US1466154A - Needle-jogging mechanism for sewing machines - Google Patents

Description

Aug; 28, 1923.

Original Filed March 15 1 918 INYENTUR.

@ZZZ JZa/af ATTORNEY Patented Aug. 28, 1923.

'UNI TE D STATES PATENT OFFHEE.

RALPH M. OF NEW YORK, Y., ASSIGNORITO B. 1W. SHARAF MACHINE CO OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

- NEEDLE-J'OGGING MECHANISM FOR SEWING MACHINES.

A pp1icationfi1ed March 15, 1918, SerialNo. 222,590. Renewed September 8, 1921. SerialfNo. 498,321.

T all whom it may concern:

Be it known that I, RALPH M. SHARAF, a citizen of the United States, and resident of the borough and county of the Bronx, city and State of New York, have invented certain new and useful Improvements in Needle-Jogging Mechanism for Sewing Ma chines, of whichthe following is'a specifica1 tion.

7 My invention relates to sewing ;machines of the type in which the needle in addition to its vertical reciprocating motion, also-has a lateral motion for the purpose of producing a zig-zag stitch. The object of my present invention is to provide a. very simple mechanism for obtaining this motion in such away that all the parts will be firmly supported and guided during their movement. 7 y

Referenceis to be had to the accompanying drawings illustrating a specific embodiment of my invention. 7 V

Figure 1 "s a side elevation of the improvement, with parts in section substantia-lly on line l1 of Figure 3;

Figure 2 is a corresponding front elevation, with parts in section substantially on line 2-=2 of Figure 1;

vFigures 3 and 4 are detail horizontal sections taken on lines 3- 3 and 4- 1respectively of Figure 2; and

t Figure 5 -is a diagrammatic view illustrating the-movement of the needle bar.

In the head or overhanging arm of the sewing machine, are journaled in axial alignment with eachother, but held against longitudinal movement, two sleeves 11 and 11, each having a cylindrical but eccentric bore in which the needle bar 12 is adapted to reciprocate up and down. As shown, the needle bar is provided at its lower end with a head or holder 12, carrying the rigidly vconnected needles 12", which prefer-ably op-- erate in different longitudinal planes with respect to the direction in which the'fabric is fed, saidfdirection being indicated by the arrows at the bottom of Figures 1 and .3.

Each ofthe sleeves llrand 11 is provided with a' spur gear 13, 13 respectively, in mesh with two pinions 14, 14; respectively, rigid on a vertical shaft 15 which is journaled in the arm 10. This connection is such that the two sleeves 11, 11' will be conipelled to turn in unison, always keeping the two eccentric bores in vertical alignment for the proper guidance of 'the needle bar .12 in every position of said sleeves. The simplest construction forthis purpose is to have the .two spur gears 13, 13 made alike, and similarly toh'ave the two pinions 14,1 1 alike, The sleeves'll, 11? are normally stationary, but between each two successive stitching operations of the needles, the sleeves are given a half revolution by means of a, 1

toothed sector 16, adapted to mesh with the spur gear 13, and secured to a disk or collar 17 which-is rigidi with the horizontalrshaft 17 located in the head of the machine, The number of teeth on the toothed sector 16-is just one halfof the'number of teeth on the spur gear 13.

The needle-bar is reciprooated vertically by means of a crank pin 18 on the disk 17, and a connecting rod 19 extending from said pin to a bossor slider 20, preferably formed integral with the said connecting rod, and guidedfor vertical movement in a slideway 110 of thehead or frame 10. As shown,'the' outer surface of-this boss Where it engages the slideway is cylindrical, or, broadly speaking, circular curvature in cross section, so that the boss may not only move up and down in the slideway 10, but also rock on its ownaxis. Vvithin this boss is 'located centrally a horizontalpin 21 fitted loosely into the boss and extending axially thereof, so that the boss can turn on the'pin and the pin can slide lengthwise, that is, horizontally within the axial bore of the boss. The outer, end of the pin 21 has a' transverse horizontal perforation enabling it to slide-upon a pin or screw 22 which is secured rigidly toa sleeve or collar22 fastened to the needle bar 12. The screw 22 may at the sametime serve as a fastening screw to clamp the collar 22 upon the needle bar. If r Any suitable mechanism may be provided to prevent accidental'turningof-the sleeves 11,; 11 at such times when the spur gear 13 is'not in mesh with the sect-or 16. As an exampleof. such mechanism, I have shown a rib 17 ofcircular curvaturerigid with the collar 17,-and located at that portion thereof which is not toothed,,said .ribada'pted successively' to engage a't its outer curved periphery the-concaved under side of; two pm jections 13', onthe spur gear 13 to lockthe lot when it is in mesh with the sector 16. p

as V

In view of the fact that the presser foot bar 23 comes quite close to the spur gear 13, it is preferable to arrange the shaft 15 and the pinions 14, 1 1 carried thereby, at the end of the arm 10; that is to say, the vertical axis of the shaft 15 will intersect the horizontal axis of the shaft 17 as will be evident from Figures 1 and 2.

The operation is as follows: The drawing illustrates the parts in a position at the end of a laterallmovement' of the needle bar in the direction of the arrow at the bottom of Figure 2, the needle bar being shown as having begun its downward stroke, and the needles being in the position indicated at a, corresponding to the position of the needle bar axis at b. The axis of the sleeves 11, 11 isdesignated by 0. The needles will continue their 'downstroke in this position, andwill also remain in the same line during the greater part of the following upstroke, and during thi time the rib 17 by its engagement with one of the projections 13", will lock the sleeve 11 against accidental turning, and this will also look the sleeve 11, owing to the connection effected by the pinio'ns 14, 14' and shaft 15. As the end of the upstroke is approached, the end of the rib 17 will leave the said projection 13 and thus free the spur gear 13, which is immediately engaged by the toothed sector 16 and given a half revolution. During this half revolution the needle bar axis will move in a path of cylindrical curvature, through an angle of 180, as indicated by the semicircle and arrow at (Z in Figure 5. The needle bar axis will thus be brought to the position b, and the needles to the corresponding position indicated by a in Figure 3, Since this lateral movementcis in the direction opposite to that indicated by the arrow in Figure 2, the distance between the needle bar and the boss or slide 20 will be increased, causing the pin 21 to be pulled outwardly within its socket in said boss, yet preserving the driving relation of these -parts. It will also be understood that as the needle bar moves through the semicircular or semicylindrical path above referred to,

the pin 22 will slide through the opening of the pin 21, thus again allowing the required freedom of movement while preserving the driving relation. The particular connection shown also has a further object and advantage, viz. to keep the needle bar in such a way that all the positions taken by the head 12 during the movement, will be parallel to each other. Thus when, as in the example illustrated, the vertical plane containing the two needles is perpendicular to thelin'e' of feed (indicated by the arrows at the bottom of Figures 1 and 3) this plane, while changing in position as the needle bar moves in its curved path, will always remain perpendicular to said line of feed,

thus preserving the proper relation of the needles to each other, and causing themto always face in the same direction. This result follows from the fact that the pin 22' is rigidly connected withthe needle bar 12, and that the construction described will com pel the said pin to remain parallel to its original position during the entire movement of the needle'bar. w

After the needles have performed a working stroke (downstroke) in the position a, their position will be shifted again to the position a toward the end of the'following upstroke, by a lateral movement in the direction indicated by the arrow in Figure 2. During this lateral movement, the needle bar axis will again move in a path of cylindrical curvature, through'an angle of 180, but instead of being in the same are as before, this return movement will be through the complemental are indicated by the semieircle antl arrow d in Figure 5. The two arcs (Z, (Z together form a complete closed curve (circle), and the arrows indicate that the movement of the needle bar axis around the stationary center or axis 0 is in the same direction on both arcs (clockwise in the particular case illustrated). It will be obvious that each of the needles will perform a 'rotary movement about axes removed from their own axes of exactly the same'character as described with respect to the needle bar and illustrated by the circle d, d in Figure 5. I a

With the crank pin 18 located at the cen tral portion of the toothed sector 16, j as shown, the lateral shifting of the needles will take place partly at the end of the upstroke of the needle bar and partly at the beginning of the immediately following It will, however, be underdownstroke. stood that this exact arrangement is not essential, and that the lateral movement may be timed to occur at other stages of the vertical reciprocation of theneedle bar, as long as such lateral movement is made to take place at a time when the needles have been raised suificiently to clear the fabric. 7 i I It will be understood thatif on one working stroke the needles enter the 'cloth in the position a, on the next working stroke they will occupy the position a, and so on in regular alternation. r 1 While I have illustrated and described a preferred and satisfactory embodiment of my invention, it is obvious that changes may be made therein within the spirit and scope thereof, as defined in the appended claims. Particularly, I do not wish to restrict myself to the provision of a plurality of needles on the same needle bar.

I claim 1.'In a sewing machine, a needle bar,

means rotatable in a closed path supporting said bar, means operatively connected with said supporting means adapted-to move said supporting means to shiftthe needle bar laterally in amovement which shifts the axis of said needle bar in the same direction in'a closed path, and means adapted to reciprocate said needle bar longitudinally to perform stitching operations at different points bore, said sleeve being rotatable about said bar, and means for turning'said sleeve to shift the needle bar, said needle bar being non-rotatable about its own axis.

v 3. Ina sewing machine, a frame, a cylindrical member mounted to turn about its own axis relatively to said frame but held against longitudinal movement, and provided with a cylindrical guide surface eccentric to the turning axis; of said'memb'er, a longitudinally reciprocating needle bar having a cy lindrical guide surface in engagement with said eccentric guide surface, and means for turning said member to shift the needle bar.

4. In a sewing machine, a frame, a member mounted to turn relatively to said frame but held against longitudinal movement, and provided with aneccentric cylindrical guide surface, a longitudinally reciprocating needle bar having a cylindrical guide surface in engagement with said eccentric guide surface, and means for giving said member a half revolution between each two successive stitching operations, to-shift said bar alternately to two different positions.

5. In a sewing machine, a frame, a member mounted to turn relatively tov said frame but held against longitudinal movement, and provided with an eccentric cylindrical guide surface, a longitudinally reciprocating needle bar having a cylindrical guide'surface in engagement with said eccentric guide surface, and meansfor giving said member a half revolutionbetween each two successive stitching operations, to shift saidbar alter; nately to two difierent positions, and means for holding said member against turning during the periods intervening between the shifting movements of the needle bar.

6. In a sewing machine, a needle non-rotatable about its own axis, means adapted to reciprocate said needle longitudinally, means adapted to shift the axis of said needle in one direction in a closed path, and means adapted to causesaid movementito take place intermittently alongsaid'path to cause successive working strokes'tooccur at different points of said path. a

7. In; a sewing machine, a-needle non-rotatable about, its own axis, means for reciprocating said needle longitudinally, and means for completely revolving said needle about anaxis removed from the axis ofsaid needle; 3" I 8. In a sewing machine, a needle bar non rotatable about its own axis, means for re ciprocating said needle bar longitudinally, and means for imparting'rotary movement to'said needle bar in one direction in a closed path about" an axis removed from theaxis of said needle bar.

9. In a sewing machine," a needle bar non-. V

rotatable about its own axis, correlated means adapted to reciprocate said needle bar longitudinally, and "revolve said needle bar intermittently in one direction about an axis removed from its own axis, and adapted to cause a plurality of 'reciprocations to a complete revolution of saidneedle bar. I

10. In a sewing machine, a needle bar 'non-' rotatable about its own axis, means adapted to reciprocate said needle bar longitudinally, means adapted to shift the axis of said nee dle bar in onedirectio-n in a closed path, anda plurality of needles carried thereby and sharing its reciprocating and shifting movements, said needles being out of line with'respect to; the direction in which the fabrictravelsf p i 11. In a sewing machine, a frame, a cylindrical member mounted to turn'rel'atively to said frame but held against longitudinal movement, and provided with a guide surface eccentric to the turning axis of'said member, a longitudinally reciprocating nee dle'bar having a guide surfacein engagement with said eccentric guide'surface, a toothed gear held to turn with, saidmember, and an actuating gear adapted to turn said first-named gear periodically, and thereby shift the needle bar. 1

12. In a sewing machine, a frame, a member mounted to turn relatively to said frame but held against longitudinal movement, and I provided with an eccentricguide surface, a longitudinally reciprocating needle bar having a guide surface in engagement with said eccentric guide surface, a toothed gear held to-turn with said member, and a rotary actuating organ having a toothedjsector for turning said gear and member periodically and also having a connection for imparting a longitudinal reciprocating movement to the needle bar.

13. In a sewing machine, a frame, a cylindrical member mounted to turn relatively to I said frame andprovided with a guide surface eccentric to the turning axis of said member, a longltudlnally reciprocating needle bar having a guide surface in engagement with said eccentric guide surface, a rotary actuating organ, a slide connected with said organ to receive a reciprocating motion in the same direction as the needle bar, said slide being held'against lateral movement, means'for turning said member, whereby, the distance between the needle bar. and said slideis varied, and a self-adjusting operative connection permitting relative lat-. eral movement between the needle bar and said slide.

H. In a sewing machine, a frame, a member mounted to turn relatively to said frame and provided with an eccentric guide sure face, a longitudinally reciprocating needle bar having a guide surface in engagement with said eccentric guide surface, a rotary actuating organ, a slide connected with said organ to receive a reciprocating motion in the same direction as the needle bar, means for turning said member, whereby the distance between the needle bar and said slide is varied, and a. self-adjusting operative connection between the needle bar andsaid slide, said connection comprising a pin carried by said slide and slidable with refer ence thereto toward and from the axis of said member, and another pin carried by the needle bar and extending transversely of the first-named pin, and in sliding engagement therewith.

15. In a sewing machine, a frame having aslideway, a cylindrical member mounted to turn relatively to said frame and provided with a guide'surface eccentric to its turning axis, a needle bar arranged to reciprocate longitudinally in a direction parallel to said slideway and having a guide surface in engagement with said eccentric guide surface, a rotary actuating organ, a connecting rod operated by said organ and provided with a portionarranged to slide and rock along said slideway, said portion being held against lateral movement, and a: self-adjusting operative connection permitting relative lateral movement between said connecting rod portion and the needle. bar.

16. In a sewing machine, a frame, two

axially aligning members mounted to rotate relatively to said frame and each provided with a guide surface eccentric to their turning axes and. rotatable therewith, a l0ngi tudinallyreciprocating needle bar non-rotatable about its own axis having guide surfaces in engagement withjsaid eccentric guide surfaces, and means for rotating said members about their own axes in unison to.

shift the needle bar.

17. In a sewing machine, a frame,.two

axially aligning members mounted to turnrelatively to said frame and each provided with an eccentric guide surface, a longitudinally reciprocating-needle bar having I guide surfaces in engagement with said eccentric guide surfaces a toothed gear on each of said members, a connecting shaft having pinions in mesh with saidgears and compelling them to-turnin unison, and a driving gear for actuating one of said toothed gears periodically. y 7 18. In a sewing mach'ne, a frame, a cylindrical member movably monnted in said frame and provided witha guideway, a needle bar non-rotatable about its own axis mounted to reciprocate longitudinally along said guideway, and means formo-ving said member relatively to the frame about its own axis to shift the needle bar laterally.

19. In a sewing machine, a frame, two

cylindrical members movably mounted in said frame and provided with co-axial' guideways, a needle bar non-rotatable about its own axis mounted to reciprocatelongitudinally along said guideways, connecting mechanism for causing said two members to move in unison about their own axes, and means'for actuating one of said members to shift the needlebar laterally. v

20. In a sewing machine, a frame, a cylindrical sleeve mounted to turn therein, and

provided with a cylindrical boreeccentric to movement to said needle-bar in, one direction in a closed path'about an axis removed from the axis of said needle bar.

In testimonythat I claim the foregoing-as my invention, I have'sig ned my name.

RALPH M. SHARAF.

cating said needle bar longitudinally, and means for imparting intermittent rotary

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