JP2012136277A - Bag-making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag-making and packaging machine, the flat-bottom-bag productivity per unit time of which is enhanced.SOLUTION: The bag-making and packaging machine 1 includes a lateral seal mechanism 56, a first bending member 50, and second bending members 81, and makes a flat bottom bag B2. The lateral seal mechanism 56 heat-seals a tubular packaging material Fc in a lateral direction to form a lower seal SL2. The first bending member 50: moves to a first position where the member 50 pushes down the lower seal SL2 in a direction crossing a direction in which the lower seal SL2 extends; and bends the lower seal SL2 to part of a body FL2 of the bag B2 to form a bag lower part FA. The bag lower part FA is a lower part of the bag including the lower seal SL2 and part of the body FL2. The second bending members 81: move to second positions where the members 81 push down sides EP of the bag lower part FA in a direction in which the lower seal SL2 extends, while the first bending member 50 is at the first position; and heat-seals the sides EP while bending the sides EP to their vicinities CP of the bag lower part FA.

Description

  The present invention relates to a bag making and packaging machine for producing flat bottom bags.

  2. Description of the Related Art Conventionally, a bag making and packaging machine has been used as a device for filling and packaging an article to be packaged such as confectionery in a bag while manufacturing the bag. In recent years, bag making and packaging machines for producing self-supporting bags are often used because of the ease of displaying products and the display effect.

  For example, in a bag making and packaging machine described in Patent Document 1 (Japanese Patent Laid-Open No. 2000-335511), a gusset-type bag is manufactured as a self-supporting bag. The bag making and packaging machine forms a lower seal portion of the bag by thermally sealing the cylindrical packaging material in the lateral direction while forming a gusset on the cylindrical packaging material. Thereafter, the bottom portion of the bag is formed by heat-sealing while folding the lower seal portion with respect to the main body portion of the bag using an L-shaped bending member.

  On the other hand, when a flat bottom bag as shown in FIG. 14 is manufactured as a self-supporting bag, the method of Patent Document 1 cannot form an appropriate bottom portion of the bag.

  A bag making and packaging machine according to Japanese Patent Application No. 2010-291076 (hereinafter referred to as Patent Document 2) by the present applicant includes a first folding member and a second folding member. The first bending member bends the lower seal portion with respect to a part of the main body portion of the bag by moving the lower seal portion to the first position where the lower seal portion is pushed down in a direction intersecting with the extending direction of the lower seal portion, thereby forming the lower portion of the bag. To do. The bag lower part is a lower part of the bag including a lower seal part and a part of the main body part of the bag. The second folding member moves to the second position where the lower side of the bag is pushed down in the direction in which the lower seal portion extends after the first folding member is retracted from the first position to another position. The part is heat-sealed while being bent with respect to its vicinity. The side part at the bottom of the bag is the side part at the bottom of the bag in the direction in which the lower seal part extends. The vicinity of the lower part of the bag is a part of the lower part of the bag that is close to the side part of the lower part of the bag. Therefore, according to the bag making and packaging machine of Patent Document 2, it is possible to manufacture a flat bottom type bag having an appropriate bottom portion.

  However, in the bag making and packaging machine of Patent Document 2, after the operation of bending the lower seal portion of the bag with respect to a part of the main body portion of the bag, the operation of bending the side portion of the lower portion of the bag with respect to the vicinity thereof is executed. Therefore, the time required to form the bottom of the bag cannot be sufficiently shortened, and the productivity of the bag per unit time is limited.

  The subject of this invention is providing the bag making packaging machine which can improve the productivity of the flat bottom type bag per unit time.

  A bag making and packaging machine according to a first aspect of the present invention includes a lateral seal mechanism, a first bending member, and a second bending member, and manufactures a bag. The main bag includes a main body portion that surrounds the packaged object, and upper and lower seal portions and a lower seal portion above and below the main body portion. The horizontal sealing mechanism heat seals the cylindrical packaging material in the horizontal direction to form an upper seal portion and a lower seal portion. A 1st bending member bend | folds a lower seal part with respect to a part of main-body part by moving to a 1st position which pushes down a lower seal part in the direction which cross | intersects the direction where a lower seal part extends, and forms a bag lower part. The bag lower part is the lower part of the bag including the lower seal part and a part of the main body part. The second folding member is moved to the second position where the side part of the lower part of the bag is pushed down in the direction in which the lower seal part extends while the first bending member is in the first position, so that the side part is adjacent to the lower part of the bag. Heat-sealing while bending the part. The side part at the bottom of the bag is the side part at the bottom of the bag in the direction in which the lower seal part extends. The vicinity of the lower part of the bag is a part of the lower part of the bag that is close to the side part of the lower part of the bag.

  Here, at the time of forming the bottom of the flat bottom type bag, the operation of bending the lower seal portion of the bag with respect to a part of the main body portion of the bag and the operation of bending the side portion of the lower portion of the bag with respect to the vicinity thereof are simultaneously performed. Done. Note that both operations are performed at the same time means that the operations overlap at least partially. Accordingly, the productivity of flat bottom bags per unit time can be improved.

  The bag making and packaging machine according to the second aspect of the present invention is the bag making and packaging machine according to the first aspect, wherein the first folding member is in contact with the vicinity of the end of the lower seal part, and the vicinity of the end. The whole lower seal part is bent with respect to a part of the main body part by pushing down. The vicinity of the end of the lower seal portion is the vicinity of the end of the lower seal portion in the direction in which the lower seal portion extends.

  Here, the first bending member pushes down the vicinity of the end portion of the lower seal portion of the bag. In other words, the first folding member is located below the bag and in the vicinity of the lateral end of the bag at the first position. On the other hand, a 2nd bending member pushes down the side part of a bag lower part. In other words, the second bending member is present in the second position below the bag and near the lateral end of the bag. Here, it is possible to avoid interference between the first and second bending members that are close to each other during each bending operation.

  The bag making and packaging machine according to the third aspect of the present invention is the bag making and packaging machine according to the second aspect, wherein the first folding member does not contact any part of the lower seal part other than the vicinity of the end part. .

  Here, the first bending member contacts the vicinity of the end portion of the lower seal portion and pushes down the vicinity of the end portion, but does not contact the vicinity of the middle of the lower seal portion (near the center of the direction in which the lower seal portion extends). As a result, the entire lower seal portion of the bag can be reliably bent with respect to a part of the main body portion of the bag while reducing resistance due to contact between the packaging material and the first bending member. As a result, the beauty of the bag can be maintained.

  A bag making and packaging machine according to a fourth aspect of the present invention is the bag making and packaging machine according to any one of the first to third aspects, wherein the first bending member is a second one at the first position. The second bending member at the position is surrounded by the bent side portion and the vicinity portion.

  Here, a 1st bending member is enclosed in the clearance gap formed between the side part of the bag lower part which faces each other, and the vicinity part of the bag lower part which is not heat-sealed. Accordingly, the first bending member in the first position does not hinder the bending operation and the heat sealing operation by the second bending member.

  A bag making and packaging machine according to a fifth aspect of the present invention is the bag making and packaging machine according to any one of the first to fourth aspects, wherein the second bending member is in the first position. By pushing down the side part along the bending member, the side part is bent with respect to the vicinity.

  Here, the second bending member is bent while the side portion of the lower portion of the bag is applied to the first bending member at the first position. As a result, the side part of the lower part of the bag can be folded beautifully along the crease.

  The bag making and packaging machine according to a sixth aspect of the present invention is the bag making and packaging machine according to any one of the first to fifth aspects, wherein the second folding member has a contact surface with the packaging material. A recess that is recessed from is formed. The first bending member enters the recess at the first position.

  Here, a concave portion is formed on the surface of the second bending member facing the packaging material. And the 1st bending member in the 1st position enters into the crevice of the 2nd bending member in the 2nd position. Accordingly, it is possible to reliably avoid interference between the first bending member at the first position and the second bending member at the second position.

  A bag making and packaging machine according to a seventh aspect of the present invention is the bag making and packaging machine according to any one of the first to fifth aspects, further comprising a cradle. The cradle is disposed inside the cylindrical packaging material, and comes into contact with the second bending member at the second position across the side portion and the vicinity thereof. A recess that is recessed from the contact surface with the second bending member is formed in the cradle. The first bending member enters the recess at the first position.

  Here, a recess is formed on the surface of the cradle that faces the second bending member. And the 1st bending member in a 1st position enters into the crevice of a cradle. Therefore, it is possible to reliably avoid interference between the first bending member in the first position and the cradle.

  The bag making and packaging machine according to the eighth aspect of the present invention is the bag making and packaging machine according to any of the first to seventh aspects, wherein the second folding member is at the time of stopping the production of the bag, Stopping at the second position, the manufacture of the bag is resumed, and waiting is performed at the second position until the packaging material falling from above reaches the lower part of the bag.

  Here, when the manufacture of the bag is resumed, the packaging object falls from above to the lower part of the bag with the second folding member supporting the lower part of the bag from below. Therefore, the lower seal portion of the bag manufactured at the first bag when the manufacturing of the bag is resumed is not damaged by the impact of the fall of the packaged item.

  The bag making and packaging machine according to the ninth aspect of the present invention is the bag making and packaging machine according to any of the first to eighth aspects, wherein the first folding member is at the time of stopping the production of the bag, It stops at the first position, and the production of the bag is resumed, and it waits at the first position until the packaging material falling from above reaches the lower portion of the bag.

  Here, when the manufacture of the bag is resumed, the packaging object falls from above to the lower part of the bag with the first folding member supporting the lower part of the bag from below. Therefore, the lower seal portion of the bag manufactured at the first bag when the manufacturing of the bag is resumed is not damaged by the impact of the fall of the packaged item.

  According to the bag making and packaging machine of the present invention, at the time of forming the bottom of the flat bottom type bag, the lower seal portion of the bag is bent with respect to a part of the main body portion of the bag, and the side portion of the lower portion of the bag is The operation of bending the vicinity is simultaneously performed. Accordingly, the productivity of flat bottom bags per unit time can be improved.

1 is an external perspective view of a bag making and packaging machine according to an embodiment of the present invention. The schematic side view of a bag making packaging machine. The schematic perspective view of a bag making packaging machine. The figure which shows a guide mechanism, a 2nd bending mechanism, and a horizontal sealing mechanism. The side view of the guide mechanism of the closed state. The side view of the guide mechanism of the open state. Schematic of a horizontal seal mechanism. Schematic of a horizontal movement mechanism. The figure which shows a 1st seal jaw, a 2nd seal jaw, and a rotation mechanism. (A), (b) The figure which shows a motion of the 1st seal jaw. (A), (b) The figure which shows a motion of the 2nd seal jaw. The control block diagram of a bag making packaging machine. The rear view of a pillow-type bag. (A) The perspective view of a flat bottom type bag. (B) Bottom view of flat bottom bag. The bottom view of a bag lower part. The figure which shows the motion of a guide mechanism. The figure which shows the motion of a guide mechanism. The figure which shows the motion of a 1st bending mechanism. The figure which shows the motion of a 2nd bending mechanism. (A), (b), (c) The figure which shows the motion of a 2nd bending mechanism. (A) The bottom view of the bottom plate and bag lower part in a 1st advance position. (B) The bottom view of the bottom plate and bag in a 1st advance position. The figure which shows the guide mechanism at the time of formation of the bottom part of a bag, a side plate, and a bottom plate. The figure which shows a guide mechanism. The flowchart which shows the flow of a process at the time of the stop of the manufacturing operation of a bag. The figure which shows an origin adjustment mechanism. The figure which shows the guide mechanism at the time of formation of the bottom part of a bag based on a modification, a side plate, and a bottom plate. The bottom view of the bottom plate and bag lower part in the 1st advance position concerning a modification.

  Hereinafter, the bag making packaging machine 1 which concerns on one Embodiment of this invention is demonstrated, referring drawings. Note that “upper”, “lower”, “left”, “right”, “front”, and “rear” in the description of the bag making and packaging machine 1 are defined as shown in FIG.

(1) Whole structure The whole structure of the bag making packaging machine 1 is shown in FIG.1 and FIG.2. The bag making and packaging machine 1 is a machine that manufactures a product P in which an article C such as a snack is packed. The bag making and packaging machine 1 includes a bag making and packaging unit 5 that packs the articles C, a film supply unit 6 that supplies the film F that is the material of the bags B1 and B2 of the product P to the bag making and packaging unit 5, And a control unit 7 (see FIG. 12) for controlling the overall operation of the bag making and packaging machine 1. The article C to be packed in the bag making and packaging unit 5 is weighed by the combination weighing machine 2 disposed above the bag making and packaging unit 5. The bag making and packaging unit 5 packs the article C in line with the timing when the article C is supplied from the combination weighing machine 2.

  On the front surface of the bag making and packaging unit 5, an operation panel 8 facing the right side is arranged. The operation panel 8 includes a liquid crystal display and a touch panel that covers the liquid crystal display, and displays information indicating an operation state of the bag making and packaging machine 1 to an operator standing on the right side of the bag making and packaging machine 1. The input of various commands to the bag making and packaging machine 1 is accepted.

  The bag making and packaging machine 1 forms a sheet-like film F supplied from the film supply unit 6 into a tubular film Fc by forming the sheet-like film F into a tubular shape by a forming mechanism 51 described later. Thereafter, bags B1 and B2 are manufactured by heat-sealing predetermined positions of the tubular film Fc in the vertical direction and the horizontal direction by a vertical sealing mechanism 53 and a horizontal sealing mechanism 56, which will be described later.

(2) Detailed structure (2-1) Film supply unit The film supply unit 6 is a unit which supplies the sheet-like film F with respect to the shaping | molding mechanism 51 which the bag making packaging unit 5 mentions later. The film supply unit 6 is disposed adjacent to the bag making and packaging unit 5. A film roll around which the film F is wound is set in the film supply unit 6. The film F is fed out from the film roll and supplied to the forming mechanism 51.

(2-2) Bag Making and Packaging Unit As shown in FIGS. 1 to 3, the bag making and packaging unit 5 includes a forming mechanism 51, pull-down belt mechanisms 52 and 52, a vertical seal mechanism 53, a guide mechanism 54, It has a horizontal seal mechanism 56, a first folding mechanism 57, a second folding mechanism 58, an origin adjusting mechanism 59, and a support frame 12 that supports these mechanisms. The bags manufactured by the bag making and packaging unit 5 include a pillow type bag B1 as shown in FIG. 13 and a flat bottom type bag B2 as shown in FIG.

  As shown in FIG. 13, the pillow-type bag B1 includes a bag body portion FL1 that surrounds the article C, an upper seal portion SL1 that closes the upper side of the bag body portion FL1, and a lower seal portion that closes the lower side of the bag body portion FL1. SL2. A vertical seal portion LSP extending in the vertical direction is formed on the back surface of the bag B1.

  As shown in FIG. 14, the flat bottom bag B2 is a self-supporting bag having a bottom portion FB. The bag B2 includes a bag body portion FL2 that surrounds the article C, an upper seal portion SL1 that closes the upper side of the bag body portion FL2, and a lower seal portion SL2 that closes the lower side of the bag body portion FL2. A vertical seal portion LSP extending in the vertical direction is formed on the back surface of the bag B2. The bag body portion FL2 has a first surface S1 having a vertical seal portion LSP, a second surface S2 facing the first surface S1, and side surfaces S3 and S3 sandwiched between the first surface S1 and the second surface S2. . In the present embodiment, no crease is formed at the boundary between the first surface S1 and the second surface S2, and the side surfaces S3 and S3, and the vicinity of the boundary is smoothly curved. In other words, no gusset is formed in the bag B2. The bottom portion FB mainly includes a lower seal portion SL2 and lower portions of the first surface S1, the second surface S2, and the side surfaces S3 and S3.

(2-2-1) Forming mechanism The forming mechanism 51 forms the sheet-like film F sent from the film supply unit 6 into a cylindrical shape. As shown in FIGS. 2 and 3, the forming mechanism 51 includes a tube 11a and a former 11b.

(2-2-1-1) Tube The tube 11a is a cylindrical member extending in the vertical direction, and has openings at the upper and lower ends. The tube 11a is disposed at the central opening of the top plate 29 of the support frame 12, and is integrated with the former 11b via a bracket (not shown). The opening at the upper end of the tube 11a has a funnel shape. As shown in FIG. 3, the article C falling from the combination weighing machine 2 (see FIG. 1) by a predetermined amount is thrown through the funnel-shaped opening and falls through the inside of the tube 11a. The combination weighing machine 2 includes a feeder, a pool hopper, a lightweight hopper, and a collective discharge chute.

(2-2-1-2) Former The former 11b is arranged so as to surround the tube 11a. The shape of the former 11b is such that the film F is wound around the outer surface of the tube 11a while passing through the gap between the former 11b and the tube 11a, and is formed from a sheet shape to a cylindrical shape. The former 11b is also fixed to the support frame 12 via a support member (not shown).

(2-2-2) Pull-down belt mechanism The pull-down belt mechanisms 52 and 52 are supported by a support member (not shown) suspended from the top plate 29 of the support frame 12. As shown in FIG. 3, the pull-down belt mechanisms 52 and 52 are arranged symmetrically with respect to the tube 11a. The pull-down belt mechanisms 52 and 52 extend in the vertical direction along the tube 11a and convey the tube film Fc wound around the tube 11a while adsorbing the tubular film Fc. The pull-down belt mechanisms 52 and 52 include driving rollers 21 and 21, driven rollers 22 and 22, and belts 23 and 23 having a suction function, respectively.

(2-2-3) Vertical Seal Mechanism The vertical seal mechanism 53 is supported by a support member (not shown) that is suspended from the top plate 29 of the support frame 12, and extends vertically along the tube 11a. It extends.

  As shown in FIG. 3, the vertical sealing mechanism 53 heats the overlapping portion of the tubular film Fc wound around the tube 11 a while pressing the tube 11 a against the tube 11 a with a constant applied pressure in the vertical direction. The vertical seal mechanism 53 includes a heater and a heater belt that is heated by the heater and contacts an overlapping portion of the tubular film Fc.

(2-2-4) Guide Mechanism As shown in FIG. 3, the guide mechanism 54 is disposed between the tube 11 a and the lateral seal mechanism 56. The guide mechanism 54 spreads the tubular film Fc in the depth direction (front-rear direction) from the inside after the lower seal portion SL2 is formed on the tubular film Fc by the lateral seal mechanism 56 when the bag B2 is manufactured.

  As shown in FIGS. 4, 5, and 23, the guide mechanism 54 includes guide members 41 and 41, rotation mechanisms 42 and 42, pressing portions 43 and 43, transmission mechanisms 44 and 44, and a pressing mechanism 45. , 45, L-shaped members 46, 46, and spreaders 47, 47.

(2-2-4-1) Guide member The guide members 41 and 41 are attached to the front and rear of the lower end portion of the tube 11a. Each of the guide members 41 and 41 has an inverted U-shape. In other words, each of the guide members 41 and 41 seems to have a substantially rectangular plate-like member that is appropriately bent and cut out from the center to the lower side. Have a different shape. That is, the guide members 41, 41 have four leg tip portions 41a,... (See FIGS. 17 and 18). As will be described later, the guide members 41 and 41 come into contact with the tubular film Fc from the inside, but the contact area with the tubular film Fc is reduced by this notch. As a result, the frictional resistance between the guide members 41 and 41 and the tubular film Fc is reduced, and the durability of the tubular film Fc is improved. Further, the article C that has fallen inside the tube 11 a is less likely to be clogged in the guide mechanism 54 due to this notch. Furthermore, the guide members 41 and 41 are reduced in weight by this notch, and the force required to open and close the guide members 41 and 41 described later is reduced.

  The cylindrical film Fc that has been transported to the guide members 41 and 41 while wrapping the tube 11a is transported further downward along the guide members 41 and 41 while wrapping the guide members 41 and 41.

(2-2-4-2) Rotation Mechanism As shown in FIGS. 5 and 6, the rotation mechanisms 42 and 42 are attached near the upper ends of the guide members 41 and 41, respectively. 41 is a rotation axis. The rotation mechanisms 42 and 42 rotate the guide members 41 and 41 symmetrically with respect to the center line of the tube 11a. As a result, the leg tip portions 41a,... Facing each other in the front-rear direction move in directions opposite to each other and approach and separate. In the state where the leg tip portions 41a,... Facing each other in the front-rear direction are separated from each other (the guide members 41, 41 are opened), the tubular film Fc enclosing the guide members 41, 41 is It is pushed and expanded in the depth direction (front-rear direction) from the inside by the portions 41a,.

(2-2-4-3) Pressing part The pressing parts 43 and 43 are attached to the vicinity of the left end and the right end of the guide members 41 and 41, respectively. The pressing portions 43 and 43 operate transmission mechanisms 44 and 44 described later by being pressed by pressing mechanisms 45 and 45 described later, respectively. The pressing parts 43, 43 are made of stainless steel.

(2-2-4-4) Transmission mechanism The transmission mechanisms 44 and 44 transmit the pressing force acting on the pressing portions 43 and 43 to the rotating mechanisms 42 and 42, respectively, and guide the guide members 41 and 41 to the center of the tube 11a. Rotate symmetrically around the line.

(2-2-4-5) Pressing mechanism The pressing mechanisms 45 and 45 are mechanisms that press the pressing portions 43 and 43, respectively. The pressing mechanism 45 is constituted by, for example, an air cylinder which is a kind of reciprocating actuator, and is controlled by a speed controller (not shown). In a state where the pressing mechanisms 45, 45 are not pressing the pressing portions 43, 43, as shown in FIG. 5, the guide members 41, 41 extend substantially vertically due to their own weight (the guide members 41, 41 are closed). State). On the other hand, when the pressing mechanisms 45 and 45 are pressing the pressing portions 43 and 43, the guide members 41 and 41 are opened as shown in FIG. The depth dimension (the dimension in the front-rear direction) of the bag B2 can be adjusted by the opening amount L of the guide members 41, 41. The pressing mechanisms 45 and 45 are made of rubber or resin, and noise due to contact with the pressing portions 43 and 43 is reduced.

(2-2-4-6) L-shaped member L-shaped members 46 and 46 are arranged inside guide members 41 and 41 as shown in FIG. The L-shaped members 46 and 46 include shaft portions 46a and 46a, and pedestals 46b and 46b that are continuous with the lower ends of the shaft portions 46a and 46a, respectively. The shaft portions 46a and 46a extend in the vertical direction in the vicinity of the left and right portions of the guide members 41 and 41, respectively. The cradle 46b, 46b extends in the left-right direction. The lower end surfaces of the pedestals 46b and 46b receive pressure applied from the side plates 81 and 81 at the second forward position, which will be described later, respectively, and the film F (specifically, end portions EP, EP and The adjacent portions CP1, CP1) are sandwiched between the side plates 81, 81.

(2-2-4-7) Spreader The spreaders 47 and 47 are attached to the vicinity of the left end and the right end of the guide members 41 and 41, respectively. The spreaders 47, 47 are elastic stainless plate members. As shown in FIG. 23, the basic shape of the spreaders 47, 47 (the shape in a state where no external force is applied) is a shape that extends generally in the vertical direction and opens to the left and right in the downward direction. The lower ends of the spreaders 47, 47 reach the vicinity of the lower end surfaces of the leg tip portions 41a,... And the pedestals 46b, 46b in the vertical direction. The spreaders 47 and 47 push the tubular film Fc (particularly, the portion in contact with the vicinity of the lower end portion of the spreaders 47 and 47) conveyed in such a manner as to wrap around the spreaders 47 and 47 from the inside to the outside. As a result, the tubular film Fc (particularly, in the vicinity of the portions that become the upper seal portion SL1 and the lower seal portion SL2 of the bag B2) is formed into a flat shape.

(2-2-5) Horizontal Seal Mechanism As shown in FIG. 3, the horizontal seal mechanism 56 is disposed below and supports the forming mechanism 51, the pull-down belt mechanisms 52 and 52, the vertical seal mechanism 53, and the guide mechanism 54. It is supported by the frame 12. As shown in FIGS. 7 to 9, the horizontal seal mechanism 56 horizontally moves the main body portions 63a and 63b, the rotation mechanisms 65a and 65b having a function of rotating the main body portions 63a and 63b, and the main body portions 63a and 63b. A horizontal movement mechanism 60 having a function of causing the first seal jaws 61a and 61a and the second seal jaw 62a attached to the main body 63a, and the first seal jaws 61b and 61b and the second seal attached to the main body 63b. It has a jaw 62b. The tubular film Fc is conveyed downward in a state where the broken line C0 shown in FIG. 7 is the center in the width direction of the tubular film Fc.

(2-2-5-1) Main Body As shown in FIGS. 7 and 9, the main bodies 63a and 63b have a shape similar to an ellipse in a side view. Specifically, the main body portions 63a and 63b are respectively provided with first end portions ED1 and ED1 whose distance from the center is the first length L1, and second end portion ED2 whose distance from the center is the second length L2. And have. The second length L2 is shorter than the first length L1. The main body portions 63a and 63b are arranged on both sides with the tubular film Fc interposed therebetween. In FIG. 7, the main body portions 63a and 63b are arranged with a broken line C0 interposed therebetween.

  The body portions 63a and 63b support first seal jaws 61a, 61b,... And second seal jaws 62a and 62b, which will be described later (see FIGS. 7 and 9). Specifically, first seal jaws 61a, 61b,... Are supported by the first end portions ED1, ED1,..., Respectively, and second seal jaws 62a are respectively supported by the second end portions ED2, ED2. 62b are supported. The first seal jaws 61a, 61b,... And the second seal jaws 62a, 62b are all detachable from the main body portions 63a, 63b.

  The main body parts 63a and 63b can be rotated symmetrically with respect to the broken line C0 as a reference by driving rotation mechanisms 65a and 65b described later. Specifically, in FIGS. 7 and 9, the main body 63a rotates clockwise, and the main body 63b rotates counterclockwise. The main body parts 63a and 63b can be moved horizontally by a horizontal movement mechanism 60 described later. Specifically, the main body portions 63a and 63b can be moved toward and away from each other symmetrically with respect to the broken line C0 in FIG.

(2-2-5-2) Rotation Mechanism The rotation mechanisms 65a and 65b have center axes C1 and C2 provided at the centers of the main body portions 63a and 63b, respectively, and are driven by a drive motor (not shown). The central axes C1 and C2 extend in a direction perpendicular to the paper surface of FIG. When the central axes C1 and C2 are rotated by the drive motor, the main body portions 63a and 63b also rotate. The rotation mechanisms 65a and 65b rotate the main body parts 63a and 63b in directions opposite to each other.

(2-2-5-3) Horizontal Movement Mechanism The horizontal movement mechanism 60 is a mechanism that allows the main body portions 63a and 63b to move horizontally. Specifically, the horizontal movement mechanism 60 is a mechanism that causes the main body portions 63a and 63b to approach and separate from each other symmetrically in the longitudinal direction with respect to the broken line C0 in FIG. As shown in FIG. 8, the horizontal movement mechanism 60 includes horizontal movement plates 64a and 64b, a horizontal movement plate drive mechanism 55, and a drive motor (not shown).

(2-2-5-3-1) Horizontal moving plates The horizontal moving plates 64a and 64b are attached to both ends of the main body portions 63a and 63b in the left-right direction (perpendicular to the plane of FIG. 7 and FIG. 9). Specifically, they are attached to both ends of the central axes C1 and C2, respectively. The horizontal movement plates 64a and 64b are horizontally moved by a horizontal movement plate driving mechanism 55 described later.

(2-2-5-3-2) Horizontal movement plate drive mechanism The horizontal movement plate drive mechanism 55 includes a drive mechanism 75 for moving the horizontal movement plates 64a and 64b close to and away from each other, and the horizontal movement plates 64a and 64b. It has a guide part and a guide rail (not shown) that are slidably supported in the horizontal direction.

  The drive mechanism 75 includes a ball screw 17i, first and second nut members 17a and 17b, first and second connecting rods 17c and 17d, a pair of third connecting rods 17e, a fourth connecting rod 17f, It has joints 17g and 17h. The ball screw 17i is rotated by a servo motor 80 (see FIG. 7). The first and second nut members 17a and 17b are screwed into the ball screw 17i. The first and second connecting rods 17c and 17d are provided so as to be orthogonal to the ball screw 17i in a horizontal plane. The pair of third connecting rods 17e is provided along the moving direction of the horizontal moving plates 64a and 64b. The fourth connecting rod 17f is provided in parallel with the third connecting rod 17e. The first connecting rod 17c is connected to a pair of third connecting rods 17e via a joint 17g. The distal ends of the pair of third connecting rods 17e are fixed to the side end surfaces of the horizontal moving plate 64b. The pair of third connecting rods 17e penetrates the horizontal movement plate 64a in a slidable manner. The second connecting rod 17d is connected to the fourth connecting rod 17f via a joint 17h. The tip of the fourth connecting rod 17f is fixed to the side end surface of the horizontal moving plate 64a. The portion where the first nut member 17a is screwed with the ball screw 17i and the portion where the second nut member 17b is screwed with the ball screw 17i are reverse screws. The servo motor 80 causes the horizontal moving plates 64a and 64b to approach and separate from each other by rotating the ball screw 17i.

(2-2-5-4) First Seal Jaw The first seal jaws 61a, 61b,... Are used when continuously manufacturing the pillow type bag B1. The first seal jaws 61a, 61b,... Are members that extend longer than the dimension of the tubular film Fc in the left-right direction (that is, the direction perpendicular to the paper surface of FIGS. 7 and 9). Each of the first seal jaws 61a, 61b,... Has a heater inside, and the seal surface is heated by the heater. The pair of first sealing jaws 61a, 61b,... Sandwich a part of the tubular film Fc in the lateral direction with the heated sealing surface, and heat-seal the sandwiched part. Thereby, the upper seal portion SL1 and the lower seal portion SL2 are formed.

  As shown in FIGS. 10A and 10B, the first sealing jaws 61a, 61b,... Heat the tubular film Fc in the lateral direction while turning around the central axes C1, C2. Seal. Specifically, the first seal jaws 61a, 61b,... Each draw a D-shaped trajectory by a combination of horizontal reciprocation by the horizontal movement mechanism 60 and rotational movement by the rotation mechanisms 65a, 65b. The first seal jaws 61a, 61b,... Are paired with the first seal jaws 61a, 61b,... That form a pair while drawing a substantially straight I-shaped trajectory of the D-shaped trajectory. A cylindrical film Fc is sandwiched between and heat sealed.

(2-2-5-5) Second Seal Jaw The second seal jaws 62a and 62b are used when the flat bottom bag B2 is manufactured intermittently. The second seal jaws 62a and 62b are members that extend in the left-right direction (that is, the direction perpendicular to the paper surface of FIGS. 7 and 9) longer than the dimension of the tubular film Fc. Each of the second seal jaws 62a and 62b has a heater inside, and the seal surface is heated by the heater. The second sealing jaws 62a and 62b sandwich a part of the tubular film Fc with the heated sealing surface in the lateral direction, and heat-seal the sandwiched part. Thereby, the upper seal portion SL1 and the lower seal portion SL2 are formed.

  As shown in FIGS. 11A and 11B, the second seal jaws 62a and 62b reciprocate horizontally in the horizontal direction by the horizontal movement mechanism 60, thereby approaching and separating from the tubular film Fc. The second seal jaws 62a and 62b are heat-sealed by sandwiching the tubular film Fc at a position closest to each other.

(2-2-6) First folding mechanism The first folding mechanism 57 is used when manufacturing the flat bottom bag B2.

  The first bending mechanism 57 has a bottom plate 50 shown in FIGS. 3, 5, 6 and 18 and an air cylinder which is a kind of reciprocating actuator not shown. The bottom plate 50 is disposed above the lateral seal mechanism 56. The reciprocating actuator is controlled by a speed controller (not shown). The bottom plate 50 is reciprocated in the horizontal direction between the first retracted position (position in FIG. 5) and the first forward position (position in FIG. 6) by driving the reciprocating actuator. Proximity and separation. The bottom plate 50 in the first retracted position maintains a certain distance from the tubular film Fc, and the bottom plate 50 in the first forward position contacts the lower part of the tubular film Fc.

  The bottom plate 50 is a metal plate-like member having a resin applied on the surface, and has a shape like a fork having blades at the left and right ends, as shown in FIG. Specifically, the bottom plate 50 includes a base portion 50a, a left blade portion 50b corresponding to the leftmost blade, and a right blade portion 50c corresponding to the rightmost blade. The blade portions 50b and 50c extend forward from the base portion 50a toward the tubular film Fc.

  After the bottom seal portion SL2 is formed on the tubular film Fc, the bottom plate 50 moves to the first forward position below the tubular film Fc, and the bottom seal portion SL2 extends in the direction in which the lower seal portion SL2 extends (left-right direction). ) And push it down in the direction intersecting (front-back direction). Accordingly, the lower seal portion SL2 is bent with respect to the lower portion of the bag main body portion FL2, and a bag lower portion FA (see FIG. 15) is formed on the tubular film Fc. The bag lower portion FA has a lower seal portion SL2 of the bag B2 and lower portions of the first surface S1, the second surface S2, and the side surfaces S3 and S3. The bag lower portion FA is in a state before the bottom portion FB shown in FIG. 14B is formed.

(2-2-7) Second folding mechanism The second folding mechanisms 58, 58 are used when the flat bottom bag B2 is manufactured.

  The second bending mechanisms 58, 58 are disposed above the lateral seal mechanism 56, as shown in FIGS. The second bending mechanisms 58 and 58 include side plates 81 and 81, support members 82 and 82, rotation shafts 84 and 84, first drive units 83 and 83, and a second drive unit (not shown). (See FIG. 4). The side plates 81 and 81 are metal plate-like members having a resin applied on the surface, and each has a predetermined length in the depth direction (front-rear direction) of the tubular film Fc. The side plates 81 and 81 are formed with recesses 81b and 81b that are recessed from the contact surfaces 81a and 81a with the tubular film Fc, respectively (see FIG. 22).

  Hereinafter, although the operation of the right second bending mechanism 58 will be described, the left second bending mechanism 58 performs a symmetrical operation with the right second bending mechanism 58 with respect to the center line of the tube 11a. .

  The side plate 81 has a second retracted position (position shown in FIG. 20A) and a second advanced position (position extending in the horizontal direction shown in FIG. 20C) by the first driving section 83 and a second driving section (not shown). Reciprocates between. The side plate 81 moves to the second forward position in a state where the bottom plate 50 is at the first forward position, and pushes down the side part EP of the bag lower part FA in the direction (left-right direction) in which the lower seal part SL2 extends. Accordingly, the side portion EP of the bag lower FA is heat-sealed while being bent with respect to the vicinity CP1 of the bag lower FA. The side portions EP and EP of the bag lower FA are both sides of the bag lower FA in the direction (left-right direction) in which the lower seal portion SL2 extends. Note that the vicinity portions CP1 and CP1 of the bag lower FA to be described later are portions of the bag lower FA close to the side portions EP and EP, in other words, the central portion CP located between the side portions EP and EP. These are both sides in the left-right direction.

  The side plate 81 is connected to the support member 82 via the rotation shaft 84. The side plate 81 is rotated around the rotation shaft 84 by a second drive unit (not shown). The support member 82 is connected to the first drive unit 83. The first drive unit 83 is configured by an air cylinder or the like which is a kind of reciprocating actuator, and is controlled by a speed controller (not shown). The support member 82 reciprocates in an oblique direction by the drive of the first drive unit 83, and approaches and separates from the side part EP of the bag lower FA. As the support member 82 moves, the side plate 81 moves from the second retracted position (the position shown in FIG. 20A) to the second intermediate position (the position extending obliquely in FIG. 20C). It rotates around the rotation shaft 84 and moves from the second intermediate position to the second forward position (a position extending in the horizontal direction in FIG. 20C). Thereby, the side plate 81 contacts the side part EP of the bag lower part FA, and pushes down the side part EP so that the side part EP contacts the vicinity part CP1.

(2-3) Control Unit The control unit 7 includes a CPU, a ROM, a RAM, a flash memory, and the like, and controls the operation of each unit of the bag making and packaging machine 1 by reading and executing a program in the flash memory. As shown in FIG. 12, the control unit 7 includes a film supply unit 6, a pull-down belt mechanism 52, a vertical sealing mechanism 53, a guide mechanism 54, a horizontal sealing mechanism 56, a first folding mechanism 57, a second folding mechanism 58, and an origin adjustment. It is connected to the mechanism 59 and the operation panel 8.

(3) Operation of the bag making and packaging machine (3-1) Manufacturing operation of the pillow type bag The operation of the bag making and packaging machine 1 when manufacturing the pillow type bag B1 will be described.

  When the pull-down belt mechanisms 52 and 52 are driven, the sheet-like film F is fed out from the film roll of the film supply unit 6 and sent to the forming mechanism 51. In the forming mechanism 51, the sheet-like film F is wound around the outer surface of the tube 11a while passing through the gap between the former 11b and the tube 11a to form a tubular film Fc. The tubular film Fc is conveyed downward along the outer surface of the tube 11a by the pull-down belt mechanisms 52 and 52. When the sheet-like film F is wound around the tube 11a, both edges in the horizontal direction are superposed in the vertical direction. In the vertical sealing mechanism 53, the overlapping portion of the tubular film Fc is heat-sealed in the vertical direction. Thereafter, the tubular film Fc passes through the tube 11 a and descends to the lateral seal mechanism 56. At this time, the article C falls from the combination weighing machine 2 through the tube 11a into the cylindrical film Fc. Note that the control unit 7 instructs the control unit (not shown) of the combination weighing machine 2 to drop the article C at an appropriate timing.

  In the horizontal sealing mechanism 56, the first sealing jaws 61a, 61b,... Heat seal the cylindrical film Fc in the horizontal direction in a state where the article C is present in the cylindrical film Fc, and the top of the preceding bag B1. The seal portion SL1 and the lower seal portion SL2 of the subsequent bag B1 are formed simultaneously. At this time, the preceding bag B1 and the subsequent bag B1 (tubular film Fc) are separated by the cutter built in the first seal jaws 61a and 61b.

(3-2) Manufacturing Operation of Flat Bottom Bag The operation of the bag making and packaging machine 1 when manufacturing the flat bottom bag B2 will be described.

  When the pull-down belt mechanisms 52 and 52 are driven, the sheet-like film F is fed out from the film roll of the film supply unit 6 and sent to the forming mechanism 51. In the forming mechanism 51, the sheet-like film F is wound around the outer surface of the tube 11a while passing through the gap between the former 11b and the tube 11a to form a tubular film Fc. The tubular film Fc is conveyed downward along the outer surface of the tube 11a by the pull-down belt mechanisms 52 and 52. When the sheet-like film F is wound around the tube 11a, both edges in the horizontal direction are superposed in the vertical direction. In the vertical sealing mechanism 53, the overlapping portion of the tubular film Fc is heat-sealed in the vertical direction. Thereafter, the tubular film Fc passes through the tube 11 a and descends to the guide mechanism 54 and the lateral seal mechanism 56.

  When the tubular film Fc reaches the mechanisms 54 and 56, the tubular film Fc is first spread from the inside to the left and right by the spreaders 47 and 47. As a result, the shape of the tubular film Fc in the vicinity of the lower part of the spreaders 47, 47 becomes a flat shape that is pushed and spread in the left-right direction. When the tubular film Fc reaches both the mechanisms 54, 56, the guide members 41, 41 are in the open state shown in FIG. 6 (the leg tip portions 41a,... 5 in a closed state as shown in FIG. Therefore, the operations of the spreaders 47 and 47 that push the tubular film Fc in the left-right direction are not hindered by the operations of the guide members 41 and 41 that push the tubular film Fc in the front-rear direction.

  Subsequently, the second seal jaws 62a and 62b heat-seal while sandwiching the tubular film Fc having a shape pushed and spread in the lateral direction. The second seal jaws 62a and 62b simultaneously form the upper seal portion SL1 of the preceding bag B2 and the lower seal portion SL2 of the subsequent bag B2 by one sandwiching operation. Then, the preceding bag B2 and the succeeding bag B2 (tubular film Fc) are separated by a built-in cutter while heat-sealing the tubular film Fc.

  After the succeeding bag B2 and the preceding bag B2 are separated, the bottom FB of the succeeding bag B2 is formed. Specifically, first, the pressing mechanisms 45, 45 move in the directions of arrows D1, D1 (see FIG. 16) to press the pressing portions 43, 43. Then, as described above, the pressing force is transmitted to the guide members 41 and 41 via the transmission mechanisms 44 and 44. As a result, the guide members 41, 41 are in an open state, and the four leg tip portions 41a,... Are formed from the inner side in the front-rear direction (arrows) at the four corners of the bottom portion FB of the bag B2. D2 and D2 direction (see FIG. 17). Thereby, the depth dimension L of the bag B2 is determined, and the substantially rectangular shape of the bottom portion FB of the bag B2 is stably formed. When the guide members 41 and 41 are in an open state and the tubular film Fc is spread in the front-rear direction, the spreaders 47 and 47 are inward in the left-right direction by the tubular film Fc that is pushed and spread in the front-rear direction. Pressed and deformed flexibly. That is, the spreaders 47 and 47 play a role of spreading the tubular film Fc in the left-right direction, but do not hinder the operation of the guide members 41 and 41 that push the tubular film Fc in the front-rear direction.

  Subsequently, when the depth dimension L of the bag B2 is determined and a substantially rectangular shape of the bottom portion FB of the bag B2 is formed, the lower seal portion SL2 of the tubular film Fc is slightly lifted upward, The part which becomes the bottom part FB of the bag B2 is in contact with the lower end surface of the cradle 46b, 46b and the leg tip part 41a, ... of the guide members 41, 41. In this state, the drive rollers 21 and 21 of the pull-down belt mechanisms 52 and 52 rotate reversely by a predetermined amount. The forward direction is the direction of rotation when the cylindrical film Fc is conveyed downward. As a result, the tubular film Fc is pulled upward by several millimeters, but the receiving bases 46b and 46b and the guide members 41 and 41 serve as stoppers and are squeezed upward.

  Subsequently, in a state where the tubular film Fc is squeezed upward, the bottom plate 50 moves from the first retracted position (position of FIG. 5) to the first advanced position (position of FIG. 6) in the direction of arrow D3 (FIG. 18). Browse). As a result, the state shown in FIG. That is, the bottom plate 50 pushes down the lower seal portion SL2 in the direction (front-rear direction) intersecting with the direction (left-right direction) in which the lower seal portion SL2 extends, and bends the lower seal portion SL2 with respect to the lower portion of the bag body portion FL2. A lower bag FA is formed on the film Fc.

  Specifically, the left blade portion 50b and the right blade portion 50c of the bottom plate 50 contact the vicinity of the left and right ends of the lower seal portion SL2, respectively, and push down the vicinity of the left and right ends. As a result, the entire lower seal portion SL2 is bent with respect to the lower portion of the bag body portion FL2, and contacts the lower portion of the bag body portion FL2. Note that the vicinity of the left and right end portions of the lower seal portion SL2 is a portion of the lower seal portion SL2 in the vicinity of the end portion in the direction in which the lower seal portion SL2 extends (left and right direction) and is included in the central portion CP. In the present embodiment, since there is no other blade between the left blade portion 50b and the right blade portion 50c, the bottom plate 50 does not contact any portion of the lower seal portion SL2 other than the vicinity of the left and right end portions. . In other words, the bottom plate 50 does not contact the vicinity of the middle of the lower seal portion SL2 (near the middle of the direction in which the lower seal portion SL2 extends). That is, it is possible to minimize the contact area between the tubular film Fc and the bottom plate 50 while suppressing the entire lower seal portion SL2 with respect to the lower portion of the bag body portion FL2, and to suppress the frictional resistance therebetween. .

  On the other hand, the side plates 81 and 81 move to the second forward position (the position extending in the horizontal direction in FIG. 20C) with the bottom plate 50 in the first forward position in FIG. As a result, the state shown in FIG. That is, the side plates 81 and 81 heat-seal while pushing the side portions EP and EP of the bag lower portion FA in the direction (left and right direction) in which the lower seal portion SL2 extends and bending the side portions EP and EP with respect to the neighboring portions CP1 and CP1. By doing so, bottom FB of bag B2 is formed in cylindrical film Fc.

  Specifically, the support members 82 and 82 move obliquely downward toward the side portions EP and EP in the directions of arrows D4 and D4 (see FIG. 19), respectively. As a result, the side plates 81 and 81 also move from the second retracted position (position shown in FIG. 20A) to the second intermediate position (position extending obliquely in FIG. 20C). Subsequently, the side plates 81 and 81 rotate upward around the rotation shafts 84 and 84 in a state where the bottom plate 50 is at the first forward position in FIG. 2 Move to the forward position. As a result, the state shown in FIG. 22 is obtained, and the side plates 81 and 81 in the second forward position and the lower end surfaces of the receiving bases 46b and 46b are in contact with each other with the bottom portion FB of the bag B2 interposed therebetween. At this time, the left blade portion 50b and the right blade portion 50c of the bottom plate 50 enter the recesses 81b and 81b of the side plates 81 and 81, respectively. Therefore, although the bottom plate 50 exists between the side plates 81 and 81 and the lower end surfaces of the pedestals 46b and 46b, the film F between the side plates 81 and 81 and the lower end surfaces of the pedestals 46b and 46b is sandwiched. Does not interfere with contact. At this time, the side plates 81 and 81 push down the side portions EP and EP along the left and right edges of the bottom plate 50 at the first forward position in FIG. As a result, as shown in FIG. 21B, the left blade portion 50b and the right blade portion 50c of the bottom plate 50 are surrounded by the side portions EP and EP of the bottom portion FB of the bag B2 and the adjacent portions CP1 and CP1. . The side parts EP and EP and the neighboring parts CP1 and CP1 are in contact with each other only at a position on the inner side in the left-right direction with respect to the blade parts 50b and 50c. This is because the side portions EP and EP and the neighboring portions CP1 and CP1 cannot contact each other at the position where the blade portions 50b and 50c exist. The contact portions between the side portions EP and EP and the adjacent portions CP1 and CP1 are heat sealed by the residual heat of the heat sealing operation by the lateral seal mechanism 56. Accordingly, the blade portions 50b and 50c are in a state of penetrating in the front-rear direction through gaps formed between the side portions EP and EP and the neighboring portions CP1 and CP1, respectively.

  Article C with bottom plate 50 in the first forward position and side plates 81 and 81 in the second forward position, that is, with bottom plate 50 and side plates 81 and 81 pressing bottom FB from below. Lump falls from the combination weighing machine 2. Therefore, the lower seal portion SL2 of the bottom portion FB is not damaged by the impact of the drop of the article C. Note that the control unit 7 instructs the control unit (not shown) of the combination weighing machine 2 to drop the article C at an appropriate timing.

  Thereafter, the bottom plate 50 moves backward from the first forward movement position, and the side plates 81, 81 move backward to the second forward movement position with a delay. Subsequently, the tubular film Fc is further conveyed downward, the upper seal portion SL1 of the bag B2 is formed by the lateral seal mechanism 56, and is separated from the next bag B2.

(3-3) Operation at the time of stop and restart The manufacturing operation of the bags B1 and B2 is stopped when the operator operates the operation panel 8 to input a stop command or some abnormality occurs. The control unit 7 stops the operation of the bag making and packaging machine 1 after executing the following process (see FIG. 24) when manufacturing the flat bottom bag B2.

  First, in step S1, the control unit 7 determines whether or not the bottom portion FB is formed on the tubular film Fc. If it is determined that the bottom FB is formed on the tubular film Fc, the process proceeds to step S2, and if not, the process ends.

  In step S2, the control unit 7 determines whether or not the side plates 81, 81 are in the second forward position. If the side plates 81, 81 are in the second forward position, the process proceeds to step S3. If not, the process ends.

  In step S3, the control unit 7 moves the side plates 81, 81 to the second forward position, and waits in that state. Thereafter, this process ends.

  On the other hand, when step S3 is executed, information indicating that is stored in the control unit 7. Then, when the production of the bag B2 is resumed, the control unit 7 determines whether or not Step S3 has been executed when the bag B2 is stopped. When it is determined that step S3 is executed at the time of the stop, the timing when the article C falling from the combination weighing machine 2 reaches the bottom FB of the tubular film Fc at the time of manufacturing the first bag B2 after the restart. Until the side plates 81 and 81 are in the second advanced position. The manufacture of the second and subsequent bags B2 after the restart is as described above.

  With the above processing, when the manufacture of the bag B is resumed, either the bottom portion FB is not formed on the tubular film Fc, or the side plates 81 and 81 are in the second forward position. In other words, the bottom FB is not formed on the tubular film Fc, or the side plates 81 and 81 support the bottom FB of the bag B2 from below. Therefore, when the manufacture of the bag B2 is resumed, the lower seal portion SL2 of the bottom portion FB of the bag B2 formed before the stop is not damaged by the impact of the drop of the article C.

(3-4) Origin Adjustment Processing Hereinafter, origin adjustment processing of the second seal jaws 62a and 62b will be described.

  As described above, the second seal jaws 62a and 62b are attached to the main body parts 63a and 63. The main body parts 63a and 63 rotate around the central axes C1 and C2, and the central axes C1 and C2 Reciprocates horizontally in the horizontal direction. The origin adjustment process of the second seal jaws 62a and 62b is a process of adjusting the rotation origin of the central axes C1 and C2. The rotation origin is designed as a rotation position where the second seal jaws 62a and 62b are accurately meshed with each other. That is, when the rotation origin is accurately maintained as designed, the centers of both central axes C1 and C2 and the centers of both second seal jaws 62a and 62b are aligned in a straight line in the horizontal direction.

  The right side portion 9 of the casing of the bag making and packaging machine 1 can be opened and closed. The operator can access the origin adjustment mechanism 59 in the vicinity of the right side of the central axes C1 and C2 of the lateral seal mechanism 56 by opening the right side part 9.

  The origin adjustment mechanism 59 includes dogs 70 and 70 and sensors 71 and 71. The dogs 70 and 70 are fixed to the central axes C1 and C2, respectively. The dogs 70 and 70 rotate around the central axes C1 and C2. The sensors 71 and 71 are sensors that are disposed in the vicinity of the dogs 70 and 70, respectively, and detect that the dogs 70 and 70 exist within a predetermined detectable range. The detectable range of the sensors 71 and 71 is a part of the rotation locus of the dogs 70 and 70 rotating around the central axes C1 and C2, respectively.

  The origin adjustment process is started when the “origin adjustment” button displayed on the operation panel 8 is pressed. However, the “origin adjustment” button is enabled only while the sensors 71 and 71 detect the dogs 70 and 70 and disabled at other timings. That is, the origin adjustment process can be executed only while the sensors 71 and 71 detect the dogs 70 and 70. Therefore, the operator needs to manually rotate the central axes C1 and C2 and place the dogs 70 and 70 within the detectable range of the sensors 71 and 71 when performing the origin adjustment processing. As a result, the “origin adjustment” button is validated, and an origin adjustment process start command can be input.

  The origin adjustment process is executed in the following manner. First, the control unit 7 moves the central axes C1 and C2 in the horizontal direction to bring the second seal jaws 62a and 62b into contact with each other. At this time, if the rotation origins of the central axes C1 and C2 are deviated, the second seal jaws 62a and 62b do not mesh correctly, and a rotational moment acts on the second seal jaws 62a and 62b, and the central axis C1. , C2 rotates slightly. The rotation of the central axes C1 and C2 is detected as a shift of a position pulse of a servo motor (not shown). The control unit 7 converts the shift amount of the position pulse of the servo motor into the shift amount of the rotation origin, and rotates the central axes C1 and C2 so as to cancel the shift amount. Then, the second seal jaws 62a and 62b are brought into contact with each other again, and the displacement amount of the position pulse of the servo motor in that state is measured. If the displacement amount of the position pulse becomes substantially zero, it is determined that the rotation origin is accurately maintained, and the origin adjustment process is terminated. On the other hand, if the displacement amount of the position pulse does not become substantially zero, it is determined that the rotation origin has not been adjusted yet, the second seal jaws 62a and 62b are brought into contact again, and the position pulse in that state is determined. The operation of measuring the amount of deviation is executed. This operation is repeated until it is determined that the rotation origin is accurately maintained.

(4) Features of the bag making and packaging machine according to the present embodiment (4-1)
In the above embodiment, when the bottom portion FB of the flat bottom bag B2 is formed, the operation of the first folding mechanism 57 that bends the lower seal portion SL2 with respect to the lower portion of the bag body portion FL2, and the side portion EL of the bag body portion FL2. The second bending mechanism 58 for bending the EL with respect to the neighboring portions CP1 and CP1 is simultaneously performed. That is, both operations overlap. Accordingly, the productivity of the flat bottom bag B2 per unit time is improved.

(4-2)
In the said embodiment, the recessed parts 81b and 81b are formed in the surface 81a and 81a by the side which faces the film F of the side plates 81 and 81. As shown in FIG. Then, the blade portions 50b and 50c of the bottom plate 50 at the first forward position enter the recesses 81b and 81b of the side plates 81 and 81 at the second forward position. Accordingly, it is possible to reliably avoid interference between the bottom plate 50 in the first forward position and the side plates 81 and 81 in the second forward position.

(4-3)
In the above-described embodiment, the blade portions 50b and 50c of the bottom plate 50 are formed in the gaps formed between the side portions EP and EP of the bottom portion FB of the bag B2 facing each other and the adjacent portions CP1 and CP1 without heat sealing. Is enclosed. Therefore, the bottom plate 50 in the first forward position does not hinder the bending operation and the heat sealing operation by the side plates 81 and 81.

(4-4)
In the embodiment described above, the side plates 81 and 81 are bent while the side portions EP and EP of the bag lower portion FA are applied to the bottom plate 50 at the first advance position. As a result, the side parts EP and EP of the bag lower part FA can be neatly folded along the crease.

(4-5)
In the above embodiment, when the production of the bag B2 is resumed, the article C falls to the bottom FB while the side plates 81 and 81 reliably support the bottom FB of the bag B2 from below. Therefore, the lower seal portion SL2 of the bag B2 manufactured as the first bag when the manufacturing of the bag B2 is resumed is not damaged by the impact of the drop of the article C.

(4-6)
In the above-described embodiment, the portion that is heat-sealed in the lateral direction of the tubular film Fc is formed into a flat shape by the spreaders 47 and 47. Therefore, tack, pleats and the like are less likely to occur in the upper seal portion SL1 and the lower seal portion SL2 of the bag B2.

  When the cylindrical film Fc passes through the tube 11a and reaches the guide members 41, 41, the guide members 41, 41 are in a closed state. Furthermore, the outer periphery surrounding both guide members 41, 41 in a closed state is shorter than the outer periphery of the tube 11a. Therefore, if there is no spreader 47, 47, there is a possibility that wrinkles will occur in the tubular film Fc that encloses both the closed guide members 41, 41. However, in the above-described embodiment, the presence of the spreaders 47 and 47 makes it difficult for wrinkles to occur in the tubular film Fc transported in the vicinity of the guide mechanism 54.

(5) Modification (5-1)
In the embodiment described above, the side plates 81 and 81 have the recesses 81b and 81b. However, instead of forming the recesses 81b and 81b in the side plates 81 and 81, as shown in FIG. 26, the recesses 46c and 46c are formed in the pedestals 46b and 46b, and the blade of the bottom plate 50 in the first forward position is formed. The portions 50b and 50c may enter the recesses 46c and 46c. The recesses 46c and 46c are depressions formed on the contact surfaces of the pedestals 46b and 46b with the side plates 81 and 81 (lower end surfaces of the pedestals 46b and 46b), respectively. Further, the side plates 81 and 81 may be formed with the recesses 81b and 81b, and the receiving bases 46b and 46b may be formed with the recesses 46c and 46c.

  Further, the shape of the bottom plate 50 is not limited to that described above. For example, the positions of the blade portions 50b and 50c may be moved more inward, and another blade portion 50d may be provided between the blade portions 50b and 50c as shown in FIG. In that case, the shapes of the side plates 81 and 81 and the pedestals 46b and 46b (the positions and shapes of the recesses) are appropriately changed in accordance with the shape of the bottom plate 50.

(5-2)
In the above embodiment, when the manufacture of the bag B2 is stopped, the side plates 81, 81 are moved to the second forward position as necessary. However, instead of moving the side plates 81, 81 to the second forward position, the bottom plate 50 may be moved to the first forward position, or both may be moved. In that case, at the time of manufacturing the first bag B2 after resuming the manufacturing of the bag B2, the bottom plate 50 is kept in the first forward position until the article C reaches the bottom FB of the tubular film Fc.

  On the other hand, from the viewpoint of protecting the lower seal portion SL2 of the bottom portion FB of the bag B2 formed before the stop, the following can also be performed. That is, instead of executing the processing of the flowchart of FIG. In such a case, instead of moving the side plates 81, 81 to the second forward position, the bottom plate 50 may be moved to the first forward position, or both may be moved.

(5-3)
In the above-described embodiment, the side plates 81 and 81 are retracted from the second advance position after the bottom plate 50 is retracted from the first advance position. However, for example, the bottom plate 50 and the side plates 81, 81 may be simultaneously retracted from the first forward position and the second forward position, respectively, and after the side plates 81, 81 are retracted from the second forward position, The plate 50 may be retracted from the first advanced position.

DESCRIPTION OF SYMBOLS 1 Bag making packaging machine 46 L-shaped member 46b Base 50 Bottom plate 51 Molding mechanism 52 Pull-down belt mechanism 53 Vertical seal mechanism 54 Guide mechanism 56 Horizontal seal mechanism 57 First folding mechanism 58 Second folding mechanism 59 Origin adjustment mechanism 81 Side Plate B2 Flat bottom type bag SL2 Lower seal part FA Bag lower part FB Bottom part EP Side part CP1 Near part

JP 2000-335511 A

Claims (9)

A bag making and packaging machine for manufacturing a bag having a main body portion that encloses an object to be packaged, and upper and lower upper and lower seal portions of the main body portion,
A horizontal sealing mechanism that thermally seals the tubular packaging material in the lateral direction and forms the upper seal portion and the lower seal portion;
The lower seal part is bent with respect to a part of the main body part by moving the lower seal part to a first position where the lower seal part is pushed down in a direction intersecting the extending direction of the lower seal part, and the lower seal part and the main body part A first bending member that forms a bag lower portion of the bag including a part of the bag;
In a state where the first bending member is in the first position, the side part of the lower part of the bag in the direction in which the lower seal part extends is moved to a second position where the side part is pushed down in the direction in which the lower seal part extends. A second bent member that heat-seals while bending a side portion of the bag lower portion adjacent to the side portion;
Comprising
Bag making and packaging machine. The first bending member is in contact with the vicinity of the end of the lower seal portion in the direction in which the lower seal portion extends, and by pushing down the vicinity of the end portion, the entire lower seal portion is made part of the main body portion. Bend,
The bag making and packaging machine according to claim 1. The first bending member does not contact a portion of the lower seal portion other than the vicinity of the end portion;
The bag making and packaging machine according to claim 2. In the first position, the first bending member is surrounded by the side portion and the vicinity portion where the second bending member in the second position is bent.
The bag making and packaging machine according to any one of claims 1 to 3. The second bending member bends the side portion with respect to the neighboring portion by pushing down the side portion along the first bending member in the first position.
The bag making and packaging machine according to any one of claims 1 to 4. The second bending member is formed with a recess recessed from the contact surface with the packaging material,
The first bending member enters the recess in the first position;
The bag making and packaging machine according to any one of claims 1 to 5. A cradle that is arranged inside the cylindrical packaging material and that contacts the second bending member in the second position across the side portion and the vicinity portion;
Further comprising
The cradle is formed with a recess recessed from the contact surface with the second bending member,
The first bending member enters the recess in the first position;
The bag making and packaging machine according to any one of claims 1 to 5. When the production of the bag is stopped, the second folding member stops at the second position, the production of the bag is resumed, and the packaged material falling from above reaches the lower part of the bag. Wait in the second position,
The bag making and packaging machine according to any one of claims 1 to 7. When the manufacture of the bag is stopped, the first folding member stops at the first position, the manufacture of the bag is resumed, and the packaged material falling from above reaches the lower part of the bag Wait in the first position,
The bag making and packaging machine according to any one of claims 1 to 8.

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