US1961270A - Cross thread laying mechanism - Google Patents

Description

June 5, 1934.

J. P. WEIS ET AL 1,961,270 CROSS THREAD LAYING MECHANISM Filed Oct. 16, 1930 4 Sheets-Sheet l INVENTOR.

10/21: 7? Net's.

By Alba; WGt S- ATTORAEYS.

June 5, 1934. J p was r AL 1,961,270

CROSS THREAD LAYING MECHANISM Filed Oct. 16, 1930 4 Sheets-Sheet 3 INVENTQR. 70/277 7. WQtS- By Alb rt fin/eas- ATTORNEYS.

June 5, 1934. J, was ET AL 1,961,270

CROSS THREAD LAYING MECHANISM Filed Oct. 16, 1950 4 Sheets-Sheet 4 INVEN TOR. John P WGLS. By Al rt H Weds.

ATTO NEYS.

Patented June 5 1934 UNITED STATES PATENT GFFIC CROSS THREAD LAYING MECHANISM John P. Weis and Albert H. Weis, Nyack, N. Y.,

assignors to Metropolitan Sewing Machine Corporation, Nyack, N. Y., a corporation of Delaware This invention relates to sewing machines and more particularly to an improved cross stitch laying mechanism therefor, by means of which ornamental stitching on the top surface of the work is obtained, and which improvement is applicable to different kinds of sewing machines, such as long and short arm, and also to cylinder sewing machines manufactured by the Wellknown Metropolitan Sewing Machine Corporation.

The primary object of the invention is the provision of a cross thread laying mechanism, by means of which perfect stitching of delicate threads, yarns, rayon, floss or silk of different sizes and with several threads is obtained when the machine is running at speed, especially when a heavy covering is desired with a long stitch, thereby insuring rapid production.

A further object of the invention is the provision of a cross thread laying mechanism, simple in construction and accurately operative and which will lay the thread or threads close to and directly on the material being stitched, requiring no thread take-up and which will work with two or more needles of either wide or narrow gauge or spacing, which is not possible with other similar devices now in use, and which obviates the necessity of a movable thread guide since the cross thread in the present improvement is conducted directly from the supply to a tension and thence to a stationary guide where the cross thread carrier or hook picks up and drops the thread loops in the path of the needles, by means of which the thread is stitched to the top of the work.

As the present improvement, simple in con struction, efficient in use and inexpensive to manufacture, is applicable as stated, to various kinds of sewing machines, only a brief description of such machines is deemed necessary herein to make clear the construction and operation of the present improvement, since it is applicable to any multiple needle sewing machine.

In the drawings accompanying and forming a part of this specification, Figure 1 is an end view of a top and bottom rotary shaft Metropolitan sewing machine having this improved cross stitch laying mechanism applied thereto.

Figure 2 is a top view of the cross stitch laying mechanism, the top of the sewing machine being illustrated in dotted lines.

Figure 3 is a side View of the mechanism shown in Figure 2.

Figure 4 is a perspective view illustrating in dotted lines a Metropolitan cylinder sewing machine having this improved cross stitch laying mechanism applied thereto.

Figure 5 illustrates a part of the thread carrier.

Figure 6 illustrates the thread carrier lever mounted on the presser bar.

Figure '7 illustrates partly in section, the assemblage of driving crank and crank shaft and one of its bearings.

Figure 8 illustrates a cross stitch made with a two-needle machine having one looper, the looper thread producing an ornamental stitch on the bottom of the work also.

Figure 9 illustrates a cross stitch madewith a two-needle machine having two loopers with two rows of stitches on the bottom of the Work and the cross stitch on top thereof.

Figure 10 illustrates this improved cross stitch laying mechanism applied to a short arm, flat bed sewing machine, the cross stitch laying mechanism being shown in full lines and the sewing machine illustrated in dotted lines.

Similar characters of reference indicate corresponding parts in the several views.

Before explaining in detail the present improvement and mode of operation thereof, we desire to have it understood that the invention is not limited to the details of construction and arrangement of parts which are illustrated in the accompanying drawings, since the invention is capable of other embodiments, and that the phraseology which we employ is for the purpose of description and not of limitation.

In the machine illustrated in Figures 1 to 3, 5, 6 and 7, the base 1 has the usual trunk 2, top arm 3 and head 4, in which is located the needle bar 5 and presser foot bar 6. The machine has feeding mechanism '7 and looper mechanism 8 operated by a bottom rotary shaft 9 connected by connecting rods,. not shown, with the top rotary shaft 10 for transmitting motion to the latter for operating the needle bar 5 and cross stitch laying mechanism.

The presser bar 6 has the usual presser foot 11 to co-operate with the feed dog 12 for feeding the work, and the needle bar has needles 13 coacting with loopers 14 for making the stitches 15 (Figure 9). Operating across and in front of the needles is a thread carrying hook 17 for laying the cross stitch 16 (Figure 9). This hook has a rounded free end 18 (see Figure 5) provided with a downwardly slanting, backwardly extending thread engaging loop forming hook 19 located at the under side of the end of this member and in position to pass over and pick up the cross thread 20 at 21, (Figure 2) where this cross thread extends from the stationary guide 22 directly to the stitches being made at the presser foot opening 23. This guide 22 is stationary with relation to the presser foot or presser foot bar, but being carried thereby, it of course moves up and down therewith during the feeding movement thereof to accommodate different thicknesses of goods.

The cross thread loops are cast on the work 24 instantly as the hook reverses its motion when the needle threads 25 tightly draw down on the work to secure these cross threads in place.

The thread carrier 17 has a shank 26 clamped at 27 to the arm 28 of an oscillating right angle or bell crank lever 29 moving freely on the presser bar 6 (see Figures 1 to 6), and which bar is provided with a groove 30 for the reception of the end 31 of a screw 32 having a lock nut 33, whereby the screw is maintained in place for controlling the lever 29. The arm 34 of the.

lever 29 receives a screw ball stud 35 (see Figure 1) for one end of a connector 36, the opposite end of which, 38, is connected by a screw ball stud 37 with the thread carrier operating means. By this means, the thread carrier can oscillate on the bar 6 and move up and down therewith.

The thread laying mechanism shown in Figure 4 is similar to that just described in connection with Figure 1.

This cross stitch laying means is operated from ie needle drive shaft 10, (shown as a top rotary shaft in Figures 1, 2 and 3, and. as a transverse rotary shaft in Figure 4) by a crank 39 (Figures 2, 3 and 4) and connection 40, the opposite end Y of which (Figures 1, 2 and 3) is coupled as at 41 to the free end 42 of a lever 43 secured at 4.4 to a shaft 45, which may be of solid form, as shown in Figures 2 and 3. In Figure 4, the connector 48 attached to the crank 39 of the transverse shaft 10 is, in turn, connected as at 41 to the end. 42 of a lever 43 attached as at 44 to a tubular shaft 45.

This shaft 45, in Figures 1 and 2, operates in supporting bearings 46 and 47, while in Figure 4, this shaft is tubular and is supported by "the needle operating shaft 48 which rocks in bearings 49 and 50 and is operatedfrom the transverse shaft 10 by a connection 51 and crank arm 52 connected to the needle operating shaft 48, the opposite end of which is coupled by a lever 53 to the needle bar 5.

Secured to the shaft 45 (Figures 1 to 4) as at 54 is an arm 55. carrying at itslower end the screw ball stud 37 hereinbefore referred to, and by means of this driving mechanism from the top rotary shaft 10. (Figures 1 to 3) or the transverse rotary shaft 10 (Figure 4), the cross stitch laying means is operated and which is applicable to dilferent types of machines with little, if any, change in the parts thereof, by merely selecting the necessary connections, levers, shafts and bearings whereby the improvement may be used with a variety of machines now in use and thus easily converted in an economical manner and without the return of the machines to the manufacturer.

This improved mechanism being easy to adjust and thread, does not easily get out of repair and will stitch accurately at high speed even' when making stitches at twenty-five to thirty per inch, which is due to the inverted hook of the thread carrier.

In Figure 8, at 15a, a, twin needle stitch made with a thread carrying looper coacting with a pair of needles is shown and, in Figures 1' to 3,

the improvement is applied to a Metropolitan long arm, flat bed rotary top and bottom shaft machine while, in Figure 4, the improvement is applied to a Metropolitan cylinder machine and, in Figure 10, it is applied to a Metropolitan short arm needle lever type flat bed machine, in which it will be seen that movement for the cross stitch laying finger 17 is obtained from the shaft 9 having a gear 56 in mesh with another gear 57 secured to a shaft 58 mounted in suitable bearings of the trunk 2 of the machine frame, a collar 59 on this shaft 58 preventing end play of the shaft.

The gear 57 is provided with a hole located ofi center in which the ball stud 60 is seciued and coupled to a bearing 61 of a rod 62 which, in turn, is coupled as at 63 to a ball stud 64 carried by an arm 65 of a rocker lever or tubular shaft 66 pivoted at 67 on the needle lever stud 68, the nut 69 of which limits end movement of the lever on the stud. The upright or vertical arm 70 of the lever 66 carries a ball stud 71 connected as at 73 to a rod 72 which, in turn, is connected as at 74 to a ball stud 75 ofa lever 76 secured at 77 to a bar 78 having means for guiding the presser bar 6 and preventing it from turning in its bearings, and for which purpose, the presser bar 6 has clamped thereto a collar 78' having a stem 79 terminating in a yoked bearing 80 carrying the guide bar 78 which is thus permitted to rock in this yoked bearing while having an up and down movement with the presser bar 6.

The lower end of this bar 78 is clamped as at 81 to a yoked lever 82 having a segmental gear 83 in mesh with a similar gear 84 of the lever 29 for giving movement to the finger 17. The usual presser spring 85, with its end 86 resting on the stem 79 gives pressure to the presser foot in the usual way, andthe usual presser foot lifting means is provided, not shown.

Thus. this mechanism just described constitutes r the means for operating the cross stitch laying finger 17. It will be observed that in all forms, the operating means for the oscillating cross finger or thread carrier, includes a vertically supported member connected to the thread carrier or finger by a single connection, thus very much simplifying the connection between. the cross finger and its operating means and permitting motion to be directly transmitted to the oscillating finger or thread carrier, thereby doing away with various linkage, joints or pivots which would cause excessive overthrow as the speedof the machine varies from minimum to maximum each time the machine is started. It requires almost micrometer precision to lay a stitch accurately as is now demanded especially as the machine is operated at a speed of 3,000 R. P. M. or over, and any variation either from underthrow or overthrow of the parts during the operation of the machine, which would be the result of multiple linkage, would cause a variation of the stitch formation. Moreover, the necessity for repairs is not only diminished but a number of. parts eliminated by this single connection.

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

' Having thus explained the nature of our said j I bar, the combination of stitching mechanism including a plurality of needles and cross stitch laying mechanism operative to form and lay loops of a cross thread directly on the material being stitched without the use of a thread take-up or movable thread guide and comprising a shiftable thread carrier having its axis of movement coinciding with the axis of the presser foot bar, and means for operating it and including avertically supported member and a single connecting member between said shiftable thread carrier and said vertically supported member in combination with a guide stationary relative to said presser foot bar but movable therewith for the thread leading from the thread supply, said guide being so located that the thread carrier will pick up and drop the thread loops in the path of the needles, whereby the cross loops are stitched to the top of the Work.

2. In a sewing machine having a presser foot bar, the combination of stitching mechanism including a plurality of needles and cross stitch laying mechanism operative to form and lay loops of a cross thread directly on the material being stitched without the use of a thread take-up or movable thread guide and comprising a shiftable thread carrier pivotally mounted on the presser foot bar, and means for operating it and including a vertically supported member and a single 7 connecting member between said shiftable thread carrier and said vertically supported member in combination with a guide stationary relative to said presser foot bar but movable therewith for the thread leading from the thread supply, said guide being so located that the thread carrier will pick up and drop the thread loops in the path of the needles, whereby the cross loops are stitched to the top of the work.

3. In a sewing machine, the combination of stitching mechanism including a plurality of needles and cross stitch laying mechanism operative to form and lay loops of a cross thread directly on the material being stitched without the use of a thread take-up or movable thread guide and comprising a shiftable thread carrier and means for operating it in combination with a stationary guide for the thread leading from the thread supply, said guide being so located that the thread carrier will pick up and drop the thread loops in the path of the needles, whereby the cross loops are stitched to the top of the work, said thread carrier comprising a member having an inverted hook having a rounded free end and a downwardly extending backwardly slanting loop forming hook.

4. In a sewing machine, the combination of stitching mechanism including a plurality of needles and cross stitch laying mechanism operative to form and lay loops of a cross thread directly on the material being stitched Without the use of a thread take-up or movable thread guide and comprising a shiftable thread carrier and means for operating it in combination with a stationary guide for the thread leading from the 5 thread supply, said guide being so located that presser foot and its bar, of an oscillating thread carrier carried by the presser foot bar for laying a cross stitch and having its axis of movement coinciding with the axis of the bar, means for operating said thread carrier, and a stationary thread guide carried by the presser foot and so located in position that the thread carrier will engage the thread between it and the stitch mechanism.

6. In a sewing machine, the combination of stitching mechanism including needle mecha nism, a presser foot and its bar, an oscillating thread carrier, a thread guide stationary relative to said presser foot bar but movable therewith located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guide to the stitch forming means, and means for oscillating said thread carrier and including means connected to the main driving shaft of the machine comprising a lever system including a rock shaft, crank mechanism, gear mechanism, a vertically supported. member connected with the rock shaft and a single connecting member between said oscillating thread carrier and said vertically supported member.

'7. In a sewing machine, the combination of stitching mechanism including needle mechanism, an oscillating thread carrier, a stationary thread guide located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guide to the stitch forming means, and means for oscillating said thread carrier and including means connected to the main driving shaft of the machine comprising a lever system including a rock shaft, crank mechanism and gear mechanism, said cross thread carrier having an inverted hook at its end.

8. In a sewing machine, the combination of stitching mechanism including needle mechanism, an oscillating thread carrier, a stationary thread guide located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guide to the stitch forming means, and means for oscillating said thread carrier and including means connected to the main driving shaft of the machine comprising a lever system including a rock shaft, crank mechanism and gear mechanism, said cross thread carrier having an inverted hook at its end formed by a downwardly extending backwardly slanting hook forming portion.

9. In a sewing machine having needle mechanism and presser foot mechanism, and means for operating the needle mechanism, said presser foot mechanism including a presser foot constructed for the passage of the needles therethrough, an oscillating thread carrier located above the presser foot and having an inverted hook formed end, means for oscillating said thread carrier, a stationary thread guide located adjacent to the presser foot for guiding the thread to the needle opening in the presser foot whereby the thread carrier is in position to pass over the thread and engage said thread, the thread carrier and stationary guide being located adjacent to the presser foot and one carried thereby.

10. In a sewing machine having needle mechaism and a presser foot and its bar, and means for operating the needle mechanism, an oscillating thread carrier located above the presser foot and having an inverted hook formed end, means for oscillating said thread carrier, a stationary thread guide located adjacent to the presser foot for guiding the thread to the needle opening in the presser foot whereby the thread carrier is in position to pass over the thread and engage said thread, the thread carrier and stationary guide being located adjacent to the presser foot, one carried thereby and the other by the presser foot bar.

11. In a sewing machine, the combination of stitching mechanism including a plurality of needles and means for operating them, presser foot mechanism including a presser foot and a supporting bar therefor, a stationary guide carried by the presser foot, a cross thread carrier supported for oscillating movement by the presser foot bar and having an inverted hook at its end, and means for oscillating said carrier onthe bar whereby it is operative in position to pass over the thread guided by the stationary guide and lay the thread in loops on the work to be stitched down by the needles.

12. In a sewing machine having an overhanging arm, the combination of stitching mechanism including needle mechanism and a needle operating shaft located in the overhanging arm, a presser foot and its bar, an oscillating thread carrier, a thread guide stationary relative to said presser foot bar but movable therewith located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guide to the stitch forming means, and means connected with the needle operating shaft for oscillating said thread carrier and including a vertically supported member and a single connection between said oscillating thread carrier and the vertically supported member.

13. In a sewing machine having. an overhanging arm, the combination of stitching mechanism including needle mechanism and a needle operating shaft located in the overhanging arm, a presser foot and its bar, an oscillating thread carrier, a thread guide stationary relative to said presser foot bar but movable therewith located in position whereby the thread carrier will pass over and pick up the thread where it extends from saidguide to the stitch, forming means, and means for oscillating said thread carrier and including a lever system and a shaft extending transversely of the overhanging arm and with which said lever system is connected and also including a vertically supported member and a single connection between said oscillating thread carrier andthe vertically supported member,

14. Ina sewing, machine having an overhanging arm, the combination of stitching mechanism including needle mechanism and a needle operating shaft located in the overhanging arm, a presser foot and its bar, an oscillating thread carrier, a thread guide stationary relative to said presser foot bar but movable therewith located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guideto the stitch forming means, and means for oscillating said thread carrier and comprising a lever system, a rock shaft connected therewith and with the needle operating shaft and including a vertically supported member and a single connection between said oscillating thread carrier and the vertically supported member.

15. In a sewing machine, the combination of a presser foot bar, stitching mechanism, a single oscillatory thread carrier, a thread guide cooperating therewith and located in position whereby the thread carrier will pass over and pick up the thread where it extends from said guide to the stitch forming means, means for oscillating said thread carrier and comprising a rock shaft, and means connected with the rock shaftfor operating it and including a vertically supported member and a single connecting member between said shiftable thread carrier and said vertically supported member, the thread carrier having its pivotal axiscoincident with that of the presser foot bar and the threadguide being stationary relative to the thread carrier but movable with the presser foot bar.

JOHN P. WEIS. ALBERT H. WEIS.

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