US2554144A - Rotary take-up for sewing machines - Google Patents

Rotary take-up for sewing machines Download PDF

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Publication number
US2554144A
US2554144A US41472A US4147248A US2554144A US 2554144 A US2554144 A US 2554144A US 41472 A US41472 A US 41472A US 4147248 A US4147248 A US 4147248A US 2554144 A US2554144 A US 2554144A
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United States
Prior art keywords
thread
needle
take
breaking
rotary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US41472A
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English (en)
Inventor
Robert L Hoffmeister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Singer Co
Original Assignee
Singer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Priority to US41472A priority Critical patent/US2554144A/en
Priority to GB346/49A priority patent/GB656419A/en
Priority to GB347/49A priority patent/GB656420A/en
Priority to FR979751D priority patent/FR979751A/fr
Priority to AT175138D priority patent/AT175138B/de
Priority to AT176094D priority patent/AT176094B/de
Priority to CH281716D priority patent/CH281716A/de
Priority to CH285450D priority patent/CH285450A/de
Priority to DEP35271D priority patent/DE895402C/de
Priority to DEP35553D priority patent/DE820533C/de
Application granted granted Critical
Publication of US2554144A publication Critical patent/US2554144A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B49/00—Take-up devices, e.g. levers, for the needle thread
    • D05B49/04—Take-up devices, e.g. levers, for the needle thread rotary

Definitions

  • This invention relates to a needle-thread takeup for sewing machines, and more particularly to a rotary type take-up in which a pair of rotary elements having fixed axes of rotation are utilized to satisfy the thread-handling requirements of high speed, lock-stitch sewing.
  • the ability of the check-spring to recover from any one of its stressed or displaced positions in time to perform the next succeeding thread-controlling operation is directly proportional to the spring strength.
  • the use of a heavy check-spring necessarily involves the use of a heavy tension in order to discourage stealing by the check-spring of unwanted thread from the supply through the tension device.
  • the use of a strong check-spring and heavy tension in combination with a double rotary takeup is made possible by this invention which establishes a secondary thread-tensicning effect in the take-up itself, countering that of the regular tension device at specific intervals in the stitchforming cycle.
  • the secondary tension acts against the regular tension device to assist the take-up in pulling the required amount of thread through the tension device at the stitch-setting point, and simultaneously acts to relieve some of the tension on the thread-limb leading from the take-up to the work, the latter function tending to preclude the possibility of puckering of the seam due to overtensioning of the thread leading thereto.
  • the secondary tensioning effect in a double rotary take-up is created by a new orientation of the component parts thereof, and also involves changes in the direction of rotation of the thread-engaging members.
  • a still further feature of the invention is the provision of an effective thread-breaking means whereby abnormal winding fo the needle-thread about the revolving thread-engaging members of the take-up is precluded, and which provides means for retracting the breaking pins from their operative positions for the purpose of gaining access thereto to facilitate removal of entangled thread pieces.
  • Fig. 1 is a longitudinal vertical sectional View of a single needle, lock-stitch sewing machine incorporating the new take-up.
  • Fig. 2 is a head-end elevation of the sewing machine showing the orientation and direction of rotation of the take-up disks, and includes the anti-winding device shown in its operative position.
  • Fig. 3 is a also a head-end elevation of the sewing machine showing a portion of the coverplate of the take-up broken away to reveal the thread-engaging pins thereof acting upon the needle thread.
  • the thread-engaging pins are shown in two different positions in the stitchforming cycle; the dotted lines ShOWing the pins substantially at the point at which the needle is penetrating the Work and the full lines showing the pins at the stitch-setting point.
  • Fig. 4 is a cross-sectional view of the bracketarm of the sewing machine taken along the line 4-4 of Fig. l and shows the driving mechanism for the rotary take-up shafts.
  • Fig. 5 is a sectional view taken along the line 55 of Fig. 2 and shows in full lines the antiwinding device in its operative position, and in dotted lines the anti-winding device in its retracted or inoperative position.
  • Fig. 6 is a sectional View taken along the line 6-6 of Fig. 2 and again shows the anti-winding device both in its operative and inoperative positions.
  • Fig. '7 is a head-end elevational view of the sewing machine showing a modified form of the thread-breaking device.
  • Fig. 8 is a view of the modified form of the thread-breaking device shown in Fig. '7 taken substantially along the line 88 thereof.
  • the sewing machine embodying the invention comprises a conventional frame including a bedportion l upon which is seated an upright standard 2 which in turn carries a horizontal hollow bracketarm 3.
  • an arm-shaft 4 Rotatably journaled in the bracket-arm 3 is an arm-shaft 4 which is actuated by a belt-driven balance wheel 5.
  • the arm shaft 4 reciprocates a needle-bar 6 by means of a crank I and connecting link 8.
  • An eye-pointed needle 9 is secured to the lower end of the needlebar 6.
  • Mounted adjacent the needle-barfor longitudinal movement is a presser-bar' l having a presser-foot ll afiixed to its lower end,
  • the arm-shaft 4 also drivesa vertically disposed rotary shaft l2 through a pair of bevel gears 13.
  • Ihe vertical shaft l2 in turn drives a rotary hook-shaft l4 horizontally disposed within the bed portion l of the sewing machine, the driving connection between the two shafts comprising a pair of bevel gears l5.
  • a rotary hook I6 is secured to the end of the hook-shaft l4 and is driven in a 2:1 speed ratio relatively to the arm shaft 4.
  • a feed-advance eccentric l1 and a feed-lift eccentric l8 are also carried by the arm-shaft 4.
  • Surrounding the respective eccentrics are vertically disposed pitman links [9 and 2B which oscillate rock-shafts 2
  • Rock-arms 23 and 24 (Fig. 2) are secured to the rock-shafts 2i and 22, respectively, and impart the usual four-motion feeding movements to a feed-bar 25 to which is affixed a feed-dog 26.
  • the take-up mechanism includes a pair of parallel, rotary shafts 21 and 28 journaled in the head-end of the arm 3, both being driven by an arm-shaft gear 29 through gears 30 and 3!, respectively (Fig. 4).
  • a disk 32 is aflixed to the end of the shaft 21 which is driven in a 2:1 speed ratio relatively to the arm-shaft.
  • a disk 33 is secured to the end of the shaft 28 which is driven in a 1:1 speed ratio relatively to the armshaft.
  • the disk 32 carries a single thread-engaging member or pin 34.
  • the disk 33 carries a pair of circumferentially spaced thread-engaging pins and 36.
  • An apertured cover-plate 39 affixed to the frame of the sewing machine overlies the take-up disks.
  • the take-up is threaded by passing the thread T from the supply through stationary thread guides 3'! and 38, into the tension device 40, over a check spring 52 adapted to yield in a counterclockwise direction about the tension device, under a stationary guide or pin 43, and over the thread-engaging pins of the take-up, starting with the pin 34 of the forward disk 32, and then leading rearwardly over the pins 35 and 36 of the rear disk 33. From the rear disk the direction of the lead of thread is reversed, returning forwardly toward the operator, as well as downwardly to be engaged by a thread-guide 44 disposed beneath the forward take-up disk 32. After rounding the guide 44, the thread passes downwardly through a guide 45 to the eye of the needle 9.
  • the thread-engaging pins of the take-up are shown in two different positions in the stitch forming cycle. As shown in full lines, the pins are disposed approximately in their stitch setting positions. In this vicinity it is incumbent upon the take-up device both to set the stitch in the work and to pull a small quantity of thread from the supply through the tension device, this quantity being equal to that used up in forming one stitch.
  • the tension device is required to exert a frictional drag upon the thread sufficiently strong to constrain free movement of thread from the supply, which free movement would prevent the take-up from properly setting the stitch in the work.
  • a strong check-spring is desirable in high-speed sewing machines for the reason that its ability to recover rapidly from its stressed or displaced position to be ready to perform its next operation is directly dependent upon its spring strength.
  • a sewing machine operating at high speeds utilizes a strong check-spring and hence a heavy tension.
  • the orientation and direction of rotation of the rotary elements of the take-up have been so arranged that relative motion is established between the thread and the thread-engaging pins at the'time of stitch-setting.
  • the direction of this relative motion is such that a frictional. drag is put upon the thread opposing that of the tension device.
  • the direction of rotation of the take-up disks is counterclockwise, and is such that the movement of the thread-engaging pins is in the direction of the flow of thread from the tension device to the needle for the major part of the stitchforming cycle.
  • the frictional drag of the thread-engaging pins upon the thread acts to relieve a portion of the tension upon the thread-limb leading to the seam.
  • the full load of the tension device is not carried to the seam, but a portion of the force is dissipated in the take-up, which force is utilized to assist the take-up in pulling required thread from the supply through the tension device.
  • This slack thread if permitted to find its way to the tip of the needle could result in fouling of the thread just prior to penetration. The consequence is thread breakage.
  • This thread-guiding element as has been interposed between the take-up and the needle.
  • This thread-guide is laterally spaced from the thread-engaging pins of the disk 33 at the time that the needle is approaching the penetration point, so that the thread-limb between the pins of the disk 33 and the guide 44 is disposed substantially horizontally.
  • a thread-breaking mechanism 41 to preclude unnatural winding of the needle-thread about the revolving pins of the take-up, is mounted on the head of the sewing machine between the two disks 32 and 33.
  • the device comprises a carrier 43 which is hinged at its lower edge to the frame of the sewing machine.
  • the carrier 48 is formed with arms overhanging each of the take-up disks and extending inside the orbit of travel of the respective thread-engaging pins.
  • Circular channels are and 50 are provided in the respective faces of the take-up disks 32 and 33, and threadbreaking pins 5
  • the interposed thread-breaking pin When thread leading from the supply becomes ensnared or snubbed upon a revolving pin, which condition would ordinarily result in the rapid winding of a mass of thread upon the pin, the interposed thread-breaking pin will intercept the thread and cause it either to be broken or dragged free of the pin, thereby preventing winding.
  • the carrier 48 is provided with a hinge 53 at its lower edge by means of which the thread-breaking pins maybe retracted from their operative positions for the purpose of gaining access thereto.
  • a coil spring 54 in the hinge urges the carrier into its retracted or open position, and a latch 55 holds the carrier in its operative position against the action of the spring 5%.
  • To release the carrier it is only necessary to lift the latch 55, at which time the spring 53 will act to swing the carrier downwardly to a horizontal position as shown in dotted lines in Figs. 6 and 7.
  • Figs. '7 and 8 show a modified form of the thread-breaking device in which the cover-plate as is provided with a hinge connection 56 between it and the sewing machine frame.
  • a latch 5'? holds the cover-plate in its operative position.
  • the axis of the hinge is inclined to the axis of reciprocation of the needle-bar 9 and is also inclined to the horizontal plane of the bed portion i. This enables the cover-plate to fall into an open position when the latch '51 is released.
  • a coil-spring 58 urges the hinged coverplate outwardly against the action of the latch so that when the latter is released the coverplate is given an initial push outwardly, after which the inclination of its hinge causes it to continue opening into its full-open position as shown in dotted lines in Fig. 7.
  • and 52 are'mounted in a carrier 59 which is in turn rigidly secured to the hinged cover-plate 39.
  • the carrier 59 (Fig. 8) is provided with two pairs of parallel, laterally extending ears E36 and El which are apertured to slidably accommodate the thread-breaking elements 5
  • the breaking elements are independently mounted, and may, therefore, be independently withdrawn from their operative positions. Gripping heads 62 and 63 are respectively provided on the thread-breaking elements 5
  • a pair of revoluble needle-thread takeup members having different radii of revolution about fixed spaced parallel axes, said take-up members acting upon the needle-thread between the said tension device and needle and with the take-up member having the smaller radius of revolution being disposed to engage the needlethread first along the line of flow of thread from the tension device to the needle, said take-up members being arranged with respect to said tension device to engage successive portions of the needle-thread in the direction of lead of thread from the tension device to the needle at the time of their approach to stitch-setting positions thereby to establish a frictional drag upon the thread countering that of the tension device and supplementing the action of the take-up in pulling a suppl of thread through the tension device, and driving connections with said rotary needlereciprocating shaft for
  • said second thread-engaging member being arranged to engage the needlethread in the direction of lead of thread from the tension to the needle at the time of the approach 75 of the thread-engaging members to the point at which the needle penetrates the work, actuating mechanism for rotating said take-up members, and a stationary thread guide disposed between the take-up and the needle, said guide being spaced horizontally from the said second threadengaging member to provide a substantially horizontal slack-consuming thread-limb therebetween at the point in the stitch-forming cycle at which the descending needle enters the work.
  • a rotary needlethread take-up interposed between the tension device and the needle along the lead of thread therebetween, said take-up including a first revoluble thread-engaging member having a fixed axis of revolution, a second revoluble threadengaging member having a fixed axis of revolution horizontally spaced along the line of workfeeding from the axis of reciprocation of said needle, the horizontal distance of the center of revolution of the second thread-engaging member from the axis of reciprocation of the needle being such that substantially all of the orbit of revolution of said second rotary thread-engaging member lies to one side thereof, said second thread-engaging member being arranged to engage the needle-thread in the direction of lead of thread from the tension device to the needle
  • an anti-winding device for preventing winding of the needle-thread upon said revoluble thread-engaging member, comprising, a thread-breaking element operative to break the thread between the thread-supply and the threadengaging member when abnormal winding of the thread occurs about the latter, a mounting for positioning said thread-breaking element within the orbit of movement of said thread-engaging member, and means providing manually selectable operative and inoperative positions for said thread-breaking element, and yielding means for maintaining the breaking-element in its operative position.
  • an anti-winding device comprising, a thread-breaking element operative to prevent abnormal winding of the needle-thread upon the revolving thread-engaging member, a carrier for positioning said thread-breaking element within the orbit of movement of said thread-engaging member, means associated with said carrier and breaking element for selectively positioning the latter in either an operative or inoperative position, and releasable means for holding said breaking element in its operative position.
  • an anti-winding device for preventing winding of the needle-thread upon the said revolving thread-engaging member, comprising, a thread-breaking element operative to break the thread-limb leading from the supply when abnormal thread-winding occurs about the thread-engaging member, a carrier for said thread-breaking element within the orbit of movement of said thread-breaking member, a hinge connection between said carrier and the sewing machine providing for selective operative and inoperative positions of said thread-breaking element, and releasable means for maintaining said thread-breaking pin in its operative position.
  • a sewing machine having a rotary take-up comprising a pair of rotar elements having spaced axes of rotation and at least one orbitally movable thread-engaging member carried by each of said rotary elements, a thread-breaking element associated with each rotary element and operative to prevent abnormal Winding of the thread upon the thread-engaging members, a carrier for said thread-breaking elements for positioning the latter within the respective orbits of said thread-engaging members, connecting means between the sewing machine and the carrier for providing selective operative and inoperative positions for said thread-breaking elements and releasable means for holding said thread-breaking elements in their operative positions.
  • a sewing machine having a reciprocatory needle-bar and a rotary needle-thread take-up mechanism including an orbitally movable threadengaging member, an anti-winding device for preventing abnormal winding of the thread upon the thread-engaging member of the take-up, said device comprising a thread-breaking element operative to break the thread when abnormal winding occurs, a carrier for said thread-breaking element for positioning the latter adjacent the path of the thread-engaging member, and a hinge connection between said carrier and the sewing machine providing for selective operative and inoperative positions of said thread-breaking element, the axis of the hinge forming an acute angle with the line of reciprocation of the said needlebar.
  • a sewing machine having a substantially horizontal bed-portion and a rotary needlethread take-up mechanism including an orbitally movable thread-engaging member, an antiwinding device for preventing abnormal winding of the thread upon the thread-engaging member of the take-up, said device comprising a threadbreaking element operative to break the thread when abnormal winding occurs, a carrier for said thread-breaking element for positioning the element adjacent the path of the thread-engaging member, and a hinge connection between said carrier and the sewing machine providing manually selectable operative and inoperative positions of said thread-breaking element, the axis of the hinge being inclined to the bed portion of the sewing machine.
  • a rotary takeup mechanism including an orbitally movable thread-engaging member, an anti-winding device for preventing abnormal winding of the thread upon the thread-engaging member, said device comprising a thread-breaking element operative to break the thread when abnormal winding occurs, and a carrier for positioning said thread-breaking element in the vicinity of the orbit of the thread-engaging member, said thread-breaking element being slidably mounted in the carrier to permit the former to be selectively displaced axially between its operative and inoperative positions.
  • a sewing machine having a rotary takeup mechanism including an orbitally movable thread-engaging member, an anti-winding device for preventing abnormal winding of the thread upon the thread-engaging member, said device comprising a thread-breaking element operative to break the thread when abnormal Winding occurs, and a carrier for positioning said threadbreaking element in the vicinit of the orbit of the thread-engaging member, said thread-breaking element being slidably mounted in the carrier to permit the former to be selectively displaced axially between its operative to an inoperative position, and a hinge connection between said carrier and the sewing machine to permit the carrier and thread-breaking element to be swung outwardly as a unit from the take-up.
  • an anti-winding device for preventing abnormal winding of the needle-thread upon the threadengaging members, said device comprisin a thread-breaking element associated with each of said disks and operative to break the needlethread when abnormal winding occurs, a common carrier slidably accommodating each of said thread-breaking elements to enable the latter to be independently shifted from their operative to inoperative positions, and a hinge connection between the carrier and the sewing machine to permit the carrier and thread-breaking elements to be swung outwardl as a-unit away from the take-up mechanism.
  • a pair of revoluble needle-thread take-up members having different radii of revolution about fixed horizontally spaced parallel axes, said take-up members acting upon the needle-thread between the said tension device and said needle with the take-up member having the smaller radius of revolution being disposed to engage the needle-thread first along the line of flow of .thread from the tension device to the needle, said take-up members being arranged with respect to said tension device to engage successive portions of the needle-thread in the direction of lead of thread from the tension device to the needle, the horizontal distanc from the center of revolution of the take-up member having the larger radius of revolution to the axis of reciprocation of the needle being such that substantially all of the orbit of revolution of such member lies to one side of the such axis, and a stationary

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US41472A 1948-07-30 1948-07-30 Rotary take-up for sewing machines Expired - Lifetime US2554144A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US41472A US2554144A (en) 1948-07-30 1948-07-30 Rotary take-up for sewing machines
GB346/49A GB656419A (en) 1948-07-30 1949-01-05 Rotary take-up for sewing machines
GB347/49A GB656420A (en) 1948-07-30 1949-01-05 Rotary take-up for sewing machines
FR979751D FR979751A (fr) 1948-07-30 1949-01-28 Mécanisme de relèvement rotatif pour machines à coudre et machines à coudre munies de ce mécanisme
AT175138D AT175138B (de) 1948-07-30 1949-02-04 Nähmaschine mit umlaufendem Aufnehmer
AT176094D AT176094B (de) 1948-07-30 1949-02-04 Nähmaschine
CH281716D CH281716A (de) 1948-07-30 1949-02-04 Nähmaschine mit einer zwei Fadengeberscheiben aufweisenden Nadelfadengebereinrichtung.
CH285450D CH285450A (de) 1948-07-30 1949-02-18 Nähmaschine mit einer Nadelfadengebereinrichtung, die mindestens einen umlaufenden, am Nadelfaden angreifenden Teil aufweist.
DEP35271D DE895402C (de) 1948-07-30 1949-02-27 Naehmaschine
DEP35553D DE820533C (de) 1948-07-30 1949-03-02 Naehmaschine mit einem umlaufenden Fadengeber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41472A US2554144A (en) 1948-07-30 1948-07-30 Rotary take-up for sewing machines

Publications (1)

Publication Number Publication Date
US2554144A true US2554144A (en) 1951-05-22

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ID=21916692

Family Applications (1)

Application Number Title Priority Date Filing Date
US41472A Expired - Lifetime US2554144A (en) 1948-07-30 1948-07-30 Rotary take-up for sewing machines

Country Status (6)

Country Link
US (1) US2554144A (de)
AT (2) AT176094B (de)
CH (2) CH281716A (de)
DE (2) DE895402C (de)
FR (1) FR979751A (de)
GB (2) GB656419A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2191736A (en) * 1937-10-12 1940-02-27 Singer Mfg Co Take-up for sewing machines
US2321550A (en) * 1940-11-05 1943-06-08 Singer Mfg Co Rotary take-up for sewing machines
US2385960A (en) * 1944-04-11 1945-10-02 Singer Mfg Co Rotary take-up mechanism for sewing machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2191736A (en) * 1937-10-12 1940-02-27 Singer Mfg Co Take-up for sewing machines
US2321550A (en) * 1940-11-05 1943-06-08 Singer Mfg Co Rotary take-up for sewing machines
US2385960A (en) * 1944-04-11 1945-10-02 Singer Mfg Co Rotary take-up mechanism for sewing machines

Also Published As

Publication number Publication date
CH285450A (de) 1952-09-15
DE820533C (de) 1951-11-12
DE895402C (de) 1953-11-12
CH281716A (de) 1952-03-31
FR979751A (fr) 1951-05-02
AT176094B (de) 1953-09-10
AT175138B (de) 1953-06-10
GB656419A (en) 1951-08-22
GB656420A (en) 1951-08-22

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