US3847101A - Sewing machine having thread severing device - Google Patents

Sewing machine having thread severing device Download PDF

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Publication number
US3847101A
US3847101A US00426605A US42660573A US3847101A US 3847101 A US3847101 A US 3847101A US 00426605 A US00426605 A US 00426605A US 42660573 A US42660573 A US 42660573A US 3847101 A US3847101 A US 3847101A
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United States
Prior art keywords
bracket
clamping arm
cutter
movement
sewing machine
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Expired - Lifetime
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US00426605A
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English (en)
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G Tolle
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Individual
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Individual
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Publication date
Priority claimed from DE19732300042 external-priority patent/DE2300042C3/de
Application filed by Individual filed Critical Individual
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Publication of US3847101A publication Critical patent/US3847101A/en
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Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/02—Upper casings
    • 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
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/06—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for sewing buttonholes

Definitions

  • the machine includes a rotatable shuttle mounted on the bracket in a position overlying [22] Filed:
  • a [211 App]' NO"426605 clamping arm is pivoted on the frame below the v bracket and includes a portion which is engageable Foreign Application Priority Data with a cutting mechanism carried on a pressure plate which is supported on the bracket. Movement of the Jan. 1973 Germany............................ 2300042 bracket causes movement of the clamping arm to ac tuate the cutting mechanism to sever the thread.
  • ABSTRACT v A sewing machine comprises a machine frame having 6 Claims, 6 Drawing Figures mrllllL SHEET 1 BF 2 PATENTEDHUV 12 19M Fig.7
  • This invention relates in general to the construction of sewing machines and, in particular, to a new and useful sewing machine which includes a rotatable shuttle mounted on a bracket which is pivotally mounted on a frame carrying the needle which reciprocates upwardly and downwardly in the frame from below the workpiece support in cooperation with the shuttle and which includes means for severing the thread when the sewing machine is stopped and the arm is moved to a nonoperative or rest position.
  • the present invention relates to sewing machines of a type having a rotating shuttle provided above the table for the sewn material and received in a bracket which is movable from a working position into a rest position; a needle cooperating with the shuttle, and adapted to pass through the sewn material from beneath upwardly, and a material clamping arm movable from a clamping position into a rest position.
  • the invention provides a thread cutting mechanism for sewing machines of the mentioned type, which comes automaticallyinto effect at the end of the sewing operation while the bracket is moving from its working into its rest position, assuring a very short end portion of the thread remaining with the sewn material and avoiding the necessity of using both a special thread puller and a particular drive and control means for the cutting tool.
  • the sewing machine includes a drive connection operating with an idle stroke and interconnecting the bracket receiving the shuttle with the clamping arm for the sewn material and a drive mechanism for a cutting tool which, in a well-known manner, is carried on the clamping arm and actuated by the motion of the bracket.
  • the idle stroke of the drive connection between the bracket and the clamping arm has the effect that at the end of the sewing operation, the bracket is first lifted from the material and the clamping arm up to a certain distance, while the clamping arm remains applied against the material, whereby the thread is pulled off the shuttle in a length corresponding to the length of the idle stroke.
  • both the beginning and the execution of the cutting operation proper is automatically derived from the necessary movement of the bracket and the thread is cut off close to the surface of the material.
  • Still another advantage results therefrom, namely, that both the pulling off and the cutting of the thread is effected during the motion of the bracket from its working into its rest position so that the operational cycle of the sewing machine can be considerably reduced.
  • an object of the invention to provide an improved sewing machine of a type which includes a bracket or arm which is mounted on a machine frame for pivotal movement upwardly to a rest position and downwardly into pressing engagement with the material on a support of the frame and which includes a rotatable shuttle mounted over a reciprocating needle which is carried in theframe below the workpiece support and which includes a clamping arm which engages the workpiece and which is moved by movement of the bracket to actuate a cutting mechanism to cut away the thread when the bracket is moved to a rest position.
  • a further object of the invention is to provide a sew ing machine which includes a rotatable bobbin mounted above the reciprocating needle of a sewing machine frame and which includes a clamping arm arranged belowa movable bracket carrying the bobbin which holds the workpiece as the thread is drawn upwardly therethrough during the time in which the bracket is moved to a rest position and thereafter actuates a cutting mechanism to cut the thread close to the material and to leave a length of thread remaining in the bobbin for the formation of a new loop when the machine is again operated.
  • a further object of the invention is to provide a sewing machine construction which is simple in design, rugged in construction, and economical to manufacture.
  • FIG. 1 is a side elevational view of a stitch-group sewing machine constructed in accordance with the invention
  • FIG. 2 is a partial elevational view of the mechanism shown in FIG. 1 with the bracket in a lifted position;
  • FIG. 3 is a view similar to FIG. 2 with the bracket in a complete rest position
  • FIG. 4 is a section taken along the line IVIV of 5 GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENT
  • a sewing machine which for example, may be a stitch-group buttonhole sewing machine, comprising a stationary substructure or frame 1, with a bracket or arm 2 pivotally mounted thereon at the location of a pivot pin 3.
  • a double-action electromagnet 4 is provided in the substructure 1, whose armature is connected to a portion of the bracket 2 lateral to the pivot 3. Both the working and the rest position is fixed by corresponding nonrepresented stops.
  • a main shaft 5 is mounted in the substructure l of the sewing machine, and carries a pulley 6, driven by a stop motor (not shown).
  • shuttle 12 is driven at a double speed with respect to the reciprocating motion of the needle.
  • the sewing machine is provided with a support 21 for the material to be sewn.
  • the support 21 is pivotally mounted at 22 and backed up, in the stitching area, by a slidable rest 23, both the pivot 22 and the rest 23 being supported by the substructure 1.
  • the rest 23 comprises a bolt 24 which is biased by an adjustable spring 25 and movable within a distance predetermined by astop 26.
  • On the support 21 is a plate 28 provided, which is shiftable in the direction of the longitudinal axis of the machine by means of a worm gear 29 and in a manner not specifically shown.
  • the material to be sewn is placed on surface 27 of plate 28.
  • the worm gear 29 is driven by a toothed belt 32 carries a rail 42, as particularly seen in FIG. 4, which extends in the advance direction of the clamping arm.
  • a pressure roller 43 mounted for free rotation in a a carrier 44 is adapted to ride on rail 42.
  • Carrier 44 is rigidly connected to rod 45 which is slidably received in guide hole 47 of lug 46 provided on bracket 2.
  • Spring 48 is mounted between the lug 46 and carrier 44 urging thepressure roller 43'per'manently downwards, the traveling distance of the carrier 44 being limited by a pin 50 projecting from sliding rod 45 and guided in an oblong slot 49 of lug 46.
  • Carrier 44 is further provided with a claw 51 engaging the pressure piece or the rail from beneath and with an angle stop for engaging bracket 2.
  • the cutting mechanism or the thread comprises a swinging member 54 (see FIGS. 4, 5 and 6), pivoted on a pin 53 which is provided on the tenter 40.
  • the free end of the swing member 54 is formed with a cutting blade 55.
  • Counterblade 56 cooperating therewith is a piece which is pivotally mounted on a pin 57 provided on swinging member 54 and which is formed with two toes 58, 59 cooperating with a stop piece 60 secured to tenter 40, in a manner described hereinafter.
  • a flat spring 62 applying against the Counterblade 56 is secured to a pin 61 provided on the swinging member 54.
  • connection lever 63 whose other end is hinged to crank 64 (FIGS. 1 to 3) which is pivotally mounted on pin 65 provided on the clamping arm 38 and retained in its initial position by worm spring 66.
  • crank 64, connection lever 63, swinging member 54 and the two pins 53 and 65 form a four-bar linkage.
  • crank 64 is'formed with a nose 67, and serves simultaneously as a pawl for ratchet lever 68 which is pivotally mounted on pin 69 provided on bridge 70.
  • Ratchet lever 68 is held in the position shown in FIG. 1 by means of a worm spring 71 and is formed with an arm 72 adapted to apply against stop pin 73 which is provided on bridge for limiting the pivotal motion of ratchet lever 68.
  • Bridge-70 which has an angular cross-section, is mounted tiltable about pin 74 provided on bracket 2, and can be adjusted in a desired position by means of two set screws 75, 75 which are received in support 76 secured to bracket 2 and apply against the upper surface of bridge 70, the position of the latter being given by the length of engagement of the screws.
  • the sewing machine operates as follows:
  • bracket 2 is fixed in its working position (FIG. 1); the sewn material is placed between the surface 27 and the tenter 40 of clamping arm 38.
  • spring 25 provided in substructure 1, support 21, and thereby surface plate 27 of plate 28, is pressed against tenter 40.
  • the machine is stopped in the lowermost position of needle l0'and the electromagnet 4 is energized.
  • the needle thread extends between the bottom side of the sewn material and the needle and the shuttle thread extends between the upper side of the sewn material and the shuttle or the shuttle bobbin.
  • bracket 2 begins to execute its motion about pivot 3, from the working into the rest position,
  • bracket 2 begins to move away from the surface 27 while continuing its pivotal movement about pivot 3. At this moment,
  • bracket 2 During the following continuing pivotal movement of bracket 2, the clamping arm 38 is taken along upwards by claw 51 engaging from beneath rail 42; thus, the arm 38 turns about pivot 37. Thereby, ratchet lever 68 and pawl 67 are disengaged, and arm 72 of lever 68 abuts against pin 73 (FIG. 3). As soon as crank 64 and lever 68 are disengaged, the worm spring 66 is released and returns the four-bar linkage formed by crank 64, the connection lever 63 and swinging member 54 into the initial position.
  • Toe 59 of counterblade 56 applies against stop piece 60 fixed to tenter so that counterblade 56 is pivoted about pin 57 in the counterclockwise direction and swing member 54, under the action of worm spring 66, is pivoted about pin 53 and returns into its initial position.
  • bracket 2 To bring the bracket 2 from its rest position back into its working position, the electromagnet is energized again. Bracket 2 takes clamping arm 38 along in the downward direction until tenter 40 comes to rest upon the sewn material. Since the characteristic of spring 48 is flatter than that of spring 25, during the continuing downward movement of bracket 2, spring 48 is compressed first and angle stop 52 applies against the bottom surface of bracket 2. Pressure roller 43, resting upon rail 42, presses tenter 40 against, surface 27 of plate 28, and support 21 is thereby urged to pivot about 22 and overcome the force of spring 25. The downward movement of bracket 2 continues until it reaches and is fixed in its working position predetermined by a stop.
  • a sewing machine comprising a machine frame having a workpiece support, a bracket mounted on said frame for pivotal movement upwardly to a rest position and downwardly to an operative position, a needle mounted on said frame for upward and downward reciprocation below said support, a rotatable shuttle mounted on said bracket overlying said needle for cooperative engagement therewith, a clamping arm connected to said bracket for movement therewith and pivoted on said frame over said support and having an end adapted to clamp the workpiece on the support, a thread cutter carried by said bracket and connected to said clamping arm, said clamping arm being movable by upward movement of said bracket to actuate said cutter to sever the thread.
  • said cutter comprises a cutter lever mechanism, a pressure plate supported on said racket, said lever mechanism being pivoted on said pressure plate and being connected to said clamping arm and being pivotal thereby to effect the cutting operation.
  • a sewing machine including a press plate, a vertically movable member carrying said press plate and having a pin portion, a guide carried on said bracket in which said member is movable upwardly and downwardly and including a slot in which said pin portion is engageable and confined for movement within defined limits of said slot, and spring means urging said pressure plate downwardly away from said bracket, said pressure plate being engageable with the workpiece and carrying said cutter.
  • connection between said clamping arm and said bracket includes a crank pivotally mounted on said clamping arm and having an end pivotally connected to an actuating member connected to said cutter, said crank having a pawl engagement surface, and a ratchet lever pivoted on said bracket and engageable with said pawl to rotate said crank to move said actuating member to actuate said cutter when said bracket is moved upwardly by a predetermined amount.
  • a sewing machine wherein said cutter is connected by four-bar linkage comprising said actuating member, said crank with said pawl, and said cutter, said cutter including a pivotal lever portion included in said four-bar linkage.
  • a sewing machine inc'ludin a bridge pivotally mounted on said bracket, saidratchet lever being pivoted on said bridge and adjustment means connected to said bridge for adjusting in the position thereof.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00426605A 1973-01-02 1973-12-20 Sewing machine having thread severing device Expired - Lifetime US3847101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732300042 DE2300042C3 (de) 1973-01-02 Nähmaschine mit Fadenschneideinrichtung

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US3847101A true US3847101A (en) 1974-11-12

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US00426605A Expired - Lifetime US3847101A (en) 1973-01-02 1973-12-20 Sewing machine having thread severing device

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JP (1) JPS5443936B2 (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962979A (en) * 1975-01-14 1976-06-15 Yazaki Yoshiharu Sewing machine
US4134346A (en) * 1976-10-30 1979-01-16 Firma Pfaff Industriemaschinen Gmbh Buttonhole sewing machine
US4616582A (en) * 1984-03-17 1986-10-14 Pfaff Industriemaschinen Gmbh Work clamp for buttonhole sewing machines
US4691651A (en) * 1985-05-23 1987-09-08 Kochs Adler Ag Tiltable sewing head and underarm for a sewing machine used in conjunction with a workpiece supporting carrier plate
US4919061A (en) * 1988-04-12 1990-04-24 Durkoppwerke Gmbh Button-hole sewing machine having a thread cutting and clamping device
US5619941A (en) * 1996-02-21 1997-04-15 Amf Reece, Inc. Clamp for a buttonhole sewing machine
US5848573A (en) * 1995-07-24 1998-12-15 Juki Corporation Button hole sewing machine
CN107217396A (zh) * 2017-05-18 2017-09-29 杰克缝纫机股份有限公司 一种缝纫机压杆机构及缝纫机
CN107237063A (zh) * 2017-08-11 2017-10-10 杰克缝纫机股份有限公司 一种缝纫机的剪线装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499335A (en) * 1946-04-25 1950-02-28 Singer Mfg Co Thread-trimming and pull-off mechanism for sewing machines
US2509619A (en) * 1948-06-25 1950-05-30 Singer Mfg Co Article attaching machine
US3512491A (en) * 1967-09-27 1970-05-19 Kochs Adler Ag Thread cutting mechanism for lockstitch sewing machines
US3749041A (en) * 1971-12-01 1973-07-31 Union Special Machine Co Thread cutting and wiping mechanism for group stitch sewing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499335A (en) * 1946-04-25 1950-02-28 Singer Mfg Co Thread-trimming and pull-off mechanism for sewing machines
US2509619A (en) * 1948-06-25 1950-05-30 Singer Mfg Co Article attaching machine
US3512491A (en) * 1967-09-27 1970-05-19 Kochs Adler Ag Thread cutting mechanism for lockstitch sewing machines
US3749041A (en) * 1971-12-01 1973-07-31 Union Special Machine Co Thread cutting and wiping mechanism for group stitch sewing machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962979A (en) * 1975-01-14 1976-06-15 Yazaki Yoshiharu Sewing machine
US4134346A (en) * 1976-10-30 1979-01-16 Firma Pfaff Industriemaschinen Gmbh Buttonhole sewing machine
US4616582A (en) * 1984-03-17 1986-10-14 Pfaff Industriemaschinen Gmbh Work clamp for buttonhole sewing machines
US4691651A (en) * 1985-05-23 1987-09-08 Kochs Adler Ag Tiltable sewing head and underarm for a sewing machine used in conjunction with a workpiece supporting carrier plate
US4919061A (en) * 1988-04-12 1990-04-24 Durkoppwerke Gmbh Button-hole sewing machine having a thread cutting and clamping device
US5848573A (en) * 1995-07-24 1998-12-15 Juki Corporation Button hole sewing machine
US5619941A (en) * 1996-02-21 1997-04-15 Amf Reece, Inc. Clamp for a buttonhole sewing machine
CN107217396A (zh) * 2017-05-18 2017-09-29 杰克缝纫机股份有限公司 一种缝纫机压杆机构及缝纫机
CN107217396B (zh) * 2017-05-18 2020-04-14 杰克缝纫机股份有限公司 一种包缝机压杆机构及包缝机
CN107237063A (zh) * 2017-08-11 2017-10-10 杰克缝纫机股份有限公司 一种缝纫机的剪线装置
CN107237063B (zh) * 2017-08-11 2020-01-31 杰克缝纫机股份有限公司 一种缝纫机的剪线装置

Also Published As

Publication number Publication date
DE2300042B2 (de) 1977-06-08
DE2300042A1 (de) 1974-08-08
JPS5443936B2 (enrdf_load_stackoverflow) 1979-12-22
JPS49101154A (enrdf_load_stackoverflow) 1974-09-25

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