US2413881A - Separating device for leased warp threads in weaving-preparing machines - Google Patents

Description

Jan. 7, 1947 ME|ER 2,413,881

SEPARATING DEVICE FOR LEASED WARP THREADS IN WEAVING-PREPARING MACHINES Filed April .5, 1946 2 Sheets-Shet 1 Jan. 7, 1947. H. MEIER 2,413,331 SEPARATING DEVICE FOR LEASED WARP THREADS IN WEAVING-PREPARING MACHINES Filed April 3, 1946 2 Sheets-Sheet 2 Patented Jan. 7, 1 947 THREADS CHINES- IN- WEAVING-PREPARING, MA-

Heinrich Meier, U'ster. Switzerland, assignor" to Zellweger'A. G. Apparateund Maschinen--- fabriken-Uster, U'ster,. Switzerland Application. April 3, 1946,. SerialNo, 659,369 In Switzerland April 12,1945

, 8 Claims. 1

My present invention relates toa device for separating leased warp threads in weaving-preparing machines, in which, as each foremost thread is separated off, the next following thread in the series of warp threads. is heldback.

In contradistinction. to known devices of this kind, the present device has a separating body capable of rocking to and fro about an axis with two separating fingers disposed opposite one another and with each of which a depression for the reception, of a warp thread to be separated ofi is associatedv on the front: side of the separating body, a separating arm in the form of a double wedge being disposed between the two separating fingers; the whole in such arrangement that, on the separating body turning in one direction, the foremost warp thread is caught by the separating arm, being guided over, one of the wedge surfaces of. the latter behind the separating fingerremote from this surface and being, released by the other separating finger, whilst, on the separating body turning in the other direction, the next following thread in the series of warp threads is caught by the separating arm, being, guided over the second wedge surface of the latter behind the separating finger remote from this surface and being released by the second separating finger.

This permits of separating oli each warp thread reliably without injury by means of only a single" working element; formed by the separate ing body, that is, in a relativelysimple manner; pushers, driver tubes fitted with lease bands or similar Workin elements, such as have hitherto been in common use, being avoided. The known constructions are complicated and are apt to cause such heavy stresses on the warp threads that the latter, especially those of a delicate nature, are injured and even break, whereby faults in the separating work and breakdowns may occur, and the eiliciency of the particular weaving preparing machine, for instance a warpthread tying machine, thus is reduced. Moreover, lease bands are themselves exposed to considerable wear.

A constructional example of the arrangement according tothe invention will now be described with reference to theaccompanying drawings-.-

Fig. 1 shows the separating body in rear view with a section through its rotary shaft,

Figs. 2 and 3 are similar views, but with'theseparatingbody in a differentangular position from" that: of Fig; 1, for explainin its manner of operation in one direction ofrotation,

Fig. 4 shows a front view of the separating body in the same angular position as Fig; 1, Fig-{Bis aviewirom belowof F-ig; 4,"

The separating body is furnished with a substantially circular, fiat disc I with a central driving shaft 2 which at one end is formed into a thickened, cylindrical peg 3 (Fig. 5) adjoining the front sideof the disc l and terminates in a conical point 4. The separating body by means of the shaft 2-, is borne for rotation in a bearing 5 which is mounted on a carriage, not shown, which is slidably guided and is provided with a feeler. Thisfeeler so co-operates, in a known manner, with the warp threads to be separated, that, when the feeler is performing its proper feeling motion, the drive of the said carriage is temporarily out in, and. the latter in consequence performs a stepby-step travelling motion, while the drive of the separating body is operating. At the other end of the shaft 2, a fork-shaped operating lever B is fixed, the prongs of which engage on both sides of a driving bar not shown, by which, when the separating device is in operation, the driving lever 5 is alternately rocked out of the position shown in Fig. 4 in full lines into the position indicated in chain-dotted lines and back again; the shaft 2 and the disc I thus being turned to and fro about their axis in a corresponding manner, The disc 1 is formed at its periphery into the two separating fingers 1 and S, disposed opposite one an other, between which is located the radially directed separating arm 9 which is uniformly tapered towards the periphery of the disc and ends in a point. On the side corresponding to the rear side of the disc I, the separating arm 9 has its two longitudinal edges formed into wedge-shaped surfaces It and II respectively. The latter are inclined oppositely with respect to one another, so that the separating arm 9 forms a double wedge; on the front side of the disc I the separating arm 9 has its free end portion beveled off, whereby the point of the separating arm is brought between the front and rear side of the disc i', as shown inFigs. 8 and 10'. The wedge shaped surface Id of the separating-arm 8 faces the separating finger I, and the wedge-shaped surface I l faces the separating finger 8, Between each of the two wedge-shaped surfaces it and i 5 and, the adjacent separatingfin-ger I and ii respectively, there is a guiding slot l2 and 3 respectively for'the receptionof the thread, which is open'a-tthe periphery of the disc! and i's'thus freely accessible. On the first side of the disc I. each of the two separating fingers I and 8 is provided with a. depression I4 and I respectively, forming continuations at the base of the corresponding guiding slot I2 and I3 respectively and being widened towards the periphery of the disc I. The two separating fingers 1 and 8, due to being suitably tapered, terminate in points which lie between the front and the rear side of the disc I. The disc I of the separating body is of symmetrical formation with respect to the centre plane of the radial separating arm 9.

As will be seen from the drawing, the driving shaft 2 lies midway between the two lease or dividing bars I6 and I I, both of the same diameter, parallel thereto, but outside the crossing point of the two groups A and B of warp threads, and so far above the crossing point that the central peg 3 provided on the front side of the disc I bears lightly on the warp threads of the groups A and B, when these come within range of the cylindrical part 4 of the said peg 3, in Figs. 1 and 4, the foremost thread of the group A is in th region of the depression I4 in the disc I, associated with the guiding slot I2. Owing to the corresponding pressure of the disc I against the warp threads to be separated off and the tension in the threads, caused thereby, the said foremost thread will of itself have entered into engagement with the said depression I4, and the separating work thus already will have been initiated. According to Figs. 1 and 4, the separating body occupies the one terminal position, out of which it is moved, when the separating device is in operation, through a suitable rotation (the direction shown by the arrow in Figs. 1, 2 and Figs. 4, 7) into the other terminal position shown in Figs. 3 and 9, whereupon it turns back again into what is here assumed as the initial position. When the separating body is turned out of what is assumed in the drawings to be the position of rest, the tensioned foremost thread of the group A, which is lying in the said depression I4 and in the region of the guiding slot I2, will be seized by the separating arm 9 and guided by the wedge-shaped 5 surface If) of the latter on to the rear side of the separating arm 9 and thereby also of the separating finger 8, being thus moved out of the rotary path of the separating finger 8, as will be seen from Figs. 2, 7 and 8. Consequently, the said thread passes, as shown in Figs. 3, 9 and 10, out of the path of the separating finger 1 and is therefore liberated by it, whereupon the thread under the influence of its own tension moves completely onto the rear side of the disc I and consequently out of the rotary path of the separating finger l, The said thread has thereby been separated out of the group A, and the separating body has reached its corresponding terminal position. In the latter (Figs. 3, 9), the foremost thread of the group B is in the region of the guiding slot I3 and of the depression I5 of the disc I, associated with the corresponding separating finger 8, with which depression this thread has of itself come into engagement, owing to its own tension. Thereupon the separating body i turned back into the initial position according to Figs. 1, 4 and 5, the tensioned foremost thread of the group B, which lies in the depression l5 of the disc I and in the path of the guiding slot I3, being seized by the separating arm 9 and guided by the wedge-shaped surface H thereof onto the rear side of the separating arm 9 and, therefore, also of the separating finger "I, whereby it is caused to move out of the rotary path of the latter. Consequently the said thread passes out of the path of the separating finger and is liberated by it, whereupon the thread, under the influence of its own tension, moves completely onto the rear side of the disc I and consequently out of the rotary path of the separating finger 8, the said thread thus having been separated out of the group B. The described working cycle is then repeated, as long as the separating body is within reach of the warp and the shaft 2 of the separating body is turned to and fro by the driving lever 6.

The conical point 4, provided on the front side of the disc I, assists the satisfactory forward feed of the separating device transversely over the warp, whilst the arrangement of the points of the two separating fingers I and 8 between the front and the rear side of the disc I assists the reliable engagement of each separating finger between the foremost thread to be separated off and the thread next following it in the series, and the analogous arrangement or displacement of the point of the separating arm 9 assists the separating work, as will be obvious.

As the separating device can move transversely over the warp to be treated, without the warp threads having to be out off after being separated, the interlacing of the warp remains, as is necessary in many weaving preparing machines, for instance in those with stop strips to be mounted on the separated warp threads or in thread serving machines. For such preparing machines, known separating devices, in which the warp lease has to be destroyed each time, cannot be used. A further advantage of the described separating device is that one is enabled to work simultaneously with several separating bodies spaced above one another or side by side, for instance in order to be able to separate in one and the same operation the leased threads of two warps arranged above one another or vertically, such as in warp-knotting or similar machines.

What I claim and desire to secure by Letters Patent is:

1. A device for separating leased warp threads in weaving preparing machines, in which, as each foremost thread is separated. off, the next following thread in .the series of warp threads is held back, comprising a rockably mounted separator provided with two opposite separating fingers and with a depression each disposed on the front side thereof, said recesses being adapted to receive a warp thread to be separated off, and a separating arm in the form of a double wedge disposed between the two separating fingers, the whole in such arrangement that, on the separator turning in one direction, the, foremost warp thread is caught by the separating arm, being guided over one of the wedge surfaces thereof behind the separating finger remote from this surface and being released by the other separating finger, whilst, on the separator turning in the opposite direction, the next following thread in the series of warp threads is caught by the separating arm, being guided over the second wedge surface of the latter behind the separating finger remote from this surface and being released by the second separating finger.

2. A device as claimed in claim 1, wherein each of the two depressions provided on the front side of the separator for the reception of the thread, forms a continuation at the base of a thread guiding slot disposed between the particular separating finger and the separating arm.

3. A device as claimed in the claim 1, wherein the separator comprises a substantially circular,

fiat rockable disc, the said two separating fingers at its periphery, and between the latter the radially directed separating arm, the disc on its front side being provided with a conically pointed central peg.

4. A device as claimed in claim 1, wherein the radial separating arm is tapered towards the periphery of the disc, and the latter is built symmetrical with respect to the central plane of the separating arm.- 1

5. A device as claimed in claim 1, wherein the two separating fingers and the separating arm terminate in points intermediate of the front and the rear side of the said disc.

6. A device as claimed in claim 1, wherein the separator comprises a substantially circular, flat rockable disc, and a conically pointed central peg integral with the front side of the latter;

the said conical point of the peg forming a continuation of a cylindrical surface thereof.

7. A device as claimed in claim 1, wherein the axis of rotation of the separator lies between the two lease bars provided for the warp and parallel to them, but outside the crossing point of the two groups of warp threads, so that the said central peg is capable of bearing against the warp threads of both groups.

8. A device as claimed in claim 1, wherein the separator comprises a substantially circular, fiat rockable disc, and a conically pointed central peg integral with the front side of the latter; the said conical point of the peg forming a continuation of a'cylindrical surface thereof, and the said peg being integral with the driving shaft of the disc.

HEINRICH MEIER.

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