DE2257839A1 - DEVICE FOR CLAMPING AND SEPARATING WEFT FEET - Google Patents

Description

Dr.-Ing. Diploma Phys. OSKkR K0 NTG FeHntanwaU

. 1257039

■ Deutsche Bank AG Stuttgart

Telephone: (071Ϊ) 62 65 61 ■; - Account No. 89 / DO 301

Telegram: Koenigpat? O00 STÜTTGABT-Ϊ, Kiapfelstrasse «. ; . Postal check S! Gt, 64919

Postiadi 51 '■' - ".

3238

LEBOCEY INDUSTRY

TROYES / France

Device for clamping and severing weft threads

The invention relates to a device for clamping and severing of weft threads of a shuttle-less weaving machine., with two cutting links for severing a weft thread and two clamping means for clamping the weft thread.

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In the present description and claims is with Weavers always referred to as a shuttle of a loom who carries a weft bobbin. With a shuttleless loom is therefore any type of weaving machine that has no shuttle that carry weft bobbins. The invention therefore does not relate to such weaving machines with shuttle guards carrying weft bobbins, but on weaving machines in which the weft thread or threads by means of rapier shuttles, Harpoons, moving grippers or the like are moved through the shed, the weft thread or threads can be drawn off from the outer bobbins arranged on the side of the weaving machine. The invention is preferably for weaving machines provided in which each weft thread through a weft carrier provided at its ends with grippers, in particular a projectile is passed through the shed.

It is a purpose of the invention to provide an improved device which is capable of engaging in shuttle-less looms (Clamping) and the severing of the weft thread allows until the gripped (clamped) thread again from the weft carrier the loom is taken over in order to bring it into the shed by a movement in the same direction.

According to the invention, the device mentioned at the beginning is used in a device Kind provided that the two clamping means have cooperating clamping surfaces in order to clamp a weft thread, wherein these two clamping surfaces are movable.

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It can preferably be provided that the Klerranflachen

clamp the weft thread in a position approximately parallel to the path of this weft thread.

Furthermore, it can expediently be provided that the clamping surfaces have mutually complementary bumps.

In a particularly advantageous development, "is provided, that the clamping surface of one of the two clamping members z \ «7ischen is elastic or resilient in two extreme positions.

The device according to the invention is preferably designed in such a way that that it enables an approximately constant clamping force to be exerted on a large clamping surface without To damage the end of the weft thread, for example to crush it, this clamping process preferably being carried out takes place approximately the same height as the height of the normal path of the weft thread as it passes through the shed corresponds, so that no excessive lateral displacement of the weft thread between its run-off position and his Position during the clamping and separating process.

In the drawing is an embodiment of the invention shown, it being understood that the invention can be practiced in numerous other embodiments. It show: · ■

1 shows a side view of a device according to the invention,

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Fig. 2 is a plan view of the device of

Fig. 1, with the cutting members removed and the clamping members in closed position Position are shown,

FIG. 3 shows a partial view of FIG. 2 with the open

Gripping links,

4, 5 and 6 are sketches in which the gripping and cutting devices are shown in the open position, during the closing process and in the closed position.

The device enables the weft thread of a weaving machine to be grasped and severed until the thread is gripped again from the weft carrier of the loom when moving in the same direction for the passage of a new weft is taken over.

If the invention, as preferably provided, relates to a loom in which the weft threads by means of the same Weft carrier, preferably a hook protection, a harpoon or the like, into the shed from both sides are entered, then two devices according to the invention for gripping are on such a loom and severing the weft threads in a similar design, these two devices laterally next to the web, near the end position area 2des Shot carrier are arranged.

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In particular, a device according to the invention should make it possible to ensure effective clamping and exact severing of the weft thread, regardless of what type of weft thread is, what diameter it has, how its twist
(Twist, twist), etc., without this device requiring precise and therefore delicate adjustment or adjustment, as is the case with the known devices of this type
necessary is.-

The device shown in the drawing has a support which is attached, for example, to the slack of the weaving machine and carries an axis 2, which is guided in a straight line and which carries two each
Clamping members 3 and 4 forming clamping means, which cause the weft thread to be clamped, as well as two cutting members (cutting blades) 5 and 6, which carry out the severing of the weft thread that has just been gripped, is stored.

These parts 3, 4, 5 and 6, which are pivotably mounted on the common axis 2, are pressed against one another by means of the spring 7, which exerts a pull on the axis 2. The two clamping members 3 and 4, which can also be referred to as clamping members,
have clamping or tensioning surfaces 3 and 4, which are expediently arranged parallel to the weft yarn 8, so that they after
After pivoting about the axis 2, clamp the weft thread 8 parallel to its path resulting from its passage through the shed, that is, without causing significant deformation of the thread, which could prevent the thread from being securely gripped by one of the grippers of the weft carrier would.

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In addition, as described below, one of the two Clamping members (clamping member 4) controlled elastically or resiliently so that the parallel to the firing path of the Weft thread taking place clamping of the thread accomplished with approximately constant force without the risk of squeezing the thread no matter what type of thread is and what diameter or what twist it has. In not illustrated manner, the clamping of the thread could also be achieved in such a way that the clamping member 4 by a elastic or resilient, stationary means or member made of natural or synthetic material is replaced without that therefore the scope of the invention is left.

The device according to the invention also enables large To achieve clamping surfaces (clamping surfaces), the optimal Ensure clamping process, the clamping surfaces / n it special Advantageously, one or more mutually complementary deformations (unevenness) can have, whereby a optimal clamping of the weft thread is achieved.

In this embodiment, the deformations are complementary by a projection of triangular cross-section 9_ of the clamping surface 4 of the clamping member 4 and a koir.plementary to this Groove 9 of the clamping surface 3 of the clamping member 3 is formed.

The clamping members 3 and 4 and the cutting members 5 and 6 are simultaneously by means of pin-like projections (pins) 9 and 10 actuated, which are arranged at the end of an arm 11 pivotably mounted at 12. This arm 11 is at the time, too

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which the slack of the loom arrives in the stop position of a weft yarn, through the one shown schematically at 13 The stop is pivoted in a controlled manner, which rests against the end of the arm 11 in order to pivot it in the direction of the arrow F. In FIG. 2, the arm 11 has already carried out the pivoting caused by the stop 13.

The projections or pins 9 and 10 engage in recesses the clamping members 3 and 4 and the cutting members 5 and 6 a. These recesses in the cutting members 5, 6 correspond to Recess of the clerical member 3. As can be seen particularly clearly from FIGS. 3 and 4, those provided for the pin 9 are Recess of the clamping member 3 and, accordingly, the recesses of the two cutting members 5 and 6 for the Pin 9 or the pin 10 taken so that these pins 9, 10 in the pivoting direction of the arm 11 with practically no play in this Engage recesses and so a positive connection between these pins 9, 10 and the recesses mentioned of parts 3, 5 and 6. The clamping member 3 and the two cutting members 5 and 6 are consequently supported by the arm 11 positively controlled. In contrast to this, a recess 14 is provided in the clamping member for the pin 10, which in the pivoting direction of the arm is much wider than the diameter of the pin 10 corresponds. The clamping member 4 is constantly in Closing direction spring-loaded by a leaf spring 15, which at 16 allows its bias to be adjusted Screw regulator 17 is held.

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As a result, the control of parts 3, 5 and 6 is positive, while the control of the part 4 is negative and resilient because the pin IO the pivoting of the clamping member 4 only under Action of the leaf spring 15 allows. The recess 14 is designed in this way

that in the closed position of the clamping members 3, 4, the pressing force of the clamping surface 4. of the clamping member 4 on the The clamping surface 3 of the clamping member 3 is determined by the torque exerted by the leaf spring 15 on the clamping member 4, wherein the play between pin 10 and clamping member 4 is so great that the clamping force of the closed clamping device is approximately constant in all positions.

As can be seen from FIG. 4, when the clamping members are in the open position, the surface 4 of the clamping member is located in a higher position than the adjacent cutting surface of the cutting member 6, this position being defined by the position of the pin 10 is determined, on which the clamping member 4 rests in its open position under the action of the leaf spring 15.

So act when the arm 11 pivots in the direction of arrow F, the pins 9 and 10 simultaneously on the parts 3, 4, 5 and 6 until the weft thread 8 is parallel to its longitudinal direction is gripped (see Fig. 5). At the point in time when the weft thread 8 is clamped between the clamping members 3 and 4, the cutting edges of the cutting members 5 and 6 have not yet come into contact with one another. The pivoting movement of the arm

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and thus the pins 9 and 10 continue to see and now only determine the movement of the clamping member 3 and the cutting members 5 and 6, and that will continue to move of the clamping member 4 from the time v / o it to the clamping member 3 arrives, no longer determined by the movement of the pin 10, since this pin 10 is now related to the on Fig. 3 right end of the recess 14 is advanced in the clockwise direction and also the clamping member 4 by the counterclockwise direction subsequent movement of the clamping member 3 is moved back against the action of the leaf spring 15.

In the course of this movement, the weft thread clamping force remains the clamping device essentially constant when the two cutting members 5 and 6 sever the weft thread (Fig. 6). From this Fig. 6 it can be seen that the clamping member 3 on its side adjacent to the cutting member 6 is provided with a recess 3. which enables the parts 3, 5 and 6 to to lie against each other without causing permanent deformation of the weft thread.

When the drawer moves backwards again and the stop 13 leaves the arm 11, the arm 11 remains due to the springs 18 arranged on the pivot axis 12 of the arm 11 and the resulting friction in the closed position, i.e. in the angular position in which parts 3, 4, 5 and 6 are in the position shown in FIG. 6.

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As a result, the severed end of the weft yarn remains gripped by the clamping members or clamping jaws 3 and 4 until the moment when the weft carrier, when it returns in the opposite direction, picks up the thread clamped for this purpose with its rear looper.

In the extreme rear position of the drawer, the arm 11 comes to a stop, by means of which it is moved into the position in which the cutting members 5, 6 and the clamping members 3, 4 are open (Fig. 3).

When the shot bearer

alternating weft threads from the left

pulls right and left through the shed, it only comes back to the side of the loom with the next but one beating process, on which the device shown is located (as mentioned, there is also a corresponding one on the other side of the loom Device arranged). It is therefore provided in a manner not shown that the stop 13 is in each case a stop process of two successive stop processes (Hitting the weft yarn on the fabric) withdrawn, so that the lever 11 thus only in each case second stop process is brought into cutting and thread clamping position.

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Let it be "stated that the opening of the small members 3, according to what is described and can be seen from the drawing The device does not function until the cutting members 5 and 6 have opened, i.e. when the The clamping surface 4 is already in a higher position than the cutting surface of the adjacent cutting member 6 (Fig. 5). This is particularly useful.

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Claims (10)

3238 - 12 - Claims >'ly device for clamping and severing weft threads of a shuttle-free weaving machine, with two cutting members for severing a weft thread and two clamping means for clamping the weft thread, characterized in that the two gill means (3, 4) have interacting clamping surfaces (3, 4) to clamp a weft thread, these two clamping surfaces being movable. 2. Apparatus according to claim 1, characterized in that the clamping surfaces (3, 4) the weft thread in one to the weft path clamp this weft thread approximately parallel position. 3. Device according to claim 1 or 2, characterized in that the clamping surfaces (3, 4) unevenness that are complementary to one another (9, 9.) have. 4. Device according to one of the preceding claims, characterized in that the clamping surface (4.) is one of the two Clamping members (4) is elastic or resilient between two extreme positions. - 13 - 309823/078 / » 3238 - 13 - 5. Apparatus according to claim 4, characterized in that the Kiemmflache (4) on the one hand at a higher level than that of the cutting edge of one of the cutting members (6) and on the other hand at Cutting through the weft thread is located at a lower level than the cutting edge of this cutting link. 6 «Device according to one of the preceding claims, characterized characterized in that the two cutting members (5, 6) and the both gill means (3, 4) are movable, the two Cutting links (5, 6) and one of the two clamping means (3) are positively controlled and the other clamping means (4); negative is controlled ... 7. Device according to one of the preceding claims, characterized characterized in that the two clamping means (3, 4) are pivotable are arranged on an axis (2). 8. Device · according to one of the preceding claims, characterized characterized in that the two cutting members (-5, 6) and the two clamping means (3, 4) during the displacement by projections (9, 10) or the like are controlled in recesses of the cutting members and the clamping means engage, the Connection between one of these projections (10) and one of the both clamping means (4) takes place with play in the direction of movement, this clamping means (4) being constantly supported by spring means (15) is spring-loaded, which act on it in a direction that they try to hit the clamping surface (4,) of this gill means (4) at a higher level than the cutting edge of either of the two To hold cutting links (6). SO 9 82 3/0 764 - 14 - 3238 - 14 - 9. Device according to one of the preceding claims, characterized in that the control of the cutting members and Clamping means serving projections or the like (9, 10) are arranged at the end of a pivotable arm (11). 10. Device according to one of the preceding claims, characterized characterized in that two of the control of the clamping means and Cutting members serving projections or the like (9, 10) are provided ^ each of which with a cutting member and a gill agent interacts. 309823 / Q764