US3624734A - Thread-cutting device on sewing machines - Google Patents

Thread-cutting device on sewing machines Download PDF

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Publication number
US3624734A
US3624734A US23239A US3624734DA US3624734A US 3624734 A US3624734 A US 3624734A US 23239 A US23239 A US 23239A US 3624734D A US3624734D A US 3624734DA US 3624734 A US3624734 A US 3624734A
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US
United States
Prior art keywords
support
thread
cutting
guide piece
cutting blades
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 - Lifetime
Application number
US23239A
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English (en)
Inventor
Helmut Schips
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Individual
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Individual
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Filing date
Publication date
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Publication of US3624734A publication Critical patent/US3624734A/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D05D2207/04—Suction or blowing devices

Definitions

  • the present invention concerns a device for use in conjunction with sewing machines for cutting the thread between successive workpieces by means of a suction tube which is arranged on the delivery side of the stitch-forming point and i which determines the position of the free thread and further by means of a pair of cutting blades of which one at least is driven.
  • Known systems for cutting the thread joining two successive workpieces have a suction tube which is arranged at a distance from the stitch-forming point of the sewing machine and which produces a suction air current parallel to the direction of the workpiece feed.
  • the free thread is first caught at a certain distance from the stitch-forming point by the suction air current and brought within reach of a pair of cutting blades which are arranged inside the suction tube and of which one is continually driven, and the thread is then cut.
  • the opening of the suction tube is provided with a deflector plate having an opening and a slot corresponding to the thickness of the thread, so that the workpiece is deflected from the suction tube while the free thread is caught by the suction air current.
  • a deflector plate having an opening and a slot corresponding to the thickness of the thread, so that the workpiece is deflected from the suction tube while the free thread is caught by the suction air current.
  • the object of the present invention is to provide a device for cutting the thread joining two successive workpieces which ensures the dependable cutting of the thread while obviating any need for additional movement of the workpiece after the actual feed movement and in the direction thereof.
  • the invention provides the solution to the problem of designing and arranging the thread-cutting device in such a manner that the thread leaving the stitch-forming tongue can be caught by the suction air current and conveyed to the cutter when it leaves the range of action of the work feed tools.
  • the solution provided hereunder consists in that the suction tube produces a suction air current which is substantially perpendicular to the work feed direction, and that there is arranged between the suction air current and the stitch-forming tongue a guide piece which has a workpiece guide surface oblique to the work feed direction and which further has a forward end surface located within the range of the suction air current and spaced from the moving blade of the pair of cutting blades at a distance extending in the work feed direction.
  • the suction air current pulls it away across the work feed direction and conveys it between the end surface of the guide piece and the end surface of the moving cutting blade into the suction tube.
  • a space-saving arrangement which also with certainty prevents any damage to the workpiece or, more particularly, to the seam formed thereon can be achieved by arranging the pair of cutting blades parallel to the work feed direction and covering both blades in the work feed direction by the forward end surface of the guide piece.
  • FIG. I shows a side view of the thread-cutting device in which the workpiece moves from right to left during the work feed movement
  • FIG. 2 shows a top view of the thread-cutting device
  • FIG. 3 shows a side view of the pair of cutting blades, with the driving link and the driving bolt
  • FIG. 4 shows a top view of FIG. 3, with a section of the driving lever.
  • reference 1 indicates a cutting-blade sup port which is fixed to the sewing machine.
  • a cutting blade 3 of the form shown in the drawings is fixed to the said support by bolts 5 and oriented parallel to the work feed direction.
  • the blade support 1 is provided at its back or upstream end facing the stitch-fonning point with a guide piece 7 which presents a guide surface 8 oblique to the work feed direction and further presents a forward end surface 9.
  • Fixed by a pivot bolt II to the blade support 1 or, more particularly, to the lower blade 3 connected to it, is an upper blade 10 which is provided at its end facing away from the knife edge with a bolting surface 14 for a driving link 16.
  • the driving link is connected to the upper blade 10 by bolts 17 extending through oblong holes and presents a slot 18 to receive a driving bolt 19.
  • the driving bolt 19 is provided with a screw thread and is screwed into a lever 27 (see FIG. 4) which is continually driven in a manner not shown and thus continually moves the upper blade I0 up and down.
  • a spring 22 is arranged between the lever 27 and the upper blade 10 to press the latter against the rigidly fixed lower blade 3.
  • the arrangement of the upper blade 10 is such that between its end surface and the forward end surface 9 of the guide piece 7 there is a gap 26 through which a suction air current, produced by a suction tube 24, can draw the thread.
  • the plane of the opening 25 of the suction tube 24 is parallel to the work feed direction and arranged behind the gap 26, so that the air current produced by the suction tube 24 is directed substantially across or transverse to the work feed direction and draws the free thread through the space between the end surface of the upper blade and the forward end surface 9 of the guide piece 7.
  • the gap 26 ensures that the suction air current produced by the suction tube is not interrupted by the continual up-and-down movement of the upper blade 10.
  • the latter As soon as it leaves the stitch-forming point, is caught within the range of the downstream toothing 30 of the fabric feeder 31 by the suction air current directed across the work feed direction. In the process, the thread rests on the lower blade 3 and is conveyed through the gap 26 to the suction tube 24. As the leading edge of the workpiece leaves the stitch-forming point, the thread is moved along in the feed direction by the feed movement of the workpiece, reaches a point under the upper blade 10 down continually moving up and down and is cut by the latter.
  • the thread-cutting device described is extremely simple in construction, very compact and can therefore be easily attached to the machine.
  • it is also extremely slender (note FIG. 2) it can be arranged opposite the rear downstream row of teeth of the fabric feeder, in which case the guide surface 8 oblique to the work feed direction prevents the workpiece from entering the range of the cutting blades.
  • the guide surface 8 oblique to the work feed direction prevents the workpiece from entering the range of the cutting blades.
  • the opening 25 of the suction tube 24 is displaced with respect to the upper blade 10 in the work feed direction and as there is a gap 26 between the end surface of the said upper blade and the forward end surface 9 of the guide piece 7, the opening of the suction tube 24 is at no moment closed by the pair of cutting blades 3,10.
  • Both the upper and the lower blade are adjustable in cutting angle by bolts designed as adjusting screws.
  • the spring 22, pressing the knife edge of the upper blade 10 against the lower blade 3, ensures a neat cut.
  • a suction tube for placement at the delivery side of the stitch-forming point of a sewing machine, and a pair of cutting blades for cutting the thread caught by suction from the suction tube, the improvement comprising an elongated support adapted to be longitudinally oriented on a sewing machine along the direction of work feed;
  • a guide piece at the upstream end of said support for location between said means to produce suction air current and the stitch-forming tongue of the sewing machine, said guide piece having a workpiece guide surface at its upstream edge and oblique to the longitudinal dimension of said support, said guide piece further having a forward end located adjacent said means to produce suction;
  • a device in accordance with claim 1 wherein said cutting blades are disposed parallel to the longitudinal dimension of said support, and wherein said forward end serves to cover said cutting blades.
  • a device in accordance with claim 1 further comprising spring means for maintaining said cutting blades tightly adjacent one another.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US23239A 1969-04-02 1970-03-27 Thread-cutting device on sewing machines Expired - Lifetime US3624734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH513669A CH507409A (de) 1969-04-02 1969-04-02 Einrichtung an Nähmaschinen zum Durchtrennen der Fadenkette

Publications (1)

Publication Number Publication Date
US3624734A true US3624734A (en) 1971-11-30

Family

ID=4288544

Family Applications (1)

Application Number Title Priority Date Filing Date
US23239A Expired - Lifetime US3624734A (en) 1969-04-02 1970-03-27 Thread-cutting device on sewing machines

Country Status (8)

Country Link
US (1) US3624734A (de)
BE (1) BE748291A (de)
CH (1) CH507409A (de)
DE (1) DE2014144A1 (de)
DK (1) DK120469B (de)
FR (1) FR2042271A5 (de)
GB (1) GB1255466A (de)
NL (1) NL7004587A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710743A (en) * 1971-06-27 1973-01-16 Singer Co Thread-cutting mechanism for sewing machines
US4038933A (en) * 1975-09-11 1977-08-02 Rockwell-Rimoldi S.P.A. Device for retaining a chain of stitches in a sewing machine
US4332209A (en) * 1979-07-13 1982-06-01 Union Special G.M.B.H. Thread trimming mechanism for sewing machines
US4582009A (en) * 1983-11-17 1986-04-15 Union Special Gmbh Sewing machine thread trimming mechanism
US5027733A (en) * 1988-05-17 1991-07-02 Schips Ag Nahautomation Sewing machine with automatic separation of pieces of sewing material
US5176084A (en) * 1991-05-16 1993-01-05 Keeton J Herbert Knife assembly for automatic sewing machines
US5203270A (en) * 1990-12-20 1993-04-20 Atlanta Attachment Company Sewing machine with latch back device
US5613454A (en) * 1994-12-29 1997-03-25 Union Special Corporation Vacuum latchtack throat plate with a vacuum generating apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4934293A (en) * 1987-12-28 1990-06-19 Pegasus Sewing Machine Mfg., Co., Ltd. Chaining thread sew-in device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989935A (en) * 1959-03-19 1961-06-27 Burlington Industries Inc Vacuum attachment for dial looping machine
US3058438A (en) * 1960-12-19 1962-10-16 Frank D De Long Jr Cutting mechanism
US3143987A (en) * 1961-10-26 1964-08-11 Union Special Maschinenfab Thread chain severing device for sewing machines
US3182620A (en) * 1963-09-03 1965-05-11 Wm G Leininger Knitting Co Surplus thread removing apparatus
US3379151A (en) * 1966-01-19 1968-04-23 Kochs Adler Ag Thread chain trimming device for sewing machines
US3465702A (en) * 1966-09-03 1969-09-09 Tokyo Juki Industrial Co Ltd Method and apparatus for treating cloth-end threads in a sewing machine
US3511202A (en) * 1968-02-28 1970-05-12 Ira Strauss Thread chain severing device for sewing machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989935A (en) * 1959-03-19 1961-06-27 Burlington Industries Inc Vacuum attachment for dial looping machine
US3058438A (en) * 1960-12-19 1962-10-16 Frank D De Long Jr Cutting mechanism
US3143987A (en) * 1961-10-26 1964-08-11 Union Special Maschinenfab Thread chain severing device for sewing machines
US3182620A (en) * 1963-09-03 1965-05-11 Wm G Leininger Knitting Co Surplus thread removing apparatus
US3379151A (en) * 1966-01-19 1968-04-23 Kochs Adler Ag Thread chain trimming device for sewing machines
US3465702A (en) * 1966-09-03 1969-09-09 Tokyo Juki Industrial Co Ltd Method and apparatus for treating cloth-end threads in a sewing machine
US3511202A (en) * 1968-02-28 1970-05-12 Ira Strauss Thread chain severing device for sewing machines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710743A (en) * 1971-06-27 1973-01-16 Singer Co Thread-cutting mechanism for sewing machines
US4038933A (en) * 1975-09-11 1977-08-02 Rockwell-Rimoldi S.P.A. Device for retaining a chain of stitches in a sewing machine
US4332209A (en) * 1979-07-13 1982-06-01 Union Special G.M.B.H. Thread trimming mechanism for sewing machines
US4582009A (en) * 1983-11-17 1986-04-15 Union Special Gmbh Sewing machine thread trimming mechanism
US5027733A (en) * 1988-05-17 1991-07-02 Schips Ag Nahautomation Sewing machine with automatic separation of pieces of sewing material
US5203270A (en) * 1990-12-20 1993-04-20 Atlanta Attachment Company Sewing machine with latch back device
US5176084A (en) * 1991-05-16 1993-01-05 Keeton J Herbert Knife assembly for automatic sewing machines
US5613454A (en) * 1994-12-29 1997-03-25 Union Special Corporation Vacuum latchtack throat plate with a vacuum generating apparatus

Also Published As

Publication number Publication date
FR2042271A5 (de) 1971-02-05
BE748291A (fr) 1970-09-16
CH507409A (de) 1971-05-15
DK120469B (da) 1971-06-01
DE2014144A1 (de) 1970-10-15
NL7004587A (de) 1970-10-06
GB1255466A (en) 1971-12-01

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