US3026911A

US3026911A - Method of adjusting amplitude of sheds while weaving

Info

Publication number: US3026911A
Application number: US619786A
Authority: US
Inventors: Picanol Jaime
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-12-17
Filing date: 1956-11-01
Publication date: 1962-03-27
Anticipated expiration: 1979-03-27

Description

March 27, 1962 J. PICANOL 3,026,911

METHOD OF ADJUSTING AMPLITUDE 0F SHEDS WHILE WEAVING Filed. No v. 1, 1956 5 Sheets-Sheet 1 PIP miJWJL Arm/Mex:

.1. PICANOL March 27, 1962 METHOD OF ADJUSTING AMPLITUDE OF SHEDS WHILE WEAVING 3 Sheets-Sheet 2 Filed. Nov. 1, 1956 J P lcanol p54? M W ATTQQNE' J. PICANOL March 27, 1962 METHOD OF ADJUSTING AMPLITUDE OF SHEDS WHILE WEAVING Filed Nov. 1, 1956 3 Sheets-Sheet 3 INVENTOR JA'lME PICANOL ATTORNEYS ilnited States Patent O.

METHOD OF ADJUSTING AMPLITUDE OF I SHEDS WHILE WEAVING .laime Picanol, Casa Pairal Catalunya, Zandberg,

Zillebeii-lez-Ypres, Belgium Filed Nov. 1, 1956, Ser. No. 619,786 Claims priority, application Belgium Dec. 17, 1955 1 Claim. (Cl. 139-79) In weaving looms substantial advantages may be gained as well known by using such heddle frame driving mechanisms as will permit adjustment of the height of the shed even while the loom is in operation.

The known mechanisms for this purpose are fundamentally arranged so as to permit the adjustment of the movement of all heddle frames simultaneously. Said adjustment is essentially intended for reducing the risk of thread breaks, in order to reduce the length of time during which the loom is inoperative. Consequently, said known mechanisms are used exclusively to enhance the quantitative efficiency of the loom. In fact, as is well known, the risk of thread rupture may be reduced by making the shed as small as possible. However, for certain products and particularly those in which the threads are subject to very high tension, one has to increase the height of the shed, lest the passing of the shuttle be unduly impeded as a consequence of the braking action of the warp threads.

The present invention relates to a process whereby not only the quantitative, but also the qualitative efficiency is contemplated. This aspect is of considerable importance inasmuch, as is well known, any breaking of threads is liable to leave traces in the fabric. The novel process has basically resulted from the fact, as has been established by applicant, that it is desirable and for the production of certain articles highly attractive, to be able to impart unequal amplitudes to the heddle frames, or to groups of heddle frames in one and the same loom. Tests made in this connection have proved that the grain or the appearance of the fabric may considerably be improved by judiciously choosing a different amplitude for the movement of each heddle frame or group of heddle frames, it being also possible thereby to further increase the working efficiency by reducing to the bare minimum the number of thread breaking cases and consequently the times of untimely or unforeseen stoppage of the loom.

The invention therefore provides a novel weaving method essentially characterized in that some of the heddle frames move with different amplitudes as compared with other heddle frames within the same loom. For this purpose use may be made of certain known heddle frame driving means, eg such as are disclosed in the US. Patent No. 2,681,078 of the applicant, however, using, according to the present invention, a number of mechanisms such as described therein, in accordance with the number of heddle frames or groups of heddle frames requiring individual adjustment of their motion amplitude, i.e. independently of the other heddle frames or groups of heddle frames.

The invention also contemplates the mechanical means, or groups or combinations of such means, applied or at least liable to be applied in one and the same loom, with a view to putting into effect the process according to the invention.

One mode of application will, by way of an example, be described hereinafter with reference to the accompanying drawings, it being evident that within the scope of the invention many other combinations may be resorted to.

FIGURE 1 is a dia'grammatical side elevational View of a loom showing the principal elements thereof such 3&2 6,91 l Patented Mar. 27, 1962 2 as will permit to locatethe mechanism whereby the novel weaving process according to the invention may be put into effect;

FIGURES 2 and 3 are diagrams for the purpose of illustrating the way in which two dilferent sheds may be realised in one loom;

FIGURE 4 is a perspective view showing the principal and characteristic parts of duplicate heddle frame driving means, permitting the application of the method according to the invention;

FIGURES 5 and 6 are diagrams showing different heddle frames having diiierent amplitudes.

In order to put the method of the invention into effect, it sufiicies "to provide for any such means as will be capable of changing the amplitude of angular motion of the rocking levers which impart to the heddle frames the reciprocatingmovement required for producing the shed. Thus, each of the heddle frames may be associated with its own independent and individually adjustable driving mechanism, or said heddle frames may be grouped, each group of heddle frames required to produce equal heights of shed being provided with a common driving mechanism.

The diagrams of FIGURES 2 and 3 are schematic representations of a mechanism of utter simplicity, whereby it is rendered possible to use, as before, a common cam shaft for all of the driving levers, and yet to permit the latter to produce different amplitudes of the reciprocating movements of their respective heddle frames. For this purpose the driving mechanism has been so arranged as to permit such relative movement of each of the levers with respect to its cam disc, as will shift the tangent point, i.e. the application point of the heddle frame driving forces. By so shifting the point of application of the driving force exerted by said cam disc on said lever, the distance between said application point and the pivoting centre of the lever is modified and consequently the length of the are through which the end of said lever moves is also changed.

Considering the lever 1 in FIGURE 3 which is pivoted at 2 and connected at 3 to one of the heddle frames, if said lever is permanently held in contact with the driving cam 4 which rotates about its axis 5, said rotating cam will cause point 3 to be deflected through the height H, whereby the reciprocating amplitude of the heddle frame is also equal to H. The resulting shed height is also equal to H (see FIGURE 2). Therefore, in this case, said height of the shed depends on the distance between the pivot point 2 of the lever 2, and the tangent point of said lever on said driving cam 4. Said lever is hinged at 2, to the end of a crank 6. It suffices to rotate said crank through a certain angle or so as to cause the lever 1 to shift lengthwise with respect to the cam disc 4, in order to increase the distance d, which now becomes D. The lever may for instance be shifted to the position indicated by 1. In this position, the lever 1' is hinged at 2' and its end 3' has drawn nearer to the tangent point of said lever 1' on said cam disc 4. For an equal rotation of said cam disc, as in the previous case, the end 3 of said lever 1' is now deflected through a height h (FIGURE 3), which corresponds to a smaller shed, which may also be given as h (FIG- URE 2).

Thus, by the simple process of changing the relative position of the heddle frame driving levers with respect to their respective driving cams, it will be possible, without changing said cams or their movement, to change or to adjust the shed of the different heddle frames in one and the same loom each in a different way, for a given Weaving operation.

It will be understood that many other means or mechanisms may be adapted for the application of the process according to the invention. 1

FIGURE 4 shows an embodiment of the cranks such as 6, each of which is independently rotatable around a common axis 7 and is controlled by means of a rod 8 adequately supported as at 9 and at its end provided with a control knob 10. The other parts of the mechanism are such as known, e.g. from the US. Patent No. 2,681,078 of the applicant.

In the example shown in FIGURE 4 the levers are divided in two groups, each group being individually controlled by one of the cranks 6; obviously more than two cranks may be provided without any difliculty.

FIGURES 5 and 6 are diagrams illustrating the use of cams b for operating different levers a, so that different heddle frames d may be operated with different amplitudes. The angular displacements of the heddle frames are indicated by a and 6, while the linear displacements are indicated by h and H.

The invention extends as well to the weaving process, inasmuch in one loom and for one weaving operation heddle frames are so moved as to produce different sheds, as to the mechanisms or parts of mechanisms specially intended for this purpose.

3,02 ,911 p a t I p,

What I claim is:

In a process of producing a plain Woven fabric in which the warp threads are threaded through a plurality of heddle frames and reciprocating motion is imparted to said heddle frames so as to divide for each weft pick the sheet of warp threads into'upper and lower warp threads forming the shed through which the shuttle is made to pass, said heddle frames being divided into groups of adjacent frames, the step of changing the amplitude of reciprocation of a group of heddle frames without changing the amplitude of the rest of the heddle frames.

References Cited in the file of this patent UNITED STATES PATENTS 2,073,227 Shearer Mar. 9, 1937 2,187,814 Brown Jan. 23, 1940 2,355,531 Holmes Aug. 8, 1944 2,355,532 Holmes Aug. 8, 1944 2,356,713 Tuten Aug. 22, 1944 2,437,349 Cobb Mar. 9, 1948 2,477,248 Harding July 26, 1949 2,477,249 Harding July 26, 1949 2,681,078 Picanol June 15, 1954