[go: up one dir, main page]

US3041008A - Thread tension device for sewing machines - Google Patents

Thread tension device for sewing machines Download PDF

Info

Publication number
US3041008A
US3041008A US782493A US78249358A US3041008A US 3041008 A US3041008 A US 3041008A US 782493 A US782493 A US 782493A US 78249358 A US78249358 A US 78249358A US 3041008 A US3041008 A US 3041008A
Authority
US
United States
Prior art keywords
thread
disk
wheel
stud
tension
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
US782493A
Other languages
English (en)
Inventor
George A Oehlschlager
Jr Arthur S Meloy
William C Van Ness
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Priority to US782493A priority Critical patent/US3041008A/en
Priority to FR813698A priority patent/FR1243271A/fr
Priority to ES0254355A priority patent/ES254355A1/es
Priority to GB43568/59A priority patent/GB867694A/en
Priority to CH8215459A priority patent/CH389373A/de
Application granted granted Critical
Publication of US3041008A publication Critical patent/US3041008A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the main object of the invention is to provide a sewing machine thread tensioning device which when once adjusted to impart the proper frictional resistance to one given sewing thread, will impart without adjustment substantially the same frictional resistance to various sewing threads having widely different characteristics.
  • Another object of this invention is to provide a rotary thread tensioning wheel having spokes offset alternately in opposite directions to define two sets of spokes each set formed with a solid peripheral rim for easy threading without the use of a thread guard.
  • Still another object of this invention is to provide a composite thread tensioning whee-l construction in which the parts may be made separately, assembled, and secured together quickly and easily.
  • FIG. 1 represents a longitudinal cross-sectional view of a sewing machine thread tensioning device in accordance with this invention
  • FIG. 2 represents an elevational view of the thread tensioning wheel as viewed from the right hand side in PEG.
  • FIG. 3 is an enlarged cross-sectional view of the assembled thread tensioning wheel illustrated in FIG. 1,
  • FIG. 4 is an enlarged cross-sectional view of a portion of the thread engaging disks prior to being welded together
  • FIG. 5 is an enlarged cross-sectional view of the periphery of the thread tensioning wheel taken substantially along line 5-5 of FIG. 2 and illustrating the thread thereon.
  • 11 represents an adapter formed internally with a bore 12 and a counterbore 13. Externally of the counterbore, the adapter is formed with a transverse segmental slot 14 opening onto the counterbore and with an annular groove 15. The adapter is intended to be accommodated in an aperture in a sewing machine frame, the annular groove 15 serving as a set for the end of a set screw threaded in the sewing machine frame for locking the adapter thereon. Externally of the bore 12, the adapter is of reduced diameter and is drilled and tapped radially for a set screw 16, the reduced diameter providing clearance for the head of the set screw when the adapter is applied to a sewing machine.
  • the base portion 17 of a stud 18 Seated in the bore 12 of the adapter and secured in place by the set screw 16 is the base portion 17 of a stud 18.
  • the free extremity of the stud is formed with a longitudinal slot 19 and with external threads 29.
  • the stud is formed with a portion 21 of larger diameter, which portion is grooved lengthwise as at 22 to provide a seat for one extremity of a check spring 23 which is confined in the space between the stud and the counterbore 12.
  • the check spring includes a radial arm 24 extending outwardly through the segmental slot 14 in the adapter and formed with a thread engaging hook 25.
  • a cupped disk 26 formed with peripheral notches 27.
  • a pressure plate 23 having a diameter bar 29 which extends through the longitudinal slot 19 in the stud to prevent rotation of the pressure plate relatively to the stud.
  • the pressure plate is formed with a plurality of raised spurs 30 on the side nearest the disk 26, the spurs preferably being formed by upsetting the material of the pressure plate from the opposite side, as with a punch or the like.
  • the pressure plate 28 is urged toward the disk 26 by a beehive spring 31 constrained on the stud 18 by a knurled nut 32 engaging the threads 20.
  • a thread tensioning wheel is rotatably arranged on the stud between the disk 26 and the pressure plate 23 with pads of frictioning material 41 arranged one at each side of the tensioning wheel.
  • the pads 41 are preferably made of felt but may be made of leather, plastic, cork, fiber, etc. Under the pressure exerted by the beehive spring 31, the frictioning pads 41 will deform to envelop the peripheral notches 27 of the disk 26 and the raised spurs 30 of the pressure plate 28, thus effectively locking the pads 41 against rotation relatively to the stud 18. Frictional resistance to turning movement of the thread tensioning wheel will, therefore, depend solely upon the frictional forces developed between the frictioning pads 41 and the thread engaging wheel.
  • the thread tensioning Wheel 40 is a composite of two disks 50 and 51 preferably projection welded together to provide an integral wheel.
  • the disk 50 adjacent its transverse axis is offset to one side of the planes containing the disk and has struck out from the offset portion a hub flange 52 extending perpendicularly across the planes containing the disk 50 to provide a snug but free fit on the stud 18.
  • the width of the hub flange 52 minimizes canting of the tensioning wheel on the stud and thus prevents the wheel from binding on the stud.
  • Struck into the disk 50 from one side is an annular groove 53 which produces at the opposite side of the disk, an annular raised rib or projection 54. As illustrated in FIG.
  • the projection 54 will have fused with the disk 51 and the disks, being clamped together during the welding process, will be joined in abutting relation.
  • the disk 51 is preferably formed with a large central aperture 56 extending immediately adjacent the projection '3 54 of the disk t ⁇ , thus reducing the mass of the thread tensioning wheel and providing a low moment of inertia.
  • each of the disks 5% and 51 is identical, that is, that portion of the disk 5t) outwardly of the raised rib 54 has the same form as does the disk 51.
  • the same reference characters will be applied to the outer ortions of each disk and those portions of the outer periphery of disk 51 will be indicated on the drawings with prime numbers.
  • Each of the disks 50 and 51 is formed with a continuous outer peripheral rim flared outwardly as at 57, 57'. Inwardly of the peripheral rims, each disk is formed with an annular series of substantially trapezoidal shaped openings 58, 58', defining between adjacent openings, radial fingers 59, 59.
  • each of the radial fingers 59, 59 is inclined to one side of the disk on which it is formed to provide an offset 60, 61) of from /2 to 1 times the thickness of the disks 50, 51.
  • the outer portion of each of the fingers 59, 59' is inclined outwardly in the opposite direction such that the outer portion of the fingers traverses the plane of the disk at an angle of from 20 with respect to the plane of the disk as indicated at A in FIG. 3.
  • the disks 50 and 51 are assembled and secured permanently together with the radial fingers 59 of disk 50 offset in a direction opposite that of the fingers 59 of disk 51, as illustrated in FIG. 3. As shown in FIG. 2 the radial fingers of one disk are disposed opposite the openings in the other disk. Furthermore, the openings 58, 58' are preferably made approximately three times as wide as the radial fingers such that when the disks are assembled, the space between adjacent radial fingers 59, 59 is approximately equal to the width of one of the radial fingers.
  • each radial finger 59, 59' be parallel.
  • guard members are not required for the thread tensioning wheel since the continuous peripheral I hook of the check spring.
  • the thread will take a sinuous path weaving alternately around the radial fingers 59, 59 as illustrated in FIG. 5 so that the resistance to slippage of the thread with respect to the wheel 40 will be considerable, that is, the resistance to slippage will be far greater than the maximum possible tension that the thread can sustain.
  • the tension or frictional resistance to movement of the thread will thus depend solely upon the frictional resistance to turning of the wheel 40 offered by the pads 41.
  • the stud 18 is preferably formed with an axial bore 61 in which is accommodated a tension release pin 62 which abuts the diameter bar 29 of the pressure plate and protrudes beyond the base portion 17 of the stud 18 for operative engagement with any conventional tension releasing linkage of a sewing machine.
  • a tension release pin 62 which abuts the diameter bar 29 of the pressure plate and protrudes beyond the base portion 17 of the stud 18 for operative engagement with any conventional tension releasing linkage of a sewing machine.
  • the tensioning device of this invention thus imposes a resistance to movement of the thread which is in complete independence of the character of the thread, and the transfer of the thread onto and from the tensioning device does not influence the tension imparted thereto.
  • the tensioning device is simple and economical to produce and the composite disk construction of the thread engaging wheel provides for an extremely light and small rotating mass in which the inertia forces and consequent overthrow commonly experienced in prior art rotary tensions is minimized.
  • a rotary thread tensioning device for a sewing machine comprising a stud adapted to be fixed on a sewing machine, a thread engaging wheel rotatably carried on said stud and having a low moment of inertia, said thread engaging wheel comprising a pair of contiguous annular members of sheet material of substantially uniform thickness, each of said annular members being formed inwardly adjacent the periphery with an annular series of openings, said openings in each of said annular members extending inwardly to points equidistant from the axes of said members, said openings defining radial fingers of rectangular cross-sectional shape on each of said members between adjacent openings, means adjacent to said points for securing said members together in continuous contiguous relation with each of said radial fingers being disposed opposite an opening in the opposing member, each of said radial fingers being formed between its ends with an offset portion extending laterally from said points toward said opposing member, said offset radial finger portions protruding completely through the opposite opening of the contiguous
  • a rotary thread tensioning device as set forth in claim 1 in Which a circular hub portion is formed concentrically on a first of said pair of annular members comprising said thread engaging wheel, the second of said pair of annular members being formed concentrically with a circular aperture having a diameter larger than said hub portion of said first annular member, and said adjustable frictioning means carried by said stud contacting only the circular hub portion of said first of said pair of annular members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US782493A 1958-12-23 1958-12-23 Thread tension device for sewing machines Expired - Lifetime US3041008A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US782493A US3041008A (en) 1958-12-23 1958-12-23 Thread tension device for sewing machines
FR813698A FR1243271A (fr) 1958-12-23 1959-12-21 Dispositif tendeur de fil pour machine à coudre
ES0254355A ES254355A1 (es) 1958-12-23 1959-12-21 Un dispositivo giratorio tensor de hilo
GB43568/59A GB867694A (en) 1958-12-23 1959-12-22 Thread tension device for sewing machines
CH8215459A CH389373A (de) 1958-12-23 1959-12-22 Fadenspanneinrichtung an einer Nähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US782493A US3041008A (en) 1958-12-23 1958-12-23 Thread tension device for sewing machines

Publications (1)

Publication Number Publication Date
US3041008A true US3041008A (en) 1962-06-26

Family

ID=25126219

Family Applications (1)

Application Number Title Priority Date Filing Date
US782493A Expired - Lifetime US3041008A (en) 1958-12-23 1958-12-23 Thread tension device for sewing machines

Country Status (5)

Country Link
US (1) US3041008A (fr)
CH (1) CH389373A (fr)
ES (1) ES254355A1 (fr)
FR (1) FR1243271A (fr)
GB (1) GB867694A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797426A (en) * 1971-04-22 1974-03-19 Union Special Maschinenfab Controlled thread tensioner for sewing machines
CN105803694A (zh) * 2016-05-10 2016-07-27 刘影 一种缝纫机夹紧装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US93459A (en) * 1869-08-10 Improvement in tension-device for sewing-machine
US651219A (en) * 1899-04-28 1900-06-05 Universal Winding Co Tension device for winding-machines.
US2315357A (en) * 1940-01-31 1943-03-30 Midland Steel Prod Co Ball-bearing annulus and method of making it
US2360660A (en) * 1943-01-20 1944-10-17 Westinghouse Electric & Mfg Co Welded structure and means and method of welding
US2481096A (en) * 1944-03-09 1949-09-06 Chicago Metal Hose Corp Method and apparatus for making bellows
US2714494A (en) * 1953-09-23 1955-08-02 Specialties Dev Corp Yarn tension compensating device
US2764367A (en) * 1955-09-27 1956-09-25 Fielderest Mills Inc Tension and let-off device and method
US2810532A (en) * 1954-11-23 1957-10-22 Singer Mfg Co Thread tensioning device for sewing machines
US2937605A (en) * 1958-02-14 1960-05-24 Singer Mfg Co Thread tension devices

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US93459A (en) * 1869-08-10 Improvement in tension-device for sewing-machine
US651219A (en) * 1899-04-28 1900-06-05 Universal Winding Co Tension device for winding-machines.
US2315357A (en) * 1940-01-31 1943-03-30 Midland Steel Prod Co Ball-bearing annulus and method of making it
US2360660A (en) * 1943-01-20 1944-10-17 Westinghouse Electric & Mfg Co Welded structure and means and method of welding
US2481096A (en) * 1944-03-09 1949-09-06 Chicago Metal Hose Corp Method and apparatus for making bellows
US2714494A (en) * 1953-09-23 1955-08-02 Specialties Dev Corp Yarn tension compensating device
US2810532A (en) * 1954-11-23 1957-10-22 Singer Mfg Co Thread tensioning device for sewing machines
US2764367A (en) * 1955-09-27 1956-09-25 Fielderest Mills Inc Tension and let-off device and method
US2937605A (en) * 1958-02-14 1960-05-24 Singer Mfg Co Thread tension devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797426A (en) * 1971-04-22 1974-03-19 Union Special Maschinenfab Controlled thread tensioner for sewing machines
CN105803694A (zh) * 2016-05-10 2016-07-27 刘影 一种缝纫机夹紧装置

Also Published As

Publication number Publication date
ES254355A1 (es) 1960-08-01
CH389373A (de) 1965-03-15
GB867694A (en) 1961-05-10
FR1243271A (fr) 1960-10-07

Similar Documents

Publication Publication Date Title
US3041008A (en) Thread tension device for sewing machines
US2437100A (en) Auxiliary bobbin support for use on the shank of a bobbin holder
US2581142A (en) Yarn tensioning device
US3000591A (en) Rotary tension device for sewing machines
US3906647A (en) Hoop for embroidery and the like
US2764894A (en) Apparatus for translating linear motion into rotary motion
US3146969A (en) Thread tensioning device
US3381642A (en) Bobbin case holder for sewing machines
US2955775A (en) Needle thread tension device for sewing machines
US3347195A (en) Tensioning device for a sewing machine
US550701A (en) Cop-holder for sewing-machine shuttles
US2810532A (en) Thread tensioning device for sewing machines
US651219A (en) Tension device for winding-machines.
US4157691A (en) Spool case for sewing machines
US3437284A (en) Smooth tension sewing machine bobbin case and bobbin
US2592318A (en) Thread-cone support for sewing machines
US4039159A (en) Cone holder assembly
US4558834A (en) Yarn tension device
US3026063A (en) Tensioning device
US3861617A (en) Bobbin selectable to vary lower thread tension
US1289066A (en) Tension-indicating device for sewing-machines.
US3095765A (en) Two-speed drive for sewing machines
US3454145A (en) Friction coupling device for a sewing machine
US93459A (en) Improvement in tension-device for sewing-machine
US2553374A (en) Tension device