JP2021031061A - Sealing device - Google Patents

Abstract

To provide a sealing device capable of avoiding noise generation during operation and deterioration of parts, in a box motion type sealing device in which a cutter can be easily attached and detached without using a tool.SOLUTION: A horizontal sealing device 30 is provided with sealers 31 and 32 arranged one above the other with the packaging film YA1 containing the packaged object XA1 sandwiched between them, a cutter 40 provided so as to project from the sealing surface of at least one of the sealers 31 and 32, a first position capable of urging in a direction in which the cutter 40 protrudes, an operating means 41 configured to be switchable to a second position different from the first position, and holding means 80 that holds a first region 71 on the operating means 41 side which is arranged to face each other in the first position and a second region 72 on the cutter 40 side in a predetermined relative position.SELECTED DRAWING: Figure 5

Description

The present invention relates to a sealing device that seals and cuts a packaging film containing an object to be packaged in the lateral direction of travel.

In a pillow wrapping machine, which is a form of a wrapping machine, an object to be packaged is conveyed together with a tubular film, and a center sealing device and a sealing device are arranged along the conveying direction. The center seal device seals the film-polymerized end of the tubular film. The sealing device seals the tubular film in the lateral direction in the traveling direction (the part where the front and rear packages do not exist) and cuts the tubular film part in which the packaged object at the tip is stored. It will be separated from the subsequent tubular film to manufacture the packaging.

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

In the sealing device described in Patent Document 1, the operating means for urging the blade portion of the tip of the cutter in the direction of projecting from the sealing surface of the sealer is separated from the holding means for the cutter, and the operating means operates normally. At times, the cutter can be positioned so that it can be urged, and at the time of maintenance, the cutter can be positioned so as to open the direction in which it is removed. Further, the upper surface of the upper sealer is provided with a returning means for urging the blade portion of the cutter projected from the sealing surface by the operating means so as to be positioned in the sealer during normal operation. As a result, the operating means (cylinder) is lowered at the time of sealing (when the upper sealer is lowered), and the packaging film can be cut by contacting the holding portion of the cutter and urging downward. Then, after the cutting is completed, the operating means rises to release the urging of the cutter, and the returning means urges the blade portion of the cutter to return to be located in the sealer.

Japanese Patent No. 5306737

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

Specifically, in the above-mentioned sealing device, after the sealing is completed, the operating means rises and separates from the holding portion of the cutter to release the downward urging of the cutter, and the returning means attaches the holding portion upward. It is configured to store the cutter in the sealer by pushing it.

In this case, when the operating means and the holding portion of the cutter are once separated from each other and the operating means rises, the holding portion of the cutter rises due to the urging force of the returning means, and the cutter holding portion moves to the position of the operating means (returning position) with a delay. There is. In other words, due to the timing difference between the rise of the actuating means (cylinder) and the rise of the cutter (holding portion) (particularly, the timing of the rise of the cutter is later), the actuating means and the holding portion of the cutter collide with each other at the return position. As a result, noise is generated at the time of a collision, and parts are frequently worn due to the collision, which causes a problem that deterioration is accelerated.

The delay in the rise of the cutter with respect to the rise of the actuating means is due to the fact that the urging force of the returning means is smaller than the downward urging force of the actuating means. That is, in order to raise the cutter (holding portion) while maintaining contact with the operating means when the operating means is raised, it is sufficient to increase the upward urging force of the returning means, but at the time of cutting. In, the operating means needs to lower the cutter against the urging force of the returning means. Therefore, the upward urging force of the returning means must be smaller than the downward urging force of the operating means, and in the above configuration, the delay of the cutter ascending with respect to the ascending of the operating means is high in the packaging machine. It is so remarkable.

The present invention has been made in view of the above problems, and in a box motion type sealing device in which a cutter can be easily attached and detached without using a tool, noise is generated during operation and parts of the sealing device are generated. It is an object of the present invention to provide a sealing device capable of avoiding deterioration.

The present invention is a sealing device that seals and cuts a wrapping film containing an object to be packaged in the lateral direction of the wrapping film, the sealers arranged vertically on the wrapping film, and the sealer. A cutter provided so as to project from at least one of the sealing surfaces, a first position capable of urging the cutter in a projecting direction, and a second position different from the first position are switched. A holding means for holding the actuating means configured so as to be possible, the first portion on the actuating means side and the second portion on the cutter side, which are arranged to face each other in the first position, at predetermined relative positions. It relates to a sealing device characterized by being provided.

According to the present invention, in a box motion type sealing device in which a cutter can be easily attached and detached without using a tool, a sealing device capable of avoiding noise generation during operation and deterioration of parts can be avoided. Can be provided.

It is a figure which shows an example of the packaging machine which mounts the sealing device which concerns on this invention. It is a front view which shows one preferable embodiment of the sealing device which concerns on this invention. It is sectional drawing which partially broke the upper sealer mounting base of the sealing device of this embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing explaining the operation of the 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 the sealing device 30 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an outline of a packaging machine 10 on which the sealing device 30 according to the embodiment is mounted, and FIG. 2 is a front schematic view showing an example of the sealing device 30 according to the present invention. Is a cross-sectional view in which a part of FIG. 2 is broken. In each drawing of the present embodiment, some configurations will be omitted as appropriate to simplify the drawings. Then, in each figure of the present embodiment, the size, shape, thickness, etc. of the member are appropriately exaggerated and expressed.

The sealing device 30 of the present embodiment is mounted on a packaging machine (for example, a pillow packaging machine) 10 and seals and cuts the packaging film YA1 containing the object to be packaged XA1 in 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, the pillow wrapping machine 10 in which the sealing device (horizontal sealing device) 30 of the present embodiment is incorporated is, for example, a wrapping machine main body 11 and a strip-shaped wrapping film with respect to the wrapping machine main body 11. A film supply device 12 that continuously supplies YA1 and a packaged object transporting and supplying device 14 that is arranged upstream of the packaging machine main body 11 and supplies the packaged object XA1 to the packaging machine body 11 at predetermined intervals. And have.

The film supply device 12 links the output of a drive motor (a motor whose speed can be controlled such as a servomotor) (not shown) to the original roll 16 in which the strip-shaped packaging film YA1 (belt-shaped film 15) is wound in a roll shape. Then, the original roll 16 is supplied to the packaging machine main body 11 at a constant speed while appropriately controlling the rotation speed. Further, various rollers are arranged at predetermined positions from the raw fabric roll 16 to the packaging machine main body 11, and the strip-shaped film 15 sent out from the raw fabric roll 16 is hung on the rollers to pass through a predetermined route. It 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 transporting / supplying device 14 is, for example, attached to sprockets 17 arranged in the front-rear direction (only the front in the traveling direction is described in the figure), endless chains 18 spanned over the plurality of sprockets 17, and the endless chains 18 thereof. It is composed of a plurality of push fingers 19 attached at predetermined pitch intervals. As a result, when the pushing finger 19 abuts on the rear surface of the packaged object XA1, the packaged object 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 a bag of the supplied strip film 15 into a tubular film 21, a center sealing device 24 arranged on the downstream side of the bag making device 20, and a center seal thereof. A belt conveyor 23 arranged on the downstream side of the device 24 and conveying the tubular film 21, an upper holding belt 25 arranged above the belt conveyor 23, and a horizontal sealing device 30 arranged on the downstream side of the belt conveyor 23. And a carry-out conveyor 26 arranged on the downstream side of the horizontal sealing device 30.

The bag making device 20 allows the strip-shaped film 15 continuously supplied from the film supply device 12 to pass through the strip-shaped film 15 so that the both side edge portions 15a of the strip-shaped film 15 are brought into contact (polymerization) with each other, and the tubular shape is formed. The bag is made on the shape film 21. Further, the packaged object XA1 sequentially supplied from the packaged object transporting and supplying device 14 to the packaging machine main body 11 is inserted into the bag making device 20. As a result, the packaged object XA1 supplied to the bag making device 20 is arranged in the tubular film 21 at predetermined intervals.

The upper holding belt 25 is arranged in the immediate vicinity of the upstream side of the horizontal sealing device 30 to prevent the packaged object XA1 in the tubular film 21 from being lifted upward so that it can be conveyed while maintaining a horizontal state. ing.

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

<Horizontal sealing device>
Hereinafter, an example of the horizontal sealing device 30 will be described. The horizontal sealing device 30 of the present embodiment includes the sealers 31 and 32, the cutter 40, the operating means 41, the holding means 80, and the driving mechanism of the sealers 31 and 32.

The sealers (horizontal 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 in a predetermined locus (so-called box motion) while keeping the seal 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 the blade portion 40a at the tip of the cutter 40 can be projected from at least one of the sealing surfaces 31a and 32a. Further, the cutter 40 is detachably attached to the sealers 31 and 32.

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

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

The second position is a position in which the operating means 41 is positioned at a position that opens the direction in which the cutter 40 is removed, and the cutter 40 is urged 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 described in more detail below.

With reference to FIGS. 1 and 2, the horizontal sealing device 30 maintains a state in which a pair of sealers 31 and 32 arranged one above the other with the tubular film 21 interposed therebetween have their sealing surfaces 31a and 32a facing each other. While moving along a predetermined trajectory. That is, both sealers 31 and 32 move closer to each other from the reference position and sandwich the tubular film 21 from above and below to pressurize and heat the film portions in contact with the sealing surfaces 31a and 32a at a predetermined pressure. Then, both the sealers 31 and 32 move forward with each other along the moving direction of the tubular film 21 while maintaining the state of being close to each other and sandwiching the tubular film 21 as described above. The moving speed at this time is equal to the moving speed of the tubular film 21. When the pair of sealers 31 and 32 move by a predetermined distance, the two sealers 31 and 32 move apart from each other and move in the direction opposite to the moving direction of the tubular film 21 to reach the reference position. The upper and lower sealers 31 and 32 are attached to the upper sealer mounting base 33 and the lower sealer mounting base 34, respectively.

FIG. 3 is a cross-sectional view in which the upper sealer mounting base 33 portion of the horizontal sealing device 30 shown in FIG. 2 is partially cut off.

With reference 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 mounting base 33 so as to be vertically movable via the moving base 35. The upper sealer 31 is fixed to the lower surface of the strip-shaped moving table 35. Then, a plurality of guide rods 36 are formed upright on the upper surface of the moving table 35, and the guide rods 36 are inserted into the through holes 33a provided in the upper sealer mounting table 33 and penetrating vertically. As the guide rod 36 reciprocates in the through hole 33a along the axial direction, the guide rod 36, the moving 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 and structure so as not to move downward by a certain distance or more. As a result, the moving table 35 and the upper sealer 31 are prevented from being separated from the upper sealer mounting table 33 and falling. Furthermore, a coil spring 37 is attached to the predetermined guide rod 36, and the moving base 35 and thus the upper sealer 31 are urged downward by the elastic restoring force of the coil spring 37. As a result, when the upper sealer 31 is urged upward by an external force, the coil spring 37 is compressed and deformed while being moved upward. As a result, when the upward urging force is eliminated, the upper sealer 31 smoothly descends due to the elastic restoring force of the coil spring 37 in addition to the own weight of the upper sealer 31 and the like.

Cam floors 38 are arranged on both side surfaces of the upper sealer mounting base 33 and the lower sealer mounting base 34 so as to project outward. The cam floor 38 corresponds to a groove cam provided on a cam plate attached to the inner side surface of a machine frame having a substantially square shape that surrounds the periphery of a tubular film 21 (not shown), and the groove thereof. It revolves as described above according to the shape of the cam. Since the configuration in which the upper and lower sealers 31 and 32 are revolved and moved by using the cam mechanism is conventionally known, detailed description thereof will be omitted. Further, instead of using a cam in this way, a plurality of drive motors such as a drive motor for moving the sealers 31 and 32 up and down and a drive motor for moving the sealers 31 and 32 forward and backward are provided, and each drive motor is appropriately used. The sealers 31 and 32 can be revolved by operating at the timing of.

Further, by appropriately setting the shape of the groove cam of the cam plate, the upper and lower sealers 31 and 32 move forward together with the tubular film 21 while maintaining the state in which the sealing surfaces 31a and 32a are in contact with each other for a certain period of time. Although it moves, the lower sealer 32 urges the upper sealer 31 upward and compresses and deforms the coil spring 37 when the sealing surfaces 31a and 32a come into contact with each other. As a result, the upper and lower sealers 31 and 32 can sandwich the tubular film 21 at a predetermined pressure and heat-seal by receiving a force such as the elastic restoring force of the coil spring 37.

The position of the operating means 41 will be described with reference to FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 3A is a diagram showing a state in which the operating means 41 is in the first position, such as when the lateral sealing device 30 is in operation. FIG. (B) is a diagram showing a state in which the operating means 41 is in the second position, and FIG. 3C is a diagram showing a state in which the operating means 41 is in the first position, and is a guide pin. It is the figure which omitted 43 and guide hole 33c.

The operating means 41 of the present embodiment is configured so that the cutter 40 can be switched between, for example, a first position capable of urging in a direction protruding from the seal surface 31a and a second position different from the first position. Will be done.

With reference to FIG. 4A, through holes 35a and 31b are provided in the moving table 35 and the upper sealer 31 as opposed to the through holes 33b formed in the upper sealer mounting base 33, respectively. The through hole 31b is provided in the central portion of the sealing surface 31a of the upper sealer 31. Further, a through hole 32b is provided at the center of the seal surface 32a of the lower sealer 32 so as to face the through hole 31b.

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

A sawtooth-shaped blade portion 40a is formed at the lower end of the cutter 40. In this case, the cutter 40 moves up and down relative to the lower sealer 32 by receiving a force from an operating means (air cylinder) 41 which is a drive source attached to the upper surface of the upper sealer mounting base 33. Then, at the lowest lowering position (bottom dead center) of the cutter 40, the blade portion 40a protrudes below the sealing surface 31a.

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

Further, the air cylinder 41 is linked to the upper sealer mounting base 33 via an L-shaped mounting bracket 52. That is, 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 a flat plate mounted on the front surface of the upper sealer mounting base 33. It is connected to the connecting plate 53 via a rotating shaft 54 so as to be rotatable forward and reverse. As a result, when the operating means 41 is located in the first position as shown in FIG. 4A, the top plate 52a of the mounting bracket 52 is arranged so as to cover the upper surface of the cutter holder 42. The lower end portion (first pressing portion 71) of the cylinder rod 41a of the air cylinder 41 comes into contact with 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 urged in the direction (downward) in which the blade portion 40a protrudes from the sealing surface 31a.

Then, the operating means 41 rotates the mounting bracket 52 toward the carry-out conveyor 26 side (clockwise in the figure) from the first position shown in FIG. (A) to move the top plate 52a of the mounting bracket 52 to the carry-out conveyor 26 side. By moving to, it is switched to be located in the second position as shown in FIG. 4 (b). When the operating means 41 is located in the second position, the space above the cutter holder 42 is opened, and the first pressing portion 71 of the cylinder rod 41a and the second pressing portion 72 of the cutter holder 42 are separated from each other. As a result, the cutter 40 cannot be urged 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 mounting base 33, and the cutter 40 can be easily cleaned or replaced. Then, in order to reattach the cutter from the state shown in FIG. 4B, the cutter 40 and the guide pin 43 are inserted into the through hole 33b and the guide hole 33c in the upper sealer mounting base 33 opened at the top, respectively. After mounting the upper sealer mounting base 33 on the upper surface, the L-shaped mounting bracket 52 is rotated counterclockwise from the state shown in FIG. 4B, and the top plate 52a is set so as to cover the upper surface of the cutter holder 42. , Return to the state shown in FIG. 4 (a). In this way, the position of the operating means 41 can be alternately switched between the first position and the second position.

Further, in the present embodiment, a mechanism for fixing in the state of FIG. 4A is provided. That is, the clamp lever 52c is attached to the front wall 52b of the L-shaped mounting bracket 52. The crank lever 52c can reciprocate in the horizontal direction (direction orthogonal to the front wall 52b), and the locking portion 52d at the tip thereof is a locking hole of the locking plate 55 provided on the rear surface of the connecting plate 53. It can be inserted into 55a. That is, as shown in FIG. 4A, in the normal state in which the clamp lever 52c is pushed in, the locking portion 52d enters the locking hole 55a and prevents the L-shaped mounting bracket 52 from rotating. .. From this state, the clamp lever 52c is extended and the locking portion 52d is separated from the locking hole 55a (positioned in the through hole 52b'of the front wall 52b), so that the clamp lever 52c is attached as shown in FIG. The metal fitting 52 can be rotated.

The return means 58 will be described with reference to FIG. The returning means 58 includes, for example, at least the urging means 51, and the returning means 58 is moved to the bottom dead center by the operating means 41, and the cutter 40 in a state where the blade portion 40a protrudes below the sealing surface 31a. Is urged in the direction (upper part of the drawing) in which the blade portion 40a returns to the standby position (the position shown in FIG. 3C) in the upper sealer 31.

Specifically, as shown in FIG. 6C, the returning means 58 is realized by a cutter returning spring 51 as an urging means and a cutter returning pin 50. It is preferable to use the urging means 51 as the returning means 58 for returning the cutter 40 to the standby position because it can be realized with a simple configuration. In the present embodiment, the urging means 51 is a coil spring-shaped cutter return spring 51, but may be an elastic member (spring, rubber, or the like) having another shape. Further, the cutter return pin 50 can return the cutter 40 to the standby position in a stable posture, but it 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 concentrically mounted around the outer circumference of the cutter return pin 50, and the cutter return pin 50 is urged upward by the cutter return spring 51. As a result, the cutter return pin 50 comes into contact with both sides of the lower surface of the cutter holder 42 and urges the cutter holder 42 upward.

The drive mechanism of the cutter 40 and the like will be described with reference to FIG. The figure is a cross-sectional view corresponding to FIG. 4C, and schematically shows the returning means 58. In each case, FIG. 5 shows a state in which the operating means 41 is located in the first position and the cutter 40 can move up and down.

FIG. 3A shows a state before lowering in which the cutter 40 is housed in a standby position inside the upper sealer 31. In this state, in the air cylinder 41, the first pressing portion (first portion) 71 at the lower end of the cylinder rod 41a faces the second pressing portion (second portion) 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 operating means (air cylinder) 41 side and a second pressing portion on the cutter 40 side (cutter holder 42) arranged opposite to each other in the first position. A holding means 80 for holding the unit 72 at a predetermined relative position is provided. The details of the holding means 80 will be described later, but for example, the first pressing portion 71 and the second pressing portion 72 are connected by a magnetic force and held at a predetermined relative position. In this example, the predetermined position is a position where the first pressing portion 71 and the second pressing portion 72 face each other and come into contact with each other.

As shown in FIG. 4B, the first pressing portion 71 of the cylinder rod 41a and the second pressing portion 72 of the cutter holder 42 can be separated from each other, but are in contact with each other by the holding means 80. It is connected and held at. Then, as the cylinder rod 41a moves up and down, the first pressing portion 71 and the second pressing portion 72 maintain a connected state and move up and down integrally.

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 urging 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 returning means 58.

Then, as shown in FIG. 3B, the blade portion 40a protrudes below the sealing surface 31a at the lowest lowering position (bottom dead center) of the cutter 40.

On the other hand, the through hole 32b provided in the lower sealer 32 is provided at a position facing the through hole 31b of the upper sealer 31, and the blade portion 40a of the cutter 40 protruding downward from the sealing surface 31a is a tubular film 21 (here). (Not shown) is pushed through and inserted into the through hole 32b. Further, the shape of the blade portion 40a may not be serrated, but may be a sharp blade on a straight line. In that case, it is preferable to arrange a flat receiving blade in the through hole 32b of the lower sealer 32. As a result, the tubular film 21 sandwiched between the blade portion 40a protruding downward and the receiving blade is cut laterally along the blade portion 40a.

As shown in FIG. 3C, when the tubular film 21 is cut, the cylinder rod 41a of the air cylinder 41 rises, and the cutter 40 is returned to the standby position. When the downward urging force of the cylinder rod 41a is released, the cutter 40 moves upward together with the cutter holder 42 by the action of the cutter return spring 51. At this time, the first pressing portion 71 and the second pressing portion 72 are attracted by the magnetic force of the holding means 80 and are connected and held. As a result, the cutter holder 42 is raised integrally with the movement (raising) of the air cylinder 41 (FIG. (D)).

Here, referring to FIGS. (E) to (g), when the holding means 80 is not provided in the configuration in which the cylinder rod 41a and the cutter holder 42 are separated from each other (see FIG. 4B) (conventional). The operation of (structure) will be described. FIGS. (E) to (g) are cross-sectional views corresponding to FIGS. (B) to (d), respectively.

Also in this case, as shown in FIG. 6E, the cylinder rod 41a urges the cutter holder 42 downward against the urging force of the cutter return spring 51, and the tubular film 21 (not shown here). To cut.

Then, as shown in FIG. 3F, when the cylinder rod 41a of the air cylinder 41 rises and the downward urging of the cylinder rod 41a is released, the cutter return spring 51 acts on the cutter holder 42. .. By the way, the upward urging force of the cutter return spring 51 is smaller than the downward urging 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 of 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 receives the repulsive force of the return spring 51 for the cutter, as shown in FIG. 1 A collision with the pressing portion 71 occurs. Since this collision occurs every time the packaging film YA1 is cut, the collision noise causes noise, and repeated collisions cause problems such as wear and tear of parts and accelerated deterioration.

Therefore, in the present embodiment, the holding means 80 is provided. The holding means 80 and the first pressing portion 71 are at least during the period of the raising and lowering operation of the cylinder rod 41a, specifically, during the period when the air cylinder 41 shown in FIG. 4A is located in the first position. The second pressing portion 72 is held at a predetermined relative position (in this example, a position where both are in contact with each other). That is, during the period when the air cylinder 41 is located in the first position, the first pressing portion 71 and the second pressing portion 72 are attracted by the magnetic force of the holding means 80 and are connected and held. As a result, the downward urging force of the cylinder rod 41a is released, and even when the repulsive force of the cutter return spring 51 acts on the cutter holder 42, it is integrated with the movement (rise) of the air cylinder 41 (ascending). The cutter holder 42 can be raised in synchronization (at the same timing). Therefore, it is possible to avoid the generation of noise due to the collision between the second pressing portion 72 and the first pressing portion 71, and to extend the life of the parts (FIGS. (B) to (D)).

<Holding means>
Next, the holding means 80 will be described. 6 and 7 are views showing an example of the holding means 80, and is an enlarged schematic view showing the first pressing portion 71 and the second pressing portion 72 portion shown in FIG. 5 by extracting them.

Specifically, as shown in FIG. 6A, the holding means 80 is a means for generating a magnetic force, for example, a magnet 80A embedded near the center of the first pressing portion 71. In this example, the first pressing portion 71 is made of a hard resin (for example, engineering plastic or the like), and the second pressing portion 72 is made of a metal member (magnetic material) that attracts a magnet. The holding means 80 holds the first pressing portion 71 at the lower end of the cylinder rod 41a of the air cylinder 41 and the second pressing portion 72 of the cutter holder 42 in a state of being in contact (connected) by the magnetic force thereof.

Further, by forming the first pressing portion 71 in which the holding means 80 (magnet 80A) is embedded made of hard resin, the first pressing portion 71 and the second pressing portion 72 are attracted by the magnetic force of the holding means 80 and come into contact with each other. Even in this case, the load related to both can be reduced, and the operating noise at the time of contact and the wear of parts at that time can also be reduced. The first pressing portion 71 may also be made of a metal member.

FIG. 3B 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 portion 72 is made of a hard resin (for example, engineering plastic), and the first pressing portion 71 is made of a metal member. The second pressing portion 72 may also be made of a metal member.

Further, as shown in FIG. 3C, the holding means 80 may be composed of, for example, a magnet 80A embedded in the first pressing portion 71 and a metal member 80B embedded in the second pressing portion 72. In this case, hard resin can be used for both the first pressing portion 71 and the second pressing portion 72.

Further, the magnet 80A and the metal member 80B may be exchanged. That is, the metal member 80B may be embedded in the first pressing portion 71, and the magnet 80A may be embedded in the second pressing portion 72.

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

Further, as shown in FIG. 3D, the holding means 80 has a magnet 80A (for example, an N-pole magnet) and another magnet 80C (for example, an S-pole magnet) having a magnetic pole different from that of the magnet 80A facing each other. And vice versa. In this case as well, hard resin can be used for both the first pressing portion 71 and the second pressing portion 72, but at least one of the first pressing portion 71 and the second pressing portion 72 is made of a metal member. May be good.

Further, as shown in FIGS. (E) and (f), the holding means 80 includes a magnet 80A (for example, an N-pole magnet) and another magnet 80D (for example, an N-pole magnet) having a magnetic pole of the same type. ) May be adopted. In this case, the holding means 80 repels the magnet 80A and the other magnet 80D, and holds the first pressing portion 71 and the second pressing portion 72 in a state of being separated by a predetermined distance D. Then, the cylinder rod 41a and the cutter holder 42 move upward integrally (synchronically and at the same timing) while maintaining the state where the first pressing portion 71 and the second pressing portion 72 are separated by a predetermined distance D. To do. In this example, since there is no contact (contact) between the first pressing portion 71 and the second pressing portion 72, there is an advantage that there is no problem such as operation noise or wear between parts due to the contact between the first pressing portion 71 and the second pressing portion 72. is there.

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

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

FIG. 7 is still another example of the holding means 80. FIG. (A) shows, for example, a configuration in which a recess 72A is formed in the second pressing portion 72, and the first pressing portion 71 is housed 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 portion 71, and the second pressing portion 72 is a metal member. However, the configuration of the holding means 80 other than the shape (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. 3B 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 pressing 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 configuration of the holding means 80 other than the shape (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. 3C shows an example in which the entire first pressing portion 71 and the second pressing portion 72 are used as the holding means 80. The first pressing portion 71 is composed of, for example, a magnet 80A, and the second pressing portion 72 is formed. It is composed of another magnet 80C. In this case as well, the configuration of the holding means 80 other than the shape (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. 3D is an example in which the holding area of the holding means 80 is increased by making the first pressing portion 71 and the second pressing portion 72 inclined surfaces in a side view. In this case as well, the configuration of the holding means 80 other than the shape (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, the holding means 80 uses, for example, an electromagnetic force, a vacuum suction force, a fluid pressure (wind pressure), or the like to bring the first pressing portion 71 and the second pressing portion 72 into a predetermined relative position (contact position). Alternatively, it may be held at a separated position where a predetermined distance D is secured (see FIGS. 6 (e) and 6 (f)).

As described above, the horizontal sealing device 30 according to the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the spirit and technical idea of the present invention.

That is, in the above embodiment, the position, size, length, shape, material, orientation, etc. of each configuration can be appropriately changed.

For example, in the above embodiment, the cutter 40 moves (descends) from the upper side to the lower side to cut the tubular film 21, but the cutter 40 moves (rises) from the lower side to the upper side or laterally. The tubular film 21 may be cut by moving (horizontally moving).

Further, in the above-described embodiment, the case where all of them are applied to the pillow wrapping machine is shown, but the present invention is not limited to this, and can be applied to a four-way seal wrapping machine, a deep drawing wrapping machine and various other wrapping machines. ..

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

Claims (7)

A sealing device that seals and cuts a wrapping film containing an object to be packaged in the lateral direction of the wrapping film.
Sheila placed above and below the wrapping film
A cutter provided so as to project from the sealing surface of at least one of the sealers,
An operating means configured to be switchable between a first position capable of urging the cutter in a protruding direction and a second position different from the first position.
It is provided with a holding means for holding the first portion on the actuating means side and the second portion on the cutter side, which are arranged to face each other in the first position, at predetermined relative positions.
A sealing device characterized by that. The holding means holds the first portion and the second portion in contact with each other.
The sealing device according to claim 1. The holding means holds the first portion and the second portion separated by a predetermined distance.
The sealing device according to claim 1. The holding means is a means for generating a magnetic force.
The sealing device according to any one of claims 1 to 3, wherein the sealing device is characterized in that. A returning means for urging the tip of the cutter protruding from the sealing surface by the operating means in a direction of returning to be located in the sealer is provided.
The sealing device according to any one of claims 1 to 4, wherein the sealing device is characterized in that. The urging force of the returning means is smaller than the magnetic force.
The sealing device according to claim 5, wherein the sealing device according to claim 4 is cited. The second position is a position where the cutter cannot be urged.
The sealing device according to any one of claims 1 to 6, wherein the sealing device is characterized in that.

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