US3476068A - Sewing hook and bobbin - Google Patents

Sewing hook and bobbin Download PDF

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Publication number
US3476068A
US3476068A US660688A US3476068DA US3476068A US 3476068 A US3476068 A US 3476068A US 660688 A US660688 A US 660688A US 3476068D A US3476068D A US 3476068DA US 3476068 A US3476068 A US 3476068A
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US
United States
Prior art keywords
bobbin
sewing
thread
hook
support
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
US660688A
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English (en)
Inventor
Louis Preston
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.)
Miracle Hook Corp
Original Assignee
Miracle Hook Corp
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 Miracle Hook Corp filed Critical Miracle Hook Corp
Application granted granted Critical
Publication of US3476068A publication Critical patent/US3476068A/en
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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks

Definitions

  • This invention relates generally to an improved sewing hook and a bobbin for sewing machines.
  • the bobbin is mounted in the hook by means of an intermediate bobbin case through which the bobbin thread extends.
  • the opening in the hook is limited by the dimensions of the hook and the bobbin and bobbin case must be designed to be received in the opening in the hook.
  • the size of the bobbin is thus limited by the presence of the bobbin case which must surround the bobbin and be received in the opening in the bobbin hook thereby making the bobbin smaller than would otherwise be desirable since an increase in bobbin size would allow more thread to be wound on the bobbin to permit an increase in the number of stitches that may be sewn before replacement or rewinding of the bobbin is required.
  • tension is applied to the bobbin thread during sewing by applying a frictional pressure to the thread by a suitable device which presses the thread against the outside of the bob'bin case.
  • a suitable device which presses the thread against the outside of the bob'bin case.
  • the tension will vary between various threads based on the parameters of thread diameter and frictional qualities of the thread material.
  • the friction device must be adjusted to obtain the optimum tension on the bobbin thread.
  • the thread fed by the needle is caused to loop around and pass over the sewing hook and, at high speed, the thread sliding across the surface of the hook tends to heat up and could burn if sewing takes place at an excessive rate of speed.
  • the speed of sewing is effectively limited as a result of the possible heating and burning of the thread.
  • an improved sewing hook which eliminates an intermediate bobbin case and thereby allows full use of the opening in the element mounted in the sewing hook for receiving the bobbin.
  • the bobbin can be of a greatly increased size with a resultant substantial increase in thread capacity. Since very large spools can be mounted for carrying the thread advanced by the needle, continuous sewing in commercial operations is constantly interrupted for replace- 3,476,%8 Patented Nov. 4, 1969 pick-up of the bobbin thread before sewing can begin as required with conventional apparatus.
  • the invention also contemplates the application of a frictional drag force directly to the bobbin instead of to the bobbin thread to thereby make the tension independent of thread size and material.
  • the invention further contemplates an improved design of 'the sewing hook to permit the thread to more easily slide thereover during the looping operation which results in a substantial increase in sewing rate without damage tothe thread as a result of burning.
  • Another object of the invention is to provide a sewing hook and bobbin apparatus wherein the bobbin may be directly carried by a bobbin support in the sewing hook without being supported in an intermediate element.
  • Another object of the invention is to provide a sewing hook and bobbin construction wherein the bobbin has a substantially increased capacity as compared with prior art arrangements.
  • Still another object of the invention is to provide a sewing hook and bobbin assembly wherein the tension applied to the bobbin thread is independent of the thread size or material.
  • Another object of the invention is to provide a sewing hook having improved sewing characteristics whereby sewing may take place at a faster rate.
  • FIG. 1 is an elevational view of a sewing hook and 'bobbin constructed in accordance with one embodiment of the instant invention
  • FIG. 2. is a sectional view taken along line 22 of FIG. 1 showing the bobbin assembled to the hook in full lines and withdrawal from the hook in phantom lines;
  • FIG. 3 is a sectional view taken along line 33 of FIG. 1;
  • FIG. 4 is an exploded perspective view of the bobbin and bobbin support shown in the previous figures;
  • FIG. 5 is an elevational view of another embodiment of the instant invention.
  • FIG. 6 is a sectional view taken along line 66 of FIG. 5 with portions thereof being shown in exploded view and by means of phantom lines.
  • a sewing hook indicated generally at 11 is mounted on or includes a shaft 12 by which the sewing hook is rotated.
  • the sewing hook includes a casing 13, which may be of generally standard construction.
  • Casing 13 includes a hook 14 of the known type which picks up the loop of thread 15 from the needle 16 in order to form the stitch in cooperation with bobbin thread 17.
  • Mounted to the outside of casing 13 is a curved plate 18, which may also be of known construction, which also carries a hook 19 proximate to the main hook 14 to define therebetween a slot 21 which receives thread 15 during the looping of the thread over the bobbin thread as shown in FIG. 1.
  • Casing 13 rotates in the direction indicated by arrow A.
  • a bobbin support 22 having cylindrical walls and being closed at one end is provided with an annular projection 23 received in a raceway groove 24 in the cylindrical wall of casing 13 to provide for relative rotation between the bobbin support and casing 13.
  • bobbin support 22 remains stationary and casing 13 rotates about the bobbin support as a result of rotation of shaft 12.
  • a central tube 25 projects upwardly from an end wall of bobbin support 22 and has pivoted thereto a lever 26 which may rotate between the full line position shown in FIG. 2 for applying a frictional drag force to a bobbin, as will be hereafter described, and the phantom line position wherein the bobbin may be inserted in or removed from the opening defined by the cylindrical walls of bobbin support 22.
  • a spring 27 and a plate 28 are mounted within central tube 25 for applying a resilient pressure ot one end of lever 26 to bias the other end toward the bobbin.
  • the bobbin is indicated at 31 and is similar to known bobbins except that it is of substantially larger size than previous bobbins capable of being mounted in a sewing hook of equal size.
  • Bobbin 31 has a central opening 32 through which the bobbin is rotatably mounted on tube 25.
  • the bobbin is symmetrical and has end walls 33, one of which engages the bottom wall of bobbin support 22. The other end wall is engaged by an adjusting screw 34 to apply a frictional drag to the bobbin by the contact pressure between screw 34 and end wall 33 as a result of the pressure applied to lever 26 to resiliently maintain it in the full line position shown in FIG. 2 by spring 27.
  • casing 13 and bobbin support 22 are elements found in existing sewing hooks with the opening defined by the cylindrical walls of the bobbin support defining the limit of size of elements that may be mounted therein.
  • a bobbin as well as a bobbin casing must be received in said opening thereby reducing the permissible diameter and width of the bobbin.
  • elimination of the bobbin case by directly mounting the bobbin within the bobbin support permits the bobbin to have a greater diameter and width and thus a substantially greater capacity. Thus the bobbin will require rewinding or replacement at longer intervals to increase the efliciency of the sewing operation.
  • the outer peripheral edge of bobbin support 22 is provided with a radially directed groove 35 through which the bobbin thread extends and by which the bobbin support is guided for proper orientation within the sewing machine. It is again noted that the bobbin support remains stationary during the sewing operation.
  • bobbin support 22 is provided with a radially directed aperture 36 through which needle 16 may project at the end of its downward travel during formation of the loop which will be picked up by hook 14.
  • the provision of a groove 35 and an aperture 36 in the bobbin support is likewise known in the art.
  • the configuration of the peripheral edge of bobbin support 22 is a substantial departure from prior arrangements and a substantial improvement thereover whereby the machine can be operated at a greatly increased speed.
  • book 14 draws thread through needle 16 as it rotates and forms a large loop which is passed around bobbin thread '17 in order to form the stitch which is drawn tight when the needle reciprocates to its raised position.
  • development of the loop of thread 15 requires that it slide over the bobbin support and bobbin and development of the surface of the peripheral edge of the bobbin support, at least during the formation of the loop by the rotating hook will greatly improve the operating characteristics.
  • the developed surface is indicated at 41 and is perhaps best seen in the perspective view of FIG. 4.
  • the leading or outermost edge of developed surface 41 extends outwardly a sufficient distance to cause the thead to clear over the outer end wall of bobbin 31.
  • the critical area of the developed surface extends from groove 35 for about in the advancing direction of hook 14 or in other words during the portion of hook travel during which the loop of thread 15 is being increased in size and thus must slide over developed surface 41.
  • the remaining configuration of developed surface 41 is less critical since, after hook 14 has traveled 180, the loop of thread will fall free and be drawn back by return movement of the needle.
  • a phantom line has been drawn perpendicular to the central axis of bobbin support 22 in FIG. 4.
  • the critical development of surface 41 is the surface area generally to the left of the phantom line while the area generally to the right of the phantom line is not deemed critical.
  • Developed surface 41 in the critical area, slopes off sharply from its projecting edge 42 to a line 43 at or below the level of hook 14, as may be seen in FIG. 2.
  • the major portion of the critical surface may slope along a straight line or be slightly convex except at the initial portion of formation of the loop where the surface is preferably slightly concave as indicated at 44 in FIG. 4.
  • Developed surface 41 for a substantial portion of the area to the left of the phantom line in FIG. 4 slopes at an acute angle which is preferably less than 45 with respect to the cylindrical wall defining the opening in the bobbin support.
  • FIGS. 5 and 6 an alternate embodiment for applying a friction drag force to the bobbin is disclosed with means also being provided for ejecting the bobbin from the bobbin support.
  • the construction of the various elements is generally the same as described in connection with P168. 1 through 4 and the description of the embodiment of FIGS. 5 and 6 will be limited to the differences in construction. As between the two embodiments, like numerals refer to like parts.
  • a central post 51 replaces central tube 25.
  • the central post is provided with a longitudinal hole 52 having threads 53 proximate to the outer end thereof and a cam surface 54 at the base thereof.
  • the cam surface slopes toward a slotted aperture 55 in the wall of the central post.
  • a pin 56 having a cam shaped projection 57 at one end thereof is slidably received in longitudinal hole 52 with the cam shaped projection extending through slotted aperture 55.
  • the opposite end of pin 56 carries a post 58 over which is mounted a spring 59. One end of the spring bears against the end shoulder of pin 56 and the other end is received in a screw 61 thread into the central post.
  • spring 59 biases pin 56 toward the bottom of hole 52 and, by cooperation with cam surface 54, cam shaped projection 57 is caused to be biased to extend outwardly through slotted aperture 55.
  • Bobbin 31 is the assembled position as shown in FIG. 6, is received over central post 51 and the wall of the central opening 32 in the bobbin is engaged by projection 57 to urge the projection and the pin carrying same into hole 52.
  • a frictional drag force is applied to the bobbin to thereby impart tension to the bobbin thread as it is unreeled from the bobbin during the sewing operation.
  • the friction force applied to the bobbin can be selectively increased or decreased.
  • the tension applied to the Bobbin 31 in the assembled position as shown in FIG. bobbin thread is a function of the drag force placed on the bobbin and is independent of bobbin thread diameter or material.
  • a bobbin ejecting device can be mounted to bobbin support 22 for partial ejection of the bobbin so that it may be grasped and withdrawn.
  • the bobbin ejecting device is composed of a lever 63 pivoted intermediate its ends as at 64 to the bobbin support and an ejecting arm 65 is pivoted at one end, as at 66, to one end of lever 63.
  • the other end of arm 65 projects proximate to the interior surface of one of the end walls 33 of the bobbin and, on rotation of lever 63 to the phantom line position shown in FIG. 6, the bobbin can be driven outwardly so that it may be physically grasped.
  • a spring 67 surrounding pivot 66 acts between the lever and ejecting arm to bias the bobbin ejecting device to the full line position shown in FIG. 6.
  • a sewing hook and bobbin for a sewing machine comprising a casing, a bobbin support, mounting means cooperating between said casing and said bobbin support for rotatably mounting said bobbin support in said casing, said bobbin support having an opening therein, a bobbin rotatably mounted in said opening in said bobbin support, and friction means carried by said bobbin support and acting between said bobbin support and said bobbin for applying a frictional drag force to said bobbin, said friction means including means for adjusting the frictional drag force applied to said bobbin, said bobbin occupying substantially the entire volume of said opening in said bobbin support, said bobbin support including a central post over which said bobbin is rotatably mounted and said friction means being carried by said central post and having a portion thereof adapted to engage a surface of said bobbin, said central post having an aperture therein and said friction means including a lever pivoted to said central post and having an end thereof projecting into said aperture in said central post,
  • a sewing hook and bobbin for a sewing machine comprising a casing, a bobbin support, mounting means cooperating between said casing and said bobbin support for rotatably mounting said bobbin support in said casing, said bobbin support having an opening therein, a bobbin rotatably mounted in said opening in said bobbin support, and friction means carried by said bobbin support and acting between said bobbin support and said bobbin for applying a frictional drag force to said bobbin, said friction means including means for adjusting the frictional drag force applied to said bobbin, said bobbin occupying substantially the entire volume of said opening in said bobbin support, said bobbin support including a central post over which said bobbin is rotatably mounted and said friction means being carried by said central post and having a portion thereof adapted to engage a surface of said bobbin, said central post having an aperture therein and said friction means including a pin slideably received in said aperture in said central post, said aperture having a cam surface at the base thereof

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US660688A 1967-08-15 1967-08-15 Sewing hook and bobbin Expired - Lifetime US3476068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66068867A 1967-08-15 1967-08-15

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US3476068A true US3476068A (en) 1969-11-04

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US660688A Expired - Lifetime US3476068A (en) 1967-08-15 1967-08-15 Sewing hook and bobbin

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US (1) US3476068A (de)
CH (1) CH469848A (de)
DE (1) DE1785130C3 (de)
FR (1) FR1578415A (de)
GB (1) GB1200967A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009670A (en) * 1975-11-24 1977-03-01 Beatty Thomas Mitchell Rotary hook sewing machine
US4100866A (en) * 1977-03-31 1978-07-18 Jonathan Temple Incorporated Core construction for a sewing machine bobbin
DE2937116A1 (de) * 1978-09-25 1980-04-03 Necchi Spa Umlaufender greifer fuer naehmaschinen
WO1981000120A1 (en) * 1979-07-02 1981-01-22 W Starr Rotary hook for sewing machine
US4284017A (en) * 1978-07-13 1981-08-18 Starr Wayne E Rotary hook for sewing machine
DE19510830C2 (de) * 1995-03-24 2001-11-22 Duerkopp Adler Ag Spulenbremse für die Greiferfaden-Spule einer Doppelsteppstich-Nähmaschine
USD739717S1 (en) 2014-06-05 2015-09-29 Walter Edward Brown Wire spool guide
USD739718S1 (en) 2015-02-18 2015-09-29 Walter Edward Brown Wire spool guide
USD739719S1 (en) 2015-02-18 2015-09-29 Walter Edward Brown Wire spool guide
USD740644S1 (en) 2014-06-05 2015-10-13 Walter Edward Brown Wire spool guide
USD741154S1 (en) 2015-02-18 2015-10-20 Walter Edward Brown Wire spool guide

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353335C3 (de) * 1972-10-24 1981-06-19 Manta N.V., Waasmunster Rundgreifer für Nähmaschinen
DE102008030002A1 (de) * 2008-06-24 2009-12-31 Dürkopp Adler AG Greifer für eine Doppel-Steppstich-Nähmaschine
CH700442A1 (de) * 2009-02-17 2010-08-31 Bernina Int Ag Verriegelungsvorrichtung für eine Spulenkapsel für eine Unterfadenspule.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US573894A (en) * 1896-12-29 Bobbin case and holder for revolving-hook sewing-machines
US875603A (en) * 1901-12-11 1907-12-31 William N Parkes Automatic bobbin-controller for sewing-machines.
US1096369A (en) * 1913-03-20 1914-05-12 Richard K Hohmann High-speed revolving-hook sewing-machine.
US1105197A (en) * 1913-05-05 1914-07-28 Nat Sewing Machine Co Bobbin-holder for rotary-hook machines.
US1182842A (en) * 1914-07-20 1916-05-09 Victor Shoe Machinery Co Shuttle-mounting for sewing-machines.
US1351869A (en) * 1918-04-24 1920-09-07 Singer Mfg Co Sewing-machine loop-taker
US1702383A (en) * 1924-03-26 1929-02-19 Singer Mfg Co Sewing-machine bobbin-case latch
US2555658A (en) * 1949-01-29 1951-06-05 Singer Mfg Co Bobbin rotation restraining means for sewing machines
US3050021A (en) * 1960-02-01 1962-08-21 Tohoku Kosakusho Kk Lower thread adjusting apparatus in sewing machines

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US573894A (en) * 1896-12-29 Bobbin case and holder for revolving-hook sewing-machines
US875603A (en) * 1901-12-11 1907-12-31 William N Parkes Automatic bobbin-controller for sewing-machines.
US1096369A (en) * 1913-03-20 1914-05-12 Richard K Hohmann High-speed revolving-hook sewing-machine.
US1105197A (en) * 1913-05-05 1914-07-28 Nat Sewing Machine Co Bobbin-holder for rotary-hook machines.
US1182842A (en) * 1914-07-20 1916-05-09 Victor Shoe Machinery Co Shuttle-mounting for sewing-machines.
US1351869A (en) * 1918-04-24 1920-09-07 Singer Mfg Co Sewing-machine loop-taker
US1702383A (en) * 1924-03-26 1929-02-19 Singer Mfg Co Sewing-machine bobbin-case latch
US2555658A (en) * 1949-01-29 1951-06-05 Singer Mfg Co Bobbin rotation restraining means for sewing machines
US3050021A (en) * 1960-02-01 1962-08-21 Tohoku Kosakusho Kk Lower thread adjusting apparatus in sewing machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009670A (en) * 1975-11-24 1977-03-01 Beatty Thomas Mitchell Rotary hook sewing machine
US4100866A (en) * 1977-03-31 1978-07-18 Jonathan Temple Incorporated Core construction for a sewing machine bobbin
US4284017A (en) * 1978-07-13 1981-08-18 Starr Wayne E Rotary hook for sewing machine
DE2937116A1 (de) * 1978-09-25 1980-04-03 Necchi Spa Umlaufender greifer fuer naehmaschinen
US4303029A (en) * 1978-09-25 1981-12-01 Necchi Societa Per Azioni Rotary hook for sewing machine
WO1981000120A1 (en) * 1979-07-02 1981-01-22 W Starr Rotary hook for sewing machine
DE19510830C2 (de) * 1995-03-24 2001-11-22 Duerkopp Adler Ag Spulenbremse für die Greiferfaden-Spule einer Doppelsteppstich-Nähmaschine
USD739717S1 (en) 2014-06-05 2015-09-29 Walter Edward Brown Wire spool guide
USD740644S1 (en) 2014-06-05 2015-10-13 Walter Edward Brown Wire spool guide
USD739718S1 (en) 2015-02-18 2015-09-29 Walter Edward Brown Wire spool guide
USD739719S1 (en) 2015-02-18 2015-09-29 Walter Edward Brown Wire spool guide
USD741154S1 (en) 2015-02-18 2015-10-20 Walter Edward Brown Wire spool guide

Also Published As

Publication number Publication date
DE1785130A1 (de) 1972-01-05
FR1578415A (de) 1969-08-14
DE1785130B2 (de) 1973-11-15
CH469848A (de) 1969-03-15
DE1785130C3 (de) 1974-06-12
GB1200967A (en) 1970-08-05

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