JP2023089657A - Bag-making and packaging device - Google Patents

Abstract

To provide a bag-making and packaging device capable of securing a high bag-making capability in the bag-making and packaging device including the operation of folding a lower lateral seal portion T2.SOLUTION: A bag-making and packaging device comprises: a cylindrical member 31 for allowing a commodity to fall inside; a former for forming a film into a cylindrical shape; a conveying mechanism for conveying the film to the downstream side; a vertical sealing mechanism; a lateral sealing mechanism for forming a lower lateral seal portion T2 of the film; a folding member 92 for folding the lateral seal portion; and a control unit. The control unit moves the folding member 92 in a first direction to fold the lower lateral seal portion T2, and then moves the folding member 92 in a conveying direction of the film by the conveying mechanism.SELECTED DRAWING: Figure 14

Description

There is an application for exception to loss of novelty

The present invention relates to a bag making and packaging apparatus.

Conventionally, as disclosed in Patent Document 1 (Japanese Patent No. 3922928), there has been known a bag making and packaging apparatus for making a bag having a square bottom as a packaging bag. In the device of Patent Document 1, a plate for folding the bottom seal portion connected to the square bottom moves in the horizontal direction to fold the bottom seal portion into the lower surface of the square bottom.

As in the bag making and packaging apparatus of Patent Document 1, the plate that folds the horizontally sealed bottom seal portion (horizontally sealed portion) is returned to its original position as soon as possible so as not to interfere with subsequent transportation of the packaging material. preferred to return.

However, it is impossible to eliminate the time required to return the plate from the position where the lateral seal portion was folded to the original position, and it takes some time. On the other hand, in order to ensure a high bag-making capacity, it is desirable to avoid obstruction of the transportation of the packaging material by the plate as much as possible.

SUMMARY OF THE INVENTION An object of the present invention is to ensure high bag-making capacity in a bag-making and packaging apparatus that folds a horizontal seal portion.

A bag-manufacturing and packaging apparatus according to a first aspect is a bag-manufacturing and packaging apparatus that manufactures bags in which products are packaged. The bag-making and packaging apparatus includes a tubular member, a former, a conveying mechanism, a vertical sealing mechanism, a first member, a horizontal sealing mechanism, a second member, and a controller. The tubular member is a tubular member in which the product drops. A former is a member for forming a sheet-like packaging material into a tubular shape. The former wraps the packaging material around the cylindrical member. The transport mechanism transports the cylindrical packaging material downstream. The vertical sealing mechanism vertically seals the seams of the tubular packaging material. The first member is in contact with the tubular packaging material from the outside to shape the tubular packaging material into a square tube. The horizontal seal mechanism laterally seals the rectangular tube-shaped packaging material to form a horizontal seal portion in the packaging material. The second member is a member that folds the lateral seal portion. After the second member is moved in the first direction to fold the lateral seal portion, the control unit moves the second member in the transport direction of the packaging material by the transport mechanism.

In the bag making and packaging apparatus of the first aspect, after the control unit moves the second member to fold the lateral seal portion, the second member moves in the conveying direction of the packaging material. As a result, the second member is less likely to interfere with the transportation of the packaging material, and the bag-making capacity can be enhanced, compared to the conventional bag-making and packaging apparatus in which the second member does not move in the transportation direction of the packaging material.

A bag-manufacturing and packaging apparatus according to a second aspect is the bag-manufacturing and packaging apparatus according to the first aspect, wherein the controller moves the second member in the conveying direction of the packaging material after folding the lateral seal portion, and moves the second member in the first direction. moving the second member in a second direction opposite to the

In the bag making and packaging apparatus of the second aspect, after the second member is moved to fold the lateral seal portion, the control unit moves the second member in the conveying direction of the packaging material and moves the second member in the second direction. . As a result, the second member can be removed at an early stage from the space on the downstream side in the conveying direction of the bag made, and the bag making capacity can be further increased.

A bag-manufacturing and packaging apparatus according to a third aspect is the bag-manufacturing and packaging apparatus according to the first aspect or the second aspect, wherein the control unit moves the second member in the first direction while the transportation of the packaging material by the transportation mechanism is stopped. to fold the horizontal seal. Further, after folding the lateral seal portion, the control unit moves the second member in the transport direction of the packaging material, and causes the transport mechanism to resume transporting the packaging material.

The bag-manufacturing and packaging apparatus of the third aspect is a bag-manufacturing and packaging apparatus that transports packaging materials intermittently. In this form-fill-seal apparatus, after the control unit moves the second member to fold the lateral seal portion, it moves the second member in the transport direction of the packaging material and resumes transporting the packaging material.

In the conventional bag-making and packaging apparatus, the transportation of the packaging material is kept suspended until the member that folds the horizontal sealing portion is separated from the transportation path of the packaging material. By moving the folded second member in the transport direction of the packaging material, transport of the packaging material can be resumed at an early timing.

A bag-manufacturing and packaging apparatus according to a fourth aspect is the bag-manufacturing and packaging apparatus according to any one of the first to third aspects, wherein the lateral sealing mechanism includes first and second sealing jaws, first sealing jaws and a seal jaw drive for driving the second seal jaw. The first sealing jaw and the second sealing jaw are arranged to face each other with the tubular packaging material interposed therebetween. The seal jaw drive has a first drive and a second drive. The first driving section moves the first sealing jaw and the second sealing jaw along the first direction. The second driving section moves the first sealing jaw and the second sealing jaw along the transport direction of the packaging material. The second driving section further moves the second member in the transport direction of the packaging material.

In the bag making and packaging apparatus of the fourth aspect, the second driving portion of the sealing jaw driving portion of the horizontal sealing mechanism not only moves the first sealing jaw and the second sealing jaw along the conveying direction of the packaging material, but also It also plays the role of moving the two members in the transport direction of the packaging material. That is, the second driving section plays both a role of moving the first sealing jaw and the second sealing jaw and a role of moving the second member. As a result, the manufacturing cost of the bag making and packaging apparatus can be suppressed.

A bag-manufacturing and packaging apparatus according to a fifth aspect is the bag-manufacturing and packaging apparatus according to the fourth aspect, further comprising a third driving section. The third drive section is provided separately from the first drive section. The third driving section moves the second member in the first direction.

In the bag making and packaging apparatus of the fifth aspect, the first driving section moves the first sealing jaw and the second sealing jaw along the first direction, and the third driving section moves the second member in the first direction. , are provided separately. Thus, a complicated link mechanism or the like is used to move the first sealing jaw and the second sealing jaw for lateral sealing in the first direction and the second member for folding the lateral sealing portion in the first direction. You can do it at the right time without any hassle.

A bag-manufacturing and packaging apparatus according to a sixth aspect is the bag-manufacturing and packaging apparatus according to any one of the first to fifth aspects, wherein the first direction is a horizontal direction. The conveying direction of the packaging material by the conveying mechanism is the vertically downward direction.

According to the bag-manufacturing and packaging apparatus of the present invention, the second member hardly interferes with the transportation of the packaging material, and the bag-manufacturing capacity can be enhanced.

Fig. 2 shows a gusseted bag; 1 is an external perspective view of a bag making and packaging apparatus; FIG. FIG. 2 is a schematic side view of the bag making and packaging apparatus; The front view which shows the main part of a bag making packaging unit. The side view which shows the main part of a bag making packaging unit. FIG. 4 is a perspective view of a horizontal sealing mechanism and a bag bottom forming mechanism mounted on a vertically movable platform; FIG. 4 is a plan view of the horizontal sealing mechanism and the bag bottom forming mechanism; FIG. 4 is a side view showing main parts of a horizontal sealing mechanism and a bag bottom forming mechanism; 4 is a perspective view of the tubular member, sealing jaws and lower gusset forming member; FIG. FIG. 4 is a front view of the tubular member, sealing jaws and lower gusset forming member; Control block diagram. FIG. 10 is a diagram showing the positions of the sealing jaws and folding members immediately after lateral sealing; FIG. 10 is a diagram showing the positions of the sealing jaws and the folding member immediately after the folding member folds the lower lateral seal portion; FIG. 10 is a diagram showing a state in which the sealing jaws and the folding member are being lowered after the folding member has folded the lower lateral seal portion; FIG. 10 is a view showing a state in which the folding member folds the lower laterally sealed portion, and then the sealing jaws and the folding member have finished descending and have retreated from the space below the rectangular tubular film; The figure which shows the state where a sealing jaw and a folding member are located in a home position. FIG. 10 is a view showing the state before the horizontal sealing operation of the sealing jaws and the rectangular tube-shaped film during continuous bag making of the bag making and packaging apparatus of Modification A; FIG. 10 is a diagram showing a state immediately after the horizontal sealing operation of the sealing jaws and the rectangular tube-shaped film during continuous bag making of the bag making and packaging apparatus of Modification A;

A bag making and packaging apparatus 1 according to an embodiment of the present invention will be described. In the following description, "left" and "right" of the bag making and packaging apparatus 1 are based on the case where the bag making and packaging apparatus 1 is viewed from the front side.

(1) Overall Configuration of Bag-Making and Packaging Apparatus FIGS. 2 and 3 show an overall view of the bag-making and packaging apparatus 1. FIG. The bag-making and packaging apparatus 1 shown in these figures is a machine for bagging products such as snacks. It is composed of a film supply unit 6 for supplying F and a control section 100 . In addition, operation switches 7 are arranged on the front surface (one side surface) of the bag making and packaging unit 5, and a liquid crystal display 8 indicating the operation state is arranged at a position where the user who operates the operation switches 7 can visually recognize. ing.

FIG. 1 shows a gusset type bag 50 manufactured by the bag making and packaging machine 1 . The bag 50 is a stand pack that has four side portions 51 and one bottom portion 52 and can stand on its own using the bottom portion 52 as a support surface. In other words, the stand pack means a self-supporting bag, like the bag 50, having a bottom portion serving as a support surface. The bag 50 has an upper gusset (folding) G1, a lower gusset (folding) G2, four hem seal portions H1 to H4, a longitudinal seal portion L1, an upper lateral seal portion T1, and a lower lateral seal portion T2. formed.

The bag 50 is a bag formed from a single rectangular sheet-like film F, and is formed by folding a predetermined position of the film F and heat-sealing (heat-sealing) the predetermined position. be. More specifically, bag 50 is formed mainly by the following steps. That is, a sheet-like film F is formed into a square tube shape having four side portions, ie, a right side portion, a front portion, a left side portion and a rear portion. The four side portions of the rectangular tube-shaped film F (hereinafter referred to as the rectangular tube-shaped film Fc) will later become the four side portions 51 of the bag 50 . Next, by heat-sealing both edges of the films F overlapping each other due to the rectangular tubular shape, a vertical seal portion L1 is formed. Next, four hem-sealed portions H1 to H4 are formed by vertically heat-sealing the four corners of the rectangular tubular film Fc. Next, the gussets G1 and G2 are formed by folding the side surfaces of the rectangular tubular film Fc facing each other into the inner side of the rectangular tubular film Fc. The bottom portion 52 of the bag 50 is formed by forming the lower gusset G2. At the same timing as the formation of the gussets G1 and G2, two laterally sealed portions T1 and T2 are formed by laterally heat-sealing predetermined portions of the rectangular tubular film Fc. The upper lateral seal portion T1 defines the upper portion of the bag 50, and the lower lateral seal portion T2 defines the lower portion of the bag 50. As shown in FIG. As described above, the bag 50 is manufactured.

(2) Details of Each Part of Bag Making and Packaging Apparatus Details of each part of the bag making and packaging apparatus 1 will be described below.

(2-1) Film supply unit The film supply unit 6 is a unit that supplies the sheet-like film F to the forming mechanism 13 of the bag-making and packaging unit 5 described later, and is adjacent to the bag-making and packaging unit 5. is provided. A film roll around which the film F is wound is set in the film supply unit 6, and the film F is fed out from this film roll.

(2-2) Bag Making and Packaging Unit FIGS. 4 and 5 show the main parts of the bag making and packaging unit 5. FIG.

The bag making and packaging unit 5 mainly includes a forming mechanism 13, a conveying mechanism 14, a hem forming mechanism 18, a vertical sealing mechanism 15, a horizontal sealing mechanism 17, a bag bottom forming mechanism 19, an upper gusset forming member 93, 93 and a support frame 12 that supports these mechanisms and members. A casing 9 is attached around the support frame 12 . The forming mechanism 13 forms the sheet-like film F sent from the film supply unit 6 into a square tube. The conveying mechanism 14 conveys downward the rectangular tube-shaped film Fc formed into a rectangular tube shape by the forming mechanism 13 . The hem forming mechanism 18 forms hem seal portions H1 to H4 at the four corners of the rectangular tubular film Fc. The vertical sealing mechanism 15 heat seals the overlapping portions of the rectangular tubular films Fc in the vertical direction. The horizontal sealing mechanism 17 seals the bag 50 by laterally heat-sealing the upper and lower ends of the bag 50 of the rectangular tubular film Fc. The bag bottom surface forming mechanism 19 is a mechanism for forming the bottom surface portion 52 of the bag 50 of the rectangular tubular film Fc.

The horizontal sealing mechanism 17 and the bag bottom forming mechanism 19 are mechanisms mounted on the vertically movable frame 20 shown in FIG.

(2-2-1) Forming Mechanism The forming mechanism 13 has a tubular member 31 and a former 32 .

The tubular member 31 has a cylindrical upper portion. The lower portion of the tubular member 31 is shaped like a square tube having a front surface, a rear surface, a right side surface, and a left side surface. The cylindrical member 31 has a cylindrical shape from the upper end to the central portion in the height direction, and the shape gradually changes into a rectangular tube shape from the central portion in the height direction toward the lower end. The tubular member 31 extends in the vertical direction and has open top and bottom ends. The cylindrical member 31 is arranged so as to pass vertically through an opening formed near the center of the top plate 29 of the support frame 12, and is fixed to the former 32 via a bracket (not shown). Products that drop by a predetermined amount from the computer scale 2 provided above the bag-making and packaging unit 5 are put into the opening at the upper end of the tubular member 31 . The product falls inside the tubular member 31 . The computer scale 2 is a combination weighing device composed of feeders, pool hoppers, weighing hoppers, collecting discharge chutes, and the like.

The former 32 is arranged near the top of the tubular member 31 so as to surround the tubular member 31 . The former 32 is formed into a cylindrical shape when the sheet-like film F sent from the film supply unit 6 passes through the gap between the former 32 and the cylindrical member 31, and is conveyed toward the lower end. The shape is such that the film F is gradually formed into a rectangular tubular shape. In other words, the former 32 is a member that winds the sheet-like film F around the tubular member 31 and forms the film F into a tubular shape to form the rectangular tubular film Fc. The former 32 is fixed to a substrate 33a of a support member 33 supported by the support frame 12 (see FIGS. 4 and 5).

(2-2-2) Hem Forming Mechanism The hem forming mechanism 18 has a pair of hem forming units 70 and 71 and a pair of hem sealing units 80 and 81 . The hem forming units 70 and 71 are arranged symmetrically with respect to the longitudinally extending cylindrical member 31 and are arranged below the joining portion between the cylindrical member 31 and the former 32 . The hem seal units 80, 81 are arranged bilaterally symmetrical about the longitudinally extending cylindrical member 31, directly below the hem forming units 70, 71, and directly above the pull-down belts 40, 41, which will be described later. are placed in The hem seal units 80 and 81 each have a pair of heater blocks 82 and 82 and a heater block cover plate 83 .

The hem forming mechanism 18 is publicly known as described in Japanese Patent Application Laid-Open No. 2008-168931, for example, and therefore the detailed configuration will not be described here.

When the bag-making and packaging apparatus 1 is driven, the four corner portions of the rectangular tube-shaped film Fc pass through predetermined gaps and are conveyed downstream. As a result, the four corners of the square tube-shaped film Fc are creased, and the hem seal portions H1 to H4 shown in FIG. 1 are formed. Further, when the bag-making and packaging apparatus 1 is driven, the heater block 82 is moved at a predetermined timing, and the sealing surface of the heater block 82 sandwiches the hem seal portions H1 to H4 of the rectangular tubular film Fc. pressed against. As a result, the hem-sealed portions H1 to H4 of the rectangular tubular film Fc are heat-sealed.

(2-2-3) Transport Mechanism The transport mechanism 14 is a mechanism for transporting the rectangular tubular film Fc downstream, and has a pair of pull-down belts 40 and 41 . The pull-down belts 40 and 41 are supported by support members (not shown) suspended from the top plate 29 of the support frame 12 . The pull-down belts 40 and 41 are arranged symmetrically with respect to the cylindrical member 31 extending in the vertical direction. It plays a role of conveying downward while sucking.

(2-2-4) Vertical Sealing Mechanism The vertical sealing mechanism 15 vertically seals the seam of the packaging material of the rectangular tubular film Fc. The vertical seal mechanism 15 is supported by a support member (not shown) suspended from the top plate 29 of the support frame 12 . The vertical sealing mechanism 15 has a heater, a heater belt heated by the heater, and the like, faces the front of the cylindrical member 31, and is located at substantially the same position in the vertical direction as the four heater blocks 82 of the hem sealing units 80 and 81. (see FIGS. 4 and 5). The vertical sealing mechanism 15 presses the longitudinally extending overlapping portions (the seams of the packaging material) of the square tubular film Fc wound around the tubular member 31 against the front surface of the tubular member 31 with a constant pressure. By heating and sealing while heating, a longitudinal seal portion L1 is formed on the front portion of the rectangular tubular film Fc.

(2-2-5) Lateral Sealing Mechanism FIGS. 6 and 7 show the lateral sealing mechanism 17 and the bag bottom forming mechanism 19 mounted on the vertically movable frame 20. FIG. FIG. 8 shows a side view showing the height positions of the main parts of the horizontal sealing mechanism 17 and the bag bottom forming mechanism 19. As shown in FIG.

The lateral seal mechanism 17 is arranged below the tubular member 31 and supported by the support frame 12 . The lateral sealing mechanism 17 is mainly composed of a pair of sealing jaws 90,90. The sealing jaws 90, 90 move back and forth in the horizontal plane by moving a sealing jaw drive motor 121 shown in FIG. 7 so as to approach and separate from each other. More specifically, the sealing jaws 90, 90 move synchronously with each other and symmetrically about the rectangular tubular film Fc being conveyed downward. The sealing jaws 90, 90 sandwich the rectangular tube-shaped film Fc in the state of being closest to each other. Hereinafter, the position shown in FIG. 16, which will be described later, is called the retracted position of the sealing jaws 90, 90, and the position shown in FIG. 12 is called the advanced position of the sealing jaws 90, 90.

Each sealing jaw 90 has a heater inside. The heater heats the sealing surfaces of the sealing jaws 90 (surfaces facing each other during lateral sealing), and heat-seals the portions of the rectangular tubular film Fc sandwiched between the two sealing jaws 90, 90 to be laterally sealed. , an upper lateral seal portion T1 and a lower lateral seal portion T2 are formed. The sealing jaws 90, 90 perform a single sandwiching operation to perform the upper lateral sealing portion T1 of the bag 50 manufactured first among the two consecutive bags 50, 50 manufactured by the bag making and packaging apparatus 1, and At the same time, the lower lateral sealing portion T2 of the bag 50 to be manufactured is formed. A cutter (not shown) is incorporated in one of the sealing jaws 90, and the center of the portion heat-sealed by one sandwiching operation is laterally cut by the cutter. By this cutting, the bags 50 are cut off one by one from the rectangular tubular film Fc extending in the longitudinal direction.

(2-2-6) Bag Bottom Forming Mechanism The bag bottom forming mechanism 19 mainly comprises a pair of left and right lower gusset forming members 91 , 91 and a folding member 92 .

(2-2-6-1) Lower Gusset Forming Member The lower gusset forming members 91, 91 are arranged above the seal jaws 90, 90, and are plate-like members having a triangular shape in plan view. The lower gusset forming members 91, 91 play the role of forming lower gussets G2 on the right side and left side of the rectangular tubular film Fc.

The lower gusset forming members 91, 91 are connected to a driving mechanism comprising a cam mechanism, a first air cylinder 91a, etc., and reciprocate in the horizontal plane so as to approach or separate from each other. In particular, the cam mechanism serves to synchronize movement of the lower gusset forming members 91,91 and sealing jaws 90,90. That is, the lower gusset forming members 91, 91 reciprocate between the retracted position separated from each other and the advanced position close to each other (see FIGS. 9 and 10).

More specifically, the lower gusset forming members 91, 91 reciprocate in synchronization with each other in the same cycle, and move symmetrically about the rectangular tubular film Fc conveyed in the vertical direction.

While the left lower gusset forming member 91 moves rightward from the retracted position to the advanced position, it comes into contact with the vicinity of the upper part of the left side surface of the square tube-shaped film Fc, which will be the lower lateral seal part T2. The contact portion is folded inside the rectangular tubular film Fc. Similarly, the right lower gusset forming member 91 moves leftward from the retracted position to the advanced position, and comes into contact with the vicinity of the upper part of the right side surface of the square tube-shaped film Fc, which will be the lower lateral seal part T2. Then, the contact portion is folded inside the rectangular tubular film Fc. As a result, the lower gussets G2 are formed on the right side and left side of the rectangular tubular film Fc.

(2-2-6-2) Folding Member The folding member 92 is a member having a shape as shown in FIGS. It has a plate shape along the This portion is located above the sealing jaw 90 and below the lower gusset forming members 91, 91 (see FIG. 8). The folding member 92 serves to fold down the lower lateral seal portion T2 formed by the sealing jaws 90, 90 toward the bottom portion 52 of the bag 50 formed by the lower gusset forming members 91, 91. As shown in FIG.

The folding member 92 is connected to a drive mechanism including a second air cylinder 92a, and reciprocates in the horizontal plane in the front-rear direction. That is, the folding member 92 reciprocates between a retracted position (see FIG. 12) away from the front portion of the square tubular film Fc and an advanced position (see FIG. 13) close to the front portion of the square tubular film Fc. will exercise. Here, one of the front-rear directions along the horizontal direction is called the first direction, and the other is called the second direction.

Further, the folding member 92 moves up and down together with the sealing jaws 90, 90 and the lower gusset forming members 91, 91 as the vertically movable base 20 moves up and down.

After the sealing jaws 90, 90 complete the sealing operation and the cutter separates the upper lateral sealing portion T1 and the lower lateral sealing portion T2 (see FIG. 12), the folding member 92 moves to the forward position shown in FIG. When the folding member 92 reaches the forward position shown in FIG. Due to the folding operation by the folding member 92, the lower lateral seal portion T2 is folded so as to be parallel to the bottom surface portion 52, and the bag 50 becomes a stand pack.

The movement of the folding member 92 shown in FIGS. 14 and 15 subsequent to FIG. 13 will be described in detail later.

(2-2-7) Upper Gusset Forming Member The upper gusset forming members 93,93 are arranged below the sealing jaws 90,90. The upper gusset forming members 93, 93 play a role of forming gussets G1 on the right side and left side of the rectangular tubular film Fc.

The upper gusset forming members 93, 93 are connected to a drive mechanism for moving the lower gusset forming members 91, 91, and reciprocate in the horizontal plane in the left-right direction so as to approach or separate from each other. The upper gusset forming members 93, 93 and the lower gusset forming members 91, 91 are integrally moved by the first air cylinder 91a. Specifically, the upper gusset forming members 93, 93 reciprocate in synchronization with each other at the same cycle, and move symmetrically about the rectangular tubular film Fc conveyed in the vertical direction.

Each upper gusset forming member 93 folds the side portion of the square tube-shaped film Fc inside the square tube-shaped film Fc. As a result, gussets G1 are formed on the right side and left side of the rectangular tubular film Fc (see FIG. 1).

(2-2-8) Vertically Movable Base The vertically movable base 20 plays a role of moving the sealing jaws 90, 90 of the horizontal sealing mechanism 17 up and down, and also serves to move the lower gusset forming members 91, 91 of the bag bottom forming mechanism 19 and the folding mechanism. It is a mount that plays a role of moving the member 92 up and down. As shown in FIG. 6, the vertically movable platform 20 is supported by two rods 12a via sliders 20a so as to be vertically movable. Upper and lower ends of the rod 12a are fixed to the support frame 12. As shown in FIG.

The vertically movable platform 20 is moved vertically by a link/crank mechanism (not shown) and a vertical drive motor 122 . The vertical drive motor 122 is controlled by the control unit 100 to reciprocate the vertically movable frame 20 in the vertical direction, and the horizontal sealing mechanism 17 and the bag bottom forming mechanism 19 mounted on the vertically movable frame 20 are also moved vertically. Move back and forth in direction. That is, the vertical drive motor 122 and the link/crank mechanism (not shown) function as part of the horizontal sealing mechanism 17 and also function as part of the bag bottom forming mechanism 19 .

(2-3) Control Unit The control unit 100 is implemented by a computer. The control unit 100 includes a control arithmetic device and a storage device. A processor, such as a CPU or a GPU, can be used for the control computing unit. The control arithmetic device reads a program stored in the storage device and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic unit can write the arithmetic result to the storage device and read the information stored in the storage device according to the program. FIG. 11 shows various functional blocks implemented by the control arithmetic device. A storage device can be used as a database.

As shown in FIG. 11, the control unit 100 drives the motors and heaters of the film supply unit 6, the transport mechanism 14, the hem forming mechanism 18, the vertical sealing mechanism 15, and the sealing jaws of the horizontal sealing mechanism 17 and bag bottom forming mechanism 19. It is connected to the motor 121, the first air cylinder 91a, the second air cylinder 92a, the vertical drive motor 122, etc., and controls each actuator.

(3) Operation of Bag Making and Packaging Apparatus (3-1) Overall Operation When the conveying mechanism 14 is driven, the film F is unwound from the film roll of the film supply unit 6 and guided to the forming mechanism 13 . In the forming mechanism 13, the sheet-like film F unwound from the film roll advances along the surface of the former 32, and when passing through the gap between the former 32 and the cylindrical member 31, it is pushed outside the upper portion of the cylindrical former 32. It is wrapped around the surface and is gradually formed into a rectangular tubular film Fc as it is conveyed downward.

Subsequently, the rectangular tubular film Fc reaches the hem forming mechanism 18 . In the hem forming units 70 and 71, the rectangular tubular film Fc is creased to form four hem seal portions H1 to H4. After that, the hem-sealed portions H1 to H4 formed in the hem-forming units 70, 71 are heat-sealed when passing through the hem-sealing units 80, 81. FIG.

Further, the vertical sealing mechanism 15, which is positioned at approximately the same height as the hem-sealing units 80, 81, heat-seals the hem-sealing portions H1 to H4 of the rectangular tubular film Fc substantially simultaneously with the hem-sealing units 80, 81. A portion of the tubular film Fc that will be the vertical seal portion L1 is heat-sealed.

Subsequently, the rectangular tubular film Fc passes through the tubular member 31 and descends to the height position of the lateral sealing mechanism 17 and the bag bottom forming mechanism 19 . In the horizontal sealing mechanism 17, a predetermined portion of the rectangular tubular film Fc is heat-sealed in the horizontal direction. At this time, the control unit 100 temporarily stops the transportation of the rectangular tube-shaped film Fc by the transportation mechanism 14 . That is, the controller 100 causes the transport mechanism 14 to intermittently transport the rectangular tubular film Fc.

Prior to heat sealing by the lateral sealing mechanism 17, each of the upper gusset forming members 93, 93 and the lower gusset forming members 91, 91 advances from their respective retracted positions to their respective advanced positions. As a result, the right side portion and the left side portion of the square tube-shaped film Fc are stably folded inside the square tube-shaped film Fc. Further, the right side portion and the left side portion of the square tube-shaped film Fc are folded inside the square tube-shaped film Fc by contact with the lower gusset forming members 91 , 91 .

On the other hand, since the sealing jaws 90, 90 are synchronized with the upper gusset forming members 93, 93 and the lower gusset forming members 91, 91 in forward movement through the cam mechanism, the upper gusset forming members 93, 93 and the lower gusset forming members At the same time that the forming members 91, 91 reach their advanced position, they also reach their advanced position. At the advanced position, the sealing jaws 90, 90 sandwich and heat-seal a predetermined portion of the rectangular tube-shaped film Fc. At this time, a mass of products falls from the computer scale 2 through the cylindrical member 31 and is accumulated in the rectangular cylindrical film Fc. After the sealing operation, the sealing jaws 90, 90 cut the heat-sealed rectangular tubular film Fc at a predetermined portion in the horizontal direction with a built-in cutter in a state in which the product is filled inside. As a result, the preceding bag 50 and the succeeding bag 50 are separated. Of the portions heat-sealed by the sealing jaws 90, 90, the portion on the lower side separated by the cutting operation becomes the upper laterally sealed portion T1 of the preceding bag 50. As shown in FIG. On the other hand, of the portions heat-sealed by the sealing jaws 90, 90, the upper portion separated by the cutting operation becomes the lower laterally sealed portion T2 of the succeeding bag 50. As shown in FIG. The upper gusset forming members 93, 93 and the lower gusset forming members 91, 91 retreat from their forward positions to their retracted positions when the folding operation is finished. On the other hand, the sealing jaws 90, 90 are retracted from the advanced position to the retracted position independently of the upper gusset forming members 93, 93 and the lower gusset forming members 91, 91.

On the other hand, the folding member 92 of the bag bottom surface forming mechanism 19 moves to the advanced position immediately after the front sealing jaw 90 starts to retreat, and the lower lateral sealing portion T2 formed by the sealing jaws 90, 90 is formed into a lower gusset. The bag 50 formed by the members 91, 91 is folded down toward the bottom portion 52 (see FIG. 13).

(3-2) Details of Operation of Folding Members of Bag Bottom Forming Mechanism Referring to FIGS. 12 to 16, folding member 92 folds down lower laterally sealed portion T2 after laterally sealing operation, and subsequent motion of folding member. will be described in detail. The first direction and the second direction shown in FIGS. 12 to 16 are one and the other of the front-rear direction along the horizontal direction, and the conveying direction is the vertically downward direction.

FIG. 12 shows the state when the sealing jaws 90, 90 begin to retreat from the forward position to the retracted position after the lateral sealing operation and the cutting operation by the cutter are finished. When the folding member 92 moves in the first direction from the retracted position shown in FIG. 12 to the advanced position shown in FIG. . Also, the folding member 92 receives heat from the sealing jaw 90 and transfers the heat to the lower lateral sealing portion T2 and the bottom surface portion 52 . As a result, the lower lateral seal portion T2 is fixed to the bottom portion 52, and the bag 50 becomes a stand pack.

Thereafter, the control unit 100 lowers the vertically movable platform 20 to lower the sealing jaws 90 and 90 and the folding member 92, and as shown in FIG. The folding member 92 continues to be moved to the retracted position and begins to move the folding member 92 toward the retracted position in the second direction by the second air cylinder 92a. As a result, the space below the rectangular tubular film Fc in which the bottom surface portion 52 is formed becomes available, so that the controller 100 resumes transporting the rectangular tubular film Fc in the transport direction (downward).

FIG. 15 shows a state in which the sealing jaws 90, 90 and the folding member 92 have reached their retracted positions, and the space below the rectangular tubular film Fc is completely vacated. After that, the control unit 100 raises the vertically movable platform 20, and returns the sealing jaws 90, 90, the lower gusset forming members 91, 91, and the folding member 92 to the horizontal sealing height position (home position shown in FIG. 16). . Then, the horizontal sealing mechanism 17, the bag bottom forming mechanism 19, and the upper gusset forming members 93, 93 repeat the same operations to continue making the bags 50 intermittently.

(4) Adjusting the clearance between the cylindrical member and the lower gusset forming member and sealing jaws The size of the gap between them has a great impact on the aesthetic appearance. If the gap is too small, problems such as damage to the film, pinholes in the film, and interference between parts may occur. Conversely, if the gap is too large, the bottom surface of the bag cannot be formed neatly, and the appearance of the bag deteriorates. In order to prevent such a problem, conventionally, shim adjustment is performed to adjust the height position of the tubular member 31 .

However, it is troublesome to adjust the shims every time the bag size changes and the cylindrical member 31 is replaced with a different size.

Therefore, in the bag making and packaging apparatus 1 according to the present embodiment, the vertically movable base 20 on which the horizontal sealing mechanism 17 and the bag bottom forming mechanism 19 are mounted can be moved up and down. 2, the height positions of the cylindrical member 31, the lower gusset forming members 91, 91, and the sealing jaws 90, 90 are adjusted by a vertical drive motor 122 for moving the vertically movable base 20. As shown in FIG. Although the gap G12 between the lower gusset forming members 91, 91 and the sealing jaws 90, 90 shown in FIG. 10 is constant, the gap G11 between the cylindrical member 31 and the lower gusset forming members 91, 91 shown in FIG. A motor 122 can be used to adjust the dimensions.

When the cylindrical member 31 is replaced with a cylindrical member 31 of another size, the operator adjusts the height using the operation switches 7 or the touch panel type liquid crystal display 8 . Also, when the film F is replaced with a film F having a different thickness or hardness, the operator similarly performs the height adjustment operation and uses the vertical drive motor 122 to adjust the size of the gap G11. .

(5) Features (5-1)
The bag-manufacturing and packaging apparatus 1 of the above-described embodiment is a bag-manufacturing and packaging apparatus 1 that manufactures a bag 50 in which products are packaged. The bag making and packaging apparatus 1 includes a tubular member 31, a former 32, a conveying mechanism 14, a vertical sealing mechanism 15, a hem forming mechanism 18, lower gusset forming members 91, 91 and upper gusset forming members 93, 93, It has a horizontal sealing mechanism 17 , a folding member 92 and a control section 100 . The tubular member 31 is a tubular member in which the product drops. The former 32 is a member for forming the sheet-like film F into a tubular shape. The film F is wound around the tubular member 31 by the former 32 . The conveying mechanism 14 conveys the tubular film F (square tubular film Fc) downstream. The vertical sealing mechanism 15 vertically seals the seams of the rectangular tubular film Fc. The hem forming mechanism 18 and the lower gusset forming members 91, 91 come into contact with the tubular film F from the outside to form the tubular film F into a square tube shape. The lateral sealing mechanism 17 laterally seals the rectangular tubular film Fc to form a lower lateral sealing portion T2. The folding member 92 is a member for folding the lower lateral seal portion T2. As shown in FIG. 13, the control unit 100 moves the folding member 92 in the first direction along the horizontal direction to fold the lower laterally sealed portion T2, and then folds the square tubular film Fc in the conveying direction of the conveying mechanism 14. move member 92;

In the bag-making and packaging apparatus 1, the control section 100 moves the folding member 92 in the conveying direction of the rectangular tube-shaped film Fc after folding the lower lateral seal portion T2 by moving the folding member 92 . As a result, the folding members 92 are less likely to interfere with the conveyance of the square tube-shaped film Fc, compared to the conventional bag making and packaging apparatus in which the folding members 92 do not move in the transportation direction of the square tube-shaped film Fc. I am able to improve my abilities.

(5-2)
In the bag making and packaging apparatus 1 of the above-described embodiment, the control section 100 causes the folding member 92 to fold to the lower laterally sealed portion T2, and then moves the folding member 92 in the conveying direction of the rectangular tube-shaped film Fc. Moving the folding member 92 in a second direction opposite the first direction (see FIGS. 14 and 15). As a result, the folding member 92 can be removed from the space on the downstream side in the conveying direction of the square tube-shaped film Fc at an early stage, and the bag-making capacity can be further enhanced.

(5-3)
The bag-making and packaging apparatus 1 of the above-described embodiment is a bag-making and packaging apparatus that performs so-called intermittent film transport. The control unit 100 moves the folding member 92 in the first direction to fold the lower laterally sealed portion T2 while stopping the transport of the rectangular tube-shaped film Fc by the transport mechanism 14 . Further, after folding the lower laterally-sealed portion T2, the control section 100 moves the folding member 92 in the conveying direction of the square tube-shaped film Fc, and restarts the transportation of the square tube-shaped film Fc by the transport mechanism 14 .

In the conventional bag-manufacturing and packaging apparatus, the conveying of the square tube-shaped film continues to be suspended until the member that folds the lateral seal portion is separated from the conveying path of the square tube-shaped film. Now, by moving the folding member 92 that folds the lower lateral seal portion T2 in the conveying direction of the square tube-shaped film Fc, it is possible to restart the transportation of the square tube-shaped film Fc at an early timing.

(5-4)
In the bag making and packaging apparatus 1 of the above embodiment, the horizontal sealing mechanism 17 has a pair of sealing jaws 90 and 90 and a sealing jaw driving section that drives the pair of sealing jaws 90 and 90 . The sealing jaw driving section has a sealing jaw driving motor 121 fixed to the vertically movable base 20 and a vertical driving motor 122 for vertically moving the vertically movable base 20 . The sealing jaw drive motor 121 moves the pair of sealing jaws 90, 90 along the first direction as shown in FIGS. 13-15. The vertical drive motor 122 moves the pair of sealing jaws 90, 90 along the conveying direction of the rectangular tubular film Fc, as shown in FIGS. The vertical drive motor 122 further moves the folding member 92 in the conveying direction of the rectangular tubular film Fc, as shown in FIGS.

Thus, in the bag making and packaging apparatus 1 of the above-described embodiment, the vertical drive motor 122 not only moves the pair of sealing jaws 90, 90 along the conveying direction, but also functions to move the folding member 92 in the conveying direction. is also responsible. That is, the vertical drive motor 122 serves both to move the pair of sealing jaws 90 , 90 and to move the folding member 92 . As a result, the manufacturing cost of the bag making and packaging apparatus 1 is suppressed.

(5-5)
In the bag making and packaging apparatus 1 of the above-described embodiment, apart from the sealing jaw drive motor 121 that moves the pair of sealing jaws 90, 90 along the first direction, the second air motor that reciprocates the folding member 92 in the first direction is provided. A cylinder 92a is provided. As a result, the movement of the pair of sealing jaws 90, 90 in the first direction and the movement of the folding member 92 in the first direction can be performed at optimum timings without using a complicated link mechanism or the like. is made of. Specifically, each movement operation as shown in FIGS. 12 to 16 can be performed.

(6) Modifications Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention.

(6-1) Modification A
The bag-manufacturing and packaging apparatus 1 of the above-described embodiment is a bag-manufacturing and packaging apparatus that performs so-called intermittent film transport, but the present invention can also be applied to a bag-manufacturing and packaging apparatus that performs so-called continuous film transport. .

Further, when the rectangular tubular film Fc is continuously conveyed, the lowering speed of the seal jaws 90, 90 during continuous bag making should be slightly slower than the conveying speed of the rectangular tubular film Fc in order to flatten the bottom surface of the bag. is preferred.

Conventionally, when making a gusset type bag, there is a process of flattening the bottom surface of the bag. In this step, the bottom surface of the bag is flattened along the shape of the lower end of the tubular member by closing the pair of sealing jaws at a height position as close as possible to the lower end of the tubular member. That is, the bottom surface of the bag is flattened by bringing the height position of the lower end of the tubular member closer to the height position for horizontal movement of the sealing jaws to reduce the gap between the two. However, this conventional method is based on the premise that the transport of the rectangular tubular film is stopped when the pair of sealing jaws is closed. In continuous bag making, in which square tube-shaped film is continuously fed, in order to avoid film clogging due to interference between the sealing jaws and the film, when closing a pair of sealing jaws, the It is necessary to move the sealing jaws in the conveying direction. As a result, the height position of the sealing jaws at the time of lateral sealing is separated from the lower end of the tubular member, and the bottom surface of the bag cannot be formed flat.

As a method for solving such a problem, it is effective to make the lowering speed of the sealing jaws 90, 90 in continuous bag making slightly slower than the conveying speed of the rectangular tubular film Fc. If the lowering speed of the sealing jaws 90, 90 is set to be slightly slower than the conveying speed of the square tube-shaped film Fc, the bottom surface of the square tube-shaped film Fc will form a pair of seals as shown in FIGS. The lower part of the rectangular tubular film Fc is loosened by being pressed against the upper surfaces of the jaws 90, 90 (see FIG. 18). Then, the lower surface of the rectangular tube-shaped film Fc pressed against the upper surface of the sealing jaw receives heat from the sealing jaw and forms a flat bottom surface of the bag. By setting the lowering speed of the sealing jaws 90, 90 to a speed slightly lower than the conveying speed of the rectangular tubular film Fc in this manner, the bottom surface of the gusset type bag is formed flat even in continuous bag making. be able to. As a result, the bag-making capacity for gusset-type bags can be increased, and an improvement in productivity can be expected.

(6-2) Modification B
As described in the description of Modification A above, conventionally, in a bag making and packaging apparatus that intermittently conveys a film, a pair of sealing jaws are closed at a height position as close to the lower end of the tubular member as possible, thereby closing the tubular member. The bottom surface of the bag is flattened along the shape of the lower end of the member.

In addition, the pair of sealing jaws must be closed at a slow speed in order to avoid tucking or wrinkling at the lateral sealing portion.

However, if the closing speed of the pair of sealing jaws is slowed down, the film may be jammed unless the height of the sealing jaws at the start of lateral sealing is lowered accordingly. For this reason, the pair of sealing jaws must be closed at a certain speed, sacrificing the appearance of the bag.

In order to achieve both the contradictory requirements of preventing film clogging and aesthetic appearance of the bag, it is necessary to determine the optimum height position of the sealing jaws at the start of horizontal sealing. Calculating this automatically is the function of the bag making and packaging apparatus of Modification B. FIG.

In the bag making and packaging apparatus of Modification B, the time required for the pair of sealing jaws to close is set, and the film transport speed, the time taken to reach the film in the process of closing the sealing jaws, etc. are used to automatically , to calculate the optimum sealing jaw height position at the start of lateral sealing. That is, in the bag making and packaging apparatus of Modification B, when the operator adjusts the speed at which the pair of sealing jaws is closed, the optimum height position of the sealing jaws at the start of horizontal sealing is determined accordingly. Automatic control is provided to initiate lateral sealing at position. As a result, in the bag-making and packaging apparatus of Modification B, the appearance of the bag can be maintained without clogging the film.

(6-3) Modification C
In the above embodiment, as shown in FIG. 11, the vertical drive motor 122 and the link/crank mechanism for vertically moving the vertically movable platform 20 serve to vertically move the sealing jaws 90, 90 of the horizontal sealing mechanism 17. , the lower gusset forming members 91, 91 and the upper gusset forming members 93, 93 and the folding member 92 of the bag bottom forming mechanism 19 are moved up and down.

However, instead of such a configuration, a servo motor or an air cylinder for moving the folding member 92 in the conveying direction may be provided separately from the vertical drive motor 122 or the like for vertically moving the sealing jaws 90, 90 and the lower gusset forming members 91, 91. may be provided.

(6-4) Modification D
In the above embodiment, the hem forming mechanism 18, the lower gusset forming members 91, 91, and the upper gusset forming members 93, 93 are in contact with the cylindrical film F from the outside to form the film F into a square tube shape. The member for forming the rectangular tubular film Fc may be one of these members, or may be another member different from these members. For example, deployment of the hem forming mechanism 18 may be omitted.

(6-5) Modification E
In the above-described embodiment, after the lower lateral seal region T2 is folded down by the folding member 92, the control unit 100 lowers the sealing jaws 90 and the folding member 92 as shown in FIG. is beginning to move in the second direction toward the retracted position.

However, it is not necessary to immediately start moving the folding member 92 in the second direction depending on the conveying speed of the rectangular tube-shaped film Fc and the necessary restart timing of conveying. After the vertically movable platform 20 on which the folding member 92 is mounted has finished descending, the folding member 92 may be moved in the second direction and returned to the retracted position.

REFERENCE SIGNS LIST 1 bag making and packaging apparatus 14 conveying mechanism 15 vertical sealing mechanism 17 horizontal sealing mechanism 18 hem forming mechanism 31 cylindrical member 32 former 90 sealing jaw 91 lower gusset forming member (first member)
91a first air cylinder 92 folding member (second member)
92a second air cylinder 93 upper gusset forming member (first member)
100 control unit 121 seal jaw drive motor (first drive unit)
122 vertical drive motor (second drive unit)
T2 Lower horizontal seal area (lateral seal area)

Japanese Patent No. 3922928

Claims (6)

A bag making and packaging device for manufacturing a bag in which a product is packaged,
a cylindrical member in which the product falls;
a former for winding the packaging material around the tubular member to form the sheet-like packaging material into a tubular shape;
a conveying mechanism for conveying the cylindrical packaging material downstream;
a vertical sealing mechanism for vertically sealing seams of the cylindrical packaging material;
a first member that is in contact with the tubular packaging material from the outside and forms the tubular packaging material into a rectangular tubular shape;
a horizontal sealing mechanism that laterally seals the rectangular tube-shaped packaging material and forms a horizontal sealing portion in the packaging material;
a second member for folding the lateral seal portion;
a control unit;
with
The control unit moves the second member in a direction in which the packaging material is conveyed by the conveying mechanism after the horizontal seal portion is folded by moving the second member in a first direction.
Bag making and packaging equipment. After folding the horizontal seal portion, the control unit moves the second member in the conveying direction of the packaging material and also moves the second member in a second direction opposite to the first direction.
The bag making and packaging apparatus according to claim 1. The control unit moves the second member in the first direction to fold the lateral seal portion in a state in which the transport of the packaging material by the transport mechanism is stopped, folds the lateral seal portion, and then folds the package. moving the second member in the material conveying direction to restart the conveying of the packaging material by the conveying mechanism;
The bag making and packaging apparatus according to claim 1 or 2. The horizontal sealing mechanism includes a first sealing jaw and a second sealing jaw that are arranged to face each other with the cylindrical packaging material sandwiched therebetween, and a sealing jaw drive section that drives the first sealing jaw and the second sealing jaw. have
The sealing jaw driving section includes a first driving section that moves the first sealing jaw and the second sealing jaw along the first direction, and a first driving section that moves the first sealing jaw and the second sealing jaw in the packaging material. a second driving unit for moving along the conveying direction,
The second drive unit further moves the second member along the transport direction of the packaging material,
The bag making and packaging apparatus according to any one of claims 1 to 3. a third drive unit, separate from the first drive unit, for moving the second member in the first direction;
The bag making and packaging apparatus according to claim 4, further comprising: The first direction is a direction along the horizontal direction,
The conveying direction of the packaging material by the conveying mechanism is a vertically downward direction,
The bag making and packaging apparatus according to any one of claims 1 to 5.

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