JP2014144809A - Bag forming and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag forming and packaging machine which enables stable production of a bag having high self-standing performance.SOLUTION: A forming mechanism 11 forms a sheet-like packaging material into a cylindrical shape by winding around a tube. A seal mechanism seals the cylindrical packaging material so as to intersect the direction in which the cylindrical packaging material extends, thereby forming a seal part extending in the width direction of the cylindrical packaging material, in the cylindrical material. A spreader 62 expands the vicinity of the seal part in the depth direction by oscillating a pair of leg parts in the depth direction to form a bottom shape part in the cylindrical packaging material. A first press bending mechanism forms a bag lower part of a bag by press-bending the seal part in the depth direction. A second press bending mechanism forms a bottom part in the cylindrical packaging material by press-bending the seal part in the longitudinal direction. An adjustment mechanisms 64 modifies the height position of the oscillation axis which serves as the center of oscillation of the leg parts to adjust the aperture of the leg parts.

Description

  The present invention relates to a bag making and packaging machine for producing a self-supporting bag.

  BACKGROUND ART A bag making and packaging machine is used as an apparatus for making and packaging bags while filling a packaging material such as confectionery. The bag making and packaging machine uses a sealing mechanism to seal the cylindrical packaging material in a direction intersecting the direction in which the cylindrical packaging material extends, and to seal the cylindrical packaging material (upper seal portion / lower seal portion). Forming a seal portion). After that, the cylindrical packaging material in which the seal portion is formed is cut into a bag by cutting the seal portion with a cutter. By the way, in recent years, since the ease of display of products and the display effect are excellent, for example, a bag making for manufacturing a self-supporting bag as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-136270), for example. A packaging machine has been proposed. The self-supporting bag has a bottom portion that serves as a bottom surface when it is self-supporting. The bag making and packaging machine proposed in Patent Document 1 includes a spreader that expands the vicinity of a seal portion of a cylindrical packaging material from the inside. The spreader includes a pair of legs. The spreader forms a bottom-shaped portion in the cylindrical packaging material by changing the inclination of both legs so that the opening degree of the pair of legs increases. The bottom shaped portion is then transformed into the bottom of the bag.

  Here, in order to improve the self-supporting property of the bag, it is necessary to form a bottom having a good shape. The shape of the bottom changes depending on the opening of the pair of legs. That is, in order to form a well-shaped bottom portion, it is required that the pair of leg portions be spread so as to have a predetermined opening. However, the pair of leg portions may not have a predetermined opening degree due to variations in parts constituting the spreader. As a result, the bottom having a good shape cannot be formed and the self-supporting property may be lowered.

  The subject of this invention is providing the bag making packaging machine which makes it possible to manufacture a highly self-supporting bag stably.

  The bag making and packaging machine according to the present invention includes a forming mechanism, a seal mechanism, a spreader, an air cylinder, a first pushing / bending mechanism, a second pushing / bending mechanism, and an adjusting mechanism. The forming mechanism winds a sheet-like packaging material around a tube and forms it into a cylindrical shape. The sealing mechanism seals the cylindrical packaging material so as to intersect the direction in which the cylindrical packaging material extends, and forms a seal portion extending in the width direction of the cylindrical packaging material on the cylindrical packaging material. To do. The spreader includes a pair of legs. The pair of legs are located inside the cylindrical packaging material and swing in the depth direction to change the opening. The depth direction is a direction that intersects the width direction. The spreader swings the pair of leg portions so as to increase the opening, thereby expanding the vicinity of the seal portion in the depth direction to form a bottom-shaped portion in the cylindrical packaging material. The air cylinder is a drive unit that swings a pair of legs. The air cylinder switches between an open state and a closed state. An open state is a state where the opening degree of a pair of legs is the largest. The closed state is a state where the opening degree of the pair of legs is the smallest. The first push-bending mechanism forms a bag lower portion of the bag by bending the seal portion in the depth direction. The bag lower part includes a seal part and a part of the main body part. The second push-bending mechanism pushes and bends the side portion of the bag lower portion including the longitudinal end portion of the seal portion along the longitudinal direction of the seal portion to form a bottom portion in the cylindrical packaging material. The adjustment mechanism adjusts the opening degree of the pair of leg portions. The spreader further includes a swing shaft. The swing shaft is a center for swinging the pair of leg portions. The adjustment mechanism includes an adjustment unit. The adjustment unit changes the height position of the swing shaft.

  In the bag making and packaging machine according to the present invention, the height position of the swing shaft serving as the center for swinging the pair of leg portions is adjusted by the adjusting portion. Thereby, the opening degree of a pair of leg part is adjusted. As a result, a highly self-supporting bag can be stably manufactured.

  The spreader preferably further includes a fixed member, a moving member, and a link mechanism. The fixing member is fixed to the tube. The moving member extends in the direction in which the tube extends, and is attached to be movable relative to the fixed member. The link mechanism connects the moving member and the swinging shaft, and transmits the movement of the moving member to the swinging shaft. Moreover, it is preferable that an adjustment part changes the height position of a rocking | fluctuation shaft by changing the height position of a moving member. Since the height position of the swinging shaft is changed by changing the height position of the moving member attached so as to be movable relative to the fixed member, the pair of leg portions can be opened with the spreader attached to the tube. The degree can be adjusted.

  Moreover, it is preferable that an adjustment mechanism further contains a transmission part. A transmission part transmits the driving force by an air cylinder to an adjustment part. Moreover, the transmission part has a connection part. The connecting portion extends in the moving direction of the moving member and connects the adjusting portion. The adjustment part can adjust the height position connected with respect to a connection part. Since the height position of the moving member is changed by adjusting the height position of the adjusting portion connected to the connecting portion, the opening degree of the pair of leg portions can be easily adjusted.

  The bag making and packaging machine according to the present invention makes it possible to stably manufacture a highly self-supporting bag.

It is an external appearance perspective view of the bag making packaging machine which concerns on one Embodiment of this invention. It is a schematic perspective view of the bag making packaging machine which concerns on one Embodiment of this invention. It is a schematic perspective view which shows a part of forming mechanism, a pull-down belt mechanism, a vertical seal mechanism, and a part of a spreader mechanism. It is a schematic side view which shows a part of shaping | molding mechanism, a pull-down belt mechanism, a vertical seal mechanism, and a part of a spreader mechanism. It is a schematic front view which shows a part of forming mechanism, a pull-down belt mechanism, a vertical seal mechanism, and a part of a spreader mechanism. It is a schematic rear view of a tube. It is VIIA-VIIA sectional drawing of the tube shown in FIG. It is VIIB-VIIB sectional drawing of the tube shown in FIG. It is an enlarged view of a leg part. It is IX-IX sectional drawing of the leg part shown in FIG. It is a perspective view which shows a pair of opening-and-closing leg in a closed state, and a tension addition member in a contact state. It is a figure which shows the structure which removed the tension addition member (and attachment plate of a tension addition member) of FIG. 10A. It is a perspective view which shows a pair of opening-and-closing leg in an open state, and a tension addition member in a non-contact state. It is a figure which shows the structure which removed the tension addition member (and attachment plate of a tension addition member) of FIG. 11A. It is the figure which looked at the spreader from the right side of a bag making packaging machine. Specifically, a pair of open / close legs in a closed state and a tension applying member in a contact state are shown. It is the figure which looked at the spreader from the right side of a bag making packaging machine. Specifically, a pair of open / close legs in an open state and a tension applying member in a non-contact state are shown. It is the figure which looked at the spreader from the front side of a bag making packaging machine. Specifically, a pair of open / close legs in a closed state and a tension applying member in a contact state are shown. It is the figure which looked at the spreader from the front side of a bag making packaging machine. Specifically, a pair of open / close legs in an open state and a tension applying member in a non-contact state are shown. It is a perspective view of an opening-and-closing leg. It is a figure for demonstrating the 1st opposing surface of an opening-and-closing leg. It is a figure for demonstrating the 2nd opposing surface of an opening-and-closing leg. It is a figure for demonstrating a link mechanism and an opening-and-closing amount adjustment mechanism. It is a figure for demonstrating a link mechanism and an opening-and-closing amount adjustment mechanism. It is a figure for demonstrating a link mechanism and an opening-and-closing amount adjustment mechanism. It is a figure which shows an opening-and-closing amount adjustment mechanism. It is a schematic perspective view of a 1st pushing bending mechanism. It is the figure which looked at the 1st pushing bending mechanism from the right side of a bag making packaging machine. It is an image figure of the 1st pushing bending mechanism which contacts a bag lower part. It is a figure which shows the side part pushed and bent upwards by the protrusion part which contacts from the downward direction. It is a schematic perspective view of a 2nd pushing bending mechanism. It is the figure which looked at the 2nd pushing bending mechanism from the front side of the bag making packaging machine. It is a control block diagram of a bag making packaging machine. It is a figure which shows the pushing-bending operation | movement by a side plate. (A) is a figure which shows a mode that a side plate pushes and bends a side part downward. (B) is a figure which shows a mode that a side plate pushes and bends a side part upwards. (C) is a figure which shows a mode that a side plate pinches | interposes a side part between a column base part and an extension part. It is the elements on larger scale of FIG.30 (c). It is an image figure which shows the contact position of each structure with respect to a bottom part. It is a perspective view of the bag which the bag making packaging machine concerning one embodiment of the present invention manufactures. It is the figure which looked at the bag which the bag making packaging machine which concerns on one Embodiment of this invention manufactures from the bottom. It is the figure before completion of the bottom part of a bag (figure lower part figure).

  Hereinafter, a bag making and packaging machine 100 according to an embodiment of the present invention will be described with reference to the drawings.

(1) Overall Configuration FIG. 1 is an overall perspective view of a bag making and packaging machine 100 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 10 included in the bag making and packaging machine 100. In the description of the bag making and packaging machine 100, “upper”, “lower”, “left”, “right”, “front”, and “rear” are as defined in FIG. In the description of the bag making and packaging machine 100, the depth direction corresponds to the front-rear direction of FIG.

  The bag making and packaging machine 100 according to the present embodiment manufactures a bag B that can stand on its own by forming a sheet-like film Fs (see FIGS. 33A and 33B). Specifically, as shown in FIG. 2, the bag making and packaging machine 100 puts the article C into the tubular film Fc while forming the sheet film Fs into the tubular film Fc. Furthermore, the bag making and packaging machine 100 forms a portion (bottom part FB) of the bag B on the tubular film Fc, and manufactures a product (bag) B in which the article C is packed.

  As shown in FIGS. 33A and 33B, the bag B has an upper seal portion SL1 and a main body portion FL. The main body portion FL is a portion surrounding the filled article C. The main body FL includes a first surface S1 having a vertical seal portion LSP, a second surface S2 that is a surface facing the first surface S1, and side surfaces S3 and S3 sandwiched between the first surface S1 and the second surface S2. Have Moreover, the main-body part FL has the bottom part FB, as shown to FIG. 33B. The bottom FB includes a first adjacent surface S1 ′ adjacent to the lower end of the first surface S1, a second adjacent surface S2 ′ adjacent to the lower end of the second surface S2, and a third adjacent adjacent to the lower ends of the side surfaces S3 and S3. It is formed by the surfaces S3 ′, S3 ′ and the lower seal portion SL2. The bottom part FB constitutes the lower end of the bag B. The bottom FB is rectangular. That is, the bag B has a square bottom. Lower seal portion SL2 extends in the width direction of bottom portion FB. Third adjacent surfaces S3 'are folded over at both ends in the longitudinal direction of the lower seal portion SL2. The upper seal portion SL1 is located above the main body portion FL. The upper seal portion SL1 constitutes the upper end of the bag B.

  The bag making and packaging machine 100 mainly includes a film supply unit 2, a bag making and packaging unit 10, and a control unit 90 (see FIG. 1 or FIG. 29). The film supply unit 2 is a unit that supplies the film Fs that is the material of the bag B. The bag making and packaging unit 10 is a unit that forms the tubular film Fc into the bag B by filling the article C into the tubular film Fc while forming the sheet film Fs into the tubular film Fc. A combination weighing machine 200 is arranged above the bag making and packaging unit 10 as shown in FIG. The bag making and packaging unit 10 heat-seals the cylindrical film Fc in the vertical and horizontal directions while filling the cylindrical film Fc with a predetermined amount of the article C measured by the combination weighing machine 200, and the article C is packed. A bag B is manufactured (see FIG. 2). The control unit 90 controls the operations of the film supply unit 2 and the bag making and packaging unit 10. In other words, the control unit 90 is a unit responsible for controlling the bag making and packaging machine 100.

  The film supply unit 2 and the bag making and packaging unit 10 are supported by the main body 97. The main body 97 is a part that forms the framework of the bag making and packaging machine 100. The main body 97 is composed of a plurality of frames including a main body frame 97a. The main body frame 97 a is fixed at a predetermined height position with respect to other frames constituting the main body 97. The film supply unit 2 is disposed on the rear side of the main body 97. The bag making and packaging unit 10 is disposed at a position on the front side of the main body 97 with respect to the film supply unit 2. Therefore, the sheet-like film Fs supplied from the rear side of the bag making and packaging machine 100 is fed forward, becomes a cylindrical film Fc at the front, and then the article C is packed into a bag B.

  An operation panel 95 is disposed on the front side of the bag making and packaging machine 100. The operation panel 95 includes a liquid crystal display and a touch panel that covers the liquid crystal display. The operation panel 95 indicates the operating state of the bag making and packaging machine 100 to the user standing on the right side of the bag making and packaging machine 100. In addition, the operation panel 95 accepts input of various commands from the user to the bag making and packaging machine 100. The control unit 90 controls the operation of the bag making and packaging machine 100 based on an instruction from the user received through the operation panel.

  Hereinafter, the structure of the film supply unit 2, the bag making and packaging unit 10, and the control unit 90 constituting the bag making and packaging machine 100 will be described in detail.

(2) Film Supply Unit The film supply unit 2 is a unit that supplies the sheet-like film Fs to the forming mechanism 11 of the bag making and packaging unit 10. The film supply unit 2 is disposed on the rear side of the bag making and packaging machine 100 as described above. The film supply unit 2 is provided adjacent to the bag making and packaging unit 10. The film supply unit 2 includes an air shaft (not shown) and a shaft drive motor (not shown) for driving the air shaft. A film roll around which the film Fs is wound is set on the air shaft. When the shaft drive motor rotates the air shaft, the sheet-like film Fs wound around the film roll is fed out.

(3) Bag-making and packaging unit As described above, the bag-making and packaging unit 10 forms the product (bag) B in which the sheet C is formed by forming the sheet-like film Fs supplied by the film supply unit 2 and bagging the article C. Is a unit.

  As shown in FIG. 1 or 2, the bag making and packaging unit 10 mainly includes a forming mechanism 11, a pull-down belt mechanism 12, a vertical sealing mechanism 13, a shutter mechanism 14, a horizontal sealing mechanism 15, and a spreader mechanism 16. And a first push-bending mechanism 17 and a second push-bending mechanism 18. Hereinafter, the configuration included in the bag making and packaging unit 10 will be described in detail.

(3-1) Forming mechanism The forming mechanism 11 is a mechanism for forming the sheet-like film Fs into a tubular film Fc. The forming mechanism 11 is also a mechanism that guides the article C into the cylindrical film Fc. The molding mechanism 11 includes an introduction member 11a, a former 11b, and a support frame 30 (see FIG. 2 or FIGS. 3 to 5). Specifically, FIG. 2 shows the introduction member 11a and the former 11b. 3 to 5 show the tube 11ab included in the introduction member 11a and the support frame 30. FIG.

(3-1-1) Introducing member The introducing member 11a is a member for introducing the article C discharged from the combination weighing machine 200 into the cylindrical film Fc. As shown in FIG. 2, the article C falling from the combination weighing machine 200 (see FIG. 1) by a predetermined amount is put into the introduction member 11a through the opening at the upper end of the introduction member 11a. The article C passes through the inside of the introduction member 11a and falls. The introduction member 11a extends in the vertical direction. The introduction member 11a includes a funnel member 11aa and a tube 11ab.

(A) Funnel member As shown in FIG. 2, the funnel member 11aa constitutes an upper portion of the introduction member 11a. The funnel member 11aa has circular or elliptical openings at the upper end and the lower end. The circumferential length of the opening at the upper end of the funnel member 11aa is larger than the circumferential length of the opening at the lower end.

(B) Tube As shown in FIGS. 2 to 6, the tube 11ab is a member extending in the vertical direction. As shown in FIG. 2, the tube 11ab is connected to the lower end of the funnel member 11aa. The tube 11ab has a circular or elliptical opening communicating with the opening of the funnel member 11aa at the upper end.

  Specifically, tube 11ab is comprised from the flat surface, the side surface, and the notch formation surface. The flat surface is a surface located on the front side of the bag making and packaging machine 100. That is, the flat surface is disposed at a position where the vertical seal mechanism 13 is opposed. The flat surface is a flat surface extending in the vertical direction. On the other hand, the notch forming surface is a surface located on the back side of the bag making and packaging machine 100. As shown in FIG. 6, the cut-out forming surface is a surface in which a part of a flat surface extending in the vertical direction is cut out along the longitudinal direction. The side surfaces are located on both sides of the flat surface. The side surface is a surface that slightly curves in the left-right direction and extends in the up-down direction. The side surface connects the flat surface and the notch forming surface.

  7A and 7B show a VIIA-VIIA sectional view of FIG. 6 and a VIIB-VIIB sectional view of FIG. 6, respectively. As shown in FIG. 7A, at the upper end of the tube 11ab, the outer periphery is configured so that the cross-sectional shape has a shape similar to an ellipse. On the other hand, as shown in FIG. 7B, the portion excluding the upper end portion of the tube 11ab has a configuration in which a part of the outer periphery is cut away so that the cross-sectional shape is similar to the letter C.

  Inside the tube 11ab, partition members 11ac are arranged on both sides in the width direction (see FIGS. 7A and 7B). The partition member 11ac extends in the longitudinal direction of the tube 11ab inside the tube 11ab. That is, in the tube 11ab, two elongated holes 11ad surrounded by the inner wall of the tube 11ab and the partition member 11ac and an introduction path ip sandwiched between the two elongated holes 11ad are formed. The introduction path ip is a path for introducing the article C into the tubular film Fc. The long hole 11ad is a space into which a spreader 62 described later is inserted. A positioning member (not shown) is provided inside the long hole 11ad. The positioning member is a member used for positioning the spreader 62. The positioning member is disposed in the vicinity of the upper end in the longitudinal direction of the tube 11ab. The positioning member is provided inside the tube 11ab so as to cross the long hole 11ad.

(3-1-2) Former The former 11b is arrange | positioned so that the tube 11ab of the introduction member 11a may be surrounded. The former 11b guides the film Fs so that the sheet-like film Fs is wound around the tube 11ab. That is, the sheet-like film Fs fed out from the film roll is formed into a cylindrical shape when passing between the former 11b and the tube 11ab.

(3-1-3) Support Frame The support frame 30 is a frame that supports the introduction member 11a and the former 11b. The support frame 30 supports the introduction member 11a and the former 11b so as to be movable with respect to the main body frame 97a. In other words, by moving the support frame 30 relative to the main body frame 97a, the introduction member 11a and the former 11b move relative to the main body frame 97a.

  As shown in FIG. 3, the support frame 30 mainly includes a plate member 31, a pair of left and right handles 32, 32, beams 33 a, 33 b, 33 c, and legs 34. The plate member 31, the handles 32, 32, the beams 33a, 33b, 33c, and the legs 34 are fixed, and their positional relationship is constant. Hereinafter, each component included in the support frame 30 will be described.

(A) Plate member The plate member 31 is a substantially rectangular member in plan view (see FIG. 3). A substantially circular opening 31 a is formed in the center of the plate member 31 in plan view. The tube 11ab passes through the opening 31a. A leg portion 34 to be described later is provided on the lower surface of the plate member 31.

(B) Handle As shown in FIGS. 3 to 5, the handles 32 and 32 are portions that are gripped by the user when the support frame 30 is moved. The handles 32, 32 are columnar members. The handles 32 are provided on the upper surface of the plate member 31. Specifically, the handles 32, 32 are arranged on the front side of the upper surface of the plate member 31 and on both the left and right sides.

(C) Beams The beams 33a, 33b, and 33c are members for supporting the tube 11ab. The beam 33a is bridged between the handles 32, 32. The beam 33b extends from the upper ends of the handles 32, 32 to the tube 11ab. The beam 33c extends from the center in the width direction of the beam 33a to the tube 11ab. The tube 11ab is fixed to the beams 33a, 33b, and 33c. That is, the introduction member 11 a is fixed to the support frame 30.

(D) Leg part The leg part 34 is a part which becomes the leg of the support frame 30. As shown in FIGS. 3 and 5, the leg portions 34 are provided on both sides in the width direction of the support frame 30. The leg 34 has a function of changing the height position of the entire molding mechanism 11 with respect to the main body frame 97a. Specifically, by operating a screw 34d described later, the height position of the plate member 31 can be gradually changed with a width of about 4 mm in the vertical direction.

  As shown in FIGS. 3 to 5, the leg 34 is provided on the lower surface of the plate member 31. The leg portions 34 are disposed on both sides of the plate member 31 in the width direction. The leg 34 extends in the front-rear direction of the bag making and packaging machine 100. The leg 34 is placed on a slide rail provided on the main body frame 97a. A user standing in front of the bag making and packaging machine 100 grasps the handles 32 and 32 and slides the leg portion 34 along the slide rail, whereby the introduction member 11a and the former 11b supported by the support frame 30 are moved in the front-rear direction. Moving. That is, by moving the leg portion 34 along the slide rail, the entire molding mechanism 11 moves as a unit in the front-rear direction.

  As shown in FIGS. 8 and 9, the leg portion 34 is mainly composed of a first leg member 34a, a second leg member 34b, and a wedge 34c. FIG. 8 is an enlarged view of the right leg 34 toward the front of the bag making and packaging machine 100 (see FIG. 5). The left leg 34 has the same configuration as the right leg 34. 9 is a cross-sectional view taken along the line IX-IX in FIG. In addition, in order to fix the planar position of the first leg member 34a and the second leg member 34b, the longitudinal direction center of the first leg member 34a and the second leg member 34b is along the height direction of the leg portion 34. A shaft (not shown) is passed.

(D-1) First Leg Member The first leg member 34 a is a member that constitutes the upper end portion of the leg portion 34. The upper surface of the first leg member 34a contacts the plate member 31 as shown in FIG. Specifically, the upper surface of the first leg member 34 a is joined to the lower surface of the plate member 31.

  The first leg member 34 a has a length dimension substantially equal to the length dimension of the plate member 31 in the front-rear direction. As shown in FIG. 9, the first leg member 34 a has different thickness dimensions along the longitudinal direction. In other words, an inclined surface having a different inclination with respect to the horizontal plane is formed along the longitudinal direction at the lower end of the first leg member 34a. Specifically, the first leg member 34a has the largest thickness dimension near the center in the longitudinal direction. The thickness dimension of the first leg member 34a gradually decreases from the vicinity of the center toward both ends in the longitudinal direction. In other words, on the lower end side of the first leg member 34a, an inclined surface is formed that inclines upward from the vicinity of the center toward both ends in the depth direction.

(D-2) Second Leg Member The second leg member 34 b is a member that constitutes the lower end portion of the leg portion 34. The lower surface of the second leg member 34b contacts the slide rail. The upper surface of the second leg member 34b is adjacent to the first leg member 34a via a wedge 34c described later.

  The second leg member 34b has a length dimension substantially equal to the length dimension of the plate member 31 in the front-rear direction. As shown in FIG. 9, the second leg member 34 b has different thickness dimensions along the longitudinal direction. In other words, an inclined surface having a different inclination with respect to the horizontal plane is formed along the longitudinal direction at the upper end of the second leg member 34b. Specifically, the second leg member 34b has the largest thickness dimension near the center in the longitudinal direction. The thickness dimension of the second leg member 34b gradually decreases from the vicinity of the center toward both ends in the longitudinal direction. In other words, on the upper end side of the second leg member 34b, an inclined surface is formed that inclines downward from the vicinity of the center toward both ends in the depth direction.

(D-3) Wedge The wedge 34c is a member used when adjusting the overall height of the leg 34. The wedge 34c is sandwiched between the first leg member 34a and the second leg member 34b. The wedges 34c are disposed at both ends of the leg 34 in the longitudinal direction. In other words, the pair of wedges 34 c and 34 c are arranged on the front side and the back side of the bag making and packaging machine 100.

  The wedge 34c has different thickness dimensions in the longitudinal direction. Specifically, in the longitudinal direction, the wedge 34c has a large thickness at the first end, and a small thickness at the second end opposite to the first end. Further, the wedge 34c has surfaces having the same inclination as the inclined surfaces of the first leg member 34a and the second leg member 34b on the upper surface and the lower surface, respectively. The wedge 34c has a first end portion with a large thickness dimension located in the vicinity of the longitudinal end portion of the leg portion 34, and a second end portion with a small thickness dimension located in the longitudinal center portion of the leg portion 34. It arrange | positions between the 1 leg member 34a and the 2nd leg member 34b.

  A screw 34d is passed through the pair of wedges 34c, 34c. The screw 34d is passed through the pair of wedges 34c and 34c along the longitudinal direction (depth direction) of the leg portion 34. The pair of wedges 34c, 34c approaches or moves away from the center in the longitudinal direction of the leg portion 34 as the screw 34d is tightened or loosened. When the pair of wedges 34c, 34c move in the front-rear direction with respect to the longitudinal center of the leg portion 34, the height position of the first leg member 34a contacting the upper surface of the pair of wedges 34c, 34c varies, As a result, the height position of the plate member 31 is also changed. In other words, the height of the entire molding mechanism 11 is lowered by loosening the screw 34d, and the height of the entire molding mechanism 11 is increased by tightening the screw 34d. As a result, the height positions of the members (the introduction member 11a and the former 11b) supported by the support frame 30 are changed.

  As a specific configuration, for example, the screw 34d has a spiral groove cut in the opposite direction with respect to the vicinity of the center in the longitudinal direction. Further, in the longitudinal direction of the screw 34d, when a clockwise (first direction) groove is cut in the front part from the vicinity of the center, the counterclockwise direction (second direction) in the rear part from the vicinity of the center. ) Is cut. That is, the user operates the screw 34d of the leg portion 34 located on both the left and right sides at one end side in the longitudinal direction of the leg portion 34 to move the wedge 34c on the one end side in the depth direction and at the same time the wedge on the other end side. 34c is moved in the direction opposite to the moving direction of the wedge 34c on one end side.

(3-2) Pull-down belt mechanism The pull-down belt mechanism 12 is a mechanism that sucks and transports the tubular film Fc wound around the tube 11ab downward. For example, as shown in FIG. 2, the pull-down belt mechanism 12 is provided on both the left and right sides of the tube 11ab. The pull-down belt mechanism 12 mainly includes a belt 12a having an adsorption function, a driving roller 12b that rotates the belt 12a, and a driven roller 12c. The drive roller 12b is driven by a drive motor (not shown). When the driving roller 12b is driven, the tubular film Fc is conveyed downstream while being adsorbed.

(3-3) Vertical Seal Mechanism The vertical seal mechanism 13 is configured to heat the overlapping portion of the tubular film Fc wound around the tube 11ab while pressing the overlapping portion of the tubular film Fab against the tube 11ab with a constant pressure. It is a mechanism for heat-sealing the part in the vertical direction.

  As shown in FIGS. 1 to 5, the vertical seal mechanism 13 is arranged along the longitudinal direction of the tube 11 ab on the front side of the bag making and packaging machine 100. The vertical sealing mechanism 13 includes a heater and a heater belt that is heated by the heater and contacts an overlapping portion of the tubular film Fc. Further, the vertical seal mechanism 13 is provided with a drive device (not shown). The drive device moves the heater belt closer to or away from the tube 11ab.

(3-4) Shutter Mechanism As shown in FIG. 2, the shutter mechanism 14 is disposed below the pull-down belt mechanisms 12 and 12 and the vertical seal mechanism 13 and above a horizontal seal mechanism 15 described later. The shutter mechanism 14 is supported by the main body 97.

  The shutter mechanism 14 is a mechanism that suppresses the biting of the article C into a portion to be sealed formed by a lateral seal mechanism 15 described later. The shutter mechanism 14 is composed of a pair of shutter members. The pair of shutter members are disposed before and after the tubular film Fc, and extend longer than the dimension of the tubular film Fc in a direction intersecting the extending direction of the tubular film Fc. The pair of shutter members sandwich the tubular film Fc earlier than a sealing jaw of the lateral sealing mechanism 15 described later, and suppress the fall of the packaged object above the portion to be sealed when the tubular film Fc is laterally sealed. The pair of shutter members are driven by an actuator (not shown).

(3-5) Horizontal Seal Mechanism The horizontal seal mechanism 15 is thermally sealed in a direction (lateral direction) orthogonal to the conveyance direction of the tubular film Fc, whereby the upper seal portion SL1 and the lower seal portion SL2 are attached to the tubular film Fc. It is a mechanism that forms. The lateral seal mechanism 15 is supported by the main body 97. The horizontal seal mechanism 15 is disposed below the shutter mechanism 14.

  The lateral sealing mechanism 15 mainly includes a pair of sealing jaws incorporating a heater. The pair of seal jaws are located on the front side and the rear side of the tubular film Fc. The pair of seal jaws move so as to approach and separate from each other, and sandwich the tubular film Fc. The pair of sealing jaws is in the state of being closest to each other, contacts a portion (sealed portion) that becomes the upper seal portion SL1 or the lower seal portion SL2 of the tubular film Fc, and heats the sealed portion with a heater. One of the pair of sealing jaws incorporates a cutter (not shown). The cutter cuts the center in the height direction of the seal part. By cutting the sealing portion with the cutter, one bag B is cut off from the subsequent cylindrical film Fc. That is, the seal part is cut by the cutter, so that the seal part is divided into the upper seal part SL1 and the lower seal part SL2.

(3-6) Spreader mechanism The spreader mechanism 16 is a mechanism that widens the vicinity of the lower seal portion SL2 of the tubular film Fc in which the lower seal portion SL2 is formed in the depth direction and forms a bottom-shaped portion below the tubular film Fc. (See FIG. 2). The bottom-shaped portion is a portion having a rectangular cross-sectional shape orthogonal to the conveyance direction of the tubular film Fc. Specifically, the bottom shape portion is a rectangular surface formed by the main body portion FL in the vicinity of the seal portion. That is, the spreader mechanism 16 deforms the internal space below the tubular film Fc into a shape close to a rectangle.

  As shown in FIGS. 3 to 5, the spreader mechanism 16 mainly includes a column base portion 61, a spreader 62, an air cylinder 63, an opening / closing amount adjustment mechanism (adjustment mechanism) 64, and an extension member 65.

(3-6-1) Column base part The column base part 61 is located between the side plate 823 when the second pushing and bending mechanism 18 described later is driven and the side part EP of the bag lower part FA is pushed and bent. This is the part that sandwiches the side part EP and the central part CP of the bag lower part FA (see FIGS. 30, 31, and 33C).

  Here, the bag lower portion FA means a lower end portion of the tubular film Fc after the lower seal portion SL2 is pushed and bent by a first pushing and bending mechanism 17 described later. In other words, the bag lower part FA means the lower end part of the tubular film Fc before the bottom part FB. As shown in FIG. 33C, the bag lower part FA is a part including the lower seal part SL2 and a part of the main body part. Specifically, the bag lower portion FA includes a lower seal portion SL2, a first adjacent surface S1 ', a second adjacent surface S2', and a third adjacent surface S3 '. The bag lower part FA includes a side part EP and a center part CP. The side part EP is a part located at both ends in the longitudinal direction of the bag lower part FA. Specifically, the side portion EP includes the longitudinal end portion of the lower seal portion SL2 and the third adjacent surface S3 '. The central portion CP is a portion sandwiched between the side portions EP in the longitudinal direction of the bag lower portion FA. Specifically, the center portion CP includes a longitudinal center portion of the lower seal portion SL2, a first adjacent surface S1 ', and a second adjacent surface S2'.

  As shown in FIGS. 3 to 5, the column base 61 is located below the tube 11ab. Specifically, the column base 61 is attached to the lower end of the spreader 62. More specifically, the column base portion 61 is attached to the lower end portion of the fixing member 623 included in the spreader 62. The column base 61 is located on both sides of the tube 11ab in the width direction. That is, the column base part 61 is attached to the lower end of the fixing member 623 so as to be positioned on both sides in the width direction of the tubular film Fc.

  The column base 61 has a horizontal bottom surface. When the second pushing / bending mechanism 18 described later is driven and the side plate 823 moves to the lower position, the center portion CP and the side portion EP of the bag lower portion FA are pressed against the bottom surface by the side plate 823. In other words, the bottom surface of the column base 61 sandwiches the central portion CP of the bag lower FA and a part (first portion) of the side portion EP of the bag lower FA between the side plate 823.

(3-6-2) Spreader The spreader 62 is a unit that widens the vicinity of the lower seal portion SL2 of the tubular film Fc in the depth direction. The spreader 62 mainly includes an opening / closing leg 621, a tension applying member 622, a fixing member 623, a moving member 624, and a link mechanism 625 (see FIGS. 10A to 11B).

  Hereinafter, the configuration of the spreader 62 will be described with reference to FIGS. 10A to 21. 10A and 11A are external perspective views of the spreader 62. FIG. 12 and 13 are views of the spreader 62 viewed from the right side of the bag making and packaging machine 100. FIG. 14 and 15 are views of the spreader 62 viewed from the front side of the bag making and packaging machine 100. FIG. 10A, 12, and 14 show the spreader 62 when the pair of opening / closing legs 621 and 621 are closed. On the other hand, FIG. 11A, FIG. 13, and FIG. 15 show the spreader 62 when the pair of opening / closing legs 621 and 621 are in the open state. 10B and 11B are views in which the tension applying member 622 and the attachment plate of the tension adding member 622 are removed from FIGS. 10A and 11A. 16 to 18 show the configuration of the opening / closing leg 621. 19 to 21 are diagrams for explaining the link mechanism 625.

  The spreader 62 widens the vicinity of the lower seal portion SL2 of the tubular film Fc in the depth direction when the pair of opening / closing legs 621 and 621 are in the open state. When the pair of opening / closing legs 621, 621 is in the open state, the opening degree of the pair of opening / closing legs 621, 621 is the largest. Further, the spreader 62 widens the vicinity of the lower seal portion SL2 of the tubular film Fc in the width direction when the pair of opening / closing legs 621 and 621 are closed. When the pair of opening / closing legs 621, 621 are in the closed state, the opening degree of the pair of opening / closing legs 621, 621 is the smallest.

(A) Opening / closing leg The opening / closing leg 621 is a member that contacts the vicinity of the lower seal portion SL2 of the tubular film Fc. The opening / closing leg 621 is a member made of stainless steel. As shown in FIGS. 10B and 11B, the opening / closing leg 621 has a predetermined length downward from the lower side of the tube 11ab. The open / close legs 621 are disposed on both sides of the tube 11ab in the width direction. The opening / closing leg 621 is supported by a fixing member 623, which will be described later, by a lower connecting shaft 625c. The open / close leg 621 is supported by a moving member 624, which will be described later, by a connecting plate 625a and an upper connecting shaft 625b. The open / close legs 621 function in pairs. Specifically, the pair of opening / closing legs 621 and 621 disposed on both sides in the width direction of the tube 11ab are driven by a link mechanism 625 described later to switch between an open state and a closed state. Specifically, the open state is a state in which the lower ends of the pair of opening / closing legs 621 and 621 are open (a state in the most distant position). Further, the closed state is a state in which the lower ends of the pair of opening / closing legs 621 and 621 are closed (a state in the closest position). When the pair of opening / closing legs 621 and 621 are in the open state, the lower end of the tubular film Fc is pushed out from the inside to the outside (front-rear direction). As a result, the cross section at the lower end of the tubular film Fc is formed into a rectangle. In other words, when the pair of opening / closing legs 621 and 621 are opened, a bottom-shaped portion is formed at the lower end of the tubular film Fc.

  As shown in FIGS. 16 to 18, the open / close legs 621 have different inclinations and different thicknesses in the vertical direction. Specifically, the opening / closing leg 621 has a facing surface that faces the tubular film Fc from the inside. Specifically, as shown in FIG. 16, the opposing surfaces include a first opposing surface 6211 that faces the inner surface in the depth direction of the tubular film Fc, and a second surface that faces the inner surface in the width direction of the tubular film Fc. The opposite surface 6212 is included. An angle R is attached to the corner formed by the first facing surface 6211 and the second facing surface 6212. In other words, the corner formed by the first facing surface 6211 and the second facing surface 6212 is rounded.

(A-1) 1st opposing surface The 1st opposing surface 6211 has three parts which have different inclination with respect to the centerline CL1 (refer FIG. 10B, FIG. 11B, and FIG. 17). The center line CL1 means a line extending in the vertical direction between the pair of opening / closing legs 621 and 621. The pair of opening / closing legs 621 and 621 have a symmetrical shape with respect to the center line CL1. The pair of opening / closing legs 621 and 621 move symmetrically with respect to the center line CL1.

  As shown in FIG. 17, the three portions of the first facing surface 6211 include a root portion 621aa, an intermediate portion 621ab, and a contact portion 621ac. The root portion 621aa is a portion located on the uppermost side among the three portions. The intermediate part 621ab is an intermediate part among the three parts, and is a part that connects the root part 621aa and the contact part 621ac. The contact part 621ac is a part located on the lowermost side among the three parts. That is, the contact portion 621ac is the lower end portion of the opening / closing leg 621. The contact portion 621ac is a portion that contacts the inner surface in the depth direction of the tubular film Fc. In other words, the contact portion 621ac is a portion that contacts the inner surface of the tubular film Fc located on the front side or the back side when the bag making and packaging machine 100 is viewed from the front. The contact portion 621ac has a surface that is substantially vertical when the opening / closing leg 621 is changed to the inclination of the open state. That is, the inclination of the contact portion 621ac is substantially parallel to the center line CL1 when the open / close leg 621 is in the open state. Further, when the contact portion 621ac is in contact with the inner surface of the tubular film Fc, the other portions 621aa and 621ab do not contact the tubular film Fc. The contact portion 621ac has a shape that does not damage the tubular film Fc when it comes into contact with the tubular film Fc. Specifically, corners R are attached to the upper and lower ends of the contact portion 621ac. In other words, the first facing surface 6211 of the opening / closing leg 621 has a shape in which the contact portion 621ac continues smoothly from the intermediate portion 621ab, and the lower end of the contact portion 621ac has a rounded shape.

(A-2) 2nd opposing surface The 2nd opposing surface 6212 has three parts in a different distance position from virtual line CL2 (refer to Drawing 14, Drawing 15, and Drawing 18). The virtual line CL2 is a virtual line provided to indicate the thickness dimension of the opening / closing leg 621. As shown in FIGS. 14, 15, and 18, the imaginary line CL2 is assumed to be at a position on the inner side in the width direction of the tube 11ab in the thickness direction of the opening / closing leg 621. That is, the surface of the opening / closing leg 621 adjacent to the virtual line CL2 is a surface on the opposite side of the second facing surface 6212.

  The three portions of the second facing surface 6212 also include a route portion 621ba, an intermediate portion 621bb, and a contact portion 621bc, as shown in FIG. The root part 621ba is a part located on the uppermost side among the three parts. The root part 621ba has an inclination parallel to the virtual line CL2 at a position closest to the virtual line CL2. The middle portion 621bb is a middle portion of the three portions, and is a portion connecting the root portion 621ba and the contact portion 621bc. That is, the intermediate part 621bb has a predetermined inclination with respect to the virtual line CL2. The intermediate part 621bb has a surface inclined so as to gradually move away from the virtual line CL2. The contact portion 621bc is a portion located on the lowermost side among the three portions. That is, the contact portion 621bc is a lower end portion of the opening / closing leg 621. The contact portion 621bc is a portion that contacts the inner surface in the width direction of the tubular film Fc. In other words, the contact portion 621bc is a portion that contacts the inner surface of the tubular film Fc located on the side when the bag making and packaging machine 100 is viewed from the front. The contact portion 621bc has a plane that is inclined parallel to the virtual line CL2 at a position farthest from the virtual line CL2. In other words, even when the contact portion 621bc is in contact with the inner surface of the tubular film Fc, the other portions 621ba and 621bb do not contact the tubular film Fc. The contact portion 621bc also has a shape that does not damage the tubular film Fc when it comes into contact with the tubular film Fc. Specifically, corners R are also attached to the upper and lower ends of the contact portion 621bc. That is, the second facing surface 6212 of the opening / closing leg 621 has a shape in which the contact portion 621bc continues smoothly from the intermediate portion 621bb, and the lower end of the contact portion 621bc has a rounded shape.

(B) Tension applying member The tension adding member 622 is a member that applies tension from the inside to the side surface of the tubular film Fc. Specifically, the tension applying member 622 has a cylindrical shape so that wrinkles are not formed in the upper seal portion SL1 and the lower seal portion SL2 when the upper seal portion SL1 and the lower seal portion SL2 are formed by the above-described lateral seal mechanism 15. It is a member that applies tension to the side of the film Fc.

  The tension applying members 622 are disposed below the tube 11ab and are disposed on both sides of the tube 11ab in the left-right direction. Specifically, the tension applying member 622 is disposed outside the above-described opening / closing leg 621 with respect to the center in the width direction of the tube 11ab (see FIGS. 14 and 15). The tension applying member 622 is disposed at the center of the pair of opening / closing legs 621 and 621 and extends downward (see FIGS. 12 and 13). The tension applying member 622 is a plate member made of stainless steel. The tension applying member 622 has elasticity.

  The tension applying member 622 switches between a non-contact state and a contact state according to the open / closed state of the pair of open / close legs 621 and 621. The non-contact state is a state in which the tension applying member 622 extends substantially in the vertical direction due to its own weight. In other words, in the non-contact state, the tension applying member 622 has the downstream end and the upstream end in substantially the same plane. At this time, the downstream end of the tension applying member 622 is located farthest from the side of the tubular film Fc. That is, the tip of the tension applying member 622 is at the position farthest from the portion that becomes the side surface S3 of the bag B. On the other hand, the contact state is a state where the tip on the lower end side of the tension applying member 622 contacts the side of the tubular film Fc from the inside. In other words, in the contact state, the tip of the tension applying member 622 is at a position closest to the portion that becomes the side surface S3 of the bag B. That is, in the contact state, the tension applying member 622 moves (swings) the distal end portion on the downstream side and pushes the width direction side portion of the tubular film Fc outward.

  The tension applying member 622 is in a contact state when the pair of opening / closing legs 621 and 621 are in a closed state, and applies tension to the side portion in the width direction of the tubular film Fc from the inside (FIGS. 10A and 12). And FIG. 14). On the other hand, the tension applying member 622 is in a non-contact state when the pair of opening / closing legs 621 and 621 are in the open state, and the downstream end moves to the farthest position from the side in the width direction of the tubular film Fc (see FIG. 11A, FIG. 13 and FIG. 15). The tension applying member 622 is brought into contact with the lateral sealing mechanism 15 when it is heat-sealed in a direction (lateral direction) orthogonal to the conveyance direction of the tubular film Fc, and is placed on the side in the width direction of the tubular film Fc. Apply tension from the inside. In other words, the tension applying member 622 comes into contact with the side in the width direction of the tubular film Fc from the inside before the bottom portion FB is formed by the first push bending mechanism 17 and the second push bending mechanism 18. A tension is applied to the side in the width direction of the film Fc.

(C) Fixed member The fixed member 623 is a member that supports a moving member 624 described later. The fixing member 623 supports the moving member 624 so as to be movable relative to the tube 11ab. The fixing member 623 supports the opening / closing leg 621 by using a link mechanism 625 described later.

  The fixing member 623 is a plate member made of stainless steel that extends in the vertical direction. The fixing member 623 is inserted into the long hole 11ad formed in the tube 11ab. As described above, the height position of the upper end of the fixing member 623 is regulated by the positioning member provided inside the long hole 11ad. The fixing member 623 is fixed to the tube 11ab with a screw 623a in the vicinity of the upper end (see FIGS. 3 to 5). By fixing the fixing member 623 to the tube 11ab, the height position of the lower end of the open / close leg 621 is determined.

(D) Moving member The moving member 624 is a member supported by the fixed member 623 so as to be relatively movable as described above. The moving member 624 is connected to the air cylinder 63 via an opening / closing amount adjusting mechanism 64 described later. The moving member 624 and the opening / closing amount adjusting mechanism 64 are connected by a screw 624a (see FIGS. 3 to 5). The moving member 624 moves relative to the fixed member 623 by driving the air cylinder 63.

  In the present embodiment, the height position of the moving member 624 where the screw 624a is stopped is set as a reference height h1 for the vertical movement of the moving member 624. That is, the moving member 624 moves downward from the reference height h <b> 1 by driving the air cylinder 63. In other words, the reference height h1 of the moving member 624 changes to a height position lower than h1 by driving the air cylinder 63 (see FIGS. 19 to 21).

(E) Link mechanism The link mechanism 625 is a mechanism for transmitting the movement of the moving member 624 moved in the vertical direction by driving the air cylinder 63 to the pair of opening / closing legs 621 and 621. In other words, the link mechanism 625 is a mechanism that switches between the open and closed states of the pair of opening / closing legs 621 and 621 as the moving member 624 moves in the vertical direction (see FIG. 20). The link mechanism 625 connects each open / close leg 621 and the moving member 624.

  As shown in FIG. 10B, the link mechanism 625 mainly includes a connection plate 625a, an upper connection shaft (corresponding to a swing shaft) 625b, a lower connection shaft 625c, and a horizontal movement shaft 625d.

  The connection plate 625 a is a plate for connecting the moving member 624 and the opening / closing leg 621. The connecting plate 625a has two holes arranged vertically. The upper connecting shaft 625b is passed through the upper hole. Further, the lower connecting shaft 625c is passed through the lower hole. That is, the connecting plate 625a transmits the vertical movement of the upper connecting shaft 625b to the lower connecting shaft 625c.

  The upper connecting shaft 625b is attached to the moving member 624 through the hole above the connecting plate 625a. The upper connecting shaft 625b is configured to be movable in the vertical direction as the moving member 624 moves in the vertical direction (see arrow d1 in FIG. 20). That is, as shown in FIG. 20, when the moving member 624 moves from the height h1 to the height h1 ′ lower than the height h1, the height position of the upper connecting shaft 625b also increases from the height h2. The height changes to a height h2 ′ lower than h2.

  The lower connecting shaft 625c is attached to the open / close leg 621 through a hole below the connecting plate 625a. The lower connecting shaft 625c has a configuration that can swing as the upper connecting shaft 625b moves in the vertical direction (see FIGS. 19 and 20). That is, as the upper connecting shaft 625b moves up and down, the lower connecting shaft 625c swings with respect to the center line CL1.

  The horizontal movement shaft 625d connects the opening / closing leg 621 and the fixing member 623. The horizontal movement shaft 625d supports the inclination of the open / close leg 621 with respect to the fixed member 623 so as to be variable. Specifically, the horizontal movement shaft 625d is a shaft that moves in the horizontal direction in accordance with the movement of the lower connecting shaft 625c (see symbol h3 in FIG. 20). The horizontal movement shaft 625d moves so as to approach and separate from the center line CL1 without changing the height position (see arrow d2 in FIG. 20). Specifically, when a downward force is applied to the lower connection shaft 625c, the horizontal movement shaft 625d moves horizontally in a direction away from the center line CL1. On the other hand, the horizontal movement shaft 625d moves horizontally in a direction approaching the center line CL1 when an upward force is applied to the lower connection shaft 625c. As described above, when the moving member 624 moves in the vertical direction, the link mechanism 625 changes the inclination of the opening / closing leg 621 with respect to the fixing member 623.

(3-6-3) Air Cylinder The air cylinder 63 is a drive source for moving the moving member 624 in the vertical direction. The driving force of the air cylinder 63 is transmitted to the moving member 624 via the opening / closing amount adjusting mechanism 64. As a result, the state of the pair of opening / closing legs 621 and 621 switches between the open state and the closed state.

(3-6-4) Opening / Closing Amount Adjusting Mechanism The opening / closing amount adjusting mechanism 64 is a mechanism that adjusts the opening / closing amounts of the pair of opening / closing legs 621, 621. Specifically, the opening / closing amount adjusting mechanism 64 is a mechanism for adjusting the height position of the upper connecting shaft 625b serving as a reference axis when the pair of opening / closing legs 621, 621 is opened / closed. As shown in FIG. 22, the opening / closing amount adjustment mechanism 64 mainly includes a transmission plate (transmission unit) 641 and an adjustment plate (adjustment unit) 642.

  As shown in FIGS. 3 and 5, the transmission plate 641 is a plate-like member that extends in the width direction of the tube 11ab. The center in the width direction of the transmission plate 641 is connected to the air cylinder 63. The driving force of the air cylinder 63 is transmitted to the transmission plate 641. The transmission plate 641 transmits the driving force transmitted by the air cylinder 63 to the adjustment plate 642. The transmission plate 641 has connecting portions 641a on both sides in the width direction. The connecting portion 641a is a portion that connects the adjustment plate 642. The connecting portion 641a is a recess formed in the transmission plate 641. The connecting portion 641 a has a shape along the height direction of the transmission plate 641.

  As shown in FIGS. 3 and 4, the adjustment plate 642 is a plate-like member that extends in the front-rear direction of the tube 11ab. The adjustment plate 642 is attached to both sides of the transmission plate 641 in the width direction. Specifically, the adjustment plate 642 has one end on the front side fitted into a connecting portion (concave portion) 641a and is fixed by a fixing screw 64a and an adjustment screw 64b.

  As shown in FIG. 22, the fixing screw 64 a extends in the thickness direction of the transmission plate 641 and passes through the adjustment plate 642. The number of fixing screws 64a is arbitrary, but in the present embodiment, two fixing screws 64a are used in the height direction of the transmission plate 641. On the other hand, as shown in FIG. 22, the adjustment screw 64 b extends in the height direction of the transmission plate 641 and passes through the adjustment plate 642. Specifically, the adjustment screw 64b includes a screw (upper screw) passed from the upper end of the transmission plate 641 to the adjustment plate 642 and a screw (lower screw) passed from the lower end of the transmission plate 641 to the adjustment plate 642. .

  One end on the rear side of the adjustment plate 642 is connected to the moving member 624 by a screw 624a as shown in FIGS. Thereby, the height position (reference height h1) at which the moving member 624 is screwed is determined.

  In addition, the adjustment plate 642 can adjust the height position connected with respect to the connection part 641a. That is, the adjustment plate 642 can also adjust the height position (reference height h1) where the moving member 624 is screwed. By adjusting the reference height h1, the height position of the upper connecting shaft (corresponding to the swing shaft) 625b is also adjusted. As the reference height h1 changes, the height position h1 'of the moving member 624 after moving downward by the air cylinder 63 also changes. For example, by shifting the height position of the adjustment plate 642 downward from h1, as shown in FIG. 21, the height position of the moving member 624 after movement is a height position h1 ′ below h1 ′. Change to '. As a result, the height position after the movement of the upper connecting shaft 625b also changes to a height position h2 '' below the h2 '. As a result, the opening degree of the pair of opening / closing legs 621 and 621 also changes from θ1 to θ2 (see FIG. 21).

  Specifically, as shown in FIG. 22, the height dimension L2 of the adjustment plate 642 is smaller than the height dimension L1 of the connecting portion 641a. That is, gaps o1 and o2 can be formed above and / or below the adjustment plate 642 in the connecting portion 641a in which the adjustment plate 642 is fitted. The fitting position of the adjustment plate 642 with respect to the connecting portion 641a is adjusted by the adjustment screw 64b. Specifically, the height position of the adjustment plate is changed by adjusting the degree of tightening of the upper screw and the lower screw. More specifically, by tightening the upper screw and loosening the lower screw, the adjustment plate 642 moves downward, and the height position of the adjustment plate 642 with respect to the connecting portion 641a changes. On the other hand, by tightening the lower screw and loosening the upper screw, the adjustment plate 642 moves upward, and the height position of the adjustment plate 642 with respect to the connecting portion 641a changes.

(3-6-5) Extension member The extension member 65 is a member for extending the bottom surface of the column base 61 in the width direction of the tube 11ab. That is, the extending member 65 is disposed on both sides in the width direction of the tube 11ab. The extension member 65 is a metallic plate-like member attached to the lower end of the fixing member 623. The extension member 65 may be welded to the column base part 61. The extending member 65 extends outward with respect to the central axis of the tube 11ab. Here, the central axis of the tube 11ab is an axis that passes through the center in the width direction of the tube 11ab and extends along the longitudinal direction. The extension member 65 has a lower surface that is substantially the same height as the bottom surface of the column base 61. The lower surface of the extension member 65 is a plane.

  When the side plate 823 moves to a lower position by driving a second pushing / bending mechanism 18 described later, the center portion CP and the side portion EP of the bag lower portion FA are pressed against the lower surface of the extension member 65. It is done. Specifically, the lower surface of the extending member 65 sandwiches the central portion CP and the side portion EP near the boundary portion of the bag lower FA with the side plate 823. Here, the boundary portion is a portion that becomes a boundary between the central portion CP and the side portion EP when the side portion EP is pushed and bent by the second push-bending mechanism 18. When the side portion EP is pushed and bent by the second push-bending mechanism 18, the end portion of the extension member 65 contacts the boundary portion.

(3-7) First Push-Bending Mechanism The first push-bending mechanism 17 is configured so that the bottom seal portion SL2 is moved in the depth direction (in this embodiment, the front direction) after the bottom-shaped portion is formed at the lower end of the tubular film Fc. ) To form a bag lower part FA of the bag B on the tubular film Fc (see FIG. 33C).

  FIG. 23 is a perspective view of the first push-bending mechanism 17. FIG. 24 is a view of the first push-bending mechanism as viewed from the right side of the bag making and packaging machine. As shown in FIGS. 23 and 24, the first push-bending mechanism 17 mainly includes a bottom plate 17a and an actuator 17b. The actuator 17b moves the bottom plate 17a in the front-rear direction (in the direction of arrow D2 in FIGS. 23 and 24). The actuator 17b is controlled by a speed controller (not shown).

  The bottom plate 17a is a metal plate-like member whose surface is coated with resin. The bottom plate 17a extends in the direction D1 in which the lower seal portion SL2 extends. That is, the longitudinal direction of the bottom plate 17a coincides with the longitudinal direction of the lower seal portion SL2. The size of the bottom plate 17a in the longitudinal direction is configured to be longer than the size of the lower seal portion SL2. The bottom plate 17a has a flat surface portion 17c and an inclined portion 17s. The flat surface portion 17c is located at the center in the longitudinal direction of the bottom plate 17a and extends in the direction in which the lower seal portion SL2 extends. The plane part 17c has a plane parallel to the horizontal plane. The flat portion 17c has a portion protruding in the traveling direction at the center in the longitudinal direction. In other words, the bottom plate 17a has a pointed portion at the central portion on the front end side in the traveling direction. The inclined portions 17s are located at both end portions in the longitudinal direction of the bottom plate 17a. In addition, the inclined portion 17s is inclined with respect to the planar portion 17c. Specifically, the corner portion on the front side in the traveling direction of the bottom plate 17a is bent downward. More specifically, the one side of the front side of the traveling direction of the bottom plate 17a extends in the horizontal direction at the central portion, and both ends are inclined downward with respect to the horizontal plane as the distance from the central portion increases. That is, the inclined portion 17s is at a low height position with respect to the flat portion 17c of the bottom plate 17a.

  Furthermore, the bottom plate 17a is provided with a protrusion 17m. The protruding portion 17m is a portion protruding from above the flat portion 17c. Specifically, the protruding portion 17m has a vertical surface extending upward from the flat portion 17c of the bottom plate 17a. The vertical plane has a predetermined length in the moving direction of the bottom plate 17a. That is, the protrusion 17m has a predetermined length in the depth direction of the bottom plate 17a. In the present embodiment, a rectangular block is used as the protrusion 17m.

  The protrusion 17m forms a push-bend portion in the bag lower part FA. Here, the pushing and bending portion is a portion that is easily pushed and bent when the side portion EP of the bag lower portion FA is pushed and bent by a second pushing and bending mechanism 18 described later. Specifically, the pushing / bending portion is a portion serving as a reference line when the side portion EP is pushed and bent by the second pushing / bending mechanism 18 described later. In other words, the push-bent portion is a portion that becomes a fold (a boundary between the side portion EP and the central portion CP) of the bag lower portion FA. That is, the pushing / bending portion coincides with the boundary portion described above.

  The protruding portion 17m is disposed in the vicinity of the end portion in the longitudinal direction of the flat portion 17c. Further, the projecting portion 17m is disposed at a symmetrical position with respect to the center in the width direction of the bottom plate 17a. The protrusion 17m is provided in such a manner that it can move in the width direction of the bottom plate 17a with respect to the bottom plate 17a. That is, the distance interval between the two protrusions 17m and 17m can be changed. The height of the projecting portion 17m gradually increases from the front to the rear in the traveling direction (see FIG. 24). In other words, the height position of the upper end of the protrusion 17m gradually increases from the front side toward the rear side.

  The bottom plate 17a has a depth direction D2 that intersects the width direction D1 of the tubular film Fc after the lower portion of the tubular film Fc is pushed and spread from the inside in the depth direction (front-rear direction) by the pair of opening and closing legs 621 and 621. Move to. In other words, the bottom plate 17a moves in the depth direction D2 when a bottom-shaped portion is formed at the lower end of the tubular film Fc. The bottom plate 17a pushes and bends the lower seal portion SL2 toward the depth direction D2 of the tubular film Fc. That is, the bottom plate 17a changes the inclination (posture) of the lower seal portion SL2 with respect to the tubular film Fc. The pressed and bent lower seal portion SL2 is bonded to a part of the first adjacent surface S1 'by heat (see FIG. 25). FIG. 25 is an image view of the bottom plate 17a and the lower seal portion SL2 as viewed from below. When the bottom plate 17a moves forward, first, the front end of the flat surface portion 17c hits the lower seal portion SL2, and then the inclined portions 17s at both ends hit the lower seal portion SL2. That is, after the center of the lower seal portion SL2 is first bent by the tip of the flat portion 17c, both ends of the lower seal portion SL2 are gradually bent by the inclined portion 17s.

  As shown in FIG. 26, the depressed lower seal portion SL2 is sandwiched from above and below by the lower end surface (bottom surface) of the column base portion 61, the extension member 65, and the bottom plate 17a, and in the vicinity of the lower seal portion SL2. Are thermally welded to the surfaces S1 ′ to S3 ′ of the main body portion FL to form the bag lower portion FA. Thereafter, as shown in FIGS. 25 and 26, the projecting portion 17 m comes into contact with the side portion EP of the bag lower FA. The protruding portion 17m bends the side portion EP of the bag lower portion FA along the length direction of the protruding portion 17m. In other words, the protrusion 17m jumps up the side part EP of the bag lower part FA from below. That is, the side portion EP of the bag lower FA is temporarily pushed upward so as to form a predetermined angle with the central portion CP of the bag lower FA. The projecting portion 17m comes into contact with the side portion EP of the bag lower FA, and the side portion EP of the bag lower FA is flipped up, whereby a pushing and bending portion is formed in the bag lower FA.

(3-8) Second Push / Bend Mechanism The second push / bend mechanism 18 pushes and bends the side portion EP of the bag lower portion FA along the longitudinal direction of the lower seal portion SL2 to form a bottom portion (square bottom) on the tubular film Fc. ) A mechanism for forming the FB. As shown in FIG. 2, the second pushing / bending mechanism 18 is disposed above the lateral seal mechanism 15. The second push-bending mechanism 18 is disposed on the right side and the left side with respect to the central axis of the tube 11ab. Further, the second pushing / bending mechanism 18 operates symmetrically with respect to the central axis of the tube 11ab.

  As shown in FIGS. 27 and 28, the second push-bending mechanism 18 mainly includes a support mechanism 81 and a swing mechanism 82. FIG. 27 is a perspective view of the second push-bending mechanism 18. FIG. 28 is a view of the second push-bending mechanism 18 as viewed from the front side of the bag making and packaging machine 100.

(3-8-1) Support Mechanism The support mechanism 81 is a mechanism that is fixed to the main body 97 and movably supports the swing mechanism 82. As shown in FIG. 27, the support mechanism mainly includes a first support member 81a and a second support member 81b.

  The first support member 81a is a frame for fixing a later-described second support member 81b to the main body 97 with a predetermined inclination. The first support member 81 a is screwed to the main body 97.

  The second support member 81b is a member that is fixed to the first support member 81a and extends obliquely downward with respect to the central axis of the tube 11ab. The second support member 81 b supports the swing mechanism 82 and guides the swing mechanism 82 obliquely downward according to the driving of the air cylinder 83.

(3-8-2) Oscillating mechanism 82
The swing mechanism 82 is a mechanism that pushes and bends the side portion EP of the bag lower FA. Specifically, the swinging mechanism 82 pushes and bends the side portion EP of the bag lower FA toward the longitudinal center of the lower seal portion SL2 by swinging, and causes the side portion EP of the bag lower FA to be the central portion CP of the bag lower FA. It is a mechanism to contact with.

  The swing mechanism 82 is disposed at a standby position that is obliquely above the side portion EP of the bag lower FA before the second push-bending mechanism 18 is driven. The standby position is the position farthest from the central axis of the tube 11ab in the movement path of the swing mechanism 82. The swing mechanism 82 moves toward the swing start position that is obliquely below the standby position by driving the air cylinder 83. The swing mechanism 82 contacts the side portion EP of the bag lower FA at the swing start position or during the movement of the path toward the swing start position. The swing start position is a position closer to the central axis of the tube 11ab than the standby position in the movement path of the swing mechanism 82. Thereafter, the swing mechanism 82 starts swinging at the swing start position and pushes and bends the side portion of the bag lower FA.

  The air cylinder 83 is controlled by a speed controller (not shown). That is, the swing mechanism 82 is reciprocated up and down in an oblique direction by the air cylinder 83, and approaches and separates from the side portion EP of the bag lower FA.

  As shown in FIG. 27, the swing mechanism 82 mainly includes a slide member 821, a movement direction defining portion 822, and a side plate 823.

(A) Slide member The slide member 821 is a member that moves obliquely downward while being supported by the second support member 81b described above. An air cylinder 83 is connected to the slide member 821. That is, the driving force of the air cylinder 83 is transmitted to the slide member 821. Specifically, when the air cylinder 83 is driven, the slide member 821 moves obliquely from above to below or from below to above along the inclination of the second support member 81b. Thereby, the distance from the side plate 823 to the bag lower part FA changes.

(B) Moving direction defining part The moving direction defining part 822 is a member that defines the moving direction of the slide member 821. The moving direction defining portion 822 is a member for changing the inclination of the side plate 823 with respect to the side portion EP of the bag lower FA as the slide member 821 moves.

  The movement direction defining portion 822 is a flat plate member provided on both sides of the slide member 821 as shown in FIG. The moving direction defining portion 822 is screwed to the lower end of the second support member 81b.

  The movement direction defining portion 822 has a predetermined thickness in the depth direction. The moving direction defining portion 822 is formed with a groove cam 82 a for defining the moving direction of the slide member 821. The groove cam 82a guides the moving direction of a cam follower 82d described later. The groove cam 82a extends from the upper side to the lower side in the oblique direction toward the central axis of the tube 11ab, and then extends further downward at a different angle.

  As shown in FIGS. 27 and 28, the groove cam 82a includes a first groove p1 and a second groove p2. The first groove p1 has a first slope. The first slope has a first angle inclined upward with respect to a horizontal plane passing through a variation point cp described later (see FIG. 28). The first angle is, for example, 25 ° to 45 °. The variation point cp is a point where the inclination of the groove cam 82a changes. The second groove p2 has a second slope. The second slope has a second angle inclined downward with respect to a horizontal plane passing through the fluctuation point cp. The second angle is larger than the first angle, and is, for example, 60 ° to 80 °. When the cam follower 82d passes through the fluctuation point cp, the side plate 823 starts to swing with respect to the swinging shaft 82c (see FIGS. 30A to 30C). That is, when the cam follower 82d reaches the fluctuation point cp, the swing mechanism 82 reaches the swing start position.

  The uppermost position of the groove cam 82a is the standby point wp of the cam follower 82d. When the cam follower 82d is at the standby point wp, the side plate 823 is in the standby position before being moved downward. That is, when the cam follower 82d is at the standby point wp, the side plate 823 is at a position farthest from the central axis of the tube 11ab.

  Further, the lowest position of the groove cam 82a is the swing end point ep. When the cam follower 82d is at the swing end point ep, the side plate 823 has a posture in which the swing is finished. That is, when the cam follower 82d is at the swing end point ep, the front end of the side plate 823 is located closest to the central axis of the tube 11ab. Further, when the cam follower 82 d is at the swing end point ep, the side plate 823 is in a posture having a surface parallel to the bottom surface of the column base portion 61.

  When the cam follower 82d reaches the swing end point ep of the groove cam 82a, the side plate 823 is in the push-bending completion posture (see FIG. 30C). The pushing / bending completion posture is a posture in which the side plate 823 finishes pushing / bending the side portion EP of the bag lower FA. In other words, the push bending completion posture is a posture in which the side plate 823 is swung to the swing end position. Specifically, when the side plate 823 is in the push-bending completion posture, the upper surface and the bottom surface of the column base 61 have the same inclination. In other words, the push bending completion posture is the posture of the side plate 823 when the upper surface of the side plate 823 is parallel to the bottom surface of the column base 61.

(C) Side plate The side plate 823 is a member that directly contacts the side part EP of the bag lower part FA and pushes and bends the side part EP of the bag lower part FA. The side plate 823 is a metallic plate-like member having a resin applied to the surface. The side plate 823 extends in the depth direction (front-rear direction) of the tubular film Fc. The side plate 823 changes the posture with respect to the bag lower portion FA by swinging with respect to the swing shaft 82c.

  The side plate 823 is connected to the movement direction defining portion 822 by the arm portion 82b. As shown in FIG. 27, the arm part 82b is located on both sides of the side plate 823 in the depth direction. The arm part 82 b extends upward from the side plate 823. The side plate 823 is connected to the lower end of the arm portion 82b. A cam follower 82d is provided at the upper end of the arm portion 82b. The cam follower 82d is attached toward the outside in the depth direction of the side plate 823. That is, the cam followers 82d are located at both ends of the side plate 823 in the depth direction, and are inserted into the groove cam 82a from the inside of the movement direction defining portion 822. The cam follower 82d moves along the groove cam 82a. A swing shaft 82c is provided at the center of the arm portion 82b. The swing shaft 82c supports the side plate 823 so as to be swingable with respect to the slide member 821. That is, as the slide member 821 moves, the side plate 823 swings up and down with respect to the swing shaft 82c.

  The side plate 823 includes a base portion (first pressing portion) 823a and a rising portion (second pressing portion) 823b.

  The base portion 823a is a portion of the side plate 823 that is in a push-bending completion posture and is far from the central axis of the tubular film Fc. In other words, the base portion 823a is provided on the rear side in the traveling direction of the side plate 823.

  The base portion 823a is a portion having a rectangular flat portion extending in the depth direction of the tubular film Fc. An elastic body 823c is attached to the base portion 823a. In this embodiment, the elastic body 823c is attached to the center of the base portion 823a in the depth direction, but the elastic body 823c may be attached to the entire base portion 823a. Specifically, the elastic body 823c is fluororubber. The elastic body 823c is in a position corresponding to the bottom surface of the column base portion 61 in the push bending completion posture. The base part 823a is mainly an elastic body 823c and contacts the side part EP of the bag lower part FA. In other words, the elastic body 823c is attached to the base portion 823a in order to enhance adhesion and prevent contact when the side portion EP and the center portion CP of the bag lower FA are sandwiched between the column base portion 61.

  The base portion 823a extends horizontally at the first height position when in the push-bending completion posture. Further, the elastic body 823c extends horizontally at the second height position h4 (see FIG. 31) (see FIG. 31) in the push-bending completion posture. The second height position h4 is a position slightly higher than the first height position. The base portion 823a (particularly, the elastic body 823c) is in a pushing / bending completion posture, and a portion (first portion) close to the pushing / bending portion (boundary portion) of the side portion EP of the bag lower FA is a central portion of the bag lower FA. Press against the bottom surface of the CP and the column base 61.

  The rising portion 823b is a portion raised from the end portion in the width direction of the base portion 823a. The rising portion 823b is a portion of the side plate 823 that is in a push-bending completion posture and is closer to the central axis of the tubular film Fc than the base portion 823a. In other words, the rising portion 823b is provided on the front side in the traveling direction of the side plate 823. That is, the rising portion 823b is a portion that is provided on the side of the side plate 823 in the traveling direction and protrudes from the base portion 823a and the surface of the elastic body 823c attached to the base portion 823a. The base portion 823a (and the elastic body 823c) and the rising portion 823b have an L-shaped cross-sectional shape (see FIG. 28).

  The rising portion 823b also extends in the depth direction of the tubular film Fc. The rising portion 823b has a linear contact surface in plan view. In the present embodiment, the rising portion 823b protrudes in the direction in which the center in the depth direction approaches the center axis of the tubular film Fc. In other words, the rising portion 823b has a convex portion at the center in the depth direction of the tubular film Fc in plan view. Specifically, the rising portion 823b has a V-shaped portion at the center in the depth direction in plan view. The side plate 823 pushes up the side portion EP while contacting the vicinity of the center in the depth direction of the side portion EP at the V-shaped portion of the rising portion 823b.

  The rising portion 823b extends horizontally at the third height position h4 '(see FIG. 31) in the push-bending completion posture. The third height position h4 'is a position higher than the first height position and the second height position. The third height position h4 'is about 5 mm to about 15 mm higher than the second height position h4. The rising portion 823b is in a pressing and bending completion posture, and presses a portion (second portion) farther from the pressing and bending portion than the first portion of the side portion EP of the bag lower FA to the central portion CP of the bag lower FA. In other words, the rising portion 823b presses the second portion, which is the tip portion of the side portion EP of the bag lower FA with respect to the first portion, against the central portion CP of the bag lower FA.

(4) Control Unit As shown in FIG. 29, the control unit 90 includes a CPU 91, a ROM 92, a RAM 93, an HDD (hard disk) 94, and the like. The control unit 90 reads and executes a program for controlling each part of the bag making and packaging machine 100. As shown in FIG. 29, the control unit 90 is connected to the film supply unit 2, the components included in the bag making and packaging unit 10, and the operation panel 95. Specifically, the configuration included in the bag making and packaging unit 10 includes a pull-down belt mechanism 12, a vertical sealing mechanism 13, a shutter mechanism 14, a horizontal sealing mechanism 15, a spreader mechanism 16, a first pushing and bending mechanism 17, and a second. This is a push-bending mechanism 18. The control unit 90 sends a control command to the drive unit of the film supply unit 2 and the drive unit of the bag making and packaging unit 10 based on the contents set on the operation panel 95 or the like. The control unit 90 receives state values and the like from the film supply unit 2 and the bag making and packaging unit 10.

(5) Bag making operation (5-1) Overall operation Along with driving of the pull-down belt mechanisms 12, 12, the sheet-like film Fs is fed from the film roll of the film supply unit 2 and sent to the forming mechanism 11. The sheet-like film Fs sent to the forming mechanism 11 is wound around the outer surface of the tube 11ab while passing through the gap between the former 11b and the tube 11ab, and both sides of the film Fs in the width direction are overlapped. The film Fs on which both sides in the width direction are overlapped is conveyed downward by the pull-down belt mechanisms 12 and 12 along the outer surface of the tube 11ab. The overlapped portion of the film Fs is heat-sealed in the vertical direction by the vertical sealing mechanism 13, and the sheet-like film Fs becomes a cylindrical film Fc.

  Next, the tubular film Fc is heat-sealed by the lateral sealing mechanism 15 to form a sealed portion. The shutter mechanism 14 sandwiches the tubular film Fc earlier than the lateral seal mechanism 15 and suppresses the fall of the packaged object above the portion to be sealed when the tubular film Fc is laterally sealed. The portion to be sealed is cut by a cutter built in one of the sealing jaws to become the upper seal portion SL1 of the preceding bag B and the lower seal portion SL2 of the tubular film (subsequent bag B). That is, the preceding bag B and the tubular film Fc (following bag B) are separated by the sealing jaw (see FIG. 2).

  After the preceding bag B is cut off from the tubular film Fc, a bottom-shaped portion is formed at the lower end of the tubular film Fc. Specifically, the lower end of the tubular film Fc is spread in the front-rear direction by the spreader mechanism 16.

  Thereafter, the bottom plate 17a of the first push-bending mechanism 17 approaches the tubular film Fc and pushes and bends the lower seal portion SL2 in a direction (front-rear direction) intersecting with the direction in which the lower seal portion SL2 extends (left-right direction). . Thereby, bag lower part FA is formed in cylindrical film Fc (refer to Drawing 33C).

  Further, the second push-bending mechanisms 18, 18 push and bend the side portions EP, EP of the bag lower FA in the direction (left-right direction) in which the lower seal portion SL2 extends. The side portions EP and EP are thermally welded to the central portions CP and CP in the vicinity of the side portions EP and EP by the residual heat of the lower seal portion SL2. Thereby, the bottom part FB is formed in the cylindrical film Fc.

  The mass of the article C falls from the combination weighing machine 200 immediately before the bottom portion FB is formed or immediately after the bottom portion FB is formed. Thereafter, a sealed portion is further formed on the tubular film Fc by the sealing jaw. That is, a location that becomes the upper seal portion SL1 of the preceding bag B and the lower seal portion SL2 of the subsequent bag B is formed in the tubular film Fc. The portion to be sealed is cut by a cutter built in one of the sealing jaws to become the upper seal portion SL1 of the preceding bag B and the lower seal portion SL2 of the subsequent bag B. That is, the preceding bag B and the tubular film Fc (following bag B) are separated by the sealing jaw (see FIG. 2). The bag B is separated from the tubular film Fc and falls.

(5-2) Detailed Operation Next, the operation of each component when the bottom portion FB is formed on the tubular film Fc will be described in detail with reference to FIGS. 30 and 31. FIG. 30 shows how the second push-bending mechanism 18 pushes and bends the side portion EP. Specifically, FIG. 30A shows a state in which the side plate 823 pushes and bends the side portion EP downward. FIG.30 (b) shows a mode that the side plate 823 pushes and bends the side part EP upward after FIG.30 (a). FIG. 30C shows a state in which the side plate 823 pushes and bends the side portion EP further upward after FIG. 30B to bring the side portion EP into contact with the central portion CP. That is, FIG. 30C shows the side plate 823 in the push-bending completion posture. FIG. 31 is a partially enlarged view of FIG.

  When the pair of opening and closing legs 621 and 621 are opened (see FIGS. 11A, 13 and 15), a bottom-shaped portion is formed at the lower end of the tubular film Fc. When the bottom-shaped portion is formed at the lower end of the tubular film Fc, the first push-bending mechanism 17 drives the actuator to move the bottom plate 17a forward in the depth direction (see arrow D2 in FIG. 25). Accordingly, the lower seal portion SL2 is bent forward. Thereby, bag lower part FA is formed in the lower end of cylindrical film Fc (refer to Drawing 33C). Thereafter, the pair of opening / closing legs 621 and 621 maintain an open state. The first push-bending mechanism 17 moves the bottom plate 17a backward (rear side in the depth direction).

  Thereafter, as shown in FIGS. 30A to 30C, the second push-bending mechanism 18 moves the cam follower 82d along the groove cam 82a, so that the side portion of the bag lower FA is moved from the front end of the side plate 823. While changing the distance to the EP, the posture of the side plate 823 is changed.

  Specifically, until the cam follower 82d reaches the fluctuation point cp from the standby point wp, the side plate 823 has a posture inclined greatly downward with respect to the horizontal plane, as shown in FIG. The side plate 823 comes into contact with the side portion EP at the rising portion 823b at the tip position, and pushes and bends the side portion EP downward as shown in FIG.

  Thereafter, when the cam follower 82d moves from the change point cp toward the swing end point ep, the side plate 823 gradually changes its posture as shown in FIG. Specifically, the side plate 823 gradually changes in inclination with respect to the horizontal plane. In other words, the side plate 823 swings and gradually moves the rising portion 823b upward.

  Thereafter, when the cam follower 82d reaches the swing end point ep, the side plate 823 assumes a pushing / bending completion posture (see FIGS. 30C and 31). When the side plate 823 is in the pushing and bending completion posture, the plane of the elastic body 823c attached to the base portion 823a is at the same height position h4 as the height position of the central portion CP of the bag lower FA (see FIG. 31). ). Further, when the side plate 823 is in the pushing and bending completion posture, the rising portion 823b is at a position h4 'higher than the height position of the central portion CP of the bag lower FA (see FIG. 31). The side plate 823 sandwiches the side part EP and the center part CP of the bag lower part FA between the elastic body 823c and the bottom part of the column base part 61 in a pushing and bending completion posture. That is, the side plate 823 is in a pushing and bending completion posture, and the rising portion 823b temporarily pushes the tip of the side portion EP to the height position h4 ′ above the height position h4 of the other central portion CP. The tip of the part EP is strongly pressed against the central part CP. At this time, the tip of the side portion EP is welded to the central portion CP by applying force from the rising portion 823b and the central portion CP. Thereby, the bottom part FB is formed in the lower end part of the cylindrical film Fc.

(6) Features (6-1)
In the bag making and packaging machine 100 according to the above-described embodiment, the pair of opening / closing legs 621 is swung so that the opening degree of the pair of opening / closing legs (leg portions) 621, 621 is increased. The vicinity of the seal portion is widened in the depth direction, and a bottom-shaped portion is formed below the tubular film Fc. The pair of opening / closing legs 621 and 621 swings about an upper connecting shaft (swing shaft) 625b. The bag making and packaging machine 100 includes an opening / closing amount adjustment mechanism (adjustment mechanism) 64 for adjusting the opening degree of the pair of opening / closing legs 621 and 621. The opening / closing amount adjustment mechanism 64 includes an adjustment plate (adjustment unit) 642 that changes the height position of the upper connecting shaft 625b. The bag making and packaging machine 100 adjusts the opening degree of the pair of opening / closing legs 621 and 621 by changing the height position of the upper connecting shaft 625b. Thereby, a highly self-supporting bag can be manufactured stably.

  In general, in order to improve the self-supporting property of the bag B, it is necessary to form a bottom FB having a good shape. The shape of the bottom portion FB changes according to the opening degree of the pair of opening / closing legs 621 and 621. That is, in order to form the bottom FB having a good shape, the pair of opening / closing legs 621 and 621 are required to be widened to have a predetermined opening degree. Specifically, when the opening degree of the pair of opening / closing legs 621 and 621 is maximized, the opening degree needs to be a predetermined opening degree. However, due to variations in the parts constituting the spreader 62, the opening degree of the pair of opening / closing legs 621 and 621 may not be a predetermined opening degree. As a result, the bottom FB having a good shape cannot be formed and the self-supporting ability may be lowered.

  However, since the bag making and packaging machine 100 according to the above embodiment can adjust the opening degree of the pair of opening and closing legs 621 and 621, it is possible to stably manufacture a bag having high self-supporting property.

(6-2)
In the bag making and packaging machine 100 according to the embodiment, the spreader 62 includes a fixed member 623, a moving member 624, and a link mechanism 625. The fixing member 623 is fixed to the tube 11ab. The moving member 624 extends in the direction in which the tube 11ab extends, and is attached to the fixing member 623 so as to be relatively movable. The link mechanism 625 connects the moving member 624 and the upper connecting shaft (swinging shaft) 625b, and transmits the movement of the moving member 624 to the upper connecting shaft 625b. Further, the adjustment plate (adjustment unit) 642 changes the height position of the upper connecting shaft 625b by changing the height position of the moving member 624. That is, in the bag making and packaging machine 100 according to the above embodiment, the position of the reference height h1 of the moving member 624 attached so as to be relatively movable with respect to the fixed member 623 is changed, and the height position of the upper connecting shaft 625b is changed. To change. Thereby, the opening degree of a pair of opening-and-closing leg 621,621 can be adjusted in the state which attached the spreader 62 to the tube 11ab.

(6-3)
In the bag making and packaging machine 100 according to the above embodiment, the opening / closing amount adjustment mechanism 64 includes a transmission plate (transmission portion) 641. The transmission plate 641 transmits the driving force from the air cylinder 63 to the adjustment plate (adjustment unit) 642. Moreover, the transmission plate 641 has a connection part (concave part) 641a. The connecting portion 641 a extends in the moving direction of the moving member 624 and connects the adjustment plate 642. The adjustment plate 642 can adjust the height position connected to the connecting portion 641a. The bag making and packaging machine 100 according to the above embodiment has a configuration in which the height position of the moving member 624 is changed by adjusting the height position of the adjustment plate 642 connected to the connection portion 641a. As a result, the opening degrees of the pair of opening / closing legs 621 and 621 can be easily adjusted.

(6-4)
In the bag making and packaging machine 100 according to the above-described embodiment, the tube 11ab includes a flat surface, a side surface, and a notch forming surface. A flat surface is located in the front side of the bag making packaging machine 100, and is extended in an up-down direction. The side surfaces are positioned on both sides of the flat surface and extend in the vertical direction. The notch forming surface is a surface that is located on the back side of the bag making and packaging machine 100 and has a part that is partially cut out on a surface extending in the vertical direction. In addition, elongated holes 11ad and 11ad extending vertically and an introduction path ip sandwiched between the elongated holes 11ad and 11ad are formed inside the tube 11ab.

  In general, in a bag making and packaging machine that forms a square-bottom bag, a full tube is used to facilitate attachment of each component necessary for manufacturing the square-bottom bag (for example, a mechanism corresponding to a spreader mechanism). Is used. Here, the full tube is a tube having a shape in which all the introduction paths for introducing the article into the cylindrical film are covered. However, full tubes are prone to clogging of articles inside the tube. In particular, when a bag making and packaging machine is operated at a high speed, articles are frequently jammed inside the tube. Therefore, it is difficult to improve the operating rate of the bag making and packaging machine.

  However, in the bag making and packaging machine 100 according to the above embodiment, the tube 11ab has a notch forming surface. In addition, elongated holes 11ad and 11ad extending vertically and an introduction path ip sandwiched between the elongated holes 11ad and 11ad are formed inside the tube 11ab. In addition, the introduction path ip for introducing the article C into the tubular film Fc is not completely covered in the vertical direction. As a result, even when the bag making and packaging machine 100 is operated at high speed, clogging of the article C inside the tube 11ab can be suppressed. Thereby, the operation rate of the bag making packaging machine 100 can be improved.

(6-5)
In the bag making and packaging machine 100 according to the above embodiment, the opening / closing leg 621 has a first facing surface 6211 facing the inner surface in the depth direction of the tubular film Fc and a first facing surface 6211 facing the inner surface in the width direction of the tubular film Fc. Two opposing surfaces 6212. When the pair of opening / closing legs 621 and 621 is in the open state, the first facing surface 6211 and the second facing surface 6212 of each opening / closing leg 621 are in contact with the tubular film Fc only at the lower ends thereof. It is shaped to spread the lower part. Specifically, the first facing surface 6211 includes a root portion 621aa, an intermediate portion 621ab, and a contact portion 621ac having different inclinations with respect to the center line CL1, and the second facing surface 6212 is a virtual line CL2. A route portion 621ba, an intermediate portion 621bb, and a contact portion 621bc, which are located at different distance positions. The open / close leg 621 is in an open state, and only the contact portions 621ac and 621bc are in contact with the tubular film Fc.

  When the member that pushes down the lower portion of the tubular film Fc is a member that is uniformly inclined with respect to the center line CL1 or at a uniform distance position with respect to the imaginary line CL2, it is between the tubular film Fc. In some cases, the frictional force generated locally causes a portion that is not a desired place to be caught locally. As a result, it is difficult to form the bottom FB having a beautiful shape.

  However, in the bag making and packaging machine 100 according to the above embodiment, the opening / closing leg 621 has a shape such that only the lower end (contact portions 621ac, 621bc) contacts the tubular film Fc when in the open state. Specifically, the opening / closing leg 621 contacts the lower part of the tubular film Fc at four points (see p11 to p14 in FIG. 32). Thereby, the frictional resistance generated between the tubular film Fc and the opening / closing leg 621 can be reduced, and the bottom portion FB having a beautiful shape can be surely formed. Further, R is formed at the corners of the contact portions 621ac and 621bc. Therefore, when forming the bottom part FB, the possibility of damage to the tubular film Fc can be reduced.

(6-6)
In the bag making and packaging machine 100 according to the embodiment, the extending member 65 is provided to extend the bottom surface of the column base 61 in the width direction of the tube 11ab. The extension member 65 has a lower surface that is substantially the same height as the bottom surface of the column base 61.

  Thereby, when the side part EP of the bag lower part FA is pushed and bent by the side plate 823 and the side part EP of the bag lower part FA is welded to the center part CP of the bag lower part FA, the side part EP and the center are wide on the vertical direction. The part CP can be sandwiched. As a result, the side portion EP can be reliably welded to the central portion CP.

  In addition, a beautiful edge can be formed on the bottom portion FB by pressing the distal end of the extension member 65 against the push-bending portion and pressing and bending the side portion EP with reference to the distal end of the extension member 65.

(6-7)
In the bag making and packaging machine 100 according to the above-described embodiment, the support frame 30 includes the leg portions 34 that are mechanisms for changing the height position of the entire molding mechanism 11 with respect to the main body frame 97a. Thereby, the distance interval from the front-end | tip of the opening-and-closing leg 621,621 to the horizontal seal | sticker mechanism 15 can be adjusted.

  In order to form the bottom FB having a beautiful shape, the distance interval from the distal ends of the open / close legs 621 and 621 to the lateral seal mechanism 15 is important. That is, it is preferable that the distance interval from the front ends of the open / close legs 621 and 621 to the lateral seal mechanism 15 is set to a predetermined distance interval. However, due to individual differences in the parts constituting the bag making and packaging machine 100, the distance between the end of the opening / closing legs 621 and 621 and the lateral seal mechanism 15 may not be a desired distance after assembling the parts. is there. As a result, the opening degree of the opening / closing legs 621 and 621 does not become a desired opening degree, and as a result, it becomes difficult to form the bottom part FB having a beautiful shape.

  Therefore, in the bag making and packaging machine 100 according to the above embodiment, the distance interval from the front ends of the opening / closing legs 621 and 621 to the lateral seal mechanism 15 can be adjusted by operating the screw 34d provided on the leg portion 34. Was provided. Thereby, the distance interval from the front-end | tip of the opening-and-closing leg 621,621 to the horizontal seal | sticker mechanism 15 can be set to the desired distance interval. As a result, a beautiful bottom FB can be formed on the tubular film Fc.

(7) Modification (7-1) Modification A
In the bag making and packaging machine 100 according to the above-described embodiment, the support frame 30 includes the leg portion 34 that is a mechanism for changing the height position of the entire molding mechanism 11 with respect to the main body frame 97a. The leg portion 34 has a wedge 34c. The configuration of the leg portion 34 may be another configuration instead of the configuration using the wedge 34c. That is, the leg part 34 is not limited to the wedge 34c as long as it has a mechanism capable of adjusting the height.

(7-2) Modification B
In the bag making and packaging machine 100 according to the above embodiment, the legs for changing the height position of the entire molding mechanism 11 with respect to the main body frame 97a in order to adjust the distance interval from the lateral seal mechanism 15 to the tips of the opening and closing legs 621 and 621. A portion 34 was provided.

  Here, instead of the configuration in which the distance between the horizontal seal mechanism 15 and the ends of the open / close legs 621 and 621 is adjusted by the leg portion 34, the height adjustment of the member that sandwiches the tubular film Fc above the horizontal seal mechanism 15 is performed. You may be able to perform. Specifically, in the bag making and packaging machine 100 according to the above-described embodiment, the shutter mechanism 14 is disposed above the lateral seal mechanism 15. Therefore, a configuration capable of adjusting the height position of the shutter mechanism 14 may be provided. Alternatively, a block or a plate-like member that sandwiches the tubular film Fc may be separately provided above the horizontal seal mechanism 15 or the shutter mechanism 14. Alternatively, the height dimension of the shutter member may be changed. That is, instead of the configuration in which the distance between the horizontal seal mechanism 15 and the tips of the opening / closing legs 621 and 621 is adjusted by adjusting the height of the leg portion 34, the tubular film Fc is disposed above the horizontal seal mechanism 15. It is also possible to adopt a configuration in which the transport route is changed. Also by this, the bottom part FB of a preferable shape can be formed.

(7-3) Modification C
The bag making and packaging machine 100 according to the above embodiment may further include an air jet for inflating the tubular film Fc before the lower portion of the tubular film Fc is expanded in the depth direction by the pair of opening and closing legs 621 and 621. Good. The air jet reduces the frictional force generated on the contact surface between the pair of opening / closing legs 621 and 621 and the tubular film Fc. The air jet is driven when the pair of opening and closing legs 621 and 621 are in a closed state, and is expanded immediately after the pair of opening and closing legs 621 and 621 are changed to an open state.

  In order to form the bottom FB having a beautiful shape, the pair of opening / closing legs 621 and 621 are tubular so that the lower seal portion SL2 extends in the direction perpendicular to the depth direction near the center of the tubular film Fc in the depth direction. It is preferable to spread the lower part of the film Fc in the depth direction (see FIG. 32). However, when the frictional force generated on the contact surface between the pair of opening / closing legs 621 and 621 and the tubular film Fc is large, the inner surface (inner surface) of the tubular film Fc is likely to be caught on the opening / closing leg 621. Then, the position where the pair of opening / closing legs 621 and 621 contact and push the tubular film Fc is shifted from the preferred position, and as a result, it becomes difficult to form the bottom FB having a beautiful shape.

  However, by inflating the tubular film Fc before the pair of opening and closing legs 621 and 621 contact the tubular film Fc by the air jet, the frictional force generated on the contact surface is reduced and the bottom portion FB having a suitable shape is formed. can do.

2 Film supply unit 10 Bag making and packaging unit 11 Molding mechanism 11a Introducing member 11ab Funnel member 11ab Tube 11b Former 12 Pull-down belt mechanism 13 Vertical sealing mechanism 14 Shutter mechanism 15 Horizontal sealing mechanism 16 Spreader mechanism 17 First push-bending mechanism 17a Bottom plate 17b Actuator 17c Plane portion 17s Inclined portion 17m Protruding portion 18 Second push-bending mechanism 30 Support frame 31 Plate member 32 Handles 33a, 33b, 33c Beam 34 Leg portion 34a First leg member 34b Second leg member 34c Wedge 61 Column base 62 Spreader 621 Opening / closing leg 622 Tension applying member 623 Fixed member 624 Moving member 625 Link mechanism 625a Connecting plate 625b Upper connecting shaft (oscillating shaft)
625c Lower connection shaft 625d Horizontal movement shaft 63 Air cylinder 64 Opening / closing amount adjustment mechanism (adjustment mechanism)
64a Fixing screw 64b Adjustment screw 641 Transmission plate (transmission part)
641a Connecting part 642 Adjustment plate (adjustment part)
65 Extension member 81 Support mechanism 82 Oscillation mechanism 821 Slide member 822 Movement direction defining portion 823 Side plate 823a Base portion (first pressing portion)
823b Rising part (second pressing part)
90 control unit 97 main body 97a main body frame 100 bag making and packaging machine C article (packaged article)
Fs Sheet-like film (wrapping material)
Fc tubular film (tubular packaging)
B Flat bottom type bag SL2 Lower seal part FA Lower part FB Bottom part EP (Lower part of the bag) Side CP (Lower part of the bag) Central part

JP 2012-136270 A

Claims (3)

A molding mechanism for winding a sheet-like packaging material around a tube and molding it into a cylinder;
The cylindrical packaging material is sealed so as to intersect with the extending direction of the cylindrical packaging material, and a seal portion extending in the width direction of the cylindrical packaging material is formed on the cylindrical packaging material. A sealing mechanism to
A pair of legs that are positioned inside the cylindrical packaging material and swing in the depth direction that intersects the width direction to change the opening; A spreader that spreads the vicinity of the seal portion in the depth direction by swinging a leg portion to form a bottom-shaped portion in the cylindrical packaging material;
A drive unit that swings the pair of legs, an air cylinder that switches between an open state in which the opening is the largest and a closed state in which the opening is the smallest;
A first push-bending mechanism that forms a bag lower portion of the bag including a part of the seal part and the main body part by pushing and bending the seal part in the depth direction;
A second push-bending mechanism that pushes and bends the side portion of the bag lower portion including the longitudinal end portion of the seal portion along the longitudinal direction of the seal portion to form a bottom portion in the cylindrical packaging material;
An adjustment mechanism for adjusting the opening of the pair of legs,
The spreader is
A rocking shaft that is a center for rocking the pair of legs,
The adjustment mechanism is
Including an adjustment unit for changing a height position of the swing shaft;
Bag making and packaging machine. The spreader is
A fixing member fixed to the tube;
A moving member that extends in a direction in which the tube extends and is attached to be movable relative to the fixed member;
A link mechanism for connecting the moving member and the swinging shaft, and transmitting the movement of the moving member to the swinging shaft;
Further including
The adjustment unit is
By changing the height position of the moving member, the height position of the swing shaft is changed.
The bag making and packaging machine according to claim 1. The adjustment mechanism is
A transmission unit that transmits the driving force of the air cylinder to the adjustment unit;
The transmission unit is
A connecting portion that extends in a moving direction of the moving member and connects the adjusting portion;
The adjusting unit is capable of adjusting a height position connected to the connecting unit.
The bag making and packaging machine according to claim 1 or 2.

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