US1089751A - Automatic stitch-controller. - Google Patents

Description

M. DRUGKERMAN.

AUTOMATIC STITCH CONTROLLER.

APPLICATION IILBD DEC.11, 1912. 1,089,751. Patented Mar. 10, 1914.

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AUTOMATIC STITCH CONTROLLER.

APYLIOATION FILED DEC.11, 1912. 1,089,751 Patented Mar. 10, 1914.

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I I #I/IIIIl/IIIIIIIII II I III/III/A M INVENTOR ATTORNEY M. DRUGKERMAN.

AUTOMATIC STITCH CONTROLLER.

APPLICATION FILED DEC.11, 1912.

Patented Mar. 10, 19%

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INVENTOR WITNESSES BY 68 Wm ATTORNEY FIGE.

Max naucxnnmalv, or BROOKLYN, New YORK.

AUTOMATIC STITCH-CONTROLLER.

Specification of Letters Patent.

Patented Mai. 10, 1914..

Application filed Decemberll, 1912. Serial No. 736,130.

To all whom it may concern Be 1t known that I, MAX DRUOKERMAN, a

citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Automatic Stitch-Controllers, of which the following is a specification, taken in connection with the accompanying drawings, which form a part of the same.

My invention relates to sewing machines and more particularly to an automatic stitch controller for sewing, machines having a vertically and laterally movable needle. This general class of sewing machines, having a laterally and vertically movable needle, is old and applicant makes no claim to such a machine except when combined with his automatic stitch controller.

For purposes of illustration applicant has illustrated a sewing machine of this class, somewhat diagrammatically, simply that the operation of is automatic stitch controller can be the more readily understood by those skilled in the art.

In the accompanying drawing showing illustrative embodiments of my invention and in, which the same reference numerals refer to similar parts in the several figures, Figure 1 is a front elevation of my inven tion applied to a sewing machine having a laterally and vertieally'movable needle; Fig.

2 is a sectional and side elevation substantially on the broken line 2-2 of Fig. 1'; Fig. 3 is a detail fragmentary plan view of the head of the sewing machine; ig. dis a plan view of a fabric on which an embroidery seam, madeof a plurality of uniform and symmetrical units are embroidered by means of my automaticstitch controller; it being understood that the seam preferably conceals the fabric under it; Fig. 5 is a diagrammatic view of one unit of the embroidered scam, the distance between the threads being purposely exaggerated for clearer illustration; Fig. 6 is a sectional view through a sewing machine showing a difierent arrangement of belts andpulleys from that shown in Figs. 1 and 2; and Fig. 7 isa longitudinal vertical section through the clutch which I preferably employ, though it is to be understood, of course, that any form of clutch may be used. I

In the illustrative embodiments of my invention shown in the drawings, 1 is a sewing machine of any approved construction having a head 2, a vertically and laterally movable needle 3 carried'by a vertically and lat- 'e'rally movable needle bar 4 which,

in turn, is carried by the link 5, Fig. 3 pivoted on the presser foot bar 6. The needle bar is pro vided with a pitman 7 slidably connected to the needle bar rock-arm 8 which is pivoted on the head 2 at 9 and provided with a slot lOfor the reception of the slide 11 to which is connected a link 1.2, the other end of which is connected to the lever 13 mounted on the rock shaft 14 (Figs. 1 and 3) which passes through the bearings 15 and 16 carried by the brackets 17 secured on the head 2 of the machine in any suitable manner such as-lby the screws 18, 18. On the opposite end of the rock shaft 14: I mount an oppositely disposed lever 19 connected to a link 20 which is connected at its other end to a lever '21 pivoted at 22 to the head 2. 23 of this lever 21 is-provided with a split sleeve 24; to receive the controller rod 25. The adjustment between the controller rod 25 and the split sleeve 24., carried by the lever 21, is controlled by the screw or other connections 26, Fig. 2, so that the controller rod 25 can be adjusted in diiferent.positions within the split sleeve.

It is obvious that by pressing up on the controller rod 25, against the action of the spring 27, that the lever 21 will be caused to rock on itspivot 22 which, in turn, will cause the link 20 to depress the lever 19, and this action will rock the rock shaft 14 and cause the oppositely disposed lever 13 to draw up upon the link 12 and cause the slide 11 connected to it to approach nearer the pivot 9 of the ,needle bar rock-arm 8. It is Well known in this class of machines that this action will cause the slide 11, with its connected pitman 7 to rock in a smaller are which will. eorres ondingl decrease the lateral movement 0 the nee le 3, causing it to make a shorter lateral stitch than it will make when the-slide is in the position shown in full lines in Fig. 1. The mechanism of the type of sewing machine just described is substantially old in the art and no claim is made to it per 80.

My invention is in automatically and positively controlling the movement of the controller rod so as to automatically and positively form an embroidered seam of one or more units, preferably a plurality, in which the lateral movement of the needle 3 will be caused to automatically make a predeter- The other end Y mined symmetrical unit having stitches of maximum and minimum. length. I thus form an embroidery seam which will not but each thread. in

mined number of maximumand minimum only threads and a, certain predetermined number of intermediate threads of varying length, the whole being automatically, positively and symmetrically embroidered on the fabric.

For purposes of illustration 1 have shown each unit of my embroidery seam 29 formed of sixteen needle threads which are shown diagrammatic-ally in Fig. 5, the needle threads 31, 31 of minimum length and the maximum threads 32, 33, 34 and 35 being approximately the same length while the intermediatethreads 36, 37 38, 39 and 40 progressively increase in length from the minimum to the maximum threads. The needle threads as usual pass'through the fabric 28 and form loops 41, 41 which, in my 'invem tion, are of different length and there cooperate with the shuttle or locking thread 42 which passesthrough the- loops 41, 41 in the well known manner common to this class of machines, I

While I have shown my units 30, v 30 formed of sixteen threads, it is, of course, to be understood-that this number is simply by way of illustration and that the num er of threads in any unit may be increased or decreased as found'convenient or expedient to make one or more'symmetrical units.

' driven by the same power as 45 My automatic controller is referabl that which drives the machine and will automatically and positively control and govern the lateral throw-of the needle 3. Various means "for accomplishin this result may be 'devised, the one s own being simply illustrative. Preferably I control the lateral throw of. the needle 3 by automatically controlling themovement rod' 25.

. By way of example I have shown a cradle 43. pivoted on the stand or beach 44, on

which the head2 of the machinerests, 'llhe cradle is preferably pivoted .to lates 45 by means of the arbors 46; On 11'. is Cradle 1 adjustably mount a pin47 provided witha head 48 which directly contacts with the end of the controller rod 25. The pin is preferably adjustably securedto the cradle 43 by means of the screw 49, Fig. 1. To this cradle ll also adjustabl secure a bent-arm 50 having one end 51 a ustably secured in a portion form of connection will permit free rotation of the controller cause it to engage to the boss 52 carried by the cradle. and cooperate ing with a set screwi-53.- --The other end 54 of the bent arm 50 carries a wiper 55=-which is preferably provided with; reduce the friction between it/and the cam 57, mounted on rights 60, 60. this same shaft 58 l mount a pulley til-which is temporarily s e' cured to the cam57 in any suitable mann r such as by the screws 62, 62. A belt 63 passes around the pulley 61 and around a roller 56, to a '70 the shaft 58. Thls shaft 58 J is secured in bearings 59 carried. by the u'p smaller pulley 64 preferably carried by the I driven pulley 65, the two being secured together in any suitable manner such as by the set screw 66, Fig. 7 the head of which is preferabl sunk below the level of the groove 6 in the pulley 64. This driven pulley .65 is loosely mounted on the stub shaft 68 carried by the bracket 69, the stub shaft bein preferably secured immovably to thebrac Fig. 7. iOn this same stub shaft 68 I mount. the conical drive pulley 71 and provi' suitable means which will a limited lateral movement upon it so as to bring the clutch surface 72 on the drivepulley 71 in contact with the friction surface 73 on the pulley 65. One

et by means of the set screw 7 0,-

permit thefjdrive pulley 71 to rotate loosely on'the stub shaft 68 and yet have manner of mounting this pulley is to provide the stub shaft 68 with a" peripheral groove 74 and pass 'a pin 75 through the 76 of the drive pulley 71.- This of the drive pulley on the stub shaft, the pin 7 5 rotating within its groove 74 and yet will; permit lateral movement of the driving pul-v 9y The clutch ma be operated in any suit-.

71 when'it is desired to clutch'the parts.

ablemanner. l ave shown it'operated by a bent arm reduced end 78 of the friction ulley 71 the arm being mounted upon the rock shaft 79 (lFigs. land 2) which is mounted in the s eeve transmit power to the machine the treadle 85 is operated soas to 'depress' the arm 77,

77 adapted to contact with the with the reduced portion 11c 80 carried by the bracket .69. 'll1e other end of. the rock shaft 79 is provided compressed when. the

adwstable connections 78 to bringthe friction surfaccs'72 and 73'.

together and 'n that way transmit power driven pulley 65 which in turn transmg machine mechanism of mits power through the belt 89 to the sewthe head through the pulley 90.

At the same time that the driven pulley 65 is transmitting power through the belt 89 to the pulley 90, the pulley 64 is transmitting power to pulley 61 through the belt 63 and causin the cam 57 to rotate with a certain predetermined speed, depending upon the relative size f the pulleys 64 and 61.

In the mechanism previously described, itis clear that the connections and 50 will cause the cradle 43 to rock With a certain predetermined speed, dependent upon the speed of rotation of the cam 57 and this will automatically control the movement of the controller rod 25 and consequently control the lateral movement of the needle 3.

One revolution of the cam 57 and the pulley 61 makes one unit 30. Applicant has shown each unit formed of sixteen threads which is the particular unit formed by the particular gearing shown. It is obvious that as the number of stitches made by the machine is constant they can be automatically formed in units having a greater or a less number of stitches than sixteenby simply changing the relation of the controller gearing, as for example, by making the pulle 61 smaller, which will cause the number of stitcheslin the different units to decrease for the cam 57 would be caused to operate faster. Conversely, by enlarging the size of the pulley 61, each unit will contain a greater number of threads than sixteen for the cam 57 will rotate slower.

When either one unit has been formed, or a plurality of them as shown in Fig. 4, and it is desired to stop the machine for any purpose, it is merely necessary to operate the treadle 85 in a reverse direction which will release the clutch and at the same time will throw the brake 91,'carried by the arm 81, into contact with the pulley 65, the spring 84 assisting this operation.

To insure theroller 56 contacting with the cam I preferably employ a spring 92 which has one end connected to the arm and the other to a fixed support (not shown, as this illustration would simply confuse the drawing). I also preferably employ a'counter-weight 100 on the pulley 61 to balance the cam 57. I may in some cases have the belt 93 of the pulley 61 pass over the small pulley 94 shown in dotted lines in Fig. 6

' which is mounted upon the needle barshaft 95, instead of having the pulley 64 mounted upon the stub shaft 68 shown in Figs. 1, 2

and 7. i

To make the embroidery units such as shown in Fig. 4, I employ the usual double presser feet 96, 96 mounted on the presser foot bar 6. My automatic stitchcontroller, however, will also make circular embroidery seams in imitation of a leaf such as shown in my companion application executed contemporaneously with this application for an improved circular embroidery seam and filed at the same time being Serial No. 736,129. The automatic stitch controller will readily operate with the form of attachment shown in my Patent N 0. 1,051,315 for improvement in sewing machine.

Having thus described this invention in connection with the illustrative embodiments thereof to the details of which I do not desire to be limited, what is claimed as new and what it is desired to secure by Letters Patent is set forth in the appended claims:

1. The combination in an embroidery sewin machine having a vertically and lateraly movable needle-bar, of :1 depending slotted pivoted needle-bar rock arm, a slide mounted in the rock arm, connections between the slide and the needle-bar, a vertically extending link connected to the slide, arock shaft, a lever mounted .on the rock shaft and connected to the vertically extending link, an oppositely disposed lever mounted on the rock shaft, a depending controller rod, connections from the depending controller rod to the second lever, and automatic means independent of the depending controller rod and co6perating with it to automatically govern the movement of the depending controller rod.

2. The combination in an embroidery sewing machine having a vertically and laterally movable needle-bar, of a depending slotted pivoted needleJoar rock arm, a slide mounted in the rock arm, connections be tween the slide and the needle bar, a vertically extending linkconnected to the slide, a rock shaft above the plane of the sewing machine, a lever mounted on the end of the rock shaft adjacent; to the rock arm, a link connecting the slide with the lever, an oppositely disposed lever mounted on the other end of the rock shaft, and connections from that lever and on the opposite side of the machine from the rock arm connected with a depending controller rod, a depending controller rod and automatic means independent of the controller rod and coiiperating with it to automatically govern the movement of the controller rod.

3. The combination in an embroidery sewing machine having a vertically and laterally movable needle-bar, of a' depending slotted pivoted needle-bar rock arm, a slide mounted in the rock arm, connections be tween the slide and the needle bar, a vertically extending link. connected to the slide, a rock shaft above'the plane of the sewing machine, a lever mounted on the end of the rock shaft adjacent to the rock arm, a link connecting the slide with that lever, an oppositely disposed lever mounted on the other end of the rock shaft, and connections from that lever and on the opposite side of the machine'from the rock arm connectedwith a depending controller rod a depending controller rod, and automatic vertically 6 er- 5 ated means independent of the contro ler rod and codperating with it to automaticallylift the controller rod.

4:. The combination in a sewing machine having a vertically and laterally movable 10 needle, of a slotted pivoted needle bar rock arm, slide and connectlons to control the lateral throw of the needle, a controller rod, a support for the sewing machine, a cradle pivoted to the support and provided with a 15' member to cooperate with the controller rod,

a stub shaft, a driven pulley. mounted loosely upon the stub shaft, a drive pulley loosely mounted upon the stub shaft and adapted to have a relative longitudinal, movement on the stub shaft, a pulley adapted to cooperate with the drive pulley, a cam carried by this latter pulley, a wiper carried by the cradle adapted to be operated by the cam, and means to move the drive pulley laterally to engage the driven pulley.

7 .MAX DRUCKERMAN.

Witnesses ALAN JoHNsoN,

Ro'sn MENK.

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