US3522781A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US3522781A
US3522781A US731600A US3522781DA US3522781A US 3522781 A US3522781 A US 3522781A US 731600 A US731600 A US 731600A US 3522781D A US3522781D A US 3522781DA US 3522781 A US3522781 A US 3522781A
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US
United States
Prior art keywords
cam
sewing machine
knob
stitching
connecting rod
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
US731600A
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English (en)
Inventor
Olindo 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 US3522781A publication Critical patent/US3522781A/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
    • 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
    • D05B3/02—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 with mechanisms for needle-bar movement
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • the first cam controls the position of an intermediate connecting rod in contact with a rocking slideway, so as to define the amplitude of said transverse movement
  • the second cam controls the location of the pivot of said rocking slideway, so as to define the eccentricity of the transverse movement of the cradle carrying the needle bar.
  • a further adjusting cam on said common shaft acts on the usual main cam controlling the direction and amplitude of the movements of the fabric-feeding claw.
  • the present invention has for its object a sewing machine comprising a frame carrying a mechanism driving a claw feeding the piece to be sewn, a needle bar and a thread guide, of
  • the type wherein the needle bar sliding inside a cradle is adapted to rock under the action of a cam controlling the zigzag motion of the needle and engaging a slideway the pivotal axis of which may be displaced with a view to adjusting the eccentricity of the needle, while a connecting rod transmits the pivotal movement of the slideway to cradle, said connecting rod engaging the slideway at an adjustable point defining the amplitude of the zigzag stitching and a main control cam allows adjusting the direction and amplitude of the movements of the feeding claw.
  • the present invention has for its object an improved sewing machine including two auxiliary cams to wit: a cam adjusting the point at which the connecting rod engages the slideway and a cam adjusting the position of the pivotal axis of the slideway, which cams are fitted on a common shaft so that a common control knob secured to said common shaft allows executing both adjustments.
  • FIGURE 1 is an elevational, partly sectional view of the upper arm of said sewing machine.
  • FIGURE 2 is a plan view, partly in section of said upper arm.
  • FIGURE 3 is a detail view of the part of the mechanism controlling the zigzag motion of the needle, that is the breadth of the stitching.
  • FIGURE 4 is a detail view of the part of the mechanism controlling the eccentricity of the needle.
  • FIGURE 5 is a detail view of the part of the mechanism adjusting the amplitude of the zigzag motion.
  • FIGURE 6 is a front view of a knob controlling the sewing machine.
  • the sewing machine includes a frame 1 carrying the entire mechanism driving the different parts of the sewing machine, that is the fabric feeding claw 2, the needle bar 3 carrying the needle which is not illustrated and the thread guide 4.
  • Said driving mechanism includes a shaft 6 extending horizontally within the upper arm of the sewing machine and guided at its left-hand end in a bearing 7 and a similar bearing at its right-hand side, which latter is not illustrated.
  • Said shaft 6 carries a counterweight 8 to which is secured a trunnion 9 to which is pivotally secured in turn a connecting rod 10 controlling the axial movements of the needle bar 3.
  • Said connecting rod 10 is pivotally secured to a further trunnion II which is pivotally secured in its turn at 12 to a flange l3 rigid with the needle bar 3.
  • Said needle bar 3 is slidably carried in a cradle 14 adapted to rock around a spindle 15 secured to the frame 1 of the sewing machine.
  • the trunnion 9 carries also a crank 16 driving the foot 17 of the thread guide 4, an intermediate point 18 of which is pivotally secured to a link 19 pivotally secured in turn at 20 to the frame 1.
  • the transverse movements of the needle bar 3 controlling the zigzag stitching are controlled by a triangular cam 21 adapted to freely revolve around a spindle 22.
  • Said spindle 22 is revolvably carried by the frame I and its front end carries a control knob 23.
  • Said triangular cam 21 is rigid with a pinion 71 meshing with a worm wheel 24 secured to the horizontal shaft 6 by a locking screw 25.
  • a second spindle 26 is carried in parallelism with the spindle 22 inside the frame 1 of the sewing machine. To said spindle 26 are pivotally secured two levers 27 and 28.
  • the lever 27 (FIGS.
  • l and 5 carries at its end 29 a trunnion engaging an elongated slot 30 formed in a connecting rod 31 pivotally secured at 32 to the rocking cradle 14.
  • Said cradle is subjected to the pressure of a compression spring 33 which urges the cradle 14 clockwise.
  • the right-hand projecting end 34 of the connecting rod 31 slidably engages a slideway 35 formed on an arm 36 pivotally secured at 37 to the end of the other lever 28, as illustrated in FIGURE 3.
  • Said arm 36 is provided with a boss 38 adapted to follow the outline of the triangular cam 21.
  • the lever 27 is provided with a projection 39 urged into contact with the outline of a further cam 40 keyed to the same spindle 22.
  • Said cam 40 controls the breadth of the stitch, that is the amplitude of the zigzag stitching motion.
  • Said lever 27 is subjected to the pressure of a spring which is not illustrated which urges said lever clockwise around the spindle 26, so as to ensure the permanent engagement of the projection 39 with the cam 40.
  • the lever 28 carrying the pivot 37 of the slideway 35 carries also a feeler 41 adjustably secured to it by a screw 42 and a nut 43, as illustrated in FIGURE 4.
  • a spring which is not illustrated acts on the lever 28 so as to urge it to pivot clockwise and to make said feeler 41 engage the outline of a further cam 44 keyed to the same spindle 22, said cam being adapted to control the eccentricity of the needle bar.
  • the pivotal axis 32 between the connecting rod 31 and the cradle 14 is carried by an eccentric member 45 (FIG. 2) fitted inside a housing formed in the cradle 14, said eccentric member being locked in position by a screw 46.
  • the sewing machine illustrated includes of course a mechanism driving the claw feeding the fabric to be sewn, which mechanism is illustrated only to a partial extent in the accompanying drawings. In fact, only a fraction of the means adjusting said mechanism providing for the progression of the fabric to be sewn has been illustrated.
  • Said adjusting means include a cam 47 carried by a spindle 48 to the end of which is secured a control knob 49 projecting to the front of the sewing machine.
  • Said cam 47 is angularly rigid with the spindle 48 provided by a pin 50 engaging a longitudinal notch 51 in a hub 52 rigid with the cam 47.
  • a spring 53 holds said hub 52 in its position -of engagement with said pin 50, while it allows an axial shifting of the cam 49 against the pressure of said spring 53.
  • Said cam 47 is adapted to act through its outline on a follower 54 carried by an arm 55 secured to the upper end 56 of the shaft contolling the movements of the fabric feeding means of the sewing machine.
  • Said projection 54 is adjustably secured by a screw 57 and a nut 58 on the arm 55.
  • the spindle 22 carries, in addition to the adjusting cams 40 and 44 a further adjusting cam 59.
  • a lever 60 is pivotally secured at 61 to the frame 1.
  • One end 62 of said lever 60 is held in contact with the bell-shaped outline of the cam 59.
  • the other end 63 of said lever 60 is adapted to act on the plane transverse surface 64 forming the back of the cam 47.
  • This cam 59 is formed in a manner such that it provides an easy control of the sewing of button holes in a semi-automatic manner on said sewing machine.
  • the angular setting of the different adjusting cams 40, 44 and 59 is provided in a manner such that their outline is superposed over a fraction of their angular movement, which is necessary so as to allow a semi-automatic sewing of buttonholes through operation of the control knob 23.
  • Said control knob 23 is illustrated in FIGURE 6 with the different adjusting areas drawn on the latter:
  • the adjusting area of the knob 23 serves for controlling the breadth of the stitch, that is the amplitude of the zigzag motion of the needle.
  • the knob controls the eccentricity of the needle.
  • the lefthand edge of the button-hole is stitched during the forward progression of the fabric in the sewing machine, while the knob has its reference mark E in registry with a stationary mark on the frame of the machine.
  • the knob 23 is brought into the position F, with a view to stitching the closing or connecting points between the two edges at the corresponding end of the button-hole.
  • the knob 23 is brought into its position G, so as to provide for the stitching of the right-hand edge of the button-hole during a return movement of the fabric in the sewing machine.
  • said right-hand edge has been sewn, the knob 23 is returned into the position F for the execution of the connecting or closing stitches across the second end of the button-hole.
  • the sewing of the button-hole is then stopped by returning the knob 23 into its position D.
  • the knob 23 is kept in a steady position in its different operative areas by a plunger piston 66 sliding inside a housing 67 formed in the frame 1, which housing encloses a spring 68 urging the piston 66 into contact with the periphery 69 of the knob 23.
  • the periphery 69 is provided with positioning notches 70 ensuring stability of the knob 23 in the different angular positions required.
  • the shaft 6 is driven and controls the axial reciprocation of the needle bar 3 and consequently of the needle.
  • the knob 23 has its reference mark A in registry with the stationary reference mark carried by the sewing machine frame, the projection 34 on the connecting rod 31 registers with the pivotal point 37 of the slideway 35 or even possibly beyond said point, so that no movement can be transmitted to the connecting rod 31 and therefore the cradle 14 remains stationary.
  • the knob 23 controls through the cam 59 the mechanism adjusting the fabric feeding means, the position E corresponding to a progression with close stitches whereas the positions F and G correspond to a receding movement, also with close stitches, the stitches having the same amplitude during forward and rearward progression.
  • the outlines of the cams 40 and 59 are superposed over a portion of their periphery, so that for the positions E and G, the amplitude or the breadth of stitching may correspond to the breadth of one edge of the button-hole.
  • the amplitude or the breadth of the stitches is equal to the complete breadth of the button-hole, that is the breadth corresponding to the stitching of the connection between the two edges of said button-hole.
  • the outline of the cam 44 shifting the needle bar eccentrically is also superposed over the outlines of the two other cams 40 and 59, so as to produce an eccentric or lateral shifting of the needle whenever the stitching of the first edge is at an end and the stitching of the second edge of the button-hole is to begin.
  • the cradle 14 carrying the needle bar 3, instead of pivoting around a horizontal pivotal axis 15, may be adapted to rock around a vertical axis extending in parallelism with the needle bar 3.
  • the further adjusting cam 59 and the lever 60 may be omitted: the stitching of the button-hole is then executed by operating in addition to the knob 23 provided for the change in amplitude of the zigzag stitching and for the eccentricity of the needle bar the knob 49 defining the progression of the fabric feeding means with a view to stitching with close stitches.
  • the second edge of the button-hole would then be executed by causing the fabric to be sewn to pivot through around the needle when the first edge has been sewn.
  • a sewing machine comprising a frame, a fabric feeding claw, a thread guide, a needle bar adapted to be shifted eccentrically and to execute a transverse movement for zigzag stitching, a mechanism controlling the operation of said claw, thread guide and needle bar and including a main control cam adapted to adjust the direction and amplitude of the movements of the fabric feeding claw, a cradle inside which the needle bar is slidingly carried and pivotally secured to the frame, a connecting rod coupled to said cradle for controlling the angular postition of the cradle, a rocking member including an adjustable pivot and having an adjustable point of engagement with said connecting rod for controlling said connecting rod, a first cam controlling said rocking member to produce the transverse movement of the needle bar, two coaxial cams adjusting respectively the point of engagement between the connecting rod and the rocking member to define the amplitude of the transverse movement of the needle bar and the position of the pivot of said rocking member, to define the eccentricity of the needle bar, a common shaft for said adjusting cams and

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US731600A 1967-05-26 1968-05-23 Sewing machine Expired - Lifetime US3522781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH747967A CH457105A (fr) 1967-05-26 1967-05-26 Machine à coudre

Publications (1)

Publication Number Publication Date
US3522781A true US3522781A (en) 1970-08-04

Family

ID=4325762

Family Applications (1)

Application Number Title Priority Date Filing Date
US731600A Expired - Lifetime US3522781A (en) 1967-05-26 1968-05-23 Sewing machine

Country Status (12)

Country Link
US (1) US3522781A (zh)
AT (1) AT297460B (zh)
BE (1) BE714862A (zh)
CH (1) CH457105A (zh)
DE (2) DE6609561U (zh)
DK (1) DK121639B (zh)
ES (1) ES353851A1 (zh)
FR (1) FR1560035A (zh)
GB (1) GB1163689A (zh)
IE (1) IE32339B1 (zh)
NL (1) NL6807347A (zh)
SE (1) SE363360B (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219488A1 (de) * 1971-04-20 1972-11-02 Mefina S.A., Freiburg (Schweiz) Nähmaschine
US4190008A (en) * 1977-12-22 1980-02-26 Mefina S.A. Zigzag stitch sewing machine
US4414907A (en) * 1982-04-05 1983-11-15 The Singer Company Buttonhole width adjusting mechanism
US5775239A (en) * 1997-01-06 1998-07-07 Amf Reece, Inc. Double cam drives for a buttonhole sewing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5830050Y2 (ja) * 1977-02-02 1983-07-01 蛇の目ミシン工業株式会社 ミシンの送り調節装置
US5819674A (en) * 1996-09-19 1998-10-13 Amf Reece, Inc. Bight mechanism for a buttonhole sewing machine
DE102010061039B4 (de) * 2010-12-06 2014-04-10 Kokinetics Gmbh Verstellmechanismus zum Verstellen einer Mechanik

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219488A1 (de) * 1971-04-20 1972-11-02 Mefina S.A., Freiburg (Schweiz) Nähmaschine
US4190008A (en) * 1977-12-22 1980-02-26 Mefina S.A. Zigzag stitch sewing machine
US4414907A (en) * 1982-04-05 1983-11-15 The Singer Company Buttonhole width adjusting mechanism
US5775239A (en) * 1997-01-06 1998-07-07 Amf Reece, Inc. Double cam drives for a buttonhole sewing machine

Also Published As

Publication number Publication date
IE32339B1 (en) 1973-06-27
DE1760435C3 (zh) 1974-06-27
ES353851A1 (es) 1969-10-16
NL6807347A (zh) 1968-11-27
SE363360B (zh) 1974-01-14
DE6609561U (de) 1972-07-06
IE32339L (en) 1968-11-26
DK121639B (da) 1971-11-08
DE1760435B2 (de) 1973-11-22
GB1163689A (en) 1969-09-10
DE1760435A1 (de) 1971-12-30
FR1560035A (zh) 1969-03-14
CH457105A (fr) 1968-05-31
BE714862A (zh) 1968-09-30
AT297460B (de) 1972-03-27

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