US1196534A - Sewing-machine. - Google Patents

Description

e. M. EAlVlES ml 8. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. 1913. 1,1 9 Patented A11 29, 1916.

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A TTOR/VEV G. M. EAIVIES & J. S. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. 1913.

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G. M. EAMES & J. S. FINCH.

SEWING MACHINE.

APPLICATION FILED JUNE 18. I913 1 1 96.53% Patented Aug. 29, 1916.

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WITNESSES.

' 0/7/11 5 9271/6/0- v mzmwi d 2 ATTORNEY GEORGE M. EAMES AND JOHN S. FINCH, OF BRIDGEPORT, CONNECTICUT, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Aug. 231, 1916.

. To all whom it may concern:

Be it known that we, GEORGE M. EAMEs and JOHN S. F INCH, citizens of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to-the accompanying drawings.

This invention relates to improvements in sewing machines of the class employing a needle-carrying bar having movements in different vertical planes for effecting the ordinary straight-away seam and a seam composed of zigzag stitches of given or varying amplitude, and has for its object to provide improved means for controlling the adjustment of the needle-bar for effecting the seam desired.

Referring to the figures, Figure 1 is a front side elevation of a sewing machine equipped with the invention, a portion of the bracket arm and bed-plate being broken away to illustrate more clearly the features in construction important to the invention. Fig. 2 an underside view of the sewing machine illustrated in Fig. 1, Fig. 3 a rear side elevation of the sewing machine shown in the previous figures, a portion of the bracket arm and bedplate being broken out to illustrate more clearly the means employed for retarding and accelerating the rotary movements of the loop-taker to meet the requirements of the lateral movements of the needle-bar, Figs. 4, 5 and 6 detail views, to be referred to hereinafter, and Fig. 7 comprises diagrammatic views of the seams effected by the present construction.

As the invention relates mainly to the construction and application of the means for controlling the movements of the needlebar, only such reference will be made to the other elements of the machine as is deemed necessary for a proper understanding of its application.

1 represents the bed-plateof the sewing machine upon which is mounted the bracket arm comprising the arm bracket 2 and standard 3, 4c the main or needle-bar-driving shaft provided at its rear end with a hand or band wheel 5 and at its opposite end with a commonly-employed shaft flange (not shown) to which is pivotally connected the usual needlebar-actuating link (not shown) operatively connected with the needle-bar 6 carrying the eye-pointed needle 7, 8 and 9 the needle-thread tension and take-up, respectively, 10 the cloth-presser-carrying bar and 11 the cloth-presser. The needle-carrying bar 6 is mounted to move vertically in the needle-bar-carrying frame 12 pivoted at its upper end on a suitable stud bolt threaded into the bracket arm (as shown at 13), and 14 represents the presser-lifting lever. for moving the cloth-presser vertically to accommodate the positioning of the fabric with respect to the line of needle actuation.

15 represents the feed-shaft mounted in suitable bearings formed at the underside of the bed-plate and having formed integral with it the bearing lugs 16 and 17 into which is threaded the bolt 18 secured against ac cidental movement by a nut 20, and upon said bolt is pivoted a feed-dog-carrying bracket 21 provided with a feed-dog 22, the opposite end of said shaft being connected by an arm 22 with a feed-connection 23 I whose upper end embraces the usual feedconnection eccentric (not shown) carried by the main shaft, thus transmitting from said last mentioned shaft feed movements to the feed-dog.

24 represents the feed-lift shaft mounted in the manner of the shaft 15 and carrying at its forward end an arm 25 provided with a stud screw 26 carrying a slide block 27 which engages the usual slot (not shown) formed in one end 28 of the lever 29, the latter forming a part of the feed-dog-carrying bracket 21. The opposite end of said feed-lift shaft is connected by an arm 30 with a feed-lift connection 31 whose upper end embraces a feed-lift eccentric 32 carried by the main shaft, from which latter vertical movements are transmitted to the feed-dog.

33 represents a spiral gear carried by the main shaft, said gear meshing with'a spiral gear 34 carried by a cam shaft 35 mounted at one end in a bearing 36 formed in the On the cam shaft 35 is mounted a needlevibratingcam 37 to be referred to hereinafter.

38 represents a-rotary loop-taker-aotuatin I ing shaft mounted in suitable bearings depending from the sewing machine bed-plate and carrying at its forward end a spiral gear 39 which meshes with a like gear 40 (shown in dotted lines only, Fig. 1) secured on the rotary loop-taker shaft 41, the

latter being mounted in the usual manner below said bed-plate. and carrying a looptaker 42. Upon the rear end of the shaft 0 38 is secured a belt-driven pulley 43 operatively connected by a belt 44 with a beltdriving pulley 45 carried by the main shaft.

Said belt driving and driven pulleys are of the ratio'of two to one, thus giving to the loop-taker two rotations to one rotation of said main shaft.

46 represents a sleeve loosely mounted on the shaft 38 and held against lengthwise movement thereon by collars 47 and 48, said sleeve having formed integral with it a b ear ing hub 49 upon which is pivoted one end of the loop-taker-actuating shaft link 50, the opposite end of said link being pivotally attached to the lower end of the loop-takeractuating shaft shifting lever 51 mounted to oscillate on a bearing stud 52 secured in the standard 3 and pivotally connected at its upper end with the shifting lever connection 53, which in turn is pivotally attached to the .80 needle-carrying frame connection 54, for retarding and accelerating the movements of the loop-taker. f a

' All of the foregoing parts are usually found in sewing mach nesof the present 85 class, and are herein'shownas best' representingone form ofconstruction to which .;the"present invention'is applicable.

55 represents an oscillating shaft mounted in a bearing formed in the bracket arm, and to its outer endis adjustably secured by a screw 56 a needle-bar-positioning arm 57 car-- rying at its freeend a spring plunger 58 adapted to enter openings 59, 59' and 59" formed in the bracket 60 to hold said shaft against accidental axial movement, said bracket being formed with a hollow hub 61 adjustably secured by screw 62 on a hub 63 forming a part of the bearing for the shaft .55. The inner end of the shaft carries an 50' integrally formed crank arm 64 provided 7 with .a bearing sleeve 65 in which is journaled an oscillating link adjusting shaft 66 onthe inner end of which is secured, by

. I screw '67, oneend of a link 68, its opposite 66 end receiving a threaded bolt 69 securedby a .nut 70, and on said bolt is fulcrumed one end of a link 71 whose opposite end is fulcrumed on a bolt 72 which passes through suitable bearings formed in the connections 60 54 and 53, amLis secured against lengthwise movement by the nut 73 and washer 74.

Upon the shaft 66 is suitably securedv a stop collar 75 provided with-arms 76 and 77,

the arm 76 being connected by a link 78 with 66 an arm79 of a two-arm lever 80 pivoted on a screw stud 81 threaded into the bracket arm, the arm 82 of said lever being connected with a rod 83 whose lower end is acted on by a suitable knee treadle (not shown) to rock the lever 80, at the will of the operator, in the direction indicated by the arrow 2?. A spring 84 acts on the bracket collar 85 secured on the shaft 66 to hold the arm 77 normally in engagement with one of the registering screws 86, 87 or 88, dependent upon the nature of the product required. As will be evident by reference to the drawings, the cam 37 imparts to the lever 54- under all conditions equal vibratory movements on both sides of an imaginary line connecting the shaft 35 with the pivot screw 89 corresponding with the mean lateral position of said lever, and the crank arms 64 and 68 are of substantially the same length as the swinging link 71. It therefore results that in any'of the positions of the angle lever 57-64, the rock-shaft 66, which positions spaced apart not only lengthwise of such lever but upon opposite sides of its mean position, thereby sustaining the fulcrum 69 in such manner that the latter is permitted to assume its extreme maximum throw position coaxial with the shaft 55 and in neutral position upon said imaginary line, between which extreme ositions it will so control the direction 0 movement of the link 71 that its pivotal connection 72 with the lever 54 will assume in each alternate movement one of its extreme positions corresponding with the maximum throw of the needle.

, In Figs. 1, 2 and 3, the needle-bar-controlling mechanism is shown in position to effeet the ordinary straight-away seam a arranged central with the amplitude of vibration of the needle, which is effected by an adjustment of the axis of the bolt 69 in line with the axis of the cam shaft 35 and pivot screw 89, the positioning arm 57 occupying its central position as shown in Figs. 3 and 4 and the free end of the arm 77 being in engagement with the registering screw 87. o eflect the zigzag seam b, the operator moves the rod 83 upward, which, through the connecting elements 80, 78, 76, 66 and 68', causes theaxis of, the bolt 69 to be moved out ofalinement with the axis of the shaft 35 and pivot screw 89, and transmits to the connection 54 movements in the di-- rection of its length and to the needle-bar lateral movements, it being understood that the extent of lateral movement given the needle-bar is controlled by the extent of vertical movement given the rod 83, and that the adjustment of the latter is effected at the will of the operator during, and without retarding, the stitching operation.

To locate the seam c with respect to the like seam a as illustrated in Fig. 7, the arm 57 is adjusted to register the spring-pressed plunger 58 in the opening 59', which causes the shaft 66 to be moved toward the front end of the machine sufficiently to bring the free end of the arm 77 in engagement with the registering screw 88, thus positioning the needle at the extreme left of its lateral movement, when the operator by manipulating the rod 83 causes the needle-bar to be moved laterally and effect the zigzag seam d in the same manner as the zigzag seam b. In Fig. 5 the dotted lines represent the adjustment of the connection 54 when stitching the seam a, and the full lines the adjustment of said connection when effecting the seam c. The seams e and f are effected in the same manner as the seams c and vi, respectively, except that the arm 57 is adjusted to register the plunger 58 in the opening 59", which causes the shaft 66 to move toward the rear end of the machine sufiiciently to bring the free end of the arm 77- into engagement with the registering screw 86,

thus positioning the needle at the extreme right of its limit of lateral movement, or for efi'ecting the seam e, when the operator by manipulatiiig the rod 83 causes the needle- 40 bar to be moved laterally, efiecting the seam f. In Fig. 6 the dotted line view of the connection 54 represents the adjustment. of the latter when forming the seam e, and the full lines the adjustment of said connection when efiecting the zigzag seam f.

What we claim is 1. The combination with a reciprocating and laterally movable needle of a vibratory and endwise movable lever, connected with and adaptedto impart to said needle lateral movements, means for vibrating said lever, a swinging link pivotally connected with said lever, a fulcrum for said link, means for moving said fulcrum in an arcuate path crosswise of said lever, and means for changing the position of said arcuate path of movement relatively to said lever.

2. In a sewing machine, the combination with a main-shaft, a needle vibrating cam operatively connected with said shaft, a

said needle vibrating cam, of an oscillating shaft journaled in astationary part of the sewing machine provided with a needle-bar positioning arm and connections including a shaft-crank and links located between said oscillating shaft and needle-bar carrying frame connection for positioning the needle in different lateral stitch-forming positions.

3. In a needle-controlling mechanism for sewing machines, the combination with a main shaft, a cam shaft provided with a needle-vibrating cam, a laterally movable needle-bar-carrying frame provided with a needle-carrying bar, a needle-bar-carrying frame connection pivoted at one end to said needle-bar-carrying frame, its opposite end being acted on by said needle-vibrating cam, and a needle-bar-positioning arm, of connections includin links whose axes are normally located III the same plane as the axes of said pivoted connection and cam shaft for operatively connecting said needle-bar-positioning arm with said needle-bar-carrying frame connection for controlling the stitchforming movements of said needle-bar in different lateral positions, dependent upon the nature of the product desired.

4. In a sewing machine, the combination with a main-shaft, a needle-vibrating cam operatively connected with said shaft, a laterally movable needle-bar carrying frame provided with a needle-carrying bar, and a needle-bar carrying frame connection pivoted at one end to said needle-bar carrying frame, its opposite end being acted on by said needle-vibrating cam, of an oscillating shaft held against accidental movement journaled in a stationary part of the sewing machine and provided with a needle-bar positioning arm, and connections including a shaft crank and links located between said oscillating shaft and needle-bar carrying frame connection for positioning the needle in different lateral stitch-forming positions.

5. In a sewing machine, the combination with a main-shaft, a needle vibrating cam operatively connected with said shaft, a laterally movable needle-bar carrying frame provided with a needle-carrying bar, and a needle-bar carrying frame connection pivoted at one end to said needle-bar carrying frame, its opposite end being acted on by said needle vibrating cam, of an oscillating shaft journaled in a stationary part of the sewing machine, provided with a needle-bar positioning arm and connections between said oscillating shaft and frame connection including a crank-arm carried by said oscillating shaft and provided with a bearing sleeve, a shaft journaled in said bearing sleeve, links operatively connecting said last named shaft with said frame connection for positioning the needle in different lateral stitch-forming positions.

6. In a Sewing machine, the combination with a main-shaft, a needle vibrating cam operatively connected with said shaft, a laterally movable needle-bar carrying frame provided with a needle-carrying bar, and a needle-bar carrying frame connection pivoted atone side to said needle-bar carrying frame, its opposite end being acted on by said needle-vibrating cam, of an oscillating shaft journaled in a stationary part of the sewing machine, a needle-bar positioning arm rigidly secured to said oscillating shaft, and connections between said oscillating shaft and frame connection including links adjustable in directions lengthwise 'of said frame connection for positioning the needle in different lateral stitch-forming positions.

7. In a sewing machine, the combination with a main-shaft, a needle vibrating cam operatively connected with said shaft, a laterally movable needle-bar carrying frame provided with a needle-carrying bar, and a needle-bar carrying frame connection pivoted at one end to said needle-bar carrying frame, its opposite end being acted on by said needle vibrating cam, of an oscillating shaft journaled in a stationary part of the sewing machine, and connections including a shaft crank and a shaft having movement about the axis of sald oscillating shaft for positioning the needle in different lateral stitch-forming positions.

8. In a sewing machine, the combination with a main-shaft, a needle vibrating cam operatively connected with said shaft, a reciprocating needle carrying bar provided with a needle, connections between the latter and said cam including a vibrating and endwise movable connection for transmitting to said needle lateral movements, of an oscillating shaft journaled in a stationary part 'of the sewing machine and held against accidental movement, and connections between said oscillating shaft and vibrating and endwise movable connection including an oscillating shaft crank and swinging links operatively connected therewith and j ournaled at one end upon a single fulcrum having swinging movements in directions corresponding to the vibratory movements of said vibrating and endwise movable connection.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribin witnesses.

EORGE M. EAMES. JOHN S. FINCH. Witnesses:

STANLEY N. SMiTH,

ABBm M. DONIHEE.

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