US621594A - Electrical warp stop-motion for looms - Google Patents

Description

Patelited Mar. 2!, I899.

w. n. BAKER & r. E.'K|P. ELECTRICAL WARP STOP MOTION FOR LOOMS.

(Application flied Aug; 6, 1898.)

3 SheetsS-heet (No Model.)

, Q INVENTORS lfilg-w flwaw d w. 7 EATTORNEY M w w no. 621,594; PatQ n't'ed Ma ZI, I899. w; u. BAKER-6.1. E; m. ELECTRICAL WARP STOP MOTION FOR LOUIS! A umin filed Aug. 0, 1898. v

3 Sheets- 8M 2.

(No loul.

Patented Mar. 2|,- l899.

W. H BAKER 81. F. E. K-IP.

ELECTRICAL WARP STOP MOTION FOR LUOMS.

I (Application filed Aug. 6, 1898.) (No-Model.) 3 Sheets-Sheet 3.

l nna INVENTORS ATTORNEY WlTNESSES:

UNITED STATES PATENT OFFICE.

\VILLIAM H. BAKER, OF CENTRAL FALLS, RHODE ISLAND, AND FREDERIO E. KIP, OF MON TCLAIR, NEW JERSEY, ASSIGNORS TO THE Kl P-ARMSTRONG COMPANY, OF NEW YORK.

ELECTRICAL WAR P STOP-MOTION FOR LOOMS.

SPEGIFICATION forming part of Letters Patent No. 621,594, dated March 21, 1899.

Application filed August 6, 1898.

T all whom it may concern.- I

Be it known that we, WILLIAM H. BAKER, residing at Central Falls, Providence county, Rhode Island, and FREDERIO E. KIP, residing at Montclair, Essex county, New Jersey, citizens of the United States, have invented certain new and useful Improvements in Electrical Warp Stop-Motions for Looms, of which the following is a specification.

Thisinvention relates to the class of devices employed on looms to effect the stopping of a loom when a warp-thread breaks; and the objeot of the invention is in part to provide the stop-motion with an improved terminal drop I 5 adapted to overcome several difficulties encountered in the practical adaptation of such drops to a loom and in part also to overcome a difficulty arising from the breaking of the circuit at the fallen drop by the vibration of the loom before the shipping-lever can be freed.

' By the present invention the instant the drop falls and closes the main circuit an electromagnet or solenoid is energized and acts to shunt out the drop and maintain the circuit 2 5 closed until the going part of the loom can act to free the shipper-lever.

Another feature of the invention is the utilization of the weft-fork carrier and wefthammer to actuate the knock-off lever, as

0 Well'when a warp-thread breaks as when a weft-thread breaks or fails.

Another feature of the invention provides against interference with the take-up mechanism when a warp-thread breaks, thereby 3 5 avoiding a let-off and a defective mark in the 5 Fig. 2 is a plan of the same, and Fig. 3 is a front end elevation as seen from the arrow 3 in Fig. 2. These views are on a comparatively small scale. Figs. 4:, 5, and 6 illustrate the weft-fork carrier F and its appurtenances on a larger scale than the principal views. Fig.

Serial No.68'7,943. (No model.)

4 is a fragmentary sectional elevation on line ac in Fig. 5. Fig. 5 is a plan, and Fig. 6 is an end view from the left in Fig. 4. Fig. 7 is a diagrammatical view showing the main and shunt circuits and the construction of the solenoid. Fig. 8 is a plan view of the knock-offlever and its appurtenances on a larger scale than the principal views, and Fig. 8 is a cross-. section at 00 in Fig. 8.

W represents the warp-beam of a loom; w, the warp-threads; r, the lease-rods; 1-1, the heddles; O, the cloth-beam, and h the wefthamme r. These are common to all looms. Some of the other features of the loom herein shown are also common in looms; but these will be referred to in the description which follows.

1 is a terminal drop adapted, normally, to be supported on a warp-thread w. These drops are arranged in one or more series (two series are herein shown) andhave the leverlike form illustrated in Fig. 1. The drops of each series are fulcrumed on a rod 2,- connected with one pole of a generator 3,whereby all of the drops thereon become terminals. The fulcrum-rod extends across the loom above the warp. Each-drop has in its heada slot 1 to receive the warp-thread on which the drop is supported and has a short arml back of the fulcrum-point to make contact when the drop falls with the under side of the other terminal 2 of the electric circuit. This terminal 2 may be a simple metal rod, extending across the loom, as shown, in the proper position to be put in contact with the shorter arml of the drop, asindicated in Fig. 1, where one of the drops is represented as having fallen. The advantage of this form of drop is that its longer arm or head must descend to a considerable extent before the contact is made with the terminal 2 ,whereby a good degree of slackness in a warp-thread from flying upward and so becoming disengaged from their respective warp-threads, a light readily-removable strip 1 extends across over their heads, as shown in Figs. 1 and 2. This strip may be plain or be corrugated lengthwise to make it stiff as well as light.

\Vhen a drop 1 falls, it closes an electric circuit, and this circuit, by exciting an electromagnet, causes the armature thereof to put an obstacle in the path of the vibrating wefthammer h, thereby causing the latter to stop the loom through the medium of the same mechanism as that which stops the loom when a weft-thread breaks or fails.

Referring to the left in Figs. 1 and 2 and to the detail views, Figs. 3, 4, 5, and S, K represents the knock-ofi lever, pivotally mounted on a bracket B on the loom at the end of the breast-beam, and S is the shipper-lever, which is normally engaged and held by a retaining-notch n in the bracket B, the said lever S being actuated by a spring when released and adapted to play along a slot in the bracket B. -The knock-off lever simply pushes the shipper-lever free from the shoulder at the notch. The nioving end of the knock-off lever engages a keeper in the weftfork carrier F, which carries the weft-fork f, and said carrier, mounted in guides on the bracket B, is adapted to move in a plane at right angles to the plane in which the shipperlever S plays. Normally when aweft-thread is shot the hook f on the rear end of the weftfork is raised out of the path of the wefthammer h; but if a weft-thread fails from any cause the hook on the rear end of the weft-fork descends into the path of the wefthammer, and on the next stroke of this hammer it engages said hook and drives back the weft-fork carrier F, thus actuating the knockoff lever K and through it freeing the shipperlever S; At the same time the lever K is moved out from under a shoulder L on the under side of the handle L (see Fig. 8) of a brake-lever, and this allows the brake to be set automatically on a wheel of the loom, so as to overcome momentum of the parts and arrest the motion of the loom promptly. Also at the same time the knock-off lever K strikes the take-up lever T and releases the catches in the take-up gears, so that the web may slack or run back. All of this mechanism is common to looms as at present used and is described here merely because of its close relation to the novel features of the present application. These latter will now be described.

On the weft-fork carrier F is mounted an electromagnet 4 in circuit with the generator 3 and the drops 1. (See Figs. 4, 5, and 6.) The carrier F is slotted to receive the weftfork, and the shank of the latter, bearing the hook f, may descend in this slot into the path of the head of the weft-hammer 7t. On the carrier F and in this slot is mounted a bent spring 5, the upturned end of which carries the armature 6 of the electromagnet 4 above the protruding cores't of the magnet. Vhere the upright branch of the spring 5 joins the main portion thereof is an angle or shoulder 5, which when the armature of the magnet is attracted and drawn down is depressed into the path of the head of the wefthammer it, so that in the forward or operative movement of the latter it will strike said shoulder 5, push the carrier F forward, and, acting on the knock-off lever K, release the shipper-lever S and stop the loom. will be seen that the weft-hammer may act on either the hook on the weft-fork or the shoulder on the spring 5, whichever may be depressed into its path, and the loom will be stopped in either case; but, as before stated, when the knock-off lever K is shifted by the breaking of a weft-thread the take-up lever T is actuated. Now when a warp-thread breaks it is not desirable that the said takeup lever shall be operated, and to prevent this the device now to be described is employed.

I11 the knock-off lever K is formed a recess 7, Figs. 7 and S, at the point where this lever is designed to impinge upon the take-up lever T, so that if this notch or recess be left open the lever T will enter said recess and not be pressed back by the knock-off lever, and this is the desired condition when a warp-thread breaks; Therefore in order that said recess 7 may be left open or be closed, as desired, the following operating devices are employed:

On the knock-off lever is mounted a solenoid or electromagnet 8, the core 8 of which is attached to a sliding piece 9 of any kind adapted to cover the recess 7 normally to an extent suflicient to prevent the lever T from entering thereat, but capable of being displaced when a current is sent through the coil of the bobbin of the solenoid or magnet, this coil being in the circuit with the electromagnet 4 and the drops 1. Consequently when a warp-thread breaks and a drop falls the coil of the solenoid 8 is excited, its core 8 is drawn in, and the obstructing slide or piece 9 displaced. A solenoid is employed in lieu of an ordinary electromagnet merely because a little more movement of its core can be conveniently obtained than with the armature of a magnet; but this is not material to the invention. An electromagnetof the usual kind may be employed as well.

It is found in these warp stop-motions that when a drop falls and closes the circuit and a little time-must then elapse before the going part of the loo1n-in this case the wefthammer h-can act to release the shipper-leverS the jarring and vibration of the loom may again break the circuit at the drop, thus allowing the loom to run on, at least for several picks. To obviate this defect and when the circuit shall have been once closed to maintain it closed until the loom is stopped, the present invention provides a shunt-circuit which shunts out the drops, and this Thus it shunt-circuit is closed by electromagnetic force, preferably at the solenoid 8 for convenience. This device is illustrated in the diagrammatic view Fig. 7, illustrating the preferred arrangement of the main and shunt circuits and the circuit-closer at the solenoid. In this View the main circuit consists of a conductor 10 leading from one pole of the generator 3 to the drops 1, and aconductor to, leading from the other pole of the generator to and through the coil of the solenoid 8, thence to and through the coils of the magnet 4, and thence to the contact-terminal 2 Consequently when a drop falls and connects electrically the arm 1 of the lever-drop and the terminal 2 the magnets 4 and 8 will be excited; but when the core 8 of the magnet or solenoid 8 is drawn in it will strike a pushpin 10, which will thus be caused to close a shunt-circuit 'by pressing one terminal 11 of said circuit into contact with the other terminal 11 of said circuit. The shunt-circuit, as here shown, comprises a conductor w,leading from one binding-post 4 of the magnet 4 to a binding-post at the terminal 11 and from a binding-post at the other terminal 11 to one pole of generator 3. Thus when this shunt-circuit is closed the drops 1 are cut out, but the generator and the two magnets remain in the circuit, which will remain closed until broken by the movement of the weft fork carrier F. There is a coil-spring S" behind the core in the solenoid to return the core and the sliding piece 9 to their normal positions when the circuit is broken.

Figs. 4, 5, and 6 illustrate the means for breaking the circuit when the carrier F is pushed forward by the knock-01f lever K. One of theconductors (as w leading to the electroinagnet 4 terminates in a fiat contact plate or blade 12, mounted on-a post 13 on the bracket B or on some fixed'part, said terminal plate bein insulated from the bracket. On the carrier F are mounted two contactplates 14, forming terminals of one end of the magnet-coil. Normally when the loom is running the plate or blade 12 is in position between the plates 14 and the contact is perfected; but when the carrier F is displaced by the weft-hammer the circuit is broken by the movement of the two plates 14 out of contact with the blade 12. It is immaterial, of course, what sort of circuit-breaker is employed at this point; but that shown is of an approved form orkind and provides a rubbing contact.

On looms having a warp stop-motion and the accompanying knock-off lever and ship per-lever a brake is employed which is normally held off by the knock-01f lever taking under an overhanging handle on the brakelever, and when the knock-off lever is displaced this displacement allows the brake-to be set so as to check the momentum of the rotative parts of the loom. In the drawings, L represents the overhanging head or handle of the brake-lever. When the shipper-lever S is moved to its retaining-notch for setting the loom in motion, it finds this head L in its path (the brake being set) and carries it back with it, so asto release the brake, and when the lever S shifts in stopping the loom the brake-lever follows it up and sets the brake; but at times it is desirable that the loom be run backward by the weaver, and to do this conveniently he must take off the brake.

Therefore he grasps the handle L of the brakelever and draws it back. As it swings in a curve, the head is highest when the brake is off. In order to hold it off, this invention provides aswing-arm 15, pivetally mounted on the bracket B and its free end 15 adapted to be pushed in under the handle L to prevent its moving into the braking position. On its inner edge, adjacent to the knock-off lever K, the swing-arm 15 has a beveled or cam surface 15 which is impinged upon by the lever S in moving this lever into position to set the loom in motion in such a manner that said lever throws the arm 15 outward and from under the handle L of the brake.

In Fig. 4 is shown a pin 16 across the slot in the weft-fork carrier F and a shoulder or projection 5 on the spring 5 to engage said pin when the shoulder 5 on the spring is in operative position, as shown inthis figure,

so as to providean abutment for pushing back thecarrier. This pin and shoulder are not, however, essentials.

Figs. 8 and 8 show the parts in the position they occupy when the loom has been stopped by thebreaking of a warp-thread and when the weaver has drawn back the handle L of the brake and pushed the end 15 of the arm 15 under it. It may be said here that when the loom is running and the brake of course ofi the knock-off lever K (see Fig. 8) will take under the shoulder LX below the handle L, and thus hold the latter against movement.

The arm 15 is shown as notched'or recessed to provide room for the take-up lever T, but this is only because it is convenient to place this arm in such a position that it must be cut away to allow the take-up lever to project above it. Any form of slide 9 may be employed so long as it will in one position bar the entry of the take-up lever to the reces's or notch 7.

Preferably each lever-like drop 1 will have in it a circular hole or closed opening, whereby it is mounted or fulcrumed on the rod 2, but it may be advisable to have open inclined slots in them to take over said rod, so that they can be the more readily lifted off. Such an open oblique slot is indicated by dotted lines in Fig. 1.

Having thus described our invention, we claim- 1. In an electrical stop-motion forlooms, the

movable strip 1", supported on and carried by the longer arms of said drops, substantially as and for the purposes set forth.

2. In an electrical warp stop-motion for looms, the combination with a main electric circuit including a generator and drops adapted to close said circuit when a warpthread breaks and a drop falls, means controlled by a magnet for stopping the loom, the said magnet, the coil of which is in said main circuit, a shunt-circuit which cuts out the drops, and an electromagnetic device in both the main and shunt circuits adapted, when a drop closes the main circuit, to close said shunt-circuit, substantially as set forth.

3. In an electrical warp stop-motion for looms, the combination with a main electric circuit, including a generator, circuit-closing drops supported on the warp-threads, and magneto-mechanical means controlled by said circuit for stopping the loom, of a shunt-circuit which cuts out the drop, and electromagnetic means, controlled by said main circuit which closes said shunt-circuit whenever the drop closes the main circuit, substantially as set forth.

4. An electrical warp stop-motion forlooms having a series of drops supported on the warp-threads and adapted to close an electric circuit, when a warpthread breaks, and having electrically-actuated means, energized by the closing of said circuit by the drop, which shunt out the drop when the circuit is closed, substantially as set forth.

5. In an electrical stop-motion for looms, the combination with a warp stop-motion, comprising an electric circuit, a generator in said circuit, means for closing a break in said circuit when a warp-thread breaks, and electromagnetic means controlled by said circuit which causes a going part of the loom to actuate the knock-0E lever and thus free the shipper-lever, the said going part, the shipperlever, the knock-0ft lever having in it a recess 7, opposite to the take-up lever T and the said take-up lever, of an electromagnetic mechanism, controlled by said circuit, and a slide controlled bysaid electromagnetic means and normally covering said recess 7, and actuated to uncover said recess when said circuit is closed, substantially as and for the purposes set forth.

6. In an electrical stop-motion for looms, the combination with an electric circuit including a generator, means for closinga normally open break in said circuit when a warpthread breaks, the shipper-lever S, the knockoif lever K, adapted to release the shipperlever, the weft-hammer h, the weft-fork carrier F, connected with the knock-01f lever, an electromagnet 4t, mounted on said carrier and in said circuit, its armature, means substantially as described, actuated by said armature for interposition in the path of the vibrating weft-hammer when said magnet is excited, whereby the weft-ham meractuates the carrier F when a warp-thread breaks, and a circuitbreaking switch actuated by the movement of said carrier to break the circuit, substantially as set forth.

7. In a stop-motion for a loom, the combination with an electric circuit including a generator and means for closing a normally open break in said circuit when a warp -thrcad breaks, of the weft-fork carrier F, the wefthamrner h, the electromagnet 4 in the said circuit, its armature 6, mounted on the spring 5, and the said spring, provided with a shoulder 5 for the weft-hammer to impinge upon when the armature is attracted, substantially as set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

WILLIAM H. BAKER. FREDERIO E. KIP.

lVitnesses:

PETER J. QUINN, JOHN N. BUTMAN.

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