US2923325A

US2923325A - Weft feeders for weaving looms

Info

Publication number: US2923325A
Application number: US566655A
Authority: US
Inventors: Dewas Raymond
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-02-24
Filing date: 1956-02-20
Publication date: 1960-02-02
Anticipated expiration: 1977-02-02

Description

Feb. 2, 1960 R. DEwAs WEFT FEEDERs FOR WEAVING LOoMs 2 Sheets-Sheet 1 Filed Feb. 20, 1956 INVE NTOR: R. Deu/as Ar'ronusas Feb. 2, 1960 R. DEwAs wEFT FEEDERS FOR wEAvING ALooms 2 Sheets-Sheet 2 Filed Feb. 20, 1956 INVENTOR:

ATTQLNEss taes i This invention relates to improvements in weft feeders Yfor weaving looms in which the weft is fed continuously from large fixed bobbins, has reference Ytotheheads arranged on the ends of the needlesor bands of the kind described in the complete specification of my earlier U.S. Patent No. 2,192,728 and has for its` general object to improve the elastic thread clamp on the head ofthe conveying needle. Y

In particular the invention refers to one of the variants described in the said complete specification, namely that in which the part of the thread clamp coming into contact with the side of the head of the conveying needle comprises a shoe-like element simply heldin place by the free end of the blade spring being elastically-pressed against the said surface.

It has been found that such an arrangement may present certain inconvenience because the force of the blade spring on the shoe-like element does not operate with suicient precision and accuracy and such force'may even change in the course of operation.

With the particular View of affecting the application of the force of the blade spring with precision and accuracy and further to enable the position of the point of application of this force `to be regulated properly, thefinvention has the further objects of introducing the following principal improvements. p

Firstly, the shoe-like element of the thread clamp is located in operative position at tworpoints at one of which the force of the blade spring is-applied directly or indirectly to the shoe-like element whilst at the other the shoe-like element is held so as` to allow the element to tilt.

Secondly, in one arrangement described Yhereinafter the shoe-like element is provided with a rearwardly extending prolongat'on that is fixed, with a certain degree of freedom of movement, either on one side of the head of the conveying needle or on the blade spring.

Thirdly, the indirect application of the force of the blade spring on to the shoe-like element is effected by interposing an intermediary part between the blade spring Vand the shoe so as to ensure a correct transmiss'o of the be placed in any one of the recesses more or less distant from the end.

Sixthly, the other part, preferably the shoe-like element, is provided with a groove suitably profiled to receive the ball that constitutes the intermediary part between the shoe and its associated blade spring and Seventhly, the middle part of the blade spring 'is narrow to facilitate its lateral movement under the action of the thread.

These characteristics, as well as others which will appearhereinafter, are fully disclosed inthe following deateet ice scription of the non limitative forms of construction given by way of simple examples and shown in the diagrammatic figures of the drawing attached to this `complete speciiication, in which:

Figure 1 is a plan view of the head of a conveying needle with one form of thread clamp, according to this invention, applied thereto;

Figure 2 is aflongitudinal vertical section taken on Ithe line II-II of Figure 1;

Figure 3 is aplan view of the blade-spring of the thread clamp; y

Figure 4 is a fragmentary detail view in'vertical section taken on the line IV-IV of Figure 3;

Figure 5 is a plan View of the shoe-like element ofthe thread clamp;

Figure 6 is a vertical longitudnal section through the thread clamp taken 'on line VI-VI of Figure 5;

Figure 7 is a verticall transverse section, on a larger scale, through the thread clamp taken on the line VII- VIIfof Figure 5;

Figure 8 is a plan view of a modified form of thread clamp according to this invention;

Figure 9 is a vertical longitudinal section through Figure 8 taken on the line IX-IX of that figure;

Figure 10 is a plan View of the shoe-like element;

Figure 11 is a Vertical longitudinal section through Figure 10 taken on the line XI;XI of that figure; and

Figure l2 shows a vertical transverse section through Figure 10 taken on Ithe line XII-XII of that figure and drawn to a larger scale.

In these figures' 1 is the conveying needle of which the side 1a faces the reed on the batten and the side 1b faces the cloth, 2 is the point of support for the' thread and 4 is the cutting blade.

The thread clamp, arranged toholdthe thread 3 during its passage into the head of the conveying needle, is constituted by the co-operation of the Wall 1c of the needle with the shoe S, being'pressed there against by the blade spring 6 mounted on the wall lfby means of the screws 7 and 7. This arrangement enables the pressure exerted by the blade spring 6 vto be regulated by adjustment of the screw 7 whose head is in Contact with the outer surface ofthe blade spring. Y

The front end of the blade spring' is provided with several recesses 8, the three shown in the drawings, each being adapted to accommodate the ball 9 which constitutes an intermediary 'part transmittingthe force of the pressure exercised by the blade spring to the shoe-like element 5. n

The shoe-like element 5 has the longitudinal' groove 10 of suitable prole (that may be of V-shape as shown or perhaps of U-shape with rounded or at bottom) to co-operate with the ball 9.

The ball 9 which may be of steel, industrial stone, agate or other suitable pressure transmitting material, has the advantage of always correctly transmitting the pressure from the blade spring to the shoe-like element regardless of the relative positions of these parts.

The three recesses 8 are made by countersinking holes so spaced that the countersinks overlap to suchex'tent as to enable the ball 9 to be easily shifted from-one to another so that the force of the pressure of the spring can be applied precisely at the point necessitated by the nature of the thread, its thickness and 'so on.

The shoe-like element 5 has a rearwardly extending prolongation 5a terminating in a stub 5b which cannot come into contact with the wall 1c unless thethread 'is engaged by the thread clamp.

The stub 5b is loosely fitted onr the stud 11 the stem of which is mounted in the wall 1c. In' this way 'the stud 11 and the ball 9 constitute two poi-nts ofv 'support that assure the position of -ldie shoe-like element. In

` allow it to rise under the action of the thread.

surfaces, and a ball housed selectively 'recesses and in said groove. j

use when the thread engaged by the thread clamp, the pivoting of the shoe-like element takes place around the stub 5b.

lf the blade spring 6 is, as shown, narrow at its middle part, the shoe-like element, when actuated by the thread, can move laterally, by rotationabout the stud 11, with sufiicient amplitude, which although small, facilitates the discharge of impurities.

The fact that the stud 11, around which the shoelike element S pivots when the thread enters the thread clamp, is located at a distance from the zone of clipping, has the advantage that the shoe-like element, when rising, assumes only a small inclination and that its rear end a is raised so that impurities are easily discharged to the rear which is of advantage, inter alia, when handling a fluffy thread or a thread having motes.

The modified construction shown in Figures 8 to 12 differs from that already described by the fact that the shoe-like element 5 has no rearwardly extending prolongation and that, instead of being mounted on the wall 1c, it is attached loosely to the blade spring by the stud 12 which passes freely through the rear part so as to construction the two points of support are constituted respectively by the ball 9 and the stud 12.

It is to be understood that without exceeding the scope yof the invention, variants and improvements in detail can be conceived. Y

For instance, the fixing of the rearwardly extending I tegral with the stub 5b and pass through a hole in the l wall 1c.

Alternatively the rear part of the shoe-like element may be rounded to allow, when the weft feeder returns to its position outside the fabric, of the insertion of a cleaning sheet mounted, for example, inside the head of the conveying needle, behind the shoe-like element on the end of a rod co-operating with a stationary abutment for moving the sheet into the thread clamp and with an elastic arrangement for bringing the sheet back to its rest position.

What I claim is:

l. A thread clamp for the conveying needle of a weaving loom with a stationary weft supply bobbin, having, in combination, a cantilever blade spring anchored at one end thereof on the body of the conveying needle, an elongated shoe-like element having a portion thereof adapted to bear flat against a part of the conveying needle, said shoe-like element being shorter than said In this blade spring and being tiltably maintained at two points thereof longitudinally spaced apart, namely, at a first point by the free end of the blade spring which urges said element against the needle body, and at a second point located between said first point and the point where said blade spring is anchored on the needle body,iwhere by said shoe-like element is capable of orienting itself independently of said blade spring in any direction and to vbear flat over its entire contact area against said needle part.

2. A thread clamp according to claim 1,'further comprising means for adjusting the position of said first maintaining point longitudinally of said blade spring and shoe-like element. Y

3. A thread clamp according to claim l, further comprising means for adjusting the position of said first maintaining point longitudinally of said blade spring and shoe-like element, lsaid first point adjusting means comprising a plurality of recesses in one of the two facing surfaces of the free end of the blade spring and shoe-like element, a longitudinal groove in .the other of said two in one Yof said 4. A thread clamp for the conveying needle of a weaving loom with a stationary weft supply bobbin, having, in a combination, a cantiliver blade spring anchored at one end thereof on the body of the conveying needle, an elongated shoe-like element having a portion thereof adapted to bear fiat against a part of the conveying needle, said shoe-like element being shorter than said blade spring and being tiltably maintained at two points thereof longitudinally spaced apart, namely, at a first point by the free end of the blade spring which urges said element against the needle body, and at a second point by a stud located on said needle body between said first point and the point where said blade spring is anchored on the needle body, whereby said shoe-like element is capable of orienting itself independently of sail blade spring in any direction and to bear flat over its whole area against said needle part.

5. A thlead clamp for the conveying needle of a weaving loom with a Vstationary weft feeding bobbin having, in combination, a cantilever blade spring adjustably anchored at one end thereof on the body of the conveyng needle, an elongated shoe-like element having a portion thereof adapted to bear fiat against a part of the conveying needle, said shoe-like element being tiltably maintained at two points thereof longitudinally spaced apart on said clamp so that said shoe-like element is capable of orienting itself in any direction and to bear flat over its whole contact area against said needle part, a rearwardly projecting prolongation on said element, a stud on the blade spring tiltably tto-operating with the rear end of said prolongation and means for transmitting the force of the pressure of the blade spring to the shoelike element to said element against said conveying needle.

6. A thread clamp for the conveying needle of a weaving loom with a stationary weft feeding bobbin having, in combination, a cantilever blade spring adjustably anchored at one end thereof ou the bodyof the conveying needle, an elongated shoe-like element having a portion thereof adapted to bear flat against a part of the conveying needle under the action of said blade spring, said shoe-like element being tiltably maintained at two points thereof longitudinally spaced apart on said clamp so that said shoe-like element is capable of orienting itself in any direction and to bear llat over its whole contact area against said needle part, a plurality of recesses in the free end of the blade spring facing the shoe-like element, a longitudinal groove in the said element facing the blade spring and a ball housed in one of the said recesses and in the said groove, said ball constituting one of said two longitudinally spaced points at which said shoe-like element is maintained.

7. A thread clamp for the conveying needle of a weaving loom with a stationary weft feeding bobbin having, in combination, a cantilever blade spring adjustably anchored at one end thereof on the body of the conveying needle, an elongated shoe-like element having a portion thereof adapted to bear fiat against a part of the conveying needle under the action of said blade spring, said shoe-like element being tiltably maintained at two points thereof longitudinally spaced apart on said clamp so that said shoe-like element is capable of orienting itself in any direction and to bear flat over its Whole contact area against said needle part, a rearwardly projecting prolongation on such element, a stud on the conveying needle tiltably co-operating with the rear end of said prolongation, a plurality of recesses in the free end of the blade spring facing the shoe-like element, a longitudinal groove in the said element facing the blade spring and alall housed in one of the recesses and in the said'groove saidY ball and said stud respectively constituting said two longitudinally spaced points at which said shoe-like element is maintained.

v8. A thread clamp for the conveying needle of a weaving .loom with a stationary weft feeding bobbin having, in combination, a cantilever blade spring adjustably anchored at one end thereof on the body of the conveying needle, an elonga-ted shoe-like element having a portion thereof adapted to bear at against apart of the conveying needle under the action of said blade spring, said shoe-like element being tiltably maintained at two points thereof longitudinally spaced apart on said clamp so that said shoe-like element is capable of orienting itself in any direction and to bear at over its whole contact area against said needle part, a rearwardly projecting prolongation on said element, a stud on the blade spring tiltably co-operating with the rear end of said prolongation, a plurality of recesses in the free end of the blade spring facing the shoe-like element, a longi tudinal groove in the said elementfacing the blade spring and a ball housed in one of the said recesses and in the said groove said ball and said stud respectively constituring said two longitudinally spaced points at which said shoe-like element is maintained.

References Cited in the file of this patent UNITED STATES PATENTS l0 2,119,573 Dewas June 7, 1938 2,192,728 Dewas Mar. 5, 1940 2,567,993 Dewas Sept. 18, 1951 2,586,638 Flamand Feb. 19, 1952