US2322523A - Cross-stitch sewing machine - Google Patents

Description

June 22, 1943.

A. KIERNER CROSS-STITCH sEwIN MACHINE Filed May 30, 1942 3 Sheets-Sheet l INVENTOR. Awe, 7fleme1;

ATTORNEY.

June 22, 1943. A, WERNER 2,322,523

CROSS-STITCH SEWING MACHINE Filed May 30, 1942 3 Sheets-Sheet 2 INVENTOR.

ATTORNEY.

June 22, 1943. A. KIERNER CROSS-STITCH SEWING MACHINE Filed May 30, 1942 5 Sheets-Sheet 5 INVENTOR. z'eflzezj Azzll'an BY ATTORNEY.

Patented June 22, 1943 s PATENT OFFIQE.

onoss-srrroH SEWlNG MACHINE Anton Kierner, Union, N. J., assignor to Emil Prazak, Elizabeth, N. J.

Application May30, 1942",v seriaiNo. 445,166 Cla'iins. (01. 112-93) This invention relates to improvements in sewing machines; andthe'invention has reference, more particularly, to novel sewing -machine mechanism for producing and applying cross- Stitching to goods for decorative and other'purposes.

'The invention has for an object to provide in a sewing machine, a novel multiple needle stitch forming mechanism including means to oscillatingly rotate the reciprocable needle-bar about its longitudinal axis in timed relation to .the'

stitch forming operations of the mechanism, whereby to apply, to the goods operated upon, a plurality of stitch formations in mutually crossed relation for decorative or other purposes.

The invention has for another object to provide novel needle-bar rotating means including actuating cam means driven from the power shaft of the sewing machine; wherein said lca'm means may be provided in various forms adapt ed, selectively, to produce either, continuously running or uninterruptedly connected "crossstitches, or one or more cross stitch formations alternated with straight run stitch formations,

whereby various cross-stitch designs may be pro- U duced as desired.

Other objects of this invention, not at this time more particularly enumerated, will beiunderstood from the following detailed description of the same.

Illustrative embodiments of this invention are shown in the accompanying drawings, in 'which Fig. l is, a side elevation of a sewing machine embodying the present invention,' parts being broken away to show underlying mechanism; Fig. 2 is a top plan view of the needle-bar rotating means and its actuating cam means in one position; and Fig.- 3 is a similar top plan view showing the needle-bar rotating means and its actuating, cam means in another position.

,Figs. 4, 5 and 6 are respectively plan views of goodsha'ving applied cross stitching and showing various positions of, the needles carried by the needle bar as moved to effect the crossinggof, the stitch formations.

:Fig. 7 is a detail view of needle-bar rotating cam formed to so control the needle-bar rotativeoscillation as .to produce double cross stitch formations alternated with straight run stitch formations; and Fig. 8. is a plan view of goods having applied alternated cross stitch and straight run stitch formations produced by the mechanism'including the cam a modified form of acter H indicates a sewing machine head supported by a base l2. Mounted in the head II is the usual presser foot l3 and the vertically .reciprocable needle-bar M; the latter carrying at least a pair of laterally spaced needles l5-I6. Journaled to extend through the head II is the power or drive shaft ll of the machine, the same being driven by the pulley [8. On the forward end of said shaft I1 is fixed a crank wheel i9 connected with a knuckle 20 on the needle bar ments to said needle bar and its needles.

I4 by a link or connecting rod 2|, whereby to impart operative vertical reciprocable move- Supported on the head II are thread tensioning devices 22, through which are led threads a and b from suitably disposed sources of supply. From said tensioning devices the threads a and b are led. through the eye 23 at the upper free end of theneedle bar I4, to extend thence through the eyesof aguide bracket 24, suitably disposed and affixed to the forward face of the head ll, said threads passing thence to the respective needles l5, and I6, through the eyes of which theyare respectively threaded. Beneath the base 12, and suitably disposed and driven in the usual manner, is a looper. means 25 to cooperate with the sewing needles for stitch forming operations; the stitches produced being of the chain stitch type. A sewing machine of the above described shown), comprises a construction well known to r the art, and provides the basic structure in connection with which the improvements, according tothe'principles and purposes of the present invention, are provided.

To operate the needle bar and its needles whereby to cause the produced stitch formations to cross each other in a cross stitch relation, the needle bar I4 is so arranged that it is capable of rotative movements about itslongitudinal axis aswell as of vertical reciprocation, and to this drive shaft ll of the machine.

upper end of said cam shaft 40 is a cam wheel 43 4 h end is rotatably related to the knuckle 20, but is retained against axial or longitudinal movement relative to the latter by collars 26-2l affixed to the needle bar so as to respectively abut the upper and lower ends of said knuckle 2!). It will thus be obvious that the vertical reciprocation of the knuckle 20, produced by the crank wheel l9 and link or connecting rod 2!, will be transmitted to the needle bar while nevertheless leaving the latter free for rotative movements about its longitudinal axis.

Means are provided for producing rotative' movements of the needle bar, of-des'ired degree (usually of an amplitude approximating 130 def,

grees), first in one direction and then in the] other; each such movement being properly controlled and timed so as to occur while the nee'--- I dles I5ii5 are raised out of the work 0 being operated upon, and above or free of the presser foot l3; The means for thus oscillatingly rotating the needle bar comprises an oscillator frame having a hub sleeve 3i! pivotallysupported on an upstanding fulcrum post 3i which is affixed'to the top of the head i l, in laterally offset or spaced away relation to the upper free'end portion of the needle bar M, which projects exteriorly from and above said head. AffiXe-d to said hub sleeve 3!! are upper and lower hori- " zontal frame plates 32 and 33, the same being vertically spaced apart for a distance somewhat in excess of the limits of the vertical reciprocable movement of the needle bar. Said frame plates are each provided with suitably shaped interior openings 34 through which the needle bar extends; these openings being so sized as to permit the frame plates to unimpededly oscillate or swing relative to the needle bar. Connected to and between the free end portions of said frame jplates 32-33 is a vertical thrust bar 35. Af-

fixed to said needle barintermediate the frame plates 32-33 is a lever arm 36 having a bifurcate free end portion adapted to straddle and operatively engage with said thrust bar 35. One

of said frame plates, preferably'the lower frame plate 33, is providedwith an outwardly projecting tail-piece or lever lug- 31.

Aflixed to'the rear end of the head II is a bracket member 38 which carries a laterally off:

set perpendicular bearing portion 39. Journaled i in said bearing portion 39 is a cam shaft 40, upon which is fixed a worm gear 4! adapted to mesh with and be driven by a worm 42 on the power. or Affixed to the having a cam race to engage and actuate means for transmitting operating motion to the heretofore described oscillator frame, in suchmanner, however, as to properly time and relate such motion to the operative reciprocations-of the needle bar. The transmission means thus actuated by the cam wheel comprises a link bar 44 which is pivotally connected with the free end of a fulcruming bar 45, theopposite end of the latter bee ing pivotally supported by and connected with a fixed supporting bracket 46 suitably located and attached to the head H. .The rearward end of said link bar 44 is provided with a roller stud ,4! to operatively engage in the cam race of the cam wheel 43. The forward end of said link bar 44 is pivotally coupled with the tail-piece or lever lug 37 of the oscillator frame. 7

The race of the cam wheel 43 may be variously designed and formed according to the arran ge-.

ment of cross stitch formations desired to be produced. In a simple form thereof, as shown more particularly in Figs, 2 and 3 (the cam wheel 43 being rotated in a clockwise direction), the same comprises a cam section 5!] for moving the link bar 44 forwardly, to swing the oscillator frame in one direction whereby to rotate the needle bar clockwise, a following concentric dwell section 5! to hold the needle bar in the resultant position, a second cam section 52 for moving the link bar 44 rearwardly, to swing the oscillator frame in the opposite direction whereby to rotate the needle bar anti-clockwise, and a following or second, dwell section 53 to hold the needle bar in position resulting from such movement, said dwell section 53 leading back to the first cam section 50, and thus completing the operative circuit of the cam race.

In the operation of the machine, when the lat erally spaced needles l5 and H; (which, for stitch completing operation, are normallydisposed on a line transverse to the path of movement of the work 0 through the machine) have been positioned with the needle 15 at the right and the needle H5 at the left (see Fig. 4) by a previously effected swing of the oscillator frame in anticlockwise direction, such swing being produced by the traverse of the cam section 50 of the cam dwell section 5| of the cam race, whereby the linkbar 4.4 and oscillator frame are held stationary, so as to retain said needles I5 and 16 in the aforesaid relative positions (see Fig. 2). While the needles are held in said positions,'the work c having in the meantime been fed forward by the machine work feed means, the'needle bar reciprocating means causes the needles to descend and enter through the workC, So that the looper hooks :1; and y (which are respectively arranged with their hook sides'inward for proper en agement and manipulation of the needle borne threads at and b) respectively engage said threads a. and b to form stitch loeking chain loops in the well known manner, whereupon the downward movement of the needle bar I 4 is reversed so that the needles l5 and iii are raised outgof the'work c and free of the presser foot 13. By the time the needles clear the presser foot l3, the dwell section 51 0f the cam race completes its traverse of the link bar roller stud 41, so that the latter is thereupon engaged and traversed by the second cam section 52 of the cam race, during which time the needle bar completes its upward movement and again starts downward on its operative stroke, and also during which time the work 0 is fed forward to initiate a cross stitch formation. The engagement of the stud roller 41 by said secand cam section 52 operates to retract the link bar 44, and thereby causes the oscillator frame to swing in clockwisedirection (see'Fig. 3). Such clockwise movement of the oscillator frame is transmitted byits thrust bar 35 through the lever arm 36 to the needle bar I4, thereby rotatingthe latter in clockwise direction, and thus revolving the needles l5 and [6 approximately 18.0 degrees. so as to reverse the position of said needles to dispose the needle [6 at the right and the needle l5 at the left (see Figs. 5.and. 6).. Such revoluti of the needles, while the work 0. is advanced by the feed means of the machine, causes the threads a andb to cross each other. After the eed es a e hus qs ti d t e e nd am s tipn 52 having completed its traverse of the link complete one cross-stitch formation and initiate a succeeding cross-stitch formation. The above described operations are continuously repeated during-the operation of the machine, so that continuously following and connected cross-stitch formations are successively produced. In the illustrative form of cam wheel above described and as shown in Figs. 2 and 3, two such crossstitch formations are produced during each revolution of the cam wheel 43.

As previously hereinabove intimated the race of the cam wheel 43 may be shaped to produce other than continuously following and connected cross-stitch formations. Illustrative examples of modified cam race forms are shown in Figs. 7 and 9, and it will be understood that many other modified forms may be utilized.

In the cam wheel 43 shown in Fig. '7, the cam race is designed so that, in operation, it will control and time the movements of the oscillator frame relative to needle bar reciprocation whereby to produce, two successive cross-stitch formations ab in alternation with straight stitch formations s (see Fig. 8). To this end, as also indicated by the legends applied in Fig. '7, the cam race is divided into groups of succeeding seci tions, comprising a cam section TF for turning the needle bar and its needles in one direction, a dwell section EL to hold the needle bar and its needles against turning While entering and leaving the goods, (making one cross-stitch formation), a cam section TF for turning the needle bar and its needles in the opposite direction, a dwell section EL to again hold the needle bar and its needles against turning while entering .and leaving the goods (making the second crossstitch formation), a continuing dwell section S to continue to hold the needle bar and its needles against turning while the goods are fed and straight stitches are formed, and another dwell section EL to hold the needle bar and its needles against turning while entering and leaving the goods, whereby to complete the straight stitches and initiate a succeeding cross-stitch formation.

It will be obvious that by providing the cam race with dwell sections EL, S, EL between the cam sections TF and TF, instead of an EL section only, the stitches produced will comprise single cross-stitch formations alternated with straight stitch formations.

In Fig. 9 is shown another modified form of cam wheel 43 wherein the cam race is designed to control and time the movements of the oscillator frame so as to produce a plurality of successive cross-stitch formations ab, e. g., four, in alternation with straight stitch formations 3 (see Fig. 10). To this end the cam race is divided into groups of succeeding sections 'IF, EL, TF, EL, TF, EL, TF, EL, S, and EL respectively functioning in the same manner as the correspondingly identified sections in Fig. 7, with the result, in operation, of continuously producing four successive cross-stitch formations followed by a straight stitch formation as shown in Fig. 10.

From the above description it will be understood that the machine will function in a simple and efficient manner to form and apply to the surface of goods worked upon desirably arranged cross-stitch formations for decorative or other purposes. The stitch forming mechanism has been illustratively shown and described as of stitch locking formation.

the type producing a chain stitch, but it will be obvious that the sewing mechanism may be modified to produce any other well known type of Many changes other than those already mentioned maybe made in the above described .construction, and widely different em-bodiments'of this invention could be made without departing from the scope thereof as defined by the appended claims. It is therefore intended that all matter contained in the above description and shown in the accompanying drawings shall be interreted as illustrative and not in a limiting sense.

I claim:

1. In a sewing machine for producing crossstitch formations, a stitch forming mechanism including a reciprocable needle bar carrying laterally spaced needles respectively supplied with individual threads, said needle bar bein capable of rotative movement in addition to its reciprocable motion, a pivoted oscillator means carrying a thrust bar disposed parallel to the needle bar, said needle bar having a laterally projecting lever arm engaged by said oscillator means thrust bar, whereby the latter imparts rotative movements to said needle bar so as to alternately transpose its needles prior to stitch completing operations of said needles, and means for actuating said oscillator means in timed relation to reciprocable movements of said needle bar, said latter means including a driven control cam.

2. In a sewing machine for producing crossstitch formations, a stitch forming mechanism including a reciprocable needle bar carrying laterally spaced needles respectively supplied with individual threads, said needle bar being capable of rotative movement in addition to its reciprocable motion, a pivoted oscillator means carrying a thrust bar disposed parallel to the needle bar, said needle bar having a laterally projecting lever arm formed to slidingly embrace said thrust bar, a driven cam wheel having a cam race, and a link bar coupled to said oscillator means and having a stud engaged by said cam race, said cam wheel being adapted to transmit, through said link bar, back and forth swinging movements to said oscillator means for transmission by its thrust bar to said needle bar lever arm, whereby to correspondingly rotate said needle bar to transpose its needles with thread crossing effect prior to given stitch completing operations thereof.

3. In a sewing machine for producin crossstitch formations as defined in claim 2, wherein the cam wheel race is so shaped as to swing the oscillator means and thereby rotatively oscillate the needle bar in such manner and timed rela tion to selected reciprocable movements thereof as to produce one or more cross-stitch formations alternated with straight stitch formations.

at. In a sewing machine for producing crossstitch formations, a stitch forming mechanism including a reciprocable needle bar carrying laterally spaced needles respectively supplied with individual threads, said needle bar being capable of rotative movement in addition to its reciprocable motion, a pivoted oscillator means carrying a thrust bar disposed parallel to the needle bar, said needle bar having a laterally projecting lever arm formed to slidingly embrace said thrust bar, a driven cam wheel having a cam race, a link bar, a pivoted fulcruming bar to which said link bar is pivotally connected, the forward end of said link bar being pivotally coupled to said oscillator means, the rearward end of said link bar having a stud engaged by said cam race, said cam wheel being adapted to transmit, through said link bar, back and forth swinging movements to said oscillator means for transmission by its thrust bar to said needle bar lever arm, whereby to correspondingly rotate said needle bar to transpose its needles with thread crossing efiect prior to given stitch completing operations thereof.

5. In a sewing machine for producing crossstitch formations as defined in claim 4, wherein the cam Wheel race is so shaped as to swing the oscillator means and thereby rotatively oscillate the needle bar in such manner and timed relation to selected reciprocable movements thereof as to produce one or more cross-stitch formations alternated with straight stitch formations.

' ANTON KIERNER.

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