US3468270A - Sewing machine for straight or zigzag sewing - Google Patents

Sewing machine for straight or zigzag sewing Download PDF

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Publication number
US3468270A
US3468270A US618830A US3468270DA US3468270A US 3468270 A US3468270 A US 3468270A US 618830 A US618830 A US 618830A US 3468270D A US3468270D A US 3468270DA US 3468270 A US3468270 A US 3468270A
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United States
Prior art keywords
pin
zigzag
cam
sewing
lever
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Expired - Lifetime
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US618830A
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English (en)
Inventor
Antonio Moro
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Fratelli Borletti SpA
Borletti SpA
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Borletti SpA
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • a sewing machine for domestic use of the type adapted to produce straight zigzag stitching and having an oscillating pendulum, a needle bar slidably mounted in the pendulum, a cam for imparting the oscillation, a transmission rod associated at one end with the pendulum and at the other end with an oscillating lever driven by the cam to reciprocate the transmission rod, is improved in two respects:
  • An operating knob and an eccentric pin fast therewith shift the axis of oscillation of the lever so as to stitch to the right or to the left or on center or in any other intermediate position;
  • the object of the present invention is a sewing machine of the type adapted to carry out straight or zigzag stitching, this machine being for domestic use and cheap to make.
  • the aim of the present invention is precisely to produce a machine which, in addition to normal straight sewing, will also carry out zigzag sewing by the use of mechanisms which are simply constructed and easy to apply and also of control elements adapted to be actuated from outside the machine and which are practical to use and can be used instantaneously.
  • the sewing machine according to the present invention is more precisely of the type comprising a needle bar slidable in an oscillating pendulum, a cam controlling the oscillation and a transmission rod associated directly at one end with the said pendulum and co-operating indirectly at the other end with the said cam to transmit the oscillation produced by the latter to the said pendulum;
  • the machine is characterised substantially in that an oscillating lever with an arm having .an action of adjustable amplitude is interposed between the profile of the said cam and that end of the transmission rod which co-operates with the cam.
  • the said oscillating lever is pivoted at one end at a substantially fixed point of the machine and is kept in contact at the other end with the cam controlling the oscillation, the end of the said transmission rod being kept in contact in turn with the said oscillating lever, with the possibility of displacement along the same.
  • FIG. 1 is a longitudinal section of the arm of the machine, in the vertical plane of the device according to the invention
  • FIG. 2 is a diagrammatic plan view of the said device
  • FIG. 3a shows in section the knob and eccentric pin for controlling the starting position of the stitching
  • FIG. 3b is a front view of the said knob
  • FIGS. 4a, 4b and 4c are a longitudinal section and a cross-section of the assembly of the knob adjusting the amplitude of the zigzag and a front view of the said knob;
  • FIGS. 5:: and 5b show, partly in section, the control for the engagement and disengagement of the zigzag device, in its two operative positions;
  • FIG. 6 shows a detail of the mounting of the gear with the cam and which is controlled by the gear fixed to the main shaft;
  • the shaft 1 (FIGS. 1, 2) controls in known manner, in the front part 2 of the machine, the vertical movement of the needle bar and the thread take-up lever, and, in the rear part 3, the elements which actuate the shuttle or the rotating hook, according to the type of machine, and the material feeding device, all of which are of known type; mounted on the shaft 1 is the helical gear 4 meshing with the gear 5 with a transmission ratio of 2:1, so that the gear 5 makes one revolution for every two revolutions of the gear 4.
  • the gear 5 is mounted rotatably on the pin or pivot 6 (FIG.
  • the cam 10 of the three-lobed form is integral with the gear 5 and therefore performs one revolution for every two revolutions of the main shaft 1.
  • a pin or pivot 11 parallel to the pin 6 is mounted rotatably in the hole 13 in the wall 14 of the frame arm of the machine; inside the machine, the pin 11 is extended in a pin 12 having its axis eccentric with respect to the axis of the pin 11.
  • the lever arm 15 which bears on the surface of the cam 10 through a convex zone 16 (FIG. 1) shaped with a small radius and parallel to the pin 12.
  • the lever arm 15 performs angular oscillations about the pin 12 (see FIG. 7), passing alternately into the positions 17 and 18, with an angular movement corresponding to the difference between the angle a (FIG. 7a) and the angle B (FIG. 7b).
  • the rod 19 (FIG. 1), which is pivoted at one end to the pendulum 20 carrying the needle bar and oscillating through the medium of the hinge 20', and which keeps its other pointed end 22in contact with the surface 23 of the lever arm 15 through the action of a spring 21, will be subjected to an axial displacement, corresponding to the oscillation of the lever arm 15, in the directions of the arrows 24 (FIG. 1).
  • This displacement or movement is of zero value when the point 22 is at the top, in a position coinciding substantially with the axis of the pin 12 (FIG. 7b), and has a maximum value when the point 22 is located almost in correspondence with the point of contact between the zone 16 and the cam 10 (FIG. 70).
  • the movements of the rod 19 are transferred proportionately to the needle bar, which latter will perform corresponding lateral excursions, with an amplitude from zero to a maximum, for the formation of the zigzag stitch.
  • the shifting of the point 22 of the rod 19 along the surface 23 is controlled by means of the knob 26 (FIGS. 2 and 4a), which is fast with the pin 27 mounted rotata'bly in the bush 27 formed by the wall 14.
  • the arm 28 (FIG. 4b) to which the pivot 29 is fixed eccentrically with respect to the axis of the pin 27.
  • the pivot 29 is one end of the link 30 carrying at the other end the pivot 31 (FIG. 4a) engaging in a hole in the rod 19.
  • the pivot 29 performs an excursion in the vertical direction carrying the link 30, and therefore the rod 19, with it.
  • the screws 28' which are adjustable in suitable seats at the ends of the arm 28, have an arresting function, so that the knob 26 can be made to turn only through a given angle corresponding to the maxi-mum excursion of the point 22, substantially between the axis of the pin 12 and the point of contact between the surface 16 and the cam 10.
  • the end 32 of the rod 19 is pivoted to the pendulum 20 (FIG. 1) at 32 by means of a pin 33 (FIG. 2) provided with an eccentric and which can be clamped by means of the set screw 34; this connection enables the pendulum of the needle bar to be set in the correct position with respect to the cam 10 by simply turning the pin 33 until the needle is centered over the hole in the needle plate and then locking it by means of the set screw 34.
  • the spring 21 holds the point 22 of the rod 19 in contact with the surface 23 of the lever arm 15, while a spring 35 holds the free end of the lever 15 in contact with the cam 10.
  • the lever 36 (FIGURES 5a, b) is provided, this being pivoted on the end 37 of the pin 6 and moreover having a short arm 38 terminating in a flat transverse edge; when the lever 36 is in the righthand position 39 illustrated in FIG. 5a, the lever 15 can oscillate freely, controlled by the cam 10, so as to produce the zigzag stitch.
  • the lever 36 is shifted into the left-hand position indicated in FIG. 5b, the end of the arm 38 is disposed so that the stud 38 fast with the lever 15 bears on the said end so as to hold the lever 15, and more exactly the zone 16, out of engagement with the cam 10. The latter then rotates idly, avoiding unnecessary wear, and the zigzag stitching device remains inoperative.
  • the amplitude of the zigzag can be read on the graduated scale 42 (FIG. 40) on the knob 26 with respect to the fixed index 43.
  • the device according to the present invention which is of extremely simple construction and assembled inside the arm of the machine, and by operating separately or in combination the knobs 25 and 26 and the lever 36, it is possible to obtain with the maximum ease and simplicity, at will and according to the ability of the user, straight stitching on the right, on the left or in the centre; zigzag stitching of an amplitude adjustable from zero to a maximum, with its origin in the centre, on the right or on the left; invisible stitching, buttonholes, various ornamental stitches, embroidery, mending, attachment of buttons and other needlework.
  • a sewing machine for domestic use of the type adapted to produce straight or zigzag stitching and comprising an oscillating pendulum, a needle bar slidably mounted in said oscillating pendulum, a cam for imparting said oscillation, a transmission rod associated at a first end directly with said pendulum, and an oscillating lever cooperating on one side with said cam and on the other side with the second end of said transmission rod for transmitting the oscillation imparted by the cam to the needle bar; the improvement comprising a knob and an eccentric pin fast therewith, the knob being accessible to be operated from outside the machine, said oscillating lever being pivotally mounted on said eccentric pin, the operation of said knob and eccentric pin providing a displacement of the axis of oscillation of said lever in a direction substantially parallel to the direction of action of said cam.
  • Apparatus as claimed in claim 1 and a second knob and an eccentric pin fast therewith, said second knob being accessible to the operator from outside the machine, and means interconnecting said eccentric pin and said transmission rod to shift the transmission rod laterally of the direction of oscillation of the transmission rod and along said lever thereby to change the distance between said second end of the transmission rod and said axis of oscillation of said lever thereby to change the amplitude of reciprocation of said transmission rod.
  • a sewing machine for domestic use of the type adapted to produce straight or zigzag stitching and comprising an oscillating pendulum, a needle bar slidably mounted in said oscillating pendulum, a cam for imparting said oscillation, a transmission rod associated at a first end directly with said pendulum, and an oscillating lever cooperating on one side with said cam and on the other side with the second end of said transmission rod for transmitting the oscillation imparted by the cam to the needle bar; the improvement comprising a knob and an eccentric pin fast therewith, said knob being accessible to the operator from outside the machine, and means interconnecting said eccentric pin and said transmission rod to shift the transmission rod laterally of the direction of the transmission rod and the axis of oscillation of said lever thereby to change the amplitude of reciprocation of said transmission rod.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US618830A 1966-03-01 1967-02-27 Sewing machine for straight or zigzag sewing Expired - Lifetime US3468270A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1504866 1966-03-01

Publications (1)

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US3468270A true US3468270A (en) 1969-09-23

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US618830A Expired - Lifetime US3468270A (en) 1966-03-01 1967-02-27 Sewing machine for straight or zigzag sewing

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US (1) US3468270A (zh)
BE (1) BE694377A (zh)
DE (1) DE1660850A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052947A (en) * 1976-04-05 1977-10-11 The Singer Company Zigzag control device for sewing machines
EP0009107A2 (de) * 1978-09-14 1980-04-02 Dorina Nähmaschinen GmbH Zickzacknähmaschine mit einer Einrichtung zum Herstellen von Ziernähten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757626A (en) * 1951-10-06 1956-08-07 Fujita Kisaku Sewing machine
US3238905A (en) * 1963-06-26 1966-03-08 Mefina Sa Sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757626A (en) * 1951-10-06 1956-08-07 Fujita Kisaku Sewing machine
US3238905A (en) * 1963-06-26 1966-03-08 Mefina Sa Sewing machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052947A (en) * 1976-04-05 1977-10-11 The Singer Company Zigzag control device for sewing machines
EP0009107A2 (de) * 1978-09-14 1980-04-02 Dorina Nähmaschinen GmbH Zickzacknähmaschine mit einer Einrichtung zum Herstellen von Ziernähten
EP0009107A3 (en) * 1978-09-14 1980-06-25 Dorina Nahmaschinen Gmbh Zigzag sewing machine with a device for producing decorative stitches

Also Published As

Publication number Publication date
BE694377A (zh) 1967-07-31
DE1660850A1 (de) 1971-08-05

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