US1689704A - Thread cutter for weft-replenishing looms - Google Patents

Description

Get. 30, 1928. Y 1,689,704

w. H. WAKEFIELD THREAD CUTTER FOR WEFT REPLENISHING LQOIIS Filed D60. 2'7, 1926 Z 4.; INVENTOFE J7 a) WALTER H WAKEFIELD L XTTOHNZYS Patented Oct. 30, 1928.

* UNIT-ED STATES i 1,689,704 PATENTOFFICE.

WALTER H. WAKEFIELD, OF WORCESTER, MAssAoHusETTs, ASSIGNOR To CROMPTON' & RNoWnEs LOOM WORKS, E WORCEsTER, MAS ACHUSETTS, A CORPORATION OF MASSACHUSETTS.

THREAD CUTTER FOR WEFT-REPLEN ISHING LO0MS..

Application filed December 27, 1926. Serial No.'157,091.

is both open and closed positively without the use of springs and without contact'with the lay toopen the cutter.

Most weft replenishing mechanisms are provided .with a shuttle feeler the purpose of which is to arrest transfer when a shuttle is so widely misplaced asnot to be able to receive the incoming bobbin properly, It has been proposed heretofore to mount the thread cutter on the shuttlefeelers'but in many in stances wherethis is done it is found that the cutter is opened before. the shuttle arrives in position to be actuated by the feeler andif the feeler shouldv be raised by a misplaced shuttle the cutter operates, even though a transfer does not take place. This is particularly true where the shuttleis only slightly n'iisplaced'and the cutter as a result lies behind thefront wall of the shuttle in position to receive the weft, As the transfer is revoked the same bobbin will be active on the next pick and inasmuch as the thread has been out the loom will be stopped by the filling fork. It is an important object of my present invention to provide a thread cutter which shall be controlled by the transferrer .mechanism butnotdependent in any way for its cutting stroke upon said mechanisnnto the end that when a shuttle is misplaced on the transferring beat of the loom the cutter will not close while in cuttingposition.

I-n copending application Serial #154,808 filed by I-Iook there is shown a cutterwhereinthe first part of the downward movement of the transferrer. arm releases a spring: to

operate the cutter. In my'present invention I employ the transferrer, arm to release the cutter but the actual closing ,does not occur until the lay nears front center, thus giving the cutter more time to receive the thread to be cut. If transferis revoked the cutter will. close as the shuttle feeler is raisedbut the closing will be at a slow rate and the thread will have time to fall out of the space between the cutter blades as they move upwardly feeler. 7

It is a further object of the invention to provide a cutter on the shuttleufeeler closed about the axis of the shuttle by the lay but having the lay engaging part of the cutter offset from the shuttle engag ing part of the feeler so that a slightly misplaced shuttle will raise the feeler but will not engage theoifset of the cutter, thus permittingthe cutter to rise without cutting.

With these and other objects which will a1 pear asthe description. proceeds,-1ny invenion relates to the arrangements and combinations of parts hereinafter set forth, and more particularly pointed out in the claims.

In the accompanying drawings, wherein a convenient embodiment'of my invention is shown, i

Fig. 1 is an elevation of a portion of a nnilti-colorlweft replenishing mechanism as viewed'from the interior of the loom and having my invention applied thereto,

Figs. 2, 3 and {l are detail operating views similar to a portionofFig. 1 and showing the mechanism in different positions. and t Fig. 5 is a horizontal section on line 55 of Fig. 3 but with the shuttle and lay advanced to a'position under the cutter and r with the shuttle slightly misplaced so as to {evoke the transfer Without operating the out .er.

- Rcferiing'to the drawings I have shown a loom frame 10 on WhlCh lS mounted the stand 11'=of a weft replenishing mechanism indicated generally at 12.. A stud 13 mounted on the stand 11 affords pivotal support for a transferrer arm 14 having a portion 15 which movesin an arcuate slot 16. Vertical slides 17' may be employed. to control the release of thebobbins and a shuttle feeler holder 18 is pivoted as at 19 to the magazine. .A rod 20connected as at 21 to the feeler holder. ex-

tends upwardly to the top shaft of'the replenishing'mechanis'm 12 and acts to depress the holder-18 just prior totransfer. A'Shllttle feeler 22 is secured in the holder by means of a screw or bolt 23 and has a forwardly and downwardly inclined edge 24epositioned to be substantially the'same as that set forth in Patent No.1,03'0,74;8 to Ryon and the shuttle feeler supported on the holder 18. may be the same as that shown in Patent No.

1,022,108 to Ryon. It is 'suflicient for the present purposes to state that when a transfer is about to take place the shuttle feeler 22 will be moved downwardly from the position shown in Fig. 1 tothat shown in Fig. 2 and that the transferrer arm-14 will descend by connections not shown but well understood to insert a new bobbin in the shuttle. If the shuttle should be improperly placed, however,the shuttle feeler 22 will be raised and by means of mechanism not shown but set forth in the aforesaid patents to Ryon,

the transferrer arm will be prevented from descending and will remain in the position shown in Fig. 1.

My invention relates more particularly to -a cutter to be mounted on the shuttle feeler and while I do not wish to be limited to any particular form of cutter yet for the pur-.

posesof illustration I have shown a thread cutting device somewhat similar to that shown in co-pending application No. 127,695 filed by Chevrette. Accordingly, in carrying out my invention I provide the bottom of the shuttle feeler with a cutting edge 40 stationary with respect to the feeler 22 and pivot a movable cutter blade 41 on said feeler as at 42. A thread clamp 43 is secured to the shuttle feeler as at 44 and presses the the lay L. V

movable blade 41 against the fixed blade 40 and cooperates with the movable blade to clamp the filling extending between the selvage of the cloth and the cutter 41.

The movable blade has an arm 45 having a pin 46 which enters slot 47 in the lower end of an upwardly extending connector 48.

Said connector is attached as at 49 to a small blade 41 and extending inwardly toward the selvage, said arm having a rounded end 57 to cooperate with the shuttle box back 25 of 7 Under normal conditions the parts are in the position shown in Fig.1'and when a transfer is about to take place the shuttle feeler will be moved downwardly by rod 20 to the position shown in Fig. 2. Inasmuch as the transferrer arm is up at this time, stop 55 will be inengagement with arm 54 and as pin 46 moves down with the feeler it will engage the bottom of slot 47 andbe held against further downward movement, thus opening the cutter as shown in Fig. 2. If the shuttle be properly placed the transferrer 'arm'14will descend and the stop 55 will move away from the arm '54s o that the cutter is free to move about'stud 42in a clockmovement while the lay L is still a short distance from front center. As the lay continues to move toits extreme forward position the transferrer arm 14 will continue downwardly and the'back of the boxwill engage the inclined surface 24 of the shut-- tle feeler 22 to lift the same and restore itto the normal position shown in Fig. 1.

During this restoration pin 46 will move upwardly in slot 47 and upon reaching the top of said slot will raise arm 52 against fixed stop 53, stop 58 on the shuttle feeler holding the movable cutter to'cause pin-46 to rock lever 50. At a. slightly later time inthe pick the transfer-rel arm 14 will move upwardly to the position shown in Figs. 1 and 2 andthe pin or stop 55 will engage the arm 54 to hold the parts inlth'e'position shown in'Fig. 1.

Should the shuttle be improperly boxed, as indicated in Fig. 5, with the nose N thereof located'nearer the selvage than usual the inclined surface 24 will be raised before the transferrer arm 14 has time to start its down.- ward movement and the arm 56, being ofiset from the shuttle feeler, will be out of positionwith respect to the shuttle and will not I be moved angularly relatively to the shuttle feeler as the latter starts to move upwardly. The cutter blade 41 will therefore remain in the open position shown in Fig. 2 until the pin 46 reaches the top of the slot 47 at which time the jaw 41 will be inclined at such an angle that the filling F will fall from bet-ween the cutters before the blade 41 is reset to the normal position shown in Fig. 1.[ At the time of closing of the cutter under the conditions just described the same'will be above the shuttle so that the'tension of the filling will tend to move the same downwardly out of thenotch defined between the cutters. Y J

From the foregoing it will be seen that I have provided a thread cutter for a weft replenishi'ng loom wherein'the opening of the cutter depends upon the position of the transferrer arm and wherein the cutter is opened at the time the shuttle feeler 22 moves downwardly. It will further be seen that even though the shuttle feeler may engage an improperly placed shuttle the cutter will be closed not on. the first part of the revoking movement of the shuttle feeler as is customary, but as the revoking movement. is being completed, so that the filling extending from the selvage to the bobbin in the shuttle will be left intact and not cut as is the case with most cutters mounted on s'huttlefeelers.

The thread falls out of the, notch between the two cutters largely because of the location of the center 19, the notch between said cuttransferrer arm, a lay, a shuttle feeler to be moved to shuttle feeling position prior to the movement of the transferrer arm, a thread cutting mechanism mounted on the shuttle feeler, means including a connection with the transferrer arm to open the cutter as the shuttle feeler moves to shuttle feeling position and the transferrer arm is raised, and

means operated by the lay to close the cutter positively While the shuttle feeler is in feeling position andthe transferrer arm has started a transferring movement to break said connection.

2. In a filling thread cutter for a loom hav-' ing a lay, a transferrer'arm normally raised and in inoperative position, a shuttle feeler normally raised and movable toward shuttle feeling position prior to transfer, a cutter mounted on the shuttle feeler and normally closed, means including a connection with the transferrer arm when the latter is raised to open the cutter when the shuttle feeler moves to feeling position, and meansto be engaged by the lay to close the cutter when the shuttle feeler is in feeling position and the transferrer arm has started on a transfer movement to break said connection.

3. In a thread cutter for a loom having a lay, a transferrer arm normally inoperative,

a shuttle feeler normally inoperative but movable to shuttle feeling position prior to the time of transfer, a thread cutter on the shuttle feeler normally closed, connections for the cutter established when the transferrer is inoperative to open said cutter when the shuttle feeler moves to shuttle feeling position, said connections preventing the closing of the cutter while the shuttle feeler'is.

in shuttle feeling position if the transferrer arm remains inoperative, and means engage able by the lay to close the cutter when the shuttle feeler is in feeling position and the transferrer arm has moved from inoperative position to disestablish said connections.

4. In filling thread cutting mechanism for a loom having a lay, transfer mechanism, shuttle feeling mechanism to prevent operation of the transfer mechanism when a shuttle is slightly misplaced, cutter mechanism mounted on the shuttle feeler normally closed and open when the shuttle feeler moves to shuttle feeling position, and means operatively connected to the cutter and offset from the shuttle feeler in the direction of the length of the shuttle to be out of the range of a slightly misplaced shuttle, said means closing the cutter by engagement with the lay when the shuttle feeler is not engaged by a misplaced shuttle, and said means moving with the shuttle feeler without relative movement with respect'thereto and out of engagement with the lay and misplaced shuttle so that the cutter remains open while the shuttle feeler starts away from shuttle feeling position when the shuttle feeler is moved by a misplaced shuttle.

In testimony whereof I have hereunto affixed my signature.

WALTER H. WAKEFIELD.

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