WO2009107307A1

WO2009107307A1 - Pusher in packing device

Info

Publication number: WO2009107307A1
Application number: PCT/JP2008/073037
Authority: WO
Inventors: 譲二柴垣
Original assignee: ユニ・チャーム株式会社
Priority date: 2008-02-28
Filing date: 2008-12-18
Publication date: 2009-09-03
Also published as: BRPI0820754A2; CN102015454B; US20110036055A1; AU2008351711A1; MX2010009455A; EG25636A; TWI478847B; KR20100125360A; EP2258617A1; TW201002577A; CN102015454A

Abstract

A pusher of a packing device which can prevent deformation of an article to be packed. An air supply opening (53) is formed on the front surface (46) at the head portion (36) of a pusher (1) used in a packing device, and an air suction opening (52) is formed on the side (43). The air supply opening (53) can bring the inside and the outside of a bag (2b) into a state where air is ventilated when the front end of the pusher (1) is located on the inside of the bag (2b). The air suction opening (52) acts to form a gore (57) at the opening end by sucking air of the bag (2b) when the front end of the pusher (1) moves inside the bag (2b) in the retracting direction.

Description

Pusher in packaging equipment

The present invention relates to a pusher used in a packaging apparatus for obtaining a packaged product by inserting a packaged body from an opening end of a bag.

A device that uses a pusher to push a package body into a bag having one end portion closed and an opposite end portion open, and then closes the open end to obtain a package. Is well known in the art. For example, in the high-speed packaging machine described in Japanese Utility Model Publication No. 61-160002 (Patent Document 1), heat sealing is performed by using a plurality of horizontal sealers and cutting devices for a cylindrical plastic film. A bag having a closed end and an open end opposite the closed end. A pusher is used to insert a predetermined number of packages into the bag, and then the open end is heat-sealed to obtain a package. Further, in such a packaging machine, air suction ports are formed on both sides of the pusher, and when the pusher that has entered the bag while pressing the package is withdrawn from the bag, It is also known as a prior art that air is sucked to form a town at the opening end of the bag and the opening end is heat-sealed to be in a closed state.
Japanese Utility Model Publication No. 61-160002

In such a conventional technique, when the pusher leaves the bag, the inside of the bag tends to be in a reduced pressure state. On the other hand, if the packaged body is a flexible material such as a disposable diaper or a sanitary napkin, and the bag is also formed of a flexible sheet material such as a plastic film or paper, the pressure is reduced. The package body may be deformed as the bag is deformed. As a result, the packaged body may have a reduced function during use or a poor appearance. In addition, the package may be difficult to stack in an orderly manner at a store or the like due to the irregular shape.

In such a conventional technique, it is preferable that the front surface of the pusher has a large area so that the object to be packed can be pushed in a wide area as much as possible. If a uniform pressing force is applied to a large area of the packaged body by doing so, the use of the pusher reduces the damage to the packaged body. However, as the area of the front surface of the pusher increases, the inner surface of the bag becomes more closely attached to the pusher, and it is difficult for the bag to deform so as to follow the groove of the pusher even if the air inside the bag is sucked. Become. In such a state, it becomes difficult to quickly make a well-shaped town in the bag.

Therefore, the present invention has an object to improve the pusher used in the packaging apparatus so that such problems in the packaged body and the package can be solved.

This invention for solving the above-mentioned problems includes the first invention and the second invention. The first invention is directed to a bag having a closed end portion and an open end portion which is an opposite end portion thereof, after a package body is pushed into the bag from the open end portion, and then, on both sides of the open end portion. The pusher is used to push in the package body used in a packaging apparatus that obtains a package body from the bag and the package body by closing the opening end portion while forming the package.

In such a pusher, the features of the first invention are as follows. The pusher reciprocates in the direction in which the packaged body is pushed in and in the opposite direction, and is a front end portion that enters the bag while being pressed against the packaged body, and an opposite end portion thereof. A head portion having a rear end portion and both side portions extending in parallel with each other in a direction in which the package body is pushed in between the front end portion and the rear end portion; The front end portion has an air supply port that allows the inner side and the outer side of the bag to be ventilated via the pusher when the front end portion is inside the bag. The both sides have air suction ports that allow the town to be formed at the open end of the bag when the front end inside the bag moves in the opposite direction.

In one embodiment of the first invention, the air supply port at the front end portion of the head portion is between the front end portion and the rear end portion, and is behind the rear end portion and the rear end portion. Either is open to the atmosphere.

In another embodiment of the first invention, pressurized air can be supplied into the bag from the air supply port at the front end of the head portion.

In another one of the embodiments of the first invention, each of the both side portions of the head portion has a V-shaped groove extending from the front end portion toward the rear end portion, and at the bottom of the V-shaped groove. Is formed with the air suction port.

The second invention in this invention is directed to a bag having a closed end portion and an open end portion which is the opposite end portion thereof, after the package body is pushed into the bag from the open end portion, The pusher is used to push in the packaged body used in a packaging device that obtains a packaged body from the bag and the packaged body by closing the open end while forming towns on both sides.

In such a pusher, the features of the second invention are as follows. The pusher reciprocates between a forward movement in a direction of pushing in the packaged body and a backward movement in the opposite direction, and the bag is pressed against the packaged body while being pressed against the packaged body. And a head portion having a width direction orthogonal to the reciprocating direction and a thickness direction orthogonal to the reciprocating direction and the width direction. The head portion is either divided into a first plate and a second plate that overlap in the thickness direction, or divided into a first plate and a second plate and a third plate sandwiching the first plate. In this state, a groove having a V-shaped cross section is formed on both sides of the first plate in the width direction so as to extend in the reciprocating direction and is used to form the town. Has an opening connected to a vacuum suction source. In the forward movement of the pusher, the second plate and the third plate push the packaged body together with the first plate and enter the bag, and in the backward movement of the pusher, The second plate and the third plate are retracted from the bag when the first plate is in a stationary state after being pushed in, and then the first plate is sucked into the bag by the vacuum suction. The head portion is formed so that it can be retracted while applying a vacuum pressure from a source. The front portion of one of the first, second, and third plates allows the inside and outside of the bag to be in a vented state through the first plate when the front portion is inside the bag. An air supply port.

In one embodiment of the second invention, the second plate and the third plate are integrated behind the head portion.

In another embodiment of the second invention, pressurized air can be supplied into the bag from the air supply port.

The pusher according to the first aspect of the present invention has an air supply port at the front end portion of the head portion and an air suction port at both side portions. When exiting from the bag, even if the air inside the opening end is sucked from the air suction port so as to form a town at the opening end of the bag, the central portion of the bag into which the package body is pressed is unlikely to be in a reduced pressure state. Deformation of the packaged body due to forming the town can be prevented.

A pusher according to a second aspect of the present invention includes a first plate and a second plate, or a first plate and a second plate and a third plate sandwiching the first plate, the head portions of which overlap each other, and a packaged body. When the press-in of is finished, the second plate or the second plate and the third plate are withdrawn from the bag and then only the first plate is used to form a town in the bag. Therefore, even when the bag is in close contact with the head portion when the packaged body is pushed in, the bag for forming the town in the first plate is not in close contact with the head portion. Even if the bag is deep, the bag can easily enter the groove and deform so as to follow the shape of the groove, so that a well-shaped town can be obtained quickly.

The perspective view of a bag and a to-be-packaged body. The side view of the packaging apparatus which uses a pusher. The figure which shows the detail of a bagging process by (a)-(e). FIG. 4 is a view taken along line IV-IV in FIG. 3. The figure which shows an example of the usage condition of a pusher. The perspective view of a bag and a to-be-packaged body. The side view of the packaging apparatus which uses a pusher. The perspective view of a pusher. The figure which shows the IX-IX line | wire cut surface of FIG. The figure which shows the detail of a bagging process by (a)-(f). The figure which shows an example of the usage condition of a pusher. The same figure as FIG. 9 which shows an example of a head part. The perspective view of the package obtained using the head part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1

Pusher

2, 2a, 2b Bag 4 Closed end part 5 Open end part 10 Packaging apparatus 14

Packaging body

15, 15a Package body 36 Head part 41 Front end part 42 Rear end part 43 Side part 51 V-shaped groove 52 Air suction port 53 Air supply port 57 Town 101 Pusher 110 Packaging device 136 Head portion 141 Front portion 151 First plate (main plate)
152 Second plate (upper sub-plate)
153 3rd plate (lower sub-plate)
156 Groove 157 Opening (suction port)
158 Air supply port A Reciprocating direction (machine direction)
B width direction (cross direction)
T Height direction

Referring to the attached drawings, the details of the pusher in the present invention used in the packaging apparatus will be described as follows.

FIG. 1 shows a bag 2 to be used by the pusher 1 (see FIGS. 2 and 3) in the present invention, and a package to be packaged in the bag 2, that is, a plurality of sanitary napkin individual packages 3 formed. It is a figure which shows the aggregate | assembly 15. The bag 2 is formed of, for example, a flexible and non-breathable plastic film, and includes a closed end 4 on which a heat seal 2d is formed, and an open end 5 that is the opposite end of the closed end 4. Have Between the closed end portion 4 and the open end portion 5, there is a pair of side surface portions 7 in which a town 6 is formed. The individual wrapping body 3 is obtained by enclosing sanitary napkins (not shown) in individual bags 3a formed of a flexible sheet material such as a plastic film or a nonwoven fabric. The assembly 15 is formed in an orderly arrangement in the machine direction A (see also FIG. 2) and the intersecting direction B perpendicular thereto.

FIG. 2 is a side view of the packaging device 10 in which the pusher 1 according to the present invention is used. The packaging device 10 includes a first supply step 11 for intermittently supplying the bag 2, a second supply step 12 for intermittently supplying the assembly 15 formed by the individual package 3, the bag 2, And a bagging step 13 for obtaining a package 14 (see also FIG. 3) comprising the assembly 15.

In the first supply step 11 of FIG. 2, the bag 2 in which the town 6 is formed is intermittently supplied from the left side of the drawing with the opening end 5 facing forward. In the bag 2, the upper and lower surfaces 8, 9 (see FIG. 1) of the bag 2 are sucked by the pair of upper and lower expansion suction plates 16, and the opening end 5 is in the expanded state as shown in FIG. 1. The suction plate 16 is moved horizontally in the direction of the arrow C to cover the opening end portion 5 that is widened on the bucket 21a of the plurality of buckets 21, and then returns to the illustrated position away from the opening end portion 5. . The bucket 21 maintains the open end portion 5 in an expanded state. In the figure, the bag 2 covered by the bucket 21a of the bucket 21 is shown as a virtual line bag 2a. The bucket 21 is also attached to a disk 22 that rotates intermittently clockwise or counterclockwise, and the bag 2a placed on the bucket 21a rotates 180 ° together with the disk 22 so that the upper side of the figure. Move down. In FIG. 2, the bag 2a thus moved is shown as a virtual line bag 2b, and the bucket 21a is shown as a bucket 21b.

2, in the second supply process 12, the assembly 15 is placed on the transporter 17, moved in the direction of arrow D, and transferred to the lifter 18 included in the transporter 17. The lifter 18 moves up and down, and the assembly 15 placed thereon can be moved upward as indicated by an arrow E. In the figure, the aggregate 15 thus moved is shown as an aggregate 15a. In the transporter 17, a plurality of pins 17b are attached to the endless belt 17a that intermittently moves in the direction of the arrow D at regular intervals, and are slidably mounted on a support base (not shown) in the transporter 17. The assembly 15 is pressed by the pin 17b from the right side of the drawing, that is, from the direction of the arrow D, and the assembly 15 is moved in the direction of the arrow D.

2 includes a pusher 1, a pair of upper and lower press plates 31, a pair of upper and lower seal plates 32, and an endless belt 33. The pusher 1 has a head portion 36 on the left side in the machine direction A, and a rod portion 37 on the right side. The rod portion 37 drives the pusher 1 to reciprocate forward and backward in the machine direction A. The pusher 1 is connected to a mechanism (not shown) and is in a retracted position. In the bag filling step 13, the bag 2b, the bucket 21b covered with the bag 2b, the assembly 15a moved upward, and the pusher 1 are aligned in the machine direction A. The pusher 1 moves forward to the left in the machine direction A, the head portion 36 presses against the assembly 15a, and pushes the assembly 15a into the bucket 21b. The head portion 36 further advances, and the aggregate 15a is pushed into the bag 2b, and then the bag 2b is pushed leftward through the aggregate 15a to be removed from the bucket 21b and placed on the endless belt 33. Thereafter, the head portion 36 retracts toward the right in the machine direction A so as to exit from the bag 2b. At this time, the pair of presser plates 31 move so as to approach each other in the vertical direction, thereby preventing the bag 2b from moving to the right. When the head portion 36 is withdrawn from the bag 2b, the pair of heated seal plates 32 approach in the vertical direction to form the heat seal 2e (see FIG. 3) sandwiching the opening end portion 5 of the bag 2b. Thereafter, when the pair of seal plates 32 returns to the state shown in the drawing, the package 14 including the aggregate 15 is obtained. The package 14 is carried to the left by the endless belt 33.

FIG. 3 is a diagram showing details of the bag filling process 13, but the lifter 18 and the disk 22 are not shown. In FIG. 3A, the bucket 21b covered with the bag 2b, the aggregate 15a, and the pusher 1 are aligned in the machine direction A. The head portion 36 of the pusher 1 has a front end portion 41 and a rear end portion 42 opposite to the front end portion 41. A pair of side surface portions 43 and a pair of upper and lower surface portions are provided between the front end portion 41 and the rear end portion 42. 44 and 45 are formed. Further, the front end portion 41 is formed with a front surface 46 (see FIG. 4) to be brought into contact with the assembly 15a, and the rear end portion 42 is formed with a rear surface 47 to which the rod portion 37 can be connected. A V-shaped groove 51 extending from the front end portion 41 toward the rear end portion 42 is formed in the side surface portion 43, and an air suction port 52 is formed at the bottom of the V-shaped groove 51. The air suction port 52 is connected to an air suction source (not shown) such as a vacuum pump, and can suck the air in the bag 2b at a predetermined time in the bag filling process 13. Further, an air supply port 53 (see FIG. 4) is formed in the front surface 46. The air supply port 53 is in a state opened to the atmosphere via a pipe (not shown) extending inside the head portion 36 or connected to a pressurized air supply source (not shown) such as a compressor. It is in. When opened to the atmosphere, the pipe has an open end between the front end portion 41 and the rear end portion 42 of the head portion 36, or at a rear end portion 42 or a portion behind the rear end portion 42.

3 (b), the head portion 36 moves forward to push the assembly 15a into the inside of the tunnel-like bucket 21b, and then pushes it into the bag 2b. The bag 2b is detached from the bucket 21b.

3 (c), the head portion 36 in FIG. 3 (b) begins to retract so as to retract from the bag 2b, while the pair of presser plates 31 begin to approach. Further, in the head portion 36, suction at the air suction port 52 starts, and the side surface portion 7 of the bag 2 b is deformed so as to follow the shape of the V-shaped groove 51 in the vicinity of the opening end portion 5. (See (e)) is starting to be formed. When the front end 41 is inside the bag 2b, the head portion 36 is in a state where the air supply port 53 is always open to the atmosphere or when the head portion 36 moves backward, Since the inside and the outside of the bag 2b can be ventilated while being supplied to the inside, it is possible to prevent the central portion of the bag 2b from being in a reduced pressure state due to the backward movement of the head portion 36 or the vacuum suction action. be able to. The assembly 15 is pushed into the central portion. When the sanitary napkin included in the individual package 3 has an elastic compression recovery force, the assembly 15 is in a compressed state when the pusher 1 is advanced and pressed, and the volume becomes small. When the pusher 1 is retracted, the compressed state is released and the volume increases, and the bag 2b may be in a reduced pressure state. However, the pusher 1 has the air supply port 53, so that the reduced pressure state is obtained. Can be prevented.

In FIG. 3D, a pair of heated seal plates 32 approach each other with respect to the bag 2b after the head portion 36 has retracted, and the heat seal 2e (see FIG. 3E) ) Is formed.

3 (e) shows the package 14 obtained in the bagging process 13. FIG. A heat seal 2e is formed on the package 14 in addition to the heat seal 2d.

Towns

56 and 57 are formed in the vicinity of the heat seals 2d and 2e on the side surface portion 7 of the bag 2 in the package 14.

FIG. 4 is a view taken along the line IV-IV in the head portion 36 shown in FIG. FIG. 4 shows a part of the front face 46 and the V-shaped groove 51 of the side face 43 in the head portion 36 of the pusher 1. An air supply port 53 is formed on the front face 46. The V-shaped groove 51 has a horizontal V-shape and has an air suction port 52 at the bottom. The bag 2b indicated by the phantom line along the V-shaped groove 51 is deformed by the vacuum pressure acting through the air suction port 52 and is in a state of starting to form the town 57. However, in the pusher 1 according to the present invention, even when the vacuum suction action for forming the town 57 in the bag 2 starts, the central portion of the bag 2 is opened to the atmosphere via the air supply port 53 in the head portion 36. By being in the state of being supplied or being supplied with pressurized air, there is no pressure reduction state. Therefore, the individual wrapping body 3 forming the aggregate 15 is not squeezed by a bag in a decompressed state and the shape is not distorted. In addition, since the packaging body 14 itself is not distorted, it is easy to stack the packaging bodies 14 when packaging or displaying the plurality of packaging bodies 14. In the pusher 1, the start and end timings of air suction through the air suction port 52 and the start and end timings of pressurized air supply through the air supply port 53 are controlled according to these timings. This is made possible by installing a mechanism (not shown) in the packaging device 10. In the pusher 1, it is possible to replace the V-shaped groove 51 in the illustrated example with a U-shaped groove or other concave groove.

FIG. 5 is a view similar to (a) of FIG. 3 showing an example of a usage mode of the pusher 1 according to the present invention. In the bag 2b of FIG. 5, the open end 5 covers the bucket 21b, while the closed end 4 enters the bucket 21b from the left in the machine direction A. The closed end 4 is in a state where its inner surface is exposed and faces the aggregate 15a. When the assembly 15a is pushed by the pusher 1 and enters the bucket 21b, the assembly 15a contacts the inner surface of the closed end 4 of the bag 2b. As the pusher 1 moves forward, the assembly 15a enters the bag 2b, and eventually enters the state shown in FIG. In order to bring the bag 2b into the state shown in FIG. 5, the open end 5 is put on the bucket 21b, and then the compressed air is sprayed from the outside of the closed end 4 toward the bag 2b. What is necessary is just to enter 21b from the left side of a figure.

In the embodiment of FIG. 5, when the assembly 15 a is advanced into the bag 2 b using the pusher 1, air is not trapped in the bag 2 b in front of the assembly 15 a, and the compact packaging body 14 is formed. Obtainable.

The pusher 1 and the packaging device 10 including the pusher 1 illustrated so far are suitable for packaging flexible and easily deformable articles such as sanitary napkins and disposable diapers, but are used for articles that are difficult to deform. Needless to say, you can.

FIG. 6 shows a bag 2 to be used by a pusher 101 (see FIGS. 7 and 8) which is an example of the pusher according to the present invention, and a sanitary napkin individual package 3 which is a package to be packaged in the bag 2. It is a figure which shows the assembly 15 and the package 14 in the state which the assembly 15 was packaged and the bag 2 was closed. The bag 2 is formed of, for example, a flexible and non-breathable plastic film, and includes a closed end 4 on which a heat seal 2d is formed, and an open end 5 that is the opposite end of the closed end 4. Have Between the closed end portion 4 and the open end portion 5, there is a pair of side surface portions 7 in which a town 6 is formed. The individual wrapping body 3 is obtained by enclosing sanitary napkins (not shown) in individual bags 3a formed of a flexible sheet material such as a plastic film or a nonwoven fabric. The assembly 15 is formed in an orderly arrangement in the machine direction A (see also FIG. 7) and the intersecting direction B perpendicular thereto.

FIG. 7 is a side view of the packaging device 110 in which the pusher 101 according to the present invention is used. The packaging device 110 includes a first supply step 11 for intermittently supplying the bag 2, a second supply step 12 for intermittently supplying the aggregate 15 formed by the individual package 3, the bag 2, And a bagging process 13 for obtaining a package 14 (see also FIG. 6) comprising the assembly 15.

In the first supply step 11 of FIG. 7, the bag 2 in which the town 6 is formed is intermittently supplied from the left side of the drawing with the open end 5 facing forward. In the bag 2, the upper and lower surfaces 8 and 9 (see FIG. 6) of the bag 2 are sucked by the pair of upper and lower expanding suction plates 16, and the opening end 5 is in the expanded state as shown in FIG. 6. The suction plate 16 is moved horizontally in the direction of arrow C to cover the opening end 5 that is in the expanded state on the bucket 21a of the plurality of buckets 21, and then returns to the illustrated position away from the opening end 5. . The bucket 21 maintains the open end 5 in the expanded state, and in the figure, the bag 2 placed on the bucket 21a of the bucket 21 is shown as a virtual line bag 2a. The bucket 21 is also attached to a disk 22 that rotates intermittently clockwise or counterclockwise, and the bag 2a placed on the bucket 21a rotates 180 ° together with the disk 22 so that the upper side of the figure. Move down. In FIG. 7, the bag 2a thus moved is shown as a virtual line bag 2b, and the bucket 21a is shown as a bucket 21b.

7, in the second supply step 12, the assembly 15 is placed on the transporter 17 and moved in the direction of arrow D, and is transferred to the lifter 18 included in the transporter 17. The lifter 18 moves up and down, and the assembly 15 placed thereon can be moved upward as indicated by an arrow E. In the figure, the aggregate 15 thus moved is shown as an aggregate 15a. In the transporter 17, a plurality of pins 17b are attached to the endless belt 17a that intermittently moves in the direction of the arrow D at regular intervals, and are slidably mounted on a support base (not shown) in the transporter 17. The assembly 17 is pressed by the pins 17b from the right to the left in the drawing, that is, in the direction of the arrow D, and the assembly 15 is moved toward the lifter 18.

7 includes a pusher 101, a pair of upper and lower press plates 31, a pair of upper and lower seal plates 32, and an endless belt 33. The pusher 101 has a head portion 136 on the left side in the machine direction A, and a rod portion 137 on the right side. The rod portion 137 reciprocates the pusher 101 in the machine direction A between forward movement and backward movement. The pusher 101 is connected to a drive mechanism (not shown) for movement, and the pusher 101 shown in the figure is in a retracted position. In the bag filling process 13, the bag 2b, the bucket 21b covered with the bag 2b, the assembly 15a moved upward, and the pusher 101 are aligned in the machine direction A. The pusher 101 advances toward the left in the machine direction A, the head portion 136 presses against the assembly 15a, and pushes the assembly 15a into the bucket 21b. The head portion 136 further advances, pushes the aggregate 15a into the bag 2b, and then pushes the bag 2b to the left via the aggregate 15a to remove it from the bucket 21b and place it on the endless belt 33. Since a part of the head portion 136 that has been pushed into the assembly 15a has entered the bag 2b together with the assembly 15a, the head portion 136 is directed to the right in the machine direction A so as to exit the bag 2b. And retreat. At this time, the pair of presser plates 31 move so as to approach each other in the vertical direction, thereby preventing the bag 2b from moving to the right. When the head portion 136 is completely withdrawn from the bag 2b, the pair of heated seal plates 32 approach in the vertical direction to form the heat seal 2e (see FIG. 8) sandwiching the opening end 5 of the bag 2b. Thereafter, when the pair of seal plates 32 returns to the state shown in the drawing, the package 14 in a state where the bag 2b and the assembly 15a are in close contact with each other is obtained. The package 14 is carried to the left by the endless belt 33.

8 and 9 are a perspective view of the pusher 101 shown in the figure and a cross-sectional view taken along the line IX-IX in FIG. In FIG. 9, the bag 2b when the pusher 101 enters, the upper sub-plate 152, and the lower sub-plate 153 withdraw, and a town 61 (see FIG. 10) begins to be formed in the bag 2b. The bag 2b 'is shown in phantom lines. In FIG. 8, the head portion 136 of the pusher 101 has a horizontal reciprocating direction that coincides with the machine direction A, a width direction that coincides with the cross direction B perpendicular to the machine direction A, and these reciprocating directions. It has a height direction T orthogonal to the width direction. In the height direction T, the head portion 136 includes a main plate 151 that is a first plate, and an upper subplate 152 and a lower subplate 153 that are second and third plates sandwiching the main plate 151 in a sandwich shape. It is divided into three parts. The main plate 151, the upper sub-plate 152, and the lower sub-plate 153 can reciprocate independently in the machine direction A, and the rear end surface 151 b of the main plate 151 can be reciprocated. The main rod 137 is attached. A sub rod 138 for reciprocating motion is attached to the side plate 152b of the upper sub plate 152, and a sub rod 139 for reciprocating motion is attached to the side plate 153b of the lower sub plate 153. Yes. Each of the main rod 137 and the

sub rods

138 and 139 is connected to a drive source (not shown) such as a piston.

The main plate 151 and each of the sub-plates 152 and 153 have a main front surface portion 151 a and a

sub-front surface portions

152 a and 153 a that integrally form the front surface portion 141 of the pusher 101. The main front surface portion 151a and the sub

front surface portions

152a and 153a are portions that cooperate and press against the assembly 15 when the pusher 101 moves forward, and the pressure at that time is concentrated on the local portion of the assembly 15. Therefore, the shape of the front surface portion 141 of the pusher 101 formed integrally with the

front surface portions

151a, 152a, and 153a is substantially the same as the shape of the portion 19 of the assembly 15 facing the front surface portion 141. Some or slightly smaller than that. That is, the maximum dimension in the intersecting direction B and the height direction T of the front surface portion 141 is substantially the same as or slightly smaller than the maximum dimension in the intersecting direction B and the height direction T in the portion 19 of the assembly 15. It is getting smaller.

The pusher 101 also has side portions 42 that are formed symmetrically in the crossing direction B. The side surface portion 42 includes a main side surface portion 151c in the main plate 151 and sub

side surface portions

152c and 153c in the

sub plates

152 and 153. The main side surface portion 151c has a V-shaped cross section extending in the machine direction A from the front surface portion 151a. A groove 156 is formed, and a suction port 157 is formed in the groove 156. The suction port 157 is connected to an air suction source (not shown) such as a vacuum pump. The sub side surfaces 152c and 153c are formed smoothly. An air supply port 158 is formed in the main front surface portion 151a of the front surface portion 141 shown in FIG. The air supply port 158 is connected to an air intake port 159 formed in the main rear surface portion 151b of the main plate 151 and is in a state opened to the atmosphere.

FIG. 10 is a diagram showing details of the bag filling process 13, but the lifter 18 and the disk 22 are not shown. 10A, the bucket 21b covered with the bag 2b, the assembly 15a, and the pusher 101 are aligned in the machine direction A, and the portion 19 of the assembly 15a and the front portion of the pusher 101 are in the state. 141 is facing.

In FIG. 10 (b), the head portion 136 moves forward and presses almost the entire portion 19 of the assembly 15a to push the assembly 15a into the tunnel-like bucket 21b, and then pushes it into the bag 2b. The bag 2b is detached from the bucket 21b. When the assembly 15a is pushed into the bag 2b, a part of the head portion 136 enters the bag 2b.

In FIG. 10 (c), the main plate 151 is stationary, while the upper subplate 152 and the lower subplate 153 are moved back by the subrod 138 and the subrod 139, and the open end 5 of the bag 2b. Have left. When the upper sub-plate 152 and the lower sub-plate 153 begin to move backward, the pair of presser plates 31 are prevented from approaching the bag 2b and moving the bag 2b.

10 (d), the main plate 151 in FIG. 10 (c) begins to retract so as to retract from the bag 2b, while the pair of presser plates 31 further approach the bag 2b. Further, in the main plate 151, suction of the internal air of the bag 2 b at the suction port 157 starts, and the side surface portion 7 of the bag 2 b is deformed so as to follow the shape of the groove 156 in the vicinity of the opening end portion 5. (See (f) of FIG. 10) is starting to be formed. When the front portion 151a of the main plate 151 is inside the bag 2b, the main plate 151 can ventilate the inside and outside of the bag 2b with the air supply port 158 (see FIG. 9) open to the atmosphere. Therefore, the central portion of the bag 2b can be prevented from being depressurized by the retreating operation of the main plate 151 or the

sub plates

152, 153 or the suction action at the suction port 157 of the main plate 151. Thereby, it is possible to prevent the aggregate 15 pushed into the central portion from being deformed by the suction action. In addition, when the sanitary napkin included in the individual package 3 has an elastic compression recovery force, the assembly 15 is in a compressed state when the advanced pusher 101 is in pressure contact, and the volume becomes small. When the pusher 101 is retracted, the volume is increased from the compressed state, and the bag 2b may be in a reduced pressure state. However, the pusher 101 having the air supply port 158 prevents such a reduced pressure state. be able to.

In FIG. 10E, a pair of heated seal plates 32 approach each other to the bag 2b after the main plate 151 is retracted, and the heat seal 2e (see FIG. 10F). See). Although not shown, the positions of the retracted main plate 151, upper sub-plate 152, and lower plate 153 are automatically adjusted so that the

front portions

151a, 152a, 153a are in the state shown in FIG. Become.

(F) of FIG. 10 shows the package 14 obtained in the bagging process 13. A heat seal 2e is formed on the package 14 in addition to the heat seal 2d of FIG. The heat seal 2e is formed substantially at the center of the end surface portion 62 of the package 14 in the vertical direction of the figure.

Towns

6 and 61 are formed in the vicinity of the heat seals 2d and 2e on the side surface portion 7 of the bag 2 in the package 14.

In addition, the state when the town 61 is formed in the vicinity of the opening end 5 in FIG. 10 (d) is also shown in FIG. A suction port 157 is formed in the V-shaped groove 156 of the main plate 151 in the head portion 136, and the bag 2 b indicated by the phantom line is formed with a town 61 by the vacuum pressure acting through the suction port 157. The However, the town 61 is formed in FIG. 10 after the upper sub-plate 152 and the lower sub-plate 153 appearing in FIG. 10 are withdrawn from the bag 2b. In the groove 156 at that time, when the bag 2b is deformed so as to follow the groove 156 due to the vacuum pressure, the upper subplate 152 and the lower subplate 153 are in contact with each other until then and are in a tension state. This acts so that such a deformation of the bag 2b is facilitated. Therefore, in the pusher 101, even if the bag 2b is in close contact with the head portion 136 when the assembly 15 is pushed in, the town 61 can be easily obtained.

As described above, according to the head portion 136, an effect of facilitating the work of making the town 61 by deforming the bag 2 like a virtual line along the groove 156 without damaging the assembly 15a is obtained. It is done. Such a head portion 136 has an excellent effect when it is desired to make the opening angle α of the groove 156 in the main plate 151 particularly small and to make the depth in the cross direction B of the town 61 formed by the main plate 151 as deep as possible. Can be raised.

In the pusher 101 according to the present invention, even if the suction action for forming the town 61 in the bag 2 starts, the central portion of the bag 2 is opened to the atmosphere via the air supply port 158 in the head portion 136. Since it is in the state of being, it does not become a decompression state. Therefore, the individual wrapping body 3 forming the aggregate 15 is not squeezed by a bag in a decompressed state and is not distorted in shape. In addition, since the packaging body 14 itself is not distorted, it is easy to stack the packaging bodies 14 when packaging or displaying them. The air intake port 159 for the air supply port 158 functioning as described above is provided in the rear surface portion 151b of the main plate 151 as illustrated in FIG. 8, and is also provided between the main front surface portion 151a and the main rear surface portion 151b. It can also be provided behind the rear surface portion 151b. The air intake 159 may be connected to a pressurized air supply source such as a compressor and used to supply pressurized air to the bag 2b. In the pusher 101, the start and end timing of air suction through the suction port 157 and the start and end timing of pressurized air supply through the air supply port 158 are controlled by a control mechanism for these timings. This is possible by installing (not shown) in the packaging device 110. In the pusher 101, the groove 156 in the illustrated example can be replaced with a U-shaped groove or other concave groove.

In the pusher 101, the upper sub-plate 152 and the lower sub-plate 153 are also provided with an air supply port for the bag 2b to prevent the bag 2b from being in a decompressed state when the sub-plates 152 and 153 are retracted. it can. Such an air supply port is not necessarily provided in the main plate 151 as in the illustrated example, and the main plate 151 and the upper sub-port are taken into consideration in consideration of the size of the bag 2b and the assembly 15 and the head portion 136. It can be provided on either the plate 152 or the lower sub-plate 153.

In the present invention, the head portion 136 of the pusher 101 is preferably divided into three parts as shown in the figure and has three

plates

51, 152, 153 in the height direction T. However, the upper sub-plate 152 and the lower sub-plate 153 are integrated with each other at the rear of the head portion 136 in place of the separate sub-plates as shown in FIG. Can move forward and backward at the same time. Further, in the present invention, the head divided into two in the thickness direction using one main plate 151 and one subplate 152 or 153 without using one of the upper subplate 152 and the lower subplate 153. It is possible to replace the portion 136.

FIG. 11 is a view similar to (a) of FIG. 10 showing an example of usage of the pusher 101 according to the present invention. In the bag 2b of FIG. 11, the open end 5 covers the bucket 21b, while the closed end 4 enters the bucket 21b from the left in the machine direction A. The closed end 4 is in a state where its inner surface is exposed and faces the aggregate 15a. When the assembly 15a is pushed by the pusher 101 and enters the bucket 21b, the assembly 15a contacts the inner surface of the closed end 4 of the bag 2b. As the pusher 101 moves forward, the assembly 15a enters the bag 2b and eventually becomes in the state shown in FIG. In order to bring the bag 2b into the state shown in FIG. 11, the open end 5 is placed on the bucket 21b, and then the compressed air is injected from the outside of the closed end 4 toward the bag 2b. What is necessary is just to enter 21b from the left side of a figure.

In the embodiment of FIG. 11, when the assembly 15a is advanced into the bag 2b using the pusher 101, air is not confined in the bag 2b in front of the assembly 15a, and the compact packaging body 14 is formed. Obtainable.

12 and 13 are a partial cross-sectional view similar to FIG. 9 showing an example of the head portion 136 in the pusher 101 according to the present invention, and a perspective view of the package 14 obtained by using the head portion 136. FIG. The head portion 136 in FIG. 12 is divided into a main plate 151 that is a first plate and an upper sub-plate 152 that is a second plate. Also in the head portion 136, after the upper sub-plate 152 has been withdrawn from the bag 2b, the gusset 61 is formed in the bag 2b using the groove 156 formed in the main plate 151. The bag 2b indicated by the phantom line in FIG. 12 shows a state when the upper subplate 152 has entered the bag 2b, and the bag 2b ′ indicated by the phantom line is the upper subplate 152 has exited. The state where the formation of the town 61 has started is shown. In the package 14 obtained by using the head portion 136, as shown in FIG. 13, the heat seal 2 e formed on the end surface portion 62 of the bag 2 is formed on the end surface portion 62 in the vertical direction of FIG. 13. Not in the center but in a position biased downward. Such an end face portion 62 may be used when printing a large symbol or character that is not preferably divided into two by the heat seal 2e.

The pusher 101 illustrated in FIGS. 6 to 13 and the packaging device 110 including the pusher 101 are also suitable for packaging flexible and easily deformable articles such as sanitary napkins and disposable diapers. It goes without saying that it can be used.

Claims

After the package body is pushed into the bag having the closed end portion and the open end portion which is the opposite end portion from the open end portion, the open end portion is closed while forming towns on both sides of the open end portion. A pusher for pressing the packaged body used in a packaging device for obtaining a packaged body from the bag and the packaged body,
The pusher reciprocates in a direction in which the package body is pushed in and the opposite direction, and a front end portion that enters the bag while being pressed against the package body, and a rear end portion that is the opposite end portion. And a head portion having both side portions extending in parallel with each other in a direction of pressing the package body between the front end portion and the rear end portion,
The front end portion has an air supply port that can ventilate the inside and the outside of the bag through the pusher when the front end portion is inside the bag, and the both side portions are The pusher having an air suction port that allows the town to be formed at the open end of the bag when the front end located inside the bag moves in the opposite direction. .
The air supply port in the front end portion of the head portion is open to the atmosphere between the front end portion and the rear end portion, or behind the rear end portion and the rear end portion. The pusher according to 1.
The pusher according to claim 1, wherein pressurized air can be supplied into the bag from the air supply port at the front end of the head portion.
2. Each of the both side portions of the head portion has a V-shaped groove extending from the front end portion toward the rear end portion, and the air suction port is formed at the bottom of the V-shaped groove. The pusher according to any one of 1 to 3.
After the package body is pushed into the bag having the closed end portion and the open end portion which is the opposite end portion from the open end portion, the open end portion is closed while forming towns on both sides of the open end portion. A pusher for pressing the packaged body used in a packaging device for obtaining a packaged body from the bag and the packaged body,
The pusher reciprocates between a forward movement in the direction of pushing in the packaged body and a backward movement in the opposite direction. The pusher is pressed against the package while being pressed against the packaged body. A head portion having a front portion to enter, a width direction orthogonal to the reciprocating direction, and a thickness direction orthogonal to the reciprocating direction and the width direction;
One of the state in which the head portion is divided into two parts, a first plate and a second plate that overlap in the thickness direction, and the state in which the head part is divided into three parts into a first plate and a second plate and a third plate sandwiching the first plate In the state, a groove having a V-shaped cross section is formed on both sides of the first plate in the width direction so as to extend in the reciprocating direction and is used to form the town. Has an opening connected to the vacuum suction source,
In the forward movement of the pusher, the second plate and the third plate push the packaged body together with the first plate and enter the bag, and in the backward movement of the pusher, The second plate and the third plate are retracted from the bag when the first plate is in a stationary state after being pushed in, and then the first plate is sucked into the bag by the vacuum suction. The head portion is formed so that it can be retracted while applying a vacuum pressure from a source,
The front portion of one of the first, second, and third plates allows the inside and outside of the bag to be in a vented state through the first plate when the front portion is inside the bag. The pusher according to claim 1, wherein the pusher has an air supply port.
The pusher according to claim 5, wherein the second plate and the third plate are integrated behind the head portion.
The pusher according to claim 5 or 6, wherein pressurized air can be supplied into the bag from the air supply port.