US3905314A - Thread cutting device in embroidering machines - Google Patents

Thread cutting device in embroidering machines Download PDF

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Publication number
US3905314A
US3905314A US502950A US50295074A US3905314A US 3905314 A US3905314 A US 3905314A US 502950 A US502950 A US 502950A US 50295074 A US50295074 A US 50295074A US 3905314 A US3905314 A US 3905314A
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United States
Prior art keywords
thread
scissors
sleeve
needle
upper portion
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Expired - Lifetime
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US502950A
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English (en)
Inventor
Kurt Bolldorf
Edgar Busch
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Pfaff Industriemaschinen GmbH
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Pfaff Industriemaschinen GmbH
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    • 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
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/20—Arrangements for cutting the needle or lower threads
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2203/00—Selection of machines, accessories or parts of the same kind

Definitions

  • a thread cutting device for use with embroidering machines for clamping and cutting needle thread held by an operating needle comprises a scissors including a lower portion and an upper portion movable relative to said lower portion, each having a cooperative cutting edge.
  • the scissors are closable by relative movement between the upper and lower portions to cut a thread therebetween.
  • the clamping plate which rests on the upper plate portion has an edge portion which is generally parallel to the edge of the lower plate portion but which overlaps the lower plate portion so that the upper portion engages between the clamping plate and the lower portion and the relative closing movement between the upper and lower plate causes a clamping of the thread before it is cut.
  • the scissors are supported on a sleevemember which may be rotated to shift the upper and lower portions relatively and to an operative position at the location of the needle only when the plate portions have been lowered so that they are directly adjacent the workpiece.
  • the upper and lower plate portions of the scissors are also mounted so that they are moved after clamping of the thread to an intermediate position which is slightly removed from the operating position in a lateral direction, and they may be moved further laterally to a rest position at which the upper and lower portions are again opened.
  • This invention relates in general to the construction of thread cutting devices and, in particular, to a new and useful device for use in embroidering machines for clamping and cutting needle thread.
  • the needle thread is clamped between the upper side of the thread catching plateand the front face of a suction nozzle, and it is cut along its length located between the fabric and the underside of the thread catching plate with the aid of a knife moved by an electromagnet.
  • the free end of the needle thread is brought into the cutting position again and is cut with the aid of the knife which becomes effective for the second time.
  • the loose thread piece is carried away, after the second cutting operation, with a suction air flow through the suction nozzle.
  • Thread cutting devices of this kind are very expensive in construction, since in addition to the driven cutting knife, they require a thread catching plate which becomes effective under controlled conditions, a suction air flow and also an additional movement of the embroidery frame for the sole purpose of catching the thread. Furthermore, since the needle thread is cut twice, i.e., after affecting the first cut, a certain length is separated from the free end of the thread to avoid having too long a thread at the beginning of the next embroidery pattern. Thread cutting devices of this nature require a great amount of time for their operation, and this considerably affects the performance of .the embroidering machine.
  • the present invention is directed to a device for cutting the needle thread in embroidering machines which makes it possible to omit the up-to-date necessary shortening of the free needle thread end after the formation of the initial stitches of the embroidery pattern to be manufactured, and after the thread cut, and at the same time, the device ensures short thread ends.
  • a clamping plate which is brought into the path of the needle thread
  • the cutting tool is designed as a thread scissors having a lower portion and an upper portion movable relative thereto and includes a clamping plate resting on the upper portion in frictional contract therewith and overlapping the cutting edge of the lower portion and the thread scissors when in a closed position, and which is movable into an intermediate position provided between its working and rest positions.
  • a particularly short free end of the needle thread, as well as a minimum distance between the working position and the rest position of the thread scissors, permitting a faster putting into operation of the thread cutting device may be obtained.
  • the thread scissors is situated in the intermediate position substantially in the plane of its working position while in its rest position, the thread scissors is situated laterally of the plane of its working position. Due to such an arrangement, the free end of the needle thread is cut to a very short, and thereby negligible, length of some millimeters.
  • the thread scissors does not interfere with the formation of the stitch, not even at the most frequent repeating of the pattern.
  • a constructionally simple solution of the motion of the thread scissors can be obtained so that the thread scissors is moved along a path of motion formed of two components and, to this end, is supported by a sleeve which is pivotally mounted and longitudinally displaceable on a pivot which is fixed to the housing.
  • the needle thread is to be cut as close as possible to the manufactured embroidery pattern and, at the same time, damaging of the embroidery pattern is to be securely avoided, it is advantageous to dispose the pivot at an acute angle relative to the path of travel of the needle. Then, the thread scissors moves along a path which is-inclined relative to the plane of the fabric and comes into contact with the finished embroidery pattern only in its working position.
  • the sleeve is provided with a locking means preventing rotation.
  • the mechanism cooperates with a guide track which is fixed to the housing and it prevents the rotation of the sleeve along a length corresponding to the distance between the working and the rest position of the thread scissors but releases the sleeve below this length.
  • the locking means comprises a forked member firmly connected to the sleeve and that the guide track has a cutout in the zone corresponding to the working plane of the thread scissors permitting a leg of the forked member to pass therethrough.
  • one of the legs is shorter than the other and its width is at least equal to the distance of its pivotal motion and its height corresponds substantially to the height of the cutout of the guide track.
  • the sleeve is non-rotatably connected to a drive gear whose mating gear which is actuated by a swing lever-is supported by a carrier which is mounted coaxially of the sleeve and rigidly connected to the same in the longitudinal direction of the sleeve and is secured against rotary motion about the pivot of the sleeve.
  • the carrier is provided, in accordance with a further development of the invention, with a stop pin which projects into the path of motion of the upper portion of the thread scissors and cooperates with two stop surfaces which are provided on the upper portion of the thread scissors.
  • the upper portion of the scissors is mounted on the lower portion and extends in a certain angle thereto. Thereby, the upper portion of the thread scissors is pivoted along with the lower portion about the axis of the sleeve until one of its stop surfaces applies against the stop pin which is stationary relative to the housing.
  • the lower portion While the upper portion remains in this position, the lower portion continues to pivot about the axis and actuates thereby the closing motion of the thread scissors. During the subsequent back motion of the thread scissors, the upper and lower portions move again along with each other about the axis of the sleeve until the other stop surface of the upper portion comes to apply against the stop pin, whereby, the thread scissors is opened.
  • this solution offers an additional possibility of adjusting the instant at which the closing or opening motion has to begin, by changing the distance or the mutual angular position of the stop surfaces.
  • the carrier is provided with a forked extension cooperating with the guide track and having a height which is greater than the height of the cutout of the guide track.
  • a simple and space-saving constructional arrangement may be obtained by disposing the carrier on the sleeve between the forked member and the drive gear.
  • an object of the invention to provide an improved device for use in embroidering machines for clamping and cutting needle thread, which includes a scissors having a lower portion and an upper portion which are movable relatively, with each having a cutting edge with a clamping plate being carried by the upper portion in a position such that when the upper and lower portions are moved relatively to close them, the upper portion moves between the clamping plate and the lower portion, so that the thread is clamped during the cutting operation, and wherein the scissors are carried on an oscillatable sleeve which is driven to move the upper and lower portions together and relatively during each cutting operation, but only after they are first moved downwardly into a location directly adjacent the thread on the workpiece and which thereafter moves the clamped thread with the scissors to an intermediate position and then to a rest position removed therefrom.
  • a further object of the invention is to provide a device for use with embroidery machines for clamping and cutting needle thread, which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a lateral elevational view of an embroidering machine equipped with the inventive thread cutting device
  • FIG. 2 is a sectional view taken along the line IIII of FIG. 1, the thread scissors being in its rest position;
  • FIG. 3 is a sectional view taken along the line IIII of FIG. 1, the thread scissors being in its working position;
  • FIG. 4 is a sectional view taken along the line II-II of FIG. 1, the thread scissors being in an intermediate position;
  • FIG. 5 is a view similar to that of FIG. 1, the thread scissors being in its working position.
  • the invention embodied therein, comprises a device for use in embroiden'ng machines for clamping and cutting needle thread 70, which is passed through a workpiece or fabric 1 to be embroidered.
  • the workpiece or fabric 1 is received in an embroidery frame (not shown) and advances in the direction of the arrow A during the reciprocation of a needle 2 which is carried on a needle bar 3.
  • Needle bar 3 driven by a control shaft 4 which is common for all of theneedles 2 of the embroidery machine and which are arranged in a single line (not shown). Needle 2 can be stopped in an extreme position remote from the web fabric.
  • Each embroidery zone is equipped with a fabric presser (not shown) as well as with a piercer and its respective drive means (also not shown).
  • the device includes a base plate 6, supporting a pivot 7 and the thread cutting device is secured to the pivot 7 which faces web 1.
  • the plate is carried on a housing 5 which accommodates needle bar 3, and the fabric presser and piercer, which have not been shown.
  • Pivot 7 is disposed at an acute angle, for example, of from 2 to 5 relative to the axis of needle bar 3, and it supports a sleeve 8 which is mounted thereon for longitudinal displacement and for pivotal motion.
  • a forked member 9 is clamped to the upper end of the sleeve 8 and it is guided upon a bolt 10 which has squared sides and which is secured to the base plate 6.
  • the bolt 10 has a longitudinal axis which is parallel to the longitudinal axis of pivot 7.
  • bolt 10 is flattened and forms a guide track 11 for the forked end of member 9 which has legs 12 and 13 which engage on respective sides of track 11 and are movable therealong for a predetermined distance.
  • track 11 is provided with a cutout 14 of a size to accommodate leg 13, which is shorter than leg 12. The cutout is dimensioned so that during the pivotal movement of sleeve 8 about pivot 7, the shorter leg 13 of forked member 9 may be moved within the cutout.
  • leg 13 corresponds to the height of the cutout, and its width corresponds to the angular distance of its pivotal movement, forked member 9 and thus also sleeve 8 which is rigidly connected thereto, are secured against axial displacement during the entire time of their pivoting.
  • Thread scissors 16 has an extension 15 adjacent its lower end for supporting a thread scissors, generally designated 16.
  • thread scissors 16 includes a lower portion 17 and an upper portion 18.
  • Lower portion 17 of thread scissors 16 comprises a cutting edge 19 and a flange 20 which is secured in a recess 21 of an extension 15 which forms a fitting surface.
  • Upper portion 18 of thread scissors 16 comprises a cutting edge and is pivoted to lower portion 17 on a trunnion screw 22 and it is movable thereon relative to lower portion 17.
  • Clamping plate 23 rests on the free end of the upper portion in frictional engagement therewith, and is secured on trunnion screw 22 so that it overlaps the cutting edge of lower portion 17 in the open state of thread scissors 16.
  • the free end of clamping plate 23 remote from cutting edges 25 and 19 extends at a right angle from the remaining portion and engages a recess 24 in the lower portion 17 of thread scissors 16.
  • upper portion 18 is provided with two stop surfaces 26 and 27 which are located laterally of its cutting edge 25 and they cooperate with the free end of a stop pin 28 in order to start and stop the relative motion between the upper and lower portions.
  • the other end of stop pin 28 is secured to an arm 29 of a carrier 30.
  • Carrier 30 is disposed coaxially of sleeve 8 between forked member 9 and a drive gear 31 which is non-rotatably connected to sleeve 8 and thereby secured against axial displacement.
  • Carrier 30 is rotatably mounted on sleeve 8 and includes a forked extension 32 which embraces guide track 11 and thereby secures the carrier 30 against rotation about pivot 7.
  • the height of the extension 32 is slightly greater than the height of the cutout 14 of guide track 1 1 in order that carrier 30 may be secured against rotation even during the period where extension 32 passes through the level of cutout 14.
  • Mating gear 35 receives its motion which is to be transmitted to drive gear 31, and theeby to sleeve 8, from a swing lever which is fixed to hub 37 of gear 35, and is driven off shaft 41 common for all of the embroidery zones disposed in one line through a link 39 and a swing arm 40.
  • thread scissors 16 will remain in a rest position, as indicated in FIGS. 1 and 2. In this position, the clamping plate resting on the upper portion 18 overlaps the cutting edge 19 of the lower portion 17 and stop surface 26 applies against stop pin 28. Both forked member 9 and forked extension 32 of carrier 30 are in a position above cutout 14 of guide track 11 so that both sleeve 8 and carrier 30 are secured against rotation about pivot 7 and thread scissors 16 is in a position laterally spaced from the web of fabric 1.
  • needle bar 3 is stopped, in a well known manner, and in its position remote from the web of fabric 1, as shown in FIG. 1.
  • the needle thread extendsfrom the last stitch of the embroidery pattern through the eye of needle 2 and outwardly therefrom, but not shown, and to the thread delivery.
  • leg 13 of forked member 9 releases sleeve 8 for a counterclockwise pivotal move ment about pivot 7 so that while shaft 41 continues to move, leg 13 is introduced into cutout 14 of guide track 11. Because leg 13 is slightly wider than the corresponding distance of its pivotal movement, it remains within the space of cutout 14 during the entire pivotal movement of sleeve 8, thereby securing the latter from axial displacement, as shown in FIG. 5.
  • the needle thread end which remains connected to the thread delivery is thereby clamped in scissors 16 between upper porition 18 and clamping plate 23.
  • the thread end remaining with the embroidery is cut close to the embroidery pattern while ensuring that the embroidery is not damaged and this is due to the fact that sleeve 8 and also thread scissors 16 move along paths which are inclined relative to the plane of the web of fabric 1.
  • Thread scissors 16 As soon as thread scissors 16 comes into a position outside the path of motion of needle 2, shaft 41 is stopped. Thread scissors 16, which is still closed, occupies an intermediate position, as shown in FIG. 4, in which it continues to be located in the closed state in a zone immediately adjacent the zone of the stitch formation, but in a position in which it does not hinder the formation of the stitches.
  • sleeve 8 which is secured against rotation, but released for an axial displacement, is shifted along pivot 7 and brought into its rest position which is remote from the web of fabric 1. In this position, it does not hinder the stitch formation, not even at a most frequent repeating of the stitch formation.
  • a device for use with embroidery machines for clamping and cutting needle thread held by an operating needle comprising a scissors including a lower portion and an upper portion movable relatively thereto, each of said upper and lower portions having a cooperative cutting edge, a clamping plate resting on said upper plate and having an edge spaced from said lower portion cutting edge and overlapping said lower portion, the cutting edge of said upper portion being movable during closing between said clamping plate and said lower portion to clamp the thread therebetween, and means for moving said upper portion, said lower portion and said clamping plate relatively and together to close them around the thread at a location of the needle and to clamp the needle and cut it, and to move all of said upper portion, said lower portion and said clamping plate to an intermediate position with the clamped thread, and thereafter to move said upper portion, lower portion and said clamping plate relatively to open the scissors and to position them in a rest position spaced from said intermediate position and release the thread end.
  • a device wherein said scissors is situated substantially in the same plane in its in termediate position and its working position, and is situated in its rest position at a plane spaced laterally from the plane of its working position.
  • a device including a sleeve carrying said upper and lower plate portions of said scissors and said clamping plate, the housing having a pivot supporting said sleeve for rotational and axial movement.
  • a device including a bolt defining a guide track for said sleeve, said sleeve having arm means thereon engageable with said track during its movement which lock said sleeve against rotatable movement during a portion of its movement therealong but which permit rotational movement when said sleeve moves beyond a predetermined position on said guide track, the distance of movement along said guide track corresponding to the distance between the working plane and the rest plane of said scissors.
  • a device including a member connected to said sleeve having a forked end with leg portions on each side of said guide bolt, said guide bolt having a cutout portion corresponding to the location of the working plane of said scissors accommodating a leg of said forked member.
  • one of said legs of said forked member is shorter than the other, said shorter leg being pivotal with said sleeve and the width of said shorter leg being at least equal to the distance of its pivotal motion, and the height of said shorter leg being substantially equal to the height of said cutout portion of said guide track.
  • a device including a drive gear connected to said sleeve, a mating gear driving said drive gear, a swing lever connected to said mating gear to rotate said mating gear, a carrier mounted coaxially on said sleeve and supporting said swing lever and connected to said pivot so as to be non-rotatable in respect thereto.
  • said carrier includes a stop pin projecting into the path of motion of said upper portion of said scissors, said upper portion having an arm with two stop surfaces which are cooperable with said stop pin, said upper and lower portions of said scissors being pivoted together and relatively upon engagement of one of said stop surfaces with said stop pin.
  • said carrier includes a forked extension cooperating with said guide bolt and having a greater height than said cutout portion.
  • a device wherein said guide track has a lower end with an adjustable abutment thereon, and an extension of said carrier engaged on said abutment.
  • a device wherein said carrier is disposed between said forked member and said drive gear.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US502950A 1973-09-05 1974-09-04 Thread cutting device in embroidering machines Expired - Lifetime US3905314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2344720A DE2344720C3 (de) 1973-09-05 1973-09-05 Einrichtung an Stickmaschinen zum Klemmen und Schneiden des Nadelfadens

Publications (1)

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US3905314A true US3905314A (en) 1975-09-16

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US502950A Expired - Lifetime US3905314A (en) 1973-09-05 1974-09-04 Thread cutting device in embroidering machines

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US (1) US3905314A (de)
JP (1) JPS5422150B2 (de)
CH (1) CH577587A5 (de)
DD (1) DD113038A5 (de)
DE (1) DE2344720C3 (de)
IT (1) IT1016867B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080302288A1 (en) * 2005-07-28 2008-12-11 Andreas Ecker Method and Apparatus for Operating a Thread-Producing Machine Having a Thread-Cutting Device

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DE2813392A1 (de) * 1978-03-28 1979-10-04 Freire P Ind Universalfadenabschneider und zusatzvorrichtungen zur anbringung an naehmaschinen
JPS5937005Y2 (ja) * 1981-01-14 1984-10-12 佐脇紙器株式会社 汚物取り器
JPS6344348Y2 (de) * 1981-02-24 1988-11-17
JPS58164293U (ja) * 1982-04-28 1983-11-01 日本石油化学株式会社 集積回路用容器の中仕切板
DE3603146C2 (de) * 1986-02-01 1995-04-27 Marco Trading Gmbh Schneidvorrichtung für Oberfäden von Stickautomaten
DE4202891A1 (de) * 1991-11-08 1993-05-19 Saurer Sticksysteme Ag Fadenklemm- und schneideinrichtung fuer den hinten- oder unterfaden einer stickmaschine
DE9113900U1 (de) * 1991-11-08 1992-12-10 Saurer Sticksysteme Ag, Arbon Fadenklemm- und Schneideeinrichtung für den Hinter- oder Unterfaden einer Stickmaschine
DE4300846A1 (de) * 1993-01-15 1994-07-21 Saurer Sticksysteme Ag Arbon Schneide- und Klemmeinrichtung für Vordergarn für Stickmaschinen
DE59601549D1 (de) * 1995-10-16 1999-05-06 Laesser Franz Ag Stickmaschine, insbesondere Schifflistickmaschine, mit einer Vorderfadenschneid- und -klemmeinrichtung
DE10066310B4 (de) * 1999-12-16 2018-01-04 Juki Corp. Fadenschneider für eine Nähmaschine
DE102011102928A1 (de) * 2011-05-23 2012-11-29 Pfaff Industriesysteme Und Maschinen Ag Nähmaschine mit Fadenklemmme
CN111793913B (zh) * 2020-08-07 2023-07-21 江西禾丰电子机械有限公司 一种剪刀装置
CN112427853B (zh) * 2020-10-14 2022-12-20 东莞市逸丰仪表配件有限公司 一种焊接工艺

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US1080915A (en) * 1912-12-03 1913-12-09 Improved Schiffli Machine Company Thread catching and severing means for shuttle embroidery-machines.
US1080914A (en) * 1912-02-16 1913-12-09 Improved Schiffli Machine Company Thread catching and severing device for embroidery-machines.
US1086470A (en) * 1912-02-02 1914-02-10 Morris Schoenfeld Thread-holding device for embroidering-machines.
US1107711A (en) * 1913-02-18 1914-08-18 Morris Schoenfeld Thread-cutting mechanism for embroidering-machines.
US1390785A (en) * 1915-01-28 1921-09-13 United Shoe Machinery Corp Sewing-machine
US1927950A (en) * 1932-01-06 1933-09-26 Reece Button Hole Machine Co Thread trimmer for buttonhole sewing machines
US1997148A (en) * 1932-09-22 1935-04-09 Brehmer Geb Method of and mechanism for the severance of threads

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DE226828C (de) *
CH50352A (de) * 1909-07-13 1911-06-01 Morris Schoenfeld Einrichtung an Schiffchenstickmaschinen zum Festhalten und Durchschneiden der Sprengfäden beim Übergang von der Herstellung eines Stickereimusters, bezw. Stickereistreifens zur Herstellung eines folgenden Stickereimusters, bezw. Stickereistreifens
DE353627C (de) * 1918-09-08 1922-05-24 Duerkoppwerke Akt Ges Vorrichtung zum selbsttaetigen Klemmen und Abschneiden der zweckmaessig verknuepftenoder nicht verknuepften Faeden fuer Naehmaschinen mit in Zwischenraeumen sich wiederholenden Arbeitsgaengen
DE610483C (de) * 1933-10-01 1935-03-11 Duerkopp Werke A G Fadenabschneidevorrichtung an Naehmaschinen
DE810685C (de) * 1949-02-08 1951-08-13 Singer Mfg Co Nadelfaden-Schneidvorrichtung
DE1942274C3 (de) * 1969-08-20 1973-10-04 Rudolf 5450 Neuwied Reich Stickmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1086470A (en) * 1912-02-02 1914-02-10 Morris Schoenfeld Thread-holding device for embroidering-machines.
US1080914A (en) * 1912-02-16 1913-12-09 Improved Schiffli Machine Company Thread catching and severing device for embroidery-machines.
US1080915A (en) * 1912-12-03 1913-12-09 Improved Schiffli Machine Company Thread catching and severing means for shuttle embroidery-machines.
US1107711A (en) * 1913-02-18 1914-08-18 Morris Schoenfeld Thread-cutting mechanism for embroidering-machines.
US1390785A (en) * 1915-01-28 1921-09-13 United Shoe Machinery Corp Sewing-machine
US1927950A (en) * 1932-01-06 1933-09-26 Reece Button Hole Machine Co Thread trimmer for buttonhole sewing machines
US1997148A (en) * 1932-09-22 1935-04-09 Brehmer Geb Method of and mechanism for the severance of threads

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080302288A1 (en) * 2005-07-28 2008-12-11 Andreas Ecker Method and Apparatus for Operating a Thread-Producing Machine Having a Thread-Cutting Device
US7992505B2 (en) * 2005-07-28 2011-08-09 Andreas Ecker Method and apparatus for operating a thread-producing machine having a thread-cutting device

Also Published As

Publication number Publication date
JPS5422150B2 (de) 1979-08-04
DE2344720A1 (de) 1975-04-03
CH577587A5 (de) 1976-07-15
IT1016867B (it) 1977-06-20
DD113038A5 (de) 1975-05-12
JPS5050148A (de) 1975-05-06
DE2344720B2 (de) 1975-07-03
DE2344720C3 (de) 1981-04-09

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