US600423A - Sewing machine - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1.

C. B. HUNT. SEWING MACHINE.

No. 600,423. Patented Mar. 8, 1898.

(No Model.) 3 Sheets-Sheet 2.

C. B. HUNT.

SEWING MACHINE. No, 600,423. Patented Mar. 8, 1898.

3 Sheets-Sheet E.V

(No Model.)

G. B. HUNT. SEWING MACHINE.

No. 600,423. .Patented Mar. 8, 1898.

Fia/4.

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PATENT CHARLES BRANSTON HUNT, OE LONDON, ENGLAND, ASSIGNOR'TO THE NEW BRANSTON TYVO REEL SEIVING MACHINE COMPANY, LIMITED, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 600,423, dated March 8, 1898. Application filed AprillO, 1895. S erial No. 545,`216. (No model.) Patented in England March 28,1895,No. 6,415.

To @ZZ whom, it may concern,.-4

Be it known that I, CHARLES BRANsToN HUNT, a subject of the Queen of Great Britain, and a resident of 59 Ilolborn Viaduct, London, England, have invented certain new and useful Improvements in Sewing-Machines, (patented in Great Britain, No. 6,415, dated March 28, 1895,) of which the following is a specification.

This invention belongs to that class of sewing-machines having two reels of thread in simultaneous operation, one thread being above and one below the work-plate.

The invention relates to a suspended plate with grooves in rim, a hollow depending leg with interior spring, and projecting lip for holding under reel in position, said plate having edge grooves to receive a pair of slotted swing disks or levers with gates and supported on brackets and actuated by or from a rod, said levers being the means by which the lower reel and its adjacent parts are held suspended.

The several detail appliances are shown in the annexed drawings separately and in the positions they respectively occupy in a machine.

Figure 1 is an elevation of the looper; Fig. 2, an end view of same; Fig. 3, a perspective plan of the suspended plate and hollow leg, the cover of the plate being removed to show the grooves in which gate disks or levers move and by which said plate is suspended; Fig. a, a perspective plan elevation of the lower reel-carrier; Figs. 5 and 6, plans of the gatelevers supported by brackets and operable by rods; Fig. 7, an end view of the cam with the rods and cross-head, the suspended plate and hollow leg being also shown, partly in section, for exposing the reel-supporting spring and lip; Fig. 8, a sectional plan of the crosshead with the ball-joint, cam, and part of the lower shaft in section; Fig. 9, a part sectional elevation of theV lower reel-carrier with the cover turned up and reel dropped in position. Figs. 10 and 11 are side and front views of lower reel-carrier in position it occupies suspended under the work-plate and indicating the travel of the looper and position of the loop during its opening and spread around the reel-carrier. Fig. l2 is a general elevation of the appliances in their respective positions, looking from the front ofthe machine, the frame and work-plate being in section. Fig. 13 illustrates, in enlarged view, the formation of the stitch. Fig. 14 is a part sectional baek View to more clearly show the connection between the under shaft and rod to which motion is transferred by the cam for operating the gate-levers, which pass the cotton from the front to the back of the suspended reel-carrier. Fig. 15 is a front view of the looper-crank or lever. Fig. 1G is a perspective view of the looper to clearly show the eccentrically-placed shank, which is secured in the smaller socket of the crank shown in Fig. l5. Fig. 17 is a top plan of the reelcarrier and gatedever mechanism as it would appear with the work-plate completely removed. Fig. 18 is a sectional plan on the line a a, Fig. 14, of the bracket that carries the gate-lever-operating mechanism. Figs. 19, 20, and 2l are diagrammatic views illustrating the method by which the loop is passed from the front to the back of the reel-carrier.

In carrying out this invention the hook or looper 1 is formed with one straight edge and widens out on theotheredgeto form a broad back having a forwardly-overhanging lip 2 with a channel between for the lodgment of the loop when drawn on by the hook. The hook or looper 1 and the lip 2 before mentioned are on the end of a stem 3, gradually tapered on its underside to enable it to work as closely as possible and yet clear the reelcarrier in its rotation. The shank 4*, by which the looper is secured by clipping in the socket 4 of the crank or lever 5, is formed eccentric to the stem 3, by which means the looper can work very close to the under side of the work-plate and yet allow of sufficient thickness for strength at the top of the socket 4E, as is very clearly shown in Fig. 14. The crank or lever 5 is clipped by the screw 5* to the under shaft 6, by which it is nrotated to carry the looper around the reel-carrier point first.

The means for holding the post upon which the reel-carrier is suspended and the manner in which the gates are operated to allow the loop tobe carried around the reel-carrier and the locking-thread will be understood upon referring to Figs. 3, 4, 5, 6, and 7, and 10, 11, and 12 in connection with the following description..

A circular plate 7 has two segmental recesses 8 8, milled or turned in its top face on opposite sides thereof, and also a slot 9 for the reception of a projecting lug 35 of the reel-carrier, which is suspended upon the hollow stem 11, projecting downwardly from the under side of The plate 7 and having within it a spring 12, the end 13 projecting beyond the stem 11, as shown in Fig. 7, to serve as a catch or support upon which the reel-carrier rests when slipped on said stem, the removal being effected by simply pressing the knob 15 to bring the overhanging lip 13 flush with the stem, when the reel-carrier will drop and allow of easy removal.

The plate 7, with its downwardly-projecting stem, is suspended and supported by the gate-levers 20 20, in which slots 22 22, herein termed gates, are formed. The said gatelevers 20 20 are pivoted at 21 2l, in one oase to an adjustable slide 36 and in the other case to a horn 36*, curving inwardly and upwardly from a bracket 421, the distances between said centers 21 21 being so arranged that the gatelevers 2O 20, which are of the same circumferential contour as the segmental recesses 8 8, will exactly fit into said recesses on the plate 7, being held up to them when it is secured in its position by placing the cover-plate 17 over the gate-levers 2O 20 and fixing by the insertion into the screwed hole 16 in the leg 11 of the screw 18, the exact position said coverplate 17 is to occupy being determined by two steady-pins 18d 18*, by which it is insured that the slot 9 of the cover-plate always corresponds with that in the plate 7. Having fixed the plate 18, it Will be seen that it supports the plate 7 and its depending stem 11 by resting on the gate-levers 20 20, and the webs or bottoms 8* 8* of the recessed parts 8 8 in the plate 7 will resist any upward or lifting force that may be brought to bear, such as by the pull in of the thread by the take-up. Moreover 'the said stem 11 and plate 7, with its cover 17, is absolutely locked in any position, so long as the gate-levers 2O 2O are engaging within the segmental recesses, whereby it can neither be turned around upon its center nor be moved laterally in any direction by reason of the engagement of the periphery of the gate-levers with the corresponding inner circumferential shape of the recesses 8 8, so that it follows that the direction of any movement (such as turning on its' center or in a lateral direction that a person may try and force the plate 7 to take) is in a direction across the gate-levers, which must resist such movement unless shorn, cut off, or broken by sheer force, yet at the same time it is evident that the gate-levers can be easily rotated or moved upon their centers 21 21 by reason of the circumference 8 8 of the segmental recesses agreeing with the circumferential movement of said gate-levers, which, although moved, do not alter their relationwith the plate 7, so far as their locking properties are concerned.

The reel-carrier is formed with a base 23 and thickened boss or shoulder 24 for bearing on the lip 13 of the spring 12 when placed upon the stem 1l. Upstandingfrom the base 23 is a tubular post 25 of such internal diameter as to iit-the stem 11 somewhat loosely. The band 26, forming the upper part of the carrier, is connected by the upright bar 27 and a forwardly-projecting prow 28 and arms 29 29 to the base 23. The cover 30 is pivoted to the band 26 at the part 31, so that it may be turned up, as indicated at Fig. 9,1when a reel has to be removed or a fresh one inserted in the carrier. A dat spring 32, secured to the base 23, bears against the edge of the cover 30 to hold itin position whether opened or closed, and in connection with the said spring 32 is another spring 33, which bears against it to put tension lupon the thread as it is being drawn from the reel, which thread is laced through perforations and under the hook 33* in the manner indicated by the dotted lines in Figs. 4 and 16, and is then laid between the two checks 35 35, which also serve to locate the carrier by entering the slot 9 when being placed in position on the stem 11.

The gate-levers 2O 20, as before explained, vare pivoted at 21 21, and in order that they may allow the loop to be drawn over the reelcarrier from the front to the back it is necessary that they should both partake of a semirotary movement in the same direction. Therefore these levers are respectively provided with pins 38 385k, projecting therefrom for engagement in slotted holes 39 39* in their respective arms 40 40*, which are secured to a sliding rod 41, supported in bearings 42 42. (See Figs. 5, 6, and 17.)

A reciprocating motion is imparted to the rod 41 by means of a face-cam 52, secured to the end of the under shaft, which is rot-ated in the well-known manner. A rock-lever 49 is formed with a central ball 50, having a hole of such diameter that when the screw 51 is passed through it to confine the ball in the cup-socket at the end of the shaft 6, as shown in Fig. 8, it will allow the rock-lever to oscillate under the action of the cam 52 in the manner which can be easily followed by referring to Figs. 5, 6, and 18, which show it in three positions of, say, outstroke, instroke, and midstroke. This movement is transferred to the gate-levers 2O 2,0 by the connection of the joint 48 to one end of the rod 47, (see Figs. 14 and 18 and Figs. 5 and 6,) but inasmuch as the rod 47 in these latter figures is immediately underneath the rod 41 it is not visible, but can be clearly seen in the cross-section, Figs. 7 and 14. The other end of the rod 47 is connected by the arm 46 and pin 45 to the lever 43, one end of which is pivoted at 44 to the under side of the bracket-plate 37 and the IOO IOS

IIO

other end of said lever 43 is jointed to the rod 41, that carries the arms 40 40i. By connecting the arm 4G to the middle of the lever 43 an increased travel is imparted to the arm 41 in excess of that imparted to the rod 47 by the rock-lever 49, the object being` to use a shallower cam 52 and thus prevent the tendency to hammer when run at a high speed, which would be the case if a deeper cam were used and the lever 49 connected directly to the rod 41 for operating the gate-levers. lnasmuch as the gate-levers are arranged on opposite sides of the plate 17 it becomes necessary in order to turn them in the required direction that the pins 38 3S, which engage the arms 40 40:, should be arranged on different sides of the pivotal center. Therefore the pin 3S is xed in the lever 2O to the front of the center 21 and projects downwardly to engage the slot 39 of the arm 40, which can work uninterruptedly under the bracket-plate 30, the distance from thc center 21 at which the pin 3S is xed being such as will give the required rotative movement of the lever 2O from the limited movement of the rod 41.

The pin 38* is arranged at the same distance from its center 21, but at the back thereof,and stands up from the lever 2O to engage the arm 40* above it.

The relative positions of the levergates and the manner of passing the loop will be clearly understood upon referring' to the diagrams Figs. 19, 20, and 21, in which the gatelevers occupy the positions shown in plan at Figs. 5, 17, andt, respectively.

In Figs. 5 and 12, the gates 22 present their openings to the front to receive the loop as brought down by the looper to approximately the position shown, in which by passing over the prow 2S it is widened out, and as the looper is passing under the carrier it enters the gates 22 22, which now begin to turn back at about the same rate as the travel of the looper, so that when said looper is approximately midway under the carrier the gates are in midposition, as indicated in Figs. 17 and 20, the gates 22 22 being of such alength that a sufficient space remains outside the plate 17 for the threads of the loop to be confined within them. W'hen, however, the gates have moved to the position indicated in Figs. 6 and 21, the gates are open to the back of the reel-carrier, and it is evident there is nothing to prevent the take-up pulling it completely upto the work and inclosing the locking-thread shown in dotted lines b in the diagrams. ton-reel is not shown in the carrier in the diagrams for the sake of clearness, but can, however, be clearly seen in Figs. 10 and 11, in which the travel of the hook or looper and manner in which the loop is twisted and widened out can be traced, the positions and various phases of the looper in each figure being designated by the letters c d c Thus at c the hook has just entered the loop, the top thread of which lies under the overhanging lip and the lower thread of the loop lies The cotto the left of the top thread; but in position d it will be noticed that the lower thread of the loop by reason of the bow of the loop sliding up the inclined edge of the hook under the pull exerted has changed from the left to the right hand position, thus effecting the twist before spoken of, and the bowof the loop lies in the channel formed by the overhanging lip and by which the further pull upon the loop is now effected. In position c the loop is being drawn over and widened out by the prow 28 of the reel-carrier, and in position f the loop has been carried just beyond the vertical center or largest diameter of the reel-carrier at the bottom b v the hook and at the top by the gates 22 22 in the manner before explained. It is to be noticed that in position f the looper is upside down, with the point curving upwardly, which imparts a tendency to the loop to leave it, as shown in Fig. 10, and is then pulled by the take-up, which causes it to slide back along the graduallylessening diameter at the bottom of the reelcarrier in a manner that can be well understood, thus causing it to recede farther from the hook and thence be drawn up into the work. The return movement of the gate-levers then takes place for the gates 22 22 to be in position to receive the neXt loop.

The procedure in preparing the machine for sewing is as follows: The reel-carrier is opened, as at Fig. 9, and a reel 19 is dropped over the post 25 and the lid 30 closed down. The free end of the thread is now drawn over the upright 27* and passed downwardly between springs 32 33 to engage under the horn 33*l It is then drawn upwardly to enter the slotted eye 32=1 and over the lid 30 and laid between the cheeks 35. reel, is then slipped up the leg 11, the cheeks 35 engaging in the slot 9 of plate 7 to properly locate it, the spring-lip 13 taking under the shoulder 24 of the carrier and holding it thereon. Between the cover 30 and under side of the plate a sufficient space is left for the free passage of the thread. Two studs projecting from said plate 7 effect this. The needle next descends and the looper 1 carries the loop of the top thread around the carrier and picks up the free end of the bottom thread, which the needle-thread in its npstroke lifts above the work-plate.

It will be'understood that at each stitch be- The carrier, with its Ioo IIS

ing formed the looper in taking the loop is drawn down and around the carrier for interlocking the bottom thread C, and when said looper has drawn the loop clear of the widest lower part of the carrier the take-up suddenly comes into action and pulls the loop away from the looper, the distance the takeup travels being sufficient to pull up the whole of the slack and make the stitch, the loop of the upper thread retaining the half-twist, said half-twist being on the upper side of the stitched fabric with the uprising portion of the thread lying alongside that portion formed by the descending part of the same loop, both portions, however, being in the same hole. The stitches thus made lie slightly anglewise to each other, but to the thickness of the thread only, each loop constituting a halftwist'on itself and a bight on the lower or locking thread.

lWhat I claim, and desire to secure by Letters Patent, is-

1. In a sewing-machine, the combination with the hook or looper, and the lower reelcarrier, of a recessed horizontally-arranged plate having a depending stem from which the said reel-carrier is suspended, a pair of pivotally-supported gate-levers to engage the recesses of the reel-suspending plate and provided with gates 22 for passage of the loops around the reel-carrier, and mechanism for imparting a semirotative movement to the gate-lever in the direction that the loop is to be carried, substantially as described.

. 2. The combination with the hook or looper, and the lower reel-carrier, of a recessed horizontally-arranged plate having a tubular depending stem, a spring inclosed in said stem and provided with a projecting lip to support said lower reel-carrier, apair of pivotal gatelevers to engage the recesses of the reel-suspending plate and support the same, said gate-levers being provided with gates for passage of the loops around the reel-carrier, and mechanism for imparting a semirotative movement to the gate-lever in the direction that the loop is to be carried, substantially as described.

3. The combination of the hook or looper having a forwardly-disposed overhanging lip, the lower reel-carrier, a recessed plate having a depending stem on which the lower reelcarrier is supported, a pair of pivotally-supported gate-levers .to engage the recesses of said plate and provided with gates for passage of the loops around the reel-carrier, and mechanism for imparting a semirotative movement to the gate-levers in the direction that a loop is to be carried, substantially as described.

In witness whereof I have hereunto set my hand, in presence of two witnesses, this 29th -day of March, 1895.

CHARLES BRANSTON HUNT. Witnesses:

- RICHARD CORE GARDNER,

ALEX. RIDGWAY.

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