JP3940600B2 - Horizontal sealer biting detection device and biting detection method in bag making and filling machine - Google Patents

Horizontal sealer biting detection device and biting detection method in bag making and filling machine Download PDF

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Publication number
JP3940600B2
JP3940600B2 JP2001400756A JP2001400756A JP3940600B2 JP 3940600 B2 JP3940600 B2 JP 3940600B2 JP 2001400756 A JP2001400756 A JP 2001400756A JP 2001400756 A JP2001400756 A JP 2001400756A JP 3940600 B2 JP3940600 B2 JP 3940600B2
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JP
Japan
Prior art keywords
sealer
biting
seal
detection
horizontal sealer
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Expired - Lifetime
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JP2001400756A
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Japanese (ja)
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JP2003200911A (en
Inventor
慎 栗林
哲 星野
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Tokyo Automatic Machinery Works Ltd
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Tokyo Automatic Machinery Works Ltd
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Priority to JP2001400756A priority Critical patent/JP3940600B2/en
Publication of JP2003200911A publication Critical patent/JP2003200911A/en
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Publication of JP3940600B2 publication Critical patent/JP3940600B2/en
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    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7373—Joining soiled or oxidised materials
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B29C65/7451—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
    • 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
    • B29C66/40—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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • 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
    • B29C66/723—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 being multi-layered
    • 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
    • B29C66/822—Transmission mechanisms
    • B29C66/8225—Crank mechanisms
    • 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
    • B29C66/8246—Servomechanisms, e.g. servomotors
    • 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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83541—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • B29C66/83543—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement cooperating flying jaws
    • 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
    • B29C66/849—Packaging machines
    • B29C66/8491—Packaging machines welding through a filled container, e.g. tube or bag
    • 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
    • B29C66/922—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 measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9221—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 measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power
    • B29C66/92211—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 measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power with special measurement means or methods
    • 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
    • B29C66/9241—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 pressure, the force or the mechanical power
    • 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
    • B29C66/9241—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 pressure, the force or the mechanical power
    • B29C66/92441—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 pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time
    • B29C66/92443—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 pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile
    • 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
    • B29C66/9241—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 pressure, the force or the mechanical power
    • B29C66/92441—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 pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time
    • B29C66/92443—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 pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile
    • B29C66/92445—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 pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile by steps
    • 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
    • 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
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • B29C66/9292—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges in explicit relation to another variable, e.g. pressure diagrams
    • B29C66/92921—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges in explicit relation to another variable, e.g. pressure diagrams in specific relation to time, e.g. pressure-time diagrams
    • 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
    • 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
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
    • B29C66/9392—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges in explicit relation to another variable, e.g. speed diagrams
    • 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
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Package Closures (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は製袋充填機に係わり、特にその横シーラによる被包装品の噛み込みの有無を検出する噛み込み検出装置および噛み込み検出方法に関する。
【０００２】
【従来の技術】
横シーラの噛み込み検出に関する技術は、例えば特開平７−１８７１５３号公報および特開２００１−４８１３０号公報等に記載されている。これら従来技術は、包材筒の横シール時に生じる夾雑物からの反発力を利用して噛み込みの有無を検出するものである。
【０００３】
このうち前者の技術は、被包装物が無い状態で横シールしたときの横シーラの位置を記憶しておき、この位置と夾雑物によりシーラ駆動手段に負荷トルクが発生したときの横シーラの位置とを比較して夾雑物の有無を検出する。一方、後者の技術は、夾雑物の反発力により生じるシール駆動手段の遅れからその有無を検出する。
【０００４】
【発明が解決しようとする課題】
しかしながら、被包装品である夾雑物には横シーラの噛み込みにより容易に破砕されるものがある。このため横シール時に夾雑物が早々に破砕されてしまえば、もはやその反発力は生じない。あるいは破砕されにくい夾雑物であっても、横シール時に包材は溶融するため、その溶融層に夾雑物が早々に埋もれてしまうと同じくその反発力は生じない。
【０００５】
上述した従来技術では夾雑物からの反発力を利用して噛み込みを検出しているため、夾雑物の破砕や包材への埋没によりその反発力が生じない場合は検出ができなくなるという問題がある。このような問題は、特に微小な夾雑物の場合に顕著であり、夾雑物が微小である場合は横シーラへの反発力がほとんど生じないため噛み込み検出が極めて困難となる。
【０００６】
そこで本発明は、夾雑物が微小であったり、あるいは横シール時に破砕されたり、包材に埋没したりしやすい場合であっても、確実にその噛み込みの有無を検出することができる製袋充填機における横シーラの噛み込み検出装置およびその噛み込み検出方法の提供を課題とする。
【０００７】
【課題を解決するための手段】
本発明の噛み込み検出装置（請求項１）は、横シーラの開閉動作に伴い、その開閉ストローク中における位置情報を検出する位置検出手段と、横シーラのシール圧を時間の経過とともに段階的に変化させるシール圧調整手段と、このシール圧の変化に伴う横シーラの位置情報の変化に基づき、横シーラによる被包装品の噛み込みの有無を検出する噛み込み検出手段とを備えている。
【０００８】
シール圧を段階的に変化させることで、夾雑物が有る場合と無い場合とでシール中の横シーラの位置に顕著な変化が現れる。この特性を利用して、噛み込み検出手段は噛み込みの有無を検出することができる。このため、例えば破砕され易い夾雑物や包材の溶融層に埋もれるような夾雑物、あるいは微小な夾雑物であっても、その破砕や埋没等の変化を生じる前の段階で噛み込みの有無を確実に検出することができる。
【０００９】
更に、請求項１の場合、シール圧調整手段はシール圧を時間の経過とともに２段階に変化させ、先の第１段階目のシール圧を被包装物の物性に応じて設定される検出用シール圧とし、後の第２段階目のシール圧を溶着用シール圧として横シールを行う。この場合、被包装物の物性に応じて検出用シール圧を適切に設定することで夾雑物の破砕や包材への埋没等を抑えることができる。
【００１０】
より具体的には、被包装品の物性がその破砕強度により与えられており、シール圧調整手段は被包装品の破砕強度に応じて検出用シール圧を溶着用シール圧よりも弱く設定したり（請求項２）、あるいは被包装品の破砕強度に応じて検出用シール圧を溶着用シール圧よりも強く設定したりする（請求項３）。例えば、被包装品の破砕強度が比較的低いものである場合、弱い検出用シール圧を与えることで夾雑物の破砕を防止する。一方、被包装品の破砕強度が比較的高い場合、溶融の前に強い検出用シール圧を与えて夾雑物が包材の溶融層に埋もれないようにその噛み込みを検出する。これら噛み込み検出手法は夾雑物が微小である場合に特に有効である。
【００１１】
本発明の噛み込み検出装置（請求項４）は、より実用的な構成をとることができる。具体的には、横シーラを開閉作動させる駆動手段は所定の位置指令パルスに基づいて駆動されるサーボモータを含む。また位置検出手段はサーボモータの回転角位置を表す帰還パルスを出力するエンコーダを含み、その帰還パルスに基づいて位置情報を検出する。
【００１２】
この場合、横シール中は夾雑物の有無により位置情報に違いが現れるので、噛み込み検出手段は位置情報の違いを利用して噛み込みの有無を検出することができる。
あるいは、噛み込み検出手段は横シーラが閉位置にある間に入力された帰還パルスの総数に基づき噛み込みの有無を検出することもできる（請求項５）。この場合、夾雑物の物性により、瞬間的に位置情報に違いが現れにくいものであっても、シール期間内に噛み込みの有無による位置情報の差が累積されて顕著に現れるため、その累積された差を利用して噛み込みを検出することができる。
【００１３】
上述した噛み込み検出装置を用いて実施される噛み込み検出方法（請求項６）は、横シーラの開閉ストローク中における位置情報を検出しながら、横シーラの閉動作時に包材筒に与えるシール圧を時間の経過とともに２段階的に変化させ、先の第１段階目のシール圧を被包装物の物性に応じて設定される検出用シール圧とし、後の第２段階目のシール圧を溶着用シール圧として横シールを行わせることで、このシール圧の変化に伴う位置情報の変化に基づき、横シーラによる被包装品の噛み込みの有無を検出するものとなる。
【００１４】
【発明の実施の形態】
本発明は例えば、粉粒体やスナック菓子等の食品類を縦ピロー包装する縦型製袋充填機に適用することができる。ただし、本発明の用途が特定の製袋充填機に限定されるものではなく、また、被包装品が粉粒体または食品類に限定されるものでもない。
【００１５】
図１は、本発明の一実施形態に係る縦型製袋充填機を概略的に示している。縦型製袋充填機は鉛直に延びる充填チューブ２を備えており、この充填チューブ２の上部にはフォーマ６が設けられている。
被包装品が粉粒体である場合、充填チューブ２内にはオーガスクリューが回転可能に収容されており、充填チューブ２の上端は粉粒体の供給を受けるホッパ（いずれも図示されていない）に接続されている。あるいは、被包装品がスナック菓子等の固形物である場合、充填チューブ２の内部は中空であり、その上端は供給ホッパおよび計量器（いずれも図示されていない）に接続されている。
【００１６】
また縦型製袋充填機はフィルムロールＦＲを備えており、このフィルムロールＦＲから長尺なフィルム包材Ｆが引き出されている。フィルム包材ＦはフィルムロールＦＲから多数のガイドローラを介して充填チューブ２まで導かれ、そしてフィルム包材Ｆはフォーマ６に案内されて充填チューブ２の周りに円筒状に成形され、両側縁が互いに重ね合わせられた状態で下方に引き出されている。
【００１７】
フィルム包材Ｆの繰り出しに関して詳述すると、フィルム包材ＦはそのフィルムロールＦＲから充填チューブ２に向けて繰り出されている。繰り出し経路の途中にフィードローラ１０が配置されており、フィルム包材Ｆはフィードローラ１０の回転に伴い繰り出し経路に沿って繰り出される。
一方、充填チューブ２の両側には一対のフィードユニット１２が配置されている。各フィードユニット１２は無端状のサクションベルト１４を有しており、このサクションベルト１４は充填チューブ２に沿って延び、図示しないサーボモータ（図示しない）により一方向に走行可能である。なお図１には、一方のフィードユニット１２のみが示されている。
【００１８】
一対のフィードユニット１２間には縦シーラ１６が配置されている。縦シーラ１６は一対のヒータブロック１８を有し、これらヒータブロック１８は充填チューブ２に沿って上下方向に延びている。一対のヒータブロック１８の間をフィルム包材Ｆが通過する際、その両側縁の合わせ目は相互に縦シール、つまり、ヒートシールされて所定の形態（例えば合掌張りの形態）で接着される。これによりフィルム包材Ｆは充填チューブ２の周りで包材筒Ｗとなる。
【００１９】
一方、充填チューブ２の下方には横シーラ２０が配置されている。横シーラ２０は一対のヒータブロック２２を備えており、横シーラ２０はその開閉動作に伴い、一対のヒータブロック２２を互いに接離させることができる。連続型の製袋充填機の場合、横シーラ２０は開閉動作の他に昇降動作をも伴い、それゆえ図中に２点鎖線で示されるように、横シーラ２０は開閉および昇降の動作が合わさったボックスモーションを行う。なお間欠型の製袋充填機では、横シーラ２０は開閉動作のみを行う。
【００２０】
図２は、横シーラ２０の駆動機構とその制御システムを概略的に示している。一対のヒータブロック２２は一対ずつのリンクロッド２４，２６を介して揺動レバー２８の両端にそれぞれ連結されている。揺動レバー２８のレバー軸３０はサーボモータ３２の出力軸に連結されている。したがって、サーボモータ３２はその正逆回転により、揺動レバー２８を所定の揺動角域にて揺動させ、この揺動に伴い、リンクロッド２４，２６を介してヒータブロック２２が互いに接離する。つまり、横シーラ２０はサーボモータ３２の正逆回転により、充填チューブ２の下方へ送出された包材筒Ｗに対して開閉される。
【００２１】
横シーラ２０が閉位置にあるとき、その一対のヒータブロック２２は包材筒Ｗを挟み付け、包材筒Ｗをその横断方向にヒートシール、つまり、横シールする。また、一方のヒータブロック２２にはカッタブレード（図示しない）が内蔵されており、このカッタブレードは横シールの完了後、一方のヒータブロック２２から突出し、包材筒Ｗを切断する。なお、突出したカッタブレードは他方のヒータブロック２２に形成した逃げ溝内に進入する。
【００２２】
横シーラ２０による包材筒Ｗの横シールおよび切断は、充填チューブ２から包材筒Ｗ内への被包装品の投入と交互に実施される。これにより、個々に被包装品の充填を受けた包装袋Ｂが製造されて落下する。被包装品が粉粒体の場合、オーガスクリューの回転により充填チューブ２の下端から一定量の粉粒体が包材筒Ｗ内に投入される。被包装品がスナック菓子等の固形物の場合、上述した計量器により一定量の固形物が供給ホッパ内に投下され、さらに被包装品は充填チューブ２を通じて包装筒Ｗ内に投入される。
【００２３】
この後、包装袋Ｂはシュートを介して移送コンベア上に供給され、後段の箱詰め機に向けて移送される。
上述したフィードユニット１２による包材筒Ｗの送出や粉粒体の充填動作と連動して、横シーラ２０の開閉作動を制御するため、サーボモータ３２はサーボアンプ３６を介して制御装置３８に接続されており、さらにサーボモータ３２が内蔵するロータリエンコーダ３４もまた制御装置３８に接続されている。
【００２４】
制御装置３８はＣＰＵ４０をはじめとした各種の電子回路を備えたハードウェアからなり、具体的にはタイミング監視部４２や操作部４４、計算部４６、異常出力部４８が内蔵されている。また制御装置３８には制御プログラムやデータ保存のためのＲＯＭ５０やＲＡＭ５２、設定記憶部５４等の記憶回路が内蔵されている。その他、制御装置３８には演算処理を行う噛み込み判断部５６、外部との情報のやりとりをする入力インタフェース５８および出力インタフェース６０が内蔵されている。
【００２５】
制御装置３８は出力インタフェース６０を通じてサーボアンプ３６に指令パルスを送信し、サーボアンプ３６は指令パルスに従ってサーボモータ３２を作動させる。一方、ロータリエンコーダ３４はサーボモータ３２の実回転角位置、つまり、揺動レバー２８の実揺動角に対応した位置検出信号を制御装置３８に供給する。位置検出信号は、例えば帰還パルスの形式で出力され、入力インタフェース５８を通じて制御装置３８に送信される。
【００２６】
また制御装置３８は、横シーラ２０の原点位置（開位置）を自動設定する機能をも備えている。この機能を達成するため、制御装置３８の入力インタフェース５８に原点検出器６２が接続されている。
上述のハードウェア構成を有した制御装置３８は、所定の制御プログラムを実行することにより横シーラ２０の開閉作動を具体的に制御することができる。また本制御プログラムにおいては横シーラ２０の開閉タイミングだけでなく、その閉位置において包材筒Ｗに与えるシール圧の調整も達成される。
【００２７】
さらに本制御プログラムにおいては、横シーラ２０による被包装品の噛み込みの有無を検出する機能をも有しており、以下、その制御プログラムの一例を説明する。
図３から図５は、制御プログラムの一例として挙げられる制御フローを示している。また図６および図７は、本制御プログラムの実行に伴う各種変数（Ａ〜Ｇ）の時間的変化を示している。これら図６および図７において、製袋充填機の１包装サイクルをＴとすると、１包装サイクル時間Ｔ内で各種変数（Ａ〜Ｇ）は所定のパターンで変化する。
【００２８】
本制御プログラムでは、横シーラ２０の開閉動作を二つの制御手法に分けて行うことができる。先ず一つ目が速度制御であり、これは横シーラ２０の開閉速度を目標値として指令パルスを演算し、その指令をサーボアンプ３６に出力することでサーボモータ３２の動作を制御するものである。
二つ目はトルク制御であり、これは横シーラ２０が閉位置にあるときに包材筒Ｗに与えるシール圧を目標値として指令パルスを演算し、その指令をサーボアンプ３６に出力することでサーボモータ３２の動作を制御するものである。
【００２９】
これら二つの制御の切り換えは、横シーラ２０が開動作期間Ｔ3にあるか否かによって行われる（ステップＳ１）。このため制御装置３８は、タイミング監視部４２において横シーラ２０の動作を常に監視している。図６および図７中、開動作期間Ｔ3は１包装サイクル中に横シーラ２０が閉位置から開位置までの移動する期間として規定される。
【００３０】
横シーラ２０の開閉動作が開動作期間Ｔ3内にある場合（ステップＳ１＝Ｙｅｓ）、制御プログラムにおいて速度制御が選択される（ステップＳ１３）。この場合、制御装置３８はロータリエンコーダ３４からの帰還パルスに基づいて演算処理を行い、横シーラ２０の位置を検出する（ステップＳ１４）。また制御装置３８は、速度指令値（位置指令パルス）をサーボアンプ３６に出力する（ステップＳ１５）。この結果、サーボモータ３２の動作は横シーラ２０に目標速度を与えるべく制御される。
【００３１】
横シーラ２０の開閉動作が開動作期間Ｔ3内にない場合（ステップＳ１＝Ｎｏ）、制御装置３８は横シーラ２０の位置を検出しながら（ステップＳ２）、制御切換タイミングを判定する（ステップＳ３）。制御切換タイミングは、速度制御からトルク制御への切り換えを行うべきタイミングを意味しており、このタイミングの到来は横シーラ２０の位置によって判断される。
【００３２】
図６および図７中、横シーラ２０が開位置から閉位置に到達する直前に制御切換タイミングＴｃが設定されている。この制御切換タイミングＴｃでは、サーボモータ３２が速度制御から回転トルク制御に切り換えられる。具体的には、次のいずれかのタイミングをもって制御切換タイミングＴｃとする。その第１は、図６および図７中、サーボモータ３２の回転速度モデルにおいて、回転速度が最大速度の一定割合（例えば２０％）以下まで減速した時点を制御切換タイミングＴｃとするものである。第２は、ロータリエンコーダ３４から出力される帰還パルスに基づき、横シーラ２０が閉位置の直前に到達した時点をもって制御切換タイミングＴｃとする。
【００３３】
制御切換タイミングＴｃが到来する前（ステップＳ３＝Ｎｏ）は、制御装置３８は速度制御を継続し（ステップＳ４）、サーボアンプ３６に対して速度指令値を出力する（ステップＳ５）。なお、ステップＳ４の前に噛み込み検出ルーチンＲ２が設けられているが、ここでの処理については後述する。
これに対し、制御切換タイミングＴｃが到来すると（ステップＳ３＝Ｙｅｓ）、制御装置３８は制御手法を速度制御から回転トルク制御に切り換える（ステップＳ６）。
【００３４】
図６および図７に示されるように、トルク制御への切り換え後、所定時間内に回転トルクの上昇区間Ｔ4が設けられている。この上昇区間Ｔ4では、回転トルクの理論値がサーボアンプ３６に対して指令される。回転トルクの理論値は横シール位置の変動がないものとして計算されており、具体的には回転トルクを０から上記の理論値まで徐々に立ち上げるためのものである。このような上昇区間Ｔ4を設定することにより、サーボモータ３２や横シーラ２０の駆動機構に与えられる衝撃が緩和される。すなわち、上述の制御切換タイミングＴｃから直ちに大きな回転トルクをサーボモータ３２に作用させた場合、その衝撃は過大なものとなるが、本制御では上昇区間Ｔ4を設けて徐々に回転トルクを立ち上げるものとしている。
【００３５】
また制御タイミングが上昇区間Ｔ4にあるとき（ステップＳ７＝Ｙｅｓ）、制御装置３８は回転トルクの理論値を計算する（ステップＳ８）。回転トルクの理論値は、その目標値を包材筒Ｗに与えるシール圧とすると、図２に示されるようにレバー軸３０の中心と横シーラ２０の中心とを結ぶ線と揺動レバー２８の軸線とがなす角度θから力学的に求められる。
【００３６】
図６および図７に示されるように、本制御プログラムにおいてはシール期間Ｔ2中に適正シール圧（Ｇ）の目標値を２段階に変化させている。具体的には、先の第１段階目を検出用シール圧Ｐｉとし、後の第２段階目を溶着用シール圧Ｐｍとしており、これら検出用シール圧と溶着用シール圧とで、適正シール圧に強弱が設けられている。
【００３７】
制御装置３８は、予め設定された適正シール圧（Ｇ）のパターンに基づいて回転トルクの理論値を計算し、この求めた理論値に基づき、サーボアンプ３６に回転トルク指令値を出力する（ステップＳ１１）。この結果、シール期間Ｔ2においてサーボモータ３２の動作は横シーラ２０に目標とする適正シール圧（Ｇ）を与えるべく制御される。なお、トルク制御を行う場合、上昇区間Ｔ4では回転速度制限値が合わせて出力される（ステップＳ１２）。すなわち、サーボモータ３２制御が速度制御から回転トルク制御に切り換わった後、特に横シーラ２０が閉位置に到達するまでの間にサーボモータ３２の回転速度が急激に上昇することがある。このような回転速度の急上昇を回避するため、本制御では速度制限制御を実行するものとしている。回転速度制限値は例えば、図６および図７中、回転速度モデル（Ｂ）に対応する値に設定される。
【００３８】
上昇区間Ｔ4が過ぎると（ステップＳ７＝Ｎｏ）、制御装置３８は横シーラ２０の位置を検出し（ステップＳ９）、次に噛み込み検出ルーチンＲ１を実行する。この噛み込み検出ルーチンＲ１および後述の噛み込み検出ルーチンＲ２は、横シーラ２０の閉動作時に被包装品が噛み込まれているか否かを検出するために実行される。
【００３９】
図４に示されるように、噛み込み検出ルーチンＲ１では検出方法が１または２のいずれに設定されているかが判断される（ステップＳ１０１）。なお、検出方法１，２の設定は、縦型製袋充填機の運転開始前に行われる。先ず検出方法１は、所定の判断タイミングが到来したとき（ステップＳ１０２＝Ｙｅｓ）、横シーラ２０の動作位置に関する理論値とその現在位置との比較により噛み込みの有無を判断するものである（ステップＳ１０３，Ｓ１０４）。
【００４０】
一方、検出方法２は、先ず横シーラ２０の現在位置情報の累積値を計算し（ステップＳ１０６）、そして図５に示されるように、シール期間Ｔ2から開動作期間Ｔ3への切換タイミングが到来したとき（ステップＳ２０１）、累積値と累積理論値との比較により噛み込みの有無を判断するものである（ステップＳ２０２，Ｓ２０３）。
【００４１】
噛み込み検出ルーチンＲ１から復帰すると、制御装置３８は横シーラ２０の動作区間がタイミングＴ5にあるかを判断し（ステップＳ１０７）、その結果、タイミングＴ5にあれば検出用シール圧Ｐｉによりサーボモータ３２の回転トルク制御を行う（ステップＳ１０８）。
この後、横シーラ２０の動作区間がタイミングＴ5でなくなれば（ステップＳ１０７＝Ｎｏ）、制御装置３８は溶着用シール圧Ｐｍによりサーボモータ３２の回転トルク制御を行う（ステップＳ１０９）。
【００４２】
なお、全シール期間Ｔ2においてトルク制御が実行されている間、制御装置３８は実回転トルクの計算を行う（ステップＳ１０）。
以下に、具体的な実施例を挙げて噛み込み検出装置の作動を詳しく説明する。また以下の説明により、噛み込み検出装置を用いた検出方法の内容についても明らかとなる。
【００４３】
図１の製袋充填機を用いて、袋幅１００ｍｍ、袋長２００ｍｍの包装袋を生産する。フィルム包材には、厚さ９０μｍ、幅２２５ｍｍの蒸着アルミフィルムを使用する。１包装サイクルＴの包材繰り出し長さは２００ｍｍで、生産速度は毎分６０袋とする。また、横シール時間は１８０ｎｓｅｃとする。
図８および図９は、シール期間Ｔ2の近傍における横シーラ位置の時間的な変化を示している。これら図中、横シーラ位置は縦軸の上方が開位置であり、下方が閉位置である。なお横シーラ位置は、制御装置３８に入力された帰還パルスの形式で表されている。またこれら図中、実線で示される変化は夾雑物（噛み込み）がある場合を示し、これに対し１点鎖線で示される変化は夾雑物がない場合を示している。
【００４４】
夾雑物の破砕強度が比較的高い場合（例えば微少量のコーヒー粉）、図６に示されるようにシール期間Ｔ2の最初に強いシール圧を与え、その後で弱いシール圧を与える態様が好ましい。この場合、横シーラ２０の位置変化は図８に示される傾向を示す。
図８に示されるように、先ず速度制御により横シーラ２０が閉動作され、横シーラ２０が閉位置に最も近い位置まで到達する。この後、一対のヒータブロック２２が互いに反発して横シーラ２０が開位置の方向に跳ね返っている。
【００４５】
次にトルク制御が実行されて第１段階目の検出用シール圧Ｐｉが与えられると、横シーラ２０は閉位置に近づいて安定している。このように、検出用シール圧Ｐｉが与えられている期間を以下、検出封止期間と称する。
図１０は、夾雑物Ｋの有無の違いによる横シール領域の変化を連続的に示している。夾雑物Ｋが有る場合の変化（ａ）〜（ｄ）と無い場合の変化（ｅ）〜（ｈ）とは、それぞれタイミング的に対応関係にある。
【００４６】
夾雑物Ｋが有る場合、図１０中（ｃ）に示されるように検出封止期間に強い検出用シール圧Ｐｉが与えられても、夾雑物Ｋはシーラント層Ｓに埋もれることなくシーラント層Ｓを介して基材層Ｍを外側に押し広げている。夾雑物Ｋが無い場合で同じタイミング（ｇ）の両基材層Ｍの厚みＷｓと比較すると、夾雑物Ｋが有る場合はその分だけ厚みＷａが大きい（Ｗａ＞Ｗｓ）。このため夾雑物Ｋが有る場合と無い場合とを比較すると、夾雑物Ｋが有る場合の方が横シーラ２０の位置が開位置により近いものとなる。
【００４７】
次に図１５との比較において、夾雑物Ｋがシーラント層Ｓに埋もれない理由について説明する。図１５は、従来のようにシール圧Ｐを常に一定に制御した場合の横シール領域の変化を連続的に示している。なお、図１５中（ａ）〜（ｄ）の変化は、図１０中（ａ）〜（ｄ）の変化とタイミング的に対応関係にある。
シール圧Ｐを一定に制御すると、夾雑物Ｋは横シーラ２０の閉動作初期において早々にシーラント層Ｓに埋もれ（図１５中（ｃ））、その存在により基材層Ｍを押し広げることはない。このため両基材層Ｍの厚みＷａは夾雑物Ｋが無い場合の厚みＷｓにほぼ近くなり（Ｗａ≒Ｗｓ）、これらの差は検出されにくいものとなる。
【００４８】
また、図１０中（ｃ）に示されるように検出封止期間に強い検出用シール圧Ｐｉが与えられると、二つのシーラント層Ｓが互いに強く圧着されてこれらの層厚はＸ１に圧縮される。
これに対しシール圧Ｐを一定に制御すると（図１５中（ｃ））、二つのシーラント層Ｓに与えられる圧着力は図１０（ｃ）の場合よりも弱く、その層厚はＸ２となる。このとき、シーラント層Ｓはまだ溶けておらず、層厚はシール圧Ｐｉ，Ｐの大きさに依存する。したがって、層厚Ｘ１よりも層厚Ｘ２の方が厚くなる（Ｘ１＜Ｘ２）。
【００４９】
この後、引き続き一定のシール圧Ｐを与えると、シーラント層Ｓが溶融する際に夾雑物Ｋに押し出され、溶けたシーラント材が夾雑物Ｋと基材層Ｍとの間から周囲に移動しやすい（図１５中（ｄ））。この結果、夾雑物Ｋは溶融後のシーラント層Ｓに埋もれ、基材層Ｍの外面は平坦となる。
これに対し、シーラント層Ｓが溶融する前に検出用シール圧Ｐｉを与えると、シーラント層Ｓが圧縮され（Ｘ１）、その後シーラント層Ｓが溶融し始めるが、シーラント層Ｓは層厚がＸ２の場合と異なり、夾雑物Ｋの無い方へ移動しない。すなわちシーラント層Ｓが夾雑物Ｋと基材層Ｍとの間にとどまったままとなる。このため、シーラント層Ｓは溶融後においても夾雑物Ｋと基材層Ｍとの間にとどまり、その存在により基材層Ｍの外面を膨らませる。
【００５０】
そこで、ステップＳ１０２の判断タイミングを例えば検出封止期間の終期とすると、この時点で横シーラ２０の位置に関する理論値（夾雑物Ｋ無し）と現在位置とを比較した結果、現在位置の方がより開位置に近いものであれば、ステップＳ１０４において異常（噛み込み有り）と判断することができる。
また、ステップＳ１０２の判断タイミングを例えば溶着封止期間の終期としても、この時点で横シーラ２０の位置に関する理論値（夾雑物Ｋ無し）と現在位置とを比較した結果、現在位置の方がより開位置に近いものであれば、ステップＳ１０４において異常（噛み込み有り）と判断することができる。
【００５１】
したがって、検出用シール圧Ｐｉを強く設定した場合、検出封止期間および溶着封止期間の両方で噛み込みの検出が可能となる。
この後、検出封止期間が過ぎると、図６に示されるようにトルク制御においてトルク指令値が変化し、横シーラ２０から包材筒Ｗに与えられる適正シール圧（Ｇ）は第２段階目の溶着用シール圧Ｐｍとなる。このように溶着用シール圧Ｐｍが与えられている期間を以下、溶着封止期間と称する。溶着用シール圧Ｐｍは検出用シール圧Ｐｉよりも弱く、それゆえ溶着封止期間内にシーラント層Ｓは過溶着することなく好適に横シールされる（図１０中（ｄ）（ｈ））。これにより、夾雑物Ｋが無い場合の横シール性も充分に確保される。
【００５２】
一方、夾雑物の破砕強度が比較的低い場合（例えば粉粒体）、図７に示されるようにシール期間Ｔ2の最初に弱い適正シール圧を与え、その後で強いシール圧を与える態様が好ましい。この場合、横シーラ２０の位置変化は図９に示される傾向を示す。
図９に示されるように、先ず速度制御により横シーラ２０が閉動作され、横シーラ２０が一旦閉位置に近づく。この後、一対のヒータブロック２２が互いに反発しあい、横シーラ２０が開位置の方向に跳ね返るところは図８の場合と同様である。
【００５３】
ここで、トルク制御が実行されて第１段階目の検出用シール圧Ｐｉが与えられると、検出封止期間内に横シーラ２０が僅かに閉位置に近づいて安定する。
図１１は、破砕強度が比較的低い場合の夾雑物Ｋについて、その有無の違いによる横シール領域の変化を連続的に示している。
夾雑物Ｋが有っても、最初のシール圧によって夾雑物Ｋが押しつぶされてしまうと、この後その有無を検出することは難しい。したがって、第１段階目の検出用シール圧Ｐｉを弱めに設定し、夾雑物Ｋの破砕を防止する。
【００５４】
このような夾雑物Ｋが有る場合、図１１中（ｃ）に示されるように検出封止期間に弱い検出用シール圧Ｐｉが与えられるため、夾雑物Ｋは押しつぶされることはない。さらにこのとき、横シーラ２０は夾雑物Ｋを挟み込んだ位置で安定している。夾雑物Ｋが無い場合で同じタイミング（ｇ）の両基材層Ｍの厚みＷｓと比較すると、夾雑物Ｋが有る場合はその分だけ厚みＷａが大きい（Ｗａ＞Ｗｓ）。このため夾雑物Ｋが有る場合と無い場合とを比較すると、上述した場合と同様に夾雑物Ｋが有る場合の方が横シーラ２０の位置が開位置により近いものとなる。
【００５５】
そこで図８の場合と同様に、ステップＳ１０２の判断タイミングを例えば検出封止期間の終期とすると、この時点で横シーラ２０の位置に関する理論値（夾雑物Ｋ無し）と現在位置とを比較した結果、現在位置の方がより開位置に近いものであれば、ステップＳ１０４において異常（噛み込み有り）と判断することができる。
【００５６】
この後、検出封止期間が過ぎると、図７に示されるようにトルク制御においてトルク指令値が変化し、横シーラ２０から包材筒Ｗに与えられる適正シール圧（Ｇ）は第２段階目の溶着用シール圧Ｐｍとなる。溶着用シール圧Ｐｍは検出用シール圧Ｐｉよりも強く、それゆえ溶着封止期間内にシーラント層Ｓは充分に溶着される（図１０中（ｄ）（ｈ））。これにより、夾雑物Ｋが無い場合の横シール性も充分に確保される。
【００５７】
以上は検出方法１の実施例である。次に検出方法２の実施例を説明する。
上述の検出方法１では、横シーラ２０の位置変化に関して図８と図９とを比較すると、夾雑物Ｋの破砕強度が比較的弱い場合はその有無による違いが顕著に現れにくいといえる。このため夾雑物Ｋの物性により、ステップＳ１０２において現在位置と理論値との明確な比較が困難となり、ステップＳ１０４にて異常であるか否かの判定ができない場合がある。
【００５８】
この場合、検出方法２による判断が可能となる。上述のように検出方法２ではシール期間Ｔ2から開動作期間Ｔ3への切換タイミングＴｒが到来したとき、検出封止の開始時点（Ｔ4とＴ5の間）からこの切換タイミングＴｒまでの期間の帰還パルス累積値と累積理論値との比較により噛み込みの有無を判断する。
具体的には、夾雑物Ｋが有る場合と無い場合とで帰還パルス累積値を比較した場合、個々のスキャンタイム（制御インターバル）における両者間の現在位置の僅かな差が積算して反映されるため、夾雑物Ｋが無い場合よりも有る場合の方が現在位置累積値は大きいものとなる。
【００５９】
そこで、ステップＳ２０１において切換タイミングＴｒ（Ｔ2→Ｔ3）が到来すると、この時点で横シーラ２０の位置に関する累積理論値（夾雑物Ｋ無し）と現在位置累積値とを比較した結果、現在位置累積値の方がより大きいものであれば、ステップＳ２０３において異常（噛み込み有り）と判断することができる。
図１２は、検出方法２について現在位置累積値の計測を行った実施例１〜５の結果を示している。一方、図１３はシール圧を一定に制御して現在位置累積値の計測を行った比較例１〜５の結果を示している。
【００６０】
これら図１２および図１３中、１〜５の番号は各実施例または各比較例に対応し、それぞれ左半分の５つのサンプルが夾雑物無しの場合の結果であり、右半分の５つのサンプルが夾雑物有りの場合の結果である。
実施例１〜５の結果から明らかなように、夾雑物の有無によって現在位置累積値に顕著な大小差が認められる（図１２参照）。
【００６１】
一方、比較例１〜５では夾雑物の有無によって現在位置累積値に明確な大小差が認められない（図１３参照）。したがってシール期間Ｔ2においてシール圧を一定に制御すると、横シーラ２０の位置情報に基づいて夾雑物の有無を検出することは難しいといえる。比較例の結果については、さらに以下の説明が加えられる。
【００６２】
図１４は、比較例に関する横シーラ位置の時間的な変化を示している。図１４中、実線で示される変化は夾雑物が有る場合であり、１点鎖線で示される変化は夾雑物が無い場合を示している。
比較例においても横シーラ２０が閉位置に近づき、この後、一対のヒータブロック２２が互いに反発しあって横シーラ２０は僅かに開位置に戻っている。
【００６３】
次にシール期間に移行して包材筒Ｗに一定のシール圧が与えられると、夾雑物の有無にかかわらず横シーラ２０の現在位置はほぼ同様の傾向を示している。
図１５および図１６を追加してこの点をさらに詳しく検証する。比較例のようにシール圧Ｐを一定に制御すると、夾雑物Ｋの破砕強度が比較的高い場合、横シール領域の変化は図１５に示されるものとなる。すなわち、夾雑物Ｋは横シーラ２０の閉動作初期において早々にシーラント層Ｓに埋もれ（図１５中（ｃ））、その存在により基材層Ｍを押し広げることはない。このため両基材層Ｍの厚みＷａは夾雑物Ｋが無い場合の厚みＷｓにほぼ近くなり（Ｗａ≒Ｗｓ）、これらの差は検出されにくいものとなる。
【００６４】
一方、夾雑物Ｋの破砕強度が比較的低い場合、横シール領域の変化は図１６に示されるものとなる。この場合、夾雑物Ｋは横シーラ２０の閉動作初期において容易に破砕してしまう（図１６中（ｃ））。このため同様に、両基材層Ｍの厚みＷａは夾雑物Ｋが無い場合の厚みＷｓにほぼ近くなり（Ｗａ≒Ｗｓ）、これらの差はほとんど検出されない。
【００６５】
これに対し、各実施例の検出方法１および２を用いた場合、検出封止期間において夾雑物Ｋがシーラント層Ｓに埋もれたり、破砕されたりすることがないので僅かな夾雑物Ｋであっても確実に噛み込みを検出することができる。
本発明は上述の実施形態およびこれを用いた各実施例のみに制約されず、各種の変形を伴うことが可能である。
【００６６】
図１７および図１８は、シール期間Ｔ2におけるシール圧の変化パターンの例を示している。図１７の例は破砕強度が比較的高い夾雑物の場合に好適であり、図１８の例は破砕強度が比較的低い場合に好適である。図１７および図１８中（ａ），（ｂ）に示されるように、各例において検出用シール圧Ｐｉの立ち上がりをランプ状または曲線状にしたり、図１７および図１８中（ｃ）に示されるように、各例において検出用シール圧Ｐｉから溶着用シール圧Ｐｍへの切り替わりをランプ状にしたりすることもできる。
【００６７】
その他、一実施形態として図示した機構上の構成や制御装置のハードウェア構成等はあくまで好ましい例であり、本発明を実施するべき態様に合わせて適宜変形が加えられることは言うまでもない。
【００６８】
【発明の効果】
本発明の噛み込み検出装置および噛み込み検出方法（請求項１〜３，６）によれば、微少な夾雑物の噛み込みであってもこれを確実に検出することができる。このため噛み込みを生じた包装袋を確実に排除することができ、包装品の品質向上に寄与することができる。
【００６９】
即ち、検出用シール圧の強弱によって被包装品の破砕や包材への埋没等を抑えることができるので、被包装品の物性に応じた適切な検出を行うことができるし、被包装品の破砕強度に合わせてシール圧の強弱を設定することで、より合理的な検出が可能となる。
また横シーラの駆動をサーボモータにより行い、また、その位置情報をエンコーダからの帰還パルスにより検出するものであれば（請求項４，５）、より実用性に優れたものとなる。
【図面の簡単な説明】
【図１】製袋充填機を概略的に示した斜視図である。
【図２】横シーラの駆動機構およびその制御装置の構成を示した概略図である。
【図３】横シーラの開閉作動を制御するための手順を示したフローチャートである。
【図４】検出方法１による噛み込み検出ルーチンのフローチャートである。
【図５】検出方法２による噛み込み検出ルーチンのフローチャートである。
【図６】包装サイクル中の各種変数の変化を示したタイミング図である。
【図７】包装サイクル中の各種変数の変化を示したタイミング図である。
【図８】シール期間における横シーラ位置の時間的変化を示した図である。
【図９】シール期間における横シーラ位置の時間的変化を示した図である。
【図１０】横シール領域の変化を夾雑物の有無の違いにより対比して示した連続図である。
【図１１】横シール領域の変化を夾雑物の有無の違いにより対比して示した連続図である。
【図１２】検出方法２について行った各実施例の結果を示した棒グラフである。
【図１３】図１２の各実施例と対比される比較例の結果を示した棒グラフである。
【図１４】シール圧を一定に制御した場合の横シーラ位置の変化を示した図である。
【図１５】シール圧を一定に制御した場合の横シール領域の変化を示した連続図である。
【図１６】シール圧を一定に制御した場合の横シール領域の変化を示した連続図である。
【図１７】シール圧の変化パターンについての各種変形例を示した図である。
【図１８】シール圧の変化パターンについての各種変形例を示した図である。
【符号の説明】
２ 充填チューブ
１０ フィードローラ
１６ 縦シーラ
２０ 横シーラ
３２ サーボモータ
３４ ロータリエンコーダ（位置検出手段）
３６ サーボアンプ
３８ 制御装置（噛み込み検出手段）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag making and filling machine, and more particularly, to a biting detection device and a biting detection method for detecting whether or not a packaged product is bitten by a lateral sealer.
[0002]
[Prior art]
Techniques relating to detection of biting of the horizontal sealer are described in, for example, Japanese Patent Application Laid-Open Nos. 7-187153 and 2001-48130. In these conventional techniques, the presence or absence of biting is detected by utilizing the repulsive force from foreign substances generated when the packaging cylinder is laterally sealed.
[0003]
Among these, the former technique stores the position of the horizontal sealer when the side seal is carried out in the absence of an article to be packaged, and the position of the horizontal sealer when load torque is generated in the sealer driving means due to this position and impurities. And the presence or absence of impurities is detected. On the other hand, the latter technique detects the presence or absence of the seal drive means caused by the repulsive force of impurities.
[0004]
[Problems to be solved by the invention]
However, some contaminants that are packaged products are easily crushed by the biting of the horizontal sealer. For this reason, if the foreign matter is crushed quickly at the time of horizontal sealing, the repulsive force no longer occurs. Or even if it is a foreign material which is hard to be crushed, since a packaging material will fuse | melt at the time of a horizontal seal, if the foreign material is buried in the melted layer early, the repulsive force will not arise.
[0005]
In the above-described prior art, since the biting is detected by utilizing the repulsive force from the foreign matter, there is a problem that the detection cannot be performed if the repulsive force does not occur due to the crushing of the foreign matter or the embedding in the packaging material. is there. Such a problem is particularly noticeable in the case of minute contaminants, and when the contaminants are minute, the repulsive force to the lateral sealer hardly occurs, so that it is very difficult to detect the bite.
[0006]
Therefore, the present invention provides a bag-making device that can reliably detect the presence or absence of biting even if the foreign matter is minute, or is easily crushed at the time of horizontal sealing or is easily buried in a packaging material. It is an object of the present invention to provide a lateral sealer biting detection device and a biting detection method thereof in a filling machine.
[0007]
[Means for Solving the Problems]
The biting detection device according to the present invention (Claim 1) includes a position detection means for detecting position information during the opening / closing stroke in accordance with the opening / closing operation of the horizontal sealer, and the seal pressure of the horizontal sealer in a stepwise manner over time. A seal pressure adjusting means for changing and a biting detection means for detecting whether or not the packaged product is bitten by the horizontal sealer based on a change in position information of the horizontal sealer accompanying the change in the seal pressure.
[0008]
By changing the seal pressure stepwise, a noticeable change appears in the position of the horizontal sealer in the seal depending on whether or not there is a contaminant. Using this characteristic, the biting detection means can detect the presence or absence of biting. For this reason, for example, even if it is a contaminant that is easily crushed, a contaminant that is buried in the molten layer of the packaging material, or a minute impurity, whether or not biting has occurred before the change such as crushing or embedding occurs. It can be detected reliably.
[0009]
Furthermore, in the case of claim 1, Seal pressure adjustment means As time passes Change to two stages, the first first stage seal pressure is the detection seal pressure set according to the physical properties of the package, and the second second stage seal pressure is the welding seal pressure, then horizontal seal The line Yeah. In this case, by appropriately setting the detection seal pressure according to the physical properties of the packaged object, it is possible to suppress crushing of foreign substances and burying in the packaging material.
[0010]
More specifically, the physical property of the packaged product is given by its crushing strength, and the seal pressure adjusting means sets the detection seal pressure to be lower than the welding seal pressure according to the crushing strength of the packaged product. (Claims 2 Or the detection seal pressure is set to be stronger than the welding seal pressure according to the crushing strength of the packaged product (claims) 3 ) . For example, when the crushing strength of the packaged product is relatively low, crushing of foreign matters is prevented by applying a weak seal pressure for detection. On the other hand, when the crushing strength of the packaged product is relatively high, a strong detection sealing pressure is applied before melting, and the biting is detected so that the foreign matter is not buried in the molten layer of the packaging material. These biting detection methods are particularly effective when the impurities are very small.
[0011]
Biting detection device of the present invention (claim) 4 ) Can take a more practical configuration. Specifically, the drive means for opening and closing the horizontal sealer includes a servo motor that is driven based on a predetermined position command pulse. The position detecting means includes an encoder that outputs a feedback pulse representing the rotation angle position of the servo motor, and detects position information based on the feedback pulse.
[0012]
In this case, a difference appears in the position information depending on the presence or absence of contaminants during the horizontal seal, so the biting detection means can detect the presence or absence of biting using the difference in position information.
Alternatively, the biting detection means can detect the presence or absence of biting based on the total number of feedback pulses input while the horizontal sealer is in the closed position. 5 ). In this case, even if it is difficult for a difference in position information to appear instantaneously due to the physical properties of the contaminants, the difference in position information due to the presence or absence of biting is accumulated during the seal period, so that the difference appears. Biting can be detected using the difference.
[0013]
Biting detection method implemented using the biting detection device described above (claim) 6 ) Indicates the seal pressure applied to the packaging cylinder during the closing operation of the horizontal sealer while detecting the position information during the opening / closing stroke of the horizontal sealer. It is changed in two steps as time passes, and the first first stage seal pressure is set as the detection seal pressure that is set according to the physical properties of the package, and the second second stage seal pressure is welded. By letting horizontal sealing as the sealing pressure, Based on the change in the positional information accompanying the change in the seal pressure, it is detected whether or not the packaged product is caught by the horizontal sealer.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be applied, for example, to a vertical bag making and filling machine that performs vertical pillow packaging of foods such as powder and snacks. However, the application of the present invention is not limited to a specific bag making and filling machine, and the packaged product is not limited to a granular material or food.
[0015]
FIG. 1 schematically shows a vertical bag making and filling machine according to an embodiment of the present invention. The vertical bag making and filling machine includes a filling tube 2 extending vertically, and a former 6 is provided above the filling tube 2.
When the article to be packaged is a granular material, an auger screw is rotatably accommodated in the filling tube 2 and the upper end of the filling tube 2 is a hopper that receives the supply of the granular material (none is shown). It is connected to the. Alternatively, when the packaged item is a solid such as snack confectionery, the inside of the filling tube 2 is hollow, and its upper end is connected to a supply hopper and a measuring instrument (both not shown).
[0016]
The vertical bag making and filling machine includes a film roll FR, and a long film packaging material F is drawn out from the film roll FR. The film wrapping material F is guided from the film roll FR to the filling tube 2 through a number of guide rollers, and the film wrapping material F is guided by the former 6 and formed into a cylindrical shape around the filling tube 2, and both side edges are formed. They are drawn downward while being superposed on each other.
[0017]
The film wrapping material F is fed out toward the filling tube 2 from the film roll FR. The feed roller 10 is arranged in the middle of the feeding path, and the film packaging material F is fed along the feeding path as the feed roller 10 rotates.
On the other hand, a pair of feed units 12 are arranged on both sides of the filling tube 2. Each feed unit 12 has an endless suction belt 14, which extends along the filling tube 2 and can travel in one direction by a servo motor (not shown). In FIG. 1, only one feed unit 12 is shown.
[0018]
A vertical sealer 16 is disposed between the pair of feed units 12. The vertical sealer 16 has a pair of heater blocks 18, and these heater blocks 18 extend in the vertical direction along the filling tube 2. When the film wrapping material F passes between the pair of heater blocks 18, the joints on both side edges thereof are vertically sealed, that is, heat-sealed and bonded in a predetermined form (for example, a form of a palm). Thereby, the film packaging material F becomes a packaging material tube W around the filling tube 2.
[0019]
On the other hand, a horizontal sealer 20 is disposed below the filling tube 2. The horizontal sealer 20 includes a pair of heater blocks 22, and the horizontal sealer 20 can move the pair of heater blocks 22 toward and away from each other in accordance with the opening / closing operation thereof. In the case of a continuous type bag making and filling machine, the horizontal sealer 20 is accompanied by a lifting / lowering operation in addition to the opening / closing operation. Therefore, as shown by a two-dot chain line in the figure, the horizontal sealer 20 is combined with the opening / closing and lifting / lowering operations. Perform box motion. In the intermittent bag making and filling machine, the horizontal sealer 20 performs only opening and closing operations.
[0020]
FIG. 2 schematically shows the drive mechanism of the horizontal sealer 20 and its control system. The pair of heater blocks 22 are connected to both ends of the swing lever 28 via a pair of link rods 24 and 26, respectively. The lever shaft 30 of the swing lever 28 is connected to the output shaft of the servo motor 32. Accordingly, the servo motor 32 swings the swing lever 28 in a predetermined swing angle region by forward and reverse rotation, and the heater blocks 22 are brought into contact with and separated from each other via the link rods 24 and 26 along with the swing. To do. That is, the horizontal sealer 20 is opened and closed with respect to the packaging material cylinder W delivered to the lower side of the filling tube 2 by forward and reverse rotation of the servo motor 32.
[0021]
When the horizontal sealer 20 is in the closed position, the pair of heater blocks 22 sandwich the packaging cylinder W and heat-seal, that is, laterally seal the packaging cylinder W in the transverse direction. Further, a cutter blade (not shown) is built in one heater block 22, and the cutter blade projects from one heater block 22 after the horizontal sealing is completed, and cuts the packaging cylinder W. The protruding cutter blade enters a relief groove formed in the other heater block 22.
[0022]
The horizontal sealing and cutting of the packaging cylinder W by the lateral sealer 20 are performed alternately with the introduction of the packaged product from the filling tube 2 into the packaging cylinder W. Thereby, the packaging bag B which received the filling of the to-be-packaged goods is manufactured and falls. When the packaged product is a granular material, a certain amount of the granular material is put into the packaging cylinder W from the lower end of the filling tube 2 by the rotation of the auger screw. When the packaged product is a solid product such as snack confectionery, a certain amount of solid product is dropped into the supply hopper by the above-described measuring instrument, and the packaged product is further loaded into the packaging cylinder W through the filling tube 2.
[0023]
Thereafter, the packaging bag B is supplied onto the transfer conveyor via the chute and transferred toward the subsequent boxing machine.
The servo motor 32 is connected to the control device 38 via the servo amplifier 36 in order to control the opening / closing operation of the horizontal sealer 20 in conjunction with the feeding of the packaging cylinder W and the powder filling operation by the feed unit 12 described above. Further, a rotary encoder 34 built in the servo motor 32 is also connected to the control device 38.
[0024]
The control device 38 is composed of hardware including various electronic circuits including the CPU 40, and specifically includes a timing monitoring unit 42, an operation unit 44, a calculation unit 46, and an abnormality output unit 48. The control device 38 incorporates a storage circuit such as a ROM 50 and a RAM 52 for storing control programs and data, and a setting storage unit 54. In addition, the control device 38 includes a biting determination unit 56 that performs arithmetic processing, an input interface 58 and an output interface 60 that exchange information with the outside.
[0025]
The control device 38 transmits a command pulse to the servo amplifier 36 through the output interface 60, and the servo amplifier 36 operates the servo motor 32 according to the command pulse. On the other hand, the rotary encoder 34 supplies a position detection signal corresponding to the actual rotation angle position of the servo motor 32, that is, the actual swing angle of the swing lever 28, to the control device 38. The position detection signal is output in the form of a feedback pulse, for example, and transmitted to the control device 38 through the input interface 58.
[0026]
The control device 38 also has a function of automatically setting the origin position (open position) of the horizontal sealer 20. In order to achieve this function, an origin detector 62 is connected to the input interface 58 of the controller 38.
The control device 38 having the above-described hardware configuration can specifically control the opening / closing operation of the horizontal sealer 20 by executing a predetermined control program. In this control program, not only the opening / closing timing of the horizontal sealer 20 but also the adjustment of the sealing pressure applied to the packaging cylinder W at the closed position is achieved.
[0027]
Further, this control program has a function of detecting whether or not the packaged product is bitten by the horizontal sealer 20, and an example of the control program will be described below.
3 to 5 show a control flow that can be cited as an example of a control program. 6 and 7 show temporal changes of various variables (A to G) accompanying the execution of this control program. 6 and 7, if one packaging cycle of the bag making and filling machine is T, various variables (A to G) change in a predetermined pattern within one packaging cycle time T.
[0028]
In this control program, the opening / closing operation of the horizontal sealer 20 can be performed by dividing it into two control methods. The first is speed control, which calculates a command pulse using the opening / closing speed of the horizontal sealer 20 as a target value and outputs the command to the servo amplifier 36 to control the operation of the servo motor 32. .
The second is torque control, which calculates a command pulse with the seal pressure applied to the packaging cylinder W when the lateral sealer 20 is in the closed position as a target value, and outputs the command to the servo amplifier 36. The operation of the servo motor 32 is controlled.
[0029]
These two controls are switched by the horizontal sealer 20. Open Action Period T Three (Step S1). For this reason, the control device 38 controls the horizontal sealer 20 in the timing monitoring unit 42. Action Always monitoring. 6 and 7, Open Action Period T Three Is defined as the period during which the horizontal sealer 20 moves from the closed position to the open position during one packaging cycle.
[0030]
Opening and closing operation of the horizontal sealer 20 Open Action Period T Three (Step S1 = Yes), the speed control is selected in the control program (step S13). In this case, the control device 38 performs arithmetic processing based on the feedback pulse from the rotary encoder 34, and detects the position of the horizontal sealer 20 (step S14). The control device 38 outputs a speed command value (position command pulse) to the servo amplifier 36 (step S15). As a result, the operation of the servo motor 32 is controlled to give the target speed to the lateral sealer 20.
[0031]
Opening and closing operation of the horizontal sealer 20 Open Action Period T Three If not (step S1 = No), the control device 38 determines the control switching timing while detecting the position of the horizontal sealer 20 (step S2) (step S3). The control switching timing means a timing at which switching from speed control to torque control is to be performed, and the arrival of this timing is determined by the position of the lateral sealer 20.
[0032]
6 and 7, the control switching timing Tc is set immediately before the horizontal sealer 20 reaches the closed position from the open position. At this control switching timing Tc, the servo motor 32 is switched from speed control to rotational torque control. Specifically, the control switching timing Tc is set at one of the following timings. First, in FIG. 6 and FIG. 7, in the rotational speed model of the servo motor 32, the point at which the rotational speed is reduced to a certain rate (for example, 20%) or less of the maximum speed is set as the control switching timing Tc. Second, based on the feedback pulse output from the rotary encoder 34, the time when the horizontal sealer 20 arrives just before the closed position is set as the control switching timing Tc.
[0033]
Before the control switching timing Tc arrives (step S3 = No), the control device 38 continues the speed control (step S4), and outputs a speed command value to the servo amplifier 36 (step S5). The biting detection routine R2 is provided before step S4, and the process here will be described later.
On the other hand, when the control switching timing Tc comes (step S3 = Yes), the control device 38 switches the control method from speed control to rotational torque control (step S6).
[0034]
As shown in FIG. 6 and FIG. 7, after the switching to the torque control, the rotation torque increasing section T within a predetermined time. Four Is provided. This rising section T Four Then, the theoretical value of the rotational torque is commanded to the servo amplifier 36. The theoretical value of the rotational torque is calculated on the assumption that the lateral seal position does not fluctuate. Specifically, this is for gradually increasing the rotational torque from 0 to the above theoretical value. Such rising section T Four Is set, the impact applied to the drive mechanism of the servo motor 32 and the lateral sealer 20 is reduced. That is, when a large rotational torque is applied to the servomotor 32 immediately after the above control switching timing Tc, the impact becomes excessive, but in this control, the rising section T Four To increase the rotational torque gradually.
[0035]
Also, the control timing is the rising section T Four (Step S7 = Yes), the control device 38 calculates the theoretical value of the rotational torque (step S8). Assuming that the target value of the rotational torque is the seal pressure applied to the packaging cylinder W, the line connecting the center of the lever shaft 30 and the center of the lateral sealer 20 and the swing lever 28 as shown in FIG. It is obtained dynamically from the angle θ formed by the axis.
[0036]
As shown in FIG. 6 and FIG. Period T 2 The target value of the appropriate seal pressure (G) is changed in two stages. Specifically, the first stage is the detection seal pressure Pi and the second stage is the welding seal pressure Pm. The detection seal pressure and the welding seal pressure , The strength of the appropriate seal pressure is provided.
[0037]
The control device 38 calculates the theoretical value of the rotational torque based on the preset appropriate seal pressure (G) pattern, and outputs the rotational torque command value to the servo amplifier 36 based on the obtained theoretical value (step). S11). This results in a seal Period T 2 The operation of the servo motor 32 is controlled so as to give the target seal pressure (G) to the lateral sealer 20. When torque control is performed, the rising section T Four Then, the rotation speed limit value is output together (step S12). That is, after the servo motor 32 control is switched from the speed control to the rotational torque control, the rotational speed of the servo motor 32 may increase abruptly until the horizontal sealer 20 reaches the closed position. In order to avoid such a rapid increase in the rotational speed, the speed limit control is executed in this control. For example, the rotation speed limit value is set to a value corresponding to the rotation speed model (B) in FIGS. 6 and 7.
[0038]
Rising section T Four When the time has passed (step S7 = No), the control device 38 detects the position of the lateral sealer 20 (step S9), and then executes the biting detection routine R1. The biting detection routine R1 and the biting detection routine R2 described later are executed to detect whether or not the packaged item is bitten when the lateral sealer 20 is closed.
[0039]
As shown in FIG. 4, in the biting detection routine R1, it is determined whether the detection method is set to 1 or 2 (step S101). The detection methods 1 and 2 are set before the operation of the vertical bag making and filling machine is started. First, in the detection method 1, when a predetermined determination timing has arrived (step S102 = Yes), the presence / absence of biting is determined by comparing the theoretical value regarding the operating position of the horizontal sealer 20 with its current position (step S102). S103, S104).
[0040]
On the other hand, in the detection method 2, first, the cumulative value of the current position information of the horizontal sealer 20 is calculated (step S106), and as shown in FIG. 2 From open operation period T Three When the timing for switching to is reached (step S201), the presence or absence of biting is determined by comparing the accumulated value with the accumulated theoretical value (steps S202 and S203).
[0041]
When returning from the biting detection routine R1, the control device 38 determines that the operation interval of the horizontal sealer 20 is at timing T. Five (Step S107), and as a result, the timing T Five If so, the rotational torque of the servo motor 32 is controlled by the detection seal pressure Pi (step S108).
Thereafter, the operation interval of the horizontal sealer 20 is changed to the timing T. Five If it is not (step S107 = No), the control apparatus 38 will perform rotational torque control of the servomotor 32 by the welding seal pressure Pm (step S109).
[0042]
The total sealing period T 2 While the torque control is being executed, the control device 38 calculates the actual rotational torque (step S10).
Hereinafter, the operation of the biting detection device will be described in detail with specific examples. The contents of the detection method using the biting detection device will also be clarified from the following description.
[0043]
Using the bag making and filling machine of FIG. 1, a packaging bag having a bag width of 100 mm and a bag length of 200 mm is produced. For the film packaging material, a vapor-deposited aluminum film having a thickness of 90 μm and a width of 225 mm is used. The packaging material feed length in one packaging cycle T is 200 mm, and the production rate is 60 bags per minute. The horizontal sealing time is 180 nsec.
8 and 9 show the sealing period T 2 The temporal change of the horizontal sealer position in the vicinity of is shown. In these drawings, the horizontal sealer position is an open position above the vertical axis and a closed position below. The lateral sealer position is expressed in the form of a feedback pulse input to the control device 38. In these figures, the change indicated by the solid line indicates that there is a contaminant (biting), whereas the change indicated by the alternate long and short dash line indicates that there is no impurity.
[0044]
When the crushing strength of the foreign matter is relatively high (for example, a small amount of coffee powder), as shown in FIG. 2 An embodiment in which a strong sealing pressure is applied at the beginning and a weak sealing pressure is applied thereafter is preferable. In this case, the position change of the horizontal sealer 20 shows the tendency shown in FIG.
As shown in FIG. 8, first, the horizontal sealer 20 is closed by speed control, and the horizontal sealer 20 reaches a position closest to the closed position. Thereafter, the pair of heater blocks 22 repel each other, and the horizontal sealer 20 rebounds in the direction of the open position.
[0045]
Next, when torque control is executed and the first-stage detection seal pressure Pi is applied, the lateral sealer 20 approaches the closed position and is stable. In this way, the period in which the detection seal pressure Pi is applied is hereinafter referred to as a detection sealing period.
FIG. 10 continuously shows the change in the lateral seal area due to the presence or absence of the contaminant K. The changes (a) to (d) in the case where the contaminant K is present and the changes (e) to (h) in the case where there is no contaminant K are in correspondence with each other in terms of timing.
[0046]
When there is a contaminant K, as shown in FIG. 10C, even if a strong detection seal pressure Pi is applied during the detection sealing period, the contaminant K does not bury the sealant layer S in the sealant layer S. The base material layer M is spread outward. Compared with the thickness Ws of the two base material layers M at the same timing (g) when there is no contaminant K, when there is the contaminant K, the thickness Wa is larger (Wa> Ws). For this reason, when the case where the contaminant K is present is compared with the case where the contaminant K is present, the position of the horizontal sealer 20 is closer to the open position when the contaminant K is present.
[0047]
Next, the reason why the contaminant K is not buried in the sealant layer S in comparison with FIG. FIG. 15 continuously shows changes in the lateral seal area when the seal pressure P is always controlled to be constant as in the prior art. Note that the changes in (a) to (d) in FIG. 15 correspond to the changes in (a) to (d) in FIG. 10 in terms of timing.
When the sealing pressure P is controlled to be constant, the foreign matter K is immediately buried in the sealant layer S at the beginning of the closing operation of the lateral sealer 20 ((c) in FIG. 15), and does not spread the base material layer M due to its presence. . For this reason, the thickness Wa of both the base material layers M is almost close to the thickness Ws when there is no contaminant K (Wa≈Ws), and the difference between them is difficult to detect.
[0048]
Further, as shown in FIG. 10 (c), when a strong detection seal pressure Pi is applied during the detection sealing period, the two sealant layers S are strongly pressed against each other, and the thickness of these layers is compressed to X1. .
On the other hand, when the sealing pressure P is controlled to be constant ((c) in FIG. 15), the pressure force applied to the two sealant layers S is weaker than that in the case of FIG. 10 (c), and the layer thickness is X2. At this time, the sealant layer S is not yet melted, and the layer thickness depends on the seal pressures Pi and P. Therefore, the layer thickness X2 is thicker than the layer thickness X1 (X1 <X2).
[0049]
Thereafter, when a constant sealing pressure P is continuously applied, the sealant layer S is pushed out by the contaminants K when it melts, and the melted sealant material easily moves from between the contaminants K and the base material layer M to the surroundings. ((D) in FIG. 15). As a result, the contaminants K are buried in the melted sealant layer S, and the outer surface of the base material layer M becomes flat.
On the other hand, when the seal pressure Pi for detection is applied before the sealant layer S melts, the sealant layer S is compressed (X1), and then the sealant layer S starts to melt, but the sealant layer S has a layer thickness of X2. Unlike the case, it does not move to the direction without the contaminant K. That is, the sealant layer S remains between the contaminant K and the base material layer M. For this reason, the sealant layer S remains between the contaminants K and the base material layer M even after melting, and the presence of the sealant layer S causes the outer surface of the base material layer M to expand.
[0050]
Therefore, if the determination timing in step S102 is, for example, the end of the detection sealing period, the current position is more determined as a result of comparing the theoretical value (no impurities K) regarding the position of the horizontal sealer 20 at this time with the current position. If it is close to the open position, it can be determined in step S104 that there is an abnormality (with biting).
Further, even when the determination timing of step S102 is, for example, the end of the welding sealing period, the horizontal sealer 2 is Zero If the current position is closer to the open position as a result of comparing the theoretical value (no impurities K) with respect to the position and the current position, it can be determined that there is an abnormality (with biting) in step S104.
[0051]
Therefore, when the detection seal pressure Pi is set to be strong, it is possible to detect the biting in both the detection sealing period and the welding sealing period.
Thereafter, when the detection sealing period has passed, the torque command value changes in the torque control as shown in FIG. 6, and the appropriate seal pressure (G) applied from the lateral sealer 20 to the packaging cylinder W is the second stage. The welding seal pressure Pm becomes. Hereinafter, the period in which the welding seal pressure Pm is applied is referred to as a welding sealing period. The welding seal pressure Pm is weaker than the detection seal pressure Pi, and therefore, the sealant layer S is suitably laterally sealed without being over-welded within the welding sealing period ((d) and (h) in FIG. 10). As a result, the lateral sealability when there is no contaminant K is sufficiently secured.
[0052]
On the other hand, when the crushing strength of the impurities is relatively low (for example, a granular material), as shown in FIG. 2 A mode in which a weak proper sealing pressure is applied at the beginning and a strong sealing pressure is applied thereafter is preferable. In this case, the position change of the horizontal sealer 20 shows the tendency shown in FIG.
As shown in FIG. 9, first, the horizontal sealer 20 is closed by speed control, and the horizontal sealer 20 once approaches the closed position. Thereafter, the pair of heater blocks 22 repel each other and the horizontal sealer 20 rebounds in the direction of the open position as in the case of FIG.
[0053]
here, When torque control is executed and the first-stage detection seal pressure Pi is applied, the horizontal sealer 20 slightly approaches the closed position and stabilizes within the detection sealing period.
FIG. 11 continuously shows the change in the lateral seal region depending on the presence or absence of the foreign matter K when the crushing strength is relatively low.
Even if there is a foreign matter K, if the foreign matter K is crushed by the initial sealing pressure, it is difficult to detect the presence or absence thereafter. Accordingly, the first-stage detection seal pressure Pi is set to be weak, and the contamination K is prevented from being crushed.
[0054]
When there is such a contaminant K, since the weak detection seal pressure Pi is applied during the detection sealing period as shown in FIG. 11C, the contaminant K is not crushed. Further, at this time, the horizontal sealer 20 is stable at a position where the foreign matter K is sandwiched. Compared with the thickness Ws of the two base material layers M at the same timing (g) when there is no contaminant K, when there is the contaminant K, the thickness Wa is larger (Wa> Ws). For this reason, when the case where the contaminant K is present is compared with the case where the contaminant K is not present, the position of the horizontal sealer 20 is closer to the open position when the contaminant K is present as in the case described above.
[0055]
Therefore, as in the case of FIG. 8, if the determination timing in step S102 is, for example, the end of the detection sealing period, the theoretical value related to the position of the horizontal sealer 20 (no impurities K) is compared with the current position at this time. If the current position is closer to the open position, it can be determined in step S104 that there is an abnormality (with biting).
[0056]
Thereafter, when the detection sealing period has passed, the torque command value changes in the torque control as shown in FIG. 7, and the appropriate seal pressure (G) applied from the lateral sealer 20 to the packaging cylinder W is the second stage. The welding seal pressure Pm becomes. The sealing pressure Pm for welding is stronger than the sealing pressure Pi for detection. Therefore, the sealant layer S is sufficiently welded within the welding sealing period ((d) and (h) in FIG. 10). As a result, the lateral sealability when there is no contaminant K is sufficiently secured.
[0057]
The above is an example of the detection method 1. Next, an example of the detection method 2 will be described.
In the detection method 1 described above, when FIG. 8 and FIG. 9 are compared with respect to the position change of the horizontal sealer 20, it can be said that when the crushing strength of the foreign matter K is relatively weak, the difference depending on the presence or absence thereof is not likely to appear. For this reason, due to the physical properties of the contaminant K, it is difficult to make a clear comparison between the current position and the theoretical value in step S102, and it may not be possible to determine whether or not there is an abnormality in step S104.
[0058]
In this case, determination by the detection method 2 is possible. As described above, in the detection method 2, the sealing period T 2 From open operation period T Three When the switching timing Tr is reached, the detection sealing start time (T Four And T Five The presence or absence of biting is determined by comparing the accumulated feedback pulse value with the accumulated theoretical value during the period from the period until the switching timing Tr.
Specifically, when the feedback pulse accumulated value is compared between the case where the contaminant K is present and the case where the contaminant K is not present, a slight difference in the current position between the two in each scan time (control interval) is integrated and reflected. Therefore, the current position cumulative value is larger when there is no contaminant K than when there is no contaminant K.
[0059]
Therefore, in step S201, the switching timing Tr (T 2 → T Three ) Has arrived, at this point in time, if the cumulative current value (there is no contaminant K) and the current position cumulative value are compared, the current position cumulative value is larger. It can be determined that there is an abnormality (with biting).
FIG. 12 shows the results of Examples 1 to 5 in which the current position accumulated value was measured for the detection method 2. On the other hand, FIG. 13 shows the results of Comparative Examples 1 to 5 in which the current position accumulated value was measured by controlling the seal pressure to be constant.
[0060]
In FIG. 12 and FIG. 13, the numbers 1 to 5 correspond to the respective examples or comparative examples, and the left half of the five samples are the results when no impurities are present, and the right half of the five samples It is a result when there is a foreign object.
As is clear from the results of Examples 1 to 5, there is a significant difference in the current position accumulated value depending on the presence or absence of impurities (see FIG. 12).
[0061]
On the other hand, in Comparative Examples 1-5, a clear magnitude difference is not recognized by the present position accumulated value by the presence or absence of a contaminant (refer FIG. 13). Therefore, the sealing period T 2 If the sealing pressure is controlled to be constant, it can be said that it is difficult to detect the presence or absence of impurities based on the position information of the horizontal sealer 20. About the result of a comparative example, the following description is further added.
[0062]
FIG. 14 shows temporal changes in the horizontal sealer position for the comparative example. In FIG. 14, the change indicated by the solid line is when there is a contaminant, and the change indicated by the alternate long and short dash line indicates that there is no contaminant.
Also in the comparative example, the horizontal sealer 20 approaches the closed position, and thereafter, the pair of heater blocks 22 repel each other, and the horizontal sealer 20 slightly returns to the open position.
[0063]
Next, when a certain sealing pressure is applied to the packaging cylinder W after the transition to the sealing period, the current position of the horizontal sealer 20 shows a similar tendency regardless of the presence or absence of impurities.
This point will be examined in more detail with the addition of FIGS. When the sealing pressure P is controlled to be constant as in the comparative example, when the crushing strength of the contaminants K is relatively high, the change in the lateral seal region is as shown in FIG. That is, the contaminant K is immediately buried in the sealant layer S at the beginning of the closing operation of the horizontal sealer 20 ((c) in FIG. 15) and does not spread the base material layer M due to its presence. For this reason, the thickness Wa of both the base material layers M is almost close to the thickness Ws when there is no contaminant K (Wa≈Ws), and the difference between them is difficult to detect.
[0064]
On the other hand, when the crushing strength of the contaminants K is relatively low, the change in the lateral seal region is as shown in FIG. In this case, the foreign matter K is easily crushed in the initial closing operation of the horizontal sealer 20 ((c) in FIG. 16). For this reason, similarly, the thickness Wa of both the base material layers M is almost close to the thickness Ws when there is no contaminant K (Wa≈Ws), and these differences are hardly detected.
[0065]
On the other hand, when the detection methods 1 and 2 of each example are used, the contaminants K are not buried or crushed in the sealant layer S during the detection sealing period. However, it is possible to reliably detect the biting.
The present invention is not limited only to the above-described embodiment and each example using the same, and various modifications can be involved.
[0066]
17 and 18 show the sealing period T 2 The example of the change pattern of the sealing pressure in is shown. The example of FIG. 17 is suitable for a contaminant having a relatively high crushing strength, and the example of FIG. 18 is suitable for a case where the crushing strength is relatively low. As shown in FIGS. 17 and 18 (a) and (b), the rising of the detection seal pressure Pi is ramped or curved in each example, or is shown in FIG. 17 and FIG. 18 (c). As described above, in each example, the switching from the detection seal pressure Pi to the welding seal pressure Pm can be changed to a ramp shape.
[0067]
In addition, the configuration on the mechanism illustrated in the embodiment, the hardware configuration of the control device, and the like are merely preferred examples, and it is needless to say that modifications are appropriately added according to the mode in which the present invention is to be implemented.
[0068]
【The invention's effect】
Biting detection device and biting detection method according to the present invention (claims) 1-3,6 ), It is possible to reliably detect even a minute bite of a foreign object. For this reason, the packaging bag which has bite can be surely eliminated, and the quality of the packaged product can be improved.
[0069]
That is, The strength of the seal pressure for detection can suppress crushing of the packaged goods and burying in the packaging material. so, Appropriate detection can be performed according to the physical properties of the packaged product, and the strength of the sealing pressure is set according to the crushing strength of the packaged product. by doing , More rational detection becomes possible.
If the lateral sealer is driven by a servo motor and its position information is detected by a feedback pulse from an encoder (claim) 4,5 ), More practical.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing a bag making and filling machine.
FIG. 2 is a schematic view showing a configuration of a drive mechanism of a horizontal sealer and a control device thereof.
FIG. 3 is a flowchart showing a procedure for controlling the opening and closing operation of the horizontal sealer.
FIG. 4 is a flowchart of a biting detection routine according to a detection method 1;
FIG. 5 is a flowchart of a biting detection routine according to a detection method 2;
FIG. 6 is a timing diagram showing changes in various variables during a packaging cycle.
FIG. 7 is a timing diagram showing changes in various variables during a packaging cycle.
FIG. 8 is a diagram showing a temporal change in the horizontal sealer position during the sealing period.
FIG. 9 is a diagram showing a temporal change in the horizontal sealer position during the sealing period.
FIG. 10 is a continuous diagram showing the change in the horizontal seal area in comparison with the presence or absence of impurities.
FIG. 11 is a continuous diagram showing the change in the lateral seal area in comparison with the presence or absence of impurities.
FIG. 12 is a bar graph showing the results of each example performed for detection method 2;
13 is a bar graph showing the results of a comparative example compared with each of the examples in FIG.
FIG. 14 is a diagram showing a change in the lateral sealer position when the seal pressure is controlled to be constant.
FIG. 15 is a continuous diagram showing changes in the lateral seal region when the seal pressure is controlled to be constant.
FIG. 16 is a continuous diagram showing changes in the lateral seal region when the seal pressure is controlled to be constant.
FIG. 17 is a view showing various modifications of the seal pressure change pattern.
FIG. 18 is a view showing various modified examples of a change pattern of the seal pressure.
[Explanation of symbols]
2 Filling tube
10 Feed roller
16 Vertical sealer
20 horizontal sealer
32 Servo motor
34 Rotary encoder (position detection means)
36 Servo amplifier
38 Control device (biting detection means)

Claims (6)

長尺な包材を充填チューブの周りで筒状に成形しながら長手方向に繰り出し、この繰り出し過程にて、包材の合わせ目を縦シールして包材筒を形成するとともに、前記充填チューブの下方で横シーラの開閉動作により前記包材筒の横シールおよびその切断と前記充填チューブから前記包材筒内への被包装品の充填とを交互に行う製袋充填機において、
前記横シーラを開閉させる駆動手段と、
前記横シーラの開閉動作に伴い、その開閉ストローク中における位置情報を検出する位置検出手段と、
前記駆動手段により前記横シーラを閉じさせるとき、前記包材筒に与えるシール圧を時間の経過とともに２段階に変化させ、先の第１段階目のシール圧を被包装物の物性に応じて設定される検出用シール圧とし、後の第２段階目のシール圧を溶着用シール圧として横シールを行わせるシール圧調整手段と、
前記シール圧の変化に伴う前記位置情報の変化に基づき、前記横シーラによる被包装品の噛み込みの有無を検出する噛み込み検出手段と
を具備したことを特徴とする製袋充填機における横シーラの噛み込み検出装置。While forming a long packaging material around the filling tube in the longitudinal direction, it is fed out in the longitudinal direction, and in this feeding process, the seam of the packaging material is vertically sealed to form a packaging cylinder, and the filling tube In the bag making and filling machine that alternately performs the horizontal seal of the packaging cylinder and the cutting thereof and the filling of the packaging product from the filling tube into the packaging cylinder by the opening and closing operation of the lateral sealer at the bottom,
Drive means for opening and closing the horizontal sealer;
In accordance with the opening / closing operation of the horizontal sealer, position detecting means for detecting position information during the opening / closing stroke;
When the lateral sealer is closed by the driving means, the sealing pressure applied to the packaging cylinder is changed in two stages with the passage of time , and the first stage sealing pressure is set according to the physical properties of the package. A seal pressure adjusting means for performing a lateral seal with a sealing pressure for detection to be performed, and a sealing pressure at the second stage later as a sealing pressure for welding ;
A lateral sealer in a bag making and filling machine, comprising: a biting detection means for detecting whether or not a packaged product is bitten by the horizontal sealer based on a change in the positional information accompanying a change in the seal pressure. Bite detection device. 前記物性が被包装品の破砕強度により与えられており、
前記シール圧調整手段は被包装品の破砕強度に応じて前記検出用シール圧を前記溶着用シール圧よりも弱く設定することを特徴とする請求項１に記載の製袋充填機における横シーラの噛み込み検出装置。The physical properties are given by the crushing strength of the packaged product,
The sealing pressure adjusting means of the transverse sealer in the bag-making filling machine according to claim 1, characterized in that the set weaker than the welding sealing pressure of the detection sealing pressure in accordance with the crush strength of the packaged article Biting detection device. 前記物性が被包装品の破砕強度により与えられており、
前記シール圧調整手段は被包装品の破砕強度に応じて前記検出用シール圧を前記溶着用シール圧よりも強く設定することを特徴とする請求項１に記載の製袋充填機における横シーラの噛み込み検出装置。The physical properties are given by the crushing strength of the packaged product,
2. The horizontal sealer of the bag making and filling machine according to claim 1 , wherein the sealing pressure adjusting means sets the detection sealing pressure stronger than the welding sealing pressure according to the crushing strength of the packaged product. Biting detection device. 前記駆動手段は所定の位置指令パルスに基づいて駆動されるサーボモータを含み、
前記位置検出手段は前記サーボモータの回転角位置を表す帰還パルスを出力するエンコーダを含み、かつ、前記帰還パルスに基づいて前記位置情報を検出することを特徴とする請求項１から３のいずれかに記載の製袋充填機における横シーラの噛み込み検出装置。The drive means includes a servo motor driven based on a predetermined position command pulse,
It said position detecting means includes an encoder that outputs a feedback pulse which represents the rotational angle position of the servo motor, and any one of claims 1 to 3, characterized by detecting the positional information based on the feedback pulse A lateral sealer biting detection device in the bag making and filling machine according to claim 1. 前記駆動手段は所定の位置指令パルスに基づいて駆動されるサーボモータを含み、
前記位置検出手段は前記サーボモータの回転角位置を表す帰還パルスを出力するエンコーダを含み、かつ、前記帰還パルスに基づいて前記位置情報を検出し、
前記噛み込み検出手段は、前記横シーラが閉位置にある間に入力された前記帰還パルスの総数に基づき前記噛み込みの有無を検出することを特徴とする請求項１に記載の製袋充填機における横シーラの噛み込み検出装置。The drive means includes a servo motor driven based on a predetermined position command pulse,
The position detection means includes an encoder that outputs a feedback pulse representing a rotation angle position of the servo motor, and detects the position information based on the feedback pulse,
2. The bag making and filling machine according to claim 1 , wherein the biting detection unit detects the presence or absence of the biting based on a total number of the feedback pulses input while the horizontal sealer is in a closed position. Intrusion detection device for horizontal sealer. 長尺な包材を充填チューブの周りで筒状に成形しながら長手方向に繰り出し、この繰り出し過程にて、包材の合わせ目を縦シールして包材筒を形成するとともに、前記充填チューブの下方で横シーラの開閉動作により前記包材筒の横シールおよびその切断と前記充填チューブから前記包材筒内への被包装品の充填とを交互に行う製袋充填機において、
前記横シーラの開閉ストローク中における位置情報を検出しながら、前記横シーラの閉動作時に前記包材筒に与えるシール圧を時間の経過とともに２段階的に変化させ、先の第１段階目のシール圧を被包装物の物性に応じて設定される検出用シール圧とし、後の第２段階目のシール圧を溶着用シール圧として横シールを行わせることで、このシール圧の変化に伴う前記位置情報の変化に基づき、前記横シーラによる被包装品の噛み込みの有無を検出することを特徴とする製袋充填機における横シーラの噛み込み検出方法。While forming a long packaging material around the filling tube in the longitudinal direction, it is fed out in the longitudinal direction, and in this feeding process, the seam of the packaging material is vertically sealed to form a packaging cylinder, and the filling tube In the bag making and filling machine that alternately performs the horizontal seal of the packaging cylinder and the cutting thereof and the filling of the packaging product from the filling tube into the packaging cylinder by the opening and closing operation of the lateral sealer at the bottom,
While detecting the position information during the opening / closing stroke of the horizontal sealer, the sealing pressure applied to the packaging cylinder during the closing operation of the horizontal sealer is changed in two stages over time, and the first stage seal The pressure is set as a seal pressure for detection that is set according to the physical properties of the package, and the seal pressure in the second stage is used as the seal pressure for welding to cause a lateral seal, so that the change in the seal pressure is accompanied by the above-mentioned A method for detecting biting of a horizontal sealer in a bag making and filling machine, wherein the presence or absence of biting of an article to be packaged by the horizontal sealer is detected based on a change in position information.
JP2001400756A 2001-12-28 2001-12-28 Horizontal sealer biting detection device and biting detection method in bag making and filling machine Expired - Lifetime JP3940600B2 (en)

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