EP0420856B1 - Fadenschneideinrichtung an nähmaschinen - Google Patents

Fadenschneideinrichtung an nähmaschinen Download PDF

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Publication number
EP0420856B1
EP0420856B1 EP89905094A EP89905094A EP0420856B1 EP 0420856 B1 EP0420856 B1 EP 0420856B1 EP 89905094 A EP89905094 A EP 89905094A EP 89905094 A EP89905094 A EP 89905094A EP 0420856 B1 EP0420856 B1 EP 0420856B1
Authority
EP
European Patent Office
Prior art keywords
thread
cutting device
needle
tension
lever
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
EP89905094A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0420856A1 (de
Inventor
Albert Dusch
Karl-Heinz Walther
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.)
GM Pfaff AG
Original Assignee
GM Pfaff AG
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 GM Pfaff AG filed Critical GM Pfaff AG
Publication of EP0420856A1 publication Critical patent/EP0420856A1/de
Application granted granted Critical
Publication of EP0420856B1 publication Critical patent/EP0420856B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread

Definitions

  • the invention relates to a thread cutting device according to the preamble of claim 1.
  • a thread cutting device has become known in which an axially displaceable gear element in its one direction of movement the needle and Gripper thread is gripped and pulled out in its other direction of movement and fed to the cutting knife.
  • a control cam is attached to the gear element, which actuates the trigger mechanism.
  • the invention has for its object to form the trigger mechanism for the thread tension in a thread cutting device according to the preamble of claim 1 so that the thread tension is only opened during the tightening of the needle thread.
  • the thread tension now remains closed during the penetration of the thread catcher into the needle thread loop, so that the stability of the loop is retained when it is caught by the thread catcher.
  • the thread tension is only opened at the beginning of the pulling of the needle thread and only closes when no further thread menr is pulled.
  • Claim 2 contains a structurally simple design of the one-way clutch.
  • the measure according to claim 3 ensures a jerk-free opening of the thread tension and its immediate closing after sufficient tightening of the needle thread.
  • the base plate (1) is shown of a sewing machine, under which the horizontal hook drive shaft (2) is mounted. is. This is driven by a lower main shaft (4) via a transmission gear (3).
  • the gripper (5) is attached to the front end of the gripper drive shaft (2). It works together with the needle (6), which can be moved up and down and which is fastened in a needle bar (6a), which is only indicated.
  • a thread cutting device (7) is arranged below the base plate (1), the structure and mode of operation of which is described in DE-PS 11 25 742.
  • the thread cutting device (7) has a thread catcher (8) which is arranged coaxially to the gripper (5) and which interacts with a cutting knife (9) attached to the underside of the base plate (1).
  • the thread catcher (8) is fastened to a support arm (10) which is connected to a ring (11) which loosely surrounds the hook drive shaft (2). This is secured in the axial direction and rotatably mounted in an annular path (12) which is attached below the base plate (1).
  • a link (13) is articulated on the support arm (10) and is connected to an arm of an angle lever (14) which is supported by a bearing block (15) fixed to the housing.
  • the other arm of the angle lever (14) is connected via a rod (16) to a drive device (17) for the thread catcher (8).
  • a control cam (18) is attached to the main shaft (4), which has a control groove (19) and a control segment (20).
  • Parallel to the main shaft (4) (see also FIG. 2) is a gear element designed as an axially displaceable shaft (21) mounted in a carrier (22) fastened below the base plate (1).
  • a control lever (24) provided with a roller pin (23) and a release lever (25) are fastened to the gear element (21).
  • a pawl (28) equipped with a locking lug (26) and a stop (27) is loosely mounted on a bushing (30) fastened in a side wall (29) of the carrier (22) and is detached from the side wall (29) of the carrier ( 22) and an end flange (30a) of the bushing (30) against axial displacement.
  • the spring (31) acts as a compression spring and shifts the gear element (21) into its right end position shown in FIG. 1, in which the roller bolt (23) faces the control groove (19) when the sewing machine is in the needle down position.
  • An electromagnet (32) is fastened in the carrier (22), the armature (33) of which is connected to an arm (35) of a switch lever (36) via an eyelet (34). This is mounted in the carrier (22) and is turned upwards by a torsion spring (37) until a bent attachment (38) is applied to the locking lug (26) of the pawl (28) or - when the pawl is pivoted off - an end piece (39) pivoted to an adjustable threaded pin (40) fastened in the carrier (22).
  • the thread tension (42) (Fig. 1a) for the needle thread consists of a sleeve (43) fastened in the machine housing with a longitudinally slotted threaded bolt (44) on which two tension disks (45, 46) are arranged, which are secured by a knurled nut (47).
  • adjustable tension spring (48) are compressed to exert a braking force on the needle thread.
  • a release pin (49) is arranged in the sleeve (43) so as to be longitudinally displaceable, by means of which the tension disk (45) can be raised against the action of the tension spring (48) from the tension disk (46) in order to open the thread tension (42).
  • a control cam (50) attached to the gear element (21) (FIGS. 1 and 2) is used to actuate the release pin (49) and thus to release the thread tension (42), the surface of which is designed as a cam curve, which is wedge-shaped at one end rising curve section (51) and at the other end a straight and then radially falling curve section (52).
  • a one-way clutch (53) cooperates with the control cam (50) and is arranged on a lever arm (54) mounted on the carrier (22).
  • the one-way clutch (53) consists of a segment-like lever (55), which is rotatably mounted on the lever arm (54) and interacts with the control cam (50), as well as a stop (57), which acts under the action of a torsion spring ( 58) on a pin (59) fastened in the lever arm (54).
  • the lever arm (54) is actuated by a torsion spring (60) until a lateral contact surface (54a) or the one-way clutch (53) bears against the control cam (50). twisted.
  • the torque emanating from the torsion spring (60) considerably exceeds the torque emanating from the torsion spring (58).
  • the lever arm (54) is connected via a rod (61) to an angle lever (62) mounted on the machine housing.
  • a push rod (63) is articulated to this and carries at its front end a release element (65) provided with an inclined surface (64) (FIG. 1a).
  • the device works as follows: At the end of the seam, the sewing machine is briefly stopped in the needle down position as the starting position for thread cutting by a needle positioning device.
  • the control groove (19) in the control cam (18) assumes such a position that the roller pin (23) on the control lever (24) can be moved into the control groove (19) by a simple pivoting movement.
  • the control cam (50) and the one-way clutch (53) are in the position shown in Fig. 3, in which the thread tension (42) is closed.
  • the electromagnet (32) By actuating a switch when stepping backwards on the sewing machine, the electromagnet (32) is switched on briefly and immediately thereafter the drive motor of the sewing machine.
  • the switch lever (36) is pulled down by the armature (33) of the electromagnet (32) and presses the roller pin (23) into the control groove (19) via the release lever (25) and the control lever (24).
  • the cam groove (19) running in the axial direction moves the gear element (21) out of its rest position via the control lever (24) in accordance with a first section of the cam groove ( 19) to the left.
  • the gear element (21) moves the thread catcher (8) via the angle lever (14) and the handlebar (13) into the needle thread loop which is gripped and widened by the gripper (5) and thereby detects the leg of the needle thread loop leading to the material to be sewn and the thread Looper thread.
  • the gear element (21) is moved to the right as a result of the curve of the control groove (19) (FIG. 5).
  • the wedge-shaped curve section (51) of the control cam (50) pushes against the lever (55) of the one-way clutch (53) and pivots thereby the lever arm (54), which via the rod (61) opens the angle lever (62) and the push rod (63) the thread tension (42) for the needle thread, by the trigger pin (49) through the inclined surface (64) of the trigger element ( 65) axially displaced, thereby lifting the tension disk (45) against the action of the tension spring (48) from the tension disk (46).
  • the thread catcher (8) pulls thread from the hook and needle thread supply through the rightward movement of the gear element (21) until shortly before the end of this movement, the cutting knife (9) attached to the underside of the base plate (1) cuts off both threads.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89905094A 1988-06-06 1989-04-26 Fadenschneideinrichtung an nähmaschinen Expired - Lifetime EP0420856B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3819135A DE3819135C1 (enrdf_load_stackoverflow) 1988-06-06 1988-06-06
DE3819135 1988-06-06

Publications (2)

Publication Number Publication Date
EP0420856A1 EP0420856A1 (de) 1991-04-10
EP0420856B1 true EP0420856B1 (de) 1992-12-02

Family

ID=6355922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89905094A Expired - Lifetime EP0420856B1 (de) 1988-06-06 1989-04-26 Fadenschneideinrichtung an nähmaschinen

Country Status (8)

Country Link
US (1) US5113774A (enrdf_load_stackoverflow)
EP (1) EP0420856B1 (enrdf_load_stackoverflow)
JP (1) JPH03504809A (enrdf_load_stackoverflow)
KR (1) KR960015663B1 (enrdf_load_stackoverflow)
BR (1) BR8907056A (enrdf_load_stackoverflow)
DE (1) DE3819135C1 (enrdf_load_stackoverflow)
ES (1) ES2013511A6 (enrdf_load_stackoverflow)
WO (1) WO1989012129A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07100093B2 (ja) * 1989-10-31 1995-11-01 ブラザー工業株式会社 糸切り機構付きミシン
DE4118008A1 (de) * 1990-11-30 1992-06-11 Pfaff Ag G M Verfahren und vorrichtung zum verkuerzen des nadelfadenendes zu naehbeginn bei doppelsteppstich-naehmaschinen
US5289791A (en) * 1993-03-31 1994-03-01 General Motors Corporation Sewing machine with thread wiper and auxiliary cutter
CN1036017C (zh) * 1993-09-18 1997-10-01 高林股份有限公司 多支针缝纫机的线切断装置
CN1036214C (zh) * 1994-04-08 1997-10-22 高林股份有限公司 多支针缝纫机的线切断装置
JP4074533B2 (ja) * 2003-03-06 2008-04-09 セイコーエプソン株式会社 電気光学装置及び電子機器
CN108914413B (zh) * 2018-09-10 2021-01-05 拓卡奔马机电科技有限公司 一种缝纫机

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1125742B (de) * 1961-08-11 1962-03-15 Pfaff Ag G M Fadenabschneideeinrichtung an Naehmaschinen
US3141432A (en) * 1962-04-26 1964-07-21 Pfaff Ag G M Thread-trimming mechanism for sewing machines
US3386402A (en) * 1966-07-05 1968-06-04 Singer Co Thread trimming mechanism for sewing machines
DE2325564C2 (de) * 1973-05-19 1974-09-05 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Kettenstich-Nähmaschine mit einer Einrichtung zum Fadenschneidea
DE7912758U1 (de) * 1979-05-03 1979-07-26 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenschneidvorrichtung an naehmaschinen
US4365568A (en) * 1980-05-15 1982-12-28 The Singer Company Underbed thread trimmer and controlled single-operation cam mechanism therefor
DE3124795C1 (de) * 1981-06-24 1982-11-04 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenabschneidvorrichtung fuer Zickzack-Naehmaschinen
DE3244996C2 (de) * 1982-12-04 1985-04-04 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenschneidvorrichtung an Nähmaschinen
US4611547A (en) * 1984-06-13 1986-09-16 Janome Sewing Machine Co., Ltd. Upper thread tension device of a sewing machine
DE3529369C1 (de) * 1985-08-16 1986-11-27 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Naehmaschine mit einer Einrichtung zur Spannung des Nadelfadens

Also Published As

Publication number Publication date
JPH03504809A (ja) 1991-10-24
EP0420856A1 (de) 1991-04-10
BR8907056A (pt) 1991-01-02
WO1989012129A1 (en) 1989-12-14
ES2013511A6 (es) 1990-05-01
KR900700679A (ko) 1990-08-16
US5113774A (en) 1992-05-19
KR960015663B1 (ko) 1996-11-20
DE3819135C1 (enrdf_load_stackoverflow) 1989-07-13
JPH0528640B2 (enrdf_load_stackoverflow) 1993-04-26

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