US643021A - Dobby for looms. - Google Patents

Description

No. 643,02I. Patented Feb. 6, |900.

lw. B. WHITE, 1n.

BOBBY FOR LOMS.

(Application led Mar. 18, 1899*) (No Model.)

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" STATES ATEN'I FFICE.

IVILLIAM BELL VHITE, JR., OF COLNE, ENGLAND.

DOBBY FOR LOOMS.

, SPECIFICATION forming part of Letters Patent No. 643,021, dated February 6, 1900.

Application filed March 18, 1899. Serial. No. 709,670. (No model.)

To cr w/wm t may concern:

Be it known that I, WILLIAM BELL WHITE, Jr., a subject of the Queen of Great Britain, residing at Colne, Lancaster count y', England, have invented cert-ain new and useful Improvements in Debby Mechanism for Looms, of which the followingis a full, clear, and eX- act speciiication.

This invention relates to improvements in dobby mechanism of looms for weaving and is designed to simplifythe construction thereof.

The invention has reference more particularly to dobbies of that class in which hooked U-shaped spring-catches are employed for lifting the jacks. Hitherto in this type of dobby two pattern-cylinders have usually been employed, the pegged lags of which have acted direct on the catches, thus necessitating a double :reading of the pattern and involving a considerable complication of the working parts.

The object of the present invention is to simplify the mechanism by the employment of a single pattern-cylinder arranged to act on T-shaped needles, which are operated by the pegged lags of the pattern-cylinder in such a manner as to throw the hooked extremities of the U -shaped spring-catches into position to be raised by the lifting-knives of the dobby.

According to my present invention I em- .ploy two U-shaped spring-catches having hooked extremities, one leg of the U being preferably longer than the other. The short hooked end rests on a stationary projection. Two of these spring-catches are mounted at their U-bends on a small stud on the jack-lever, one of the said catches beingin advance of the other. The studs are on each side of the jack. The said T-shaped needles are arranged to slide in grooves and are operated upon by the pegged lags of a single patterncylinder, and the needles are alternately long and short, the projecting extremities of the long needles acting upon the more distant spring-catches, while the short needles act upon the near catches to bring them alternately in position to be operated by the lifting-knives, as the case .may be, according to the pegging of the lags, and thus retain any particular jack in position for any required number of picks. The hooked extremities of the U-catches are preferably pushed into action by the pegs of the pattern-cylinder forcing forward the needles. The U-catches spring back, into their normal position when the lifting-knife has been lowered. The arrangement may, however, be reversed, the catches being forced out of action by the needles and springing into position on the absence of the peg.v I preferably employ donbl'e jack-levers arranged in a peculiar and novel manner. The first jack-lever-t'. e.,

the one carrying the spring-catch'es-is pivoted at one end and at the other the stave is attached. In the center on each side are the studs, on which are mounted the spring liftin g-catches. The other lever is reversely pivoted at one end and at the other end the stave is attached. A central connection is made between one lever and the other, so that they will be simultaneously lifted and at the same time lift the healds. In a modification the lower lever carries the spring-catches and is formed on its upper edge with a swell which bears against a projection formed on the under side of the upper jack-lever, so as tocause a simultaneous lift of thelevers when the lower lever is raised by the needles, thus dispensing with the links or hooks.

My invention further relates to improved mechanism for operating the lifting-knives of dobbies, with the object chieiiy of preventing a smash or breakage of the working parts in case anything gets stuck fast. On the dobbyframe I mount a two-armed lever, which has a rocking movement imparted to it by the usual rod, operated from a suitable tappet or treadle from the tappet-shaft of the loom. At or near each end of the armed leversI mount a forked or slotted arm, its forked end passin g'through a bridge-piece and being provided with a bowl, whichrests on the end of the two-armed lever, while its other end is connectedtothelifting-knife. Bothforkedarms are similarly arranged by being connected to the respective lifting-knives. Should anything get stuck fast in the working parts, the two-armed lever will continue to work without doing damage, the same being free to move in the forked ends of the arms or levers connected to the lifting-knives.

In the accompanying drawings, Figure lis a detailed view of my improved dobby, show- IOO ing the means for actuating the jack-levers. Figs. 2 and 3 are front and back views, respectively, of the dobby; and Fig. 4 is an end View thereof, showing the lneans for operating the lifting-knives.

Referring to Fig. l, A and B are the U- shaped spring-catches, each of which is made with a long and a short leg. The long leg projects upward and is formed with a catch cXtremityEwhile the short leg is also formed with a bent end or catch F, which rests on a cross-bar of the grate G when in its normal position. The grate G is secured to the inner sides of the dobby-framing, as shown in Fig. 4. The spring-catches are secured at the bent lower end portions of their long and short legs to the jack-lever C by studs D, as shown.

H and J are T-shaped needles, which are acted upon bythe lattice-pegs on the pattern barrel or cylinder K. The needles are notched, as shown, to limit their movement in the grate L, which is also shown in the framing. The long needles .I act upon the spring-catches B, while the short needles II act upon the catches A. The needles are supported in the grates I and L, the grate L also serving as a guide for the spring-catches A and B, as shown.

In Fig. 3 the jack-levers C, which carry the spring-catches, are pivoted at M and their other extremities move in the grate N. From jack-levers C a central link or connection a is made to the jacks C', pivoted at P, so that on the lifting of the jacks O jacks C will be simultaneously lifted, and conseguenti)T the healds attached to them will be raised. The jacks C work in the grate P. The links individually consist of two side plates or blades, which are braced together at the top and bottom by a small stud carrying a small antifriction-bowl, which rests in an indent in the jack-levers C and C'.

In Fig. l the links a and antit'riction-bowls shown in Fig. 3 are dispensed with, and the jack-levers are so mounted and constructed that on the raising of the lower jack-lever it will simultaneously raise the jack-lever above it. In this View the U -shaped spring-catches A and B are shown secured to the lower jacklever C', pivoted at M. The jack-lever C above it is reversely pivoted at O. On the lower jack-lever C is formed a swell orlug O', which when the lower jack-lever is raised by the U shaped spring-catches A and B in the manner described bears against the projection N, cast upon the under side of the j ack-lever C, thereby raising the said lever C simultaneously x with the lever C. By this means I am enabled to obtain an equal lift ofthe healds or harnessattached to the jack-levers in the usual manner. The ordinary toothed jack-levers soon get worn in the teeth, which allows them to drop and give all-manner of sheds, which objectionable feature is got rid of by my present arrangement.

I will now proceed to describe the action of my improved dobby. J ust according to .in dotted lines in Fig. l.

the pegging of the lags on the pattern-cylinder K the needles II and .l will, as the case may be, thrust forward the spring-catches A or B, so that their catch extremities E will come into position to be raised by theliftingknives (land R of the dobby, pivoted at Q', as shown in Figs. 2 and 4. Then the needles l-I and .I are relieved from the lattice-pegs on the pattern-barrel K and the spring-catches A and B arev released, the spring-catches will spring back out of active position, as shown At the same time the spring-catches will cause the return of the needles II and J in readiness to be acted upon by the succeeding pegs of thelattice-barrel. A projecting lip on the said needles limits their return movement by coming against the rod I-I, as shown.

The `operation of the lifting-knives Q and R will next be described. This is effected by rocking lever V, mounted on the stud V', as illustrated in Figs. 2 and 3. This rocking lever is actuated by connecting-rod W, operated' from an eccentric or crank on the tappet-shaft of the loom in the usual manner. Rockin g lever V gives an alternate movement to two arms X, whose ends are passed through slotted brackets Y in rocking lever V and are supported upon the same by bowls Z,

lwhich rest in a slot, groove, or indenture formed in the top edge of such lever. The arms X are connected to respective liftingknives Q and R, which they operate.

It will be evident that should any working part get stuck fast the rocking arm V will l continue to work independently of the arms X, thus preventing any damage.

The lifting-knife R, about midway of its length, has attached to it a branch arm R. l This branch arm R', with the fall or gravity jof the arms X, on being relieved from the rocking lever V operates the two-armed lever S, pivoted at S. (See Fig. 3.) yThe other extremity of the lever` S is connected to another two-armed lever T, centrally pivoted on the shaft T of the pattern-barrel K. Fixed to the lever T is a small link U, carrying pawl or catch U', which engages with the ratchetwheel K and turns pattern-barrel K, a small blade-spring B keeping the catch Uin gear with the said ratchet-wheel.

Having thus described my invention, what I claim isl. The combination, in aloom-dobby mechanism, of the j ack-lever having lateral studs, the vertical spring-catches each formed with a long and a short leg having hooks at their upper ends and joined at their lower ends by a bend engaged with one of said studs on the jack-lever to raise the latter, a second jacklever engaged with and raised by the aforesaid jack-lever, the fixed grating on which the hooked ends of the short legs of the springcatches normally rest, the lifting-knives, the horizontal T-shaped needles having their inner ends bearing against the long legs of the IOO IIO

spring-catches to push them into the paths of the lifting-knives, and the pattern-cylinder for advancing said needles, the spring-catches by their resiliency springing back and restoring the needles to-normal position when the needles are relieved from the action of the pattern-cylinder, substantially as described.

2. The combination in a loom-dobby mechanism, of the vertically-reciprocating knives Q and R, lever devices for operating the knives, the upright spring-catches A and B, having arms of different lengths, the longest arms constructed to be engaged With and raised by said knives, the horizontal reciproeating needles H and J, acting on the long arms of the catches to throw them into the paths of the knives, a pattern-cylinder K, for operating the needles, the jack-lever C', connected with and raised by said spring-catches and the j ack-lever C, engaged with and raised by the aforesaid jack-lever, substantially as described.

3. The combination in a loom-dobby mechanism, of the spring-catches Q and R, having` arms of different length, the horizontally-reciprocating needles H and J, acting on the long arms of the catches, the vertically-reciprocating knives Q and R, for engaging and raising said catches, the rocking knife-operating lever V, having brackets or guides Y, and the arms X, connected with said knives, bearing against said rocking lever and passing loosely through said brackets or guides.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

WILLIAM BELL WHITE, JUNIOR.

Witnesses:

F. RIcHWooD, W. H. TANNER.

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