GB2520600A - High frequency sewing machine - Google Patents

High frequency sewing machine Download PDF

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Publication number
GB2520600A
GB2520600A GB1416749.8A GB201416749A GB2520600A GB 2520600 A GB2520600 A GB 2520600A GB 201416749 A GB201416749 A GB 201416749A GB 2520600 A GB2520600 A GB 2520600A
Authority
GB
United Kingdom
Prior art keywords
high frequency
workpiece
electrode
roller
sewing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1416749.8A
Other versions
GB2520600B (en
GB201416749D0 (en
Inventor
Hiroyuki Ueyama
Saki Miyai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamato Sewing Machine Mfg Co Ltd
Original Assignee
Yamato Sewing Machine Mfg Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamato Sewing Machine Mfg Co Ltd filed Critical Yamato Sewing Machine Mfg Co Ltd
Publication of GB201416749D0 publication Critical patent/GB201416749D0/en
Publication of GB2520600A publication Critical patent/GB2520600A/en
Application granted granted Critical
Publication of GB2520600B publication Critical patent/GB2520600B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41H—APPLIANCES OR METHODS FOR MAKING CLOTHES, e.g. FOR DRESS-MAKING OR FOR TAILORING, NOT OTHERWISE PROVIDED FOR
    • A41H43/00—Other methods, machines or appliances
    • A41H43/04—Joining garment parts or blanks by gluing or welding ; Gluing presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/006—Preventing damaging, e.g. of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/845—C-clamp type or sewing machine type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools
    • B29C66/92615—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining tools the gap being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8744—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down
    • B29C66/87443—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down by withdrawing the heating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

A machine 1, suitable for attaching the edges of two pieces of fabric using thermoplastic resin tape, comprises a workpiece mounting plate 5, a pair of endless belts 8, 9 to convey a workpiece (H, figure 8) which is held by a roller device 12 and electrodes 13, 14, which apply high frequency power. The machine 1 also comprises a controller, a roller lifting mechanism (25, figure 4) and an electrode lifting mechanism (24, figure 4). The machine controls switching between a first mode in which a high frequency power is continuously applied between the upper and lower electrodes 13, 14, and a second mode in which the power is applied intermittently to the electrodes 13, 14 while continuously transferring the workpiece. Such a mechanism prevents the occurrence of indentations and overheated traces, burning, burnout, and the wavy shape of a fabric, and also easily and surely bonds curvilinear portions.

Description

TITLE OF THE INVENTION
HIGH FREQUENCY SEWING MACHINE
BACKGROUND OF THE INVENTION
FIeld of the Invention
The present invention relates to a high frequency sewing machine used for producing and processing apparel products (textile products), such as women's clothing, children's clothing and men's clothing, in the following manner. That is, fabrics of natural fibers represented by cotton, wool, silk, or the like, or synthetic fibers represented by polyester, nylon, acryl, or the like (hereinafter referred to as "fiber fabrics"
in the present specification) are used as object
materials, and end portions or the like of these fiber fabrics are bonded (fused) together via a thermoplastic resin tape to be melted by high frequency dielectric heating.
Description of the Related Art
A high frequency sewing machine manufactures and processes an apparel product by bonding two fiber fabrics together by using high frequency power and a thermoplastic resin tape. The high frequency sewing machine only needs to include: (i) a conveyance means for conveying (transferring) a workpiece made up of the fiber fabric and the thermoplastic resin tape in a specific direction along a horizontal plane, (ii) a high frequency power application device that applies high frequency power between a pair of electrodes oppositely disposed above and below the thermoplastic resin tape of the workpiece conveyed by the conveyance means; and (iii) a roller device made up of a pair of upper and lower rollers havin a role in impregnating adhesive of the thermoplastic resin tape melted by the dielectric heating due to the high frequency power application, into the fiber fabric. Compared to a general sewing machine that sew fiber fabrics together by forming seams by lacing and looping sewing threads such as a needle thread (upper thread) , a looper thread, a lower thread, it is possible to omit or decrease the use of complicated mechanisms and components for forming seams with the threads, for example, feed dogs for transferring a fiber fabric in a sewing direction, a needle for allowing the sewing thread to pass through the fiber fabric, a presser foot, and a vertical reciprocating movement mechanism for the needle and the presser foot, a shuttle that supplies the lower thread for performing the lacing and looping, and an operating mechanism for the shuttle, or a looper for supplying the looper thread and an operating mechanism for the looper. That is, the high frequency sewing machine facilitates to simplify and downsize the entire structure of the sewing machine.
As the high frequency sewing machine having the foregoing characteristic feature, the present applicants have already developed a high frequency sewing machine and have filed a patent application as described in Japanese Unexamined Patent Publication No. 2011-47099.
The high frequency sewing machine uses a fiber fabric as an object material and is configured as follows. That is, a workpiece having a thermoplastic resin tape interposed between overlapped portions of the fiber fabric is intermittently transferred in a specific direction along a horizontal plane on a workpiece mounting plate by using feed dogs included in a general sewing machine. Specifically, while alternately repeating transfer and transfer suspension, a pair of upper and lower electrodes are pressed so as to be contacted with both upper and lower (front and rear) surfaces of the workpiece for each transfer suspension.
In the pressed state, high frequency power is applied between the pair of electrodes so as to melt the thermoplastic resin tape by high frequency dielectric heating, so that the overlapped portions of the fiber fabric are bonded together.
In the high frequency sewing machine disclosed in Japanese Unexamined Patent Publication No. 2011-47099, the resin tape is to be melted on a unit area basis by the high frequency power applied between the pair of electrodes according to the intermittent transfer of the workpiece, and unit melted area portions are partially lapped in a transfer direction so as to ensure that an identical portion is repetitively bonded. Therefore, the overlapped portions can be bonded together approximately uniformly over a full length of the overlapped portions while using high frequency power that is relatively low.
It is ensured that the heat generated by the high frequency power is dispersed in a surface contact part of -tihe pair of electrodes without being concentrated at a minimum area, such as a line or point contact portion.
It is therefore possible to minimize the occurrence of defective portions, such as burn and burn holes (scorches) of the fiber fabric, due to the concentration of the heat of the high frequency power at the minimum area. By using the feed dogs included in the general sewing machine, the workpiece is optionally subjected to a change of direction during the transfer suspension so as to ensure not only a linear transfer but also' curvilinear transfer, thereby permitting a bonding process of the fiber fabric having a curvilinear portion.
Consequently, it is possible to obtain the effect of manufacturing and processing a satisfactorily finished apparel product even when a bonding object material is a fiber fabric that is easily affected by heat, and even when a processing object is an apparel product having many curvilinear portions.
However, with the high frequency sewing machine disclosed in Japanese Unexamined Patent Publication No. 2011-47099, the opposing surfaces of the pair of upper and lower electrodes are directly brought into contact with and pressed against both the upper and lower (front and rear) surfaces of the fiber fabric of the workpiece.
Therefore, both the front and rear surfaces of the fiber fabric are susceptible to traces due to the pressing of the electrodes (hereinafter referred to as "indentations"). In order to avoid bond leakage and poor bonding over the full length of bonding target portions, such as the overlapped portions, a unit melting area part by the pair of electrodes needs to be partially lapped in the transfer direction of the workpiece. Accordingly, the lapped portion is subjected to a larger amount of heat than a non-lapped portion, and consequently, a line-shaped overheated trace, a so-called shine (hereinafter referred to as "overheated trace") is apt to occur intermittently along a direction orthogonal to the transfer direction of the workpiece on both the front and rear surfaces of the fiber fabric. This leaves the problem that the apparel product manufactured from the fiber fabric has an unsatisfactorily finished appearance and is apt to deteriorate product value.
In order to solve the problems involved in the high frequency sewing machine disclosed in Japanese Unexamined Patent Publication No. 2011-47099, namely, the occurrence of indentations and the intermittent occurrence of the overheated trace, the present applicants have developed a high frequency sewing machine that corresponds to Japanese Patent Application No. 2012- 222519. This application has already been published under Japanese Unexamined Patent Publication No. 2014- 058148. This high frequency sewing machine includes a pair of upper and lower electrodes. At least the upper electrode is always spaced upwardly apart from the surface of the woricpiece. High frequency power of a predetermined value is to be continuously applied between the pair of electrodes while holding the pair of electrodes in a non-contact state with respect to the front surface or both the front and rear surfaces of the The high frequency sewing machine described in Japanese Unexamined Patent Publication No. 2014-058148 allows at least the upper electrode to perform a bonding operation while holding the upper electrode in the non-contact state with respect to the front surface of the workpiece (fiber fabric) . It is therefore possible to eliminate the occurrence of indentations that is one of the problems involved in the high frequency sewing machine disclosed in Japanese Unexamined Patent Publication No. 2011-47099. It is also possible to apply uniformly or approximately uniformly the heat due to the high frequency power to the full length of bonding target portions of the workpiece. It is therefore possible to eliminate the intermittent occurrence of the overheated trace that is another problem involved in the high frequency sewing machine of Japanese Unexamined Patent Publication No. 2011-47099.
However, in the high frequency sewing machine described in Japanese Unexamined Patent Publication No. 2014-058148, the pair of upper and lower electrodes are disposed oppositely with the workpiece interposed therebetween, and are always spaced apart at a constant distance. Therefore, heat generation due to the high frequency power application occurs on components other than the electrodes, such as electric wires and components adjacent to the electrodes, and the heat generation affects the surroundings thereof. This is likely to cause disadvantages, such as burning or burnout of the fiber fabric.
Further, the high frequency sewing machine disclosed in Japanese Unexamined Patent Publication No. 2014-058148 employs, as means for transferring the workpiece, a roller device made up of a pair of upper and lower rollers disposed so as to hold the workpiece from both the front and rear surfaces thereof. The workpiece is to be continuously forcedly transferred in a processing advancing direction at a constant speed by a relative rotation of the pair of upper and lower rollers of the roller device. It is therefore desirable to enhance pressing force by the rollers so that the adhesive of the thermoplastic resin tape melted by the high frequency power is easy to penetrate into the fiber fabric. When the pressing force is enhanced, the fiber fabric of the workpiece is apt to become wavy under the influence of the enhanced pressing force by the rollers.
This leaves a new problem that an apparel product to be manufactured and processed has poor finish.
SUMMARY OF THE INVENTION
The present, invention has been made in view of the above-describe*d circumstances, and an object of the present invention is to provide a high frequency sewing machine which not only eliminates the occurrence of indentations and overheated traces but also prevents poor finish due to burning, burnout, or a wavy shape of a fiber fabric, and which also easily and surely bonds curvilinear portions together.
According to the present invention, there is provided a high frequency sewing machine including: (fl a workpiece mounting plate configured to slidingly movably mount and support thereon a workpiece with a thermoplastic resin tape interposed between overlapped portions of a fiber fabric or a workpiece in which end portions of two fiber fabrics are abutted against each other and the thermoplastic resin tape is attached so as to extend over upper surfaces of abutting end portions of the two fiber fabrics; (ii) a pair of upper and lower heat resistant endless belts to convey the workpiece mounted and supported on a mounting surface of the workpiece mounting plate in a specific direction along a
B
horizontal plane while holding the workpiece from above and below; (iii) a roller device including a pair of upper and lower rollers respectively disposed at locations to hold the workpiece from above and below respectively via the pair of upper and lower heat resistant endless belts, the roller device being configured to forcedly transfer the workpiece in the specific direction at a constant speed by a relative rotation of the pair of upper and lower rollers; (iv) an upper electrode disposed above the workpiece mounting plate and having a function of pressing the workpiece against the mounting surface; (v) a lower electrode disposed opposite the upper electrode and below the workpiece mounting plate; (vi) a high frequency power application device configured to apply high frequency power to between the upper and lower electrodes; and (vii) a controller. The workpiece mounted and supported on the mounting surface of the workpiece mounting plate and transferred in the specific direction is subjected to the high frequency power applied from the high frequency power application device to between the upper and lower electrodes so that the thermoplastic resin tape is melted by high frequency dielectric heating so as to bond.
together the overlapped portions of the fiber fabric or the abutting end portions of the fiber fabrics with the thermoplastic resin tape interposed therebetween. The high frequency sewing machine further includes: (ix) a roller lifting mechanism to allow the upper roller of the roller device to move up and down between a location to approach and a location to separate upward with respect to the lower roller; and (x) an electrode lifting mechanism that is disposed below the workpiece mounting plate and allows the upper electrode to move up and down between a location to approach and a location to separate upward with respect to the lower electrode by vertically displacing a part of the pair of upper and lower heat resistant endless belts. The controller is configured to control switching between (I) a first bonding operation mode in which the roller lifting mechanism and the electrode lifting mechanism respectively allow the upper roller and the upper electrode to move down to the location to approach the lower roller and the location to approach the iower electrode so as to continuously apply high frequency power of a predetermined value from the high frequency power application device to between the upper and lower electx-des while continuously transferring the workptece in the specific direction., and (TI) a second bonding operation mode in which the roller lifting mechanism allows the upper roller to move up to the location to separate upward with respect to the lower roller, and the electrode lifting mechanism allows the upper electrode to intermittently move up and down between the location to separate upward and the location to approach with respect to the lower electrode so as to intermittently apply high frequency power of a predetermined value to between the upper and lower electrodes while transferring the worlcpiece in the specific direction.
The high frequency sewing machine of the present invention configured as described above makes it easier to simplify and downsize the entire structure of the sewing machine than general sewing machines. The high frequency sewing machine is also capable of dispersing the heat generated by the high frequency power to be applied between the pair of electrodes into the surface contact portions of the pair of upper and lower electrodes without being concentrated at the minimum area, such as the line or point contact portion. It is therefore ensured to minimize the occurrence of defective portions, such as burn and burn holes (scorches) of the fiber fabric, due to the concentration of the heat of the high frequency power at the minimum area. Additionally, the high frequency sewing machine ensures that the workpiece is held from above and below by the pair of upper and lower heat resistant endless belts and the workpiece is continuously passed between the pair of upper and lower electrodes together with the pair of the upper and lower endless belts. Hence, it is ensured to eliminate the occurrence of the indentations and the intermittent overheated traces due to the direct contact of the electrodes with both the front and rear surfaces of the fiber fabric of the workpiece.
Moreover, the workpiece is to be transferred by being held between the pair of upper and lower endless belts. Therefore, even when a pressing force of the upper roller of the roller device against the workpiece is set to be relatively strong so that the adhesive of the melted thermoplastic resin tape easily penetrates into the fiber fabric, it is possible to prevent the fiber fabric from becoming wavy under the pressing force.
According to the need, a control is made for switching to the second bonding operation mode in which the upper roller of the roller device is moved up to the location to separate upward with respect to the lower roller, and the high frequency power is intermittently applied between the upper and lower electrodes while the upper electrode is intermittently moved up and down with respect to the lower electrode via the partial vertical displacement of the pair of upper and lower endless belts. Consequently, a contact pressure exerted on the workpiece when the upper electrode is intermittently moved up in the second bonding operation mode becomes lower than in the first bonding operation mode in which both the upper roller and the upper electrode are in their respective descent locations. Every time the contact pressure becomes lower, an operation of turning the workpiece in an optional direction is performed to gradually turn the workpiece, thus facilitating not only linear transfer but also curvilinear transfer.
Accordingly, it is ensured to easily and surely perform bonding of curvilinear portions.
Owing to the foregoing synergism, the present invention provides the high frequency sewing machine that prevents poor finish due to the occurrence of indentations and overheated traces, and burning, burnout, or a wavy shape of the fiber fabric. Hence, an apparel product produced from the fiber fabric has an excellently finished appearance so as to enhance product value. The high frequency sewing machine is sufficiently applicable to bonding of the curvilinear portions.
In the high frequency sewing machine, the pair of upper and lower heat resistant endless belts is made of fluoride ethylene resin and is basically configured to be individually drivingly moved so that the upper and lower opposing surfaces holding the workpiece therebetween are moved at an identical speed in the specific direction. More preferably, a travel speed of the upper endless belt of the pair of upper and lower heat resistant endless belts is adjustable with respect to a travel speed of the lower endless belt.
Relative adjustments of the travel speeds of the pair of upper and lower heat resistant endless belts permit corrections to misregistration in travel direction between overlapped upper and lower fiber fabric portions.
This prevents the overlapped upper and lower fiber fabric portions from being bonded together in a misregistered state, thereby producing a more satisfactorily finished apparel product.
In the high frequency sewing machine, the electrode lifting mechanism preferably includes a push-up member to be subjected to an intermittent lifting movement in which by a combination of horizontal motion and vertical motion, the push-up member is brought into contact with a lower surface of the lower heat resistant endless belt so as to intermittently, vertically and repetitively displace the pair of upper and lower heat resistant endless belts and a part of the workpiece.
According to this embodiment, in the second bonding operation mode, the push-up member disposed below the pair of upper and lower endless belts is intermittently moved up and down so that the endless belts and the part of the workpiece are repetitively displaced so as to move the upper electrode up and down.
Therefore, the workpiece is always held between the upper electrode and the pair of upper and lower endless belts.
It is ensured to surely retain the curvilinear transfer of the workpiece due to the change of direction thereof while preventing the misregistration of the fiber fabrics of the workpiece during the second bonding operation mode. The electrode lifting mechanism using the push-up member can be easily configured by effectively using a well-known feed dog circulation driving mechanism configured to drive the feed dogs of a general sewing machine by the combination o horizontal motion and vertical motion.
In the high frequency sewing machine, when switched to the second bonding operation mode, the controller preferably performs a control under which, firstly, the roller lifting mechanism allows the upper roller to move up to the location to separate upward with respect to the lower roller, and subsequently, while retaining an ascent state of the upper roller, the lectrode lifting mechanism allows the upper electrode to intermittently move up and down with respect to the lower electrode.
According to this embodiment, when switched to the second bonding operation mode, firstly, the upper roller is moved up for the upward separation by the roller lifting mechanism. In this state, the upper electrode is then intermittently moved up and down by the electrode lifting mechanism. It is therefore possible to reduce the operating load of the electrode lifting mechanism that allows the upper electrode to intermittently move up and down. Particularly, in the electrode lifting mechanism using the push-up member, a reduction in the operating load contributes to minimizing a push-up area for the push-up member, thereby downsizing and simplifying the electrode lifting mechanism.
In the high frequency sewing machine, the high frequency power application device is preferably configured to adjust output of the high frequency power to be applied between the upper and lower electrodes so that bond strength in the overlapped portions of the S fiber fabric or the abutting end portions of the fiber fabrics is kept constant or approximately constant both in the first and second bonding operation modes.
The reason for employing the above configuration is as follows. That is, in the second bonding operation mode in which the high frequency power is intermittently applied between the upper electrode and the lower electrode, the bond strength in the overlapped portions of the fiber fabric or the abutting end portions of the fiber fabrics tends to decrease than in the first bonding operation mode in which the high frequency power is continuously applied between the upper electrode and the lower electrode. To solve this tendency, namely, in order that the bond strength in the second bonding operation mode is kept equal or approximately equal to the bond strength in the first bonding operation mode, the conveyance speed of the workpiece by the pair of endless belts is preferably lower than the conveyance speed in the first bonding strength, and the value of the high frequency power to be applied is preferably set larger. The conveyance speed of the workpiece by the pair of endless belts is suitably adjusted according to the type of the fiber fabric, or the like. It is important to always ensure equivalent or approximate equivalent bond strength irrespective of the adjustment of the conveyance speed. It is also important to prevent damage to the fiber fabric due to the occurrence of a spark between the upper and lower electrodes.
When the high frequency sewing machine is configured so that the output of the high frequency power is adjustable by comprehensively considering the foregoing points, the output of the high frequency power is also optionally adjustable according to the adjustment of the conveyance speed. This ensures that the bond strength is kept constant or approximately constant irrespective of the conveyance speed of the workpiece in the first and second bonding operation modes. This also prevents damage to the fiber fabric due to the spark.
Consequently, even when a bonding object is a workpiece including curvilinear portions and linear portions, it is ensured to uniformly or approximately uniformly bond the entire region of bonding target portions together so as to surely produce a satisfactorily finished apparel product without damage to the fiber fabric.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view showing the appearance of the entirety of a high frequency sewing machine according to an embodiment of the present invention; Fig. 2 is a left side view with partial cutaway of the entirety of the high frequency sewing machine; Fig. 3 is an enlarged cross-sectional view of major parts of a workpiece as a processing object of the high frequency sewing machine; Fig. 4 i an enlarged longitudinal sectional front view of major parts for describing major parts of the high frequency sewing machine; Fig. 5 is another enlarged longitudinal sectional front view of the major parts for describing the major parts of the high frequency sewing machine; Fig. 6 is a block diagram showing the configurations of a high frequency power application device and a control system in the high frequency sewing machine; Figs. 7(A) to 7(C) are respectively image diagrams showing bonding processing operation states in the high frequency sewing machine, specifically, Fig. 7(A) shows a first bonding operation mode, Fig. 7(B) shows a switching from the first bonding operation mode to a second bonding operation mode, and Fig. 7(C) shows the second bonding operation mode; Fig. B is a front view of an enlarged longitudinal section of major parts when the high frequency sewing machine is in the first bonding operation mode; Fig. 9 is a side view of the enlarged longitudinal section of the major parts when the high frequency sewing machine is in the first bonding operation mode; Fig. 10 is a front view of an enlarged longitudinal section of the major parts when the high frequency sewing machine is in the second bonding operation mode; and Fig. 11 is a side view of the enlarged longitudinal section of the major parts when the high frequency sewing machine is in the second bonding operation mode.
DESCRIPTION OF PREFERRED EMBODIMENTS
An embodiment of the present invention is described below with reference to the accompanying drawings -Fig. 1 is a perspective view showing the appearance of the entirety of a high frequency sewing machine according to an embodiment of the present invention. Fig. 2 is a left side view with partial cutaway of the entirety of the high frequency sewing machine. Fig. 3 is an enlarged cross-sectional view of major parts of a workpiece as a processing object of the high frequency sewing machine. Fig. 4 is an enlarged longitudinal sectional front view of major parts for describing the major parts of the high frequency sewing machine. Fig. 5 is another enlarged longitudinal sectional front view of the major parts for describing the major parts of the high frequency sewing machine; As shown in Figs. t and 2, a high frequency sewing machine 1 includes a body 2, an arm section 3, and a bed section 4.
A workpiece mounting plate (corresponding to a needle plate of a general sewing machine, and hereinafter referred to as "mounting plate") 5 that slidably and movably mounts thereon a workpiece H described later, a sliding plate 6, and an operation plate 7 are attached to an upper end part of the bed section 4. The upper surfaces of the mounting plate 5, the sliding plate 6, and the operation plate 7 are flush or approximately flush with each other. The mounting plate 5, the sliding plate 6, and the operation plate 7 are respectively made of engineering plastic that is a structural material, such as polyamide, polyacetal, ABS, or polycarbonate, and has wear resistance, corrosion resistance, electrical insulating properties, and heat resistance. As the material constituting the mounting plate 5, it is particularly preferable to use superengineering plastic composed of polyether ether ketone resin. This ensures further improvement of the heat resistance and wear resistance of the mounting plate 5, the sliding plate 6, and the operation plate 7.
The workpiece H as a processing object of the high frequency sewing machine 1 may be any one of: (i) a workpiece obtained by turning back end portions of a fiber fabric W so as to be vertically overlapped with each other, and by inserting, between the overlapped upper and lower fiber fabric parts, a hot melt (for example, the trade name "DAN-FUSE" manufactured by NITTO BOSEKI CO., LTD.) T, which is a thermoplastic resin tape wthose front and rear surfaces are formed on a bonding surface as shown in Fig. 3(A), (ii) a workpiece in which end portions of two fiber fabrics W and W are abutted against each other and the hot melt T is attached so as to extend over the upper surfaces of adjacent abutting end portions of the two fiber fabrics W and W as shown in Fig. 3(B), and (iii) a workpiece obtained by vertically overlapping end portions of two fiber fabrics W and W with each other, and by interposing the hot melt between the overlapped end portions as shown in Fig. 3 (C) The high frequency sewing machine 1 further includes a pair of upper and lower heat resistant endless belts 8 and 9, a roller device 12, an upper electrode 13, a lower electrode 14, a high frequency power application device 15 (refer to Fig. 6), and a controller 16 (refer to Fig. 6). The pair of upper and lower endless belts 8 and 9 hold from abore and below the workpiece H placed on a mounting surface of the mounting plate 5 and convey the workpiecé H in a specific direction along a horizontal plane, namely, a bonding processing direction X. The roller device 12 includes a pair of upper and lower rollers 10 and 11 respectively disposed at locations to hold the. workpiece H from above and below in the vicinity of a terminal location in the bonding processing direction X in vertically opposing approximately horizontal belt portions Ba and 9a of the pair of upper and lower endless belts B and 9. The upper electrode 13 is disposed near the roller device 12 and above the mounting plate 5 on the upstream side from the roller device 12 in the bonding processing direction X. The lower electrode 14 is disposed opposite the upper electrode 13 and below the mounting plate 5. The high frequency power application device 15 applies high frequency power between the upper electrode 13 and the lower electrode 14.
Here, the upper electrode 13 is the positive electrode, and the lower electrode 14 is the negative electrode.
The pair of upper and lower heat resistant endless belts 8 and 9 is made of fluoride ethylene resin, such as PTFE. As shown H Figs. 4 and 5, the upper endless belt B of the pair of endless belts 8 and 9 is entrained so as to ensure ctrculation movement around a driving pulley 18 secured to an output shaft 17a of a driving motor (stepping motor), a driven pulley 19 disposed above a start point on the mounting plate 5 in the bonding processing direction X, and the upper roller 10 and a plurality of guide pulleys 20 in the roller device 12. The approximately horizontal belt portion Ba between the driven pulley 19 and the upper roller 10 is configured to move in the bonding processing direction X between the mounting plate 5 and the upper electrode 13.
The lower endless belt 9 is entrained so as to ensure the circulation movement around a driving pulley 22 secured to an output shaft 21a of a driving motor (stepping motor) 21 and a plurality of guide pulleys 23.
The horizontal belt portion 9a is opposed to the approximately horizontal belt portion Ba of the upper endless belt 8 and is longer than the approximately horizontal belt portion 8a in the bonding processing direction X. The horizontal belt portion 9a is configured to move along the upper surfaces of the mounting plate 5 and the lower electrode 14 in the bonding processing direction X. With the foregoing configurations, the pair of upper and lower endless belts 8 and 9 convey the workpiece H so as to pass through the upper and lower electrodes 13 and 14 and between the upper and lower rollers 10 and 11 in the bonding processing direction X in a state in which the workpiece H is held between the approximately horizontal belt portion Ba of the upper endless belt 8 and the horizontal belt portion 9a of the lower endless belt 9.
The pair of upper and lower endless belts 8 and 9 are respectively switchable between two stages of high speed and low speed under rotational speed controls of the driving motors 17 and 21. When switched to either one of the high speed and the low speed, the vertically opposing approximately horizontal belt portions 8a and Ya are configured to move at an identical speed in the bonding prOcessing direction X. The driving motor 17 for the upper endless belt B includes a speed regulator 35 (refer to Fig. 6) that is capable of making fine adjustments (manual adjustments) of a travel speed of the upper endless belt B on the basis of a travel speed of the lower endless belt 9.
As shown in Figs. 4 and 5, the upper electrode 13 is disposed between the driven pulley 19 and the upper roller 10 and above the mounting plate 5, and is liftable between a descent location to approach the lower electrode 14 and an ascent location to separate upward with respect to the lower electrode 14 via an electrode lifting mechanism 24 described later. When the upper electrode 13 descends to the location to approach the lower electrode 14, the upper electrode 13 has a function of pressing the workpiece H conveyed while being held between the pair of upper and lower endless belts 8 and 9, against the mounting surface of the mounting plate 5.
The lower electrode 14 is secured and an electrode surface of the lower electrode 14 is flush with the mounting surface of the mounting plate 5 through a vertical through hole 5a formed in the mounting plate 5.
A preheating cartridge heater 26 is insertedly held in the lower electrode 14. The preheating cartridge heater 26 retains the lower electrode 14 at a high temperature state during the bonding operation by the high frequency power application.
The upper roller 10 of the roller device 12 is liftable between a location to approach and a location to separate upward with respect to the lower roller 11 via a roller lifting mechanism 25 described later. The lower roller 11 of the roller device 12 is rotatably journaled to a frame 29 secured to the bed section 4 below the mounting plate 5 so that an outer circumferential surface of the lower roller 11 is brought into contact with a lower surface of the lower endless belt 8 through a through hole 5b formed in the mounting plate 5.
With the foregoing configurations, when the upper roller 10 descends to the location to approach the lower roller 11, the roller device 12 elastically presses the workpiece H, which is conveyed while being held between the pair of upper and lower endless belts 8 and 9, at a constant pressure or above between the upper roller 10 and the lower roller 11 via a spring 28 interposed between a roller attachment block 26 and a support frame 27 of the upper electrode 13, thereby ensuring that the fiber fabric W is impregnated with the adhesive of the thermoplastic resin tape T in the workpiece H melted by the high frequency dielectric heating.
The roller lifting mechanism 25 includes a lifting shaft 30 extending upward from the roller attachment block 26, and a lifting driving mechanism incorporated into the arm section 3 so as to vertically drivingly lift the lifting shaft 30. The lifting driving mechanism of the roller lifting mechanism 25 has a configuration similar to a presser foot lifting mechanism employed for lifting a presser foot of a general sewing machine. The presser foot lifting driving mechanism is used directly as the roller lifting mechanism 25. The presser foot lifting driving mechanism of the general sewing machine is well known, and therefore, specific configuration description and illustration of the roller lifting mechanism 25 are omitted here.
Although the present embodiment employs the presser foot lifting driving mechanism of the general sewing machine as the roller lifting mechanism 25, this presser foot lifting drivin mechanism may be replaced with a roller lifting mechanism dedicated for a high frequency sewing machine.
The electrode lifting mechanism 24 includes a push-up member 3] disposed in the vicinity of the upstream side of the lower electrode 14, and a motion mechanism as a combination of horizontal motion and vertical motion (combined motion mechanism) incorporated into the bed section 4. The motion mechanism of the electrode lifting mechanism 24 allows the push-up member 31 to be intermittently moved up and down through the vertical through hole 5a formed in the mounting plate 5.
The combined motion mechanism of the electrode lifting mechanism 24 has a configuration similar to a combined motion mechanism for feed dogs that intermittently transfer a fabric in the general sewing machine. This combined notion mechanism is used directly as the electrode lifting mechanism 24. This combined motion mechanism is well known, and therefore, specific
configuration description and illustration of the
electrode lifting mechanism 24 are omitted here.
Although the present embodiment employs the combined motion mechanism for the feed dogs in the general sewing machine as the electrode lifting mechanism 24, this combined motion mechanism may be replaced with an electrode lifting mechanism dedicated for the high frequency sewing machine.
In a state in which an upper end of the push-up member 31 of the electrode lifting mechanism 24 is in contact with the lower surface of the lower endless belt 9, the push-up member 31 is moved up and down so as to intermittently, vertically and repetitively displace the approximately horizontal belt portions 8a and 9a of the pair of upper and lower endless belts 8 and 9 and a part of the workpiece H. The repetitive displacement allows the upper electrode 13 to be intermittently moved up and down between the location to approach and the location to separate upward with respect to the lower electrode 14.
The arm section 3 includes therein a double acting cylinder (not shown) vertically operable in a posture approximately parallel to the lifting shaft 30.
A stopper member 33 is secured to a lower end of a lower cylinder rod 32 of the double acting cylinder. The stopper member 33 is brought into contact with a top surface of the support frame 27 of the upper electrode 13 so as to regulate an upward movement (ascent) of the upper electrode 13.
The push-up member 31 of the electrode lifting mechanism 24 is formed in a plate shape having a slightly smaller width than a lateral width of each 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 controller 16 are described below.
As shown in Fig. 6, the high frequency power application device 15 includes a high frequency oscillator 40, a high frequency adjustment device 41, a control circuit 42 to control output of high frequency power, and an output adjustment section 43 for high frequency power. The high frequency power application device 15 is configured to continuously or intermittently apply high frequency power of a predetermined value between the upper and lower electrodes 13 and 14 during the bonding processing operation.
Besides the foregoing components, the high frequency sewing machine 1 of the present embodiment includes a pedal 44 and a knee switch 45. The pedal 44 is to rotate and stop the driving motors 17 and 21 in the pair of upper and lower endless belts 8 and 9. The pedal 44 is also to switch the rotation speed of the driving motors 17 and 21 between high speed and low speed. The knee switch 45 is to activate and stop the roller lifting mechanism 25 and the electrode lifting mechanism 24. A pedal forward signal and a pedal back signal of the pedal 44, and an on signal and an off signal of the knee switch are to be inputted to the controller 16. The controller 16 is to output an operation control signal to each of the control circuit 42 of the high frequency power application device 15, the driving motors 17 and 21, the electrode lifting mechanism 24, and the roller lifting mechanism 25.
When the pedal forward signal/pedal back signal of the pedal 44, and the on/off signal of the knee switch are inputted to the controller 16 in the high frequency sewing machine having the foregoing configurations, the controller 16 outputs the operation control signal to each of the control circuit 42, the driving motors 17 and 21, the electrode lifting mechanism 24, and the roller lifting mechanism 25 so as to ensure switching between a first bonding operation mode and a second bonding operation mode described later.
The bonding operation of the high frequency sewing machine 1 according to the present invention is described in detail with reference to Figs. 7(A) to 7(0), Figs. 8 and 9, and Figs. 10 and 11.
In the first bonding operation mode, when the pedal 44 is pedaled, the pedal forward signal is inputted to the controller 16. In respOnse to this, the driving motors 17 and 21 starts to rotate so as to control the pair of upper and lower endless belts 8 and 9 at a travel speed on a high speed side. As shown in Fig. 7(A) and Figs. 8 and 9, the upper roller 10 of the roller device 12 descends to the location to approach the lower roller 11 via the roller lifting mechanism 25, and the upper electrode 13 remains at the location to approach the lower electrode 14 via the electrode lifting mechanism 24.
In this state, the workpiece H mounted and supported on the mounting plate 5, the sliding plate 6, and the operation plate 7 is continuously linearly transferred at high speed in the bonding processing direction X while being held between the pair of upper and lower endless belts 8 and 9. When the workpiece H is passed between the upper and lower electrodes 13 and 14, the high frequency power of a predetermined value is applied from the high frequency power application device 15 to between the upper and lower electrodes 13 and 14 so as to melt the thermoplastic resin tape T of the workpiece H by the high frequency dielectric heating.
Thereafter, when the workpiece H including the melted thermoplastic resin tape T is passed between the pair of upper and lower rollers 10 and 11 of the roller device 12, the adhesive of the thermoplastic resin tape T melted under the. pressure exerted on the workpiece H penetrates into the abutting end portions or overlapped portions of the fiber fabrics W and VI so as to bond the fiber fabrics W and W together. The pedal 44 remains pedaled until termination of the linear bonding operation in the first bonding operation mode. When the pedal 44 is replaced, the pedal back signal is inputted to the controller 16, and consequently the rotations of t.he driving motors 17 and 21 are stopped to stop the pair of upper and lower endless belts B and 9.
In the second bonding operation mode, when the knee swit.ch 45 is turned to ON, the ON signal is inputted tb the controller 16. Upon this, the roller lifting mechanism 25 is activated so that the upper roller 10 of the roller device 12 ascends to the location to separate upward with respect to the lower roller 11 as shown in Fig. 7 (B) . Subsequently, when the pedal 44 is pedaled and the pedal forward signal is inputted to the controller 16, the electrode lifting mechanism 24 is activated. According to the intermittent lifting movement of the push-up member 31 of the electrode lifting mechanism 24, the pair of upper and lower endless belts 8 and 9 and the part of the workpiece H are intermittently, vertically and repetitively displaced as shown in Fig. 7(C) and Figs. 10 and 11. According to the repetitive displacement, the upper electrode 13 is intermittently moved up and down between the location to separate upward and the location to approach with respect to the lower electrode 14. At the same time, the driving motors 17 and 21 start to rotate so as to control the pair of upper and lower endless belts 8 and 9 at a travel speed on a low speed side. In this state, the workpiece H mounted and supported on the mounting plate 5, the sliding plate 6, and the operation plate 7 is transferred at low speed in the bonding processing direction X while being held between the pair of upper and lower endless belts 8 and 9. Every time the upper electrode 13 intermittently descends to the location to approach the lower electrode 14 when the workpiece H is passed between the upper and lower electrodes 13 and 14, the high frequency power of a predetermined value is applied from the high frequency power application device 15 to between the upper and lower electrodes 13 and 14 so as to melt the thermoplastic resin tape T of the workpiece H by the high frequency dielectric heating. In the second bonding operation mode, the travel speed of the workpiece H transferred by being held between the pair of upper and lower endless belts 8 and 9 is low. Hence, only the intermittent application of the high frequency power ensures that the thermoplastic resin tape T is continuously melted in the bonding processing direction X. Consequently, the adhesive of the thermoplastic resin tape T uniformly penetrates into the entire region of the abutting end portions or overlapped portions of the fiber fabrics W and W so as to firmly bond the fiber fabrics W and W together.
Also in the second bonding operation mode, the upper roller 10 remains at the location to separate upward with respect to the lower roller 11. During the time that the upper electrode 13 intermittently ascends to the location to separate upward with respect to the lower electrode 14, the workpiece H is subjected to a lower contact pressure than that in the first bonding operation mode. Therefore, an operator manually turns the workpiece H in an optional direction every time the contact pressure is lowered. This ensures that the workpiece H is gradually turned to be easily subjected to the curvilinear transfer, thereby allowing even curvilinear portions to be easily and surely bonded together.
After the bonding operation, the pedal 44 is replaced, and the pedal back signal is inputted to the controller 16. Upon this, the pair of upper and lower endless belts 8 and 9 stop moving, Subsequently, the pedal 44 is pedaled again and the pedal forward signal is inputted to the controller 16, so that the upper electrode 13 and the upper roller 10 are moved up. In this state, a processed product in which the overlapped portions or abutting end portions of the fiber fabrics W and W are bonded together with the thermoplastic resin tape T is removable from the high frequency sewing machine 1.
As described above, the high frequency power of the predetermined value is applied between the pair of upper and lower electrodes 13 and 14 in the first bonding operation mode and the second bonding operation mode.
The term "predetermined value" is a value being necessary and sufficient in order that the pair of electrodes 13 and 14 subjected to the dielectric heating melts the thermoplastic resin tape T so as to bond the overlapped end portions of the fiber fabrics W together. Such a value is to be preset according to the heat resistance of the fiber fabric W as the bonding processing object.
Particularly, in the second bonding operation mode in which the high frequency power is intermittently applied between the upper electrode 13 and the lower electrode 14, the bond strength in the overlapped portions or abutting end portions of the fiber fabrics tends to decrease than in the first bonding operation mode in which the high frequency power is continuously applied between the upper electrode 13 and the lower electrode 14. To solve this tendency, namely, in order that the bond strength in the second bonding operation mode is kept equal or approximately equal to the bond strength in the first bonding operation mode, the conveyance speed of the workpiece H by the pair of endless belts 8 and 9 is preferably lower than the conveyance speed in the first bonding strength, and the value of the high frequency power to be applied in the second bonding operation mode is preferably set slightly larger than in the first bonding operation mode.
The conveyance speed of the workpiece H by the pair of endless belts 8 and 9 is suitably adjustable according to, for example, the kind of the fiber fabric.
When adjusting the conveyance speed of the workpiece H, the output of the high frequency power needs to be optionally adjusted according to the adjusted conveyance speed via the output adjustment section 43. This always ensures the equivalent or approximate equivalent bond strength irrespective of the adjustment of the conveyance speed of the workpiece H. This also prevents damage to the fiber fabric due to the occurrence of a spark between the upper and lower electrodes13 and. 14 in the second bonding operation mode in which the upper and lower electrodes 13 and 14 are intermittently separated from each other.
Consequently, even when the bonding object is a workpiece including curvilinear portions and linear portions and the workpiece is conveyed.at any speed, it is ensured to uniformly or approximately uniformly bond the entire region of bonding targets together so as to surely produce a satisfactorily finished apparel product without damage to the fiber fabric.
The high frequency sewing machine 1 of the present embodiment as described above in detail makes it easier to simplify and downsize the entire structure of the sewing machine than the general sewing machine. The high frequency sewing machine 1 is also capable of dispersing the heat generated by the high frequency power to be applied between the pair of electrodes into the surface contact portions of the pair of upper and lower electrodes 13 and 14 without being concentrated at the minimum area, such as the line or point contact portion.
It is therefore ensured to minimize the occurrence of defective portions, such as burn and burn holes (scorches) of the fiber fabric, due to the concentration of the heat of the high frequency power at the minimum area. Additionally, the high frequency sewing machine 1 ensures that the workpiece H is held from above and below by the pair of upper and lower heat resistant endless belts 8 and 9 and the workpiece H is continuously passed between the pair of upper and lower electrodes 13 and 14 together with the pair of the upper and lower endless belts 8 and 9. Hence, it is ensured to eliminate the occurrence of the indentations and the intermittent overheated traces due to the direct contact of the electrodes 13 and 14 with both the front and rear surfaces of the fiber fabric of the workpiece H. Moreover, the workpiece H is to be transferred by being held between the pair of upper and lower endless belts 8 and 9. Therefore, even when the pressing force of the upper roller 10 of the roller device 12 against the workpiece H is set to be relatively strong so that the adhesive of the melted thermoplastic resin tape T easily penetrates into the fiber fabric, it is possible to prevent the fiber fabric from becoming wavy under the pressing force. Consequently, the apparel product produced from the fiber fabric has an excellently finished appearance so as to enhance product value.
The suitable combination of the foregoing first and second bonding operation modes ensures an easy and sure bonding processing suitable for linear portions and curvilinear portions of a workpiece even when the workpiece includes any type of bonding target portions made up of a straight line and a curved line, such as a sequence of a linear portion and a curvilinear portion, a sequence of a curvilinear portion and a linear portion, a sequence of a linear portion, a curvilinear portion, and a linear portion, or a sequence of a curvilinear portion, a linear portion, and a curvilinear portion.
The high frequency sewing machine 1 of the present embodiment further includes the speed adjustment section 35 that permits the adjustment of the travel speed of the upper endless belt 8 of the pair of upper and lower heat resistance endless belts 8 and 9 with respect to the travel speed of the lower endless belt 9.
By suitably operating the speed adjustment section 35 so as to perform relative adjustments of the travel speeds of the pair of upper and lower heat resistant endless belts 8 and 9, it is ensured to correct the misregistration in the transfer direction of the overlapped upper and lower fiber fabric portions. This prevents the upper and lower fiber fabric portions to be bonded together in the misregistered state, thereby obtaining a further excellently finished apparel product.
The high frequency sewing machine 1 of the present embodiment employs the mechanism using the push-up member 31 as the electrode lifting mechanism 24. By the combination of the horizontal motion and the vertical motion, the push-up member 31 is brought into contact with the lower surface of the lower heat resistant endless belt 9 so as to perform the intermittent lifting movement so that the pair of upper and lower heat resistant endless belts 8 and 9 and the part of the workpiece H are intermittently, vertically and repetitively displaced. This permits the effective use of the well-known feed dog circulation driving mechanism configured to drive the feed dogs of the general sewing machine by the combination of the horizontal motion and the vertical motion, thus leading to a simple and compact structure.
According to the switching from the first bonding operation mode to the second bonding operation mode, the high frequency sewing machine 1 of the present embodiment is configured to perform the following controls. That is, under the controls, firstly, the roller lifting mechanism 25.allows the upper roller 10 to move up to the location to separate upward with respect to the lower roller 11 and, while maintaining the raised state of the upper roller 10, the electrqde lifting mechanism 24 allows the upper electrode 13 to intermittently move up and down with respect to the lower electrode 14.
Thus, when switched to the second bonding operation mode, firstly, the upper roller 10 is moved up for the upward separation by the roller lifting mechanism 25. In this state, the upper electrode 14 is then intermittently moved up and down by the electrode lifting mechanism 24. It is therefore possible to reduce the operating load of the electrode lifting mechanism 24 than being moved up and down together with the upperroller 10. Particularly, in the electrode lifting mechanism 24 using the push-up member 31, the reduction in the operating load contributes to minimizing the push-up area for the push-up member 31, thereby downsizing and simplifying the electrode lifting mechanism 24.
In the high frequency sewing machine 1 of the present embodiment, the preheating cartridge heater 26, which retains the lower electrode 14 at the high temperature state during the bonding operation due to the high frequency power application, is insertedly held in the lower electrode 14. This ensures that the lower electrode 14 is preheated so as to always retain the workpiece 1-I at high temperatures. It is therefore ensured to prevent the occurrence of a spark by setting the high frequency power applied between the pair of upper and lower electrodes 13 and 14 as low as possible.
It is also ensured to surely and quickly melt the thermoplastic resin tape T so that the predetermined bonding processing is always efficiently and stably performed.
According to the present embodiment, the mounting plate 5, the sliding plate 6, the operation plate 7, and the like are made of the material, with excellent wear resistance, electric insulation, and heat resistance, such as engineering plastic or superengineering plastic. This ensures sufficient structural strength of the mounting plate 5, the sliding plate 6, and the operation plate 7. Moreover, excellent wear resistance, corrosion resistance, electric insulation and heat resistance ensures high durability of the individual members to be used under the condition of high frequency power application.

Claims (10)

  1. CLAIMS1. A high frequency sewing machine comprising: a workpiece mounting plate configured to slidingly movably mount and support thereon a workpiece with a thermoplastic resin tape interposed between overlapped portions of a fiber fabric or a workpiece in which end portions of two fiber fabrics are abutted against each other and the thermoplastic resin tape is attached so as to extend over upper surfaces of abutting end portions of the two fiber fabrics; a pair of upper and lower heat resistant endless belts configured to convey the workpiece mounted and supported on a mounting surface of the workpiece mounting plate in a specific direction along a horizontal plane while holding the workpiece from above and below; a roller device comprising a pair of upper and lower rollers respectively disposed at locations to hold the workpiece from above and below respectively via the pair of upper and lower heat resistant endless belts, the roller device being configured to forcedly transfer the workpiece in the specific direction at a constant speed by a relative rotation of the pair of upper and lower rollers; an upper electrode disposed above the workpiece mounting plate and having a function of pressing the workpiece against the mounting surface; a lower electrode disposed opposite the upper electrode and below the workpiece mounting plate; a high frequency power application device configured to apply high frequency power to between the upper and lower electrodes; and S a controller, wherein the workpiece mounted and supported on the mounting surface of the workpiece mounting plate and transferred in the specific direction is subjected to the high frequency power applied from the high frequency power application device to between the upper and lower electrodes, so that the thermoplastic resin tape is melted by high frequency dielectric heating so as to bond the overlapped portions of the fiber fabric or the abutting end portions of the fiber fabrics with the thermoplastic resin tape interposed therebetween, the high frequency sewing machine comprising: a roller lifting mechanism configured to allow the upper roller of the roller device to move up and down between a location to approach and a location to separate upward with respect to the lower roller; and an electrode lifting mechanism that is disposed below the workpiece mounting plate and allows the upper electrode to move up and down between a location to approach and a location to separate upward with respect to the lower electrode by vertically displacing a part of the pair of upper and lower heat resistant endless belts, wherein the controller is configured to control switching between (i) a first bonding operation mode in which the roller lifting mechanism and the electrode lifting mechanism respectively allow the upper roller and the upper electrode to move down to the location to approach the lower roller and the location to approach the lower electrode so as to continuously apply high frequency power of a predetermined value from the high frequency power application device to between the upper and lower electrodes while continuously transferring the workpiece in the specific direction, and (ii) a second bonding operation mode in which the roller lifting mechanism allows the upper roller to move up to the location to separate upward with respect to the lower roller, and the electrode lifting mechanism allows the upper electrode to intermittently move up and down between the location to separate upward and the location to approach with respect to the lower electrode so as to Intermittently apply high frequency power of a predetermined value to between the upper and lower electrodes while transferring the workpiece in the specific direction.
  2. 2. The high frequency sewing machine according to claim 1, wherein the pair of upper and lower heat resistant endless belts are made of fluoride ethylene resin and are configured to be individually drivingly moved so that upper and lower opposing surfaces of the endless belts holding the workpiece therebetween are moved at an identical speed in the specific direction.
  3. 3. The high frequency sewing machine according to claim 1 or claim 2, further comprising a speed adjustment section configured to adjust a travel speed of the upper endless belt of the pair of upper and lower heat resistance endless belts with respect to a travel speed of the lower endless belt.
  4. 4. The high frequency sewing machine according to any preceding claim, wherein the workpiece mounting plate and a plate part located around the workpiece mounting plate are made of a material excellent in wear resistance, electric insulation, and heat resistance, including engineering plastic or superengineering plastic.
  5. 5. The high frequency sewing machine according to any preceding claim, the electrode lifting mechanism comprises a push-up member configured to be subjected to an intermittent lifting movement in which by a combination of horizontal motion and vertical motion, the push-up member is brought into contact with a lower surface of the lower heat resistant endless belt so as to intermittently, vertically and repetitively displace the pair of upper and lower heat resistant endless belts and a part of the workpiece.
  6. 6. The high frequency sewing machine according to any preceding claim, wherein when switched to the second bonding operation mode, the controller is configured to perform a control under which, firstly, the roller lifting mechanism allows the upper roller to move up to the location to separate upward with respect to the lower roller, and subsequently, while retaining an ascent state of the upper roller, the electrode lifting mechanism allows the upper electrode to intermittently move up and down with respect to the lower electrode.
  7. 7. The high frequency sewing machine according to any one of claims 1 to 5, wherein the high frequency power application device is configured to adjust output of the high frequency power to be applied between the upper and lower electrodes so that bond strength in the overlapped portions of the fiber fabric or the abutting end portions of the fiber fabrics is kept constant or approximately constant in both the first and second bonding operation modes.
  8. 8. The high frequency sewing machine according to any preceding claim, wherein the lower electrode holds a preheating cartridge heater for retaining the lower electrode in a high temperature state.
  9. 9. A high frequency sewing machine substantially as described herein with reference to the described embodiments.
  10. 10. A high frequency sewing machine substantially as described herein with reference to the drawings.
GB1416749.8A 2013-09-21 2014-09-22 High frequency sewing machine Active GB2520600B (en)

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JP2015061743A (en) 2015-04-02
TWI647354B (en) 2019-01-11
CN104512034B (en) 2018-05-08
CN104512034A (en) 2015-04-15
TW201520394A (en) 2015-06-01
GB201416749D0 (en) 2014-11-05
JP6164525B2 (en) 2017-07-19

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