DE2038505A1 - Missing stitch mechanism for sewing machines - Google Patents

Description

PATENT ADVERTISING

DR.E. WIEGAND DIPL-ING. W. NIEAAANN. DR. M. KÖHLER DIPL-ING. C. GERNHARDT

MÖNCHEN HAMBURG

TELEPHONE: 395314 2000 HAMB U RG 50, July 31, 197O

TELEGRAMS: CARPATENT KON IGSTRASSE 28

W. 242Ö1 / 7O VH

The Singer Company , Elizabeth., New Jersey (V.St.A.)

Missing stitch mechanism for sewing machines.

The invention also relates to false aesthetics for sewing machines and in particular on a false stitchery mechanism, which is part of the existing zigzag haiioiasGhineii can be conveniently applied with a minimum of alteration ^, without the area of stitch formation or sewing properties or the allowable range of capability of the sewing machine to which the invention is applied, "Siekzacic stitches perform, somehow affect »

In the German patent application P 16 85 029.6 is sin Missing stitch mechanism for a zigzag sewing machine shown, in which, as in the present invention, the needle swing out mechanism of the sewing machine also works can be used to aurehaufzen malfunctions. With this design, however, the feeling-stitch mechanism is reduced, when he is at work, the width of the Siolrzaek-Stiehe, Polygamy can make the machine *, smablloha As a result is so that the sewing machine has the full Zloksacic stitch work possibility owns a control device in addition to the usual zigzag controls required,

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through which the false stichraechanl sinus can optionally be made effective and ineffective . The invention in an improvement over if the situation in the German patent application P 16 85 029.6 training addition represents than any control other than the conventional zigzag control, accounting for selectively asserting and disabling the Fehlst ichmechanismus, may, without the sewing machine of the full stitch forming assets to rob, they liatoen in the complete absence of missed stitch mechanism would.

In the earlier application P 17 85 24a, 3 a further AusfUhrungsform the stitch formation mechanism for sewing machines is shown, in which the interruption of the needle back and forth is done by a mechanism that is separate and separate from the zigzag mechanism of the sewing machine , while the Pehlstichmechanisinus according to the patent application P 17 85 24o »5 does not affect the sewing possibilities of the sewing machine , this mechanism requires a far more complicated and expensive, the needle bar interrupting mechanism than the device of the invention, which to a large extent the zigzag mechanism the mowing machine for the dual purpose of both the Zickzack.-lah.ens as well as the interruption of the needle s t angenfai n and r -he Bew e g gun for the F eh 1 s 11 c 1 i lib dung from uses "

The aforementioned purposes and before * ti Ht 1I1 11 I 1 flndmip are obtained by providing a median 1 mm In 11 I in r 7. Li Ic ^τ in Ik IJ 'i I uii 0 f. Ι ΐ hi ne t e η ". w η lc h η τ * de ρ 11 ι III η ι1 ν rr I \ 111Ί ι r Aiiiiboliiiiiingbewegung ti Ij ε ι df η III r ι LrI Ii Im ι tv ι ι ι ι II ι Ii wcluht'ift the needle stick ι, I ¹ den - ¹¹¹¹¹ III '

ment al it ät en der Nahm aj 1 it t Ine zur Hi ι 11 ι I 1111 ι nil U Ιιμι

ζ us ajiiiii enarb e 11 en k arm · E1111 f die N11 r 11 ir ι ^r j 1 111111 11111 η and 111 ι movement interrupting VoIM ¹¹¹ I t IjI ι ιiu I 1 υυιρι ι «111 ι tin ¹ I ι lit wi rka am wi rd ,, um das Bi ι reit \ ι > 1 eon e 11 rl ι γ H j Ii I 1111111 11 111 ιι c πι 11

β 1. ηβ r since 1.1 ch en Bew e gi 1111 1 ^r , ni 1 r W nd ρ L h a j ϊ η 1 <11 "I 1 'I 11

area of sewing . lung 111 dt «zigzag needle s tillzus et zen

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SIa further feature of the invention is schabloiis a security, many © in dsm path of reciprocation lter means is disposed on the needle bar ₃₁ wihrend the needle bar is swung positions jeaselts the predetermined range of NMh- · The security template, the needle bar is äasu, in the predetermined B93? eieli of sewing needle Xiingsri in the event that the reciprocating movement of the needle bar should inadvertently fail to interrupt, be effective zn .

An AiasflüiraiigöfOiin aei- invention is shown in connection with the following example: explained with the drawing.

" Pig, 1 shows a diagrammatic Aassieiit des Fehlstioh"

mechanism of invention ^ wslclie only those

Parts of the important mechanisms sine * ⁵ MWMüB.soh! <= ·

■ ne contains u.nci in which the needle bar in äss *

raised missing tichiage is arranged *

2 is a front view of the MäMcopffceiles a iiähmssehine, in which the back and forth "iairsgimg the l'aäelstaagg iiiitsrbrscihiSiiae!" In the direction according to an invention ezl ü; j? S2ig © bya, eht is VMu which reproduces the manner in which the security tss-eliaoloneneinrleiitting 51s !! aäelst & nge for the case afclerfcti, äaS the Kaüelstanp; e should not be unintentionally retained in the raised position »

FIe * 3 is one front view of part of the "lie inland 'uniä movement of ifeGtelstangs witerbrechenden device of FIG. 1 and are you locking device on the needle bar again soft, reclaimed by the way lana motion DER needle bar driving a ~ direction and rait the retaining part is engaged, which holds the needle bar substantially at the upper end of its stroke »

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Pig. Figure 4 is a left side elevational view of the spring-loaded ratchet lever of the needle bar-interrupting device of Figure 5.
Pig 5 is a top plan view of a sewing machine, wherein

part of the top cover plate is removed, it gives the one attached to the machine Missing stitch mechanism of the invention again, where ■. but the sewing machine parts in one

Position for sewing, and W ■ 'Flg. 6 is a cross-sectional view taken along line 6-6

■ of Fig. 5 and gives the parts during the . ■ sewing skipped stitches again ·

The invention can be used in any sewing machine be used, which with a Nadel-Auswlngmechanietmis »'« Η zigzag stitching provided 1st. The attached • Drawings depict the invention as applied to a sewing machine again, as shown in detail in patent application P 16 85 029.6.

As shown in the drawings, the sewing machine has a. Housing which has a machine arm 11, which is provided with a sewing head 12 (FIG. 5). By doing fe Masohlnenarm 1,1 a main drive shaft 13 is mounted, those of. an electric motor (not shown) ". A worm 14 on the main drive shaft 11 meshes with a worm wheel 15 on one Stencil number 16 in the machine arm 11, around a stack 17 of, cough stencils on the stencil shaft l6 to give a drive movement. At the top of the stencil stack 17 there is an exchangeable pattern tray 'blone 18 included, which has a handle 19 that bele exchange of the coughing template detected by the operator ' " can be,·

"" In the Ilhkopf 12 is on a vertical peg _ ;. 'a, needle bar wire 22 loaded for a rocking movement

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Gert (Pig. 2) which reciprocates on a ball bearing 23 for a in its longitudinal axis and is mounted reciprocating needle bar 24 _1, the bottom at its end a needle 25 carries "A second ball bearing 26 is the needle bar 24 in the Bähkopf 12 held so that, in addition to the back and forth movement in the axial direction, the threading eye 24, ζ "Β" for making zigzag stitches, can swing out to the side. In order to give the needle bar 24 a reciprocating movement in its longitudinal axis, the main drive shaft 13 carries a balanced crank 27 which is connected to a needle bar drive link 28 which surrounds a pin f 29 which is on the needle bar 24 by a block 3 ° (Fig. 1) is held, which is provided with cheek parts 31 1st. The block 30 is not attached directly to the needle bar 24, but instead is freely displaceable on it in the longitudinal direction. Above the block 30, a collar or collar 32 is securely fastened to the needle bar 24 by means of an adjusting screw 33. On the collar 32 is pivotably attached by a head screw 3 ^ © In ratchet lever 35, which has an upward pinger 36 and a downward arm 37 «The downward arm 37 i **" * wlo In F5r »3 ^ ns? " Is posed, with a seltlJüiPii IvxlrJ ^r c "^ ^e _ ig ~ i" S se raw, which is below a Ven · ^Λ £ ^ liintrxai'e IS * ^! * · "^^ C""-" * ■ λ can occur, which is formed in the B lekcncpil 3> I des BIc "os Ig, so the block 3 ^» νQd ^ t Bra? ~> L " ^Ί - ~ >> men to define and therefore a Ji äoi Oiicr ^ irac ^ ^-1 * ~ i1 moveable needle bar stubs ^ brvoi ^ indii ζ ' ⁷ ^' - " ⁷ " ¹ "3 * needle bar 24 and the drive arm 2Γ τ MJ. ' ^ n 'ic coil spring 4o, as they xr "» · h ^ d- * -rrtji -; <- -, τ ΛΚ with your ratchet lever 35 and <J m Punft' 1 . Tiinv * "" ^nt presses the. Klinkenf3 r> .g®r 38 ι f τ 'jfüi rn i · - "- ¹ with the locking groove 39 1 t'" lew ~ ielcr ^T j

A from Siech besteiiidtr V'Lni fei * "I" ^ * ¹ " ¹ is by means of the head script .A ■""! Wt - ν Γ inwardly gerlcbtetori thighs in, fi; r cJ * - ¹ Ί _λ ΐΓ ι-_""'^

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des 32 extends, attached to the collar 32. The angle bracket 4l has an inwardly directed abutment stop 43 provided, the in, the path of movement of the ratchet lever 35 ^ is arranged · The puncture of the abutment stop'43 is to prevent the pawl finger from being displaced to a position in which it is the needle bar 24. Overly obvious; The abutment stop 43 prevents since the pawl finger 38 moves beyond a point becomes ,, in which a, beveled, upper edge 44 of the jaw part 31 can come into engagement with the latch finger 38, and it outwards around the jaw part 31 and 'in cooperation can press with .the locking groove 39,

ΙΪ11 the needle bar 24 to stabilize when the block 30 communicates with the blank 32 engages ^1, the collar is provided with a downwardly projecting projection 45 32 which fit snugly between the Baokenteile 31 at block 30 paßt-.

The needle bar 24 is used for zigzag sewing of a zigzag drive link 5o .a lateral Swinging motion granted, which with the needle bar frame 2: 2 pivotally connected, and an integrating plate SI, which on ilm at 52 im. Distance from the needle bar frame 22 and arranged near the stencil stack 17

net is (PIg, 1 and .5). A spring 53, W (IeI:, © in eil πι Maschi

nenarm 11 anchors tist, cli ticks the a nt rl ebs I eiik: e 1: ■ 5 0 and

di · Integrlor plate 51 against the template stack 3I 17 · Two

liner template trailing parts 5Λ and 55 s 1, ncl target, sc hen dei

Integrating plate 51 and the stencil stack 17 are arranged,

and j «the laser beam near subdivision 54 or 55 is j β

wii, le on a trunnion 56 un: 1 57 iη dem 1 1aschl, nenai to 11

versohlebbe "

i · t a, Sohablonenau8wehlneohaniainu8 "from: gea ehen. Pi g 5

1 tif t bftl 60 tin · η Sohab] onenselectionmechani nmua ί ■ el en

front eohablonennachlaufteil, 5 '"Ι · The Soh« blcnenai ι, βι rähJ -

aeehaniMAie 6ο contains & lt ilii, lever system; ! 1111, "rich lEiiuLt: !! ;;" ¹ ii: t iiei:

. etmiift 61 slidable g «lay« i t let, di «luer to the I In saw

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nenarm 11 is arranged and has a. From the operator influenced button 62, which is attached to the free Ana 63 of this lever jsteras. An axial movement of the lever system by pressing the button 62 is used by means of an axial displacement of a lever arm 64 to bring a tail part 65 of the front trailing part 54 into engagement in order to move ilen stencil trailing part 54 out of engagement with the stencil stack If .

A rotary movement of the lever system around the rod 6l is used by means of a link 66 to move the viewing template axis running part 54 along its support pin 56 in the trailing position to a selected sample template on the viewing template shaft 16.

A corresponding template selection mechanism is provided for the rear template trailing part, so that the Hacalaufteile la sensing position for any desired pattern template in the template stack 1? can be arranged, and at least the front stencil trailing part 54 can be arranged in a sensing position for an exchangeable stencil 18 at the upper end of the stencil stack IT «

The Sehablonenstapel 17 waa the exchangeable template 18 Mlden plates or parts * which produce an optional reproduction, each of which has Sehablontrauren on the circumference, the radius of which can change within predetermined limits, and which, if they go through one or the other or through Both trailing parts 5 ^, 55 are filled, serve to swing out the needle bar 24 for making Zi «teaek stitches.

On the stencil shaft l6 below the stencil stack 17 a the Öberstlchbreite controlling lever Jo is hinged on which a beeiaflnSbarer of the operator handle portion 71 is disposed · by the tlberstichbreite controlling lever Jo is, for example dureita a ball head -versehenen 'pin 72, the Drive link 5 © of the Maäelaus-

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swing mechanism pivotally connected. Through this connection With the stitch width control lever 7o, the integrating plate 51 can follow parts relative to the two Noekennachlaufteile 5 ^ and 55 to be shifted laterally. When a handle 71 of the stitch width control lever in the setting is arranged according to a maximum upper stitch width or width of the zigzag sewing as in Pig. 5 is shown, the center line of the pivot connection 52 of the integrating plate 51 is immediately the front trailing part 54 arranged opposite, which any influence of the rear stencil trailing part 55 on the integrating plate 51 extinguishes. In this rack of the sewing machine control the backstitch mechanism according to the invention can be made effective.

According to FIGS. 1, 2 and J>, in which the needle bar mechanism is shown in detail, 8o represents a bearing part which is supported within the sewing head 12, as is customary in this type of sewing machine, in order to carry the adjusting mechanism, such as a (not shown) disc or the like. to adjust the downward spring pressure, which is applied to a "push rod 82, which is slidably mounted in the sewing head 12, and at its lower end carries a conventional" press foot 83. The bearing part 80 can be provided with an inclined abutment surface 84, which to Engaging the upwardly extending finger 56 of the ratchet lever 55 on the upstroke of the needle bar reciprocation, whenever the needle bar 24 is pivoted sideways beyond the lateral position which exceeds its working range for making a stitch may also be formed on a separate plate which is attached to the bearing member 80 or directly on the sewing machine body. Referring to Pig "is 1, can be seen that the presser 83 with an inner elongate opening 86 for the piercing of the needle

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is provided. This presser foot needle opening 86 corresponds Usually in the width of a needle opening, not shown, which is formed in a throat plate 87, on which the work piece is carried on the sewing machine. The needle openings are wide enough to allow you to test over-the-air width for dl «sideways · swing-out movement to compensate, which dl · needle in alignment old the Ability of the stiohin "dreaming activities in order to derive" 1ηββ Can perform Stiches. Palis di needle bar 24 around a greater distance is pivoted to the side, ils through the presser foot opening 86 is provided, the needle | hit the presser foot 83, of course, and it would damage to the parts. If the expression However, "lateral swinging movement beyond an area in which stitches can be made" is used in the present specification, but is not intended to be used thereby only limits are included, which by the width dimension of the needle opening in the presser foot or in the Throat plate are forced on, but it should continue " any limitations in the ability of the needle and looper to work together to make stitches are to be embraced. The abutment surface 84 is on the bearing part 80 arranged in such a way that the fin- eng 36 engages and moves the ratchet lever 35, I. so as to release the pawl finger 38 from the locking groove 39 whenever, for some reason, the needle bar 24 is pivoted beyond this point, in which it is possible to make stitches. Since the abutment surface 84 is arranged on the left side of the collar 31 'as can be seen when looking at FIGS. 1, 2 and 3, it is it can be seen that a release of the ratchet lever 35 only then is made when the needle bar 24 in a Riohtung is pivoted to move the needle 25 to the right, as shown in FIGS. It is natural it is evident that the abutment surface 84 on the opposite

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BATHROOM CRIGlMAL ■ ·

- Io -

lying side · of the needle bar 24 can be arranged and so that the ratchet lever 35 can be reversed to release the needle bar 24 when it is swung out beyond the stitch image area in the opposite direction will.

In order to influence the separation of the · drive ·· for the back and forth movement of the needlef · 2% su, tin Fehlst lohe A special, a Reproduction generating part or plate preferably in the Font of a pattern stencil on the top of the stencil staple 17 instead of being inserted in the ituster stencil, weloh · only able to make the pattern of zigzag stitches influence. Such a coughing template for skipped stitches Is shown at 9o in Figures 1, 5 and 6, and it is identified by urafangaso template surfaces 91, which are marked with a radius smaller than the smallest radius portions of any of the zigzag templates in the stack 17 "Ind. The skip stitch template 9o is still included Circumferential points 92 are provided, which are arranged on a radius that is as large as that of the template sensing parts of the Zlokaaok master template in the Ziokzaok template template stack! 17 is. With the handle controlling the stitch width 71 in the position of the maximum stitch width postponed 1st, as shown in Flg. 5 shown 1st, and a Missing stencil 9o arranged on the stack of stencils with the leading trailing portion 54 selected to dl «defective wage union 90, move parts 91 the missing stiohso template 90, which have smaller radial dimensions than the smallest radius of any of the zigzag templates, the needle bar 24 over the position area in which it is possible to make stitches and strike with the subsequent upward movement of the needle 25 the near above finger 36 of the ratchet lever 35 on the abutment surface 64 and separates the connection between the drive arm 28 and the needle bar 24.

^108818/1213 BADOR ₁ G ₁ NAL

liiiil in mil ¹ IjI ¹ IiI

An elastic stop insert loo is in the to-and-fro movement path by a screw lol on the sewing head 12 attached to the needle bar 24 so as to prevent the needle bar 24 from being uncontrollably upward flies when the drive connection with her during the fast working of the sewing machine is interrupted.

For example, by a fixing screw 111 is fixed to the bearing member 8o, which controls the printer, a mounting support member Ho fixed "An inwardly directed shoulder portion of the holder supporting member Ho is disposed in the path of movement of the latch finger 58 of the ratchet lever 55 when the μ ratchet lever 55 except for working engagement with the Jaw parts 51 of the block 3> o is pressed, as shown in FIG. In this way, by engaging the ratchet lever 35, the shoulder portion 112 holds the needle bar 24 in the raised position while the block J) O- slides downward relative to the needle bar 54. Dependent on the shoulder part 112 of the holding bearing part Ho and located in the path of movement of the ratchet finger 58 of the ratchet lever 55, an inclined viewing template arm part of the holding bearing part Ho, which, as shown in FIG 2) in the event that the holding shoulder part 112 of the I bearing part Ho should accidentally suspend holding the needle bar 24 in the raised position during a skipped stitch. Preferably, the inclined Sehablohenarm II5 of the holding bearing part Ho should be set very precisely so as to push the needle bar 24 sufficiently far to prevent the needle from hitting the edge of the presser foot or against the workpiece carrier of the sewing machine, and for this purpose a Abutment pin Ϊ14 be provided, which is screwed into the inclined part of the template arm H 5 of the support bearing part Ho and can come into engagement with the sewing head 12. The wi- '

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derlagerz & afen Il4 is provided with a cutout II5, which can be set in such a way that it positions the support bearing part Ho very precisely in relation to the sewing head 12.

It can be seen that the abutment surface 84 and the holding bearing part Ho different than by the presser foot regulating bearing part 80 can be supported, for example they can be supported with the sewing head part 12 of the sewing machine housing be directly connected. Because they / are supported on the bearing part 80, the abutment surface 84 and the support bearing part Ho on it as a sub-structure be provided, whereby the manufacture of the sewing machine is facilitated.

In Fig. 1, a knitted material 12o is shown, on which long stitches are applied by using the skip stitch template 80 as shown in FIGS. 1, 5 and β is used. This skip stitch template is 9o with two diametrically opposed circumferential parts 92 for the template trailing with a large diameter provided, and each part is only with the template trailing part during one arm shaft revolution of the sewing machine In engagement. All other peripheral parts 9I for the stencil follow-up of the Fehlstiohschempel 9o have a smaller one Diameter and influence the skipped stitch operation, so that with a normal drive speed of 24 stitches with each revolution of the template shaft 16, the skipped stitch template 9 ° causes the needle bar 24 to and the floating mechanism participates in eleven cycles of movement with the needle bar 24 required for each cycle of movement is engaged with the needle bar 24 operatively connected and excessively long stitches as shown in FIG is to be produced. If the stitch length of the usual Nihmasehinen work piece feed, for example is set to approximately 3.2 mm (1/8 ") per stitch, the stitches shown in FIG. 1 become approximately J55 mm (about 1 3/8 ") spaced from each other. Such stitches can be used as tack stitches.

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Use of Pehlstich templates 9o can be used, for example, to produce conventional zigzag stitches during part of a rotation of the stencil shaft and make skipped stitches during another part of this revolution so as to be spaced apart Create groups of zigzag stitches.

Furthermore, the invention does not apply to the use of a pattern template for generating a swinging movement a needle beyond the range in which stitches can be made and during which the skipped stitches are provided. Any desired control for making an abnormal sideways swing can for example be used as a hand-operated instrumentality through which skipped stitches can be formed as desired simply by making the needle bar an abnormal swing out position.

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Claims (1)

Claims. ΙΔ skipped stitch mechanism for sewing machines with an actuating mechanism carried by a housing, with a needle bar carried by the housing for reciprocating movement in a longitudinal axis and for lateral swinging movement for producing zigzag stitches, a device on a sewing machine which has a predetermined range from the side pivoted positions of the needle bar, in which stitches can be formed, defines a device driven by the actuating mechanism to give the needle bar reciprocating movements in its longitudinal axis, and a mechanism driven by the actuating mechanism to move the rod carrying the needle in to impart lateral swing-out movements to the predetermined range of lateral swing-out positions, characterized by a device (90) for influencing the lateral swing-out movement of the needle bar (24) beyond the predetermined range of lateral swing-up divisions and dur ch an interruption device (36, 34, 84) by which the means (27-29) which gives the needle bar reciprocating movements, is made effective only during lateral swinging movement of the needle beyond this predetermined range. 2, missing pin mechanism according to claim 1, characterized in that that the mechanism (5o, 51) that the needle bar (24) within a predetermined range in which stitches can be formed, given a lateral swinging motion, through a selectable, a response generating part (template 17, 18) can be influenced is, and that the device for influencing the lateral swinging movement of the needle bar (24) beyond the predetermined range has a different, a response generating part (9o), which in the mechanism (50, 71), that of the needle bar 24 or the needle 25 has a lateral 109818/1213 Swinging motion granted, is 'replaceable' instead of a response generating part (17, 18) for the predetermined Range of lateral swing positions. 3 · Missing stitch mechanism according to claim 2, characterized in that that the response generating part to give the needle a lateral swinging motion, a rotatable pattern template (17> 18), which has a circumferential sensing path, the radius of which is within Changed predetermined limits, and that the device for influencing the lateral swinging movement of the needle bar (24) beyond the predetermined range contains a rotatable pattern template (90) which has a Circumferential sensing path (91, 92), with parts (91) being formed with a radius which is smaller than the "predetermined Limits of a pattern template for making stitches is. 4. skipped stitch mechanism according to claim 1, characterized in that the needle bar (24) through the mechanism (50, 51), which gives the needle bar (24) a lateral swing-out movement, can only be driven in one direction is that a device (53) the needle bar (24) in the opposite direction pushes the interruption device (36,;? 4, 84) an interlocking locking device (55 * 36) on the one carrying the needle Rod and on the device (27-39) that gives the needle bar reciprocating movements, an abutment (84), the assigned to the sewing machine housing and arranged for contact with the locking device to a Locking this device only during a lateral swinging movement of the needle bar beyond the predetermined To effect area in the opposite direction, and that a safety cam device (115) carried by the sewing machine housing and in the back and movement path of the parts is arranged on the needle bar (24) when the needle bar (24) is in the opposite direction 109818/1213 set .Direction is pivoted beyond the predetermined range of lateral swing-out positions in order to press the needle face against the force and in the predetermined range: -. \. - th- μ chraechani smus according to claim k, characterized gekenr ^ i .. -f!. that the Sicherheitsnoekeneinriehtung (.1.1.J)) a ^ ⁿ '- i ovpiit (112) is arranged adjacent and with the Υ-rrLfc ~ « ^J longitudinal device (35 ₁ 36) on the needle bar (24) cooperates in order to hold the needle bar (24) back when" it is interrupted "essentially at the upper end of the path of movement of the needle bar (2k). Blank page