US543507A - richards - Google Patents

Description

n0 Model.) a Sheath-Sheet 1.

D; RICHARDS. SEWING MACHINE.

No. 543,507. Patented July so, 1895.

(No Model.) 7 3 Sheets-Sheet 2.

D. RICHARDS.

SEWING MACHINE. I No. 543,507. Patented July 30, 1895.

D. RICHARDS.

SEWING MACHINE.

Patented July 30, 1895.

(No Model.)

WWJM

- UNITED STATES PATENT OFFIQE.

DAVID RICHARDS, OF LONDON, ENGLAND.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 543,507, dated July 30, 1895.

Application filed April 3. 1893. Renewed February 25, 1895- Serial No. 539,678- 7 (No model.)

To all whom it may concern:

Be it known that 1, DAVID RICHARDS, engineer, a subject of the'Qucen of Great Britain, and a resident of London, in the county of London, England, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a full and true specification.

My invention relates to improvements in sewing-machines, and has for its object to afford a greater supply of thread to the spool or bobbin of the lock-stitch mechanism than can-be wound upon the ordinary bobbin; and in accordance therewith 'means are provided whereby a second reel of cotton or thread is made use of for the supply of the underneath thread or cotton, and which second reel itselfperforms the functions of a shuttle, in so far as it carries the under or looking thread through the loop formed in theupper thread, or alternatively a bobbin, as hereinafter described, may be employed capable of holding a sufficiency of thread, the advantages to be derived from such a system being that the machine may run a much longer time without stopping for the purpose of replacing the empty spool or bobbin with a full one or of winding fresh cotton or thread upon the bobbin than has heretofore been possible with the ordinary shuttles of lock-stitch machines, upon the bobbins of which only a very few yards can be wound; and, again, by this intion a very high speed may be obtained without fear of breaking the top thread, as friction thereupon is reduced to a minimum.

Now, in accordance with this invention I have a novel and simple arrangement of bobbin and lock-stitch mechanism, whereby the advantages above enumerated are obtained, and whereby additional advantagessueh as economy, less liability of accident, as well as a capability of working at a greatly-increased speedare secured than are possible with that class of machines now known as tworeel sewing-machines.

In order that this my invention may be fully understood and readily carried into effect, I will now proceed to describe the same with particular reference to the accompanying drawings, in which similar letters of reference indicate like parts in all the figures.

Figure 1 shows in side elevation my improvements as applied to a sewing-machine. Fig. 2 is a front sectional elevation of the same through line A B, Fig. 1. Fig. 3 is an inverted plan. Fig. 4 is a detailed view showing the sliding plate removed and the front pin turned up for the removal of the reel. Fig. 5 is a detail view of the sliding sleeve or bush which carries the thread-reel; and Fig. 6 is an inverted plan-view of my improvements, portion of the cylinder being broken away.

In carrying out this invention I have, beneath the bed-plate of the machine, a revolving cylinder a, formed at its front or needleend with a suitably-shaped hook or looper a. This cylinder a is carried upon the shaft a:

' and revolves with same.

Centrally (andlongitudinally therewith) inside the cylinder (1 aforesaid I have a projecting pin or rod 1?. This pin or rod 19 extends from the back of the cylinder and terminates at or slightly within the front end of the cylinder. Supported in a suitable bearing d, formed at the front end of and underneath the bed-plate e of the machine, I have a second pin or rodf, which isin line with the pin or rod b and extends nearly thereto, a small space being left between the two ends .to allow of the passage of the thread or loop after the lock-stitch is formed. These two pins or rods 17 f form the spool-race. Sliding upon the aforesaid pins b f or spool-race I have a sleeve or bush g, (shown separately in Fig. 5, and also seen in Figs. 1, 3, 4, and 6,) which carries a reel of cotton or thread h. This bush or reel-carriage g I form at one of its ends with a suitably-shaped head i, in the groove or against the shoulder of which takes the projecting finger k of its actuating arm or lever Z- worked by cam or cams or other suitable mechanism or gearing and from which the cotton-reel it receives a reciprocating motion upon the spoolrace I) f. Though not shown, suitable leaders and tensions may be applied for the under thread if desired. The actuating-arm Z maybe given an oscillating motion as well as a reciprocating motion in order that the projecting finger is may be kept well within the groove 1' on head of the reelcarriage, and backlash and consequent rattling thereby be prevented.

In Fig. 6, which is an inverted plan of my im provements as applied to a sewing-machine, will be plainly seen the action of the reel-carriage g upon the guide-pins or spool-race hf. A portion of the cylinder a is in this figure shown broken away for facility of illustration. The actuating-arm Z is jointed at Z to the lever s, which is pivoted at s to the underside of the bed-plate c. On the levers there is a projecting stud or roller Z (shown in dotted lines,) which travels in a cam-groove formed upon the periphery of the drum 11/, fixed upon and revolving with the shaft 00. At the commencement of the stroke the reel 72, upon carriage g, is at the front end of the machine, as shownin full lines in the drawings, the finger 7c of the actuating-arm Ztaking in the groove t of the head of the carriage g. Upon the descent of the needle thehook a of the revolving cylinder at takes the thread from the needle and spreads it around the cylinder, and a loop is thus formed through which the cotton reel and carriage may pass. As the drum u revolves, the stud Z on levers travels in the camgroove upon the periphery of same and draws the lever s, which is pivoted at s, as aforesaid, and with it the arm Z and reel-carriage g, to the position shown in dotted lines, the cottonreel and carriage passing through the loop of the upper thread and entering the cylinder a, as shown, the carriage g sliding off the guidepinfonto the guide-pin b. A suitable takeup (not shown) provided on the head of the machine or in other convenient position draws the lock-stich upward between the ends of the pins I) f, and thus completes the stitch at every stroke of the needle. lt he reel and carriage then resume the positionshown in full lines and are ready for the next descent of the needle, when the operation is repeated.

The cylinder a, with hook or looper a, may have either, as above described and sl1own,a rotary motion, or an oscillating or reciprocating motion may be imparted to it, and when desired a suitable varying movement is applicable.

To take oil the reel 7L when empty and re place with a full one a convenient method is to form the bed'plate e of the machine with a sliding portion m (see Figs. 1 and 3) over the front end of the spool-race and to pivot the front pin f of the spool-race in its hearing, as at a. When the sliding portion in of the plate is withdrawn the front pin f may be turned up and the reel or bobbin h can readily be removed and another one substituted. Fig. 4 shows the sliding portion on of the bedplate 6 removed and the front pin f turned up for removalof the reel h. The end of the pin f is let into the longitudinally-tilting block 0, which latter, pivoted at it, upon being depressed, as shown, raises the pinfand reel 71. through the opening caused by the removal of the sliding plate m and allows the reel 7t to be taken off.

The tilting-block 0 is formed with a projection or heel which extends beyond the end of the bed-plate, so that it may be readily reached and manipulated. \Vhen this projection is depressed the inner end of the guide-pinf is swung longitudinally upward until itreaches a substantially-vertical position.

1) is a spring fixed at top of the tiltingblock 0, which when in position is pressed upon by the sliding plate m and tends to keep the front guide-pin fof the spool-race true. (See also Fig. 1).

For convenience, where a reel at hand is too large to pass within the cylinder (L the carriage 9 may be formed (see particularly Fig. 5) with a removable head 0" at its free end, such free end being screw-threaded for its reception. The cotton or thread may then be wound from the reel onto the carriage g, which will thus form a bobbin. Fixed to the sleeve or bush 9 I may have a spring q, as shown in Fig. 5, which when the sleeve or bush 9 is passed through the aperture in the cotton-reel will tend to hold same firmly in position.

These improvements are adapted for use or employment on either top or bottom feed machines and upon most of the machines now in use, and from the construction of the revolving cylinder at and its hook or looper a it may be placed immediately under the bed plate of the machine, thereby enabling a short needle to be employed-always a great advantage when working at high speed.

It will be observed from the foregoing that the shuttle now generally used is entirely dispensed with, the hook or looper on end of the'cylinder spreading the thread and forming the loop and the cotton-reel being in its reciprocations passed through the loop when formed. Hence a great saving in expense is obtained and friction or tension upon the top thread is reduced, the only strain upon same being the weight of a portion of the under or looking thread, and not, as heretofore, having to bear partly the weight of the shuttle or the casing of the under reel, as is the casein the two-reel machines now in use.

Having now particularly described my invention, what I claim, and desire to be secured to me by Letters Patent of the United States, xs

1. In a sewingmachine, the combination of the looping cylinder a carrying the guide pin 12, of a guide pin f, the laterally pivoted and Vertically tilting block 0, swinging longitudinally of the spool race, by which the guide pin f is carried, said block when depressed being adapted to elevate the inner end of the guide pin f into a substantially vertical posithe bed plate having a section thereof remov-- tion, and the sliding sleeve g adapted to slide j a looping cylinder a carrying the guide pin b,

of the guide pin f, the laterally pivoted and vertically tilting block 0, swinging longitudinally of the spool race, by which the guide pin f is carried, the heel or projection connected to said block and extending beyond the end of the bed plate, so that when said heel or projection is depressed the inner end of the guide pin f will be elevated into a substantially vertical position, and thesliding sleeve g adapted to slide upon said guide pins when they are in line with each other, substantially as described.

3. In a sewing machine, the combination of able, of the looping cylinder a carrying the guide pin 6, the laterally pivoted and vertically tilting block 0 swinging longitudinally of the guide pin b and carrying the guide pin f, the spring 1), secured to the upper surface of said block and adapted to bear against the under side of the removable section of the bed plate when the guide pin f is in its lower position, and the sliding sleeve g adapted to slide upon said guide pins, substantially as described.

4. In a sewing machine, the looping cylinder a carrying the guide pin 1), the guide pin f pivotally mounted in line with said guide pin 1), the sleeve g formed with the groove 2' and adapted to slide upon said guide pin, an actuating arm provided at one end with an angular finger is engaging the groove upon said sleeve, a lever s pivoted at one end to the bed plate and at its other end pivoted to said actuating arm, a stud t formed upon said lever 8 intermediate of its ends, a drum u, situated on the power transmitting shaft, a cam groove formed upon the periphery of said drum and into which the said stud t projects so as to transmit reciprocating motion to the sleeve, substantially as described.

DAVID RICHARDS.

Witnesses:

A. G. ELI, GEO. COXHEAD.

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