US2797468A - Warp feed equalizer - Google Patents

Description

y 1957 H. M. BROWN 2,797,468

WARP FEED EQUALIZER Filed June so, 1954 INVEN TOR. H GH M- BR N Agricultural College of South i irolina, 'Clemson, S. C., a corporation .of South Carolina Applie'ationl'une 30, 1954, Serial No. 440,312

2 Elaims. or. eta-=35 This invention relates to improvements in warpers and especially to an arrangement for producing improved warps from glass yarn, or any yarn that has low extensibility; by winding all ends at a uniform rate.

According to my invention, the uniformity of winding rate is accomplished by the use of ,apairof warp equalizing rolls which grip all the ends simultaneously and cause them ;to be brought forward at the same rate.

In the warping or beaming process the yarn is first wound on section beams with the ends rather widely spaced. As the winding progresses the yarn will pile up in a little ridge around the beam at the point where each end is guided onto the beam, and there will be small valleys between these ridges of yarn. As the winding continues the ends will wind on the ridges for a time and will then fall down into the valleys and wind there for a time; later when the valleys are filled, more ridges will be built up and the cycle repeated. Since in the usual case the yarn is pulled from packages, with each end controlled by its own tension device, the ends being wound on the ridges will be drawn faster than those running in the valleys. This results in more yarn being wound by the ends on the ridges than those in the valleys, and this difference in winding rate will recur periodically for any given end as the end alternately winds on a ridge and then in a valley.

In the past, when dealing with yarns of relatively high extensibility, it has been the practice when weaving from a beam formed in this fashion to stretch all of the ends to a point where those ends which were wound at a higher rate (i. e., on a ridge) are sufficiently taut to weave satisfactorily. This practice produced a somewhat higher tension in the ends that had been wound in a valley but with yarns of relatively high extensibility this increase in tension was not serious. In the case of glass yarn, however, the extensibility is so small that the ends which were originally wound in the valleys cannot be stretched sufiiciently to tighten the ends which have more yarn in them because they were wound on the ridges.

A primary object of my invention is to provide an improved warper which is capable of making improved warps from yarn by feeding all of the ends to the beam at a uniform rate.

Another object of my invention is to provide a pair of warp feed equalizing rolls which are pressed together and rotated by virtue of the feeding motion of the ends which are passed around the rolls before being wound onto a beam, and which equalize the rate of feed of all of the ends.

Still another object is to provide a pair of equalizing rolls mounted in a novel fashion so as to facilitate the threading up of the warper.

Referring to the drawing, which shows one embodiment of my invention:

Figure 1 is a side elevational view of the warp equalizer as it would appear immediately after the threading-up operation, one bearing standard being omitted for a better showing;

atent Patented July 2, 1957 Figure 2 is a schematic representation of the position of the two rolls during the first step of the threading-up operation;

Figure 3 is a schematic representation of the rolls in the position corresponding to the condition shown in Figure 1; V

Figure 4 is a schematic representation of the rolls "in the operating position; and

Figure 5 is a side elevational view .of the warp equalizer in the operating position, with one bearing standard omitted as in Figure 1.

My warp equalizer comprises a pair of rolls 1, '2 supported in parallel relation by a pairfdf brackets 3 at opposite ends of the rolls. Rolls 1 andfZ ('or at least one of them) are covered with ,a layer of material, suchas rubber, to increase the frictional grip of the rolls on the warp ends passing between them. Roll 1 is rotatable about shaft 4 which is journalled directly inone tend of each bracket 3. At the other end of each bracket ,3 is formed a slot 5, each slot having a block 6 slida'bly mounted therein. These blocks 6 are retained in the slots 5 by means of pins 7. Roll 2 is rotatable about shaft '8 which is journalled in blocks 6. By this construction, roll 2 may be removed from its mounting and separated from roll '1. I I i Brackets 3, carrying rolls 1, 2 are rotatable about shaft 9 which is located to one side of a line joining the center lines of shafts 4 and 8. Shaft 9 is supported in suitable bearings carried by standards 10 which are mounted on the frame of a conventional warper. Shaft 9 is rigidly secured to brackets 3 by locking the shaft in apertured lugs 3a fonned integrally with the brackets at the middle of one side edge thereof. Thus, shaft 9 maintains brackets 3 in proper alignment. The entire roll mounting may be rotated about the axis of shaft 9 by means of a hand wheel 9a mounted on one end of shaft 9. Combs 11 and 12 are part of the usual warper, comb 11 being the front comb adjacent the beam.

Referring to Figure 5, when the warp equalizer is in operation, the yarn W passes from the creel, through comb 12, around roll 1, between roll 1 and roll 2, around roll 2, and through comb 11 to the beam. With the yarn passed around the rolls 1, 2 in the manner illustrated, tension in the yarn tightens the yarn on the rolls and also tightens or draws roll 2 against roll 1, due to the freedom of motion afforded roll 2 by reason of shaft 4 being journalled in sliding blocks 6. This dual gripping action results in each end being fed through the warp equalizer at the same rate, specifically at the peripheral speed of the rolls 1, 2. Any increase in tension which might cause slippage results in an increase in gripping action to prevent such slippage from occurring. As a result, the ends being Wound on the beam in a valley will be under less tension and will be wound looser than the ends being wound on the ridges. This causes a variation in the density of the wind which compensated for the difference in rate of winding which would result if the yarn were wound under a constant tension.

The various stages of threading up the warper are illustrated in Figures 2, 3 and 4. The first step is to rotate brackets 3 to the position shown in Figure 1. It will then be possible to remove pins 7 and remove roll 2 by sliding blocks 6 out of slots 5. The ends of yarn are then threaded up in the usual fashion, passing over roll 1 as shown in Figure 2. Roll 2 is then replaced by sliding blocks 6 into slots 5 and replacing pins 7. The yarn is then gripped between rolls 1, 2 as shown in Figure 3. In order to wrap the yarn around rolls 1, 2 in the desired fashion, the roll mounting is then rotated in a counterclockwise direction until the rolls assume the position shown in Figures 4 and 5. The equalizing rolls are then ready to function in the above-described manner,

mamas As shown in Figure 5, in normal operation roll 1 is arranged in advance of roll 2 in the direction of movement of the warp W, whereby the warp engages considerably more than one-half the periphery of each roll, and

the rolls are located in such position that tension on the warp presses the rolls together. 1

While my warp feed equalizer is especially useful in the beaming of Warp, it is obvious that the equalizer may be used in other situations where the feeding of ends is to be equalized.

I claim:

1. An arrangement for equalizing the feeding of warp ends comprising, a first friction roll arranged on one side of said warp ends transversely thereof, a second friction roll mounted on the opposite side of said warp ends adjacent to and parallel with said first roll, a support mounting said rolls for relative movement towards and away from each other and in a first position with said first roll located above and in advance of said second roll in the direction of movement of said warp ends, whereby said ends engage a major portion of the periphery of said first roll, pass between said first roll and said second roll and thereafter engage a major portion of the periphery of said second roll, and tension in said ends urge said first roll and said second roll together, thereby gripping all of said ends and producing a uniform rate of feed of said ends, means pivotally mounting said support, for turning about an axis parallel to the axes of said rolls to move said rolls into a second position where said second roll is above said first roll, and releasable latch elements embodied in said support for retaining said second roll in said support, said second roll being removable from said support upon release of said latch elements.

2. In a warp feed equalizer, the combination of a pair of brackets, a pivoted support for mounting said brackets in spaced relation along a common axis transversely of the ends to be wound and for turning about said axis, each bracket having a slot formed in one end portion thereof, a block slidably mounted in each of said slots, a first roll journalled between said brackets, a second roll journalled between said blocks adjacent to and parallel with said first roller, said blocks being freely slidable in said slots to move said second roll into free rolling engagement with said first roll, and said pivotal support being mounted to rotate from a position in which said slots are directed upwardly to another position in which the slots are directed downwardly.

References Cited in the file of this patent UNITED STATES PATENTS 791,404 Cooper May 30, 1905 1,140,460 Jaeger May 25, 1915 1,828,918 Balthasar Oct. 27, 1931 2,346,358 Busse Apr. 11, 1944 2,686,018 Courtney Aug. 10, 1954

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