JP7176709B2 - bag making and packaging machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bag-making and packaging machine that manufactures a bag from a tubular packaging material and uses the bag to package an article.

2. Description of the Related Art Conventionally, a vertical pillow bag making and packaging machine has been used as a bag making and packaging machine that forms a bag from a packaging material and fills the bag with an article such as food for airtight packaging. This form-fill-seal machine forms a sheet-like film packaging material into a tubular shape, and seals the overlapped longitudinal edges of the tubular packaging material with a vertical sealing mechanism. Next, the bag-making and packaging machine seals the packaging material in the horizontal direction by the horizontal sealing mechanism, and then fills the inside of the packaging material with the article. The horizontal sealing mechanism sandwiches the packaging material between a pair of sealing jaws to seal the packaging material in the horizontal direction. Next, the form-fill-seal machine laterally seals the packaging material above the articles filled in the packaging material by means of the lateral sealing mechanism. Next, the bag making and packaging machine cuts the portion laterally sealed by the lateral sealing mechanism with a cutter in the lateral direction to separate the bag filled with the articles from the packaging material. The bag making and packaging machine repeats and continuously performs the above operations.

In such a form-fill-seal machine, when the packaging material is sealed by the horizontal sealing mechanism, the packaging material and the article may be pinched and caught between the pair of sealing jaws. Therefore, in order to suppress the occurrence of sealing defects due to the articles being caught, a squeezing plate disposed below the sealing jaws has been conventionally provided as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-174289). used. The squeezing plates are a pair of plates that sandwich the packaging material from both sides. The squeezing plates pinch the packaging material before it is sealed by the horizontal sealing mechanism and squeeze it downwards, thereby brushing off the articles adhering to the inside of the packaging material and suppressing the occurrence of sealing defects due to the articles getting caught. do.

However, if the article is a package with a predetermined content, such as individually wrapped hard candy, the package may be caught in the pair of sealing jaws even if the squeezing plate is used. This is because a gap of about 1 mm is normally formed between a pair of squeezing plates, so even if the packaging material is caught in the gap, there is a risk that the squeezing plate will not shake off the packaging material. It is from.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bag-making and packaging machine capable of suppressing the occurrence of sealing defects due to articles being caught.

A bag-making and packaging machine according to the present invention manufactures a bag from a tubular packaging material and uses the bag to package an article. This form-fill-seal machine includes a conveying section, a sealing section, and a squeezing section. The transport unit transports the packaging material downward. The sealing section seals the packaging material in a lateral direction orthogonal to the direction in which the packaging material is conveyed by the conveying section. The squeezing part squeezes the packaging material by descending faster than the packaging material conveyed downward by the conveying part while contacting the packaging material before the sealing part seals the packaging material. The squeezing part has a first contact member and a second contact member that come into contact with the packaging material when squeezing the packaging material. The first contact member and the second contact member are different from each other in at least one of material and rigidity.

The form-fill-seal machine according to the present invention includes a squeezing section for suppressing the articles from being caught when the sealing section seals the packaging material. The squeezing section has a first contact member and a second contact member for squeezing downward the articles adhering to the inside of the packaging material. The first contact member and the second contact member are different from each other in at least one of material and rigidity. Therefore, even if the article is not squeezed by one of the first contact member and the second contact member, the article is squeezed by the other. Therefore, the bag making and packaging machine according to the present invention can suppress the occurrence of sealing defects due to the articles getting caught.

Further, in the form-fill-seal machine according to the present invention, the first contact member and the second contact member are a pair of members that sandwich the packaging material in the sandwiching direction, and the second contact member It is preferably arranged upstream or downstream of the contact member. The pinching direction is the direction perpendicular to both the transport direction and the transverse direction.

In this case, the first contact member and the second contact member are arranged along the conveying direction of the packaging material. Therefore, if the article is squeezed off by one of the first contact member and the second contact member, the article will not be caught by the other.

Moreover, in the bag making and packaging machine according to the present invention, it is preferable that the second contact member has a lower elastic modulus in the sandwiching direction than the first contact member.

In this case, even if the first contact member does not pinch the article and does not squeeze the article, the second contact member can pinch the article and squeeze the article by elastic deformation.

Further, in the bag making and packaging machine according to the present invention, it is preferable that the gap in the sandwiching direction between the second contact members is smaller than the gap in the sandwiching direction between the first contact members.

In this case, even if the article is not pinched by the first contact members and the article is not squeezed, the second contact member can pinch and squeeze the article.

Moreover, in the bag making and packaging machine according to the present invention, it is preferable that the second contact member can be elastically deformed according to the shape of the article when the article is sandwiched between the second contact members.

In this case, even if the first contact member does not pinch the article and does not squeeze the article, the second contact member can pinch the article and squeeze the article by elastic deformation.

Moreover, in the bag making and packaging machine according to the present invention, it is preferable that the second contact member is a sponge or a helical spring arranged so as to extend in the lateral direction.

In this case, even if the first contact member does not pinch the article and does not squeeze the article, the second contact member can pinch the article and squeeze the article by elastic deformation.

Moreover, in the bag making and packaging machine according to the present invention, it is preferable that the second contact member is arranged downstream of the first contact member in the conveying direction.

In this case, even if the article is not pinched by the first contact members and the article is not squeezed, the second contact member can pinch and squeeze the article.

Moreover, in the bag making and packaging machine according to the present invention, the article is preferably a package in which the contents are packaged.

In this case, even if one of the first contact member and the second contact member does not scrape off the packaging material of the package in which the contents are packaged, the other of the first contact member and the second contact member scrapes off the packaging material of the package.

Further, in the bag making and packaging machine according to the present invention, the distance between the sealing portion and the squeezing portion in the conveying direction is at least the maximum size of the package and the size of the contents packaged in the package. It is preferably the difference from the minimum value.

In this case, since a sufficient distance is secured between the sealing portion and the ironing portion, the sealing portion prevents the packaging material of the package from being pinched regardless of the positions and orientations of the contents and the package. be.

The form-fill-seal machine according to the present invention can suppress the occurrence of sealing defects due to the articles getting caught.

1 is a perspective view of a bag making and packaging machine 1 that is an embodiment of the present invention; FIG. FIG. 3 is a perspective view showing a schematic configuration of a bag-making and packaging unit 93; 4 is a side view of the horizontal sealing mechanism 5 as seen from the right side; FIG. FIG. 4 is a view taken along line AA in FIG. 3; FIG. 4 is a partially cutaway view along line E--I of FIG. 3; 3 is a plan view of the horizontal sealing mechanism 5 with sealing jaws 11a and 11b in contact (closed); FIG. 4 is a right side view of the horizontal sealing mechanism 5 with sealing jaws 11a and 11b lowered to the bottom dead center; FIG. 4 is a schematic enlarged longitudinal sectional view showing an engaging portion between the spline shaft 20 and the support unit 13; FIG. It is the figure which looked at the horizontal sealing mechanism 5 from the right side. FIG. 10 is a schematic view similar to FIG. 9, showing a tubular film F sandwiched between a pair of sealing jaws 11a and 11b and a pair of squeezing members 51 and 52. FIG. In FIG. 10, it is the schematic of the 1st board member 51a and the 2nd board member 52a seen from the upper side toward the lower side. 11 is an enlarged view of the vicinity of squeezing members 51 and 52 of FIG. 10. FIG. FIG. 13 is a side view similar to FIG. 12 and is an enlarged view of the vicinity of squeezing members 51 and 52 of modification A. FIG. FIG. 13 is a side view similar to FIG. 12 and is an enlarged view of the vicinity of squeezing members 51 and 52 of modification B. FIG. 5 is a top view of a first elastic member 51b and a second elastic member 52b; FIG. FIG. 10 is a diagram for explaining the surplus margin of the article P in the modified example D; FIG. 11 is a diagram for explaining squeezing members 251 and 252 in Modification E. FIG. FIG. 11 is a diagram for explaining squeezing members 351a, 351b, 352a, and 352b in modification F;

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

(1) Configuration of bag-making and packaging machine FIG. 1 is a perspective view of a bag-making and packaging machine 1 that is an embodiment of the present invention. The bag-making and packaging machine 1 is a machine for packing articles such as foods into bags. The bag-making and packaging machine 1 mainly comprises a combination weighing unit 92 , a bag-making and packaging unit 93 and a film supply unit 94 .

The combination weighing unit 92 is arranged above the bag making and packaging unit 93 . The combination weighing unit 92 weighs the articles with a plurality of weighing hoppers, and combines the weight values weighed at each weighing hopper to obtain a predetermined total weight. The combination weighing unit 92 discharges the combined predetermined total weight of articles downward and supplies them to the bag making and packaging unit 93 .

The bag-making and packaging unit 93 puts the articles into the bag and seals the bag at the timing when the articles are supplied from the combination weighing unit 92 . The detailed configuration and operation of the bag making and packaging unit 93 will be described later.

The film supply unit 94 is installed adjacent to the bag making and packaging unit 93 and supplies the bag making and packaging unit 93 with a packaging film to be formed into a bag. A film roll wound with film is set in the film supply unit 94 . Film is unwound from a film roll to a film supply unit 94 .

The bag making and packaging machine 1 includes an operation switch 95 and a liquid crystal display 96 . An operation switch 95 and a liquid crystal display 96 are attached to the front surface of the bag making and packaging machine 1 main body. The liquid crystal display 96 is a touch panel type display arranged at a position where the operator of the operation switch 95 can visually recognize. The operation switch 95 and the liquid crystal display 96 function as input devices for receiving instructions to the bag making and packaging machine 1 and settings related to the bag making and packaging machine 1 . The liquid crystal display 96 functions as an output device that displays information about the bag making and packaging machine 1 .

The bag making and packaging machine 1 includes a control section (not shown). The control unit is a computer including a CPU, ROM, RAM, and the like. The controller is connected to a combination weighing unit 92, a bag making and packaging unit 93, a film supply unit 94, an operation switch 95 and a liquid crystal display 96. The controller controls the combination weighing unit 92 , the bag making and packaging unit 93 and the film supply unit 94 based on inputs from the operation switch 95 and the liquid crystal display 96 , and outputs various information to the liquid crystal display 96 .

(2) Configuration of Bag-Making and Packaging Unit FIG. 2 is a perspective view showing a schematic configuration of the bag-making and packaging unit 93. As shown in FIG. In the following description six directions are defined as shown in FIG. Note that directions corresponding to the directions shown in FIG. 2 are also shown in other drawings.

The bag-making and packaging unit 93 is mainly composed of a forming mechanism 73 , a pull-down belt mechanism 74 , a vertical sealing mechanism 4 and a horizontal sealing mechanism 5 . The forming mechanism 73 forms the sheet-like film Fa conveyed from the film supply unit 94 into a tubular shape. The pull-down belt mechanism 74 conveys the tubular film Fa downward. The vertical sealing mechanism 4 forms a tubular film F by sealing the overlapping portions of both ends of the tubular film Fa in the vertical direction parallel to the transport direction. The lateral sealing mechanism 5 seals the tubular film F in the lateral direction orthogonal to the transport direction to form a bag X with the top and bottom ends laterally sealed.

(2-1) Forming Mechanism The forming mechanism 73 has a tube 2 and a former 2a. The tube 2 is a cylindrical member with open upper and lower ends. Articles P supplied from the combination weighing unit 92 are put into the opening at the upper end of the tube 2 . The former 2 a is arranged so as to surround the tube 2 . The film Fa unwound from the film roll of the film supply unit 94 is wound around the tube 2 and formed into a cylindrical shape when passing through the gap between the tube 2 and the former 2a. The tube 2 and the former 2a can be replaced according to the size of the bag X to be manufactured.

(2-2) Pull-down Belt Mechanism The pull-down belt mechanism 74 conveys the film Fa wound around the tube 2 downward while sucking it. The pulldown belt mechanism 74 mainly has pulleys 3a, 3a and a pair of pulldown belts 3,3. As shown in FIG. 2, the pair of pull-down belts 3, 3 are arranged on the left and right sides of the tube 2 so as to sandwich the tube 2, and have a mechanism for sucking the tubular film Fa. The pull-down belt mechanism 74 conveys the tubular film Fa downward by rotating the pair of pull-down belts 3, 3 by the pulleys 3a, 3a.

(2-3) Vertical Sealing Mechanism The vertical sealing mechanism 4 seals the tubular film Fa in the vertical direction (vertical direction in FIG. 2). The vertical sealing mechanism 4 is arranged on the front side of the tube 2 . The vertical sealing mechanism 4 is moved back and forth toward or away from the tube 2 by a driving mechanism (not shown).

By moving the vertical sealing mechanism 4 closer to the tube 2 , the vertically overlapped portion of the film Fa wrapped around the tube 2 is sandwiched between the vertical sealing mechanism 4 and the tube 2 . The vertical sealing mechanism 4 heats the overlapped portion of the film Fa while pressing it against the tube 2 with a constant pressure, and seals the overlapped portion of the film Fa in the vertical direction to form a tubular film F. The vertical sealing mechanism 4 has a heater that heats the overlapped portion of the film Fa, a heater belt that contacts the overlapped portion of the film Fa, and the like.

(2-4) Horizontal Sealing Mechanism (2-4-1) Overall Configuration FIG. 3 is a side view of the horizontal sealing mechanism 5 viewed from the right side. The cylindrical film F is pulled down by driving a pair of pull-down belts 3, 3 (only the right pull-down belt is shown in FIG. 3) arranged on both left and right sides of the tube 2, and the front side of the tube 2 is pulled down. The overlapped side edges are vertically sealed by a vertical sealing mechanism 4 arranged in the tube 2, and laterally sealed at two locations by a horizontal sealing mechanism 5 arranged below the tube 2 to form a bag X. The bag X is filled with articles P introduced from above the tube 2 between two horizontal seals. The bag X is cut off one by one by a cutter (not shown) incorporated in the horizontal sealing mechanism 5 and transported downstream of the production line.

In the bag making and packaging machine 1, the pull-down belts 3, 3, the pulleys 3a, 3a around which the pull-down belts 3, 3 are wound, and the film conveying servo motor ( (not shown) constitutes transport means for transporting the vertically extending cylindrical film F in the vertical direction (vertical direction) (see FIG. 5).

As shown in FIG. 4, the horizontal sealing mechanism 5 includes a pair of front and rear sealing jaws 11a and 11b. The sealing jaws 11a and 11b extend horizontally in the left-right direction and are attached to bases 12a and 12b, respectively. The bases 12a and 12b are supported horizontally and movably in the front-rear direction by the support unit 13. As shown in FIG. A cutter is housed in the rear jaw base 12b.

The support unit 13 has a pair of left and right support blocks 15 , 15 connected by a connection frame 14 . A support rod 16 extending in the front-rear direction slidably penetrates each block 15 . A front jaw base 12 a is stretched over the front ends of the support rods 16 , 16 , and a connecting base 17 is stretched over the rear ends of the support rods 16 , 16 . Each support rod 16 is supported by an arm portion 18 extending forward from the block 15 to maintain a horizontal posture. The rear jaw base 12b is slidably fitted to the support rods 16, 16 between the arms 18, 18 and the blocks 15, 15. As shown in FIG.

The sealing jaws 11a and 11b are reciprocated in the front-rear direction by a crank mechanism. Specifically, as shown in FIG. 5 , the upper end of the spline shaft 20 protrudes upward from the upper surface of the connection frame 14 , and the crank 21 is fitted to the protruding end of the spline shaft 20 . As shown in FIG. 4, a link 22a for the front seal jaw 11a is provided between one rotating end of the crank 21 and the connecting base 17, and the other rotating end of the crank 21 and the rear seal jaw 11a. A link 22b for the rear sealing jaw 11b is provided between the side jaw base 12b.

As shown in FIG. 4, when the spline shaft 20 rotates in the direction of arrow a from the state in which the seal jaws 11a and 11b are separated from each other, the crank 21 also rotates integrally in the same direction. This rotary motion is converted into longitudinal linear motion by the links 22a and 22b. Thereafter, the front jaw link 22a pushes the connection base 17 rearward, thereby moving the entire frame structure composed of the connection base 17, the pair of left and right support rods 16, and the front jaw base 12a rearward. to horizontally move the front sealing jaw 11a rearward. On the other hand, the rear jaw link 22b pushes the rear jaw base 12b forward, thereby horizontally moving the rear sealing jaw 11b forward.

The distance from the center of rotation of the crank 21 to the connection point of each link 22a, 22b is the same, and the shape of the links 22a, 22b is also the same. Therefore, by rotating the single spline shaft 20, the pair of front and rear sealing jaws 11a and 11b are simultaneously moved in opposite directions by the same distance. As a result, as indicated by solid lines in FIG. 6, the sealing jaws 11a and 11b come into contact (close) with the tubular film F sandwiched therebetween. Then, the cylindrical film F is laterally sealed in the lateral direction (horizontal direction) by heat and pressure during this contact.

From this state, when the spline shaft 20 rotates in the direction of the arrow b, the front seal jaw 11a horizontally moves forward, and the rear seal jaw 11b simultaneously moves backward by the same distance. Move horizontally. As a result, as shown in FIG. 4, the sealing jaws 11a and 11b are separated (opened) from each other.

In the bag making and packaging machine 1, the crank 21 and the links 22a and 22b constitute a horizontal movement mechanism for horizontally moving (opening and closing) the sealing jaws 11a and 11b. The support unit 13 supports the horizontal movement mechanism and the sealing jaws 11a, 11b.

As shown in FIG. 5, the spline shaft 20 is upright and vertically penetrates the connection frame 14 of the support unit 13 . A pair of upper and lower horizontal beams 42a and 42b are provided on the front side of the main body 1a of the bag making and packaging machine 1, and a bearing 27 is provided on the inner surface of the lower beam 42b so that the lower portion of the spline shaft 20 can rotate freely. Supported.

As shown in FIG. 3, a timing pulley 26 is attached to the lower end of the spline shaft 20, and the timing pulley 26 and a timing pulley 24 attached to the output shaft of a servomotor 23 for horizontal movement (for opening and closing jaws). A timing belt 25 is wound between them. That is, the spline shaft 20 is rotated in directions a and b by driving the servomotor 23, and the sealing jaws 11a and 11b are opened and closed. The servomotor 23 is attached to the packaging machine main body 1a by means of a bracket (not shown) or the like.

In the bag making and packaging machine 1, the horizontal movement mechanism and the servomotor 23 constitute lateral movement means for moving the pair of sealing jaws 11a and 11b in the horizontal direction to contact and separate them.

As shown in FIG. 5, the upper and lower horizontal beams 42a, 42b are provided with a pair of left and right guide rods 45, 45 through mounting blocks 43, 43, 44, 44, respectively. Each guide rod 45 stands upright in parallel with the spline shaft 20 and vertically penetrates the support block 15 of the support unit 13 . Thereby, the support unit 13 is supported at three points by the two guide rods 45 and 45 and one spline shaft 20 . Further, as shown in FIG. 4, the guide rods 45, 45 and the spline shaft 20 are positioned at the vertices of the triangle in plan view, so the support unit 13 is stably supported by the surface.

Support unit 13 reciprocates up and down along rods 45, 45 and shaft 20 by a crank-link mechanism. Specifically, as shown in FIG. 5, a pair of left and right vertical walls 36, 36 are erected from the packaging machine main body 1a. As shown in FIG. 4, a crankshaft 35 is rotatably spanned between the vertical walls 36,36. Crank arms 37 , 37 are attached to both ends of the crankshaft 35 . As shown in FIG. 3, one end of an intermediate link 40 is connected to the rotating end of each crank arm 37 . The other end of the intermediate link 40 is connected to the middle of the swing link 39 in the longitudinal direction.

As shown in FIG. 5, a swing fulcrum shaft 38 is also rotatably stretched between the vertical walls 36,36. One ends of swing links 39 , 39 are attached to both ends of the swing fulcrum shaft 38 . As shown in FIG. 3 , the swing end of each swing link 39 is connected to the support block 15 of the support unit 13 via a second intermediate link 41 .

A servomotor 31 for vertical movement (for raising and lowering the jaws) is installed in the main body 1a of the packaging machine. A timing belt 33 is wound around. That is, the drive of the servomotor 31 rotates the crankshaft 35 in the direction c, and the support unit 13 moves up and down. At that time, the rotation of the crank arm 37 causes the intermediate link 40 to move up and down, causing the swing link 39 to swing up and down. The swing link 39 vertically reciprocates the entire support unit 13, the seal jaws 11a and 11b, the horizontal movement mechanism, and the like, while the second intermediate link 41 absorbs twisting between the arc motion and the linear motion.

3 shows the state where the support unit 13 is at the top dead center, and FIG. 7 shows the state where it is at the bottom dead center. Although not shown in detail, at the top dead center, the sealing jaws 11a and 11b are slightly closed because the lateral sealing starts immediately. Also, at the bottom dead center, the sealing jaws 11a and 11b have already finished lateral sealing, so they are slightly open.

In the bag making and packaging machine 1, the crank arm 37, the plurality of links 39 to 41, and the like constitute a vertical movement mechanism for moving (elevating) the support unit 13 up and down. The vertical movement mechanism and the servomotor 31 constitute vertical movement means for moving the pair of sealing jaws 11a and 11b in the vertical direction along the conveying direction of the tubular film F. As shown in FIG.

A well-known ball spline is used for the engagement portion between the spline shaft 20 and the connection frame 14 of the support unit 13 (indicated by symbol A in FIG. 5). That is, as shown in some detail in FIG. 8 , the crank 21 is directly connected to the ball spline 81 to transmit the rotation of the spline shaft 20 . A cross roller bearing 82 and an outer housing 83 are present between the spline shaft 20 and the connecting frame 14 so that the spline shaft 20 and the connecting frame 14 are not in direct contact. In other words, the rotation of the spline shaft 20 is not transmitted to the connection frame 14 . However, the spline shaft 20 is slidable only in the vertical direction. As a result, the spline shaft 20 can transmit the driving force to the horizontal movement mechanism and guide the vertical movement of the support unit 13 without hindrance.

In the bag making and packaging machine 1, the sealing jaws 11a and 11b are horizontally moved so as to come into contact with or separate from each other (open and close) by the horizontal movement means, and are vertically moved together with the support unit 13 by the vertical movement means. As a result, the sealing jaws 11a and 11b can perform a box motion including a quadrilateral or oval shape when viewed from the side, as indicated by symbols S and S in FIG.

The bag making and packaging machine 1 is provided with a pair of guide rods 45, 45 for guiding the vertical movement of the support unit 13, and a spline shaft 20 originally provided for driving the horizontal movement mechanism. It also functions as a guide rod by vertically penetrating the support unit 13 in parallel with the pair of guide rods 45 , 45 . Therefore, it is possible to support the support unit 13 at three points and on the surface while achieving common use of members, reduction in the number of parts, and simplification of the structure without installing extra members. Stabilization of the posture of the sealing jaws 11a and 11b is facilitated, and high-speed vertical operation of the support unit 13 and the sealing jaws 11a and 11b is ensured.

(2-4-2) Configuration of Sealing Jaw Next, the detailed configuration of the sealing jaws 11a and 11b of the present embodiment will be described. Hereinafter, the pair of sealing jaws 11a and 11b will be referred to as a first sealing jaw 11a and a second sealing jaw 11b, respectively, as required. FIG. 9 is a schematic view of the lateral sealing mechanism 5 having the first sealing jaw 11a and the second sealing jaw 11b as seen from the right side. FIG. 9 shows the tubular film F before it is sandwiched between the sealing jaws 11a and 11b and laterally sealed. In FIG. 9, the lower end of the tubular film F is already laterally sealed, and the interior of the tubular film F below the lateral sealing mechanism 5 is filled with the articles P discharged from the combination weighing unit 92. .

Note that, in the present embodiment, the article P is a package in which the content C is wrapped in a packaging material M, as shown in FIG. 9 . For example, the article P is an individually wrapped hard candy. In this case, the content C is one hard candy, and the article P, which is the package, is one hard candy wrapped in the packaging material M. That is, the inside of the bag X manufactured by the bag-making and packaging unit 93 is filled with a plurality of articles P, and the content C is sealed inside each article P, which is a package.

Sealing jaws 11a and 11b are attached to jaw bases 12a and 12b, respectively. A first squeezing member 51 is further attached to the front jaw base 12a to which the first sealing jaw 11a is attached. A second squeezing member 52 is further attached to the rear jaw base 12b to which the second sealing jaw 11b is attached. Hereinafter, the first squeezing member 51 and the second squeezing member 52 are collectively referred to as squeezing members 51 and 52 as necessary.

The first squeezing member 51 is attached to the front jaw base 12a via a first pressing member 51c. The second squeezing member 52 is attached to the rear jaw base 12b via a second pressing member 52c. The first pressing member 51c is fixed to the jaw base 12a on the front side and attached to the first squeezing member 51 on the rear side. The second pressing member 52c is fixed to the jaw base 12b on the rear side and attached to the second squeezing member 52 on the front side.

The squeezing members 51 and 52 are arranged so as to extend along the direction perpendicular to the paper surface of FIG. 9 (left and right direction in FIG. 2). The first squeezing member 51 and the second squeezing member 52 are arranged below the first sealing jaw 11a and the second sealing jaw 11b, respectively. The squeezing members 51 and 52 move in conjunction with the sealing jaws 11a and 11b, respectively. Therefore, the first squeezing member 51 and the second squeezing member 52 move toward and away from each other along the front-rear direction.

FIG. 10 is a schematic view similar to FIG. 9, showing the tubular film F sandwiched between the pair of sealing jaws 11a and 11b and the pair of squeezing members 51 and 52. As shown in FIG. From the state shown in FIG. 10, the pair of sealing jaws 11a and 11b move downward (downward) while leaving a gap of 1 mm to 5 mm from each other. At this time, the squeezing members 51 and 52, which move in conjunction with the sealing jaws 11a and 11b, move downward (lower side) while leaving an interval of about 1 mm from each other, and are laterally sealed by the sealing jaws 11a and 11b. The tubular film F before being pulled is squeezed. As a result, the squeezing members 51 and 52 push down and shake off the article P adhering to the inside of the tubular film F, whereby the article P is bitten by the pair of sealing jaws 11a and 11b sandwiching the article P. prevent intrusion. The entanglement of the article P causes a sealing failure when the tubular film F is laterally sealed. The pair of sealing jaws 11a and 11b apply heat and pressure to the tubular film F that has been squeezed by the squeezing members 51 and 52 to laterally seal the tubular film F. As shown in FIG.

Next, a detailed configuration of the squeezing members 51 and 52 will be described. The first squeezing member 51 is composed of a first plate member 51a and a first elastic member 51b. The second squeezing member 52 is composed of a second plate member 52a and a second elastic member 52b. The first plate member 51a and the first elastic member 51b are members different from each other in at least one of material and rigidity. The second plate member 52a and the second elastic member 52b are members different from each other in at least one of material and rigidity.

In this embodiment, the first plate member 51a and the second plate member 52a are made of the same material, and the first elastic member 51b and the second elastic member 52b are made of the same material. FIG. 11 is a schematic diagram of the first plate member 51a and the second plate member 52a viewed from the top to the bottom. The first plate member 51a and the second plate member 52a shown in FIG. 11 represent the state immediately before the tubular film F starts to be ironed. FIG. 11 shows the first pressing member 51c and the second pressing member 52c.

The first plate member 51a has a body portion 155a, a projecting portion 155b, and a contact portion 155c. The second plate member 52a has the same shape as the first plate member 51a, and has a body portion 155a, a projecting portion 155b, and a resin portion 155c. The second plate member 52a has the same shape as the first plate member 51a.

The body portion 155a is a portion that comes into contact with the tubular film F while the squeezing members 51 and 52 are squeezing the tubular film F. As shown in FIG. The body portion 155a is a metal plate that extends in the left-right direction (horizontal sealing direction) and is arranged parallel to the horizontal plane. The laterally extending end of the body portion 155a of the first plate member 51a faces the laterally extending end of the body portion 155a of the second plate member 52a. The horizontal dimension of the main body portion 155a is longer than the horizontal dimension of the tubular film F. As shown in FIG. As shown in FIG. 11, the first pressing member 51c is, for example, a spring attached to both ends of the front end portion of the body portion 155a of the first plate member 51a extending in the left-right direction. The second pressing member 52c is, for example, a spring attached to both ends of the rear end of the body portion 155a of the second plate member 52a extending in the left-right direction.

The protruding portion 155b is a portion that protrudes in the front-rear direction at one end in the left-right direction of the main body portion 155a. The projecting portion 155b of the first plate member 51a projects toward the second plate member 52a (rear side), and the projecting portion 155b of the second plate member 52a projects toward the first plate member 51a (front side). .

The contact portion 155c is a portion with which the projecting portion 155b contacts while the squeezing members 51 and 52 are squeezing the tubular film F. As shown in FIG. While the squeezing members 51 and 52 are squeezing the tubular film F, the contact portion 155c of the first plate member 51a contacts the projecting portion 155b of the second plate member 52a, and the contact portion 155c of the second plate member 52a , and the projecting portion 155b of the first plate member 51a.

While the squeezing members 51 and 52 are squeezing the tubular film F, the projecting portion 155b forms a gap (front and rear) between the body portion 155a of the first plate member 51a and the body portion 155a of the second plate member 52a. It is a member for providing a direction interval). That is, as will be described later, while the squeezing members 51 and 52 are squeezing the tubular film F, the first squeezing member 51 and the second squeezing member 52 maintain the elasticity of the first pressing member 51c and the second pressing member 52c. Forces push each other forward and backward. At this time, the protruding portion 155b of one of the pair of squeezing members 51 and 52 contacts the contact portion 155c of the other, so that the body portion 155a of the first plate member 51a and the body portion 155a of the second plate member 52a are brought into contact with each other. contact is avoided. The projecting portion 155b is designed so that the gap between the body portion 155a of the first plate member 51a and the body portion 155a of the second plate member 52a is about 1 mm. The contact portion 155c is preferably covered with an elastic member such as resin or rubber in order to suppress the sound generated when the contact portion 155c collides with the projecting portion 155b.

In this embodiment, the first elastic member 51b and the second elastic member 52b are made of the same material and have the same shape. The first elastic member 51b and the second elastic member 52b are made of a material having a lower elastic modulus in the longitudinal direction than the first plate member 51a and the second plate member 52a. Specifically, the first elastic member 51b and the second elastic member 52b are made of sponge. In FIG. 9, the tip of the first elastic member 51b protrudes rearward from the tip of the first plate member 51a (the tip of the projecting portion 155b), and the tip of the second elastic member 52b extends from the tip of the second plate member 52a. (tip of projecting portion 155b).

As shown in FIGS. 9 and 10, the first elastic member 51b is attached to the lower surface of the first plate member 51a, and the second elastic member 52b is attached to the lower surface of the second plate member 52a. That is, the first elastic member 51b and the second elastic member 52b are provided downstream of the first plate member 51a and the second plate member 52a in the transport direction of the tubular film F. As shown in FIG. The lateral dimension of the first elastic member 51b and the second elastic member 52b is longer than the lateral dimension of the tubular film F. As shown in FIG.

The first plate member 51a of the first squeezing member 51 and the second plate member 52a of the second squeezing member 52 move downward while a slight gap is opened inside the tubular film F. . At this time, the first elastic member 51b of the first squeezing member 51 and the second elastic member 52b of the second squeezing member 52 move downward in a state where there is no gap inside the tubular film F. . That is, while the squeezing members 51 and 52 are squeezing the tubular film F downward, the gap between the first elastic member 51b and the second elastic member 52b is the first plate member 51a and the second plate member 51a. It is smaller than the gap with the member 52a. Moreover, while the squeezing members 51 and 52 are squeezing the tubular film F downward, the first elastic member 51b and the second elastic member 52b are preferably in a state of pushing each other in the front-rear direction. . In this case, the first elastic member 51b and the second elastic member 52b hold elastic energy accompanying deformation in the front-rear direction.

(3) Operation of the bag-making and packaging machine First, the outline of the operation of the bag-making and packaging machine 1 filling the bag X with the articles P will be described. The film Fa supplied from the film supply unit 94 to the forming mechanism 73 is wound around the tube 2 to be formed into a cylindrical shape, and conveyed downward by the pull-down belt mechanism 74 . At this time, both ends of the cylindrical film Fa wound around the tube 2 are overlapped in the vertical direction. The overlapping portion of the cylindrically shaped film Fa is vertically sealed by a vertical sealing mechanism 4 to form a cylindrical film F. As shown in FIG.

The longitudinally sealed cylindrical film F exits the tube 2 and is transported downward to the lateral sealing mechanism 5 . In the horizontal sealing mechanism 5, a pair of sealing jaws 11a and 11b sandwich the tubular film F in the front-rear direction. At this time, below the sealing jaws 11a and 11b, the pair of squeezing members 51 and 52 also sandwich the tubular film F in the front-rear direction. Articles P discharged from the combination weighing unit 92 are present below the squeezing members 51 and 52 .

Next, the pair of sealing jaws 11a, 11b and the pair of squeezing members 51, 52 sandwiching the tubular film F move downward faster than the tubular film F being conveyed downward. At this time, the tubular film F is squeezed downward by the squeezing members 51 and 52, and the articles P adhering to the inner surface of the tubular film F are removed at the portion where the tubular film F is laterally sealed. fall downwards.

Next, the tubular film F is laterally sealed by the pair of sealing jaws 11a and 11b at the portion where the tubular film F is squeezed by the squeezing members 51 and 52. As shown in FIG. By this lateral sealing operation, a bag X containing articles P is formed below the pair of sealing jaws 11a and 11b. This bag X is connected with a tubular film F that follows. As shown in FIG. 3, the pair of sealing jaws 11a and 11b perform a box motion in which part of the trajectory is rectangular. The box motion of the pair of sealing jaws 11a and 11b is performed by speed change control of the horizontal movement servomotor 23 and the vertical movement servomotor 31, and switching control of the vertical movement servomotor 31 between forward rotation and reverse rotation.

While the tubular film F is being laterally sealed, the articles P weighed by the combination weighing unit 92 drop inside the tube 2, and fall into the tube above the portion sandwiched by the pair of sealing jaws 11a and 11b. An article P is put into the film F.

Next, when the lateral sealing by the pair of sealing jaws 11a and 11b is completed, the pair of sealing jaws 11a and 11b and the pair of squeezing members 51 and 52 are separated from each other in the front-rear direction.

Next, the laterally sealed portion of the tubular film F is laterally cut by a cutter accommodated in the jaw base 12b to which the second sealing jaw 11b is attached. As a result, the bag X containing the article P is separated from the subsequent tubular film F.

As described above, the bags X containing the articles P are continuously manufactured. The manufactured bag X is then guided by a belt conveyor (not shown) and transported to devices such as a thickness checker and a weight checker, which are used in subsequent processes.

(4) Features (4-1)
The bag making and packaging machine 1 includes a pair of squeezing members 51 and 52 for suppressing the articles P from being caught when the lateral sealing mechanism 5 laterally seals the tubular film F. As shown in FIG. The pair of squeezing members 51 and 52 each have a member for squeezing down the article P adhering to the inner side of the tubular film F. As shown in FIG. Specifically, the first squeezing member 51 has a first plate member 51a and a first elastic member 51b that are different in at least one of material and rigidity, and the second squeezing member 52 has at least one of material and rigidity. It has a second plate member 52a and a second elastic member 52b that are different from each other.

In this embodiment, the first plate member 51a and the second plate member 52a are made of metal with high rigidity. Therefore, when the tubular film F is sandwiched between the first plate member 51a and the second plate member 52a and squeezed, a relatively thick foreign object such as the content C of the article P is attached to the inside of the tubular film F. In this case, the foreign matter can be effectively scraped off.

On the other hand, in the present embodiment, the first elastic member 51b and the second elastic member 52b are made of sponge with low rigidity. The first elastic member 51b and the second elastic member 52b squeeze the tubular film F downward while pressing the tubular film F in opposite directions. Therefore, when the tubular film F is sandwiched and squeezed by the first elastic member 51b and the second elastic member 52b, and thin foreign matter such as the packaging material M of the article P adheres to the inside of the tubular film F, the Foreign matter can be effectively scraped off. In particular, the first elastic member 51b and the second elastic member 52b are used to remove foreign matter that cannot be scraped off by the first plate member 51a and the second plate member 52a, specifically, the first plate member 51a and the second plate member 52a. Foreign matter smaller than the distance between them (approximately 1 mm) can be effectively scraped off.

The form-fill-seal machine 1 can effectively suppress the occurrence of the articles P in which the contents C are wrapped in the packaging material M from being caught. The reason will be described with reference to FIG. FIG. 12 is an enlarged view of the vicinity of the squeezing members 51 and 52 in FIG. As shown in FIG. 12, while the squeezing members 51 and 52 sandwich and squeeze the tubular film F, the first plate member 51a and the second plate member 52a are separated from each other by about 1 mm in the front-rear direction. Due to the gap formed between the first plate member 51a and the second plate member 52a, when the squeezing members 51 and 52 squeeze the tubular film F, the first plate member 51a and the second plate member 52a having high rigidity are separated. Therefore, damage to the tubular film F is suppressed. However, this gap also forms a gap inside the tubular film F sandwiched between the first plate member 51a and the second plate member 52a. Therefore, when the packaging material M of the article P enters this gap, the first plate member 51a and the second plate member 52a may not be able to squeeze the packaging material M downward. On the contrary, the first plate member 51a and the second plate member 52a are capable of squeezing downward the content C of the article P which is larger than the gap.

However, as shown in FIG. 12, the first elastic member 51b and the second elastic member 52b are sponges and have elasticity in the front-rear direction. Therefore, the first elastic member 51b and the second elastic member 52b can squeeze the tubular film F downward while pressing the tubular film F against each other in the front-rear direction. At this time, no gap is formed inside the tubular film F sandwiched between the first elastic member 51b and the second elastic member 52b unless a foreign object exists. Further, even if a foreign object exists inside the tubular film F, when the first elastic member 51b and the second elastic member 52b squeeze the tubular film F, the first elastic member 51b and the second elastic member 52b Since the foreign objects are pressed against each other in the front-rear direction and move downward, the foreign objects are pushed downward and finally squeezed off. Therefore, the first elastic member 51b and the second elastic member 52b can also scrape off the wrapping material M of the article P adhering to the inner side of the tubular film F. Since the first elastic member 51b and the second elastic member 52b can be easily deformed, the tubular film F is prevented from being damaged when the tubular film F is squeezed.

As described above, in the bag making and packaging machine 1, the pair of squeezing members 51 and 52 are each composed of two types of members that differ from each other in at least one of the material and the rigidity. Foreign matter that cannot be scraped off by the second plate member 52a) can be scraped off by the other member (the first elastic member 51b and the second elastic member 52b). Specifically, when the first elastic member 51b and the second elastic member 52b do not exist, the packaging material M passes through between the first plate member 51a and the second plate member 52a to , 11b to be laterally sealed together with the tubular film F. If the packaging material M of the article P is laterally sealed together with the tubular film F by the pair of sealing jaws 11a and 11b, the airtightness of the bag X cannot be maintained. Therefore, the bag making and packaging machine 1 can suppress the occurrence of sealing failure due to the article P being caught by the pair of squeezing members 51 and 52 .

(4-2)
In the bag making and packaging machine 1, the first elastic member 51b and the second elastic member 52b are arranged downstream (lower) than the first plate member 51a and the second plate member 52a in the transport direction of the tubular film F. It is Therefore, if the first elastic member 51b and the second elastic member 52b can squeeze off the packaging material M of the article P adhering to the inner side of the tubular film F, the first plate member 51a and the second plate member 52a Therefore, the packaging material M of the article P is not bitten. When the packaging material M of the article P is bitten, the packaging material M of the article P is sandwiched between the pair of sealing jaws 11a and 11b together with the tubular film F and laterally sealed, so that a defective bag X is produced. . Therefore, the bag making and packaging machine 1 is configured such that the packaging material of the articles P is adjusted by the first elastic member 51b and the second elastic member 52b arranged on the downstream side (lower side) than the first plate member 51a and the second plate member 52a. It is possible to suppress the occurrence of sealing failure due to the biting of M.

(4-3)
In the bag making and packaging machine 1, the first elastic member 51b and the second elastic member 52b have a lower elastic modulus in the sandwiching direction (front-rear direction) than the first plate member 51a and the second plate member 52a, so that foreign matter can be sandwiched. Even in such a case, it can be elastically deformed according to the shape of the foreign matter. In addition, while the pair of squeezing members 51 and 52 are squeezing the tubular film F, the first elastic member 51b and the second elastic member 52b sandwich more than the first plate member 51a and the second plate member 52a. The gap in the direction (front-rear direction) is small.

Therefore, the first elastic member 51b and the second elastic member 52b can more effectively scrape off the foreign matter adhering to the inside of the tubular film F than the first plate member 51a and the second plate member 52a. In particular, when the foreign matter is smaller than the gap between the first plate member 51a and the second plate member 52a, for example, even when the foreign matter is the packaging material M of the article P, the first elastic member 51b and the second elastic member 51b and the second elastic member 51b The member 52b can scrape off the foreign matter.

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

(5-1) Modification A
In the bag making and packaging machine 1 of the embodiment, the first elastic member 51b and the second elastic member 52b are located downstream (lower side) than the first plate member 51a and the second plate member 52a in the transport direction of the tubular film F. ). However, in the transport direction of the tubular film F, the first elastic member 51b and the second elastic member 52b may be arranged upstream (upper side) than the first plate member 51a and the second plate member 52a.

FIG. 13 is a side view similar to FIG. 12, and is an enlarged view of the vicinity of the squeezing members 51 and 52 of this modification. In FIG. 13, the first elastic member 51b and the second elastic member 52b are arranged above the first plate member 51a and the second plate member 52a. Also in this modified example, the first elastic member 51b and the second elastic member 52b are more effective than the first plate member 51a and the second plate member 52a in squeezing off the foreign matter adhering to the inner side of the tubular film F. be able to. In particular, the first elastic member 51b and the second elastic member 52b can squeeze off the packaging material M of the article P adhering to the inside of the tubular film F. Therefore, also in this modified example, the bag making and packaging machine 1 can suppress the occurrence of sealing failure due to the packaging material M of the article P being caught by the first elastic member 51b and the second elastic member 52b.

(5-2) Modification B
In the bag making and packaging machine 1 of the embodiment, the first elastic member 51b and the second elastic member 52b are sponges. However, if the first elastic member 51b and the second elastic member 52b have a lower elastic modulus than the first plate member 51a and the second plate member 52a in the sandwiching direction of the tubular film F, that is, in the front-rear direction, A member other than a sponge may be used. Specifically, the first elastic member 51b and the second elastic member 52b are preferably formed of a soft material that does not damage the content C even when the content C of the article P of the embodiment is sandwiched. .

For example, coil springs may be used as the first elastic member 51b and the second elastic member 52b. FIG. 14 is a side view similar to FIG. 12, and is an enlarged view of the vicinity of the squeezing members 151 and 152 of this modification. In FIG. 14, the first plate member 151a and the second plate member 152a are the same members as the first plate member 51a and the second plate member 52a of the embodiment, and the first elastic member 151b and the second elastic member 152b are It is a helical spring extending in the left-right direction. In order to prevent the tubular film F from being caught, for example, a cloth may be wrapped around the helical spring with a sponge. FIG. 15 is a top view of the first elastic member 151b and the second elastic member 152b. FIG. 15 shows the tubular film F sandwiched between the first elastic member 151b and the second elastic member 152b. In FIG. 15, the first elastic member 151b, the second elastic member 152b, and the tubular film F are separated from each other for the sake of visibility. It is in contact with the tubular film F.

As shown in FIGS. 14 and 15, the first elastic member 151b and the second elastic member 152b have a lower elastic modulus in the sandwiching direction (front-rear direction) than the first plate member 151a and the second plate member 152a. Even when a foreign object is sandwiched, it can be elastically deformed according to the shape of the foreign object. In addition, while the pair of squeezing members 151 and 152 are squeezing the tubular film F, the first elastic member 151b and the second elastic member 152b sandwich more than the first plate member 151a and the second plate member 152a. The gap in the direction (front-rear direction) is small. Therefore, the first elastic member 151b and the second elastic member 152b can squeeze off the wrapping material M of the article P adhering to the inner side of the tubular film F. Therefore, also in this modified example, the bag making and packaging machine 1 can suppress the occurrence of sealing failure due to the packaging material M of the article P being caught by the first elastic member 151b and the second elastic member 152b.

(5-3) Modification C
In the bag making and packaging machine 1 of the embodiment, the first squeezing member 51 has the first plate member 51a and the first elastic member 51b that are different in at least one of the material and rigidity, and the second squeezing member 52 has the material and rigidity. It has a second plate member 52a and a second elastic member 52b that differ in at least one of rigidity from each other. In this manner, the squeezing members 51 and 52 are each composed of two types of members that are different from each other in at least one of the material and the rigidity. However, the squeezing members 51 and 52 may be composed of three or more types of members that differ from each other in at least one of material and rigidity. By using the squeezing members 51 and 52 composed of a plurality of types of members different in at least one of the material and rigidity, the bag making and packaging machine 1 of the present modification effectively prevents the occurrence of seal failure due to the articles P getting caught. can be effectively suppressed.

(5-4) Modification D
In the bag making and packaging machine 1 of the embodiment, the article P is a package in which the content C is wrapped with the packaging material M. As shown in FIG. In this case, it is preferable that the biting distance, which is the distance between the sealing jaws 11a, 11b and the squeezing members 51, 52 in the conveying direction of the tubular film F, is at least the excess margin of the packaging material M of the article P. . In FIG. 9, the biting distance is the distance between the lower ends of the sealing jaws 11a and 11b and the upper ends of the first plate member 51a and the second plate member 52a.

FIG. 16 is a diagram for explaining the surplus margin of the article P in this modified example. FIG. 16 shows an article P in which a content C is wrapped in a packaging material M. As shown in FIG. The surplus is the difference between the maximum dimension L1 of the packaging material M and the minimum dimension L2 of the contents C. When the biting distance is shorter than the surplus, only the packaging material M of the article P passes through between the first plate member 51a and the second plate member 52a, reaches the pair of sealing jaws 11a and 11b, and forms a cylindrical shape. There is a risk that it will be laterally sealed together with the film F. Therefore, it is preferable that the biting distance is at least the surplus of the article P. For example, when the excess margin of the article P is 15 mm, the bite distance is preferably 20 mm to 25 mm.

In this modification, since the biting distance is equal to or greater than the surplus of the article P, only the packaging material M of the article P does not pass through between the squeezing members 51 and 52 and reach the sealing jaws 11a and 11b. . In other words, since the distance between the sealing jaws 11a, 11b and the squeezing members 51, 52 is sufficiently secured, the article P can be is prevented from being pinched. Therefore, the bag making and packaging machine 1 of the present modified example can effectively suppress the occurrence of sealing failure due to the packaging material M of the article P being caught.

(5-5) Modification E
In the bag making and packaging machine 1 of the embodiment, the squeezing members 51 and 52 are respectively composed of two types of members that differ from each other in at least one of material and rigidity. With this configuration, the squeezing members 51 and 52 can suppress the occurrence of the wrapping material M of the article P being caught.

However, squeezing members 251 and 252, which will be described below, may be used in order to prevent the packaging material M of the article P from being caught. FIG. 17 is a diagram for explaining squeezing members 251 and 252 in this modification. FIG. 17 is similar to FIG. 12 and shows the vicinity of the squeezing members 251 and 252. FIG. The squeezing members 251, 252 are arranged below the sealing jaws (not shown).

The squeezing members 251 and 252 are composed of a first squeezing plate 251 and a second squeezing plate 252 . Each of the squeezing members 251 and 252 is a plate member made of highly rigid metal, like the first plate member 51a and the second plate member 52a of the embodiment. The first squeezing plate 251 is arranged above the second squeezing plate 252 (upstream in the conveying direction of the tubular film F). The vertical distance between the first squeezing plate 251 and the second squeezing plate 252 is approximately 2 mm to 3 mm.

The rear end of the first squeezing plate 251 and the front end of the second squeezing plate 252 are at the same position in the front-rear direction. That is, when the first squeezing plate 251 and the second squeezing plate 252 are viewed along the conveying direction (vertical direction) of the tubular film F, the first squeezing plate 251 and the second squeezing plate 252 are in contact with each other.

When the first squeezing plate 251 and the second squeezing plate 252 are viewed along the conveying direction of the tubular film F, the first squeezing plate 251 and the second squeezing plate 252 may partially overlap each other. In this case, in FIG. 17, the rear end portion of the first squeezing plate 251 is positioned rearward in the front-rear direction with respect to the front end portion of the second squeezing plate 252 .

In this modification, as shown in FIG. 17, even if a part of the packaging material M of the article P enters the gap between the first squeezing plate 251 and the second squeezing plate 252 from below, It is bent in the horizontal direction (front-rear direction) in the gap. Therefore, the packaging material M of the articles P is prevented from reaching the sealing jaws (not shown) above the squeezing members 251 and 252 .

Therefore, the bag making and packaging machine provided with the squeezing members 251 and 252 of the present modified example can effectively suppress the occurrence of sealing failure due to the packaging material M of the article P being caught.

The bag making and packaging machine according to this modified example
A bag making and packaging machine that manufactures a bag from a tubular packaging material and packages an article using the bag,
a conveying unit that conveys the packaging material downward;
a sealing portion that seals the packaging material in a lateral direction orthogonal to the direction in which the packaging material is conveyed by the conveying portion;
Before the sealing part seals the packaging material, a squeezing part that squeezes the packaging material by lowering faster than the packaging material that is conveyed downward by the conveying part while contacting the packaging material;
with
The squeezing part has a first squeezing member and a second squeezing member that come into contact with the packaging material when squeezing the packaging material,
The first squeezing member and the second squeezing member sandwich the packaging material in a sandwiching direction orthogonal to both the conveying direction and the lateral direction, and the positions in the conveying direction are different from each other.
It is a bag making and packaging machine.

Further, in the bag making and packaging machine according to the present modification, when viewed along the conveying direction, the first squeezing member and the second squeezing member are in contact with each other or at least partially overlap each other. preferably.

(5-6) Modification F
In the bag making and packaging machine 1 of the embodiment, the squeezing members 51 and 52 are respectively composed of two types of members that differ from each other in at least one of material and rigidity. With this configuration, the squeezing members 51 and 52 can suppress the occurrence of the wrapping material M of the article P being caught.

However, squeezing members 351a, 351b, 352a, and 352b, which will be described below, may be used in order to suppress the occurrence of the packaging material M of the article P being caught. FIG. 18 is a diagram for explaining squeezing members 351a, 351b, 352a, and 352b in this modification. FIG. 18 is a view similar to FIG. 12, showing the vicinity of the squeezing members 351a, 351b, 352a and 352b. The squeezing members 351a, 351b, 352a, 352b are arranged below sealing jaws (not shown).

The squeezing members 351a, 351b, 352a, 352b are composed of a first upper squeezing plate 351a, a second upper squeezing plate 352a, a first lower squeezing plate 351b, and a second lower squeezing plate 352b. Each of the squeezing members 351a, 351b, 352a, and 352b is a plate-like member made of highly rigid metal, like the first plate member 51a and the second plate member 52a of the embodiment.

The upper first squeezing plate 351a and the upper second squeezing plate 352a are arranged at the same height position (vertical position), like the first squeezing plate 51 and the second squeezing plate 52 of the embodiment. Similarly, the lower first squeezing plate 351b and the lower second squeezing plate 352b are arranged at the same height position. The upper first squeezing plate 351a and the upper second squeezing plate 352a are arranged above the first lower squeezing plate 351b and the second lower squeezing plate 352b (upstream in the conveying direction of the tubular film F). . The vertical distance between the upper first squeezing plate 351a and the upper second squeezing plate 352a and the lower first squeezing plate 351b and the lower second squeezing plate 352b is about 2 mm to 3 mm.

Between the upper first squeezing plate 351a and the upper second squeezing plate 352a, an upper gap 353a of about 1 mm is formed in the front-rear direction. A lower gap 353b of about 1 mm is formed in the front-rear direction between the lower first squeezing plate 351b and the lower second squeezing plate 352b. In the front-rear direction, the position of the upper gap 353a is different from the position of the lower gap 353b. Specifically, the upper gap 353a is shifted rearward by about 2 mm to 3 mm relative to the lower gap 353b.

In this modified example, as shown in FIG. 18, even if a part of the packaging material M of the article P enters the lower gap 353b from below, the upper side gap 353b exists above the lower gap 353b in the vertical direction. 1 It is bent in the horizontal direction by the ironing plate 351a. Therefore, the wrapping material M of the articles P is suppressed from reaching the sealing jaws (not shown) above the squeezing members 351a, 351b, 352a, 352b.

Therefore, the bag making and packaging machine provided with the squeezing members 351a, 351b, 352a, and 352b of this modified example can effectively suppress the occurrence of sealing failure due to the packaging material M of the article P being caught.

The bag making and packaging machine according to this modified example
A bag making and packaging machine that manufactures a bag from a tubular packaging material and packages an article using the bag,
a conveying unit that conveys the packaging material downward;
a sealing portion that seals the packaging material in a lateral direction orthogonal to the direction in which the packaging material is conveyed by the conveying portion;
Before the sealing part seals the packaging material, a squeezing part that squeezes the packaging material by lowering faster than the packaging material that is conveyed downward by the conveying part while contacting the packaging material;
with
The squeezing part has a pair of upper squeezing members and a pair of lower squeezing members that come into contact with the packaging material when squeezing the packaging material,
The pair of upper squeezing members includes an upper first squeezing member and a second upper squeezing member that sandwich the packaging material in a sandwiching direction orthogonal to both the conveying direction and the lateral direction,
The pair of lower squeezing members has a first lower squeezing member and a second lower squeezing member that sandwich the packaging material in the sandwiching direction,
In the sandwiching direction, the position of the upper gap between the upper first squeezing member and the upper second squeezing member is the lower gap between the lower first squeezing member and the lower second squeezing member. different from the position of
It is a bag making and packaging machine.

1 bag making and packaging machine 5 horizontal sealing mechanism (sealing part)
11a First sealing jaw 11b Second sealing jaw 51 First squeezing member (squeezing part)
51a first plate member (first contact member)
51b first elastic member (second contact member)
52 Second squeezing member (squeezing part)
52a second plate member (first contact member)
52b second elastic member (second contact member)
74 pull-down belt mechanism (conveyor)
C Contents P Goods F Cylindrical film (tubular packaging material)
X bag

JP 2008-174289 A

Claims (8)

A bag making and packaging machine that manufactures a bag from a tubular packaging material and packages an article using the bag,
a conveying unit that conveys the packaging material downward;
a sealing portion that seals the packaging material in a lateral direction orthogonal to the direction in which the packaging material is conveyed by the conveying portion;
Before the sealing part seals the packaging material, a squeezing part that squeezes the packaging material by lowering faster than the packaging material that is conveyed downward by the conveying part while contacting the packaging material;
with
The squeezing section has a first contact member and a second contact member that come into contact with a portion of the packaging material in which the seal portion laterally seals the packaging material when the packaging material is squeezed,
the first contact member and the second contact member are different in material and rigidity,
The first contact member and the second contact member are a pair of members that sandwich the packaging material in a sandwiching direction perpendicular to both the conveying direction and the lateral direction,
The second contact member is arranged upstream or downstream of the first contact member in the conveying direction,
Bag making and packaging machine. The second contact member has a lower elastic modulus in the sandwiching direction than the first contact member,
The bag making and packaging machine according to claim 1 . While the squeezing part is squeezing the packaging material, the gap in the pinching direction between the second contact members is smaller than the gap in the pinching direction between the first contact members,
The bag making and packaging machine according to claim 2 . When the article is sandwiched between the second contact members, the second contact member can be elastically deformed according to the shape of the article.
The bag making and packaging machine according to claim 2 or 3 . The second contact member is a sponge or a helical spring arranged to extend in the lateral direction.
The bag making and packaging machine according to any one of claims 2 to 4 . The second contact member is arranged downstream of the first contact member in the conveying direction,
The bag making and packaging machine according to any one of claims 2 to 5 . The article is a package in which the contents are packaged,
The bag making and packaging machine according to any one of claims 1 to 6 . The distance between the sealing portion and the squeezing portion in the conveying direction is at least the difference between the maximum dimension of the package and the minimum dimension of the contents packaged in the package. be,
The bag making and packaging machine according to claim 7 .

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