US1652592A - Lock for harness jacks of knowles looms - Google Patents

Description

Dec.-13, 1927.

W. H. WAKEFIELD LOCK PORHARNBSS JACKS OF KNOWLES LOOIS Filed 001;- 26, 1925 Patented Dec. 13, 1927. UNITED STATES PATENT OFFICE.

WALTER H. WAKEFIELD, OF \VORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

LOOK FOR HARNESS JACKS F KNOWLES LOOMS.

Application filed October 26, 1925. Serial No. 64,795.

'This invention relates to harness mecha nism for looms and more particularly of the well-known Knowles type and it is the general object of the invention to provide means for positively locking the harness jack so that the actuating elements therefor will not be accidentally disturbed by the pressure of the warp on the harness frames.

In the well-known Knowles head there is usually provided a series of vibrator levers on each of which is rotatably mounted a vibrator gear receiving rotary motion from one of two oppositely rotating cylinder gears. The so-called vibrator connectors extend between the vibrator gears and the harness levers or jacks and serve to control the position of the jacks when the vibrator gears are rotated. In order to hold the jacks in their extreme positions the vibrator gears as heretofore made have been given a-rotar motion somewhat more than half a turn, the excess over 180 being required to move the pivotal connection between the connector and the vibrator gear beyond the line joining the center of the gear and the connection with the harness jack. So-called drop weights have been employed heretofore to assist the vibrator connectors in moving to the locking position but they are spring pressed and not positive in their action.

In order to provide for positively locking the jacks so that the vibrator gears need not receive so large an angular motion I contemplate the use of a locking bar to enter notches formed in the harness jacks to hold the same against accidental displacement during the time that the shuttle is in flight. In this way it will be unnecessary to use the aforesaid drop weights and the vibrator gears can be made with a somewhat greater clearance than has been heretofore possible due to the fact that they need not receive as much motion as was formerly necessary.

With this and other objects is view which will appear as the description proceeds my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

g In the accompanying drawings wherein I have shown a convenient embodiment of my invention,

Fig. 1 is a vertical longitudinal section through a Knowles head having my invention applied thereto and showing the same about to start on a harness changing movement with the jacks unlocked,

Fig. 2 is a view similar to Fig. 1 but showing the head after the harness changing movement has been completed with the jacks locked,

Fig. 3 is a horizontal section on line 3-3 of Fig. 1 r

Fig. 1 shows a portion of Fig. 3 on an enlarged scale showing the notches in the harness jacks Fig. 5 is an enlarged section in detail showing the usual lock knife together with my improved locking bar and the operating cams therefor, and

Fig. 6 is a detail sectional elevation similar to a part of Fig. 5 but showing a modified form of actuating arm to move the looking bar positively in both directions.

Referring to the drawings it will be seen that I have provided a loom frame 10 to which is secured in any approved manner a head frame 11 in which are journaled for rotation upper and lower mutilated oppositely rotating cylinder gears 12 and 13, respectively, driven in any approved manner by mechanism not shown. Outwardly extending arms 14 support a heel pin 15 which receives the outer ends of a series of vibrator levers 16.

' Each of said levers 16 has mounted for rotation thereon a vibrator gear 17 which is attached as at 18 to a connector 19 extending inwardly and having operative connection as at 20 with a harness jack 21. It is to be understood that the head is filled with a number of the units just described and that all of the vibrator levers are controlled as to their vertical position bya pat-tern chain 22 which receives a movement for each pick of the loom.

Each vibrator gear is provided with a relatively narrow space 23 and a relatively wide space 24, the wide space affording clearance to permit repeated rotation of a cylinder without a corresponding motion on the part of the vibrator gear when the latter is adjacent the cylinder. When the gear is to be rotated it is moved so that the narrow space will be presented to one of the cylinders. As the latter continues to rotate the connection 18 between the connector and the gear will be moved froni'one side of the axis of the'gear to the other relation of the f ll A lock knife is mounted on a pair of arms26 secured to a shaft 27 having a cam arm 28, (see Fig. 5) rigid therewith. The rear end of shaft 29 to which the lower cylinder 13 is secured has fastened thereto a cam 30 to cooperate with the arm 28. As said shaft- 29 rotates the lock knife 25 is periodically moved into and out of operative contact with the adjacent end of the vibrator levers 16 to hold them against accidental vertical movement.

In order to dispense with the drop. weights previously mentioned and also to require less angular motion on the part of the vibrator gears I provide each jack 2i with an arcuate segment 40 the outer surface of which is concentric with pin 41 about which the aclis move. ach of said segments 40 is provided with a pair of notches 42 and 43, respectively. V v

- A. shaft44 extends through and is rotatably supported by the head and. has a pair of arms'45 se'curedthereto which support a locking bar 46 adapted to enter the notches 42 or 43. Each end of the shaft 44 has secured thereto an arm 47 having a roll 48 rotatably. mounted thereon to'engage a cam 49, securedto shaft 29. Said cams 49 are provided with alow dwell portion 50 and a high dwell. portion .51, these dwells being connected. by cam faces which raise or lower roll 48 to give corresponding movements to the locking bar 46.

As shown in Fig. 1. the cylinders 12 and 13 are about to move the vibrator gears and it is therefore necessary to have. the bar 46 in unlocked position so the jacks will be free to move. In' this position it will be necessary for the usual-lock knife to hold the vibrator levers to insure proper engagement of the cylinders and gears. In Fig. 2 the parts are shown as they appear at the end of. a jack shifting stroke, the usual lock knife being moved to unlocking position so that the pattern mechanism can give the vibrator levers a new setting. At this time the shuttle is in flight and the harnesses should therefore be locked and it will be seen in said Fig. 2

that rolls4i3 are onthe low part. of cams 49 so that spring 52 interposed between arm 28 and one of the arms 4Tcau move bar 4o into the notches and lock the jacks. The jacks will l/I'K-TCfOI'O be looked as soon as they reach their extreme position independently of the relation of the connection .18 with respect to the connection 20 and the. center of the vibrator gear.

iByreferring to the drawings it. will be seen. that the notches-in the segments 40 occupy three positions but there will always be a notch underthe bar 46, the notches 42 being operatiyely placed with respect to the bar when the corresponding jacks have been moved to the right and the notches 43 being placed underthe locking bar when the corresponding jacks have been moved to the left. Because of slight variations in the adjustments of the looms found to prevail in different mills I have made the cams 30 and 49 independent of each other so that slight relative adjustments may be made.

By referring to Fig. 6 it will be seen that I have provided a substitute for the cams 49 in the form of track cams having a groove 61 to receive the rolls 48. 'With this form of cam the looking as well as the unlocking of the harness jacks is accomplished positively and the spring 52 is unnecessary.

From the foregoing it. will be seen that I have-provided means for locking the harness jacks independently of the, relation of connection 18. with respect tothe line joining the connection 20 and the axis of the vibrator gear and that it is unnecessary to use the usual drop weights. It will further be seen that the jacks are formed with segmental sections having a number of notches one of which will always be in operative position with respect to the locking bar.

Having thus described my invention 7 it will be apparent that changes andmodifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details disclosed herein out what I claim is:

1. In a harness mechanism for a loom having a pattern controlled lever, a rotatable gear mounted thereon, rotary actuators for the gear and a harness lever connector attached to the gear, a rotary cam movable with one 'of the actuators, a locking bar operatively connected'to the cam, a harness lever attached to the connector, a segment formed on the harness lever, and means to move the bar into locking position with respectto the segment as the cam rotates.

2. In a harness mechanism for a loom having a pattern surface, a vibrator lever to be controlled by the pattern surface, a lock for said lover, a harness lever, a lock for said harness lever, means connecting the levers together, mechanism acting on the means to move the harness lever when the vibrator lever changes position under influence of the pattern surface, and a device to operate both locks in timed relation to lock one of said lovers while the other is moving. I

3; V In a harness mechanism for a loom having a pattern surface, a vibrator lever for the surface, a harness lever operatively connected to the vibrator lever, and locking means for said levers effective to lock one of said levers at a time, whereby either lever is free toanove while theother lever is locked.

In testimony whereof I have hereunto at fixed my signature. 7

IVALTER H. WAKEFIELD.

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