JP2003137207A - Vertical bag making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of a packaging machine by operating seal jaws stably at a high speed while the number of components is suppressed. SOLUTION: The box-motion-type vertical bag making and packaging machine 1 includes a pair of seal jaws 11a and 11b which horizontally move to come into contact with each other thereby laterally sealing a tubular wrapping material, a crank 21 and links 22a and 22b which horizontally move the seal jaws 11a and 11b, a support member 13 for supporting the seal jaws 11a and 11b, the crank 21, and the links 22a and 22b, a pair of right and left guide rods 45 and 45 for guiding vertical movement of the support member 13, a spline shaft 20 on a side of a packaging machine body 100 for rotating the crank 21, and a servo motor on a side of the packaging machine body 100 for rotating the shaft 20. The spline shaft 20 and the guide rods 45 and 45 stand in parallel with one another and vertically pass through the support member 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical bag-making packaging machine in which a tubular packaging material extends vertically. Specifically, in a vertical bag-making packaging machine in which a horizontal sealing jaw moves in a box motion in which the vertical movement and the horizontal movement are repeated, the vertical movement of the sealing jaw is accelerated, and thus a technical field that contributes to improving the capacity of the packaging machine. Belong to.

[0002]

2. Description of the Related Art A vertical bag-making and packaging machine used for the production of bag-like products such as snack foods bends a strip-shaped packaging material around a tube into which an article is inserted from above and bends it into a vertically long tubular shape.
While filling the tubular packaging material with an article, the tubular packaging material is vertically and horizontally sealed to form a bag. In order to improve the capacity of the packaging machine, the tubular packaging material is horizontally sealed. There is known a model in which the inside is continuously conveyed, and a pair of horizontal sealing jaws is moved in a box motion accordingly. That is, the seal jaw draws a quadrilateral locus in a side view, which is a combination of a vertical movement along the transport direction of the packaging material and a horizontal movement that touches or separates from each other. The seal jaws sandwich the packaging material between them when they are in contact with each other, and laterally seal the packaging material by heat and pressure.

In such a model, the horizontal seal jaw is
Generally, it is supported by a supporting member such as a frame or a rod so as to be movable in the horizontal direction. A vertical moving mechanism and a horizontal moving mechanism for the seal jaw are separately provided, the vertical moving mechanism vertically moves the seal jaw together with the supporting member, and the horizontal moving mechanism supports the seal jaws so as to contact or separate from each other. Move horizontally within the member.

In that case, for example, Japanese Patent Laid-Open No. 2000-255.
In the apparatus disclosed in Japanese Laid-Open Patent Publication No. 506, Japanese Patent Laid-Open No. 55-64014, US Pat. No. 4,265,074, etc., not only the horizontal moving mechanism but also its driving source is provided in the supporting member. Therefore, the weight of the object vertically moved by the vertically moving mechanism is increased, and the load on the vertically moving mechanism and its drive source is increased. As a result, the durability of the vertical movement mechanism and the drive source is reduced, and the vertical movement of the seal jaws is impeded. Also, for example, when using highly accurate equipment such as a servo motor as the drive source for the horizontal movement mechanism, it is necessary to install a vibration isolation device, etc. so that the disturbance caused by vertical movement is not input to the equipment. Weight increases more and more, and speeding up is hindered.

On the other hand, in the device disclosed in Japanese Utility Model Publication No. 58-45202, only the horizontal moving mechanism is provided on the supporting member, and the drive source thereof is provided on the main body side of the packaging machine. Therefore, the weight of the object to be vertically moved by the vertically moving mechanism is reduced, and the vertical movement of the seal jaw is not hindered. Further, since vibration transmission to the drive source due to the vertical movement is also eliminated, it is possible to use highly accurate equipment such as a servo motor without installing a vibration isolation device or the like.

In this case, the transmission of the driving force from the drive source on the main body side to the horizontal moving mechanism which moves vertically extends in the vertical direction,
Achieved using a spline shaft rotated by the drive source.
The vertical movement mechanism vertically moves the seal jaws and the support member along the spline shaft. The horizontal movement mechanism horizontally moves the seal jaws by rotating the spline shaft. That is, the horizontal movement mechanism has a gear train including a gear that rotates integrally with the spline shaft, and the jaws are pressed against and brought into contact with each other by the cam that transmits the rotation via the gear train.

Also, in US Pat. No. 4,845,926, a drive source (cylinder) is provided on the main body side, and a pair of seal jaws are contacted with or separated from each other by a crank and a link rotated by the drive source. The packaging device is described. However, this device is a model that does not move the seal jaw up and down or does not perform box motion in the first place. Therefore, there is no problem or problem that the support member of the seal jaw is lightened and the up and down movement of the jaw is accelerated. It is a thing.

[0008]

In order to speed up the vertical movement of the seal jaws, it is important to reduce the weight of the object to be moved vertically and to stabilize and smooth the movement. . For that purpose, for example, a vertically extending guide rod may be provided upright and the vertical movement of the support member may be guided by the guide rod. On the other hand, in order to prevent the device from becoming complicated and soaring. There is a demand to suppress the installation of such members as much as possible.

In this regard, the above-mentioned Japanese Patent Laid-Open No. 2000-25550.
The device disclosed in Japanese Patent Publication No. 6 is provided with a pair of left and right guide rods for smoothly raising and lowering the support member of the seal jaw. However, since there are two guide rods and therefore two-point support, there is an undeniable possibility that the support member tilts and twists when moving up and down. Further, in the devices disclosed in Japanese Patent Laid-Open No. 55-64014 and U.S. Pat. No. 4,265,074, the support member of the seal jaw is cantilevered. Therefore, the structure is unsuitable for vertically moving the support member at a high speed in a stable posture without fluttering.

Further, in the device disclosed in Japanese Utility Model Publication No. 58-45202, as described above, a pair of left and right spline shafts for transmitting the driving force to the horizontal moving mechanism are provided, and the supporting members are provided on these two spline shafts. Move up and down along. However, since it is still two-point support, the support member tends to tilt,
Therefore, it is not easy to move the support member up and down at a high speed in a stable posture.

Moreover, in this case, since the spline shaft is in charge of all of the transmission of the driving force to the horizontal movement mechanism and the guide of the vertical movement of the support member, the load is concentrated on the spline shaft and the shaft is thickened. It is necessary to take measures to improve rigidity, such as Furthermore, if the support member is tilted and twisted during the rotation of the spline shaft, that is, while the driving force is being transmitted to the horizontal movement mechanism, the engaging portion between the support member and the spline shaft will be forced, and the horizontal movement mechanism will be moved. There is also a problem that the transmission of the driving force to the vehicle cannot be performed smoothly. Further, it is not preferable from the standpoint of structure and cost to newly install a guide rod dedicated to guiding in order to avoid the two-point support that causes such various problems.

The present invention has been made in view of the above circumstances, and in a vertical bag-making packaging machine in which the horizontal sealing jaws perform box motion, a supporting member for the horizontal sealing jaws is provided without newly installing an extra member. It is an object of the present invention to achieve both weight reduction and stabilization of the support thereof, thereby increasing the vertical movement of the horizontal sealing jaw and increasing the capacity of the packaging machine.

[0013]

That is, the invention according to claim 1 is to form a vertically extending tubular packaging material, to fill the tubular packaging material with an article, and to form the tubular packaging material vertically and horizontally. A vertical bag-making packaging machine for sealing, wherein a pair of horizontal sealing members for horizontally sealing the tubular packaging material by moving and contacting in the horizontal direction, and the pair of horizontal sealing members in the horizontal direction. A horizontal movement mechanism for moving the horizontal movement mechanism, a support member for supporting the horizontal movement mechanism and the lateral seal member, a vertical movement mechanism for vertically moving the support member, and a vertical movement of the support member. A rotary shaft provided with a pair of guide rods and provided on the packaging machine main body side to drive the horizontal movement mechanism by engaging with the horizontal movement mechanism, and the rotation shaft provided on the packaging machine main body side as well. And a drive source for rotating the Shaft is characterized in that through said support member in parallel with the pair of guide rods vertically.

According to the present invention, the pair of horizontal seal members are vertically moved together with the support member by the vertical movement mechanism, and horizontally moved by the horizontal movement mechanism so as to be in contact with or separated from each other. As a result, the horizontal seal member executes the box motion. In that case, in particular, the horizontal movement of the horizontal seal member is achieved by the drive source rotating the rotating shaft and the rotating shaft driving the horizontal moving mechanism. Since the and are provided on the main body side of the packaging machine, the weight of the supporting member side for vertically moving the vertical moving mechanism is reduced, which contributes to speeding up and down movement of the supporting member and the seal member.

In addition, for stabilizing the vertical movement of the support member, a pair of guide rods for guiding the vertical movement of the support member are provided, and the horizontal movement mechanism is provided for driving. Since the rotating shaft vertically penetrates the support member in parallel with the pair of guide rods and functions as a guide rod, common members are used, the number of parts is reduced, and the structure is simplified without newly installing extra members. While achieving the above, the support member can be supported at three points, the posture of the support member can be stabilized, and the vertical movement can be facilitated.
Therefore, high-speed operation of the support member and the seal member up and down is ensured.

Moreover, the load for guiding the vertical movement of the support member is distributed between the rotary shaft and the guide rod and is not concentrated only on the rotary shaft. Therefore, the problem that the load of the driving force transmission to the horizontal movement mechanism and the load of the guide of the support member are concentrated on this rotary shaft and it is easy to overload, or that the rigidity of this rotary shaft must be improved is solved. It

Next, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the pair of guide rods and the rotary shaft are not aligned in a line.

According to the present invention, since the support points by the pair of guide rods and the rotary shaft are not aligned in a straight line, the support member can be supported on the surface, the support member does not tilt, and the support member does not tilt. Stabilization of the posture will become even more reliable.

Next, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the number of the rotating shafts is one, and the horizontal moving mechanism is the rotation of the one rotating shaft. In response to this, the pair of horizontal seal members are simultaneously moved in opposite directions by the crank and the link.

According to the present invention, since only one rotary shaft is used to drive the pair of lateral seal members,
Also in this respect, it is possible to use common members, reduce the number of parts, and simplify the structure. Further, the operations of the seal members are easily synchronized with each other, and a smooth contacting operation or separating operation is realized. In that case, since the pair of horizontal seal members simultaneously move in opposite directions and come into contact with or separate from each other, the movement distance of one seal member can be short, and this also contributes to high-speed operation of the packaging machine.

Next, in the invention described in claim 4, in the invention described in claim 3, the link and each lateral seal member are connected at a central portion in the longitudinal direction of the lateral seal member. It is characterized by

For example, in the device disclosed in Japanese Utility Model Publication No. 58-45202, the cams for pressing the sealing jaws are arranged at the left and right ends of the horizontally long sealing jaws, so that the center of the jaws in the longitudinal direction thereof. The pressing force does not act directly on the parts. On the other hand, at the center of the jaw in the lengthwise direction, there is a tubular packaging material to be laterally sealed. Therefore, when the sealing jaws sandwich the tubular packaging material, the jaw is at the center of the longitudinal direction. There is a possibility that it will bend outwards, and the clamping force of the packaging material by the jaws will be insufficient, resulting in poor lateral sealing.

In particular, in the case of a vertical pillow in which the vertical seal portion in which both side edges of the band-shaped packaging material overlap each other is located at the center in the width direction of the bag, the thickness of the vertical seal portion is large, and therefore a greater clamping force is exerted. Therefore, the sealing jaw is more likely to bend outward at the central portion in the length direction, and the possibility of lateral sealing failure increases.

On the other hand, according to the present invention, the horizontal movement mechanism uses the crank-link mechanism to linearly reciprocate the horizontal seal member in the horizontal direction. In addition, since the connecting point between each horizontal seal member and the link is arranged at the central portion in the longitudinal direction of the seal member, the pressing force from the link directly acts on the central portion in the longitudinal direction of the seal member. Therefore, when the seal members are in contact with each other, the tubular packaging material existing in the central portion in the longitudinal direction of the seal members can be sufficiently strongly sandwiched by the seal members, and even if the vertical seal portion having a large thickness is the width of the bag. Even in the case of the vertical pillow positioned in the middle of the direction, it is possible to suppress a problem that the sealing member has insufficient clamping force of the packaging material to cause a lateral sealing defect.

Next, in the invention described in claim 5, in the invention described in claim 4, when the lateral seal members are in contact with each other, a connecting point between the crank and the link, the link and each lateral part are provided. It is characterized in that the connection points with the seal member are arranged in a line substantially in the moving direction of the seal member.

According to the present invention, when the seal members are brought into contact with each other, the crank-link mechanism causes the seal members to toggle, and the link is pushed back by the reaction force from the sandwiched packaging material to cause the seal members to move. It is possible to prevent the clamping force from being loosened. Hereinafter, the present invention will be described in more detail through embodiments of the invention.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a vertical bag-making packaging machine 1 according to this embodiment has a tube 2 extending vertically in the center of the front surface, and having a tubular shape around the tube 2. The film F droops. The tubular film F is formed by bending a band-shaped film by a former (not shown) provided on the upper portion of the tube 2. The strip-shaped film is unwound from a film roll set at the rear of the packaging machine 1 and supplied to the former.

The tubular film F is pulled down by traveling of a pair of pull-down belts 3 and 3 (only the left one is shown in FIG. 1) arranged on the left and right sides of the tube 2, and the tubular film F is pulled down. The overlapping side edges are vertically sealed by the vertical sealing device 4 disposed on the front side, and laterally sealed in the width direction by the horizontal sealing device 5 disposed below the tube 2 to form the bag X. During that time, the bag X is filled with the articles introduced from above the tube 2 between the horizontal seals. The bags X are separated one by one by a cutter (not shown) built in the horizontal sealing device 5, and further transported to the downstream of the production line.

As shown in FIG. 2, the horizontal sealing device 5 includes a pair of front and rear sealing jaws 11a and 11b. The sealing jaws 11a and 11b extend horizontally from side to side and are attached to the bases 12a and 12b, respectively. Base 12
The a and 12b are supported by the support unit 13 so as to be horizontally movable back and forth. For example, the cutter is housed in the rear jaw base 12b.

The support unit 13 has a pair of left and right support blocks 15, 15 connected by a connection frame 14.
A support rod 16 extending in the front-rear direction is slidably inserted in each block 15. The front jaw base 12a is stretched over the front ends of the support rods 16 and 16, and the connecting base 17 is stretched over the rear ends. Each support rod 16 is supported by an arm portion 18 extending forward from the block 15 to maintain a horizontal posture. Rear jaw base 1
2b is slidably fitted to the support rods 16 and 16 between the arms 18 and 18 and the blocks 15 and 15.

The seal jaws 11a and 11b are reciprocally moved back and forth by a crank mechanism. That is, as shown in FIG. 3, from the upper surface of the connection frame 14, the spline shaft 20
Has an upper end protruding upward, and a crank 21 is fitted to the protruding end of the spline shaft 20. As shown in FIG.
A link 22a for the front jaw 11a is provided between one rotating end of the crank 21 and the connecting base 17, and a rear jaw is provided between the other rotating end of the crank 21 and the rear jaw base 12b. Link 22b for 11b
Is provided.

As shown in FIG. 2, the sealing jaws 11a,
When the spline shaft 20 rotates in the direction of the arrow a from the state where the 11b are separated from each other, the crank 21 also integrally rotates in the same direction a, and the rotation is converted into a linear motion in the front-rear direction by the links 22a and 22b. Among them, the front jaw link 22a pushes the connecting base 17 rearward, thereby moving the entire frame structure including the connecting base 17, the pair of left and right support rods 16 and the front jaw base 12a rearward. , The front seal jaw 11a is horizontally moved backward. On the other hand, the rear jaw link 22b presses the rear jaw base 12b forward, whereby
The rear seal jaw 11b is horizontally moved forward.

From the center of rotation of the crank 21, each link 22
The distances to the connecting points of a and 22b are the same, and the shapes of the links 22a and 22b are also the same. Therefore, due to the rotation of the single spline shaft 20, the pair of front and rear sealing jaws 11a and 11b simultaneously move in the opposite directions by the same distance. As a result, as shown in FIG. 4, the sealing jaws 11a and 11b are in contact with each other with the tubular film F sandwiched therebetween. Then, during this contact, the tubular film F is laterally sealed by heat and pressure.

From this state, the spline shaft 20 moves toward the arrow b.
When rotated in the direction, the front seal jaw 11a horizontally moves forward and the rear seal jaw 11b moves in the same manner as described above.
At the same time, moves horizontally backward by the same distance. As a result, as shown in FIG. 2, the sealing jaws 11a and 11b are separated from each other. In this packaging machine 1, the crank 21
And the links 22a, 22b, etc.
A horizontal movement mechanism (denoted by H) for horizontally moving a and 11b is configured. And the support unit 13
Is the horizontal movement mechanism H and the sealing jaws 11a and 11b.
And support.

As shown in FIG. 3, the spline shaft 20 stands upright and vertically penetrates the connection frame 14 of the support unit 13. A pair of upper and lower horizontal beams 42a and 42b are installed on the front surface of the main body 100 of the packaging machine 1. A bearing 27 is provided on the inner surface of the lower beam 42b of the horizontal beams 42a and 42b, and the lower part of the spline shaft 20 is rotatable by the bearing 27. Supported by.

As shown in FIG. 1, a timing pulley 26 is attached to the lower end of the spline shaft 20, and between the timing pulley 26 and the timing pulley 24 attached to the output shaft of the horizontal movement servomotor 23. The timing belt 25 is wrapped around. That is,
When the servo motor 23 is driven, the spline shaft 20 moves a,
The seal jaws 11a and 11b open and close by rotating in the b direction. The servo motor 23 is installed on the packaging machine body 100 by a bracket or the like (not shown).

As shown in FIG. 3, the upper and lower horizontal beams 42
A pair of left and right guide rods 45, 45 are provided on a and 42b via mounting blocks 43, 43, 44, 44. Each guide rod 45 stands upright in parallel with the spline shaft 20, and supports the support block 1 of the support unit 13, respectively.
5 is penetrated up and down. Thereby, the support unit 1
3 is supported by two guide rods 45, 45 and one spline shaft 20 at three points. Moreover, as shown in FIG. 2, since the guide rods 45, 45 and the spline shaft 20 are located at the apexes of the triangle in plan view, the support unit 13 is stably supported on the surface.

The support unit 13 is vertically reciprocated along the rods 45, 45 and the shaft 20 by a crank-link mechanism. That is, as shown in FIG. 3, a pair of left and right vertical walls 36, 36 is provided upright from the packaging machine body 100. As shown in FIG. 2, a crankshaft 35 is rotatably provided between the vertical walls 36, 36. Crank arms 37, 37 are attached to both ends of the crankshaft 35. As shown in FIG. 1, one end of an intermediate link 40 is connected to the rotating end of each crank arm 37. The other end of the intermediate link 40 is connected midway along the length of the swing link 39.

As shown in FIG. 2, a shaft 38 for swinging fulcrum is also rotatably provided between the vertical walls 36, 36. One ends of the swing links 39, 39 are attached to both ends of the swing fulcrum shaft 38. As shown in FIG. 1, the support block 15 of the support unit 13 is attached to the swing end of each swing link 39 via the second intermediate link 41.
Are connected.

A vertical movement servomotor 31 is installed on the packaging machine main body 100, and between a timing pulley 32 attached to the output shaft of the motor 31 and a timing pulley 34 attached to the crankshaft 35. The timing belt 33 is wrapped around. That is, the drive of the servomotor 31 causes the crankshaft 35 to rotate in the c direction, and the support unit 13 moves up and down. At that time, the rotation of the crank arm 37 causes the intermediate link 40 to move up and down, thereby swinging the swing link 39 up and down. The swinging link 39 absorbs the twist of the circular arc motion and the linear motion by the second intermediate link 41, and at the same time, the supporting unit 13 as a whole, and by extension, the horizontal sealing jaws 11a, 11a.
b and the horizontal moving mechanism H are moved up and down.

FIG. 1 shows the state where the support unit 13 is at the top dead center, and FIG. 5 shows the state where it is at the bottom dead center. Although not shown in detail, at the top dead center, the seal jaw 11
For example, a and 11b tend to be closed because the horizontal sealing starts immediately. Further, at the bottom dead center, the sealing jaws 11a and 11b are likely to open, for example, because the horizontal sealing has already been completed. In the packaging machine 1, the crank arm 37, the plurality of links 39 to 41, and the like constitute a vertical movement mechanism (denoted by V) that vertically moves the support unit 13.

A well-known ball spline is used for the engaging portion (indicated by symbol A in FIG. 3) between the spline shaft 20 and the connection frame 14 of the supporting unit 13.
That is, as shown in some detail in FIG.
Is directly connected to the ball spline 81 and participates in the rotation transmission of the spline shaft 20. The cross roller bearing 82 and the outer housing 83 exist between the spline shaft 20 and the connection frame 14, and the spline shaft 20 and the connection frame 14 are not in direct contact with each other. That is, the rotation of the spline shaft 20 is cut off. However, it is slidable only in the vertical direction. Accordingly, the spline shaft 20 can achieve the transmission of the driving force to the horizontal movement mechanism H and the guide of the vertical movement of the support unit 13 without any trouble.

In this packaging machine 1, the sealing jaws 11a,
11 b is horizontally moved by a horizontal moving mechanism H so as to face or separate (open and close), and is vertically moved together with the support unit 13 by a vertical moving mechanism V. This allows
The sealing jaws 11a and 11b execute a box motion as shown by the loci S and S in FIG.

In that case, in particular, the sealing jaws 11a,
For horizontal movement of 11, the servo motor 23 moves the spline shaft 2
This is achieved by rotating 0 in the a and b directions and driving the horizontal moving mechanism H by the spline shaft 20.
The servo motor 23 and the spline shaft 20 which are heavy objects
Since the support unit 13 which is the target of the vertical movement of the vertical movement mechanism V is not provided with the above, and the packaging machine main body 100 is provided, the weight of the support unit 13 side is reduced, and the support unit 13 and the seal jaws 11a, The vertical movement of 11b can be accelerated.

In this packaging machine 1, the support unit 1
A pair of guide rods 4 for guiding the vertical movement of 3
5 and 45, the spline shaft 20 originally provided for driving the horizontal movement mechanism H vertically penetrates the support unit 13 in parallel with the pair of guide rods 45, 45 to serve as a guide rod. Since this also functions, it is possible to support the support unit 13 at three points while achieving commonality of members, reduction of the number of parts, and simplification of the structure without newly installing extra members. The posture of the support unit 13 is stabilized or the vertical movement thereof is smoothed, and the support unit 13 and the seal jaws 11a and 11b are ensured to operate at high speed in the vertical direction together with the weight reduction of the support unit 13 described above.

Moreover, the load for guiding the vertical movement of the support unit 13 is dispersed between the guide rods 45, 45 and the spline shaft 20, and the load is not concentrated only on the spline shaft 20. Therefore, the load for transmitting the driving force to the horizontal movement mechanism H and the load for the guide of the support unit 13 are concentrated on the spline shaft 20, and it is easy for the load to be increased. Therefore, it is necessary to improve the rigidity of the spline shaft 20. To avoid the problem.

Further, since the guide rods 45, 45 and the spline shaft 20 are arranged at the apexes of the triangle in a plan view and are not arranged side by side in one row, the support unit 13 can be stably supported on the surface. The supporting unit 13 does not tilt or flutter, and the posture of the supporting unit 13 is further stabilized. Moreover, the guide rod 45,
45 are evenly arranged on the left and right with respect to the support unit 13, and the spline shaft 20 is arranged at the middle in the left-right direction.
The support surface is an isosceles triangle, providing better balance,
A sense of stability increases.

The pair of sealing jaws 11a and 11a
Since only one spline shaft 20 is used to open and close b, also in this respect, common members can be used, the number of parts can be reduced, and the structure can be simplified. In addition, the operations of the sealing jaws 11a and 11b are easily synchronized, and a smooth contact (close) operation or separation (open) operation is realized. In that case, since the pair of seal jaws 11a and 11b simultaneously move in opposite directions to be brought into contact with or separated from each other, the moving distance of each seal jaw 11a and 11b may be short, and in this respect also, the high speed of the packaging machine 1 is achieved. Contribute to driving.

In particular, when the moving distances of the sealing jaws 11a and 11b are the same as in the packaging machine 1, the contact positions of the jaws 11a and 11b can be easily identified, and as a result, the front and rear of the tubular film F can be determined. There is also an advantage that the position in the direction and the position in the front-rear direction of the lateral sealing device 5 can be easily aligned.

In the horizontal moving mechanism H, the rear jaw link 22b is connected to the rear jaw base 12b at the longitudinal center of the rear jaw 11b. As a result, the forward pressing force from the link 22b directly acts on the central portion of the sealing jaw 11b in the longitudinal direction. Therefore, when the sealing jaws 11a and 11b are in contact with each other, the tubular film F existing in the central portion in the length direction can be firmly and strongly sandwiched between the sealing jaws 11a and 11b. As a result, the side edges of the strip-shaped film are overlapped with each other, and the vertical seal portion having a large thickness has the sealing jaws 11a,
Even in the case of a vertical pillow located at the center of the lengthwise direction of 11b, the sealing jaws 11b tend to flex outward, and the clamping force of the cylindrical films F by the jaws 11a and 11b is insufficient, resulting in a horizontal seal. Problems such as defects are reduced.

Further, as shown in FIG. 4, when the sealing jaws 11a and 11b are in contact with each other, in the horizontal movement mechanism H, the connecting point between the front jaw link 22a and the connecting base 17, the front jaw link 22a and the crank. 21, the connection point between the rear jaw link 22b and the crank 21, and the connection point between the rear jaw link 22b and the rear jaw base 12b are almost the same.
1b are lined up in one row in the front-rear direction in which they move horizontally. then,
The crank 21 and the links 22a and 22b have a posture extending in the front-rear direction.

As a result, the sealing jaws 11a and 11b are
When the jaws are contacted with each other, the jaws 11a and 11b are toggled, and the links 22a and 22b are pushed back by the reaction force from the sandwiched tubular film F, so that the links 2
2a, 22b and the crank 21 are tilted, and the seal jaw 1
It is suppressed that the clamping force of 1a and 11b loosens.

[0053]

As described above, according to the present invention, both the weight reduction and the stabilization of the support member of the seal jaw are satisfied, so that the seal jaw can be moved up and down at a high speed, and the box motion type This contributes to improving the capacity of the bag making and packaging machine. Moreover, since no extra member is newly installed for that purpose, there is an advantage that the packaging machine can be prevented from becoming complicated and soaring. INDUSTRIAL APPLICABILITY The present invention is expected to be widely used in a box motion type vertical bag making and packaging machine.

[Brief description of drawings]

FIG. 1 is a schematic right side view showing a main part of a vertical bag-making packaging machine according to an embodiment of the present invention.

FIG. 2 is a view taken along the line A-A in FIG.

FIG. 3 is an arrow view of a partial cutout taken along the line EE in FIG.

FIG. 4 is a plan view of the lateral sealing device with the sealing jaws in contact with each other (closed).

FIG. 5 is a right side view of the lateral sealing device in a state where the sealing jaw is lowered to the bottom dead center.

FIG. 6 is a schematic enlarged vertical sectional view showing an engagement portion between a spline shaft and a support unit.

[Explanation of symbols]

1 Vertical bag making and packaging machine 5 Horizontal sealing device 11a, 11b Seal jaws (lateral seal member) 13 Support unit (support member) 20 spline shaft (rotating shaft) 21 cranks (horizontal movement mechanism) 22a, 22b links (horizontal movement mechanism) 23 Servo motor for horizontal movement (drive source) 45 Guide rod 100 wrapping machine body F Cylindrical film (packaging material)

Claims (5)

[Claims] 1. A vertical bag-making packaging machine for forming a vertically extending tubular packaging material, filling an article into the tubular packaging material, and vertically and horizontally sealing the tubular packaging material, A pair of lateral sealing members that laterally seal the tubular packaging material by horizontally moving and contacting each other, a horizontal moving mechanism that horizontally moves the pair of lateral sealing members, and the horizontal moving mechanism and the lateral A support member that supports the seal member, a vertical movement mechanism that moves the support member in the vertical direction, and a pair of guide rods that guide the vertical movement of the support member. A rotary shaft that is provided and that engages with the horizontal moving mechanism to drive the horizontal moving mechanism; and a drive source that is also provided on the packaging machine main body side and that rotates the rotary shaft. The support is parallel to the pair of guide rods. Vertical bag packaging machine, characterized in that extending through the member up and down. 2. The vertical bag-making packaging machine according to claim 1, wherein the pair of guide rods and the rotary shaft are not arranged in a line. 3. The rotating shaft is one, and the horizontal moving mechanism receives the rotation of the one rotating shaft and simultaneously moves the pair of horizontal seal members in opposite directions by a crank and a link. The vertical bag-making packaging machine according to claim 1 or 2. 4. The vertical bag-making packaging machine according to claim 3, wherein the link and each horizontal seal member are connected at a central portion in the lengthwise direction of the horizontal seal member. 5. A contact point between the crank and the link and a contact point between the link and each of the horizontal seal members are aligned in a line substantially in the moving direction of the seal member when the horizontal seal members are in contact with each other. The vertical bag-making packaging machine according to claim 4, wherein.