JP2003160102A - Bag-making method for vertical packaging machine, and vertical bag-making-packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag-making-packaging machine which can realize various kinds of operating method by one machine, and is excellent in versatility, and has a favorable usability. <P>SOLUTION: A film F is intermittently carried, and while the film F is stopped, a lateral sealing is performed by sealing jaws 11a and 11b for a low speed mode. The film F is continuously carried in such a manner that the carrying speed may be variable, and while the film F is carried at a uniform speed, the lateral sealing is performed. Also, in a period TX prior to the lateral sealing, a pre-treatment motion such as ironing is performed for an intermediate speed mode. The film F is continuously carried at a uniform speed, and while the film F is carried at the uniform speed, the lateral sealing is performed for a high speed mode. Such low speed mode, intermediate mode and high speed mode are automatically switched in response to the operating conditions of a packaging machine, and thus, the packaging machine is operated. Preparing various kinds of packaging machines for respective operating modes is not required, and thus, this vertical bag-making-packaging machine becomes advantageous in cost. <P>COPYRIGHT: (C)2003,JPO

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 for filling a bag with articles while molding the bag, and belongs to the technical field of improving the versatility of the bag-making packaging machine.

[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 the article, the tubular packaging material is vertically and horizontally sealed to form a bag. In that case, Japanese Patent No. 2537360 and Japanese Unexamined Patent Publication No. 6-239311.
As disclosed in Japanese Unexamined Patent Publication (Kokai), etc., the tubular packaging material is generally pulled down and transported by a transporting means such as a roller or a belt arranged on the side of the tube.

At this time, the vertical seal seals both side edges of the overlapping packaging materials, and since the overlapping margin extends in the longitudinal direction of the tubular packaging material, it is not necessary to move the vertical sealing device. By vertically transporting the tubular packaging material, the tubular packaging material can be continuously vertically sealed.
On the other hand, the horizontal seal is a pair of sealing jaws that sandwich the tubular packaging material in the width direction orthogonal to the longitudinal direction for a predetermined time to seal it by heat and pressure. When the bag is completed, its upper end portion is sealed. Alternatively, since the lower end portion is formed, in principle, horizontal sealing cannot be performed unless the transportation of the tubular packaging material is stopped. When attempting to laterally seal a tubular packaging material while transporting it, it is necessary to move the sealing jaws along with the packaging material in the vertical direction at the same speed.

Therefore, one of the methods is to intermittently convey the tubular packaging material and laterally seal the tubular packaging material by contacting a pair of sealing jaws while the transportation is stopped. There is. In this method, the tubular packaging material is intermittently transported by the length of the bag. The sealing jaws perform opening and closing movements such as horizontally facing each other (closing or separating) and separating (opening), but need not move vertically with the tubular packaging material. In this intermittent transfer method, although the number of processed pieces is generally low, the transfer of the packaging material and the opening / closing of the jaws can be operated independently of each other. Can be laterally sealed and also
It is possible to accommodate bags of any length.

In contrast to the intermittent transfer method, the transfer speed of the packing material is kept constant (a constant speed is maintained) as a method in which the sealing jaws are brought into contact with each other and laterally sealed while the cylindrical packing material is continuously transferred. ), And those that increase or decrease the transport speed of the packaging material during transport. In any case, in these continuous transfer systems, the sealing jaws move in the longitudinal direction together with the packaging material during the period of contact with the tubular packaging material as well as the opening / closing movement for contacting and separating from each other. Moving. In particular,
During the lateral seal in which the packaging materials are placed in contact with each other and sandwich the packaging material, the packaging materials move at the same speed so as to be integrated with the packaging materials.

Among them, the constant velocity continuous transfer method has a simple operation and does not complicate the control even at the time of starting or stopping. In addition, the meandering of the packaging material is suppressed, and the local application of large tension to the packaging material is reduced, which is suitable for high-speed operation.

On the other hand, since the variable speed continuous transfer system can generate a relative speed in the vertical direction between the tubular packaging material and the sealing jaws, work other than horizontal sealing, for example, good packaging is realized. It is possible to carry out an auxiliary pretreatment work for doing so. For example, before the sealing jaws are brought into contact with each other to laterally seal the tubular packaging material, if the conveying speed of the tubular packaging material is made smaller than the moving speed of the jaws while the jaws and the packaging material are in contact with each other. The sealing jaws can squeeze the tubular wrapping material downward, thereby preventing the jaw from biting the contents already filled in the tubular wrapping material. On the contrary, if the transport speed of the tubular packaging material is made higher than the moving speed of the jaws, the sealing jaws can squeeze the tubular packaging material upward to sag the bottom portion of the packaging material. It is possible to efficiently fill the packaging material with the article to be put next.

However, such pretreatment work can be performed by increasing or decreasing the vertical moving speed of the sealing jaws. Therefore, the moving speed of the sealing jaws is controlled not only by the variable speed transfer method but also by the constant speed transfer method. Can also be realized by. Further, since it is only necessary that a vertical relative speed be generated between the tubular packaging material and the sealing jaws, the sealing jaws may be moved while the packaging material is stopped not only by the continuous transportation method but also by the intermittent transportation method. Alternatively, it can be realized by transporting the packaging material while the sealing jaws are stopped. However, in the case of the variable speed transfer system, it is not necessary to increase or decrease the vertical moving speed of the seal jaws.

A D-motion machine and a box-motion machine are typical typical continuous-conveyance bag making and packaging machines including a constant-speed continuous conveyance method and a variable speed continuous conveyance method. The D-motion machine swivels the sealing jaws and brings the sealing jaws into contact with each other within the range where the swirling circles overlap each other. During the contact period, the centers of the turning circles are moved closer to or farther from each other, and the contact surface of the jaw is linearly moved in the transport direction of the packaging material. As a result, the seal jaw draws a substantially D-shaped trajectory in one cycle operation. Box motion machine
The seal jaws are linearly reciprocally moved in the facing and separating directions, and are also linearly reciprocally moved in the conveying direction of the tubular packaging material.
The seal jaw draws a substantially quadrilateral or elliptical locus in one cycle operation by a combination of those movements.

[0010]

By the way, in recent years, due to the variety of tastes of consumers and the differentiation of products accompanying them, small-quantity multi-product production is frequently performed. As a result, in the production of one product, it is an operating condition of the packaging machine that the horizontal sealing time is long because the packaging material is thick, and in the production of another product, the ironing work is essential because the contents are bulky. And
In addition, production capacity is emphasized in the production of other products.

However, in the conventional case, for example, in the case of a box motion machine, the opening / closing operation of the sealing jaw and the vertical movement operation are interlocked with each other, so that in order to open / close the sealing jaw during one cycle operation, the packaging material must be conveyed. The jaws must be moved longitudinally in the direction. In other words, it is not possible to open and close the seal jaw in the state where it is stopped in the transport direction of the packaging material. Particularly, in the case of a D-motion machine, since the turning of the sealing jaw is an opening / closing operation and a vertical movement operation, the opening / closing and the vertical movement of the sealing jaw are mechanically inseparable.

Therefore, for example, in order to laterally seal a thick packaging material over a long time using such a continuous transport type packaging machine, the packaging jaws are moved while the packaging material is being transported. In the middle of the operation, it is necessary to perform an emergency evacuation operation that is not in the original operation mode, such as temporarily stopping the transportation of the packaging material and the movement of the sealing jaws. And since such actions are usually not pre-programmed, in most cases,
The worker has to manually manage the one-cycle operation of the packaging machine, which is not practical.

The present invention has been made in view of the above circumstances, and a bag-making machine capable of realizing various operating modes by one machine according to various kinds of production items and operating conditions of the packaging machine accompanied therewith. An object of the present invention is to provide a vertical bag-making packaging machine which is excellent in versatility and can be used for carrying out the method and the bag-making method.

[0014]

That is, according to the first aspect of the present invention, there is provided a conveying step of vertically conveying a vertically extending tubular packaging material, and the tubular packaging material with a pair of horizontal sealing members. A bag making method in a vertical packaging machine, comprising a step of sandwiching and horizontally sealing, as the carrying step,
A first transporting step of intermittently transporting the tubular packaging material, a second transporting step of continuously transporting the tubular packaging material at a variable transport speed, and a first transporting step of continuously transporting the tubular packaging material at a constant speed. At least two carrying steps out of a plurality of carrying steps of the carrying step No. 3 are provided, and the plurality of carrying steps are switched to perform bag making.

According to this bag-making method, at least in the case where the tubular packaging material is conveyed in the vertical direction and the tubular packaging material is laterally sealed to make a bag, the tubular packaging material as described above is used. Since two or more arbitrary transfer methods among intermittent transfer, variable-speed continuous transfer, and constant-speed continuous transfer are switched to make a bag, for example, the intermittent transfer method is selected as the transfer method for the tubular packaging material. In this case, the packaging material with a large thickness can be laterally sealed for a sufficiently long time, and when the variable speed continuous transfer method is selected, it is possible to apply a squeezing operation to bulky contents, and to perform constant speed continuous operation. When the transportation method is selected, products can be produced at high speed. As a result, it becomes possible to selectively realize various operating methods by one machine according to various production items and the operating conditions of the packaging machine accompanying it.

Next, the invention described in claim 2 is the same as claim 1.
In the invention described in above, when performing the first transporting step, the sealing step is performed while the tubular packaging material is stopped, and when performing the second transporting step or the third transporting step, the sealing step is performed. The sealing step is performed while the tubular packaging material is being transported at a constant speed.

According to the present invention, as described above, when the intermittent transfer method is selected, the sealing step is performed while the tubular packaging material is stopped, so that, for example, a packaging material having a large thickness takes a sufficiently long time. Can be laterally sealed. On the other hand, when the continuous transport method is selected, the sealing step is performed during the period when the tubular packaging material is transported at a constant speed regardless of whether it is the constant speed method or the variable speed method. The longitudinal movement speed of the seal member moving at a speed is also constant, and the conveyance control of the packaging material and the movement control of the seal member during the sealing step are simplified as much as possible.

The invention described in claim 3 is the same as that of claim 1.
Alternatively, in the invention according to the aspect 2, before performing the sealing step, at least one speed of the vertical conveyance speed of the tubular packaging material and the vertical movement speed of the horizontal sealing member is controlled to control the cylinder. It is characterized by including a pretreatment step for generating a relative speed in the longitudinal direction between the packaging material and the transverse sealing member.

According to the present invention, as described above, by increasing or decreasing at least one of the transporting speed of the tubular packaging material and the moving speed of the lateral sealing member (both including zero), the sealing member is tubular. Pre-processing operations such as squeezing the packaging material downward and sagging the bottom of the tubular packaging material with a sealing member can be performed.

Particularly, in the case where the transport speed of the tubular packaging material is changed exclusively in the first transport step and the second transport step,
Since it is not necessary to change the moving speed of the horizontal seal member or to increase the change of the moving speed of the horizontal seal member, a mechanism for supporting the horizontal seal member or a mechanism for moving the horizontal seal member in the vertical direction is used. The durability is improved. When the moving speed of the horizontal seal member is changed exclusively in the second transfer step and the third transfer step, it is not necessary to change the transfer speed of the tubular packaging material at least during the pretreatment work. Alternatively, since it is not necessary to increase the change in the transport speed of the tubular packaging material, the meandering of the packaging material can be suppressed / prevented.

[0021] Next, the invention according to claim 4 is a conveying means for vertically conveying a vertically extending tubular packaging material, and a pair of horizontal sealing members for laterally sandwiching the tubular packaging material. , The 1
Horizontal moving means for horizontally moving the pair of horizontal sealing members to contact and separate from each other, vertical moving means for vertically moving the pair of horizontal sealing members, vertical conveying means for the conveying means, horizontal moving means. A vertical bag-making and packaging machine having a control means for controlling the means, wherein the control means controls the transport means by a first transport mode for intermittently transporting the tubular packaging material, and the cylinder. At least two transport modes are selected from a plurality of transport modes including a second transport mode for continuously transporting the tubular packaging material at variable transport speeds and a third transport mode for continuously transporting the tubular packaging material at a constant speed. And a switching means for switching the plurality of transport modes.

According to this packaging machine, the cylindrical packaging material is conveyed in the vertical direction, the pair of horizontal sealing members is opened / closed (horizontal movement in the horizontal direction), and the packaging material is also conveyed by the pair of horizontal sealing members. When the movement along the direction (vertical movement in the vertical direction) is configured to be possible, among the intermittent transfer of the tubular packaging material, the variable speed continuous transfer, and the constant speed continuous transfer as described above. ,
Since it is possible to switch between any two or more transport methods,
For example, when the intermittent transport method is selected as the transport method for the tubular packaging material, it is possible to laterally seal the packaging material having a large thickness over a sufficiently long time, and when the variable speed continuous transport method is selected, The ironing operation can be applied to high contents, and when the constant speed continuous transfer method is selected, the product can be produced at high speed. As a result, it becomes possible to selectively execute various operating methods with one machine according to a wide variety of production items and the operating conditions of the packaging machine associated therewith, and a bag-making packaging machine that is excellent in versatility and easy to use. It will not be necessary to have all types of packaging machines for each operation method provided.

Next, the invention described in claim 5 is the invention according to claim 4.
In the invention described in (1), the control means, when performing the first transport mode, causes the lateral movement means to contact the pair of lateral seal members while the tubular packaging material is stopped, When performing the second transport mode or the third transport mode, control is performed such that the pair of horizontal seal members are brought into contact with each other by the lateral moving means during the uniform speed transportation of the tubular packaging material. .

According to the present invention, similarly to the second aspect of the present invention, when the intermittent transfer method is selected, horizontal sealing is performed while the tubular packaging material is stopped. Horizontal sealing can be done over a long period of time. On the other hand, when the continuous transport method is selected, the horizontal sealing is performed during the period in which the tubular packaging material is transported at a constant speed regardless of whether it is the constant speed method or the variable speed method. The vertical movement speed of the seal member moving at a speed is also constant, and the conveyance control of the packaging material and the movement control of the seal member during the horizontal sealing are simplified as much as possible.

Next, the invention according to claim 6 relates to claim 4
Alternatively, in the invention described in the paragraph 5, the control means, before contacting the pair of lateral seal members with each other by the lateral movement means,
It is characterized in that at least one of the conveying means and the vertical moving means is controlled to perform control to generate a relative speed in the vertical direction between the tubular packaging material and the horizontal sealing member.

According to the present invention, as in the third aspect of the invention, by increasing or decreasing at least one of the conveying speed of the tubular packaging material and the moving speed of the lateral seal member (both of which include zero), Pretreatment work such as squeezing the tubular packaging material downward with the sealing member or sagging the bottom of the tubular packaging material with the sealing member can be performed.

In particular, when the transport speed of the tubular packaging material is changed exclusively in the first transport mode or the second transport mode, it is not necessary to change the moving speed of the horizontal seal member, or the horizontal seal member is moved. Since it is not necessary to greatly change the speed, the durability of the mechanism for supporting the horizontal seal member or the vertical moving means for moving the horizontal seal member in the vertical direction is improved. Further, when the moving speed of the horizontal seal member is changed exclusively in the second transfer mode and the third transfer mode, the transfer speed of the tubular packaging material does not have to be changed at least during the pretreatment work. Alternatively, since it is not necessary to increase the change in the transport speed of the tubular packaging material, the meandering of the packaging material can be suppressed / prevented.

Next, the invention according to claim 7 relates to claim 4
The invention according to any one of 1 to 6, further comprising a designating unit for designating an operating condition of the packaging machine, wherein the switching unit comprises:
It is characterized in that the plurality of transfer modes are automatically switched according to the operating condition designated by the designating means.

According to the present invention, if the operating condition of the packaging machine is designated according to, for example, the production item, the optimum transport mode is automatically selected and executed. There is no need to look at the production items of, select the transport mode with experience or can, or manually switch to the selected transport mode. Therefore, the packaging machine is always operated in the optimal transfer mode without being affected by the operator skill.

Next, the invention according to claim 8 relates to claim 7
In the invention described in (1), the operating condition is at least one of the capability of the packaging machine, the time required for lateral sealing, the length of the bag, and the thickness of the packaging material.

According to these inventions, a few examples of operating conditions that can be specified are embodied. For example, when the capacity of the packaging machine is designated, for example, the uniform speed continuous transfer method (third transfer mode) suitable for high-speed operation is preferentially selected.
On the other hand, when the lateral sealing time, bag length, packaging material thickness, etc. are specified, for example, the intermittent transportation method (first transportation) in which the packaging material transportation operation and the sealing member opening / closing operation can be freely set, respectively. Mode) is selected with priority. Hereinafter, the present invention will be described in more detail through embodiments of the invention.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION In this embodiment, the present invention is applied to a vertical bag-making packaging machine 1 shown in FIG.
This bag making and packaging machine 1 has a tube 2 extending vertically in the center of the front surface, and a tubular film F hangs around the tube 2. 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 the 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, while the tube 2 is being pulled down. The overlapping side edges are vertically sealed by the vertical sealing device 4 disposed on the front side of the container, 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.

In this packaging machine 1, the pull-down belts 3 and 3 and the pulleys 3a and 3a around which the belts 3 and 3 are wound.
(Refer to FIG. 3) and a film transport servomotor 6 (see FIG. 7) for rotating the pulleys 3a, 3a in the directions of the arrows d, d, etc., for transporting the vertically extending tubular film F in the vertical direction. The symbol Z) is configured.

As shown in FIG. 2, the lateral 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 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 arrow a from the state where 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. Then, the front sealing jaw 11a is horizontally moved rearward. 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 mutually opposite directions by the same distance. As a result, as shown by the solid line in FIG.
The sealing jaws 11a and 11b sandwich (and close) the tubular film F 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 it is rotated in the opposite direction, conversely to the above, the front seal jaw 11a horizontally moves forward and the rear seal jaw 11b moves.
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 (opened) from each other.

In the packaging machine 1, the seal jaws 11a,
A horizontal movement mechanism (denoted by reference numeral h) that horizontally moves (opens and closes) 11b is configured. The support unit 13 includes the horizontal movement mechanism h and the seal jaw 11.
a and 11b are supported.

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 1a of the packaging machine 1, and a bearing 27 is provided on the inner surface of the lower beam 42b of the horizontal beams 42a and 42b.
The lower portion of the spline shaft 20 is rotatably supported by 7.

As shown in FIG. 1, a timing pulley 26 is attached to the lower end of the spline shaft 20, and the timing pulley 26 and the output pulley of the horizontal movement (jaw opening / closing) servo motor 23 are attached. A timing belt 25 is wrapped around the belt 24. That is, by driving the servo motor 23, the spline shaft 20 rotates in the a and b directions, and the seal jaw 11
a and 11b open and close. The servomotor 23 is installed on the packaging machine body 1a by a bracket or the like (not shown).

In this packaging machine 1, a pair of sealing jaws 11 is provided by the horizontal moving mechanism h and the servomotor 23.
Lateral movement means (denoted by reference numeral H) for moving the a and 11b in the horizontal direction so as to contact and separate from each other is configured.

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 are provided upright from the packaging machine body 1a. 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 servo motor 31 for vertical movement (for raising and lowering the jaw) is installed on the packaging machine body 1a, and the motor 31
A timing belt 33 is wound around a timing pulley 32 attached to the output shaft of the above and a timing pulley 34 attached to the crankshaft 35. That is, the crankshaft 35 rotates in the c direction by the driving of the servo motor 31, and the support unit 1
3 moves up and down. At that time, the rotation of the crank arm 37 causes the intermediate link 40 to move up and down, and the swing link 3
Swing 9 up and down. The swinging link 39 vertically reciprocates the support unit 13 as a whole, by extension, the horizontal sealing jaws 11a and 11b, the horizontal moving mechanism H, etc., while absorbing the twist of the circular motion and the linear motion by the second intermediate link 41. .

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 are slightly closed because lateral sealing starts immediately, for example. At bottom dead center, the seal jaw 1
1a and 11b are slightly open, for example, because the horizontal seal has already been completed.

In this packaging machine 1, the crank arm 3 is used.
An up-and-down moving mechanism (denoted by a symbol v) that moves (raises and lowers) the support unit 13 up and down is constituted by 7 and the plurality of links 39 to 41 and the like. The vertical movement mechanism v and the servomotor 31 constitute a vertical movement means (denoted by V) for moving the pair of seal jaws 11a and 11b in the vertical direction along the transport direction of the tubular film F. There is.

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. Thereby, 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,
11b is contacted or separated (opened / closed) by the lateral movement means H.
And is vertically moved by the vertical moving means V together with the support unit 13. As a result, the sealing jaws 11a and 11b execute a quadrangle or oval box motion in a side view, as indicated by the loci S and S in FIG.

In this packaging machine 1, the support unit 1
A pair of guide rods 4 for guiding the vertical movement of 3
5, 45, and 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. Is also functioning as. Therefore, it is possible to support the support unit 13 at three points and even on the surface while achieving the common use of the members, the reduction of the number of parts, and the simplification of the structure without newly installing an extra member. The posture of 13 is stabilized or the vertical movement thereof is facilitated, and as a result, high-speed vertical operation of the support unit 13 and the seal jaws 11a and 11b is ensured.

As shown in FIG. 7, the packaging machine 1 includes a film transport means Z (servo motor 6 for film transport).
And jaw vertical moving means V (jaw lifting servomotor 3
1) and a control unit 100 for controlling the jaw lateral moving means H (jaw opening / closing servo motor 23). The control unit 100 controls the film transport means Z to continuously transport the tubular film F at a low speed mode (intermittent transport system: first transport mode) and at a variable transport speed. Medium speed mode (variable speed continuous transfer method: second transfer mode) and high speed mode in which the tubular film F is continuously transferred at a constant speed (constant speed continuous transfer method: third transfer mode)
Each operation program of is stored in the memory.

As shown in FIG. 8, when the control unit 100 executes the low speed mode, while the tubular film F is stopped (time tb to ta), the lateral movement means H causes the sealing jaws 11a, Lateral sealing is performed by contacting 11b (horizontal sealing time TS: time tc to td). On the other hand, when the medium speed mode and the high speed mode are executed, horizontal sealing is performed while the tubular film F is being conveyed at a constant speed (horizontal sealing time TS: time tc to td).

When performing the horizontal seal, the control unit 100 adjusts the vertical moving speed of the seal jaws 11a and 11b so that the horizontal seal portion does not protrude from a predetermined seal area and a sealing failure does not occur. The film-shaped film F is made to coincide with the vertical conveyance speed. Therefore, in the low speed mode in which the horizontal sealing is performed while the tubular film F is stopped, the sealing jaws 11a and 11b do not move in the vertical direction (zero speed). The sealing jaws 11a and 11b are fixed at predetermined height positions. Of course, this predetermined height position may be changed arbitrarily.

On the other hand, in the medium speed mode and the high speed mode in which the horizontal sealing is performed during the uniform speed transportation of the tubular film F, the sealing jaws 11a and 11b are kept at the transportation speed of the tubular film F at least during the lateral sealing time TS. It moves downward at the same speed. In order to move the sealing jaws 11a and 11b at a predetermined speed in the longitudinal direction at a constant speed, in this packaging machine 1,
As shown by the broken line in FIG. 8, the lifting servomotor (S
The drive speed of M) 31 is decreased along the sinusoidal curve during that period. The lifting servomotor 31 rotates at a constant speed as a basic operation. As a result, the seal jaw 1
The vertical movement speed (elevation speed) of 1a and 11b draws a sine wave curve as illustrated.

When executing the medium speed mode, the control unit 100 uses the lateral moving means H to move the sealing jaw 11
During a predetermined period before contacting a and 11b (from time te to
tc), the transport speed of the tubular film F is reduced to generate a relative speed in the longitudinal direction between the film F and the sealing jaws 11a and 11b. At the same time, during that period (time te to tc), the sealing jaws 11a and 11b are not completely contacted with each other but are loosely contacted with the tubular film F. Then, in the example of FIG. 8, the sealing jaws 11a,
Since the moving speed of 11b becomes faster than the conveying speed of the film F, the cylindrical jaws F can be formed by the sealing jaws 11a and 11b.
Can be squeezed down (pretreatment time TX). Alternatively, instead of reducing the transport speed of the tubular film F, or together with this, the moving speed of the sealing jaws 11a and 11b may be increased.

Further, the transport speed of the tubular film F may be increased during the pretreatment time TX (time te to tc).
In that case, since the moving speed of the sealing jaws 11a and 11b becomes lower than the conveying speed of the film F, the cylindrical film F can be squeezed upward by the sealing jaws 11a and 11b to slacken the bottom portion of the film F. Alternatively, instead of increasing the transport speed of the tubular film F,
Alternatively, along with this, the moving speed of the seal jaws 11a and 11b may be reduced.

In any case, the tubular film F is mainly used.
When changing the transport speed of the seal jaws 11a,
Since it is not necessary to change the moving speed of 11b or to change the moving speeds of the sealing jaws 11a and 11b, the durability of the vertical moving means V for moving the sealing jaws 11a and 11b in the vertical direction is improved. improves. When the moving speed of the seal jaws 11a and 11b is mainly changed, at least the period T of the pretreatment work is performed.
During X, since it is not necessary to change the transport speed of the tubular film F or to increase the transport speed of the tubular film F, it is possible to suppress the meandering of the tubular film F.
It can be prevented.

Further, it is possible to perform such pre-processing work in the low speed mode or the high speed mode according to the above.
However, in the low speed mode, as described above, since the sealing jaws 11a and 11b do not move in the vertical direction (zero speed), a relative speed in the vertical direction is generated between the tubular film F and the sealing jaws 11a and 11b. In order to do so, the transport speed of the tubular film F must be increased or decreased. Therefore,
The durability of the vertical moving means V for vertically moving the seal jaws 11a and 11b is improved. Conversely, in high speed mode,
As described above, since the tubular film F is conveyed only at a constant speed, the tubular film F and the sealing jaws 11a and 11a are not moved.
In order to generate a relative speed in the vertical direction with respect to b, there is no choice but to increase or decrease the moving speed of the seal jaws 11a and 11b. Therefore, the meandering of the tubular film F can be suppressed / prevented.

The period indicated by reference character C in FIG.
Is a period of one cycle operation. Also, the length of the bag X in which the shaded area indicated by the symbol L is obtained is shown. In the low speed mode, the film F is conveyed between times ta and tb. This film transport time (ta to tb) can be set freely. Further, the film F is horizontally sealed between the times tc and td. This lateral sealing time TS (tc to td) can also be set freely.

Therefore, although the one-cycle operation period C is relatively long and the production capacity tends to be low, in the low speed mode, the transport of the film F and the opening / closing of the jaws 11a and 11b can be operated independently of each other. The lateral sealing time TS can be set to be sufficiently long to satisfactorily laterally seal even the thick film F, and the bag X of any length L can be supported. This operation is possible because the packaging machine 1 is configured so that the horizontal movement means H and the vertical movement means V are not interlocked with each other and can be controlled independently. Needless to say.

On the other hand, in the high speed mode, the transport operation of the film F is relatively simple. Therefore, control is not complicated even when starting or stopping. Moreover, since the film F is conveyed at a constant speed, meandering of the film F is suppressed, and the local application of a large tension to the film F is reduced.
In this high speed mode, the sealing time TS and the length L of the bag X are
Is traded for one cycle operation period C
Can be shortened, and above all, it is suitable for high-speed operation.

In that case, the sealing time TS, the length L of the bag X, and the one-cycle operation period C have a relationship influencing each other. For example, if the seal time TS is increased,
The transport speed of the film F and the moving speed of the jaws 11a and 11b may be reduced. However, as a result, the one-cycle operation period C becomes longer. Further, for example, if the length L of the bag X is to be increased, the non-sealing time (time td to tc)
The moving speed of the inside jaws 11a and 11b may be reduced. However, similarly, the one-cycle operation period C becomes longer.
That is, by lengthening the one-cycle operation period C somewhat, even in the high-speed mode, the sealing time TS and the length L of the bag X are reduced.
Can be lengthened. However, when the seal time TS is lengthened, (time t
d-tc), the one-cycle operation period C can be shortened again by increasing the moving speed of the jaws 11a and 11b.

On the other hand, in the medium speed mode, the transport speed of the tubular film F is increased / decreased so that the tubular film F is squeezed downward or sagged upward to realize good packaging. Auxiliary pretreatment work T for
The feature is that X is performed. In FIG. 8, for comparison, the sealing time TS is the same in the medium speed mode and the high speed mode. In the medium speed mode, the time required to move the sealing jaws 11a and 11b at a constant speed becomes longer because the pretreatment time TX is required. That is, in the high speed mode, the sealing jaws 11a,
The constant velocity moving time of 11b is between time tc and td,
In the medium speed mode, the period starts from time te before that (time te to td). As a result, the seal jaw 1
The period (1 cycle operation period) C of the sine wave curve of the moving speeds of 1a and 11b becomes long, and the number of processed pieces becomes lower than that in the high speed mode. However, as described above, during the period other than the constant velocity moving time (time td to te), the seal jaw 1
By increasing the moving speed of 1a, 11b,
It goes without saying that the cycle operation period C can be shortened.

As shown in FIG. 7, the packaging machine 1 is provided with an operation panel 200 for outputting an operation condition designation signal to the control unit 100. The operator operates the operation panel 200 to specify the operating conditions of the packaging machine 1. The operating conditions are, for example, the capacity of the packaging machine 1, the time TS required for lateral sealing, the length L of the bag X, the thickness of the film F, and the like. Further, since the contents are bulky, it may be whether or not to perform the ironing work.

It does not matter how to specify the operating conditions. For example, a worker may directly input a numerical value for the operating condition by using the input key, or a plurality of buttons for designating the operating condition may be provided in advance on the operation panel 200, and the worker may press the corresponding button to specify the operating condition. You may do it. Alternatively, since the product master is usually stored in the memory of this type of packaging machine, the product master can be utilized. That is, data (operating conditions) such as bag length and film thickness are registered in the product master for each item. Then, the operator specifies the next production item on the operation panel 200. The control unit 100 reads the above data from the product master of the specified item and processes the read data as the specified operation condition.

The control unit 100 automatically switches between the low-speed, medium-speed, and high-speed transfer modes described above according to the operation conditions designated in this way, and the packaging machine 1
To drive. For example, when the capacity of the packaging machine 1 is designated, the high speed mode is preferentially selected. Horizontal seal time T
When S, bag length L, packaging material thickness, etc. are designated, the low speed mode is preferentially selected. When the preprocessing work TX is requested, the medium speed mode is preferentially selected. Of course, two or more of these operating conditions may be designated. In that case, the mode is selected so that each operating condition is satisfied within the range where the ability is maximized. At that time, as described above, even in the high speed mode and the medium speed mode, the sealing time TS and the bag X are traded in exchange for lengthening the one cycle operation period C by controlling the film transport speed and the jaw moving speed. Considering that the length L can be increased.

FIG. 9 shows an example of the concrete contents of the product master and FIG. 10 shows the specific contents of the operation condition table. As illustrated in FIG. 9, in the product master, for each item, the internal capacity, other information, that is, the capacity (times / minute), the bag length (m
m), ... Are registered in advance. Of these, capabilities and bag length are essential registration items. On the other hand, it can be said that the sealing time, the film thickness, the necessity of the ironing work or the sagging work, and the like are optional registration items. And
For the operation mode item, the operator must manually enter
Alternatively, the control unit 100 automatically sets.

As illustrated in FIG. 10, for example, in the low speed mode, the capacity is 60 (times / minute) or less, the sealing time is 300 (msec) or more, and the bag length is 300 (m).
m) or more, and the film thickness is 80 (μ) or more. However, this is the case where there is no ironing work or sagging work, and when performing these pre-treatment works TX,
It may be considered that the cycle operation time C becomes longer accordingly. In this example, both ironing work and sagging work,
It takes 150 (msec) or more in the low speed mode, 100 to 150 (msec) in the medium speed mode, and 100 (msec) or less in the low speed mode.

Further, the mode can be designated by the number of films instead of the film thickness (μ). That is, as shown in FIG. 11 (a), when the bag is made in the form of an envelope, for example, the vertical seal portion has three layers as surrounded by a circle. The total thickness of the film when attached and laterally sealed is three times the thickness per film. Similarly, FIG.
As shown in Fig. 11, when the bag is made in the form of a ply palm, the thickness is four times, and as shown in Fig. 11 (c), when the bag is made in the form of a gusset bag, the gusset part on the side is also included. Double the thickness. Therefore, for example, when the number of films to be sandwiched at the time of horizontal sealing is 4 or more, the low speed mode is selected, when 3 to 4 the medium speed mode is selected, and when 3 or less, the high speed mode is selected. May be.

In this way, the operator only needs to specify the operating conditions of the packaging machine 1 using the operation panel 200, and the optimum transport mode is automatically selected and executed. There is no need to look at the production items and select the transport mode based on experience or cans, or manually switch to the selected transport mode. Therefore, the packaging machine 1 is always operated in the optimum transport mode without being affected by the operator skill.

In this packaging machine 1, various operating methods can be selectively realized by one machine according to a wide variety of production items and a variety of operating conditions of the packaging machine 1. The machine 1 is excellent in versatility and is easy to use, and in addition, it is not necessary to arrange a packaging machine for each operation method, which is advantageous in terms of cost.

As the transfer mode, transfer modes other than the three transfer modes of low speed, medium speed, and high speed described above may be adopted, and the number of transfer modes is three or more. Good. In any case, it suffices to be able to switch between a plurality of transport modes of two or more of them.

Further, the pretreatment work TX such as ironing of the tubular film F and sagging of the bottom portion is performed by the sealing jaws 11a and 11a.
Instead of b, a dedicated ironing member provided in the vicinity of the seal jaws may be used as disclosed in Japanese Utility Model Laid-Open No. 6-20209.

[0077]

As described above, according to the present invention, various operating methods can be selectively executed by one packaging machine, and thus the present invention can be preferably applied to the small-quantity multi-product production which has been frequently performed in recent years. INDUSTRIAL APPLICABILITY The present invention is expected to be widely used in bag making and packaging machines such as vertical pillow type bag making and packaging machines.

[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.

FIG. 7 is a control system configuration diagram of the packaging machine.

FIG. 8 is a time chart of the main operation of each mode of the packaging machine.

FIG. 9 is an example of specific contents of a product master of the packaging machine.

FIG. 10 is an example of specific contents of an operation condition table of the packaging machine.

FIG. 11 is a schematic cross-sectional view showing a typical form of a bag produced by the packaging machine.

[Explanation of symbols]

1 Bag-making packaging machine 3 Pull-down belt (conveying means) 5 Horizontal sealing device 6 Servo motor for film conveyance (conveying means) 11a, 11b Sealing jaw (lateral sealing member) 21 Crank (lateral moving means) 22a, 22b Link (lateral movement) 23) Servo motor for opening and closing jaws (horizontal moving means) 31 Servo motor for lifting jaws (longitudinal moving means) 37 Crank arm (longitudinal moving means) 39-41 Link (longitudinal moving means) 100 Control unit (control means, switching means) ) 200 Operation panel (designating means) F Cylindrical film (cylindrical packaging material)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65B 57/00 B65B 57/00 D (72) Inventor Takafumi Otani 1959, Shimoha, Ritto City, Shiga Prefecture Fern Shiga Works (72) Inventor Toshiharu Kageyama 1 959 Shimoho, Ritto City, Shiga Prefecture F Term in Ishida Shiga Works (Reference) 3E050 AA02 AB02 AB08 BA04 BA11 CA02 CB01 CB03 DC02 DC08 DC09 DF03 DH04 FA01 FB01 FB07 GA01 GB05 HA02 HA08 HB01 HB09 HB10 3E094 AA13 BA12 CA06 CA15 DA07 DA08 EA03 FA01 FA02 GA02 GA04 GA05 GA13 HA11

Claims (8)

[Claims] 1. A vertical packaging machine comprising: a conveying step of vertically conveying a vertically extending tubular packaging material; and a sealing step of horizontally sealing by sandwiching the tubular packaging material with a pair of horizontal sealing members. In the bag manufacturing method, the transporting step includes a first transporting step for intermittently transporting the tubular packaging material, a second transporting step for continuously transporting the tubular packaging material at a variable transport speed, and A bag-making machine in a vertical packaging machine, which comprises at least two carrying steps out of a plurality of carrying steps including a third carrying step for carrying the tubular packaging material continuously at a constant speed, and which carries out bag making by switching the plurality of carrying steps. Method. 2. The bag manufacturing method for the vertical packaging machine according to claim 1, wherein when the first carrying step is performed, the sealing step is performed while the tubular packaging material is stopped, A bag making method in a vertical packaging machine, wherein when the second carrying step or the third carrying step is carried out, the sealing step is carried out during the uniform speed carrying of the tubular packaging material. 3. The bag-making method in the vertical packaging machine according to claim 1, wherein, before performing the sealing step, a vertical conveying speed of the tubular packaging material or the horizontal sealing member A bag-making method in a vertical packaging machine, comprising a pretreatment step of controlling at least one of the moving speeds in the vertical direction to generate a relative speed in the vertical direction between the tubular packaging material and the horizontal sealing member. 4. A conveyance means for vertically conveying a vertically extending tubular packaging material, a pair of horizontal sealing members for laterally sandwiching the tubular packaging material, and a horizontal pair of the horizontal sealing members. A horizontal moving means for moving the pair of horizontal seal members in a vertical direction, a vertical moving means for vertically moving the pair of horizontal seal members, and a control means for controlling the conveying means, the horizontal moving means, and the vertical moving means. In a vertical bag-making packaging machine having, the control means, as a control for the transport means, a first transport mode of intermittently transporting the tubular packaging material, and a transport speed of the tubular packaging material. At least two transfer modes are provided among a plurality of transfer modes including a second transfer mode in which variable continuous transfer is performed and a third transfer mode in which the tubular packaging material is continuously transferred at a constant speed, and the plurality of transfer modes are provided. Vertical bag making and packaging machine equipped with a switching means for switching between. 5. The vertical bag-making packaging machine according to claim 4, wherein the control means, when performing the first transport mode,
While the tubular packaging material is stopped, the pair of lateral sealing members are brought into contact with each other by the lateral moving means, and the second transport mode or the third transportation mode is set.
The vertical bag-making packaging machine performs control so that the pair of horizontal sealing members are brought into contact with each other by the horizontal moving means during the constant-speed transportation of the tubular packaging material. 6. The vertical bag-making packaging machine according to claim 4 or 5, wherein the control means is configured to convey the conveying means before the pair of horizontal sealing members are brought into contact with each other by the horizontal moving means. Alternatively, a vertical bag-making packaging machine that controls at least one of the vertical moving means to generate a relative speed in the vertical direction between the tubular packaging material and the horizontal sealing member. 7. The vertical bag-making packaging machine according to claim 4, further comprising: designating means for designating an operating condition of the packaging machine, wherein the switching means is designated by the designating means. A vertical bag-making packaging machine that automatically switches between the plurality of transfer modes in accordance with the specified operating conditions. 8. The vertical bag-making packaging machine according to claim 7, wherein the operating condition is one of the capability of the packaging machine, the time required for horizontal sealing, the length of bag and the thickness of packaging material. At least 1
Vertical bag making and packaging machine.