US2441802A - Weaving loom having a continuous weft supply - Google Patents

Description

R. DEwAs 2,441,802 WEAVING Loom HAVING A CONTINUOUS WEFT SUPPLY May 18, 1948 Filed Oct. 12, 1938 INVENTOR RAYMOND DEWAS ATTORNEYS Patented May 18, 1948 WEAVING LOOM HAVING A CONTINUOUS WEFT SUPPLY Raymund Dewas, Amiens, France ApplioatiomOctoberlZ', 1938, Serial No. 234,548 In France ctober30, 1937 Section 3', Public Law 690, August 8, 1946 Patent expires October 30, 1957 3 Claims. 1

The invention relates/to weaving looms having a continuous weft supply by means of large fixed bobbins and having weft inserting members without a cop, such for example as those of the needle's type described in applic'ants United States Patent No, 2,072,161.

In these looms, if a satisfactory selvedge is to be obtained, it is in most cases necessary to reduce temporarily, near the fell, .the angle of opening formed by the selvedge threads or the divided warp sheets, 50 as to hold-the turned inend of the weft for forming a fast selvedge.

Hitherto this result has bee'n obtained by means of a part provided with a slit through which the selvedge threads of the two divided warp sheets pass. However, this means has various drawbacks which it is the purpose ofthe invention to overcome.

For this purpose, the invention has for its -ob ject a device which may be called selvedgepresser owing to its actual function and which not only does not possess the drawbacks of the known means, but further has numerous advantages.

Said device mainly comprises a movable'part called presser which is intended to bear on the selvedge threads of only one of the two divided warp sheets, in order to reducethe angle of opening, said presser being combined with means adapted to cause under its :action, the depression of the Various selvedgethreadsito 's'tart'su'cc'essively, beginning from the edge of the selvedg'e towards the cloth, and the degree of depression of said threads .to decrease gradually, likewise beginning from the edge of the selvedge towards the cloth. I

The invention has furthermore for its object an embodiment of a selvedge-presser to which it would seem that preference should be given and by means of which a well finished selvedgeis obtained in a practical manner;

By way of a constructional example, saidpreferred embodiment of a -selvedge=presser operating according to the above explained "features, is described hereinafter and illustrated in the accompanying draw-ingin which:

Fig. 1 is a side elevational-view thereof,

Fig. 2 a top plan view, and

Fig. 3 a partial view or the presser, in vertical longitudinal section.

In the example shown, the presser I, which is adapted to bear 'on the selv'edg'e threads of the upper divided warp sheet, is arranged parallel, or nearly parallel, with the fell and acts by downward motion. For this purpose, it is fixed 2 to :theend of a lever 2 which oscillates 'in'a plane that may be parallel with the selvedge, the other end of said lever being connected in an adjustable manner, by means of bolts or otherwise, to the tongue 3 of a bush 4 passed over a horizontal journal '5 and held by a stop ring 6.

This assembly thus mounted for oscillation on the journal '5, is adjustably fixed to the lower part of the frame or support '6 of the temple, by passing the end of the journal 5 through a slide 8 in which it is locked by nuts 9. The pressing position of the part i on the selvedge threads is ensured by a spring iil attached to a projection H which is secured to the bush whereas the lifting by swinging the lever 2 is preferably effected by the forward movement of the'slay (the reed of which must not come into contact with the presser bar I) by means, for example, of a rod 12 which is fixed by one end on the lever 2 and the other end of which is lifted by the reed cap of the slay.

The adjustment of the pressure of the part on the selvedge threads is obtained by limiting at will the downward travel of the lever 2, by means of an adjusting bolt 53 which passes, through an, ear id of the support I and the head of'which is covered with a thickness 55 of fibre,

for example, inorder to absorb the slight impact of the lever 2 when it abuts against said bolt head, the position of which is fixed by means of spacing washers, the whole arrangement being locked by the nut Hi.

In this device, in order to ensure it a char 'acteristic operation as explained above, that is to say in order that the beginning of the downward movement of the selvedge threads of the upper warp sheet towards those of the lower warp sheetmay be efi'ected successively, starting from the'first selvedge thread and in gradually decreasing degrees of downward movement, likewise starting .f-rom the first selvedge thread, the preferred means which is proposed for this purpose consists in giving the face of the presser l, which is intended to come into contact with and to bear on the 'selvedge threads a, an appropriate slope i relatively .to the plane passing throughsaid selvedge threads of the divided warp sheet, as shown in Fig. '3, it being furthermore possible, under the action of the tension of the weft thread introduced into the inlet of the shed, and owing to this fact, for the first threads of the selvedge to be slightly displaced towards the cloth, thereby also contributing to the obtaining of a perfect selvedge.

out a cop penetrates into the shed and enf counters on its path the part of the weft thread which is still connected to the fell and which comes from the supply bobbin, which part of thread it folds over in the inlet of the shed;

At the same time, the presser I, which is re tracted by the spring I0, moves downwards 'towards the selvedge warp threads of the upper sheet a. However, the adjustment of the rod I2 is effected in such a manner that the contact between the face l of the presser I and said selvedge threads at only takes place successively after the part of the weft thread which is still connected to the fell 0 is introduced into the inlet of the shed owing to the actual penetration of the weft inserting member without cop.

Immediately afterwards, the weft thread thus introduced into the inlet of the shed is cut by the cutting member used in this case, and its end,

at this instant, can no longer move owing to the fact that it is held stationary by the presser I which has reached or nearly reached the end of its travel and has brought the selvedge threads (1 to a by pressing them on the selvedge threads I) of the lower divided warp sheet.

When the slay moves forwards, the presser I is lifted before the weft is beaten, but the end of the weft thread cannot effect an untimely movement in the selvedge, owing to the fact that at this instant, the change of shed is sufficiently advanced.

It is of course understood that without exceeding the spirit of the invention, changes, improvements and additions may be made, and also the use of equivalent means may be considered.

Thus, for example, for lifting the presser l by the forward movement of the slay, the rod I2 may be adjustably mounted, or not, on the bush 4 and be lifted by a slope fitted under the slay, the end of said rod I2 being in this case preferably provided with a roller.

Similarly, instead of having an upward and downward motion, the presser could, for example, have a semi-circular alternating motion in a horizontal plane, the pressure on the selvedge threads of one of the divided warp sheets being at its beginning, always exerted successively by the slope of the face I of the presser I advancing towards the selvedge.

Similarly again, the presser I may be inclined relatively to the fell instead of being parallel or nearly so.

Finally, the presser I or the lever 2 may be used as a support for the cutting blade when the latter is mounted outside the weft inserting device,

I claim:

1. A selvedge-pressing device for looms having a continuous weft supply by means of large fixed weft bobbins and a weft inserting member without a cop, said device comprising movable pressing means for hearing on the selvedge threads of only one of the two divided warp sheets to reduce the angle of opening thereof, said pressing means including means for depressing said selvedge threads successively at the beginning of the downward movement thereof, starting from the edge of the selvedge of the cloth, and whilethe degree of depression on said threads gradually decreases from the edge of the selvedge; and means connected with said pressing means for actuating the same, the actuating means moving the pressing means up and down.

2. A selvedge-pressing device for looms having a continuous weft supply by means of large fixed weftbobbins' and a weft inserting member without, a cop, said device comprising a movable presser for bearing on the selvedge threads of only one of the two divided warp sheets to reducethetangle of opening thereof, said presser having a'face contacting said selvedge threads and being longitudinally inclined in the direction of the edge of the selvedge towards the cloth, whereby said selvedge threads are depressed successively at the beginning of the downward movement thereof, starting from the edge of the selvedge of the cloth, and while the degree of depression on said threads gradually decreases from the edge of the selvedge; and means connected with said presser for actuating the same, the actuating means moving the presser up and down.

3. A selvedge-pressing device for looms having a continuous weft supply by means of large fixed weft bobbins and a weft inserting member without a cop, saidlooms also having a temple support and a slay having a reed cap; said device comprising a presser movablesubstantially vertically for bearing on the selvedge threads of the upper divided warp sheet, said presser extending substantially perpendicularly to the selvedge and above the same, a lever carrying an end of said presser, a journal fixed to the lower part of said temple support and carrying said lever, said lever being swingable about said journal, a retracting spring connected with said lever to cause the downward movement of said presser, and a rod secured to said lever and adapted to be raised by the reed cap of the slay when the slay moves forward to beat up the weft to cause the upward movement of said presser, said presser having a lower contact surface adapted to bear on the selvedge threads and inclined in the longitudinal direction, said inclination beginning outside the selvedge and terminating at the end of the presser toward the cloth.

RAYMOND DEWAS.

REFERENCE S CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number

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