US2366648A - Rotary take-up for sewing machines - Google Patents

Description

' Jan. 2, 1945. 4 F, PARRY 2,366,648

ROTARY TAKE-UP FOR SEWING MACHINES Filed Sept. 3, 1942 Patented Jan. 2, 1945 UNITED ,STATES PATENT OFFICE ROTARY TAKE-UP MACHIN FOR SEWING ES Frank Parry,'Bridgeport, Conn., assigner to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey `Application September 3, 1942, Serial No. 457.1149 9 claims. (cl. 11a-24s) t l take-up member.

With these and other objects in view. as will hereinafter appear, the invention consists in the devices, combinations and arrangements of parts described in connection with the accompanying drawing, which illustrates a preferred embodiment of the invention and in which:

Fig. 1 is a front end elevation of the bracketarm head of a sewing machine containing the improved thread-'severing device.- Fig. 2 repre# sents an venlarged section of the rear take-up mechanism and taken substantially on the line 2--2 of Fig. 1, with the thread-severing element disposed in the .slot of the take-up member. Fig. 3 represents an enlarged section taken on substantially the line 3 3 of Fig. 1, with the takeup member advanced into substantially the position shown in-Fig. 2. Fig. 4 represents an enlarged View, partly in section, of the rear takeup mechanism as illustrated in Fig. 1, and shows the thread wound abnormally about the take-up member.

The present improvement has been embodied in a thread take-up mechanism corresponding in general to those disclosed in the U. S. patents of ,-tS. Zonis, No. 2,191,736, February 27, 1940, and No. 2,263,533, November 18, 1941.

The sewing machine in part illustrated in the drawing has a `frame including a bracket-arm head III. Journaled for vertical reciprocation' in the bracket-arm head I is a needle-bar II, carrying at its `lower 'end a needle I2; said needle- `bar being reciprocated by any usual or suitable actuating connections with a horizontally disposed main actuating shaft I3.

The main shaft I3 carries at one end thereof i a lmain or front take-up disk Il provided eccentrically of the axis of rotation of the shaft I3 with aA pair of radially equidistant thread-engagingstuds I5. The studs I5 carry a dat threadconiiningring I6 held spaced from the disk Il axially of the'main shaft Il.

the mam shaft n, the disk u and the tnrear.

engaging studs I5 perform one rotation for each complete reciprocation of the needle I2 and in a counterclockwise direction when viewed as in Fig. 1 of the drawing.

The thread-controlling mechanism. also includes a supplemental rear take-up device. A rotary shaft I'i is disposedparallel to 'the mainshaft I3 and is actuated as described in said prior Patent No. 2,191,736, or in any other suitable or preferred manner, to perform two rotations for each rotation of and in the same direction as the main shaft I3. Carried by the supplemental shaft I1 for rotation therewith is a primary thread-confining element in the form of a disk I8, which preferably is disposed in `substantially the same vertical plane as the front take-up disk I4.

Carried eccentrically by the supplemental takeup disk I8 to extend from a side face oi' said disk is a thread-engaging member I9 rotatable in an orbital path about the longitudinal axis of the shaft I1.. The'rnember I9 is somewhat elongated in its orbital path, being in general of kidney shape. In its side Iface opposite to the disk I8, the member I9, is provided between the radially outer and inner faces thereof with an arcuate slot 20, which is preferably concentric with the orbital path of the member I9. The slot '20 extends lengthwise throughout the member I9 so as to' be open at the opposite ends of said member. Depthwise, the slot 2li extends transversely of the side face of the disk I8 and also preferably extends across the effective thread-engaging width of the member I9, as limited by the disk I8. In effect, therefore, the slot20 divides the member I9 into two separate members extending from the disk I8 and spaced from each other on a common radius. concentric and coplanar thread-confining iiat rings 2I and 22 are spaced axially from the-disk I8; said rings being spaced from each other to provide therebetween a circular severing-element clearance slot 20' constituting a continuation oi the thread-engaging member slot 20. The rings 2| and 22 are carried by the outer end of the member I9 so as to bedisposed coaxial with the disk I8.

Attached to the bracket-arm head Ill, by screws as 2i, is a face-plate 24 which is provided between the front and rear take-up devices with a threadconfining plate 25 suitably secured upon the faceplate 24. The plate 25 has reversely curved opposite side edges disposed in proximity to the orbital paths of the front take-up studs I5 and Being carried by Il the rear take-up member I9.

suitably secured to the lower portion of the plate 2l and held separated therefrom by a spacer-plate 24 is a supplemental thread-confining plate 21 shaped similarly to the plate 23. The spaced upper portions of the plates 25 and 21 provide therebetween a thread-clearance slot 23.

The supplemental plate 21 is provided in its outer face opposite to the spacer-plate 23 with a recess 29; said recess forming a seat for the shank n of a thread-severing element 3|. The

` severing-element shank 3l has an enlarged aperture 32 to receive a securing screw 33 threaded into the plate 21; said aperture permitting limited endwise adjustment of the shank 3l in a direction substantially radially of the orbital path of the thread-engagingY member I3. The severing-element 3| is bent so that it extends substantially normal to its shank 30' and into the thread-engaging member slot 2U in a direction transverse tothe orbital plane of the member The severing-element 3| has a thread-cutting edge 34 at the side of said element first approached by the thread-engaging member Il in the rotation of said member, and the member Il is preferably provided lengthwise of its radially outer face with a thread-receiving groove I.

The two take-up devices are partly covered by a guard-plate ,3l having an'inwardly extending peripheral ilange 38 directed toward and spaced from an outwardly extending peripheral ilange z 31 of the face-plate 24; said anges 34'and 3'Iv providing therebetween a thread clearance.

Supported upon the outer face of the guardplate 35, adjacent the thread-severing element 3|,

are divergently extending arms 38 and 38 secured by a screw 4I) for angular adjustment relatively 'to each other. The arm 33 carries a bent thread-A supporting and -deilecting element or finger 4I which has its free end portion extending through the centralopening of the thread-confining ring n 22 transversely of and at an inclination to the orbital plane of the member I3 to terminate in llingers 4| and 43 being respectively disposed fore and aft of the substantially constant point in the orbital path of the member I9 at which an abnormal winding of thread about said member is severed.

The needle-thread t extends from the conventional tension-device 44 about a thread-controlling guide 45 from which the thread passes upwardly and forwardly to overlie the thread-controlling member I9 of the rear take-up and the thread-engaging studs I5 of the front take-up in the'lead of the thread'to the needle I2.

As the free end portions of the thread-deflecting fingers 4|y and 43 are disposed inside the orbital path of the thread-engaging member I9 in the region of the thread-severing element 3 I, the slack thread given up by the member VIii is normally supported by said ilngers and prevented thereby from engaging said element 3l.

It is self-evident that so long as the take-up element I8 remains entirely below the thread t,-

whether or not the thread is broken between the take-up and the work, the thread cannot windl about the member Il, even inthe absence of the lingers 4I and 43. However, it may happen in the event of thread-breakage that a bight of the loose thread-is thrown in advance of the take-up member I9, whereby said member I9 gets on top of the thread. The thread thereupon starts abnormally to wind about the member I0, as illustrated in Fig. 4 of the drawing.

In winding clrcumferentially about the member Il, the coils of thread necessarily pass across the leading end of the slot 20. As the threadsevering element 3| traverses the slot 20 in each rotation of the take-up member, the thread extending across the leading end of the slot 20 is severed by the cutting edge 34 of the severing 'element 3|.

position of the element 3| is not critical. In fact,

it is not vital to have the edge vof the severing element 3| sharpened, because the-thread when wound about the member I8 will inevitably be broken by the element 3|.

The thread-supporting and -deilecting iinger 4I is disposed slightly in advance of the threadsevering element 3| in the direction of approach of the member II to the severing element 3|. In the normal operation of the machine, the finger 4| opposes movement of slack thread into a position wherein it might be carried by the mem-ber I9 into engagement with the severingelenent 4|. When the thread is abnormally f wound about Vsaid member I3, as illustrated in Fig. '4, the thread is partly wrapped about the linger 4I Just prior to severing of the thread by the element 3|. Owing to the inclination of the finger 4| with respect to the orbital plane of the member I3 and the direction of rotation of said member as indicated by an arrow in Fig. 4, the

linger 4I tends to force the thread outwardly As the thread is severed away from' said plane. during this outward movement thereof along the finger 4|, the severed length of thread is thrown outwardly away from the take-up. 'Ihe finger 43 is not only complemental to the finger 4I in normally supporting the slack thread Afree of the severing-element 3|, but it also assists in throwing the severed end of the thread away from the take-up, by reason of the outward convergence of the lingers 4| and 43.

A Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, a thread take-up dev ice comprising, a disk rotatable about a fixed axis, a thread-engaging member extending from a side face of said disk eccentrically to said axis,

said member being provided with a severingl element clearance slot extending depthwise transversely of said face of said disk, thread-confining means carried by said member in laterally spaced .relation to said disk, and a thread-severing ele- 'inent disposed to'traverse said slot in the rotation of said member.

2. In a sewing machine, a thread take-up device comprising, a, disk rotatable about a fixed axis, a thread-engaging member extending from a side face of said disk eccentrically to said axis, said member being provided with a severingelement clearance slot extending depthwise transversely of said face oi said disk, radially spaced and concentric thread-confining elements carried by said member in 'laterally spaced relation to said disk, said elements providing between them a clearance slot in circular alinement with the slot of said member, and a stationary threadsevering elementdisposed to traverse said slot in the rotation of said member.

3. In a sewing machine, a thread take-up device i comprising,` a disk rotatable about an axis, a

thread-engaging member carried by and extending laterally from said disk eccentrically to the axis of rotation of said disk, said member being provided with a severing-element clearance slot lengthwise extending in the orbital path of said member and depthwise extending transversely of a side face of said disk, a pair of substantially 4fiat and coplanar rings oi diierent diameters carried by said member in spaced relation to said disk, said rings being concentric with said disk and being spaced. from each other to provide therebetween va clearance 'slot in circular alinement with the slot of said member, a stationary threadsevering element disposed to traverse said slot in the rotation of said member, and supporting means for said element.f

. 4. A thread take-up mechanism Iorsewing machines, comprising, a thread-engaging member. having an orbital-path of rotation and about which member the thread may abnormally wind, thread-severing means associated with said member forV severing the thread when abnormally wound about.. said member, and a stationary thread-supporting and -deecting element extending across the orbital plane and within the path of rotation of said member, said element bthe thread away from said plane.

5. A thread take-up mechanism for sewing machines, comprising. a thread-engaging take-up member having an orbital path of rotation and about which member the thread may abnormally wind, thread-severing means associated with said 6. In a sewing machine, the (combination with a thread-engaging take-up member having an -orbital path of rotation and about which member orbital path for. severing thread abnormally wound about said member, of stationary threadsupporting and -deectlng fingers` extending across the orbital plane and within theV orbital path of rotation of said member, said fingers being disposed fore and aft of said point and being convergent in a direction away from said plane. 7. In a sewing machine, the combinationwith a thread-engaging take-up member having an orbital path of rotation and about which member the thread may abnormally wind, and means effective at a substantially constant point `in said orbital path for severing thread abnormally wound about said member, of stationary threadsupporting and -deilectingI fingers extending across the orbital plane andwithin the orbital path of rotation of said member, said fingers being disposed fore and ait of said point'and being "convergent in a direction away from said plane.

and supporting means providing for 'adjustment of said ngers relative to each other.

ing inclined to said planein a direction to deflect 8. A thread take-up device for sewing machilies', comprising, a disk, a member carried by and extending laterally from said disk eccentrically of theicenterof said disk, said member being provided in its side tace opposite to said disk with a slot lengthwise extending circumferentially of said disk, said slot extending depthwise transversely of a side iace of said disk, and a; pair of substantially flat and coplanar rings carried by said member at opposite sides of said slot.

9. A thread take-up device for sewing machines, comprising, disk. a pair of members exmember for severing the thread when abnormally wound about said member, and thread-supporting and -deflecting rlngers disposed adjacentl said severing means and extending across the orbital plane and within th'e path of rotation of said member, said ilngers being convergent in a direction away from said plane.

tending laterally from said disk eccentrically of the center o1 said disk, said members being spaced centric rings carried by said members in spaced relation to each other'and to said disk.

. FRANK PaRRY.

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