US1766744A - Dobby lever for looms - Google Patents

Description

June 24, 1930.- A. A. GORDON ET AL 1,756,744

' noBisY LEVER FOR LOOMS Filed March 21, 1928 Patented June 24 N TE STATES- ALBERT A. eonnon' Am) RO A D M. coon-for woncns'rnn MASSACHUSETTS; ns

SIGNOBSI'IO GROMPTON & KNOWLES LOOM iwonxs or woricesrnn; MASSACHU-. stars, A oomaoim rioiv orivmssncnusmms. r I

OBBY LEVER. non Looms 1 Appiicatienfiieii ti e '21, 1928. .Seria1 No. a63,4 67. V

This invention relates to improvements in dobby levers for looms and it is the gen I eral object of the inventiontoprovide a two-part dobby back leverwhich shall have a bearing portion of a width substantially greater than twice thethickness of the'sheet stock from which the lever parts are made.

Patent to Holmes No. 1,451,828shows a dobby back lever made of two sections of sheet steel'bothof which are substantially similar and are riveted together at points spaced from theends of the lever so that saidsections may be separated to permit ready insertion or removal of a dobby hook.

it is an important object of our present The dobby back lever has a central bearing which receivesfa stud carried by the dobby" jack-or harness lever and as constructed heretofore this hearing has .been substantially double the thickness ofqthe stock of which a single section is made.

Many thousands of dobby back levers made 7 according. to the aforesaidHolmes patent have gone into successful use but there are certain instances Where it is desirable to provide "a bearing somewhat widerthan p that shown in the said Holmes patent and invention to provide the additionalihearing by placing between the two sectionsof the lever a thin metal strip iwhichgis held in position between said lever sections-Q 'The lever as showninthe "said applicae tion is made of two. identical parts} each with an ofiiset atone end and when being assembled a pair of the sections-is placed as they come from the press, one member of the .pair is then turnedend for end about the axis of thebearing as a-center, and is tions is reversed a'space will be delined between the sections by the depressions into which the bearing. strip -mayfbe placed."

'It is 'a'more' detailed object of our present.

invention to provide a depressionin each sectionof the levernwhich shallbe symmetrical about an axis extending trans-V versely of the lever through thebearing. In

- l 1 1.76am I some instances we may, also form .the depression so that the same'is symmetrical i about a longitudinal axis extending through a bearing, but it" is not necessarythat the" depression besymmetrical Withrespect to the longitudinalfaxis. w V With these and other objects which will appear as the description proceeds, our in vention resides inthe combination and arrangement or parts hereinafter described and set forth in the claims. i

In the accompanying drawings, wherein we havefshown a convenient embodiment of our invention.

1 is a vertical section through a dobby equipped with our improved form'of back lever," V I F'g; 2 is a front elevation of'an-improved lever according to our present invention,

Fig. 3 is an end view takenin thedirection: of arrow-:3, Fig. 2, Q f 1 Fig. his a longitudinalisection on line H of'Fig. QbutQwiththe component parts I of the leverinspacedrelationship such as they assume before. assembly,-

Fig. 5 isa detailed verticaljsection on line 5 .'-5 of Figfjl, n 1

Fig.- 6 is a fragmentary view: of'the cell trallp'ortion. of a. lever having a modified form of depression;

L Figs. gf'nd 9 are diagrammatic views of the method of assembling theleverstarting with two ex'actly similar sections; and

Fig 10 shows a "further modification-of the form of.depression-.;

1 Referring to Fig. 1 the .dobby frame 10 is provided withfingers 11 and 'l2 which cooperate, respectively, with lower and upper hooks 13 and- 14. Said'hooks are con nected in pairs to a dobby back lever indicated at L, the upper hookcbeing-posi tioned by means of one of the levers 12 through an upright rod 15." 'Oppositely vention.

the pattern mechanism 18 will. receive.-

periodic angular movements to raise and lower the levers 11 and 12 in proper sequence to provide the weave desired. The dobby has upper and lower cross girts 21 and 22, respectively, whichare he'ldin fixed position and limit movement of the dobby lever to the left as viewed in .Fig. 1. The

harness frames and warpscontrolled therebyare operatively connected to the jacks 20. The matter thus far described is of common construction andwith the exception of the lever L forms no part of our present in- The back levers L are formed of two similar lever sections 30 and 31. As shown. more particularly in Fig. 4 each section has a straight end 32 and anoffset end 33 and the sections are provided with aligning openings 34 to receivelrivets 35. The parts are assembled as shown in Fig. 3 so that there is an offset end 33 at each end of the lever L and it will be seen that these offsets lie on opposite sides of the central line of the lever L as viewed in Fig.3. The purpose of this construction isto afford proper connections with the fingers 11 and 12. By referring to Fig; 5 it will be seen that the lower hooks 13 have direct engagement with the levers lland that the upstanding rods 15 pass between thelevers 11 and extend upwardly in a straight line to have lifting engagementwith the upper hooks 14. The offset in the levers are therefore on opposite sides of the center line because of the fact that the rods 15 must pass between the levers 11. As shown herein the portions of the two sections 30 and. 31 between the ends thereof are substantially straight but they may be formed as shown in said Holmes 'patent so that the ends may be placed under atensionto provide more satis factory bearings forthe dobby hooks. That much of the lever L which hasalready been described may be'similar to thestructure set forth in theaforesaid'I-Iolmes patent.

As previously, stated our invention is more particularly concerned with the main ner of increasing the bearing for the stud 21 and in carrying our inventioninto e ffect we provide each of the sections 30 and 31 with a depression 5O through which-the bearing openings 51 extend. As shown in Fig. 2 the depression is diamondshape so that said depressions are symmetrical about perpendicular axes which are also perpendicular to the axis of the openings of hear around an axis extending longitudinally of the lever but it s symmetrical around an axis transverse of the lever and extending through the center of the bearings 51. A strip'of sheet metal indicated at 61 may be formedof substantially the same shape'as the depression and maybe of such .thickness. as is desired to give the necessary increase in width of the bearing. Said strip is provided with a punched bearing 62 which aligns with the bearings 51.

fhere is but one type of dobby section and in'assembling' the lever two of these sections which are exactly alike will be placed substantially as shown diagram; matically 'in Fig. 7 The upper section will then be given' a one-half turn around its longitudinal axis so that the offset portion 33 will be oppositely disposed with respect to the-corresponding part of the lower section to. assume the position shown in Fig. 8. Said-upper section isthen given a-half revolution around the axis of thebearings 51 or around the center line Gso that the sections riveted, after which a reamerniay be passed through the openings Bland 62 so that the bearing is made smooth. and free from burrs. If the strip 61 has been proo erly formed it will be held Very tightly in t e depressions by the rivets 35 and the fact that it is of non-circular form will prevent thesame from turning to become, improperly positioned with respect to the dobby lever. The strip 61 preferably fills the'cavity formed between the, sections by the oppositely extending depressions.

As shownin Fig. .10 we may make the depressions elliptical, as at 'TO, with the long axis extending longitudinally of the lever and the short axis transverselythereof. A bearing strip 71 is formed to fit into and substantiallyfill thedepres'sions 70. 1

It is preferable to havethe depressions non-circular and they. must be symmetrical about a transverse axis which passes through the centerof the bearing QB due to the fact that one of the sections is rotated about the 7 axis, of the bearing one-half aturn in the depression into each section or member of the lever .in' such a way' that the depression is symmetrical with respect to a transverse axis. Furthermore, a single type of section may be used because of the fact that in the assembly of the lever one section or member is turned endfor end and then inverted relatively to the other member, orin vother words, one member is given a half turn about two mutually perpendicular axes one of which is the axis of the bearing of the finished lever. It will further beseen that the depression may be symmetrical about a longitudinal axis although this. feature is not essential and it will also be noted that the depressions and the plate or strip 61 located therein are non-circular and that'the plate is so formed as to be held tightly in position when the two sections or members are riveted together. The horizontal dimension of the depression is preferably sufficient portion, each section formed with a non circular depression to provide a bearing portion out of the plane of the body portion, said depressions facing each otherand being symmetrical about a transverse axis, a noncircular bearing element substantially filling the cavity formed by the depressions, said tion for the lever, and means extending through the body portions at spacesremoved from the widened: bearing portionto hold said sections together thereby leaving the sides of the widened portion smooth.-

In testimony whereof they h'ave hereunto aflixed their signatures.

ALBERT A. GORDON. ROLAND MLCOOK.

to require contact between the broadened portions of the leversfor the extreme positions of the dobby back levers when one of them is in the position shown in3Fig. l and the adjacent lever is moved by having one or the other of the hooks connected thereto moved to the right.

Having thus described our invention it depressions forming a widened bearing por- V will be apparent that changes and modifi-' cations may be made therein by those skilled in the art without departing from the spirit 1 r and scope ofthe invention and we do, not

wish to be limited to the details herein dise closed, but what we claim is:

1. A dobby back lever formed of two substantially similar sections each with a body portion, each section formed with a non-circular depression to provide a bearing portion out of the plane of the body portion,

said depressions facing each other and being symmetrical about a transverse axis, anoncircular bearing element substantially filling the cavity formed by the depressions,

and means passing through the sections at points removed from the non-circular depressions andbeing the sole means for holding said sections together. I

2. A dobby back lever formed of two substantially similar sections each with a body portion, each section formed with a non-' circular depression to provide a bearing portion outof the planeof the body portion, said depressions facing each other and being symmetricalabout a transverse axis, a noncircular bearing element substantially filling the cavity formed by the depressions, and means to hold the sections together to prevent relative angular movement thereof in a direction parallel to the planes of their bodyportions, said means passing through parts of the body portions other than those in which the depressions are formed. 7

3. A dobby back lever formed of two substantially similar sections each with a body

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