US2313300A - Circular weaving loom - Google Patents

Description

March 9, 1943.v H. PELCE CIRCULAR WEAViNG LOOM Filed June 20, 1940 Patented Mar. 9, 1943 CIRCULAR WEAVING LOOM Henri Pelc, Flixecourt, France; vested in the Alien Property Custodian Application June 20, 1940, Serial No. 341,578 In France July 19, 1939 7 Claims.

The present invention relates to circular weaving looms of the type in which the threads are fed approximately horizontally around a well on which the fabric is formed.

It consists in a device for equalizing the length of the warp threads, comprising as many elements as there'are threads, arranged to hold the latter under tension during all the beating phases of the shed. Moreover, these equalizers can also, if desired, act as individual warp-protectors.

Actually known equalizers consist either in movable bars on which pass the groups of threads, or in rods which are flexible or mounted on springs and provided with eyes through which pass the threads, or in rigid platens pivoting about an axis and restored by springs, the threads passing through the eye of said rods and in antagonism to the returning action exerted by the springs.

The inconvenience of the system having movable bars resides in the fact that it cannot ensure the rigoro equali ing of all the threads the beat-' ing of which is not simultaneous; the latter are therefore subjected to very variable tensions; they are even liable to float, resulting in very frequent breakages; Moreover, the device cannot be used as warp-protector.

The inconvenience of flexible rods and pivoting platens resides in the fact that said systems offer constructional difficulties, whilst only procuring results which are often imperfect: the guiding is insuficient in the case of very close warps; the adjacent elements may become entangled and jammed, thus causing breakages of threads which are always prejudicial.

The equalizer forming the subject-matter of the present invention avoids all these inconveniences; it is constituted by thin rods capable of sliding according to their axes, and subjected to the action of a spring adapted to stretch the warp thread passing through an eye carried by said rods; these rods are preferably vertical for reducing to the minimum the friction in the bearings of the supports tending to guide their movement; the eye through which the thread passes is advantageously arranged at the upper part of the rod; the spring is mounted about the lower part of said rod so as to leave all the upper part free.

These individual equalizers allow the use of very close warps; their very principle ensures a rigorous equalizing of the threads without the latter being subjected to excessive strain.

Furthermore, said individual equalizers can be allows, in a circular weaving loom, of doing away with an additional safety member which is always of complicated construction.

The accompanying drawing shows by way of example simply as an indication and not in a limiting sense, a method of carrying out the present invention.

The system is composed of two circular crowns rial or, in default of such, it is electrically insulated from the metal segments 6.

The equalizers 3, 4 carry at their ends eyes I, 8 through which pass the threads 9, Ill coming from the bar H and passing under the circular pulley l2 before reaching the heddles l3, I4.

Said equalizers are pulled upwardly by the springs I5; their rods are electrically connected to the segments 6 only when the collars l6, l1 come in contact with said segments, that is to say at the end of the upward stroke.

The operation is as follows:

The warp threads are stretched and beat so that in normal operation the equalizers do not Y exceed the plane A, and this in order to leave a safet stroke before the collars l6 and Il come in contact with the segments 6. The warp threads therefore work under an approximately constant tension and are not subjected to whippings, peculiar to most of the systems actually used and which are frequently the cause of breakages.

When a warp threads breaks, the corresponding equalizer is released and emerges from the group, which allows it to be easily seen, the closing of the circuit takes place as soon as the collars l6 and I! are in contact with the segment 6 and a suitable device is immediately set in action and automatically stops the loom, in the manner known per se.

It also results therefrom that the loom can only start when all the threads are stretched; the operation is therefore possible only in the arranged to serve as warp-protectors, which then cloth.

best conditions of safety for obtaining a uniform The stretching of the threads is caused, as is known, by exerting an initial braking action on the yarn-beams.

For allowing weaving with any number of warp threads, the equalizers which do not carry any thread can be put out of circuit by hooking up the springs by means of hooks l8, l9 which hold them stationary at the lower end of the stroke.

It is to be understood that if weaving is effected with a double or triple warp thread instead of weaving with a single warp thread, one and the same equalizer can carry two or three warpthreads.

I claim: 7

1. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination two deviating elements for each warp thread and on which said warp thread successively passes, an eye between said I two deviating elements and through which passes said warp thread, resilient means for pushing said eye for spacing away said deviating elements and for causing said warp thread to deviate between said deviating elements, means for guiding said eye relatively to said deviating elements and locking means for holding said eye close to said deviating elements in antagonism to the action of said resilient means.

2. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination two parallel bars on which each warp thread successively passes, an eye between said two bars and through which passes a warp thread, resilient means for spacing said eye away from said bars and for causing said warp thread to deviate between said bars, means for guiding said eye in a direction substantially at right angles to said bars and stopping means for stopping said eye in antagonism to the action of said resilient -means, said stopping means being separately connected to the two poles of an electric current supply. 3. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination two parallel bars on which each warp thread successively passes, an eye between said two bars and through which passes a warp thread, a rectilinear rod rigid with said eye, two parallel platens inwhich are provided axially aligned holes for guiding said rod, means for maintaining said platens spaced from each other, resilient means for pushing said rod for spacing said eye from said bars and for causing said warp thread to deviate between said bars, an abutment collar On said rod, an electric contact on one of said platens and arranged to stop said abutment collar in antagonism to the action of said resilient means, said contact and said collar being separately connected to both poles of an electric current supply.

4. In a. weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination two parallel bars on which each warp thread successively passes, an eye between said two bars and through which passes a warp thread, said eye being placed on one side of a plane passing through said bars, a. rectilinear rod between said bars and having said eye at one of its ends, its free end being located on the other side of said plane, means for guiding said rod between said bars in a direction substantially at right angles to said bars, resilient means for pushing the free end of said rod in the direction of said eye for spacing said eye from said Diane and for causing said warp thread to deviate between said bars and stopping means for stopping said rod in antagonism to the action of said resilient means.

5. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination two guiding elements for each warp thread and on which said warp thread successively passes, an eye for guiding the thread between said two guiding elements and arranged relatively to said elements so as to cause the warp thread to form an acute angle, the sides of which pass through the two guiding elements and said eye forming the apex thereof, resilient means for pushing said eye and spacing it from said guiding elements and means for guiding said eye relatively to said elements guiding the warp thread.

6. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination, two parallel transmission bars on which each warp thread successively passes, an eye for guiding the thread between said two guiding bars and arranged relatively to said bars, so as to cause the warp thread to form an acute angle between said two bars, a rectilinear rod rigid with said eye, means for guiding said rod between said bars in a direction substantially at right angles to said bars, resilient means for pushing said rod for spacing said eye from said bars and stopping means for stopping said rod in antagonism to the action of said resilient means.

7. In a weaving loom, a device for stretching the warp threads rearwardly of the shed, comprising in combination, two parallel transmission bars on which each warp thread successively passes, an eye for guiding the thread between said two guiding bars and arranged relatively to said bars, so as to cause the warp thread to form an acute angle between said two bars, a rectilinear rod one end of which is rigid with said eye, two parallel platens in which are provided axially aligned holes for guiding said rod, means for holding said platens spaced from each other, resilient means for pushing said rod for spacing said eye from said bars and an abutment ring on said rod arranged to abut against one of said platens and to stop said rod in antagonism to the action of said resilient means.

HENRI PELCE'I.

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