USRE7762E - Improvement in sewing-machines - Google Patents

Improvement in sewing-machines Download PDF

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Publication number
USRE7762E
USRE7762E US RE7762 E USRE7762 E US RE7762E
Authority
US
United States
Prior art keywords
needle
bar
shaft
take
pin
Prior art date
Application number
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English (en)
Inventor
Eobeet Whitehill
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  • the invention consists in a combination, with an oscillating needle-thread controller or take-up, of a stationary bar or pin, made to occupy au eccentric position relatively with the arbor or axis of vibrationof the take-up, and so that the needle-thread is deected over said bar by the take-up as the latter completcs its stroke in concert with lthe upward stroke of the needle.
  • An oscillating take-up thus made to operate in connection with an eccentrically-disposed bar or pin provid'es alike for delivery of the thread at a proper time and in suitable amount, without forming unnecessary slack, and for a tightening action on the needle-threadwhen the stitch is formed.
  • the invention also consists in an oscillating take-up, made adjustable around the arbor by which it is operated, whereby provision is made for adjusting the Atake-up to suit different thicknesses of fabric.
  • the invention further relates to certain improvements in that kind of needle-motion in which the needle is driven by sun and planet gearing; and this part ofthe invention consists incertain novel constructions and combinations of the parts of such a needle-motion, whereby a more direct application of the driving-power is provided for, and the needle is made to work with the same velocity in its upward stroke asin its downward stroke, and Y the machine is enabled to be driven at a very high speed.
  • the invention likewise consists in a combination of mechanism in a sewing-machine having its needle-bar or carrier actuated by sun and planet gears arranged at the for. ward end or in front of the actuating-shaft, whereby said actuating shaft and the shuttle driving-shaft, which are geared together by level rs, are in like vertical planes, and the crank on the shnttledying shaft, works paruttle-driver, which is actuated vby a4 allel with the actuating-shaft, thus enabling the machine to be run at a high velocity with ⁇ perfect steadiness and accuracy.
  • Figure 1 represents a partly-sectional head or forwardend view of a shuttle sewingmachiue in part7 having my improvements applied.
  • Fig. 2 is a vertical section, at right angles to Fig. 1, of the saine.
  • Fig. 3 is a front or face view of the head of the machine with the face-plate of said head removed.
  • Fig. 4 is a face view, upon a larger scale, of the take-up, showing the same, by full and dotted lilies, in different working positionsin relation with a stationary :eccentric bar or pin, with which it is combined and operated; and
  • Fig. is a vertical section of said oscillating take-up at right angles to Fig. 4, and on a corresponding scale therewith.
  • Fig. 6 is an inverted plan of the machine; and
  • Fig. 7 is a vertical section thereof, mainly ou the irregular line y y.
  • A is the cloth bed or table of the machine.
  • ' l is the sewing-needle, carried by a straigh bar, arranged to work up and down within a groove in the back of the face-plate L on the head or forward end of the stationary arm of the machine.
  • the needle-bar 1 )l is reciprocated by means of a connecting-rod, G, which receivesl its motion from an eccentric pin, h, on or connected with a planet-wheel carried by a hollow hub, Cl, on the front end of the actuating-shaft C, and gearing with a stationary circular r'ack or sun-wheel, ⁇ which is concentric with said shaft.
  • H represents the fixed sun-wheel
  • I the planet-wheel gearing therewith.
  • Said eccentric or wrist pin h is attached to a of the planet-wheel I, and the arrangement of the connection of the needle-bar in advance of the forward end of the actuating shaft C admits of the whole length of the pin a, by which the connecting-rod G is attached to theneedle-bar, and the whole length ofthe wrist-pin h, being brought between the same planes, perpendicular to the axes of the said pins, and therefore produces a very nearly direct action of the said crank-pin and its con-
  • the planetwheel I and its shaft f are carried in and by the 'hub or projection C1, which is fast on the forward end of the actuating-shaft C, and is constructed of a sleeve form, running in a backward direction over the sun-wheel H, whereby an extended planet-wheel shaft, j', may be used, and bearings be formed in said hub or projection for the said shaft on opposite
  • the sunwheel H is actuating-shaft C inside of the hub or projection Ol.
  • the head B1 of the stationary arm B forms ahollow case or box, whichi protects the sun and planet gears and other parts from injury, and which furthermore catches any oil or lubricating material thrown o' from said contained devices.
  • the curvilinearly reciprocating oroscillating takeup K is operated by the needle-bar Dl in a positive manner, directly from the latter, by means of a rack, c, on said bar, arrangedto gear with a pinion, g, on the arbor N of the take-up, which latter is disposed in front of the face-plate L, within which the needle-bar works.
  • the take-up has its axisof vibration on one side ⁇ of the needle-bar.
  • Said takeup K has combined with it a stationary pin or bar, M, arranged eceentrically in relation with the center of the oseillatin g takeup.
  • the needle'threadm is represented as passing through an eye, i, downto and round a tension device, k, below the takeup, and from thence to and on one side of the stationary bar, wire, or pin M.
  • the needle-thread is then continued to and through the eye l of the take-up at any suitable distance from the axis of the latter, and from thence t0 the needle D,- passing through a guide, n, on the needle-bar.
  • the eye l of the takeup is constructed and arranged so that the thread m passes through itin a direction parallel with the axis of vibrat-ion ofthe take-up, whereby the loop 0r bend of the thread produced by the passage of it through said eye has its two sides or lilies separated a distance equal to the length of the eye. This prevents the two lines of the thread crossing each other in contact and producing friction and wear on each other, as well as irregular sewing.
  • the takeup K By the take-up K having its carrying stud or arbor N arranged to project at right angles kfrom the face of the head or forward end of the stationary arm of the machine, the takeup K is caused to oscllate in front ofthe face plate L, and in a plane parallel therewith, anc the needle-bar and the gear g, operated by said bar or its rack c, lie 'with their faces be tween the face-plate L and the head of the machine. This brings the eye lof the takeup, when in its extreme uppermost position, nearly directly over the needle, so that the thread m draws nearly on a straight line between the eye of the needle and the eyeof the take-u p.
  • This arrangement of the takeup also, relatively to the faceplate L, causes the slack of the thread, when delivered by the takeup, to be cast toward the rear side ofthe machinethat is, the side opposite to that which is occupied by the operator when working the machine. There consequently is no danger of the slack thread interferin g with the operator handling the work to be sewed.
  • both lines of the needle-thread m are on the back or inside surface of the bar or pin M when the stitch is being tightened.
  • This stationary bar or pin M which forms a threadguide, is suitably bent to provide vfor its attachment to the edge of the face-plate L.
  • the eye lof the oscillating takeup K travels backwardly over and down and below the pin or portion of the bar M which occupies an eccentric rela-tion with the take-up, and over which the needle-thread is bent or deected in or by the back action of the takeup.
  • the two extreme positions of the takeup are represented by full and dotted lines in Fig. 1 and by dotted lines in ⁇ Fig. 4.
  • the eye l of the -takeup occupies the lowest position represented for it by dotted lines in Figs. 1 and 4, in assuming which position-that is, in traveling from its upper dotted position to itsvlowermost one-it has provided for the free delivery of the thre'ad in suitable amount without forming unnecessary slack' for the needle in its downstroke to carry through the cloth.
  • the takeup K in starting from its lowermost dotted position, at first takes up slowly the slack of the needle-thread, thereby allowing the needle to form the loop, also giving Aample time for the passage of the shuttle through the loop, and, as the needle continues its ascent, said take-np afterward moves more rapidly, andl continues to take up the slack till the needle is out of the clothand the stitch is tightened, the takeup K lthen assuming its highest position, with its eye l directly over the center of the take-up, as represented by full lines in Fig. 4.
  • the take-up K is made adjustable on or around its arbor N, to set its eye I. more or less backward lor forward relatively to the stationary bar or pin M, whereby provision is made for adapting the take-up to deliver the slack thread sooner or later, to suit diii'erent Y thicknessesof cloth.
  • Aclamping-nut, s serves to secure the take-up inV the position to which it has been adjusted around its arbor.
  • the actuating-shaft C in front of which the needle-bar D is worked by sun and planet gears, as described, has mounted on it, near its back end, a bevel-wheel, b', which gears with a bevel-wheel, c, on an upright slaft, B, which is in the same vertical plane with the actuating-shaft C.
  • This upright shaft B carries at its lower end a crank, C, w ich serves to operate the shuttle-driver D, th t is arranged to work within the race E2 parallel with the actuating-shaft C.
  • the means for communicating motion from the crank O to the shuttie-driver D consist of a connecting-rod, d?, operated by the crank C', and connected iear the shuttle end of the machine with a curvilinearly-reciprocating slide, f 2, which has its center of motion at e?, and is supported at its outer end in a curved guide, g.
  • This slide f operates a slotted lever, h2, having its fulcrum at a?, and connected at its free end, by a connecting link', k, with the shuttle-driver D2 I claim- 1.
  • the stationary b ar or pin M arranged to occupy an eccentricv position relatively with the arbor N or axis of oscillation of the takeup, substantially as specied.

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