EP0109946B1 - Zig-zag sewing machine - Google Patents

Zig-zag sewing machine Download PDF

Info

Publication number
EP0109946B1
EP0109946B1 EP19830850278 EP83850278A EP0109946B1 EP 0109946 B1 EP0109946 B1 EP 0109946B1 EP 19830850278 EP19830850278 EP 19830850278 EP 83850278 A EP83850278 A EP 83850278A EP 0109946 B1 EP0109946 B1 EP 0109946B1
Authority
EP
European Patent Office
Prior art keywords
zig
zag
connecting rod
needle
needle bar
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
Application number
EP19830850278
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0109946A3 (en
EP0109946A2 (en
Inventor
Kenneth Oscar Emanuel Skogward
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Publication of EP0109946A2 publication Critical patent/EP0109946A2/en
Publication of EP0109946A3 publication Critical patent/EP0109946A3/en
Application granted granted Critical
Publication of EP0109946B1 publication Critical patent/EP0109946B1/en
Expired 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

Definitions

  • the present invention relates to domestic sewing machines, in particular to the zig-zag mechanism of such a machine.
  • the needle bar performs a vertical movement and a horizontal movement of which the latter is controlled by a guiding means which keeps the bar in an adjusted position during the downward movement of the needle which is effected by a crank and a connecting rod.
  • a torque on the needle bar created by the resistance in the needle movement can be so great that the needle is laterally moved from the adjusted position, whereby the needle is broken.
  • the guiding means has a rather limited force of keeping of the adjusted position and therefore it is important to make an arrangement having a very small torque on the needle bar when moving the needle.
  • the upper arm of the invention has a crank shaft perpendicular to the zig-zag movement of the needle.
  • the problem forming the basis of the invention is how to achieve a simple propulsion on the needle bar when the crank shaft is positioned in this way including links and connecting means so that the guiding means of the zig-zag movement will not be disturbed by the driving force of the needle bar.
  • a solution of the problem can be based on a positioning of the connection between the connecting rod and the needle bar at a point which approximately coincides with the fulcrum of the zig-zag movement in the moment when the needle penetrates the cloth.
  • Such a device is presented in the German Patent Publication DE-OS 26 10 275.
  • a similar solution introduced into a sewing machine according to the invention is stated in the characterizing clause of Claim 1.
  • FIG. 1 a sketch of a needle bar mechanism with a top journalled needle bar
  • Fig. 2 a sketch of a mechanism with a center journalled needle bar
  • Fig. 3 a sketch of a mechanism with an oval-shaped movement path of the connecting rod
  • Fig. 4 the same mechanism as in Fig. 3 in another position
  • Fig. 5 a perspective view of such a mechanism.
  • the sewing machine referred to is provided with a hollow body having an upper arm, in the end of which there is a horizontal pin 10 and a needle bar frame 11 journalled thereon to be swingable in a direction perpendicular to the feeding direction of the machine.
  • the adjustment of the frame, the zig-zag position, is effected by a guiding means 12 shown in a block in Figs. 1-4.
  • a connecting rod 13 is connected at a point 14 to a needle bar 15 journalled in the frame.
  • a crank shaft 16 is journalled in the body perpendicular to the zig-zag direction, its crank pin 17 is connected to the connecting rod, and a force is transferred from the crank shaft to the needle bar via the connecting rod when the needle hits the material.
  • the mechanism in Figs. 3 and 4 involves an improvement according to the invention.
  • the propulsion of the connecting rod is here effected by means of a link system creating an oval movement 19.
  • the system consists of a pin 20 disposed in the body and a link 21 journalled thereon and a crank arm 22 carrying a crank pin 17.
  • An arm 23 connects the crank pin to two bearings 24, 25 of the link and the connecting rod, respectively.
  • L 1 is here very small which brings a slight influence of the force in the connecting rod on the guiding means 12. This means can therefore be dimensioned for a much less keeping force of the position than what is the case in the device according to Fig. 1.
  • the pin 20 may be provided with an adjustable attachment so it may be raised or lowered in the body, thereby allowing an adjustment of the needle level in a simple way.
  • Fig. 5 the mechanism is shown as a module in a plate frame 28 which either can constitute a part of the upper arm of the machine or be an independent part which is mounted in the arm.
  • An arm 29 is provided on the crank pin 17 and has a pin 30 which carries a bearing of a sliding block 31 on a rod 32 which is fastened to a thread take-up lever 33 journalled on a shaft 34 in the module frame.
  • the end of the arm has a thread guide 35 which in the usual way takes up the upper thread during a phase of the stitch forming procedure.
  • the arm is driven by the crank shaft in a vertical, oscillating movement; when the crank pin moves in its circular path the sliding block 31 slides up and down on the rod 32 swinging the same to and fro and the arm is following in the oscillating movement.
  • the adjusting force for the zig-zag movement can be reduced in a device according to Fig. 4.
  • the zig-zag movement is effected by a step motor 36 and a gear and link system connected thereto.
  • a pinion 37 is in mesh with a rack 38 which in one end has an angular recess 39.
  • the rack carries a pin 40 which is entered in an extension 41 of the needle bar frame which thereby follows the movement of the rack.
  • the pin is normally kept in the bottom of the angular recess thanks to the two sloping edges 44, 45 thereof and to a couple of compression springs 42,43 which on the opposite side of the rack are fastened to the frame.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP19830850278 1982-11-22 1983-10-21 Zig-zag sewing machine Expired EP0109946B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8206645 1982-11-22
SE8206645A SE448475B (sv) 1982-11-22 1982-11-22 Sicksackmekanism i symaskin

Publications (3)

Publication Number Publication Date
EP0109946A2 EP0109946A2 (en) 1984-05-30
EP0109946A3 EP0109946A3 (en) 1984-07-04
EP0109946B1 true EP0109946B1 (en) 1987-11-25

Family

ID=20348698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830850278 Expired EP0109946B1 (en) 1982-11-22 1983-10-21 Zig-zag sewing machine

Country Status (5)

Country Link
EP (1) EP0109946B1 (ja)
JP (1) JPS59105488A (ja)
AU (1) AU568822B2 (ja)
DE (1) DE3374701D1 (ja)
SE (1) SE448475B (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451147B (sv) * 1985-10-23 1987-09-07 Husqvarna Ab Drivanordning i symaskin

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH293995A (de) * 1950-07-17 1953-10-31 Aktiengesellscha Duerkoppwerke Nadelstangenschmiervorrichtung an einer Nähmaschine, z.B. einer schnellaufenden Industrienähmaschine.
US3450081A (en) * 1968-03-05 1969-06-17 Jacob Rabinow Safety needle device for sewing machine
DE2610275A1 (de) * 1976-03-11 1977-09-22 Koennyueipari Gepgyarto Vallal Stichgruppennaehmaschine
MC1159A1 (fr) * 1977-02-02 1978-04-17 T Arvai Perfectionnements au mecanisme de commande du mouvement rectiligne alternatif de la barre a aiguille d'une machine a coudre
US4108096A (en) * 1977-05-16 1978-08-22 The Singer Company Needle bar drive stabilizing arrangement
IT1122608B (it) * 1979-07-18 1986-04-23 Rockwell Rimoldi Spa Dispositivo di azionamento dell'ago di una macchina per cucire

Also Published As

Publication number Publication date
SE8206645L (sv) 1984-05-23
JPS59105488A (ja) 1984-06-18
AU2110183A (en) 1984-05-31
SE448475B (sv) 1987-02-23
JPS643513B2 (ja) 1989-01-20
DE3374701D1 (de) 1988-01-07
EP0109946A3 (en) 1984-07-04
AU568822B2 (en) 1988-01-14
SE8206645D0 (sv) 1982-11-22
EP0109946A2 (en) 1984-05-30

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