US729627A - Dobby mechanism for looms. - Google Patents

Description

` t PATBNTEDJUNBZ, 1903.

l J. TQ MEATS & I. Ef GREENSMITH.

` DOBBY--MEGHANISM FDR LOOMS.

APPLIoA'rIoN FILED JAN 7, 1903 NO MODEL UNITED .STATES Patented J' une 2, 1903.

'PATENT OFFICE.

JOHN T. MEATS AND JAMES E.V CRERNSMITH, OFTAUNTON, MASSACHUSETTS, ASSIeNoRS To MASON MACHINE woRKS, or TAUNTON, MASSACHUSETTS, A CORPORATION .or MASSACHUSETTS.

`DOBBY MECHANISM FOR LOOIVIS.

SPECIFICATIONVforming part of Letters Patent No. 729,6 27Q1ated June 2, 1903.

Application filed January 7, 1903.

To all whom, t may concern/..-

Be it knownlthat we, JOHN T. MEATS and JAMES E. GREENSMITH, citizens of the United States, and residents of Taunton, county of Bristol, and State of Massachusetts, have invented an Improvement in Dobby Mechanism for Looms, of which the following description, in connection with the accompanying drawings, is a specication, like letters zo on the drawings representing like parts.

This invention has for its object the improvement of loom-dobbies by the production of novel features thereof, whereby the operation of the dobby as a whole is increased inA accuracy, the life of Certain members thereof greatly lengthened, and the cost reduced, to-A gether with greater ease in assembling and replacement of broken or injured parts.

It is usual to make lthe upright j ack-levers zo and the hooks or latches carried thereby of cast malleable iron, the ends of the lever being bifurcated to receive one end of the hook, the hooks being pivotally connected therewith in various ways. One mode of effecting` the connection is to provide the hook with two" oppositely-extended integral lugs, which are inserted in holes in the bifurcated end of the jack-lever by spreading the Sides ,to receive the lugs and then bending or squeezing the 3b Sides toward each other. This is objectionable because the bending in and out weakens the lever, and, furthermore, thesoft pins or lugs and the holes in the leverwear rapidly, so that accurate pickingV is prevented and mispicks occur by reason 'of the lost motion. If a hook breaks, the spreadin g and squeezing of the bifurcated end of the lever must be'repe ated, when another hook isconneeted therewith. Another arrangement consists of a 4o cast metal hook having an open eye to catch over a transverse pivot-pin cast integral with the bifurcated jack-liever, the hook being held in place by a back-stop on the lever. These pivot-pins wear out rapidly, and when 45 either pin of a jack-lever is badly worn the entire lever must be discarded and replaced by a new one. Other structures are in use, but so far as we are aware they involve the use of Cast metal, usually malleable, for one Serial No. 138,096. (No model.)

or both of the parts referred to, with the pivot-pin integral with either hook or jacklever.

ln our present invention we have provided a very durable pivot connection between the jack-lever and hook of such construction ticularly pointed out in thefoll'o'wing claims.

Figure l is 'a side elevation, partly broken out, of a jack-lever and the hooks or latches connected therewith embodying one form of our invention. Fig. 2 is a'partial sectional view on the line 2 2, Fig. l, taken through the pivot connection and 'withthke latter in elevation. Fig. 3 is anenlarged end view of the removable pivot-pin shown in Figs. 1 and 2. Fig. 4 is a side elevation of the hook detached and Fig. 5 is a Vperspective view of-amodiication of our invention to be referred to.

In Fig. lis shown a part of the jack J upon which is mounted in usual manner the up- `of cheeks in accordance with our invention,

(see'Fig. 2,) the aperture@2 being of greater diameter. A pivot-pin p, herein shown as hollow, is reduced in diameter at oneend at p to leave an annular shoulder 29X, the end p entering easily the `aperture d3 while the opposite end of the pin will enter` the aper- -A ture a2. The length ofthe pinis such that when inserted in said apertures its ends will `lie substantially iiush with the outer faces ,of

the cheeks, and the shoulder 19X will rest against the inner face of the adjacent cheek, as clearly Shown in Fig. 2. The pin isprefpin, to be referred to.

The hook, shown separately in Fig. et, is struck up, stamped, or otherwise formed by suitable dies from sheet metal, preferably mild steel of the requisite thickness, and subsequently case-hardened, the shank 7L being enlarged at one end to form a closed eye hX. At its opposite extremity the shoulder or hook proper, h, is formed, and between the hook and the eye the metal is increased in depth at h2 to be engaged by the pattern-finger or controlling-wire, when in use.

In assembling a hook-and-jack lever the eye end hX of the former is inserted between the cheeks a/ of the latter, the eye-opening h3 being slightly larger than the diameter of the pivot-pin, and the latter is inserted, small end foremost, through the aperture a2 and the eye of the hook, the end p of the pin entering the aperture a3. A conical tool is then inserted in the bore of the pin at the small end thereof and by a smart blow the bore is drifted or enlarged, expanding the small end of the pin laterally to completely and tightly fill or bind in the aperture a3. Thus the pin is rigidly secured at one en d' to the jack-lever and any slight iin or upset portion of the metal which may sometimes be present around the drifted end of the pin overlaps the outer face of the cheek, assisting in retaining the pin in place. The hook rocks or is fulcrumed on the larger portion p of the hardened' pin, and the wear of both parts is reduced to a minimum by case-hardening the same. By means of this pivot connection the use of malleable metal is obviated, with the objectionable bending before referred to, and wear of either pin or pin-holes is done away with.- Should a hook break or become otherwise injured, the pivot-pin can be readily driven out by means of a suitable punch applied to its smaller end, the opposite cheek of the jacklever being supported on a flat plate having a hole therein large enough to receive the larger end of the pin. A new hook can be placed in position and the pivot-pin inserted and expanded, as has been described.`

In Fig. 5 a modified form of our invention is shown, the shank hw of the hook being slotted or bifurcated to present cheeks k12, having enlarged portions or eyes, one cheek having an opening 7x13 for the large end of the pin, while the other cheek has a smaller opposite opening 7L for the reduced end p of the pin. The jack-lever is not bifurcated, but its end am is inserted between the cheeks of the hook and is provided with an opening to loosely receive the larger part of the pin. The small end of the latter is expanded in the opening h, as has been before described, and the pin is thereby rigidly secured to the hook while passing loosely through the jacklever. In the modification the pin will be case-hardened, as before described, and the jack-lever may rbe similarly treated. The bifurcated end of the hook is somewhat distorted in Fig. 5 to more clearly illustrate the construction, and one of the cheeks is broken out for the same reason. 1

Inasmuch as there is practically no wear at the pivot connection between the jack-lever and hook in the construction herein described, it will be manifest that a mispick cannot occur because of lost motion between such parts, and the operation of the dobby as a whole is greatly improved and its accuracy increased.

I-Iaving fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. In dobby mechanism for looms, a hook, an upright jack-lever therefor, and a separate removable pivot connection passed loosely through one member and having a smooth end rigidly fitted in an aperture in the other member. l

2. In dobby mechanism for looms, a hook, an upright jack-lever therefor, one of said members having an eye, and the other member having a pin-receiving opening, and a pivot-pin passed loosely through the eye and laterally expanded to bind in and tightly lit the pin-receiving opening.

3. In dobby mechanism for looms, a hook, an upright jack-lever therefor, one member having an eye and the other member being bifurcated and oppositely apertured, and a separate, smooth pivot connection passing loosely through the eye and seated in the bifurcated member, said pivot connection being rigidly held by frictional engagement in one of the apertures of the bifurcated member.

4. A jack-lever bifurcated at its end and provided with opposite openings, a hook having an eye in one end adapted to enter the bifurcated portion of the jack-lever, and a pivot-pin passing loosely through the eye and entering the openings in the jack-lever, one end of the pin being laterally expanded to bind against the sides of the opening to iiX the pin in position.

5. A jack-lever bifurcated at its end and provided with opposite openings, a hook having a closed eye at one end adapted to enter the bifurcated portion of the jack-lever, and a tubular pivot-pin passing loosely through the eye and seated in the openings in the jacklever, one end of the pin being expanded laterally to bind in and tightly iit the opening and retain the pin in place.

6. A bifurcated j ack-lever having opposite openings of different diameters, a hook having an eye at one end adapted to enter between IIO the sides of the jack-lever, and a pivot-pin and its smaller end expandedto tightly bind in against the inner face of the adjacent'` part of the other opening and retain the pin in place. the jaok-lever- 7. A bifureated jack-lever having opposite In testimony whereof We have signed our pin openings, of different diameters, a hook names to this speeiieation in the presence of 15 5 having a closed eye at one end, and a reinovatwo subscribing Witnesses.

ble, pivot-pin reduced at one end to leave an A r annular shoulder, the larger end of the pin lSPLIRASMITH passing loosely through the eye and entering the larger opening in the j aok-lever and its Witnesses: lo smaller end entering and being expanded in THOMAS G. COX,

the opposite opening, the shoulder resting HORACE A. CROSSMAN

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