US1954071A - Pirn for use in the shuttles of looms for weaving - Google Patents

Description

April 1934- w. A. DICKIE ET AL 1,954,071

PIRN FOR USE IN THE SHUTTLES OF LOOMS FOR WEAVING Filed Aug. 10, 1928 FIG l WILLIAM A. DICKIE LEONARD IATHAM THOMAS H. PLAT Inve rs Attorneys Patented Apr. 10, 1934 UNITED STATES PATENT OFFICE PIRN FOR USE IN THE SHUTTLES OF LOOMS FOR WEAVING Application August 10, 1928, Serial No. 298,666 In Great Britain September 28, 1927 3 Claims. (01. 1s9-213) This invention relates to pirns and more especially to pirns for use in looms employing automatic pirn changing devices.

Various methods have been employed for controlling the tension or drag on the yarn being drawn from pirns in weaving. For instance, under non-automatic conditions of Weaving (i. e. weaving with looms not provided with automatic pirn changing devices) the drag or tension is usually controlled by controlling the ballooning of the yarn from the pirn by means of fur, or by tufting the eye of the shuttle or by bridles.

Generally however such methods of controlling the drag or tension are applied in the shuttle and cause difficulty when it is attempted to employ them when weaving with looms employing automatic pirn changing devices. In such cases the furring or other means employed becomes disturbed on changing a pirn, and, especially with smooth yarns such as artificial silks, there results a defective cloth of slack weft, strained weft, bad selvedges or other faults which generally arise from tension inequality.

According to the present invention the nose of the pirn is formed or provided with a tension controlling or balloon controlling device comprising a neck of circular cross section formed or provided with flanged or enlarged ends or shoulders and having a light ring floating thereon between the flanges, ends or shoulders. The neck may if desired be formed in one with or be an integral part of the pirn, but we prefer to fit a neck of brass or other suitable metal on to the nose of the pirn.

It will be understood that by varying the weight of the floating ring and the clearance between the floating ring and the neck the tension of the yarn may be varied and by these simple means the drag or tension may be altered to suit the count of yarn or other conditions of weaving.

The annexed drawing shows by way of illustration one form of pirn in accordance with the invention it being understood that these are given only by way of illustration and are in no way limitative.

Figure 1 is a view of the pirn, supposed as in the shuttle (not shown) in the operation of weaving and as travelling in the direction of the arrow.

Figure 2 is a section of the tension controlling device on the nose of the pirn. Referring to the drawing, the nose of the pirn l is fitted with a cylindrical neck 2 formed with shoulders or flanges 3 and 4, and having a light ring 5 of circular cross-section floating loose thereon between the shoulders or flanges. The neck 2 and the floating ring 5 are made of brass, steel or other suitable metal.

The neck 2 is formed in two parts, an upper part 6 and a lower part '7 adapted to be screwed together in the manner shown. This construction facilitates the mounting of the floating ring 5 on the neck 2 and readily enables the ring 5 to be changed for a ring of different size or weight.

The neck 2 is mounted on to the nose of the 5 pirn by means of the screw 8 formed with the lower part 7 of the neck 2. Instead of being cylindrical, the neck 2 may have any other shape of circular cross section, for instance, the neck may be concave or inwardly curved, the ends of 7 the curve forming shoulders.

The yarn 10 balloons in passing from the yarn package 11 to the ring 5, passes under the ring 5 and forms a second balloon in passing to the next point of support (not shown) e. g. an eye in the 7 shuttle. When the pirn is travelling in the direction of the arrow the ring 5 is thrown up towards the flange or shoulder 3 and when the pirn is travelling in the opposite direction the ring 5 is thrown down towards the flange or shoulder 4. so

The tension of the yarn may be varied according to the weight of the ring 5 and the clearance between the ring 5 and the neck 2, and according to the chamfering of the shoulders or flanges 3 and 4. 5

As the tension controlling device is fitted to or formed with the pirn itself and the necessity for fitting tension controlling devices to the shuttle itself is avoided, the pirn of the invention is of great use in weaving with looms provided with automatic pirn changing devices, as the tension conditions can be arranged or provided for beforehand on the pirn in the magazine of the loom and similar tension conditions can be arranged or provided for on a number of such pirns in the magazine of the loom.

When weaving with looms employing automatic pirn changing devices the yarn may be threaded under the ring 5 previous to filling up the magazine and similar conditions of tension may be provided for on a number of such pirns before they leave the magazine.

If desired the pirn of the invention may be employed in self threading types of shuttle.

What we claim and desire to secure by Letters Patent isz- 1. A pirn for use in loom shuttles provided with a tension-controlling device comprising a neck of circular cross-section forming a continuation of the small end of the pirn tube, and provided with no enlarged ends, and a ring of circular cross-section freely mounted on said neck between said enlargements and adapted when the pirn is working in a shuttle to move horizontally under the frictional action of the yarn passing through it, and to nip the yarn against the enlarged portion of the neck, so as to impart a controlled tension to the yarn leaving the pirn.

2. A pirn for use in loom shuttles provided with a tension-controlling device comprising a neck of circular cross-section forming a continuation of the small end of the pirn tube, said neck curving inwardly from its ends, and a light ring of circular cross-section freely mounted on said neck and adapted when the pirn is working in ashut: tle to move horizontally under the frictional action of the yarn passing through it, and to nip the yarn against the enlarged portion of the neck, so as to impart a controlled tension to the yarn leaving the pirn.

3. A pirn for use in loom shuttles provided with a tension-controlling device comprising a neck of circular cross-section forming a continuation of the small end of the pirn tube, said neck being constituted by two parts secured together and curving inwardly to the point of connection, and a light ring of circular cross-section freely mounted on said neck and adapted when the pirn is working in a shuttle to move horizontally under the frictional action of the yarn passing through it, and to nip the yarn against the enlarged portion of the neck, so as to impart a controlled tension to the yarn leaving the pirn.

WILLIAM ALEXANDER DICKIE.

LEONARD LATHAM.

THOMAS HEWITT PLATTS.

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