US3456309A - Stretching springs for balancing the pull from fringe to fringe - Google Patents

Description

July 22, 1969 POZZQLQ 3,456,309

STRETCHING SPRINGS FOR BALANCING THE PULL FROM FRINGE TO FRINGE Filed June 23, 1967 5 Sheets-Sheet l Fig.2a FigQ'Zb l '1 1O e.

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F==Q w r4 bfi r-'1f 3 g 9 f 1- ufig Z "1/ INVENTOR. MW A BY W W United States Patent US. Cl. 2818 5 Claims ABSTRACT OF THE DISCLOSURE A stretching spring construction for use in fringe twisting machines, having a rectangular or ellipsoidal section, thereby permitting greatly increased length, the springs being mounted against rotation and in two parallel rows, the springs of each row mounted in offset relation to the springs of the other row.

This invention relates generally to fringe twisting machines, and relates more particularly to the provision of new and improved stretching springs in such fringe twisting machines for balancing the pull from fringe to fringe and preventing subdivision irregularities in the thread field produced by the comb.

Heretofore, in order to satisfy the requirements for the balance of the pull from fringe to fringe and prevent subdivision irregularities, fringe twisting machines have made use of springs obtained with round section music steel wire, an end of which rests on the spring carrier beam and the other, suitably bent for forming a catching hook for the fringe threads, enters the warp threads. In such prior uses, the spring is bound by a round bar jointed to the beam and passing through the rings at the base of the spring. The spring is moreover guided by suitable slot guides which limit the spring stroke and the inflation rise.

These prior springs present many particularly serious disadvantages as, for example, the low capacity of balancing the pulls, the low value of the highest absorbable pull, the remarkable value of the ratio between the diameter of the thread and the spring pitch, the inadequacy of the bond for preventing an excessive rotation of the spring as to a vertical axis and the difficulty of extracting the fringe from the spring at the end of the working of the fringe.

It is therefore an object of the present invention to provide a new and improved stretching spring for a fringe twisting machine which eliminates or largely overcomes the aforementioned disadvantages of the prior art.

Another object of the present invention is to provide a new and improved stretching spring for a fringe twisting machine which has increased durability.

Another object of the present invention is to provide a new and improved stretching spring for a fringe twisting machine which permits fringes to be produced which are of a shorter length than is possible with presently available fringing machines.

Objects and advantages of the invention are set forth in part herein and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention.

Of the drawings:

FIGURE 1 shows a side view of a prior art spring;

3,456,309 Patented July 22, 1969 p CC FIGURE 2 shows a side view of a preferred unrestrictive embodiment of a spring according to the invention;

FIGURES 2a and 2b show two sections of the spring according to the invention;

FIGURE 3 shows the irregular pre-subdivision of the thread field, said pre-subdivision being produced by a rotation of the springs around a vertical axis;

FIGURE 4 shows the regular subdivision of the thread field stretched by two staggered rows of springs according to the invention; and

FIGURE 5 shows the subdivision of the thread field stretched by two opposite rows of springs.

Referring now more particularly to the accompanying drawings, there is illustrated in FIGURE 1 a prior art stretching spring arrangement, wherein 1 indicates the stretching spring, 2 the bond round bar supported by ear 3 jointed to beam 4. 5 indicates the spring foot resting on beam 4. 6 indicates hook bent spring part, which grips the fabric for the stretching of the fringes. 7 indicates the slotted plate, a slot being provided for each spring, which guides the springs during their inflection and which is secured to beam 4 by means of screws 12. 8 indicates the thread field to be fringed on fabric 9. 10 indicates the two rubber-carrier beams performing the rolling operation of the fringes.

It has been found that the above mentioned disadvantageous in prior art fringe twisting machines are essentially due to the round section of spring 1, to the small length of the spring rod due to the low inertial moment as to the load to be supported, to the remarkable inflection angle of spring 1 as to the limited rise, resulting in part 6 of the hook, bending noticeably with respect to the remainder of the spring, and to the kind of bond which allows a large rotation of the spring with respect to its vertical axis.

In FIGURE 2, 1' indicates the stretching spring according to the invention characterized in that it presents a rectangular or ellipsoidal section as shown in FIGURES 2a and 2b, of which the long side and respectively the long axis is parallel to the threads to be fringed and to the inflection plane of the spring. 2' indicates the bond plate secured to beam 4 by means of screws 3'.

5' indicates the spring foot inserted in a hole made in the beam, one for each spring, suitable to prevent the rotation of the spring around an axis parallel to its rod. The extraction of the fringes from hook bent ends 6 is made easier through the concurrence of two circumstances, the first one given by hinging in 13 slotted blade 7', which, besides guiding the spring during the inflection, serves also to extract the fringes rolled by the springs themselves, and the second resulting from the fact that part 6' is only slightly bent as to the vertical line.

The use of a music steel wire with a rectangular or ellipsoidal section allows the construction of a spring which, even supporting high loads, presents a remarkable rod length, capable of three or more times the length of the prior art springs, and therefore a high rise even at low stresses of the material. Since the inflection rise of the spring is much higher than the highest length difference from fringe to fringe, there results a significantly improved ratio between the length difference of the single fringes and the highest inflection rise, and therefore an improved means regularisation or balance of the pull from fringe to fringe. Since the lowest requested pull, also with lighter fabrics, is ditferent from zero, the spring is mounted pre-loaded in order to reduce the apparent rise and thereby allow the rolling of shorter fringes under the same pull baancing degree.

In addition, the provision of means for preventing rotation of the springs around a vertical axis, embodied in the spring foot bond and guide 7', and possibly the small hook angle, eliminate the irregular pre-subdivision of the 3 thread field produced by prior stretching springs, as illustrated in FIGURE 3.

Every pull and every practical moment is now absorbed by increasing only the long side and respectively the long axis of the section of the stretching springs of the invention. This permits considerable reduction in the side encumbrance of the springs and, by additionally staggering the two rows of springs supported by the beams, leaves the stretched thread field practically undisturbed in the middle point where the precise subdivision performed by the comb occurs (FIGURE 4).

Because of the remarkable length of the spring rod, the spring may, in a position of rest, be bent with respect to the vertical towards the rubber carrier beams without a noticeable increase of the hook angle and a consequent noticeable lowering of the fringe hooking point during the inflection, which occurs with the stretching springs of the prior art. A further advantage of the increased length of the spring rod is that it permits a considerable reduction in the distances between the points of the two spring series so that garments having short fringes, such as, e.g., shawls, may be produced.

Finally, the possibility of realizing high intertial moments permits lower stresses in the spring material, thereby preventing fatigue failure to the extent that the duration of the springs becomes practically unlimited.

The invention in its broader aspects is not limited to the specific embodiment herein shown and described but departures may be made therefrom, without departing from the principles of the invention and without sacrificing its chief advantages.

What I claim is:

1. In a fringe twisting machine having stretching springs for balancing the pull from fringe to fringe and preventing subdivision irregularities in the thread field produced by the comb of the machine, the improvement therein which comprises: each of said stretching springs having a generally rectangular cross-section, said springs being mounted in said machine so that their longitudinal sectional axes are generally parallel to the threads to be fringed.

2. A fringe twisting machine as claimed in claim 1, including means for preventing rotation of said stretching springs about their generally vertical axes.

3. A fringe twisting machine as claimed in claim 2, wherein said means for preventing rotation of said stretching springs about their generally vertical axes comprises means mortising said springs to said machine at their lower ends and guide means through which the free upper ends of said springs extend.

4. A fringe twisting machine as claimed in claim 3, wherein said guide means is mounted on said machine for pivotal movement in a vertical plane.

5. A fringe twisting machine as claimed in claim 1, wherein said stretching springs are mounted in two spaced parallel rows, the springs in said rows being mounted at equal longitudinally spaced distances from each other.

References Cited UNITED STATES PATENTS 3,195,216 7/1965 Polakofl? 28-18 LOUIS K. RIMRODT, Primary Examiner

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