DE1660885A1 - Changeable drive for the needle bar of a sewing machine - Google Patents

Description

Variable drive for the needle bar of a sewing machine.

The invention relates to a variable drive for the needle bar a sewing machine with an anti-bamechanlsmuB, the a compensating crank attached to the upper wire, a Includes pin and a shaft attached to this balance crank, which moves in accordance with the rotational movement of these Can turn the compensating crank, also a Hadelstangenechwinge, which is hinged at one end to this shaft ”and a needle bar, which with the other end of this h. dolotangenschwlnge connected by a bar clamp and back and forth is held proceeding by a needle bar carrier, with one end of this Badelstangenschwlnge a rotary movement is issued when οich turns this compensating crank, whereby this needle bar is given a reciprocating motion and

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one attached to the lower end of this needle bar! can perform a sewing operation.

It is known that in a zigzag stitching machine an increased amplitude or an increased deflection of the needle bar provided with a needle results in a wider zigzag stitch or a wider zigzag seam. The needle bar provided with an I needle executes a vertical movement, and it is necessary that the shuttle shuttle or the rotating hook catches the thread loop formed next to the needle, ^v when the needle penetrates the fabric to be sewn, rises again and a certain height goes through, but of course there is some limitation to the zigzag movement of the badel with regard to catching the loop of arrows by the gripper.

If one also assumes that the handle is in a vertical direction moves at a constant speed while the gripper rotates at a constant speed, so there is only one movement (a certain point) at which the desired condition occurs, namely that the Uadel is calibrated

and hit the gripper or the gripper shuttle. aside from that prevents an increased aaplitude of the needle oscillation, i.e. an increased distance «wipe the left and right

BATHROOM OBIGlNAL

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lowered position of the needle, inevitably the desired condition for the hook and the hook to meet. If ssan want Imchen so the Badelschwingung further bsw, starter, so called a "broader Zicksack-Saw gets _t it goes without saying that there is a certain limitation vorbanden.

IJRA such a restriction for the thread catcher "bmi. Ausauschalten the Einfengen the thread loop, prepare various proposals have been _g made limit the rotational movement of the gripper or the vertical movement of Eadeletange eh, thereby siehergestellt that meet the JiSadel and the gripper, or crawl so that one obtains a movement with increased width of the zigzag saw.

The structure of these YorsefalSgen is bz ^. the arrangement pretty complicated, and manufacture and assembly become difficult and expensive, while movement becomes less smooth will. Thus, these proposals are not useful for sewing machines that operate at high speed.

The invention aims to provide these IJacli parts of the known sewing machines bu booeiti ^ en \ mü also a gickzag-HäbmBcMiie, in which the Itedenechlings by the gripper ship

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ohen or the gripper can be caught reliably and operationally safe, even if the amplitude of the rod oscillation is increased »so that aaan has a very good looking zigzag seam of great width.

In accordance with the invention this is done with a variable drive mechanism for the needle bar reached duroh a rocker or coupling with a first pin on one side and a second peg on the other side, this first peg rotatable with one end of this rod wing connected and the second pin in a bass hole is inserted rotatably, which protrudes in this compensating crank and on one side of this compensating crank End is formed; further by a fork-shaped member which is attached to this protruding end of this second pin is attached, by an eccentric cam with the same width, which is fixedly arranged on the machine frame 1st and with ) this fork-shaped CrIled can engage, wherein this squat, which is eccentric with the same width, has its shortest radius with respect to the machine frame is that the needle and the gripper can meet when the bath thong is caught by the gripper, and as a result, a change in the movement of this

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limbs caused by the rotary movement of this compensating crank, this change in movement on this first pin on this rocker as well as the speed of the ascending movement of this with the first pin. connected can be limited and changed.

First and foremost, it provides a relatively simple mechanism for changing the speed of the Sadelstang® of a sewing machine.Even if the deflection of the needle oscillation is increased considerably, the appropriate condition for the Badel and the (! Mature to meet) can be exactly upright are erbalten, whereby a reliable capture of the Eadenschlinge and, accordingly, the exact preparation of a good-looking, wider Siekzaekflaht is ensured. Zn this end is inserted to the driven by the rotation of the main shaft balancing crank, the connecting shaft of the rocker or coupling loosely referred to with for A fork-shaped link is attached to this connecting shaft and an eccentric cam of the same width attached to the machine frame or an eccentric cam of the same width is inserted into the fork part of this fork-shaped link nt. In this way, the connection between the wheel rod swing arm and the through

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The rotation of the compensating crank-driven rocker has the effect of this cam, which is eccentric with the same width. As a result, the movement of the rod swing arm Needle bar moved in the vertical direction at any point in time with respect to speed can be changed and by adapting this point of the speed change with the position in which the The needle and the hook can meet a smooth and even Catching the loop of arrows carried out and the Badel oscillation increased for zigzag IT sewing «In addition the structure is extremely simple, with only an eccentric crouch with the same width and a fork-shaped one Link are newly added · Manufacture and assembly are also easy to carry out, as is a wide one Zigzag Baht is produced with practically no increase in cost can be.

) It also creates a smooth and evenly working mechanism for changing the speed. · Usually? A rotating mechanism is preferably used in a sewing machine, and this ensures effective use of inertia as well as smooth operation at high speed. In the present invention, the rotation of the compensating crank is accurate as

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same as that of a conventional eksohine. Even if a fork-shaped engaging member is used, eo this member moves as a single body together with this Compensating crank, and even if an eccentric squat of equal width is used, this squat is attached to the machine frame, and this fork-shaped link performs a simple harmonic movement as it rotates around this squat. This catfish is good Transmission limits the acceleration of movement without increasing the to-and-fro hatred. That's why there is also no increased vibration, no noise is generated, and there is practically no wear, as a result of which very easy movement is ensured for a long period of operation.

An example embodiment of the present invention is explained below with reference to the drawing in which

Fig. 1 shows a front view of the variable drive according to the invention for the needle bar of a sewing machine.

Pig. 2 is a side view of the mechanism according to the invention; with some parts shown in section and the front frame omitted.

Pig. 3 is an exploded perspective view View of the main parts of the mechanism according to the invention.

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Pig. Fig. 4 is a diagram for explaining the action of the mechanism.

Pig, 5 shows a diagram of the linear or sleeve movement the needle bar equipped according to the invention and the previous needle bar with regard to catching a loop of arrows,

The machine frame 50 carries a known mechanism for The vertical movement of the needle bar In the embodiment shown, this mechanism exists for the vertical Movement of the needle bar from an upper shaft 4 »the horizontal between the bushing 9 of the upper shaft, which is in the bearing 51 is inserted, which is attached to a section of this frame 50 Eats seen in the gate, and another, arranged in the rear rope of this web 50 casually (not shown) rotatably mounted is, from a compensating crank 5, which is attached to one end of this upper shaft 4, from a liadelstangenechwinge 71 by means of a rocker or coupling 6 with one end this compensating crank 5 and at the other end with the needle bar 10 is connected by a bath pole clamp 8, which is articulated at this end of the bar link 7. This bathing rod 10 is supported by the carrier sections 11, 11 of the MadelstangentrSgers 15 held slidably, whose upper end is held pivotably by a pivot 14 on the front hand of this web 50. When this top wave

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4 through a suitable movement. Mechanism is set in rotation ₉ so it rotates this Ausgleietiskiirbel 5 »which in turn the B & delete & Bge 10 filier ä ± ®B® swing _{arm 6 B} the needle bar swing arm? and £ ia fe & eXsteiigsakMsEier δ '© ine back and forth motion given Xu δ®? Middle ££ © g © s laäelsta ^ gentrigers 13 is an end eisse Sshwisgst & bes 15 © agelealri? (16), which differs from a resident MseesEisEss; is KsssM

Generation one 8 Aiss® € * 2, ags © i? £ ' ^c ö3? 3efct _£ wg & ® £ (£, £ © £ © 2? 15 this IfodelßtsngeiitsiSges? 15 ®ia £ Islisi ^ pisg e choosing the Siadelstang © IG äwsoh äiseaic Iswegeagss back and & © rg © fülirt is w © "öei ice vcee ifeäc ^ ^ stes ÄstsSgcs held wää dsdurea © sie in Äme®MMg S £ ol £ ea0l- ^ iii © s © Eiasugt is · Adjacent au.diese MMBglQMWImsb ^ l 5 is ® £ e © Wipp © 12 with its lower file on the sapfcss € 1 disess? S © Mitugt β ^ erechwenfebar. Aofiesäea is iu des?! Sitt® of this rocker 12, as shown in Fig. 1 ₉ the head part @imea Eetltebtlgele 17 articulated, the lower file of which is attached to the seat ^r i2 d @ ig l ^, @ ohinen ~ frame 50 so that it can be swiveled, the rocker 12 is used to feed the upper loaded two needle 20 " which is attached to the lower end of the Sadeletango 10, and for tightening the stitch or the Hj & ht * which is formed by the interaction of the needle 20 and the gripper or the shuttle (not shown).

According to the invention, the known® structure is now provided with the following axes. The socket 9 of the upper ¥ © 11 © , which is connected to a

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Plausch 21 is provided for a secure fit of this socket in the bearing 51 * is extended so that it forms an eccentric, roughly triangular squat 1 with the same width in one piece j which is attached to this bearing 51 of the machine frame 50 in the Ifeise that - as indicated in Fig. 4 - the shortest Badius of this eccentric Uockens 1, among other things, the Dreliwinkel 200 ° of the upper while 4 to. comes to lie during the. Angle of rotation 0 ° of the upper shaft 4 corresponds to the upper iDotpunkt of this needle bar 10 «The pin 6Δ, iex is attached to the rocker arm or coupling 6, is inserted rotatably in a bore 22 on a Ufetdabschnitt this compensating crank 5, and it extends to the Projection on the back of this compensating crank 5A fork-shaped member 2 with the Saßbohrung 5 at its lower end is placed on this elongated projection and fastened by a screw 3 'This fork-shaped member 2 is arranged in such a way that it receives the approximately triangular ifocken 1 .

As a rule, dea corresponds to? Bücehwinkel of 200 ^{ö of} the upper shaft 4 is usually that time when a favorable condition exists for the Badel and the gripper to meet or cross each other, especially when the Hadel is in the; lowered basic position of the Zickßaek hat bo-

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finds, whereby this position is here on the left side. According to the invention, of course, the phase of the with the same Width eccentric skirts can be changed, so that they a different £ rabbit on a given sewing machine adapted is "self" running the shortest Badius this hot eccentric, roughly triangular ITocking of the same width the angle of rotation of 200 ° of this upper shaft 4 to lie comes, the sinfangen '& r thread loop through the Shuttle or the gripper at the left-lowering position the needle never adversely affects, I'M accordingly the most favorable condition for catching the bathing afterlings in the right »ab & ea & fcen position of the evil can guarantee, according to the invention · the shortest radius this triangular crouching within the area of about 100 to 200 ° of the rotation angle of the upper shaft can be arranged ·.

of course this may equal width eccentric about dreieickige squatting 1 by any other means be moved, insofar as it is useful for the intended purpose, but it squatting eccentric 1 must, of whatever kind 'he is .also _# fulfill this purpose in an effective manner .

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A rotation of this upper shaft 4 lets this compensating crank 5 move the connecting pin 6Δ about this upper shaft 4 on the path Κ, as indicated in Pig, 4, and then the Badelstangensehwinge 7, which is attached to the lower end of this rocker 6 by means of the connecting pin 6B connected iot _{9 is moved} on a certain path, whereby the reel rod 10 executes a reciprocating movement. At the same time, the egg bar 10 is subjected to an oscillating movement that is caused by

Ψ the vibrating rod 15 is caused. In this way a good zigzag Haht is obtained with a suitable ReIatiyzustand the Fadel and the gripper by the Ü & denschlinge is captured by the catcher in an exact manner "Sas snocken by the AuBgieichskurbel 5 around the lireiec ^ 1 rotated e _s fork-shaped member 2 is while dee dreaens this crouching is subjected to a suitable oscillating movement, which rotates the pin 6Δ in the bass bore 22 of the compensating crank 5 "and thus a suitable displacement of the sitting angle cujr

) Swing arm 6 with regard to the equalizing bucket 5 »where, the Swing at the end of this peg 6A with a counter-clocked pin Rotation on the fork-shaped. Link 2 attached. Such a one Winkelvex-flchiebuntf this Gchwinga 6 välurend do3 drive condition! the mower results in a control loop at the Upward movement of the tfaaelotangenscliwin & e 7, and oio lifts "Lie overhead servant Sadclf taugenaohwingo 7"

BATH ORIGINAL

whereby the back and forth of the speed changed a wider Zieksaek · maintains, in te port or both

10 regarding

, t aaa soIMt ί ^ festig® condition meet-

D * Kelehnet, w © b <si

di © middle of the BsSfeoteBSi

oa & the middle of the Hapf @ n® 6B ₀ dsB? @fe, ä, @ a uns dto®g® ffi @ il der

Sistoisg® β TOSfoEssata is * with sit ^ ©! © te? 3fe @ it © @ 3si @ stri ~ Squat. 1, '"d @ r" as cte © 1ϊ <ι®? @ & ¥ @ lle _/ 4 in the above c © g © © © aes3, lie ie © "fe @ f © stlgt ₉ folgas ^ s relationship is established will «Whom <ä @ r S ^ © te ^ iafe @ l £ of the upper .. wave 4 is 200 ^e , gi @ kd £ @ with So O _{2 is} still at the same distance as before, or in other words, the The center O ₂ lies on the circular path h of the pin 6A while the upper shaft 4 rotates from the point with the angle θ equal to 200 ° to that with the angle G equal to 220 °, the center O _{1 of} the pin 6a shifts from O ₁ (a) to O ₁ (b), and the center O ₂ takes the position of Og (b) as indicated by the solid line in Pig * 4, but when the invented gate direction is not used, it moves di © middle O ₂ to O ₂ (b ¹ ) »as in a

conventional t ^ eohine the lall is. According to the invention, however, the swinging movement of this © ta, toe ieokigan sock 1 is transmitted to this peg 6A while it rotates around this roughly triangular crouch, ie the © swing arm 6 in © © by the angle ' ψ the center O ^ (b) shifted, ys & tm. the upper shaft 4 is rotated SSMA angle 2DD ° back "In this way, limited di © ismgekehrte! rotation of the rocker 6, the increase or · Hachob @ Ngeh © n the Sadelstängensch & total 7 to zn some € R XAD _v as strength in £. Is indicated 4 by d @ n angle ψ, Imae as a result of the AufwSrtsbewegung changing the needle bar 10, as indicated by the solid line in Pig x 5 · The Srehwinkel Φ of the rocker arm 6 can, of course, by varying the stroke length L of the eccentric cam 1 can be chosen arbitrarily, and accordingly the decrease in the displacement of the bathing rod at the right, lowered position of the needle in FIG. 5 can be set arbitrarily. In Pig x 5, the dashed line shows the current movement of the needle bar Compared with the extended line, which is, for example, the movement of a erfindungsgemäS armed needle bar "in the illustrated embodiment is located, as aue 5 hervorgetit that ISadel in the left, lowered at the to <fLfrom their lower dead center m

, BAD'ORlQiNAU.

when the shop loop is conveniently caught by the gripper "This favorable condition, namely that the sieve, the thread and the gripper meet * is generally achieved by a conventional HaiimsehinsnmechaMsmus, since, in the conventional. Mechanism that rotates the upper shaft to 180 ° when the needle reaches the lower dead point, UBd in which the upper ¥ elle rotates to 200 ° "so the needle is raised by this distance <fjt from the lower dead point, and with this assignment the 3 "aJä @ äsehlingö caught by the gripper. TJm, however, as explained above, the movement of the needle bar by the distance Ah within the range of 200 ^{ms 220 s of} the angle of the upper ¥ elle SU, the forwards movement of the bath! from the bottom dead center as the distance 4h.-to dom.Äatand #E Tom distance ο RO be reduced «Biese- 'te ^ iügerjing fier Auf \? ärtsbe ^ 0guag the Hadelste-ags will of course lie« - ^ firkt, if <ii «Lladel on the right side of the Ab--

sealcs feel development is, sehaffen to a favorable condition dafiSr S5U that the Sadel and the gripping it hit _s and ümdensehXirige is thus ready by the gripper einge- ^J begin to be · In the x © way, "ill the iiadel it

far ν -

prevented j from passing nibes the gripper, "run the latter rna catch the ssd noose. '

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In this way, the performance according to the invention enables a wider zigzag E-sewing with higher quality and Uniformity · It also makes things much easier Mechanism which is easy to manufacture at a low cost, using only a conventional mechanism anit an eccentric one with the same width, about triangular squat 1 is additionally provided on the upper shaft is formed »as well as with a socket a 9 and one fork-shaped member 2, which is attached to the pin 6A of the rocker arm 6 is attached. The eccentric due to this with the same width, The movement produced by a triangular squat is a simple harmonic movement with a limited acceleration, and there is no increased reciprocating mass * The transmission is accordingly excellent, the! lifetime, the rome industrial point of view Most importantly, it is ensured that no noise is made and that it is only minor Abrasion of the I-parts, so that an extremely long service life is guaranteed.

The device according to the invention can also be used in a mower used for straight mowing. It compensates for a certain error in the relative movement setting

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the! censure and the gripper completely and ensures a reliable capture of the three? adenschlinge, whereby the occurrence of sogenannton "Stitch ⁿ jump -Phänoniens off.

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Claims (1)

Claims A variable drive for the needle bar of a sewing machine having a drive mechanism comprising a compensating crank attached to the upper turning shaft, a pin and a shaft attached to this compensating crank which can rotate in accordance with the rotational movement of this compensating crank; Furthermore, a needle bar, which is articulated at one end to this shaft, and a needle bar, which is connected to the other end of this needle bar by a needle bar clamp and held back and forth by a needle bar carrier, with one end of this needle bar being given a rotary movement when this compensating crank rotates, as a result of which this needle bar is given a back and forth movement _} and a needle attached to the lower end of this needle bar can carry out an operation, characterized by a rocker (6) with a first pin (6B) on one side and a second pin (6A) on the other side, this first pin (6B) rotatably connected to one end of this rod link arm (7) and the second pin (6A) being inserted rotatably into a fitting bore (22) which is inserted in this compensating crank (5) and is formed at an end protruding on one side of this compensating crank; BATH- 209831/0099 1880885 further by a fork-shaped member (2) which is attached to this protruding end of this second pin (61). If, through an eccentric link (1) of the same width, which is fixedly arranged on the casehole eye (50) and can engage with this fork-shaped member (2), this link with the same width is eccentric (1) its shortest radius with respect to the machine frame ä is arranged so that the needle (20) and the gripper can meet when the thread sole is caught by the gripper, thereby causing a change in movement of the latter. Engaging members caused by the rotary movement of this compensating crank (5), this change in movement is transferred to this first pin (6B) on this rocker (6) and the speed of the ascending movement of this Eadelstangenschwinge (7) connected to the first pin (6B) is limited and changed can, 2 * variable drive according to claim 1, characterized in that that a vibrating rod (15) with one end with the Hadelstangen- ' carrier (15) and with the other end with a swinging movement generating mechanism is connected, so that the needle bar (10) a swinging movement and a zigzag Mowing can perform while doing this with the same width eccentric Uodsn (1) is arranged such that its shortest distance with regard to the Xfeschinenrahmens' (50) so 20 9831/009 9 _{ft & 0} 0 ^ ^#l 1860885 is set so for the Eadel either in the right lowered position or in the left © n lowered position a favorable condition is created * if the Siadel (20) and the gripper meet, meet or cross each other, whereby the thread loop is provided for from Claw to be caught. ■ 5 · Variable drive according to claim 1 or 2 _8, characterized in that this fork-shaped member (2) engages with this cam (1) which is eccentric with the same width, while this cam (1) which is eccentric with the same width is in one piece with a Bushing (9) for the upper shaft (4) is arranged, which is inserted into a bearing part of this machine frame (50), this bushing (9) receiving and holding this upper shaft (4) rotatably in the horizontal direction. 4. Variable drive according to claim 3, characterized _f that this eccentric crouch (1) is an approximately triangular cam with the same width. BATH ORIGINAL 209831/0099 Blank page