US3777685A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US3777685A
US3777685A US00230263A US3777685DA US3777685A US 3777685 A US3777685 A US 3777685A US 00230263 A US00230263 A US 00230263A US 3777685D A US3777685D A US 3777685DA US 3777685 A US3777685 A US 3777685A
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US
United States
Prior art keywords
presser foot
motor
coupling device
needle
machine
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
US00230263A
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English (en)
Inventor
O Baruffa
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Application granted granted Critical
Publication of US3777685A publication Critical patent/US3777685A/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
    • D05B29/00—Pressers; Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/36—Devices for stopping drive when abnormal conditions occur, e.g. thread breakage

Definitions

  • the frame of the machine comprises a base, a column, [22] Filed: Feb. 29, 1972 an upper arm ending in a needle-bearing head, and a lower part containing a cloth transport actuating [21] Appl' 230263 mechanism.
  • the frame houses a main drive shaft for the machine mechanism and an electric motor.
  • the [30] Foreign Application Priority Data needle-bearing head includes a presser foot control Marv 11, 1971 Switzerland 3568/71 device movable between an PP and a lower P tion above the cloth transport element. There is a cou- 52 U.S.
  • the member is constituted by a me- 5 References Cited chanical linkage between the presser foot control de- UNITED STATES PATENTS vice and the coupling device to bring the latter into inactive position when the presser foot is brought into upper position.
  • SEWING MACHINE In the use of sewing machines, there is a risk, when the user withdraws or places the fabric in position under the presser foot, that the machine may unexpectedly be put into operation as a result of an accidental movement, clumsiness or external interference, for example by a child.
  • the sewing machine has a frame which comprises a base, a column, an upper arm terminated by a needle-carrying head, a lower portion containing a transporter actuating mechanism, this frame housing a principal drive shaft for the machine mechanism and an electric motor, the needle-carrying head comprising a control device for a presser foot movable between a high position and a low position above the transporter.
  • This machine which comprises also a coupling device between the motor and the principal shaft and a member capable of being actuated by the control device of the presser foot to prevent the driving of the principal shaft by the motor when the presser foot is in high position, is characterized in that the said member is constituted by a mechanical linkage between the control device of the presser foot and the coupling device to bring the latter into inactive position when the presser foot is brought into high position.
  • FIG. 1 is a front view of this embodiment
  • FIG. 2 is a partial section along the line II--II of FIG.
  • FIG. 3 is a section along the line III-III of FIG. 1
  • FIG. 4 is a section along the line IV-IV of FIG. 3;
  • FIG. 5 is a view with partial section along the line VV of FIG. 4;
  • FIG. 6 is an explanatory section along the line VIVI of FIG. 4.
  • the embodiment shown comprises a frame formed by a base I supporting a column 2 and an upper arm 3 which is terminated by a needle-carrying head 4.
  • the lower portion formed by the base 1 contains an actuating mechanism for a transporter, this mechanism not being shown, since it does not form part of the invention.
  • the upper arm 3 houses a principal drive shaft 5 of the machine mechanism, this shaft 5 bearing at its end a flywheel 6.
  • the driving of the mechanism of the sewing machine is effected by an electric motor 7 which is mounted to rock on an axis 8 inside the column 2.
  • the shaft 9 of the motor 7 bears a drive roller 10 capable of coming into cooperation as desired with one or other of two rollers 11 and 12 (FIG. 5) according to the position of the motor 7.
  • the roller 12 is mounted on a rocker arm 13 urged by a spring 14 and enables the rotary movement of the drive roller 10 to be transmitted to the flywheel 6 to provide the drive of the sewing machine mechanism.
  • the roller 11 is mounted on a rocker arm 15 urged by a spring 16 and enables the rotation of the drive roller 10 to be transmitted to a disc 17 fast to a shaft 18 mounted pivotably in the front wall of the column 2.
  • This shaft 18 enables a bobbin fixed on the latter to be rotated in order to allow the thread to be wound on the bobbin.
  • the flywheel 6 must be driven in anti-clockwise direction, this direction of rotation being the same for the roller 10 (FIG. 6) of the motor 7.
  • the tangential forces exerted on the roller 12 by the roller 10 on one hand, and by the flywheel 6 on the other hand produce a resultant which tends to push this roller 12 between the drive roller and the driven flywheel.
  • This resultant has therefore the effect of increasing the mutual thrust between these three movable parts.'The same conditions are also produced. on driving the bobbin winding device, so that the transmission of the drive torque of the roller 10 to the disc 17 has the effect of increasing the pressing force of the roller 11 on the roller 10 and the disc 17.
  • the movement of the motor 7 around its axis 8 are actuated from'the control mechanism of the presser foot 19 seen in FIG. 1.
  • the control mechanism of the presser foot is shown in more detail in FIG. 2.
  • This mechanism comprises a control lever 20 which is shown infull line in the position corresponding to the low position of the presser foot, and in dashed line in the high position of the presser foot.
  • This lever acts on a part 21 fast to the presser foot bar 22.
  • This bar is urged downwardly by a spring, not shown.
  • the lever 20 pivots at 23 and .bears a pivot 24 for one end of a link rod 25 of which the other end is hinged on an arm 26 fast to a rod 27.
  • the latter is housed in the upper arm 3 of the machine, and its other end bears an arm 28 which is seen in FIGS. 3, 4 and 6.
  • This arm 28 cooperates with a lever 29 of triangular shape hinged at 30 on the frame of the machine.
  • the end of the arm 28 has a hole 31 in which a pin 32 borne by the lever 29 is engaged.
  • the diameter of this hole 31 is greater than that of the pin 32.
  • the latter is subject to the effect of a spring 33 which is supported, on the other side, against the rod 27.
  • the assembly of the arm 28 of the lever 29 and of the spring 33 constitutes a sort of knee member with two stable positions which are shown in FIG. 6 in full line and dashed line respectively, the latter position corresponding to the high position of the presser foot control device.
  • the lever 29 has also a pin 34 which is moved to 34' in the raised position of the presser foot. The movement of this pin actuates a corresponding pivoting of the motor 7 around its axle 8, since the motor has a fork-shaped part 35 with two arms between which the pin 34 is engaged.
  • the presser foot device could be a switch mounted in the supply circuit of the motor.
  • a sewing machine including a frame comprising a base, a column, an upper arm and a needle bearing head, a work-feeding mechanism housed in said base, an electric motor rockably mounted in said column, a main drive shaft for the machine mechanism housed in said upper arm and a presser foot bar mounted in said needle-bearing head, the improvement comprising a first coupling device between said motor and said main shaft, 21 control lever articulated on said needle-bearing head for moving said presser foot bar between a high position and a low position above said work-feeding mechanism, a rod connected to said lever and housed in the upper arm of said machine, a mechanical linkage system connected with said rod, actuation of said control lever controlling the displacements of said electric motor in a first position, in driving engagement with the said first coupling device when the presser bar is lowered, and in a second position, out of engagement with the said first coupling device, when the presser bar is raised.
  • a sewing machine including a bobbin winding device, a second coupling device between the motor and said bobbin winding device, the motor being in driving engagement with said second coupling device when the presser bar is raised.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00230263A 1971-03-11 1972-02-29 Sewing machine Expired - Lifetime US3777685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH356871A CH526666A (fr) 1971-03-11 1971-03-11 Machine à coudre

Publications (1)

Publication Number Publication Date
US3777685A true US3777685A (en) 1973-12-11

Family

ID=4258803

Family Applications (1)

Application Number Title Priority Date Filing Date
US00230263A Expired - Lifetime US3777685A (en) 1971-03-11 1972-02-29 Sewing machine

Country Status (16)

Country Link
US (1) US3777685A (fr)
AR (1) AR193722A1 (fr)
AT (1) AT317655B (fr)
BE (1) BE779952A (fr)
BR (1) BR7201334D0 (fr)
CA (1) CA943010A (fr)
CH (1) CH526666A (fr)
DE (1) DE2210290C3 (fr)
DK (1) DK136540B (fr)
ES (1) ES400625A1 (fr)
FR (1) FR2141027A5 (fr)
GB (1) GB1351102A (fr)
IE (1) IE36128B1 (fr)
IT (1) IT952911B (fr)
NL (1) NL7202608A (fr)
SE (1) SE381478B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459927A (en) * 1983-12-12 1984-07-17 The Singer Company Arrangement for signaling presser bar position
US4503792A (en) * 1983-09-09 1985-03-12 The Singer Company Pivotable motor with mounting pin
US4709644A (en) * 1985-06-20 1987-12-01 Tokyo Juki Industrial Co., Ltd. Sewing machine presser foot lifting apparatus
US4840135A (en) * 1985-12-03 1989-06-20 Mitsubishi Denki Kabushiki Kaisha Sewing machine controller inhibiting sewing in unsafe conditions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH658268A5 (de) * 1983-03-23 1986-10-31 Gegauf Fritz Ag Verfahren und vorrichtung zum steuern des stoffschiebers einer naehmaschine.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2277475A (en) * 1940-04-09 1942-03-24 Samuel B Bilger Sewing machine
US2758558A (en) * 1953-07-16 1956-08-14 Singer Mfg Co Sewing machine drives
US2943586A (en) * 1958-09-02 1960-07-05 White Sewing Machine Corp Bobbin winding mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2277475A (en) * 1940-04-09 1942-03-24 Samuel B Bilger Sewing machine
US2758558A (en) * 1953-07-16 1956-08-14 Singer Mfg Co Sewing machine drives
US2943586A (en) * 1958-09-02 1960-07-05 White Sewing Machine Corp Bobbin winding mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503792A (en) * 1983-09-09 1985-03-12 The Singer Company Pivotable motor with mounting pin
US4459927A (en) * 1983-12-12 1984-07-17 The Singer Company Arrangement for signaling presser bar position
US4709644A (en) * 1985-06-20 1987-12-01 Tokyo Juki Industrial Co., Ltd. Sewing machine presser foot lifting apparatus
US4840135A (en) * 1985-12-03 1989-06-20 Mitsubishi Denki Kabushiki Kaisha Sewing machine controller inhibiting sewing in unsafe conditions

Also Published As

Publication number Publication date
DE2210290B2 (de) 1978-05-03
GB1351102A (en) 1974-04-24
IE36128B1 (en) 1976-08-18
BE779952A (fr) 1972-06-16
DE2210290A1 (de) 1972-09-14
FR2141027A5 (fr) 1973-01-19
IT952911B (it) 1973-07-30
DK136540B (da) 1977-10-24
IE36128L (en) 1972-09-11
NL7202608A (fr) 1972-09-13
DE2210290C3 (de) 1978-12-21
CA943010A (en) 1974-03-05
CH526666A (fr) 1972-08-15
AR193722A1 (es) 1973-05-22
SE381478B (sv) 1975-12-08
ES400625A1 (es) 1975-02-01
BR7201334D0 (pt) 1973-06-07
AT317655B (de) 1974-09-10

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