US1141092A - Stitch-forming mechanism for sewing-machines. - Google Patents

Description

W. N. .PARKES'. STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT 8, 1905.

1,141,092. Patented May 25, 1915.

4 SHEETSSHEET l- W. N. PARKES.

STITCH FORMING MECHANISM FOR SEWING MACHINES.

v APPLICATION FILED SEPT- 8, 1905. 1,141,992.

Patented May 25, 1915.

4 SHEETSSHEET 2.

INVENIOR W. N, PARKES. STITCH FORMING MECHANISM FOR SEWING MACHINES APPLICATION FILED SEPT-811905- 1,141,092. Patented May 25, 1915.

4 SHEETS-SHEET 3.

w. N. PARKES. STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT- 8, I905.

Patented May 25, 1915.

' 4 SHEETS-SHEET 4.

. ED STATES WILLIAM N. PARKES, F BROOKLYN, NEW

COMPANY, OF NEW YORK, N. Y.,

YORK, ASSIGNOR TO THE PARKES MACHINE A CORPORATION OF NEW YORK.

STITGH-FORMING MECHANISM FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, WILLIAM N. PARKns, a citizen of they United States, residing in Brooklyn, county of Kings, and State of New York, have invented a new and useful Improvement in- Stitch-Fo-rming Mechanism for Sewing-Machines, of which the following is a description.

This invention is intended for use in the class of sewing machines in which the needle" is reciprocated in the direction of its length, and moved laterally at right angles to said .direction, and it is disclosed in connection with a rotary looper mechanism of a lock stitch type.

The main object is to provide a stitch forming mechanism, for this type of machines, in which the cooperative relations between the various elements of which it is composed are maintained inthe difierent lateral positions of loop engagement.

When the well known differential movement is used the hook is revolved once to each thrust of the needle, and its speed is accelerated so that it is substantially doubled during loop engagement, and when the well known plurality movement is used rapid loop engagement is secured by revolvmg the hook twice to each thrust of the needle, under which movement the hook has one idle rotation.

In order to make lateral stitches without moving the material laterally, means are provided for moving the needle laterally, and when this element is incorporated in a stitch forming mechanism, it causes a dis placement between the hook and the other elements of the stitchforming mechanlsm.

For example-in this kind of machines the when it moves in an opposite direction.

In machines of the prior art known to applicant, the movement of the needle laterally relative to the hook causes horizontal, and vertical displacements between the hook and theneedle as is well known.

In sewing machines the feed, take-up and hook, are timed to act relative to the vertical movements of the needle, and when the needle ismoved laterally without changing Specification of Letters Patent. P t t d May 25, 1915, Application filed September 8, 1905. Serial No. 977,633.

x i 1 1 its position/vertically, it is obvihus that t e relative timing between. the movements the feed take-up and needle is not Idistairhed,

but the timing between these elements and the hook is disturbed. I

' he take-up is timed to act with the hook, an especially in relation to the glijc harge of the loop by the same. Loop disx'inences after the hook has made a little over one half of a revolution from the point of loop taking, and the action'of the take-up is timed to commence to draw up the loop at the time the hook commences to discharge the same. To-theextent that the needle is moved laterally in the same direction as that in which the beak of the hook moves, the dis, charge of the loop relative to the movement of the take-up and the feed, is retarded, and vice versa.

Referring to the drawings; Figure 1 is a front elevation partly in section, showing the invention applied to the stitch forming mechanism of a sewing machine, and Fig. 2 is a rear elevation of saidmachi'ne; Fig. 3 a face view of thehead of. the machine with parts removed, and Fig. 4=is a vertical sectional view showing detailsof construction in connection with the needle bar; Fig. 5 is a top plan view of the invention, including a part of the hook mechanism; Fig. 6 is an arge comendview on line H of Fig. 5, and looking vention is to maintain the relation vertically between the eye of needle 'andthe-heak of the hook, so as to accomplish theresnit indicated in Fig. 8. This result is accomplished, in the present, form of my invention byzrotating the hook twice to each thrust fifths needle in such a manner, that it is automatie cally kept in time with the vertical move ments of the needle in the different lateral positions of loop engagement.

In sewing machines the hook is said to be timed faster when it is adjusted forward on its bearings, and slou er when it is adjusted in a directionopposite to its forward move- I ment. That is to say. when the hook is adjusterl circularly relative to the hook shaft and-in the same direction-in which said shaft revolves, it is timed faster relative to said shaft and also faster relative to all other necessary to adjust the hook in time with said other parts. Moving the needle later-- ally relative to the hook puts the hook out of time with theneedle and all other parts of the machine, but does not disturb the timing,

of said other parts. This will be understood when it is remembered that all parts are timed to act relative to the vertical movements of the needle, and the movement of the needle laterally does not'change the time of its vertical movement relative to said other parts. But changing the needle laterally does change its position. relative to the hook at point of 100 engagement, because as before noted the ook has to move farther to reach the needle in second loop taking position than in the first and vice versa,

In my invention the function of keeping the position of the eye of the needle relative to the beak of the hook, the same in the different lateral positions of loop engagement is accomplished by automatically timing or adjusting the hook faster as the needle moves laterally in the direction in which the-hook moves, and slower as the needle moves in the opposite direction.

In the-drawing, 1 indicates the arm of the machine, 2 the base, 3 the upperor drive shaft, 4 the lower or driven shaft.- The movement'of the drive shaft 3 is transmitted to the lower shaft 4 by means of a sprocket wheel 5 mounted on the drive shaft, and a sprocket wheel 6 mounted on the driven shaft, and a chain 7 is in engagement with said sprocket wheels, the sprocket wheels are of equal diameter, so. that the upper and lower shafts revolve in unison with each other. The driven shaft 4 may be driven in any usual manner.

In suitable bearings in the face of the machinefis located and free to turn a needle bar 8, on which is mounted a part 9, in which the bar is also free to turn, the said part 9 has formed on it t stud 10, on which a bearing 11 formed onthe lower part of a link 12 is mounted. On the upper end of said link 12 is formed a bearinglB which is pivoted on a crank pin 14, located in a usual manner in the outer end of a usual take-up cam 15 whichlatteris attached to the driving shaft 3 of the machine. Collars 16 and -17 which are attached to the needle bar 8 means for retaining the part 9 from turning with the needle bar 8 as well as connecting the link 12 with said bar.

To the bar 8, is attached an arm 19, in

said bearing by a collar 24, the part 22 being freeto turn on the s; 'd part 23. A pitman 25 is by means of a ball joint connection 26 connected at one end to the arm 21, and at its other end, adjustably connected in a way 27 formed in a usual segment lever 28, which latter is attached to a shaft 29. The seg ment lever 28 is operated by means of a usual switch cam 30 which latter is mount ed on the shaft 3 of the machine. To the lower end of the needle bar 8is attached an Offset needle holder 31 which carries a needle 32. A take-up 33 is operated in a usual manner by means of the take-up cam 15.

It will now be understood that by the means just described the-needle bar is reciprocatedvertically and oscillated laterally on its vertical aXis,-and that when so oscillated the needle 32 is moved laterally about the axis of the needle bar. Theswitch cam 30 is constructed so as to move the needle laterally once to each reciprocation of the same,.and these partsare so timed that the needle is moved laterally during the time it is disengaged from the Work. By adjusting the end of the pitman 25 in the way 27 toward the pivot of the lever 28, the extent of lateral movement of the needle is decreased and vice versa, and when the lever 25 is adjusted directly over the axis of the shaft 29 theneedle has no lateral movement and the stitch-forming mechanism under such adjustment is adapted for plain straight way stitching.

In a suitable bearing as shown in Fig. 1,

a short shaft 33. is mounted to turn, said,

shaft having a reduced portion 34 which is located in the forward end of the shaft 4, and to the free end of said shaft 33 'is attached a bevel gear 35 which meshes with a like gear 36, the latter being attached to a short vertical shaft 37 which is mounted in suitable hearings in the machine. To the upper end of the short vertical shaft 37 is attached a hook 38,'on which is formed a beak 39. This hook may be constructed in any usual manner.

. On suitable bearings at 40 is pivoted. a yoke lever 41, having a yoke portion 42, in which are secured pins 43, on which are pivoted -anti-friction rollers 44. These'rollers 44 are located in-a circumferential groove 45 formed in a sleeve 46, the latter being located so as to embrace the ends of the. shafts 4 and 133 as shown in Figs. 1 and 7.

In the sleeve 46 is-formed inclined slots 47 and 48. which incline in opposite directions as shown in Fig. 5, on the opposite side of the sleeve l6 are formed inclined slots (not shown) which are coincident with the slots 47 and 48. On pins or other suitable bearings 4:9 and 50, suitable rollers are pivoted to engage the respective walls of the slots a7 and 48, pin 50 is located in shaftd and pin l9 in shaft 33", and the difplibate of these pins and rollers are located in the grooves or slots (not shown) in the opposite side of the sleeve 46.

To do rear end of the short transverse shaft 29 is attached a segment lever 51, in which is formed a way or groove In the said groove 52 is connected at 58, one end of a link 54, the other end of said link being connected at to a lever 56, .which latter is connected at 57 to the vertical portion. of the arm of the machine. To the lower end of the lever 56, is pivoted at 58, in any suitable manner, a link connection 59, the forward end of said link connection is pivoted at to the end of the yoke lever 41.

The axis-of the hook 38 is located concentric with the needle bar 8, and the needle moves in a path laterally concentric with said axis, as shown in Fig. 5. The hook 38 is adapted to carry a bobbin case which is omitted in Fig. 5 of the drawing.

The eye of the needle in sewing machines runs transverse to the needle and said loop is thrown out laterally, with respect to the longitudinal axis of the needle across the path of the beak of the hook, by referring to Fig. 5, it will be understood that, the loop of needle thread will extend across the path of the beak of the hook the same, relative to said beak, in any ofthe lateral positions of the needle, and as the needle moves laterally in a path concentric with the path of the beak of the hook, it is seen that there are no unfavorable conditions horizontally in this stitch-forming mechanism, byreason of the lateral movement of the needle.

The means by which the relation between the needle and the hook horizontally are maintained, are not per se, claimed in this application, but the combination of my present invention with these-means are claimed.

The operation of the invention will now be described: The end of the link 25, is adjusted in the way 27, so as to produce the desired extent of lateral movement of the needle. Thesegment lever 51 being secured to theoscillating shaft 29, it, the said segmentlever, is moved laterally in unison with. the segment lever 28. To cause the loop engaging position of the beak of the hook or locper to change circumferentially or "laterally the extent the needle is changed ,laterally,

the end of the link 54: is adjusted in a direction away from the pivot of the lever 51, a sufiicient extent to transmit lateral movement enough to the sleeve 46 for the purpose. Assuming that the parts first to second loop taking position, or'Ti position shown in dotted lines in Fig. 8. This movement of the lever 28, causes the lever 51 to move toward the forward end of the machine, and this movement is transmitted to the connection 54, and through it to the le-' ver 56, and from the latter to the connec .tion 59, which is moved toward the rear end of the machine; the movementof this connection swings the yoke lever 41 on its pivot, and through the connection between it, and the sleeve 46 such sleeve is also moved toward the rear of the machine. .As the sleeve 46 is moved toward the rear end of themachine, the engagement of the rollers in the inclined slot 47, causes the sleeve to rotate relative to the shaft 4, and the engagement between the rollers 49 and the inclines d8, causes the shaft 33* to rotate relatively to the sleeve 46,-the extent these slots are inclined, determines of course the extent the sleeve will turn relative to the shaft 4, and the shaft 33", relative to the sleeve. By this use of double sets of slots inclined in opposite directions, the shaft 33* is caused to rotate relative to the shaft 4, twice the extent of the incline of the slots' The gear 35 being twice the diameter of the gear 36, the movement produced by the inclined slots 47 and 48, is doubled when it reaches the hook. The dottedposition of the beak of the hook in Fig. 8, indicates the change in the adjustment or in the timing of the hook under the operation of the mechanism just described, when the needle is moved from first to second loop taking position. It will be seen that the hook has been automatically timed or adjusted forward, so that its beak reaches loop taking position relative to the eye of the needle, just the same as in first loop taking position, and when the needle is moved from the first loop taking position, it is of course understood that movements, the reverse of those just described take place, that is, the hook is automatically timed or adjusted slower, and con-- theheak of the hook, as

llO

sequently, the loop taking conditions becharge may as usual commence after the hook has rotated a little over one half around from second loop taking position, and that therefore the hook is in time with the take-up, the same as though no lateral movement had been given the needle, and this condition prevails of course, when the needle moves from second to first loop taking position.

It is thought that it is now understood that means are provided, by which the rela' tion between the point of the hook and the eye of the needle vertically is maintained in any of the lateral positions of loop taking; that the time or adjustment of the hook is automatically changed so as to accomplish this result, and that said automaticchange mechanism, as it is evident that the inven- I tion may be applied to other parts of the machine. y 7

Having now described my invention, what I claim as new is v 1. In a sewing machine, stitch forming mechanism comprising, in combination, a looper, a. reciprocating needle, adjustable meansto vibrate said needle laterally between any selected paths of reciprocation within a field of vibration, which said paths of reciprocation intersect different points in the looper-beak path, and'means automati-cally varying the operations of the looper and needle with respect to each other for forming substantially the same Width of loop and in the same relation to the looper, in all the lateral positions to which the needle may be vibrated.

2. In a sewing 'machine, stitch forming mechanism comprising, in combination, a

looper, a reciprocating needle, adjustable means to vibrate said needle laterally between any selected paths of reciprocation within a field of vibration which said' paths of reciprocation intersect different points in the looper-beak'path, and means efiecting cooperation of the looper-beak and the needle at substantially uniform time in the cycle of machine-operation and with substantially the same relation between the eye of the needle and the looper-beak, in all the different lateral positions to which the needle may be vibrated.

8. In a sewing machine, stitch forming mechanism comprising, in combination, a

looper rotating unidirectionally, a needle vibrating laterally between different paths of reciprocation intersecting points in the looper-beak path at different-degrees about the center of rotation of the looper, and means effecting cooperation .of the needle and the looper-beak, in the-different lateral positions of the needle, at substantially uniform time in the cycle of machine-operation.

4. In a sewing machine, stitch forming mechanism comprising in combination, a looper, a needle vibrating laterally between paths of reciprocation which intersect points in the looper-beak path at different degrees of cyclic progression of the looper, and means eifecting cooperation of the looperbeak and the needle, in the different lateral positions to which the needle is vibrated, at substantially uniform time in the cycle of machine-operation, with substantially the same relation between the eye of the needle and the looper-beak, and after substantially uniform withdrawal of the needle-eye toward the looper-beak path.

5. In a sewing machine, stitch forming mechanism comprising, in combination, a looper rotating unidirectionally, a needle, adjustable means to vibrate said needle laterally between any selected paths of recipre cation within a field of vibration, which said paths of reciprocation intersect dif ferent points in the looper-beak path, and means effecting cooperation of the looperbeak and the needle, in all .the different lateral positions to which the needle may be vibrated, at substantially uniform time in the cycle of machine-operation, with substantially the same relation between the eye of the needle and the looper-beal and after substantially uniform withdrawal of the needle .eye toward the looper-beak path.

6. In a sewing machine, stitch forming mechanism comprising, in combination, a e.

looper, a needle, adjustable means to vibrate said needle laterally between any selected paths of reciprocation within a field of vibration, which said paths of reciprocation intersect different points in the looper-beak path, of means wherebysaid looper and the eye of the needle cooperate at substantially the same time in the cycle of machine-operation and the distance along the needle between'the'needle eye and the looper beak is the same at the time of cooperation, in

all the lateral positions to which said needle may be vibrated.

7. In a sewing machine, stitch forming mechanism comprising, in combination, a looper, rotating unidirectionally, a needle, adjustable means to vibrate said needle laterally between any selected paths of reciprocation within a field of vibration, which said paths of reciprocation of the needle intersect different points in the looper-beak path, and means whereby said looper and the eye of the needle cooperate at substantially the same time in the cycle of machine operation and the distance along the needle between the needle eye and the looper-beak is uniform at the time of cooperation, in all the lateral positions to which the needle may be vibrated.

8. In a sewing machine, the combination of a looper, a needle, adjustable means to vibrate said needle laterally between selected paths of reciprocation which intersect dif ferent points in the loopenbeak path, and a take-up, said needle looper and take-up having the same .relative time of coiiperation in all the different lateral positions to which the needle may be vibrated.

9.'In 'a sewing machine, the combination with a unidirectionally rotating looper, a needle, and means to vibrate said needle laterally between paths of reciprocation which intersect different points in the looper-beakpath, of compensating mechanism effecting cooperation of the looperbeak with the needle at substantially uniform time in the'cycle of machine-o iieration, said compensating mechanism controlled by the needle-vibrating means.

10. In a sewing machine, the combination with a looper. rotating unidirectionally, a rotating shaft, and a laterally vibrating needle-holder, of positive driving connections between said shaft and the looper and means acting on said driving connections to accelerate or retard the loopcr to effect cooperation between the loopor and the needle, in any of the paths of reciprocation of said needle, at substantially uniform time in the rotation of said shaft.

11. In a sen-ingmachine, stitch forming mechanism con'iprising, in combination, a ioopcr, a needle, means to vibrate said needle between different pa lbs of reciprocation intersecting the path of looper-bcak movement at (.li'licrcnt points in the latter and means for adjusting the range of vibration of said needle, of a takcaxp, and means for cll'octing cooperation of the looper and needle in uniform relation to the time of the takcup in any of the lateral positions of the needle.

12. In a sewing machine, stitch forming mechanism having a reciprocating needle, mechanism for moving said needle laterally, a continuously revolving looper, and mechanism for changing the time of rotation of said looper to maintain the coinicrating re lations between the same and the needle.

13. A stitch forming mechanism for a sewing machine comprising a laterally movsaid rotating shafts with. respect to the other rotating shaft whereby the cooperative relation between said needle and the hook is maintained in the lateral positions of loop engagement.

14. A stitch forming mechanism coinprising a needle and a hook, means for operating one of said elements comprising a shaft, :1 second shaft, a sleevemounted so that it engages each of said shafts, means whereby when said sleeve is moved laterally one of the shafts is rotated relative to the other, coiiperative connection between the hook and said second shaft and means for moving said sleeve laterally.

15. A sewing machine comprising a needle, means for reciprocating and moving said needle laterally, a looper adapted to coiiperate with said needle, means for revolving said looper a plurality of times to each thrust of the needle, a device for increasing and (lCl(-5{1Sl1lg.tll predetermined times the speed of rotation of said looper to maintain its cotiperative relations with the needle, and means for operating said device.

16. A. stitch forming mechanism for a sewing machine comprisinga vertically reciprocating needle adapted to be moved laterally, an operating looper that has a con tinuously-revolving movement, mechanism including a moving. part for moving the needle laterally and means intermediate said mechanism and the looper whereby the speed of rotation of the latter is automatically changed from the moving part of said mechanism. i

17. A stitch forming mechanism for sewing machines comprising a reciprocating needle, a shaft, a second shaft, a hook adapt ed to cooperate with said needle operated by said second shaft, a part in engagement with each of said shafts, a plurality of inclined grooves formed in said part, means carried by said shaft in engagement with said grooves. and means for moving said part longitudinally of said shafts. v

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

tVILL-IAM N. PARKES.

' Witnesses:

J. B. MGGIRR, WM. JV. Ksrcnnar.

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