JP7432235B2 - Bag making and packaging machine - Google Patents

Description

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

Conventionally, as described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-6387), a bag making and packaging machine has been used which is equipped with a vertical sealing mechanism that seals both side edges of the film to form the film into a cylindrical shape. It is being This vertical sealing mechanism heat-seals the film by sandwiching the side edges of the film with their palms together between a pair of sealing jaws.

However, when the bag making and packaging machine stops operating, the side edge of the film before being sealed may be located between the pair of sealing jaws. In this case, the film side edge may be deformed by the heat of the sealing jaws, and the film side edge may not be properly sandwiched between the pair of sealing jaws when the operation is restarted.

An object of the present invention is to provide a bag making and packaging machine that suppresses the occurrence of vertical seal defects.

The bag making and packaging machine according to the first aspect of the present invention includes a vertical sealing mechanism that seals both side edges of the film to form the film into a cylindrical shape. The bag making and packaging machine includes a control section that controls the bag making and packaging machine. The vertical sealing mechanism has a pair of heat sealing parts and a conveyance part. The pair of heat-sealing parts heat-seal the film by sandwiching the side edges of the film with their palms together. The transport unit transports the film along its longitudinal direction. The control unit repeats the following cycle operations (a) to (d) while the bag making and packaging machine is in operation.
(a) Move the heat-sealing part from the first position where the side edges of the film are not sandwiched to the second position where the side edges of the film are sandwiched.
(b) Thereafter, the heat-sealing parts sandwiching the side edges of the film are moved along the longitudinal direction of the film in conjunction with the transport of the film by the transporting part.
(c) After that, the sandwiching of the side edges of the film by the heat sealing part is released.
(d) After that, move the heat seal part to the first position.

When the control unit receives a stop signal from the bag making and packaging machine during execution of a cycle operation, after finishing the cycle operation in progress, the control unit moves the side edge of the film to be heat sealed in the next cycle operation to the heat seal unit. After that, the film side edges are released from being pinched by the heat sealing section, and then the bag making and packaging machine is stopped.

When the bag making and packaging machine according to the first aspect receives an operation stop signal during the vertical sealing cycle operation, the bag making and packaging machine stops the operation after completing the vertical sealing of the part to be vertically sealed in the next cycle operation. This suppresses deformation of the side edges of the film before being vertically sealed due to the heat of the heat-sealed portion. Therefore, this bag making and packaging machine can suppress the occurrence of problems with vertical seals.

The bag making and packaging machine according to the second aspect of the present invention includes a vertical sealing mechanism that seals both side edges of the film to form the film into a cylindrical shape. The bag making and packaging machine includes a control section that controls the bag making and packaging machine. The vertical sealing mechanism has a pair of heat sealing parts and a conveyance part. The pair of heat-sealing parts heat-seal the film by sandwiching the side edges of the film with their palms together. The transport unit transports the film along its longitudinal direction. The control unit repeats the following cycle operations (a) to (d) while the bag making and packaging machine is in operation.
(a) Move the heat-sealing part from the first position where the side edges of the film are not sandwiched to the second position where the side edges of the film are sandwiched.
(b) Thereafter, the heat-sealing parts sandwiching the side edges of the film are moved along the longitudinal direction of the film in conjunction with the transport of the film by the transporting part.
(c) After that, the sandwiching of the side edges of the film by the heat-sealing part is released.
(d) After that, move the heat seal part to the first position.

When the control unit receives a stop signal from the bag making and packaging machine during execution of a cycle operation, the control unit releases the sandwiching of the side edge of the film by the heat seal unit in the cycle operation being executed, and then stops the heat seal unit. The bag making and packaging machine is stopped before moving to the first position.

When the bag making and packaging machine according to the second aspect receives an operation stop signal during the vertical sealing cycle operation, the bag making and packaging machine stops the operation after completing the vertical sealing of the portion to be vertically sealed in the ongoing cycle operation. This suppresses deformation of the side edges of the film before being vertically sealed due to the heat of the heat-sealed portion. Therefore, this bag making and packaging machine can suppress the occurrence of problems with vertical seals.

A bag making and packaging machine according to a third aspect of the present invention is the bag making and packaging machine according to the first aspect, in which the first position is such that the heat sealing part sandwiching the side edges of the film is placed along the length of the film in the cycle operation. This is the position of the heat-sealed portion in the longitudinal direction of the film before it is moved along the direction.

A bag making and packaging machine according to a fourth aspect of the present invention is the bag making and packaging machine according to the second aspect, in which the first position is such that the heat sealing part sandwiching the side edges of the film is placed along the longitudinal direction of the film. This is the position of the heat-sealed portion in the longitudinal direction of the film after being moved along the direction.

A bag making and packaging machine according to a fifth aspect of the present invention is the bag making and packaging machine according to the first aspect, wherein the control section controls the operation of the bag making and packaging machine after receiving a stop signal of the bag making and packaging machine. When restarting, the film is transported along its length by the distance traveled in one cycle operation before moving the heat seal section to the second position.

The bag making and packaging machine according to the present invention can suppress the occurrence of vertical seal defects.

FIG. 1 is a perspective view of a bag making and packaging machine 10 according to an embodiment. 1 is a perspective view showing a schematic configuration of a bag making and packaging unit 12. FIG. FIG. 3 is a perspective view of a portion of the film F formed into a cylindrical shape by a forming mechanism 21; 3 is a schematic side view of the lateral seal mechanism 23 viewed from the right side of FIG. 2. FIG. FIG. 3 is a cross-sectional view of a pair of heat seal parts 31 and 32. A state in which the side edge portions R1 and R2 are not sandwiched between the pair of heat seal portions 31 and 32 is shown. FIG. 3 is a cross-sectional view of a pair of heat seal parts 31 and 32. A state in which side edge portions R1 and R2 are sandwiched between a pair of heat seal portions 31 and 32 is shown. 3 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32. FIG. 3 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32. FIG. 3 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32. FIG. 3 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32. FIG. FIG. 3 is a diagram showing the cyclic operation of the pair of heat seal parts 31 and 32 viewed from above. FIG. 3 is a diagram showing the cyclic operation of the pair of heat seal parts 31 and 32 viewed from above. FIG. 3 is a diagram showing the cyclic operation of the pair of heat seal parts 31 and 32 viewed from above. FIG. 3 is a diagram showing the cyclic operation of the pair of heat seal parts 31 and 32 viewed from above. 5 is a time chart of the operation of the vertical sealing mechanism 22. FIG. FIG. 6 is a diagram for explaining a problem when the control unit 16 does not vertically seal a portion to be vertically sealed in the next cycle operation being executed. FIG. 6 is a diagram for explaining a problem when the control unit 16 does not vertically seal a portion to be vertically sealed in the next cycle operation being executed. 5 is a time chart of the operation of the vertical seal mechanism 22 in Modification A. 7 is a front view showing the cyclic operation of a pair of heat seal parts 31 and 32 in modification B. FIG. 7 is a front view showing the cyclic operation of a pair of heat seal parts 31 and 32 in modification B. FIG. 7 is a front view showing the cyclic operation of a pair of heat seal parts 31 and 32 in modification B. FIG. 7 is a front view showing the cyclic operation of a pair of heat seal parts 31 and 32 in modification B. FIG.

Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is one of the specific examples of the present invention, and does not limit the technical scope of the present invention.

(1) Overall configuration FIG. 1 is a perspective view of a bag making and packaging machine 10 according to an embodiment of the present invention. The bag making and packaging machine 10 is a device for packing articles such as food into bags. The bag making and packaging machine 10 mainly includes a combination weighing unit 11, a bag making and packaging unit 12, and a film supply unit 13.

The combination weighing unit 11 is arranged above the bag making and packaging unit 12. The combination weighing unit 11 measures the weight of articles using a plurality of weighing hoppers, and combines the weight values measured by each weighing hopper so as to obtain a predetermined total weight. The combination weighing unit 11 discharges articles having a predetermined total weight downward and supplies them to the bag making and packaging unit 12 .

The bag making and packaging unit 12 seals and packages the article in a bag in accordance with the timing when the article is supplied from the combination weighing unit 11. The bag making and packaging unit 12 forms the film supplied from the film supply unit 13 into a bag, while putting articles into the bag and sealing the bag.

The film supply unit 13 is installed adjacent to the bag making and packaging unit 12 and supplies film to the bag making and packaging unit 12. The film supply unit 13 continuously unwinds a film from a film roll around which a sheet-like film is wound, and supplies the film to the bag making and packaging unit 12 .

The bag making and packaging machine 10 includes an operation switch 14 and a liquid crystal display 15. The operation switch 14 and the liquid crystal display 15 are attached to the front of the main body of the bag making and packaging machine 10. The operation switch 14 is arranged at a position where the operator of the bag making and packaging machine 10 can operate it. The liquid crystal display 15 is arranged at a position where the operator of the bag making and packaging machine 10 can view it. The liquid crystal display 15 is a touch panel type display. The operation switch 14 and the liquid crystal display 15 function as input devices that receive instructions to the bag making and packaging machine 10 and settings regarding the bag making and packaging machine 10. The liquid crystal display 15 functions as an output device that displays information regarding the bag making and packaging machine 10.

The bag making and packaging machine 10 includes a control section 16. The control unit 16 is a computer composed of a CPU, ROM, RAM, and the like. The control unit 16 is built into the main body of the bag making and packaging machine 10 and is connected to the combination weighing unit 11 , the bag making and packaging unit 12 , the film supply unit 13 , the operation switch 14 and the liquid crystal display 15 . The control unit 16 controls the combination weighing unit 11, the bag making and packaging unit 12, and the film supply unit 13 based on inputs from the operation switch 14 and the liquid crystal display 15, and outputs various information to the liquid crystal display 15.

(2) Configuration of the bag making and packaging unit 12 FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit 12. In the following explanation, six directions consisting of "front (front)", "rear (back)", "top", "bottom", "left" and "right" are defined as shown in Figure 2. .

The bag making and packaging unit 12 mainly includes a forming mechanism 21, a vertical sealing mechanism 22, and a horizontal sealing mechanism 23. The forming mechanism 21 forms the sheet-like film F supplied from the film supply unit 13 into a cylindrical shape. The vertical sealing mechanism 22 vertically seals the film F formed into a cylindrical shape by the forming mechanism 21 to form a cylindrical film Fc. The horizontal sealing mechanism 23 forms the bag B by horizontally sealing the cylindrical film Fc formed by the vertical sealing mechanism 22.

The bag making and packaging unit 12 forms bags B while continuously conveying the film F supplied from the film supply unit 13. While the bag making and packaging machine 10 is operating, the bag making and packaging unit 12 can continuously form the bags B from the film F without stopping the conveyance of the film F.

(2-1) Forming mechanism 21
The forming mechanism 21 includes a tube 21a and a former 21b. The tube 21a is a cylindrical member with open upper and lower ends. The article A supplied from the combination weighing unit 11 is put into the opening at the upper end of the tube 21a. The former 21b is arranged to surround the tube 21a. When the film F fed out from the film supply unit 13 passes through the gap between the tube 21a and the former 21b, it is wound around the tube 21a and formed into a cylindrical shape. The tube 21a and the former 21b can be replaced depending on the size of the bag B to be manufactured.

The film F formed into a cylindrical shape by the forming mechanism 21 has a pair of side edges R1 and R2 facing each other, as shown in FIG. A pair of side edges R1 and R2 are both ends of the film F in a direction perpendicular to the longitudinal direction LD of the film F. That is, the side edges R1 and R2 of the film F extend along the longitudinal direction LD of the film F. As shown in FIGS. 2 and 3, the pair of side edge portions R1 and R2 extend along the front-rear direction toward the front side of the cylindrical film F. The tube 21a and the former 21b have a shape such that the film F has a pair of side edges R1 and R2.

(2-2) Vertical seal mechanism 22
The vertical sealing mechanism 22 seals the film F formed into a cylindrical shape by the forming mechanism 21 in the vertical direction (in the vertical direction in FIG. 2). The vertical sealing mechanism 22 mainly includes a pair of heat sealing parts 31 and 32 and a conveying part 33.

The pair of heat seal parts 31 and 32 are arranged on the front side of the tube 21a. The pair of heat-sealing parts 31 and 32 have heaters, and heat-seal by sandwiching the side edges R1 and R2 on both sides of the cylindrical film F with their palms together. Heat sealing is a method in which a part of the film F is heated to temporarily soften it, and the softened parts are welded and sealed together. The pair of heat-sealing parts 31 and 32 vertically seal the side edges R1 and R2 on both sides of the film F to form a cylindrical film Fc. The pair of heat seal parts 31 and 32 have predetermined dimensions along the up and down direction.

The conveyance section 33 is arranged at a height near the pair of heat seal sections 31 and 32. The conveyance unit 33 conveys the film F wound around the tube 21a downward along the longitudinal direction LD. The conveying section 33 mainly includes a driving roller 33a, a driven roller 33b, and a pair of belts 33c. As shown in FIG. 2, the pair of belts 33c are arranged on both left and right sides of the tube 21a so as to sandwich the tube 21a. The pair of belts 33c has a mechanism for attracting the film F. In the conveying section 33, a pair of belts 33c are rotationally driven by a driving roller 33a and a driven roller 33b, thereby conveying the film F downward while adsorbing it. The vertical position of the cylindrical film F can be adjusted by the transport section 33.

(2-3) Horizontal seal mechanism 23
The lateral sealing mechanism 23 seals the cylindrical film Fc in the lateral direction (in the left-right direction in FIG. 2). The horizontal sealing mechanism 23 forms a bag B whose upper end and lower end are laterally sealed from the tubular film Fc. The horizontal sealing mechanism 23 is arranged below the forming mechanism 21 and the vertical sealing mechanism 22.

FIG. 4 is a schematic side view of the horizontal seal mechanism 23 seen from the right side of FIG. The horizontal seal mechanism 23 mainly includes a first rotating body 50a and a second rotating body 50b. The first rotating body 50a is arranged on the front side of the cylindrical film Fc. The second rotating body 50b is arranged on the rear side of the cylindrical film Fc.

The first rotating body 50a mainly includes a first rotating shaft 53a, a first sealing jaw 51a, and a second sealing jaw 52a. The second rotating body 50b mainly includes a second rotating shaft 53b, a first seal jaw 51b, and a second seal jaw 52b. The first rotary body 50a rotates around the rotation center C1 of the first rotation shaft 53a, with the first rotation shaft 53a as the rotation axis, when viewed along the left-right direction. The second rotary body 50b rotates around the rotation center C2 of the second rotation shaft 53b, with the second rotation shaft 53b as the rotation axis, when viewed along the left-right direction. When the horizontal seal mechanism 23 is viewed along the left-right direction, the pair of first seal jaws 51a, 51b rotates synchronously in opposite directions, and the pair of second seal jaws 52a, 52b rotates synchronously in opposite directions. Rotate. In FIG. 4, the trajectories of the pair of first sealing jaws 51a, 51b and the pair of second sealing jaws 52a, 52b are shown by chain lines.

The lateral sealing mechanism 23 uses a pair of first sealing jaws 51a, 51b or a pair of second sealing jaws 52a, 52b to seal the cylindrical film Fc along the lateral direction intersecting the conveyance direction of the cylindrical film Fc. Insert. The pair of first seal jaws 51a, 51b and the pair of second seal jaws 52a, 52b have heaters. The pair of first sealing jaws 51a, 51b or the pair of second sealing jaws 52a, 52b sandwich and heat seal the cylindrical film Fc, thereby laterally sealing the cylindrical film Fc.

(3) Operation of the bag making and packaging machine 10 (3-1) Overall operation An outline of the operation of the bag making and packaging machine 10 for sealing the article A into the bag B will be explained.

The film F supplied from the film supply unit 13 to the bag making and packaging unit 12 is formed into a cylindrical shape by the forming mechanism 21 and then vertically sealed by a pair of heat seal parts 31 and 32 of the vertical sealing mechanism 22. , a cylindrical film Fc is formed.

The cylindrical film Fc is continuously conveyed downward by the conveyance section 33 of the vertical sealing mechanism 22, while being horizontally conveyed at predetermined intervals along the longitudinal direction LD (vertical direction) of the film F by the horizontal sealing mechanism 23. Sealed. The horizontal sealing mechanism 23 performs horizontal sealing by sandwiching the cylindrical film Fc between a pair of first sealing jaws 51a, 51b or a pair of second sealing jaws 52a, 52b.

Immediately after the cylindrical film Fc is laterally sealed by the lateral sealing mechanism 23, the article A weighed by the combination weighing unit 11 falls within the tube 21a and is thrown into the cylindrical film Fc. The article A inserted into the cylindrical film Fc remains above the portion that was horizontally sealed immediately before. When the cylindrical film Fc is next laterally sealed by the lateral sealing mechanism 23, the lateral sealing mechanism 23 seals the cylindrical film Fc at a height position above the article A that was previously put into the cylindrical film Fc. Seal horizontally. Thereby, the article A within the cylindrical film Fc is sandwiched between the upper and lower horizontally sealed portions and sealed.

At the timing when the cylindrical film Fc is laterally sealed, a cutter (not shown) built in the first sealing jaw 51a or the second sealing jaw 52a is used to seal the cylindrical film Fc laterally. cut in the direction. As a result, the bag B containing the article A is separated from the subsequent cylindrical film Fc.

Through the above steps, the bag B in which the article A is enclosed is continuously manufactured. The manufactured bag B is then transferred to devices such as a thickness checker and a weight checker by a belt conveyor or the like.

The bag making and packaging machine 10 may perform bag making in the form of a continuous bag in which a plurality of bags B are connected. In this case, each time a predetermined number of bags B are formed by the horizontal sealing mechanism 23, the horizontally sealed portion of the cylindrical film Fc is cut in the horizontal direction.

(3-2) Operation of the vertical sealing mechanism 22 The vertical sealing mechanism 22 has a pair of heat sealing parts 31 and 32 that sandwich the side edges R1 and R2 on both sides of the cylindrical film F with their palms together. Heat seal. 5 and 6 are cross-sectional views of the pair of heat seal parts 31 and 32. 5 and 6 are cross-sectional views taken along a plane perpendicular to the vertical direction. FIG. 5 shows a state in which the side edge portions R1 and R2 are not sandwiched between the pair of heat seal portions 31 and 32. FIG. 6 shows a state in which side edge portions R1 and R2 are sandwiched between a pair of heat seal portions 31 and 32. As shown in FIGS. 5 and 6, the side edges R1 and R2 on both sides of the film F wound around the tube 21a are close to each other, and when viewed along the vertical direction, the radial direction of the tube 21a is along the front-back direction. Since the side edge portions R1 and R2 extend along the longitudinal direction LD of the film F, the side edge portions R1 and R2 are heat-sealed and welded together using the pair of heat-sealed portions 31 and 32 to form a cylindrical shape. The formed film F is vertically sealed.

The pair of heat seal parts 31 and 32 are composed of a first heat seal part 31 and a second heat seal part 32. The first heat seal part 31 and the second heat seal part 32 are configured to be movable within a predetermined range along the vertical direction by a drive motor. The drive motor can change the vertical positions of the first heat seal section 31 and the second heat seal section 32 in synchronization with each other. The second heat seal portion 32 is configured to be movable within a predetermined range along the left-right direction by an air cylinder. In the air cylinder, the distance between the first heat seal part 31 and the second heat seal part 32 in the left and right direction can be changed. By the air cylinder changing this interval, the first heat sealing part 31 and the second heat sealing part 32 can sandwich the side edges R1 and R2 or release the sandwiched state of the side edges R1 and R2. can do. As shown in FIGS. 5 and 6, when the first heat-sealed part 31 and the second heat-sealed part 32 sandwich the side edges R1 and R2, the first heat-sealed part 31 comes into contact with the side edge R1. , the second heat seal portion 32 contacts the side edge portion R2. The second heat-sealing section 32 has a built-in heater for heating the side edges R1, R2 while sandwiching the side edges R1, R2 together with the first heat-sealing section 31. On the other hand, the first heat seal section 31 does not include such a heater.

While the bag making and packaging machine 10 is in operation, the control unit 16 controls the vertical sealing mechanism 22 to adjust the positions of the pair of heat seal parts 31 and 32 and the position of the cylindrical film F. can do. The control unit 16 performs a cyclic operation to periodically change the positions of the pair of heat seal parts 31 and 32, as described below.

FIG. 7 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32. FIG. 8 is a diagram of the cycle operation of the pair of heat seal parts 31 and 32 viewed from above. FIG. 8 is a cross-sectional view of the pair of heat seal parts 31 and 32 at a height position. FIGS. 7(a) to (d) correspond to FIGS. 8(a) to (d), respectively. As shown in FIGS. 7 and 8, during the cycle operation, the first heat-sealing section 31 reciprocates within a predetermined range along the vertical direction, and the second heat-sealing section 32 reciprocates within a predetermined range in the horizontal and vertical directions. Repeat the box motion by moving within a predetermined range along. During the cycle operation, the first heat seal portion 31 is in contact with the side edge R1 or is located extremely close to the side edge R1 in the left-right direction. The "extremely close position" is, for example, a position where the distance between the first heat seal part 31 and the side edge R1 is less than 1 mm.

While the pair of heat-sealing parts 31 and 32 are performing the cycle operation, the cylindrical film F and the cylindrical film Fc are being transported downward by the transporting part 33. Next, the control by the control section 16 during execution of the cycle operation of the pair of heat seal sections 31 and 32 will be explained with reference to FIGS. 7 and 8.

First, as shown in FIGS. 7(a) and 8(a), the pair of heat seal parts 31 and 32 are in a first position P1 where the side edges R1 and R2 of the film F are not sandwiched. Specifically, the first position P1 is a position where the distance between the second heat seal part 32 and the side edge R2 is equal to or greater than a predetermined length. The predetermined length is a length such that deformation of the side edge portions R1 and R2 of the film F due to the heat of the second heat seal portion 32 is sufficiently small. The predetermined length depends on the material of the film F and the temperature of the second heat-sealed portion 32, but is, for example, at least 30 mm. In FIGS. 7A and 8A, the pair of heat seal parts 31 and 32 are located at the uppermost position in their vertically movable range. The first position P1 is the starting point of the cycle operation.

Next, the control unit 16 moves the pair of heat seal parts 31 and 32 located at the first position P1 where the side edges R1 and R2 of the film F are not sandwiched, to the second position where the side edges R1 and R2 of the film F are sandwiched. Move to P2. In FIGS. 7(b) and 8(b), the pair of heat seal parts 31 and 32 are in the second position P2. The control unit 16 moves the pair of heat seal parts 31 and 32 from the first position P1 to the second position P2 by moving the second heat seal part 32 to the left and bringing it closer to the first heat seal part 31. let The pair of heat seal parts 31 and 32 located at the second position P2 contact the side edges R1 and R2, respectively, and heat the side edges R1 and R2. In FIGS. 7(b) and 8(b), the pair of heat seal parts 31 and 32 are located at the uppermost position in their vertically movable range.

Next, the control unit 16 moves the pair of heat-sealed parts 31 and 32 sandwiching the side edges R1 and R2 along the longitudinal direction LD in conjunction with the downward conveyance of the film F by the conveyance unit 33. Move it downward. That is, the pair of heat seal parts 31 and 32 move downward by a predetermined distance at the same speed as the transport speed of the film F while sandwiching the side edges R1 and R2. In FIGS. 7(c) and 8(c), the pair of heat seal parts 31 and 32 are located at the third position P3 below the second position P2. In FIGS. 7(c) and 8(c), the pair of heat seal parts 31 and 32 are located at the lowest position in their vertically movable range. The pair of heat-sealing parts 31 and 32 heat-seal the side edges R1 and R2 of the film F while moving from the second position P2 to the third position P3.

Next, the control unit 16 releases the pair of heat seal parts 31 and 32 from sandwiching the side edge parts R1 and R2. Specifically, as shown in FIGS. 7(d) and 8(d), the control unit 16 moves the second heat sealing part 32 to the right and separating it from the first heat sealing part 31. , the side edge portions R1 and R2 are not sandwiched between the pair of heat seal portions 31 and 32. In this state, the side edges R1 and R2 have been heat-sealed, and the vertical sealing of the film F in the current cycle operation has been completed. In FIGS. 7(d) and 8(d), the pair of heat seal parts 31 and 32 are located at the fourth position P4, which is the lowest position in the movable range in the vertical direction.

Next, the control section 16 moves the first heat seal section 31 and the second heat seal section 32 upward along the longitudinal direction LD. Thereby, the pair of heat seal parts 31 and 32 move from the fourth position P4 to the first position P1, and enter the state shown in FIGS. 7(a) and 8(a).

In the present embodiment, the first position P1 is the position of the pair of heat seal parts 31 and 32 sandwiching the side edges R1 and R2 of the film F before moving along the longitudinal direction LD in the cycle operation. This is the position of the heat seal parts 31 and 32 in the longitudinal direction LD. That is, the first position P1 is the uppermost position in the vertical movable range of the pair of heat seal parts 31 and 32.

The vertical dimension of the pair of heat seal parts 31 and 32 is, for example, 350 mm, although it depends on the dimensions of the film F and the bag B. The distance that the pair of heat seal parts 31 and 32 move in the vertical direction in one cycle operation, that is, the size of the range in which the pair of heat seal parts 31 and 32 can move in the vertical direction is, for example, 150 mm. Depending on the dimensions of the pair of heat seal parts 31, 32 and the vertical movement distance, the portions vertically sealed by the pair of heat seal parts 31, 32 may overlap each other in continuous cycle operations. In this case, the side edges R1 and R2 of the film F have regions that are vertically sealed multiple times by the pair of heat seal parts 31 and 32.

In this embodiment, when the control unit 16 receives a stop signal from the bag making and packaging machine 10 during execution of a cycle operation, the controller 16 terminates the cycle operation in progress, and then controls the side to be heat-sealed in the next cycle operation. After sandwiching the edges R1 and R2 between the pair of heat seal parts 31 and 32, and then releasing the sandwiching of the side edges R1 and R2 between the pair of heat seal parts 31 and 32, the bag making and packaging machine 10 is stopped. . Therefore, when the control unit 16 receives a stop signal for the bag making and packaging machine 10 during execution of the cycle operation, it does not immediately stop the bag making and packaging machine 10. Instead, the control unit 16 stops the bag making and packaging machine 10 after completing the cycle operation being executed and completing the vertical sealing of the side edges R1 and R2 that will be vertically sealed in the next cycle operation. let Next, details of this operation will be explained.

FIG. 9 is a time chart of the operation of the vertical sealing mechanism 22. The horizontal axis in FIG. 9 represents time. The leftmost time on the horizontal axis in FIG. 9 is time S0 at which the control unit 16 starts operating the bag making and packaging machine 10. FIG. 9A is a time chart of the operation of the transport section 33. The vertical axis of the chart in FIG. 9(a) represents the speed of the film F transported by the transport section 33. During operation of the bag making and packaging machine 10, the film F is transported downward along the longitudinal direction LD at a constant speed V by the belt 33c of the transport section 33. FIG. 9(b) is a time chart of the operation of the air cylinder for changing the position of the second heat seal portion 32 in the left and right direction. In FIG. 9(b), while the air cylinder is in the "OFF" state, the pair of heat seal parts 31 and 32 do not sandwich the side edges R1 and R2. While the air cylinder is in the "ON" state, the pair of heat seal parts 31 and 32 sandwich the side edge parts R1 and R2. FIG. 9(c) is a time chart of the operation of the drive motor for changing the vertical position of the pair of heat seal parts 31, 32. The vertical axis of the chart in FIG. 9(c) represents the speed of the pair of heat seal parts 31 and 32 in the vertical direction. In FIG. 9(c), the "DROP" side indicates that the pair of heat seal parts 31, 32 are moving downward, and the "RETURN" side indicates that the pair of heat seal parts 31, 32 are moving downward. Indicates moving upward. FIG. 9 shows a time S1 when the control unit 16 received a stop signal for the bag making and packaging machine 10, and a time S2 at which the control unit 16 restarted the operation of the bag making and packaging machine 10 after the bag making and packaging machine 10 was stopped. It is shown. One cycle operation is an operation performed during a period from the time when the position of the heat seal portion becomes the first position P1 to the time when the position of the heat seal part becomes the first position P1 again. As shown in FIG. 9, in the first cycle operation, the control unit 16 starts conveying the film F and at the same time moves the pair of heat sealing parts 31 and 32 in the vertical direction by a drive motor, but by an air cylinder The side edge portions R1 and R2 are not sandwiched between the pair of heat seal portions 31 and 32 for heat sealing.

When the control unit 16 receives a stop signal from the bag making and packaging machine 10 at time S1, it continues the cycle operation that is being executed without stopping. The cycle operation being executed ends at time t1. At this time, the pair of heat seal parts 31 and 32 are in the first position P1. When receiving a stop signal from the bag making and packaging machine 10, the control unit 16 causes the transport unit 33 to stop transporting the film F at time t1 when the cycle operation being executed ends. Thereafter, the control unit 16 uses the air cylinder to move the pair of heat seal parts 31, 32 from the first position P1 to the second position P2, and seals the side edges R1, R2 with the pair of heat seal parts 31, 32. Insert. The side edges R1 and R2 before being sandwiched are not heat sealed. Next, the control section 16 heat-seals the side edges R1, R2 by maintaining the state in which the side edges R1, R2 are sandwiched between the pair of heat sealing sections 31, 32 for a predetermined period of time. Thereafter, the control unit 16 uses the air cylinder to release the sandwiching of the side edges R1 and R2 between the pair of heat seal parts 31 and 32, and moves the pair of heat seal parts 31 and 32 from the second position P2 to the first position P1. move it to The period t2 to t3 in FIG. 9 is a period during which the pair of heat seal parts 31 and 32 sandwich the side edge parts R1 and R2. After that, the control unit 16 stops the bag making and packaging machine 10. Therefore, when the bag making and packaging machine 10 is stopped, the distance between the second heat sealing part 32 and the side edge R2 is maintained at a predetermined length or more. At this time, side edges R1 and R2 between the pair of heat-sealed parts 31 and 32 are heat-sealed.

In FIG. 9, after the bag making and packaging machine 10 is stopped, the control unit 16 restarts the operation of the bag making and packaging machine 10 at time S2. In this case, the control section 16 starts transporting the film F and at the same time moves the pair of heat seal sections 31 and 32 in the vertical direction using the drive motor to start a cycle operation. At this time, the side edges R1 and R2 between the pair of heat-sealed parts 31 and 32 have already been heat-sealed. Therefore, as shown in FIG. 9, in the first cycle operation after restarting the operation of the bag making and packaging machine 10, the control unit 16 uses the air cylinder to seal the side edges R1 and R2 with the pair of heat seal parts 31 and 32. Do not pinch and heat seal.

(4) Features The bag making and packaging machine 10 vertically heat seals the side edges R1 and R2 on both sides of the film F formed into a cylindrical shape by the pair of heat sealing parts 31 and 32 of the bag making and packaging unit 12. Thus, a cylindrical film Fc is formed. During operation of the bag making and packaging machine 10, the control section 16 performs a cyclic operation of the pair of heat seal sections 31 and 32 as shown in FIGS. 7 and 8 while transporting the film F downward. When the control unit 16 receives a signal to stop the operation of the bag making and packaging machine 10 during the cycle operation, the control unit 16 completes the vertical sealing of the portion to be vertically sealed in the next cycle operation being executed, and closes the pair of heat seal units 31, After releasing the sandwiching of the side edges R1 and R2 by the bag making and packaging machine 10, the bag making and packaging machine 10 is stopped. That is, after the cycle operation is stopped, the control unit 16 performs the vertical sealing operation at the upper first position P1 and the second position P2 without transporting the film F.

A problem when the control unit 16 does not vertically seal a portion to be vertically sealed in the next cycle operation being executed will be described. Consider a state in which when the control unit 16 stops the operation of the bag making and packaging machine 10, the side edge portions R1 and R2 before being heat sealed are located between the pair of heat seal portions 31 and 32. FIG. 10(a) shows the state immediately after the bag making and packaging machine 10 stops operating in this case. In the state shown in FIG. 10(a), if the distance between the second heat-sealed part 32 and the side edge R2 is not sufficiently secured, the side edges R1 and R2 before being heat-sealed are There is a risk of deformation due to the heat of the second heat-sealed portion 32. For example, as shown in FIG. 10(b), the side edge portions R1 and R2 may be bent by receiving radiant heat from the second heat seal portion 32. In this case, when the operation of the bag making and packaging machine 10 is restarted and the pair of heat seal parts 31 and 32 sandwich and heat seal the curved side edges R1 and R2, a sealing failure may occur.

When the bag making and packaging machine 10 of this embodiment receives an operation stop signal of the bag making and packaging machine 10, after vertically sealing the portion to be vertically sealed in the next cycle operation being executed, the bag making and packaging machine 10 10 is stopped, it is possible to suppress the occurrence of the above-mentioned seal failure. Therefore, the bag making and packaging machine 10 can suppress the occurrence of vertical seal defects.

(5) Modification Examples Modifications of the above embodiment are shown below. Note that part or all of the contents of each modification may be combined with the contents of other modifications to the extent that they do not contradict each other.

(5-1) Modification A
In the embodiment, when the control unit 16 receives a signal to stop the operation of the bag making and packaging machine 10 during a cycle operation, the control unit 16 completes the vertical sealing of the portion to be vertically sealed in the next cycle operation being executed, and After releasing the pinching of the side edges R1 and R2 by the seal parts 31 and 32, the bag making and packaging machine 10 is stopped.

In this modification, when the control unit 16 receives a signal to stop the operation of the bag making and packaging machine 10 during the cycle operation, the control unit 16 completes the vertical sealing in the cycle operation in progress, and causes the pair of heat seal units 31 and 32 to After the pinching of the side edges R1 and R2 is released, the bag making and packaging machine 10 is stopped. Specifically, when the control unit 16 receives a stop signal of the bag making and packaging machine 10 during execution of a cycle operation, in the cycle operation being executed, the side edge portion R1, After releasing the pinching of R2 and before moving the pair of heat seal parts 31 and 32 to the first position P1, the bag making and packaging machine 10 is stopped.

In this modification, if the control unit 16 receives a stop signal from the bag making and packaging machine 10 before the states shown in FIGS. 7(c) and 8(c) in the cycle operation being executed, In the cycle operation, the bag making and packaging machine 10 is stopped in the states shown in FIGS. 7(d) and 8(d). FIGS. 7(c) and 8(c) show the state when the pair of heat sealing parts 31 and 32 are in the third position P3 and the vertical sealing is completed. 7(d) and FIG. 8(d), the pair of heat-sealed parts 31, 32 are in the fourth position P4, and after the vertical sealing is completed, the side edges R1, R2 are sealed by the pair of heat-sealed parts 31, 32. This is the state in which the pinching is released.

FIG. 11 is a time chart similar to FIG. 9, and is a time chart of the operation of the vertical sealing mechanism 22 in this modification. FIG. 11 is a time chart when the control unit 16 receives a stop signal for the bag making and packaging machine 10 before the states shown in FIGS. 7(c) and 8(c). FIG. 11 shows a time S0 when the control unit 16 starts operation of the bag making and packaging machine 10, a time S1 when the control unit 16 receives a stop signal for the bag making and packaging machine 10, and a time after the bag making and packaging machine 10 is stopped. Time S2 at which the control unit 16 restarts the operation of the bag making and packaging machine 10 is shown. Unlike the embodiment, the control unit 16 heat-seals the side edges R1 and R2 by sandwiching the side edges R1 and R2 between the pair of heat-sealing parts 31 and 32 using an air cylinder in the first cycle operation, as shown in FIG. 11(b). do.

In FIG. 11, the control unit 16 controls the control unit 16 while the pair of heat seal parts 31 and 32 are moving downward with the side edges R1 and R2 sandwiched between them, that is, the pair of heat seal parts 31 and 32 are While moving from the second position P2 to the third position P3, a stop signal for the bag making and packaging machine 10 is received at time S1. In this case, the control unit 16 controls the control unit 16 at time t11 when the downward movement of the pair of heat seal parts 31 and 32 is completed and the pinching of the side edges R1 and R2 by the pair of heat seal parts 31 and 32 is released. , the bag making and packaging machine 10 is stopped. At time t11, the pair of heat seal parts 31 and 32 are at the fourth position P4.

In FIG. 11, at time S2 when the operation of the bag making and packaging machine 10 is restarted, the control unit 16 starts an operation of moving the pair of heat seal parts 31 and 32 from the fourth position P4 to the first position P1, At the same time, the transport section 33 starts transporting the film F. After the pair of heat seal parts 31 and 32 move to the first position P1, the control part 16 starts the normal cycle operation by the vertical seal mechanism 22.

In this modification, when the control unit 16 receives a stop signal of the bag making and packaging machine 10 after the states shown in FIGS. 7(c) and 8(c) in the cycle operation being executed, the control unit 16 The packaging machine 10 may be stopped immediately.

In this modification, as in the embodiment, the control unit 16 stops the bag making and packaging machine 10 after completing the vertical sealing and releasing the pinching of the side edges R1 and R2 between the pair of heat seal parts 31 and 32. can be done. Therefore, the bag making and packaging machine 10 can suppress the occurrence of vertical seal defects.

(5-2) Modification B
In modification A, the first position P1 of the pair of heat-sealed parts 31 and 32, which is the starting point of the cycle operation, is located at the first position P1 of the pair of heat-sealed parts 31 and 32 that sandwich the side edges R1 and R2 of the film F in the cycle operation. , 32 along the longitudinal direction LD. In this case, the first position P1 is the lowest position in the vertical movable range of the pair of heat seal parts 31 and 32. Specifically, the first position P1 of this modification corresponds to the fourth position P4 of the embodiment. FIG. 12 is a front view showing the cyclic operation of the pair of heat seal parts 31 and 32 in this modification.

A normal cycle operation in this modification will be explained. First, as shown in FIG. 12(a), the control unit 16 moves the pair of heat-sealed parts 31 and 32 in the first position P1, which does not sandwich the side edges R1 and R2 of the film F, in the longitudinal direction LD. move it upwards along. Thereby, as shown in FIG. 12(b), the pair of heat seal parts 31 and 32 move to the uppermost position in the movable range of the pair of heat seal parts 31 and 32 in the vertical direction. Next, as shown in FIG. 12(c), the control unit 16 moves the pair of heat seal parts 31 and 32 to a second position P2 where the side edges R1 and R2 of the film F are sandwiched. Next, as shown in FIG. 12(d), the control unit 16 transports the film F by the transport unit 33 while sandwiching and heat-sealing the side edges R1 and R2 between the pair of heat-sealing parts 31 and 32. The pair of heat seal parts 31 and 32 are moved from the second position P2 to the third position P3 in conjunction with the above. Thereafter, as shown in FIG. 12A, the control unit 16 releases the sandwiching of the heat-sealed side edges R1 and R2 between the pair of heat-sealed parts 31 and 32, and , 32 from the third position P3 to the first position P1.

In this modification, when the control unit 16 receives a stop signal of the bag making and packaging machine 10 during execution of a cycle operation, in the execution cycle operation, the side edge R1 by the pair of heat seal parts 31 and 32, After releasing the pinching of R2 and moving the pair of heat seal parts 31 and 32 to a position other than the first position P1, the bag making and packaging machine 10 can be stopped. In this case, when the bag making and packaging machine 10 is stopped, it is necessary to ensure a sufficient distance between the second heat seal section 32 and the side edge R2.

(5-3) Modification C
In the embodiment, when restarting the bag making and packaging machine 10 after the bag making and packaging machine 10 is stopped, the control unit 16 starts transporting the film F and at the same time causes the drive motor to start the pair of heat sealing parts 31 and 32. Start the cycle operation by moving up and down. At this time, as shown in FIG. 9, the control unit 16 moves the pair of heat seal parts 31 and 32 from the first position P1 to the second position P2 using the air cylinder to sandwich the side edges R1 and R2. I do.

However, the control unit 16 moves the film F downward by a predetermined distance along the longitudinal direction LD before moving the pair of heat seal parts 31 and 32 from the first position P1 to the second position P2 using the air cylinder. It may be transported. The predetermined distance is, for example, the distance that the film F is transported by the transport section 33 in one cycle operation. In this case, in the first cycle operation after restarting the operation of the bag making and packaging machine 10, the control unit 16 uses an air cylinder to sandwich the side edges R1 and R2 between the pair of heat seal parts 31 and 32, and Parts R1 and R2 are heat sealed.

(5-4) Modification D
In the embodiment and modifications A to C, the bag making and packaging unit 12 forms the bag B while continuously conveying the film F supplied from the film supply unit 13. However, the bag making and packaging unit 12 may form the bag B while intermittently conveying the film F supplied from the film supply unit 13. In this case, the bag making and packaging unit 12 forms the bag B while temporarily stopping conveyance of the film F at a predetermined timing.

In the continuous mode in which the film F is continuously transported, the bag making and packaging unit 12 seals the film F that is being transported. On the other hand, in the intermittent mode in which the film F is transported intermittently, the bag making and packaging unit 12 seals the stopped film F at the timing when the transport of the film F is stopped. The control section of the bag making and packaging machine 10 controls the bag making and packaging unit 12 according to the operation mode. In the intermittent mode, the vertical sealing mechanism 22 vertically seals the stopped film F, for example, at a timing when the conveyance of the cylindrical film F is temporarily stopped. In this case, the control unit 16 does not move the vertical seal mechanism 22 in the vertical direction. Similarly to the embodiment, when receiving a signal to stop the operation of the bag making and packaging machine 10, the control section 16 causes the vertical sealing mechanism 22 to complete the vertical sealing of the film F, and the pair of heat sealing sections 31 and 32 to complete the vertical sealing of the film F. After releasing the sandwiching of the side edges R1 and R2, the operation of the bag making and packaging machine 10 is stopped. Thereby, the bag making and packaging machine 10 can suppress the occurrence of problems with vertical seals, similarly to the embodiment.

Moreover, the bag making and packaging machine 10 may be configured to be able to switch the operation mode between continuous mode and intermittent mode. By being able to switch between the continuous mode and the intermittent mode, the operator of the bag making and packaging machine 10 can select an appropriate operation mode depending on the situation. In this case, upon receiving the operation stop signal of the bag making and packaging machine 10, the control unit 16 causes the vertical sealing mechanism 22 to complete the vertical sealing of the film F according to the operation mode of the bag making and packaging machine 10, and After releasing the sandwiching of the side edges R1 and R2 of the film F by the seal parts 31 and 32, the operation of the bag making and packaging machine 10 is stopped.

(5-5) Modification E
In the embodiment and modifications A to D, as shown in FIGS. 7 and 8, during the cycle operation of the vertical sealing mechanism 22, the first heat sealing part 31 reciprocates within a predetermined range along the vertical direction. However, the second heat-sealing section 32 repeats the box motion by moving within a predetermined range along the left-right direction and the up-down direction. However, during execution of the cyclic operation of the vertical sealing mechanism 22, both the first heat sealing section 31 and the second heat sealing section 32 may repeat the box motion. In this case, the movements of the first heat-sealed portion 31 and the second heat-sealed portion 32 are symmetrical with respect to the side edges R1 and R2.

(5-6) Modification example F
In the embodiment, when the control unit 16 receives a signal to stop the operation of the bag making and packaging machine 10, the control unit 16 starts the bag making and packaging machine 10 after vertically sealing the portion to be vertically sealed in the next cycle operation being executed. By stopping it, it is possible to suppress the occurrence of seal defects. However, the control unit 16 may suppress the occurrence of seal failure using other methods. For example, when receiving a signal to stop the operation of the bag-making and packaging machine 10, the control unit 16 temporarily retracts the pair of heat-sealing parts 31 and 32 from the film F, and then stops the operation of the bag-making and packaging machine 10. You may let them. Thereby, the operation of the bag making and packaging machine 10 can be stopped in a state where the side edge parts R1 and R2 of the film F are not located between the first heat sealing part 31 and the second heat sealing part 32. Therefore, the side edge portions R1 and R2 before being heat-sealed are suppressed from being deformed by the heat of the second heat-sealed portion 32, and the occurrence of sealing defects is suppressed.

Two specific examples of methods for temporarily retracting the pair of heat seal parts 31 and 32 will be described. In the first example, when the control unit 16 receives the operation stop signal of the bag making and packaging machine 10, the control unit 16 moves the pair of heat seal parts 31, 32 forward and closes the pair of heat seal parts 31, 32 to the side. After ensuring a sufficient distance between the edges R1 and R2 in the front-rear direction, the operation of the bag making and packaging machine 10 is stopped. This suppresses deformation of the side edge portions R1 and R2 before being heat sealed.

In the second example, when the control unit 16 receives a signal to stop the operation of the bag making and packaging machine 10, the control unit 16 controls a pair of heat waves around a predetermined axis along the vertical direction located in front of the side edges R1 and R2. After the seal parts 31 and 32 are rotated to ensure a sufficient distance between the pair of heat seal parts 31 and 32 and the side edges R1 and R2, the operation of the bag making and packaging machine 10 is stopped. This suppresses deformation of the side edge portions R1 and R2 before being heat sealed. Further, by rotating the pair of heat seal parts 31 and 32, the first heat seal part 31 and the second heat seal part 32 can be separated from each other when the bag making and packaging machine 10 is stopped. The heat seal parts 31 and 32 can be easily cleaned.

10 Bag making and packaging machine 16 Control section 22 Vertical sealing mechanism 31 First heat sealing section (heat sealing section)
32 Second heat seal part (heat seal part)
33 Conveyance section P1 1st position P2 2nd position F Film R1 Side edges (side edges on both sides of the film)
R2 Side edges (side edges on both sides of the film)
LD Longitudinal direction (longitudinal direction of film)

Japanese Patent Application Publication No. 2010-6387

Claims (3)

A bag making and packaging machine equipped with a vertical sealing mechanism that seals both side edges of the film to form the film into a cylindrical shape,
comprising a control unit that controls the bag making and packaging machine,
The vertical seal mechanism is
a pair of heat-sealing parts that sandwich and heat-seal the side edges of both sides with their palms together;
a conveyance unit that conveys the film along its longitudinal direction;
has
The control section, during operation of the bag making and packaging machine,
moving the heat-sealing part from a first position where it does not sandwich the side edge to a second position where it pinches the side edge;
Thereafter, the heat sealing part sandwiching the side edge part is moved along the longitudinal direction so as to be interlocked with the transport of the film by the transporting part,
After that, the pinching of the side edge part by the heat seal part is released,
After that, repeating a cycle operation of moving the heat sealing part to the first position,
When the control unit receives a stop signal of the bag making and packaging machine during execution of the cycle operation, the controller terminates the cycle operation in progress and then closes the side edge to be heat sealed in the next cycle operation. sandwiching the side edge portion with the heat sealing portion, and then stopping the bag making and packaging machine after releasing the side edge portion from being pinched by the heat sealing portion.
Bag making and packaging machine. The first position is the position of the heat seal part in the longitudinal direction before moving the heat seal part sandwiching the side edge part along the longitudinal direction in the cycle operation,
The bag making and packaging machine according to claim 1. When the control unit restarts the operation of the bag making and packaging machine after receiving the stop signal, the heat sealing unit is conveyed in one cycle operation before moving the heat sealing unit to the second position. transporting the film along the longitudinal direction by a distance;
The bag making and packaging machine according to claim 1.

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