margin 27,
Of the sealing margins 27, those which heat only the sealing surface sides facing each other may be used. Further, in some cases, the heating means may be omitted.

(E) Further, as the center seal roller 60, a pressure roller (heat seal roller) having a heating means may be used. In this case, the heat block 50 can be omitted, and the entire apparatus can be made compact.

(F) In the above embodiment, the pressing member 80
Is provided over substantially the entire length of the center seal device 10 in the longitudinal direction, but may be provided at least between the upstream feed roller 40 and the center seal roller 60.

(G) In the above embodiment, the plate-shaped pressing member 80 is used, but the plate-shaped pressing member 80 is not necessarily limited to the plate-shaped member, and may be, for example, a rod-shaped member.

(H) In the above embodiment, the position of the pressing member 80 can be adjusted by loosening the screw as the fixture, but the position may be adjusted based on dial operation or lever operation. Alternatively, an actuator for activating the supporting means may be separately provided, and the position of the supporting means, and by extension, the holding member 80 may be adjusted based on drive control of the actuator. In this case, it is not necessary to rely on human hands, and moreover, automatic adjustment is possible according to the occasional needs.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a center seal device according to an embodiment.

2A and 2B are views showing a product obtained through the center seal device, in which FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is a plan view schematically showing a center seal device.

FIG. 4 is a schematic diagram illustrating a relationship between a packaging member and a pressing member, FIG. 4A is a diagram illustrating an upstream end portion,
(B) is a figure which shows the downstream.

5A and 5B are schematic diagrams illustrating the relationship between the packaging member and the pressing member, FIG. 5A is a diagram showing the operation when the width of the gap is relatively narrow, and FIG. It is a figure which shows the effect | action in the case of comparatively wide.

FIG. 6 is a diagram for confirming the operation of the embodiment, and is a graph showing the relationship of tightness with respect to the width of the gap portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Center sealing device, 20 ... Product, 22 ... Packaging member, 24 ... Work, 27 ... Sealing margin, 30 ... Conveyor, 40 ... Upstream side feed roller which comprises a feeding means, 50
... A heat block that constitutes heating means and sealing means,
Reference numeral 60 denotes a pressure roller and a center seal roller that constitutes a sealing means, 70 ... a downstream side feed roller that constitutes a feeding means, 80 ... a pressing member, 82 ... a gap portion, 85 ... support means.

Claims (11)

[Claims] 1. A center seal device capable of sealing a sealing margin in the state where a sealing margin is formed by overlapping both side edges of a sheet-shaped packaging member conveyed while enclosing a work, In order to convey the packaging members on both sides of the seal margin along or substantially along the corresponding work, a pressing member disposed with a gap is provided on both sides of the seal margin, and Center seal device with adjustable width. 2. A conveyor which can convey a packaging member and a work in a state where works are arranged at predetermined intervals on a sheet-like packaging member, and both side edges of the packaging member which is conveyed in a state where the work is wrapped. In a center seal device provided with a seal means capable of sealing by at least pressurizing a seal margin formed by overlapping one another, the packaging members on both sides of the seal margin, along or substantially along the corresponding work. A center seal device characterized in that a pressing member is provided on both sides of the seal margin so as to be conveyed along the gap, and a width of the gap is adjustable. 3. A conveyor capable of transporting the packaging member and the workpiece in a state where the workpiece is lined up at a predetermined interval on a sheet-shaped packaging member, and both side edges of the packaging member that is transported in the state where the workpiece is wrapped. In a state in which a sealing margin is formed by overlapping each other, a feeding means for feeding the sealing margin to the downstream side at the same speed as the moving speed of the conveyor, and a sealing means capable of sealing by at least pressurizing the sealing margin. In the center seal device including the above, the wrapping members on both sides of the seal allowance are arranged so as to be conveyed along or substantially along the corresponding work, with the gaps provided on both sides of the seal allowance. A center seal device, wherein a member is provided and the width of the gap is adjustable. 4. The center seal device according to claim 3, wherein the feeding means is provided at least on the upstream side of the sealing means. 5. The center seal device according to claim 3, wherein the feeding means is provided on the upstream side and the downstream side of the sealing means. 6. The pressing member according to claim 4, wherein the pressing member extends along the feeding direction of the sealing margin at least from the upstream feeding device to the sealing device. Center seal device. 7. The feeding means is configured not only to feed the sealing margin, but also to apply a stress in a direction of tightening the packaging member to the sealing margin. The center seal device according to any one. 8. The sealing means comprises heating means for heating and softening the sealing margin, and a pair of pressure rollers capable of continuously pressing the heating and softening sealing margin. The center seal device according to any one of claims 2 to 7. 9. At least the seal margin and the works corresponding to both sides thereof have a surface shape, and the pressing member has the packaging members on both sides of the seal margin along the surface shape of the corresponding work. Alternatively, the center seal device according to any one of claims 1 to 8, wherein the center seal device has a plate shape so that the center seal device is conveyed substantially along the same. 10. The pressing member is supported and fixed to a supporting means in a fixed state by a fixing tool, and the position of the pressing member can be adjusted by releasing the fixing state by the fixing tool. The center seal device according to any one of claims 1 to 9, wherein 11. The holding member is supported and fixed to a movable supporting means, and the position of the holding member can be adjusted by controlling the movement of the supporting means. Item 10. The center seal device according to any one of items 1 to 9.