US973344A - Let-off mechanism for looms. - Google Patents

Description

J. V. OUNNIFP;

LET-OFF MECHANISM FOR LOOMS.

APPLICATION IILED SEPT.7, 1909.

Patented Oct. 18,1910.

UNITED STATES PATENT OFFICE.

JOHN v. GUNNIFF, or FALL RIVER, MASSACHUSETTS, ASSIGNOR To WILLIAM F. DBAPEB, or norEDALE, MASSACHUSETTS; CLARE H. DRAPER AND OLIVER H, LANE EXECU'IORS or SAID WILLIAM E. DRAPER, DECEASED.

LET-OFF MECHANISM FOR LOOMS:

Specification of Letters Patent.

Patented Oct. 18, 1910.

To all whom it may concern:

Be it known that I, JOHN V. CUNNIFF, a citizen of the United States, residing at Fall River, in the county of Bristol and State of Massachusetts, have invented an Improvement in Let-Off Mechanisms for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The invention to be hereinafter described relates to let-oil mechanisms for looms, and more particularly to the type known as friction let-offs.

- is effected automatically Tl1e.aims and purposes of the present invention are to provide a let-off Inechanism wherein the adjustment of the warp tension by a.' combination of the results due to the decreasin weight and diameter of the yarnmass as t e beam unwinds, and is d'es'i ned as a simple form of such device, as wi l hereinafter more fully appear.

The following description and accompanying drawings 'disclose one form or em.- odiment of means for carrying the present invention into practical effect, it' being understood that the invention in its true sco e i is not-restricted to the particulars or detalls broken away,

except as hereinafter pointed out by the claims.

In'thedrawing: Figure 1 is a side view,

' showing the loom frame, the warp beam and the features ofth'e present invention as related thereto; Fig. 2 isa rear elevation of one end. of the warp beam and a part of the loom framing with the'present invention as- 3 1s a sectlonal detail on the line 3-3 of 1 with parts The loom frame 1 may be ofany suitable character and, if desired, it may be' provided with the whip roll supporting brackets 2 seen-red to the loom frame asiby' bolts 3, said brackets being provided with a series of sockets 4 to sup ort'the whip roll-5 in desired position, it being understood that while the present 'drawin s show only one end of the warpbeam an adjacent framin the other end and'adjacont arts may e and preferably-are duplicates't ereof. I l

,The loom frame 1 is provided with a sup-- porting, bracket 6, preferably, though not necessarily, extending inwardtherefrom, to

that

wardly extending arm 10 of the bell crank is formed asa bear-mg to su'pport'the journals of the warp beam, while-the other arm 11 of the frictional retarding devicels pro vided with a friction pad 14 adapted to bear upon the head 12 of said beam, the construction being such that the friction pad 14 will be pressed against the'head 12 of the Warp beanrwith a degree of pressure dependent upon the weight of the warp beam and its load.

- The warp beam 13 has journals 15 pro jecting from the endsthereof, and means are provided to adjust the point of transmission of the weightof the warp beam and its load to the bearing arms 10 of the frictional retarding device. As one means for varying this point of transmission and consequently altering the leverage or frictional retarding effect of the beam, the journals 15 o the warp beam are provided with an adjustable'bearing collar 16 preferably splined thereto, as indicated in 'Fig. 3, and held in adjusted osition longitudinally thereof bymeans 0 a set screw pad 14 on the warp -17 or the like, the construction being such that, upon adjustmentvof the bearing collar 16 to difierent points on the journals 15 of the warp beam, the frictional retarding effect ofthe pad l4;'onthe warp beam will be ment be carried by the journals of the war beam or. by .the bearing arms 10 of sai frictional retarding device. It will like wise be obvious that while the frictional retarding device may be formedas a-bell.

crank lever, such as herein indicated, its form may be variously changed, the essenthe warp beam delivered upon one portifals inthis respect being that the weight. o

vice may be transmitted to the Warp tion of thelever or frictional retarding debeam in a manner to retard its rotation In proportion to the weight ofi'he warp beam and its load.

From the construction described it will be apparent that when a pull ortension is placed upon the warp threads 18 which pass from the warp beam over the whip roll 5, such tension will tend to rotatethe war ing' effect 0 the frictional retarding device,

whi'ch is itself dependent ilIpOn t-hexweight uniform tension wil wagrp'threads as the warp .a fullto empty condition.

of the beam and its load. I As the warp beam unwinds itryill likewise. be obvious that'its weight will decrease, while at the same time 'the'leuerage or pull-exerted by the tension of tl ie .iw-arp threads will be correspondingly less',;,;the effect bein be placed upon the beam passes from- By the 'a just-able means for transmitting the weightof-thewarp beam and its load to the frintio'nal retarding device, proper adjustment may bemadefor the var-'ing conditions of use. lat is claimed is: v 1. In- 'a friction let-ofl"mechanism for looms, the'comb'ination of a warp beam, anda frictional'retarding device to automatically govern the rotative-movement of the .warp' beam in proportion to the weightthereof and comprising a lever pivoted bea bearing tportion to sustain the tweenits ends to form two arms, one having warp beam and the other arm. of said lever having a portion to engage the beam. v 4

2. In aafI'1Ct1OI1 let-.ofi mechanism for looms, the combination one arm extending from its'fulcrum to sus- Il tain the warp beam, and another arm ex- :te'ndin'g from the fulcrum in another 'direc engagethe e'rn' the rotative movementof ,movement of the warp the/weight thereof sustained 'hy the first .tion and carrying a member bearing directlg;

fupon the-warp beam'to control -.the rotative beam according'to mentioned a'rm. r

1'3. In a. friction'letf-ofi' jmechanism for; looms, the=combinationof a warp beam, and

a; lever fulc'rumed between-its ends on. the loom frame and'having two arms, one to sup rt the'zwarp beam andthe other exrection, and'p'rovided with a friction pad to head-of the. .warp bea m and govproportiontoits weight. w

4.. In africtionlet-01f mechanism looms, the cgmbination of a warp. "beam, a

le rer afulcruined on the loom frameand. havf ingjon'e arm -forfsustaining the warp-beam means fori-adjusting'ithe pointof support beam, beam in op osition to the frictional retar that a substantiallyofa warp beam, a] lever-pivoted between its ends and having;

tendiilg from the fulcrum in a different di-.

the beam I,

the war beam on said arm, and another arm acting irectly upon the head of the warp beam to govern its rotation in proport on to the eifective weight of the warp beam.

5. In a friction let-off mechanism for looms, the combination of a warp beam having journals, .a lever fulcrumed between its ends onthe loom frame and havin a bearing arm to sustain a journal of the warp and another arm acting on the warp beam to govern the rotative movement of ,the warp beam in proportion to the efl'ective' weight sustained by I the bearing arm, and means for adjusting the point of support of said journal on the bearing arm.

6. In a friction let-off mechanism for looms, the combination of a warp beam having journals, a lever ,fulcrumed on ,the loom h frame and having a bearing-arm to sustain a journal ofv the ,warp beam, and another arm acting to govern therotative movement of the .warp beam in proportion to the effective weight sustained by the bearing arm,

7.- In a friction let 40a mechanism for frame and having a bearing arm to sustain the warp beam, the'other arm of said bellcrank lever acting on the head of the warp beam to retard the rotative movement of the and an adjustable collar mounted on. the

journal and interposed between the journal and bearing arm.

' looms, the combination of a warp beam, and 1 J'a bell-crank lever fulcrumed on the machine warpbeam in proportion to the weight of said beam transmitted to the bearing arm.

8. In a friction let-off ,mechanism for looms, the combination of a warp ,beam, a

lever pivoted between its ends on the loom frame and havlng a bearlng arm for sustaining the journal'of said beam, and an adjustable block movable along said bearing arm and interposed between it and the-warp beam journal, the other arm of said lever looms, the combination of "awarp beam, a

be m,

said arm of the lever, the other arm'of said lever extendingfrom. the ftilcrumin adif ferent direction warp beam.-

"and bearing, against the? f- M In testimony whereof, I liave'signed my j.

name to this specification, in the presence of two subscribing witnesses. v

. I YJQHNGUNNI F witnessesi I S; .W.- 1Asn'rb 'JoHiv Bncxrlnv.

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