US503468A - Let-off mechanism for looms - Google Patents

Description

(No Model.) 2 Sheets -Sheet 1.

A. D. EMERY.

I LET-OFF MEGHANISM FOR Looms, No. 503,468. Patented Aug. 15, 1893.

(No Model.) 2 Sheets-Sheet 2. A. D. EMERY.

LET-OFF MECHANISM FOR LOOMS.

N0. 503,468. Patented-Aug. 15, 1893.

'h 3 ewbdm UNITED STATES PATENT OFFICE.

ABRAM D. EMERY, OF TAUNTON, MASSACHUSETTS.

LET-OFF MECHANlSM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 503,468, dated August 15, 1893.

Application filed December 2, 1890. Renewed January 19,1892. Again renewed December 1, 1892. Serial No. 453,695.

(N0 model.)

Looms, of which the following isa specification.

This invention relates to let off mechanism 1n which a worm gear is employed to impart the unwinding motion to the warp roll, and

in which the motion to set a driving pawl, and to at the same time store up in a spring the force required to operate such driving pawl, and thereby enable it to actuate the Worm gearing, is derived from the motion of the Whip roller induced by the upward strain of the warp threads upon the inner bar of the Whip roller at the instant of thebeat.

The accompanying drawings of the let-off mechanism, and so much of the adjacent portions of the loom structure as suffices to illustrate the construction and mode of operation of the invention, are as follows:

Figure 1 is a side elevation. Fig. 2 is a horizontal section taken through the plane indicated by the line on a: on Fig. 1. Fig. 3 is a vertical section taken through the plane indicated by the dotted line yy on Figs. 1 and 2.

The drawings represent the frame, a, of an upright loom for weaving into two fabrics, side by side, the warp threads fed froma single warp roll, I), over asingle whip roller, 0, and across and between two systems of lease rods, (1, d, by which the warp threads are divided into four equal groups, C1, d d (1 as described in pending application Serial No. 367,488, filed October 9, 1890, renewal No. 416,915, of January 4, 1892. The shaft or trunnion, c, of the whip roller, 0, has affixed to it the downwardly-extending radius arm, 6, the lower eX tremity of which is provided with two laterally-extending ears, 6 and c one of which, c, is transversely perforated to admit of the extension through it of one end of the setting rod, f, the other end of which is pivoted to the radius arm f, projecting inwardly from the pawl-carrying sleeve F, loosely mounted upon the lower end of the vertical worm spindle, G. The sleeve F is also provided with a radius arm f to which is attached one end of the contracting spiral spring F, the other end of which is secured to the frame of the loom. The contracting force of the spring f 3 holds the radius arm f against the end of the adjustable horizontal stop bolt, f, extending through a hole tapped transversely through an arm, f projecting downward and outward from the frame of the loom; the bolt f being provided with a jam nut, f, by means of which it may be secured in the position to which it may have been adjusted. Another radius arm, f projecting outwardly from the sleeve, F, is provided with an upright stud to which is pivotally attached a driving pawl, f the free end of which, by means of the spring f is pressed against the periphery of a ratchet wheel, g, which is affixed to, or formed in one piece with, the hollow shaft, g, of the worm g engaging the worm wheel, 9 aifixed to the counter-shaft g", to which there is also aifixed the pinion g, which meshes with the teeth of the cog-wheel, g, affixed to the shaft of the warp roll. At the instant of the beat, the backward sway of the radius arm, c, carries the ear 6 into collision with the setting rod, f, and by rocking the sleeve F upon its axis, swings back the driving pawl f causing it to ride over a greater or less number of teeth of the ratchet wheel, g. After the beat has taken place, the radius arm, e, swings forward, and the sleeve F is thus released to the action of the contracting spiral spring, f which by its contracting force rocks the sleeve F, and by the engagement of the pawl f with the ratchet wheel 9, imparts motion to the worm 9 which motion continues until the radius arm f strikes against the end of the adjustable stop bolt, f By this partial rotation of the worm the desired amount of unwinding motion is imparted to the warp roll. It will be seen that the extent of such motion may be varied by varying the position of the adjustable stop bolt. Thus, if the stop bolt be unscrewed, the radius arm f will be permitted to swing for ward, and the free end of the setting rod, f, will thereby be carried into a position in which it will be sooner engaged by the ear e of the radius bar c, so that a larger proportion of the backward swinging movement of the radius bar, e, will be communicated to the setting bar f, with the consequent result that the driving pawl will be drawn backward over a greater number of teeth .at each loeat. On the Q -hQr-Ahaind, by screwing in thread; astable stop bolt f thetsetting rod, f, will be carried forward, and the collision of its free end with the ear 6 will be postponed to a later stage in the backward swinging movement of the radius bar e, and-a less rangeof setting motion will thereby be communicated to the driving pawl f so that after-the beat fOPlOQIlIS herein described, the same consist I i-ng, essentially,-of =a =worm for imparting. mo-fl tionto the train (if-gearing by iwhichthewarp roll is unwound, a ratchet wheel affixed to the ing theteeth-of said ratchet-wheel, spring for forcingsaid-driv-ing pawl forward against theratohet toothron which it bears, a-radius arm connectedtothe sleeve of a said pawl, a

stop arranged in, the path ofimotion of said radiusarm for arresting the backward motionof said driving pawl and thereafter holding th sam :againstthe'foroe ofsaidspring,

.asettin-gbar, for hearing at one-end against the: said radiusarm connected to said sleeve,

and for receiving; at its opposite end the impact ofaradiusarm a-flixed zto the-shaft of the whip roller for governing the tension of the Warp threads, and; thereby-trans1nitting motion derived from the beat to set back said driving pawl and store up in said spring force to actuate the let-off gearing at the conclusion of the beat.

2. A worm shaft, constituting the prime member of a train of gearing for imparting unwindingmotion to the warp roll of a loom,

a ratchet wheel affixed to said shaft, a drivin g pawl carried upon a sleeve loosely mountedupon said shaftandadapted.to engage the teeth of said ratchet wheel, a spring'for giving the forward or drivingmotiontosai'ddriving pawl, a radius arm affixed to the whip -roller shaft, a setting bar; for transmitting at the instant of-the beat, motion derived from said whip roller toroek said sleeveand therevby set back said drii" g -paw1,;andooincin y stor sup, insai ep ing se a lditional ingthestage in the swinging motion of-sa-id radius arm aftiXed'tosaid-whip roller-shaft at which its motioniscommllniceted tosaidqset v ,s amount "of:t'or.cefor:reactinga pon said ;driv-' ing -pawl,- inoombi-nationwith ,a movable-stop -for arresting the forward oraotrmting movement ofsaid driving pawLandtherebyvary- 6o ting bar, :and hencevarying therange 0f ;set- I tingemovcmentimparted tosaiddrivingpawl, and oonsequently tlieyrange ofauuwindingmotion oommunioatedto the awarpt roll.

ABRAM D. EMERY.

Witnesses;

LI-I. .JJFULLEB,

W. 'TQEMERY.

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