EP0112949B1 - Nähmaschine und Verfahren - Google Patents

Nähmaschine und Verfahren Download PDF

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Publication number
EP0112949B1
EP0112949B1 EP19820307007 EP82307007A EP0112949B1 EP 0112949 B1 EP0112949 B1 EP 0112949B1 EP 19820307007 EP19820307007 EP 19820307007 EP 82307007 A EP82307007 A EP 82307007A EP 0112949 B1 EP0112949 B1 EP 0112949B1
Authority
EP
European Patent Office
Prior art keywords
needle
mechanical oscillations
reciprocation
cycle
reciprocating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19820307007
Other languages
English (en)
French (fr)
Other versions
EP0112949A1 (de
Inventor
Kiyoshi Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inoue Japax Research Inc
Original Assignee
Inoue Japax Research Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inoue Japax Research Inc filed Critical Inoue Japax Research Inc
Priority to EP19820307007 priority Critical patent/EP0112949B1/de
Priority to DE8282307007T priority patent/DE3275108D1/de
Priority to DE1982307007 priority patent/DE112949T1/de
Publication of EP0112949A1 publication Critical patent/EP0112949A1/de
Application granted granted Critical
Publication of EP0112949B1 publication Critical patent/EP0112949B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B81/00—Sewing machines incorporating devices serving purposes other than sewing, e.g. for blowing air, for grinding

Definitions

  • the present invention relates to the sewing art and, more particularly, to improvements in a sewing method and apparatus wherein a needle carrying a thread is axially reciprocated into and through a sewable material, e.g. cloth, leather or paper, which is moving relative to axis of needle, to stitch the material.
  • a needle carrying a thread is axially reciprocated into and through a sewable material, e.g. cloth, leather or paper, which is moving relative to axis of needle, to stitch the material.
  • Sewing machines which use ultrasonic energy to aid the sewing operation.
  • British Patent Specification No. 1 115 170 discloses a sewing machine using an ultrasonically-vibrated rod to apply ultrasonic energy to a stitch after it has been formed by the needle. This action is to soften the area around the thread so as to reinforce the stitch.
  • This operation while reinforcing the seam does not improve the actual stitching operation, that is the action of the needle passing through the sewable material.
  • Another important object of the present invention is to provide a relatively simple and compact sewing machine for carrying out the improved method described.
  • a further important object of the present invention is to provide a sewing machine as described which has one or more additional functions of cutting, welding and marking sewable or sewed materials.
  • a sewing method using high frequency oscillation wherein a needle carrying a thread is axially reciprocated into and through a sewable material moving relative to the axis of the needle to stitch the material, characterized by the step of imparting the high-frequency mechanical oscillations to the reciprocating needle (1) and substantially in a direction of the needle reciprocation.
  • the mechanical oscillations imparted to said reciprocating needle are produced or intensified selectively during the advanced stroke of each cycle of the needle reciprocation.
  • a load of the needle experienced from the material during each cycle of the needle reciprocation is sensed and, when a predetermined change in the load is sensed, the amplitude of the mechanical oscillations is increased from nil or a predetermined minimum level.
  • the invention also provides, in a second aspect thereof, a sewing machine wherein a needle carrying a thread is axially reciprocated into and through a sewable material moving relative to the axis of the needle to stitch the material, the machine including means for imparting high-frequency mechanical oscillations characterized in that said high-frequency mechanical oscillations are applied to the reciprocating needle (1) and substantially in a direction of the reciprocation.
  • the machine further comprises means associated with the said means for producing or intensifying the mechanical oscillations imparted to the reciprocating needle selectively during at least a time period in which the needle is advanced into and through the material in each cycle of the needle reciprocation.
  • the oscillation means may comprise an electromechanical transducer connectable in an oscillation transmitting relationship with said needle and a power supply for energizing the electromechanical transducer to impart said mechanical vibrations to said reciprocating needle.
  • the machine may further comprise sensing means responsive to a load experienced by the needle from the material during each cycle of the needle reciprocation and control means responsive to an increase in the load for controlling the power supply to produce or intensify the mechanical oscillations imparted to the needle selectively during at least a time period in which the needle is advanced into and through the material in each cycle of the needle reciprocation.
  • a sewing machine may have a conventional basic structure and makes use of a needle 1 which is formed at a free end portion thereof with an aperture 1a having a thread (not shown) passed therethrough.
  • the needle 1 is securely held by means of a chuck 2 to an end (lower) portion of a rod 3.
  • the needle 1 is here supported coaxially with the rod 3 and may extend vertically, perpendicularly to a material 4, e.g. cloth, leather or paper, to be stitched.
  • the rod 3 is supported by a pair of bearing assemblies 5 so as to be vertically movable up and down or capable of vertical reciprocation, and is held thereby against lateral movement and rotation.
  • the rod 3 is vertically or axially reciprocated by a motor 6 via a crank 7 including a crankshaft 7a to which the output shaft of the motor 6 is drivingly coupled via a gear transmission (not shown) and a crank pin 7b secured to the rod 3.
  • the needle 1 is thus axially reciprocated into and through the material 4 moving manually or otherwise relative to the axis of the needle 1 to stitch the material 4.
  • an electromechanical transducer 8 Shown secured to the upper end of the rod 3 is an electromechanical transducer 8 which is energized by a power supply unit 9 to impart high-frequency mechanical oscillations to the reciprocating needle 1 in its axial or longitudinal direction.
  • the transducer 8 and the power supply unit 9 themselves are conventional in design and are commercially available.
  • the power supply unit 9 is here mounted on a casing 10 secured to a frame 11 of the machine which has also the bearing assemblies 5 secured thereto.
  • the transducer 8 is secured to the rod 3 by means of a bolt 12.
  • the rod 3 is configured to serve as a horn for propagating and amplifying sonic or ultrasonic oscillatory signals produced in the transducer 8 to the needle 1.
  • the motor 6 is accommodated on a suitable support within the casing 10.
  • the reciprocating needle 1, according to the present invention is axially oscillated with an amplitude of the oscillations, for example, of 20um. This results in an oscillatory advancement of the needle 1 in each cycle of reciprocation in which an oscillation occurs each time the needle advances by a distance of 20 to 30 pm. During the advance stroke of each cycle of reciprocation, a plurality of oscillations should be experienced by the needle 1.
  • the mechanical oscillations imparted to the reciprocating needle 1 are imparted selectively during the advanced stroke of each cycle of needle reciprocation.
  • the mechanical oscillations may be damped selectively during the retraction stroke of each cycle of needle reciprocation.
  • FIG. 2 there is shown a circuit arrangement which enables such a modified mode of imparting mechanical oscillations to the reciprocating needle 1 to be executed.
  • a sensor 12 is associated with the motor 6 to measure changes in the load of the crank 7 connected to the output of the motor 6.
  • FIG. 3 shows in graph (A) how the load changes over the advance strokes (Ta) and retraction strokes (Tr) in the reciprocation of the needle through the material 4.
  • the sensor 12 responsive to the changes in the load provides switching or control signals which act on the power supply 9 to actuate or increase the vibrational amplitude of the transducer 8 selectively during the advance stroke of each cycle of needle reciprocation.
  • FIG. 3 shows a resulting controlled mode of mechanical oscillations in which the reciprocating needle 1 is mechanically oscillated selectively during the advance stroke.
  • a controlled mode is advantageous in that it achieves results substantially same as where the reciprocating needle 1 is oscillated over the entire cycles of reciprocation and at the same time significantly reduces noises produced by the needle oscillations.
  • FIG. 3 it is shown that the amplitude of mechanical vibrations is maximized when the needle 1 experiences the highest magnitude of load.
  • Alternative manners of sensing the changes in the load include provision of a strain gauge on an element in the crank 7 such as the crankshaft 7a to measure strains thereof.
  • a sewing machine as described may have one or more additional functions of cutting, welding and marking sewable materials 4.
  • the casing 10 is securely carried by a collar 13 which is rotatably fitted onto a column 14.
  • the collar 14 is designed to carry further frames 15 and 16 by means of arms 17 and 18, respectively, which are both secured to the collar 13.
  • the frames 15 and 16 are provided to carry sonic or ultrasonic cutting and welding/marking tools 19 and 20 as shown in FIGS. 5 and 6, respectively.
  • the cutting tool 19 shown in FIG. 5 comprises a cutter 21 having a cutting edge 21a and secured by means of of a bolt to holder 22 in the form of a horn at one end thereof which is of smaller cross- section.
  • the other (upper) end of the horn holder 22 has an electrochemical transducer 23 secured thereto by means of a bolt.
  • the cutting tool 19 is supported in the frame 15 so as to be movable up and down and vertically positionable to locate the edge 21a in cutting relationship with the sewable or sewed material 4.
  • the transducer 23 is energized by a power supply 24 (FIG. 4) to impart high-frequency mechanical oscillations to the edge 21a via the amplifier horn holder 22 to cut the material 4 which is moved along a desired cutting path.
  • the welding tool 20 in FIG. 6 may be used to weld pieces of thermoplastic resinous, sewable or sewed material(s) at its free end (lower) portion and is secured by means of a bolt to a horn holder 26 at one end thereof which has a smaller cross- section.
  • the other (upper) end of the horn holder 26 here again has an electromechanical transducer 27 secured thereto by means of a bolt.
  • the welding tool 20 is supported in the frame 16 so as to be movable up and down and vertically positionable to locate the shoe 25a in a welding relationship with two or more overlapped pieces of the sewed or sewable material(s) 4.
  • the transducer 27 is energized by a power supply 28 (FIG. 4) to impart high-frequency mechanical oscillations to the shoe 25a via the amplifier horn 26 to weld the overlapped pieces together which may be moved along a desired welding path. A desired mark may be marked as well in this manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (10)

1. Nähverfahren unter Verwendung von Hochfrequenzschwingungen, bei dem eine einen Faden haltende Nadel axial hin und her und dabei in einen sich relativ zur Nadelachse fortbewegenden nähbaren Werkstoff hinein- und durch ihn hindurchgeht, um ihn zu nähen, dadurch gekennzeichnet, daß die hin- und hergehende Nadel (1) im wesentlichen in Richtung ihrer Hin- und Herbewegung in hochfrequente mechanische Schwingungen versetzt wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die der hin- und hergehenden Nadel (1) aufgegebenen mechanischen Schwingungen in jedem Zyklus der Nadelbewegung während des Vorwärtshubs bzw. Einstichhubs erzeugt werden.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die der hin- und hergehenden Nadel (1) aufgegebenen mechanischen Schwingungen in jedem Zyklus der Nadelbewegung während des Vorwärtshubs bzw. Einstichhubs verstärkt werden.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die vom Werkstoff herrührende Belastung der Nadel (1) während jedes Nadelzyklus gemessen wird und daß auf einer Änderung der gemessenen Belastung hin die Amplitude der mechanischen Schwingungen automatisch vergrößert wird.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Amplitude der mechanischen Schwingungen von fast Null an gesteigert wird.
6. Nähmaschine, bei der eine einen Faben haltende Nadel axial hin- und hergeht und dabei in einem sich relativ zur Nadelachse bewegenden nähbaren Werkstoff hinein- und durch ihn hindurchgeht, um ihn zu nähen, und die Einrichtungen zur Erzeugung von hochfrequenten mechanischen Schwingungen enthält, dadurch gekennzeichnet, daß die hochfrequenten mechanischen Schwingungen auf die hin- und hergehende Nadel (1) im wesentlichen in Richtung der Nadelbewegung aufgebracht sind.
7. Maschine nach Anspruch 6; gekennzeichnet durch eine Einrichtung (12'), die mit der Vorrichtung (8) zur Aufgabe der mechanischen Schwingungen auf die hin- und hergehende Nadel zusammenwirkt und die Schwingungen in jedem einzelnen Zyklus der Nadelbewegung während wenigstens des Zeitraums, in welchem die Nadel in den Werkstoff hinein- und durch ihn hindurchgestochen wird, erzeugt.
8. Maschine nach Anspruch 6, gekennzeichnet durch eine Einrichtung, die mit die Einrichtung (12'), welche die mechanischen Schwingungen in jedem einzelnen Zyklus der Nadelbewegung während wenigstens des Zeitraums, im welchem die Nadel (1) in den Werkstoff hinein- und durch ihn hindurchgestochen wird, auf die hin- und hergehende Nadel aufgibt, zusammenwirkt und diese Schwingungen verstärkt.
9. Maschine nach Anspruch 6, gekennzeichnet durch eine Einrichtung (8) zur Aufgabe mechanischer Schwingungen auf die hin- und hergehende Nadel (1), mit einem elektromagnetischen, schwingungsübertragend mit der Nadel (1) verbindbaren Wandler und mit einer Kraftquelle zum Antrieb des elektromagnetischen Wandlers (8).
10. Maschine nach Anspruch 9, gekennzeichnet durch einen Fühler (12'), der in jedem Zyklus der Nadelbewegung auf die vom Werkstoff (4) auf die Nadel (1) ausgeübte Belastung anspricht, und durch eine Steuervorrichtung, die während wenigstens des Zeitraums, in den die Nadel in jedem Zyklus der Nadelbewegung in den Werkstoff hinein- und durch ihn hindurchgestochen wird, auf einen Anstieg dieser Belastung anspricht und die Kraftquelle zwecks Erzeugung einer Verstärkung der der Nadel aufgegebenen mechanischen Schwingungen ansteuert.
EP19820307007 1982-12-30 1982-12-30 Nähmaschine und Verfahren Expired EP0112949B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19820307007 EP0112949B1 (de) 1982-12-30 1982-12-30 Nähmaschine und Verfahren
DE8282307007T DE3275108D1 (en) 1982-12-30 1982-12-30 Sewing method and machine
DE1982307007 DE112949T1 (de) 1982-12-30 1982-12-30 Naehmaschine und verfahren.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820307007 EP0112949B1 (de) 1982-12-30 1982-12-30 Nähmaschine und Verfahren

Publications (2)

Publication Number Publication Date
EP0112949A1 EP0112949A1 (de) 1984-07-11
EP0112949B1 true EP0112949B1 (de) 1987-01-14

Family

ID=8189883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820307007 Expired EP0112949B1 (de) 1982-12-30 1982-12-30 Nähmaschine und Verfahren

Country Status (2)

Country Link
EP (1) EP0112949B1 (de)
DE (2) DE3275108D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2697289B2 (ja) * 1990-11-10 1998-01-14 ブラザー工業株式会社 ミシンのための駆動装置
JPH0793998B2 (ja) * 1990-11-28 1995-10-11 ブラザー工業株式会社 ミシンモータの回転制御装置
GB2267717A (en) * 1992-06-09 1993-12-15 Brother Ind Ltd Rotation control device for sewing machine motor
EP1674603A1 (de) * 2004-12-27 2006-06-28 Ferdinand Schmetz Gmbh Nadelhalterung für eine Nähmaschinennadel und Nähmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1083745A (fr) * 1953-07-16 1955-01-12 Procédé et dispositif pour assembler et coudre les tissus en matières thermoplastiques ou autres
CH361154A (de) * 1956-10-22 1962-03-31 Philips Nv Ultraschall-Werkzeugmaschine
US3296990A (en) * 1964-09-01 1967-01-10 Luther G Simjian Method for reinforcing sewn material
GB1094115A (en) * 1965-04-28 1967-12-06 Osoboe K Buro Proektorivaniyu Method of and apparatus for ultrasonic boring of hard materials
GB1115170A (en) * 1966-10-14 1968-05-29 Luther George Simjian Method for reinforcing sewn material
US3724566A (en) * 1971-09-17 1973-04-03 F Staros Device for ultrasonic broaching of a group of holes
DE2544165C3 (de) * 1975-10-03 1978-08-10 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Einrichtung an Nähmaschinen zum Vorlochen des Nähgutes
CH615965A5 (en) * 1977-07-07 1980-02-29 Gegauf Fritz Ag Ultrasonic sewing machine
US4305339A (en) * 1979-09-28 1981-12-15 Vortec Corporation Vortex tube assembly for cooling sewing machine needle

Also Published As

Publication number Publication date
DE112949T1 (de) 1985-02-14
DE3275108D1 (en) 1987-02-19
EP0112949A1 (de) 1984-07-11

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