US1563305A - Picker motion for looms - Google Patents

Description

Nov. 2 4, 1925.

G. B. AMBLER PICKER MOTON FOR LOOMS Filed Nov. l. 1922 IW/vena?? tiem patented Nov. 241, T25. Y

STATES GEORGE B. AMBLER, OF LEOMIN STER, MASSACHUSETTS, ASSIGNOR T0 F. A. WHITNEY CARRIAGE COMPANY, 0F LEOMINSTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

PICKER MOTION FOR LOOMS.

Application filed November 1, 1922. Serial No. 598,287.

To all whom t may concern.'

Be it known that I, GEORGE B. AMBLER, a citizen of the United States, and a resident of Leominster, county of Worcester, and State of Massachusetts, have invented an Improvement in Picker Motions for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to looms and more particularly to the picking mechanism thereof, the purpose being to provide a picking device having a wide range of movef ment while keeping the other parts of the loom in a compact and accessible organization. The invention finds a particular application to the so-called needle looms commonly used for weaving relatively sti materials, such as wicker ware formed from real or imitation reed and in which a long rod or needle is protracted through the shed and in one phase of its movement draws the filling therethrough.

My invention will be best understood byy reference to the following description of an illustrative embodiment of my l:invention utilized in such a type of loom and shown by way of example in the accompanying drawings, wherein:

Fig. 1 is a front elevation of so much of a loom as is necessary to an understanding of my present invention, the parts being in one phase of the picking movement; and

Fig. 2 is a similar view partly broken away showing the parts in opposite phase.

Referring to the drawings, I have there shown a loom of the type having a needle 5 running on a guideway 7 projecting from the side of the loom and adapted to be thrust linwardly through the shed in the manner shown in Fig. 2. The loom shown is of the single needle type. The width of the fabric woven by this loom is obviously limited by the range of movement of the needle or needles. It has been common to operate such a needle by a rocker link having its upper end connected thereto and operated by connection to one of the usual power driven shafts organized at the lower part of the loom. rThe angular stroke of such a rocker link is limited by practical considerations and obviously the length of the arc of movement of the upper end of the weaving operation takes place at a relatively low elevation such as is convenient and customary in looms.

In carrying out my invention I may utilize as elements of the combination suitable mechanisms similar to those hitherto used. Referring to the drawings, I have there shown a driven wheel 9 located at the under side of the loom having a wrist pin 11 which works in an arc-shaped slot in a rocker arm 13. When the wrist pin 11 Iis travelling through the right hand portionof its path as shown in Fig. 1 the rocker arm 13 will be stationary, the slot therein being concentric with the path of the pin. As the pin passes into the other half of Iits circular patch (see Fig. 2) the rocker arm 13 will b e reciprocated with a retardation at the reversal of movement. Such a motion is particularly adaptable for the protracting and retracting movement of the needle 5. The rocker arm 13 may be joined by means of a connecting rod 15 to a primary or driving rocker link 17 supported, in the example illustrated at its extreme lower end, by a radi'us link 19 and the rocker link 17 will obviously be oscillated with a motion corresponding to that of the arm 13. Referring to Figs. l and 2 which show the link 17 at its extremes of movement, it will be seen that if the needle 5 were driven by this link the range of motion would be relatively limited and this limitation is the greater the lower is the position of the needle 5. It is impractical or inconvenient, however, to place the mechanism at a great elevation.

In accordance with my invention I utilize for driving the needle 7 a .rocker link depending from above, the length of which is not limited by the position of the needle 5 and the slide 7 at a convenient elevation. A suitable frame-work 21 may be built to any desired elevation and to this is pivoted a secondary or driven rocker link 23 which may swing in and be guided by a suitable slot in a frame member 25 extending parallel to the slide 7. The elevation of the pivot point of the link 23 above the plane of weave where the needle operates may be substantially greater than the efective elevation of that plane, that is, the distance of that plane above a point, below the same where it would be reasonably possible to support driving devices. The linear stroke of the end of the link obviously is increased directly in proportion to its increased length as compared with an upstanding drivlng link such as has been previously referred to. The end of this link 23 swings close to the plane of the slide 7 and consequently a maximum movement of the slide through the link is provided and this may be effected while compensating for the fact that the end of the link 23 moves in a circular arc while the movement of the needle 5 is rectili'pear by coupling the parts through a link 2 The driven link 23 may be oscillated by the driving link 17 and for this purpose I have shown the latter provided with an offset end extending past the plane of weave and being connected above the same to the link 23 at an intermediate point of the latter. In the example shown the link 23 is operated as a lever of the third class and the point 33 where power is applied is re lmote from its fulcrum so that the driving link 17 acts with good mechanical advan-,

tage. rlhe relative arrangment of the links also provides a compact organization, the region in which the linkage operates being reasonably restricted and the links in their movement do not interfere with other parts of the loom. The offset 29 shown provides in the construction illustrated for carrying the end of the link 17 from the plane of the rocker arm 13 which is close to the slide 7 to a point in the rear of the latter to be connected to the rear of the link 23. I have shown the two links 17 and 23 as provided with suitable shoes 31 which fll any clearance between them and provide a restricted bearing for the pivotal connection of the two links by the pivot pin 33 which preferably takes into suitable slots as indicated to provide a certain looseness in the ivotal connection to prevent any possible inding. The link 17 in the example shown extends past the pivot point and is received in and guided by a suitable slot in the frame member 25. It will be clear that the shoe 31 at .the upper end of the driving link 17 because of the relatively great length of such link will have a long stroke for a given angular movement effected by the rocker arm 13 and the end of the driven link 23 will move through a correspondingly greater linear distance. At the same time the angle of movement will be maintained at a small value and the lower end of link 23 will move in a relatively shallow arc approximating t-he straight line of guide 7 and exert an effectively applied push or pull on the needle 5 to reciprocate the same.

In one view of the construction illustrated the links 17 and 23 pivoted together at 33 constitute a toggle which is thrown to opposite sides of dead center and one arm of which is extended past the pivot for connection to the needle 5. Herein the mounting of the driving link 17 on the radius link 19 permits the reverse breaking of the toggle while the driven link 23 Swings from a fixed pivot and may be guided as shown at an intermediate point by the frame member 25. In the example shown the lower arm of the toggle consisting of the link 17 is considerably longer than the upper arm consisting of that part of the link 23 between its pivot and the point 33. By this arrangment the angular stroke of the driving link 17 is minimized.

By such a construction as is exemplified by that just described a long movement may be given to the needle 5 while keeping the position thereof and consequently the cooperating parts of the loom at a relatively low elevation. W'hen this is effected as herein by a depending driving link the connection may be made asshown by suitable cooperating mechanism organized on the other or lower side of the slide and at the loom side which permits power to be taken from the usual driving shafts underneath the loom and without encumbering the upper portion thereof. As appears from Fig. 2 the needle in its inner position is unsupported by the slide 7 except at one end. Because of the wide range of movement permitted by the pickin motion herein described the long needle might droop and fail to align with the means presentingthe filling thereto or taking it therefrom as the case may be. Preferably, therefore, I arrange some or all, herein some, of the beat up dents 35 of the loom in the form of open throated hooks through which the needle passes in their retracted position in such manner that they underride-and Support the same and maintain it in a fixed line of movement. Such a construction is more fully illustrated and claimed in my copending application Serial No. 574,029, filed Jul 10, 1922.

Having thus descri ed in detail one embodiment of my invention, what I claim as new therein and desire to secure by Letters Patent I shall express in the following claims:

1. A loom having a needle adapted to be projected and retracted through the shed to lay the filling and means for driving the samecomprising an upstanding rocking lever pivotally mounted below and extending past the horizontal plane .of the needle,

means for oscillating said link, a depending lever swinging about a center at a distance above said plane greater than the distance of said plane above the pivot of the lever, Said lever being connectedto a point between the ends of the link and the free end of said link being connected to the needle, the whole constituting a needle-operating linkage operating substantially in a single plane.

2. A loom having a needle adapted to be projected and retracted through the shed to lay the filling and means for driving the same comprising an npstanding rocking lever pivotally mounted below and extending past the horizontal plane ol the needle., means for oscillating said link, a depending lever swinging about a center at a distance above said plane greater than the distance of said plane above the pivot of the lever, said lever being connected to a point between the ends oi' the link and the tree end of said link being connected to the needle, one of said links being mounted to permit endwise movement thereof during its oscillation, the whole constituting a needle-operating linkage operating substantially in a single plane.

3. A loom having a needle adapted to be i projected and retracted through the shed to lay the filling and means for driving the same comprising a depending link pivoted above the plane of weave, an upstanding link pivoted thereto at a point abo-ve the plane of weave,the two constitutinga toggle operating in a substantially vertical plane, the depending link being extended to a point adjacent the plane of weave and connected to the needle and means connected to the upstanding link to throw said toggle to opposite sides of dead center, the arm of the toggle formed by the upstanding link being longer than the arm formed by the depending link whereb a relatively small angular movement of tiie latter is eiective to traverse the needle. 4

4. A loom having a needle adapted to be projected and retracted through the shed to lay the filling and means for driving the same comprising a depending link pivoted above the plane of weave, an upstanding link pivoted thereto at a point above the plane of weave, the two constituting a toggle operating in a substantially vertical plane, the depending link being extended to a. point adjacent the plane of weave and connected to the needle andy means connected to the upstanding link to throw said toggle to opposite sides of deadv center, the arm ot` the toggle formed by the upstanding link being longer than the arm formed by the depending link whereby a relatively small angular movement of the latter is effective to traverse the needle and the ef- Jfective length of the depending link being greater than the elevation of the plane of weave.

In testimony whereof, I have signed my name to this specification.

GEORGE B. AMBLER.

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