US2063995A - Ornamented loop-stitch sewing machine - Google Patents

Description

Dec. 15, 1936.

ORNAMENTAL LOOP STITCH SEWING MACHINE J. GALKIN Filed Jan.

24, 1936 3 Sheets-Sheet 1 ATTORNEY Dec. 15, 1936. J. GALKIN ORNAMENTAL LOOP STITCH SEWING MACHINE Filed Jan. 24, 1956 3 Sheets-Sheet 2 JOSEPH UALK/N INVENTOR.

A TTORNEY l No .3 9w 8 2 S g 1 a s c w =3 a E mm m BYWM a 3AM 0N Dec. 15, 1936.

J. GALKIN 2,063,995

ORNAMENTAL LOOP STITCH SEWING MACHINE Filed Jan. 24, 1936 3 Sheets-Sheet 3 I Q/UJEP/V GAL K/N INVENTOR.

'BMM

A TTORNEY Patented Dec. '15, 1936 UNITED STATES PATENT OFFICE ORNAMENTED LOOP-STITCH SEWING MACHINE 4 Claims.

This invention relates to a sewing machine designed to make covering stitches and enlarged sideways projecting loops from the looper thread, the said loops lying entirely against the lower surface of the fabric being stitched upon.

An object of this invention is to provide in a sewing machine having two needles, a lower looper and an upper cross thread layer, a series of mechanism for forming enlarged sideways projecting loops from the looper thread, the said stitching being formed on any desired position of the fabric, or at the edge thereof.

Another object of this invention is to provide a machine of the character described, wherein the mechanism for forming the sideways loops holds said loops until the stitches made by the needles are set thus insuring that each sideways loop shall be of a predetermined size.

Another object of this invention is to time the mechanism which forms the sideways projecting loops so that one sideways loop is formed for every two stitches of the needles.

Another object of this invention is to provide a pattern cam which cooperates with a looper loop spreader for controlling the loop formation and the ratio of sideways loops to the number of needle stitches.

Another object of this invention is to provide an oscillating thread eyelet to pull off from a supply spool the required length of thread necessary for forming a sideways loop and prevent any strain on the looper thread when the spreader pulls the looper thread rearwardly.

With the above and other objects in view, the invention will be hereinafter more particularly described in connection with the accompanying drawings and pointed out in the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure l is a front view of a sewing machine embodying mechanism for forming loops from the looper thread.

Figure 2 is a fragmentary plan view, partly in section, the section being taken as line 22 in Figure 1.

Figure 3 is a rear view of the sewing machine embodying my invention.

Figure 4 is an enlarged plan view of a section of fabric which has been ornamented with stitching made on the sewing machine shown in Figures 1 to 3.

In the illustrated embodiment of the invention, the numeral It indicates the work supporting base of a sewing machine embodying my invention and which comprises the usual standard ll, having an overhanging arm l2 with a head I3 at its free end. In the head I3 is journalled the usual reciprocatory needle-bar l4 carrying two spaced needles l5. The needle-bar is 'reciprocated by a lever l6 mounted on a pivot shaft H. A looper I8 is oscillated and cooperates with the two spaced needles. The looper thread interlocks with the needle threads to form stitching as is well known in the sewing machine art. The material worked upon is held down by a presser foot I9 resting on a cloth plate secured to the work supporting base "I.

The presser foot I9 is pivotally connected to a presser foot shank 2| by means of a pin 22 and a pressure is maintained upon said foot by means of a leaf spring 23, shown in Figure 3. 'The presser foot I9 is designed mainly for vertical 0 sliding motion, the pivotal motion of the presser foot about the pin 22 being limited to very slight rocking motions.

As best shown in Figure 3, a bracket 24 is fastened to the lower end of a bar 25 secured in bearings 26 in the head I3. The bracket 24 terminates in a bifurcated endhaving a recess 21. Pivotally mounted in the recess 21 is an arm 28 having a forwardly reaching extension 29 which carries a downwardly extending thread-finger'30. The thread-finger 30 has a hook-shaped end portion 34 for carrying an additional thread back and forth across the two lines of stitching so as to spread a cross-stitch or covering stitch beneath the needle threads, as is well known in the art.

The mechanism which I have provided for forming loops from the looper thread is as follows: As best shown in Figure 2, I have secured a loop spreader 3] to a speader-carrier 32. The carrier 32 is pivotally mounted on a stud 33 secured to the base-plate 39 of the sewing machine. The actuating end of the spreader 3! is curved and is positioned so as to swing laterally across the looper when the threaded point of the looper has completed its oscillation away from the needles. In operation, the spreader 3| oscillates forward across the path of the looper and grabs the looper thread and draws it sideways of the line of stitching and to the rear in the form of a loop. The spreader holds the said a loop stationary until the sewing machine has substantially completed two stitches, when it again oscillates forward and releases the first mentioned loop and grabs the looper thread again and begins the formation of another sideways loop.

The spreader-carrier 32 is made of a fiat plate and is mounted between an upper guide plate 31 and a lower guide plate 38. The power actuated end 36 of the spreader-carrier 32 is oscillated once for every two stitches made by the needles, by the following mechanism. As best shown in Figure 1, a gear 39 has been fixed to the main shaft 40 and this gear meshes with a gear 4| fastened to a stud 42 which is mounted in parallel relation with the main shaft. The gears 39 and 4| are so proportioned that the gear 4| is rotated once for every two rotations of the shaft 40. A cam 43 has been fixed to the stud 42 and has a pattern groove 44 in its peripheral surface for receiving a pin or roller 45. A bellcrank lever 46 has been rotatably mounted on a vertical shaft 41. The shaft 4'! is supported in bearings 48 projecting from a bracket 49 fixed to the standard The bell-crank lever 46 has a lower arm 50 for actuating the spreader 3| and an upper arm 5| carrying the roller 45 by which it is actuated. The lower arm 50 of the bell-crank lever 45 has a bifurcated end 52 for adjustably fastening to a connecting bracket 53. The bracket 53 is pivotally secured to a link 54 by a pin 55. The other end of the link 54 has a pin 56 by which it is pivotally secured to a connecting bracket 57. The bracket 51 is fastened to the power actuated end 36 of the spreader-carrier 32. An elongated slot 58 in the end 36 of the spreader carrier, provides slidable adjustment in relation to a bolt 59 and permits increasing or decreasing the swing of the spreader-carrier 32 and the oscillations of the spreader 3|.

The cam groove 44 continues for about fivesixths of the circumference of the cam in parallel relation with the end face. The remaining one-sixth of the circumference of the cam groove has been made to follow a path of an arc of a circle along the axis of the cam, as shown at 62.

The sideways loops being formed by the spreader below the cloth plate 20 are carried upwardly through an opening 60 in the cloth plate through the feed of the material and continue as an ornamental addition to the stitching performed by the sewing machine.

I have provided improved mechanism for oscillating the thread-finger 30, as follows: As shown in Figure 2, a vibrating connection 63 is in engagement with a ball-shaped eccentric 54 mounted on the main shaft 40. The other end of the connection 63 is in engagement with a ball 65 at the end of an arm 66, as shown in Figure 3. The arm 66 is fixed to the lower end of the vertical shaft 41. Rotation of the main shaft 40 imparts a vibrating motion to the connection 63 and an oscillating motion to the shaft 47. As best shown in Figure 1, I have mounted a collar 61 at the upper end of the shaft 41. The collar 61 has a forwardly extending arm 58 and a ball 69 at its lower face. A link 10 is in engagement with the ball 69 at one end and at the other end with a ball H at the upper face of the arm 28. oscillatory motion of the shaft 41 thus imparts oscillatory motion to the threadfinger 30 about a pivot pin 72.

A thread-eyelet 13 has been fixed to the oscillating shaft 41. The oscillating thread-eyelet 13 serves to pull thread off a supply spool (not shown) and supplies a sufficient length of thread necessary for forming an ornamental sideways loop and prevents any strain on the looper thread when the loop spreader 3| grabs the looper thread and moves it rearwardly when forming sideways ornamental loops.

It is necessary in order to have all sideways loops of uniform size, to prevent lost motion in the operating mechanism as, if there were lost motion, there would be an overthrow and the spreader would pull off different lengths of thread for the successive loops. For this purpose, all the linkages have been designed so as to operate without any lost motion. This mechanism is thus adapted to operate at the very high speeds at which sewing machines are operated. There has thus been provided a positive drive without any lost motion in the pickup.

It is also to be noted that the fabric operated upon on the sewing machine heretofore described lies with the normally exposed surface in contact with the cloth plate or needle plate 20.

Figure 4 is an enlarged plan view of a section of fabric which has been ornamented with stitching made on the sewing machine shown in Figures 1 to 3. Figure 4 shows two lines of needle stitching interlocked with cross-stitching, the cross-stitching being ornamented with sideways projecting loops 75 formed by my looper-loop spreading mechanism. Some of the stitching i6 is shown at the edge ll of the fabric section 18 and other of the stitching 79 is in scalloped form and lies on a portion of the fabric removed from the edge 17.

It is obvious that while the gears 39 and 4| and the cam groove 44 are shown in proportion so as to produce one sideways loop for every two stitches, that I may substitute other gears and another cam groove so as to produce one sideways loop for more than two stitches and to provide spacings between the loops.

I claim:

1. In combination with a sewing machine having a plurality of needles and a main shaft positioned intermediate the base-plate and the work supporting base, a stud fixed above and in spaced parallel relation with said main shaft, said main shaft having gear means fixedly mounted thereon and being intermeshed with gear means rotatably mounted on said stud, said upper gear having a cam fixed thereto, a bell-crank lever having upper and lower horizontally disposed arms, said upper arm carrying a roller and being in tangential engagement with a roller groove in the outer peripheral surface of said cam, a loop spreader pivotally mounted on the base-plate of said sewing machine, a link connecting said spreader with the lower arm of said bell-crank lever and thereby constraining said spreader to oscillate due to the rotation of said main shaft, said needles being spaced apart and being movable vertically for forming two parallel rows of straight-line stitching, said bell-crank lever being rotatably mounted on a vertical shaft, and means driven from said shaft for laying a crossstitch beneath the needle threads.

2. In a sewing machine, the combination with two reciprocating needles, an oscillating looper cooperating with the needles, a spreader pivotally mounted at one side of said needles to move in an arc of a circle from a point in front of the needles to a point in the rear, means for oscillating said spreader entirely below the fabric to cause it to engage the looper-loop below the fabric and carry it sideways and rearwards a two stitch length distance, said means comprising a bell-crank lever and a cam having a pattern groove on its outer peripheral surface for actuating said lever, a portion of said groove having a substantially linear formation for holding said spreader stationary while two stitches are formed 75 by the needles and a portion of said groove having an arcuate formation for oscillating said spreader to cause it to move forward and take hold of said looper-loop and then carry said loop rearwards, the forward motion of said spreader causing release of said sideways loop after the two needle stitches have been formed.

3. In a sewing machine, the combination with a work supporting base and two reciprocating needles, an oscillating looper cooperating with the needles, a spreader pivotally mounted at one side of said needles to move in an arc of a circle from a point in front of the needles to a point in the rear, means for oscillating said spreader entirely below the fabric to cause it to engage the looperloop below the fabric and carry it rearwards and sideways a two stitch length distance, said means comprising a bell-crank lever and a cam having a pattern groove on its peripheral surface for actuating said lever, means operated from the main shaft of the sewing machine for rotating said cam once for every two rotations of the main shaft, said cam groove having a pattern outline designed for controlling said sideways loop I formation.

4. In combination with a sewing machine having a main shaft positioned intermediate the base-plate and the work supporting base, a stud fixed above and in spaced parallel relation with said main shaft, said main shaft having gear means fixedly mounted thereon and being intermeshed with gear means rotatably mounted on said stud, said upper gear having a cam fixed thereto, a bell-crank lever mounted vertically rearwards of said cam and having upper and lower horizontally disposed arms, said upper arm carrying a roller and being in tangential engagement with a roller groove of pattern formation in the outer peripheral surface of said cam, a loop spreader pivotally mounted on the base-plate of said sewing machine for horizontal oscillatory motion, and a link connecting said spreader with the lower arm of said bell-crank lever and thereby constraining said spreader to oscillate due to the rotation of said main shaft, said spreader being timed to oscillate once when two or more stitches are formed by the needles.

JOSEPH GALKIN.

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