JP5513089B2 - Heat sealer - Google Patents

Description

  In the present invention, a film-like object to be sealed in which holes are formed is sandwiched between a first pressure contact portion and a second pressure contact portion in a state where the film is bent along a line passing through the holes, and the periphery of the holes is heated by a heater. The present invention relates to a heat sealer for heat welding.

  A handy sealer disclosed in the following Patent Document 1 is known as a heat sealer in which an object to be sealed is sandwiched between a first pressure contact part and a second pressure contact part, and the object to be sealed is thermally welded by heat from a heater. The sealed object is usually formed in a bag shape, and after the contents are stored in the bag, the opening is thermally welded by a heat sealer. Therefore, the shape of the seal portion is linear, and the heater is also formed linear.

JP 2009-132449 A

  On the other hand, there is an object to be sealed other than a form that seals the opening of a normal bag. For example, FIG. 7 shows a film-like sheet W (a material to be sealed) that is put on a field fence, and a small hole Wa is formed at predetermined intervals. Such a sheet W is covered to prevent grass from growing, and a soil disinfectant is injected from the hole Wa with a syringe. After injecting the soil disinfectant, it is necessary to close the hole Wa in order to disinfect the soil efficiently. It is possible to seal the periphery of the hole Wa using the heat sealer disclosed in the above prior art, but the area to be sealed is too large compared to the size of the hole Wa, and useless energy is input. become.

  This invention is made | formed in view of the said situation, The subject is providing the heat sealer which can seal the circumference | surroundings of the hole of the film-like to-be-sealed thing in which the hole was formed efficiently.

In order to solve the above problems, the heat sealer according to the present invention is:
A film-like object to be sealed in which holes are formed is sandwiched between a first pressure contact portion and a second pressure contact portion in a state where the film is bent along a line passing through the holes, and the periphery of the holes is thermally welded by heat from the heater. The heat sealer of
The heater is arranged in any one of the first pressure contact portion and the second pressure contact portion, and is formed in a U shape so as to surround the hole.

  The operation and effect of the heat sealer having such a configuration will be described. The procedure in the case of sealing the hole formed in the film sheet illustrated in FIG. 7 will be described. As shown in FIG. 8A, the sheet is folded in two along a line L passing through the hole. The bent state is shown in FIG. The area to be folded only needs to be around the hole. The periphery of the hole is sandwiched between the first press contact portion and the second press contact portion. After being sandwiched, heat welding is performed by a heater, and the shape of the heater is U-shaped so as to surround the hole. Accordingly, the portion to be thermally welded is set so as to surround the hole as indicated by S in FIG. Thereby, a hole can be closed substantially. In this way, only the minimum necessary area around the hole is thermally welded, so that energy is not wasted and a sealing operation can be performed in a short time. As a result, it is possible to provide a heat sealer that can efficiently seal the periphery of the hole of the film-like object to be sealed in which the hole is formed.

  The heater according to the present invention is preferably a linear heater having a circular cross section. By using a linear heater having a circular cross section, only a necessary region can be efficiently thermally welded and sealed. Also, the heater can be easily processed.

  The heater according to the present invention is disposed inside an end portion of the first press contact portion or the second press contact portion, and a grip margin for the sealed object is formed between the heater and the end portion. Is preferred.

  If the heater is located at the end of the press contact portion, the heater may melt the object to be sealed due to the press contact force and heating. Therefore, if a grip margin is formed around the heater, the fusing can be prevented.

It is the top view which showed the structural example of the heat sealer which concerns on one Embodiment of this invention. It is AA sectional drawing of the heat sealer of FIG. Enlarged side view showing the configuration of the pressure contact part Plan view showing the configuration of the heater It is sectional drawing of a heat sealer, and has shown the state which pulled the operation lever from the state of FIG. It is sectional drawing of a heat sealer, and has shown the state which pulled the operation lever further from the state of FIG. It is the block diagram which showed an example of the electrical constitution of a heat sealer. It is the flowchart which showed an example of the control which a control board performs with operation of an operation lever. Diagram showing an example of an object to be sealed The figure which shows a mode when sealing the circumference | surroundings of the hole of a to-be-sealed object The figure which shows another embodiment of the heat welding by a U-shaped heater The figure which shows another embodiment of a heater

  A preferred embodiment of a heat sealer according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a configuration example of a heat sealer 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the heat sealer 1 of FIG. FIG. 2A is an enlarged side view showing the pressure contact portion. FIG. 2B shows an enlarged plan view of the heater. FIG. 3 is a sectional view of the heat sealer 1 and shows a state in which the operation lever 3 is pulled from the state of FIG. FIG. 4 is a cross-sectional view of the heat sealer 1 and shows a state where the operation lever 3 is further pulled from the state of FIG.

  The heat sealer 1 includes a sealer body 2 and an operation lever 3, and can be used by simultaneously holding the sealer body 2 and the operation lever 3 with one hand H as shown by a two-dot chain line in FIG. Such a handy type heat sealer.

  The sealer body 2 is formed in an elongated shape, and an operation lever 3 is attached to a central portion in the longitudinal direction of the sealer body 2 via a movable member 6 and a connecting member 7. The movable member 6 is rotatably attached to the sealer body 2 around a support shaft 6a formed at one end thereof, and one end of the object to be sealed is attached to the other end of the movable member 6. A first pressure contact portion 4 that is pressed against the surface is held. In addition, a second press-contact portion 5 that is pressed against the other surface of the object to be sealed is held at one end of the sealer body 2.

  The first press contact portion 4 and the second press contact portion 5 extend in a direction orthogonal to the longitudinal direction of the sealer body 2 and are attached in parallel to each other. As shown in FIG. 2A, the first pressure contact portion 4 includes a pressure contact main body portion 40 integrally coupled to the movable member 6 and a pressure contact rubber 41 attached to the surface of the pressure contact main body portion 40. The pressure contact main body 40 is made of a metal such as aluminum, the pressure contact rubber 41 is formed of an elastic material such as silicon rubber, and the surface functions as a pressure contact surface 4 a for the object to be sealed of the first pressure contact portion 4.

  The second press-contact portion 5 is provided with a press-contact main body portion 50 and a protective cover 14 having a U-shaped cross section in a side view on the outer peripheral surface opposite to the press-contact surface 5a for the object to be sealed. The surface on the pressure contact surface 5 a side of the pressure contact main body 50 is covered with an insulating sheet 51 and the surface thereof is covered with a first resin sheet 52. The heater 13 is provided on the surface of the first resin sheet 52, and the surface is further covered with the second resin sheet 53. The surface of the second resin sheet 53 functions as a pressure contact surface 5a against the object to be sealed. The first and second resin sheets 52 and 53 are formed of a resin sheet in which a glass fiber is impregnated with a fluororesin.

  As shown in FIG. 2B, the heater 13 has a U shape in plan view. The heater 13 is formed of a metal material such as a piano wire and has a circular cross-sectional shape. For example, a wire having a diameter of φ0.45 mm is used, but the size of the diameter can be appropriately changed according to the purpose. The heater 13 is disposed slightly inside the end portion 5 c of the second press-contact portion 5, and a grip allowance 5 b is formed between the end portion 5 c and the heater 13. By heating the heater 13, a resin film as an example of an object to be sealed is thermally welded, but it is necessary to prevent the film from being melted. In particular, since the heater 13 is formed of a wire rod, the stress during heating increases, and if the heater 13 is disposed at the end, a large shearing force may act. Therefore, as shown in FIG. 2B, by providing the gripping allowance 5b, a predetermined area around the heater 13 can be pressed and the object to be sealed can be prevented from being blown by the action of a large shearing force.

  A pair of first terminals 54 are provided at both ends of the heater 13, and the heater 13 is pressed to make electrical and mechanical connections. Further, the second terminal 55 is sandwiched at the same position as the first terminal 54 and the lead wire 56 is connected. The lead wire 56 is connected to a heating circuit (not shown), whereby the drive control for the heater 13 can be performed. The first terminal 54 and the second terminal 55 are integrally coupled to the press-contact main body 50 by screws.

  The operation lever 3 is formed in a curved shape so that the user can easily hold it with a finger, and is attached to the movable member 6 by a support shaft 3b formed at one end thereof. Further, a support shaft 3 a that connects the operation lever 3 to the connecting member 7 so as to be rotatable is formed at a position closer to the center than the support shaft 3 b in the operation lever 3. The connecting member 7 is a rod-like member extending in a straight line, and is rotatably connected to the operation lever 3 via the support shaft 3a at one end thereof, and the sealer via the support shaft 7a at the other end. The main body 2 is rotatably connected.

  One end of a tension spring 9 as a first biasing member is attached between the support shaft 3b and the support shaft 6a of the movable member 6, and the other end of the tension spring 9 is a support shaft in the sealer body 2. It is attached between 6a and the support shaft 7a. Accordingly, the movable member 6 is biased in a direction in which the first press contact portion 4 is separated from the second press contact portion 5 by the biasing force of the tension spring 9.

  A grip portion 2a is formed at the end of the sealer body 2 opposite to the end to which the second press-contact portion 5 is attached. The grip 2a is formed by a recess corresponding to the shape of the hand H when gripped. When the heat sealer 1 is used, as shown by a two-dot chain line in FIG. 2, the user brings the palm of one hand H into contact with the grip 2a of the sealer body 2 and the thumb with the grip 2a. The heat sealer 1 can be gripped by contacting the tip of the other four fingers with the grip 3c of the operation lever 3.

  In this state, if the operating lever 3 is pulled toward the sealer body 2 by the gripping force of the hand H, the operating lever 3 rotates counterclockwise in FIG. 2 about the support shaft 3a, and the connecting member 7 is connected to the support shaft 7a. 2 rotates in the clockwise direction in FIG. 2, and the movable member 6 rotates in the clockwise direction in FIG. 2 around the support shaft 6a against the urging force of the tension spring 9. As a result, as shown in FIG. 3, the first press contact portion 4 attached to the movable member 6 is relatively moved in the direction approaching the second press contact portion 5, and the first press contact portion 4 and the second press contact portion are moved. The object to be sealed W can be sandwiched between 5.

  The 2nd press-contact part 5 is attached with respect to the sealer main body 2 so that a displacement in the direction of arrow B is possible. The direction of the arrow B is a direction in which the second press contact portion 5 approaches or separates while maintaining a parallel state with respect to the first press contact portion. As shown in FIG. 1, two compression springs 8 extending along the arrow B are attached to the second pressure contact portion 5. These compression springs 8 are second urging members that urge the second pressure contact portion 5 along the arrow B toward the first pressure contact portion 4.

  Note that one compression spring 8 may be provided at the center in the longitudinal direction of the second press-contact portion 5, or two compression springs 8 may be provided at both ends in the longitudinal direction of the second press-contact portion 5. Further, the number of the compression springs 8 is not limited to two, but may be one, or may be three or more, but they are arranged symmetrically with respect to the center line AA of the heat sealer 1. Is preferred.

  The compression spring 8 is disposed between the inner surface of the protective cover 14 and the surface opposite to the pressure contact surface 5 a of the pressure contact main body 50. Screws 14 a are provided at two left and right positions in front view so as to penetrate the U-shaped protective cover 14, and the screws 14 a are passed through the long holes 50 a formed in the press-contact main body 50. The screw 14a and the long hole 50a function as a guide mechanism when the press-contact main body 50 moves in the arrow B direction.

  When the operation lever 3 is further pulled toward the sealer body 2 side by the gripping force of the hand H from the state of FIG. 3, the operation lever 3 further rotates counterclockwise in FIG. The member 7 further rotates clockwise around the support shaft 7a in FIG. At this time, the movable member 6 further rotates in the clockwise direction in FIG. 3 around the support shaft 6 a against the urging force of the tension spring 9, and the second pressing portion 5 is pressed by the pressing force of the first pressing portion 4. As shown in FIG. 4, the second pressure contact portion 5 is displaced along the direction of arrow B against the urging force of the compression spring 8.

  In this state, a pressing state in which a greater pressing force acts between the first press contact portion 4 and the second press contact portion 5 due to the biasing force of the compression spring 8 is obtained. Therefore, by energizing the heater 13 in this state, the object to be sealed W sandwiched between the first pressure contact portion 4 and the second pressure contact portion 5 can be favorably heat-welded by the heat from the heater 13. .

  In the present embodiment, the movable member 6 and the connecting member 7 connected to the operation lever 3 increase the operating force on the operation lever 3 to apply a pressing force between the first pressure contact portion 4 and the second pressure contact portion 5. A booster mechanism 20 is configured. More specifically, the operation lever 3 is rotatable about a support shaft 3a (first fulcrum), and a support shaft 3b (operation point) that is a connecting portion between the operation lever 3 and the movable member 6 and the support shaft 3a. Is formed shorter than the length of the grip portion 3c extending to the opposite side of the support shaft 3b with respect to the support shaft 3a.

  According to such a configuration, the operating lever 3 can be operated by gripping the grip portion 3c that is longer than the distance to the support shaft 3b with respect to the support shaft 3a. As a result, an operating force can be applied to the grip portion 3c at a position away from the support shaft 3a on the opposite side of the distance to the support shaft 3b. An acting force can be obtained. Therefore, the movable member 6 can be displaced with a smaller operating force, and the first pressure contact portion 4 can be pressed against the second pressure contact portion 5 with a larger pressing force.

  Thus, by providing the booster mechanism 20, the operating force is increased by the booster mechanism 20 by operating the operating lever 3 while holding the sealer body 2 and the operating lever 3 simultaneously with one hand. A pressing force can be applied between the first press contact portion 4 and the second press contact portion 5. In a state where the sealer body 2 and the operation lever 3 are held with one hand, it is difficult to apply a large operating force to the operation lever 3 as compared with a heat sealer used with the sealer body installed on the installation surface. However, as in the present embodiment, by increasing the operating force by the booster mechanism 20, it is possible to easily obtain the pressing force necessary to satisfactorily thermally weld the article to be sealed W. Therefore, a large pressing force can be applied between the first press contact portion 4 and the second press contact portion 5 with a smaller operating force.

  In the present embodiment, based on the operation of the operation lever 3, the operation lever 3 rotates around the support shaft 3a (first fulcrum), and the connecting member 7 connected to the support shaft 3a includes the sealer. It rotates around a support shaft 7a (second fulcrum) which is a connecting portion with the main body 2. Accordingly, as shown in FIGS. 2 to 4, the support shaft 3 a can be displaced based on the operation of the operation lever 3, so that the movable range of the operation lever 3 defined by the position of the support shaft 3 a is operated. Can be set in a range that is easy to perform, and the operability is further improved.

  In the present embodiment, when the operation lever 3 is not operated, the movable member 6 is urged by the tension spring 9 in a direction to separate the first press contact portion 4 from the second press contact portion 5 as shown in FIG. The Therefore, in this state, the object to be sealed W is arranged in the space formed between the first pressure contact portion 4 and the second pressure contact portion 5, and then the operation lever 3 is operated to operate the first pressure contact portion 4 and the second pressure contact portion. The object to be sealed can be easily heat-welded by sandwiching the object to be sealed W between the portions 5.

  In the pressed state shown in FIG. 4, the straight line C connecting the support shaft 3 a and the support shaft 3 b is parallel to the direction in which the tension spring 9 extends, so that the urging force is applied in the direction in which the operation lever 3 is rotated. Almost no longer works. Therefore, in the pressed state, it is possible to maintain the pressed state without applying too much operating force to the operation lever 3, so that a large operating force is applied between the first press contact portion 4 and the second press contact portion 5 with a smaller operating force. A pressing force can be applied.

  Furthermore, in the pressing state shown in FIG. 4, a greater pressing force can be applied between the first press contact portion 4 and the second press contact portion 5 by the urging force of the compression spring 8, so that the sealed object W is better. Can be heat-welded. Even when the compression spring 8 is provided in this way, in the pressed state, the straight line C connecting the support shaft 3a and the support shaft 3b becomes parallel to the direction in which the tension spring 9 extends, so that the operation lever 3 Since the urging force hardly acts in the direction in which the lever is rotated, it is possible to maintain the pressing state without applying a very large operation force to the operation lever 3. Accordingly, the object to be sealed W can be thermally welded with a smaller operating force.

  In addition to the above configuration, the sealer body 2 includes a control board 10, a micro switch 11, a thermocouple 12, an energizing lamp 16, and the like. A control circuit including a CPU (Central Processing Unit) is formed on the control board 10. The micro switch 11 is an operation detection unit for detecting the operation of the operation lever 3, and when the operation lever 3 is operated to be in the pressing state shown in FIG. 3d contacts the microswitch 11, and a detection signal is output.

  An opening 2b is formed in the wall surface of the sealer body 2 that faces the microswitch 11, and in the pressed state shown in FIG. 4, the protruding portion 3d of the operation lever 3 passes through the opening 2b in the sealer body 2. , And comes into contact with the microswitch 11. The base part of the projecting part 3d functions as a stopper, and the base part of the projecting part 3d abuts on the peripheral part of the opening 2b in the pressed state shown in FIG. The sealer body 2 cannot be pulled further.

  The timer 12 has a function of measuring the energization time. In the present embodiment, the heater 13 is energized for a predetermined time (for example, 0.2 seconds) after the microswitch 11 is turned on. After a predetermined time has elapsed, the power supply to the heater 13 is automatically turned off. The energization time can be appropriately determined in consideration of the material of the object to be sealed W and the like. In addition, you may control by the thermocouple 18 which is demonstrated below instead of controlling with a timer.

  The thermocouple 18 is provided in the vicinity of the heater 13 in the second press-contact portion 5, and constitutes a temperature sensor that detects that the heat from the heater 13 has reached a predetermined temperature. The control board 10 functions as an energization control unit that controls the energization state of the heater 13 based on the detection of the predetermined temperature by the thermocouple 18. The energization lamp 16 is provided in the sealer body 2 and lights up while the heater 13 is energized to notify the user of the energized state.

<Control block diagram>
FIG. 5 is a block diagram showing an example of the electrical configuration of the heat sealer 1. As shown in FIG. 5, electrical components such as the above-described microswitch 11, thermocouple 12, heater 13, thermocouple 18, and energizing lamp 16 are electrically connected to the control board 10, and the power storage device 17. Is supplied to each electric component via the control board 10. As the power storage device 17, various power storage devices such as a primary battery and a secondary battery can be employed.

<Operation flowchart>
FIG. 6 is a flowchart illustrating an example of control performed by the control board 10 in accordance with the operation of the operation lever 3. When the user operates the operation lever 3 to be in the pressed state shown in FIG. 4, the object to be sealed W is sandwiched between the first pressure contact portion 4 and the second pressure contact portion 5 and is formed on the operation lever 3. When the protruding portion 3d touches the microswitch 11, a detection signal is output from the microswitch 11 (Yes in step S101), and energization of the heater 13 is started based on this detection signal (step S102).

  It should be noted that the sealed object W will be described with the sheet W placed on the field fence as described with reference to FIG. When sealing the hole Wa, as shown in FIG. 8A, the sheet W is folded in two along a line L passing through the hole Wa. The bent state is shown in FIG. The area to be bent only needs to be around the hole Wa. The periphery of the hole Wa is sandwiched between the first press contact portion 4 and the second press contact portion 5.

  According to the detection signal from the micro switch 11, the object to be sealed W sandwiched between the first press contact portion 4 and the second press contact portion 5 is heated by heat from the heater 13 and thermally welded. Thereafter, when the timer 12 detects that the predetermined time has elapsed (Yes in step S103), the power supply to the heater 13 is stopped (step S104). As a result, it is possible to supply only the minimum electric power necessary for thermally welding the object to be sealed W, and prevent the object to be sealed W from being heated more than necessary and breaking. Moreover, the shape heat-welded by the heater 13 is shown by the code | symbol S in FIG.8 (b). This shape corresponds to the U shape of the heater 13.

  By using the heater 13 as described above, the periphery of the hole Wa can be efficiently sealed. By sealing in a line shape, the minimum necessary region can be thermally welded, and the input energy can be suppressed to a minimum.

  In the handy type heat sealer 1 as in the present embodiment, it is possible to supply power to the heater 13 from the portable power storage device 17. When the power storage device 17 is used in this way, power consumption is achieved. If power consumption is not suppressed as much as possible, there is a problem that the power stored in the power storage device 17 is consumed in a short time, and the power storage device 17 must be frequently replaced or charged. Therefore, the above-described problem can be suppressed by adopting a configuration in which only the minimum necessary power is supplied as in this embodiment.

<Another embodiment of the heater>
FIG. 8B shows an example in which heat welding is performed using the entire U-shaped region of the U-shaped heater 13, but heat welding may be performed using only one corner of the U-shaped. The heat welding line in this case is indicated by the symbol S in FIG. In consideration of the shape, size, etc. of the hole, it can be sealed by a convenient method.

  FIG. 10 is a diagram showing another embodiment of the shape of the heater 13. In the present invention, when referring to a U-shape, not only a strict U-shape but only a general U-shape may be used. In FIG. 10A, the U-shaped corner is not round but rounded. The gate shape (or U-shape) as a whole is also included in the U-shape. (B) is close to the C-shape, but is also included in the U-shape. Although (c) is close to a V shape, this is also included in the U shape. (D) is a shape in which a U-shaped corner is chamfered, and this is also included in the U-shape. The technical significance of forming a U-shape is to seal so as to surround the hole, and any shape that exhibits this function is included in the concept of a U-shape. Various modifications can be considered.

  As an example of the object to be sealed, the film sheet placed on the ridge has been described, but the present invention is not limited to this. For example, when there is a hole in a sheet of a greenhouse, it can be used for the purpose of repairing the hole. In addition, it can be applied for various purposes to close the hole of the sheet-like material.

  In the present embodiment, the heater 13 is provided on the second pressure contact portion 5 side, but may be provided on the first pressure contact portion 4 side.

  In the above embodiment, the configuration in which the movable member 6 rotates about the support shaft 6a has been described. However, the present invention is not limited to such a configuration, and the movable member 6 may be configured to slide. Good.

  Further, the booster mechanism 20 is not limited to the configuration including the movable member 6 and the connecting member 7 as described above, but increases the operation force on the operation lever 3 to increase the first pressure contact portion 4 and the second pressure contact portion 5. Various other configurations can be adopted as long as the configuration provides a pressing force in between.

DESCRIPTION OF SYMBOLS 1 Heat sealer 2 Sealer main body 2a Grasp part 3 Operation lever 3a Support shaft 3b Support shaft 3c Grasp part 3d Protrusion part 4 Pressure contact part 4a Pressure contact surface 40 Pressure contact main body 41 Pressure contact rubber 5 Pressure contact part 5a Pressure contact surface 5b Grip allowance 5c End part 50 Pressure contact main body 51 Insulating sheet 52 First resin sheet 53 Second resin sheet 6 Movable member 6a Support shaft 7 Connecting member 7a Support shaft 10 Control board 11 Micro switch 12 Timer 13 Heater 17 Power storage device 20 Boosting mechanism W Sealed object

Claims (1)

A film-like object to be sealed in which holes are formed is sandwiched between a first pressure contact portion and a second pressure contact portion in a state where the film is bent along a line passing through the holes, and the periphery of the holes is thermally welded by heat from the heater. Handy type heat sealer,
The heater is disposed in one of the first pressure contact portion and the second pressure contact portion, and is formed in a U shape so as to surround the hole.
The heater is a linear heater having a circular cross section,
The heater is disposed inside an end portion of the first pressure contact portion or the second pressure contact portion, and a grip margin for the object to be sealed is formed between the heater and the end portion. The heat sealer is configured to press-contact a predetermined area around the heater.

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