JP2000203527A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device for securely sticking an adhesive tape in a good manner without floating even in the case the center of a sticking face of carton is recessed. SOLUTION: In a sealing device in which a sticking roller 25 and a pressing roller 26 are provided to move in and out respectively on a carrying line of a carton W and both rollers 25 and 26 are linked and connected with each other by a connecting link 28 so that the protruded and energized pressing roller 26 is retracted from the carrying line linked with the retraction movement of the sticking roller 25 generated by the contact with the carton W, a slot 32 providing a room in the given range for a linking system between the sticking roller 25 and the pressing roller 26 is formed, and the sticking roller 25 can be moved freely to the carrying line side in the range of the slot 32 in the state of retraction moving both rollers 25 and 26 from the carrying line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for sealing a carton for packing and conveying various articles with an adhesive tape.

[0002]

2. Description of the Related Art As one of conventional devices for sealing a carton, one disclosed in Japanese Patent Application Laid-Open No. 9-207243 is known. FIGS. 16 and 17 show the configuration of the adhesive tape attaching mechanism and the tape attaching process.

That is, the adhesive tape attaching mechanism includes an adhesive tape roll RT around which an adhesive tape T is wound, and an attaching unit 60. Support points P1 and P2 are provided at the front end, the rear end, and the middle of the unit frame 61, respectively.
, P3, the swing arms 62, 6
3, 64 are mounted. At the free ends of the front and rear swing arms 62 and 63, a sticking roller 65 and a pressing roller 66 are respectively provided so as to freely rotate, and at the free end of the middle swing arm 64, the cutting edge is downward. The tape cutter 67 is mounted.

The front and rear swing arms 62 and 63 are interlocked and linked by a link 68, and move up and down in synchronism by swinging in opposite directions. Each of the two swing arms 62 and 63 is directed downward by a spring 69 extending between the swing arm 63 of the pressing roller 66 and the unit frame 61 so as to protrude into the transport path A of the carton W as a workpiece to be pasted. It is urged to swing. The swing arm 64 is also urged to swing downward by a spring 70 stretched over the unit frame 61.

[0005] Adhesive tape sticking by the adhesive tape sticking mechanism configured as described above is performed as follows.

(1) As shown in FIG.
In the standby state where does not arrive, the attaching roller 65, the pressing roller 66, and the tape cutter 67 are each at a position where they have entered the transport path A of the carton W. At this time, the front end portion ta of the adhesive tape T fed out from the adhesive tape roll TR is held on the front surface of the attaching roller 65.

(2) When the carton W comes into contact with the sticking roller 65, the sticking roller 65 retreats upward against the spring 69 while the tip part ta of the adhesive tape T is stuck on the front surface of the carton W. With this, the pressing roller 66 linked to the attaching roller 65 also moves up and down.

(3) When the carton W moves further forward,
As shown in FIG. 17A, the attaching roller 65 rides on the carton W and attaches the adhesive tape T along the butted edges of the left and right flaps. At this time, the pressing roller 66 that has moved up and down is also on the moving path of the carton W. Further, the swing arm 64 is brought into contact with the carton W by the contact.
Is pushed up against the spring, and the tape cutter 67 is retracted above the adhesive tape T.

(4) Even if the carton W further advances and the sticking roller 65 comes off the rear end of the carton W, the sticking roller 65 is held at the raised position while the pressing roller 66 is still positioned on the carton W. The adhesive tape T protruding from the rear end of the carton W is in a tension state. here,
When the contact member 71 provided at the free end of the swing arm 64 comes off the rear end of the carton W, the tape cutter 67 is lowered by the spring 70, and cuts the adhesive tape T that has been tensioned as described above. .

(5) As the carton W further advances, the pressing roller 66 which is urged downward moves relative to the carton W while being pressed from the upper surface to the rear surface as shown in FIG. And the rear end tb of the adhesive tape T
Is wound around the rear surface of the carton W and affixed, and the carton W with the completed tape sealing is carried out from the end of the transport path A.

[0011]

However, in the above-mentioned conventional apparatus, the front attaching roller and the rear pressing roller are linked to each other so that the retracting operation with respect to each transport path is completely synchronized. The following problems may occur. That is, as shown in FIG. 16 (a), when the attaching roller 65 is attaching the adhesive tape T to the upper surface of the carton W, the central portion of the upper surface of the carton W is depressed as shown by a virtual line u in the figure. The pressing roller 6
6 cannot be moved downward because it is located in a place where no depression is present or a place where the depression is small, the attaching roller 65 also cannot move downward, and is in a state of being lifted out of the depression and attaching. Since the roller 65 and the pressing roller 66 are not urged by independent spring forces, the pressure-sensitive adhesive tape T may not be properly applied to the recessed portion. Especially, carton W with thin material
Is formed, and when the central portion of the attachment surface is likely to be recessed, the above problem becomes more remarkable.

The present invention has been made in view of such a situation, and a sealing device capable of securely adhering an adhesive tape even when the center of the adhering surface of a carton is depressed. The purpose is to provide.

[0013]

The present invention has the following configuration to achieve the above object.

According to the first aspect of the present invention, the sticking roller for guiding the adhesive tape is provided so as to be able to move back and forth with respect to the conveying path of the carton, and the sticking roller is conveyed to a position below the conveying path of the sticking roller. A pressing roller is provided which is capable of moving back and forth with respect to the path and is urged to protrude. The pressing roller is attached in conjunction with the application roller being moved backward from the conveying path by contact with a carton to be conveyed. A sealing device in which both rollers are interlocked and linked by a link so as to move backward against the force, and the adhesive tape guided by the application roller is applied to the application surface of the carton by a pressing roller and pressed against the application surface. A device,
Forming a predetermined range of flexibility in the link linking system between the pasting roller and the pressing roller, and in a state where both rollers are moved backward by contact with the carton, the pasting roller is moved toward the conveyance path within the range of the flexibility. It is characterized by being freely movable.

According to a second aspect of the present invention, in the sealing device according to the first aspect of the present invention, at least one end of the link is provided with a pin connecting hole as an elongated hole to provide the accommodation.

According to a third aspect of the present invention, there is provided the sealing device according to the first or second aspect of the present invention, wherein a limit of the protrusion of the pressing roller is limited, and when the pressing roller is at the limit, the pressing roller is attached. The biasing spring is set so as to be in a free state or a state close to the free state.

[0017]

According to the present invention, the following operations are performed.

According to the first aspect of the present invention, the carton abuts on the sticking roller and moves forward while moving it backward, so that the rear pressing roller linked to the sticking roller moves backward against the urging force. Then, the adhesive tape is attached. In a state in which both rollers have climbed onto the sticking surface of the carton, the position of the pressing roller is regulated by the sticking surface, whereas the sticking roller is independent of the transport path side by the flexibility of the link linking system, that is, It can be freely moved to the side where the carton is pasted. Therefore, even if the application surface on which the application roller operates is recessed from the application surface on which the pressing roller is operating, the application roller moves along the application surface regardless of the position of the application roller, and the adhesive tape is depressed. You can stick it on the sticking surface.

According to the second aspect of the present invention, by providing the pin linking hole of the link as an elongated hole, it is possible to obtain flexibility in which the sticking roller has a function of independently following the concave portion of the sticking surface. By setting the length of the long hole, the size of the slot can be changed to an arbitrary size.

According to the third aspect of the present invention, the carton abuts on the sticking roller and moves forward while moving the sticking roller backward, so that the rear pressing roller linked to the sticking roller is biased by the urging force given by the spring. When the pressing roller starts to retreat, the spring force is small or almost non-existent, so that the reaction force applied to the front surface of the carton from the sticking roller is sufficiently small.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a carton sealing device will be described below with reference to the drawings.

As shown in the overall side view of FIG. 1 and the perspective view of the main part of FIG. 2, this sealing device simultaneously transports a carton W as a workpiece to be pasted while simultaneously transporting the top and bottom surfaces thereof. Basically, a pair of right and left transfer mechanisms 2 are provided on a hand-movable machine base 1 and an adhesive tape attaching mechanism 3 is vertically arranged with a carton transfer path A interposed therebetween. , 4 are equipped.

The machine base 1 is hollowed out in plan view, and a number of conveying rollers 5 are horizontally arranged on the upper part thereof without a pair on the left and right. A carton W is mounted above these roller groups. Transport path A for mounting and transporting horizontally in the front-rear direction
Are formed. Before and after this transport path A,
The carry-in roller conveyor 6 and the carry-out roller conveyor 7 are connected.

Each of the left and right transport mechanisms 2 wraps a transport belt 8 that rotates about a vertical axis back and forth, and the motors M rotate in opposite directions so that the opposing surfaces of the transport belts 8 move backward. It is configured to be driven to rotate and to forcibly convey the carton W on the conveying roller 4 rearward while nipping the carton W between the right and left conveying belts 8. In addition, the two transfer mechanisms 2 are configured to be position-adjustable left and right so that the distance between the two can be adjusted in accordance with the width of the carton W.

The upper and lower adhesive tape applying mechanisms 3 and 4
An adhesive tape roll RT around which an adhesive tape T is wound and an attaching unit 10 are provided. The lower adhesive tape applying mechanism 4 is fixed in its operating position, while the upper adhesive tape applying mechanism 3 is supported via a support 11 so as to be adjustable up and down. The operation position of the upper adhesive tape applying mechanism 3 can be adjusted. In addition, a pair of left and right guides 12 for guiding the upper surface of the conveyed carton W and pressing the left and right flaps are provided below the upper adhesive tape applying mechanism 3.

As shown in FIG. 4, in each of the upper and lower adhesive tape applying mechanisms 3 and 4, a fulcrum 14 for freely supporting the adhesive tape roll RT is provided on the support frame 13 of the attaching unit 10 by a vertical guide groove. 15 is supported so as to be able to move up and down. Then, the upper adhesive tape attaching mechanism 3
The fulcrum portion 14 is supported by the vertical guide groove 15 so as to be freely movable so that the pressure-sensitive adhesive tape roll RT is biased downward by its own weight. On the other hand, the fulcrum part 14 is urged upward by a spring (not shown) and supported by the vertical guide groove 15 so that the adhesive tape roll RT in the lower adhesive tape sticking mechanism 4 is pulled upward and urged upward. I have.

Further, the lower adhesive tape attaching mechanism 4 includes:
The unit 1 is supported by the machine base 1 so as to be rotatable upward about a fulcrum x provided at the upper rear end of the attaching unit 10, and as shown in FIG. 3, the upper adhesive tape attaching mechanism 3 is retracted upward. With the space above the machine 1 wide open,
By rotating the entire lower adhesive tape applying mechanism 4 upward by about 90 ° through the space between the left and right idler rollers 5 groups, the adhesive tape roll RT in the lower adhesive tape applying mechanism 4 can be detached and replaced. Can be easily performed from a large space on the transport path A. At the fulcrum x, as shown in FIG. 4, a fulcrum pin 16 provided at a corner of the bonding unit 10 is provided with a hook-shaped fulcrum groove 17 provided on the machine base 1 side.
And the whole of the adhesive tape attaching mechanism 4 can be swung up and down around the fulcrum x and the fulcrum pin 16 is detached from the locking groove 17 so that the entire attaching unit 10 is detached from the machine base 1. It is also possible to perform a sealing process using only the upper adhesive tape attaching mechanism 3. Further, the adhesive tape attaching mechanism 4 that has been rotated downward and returned engages the engaging pin 18 provided on the attaching unit 10 into the engaging groove 19 formed on the machine base 1 side, and a predetermined attaching operation position. Is to be held.

The sticking unit 10 has the same configuration as that of the upper and lower adhesive tape sticking mechanisms 3 and 4 except that the operation posture is inverted up and down. Will be described.

As shown in FIG.
Fulcrum P1 at the front end, rear end, and middle
Arm 2 that can swing up and down around P2, P2 and P3
2, 23, 24 are mounted. Swing arm 2 before and after
At the free ends of 2 and 23, a sticking roller 25 and a pressing roller 26 are respectively provided so as to freely rotate. At the free end of the intermediate swing arm 24, a tape cutter 27 with the cutting edge directed downward is exchangeably mounted.

The front and rear swing arms 22 and 23 are interlocked and linked by a link 28, and move up and down synchronously by swinging in opposite directions. Each of the two swing arms 22 and 23 is urged downward by a spring 29 extending between the swing arm 23 of the pressing roller 26 and the unit frame 21 so as to protrude into the transport path A of the carton W. Have been. The lower swing limit of the swing arm 23 is restricted by the stopper 30 provided so as to be adjustable in position around the fulcrum P2.

The swing arm 22 has an adhesive tape roll RT
The adhesive tape T fed from the
A guide roller 31 for guiding the winding is provided, and the leading end portion ta of the adhesive tape T is guided and held on the front surface of the attaching roller 25 with its adhesive surface facing the upper side of the transport path A (to the right in FIG. 4). ing.

The rear end of the link 28 and the swing arm 23 are connected to a long hole 32 provided at the rear end of the link 28.
The pins are connected with the flexibility of using. In a state where the swing arm 23 is received and supported by the stopper 30 and the projection is limited, the spring 29 has a free length or a state close to the free length.

The swing arm 24 is also urged downward by a spring 33 extending over the unit frame 21. A contact member 34 attached to the free end portion of the swing arm 24 so as to be able to move back and forth is configured to interfere with the movement trajectory of the carton W. The lower swing limit of the swing arm 24 is restricted by the stopper 35.

Further, a suction nozzle 36 having a tapered shape communicating with a vacuum suction means (not shown) is provided at an intermediate position between the rear pressing roller 26 and the tape cutter 27 at a position where the adhesive tape is applied. I have.

Next, the operation of sticking the adhesive tape will be described.

(1) As shown in FIG. 4, in an initial state where the carton W does not reach, the attaching roller 25 supporting the adhesive tape T, the pressing roller 26, and the tape cutter 2
Reference numerals 7 stand by at positions where the cartons W enter the transport path A. The adhesive tape roll RT urged downward by its own weight is received and held by the stopper 37 provided on the unit frame 21, and is in a state separated from the attaching roller 25.

(2) When the carton W comes into contact with the application roller 25, the application roller 25 is retracted upward while the front end portion ta of the adhesive tape T is applied to the front of the carton W. In addition, the link 28 is pushed rearward with the upward swing of the attaching roller 25, and the pressing roller 26 at the rear is pressed.
Also rises and recedes.

In this case, in the standby state, the spring 29 has a free length or a state close to the free length.
In the initial state of sticking to the front of the carton, the pressing roller 26
No large spring force acts on the swing arm 23 from the spring 29, and the reaction force of the sticking roller 25 pressing the front surface of the carton W is not so large. Therefore, even when the carton W is thin and has low rigidity, the sticking roller 25 does not press the front surface of the carton W with an unreasonably large force to bend and deform.

(3) When the carton W moves further forward,
As shown in FIG. 5, the application roller 25 rides on the carton W and affixes the adhesive tape T along the butted edges of the left and right outer flaps. Further, the pressing roller 26 that has climbed onto the carton W is urged downward by a spring 29, and further presses the adhesive tape T applied by the applying roller 25 from above to the upper surface of the carton, and thus the sufficient pressure is applied. Pasting by pressing is performed.

The contact member 3 at the tip of the swing arm 24
4 comes into contact with the carton W so that the swing arm 24
Is pushed up against the spring 33 and the tape cutter 27 is
Is forcibly retracted above the adhesive tape T. In the tape sticking process on the upper surface of the carton W, as shown in FIG. 5, only the swing arm 22 of the sticking roller 25 is vertically It is free to swing. Therefore, as shown by the imaginary line u in FIG. 5, even if the upper surface of the carton W is bent and slightly recessed, the attaching roller 25 can freely follow the recessed surface and lift the adhesive tape T up. You can stick it without.

In the adhesive tape attaching process, the applied attaching roller 25 comes into contact with the downwardly directed outer peripheral surface of the adhesive tape roll RT, and the adhesive tape roll RT is lifted up to a state of floating from the stopper 37. As a result, the adhesive tape T that is fed out is peeled off at the contact point between the adhesive tape roll RT and the application roller 25, is directly wound around the application roller 25, and is guided to the application position. Further, the rotation of the application roller 25, which is rotated clockwise in FIG. 5 with the forward movement of the carton W, is directly transmitted to the outer peripheral surface of the adhesive tape roll RT. The adhesive tape T is fed out while being rotationally driven at the same peripheral speed as the speed.

(4) As shown in FIG. 6, even if the carton W further advances and the attaching roller 25 comes off the carton W, while the abutment member 34 is engaged with the carton W,
The application roller 25 is held up by the tension of the adhesive tape T. When the contact member 34 comes off the rear end of the carton W, the tape cutter 27 is lowered by the spring 33 to cut the adhesive tape T, and the bonding roller 25 is lowered to the original standby position. The tape cutting position can be adjusted by adjusting the projecting length of the contact member 34 of the swing arm 24.

(5) When the tape is cut, the lowering of the swing arm 24 is detected by a sensor (not shown), and the suction operation by the suction nozzle 35 is started. As shown in FIG. The pressing roller 26 approaches the rear end of the carton W in a state where the rear end portion tb is suction-held by the suction nozzle 35. In this case, since the suction nozzle 35 acts on a portion slightly behind the cutting edge, the rear end portion tb of the adhesive tape T drawn into the suction nozzle 35 as shown in FIG.
Is folded in such a manner that the front end side has the adhesive surface inside.

(6) In this state, as the carton W further advances further, the downwardly urged attaching roller 26 is moved to the rear end angle of the carton W as shown by the imaginary line in FIG. The lower part of the adhesive tape T is moved downward while being pressed against the rear surface of the carton W, and the rear end part tb of the adhesive tape T is wrapped around the rear surface of the carton W to be adhered. It is carried out from the end of the route A. In this case, as shown in FIG. 9, the folded portion tc formed at the front end of the rear end tb of the adhesive tape T is not attached to the carton W.
When you open the box, it becomes a fingerhold for peeling off the tape.

(7) As described above, once the operation of sticking the adhesive tape is completed, the operation returns to the initial state, and preparation for the next carton supply is performed. Since the lower tape applying mechanism 4 is located slightly above the transport path A than the upper tape applying mechanism 3, the same processing as described above is performed at a timing slightly earlier than the upper tape applying mechanism 3.

In performing the above-mentioned attaching operation,
The carton W carried into the transport path A may be slightly distorted in a plane due to a folding habit at the time of assembling, and the distortion correcting mechanism 40 for automatically correcting the distortion is provided by the transport mechanism. 2 at its front end, the configuration of which is shown in FIGS.

That is, in each of the left and right transport mechanisms 2,
A contact restraining member 42 made of a thin resin sheet is attached to the front end of a cover case 41 arranged to cover the transport belt 8 from the outside and the upper side so as to be able to swing about a vertical axis fulcrum y. As shown in FIG. 13, the contact restraining member 42 on the side (upper side in FIG. 13) that is distorted forward in the transport direction of the carton W is swung out toward the transport path A, and the start end of the transport belt 8 on this side is contact restrained. While being covered and concealed by the member 42, the other contact restraint member 42 is folded back so as to be out of the transport path A.

By doing so, the right and left transport mechanisms 2
In the case of FIG. 13, the right side surface sa distorted forward in the conveyance direction is in a state where the conveyance force of the conveyance belt 8 is not received by the contact restraint member 42 in FIG. On the other hand, the left side surface sb immediately receives the conveying force of the conveying belt 8, the carton W is sent while receiving the conveying force only from the left side surface sb, and the right side sa of the carton W is contacted and suppressed on the right side. It moves while sliding on the surface of the contact restraint member 42. As a result, the left side surface sb subjected to the forced conveying force precedes the right side surface sa restrained by the conveyance, and the initial distortion is gradually corrected.

When the initial distortion is corrected and the front of the carton is perpendicular to the transport direction, the width of the front end of the carton in the direction perpendicular to the transport direction is maximized, and the transport force from both transport belts 8 is reduced. Receive the most. Then, the side of the carton preceding this state tends to separate from the conveyor belt 8 and the conveying force is weakened. Therefore, after the front of the carton becomes perpendicular to the transport direction, the left side surface sb that has been subjected to the forced transport force does not distort in advance in the reverse direction, and the distortion disappears as shown in FIG. In this state, the cartons W receive uniform conveying force from the left and right, and are conveyed to the adhesive tape sticking processing site in a normal posture.

In this case, since the direction of distortion of the carton W is determined by the assembling specifications of the box, if the same type of carton W is continuously supplied, the left and right contact restraining members 42 will It is sufficient that only one of the leading side is set to the functional posture.

The present invention can be carried out in the following modes in addition to the above embodiment.

(1) The holes at the pin connection points at both ends of the link 28 may be formed as long holes to disperse the flexibility.

(2) By reversing the configuration of the pin / long hole connection point,
Swing arm 23 (or 23 and 22)
It can also be formed on the side.

(3) The long hole interchange is not limited to the pin connection point of the link 28. For example, the link may be configured to be slidable and extendable, and the amount of slide may be limited to a certain range. Even in this case, the same function as the above embodiment can be exhibited.

(4) If an adjustment bolt is provided at the end of the long hole 32 so that the size of the flexibility can be adjusted, the flexibility can be reduced or the flexibility can be eliminated. Becomes

(5) A long hole and a round hole are formed in advance as holes for pin connection, and by selecting these and connecting the pins, a flexible use state and a non-flexible use state can be selected. You can also do so.

[0057]

As is clear from the above description, according to the present invention, the following effects can be expected.

That is, according to the sealing device of the first aspect of the present invention, when both the attaching roller and the pressing roller ride on the attaching surface of the carton, the pressing roller is positioned by the contact with the carton. On the other hand, since the pasting roller can be protruded and moved toward the transport path side through the accommodation, even if the center of the upper surface of the carton is depressed, the pasting roller can be moved along the depression without being limited to the pressing roller. The tape can be moved, and the adhesive tape can be stuck to the depression without lifting.

According to the sealing device of the second aspect of the present invention, desired flexibility can be easily and inexpensively formed by utilizing a structure required for link linking means for interlockingly linking the attaching roller and the pressing roller. Can easily be carried out.

According to the third aspect of the present invention, when the sticking roller is pushed and moved on the front of the carton at the start of sticking, the roller contact force applied to the front of the carton can be reduced, and the thin and easily deformable carton is processed. Even at this time, it has become possible to carry out appropriate pasting without deforming the front surface.

[Brief description of the drawings]

FIG. 1 is a side view of a carton sealing device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a main part thereof.

FIG. 3 is a side view of an adhesive tape roll replacement state.

FIG. 4 is a side view showing the adhesive tape attaching mechanism in a standby state.

FIG. 5 is a side view showing an adhesive tape attaching mechanism in an attaching step.

FIG. 6 is a side view showing an adhesive tape attaching mechanism in an attaching step.

FIG. 7 is a side view showing the pressure-sensitive adhesive tape sticking mechanism in a state immediately before the end of the sticking.

FIG. 8 is a vertical sectional side view showing an operation state of a suction nozzle.

FIG. 9 is an enlarged side view of a rear end side portion of the attached adhesive tape.

FIG. 10 is an overall perspective view of the carton after sealing is completed.

FIG. 11 is a perspective view of a distortion correcting mechanism of the carton.

FIG. 12 is an exploded perspective view of a distortion correction mechanism.

FIG. 13 is a plan view showing an operation state of the distortion correction mechanism.

FIG. 14 is a plan view showing a transport state of a carton whose distortion has been corrected.

FIG. 15 is a side view showing a standby state of the conventional adhesive tape attaching mechanism.

FIG. 16 is a side view showing a sticking process of a conventional adhesive tape sticking mechanism.

[Explanation of symbols]

 25 Adhering roller 26 Pressing roller 28 Linkage link 32 Slot (flexible) A Transport path T Adhesive tape RT Adhesive tape roll

Claims (3)

[Claims] A sticking roller for guiding an adhesive tape is provided so as to be able to move back and forth with respect to a transport path of a carton. A biased pressing roller is provided, and the pressing roller is moved backward against the urging force in conjunction with being moved backward from the conveyance path by contact with the carton to which the application roller is conveyed. In addition, the two rollers are linked by an interlocking link, a sealing device configured to press the adhesive tape applied to the application surface of the carton and guided by the application roller to the application surface by a pressing roller, wherein the application roller and A predetermined range of flexibility is formed in the link linking system with the pressing roller, and in a state where both rollers are moved backward by contact with the carton, the sticking roller is moved. There sealing apparatus characterized by are configured to be freely moved in the transport path side within range of the flexibility. 2. The sealing device according to claim 1, wherein a hole for connecting a pin at at least one end of the link is formed as an elongated hole to form the accommodation. 3. The sealing device according to claim 1, wherein a limit of a protrusion of the pressing roller is limited, and a spring for urging the pressing roller to project when the pressing roller is at the limit of protrusion is in a free state. Or a sealing device set to be in a state close to this.