US607838A - Chusetts - Google Patents

Description

No. 607,838. Pa tented July 26, I898.

w. F. DRAPEB & J. H. NORTHROP.

LOOM.

Application filed Dec. 30, 1896.)

(No Model;) 2 Sheets-Sheet. I.

No. 607,838. Patented July 26, I898.

W. F. DBAPER 8|. J. H. NORTHRDPL 2 Sheets-Sheet 2.

L O 0 M (Application filed Dec. 30, 1896.) N o M o d e I.)

ZbZZlcuwlL'Oraper UNITED STATES PATENT EErcE.

\VILLIAM F. DRAPER AND JAMES H. NORTHROP, OF I-IOPEDALE, MASSA- OHUSETTS, ASSIGNORS TO THE NORTl-IROP LOOM COMPANY, OF SAME PLACE AND SACO, MAINE.

LOOM.

SPECIFICATION forming part of Letters Patent N0. 607,838, dated July 26, 1898. Application filed December 30, 1896. Serial No. 617,441. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM F. DRAPER an d JAMES H. N ORTHROP, of Hopedale, county of Worcester, State of Massachusetts, have invented an Improvement in Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts. 7

This invention relates to take-up mechanism for looms wherein provision is made for letting back the take-up on a double action or operation of the weft-fork or filling-detector, which latter operates at every other pick to detect presence or absence of the filling, as is very common in looms.

In the Northrop type of looms provided with automatic filling-supplying mechanism to provide the shuttle with a fresh supply of filling upon exhaustion or failure of the filling at times there will be a pick or perhaps two picks of filling absent in the cloth before the filling-changer can operate to properly introduce a fresh supply of filling to the shuttle. The take-up mechanism under control of the weft-fork is usually arranged to let back two or more teeth at such times to prevent making a thin place in the cloth, and should the filling-changer operate improperly and the shuttle misthread evident-1y there will be still greater opportunity for defects in the cloth.

Our present invention has for its object the production of means to prevent taking up the cloth when the filling is absent for part of a pick, and also when the loom misthreads or fails to thread the shuttle properly when the filling is changed. This is effected by arranging the detent-pawls of the take-up so that they may allow the take-up to let back twice in succession, it being remembered that the -weft-fork has a detecting motion at every other pick of the loom, and when the loom is running properly the take-up pawl acts at every pick. The usual take-up cannot act twice in succession when letting back two or more teeth, the take-up operating every pick, as it takes more than one pick to reset the detent in proper working condition.

Figure 1 is a partial sectional View of a sufficient portion of a loom to be understood,

showing the train of gears for the take-up mechanism and with our invention applied thereto. Fig. 2 is a partial front elevation of the mechanism shown in Fig. 1 at the lefthand side of the loom. Fig. 3 is an enlarged detail View, in side elevation, of the detentpawls in the posit-ion shown in Fig. 1. Figs. 4, 5, 6, and 7 are similar views showing different positions of the detent-pawls, to hereferred to; and Fig. 8 shows the pawls in the position assumed after the second detecting operation of the weft-fork.

The loom-frame A, the lay A the breastbeam A, the weft-fork Z7 pivoted at Z2 on a slide b movable in a stand 6 mounted on the breast-beam, the projection c at the rear end of the slide against which normally acts a lever 0 pivoted at o and jointed by a link 0 to an arm 0 of the rock-shaft or operatingshaft d, and the weft-ham mer A and its connected operating-lever A are and may be all substantially as shown in United States Patent No. 529,943, dated November 27, 1894, wherein like letters are employed to designate like parts.

The usual ratchet-wheel a of the take-up mechanism, connected by a train of gears to the take-up rolls in well-known manner, is operated by a pawl a on a pawl-carrier a actuated by a earn a to rotate in suitable manner, the pawl-carrier being extended forward at a, Fig. 1, for a purpose to be described.

A bracket B, suitably secured to the loom side, is provided with a stud B on which is pivotally mounted the main detent f and two longitudinally-slotted let-back pawls g and h, the detent having a lug or projection f thereon, over which the end a of the pawl-carrier a normally slides.

The detent f is shown as having an upturned web f secured to or integral with it, leaving a slot-like opening between, in which the letback pawls g and h play, the detent being upturnedto form an arm f in the path of a finger 0 fast on the lower end of the lever. 0

r The let-back pawls gandh have 9 3 of different lengths, the pawl h being'slotted to let back two teeth of the ratchet-wheel, while the slot in the pawl g lets back four teeth, so that the longer slot in the latter pawl permits a double operation of the pawl h.

The pawl g engages the ratchetwheel Lt back of the detent f, and the stud b is extended through the longitudinal slot g in said let-back pawl g, while the pawl h engages the ratchet-wheel between the pawl g and the detent f,'as clearly shown in Figs. 1, 3, 5, 6, and 8, the stud b being extended through the longitudinal slot h in the pawl h, it being clear from the drawings that the slot h is the shorter.

A dog is pivoted at 7t" on the portion f of the detent f, having a stop-pin 70 to enter a groove f in the party, a spring 5 normally depressing the dog into the position shown in the drawings, the pin 70 limiting the downward movement of the dog. The free end of the dog is hooked at 70 to be at times engaged by a hook h2 on the pawl h after the first detecting movement of the weft-fork, the latter having a detecting movement at every other pick of the loom.

In the operation of the apparatus upon failure of the filling the weft-fork b will not be tipped and the end a of the weft-fork slide b acts upon the lever 0 turning it to move the finger 0 rearwardly, Fig. 1, the said finger in turn engaging the arm f and raising the detent f from the ratchet-wheel a. At the same time the lug f acts to lift the pawlcarrier at and disengage the actuating-pawl a from the ratchet-wheel, so that the latter is free to turn backward, the pawl a being thus prevented from operating on that pick. When the ratchet-wheel is thus released, it turns back the pawls g and h sliding on the stud b until the lower end of the shorter slot h brings up against the stud and the letback of the cloth is stopped, (see Fig. 4,) the ratchet-wheel having been let back two teeth in this instance, the movement of the pawl 77. bringing the hook 7L thereof into position below the hooked end k of the dog 70, when the detent f returns to normal position at the next pick, such position off being shown in Figs. 1, 2, and 3.

The position of the parts shown in Fig. 4 is assumed on the detecting-pick of the 100111, and on the next pick the filling-fork does not detect.

hooking into it, and the dog would be in the position shown in said Fig. 5 until operation of the actuating-pawl a, just referred to, to take up one tooth of the non-detecting beat of the lay. This taking up of the one tooth moves the pawls g and h forward one tooth,

or from the position shown in Fig. 5 to that shown in Fig. 6, such forward movement of the let-back pawl 71. carrying its hooked end far enough forward to permit the spring 8 of the dog to depress the latter and bring its hooked end 70 into engagement with the hook 7L2. If the filling-carrier was not properly inserted in the shuttle or a misthread occurred, the weft-fork would not be tipped on the third pick of the loomthat is to say, on the pick following the one wherein the parts assumed the position shown in Fig. 6-and on such failure of the filling the detent f will be lifted as before; but this time the engagement of the dog 70 with the pawl It will cause the latter also to be lifted, disengaging it from the ratchet-wheel, as shown in Fig. 7, and the wheel will turn back until the lower end of the longer slot g in the pawl g meets the stud b letting back three more teeth and holding the ratchet-wheel at that point, the ratchet having thus been let back a total of four teeth altogether. At the next or nondetecting pick the detent-pawl is lowered, the parts assuming the position shown in Fig. 8, and the pawl a will on such pick move the ratchet-wheel forward one tooth, and such movement, acting on the point of the pawl h, will move the latter forward sufficiently to release the hook 72. from the dog 70, and thereafter both pawls will slide forward to normal position (shown in Fig. 3) as the ratchet-wheel is moved forward tooth by tooth.

Of course it the fillingis absent for one pick the cloth will be let back for a distance controlled by the pawl h, and the pawl g will not exercise any control upon the ratchetwheel.

So far as we are aware it is broadly new to control the take-up mechanism of a loom by the double or successive operation of the weftfork in the manner hereinbefore set forth to thereby regulate the amount of let-back according to the number of picks in which the filling fails, and our invention therefore is not limited to the precise construction and arrangement herein shown.

Having fully described our invention, what we claim, and desire to secure by Letters Patent, is

1'. In a loom, take-up mechanism, including a ratchet-wheel, and a plurality of successively-operative let-back pawls to engage said ratchetwheel, combined with a weftfork, and means controlled by double operation of said weft-fork to render one of said pawls inoperative and thereby permit the other pawl to operate, substantially as described.

2. In a loom, take-up mechanism, including a ratchet-wheel and its detent, a weftfork, and connections between it and the detent, operative upon failure of the filling to disengage the detent, combined with two letback pawls to successively control the ratchetwheel, and means to disengage the initiallyacting pawl upon a double operation of the weft-fork, substantially as described.

3. In a loom, take-up mechanism, including a ratchet-wheel and its detent, a weftfork, and connections between it and the detent, operative upon failure of the filling to disengage the detent, combined with two independently-operative let-back pawls to suecessively control the ratchet-wheel,and means governed by release of the detent to disengage the initially-acting pawl upon a double operation of the weft--fork, substantially as described.

4:. In a loom, take-up mechanism, including a ratchet-wheel, and its actuating pawl and detent, a weft-fork, and connections between it and the said pawl and detent, to render them inoperative upon failure of the filling,combined with a plurality of successivelyoperative let back pawls to control the ratchet-wheel one after the other, and means carried by the detent to disengage the initially-acting let-back pawl upon a double operation of the weft-fork, substantially as described.

5. In a loom, take-up mechanism, including a ratchet-wheel and its detent, and two let-back pawls engaging said wheel at difierent points back of the detent, said pawls being longitudinally movable different distances on a common support, combined with a weft-fork, connections between it and the detent, to release the latter upon failure of the filling, and a dog on the detent, to engage and move the initially-acting pawl upon a double operation of the detent, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing Witnesses.

WILLIAM F. DRAPER.

JAMES H. NORTHROP.

Witnesses:

HERBERT S. MANLEY, GEo. OTIS DRAPER.

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