US3160126A - Zig-zag sewing machine - Google Patents

Zig-zag sewing machine Download PDF

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Publication number
US3160126A
US3160126A US240054A US24005462A US3160126A US 3160126 A US3160126 A US 3160126A US 240054 A US240054 A US 240054A US 24005462 A US24005462 A US 24005462A US 3160126 A US3160126 A US 3160126A
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US
United States
Prior art keywords
lever
cam
armed
needle bar
frame
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
US240054A
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English (en)
Inventor
Moro Antonio
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.)
Fratelli Borletti SpA
Borletti SpA
Original Assignee
Borletti SpA
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.)
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Publication date
Application filed by Borletti SpA filed Critical Borletti SpA
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Publication of US3160126A publication Critical patent/US3160126A/en
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    • 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
    • D05B3/24—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 formed by general-purpose sewing machines modified by attachments, e.g. by detachable devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2501/00—Wearing apparel
    • D10B2501/06—Details of garments
    • D10B2501/062—Buttonholes

Definitions

  • the width of the stitch and the origin of the stitch itself are controlled by the manual operation of two separate members, and, the length of the stitch and the forward or rearward movement of the material are controlled by the manual operation of another member.
  • buttonsholes with a zig-zag machine of known type it is therefore necessary to manipulate these control members for each part of the buttonhole, that is the two cords, on the left and right of the buttonhole as seen by the operator, and the two bars, to the front and rear of the buttonhole as seen by the operator.
  • the transport mechanism is adjusted for rearward movement of the material, after the origin of the zig-zag stitch has been set to the left and the desired width of the zig-zag has been set by means of the appropriate controls to produce the front bar of the buttonhole, the transport of the material must, while the length of the stitch remains fixed, be adjusted for forward movement and the control regulating the width of the zigzag must be actuated to obtain the desired width of the bar.
  • the device according to the present invention makes it possible to obtain the same result with a considerable constructional simplicity and moreover aliords the possibility of adjusting the width of the buttonhole at will without adding supplementary members.
  • An object of this invention is to provide a zig-zag sewing machine in which the tappet lever transmitting its movements under the control of a rotating cam to the link for the transverse actuation of the needle bar in a zig-zag sewing machine provided with means for varying the width of the zigzag is formed in two parts carrying respectively the tappet and the fork engaging the link,
  • FIG. 1 shows a complete buttonhole of pre-established dimensions
  • FIGS. 2A, 2B, 2C and 2D show the successive stages in the making of the same buttonhole
  • FIGS. 3 to 6 are diagrammatic partial front views of a zig-zag sewing machine incorporating the device according to the invention, in the positions for producing the left-hand cord, the front bar, the right-hand cord and the rear bar, respectively, of the buttonhole,
  • FIGS. 3A and 3B illustrate in two different positions a modified constructional form of a detail of FIGS. 3 to 6,
  • FIG. 7 is an end view, partly in section, of the device illustrated in FIGS. 3 to 6,
  • FIG. 8 shows a detail in section on the line VIII-VHI of FIG. 7,
  • FIGS. 12 and 13 are views similar to those of FIGS. 10 and 11 of a modified constructional form of the control knob
  • FIG. 14 is a partial view of a modified constructional form of the device in a position corresponding to that of FIG. 5,
  • FIG. 15 is a section on the line XVXV of FIG 14,
  • FIG. 16 shows another alternative construction in a position corresponding to that of FIG. 4,
  • the zig-zag sewing machine illustrated (FIGS. 3 to '6) has a main driving shaft 1 which transmits its rotation to a shaft 2, on which a cam 3 is fixed, by means of a toothed Wheel 4 meshing with a wheel 5 fixed to the shaft 2.
  • the cam 3 has a certain number of teeth or peripheral projections 6 on which there rests under pressure, due to the etfect of a spring 7, the tappet 8 of a lever 9 pivoted on a fixed spindle It).
  • the transmission ratio between the shaft 1 and the shaft 2 and the number of teeth of the cam 3 are chosen in such manner that for each revolution of the shaft 1 the lever 9 performs a half oscillation.
  • the lever 9 is pivoted loosely on a sleeve 11 which, in turn, is mounted rotatably on the fixed spindle 10.
  • Fixed for rotation with the sleeve 11 is a lever 12 having two arms 15 and 16, the first of which carries a fork 17 controlling a tie rod or link 18 for the transverse actuation of the needle bar and is superposed on a radial extension 19 of the lever 9 with which it is associated by means of a screw 2t ⁇ (FIG.
  • the other arm 16 of the two-armed lever 12 terminates i; in a fork 24 with the two arms thereof having divergent facing surfaces 24, 24", which cooperates with an eccentric 25 fast with a spindle 26 (FIG. 10) provided with a manual control knob 27, for determining the position of the arm 16.
  • this arrangement also allows the element 30 to be operated in the direction of the arrow f by means of the cams 31 so as to cause the strip 29 to rotate in engagement with the end 28' of the eccentric 28, on the pin 37, and, on overcoming the spring 39,
  • the fork 24 is mounted on the arm 16 of the two-formed lever 12, so as to be adjustable along the axis of said armf this end, the shank of the fork and the arm 16 have two slots 41 and 42, respectively, aligned on said axis and in the first of which there is engaged a guide pin 43 of the arm 16, while through the second slot there extends a clamping screw 44' carried by the shank of the fork and which locks the latter in the desired position.
  • This arrangement together with the divergence of the facing surfaces 24, 24 of the two arms of the fork, allows the relative positions of the fork 24 and the eccentric 25 to be adjusted easily during the assembly stage in such man-.
  • the branch 46 is pivoted to the arm at 50 and can be locked on said arm by the screw 51.
  • the facing surfaces 24', 24 of the forkstill form part of arms 45, 46 respectively, which are constructionally separate and adapted to assume an-,
  • the arm is pivoted at 47' to a second extension 52 of the lever 9 and only the arms 46 is pivoted at to the arm 16 of the fork 1.2.
  • the fixing of the arms 45, 46 in the desired angular position- is obtained by means of screws 43', 51' respectively, extending through slots 4? in the extension 52 and the arm 16.
  • branch 45 In practice, one or the other of the embodiments described may be chosen or constructed according to the type of machine in which the device is fitted.
  • the knob 27 controlling, on the one hand, the positions of the arm 16 of the two armed lever 12 and, therefore, of this same lever and, on the other hand, the amplitude and direction of the transport of the material can assume four positions with respect to a fixed index 53. In the embodiment according to FIGS. 9 to 11, these positions are determined by the engagement of a resilient tooth 5 of a ring 55 fixed to the frame 56 with the edge 57 of radial grooves 58 in the rear face of the knob 27., In the embodiment according to FIGS.
  • a plunger 59 slidable in a radial hole 66 in the boss 56 on the frame 56 which supports the spindle 26, and placed under the action of the spring 61 which causes said plunger to adhere to cylindrical surfaces 62 having a helical profile which are disposed on the inside of the knob 27 and terminate in radial stop surfaces 63. Both arrangements permit rotation of the knob 27 only in the direction of the arrow f, thus preventing wrong operation.
  • the knob 27 carries on the front of its rim 2.7, in correspondence with the grooves 53 or the surfaces 63; special symbols :1, b, c, d, which may also be simple numbers, indicating the operations which are carried out by the machine when these symbols are brought into correspondence with the fixed index 53.
  • the special symbols, or numbers may be arranged with equivalent results on the fixed part, at the periphery of the knob, and the index on the knob.
  • the locking or arresting of the lever 12 in one direction or the other is obtained by means of the eccentric 25 operated by the knob 27.
  • the second eccentric 28 which in the position shown in FIG. 3, pushes the strip 29 so as to bring the known element 30 and, therefore, the lever 32 and the slider 34 regulating the movements of the connecting rod 35 which, in turn, imparts the movements to the transporter, into a position to ensure the direction of movement of the material.
  • the knob 27 is prearranged for the upper bar.
  • the knob 27 is rotated through 90 so that the symbol b comes into coincidence with the index 53.
  • the eccentrics 25 and 23 are no longer in contact with the surface 24' of the fork 24 and with the strip 29', respectively.
  • the lever 12 is therefore completely free to perform the complete oscillations imparted by the teeth 6 of the cam 3 and the lever 32 of the control device of the transporter returns to the position of forward transport of the material because of the spring 33.
  • the fork 17, being no longer impeded transmits to the needle bar the maximum transverse zig-zag movemerits, causing the needle to shift alternately from the position B to the position B, so as to form the front bar b (FIG. 2B).
  • the knob 27 is rotated by another step, causing the symbol c to coincide with the index 53.
  • the eccentric 25 is disposed in contact with the surface 24" of the fork 24-, while the eccentric 28, not touching the strip 29, leaves the transporter prearranged for moving the material forward.
  • the teeth 6 cause the lever 9 to perform complete oscillations, but, the lever 12 being arrested, after a pre-fixed stroke, by contact of the surface 24" with the eccentric 25, the fork 17 also stops after a given stroke from right to left and, consequently, also the needle bar which oscillates between the positions C and C.
  • the transporter For producing the latter, the transporter must cause the material to run to the rear, that is towards the operator. Therefore, in the position of the knob 27 in which the symbol 0! coincides with the index 53, the eccentric 28 pushes the strip 29 so as to bring the lever 32 back to the position of rearward movement, equivalent to that of FIG. 3.
  • the device described can also function with cams of a type different to that indicated by the reference 3 in the foregoing description, it being only essential, as stated at the beginning, that the-transmission ratio between the main shaft and the shaft of the cam and the number of teeth ofthe cam be choosen in such manner that the lever carrying the tappet performs a half oscillation at each revolution of the main shaft.
  • the cam has twelve teeth
  • the main shaft performs 24 revolutions for one revolution of the cam.
  • a zigzag-stitch sewing machine for making buttonholes comprising:
  • a zigzag-stitch sewing machine for making buttonholes comprising: (a) a frame, (b) a drive shaft rotatably mounted in said frame, (c) a needle bar guide pivoted on said frame, (d) a needle bar slidably mounted on said needle bar guide, a cam actuated by said drive shaft, said cam having an outer periphery comprised of alternate raised and lowered surfaces,
  • a zigzag-stitch sewing machine for making buttonholes comprising:
  • a first eccentric mounted on said frame coaxial with and actuated by hand-setting means, said first eccentric engaging said second fork of said second lever for limiting the oscillation of said second lever in a direction of rotation so as to allow preselected widths of a zigzag stitch to be used for making bars and cords of a buttonhole, and
  • a zigzag-stitch sewing machine for making buttonholes comprising: a

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
US240054A 1961-12-02 1962-11-26 Zig-zag sewing machine Expired - Lifetime US3160126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2183061 1961-12-02

Publications (1)

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US3160126A true US3160126A (en) 1964-12-08

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US240054A Expired - Lifetime US3160126A (en) 1961-12-02 1962-11-26 Zig-zag sewing machine

Country Status (5)

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US (1) US3160126A (fr)
BE (1) BE625401A (fr)
CH (1) CH388746A (fr)
DE (1) DE1485142A1 (fr)
GB (1) GB1007478A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5819674A (en) * 1996-09-19 1998-10-13 Amf Reece, Inc. Bight mechanism for a buttonhole sewing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216731A (en) * 1978-11-02 1980-08-12 The Singer Company Automatic buttonhole stitch proportioning device for sewing machines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972319A (en) * 1954-08-06 1961-02-21 F Ili Borletti S P A Apparatus for obtaining in a zig-zag sewing machine an automatic displacement of thefabric apt to be amplitude adjusted
US3068817A (en) * 1960-04-26 1962-12-18 White Sewing Machine Corp Zig-zag sewing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972319A (en) * 1954-08-06 1961-02-21 F Ili Borletti S P A Apparatus for obtaining in a zig-zag sewing machine an automatic displacement of thefabric apt to be amplitude adjusted
US3068817A (en) * 1960-04-26 1962-12-18 White Sewing Machine Corp Zig-zag sewing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5819674A (en) * 1996-09-19 1998-10-13 Amf Reece, Inc. Bight mechanism for a buttonhole sewing machine

Also Published As

Publication number Publication date
GB1007478A (en) 1965-10-13
CH388746A (it) 1965-02-28
DE1485142A1 (de) 1969-05-14
BE625401A (fr)

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