WO2015190370A1 - Bag-making and packaging machine - Google Patents

Abstract

Provided is a highly reliable bag-making and packaging machine which has a simple configuration and is capable of making make bags of various sizes, and which can suppress the occurrence of malfunctions such as meandering of film. This bag-making and packaging machine is provided with a shaping mechanism (20) for bending a strip of film such that a left end and a right end overlap, thus shaping a cylindrical film. The shaping mechanism has a main body (21) and an overlap formation section (50). The main body has bending edges (31, 41) and curved surface formation sections (32, 42). The curved surface formation sections are arranged on an upstream side of a conveyance direction of the strip of film relative to the bending edges which bend the strip of film to shape the cylindrical film, and guide the strip of film toward the bending edges. The overlap formation section is a separate member from the main body, and nips a part of the cylindrical film shaped into a cylinder by being bent with the bending edges, to form an overlap portion of the cylindrical film. The main body is divided into a left main body (30) and a right main body (40) and is configured so as to allow for adjustment of the positions of the left main body and right main body in the left-right direction.

Description

Bag making and packaging machine

The present invention relates to a bag making and packaging machine provided with a forming mechanism for forming a belt-like film into a cylindrical film.

A belt-shaped packaging film is formed into a cylindrical film so that the ends overlap with each other by a molding mechanism, the overlapping portions of the cylindrical film are vertically sealed, and further sealed in the lateral direction, thereby forming a packaging bag. A bag making and packaging machine is known.

Such a bag making and packaging machine may be required not only to handle single size bag making but also to handle various size bag making.

In order to handle various bag sizes with a single bag making and packaging machine, it is necessary to change the shape of the forming mechanism for forming the bag according to the bag size. Therefore, in the conventional bag making and packaging machine, the forming mechanism is exchanged in accordance with the size of the bag to be made.

However, when exchanging the molding mechanism according to the bag size, it takes time to exchange the molding mechanism every time the bag size is changed, and it is difficult to maintain high production efficiency. Moreover, since it is necessary to prepare a separate molding mechanism in accordance with the size of the bag, the manufacturing cost of the bag making and packaging machine becomes high.

For such a problem, Patent Document 1 (Japanese Patent Laid-Open No. 11-130007) discloses a molding mechanism that can change the size of a bag to be manufactured. In Patent Document 1 (Japanese Patent Laid-Open No. 11-130007), an elastic member forming a loop for forming a belt-like film into a cylindrical shape is composed of two plate pieces, and both plate pieces are matched to the size of the bag. A configuration is described in which the loop is contracted / expanded while maintaining a perfect circular shape by bringing one end portion close / separated.

However, the molding mechanism of Patent Document 1 (Japanese Patent Laid-Open No. 11-130007) has a very complicated structure, and a great deal of labor is required for its assembly. In addition, in order to form a belt-like film into a cylindrical shape without causing abnormalities such as meandering and wrinkles of the film, it is important to realize a curve called a bending curve with high accuracy in the forming mechanism. In order to maintain the perfect circular shape by elastically deforming the plate piece, highly accurate processing and assembly are required. In particular, when trying to deal with a wide range of bags, it may be difficult to deal with the configuration of Patent Document 1 (Japanese Patent Laid-Open No. 11-130007).

An object of the present invention is to provide a highly reliable bag making and packaging machine that can realize bag making of bags of various sizes with a simple configuration and can suppress the occurrence of abnormalities such as film meandering. .

The bag making and packaging machine according to the first aspect of the present invention includes a forming mechanism, a vertical sealing mechanism, and a horizontal sealing mechanism. The forming mechanism forms the tubular film by bending the belt-like film in the width direction extending in the left-right direction so that the left end and the right end of the belt-like film overlap each other. The vertical seal mechanism vertically seals the overlapping portions of the tubular film. The lateral seal mechanism laterally seals the vertically sealed tubular film. The forming mechanism has a main body and an overlap forming portion. The main body has a bending edge portion and a curved surface forming portion. The bending edge portion bends the belt-like film to form a tubular film. The curved surface forming part is disposed upstream of the bending edge in the transport direction of the belt-like film, and guides the belt-like film to the bending edge. The overlap forming part is a separate member from the main body. The overlap forming portion sandwiches a part of the cylindrical film that is bent at the bending edge and formed into a cylindrical shape, and forms an overlapping portion of the cylindrical film. The main body is divided into a left main body disposed on the left side and a right main body disposed on the right side, and is configured to be capable of adjusting the position of at least one of the right main body and the left main body in the horizontal direction.

In the bag making and packaging machine according to the first aspect, the main body is divided into a left main body and a right main body, and the left and / or right main body can be adjusted in the left-right direction, thereby changing the shape of the bending curve. It is possible to cope with a change in the size of the bag without using a complicated mechanism. Also, since the shape of the bending edge itself does not change here, it is easy to realize bag making in various size ranges without causing abnormalities such as film meandering, and highly reliable bag making packaging. Machine can be provided.

Here, since the overlap forming part is a separate member from the main body, the position of the overlap forming part can be adjusted independently of the main body, and the molding mechanism is always optimally configured according to bag making conditions. Is easy. Furthermore, since the overlap forming portion is a separate member from the main body here, it is also easy to change the overlap forming portion and change the form of the overlapping portion (back seal) of the cylindrical film that is vertically sealed.

The bag making and packaging machine according to the second aspect of the present invention is the bag making and packaging machine according to the first aspect, and the forming mechanism further includes a position adjusting mechanism for adjusting the position of the overlap forming portion.

In the bag making and packaging machine according to the second aspect, since the forming mechanism further includes the position adjusting mechanism of the overlap forming portion, the position of the overlap forming portion can be determined without preparing another overlap forming portion for each position of the overlap forming portion. It is possible to adjust to an appropriate position where no abnormality such as a meandering film occurs.

The bag making and packaging machine according to the third aspect of the present invention is the bag making and packaging machine according to the second aspect, and the position adjusting mechanism adjusts the height position of the overlap forming portion.

The bag making and packaging machine according to the fourth aspect of the present invention is the bag making and packaging machine according to the second aspect or the third aspect, in which an article to be packaged supplied to the tubular film from above the bag making and packaging machine is provided. A tube passing through the inside is further provided. The tube is disposed between the left body and the right body so as to be surrounded by a bending edge.

In the bag making and packaging machine according to the fourth aspect, since the tube for supplying the packaged object is arranged inside the main body, it is easy to guide the packaged object into the cylindrical film.

The bag making and packaging machine according to the fifth aspect of the present invention is the bag making and packaging machine according to the fourth aspect, and the tube is removable from the bag making and packaging machine independently of the forming mechanism. Position adjustment in the left-right direction of the right main body and / or the left main body is performed according to the size of the tube.

In the bag making and packaging machine according to the fifth aspect, since the tube can be removed independently of the forming mechanism, the maintenance is performed by removing only the tube that is in contact with the package and requires maintenance such as cleaning. And maintainability of the device is high. Moreover, it is easy to change a tube according to the size change of a bag.

The bag making and packaging machine according to the sixth aspect of the present invention is the bag making and packaging machine according to any one of the first to fifth aspects, further comprising a base plate to which the main body and the overlap forming portion are attached. The overlap forming part can be detached from the base plate independently of the main body.

In the bag making and packaging machine according to the sixth aspect, since only the overlap forming part can be removed from the base plate without removing the main body, the overlap forming part can be easily replaced according to the shape of the vertical seal of the bag. .

The bag making and packaging machine according to the seventh aspect of the present invention is the bag making and packaging machine according to any one of the first to sixth aspects, and the forming mechanism further includes a guide. A guide is arrange | positioned so that between a left main body and a right main body may be connected, and the conveyance path | route of a cylindrical film is supported.

In the bag making and packaging machine according to the seventh aspect, since the portion of the cylindrical film transport path that is not directly supported by the main body is supported by the guide, it is further easier to suppress abnormalities such as meandering of the film.

A bag making and packaging machine according to an eighth aspect of the present invention is the bag making and packaging machine according to any one of the first to seventh aspects, wherein the bending edge part is a first part that forms a curved part of a tubular film. And a second curve forming portion and first and second linear forming portions for forming a straight portion of the tubular film. The left main body includes a first curve forming portion and a first linear forming portion extending from the end of the first curve forming portion toward the right main body. The right main body includes a second curve forming portion and a second straight line forming portion extending from the end of the second curve forming portion toward the left main body.

In the bag making and packaging machine according to the eighth aspect, since each of the left main body and the right main body has a linear forming portion that extends linearly toward the other, it is a case of forming a large size bag, etc. However, it is easy to precisely form the shape of the straight portion of the bag.

In the bag making and packaging machine according to the present invention, the main body is divided into the left main body and the right main body, and the left and / or right main body can be adjusted in the left-right direction, thereby changing the shape of the bending curve. The size of the bag can be changed without using a complicated mechanism. Also, since the shape of the bending edge itself does not change here, it is easy to realize bag making in various size ranges without causing abnormalities such as film meandering, and highly reliable bag making packaging. Machine can be provided. Here, since the overlap forming part is a separate member from the main body, the position of the overlap forming part can be adjusted independently of the main body, and the molding mechanism is always optimally configured according to bag making conditions. Is easy. Furthermore, since the overlap forming portion is a separate member from the main body here, it is also easy to change the overlap forming portion and change the form of the overlapping portion (back seal) of the cylindrical film that is vertically sealed.

It is a perspective view of the measurement packaging apparatus containing the bag making packaging machine which concerns on one Embodiment of this invention. It is a perspective view which shows schematic structure of the bag making packaging unit of the bag making packaging machine which concerns on FIG. FIG. 3 is a perspective view of the forming mechanism and lower tube periphery of the bag making and packaging unit according to FIG. 2. It is a figure which shows the state which removed the overlap formation part and the lower tube from the bag making packaging unit which concerns on FIG. It is a perspective view of the shaping | molding mechanism of the bag making packaging unit which concerns on FIG. In FIG. 5, the state where the right main body is removed is drawn (the right main body is drawn with a two-dot chain line). It is the top view which looked at the 1st and 2nd bending edge part vicinity of the shaping | molding mechanism of the bag making packaging unit which concerns on FIG. 3 from upper direction. In FIG. 6, the state where the right main body is removed is drawn (the right main body is drawn with a two-dot chain line). FIG. 7 is a schematic plan view of a state where an overlapping portion of a tubular film is formed from above in the overlapping portion according to FIG. 6. The periphery of the overlapping part is enlarged and drawn. It is a perspective view of the overlap formation part of the bag making packaging unit which concerns on FIG. It is sectional drawing which cut | disconnected the bag made by the bag making packaging unit which concerns on FIG. 3 in the horizontal seal direction. The vertical seal portion of the bag is actually heat-sealed, but here, the bag is drawn with a gap between the films of the vertical seal portion. It is sectional drawing which cut | disconnected the bag of the shape which concerns on the other Example produced by a bag making packaging machine in the horizontal seal direction. The vertical seal portion of the bag is actually heat-sealed, but here, the bag is drawn with a gap between the films of the vertical seal portion. (A) is sectional drawing of the bag of the shape which overlaps in the state which the inner surface of the one end and the inner surface of the other end of the film oppose. (B) is sectional drawing of the bag of the shape where the vertical seal position shifted | deviated from the center of the left-right direction to the right side. It is the top view which looked at the 1st and 2nd bending edge vicinity of the forming mechanism of the bag making packaging unit concerning modification F from the upper part. In FIG. 11, the state where the right main body is removed is drawn (the right main body is drawn with a two-dot chain line). FIG. 12 is a perspective view of a forming mechanism and a divided tube according to Modification H.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Overall Configuration FIG. 1 is a perspective view of a weighing and packaging apparatus 1 including a bag making and packaging machine 3 according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit 3 a included in the bag making and packaging machine 3.

The weighing and packaging apparatus 1 has a combination weighing machine 2 and a bag making and packaging machine 3 (see FIG. 1). The bag making and packaging machine 3 includes a bag making and packaging unit 3a and a film supply unit 3b (see FIG. 1).

The combination weighing machine 2 is arranged above the bag making and packaging unit 3a. In the combination weighing machine 2, the weight of the article C (package) is weighed by a plurality of weighing hoppers, and these weights are combined so as to have a predetermined total weight. Are discharged downward from the central opening of the collective discharge chute 2a (see FIG. 1).

The bag making and packaging unit 3a of the bag making and packaging machine 3 performs bagging of the article C in accordance with the timing at which the article C is supplied from the combination weighing machine 2. The film supply unit 3b supplies the packaging film (strip film F) to be the bag B to the bag making and packaging unit 3a.

The weighing and packaging apparatus 1 is provided with an operation switch 4 for operating the weighing and packaging apparatus 1 (see FIG. 1). In addition, the weighing and packaging apparatus 1 is provided with a touch panel type display 5 that displays an operation state of the weighing and packaging apparatus 1 and receives input of various settings to the weighing and packaging apparatus 1 (see FIG. 1). The operation switch 4 and the touch panel display 5 function as an input unit that receives instructions for the combination weighing machine 2 and the bag making and packaging machine 3 and settings related to the combination weighing machine 2 and the bag making and packaging machine 3. The touch panel display 5 functions as an output unit that displays information related to the combination weighing machine 2 and the bag making and packaging machine 3. In this embodiment, the operation switch 4 and the touch panel display 5 are shared by the combination weighing machine 2 and the bag making and packaging machine 3, but the present invention is not limited to this. May be provided.

The operation switch 4 and the touch panel display 5 are connected to a control unit (not shown) including a CPU, a ROM, a RAM, and the like. Each configuration of the combination weighing machine 2 and the bag making and packaging machine 3 is controlled by a control unit (not shown) in accordance with operations and settings input from the operation switch 4 and the touch panel display 5. The control unit takes in necessary information from various sensors (not shown) installed in the combination weighing machine 2 and the bag making and packaging machine 3 and uses the information to configure the combination weighing machine 2 and the bag making and packaging machine 3. Control. In this embodiment, the control unit controls both the combination weighing machine 2 and the bag making and packaging machine 3. However, the control unit is not limited to this, and for each of the combination weighing machine 2 and the bag making and packaging machine 3. Another control unit may be provided.

(2) Detailed configuration Details of the bag making and packaging unit 3a and the film supply unit 3b of the bag making and packaging machine 3 will be described.

In the following description, expressions such as “front (front)”, “rear (back)”, “up”, “down”, “left”, “right”, etc. may be used to express the direction. Here, “front”, “rear”, “upper”, “lower”, “left”, and “right” are defined as shown in FIGS. Unless otherwise specified, expressions such as “front”, “rear”, “upper”, “lower”, “left”, “right” and the like are used according to the definitions in FIGS. Note that “front”, “rear”, “upper”, “lower”, “left”, “right” in FIG. 2 and “front”, “rear”, “upper”, “lower”, “lower”, “ “Left” and “right” indicate the same direction. In addition, the expressions “upstream” and “downstream” may be used, but “upstream” and “downstream” are based on the transport direction of the film (the strip film F and the cylindrical film Fc).

(2-1) Bag making and packaging unit The bag making and packaging unit 3a will be described below.

The bag making and packaging unit 3a mainly includes a funnel member 11, an upper tube 12, a forming mechanism 20, a lower tube 60, a pull-down belt mechanism 13, a vertical sealing mechanism 14, and a horizontal sealing mechanism 15. (See FIG. 2).

The funnel member 11 receives the article C discharged from the combination weighing machine 2 and guides it to the upper tube 12. The article C supplied to the upper tube 12 is delivered to the lower tube 60 connected to the upper tube 12. The forming mechanism 20 forms the sheet-like belt-like film F conveyed from the film supply unit 3b into a cylindrical shape. The pull-down belt mechanism 13 conveys a tubular film (hereinafter referred to as a tubular film Fc) downward. The vertical sealing mechanism 14 seals the overlapping portion A (joint) of the tubular film Fc in the vertical direction. The horizontal sealing mechanism 15 seals the tubular film Fc transported downward in the lateral direction, in other words, along the direction intersecting the transport direction with the tubular film Fc transported downward. By sealing, the upper and lower ends of the bag B are sealed.

(2-1-1) Funnel Member The funnel member 11 is a cylindrical member whose upper opening area is larger than the lower opening area (see FIG. 2). The funnel member 11 receives the article C which is weighed by the combination weighing machine 2 and falls from the central opening of the collective discharge chute 2a from the upper opening. The article C introduced from the upper opening of the funnel member 11 falls from the lower opening of the funnel member 11 to the internal space of the upper tube 12 below the funnel member 11.

(2-1-2) Upper Tube The upper tube 12 receives the article C from the funnel member 11 and delivers the article C to the lower tube 60 below. The upper tube 12 is a cylindrical member.

The article C discharged from the combination weighing machine 2 and guided to the funnel member 11 and falling from above continues to fall through the inside of the upper tube 12. The upper end of the upper tube 12 is connected to the lower end of the funnel member 11 (see FIG. 2). That is, the internal space of the upper tube 12 communicates with the internal space of the funnel member 11. Further, the lower end of the upper tube 12 is connected to the upper end of the lower tube 60 (see FIG. 2). That is, the internal space of the upper tube 12 communicates with the internal space of the lower tube 60.

(2-1-3) Forming Mechanism The forming mechanism 20 forms the tubular film F by bending the strip film F in the width direction extending in the left-right direction so that the left end portion and the right end portion of the strip film F overlap each other. . The tubular film Fc has substantially the same cross-sectional shape as a tubular portion 61 of the lower tube 60 described later. Specifically, when the cylindrical film Fc is cut in a cross section perpendicular to the direction of vertical sealing by a vertical sealing mechanism 14 described later and viewed from above, the front surface extending linearly is opposed to the front surface. And a left side surface and a right side surface formed in a substantially arc shape.

The forming mechanism 20 mainly includes a main body 21, a main body position adjusting mechanism 80, an overlap forming portion 50, and a vertical position adjusting mechanism 55 (see FIG. 3).

(2-1-3-1) Main Body The main body 21 has a left main body 30 disposed on the left side and a right main body 40 disposed on the right side (see FIG. 3). The main body 21 is divided into a left main body 30 and a right main body 40 (see FIG. 4). The left main body 30 and the right main body 40 are formed symmetrically (see FIG. 4).

The main body 21 is disposed on a base plate 100 (see FIG. 3) fixed to the frame of the bag making and packaging machine 3 (not shown). Specifically, the left main body 30 is disposed on a movable plate 71 disposed on the base plate 100, and the right main body 40 is disposed on a movable plate 72 disposed on the base plate 100 (see FIG. 5). The right main body 40 is positioned with respect to the movable plate 72 by inserting a plurality of pins 76 protruding upward from the movable plate 72 into holes formed in the lower surface of the right main body 40, and the movable plate 72 is moved by the pneumatic clamp 75. 72 (see FIG. 5). Although not shown, the left main body 30 is also positioned with respect to the movable plate 71 by a pin 76 and is fixed to the movable plate 71 by a pneumatic clamp 75. However, the fixing method of the left main body 30 and the movable plate 71 and the fixing method of the right main body 40 and the movable plate 72 are exemplifications, and various well-known fixing methods (for example, hydraulic clamping, fixing with screws, etc.) are used. May be. However, by using a pneumatic clamp or a hydraulic clamp, the left main body 30 and the right main body 40 can be easily attached / detached to / from the movable plates 71 and 72 rather than using screws or the like.

The movable plate 71 engages with two rails 73 extending in the left-right direction, and is slidably supported on the rails 73 (see FIG. 5). The two rails 73 are arranged on the front side and the rear side of the base plate 100 so as to extend in parallel to each other. The movable plate 72 engages with two rails 74 extending in the left-right direction and is slidably supported on the rails 74 (see FIG. 5). The two rails 74 are arranged on the front side and the rear side of the base plate 100 so as to extend in parallel to each other.

The movable plate 71 and the movable plate 72 are configured to be position-adjustable along a rail 73 and a rail 74 so as to approach each other or away from each other by a main body position adjusting mechanism 80 described later. Yes. In other words, the position of the right main body 40 and the left main body 30 can be adjusted in the left-right direction so that the positions of the movable plate 71 and the movable plate 72 are adjusted so as to approach each other or away from each other. It is configured. That is, the positions of the right main body 40 and the left main body 30 are adjusted in the left-right direction by the main body position adjusting mechanism 80.

The left main body 30 mainly has a first bending edge portion 31 and a first curved surface forming portion 32 (see FIG. 4). The right main body 40 mainly includes a second bending edge portion 41 and a second curved surface forming portion 42 (see FIG. 4). The first bending edge 31 and the second bending edge 41 constitute a bending curve. The first bending edge 31 and the second bending edge 41 are portions that bend the belt-like film F to form the tubular film Fc.

The first bending edge portion 31 is an edge portion that serves as a boundary between a right curved surface 30a of the left main body 30 facing the lower tube 60 described later and a curved surface portion 32b of the first curved surface forming portion 32 described later (FIG. 5). reference). The second bending edge portion 41 is an edge portion that serves as a boundary between a left curved surface 40a of the right main body 40 facing the lower tube 60 described later and a curved surface portion 42b of the second curved surface forming portion 42 described later (FIG. 5). reference).

The first bending edge 31 is formed so as to be lowered from the rear end 31c toward the front end 31d (see FIG. 5). The first bending edge portion 31 is formed so as to proceed to the left side from the rear end portion 31c toward the intermediate portion of the first bending edge portion 31 when viewed from above (see FIG. 6). Further, the first bending edge 31 is formed so as to proceed to the right side from the intermediate part of the first bending edge 31 toward the front end 31d when viewed from above (see FIG. 6). The first bending edge 31 is generally U-shaped so as to protrude to the left when viewed from above (see FIG. 6). The 1st bending edge part 31 contains the 1st curve shaping | molding part 31a and the 1st linear shaping | molding part 31b (refer FIG. 6). The first curve forming portion 31a is formed in a curved shape (substantially arc shape) when viewed from above (see FIG. 6). The first curve forming portion 31a mainly shapes the curved portion of the tubular film Fc, specifically, the left side surface of the tubular film Fc. When viewed from above, the first linear forming portion 31b is a portion that linearly extends from the front end portion 31d and the rear end portion 31c of the first curve forming portion 31a toward the right main body 40, in other words, to the right. (See FIG. 6). The first linear forming part 31b mainly forms the linear part of the tubular film Fc, specifically, the left part of the front surface and the rear surface of the tubular film Fc.

The second bending edge 41 is formed so as to become lower from the rear end 41c toward the front end 41d (see FIG. 5). The second bending edge portion 41 is formed so as to proceed to the right side from the rear end portion 41c toward the intermediate portion of the second bending edge portion 41 when viewed from above (see FIG. 6). Further, the second bending edge portion 41 is formed so as to proceed to the left from the intermediate portion of the second bending edge portion 41 toward the front end portion 41d when viewed from above (see FIG. 6). The second bending edge portion 41 is generally U-shaped so as to protrude rightward when viewed from above (see FIG. 6). The first bending edge 31 and the second bending edge 41 are formed symmetrically (see FIGS. 5 and 6). The second bending edge portion 41 includes a second curve forming portion 41a and a second linear forming portion 41b (see FIG. 6). The second curve forming portion 41a is formed in a curved shape (substantially arc shape) when viewed from above (see FIG. 6). The second curve forming portion 41a mainly shapes the curved portion of the tubular film Fc, specifically, the right side surface of the tubular film Fc. When viewed from above, the second linear forming portion 41b is a portion that linearly extends from the front end portion 41d and the rear end portion 41c of the second curved shape forming portion 41a toward the left main body 30, in other words, to the left. (See FIG. 6). The second linear forming portion 41b mainly shapes the linear portion of the tubular film Fc, specifically, the right portion of the front surface and the rear surface of the tubular film Fc.

In addition, on the extension line of each 2nd linear shaping | molding part 41b extended in the left direction from the front and back edge part of the 2nd curve shaping | molding part 41a, it is rightward from the front and back edge part of the 1st curve shaping | molding part 31a, respectively. The 1st linear shaping | molding part 31b extended in this is arrange | positioned. That is, each second linear forming portion 41b extending leftward from the front and rear ends of the second curve forming portion 41a is viewed from the front and rear ends of the first curve forming portion 31a when viewed from above. It arrange | positions on the 1st linear shaping | molding part 31b extended in the right direction, and a straight line.

The first bending edge 31 is a state in which the left main body 30 and the right main body 40 are brought close to each other (the rear end 31c of the first bending edge 31 and the rear end 41c of the second bending edge 41 are brought close to each other). In the state), it is formed in a V shape so that the lower side becomes narrower when viewed from the front side.

In addition, the left main body 30 and the right main body 40 are disposed so that the first bending edge 31 and the second bending edge 41 surround the lower tube 60 (see FIG. 3). In particular, the left main body 30 is disposed such that the first bending edge 31 surrounds the left side surface of the lower tube 60 (see FIG. 3). The right main body 40 is disposed such that the second bending edge 41 surrounds the right side surface of the lower tube 60 (see FIG. 3). The 1st bending edge part 31 and the 2nd bending edge part 41 guide so that the strip | belt-shaped film F may be wound around the outer surface of the cylindrical part 61 of the lower tube 60 mentioned later. The bending edges (the first bending edge 31 and the second bending edge 41) bend the belt-like film F to form the tubular film Fc.

The left main body 30 has a first curved surface forming portion 32 at the top thereof (see FIG. 5). The first curved surface forming portion 32 is disposed on the upstream side in the transport direction of the strip film F with respect to the first bending edge portion 31, and guides the strip film F to the first bending edge portion 31. The 1st curved surface formation part 32 has the slope part 32a formed so that it might become high gradually toward the front from the edge part of the rear side of the left main body 30 (refer FIG. 5). The slope portion 32 a is highest near the rear end portion 31 c of the first bending edge portion 31. The first curved surface forming portion 32 further includes a curved surface portion 32b that is continuous with the slope portion 32a and is formed so as to surround the first bending edge portion 31 (see FIG. 5). The curved surface portion 32b is outwardly viewed from the space surrounded by the left main body 30 and the right main body 40 and in which the lower tube 60 is disposed (so as to move away from the space surrounded by the left main body 30 and the right main body 40). ) Projecting curved surface.

The right main body 40 has a second curved surface forming portion 42 at the top thereof (see FIG. 5). The second curved surface forming portion 42 is disposed upstream of the second bending edge 41 in the transport direction of the strip film F, and guides the strip film F to the second bending edge 41. The 2nd curved surface formation part 42 has the slope part 42a formed so that it might become high gradually toward the front from the edge part of the back side of the right main body 40 (refer FIG. 5). The slope 42 a is highest near the rear end 41 c of the second bending edge 41. The second curved surface forming portion 42 further includes a curved surface portion 42b that is continuous with the inclined surface portion 42a and is formed so as to surround the second bending edge portion 41 (see FIG. 5). The curved surface portion 42b is outwardly viewed from the space surrounded by the left main body 30 and the right main body 40 and in which the lower tube 60 is disposed (so as to move away from the space surrounded by the left main body 30 and the right main body 40). ) Projecting curved surface.

The belt-like film F is conveyed obliquely upward along the inclined surface portion 32a and the inclined surface portion 42a while contacting the inclined surface portion 42a to the inclined surface portion 32a and the second curved surface forming portion 42 of the first curved surface forming portion 32. The belt-like film F is folded back in the vicinity where the inclined surface portion 32a and the inclined surface portion 42a are switched to the curved surface portion 32b and the curved surface portion 42b, respectively, and the first bending edge portion 31 and the second bending edge portion 41 are used to It forms in the cylindrical film Fc so that it may wind around the outer surface of the cylindrical part 61. FIG. The tubular film Fc is conveyed through the gap between the first bending edge 31 and the second bending edge 41 and the lower tube 60.

(2-1-3-2) Main Body Position Adjustment Mechanism The main body position adjustment mechanism 80 positions the movable plate 71 fixed to the left main body 30 and the movable plate 72 fixed to the right main body 40 in the left-right direction. It is a mechanism for adjusting.

The main body position adjusting mechanism 80 mainly includes a feed screw 81 and a handle 82 (see FIG. 5). The feed screw 81 is formed with a male screw (not shown). A trapezoidal screw is used as the feed screw 81. The feed screw 81 is engaged with the movable plate 71 and the movable plate 72 by the male screw of the feed screw 81 being screwed into a female screw (not shown) formed on the movable plate 71 and the movable plate 72. It should be noted that the threading of the male screw of the feed screw 81 that engages with the female screw of the movable plate 71 and the part of the movable screw 72 that meshes with the female screw are reversed. That is, one of the male screw of the feed screw 81 that meshes with the female screw of the movable plate 71 and the portion that meshes with the female screw of the movable plate 72 are right-handed screws and the other is a left-handed screw. The handle 82 is connected to the feed screw 81. When the handle 82 is rotated, the feed screw 81 is rotated, and the movable plate 71 is moved along the rail 73 and the movable plate 72 is moved along the rail 74 so as to approach each other or away from each other. Move left and right. As a result, the left and right positions of the left main body 30 on the movable plate 71 and the right main body 40 on the movable plate 72 are adjusted.

The position adjustment of the left main body 30 and the right main body 40 by the main body position adjusting mechanism 80 is performed, for example, when the belt-like film F that uses the bag B for bag making is replaced. Specifically, for example, when the bag B to be made is large and the width in the left-right direction of the belt-like film F is large, the position adjustment of the left main body 30 and the right main body 40 by the main body position adjusting mechanism 80 is performed. In addition, when the width | variety of the left-right direction of the strip | belt-shaped film F becomes large, it arrange | positions so that it may be pinched | interposed into the 1st bending edge part 31 and the 2nd bending edge part 41 between the left main body 30 and the right main body 40. The size of the lower tube 60 is also changed. The left main body 30 and the right main body 40 are adjusted in position in the left-right direction by the main body position adjusting mechanism 80 so that a slight gap of a predetermined size is formed between the left main body 30 and the right main body 40. That is, the horizontal position adjustment of the left main body 30 and the right main body 40 is performed according to the size of the lower tube 60.

The configuration of the main body position adjusting mechanism 80 shown here is an example, and the present invention is not limited to this. For example, here, the position adjustment of the movable plate 71 and the movable plate 72 is performed by turning the handle 82 manually, but the position adjustment may be performed by a motor or the like. Here, the positions of both the movable plate 71 and the movable plate 72 are adjusted, but the present invention is not limited to this, and the main body position adjusting mechanism moves only one of the movable plate 71 and the movable plate 72 in the left-right direction. It may be a mechanism for moving the Here, the positions of the movable plate 71 and the movable plate 72 are adjusted by a mechanism in which the male screw of the feed screw 81 is engaged with the female screws of the movable plate 71 and the movable plate 72. However, the present invention is not limited to this. Position adjustment may be performed using a mechanism having a pinion and a pinion.

Further, the forming mechanism 20 may not include the main body position adjusting mechanism 80. For example, the main body 21 is directly fixed to the base plate 100, and an operator lifts at least one of the left main body 30 and the right main body 40 and moves it to the left and right with respect to the base plate 100, thereby at least one of the left main body 30 and the right main body 40. You may be comprised so that a left-right position may be adjusted.

(2-1-3-3) Overlap Formation Portion The overlap formation portion 50 is a separate member from the main body 21. The overlap forming portion 50 sandwiches a part of the tubular film Fc formed into a tubular shape by being bent at the first bending edge portion 31 and the second bending edge portion 41, and is vertically sealed by a longitudinal sealing mechanism 14 described later. An overlapping portion A of the cylindrical film Fc is formed. Specifically, the overlap forming portion 50 sandwiches the end portion of the tubular film Fc on the side bent by the left main body 30 (the left end portion in the state of the belt-like film F) and is vertically sealed by the longitudinal seal mechanism 14. An overlapping portion A of the film Fc is formed. Note that the structure of the overlap forming portion 50 is an example, and the overlap forming portion 50 sandwiches the end of the tubular film Fc on the side bent by the right main body 40 and is vertically sealed by the longitudinal seal mechanism 14. An overlapping portion A of the film Fc may be formed.

The overlap forming part 50 mainly has two parallel first and second flat plates 51 and 52 extending in the left and right direction and the up and down direction (see FIG. 8). In other words, the first flat plate 51 and the second flat plate 52 are flat plates perpendicular to a straight line extending in the front-rear direction. The 1st flat plate 51 and the 2nd flat plate 52 are arrange | positioned so that a predetermined | prescribed slight clearance gap may be formed in the front-back direction. The first flat plate 51 is disposed in front of the second flat plate 52. When viewed from the front, the first flat plate 51 is formed in a trapezoidal shape in which the upper side and the lower side are parallel and the left side is perpendicular to the upper side and the lower side. On the other hand, when viewed from the front side, the second flat plate 52 is formed in a trapezoidal shape in which the upper side and the lower side are parallel and the right side is perpendicular to the upper side and the lower side. The first flat plate 51 and the second flat plate 52 are arranged such that a V-shape is formed by the oblique side (right side) of the first flat plate 51 and the oblique side (left side) of the second flat plate 52 when viewed from the front side. ing.

The end of the tubular film Fc bent at the first bending edge 31 and the second bending edge 41 to be bent by the left main body 30 (the left end in the state of the belt-like film F) is formed. The first flat plate 51 and the second flat plate 52 are held in a gap (see FIG. 7). On the other hand, the end of the tubular film Fc on the side bent by the right main body 40 (the right end in the state of the strip-shaped film F) is supported by the back surface (rear surface) of the second flat plate 52 (see FIG. 7). When the tubular film Fc is conveyed downward in such a state, the overlap portion A of the tubular film Fc is formed without causing wrinkles or the like by the overlap forming portion 50, and the overlap portion A is a vertical seal mechanism 14 described later. Is vertically sealed.

Note that the height of the overlap forming unit 50 is adjusted by the vertical position adjusting mechanism 55 and is held at the position adjusted by the vertical position adjusting mechanism 55.

(2-1-3-4) Vertical Position Adjustment Mechanism The vertical position adjustment mechanism 55 is an example of a position adjustment mechanism for the overlap forming unit 50. The vertical position adjusting mechanism 55 adjusts the vertical position (height position) of the overlap forming unit 50. Further, the vertical position adjusting mechanism 55 holds the overlap forming portion 50 at the adjusted position. The vertical position adjustment of the overlap forming portion 50 by the vertical position adjustment mechanism 55 is performed when the bag making conditions are changed (for example, the width of the belt-like film F used for bag making or the height of the bag B to be bag made (in the vertical seal direction). For example, when the length is changed).

The vertical position adjustment mechanism 55 mainly includes two support posts 56, a main body 57, a height adjustment screw 58, and two knob bolts 59 (see FIG. 8).

The support column 56 is fixed to a detachable base 103 that is fixed to the base plate 100 (see FIG. 8). The column 56 extends upward from the detachable base 103 (see FIG. 8). Each of the columns 56 is formed with a slit 56a that penetrates the column 56 in the left-right direction and extends in the up-down direction (see FIG. 8).

The main body portion 57 includes a cylindrical portion 57a and a connecting portion 57b extending rearward from the back side of the cylindrical portion 57a (see FIG. 8). The column part 57a is a columnar member extending in the left-right direction. Female screws (not shown) into which screw parts (not shown) of the knob bolts 59 are respectively screwed are formed at the left and right ends of the cylindrical part 57a. Further, a through hole (not shown) extending in the vertical direction is formed on the side surface of the cylindrical portion 57a, and a female screw for screwing the height adjusting screw 58 is formed in the through hole. The connecting portion 57 b connects the columnar portion 57 a and the first flat plate 51 and the second flat plate 52 that constitute the overlap forming portion 50. By adjusting the height position of the main body portion 57, the height position of the overlap forming portion 50 is adjusted.

Thread portions (not shown) of knob bolts 59 that are screwed into female screws formed at the left and right ends of the main body portion 57 are inserted into each slit 56a. The knob bolts 59 arranged on the left and right with respect to the cylindrical part 57a are screwed into the cylindrical part 57a, so that the column 56 is sandwiched between the knobs of the two knob bolts 59, and the position of the cylindrical part 57a is fixed. At the time of adjusting the height position of the main body 57, the knob bolt 59 is loosened with respect to the cylindrical portion 57a.

The height position of the main body 57 is adjusted by rotating a knob 58a (see FIG. 8) disposed below the detachable base 103 of a height adjusting screw 58 to be screwed into the cylindrical portion 57a. After adjusting the position of the main body portion 57, the knob bolt 59 is tightened toward the cylindrical portion 57a, and the position of the main body portion 57 is fixed.

The detachable base 103 to which the vertical position adjusting mechanism 55 is fixed is fixed to the base plate 100 by two clamps 103a (see FIG. 8). When the clamp 103a is loosened (when the fixed state by the clamp 103a is released), the vertical position adjusting mechanism 55 can be removed from the base plate 100 (see FIG. 4). In other words, the overlap forming portion 50 supported by the vertical position adjusting mechanism 55 can be detached from the forming mechanism 20 independently of the main body 21 of the forming mechanism 20.

(2-1-4) Lower tube The lower tube 60 allows the article C (package) supplied to the tubular film Fc from the combination weighing machine 2 arranged above the bag making and packaging machine 3 to pass through the inside. It is a tube. More specifically, the lower tube 60 receives the article C supplied from the combination weighing machine 2 via the funnel member 11 and the upper tube 12, and transfers it to the cylindrical film Fc (see FIG. 2).

The lower tube 60 has a cylindrical portion 61 formed in a cylindrical shape (see FIG. 3). When the cylindrical portion 61 is viewed from above with a horizontal plane cut, the front surface and the rear surface of the cylindrical portion 61 linearly extend in parallel with each other, and the left side surface and the right side surface of the cylindrical portion 61 are generally circular. It is formed in an arc shape. A spreader 60a for expanding the tubular film Fc from the inner side is provided at the lower end of the tubular portion 61 (see FIG. 3).

The cylindrical portion 61 of the lower tube 60 is provided between the left main body 30 and the right main body 40 of the forming mechanism 20 between the first bending edge 31 of the left main body 30 and the second bending edge 41 of the right main body 40. It arrange | positions so that it may be enclosed (refer FIG. 3). The left side surface of the lower tube 60 is disposed adjacent to the first bending edge 31 of the left main body 30 with a slight gap of a predetermined size. The right side surface of the lower tube 60 is disposed adjacent to the second bending edge 41 of the right main body 40 with a slight gap of a predetermined size.

The first bending edge portion 31 and the second bending edge portion 41 guide the belt-like film F so as to be wound around the outer surface of the tubular portion 61 of the lower tube 60. The cylindrical film Fc in which the overlap portion A is formed by the overlap forming unit 50 is conveyed downward.

In addition, the lower tube 60 has a flange portion 62 that extends in the left and right and front and rear directions from the upper end of the cylindrical portion 61 (see FIG. 3). When the lower tube 60 is viewed from above, the flange portion 62 expands outward from the tubular portion 61 (not toward the inside of the tubular portion 61). The flange portion 62 is a plate-like member for fixing the lower tube 60 to the fixed base 102 (see FIG. 3). The flange portion 62 is fixed by a fixed base 102 and two clamps 63 (see FIG. 3). The fixed base 102 is supported by a column 101 extending upward from the base plate 100 (see FIG. 3). When the clamp 63 is loosened (when the fixed state by the clamp 63 is released), the lower tube 60 can be removed from the fixed base 102 (see FIG. 4). The lower tube 60 can be detached from the bag making and packaging machine 3 independently of the molding mechanism 20.

The lower tube 60 is removed / attached when, for example, the size of the lower tube 60 is changed according to the width in the left-right direction of the belt-like film F that uses the bag B for bag making. The lower tube 60 is removed / attached for maintenance such as cleaning of the lower tube 60 especially when the article C is food.

A socket 61a for injecting an inert gas into the lower tube 60 is provided on the front side of the tubular portion 61 of the lower tube 60 and above the position where the tubular film Fc is wound by the forming mechanism 20. It is attached (see FIG. 3). A one-touch joint (not shown) to which a tube for supplying an inert gas is connected is attached to the socket 61a. Note that the socket 61a provided in the lower tube 60 is configured to fill the bag B with an inert gas. If the bag B is not filled with the inert gas, the socket 61a is unnecessary.

(2-1-5) Pull-down belt mechanism The pull-down belt mechanism 13 sucks the cylindrical film Fc wound around the lower tube 60 and continuously conveys it downward. The pull-down belt mechanism 13 has a pair of belts 13c arranged so as to sandwich the lower tube 60 between the left and right sides of the lower tube 60 (see FIG. 2). The belt 13c has an adsorption function. The belt 13c is rotationally driven by a driving roller 13a (see FIG. 2) driven by a motor (not shown) and a driven roller 13b (see FIG. 2), so that the cylindrical film Fc adsorbed by the belt 13c is lowered. It is conveyed to.

(2-1-6) Vertical Sealing Mechanism The vertical sealing mechanism 14 vertically seals (seals in the vertical direction) the overlapping part (overlapping part A) of the tubular film Fc wound around the lower tube 60.

The vertical seal mechanism 14 is disposed on the front side of the lower tube 60 (see FIG. 2). The vertical seal mechanism 14 includes a heater (not shown), a heater belt (not shown) that contacts the overlapping portion A of the tubular film Fc, and a drive mechanism (not shown) that drives the heater belt. The heater heats the heater belt. The drive mechanism drives the heater belt in the front-rear direction so as to approach the lower tube 60 or away from the lower tube 60. When the heat belt is driven so as to approach the lower tube 60 by the drive mechanism, the overlapping portion A of the tubular film Fc wound around the tubular portion 61 of the lower tube 60 is located between the heater belt and the lower tube 60. Sandwiched between. The vertical sealing mechanism 14 heat seals the overlapping portion A of the tubular film Fc by pressing the overlapping portion A of the tubular film Fc against the lower tube 60 with a constant pressure with a heated heater belt.

(2-1-7) Horizontal Seal Mechanism The horizontal seal mechanism 15 is disposed below the forming mechanism 20, the pull-down belt mechanism 13, and the vertical seal mechanism 14 (see FIG. 2). The lateral seal mechanism 15 is a mechanism including a pair of seal jaws 15a incorporating a heater (see FIG. 2).

The pair of seal jaws 15a is driven by a motor (not shown) and turns in a substantially D shape while drawing a symmetrical locus. As the driving mechanism for the turning movement, for example, one disclosed in Japanese Patent Laid-Open No. 10-53206 is used. The pair of sealing jaws 15a swirling in a substantially D shape sandwich the tubular film Fc in a state where they are pressed against each other, and apply pressure and heat to a part of the tubular film Fc that is the upper and lower ends of the bag. Apply seal. The pair of sealing jaws 15a is configured so that the cylindrical film Fc vertically sealed by the vertical sealing mechanism 14 intersects with the conveyance direction of the cylindrical film Fc, more specifically, perpendicular to the conveyance direction of the cylindrical film Fc. Seal sideways in the direction. A cutter (not shown) is built in one of the sealing jaws 15a. The cutter separates the bag B and the subsequent tubular film Fc at the center position in the height direction of the horizontal seal portion by the seal jaw 15a.

(2-2) Film Supply Unit The film supply unit 3b is a unit that supplies the sheet-like strip film F to the forming mechanism 20 of the bag making and packaging unit 3a. The film supply unit 3b is provided adjacent to the bag making and packaging unit 3a (see FIG. 1). A roll (not shown) around which the film is wound is set in the film supply unit 3b, and the belt-like film F is fed out from this roll. The belt-like film F fed out from the roll is fed out by the operation of a motor (not shown) that rotates the roll, and is conveyed by the operation of the pull-down belt mechanism 13 of the bag making and packaging unit 3a.

(3) Features Features of the bag making and packaging machine 3 according to this embodiment will be described below.

(3-1)
The bag making and packaging machine 3 according to the present embodiment includes a forming mechanism 20, a vertical seal mechanism 14, and a horizontal seal mechanism 15. The forming mechanism 20 forms the tubular film Fc by bending the belt-like film F in the width direction extending in the left-right direction so that the left end portion and the right end portion of the belt-like film F overlap each other. The vertical sealing mechanism 14 vertically seals the overlapping portion (overlapping portion A) of the tubular film Fc. The horizontal sealing mechanism 15 performs horizontal sealing on the vertically sealed tubular film Fc. The forming mechanism 20 includes a main body 21 and an overlap forming portion 50. The main body 21 includes a first bending edge portion 31 and a second bending edge portion 41, and a first curved surface forming portion 32 and a second curved surface forming portion 42. The first bending edge 31 and the second bending edge 41 bend the belt-like film F to form the tubular film Fc. The first curved surface forming part 32 and the second curved surface forming part 42 are arranged upstream of the first bending edge 31 and the second bending edge 41 in the conveying direction of the belt-like film F, respectively. Are led to the first bending edge 31 and the second bending edge 41. The overlap forming part 50 is a separate member from the main body 21. The overlap forming part 50 sandwiches a part of the tubular film Fc that is bent at the first bending edge 31 and the second bending edge 41 and is formed into a tubular shape, thereby forming an overlapping part A of the tubular film Fc. To do. The main body 21 is divided into a left main body 30 disposed on the left side and a right main body 40 disposed on the right side, and the right and left positions of the right main body 40 and the left main body 30 can be adjusted.

In the bag making and packaging machine 3 according to the present embodiment, the main body 21 is divided into the left main body 30 and the right main body 40, and the left and right positions of the left main body 30 and the right main body 40 can be adjusted. The size of the bag B can be changed without using a complicated mechanism for changing the shape of the bag B. Here, since the shapes of the first bending edge 31 and the second bending edge 41 themselves do not change, it is possible to realize bag making of various size ranges without causing abnormalities such as meandering of the film. An easy and highly reliable bag making and packaging machine 3 can be provided.

Here, since the overlap forming part 50 is a separate member from the main body 21, the position of the overlap forming part 50 can be adjusted independently of the main body 21, and according to the bag making conditions (size of the bag B, etc.). Therefore, it is easy to always make the forming mechanism 20 an optimal configuration. Furthermore, since the overlap formation part 50 is a member different from the main body 21 here, the overlap formation part 50 is changed, and the form of the overlap part (back seal) of the cylindrical film vertically sealed (for example, fin seal, It is also easy to change the wrap seal.

(3-2)
In the bag making and packaging machine 3 according to the present embodiment, the forming mechanism 20 further includes a vertical position adjusting mechanism 55 as an example of a position adjusting mechanism that adjusts the position of the overlap forming portion 50. The vertical position adjustment mechanism 55 adjusts the height position of the overlap forming unit 50.

In the bag making and packaging machine 3 according to the present embodiment, since the molding mechanism 20 further includes a vertical position adjustment mechanism 55 that adjusts the position of the overlap forming portion 50, another overlap forming portion 50 is provided for each position of the overlap forming portion 50. Without preparation, the position of the overlap forming portion 50 can be adjusted to an appropriate position where no abnormality such as meandering of the film occurs.

(3-3)
The bag making and packaging machine 3 according to the present embodiment further includes a lower tube 60 as an example of a tube through which the article C supplied to the tubular film Fc from above the bag making and packaging machine 3 passes. The lower tube 60 is disposed between the left main body 30 and the right main body 40 so as to be surrounded by the first bending edge 31 and the second bending edge 41.

In the bag making and packaging machine 3 according to the present embodiment, since the lower tube 60 for supplying the article C is arranged inside the main body 21, it is easy to guide the article C into the cylindrical film Fc.

(3-4)
In the bag making and packaging machine 3 according to the present embodiment, the lower tube 60 can be detached from the bag making and packaging machine 3 independently of the forming mechanism 20. Position adjustment in the left-right direction of the right main body 40 and the left main body 30 is performed according to the size of the lower tube 60.

In the bag making and packaging machine 3 according to the present embodiment, since the lower tube 60 can be removed independently of the molding mechanism 20, only the lower tube 60 that is in contact with the article C and requires maintenance such as cleaning is removed. The maintenance of the device is high. Moreover, it is easy to change the lower tube 60 according to the size of the bag B.

(3-5)
In the bag making and packaging machine 3 according to the present embodiment, the overlap forming unit 50 can be detached from the molding mechanism 20 independently of the main body 21.

Specifically, the bag making and packaging machine 3 includes a base plate 100 to which the main body 21 and the overlap forming unit 50 are attached. The overlapping portion 50 can be detached from the base plate 100 independently of the main body 21.

Note that the overlap forming portion 50 is attached and detached when the overlap forming portion 50 is replaced with another shape, or when the position of the overlap forming portion 50 is adjusted in the left-right direction. When the overlap forming portion 50 is exchanged with another shape, for example, the bag to be bag-made is a front surface (outer surface) at one end of the tubular film Fc and a rear surface (inner surface) at the other end as in the above embodiment. ) And a bag B1 having a vertical seal T1 (fin seal) in which the inner surface of one end and the inner surface of the other end of the tubular film Fc overlap each other. This is a case of changing to (see FIG. 10A). In this case, the overlap forming portion is sandwiched so as to sandwich both ends of the tubular film Fc, thereby forming an overlapping portion of the tubular film. Further, when the position of the overlap forming portion 50 is adjusted in the left-right direction, for example, a bag to be bag-made has a vertical seal T near the center in the left-right direction as in the above embodiment (see FIG. 9). This is a case where the bag B2 having the vertical seal T2 shifted to the right side is changed (see FIG. 10B).

In the bag making and packaging machine 3 according to the present embodiment, it is possible to remove and replace only the overlap forming portion 50 from the forming mechanism 20 without removing the main body 21 (only the overlap forming portion 50 is removed from the base plate 100). Therefore, the overlap forming portion 50 can be easily replaced according to the shape of the vertical seal of the bag B.

(3-6)
In the bag making and packaging machine 3 according to the present embodiment, the first bending edge portion 31 includes a first curve forming portion 31a for forming a curved portion of the tubular film Fc and a first portion for forming a straight portion of the tubular film Fc. Linear forming part 31b. The second bending edge portion 41 includes a second curve forming portion 41a for forming the curved portion of the tubular film Fc, and a second linear forming portion 41b for forming the straight portion of the tubular film Fc. The left main body 30 includes a first curve forming portion 31a and a first linear forming portion 31b extending from the end of the first curve forming portion 31a toward the right main body 40. The right main body 40 includes a second curved line forming part 41a and a second straight line forming part 41b extending from the end of the second curved line forming part 41a toward the left main body 30.

In the bag making and packaging machine 3 according to the present embodiment, each of the left main body 30 and the right main body 40 includes the first linear forming portion 31b and the second linear forming portion 41b that linearly extend toward the other. Even when a large-sized bag B is molded, it is easy to precisely form the shape of the straight portion of the bag B.

(4) Modifications Modifications of the present embodiment are shown below. It should be noted that a plurality of modified examples may be combined as appropriate within a range that does not contradict each other.

(4-1) Modification A
The shape of the 1st bending edge part 31 and the 2nd bending edge part 41 of the shaping | molding mechanism 20 which concerns on the said embodiment is an example, Comprising: It is not limited to this.

For example, the first bending edge 31 and the second bending edge 41 are formed symmetrically, but the first bending edge and the second bending edge may be formed asymmetrically.

In addition, the first bending edge 31 and the second bending edge 41 have the first straight forming part 31b and the second straight forming part 41b, respectively, but the present invention is not limited to this. The edge 31 and the second bending edge 41 may have only the first curve forming part 31a and the second curve forming part 41a, respectively. However, in order to precisely shape the shape of the bag B, the first bending edge portion 31 and the second bending edge portion 41 are added to the first curve forming portion 31a and the second curve forming portion 41a, respectively. It is preferable to have the 1st linear shaping | molding part 31b and the 2nd linear shaping | molding part 41b.

(4-2) Modification B
The forming mechanism 20 according to the embodiment includes the vertical position adjusting mechanism 55 that adjusts the vertical position of the overlap forming portion 50, but the position adjusting mechanism that adjusts the position of the overlap forming portion 50 is limited to such a mechanism. It is not a thing. For example, the position adjustment mechanism that adjusts the position of the overlap forming portion 50 may change the position of the overlap forming portion 50 in the front-rear direction and / or the left-right direction instead of the vertical direction, or in the front-rear direction and / or in addition to the vertical direction. You may adjust in the left-right direction.

(4-3) Modification C
Although the forming mechanism 20 according to the embodiment includes the vertical position adjusting mechanism 55 that adjusts the position of the overlap forming portion 50, the present invention is not limited to this. The overlap forming unit 50 may not have the vertical position adjusting mechanism 55. However, in order to cope with various sizes of the bags B without exchanging the overlap forming portion 50, it is preferable that the forming mechanism 20 has the vertical position adjusting mechanism 55.

(4-4) Modification D
In the bag making and packaging machine 3 according to the above embodiment, the lower tube 60 can be detached from the bag making and packaging machine 3 independently of the forming mechanism 20, but is not limited thereto. However, by making the lower tube 60 removable from the bag making and packaging machine 3 independently of the molding mechanism 20, it is easy to perform maintenance of the lower tube 60 and replacement of the lower tube 60.

(4-5) Modification E
The bag making and packaging machine 3 according to the above embodiment has the lower tube 60, but is not limited to this, and the bag making and packaging machine 3 is for making bags B without using the lower tube 60. May be. However, in order to accurately shape the shape of the tubular film Fc and guide the article C to the tubular film Fc, it is preferable that the bag making and packaging machine 3 includes the lower tube 60.

(4-6) Modification F
As shown in FIG. 11, the forming mechanism 20 may further include a guide G that supports the conveyance path of the tubular film Fc, which is disposed so as to connect the left main body 30 and the right main body 40. More specifically, the forming mechanism 20 includes a guide G connecting the first linear forming part 31b in front of the first bending edge 31 and the second linear forming part 41b in front of the second bending edge 41; One or both of the guides G connecting the first straight line forming part 31b behind the first bending edge part 31 and the second straight line forming part 41b behind the second bending edge part 41 may be provided. Here, since the guide G supports a portion of the conveyance path of the tubular film Fc that is not directly supported by the main body 21 (the left main body 30 and the right main body 40), it is further easier to suppress abnormalities such as film meandering. It is.

(4-7) Modification G
The vertical sealing mechanism 14 and the horizontal sealing mechanism 15 according to the above embodiment both heat-seal the tubular film Fc with a heater (not shown), but the vertical sealing mechanism 14 and the horizontal sealing mechanism 15 are limited to such a configuration. Instead, the cylindrical film Fc may be ultrasonically sealed.

Further, the drive mechanism of the lateral seal mechanism 15 drives the seal jaw 15a to rotate in a substantially D shape, but the drive mechanism drives the seal jaw 15a linearly so as to approach each other or away from each other. It may be.

Further, the vertical seal mechanism 14 is configured such that a part or all of the mechanism can be exchanged according to the form (fin seal, lap seal, etc.) of the overlapping portion (back seal) of the cylindrical film to be vertically sealed. Also good.

(4-8) Modification H
In the said embodiment, although the left main body 30 and the right main body 40 of the shaping | molding mechanism 20, and the lower tube 60 are each independent members, the structure of the bag making packaging machine which concerns on this invention is limited to such a structure. It is not something.

For example, the bag making and packaging machine includes a divided tube in which a portion corresponding to the tubular portion 61 of the lower tube 60 is divided into a plurality of members instead of the lower tube 60. Each of the divided members of the divided tube may be configured to move together with the left main body 30 or the right main body 40 during the position adjustment.

Describing with a specific example, the bag making and packaging machine may include a divided tube 160 instead of the lower tube 60 (see FIG. 12). As shown in FIG. 12, the split tube 160 mainly includes a left split member 161, a right split member 162, a left support member 161a, and a right support member 162a.

The left split member 161 is formed in a shape corresponding to the left curved surface portion (see FIG. 3) of the cylindrical portion 61 of the lower tube 60. Specifically, the left split member 161 is a semicircular tube shape without a right half extending in the vertical direction (a shape obtained by cutting a virtual circular tube extending in the vertical direction in half along the length direction (vertical direction)). (See FIG. 12). Note that the shape of the left split member 161 is not limited to a semicircular tube shape, for example, a shape obtained by cutting a virtual tube having an elliptical cross section extending in the vertical direction into half along the vertical direction. May be.

The right split member 162 is formed in a shape corresponding to the curved surface portion on the right side of the cylindrical portion 61 of the lower tube 60 (see FIG. 3). Specifically, the right split member 162 is formed in a semicircular tube shape extending in the vertical direction and having no left half (see FIG. 12). Note that the shape of the right split member 162 is not limited to a semicircular tube shape. For example, the shape of the virtual tube having an elliptical cross section extending in the vertical direction is cut in half along the vertical direction. May be.

The left split member 161 is disposed so as to be surrounded by the first bending edge 31 of the left main body 30 (see FIG. 12). The left split member 161 is disposed adjacent to the first bending edge 31 of the left main body 30 with a slight gap of a predetermined size. Further, the left dividing member 161 is disposed adjacent to the right curved surface 30a (see FIG. 5) of the left main body 30 with a slight gap of a predetermined size (see FIG. 12).

The right split member 162 is disposed so as to be surrounded by the second bending edge 41 of the right main body 40 (see FIG. 12). The right split member 162 is disposed adjacent to the second bending edge 41 of the right main body 40 with a slight gap of a predetermined size. Further, the right dividing member 162 is disposed adjacent to the left curved surface 40a (see FIG. 5) of the right main body 40 with a slight gap of a predetermined size (see FIG. 12).

The left support member 161a is a member that supports the left split member 161. The left support member 161a is formed in an L shape. One end of the L-shaped left support member 161a is fixed to the upper outer surface of the left split member 161, and the other end is fixed to the movable plate 71, respectively. The left support member 161 a may be configured such that one end side is fixed to the upper outer surface of the left split member 161 and the other end side is fixed to the outer surface of the left main body 30.

The right support member 162a is a member that supports the right split member 162. The right support member 162a is formed in an L shape. One end of the L-shaped right support member 162 a is fixed to the upper outer surface of the right split member 162, and the other end is fixed to the movable plate 72. The right support member 162 a may be configured such that one end side is fixed to the upper outer surface of the right split member 162 and the other end side is fixed to the outer surface of the right main body 40.

By being configured like the divided tube 160, even if the movable plate 71 and the movable plate 72 are moved and the positions of the left main body 30 and the right main body 40 are adjusted, the left main body 30 and the left divided member 161 The relative positional relationship and the relative positional relationship between the right main body 40 and the right split member 162 are not changed. In other words, by being configured like the divided tube 160, when the positions of the left main body 30 and the right main body 40 are adjusted, the positions of the left divided member 161 and the right divided member 162 are also adjusted simultaneously.

Therefore, unlike the above embodiment, it is not necessary to replace the tube (lower tube 60) when changing the bag size, and workability can be improved. Here, unlike the above-described embodiment, it is not necessary to prepare tubes (lower tubes 60) having different dimensions for each bag size, and the costs related to the tubes can be reduced.

The bag making and packaging machine according to the present invention is useful as a highly reliable bag making and packaging machine capable of making bags of various sizes with a simple configuration and suppressing the occurrence of abnormalities such as film meandering. is there.

3 Bag making and packaging machine 14 Vertical seal mechanism 15 Horizontal seal mechanism 20 Molding mechanism 21 Main body 30 Left main body 40 Right main body 31 First bending edge (bending edge)
41 Second bending edge (bending edge)
31a 1st curve formation part 31b 1st straight line formation part 41a 2nd curve formation part 41b 2nd straight line formation part 32 1st curved surface formation part (curved surface formation part)
42 2nd curved surface formation part (curved surface formation part)
50 Overlap forming portion 55 Vertical position adjustment mechanism (position adjustment mechanism)
60 Lower tube (tube)
C Goods (packaged items)
F Strip film Fc Cylindrical film G Guide

Japanese Patent Laid-Open No. 11-130007

Claims (8)

1. A forming mechanism for forming a tubular film by bending the belt-like film in the width direction extending in the left-right direction so that the left end and the right end of the belt-like film overlap;
   A longitudinal seal mechanism for longitudinally sealing the overlapping portions of the tubular films;
   A lateral sealing mechanism for laterally sealing the cylindrical film that has been longitudinally sealed;
   A bag making and packaging machine comprising:
   The molding mechanism is
   A bending edge that bends the belt-like film to form the tubular film, and a curve that is disposed upstream of the bending edge in the transport direction of the belt-like film and guides the belt-like film to the bending edge. A body having a surface forming portion;
   An overlap forming portion that is a separate member from the main body, sandwiches a part of the tubular film that is bent at the bending edge and is formed into a tubular shape, and forms an overlapping portion of the tubular film;
   Have
   The main body is divided into a left main body arranged on the left side and a right main body arranged on the right side, and is configured to be capable of adjusting the position in the left-right direction of at least one of the left main body and the right main body.
   Bag making and packaging machine.
2. The molding mechanism further includes a position adjustment mechanism for adjusting the position of the overlap forming portion.
   The bag making and packaging machine according to claim 1.
3. The position adjusting mechanism adjusts a height position of the overlap forming portion;
   The bag making and packaging machine according to claim 2.
4. The package to be supplied to the cylindrical film from above the bag making and packaging machine further includes a tube through which the inside passes,
   The tube is disposed between the left main body and the right main body so as to be surrounded by the bending edge.
   The bag making and packaging machine according to any one of claims 1 to 3.
5. The tube is removable from the bag making and packaging machine independently of the molding mechanism,
   Position adjustment in the left-right direction of the right body and / or the left body is performed according to the size of the tube.
   The bag making and packaging machine according to claim 4.
6. A base plate to which the main body and the overlap forming portion are attached;
   The overlap forming part is removable from the base plate independently of the main body,
   The bag making and packaging machine according to any one of claims 1 to 5.
7. The molding mechanism is further arranged to connect between the left main body and the right main body, and further includes a guide for supporting a transport path of the tubular film.
   The bag making and packaging machine according to any one of claims 1 to 6.
8. The bending edge includes first and second curve forming portions for forming a curved portion of the tubular film, and first and second linear forming portions for forming a straight portion of the tubular film,
   The left main body includes the first curve forming portion and the first linear forming portion extending from the end of the first curve forming portion toward the right main body,
   The right body includes the second curved line forming part and the second straight line forming part extending from the end of the second curved line forming part toward the left main body.
   The bag making and packaging machine according to any one of claims 1 to 7.

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