US861945A - Dobby mechanism for leno-weaving. - Google Patents

Description

No. 861,945. PATENTED JULY 30, 1907.

I J. B. BOLTON.

DOBBY MECHANISM FOR LENO WEAVING. APPLICATION FILED 001211, 1008.

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J. B. BOLTON.

DOBBY MECHANISM FOR LENO WE AVING.

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I anvqnl'o'n L171 UNITED STATES PATENT OFFICE.

JOHN B. BOLTON, OF NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO DRAPER COMPANY,

' OF I-IOPEDALE, MASSACHUSETTS, A CORPORATION.

DOBBY MECHANISM FOR LENO-WEAVING.

Specification of Letters Patent.

Patented July so, 1907.

Application filed October 17,1906. Serial No. 339,881.

To all whom it may concern:

Be it known that I, JOHN B. BOLTON, a citizen of the United States, residing at New Bediford, in the county of Bristol and the State of Massachusetts, have invented a-new and useful lmprovement in Dobby Mechanism for Leno-Weaving, of which the following is a specification.

This invention relates to a loom attachment and comprises a two part jack, half of which continues the full length of the throw while the other half returns.

One of the objects of the invention is to obtain the requisite half and return motion without the aid of gears and cranks.

A further object of my invention is a device that will also weave a leno top warp.

My invention consists in the novel features of construction and combination of parts hereinafter described, particularly pointed out in the claims and shown in the accompanying drawings, in which:

Figure 1 is an elevation showing attached to a loom my improvement, certain positions of the lever being shown in dotted lines. Fig. 2 is a detail view, in elevation, of my improvement, detached. Fig. 3 is a perspective view of the jack. Fig. 4 is a perspective detail view of a link, and, Fig. 5 is a perspective view of a trip segment.

In these drawings A represents the dobby frame of a loom having my improved leno motion attached there to. From a suitable harness frame B a cord B extends over a pulley B'-.and is connected to the harness lever O by means of the usual form of loop O. My improved jack is shown in detail in Fig. 3 and comprises the bar D having formed thereon on one side, and intermediate its ends a Web D. A circular boss D is formed on the bar or jack D and also extends over the web D, intermediate the ends of the same, the boss being situated equi-distant from the ends of the jack D. The boss D is provided with a suitable bore D into which projects a suitable stud from the harness lever G, to which the jack may be pinned or held in any suitable manner. The jack is provided with perforations, D D above and below the boss D and the web D is also perforated as shown at D. I further provide two link arms E, identical in construction, perforated adjacent each end, and also perforated adjacent the lower end, the end perforations being shown at E and the third perforation being shown at E These arms are placed in reverse position, one of them being pivotally connected to the web D above the boss D and the other arm having an end pivotally connected to the web D below the boss D Curved segments F pivotally connect the arms E to the jack D, one end of the segments being pivoted directly to the jack, the pivot pins fitting in the perforations D D and the outer ends of the segments F are pivotally connected to short links F which in turn have their other ends pivotally connected to the respective link arms E at E As stated above the arms are arranged in a reverse position so that the link F is pivoted to the lower of the arms E at a greater distance from the pivotal connection of that arm to the web D, than the pivotal point E and the pivotal point of the web D on the upper arm E. Each of the segments F has formed thereon an angular projection F adapted to be engaged by a fixed, spring tripping finger G. A flat, compound curved spring H is arranged substantially parallel to the web D and intermediate its ends bears on the boss D while the ends of the spring bear on the upper arm E adjacent the pivotal connection of that arm and the link F, and the opposite end of the spring H bears on the arm E below the boss D adjacent the pivotal point of that arm and the web D.

In Fig. 1 I have shown two dotted positions numbered respectively 1 and 2, said positions beingtaken by the harness lever, position 1 being the position occupied by the lever with the ordinary jack, and the full line position and dotted position number 2 being the positions taken by the said lever with my improved form of jack.

The ends of the arms E, opposite the ends pivotally connected to the web D, are connected to the usual hook members K. In this construction the reciprocating movement of the hooks-are imparted to the jack through the medium of the link arms E. At the end of the half movement the tripping finger G is disengaged from the segment, the action of the two fingers being the same, and the jack is permitted to divide as a whole, the arm connected to the hook K continuing out the full length of the throw, while the bar D forming the jack proper reverses its movement and returns. It will be understood that the arms E are parts of the jack, and are locked to the jack bar D, as shown in the lower portion of Fig. 2, when the tripper finger G is in engagement with the projection F It will be understood that the free hook end of the tripping finger G, is always in engagement with its segment F and rides upon the projection F which lifts the tripping finger, there being as above stated, a separate finger for each of the segments.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is: 1. In a dobby mechanism adapted for leno weaving, the jack, the link arms pivotally connected thereto, means for normally pressing the links to the jack curved segments pivotally connected to the jack, and links pivotally connecting the segments to the link arms.

2. In a dobby mechanism adapted for leno weaving a jack, link arms pivotally connected thereto, segments pivotally connected to the jack, links pivotally connecting the segments and the link arms, means for locking the arm to curved segments having projections formed thereon and the jack during the first half of the jack movement, and a spring adapted to engage the link arms, as and for the purpose set forth.

3. A loom attachment of the kind described comprising a jack, pivoted arms carried thereby, segments carried by the jack and having angular projections, tripping fingers adapted to engage said projections through a portion of the travel of the segments, links connecting the segments and the arms, and a spring hearing at its ends on the arms, as and for the purpose specified.

4. In a (lobby mechanism adapted for leno weaving a jack, link arms pivoted thereto, hooks pivoted to the arms,

pivoted to the jack, a link connecting one segment to one arm adjacent the pivotal point of the arm to the jack, a link connecting the other segment to the remaining arm adjacent the pivotal point of the said arm and its hook member, tripping fingers adapted to engage the projections on the segments, and a spring adapted to engage the link arms, substantially as set forth.

JOHN B. BOLTON.

Witnesses:

WILLIAM F. HOWE, Ronmvr HUGHES.

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