JP2015205708A - Top seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a top seal device having high durability to achieve a long life, and enabling high-speed operation.SOLUTION: There are included: a pair of vertical top sealers 21 and 22 arranged with a packaging film sandwiched therebetween; a drive mechanism elevating/lowering the top sealers while keeping a state that the seal surfaces of the top sealers are opposed to each other; and a top cutter 30 vertically movably arranged on the upper top sealer. A motor 40 where an output axis 46 moves linearly in an axial direction is used, as a driving source for energizing the top cutter to a direction where a cutting part of the tip of the top sealer is projected from the seal surface. The elastic restoration force of a cutter return spring 35 is used for the vertical movement of the top cutter.

Description

  The present invention relates to a top seal device used for a packaging machine, and more specifically to a top seal device provided with a top cutter.

  A pillow packaging machine, which is one form of a packaging machine, has the following configuration. First, a belt-like film wound around a raw film is continuously supplied to a bag making device, and a tubular film formed into a tubular shape is formed when the bag making device is passed through. In addition, an article transporting and supplying device is arranged on the upstream side of the bag making device, and an object to be packaged conveyed at predetermined intervals from the object to be packaged conveying and supplying device is supplied into the bag making device. Accordingly, when the article to be packaged passes through the bag making machine, the article to be packaged is stored at predetermined intervals in the cylindrical film, and the article to be packaged is conveyed together with the cylindrical film. A center seal device and a top seal device are arranged along the conveying direction. The center seal device seals the film polymerization end of the tubular film. The top seal device seals a predetermined position of the tubular film (the portion where the front and rear packaging objects do not exist) in the lateral direction of the traveling direction and cuts the cylindrical film in which the front packaging object is stored. A part of the film is separated from the subsequent cylindrical film to produce a package.

  The top seal device for forming the top seal portion of the pillow package includes a pair of upper and lower top sealers, and a concave groove is formed at the center of the seal surface of the top sealer. And the top cutter is arrange | positioned in the ditch | groove of an upper sealer. This top cutter can move up and down relatively with respect to the top sealer. Thereby, it can seal by pinching | interposing a cylindrical film with a pair of top sealers, Furthermore, a top cutter descend | falls and the front-end | tip protrudes below a sealing surface, The sealing site | part of a cylindrical film is carried out. Cut. The top cutter is moved up and down, for example, by driving an air cylinder (Patent Document 1).

JP 2010-36977 A

  The conventional method using an air cylinder as the driving source of the top cutter has the following problems. As the cylinder rod of the air cylinder reciprocates, the packing moves in contact with the inner wall surface of the cylinder. Therefore, a load is applied to the packing every time it is moved. For example, when the top seal is operated at a high speed of about 300 times per minute, it is necessary to replace the packing once a month. In addition, if an even higher speed operation is attempted, the air cylinder may not be able to handle it.

  In order to solve the above-described problems, the top seal device of the present invention is (1) a top seal device that seals and cuts a packaging film containing an article to be packaged in the lateral direction of the packaging film in the traveling direction. A pair of top sealers arranged with the packaging film sandwiched between them, a drive mechanism for moving the pair of top sealers close to and away from each other while maintaining a state in which the seal surfaces of the pair of top sealers are opposed to each other, and the pair of tops A top cutter disposed in at least one of the sealers so as to be movable in the approaching and separating direction in the top sealer, and the top of the top cutter in a direction of projecting from the sealing surface Using a motor in which the output shaft moves linearly in the axial direction as a drive source for biasing the cutter, the bias is based on the movement of the output shaft. It was to be performed.

  By using a motor, the contact resistance when the output shaft as a mover reciprocates is small, and packing is not required unlike an air cylinder that is generally used in the related art. Therefore, the durability is high and the life can be extended. Furthermore, high-speed response is possible by using a motor drive.

  (2) The movement in the direction in which the top cutter protruding from the sealing surface is housed in the top sealer may be made by using an elastic restoring force of a spring. By doing so, it is sufficient to control the energization of the motor, and it is not necessary to switch the direction of energization, so the control becomes simple. In addition, since the energization time is shortened, for example, heat generation can be suppressed.

  (3) The motor includes a plurality of permanent magnets attached to the output shaft, and an electromagnet disposed around the outer periphery of the permanent magnet, and the magnetization direction of the plurality of permanent magnets is the axial direction of the output shaft. The magnets are parallel, the magnetization directions of the adjacent permanent magnets are reversed, the electromagnet has a plurality of coil windings arranged in the axial direction, and the adjacent coil windings are formed in a reverse winding. Good. This is preferable because a large biasing force can be generated with a simple configuration.

  (4) It is good to arrange | position a magnetic body between the opposing end surfaces of the said permanent magnet which adjoins. The magnetic body corresponds to a washer in the embodiment. Since the magnetic material constitutes the magnetic path, the magnetic resistance is small, and the magnetic flux output from the end face of the permanent magnet can be smoothly output radially outward.

(5) The motor may include a heat dissipation structure. Since heat is generated by energizing the electromagnet, such heat generation may be radiated. There are two types of heat dissipating structures: those that naturally dissipate heat depending on their shape and material, and structures and mechanisms that forcibly cool. Examples of the structure for natural heat dissipation include (6) to (8) shown below.
(6) A plurality of concave grooves extending in the axial direction may be formed on the inner peripheral surface of the housing that houses the electromagnet. If it does in this way, a ditch | groove may become a path | route of heat dissipation. (7) The housing may be composed of a member having good thermal conductivity. (8) The electromagnet may be configured by mounting the coil winding on a coil bobbin, and the coil bobbin may be configured by a nonmagnetic member having good thermal conductivity. (9) A forced air cooling mechanism for supplying a cooling gas to the motor may be provided. In the example body, air using compressed air is a cooling gas, but the present invention may use a gas other than air. The cooling gas is not limited to a particularly low temperature, and may be a low temperature.

  The top seal device of the present invention can be applied to various packaging machines. And as an example of the packaging machine to be applied, for example, a bag making device for bag-making a continuously supplied belt-like film into a cylindrical shape, and an upstream side of the bag making device, the bag making device A packaged article conveying and supplying apparatus for conveying and supplying an article to be packaged, a center seal apparatus for sealing the polymerization end of the tubular film formed into a cylindrical shape, and disposed on the downstream side of the center seal apparatus, There is a pillow packaging machine provided with a top seal device that seals and cuts in the width direction of a tubular film, and a transport conveyor device that transports a package that is cut and formed by the top seal device.

  The present invention has high durability, can extend the life, and can cope with high speed.

It is a figure which shows a suitable example of the pillow packaging machine by which the top seal apparatus which concerns on this invention is mounted. It is a front view showing one suitable embodiment of a top seal device concerning the present invention. It is a side view of the top seal device. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a perspective view of the top seal device. It is a figure which shows the motor used as a top cutter and its drive source, (a) is a front view, (b) is a side view, (c) is a BB arrow directional cross-sectional view. It is a perspective view which shows the motor etc. which become a drive source of a top cutter. It is sectional drawing which shows the motor etc. which become a drive source of a top cutter. It is a perspective view which shows the motor etc. which become a drive source of a top cutter.

  FIG. 1 shows a schematic configuration of a pillow packaging machine as an example of a packaging machine on which a top seal device according to the present invention is mounted. The pillow wrapping machine is disposed on the upstream side of the packaging machine main body 1, the film supply device 2 for continuously supplying a belt-shaped packaging film to the packaging machine main body 1, and the packaging machine main body 1. 1 is provided with a packaged article conveying and supplying device 4 for supplying the packaged article 3 at a predetermined interval.

  The film supply device 2 links the output of a driving motor (not shown) such as a servo motor, which is not shown, to the original roll 6 obtained by winding the belt-like film 5 into a roll. Supplying to the packaging machine body 1 at a constant speed while appropriately controlling the rotation speed. Further, various rollers 7 (only one is shown in the figure as a representative) are arranged at predetermined positions from the original fabric roll 6 to the packaging machine body 1, and the belt-like film 5 fed out from the original fabric roll 6. Is guided to the packaging machine main body 1 through a predetermined path by being passed over the roller 7. In the present invention, it is not always necessary to link the drive motor to the original fabric roll 6, and a feed roller may be provided on the transport path of the packaging film and pulled out.

  The package transport / supply device 4 includes a sprocket 9 disposed at the front and rear, an endless chain 10 spanned by the plurality of sprockets 9, and a plurality of push fingers 11 attached to the endless chain 10 at a predetermined pitch. It consists of. Thereby, when the pushing finger 11 hits the rear surface of the article to be packaged 3, the article to be packaged 3 moves forward on the conveyance path as the pushing finger 11 moves.

  The packaging machine main body 1 is disposed on the downstream side of the bag making machine 15 for making the supplied belt-like film 5 into the cylindrical film 14, and the film polymerization end of the cylindrical film 14 is moved in the traveling direction. A center seal device 17 that heat-seals along the belt, a belt conveyor 16 that is disposed on the downstream side of the center seal device 17 and conveys the tubular film 14 that encloses the article 3 to be packaged, and a predetermined position above the belt conveyor 16 The upper restraint belt 18 disposed on the belt conveyor 16, the top seal device 20 disposed on the downstream side of the belt conveyor 16, and the transport conveyor device 19 disposed on the downstream side of the top seal device 20.

  The bag making device 15 allows the side film edges 5a of the belt-like film 5 to contact (polymerize) with each other by passing the belt-like film 5 continuously supplied from the film supply device 2, and the tube that has become cylindrical. Bag-like film 14 is made. In addition, the articles to be packaged 3 that are sequentially supplied from the article to be packaged conveyance supply device 4 to the packaging machine body 1 are inserted into the bag making machine 15. Thereby, the to-be-packaged goods 3 supplied to the bag making machine 15 are arrange | positioned in the cylindrical film 14 for every predetermined space | interval.

  The center sealing device 17 seals both side edge portions 5a of the polymerized belt-like film 5. The center seal device 17 heat-seal by heating while sandwiching the side edge portions 5a of the belt-like film 5 from both sides.

  The upper restraining belt 18 is disposed in the immediate vicinity of the upstream side of the top seal device 20, and suppresses the article 3 in the tubular film 14 from being lifted upward so that it can be conveyed while maintaining a horizontal state. ing.

  The top seal device 20 seals and cuts the tubular film 14 in a direction orthogonal to the traveling direction, that is, in a transverse direction. The top seal device 20 of the present embodiment is of a so-called box motion type, and a pair of upper and lower top sealers 21 and 22 arranged vertically are in a state where the seal surfaces 21a and 22a face each other. A drive mechanism is provided for revolving along a predetermined trajectory while maintaining. Both the top sealers 21 and 22 operated by this drive mechanism move toward each other from a reference position separated by a predetermined distance, and sandwich the tubular film 14 from above and below, so that the film portions that are in contact with the sealing surfaces 21a and 22a are located. Pressurize at a predetermined pressure and heat. Both the top sealers 21 and 22 move forward along the moving direction of the tubular film 14 while maintaining the state in which the tubular films 14 are held close to each other as described above. The moving speed at this time is equal to the moving speed of the tubular film 14. Both the top sealers 21 and 22 move away from each other when moved by a predetermined distance, and move in the direction opposite to the moving direction of the tubular film 14 to reach the reference position.

  Both top sealers 21 and 22 are attached to an upper sealer mount 23 and a lower sealer mount 24, respectively. That is, the lower top sealer 22 is fixed to the upper surface of the lower sealer mount 24 and moves together with the lower sealer mount 24. The upper top sealer 21 is attached to the lower surface of the upper sealer mounting base 23 via a moving base 25 so as to be movable up and down. A plurality of guide rods 26 are formed upright on the upper surface of the movable table 25, and these guide rods 26 are inserted into vertically penetrating holes provided in the upper sealer mounting table 23. As the guide rod 26 reciprocates along the axial direction in the through-hole, the guide rod 26 and consequently the moving table 25 and the upper top sealer 21 also move up and down. Further, the tip (upper end) of the guide rod 26 is attached to the upper sealer mount 23 so as not to move downward by a certain distance or more by an appropriate mechanism / structure. As a result, the moving base 25 and the upper top sealer 21 are prevented from being separated from the upper sealer mounting base 23 and falling. Furthermore, a coil spring 27 is attached to the predetermined guide rod 26, and the movable table 25 and thus the upper top sealer 21 are urged downward by the elastic restoring force of the coil spring 27. Thus, when the upper top sealer 21 is urged upward by an external force, the upper top sealer 21 moves upward while compressing and deforming the coil spring 27. When the upward urging force is eliminated, the upper top sealer 21 smoothly moves downward due to the elastic restoring force of the coil spring 27 in addition to the weight of the upper top sealer 21 and the like.

  Cam followers 28 are arranged on both side surfaces of the upper sealer mount 23 and the lower sealer mount 24 so as to protrude outward. The cam follower 28 matches a groove cam provided on a cam plate attached to the inner surface of the machine frame having a substantially rectangular shape surrounding the cylindrical film 14 (not shown) as a basic structure. The above-mentioned revolution movement is performed according to the shape of the cam. In addition, since the structure which revolves both the top sealers 21 and 22 using such a cam mechanism is a conventionally well-known thing, the detailed description is abbreviate | omitted. Also, instead of using cams in this way, a plurality of drive motors are provided, such as a drive motor for moving both the top sealers 21 and 22 up and down and a drive motor for moving forward and backward. The top sealers 21 and 22 may be revolved by operating at an appropriate timing.

  Further, by appropriately setting the shape of the groove cam of the cam plate, the upper and lower top sealers 21 and 22 are maintained in a state where the seal surfaces 21a and 22a are in contact with each other for a certain period of time. The lower top sealer 22 urges the upper top sealer 21 upward and compresses and deforms the coil spring 27 when the seal surfaces 21a and 22a come into contact with each other. As a result, the top sealers 21 and 22 receive the force such as the elastic restoring force of the coil spring 27 and sandwich the tubular film 14 with a predetermined pressure, and heat seal.

  A through hole extending in the vertical direction is provided at the center of the seal surfaces 21a and 22a of the upper top sealer 21, respectively. And the top cutter 30 is arrange | positioned in the through-hole 21b provided in the upper side top sealer 21 so that an up-down movement is possible. The top cutter 30 has a serrated blade portion 30a at the lower end. The top cutter 30 moves up and down in response to a force from a drive source attached to the upper surface of the upper sealer mount 23. And when the top cutter 30 comes to the lowest position, the blade part 30a protrudes below rather than the sealing surface 21a.

  The film part sealed by both the top sealers 21 and 22 is a predetermined position between the front and rear packages 3. And the blade part 30a of the top cutter 30 which protruded below from the sealing surface 21a of the upper side top sealer 21 cuts a film part to the horizontal direction in the front-back direction intermediate part of the film part pinched | interposed with both the top sealers 21 and 22. In connection with this, the head part of the cylindrical film 14 is isolate | separated from the subsequent, and the package 12 is manufactured.

  On the other hand, the through hole 22 b provided in the lower top sealer 22 is provided at a position facing the through hole 21 b of the upper top sealer 21. Thereby, the blade part 30a protruding downward enters the through hole 22b of the lower top sealer 22, and the tubular film 14 sandwiched between the top sealers 21 and 22 extends along the blade part 30a. Cut horizontally.

  Further, the drive mechanism of the top cutter 30 will be described. As shown in FIG. 4, through holes 25 a and 23 b are respectively provided in the moving base 25 and the upper sealer mounting base 23 so as to face the through holes 21 b formed in the upper top sealer 21. These through holes 21b, 25a, and 23b are located on the same plane, and the top cutter 30 is inserted into the through holes 21b, 25a, and 23b so as to be movable up and down.

  The top cutter 30 is connected to the cutter holder 32 at the upper end thereof. The lower surface of the cutter holder 32 is provided with a first guide pin 33 and a second guide pin 34 that extend downward in parallel with the top cutter 30. The first guide pin 33 and the second guide pin 34 are inserted into a guide hole 23 c provided in the upper sealer mount 23. Accordingly, the first guide pin 33 and the second guide pin 34 move up and down in the guide hole 23c, so that the top cutter 30 can move up and down stably. Further, a cutter return spring 35 is mounted concentrically on the outer periphery of the second guide pin 34 disposed outside the cutter holder 32. The upper end of the cutter return spring 35 contacts the cutter holder 32, and the lower end of the cutter return spring 35 contacts the upper sealer mount 23.

  Thereby, when the drive source for the top cutter 30 urges the cutter holder 32 downward, the top cutter 30 also moves downward together with the cutter holder 32. At that time, the cutter return spring 35 is compressed and elastically deformed. When the downward urging force to the cutter holder 32 is released, the cutter holder 32 is urged upward by the elastic restoring force of the cutter return spring 35, and the cutter holder 32 and, consequently, the top cutter 30 are moved upward.

  As the drive source for the top cutter 30, a motor 40 in which the output shaft 46 linearly moves in the axial direction was used. The motor 40 may be referred to as an electromagnetic actuator. A specific configuration of the motor 40 is as follows.

  The housing 41 is configured by closing both end openings of a main body 42 based on a rectangular tube shape with both ends opened by an upper lid 43 and a bottom lid 44, respectively. The housing 41 is made of a nonmagnetic material. In this embodiment, lightweight and relatively strong aluminum is used. The outer peripheral surface of the main body 42 has a shape with four corners chamfered based on a rectangular parallelepiped, and the inner peripheral surface of the main body 42 has a shape in which a plurality of concave grooves 42a extending in the axial direction are formed on the inner peripheral wall surface of the virtual cylindrical shape. . The concave groove 42a is appropriately arranged in the circumferential direction. Thereby, the convex part 42b extended in an axial direction is formed between the concave groove 42a adjacent to the circumferential direction and the concave groove 42a. The tip of the convex portion 42b is located on the inner peripheral wall surface of the virtual cylinder.

  On the other hand, through holes 43a and 44a are formed at the center positions of the upper lid 43 and the bottom lid 44, respectively. And the bearing 45 is mounted | worn in each through-hole 43a, 44a. The bearing 45 includes a flange portion that extends outward at one end of a cylindrical main body. The bearing 45 is made of a material having a low frictional resistance, and is manufactured using a resin in this embodiment.

  Both ends of the output shaft 46 of the motor 40 are supported by bearings 45 so as to be movable in the axial direction. Since the bearing 45 is made of resin, the frictional resistance between the bearing 45 and the output shaft 46 generated when the output shaft 46 moves in the axial direction is small, and the output shaft 46 reciprocates smoothly along the axial direction. . Further, both ends of the output shaft 46 respectively penetrate the through holes 43a and 44a and protrude to the outside.

  The housing 41 is fixed to the upper surface of the base plate 47. That is, the bottom cover 44 of the housing 41 is installed on the base plate 47. A through hole 47 a is formed in the base plate 47 at a position facing the through hole 44 a of the bottom cover 44, and the tip of the output shaft 46 on the bottom cover 44 side also enters the through hole 47 a of the base plate 47. Deploy.

  The base plate 47 is fixed to the upper sealer mount 23 via the connecting member 55. As shown in FIG. 5 and the like, the connecting member 55 is connected to both ends of the base plate 47. Thus, by supporting the base plate 47 on both sides, the base plate 47 can be firmly fixed, and the motor 40 can be stably held even when the upper top sealer is moved up and down at high speed. With the motor 40 fixed to the upper sealer mount 23 in this way, the tip of the output shaft 46 of the motor 40 is linked to the cutter holder 32. Thereby, the output shaft 46 stands up. Therefore, the reciprocating motion along the axial direction of the output shaft 46 is a vertical movement, and the output shaft 46 and the cutter holder 32 and the top cutter 30 move up and down together.

  On the other hand, a permanent magnet 48 is mounted on the outer periphery of the output shaft 46, and the output shaft 46 and the permanent magnet 48 move together. The permanent magnet 48 is cylindrical, magnetized in the axial direction, and has one end face in the axial direction having an S pole and the other end face having an N pole. In this embodiment, a neodymium magnet having a strong magnetic force is used. Further, three permanent magnets 48 are arranged in the axial direction so that the poles of the adjacent facing surfaces are the same. As a result, the magnetic flux emitted from the end face of each permanent magnet 48 repels the magnetic flux produced from the adjacent opposing end face, and is output toward the outside of the permanent magnet 48. That is, the magnetic flux is output so as to spread radially outward on a plane parallel to the end face of the permanent magnet 48.

  Furthermore, in this embodiment, the washer 49 is arrange | positioned between the end surfaces of the adjacent permanent magnet 48 and the outer end surface of the permanent magnet 48 which is both ends of an axial direction. The washer 49 defines the distance between adjacent permanent magnets 48. Further, the washer 49 uses a magnetic material. The magnetic material is, for example, iron or mild steel. As a result, the washer 49 forms a magnetic path, and the magnetic flux output from the end face of the permanent magnet 48 travels through the washer 49 having a small magnetic resistance, and is output to the outside from the side surface of the peripheral edge of the washer 49. The magnetic flux output from the permanent magnet 48 travels outward from the outer peripheral side surface of the washer 49 within a plane orthogonal to the axial direction of the output shaft 46.

  On the other hand, an electromagnet 50 is disposed on the inner peripheral surface of the main body 42 of the housing 41. The electromagnet 50 generates a magnetic field by attaching a coil winding 52 to a coil bobbin 51 and energizing the coil winding 52 in conjunction with a power source (not shown). The rating of the power source for energizing the coil winding 52 is, for example, 24V40A.

  The coil bobbin 51 is made of a nonmagnetic material, and aluminum is used in this embodiment. The coil bobbin 51 has a flange portion 51b protruding outward on the outer peripheral surface of the cylindrical winding portion 51a. Three flange portions 51b are provided at appropriate intervals in the axial direction. The output shaft 46 and the permanent magnet 48 are inserted and arranged in the internal space of the winding part 51a. The outer diameter of the permanent magnet 48 is slightly smaller than the inner diameter of the winding portion 51a, and the permanent magnet 48 and the winding portion 51a are not in contact with each other. Therefore, when the output shaft 46 reciprocates, there is no contact resistance from the coil bobbin 51 side, and smooth movement is ensured.

  Further, the space between the adjacent flange portions 51b is a region where the coil windings 52 are arranged. Therefore, two areas for arranging the coil winding 52 are formed in the axial direction. The two coil windings 52 arranged in the axial direction are reversely wound. As a result, when the two coil windings 52 are energized, a magnetic field parallel to the axial direction and opposite in direction is generated. Therefore, by appropriately setting the energization direction, the magnetic flux generated by the coil winding 52 and the magnetic flux generated from the permanent magnet 48 are repelled or attracted to move the permanent magnet 48 to a stable position. Accordingly, the motor 40 is configured in which the electromagnet 50 side is a stator and the permanent magnet 48 and the output shaft 46 side are movers.

  In the present embodiment, as shown in FIG. 8 and the like, the tip on the upper lid 43 side of the output shaft 46 protrudes relatively larger than the upper lid 43, and the boundary position between the adjacent permanent magnets 48 and the adjacent coil winding 52. A position where the boundary position is slightly displaced becomes a standby state. In this standby state, the cutter holder 32 is located at the raised position, and the top cutter 30 is housed in the upper top sealer 21. This state is maintained by raising the cutter holder 32 by the elastic restoring force of the cutter return spring 35 without energizing the coil winding 52.

  On the other hand, when the coil winding 52 is energized in a predetermined direction from this state, a downward urging force acts on the permanent magnet 48 and the output shaft 46 that are the movers, and the top cutter 30 is moved accordingly. Also moves downward to cut the tubular film 14. When energization of the coil winding 52 is stopped, the magnetic field generated by the electromagnet 50 is lost, and the downward urging force of the output shaft 46 by the motor 40 disappears. Therefore, the top cutter 30 returns to the original standby position by the elastic restoring force of the cutter return spring 35.

  Thus, in the present embodiment, the motor 40 is used as a drive source for moving the top cutter 30 downward, and the upward movement of the top cutter 30 uses the elastic restoring force of the cutter return spring 35. Therefore, energization of the coil winding 52 only needs to control ON / OFF in one direction, and the control becomes easy. In addition, since energization for ascending is unnecessary, the total energization time is shortened, which is suitable for energy saving.

  By the way, although the coil winding 52 is energized in a relatively short time, the coil winding 52 is coupled with the reciprocating movement of the output shaft 46 relatively fast, for example, 200 to 400 times per minute. As a result, the current value flowing to the surface also increases, resulting in a new problem of increased heat generation. Therefore, in this embodiment, a heat dissipation structure is provided. First, as described above, by forming the concave groove 42a on the inner peripheral surface of the main body 42 of the housing 41, a passage for releasing heat generated from the coil winding 52 was secured. Furthermore, by providing the above-described concave groove 42a, a large number of convex portions 42b are formed, and the convex portions 42b exhibit the function of heat radiating fins. The housing 41 and the coil bobbin 51 are made of aluminum, have good heat conduction, and can efficiently radiate the space in the housing 41 to the outside.

  Furthermore, in the present embodiment, a collar 56 is disposed between the axial end faces of the electromagnet 50 and the upper lid 43 and the bottom lid 44 in the internal space of the housing 41 to restrict the axial position of the electromagnet 50. The collar 56 is also formed of a material having good thermal conductivity such as aluminum, and is provided with irregularities on the surface so as to exhibit functions and effects like a heat sink.

  The above-described configuration uses natural heat dissipation, but in this embodiment, a forced air cooling mechanism is also provided. Specifically, the hole 42 c is formed on the opposite side surface of the main body 42 of the housing 41. The hole 42c constitutes an exhaust port with the air cooling air inlet. Specifically, a supply pipe and an exhaust pipe (not shown) are connected to the hole 42c. Air is forcibly introduced into the housing 41 from the supply pipe, the temperature of the internal space of the housing 41 is lowered by the introduced air, and the warm air is discharged outside through the exhaust pipe. Thereby, coupled with the natural heat dissipation effect described above, the temperature rise of the motor 40 can be suppressed and stable operation can be performed.

  For example, the air supplied to the supply pipe may be compressed air output from compressed air equipment installed in a factory or the like. In this case, in order to enhance the cooling effect, it is better to increase the flow velocity than to increase the pressure of the introduced air. Therefore, it is preferable to mix the compressed air and the surrounding air and introduce the increased air from the supply pipe.

  Further, for example, a thermocouple may be attached to the coil winding 52 and the like, the temperature may be monitored, and the forced air cooling mechanism may be controlled based on the monitored temperature. For example, at the beginning of operation or when the monitored temperature is low below the reference value, the air supply is stopped and forced air cooling is not performed, and the temperature rise is suppressed by natural heat dissipation, and the temperature exceeds the reference value. Air supply may be started to perform forced air cooling. In addition, the control may not be on / off of forced air cooling, but may adjust the supply amount of air according to the temperature.

  Furthermore, in this embodiment, since the motor is driven only for the downward movement of the top sealer, the ratio of the energization time to the entire operation time is reduced. Thus, the effect of suppressing the temperature rise is also exhibited by shortening the energization time and securing the non-energization time.

  Moreover, in this embodiment, since various members, such as the housing 41, are made of aluminum, the strength is exhibited while achieving weight reduction. By reducing the weight, even when installed on the upper sealer mount 23, it can be stably held. Further, in the above-described embodiment, the base plate 47 is supported at both ends, but may be cantilevered.

  Further, in the above-described embodiment, the output of the motor 40 is used for the downward movement of the upper top sealer, and the spring is used when it is raised. You may make it utilize the output of a motor. Also, for example, the motor is placed horizontally so that the axial direction of the output shaft is orthogonal to the protruding direction of the top cutter, and the cam roller linked to the top cutter is pushed down by an inclined cam provided at the tip of the output shaft. Thus, the top cutter can be biased.

DESCRIPTION OF SYMBOLS 1 Packing machine main body 2 Film supply apparatus 3 Packaged object 4 Packaged article conveyance supply apparatus 5 Band-shaped film 12 Package 14 Cylindrical film 15 Bag making machine 17 Center seal apparatus 20 Top seal apparatus 21 Upper top sealer 22 Lower top sealer 23 Upper sealer mounting base 24 Lower sealer mounting base 30 Top cutter 30a Blade part 32 Cutter holder 35 Cutter return spring 40 Motor 41 Housing 42 Main body 42a Concave groove 42b Convex part 42c Hole part 43 Upper lid 43a Through hole 44 Bottom lid 44a Through Hole 46 Output shaft 48 Permanent magnet 49 Washer 50 Electromagnet 51 Coil bobbin 51a Winding part 51b Flange part 52 Coil winding

Claims (9)

A top seal device that seals and cuts a packaging film that encloses an article to be packaged in the lateral direction of the packaging film,
A pair of top sealers disposed across the packaging film;
A drive mechanism for moving the pair of top sealers closer to and away from each other while maintaining a state in which the seal surfaces of the pair of top sealers are opposed to each other;
A top cutter disposed on at least one of the pair of top sealers so as to be movable in the approaching and separating direction within the top sealer; and
With
Using a motor in which an output shaft linearly moves in the axial direction as a driving source for biasing the top cutter in a direction in which the blade portion at the tip of the top cutter protrudes from the seal surface, the biasing is performed based on the movement of the output shaft. A top sealing device characterized in that   The top seal device according to claim 1, wherein the movement in a direction in which the top cutter protruding from the seal surface is accommodated in the top sealer uses an elastic restoring force of a spring. The motor includes a plurality of permanent magnets attached to the output shaft, and an electromagnet disposed on the outer periphery of the permanent magnets.
The magnetization directions of the plurality of permanent magnets are parallel to the axial direction of the output shaft, and the magnetization directions of the adjacent permanent magnets are opposite to each other,
The top seal device according to claim 1, wherein the electromagnet includes a plurality of coil windings arranged in the axial direction, and the adjacent coil windings are formed in a reverse winding.   The top seal device according to claim 3, wherein a magnetic body is disposed between opposing end surfaces of the adjacent permanent magnets.   The top seal device according to claim 3, wherein the motor includes a heat dissipation structure.   The top seal device according to any one of claims 3 to 5, wherein a plurality of grooves extending in the axial direction are formed on an inner peripheral surface of a housing that houses the electromagnet.   The top seal device according to claim 6, wherein the housing is formed of a member having good thermal conductivity. The electromagnet is configured by mounting the coil winding on a coil bobbin,
The top seal device according to any one of claims 3 to 7, wherein the coil bobbin is made of a member that is nonmagnetic and has good thermal conductivity.   The top seal device according to any one of claims 1 to 8, further comprising a forced air cooling mechanism for supplying a cooling gas to the motor.

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