JP7372651B2 - sealing device - Google Patents

Description

The present invention relates to a sealing device that seals and cuts a packaging film enclosing an object in the transverse direction of travel.

In a pillow packaging machine, which is one type of packaging machine, an object to be packaged is transported together with a cylindrical film, and a center sealing device and a sealing device are arranged along the transporting direction. The center seal device seals the overlapping ends of the cylindrical film. The sealing device seals the cylindrical film in the transverse direction of the traveling direction (the part where there are no objects to be packaged before or after it), and also cuts the part of the cylindrical film that contains the objects to be packaged at the tip. It is separated from the subsequent cylindrical film to produce a package.

One form of such a sealing device is a so-called box motion type device that performs sealing and cutting while moving a sealer along a predetermined trajectory. Conventionally, a box motion type sealing device (sealing device) is also known that allows the cutter to be easily attached and detached without using tools (see, for example, Patent Document 1).

In the sealing device described in Patent Document 1, the actuating means for biasing the blade at the tip of the cutter in the direction of protruding from the sealing surface of the sealer is separated from the holding means of the cutter, and the actuating means is separated from the holding means of the cutter during normal operation. At times, the cutter is placed in a biased state, and during maintenance, the cutter is placed in a position where the direction in which the cutter is removed is open. Further, on the upper surface of the upper sealer, a return means is provided which urges the blade of the cutter, which is projected from the sealing surface by the actuating means, in a direction to return to the position within the sealer during normal operation. Accordingly, during sealing (when the upper sealer is lowered), the actuating means (cylinder) descends, contacts the holding portion of the cutter, and urges it downward, thereby cutting the packaging film. After the cutting is completed, the actuating means moves upward to release the bias on the cutter, and the return means biases the blade of the cutter in a direction to return it to position within the sealer.

Patent No. 5306737

However, the sealing device described in Patent Document 1 has problems such as noise generation and accelerated deterioration of parts as the cutter moves during normal operation (sealing).

Specifically, in the above sealing device, after sealing is completed, the actuating means rises and separates from the holding part of the cutter, thereby releasing the downward bias of the cutter, and the return means urges the holding part upward. The structure is such that the cutter is housed within the sealer by pressing the cutter.

In this case, after the actuation means and the cutter holding part are once separated and the actuation means rises, the cutter holding part rises due to the biasing force of the return means and moves to the position of the actuation means (return position) with a delay. There is. In other words, due to a timing difference between the raising of the actuating means (cylinder) and the raising of the cutter (its holding part) (in particular, the timing of the cutter's rise is slower), the actuating means and the cutter's holding part collide at the return position. This results in problems such as noise generation during a collision, frequent wear and tear of parts due to collisions, and accelerated deterioration.

The delay in the rise of the cutter relative to the rise of the actuation means is due to the fact that the downward force of the return means is smaller than the downward force of the actuation means. In other words, in order to raise the cutter (its holding portion) while maintaining contact with the operating means when the operating means is raised, it is sufficient to increase the upward biasing force of the return means, but when cutting In this case, it is necessary for the operating means to lower the cutter against the biasing force of the return means. For this reason, the upward biasing force of the return means must be smaller than the downward biasing force of the actuating means, and in the above configuration, the delay in the rise of the cutter relative to the rise of the actuating means is due to the high speed of the packaging machine. It is quite remarkable.

The present invention has been made in view of the above-mentioned problems, and in a box motion type sealing device that allows the cutter to be easily attached and detached without using tools, noise is generated during operation and parts are not easily removed. It is an object of the present invention to provide a sealing device that can avoid deterioration.

The present invention is a sealing device that seals and cuts a packaging film enclosing an object in a lateral direction in the direction of travel of the packaging film, comprising: a sealer disposed above and below with the packaging film sandwiched therebetween; a cutter provided to be able to protrude from at least one of the sealing surfaces; a first position that is a means for activating the cutter and is biased in a direction in which the cutter is protruded; and the first position. an actuating means configured to be switchable to a second position different from the first position; a first pressing portion on the actuating means side disposed opposite to each other in the first position; and a second pressing portion on the cutter side. and a holding means for holding the and at a predetermined relative position, the holding means being a means for generating magnetic force, and the holding means for holding the holding means at least one of the first pressing part and the second pressing part. The present invention relates to a sealing device characterized in that it is provided in a .

According to the present invention, in a box motion type sealing device that allows the cutter to be easily attached and detached without using tools, the sealing device can avoid noise generation during operation and deterioration of parts. can be provided.

1 is a diagram showing an example of a packaging machine in which a sealing device according to the present invention is mounted. 1 is a front view showing a preferred embodiment of a sealing device according to the present invention. FIG. 2 is a partially cutaway sectional view of the upper sealer mounting base of the sealing device of the present embodiment. FIG. 4 is a sectional view taken along line A-A in FIG. 3. It is a sectional view explaining operation of a cutter in this embodiment. It is a schematic diagram explaining the holding means in this embodiment. It is a schematic diagram explaining the holding means in this embodiment.

<Overall configuration (packaging machine)>
Hereinafter, an example of a sealing device 30 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view schematically showing a packaging machine 10 in which a sealing device 30 according to an embodiment is mounted, FIG. 2 is a front schematic diagram showing an example of a sealing device 30 according to the present invention, and FIG. 2 is a partially cutaway sectional view of FIG. 2. FIG. In addition, in each figure of this embodiment, some structures are omitted as appropriate to simplify the drawings. In each figure of this embodiment, the size, shape, thickness, etc. of the members are appropriately exaggerated.

The sealing device 30 of the present embodiment is installed in a packaging machine (for example, a pillow packaging machine) 10, and seals and cuts a packaging film YA1 enclosing an object to be packaged XA1 in the lateral direction of the traveling direction of the packaging film YA1. It is a horizontal sealing device, and is also called an end sealing device or a top sealing device.

First, referring to FIG. 1, a pillow packaging machine 10 in which a sealing device (horizontal sealing device) 30 of the present embodiment is incorporated includes, for example, a packaging machine body 11 and a band-shaped packaging film for the packaging machine body 11. A film supply device 12 that continuously supplies YA1, and a packaged object conveyance and supply device 14 that is arranged upstream of the packaging machine main body 11 and supplies the packaging material XA1 to the packaging machine main body 11 at predetermined intervals. It has

The film supply device 12 connects the output of a drive motor (speed controllable motor such as a servo motor), not shown, to the original fabric roll 16 obtained by winding the strip-shaped packaging film YA1 (strip-shaped film 15) into a roll. Then, the rotational speed of the original fabric roll 16 is appropriately controlled and supplied to the packaging machine main body 11 at a constant speed. In addition, various rollers are arranged at predetermined positions from the original fabric roll 16 to the packaging machine main body 11, and the strip-shaped film 15 sent out from the original fabric roll 16 is passed through the predetermined path by being wrapped around the rollers. and is guided to the packaging machine main body 11. Of course, in the present invention, it is not always necessary to link the drive motor to the original roll 16, and a feed roller may be provided on the transport path of the packaging film to pull it out.

The packaged object conveyance and supply device 14 includes, for example, sprockets 17 arranged in the front and rear (in the figure, only the front in the direction of travel is shown), an endless chain 18 that is stretched around the plurality of sprockets 17, and an endless chain 18 that connects the endless chain 18. It is composed of a plurality of pushing fingers 19 attached at predetermined pitches. As a result, when the pushing finger 19 hits the rear surface of the object to be packaged XA1, the object to be packaged XA1 also moves forward as the pushing finger 19 moves.

The packaging machine main body 11 includes, for example, a bag making device 20 that makes bags from the supplied strip film 15 into a cylindrical film 21, a center seal device 24 disposed on the downstream side of the bag making device 20, and a center seal device 24 arranged on the downstream side of the bag making device 20. A belt conveyor 23 disposed on the downstream side of the device 24 and conveying the tubular film 21, an upper restraining belt 25 disposed above the belt conveyor 23, and a horizontal sealing device 30 disposed on the downstream side of the belt conveyor 23. and a discharge conveyor 26 disposed downstream of the horizontal sealing device 30.

The bag making device 20 allows the strip film 15 that is continuously supplied from the film supply device 12 to pass therethrough, thereby bringing the both side edges 15a of the strip film 15 into contact with each other (polymerization), and forming a cylindrical tube. The bag is made into a shaped film 21. Furthermore, the objects to be packaged XA1, which are sequentially supplied from the object to be packaged transport and supply device 14 to the packaging machine main body 11, are inserted into the bag making machine 20. Thereby, the objects to be packaged XA1 supplied to the bag making device 20 are arranged within the tubular film 21 at predetermined intervals.

The upper restraining belt 25 is disposed immediately on the upstream side of the horizontal sealing device 30, and prevents the packaged object XA1 within the cylindrical film 21 from being lifted upward, so that it can be conveyed while maintaining a horizontal state. ing.

The lateral sealing device 30 seals and cuts the cylindrical film 21 in a direction perpendicular to the traveling direction, that is, in a transverse direction (film width direction). The part of the film to be sealed and cut is a predetermined position between the front and rear packaged objects XA1. Thereby, by passing through the horizontal sealing device 30, the leading portion of the cylindrical film 21 is separated from the trailing portion, and a package ZA1 is manufactured.

<Horizontal sealing device>
An example of the horizontal sealing device 30 will be described below. The horizontal sealing device 30 of this embodiment includes sealers 31 and 32, a cutter 40, an actuation means 41, a holding means 80, and a drive mechanism for the sealers 31 and 32.

Sealers (lateral sealer, top sealer, or end sealer) 31 and 32 are arranged one above the other with the packaging film YA1 in between. The drive mechanism moves the sealers 31 and 32 along a predetermined trajectory (so-called box motion) while maintaining the sealing surfaces 31a and 32a of the sealers 31 and 32 facing each other.

The cutter 40 is movable in the vertical direction inside at least one of the sealers 31 and 32, and is provided so that a blade portion 40a at the tip of the cutter 40 can protrude from at least one of the sealing surfaces 31a and 32a. Further, the cutter 40 is removably attached to the sealers 31 and 32.

The actuation means 41 is, for example, a cylinder (for example, an air cylinder), and is configured to be able to switch the cutter 40 between a first position and a second position different from the first position.

The first position is a position in which the actuating means 41 is positioned so as to block the direction in which the cutter 40 is removed, and is a position in which the cutter 40 can be biased in a direction in which the blade portion 40a protrudes from at least one of the seal surfaces 31a and 32a. It is.

The second position is a position in which the actuating means 41 is positioned to open the direction in which the cutter 40 is removed, and the cutter 40 is biased in the direction in which the blade portion 40a protrudes from at least one of the sealing surfaces 31a and 32a. This is an impossible position. This will be explained in more detail below.

Referring to FIGS. 1 and 2, in the horizontal sealing device 30, a pair of sealers 31 and 32 arranged above and below with a tubular film 21 in between maintains a state in which their sealing surfaces 31a and 32a are opposed to each other. while moving along a predetermined trajectory. In other words, the sealers 31 and 32 move closer to each other from the reference position and sandwich the cylindrical film 21 from above and below, thereby applying a predetermined pressure and heating the portion of the film in contact with the sealing surfaces 31a and 32a. Then, both sealers 31 and 32 move forward in the direction of movement of the cylindrical film 21 while maintaining the state in which they approach each other and sandwich the cylindrical film 21 as described above. The moving speed at this time is equal to the moving speed of the cylindrical film 21. When the pair of sealers 31 and 32 move by a predetermined distance, both sealers 31 and 32 move away from each other and move in the opposite direction to the moving direction of the cylindrical film 21 to reach the reference position. These upper and lower sealers 31 and 32 are attached to an upper sealer mount 33 and a lower sealer mount 34, respectively.

FIG. 3 is a partially cutaway sectional view of the upper sealer mount 33 of the horizontal sealing device 30 shown in FIG. 2. As shown in FIG.

Referring to FIG. 3, the lower sealer 32 is fixed to the upper surface of the lower sealer mount 34 and moves integrally with the lower sealer mount 34. The upper sealer 31 is attached to the lower surface of the upper sealer mount 33 via a movable table 35 so as to be movable up and down. The upper sealer 31 is fixed to the lower surface of a band-shaped movable table 35. A plurality of guide rods 36 are formed upright on the upper surface of the movable base 35, and these guide rods 36 are inserted into through holes 33a provided in the upper sealer mounting base 33 and penetrating vertically. As the guide rod 36 reciprocates in the through hole 33a along the axial direction, the guide rod 36, as well as the movable table 35 and the upper sealer 31, also move up and down. Further, the tip (upper end) of the guide rod 36 is attached to the upper sealer mounting base 33 by an appropriate mechanism or structure so as not to move downward by more than a certain distance. This prevents the movable table 35 and the upper sealer 31 from detaching from the upper sealer mounting base 33 and falling. Furthermore, a coil spring 37 is attached to a predetermined guide rod 36, and the elastic restoring force of the coil spring 37 urges the movable table 35 and thus the upper sealer 31 downward. As a result, when the upper sealer 31 is urged upward by an external force, it moves upward while compressing and deforming the coil spring 37. As a result, when the upward biasing force is released, the upper sealer 31 smoothly moves downward due to the elastic restoring force of the coil spring 37 in addition to the weight of the upper sealer 31 and the like.

Cam floors 38 are arranged on both sides of the upper sealer mount 33 and the lower sealer mount 34 so as to protrude outward. This cam floor 38 corresponds to a groove cam provided on a cam plate attached to the inner surface of the machine frame, which basically has a substantially square shape that surrounds the periphery of the cylindrical film 21 (not shown). The above-mentioned revolution moves according to the shape of the cam. Note that the configuration for revolving the upper and lower sealers 31, 32 using such a cam mechanism is conventionally known, so detailed explanation thereof will be omitted. Moreover, instead of using a cam as described above, a plurality of drive motors are provided, such as a drive motor for moving the sealers 31 and 32 up and down and a drive motor for moving them forward and backward, and each drive motor is operated as appropriate. By operating at the timing of , the sealers 31 and 32 can also be moved in revolution.

In addition, by appropriately setting the shape of the grooved cam of the cam plate, the upper and lower sealers 31 and 32 move forward together with the cylindrical film 21 for a certain period of time while keeping their sealing surfaces 31a and 32a in contact with each other. However, when the sealing surfaces 31a and 32a come into contact with each other, the lower sealer 32 urges the upper sealer 31 upward and the coil spring 37 is compressed and deformed. Thereby, under the force of the elastic restoring force of the coil spring 37, the upper and lower sealers 31 and 32 can sandwich and heat-seal the cylindrical film 21 with a predetermined pressure.

With reference to FIG. 4, the position of the actuating means 41 will be explained. This figure is a cross-sectional view taken along the line A-A in FIG. Figure (b) is a diagram showing a state in which the actuating means 41 is in the second position, and Figure (c) is a diagram showing a state in which the actuating means 41 is in the first position, with the guide pin 43 and a guide hole 33c are omitted.

The actuating means 41 of this embodiment is configured to be switchable between a first position in which the cutter 40 can be biased in a direction protruding from the sealing surface 31a, and a second position different from the first position. be done.

Referring to FIG. 4A, through holes 35a and 31b are provided in the movable table 35 and the upper sealer 31, respectively, to face the through hole 33b formed in the upper sealer mounting base 33. The through hole 31b is provided at the center of the sealing surface 31a of the upper sealer 31. Further, a through hole 32b is provided in the center of the sealing surface 32a of the lower sealer 32, facing the through hole 31b.

These through holes 31b, 35a, 33b, and 32b are located on the same plane, and the cutter 40 is inserted into each of these through holes 31b, 35a, 33b, and 32b so as to be movable up and down.

This cutter 40 has a serrated blade portion 40a formed at its lower end. In this case, the cutter 40 moves up and down relative to the lower sealer 32 by receiving force from an actuating means (air cylinder) 41 that is a driving source and is attached to the upper surface of the upper sealer mount 33. At the lowest position (bottom dead center) of the cutter 40, the blade portion 40a protrudes below the sealing surface 31a.

The cutter 40 is connected to a cutter holder 42 at its upper end. The cutter holder 42 has a guide pin 43 extending downward parallel to the cutter 40, and the guide pin 43 is inserted into a guide hole 33c provided in the upper sealer mounting base 33. Thereby, the guide pin 43 moves up and down within the guide hole 33c, so that the cutter 40 can stably move up and down.

Furthermore, the air cylinder 41 is linked to the upper sealer mounting base 33 via an L-shaped mounting bracket 52. In other words, the air cylinder 41 is connected to the top plate 52a of the L-shaped mounting bracket 52, and the lower end of the front wall 52b of the L-shaped mounting bracket 52 is connected to the flat plate-shaped top plate 52a attached to the front surface of the upper sealer mounting base 33. It is connected to the connection plate 53 via a rotating shaft 54 so as to be rotatable in forward and reverse directions. As a result, when the actuating means 41 is located at the first position as shown in FIG. The lower end portion (first pressing portion 71) of the cylinder rod 41a of the air cylinder 41 contacts the second pressing portion 72 provided on the upper surface of the cutter holder 42. Then, by lowering the cylinder rod 41a, the cutter 40 can be biased in a direction (downward) in which the blade portion 40a protrudes from the sealing surface 31a.

The actuating means 41 then rotates the mounting bracket 52 toward the carry-out conveyor 26 (clockwise in the figure) from the first position shown in FIG. By moving it to the second position, it is switched to the second position as shown in FIG. 4(b). When the actuating means 41 is located at the second position, the space above the cutter holder 42 is open, and the first pressing portion 71 of the cylinder rod 41a and the second pressing portion 72 of the cutter holder 42 are separated. This makes it impossible to urge the cutter 40 downward.

By opening the space above the cutter holder 42 in this way, the cutter 40 together with the cutter holder 42 can be removed from the upper sealer mount 33, and the cutter 40 can be easily cleaned, replaced, etc. To attach the cutter again from the state shown in FIG. 4(b), the cutter 40 and guide pin 43 are inserted into the through hole 33b and guide hole 33c, respectively, in the upper sealer mounting base 33 whose top is open. After attaching the upper sealer mounting base 33 to the cutter holder 42, rotate the L-shaped mounting bracket 52 counterclockwise from the state shown in FIG. , returns to the state shown in FIG. 4(a). In this way, the position of the actuating means 41 can be switched alternately between the first position and the second position.

Furthermore, in this embodiment, a mechanism for fixing in the state shown in FIG. 4(a) is provided. That is, the clamp lever 52c is attached to the front wall 52b of the L-shaped mounting bracket 52. This crank lever 52c can reciprocate in the horizontal direction (direction perpendicular to the front wall 52b), and a locking portion 52d at the tip thereof is connected to a locking hole in a locking plate 55 provided on the rear surface of the connecting plate 53. It can be inserted into 55a. That is, in the normal state where the clamp lever 52c is fully pushed in as shown in FIG. 4(a), the locking portion 52d enters into the locking hole 55a and prevents the L-shaped mounting bracket 52 from rotating. . From this state, the clamp lever 52c is advanced and the locking portion 52d is disengaged from the locking hole 55a (positioned in the through hole 52b' of the front wall 52b), so that the mounting is completed as shown in FIG. This allows the metal fitting 52 to rotate.

The return means 58 will be explained with reference to FIG. The return means 58 includes, for example, at least a biasing means 51, and the cutter 40 is moved to the bottom dead center by the actuating means 41, with the blade portion 40a protruding below the sealing surface 31a. The blade portion 40a is urged in the direction (upward in the figure) to return to the standby position within the upper sealer 31 (the position shown in FIG. 3(c)).

Specifically, the return means 58 is realized by a cutter return spring 51 as a biasing means and a cutter return pin 50, as shown in FIG. 3(c). It is preferable to use the biasing means 51 as the return means 58 for returning the cutter 40 to the standby position in this way because it can be realized with a simple configuration. In this embodiment, the biasing means 51 is a cutter return spring 51 in the form of a coil spring, but it may be an elastic member of another shape (a spring, rubber, etc.). Further, the cutter return pin 50 can return the cutter 40 to the standby position in a stable posture, but may be omitted.

The cutter return pin 50 is attached to the upper surface of the upper sealer mounting base 33 at a position facing both sides of the lower surface of the cutter holder 42 . A cutter return spring 51 is mounted concentrically around the outer periphery of the cutter return pin 50, and the cutter return pin 50 is urged upward by the cutter return spring 51. Thereby, the cutter return pin 50 comes into contact with both sides of the lower surface of the cutter holder 42 and urges it upward.

The drive mechanism of the cutter 40 and the like will be described with reference to FIG. 5. This figure is a sectional view corresponding to FIG. 4(c), and schematically shows the return means 58. In both FIGS. 5A and 5B, the operating means 41 is located at the first position, and the cutter 40 is movable up and down.

4A shows a state in which the cutter 40 is housed in a standby position inside the upper sealer 31 before being lowered. In this state, the air cylinder 41 has a first pressing part (first part) 71 at the lower end of the cylinder rod 41a facing a second pressing part (second part) 72 provided on the upper surface of the cutter holder 42. and are in contact with each other.

Here, the horizontal sealing device 30 of the present embodiment has a first pressing portion 71 on the actuating means (air cylinder) 41 side and a second pressing portion 71 on the cutter 40 side (cutter holder 42) which are arranged opposite to each other in the first position. A holding means 80 is provided for holding the portion 72 at a predetermined relative position. Although details of the holding means 80 will be described later, for example, the first pressing part 71 and the second pressing part 72 are connected by magnetic force and held at a predetermined relative position. In this example, the predetermined position is a position where the first pressing part 71 and the second pressing part 72 face each other and are in contact with each other.

As shown in FIG. 4(b), the first pressing part 71 of the cylinder rod 41a and the second pressing part 72 of the cutter holder 42 are configured to be able to separate, but are in a state in which they are in contact with each other by the holding means 80. It is connected and maintained. As the cylinder rod 41a moves up and down, the first pressing part 71 and the second pressing part 72 move up and down integrally while maintaining the connected state.

That is, as shown in FIG. 5A, when the air cylinder 41 (cylinder rod 41a) urges the cutter holder 42 downward, the cutter 40 also moves downward together with the cutter holder 42.

At this time, the return means 58 (cutter return spring 51) urges the cutter holder 42 upward. The upward biasing force of the cutter return spring 51 is smaller than the downward pressing force of the cylinder rod 41a. That is, the cylinder rod 41a urges the cutter holder 42 downward against the urging force of the cutter return spring 51. Further, the magnetic force of the holding means 80 is set to be larger than the urging force of the return means 58.

As shown in FIG. 4B, at the lowest position (bottom dead center) of the cutter 40, the blade portion 40a protrudes below the sealing surface 31a.

On the other hand, the through hole 32b provided in the lower sealer 32 is provided at a position opposite to the through hole 31b of the upper sealer 31, and the blade portion 40a of the cutter 40 protruding below the sealing surface 31a is connected to the cylindrical film 21 (here (not shown) and is inserted into the through hole 32b. Moreover, the shape of the blade portion 40a may not be serrated, but may be a straight, sharp blade. In that case, it is preferable to arrange a flat receiving blade inside the through hole 32b of the lower sealer 32. Thereby, the cylindrical film 21 sandwiched between the downwardly protruding blade part 40a and the receiving blade is cut in the transverse direction along the blade part 40a.

As shown in FIG. 4C, when the tubular film 21 is cut, the cylinder rod 41a of the air cylinder 41 rises, returning the cutter 40 to the standby position. When the downward urging force by the cylinder rod 41a is released, the cutter 40 moves upward together with the cutter holder 42 due to the action of the cutter return spring 51. At this time, the first pressing part 71 and the second pressing part 72 are attracted by the magnetic force of the holding means 80 and are held connected. As a result, the cutter holder 42 rises integrally with the movement (rise) of the air cylinder 41 (FIG. 4(d)).

Here, referring to FIGS. 4(e) to 4(g), in the case where the holding means 80 is not provided in the configuration in which the cylinder rod 41a and the cutter holder 42 are separated (see FIG. 4(b)) (conventional The operation of (structure of) will be explained. Figures (e) to (g) are cross-sectional views corresponding to (b) to (d), respectively.

In this case as well, as shown in FIG. 4(e), the cylinder rod 41a urges the cutter holder 42 downward against the urging force of the cutter return spring 51, and the cylindrical film 21 (not shown here) cut.

Then, as shown in FIG. 4F, when the cylinder rod 41a of the air cylinder 41 rises and the downward bias of the cylinder rod 41a is released, the cutter return spring 51 acts on the cutter holder 42. . Incidentally, the upward biasing force of the cutter return spring 51 is smaller than the downward biasing force of the cylinder rod 41a, and in this case, the first pressing portion 71 and the second pressing portion 72 are not connected and held. Therefore, when the downward urging force by the cylinder rod 41a is released, the cutter 40 moves upward together with the cutter holder 42 with a slight delay in the rise of the cylinder rod 41a. In addition, since the cutter holder 42 is receiving the repulsive force of the cutter return spring 51, as shown in FIG. A collision with the first pressing portion 71 occurs. Since this collision occurs every time the packaging film YA1 is cut, the collision sound causes noise, and repeated collisions also cause problems such as premature deterioration of parts, such as wear and damage.

Therefore, in this embodiment, the holding means 80 is provided. The holding means 80 is held in contact with the first pressing portion 71 at least during the period when the cylinder rod 41a is being moved up and down, specifically, during the period when the air cylinder 41 is located at the first position as shown in FIG. 4(a). The second pressing portion 72 is held at a predetermined relative position (in this example, a position where the two are in contact with each other). That is, while the air cylinder 41 is in the first position, the first pressing part 71 and the second pressing part 72 are attracted by the magnetic force of the holding means 80 and are held connected. As a result, even if the downward urging force by the cylinder rod 41a is released and the repulsive force of the cutter return spring 51 acts on the cutter holder 42, the movement (rise) of the air cylinder 41 and ( The cutter holder 42 can be raised (synchronized and at the same timing). Therefore, generation of noise due to collision between the second pressing part 72 and the first pressing part 71 can be avoided, and the lifespan of the parts can be extended (FIG. 2(b) to FIG. 2(d)).

<Holding means>
Next, the holding means 80 will be explained. 6 and 7 are diagrams showing an example of the holding means 80, and are enlarged schematic diagrams extracting and showing the first pressing portion 71 and second pressing portion 72 portions shown in FIG. 5. FIG.

Specifically, as shown in FIG. 3A, the holding means 80 is a means for generating magnetic force, and is, for example, a magnet 80A embedded near the center of the first pressing portion 71. In this example, the first pressing part 71 is made of hard resin (for example, engineering plastic), and the second pressing part 72 is made of a metal member (magnetic material) that attracts a magnet. The holding means 80 holds the first pressing part 71 at the lower end of the cylinder rod 41a of the air cylinder 41 and the second pressing part 72 of the cutter holder 42 in contact (connection) with each other by its magnetic force.

Moreover, by configuring the first pressing part 71 in which the holding means 80 (magnet 80A) is embedded with a hard resin, the first pressing part 71 and the second pressing part 72 are attracted by the magnetic force of the holding means 80 and come into contact with each other. Even in such a case, the load on both parts can be reduced, and the operational noise at the time of contact and the wear and tear of the parts at that time can also be reduced. Note that the first pressing portion 71 may also be made of a metal member.

FIG. 2B shows a configuration in which the holding means 80 (magnet 80A) is embedded near the center of the second pressing portion 72. In this example, the second pressing part 72 is made of hard resin (for example, engineering plastic), and the first pressing part 71 is made of a metal member. Note that the second pressing portion 72 may also be made of a metal member.

Further, as shown in FIG. 2C, the holding means 80 may be composed of, for example, a magnet 80A embedded in the first pressing part 71 and a metal member 80B embedded in the second pressing part 72. In this case, both the first pressing section 71 and the second pressing section 72 can be made of hard resin.

Moreover, the magnet 80A and the metal member 80B may be replaced. That is, a configuration may be adopted in which the metal member 80B is embedded in the first pressing portion 71 and the magnet 80A is embedded in the second pressing portion 72.

Furthermore, at least one of the first pressing section 71 and the second pressing section 72 may be made of a metal member.

Further, as shown in FIG. 8D, the holding means 80 has a magnet 80A (for example, a north pole magnet) and another magnet 80C (for example, a south pole magnet) having a different magnetic pole than the magnet 80A facing each other. (or vice versa). In this case, both the first pressing section 71 and the second pressing section 72 can be made of hard resin, but at least one of the first pressing section 71 and the second pressing section 72 may be made of a metal member. Good too.

Further, as shown in FIGS. 8(e) and 7(f), the holding means 80 includes a magnet 80A (for example, a north-pole magnet) and another magnet 80D having the same type of magnetic pole (for example, a north-pole magnet). ) may be adopted. In this case, the holding means 80 holds the first pressing part 71 and the second pressing part 72 apart by a predetermined distance D by repelling the magnet 80A and another magnet 80D. Then, the cylinder rod 41a and the cutter holder 42 move upward integrally (synchronously and at the same timing) while maintaining the state in which the first pressing part 71 and the second pressing part 72 are separated by a predetermined distance D. do. In this example, since there is no contact (abutment) between the first pressing part 71 and the second pressing part 72, there is no problem such as generation of operation noise or wear of parts caused by contact between the two parts. be.

In addition, in FIG. 6, the holding area by the holding means 80 is secured to be larger than the cross-sectional area (the cross-sectional area in the direction perpendicular to the axis) of the cylinder rod 41a. The holding area of the holding means 80 is, for example, 1.5 to 2 times as large as the cross-sectional area of the cylinder rod 41a. By ensuring a large holding area of the holding means 80, stable holding is possible.

However, the present invention is not limited to this, and the area held by the holding means 80 may be equal to the cross-sectional area of the cylinder rod 41a, for example.

FIG. 7 shows still another example of the holding means 80. 4A shows a configuration in which, for example, a recess 72A is formed in the second pressing part 72, and the first pressing part 71 is accommodated in the recess 72A. In this example, the holding means 80 is, for example, a magnet 80A provided on the surface (bottom surface) of the first pressing section 71, and the second pressing section 72 is a metal member. However, the structure of the holding means 80 other than the shape (the arrangement and combination with the magnet 80A, the metal member 80B, and the other magnets 80C and 80D) may be any of the examples shown in FIG.

FIG. 2B shows a configuration in which a concave portion 71A is formed in the first pressing portion 71, a convex portion 72A is formed in the second press portion 72, and the convex portion 72A is accommodated in the concave portion 71A. In this example, the holding means 80 is, for example, a magnet 80A that constitutes the entire first pressing portion 71, and another magnet 80C that constitutes the entire convex portion 72A of the second pressing portion 72. In this case as well, the structure of the holding means 80 other than the shape (the arrangement and combination with the magnet 80A, the metal member 80B, and the other magnets 80C and 80D) may be any of the examples shown in FIG.

The same figure (c) is an example in which the entirety of the first pressing part 71 and the second pressing part 72 is used as a holding means 80, in which the first pressing part 71 is made up of a magnet 80A, and the second pressing part 72 It is composed of another magnet 80C. In this case as well, the structure of the holding means 80 other than the shape (the arrangement and combination with the magnet 80A, the metal member 80B, and the other magnets 80C and 80D) may be any of the examples shown in FIG.

FIG. 2D shows an example in which the holding area of the holding means 80 is increased by forming the first pressing part 71 and the second pressing part 72 into inclined surfaces when viewed from the side. In this case as well, the structure of the holding means 80 other than the shape (the arrangement and combination with the magnet 80A, the metal member 80B, and the other magnets 80C and 80D) may be any of the examples shown in FIG.

Further, although not shown in the drawings, the holding means 80 holds the first pressing part 71 and the second pressing part 72 at a predetermined relative position (a contact position, Alternatively, it may be held at a separated position with a predetermined distance D (see FIGS. 6(e) and 6(f)).

As described above, the lateral sealing device 30 according to the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and technical idea of the present invention.

That is, in the above embodiments, the position, size, length, shape, material, orientation, etc. of each component can be changed as appropriate.

For example, in the above embodiment, the cutter 40 cuts the tubular film 21 by moving downward (downward) from above, but the cutter 40 moves upward (upward) from below or in the lateral direction. The structure may be such that the cylindrical film 21 is cut by moving (horizontal movement).

Furthermore, although the above-described embodiments show cases in which the invention is applied to a pillow packaging machine, the present invention is not limited to this, and can be applied to a four-side seal packaging machine, a deep-draw packaging machine, and other various packaging machines. .

10 Pillow packaging machine 11 Packaging machine main body 12 Film supply device 14 Packaged object conveyance and supply device 21 Tubular film 24 Center seal device 30 Sealing device 31 Upper sealer 32 Lower sealer 40 Cutter 41 Air cylinder 42 Cutter holder 40a Blade section
50 Cutter return pin 51 Cutter return spring 52 Mounting bracket 52d Locking part (fixing means)
55a Locking hole (fixing means)
58 Returning means 71 First part (first pressing part)
72 Second part (second pressing part)
80 Holding means 80A, 80C, 80D Magnet XA1 Object to be packaged

Claims (6)

A sealing device that seals and cuts a packaging film enclosing a packaged item in a direction transverse to the direction in which the packaging film travels, the sealing device comprising:
a sealer disposed above and below the packaging film;
a cutter provided so as to be able to protrude from the sealing surface of at least one of the sealers;
means for operating the cutter, the operating means being configured to be switchable between a first position in which the cutter can be biased in a protruding direction and a second position different from the first position; ,
a holding means for holding a first pressing part on the actuating means side and a second pressing part on the cutter side, which are arranged facing each other in the first position, at a predetermined relative position;
The holding means is means for generating magnetic force,
The holding means is provided on at least one of the first pressing part and the second pressing part,
A sealing device characterized by: The first pressing portion is a lower end portion of the actuating means, and the second pressing portion is an upper surface of the holder of the cutter.
The sealing device according to claim 1, characterized in that: The holding means holds the first pressing portion and the second pressing portion in contact with each other.
The sealing device according to claim 1 or claim 2, characterized in that: return means for urging the tip of the cutter protruding from the sealing surface in a direction to return it to position within the sealer by the actuation means;
The sealing device according to any one of claims 1 to 3, characterized in that: The biasing force of the return means is smaller than the magnetic force.
The sealing device according to claim 4, characterized in that: the second position is a position in which the cutter cannot be energized;
The sealing device according to any one of claims 1 to 5, characterized in that:

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