US2202609A - Ornamental stitch sewing machine - Google Patents

Description

M215v 28, 1940. c. sTuRiLlNGER 2,202,609

ORNAMENTAL STITCH SEWING MACHINE Filed `lrlalh 24, 1939 3 Sheets-Sheet' 1 May 28, 1940. c. sTURzLlNGER ORNAMENTAL STITCH SWING MACHINE Filed March 24, 1939 3 Sheets-Sheet 2 May 28, 1940. c. sTuRzLlNGER ORNAMENTAL STITCH SEWING MACHINE 3 Sheets-Sheet 5 Filed arch 24, 1939 Patented May 28, 1940 y UNITED STATES PATENT OFFICE 2,202,609 I I ORNAMENTAL STITCH SEWING MACHINE Charles Sturzlinger, Bronx, N. Y.

Application March 24, 1939, Serial No. 263,840 i 3 Claims. (Cl. 112-98) This invention relates to sewing machines and Another pair of brackets 2U, offset from and in more particularly to power driven, factory maadvance of the brackets Il provide bearings for chines for producing ornamental embroidery and a tubular rock shaft 2| (see Figure 2) arranged fancy stitches. parallel with the shaft I8. Integral with the base 5 An object of this invention is to provide a I5 is a hollow unit comprising an upright ele- 5 stitch forming 4 machine with interchangeable ment 22,l a horizontal arm 23 and a box-like housmeans whereby many varieties of designed ing 24 open at the outer end, this unit being comstitches may be made in differing predetermined monly known as the machine head, and is so patterns requiring unlike lengths of stitches in referred to in the following description.

i transverse and lateral arrangement. Rotatably mounted in the arm 23 is a drive Another feature is in the provision of means shaft '25 having on its rearwardly extending end whereby cam actuated levers control the movea hand wheel 26 and belt driven pulley 21. Inment of needle and goods in definite timed reteriorly of the arm 23 is a flanged sprocket wheel lation. 28, engaging a link belt 29 trained over-another M Afurther purpose is to provide a stitching masprocket 30, fixed on the extending end of a `15 chine with improved mechanism which actuates drive shaft 3l rotatable within the tubular rock stitch forming means, capable of producing zigshaft 2|. Adjustably clamped to the shaft 2l zag, fagoting and other forms of ornamental and adjacent the inner face of the lug- 20, is a stitches. hubbed rocker arm 32, to the outer end of which These and other important objects are accomis pivotally secured by a stud 32', a link 33 havplished by the novel construction, combination ing at its upper end an enlarged head 34, cross and arrangement of parts hereinafter described bored and capped for engagement upon a iianged and illustrated in the accompanying drawings, eccentric 35 secured on the drive shaft 25. constituting an essential component of this dis- A triple thread wOrm 31 fixed on the shaft 25, 25 closure, and in which: 1 meshes with a worm gear 38, firmly fixed on a '25 Figure 1 is a front elevational View, partially in cam shaft 39 extending transversely through the section and cut away to show mechanism within arm 23 and rotatable in bearings 40 and 4I;

the head.k a cover plate 42 prevents entrance ofdust or lint Figure 2' is an elevational view showing the rear into the arm and alsofprovides additional bearside of the machine head, the lower portion cut ing length for the shaft. k 36 away to show the mechanism below the work A plate 43 is secured to the side of the arm 23 plate. as shown in Figure 2 in which an annular open- Figure 3 is a transverse sectional view taken on ing is provided permitting free rotation of the line 3-3 of Figure 1. shaft 39. In the forward portion of the plate 43 i Figure 4 is a plan view of a portion of the mais a pivotal stud 45 having extending ends on chine base-showing the lower feed dog and its conwhich front and rear links 46 and 4.1 are fixed.

nection with the rock shaft. to move in unison.

Figure 5 is a transverse sectional-view taken Referring to Figures 4-8 there is shown a cam on line 5-5 of Figure 4, showing a looper-bobbin 48, having. a groove 49 on one side adapted to 40 and its connectionsv for rotating. actuate the lower feed mechanism, and a groove Figure 6 shows an ornamental stitch as proor track 50 to produce a lateral ,oscillating mo-,f duced by the cams indicated in Figure 8. tion to the needle bar. This cam 48 is remov-4 Figure 7 is a top plan view of the throat plate ably held on the rear end of the shaft 39 by a key in detail. as best seen in Figure 3. I l 4, u Figure 8 shows a front, rear and sectional View Referring to Figure 2, the link 46, carried on 4'5' of a double faced cam used in producing the the stud 45 is provided with a cam follower operstitch shown in Figure 6. able within the groove 49 of the cam 4,8; on the'` Referring to the drawings in greater detail, opposite end of the stud 45, 1311 link 41 iS Xed,v

the numeral I5 designates a level base or work in a manner to compel unison of movement with' 50 plate, having a strengthening rib I6 and a pair respect to the link 46; the lower portion of the 5o of vbrackets I1, integral with the base, extending link 41 is provided with anv arcuate slot 5I 'for downwardly providing bearings for a feed shaft adjustment. Ill,Y held from end movement by collars I9 se- Pivotally mounted at the upper portion of the.v

cured to the shaft adjacent the inner faces of the head 24' is a needle 4guide bar 52 provided with' 552 bracketsl I1. f aligned bearing elements 53 in which a needle 6i? bar 54 is slidably mounted; near the lower end of the guide b-ar are opposed laterally extending lugs 55--55, the former having a curved slot 51 in which is a shouldered retaining screw 53;` the lug 56 has a rigid pin 59 fixed therein.

Transmission of vibratory movement from the link 41 to the needle guide bar 52 is provided by a connecting link 69, having adjustable bearing ends Eil-62 adapted for connection on the pin 59 and a stud 63, adjustable inthe slot 5I of the link 41.

Bolted to the rear of the upright element 22 is an angle plate 64, to which a lever 65 is pivotally engaged at its rear end by a shouldered thumb Screw B6 and at its reduced front end, at a point in vertical registration with the cam axis 39, is a fixed cam follower El, operative in the groove 5U.

Midway in the length of the lever is a slot 58 for adjustment of a forked yoke 59 having an upwardly extending lug 19, provided with means ,for threadably engaging a shouldered clamp screw II for lateral adjustment between the yoke 69 and the lever 65.

A knurled headed adjusting screw 12 is freely operable in the forked ends of the yoke and threadably engages an enlarged head i3 at the upper end of a bent vlever i4, passing through an aperture I5 in the upright 22, then downwardly through the base I5 and terminating in a curved end formed at an angle and pivotally engaged by shoulder screw I4 with a lever 'I6 clamped to the feed shaft I8.

Another lever TI, adjustably clamped to the hollow shaft 2|, is provided with a fixed pin 'I8 engageable in a swivel block 19, slidable within a forked element of a feed dog 90 having an upward extending toothed element 8| passing through the throat plate 82 and adapted to move the fabric in transverse reciprocating directions. The rear portion of the feed dog 8B has at its rear end a fixed pin 83, rotatably engaging the end of a lever arm 84 adjustably clamped to the rock shaft I8.

The front portion of the cloth feed dog 9|) is provided with extending hub elements 85-95 (see Figure l) and is mounted between bearings 81-88 of the feed dog carrier 84, and is pivotally held by a shaft 89 passing therethrough. The feed dog carrier has a bore 90 fixed to the rocker shaft I8.

A looper-bobbin |90, of conventional type, is initially operated by a pair of bevel gears IDI-|02, the gear |02 being xed on the end of the drive shaft 3| to mesh with the gear IOI, which is xed on a shaft |53, revolvable in a bearing Ilidextending transversely through a lug |05 secured to the base I5. The looper |00 is removably held on the inner end of the shaft |93 and adjacent the hub of the bevel gear IBI.

The throat plate 82, best shown in Figure '7, presents a flat plate adapted to iit a recess formed on the top face of the base I5 and there removably held by screws |06 engaging threaded holes |01 of the base I5.

Pierced through the plate 82 are openings IGS-|09 receptive of the feed dogs 8| movable in the openings; a central elongated slot I I0 permits movement ofthe needle III longitudinally therein, also an upwardly extending guide pin II2.

The needle rbar 54 receives initial motion from a balanced eccentric I I3 rigidly secured to the drive shaft 25, which, with associated parts connecting the eccentric and needle bar in the well known conventional manner, provides a vertical reciprocating motion to the needle bar.

A presser foot bar I I4 is manually operated by a handle H5 which raises and lowers the bar when required. Secured to the lower end of the bar im is a compensating presser foot II6 consisting of a pair of opposed presserk elements I ii-I It!` adapted for vertical reciprocating movement, independently of each other; a slotted plate I I9 retains the presser elements in slidable contact with the presser foot II6 and pins |20, working in slots in the plate I I 9 assist in keeping the presser elements in level normal position; upward movement of either presser element is limited by contact of the top of the plate I I9 With a stop collar I2i xed to the presser foot IIS.

The operation, the machine is hingedly mounted on a work table having means therewith for conveying rotary motion through a belt trained over the drive pulley 21 fixed to a shaft 25 passing longitudinally through the arm of the machine in a manner commonly employed. 1

Transversely of the driven shaft 25 is a short shaft 39, carrying a worm gear 38 in mesh'with';

a Worm 3?; removably held on shaft 39 is a cam d8 having on opposite faces grooves differing in outlines thereby producing dierent `stitch 11el signs. Below the base I5 are a tubular shaft 2| anda solid member 3| on which is mounted a sprocket 3B aligning with another sprocket 28 fixed on the shaft 25 and a link belt 29 is trained over the. sprockets. ,Y An eccentric 35 fixed on ther shaft 25 carries an arm 33, connected to a lever 32 adjustably clamped to the tubular shaft, thereby imparting a rocking motion to the shaft 2i, when the shaft 25 is rotated. At the opposite end ofshaft 2| is adjustably clamped another lever 'Il having yat its end a pin 'i3 engaging a kblock 'I9 slidable in a forked element of a feed dog 85 thus Vitwill beseen that as the shaft 2| is rocked, or partially rotated, the toothed feed dog 89, will be raised and low-l ered in timed relation to the needle bar 54.

Below the plate. I5 is another rock shaft I8, motion being imparted to it by means of interconnected elements, as the rocker arm 16, adjust# ably clamped to the rock shaft I8; an out-reaching link *I4 extends 'upwardly and then outwardly through the machine frame'and has a head 13 receptive of a knurled headed screw 'F2 for fine transverse adjustment of the feed dog 8|, anda yoke or forked member Eid carries theadjusting A cam follower link 65, pivoted atone end to' Vbeing adjustably clamped to an upwardly extending element ''i of the yoke t9, providing a complete, positive means for `adjustablycontrolling the rocking movement of the shaft i3, on the front end of which is secured a carrying head element t4, having bearing means adapted to engage a pin S9, passing through hub elements -95 formed at the end of feed dog 80; it will now be seen that as the shaftV i8 is rocked, the feed dog will be moved forward and backward by the action of the head 84 which is fixed to the rock shaft I8. y

A vibratory, or laterally reciprocating motion of the needle Iii isfinitially attained by means of the cam 49 having a groove 49 formed on,its face; a cam follower link 45 pivotally operating through a plate 43 is rigidly connected to a slotted link 51; a needle vibratory bar 52 is pivoted attS, 75:

vso

vided with a stud S adapted to pivotally retain one end of a connecting link 60, the opposite end having means for pivotal engagement with a stud 63 secured adjustably in a slot 5I of the link 41. Y It will b`e seen that as the cam 48 is rotated,

the needle will be moved sidewise in varying degrees of movement 'as the needle passes through the cloth, and below the bed plate of the machine,` and the .throat plate 82, as in Figure 7.

The presser foot IIB secured to the bar IIII is provided with a pair of compensating rocker elements I I'I-I I8 slidably mounted on the iiat lower portion o fthe foot H6; these sliding members are controlled by the cam-like element I I9 which keeps them in a 'normal horizontal plane. The purpose of these independently movable rocker elements is to compensate for inequality in thick-l ness of, materials being fed under the presser foot.

In the formation of ornamental stitches, it is necessary that a combination bobbin and looptaker bel employed; heretofore a conventional type of bobbin holder has been used. Referring to Figures 2 and 5, avbobbin holder is shown connected to a bevel gear IUI, xed to a shaft ID3 rotatable in a bearing |04 adjustably heldin a lug |05 secured to the under side of the base plate I5 and in mesh with a mating bevel gear |02,`

fixed on the end of the constant drive shaft 3I; it will be understood that gears, other than of equal proportions, may be required to produce certain forms of ornamental stitches. It will also be apparent that cams greatly varying in groove outlines must be employed to meet conditions involved when a change in stitch pattern is made.

Many different modifications of this invention may be made without departing from the spirit and scope thereof, and it is to be understood that it is not desired to limit the specific embodiments thereof except as defined in the appended claims.

Having thus described the invention, what is claimed as new and sought to secure by Letters Patent is:

l. In a sewing machine for producing embroidery stitches, in combination with the needle, feed and shuttle operating means, a double faced cam, one of its faces controlling the action of said needle and the other face controlling the action of said feed, a lever actuated by the latter named face, a yoke adjustable on said lever, and screw actuated means carried by said yoke for minutely adjusting the action of said feed and means for rotating said cam.

2. In a sewing machine for producing embroidery stitches, in combination with the needle, feed and shuttle operating means, Aa cam, means actuated vby the machine to rotate said cam., a lever actuated by said cam, a yoke adjustable horizontally on said lever, an adjusting screw revoluble in said yoke, a second lever mounted on said screw, a spindle operatively connected to said feed, and connections to said spindle actuated by the last named lever.

3. In` a sewing machine for producing Ornamental stitches including a reciprocable needle and a movable feed, a double faced cam interchangeably driven by the machine, one of said faces connected to oscillate said needle bar in a given path, the other cam face to actuate said feed, a `lever directly driven by the last named cam face, said lever being pivoted on a horizontal axis remote froml the cam and having a slot midway its length, a yoke adjustable in the slot, said yoke having spaced depending arms, a manually operable adjusting screw mounted in said arms, a spindle'to actuate said feed, and a link to actuate said spindle, said link being connected to said screw whereby it may be adjusted.

CHARLES STURZLINGER.

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