JP6164525B2 - High frequency sewing machine - Google Patents

Description

  The present invention is intended for natural fibers represented by cotton, wool, silk, etc., or synthetic fabrics represented by polyester, nylon, acrylic, etc. (hereinafter referred to as “fiber fabric” in the present invention). By adhering (welding) the ends of the fiber fabric through a thermoplastic resin tape that is melted by high frequency dielectric heating, for example, apparel products such as women's clothing, children's clothing, men's clothing, etc. The present invention relates to a high-frequency sewing machine used for manufacturing and processing.

  A high-frequency sewing machine that manufactures and processes apparel products by bonding two fiber fabrics using high-frequency power and thermoplastic resin tape conveys a workpiece made of fiber fabric and thermoplastic resin tape in a specific direction along the horizontal plane ( Transfer means), a high-frequency power application device that applies high-frequency power between a pair of electrodes opposed to the upper and lower portions of the thermoplastic resin tape of the workpiece conveyed by the conveyance means, It is only necessary to provide a roller device composed of a pair of upper and lower rollers having a function of causing the adhesive of the thermoplastic resin tape melted by the dielectric heating accompanying the application to permeate into the fiber fabric. Needle thread (upper thread), looper thread For example, sewing a textile fabric like a general sewing sewing machine that stitches a textile fabric by lacing or looping a sewing thread such as a lower thread to form a seam In addition to feed dogs that move in the row direction, needles that allow the thread to penetrate the fiber fabric, fabric pressers and their up-and-down reciprocating motion mechanisms, shuttles for lower thread supply for performing racing and looping and their operating mechanisms It is possible to omit or reduce the use of multiple complicated mechanisms and parts for forming stitches with thread such as looper for supplying looper thread and its operating mechanism, etc., simplifying and downsizing the overall structure of the sewing machine It has the feature that it is easy to plan.

  As a high-frequency sewing machine having the above-described features, the present applicants have a general sewing machine that includes a work material in which a fiber fabric is a target material and a thermoplastic resin tape is sandwiched between overlapping portions of the fiber fabric. Using a feed dog, the workpiece is intermittently transferred in a specific direction along the horizontal surface on the workpiece mounting plate, that is, while alternately repeating the transfer and the transfer stop, the pair of upper and lower electrodes are moved to the workpiece each time the transfer is stopped. The thermoplastic resin tape is melted by high-frequency dielectric heating so that the upper and lower sides (front and back) of the metal plate are brought into contact with each other, and high-frequency power is applied between the pair of electrodes in the pressed state. A high-frequency sewing machine configured to bond the parts has been developed and a patent application has already been filed (for example, see Patent Document 1).

  In the high frequency sewing machine disclosed in Patent Document 1, the resin tape is melted by a certain unit area by the high frequency power applied between the pair of electrodes along with the intermittent transfer of the workpiece, and the unit By partially wrapping the molten area part in the transfer direction, it is possible to repeatedly bond the same part, so that the overlapping part can be bonded substantially uniformly over the entire length while using a relatively low high-frequency power. it can. In addition, the heat generated by the high frequency power can be distributed to the surface contact portions of the pair of electrodes without being concentrated on the minimum area portion such as a line or a point contact portion. It is possible to avoid as much as possible the occurrence of defective parts such as burnout and broken holes (perforations) of the fiber fabric due to concentration on the part. Furthermore, by utilizing the feed dog provided in a general sewing machine, the direction of the workpiece can be changed arbitrarily when the feed is stopped. It is possible to cope with the bonding process. As a result, even if the material to be bonded is a fiber fabric that is weak against heat, or even when an apparel product with a large number of curved parts is to be processed, it is possible to produce and process an apparel product with a good finish. can get.

  On the other hand, in the high frequency sewing machine disclosed in Patent Document 1, the opposing surfaces of the pair of upper and lower electrodes are in direct contact with and pressed against the upper and lower (front and back) surfaces of the fiber fabric in the workpiece, so In particular, traces due to electrode pressing (hereinafter referred to as “pressing traces”) are likely to occur. Further, in order to prevent adhesion leakage or adhesion failure over the entire length of the bonded portion such as the overlapping portion, part of the unit melted area portion by the pair of electrodes is wrapped in the workpiece feed direction. There is a need. Therefore, more heat is given to the wrapping part than the non-wrapping part, and linear overheating traces, commonly known as shine, along the direction perpendicular to the feed direction of the workpiece on both the front and back sides of the fiber fabric Hereinafter, “overheating mark” is likely to occur intermittently. As a result, as an apparel product manufactured from the fiber fabric, the appearance and appearance of the apparel product are poor, and the product value is liable to decrease.

  Therefore, in order to eliminate the problems of the high-frequency sewing machine disclosed in Patent Document 1 described above, that is, the occurrence of pressing marks and the intermittent generation of overheating marks, the present applicants at least of the pair of upper and lower electrodes. The upper electrode is always spaced upward from the surface of the workpiece, and the pair of electrodes is kept in non-contact with the surface of the workpiece or both front and back surfaces, and a predetermined value of high frequency power is continuously applied between the pair of electrodes. A high-frequency sewing machine configured so as to be applied is developed and a patent application has already been filed (for example, see Patent Document 2).

  JP 2011-47099 A   Japanese Patent Application No. 2012-222519

  According to the high frequency sewing machine developed by the present applicants and already applied for a patent shown in Patent Document 2, at least the upper electrode is bonded to the surface of the workpiece (fiber fabric) in a non-contact state. Therefore, it is possible to eliminate the generation of pressing marks, which is one problem of the high-frequency sewing machine of Patent Document 1, and to equalize the heat generated by the high-frequency power over the entire length of the bonded portion of the workpiece. Since it can be given substantially evenly, it is possible to eliminate the intermittent occurrence of overheating marks, which is another problem of the high-frequency sewing machine of Patent Document 1.

However, in the high-frequency sewing machine of Patent Document 2 developed by the present applicants and already applied for a patent, a pair of upper and lower electrodes are always arranged facing each other with a certain distance between the workpieces. The heat generated by the application of high-frequency power is generated in parts such as parts adjacent to wires and electrodes, and the influence of the heat generation diffuses to the surroundings, causing the fiber fabric to burn or burn out. It is easy to generate.
Moreover, in the high frequency sewing machine of Patent Document 2, a roller device composed of a pair of upper and lower rollers arranged so as to sandwich the workpiece from both the front and back surfaces is used as the workpiece transfer means, and the pair of upper and lower rollers of the roller device is used. Because the relative rotation of the workpiece causes the workpiece to be forcibly transferred continuously at a constant speed in the direction of processing, so that the adhesive of the thermoplastic resin tape melted by high-frequency power can easily penetrate into the fiber fabric. Although it is desirable to increase the pressing force by the roller, in such a case, the fiber fabric of the workpiece is easily corrugated due to the strong pressing force by the roller, and as a result, the new finish of the manufactured apparel product deteriorates. The problem remained.

  The present invention has been made in view of the above circumstances, and not only eliminates the occurrence of pressing marks and overheating marks, but also prevents deterioration of the finish due to scoring, burning, and undulation of the fiber fabric, and adhesion of curved portions. Another object of the present invention is to provide a high-frequency sewing machine that can be easily and reliably performed.

  The high-frequency sewing machine according to the present invention devised to achieve the above object is to butt the work piece or the two pieces of fiber dough, in which the thermoplastic resin tape is sandwiched between the overlapping portions of the fiber dough A workpiece placing plate disposed and supported so as to be slidably movable to place the workpiece on which the thermoplastic resin tape is placed between the upper surfaces of the butted ends of the two fiber fabrics; A pair of upper and lower heat-resistant endless belts that convey the workpiece to be mounted and supported on the mounting surface of the workpiece mounting plate from above and below in a specific direction along a horizontal plane, and the pair of upper and lower heat-resistant endless belts A pair of upper and lower rollers arranged at positions sandwiching the workpiece from above and below, and forcibly transferring the workpiece at a constant speed in the specific direction by relative rotation of these rollers, and the workpiece On top of the workpiece mounting plate An upper electrode having a pressing function for pressing the workpiece against the placement surface; a lower electrode disposed at a lower portion of the workpiece placing plate so as to face the upper electrode; and the upper portion A high-frequency power application device that applies high-frequency power between the lower electrode and the lower electrode, and a control unit, and is placed and supported on a placement surface of the workpiece placing plate and transferred in the specific direction. By applying high-frequency power between the upper and lower electrodes from the high-frequency power applying device to the work material, the thermoplastic resin tape is melted by high-frequency dielectric heating, so that the overlapping portion or the butt end portion of the fiber fabric is formed. A high frequency sewing machine configured to be bonded via the thermoplastic resin tape, wherein the upper roller of the roller device is moved up and down to a position approaching the lower roller and a position separating upward. A roller raising / lowering mechanism, and a position at which the upper electrode approaches the lower electrode through a partial vertical displacement of the pair of upper and lower heat-resistant endless belts disposed below the workpiece placing plate and above An electrode lifting / lowering mechanism that lifts and lowers to a position separated from each other is provided, and the control unit moves the upper roller and the upper electrode closer to the lower roller and the lower electrode by the roller lifting / lowering mechanism and the electrode lifting / lowering mechanism, respectively. A first bonding operation mode in which a high-frequency power of a predetermined value is continuously applied between the upper and lower electrodes from the high-frequency power applying device, while the workpiece is continuously transferred in the specific direction by being lowered to a position to be The upper roller is raised to a position spaced apart upward from the lower roller by the roller lifting mechanism, and the upper electrode is opposed to the lower electrode by the electrode lifting mechanism. Then, the high frequency power of a predetermined value is intermittently transferred between the upper and lower electrodes from the high frequency power applying device while the workpiece is moved up and down intermittently between the position separated upward and the position approached. It is characterized in that it can be switched to the second bonding operation mode to be applied automatically.

  According to the high-frequency sewing machine of the present invention configured as described above, the overall structure of the sewing machine can be simplified and miniaturized more easily than a general sewing machine, and is provided between a pair of electrodes. The heat generated by the high-frequency power can be distributed to the surface contact portions of a pair of electrodes without being concentrated on the minimum area such as a line or point contact, and the heat generated by the high-frequency power is concentrated on the minimum area. In addition to having the advantage of avoiding the occurrence of defective parts such as burnout and broken holes (drilling) of the fiber fabric as much as possible, the workpiece is moved up and down with a pair of upper and lower heat-resistant endless belts. Since the workpiece can be continuously passed between the pair of electrodes together with the pair of upper and lower endless belts, the electrodes are directly attached to both the front and back sides of the fiber fabric of the workpiece. It is possible to eliminate the occurrence of pressing marks and intermittent overheating marks due to contact with.

  In addition, since the workpiece is sandwiched and transferred between a pair of upper and lower endless belts, the pressing force applied to the workpiece by the upper roller in the roller device so that the adhesive of the melted plastic resin tape can easily penetrate into the fiber fabric. Even if it is set to be strong, it is possible to suppress the fiber fabric from undulating due to the pressing force.

  In addition, if necessary, the upper roller in the roller device is raised to a position that is spaced upward with respect to the lower roller, and the upper electrode is moved relative to the lower electrode through partial vertical displacement of a pair of upper and lower endless belts. The second bonding operation mode is controlled by switching to the second bonding operation mode in which high-frequency power is intermittently applied between the upper and lower electrodes while the workpiece is moved up and down intermittently. The contact pressure applied to the workpiece when the upper electrode rises intermittently is smaller than in the first bonding operation mode in which both the upper roller and the upper electrode are in the lowered position, and every moment when the contact pressure decreases. By swinging the workpiece in any direction, the direction of the workpiece can be gradually changed, and not only a straight line but also a curve can be easily transferred. Therefore, the curved portion can be easily and reliably adhered.

  Due to the above synergistic effect, the present invention prevents the occurrence of press marks and overheating marks, scoring and burning of the fiber fabric, and the occurrence of defective finish due to undulations, and as an apparel product manufactured from the fiber fabric, Appearance and appearance are good, the product value can be improved, and a high-frequency sewing machine that can be sufficiently applied to the adhesion of curved portions can be provided.

In the high-frequency sewing machine, the pair of upper and lower heat resistant endless belts are made of fluorinated ethylene resin, and the upper and lower opposed surfaces sandwiching the workpiece are driven and moved separately in the upper and lower directions so as to move at the same speed toward the specific direction. (Claim 2) is that the upper endless belt of the pair of upper and lower heat resistant endless belts has a moving speed relative to the moving speed of the lower endless belt. More preferably, the configuration is adjustable (claim 3).
In this case, by adjusting the moving speed of the pair of upper and lower heat resistant endless belts relative to each other, it is possible to correct the positional deviation in the transfer direction between the lower fiber fabric portion and the upper fiber fabric portion that are overlapped. It is possible to prevent the bonding in a misaligned state and to obtain an apparel product with a better finish.

Further, in the high frequency sewing machine, the electrode lifting mechanism is in contact with the lower surface of the lower heat-resistant endless belt by a combination of horizontal movement and vertical movement to intermittently place a pair of the upper and lower heat-resistant endless belts and a part of the workpiece. It is preferable that a push-up member that intermittently moves up and down to be repeatedly displaced up and down is provided.
In this case, in the second bonding operation mode, the pair of upper and lower endless belts and a part of the workpiece are repeatedly displaced up and down repeatedly by intermittently moving the push-up member disposed below the pair of upper and lower endless belts. Since the upper electrode is moved up and down, the workpiece is always sandwiched between the upper electrode and a pair of upper and lower endless belts, and the fiber fabric of the workpiece is displaced during the second bonding operation mode. It is possible to reliably maintain the curve transfer due to the change of direction of the work material. In addition, the electrode lifting mechanism using the push-up member as described above effectively utilizes a known feed dog circulation drive mechanism configured to drive a feed dog of a general sewing machine by a combination of horizontal movement and vertical movement. And can be configured easily.

In the high-frequency sewing machine, the control unit first raises the upper roller to a position spaced apart from the lower roller by the roller lifting mechanism in accordance with the switching to the second bonding operation mode. Next, it is preferable that control is performed to intermittently raise and lower the upper electrode with respect to the lower electrode by the electrode elevating mechanism while maintaining the ascending state of the upper roller (Claim 5). .
In this case, when switching to the second bonding operation mode, the upper roller is first lifted and separated upward by the roller lifting mechanism, and then the upper electrode is intermittently moved by the electrode lifting mechanism while maintaining that state. Therefore, it is possible to reduce the operation load of the electrode lifting mechanism that lifts and lowers the upper electrode intermittently. In particular, in the case of an electrode lifting mechanism using a thrust member, the thrust area of the thrust member itself can be reduced as much as possible by reducing the operating load, and the lifting mechanism can be reduced in size and simplified.

  Further, in the high-frequency sewing machine, the high-frequency power applying device has an adhesive force at the overlapping portion or the butt end portion of the fiber fabric both in the second bonding operation mode and in the first bonding operation mode. It is preferable that the output of the high-frequency power applied between the upper and lower electrodes can be adjusted so as to be kept constant or substantially constant (Claim 6).

  The reason for adopting such a configuration is as follows. That is, in the second bonding operation mode in which high-frequency power is intermittently applied between the upper electrode and the lower electrode, compared to in the first bonding operation mode in which high-frequency power is continuously applied between the upper electrode and the lower electrode. Also, the adhesive strength at the overlapped or butt end portion of the fiber fabric is reduced. In order to solve this problem, that is, in order to keep the adhesive force in the second bonding operation mode equal to or substantially the same as that in the first bonding operation mode, the workpiece is conveyed by the pair of endless belts. It is desired to make the speed lower than the conveyance speed in the first bonding operation mode and increase the value of the applied high frequency power. Further, the conveyance speed of the workpiece by the pair of endless belts is appropriately adjusted according to, for example, the type of the fiber fabric, but is always equal or substantially equal regardless of the adjustment of the conveyance speed. It is also important to ensure the strength and not to damage the fiber fabric due to the occurrence of sparks between the upper and lower electrodes.

  Considering these points comprehensively, when configured to adjust the output of the high-frequency power, it is possible to arbitrarily adjust the output of the high-frequency power according to the adjustment of the conveyance speed, Regardless of the conveyance speed of the workpiece in the first and second bonding operation modes, a constant or substantially constant bonding force can be maintained, and the occurrence of damage to the fiber fabric due to sparks can be prevented. Even when a workpiece with a mixture of straight and linear parts is to be bonded, the entire area of the bonded part is bonded uniformly or substantially uniformly, and an apparel product with a good finish that does not damage the fiber fabric is ensured. Can be processed.

It is an external appearance perspective view of the whole high frequency sewing machine concerning an embodiment of the invention. It is a left side view which fractures | ruptures and shows a part of whole high frequency sewing machine same as the above. It is an expanded sectional view of the principal part of the workpiece used as a process target by a high frequency sewing machine same as the above. It is an enlarged vertical front view of the principal part explaining the structure of the principal part in a high frequency sewing machine same as the above. It is an expanded vertical side view of the principal part explaining the structure of the principal part in a high frequency sewing machine same as the above. It is a block diagram which shows the structure of the high frequency electric power provision apparatus and control system in a high frequency sewing machine same as the above. It is an image figure of the adhesion processing operation state by a high frequency sewing machine same as the above, (A) shows the 1st adhesion operation mode, and (B) shows the middle of switching from the 1st adhesion operation mode to the 2nd adhesion operation mode. , (C) shows the second bonding operation mode. It is an enlarged vertical front view of the principal part when a high frequency sewing machine same as the above is in the 1st adhesion operation mode. It is an expansion vertical side view of the principal part at the time of being in 1st adhesion | attachment operation mode same as the above. It is an enlarged vertical front view of the principal part when a high frequency sewing machine same as the above is in the 2nd adhesion operation mode. It is an expansion vertical side view of the principal part at the time of being in 2nd adhesion | attachment operation mode same as the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of the whole high-frequency sewing machine according to the embodiment of the present invention, FIG. 2 is a left side view showing a part of the whole high-frequency sewing machine, and FIG. 3 is a workpiece to be processed by the high-frequency sewing machine. 4 is an enlarged cross-sectional view of the main part of the workpiece, FIG. 4 is an enlarged vertical front view of the main part illustrating the configuration of the main part of the high-frequency sewing machine, and FIG. 5 is an enlarged main part illustrating the structure of the main part of the high-frequency sewing machine. It is a vertical side view.

As shown in FIGS. 1 and 2, the high-frequency sewing machine 1 includes a sewing machine body 2, a sewing machine arm unit 3, and a sewing machine bed unit 4.
On the upper end of the sewing machine bed portion 4, a work material placing plate for placing a work material H (described later) so as to be slidable and movable (this corresponds to a needle plate in a general sewing machine, 5), the sliding plate 6 and the working plate 7 are attached so that their upper surfaces are flush or substantially flush. The mounting plate 5, the sliding plate 6, and the working plate 7 are structural materials such as polyamide, polyacetal, ABS, and polycarbonate, and are materials having wear resistance, corrosion resistance, electrical insulation, and heat resistance. Consists of engineering plastics. In particular, as the constituent material of the mounting plate 5, it is preferable to use a super engineering plastic made of a polyether / ether / ketone resin. In this case, the heat resistance and wear resistance of the mounting plate 5, the sliding plate 6, and the work plate 7 can be further improved.

  As shown in FIG. 3A, the workpiece H to be processed by the high-frequency sewing machine 1 is folded up at the end of one piece of the fiber fabric W and overlapped vertically. A hot melt (such as Nittobo's trade name “Dan-Fuse”) T, which is a thermoplastic resin tape with both front and back surfaces formed on the adhesive surface, is sandwiched between fiber fabric portions, FIG. 3 (B) As shown in FIG. 2, the end portions of the two fiber fabrics W, W are butted against each other, and the hot melt T is placed between the upper surfaces of the butted end portions of the two fiber fabrics W, W ( As shown in FIG. 3C, the ends of the two fiber fabrics W, W are stacked one above the other, and the hot melt T is sandwiched between the overlapping ends. Any of these may be used.

In addition to the mounting plate 5, the sliding plate 6 and the work plate 7, the high-frequency sewing machine 1 is placed on the horizontal surface with the workpiece H mounted on the mounting surface of the mounting plate 5 from above and below. A pair of upper and lower heat-resistant endless belts 8 and 9 transported in a specific direction along the adhesive processing direction X, and substantially horizontal belt portions 8a and 9a opposed to the upper and lower sides of the pair of upper and lower heat-resistant endless belts 8 and 9 A roller device 12 composed of a pair of upper and lower rollers 10, 11 disposed at a position sandwiching the workpiece H from above and below in the vicinity of the end position in the bonding processing direction X, and the roller device 12 in proximity to the roller device 12. The upper electrode 13 disposed on the upper portion of the mounting plate 5 in the upstream portion in the bonding direction X, the lower electrode 14 disposed on the lower portion of the mounting plate 5 so as to face the upper electrode 13, Upper electrode 13 and lower electrode 1 Includes a high-frequency power applying device 15 that applies a high frequency power (see FIG. 6), the control unit 16 (see FIG. 6), the between.
The upper electrode 13 is a positive electrode, and the lower electrode 14 is a negative electrode.

  The pair of upper and lower heat resistant endless belts 8 and 9 are made of a fluorinated ethylene resin such as PTFE. As shown in FIGS. 4 and 5, the upper endless belt 8 of the pair of upper and lower heat resistant endless belts 8 and 9 has a driving pulley 18 fixed to an output shaft 17a of a driving motor (stepping motor) 17 and the above description. It is wound around the driven pulley 19 disposed above the starting end position in the adhesion processing direction X of the mounting plate 5, the upper roller 10 and the plurality of guide pulleys 20 in the roller device 12 so as to circulate, A substantially horizontal belt portion 8 a between the driven pulley 19 and the upper roller 10 is configured to move in the adhesion processing direction X between the mounting plate 5 and the upper electrode 13.

  The lower endless belt 9 is wound around an output shaft 21a of a drive motor (stepping motor) 21 so as to circulate between a fixed drive pulley 22 and a plurality of guide pulleys 23. A horizontal belt portion 9a that faces the substantially horizontal belt portion 8a of the endless belt 8 and that is longer than the substantially horizontal belt portion 8a in the bonding processing direction X extends in the bonding processing direction X along the upper surfaces of the mounting plate 5 and the lower electrode 14 described above. Is configured to move.

  With the above configuration, the pair of upper and lower endless belts 8 and 9 are in a state where the workpiece H is sandwiched between the substantially horizontal belt portion 8a of the upper endless belt 8 and the horizontal belt portion 9a of the lower endless belt 8. The workpiece H is transported in the bonding process direction X between the upper and lower electrodes 13 and 14 and between the upper and lower rollers 10 and 11.

  The pair of upper and lower endless belts 8 and 9 can be switched between two stages, high speed and low speed, by controlling the rotational speed of the drive motors 17 and 21. The substantially horizontal belt portions 8a and 9a to be moved in the bonding processing direction X at the same speed. Further, the drive motor 17 on the upper endless belt 8 side can finely adjust the moving speed of the upper endless belt 8 based on the moving speed of the lower endless belt 9 (manually adjustable). 35 (see FIG. 6).

  As shown in FIGS. 4 and 5, the upper electrode 13 is disposed above the mounting plate 5 between the driven pulley 19 and the upper roller 10, and an electrode lifting mechanism 24 described later is provided. Through the lower electrode 14 and the lower position away from the lower electrode 14 so that the upper electrode 13 is lowered to a position closer to the lower electrode 14. The work piece H that is sandwiched and conveyed between the pair of upper and lower endless belts 8 and 9 has a pressing function of pressing the work piece H against the placement surface side of the placement plate 5.

  On the other hand, the lower electrode 14 is fixed so that the electrode surface is flush with the mounting surface of the mounting plate 5 through the upper and lower through holes 5 a formed in the mounting plate 5. Further, a preheating cartridge heater 26 for maintaining the lower electrode 14 in a high temperature state is inserted and held in the lower electrode 14 during the bonding operation accompanying the application of high-frequency power.

  The upper roller 10 in the roller device 12 is configured to be able to move up and down to a position approaching the lower roller 11 and a position spaced apart upward via a roller lifting mechanism 25 described later. On the other hand, the lower roller 11 in the roller device 12 is formed at the lower portion of the mounting plate 5 so that the outer peripheral surface contacts the lower surface of the lower endless belt 8 through the through hole portion 5b formed in the mounting plate 5. It is rotatably supported on a frame 29 fixed to the sewing machine bed 4.

  With the above configuration, when the upper roller 10 is lowered to a position where the upper roller 10 approaches the lower roller 11, the roller device 12 is interposed via the spring 28 interposed between the roller mounting base 26 and the support frame 27 of the upper electrode 13. The workpiece H that is sandwiched and conveyed between the pair of upper and lower endless belts 8 and 9 is pressed against the lower roller 11 to a predetermined pressure or more and melted by high-frequency dielectric heating. The function of allowing the adhesive of the thermoplastic resin tape T to penetrate into the fiber fabric W is exhibited.

  The roller elevating mechanism 25 includes an elevating shaft 30 extending upward from the roller mounting base 26 and an elevating drive mechanism incorporated in the sewing machine arm portion 3 so as to drive the elevating shaft 30 up and down. The raising / lowering drive mechanism of the roller raising / lowering mechanism 25 has the same configuration as the presser raising / lowering driving mechanism employed for raising / lowering the fabric presser in a general sewing machine, and the presser raising / lowering driving mechanism is used as it is. It is diverted to the mechanism 25. Accordingly, since the presser lifting drive mechanism itself in a general sewing machine is well known, description and illustration of a specific configuration of the roller lifting mechanism 25 that diverts it will be omitted.

  The electrode lifting mechanism 24 is intermittently lifted up and down through a thrust member 31 disposed in the vicinity of the upstream of the lower electrode 14 and the thrust member 31 through the upper and lower through holes 5a formed in the mounting plate 5 described above. As shown in the figure, it consists of a combined motion mechanism (synthetic motion mechanism) combined with a horizontal motion and a vertical motion built into the sewing machine bed portion 4. The combined motion mechanism of the electrode lifting mechanism 24 has the same configuration as the feed dog combined motion mechanism for intermittently transferring the cloth in a general sewing machine, and the combined motion mechanism is directly used as the electrode lifting mechanism 24. Yes. Therefore, since the combined movement mechanism of the feed dog in a general sewing machine is well known, description and illustration of a specific configuration of the electrode lifting mechanism 24 that diverts it will be omitted.

  The electrode raising / lowering mechanism 24 moves up and down with the upper end of the push-up member 31 in contact with the lower surface of the lower endless belt 9 so that the substantially horizontal belt of the pair of upper and lower endless belts 8 and 9 is moved. The portions 8a and 9a and a part of the workpiece H are intermittently repeatedly displaced up and down, and the upper electrode 13 is intermittently moved to a position approaching the lower electrode 14 and a position separating upward from the repeated displacement. Raise and lower.

A double-acting cylinder (not shown) that can be operated in the vertical direction in a posture substantially parallel to the lifting shaft 30 is installed inside the sewing machine arm portion 3. A stopper member 33 that contacts the top surface of the support frame 27 of the upper electrode 13 and restricts the upward movement (upward movement) of the upper electrode 13 is fixed to the lower end of the lower cylinder rod 32 in the double acting cylinder. ing.
The push-up member 31 in the electrode lifting mechanism 24 is formed in a plate shape that is slightly narrower than the lateral width of the pair of upper and lower endless belts 8 and 9.

Next, the configuration of the high-frequency power application device 15 and the configuration of the control unit 16 will be described.
As shown in FIG. 6, the high-frequency power applying device 15 includes a high-frequency oscillator 40, a high-frequency matching device 41, a control circuit 42 for controlling the output of high-frequency power, and an output adjusting unit 43 for high-frequency power, and is bonded. During the processing operation, a high-frequency power having a predetermined value is continuously or intermittently applied between the upper and lower electrodes 13 and 14.

  In addition to the above-described components, the high-frequency sewing machine 1 according to the present embodiment is for switching the rotation and stop of the drive motors 17 and 21 and the rotation speed of the pair of upper and lower endless belts 8 and 9 between high speed and low speed. A pedal 44 and a knee switch 45 for operating and stopping the roller lifting mechanism 25 and the electrode lifting mechanism 24 are provided. A depression signal and a depression signal of the pedal 44 and an on signal and an off signal of the knee switch 45 are input to the control unit 16. On the other hand, the control unit 16 outputs an operation control signal to each of the control circuit 42, the drive motors 17 and 21, the electrode elevating mechanism 24, and the roller elevating mechanism 25 in the high frequency power application device 15.

  In the high-frequency sewing machine 1 having the above-described configuration, the control unit 16 transmits the stepping signal and the stepping-back signal and the on / off signal of the knee switch 45 to the control unit 16 according to the input to the control unit 16. By causing the operation control signals to be output to 42, 17, 21, 24 and 25, it is possible to switch between a first bonding operation mode and a second bonding operation mode as will be described later.

Next, the bonding operation of the high-frequency sewing machine 1 according to the present invention will be described in detail with reference to FIGS. 7A to 7C, FIGS. 8 and 9, and FIGS. 10 and 11.
(1) First bonding operation mode: When the pedal 44 is depressed, a depression signal is input to the control unit 16, whereby the drive motors 17 and 21 start rotating and the pair of upper and lower endless belts 8 and 9 are operated at high speed. 7A, 8 and 9, the upper roller 10 in the roller device 12 approaches the lower roller 11 via the roller lifting mechanism 25. The upper electrode 13 is lowered to a position close to the lower electrode 14 via the electrode lifting mechanism 24.

  In this state, the workpiece H placed and supported on the placing plate 5, the sliding plate 6 and the work plate 7 is sandwiched between the pair of upper and lower endless belts 8 and 9 and fast in the bonding process direction X. In addition, when passing between the upper and lower electrodes 13, 14 while being continuously and linearly transferred, a predetermined value of high frequency power is applied between the upper and lower electrodes 13, 14 from the high frequency power applying device 15, and the workpiece The H thermoplastic resin tape T is melted by high frequency dielectric heating. Thereafter, when the work material H including the molten thermoplastic resin tape T passes between the pair of upper and lower rollers 10 and 11 of the roller device 12, the work material H is pressed and melted. Adhesive penetrates into the butted ends or overlapping portions of the fiber fabrics W and W, and the fiber fabrics W and W are bonded. The pedal 44 remains depressed until the linear bonding operation in the first bonding operation mode is completed. When the pedal 44 is returned to the original state after the bonding operation is completed, a step back signal is input to the control unit 16. The rotation of the drive motors 17 and 21 is stopped, and the pair of upper and lower endless belts 8 and 9 are stopped.

(2) Second bonding operation mode: When the knee switch 45 is turned on, the on signal is input to the control unit 16 to activate the roller lifting mechanism 25, as shown in FIG. The upper roller 10 of the roller device 12 rises to a position where it is separated upward with respect to the lower roller 11. Next, when the pedal 44 is depressed and a depression signal is input to the control unit 16 by the depression, the electrode elevating mechanism 24 is operated, and the intermittent raising / lowering movement of the push-up member 31 of the electrode elevating mechanism 24 is performed. 7C and FIGS. 10 and 11, a pair of upper and lower endless belts 8 and 9 and a part of the workpiece H are intermittently moved up and down.

(2) Second bonding operation mode: When the knee switch 45 is turned on, the on signal is input to the control unit 16 to activate the roller lifting mechanism 25, as shown in FIG. The upper roller 10 of the roller device 12 rises to a position where it is separated upward with respect to the lower roller 11. Next, when the pedal 44 is depressed and a depression signal is input to the control unit 16 by the depression, the electrode elevating mechanism 24 is operated, and the intermittent raising / lowering movement of the push-up member 31 of the electrode elevating mechanism 24 is performed. 7 (C) and FIGS. 10 and 11, a pair of upper and lower endless belts 8 and 9 and a part of the workpiece H are intermittently repeatedly displaced up and down, and the upper electrode corresponds to the repeated displacement. At the same time, the drive motors 17 and 21 start rotating and the pair of upper and lower endless belts 8 and 9 move at a lower speed. Controlled. In this state, the workpiece H to be placed and supported on the placing plate 5, the sliding plate 6 and the working plate 7 is sandwiched between the pair of upper and lower endless belts 8 and 9 and is slow in the bonding processing direction X. Each time the upper electrode 13 is intermittently lowered to a position approaching the lower electrode 14 when passing between the upper and lower electrodes 13 and 14, the upper and lower electrodes 13, A high-frequency power having a predetermined value is intermittently applied between 14 and the thermoplastic resin tape T of the workpiece H is melted by high-frequency dielectric heating. In this second bonding operation mode, since the moving speed of the workpiece H transferred between the pair of upper and lower endless belts 8 and 9 is low, only high-frequency power is intermittently applied. However, the thermoplastic resin tape T can be continuously melted in the bonding process direction X, and the adhesive of the thermoplastic resin tape T can be applied to the entire butt end or overlapping portion of the fiber fabrics W and W. The fiber fabrics W, W can be firmly and firmly bonded by evenly penetrating.

  Further, in the second bonding operation mode, the upper roller 10 is kept lifted to a position separated upward from the lower roller 11, and the upper electrode 13 is separated from the lower electrode 14 upward. Since the contact pressure applied to the workpiece H when it is intermittently increased is smaller than that in the first bonding operation mode, the operator can set the workpiece H at every moment when the contact pressure decreases. The workpiece H is gradually changed in direction and easily transferred in a curved line, and the curved part can be bonded easily and reliably.

  Then, after the bonding operation, the pedal 44 is turned back and the return signal is input to the control unit 16 to stop the movement of the pair of upper and lower endless belts 8. Subsequently, when the pedal 44 is depressed again and the depression signal is input to the control unit 16, the upper electrode 13 and the upper roller 10 are raised. In this state, the processed product in which the overlapping portions or the butted end portions of the fiber fabrics W, W are bonded by the thermoplastic resin tape T can be taken out from the high-frequency sewing machine 1.

  Note that the predetermined value of the high-frequency power applied between the pair of upper and lower electrodes 13 and 14 in the first bonding operation mode and the second bonding operation mode is that the pair of electrodes 13 and 14 to be dielectrically heated is thermoplastic. This is a necessary and sufficient value for melting the resin tape T and bonding the overlapping end portions of the fiber fabric W. This value is set in advance according to the heat resistance of the fiber fabric W to be bonded. The In particular, in the second bonding operation mode in which high-frequency power is intermittently applied between the upper electrode 13 and the lower electrode 14, the first bonding in which high-frequency power is continuously applied between the upper electrode 13 and the lower electrode 14. Compared with the operation mode, the adhesive strength at the overlapping portion or the butting end portion of the fiber fabric is likely to be reduced. In order to solve this problem, that is, in order to keep the adhesive force in the second adhesive operation mode equal to or substantially equivalent to the adhesive force in the first adhesive operation mode, the workpieces processed by the pair of endless belts 8 and 9 are processed. It is desirable to set the conveyance speed of the material H to be lower than the conveyance speed in the first bonding operation mode and to set the value of the high-frequency power to be applied to a value slightly larger than that in the first bonding operation mode.

  However, the conveyance speed of the workpiece H by the pair of endless belts 8 and 9 is configured to be appropriately adjusted according to the type of the fiber fabric, for example. Therefore, when the conveyance speed of the workpiece H is adjusted, the output of the high frequency power is also arbitrarily adjusted via the output adjustment unit 43 according to the speed adjustment. Thereby, regardless of the adjustment of the conveying speed of the workpiece H, it is possible to always ensure the same or substantially the same adhesive force, and the second adhesion in which the upper and lower electrodes 13 and 14 are intermittently separated. It is also possible to prevent the fiber fabric from being damaged by the occurrence of sparks between the upper and lower electrodes 13 and 14 in the operation mode.

  As a result, a workpiece having a mixture of curved parts and straight parts is to be bonded, and even when it is transported at any speed, the entire area of the bonded part is bonded uniformly or substantially uniformly, and the fiber fabric Apparel products with good finish without damage to can be reliably processed.

  The high-frequency sewing machine 1 according to the present embodiment as described in detail above is provided with an advantage that the overall structure of the sewing machine is simplified and downsized as compared with a general sewing sewing machine, and between a pair of electrodes. The heat generated by the high-frequency power can be distributed to the surface contact portions of the pair of upper and lower electrodes 13 and 14 without being concentrated on the minimum area such as a line or point contact portion, and the heat generated by the high-frequency power is minimal. In addition to having the advantage of avoiding as much as possible the occurrence of defective parts such as burnout and broken holes (perforations) of the fiber fabric due to concentration in the area, the workpiece H is paired with heat resistant upper and lower. The work material H can be continuously passed between the pair of upper and lower electrodes 13 and 14 together with the pair of upper and lower endless belts 8 and 9 by being sandwiched from above and below by the conductive endless belts 8 and 9. , It is possible to eliminate the occurrence of pressing marks and intermittent overheating marks due to contact on both surfaces electrodes 13 and 14 directly to the fiber fabric workpiece H.

  Further, since the workpiece H is sandwiched and transferred by the pair of upper and lower endless belts 8 and 9, the upper roller 10 in the roller device 12 allows the adhesive of the melted plastic resin tape T to easily penetrate into the fiber fabric. Even if the pressing force to the workpiece H is set to be strong, it is possible to suppress the fiber fabric from undulating due to the pressing force. As a result, as an apparel product manufactured from the fiber fabric, the appearance and appearance are very good in terms of finish, and the product value can be improved.

  In addition, by appropriately combining the first bonding operation mode and the second bonding operation mode as described above, for example, a workpiece in which a linear portion → a curved portion is connected, a curved portion → a linear portion is obtained. The parts to be bonded include straight lines and curved lines, such as continuous workpieces, straight parts → curved parts → workpieces connecting straight parts, curved parts → straight parts → curved parts. Even a workpiece having any form of part can be easily and reliably bonded along each part.

Further, in the high-frequency sewing machine 1 of the present embodiment, the moving speed of the upper endless belt 8 of the pair of upper and lower heat resistant endless belts 8 and 9 can be adjusted with respect to the moving speed of the lower endless belt 9. A speed adjusting unit 35 is provided.
In this case, by appropriately operating the speed adjusting unit 35 and relatively adjusting the moving speed of the pair of upper and lower heat resistant endless belts 8 and 9, the lower fiber fabric portion and the upper fiber fabric portion that are overlapped with each other. Therefore, it is possible to prevent the upper and lower fiber fabric portions from being bonded in a state of being displaced, and to obtain an apparel product with a better finish.

  Further, in the high-frequency sewing machine 1 of the present embodiment, as the electrode lifting mechanism 24, a pair of upper and lower heat resistant endless belts 8, 9 are brought into contact with the lower surface of the lower heat resistant endless belt 9 by a combination of horizontal movement and vertical movement. A mechanism using a push-up member 31 that moves intermittently up and down so that a part of the workpiece H is intermittently repeatedly displaced up and down is employed. As a result, a known feed dog circulation drive mechanism configured to drive the feed dog of a general sewing machine by a combination of horizontal movement and vertical movement can be effectively used to make the structure simple and small. it can.

  Further, in the high frequency sewing machine 1 of the present embodiment, the upper roller 10 is first moved to the lower roller 11 by the roller lifting mechanism 25 in accordance with the switching from the first bonding operation mode to the second bonding operation mode. The upper electrode 13 is moved up and down to a position separated upward, and then the upper electrode 13 is raised and lowered intermittently with respect to the lower electrode 14 by the electrode elevating mechanism 24 while the upper roller 10 is maintained in the raised state. Is configured to do.

  In this case, when switching to the second bonding operation mode, the upper roller 10 is first lifted and separated upward by the roller lifting mechanism 25 and then the upper electrode 14 is moved by the electrode lifting mechanism 24 while maintaining this state. Since the upper roller 10 is moved up and down intermittently, the operation load of the electrode lifting mechanism 24 can be reduced as compared with the upper roller 10 that moves up and down together. In particular, in the case of the electrode elevating mechanism 24 using the push-up member 31, it is possible to reduce the push-up area of the push-up member 31 itself as much as possible by reducing the operation load, and the lift mechanism 24 can be reduced in size and simplified. .

  Further, in the high frequency sewing machine 1 of the present embodiment, the preheating cartridge heater 26 for maintaining the lower electrode 14 at a high temperature is inserted and held in the lower electrode 14 during the bonding operation accompanying the application of the high frequency power. Therefore, in particular, the lower electrode 14 can be preheated to keep the workpiece H at a constantly high temperature. Therefore, the high frequency power applied between the pair of upper and lower electrodes 13 and 14 is set as low as possible to prevent the occurrence of sparks, and the thermoplastic resin tape T is melted surely and quickly to always perform a predetermined bonding process efficiently. It can be performed well and stably.

  Further, as in this embodiment, the mounting plate 5, the sliding plate 6 and the work plate 7 are excellent in wear resistance, electrical insulation and heat resistance, like engineering plastics and super engineering plastics. In addition, the structural strength of the mounting plate 5, the sliding plate 6 and the working plate 7 can be sufficiently secured, and the wear resistance, corrosion resistance, electrical insulation and heat resistance are excellent, and high frequency. Each member used under conditions where electric power is applied can be configured to have high durability.

DESCRIPTION OF SYMBOLS 1 High frequency sewing machine 5 Work material mounting plate 8, 9 A pair of upper and lower heat resistant endless belts 10, 11 A pair of upper and lower rollers 12 Roller devices 13, 14 Upper and lower electrodes 15 High frequency power applying device 16 Control unit 17, 21 Drive motor (Stepping motor)
24 Electrode Elevating Mechanism 25 Roller Elevating Mechanism 31 Push-up Member 35 Speed Adjusting Unit 43 Output Adjusting Unit W Fiber Fabric T Thermoplastic Resin Tape H Work Material

Claims (6)

Work material with thermoplastic resin tape sandwiched between overlapping portions of fiber fabrics or two fiber fabric ends are placed in butt contact, and heat is applied between the upper surfaces of the butt ends of the two fiber fabrics. A work material placing plate for placing and supporting a work material on which a plastic resin tape is placed so as to be slidably movable, and the work placed and supported on a placement surface of the work material placing plate A pair of upper and lower heat-resistant endless belts that convey the material in a specific direction along a horizontal plane with the material sandwiched from above and below, and a pair of upper and lower that are disposed at positions that sandwich the workpiece from above and below via the pair of upper and lower heat-resistant endless belts A roller device comprising a roller for forcibly transporting the work material at a constant speed in the specific direction by relative rotation of the rollers; and the work material placed on the work material placing plate. Has a presser function to press to the surface side A part electrode, a lower electrode disposed at a lower part of the workpiece mounting plate so as to face the upper electrode, a high-frequency power applying device that applies high-frequency power between the upper and lower electrodes, a control unit, With
High-frequency power is applied between the upper and lower electrodes from the high-frequency power applying device to the work material that is placed and supported on the placement surface of the work material placing plate and transferred in the specific direction. The high-frequency sewing machine is configured to melt the thermoplastic resin tape by high-frequency dielectric heating and bond the overlapped portion or the butted end portion of the fiber fabric via the thermoplastic resin tape,
A roller elevating mechanism for elevating the upper roller in the roller device to a position approaching the lower roller and a position separating the upper roller; and a pair of upper and lower heat resistances disposed at the lower part of the workpiece mounting plate An electrode elevating mechanism for elevating and lowering the upper electrode to a position approaching the lower electrode and a position spaced apart upward via a partial vertical displacement of the endless belt;
The control unit lowers each of the upper roller and the upper electrode to a position approaching the lower roller and the lower electrode by the roller lifting mechanism and the electrode lifting mechanism, and continuously transfers the workpiece in the specific direction. A first bonding operation mode in which a high-frequency power of a predetermined value is continuously applied between the upper and lower electrodes from the high-frequency power applying device, and the upper roller is separated upward from the lower roller by the roller lifting mechanism. While raising the position to the position and intermittently raising and lowering the upper electrode to a position approaching the lower electrode with respect to the lower electrode by the electrode lifting mechanism to move the workpiece in the specific direction, It is configured to be switchable to a second bonding operation mode in which a predetermined value of high frequency power is intermittently applied between the upper and lower electrodes from the high frequency power application device. Frequency sewing machine, characterized in that there.   The pair of upper and lower heat resistant endless belts are made of fluorinated ethylene resin, and are configured such that the upper and lower opposing surfaces sandwiching the workpiece are driven and moved separately so as to move at the same speed in the specific direction. The high frequency sewing machine according to claim 1, wherein   2. The high frequency sewing machine according to claim 1, wherein a moving speed of an upper endless belt among the pair of upper and lower heat resistant endless belts is adjustable with respect to a moving speed of a lower endless belt.   The electrode elevating mechanism contacts the lower surface of the lower heat-resistant endless belt by a combination of horizontal movement and vertical movement, and intermittently repeatedly displaces a part of the pair of upper and lower heat-resistant endless belts and the workpiece. The high frequency sewing machine according to any one of claims 1 to 3, further comprising a push-up member that moves intermittently.   In accordance with the switching to the second bonding operation mode, the control unit first raises the upper roller to a position separated upward from the lower roller by the roller lifting mechanism, and then raises the upper roller. 5. The high frequency sewing machine according to claim 1, wherein control is performed to intermittently raise and lower the upper electrode with respect to the lower electrode by the electrode elevating mechanism while maintaining the state. .   In the high-frequency power applying device, the adhesive force at the overlapping portion or the butt end portion of the fiber fabric is held constant or substantially constant in both the second bonding operation mode and the first bonding operation mode. The high frequency sewing machine according to any one of claims 1 to 5, wherein an output of high frequency power applied between the upper and lower electrodes is adjustable.

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