US2637184A - Warp tension bar for knitting machines - Google Patents

Description

May 5, 1953 P. J. SCHOENSTER 2,637,134

WARP TENSION BAR FOR KNITTING MACHINES Filed Aug. 14, 1951 INVENTOR Pete; Jdkiioezzster @Mfiw ORNEY Patented May 5, 1 953 WARP TENSION BAR FOR KNITTING MACHINES 'Peter J. Schoenster, Teaneck,'N. J., assignor to Alfred Hofmann & 00., West New York, N. J.,

a corporation Application August 14, 1951, Serial No. 241,784

6 Claims. (01. 66-146) This invention relates to tension and guide bars for Warp knitting machines.

Warp tension bars have been proposed which are'designed for use in high speed warp knitting machines. Such bars include a the tension control element thereof, extended sheets of thin gauge metal, which form a resilient cantilever for supporting the guide bar. With continuous sheets or strips of metal extending the length of the machine, it is rather difiicult to insure precision control of the warp tension at all points along the length thereof.

Accordingly, an object of this invention is to provide improved warp tension means including resilient mounting means for the guide bar which may be precisely adjusted for desired yarn tensions at successive points along the length of the bar.

Another object of this invention is to provide improved warp tension means including spaced, individual resilient supports which mount the guide bar, each support being separately adjustable to vary the response thereof to tensile forces derived from yarns moving over the bar, whereby the quality of the knitted fabric may be controlled and selvage yarn tensions may be suitably adjusted.

The invention accordingly consists in the combination of elements and arrangement of parts as exemplified in the embodiment herein shown and described.

In the drawing; Fig. 1 is a top plan view of a warp tension bar embodying the invention; and

Fig. 2 is a side elevational view thereof.

Referring in detail to the drawing, Ill designates a warp tension bar assembly embodying the invention. The same comprises a conventional support bar ll mounted on a warp knitting machine and may be mounted in a manner to permit the same to be rocked or oscillated about its longitudinal axis. Extending at right angles to bar II, in spaced parallel relation, are a plurality of similar arm members l2 which may be of inverted channel cross section. Each member 12 is secured at the inner end thereof to support bar II by means of a screw 13. The flange portions H of arms [2 extend slightly beyond the web portion [5 at the outer end thereof, to provide aligned, apertured ears I6.

A second arm member ll, also of inverted channel cross section, is articulated to each arm l2. The arm member I! has its flange portions l8 slightly extended beyond the web portion I9, at the inner end thereof, to form aligned, apertured ears 2 0.

Each of the cars 20 is adapted'to register with an ear I6- and a transverse pivot pin 2| passing through the registering pairs of cars, provides a pivotal connection between each pair of arms 12, ll. Means is provided for resiliently supporting one arm of each pair of articulated arms, relative to the other arm. To this end, there is provided a flat, strip spring 22 which is mounted on the underside of the web portion 15 of each arm i2. The spring 22 may be mounted for longitudinal movement, for the purpose hereinafter described, by forming a pair of longitudinally aligned slots 23 in the web portion [5 of each arm 12 and passing screws 24 through the slots and openings in spring 22. Thus, the springs 22 may be retained in selected longitudina1 positions relative to arm I2.

The free end portion of spring 22 underlies the web portion 19 of arm ll, thereby resiliently supporting the arm ll relative to arm l2. An elongated, light, somewhat flexible yarn guide bar 25 interconnects the outer ends of arms ll, being suitably secured to projecting web portions I9a thereof.

Yarn indicated by the dotted line 11 is adapted to move from reels, not shown, over the support bar II and guide bar 25, to be directed to the knitting elements of the machine, not shown. It is apparent, that with any change in the yarn requirement of the knitting elements, at various portions of the knitting cycle, proper tension will be maintained through the resilient support of the guide bar 25. Thus, with an increased demand for yarn, the arms ll will be deflected downwardly as indicated by the dotted lines and with a decrease in demand for yarn y, the arms I! will be restored to their normal position by the biasing action of springs 22. Thus, varying tensions of the moving yarn may be transmitted through the guide bar to the springs.

While the support bar ll may be fixedly attached to the frame of the knitting machine, when bar II is mounted for rocking movement, the same may control the operation of braking means and reel drive mechanism, in a manner well known in the art and shown in Patent 2,521,218, assigned to the assignee of the instant application. In such case, if the yarn tension should exceed the capacity of the spring 22, support bar II will be rocked about the longitudinal axls thereof and thereby actuate reel control mechanism connected thereto.

The resilient capacity of individual springs 22 may be suitably varied by adjusting the longitudinal position of the springs and retaining the springs in adjusted position by mean of screws 24. Thus, the tension response along guide bar 25 may be varied to provide means for obtaining maximum quality control of the fabric bein knitted or to provide differential yarn tensions at the selvage ends of the machine.

As various possible embodiments might be made of the above described invention, and as various changes might be mad in the embodiment set forth, it is understood that all matter herein set forth or shown in the drawing, is to be interpreted as illustrative and not in a'limiting sense.

Having thus described my invention, I claim as new and desire to protect by Letters Patent:

1. In a warp knitting machine, a support, a warp guide bar and means for mounting said guide bar on said support comprising a pair of interpivoted arms, one of said arms "being connected to said bar and resilient means extending between said arms 'for .resiliently -supportingsaid arms relative to each other.

2. In a warp knittingmachine, a-supporaaplurality of spaced parallel arms extending from saidsupport, an-arm pivoted to eachofsaid-first mentioned arms, a warp guide bar interconnecting said second mentioned arms, and a strip spring -member extending between each pair or pivoted arms for resiliently supporting said arms relative to each other.

3. In a knitting machine as in claim 2, wherein saidspring member is longitudinallymovable relative to said pivoted pair of arms and means for retaining said spring member in adjusted longitudinal'positions thereof.

4. In a warp knitting machine, an elongated support, a plurality of spaced parallel arms extending from said support, an arm articulated to each of said first mentioned arms, a warp guide bar interconnecting said second mentioned arms, and a strip spring member fixed to one of each pair of articulated 'arms and having a portion engaging the other .of each pair oi articulated arms to resiliently support said articulated arms relative to each other.

5. In a warp knitting machine as in claim 4,

wherein said support may be rocked about the longitudinal axis thereof.

6. In a warp knitting machine, a support, warp tension means including a warp guide bar andmeans :for mounting said guide bar on said support comprising a, plurality of independent, spaced resilient means interconnecting said bar and "said support at spaced intervals along said bar, and means on each of said resilient means for adjusting the resilient capacity thereof.

PETER J. SCI-IOEI'ISTER.

References Cited in "the file of this patent UNITED STATES PATENTS

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